1595results about How to "Short trip" patented technology

This invention discloses methods and devices using ultrasound energy for resecting bone tissue during surgical procedures. The disclosure describes the use of ultrasound surgical saw consisting of an ultrasound generator, ultrasound transducer and ultrasound horn including a cutting blade to resect bone tissue without excessive temperature rise during typical surgical procedures. The cutting blade provides a self-clearing design that includes at least two teeth disposed to prevent accumulation of bone chips within the proximity of the teeth. The design of the cutting blade allows the mechanical motion of the blade and the emission of the ultrasound energy to remove accumulated bone chips and prevent excessive temperature rise.

This invention discloses methods and devices using ultrasound energy for resecting bone tissue during surgical procedures. The disclosure describes the use of ultrasound surgical saw consisting of an ultrasound generator, ultrasound transducer and ultrasound horn including a cutting blade to resect bone tissue without excessive temperature rise during typical surgical procedures. The cutting blade provides a self-clearing design that includes at least two teeth disposed to prevent accumulation of bone chips within the proximity of the teeth. The design of the cutting blade allows the mechanical motion of the blade and the emission of the ultrasound energy to remove accumulated bone chips and prevent excessive temperature rise.

The invention discloses a cooking utensil. The cooking utensil comprises a pot body, a pot cover, an exhaust valve and an automatic exhaust driving device; the pot body comprises a pot shell and an inner pot arranged on the pot shell; the pot cover is detachably arranged on the pot body, the exhaust valve is movably arranged in an exhaust channel, the automatic exhaust driving device comprises anelectric driving unit, an exhaust push rod and a connecting component, the electric driving unit is arranged on the pot body, the exhaust push rod can be horizontally movably arranged in the pot shell, one end of the exhaust push rod is suitable for abutting against the peripheral wall of the exhaust valve so as to push the exhaust valve to move, the electric driving unit comprises a driving rod capable of doing reciprocating, a first magnetic material part is arranged on the driving rod, the exhaust push rod can be horizontally movably arranged in the pot cover, a second magnetic material part is arranged on the connecting component, when the electric driving unit is triggered, the driving rod moves so as to make the first magnetic material part cooperate with the second magnetic materialpart so as to drive the connecting component to move. The cooking utensil has the automatic exhaust function and is high in reliability.

An electromagnetic driven membrane pump has a pump housing inside which at least one pump chamber (15) having at least one intake and outlet is formed and delimited between a gable (1) of the pump housing and at least one completely-sealed membrane (14) attached to a wall (4) of the pump housing and, in an axial direction of the pump housing, to a running axle (13) suspended in at least two separated suspensions in a longitudinal direction of the axle (13). At least one of the suspensions is composed of a flat spring (9) attached to the axle (13) in a radial direction out toward the wall (4) of the pump housing. The axle (13) is composed of magnetic material to be driven by a magnetic field from an electromagnet (7) for oscillation in its longitudinal direction and moving the membrane (14) in corresponding oscillating movement. The flat spring (9) is composed of an inner and at least one outer part, with the inner part attached to the axle (13) and the outer part(s) attached to the pump housing. These parts are connected with one another by two elastic legs, arranged at each side of the point where the spring is attached to the axle (13).

An exposure apparatus that comprises a stage (28) that moves in the X-axis direction, an X-axis linear motor (80) that drives the stage, a counter mass (30) that moves in a direction opposite to the stage due to the action of the reaction force of the drive force of the stage in the X-axis direction by the motor (80), X-axis trim motors (26A, 26B) that drives the counter mass in the X-axis direction, and a control unit that controls the trim motors and gives the counter mass an initial velocity in the +X direction when the stage is moved via the motor (80), for example, in the +X direction. Accordingly, the strokes required for the movement of the counter mass can be shortened without increasing the size of the counter mass.

The present invention discloses a composition method of a gantry four-dimensional automatic measurement platform for detecting photochromic performance of display screens and a gantry four-dimensional automatic measurement platform using the method. The present invention relates to the automatic measuring technology of the photochromic performance of display screens, and comprises a platform base, a gantry frame, an X-axis moving mechanism, a Y-axis moving mechanism, a Z-axis lifting mechanism, and a display screen-carrying rotating platform. By moving the mechanisms to control the circuit, the four-dimensional automatic measurement platform for detecting photochromic performance of display screens is flexibly controlled to accomplish the three-dimensional move of the photochromic measuring instrument and the accurate one-dimensional rotation of the display screen to be measured, the present invention is characterized in stable movement of the photochromic measuring instrument, small rotation radium of the display screen, novel structure, small driving power needed, small size, light weight, low cost, rapid measuring speed, high reliability and so on. The present invention can be widely applied to the photochromic automatic detecting system of LCD or LED television screen, display screen, or mobile phone screen and so on, and the present invention can precisely adjust the coordinate position of the test points and the angle of the display screen intelligently according to the detecting requirement of photochromic performance of the display screens under the computer management, and rapidly accomplish the detection of photochromic performance.

The invention relates to a material diversion mechanism, which is used in a material diversion system of a roller conveyer line and comprises a first conveying roller path (4), a second conveying roller path (1) and a path separation mechanism. An angle of 90 degrees is formed between the first conveying roller path (4) and the second conveying roller path (1). The path separation mechanism is arranged at the turning point of the first conveying roller path (4) and the second conveying roller path (1), is arranged under the first conveying roller path (4) and comprises a fixed seat body (11), a bearing seat body (13), a driving shaft (12), a driving sprocket (2), a driving belt pulley (3), a belt bearing body (14), a belt bearing wheel (5), connecting rods (8), a lifting cylinder (7), a tension adjusting cylinder (9) and a tension adjusting wheel (10), wherein the belt bearing body (14), the belt bearing wheel (5), the driving belt pulley (3) and a belt (6) form a belt conveyor unit, and the fixed seat body (11), the two groups of connecting rods (8) and the belt conveyor unit jointly form a parallelogram mechanism. The material diversion mechanism improves the material diversion efficiency and can protect materials against damages during diversion.

The invention relates to a switch type semi-active suspension system, which comprises four sets of switch type semi-active vibration absorbers, two acceleration sensors and a detection control system, wherein each two sets of the switch type semi-active vibration absorbers are arranged diagonally and act between a car body and a bogie; each set of switch type semi-active vibration absorbers respectively comprise a vibration absorber body A, high-speed switch valves A1 and A2, an adjustable damper valve A4 and a pressure sensor, wherein the high-speed switch valve A1 is used for communicating a rodless cavity with an oil storage cavity of the vibration absorber body; a check valve A3 is arranged between the oil storage cavity and the rodless cavity; the high-speed switch valve A2 is used for communicating the rodless cavity with a rod cavity; the adjustable damper valve A4 is arranged between the rod cavity and the oil storage cavity; and the pressure sensor is used for detecting the pressure of an oil way led out of the rod cavity of the vibration absorber body; and output signals of the acceleration sensor and the pressure sensor are transmitted to a controller after being processed, and the high-speed switch valves A1 and A2 are controlled by the controller to act.

The invention belongs to the technical field of engines, and particularly relates to an integrated engine brake rocker arm structure. A rocker arm is arranged on a rocker arm shaft, a roller is arranged at one end of the rocker arm and connected with a venting cam in a contacting manner, a brake mechanism with a one-way valve structure is arranged at the other end of the rocker arm and operates a venting gate bridge, an oil control valve mechanism is mounted on the rocker arm between the brake mechanism and the rocker arm shaft, a brake oil channel and a lubricating oil channel are formed in the rocker arm shaft, a first brake oil channel communicated with the oil control valve mechanism and a second brake oil channel communicated with the oil control valve mechanism and the brake mechanism are formed in the rocker arm, the first brake oil channel is connected or disconnected with the second brake oil channel through the oil control valve mechanism, rotation of the venting cam drives the rocker arm to swing around the rocker arm shaft, and the venting cam is matched with a solenoid valve signal to drive the oil control valve mechanism and the brake mechanism to act, so that the action of the venting gate bridge is controlled. The brake mechanism of an engine is integrally modular, simple, low in cost, convenient to mount and adjust and wide in applicability.

The invention discloses an M-shaped packaging bag opening mechanism, which comprises a rotary master disc, wherein the front end of the rotary master disc is rotatably provided with two corresponding swing arm spindles; the upper ends of the swing arm spindles are respectively provided with a swing arm; the front ends of the swing arms are respectively provided with a sucking disc seat; the lower ends of the swing arms are respectively provided with a gear; a rack respectively meshed with the two gears is arranged between the gears; a guide hole is arranged in the front end of the gear; a spring is installed in the guide hole; a connecting plate is arranged between the gear and the sucking disc seat; one end of the connecting plate is rotatably installed on the outer edge of the gear; the other end of the connecting plate is rotatably installed on a fixed support plate on the sucking disc seat; an idler wheel is rotatably installed in the rear end of the rack; and the idler wheel is in rolling cooperation with a swinging cam behind the idler wheel. The M-shaped packaging bag opening mechanism disclosed by the invention has the advantages of reasonable layout, small part amount, reliability in acting, stability in operation, high bag opening efficiency, pure mechanical mechanism, small travel, high operation speed, small inertial impact, convenience in regulation, high interchangeability, good adaptation on the packaging bag material and long service life.

The invention provides a multi-scale rock direct shear apparatus. The multi-scale rock direct shear apparatus comprises a framework, a vertical loading mechanism, a loading and moving mechanism, a transverse load supporting mechanism, a shearing and loading mechanism, a test sample height adjusting mechanism and a lower test sample restraining mechanism, wherein the vertical loading mechanism is connected with the upper end of the loading and moving mechanism; the two sides of the loading and moving mechanism are respectively connected with the transverse load supporting mechanism; the test sample height adjusting mechanism is located below the loading and moving mechanism, and a detection station for placing a test sample to be detected is arranged between the test sample height adjusting mechanism and the loading and moving mechanism; the lower test sample restraining mechanism is connected below the test sample height adjusting mechanism; the side edge of the detection station is provided with the shearing and loading mechanism; the vertical loading mechanism is mounted at the upper part of the framework; the transverse load supporting mechanism is mounted at the upper middle part of the framework; the shearing and loading mechanism is mounted at the lower middle part of the framework; the lower test sample restraining mechanism is mounted at the lower part of the framework. The invention provides the multi-scale rock direct shear apparatus which effectively meets a large-span load and the testing of the size of the test sample, and has good reliability.

An articulated boom arm for a rock boring machine, comprising a first kinked member having a drill guide at one end and a base pivot at the other end, and a pair of pivoted links. One of said links having a first end pivoted at said base pivot, the other of the links having a drill pivotally mounted at a first end thereof. The second ends of The first and second links being pivoted to each other whereby said drill is reciprocally linearly movable along said first member with a drill bit aligned with said drill guide and at one extremity of the reciprocal movement both said pair of links are substantially longitudinally aligned and extend towards said drill guide, and at the other extremity of the reciprocal movement both said pair of links are substantially longitudinally aligned and extend away from said drill guide.

The invention discloses an automatic guiding intelligent parking method and system based on a video image identification technology. The method comprises the steps: S1 acquiring an image for a vehicle entering a parking area, binarizing the vehicle image, and calculating the size of the vehicle model according to the projection of the binary image; S2 counting the stalls in the parking area in real-time; S3 according to the size of the vehicle model, selecting a matched stall, and calculating the optimal stall according to the relative position between the vehicle and the stall; and S4 calculating the optimal path from the current position of the vehicle to the optimal stall, and sending the optimal stall information and the optimal path to the owner of the vehicle. The automatic guiding intelligent parking method and system based on a video image identification technology can clearly assign a stall for the vehicle and avoid the process for finding a stall without a target for the owner of the vehicle, and can reduce the route of the vehicle in the parking lot by means of calculation of the optimal stall so that traffic congestion in the parking lot can be avoided and the parking efficiency can be improved.

The follow up blank sizing device for a steel tube comprises a symmetrical rolling support block under the upper working bench, parallel rolling bead guide track on the machine base, loop wheel plate on the spherical guide, mold base, rodless cylinder under the loop wheel plate, clamping mechanism at the sides of the mold base at both sides of the steel plate to be machined, broaching device on the top of the mold base, bottom of the support plate connecting to the cutting mechanism, guide post matching with the guide sleeve connecting symmetrically connected on the loop wheel plate face, on which installs symmetrical follow up oil cylinder, end of the sticking out bar of the follow up oil cylinder connecting to the bottom of the support plate respectively. It is reasonable in design, simple in structure, low in cost, small in land occupation and convenient.

A heterotype steel box and an orthogonal heterology plate bottom mold combined moving mould base and a construction method are provided, the load bearing beam of the moving mould base is the beam of the heterotype steel box, and a top plate and an inner web plate are the outer mould of a concrete box beam; the bottom mold employs orthogonal heterology structure, high toughness and low height, through opening and closing by flat pushing at one side, and line feed is performed in the space between the concrete box beam and a pier shaft. The main beam of the moving mold base is directly supported at the pier top, with the self-locking hydraulic jacket to transmit the load and adjust the height, the transverse moving of the moving mold base is finished at the pier top, and therefore, a steel structure landing leg is not required. The longitudinal moving of the moving mold employs a steel strand and a continuous hydraulic jacket for pushing and pulling, power for the longitudinal moving is located at the front pier top, and removes the difficulty of the application of a bridge fabrication machine for a railway and a road bridge, is the construction equipment for the concrete box beam of the railway passenger line and used in the road bridge.

The invention relates to the field of proximity switches, in particular to a novel magnetic proximity switch. The novel magnetic proximity switch comprises a shell, wherein a movable magnet is arranged inside the shell and can move up and down, a first terminal piece and a second terminal piece are fixedly arranged on the bottom of the interior of the shell side by side with one on the left of the other, a fixed contact is arranged at the upper end of the second terminal piece, an elastic piece is arranged on the first terminal piece, a movable contact is arranged at the outer end of the elastic piece, and the movable contact corresponds to the fixed contact; an assistance rod is arranged in the middle of the interior of the shell and can swing in the shell, an assistance part is arranged at the inner end of the assistance rod, a limiting mechanism is arranged between the assistance rod and the shell, the movable magnet corresponds to the assistance part, an elastic tongue piece is arranged on the elastic piece, and the outer end of the elastic tongue piece abuts against the assistance part. According to the novel magnetic proximity switch, the structural arrangement is reasonable, acting force borne by the elastic tongue piece can be effectively controlled through the limiting mechanism, and the technical problem that in the prior art, metal fatigue and arc discharge are prone to occurrence is solved.

The invention discloses a pot cover which comprises a pot cover body, a sterilizing module, a control device and a shielding module, wherein the sterilizing module comprises an ultraviolet LED lamp, and a light guide pillar is arranged at the light emitting side of the ultraviolet LED light. The pot cover has the advantages that the sterilizing effect is good, and the ultraviolet light is long in service life. The invention also discloses a pot which comprises a pot body and the pot cover covering the pot body. The pot has the advantages that the sterilizing effect is good, and the ultraviolet light is long in service life.The invention further discloses a pot additionally provided with a heat preservation module electrically connected with the control device, wherein the control device is arranged on the pot body and / or the pot cover body and is connected with the heat preservation module or a temperature sensor. The pot has the advantages that the sterilizing effect is good, and the ultraviolet light is long in service life. The invention further discloses a preservation method for food in the pot, which comprises the steps: during cooking, a shielding part covers the pot, a light passage is sealed; and after cooking is ended, preset sterilizing temperature is reached, the shielding part is opened, the light passage is opened, the ultraviolet LED light is turned on, and ultraviolet light is transmitted via the light guide pillar and penetrates through the light emitting side of the sterling module to irradiate food in the pot. The method has the advantages that the operation is simple and convenient, the sterilizing effect is good, and the preservation effect is good.

The invention relates to a single-cylinder plug pin type telescopic arm, a crane and a telescoping method of the single-cylinder plug pin type telescopic arm. The single-cylinder plug pin type telescopic arm comprises a basic arm and at least one section of telescopic arm which is sleeved in the basic arm, wherein coaxial central holes are formed in the tails of the telescopic arms; a telescopic oil cylinder is arranged in the central holes and comprises a cylinder rod and a cylinder barrel; at least two cylinder heads are fixedly sleeved outside the cylinder barrel in the longitudinal direction; at least three arm pin holes are respectively formed in the basic arm and the telescopic arm in the longitudinal direction. The single-cylinder plug pin type telescopic arm provided by the invention adopts the telescopic oil cylinder and the at least two cylinder heads; each cylinder head can be used for locking and unlocking the telescopic oil cylinder and any one telescopic arm; in a relay manner, the telescopic arms stretch or shrink; telescoping of the single-cylinder plug pin type telescopic arm is realized; the length of the oil cylinder is reduced; the cylinder diameter and the rod diameter of the oil cylinder are reduced; the cost of the oil cylinder is lowered; the loading weight is reduced; the hoisting capability is improved; the design capability of the crane is improved.

The invention discloses an alloy liquid extrusion casting forming device which comprises a hammerhead (1), a static die (2), a movable die (3) and a pouring slot (4). The device adopts the technical scheme that a declined and downward funnel-shaped pouring slot occupied by both the movable die and the static die arranged respectively by half is arranged on the parting plane on one side of a vertical die casting mould; a cylinder chamber type feed liquid chamber and the piston type hammerhead with a sealing knife is arranged on the static die; the hammerhead is controlled to be pushed up, and simultaneously the sealing knife seals the pouring slot. Firstly, feed liquid is filled into the a die cavity at high speed with low pressure, then the semisolid feed filled into the die cavity is extruded at low speed with high pressure, and the semisolid feed is gradually condensed to be formed under high-pressure low-speed extrusion. The alloy liquid extrusion casting forming device and the process method thereof integrate full casting functions of low-pressure filling and high-pressure extrusion into a whole, ensure that forming of alloy casting achieves the purposes of no gas entrapment, no cast seam, no mis-run, no forging crack, no fash, compact texture, fine crystal grain, high mechanical property, capability of performing thermal treatment and sealing, high dimensional accuracy, energy saving and low cost.

The invention provides an evaporator integrated component. The evaporator integrated component comprises a heat exchanger, connecting blocks and a thermal expansion valve, wherein the connecting block is fixed and mounted on a collecting main of the heat exchanger through welding; the thermal expansion valve is fixed and mounted on the connecting block through a screw; the collecting main is provided with a spacing plate for sealing and dividing the collecting main into a first cavity and a second cavity; and an inlet and an outlet of the heat exchanger are respectively positioned in the first cavity and the second cavity, and are communicated with the thermal expansion valve through the connecting blocks. The evaporator integrated component can realize no-pipeline connection between the expansion valve and the inlet and the outlet of the heat exchanger which serves as an evaporator, so that refrigerant is evenly distributed in the evaporator, and the energy loss of the refrigerant in the connecting pipelines is prevented; and the evaporator integrated component is simple in structure, and can effectively improve the efficiency of an air conditioning system and the energy saving performance.

The invention discloses a kind of pure water off-loading overflow valve consisting of a king pressure control valve and pure water electromagnet switching ball valve. The king pressure control valve consists of a king valve and a guide valve. The king valve plug having a secondary throttling cone valve structure with high pressure conduction is effective to restrain air muddy. The guide valve having cone valve structure with damping piston can increase motion damp and advance working stability of the overflow valve; constant pressure precision of the overflow valve is increased, if set constant liquid damp at the entrance of the guide valve. The electromagnet switching ball valve is generated by dry-type DC electromagnet, and is switched fast by mechanism of force amplification. The invention achieves zero leakage by sealing directly valve plug and valve cover, valve cover and valve body, improve static performance of the overflow valve by add valve port damper and achieve fast over-loading by electromagnets with larger thrust. The invention has characters of good versatility, integrated multifunction and being easy to standardize so as to fit to work under conditions of middle and high pressure water medium.

The invention discloses a steel drum production process through which arrangement of a conveying belt is reduced, the whole production line is shortened in travel, production efficiency is improved, occupied area is reduced and land cost is saved. The production process includes the following steps: 1, feeding a product into a welder prior to edge rolling and seam welding; 2, supplementarily coating the inside and outside of a drum body through a supplementary coater; 3, drying via an electromagnetic drying line; 4, performing air drying and cooling via a storage tank conveying belt; 5, entering a four-station machining device, and sequentially passing through a flanging and prerolling station, a cone expansion station, a coiling station and a rib expansion station; 6, conveying the drum subjected to rib expansion to a turnover-free bottom seal combination machine through the conveying belt and sealing the bottom; 7, feeding the drum with the bottom sealed into an automatic spot welder through the conveying belt, and mounting lugs to drum lugs.

The invention discloses a hydrothermal synthesis method for preparing nano-scale carbon-coated lithium iron phosphate, which belongs to the field of lithium-ion battery anode materials and comprises the following steps of: sequentially adding a phosphorus-source solution, an iron-source solution, a carbon source, a lithium-source solution and a boiling-point elevator into a reaction device in sequence, mixing, then heating to the temperature of 60-180 DEG C for reaction under inert gas, cooling after the reaction, filtering precipitates to obtain a nano-scale lithium iron phosphate precursor, and then sintering the nano-scale lithium iron phosphate precursor at the temperature of 400-600 DEG C under the protection of the mixed gas of the inert gas and hydrogen gas. The combination of lithium, iron, phosphorus and the like on a molecular level is realized by the method, and the grains of a product are quite fine and are uniformly distributed; because the boiling-point elevator is adopted, the reaction temperature and pressure of the reaction kettle are decreased; and the hydrothermal synthesis method has the advantages of simple preparation process, short flow, easiness in operational control, low reaction temperature, short time, low energy consumption and easiness in realizing large-scale industrialized production.

The invention relates to a corrugated pipe cut-off machine, which comprises a base. A boss is arranged at one end of the base, a cut-off cylinder and a first guide pipe are disposed on the boss, a second clamping cylinder is arranged on one side of the first guide pipe, a cutter is connected onto the cut-off cylinder and matches with a groove on the first guide pipe, a second guide pipe and an adjustable cylinder are arranged at the other end of the base, a linear guide track is disposed between the adjustable cylinder and the cut-off cylinder, and a first clamping cylinder is arranged on the linear guide track. The corrugated pipe cut-off machine has the advantages that electric elements including the four cylinders, a double-time setting relay, a counter, an electromagnetic valve and the like are integrated, and functions of an automatic corrugated pipe feeding device are realized by means of linkage of the cut-off cylinder, the adjustable cylinder and the two clamping cylinders. In addition, strokes of the cylinders are short, the running speed is fast, labor intensity of staffs is greatly reduced, semi-automatic pipe cutting operation is realized, cost investment is low, production efficiency is high, consumed working hours per capita can be reduced, and potential safety hazards caused by operational fatigue are eliminated.

The invention discloses an automatic assembling device for elements and an assembling method thereof. The automatic assembling device comprises a reciprocating motion working platform, a first element feeding device and a second element feeding device which are both fixedly arranged at one side of the reciprocating motion working platform, an element lifting device and an unloading device for conveying the assembled element group, wherein the reciprocating motion working platform reciprocates between the first element feeding device and the second element feeding device, captures two elements and automatically assembles the two elements, enables the elements to position independently and transfers the elements. The invention has simple structure, short stroke of mechanisms and high production efficiency, reduces the assembling steps, improves the production efficiency; besides, the element lifting device does not need to be positioned twice, thereby the assembling precision and the product quality are improved.

The invention provides a horizontal, full-automatic plate-frame type filter press, which adopts a double hydraulic cylinder to open the plate frame and utilizes a steadying bar fixed on a movable end to jack up a bearing bar hanging a filter cloth at the same time; after a filter cake is unloaded, a shower nozzle of a shower holder on the top of a bracket is used for spraying the water for washing all the filter cloths; the method adopts two cylinders to decrease pressure stroke, to reduce the cylinder volume and overcome the problems of uneven stress on the plate frame and non-tight sealing; by utilizing the movement of the hydraulic cylinder to hoist the filter cloth, the equipment is saved; by utilizing a plurality of shower nozzles to wash all the filter cloths simultaneously, a cleaning process is accelerated; by utilizing a supporting frame structure, the filter cloth can be replaced conveniently; by adopting a steel wire rope to control the supporting frame, the installation and the adjustment are very easy and convenient; the method has the advantages of simple structure, material saving and time saving, and fully utilizes a basic motive force to finish the entire pressing process without manual intervention, thereby improving handling capacity.

The invention discloses an optical anti-jitter voice coil motor, comprising a shell and a base connected with the shell, wherein an upper gasket, an upper shrapnel, a lower gasket and a lower shrapnel are arranged in the shell; a center through hole is formed in the upper end face of the shell; and a lens carrier is arranged in the center through hole. The optical anti-jitter voice coil motor is characterized in that the top of the lens carrier is connected with the upper gasket, and four corners of the upper gasket are connected with the lower gasket via suspension wires; the lower gasket is connected with the bottom of a coil frame, and the top of the coil frame is connected with the inner ring of the upper shrapnel; the outer frame of the upper shrapnel is connected with the top of a magnet frame; a first coil is arranged on the side wall of the coil frame, and a second coil is arranged on the side wall of the lens carrier; the first coil corresponds to a first magnet, the second coil corresponds to a second magnet, one of the first magnet and the second magnet is a unipolar magnet, while the other one is a bipolar magnet. The optical anti-jitter voice coil motor has the advantages of simple structure, low production cost, power saving and multi-degree-of-freedom jitter prevention.

An articulated boom arm for a rock boring machine, comprising a first kinked member having a drill guide at one end and a base pivot at the other end, and a pair of pivoted links. One of said links having a first end pivoted at said base pivot, the other of the links having a drill pivotally mounted at a first end thereof. The second ends of The first and second links being pivoted to each other whereby said drill is reciprocally linearly movable along said first member with a drill bit aligned with said drill guide and at one extremity of the reciprocal movement both said pair of links are substantially longitudinally aligned and extend towards said drill guide, and at the other extremity of the reciprocal movement both said pair of links are substantially longitudinally aligned and extend away from said drill guide.