18366 results about "Rack and pinion" patented technology

The invention provides a cable protection pipe butt welding device, and relates to the technical field of welding, the cable protection pipe butt welding device comprises a welding table, two butt joint tables are arranged at the top end of the welding table, two fixing seats are fixedly mounted at the top ends of the butt joint tables, and a fixing assembly for fixing a cable protection pipe is arranged between the two fixing seats; a grinding assembly used for grinding the cable protection pipe is arranged in the middle of the welding table, the fixing assembly comprises two supporting frames fixedly connected to the top end of the butt joint table, an annular rack is rotationally connected between the two supporting frames, and a clamping assembly used for fixing the cable protection pipe is arranged on the inner wall of the annular rack. Annular guide rails are fixedly connected to the two sides of the outer surface of the annular rack, the cable protection pipe is fixed to an inner cavity of the annular rack through the clamping assembly, the cable protection pipe can rotate according to changes of the welding position through the annular rack, the flatness of the welding position is guaranteed through the grinding assembly, and the welding efficiency and quality of the device are effectively improved.

The invention provides a multi-dimensional supporting leg structure for lightweight steel ring splicing equipment, and relates to the field of tunnel engineering. The mounting base is fixedly connected with the frame, the telescopic driving mechanism is arranged between the mounting base and the supporting leg assembly, the angle adjusting mechanism is arranged between the cylinder barrel and the mounting base, and the self-locking mechanism is used for locking the cylinder barrel and the piston rod when the driving unit fails. The telescopic driving mechanism is composed of a cylinder barrel, a piston rod and a driving unit, the angle adjusting mechanism is driven through a first rotating shaft and a second rotating shaft which are perpendicular to each other and corresponding rotation, so that the cylinder barrel achieves double-shaft swing adjustment, the self-locking mechanism is composed of a locking rack, a movable tooth claw, a reset spring, an electromagnet and a permanent magnet, and power-on unlocking and power-off self-locking are achieved. According to the structure, the supporting polygon is obviously enlarged under the complex basic condition, the anti-overturning stability of equipment is improved, reliable supporting is kept when a hydraulic system fails, and the safety and adaptability of steel ring splicing operation in a tunnel are improved.

A dehumidifier according to an embodiment may include a housing including a suction grill formed on a rear surface thereof, and a discharge port formed on an upper surface thereof; a dehumidification module provided inside of the housing; a water tank detachably provided on one side of the housing and that stores condensate generated during a dehumidification process; a discharge cover that opens and closes the discharge port; a tilting module connected to a bottom of the discharge cover inside of the housing to tilt the discharge cover; and a shielding cover that accommodates the tilting module. The dehumidification module may include at least a compressor, a condenser, an evaporator, and a fan module. The tilting module may include a tilting motor fixed to the shielding cover; a tilting gear connected to a shaft of the tilting motor; and a tilting neck curved at a predetermined curvature and having on one surface thereof a tilting rack that engages with the tilting gear.

The invention discloses a steel structure butt welding adjusting device and method, and relates to the technical field of steel structure welding, the steel structure butt welding adjusting device comprises a welding table, fixing seats are symmetrically and fixedly connected to the upper end face of the welding table, steel pipe bodies are placed above the fixing seats, and the steel pipe butt welding adjusting device further comprises a steel pipe alignment detection mechanism and a welding path pretreatment mechanism; the steel pipe alignment detection mechanism comprises symmetrically-arranged circular rings, annular grooves are formed in the two sides of each circular ring, supporting frames are arranged on the two sides of each circular ring, the supporting frames are fixedly connected to the upper end face of the welding table, the circular rings are rotationally connected between the two supporting frames through the annular grooves, and annular racks are fixedly connected to the outer surfaces of the circular rings. The annular racks are in meshed connection with transmission gears, and a driving shaft is fixedly connected between the two transmission gears in a penetrating mode, so that the alignment condition can be rapidly detected after the steel pipe body is placed, a worker can rapidly conduct adjustment according to the detection result, the time for manual repeated inspection and adjustment is shortened, and the steel pipe body adjusting efficiency is improved.

In accordance with at least one aspect of this disclosure, an adjustable stock system for weapons and / or other suitable devices incudes an adjustable stock, a mounting box defining an interior cavity and a mounting feature configured to mount the adjustable stock to a device, and a moveable assembly including one or more moveable components configured to move relative to the mounting box. The moveable assembly comprises, at least, a rack and pinion assembly configured to bias a buttpad toward an extended position, and a rack stop configured to hold the rack and pinion assembly in place at a desired position.

The utility model relates to the technical field of metal material welding, in particular to a black metal smelting rolled product welding device which comprises a base, two metal pipes horizontally placed above the base and with the two ends aligned, and a welding head arranged at the upper end of the base. The first motor is driven to drive the second gear to rotate on the rack, so that the welding positions of the metal pipes abut against each other, the metal pipes with different length specifications and outer diameter specifications are extruded, fixed and welded, it is guaranteed that the welding positions of the metal pipes are kept in a stable abutting state all the time when the metal pipes are welded, and the welding quality and efficiency are improved; and meanwhile, a second electric telescopic rod drives a first electric telescopic rod to stretch out and draw back to the welding position of the metal pipe, and then the first electric telescopic rod drives a welding head to abut against the metal pipe, so that the welding head conducts comprehensive welding work on all the welding faces of the metal pipe.

The present application relates to the technical field of piano, in particular to a piano pedal system, comprising an external unit and an additional unit; the external unit comprises: an external pedal module comprising at least one external pedal; a data acquisition module for acquiring the pedal data of the external pedal; a height adjustment module comprising a driving mechanism and two supporting mechanisms, the driving mechanism comprising a driving motor, a driving gear fixedly connected with the output shaft of the driving motor and two driving racks, the two driving racks being oppositely engaged on both sides of the driving gear, the supporting mechanisms being one-to-one arranged with the driving racks, the supporting mechanisms being connected between the driving racks and the external pedal module, the driving racks driving the supporting mechanisms to stretch or retract to realize the height adjustment of the external pedal module; the additional unit is used for stepping on the corresponding piano pedal according to the pedal data. The present application can be applied to different types and models of pianos and improve the accuracy and convenience of the height adjustment of the pedal.

The invention provides a multifunctional cycle power generation system and method by a gravity lever. The system comprises a supporting rack and a balance weight arranged on the supporting rack and slidably matched with the supporting rack, wherein engines are arranged on one side or two sides of the balance weight; the input shaft of each engine is connected to a transmission shaft; two or more single-directional clutches are fixedly connected to the middle of the transmission shaft; the locking directions of the single-directional clutches are same, gears are fixed to the peripheries of thesingle-directional clutches, and a rack matched with each gear to drive the transmission shaft to rotate is arranged next to each single-directional clutch; at least one pair of racks is arranged on the upper part and the lower part, separately, the racks and the balance weight which reciprocates are in driving movement and the balance weight is arranged on the supporting rack to swing through a lifting mechanism in a reciprocating manner. As the balance weight which swings in the reciprocating manner pulls the racks to drive the transmission shaft to rotate in the single direction, multiple engines can be driven synchronously to generate electricity synchronously, and the power needed by a supporting rack lifting device is alleviated greatly by means of a swing mode like to a lever, so that the energy sources are saved and the power generation efficiency is improved greatly.

The invention discloses a mahjong machine and a slope tile playing device thereof, which are characterized in that a planet carrier and a planet wheel which rotate actively rotate around a fixed sun wheel, and a tile feeding push rod is driven by the planet carrier, the planet wheel and a turntable to rotate to push and feed tiles; a mahjong lifting swing arm is driven by a planet carrier, a swing rod, a rack and a mahjong lifting gear to swing to drive a mahjong lifting supporting plate to lift mahjong; two transmission paths of a planet carrier and a planet wheel are ingeniously utilized, so that a mahjong feeding push head does not push mahjong tiles when a mahjong tile lifting supporting plate is controlled to descend only through mechanical transmission cooperation by a motor, and the mahjong tile lifting supporting plate does not move when the mahjong tile feeding push head pushes the mahjong tiles; when the tile lifting supporting plate is lifted, the tile feeding pushing head does not push tiles, after the tile lifting supporting plate is lifted, the tile feeding pushing head moves out of the tile storage groove, the lifting action of the tile lifting supporting plate and the tile pushing action of the tile feeding pushing head do not interfere with each other, the structure is simple and reasonable, action connection is good, operation is stable and reliable, the mahjong machine is coherent and smooth in action, noise is low, and the user experience is good.

The invention discloses an anti-pulling protection mechanism for a charging pile, and belongs to the technical field of charging equipment, and the anti-pulling protection mechanism comprises the charging pile which is used for providing electric quantity; the charging head is connected with the charging pile through a charging wire and used for charging the vehicle; the separating mechanism comprises a steel wire rope arranged on the charging head and is used for separating the charging head from a charging hole in the vehicle; the separating mechanism is further provided with a releasing assembly which comprises a pressing rod arranged on the charging head handle and a buckle component used for releasing the charging head handle. In the invention, when a user does not pull out a charging head after charging and drives a vehicle to be pulled, a steel wire rope is tensioned to trigger a separation mechanism, a hydraulic system transmits pressure to a handle buckle through an oil cavity and a sliding rod to unlock, and meanwhile, a rack I, a rack II and a circular gear are linked to push a push rod to push out the charging head, so that the charging head is separated from a charging interface; the mechanical damage caused by accidental pulling of the charging wire and the charging pile is effectively avoided, and the equipment safety is remarkably improved.

The utility model discloses a support for steel structure welding, and relates to the technical field of steel structure welding. The support for welding the steel structure comprises a welding table, two arc-shaped grooves are oppositely formed in the welding table, gear rings are movably arranged in the arc-shaped grooves, a plurality of electric push rods are installed on the inner sides of the gear rings, and the telescopic ends of the electric push rods are connected with clamping plates so that the steel structure to be welded can be conveniently clamped and fixed; a lead screw is arranged on the lower side of the welding table, a movable plate is arranged on the lead screw in a threaded mode, fixed rods are fixed between the movable plate and the racks on the two sides, under the action of the lead screw, the movable plate can be conveniently adjusted to move front and back, and the racks are driven to synchronously move in combination with the fixed rods; and therefore, the purpose of synchronously adjusting the two to-be-welded steel structures to rotate is achieved, welding operation can be conveniently carried out on the circle of the butt joint of the steel structures, workers do not need to turn over the steel structures, manpower is saved, and the welding efficiency is improved.

Provided is a display device comprising: a display panel outputting an image on the front thereof; and a drive unit coupled to the back of the display panel and moving the display panel in the vertical direction, wherein the drive unit comprises: a motor providing rotational force; a pinion gear module which rotates by means of receiving the rotational force of the motor and which includes a first pinion gear and a second pinion gear arranged side by side in the vertical direction; and a rack gear located on the back of the display panel, extending in the vertical direction, and maintaining engagement with at least one of the first pinion gear or the second pinion gear.

The invention discloses an automobile aluminum alloy integrated die-casting part demolding ejection device, and relates to the field of die casting, the automobile aluminum alloy integrated die-casting part demolding ejection device comprises a first mounting frame and a first driving motor mounted on one side of the bottom of the first mounting frame, two pushing mechanisms are symmetrically mounted at the top of the first mounting frame, and ejection mechanisms are fixedly mounted at the tops of the pushing mechanisms. According to the invention, the pushing mechanism is driven to realize ejection operation, multiple adjustable ejection rods are arranged to adapt to die castings with different sizes and ensure uniform stress, a gear ring rotates under the limitation of an outer ring, multiple transmission gears are driven to be meshed synchronously, and a rack is further driven to move, so that the coordinated adjustment of the positions of the ejection rods is realized; the ejector rods can be synchronously gathered or dispersed according to the size of a casting, so that uniform distribution of ejection force is effectively guaranteed, deformation or damage caused by uneven stress of the die casting is avoided, and the stability and efficiency in the demolding process are improved through the structural design.

This invention discloses a press-to-rebound damping slide rail, belonging to the field of slide rail technology. The press-to-rebound damping slide rail of this invention includes a slide rail assembly and a press-to-rebound damping device. The slide rail assembly includes a fixed rail and a movable rail. The gearbox of the press-to-rebound damping device is equipped with a transmission gear and a clutch mechanism that mesh with a rack on the movable rail. In the first position, the gearbox has a rebound spring and a self-closing spring stretched and stored energy, and the gearbox is locked in the base. In the first position, the trigger part of the trigger transmission block is pushed by the trigger plate on the movable rail, causing the gearbox to unlock and rebound to the second position. The clutch mechanism locks the reverse rotation of the transmission gear and drives the rack and movable rail to rebound and move together. This invention organically combines the press-to-rebound mechanism and the damping closing mechanism, ensuring that the stability of their cooperation is not reduced by factors such as installation errors, making assembly simpler and more convenient, and guaranteeing product consistency.

The utility model discloses a loading tray conveying and stacking device, and relates to the technical field of loading trays, the loading tray conveying and stacking device comprises a U-shaped seat, four corners of the bottom of the U-shaped seat are fixedly connected with supporting legs, a conveying belt is arranged in the U-shaped seat, and two limiting frames are arranged at the top of the U-shaped seat. The half gear is meshed with one rack, the sliding frame drives the other rack to move, the sliding frame extrudes the reset spring to conduct elastic compression, the other rack is meshed with the first gear, the first gear drives the threaded rod to rotate through the arrangement of the one-way damping bearing, and the threaded rod is in threaded connection with the connecting block. The connecting block can drive the lifting plate to move downwards, so that the tops of the carrying discs are flush with the top of the conveying belt, the carrying discs conveyed by the conveying belt can be sequentially stacked, and according to the structural design, multiple air cylinders are not needed, and the conditions that the carrying discs are fed to the conveying belt and the carrying discs are stacked can be completed.

The invention relates to the technical field of ball valves, and discloses a ball valve butt joint structure which comprises two ball valve assemblies in coaxial butt joint, each ball valve assembly comprises a valve body, a valve element and a valve rod, each valve element is movably arranged in the corresponding valve body, one end of each valve rod penetrates through the corresponding valve body and is fixedly connected with the corresponding valve element, and the other end of each valve rod extends out of the corresponding valve body and is sleeved with a gear. The butt joint end face of each valve body is provided with a rack extending in the circumferential direction, and the rack of one ball valve assembly can be meshed with the gear of the other ball valve assembly. A limiting pin is elastically connected into at least one valve body, a limiting hole matched with the limiting pin is formed in the butt joint face of at least another valve body, the limiting pin can move between a locking position and an unlocking position in the axial direction relative to the valve bodies, the limiting pin is inserted into the limiting hole in the locking position, and the limiting pin is disengaged from the limiting hole in the unlocking position. According to the ball valve butt joint structure, locking and opening of the two ball valve assemblies can be completed only through two actions, and operation is rapid and convenient.

The utility model provides a difunctional angle measuring instrument, which relates to the technical field of angle measuring instruments, and comprises a first graduated scale, one side of the first graduated scale is fixedly connected with a circular shaft, the outer ring of the circular shaft is rotatably connected with a second graduated scale, one side of the second graduated scale is provided with a first sliding chute, and the second graduated scale is provided with a second sliding chute. A first sliding groove is formed in one side of the first graduated scale, a second sliding groove is formed in the other side of the second graduated scale, angle scale marks are arranged on one side of the second graduated scale, a pointer is fixedly connected to one side of the first graduated scale, and one end of the pointer penetrates through the first sliding groove and points to the angle scale marks. Therefore, the rotating angle of the arc-shaped rack driven by the rotating gear is small, so that the effect of accurately adjusting the second graduated scale is achieved, the situation that the force is too large or too small during operation can be avoided, the measurement accuracy is improved, the angle measuring instrument is convenient to use, and the use effect is improved.

The utility model relates to the technical field of screening, and discloses an anti-blocking step-by-step screening device which is characterized in that when a control assembly is arranged and an output shaft of a motor drives a rotating rod and a rotating disc to rotate, latches fixed on the surface of the rotating disc abut against a second rack to move; a horizontal rod fixed to the surface of a second rack is stressed to transversely slide in two sets of protruding blocks, when the horizontal rod moves, a transverse rod fixed to the surface of the horizontal rod can drive a first rack to slide on the surface of a gear, and the gear is stressed to drive a round rod and a disc to rotate on the surface of a fixing plate; a stirring plate fixed to the surface of the disc can synchronously stir on the surface of the first screening plate, materials gathered on the surface of the first screening plate are stirred, and the materials are evenly distributed on the surface of the first screening plate, in this way, substances with different particle sizes can be separated more meticulously, the screening precision is improved, meanwhile, compared with a directly-arranged inclined filtering plate, the screening efficiency is improved, and the screening efficiency is improved. And the condition of local material accumulation can be avoided.

The utility model provides a mechanical running-in device for a circuit breaker, which relates to the technical field of mechanical running-in devices and comprises a workbench. The first motor is started, the first motor can drive the gear to rotate when working, the gear can drive the rack meshed with the gear to slide downwards in the sliding groove in the rotating process, and the rack can drive the L-shaped rod to slide downwards in the sliding groove in the downward sliding process; an L rod drives a connecting plate, a telescopic air cylinder and a poke rod to move downwards together in the downward sliding process, a first motor is turned off when the poke rod is moved to be flush with a switch of the circuit breaker, then the telescopic air cylinder is started, the telescopic air cylinder drives the poke rod to move in the working process, the poke rod pokes the switch of the circuit breaker in the moving process, and then the circuit breaker is started. The circuit breaker can be subjected to multiple times of running-in detection by repeatedly shifting the switch of the circuit breaker, the automatic running-in detection function of the circuit breaker is realized through the design, and manual operation in the detection process is effectively avoided.

The invention relates to the technical field of thermistor temperature measurement, in particular to a temperature measurement detection device for a thermistor, which comprises a substrate and a handpiece, a to-be-measured resistor is mounted on the outer side wall of the substrate, an inner cylinder is fixedly connected to the end part of the handpiece, a top magnetic block is fixedly connected to the interior of the inner cylinder, and a top magnetic block is fixedly connected to the top magnetic block. A probe switching mechanism is arranged in the inner cylinder and comprises a rotating rod rotationally connected into the inner cylinder, a gear is fixedly connected to the outer side wall of the rotating rod, a push rod is slidably connected to the inner cylinder, and a rack is arranged at the end of the push rod. When an operator presses down the handheld piece, the swing arm can synchronously drive the two cleaning pieces to move towards the two sides, the cleaning brush directly cleans the surface of the resistor to be measured, extra manual cleaning is not needed, obstruction of dust residues to heat conduction is effectively avoided, and a precise foundation is laid for subsequent temperature measurement.

The invention discloses a high-precision water pump pressure controller which comprises a pump box, a centrifugal impeller and an adjusting ring set. A bearing frame is arranged on one side of the pump box, a vortex tube and a lining plate are arranged on the surface of the pump box, a rotating speed sensor and a flow speed sensor are arranged on the inner side of the bearing frame and the inner side of the vortex tube respectively, a pressure sensor is arranged on the lining plate, and the output end of the sensor is electrically connected to a data processing module. The centrifugal impeller comprises a wheel seat, a sliding ring, centrifugal blades and a synchronous gear ring, and the centrifugal blades are meshed with a worm gear rack of the synchronous gear ring through transmission tooth grooves. The adjusting ring set comprises a sliding rod, a joint ring and a hand rotating ring and is used for controlling the synchronous gear ring to rotate so as to drive the centrifugal blades to deflect to adjust the exposed area of the centrifugal blades, and therefore dynamic adjustment of pressure output is achieved. The system can realize real-time monitoring and fusion analysis of parameters such as rotating speed, flow velocity and pressure, has the advantages of fast response, high adjustment precision, strong system stability and the like, and is suitable for a precise fluid conveying system.

The invention relates to the technical field of new energy automobile tension spring testing, and discloses a new energy automobile tension spring stability detection device, which comprises a mounting bracket arranged at the top of a supporting bottom plate, a tensile test mechanism arranged on one side of the mounting bracket, and a compression test mechanism arranged on the other side of the mounting bracket. According to the new energy automobile tension spring stability detection device, a transmission gear drives a transmission rack to perform lifting adjustment, a tension spring is conveniently and stably stretched, the tensile strength of the tension spring is further tested, and a hand and a forward and backward lead screw conveniently drive four spring clamping plates to perform telescopic movement through a nut seat; the clamping diameter of a spring clamping plate is flexibly adjusted, an electric air cylinder drives a spring top plate to press downwards, the spring top plate is connected with a spring sleeve rod through a limiting round hole, the tensioning spring is conveniently limited in the spring clamping plate to be compressed, the compression deformation degree of the tensioning spring is conveniently observed, and the compression strength of the tensioning spring is conveniently tested.

The invention relates to the field of robot additional shafts, in particular to an additional shaft servo motor type selection method for a robot, which comprises the following specific steps of: S1, determining a transmission system structure at a load end of an additional shaft motor; s2, determining a mechanical structure and motion characteristic parameters of the transmission system; s3, importing into a motor library; s4, performing calculation; s5, judging and checking; s6, model selection is completed; for three mainstream transmission systems of a gear rack, a ball screw and a belt at a load end of a robot additional shaft motor, calculation and accurate model selection are performed on parameters of the motor, and the dynamic response characteristic of the motor and the system compatibility of the model selection method are improved; the model selection tool can support a user to import and modify a motor database by himself / herself, and quickly and conveniently recommend an accurate model selection result from the motor database according to the rotation speed, torque, power and load inertia ratio judgment and check conditions of the motor, thereby improving the model selection efficiency of the servo motor and improving the user experience. And resource redundancy and manufacturing cost caused by a traditional empirical selection method are reduced.

The invention provides a vector nozzle, a multi-degree-of-freedom vector nozzle and an aircraft, the vector nozzle comprises a first air injection section, a second air injection section and a third air injection section, the first end of the first air injection section is provided with a convex ring; an annular groove is formed in the first end of the second air injection section; the rack and the driving gear are meshed with each other, the rack is fixed on the outer surface of one of the first air injection section and the second air injection section, and the driving gear is fixed on the outer surface of the other one of the first air injection section and the second air injection section through a base; the protruding ring is clamped in the annular groove, and at least one set of balls are arranged between a plurality of sets of faces, directly opposite to the annular groove, of the protruding ring. And a deflection angle exists between the axis of the air inlet and the axis of the air outlet of at least one of the first air injection section and the second air injection section. According to the vector nozzle, the air injection direction of an engine can be changed.

The invention discloses a disc type negative stiffness damper which comprises a base plate, a sliding block is fixedly installed on the base plate, and a rack-shaped sliding rail is horizontally installed on the sliding block in a sliding mode. A large gear and a small gear are rotationally installed on the base plate through a supporting structure, one position of the large gear is externally meshed with the small gear, the other position of the large gear is externally meshed with a rack on the sliding rail, the center of the small gear is fixedly connected with a small gear shaft, and a damper is further fixedly connected to the small gear shaft. A first connecting piece is arranged on the edge of the large gear, a second connecting piece is arranged on the base plate, the first connecting piece is connected with one end of a pretension spring, the other end of the pretension spring is connected with the second connecting piece, and the first connecting piece, the second connecting piece and the pretension spring form a negative stiffness mechanism. The negative stiffness effect is generated by the pre-tensioning spring, and compared with a pre-pressing spring, the pre-tensioning spring cannot be bent; and meanwhile, compared with the magnetic negative stiffness, the magnetic negative stiffness has a larger stroke.

The invention discloses an inspection robot based on property security, and relates to the technical field of inspection robots. Comprising a main body, a buffering assembly is arranged on one side of a buffering plate, an angle adjusting assembly is arranged on one side of a gear, a rotating seat is arranged on one side of the angle adjusting assembly, a stabilizing assembly is arranged at the bottom of the rotating seat, and balance weight balls are arranged on the two sides of the stabilizing assembly. The rack drives a bidirectional screw rod to rotate through meshed gears, the bidirectional screw rod drives a first moving plate and a second moving plate to move bidirectionally, fixed blocks which are arranged on the outer walls of a first connecting rod and a second connecting rod in a staggered mode move to drive a rotating rod which is rotationally connected to move bidirectionally, and then a rotating seat is driven to rotate; the balance weight pressure is increased towards the rear wheels, the positive pressure of the rear wheels is improved, then the road holding force is increased, and uphill interruption or backward sliding is prevented.

The full-automatic laser cutting machine for pipe machining comprises a base frame and a laser cutting head, the top of the base frame is slidably connected with a movable frame, the interior of the movable frame is rotatably connected with a rotating ring, the outer side of the rotating ring is fixedly connected with two first electric push rods, and the number of the first electric push rods on the rotating ring is two. Belongs to the technical field of laser cutting machines. According to the full-automatic laser cutting machine for pipe machining, a first electric push rod is started, the first electric push rod drives pressing plates to move in the direction close to a pipe through a mounting frame, for a special-shaped pipe, when one pressing plate abuts against the special-shaped pipe, a rack on the corresponding side cannot continue to move, and along with the continuous approaching of the mounting frame, the rack is driven to move; under the action of the rack on the side, the first gear can rotate, the first gear can drive the rack on the other side to approach the special-shaped pipe till the pressing plate on the rack on the other side abuts against the special-shaped pipe, and therefore the purpose of clamping and fixing the special-shaped pipe is achieved.

Sealing plates are detachably installed at the two ends of a lower frame and the two ends of an upper frame, a vertical frame is fixedly installed between the lower frame and the upper frame, an extension rod on one side is pushed to slide, then a rack slides in the upper frame, meanwhile, the rack drives the other rack to slide through a gear in the middle, and the two racks are folded at the same time; the other end of the rack compresses the spring, the rack can drive the sliding rod to slide in the arc-shaped hole through the limiting strip while sliding, then the clamping base, the clamping rod and the lock rod rotate with the hinge point of the clamping rod and the transverse frame as the circle center, the lock rod rotates to extrude the lock head, the lock head rotates around the hinge point of the lock head, and after the lock rod crosses the lock head, the lock head is locked. The lock head falls under the influence of self weight, the bottom of the lock head stops the lock rod from rotating reversely to return, in the process, the extending rod is pushed on one side, the multiple sets of clamping rods can be rotated and erected, and the clamping rods do not need to be straightened one by one by personnel.

The invention relates to the technical field of gear assembly welding, in particular to a gear assembly welding device which comprises a fixed base, laser welding equipment is fixedly installed on the fixed base, two movable seats are symmetrically arranged on the fixed base in a sliding fit mode, and positioning rings are installed on the movable seats. A key groove positioning mechanism is rotatably connected to the positioning ring, a gear shaft is arranged in the middle of the positioning ring, a preheating plate is rotatably connected to the movable seat, an auxiliary smearing mechanism is rotatably connected to the fixed base, and by arranging the preheating plate, the welding end of the gear shaft is preheated while being limited. And when the two gear shafts are pushed to be close to be welded, the preheating plate can be automatically driven to move away under the action of the fixed racks. The welding quality can be improved, meanwhile, manual intervention is reduced, and the operation efficiency and the production precision are improved. The method has the remarkable advantages of reducing thermal stress, improving the strength and toughness of a welded joint, reducing deformation and the like.

The invention belongs to the technical field of bridge construction, and particularly relates to a single-point multiple-jack synchronous beam falling forced displacement method prestress applying method which comprises the steps that S1, a plurality of temporary supporting points are arranged beside a permanent support, and a self-locking type beam bearing mechanism is installed on each temporary supporting point; meanwhile, a hydraulic jack is arranged at each temporary supporting point, the multiple hydraulic jacks are connected to a PLC integrated hydraulic synchronous control system through hydraulic pipelines, and synchronous linkage mechanisms are arranged among the multiple hydraulic jacks. According to the single-point multiple-jack synchronous beam falling forced displacement method prestress applying method, when an inner jacking pipe sleeve pushes a supporting cushion block to ascend and descend, through meshing of a self-locking gear and two self-locking racks, a secondary telescopic block can be forcibly driven to move synchronously, so that continuous stretching and retracting of a bearing beam are achieved, the cushion block does not need to be manually replaced after single beam falling, and the working efficiency is improved. The system automatically adjusts the height to meet the multi-stroke circulating beam falling requirement, and the construction efficiency is improved.