7682 results about "Friction force" patented technology

The invention provides a mechanical arm control system and control method of a photovoltaic panel intelligent installation robot, and relates to the technical field of photovoltaic equipment installation. According to the method, a three-dimensional point cloud map is constructed, the curvature characteristics of the surface of an obstacle are recognized, meanwhile, a joint angle is fed back through a magnetic encoder, and normal pressure and tangential friction force are monitored through a sensor; when the normal pressure exceeds a threshold value, a reverse displacement compensation amount is calculated based on reverse dynamics, a compensation instruction is generated, and a safe approaching direction is determined in combination with curvature characteristics; and the joint angular velocity and the torque threshold are adjusted in real time through a nonlinear sliding mode control algorithm, a smooth joint target torque curve is generated, and it is ensured that the mechanical arm stably tracks the path and the tail end friction force is controlled. And in an abnormal condition, the system triggers an alarm and freezes the mechanical arm until the operator confirms the compensation strategy. The control precision and adaptability of the mechanical arm are improved, the photovoltaic panel is effectively prevented from being damaged, and the installation efficiency and reliability are improved.

An open and short circuit testing device and method. The device comprises a base (1), a support frame (2), a test board (5) and a placement frame (4). The test board (5) is slidably connected to the side opposite to the support frame (2), and the test board (5) moves downwards to drive a gear (14) to rotate; a limiting plate (17) is used for limiting reverse rotation of the gear (14); and a probe (26) is used for connecting to a circuit board to achieve testing. Under normal conditions, the friction force when the probe (26) is inserted into a wiring terminal (29) is less than the minimum elastic force of a second spring (25), when the probe (26) fails to be normally connected to the wiring terminal (29), the probe (26) is pressed downwards when a movable plate (23) moves downwards, the probe (26) is adjusted by means of the second spring (25) at the top of the probe (26), so that the probe (26) returns to normal, the pressure sensor (31) detects whether there is an abnormality, and when the second spring (25) at the top of the probe (26) is compressed, the pressure sensor (31) at the top of the second spring (25) measures an excessively large pressure value, i.e., indicating that a device abnormality occurs during the testing process rather than representing that there is necessarily a problem with the circuit board to be tested itself, thereby improving the accuracy of the testing result.

Disclosed is a low-precision incremental encoder-based method for ultra-low speed control of a servo system. According to the present invention, a fast speed observer in an ultra-low-speed working state is achieved, only a sampling speed and load torque in an M / T method need to be observed, and position information of an electric motor does not need to be observed, such that the structure of the observer is simplified, and calculation is simple and fast; moreover, the influence of a friction force and cogging torque on a speed change is considered, such that the speed observation precision is further improved. The fast speed observer can reduce hysteresis and measurement dead zones, such that the speed response and the speed control precision in a low-speed working state are greatly improved, the problem in a traditional observer of a large position deviation caused by nonlinear factors such as an external load is avoided, improving the stability and robustness of the system. According to the present invention, the processing of sampling measurement time at a medium-high speed and the processing of switching the observer at a low speed in the M / T method can optimize the speed measurement precision at both the medium-high speed and the ultra-low speed, and can better satisfy the requirements of apparatuses such as a radar on rotating speed control.

The invention relates to a multi-process forming judgment method based on two-way tensile limit strain, which comprises the following steps: on the basis of a deformation mechanism experienced during material forming, associating complex loading characteristics of a two-way tensile test with a complex deformation process of a part, and analyzing the loading history of a plate by utilizing a method of combining the test and simulation; the limit strain of the material in different deformation directions at different stages is ingeniously obtained, so that the forming result of the material is accurately judged; the method can ensure that the limit strain of the sheet cannot be influenced by bending stress and friction force, overcomes the technical problem that the existing method cannot meet the multi-process forming judgment of parts, greatly improves the accuracy and effectiveness of forming simulation analysis, is particularly suitable for occasions of multi-process forming analysis of metal sheet materials, and has wide application prospects. And the application requirements of engineering practice and scientific research work are widely met.

The invention provides a finite element-based method for estimating pulling-out ultimate bearing capacity of a grouting screw anchor in gravelly soil, and relates to the technical field of civil structure engineering.A three-dimensional finite element model containing the grouting screw anchor and surrounding gravelly soil is established, model parameters cover the structure and material characteristics of the grouting screw anchor, and the grouting screw anchor and the surrounding gravelly soil are subjected to finite element modeling; a coordinate axis is established with the center of the anchor bottom as an original point for grid division, a stress concentration area is analyzed, principal stress is calculated to serve as critical bearing stress, vertical pull-out loads are applied step by step through a grouting pull-out test, a pull-out stress influence area is determined, soil stress of the area is analyzed, and soil binding power and friction force are calculated. And a grouting coefficient and a rock crack coefficient are generated, soil parameters are corrected, and the ultimate pulling bearing capacity of the grouting screw anchor is comprehensively obtained. According to the method, the pulling ultimate bearing capacity of the grouting screw anchor is accurately evaluated by establishing the three-dimensional finite element model and the graded loading experiment.

The utility model discloses a follow-up lead screw auxiliary supporting structure which comprises a guide rail matched with the guide rail and a supporting assembly capable of moving on the guide rail, the supporting assembly comprises a supporting block used for supporting a lead screw and a sliding block used for being connected to the guide rail in a sliding mode, the supporting block and the sliding block are arranged in a synchronous movement mode, and an elastic piece is arranged between the supporting block and the sliding block. The supporting surface of the supporting block elastically abuts against the peripheral surface of the lead screw and is in sliding connection with the peripheral surface of the lead screw, so that self-adaptive auxiliary supporting arrangement is formed for the lead screw, abnormal abrasion caused by too large friction force between the supporting block and the lead screw can be avoided, meanwhile, self-adaptive auxiliary supporting for the lead screw is achieved, and then the machining precision of a machine tool is guaranteed.

The invention discloses a dynamic tension control method for a dry-method winding and unwinding system, solves the problems of high overshoot, long coil diameter sudden change adjustment time and large steady-state fluctuation in low-speed operation of the dry-method winding and unwinding system under a high-speed reversing working condition, and belongs to the technical field of composite material equipment development. The method comprises the steps of collecting data of a winding and unwinding system, identifying total rotational inertia and friction torque on line according to the data, obtaining a friction compensation item according to the friction torque, and obtaining a rotational inertia feed-forward item according to the total rotational inertia; the method comprises the following steps of S1, inputting the tension error and the tension error change rate of the winding and unwinding system into a fuzzy PID controller to obtain a PID parameter real-time adjustment amount, updating a PID parameter, and then obtaining a PID feedback control amount at the current moment k by using the PID controller and the tension error, and S3, synthesizing a friction force compensation item, a rotational inertia feed-forward item and the PID feedback control amount into a final control amount of the winding and unwinding system.

The invention relates to the technical field of damping and shock absorption, in particular to a damping-adjustable composite shock absorption system for textile printing and dyeing equipment, which comprises a bottom plate and a top plate, a first shock absorption unit and a movable plate are mounted between the bottom plate and the top plate, and a first buffer spring is fixedly connected between the top plate and the movable plate; a second damping unit is installed between the movable plate and the bottom plate. During damping, vibration is buffered through telescopic deformation of a first buffer spring and a second buffer spring, oil liquid is pushed to flow in backflow oil pipes through vertical movement of a first piston rod, vibration energy is consumed through friction force between the oil liquid and the backflow oil pipes, and vibration of a machine body is restrained; the different backflow oil pipes are switched to be communicated with the oil storage cavity through the switching mechanism, the longer the backflow oil pipes are, the larger the on-way resistance when oil passes through the backflow oil pipes is, the higher the damping force is, and the damping device can be conveniently installed on textile printing and dyeing equipment with different vibration intensities for damping.

The invention relates to the field of transmission towers, and discloses a tension type transmission tower buffer connecting device which comprises a supporting frame, a plurality of isolation assemblies are symmetrically arranged on the upper surface of the supporting frame, sliding seats are slidably connected into the isolation assemblies, and connecting rods are fixedly connected to the outer surfaces of the sliding seats. A belleville spring set is arranged between the outer surface of the sliding base and the inner wall of the isolation assembly, the belleville spring set is arranged on the outer surface of the connecting rod in a sleeving mode, and a telescopic rod and a first spring are fixedly connected between the outer surface of the sliding base and the inner wall of the isolation assembly. A primary buffer layer is formed by the belleville spring set and the first spring, axial impact force can be absorbed without sliding of the sliding seat during daily wind vibration and wire slight galloping, meanwhile, vibration can be restrained through the huge static friction torque of the fan-shaped friction face and the friction ball in the omnidirectional damping assembly, the circuit is kept stable, and slight load impact is effectively dealt with.

The invention discloses a winding device and method for alloy steel wire machining, and relates to the technical field of alloy steel wire production, the winding device comprises a first frame body, a second frame body and a winding disc for winding a steel wire and further comprises a winding part, the winding part is installed on the first frame body and used for winding the steel wire, and the winding part comprises a positioning assembly and a winding assembly; the positioning assembly is used for positioning the winding discs of different sizes, and the winding assembly is used for driving the winding discs to rotate so as to wind the steel wires. The device has the advantages that friction force generated between the device and a rubber wheel in the guiding and winding process can be reduced to zero, so that the tension control precision is improved, meanwhile, the wire feeding and discharging angle between a steel wire and the rubber wheel is controlled in the guiding process, it is guaranteed that the steel wire is fed and discharged smoothly, the tension control stability is kept, and the production efficiency is improved. And the tension control is more accurate and stable.

The invention discloses intelligent bent pipe punch forming equipment and method, and relates to the technical field of pipe fitting punch forming, the intelligent bent pipe punch forming equipment comprises a machine body and a pipe blank, the machine body is provided with a die mechanism, a pushing mechanism and an elbow core rod provided with a first quick release assembly, and the die mechanism comprises an upper die and a lower die which are fixed to the machine body; the upper die and the lower die are respectively provided with forming runners which are matched with each other, and the tube blank is placed in the forming runner of the lower die. By arranging the pressure feedback mechanism and the lubricating oil spraying mechanism, the friction force between the pipe blank and the elbow core rod is converted into the pressure value change in the pressure detection cavity and transmitted to the piezoelectric sensor, the piezoelectric sensor feeds back the pressure value to the control unit, and the control unit can control the rotating speed of the oil pump according to the pressure value. The larger the friction force between the pipe blank and the elbow core rod is, the higher the rotating speed of the oil pump is, the more lubricating oil is sprayed out of the oil spraying holes, the intelligent degree of lubrication is improved, and the stamping effect is guaranteed.

The invention provides a shoe sole wear resistance detection device, and belongs to the technical field of wear resistance detection, the shoe sole wear resistance detection device comprises an instrument body and a shoe sole sample formed by punching a shoe sole, and further comprises a simulation detection assembly and a dust removal cleaning assembly; under the guidance of the guide ring, the first support arm can periodically move up and down, the process simulates the dynamic change of the pressure borne by the sole in different gait stages when a person walks, and in combination with the rotation of the sole sample, not only is the vertical pressure change simulated, but also the friction force in different directions can be simulated through relative sliding. The stress state of the shoe sole in the walking process is restored, so that the detection is closer to the actual use scene; the dust removal system is driven by the power of the detection device to operate, so that all-directional coverage of the whole abrasion area is realized, the retention time of dust in the detection area is reduced, dust interference can be avoided, the state of a sole sample before and after detection is only influenced by abrasion of a grinding wheel, and the detection result more truly reflects the abrasion resistance of the sole.

The invention discloses a high-precision flying shear, which belongs to the field of metal cutting, and comprises a portal frame, and a pinch roll is rotatably arranged on the portal frame; a first rotating roller and a second rotating roller are rotationally mounted on the portal frame, and cutters are mounted on the outer walls of the first rotating roller and the second rotating roller; a driving mechanism for driving the first rotating roller and the second rotating roller to rotate is arranged on the portal frame; two mounting frames are symmetrically arranged on the inner side wall of the portal frame; in the process that the pinch roll drives the plate to move, under the action of friction force, the heat dissipation plate moves along with the to-be-sheared plate, in the process that the heat dissipation plate moves along with the plate, the turbulent flow mechanism drives air around the heat dissipation holes to flow, the flow speed of the air around the heat dissipation holes is increased, and therefore the to-be-sheared part can be cooled; the temperature difference between the to-be-sheared part and the cutter is reduced, the thermal-mechanical coupling effect is relieved, the probability of uneven deformation in the shearing process is reduced, the probability of generation of wave-shaped edge defects is obviously reduced, and therefore the shearing quality is improved.

The invention belongs to the field of rock-soil drilling equipment, and discloses a highway construction rock drilling sampling device which comprises a rack, a sampling device and a sampling device, the drill rod assembly is arranged on the rack and comprises an inner shaft rod and an outer sleeve rod, and the inner shaft rod is rotationally sleeved with the outer sleeve rod; the first driving mechanism at least drives the outer sleeve rod to rotate; and the drill bit assembly is connected with the drill rod assembly. Through the drill rod assembly and the drill bit assembly, a sampling component and a drilling component of the drill bit assembly are matched with a limiting tooth part through a movable ratchet assembly, state switching of the sampling component and the drilling component can be achieved, and when the drilling component is reversely screwed out after drilling, a movable tightening piece can be driven to move by rotating relative to the sampling component; and the movable tightening part of the sampling component can tighten and clamp the sample, so that the friction force in the sampling process can be increased, the sample is not easy to fall off, the structure is simpler, and the operation is easy.

A testing device for a current-carrying friction and wear performance of a flexible rolling friction pair, including a base plate, supporting profiles, and guiding rail sliders, and a screw assembly, and a movable supporting plate, and a fixed supporting plate, and first bearing supports, and a slider supporting plate, during the testing process, friction moment and friction force of the flexible rolling electrical contact component can be obtained by monitoring dynamic torque of rotating wheel, which is wide applicability, which allows simultaneous online monitoring of multiple experimental variables such as friction performance, current-carrying capacity, preload, friction force, and temperature; and at the same time, there is no need to adjust, assemble, or test multiple objects for the rolling ring structure; the testing process can be completed by only adjusting and testing the key electrical contact test piece, significantly simplifying the testing structure and method while reducing testing costs.

The invention discloses a device and a method for testing wear resistance of a coating material in a high-temperature environment, and relates to the technical field of coating material testing, and the device comprises a workbench, a friction force loading mechanism, a test force loading mechanism, a high-temperature heating system, a force detection unit and a computer. The friction force loading mechanism provides stable friction force, the test force loading mechanism accurately applies test force, the high-temperature heating system creates a high-temperature environment, and the force detection unit detects force data in real time and transmits the force data to the computer for processing and analysis. The second driving mechanism is unique in structure and can accurately control test force loading, the circulating cooling unit is further arranged to protect the transmission shaft, the high-temperature furnace meets different temperature requirements, inert gas can be introduced to prevent high-temperature oxidation, and compared with a vacuum testing machine, the manufacturing cost can be greatly reduced. The problem that an existing detection device cannot accurately test the wear resistance of the coating material in a high-temperature environment is solved, and powerful support is provided for research, development and application of the coating material in the fields of aerospace and the like.

The invention discloses a combined sealing device frictional wear and external leakage test bed and a test method thereof, and aims to solve the problem that the existing device cannot accurately know the sealing wear. The test bench comprises a rack, a test piece, a stay wire sensor, an oil pipe and a hydraulic system, wherein an oil tank is arranged in the rack. The test piece comprises a test sealing assembly and a plunger, and the stay wire sensor is connected with a sealing combination structure. During testing, the hydraulic system drives the plunger and the sealing assembly to move relatively, the pull wire sensor measures displacement, friction force is calculated by combining pressure data to reflect abrasion, and the oil groove collects leaked oil. According to the invention, comprehensive testing of friction, wear and leakage is realized, sealing performance and wear rules under multiple working conditions can be analyzed, the structure is convenient to observe and operate, and optimization of the sealing structure is facilitated.

The embodiment of the invention relates to the field of motors, and provides a motor, a camera module and electronic equipment. The motor comprises a lens carrier, a frame, a magnetic attraction mechanism and two sliding rail mechanisms, and the two sliding rail mechanisms are diagonally arranged between the frame and the lens carrier on a plane perpendicular to the optical axis direction of the lens and used for providing a sliding supporting face for movement of the lens carrier in the optical axis direction so as to reduce friction force. The magnetic attraction force generated by the magnetic attraction mechanism is used for making the lens carrier abut against the sliding rail mechanism. The two slide rail mechanisms are arranged diagonally and are uniform in structure distribution, so that the stress of the lens carrier is uniform, the stability of the structure is facilitated, the requirement of the motor for magnetic attraction force is reduced, the requirement of automatic focusing for driving force is reduced, the power consumption and the cost are reduced, the miniaturization design of the motor is facilitated, and the service life of the motor is prolonged. And the design difficulty is integrally simplified.

The invention relates to the technical field of information, in particular to a method and system for accurately controlling friction force of a support rotating shaft in the design field of the support rotating shaft, and the method comprises the steps: obtaining the rotating frequency and load size data of the support rotating shaft under different postures as the basis of subsequent analysis; according to the change trend of the wear degree, establishing a mapping relation between the geometrical shape and a friction force value, and fitting a mapping function through geometrical characteristics and friction force experiment data; a multi-objective optimization algorithm is adopted, material performance and a surface treatment process are combined, an optimal parameter combination of the geometrical shape is solved, and an objective function is friction force uniformity and wear rate minimization; generating a rotating shaft geometric structure with uniformly distributed friction force values through the optimal parameter combination, and ensuring that geometric characteristics meet preset friction force and wear requirements; according to the control model and the constraint conditions, the optimal friction value range of the rotating shaft under different working conditions is calculated, and it is ensured that the friction value is within a preset threshold value.

The invention relates to the technical field of tool magazines, and discloses a tool pouch turnover device of a chain belt type tool magazine, which comprises a frame body, a driving chain belt is arranged in the frame body, a plurality of swing plates are equidistantly arranged on the driving chain belt, one end of each swing plate is fixedly connected with a tool pouch, and the other end of each swing plate is provided with a tool reversing wheel. A tool reversing air cylinder is arranged outside the driving chain belt, a tool reversing block is fixedly connected to the telescopic end of the tool reversing air cylinder, a storage box is arranged on one side of the tool reversing air cylinder, lubricating oil is stored in the storage box, an oil squeezing box is arranged between the storage box and the tool reversing air cylinder, and a connecting pipe is communicated between the top end of the oil squeezing box and the bottom end of the storage box. According to the device, lubricating oil can be automatically sprayed to the tool reversing wheel clamped in the tool reversing block, the tool reversing wheel and the inner wall of the tool reversing block are lubricated, the lubricating oil does not need to be manually smeared, the friction force between the tool reversing wheel and the tool reversing block is greatly reduced, and clamping or abnormal sound is avoided.

The invention discloses a gear machining positioning device, and belongs to the technical field of gear machining, the gear machining positioning device comprises a base, a placing table is fixedly mounted on the surface of the base, through grooves are formed in the base and the placing table, and an expanding mechanism is slidably connected in each through groove; a driving mechanism used for driving the opening mechanism to move downwards is fixedly installed in the base, three linkage mechanisms are arranged on the surface of the containing table, three locking mechanisms are slidably connected into the containing table, and the opening mechanism is placed in the middle of a gear. The hinged position of the first support and the second support is attached to the inner wall of the gear to fix the gear for the first time, protruding points are arranged at the ends of the first support and the second support, friction force between the protruding points and the inner wall of the gear is increased, and at the moment, the driving mechanism is started to enable the opening mechanism to move downwards to drive the gear to make contact with the surface of the containing table and apply downward force to the surface of the gear. And the fixing effect of the gear is further improved.

The invention relates to a plate edge sealing treatment device for plane design, which comprises a back plate, a guide assembly, a belt supply assembly and a shearing assembly. The front surface of the back plate is attached to the back surface of a plate, the guide assembly is attached to the front surface of the plate, and an n-shaped lap joint piece is in lap joint with the upper end of the plate; the device is pushed to move from one end of a plate to the other end of the plate, in the moving process, a glue solution stored in a glue solution storage box drips on a glue coating wheel through a glue supply pipe, the glue coating wheel rotates under the action of friction force, the upper end of the plate is evenly coated with the glue solution, the front end of an edge sealing belt is bent backwards under the blocking action of a baffle and the side edge of the plate, and the edge sealing belt is fixed. The edge sealing belt is pressed below the pressing roller, the edge sealing belt is pasted on a plate for edge sealing under the extrusion effect of the pressing roller, after edge sealing is completed, the edge sealing belt is cut off through the shearing assembly, deflection or bubbles cannot occur between the edge sealing belt and the plate, the attractiveness of a finished product is good, and the small-batch edge sealing requirement of a plane designer during home decoration design is met.

The invention discloses a grouting anchoring device and a groutable solid anchor rod composed of the grouting anchoring device. The grouting anchoring device comprises an anchoring anchor rod, a fixing device and the grouting anchoring device. The grouting anchoring device comprises a sleeve assembly and a grouting cup. The sleeve assembly comprises an inner supporting pipe and an outer connecting pipe connected with the inner supporting pipe in a sleeving mode, a plurality of grabbing rods rotationally connected with the inner supporting pipe are arranged at the bottom of the inner supporting pipe, elastic pieces are arranged at the connecting positions of the grabbing rods and the inner supporting pipe, and clamping grooves for limiting rotation of the grabbing rods are formed in the outer connecting pipe. A driving pipe is rotationally connected to the upper end of the outer connecting pipe, the driving pipe is in threaded connection with the inner supporting pipe, and the driving pipe enables the outer connecting pipe to do lifting motion relative to the inner supporting pipe through threaded connection so that the grabbing rod can be disengaged from the clamping groove. The friction force between the anchor rod and the stratum can be improved, the anchoring effect can be enhanced, meanwhile, the anchor rod can well adapt to the hole diameter change, it is ensured that the anchor rod can stably work in drill holes with different hole diameters, and controllability of the grouting process is ensured.

The invention discloses a marine winch brake device, which relates to the technical field of winches, and comprises an outer shell, a movable shell, a brake mechanism, a pinion, a bull gear, a multi-stage buffer mechanism, a locking mechanism, a clamping mechanism and a connecting shaft, the piston is pushed through the oil cylinder, power is transmitted through hydraulic oil, the brake block is driven to brake the brake disc, primary braking of the winch main shaft is achieved, and the braking mode is efficient and reliable; the wear-resistant anti-skid layers are arranged on the opposite faces of the brake blocks, friction force is effectively increased, the braking effect is improved, and the stability of the braking process is guaranteed; the tooth grooves in the outer circle face of the movable shell are matched with the movable clamping teeth, when the braking resistance is increased, the movable clamping teeth and the tooth grooves are indirectly separated for braking, and the braking performance is further optimized; the large gear is used for driving the multi-stage buffering mechanism to work, oil in the oil storage cavity is pumped into the buffering oil cavity through the hydraulic pump for buffering and energy absorption, winch damage caused by braking is avoided, and the service life of the winch is prolonged.

The invention relates to the technical field of shaft part production, and discloses a shaft part full-automatic packaging device which comprises a supporting frame, a driving mechanism is arranged on the supporting frame and comprises a driving assembly, a second driving roller and a first driving roller, and a shaft rod driven by the driving assembly is placed on the first driving roller; a winding mechanism is mounted on the driving mechanism, the winding mechanism comprises a reciprocating assembly and a winding film roll, and the reciprocating assembly controls the winding film roll to wind the shaft rod from different positions in the rotating process of the shaft rod; a pressing and holding mechanism is fixedly mounted on the winding mechanism, a first motor drives a third gear to mesh and drive a first gear and a second gear, so that a first driving roller and a second driving roller synchronously rotate, and a shaft rod is driven to stably rotate by virtue of friction force of a rubber roller surface; and the rotating requirements of shaft rods with different diameters can be met, enough driving torque can be particularly provided for a large shaft rod, the blocking phenomenon caused by high rotational inertia is avoided, and it is guaranteed that a winding film is evenly wound.

A driving mechanism, comprising: a main support body (100); a first transmission member (200), the first transmission member (200) comprising a first end portion and a second end portion, and the second end portion being used for being connected to a cleaning member (500); a second transmission member (300), the first transmission member (200) and the second transmission member (300) being movably connected, the second transmission member (300) being movably connected to the main support body (100), and a first friction force being provided between the second transmission member (300) and the main support body (100); a power assembly (400), the power assembly (400) being transmittingly connected to the first end portion, and the power assembly (400) being used for driving the first transmission member (200) to rotate, such that the first transmission member (200) interacts with the second transmission member (300) so as to drive the first transmission member (200) to drive the cleaning member (500) to ascend or descend.

The utility model relates to the technical field of machining, and discloses an anti-skid clamp for machining, which comprises two supporting legs, the tops of the two supporting legs are fixedly connected with a table top, the top of the table top is fixedly connected with a supporting column, the top of the supporting column is fixedly connected with a first box body, and the first box body is fixedly connected with a second box body. A first motor is fixedly connected to the interior of the first box body, a worm is fixedly connected to the driving end of the first motor, a second transmission shaft is rotationally connected to the interior of the first box body, a worm gear is fixedly connected to the exterior of the second transmission shaft, and a third gear is fixedly connected to the exterior of the second transmission shaft. According to the clamping device, the second motor drives the first gear to rotate so as to drive the second gear to rotate, then the first transmission shaft and the clamping assembly on the right side of the first transmission shaft are driven to rotate, clamped parts can be machined in multiple directions conveniently, the clamping block convenient to disassemble can enable the clamping device to keep good clamping friction force, and the clamping effect is improved.

The invention provides a supporting device for laying a long steel rail large ramp, and belongs to the technical field of steel rail laying. Comprising two bottom shells, the two bottom shells are placed on a base, supporting mechanisms are arranged on the bottom shells, and the side faces of the bottom shells are attached to the vertical face of a concrete sleeper. The supporting mechanism is arranged, the round roller and the limiting block are installed on the supporting mechanism, when the supporting mechanism needs to be taken out, only a pull rope needs to be pulled, the round roller is made to incline downwards through a rotating assembly by pulling of the pull rope, in this way, friction force between the round roller and the long steel rail can be obviously reduced, meanwhile, the limiting block can contract inwards, and therefore the supporting mechanism can be taken out conveniently. The situation that clamping stagnation occurs between the limiting blocks and the long steel rail is effectively avoided, under the dual effects of friction force reduction and clamping stagnation risk elimination, the two adjacent supporting mechanisms can be easily pulled out from the bottom of the long steel rail only by continuously pulling the pull rope, and the whole operation process becomes simpler, more convenient and more efficient.

The utility model provides a compound PVC (polyvinyl chloride) plastic extruding device which comprises a processing material pipe, a discharging circular plate is mounted at the front end of the processing material pipe, an extruding front plate is fixedly connected to one end, far away from the processing material pipe, of the discharging circular plate, and an electric rotating shaft is fixedly connected to the middle of one end, far away from the discharging circular plate, of the extruding front plate. A transverse rotating strip plate is fixedly connected to the output end of the electric rotating shaft, a fixed vertical plate is fixedly connected to the end, away from the discharging circular plate, of the extrusion front plate, a movable vertical plate is fixedly connected to the end, away from the discharging circular plate, of the fixed vertical plate, and grinding knife inner surface layers are fixedly connected to the ends, close to each other, of the movable vertical plate and the fixed vertical plate; according to the scheme, the grinding device matched with the cutting knife face is arranged above the extrusion front plate, the grinding knife inner face layer between the fixed vertical plate and the movable vertical plate can make contact with the cutting knife face, friction force is generated, chippings and blunt objects outside the cutting knife face are evenly ground, and the cutting precision of the cutting knife face is kept; furthermore, the processing effect of an extruded finished product is better.

The invention discloses a biomechanical self-ligating bracket, and belongs to the field of biomechanical self-ligating brackets, the biomechanical self-ligating bracket comprises an arch-shaped base, the upper end of the arch-shaped base is fixedly connected with a base, the upper end of the base is connected with a bracket wing assembly, the upper end of the base is connected with a limiting assembly, and the interior of the bracket wing assembly is connected with an anti-opening assembly. According to the key points of the technical scheme, by arranging a limiting assembly, when the arch wire slides in the designed direction (forward sliding), namely, the arch wire slides from back to front, a sliding block keeps in contact with the lower portion of the arch wire under the elastic force of a spring, the thrust of the arch wire is decomposed into normal force and tangential force, the friction resistance of the arch wire is small, and when the arch wire slides in the reverse direction, the sliding block is dragged by the friction force to slide along a sliding groove; the spring is stretched, the clamping block is finally wedged into the clamping groove, and the friction resistance of the arch wire is increased, so that the sliding block forms a self-locking effect, and the situation that teeth are difficult to move in a preset direction due to reverse sliding of the arch wire is prevented.