Positioning injection mold for rotating body in torque sensor

Abstract

The utility model provides a positioning injection mold for a rotating body in a torque sensor. The positioning injection mold is used for solving the problems that in the prior art, product assembling precision is low, and the direction of a magnetic field cannot be rapidly judged. The mold comprises a workbench, an injection mold is fixed to the workbench, an injection cavity is formed in the injection mold in a penetrating mode, a baffle ring is arranged in the injection cavity, a radial magnetizer is arranged on one side of the injection mold, a positioning cavity is formed in the other side of the injection mold, and a ring conveying device is arranged on the side, away from the injection cavity, of the radial magnetizer. A barrel feeding device is arranged on the side, away from the injection mold, of the positioning cavity, the end of the barrel feeding device is rotationally connected with a clamp, a positioning notch is formed in one end of the shaft fixing ring, a telescopic limiting pin capable of being connected with the positioning notch in a clamped mode is arranged in the positioning cavity, and a rotating belt is arranged above the positioning cavity. According to the utility model, the telescopic limiting pin is matched with the positioning notch, so that the magnetic field position relation of the positioning notch and the magnetized magnet ring is always the same, and the direction of the magnetic field can be quickly judged through the positioning notch.

Description

Technical Field

[0001] The utility model relates to the field of torque sensor manufacturing, in particular to a positioning injection mold for a rotating body in a torque sensor. Background Art

[0002] The torque sensor measures the torque applied to the steering shaft by measuring the degree of twisting of the torsion bar. The torque sensor includes a rotating body, a stator and a collector. The collector measures the magnetization of the stator. The rotating body is usually press-fitted or glued by a magnet ring and a shaft fixing ring so that the magnet ring and the shaft fixing ring are fixed together. The assembled rotating body is placed in the stator to calibrate the magnetic field direction of the magnet ring. Manual assembly makes it difficult to ensure that each product can achieve the same assembly accuracy and quality standards, resulting in large differences between products. In the assembly process, traditional methods often rely on the worker's experience and feeling to judge the magnetic field direction of the magnet ring, which is prone to misjudgment, resulting in the wrong product calibration direction, resulting in product scrapping. In addition, the manual assembly method requires a lot of manpower and the assembly speed is slow, which cannot meet the modern manufacturing industry's demand for high efficiency. Utility Model Content

[0003] The utility model provides a positioning injection mold for a rotating body in a torque sensor, which solves the problems of low product assembly accuracy and inability to quickly determine the direction of a magnetic field in the prior art.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A positioning injection mold for a rotating body in a torque sensor comprises a workbench, on which an injection mold is fixed, an injection cavity is penetrated by the injection mold, a retaining ring is arranged in the injection cavity, a radial magnetizer is arranged on one side of the injection mold, a positioning cavity is arranged on the other side of the injection mold, a ring sending device is arranged on the side of the radial magnetizer away from the injection cavity, the ring sending device drives the magnet ring to pass through the radial magnetizer and the injection cavity in sequence through a push plate, a tube sending device is arranged on the side of the positioning cavity away from the injection mold, a clamp is rotatably connected to the end of the tube sending device, the clamp drives the shaft fixing ring to pass through the positioning cavity, the injection cavity and the retaining ring in sequence, a positioning notch is arranged at one end of the shaft fixing ring, a telescopic limit pin which can be engaged with the positioning notch is arranged in the positioning cavity, a rotating belt is arranged above the positioning cavity, the rotating belt is connected with a lifting device, the rotating belt makes the shaft fixing ring rotate in the positioning cavity by friction with the side wall of the shaft fixing ring, and the injection cavity, the push plate, the shaft fixing ring and the retaining ring form a sealed injection molding area.

[0006] Furthermore, the feeding tube device includes a feeding tube telescopic rod, a receiving groove is provided between the feeding tube telescopic rod and the positioning cavity, a square tube is connected above the receiving groove, and the square tube allows the shaft fixing ring to be placed in the receiving groove in sequence. When the shaft fixing ring is placed in the receiving groove, the axis of the feeding tube telescopic rod, the receiving groove, the shaft fixing ring, the retaining ring and the injection cavity coincide, and the diameter of the small end of the feeding tube telescopic rod is the same as that of the shaft fixing ring. Multiple shaft fixing rings can be pre-placed through the square tube to achieve continuous feeding, which greatly improves production efficiency, reduces waiting time, and enables the equipment to operate continuously and stably.

[0007] Furthermore, the ring delivery device includes a magnetized telescopic rod, a push plate is fixed at the end of the magnetized telescopic rod, a U-shaped support frame is provided between the magnetized telescopic rod and the ring delivery device, the bottom end of the support frame is a circular arc groove, the inner diameter of the circular arc groove, the inner diameter of the radial magnetizer and the diameter of the injection cavity are all the same as the outer diameter of the magnet ring, the push plate enables the magnet ring to pass through the support frame, the radial magnetizer and the injection cavity in sequence, and the magnet ring can be against the retaining ring. Through the cooperation of the support frame, the radial magnetizer and the injection cavity, the magnet ring can be accurately positioned during the movement to avoid deviation, reduce the waiting time of the magnet ring during the magnetization and injection molding process, and improve production efficiency.

[0008] Furthermore, the positioning cavity includes two side plates, the distance between the side plates is the same as the outer diameter of the shaft fixing sleeve, the telescopic limit pin is fixedly arranged on the workbench between the side edges, the telescopic limit pin includes a lifting telescopic rod, the top of the lifting telescopic rod is provided with a connecting plate, the connecting plate is provided with a guide column, the guide column is provided with a sliding limit pin, and the guide column is provided with a spring. Through the cooperation of the lifting telescopic rod and the telescopic limit pin, the positioning of the shaft fixing sleeve is realized, the consistency of the position of each shaft fixing sleeve is ensured, and the quality and consistency of the final product are improved.

[0009] Furthermore, the lifting device includes a gear and a lifting plate rotatably connected to the outside of the side plate, a slide groove is provided on the side plate, the lifting plate moves up and down along the slide groove, the lifting plate is meshed with the gear through a driven rack, the top of the lifting plate can be against the rotating belt, the connecting plate is connected with a driving rack through a sliding plate, the driving rack is meshed with the side of the gear away from the driven rack, and the sliding plate passes through the side plate. The lifting plate moves up and down along the slide groove, which saves space, and the structure of the transmission parts such as the gear and the rack is relatively simple, and easy to replace and maintain.

[0010] Furthermore, the shaft fixing ring is provided with a clamping groove in the circumferential direction, the clamping groove corresponds to the magnet ring, and the width of the clamping groove is greater than the thickness of the magnet ring, and the end of the retaining ring close to the radial magnetizer is provided with an injection molding groove. Through the injection molding connection, a stable connection is formed between the shaft fixing ring, the magnet ring and the retaining ring, and the impact of the external environment can be resisted, thereby enhancing the durability and reliability of the entire assembly.

[0011] Furthermore, the cross section of the positioning notch on the shaft fixing ring is V-shaped, the width of the positioning notch gradually decreases from the outer wall to the inner wall of the shaft fixing ring, and the top side wall of the stop pin matches the positioning notch. The V-shaped positioning notch enables the stop pin to match the positioning notch more accurately, reduces the gap error, and improves the positioning accuracy.

[0012] The beneficial effects that this technical solution can produce.

[0013] The utility model ensures that the positioning notch on the shaft fixing ring is always in the same position as the magnetic field position of the magnet ring after magnetization through the cooperation of the telescopic limit pin and the positioning notch, which not only improves the assembly accuracy of the product, but also enables the staff to quickly determine the direction of the magnetic field through the position of the positioning notch, which is convenient for the assembly and positioning of subsequent products. The automatic conveying and positioning of the magnet ring and the shaft fixing ring are realized through the cooperation of the ring feeding device, the barrel feeding device and the lifting device, which greatly improves the production efficiency. The injection molding process is used to connect the shaft fixing ring, the magnet ring and the retaining ring, which greatly simplifies the traditional assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the utility model;

[0017] Figure 3 It is a three-dimensional structural schematic diagram of the tube feeding device of the utility model;

[0018] Figure 4 It is a schematic diagram of the cross-sectional three-dimensional structure of the injection mold of the utility model when performing injection molding;

[0019] Figure 5 for Figure 2 A local enlarged schematic diagram of the middle A;

[0020] Figure 6 for Figure 3 A local enlarged schematic diagram of point B in the middle.

[0021] Wherein: 1. workbench, 2. injection mold, 3. injection cavity, 4. retaining ring, 5. radial magnetizer, 6. positioning cavity, 7. ring feeding device, 8. push plate, 9. magnet ring, 10. tube feeding device, 11. clamp, 12. shaft fixing ring, 13. positioning notch, 14. telescopic limit pin, 15. rotating belt, 16. tube feeding telescopic rod, 17. receiving groove, 18. square tube, 19. magnetized telescopic rod, 20. support frame, 21. side plate, 22. lifting telescopic rod, 23. guide column, 24. limit pin, 25. slide groove, 26. gear, 27. lifting plate, 28. driven rack, 29. driving rack, 30. sliding plate, 31. clamping groove, 32. injection groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-2As shown in , 4, the embodiment of the utility model provides a positioning injection mold for a rotating body in a torque sensor, including a workbench 1, an injection mold 2 is fixed on the workbench 1, an injection cavity 3 is penetrated in the injection mold 2, a retaining ring 4 is provided in the injection cavity 3, a radial magnetizer 5 is provided on one side of the injection mold 2, a positioning cavity 6 is provided on the other side of the injection mold 2, a ring sending device 7 is provided on the side of the radial magnetizer 5 away from the injection cavity 3, the ring sending device 7 drives a magnet ring 9 to pass through the radial magnetizer 5 and the injection cavity 3 in sequence through a push plate 8, and a barrel sending device is provided on the side of the positioning cavity 6 away from the injection mold 2 10, the end of the barrel feeding device 10 is rotatably connected with a clamp 11, and the clamp 11 drives the shaft fixing ring 12 to pass through the positioning cavity 6, the injection cavity 3 and the retaining ring 4 in sequence. A positioning notch 13 is provided at one end of the shaft fixing ring 12, and a telescopic stop pin 14 that can be engaged with the positioning notch 13 is provided in the positioning cavity 6. A rotating belt 15 is provided above the positioning cavity 6, and the rotating belt 15 is connected with a lifting device. The rotating belt 15 makes the shaft fixing ring 12 rotate in the positioning cavity 6 by friction with the side wall of the shaft fixing ring 12, and the injection cavity 3, the push plate 8, the shaft fixing ring 12 and the retaining ring 4 form a sealed injection molding area. The radial magnetizer 5 is a prior art, and the injection holes or materials used in the injection mold 2 are all prior art, so the injection mold 2 and the radial magnetizer 5 are not described in detail. The clamp 11 is a pneumatic or hydraulic three-jaw chuck, which can be used to easily locate the center of the shaft fixing ring 12, and the pneumatic or hydraulic type can respond quickly, thereby improving the efficiency of fixing the shaft fixing ring 12. The rotating belt 15 can be an existing belt transmission device, which provides sufficient friction force for the shaft fixing ring 12 through the reciprocating rotation of the belt.

[0024] During use, the magnet ring 9 is brought into the radial magnetizer 5 by the ring feeding device 7 for magnetization. After the magnetization is completed, the ring feeding device 7 drives the magnet ring 9 into the injection cavity 3 through the push plate 8, and makes the magnetized magnet ring 9 slide along the injection cavity 3 to the baffle. At the same time, the tube feeding device 10 drives the shaft fixing ring 12 into the positioning cavity 6 through the clamp 11, and the lifting device makes the rotating belt 15 descend, and makes the rotating belt 15 and the telescopic limit rod abut against the side wall of the shaft fixing ring 12. When the rotating belt 15 rotates, the rotating belt 15 will cause the shaft fixing ring 12 to rotate through the friction force with the side wall of the shaft fixing ring 12, and the shaft fixing ring 12 will drive the clamp 11 to rotate. When the rotation of the fixing ring 12 makes the positioning notch 13 correspond to the telescopic limiting rod, the telescopic limiting rod will be placed in the positioning notch 13 of the shaft fixing ring 12 and limit the rotation of the shaft fixing ring 12. At this time, the lifting device drives the rotating belt 15 away from the shaft fixing ring 12, and the feeding tube device 10 drives the shaft fixing ring 12 into the magnet ring 9 in the injection cavity 3. The injection cavity 3, the push plate 8, the shaft fixing ring 12 and the retaining ring 4 form a sealed injection area, and then the injection mold 2 is used for injection molding, so that the shaft fixing ring 12 and the magnet ring 9 are completely fixedly connected. After the injection molding is completed, the feeding tube device 10 pushes the molded product out of the injection cavity 3, so that the staff can easily take it out. Through the cooperation of the telescopic limiting pin 14 and the positioning notch 13, the magnetic field position relationship between the positioning notch 13 on the shaft fixing ring 12 and the magnetized magnet ring 9 is always the same, and the staff judges the direction of the magnetic field by the position of the positioning notch 13, which is convenient for the assembly and positioning of subsequent products.

[0025] like Figure 1-3As shown, the feeding tube device 10 includes a feeding tube telescopic rod 16, and a feeding device is provided between the feeding tube telescopic rod 16 and the positioning cavity 6. The feeding device includes a receiving groove 17, and a square tube 18 is connected above the receiving groove 17. The square tube 18 allows the shaft fixing ring 12 to be placed in the receiving groove 17 in sequence. When the shaft fixing ring 12 is placed in the receiving groove 17, the axes of the feeding tube telescopic rod 16, the receiving groove 17, the shaft fixing ring 12, the retaining ring 4 and the injection cavity 3 coincide, and the small end diameter of the feeding tube telescopic rod 16 is the same as that of the shaft fixing ring 12. In order to realize continuous feeding of the feeding tube device 10, multiple shaft fixing rings 12 are sequentially placed in the square tube 18. The first shaft fixing ring 12 will pass through the square tube 18 and be placed in the receiving groove 17. The feeding tube telescopic rod 16 fixes the shaft fixing ring 12 through the clamp 11. The shaft fixing ring 12 passes through the receiving groove 17 and is placed in the positioning cavity 6 through the extension and contraction of the feeding tube telescopic rod 16. When the feeding tube telescopic rod 16 is pushed out of the receiving groove 17, the side wall of the feeding tube telescopic rod 16 replaces the first shaft fixing ring 12 to support the remaining shaft fixing rings 12. When the first shaft fixing ring 12 is completed by injection molding and assembly, the feeding tube telescopic rod 16 shrinks and moves out of the receiving groove 17. At this time, the second shaft fixing ring 12 enters the receiving groove 17 under the action of gravity. Continuous feeding can be realized without an additional power source, which simplifies the equipment structure. The feeding tube telescopic rod 16 returns to its original position and waits for the next injection molding and assembly work, ensuring the stability and continuity of the feeding process. The axes of the feeding tube telescopic rod 16, the receiving groove 17, the shaft fixing ring 12, the retaining ring 4 and the injection cavity 3 coincide with each other, ensuring that the shaft fixing ring 12 can accurately enter the positioning cavity 6 and the injection cavity 3, avoiding assembly problems caused by position offset.

[0026] like Figure 1-2As shown, the ring delivery device 7 includes a magnetized telescopic rod 19, a push plate 8 is fixed at the end of the magnetized telescopic rod 19, a U-shaped support frame 20 is provided between the magnetized telescopic rod 19 and the ring delivery device 7, the bottom end of the support frame 20 is a circular arc groove, the inner diameter of the circular arc groove, the inner diameter of the radial magnetizer 5 and the diameter of the injection cavity 3 are all the same as the outer diameter of the magnet ring 9, the push plate 8 makes the magnet ring 9 pass through the support frame 20, the radial magnetizer 5 and the injection cavity 3 in sequence, and the magnet ring 9 can be against the retaining ring 4. The barrel delivery telescopic rod 16 and the magnetized telescopic rod 19 are both existing telescopic devices such as electric push rods or hydraulic rods. During use, the magnet ring 9 is placed in the support frame 20, and the magnetizing telescopic rod 19 pushes the magnet ring 9 to be placed in the radial magnetizer 5 through the push plate 8. The radial magnetizer 5 magnetizes the magnet ring 9. After the magnetization is completed, the magnetizing telescopic rod 19 allows the magnet ring 9 to enter the injection cavity 3 through the push plate 8. The distance between the support frame 20, the radial magnetizer 5 and the injection cavity 3 is less than the thickness of the magnet ring 9, and the inner diameter of the arc groove, the inner diameter of the radial magnetizer 5 and the diameter of the injection cavity 3 are all the same as the outer diameter of the magnet ring 9, so that the magnet ring 9 can enter each component one by one for magnetization and assembly, and move smoothly between the components to prevent the magnet ring 9 from falling off during movement. After magnetization, the injection molding is directly performed and the magnet ring is fixed with the shaft fixing ring 12, which reduces the positioning error during transportation and reassembly after magnetization. The inner diameter of the arc groove is the same as the outer diameter of the magnet ring 9, which provides stable support for the magnet ring 9.

[0027] like Figure 3 , 5As shown, the positioning cavity 6 includes two side plates 21, the distance between the side plates 21 is the same as the outer diameter of the shaft fixing sleeve, the telescopic limit pin 14 is fixedly arranged on the workbench 1 between the side edges, and the telescopic limit pin 14 includes a lifting telescopic rod 22, the top of the lifting telescopic rod 22 is provided with a connecting plate, and the connecting plate is provided with a guide column 23, and the limit pin 24 is slidably arranged on the guide column 23, and a spring is sleeved on the guide column 23. Through the cooperation of the two side plates 21, the shaft fixing sleeve can quickly enter the positioning cavity 6 and be accurately limited, so as to prevent the shaft fixing ring 12 from being unable to be assembled due to the tilting. When the shaft fixing sleeve is placed in the positioning cavity 6, the lifting telescopic rod 22 drives the limit pin 24 to move upward through the connecting plate, so that the limit pin 24 abuts against the side wall of the shaft fixing sleeve, and the limit pin 24 compresses the spring. The compression spring can abut against the connecting plate through the pressure sensing switch. When the spring is compressed, the pressure sensing switch is activated. When the limit pin 24 is placed in the positioning notch 13, the pressure value detected by the pressure sensing switch decreases. At the same time, the pressure sensing switch transmits an electrical signal to the feeding tube telescopic rod 16, so that the feeding tube telescopic rod 16 pushes the shaft fixing ring 12 into the retaining ring 4. The pressure sensing switch is a prior art. When the shaft fixing sleeve is placed in the positioning cavity 6, the positioning notch 13 of the shaft fixing sleeve can be fixed in a predetermined position by telescoping the limit pin 14, which reduces the complexity and error rate of manual operation. The setting of the guide column 23 provides a clear guiding effect for the limit pin 24, ensuring the stability and accuracy of the limit pin 24 during the movement.

[0028] like Figure 3 , 6As shown, the lifting device includes a gear 26 and a lifting plate 27 rotatably connected to the outside of the side plate 21. A slide groove 25 is provided on the side plate 21. The lifting plate 27 moves up and down along the slide groove 25. The lifting plate 27 is meshed with the gear 26 through a driven rack 28. The top of the lifting plate 27 can be against the rotating belt 15. The connecting plate is connected to a driving rack 29 through a sliding plate 30. The driving rack 29 is meshed with the side of the gear 26 away from the driven rack 28. The sliding plate 30 passes through the side plate 21. During use, since the driving rack 29 and the driven rack 28 are respectively arranged on both sides of the gear 26, the moving directions of the driving rack 29 and the driven rack 28 are opposite. When the lifting and telescopic rod 22 drives the connecting plate to move downward, the driving rack 29 drives the driven rack 28 to move upward through the gear 26, and the driven rack 28 causes the lifting plate 27 to move upward along the slide groove 25, and causes the top of the lifting plate 27 to abut against the rotating belt 15. The continuous rise of the lifting plate 27 causes the bottom surface of the rotating belt 15 to form an upward depression, which facilitates the sending tube telescopic rod 16 to push the shaft fixing ring 12 into the positioning cavity 6. When the shaft fixing ring 12 needs to be positioned, the connecting plate drives the driving rack 29 to move upward, and the gear 26 drives the lifting plate 27 to move downward along the slide groove 25 through the driven rack 28, so that the lifting plate 27 is away from the rotating belt 15. Under the action of gravity and the force of its own recovery, the rotating belt 15 can abut against the side wall of the shaft fixing ring 12. The lifting and lowering of the limit pin 24 and the lifting plate 27 can be controlled simultaneously by a lifting telescopic rod 22, which reduces the driving equipment, reduces the complexity of the structure, and reduces the equipment cost. The meshing connection between the gear 26 and the rack makes the movement of the lifting plate 27 fast and accurate, reduces the adjustment time, and improves the production efficiency.

[0029] like Figure 3 , 4 As shown, the shaft fixing ring 12 is provided with a clamping groove 31 in the circumferential direction, the clamping groove 31 corresponds to the magnet ring 9, and the width of the clamping groove 31 is greater than the thickness of the magnet ring 9, and the end of the retaining ring 4 close to the radial magnetizer 5 is provided with an injection groove 32. By providing the clamping groove 31 in the circumferential direction of the shaft fixing ring 12 and corresponding to the magnet ring 9, the injection molded substrate can be directly clamped with the shaft fixing ring 12 and the clamping groove 31, thereby improving the connection stability between the shaft fixing ring 12 and the magnet ring 9. The width of the clamping groove 31 is greater than the thickness of the magnet ring 9, so that there is a certain fault tolerance space during the injection molding process, which is convenient for the injection molding material to fully fill the clamping groove 31 and form a tighter connection. When the injection molding material fills the injection molding groove 32, a layer of retaining ring 4 will be formed on the end face of the magnet ring 9. The retaining ring 4 not only increases the overall structural strength, but also can effectively prevent the magnet ring 9 from sliding along the axial direction of the shaft fixing ring 12, thereby ensuring the stability and reliability of the assembly.

[0030] like Figure 3 , 4As shown, the cross section of the positioning notch 13 on the shaft fixing ring 12 is V-shaped, and the width of the positioning notch 13 gradually decreases from the outer side wall to the inner side wall of the shaft fixing ring 12, and the top side wall of the stop pin 24 matches the positioning notch 13. The V-shaped positioning notch 13 enables the stop pin 24 to be accurately guided along the gradually decreasing width when inserted, reducing the gap error and improving the positioning accuracy. Once the stop pin 24 is inserted into the positioning notch 13, it can form a stable connection with the shaft fixing ring 12, and this connection is not easy to loosen or shift due to external factors, thereby enhancing the stability of the overall structure.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A positioning injection mold for a rotating body in a torque sensor, comprising a workbench (1), characterized in that: An injection mold (2) is fixed on a workbench (1), an injection cavity (3) is provided in the injection mold (2), a retaining ring (4) is provided in the injection cavity (3), a radial magnetizer (5) is provided on one side of the injection mold (2), a positioning cavity (6) is provided on the other side of the injection mold (2), a ring delivery device (7) is provided on the side of the radial magnetizer (5) away from the injection cavity (3), the ring delivery device (7) drives a magnet ring (9) to pass through the radial magnetizer (5) and the injection cavity (3) in sequence through a push plate (8), a barrel delivery device (10) is provided on the side of the positioning cavity (6) away from the injection mold (2), and the end of the barrel delivery device (10) is rotatably connected to a clamp (1 1), a clamp (11) drives a shaft fixing ring (12) to pass through a positioning cavity (6), an injection cavity (3) and a retaining ring (4) in sequence, a positioning notch (13) is provided at one end of the shaft fixing ring (12), a telescopic stop pin (14) which can be engaged with the positioning notch (13) is provided in the positioning cavity (6), a rotating belt (15) is provided above the positioning cavity (6), the rotating belt (15) is connected to a lifting device, the rotating belt (15) causes the shaft fixing ring (12) to rotate in the positioning cavity (6) by friction with the side wall of the shaft fixing ring (12), and the injection cavity (3), the push plate (8), the shaft fixing ring (12) and the retaining ring (4) form a sealed injection molding area.

2. The positioning injection mold for a rotating body in a torque sensor according to claim 1, characterized in that: The barrel delivery device (10) comprises a barrel delivery telescopic rod (16), a receiving groove (17) is provided between the barrel delivery telescopic rod (16) and the positioning cavity (6), a square barrel (18) is connected above the receiving groove (17), and the square barrel (18) enables the shaft fixing ring (12) to be sequentially placed in the receiving groove (17). When the shaft fixing ring (12) is placed in the receiving groove (17), the axes of the barrel delivery telescopic rod (16), the receiving groove (17), the shaft fixing ring (12), the retaining ring (4) and the injection cavity (3) coincide, and the small end diameter of the barrel delivery telescopic rod (16) is the same as that of the shaft fixing ring (12).

3. The positioning injection mold for a rotating body in a torque sensor according to claim 1, characterized in that: The ring delivery device (7) comprises a magnetized telescopic rod (19), a push plate (8) is fixed at the end of the magnetized telescopic rod (19), a U-shaped support frame (20) is provided between the magnetized telescopic rod (19) and the ring delivery device (7), the bottom end of the support frame (20) is a circular arc groove, the push plate (8) enables the magnet ring (9) to pass through the support frame (20), the radial magnetizer (5) and the injection cavity (3) in sequence, and the magnet ring (9) can abut against the retaining ring (4).

4. The positioning injection mold for a rotating body in a torque sensor according to claim 1, characterized in that: The positioning cavity (6) comprises two side plates (21), the distance between the side plates (21) is the same as the outer diameter of the shaft fixing sleeve, the telescopic limit pin (14) is fixedly arranged on the workbench (1) between the side edges, the telescopic limit pin (14) comprises a lifting telescopic rod (22), a connecting plate is arranged at the top end of the lifting telescopic rod (22), a guide column (23) is arranged on the connecting plate, a limit pin (24) is slidably arranged on the guide column (23), and a spring is sleeved on the guide column (23).

5. The positioning injection mold for a rotating body in a torque sensor according to claim 4, characterized in that: The lifting device comprises a gear (26) and a lifting plate (27) rotatably connected to the outside of the side plate (21); a slide groove (25) is provided on the side plate (21); the lifting plate (27) moves up and down along the slide groove (25); the lifting plate (27) is meshed and connected with the gear (26) through a driven rack (28); the top end of the lifting plate (27) can abut against the rotating belt (15); the connecting plate is connected with a driving rack (29) through a sliding plate (30); the driving rack (29) is meshed with a side of the gear (26) away from the driven rack (28); and the sliding plate (30) passes through the side plate (21).

6. The positioning injection mold for a rotating body in a torque sensor according to claim 1, characterized in that: The shaft fixing ring (12) is provided with a clamping groove (31) in the circumferential direction, the clamping groove (31) corresponds to the magnet ring (9), and the width of the clamping groove (31) is greater than the thickness of the magnet ring (9). The retaining ring (4) is provided with an injection molding groove (32) at one end close to the radial magnetizer (5).

7. The positioning injection mold for a rotating body in a torque sensor according to claim 1, characterized in that: The cross section of the positioning notch (13) is V-shaped, and the width of the positioning notch (13) gradually decreases from the outer wall to the inner wall of the shaft fixing ring (12), and the top side wall of the limiting pin (24) matches the positioning notch (13).

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