91results about How to "Smooth cushioning" patented technology

A buffer device for a super-heavy-load structural parts tensile tester comprises a clamp (2), a main clamp head (3), an auxiliary clamp head (4), a displacement sensor (5), buffer bars (6), buffer retainer rings (7), loading cylinders (8), guide rails (9), force sensors (10), hydraulic buffer cylinder bases (11), hydraulic buffer cylinders (12), springs (13), a return cylinder (14), buffer cylinder pistons (15), and buffer cylinder barrels (16). The hydraulic buffer cylinders and the springs are in two-stage series connection for buffering, impact energy of the clamp heads and the clamp is largely converted into heat energy for liquid in the hydraulic cylinders, the heat is dissipated by air, and small part of the heat energy is converted into deforming potential of the springs. In addition, the springs serve as a return buffer system. Adjustment buffer time is larger than or equal to critical buffer time, so that the hydraulic buffer cylinders are imparted with fine buffering action. The buffer device is reasonable in design, stable in buffering, convenient to control, and high in reliability.

The invention discloses a buffer using magneto-rheological cement gum. The buffer comprises a main body unit and a support unit for supporting the main body unit, wherein the main body unit comprises a cylinder block, a lower cover, an upper cover, a piston, a magnetic field device, a coil and the magneto-rheological cement gum; the upper cover and the lower cover are fixedly connected with the upper and lower ends of the cylinder block respectively in order to form a sealed accommodating space; the lower cover is fixedly connected with a support part; the middles of the upper cover and the lower cover are provided with a cover hole respectively; a piston is arranged between the two cover holes; a gap is formed between the piston and the inner wall of the cylinder block; the magnetic field device is fixed on a part, which is arranged in the accommodating space, of the piston; the magnetic field device is wound with the coil along a single direction; the accommodating space is filled with the magneto-rheological cement gum. By adopting the buffer, the buffer force and buffer capacity can be adjusted in a semi-active way, and the stability of the buffer force is improved. Meanwhile, the used magneto-rheological cement gum particles are prevented from settling, the buffer can work for a long time, and the sealing requirement is relatively low.

The invention discloses a rotation control valve, a rotation control system and a crane, and relates to the technical field of engineering machinery. The rotation control valve, the rotation control system and the crane solve the technical problem that system reliability is poor in the prior art. The rotation control system comprises a first valve, a second valve and a third valve, wherein when the second valve is at a first state, the first valve is communicated with an oil tank through a first oil passage; when the second valve is at a second state, the first valve is communicated with the third valve through a second oil passage; when the third valve is at a conducting state, the third valve is respectively communicated with the second oil passage of the second valve, a first main oil circuit port and a second main oil circuit port; and when the third valve is at an off state, oil circuits of the third valve respectively communicated with the second oil passage of the second valve, the first main oil circuit port and the second main oil circuit port are cut off. The rotation control system and the crane both comprise the rotation control valve. According to the rotation control valve, the rotation control system and the crane, reliability of the rotation control system is improved.

The invention relates to a buffer system for impact ground pressure resisting of a hydraulic support, and application thereof. The buffer system comprises a vertical column. The vertical column comprises a movable column, a middle oil cylinder, a bottom oil cylinder and an anti-impact buffer which are sequentially connected. The anti-impact buffer is provided with a pressure sensor and a controller which are connected. The controller is further electrically connected with a magnetorheological coil in the anti-impact buffer. Pressure information is collected by the pressure sensor, the currentof the magnetorheological coil is adjusted in real time and connected and disconnected by the controller, and thus the impact ground pressure applied to the vertical column is buffered by the anti-impact buffer in an assisted mode. The buffer system for impact ground pressure resisting can be conveniently integrated on an existing hydraulic support structure and is conveniently mounted to be matched with the existing hydraulic support for using; and the traditional single mode of pressure relieving through a large-flow safety valve is changed, after the buffer system is adopted, the buffer pressure relieving process of the vertical column can be effectively protected, meanwhile, reliability during impact ground pressure resisting of the hydraulic support is improved, and it is ensured thatthe hydraulic support works safely and effectively.

The invention discloses a reusable angle-changing length-changing self-adaptation buffering landing mechanism. The reusable angle-changing length-changing self-adaptation buffering landing mechanism comprises a landing leg, a ball hinge, a power device and a swing driving mechanism body which is matched with the power device to drive the landing leg to swing relative to the center of the ball hinge so as to change the angle; the landing leg comprises a leg main body and a rotary type magneto-rheological damper, and the leg main body comprises a main cylinder tube and a lead screw rod, wherein the main cylinder tube is matched with the ball hinge in the mode that the main cylinder tube can rotate around the axis of the main cylinder tube, the lead screw rod is sleeved with the main cylinder tube, the lead screw rod and the main cylinder tube form a lead screw nut pair so as to be used for changing the length, and the upper end of the main cylinder tube is in transmission connection with the rotary type magneto-rheological damper; the swing driving mechanism body comprises an arc-shaped tooth frame fixedly arranged on a lander and a swing driving tooth matched with the arc-shaped tooth frame in an engaged mode and driven to rotate by the power device; and according to the reusable angle-changing length-changing self-adaptation buffering landing mechanism, multi-aspect factors such as the buffering effect, the structural weight and reusability are balanced, and the reusable angle-changing length-changing self-adaptation buffering landing mechanism is greatly suitable for a reusable carrying device.

The invention discloses a buffer device for a composite damping force of an elevator. The buffer device comprises a buffer component and a magneto-rheological damping component which can be connected with the buffer component in a forward direction and a reverse direction and forms damping. By combining variable forward damping intervention at the later buffer stage of abnormal falling of an elevator car with elastic buffer at the earlier stage, the buffer device disclosed by the invention is suitable for high-speed elevators, and has an effect of being dynamically applied at any time, so that the comfortability and the reliability before the elevator car touches the bottom and at the moment when the elevator car touches the buffer component are effectively improved; meanwhile, before the buffer when the car touches the bottom is finished, the connection of the damping component is restored to play a role in limiting the speed of resilience, and steady resilience is ensured; parameters of magneto-rheological fluid are adjusted according to falling parameters of the elevator car, and if the falling speed is high, a bigger resilience force can be caused, and the power-on current of the magneto-rheological fluid is intensified so as to increase the restored damping force; meanwhile, during damping restoration, the viscosity of the magneto-rheological fluid can also be adjusted so as to ensure the resilience to be steady and slow.

The invention belongs to the field of chemical engineering, and aims to provide a process and a device for continuously producing a high-quality N-fatty acyl amino acid salt surfactant, which increasean acyl chloride conversion rate and reduces the content of sodium aliphatate. According to the technical scheme adopted by the invention, the process for continuously producing the high-quality N-fatty acyl amino acid salt surfactant comprises the following steps: (1) separately introducing a reaction material amino acid mixture, acyl chloride, liquid alkaline and circulating recycling materialsinto a mixing device to uniformly mix; (2) cooling the uniformly mixed materials through a heat exchanger, conveying the materials into an amidation post with an overflow hole from the bottom by utilizing a conveying pump, and performing amidation reaction at a proper temperature with a proper pH value; (3) enabling an amidation product to overflow from the overflow hole of the amidation post, introducing one part of the amidation product used as the circulating recycling materials into the mixing device to perform circulating reaction, and heating the other part of the amidation product through a heater, and introducing the heated materials into an ageing machine to perform ageing reaction; and (4) obtaining an aged reaction product, namely a target product N-fatty acyl amino acid salt.

The invention provides a new energy automobile battery box, which can effectively solve the problems of battery fixation and energy absorption in an emergency state; the solved technical scheme is asfollows: the new energy automobile battery box comprises a first rectangular box, a second rectangular box is arranged in the rectangular box, a third rectangular box is arranged in the second rectangular box, vertical plates are arranged on the surroundings of the third rectangular box, a longitudinal plate is arranged at one end of each vertical plate, the longitudinal plate and the vertical plate form an L-shaped plate, the third rectangular box and the second rectangular box are provided with pressure springs, a rectangular block is arranged between two third rectangular boxes, latch pinsare uniformly distributed on the rectangular block, a cylinder is arranged on the third rectangular box, vertical plates are arranged on the left and right sides of the rectangular block, connecting rods are arranged on the front and back sides of the vertical plates, and the other ends of the connecting rods are hinged with the vertical plates in the corresponding L-shaped plates; and the new energy automobile battery box provided by the invention are smart in structure and are simple and easy to use, solves the problem of conflict between the fixing and buffering of a battery, and realizes the fixing of the battery when the stress is relatively small and the buffering of the battery when the stress is relatively large, the buffering process is stable, large and small impacts can be effectively buffered, so that the safety of the battery is greatly ensured, and accordingly, the new energy automobile battery box is safe and reliable.

A retractable-airfoil vessel has surface-effect wings (1) that are hinged or otherwise attached extendedly to a vessel (3). The surface-effect wings are extendable to a use mode in proximity to a surface of water (5) at sides (2) of the vessel for surface-effect lift of the vessel at elevated speeds. At low speeds when pleasure cruising or fishing, when stopped for water activities or when adjusting to rough waters and storm conditions, the surface-effect wings can provide wide-area buoyance on water at sides of a center of gravity of the vessel. The best of all worlds, it can be made to ride-out a storm as safely and securely as an anchored buoy and yet have high-speed efficiency, low-speed pleasure cruising and stopping for swimming and marine exploration. Then for docking in vessel slips and for maneuvering in close proximity to docks and harbor structures, the surface-effect wings can be retracted onto the vessel in a non-use mode for non-interference storage and for docked-living shelter.

The invention provides a buffering device of an undercarriage buffering support, and an application method of the buffering device to an oil-gas buffering support. The buffering support comprises an outer barrel and an inner barrel capable of moving along the inner wall of the outer barrel; the buffering device comprises at least one excitation part, at least one induction part, a control unit and a sensing part, wherein the at least one excitation part is distributed on the inner side of an outer barrel wall of the buffering support; the at least one induction part is distributed in the inner barrel of the buffering support and is used for responding excitation of the corresponding excitation, so that the inner barrel moves along the outer barrel of the buffering support to generate buffering damping; the control unit is used for controlling the excitation part in real time according to a movement signal of the buffering support; and the sensing part is distributed at the lower end of the buffering support and is used for detecting the movement signal of the buffering support and feeding the movement signal back to the control unit. According to the buffering device of the undercarriage buffering support, a relatively complicated outer condition is adapted according to a semi-automatic control manner and the airplane landing buffering efficiency is improved; and the safety and the comfort of an airplane landing process can be further increased by using a good control algorithm.

The invention relates to a buffer hinge suitable for a thick door plate. The buffer hinge comprises a hinge cup, a first connecting rod, a second connecting rod, a first torsion spring, a buffer and ahinge arm, and further comprises a connector, wherein the second connecting rod comprises a first connecting part and a rotary part which are sequentially connected; the hinge arm comprises a secondconnecting part and an arm body which are sequentially connected; the lower end of the first connecting rod and the lower end of the first connecting part are co-hinged with the hinge cup through a U-shaped pin; the upper end of the first connecting rod is hinged with the second connecting part; the middle part of the rotary part is hinged with the hinge arm through a rotary shaft; the tail end ofthe rotary shaft is hinged with the front end of the connector through a hinge pin; the tail end of the connector is hinged with a telescopic end of the buffer; the tail end of the buffer is connected with the arm body; and the first torsion arm is hinged with the arm body, and the rotary arm at the tail end of the first torsion spring abuts against the top of the inner wall of the arm body. Thefirst torsion spring backwards moves into the arm body, so that the second connecting part of the hinge arm is designed to be as long as possible and sufficiently high, and the hinge arm is preventedfrom generating interference with the thick door plate, and therefore, the hinge is more suitable for the thick door plate.

The invention relates to a buffer which comprises a mounting bottom plate with a bolt mounting hole. The buffer is characterized in that at least three wrapped connecting skeletons are punched on the mounting bottom plate; the mounting bottom plate is connected with a polyurethane buffering column body through the connecting skeletons; and the connecting skeletons are inserted in the polyurethane buffering column body. The connecting skeletons are arranged by the punching method, therefore the rigid connection index between the mounting bottom plate and the connecting main body is decreased, and the protection function is effectively performed; as the connecting skeletons are not welded on the mounting bottom plate, the pollution to the environment is decreased in the manufacturing process. The connecting skeleton has the advantages of simple structure, material saving and decrease of manufacturing cost. The invention also has the advantages of strong anti-shock capability, stable buffering, corrosion and aging resistance, long service life, safety and reliability, and the like.

The invention provides a controllable damper and a hinge structure easy and convenient to assemble. A damper and a damping fixing seat are arranged in a main fixed seat. The inner two sides of the main fixing seat are provided with a set of locating holes allowing locating protrusion parts on the two sides of the bottom edge of the damper fixing seat to be inlaid in. At the end of the main fixed seat, a first pivot penetrates through a first pivoting hole of a first connecting arm. On the inner side of the front end of the main fixed seat, a second pivot penetrates through a pivoting hole usedfor a rotary shaft on a second connecting arm to be pivoted to the end of the main fixed seat. The second connecting arm is provided with a swing end and a driving end. The swing end and the drivingend of the second connecting arm are each provided with a set of pivoting holes. A U-shaped pivot penetrates through the pivoting holes of the first connecting arm and the second connecting arm to bepivoted to a door sheet locking and fixing seat. Moreover, the front end of the main fixed seat is provided with a damper control unit. The damper control unit can be used for controlling whether thedamper achieves the damping effect or not so as to control whether opening and closing of a cabinet door sheet are limited by the damper.

The invention discloses a buffer mechanism for electromechanical equipment maintenance, and relates to the technical field of electromechanical equipment maintenance. The buffer mechanism comprises a base; two support rods are fixedly connected to the upper surface of the base; the top ends of the support rods penetrate through first through holes formed in the upper surface of a fixed plate, and are fixedly connected with the bottom end of an extension device; the top end of the extension device is fixedly connected with the upper surface of the inner wall of a second shell; the lower surface of the second shell is joined with the upper surface of the fixed plate; and the lower surface of the fixed plate is fixedly connected with the top end of a second spring. Through coaction of a second movable rod, a rotating shaft, a thread column, a thread cap, a connecting rod, an extrusion plate, a movable plate, a slide rod, a slide sleeve and a third spring, the buffer mechanism for electromechanical equipment maintenance realizes the vibration amplitude adjustment of the second spring, so that the process of adjusting the buffer mechanism of electromechanical equipment according to actual conditions is realized, and the maintenance of the electromechanical equipment is guaranteed.

The invention relates to the technical field of casting processing equipment, and discloses an adjustable burr grinding device for a highly wear-resistant casting. The adjustable burr grinding devicecomprises a base, wherein an inner slot is formed inside the base; the slot bottom of the inner slot is fixedly connected with a telescopic spring; the top end of the telescopic spring is fixedly connected with a balance plate; the upper surface of the balance plate is fixedly connected with a supporting rod; and the top end of the supporting rod gets out of the inner slot and is fixedly connectedwith the lower surface of a device body. According to the adjustable burr grinding device for the highly wear-resistant casting disclosed by the invention, a first positive and negative rotation motor, a second positive and negative rotation motor, a second threaded rod and a first threaded rod are arranged, the second positive and negative rotation motor is started, and a threaded sleeve is blocked by a guide slot, so that the threaded sleeve moves up and down along the second threaded rod; when a grinding disc is in contact with an alloy casting, the first positive and negative rotation motor is started and the movable block moves along the first threaded rod, so that left-right regulation is performed, use is convenient and applicability is strong; and the adjustable burr grinding device can be suitable for alloy castings of various specifications, and is more convenient in use.

The invention discloses a multi-groove oil buffer. The multi-groove oil buffer comprises a shell, a cylinder block and a plunger, wherein the cylinder block and the plunger are located inside the shell, one end of the cylinder block is connected to an oil cylinder base, and the plunger is inserted into the other end of the cylinder block; buffer oil is arranged in a cylindrical cavity defined by the cylinder block and the plunger, oil grooves are formed in the end, in contact with the buffer oil, of the plunger, and the oil grooves are arranged in order by height; the cylinder block and the plunger are sleeved with a reset spring, and a limiting baffle is arranged on the middle section of the plunger. An elevator can be buffered at an approximately constant speed under the damping action of fluid, and the advantage of stable buffering is realized. Under the same condition, the stroke required by the multi-groove oil buffer is half that of a spring buffer. The multi-groove oil buffer is especially suitable for high-speed elevators.

The invention discloses a pushing mechanism with an auxiliary pushing function for a feeding device, and relates to the technical field of feeding devices. The pushing mechanism with the auxiliary pushing function for the feeding device comprises a charging tank and a adjusting mechanism, wherein a hydraulic oil cylinder is installed at the front end of the charging tank; a telescopic pipe is arranged above the hydraulic oil cylinder, and a supporting column is arranged at the front end of the hydraulic oil cylinder; a buffering mechanism is arranged inside the supporting column, wherein a sliding block is arranged above the buffering mechanism; and a balancing mechanism is arranged above the supporting column, wherein a hopper is arranged above the balancing mechanism, and an auxiliary pushing mechanism is arranged inside the hopper. The pushing mechanism with the auxiliary pushing function for the feeding device is provided with the auxiliary pushing mechanism; and under the action of a small hydraulic oil cylinder, a pushing bucket is pushed to rotate along the outside of a shaft pin, so that materials incline out of the pushing bucket, are poured into the feeding port and are prevented from being adhered to the interior of the pushing bucket.

The invention provides a buffer, which comprises a base used for fixing the buffer and a check block used for bearing impact force, wherein a mandrel is arranged on the middle part of the base; an elastic element is arranged between one side, which is provided with the mandrel, of the base and the check block; an elastic element support sleeve is arranged on the periphery of the elastic element; an end cover used for limiting the check block is arranged at the joint of the elastic element support sleeve and the check block; the end cover and the elastic element support sleeve are fixed on the base through bolts. According to the buffer, the defect of large axial size of the conventional buffer is overcome, the phenomena of large-amplitude rebounding and jumping in a buffering process are avoided while huge impact force can be borne, and high buffering stability and high practicability are realized.

The invention discloses a vehicle bumper structure capable of being heated and repaired. The vehicle bumper structure capable of being heated and repaired comprises a bumper body and a cross beam, wherein the cross beam is a straight beam, longitudinal beams are respectively arranged at the two ends of the cross beam, the longitudinal beams are straight beams, the lower ends of the longitudinal beams are connected with the cross beam, the upper ends of the longitudinal beams are connected with the bumper body, intermediate beams are arranged at the middle parts of the longitudinal beams, the intermediate beams are also straight beams and are fixedly arranged at the middle parts of the longitudinal beams by virtue of fixing bolts, the bumper body is arc-shaped, the two ends of the bumper body are fixedly connected to the longitudinal beams by virtue of a buffer block, a plurality of strong springs are also arranged between the bumper body and the intermediate beams, one end of each strong spring is fixedly connected with the bumper body, and the other end of each strong spring is fixedly connected with the corresponding intermediate beam. The vehicle bumper structure capable of being heated and repaired has the advantages that the problem that the bumper is replaced after generating plastic deformation due to impact is solved, impact resistance of the bumper is improved by optimizing the vehicle bumper structure capable of being heated and repaired, corrosion resistance of the bumper is enhanced, and the aim of prolonging service life of the vehicle bumper structure capable of being heated and repaired is achieved.

The invention discloses a multi-stage buffer for an elevator, and relates to the technical field of buffer devices of elevator cars. The multi-stage buffer for the elevator comprises a bottom plate, wherein the upper end face of the bottom plate is provided with a one-stage buffer assembly, a two-stage buffer assembly, a conversion assembly; the one-stage buffer assembly comprises a main cylinderseat, a plurality of oil outlets are formed in the bottom end of the main cylinder seat, a main plunger is arranged in the top end of the main cylinder seat in a vertical and sliding mode, and one end, facing to the main cylinder seat, of the main plunger is provided with a throttle; the two-stage buffer assembly comprises a plurality of minor cylinder seats, the bottom ends of the minor cylinderseats are provided with oil inlets, and minor plungers are arranged in the top end of the minor cylinder seats in a vertical and sliding mode; and the conversion assembly comprises a conversion seat connected to oil outlets and oil inlets, and a one-way valve and a direct current channel are arranged in the conversion seat in a staggered mode. When the car falls, the one-stage buffer assembly andthe two-stage buffer assembly play a buffering role one after another. According to the multi-stage buffer, the overall buffer ability is improved, and the supporting to the car is more stable; and the overall height is low, the movement distance is short, the installation is convenient, the linkage buffering effect is good, and the adaptability to a bottom pit of a well path is stronger.

The invention provides a buffering mechanism used in a mask ear-loop tensioning device, and belongs to the technical field of machines. The problem is solved that the stability is poor in the prior art. The buffering mechanism in the mask ear-loop tensioning device is located on the inner side of a push cylinder and comprises a swing rod, a buffering cylinder, a limiting rod and a buffering assembly. An indent connecting base is arranged on the inner side of the push cylinder; the inner end of the swing rod is hinged into the connecting base; the outer end of the swing rod stretches out of theinner side of the push cylinder; and the buffering cylinder is fixedly connected to the middle of the swing rod. The limiting rod is fixedly connected to the lower portion of the connecting base; thelower side of the buffering cylinder abuts against the limiting rod; the buffering assembly is connected to the upper portion of the connecting base; the buffering assembly trends to abut against theupper side of the buffering cylinder. The buffering mechanism used in the mask ear-loop tensioning device is high in stability.

The invention provides a traction device with the buffer function for a railway locomotive. The traction device comprises a traction block A, an air cylinder, a locking block, a traction block B, a traction block C, shock absorption grooves, a T-shaped block, a T-shaped groove, springs A, round nuts, shock absorbers, a spring B, a touching device A and a touching device B; the top portion of the traction block A is provided with the air cylinder through a bolt, the top portion of the air cylinder is provided with a magnetic plate structure in an integrated mode, and the external side of the magnetic plate structure is fixedly provided with the locking block through adsorption; the top portions of the neighboring edges of the traction block A and the traction block B are correspondingly provided with guiding inserted holes, and the locking block is arranged in the guiding inserted hole of the top portion of the traction block A through the air cylinder; and through the arranged T-shaped block, the T-shaped groove and the shock absorbers, the stable and good buffer ability is provided for the traction device to buffer inertial impact force, and through dual arrangement and interlocking matching of the T-shaped block and the T-shaped groove, the buffered direction can be stable.

The invention discloses a calibration device for a microcirculation blood flow speed meter, and relates to the field of medical technology. The calibration device includes a storage plate, the upper surface of the storage plate is provided with a storage trough, a correction device main body is arranged in the storage trough, the left side surface and the right side surface of the storage plate are provided with storage troughs, and the upper and lower surfaces of the inner wall of every storage trough are provided with sliding grooves. Second springs, third springs, slide rods, slide sleeves,connecting rods and a bottom plate cooperate with each other, and when the device needs to be placed on a tabletop for use, the bottom plate firstly contact the tabletop, the storage plate continuously slowly contact the tabletop downwards, and the second springs and the third springs buffer the storage plate and the calibration device main body in order to prevent the calibration device main body from being strong vibrated, so certain service life and certain working accuracy of the calibration device main body are ensured.

The invention discloses a reducing damping type safe elevator system which comprises an elevator car body and a buffer assembly. The buffer assembly comprises a buffer component and a reducing damping component; the buffer component is used for preventing the elevator car body from striking the bottom rigidly; the reducing damping component comprises a cylinder body, a damping piston and a piston rod which is fixedly connected with the damping piston, the piston rod and the buffer component are jointed in the stroke that the buffer component is compressed by the elevator car body and rebounded, and reducing damping is formed by the damping piston for the buffer component. According to the reducing damping type safe elevator system, the joint of the reducing damping component is used for restricting the speed of the rebound before the buffer of striking the bottom of a car is finished, due to the fact that the reducing damping component exists, and the buffer stroke and the elasticity coefficient of the buffer component can be increased, so that the buffer can be achieved more gently, quick rebound can be avoided through using reducing damping after the buffer, and the final buffer effect is guaranteed; accidents caused by secondary bounces due to larger elasticity coefficient of a buffer spring or longer compression stroke are avoided.

The invention relates to an electric vehicle battery pack cushioning device, which effectively solves the problem that the current electric vehicle battery cushioning device has bad effect. The technical solution includes an inner box and an outer box, the battery pack is placed in an inner box, A guide post is arranged on the inner box, the outer box is provided with a first blind hole which canbe matched with a guide post, A first piston is mounted in the first blind bore, the first blind hole is externally provided with a second blind hole in the direction of the first blind hole, A secondpiston is mounted in the second blind bore, the second piston is connected with a piston rod, the first blind hole is provided with an arc-shaped pressing piece, the piston rod is connected with thearc-shaped pressing piece, an oil passage is communicated between the first blind hole and the second blind hole, a plurality of exhaust holes with small apertures are arranged on the inner wall of the first blind hole between the first piston and the orifice, and gas in the first blind hole can be slowly discharged through the exhaust holes; The cushioning process of the invention is stable, andthe cushioning process can effectively cushion large and small impact, and the upper limit of the cushioning force is high, and the cushioning process is safe and reliable.

The invention discloses an indoor running trainer comprising a running platform cocked upwards at the front end, and a running belt is installed on the running platform; a motor in the running platform can drive the running belt to run; rollers are mounted on the two sides of the bottom of the tail end of the running platform; a horizontal hard platform pad is arranged below the running platform,and the rollers are in rolling fit with the hard platform pad; a front seat is fixedly arranged at the front end of the hard platform pad, the front seat comprises a left front seat and a right frontseat which are symmetrical left and right, and two vertical armrest frames are fixedly connected to the upper sides of the left front seat and the right front seat respectively; and the upper end of each armrest frame is fixedly connected with a handrail extending backwards. According to the indoor running training machine in the invention, the structure is simple, and the structure of a damping air chamber is adopted, so that the buffering process is more stable; the rebound process is more gentle; the vibration intensity is reduced; and meanwhile, part of the impact energy is used for continuously supplementing gas for an air bag, so that the blowing effect on a sports person is achieved.

The invention discloses a welding tool for full steel forging jack press machining and a press machining method, and relates to the technical field of jack press machining. The welding tool comprisesa base, positioning mechanisms and a clamping machine, wherein the external two sides of the base are fixed with connecting seats, a bottom plate is arranged below the base, an outer cover plate is mounted on the outer side between the base and the bottom plate, buffer springs are welded to the middle between the base and the bottom plate, and the positioning mechanism is mounted above the base. The welding tool has the beneficial effects that by arranging a motor and a rotating shaft, a fixing plate and a positioning shaft can be conveniently driven to rotate, and the clamping mechanism and apress welding piece clamped by the clamping mechanism are conveniently rotated, so that different positions of the press welding piece are conveniently welded; and the height of mounting plates, an upper frame body and the motor can be adjusted conveniently through electric push rods, and the height of the rotating shaft below the motor, the fixing plate and the clamping mechanism are conveniently driven to ascend and descend, so that the height of a press is conveniently driven to adjust.

The invention discloses a sealing structure of an irrigation and drainage device for aquaculture. The sealing structure comprises a shell, annular magnets with the same polarity are installed betweena movable ring base and a fixed piece, and a buffer space is formed between the movable ring base and the fixed piece through repulsive force by means of the principle that like poles repel each other. Due to the fact that repulsive force between the magnets can have a better buffering effect compared with elastic force of a spring, buffering is made smoother, and the space between the movable ring base and the fixed piece can ensure that under the action of the magnetic repulsive force, the pressure between a movable ring and a static ring is not too large through movement of the movable ringbase and the fixed piece in the space. On one hand, friction between the movable ring and the static ring is reduced, generated heat is reduced, and the working stability of the movable ring and thestatic ring is guaranteed; and on the other hand, the influence of liquid on the magnets in use is small, and the service life of a centrifugal pump is prolonged.