Coaxiality testing fixture

Abstract

The invention relates to a coaxiality gauge, which is used for measuring the hole location tolerance of a to-be-measured hole of a to-be-measured workpiece, and comprises a detection seat provided with a standard hole, the detection seat is provided with a positioning mechanism, and the positioning mechanism is used for positioning the to-be-measured workpiece placed on the detection seat; the positioning seat is provided with a conical surface part, the positioning seat is used for being arranged at an orifice of a to-be-detected hole through the conical surface part, a first through hole is formed in the positioning seat, and the hole center line of the first through hole is parallel to the hole center line of the standard hole; the positioning column is arranged in the first through hole in a penetrating mode, the positioning column is provided with a positioning end extending out of the first through hole, the positioning end is used for abutting against the hole end face, facing the positioning base, of the standard hole, a second through hole is formed in the positioning column, and the hole center line of the second through hole and the hole center line of the first through hole are coaxially arranged; the second through hole is used for being opposite to the standard hole; and the detection piece is used for measuring the coaxiality of the second through hole and the standard hole.

Description

Technical Field

[0001] The present application relates to the technical field of detection tools, and in particular to a coaxiality inspection tool. Background Art

[0002] As people's living standards continue to improve, higher requirements are placed on the quality and performance of automobiles. Stepped holes are generally designed and processed on parts such as door glass and rear windshield wipers in automobiles to meet installation needs. A stepped hole can be understood as two holes with different apertures but coaxially arranged and interconnected. The two holes of the stepped hole need to meet the aperture tolerance and hole position tolerance (i.e. coaxiality tolerance) requirements.

[0003] At present, the measuring tool used for step hole position tolerance detection is the stop pin, which is designed and processed according to the aperture tolerance and hole position tolerance of the step hole. During measurement, the small diameter section of the stop pin is passed through the first hole with a larger aperture and then inserted into the second hole with a smaller aperture. If the large diameter section of the stop pin can also be inserted into the second hole, it can be determined that the hole position tolerance of the step hole meets the requirements. But in fact, if the aperture tolerance of the two holes reaches the upper difference, although the stop pin can still be inserted into the first hole and the second hole normally, at this time, due to the offset relationship between the first hole and the second hole, the hole position tolerance has exceeded the specified value, and the step hole is an unqualified hole. In other words, the traditional stop pin cannot eliminate the influence of the aperture tolerance on the hole position tolerance measurement, resulting in inaccurate measurement results and causing the workpiece quality to fail to meet the requirements. Summary of the invention

[0004] Based on this, it is necessary to provide a coaxiality inspection fixture to address the problem of being unable to eliminate the influence of hole diameter tolerance on hole position tolerance measurement accuracy.

[0005] The present application provides a coaxiality inspection tool for measuring the hole position tolerance of a hole to be measured of a workpiece to be measured, and the coaxiality inspection tool comprises:

[0006] A detection seat, wherein the detection seat is provided with a standard hole, and a positioning mechanism is provided on the detection seat, and the positioning mechanism is used to position the workpiece to be tested placed on the detection seat;

[0007] A positioning seat, wherein the positioning seat is provided with a conical surface portion, the positioning seat is used to be installed at the opening of the hole to be measured through the conical surface portion, and a first through hole is opened inside the positioning seat;

[0008] A positioning post, the positioning post is inserted into the first through hole, the positioning post has a positioning end extending out of the first through hole, the positioning end is used to abut against the hole end surface of the standard hole facing the positioning seat, so that the hole center line of the first through hole is parallel to the hole center line of the standard hole, a second through hole is opened inside the positioning post, the hole center line of the second through hole is coaxially arranged with the hole center line of the first through hole, and the second through hole is used to be arranged opposite to the standard hole; and

[0009] A detection piece is used to measure the coaxiality between the second through hole and the standard hole.

[0010] The coaxiality inspection tool of the present scheme is specifically composed of a detection body composed of a positioning seat and a positioning column that are connected and matched, and the detection seat serves as a detection carrier. When in use, the workpiece to be measured is first placed on the detection seat and positioned by a positioning mechanism, and then the positioning seat is placed at the hole to be measured of the workpiece to be measured. Specifically, the positioning seat is positioned at the hole mouth of the hole to be measured by means of a conical surface. With the help of the structural characteristics of the conical surface and relying on the deadweight of the detection body, the positioning seat can achieve a self-centering effect at the hole to be measured, so as to realize the coaxial arrangement of the hole to be measured, the positioning seat, and the first through hole; then, the positioning end of the positioning column penetrating the first through hole is abutted against the hole end face of the positioning seat facing the standard hole, so that the hole center line of the first through hole is parallel to the hole center line of the standard hole, and because the hole center line of the second through hole is parallel to the hole center line of the first through hole The center lines are coaxially arranged, thereby ensuring that the center line of the second through hole formed inside the first positioning column is parallel to and coaxial with the center line of the standard hole, and because the second through hole, the positioning column and the positioning seat are also coaxially arranged, it is ensured that the second through hole is coaxially arranged with the hole to be measured. On this basis, the coaxiality of the second through hole and the standard hole is measured by a detection component. If the measurement shows that the second through hole and the standard hole are coaxially arranged, it means that the standard hole is also coaxially arranged with the hole to be measured, and the coaxiality tolerance of the hole to be measured and the standard hole is qualified and meets the design requirements. If the measurement shows that the second through hole and the standard hole are not coaxially arranged, it means that the standard hole and the hole to be measured are also non-coaxially arranged, then the coaxiality tolerance of the hole to be measured and the standard hole is unqualified and does not meet the design requirements. Compared with traditional technology, this solution, with the help of the positioning function of the positioning seat and the positioning column, has a good centering effect on the hole center of the measured hole and the hole center of the standard hole, thereby effectively eliminating the influence of the hole diameter tolerance on the hole position tolerance measurement, ensuring the accuracy of the coaxiality tolerance measurement results, and ensuring that the workpiece quality meets the use requirements.

[0011] The technical solution of this application is further described below:

[0012] In one embodiment, the detection member is a latch, which is movably inserted into the second through hole. When the latch is coaxial with the standard hole, the latch can extend out of the end of the second through hole and be inserted into the standard hole.

[0013] In one embodiment, the diameter of the pin is set to D1, and the diameter of the standard hole is set to D2; wherein the hole position tolerance of the hole to be measured is less than or equal to D2-D1.

[0014] In one embodiment, the detection component includes a light emitter and a light receiver, one of the light emitter and the light receiver is disposed in the second through hole, and the other of the light emitter and the light receiver is used to be installed in a standard hole. When the second through hole is coaxial with the standard hole or the light emitter and the light receiver are aligned, the detection light emitted by the light emitter cannot be received by the light receiver.

[0015] In one of the embodiments, a light receiving portion of the light receiver is provided with a light shielding member, a diameter of the light shielding member is set to a hole position tolerance of the hole to be measured, and the light shielding member is used to shield the detection light emitted by the light emitter.

[0016] In one embodiment, the outer peripheral wall of the light emitter or the light receiver installed in the second through hole is provided with an external thread, and the hole wall of the second through hole is provided with an internal thread, and the external thread is threadedly connected with the internal thread.

[0017] In one embodiment, the positioning post is axially movably disposed in the first through hole.

[0018] In one of the embodiments, the positioning column is further provided with a stop step, the stop step is arranged opposite to the positioning seat, and the stop step is used to abut against the end surface of the positioning seat for positioning.

[0019] In one embodiment, the coaxiality inspection fixture further includes an end plate, and the positioning column is further provided with a connecting end, the connecting end and the positioning end are respectively two opposite axial ends of the positioning column, and the end plate is connected to the connecting end.

[0020] In one embodiment, the end plate is provided with a threaded hole, the connection end is provided with a stud, and the stud is screwed into the threaded hole.

[0021] In one embodiment, the positioning seat includes a coaxially connected cone and a cylinder, the conical surface of the cone is the conical surface portion, and the coaxiality gauge also includes an elastic member, one end of the elastic member abuts against the cone, and the other end of the elastic member abuts against the end plate.

[0022] In one embodiment, the elastic member is configured as a spring, and the spring is sleeved on the outside of the cylinder.

[0023] In one of the embodiments, a chamfered surface is formed on a side wall of the hole to be measured away from the standard hole, and the conical surface portion is used to abut against the annular surface of the chamfered surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of the structure of setting a stepped hole on the glass of one embodiment.

[0027] Figure 2 Schematic diagram of the structure of the coaxiality inspection fixture installed in the stepped hole of the glass.

[0028] Figure 3 The figure is a schematic diagram of the installation structure of a mechanical working principle gauge according to an embodiment.

[0029] Figure 4 This is a schematic diagram of the structure of a mechanical working principle gauge for coaxiality tolerance measurement.

[0030] Figure 5 This is a schematic diagram of the structure of a gauge based on an electronic working principle for measuring coaxiality tolerance.

[0031] Description of reference numerals:

[0032] 100, coaxiality inspection fixture; 10, positioning seat; 11, conical surface; 12, first through hole; 13, cone; 14, cylinder; 15, positioning mechanism; 20, positioning column; 21, positioning end; 22, second through hole; 23, stop step; 24, connecting end; 30, detection member; 30a, latch; 30b, light transmitter; 30c, light receiver; 31c, shading member; 40, end plate; 50, elastic member; 60, detection seat; 61, standard hole; 200, glass; 210, hole to be measured; 211, chamfered surface. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specified and limited.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] See also Figures 1 to 5 , is a schematic diagram of a coaxiality inspection fixture 100 and a workpiece to be tested assembled to measure the hole position tolerance of a hole to be tested on the workpiece to be tested, as shown in one embodiment of the present application. According to actual needs, the workpiece to be tested mentioned in this article can be glass 200 used in automobiles (such as door and window glass, etc.), a transmission bracket, etc.

[0038] This article takes the workpiece to be measured as glass 200 as an example for description.

[0039] The glass 200 is designed with a test hole 210 to facilitate the installation of glass accessories, such as glue nails and the like.

[0040] Exemplarily, the coaxiality inspection fixture 100 includes a positioning seat 10 , a positioning column 20 , a detection member 30 and a detection seat 60 .

[0041] The detection seat 60 is provided with a standard hole 61 , and a positioning mechanism 15 is provided on the detection seat 60 . The positioning mechanism 15 is used to position the glass 200 placed on the detection seat 60 .

[0042] For example, the positioning mechanism 15 includes an X-axis positioning component, a Y-axis positioning component and a Z-axis positioning component, which can respectively position the glass 200 in three directions, namely, X, Y and Z, to ensure that the glass 200 does not shift or loosen during the detection process, thereby improving the accuracy of the detection result.

[0043] The positioning seat 10 is provided with a conical surface portion 11 . The positioning seat 10 is used to be installed at the opening of the hole to be measured 210 through the conical surface portion 11 . A first through hole 12 is opened inside the positioning seat 10 .

[0044] The positioning column 20 is inserted into the first through hole 12 and has a positioning end 21 extending out of the first through hole 12. The positioning end 21 is used to abut against the end surface of the standard hole 61 facing the positioning seat 10, so that the center line of the first through hole 12 is parallel to the center line of the standard hole 61.

[0045] A second through hole 22 is opened inside the positioning column 20, and the center line of the second through hole 22 is coaxially arranged with the center line of the first through hole 12. The second through hole 22 is used to be arranged opposite to the standard hole 61, that is, one end of the second through hole 22 is opposite to one end of the standard hole 61.

[0046] The detection member 30 is used to measure the coaxiality between the second through hole 22 and the standard hole 61 .

[0047] It is easy to understand that when the hole position tolerance of the hole to be measured 210 meets the design requirements, the first through hole 12 and the positioning seat 10 are coaxially arranged.

[0048] In summary, the implementation of the technical solution of this embodiment will achieve the following beneficial effects: the coaxiality gauge 100 of this solution is specifically composed of a detection body composed of a positioning seat 10 and a positioning column 20 that are connected and matched, and the detection seat 60 serves as a detection carrier; when in use, the glass 200 to be measured is first placed on the detection seat 60 and positioned by the positioning mechanism 15, and then the positioning seat 10 is placed at the hole 210 to be measured of the glass 200, and the positioning seat 10 is specifically positioned at the hole 210 to be measured by the conical surface portion 11. With the help of the structural characteristics of the conical surface portion 11 and relying on the deadweight of the gauge body, the positioning seat 10 can achieve a self-centering effect at the hole 210 to be measured, so as to achieve a coaxial arrangement of the hole 210 to be measured, the positioning seat 10, and the first through hole 12.

[0049] Afterwards, the positioning end 21 of the positioning column 20 that passes through the first through hole 12 is abutted against the hole end surface of the standard hole 61 facing the positioning seat 10, so that the hole center line of the first through hole 12 is parallel to the hole center line of the standard hole 61, and because the hole center line of the second through hole 22 is coaxially arranged with the hole center line of the first through hole 12, it can be ensured that the hole center line of the second through hole 22 formed inside the first positioning column 20 is parallel to the hole center line of the standard hole 61, and because the second through hole 22, the positioning column 20 and the positioning seat 10 are also coaxially arranged, it is also ensured that the second through hole 22 is parallel to the hole to be measured. 210 is coaxially arranged. On this basis, the coaxiality of the second through hole 22 and the standard hole 61 is measured by using the detection piece 30. If the measurement shows that the second through hole 22 and the standard hole 61 are coaxially arranged, it means that the standard hole 61 is also coaxially arranged with the hole to be measured 210, and the coaxiality tolerance of the hole to be measured 210 and the standard hole 61 is qualified and meets the design requirements. If the measurement shows that the second through hole 22 and the standard hole 61 are non-coaxially arranged, it means that the standard hole 61 and the hole to be measured 210 are also non-coaxially arranged, then the coaxiality tolerance of the hole to be measured 210 and the standard hole 61 is unqualified and does not meet the design requirements.

[0050] Compared with traditional technology, this solution has a good centering effect on the hole center of the measured hole 210 and the hole center of the standard hole 61 with the help of the positioning function of the positioning seat 10 and the positioning column 20, thereby effectively eliminating the influence of the aperture tolerance on the hole position tolerance measurement, and can ensure the accuracy of the coaxiality tolerance measurement results, ensuring that the workpiece quality meets the use requirements.

[0051] On the basis of the above embodiment, the side wall of the hole 210 to be tested away from the standard hole 61 is formed with a chamfered surface 211, and the conical surface 11 is used to abut against the annular surface of the chamfered surface 211. This effectively increases the contact support area between the glass 200 and the positioning seat 10, which helps to improve the stability of the installation of the inspection tool (which is the abbreviation of the coaxiality inspection tool 100, the same above and below) on the glass 200.

[0052] In the present application, the detection member 30 specifically has two measurement working modes, namely mechanical and electronic.

[0053] Please continue reading Figure 3 and Figure 4 When the gauge performs the measurement in a mechanical manner, in an optional embodiment, the detection member 30 is a pin 30a. The pin 30a is specifically a slender cylindrical rod, and its outer peripheral surface has a high straightness, so that the outer peripheral surface is parallel to the axis of the pin 30a, which is conducive to ensuring the accuracy of the coaxiality tolerance measurement result.

[0054] The latch pin 30 a is movably disposed in the second through hole 22 . When the latch pin 30 a is coaxial with the standard hole 61 , the latch pin 30 a can extend out of the end of the second through hole 22 and be inserted into the standard hole 61 .

[0055] Specifically, the latch pin 30 a can be telescopically movable along the center line direction of the second through hole 22 .

[0056] In the initial state, the pin 30a can be only installed in the second through hole 22 but the end does not extend out of the second through hole 22, or the pin 30a is not assembled with the positioning column 20. Only when the positioning seat 10 is placed at the hole 210 to be tested on the glass 200, the pin 30a is then inserted into the second through hole 22.

[0057] During measurement, if the pin 30a extends out of the end of the second through hole 22 and can be normally inserted into the standard hole 61, it means that the second through hole 22 is coaxially arranged with the standard hole 61, and the coaxiality tolerance of the standard hole 61 and the hole to be measured 210 is qualified.

[0058] The end of the pin 30a extending out of the second through hole 22 cannot be inserted into the standard hole 61, indicating that the second through hole 22 and the standard hole 61 are not coaxially arranged, and the coaxiality tolerance between the standard hole 61 and the hole to be measured 210 is unqualified.

[0059] This measurement method and principle are simple, highly feasible, and highly accurate. Moreover, by visually measuring the insertion depth (or length) of the pin 30a, even if the glass 200 blocks the line of sight, the measurement operation can be performed normally in a blind situation, and the implementation flexibility is high.

[0060] In order to enable the latch pin 30a to effectively slide axially in the second through hole 22 without completely slipping out of the second through hole 22, the outer peripheral wall of the latch pin 30a is loosely matched with the hole wall of the second through hole 22. In other words, it can be considered that the diameter of the latch pin 30a is close to the hole diameter of the second through hole 22.

[0061] If the end of the plug 30a extending out of the second through hole 22 can be normally inserted into the standard hole 61 to a preset depth, it indicates that the coaxiality tolerance of the hole 210 to be measured and the standard hole 61 is qualified, and at this time, the coaxiality tolerance can be calculated according to the quantitative relationship between the diameter of the plug 30a and the aperture of the standard hole 61. Specifically, in one embodiment, the diameter of the plug 30a is set to D1, and the aperture of the standard hole 61 is set to D2; wherein, when the plug 30a can be inserted into the standard hole 61, the hole position tolerance of the hole 210 to be measured is less than or equal to D2-D1.

[0062] Please continue reading Figure 5Alternatively, the detection member 30 may also perform the measurement work electronically. For example, in an optional embodiment, the detection member 30 includes a light emitter 30b and a light receiver 30c. One of the light emitter 30b and the light receiver 30c is disposed in the second through hole 22, and the other of the light emitter 30b and the light receiver 30c is used to be installed in the standard hole 61. When the second through hole 22 is coaxial with the standard hole 61 or the light emitter 30b and the light receiver 30c are aligned, the detection light emitted by the light emitter 30b cannot be received by the light receiver 30c.

[0063] Furthermore, a light receiving portion of the light receiver 30c is provided with a shading member 31c, the diameter of the shading member 31c is set to the hole position tolerance of the hole to be measured 210, and the shading member 31c is used to shield the detection light emitted by the light emitter 30b.

[0064] Specifically in the present application, the light transmitter 30b is a laser transmitter, and the light receiver 30c is a laser receiver. The laser receiver is installed in the second through hole 22, and the laser transmitter is installed in the standard hole 61. For example, the laser receiver can be installed and positioned in the second through hole 22 by at least one of interference fit, snap fit, magnetic connection, bonding, etc.; the laser transmitter can be installed and positioned in the standard hole 61 by at least one of interference fit, snap fit, magnetic connection, bonding, etc.

[0065] When the laser transmitter is started, it will transmit a laser line to the laser receiver. Since the diameter of the shading member 31c is set to the hole position tolerance of the hole to be measured 210, if the laser receiver receives the laser line normally, it indicates that there is an axial offset between the standard hole 61 and the second through hole 22, and the actual coaxiality tolerance of the hole to be measured 210 and the standard hole 61 is out of tolerance and does not meet the regulations; on the contrary, if the laser receiver cannot receive the laser line, it indicates that the laser line is completely blocked by the shading member 31c, the laser transmitter and the laser receiver are accurately aligned, the second through hole 22 is parallel to the center line of the standard hole 61, and the coaxiality tolerance of the hole to be measured 210 and the standard hole 61 meets the regulations and requirements.

[0066] In order to facilitate installation and disassembly, and to improve the strength and stability during installation and use, in an optional embodiment, the outer peripheral wall of the light emitter 30b or the light receiver 30c installed in the second through hole 22 is provided with an external thread, and the hole wall of the second through hole 22 is provided with an internal thread, and the external thread is screwed to the internal thread.

[0067] For example, in the present application, the light receiver 30 c is detachably fixed in the second through hole 22 by means of threaded installation.

[0068] Of course, in other optional implementations, the light receiver 30c can also be detachably installed in the second through hole 22 by any of the methods such as snap-on, adhesive, magnetic connection, etc., or can be fixed integrally in the second through hole 22 by a non-detachable installation method, which can be flexibly selected according to actual needs.

[0069] In addition, on the basis of any of the above embodiments, the positioning post 20 can be axially movably inserted into the first through hole 12. If the length of the positioning end 21 of the positioning post 20 extending out of the first through hole 12 is too large, it is easy to cause the positioning end 21 to interfere with the end face of the standard hole 61 when the gauge is placed at the hole 210 to be measured of the glass 200, causing the positioning seat 10 to be unable to be effectively and stably placed at the opening of the hole 210 to be measured; while the positioning post 20 is axially movable in the first through hole 12, so that the positioning post 20 is initially kept in the recovery position, and during the process of placing the gauge in the hole 210 to be measured, the positioning end 21 is away from the end face of the standard hole 61 to form a safety distance, thereby avoiding the above interference problem; when the positioning seat 10 is placed at the opening of the hole 210 to be measured, the positioning post 20 is pushed to extend a certain length from the first through hole 12 until the end face of the positioning end 21 abuts against the end face of the standard hole 61.

[0070] In addition, the positioning column 20 is also provided with a stop step 23, which is arranged opposite to the positioning seat 10 and is used to abut against the end face of the positioning seat 10 for positioning. After the coaxiality tolerance measurement operation is completed, the positioning column 20 is pulled outward to separate the positioning end 21 from the end face of the standard hole 61, and the stop step 23 abuts against the end face of the positioning seat 10 to position the positioning column 20, so that the structure of the positioning seat 10 and the positioning column 20 in the retracted state is more stable and compact.

[0071] The stop step 23 is an annular structure and can abut against the end face annular surface of the positioning seat 10, so that the abutting force is more uniform.

[0072] In another embodiment, the coaxiality gauge 100 further includes an end plate 40, and the positioning column 20 is further provided with a connecting end 24, the connecting end 24 and the positioning end 21 are respectively two opposite axial ends of the positioning column 20, and the end plate 40 is connected to the connecting end 24. On the one hand, the end plate 40 has a larger surface area, which can provide a more ample pressing surface, so as to more effectively press the positioning column 20 to slide out in the first through hole 12, so that the end face of the positioning end 21 abuts against the end face of the standard hole 61; on the other hand, after the measurement operation is completed, the end plate 40 can be held by the operator, so as to more effectively pull the positioning column 20 out of the hole 210 to be measured.

[0073] According to actual needs, there can be multiple ways to connect the connection end 24 of the positioning column 20 and the end plate 40. For example, in one embodiment, the end plate 40 is provided with a threaded hole, and the connection end 24 is provided with a stud, which is screwed into the threaded hole. The threaded connection method has a simple structure, high connection strength, and labor-saving connection between the positioning column 20 and the end plate 40 during installation and removal. Alternatively, in other optional implementations, the connection end 24 of the positioning column 20 and the end plate 40 can also be assembled and fixed by any one of clamping, bonding, magnetic connection, etc.

[0074] Please continue reading Figure 3 and Figure 4 In one embodiment of the present application, the positioning seat 10 includes a coaxially connected cone 13 and a cylinder 14, the conical surface of the cone 13 is the conical surface 11, and the coaxiality inspection fixture 100 also includes an elastic member 50, one end of the elastic member 50 abuts against the cone 13, and the other end of the elastic member 50 abuts against the end plate 40. When the end plate 40 is pressed to extend the positioning column 20, the elastic member 50 is compressed by the end plate 40 to store energy; after completing the coaxiality tolerance measurement operation, the end plate 40 is released, and under the elastic force of the elastic member 50, the end plate 40 and the positioning column 20 can be automatically lifted up and separated from the inspection seat 60, reducing the manual operation steps, improving the degree of automation of the inspection fixture, and helping to improve the efficiency of the measurement operation.

[0075] For example, the elastic member 50 is set as a spring, and the spring is sleeved on the outside of the cylinder 14. The spring has excellent elasticity, is easy to install and use, and has low cost. The spring is sleeved on the outside of the cylinder 14, and the installation is firm. The cylinder 14 guides and limits the expansion and contraction of the spring.

[0076] Of course, in other optional embodiments, the elastic member 50 may also be any one of a spring sheet, an elastic column, a gas spring, etc.

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A coaxiality inspection tool for measuring the hole position tolerance of a workpiece to be tested, characterized in that: The coaxiality inspection tool comprises: A detection seat, wherein the detection seat is provided with a standard hole, and a positioning mechanism is provided on the detection seat, and the positioning mechanism is used to position the workpiece to be tested placed on the detection seat; A positioning seat, wherein the positioning seat is provided with a conical surface portion, the positioning seat is used to be installed at the opening of the hole to be measured through the conical surface portion, and a first through hole is opened inside the positioning seat; A positioning post, the positioning post is inserted into the first through hole, the positioning post has a positioning end extending out of the first through hole, the positioning end is used to abut against the hole end surface of the standard hole facing the positioning seat, so that the hole center line of the first through hole is parallel to the hole center line of the standard hole, a second through hole is opened inside the positioning post, the hole center line of the second through hole is coaxially arranged with the hole center line of the first through hole, and the second through hole is used to be arranged opposite to the standard hole; and A detection piece is used to measure the coaxiality between the second through hole and the standard hole.

2. The coaxiality inspection tool according to claim 1, characterized in that: The detection member adopts a latch, and the latch is movably arranged in the second through hole. When the latch is coaxial with the standard hole, the latch can extend out of the end of the second through hole and be inserted into the standard hole.

3. The coaxiality inspection tool according to claim 2, characterized in that: The diameter of the pin is set to D1, and the diameter of the standard hole is set to D2; wherein the hole position tolerance of the hole to be measured is less than or equal to D2-D1.

4. The coaxiality inspection tool according to claim 1, characterized in that: The detection component includes a light emitter and a light receiver, one of which is disposed in the second through hole, and the other of which is used to be installed in a standard hole. When the second through hole is coaxial with the standard hole or the light emitter is aligned with the light receiver, the detection light emitted by the light emitter cannot be received by the light receiver.

5. The coaxiality inspection tool according to claim 4, characterized in that: The light receiving part of the light receiver is provided with a shading member, the diameter of the shading member is set to the hole position tolerance of the hole to be measured, and the shading member is used to shield the detection light emitted by the light emitter.

6. The coaxiality inspection tool according to claim 4, characterized in that: The outer peripheral wall of the light emitter or the light receiver installed in the second through hole is provided with an external thread, and the hole wall of the second through hole is provided with an internal thread, and the external thread is threadedly connected with the internal thread.

7. The coaxiality inspection tool according to claim 1, characterized in that: The positioning post is axially movable and penetrates the first through hole.

8. The coaxiality inspection tool according to claim 1, characterized in that: The positioning column is further provided with a stop step, the stop step is arranged opposite to the positioning seat, and the stop step is used for abutting against the end surface of the positioning seat for positioning.

9. The coaxiality inspection tool according to claim 1, characterized in that: The coaxiality inspection tool further includes an end plate. The positioning column is further provided with a connecting end. The connecting end and the positioning end are respectively two opposite axial ends of the positioning column. The end plate is connected to the connecting end.

10. The coaxiality inspection tool according to claim 9, characterized in that: The end plate is provided with a threaded hole, and the connecting end is provided with a stud which is screwed into the threaded hole.

11. The coaxiality inspection tool according to claim 9, characterized in that: The positioning seat includes a coaxially connected cone and a cylinder, the conical surface of the cone is the conical surface, and the coaxiality inspection tool also includes an elastic member, one end of the elastic member abuts against the cone, and the other end of the elastic member abuts against the end plate.

12. The coaxiality inspection tool according to claim 11, characterized in that: The elastic member is configured as a spring, and the spring is sleeved on the outside of the cylinder.

13. The coaxiality inspection tool according to claim 1, characterized in that: A chamfered surface is formed on the side wall of the hole to be measured away from the standard hole, and the conical surface portion is used to abut against the annular surface of the chamfered surface.

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