Quick self-locking type rotating shaft clamp for hollow shaft angular displacement potentiometer

Abstract

The rapid self-locking type rotating shaft clamp comprises a clamping shaft, elastic assemblies, a clamping plate and clamping pins, the clamping shaft is provided with a clamping ring, the clamping ring is provided with a plurality of elastic assemblies, the elastic assemblies comprise the elastic pins, and the elastic pins are arranged on the clamping plate. A small-diameter section is arranged at one end of the clamping shaft, an annular step is formed at the outer diameter changing position, a pin hole is formed in the small-diameter section, the clamping pin penetrates through the pin hole, a center through hole is formed in the clamping plate, U-shaped grooves are formed in the two opposite sides of the circumferential hole wall of the center through hole respectively, and a positioning groove is formed in the surface of one side of the clamping plate. The small-diameter section is sleeved with the clamping plate which is located between the annular step and the clamping pin. According to the utility model, the function of quickly assembling and disassembling the hollow rotating shaft is realized, the operation is simple and quick, the assembling and disassembling efficiency is improved, the clamping plate does not contact with the corresponding end surface of the hollow rotating shaft when rotating, the corresponding end surface of the hollow rotating shaft is prevented from being scratched, and the qualification rate of potentiometers is improved.

Description

Technical Field

[0001] The utility model relates to a rotating shaft clamp for an angular displacement potentiometer, in particular to a fast self-locking rotating shaft clamp for a hollow shaft angular displacement potentiometer. Background Art

[0002] With the miniaturization and informatization of products, electric servo mechanisms occupy a major position in more and more servo control systems, and the angular displacement potentiometers for position feedback used in conjunction with them are also widely used. The angular displacement potentiometers with hollow shafts are collectively referred to as hollow shaft angular displacement potentiometers.

[0003] like Figure 1 As shown, the basic structure of the hollow shaft angular displacement potentiometer includes a housing 2, a hollow shaft 6, an insulating sleeve 7, a collector ring 4, a brush 3, a resistor 5 and a cover plate 1. The hollow shaft 6 passes through the corresponding through hole on the housing 2 and is connected to the housing 2 through a bearing 8. Two bearings 8 are centrally mounted in parallel on the hollow shaft 9 near one end, which can reduce the volume of the potentiometer and save installation space. The resistor 5 generally adopts a conductive plastic resistor and is installed in the housing 2. The insulating sleeve 7 is sleeved on the hollow shaft 6, the collector ring 4 is sleeved on the insulating sleeve 7, the brush 3 is mounted on the collector ring 4 and contacts the resistor band of the resistor 5, and the inner end of the lead wire 9 is connected to the resistor 5. When in use, the hollow shaft 6 drives the brush 3 to contact and slide on the resistor band of the resistor 5, generating a changing electrical signal, which has a corresponding relationship with the rotation angle of the hollow shaft 6, thereby realizing the angular displacement detection function or the function of controlling the size of the output electrical signal through the angular displacement change.

[0004] The above hollow shaft angular displacement potentiometer needs to be tested for accuracy, life and other tests before leaving the factory. Before starting the test, the hollow shaft 6 of the above hollow shaft angular displacement potentiometer needs to be clamped by a shaft fixture to facilitate connection with other rotating drive components. Traditional shaft fixtures such as Figure 2 As shown, it includes a central shaft 11 and a nut 12. One end of the central shaft 11 is provided with a convex ring 10 with a larger outer diameter, and the other end of the central shaft 11 is provided with a threaded section 13 with a smaller outer diameter, and the nut 12 is sleeved outside the threaded section 13. When in use, the central shaft 11 passes through the central through hole of the hollow shaft 6 of the hollow shaft angular displacement potentiometer, the convex ring 10 contacts the outer wall of one end of the hollow shaft 6, and the nut 12 is tightened. The nut 12 is in close contact with the outer wall of the other end of the hollow shaft 6, and the hollow shaft 6 is clamped by the clamping force between the convex ring 10 and the nut 12 to achieve the synchronous rotation function.

[0005] The above-mentioned traditional shaft clamp has the following defects: each clamping operation requires the installation and locking of the nut 12, and each disassembly requires the loosening and removal of the nut 12. The assembly and disassembly process is time-consuming and labor-intensive, and the efficiency is low. In addition, the nut 12 may cause scratches and other damage to the corresponding end face of the hollow shaft 6 during the tightening process, which may cause the potentiometer to fail in severe cases. In addition, there is no anti-rotation structure between the nut 12 and the corresponding end face of the hollow shaft 6, which may cause looseness and reduce the clamping reliability. Utility Model Content

[0006] The purpose of the utility model is to provide a quick self-locking shaft clamp for a hollow shaft angular displacement potentiometer, which is simple and quick to operate and will not cause damage to the hollow shaft, in order to solve the above problems.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0008] A fast self-locking rotating shaft clamp for a hollow shaft angular displacement potentiometer, comprising a clamping shaft, an elastic component, a clamping plate and a clamping pin, wherein a clamping ring protruding toward the circumferential direction and integrally formed is provided on the circumferential outer wall of the clamping shaft near the first end of the two ends, a plurality of the elastic components are evenly mounted on the clamping ring along the circumferential direction, the elastic component comprises an elastic pin and the elastic pin has an elastic force in the direction of the second end of the two ends of the clamping shaft, a section of the outer diameter of the clamping shaft near the second end is reduced to form a small diameter section and an annular step is formed at the location where the outer diameter changes, the small diameter section is formed at the small diameter section, and the small diameter section is formed at the location where the outer diameter changes. The small diameter section is provided with a pin hole, the axial direction of the pin hole is perpendicular to the axial direction of the clamping shaft, the clamping pin passes through the pin hole and both ends of the clamping pin extend out of the small diameter section, the clamping plate is provided with a central through hole and the circumferential hole walls of the central through hole are respectively provided with "U"-shaped grooves on opposite sides for the clamping pin to pass through, a positioning groove is provided on one side surface of the clamping plate and the center line of the positioning groove passes through the center point of the central through hole of the clamping plate, the clamping plate is sleeved outside the small diameter section through its own central through hole and is located between the annular step and the clamping pin.

[0009] Preferably, in order to facilitate the installation of the elastic component and to facilitate the function of making the elastic pin have an elastic force in the direction close to the second end of the clamping shaft, the clamping ring is evenly provided with a plurality of through mounting screw holes along the circumferential direction, and the elastic component also includes a sleeve and a compression spring. The circumferential outer wall of the sleeve is provided with an external thread and is installed in the corresponding mounting screw hole through the external thread. The inner ends of the compression spring and the elastic pin are both placed in the sleeve, and the two ends of the compression spring are located between the inner end of the elastic pin and the inner wall of the sleeve at one end away from the elastic pin, and the outer end of the elastic pin is located outside the sleeve.

[0010] Preferably, in order to facilitate processing and assembly, the elastic component also includes a cover plate, the end of the sleeve corresponding to the elastic pin is open and the cover plate is installed on the end, the cover plate is provided with a central through hole and the elastic pin passes through the central through hole, and the outer diameter of the inner end of the elastic pin is enlarged and cannot pass through the central through hole of the cover plate.

[0011] Preferably, in order to facilitate the operation of the clamping ring by hand, the outer peripheral surface of the clamping ring is provided with two mutually parallel planes.

[0012] Preferably, in order to facilitate installation of the sleeve by a hexagonal wrench, an inner hexagonal countersunk hole is provided on an end surface of the sleeve away from the elastic pin.

[0013] Preferably, in order to realize the positioning and clamping function by rotating 90° as a habit, the length direction of the positioning groove is perpendicular to the line connecting the two "U"-shaped grooves.

[0014] Preferably, in order to facilitate the operation of the clamping plate by hand, the outer peripheral surface of the clamping plate is provided with two mutually parallel planes.

[0015] Preferably, in order to facilitate the rapid fixed connection between the clamping pin and the clamping shaft, the clamping pin and the hole wall of the pin hole are connected by an adhesive.

[0016] Preferably, in order to achieve uniform and reliable clamping of the rotating shaft of the potentiometer, the number of the elastic components is four.

[0017] The beneficial effects of the utility model are:

[0018] The utility model is designed with a clamping shaft, an elastic component, a clamping plate and a clamping pin that are connected to each other. When in use, the clamping shaft only needs to be passed through the central through hole of the hollow shaft of the hollow shaft angular displacement potentiometer, the elastic component is pressed to press one end of the hollow shaft, the clamping plate is sleeved on the outside of the small diameter section of the clamping shaft through its own central through hole and the "U"-shaped groove, and then the clamping plate is rotated until the clamping pin corresponds to the positioning groove and the elastic component is released. Under the action of the elastic pin, the clamping pin is placed in the positioning groove to achieve an anti-rotation function. At this time, the elastic component and the clamping plate clamp the two ends of the hollow shaft to achieve a quick clamping function for the hollow shaft. When disassembling, the disassembly can be quickly completed by reverse operation, and finally the quick assembly and disassembly function of the hollow shaft is achieved. The operation is simple and quick, and the assembly and disassembly efficiency is improved. Moreover, when the clamping plate rotates, it can avoid contacting the corresponding end face of the hollow shaft, thereby avoiding scratches on the corresponding end face of the hollow shaft and improving the qualified rate of the potentiometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the main sectional view of the hollow shaft angular displacement potentiometer;

[0020] Figure 2 This is the front view of the hollow shaft of the hollow shaft angular displacement potentiometer after being clamped by a traditional shaft fixture;

[0021] Figure 3 This is a front sectional view of the quick self-locking rotating shaft fixture for the hollow shaft angular displacement potentiometer of the utility model;

[0022] Figure 4 It is a left view of the quick self-locking rotating shaft fixture for the hollow shaft angular displacement potentiometer described in the utility model;

[0023] Figure 5 It is a right view of the quick self-locking rotating shaft fixture for the hollow shaft angular displacement potentiometer described in the utility model;

[0024] Figure 6 It is a front cross-sectional view after the hollow shaft of the hollow shaft angular displacement potentiometer is clamped by the quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer of the utility model;

[0025] Figure 7 It is a left view after the hollow shaft of the hollow shaft angular displacement potentiometer is clamped by the quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer of the utility model;

[0026] Figure 8 It is a right view after the hollow shaft of the hollow shaft angular displacement potentiometer is clamped by the quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer of the utility model. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings:

[0028] like Figure 3-Figure 5As shown, the quick self-locking rotating shaft clamp for the hollow shaft angular displacement potentiometer of the utility model comprises a clamping shaft 14, an elastic component, a clamping plate 21 and a clamping pin 23. A clamping ring 15 protruding toward the circumferential direction and integrally formed is provided on the circumferential outer wall of the clamping shaft 14 near the first end of the two ends. A plurality of the elastic components are evenly installed on the clamping ring 15 along the circumferential direction. The elastic component comprises an elastic pin 20 and the elastic pin 20 has an elastic force in the direction of the second end of the two ends of the clamping shaft 14. A section of the outer diameter of the clamping shaft 14 near the second end is reduced to form a small diameter section 24 and an annular step (not marked in the figure) is formed at the location where the outer diameter changes. The small diameter The segment 24 is provided with a pin hole (not marked in the figure), the axial direction of the pin hole is perpendicular to the axial direction of the clamping shaft 14, the clamping pin 23 passes through the pin hole and both ends of the clamping pin 23 extend out of the small diameter segment 24, the clamping plate 21 is provided with a central through hole 25 and the circumferential hole walls of the central through hole 25 are respectively provided with "U"-shaped grooves 26 for allowing the clamping pin 23 to pass through on opposite sides, a positioning groove 22 is provided on one side surface of the clamping plate 21 and the center line of the positioning groove 22 passes through the center point of the central through hole 25 of the clamping plate 21, the clamping plate 21 is sleeved on the outside of the small diameter segment 24 through its own central through hole 25 and is located between the annular step and the clamping pin 23.

[0029] like Figure 3-Figure 5 As shown, the utility model also discloses the following more optimized specific structures:

[0030] In order to facilitate the installation of the elastic component and to facilitate the function of making the elastic pin 20 have an elastic force in the direction close to the second end of the clamping shaft 14, a plurality of through mounting screw holes (not marked in the figure) are evenly arranged on the clamping ring 15 along the circumferential direction. The elastic component also includes a sleeve 16 and a compression spring 18. The circumferential outer wall of the sleeve 16 is provided with an external thread and is installed in the corresponding mounting screw hole through the external thread. The inner ends of the compression spring 18 and the elastic pin 20 are both placed in the sleeve 16. The two ends of the compression spring 18 are located between the inner end of the elastic pin 20 and the inner wall of the sleeve 16 at one end away from the elastic pin 20, and the outer end of the elastic pin 20 is located outside the sleeve 16.

[0031] To facilitate processing and assembly, the elastic component also includes a cover plate 19. The end of the sleeve 16 corresponding to the elastic pin 20 is open and the cover plate 19 is installed at this end. The cover plate 19 is provided with a central through hole and the elastic pin 20 passes through the central through hole. The outer diameter of the inner end of the elastic pin 20 is increased and cannot pass through the central through hole of the cover plate 19.

[0032] In order to facilitate the operation of the clamping ring 15 by hand, the outer peripheral surface of the clamping ring 15 is provided with two mutually parallel planes.

[0033] In order to facilitate installation of the sleeve 16 by a hexagonal wrench, an end surface of the sleeve 16 away from the elastic pin 20 is provided with a hexagonal countersunk hole 17 .

[0034] In order to realize the positioning and clamping function by rotating 90° as usual, the length direction of the positioning groove 22 and the connecting line between the two “U”-shaped grooves 26 are perpendicular to each other.

[0035] In order to facilitate the operation of the clamping plate 21 by hand, the outer peripheral surface of the clamping plate 21 is provided with two mutually parallel planes.

[0036] In order to facilitate the rapid fixed connection between the clamping pin 23 and the clamping shaft 14 , the clamping pin 23 is connected to the hole wall of the pin hole by an adhesive.

[0037] In order to achieve a uniform and reliable clamping function for the rotating shaft of the potentiometer, there are four elastic components.

[0038] like Figure 3-Figure 8 As shown, when in use, first remove the clamping plate 21, then pass the small diameter section 24 of the clamping shaft 14 through the central through hole of the hollow shaft 6 of the hollow shaft angular displacement potentiometer, press the sleeve 16 by hand to make the elastic pin 20 press one end of the hollow shaft 6, and then put the clamping plate 21 on the outside of the small diameter section 24 of the clamping shaft 14 through its own central through hole 25 and the "U"-shaped groove 26. In this process, it is necessary to align the two ends of the clamping pin 23 with the two "U"-shaped grooves 26. Then rotate the clamping plate 21 until the clamping pin 23 corresponds to the positioning groove 22, and then release the sleeve 16. Under the action of the compression spring 18 and the elastic pin 20, the clamping pin 23 is placed in the positioning groove 22 to realize the anti-rotation function. At the same time, the four elastic pins 20 and the clamping plate 21 clamp the two ends of the hollow shaft 6 to realize the quick clamping function of the hollow shaft 6. When disassembling, the disassembly can be completed quickly by performing the reverse operation, thereby finally realizing the quick assembly and disassembly function of the hollow rotating shaft 6, and the operation is simple and fast.

[0039] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A quick self-locking shaft clamp for a hollow shaft angular displacement potentiometer, comprising a clamping shaft, characterized in that: It also includes an elastic component, a clamping plate and a clamping pin. A clamping ring protruding toward the circumferential direction and integrally formed is provided on the circumferential outer wall of the clamping shaft near the first end of the two ends. A plurality of elastic components are evenly installed on the clamping ring along the circumferential direction. The elastic component includes an elastic pin and the elastic pin has an elastic force in the direction of the second end of the two ends of the clamping shaft. A section of the outer diameter of the clamping shaft near the second end is reduced to form a small diameter section and an annular step is formed at the location where the outer diameter changes. The small diameter section is provided with a pin hole. The axial direction of the pin hole is aligned with The axial directions of the clamping shafts are perpendicular to each other, the clamping pins pass through the pin holes and both ends of the clamping pins extend out of the small diameter section, the clamping plate is provided with a central through hole and the circumferential hole walls of the central through hole are provided with "U"-shaped grooves on opposite sides for the clamping pins to pass through, a positioning groove is provided on one side surface of the clamping plate and the center line of the positioning groove passes through the center point of the central through hole of the clamping plate, the clamping plate is sleeved outside the small diameter section through its own central through hole and is located between the annular step and the clamping pin.

2. The quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer according to claim 1, characterized in that: The clamping ring is evenly provided with a plurality of through mounting screw holes along the circumferential direction. The elastic component also includes a sleeve and a compression spring. The circumferential outer wall of the sleeve is provided with an external thread and is installed in the corresponding mounting screw hole through the external thread. The inner ends of the compression spring and the elastic pin are both placed in the sleeve. The two ends of the compression spring are located between the inner end of the elastic pin and the inner wall of one end of the sleeve away from the elastic pin, and the outer end of the elastic pin is located outside the sleeve.

3. The quick self-locking rotating shaft fixture for the hollow shaft angular displacement potentiometer according to claim 2, characterized in that: The elastic component also includes a cover plate, one end of the sleeve corresponding to the elastic pin is open and the cover plate is installed on the end, the cover plate is provided with a central through hole and the elastic pin passes through the central through hole, and the outer diameter of the inner end of the elastic pin is increased and cannot pass through the central through hole of the cover plate.

4. The quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer according to claim 2 or 3, characterized in that: The outer peripheral surface of the clamping ring is provided with two planes which are parallel to each other.

5. The quick self-locking rotating shaft fixture for the hollow shaft angular displacement potentiometer according to claim 2 or 3, characterized in that: An inner hexagonal countersunk hole is arranged on an end surface of the sleeve away from the elastic pin.

6. The quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer according to claim 1, 2 or 3, characterized in that: The length direction of the positioning groove is perpendicular to the line connecting the two "U"-shaped grooves.

7. The quick self-locking shaft clamp for the hollow shaft angular displacement potentiometer according to claim 1, 2 or 3, characterized in that: The outer peripheral surface of the clamping plate is provided with two planes which are parallel to each other.

8. The quick self-locking shaft clamp for hollow shaft angular displacement potentiometer according to claim 1, 2 or 3, characterized in that: The clamping pin is connected to the hole wall of the pin hole by an adhesive.

9. The quick self-locking rotating shaft fixture for hollow shaft angular displacement potentiometer according to claim 1, 2 or 3, characterized in that: There are four elastic components.

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