142results about How to "Overcoming frictional resistance" patented technology

The invention discloses an energy-saving hydraulic seal experiment table and a method thereof. The experiment table consists of an experimental cylinder, a driving loop of the experimental cylinder and a loading loop, and is characterized in that the experimental cylinder consists of a left cylinder cover, a left guide sleeve, a cylinder barrel, a piston, a piston rod, a right guide sleeve and a right cylinder cover; the driving loop of the experimental cylinder comprises a variable pump, a safety valve, a filter, a solenoid valve, etc; and the loading loop comprises a fixed displacement pump, an overflow valve, a filter, a solenoid valve, an accumulator and a stop valve. The experiment table can conduct experiments on various sealing rings of the piston and the piston rod, carry out online inspection of the sealing performance and the tribological properties of the sealing rings and the manufacturing quality of sealing elements, and perform experiments on a plurality of sealing elements to be detected simultaneously. The experiment table has the advantages of adjustable experiment speed and pressure, and excellent energy-saving effect.

The invention relates to an airfoil flow control device. The airfoil flow control device is arranged on the upper surface of the main airfoil of an airplane near the front edge of the airfoil. The device consists of a fundamental frequency Gershgorim band and a subharmonic frequency Gershgorim band which are arranged in parallel; both the fundamental frequency Gershgorim band and the subharmonic frequency Gershgorim band are in a sawtooth shape; during the taking off stage, a front flap extends the airfoil flow control device, thereby controlling the boundary layer of the airfoil to fast transit and form an onflow boundary layer used for restraining or eliminating the separation of the boundary layers, thereby effectively improving the life force of the airfoil; during cruising flying, the front flap of the airfoil resets to cover the device, thus leading the device to be out of use and leading the boundary layer of the airfoil to maintain a layer flow during the cruising stage, so as to reduce the friction resistance at the airfoil surface and improve the lift-drag ratio. The airfoil flow control device has the advantages of simple structure, light weight and convenient for being maintained, can solve the separation problem of the boundary layers of the airfoil surfaces during the taking off state of the airplane under the situations of not increasing the weight of the airplane and the power; besides, the airfoil flow control device also avoids the increasing problem of the friction resistance brought by the transition of the boundary layers of the airfoil surfaces during the cruising flying stage.

The invention discloses a robot collision processing method, a device and a robot, wherein the method comprises the steps of making the robot move to a rotating position and perform rotation after collision between a robot and an obstacle occurs; in the rotation process, monitoring an obstacle distance change condition which is sensed by a distance sensor that is arranged at a preset position of the robot; determining whether the current orientation is parallel with the obstacle according to the obstacle distance change condition; and if yes, making the robot stop rotation and move along the obstacle. According to the robot collision processing method, the device and the robot, collision processing can be performed after collision between the robot and the obstacle occurs, and the robot can move along the obstacle, thereby finishing a cleaning operation.

The invention discloses a preparation method for decreasing sintered NdFeB declination. The preparation method includes preparing materials, performing smelting, processing powder, performing forming and performing sintering; to be specific, adding addition agent during powder processing to improve powder liquidity; increasing magnetic field intensity H during forming; reducing mold orientation length L; enlarging section area A in the vertical magnetic line direction; feeding mixture powder in a forming mold of a press; adjusting a center, on a coil pole, of the forming mold on a mold frame to allow the presses powder to stay in the center of the coil magnetic field during forming orientation pressing; by adjusting four relative parameters, the declination of the sintered NdFeB is decreased to 3 degrees from 10 degrees, use ratio of material with declination qualified is increased to 60% or above from 35%, production cost is remarkably decreased, and economic benefit is enhanced.

The invention relates to a three-dimensional waterpower vibrator for petroleum drilling, and belongs to the technical field of design of petroleum drilling tools. The three-dimensional waterpower vibrator is composed of a flow control valve, an axial vibrator, a filtering connector, a screw motor power connector and a hydraulic impulse generator. The three-dimensional waterpower vibrator is characterized in that the flow control valve is used for adjusting flow and speed of slurry flowing into the vibrator, the axial vibrator is used for generating displacement upwards along the axial direction, the filtering connector is used for filtering thick slurry components, certain differential pressure is formed in the screw motor power connector by the slurry entering the vibrator to push a rotor structure in a screw motor to rotate and eccentrically vibrate, and the hydraulic impulse generator generates vibration in the circumferential direction through changes of open area circulation between a stationary ring and a moving ring of a PDC thrust bearing. Through three-dimensional vibration simultaneously generated in the axial direction and in the circumferential direction, large well displacement and frictional resistance between a drill column and a well wall of a horizontal well can be effectively overcome, torque between the drill column and the well wall is reduced, jamming of a drilling tool is avoided, and the three-dimensional waterpower vibrator has the advantages that drilling efficiency is remarkably improved and drilling cost is reduced.

The invention discloses a diameter-changeable pulsating heat pipe. The diameter-changeable pulsating heat pipe comprises an evaporation section, a heat insulating section and a condensation section. A pulsating heat pipe vacuumizing opening and a pulsating heat pipe working medium filling opening are formed in the left end and the right end of the condensation section correspondingly. Upper bends and lower bends of the pulsating heat pipe are connected with adjacent main channels with different hydraulic diameters and the main channels with the different hydraulic diameters are distributed and connected in the shape of an S on a whole silicon plate. The diameter-changeable pulsating heat pipe has the advantages of being simple in structure, good in heat transferring performance and easy to miniaturize. Meanwhile, compared with traditional pulsating heat pipes, the outstanding effects that the large pressure difference can be formed more easily compared with the traditional pulsating heat pipes during starting by the aid of the hydraulic diameter differences of the bends of the pulsating heat pipe, frictional resistance and shearing stress are overcome and accordingly the starting time is shortened, the pulsating heat pipe can take more heat away from the evaporation section due to the hydraulic diameter differences of the bends of the pulsating heat pipe compared with the traditional heat pipes, and meanwhile the heat exchange frequency is increased are achieved.

The invention discloses a novel three-point type bending machine hydraulic system with quick energy conservation. One end of a first proportion speed control valve is connected with a first oil port of a first reversing valve; one end of a first energy storage control device is connected in parallel with a rodless cavity of a first main oil cylinder and is connected with the other end of the first proportion speed control valve; the other end of the first energy storage control device is connected in parallel with a rod cavity of the first main oil cylinder and is connected with a second oil port of the first reversing valve; the first energy storage control device is also communicated with an oil tank; one end of a second proportion speed control valve is connected with the first oil port of the first reversing valve; one end of a second energy storage control device is connected in parallel with a rodless cavity of a second main oil cylinder and is connected with the other end of the second proportion speed control valve; the other end of the second energy storage control device is connected with a rod cavity of the second main oil cylinder and is connected with the second oil port of the first reversing valve; the second energy storage control device is also communicated with the oil tank; and the first main oil cylinder and the second main oil cylinder are connected with an upper cutting board at the same time. The novel three-point type bending machine hydraulic system with quick energy conservation has the advantages of simpleness, reliability, quick energy conservation and large tonnage.

The invention relates to a shoulder wedge feeding frame and a front guiding and positioning method thereof. A fixed edge guiding device and method capable of realizing the purpose of pressing downwards, rotating and pushing laterally simultaneously is used for realizing synchronous conveying of two shoulder wedges in limited conveying distance, thereby improving the conveying consistency of the two shoulder wedges to ensure that the two shoulder wedges can be accurately jointed on shoulder positions in parallel. The device is mainly provided with a conveying frame and a conveying template, wherein the conveying template is used for conveying shoulder wedges onto a forming drum and is installed on the conveying frame through a supporting frame. Different from the prior art, at least one group of fixed edge guiding mechanisms are arranged on brackets along the conveying direction of shoulder wedges. The fixed edge guiding mechanisms comprise at least one group of guiding rollers which are axially arranged between brackets at two sides and can axially rotate, and surface rollers of the guiding rollers are spirally arranged along the central line in the transverse direction and the brackets at two sides in the oblique direction. At least two groups of compression rollers which are driven by cylinders are arranged above the guiding rollers in the vertical direction, and the vertical central lines of the guiding rollers and the compression rollers are coincident.

The invention relates to a horizontal grinding mill with built-in classifying turbine, the technical solution of which is that a grinding chamber [18] is filled with grinding medium [6], a medium discharging valve [20] is installed on the middle of the bottom of a cylinder [7], a feeding pipe [10] is above a right end cover [9] of the grinding chamber [18] and a medium discharging pipe [2] is concentrically communicated with the grinding chamber [18] by a left end cover [3]. The length of the cylinder [7] is 1.5 to 2.5 times of the diameter thereof. A fairing [4] is fixedly installed on the left end cover [3] of the grinding chamber [18]. A classifying turbine [5] is vertically installed on the left end of a spindle [13]. A clearance between the classifying turbine [5] and the left end cover [3] is 5mm to 10mm. Five to eight mixing turbines [8] are vertically installed on the spindle [13]. The distance between the mixing turbines [8] decreases gradually from left to right and the right distance is 0.9 to 0.95 times of the left distance. The right end of the spindle [13] is connected with a driving mechanism by the right end cover [9] and a sealing device [11]. The invention has low starting power and can grind and classify with a function of selectively grinding.

The invention provides a symmetric permanent-magnetic suspension system and a permanent-magnetic suspension train rail system. The symmetric permanent-magnetic suspension system is characterized in that I-shaped suspension steel rails 1 made of a magnetic conductive material are arranged in the middle of the system; permanent-magnetic suspension assemblies 15 are symmetrically arranged on two sides of each I-shaped suspension steel rail 1; each permanent-magnetic suspension assembly 15 comprises an upper magnetism collection plate 12, a lower magnetism collection plate 14 and a suspension permanent magnet 13 arranged between the upper magnetism collection plate 12 and the lower magnetism collection plate 14; the magnetic gap of left and right end faces of the upper magnetism collection plates 12 and the lower magnetism collection plates 14 of left and right permanent-magnetic suspension assemblies is equal to that of left and right end faces of the upper yoke plates 2 and lower yoke plates 3 of the I-shaped steel rails 1, and upper and lower directions of the upper and lower magnetism collection plates and upper and lower yoke plates are staggered at a certain interval, so that passive suspension can be realized; left and right I-shaped suspension steel rails 1 are arranged at two ends of a sleeper 11, horizontal guide wheels (8) are arranged on left and right sides of a train; linear motor driving coils (8) are arranged on the rail, and form a two-sided permanent-magnetic linear motor high-efficiency traction train with a traction permanent-magnet on the train, and a safe, superspeed and energy-saving novel rail transition system is constructed.

The invention relates to a train coupler uncoupling device which is used for uncoupling a coupler between adjacent compartments of a rail train. In order to reliably realize the uncoupling operation of the train coupler, the invention provides the train coupler uncoupling device. The train coupler uncoupling device is characterized by comprising an attached rail, a sliding table, a sliding pole, a big arm, a small arm, a wrist and a clamping jaw which are sequentially matched, wherein the attached rail is fixedly arranged beside a rail in the longitudinal direction; the sliding table longitudinally slides along the attached rail, the sliding pole transversely slides along the sliding table, and the big arm vertically slides along the sliding pole; the small arm is articulated with the end of the big arm approaching the rail by a vertical shaft; the rear end of the wrist is articulated with the other end of the small arm by a transverse shaft; the clamping jaw can be installed at the front end of the wrist in a rotating way around the shafts in the front and rear directions of the wrist; and the relative motions of sequentially matched components are all driven by a motor. The train coupler uncoupling device is provided with a train coupler position detecting device and a train coupler shape recognizing device, wherein the train coupler position detecting device controls the motor according to the detected position of the train coupler so that the wrist can extend beside the train coupler; and the train coupler shape recognizing device controls the motor according to the detected shape of the train coupler so that the clamping jaw can clamp the train coupler and rotate.

The invention discloses a mechanical power flow closed type intersecting shaft bevel gear transmission test bench. The mechanical power flow closed type intersecting shaft bevel gear transmission test bench includes an electromagnetic speed regulating motor, a reducer I, a reducer II, a shaft system, and a loading device , coupling group, experimental bevel gear module, base; the reducer I, reducer II, the loading device and the experimental bevel gear module are connected through the shafting and the coupling group, the The reducer I and reducer II are fixed on the base; the reducer I, the coupling IV, the experimental bevel gear module, the coupling V, the reducer II, the coupling The shaft device II, the loading device, and the coupling I constitute a mechanical closed system; the output power of the electromagnetic speed regulating motor is only used to overcome the frictional resistance in the system and supplement various losses; the rotation angle adjustment device can The performance experiments of different bevel gears are carried out, and one machine with multiple functions improves the utilization rate of the test bench.

The invention discloses a hook removal robot with an improved SCARA. The hook removal robot comprises a tri-axis right-angle coordinate moving mechanism, small arms, wrists, claws, a hook position detecting apparatus and a hook shape machine vision identification apparatus, wherein the tri-axis right-angle coordinate moving mechanism is arranged at one side of a rail in parallel; the small arms are hinged to the end, which is close to the rail, of the tri-axis right-angle coordinate moving mechanism by virtue of a vertical shaft and is driven by a fourth motor to rotate around the vertical shaft; the rear end of each wrist is hinged to the other end of the corresponding small arms by virtue of a transverse shaft and driven by a fifth motor to rotate around the transverse shaft; and the claws are installed at the front ends of the wrists and driven by a sixth motor to rotate around a longitudinal shaft of the wrist so as to be opened and closed. The hook removal robot is provided with multiple parts which are successively matched in multiple directions, and is flexible in action, suitable for different real situations, capable of reliably removing a hook, simple in structure, low in cost, and capable of alleviating the labor intensity and improving the working efficiency.

The invention discloses a timing belt durability tester which comprises at least two layers of wheel systems. A mechanical principle is utilized for forming a rotation angle difference in the wheel systems so that a timing notched belt can be realized on a durability tester and different tensions at a loose side and a tense side are kept. Hereon, high matching degree between the force bearing state of the belt and the force bearing state in practical application is realized, and better testing effect is obtained. The timing belt durability tester has advantages of simple structure and low fabrication cost. On the condition that no external load of a driven wheel occurs, an adjustable load is generated in the wheel system, thereby simulating different tension characteristics at the loose side and the tense side. On the condition that no real engine exists, the dynamic tension change characteristic of the belt can be simulated, thereby realizing load power circulation in the wheel system. A motor only requires overcoming the friction resistance of the system, thereby saving energy consumption in driving an air inlet/outlet camshaft by a traditional tester, and realizing ultralow energy consumption.

The invention discloses a novel rotary drum type hydraulic-biological algae-removing device which comprises algae-removing biological incubation chambers, a hydraulic guide wheel, a floating barrel, a rotating shaft and a fixed bracket, wherein the rotating shaft is arranged on the fixed bracket; the rotating shaft passes through the floating barrel and is fixedly connected with the floating barrel; a plurality of algae-removing biological incubation chambers are arranged around the floating barrel; the algae-removing biological incubation chambers and the hydraulic guide wheel are filled with carriers; the hydraulic guide wheel is arranged at the periphery of the algae-removing biological incubation chambers; water through holes are formed between the algae-removing biological incubation chambers as well as between the algae-removing biological incubation chambers and the hydraulic guide wheel; the hydraulic guide wheel integrally adopts a V-shaped cavity structure. The novel rotary drum type hydraulic-biological algae-removing device can transform kinetic energy which enables water to flow into the kinetic energy of the novel rotary drum type hydraulic-biological algae-removing device, can stir a water layer, fulfills the aims of intercepting algae and increasing dissolved oxygen in water, and is particularly suitable for pollution treatment of a flowing landscape water body with few biocenoses.

The invention discloses a magnetic-suspending rotary drumfluid damp measuring apparatus which comprises a motor, a two-dimensional translation support, a cylinder, a rotation speed measuring and controlling instrument, a magnetic-suspending rotary drum, a force moment determinator, a tensile wire, a thin rod, a magnetic field controller, a thermometer, a sealed case and a tray. The motor drives the cylinder to rotate, the rotation speed measuring and controlling instrument controls the rotation speed of the cylinder, the magnetic-suspending rotary drum suspends in a fluid under the effect of a magnetic field produced by the magnetic field controller and is located outside the cylinder, a central shaft is coaxial with the cylinder, the rotating cylinder drives the fluid between the cylinder and the magnetic-suspending rotary drum to rotate, the rotating fluid drives the magnetic-suspending rotary drum to rotate, the thin rod fixed to the magnetic-suspending rotary drum rotates simultaneously, so that the tensile wire wound around the thin rod is slowly wound, finally the force moment of the tensile wire and the force moment of a fluid damp are balanced to make the magnetic-suspending rotary drum stop rotating, and damp coefficients of the fluid are calculated according to the rotation speed, the rotating force moment and other parameters. The magnetic-suspending rotary drumfluid damp measuring apparatus can be used in the field of locomotive manufacturing, aerospace and the like.

The invention discloses a hollow blade. The hollow blade comprises a blade body provided with a cavity. A first flow passing hole and a second flow passing hole are formed in the pressure surface andthe suction surface of the blade body correspondingly, and accordingly gas on the outer side of the pressure surface can penetrate through the cavity and flow to the outer side of the suction surface.The provided hollow blade is provided with the cavity, the cavity can reduce the speed of the airflow flowing through the first flow passing hole and the second flow passing hole, the airflow flows out of the suction surface with the low and uniform speed, and influences of the airflow on main airflow in an impeller runner are reduced.

The invention discloses a forged piece manipulator. The forged piece manipulator comprises a supporting rod. A lifting platform is fixedly connected to the top of the right side of the supporting rod.An electric telescopic rod is fixedly connected to the right side of the lifting plate. The top of the lifting plate is fixedly connected with a motor. The output end of the motor penetrates throughthe lifting plate to extend to the bottom of the lifting plate. The output end of the motor is fixedly connected with a threaded rod. Through arrangement of the motor, the threaded rod, a first threadsleeve, rotary shaft blocks, first connecting rods, a second thread sleeve, second connecting rods and grippers, the forged piece manipulator achieves the effects that a forged piece can be clamped firmly and reliably, the surface quality defects such as impact damage caused by instable clamping of the forged piece are eliminated, and the rejection rate is reduced; accordingly, the problems thata commonly-used clamp only has two fulcrums to make contact with the forged piece and cannot clamp the forged piece unstably, the surface of the forced piece is damaged badly in the transferring process, the labor intensity of workers is large, and the working efficiency is low are solved.

The invention discloses a multi-shaft well cover lock opening device which comprises a drive wheel installed on a main shaft. A driven wheel is driven to rotate by the drive wheel through a middle wheel. The drive wheel and the driven wheel rotate in a coaxial mode but at different speeds. A large transmission rate of a gear system can be achieved through the middle wheel and a bearing, so that the rotary speed of a gear is reduced, the function of small torque inputting and large torque outputting is achieved, and the friction resistance generated by sealing of the shafts of a well cover lock is overcome. The multi-shaft well cover lock opening device solves the problem that an existing well cover lock is difficult to open. The multi-shaft well cover lock opening device is especially designed to open a lock body with a sealing requirement in a labor-saving mode, wherein the lock body with the sealing requirement is difficult to open because of the frictional resistance of a sealing ring.

The invention discloses a portable accurate grinding and sampling device for a concrete surface layer, and belongs to the field of concrete durability monitoring. A sampling mechanism is sequentiallyprovided with a grinding head and a drill bit from front to back, the grinding head and the drill bit are connected into an integrated structure, and the drill bit is connected with a motor rotating shaft through a drill bit mounting seat; a threaded cylinder of an accurate adjusting mechanism is arranged in the outer side of the drill bit mounting base, internal threads matching the threaded cylinder is arranged on the inner wall of a fixed ruler, and the fixed ruler and the threaded cylinder rotate relatively to adjust the relative depth of the grinding head embedded into a sampling layer; and the two ends of a sliding rail of a collecting mechanism are fixedly connected with the drill bit mounting base, and a powder collecting groove is movably arranged on the sliding rail in a sleevingmode to cover the grinding head. The problems that an existing concrete powder sampling device is inconvenient to carry, complex in sampling process operation, and incapable of accurately controllingsampling demand, dust pollution in the sampling process are solved, and the device of the invention is characterized by accurate sampling, simple operation and portability. the device can be used foroutdoor in-situ sampling as well as indoor sampling.

The invention discloses a thermocompressor system which comprises a cylinder, a piston and a linear motor. The piston is positioned in a cylinder body of the cylinder; a spindle of the linear motor is connected with the piston; the end of the cylinder, which is close to the linear motor, is defined into a cylinder body top end and the other opposite end of the cylinder is defined into a cylinder body bottom end; a heater is arranged outside the cylinder body bottom end of the cylinder; a radiator is arranged outside the cylinder body top end of the cylinder; and a working medium is filled in the cylinder body. According to the invention, the linear motor and a thermocompressor are coupled to work and the piston is driven by the linear motor to reciprocate in the cylinder of the thermocompressor so as to push gas to periodically flow between the cold and hot end parts of the cylinder; the cylinder adopts an external heat source to heat the hot end of the cylinder and various energy resources can be utilized; a differential pressure almost does not exist at both ends of the piston and the friction resistance in the reciprocating process of the piston can be overcome only by using the low-power linear motor; and the system has low vibration noise and low emission pollution and has excellent environment properties.

The invention discloses a continuous lifting pump for a pumping unit and a lifting method thereof. The continuous lifting pump comprises a pump cylinder connected to an oil pipe and a piston arranged inside the pump cylinder. The pump cylinder comprises an outer cylinder and a work cylinder arranged inside the outer cylinder in a sleeved mode. The upper end of the piston is connected with a piston rod, then the piston is completely arranged in the work cylinder, and the upper end of the piston rod is connected with a pumping rod. The work cylinder is divided into an upper cavity and a lower cavity by the upper portion and the lower portion of the piston. The annulus is formed between the work cylinder and the outer cylinder, flow guide holes communicated to the annulus are formed in the peripheral side of the bottom of the work cylinder, and the upper end of the annulus is communicated to the oil pipe through an eccentric structure. A radial liquid inlet valve and an axial ring group valve are arranged between the pump cylinder and the oil pipe. The upper cavity is communicated to a shaft through the radial liquid inlet valve and to the oil pipe through the axial ring group valve. According to the continuous lifting pump and the lifting method thereof, continuous liquid drainage of the up-down stroke is achieved, and the purposes of increasing the well yield greatly under the same pump diameter and production parameters, reducing the energy consumption and reducing eccentric wear of an oil well are achieved.

The invention concretely relates to a micro-fine particle grade horizontal grinding device. The grinding device is composed of a grinding chamber and a drive mechanism; the barrel installation center line of the grinding chamber is horizontal and the horizontal length in the barrel is 1.5-2.5 times of the inner circle diameter of the barrel and the inner surface of the barrel is abrasion resistance material and the grinding medium (18) is filled into the barrel; the 5-8 agitating vanes (8) are vertically mounted on the main axle (6) coincident with the barrel center line and a material discharging device is set at the right downside of the left end of the barrel and a material feeding port (7) is set on the right upside of the right end of the barrel; the left end of the main axle (6) is mounted in a bearing liner (13) and the bearing linear (13) is fixed on the center of the left end cover (12) of the barrel and the right end of the main axle (6) passes through a bearing (2) and is connected with the motor by a shaft coupling (1); an accessory impeller (5) is mounted on the main axle (6) of the right side of the barrel. The material pulp of the device is brushed under the high-speed mobile grinding medium colliding, grinding action with features of simple start, large medium energy density and high grinding efficiency.

A shifting control device (23) comprises an inner pole (34). The inner pole not only moves along the direction of the shift selector shaft (32), but also the pole rotates (B) around the axial line (31) of the to link the shift cross (29) and a head potion (28a) of at least one head section (26a) in the shift crosses (29) via the movement (A) and the rotation (B) to build the linkage with the selected shift cross; a brake device (38), the brake device (38) not only flexibly limits the inner pole (34) to form the rotation (B) of the vacant shift rotating position (C) of the reference position, but also the device flexibly limits the angle, the position reaching the rotating positions (D, E) via the rotation (B) of the vacant shift rotating position (C) in the inner pole (34); the inner pole (34) further rotates at the predetermined rotating positions (D, E) to position the inner pole (34). The invention provides a single cross shaft (25). The brake devices such as the brake device (38) are respectively arranged between the potion of the opposite sides along the shift selector shaft (32) in the inner pole and the gear box shell (2).

The automatic controlled self -destructor of syringe, infusion set and hemostix consists of hydraulic transmission part, spring seat, spring, puncture set and part for setting clinical hydraulic value and constraining force parameter. During the use of the syringe, infusion set and hemostix, the self -destructor has action state depending on the set clinical hydraulic value and the difference between the set clinical hydraulic value and the practical hydraulic value and completes self destruction automatically. In the same time, the self -destructor makes the needle seat of the syringe, the infusion set or the hemostix disintegrated automatically, the needle tip withdrawn automatically and the medium passage cut automatically. Therefore, the syringe, the infusion set and the hemostix with the self- destructor are automatic, reliable, convenient and safe.

The invention discloses a plastic grinder for plastic product processing. The plastic grinder structurally comprises a grinder body, a grinding workbench, machine doors, a fixed device and an operation panel. The grinding workbench is composed of a machine cover, a work rotating plate, a driving gear, a rotating rod, adjustable grinding mechanisms, bearing rings, a drive motor and a waste scrap recovery box. The grinding workbench controls the diameter of a pipe orifice clamped by the adjustable grinding mechanisms through the rotating rod, u-shaped grinding seats are driven through rotating of the work rotating plate to grind the edge of the plastic pipe orifice, negative pressure attraction force is generated through a negative pressure fan, plastic dust generated during plastic grindingis absorbed into the bottom of the inner side of the machine cover through mesh holes in the work rotating plate, and plastic dust is prevented from drifting all around; and an anti-overflow mechanism is driven through a rotating shaft to guide plastic dust into dust collection holes through arc guide sheets, and the situation that plastic dust overflows out or flows back out of the grinding workbench, consequently, workers inhale dust, and discomfort is caused is avoided.