Rotating shaft angle measuring device

Abstract

The utility model belongs to the technical field of rotating shaft processing, and discloses a rotating shaft angle measuring device which comprises a base, a clamp and a positioning assembly. The clamp is arranged on the base and used for clamping and fixing the rotating shaft; the positioning assembly comprises a positioning seat arranged on the base, a positioning column connected into the positioning seat in a sliding mode and a locking piece for locking the positioning column to the positioning seat, the anti-rotation face abuts against the top face of the positioning column, and the anti-rotation face abutting against the top face of the positioning column is parallel to the upper surface of the base. Through the arrangement, the angle between the upper surface of the base and the mounting inclined plane on the rotating shaft is equal to the angle between the anti-rotating plane and the mounting inclined plane, and the angle between the upper surface of the base and the mounting inclined plane can be easily measured through an angle measuring device such as an angle ruler, so that the detection of the machining quality of the mounting inclined plane is realized; and processing personnel can be helped to remove defective products, so that the working reliability of the circuit breaker is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rotating shaft processing technical field especially relates to a rotating shaft angle measuring device. BACKGROUND

[0002] The universal circuit breaker is generally provided with an under-voltage protection function, that is, an under-voltage release is arranged in the circuit breaker, and when the working voltage is lower than the set voltage value, the under-voltage release operates to disconnect the circuit breaker, so as to avoid the damage to the service life of the electrical appliance caused by the forced start and operation of the electrical appliance under the insufficient voltage.

[0003] In the prior art, the under-voltage release is generally linked with the rotating shaft through an under-voltage spring plate, and specifically, an installation slope is arranged on the outer peripheral wall of the rotating shaft, and the installation slope is used to be connected with one side of the under-voltage spring plate and abutted, so that the under-voltage spring plate can assist the under-voltage release to reset. Since the inclination angle of the installation slope can affect the elastic force of the under-voltage spring plate, and further affect the operation of the under-voltage release, the machining precision of the inclination angle of the installation slope is required to be high. In order to ensure the machining quality of the installation slope, the installation slope is generally machined based on the anti-rotation surface on the connecting block at the end of the rotating shaft which is used to be connected with the interlocking lever, but due to the particularity of the position of the installation slope, it is difficult to directly measure whether the angle between the installation slope and the anti-rotation surface machined meets the requirements by using the existing angle measuring equipment.

[0004] Therefore, it is urgent to provide a rotating shaft angle measuring device to solve the above technical problems. INVENTION CONTENTS

[0005] The utility model provides a rotating shaft angle measuring device for measuring the angle between the anti-rotation surface on the connecting block at the end of the rotating shaft and the installation slope on the peripheral wall of the rotating shaft, realizes the detection of the machining quality of the installation slope, and can help the machining personnel to eliminate defective products, so as to ensure the reliability of the operation of the circuit breaker.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The rotating shaft angle measuring device is used for measuring the angle between the anti-rotation surface of the connecting block at the end of the rotating shaft and the installation slope on the peripheral wall of the rotating shaft, and the rotating shaft angle measuring device comprises:

[0008] A base;

[0009] A clamp is arranged on the base, and the clamp is used to clamp and fix the rotating shaft;

[0010] The positioning assembly comprises a positioning base, a positioning column and a locking member, the positioning base is arranged on the base, the positioning column is slidingly connected in the positioning base, and the locking member is used for locking the positioning column in the positioning base, the anti-rotation surface abuts against the top surface of the positioning column, and the anti-rotation surface abutting against the top surface of the positioning column is parallel to the upper surface of the base.

[0011] Optionally, the positioning base is provided with a sliding cavity and a threaded hole vertically communicating with the sliding cavity, the sliding cavity is provided with an elastic member, one end of the positioning column is slidingly connected to the sliding cavity and abuts against the elastic member, and the locking member is provided with an external thread, the locking member is screwed to the threaded hole through the external thread and can abut against the positioning column.

[0012] Optionally, the positioning column is provided with a sliding groove extending along the sliding direction of the positioning column, the sliding groove is arranged opposite to the threaded hole, and the locking member can abut against the groove wall of the sliding groove.

[0013] Optionally, the bottom of the positioning column is provided with a mounting groove, one end of the elastic member is inserted into the mounting groove, and the other end of the elastic member abuts against the bottom wall of the sliding cavity.

[0014] Optionally, the peripheral wall of the positioning column is provided with a recess connected with the top surface of the positioning column, and one end of the connecting block of the rotating shaft extends into the recess and abuts against the positioning surface of the recess.

[0015] Optionally, the clamp comprises:

[0016] The clamp block is arranged on the upper surface of the base, and the clamp block is provided with a first clamping groove for fixing the rotating shaft;

[0017] The pressing block is connected with the clamp block, and the pressing block is used for pressing the rotating shaft in the first clamping groove.

[0018] Optionally, first and second connecting grooves are arranged on the clamp block on both sides of the first clamping groove, a first connecting shaft is arranged in the first connecting groove, one end of the first connecting shaft is rotationally connected with the pressing block, a second connecting shaft is arranged in the second connecting groove, one end of the second connecting shaft is rotationally connected with a fixing screw, an end portion of the other end of the pressing block is provided with a notch, and the other end of the fixing screw can pass through the notch and be connected with a nut.

[0019] Optionally, the pressing block is provided with a second clamping groove corresponding to the first clamping groove, and the second clamping groove and the first clamping groove can clamp and fix the rotating shaft.

[0020] Optionally, the first clamping groove and the second clamping groove are both in the shape of “V”.

[0021] Optionally, the clamps are provided in plurality, and the plurality of clamps are arranged in parallel and at intervals.

[0022] The utility model discloses the beneficial effect:

[0023] The utility model provides a pivot angle measuring device for measuring the angle between the anti -rotation surface of pivot end part connecting block and the installation inclined plane on pivot peripheral wall, including base, clamp and positioning assembly. When using, first pivot is placed on the clamp to make the connecting block of pivot end part opposite the positioning post of positioning assembly, then the height of positioning post is adjusted until the top surface of positioning post abuts on the anti -rotation surface of connecting block, after that adjustment clamp clamps and fixes pivot in this state. After fixing pivot, because the anti -rotation surface of abutting on the top surface of positioning post is parallel with the upper surface of base, therefore, the included angle between the upper surface of base and the installation inclined plane of pivot is equal to the included angle between the anti -rotation surface and the installation inclined plane, like this, only need to measure the included angle between the upper surface of base and the installation inclined plane to obtain the required angle, and the included angle between the upper surface of base and the installation inclined plane can be measured relatively easily by angle measuring device such as angle ruler, and then make the pivot angle measuring device can realize the detection to the processing quality of installation inclined plane, to help processing personnel to eliminate defective products, guarantee the reliability of circuit breaker work.

[0024] And, by setting the height of positioning post adjustable, make the pivot angle measuring device can be applicable to the pivot of different diameter size, and the universality is higher. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be to the embodiment of the utility model needed to use the brief introduction of drawing, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to the content of the embodiment of the utility model and these drawings.

[0026] Figure 1 It is the part schematic diagram of pivot in prior art;

[0027] Figure 2 It is the assembly drawing of pivot angle measuring device and pivot provided by the embodiment of the utility model;

[0028] Figure 3 It is Figure 2 The enlarged view at A;

[0029] Figure 4 It is the exploded schematic view of positioning assembly provided by the embodiment of the utility model;

[0030] Figure 5is a sectional view of the positioning assembly provided by the embodiment of the utility model;

[0031] Figure 6 is a structural schematic diagram of the clamp under one view provided by the embodiment of the utility model;

[0032] Figure 7 is a structural schematic diagram of the clamp under another view provided by the embodiment of the utility model;

[0033] Figure 8 is a partial exploded schematic diagram of the clamp provided by the embodiment of the utility model.

[0034] In the drawing:

[0035] 10, rotating shaft; 11, connecting block; 101, anti-rotation surface; 12, installation inclined surface; 13, end surface; 20, angle ruler;

[0036] 100, base; 110, upper surface;

[0037] 200, clamp; 210, clamping block; 211, first clamping groove; 212, first connecting groove; 213, second connecting groove; 220, pressing block; 221, notch; 222, second clamping groove; 230, first connecting shaft; 240, second connecting shaft; 250, fixing screw rod; 260, nut;

[0038] 300, positioning assembly; 310, positioning seat; 311, sliding cavity; 312, threaded hole; 320, positioning column; 321, top surface; 322, sliding groove; 323, installation groove; 324, recessed part; 3241, positioning surface; 330, locking piece; 340, elastic piece. DETAILED DESCRIPTION

[0039] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0040] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through the intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is on, above and on of second feature includes that first feature is directly above and obliquely above of second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature is under, below and under of second feature includes that first feature is directly below and obliquely below of second feature, or only indicates that horizontal height of first feature is less than second feature.

[0042] In the description of the embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0043] As Figure 1 shown, in the prior art, the under-voltage release is generally linked with the rotating shaft 10 through the under-voltage spring. Specifically, the outer wall of the rotating shaft 10 is provided with a mounting slope 12, which is connected to one side of the under-voltage spring and abuts against the under-voltage spring, so that the under-voltage spring can assist the under-voltage release to reset. Since the inclination angle of the mounting slope 12 can affect the elastic force of the under-voltage spring, and further affect the operation of the under-voltage release, the machining precision of the inclination angle of the mounting slope 12 is required to be high. In order to ensure the machining quality of the mounting slope 12, the machining of the mounting slope 12 is generally based on the anti-rotation surface 101 on the connecting block 11 at the end of the rotating shaft 10 for connection with the interlocking lever, but due to the particularity of the position of the mounting slope 12, it is difficult to directly measure the angle between the mounting slope 12 machined and the anti-rotation surface 101 by using the existing angle measuring equipment. This will cause the defective products to flow into the next process, and ultimately affect the operation reliability of the finished circuit breaker.

[0044] Based on the above problems, the embodiment provides a rotating shaft angle measuring device for measuring the angle between the anti-rotation surface 101 on the connecting block 11 at the end of the rotating shaft 10 and the mounting slope 12 on the wall of the rotating shaft 10, realizing the detection of the machining quality of the mounting slope 12, and helping the machining personnel to remove defective products to ensure the reliability of the operation of the circuit breaker.

[0045] Specifically, as Figure 2 and Figure 3As shown, the pivot angle measuring device comprises a base 100, a clamp 200 and a positioning assembly 300. The clamp 200 is arranged on the base 100 and used to clamp and fix the pivot 10. The positioning assembly 300 comprises a positioning seat 310, a positioning column 320 and a locking piece 330. The positioning seat 310 is arranged on the base 100, the positioning column 320 is slidingly connected to the positioning seat 310, and the locking piece 330 is used to lock the positioning column 320 to the positioning seat 310. The anti-rotation surface 101 is abutted against the top surface 321 of the positioning column 320, and the anti-rotation surface 101 abutted against the top surface of the positioning column 320 is parallel to the upper surface 110 of the base 100.

[0046] By arranging the anti-rotation surface 101 abutted against the top surface of the positioning column 320 to be parallel to the upper surface 110 of the base 100, the angle between the anti-rotation surface 101 to be measured and the installation inclined surface 12 is equal to the angle between the upper surface 110 of the base 100 and the installation inclined surface 12, that is, measuring the angle between the upper surface 110 of the base 100 and the installation inclined surface 12 is equivalent to measuring the angle between the anti-rotation surface 101 and the installation inclined surface 12. The angle between the upper surface 110 of the base 100 and the installation inclined surface 12 can be easily measured by an angle measuring device such as the angle ruler 20, and the purpose of using the pivot angle measuring device to detect whether the processing quality of the installation inclined surface 12 is qualified is achieved, which helps the processing personnel to eliminate defective products and ensures the reliability of the circuit breaker.

[0047] In this embodiment, the clamp 200 can clamp and fix the pivot 10 in a manner that the axis is parallel to the upper surface 110 of the base 100.

[0048] Continuing to refer to Figure 2 and Figure 3 , the method steps for using the pivot angle measuring device to detect the angle between the installation inclined surface 12 and the anti-rotation surface 101 on the pivot 10 are as follows:

[0049] Firstly, the pivot 10 is placed on the clamp 200 in a manner that the axis is parallel to the upper surface 110 of the base 100, and the end of the pivot 10 provided with the connecting block 11 is located above the positioning assembly 300;

[0050] Then, the height of the positioning column 320 is adjusted, and the pivot 10 is rotated at the same time. When the top surface 321 of the positioning column 320 abuts against the anti-rotation surface 101 of the connecting block 11, the positioning column 320 is locked to the positioning seat 310 by the locking piece 330;

[0051] Finally, one edge of the angle ruler 20 is abutted against the upper surface 110 of the base 100, and the other edge is abutted against the installation inclined surface 12. The degree of the angle ruler 20 is read, and the measurement result is the angle between the anti-rotation surface 101 and the installation inclined surface 12.

[0052] It can be understood that other angle measuring devices can also be used to measure the angle between the upper surface 110 of the base 100 and the mounting slope 12. Since the structure of the angle ruler 20 is prior art, the specific structure will not be described in detail.

[0053] The shaft angle measuring device has simple structure, is convenient to operate, has high measurement accuracy, can be adapted to shafts 10 of different diameters by adjusting the height of the positioning column 320, and has high universality.

[0054] Optionally, continuing to refer to Figure 2 In the embodiment, the base 100 has a plate structure, which is simple in structure, convenient to process, and low in cost.

[0055] Further, as Figures 3-5 shown, the positioning seat 310 is provided with a sliding cavity 311 and a threaded hole 312 perpendicular to and communicating with the sliding cavity 311, the sliding cavity 311 is provided with an elastic member 340, one end of the positioning column 320 is slidingly connected to the sliding cavity 311 and abuts against the elastic member 340, that is, one end of the elastic member 340 abuts against the bottom of the sliding cavity 311 and the other end abuts against the bottom of the positioning column 320. The locking member 330 is provided with external threads, the locking member 300 is screwed to the threaded hole 312 through the external threads and can abut against the positioning column 320, and the positioning column 320 can be locked on the positioning seat 310 by abutting the locking member 300 against the positioning column 320.

[0056] Specifically, the use method of the positioning assembly 300 is as follows:

[0057] First, the locking member 300 is rotated to move away from the positioning column 320, and at this time the elastic member 340 is in a relaxed state;

[0058] Then, when the connecting block 11 of the shaft 10 contacts the top surface 321 of the positioning column 320, the positioning column 320 will move downward under the pressure of the connecting block 11 to compress the elastic member 340, and in this case the shaft 10 is rotated, and when the anti-rotation surface 101 of the connecting block 11 is opposite to the top surface 321 of the positioning column 320, the top surface 321 of the positioning column 320 will automatically abut against the anti-rotation surface 101 under the action of the elastic member 340;

[0059] After that, the locking member 300 is rotated to abut the end of the locking member 300 against the positioning column 320, and the positioning column 320 is locked on the positioning seat 310, that is, the position of the positioning column 320 remains unchanged, and at this time the anti-rotation surface 101 and the top surface 321 of the positioning column 320 remain in abutting state.

[0060] By setting the elastic member 340, the automatic abutment of the positioning column 320 and the anti-rotation surface 101 can be realized, without manually adjusting the position of the positioning column 320, thereby improving the operation convenience. Moreover, the locking and unlocking between the positioning column 320 and the positioning seat 310 are realized through the cooperation of the locking member 300 and the threaded hole 312, which is simple to operate and has high reliability in locking the working of the positioning column 320.

[0061] It can be understood that the elastic member 340 can be selected but is not limited to a spring.

[0062] Optionally, continuing to refer to Figure 4 and Figure 5 , the positioning column 320 is provided with a sliding groove 322 extending along the sliding direction thereof, the sliding groove 322 is oppositely arranged with the threaded hole 312, and the locking member 300 can abut against the groove wall of the sliding groove 322. By setting the sliding groove 322 on the positioning column 320, on the one hand, the sliding direction of the positioning column 320 can be guided, thereby improving the smoothness of the sliding of the positioning column 320; on the other hand, the cooperation of the sliding groove 322 and the locking member 300 can limit the sliding stroke of the positioning column 320, thereby avoiding the disengagement of the positioning column 320 from the positioning seat 310.

[0063] Optionally, continuing to refer to Figure 5 , the bottom of the positioning column 320 is provided with a mounting groove 323, the mounting groove 323 is used for being inserted with one end of the elastic member 340, and the other end of the elastic member 340 abuts against the bottom wall of the sliding cavity 311. By setting the mounting groove 323 to fix the elastic member 340, the mounting stability of the elastic member 340 can be improved, thereby improving the reliability of the working of the elastic member 340.

[0064] Further, continuing to refer to Figure 4 and Figure 5 , the peripheral wall of the positioning column 320 is provided with a recessed portion 324 connected with the top surface 321 of the positioning column 320, and one end of the connecting block 11 of the rotating shaft 10 extends into the recessed portion 324 and abuts against the positioning surface 3241 of the recessed portion 324. That is, in the working of the positioning column 320, the top surface 321 abuts against the anti-rotation surface 101 on the connecting block 11, and the positioning surface 3241 of the recessed portion 324 abuts against the end surface 13 of the rotating shaft 10. By such a setting, the contact area between the positioning column 320 and the rotating shaft 10 is increased, thereby improving the positioning and supporting effect.

[0065] Further, continuing to refer to Figure 2 , a plurality of clamps 200 can be arranged, and the plurality of clamps 200 are arranged in parallel and at intervals. By such a setting, the rotating shaft 10 can be supported at various positions, thereby improving the stress uniformity of the rotating shaft 10 and being beneficial to the protection of the rotating shaft 10.

[0066] In the embodiment, three clamps 200 are provided. In other embodiments, the number of clamps 200 can also be set to other, such as two, four, etc., which can be set according to actual needs, and the present application does not make specific limitations.

[0067] Further, as shown in Figures 6-8 The clamp 200 includes a clamping block 210 and a pressing block 220. The clamping block 210 is arranged on the upper surface 110 of the base 100, and the clamping block 210 is provided with a first clamping groove 211 for fixing the rotating shaft 10. The pressing block 220 is connected with the clamping block 210 to press the rotating shaft 10 in the first clamping groove 211, that is, the pressing block 220 and the first clamping groove 211 can realize clamping and fixing of the rotating shaft 10. The clamp 200 has simple structure and is convenient to operate, and has better effect of fixing the rotating shaft 10.

[0068] Optionally, continuing to refer to Figures 6-8 In the embodiment, one end of the pressing block 220 is rotatably connected with the clamping block 210, and the other end of the pressing block 220 can be locked and unlocked with the clamping block 210 to clamp and fix the rotating shaft 10 or release the fixing of the rotating shaft 10. Specifically, the clamping block 210 is provided with a first connecting groove 212 and a second connecting groove 213 on both sides of the first clamping groove 211, the first connecting groove 212 is provided with a first connecting shaft 230, the first connecting shaft 230 is rotatably connected with one end of the pressing block 220, the second connecting groove 213 is provided with a second connecting shaft 240, the second connecting shaft 240 is rotatably connected with one end of a fixing screw 250, and the other end of the pressing block 220 is provided with a notch 221, and the other end of the fixing screw 250 can pass through the notch 221 and be connected with a nut 260.

[0069] The steps of fixing the rotating shaft 10 by using the clamp 200 are as follows:

[0070] First, loosen the nut 260 so that the fixing screw 250 can be pulled out of the notch 221, and at this time the pressing block 220 is in a free state;

[0071] Then, rotate the pressing block 220 to make it away from the first clamping groove 211;

[0072] Then, place the rotating shaft 10 in the first clamping groove 211;

[0073] Then, rotate the pressing block 220 to press on the rotating shaft 10, and rotate the fixing screw 250 to make it enter the notch 221;

[0074] Finally, tighten the nut 260 to lock the pressing block 220, so that the pressing block 220 can continuously press the rotating shaft 10 in the first clamping groove 211.

[0075] By setting one end of the pressing block 220 in rotational connection with the clamping block 210, the opening and closing of the pressing block 220 relative to the clamping block 210 can be realized, so as to facilitate the installation and dismounting of the rotating shaft 10, and the clamping block 210 does not need to be dismounted, and the operation difficulty is relatively low. The other end of the pressing block 220 is locked with the clamping block 210 through the fixing screw rod 250 and the nut 260, the structure is simple, the operation is facilitated, and the locking reliability is relatively good.

[0076] Optionally, in the embodiment, the pressing block 220 is in "L" shape.

[0077] Optionally, the nut 260 can be selected as a wing nut.

[0078] Further, continuing to refer to Figures 6-8 The pressing block 220 is provided with a second clamping groove 222 corresponding to the first clamping groove 211, and the second clamping groove 222 and the first clamping groove 211 can clamp and fix the rotating shaft 10. By setting the second clamping groove 222 on the pressing block 220 in cooperation with the first clamping groove 211, the clamping effect on the rotating shaft 10 can be improved.

[0079] Optionally, the first clamping groove 211 and the second clamping groove 222 can both be in "V" shape, so that the clamp 200 can be suitable for rotating shafts 10 of various diameters, and the universality is relatively high.

[0080] Optionally, in another possible embodiment, one end of the pressing block 220 can also be connected with the clamping block 210 through a connecting plate, the other end of the pressing block 220 can be locked and unlocked with the clamping block 210, so as to clamp and fix the rotating shaft 10 or release the fixing of the rotating shaft 10, and the position of the clamping block 210 on the connecting plate is adjustable, so as to be suitable for rotating shafts 10 of different diameters. In other possible embodiments, both ends of the pressing block 220 can also be connected with the clamping block 210 through bolts, and the structure is simple and the operation is facilitated.

[0081] Obviously, the above embodiments of the utility model are only for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A shaft angle measuring device for measuring the angle between the anti-rotation surface (101) of the end connecting block (11) of a shaft (10) and the installation inclined surface (12) on the peripheral wall of the shaft (10), characterized in that, The rotation shaft angle measuring device comprises: a base (100); a clamp (200) arranged on the base (100), the clamp (200) being used for clamping and fixing the rotation shaft (10); a positioning assembly (300) comprising a positioning seat (310), a positioning column (320) and a locking member (330), the positioning seat (310) being arranged on the base (100), the positioning column (320) being slidingly connected in the positioning seat (310), and the locking member (330) being used for locking the positioning column (320) in the positioning seat (310), the anti-rotation surface (101) abutting against a top surface (321) of the positioning column (320), and the anti-rotation surface (101) abutting against the top surface (321) of the positioning column (320) being parallel to an upper surface (110) of the base.

2. The pivot angle measuring device according to claim 1, characterized in that The positioning seat (310) is provided with a sliding cavity (311) and a threaded hole (312) vertically and communicatively arranged on the positioning seat (310), the sliding cavity (311) is provided with an elastic member (340), one end of the positioning column (320) is slidingly connected to the sliding cavity (311) and abuts against the elastic member (340), and the locking member (330) is provided with external threads, the locking member (330) is screwed to the threaded hole (312) through the external threads and can abut against the positioning column (320).

3. The pivot angle measuring device according to claim 2, characterized in that The positioning column (320) is provided with a sliding groove (322) extending along the sliding direction of the positioning column (320), the sliding groove (322) is oppositely arranged relative to the threaded hole (312), and the locking member (330) can abut against the groove wall of the sliding groove (322).

4. The pivot angle measuring device according to claim 2, characterized in that The bottom of the positioning column (320) is provided with a mounting groove (323), one end of the elastic member (340) is inserted into the mounting groove (323), and the other end of the elastic member (340) abuts against the bottom wall of the sliding cavity (311).

5. The pivot angle measuring device according to claim 1, characterized in that The peripheral wall of the positioning column (320) is provided with a recessed portion (324) connected to the top surface (321) of the positioning column (320), and one end of the rotation shaft (10) provided with the connecting block (11) extends into the recessed portion (324) and abuts against a positioning surface (3241) of the recessed portion (324).

6. The pivot angle measuring device according to any one of claims 1 to 5, characterized in that The clamp (200) comprises: a clamp block (210) arranged on the upper surface (110) of the base (100), the clamp block (210) being provided with a first clamping groove (211) used for fixing the rotation shaft (10); a pressing block (220) connected to the clamp block (210), the pressing block (220) being used for pressing the rotation shaft (10) against the first clamping groove (211).

7. The pivot angle measuring device according to claim 6, characterized in that On the clamp block (210), first connecting groove (212) and second connecting groove (213) are respectively arranged on both sides of the first clamping groove (211), the first connecting groove (212) is internally provided with a first connecting shaft (230), the first connecting shaft (230) is rotatably connected with one end of the pressing block (220), the second connecting groove (213) is internally provided with a second connecting shaft (240), the second connecting shaft (240) is rotatably connected with one end of a fixed screw rod (250), the other end of the pressing block (220) is provided with a notch (221), the other end of the fixed screw rod (250) can be arranged in the notch (221) and connected with a nut (260).

8. The pivot angle measuring device according to claim 6, characterized in that The pressing block (220) is provided with a second clamping groove (222) corresponding to the first clamping groove (211), and the second clamping groove (222) and the first clamping groove (211) can clamp and fix the rotating shaft (10).

9. The pivot angle measuring device according to claim 8, characterized in that The first clamping groove (211) and the second clamping groove (222) are both "V"-shaped.

10. The pivot angle measuring device according to any one of claims 1 to 5, characterized in that The clamp (200) is provided with a plurality of clamps (200), and a plurality of clamps (200) are arranged in parallel and at intervals.

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