Abrasive flow processing device for screw polishing and working method thereof

Abstract

The invention discloses an abrasive flow processing device for screw polishing and a working method thereof. The abrasive flow processing device comprises a constraint pipe, one end of the constraint pipe is provided with a fixed box and a screw reduction motor, and the other end of the constraint pipe is connected to a convection section pipe; a screw is assembled in the constraint pipe, a forced feeder is installed on the constraint pipe, the constraint pipe and the convection section pipe are slidably mounted on a guide rail, an electric cylinder is slidably mounted on the guide rail through a bottom plate, and the electric cylinder is connected to the convection section pipe through a piston; the device formulates corresponding constraint pipes according to screws of different sizes, thereby improving the adaptability of the device; the device on the guide rail can slide to different positions along the guide rail direction, thereby solving the problem of difficult assembly and disassembly of the device.

Description

Technical Field

[0001] The invention relates to the technical field of abrasive flow finishing processing, in particular to an abrasive flow processing device for screw polishing and a working method thereof. Background Art

[0002] Screws are core components of some mechanical equipment. Research has found that when viscoelastic materials are extruded through the spiral surface, the surface roughness of the spiral surface affects the material's sliding characteristics. When the surface roughness is less than 0.8 μm after hardening treatment, it not only improves extrusion efficiency but also increases the service life of the screw. Therefore, improving screw surface quality has become a key research topic in engineering machinery.

[0003] Currently, turning, hobbing, and milling are commonly used to process the helical surface of screws, both domestically and internationally. However, the surface quality of the processed helical surface cannot meet service requirements, so finishing becomes an essential subsequent process. An investigation found that manual polishing of the screw helical surface is significantly affected by human factors, resulting in poor polishing quality and product consistency, and low production efficiency. Using specialized CNC belt polishers and multi-axis CNC machine tools for finishing the screw surface can effectively improve processing efficiency and surface quality, but the equipment is expensive and has poor adaptability to the screw.

[0004] In the "A Screw Polishing Method" disclosed in publication number CN109318130B, the polishing screw is inserted into the inner cavity of the casing and the corresponding end of the polishing screw is connected to the corresponding rotating mechanism by the staff; the positioning device is started, and the rotating mechanism of the positioning device causes the polishing screw to rotate along the central axis of the screw, while the swinging mechanism of the positioning device causes the two ends of the polishing screw to repeatedly rise and fall in opposite directions to form an up and down swing of the polishing screw, and the moving mechanism of the positioning device causes the polishing screw to move left and right relative to the injection port of the injection mechanism; the injection mechanism is started, so that the injection mechanism sprays injection particles to polish the polishing screw on the positioning device; the polished injection particles flow to the injection particle outlet at the bottom of the casing, and flow through the pipeline to the recovery device for collection and treatment; in the above-mentioned screw polishing method, the entire screw polishing device is difficult to install and disassemble, and in order to recover the injection particles, the entire device is a sealed structure, the screw polishing condition cannot be observed, and the device cannot be discovered and repaired in time if a fault occurs; after polishing, the screw is disassembled for quality inspection. If re-polishing is required, it must be re-installed, which leads to low work efficiency. Summary of the Invention

[0005] Aiming at the problems of difficult installation and disassembly, poor adaptability and low processing efficiency during surface processing of large screws, the present invention proposes an abrasive flow processing device and method for screw polishing.

[0006] The technical solution of the present invention is as follows: an abrasive flow processing device for screw polishing, including a constraint pipe, one end of the constraint pipe is provided with a fixed box and a screw reduction motor, and the other end of the constraint pipe is connected to the convection section pipe; a screw is assembled in the constraint pipe, a forced feeder is installed on the constraint pipe, the constraint pipe and the convection section pipe are slidably installed on a guide rail, an electric cylinder is slidably installed on the guide rail through a base plate, and the electric cylinder is connected to the convection section pipe through a piston.

[0007] Preferably, a plurality of adjustable clamps are provided on the constraining pipe, and the plurality of adjustable clamps are mounted on the guide rail via linear sliders, with limit blocks being mounted on both sides of the linear sliders.

[0008] Preferably, the adjustable clamp includes a horizontal adjustment plate, a vertical adjustment plate and a connecting plate, and the connecting plate is fixed to the linear slider by screws.

[0009] Preferably, the constraint pipe and the convection section pipe are connected via a fixed connection structure, which includes a connecting flange, a connecting pipe and a contouring head, and a clamp for fixation is provided on the contouring head.

[0010] Preferably, a plurality of clamp adjustment fixtures are provided on the convection section pipe, and the plurality of clamp adjustment fixtures are mounted on the guide rail via a cross slider, and limit blocks are installed on both sides of the cross slider.

[0011] Preferably, a transfer shaft passes through the fixed box, one end of the transfer shaft is connected to the screw reduction motor through a first coupling, and the other end of the transfer shaft is connected to the screw through a second coupling.

[0012] Preferably, a seal is provided at the connection between the convection section pipeline and the piston, and a sealing ring for piston buffering movement is provided in the seal.

[0013] Preferably, the constraint pipe and the convection section pipe are provided with a plurality of temperature sensors for real-time monitoring of the pipe temperature.

[0014] Preferably, the forced feeder includes a barrel, a barrel cover, a stirring rod and an adapter plate. The barrel is connected to the constraint pipe through the adapter plate. A feeding motor for driving the stirring rod to rotate is provided on the upper end of the barrel cover; an inlet for adding abrasive is provided on the barrel cover.

[0015] A method for operating an abrasive flow machining device for screw polishing comprises the following steps:

[0016] S1. Install the screw in the constraint pipe. Install the assembled constraint pipe on the guide rail using an adjustable clamp. Connect the screw in the constraint pipe to the screw reducer motor. Ensure that the constraint pipe and the convection pipe are in a straight line and remain horizontal.

[0017] S2. Add the abrasive into the feed port of the forced feeder; start the screw reduction motor, feeding motor and electric cylinder;

[0018] S3. The feeding motor drives the stirring rod to rotate, and the stirring rod causes the abrasive to continuously enter the constraint pipe; the screw reduction motor drives the screw to rotate, driving the abrasive to move in a forward spiral. When the abrasive in the barrel has completely entered the constraint pipe, the electric cylinder drives the piston to move to the left, pushing the abrasive to flow through the screw in the forward direction. After all the abrasive has completely entered the barrel, a processing cycle is completed. The electric cylinder drives the piston to the right, pushing the abrasive to flow through the screw in the reverse direction, and the next processing cycle begins.

[0019] S4. After processing, the electric cylinder moves toward the guide rail away from the screw through the bottom plate, and the convection section pipe moves along the guide rail perpendicular to the pipe direction through the cross slider. The constraint pipe moves toward the guide rail in the direction of the electric cylinder through the linear slider to completely expose the screw and check whether the screw polishing quality is qualified.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] A screw is installed in the constraint pipe, and the screw and the constraint pipe are adapted to each other. Corresponding constraint pipes are formulated according to screws of different sizes, which improves the adaptability of the device; the constraint pipe and the convection section pipe are slidably installed on the guide rail, and an electric cylinder is slidably installed on the guide rail through the bottom plate. The device on the guide rail can slide to different positions along the direction of the guide rail, solving the problem of difficult loading and unloading of the device.

[0022] Furthermore, a plurality of adjustable clamps are provided on the constraint pipe, and the adjustable clamps meet the processing requirements of screws of different sizes and shapes, thereby improving the adaptability of the device; a plurality of adjustable clamps are installed on the guide rail through a linear slider, and the linear slider enables the adjustable clamps to slide smoothly on the guide rail so as to adjust the position of the adjustable clamps and the constraint pipe; limiters are installed on both sides of the linear slider, and the function of the limiter is to limit the sliding range of the clamp on the guide rail so that the entire device remains stable during operation.

[0023] Furthermore, the adjustable clamp fixes the constrained pipe through multiple horizontal adjustment plates and vertical adjustment plates. The horizontal adjustment plates and vertical adjustment plates can be adjusted according to the size of the constrained pipe, thereby improving the adaptability of the device; the connecting plate is fixed to the linear slider by screws, ensuring that the connection between the adjustable clamp and the linear slider is firm and stable, so that the constrained pipe can be stably installed on the linear slider when moving.

[0024] Furthermore, the profiling head is part of the fixed connection structure and is located at one end of the connecting constraint pipe. The profiling head matches the connecting end of the constraint pipe that meets the requirements of screws of different sizes and shapes. This can save costs. Only one part of the constraint pipe needs to be replaced to achieve the processing of screws of different sizes and shapes; the clamp is installed on the profiling head, making the connection structure more firm and stable, so as to ensure the safety and reliability of the pipe connection.

[0025] Furthermore, the cross slider can move the convection section pipe along the pipe length direction, and can also move the convection section pipe perpendicular to the pipe length direction, which facilitates the movement of various devices on the guide rail, completely exposes the screw, and facilitates the inspection of whether the screw polishing quality is qualified; the clamp adjustment fixture is used to fix the convection section pipe, so that the convection section pipe is more firmly installed on the guide rail; the role of the same limiter is to limit the movement range of the cross slider to ensure the stability and safety of the convection section pipe during operation.

[0026] Furthermore, the rotational motion of the screw reduction motor can be transmitted to the screw through the adapter shaft, thereby realizing the rotation of the screw; the first coupling and the second coupling can ensure the effective transmission of force and motion between the screw reduction motor and the screw.

[0027] Furthermore, the seal is a device provided at the connection between the convection section pipe and the driving piston, which is used to prevent fluid leakage and maintain the sealing of the connection; the function of the sealing ring is to provide sealing when the piston moves, and to act as a buffer and shock absorber to protect the stability and safety of the connection and the piston.

[0028] Furthermore, by arranging temperature sensors on the constraint pipe and the convection section pipe, the temperature data of the pipe can be obtained in real time. When the temperature is detected to be too high, the operation is stopped in time, thereby improving the safety of the device.

[0029] Furthermore, the barrel is connected to the constraint pipe through an adapter plate to ensure that the abrasive can flow smoothly; the feeding motor on the barrel cover provides power to drive the stirring rod to rotate, so that the abrasive continuously enters the constraint pipe. The inlet on the barrel cover is used to add abrasive to meet the needs of specific processes or applications.

[0030] In a working method of an abrasive flow processing device for screw polishing, the screw is driven to rotate by a screw reduction motor, the feeding motor drives the stirring rod to rotate so that the abrasive continuously enters the constraint pipe, and the electric cylinder drives the piston to make the abrasive re-enter the constraint pipe, causing the abrasive to reciprocate, greatly improving the processing efficiency and processing quality of the screw polishing; the two-dimensional device moving structure composed of linear sliders and cross sliders improves the problem of difficult loading and unloading of the device.

[0031] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0034] Figure 2 This is a structural cross-sectional view of the screw reduction motor, the fixing box and the restraining pipe of the present invention;

[0035] Figure 3 It is a structural sectional view of the forced feeder of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the adjustable clamp of the present invention;

[0037] Figure 5 This is a schematic diagram of the exploded structure of the fixed connection structure of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the clamp of the present invention;

[0039] Figure 7 A top view of the device being disassembled by moving the structure of the two-dimensional device after the processing of the present invention is completed;

[0040] The following are the descriptions of the reference numerals:

[0041] 1. Working platform, 2. Screw reduction motor, 3. Adapter shaft, 4. Fixed box, 4-1. Fixed box housing, 4-2. First bearing, 4-3. First coupling, 4-4. Second bearing, 4-5. Second coupling, 5. Forced feeder, 5-1. Barrel, 5-2. Barrel cover, 5-3. Bearing sleeve, 5-4. Third bearing, 5-5. Stirring rod, 5-6. Adapter plate, 5-7. Feeding port, 6. Feeding motor, 7. Linear slider, 8. Adjustable fixture, 8-1. Horizontal adjustment Section plate, 8-2, vertical adjustment plate, 8-3, connecting plate, 9, restraint pipe, 10, temperature sensor, 11, clamp, 12, fixed connection structure, 12-1, connecting flange, 12-2, connecting pipe, 12-3, contoured machine head, 13, limit block, 14, convection section pipe, 15, cross slider, 16, clamp adjustment fixture, 17, seal, 18, piston, 19, electric cylinder, 20, bottom plate, 21, leveling structure, 22, guide rail, 23, screw, 24, limit strip. DETAILED DESCRIPTION

[0042] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0043] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0044] like Figure 1 As shown, an abrasive flow processing device for screw polishing is installed on a flat working platform 1, on which a screw reduction motor 2, a fixing box 4 and a guide rail 22 are fixed by screws, and a restraining pipe 9, a convection section pipe 14 and an electric cylinder 19 are slidably installed.

[0045] Among them, a limit bar 24 is installed at the end opening of the guide rail 22. The limit bar 24 limits the movement range of each device on the guide rail 22, preventing the devices on the guide rail 22 from derailing during movement, thereby improving the safety of the entire device.

[0046] Among them, the constraint pipe 9 is fixed on the linear slider 7 through multiple adjustable clamps 8. The linear slider 7 moves left and right along the slide rail 22. After the constraint pipe 9 is installed in the fixed box 4, limit blocks 13 are installed on both sides of the linear slider 7 to prevent the constraint pipe 9 from moving during operation, thereby ensuring the stability and safety of the device during operation.

[0047] Among them, the convection tube pipe 14 is installed on the cross slider 15 through multiple clamp adjustment clamps 16. Limit blocks 13 are installed on both sides of the cross slider 15. The limit blocks 13 are used to limit the movement of the convection tube pipe 14 to ensure the stability and safety of the convection section pipe 14 during operation; the clamp adjustment clamp 16 consists of two clamps, and the convection tube pipe 14 is fixed to the cross slider 15 by bolts; the cross slider 15 can move up, down, left and right along the slide rail 22. When checking the polishing of the screw 23 later, the cross slider 15 moves along the slide rail 22 toward the track perpendicular to the direction of the pipeline, providing moving space for the constrained pipeline 9, exposing the screw 23, and facilitating quality inspection of the screw 23.

[0048] Among them, the electric cylinder 19 is installed on the base plate 20 through the leveling structure 21. The base plate 20 drives the electric cylinder 19 to slide and install on the guide rail 22. The leveling structure 21 adjusts the electric cylinder 19 to a horizontal state. The electric cylinder 19 is connected to the convection pipe 14 through the piston 18. The piston 18 reciprocates back and forth through the electric cylinder 19. A seal 17 is provided at the connection between the convection section pipe 14 and the piston 18. A sealing ring is provided in the seal 17 for the buffering activity of the piston 18, which ensures the stability and safety of the piston 18 at the connection between the convection section pipe 14 and the piston 18.

[0049] Among them, a number of temperature sensors 10 for real-time monitoring of the pipe temperature are provided on the constraint pipe 9 and the convection section pipe 14. The temperature data of the pipe can be obtained in real time. When the temperature is detected to be too high, the operation is stopped in time to improve the safety of the device.

[0050] like Figure 2 As shown, the screw reduction motor 2 is connected to the screw 23 to be polished through the adapter shaft 3. The screw reduction motor 2 and the adapter shaft 3, the adapter shaft 3 and the screw 23 are respectively connected through the first coupling 4-3 and the second coupling 4-5. A coupling is a device for connecting two shafts. It can transmit rotational force and torque, and allows a certain degree of shaft deviation and relative movement. The coupling usually consists of two parts, which are connected to the two shafts respectively. Through their connection, the shaft can transmit power and torque. Through the first coupling 4-3 and the second coupling 4-5, the rotational motion of the screw reduction motor 2 can be transmitted to the screw 23 through the adapter shaft 3, thereby realizing the rotation of the screw 23.

[0051] Among them, the adapter shaft 3 passes through the fixed box 4 and is connected to the screw reduction motor 2 and the screw 23. The function of the fixation 4 is to protect the fixed adapter shaft 3 and prevent the screw reduction motor 2 and the screw 23 from rotating at too high a speed, making the entire device unstable. The connecting shaft 3 passes through the fixed box shell 4-1, and the connection between the connecting shaft 3 and the fixed box shell 4-1 is fixed by the first bearing 4-2 and the second bearing 4-4, making the connecting shaft 3 more stable.

[0052] The screw 23 is installed in the constraint pipe 9. When different types of screws 23 need to be polished, it is only necessary to replace the constraint pipe 9 that matches the screw 23. Other structural dimensions remain unchanged, which greatly improves the applicability of this device.

[0053] like Figure 3As shown, a forced feeder 5 is installed on the end of the constraint pipe 9 close to the fixed box 4. The forced feeder 5 includes a barrel 5-1, a barrel cover 5-2, a stirring rod 5-5 and an adapter plate 5-6. The upper end of the barrel 5-1 is closed by the barrel cover 5-2 to prevent the abrasive from spraying out of the barrel 5-1; the barrel 5-1 is connected to the constraint pipe 9 through the adapter plate 5-6, and the upper end of the barrel cover 5-2 is provided with a feeding motor 6 for driving the stirring rod 5-5 to rotate; the barrel cover 5-2 is provided with a feeding port 5-7 for adding abrasive, which is convenient for the operator to add abrasive.

[0054] Among them, the feeding motor 6 that drives the stirring rod 5-5 to rotate is fixed to the barrel cover 5-2 by bolts, and the connection between the feeding motor 6 and the barrel cover 5-2 is fixed by the bearing sleeve 5-3 and the third bearing 5-4, so that the feeding motor 6 can drive the stirring rod 5-5 to rotate more stably after starting.

[0055] like Figure 4 As shown, the adjustable clamp 8 includes a horizontal adjustment plate 8-1, a vertical adjustment plate 8-2 and a connecting plate 8-3. The sizes of the horizontal adjustment plate 8-1 and the vertical adjustment plate 8-2 are adjusted according to the size of the constraint pipe 9 to be installed and fixed; the horizontal adjustment plate 8-1, the vertical adjustment plate 8-2 and the connecting plate 8-3 are fixedly connected by screws, and the connecting plate 8-3 is fixed to the linear slider 7 by screws; the screw installation connection makes the entire device more stable and safe.

[0056] like Figure 5 As shown, the fixed connection structure 12 includes a connecting flange 12-1, a connecting pipe 12-2 and a profiling head 12-3, and the profiling head 12-3 is provided with a clamp 11 for fixing; the fixed connection structure 12 is used to connect the constraint pipe 9 and the convection section pipe 14, and the profiling head 12-3 matches the connection end of the constraint pipe 9 that meets the requirements of screws 23 of different sizes and shapes, which can save costs. Only one component of the constraint pipe 9 needs to be replaced to realize the processing of screws 23 of different sizes and shapes; the clamp 11 is installed on the profiling head 12-3, making the connection structure more firm and stable, so as to ensure the safety and reliability of the pipe connection.

[0057] The connecting flange 12-1 is a common connecting element used to connect two pipes. It is usually made of metal and has certain strength and sealing properties. The design of the connecting flange 12-1 ensures the stability and sealing of the pipe connection.

[0058] like Figure 6 As shown, the hoop 11 is arc-shaped, combined with Figure 1As shown, two holding hoops 11 surround and fix the profiling machine head 12-3, and two holding hoops 11 are tightly fixed together by screws. The effect of the holding hoops 11 is to increase the stability, strength and safety of the object.

[0059] like Figure 7 As shown, after the processing is completed, the electric cylinder 19 moves backward as a whole, and the convection section pipe 14 moves to one side through the cross slider 15, the restraining pipe 9 and the forced feeder 5 and the fixed box 4 are disassembled, and the restraining pipe 9 and the forced feeder 5 move backward along the guide rail 22 to fully expose the screw 23. At this time, a distance of 300 mm is reserved between the restraining pipe 9 and the screw 23 to prevent the screw 23 from being unable to be exposed when the screw 23 is disassembled.

[0060] The adjustment structures in the present invention, such as the adjustable clamp 8 and the clamp adjustment clamp 16, have an adjustable range of 1-10 mm.

[0061] A method for operating an abrasive flow machining device for screw polishing comprises the following steps:

[0062] S1. Install the screw 23 in the constraint pipe 9. Install the assembled constraint pipe 9 on the guide rail 22 using the adjustable clamp 8. Connect the screw 23 in the constraint pipe 9 to the screw reduction motor 2. Ensure that the constraint pipe 9 and the convection pipe 14 are in a straight line and remain horizontal.

[0063] S2, add the abrasive into the feed port 5-7 of the forced feeder 5; start the screw reduction motor 2, the feeding motor 6 and the electric cylinder 19;

[0064] S3, the feeding motor 6 drives the stirring rod 5-5 to rotate, and the stirring rod 5-5 causes the abrasive to continuously enter the constraint pipe 9; the screw reduction motor 2 drives the screw 23 to rotate, driving the abrasive to move in a forward spiral direction. When the abrasive in the barrel 5-1 completely enters the constraint pipe 9, the electric cylinder 19 drives the piston 18 to move to the left, pushing the abrasive to flow through the screw 23 in a forward direction. After all the abrasive has completely entered the barrel 5-1, one processing cycle is completed. The electric cylinder 19 drives the piston 18 to the right to push the abrasive to flow through the screw 23 in the reverse direction, and the next processing cycle begins;

[0065] S4. After the processing is completed, the electric cylinder 19 moves toward the guide rail 22 away from the screw 23 through the bottom plate 20, the convection section pipe 14 moves along the guide rail 22 perpendicular to the pipe direction through the cross slider 15, and the constraint pipe 9 moves toward the guide rail 22 in the direction of the electric cylinder 19 through the linear slider 7, completely exposing the screw 23, and checking whether the polishing quality of the screw 23 is qualified.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. An abrasive flow processing device for screw polishing, characterized in that: The invention comprises a restraining pipe (9), one end of which is provided with a fixed box (4) and a screw reduction motor (2), and the other end of the restraining pipe (9) is connected to the convection section pipe (14); a screw (23) is assembled in the restraining pipe (9), a forced feeder (5) is installed on the restraining pipe (9), the restraining pipe (9) and the convection section pipe (14) are slidably mounted on a guide rail (22), an electric cylinder (19) is slidably mounted on the guide rail (22) through a bottom plate (20), and the electric cylinder (19) is connected to the convection section pipe (14) through a piston (18); a plurality of adjustable clamps (8) are provided on the restraining pipe (9), A plurality of adjustable fixtures (8) are mounted on a guide rail (22) via a linear slider (7), and a limit block (13) is mounted on both sides of the linear slider (7). The adjustable fixture (8) comprises a horizontal adjustment plate (8-1), a vertical adjustment plate (8-2) and a connecting plate (8-3), and the connecting plate (8-3) is fixed to the linear slider (7) via screws; the constraint pipe (9) and the convection section pipe (14) are connected via a fixed connection structure (12), and the fixed connection structure (12) comprises a connecting flange (12-1), a connecting pipe (12-2) and a profiling head (12-3), and the profiling head (12-3) is provided with a The convection section pipe (14) is provided with a plurality of clamp adjustment fixtures (16), which are mounted on the guide rail (22) via a cross slider (15), and a limit block (13) is mounted on both sides of the cross slider (15); a transfer shaft (3) is passed through the fixed box (4), one end of the transfer shaft (3) is connected to the screw reduction motor (2) via a first coupling (4-3), and the other end of the transfer shaft (3) is connected to the screw (23) via a second coupling (4-5); a seal (17) is provided at the connection between the convection section pipe (14) and the piston (18), A sealing ring for buffering the piston (18) is provided in the seal (17); a plurality of temperature sensors (10) for real-time monitoring of the pipe temperature are provided on the constraint pipe (9) and the convection section pipe (14); the forced feeder (5) comprises a barrel (5-1), a barrel cover (5-2), a stirring rod (5-5) and an adapter plate (5-6); the barrel (5-1) is connected to the constraint pipe (9) via the adapter plate (5-6); a feeding motor (6) for driving the stirring rod (5-5) to rotate is provided at the upper end of the barrel cover (5-2); and a feeding port (5-7) for adding abrasive is provided on the barrel cover (5-2).

2. The operating method of the abrasive flow machining device for screw polishing according to claim 1, characterized in that: The following steps are involved: S1. Install the screw (23) in the constraint pipe (9), install the assembled constraint pipe (9) on the guide rail (22) through the adjustable clamp (8), and connect the screw (23) in the constraint pipe (9) to the screw reduction motor (2); the constraint pipe (9) and the convection section pipe (14) are in a straight line and kept horizontal; S2, adding the abrasive into the feed port (5-7) of the forced feeder (5); starting the screw reduction motor (2), the feeding motor (6) and the electric cylinder (19); S3, the feeding motor (6) drives the stirring rod (5-5) to rotate, and the stirring rod (5-5) causes the abrasive to continuously enter the constraint pipe (9); the screw reduction motor (2) drives the screw (23) to rotate, driving the abrasive to move in a forward spiral direction. When the abrasive in the barrel (5-1) completely enters the constraint pipe (9), the electric cylinder (19) drives the piston (18) to move to the left, pushing the abrasive to flow through the screw (23) in a forward direction until all the abrasive has completely entered the barrel (5-1), completing one processing cycle. The electric cylinder (19) drives the piston (18) to move to the right, pushing the abrasive to flow through the screw (23) in a reverse direction, and starting the next processing cycle. S4. After the processing is completed, the electric cylinder (19) moves toward the guide rail (22) away from the screw (23) through the bottom plate (20), the convection section pipe (14) moves along the guide rail (22) perpendicular to the pipe direction through the cross slider (15), and the constraint pipe (9) moves toward the guide rail (22) in the direction of the electric cylinder (19) through the linear slider (7), so that the screw (23) is completely exposed, and the polishing quality of the screw (23) is checked to see if it is qualified.

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