145results about How to "Mesh precision" patented technology

The invention discloses a guide rail assembly used with a drawer-type refrigerator, which belongs to a device for loading, supporting or withdrawing refrigerated articles of the refrigerator. The guide rail assembly comprises a supporting portion which is formed in a way that two side walls of a storage chamber are raised inwards, a lead guide rail shaped in correspondence to the supporting portion and fixed on the supporting portion, a movable guide rail movably arranged on the guide slide rail, parallel shafts each with two ends arranged on the movable slide rail, a plane portion which is arranged in the lower part of the supporting portion and has a planar structure at the front end of a bracing portion, toothed racks arranged in a certain distance on the bracing portion in the moving direction of a storage vessel, and two pinions which are respectively engaged with the toothed racks and arranged adjacently to the two ends of each parallel shaft. The inventive guide rail assembly for drawer-type refrigerators can ensure the pinion of the parallel shaft at the back of the vessel to be accurately engaged with the toothed rack, thereby allowing the vessel to move smoothly.

The invention discloses a slide rail assembly used with a drawer-type refrigerator, which belongs to a device for loading, supporting or withdrawing refrigerated articles. The slide rail assembly comprises a supporting portion which is formed in a way that two side walls of a storage chamber are raised inwards, a guide slide rail shaped in correspondence to the supporting portion and fixed on the supporting portion, a movable slide rail movably arranged on the guide slide rail, parallel shafts each with two ends arranged on the movable slide rail, a bracing portion which is arranged in the lower part of the supporting portion, has a downward indentation and is provided with an elongated guide groove at the back, and guide wheels arranged adjacently to the two ends of the parallel shafts and guided by the guide groove. With the structure, the inventive slide rail assembly ensures the accurate assembly of a pinion of the parallel shafts at the back of a vessel with an engaged toothed rack, and allows the vessel to move smoothly.

The invention discloses an intelligent dust measurement and control system and a dust suppression and reduction method thereof. The system comprises a sensing module, a vision module, a decision module, a control module and an execution module, wherein the sensing module is used for acquiring environmental parameters of an area to be measured and controlled and a dust concentration value of a measuring point; the execution module is used for suppressing dust in the area to be measured and controlled; the control module is used for controlling the operation of each dust suppression device in the execution module; the vision module is used for obtaining multi-view images of all positions in an area to be measured and controlled. The decision module is connected with the vision module and used for gridding the area to be measured and controlled to obtain a three-dimensional gridding view field; the decision module is connected with the sensing module and is used for obtaining dust concentration distribution of the to-be-measured and controlled area so as to obtain a control strategy of the execution module; and the decision module is connected with the control module, so that the control module controls each dust suppression device to operate according to the control strategy. Grid monitoring, intelligent control and precise treatment of dust are achieved, and water and electricity resource consumption is reduced.

The present invention discloses an automatic fluorescence logging analyzer, which comprises an optical processing module, a central control module and a power source, wherein an automatic liquid preparing apparatus for automatically preparing a standard fluorescent liquid is further arranged in the automatic fluorescence logging analyzer and comprises an automatic liquid preparing device and a liquid conveying device for transferring a prepared standard fluorescent liquid, the automatic liquid preparing device comprises an injection arm, an injection pump and a rotatable object placement frame, the injection arm is connected to the injection pump in a sealed manner, a sample bottle with the sealed top portion is placed on the object placement frame, the injection arm injects an extraction liquid into the sample bottle and passes through the liquid conveying device comprising a liquid sucking pump and a liquid sucking arm, the liquid sucking arm sucks the standard fluorescent liquid in the sample bottle, and the liquid sucking pump sucks the standard fluorescent liquid in the liquid sucking arm and transfers to the optical processing module, such that the effects of whole-process extraction solution sealing and automatic extraction are achieved.

The invention discloses a self-balancing variable-pitch cone-shaped screw rotor. The screw rotor is in a cone shape on the whole, tooth crest arc radiuses R1 and leads(P1, P2 and P3) of rotor bodies are gradually reduced from air sucking ends(I-I) to air discharging ends(VII-VII), and tooth root arc radiuses R3, tooth crest thicknesses(S1, S2 and S3) and tooth root thicknesses(T1, T2, T3) are gradually enlarged from the air sucking ends(I-I) to the air discharging ends(VII-VII); a cross section line of any axial position is variable, but all cross section lines are composed of component curves of same type and comprise 12 curves, and every two adjacent curves are completely smoothly connected. According to the self-balancing variable-pitch cone-shaped screw rotor, the sizes of working cavities of the air sucking ends can be efficiently increased, and the sizes of working cavities of the air discharging ends are reduced, so that the rotor bodies each have a large inner-size ratio, and the inter-class sealing performance of the air discharging ends and the strength of the rotor bodies are improved; and the form centers of the cross section lines in any axial position of each rotor body are all located at the rotating center line of the corresponding rotor body, and the dynamic balance performance of the rotor bodies is good.

The invention discloses a rail type sector ash scrapper used for cylindrical horizontal electro-precipitator, which includes an arc steel rail fixed on a ring beam; the two ends of a sector bracket are respectively provided with a guide roller and a movable roller; the guide roller and the movable roller are connected with a steel rail in a rolling way; the fixed steel plates stretched from the two ends of the sector bracket are fixedly provided with an electric field ash scraper; the gear ring of the sector bracket is also provided with a ring beam ash scraper; the sector bracket moves on the steel rail through the rollers to drive the ash scraper to movably scrap ash on the arc steel rail. The rail type sector ash scrapper used for cylindrical horizontal electro-precipitator changes the top end hung support of A-shape bracket on the traditional internal sidewalk into the arc rail support on the ring beam of a shell, which guarantees the accurate, stable and reliable engagement of the sector bracket, omits the top end hung support bearing and grease lubricating system of the A-shape bracket, and saves investment and maintenance cost.

The invention discloses a toothed railway wheel rail-toothed rail transition device to enable a toothed rail vehicle to smoothly transit to a toothed rail section from a wheel rail section to ensure stable and safe operating of the vehicle. The toothed railway wheel rail-toothed rail transition device comprises a toothed rail mounted between steel rails on the two sides. A transition-section toothed rail is arranged in front of the traveling-in end of the toothed rail, a supporting arm is arranged in the middle of the upper portion of the transition-section toothed rail, a hydraulic cylinder is arranged at the traveling-in end, and a rotary arm is arranged at the traveling-out end. The upper ends of the supporting arm, the hydraulic cylinder and the rotary arm are hinged to the transition-section toothed rail, and the lower ends of the supporting arm, the hydraulic cylinder and the rotary arm are hinged to a sub-rail foundation through hinged supports. The hinged position of the supporting arm and the transition-section toothed rail is provided with an extension spring, and the two ends of the extension spring act on the transition-section toothed rail and the sub-rail foundation correspondingly. The traveling-in end of the transition-section toothed rail is provided with a roller parallel to rail teeth.

The invention relates to a method for operating a robot, which comprises a link chain having at least two coupling links, a first coupling link thereof being connected to a driven crank link, which can be rotated around a first rotation axis, in a second rotation axis in a pivoting manner, and a second coupling link thereof being connected to the first coupling link in a third rotation axis in a pivoting manner. A drive for the first coupling link is arranged on the second rotation axis and the second coupling link has an effector rotation point on the end region thereof which is opposite the first coupling link, wherein the method is designed such that the crank link and the first coupling link are driven in such a manner that the effector rotation point dwells in a resting position during the rotation of the crank link in a specific angle range. According to the invention, a torque is applied to the first coupling link by means of the drive on the second rotation axis in order to shorten the dwell time of the effector rotation point, which torque in the timespan of the desired dwell duration equals a maximum of 5% of the torque that would be necessary to implement a dwelling of the effector rotation point having an unshortened dwell duration. The invention furthermore relates to a robot for carrying out the method.

The invention provides a screw rotor with a variable pitch and a variable meshing clearance and a double-screw type gas-liquid mixture pump. The screw rotor is composed of a suction section (I) and a compression discharge section (II), wherein the molded line of the cross section of the suction section (I) is kept unchanged, so that zero-clearance meshing is realized; the molded line of the cross section of the compression discharge section (II) is variable, so that clearance meshing is realized, and the meshing clearance is greatly increased; and in any axial position, the molded line of the axial cross section of the screw rotor comprises six curves and one point. Internal compression is generated by the variable pitch, so that the pressurization process of gas-liquid media is stable; the screw rotor adopts the variable meshing clearance, so that a pressure relief channel from a compression chamber to the direction of an outlet is formed during operation; and in a gas-liquid mixed pressurization process, the volume of the compression chamber is gradually reduced, and a small quantity of gas-liquid media leak from the compression chamber to the outlet, so that random unloading of liquid-phase compression is realized, and the problems of pressure surge and liquid impact which are easily caused by incompressibility of liquid are solved.

A linked locking mechanism and antenna down-tilt angle control device is described. Linked locking mechanism includes: mounting frame with a mounting positions, each mounting position has a mounting through hole and a clamping body. Output assembly includes an output shaft and output gear resiliently disposed on output shaft. One end of output gear has engaging body engaged with clamping body and pressing body provided through mounting through hole. Rotating bracket has pressure bearing surface pressed against pressing body. Arc-shaped embossments are provided on pressure bearing surface. The arc-shaped embossment includes guide end, anti-reverse end, and mating body. When mating body and pressing body abut, and engaging body and clamping body are separated, output gear drives output shaft to rotate. Linked locking mechanism and antenna down-tilt angle control device provide easy positioning and accurate control of down-tilt angle of antenna.

The invention discloses a movable inclined platform type automatic steel bar bending machine, comprising a rack, a track, a gear rack and two automatic steel bar bending machines. The two steel bar bending machines are respectively provided with a gear transmission mechanism and a gear floating mechanism which move along the gear rack; the gear floating mechanism comprises a motor connecting plate and a support shaft; the motor connecting plate penetrates through and is hinged at one end of the support shaft, and the other end of the support shaft is fixed on a cabinet of each automatic steel bar bending machine; one end of the motor connecting plate is fixed on a motor flange plate in the gear transmission mechanism, and a gear in the gear transmission mechanism is meshed with the gear rack; and the other end of the motor connecting plate is supported on the cabinet of the automatic steel bar bending machine in a floating manner. The movable inclined platform type automatic steel bar bending machine has the beneficial effects that the accurate meshing between the gear and the gear rack in a travelling mechanism of the automatic steel bar bending machine can be ensured, the running is stable, the structure is simple, and an inclined platform type working table surface saves effort, is easy to operate, ensures the safety of an operator and realizes the humanized operation.

The invention relates to an integral automatic assembly machine of a gear box oil injector. The machine comprises a frame and a matching control box; the frame is provided with two conveying devices; conveying carriers are arranged on the conveying devices; a transposition cylinder arranged on the frame is used for converting on two conveying device; the conveying carrier includes a conveying carrying base; the middle part of the conveying carrying base is an assembly carrier, and two sides are respectively a gear shaft placing carrier and a cover plate placing carrier; the conveying device on the back side is matched with a gear shaft loading manipulator, a cover plate loading device, a glass ball assembly device, a gear shaft loading device, a gear loading device and a closing copper cover loading device; and the conveying device on the front side is matched with a box body transfer device, a closing copper cover riveting device, a gear shaft oil injecting device, a gear shaft assembly device, a cover plate assembly device, a bolt locking device and an unloading manipulator. The machine can guarantee precise engagement with gears in subsequent gear shaft assembly, realizes integral automatic precise assembly, and greatly improves the assembly efficiency and the yield.

The invention discloses a fully meshed vortex tooth with a gradually varied wall thickness. A meshing profile of a static vortex tooth (1) is formed by smoothly connecting four curves, which comprises an equal-distance curve FH of a first reducing base circle involute, an equal-distance curve FG of a first circle involute, an equal-distance curve GM of a second circle involute and an equal-distance curve MN of a second reducing base circle involute; a dynamic vortex tooth rotates by 180 degrees relative to a central O point, and then is completely superposed with the static vortex tooth; the thickness sigma of the vortex tooth is gradually increased from the outer ring to the center; and in a working process, the dynamic vortex tooth is correctly meshed with the static vortex tooth. The fully meshed vortex tooth with the gradually varied wall thickness disclosed by the invention can increase air inflow of a scroll compressor, increases a compression ratio, increases an area utilization rate, increases strength of the vortex tooth in an air exhaust area, is beneficial for designing and processing the vortex tooth, and improves working property of the vortex tooth.

The invention discloses a three-blade elliptic arc type cam rotor, and belongs to the technical field of cam rotor pumps. The profile of a left side cam rotor body (1) of the three-blade elliptic arc type cam rotor is formed by smoothly connecting six sections of curves end to end, wherein the curves sequentially include a first elliptic arc section A1B1C1, a first elliptic arc conjugation envelope line C1D1E1, a second elliptic arc section E1F1G1, a second elliptic arc conjugation envelope line G1H1I1, a third elliptic arc section I1J1K1 and a third elliptic arc conjugation envelope line K1L1A1. The two same cam rotor bodies can be correctly engaged in the synchronous different-direction double-rotation movement process. The three-blade elliptic arc type cam rotor which is put forward has the beneficial effects of being good in sealing performance, high in area utilization rate, large in range of the ratio of the rotor outer circle radius R1 to the pitch radius R2 and convenient to machine.

The invention relates to a bidirectional power output linkage device and an antenna downward inclination angle control device. The bidirectional power output linkage device comprises an input shaft, a first transmission mechanism, a second transmission mechanism, a third transmission mechanism and a one-way control mechanism. The first transmission mechanism comprises a first inner gear ring, a first gear coaxial with the first inner gear ring, a second gear in action connection with the first gear, and a first planet frame. The second transmission mechanism comprises a first rotary part in fixed and transmission connection with the first planet frame, and a second rotary part in action connection with the first rotary part. The third transmission mechanism comprises a second planet frame arranged on the second rotary part, a third gear installed on the input shaft, and a fourth gear engaged with the third gear. The one-way control mechanism is used for controlling the rotation direction of the first rotary part to be opposite to the rotation direction of the second rotary part. The bidirectional power output linkage device and the antenna downward inclination angle control device can realize independent and accurate control over the downward inclination angles of two or more beam antennas, the structure is compact, and the overall size is small.

The invention discloses a screw rotor without an acute-angle cusp, and belongs to the technical field of dry-type double-screw vacuum pumps. A screw rotor end face profile is composed of six curves, and the other adjacent curves are in smooth connection except that the circle involute AB and the tooth crest arc BC are in non-smooth connection. The tooth crest arc BC and the tooth root arc EF are in smooth connection by the adoption of the arc CD and the equidistant curve DE of the cycloid, and the acute-angle cusp in an original screw rotor end face profile is eliminated. In work, the two screw rotor end face profiles are identical and can be accurately engaged. Thus, the screw rotor generated by the screw rotor end face profile is composed of six tooth surfaces, the other adjacent tooth surfaces are in smooth connection except that the tooth crest surface (11) and the oblique tooth surface (13) are in non-smooth connection, and no acute-angle edge exists. The screw rotor has the advantages of being simple in structure, high in strength, good in leakproofness and long in service life.

The invention discloses a novel gear and relates to the technical field of gears, and the novel gear is used for solving the problem that a gear is inconvenient to mount when a gear shaft cannot rotate. The novel gear comprises a gear plate and a gear seat, wherein a mounting hole is formed in the center of the gear plate; at least three threaded holes are formed in the circumference which takes the center of the gear plate as a circle center; the gear seat is a circular metal plate; a circular boss matched with the mounting hole is arranged at the center of one end face of the gear seat; a wheel shaft hole matched with the gear shaft and a flat key penetrates through the boss and the gear seat; cambered slots are uniformly formed in the gear seat outside the boss along the circumferential direction, and the number of the cambered slots is the same as that of the threaded holes; the multiple cambered slots are respectively opposite to the multiple threaded holes; screws are mounted in the cambered slots and the corresponding threaded holes in a matched manner. The wheel shaft hole is matched with the corresponding gear shaft and the flat key by rotating the gear seat, so that the gear can be accurately meshed, and a driving gear and a driven gear are convenient to mount.

The invention discloses a self-balancing conical screw rotor. The screw rotor is characterized in that the screw rotor is integrally conical; from an air suction end (I-I) to an exhaust end (VII-VII), the tooth crest circular arc radius R1 of the rotor is gradually decreased, and the tooth root circular arc radius R3 of the rotor is gradually increased; the tooth crest thickness delta 1 and the tooth root thickness delta 2 of the screw rotor remain unchanged in the axial direction; section molded lines change at arbitrary axial positions; 12 curves composed of the section molded lines are the same in type; and the adjacent curves are completely smoothly connected. According to the self-balancing varying pitch conical screw rotor provided by the invention, the volume of working chambers of the air suction ends can be effectively increased, the volume of working chambers of the exhaust ends is decreased, the rotor has relatively large interior volume specific ratio, and the interstage sealing performance of the exhaust ends and the strength of the rotor are guaranteed; and centroids of the section molded lines at arbitrary axial positions of the screw rotor are on a rotation central line of the screw rotor, and the dynamic balance performance of the screw rotor is good.

The invention discloses an elliptical-arc-shaped Roots rotor, and belongs to the technical field of Roots vacuum pumps. A molded line of a left-side Roots rotor (1) is composed of four sections of curves which are in smooth connection end to end, wherein the molded line sequentially comprises: a first elliptical arc section A1B1C1, a first elliptical arc conjugated envelope curve C1D1E1, a second elliptical arc section E1F1G1 and a second elliptical arc conjugated envelope curve G1H1A1; two identical Roots rotors can realize accurate engagement in a synchronous and incongruous double-rotary movement process; the elliptical-arc-shaped Roots rotor disclosed by the invention has the advantages of good air tightness, high area utilization rate, a large range of a ratio of a rotor excircle radius R1 to a pitch radius R2 and convenience for machining.

The invention relates to a picking device with self-adaptability to sizes of apples. The picking device is characterized in that a telescopic rod, support racks and two symmetric fruit clamping platesfunction as a main body; a holding handle which is fixedly connected through welding and a pull handle which is capable of moving at the front end of the holding handle are arranged at the tail end of the telescopic rod; the Y-shaped support racks which are fixedly connected are arranged at the front end of the telescopic rod; linkage connecting rods which are moveably rotated are arranged between front ends of the support racks and the fruit clamping plates; a central positioning body which is fixedly connected with the support racks is arranged between bottoms of the support racks and the fruit clamping plates; semicircular blades and magnet columns in up and down symmetry are respectively arranged at the front end of each fruit clamping plate; a steel wire rod of which the length can be adjusted is arranged between each fruit clamping plate and the pull handle; and a sponge is arranged in the middle of each fruit clamping plate. As sawtooth-shaped blades are adopted for cutting, twigs and leaves can be prevented from dragging damage; due to adoption of the magnet columns, the blades can be precisely and rapidly meshed; and in addition, as a layer of a sponge is adhered to the inner wall of each fruit clamping plate, the picking device is in self-adaptability to sizes of apples.

The invention belongs to the field of rail traffic, and particularly relates to a toothed rail train transition device. The device comprises a toothed rail, a transition mechanism, two fixed gears, a jacking gear, a chain and a limiting stop dog, the toothed rail is fixed between two rows of steel rails, the transition mechanism is arranged in front of the driving-in end of the toothed rail and provided with the driving-in end and the driving-out end, the two fixed gears are arranged at the driving-in end and the driving-out end of the transition mechanism respectively, the jacking gear is arranged between the two fixed gears, the limiting check block is arranged on a rail bed between the two fixed gears, a first spring and a second spring are arranged at the two ends, in the length direction of the toothed rail, of the limiting check block correspondingly, the opposite ends of the first spring and the second spring are connected with a first fixed block and a second fixed block correspondingly, a boss is arranged at the end, close to the driving-out end of the transition mechanism, of the side wall of the limiting check block. According to the toothed rail train transition device, the meshing state of a driving gear is adjusted through the tensioning force of a chain, and it is guaranteed that the gear is accurately meshed with the chain.

The invention discloses a screw rod transmission starter and a control method thereof. The screw rod transmission starter comprises a control mechanism, a starting motor and a transmission mechanism,the control mechanism comprises a screw rod and a screw rod driving motor arranged at one end of the screw rod. The transmission mechanism comprises a single-way clutch slidably arranged on an outputshaft of the starting motor and a starting gear arranged on the single-way clutch. The screw rod is provided with a push rod, one end of the push rod is in fit connection with the screw rod, and the other end of the push rod is connected with the single-way clutch. When the screw rod drives the motor to drive the screw rod to rotate, the push rod moves left and right along the screw rod to drive the single-way clutch to move left and right along the output shaft of the motor, and thus the starting gear is engaged or disconnected with a flywheel gear ring of an engine. The starter is convenientto maintain, noise is low in the resetting process of the transmission mechanism, and the service life of the starter is prolonged.

The invention provides a fervent material output machine and solves the problem that for a present conveyor, a conveying steel strip has a complex structure and can not bear impact from large coke blocks, which is caused by the fact that the conveying steel strip needs to be tensioned automatically. The technical scheme is adopted as follows: a heat-resisting conveying steel strip is wound between a cylindrical drive shaft and a cylindrical driven shaft; the upper part of the heat-resisting conveying steel strip is a working face which is supported by a water-filled pad bed; the lower part is the return stroke of the heat-resisting conveying steel strip and supported by a plurality of carrier rollers; the water-filled pad bed is welded at the upper part of a machine body, and the plurality of carrier rollers are mounted at the lower part of the machine body; two gears are mounted at the two ends of the cylindrical drive shaft respectively; the two gears at the two ends are both provided with angle adjusters; a row of sprocket holes are formed on each of the two sides of the heat-resisting conveying steel strip; and the sprocket holes on the two sides are meshed with the gears at the two ends of the drive shaft. By adoption of such a transmission manner that the gears of the drive shaft are meshed with the sprocket holes of the heat-resisting conveying steel strip, an automatic steel strip tensioning device is not needed, and the transmission is accurate and reliable; and the angle adjustors can enable the gears at the two ends of the drive shaft to be precisely meshed with the sprocket holes on the two sides of the heat-resisting conveying steel strip.

The invention discloses a moving door mechanism and an air conditioning device. The moving door mechanism comprises a motor, a gear box, a gear, a rack and a moving door, wherein the motor is fixed atthe gear box; the gear is accommodated in the gear box and is connected with an output shaft of the motor; the rack is mutually meshed with the gear; the moving door is fixed on the rack; and the gear box comprises at least one moving component, and the moving component props against the moving door and bears the weight of the moving door. According to the technical scheme, the moving door mechanism is steady to work and does not shake, noise in the motion process is reduced, and the user experience is improved.

The invention relates to a guide rail mechanism, which comprises a frame, a gear, a rack and a guide rail, wherein the rack is positioned above a pair of rollers, and the guide rail is parallel to the rack. A guide wheel matched with the guide rail is mounted on the guide rail and is coaxial with the gear. The guide rail is separated from the rack and is parallel to the rack, and the guide wheel coaxial with the gear runs along the guide rail, so that deviation and derailment in the prior art are avoided, and the gear is more accurately engaged with the rack. As a groove matched with the guide rail is arranged on the outer circumferential surface of the guide wheel, the guide wheel can change angles while running along the guide rail, movement stability of a power assisting ladder is improved, and safety of passengers is ensured.

The invention relates to an assembly machine for a glass bead gear box oiler, and the assembling machine comprises a frame and a cooperation control box. The frame is provided with two conveying devices, and each conveying device is provided with a conveying carrier tool. Moreover, a transposition air cylinder disposed on the frame performs the transposition on the two conveying devices. Each conveying carrier tool comprises a conveying material carrying seat, wherein the central part of each conveying material carrying seat is provided with an assembly carrier tool, and two sides of the conveying material carrying seat are respectively provided with a gear placing carrier tool and a cover plate installation carrier tool. The conveying device at the rear side is cooperatively provided witha gear charging mechanical arm, a cover plate charging device, a glass bead assembly device, a gear shaft charging device, a gear charging device and an alloy copper cover charging device. A box bodyconveying device, an alloy copper cover pivoting device, a gear shaft oil injection device, a gear shaft assembly device, a cover plate assembly device, a bolt locking device and a discharging mechanical arm are cooperatively disposed above the conveying device at the front side. The assembly machine can guarantee the precise engagement with a gear during the later assembly of the gear, achievesthe integrated automatic precise assembly, and greatly improves the assembly efficiency and yield.

The invention relates to an electric pump for an automobile drive-by-wire braking system and belongs to automobile industries. The electric pump for the automobile drive-by-wire braking system is applied into the automobile drive-by-wire braking system. A guide sleeve is matched with a cylinder body inner hole in an interference mode, one axial end of the guide sleeve makes contact with a limiting step of the cylinder body inner hole, and the surface of a guide sleeve inner hole is a cylindrical surface; the two sides of the cylindrical surface are symmetrically provided with axial guide rail straight grooves, an axial rack straight groove is formed in the bottom of the cylindrical surface, and the diameter of a sealing cylindrical surface is larger than that of a guiding part; a secondary packing cup is sleeved with the sealing cylindrical surface of a piston, strip-shaped protruded guide rails are symmetrically arranged on the two axial sides of a cylindrical surface of the guiding part, and racks are arranged at the bottom of the cylindrical surface of the guiding part in the axial direction; and the sealing cylindrical surface of the piston is matched with a cylinder body primary hole in an interval mode, the guiding part is matched with the cylindrical surface of the guide sleeve inner hole in the interval mode, and the guide rail straight grooves are matched with the guide rails in the interval mode. The electric pump for the automobile drive-by-wire braking system has the advantages that the structure is novel, the number of teeth, engaged with the racks, of transposition gear drive wheels is automatically switched under a low-temperature state so that the pressure-building stroke of the piston can be reduced, return stroke time of the piston is increased, timely supplement of braking fluid at a low temperature is facilitated, and the reliable work of the electric pump under the low-temperature state is ensured.

The invention discloses an air compressor jigger convenient to operate. The air compressor jigger convenient to operate comprises a small gear, a large gear ring, a speed reducer, a support and an electric cabinet, wherein the two sides of the top of the support are provided with a second fixing plate through first bolts, the top ends of the first bolts are connected with first nuts through threads, a long groove is formed in the top of the second fixing plate, the top of the long groove is provided with a first fixing plate through a specially-made double-head bolt, the specially-made double-head bolt is sleeved with a special gasket and a specially-made elastic pad, the top of the fixing plate is provided with a speed reducer through a second bolt, the second bolt is sleeved with a second elastic pad and a second gasket, one side of the speed reducer is provided with a double-shaft end motor through a fixing bolt, one side of the double-shaft end motor is connected with an input shaft of the speed reducer, and the other side rotating shaft of the double-shaft-end motor is provided with a hand wheel through a screw. The air compressor jigger is convenient to operate, can realize point-to-point and continuous rotation, is convenient to operate and use and meets the disc-to-turn requirement of an air compressor shaft.

The invention discloses a combined bearing used for a vertical epicyclic gearbox of a nuclear power circulating water pump. The combined bearing comprises a thrust bearing (1), a flexible support block (2), a radial bearing (3), a thrust bearing seat (4) and a radial bearing seat (5); the thrust bearing (1) radially penetrates through the thrust bearing seat (4) and presses on the flexible supporting block (2); an adjusting bolt (6) radially penetrates through the radial bearing seat (5) and presses on the radial bearing (3); and adjusting curved support structures are arranged between the thrust bearing (1) and the flexible support block (2), and between the radial bearing (3) and the radial bearing seat (5). In the invention, a combined bearing with large bearing capacity, long service life and easiness of disassembly and maintenance is provided; the combined bearing is used for supporting a planetary carrier and bearing large thrust and radial force generated by operation of a circulating water pump, and ensuring that the gear stands under load and the bearing is subjected to uniform stress through self-adjustment.