185results about How to "Realize stepless adjustment" patented technology

A rigid-flexible coupling type turnout damping fastener system comprises an iron base plate, an under-plate elastic cushion layer, a heightening base plate, an elastic rail brace, eccentric bushings and an under-rail elastic base plate, the eccentric bushings are inserted into oblong holes in the two ends of the iron base plate and the two ends of the under-plate elastic cushion layer, and turnout tie bolts penetrate through the eccentric bushings and then are fixed to a turnout tie; the under-plate elastic cushion layer is formed by compounding low-rigidity and high-rigidity materials, the elastic rail brace is in elastic contact with a steel rail, the track gauge is adjusted by rotating the eccentric sleeve by 180 degrees, and the transverse rigidity of the fastener system is increased through the elastic rail brace; the fastener system has small vertical rigidity and large transverse rigidity, it can be ensured that the fastener system can provide enough vibration reduction elasticity for the steel rail in the vertical direction, meanwhile, the vertical displacement can be controlled within the design range, and therefore the stability of the steel rail and the running smoothness of a train are improved; and on the other hand, the mutually assembled parts of the fastener system are designed according to the rigid-flexible coupling contact relation of metal and nonmetal, so that the impact vibration of a train on the steel rail can be buffered.

The invention relates to an engine braking stepless regulation method, device and equipment and a medium, and belongs to the technical field of engine braking. The method comprises the steps that a negative torque request and basic driving data sent when a vehicle is braked are obtained, and the required negative torque is determined according to the negative torque request; according to the basic driving data and the required negative torque, the engine braking starting state is determined; when the engine braking starting state is starting, and engine braking of the vehicle does not meet the required negative torque, a pneumatic supercharger is adjusted, and first engine braking torque is obtained; when the first engine braking torque meets the required negative torque, stepless adjustment of engine braking is completed, and the braking effect can be improved through engine braking and adjustment of a pneumatic supercharger; the engine braking torque of the vehicle is controlled according to the required negative torque, continuous and variable torque adjustment can be carried out, and then stepless adjustment of engine braking is achieved.

The invention discloses a flexible bendable LED display screen, and relates to the technical field of LED module technologies, the flexible bendable LED display screen comprises a frame assembly, a support assembly and an LED display screen; the frame assembly comprises a first frame and a second frame, and the second frame is rotationally connected with the first frame through a connecting mechanism; the supporting assembly is arranged on one side of the frame assembly, and the first frame and the second frame rotate relatively to change the form of the supporting assembly; the LED display screen is arranged on the side, away from the frame assembly, of the supporting assembly, and the LED display screen can be bent along with the shape change of the supporting assembly. According to the technical scheme provided by the invention, the first frame and the second frame which are rotatably connected are arranged in the frame assembly in the flexible bendable LED display screen, so that the supporting assembly can drive the LED display screen to be bent as required, and the flexible bendable LED display screen can realize stepless adjustment of the LED display screen through the connecting mechanism; therefore, the flexibility of the flexible bendable LED display screen can be adjusted more flexibly.

The utility model discloses a launching rack which comprises a launching platform (31), a rear supporting assembly (3) and a front supporting assembly (4). The front supporting assembly (4) is used for bearing a front supporting point of the aircraft; the rear supporting assembly (3) is used for bearing a rear fulcrum of the aircraft and limiting the rear fulcrum; the front supporting assembly (4) is hinged to the launching platform (31). A spring assembly (5) is arranged between the launching platform (31) and the front supporting assembly (4), and when the front supporting assembly (4) is in the vertical state, the spring assembly (5) provides acting force enabling the front supporting assembly (4) to rotate in the launching direction of the aircraft in the free state. When the unmanned aerial vehicle is separated from the launching rack, the front supporting assembly (4) is rapidly pulled to the horizontal state and locked through the spring assembly (5) arranged between the launching platform (31) and the front supporting assembly (4), and interference and collision between the unmanned aerial vehicle and the front supporting assembly are effectively avoided.

The invention belongs to the technical field of coal mine underground roadway rapid tunneling, and particularly relates to an anchor drill stabilizing system of a tunneling and anchoring all-in-one machine. Comprising a temporary supporting vibration reduction assembly and a drilling rig anchor drill vibration reduction assembly which are arranged on a machine body, the temporary supporting vibration reduction assembly comprises a supporting body, a lifting assembly and a driving source, the lifting assembly comprises a rod sleeve and a screw, the top end of the rod sleeve is connected with the supporting body through a pin shaft and a knuckle bearing, and the bottom end of the screw is connected with the output end of the driving source; the rod sleeve is in threaded connection with the screw rod, and the rod sleeve and threads of the screw rod form a wedge-shaped inclined plane for self-locking; the drilling rig anchor drill damping assembly comprises a drilling rig, a drilling rig support and a hydro-pneumatic suspension device, the drilling rig is installed on the drilling rig support, and the hydro-pneumatic suspension device is additionally installed between the drilling rig and the drilling rig support. The driving source rotates forwards to drive the rod sleeve to reduce the height of the supporting main body, and rotates backwards to lift, so that the supporting main body is always in contact with the top plate without damaging the top plate, and the vibration of the machine body of the digging and anchoring integrated machine in the digging and anchoring process is reduced.

The utility model belongs to the technical field of chip mounter customization equipment, and particularly relates to a rapid chip mounting device for integrated circuit board processing, which comprises a working table, side plates are symmetrically arranged on two sides of the upper surface of the working table, conveying belts are mounted on the sides, close to each other, of the two side plates, and mounting plates are fixedly arranged on the upper surfaces of the two conveying belts. A sliding groove is transversely formed in the surface of the mounting plate, double screws are transversely mounted in the sliding groove through bearings, moving blocks are symmetrically screwed to the surfaces of the double screws, the two moving blocks penetrate through the upper surface of the mounting plate, storage grooves are formed in the upper surfaces of the moving blocks, and the mounting plate is fixed to the conveying belts on the two sides. And then the mounting plate can be driven to move longitudinally through movement of the conveying belt, the mounting plate is matched with a threaded rod above to drive the telescopic chip mounting mechanism to move transversely, rapid positioning is achieved, and the distance between the two transverse strips can be controlled through cooperation of a worm gear and a worm in the mounting plate so as to adapt to fixing work of circuit boards of different sizes.

The utility model relates to the technical field of foundation pit supporting, and discloses a pile foundation guiding and positioning device used for foundation pit supporting construction, which comprises a bottom plate and a supporting frame, four corners of the top end of the bottom plate are respectively welded with four corners of the bottom end of the supporting frame through angle iron, one side of the angle iron is provided with an adjusting assembly, and the adjusting assembly is connected with the bottom end of the supporting frame. A pile groove and a channel are formed in the surface of the bottom plate and the surface of the supporting frame correspondingly, positioning blocks are slidably connected to the two sides of the supporting frame correspondingly, and a V-shaped groove is formed in one side of each positioning block; the device has the advantages that the supporting frame can be conveniently arranged on the surface of the pile in a sleeving mode through the channel, the pile can be located in the pile groove, the pile does not need to be controlled to be arranged between the two positioning blocks from top to bottom, the supporting frame can be conveniently placed, and the driving assembly drives the double-thread screw and the threaded sleeve to drive the two positioning blocks to move oppositely. And the two positioning blocks can centrally support piles with different diameters through the V-shaped grooves.

The utility model relates to the technical field of furniture, in particular to a horizontal front-back push-pull structure of a sofa and a manual sofa backrest, and the horizontal front-back push-pull structure of the manual sofa backrest comprises a sliding rod, a plurality of tooth grooves are formed in the sliding rod at intervals in the axis direction, and at least one of the tooth grooves located in the middle is a long-strip-shaped groove extending in the axis direction of the sliding rod; the sliding block is slidably arranged on the sliding rod in the axis direction of the sliding rod; the crawling gear is rotationally installed on the sliding block and meshed with the tooth groove, and the one-way moving assembly is movably installed on the sliding block; the switching assembly is movably installed on the sliding block, the control assembly is connected with the sliding block, and the control assembly is used for limiting the crawling gear to move forwards farthest to the end, close to the terminal of the sliding rod, of the long-strip-shaped groove; and the control assembly relieves the rotation limitation on the crawling gear. In the sliding process of the backrest, a user can clearly know that the backrest slides to the end point, and the situation that the user is injured due to the fact that the user does not know that the backrest is unlocked is reduced.

The invention discloses a graphite sealing material frictional wear screening test device and method. The device comprises a rotary motion system, a vertical load applying system, a horizontal load applying system, a heating and control system and a frictional wear parameter measuring system which are connected to a test device body, the vertical load applying system enables the test graphite sample to abut against the runway, and provides a radial load for the test graphite sample; the horizontal load applying system is used for abutting a test graphite sample on the sealing seat and providing an axial load for the test graphite sample; the rotary motion system provides power for the rotary motion of the runway; the heating and control system is arranged around the contact part of the test graphite sample and the runway and is used for providing a test environment temperature for the friction-wear test; the frictional wear parameter measuring system is used for acquiring frictional wear parameters in the test; according to the invention, a bidirectional loading mode under the coupling influence of the radial and axial bidirectional loading of the graphite sample is satisfied, the radial jerk values of different runways can be steplessly adjusted, and the dynamic balance precision of a rotary motion system is ensured.

The invention discloses a rotary seat locking mechanism which comprises a fixed disc and a movable disc rotationally matched with the fixed disc, a gear ring is fixedly installed on the fixed disc, and the gear ring is provided with an annular tooth part; a locking block and a transmission assembly controlling the locking block to slide are installed on the movable disc in a sliding mode, and locking teeth matched with the annular tooth part are arranged on the side portion of the locking block. The transmission assembly controls the locking block to slide, and the locking teeth can be switched between meshing and separation of the locking teeth and the annular tooth part. The stepless locking device has the beneficial effects that stepless locking is achieved, noise or shaking is avoided, the locking effect is good, and use is flexible.

The present invention provides a temperature control device for a temperature and humidity calibration box and a temperature control method thereof. The device includes a cold source system and a circulation system respectively connected to the primary side and the secondary side of the evaporator. The cold source system includes a compressor, an oil separator, a condenser, a liquid storage, a filter, a heat regenerator and a first flow regulating valve connected in sequence through pipelines; the circulation system includes a buffer tank, a surface cooler, a circulation pump, a first non-return valve and a pipeline heater connected in sequence through pipelines. The device and method have a wide temperature control range and a fast temperature control speed. The opening of the flow regulating valve can be adjusted according to the current working conditions to optimize the system performance; the temperature control accuracy is high. Due to the secondary heat exchange between the heat transfer medium and the air in the box, the influence of the temperature fluctuation of the heat transfer medium on the temperature in the box is reduced, so the temperature fluctuation degree in the box is ≤±0.01℃; the heat generated by the compressor itself is used as a heat source, the energy efficiency ratio is high, the power consumption is small, and the maximum power consumption can be saved by 50%.

This utility model discloses a folding stool, including a seat frame, a backrest, and legs. The backrest is rotatably mounted to the seat frame via a first pivot, and the legs are hinged to the seat frame via a first adjustment assembly. The first adjustment assembly has a limit hole, and the seat frame has a positioning hole corresponding to the limit hole. A rotating pin is inserted into the limit hole and the positioning hole. A second adjustment assembly is provided between the backrest and the seat frame. By providing a second adjustment assembly consisting of a pull plate, a toothed plate, a gear, and a spring, the user can easily adjust the backrest angle by holding the pull plate with one hand to separate the toothed plate from the gear. After releasing the pull plate, the spring automatically resets, causing the toothed plate to re-engage with the gear for quick locking. This structure is not only easy to operate but also achieves stepless adjustment, meeting the user's personalized comfort needs and overcoming the shortcomings of traditional pin-type adjustment which has a fixed angle, is laborious to operate, and is prone to wear.

The utility model discloses a heat guarantee device, electric energy equipment and a vehicle, and relates to the technical field of rail transit air conditioners, a liquid cooling branch of the heat guarantee device comprises a water return sub-branch, a water outlet sub-branch, a second heating branch and one or more first heating branches, and the second heating branch and the one or more first heating branches are arranged in parallel; each first heating branch is provided with a first heater; the second heating branch is provided with a second heater and a flow adjusting part; wherein the heating power of the first heater is Q1, and Q1 is a non-negative number; the heating power of the second heater is Q2, and Q2 is a non-negative number; the number of the first heating branches is N, and N is a natural number greater than 0; the heating power of the heat guarantee device can be adjusted in a stepless mode in the range of {kQ2 + NQ1k belongs to [0, 1]}, and k is the adjusting range of the flow adjusting piece. According to the heat guarantee device, stepless adjustment of the heating power is achieved, the problem that in the prior art, the temperature of cooling liquid is difficult to flexibly adjust through a single high-power electric heater is effectively solved, and therefore the stability and adaptability of temperature control are improved.

The present invention relates to the technical field of seats, and discloses a stepless armrest assembly, comprising a base plate, a shell installed on the base plate, and a central axis. A one-way assembly, a paddle, and a swivel are sequentially installed in the shell. The one-way assembly comprises a one-way swivel block, at least two convex parts are fixed to the side wall of the one-way swivel block, an elastic member and a friction column are installed between two adjacent convex parts, the paddle is provided with a notch, and a stopper is fixed to the swivel and inserted between two adjacent convex parts after passing through the notch. The present invention has the following advantages and effects: the one-way assembly is provided with a one-way swivel block, a friction column, an elastic member, and a stopper, and when the friction column is abutted against the inner wall of the shell by adjusting the position of the stopper, the one-way assembly and the central axis can rotate forwardly at this time, and when there is a tendency to rotate in the reverse direction, the guiding inclined surface guides the friction column to continuously approach the inner wall of the shell, limiting the flipping of the one-way assembly and the central axis, and can realize stepless adjustment of the position of the armrest connected to the central axis, and the adjustment noise is small.

The air conditioner indoor unit comprises a machine shell, the machine shell is provided with a heat exchange air duct, and the machine shell is further provided with an air inlet and an air outlet which communicate with the heat exchange air duct; the air guide piece is movably arranged on the machine shell and located at the air outlet; and the driving device is connected with the air guide piece to drive the air guide piece to rotate around the first axis and to revolve around the second axis so as to change the air guide direction and the air guide position of the air guide piece. According to the air conditioner indoor unit, the air guide direction and the air guide position of the air guide piece can be changed, the variability of the air conditioner air outlet mode is improved, and stepless adjustment of the air conditioner air outlet direction at the air outlet can be achieved.

The utility model relates to filling device technical field discloses a kind of liquid dripping device capable of adjusting filling nozzle, including rack, the bottom of the rack is fixedly connected with base, the top of the rack is provided with adjusting mechanism, the adjusting mechanism is used to adjust the caliber of canning nozzle to optimize drop, the top left side of the base is provided with blowing mechanism, the blowing mechanism is used to airflow auxiliary liquid, the top rear side of the base is provided with cleaning mechanism, the left side of the adjusting mechanism is provided with infusion mechanism, the adjusting mechanism includes sealing ring, the outer wall of the sealing ring is fixedly connected in the top inside of base, the inner wall of the sealing ring is slidably connected with valve core. In the utility model, when the size of liquid outlet needs to be adjusted, it is not necessary to stop machine and replace spare parts, the valve core changes the filling port inner diameter of valve seat by moving, adjusts liquid flow rate to meet the delivery demand, effectively realizes stepless regulation.

This utility model relates to the field of livestock breeding technology, specifically a precise quantitative feeding pig feed dispenser. It includes a base, a hopper and a guide frame seat on the base, and a quantitative feeding mechanism on the guide frame seat. The quantitative feeding mechanism includes a base plate, a top plate, and a material hopper with adjustable volume. This precise quantitative feeding pig feed dispenser, through its quantitative feeding mechanism, adjusts the amount of feed dispensed by controlling the volume of the material hopper. It can precisely and flexibly dispense feed from the hopper for pigs at different growth stages and with different breeding scales.

The utility model discloses an automatic waist support adjusting assembly which comprises a mounting seat, and a mounting cavity is formed in the mounting seat. The pushing mechanism comprises a pushing rod and a pushing seat, the pushing seat is mounted in the mounting cavity, a guide cavity is formed in the pushing seat, the pushing rod is slidably mounted in the guide cavity, and the guide cavity is used for guiding the pushing rod to slide in the front-back direction; and the driving mechanism is mounted in the mounting cavity and used for driving the pushing rod to slide in the front-back direction. The utility model further discloses a seat, the seat comprises the automatic waist support adjusting assembly, and the mounting seat is connected to a seat back of the seat; and the push rod is connected with the waist support. According to the automatic waist support adjusting assembly and the seat, the driving mechanism can drive the pushing rod to slide back and forth relative to the guiding cavity of the pushing seat and drive the waist support connected with the pushing rod to move back and forth, automatic adjustment of the position of the waist support is achieved, manual adjustment is not needed, and adjustment is accurate and flexible.

This utility model discloses a maintenance-free LED explosion-proof lamp, relating to the field of LED explosion-proof lamp technology. The utility model includes: a lamp body and a mounting plate disposed on the upper end of the lamp body; two fixed frames, symmetrically distributed and fixedly installed on the bottom of the mounting plate, with lifting plates slidably inserted into each of the two fixed frames, and a rotating plate rotatably installed between the two lifting plates. This utility model uses an electric lifting assembly to drive the two lifting plates to rise or fall synchronously within the vertical sliding grooves of the fixed frames, achieving stepless adjustment of the lamp body height. When it is necessary to change the illumination direction, the drive motor drives the rotating shaft to rotate, and the rotating plate rotates accordingly, thereby causing the lamp body at its bottom to rotate at an angle. The entire lifting process does not require manual climbing; it only requires ground remote control or on-site button operation. Simultaneously, after rotating to the specified angle, the positioning assembly locks the lamp body's angle, eliminating the loosening hazards caused by traditional manual angle rotation and bolt tightening.

The utility model relates to an intelligent control system of a hydraulic crawler chassis, which comprises a control module and an adjusting module, the control module comprises a manual control unit, a control panel, a remote controller and a PLC (Programmable Logic Controller), the manual control unit comprises a Hall control lever and a manual control button; the manual operation unit, the operation panel and the remote controller are electrically connected with the PLC; the adjusting module comprises a hydraulic oil tank and a duplex hydraulic pump, the oil inlet end of the duplex hydraulic pump is communicated with the hydraulic oil tank, the duplex hydraulic pump comprises a large-flow pump and a small-flow pump, oil outlets of the large-flow pump and the small-flow pump are connected with hydraulic electromagnetic directional valves, and the hydraulic electromagnetic directional valves are electrically connected with the PLC. The utility model relates to the technical field of crawler chassis control. According to the utility model, a driver can quickly realize normal driving operation of the crawler chassis with less operation and more choices, so that the burden of the driver is reduced, and the safety of personnel and equipment under emergency conditions is guaranteed.

The utility model discloses an adjustable permanent magnet damper, and belongs to the technical field of permanent magnet brakes, and the permanent magnet damper comprises a housing, main shafts which are respectively fixed at two ends of the housing, and main shafts which are rotatably connected in the housing and on two end covers and penetrate through the two end covers; the magnetic piece is arranged in the shell, corresponds to the outer side of the main shaft and is used for generating a magnetic field; the sliding sleeve axially moves in the shell; the magnetic sleeve is fixedly arranged on the inner side of the sliding sleeve and located on one side of the outer portions of the multiple magnetic parts, and the adjusting assembly is arranged on the shell and the end cover, connected with the sliding sleeve and used for driving the sliding sleeve to move and adjusting the length of the magnetic sleeve covering the outer sides of the magnetic parts. According to the adjustable permanent magnet damper, the position of the sliding sleeve is changed through the adjusting assembly, and then the length of the part, covering the outer side of the magnetic piece, of the magnetic sleeve is adjusted, so that stepless adjustment from the minimum damping torque to the maximum damping torque can be achieved, and various requirements for torque under different working conditions are met.

The utility model provides a stepless adjustable support hanger structure which comprises stand columns, a cross beam and connecting fasteners, mounting holes are sequentially and transversely arranged on the surfaces of two sides of the cross beam, the stand columns are arranged at two ends of the cross beam, adjusting holes are symmetrically arranged on the surfaces of two sides of the stand columns, and the adjusting holes are composed of a plurality of rhombic holes which are sequentially and longitudinally arranged and communicated. Limiting parts are formed on the two sides of the adjusting hole. The connecting fastener comprises a square-neck bolt, a nut and a locking piece, one end of the square-neck bolt is matched with the mounting hole and the limiting part in the adjusting groove through the square-neck part of the square-neck bolt to achieve rotary limiting, the other end of the square-neck bolt penetrates through the locking piece and is fixed through the nut, and limiting blocks are arranged at the upper end and the lower end of one side of the locking piece; the limiting blocks are embedded into the adjusting holes and the mounting holes to achieve limiting and fixing, the cross beams and the stand columns are fixedly connected through the connecting and fixing pieces, the bearing capacity of the support and hanger mainly depends on shearing force of the adjusting holes and the mounting holes, and therefore the bearing capacity of the support and hanger is mainly concentrated on the stand columns, and the stability of the support and hanger is guaranteed.

The invention discloses an assembly type laminated slab cast-in-place slab strip reinforcing part, and belongs to the technical field of independent supporting formworks. The assembly type laminated slab cast-in-place slab strip reinforcing part comprises a supporting base, and a supporting sleeve is fixed to the top end of the supporting base; a mounting clamping ring is fixed outside the supporting sleeve, a supporting mechanism capable of being flexibly folded and unfolded is arranged outside the mounting clamping ring, and a connecting mechanism capable of rapidly disassembling and assembling the supporting mechanism is arranged outside the supporting mechanism; by arranging the supporting mechanisms and the connecting mechanisms, the mode of combining sliding folding and lock catch connection is adopted, so that the supporting rods can be flexibly folded and unfolded, when transportation is needed, the triangular stabilizing frame can be folded along the connecting mechanisms, the size of the triangular stabilizing frame is greatly reduced, transportation is facilitated, and meanwhile the triangular stabilizing frame is convenient to use. When the connecting mechanism is connected with the supporting sleeve, the connecting mechanism can be tightly matched with the supporting sleeve, firm connection is ensured, and therefore the stability of the supporting sleeve is effectively improved.

The utility model discloses a glass product impact testing device belongs to experimental equipment technical field. Aiming at the single problem of test data caused by the fixed falling height of the steel ball of the existing device, an innovative solution is provided. The utility model discloses at least three non - coplanar support rods through the first support plate setting, one of the support rod sets up the liftable lifting cylinder, and the lifting cylinder is connected with the adjusting frame and installs the electromagnetic chuck, and the electromagnetic chuck is connected with the power supply through the electric connection line that is equipped with on - off switch, realizes the adsorption and release to the steel ball, and the top second support plate sets up first deflection pulley and second deflection pulley, and is linked with the lifting cylinder and the lifting block through the lifting connection line linkage, realizes the height continuous regulation of electromagnetic chuck. The utility model discloses through the height -adjustable electromagnetic chuck and the pulley set transmission structure, can change the falling height of ball flexibly, realizes different impact force test, and the diversity and application scope of glass product impact resistance performance test have been improved significantly.

The application discloses a pre-buried adjustable expansion depth expansion bolt assembly and belongs to the technical field of expansion bolts, which comprises a spring pad, a flat pad, a pre-buried sleeve, a hexagonal nut, an expansion sleeve, an expansion cone, an adjusting screw rod and a sealing end cover. In order to overcome the defects of the prior art, such as the damage to the concrete structure and the internal steel bars caused by the post-construction of the expansion bolt, the fixed and unadjustable expansion depth of the pre-buried anchor bolt, the jamming of the adjusting mechanism caused by the cement seepage due to the unreliable sealing of the plastic film during the pouring process, and the loosening of the anchoring force under long-term vibration, the application provides the pre-buried adjustable expansion depth expansion bolt assembly, so that the expansion depth of the expansion bolt on the market can be flexibly adjusted according to the actual wall thickness or the size of the decorative layer under the premise of pre-buried installation, the problems of the poor stability of the sealing end cover during the pouring process, the cement leakage caused by the poor stability of the sealing end cover, the single anchoring force between the expansion sleeve and the concrete and the insufficient long-term reliability of the expansion sleeve and the concrete are solved.

The toggle rod driving mechanism is characterized in that the toggle rod driving mechanism comprises a machine body, a toggle rod mechanism, a transmission gear and a rack, the toggle rod mechanism drives a sliding block to move up and down through a guide column, a servo motor is fixedly arranged on the machine body, a speed reduction assembly is connected to the servo motor, and the transmission gear and an output shaft of the speed reduction assembly are coaxially fixed. A guide seat is fixedly arranged on the machine body, the rack is in horizontal sliding fit with the guide seat, the transmission gear is meshed with the rack, one end of the rack is hinged to the toggle rod mechanism, and when the transmission gear and the rack complete a one-way movement stroke, the toggle rod mechanism drives the sliding block to complete one-time up-down back-and-forth movement; the utility model has the advantages that no gap exists when the transmission gear and the rack move unidirectionally, so that no impact exists in the driving mechanism of the slide block during processing, the high precision and stability of the bottom dead center of the slide block are ensured, the processing quality of products is improved, and meanwhile, the production efficiency is also improved.