491 results about "Bilateral symmetry" patented technology

The invention discloses a new energy automobile battery tray welding anti-deformation auxiliary supporting device, and relates to the technical field of new energy automobile battery trays, the new energy automobile battery tray welding anti-deformation auxiliary supporting device comprises a reference frame, L-shaped clamping seats, self-adaptive limiting mechanisms, elastic pressing mechanisms and supporting legs, the four L-shaped clamping seats are fixedly connected to the four corners of the top end of the frame, and the two self-adaptive limiting mechanisms are in front-back symmetry; the two elastic pressing mechanisms are in bilateral symmetry, the self-adaptive limiting mechanism comprises three telescopic columns, column bodies are fixedly connected with guide limiting plates, belleville spring sets are arranged between the plates and the frame, buffer rubber cakes are installed on the outer sides of the plates, and the two ends of the plates are connected with reinforced L-shaped brackets through magnetic assemblies. The supporting legs are inserted into four corners of the frame to be locked and fixed; according to the device, all-directional constraint is achieved through cooperation of multiple mechanisms, welding thermal stress is offset in a self-adaptive mode, deformation and scratch are prevented, and the welding precision is improved.

The invention discloses a low-noise motor rotor dynamic balance detection device, and particularly relates to the technical field of automobile part detection, the low-noise motor rotor dynamic balance detection device comprises a detection table and supporting plates arranged at the upper end of the detection table in a bilateral symmetry manner, and the inner surfaces of the two supporting plates are jointly provided with rotor fixing structures distributed in a bilateral symmetry manner; driving structures used for driving a motor rotor to rotate are arranged at the upper end of the detection table in a bilateral symmetry mode, and an eccentricity detection structure used for detecting the rotation eccentricity and the vibration frequency of the rotor is arranged in the middle of the upper end of the detection table. Rotor noise is effectively isolated through the shielding cover to ensure detection accuracy, automatic centering and stable clamping of the rotor are achieved through cooperation of the clamping assembly and the driving assembly of the rotor fixing structure, and accurate positioning and low-friction driving of the rotor are completed through cooperation of the positioning assembly and the locking assembly of the driving structure. Vibration and eccentricity data are acquired in a multi-dimensional manner by combining a contact wheel of an eccentricity detection structure and a sensor array, and high-precision comprehensive detection of dynamic balance of the rotor is finally realized.

The utility model belongs to the technical field of computer production testing, and particularly relates to a computer button durability testing device which comprises a vertical plate and a counting assembly, a base assembly is arranged at the bottom of the vertical plate, a fixing block is fixed in the middle of the rear outer wall of the bottom end of the vertical plate, and positioning knobs are in threaded connection with the rear outer wall of the bottom end of the vertical plate in a bilateral symmetry mode. A driving motor is fixedly installed on the outer wall of the middle of the rear portion of the vertical plate, an oval block is fixedly connected to the output end of the driving motor, a counting assembly is fixedly installed in front of the top of the vertical plate, guide rods are fixed to the outer wall of the front portion of the vertical plate in a bilateral symmetry mode, and movable plates are symmetrically arranged on the outer sides of the upper end and the lower end of each guide rod in a sliding mode; a spring is arranged on the outer side of the middle of the guide rod, and the two ends of the spring are fixedly connected with the two movable plates correspondingly. According to the utility model, the pressing column and the isolation plate are synchronously adjusted, so that the counting accuracy can be ensured, the condition of excessive reading or insufficient reading is avoided, and the reliability of a test result is higher.

The utility model relates to the field of sheet metal processing, and discloses a bending device for sheet metal processing, which comprises a base, the top of the base is fixedly connected with a support frame, the inside of the support frame is fixedly connected with two hydraulic push rods which are distributed in bilateral symmetry, the bottoms of the two hydraulic push rods are both fixedly connected with a fixed frame, and the two hydraulic push rods are fixedly connected with the fixed frame. A rotating device is arranged in the fixing frame, the outer side of the rotating device is in transmission connection with a connecting plate through threads, a mounting plate is fixedly connected to the bottom of the connecting plate, a bending knife is fixedly connected to the interior of the mounting plate through a fastener, and a second sliding plate is slidably connected to the interior of the base; the top of the second sliding plate is fixedly connected with a fixing rod through a fastener, wherein the fixing rod penetrates through and extends to the outer side of the base. The bending device for sheet metal machining has the beneficial effects that the position of the bending knife or the position of the pressing die base can be relatively adjusted, and the adjusting mode is simple and rapid.

The utility model belongs to the technical field of track plate laying and pouring, and discloses a ballastless track plate laying and pouring construction crane which comprises a pouring stock bin, a movable door frame, a traction mechanism and a hoisting and clamping mechanism. The traction mechanism comprises a traction main frame, a traction hydraulic cylinder, a steel cable limiting winding column and a steel cable, one end of the steel cable is wound at the telescopic end of the traction hydraulic cylinder, and the other end of the steel cable bypasses the corresponding steel cable limiting winding column and then is vertically downwards connected with corresponding lifting lugs at four corners of the lifting clamping mechanism; the lifting clamping mechanism comprises a lifting main frame, a clamping hydraulic cylinder located in the middle and extending longitudinally and horizontally, clamping connecting longitudinal rods arranged in a bilateral symmetry mode, and clamping seats which are in bilateral mirror symmetry and connected with the clamping connecting longitudinal rods on the corresponding sides, and the clamping connecting longitudinal rods are hinged to the two ends of the clamping hydraulic cylinder through V-shaped oil cylinder connecting frames; the utility model has the advantages of automatic control clamping and loosening, simple and fast operation, stable clamping, stable hoisting and the like.

The utility model discloses an impact block and rotor pressing device for electric hand drill production, which comprises a bearing, the two supporting columns are fixedly arranged at the top of the workbench in a bilateral symmetry mode, the transverse plate is fixedly arranged between the tops of the two supporting columns, and the four vertical rods are fixedly arranged at the top of the workbench in a front-back symmetry mode and located on the outer side of the transverse plate. The transverse plate is arranged on the top of the workbench, the sliding pushing assembly is arranged on the top of the workbench in a sliding mode and located on the lower side of the transverse plate, the placing plate is arranged on the sliding pushing assembly and located on the upper side of the transverse plate, the positioning inserting cylinder is fixedly arranged on the top of the transverse plate and located on the right side of the placing plate, and an impact block body can be placed on the placing plate. And a rotor body can be inserted into the positioning insertion hole.

The application discloses a drill rod external thread drill tail machining positioning device, which comprises a walking frame and a walking mechanism arranged on the walking frame, a base bottom plate is slidably arranged on a workbench of the walking mechanism, a vertical support is arranged on the base bottom plate, the vertical support is provided with an obliquely arranged sliding groove, a drill rod positioning piece is arranged in the sliding groove, the drill rod positioning piece comprises an adjusting positioning block, an adjusting pivot and a drill rod clamping seat, the end of the adjusting positioning block is a square groove, and the drill rod clamping seat is arranged in the square groove, the coaxiality of the adjusting pivot and the central mounting ring ensures the stability of rotary adjustment and the repeat positioning precision, the replaceable drill rod clamping seat is matched with the middle sleeve to adapt to drill rods of different specifications, and the universality of the device is improved; the anti-shaking assembly arranged in a bilateral symmetry mode is introduced, the central adjustment is ensured, the clamping seat is kept coaxial with the main shaft of the machine tool at all times, and the deviation or vibration problem caused by eccentricity in the machining process is effectively prevented.

The utility model relates to the field of automation, in particular to an adjustable motor screw heading device. The utility model provides an adjustable motor screw heading device which comprises a cabinet, a screw heading machine, an electric turntable, a mounting frame, a screw rod, a guide rod and the like, the screw heading machine is mounted at the top of the cabinet, the electric turntable is mounted at the top of the cabinet, the mounting frame is mounted at the top of the cabinet, and the screw rod is rotatably connected in the mounting frame. Guide rods are connected to the mounting frame in a bilateral symmetry mode. The guide ring can be adjusted to the position suitable for the size of a workpiece through the lead screw, so that the clamping distance of the fixing frames is accurately adjusted, then in the rotating process of the electric rotating disc, the second rolling wheel makes contact with the inclined face of the guide ring, and the two fixing frames automatically move towards the inner side through the synergistic effect of the guide ring, the first rolling wheel and the second rolling wheel; the workpiece is firmly clamped, the stability and precision of the workpiece in the screw driving process are ensured, manual intervention is not needed, and the automation level and the operation efficiency are improved.

The utility model provides an electric wheelchair which comprises an upper support assembly and a lower support assembly which are connected with each other, the upper support assembly comprises a chair back and a seat cushion used for loading, and the lower support assembly is used for supporting a connecting wheel set. Two vertical chair back shock absorbers are connected between one side of the chair back in the upper bracket assembly and the lower bracket assembly in a bilateral symmetry manner; two vertical seat cushion shock absorbers are connected between the lower part of one side, deviating from the chair back, of the seat cushion and the lower bracket assembly in a bilateral symmetry manner; a pair of front wheel frames are connected to the lower support assembly on one side of the seat cushion shock absorber in a bilateral symmetry mode, front wheel shock absorbers are arranged at the connecting positions of the front wheel frames and the lower support assembly, shock absorption distribution of the connecting positions of the wheelchair frame is optimized, compared with the prior art, the number of the shock absorbers is increased, the shock absorbers are arranged at the main stress positions of the wheelchair frame, and therefore shock absorption of the wheelchair is improved. The shock absorbers are distributed on the wheelchair frame more densely, and the shock absorption effect of the wheelchair is effectively improved.

The utility model relates to the technical field of wastewater treatment, and particularly discloses a precipitation device. Comprising a settling box, a mixing cylinder and a motor, supporting blocks are fixedly connected to the upper surface of the settling box in a bilateral symmetry mode, the mixing cylinder is fixedly connected to the top of the settling box through the supporting blocks, a filtrate pipe is connected between the mixing cylinder and the settling box in a penetrating mode, and a machine cover is fixedly connected to the top of the mixing cylinder; an output shaft of the motor is fixedly connected with the rotating shaft. The settling tank has the following beneficial effects that the filter frame is arranged in the settling tank, so that sediments generated in a wastewater reaction can conveniently sink into the filter frame and wait for being uniformly pulled away by a worker to be cleaned; a cleaning plate is arranged on a rotating shaft, and the rotating shaft rotates to drive a cleaning brush to rotate, so that the inner wall of the mixing barrel is cleaned.

The utility model discloses a motor processing laser cladding device which comprises a workbench, the top side of the workbench is fixedly connected with a fixing frame, the inner side of the fixing frame is rotatably connected with a rotating arm, the fixing frame and the rotating arm are both distributed in a bilateral symmetry mode about the bisector of the workbench, and a first motor is installed on one side of the fixing frame. A motor shaft body is clamped on the inner side of the rotating arm, a laser welding head is arranged at the top of the motor shaft body, a reciprocating ball screw is arranged at the bottom of the motor shaft body, two mounting frames are fixedly connected to the reciprocating ball screw, and a first cleaning assembly and a second cleaning assembly are arranged on the inner sides of the two mounting frames correspondingly; the first cleaning assembly and the second cleaning assembly are the same in structure. The second cleaning assembly comprises a splicing block rotationally connected with the mounting frame, and the splicing block is of an arc-shaped structure. According to the device, the motor shaft body can be uniformly and thoroughly cleaned, so that the cleanliness of the surface of the motor shaft body during cladding is guaranteed, and the cladding effect of the motor shaft body is guaranteed.

The utility model discloses a through netlike inhaul cable large-span arch bridge design and construction device which comprises a bridge floor, arch ribs and air cylinders, the arch ribs are arranged on the bridge floor in a bilateral symmetry mode, straining beams are correspondingly arranged on the left side and the right side of the bridge floor, a plurality of inhaul cables are arranged between the straining beams and the arch ribs, the inhaul cables are crossed to form a netlike structure, and the air cylinders are detachably arranged on the tops of the straining beams. The driving end of the air cylinder is connected with the bottom of the inhaul cable which is telescopic through the air cylinder. A plurality of air cylinders are installed at the top end of the straining beam, the air cylinders are connected with the tail ends of the inhaul cables to stretch out and draw back the inhaul cables, the inhaul cables stretch out and draw back to adjust pulling force between the arch rib and the straining beam, a better stable structure is achieved, and installation is convenient and fast. The fixed seat of the cylinder is detachably combined, so that the maintenance, assembly and disassembly are convenient, and daily maintenance is convenient; end cross beams are arranged at the front end and the rear end of the bridge floor, cross-shaped cross beams and longitudinal beams are arranged in the middle, and orthogonal special-shaped plates are poured, so that the bridge floor is stable and does not need to be supported by bridge piers; the device is novel in structure, high in practicability and suitable for popularization.

The utility model discloses a slope-adjustable walking machine which comprises a walking machine body, rotating grooves are formed in the bottom end of the front portion of the walking machine body in a bilateral symmetry mode, slope adjusting assemblies are rotationally connected into the two rotating grooves, and two supporting legs are fixedly connected to the bottom end of the rear portion of the walking machine body. The left side wall and the right side wall of the walking machine body are rotationally connected with a rotating frame, a control screen is fixedly installed at the front end of the rotating frame, limiting grooves are symmetrically formed in the side wall of the rotating frame, and limiting mechanisms are symmetrically arranged on the left side wall and the right side wall of the walking machine body. The gradient adjusting assembly adjusts the height of one end of the walking machine, and the height of the other end of the walking machine is not changed, so that the walking machine body forms a slope surface and can be freely adjusted, and the walking experience of a user in different environments is met; and through the arrangement of the rotating frame, the limiting mechanism and the limiting groove, the walking machine can be folded, the occupied space is reduced after folding, and storage is convenient.

The utility model belongs to the technical field of water conservancy construction equipment, and relates to concrete pouring equipment for water conservancy dam project construction, which comprises a hanging tank body, a hanging frame is welded on the outer side wall of the hanging tank body, and a tank cover capable of being opened and closed is arranged at the top of the hanging tank body; the tank cover is composed of two cover plates which are symmetrically arranged left and right, the two cover plates are hinged to the top end of the hanging tank body, and the two cover plates are opened and closed in a rotating mode; the left side and the right side of the hanging tank body are provided with connecting rod mechanisms used for controlling the cover plate to be opened and closed correspondingly, and the two connecting rod mechanisms are arranged in a bilateral symmetry mode along the central axis of the hanging tank body. The connecting rod mechanism comprises a balance weight seat, a vertical rod, a first connecting rod, a second connecting rod, a sliding sleeve, a sliding rod and a third connecting rod. The tank cover capable of being automatically opened and closed is arranged at the top of the hanging tank body of the pouring equipment, workers do not need to turn over to open and close the tank cover, the automatic opening and closing structure of the tank cover can save time and labor, and the falling risk caused when the workers control the tank cover on a cliff can be avoided.

The utility model relates to the field of lifeboat renovation, in particular to a lifeboat shell supporting tool which comprises a frame, at least one set of keel supporting frames and at least two sets of shell supporting frames are arranged on the frame, and the keel supporting frames are located between the two sets of shell supporting frames. Gaskets are detachably arranged on the keel support frame and each group of shell support frames respectively; and a plurality of universal wheels are arranged at the bottom of the frame. Each group of keel support frames comprises two keel support frames, and the two keel support frames are respectively arranged on the frame in a bilateral symmetry manner; each set of shell supporting frames comprises two shell supporting frames, and the two shell supporting frames are arranged on the frame in a bilateral symmetry mode. According to the utility model, the working efficiency of lifeboat renovating is improved.

The utility model discloses a novel hair erecting machine saddle which is characterized in that a hollow cavity is machined in the front side face of a saddle block body, a vertical sliding groove is machined in the rear side wall of the cavity, a first vertical guide rail is machined on the left side wall of the cavity, and a second vertical guide rail is machined on the right side wall of the cavity. The first vertical guide rail and the second vertical guide rail are arranged in a bilateral symmetry mode, a vertical guide hole is machined in the top wall of the cavity, and the vertical guide hole penetrates upwards from the cavity to the top face of the seat block body. The mounting height of the mountain angle can be flexibly adjusted.

The utility model relates to the field of insulators, in particular to a ceramic insulator for a high-low voltage power transmission line, which comprises an insulator and a chassis, the bottom of the insulator is provided with the chassis, the upper end face of the chassis is provided with through holes in a front-back symmetrical manner, the upper end face of the chassis is provided with a fixing groove, and the left end face in the fixing groove is rotatably provided with an adjusting lead screw through a bearing. Adjusting sliding blocks are installed on the outer side wall of the adjusting lead screw in a bilateral symmetry mode, a fixing plate is installed on the upper end face of each adjusting sliding block, a plurality of limiting frames are installed at the inner side end of each fixing plate from top to bottom, and a fixing screw rod is installed at the bottom of the base plate. And the limiting frame is used for clamping and fixing the winding part, so that the winding and mounting stability is ensured, and the phenomenon that the binding rope is easy to break and fall off after being used for a long time during binding rope fixing is avoided.

The utility model discloses a portable bred cattle transporting device which comprises a bottom plate, a collecting chamber is arranged on the upper side of the bottom plate, a supporting plate is arranged on the inner side of the collecting chamber, and a bearing plate is installed on the inner side of the supporting plate. The connecting block is arranged on the outer side of the bottom plate, a collecting structure is arranged in the bottom plate, reinforcing ribs are arranged on the lower side of the bearing plate, a bearing partition plate is arranged on the inner side of the bearing plate, a connecting block is installed on the upper side of the supporting plate, and a connecting bolt is connected to the inner side of the connecting block. The connecting blocks are arranged in a bilateral symmetry mode about the center line of the collecting chamber. According to the portable breeding cattle transportation device, the breeding cattle transportation device is designed in a split mode, the problem that the occupied space is too large when the breeding cattle transportation device is not used is effectively solved, portable transportation of the breeding cattle transportation device is improved, meanwhile, manure of breeding cattle is collected in a unified mode through the breeding cattle transportation device, and the breeding cattle transportation device is convenient to use. And the tidiness of the bred cattle transportation device during use is effectively improved.

The utility model discloses a Song charm teapot door couch with a reinforced frame structure, which comprises a first frame, a core plate, two carved tooth plates, a second frame and a tincture, the core plate is embedded in the first frame, the tops of the two carved tooth plates are inserted into the bottom of the first frame through connecting insertion rods, and the second frame is connected with the second frame through connecting insertion rods. The two carved tooth plates are distributed at the bottom of the core plate in a bilateral symmetry mode, the second frame is inserted into the bottoms of the two carved tooth plates through the connecting insertion rods, and the Toney is connected to the bottom of the second frame through the square tenons. The carved tooth plate and the first frame are connected through the square tenons, the joists are connected to the second frame through the square tenons, so that a stable frame structure is integrally formed, the longitudinal middle columns and the transverse middle columns are arranged at the bottom of the core plate, the middle supporting force is enhanced, and the stability and the structural strength under the large scale are integrally guaranteed; the service life is prolonged, and the practicability is high.

The utility model relates to a screening device, and provides the plastic particle screening device which comprises an equipment shell, a layered support, a connecting frame and the like. A top cover is fixedly arranged on the upper portion of the interior of the equipment shell, a feeding port is formed in the right portion of the top cover, layered supports are arranged on the front side and the rear side of the top cover in a bilateral symmetry mode, and a plurality of connecting frames are arranged on each layered support in an up-and-down mode. The multiple screens are arranged in a layered mode, each screen is independently controlled through the multiple vibration modules arranged on the screen, vibration between the screens is not conducted mutually, the defect that in a traditional unified control mode, the single vibration frequency cannot meet diversified screening requirements is effectively overcome, the screening efficiency and accuracy are greatly improved, and the screening quality is improved. And meanwhile, the problems of material blockage, screen mesh damage and the like caused by mutual influence of vibration between screen meshes are reduced, the equipment energy consumption and the maintenance cost are reduced, and the overall performance and reliability of the plastic particle screening device are remarkably improved.

The utility model relates to the technical field of parking equipment, in particular to a centering and clamping device for intelligent parking, which can center a vehicle, ensure that the vehicle is accurately parked at a designed position, ensure that the vehicle is parked correctly and realize the maximum utilization rate of space. Comprising a base and a centering mechanism, two sets of parking frames are fixedly connected to the base in a bilateral symmetry mode, the parking frames and the base are integrally formed, two sets of lug plates are symmetrically and fixedly arranged on the outer sides of the two sets of parking frames, two sets of sinking grooves are symmetrically formed in the two sets of parking frames, and multiple sets of rollers are rotatably arranged in the sinking grooves at equal intervals; the sliding seats are slidably mounted on the sliding rails through matching of the sliding grooves, two notches are symmetrically formed in each of the two sides of the base, four sets of guide plates are slidably arranged on the base through matching of the notches, centering plates are fixedly arranged on the outer sides of the guide plates, two sets of transmission battens are symmetrically hinged to the two sets of sliding seats, and the other ends of the transmission battens are hinged to the inner sides of the guide plates.

The utility model provides a protection device for mine goaf filling equipment. The protection device comprises a buffering structure, a sliding rod structure, two arch-shaped supporting structures, two adjustable bases and four lifting supporting devices. The two arched supporting structures are arranged in a bilateral symmetry mode, the two adjustable bases are arranged at the bottoms of the two arched supporting structures in a front-back symmetry mode, each adjustable base is connected with the two arched supporting structures, and the two lifting supporting devices are symmetrically arranged below each adjustable base. The protective device for the filling equipment in the mine goaf solves the problems that due to the fact that a pipeline of the filling equipment in the related technology is not provided with an external protective structure, the pipeline is prone to being broken and abraded due to goaf collapse, falling stone impact or rock stratum dislocation.

The utility model relates to an ultrahigh-voltage switch shell turnover device which comprises a working table, and a first turnover mechanism and a second turnover mechanism are arranged on the working table in a bilateral symmetry mode. Each of the first turnover mechanism and the second turnover mechanism comprises a bracket, a rotating shaft rotationally connected with the bracket, a supporting seat fixedly connected to one end of the rotating shaft and a bidirectional telescopic cylinder fixedly connected to the supporting seat, two telescopic rods of the bidirectional telescopic cylinder are fixedly connected with top blocks, and a motor for driving the rotating shaft to rotate is fixedly arranged on the bracket; the first turnover mechanism is fixedly arranged on the workbench, the second turnover mechanism slides on the workbench, and a first driving mechanism for driving the second turnover mechanism to slide in the left-right direction is arranged on the workbench. The shell is tightly supported and fixed through the first turnover mechanism and the second turnover mechanism and is driven to turn over, the bottom of the shell is supported through the supporting assembly, turnover stability is improved, use is convenient, time and labor are saved, and machining efficiency is improved.

The utility model discloses a combined type enclosure for bridge foundation pit construction, including the enclosure main part and the first support post and the second support post of bilateral symmetry arrangement of its both sides are equipped with support assembly in support post bottom, are equipped with connecting assembly in both sides. The linkage of connecting assembly through mounting panel, connecting plate, connecting rod, eccentric extrusion round block and curved handle realizes the quick joint fixing of adjacent enclosure, need not bolt and can adapt to the inclined installation. Support assembly adopts rotatable support rod cooperation ground fixed backing pad, and the anti-overturning ability of enclosure is enhanced. The enclosure innovatively solves the problem that the traditional enclosure installation is complicated and difficult to align, and significantly improves the assembly efficiency through the clamping type connecting structure, and effectively improves the overall stability with the adjustable support system, and the support rod can be stored design takes into account the use convenience, especially suitable for the bridge foundation pit construction scene that needs to be quickly built, with the advantages of reasonable structure, simple operation, good stability.

The invention provides a large-angle variable-dip-angle groove type carrier roller set which comprises a bottom frame, a center carrier roller and side carrier roller assemblies, the center carrier roller is horizontally installed in the middle of the bottom frame through a bearing plate, and the side carrier roller assemblies are arranged on the two sides of the bottom frame in a bilateral symmetry mode; the side carrier roller assembly comprises a side carrier roller and an adjustable supporting arm, the side carrier roller is rotatably installed on the adjustable supporting arm, the lower portion of the adjustable supporting arm is installed on the bottom frame through bolts, the side face of the bottom frame and the lower portion of the adjustable supporting arm are each provided with a plurality of bolt via holes, and the bolts penetrate through the different bolt via holes to install the adjustable supporting arm. The side carrier rollers can form different inclination angles relative to the bottom frame, and the stability of the side carrier rollers at different inclination angles can be ensured.

A waist rest comprises a back plate and at least one supporting assembly arranged on the back plate, each supporting assembly comprises a cross beam and two supporting plates, the two supporting plates are arranged on the cross beam in a bilateral symmetry mode through elastic assemblies, the cross beam is arranged on the back plate in an up-down moving and adjusting mode, a sliding rail extending up and down is arranged on the front face of the back plate, and the cross beam is in sliding fit with the sliding rail. A locking mechanism is arranged on the cross beam, a plurality of locking holes which are arranged at intervals in the length direction of the sliding rail are formed in the sliding rail, the locking mechanism comprises locking pins which can be inserted into or separated from the locking holes, and when the locking pins are inserted into the locking holes, the vertical movement of the cross beam can be limited; when the locking pin is separated from the locking hole, the cross beam can move up and down, the two supporting plates used for supporting the waist and the back of the human body are symmetrically arranged on the cross beam, the cross beam is connected with the back plate in an up-down moving mode through the sliding rail and the locking mechanism, and therefore the heights of the two supporting plates can be adjusted at the same time.

The utility model relates to a cutting machine, in particular to a protective circuit board cutting machine. Comprising a shell, a connecting plate, a two-way threaded rod, fixing blocks, a rotating motor, a moving frame, bolts and clamping plates, the connecting plate is connected to the lower side in the shell, a through groove is formed in the front side of the connecting plate, the rotating motor is arranged on the front side of the bottom end of the connecting plate, the fixing blocks are arranged at the bottom end of the connecting plate in a bilateral symmetry mode, and the two-way threaded rod is rotationally connected between the two fixing blocks; one end of the two-way threaded rod is connected with an output shaft of the rotating motor, the left side and the right side of the two-way threaded rod are in threaded connection with movable frames, screw holes are formed in the top ends of the movable frames, bolts are in threaded connection in the screw holes, and clamping plates are connected to the bottom ends of the bolts. According to the circuit board cutting machine, the movable frame is designed, so that a worker does not need to hold a circuit board by hand for cutting, manual intervention is reduced, and the operation risk is greatly reduced.

The utility model discloses a plank bed which comprises a headboard and a footboard, bed side plates which are symmetrically arranged left and right are arranged between the footboard and the headboard, a supporting beam is arranged between the bed side plates, one end of the supporting beam is connected with the headboard, and the other end of the supporting beam is connected with the footboard. A plurality of bed panels which are arranged at intervals in the length direction of the supporting beams are laid on the supporting beams, the bed panels horizontally extend left and right, the bed panels are further erected on bed side plates, positioning grooves for embedding one ends of the bed panels are formed in the bed side plates in a digging mode, and braids which can be bent at will are connected between every two adjacent bed panels; the braids are arranged between the two adjacent bed panels in a bilateral symmetry mode. The plank bed has the advantages of being convenient to assemble and easy to load and transport, and is complete in overall function and high in practicability.

The utility model relates to the technical field of overhead working trucks, and discloses an overhead working truck telescopic arm, a cantilever and an overhead working truck, the overhead working truck telescopic arm comprises an upper structure and a lower structure which are in butt joint up and down to form a closed contour, and the upper structure and the lower structure are both in bilateral symmetry; the upper structure is of an integrally-formed plate-shaped structure, the cross section of the upper structure comprises a first section, a second section, a third section, a fourth section, a fifth section, a sixth section and a seventh section which are sequentially connected, and the lower structure is of an integrally-formed plate-shaped structure. The cross section of the lower structure comprises an eighth section, a ninth section, a tenth section, an eleventh section, a twelfth section, a thirteenth section, a fourteenth section, a fifteenth section and a sixteenth section which are connected in sequence, the eighth section is in butt joint with the first section, and the sixteenth section is in butt joint with the seventh section. The structure strength is high, bending resistance and torsion resistance are excellent, cost is low, machining is convenient, and the space utilization rate is high.

The utility model discloses a traction patch for crissum surgery. The traction patch comprises traction assemblies which are in bilateral symmetry. The sticking piece is composed of a release paper layer, a sticking layer made of acrylic ester sticking materials, a polyurethane middle layer, a soft rubber reinforcing layer and a nylon outer coating layer, and the sticking layer can be torn and replaced. The outer covering layer is provided with three traction belts made of flat elastic bands, the upper traction belt and the lower traction belt are tightened and fastened on the fixing rod for standby traction, the middle traction belt is connected with an air bag, the air bag is connected with a pedal type air pump through an air pipe and used for inflation traction and capable of accurately adjusting force, and notches are formed in all the layers so that drainage can be facilitated. The traction patch can accurately and stably draw crissum tissue, enables the operation view to be completely exposed, is controllable in exposure range, reduces operation interference and tissue damage, has a reliable standby traction mode, can reduce cost, guarantees sanitation and safety, effectively improves the quality and safety of crissum operation, and promotes postoperative recovery of a patient.