Detection shaft and detection mechanism for assisting product shaft in torque detection

Abstract

The invention discloses a detection shaft and a detection mechanism for assisting a product shaft in torque detection, and relates to the technical field of torque detection.The detection shaft comprises a shaft body and a limiting flange, a mounting end and a detection end are formed at the two ends of the shaft body respectively, and the detection end protrudes in the direction away from the mounting end to form an insertion column; the limiting flange is formed by protruding from the peripheral edge of the detection end in the direction away from the installation end, the limiting flange is arranged outside the insertion column in a surrounding mode, the limiting flange and the insertion column define an insertion cavity for a product shaft to be inserted, the end, away from the detection end, of the insertion cavity is open, and the insertion end can stretch into the insertion cavity through the opening so that the insertion column can be inserted into the insertion groove. And the limiting flange is matched with the inserting column to lock the inserting end. According to the technical scheme, the limiting flange abuts against the inserting column, so that the product shaft cannot swing, transverse movement of the product shaft is limited, the inserting column and the inserting groove are locked, so that the product shaft cannot axially rotate, and clamping of the product shaft is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of torque detection, and particularly relates to a detection shaft and a detection mechanism for assisting a product shaft in torque detection. Background Art

[0002] Torque detection of a product to be tested, such as a motor, as a key performance detection link before the motor leaves the factory, can effectively evaluate the actual output ability of the motor and ensure that it meets the design specifications and application requirements. Torque detection can not only verify key parameters such as the rated torque and peak torque of the motor, but also detect the running stability and efficiency of the motor under different load conditions, and avoid affecting the performance of the final product due to insufficient torque or excessive fluctuations. In addition, potential manufacturing defects, such as winding faults, magnetic circuit abnormalities or bearing losses, can be found through torque detection, thereby improving product consistency and reliability and ensuring the long-term stable operation of the motor in actual applications.

[0003] However, when torque detection is performed on a motor with a relatively small product shaft size in the prior art, due to the relatively small size and surface area of the product shaft, during the process of clamping the product shaft with a fixture, the contact area between the product shaft and the fixture is relatively small, and the clamping stability cannot be ensured, making it possible for the product shaft to slip, resulting in inaccurate detection results of torque detection. Summary of the Invention

[0004] The main purpose of the present invention is to propose a detection shaft and a detection mechanism for assisting a product shaft in torque detection, aiming to solve the problem that when torque detection is performed on a motor with a relatively small product shaft size in the prior art, the clamping stability cannot be ensured, resulting in inaccurate detection results.

[0005] To achieve the above object, the detection shaft for assisting a product shaft in torque detection proposed by the present invention, one end of the product shaft forms a plug-in end, and a plug-in groove is provided in the plug-in end. The detection shaft includes:

[0006] A shaft body, both ends of the shaft body respectively form a mounting end and a detection end, and the detection end protrudes in a direction away from the mounting end to form a plug-in column;

[0007] A limiting flange, the limiting flange protrudes in a direction away from the mounting end from the outer peripheral edge of the detection end, the limiting flange surrounds the plug-in column and forms a plug-in cavity for the product shaft to be inserted with the plug-in column. The plug-in cavity is coaxially arranged with the plug-in column, one end of the plug-in cavity away from the detection end is open, the plug-in end can extend into the plug-in cavity through the open end, so that the plug-in column is inserted into the plug-in groove, and the limiting flange and the plug-in column cooperate to lock the plug-in end, so as to coaxially fix the product shaft and the detection shaft.

[0008] In one embodiment, the insertion post is a prism, and a surface of the insertion post facing away from the mounting end is a polygonal abutting surface. At least one edge of the abutting surface abuts against a wall of the insertion slot to cooperate with the limiting flange to lock the insertion end.

[0009] In one embodiment, the insertion post is a quadrangular prism, the abutting surface is a quadrilateral, the insertion slot includes two walls arranged at an angle, and two opposite edges of the abutting surface respectively abut against the two walls of the insertion slot.

[0010] In one embodiment, the abutting surface includes two first edges arranged oppositely and two second edges arranged oppositely. The two first edges respectively abut against the walls of the insertion slot, and the two second edges are arc-shaped.

[0011] In one embodiment, the diameters of the two second edges are both 0.92 mm to 0.94 mm, and the distance between the two first edges is 0.49 mm to 0.51 mm.

[0012] In one embodiment, the limiting flange includes a plurality of spaced limiting protrusions, and a gap communicating with the insertion cavity is formed between any two adjacent limiting protrusions. The two edges of the insertion post abutting against the two walls of the insertion slot respectively correspond to two of the gaps.

[0013] In one embodiment, the insertion slot includes two walls arranged oppositely, and the two walls are used to abut against a surface of the insertion post facing away from the mounting end. The two walls are both arranged at an angle with the axis of the product shaft, and the angle is 6° to 15°.

[0014] In one embodiment, all edges of the abutting surface are provided with rounded corners; and / or, the position of the limiting flange corresponding to the open end is provided with rounded corners on the side facing the insertion cavity.

[0015] In one embodiment, the insertion cavity forms multiple pairs of insertion areas around the insertion post, and each pair of insertion areas is arranged oppositely; two insertion walls are respectively formed on two sides of the insertion slot of the insertion end, and the two insertion walls can selectively extend into a pair of insertion areas through the open end.

[0016] In one embodiment, the insertion post is a quadrangular prism, and the insertion cavity forms two pairs of insertion areas around the insertion post, and each insertion area corresponds to an edge of the insertion post.

[0017] In one embodiment, the product shaft is cylindrical, a surface of the limiting flange facing the insertion post is an arc surface, and the limiting flange encloses a cylindrical insertion cavity, and the shape of the insertion cavity is adapted to the shape of the product shaft.

[0018] The present invention further provides a detection mechanism, which applies the above-mentioned detection shaft, and the detection end of the detection shaft is used to fix the product shaft.

[0019] The technical solution of the present invention is to provide a plugging groove on the plugging end of the product shaft, and form a plugging column protruding from the detection end of the shaft body, and a limiting flange protruding from the outer edge of the detection end, so that the limiting flange and the plugging column enclose a plugging cavity. After the plugging end is inserted into the plugging cavity, the abutment of the limiting flange and the plugging column prevents the product shaft from swinging, restricting the lateral movement of the product shaft, and the locking of the plugging column and the plugging groove prevents the product shaft from rotating axially, thereby completing the clamping of the product shaft. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0021] Figure 1 Schematic assembly diagram of the detection shaft and the product shaft provided by an embodiment of the present invention;

[0022] Figure 2 Schematic disassembly diagram of the detection shaft and the product shaft provided by an embodiment of the present invention;

[0023] Figure 3 Schematic bottom view structure diagram of the detection shaft provided by an embodiment of the present invention;

[0024] Figure 4 Schematic bottom view structure diagram of another detection shaft provided by an embodiment of the present invention;

[0025] Figure 5 Schematic structure diagram of the detection shaft provided by an embodiment of the present invention.

[0026] Explanation of the reference numerals in the drawings:

[0027] 100, detection shaft; 1, shaft body; 11, installation end; 12, detection end; 13, plugging column; 14, abutment surface; 141, first edge; 142, second edge; 2, limiting flange; 21, plugging cavity; 22, limiting protrusion; 23, gap; 24, plugging area;

[0028] 200, product shaft; 201, plugging end; 202, plugging groove; 2021, groove wall.

[0029] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] When detecting the torque of a motor with a small product shaft size in the prior art, due to the small size and small surface area of its product shaft, during the process of clamping the product shaft with a fixture, the contact area between the product shaft and the fixture is small, and the clamping stability cannot be ensured, making it possible for the product shaft to slip, resulting in inaccurate torque detection results.

[0034] To solve the above problems, the present invention proposes a detection shaft 100 for assisting the torque detection of the product shaft 200.

[0035] Please combine Figure 1 and Figure 2, the detection shaft 100 for torque detection of the auxiliary product shaft 200 in this embodiment. One end of the product shaft 200 forms a plug-in end 201, and a plug-in groove 202 is provided in the plug-in end 201. The detection shaft 100 includes a shaft body 1 and a limiting flange 2. Installation ends 11 and a detection end 12 are respectively formed at both ends of the shaft body 1, and a plug-in column 13 protrudes from the detection end 12 in a direction away from the installation end 11; the limiting flange 2 protrudes from the outer peripheral edge of the detection end 12 in a direction away from the installation end 11, and the limiting flange 2 surrounds the plug-in column 13 and forms a plug-in cavity 21 for the product shaft 200 to be inserted with the plug-in column 13. The plug-in cavity 21 is coaxially arranged with the plug-in column 13, and one end of the plug-in cavity 21 away from the detection end 12 is open. The plug-in end 201 can extend into the plug-in cavity 21 through the open end, so that the plug-in column 13 is inserted into the plug-in groove 202, and the cooperation between the limiting flange 2 and the plug-in column 13 locks the plug-in end 201 to coaxially fix the product shaft 200 and the detection shaft 100.

[0036] When torque detection needs to be performed on a product to be tested, such as a motor, the technical solution of the present invention forms a plug-in groove 202 on the plug-in end 201 of the product shaft 200, and a plug-in column 13 protrudes from the detection end 12 of the shaft body 1, and a limiting flange 2 protrudes from the outer edge of the detection end 12, so that the limiting flange 2 and the plug-in column 13 enclose a plug-in cavity 21. After the plug-in end 201 is inserted into the plug-in cavity 21, the abutment between the limiting flange 2 and the plug-in column 13 makes the product shaft 200 not swing, restricting the radial movement of the product shaft 200, and the locking between the plug-in column 13 and the plug-in groove 202 makes the product shaft 200 not rotate axially, thus completing the clamping of the product shaft 200. And the coaxial fixation of the product shaft 200 and the detection shaft 100 makes it impossible for the product shaft 200 and the detection shaft 100 to have relative slippage, and the product shaft 200 and the detection shaft 100 can rotate synchronously, improving the accuracy of torque detection. At the same time, the coaxial rotation of the product shaft 200 and the detection shaft 100 does not generate centrifugal force along the circumferential direction, thus improving the stability of the product shaft 200 and the detection shaft 100.

[0037] It can be understood that when torque detection is performed on a motor, first insert the product shaft 200 of the motor into the plug-in cavity 21, so that the limiting flange 2 abuts against the outer wall surface of the product shaft 200, and the plug-in column 13 abuts against the groove wall 2021 of the plug-in groove 202, thereby clamping the product shaft 200 from opposite sides. The shape of the plug-in column 13 needs to form a surface contact with the groove wall 2021 of the plug-in groove 202, so as to give the product shaft 200 a circumferential binding force. At the same time, the abutment between the plug-in column 13 and the groove wall 2021 of the plug-in groove 202 makes the product shaft 200 not rotate relative to the shaft body 1, thus realizing the fixation of the product shaft 200. Then start the motor, the product shaft 200 drives the detection shaft 100 to rotate, and the torque of the motor is detected by a torque detection device provided on the detection shaft 100, such as a torque sensor.

[0038] Please combine with Figures 3 to 5 In an embodiment, the insertion post 13 is a prism. The surface of the insertion post 13 facing away from the mounting end 11 is a polygonal abutting surface 14. At least one edge of the abutting surface 14 abuts against the wall 2021 of the insertion slot 202 to lock the insertion end 201 in cooperation with the limiting flange 2.

[0039] When the insertion post 13 is a prism, any at least one edge of the abutting surface 14 can abut against the wall 2021 of the insertion slot 202 to limit the insertion slot 202. By abutting against edges in different orientations and with different numbers, the insertion post 13 can be adapted to insertion slots 202 of different sizes, improving the adaptability of the detection shaft 100 to product shafts 200 of different models.

[0040] Specifically, the insertion post 13 is a quadrangular prism, the abutting surface 14 is a quadrilateral, the insertion slot 202 includes two walls 2021 arranged at an angle, and the two opposite edges of the abutting surface 14 respectively abut against the two walls 2021 of the insertion slot 202.

[0041] The two opposite edges of the abutting surface 14 respectively abut against two of the sides of the quadrilateral, forming a surface contact. When the product shaft 200 has a tendency to rotate, the clamping action between the edges of the insertion post 13 and the wall 2021 provides a stronger anti-slip ability, preventing the product shaft 200 from rotating or loosening during the clamping process. Compared with a polygon, the multiple edges of the polygonal insertion post 13 result in a smaller side length for each side under the same size, and a smaller contact area with the insertion slot 202, which may lead to a smaller pressure on each contact surface and thus a reduced clamping force. The quadrangular prism structure only provides two key contact surfaces, resulting in a greater contact pressure per unit area, improving the clamping stability and reducing the risk of slip.

[0042] At the same time, the design of setting the insertion slot 202 to be arranged at an angle makes the width of the insertion slot 202 gradually become narrower along its depth direction. Therefore, there is always a position where the insertion slot 202 can be exactly inserted tightly with the insertion post 13, and the insertion slot 202 can be adapted to insertion posts 13 of different sizes, improving the adaptability of the product shaft 200 to the detection shaft 100.

[0043] It can be understood that the two walls 2021 of the insertion slot 202 are arranged at an angle to form a V-shaped groove. However, in order to reduce stress concentration and increase strength, the bottom of the groove can be provided with a rounded corner.

[0044] In an embodiment, the abutting surface 14 includes two relatively arranged first edges 141 and two relatively arranged second edges 142. The two first edges 141 respectively abut against the walls 2021 of the insertion slot 202, and the two second edges 142 are arranged in an arc shape.

[0045] The conventional prismatic plug-in column 13 may be worn or damaged due to stress concentration at the corners under high torque. The arc-shaped second edge 142 can smoothly transition and reduce local stress concentration, thereby extending the service life of the detection shaft 100 and the product shaft 200. At the same time, the arc-shaped second edge 142 gives the plug-in column 13 higher strength and torsion resistance.

[0046] In one embodiment, the diameters of the two second edges 142 are both 0.92 mm to 0.94 mm, and the distance between the two first edges 141 is 0.49 mm to 0.51 mm.

[0047] In a specific application scenario, the two first edges 141 are long edges, and the two second edges 142 are short edges. Therefore, the spacing between the two first edges 141 is small. When 0.49mm to 0.51mm is selected, it can be adapted to the product shaft 200 of most small-sized motors, and it is more applicable. When the diameters of the two second edges 142 are both 0.92mm to 0.94mm, the smooth transition effect is better, and higher strength and torsional resistance can be provided.

[0048] In one embodiment, the limiting flange 2 includes a plurality of spaced limiting protrusions 22, and a gap 23 connected to the plug-in cavity 21 is formed between any two adjacent limiting protrusions 22. The two edges of the plug-in column 13 that abut against the two groove walls 2021 of the plug-in groove 202 correspond to two of the gaps 23 respectively.

[0049] It can be understood that the two sides of the plug-in slot 202 are usually through-designed, that is, the product axis 200 corresponding to the two sides of the plug-in slot 202 does not have an outer wall. Therefore, when the plug-in column 13 is a quadrilateral, the gap 23 is designed to correspond to the two groove walls 2021 abutting against the plug-in slot 202. At this time, the through-points on both sides of the plug-in slot 202 are also set corresponding to the gap 23, so that the product axis 200 does not have an outer wall surface and does not need to be set with a limiting protrusion 22, which saves materials and optimizes the spatial layout.

[0050] In one embodiment, the plug-in slot 202 includes two slot walls 2021 arranged opposite to each other, and the two slot walls 2024 are used to abut against the side of the plug-in column 13 facing away from the mounting end 11. The two slot walls 2021 are arranged at an angle with the axis of the product shaft 200, and the angle is 6° to 15°.

[0051] After testing, it was found that if the angle between the two groove walls 2021 is too large, the pressure generated between the detection shaft 100 and the product shaft 200 will be too large, which will not only affect the accuracy of the torque test, but also make it difficult for the product shaft 200 to drive the test shaft to rotate. Therefore, when the angle is set to 6°~15°, the pressure generated between the detection shaft 100 and the product shaft 200 is about 1N, the error is acceptable, and the impact on the torque test is not significant.

[0052] In one embodiment, each edge of the abutting surface 14 is provided with a rounded corner. On the one hand, the right-angle edge may interfere with the product shaft 200 when the product shaft 200 is inserted into the insertion cavity 21, resulting in difficult assembly and even possible jamming due to friction. Therefore, the rounded-corner setting can play a guiding and transitional role for the product shaft 200, reduce the friction between the abutting surface 14 and the product shaft 200, improve the convenience of assembly, and reduce the assembly difficulty. On the other hand, during long-term use, there is relative movement between the product shaft 200 and the abutting surface 14. The right-angle edge may be worn due to friction, resulting in inaccurate positioning or loosening, affecting the fixing accuracy of the product shaft 200. Therefore, the rounded-corner design can reduce friction, lower the wear rate, make the clamping more stable, and maintain long-term fixing accuracy.

[0053] In one embodiment, the position of the limiting flange 2 corresponding to the open end is provided with a rounded corner toward one side of the insertion cavity 21. And the limiting flange 2 may also interfere with the product shaft 200, resulting in difficult assembly and even possible jamming due to friction. Therefore, the rounded-corner setting can play a guiding and transitional role for the product shaft 200, reduce the friction between the abutting surface 14 and the product shaft 200, improve the convenience of assembly, and reduce the assembly difficulty. On the other hand, during long-term use, there is relative movement between the product shaft 200 and the abutting surface 14. The right-angle edge may be worn due to friction, resulting in inaccurate positioning or loosening, affecting the fixing accuracy of the product shaft 200. Therefore, the rounded-corner design can reduce friction, lower the wear rate, make the clamping more stable, and maintain long-term fixing accuracy.

[0054] In one embodiment, the insertion cavity 21 forms multiple pairs of insertion areas 24 around the insertion post 13, and each pair of insertion areas 24 is arranged oppositely; the insertion ends 201 are respectively formed with two insertion walls on both sides of the insertion groove 202, and the two insertion walls can respectively extend into a pair of insertion areas 24 through the open end.

[0055] Multiple pairs of insertion areas 24 are formed in the insertion cavity 21, and the two insertion walls can be inserted and matched with any one of the pairs of insertion areas 24. For example, if there are six, three pairs of insertion areas 24 in the insertion cavity 21, then there are three insertion directions for the insertion end 201, so that the insertion end 201 can be inserted into the insertion cavity 21 from more angles, and the insertion of the product shaft 200 and the detection shaft 100 is more convenient, improving the assembly efficiency.

[0056] In one embodiment, the insertion post 13 is a quadrangular prism, and the insertion cavity 21 forms two pairs of insertion areas 24 around the insertion post 13, and each insertion area 24 corresponds to an edge of the insertion post 13.

[0057] When the insertion post 13 is a quadrangular prism, it has two pairs of insertion areas 24. The total space in the insertion cavity 21 remains unchanged. The fewer the number of insertion areas 24, the larger the size of a single insertion area 24. Compared with the more insertion areas 24 of a prism with more edges, the four insertion areas 24 can take into account the insertion stability between the insertion post 13 and the product shaft 200 while meeting the insertion requirements at different angles, resulting in a greater contact pressure per unit area, improving the clamping stability and reducing the risk of slippage.

[0058] In an embodiment, the product shaft 200 is cylindrically arranged, and the surface of the limiting flange 2 facing the insertion post 13 is an arc surface. The limiting flange 2 encloses a cylindrical insertion cavity 21, and the shape of the insertion cavity 21 is adapted to the shape of the product shaft 200.

[0059] Specifically, the outer diameter of the product shaft 200 is 1.50 mm to 1.51 mm, and the inner diameter of the arc surface of the limiting protrusion 22 is 1.52 mm to 1.54 mm.

[0060] If the gap 23 between the arc surface and the outer wall of the product shaft 200 is too large, the product shaft 200 may swing in the insertion cavity 21, affecting the accuracy of torque detection. If the gap 23 is too small, the insertion force will increase, which may lead to difficult assembly or even damage to the product shaft 200. Therefore, by setting the arc surface of the limiting protrusion 22 and the outer diameter of the product shaft 200 according to the above dimensions, the maximum gap 23 between the two is 0.04 mm (1.54 mm - 1.50 mm), and the minimum gap 23 is 0.01 mm (1.52 mm - 1.51 mm), ensuring smooth insertion without looseness and improving the assembly accuracy.

[0061] The present invention also proposes a detection mechanism. The detection mechanism applies the above detection shaft 100, and the detection end 12 of the detection shaft 100 is used to fix the product shaft 200. The specific structure of the detection shaft 100 refers to the above embodiment. Since this detection mechanism adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0062] When detecting the torque of the motor, first insert the product shaft 200 of the motor into the insertion cavity 21, so that the limiting flange 2 abuts against the outer wall surface of the product shaft 200, and the insertion post 13 abuts against the wall 2021 of the insertion slot 202, thereby clamping the product shaft 200 from opposite sides. The shape of the insertion post 13 needs to form a surface contact with the wall 2021 of the insertion slot 202, so as to give the product shaft 200 a circumferential binding force. At the same time, the abutment of the insertion post 13 and the wall 2021 of the insertion slot 202 makes the product shaft 200 not rotate relative to the shaft body 1, thus realizing the fixation of the product shaft 200. Then start the motor, and the product shaft 200 drives the detection shaft 100 to rotate. The torque of the motor is detected by a torque detection device arranged on the detection shaft 100, such as a torque sensor.

[0063] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A detection shaft for assisting a product shaft in torque detection, characterized in that, One end of the product shaft forms a plug-in end, and a plug-in groove is provided in the plug-in end. The detection shaft includes: A shaft body, with an installation end and a detection end formed at both ends of the shaft body respectively. The detection end protrudes in a direction away from the installation end to form a plug-in column; A limiting flange, which protrudes from the outer peripheral edge of the detection end in a direction away from the installation end. The limiting flange surrounds the plug-in column and forms a plug-in cavity for the product shaft to be inserted with the plug-in column. The plug-in cavity is coaxially arranged with the plug-in column. One end of the plug-in cavity away from the detection end is open. The plug-in end can extend into the plug-in cavity through the opening, so that the plug-in column is inserted into the plug-in groove, and the limiting flange cooperates with the plug-in column to lock the plug-in end, so as to coaxially fix the product shaft and the detection shaft.

2. The detection shaft for assisting in torque detection of a product shaft according to claim 1, wherein The plug-in column is a prism, and one surface of the plug-in column away from the installation end is a polygonal abutting surface. At least one edge of the abutting surface abuts against the groove wall of the plug-in groove to cooperate with the limiting flange to lock the plug-in end.

3. The detection shaft for assisting in torque detection of a product shaft according to claim 2, wherein The plug-in column is a quadrangular prism, the abutting surface is quadrilateral, the plug-in groove includes two groove walls arranged at an angle, and the opposite two edges of the abutting surface respectively abut against the two groove walls of the plug-in groove.

4. The inspection shaft for assisting in torque inspection of the product shaft according to claim 3, characterized in that The abutting surface includes two relatively arranged first edges and two relatively arranged second edges. The two first edges respectively abut against the two groove walls of the plug-in groove, and the two second edges are arc-shaped.

5. The detection shaft for assisting in torque detection of a product shaft according to claim 3, wherein The limiting flange includes a plurality of spaced limiting protrusions, and a gap communicating with the plug-in cavity is formed between any two adjacent limiting protrusions. The two edges of the plug-in column that abut against the two groove walls of the plug-in groove respectively correspond to two of the gaps.

6. The inspection shaft for assisting in torque inspection of a product shaft according to claim 2, wherein All edges of the abutting surface are provided with rounded corners; and / or, the position of the limiting flange corresponding to the opening is provided with a rounded corner on the side facing the plug-in cavity.

7. The inspection shaft for assisting in torque inspection of a product shaft according to claim 1, characterized in that The plug-in groove includes two relatively arranged groove walls, and the two groove walls are used to abut against the surface of the plug-in column away from the installation end. Both groove walls are arranged at an angle with the axis of the product shaft, and the angle is 6° to 15°.

8. The detection shaft for assisting in torque detection of a product shaft according to claim 1, characterized in that, The plug-in cavity forms multiple pairs of plug-in areas around the plug-in column, and each pair of plug-in areas is relatively arranged; two plug-in walls are respectively formed on both sides of the plug-in end of the plug-in groove, and the two plug-in walls can selectively extend into a pair of plug-in areas through the opening.

9. The detection shaft for assisting in torque detection of the product shaft according to any one of claims 1 to 8, characterized in that, The product shaft is cylindrical, the surface of the limiting flange facing the plug-in column is an arc surface, and the limiting flange and the plug-in column enclose the cylindrical plug-in cavity, and the shape of the plug-in cavity is adapted to the shape of the product shaft.

10. A detection mechanism, characterized in that, The detection mechanism uses the detection shaft for torque detection of the auxiliary product shaft as described in any one of claims 1 to 9, and the detection end of the detection shaft is used to fix the product shaft.

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