36results about How to "Effective unloading" patented technology

The invention relates to a vane pump applied to a plastic injection machine. The vane pump comprises a pump body, wherein a transmission shaft, a rotor and a stator are arranged in the pump body; vanes are uniformly distributed between the rotor and the stator; an oil distribution disc is arranged at two sides of the rotor and comprises an oil suction distribution disc and an oil pressing distribution disc; an oil cavity is formed among the rotor, a stator, the vanes and the oil distribution disc; the oil cavity is divided into an oil suction zone, an oil pressing zone and a seal zone according to the state and function of the vane pump when the vane pump rotates positively and works; the seal zone is arranged between the oil suction zone and the oil pressing zone; an oil hole is formed in the rotor or the oil distribution disc which forms the oil suction zone. The invention provides the vane pump which is applied to the plastic injection machine, is simple in structure, capable of adapting frequent machine halts and long in service life; moderate negative rotation of the vanes is allowed and the noise is reduced when the vanes rotate negatively; the technical problem that in the prior art, an existing vane pump is too complex in structure and large in negative rotation noise, the negative rotation of the vanes are not allowed and the service life is impacted is solved.

The invention belongs to the technical field of cement production, and particularly relates to bulk cement discharging equipment. According to the bulk cement discharging equipment, through a manner that a bottom plate is provided with an oblique material receiving plate, a conveyor belt, a material receiving frame, a slotting unit, an oblique plate unit and a frame fixing unit, effects that bulkcement is effectively discharged and sufficiently packaged are achieved. The bulk cement discharging equipment has the advantages that a discharged material receiving and conveying structure is high in stability, a material leaking prevention effect is good, after preset weight in the material receiving frame is reached, a light is lightened, a prompting effect is good, a light lighting trigger structure is reasonable and effective and high in automation degree, taking and putting operation of the material receiving frame is convenient, the whole discharging and weighing effects are good, andit is guaranteed that the weight difference value of finally bagged cement is small.

The invention discloses a vane pump suitable for an injection molding machine. The vane pump comprises a pump body, a transmission shaft is arranged in the pump body, the transmission shaft is sleeved with a rotor, a stator is arranged outside the rotor, vane grooves are formed in the rotor, vanes are evenly distributed between the rotor and the stator, and the vanes are located in the vane grooves. Oil distribution discs are arranged on the two sides of the rotor, and comprise an oil suction distribution disc and an oil pressing distribution disc located on the two sides of the rotor, an oil cavity is formed among the rotor, the stator, the vanes and the oil distribution discs, and lubricating oil holes are formed in the vane grooves, and are close to one side of the oil cavity. The vane pump is simple in structure, the continuity of oil films on the surfaces of the vanes is increased, abrasion of the vanes and the vane grooves is reduced, noise is lowered, and a pump biting phenomenon is not likely to happen. The technical problems that in the prior art, a vane pump is poor in lubricating effect, the continuity of oil films formed on vanes is poor, and consequently abrasion of the vanes and vane grooves is accelerated are solved.

The invention discloses a numerical control paper stacker, which comprises a reel paper cutter, wherein one side of the reel paper cutter is provided with a ventilated belt feeder; the belt feeder is mounted with a driving device and connected with a positive and negative pressure air device; and a lift platform is arranged under the belt feeder. The paper stacker has high design accuracy and can realize full automatic misplacement superposition of aramid paper.

The invention discloses an antiskid modified bridge deck paving material and a preparation method thereof, which belongs to the field of building materials. The preparation method comprises the following steps: by counting in parts by weight, respectively weighing epoxy resin, dispersed curing liquid, silicate cement, stone particles, polycarboxylic acid water reducer and rubber particles, stirring, mixing, then laying the mixture on a bridge deck after the stirring and the mixing are finished, standing, curing, and naturally maintaining, thus obtaining the antiskid modified bridge deck paving material. The antiskid modified bridge deck paving material has the beneficial effects that the friction coefficient is large, and the corrosion resistance is good (chemical stability is good), and the paving material has relatively good antiskid performance and durability and is worth of being popularized to use.

The invention discloses a pre-twisted fitting for an aerial optical cable, relating to the field of electric power fittings. The optical cable comprises mounting brackets, movable assemblies, a supporting piece, a left fixing assembly, a right fixing assembly and an optical cable assembly. The supporting piece is fixedly arranged in the middles of the mounting brackets, and the two movable assemblies are movably installed on the mounting bracket on the two sides of the supporting piece. The left fixing assembly and the right fixing assembly are connected with the movable assemblies on the twosides respectively, the optical cable assembly penetrates through the left fixing assembly, the supporting piece and the right fixing assembly to be fixedly connected, and the supporting piece is fixedly connected with the left fixing assembly and the right fixing assembly through rigid springs respectively. Through the spiral line structure of the inner and outer double-layer twisted wires, the grip to the optical cable is improved, and the reliability of optical cable connection is ensured; and meanwhile, the wind resistance and the pulling resistance of the connected cable are improved while the rigid strength of connection is ensured, the optical cable is prevented from being broken due to too strong stress, and the service life of the optical cable is prolonged.

The invention is applicable to the technical field of steel pipe machining, and provides automatic punching and drilling integrated loading and unloading equipment. The automatic punching and drillingintegrated loading and unloading equipment comprises a supporting device, a fixing device, a punching device, a drilling device and an automatic conveying device, wherein the supporting device comprises a supporting frame and a plurality of guide seats; the punching device is positioned at one side of a left fixing piece; the drilling device is positioned at one side of the punching device; the automatic conveying device comprises a conveyer and a discharging device; and the discharging device comprises symmetrical moving devices, the moving devices comprise bottom plates, telescopic pieces,a plurality of connecting rods and guide rods, the connecting rods comprise a first connecting rod and second connecting rods, one ends of the second connecting rods are movably connected with the output ends of the telescopic pieces, the other ends of the second connecting rods are connected with the guide rods through fixing blocks, the ends of the telescopic pieces are movably connected with the guide rods, and the bottom plates are positioned below guide seats. In this way, the automatic punching and drilling integrated loading and unloading equipment realizes automatic guiding transportation and automatic discharging transportation of steel pipes, meanwhile, realizes automatic drilling and punching, and improves working efficiency.

The invention discloses a pressure relieving pipeline which comprises a pipeline body, wherein a first connecting pipe is fixedly connected to the side wall of the pipeline body; the first connectingpipe communicates to the inner cavity of the pipeline body; a first fixed block is fixedly connected to the side wall of the first connecting pipe; a second connecting pipe is arranged on the upper side of the first connecting pipe; a second fixed block is fixedly connected to the side wall at the lower end of the second connecting pipe; the second fixed block leans against the first fixed block;the second fixed block and the first fixed block are fixedly connected through a bolt; two sliding chutes are symmetrically formed in the inner wall of the second fixed block; slide blocks are slidably connected in the two sliding chutes; and a baffle plate is fixedly and jointly connected to the two slide blocks. The pressure relieving pipeline disclosed by the invention is simple and reasonablein structure, and can unload effectively to reduce the dynamic load acted to the inner wall of the pipe, so that the service life of the pipeline is prolonged favorably. Meanwhile, the pressure relieving pipeline is provided with an alarm device, so that the alarm device can raise the alarm when the change of pressure is relatively great.

The invention discloses a novel RGV (Rail Guided Vehicle) material conveying system, and belongs to the technical field of automatic conveying. The novel RGV material conveying system comprises an RGV, a hopper, a hollow chain scraper conveyor and a temporary storage hopper, wherein the hopper is arranged on the RGV, and granular materials are stored in the hopper; the hollow chain scraper conveyor is arranged on the side of the RGV and used for bearing and transporting a car hopper conveyed by the RGV; a temporary storage hopper is arranged below the hollow chain scraper conveyor; the temporary storage hopper is arranged below the hollow chain scraper conveyor; and the upper end and the lower end of the temporary storage hopper are in butt joint with the hopper respectively. According to the novel RGV material conveying system, material transportation and unloading are guaranteed under the condition of large elevation fall, so that the automation degree and the material conveying efficiency are improved. The material conveying system is reasonable in design and wide in application range.

The invention discloses a flexible unloading device which is used for uniformly unloading vertical pump pipe force for concrete conveying of high-rise buildings. The flexible unloading device comprises a base, a rubber base plate, a force transmission device and a rubber gasket, wherein each component is composed of two symmetrical parts, so that the unloading device is convenient to mount and dismount; the base is attached to the upper surface of a poured component; the force transmission device is arranged at the upper part of the base; the rubber base plate is arranged between the force transmission device and the base; the force transmission device is arranged on the outer side of a pump pipe; and the rubber gasket is arranged between the force transmission device and the pump pipe. According to the flexible unloading device, through uniform layer-by-layer unloading, damage to the pump pipe and damage to a floor slab due to stress concentration are prevented.

The invention discloses a device for reducing load of a farmer carrying a medicine box. The device comprises the medicine box and a pressure reducer carried on the human body to support the medicine box, wherein the pressure reducer comprises a supporting base, a damping mechanism positioned at the upper end of the supporting base and waistbands positioned on the two sides of the supporting base;the two ends of each waistband are provided with buckles correspondingly inserted; the damping mechanism comprises a buffer base horizontally arranged at the upper end of the supporting base; a sliding groove allowing the supporting base to be embedded therein and capable of sliding in the vertical direction is formed in the bottom of the buffer base; and an installation groove right facing the sliding groove is formed in the supporting base. The damping mechanism further comprises a main damping component arranged in the installation groove. The pressure reducer supports the medicine box, sothat most gravity of the medicine box is transmitted to the pressure reducer, the waist and the back are stressed, a small part of gravity is transmitted to the shoulders through straps, the load of the shoulders of the human body is effectively reduced, workers can carry the medicine box very conveniently, and the fatigue feeling cannot be generated within a short time.

The invention discloses a pomelo tree branch support frame, which comprises a support platform, the lower end of the support platform is symmetrically fixed with support legs, the uppermost end of the support legs is rotatably engaged with a hollow connecting column, and the inner side of the hollow connecting column is A pin body is plugged in, and the pin body traverses the hollow connecting column, the lower end of the hollow connecting column is rotatably fitted with a rotating disc, the bottom end of the supporting leg is fixed with a floor sprocket, and the upper end surface of the supporting platform There are two supporting bodies evenly and symmetrically fixed, and a fixed cross bar is fixedly connected between the supporting bodies. The supporting body includes a telescopic column. A rotating base is installed on the end of the column facing away from the supporting platform, and a U-shaped supporting bracket is fixed on the end surface of the rotating base facing away from the telescopic column. The invention can effectively support and help the overwhelmed branches full of pomelo.

The present invention discloses a peach kernel integrated manufacturing device and a working method thereof. The device comprises an air compressor, a high-pressure air transmission pipeline, high-pressure air spray nozzles, a feeding port and an unloading plate; the high-pressure air transmission pipeline is arranged above the air compressor; the high-pressure air spray nozzles are arranged at one end of the high-pressure air transmission pipeline; and the unloading plate is arranged at the middle part above the feeding port. The device is scientific and reasonable in structure and safe and convenient to use, is provided with the air compressor, the high-pressure air transmission pipeline and the high-pressure air spray nozzles, can effectively realize the stirring of the peaches in boiling water, not only realizes the full stirring of the peaches, enables the peaches to be heated uniformly in the boiling water so as to facilitate later treatment, but also can effectively avoid the collision between a stirring frame and the peaches when the peaches are stirred by using the stirring frame, wherein the collision results in peach surface damage and esthetic effection; and the deviceis provided with a folded plate and the unloading plate, can effectively unload the peaches inside a transportation basket, does not need manual unloading, and greatly reduces the waste of manpower.

The invention discloses a subway shield construction surface collapse monitoring device based on the Internet of Things, and belongs to the technical field of surface collapse monitoring. A subway shield construction surface collapse monitoring device based on the Internet of Things comprises a placement box, a placement plate is arranged in the upper end of a fixing plate, a machine body is fixedly arranged on the top surface of the placement plate, a transparent cover is arranged above the machine body, a cleaning assembly is arranged on the outer side of the transparent cover, and a motor is fixedly arranged on the bottom surface of the fixing plate. The machine body can be protected in the transportation and use process, damage caused by collision in the transportation and use process can be effectively avoided, a cover plate can be driven to be opened upwards by pulling a handle when needed, the machine body can be moved out of a containing box through a fixing plate connected through a supporting rod, and the situation that the machine body is damaged in a construction tunnel can be avoided. Falling objects are blocked and prevented from falling onto the transparent cover to damage the machine body, and the transparent cover can greatly shorten the service life of the machine body in an environment with a large amount of dust.

The invention belongs to the technical field of ships, and particularly relates to a ship anti-collision device. The ship anti-collision device is characterized in that the ship anti-collision devicecomprises a bottom plate, the bottom plate is fixedly connected with a hull through a bolt hole, a fastening bolt is arranged in the bolt hole, the bottom plate is connected with a mounting plate through a plurality of airbags, the end, away from the bottom plate, of the mounting plate is fixedly connected with a force unloading plate, the force unloading plate is fixedly connected with an arc-shaped rubber plate through a binding layer, a buffering layer is arranged between the bottom plate and the hull and made of rubber, one ends of the airbags are fixedly connected with the bottom plate, the other ends of the airbags are fixedly connected with the mounting plate, the mounting plate is fixedly connected with the force unloading plate through a bolt, the bottom plate is provided with a plurality of guiding columns, the mounting plate is provided with guiding column holes, the guiding columns penetrate through the guiding column holes, the airbags supply air through an external air pump, the upper surface of the arc-shaped rubber plate is an arc surface, and the lower surface of the arc-shaped rubber plate is a flat surface. According to the ship anti-collision device, the damageto the ships during collision can be reduced.

The invention discloses a fertilizer applying device allowing fertilizer to be mixed and convenient to move. The fertilizer applying device comprises a base, a box body, a motor and fixing screws. A pushing rod is arranged at one end of the base, connecting rods are perpendicularly installed at the other end of the base, the motor is perpendicularly installed at one end of the box body, the fixingscrews are arranged on one side of the motor, the ends, away from the base, of the connecting rods are sleeved with universal wheels, the fixing screws penetrate through and are inserted into one endof the base, and a water box is fixedly installed between the fixing screws. The fertilizer applying device allowing the fertilizer to be mixed and convenient to move is provided with the motor, a secondary rotary shaft and stirring blades, the motor drives the second rotary shaft to rotate to drive the stirring blades to rotate, in this way, the fertilizer inside the device is convenient to stirand treat, and is mixed more rapidly, the working efficiency of the device is improved, and the device is more convenient to use.

The invention discloses a plow discharger. The plow discharger comprises a gantry, a big connecting rod, a round connecting rod, a lift cylinder seat, a lift cylinder, a long connecting rod, a pin shaft, a hoisting rod, a carrier roller frame, lower brackets, short connecting rods, rotating cylinder seats, rotating cylinders, colters, a left colter plate, a right colter plate and an adjustable carrier roller frame, wherein the carrier roller frame is connected to the gantry through the long connecting rod, the round connecting rod, the big connecting rod, the pin shaft and the hoisting rod, the carrier roller frame is connected to the lower brackets through the short connecting rods, the lift cylinder seat is in threaded connection with the gantry, the rotating cylinder seats are in welded connection with the colters, the left colter plate and the right colter plate are connected with the colters through long pins, and the adjustable carrier roller frame is in threaded connection with the lower brackets. The plow discharger provided by the invention can effectively discharge under various execrable conditions, and can ensure discharging of all on-site stock bins in virtue of the changeable colters, so that the all stock bins do not need other discharge manners, and the discharge direction of materials on a line belt can be changed by changing the direction of the colters.

The invention discloses a mobile dumping dolly which comprises a big frame, a bearing pedestal, an axletree, wheels, a plowshare assembly, a rear axes brake mechanism and a hydraulic power station, wherein the bearing pedestal is in bolted connection with the big frame, the axletree is mounted in the bearing pedestal, the wheels are connected to the shaft through keys, and the plowshare assembly, the rear axes brake mechanism and the hydraulic power station are welded on the big frame. According to the dolly provided by the invention, effective dumping can be realized under various severe environments, especially the arrangement of the rear axes brake mechanism better solves the problem that the dolly move back and forth as the braking friction of the dolly is insufficient, so as to enable the dumping to be more stable and the efficiency to be improved greatly.

The invention relates to a high-strength support structure of a stone curtain wall. The high-strength support structure comprises a steel plate and a base connected with the steel plate though bolts,the steel plate is embedded in an outer wall body, and one side face of the steel plate is exposed out; the high-strength support structure further comprises a connecting rod and a support device, theconnecting rod is slidingly connected to the base in the direction perpendicular to the base, one end of the support device is connected with the connecting rod, the other end of the support device is connected with the steel plate through bolts, and a fixing device for installing a stone plate is connected to the rod end of the connecting rod; and the fixing device is connected with a buffer device, one end of the buffer device abuts against the center of the bottom face of the stone plate, and the other end of the buffer device is connected to the steel plate. The high-strength support structure has the effects of good seismic support performance and the stable structure. The problem that the destructive effect on the wall body is large and the stability of the support structure is poorunder the air pressure are solved.

The invention discloses a vane pump suitable for injection molding machines, which includes a pump body, a transmission shaft is arranged in the pump body, a rotor is sleeved on the transmission shaft, a stator is arranged outside the rotor, and vane grooves are opened on the rotor. There are blades evenly distributed between the rotor and the stator, and the blades are located in the blade grooves. There are oil distribution plates on both sides of the rotor. The oil distribution plates include oil suction oil distribution plates and pressure oil distribution plates on both sides of the rotor. , The space between the stator, the vane and the oil distribution plate forms an oil cavity, and a lubricating oil hole is opened on the vane groove, and the lubricating oil hole is close to the side of the oil cavity. The invention provides a vane pump with a simple structure, which increases the continuity of the oil film on the surface of the vane, reduces the wear of the vane and the vane groove, reduces the noise, and is not easy to produce the phenomenon of biting the pump; it solves the problem of lubrication of the vane pump in the prior art The effect is not good, and the continuity of the oil film formed on the blade is not good, thereby accelerating the technical problem of the wear of the blade and the blade groove.

The invention discloses a hydraulic negative flow control loop and method, an executing mechanism and a system. The control loop comprises an unloading loop, a first negative flow control loop and a second negative flow control loop. The unloading loop is connected to a hydraulic oil tank and an oil outlet of a corresponding variable pump in parallel, and used for enabling hydraulic oil output by the variable pump to reach the hydraulic oil tank through the unloading loop under the situation that a hydraulic system action signal is not received. The first negative flow control loop is connected to a corresponding variable pump regulator and an oil inlet of a corresponding negative flow throttling hole in parallel, and the second negative flow control loop is connected to an oil outlet of a pilot pump and a corresponding variable pump regulator in parallel and used for sending pressure signals generated by the oil outlet of the pilot pump to the corresponding variable pump regulator under the situation that the hydraulic system action signal is not received. According to the hydraulic negative flow control loop and method and the executing mechanism and system, the displacement and the output pressure of the variable pump are reduced to be minimal at the same time under the situation that the hydraulic system action signal is not received, and complete unloading of the system is achieved.

The invention discloses a flexible unloading device, which is used for uniform unloading of the vertical pump pipe force of concrete conveying in high-rise buildings. It includes a base, a rubber backing plate, a force transmission device and a rubber washer. , to facilitate the installation and disassembly of the unloading device; the base is attached to the upper surface of the cast member, the force transmission device is arranged on the upper part of the base, a rubber pad is arranged between the force transmission device and the base, and the force transmission device is set On the outside of the pump tube, a rubber gasket is arranged between the force transmission device and the pump tube. The device unloads uniformly layer by layer to prevent damage to the pump tube and damage to the floor due to stress concentration.

The invention discloses a tool placing rack for constructional engineering. A casing is arranged on the outer surface of the upper end of a main body; a protective net is arranged on one side of the inner wall of the casing; a lifting rail is arranged on the outer surface of the front end of the casing; a movable fixing block is arranged on the outer surface of the front end of the lifting rail; ahigh-strength supporting plate is arranged on the outer surface of the front end of the movable fixing block; a protective plate is arranged on the outer surface of the upper end of the casing; the movable fixing block comprises a movable block, a screw hole, a positioning hole and a sliding block; and the high-strength supporting plate comprises an oak plate, varnish and a protective film. According to the tool placing rack for constructional engineering, the height of the supporting plate can be adjusted at will through the sliding block adopted by the movable fixing block, and the supporting plate is fixed through the positioning hole after being adjusted, so that the product has certain flexibility, then convenience is effectively brought to work, and the tool placing rack for constructional engineering has a better using prospect.

The automatic detecting device for unloading of bulk cement train can detect and judge the bulk cement unloading status accurately. The automatic detecting device has sensor set on the bulk cement conveying pipeline and the probe of the sensor is set inside the bulk cement conveying pipeline. By means of the detection of the probe, the material conveying status may be judged accurately. The sensor can send out signal to control the on-off of the air compressor and other relevant signal for the relevant person to operate further. The present invention can raise the unloading efficiency, avoid pipeline jamming caused by residual material, prolong the service life of the air compressor and save power.

The invention relates to the technical field of power equipment, and discloses a stable switch cabinet with a shockproof function. The cabinet comprises a cabinet body, a stabilizing device and a shockproof device. The cabinet body is of a cuboid structure. A cabinet door is welded to the front left side of the cabinet body through hinges. A handle is welded to the right side of the front of the cabinet door. Four insulated electric appliance mounting plates are clamped in the cabinet body in parallel at equal intervals. The interior of the cabinet body is divided into a bus chamber, a relay instrument chamber, a cable chamber, a circuit breaker chamber and a safety chamber from top to bottom by the insulating electric appliance mounting plate. A stabilizing device is welded at the bottomin the cabinet body. An anti-vibration device is welded below the cabinet body. According to the switch cabinet, the problems that in the prior art, a switch cabinet is insufficient in shockproof function and not high in stability are solved, and the shockproof stability of the switch cabinet can be effectively improved.

A large gear two-side bearing withdrawing machine comprises a machine frame, oil cylinder devices, a withdrawing device, a material supporting trolley, a material supporting trolley chassis and a transition tool. The machine frame is in a concentric-square shape, and inserting plate grooves are correspondingly formed in an upper cross beam and a lower cross beam of the machine frame; the oil cylinder devices are coaxially and symmetrically arranged at the two ends of the machine frame in a centered manner and are provided with centre mechanisms. the withdrawing device is arranged at one side of the machine frame, a hanging seat of the withdrawing device is arranged above the upper cross beam of the machine frame, a first driving mechanism is arranged on the hanging seat, an inserting plateis arranged below the hanging seat, a second driving mechanism and a second guiding device are arranged in front of the hanging seat, the first guiding device is arranged between the hanging seat andthe inserting plate, and a rack is arranged on the inserting plate; a U-shaped opening is formed in the side of the inserting plate, and the height of the opening is larger than the diameter of a train axle; and the transition tool is a cylinder formed by fixing two halves through bolts, and a clamping groove is formed in the outer circle of the cylinder. The withdrawing machine is simple and reasonable in structure, can effectively complete withdrawing machine of bearings at the two sides of a large gear, and fills the technical and market gaps.

A single way clutch twisting combustion engine comprises a block and the piston propeller drive mechanism, force discharging device, lubricating and cooling system on the block. Inside the said block, there are cylinders with pistons connecting with the propeller shaft through piston pins inside, with the said propeller having inside racks and lower linking bars and the mating of the teeth at the center of the ratchet with the racks. Both ends of the ratchet shaft connects with cylinders through bearings, with one having ratchets that mate with the middle gear of the block. Upper end of the said linking bar connects with the lower part of the propeller, the lower part of the linking bar connects with the force discharging disk at the lower part inside the block through bearings, the force discharging disk locates on the block through force discharging shaft and bearings. Outside the force discharging shat, there are force discharging ratchet that mates with the middle gear on the block. It improves mechanical efficiency and extends durability.

The invention relates to the technical field of guardrails, in particular to a buffering anti-collision warning guardrail for road and bridge construction, which comprises a base, a guardrail plate, a primary damping assembly, a secondary damping assembly and a silencing assembly arranged on one side of the guardrail plate, and a vertical part of the guardrail plate is fixed on the base; the damping guardrail has the beneficial effects that the primary damping assembly and the secondary damping assembly directly face a lane, the silencing assembly directly faces a road and bridge construction site, the base is fixed to the designated ground position, and when a vehicle rushes to the guardrail plate, the primary damping assembly is used for conducting primary force unloading and damping on the vehicle; secondary force unloading and shock absorption are conducted on the vehicle through the secondary shock absorption assembly, and noise generated in the road and bridge construction process is isolated through the noise reduction assembly; damping and force unloading can be effectively carried out on vehicles, major traffic accidents are prevented, noise reduction can be effectively carried out in the road and bridge construction process, and the road and bridge construction requirements are fully met.

The invention relates to a vane pump applied to a plastic injection machine. The vane pump comprises a pump body, wherein a transmission shaft, a rotor and a stator are arranged in the pump body; vanes are uniformly distributed between the rotor and the stator; an oil distribution disc is arranged at two sides of the rotor and comprises an oil suction distribution disc and an oil pressing distribution disc; an oil cavity is formed among the rotor, a stator, the vanes and the oil distribution disc; the oil cavity is divided into an oil suction zone, an oil pressing zone and a seal zone according to the state and function of the vane pump when the vane pump rotates positively and works; the seal zone is arranged between the oil suction zone and the oil pressing zone; an oil hole is formed in the rotor or the oil distribution disc which forms the oil suction zone. The invention provides the vane pump which is applied to the plastic injection machine, is simple in structure, capable of adapting frequent machine halts and long in service life; moderate negative rotation of the vanes is allowed and the noise is reduced when the vanes rotate negatively; the technical problem that in the prior art, an existing vane pump is too complex in structure and large in negative rotation noise, the negative rotation of the vanes are not allowed and the service life is impacted is solved.