Double-screw-rod electric storage mechanism of injection molding machine

Abstract

The invention relates to the technical field of injection molding machines, and discloses an injection molding machine double-screw electric storage mechanism, which comprises an injection molding machine main body, a shell and an electric driving device, and is characterized in that the upper part of the injection molding machine main body is fixedly connected with the shell, the inner surface of the shell is provided with a double-screw electric extrusion device, and the upper end of the shell is fixedly connected with a storage port; a pneumatic discharging device is arranged in the material storage opening, a dust blocking device is arranged in the material storage opening, and the pneumatic discharging device comprises a draught fan. According to the plastic fluid discharging device, through the arrangement of the pressure release valve, the fixing shaft, the air nozzle, the draught fan, the exhaust pipe and the connecting block, control over discharging of the storage port through an electric control valve in the prior art can be replaced, meanwhile, in the discharging process, plastic fluid is pushed through inert gas, and the discharging speed of the plastic fluid can be remarkably increased; and the double-screw-rod electric extrusion device can be matched to transfer materials, so that the efficiency of a material injection process in the injection molding machine is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding machines, and particularly to a double-screw electric material storage mechanism for an injection molding machine. Background Art

[0002] An injection molding machine, also known as an injection molding press or an injection machine, is the main molding equipment for forming various shaped plastic products using thermoplastic or thermosetting plastics with a plastic molding die. It mainly consists of an injection system, a clamping system, a hydraulic transmission system, an electrical control system, etc. During operation, the plastic raw material is heated and melted in the barrel of the injection system, and through the push of the screw, it is injected into the closed mold cavity at high pressure and high speed. After pressure holding and cooling and solidification, the clamping system opens the mold, and the ejection mechanism ejects the formed plastic product to complete an injection molding cycle. Injection molding machines are widely used in many industries such as automotive, electronics, medical, packaging, etc., and produce various plastic products such as plastic toys, mobile phone casings, disposable syringes, plastic bottles, etc., and are key equipment indispensable in the modern plastic processing industry.

[0003] During actual use, the plastic fluid waiting to be injected will be stored inside the material storage port, and its entry into the injection molding machine for injection molding operations is controlled by an electric control valve.

[0004] However, during actual use, due to the certain viscosity of the plastic fluid itself, its entry into the injection molding machine is relatively slow, and it is extremely easy to adhere to the inner wall of the material storage port to form solid lumps, thus hindering the normal injection molding efficiency of the injection molding machine. Therefore, a double-screw electric material storage mechanism for an injection molding machine is proposed to solve the above problems. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a double-screw electric material storage mechanism for an injection molding machine, which solves the problems in the prior art that due to the certain viscosity of the plastic fluid itself, its entry into the injection molding machine is relatively slow, and it is extremely easy to adhere to the inner wall of the material storage port to form solid lumps.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A double-screw electric material storage mechanism for an injection molding machine, including an injection molding machine main body, a housing, and a double-screw electric extrusion device. The upper part of the injection molding machine main body is fixedly connected with a housing, the inner surface of the housing is provided with a double-screw electric extrusion device, the upper end of the housing is fixedly connected with a material storage port, the inside of the material storage port is provided with a pneumatic discharging device, and the inside of the material storage port is provided with a dust blocking device;

[0007] The pneumatic discharging device includes a fan, a discharge pipe is fixedly connected to the front end of the fan, a pressure relief valve is fixedly connected to the side of the discharge pipe away from the fan, a connecting block is fixedly connected to the upper part of the pressure relief valve, a fixed shaft is fixedly connected to the inner side of the connecting block, and a nozzle is fixedly connected to the upper end of the outer arc surface of the fixed shaft.

[0008] Preferably, the dust-proof device includes a baffle, an inner shaft is fixedly connected to the inner side of the baffle, an outer shaft is rotatably connected to the outer arc surface of the inner shaft, a sealing plate is fixedly connected to the outer arc surface of the outer shaft, and a limiting block is fixedly connected to the inner side of the baffle.

[0009] Preferably, the lower end of the material storage port is connected to a double-screw electric extrusion device, the pneumatic discharging device is located below the dust-proof device, and the outer surface of the fan is fixedly connected to the material storage port.

[0010] Preferably, the outer surface of the discharge pipe is fixedly connected to the connecting block, one end of the discharge pipe away from the fan is communicated with the fixed shaft, the discharge pipe is fixedly connected to the air outlet of the fan, and through holes having the same shape as the internal discharge pipe are opened in both the connecting block and the pressure relief valve.

[0011] Preferably, the connecting block is integrally circular, the lower surface of the fixed shaft is fixedly connected to the pressure relief valve, a plurality of groups of through holes are opened in the upper part of the outer arc surface of the fixed shaft, and the nozzle is integrally arranged in an inclined shape.

[0012] Preferably, the outer arc surface of the baffle is fixedly connected to the material storage port, a rectangular groove is opened in the inner side of the baffle, the diameter of the inner shaft is smaller than that of the outer shaft, a through hole is opened in the inner surface of the outer shaft, the inner arc surface of the outer shaft is elastically connected to the inner shaft through a scroll spring, the outer surface of the sealing plate is in close contact with the baffle, and the upper part of the sealing plate is in contact with the limiting block.

[0013] Preferably, the double-screw electric extrusion device includes a connecting frame, guide rods are slidably connected to both the front and rear sides of the connecting frame, a fixed rod is fixedly connected to the inner surface of the connecting frame, a screw rod is fixedly connected to the right side of the guide rod, and a driving wheel is fixedly connected to the right side of the screw rod.

[0014] Preferably, the limiting block is integrally arranged in an arc shape, and one end of the sealing plate close to the material storage port is arranged in an arc shape.

[0015] Preferably, a rotary pneumatic discharging device is arranged inside the material storage port, the rotary pneumatic discharging device includes a rotary shaft, a reverse thrust nozzle is fixedly connected to the upper end of the outer arc surface of the rotary shaft, a brush plate is fixedly connected to the outer arc surface of the rotary shaft, an inner bearing is fixedly connected to the lower end of the outer arc surface of the rotary shaft, an outer bearing is rotatably connected to the outer arc surface of the inner bearing, and an air chamber is rotatably connected to the lower surface of the inner bearing.

[0016] Preferably, a plurality of groups of through holes are provided in the upper part of the outer arc surface of the rotating shaft. The inside of the rotating shaft is hollow. A through hole is provided in the lower part of the rotating shaft. The lower part of the rotating shaft communicates with the inner bearing. A through hole is provided in the inner arc surface of the inner bearing. An arc-shaped through hole is provided in the lower part of the inner bearing. A through hole is provided in the upper part of the air chamber. The outer arc surface of the air chamber communicates with the exhaust pipe. The outer arc surface of the air chamber is fixedly connected to the pressure relief valve. The exhaust direction of the reverse thrust nozzle is inclined downward along the tangent direction of the rotating shaft. The brush plate is integrally provided as an inclined arc-shaped plate. The lower part of the outer bearing is fixedly connected to the pressure relief valve.

[0017] Working principle: When the device is in use, it is necessary to inject the heated plastic into the material storage port through an external feeding device. At this time, due to the pressure of the plastic fluid above, the pressure at the upper end of the sealing plate will be greater than the elastic force of the scroll spring. At this time, the sealing plate will drive the outer shaft to rotate accordingly, and the plastic fluid can enter the interior of the material storage port. When the injection is completed, since the amount of the plastic fluid above gradually decreases, the pressure above the sealing plate gradually decreases. At this time, the scroll spring will drive the outer shaft and the sealing plate to rotate in the reverse direction through its own elastic force until the sealing plate contacts the limit block, thereby maintaining the tightness of the upper part of the material storage port and reducing the possibility of dust and impurities in the external environment contacting the plastic fluid during the storage process and causing pollution to it.

[0018] At the same time, when it is necessary to inject the plastic fluid stored in the material storage port into the double-screw electric extrusion device, the fan can be started to input the inert gas into the exhaust pipe, and the inert gas is input into the material storage port through the exhaust pipe to increase the internal air pressure. At this time, since the internal air pressure of the material storage port increases, the pressure relief valve will exceed its set pressure relief threshold and automatically remain open. The plastic fluid in the material storage port will also accelerate downward under the push of the air pressure, thereby improving its feeding speed and feeding efficiency.

[0019] In the second embodiment, the inert gas driven when the fan is started will enter the air chamber through the exhaust pipe, pass through the inner bearing and the rotating shaft, and finally enter the reverse thrust nozzle. Since the diameter of the exhaust port of the reverse thrust nozzle is small, the high-pressure inert gas can be further pressurized and ejected. The reaction force of the ejected gas will provide a force in the tangent direction of the rotating shaft and drive the rotating shaft to rotate accordingly. When the rotating shaft rotates, the brush plate on the outer arc surface will be driven to rotate synchronously, and during the rotation of the brush plate, it will scrape the inner wall of the material storage port, thereby preventing the plastic fluid from adhering to its inner surface and further pushing the plastic fluid inside the material storage port to assist its discharging. At the same time, under the action of the rotational centrifugal force, the plastic fluid is not easily adhered to the surface of the brush plate.

[0020] The present invention provides a double-screw electric material storage mechanism for an injection molding machine, with the following beneficial effects:

[0021] 1. By setting a pressure relief valve, a fixed shaft, a gas nozzle, a blower, an exhaust pipe, and a connecting block, the present invention can replace the control of the material discharging at the material storage port through an electric control valve in the prior art. Meanwhile, during the material discharging process, the pushing of the plastic fluid by the inert gas can significantly increase the discharging speed of the plastic fluid and can cooperate with the double-screw electric extrusion device for material transfer, thereby improving the efficiency of the material injection process inside the injection molding machine.

[0022] 2. By setting a rotating shaft, a reverse pushing gas nozzle, a brush plate, an air chamber, an outer bearing, and an inner bearing, the present invention can, while the blower inputs gas into the air chamber, convey the gas to the reverse pushing gas nozzle through the inner bearing and the rotating shaft, and drive the overall rotation of the rotating shaft by the reaction force of the gas ejected from the reverse pushing gas nozzle. Thus, during the process of pressurizing the inside of the material storage port, the inclined arc-shaped brush plate is driven to rotate, thereby further accelerating the discharging speed of the plastic fluid inside the material storage port through the extrusion and the rotation of the brush plate, and preventing the plastic fluid from sticking to the inner wall of the material storage port under the action of the scraping plate.

[0023] 3. By setting an outer shaft, an inner shaft, a limit block, a sealing plate, and a baffle, the present invention can automatically open the sealing plate according to the feeding pressure during the feeding process and automatically seal the upper part of the material storage port by the elastic force of the volute spring after the injection is completed, thereby preventing dust and impurities in the external environment from coming into contact with the plastic fluid stored inside after the injection is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of the present invention;

[0025] Figure 2 is a schematic diagram of the double-screw electric drive device of the present invention;

[0026] Figure 3 is a schematic diagram of the dust-proof device of the present invention;

[0027] Figure 4 is a schematic diagram of the cross-section of the baffle of the present invention;

[0028] Figure 5 is a schematic diagram of the pneumatic discharging device of the present invention;

[0029] Figure 6 is a schematic diagram of the cross-section of the fixed shaft of the present invention;

[0030] Figure 7 is a schematic diagram of the rotary pneumatic discharging device of the present invention;

[0031] Figure 8 is a schematic diagram of the cross-section of the rotating shaft of the present invention; Figure 9 Schematic diagram of the double-screw electric extrusion device of the present invention.

[0032] Among them, 1 is the main body of the injection molding machine; 2 is the pneumatic discharging device; 3 is the dust-proof device; 4 is the outer shell; 5 is the material storage port; 6 is the double-screw electric extrusion device; 7 is the rotary pneumatic discharging device; 201 is the pressure relief valve; 202 is the fixed shaft; 203 is the air nozzle; 204 is the fan; 205 is the exhaust pipe; 206 is the connecting block; 301 is the outer shaft; 302 is the inner shaft; 303 is the limit block; 304 is the sealing plate; 305 is the baffle; 601 is the connecting frame; 602 is the screw rod; 603 is the fixed rod; 604 is the guide rod; 605 is the driving wheel; 701 is the rotating shaft; 702 is the reverse pushing air nozzle; 703 is the brush plate; 704 is the air chamber; 705 is the outer bearing; 706 is the inner bearing. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1:

[0035] Please refer to the attached Figure 1 -attached Figure 3 -figures, the embodiment of the present invention provides a double-screw electric material storage mechanism for an injection molding machine, including the main body 1 of the injection molding machine, the outer shell 4, and the double-screw electric extrusion device 6. The upper part of the main body 1 of the injection molding machine is fixedly connected with the outer shell 4. The inner surface of the outer shell 4 is provided with the double-screw electric extrusion device 6. The upper end of the outer shell 4 is fixedly connected with the material storage port 5. The inside of the material storage port 5 is provided with the pneumatic discharging device 2, and the inside of the material storage port 5 is provided with the dust-proof device 3;

[0036] The pneumatic discharging device 2 includes a fan 204. The front end of the fan 204 is fixedly connected with an exhaust pipe 205. One side of the exhaust pipe 205 away from the fan 204 is fixedly connected with a pressure relief valve 201. The upper part of the pressure relief valve 201 is fixedly connected with a connecting block 206. The inner side of the connecting block 206 is fixedly connected with a fixed shaft 202. The upper end of the outer arc surface of the fixed shaft 202 is fixedly connected with an air nozzle 203.

[0037] The lower end of the material storage port 5 is connected to a double-screw electric extrusion device 6. This double-screw electric extrusion device 6 is an electric drive device of a twin-screw extruder in the prior art, so its principle will not be elaborated here. The pneumatic discharging device 2 is located below the dust-proof device 3. The outer surface of the fan 204 is fixedly connected to the material storage port 5. The air inlet of this fan 204 is connected to an inert gas storage tank. Therefore, when it is turned on, it can convey high-pressure inert gas to the exhaust pipe 205. The outer surface of the exhaust pipe 205 is fixedly connected to the connecting block 206. One end of the exhaust pipe 205 far from the fan 204 is connected to the fixed shaft 202. Therefore, it can convey the high-pressure inert gas inside it to the inside of the fixed shaft 202. The exhaust pipe 205 is fixedly connected to the air outlet of the fan 204. Through holes with the same shape as the internal exhaust pipe 205 are opened in both the connecting block 206 and the pressure relief valve 201. Therefore, it can accommodate the exhaust pipe 205 to pass through without interfering with its normal operation. The overall shape of the connecting block 206 is circular. The lower surface of the fixed shaft 202 is fixedly connected to the pressure relief valve 201. Multiple groups of through holes are opened in the upper part of the outer arc surface of the fixed shaft 202. Therefore, it can be connected to the air nozzle 203. The air nozzle 203 is integrally set to be inclined. Therefore, the gas output by it can move downward and push the plastic fluid to accelerate downward movement.

[0038] Please refer to the attached Figure 4 - attached Figure 6 The dust-proof device 3 includes a baffle 305. An inner shaft 302 is fixedly connected to the inner side of the baffle 305. An outer shaft 301 is rotatably connected to the outer arc surface of the inner shaft 302. A sealing plate 304 is fixedly connected to the outer arc surface of the outer shaft 301. A limiting block 303 is fixedly connected to the inner side of the baffle 305.

[0039] The outer arc surface of the baffle 305 is fixedly connected to the material storage port 5. A rectangular groove is opened on the inner side of the baffle 305. Therefore, it can accommodate the sealing plate 304 to move inside it. The diameter of the inner shaft 302 is smaller than that of the outer shaft 301. A through hole is opened on the inner surface of the outer shaft 301. Therefore, it can accommodate the inner shaft 302 inside it. The inner arc surface of the outer shaft 301 is elastically connected to the inner shaft 302 through a scroll spring. Therefore, through the elastic force of the scroll spring, it can drive the sealing plate 304 outside the outer shaft 301 to always fit with the limiting block 303 above it without being affected by external forces. The outer surface of the sealing plate 304 is in close contact with the baffle 305. Therefore, when the sealing plate 304 fits with the limiting block 303, it can maintain the sealing state of the upper part of the material storage port 5. The upper part of the sealing plate 304 is in contact with the limiting block 303. The overall shape of the limiting block 303 is arc-shaped. One end of the sealing plate 304 close to the material storage port 5 is set to be arc-shaped. Therefore, no movement interference will occur between the limiting block 303 and the material storage port 5 during the rotation process.

[0040] Please refer to the attached Figure 9, the double-screw electric extrusion device 6 includes a connecting frame 601. Guide rods 604 are slidably connected to both the front and rear sides of the connecting frame 601. A fixed rod 603 is fixedly connected to the inner surface of the connecting frame 601. A screw rod 602 is fixedly connected to the right side of the guide rod 604, and a driving wheel 605 is fixedly connected to the right side of the screw rod 602.

[0041] Embodiment 2:

[0042] Please refer to the appendix Figure 7 and the appendix Figure 8 , a rotary pneumatic discharging device 7 is arranged inside the material storage port 5. The rotary pneumatic discharging device 7 includes a rotary shaft 701. A reverse pushing air nozzle 702 is fixedly connected to the upper end of the outer arc surface of the rotary shaft 701. The exhaust port diameter of the reverse pushing air nozzle 702 is smaller than the diameter of the air nozzle 203. Therefore, the gas ejected by it can be pressurized under the same intake pressure. A brush plate 703 is fixedly connected to the outer arc surface of the rotary shaft 701. An inner bearing 706 is fixedly connected to the lower end of the outer arc surface of the rotary shaft 701. An outer bearing 705 is rotatably connected to the outer arc surface of the inner bearing 706. The inner bearing 706 and the outer bearing 705 are respectively the inner ring and the outer ring of a sealed bearing in the prior art. Therefore, the principle of how they rotate relative to each other will not be elaborated. The lower surface of the inner bearing 706 is rotatably connected to an air chamber 704.

[0043] Multiple groups of through holes are formed in the upper part of the outer arc surface of the rotary shaft 701, so that it can be connected to the reverse pushing air nozzle 702. The inside of the rotary shaft 701 is hollow. Through holes are formed in the lower part of the rotary shaft 701, so that it can be connected to the inner bearing 706. The lower part of the rotary shaft 701 is connected to the inner bearing 706. Through holes are formed in the inner arc surface of the inner bearing 706, so that it can be connected to the air chamber 704. And a circular protrusion is arranged at the lower part of the inner bearing 706, so that it can stably rotate inside the air chamber 704 and can ensure the airtightness inside the air chamber 704. An arc-shaped through hole is formed in the lower part of the inner bearing 706. Through holes are formed in the upper part of the air chamber 704. The outer arc surface of the air chamber 704 is connected to the exhaust pipe 205. The outer arc surface of the air chamber 704 is fixedly connected to the pressure relief valve 201. The exhaust direction of the reverse pushing air nozzle 702 is inclined downward along the tangent direction of the rotary shaft 701. Therefore, the reaction force of the ejected gas is along the tangent direction of the rotary shaft 701 and can push the rotary shaft 701 to rotate under the action of this reaction force. The brush plate 703 is integrally arranged as an inclined arc-shaped plate. Therefore, it can scrape off the plastic fluid adhering to the inner side of the material storage port 5 in the clockwise rotation state. The lower part of the outer bearing 705 is fixedly connected to the pressure relief valve 201.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-screw electric material storage mechanism for an injection molding machine, comprising an injection molding machine body (1), a housing (4), and a double-screw electric extrusion device (6), characterized in that: The upper part of the injection molding machine body (1) is fixedly connected to a housing (4), the inner surface of the housing (4) is provided with a double-screw electric extrusion device (6), the upper end of the housing (4) is fixedly connected to a material storage port (5), the interior of the material storage port (5) is provided with a pneumatic discharge device (2), and the interior of the material storage port (5) is provided with a dust blocking device (3); The pneumatic discharge device (2) comprises a fan (204), the front end of the fan (204) is fixedly connected to an exhaust pipe (205), the side of the exhaust pipe (205) away from the fan (204) is fixedly connected to a pressure relief valve (201), the upper part of the pressure relief valve (201) is fixedly connected to a connecting block (206), the inner side of the connecting block (206) is fixedly connected to a fixed shaft (202), and the upper end of the outer arc surface of the fixed shaft (202) is fixedly connected to an air nozzle (203).

2. A double-screw electric material storage mechanism for an injection molding machine according to claim 1, characterized in that: The dust blocking device (3) comprises a baffle (305), the inner side of the baffle (305) is fixedly connected to an inner shaft (302), the outer arc surface of the inner shaft (302) is rotatably connected to an outer shaft (301), the outer arc surface of the outer shaft (301) is fixedly connected to a sealing plate (304), and the inner side of the baffle (305) is fixedly connected to a limiting block (303).

3. The double-screw electric material storage mechanism for an injection molding machine according to claim 1, characterized in that: The lower end of the material storage port (5) is connected to a double-screw electric extrusion device (6), the pneumatic discharge device (2) is located below the dust shielding device (3), and the outer surface of the fan (204) is fixedly connected to the material storage port (5).

4. A double-screw electric material storage mechanism for an injection molding machine according to claim 1, characterized in that: The outer surface of the exhaust pipe (205) is fixedly connected to the connection block (206); one end of the exhaust pipe (205) away from the fan (204) is connected to the fixed shaft (202); the exhaust pipe (205) is fixedly connected to the exhaust port of the fan (204); and the connection block (206) and the pressure relief valve (201) are both provided with through holes of the same shape as the internal exhaust pipe (205).

5. The double-screw electric material storage mechanism for an injection molding machine according to claim 1, characterized in that: The connecting block (206) is in an annular shape as a whole, the lower surface of the fixed shaft (202) is fixedly connected to the pressure relief valve (201), a plurality of through holes are provided on the upper portion of the outer arc surface of the fixed shaft (202), and the air nozzle (203) is arranged in an inclined shape as a whole.

6. A double-screw electric material storage mechanism for an injection molding machine according to claim 2, characterized in that: The outer arc surface of the baffle (305) is fixedly connected to the material storage port (5), a rectangular groove is provided on the inner side of the baffle (305), the inner shaft (302) has a smaller diameter than the outer shaft (301), and a through hole is provided on the inner surface of the outer shaft (301).

7. The double-screw electric material storage mechanism for an injection molding machine according to claim 2, characterized in that: The inner arc surface of the outer shaft (301) is elastically connected to the inner shaft (302) via a spiral spring, the outer surface of the sealing plate (304) is in close contact with the baffle (305), the upper part of the sealing plate (304) is in contact with the limit block (303), the limit block (303) is arranged in an arc shape as a whole, and one end of the sealing plate (304) close to the material storage port (5) is arranged in an arc surface.

8. The double-screw electric material storage mechanism for an injection molding machine according to claim 2, characterized in that: The double-screw electric extrusion device (6) comprises a connecting frame (601), the front and rear sides of the connecting frame (601) are slidably connected to guide rods (604), the inner surface of the connecting frame (601) is fixedly connected to a fixed rod (603), the right side of the guide rod (604) is fixedly connected to a screw rod (602), and the right side of the screw rod (602) is fixedly connected to a driving wheel (605).

9. The double-screw electric material storage mechanism for an injection molding machine according to claim 1, characterized in that: A rotary pneumatic discharging device (7) is provided inside the material storage port (5), and the rotary pneumatic discharging device (7) comprises a rotating shaft (701), a reverse thrust air nozzle (702) is fixedly connected to the upper end of the outer arc surface of the rotating shaft (701), a brush plate (703) is fixedly connected to the outer arc surface of the rotating shaft (701), an inner bearing (706) is fixedly connected to the lower end of the outer arc surface of the rotating shaft (701), an outer bearing (705) is rotatably connected to the outer arc surface of the inner bearing (706), and an air bin (704) is rotatably connected to the lower surface of the inner bearing (706).

10. The double-screw electric material storage mechanism for an injection molding machine according to claim 9, characterized in that: The upper portion of the outer arc surface of the rotating shaft (701) is provided with a plurality of through holes, the interior of the rotating shaft (701) is hollow, the lower portion of the rotating shaft (701) is provided with a through hole, the lower portion of the rotating shaft (701) is connected to the inner bearing (706), the inner arc surface of the inner bearing (706) is provided with a through hole, the lower portion of the inner bearing (706) is provided with a through arc through hole, the upper portion of the gas chamber (704) is provided with a through hole, the outer arc surface of the gas chamber (704) is connected to the exhaust pipe (205), the outer arc surface of the gas chamber (704) is fixedly connected to the pressure relief valve (201), the exhaust direction of the reverse thrust air nozzle (702) is inclined downward in the tangent direction of the rotating shaft (701), the brush plate (703) is configured as an inclined arc plate as a whole, and the lower portion of the outer bearing (705) is fixedly connected to the pressure relief valve (201).

Images