Long cylinder side hole location degree detection tool

Abstract

The utility model provides a long cylinder side hole position accuracy detection tool, which comprises a base and a positioning detection mechanism arranged on the base, and is characterized in that the positioning detection mechanism comprises a positioning seat, a first reference positioning surface, a rotary supporting assembly, a central positioning assembly, a side hole positioning detection assembly, a fixing piece and a pre-positioning assembly; the positioning seat is connected to the base through the rotary supporting assembly and can drive a to-be-detected piece to rotate, the first reference positioning face is attached to the first end face of the to-be-detected piece to achieve axial positioning, the center positioning piece is matched with an inner hole of the to-be-detected piece to achieve radial positioning, and the side hole positioning detection assembly is arranged around the positioning seat. When a to-be-detected piece rotates, a side face reference hole and a detection hole of the to-be-detected piece are matched with the side hole positioning detection assembly to achieve position degree detection of a side hole, the long-cylinder-shaped to-be-detected piece is vertically placed to eliminate deformation errors, accurate position degree detection can be achieved through cooperation of all parts of the positioning detection mechanism, and the device is small in occupied space, convenient to operate and high in practicability. And the detection efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of testing tooling technology, specifically relating to a tooling for testing the position of side holes in a long cylindrical body. Background Technology

[0002] In the manufacturing of long cylindrical parts such as hydraulic cylinders and liquid storage tanks, the accuracy of the side hole position directly affects assembly performance. Traditional inspection methods generally adopt a horizontal placement scheme, which requires a large area of ​​inspection equipment, has high investment costs, and is unstable after the cylinder is placed, making it difficult to operate and resulting in low operating efficiency. In addition, the influence of the cylinder's own weight and the clamping force on the outer surface can cause the reference positioning to fail, resulting in large inspection errors. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a tooling for detecting the position of the side hole of a long cylindrical body, which can achieve accurate benchmark positioning and detection, ensure good detection accuracy, and at the same time, the device occupies a small area, is easy to operate, effectively reduces costs and improves efficiency.

[0004] To achieve the above and other related objectives, this utility model provides a fixture for detecting the position of side holes in a long cylindrical body, comprising:

[0005] Base;

[0006] A positioning detection mechanism is disposed on the base, and the positioning detection mechanism includes:

[0007] A positioning seat, which is rotatably connected to the base;

[0008] A first reference positioning surface is disposed on the positioning seat, and the end face of the part to be tested is in contact with the first reference positioning surface;

[0009] A central positioning component is disposed on the positioning seat and engages with the inner hole of the test piece to achieve radial positioning;

[0010] A fixing element is disposed above the positioning seat and presses against the second end face of the part to be tested;

[0011] A side hole positioning and detection component is disposed on the base and surrounds the positioning seat to locate and detect the position of the side hole of the test piece.

[0012] In an optional embodiment of this utility model, the positioning seat is rotatably connected to the base via a rotary support assembly.

[0013] In an optional embodiment of this utility model, the center positioning component includes:

[0014] The first positioning pin is inserted through the center of the positioning seat;

[0015] A central positioning component has a central hole, through which the first positioning pin passes. The central positioning component is coaxially arranged with the positioning seat via the first positioning pin. The circumferential direction of the central positioning component has an arc surface that mates with the inner hole of the test piece.

[0016] In an optional embodiment of this utility model, the central positioning member is a frustum-shaped structure, and the angle between its outer peripheral surface and the bottom surface near the positioning seat is an acute angle. The central positioning member and the positioning seat are connected by an elastic member.

[0017] In an optional embodiment of this utility model, the elastic element is a spring.

[0018] In an optional embodiment of this utility model, the side hole positioning detection component includes a second positioning pin and a third detection pin. When the test piece is rotated until its first detection hole engages with the second positioning pin, the third detection pin performs positional detection on the second detection hole on the test piece.

[0019] In an optional embodiment of the present invention, the side hole positioning and detection assembly further includes at least one mounting bracket, the mounting bracket having a mounting hole, and the second positioning pin and the third detection pin passing through the mounting hole.

[0020] In an optional embodiment of the present invention, a pre-positioning component is further included. The pre-positioning component is disposed on the base and includes a pre-positioning plate disposed on one side of the test piece. The structure of the pre-positioning plate is adapted to the outer contour of the test piece.

[0021] In an optional embodiment of this utility model, the fixing member is installed on the top of the prepositioning component, and the fixing member presses against and acts on the second end face of the test piece to fix the test piece.

[0022] In an optional embodiment of this utility model, the second positioning pin and the third detection pin are tapered pins.

[0023] The technical advantages of this invention are as follows: the test piece is placed vertically in the positioning and detection mechanism, and the test piece is fixed by the bottom positioning seat and the top clamping clamp, which can realize the detection of long cylinders, eliminating detection errors caused by side clamping and gravity deformation. At the same time, the central positioning component and the first reference positioning plane are used to accurately position the inner hole and end face of the cylinder, improving the detection accuracy. The positioning seat and the base can rotate relative to each other, and the test piece can rotate freely horizontally 360° relative to the base. The side hole positioning and detection component is fixed to the base, which can easily and accurately locate the secondary reference hole on the side and easily realize the detection of the hole position. The central positioning component and the positioning seat are connected by a spring. The spring presses down to make the first reference positioning surface fit with the end face of the cylinder, and the fixing component is used to press and fix it at the top. The second reference positioning surface is used for side positioning, which is accurate and reliable. The device has a simple structure, small footprint, reduced manufacturing costs, and the test piece is easy to install and remove. The detection operation is convenient, and multiple holes can be detected in one clamping, which effectively improves the detection efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the working process of the long cylindrical body side hole position detection fixture in an optional embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the long cylindrical body side hole position detection tool in an optional embodiment of the present invention;

[0027] Figure 3 This is a partial structural schematic diagram of the long cylindrical body side hole position detection fixture in an optional embodiment of the present invention.

[0028] Label Explanation:

[0029] 100. Base; 200. Positioning and detection mechanism; 300. Component to be tested;

[0030] 210, Positioning seat; 220, First reference positioning surface; 230, Rotary support assembly; 240, Center positioning assembly; 250, Side hole positioning detection assembly; 260, Fixing member; 270, Pre-positioning assembly;

[0031] 241. First locating pin; 242. Center locating component; 243. Spring; 251. Mounting bracket; 252. Second locating pin; 253. Third detection pin; 271. Support frame; 272. Pre-positioning plate. Detailed Implementation

[0032] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] When inspecting the position of side holes in long cylindrical parts, the traditional horizontal placement method not only occupies a large space, but also causes elastic deformation of thin-walled parts due to clamping on the outer surface, resulting in measurement errors. The bending deformation of the cylinder due to its own weight can also cause the inner hole reference to fail, resulting in measurement errors. Inspecting side holes at different angles requires repeated clamping, which is time-consuming and inefficient.

[0035] Please see Figures 1 to 3This utility model proposes a fixture for detecting the position of a side hole in a long cylindrical body, including a base 100 and a positioning and detection mechanism 200. Handles are provided on both sides of the base 100 to facilitate stable handling of the device and avoid damage to structural components. The positioning and detection mechanism 200 is mounted on the base 100 and is used for positioning and detecting the workpiece 300 to be tested. The positioning and detection mechanism 200 includes a positioning seat 210, a first reference positioning surface 220, a rotary support assembly 230, a center positioning assembly 240, a side hole positioning and detection assembly 250, a fixing member 260, and a pre-positioning assembly 270. The positioning seat 210 is rotatably connected to the base 100 via the rotary support assembly 230. When the positioning seat 210 rotates relative to the base 100, it can drive the workpiece 300 to rotate circumferentially. The first reference positioning surface 220 is disposed on the positioning seat 210. The workpiece 300 is placed on the positioning seat 210, with its first end face abutting against the first reference positioning surface 220. The first end face is the bottom surface of the test piece 300; the center positioning component 240 is disposed at the center of the positioning seat 210 and is used to cooperate with the inner hole of the test piece 300 to achieve radial positioning; the side hole positioning detection component 250 is disposed on the base 100 and surrounds the positioning seat 210, and is used to position and detect the position of the side hole of the test piece 300; the fixing component 260 is disposed above the positioning seat 210 and is used to press the second end face of the test piece 300 to fix it, the second end face being the top surface of the test piece 300; the pre-positioning component 270 can pre-position the test piece 300 to facilitate the placement of the long cylindrical body.

[0036] In the positioning and testing mechanism 200, the cylindrical test piece 300 is placed vertically, which can effectively eliminate the influence of gravity deformation on the testing. Its bottom is positioned axially and radially through the first reference positioning surface 220 and the central positioning component 242. It is fixed by the top fixing component 260. The test piece 300 can rotate relative to the base 100 with the positioning seat 210, which makes it easy to accurately match the side hole of the test piece 300 with the side hole positioning and testing component 250 and perform positional testing. The testing of multiple holes does not require repeated clamping, which greatly improves accuracy and efficiency. The overall structure of the testing fixture is simple and occupies a small area, which effectively reduces manufacturing costs.

[0037] Please see Figures 1 to 3 In an optional embodiment of this utility model, a plurality of first positioning blocks are evenly arranged circumferentially on the positioning base 210. The first reference positioning surface 220 is the top surface of the first positioning block. Axial positioning is achieved by the first reference positioning surface 220 fitting against the first end face of the test piece 300, and it is easy to replace. It is understood that the first reference positioning surface 220 is a plane. In other embodiments, the first reference positioning surface 220 can also be set on an annular positioning block, etc., and its setting method is not limited.

[0038] Please see Figures 1 to 3In an optional embodiment of this utility model, the positioning seat 210 is connected to the base 100 via a rotary support assembly 230, allowing it to rotate relative to the base 100, thereby driving the test piece 300 to rotate for rapid positioning and detection of the side hole. Specifically, the rotary support assembly 230 includes a planar bearing, the outer ring of which is fixed to the base 100, and the inner ring of which is connected to the positioning seat 210. The planar bearing, while bearing axial pressure, allows for easy rotation of the positioning seat 210, thus enabling the rotation of the test piece 300. It is understood that in other embodiments, the rotary support assembly 230 may also employ a combination of a slewing bearing and a rotating platform, connected by bolts. The slewing bearing enables high-torque rotation, and the connection method between the positioning seat 210 and the base 100 is unrestricted, as long as it supports and allows rotation of the positioning seat 210.

[0039] Please see Figures 1 to 3 In an optional embodiment of this utility model, a center positioning component 240 is disposed on a positioning base 210 and engages with the inner hole of the test piece 300 to achieve radial positioning. The center positioning component 240 includes a first positioning pin 241 and a center positioning element 242. The first positioning pin 241 passes through the center of the positioning base 210, and the center positioning element 242 has a center hole through which the first positioning pin 241 passes. The center positioning element 242 is coaxially arranged with the positioning base 210 and the plane bearing via the first positioning pin 241, ensuring that the rotation center coincides with the inner hole reference axis and eliminating positioning errors caused by centrifugal offset. A curved surface is provided circumferentially on the center positioning element 242 to engage with the inner hole of the test piece 300, and radial positioning is achieved by utilizing the engagement of the curved surface with the inner hole of the test piece 300.

[0040] Please see Figures 1 to 3 In an optional embodiment of this utility model, the central positioning member 242 is a frustum-shaped structure, and the angle between its outer peripheral surface and the bottom surface near the positioning seat 210 is an acute angle. The central positioning member 242 and the positioning seat 210 are connected by an elastic member. Specifically, the center positioning component 242 includes three claws evenly distributed circumferentially. The end face of each claw is an arc surface, and the angle between the generatrix of the arc surface and the bottom surface is an acute angle. It can be understood that the maximum diameter of the center positioning component 242 is larger than the inner diameter of the test piece 300, and the minimum diameter is smaller than the inner diameter of the test piece 300. When the test piece 300 is placed on the positioning seat 210, the center positioning component 242 can enter its inner hole and make contact with the inner hole line of the test piece 300 at an appropriate position on the arc surface. After the center positioning component 242 is engaged with the inner hole of the test piece 300, it can move axially under the action of the elastic element, so that the first end face of the test piece 300 can fit with the first reference positioning surface 220. Then, the fixing component 260 is used to press and fix it to achieve axial positioning. The elastic element can be, for example, a spring 243, which facilitates adjustment and realization of the axial movement of the center positioning component 242, making the positioning accurate and the operation convenient.

[0041] It should be noted that the structure of the central positioning element 242 is not limited. In other embodiments, the central positioning element 242 may be, for example, an annular frustum or multiple evenly distributed claws, as long as its circumferential surface can cooperate with the test piece 300 to achieve positioning.

[0042] Please see Figures 1 to 3 In an optional embodiment of this utility model, the side hole positioning and detection component 250 includes at least one mounting bracket 251, a second positioning pin 252, and a third detection pin 253. The mounting bracket 251 is provided with a mounting hole, and the second positioning pin 252 and the third detection pin 253 pass through the mounting hole for operation, enabling positioning and detection of the side hole of the elongated cylinder. When the test piece 300 is rotated until its first detection hole mates with the second positioning pin 252, the third detection pin 253 automatically aligns, enabling positional detection of the second detection hole on the test piece 300. If the detection pin can be fully inserted, the positional accuracy is qualified; otherwise, there is a deviation. Understandably, during the positional inspection of the side holes in the cylinder, the dual pins work together to integrate reference transfer and inspection. The reference hole and the inspection hole are relative; one of the first inspection hole and the second part's inspection hole is the reference hole, and the other is the inspection hole. First, the reference hole is positioned by rotating the cylinder to engage with the second positioning pin 252. Then, the positional inspection of the hole is achieved by checking the fit between the inspection hole and the third inspection pin 253. It should be noted that the number and positional distribution of the positioning pins and inspection pins are not limited. Different settings can be used depending on the structure of the part under test 300. For example, when the part under test 300 needs to have the positional inspection of multiple side holes, multiple sets of positioning pins and inspection pins can be used to achieve the inspection, which is convenient to operate and has high inspection efficiency.

[0043] Please see Figures 1 to 3 In an optional embodiment of this utility model, the positioning pin and the detection pin can be respectively set on different mounting brackets 251. The mounting bracket 251 can be configured as a height-adjustable structure and detachably connected to the base 100. By changing the installation position of the mounting bracket 251 on the base 100 and the height of the mounting bracket 251, it can adapt to the side hole detection requirements of different heights and angles. Thus, when detecting multiple side holes, only one installation is needed. By adjusting the mounting bracket 251 and combining it with the rotation of the test piece 300, multiple sets of positioning and detection can be achieved. The overall structure of the detection fixture is simpler, easier to operate, and has higher work efficiency. The structure of the detection fixture can be flexibly adjusted as needed, resulting in better adaptability.

[0044] Please see Figures 1 to 3In one optional embodiment of this utility model, the second positioning pin 252 and the third detection pin 253 are tapered pins, which achieve self-locking positioning by contacting the hole wall with the tapered surface, providing better positioning accuracy and stability in the detection of cylindrical structures. In other embodiments, cylindrical pins or the like can also be used.

[0045] Please see Figures 1 to 3 In an optional embodiment of this utility model, the pre-positioning component 270 is disposed on the base 100 to facilitate the placement and fixation of the workpiece 300 to be tested. The pre-positioning component 270 includes a support frame 271 and a pre-positioning plate 272. The pre-positioning plate 272 is disposed on one side of the workpiece 300, and its structure is adapted to the outer contour of the workpiece 300. Specifically, an arc-shaped surface that semi-encircles the workpiece 300 is formed on the pre-positioning plate 272. When placing the workpiece, the outer contour of the workpiece 300 can be initially aligned with the arc-shaped surface, which facilitates the docking of the inner hole with the center positioning component 242 and the installation of the workpiece 300. Second positioning blocks are provided at both ends of the arc. The end face of the second positioning block is in close contact with the workpiece 300 with a small clearance, which can position the workpiece 300 without affecting its axial movement and prevent displacement or tipping, thus facilitating operation.

[0046] Please see Figures 1 to 3 In an optional embodiment of this utility model, the fixing member 260 is installed on the top of the pre-positioning component 270, pressing and acting on the second end face, i.e., the top face, of the test piece 300 for fixation. The fixing member 260 can be, for example, a quick-release clamp. When the clamp is pressed, the clamp head acts vertically on the top face of the test piece 300 to fix it. After pressing down the long cylindrical body so that its lower end face is in contact with the first reference positioning surface 220, it is fixed using the clamp, ensuring accurate positioning and overall installation stability. After the clamp is released, the test piece 300 can be easily removed, making the operation quick and easy. It is understood that the installation method of the clamp is not limited; it can be installed on the pre-positioning component 270 via a bracket, or directly on the base 100 via a bracket. The bracket can also be set as an adjustable bracket, which can be adjusted to accommodate measurements of test pieces 300 of different heights.

[0047] Please see Figures 1 to 3In an optional embodiment of this utility model, during operation, the long cylindrical test piece 300 is placed above the positioning seat 210 and roughly centered by the pre-positioning plate 272. The arc surface on the center positioning piece 242 contacts and engages with the inner hole of the cylinder to achieve center positioning. Then, it is pressed down, and under the action of the spring 243, the cylinder and the center positioning piece 242 move axially until the bottom end face of the cylinder is in contact with the first reference positioning surface 220. By rotating the positioning seat 210, the test piece 300 can be rotated to engage with the reference hole on the side of the cylinder and the second positioning pin 252. The test piece 300 is clamped and fixed by the clamping clamp. The third detection pin 253 is inserted into the detection hole for detection. Only one clamping is required. The rotation of the positioning seat 210 can easily achieve the positioning and detection of the side hole. The operation is convenient and the detection efficiency is high. After the detection is completed, the clamping clamp is opened and the test piece 300 can be easily taken out.

[0048] In summary, the long cylindrical body side hole position detection fixture of this utility model can realize the position detection of the side hole of the long cylindrical body. The vertical positioning eliminates the influence of gravity deformation and can accurately locate the main positioning hole, i.e., the inner hole of the cylinder. It is easy to handle and occupies a small area. The central positioning component 242 performs central positioning and uses the spring 243 to achieve axial positioning. It is fixed by combining with the clamp. The pre-positioning plate 272 pre-positions to facilitate installation and ensure stability, which can achieve accurate positioning and side hole position detection. The long cylindrical body can be rotated freely in the horizontal direction for 360°, which can easily and accurately locate the secondary reference hole. The rotation detection can realize multi-angle rapid switching, which is convenient to operate and has high detection efficiency. The overall structure of the detection fixture is simple, the manufacturing cost is low, and it is highly flexible and can be adjusted according to the detection needs, making it highly adaptable.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0050] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0051] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0052] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0053] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0054] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0055] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0056] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0057] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A fixture for detecting the position of side holes in a long cylindrical body, characterized in that, include: Base; A positioning detection mechanism is disposed on the base, and the positioning detection mechanism includes: A positioning seat, which is rotatably connected to the base; A first reference positioning surface is disposed on the positioning seat, and the first end face of the test piece is in contact with the first reference positioning surface. A central positioning component is disposed on the positioning seat and engages with the inner hole of the test piece to achieve radial positioning; A fixing element is disposed above the positioning seat and presses against the second end face of the part to be tested; A side hole positioning and detection component is disposed on the base and surrounds the positioning seat to locate and detect the position of the side hole of the test piece.

2. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 1, characterized in that, The positioning seat is rotatably connected to the base via a rotary support assembly.

3. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 2, characterized in that, The central positioning component includes: The first positioning pin is inserted through the center of the positioning seat; A central positioning component has a central hole, through which the first positioning pin passes. The central positioning component is coaxially arranged with the positioning seat via the first positioning pin. The circumferential direction of the central positioning component has an arc surface that mates with the inner hole of the test piece.

4. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 3, characterized in that, The central positioning component is a frustum-shaped structure, and the angle between its outer peripheral surface and the bottom surface near the positioning seat is an acute angle. The central positioning component and the positioning seat are connected by an elastic element.

5. The fixture for detecting the position of the side holes of a long cylindrical body according to claim 4, characterized in that, The elastic element is a spring.

6. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 3, characterized in that, The side hole positioning and detection assembly includes a second positioning pin and a third detection pin. When the test piece is rotated until its first detection hole engages with the second positioning pin, the third detection pin performs positional detection on the second detection hole on the test piece.

7. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 6, characterized in that, The side hole positioning and detection assembly further includes at least one mounting bracket, which has a mounting hole, and the second positioning pin and the third detection pin pass through the mounting hole.

8. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 1, characterized in that, It also includes a pre-positioning component, which is disposed on the base and includes a pre-positioning plate disposed on one side of the test piece, the structure of which is adapted to the outer contour of the test piece.

9. The fixture for detecting the position of the side hole of the long cylindrical body according to claim 8, characterized in that, The fastener is installed on the top of the prepositioning assembly, and the fastener presses against and acts on the second end face of the test piece to fix the test piece.

10. The fixture for detecting the position of the side holes of a long cylindrical body according to claim 6, characterized in that, The second positioning pin and the third detection pin are tapered pins.

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