Detection tool for detecting diameter of shallow counter bore

Abstract

The invention provides a detection tool for detecting the diameter of a shallow counter bore, which comprises a detection tool main body and a dial indicator, the dial indicator is detachably installed in the detection tool main body through a fixing structure, a measuring pin of the dial indicator is connected with an adapter plate, one side of the adapter plate far away from the dial indicator is provided with an adapter measuring pin, the adapter measuring pin is located below the detection tool main body, and the adapter measuring pin is connected with the dial indicator. The testing fixture body is provided with a through groove for movement of the dial gauge probe and the adapter plate, and the testing fixture body is connected with a limiting mechanism used for limiting the relative position of the testing fixture body and the shallow counter bore. According to the invention, the adapter probe connected with the dial indicator probe is arranged, and the adapter probe is introduced into the shallow counter bore of the workpiece, so that the shallow counter bore is indirectly measured by the dial indicator probe, the measurement is not limited by the shape of the dial indicator probe, and the requirement of a conventional dial indicator for measuring the diameter of the shallow counter bore of the vehicle rear hub workpiece is met.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle rear wheel hub detection, and in particular to a detection tool for detecting the diameter of a shallow countersunk hole. Background Art

[0002] The rear wheel hub of a vehicle is formed into a finished product after being machined from a blank through several processing steps. Among them, countersinking is an important process, and the accuracy of the countersink size is very critical. The bottom of the hole is close to the end face of the hub workpiece, that is, the depth of the countersink is shallow. After the processing size and accuracy are completed, when using an ordinary internal diameter micrometer to measure the size of the countersink hole diameter, it is difficult to reach the position of the diameter to be measured due to the shape of the micrometer probe being limited by space. The measurement is inconvenient and the accuracy of the reading cannot be guaranteed, which easily causes the dimensional error to increase, and then easily causes the workpiece to be scrapped or reworked. If the workpiece needs to be reworked for a second time, it will cause a great waste of personnel and equipment. Summary of the invention

[0003] In order to solve the problem in the background technology, the present invention proposes a gauge for detecting the diameter of a shallow countersunk hole, comprising a gauge body and a micrometer, wherein the micrometer is detachably installed in the gauge body through a fixed structure, the micrometer probe is connected to an adapter plate, a side of the adapter plate away from the micrometer is provided with an adapter probe, the adapter probe is located below the gauge body, a through groove for the micrometer probe and the adapter plate to move is provided on the gauge body, and the gauge body is connected to a limiting mechanism for limiting the relative position of the gauge body and the shallow countersunk hole. Preferably, a mounting plate is fixed in the through slot of the gauge body, the micrometer is detachably mounted on the mounting plate via a fixing structure, and the micrometer is located at the center of the mounting plate.

[0004] Preferably, the limiting mechanism comprises a fixed rod, a rotating cylinder and a supporting mechanism, the top end of the fixed rod is fixedly connected to the bottom end of the mounting plate, the axis of the fixed rod is located at the center of the mounting plate, the top end of the rotating cylinder is rotatably connected to the bottom end of the fixed rod, and the rotating cylinder is coaxial with the fixed rod; The supporting mechanism comprises a fixed screw and a connecting rod, the fixed screw is rotatably arranged in the rotating cylinder, the outer wall of the fixed screw is sequentially sleeved with a moving ring and a fixed ring from top to bottom, the fixed ring and the moving ring are both threadedly connected with the fixed screw, the fixed ring is fixedly connected with the rotating cylinder, the moving ring is slidably arranged in the rotating cylinder, three fixed cylinders are arranged at equal intervals along the circumferential direction on the outer wall of the fixed ring, a telescopic rod is slidably connected in the fixed cylinder, the telescopic rod is located at one end of the fixed cylinder away from the fixed screw, a second spring is arranged between the telescopic rod and the fixed cylinder, and the second spring is in a compressed state; One end of the connecting rod is hinged to the telescopic rod, and the other end of the connecting rod is hinged to the moving ring; The fixed screw rod, the movable ring and the fixed ring are all coaxial with the rotating cylinder. A through hole for the fixed cylinder to pass through and a sliding groove for the connecting rod to move are provided on the circumference of the rotating cylinder.

[0005] Preferably, the telescopic rod comprises a telescopic rod and a telescopic sleeve, the telescopic sleeve is slidably sleeved on the outer wall of the fixed cylinder, one end of the telescopic rod is slidably arranged in the telescopic sleeve and the fixed cylinder, the other end of the telescopic rod extends outside the telescopic sleeve, the end of the telescopic rod away from the fixed cylinder is fixed with a supporting foot, the outer wall of the end of the telescopic rod away from the fixed cylinder is sleeved with a first spring, one end of the first spring is fixedly connected to the supporting foot, the other end of the first spring is fixedly connected to the telescopic sleeve, and the end of the connecting rod away from the moving ring is hinged to the telescopic sleeve; The outer wall of the fixed cylinder is sleeved with a second spring, one end of the second spring is fixedly connected to the fixed ring, the other end of the second spring is fixedly connected to the telescopic sleeve, and the second spring is in a compressed state.

[0006] Preferably, a side of the support foot away from the fixing tube is provided with a raised pattern, and the bottom of the side of the support foot away from the fixing tube is an inclined surface, which slopes downward obliquely from the side of the support foot away from the fixing tube to the side close to the fixing tube.

[0007] Preferably, a ferrule is provided at the top of the adapter plate, and the ferrule is located on the side of the adapter plate away from the dial gauge, and the connection between the adapter plate and the dial gauge needle is achieved by sleeve-fitting the ferrule on the end of the dial gauge needle; A limiting rod is fixed on the adapter plate, a limiting hole is provided on the fixing rod, and the limiting rod is slidably inserted into the limiting hole.

[0008] Preferably, a ball is rotatably provided at the tip of the adapter probe.

[0009] Preferably, the fixing structure includes a bidirectional screw and two clamping plates, the mounting plate is provided with a sliding groove, the bidirectional screw is rotatably arranged in the sliding groove, the threads at both ends of the bidirectional screw are opposite, the bottom ends of the two clamping plates are slidably arranged in the sliding groove, and the bottom ends of the two clamping plates are respectively threadedly connected to the two ends of the bidirectional screw, and the opposite sides of the two clamping plates are provided with card slots.

[0010] The present invention has the following beneficial effects: The present invention is provided with an adapter probe connected to the micrometer probe. By introducing the adapter probe into the shallow countersunk hole of the workpiece, the micrometer probe can indirectly measure the shallow countersunk hole, and the measurement is not limited by the shape of the micrometer probe. In addition, the micrometer in the present invention is detachably connected to the inspection fixture body through a fixed structure, and a suitable micrometer can be selected according to the size of the workpiece, which is flexible to use. The present invention can meet the needs of conventional micrometers for measuring the diameter of the shallow countersunk hole of the rear wheel hub workpiece of the vehicle.

[0011] The present invention is provided with a limit mechanism, which can realize the connection between the gauge body and the workpiece, so as to facilitate the measurement. At the same time, the gauge body can rotate relative to the rotating cylinder in the limit mechanism, and when the gauge body rotates, the micrometer and the adapter probe are driven to rotate, so as to realize the comprehensive detection of the diameter of the shallow countersunk hole, and ensure the detection accuracy. In addition, the limit mechanism can ensure the coaxiality between the rotation center of the gauge body and the shallow countersunk hole by setting three support feet arranged at equal intervals, so as to further ensure the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The overall structure of Example 1 of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of Example 1 of the present invention is shown in FIG. Figure 2 ; Figure 3 This is a schematic diagram of the structure of Example 1 of the present invention when the dial gauge is not installed; Figure 4 This is a schematic diagram of the support mechanism structure of Example 1 of the present invention; Figure 5 This is a schematic diagram of the connection relationship between the telescopic sleeve, the telescopic rod and the fixed sleeve in Example 1 of the present invention; Figure 6 This is a schematic diagram of the connection relationship between the embodiment 1 of the present invention and the workpiece in the detection state.

[0013] Numbers in the figure: 1. Gauge body; 2. Through slot; 3. Mounting plate; 4. Adapter plate; 5. Cardan; 6. Adapter probe; 7. Sliding slot; 8. Bidirectional screw; 9. Clamp; 10. First knob; 11. Micrometer; 12. Support foot; 13. First spring; 14. Telescopic sleeve; 15. Telescopic rod; 16. Fixed cylinder; 17. Connecting rod; 18. Limit rod; 19. Fixed rod; 20. Rotating cylinder; 21. Second knob; 22. Fixed ring; 23. Moving ring; 24. Fixed screw; 25. Workpiece; 251. Shallow countersunk hole; 252. Inner hole. DETAILED DESCRIPTION

[0014] In order to make the present invention clearer and more understandable, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the given embodiments are only two of the implementation methods and do not represent all embodiments.

[0015] In this article, the terms "inside, outside, up, down" and so on are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, they cannot be understood as an absolute limitation on the scope of protection.

[0016] Embodiment 1: Combined with Figure 1 -Attached Figure 6 A gauge for detecting the diameter of a shallow countersunk hole comprises a gauge body 1 and a micrometer 11, wherein the micrometer 11 is detachably mounted in the gauge body 1 through a fixed structure, a probe of the micrometer 11 is connected to an adapter plate 4, a transfer probe 6 is provided on a side of the adapter plate 4 away from the micrometer 11, and the transfer probe 6 is located below the gauge body 1, a through slot 2 is provided on the gauge body 1 for movement of the probe of the micrometer 11 and the adapter plate 4, and a limiting mechanism for limiting the relative position of the gauge body 1 and the shallow countersunk hole 251 is connected to the gauge body 1.

[0017] During detection, the micrometer 11 probe is driven to move by the adapter plate 4 and the adapter probe 6, so that the micrometer 11 probe can indirectly detect the shallow countersunk hole 251. There is no need to directly place the micrometer 11 into the shallow countersunk hole 251, which facilitates the detection of the shallow countersunk hole 251 by the micrometer 11.

[0018] Specifically, a mounting plate 3 is fixed in the through slot 2 of the gauge body 1, and the micrometer 11 is detachably mounted on the mounting plate 3 through a fixing structure, and the micrometer 11 is located at the center of the mounting plate 3. The limiting mechanism includes a fixing rod 19, a rotating cylinder 20 and a supporting mechanism, the top of the fixing rod 19 is fixedly connected to the bottom of the mounting plate 3, the axis of the fixing rod 19 is located at the center of the mounting plate 3, the top of the rotating cylinder 20 is rotatably connected to the bottom of the fixing rod 19, and the rotating cylinder 20 is coaxial with the fixing rod 19; The supporting mechanism comprises a fixed screw 24 and a connecting rod 17, wherein the fixed screw 24 is rotatably arranged in the rotating cylinder 20, and a movable ring 23 and a fixed ring 22 are sequentially sleeved on the outer wall of the fixed screw 24 from top to bottom, wherein the fixed ring 22 and the movable ring 23 are both threadedly connected with the fixed screw 24, the fixed ring 22 is fixedly connected with the rotating cylinder 20, and the movable ring 23 is slidably arranged in the rotating cylinder 20, and three fixed cylinders 16 are equidistantly arranged on the outer wall of the fixed ring 22 along the circumferential direction, that is, the angle between the axes of the three fixed cylinders 16 is 120°, and a telescopic rod 15 is slidably connected in the fixed cylinder 16, and the telescopic rod 15 is located at one end of the fixed cylinder 16 away from the fixed screw 24, and a second spring is arranged between the telescopic rod 15 and the fixed cylinder 16, and the second spring is in a compressed state; more specifically, the bottom end of the fixed screw 24 extends to the outside of the rotating cylinder 20, and is fixed with a second knob 21, and the second knob 21 is arranged to facilitate the detection personnel to rotate the fixed screw 24.

[0019] One end of the connecting rod 17 is hinged to the telescopic rod 15, and the other end of the connecting rod 17 is hinged to the moving ring 23; The fixed screw 24 , the movable ring 23 and the fixed ring 22 are all coaxial with the rotating cylinder 20 . The rotating cylinder 20 is provided with a through hole for the fixed cylinder 16 to pass through and a sliding groove for the connecting rod 17 to move.

[0020] Specifically, the telescopic rod 15 comprises a telescopic rod 15 and a telescopic sleeve 14, the telescopic sleeve 14 is slidably sleeved on the outer wall of the fixed cylinder 16, one end of the telescopic rod 15 is slidably set in the telescopic sleeve 14 and the fixed cylinder 16, the other end of the telescopic rod 15 extends outside the telescopic sleeve 14, the end of the telescopic rod 15 away from the fixed cylinder 16 is fixed with a supporting foot 12, the outer wall of the end of the telescopic rod 15 away from the fixed cylinder 16 is sleeved with a first spring 13, one end of the first spring 13 is fixedly connected to the supporting foot 12, the other end of the first spring 13 is fixedly connected to the telescopic sleeve 14, and the end of the connecting rod 17 away from the moving ring 23 is hinged to the telescopic sleeve 14; The outer wall of the fixed tube 16 is provided with a second spring (not shown in the drawings), one end of the second spring is fixedly connected to the fixed ring 22, and the other end of the second spring is fixedly connected to the telescopic sleeve 14. The second spring is in a compressed state, and the second spring can provide a force for the telescopic sleeve 14 to move away from the fixed tube 16. The second spring and the connecting rod 17 cooperate to limit the position of the telescopic sleeve 14.

[0021] The angle between the axes of the three fixed cylinders 16 is 120°. Correspondingly, the three supporting feet 12 are also arranged at equal intervals along the circumference of the rotating cylinder 20. After the three supporting feet 12 are pressed against the inner wall of the inner hole 252 of the workpiece 25, the rotating cylinder 20 can be located at the center position of the inner hole 252 of the workpiece 25, thereby ensuring that the rotation center of the gauge body 1 when rotating corresponds to the center position of the inner hole 252 of the shallow countersunk hole 251.

[0022] When inspection is required, the position of the support foot 12 is roughly adjusted according to the diameter of the inner hole 252 of the workpiece 25. The adjustment process is: rotate the fixed screw 24, and the moving ring 23 moves up or down along the fixed screw 24, thereby driving one end of the connecting rod 17 to move up or down through the moving ring 23, and the other end of the connecting rod 17 drives the telescopic sleeve 14 to move along the fixed cylinder 16, and the telescopic sleeve 14 drives the support foot 12 to approach or move away from the fixed cylinder 16 through the first spring 13. The position of the support foot 12 is adjusted until the position of the support foot 12 from the side of the fixed cylinder 16 to the center of the rotating cylinder 20 is greater than the diameter of the inner hole 252 of the workpiece 25, so that when the support foot 12 enters the inner hole 252, the first spring 13 is in a compressed state, and the first spring 13 can provide force for the support foot 12, so that the three support feet 12 can press against the inner wall of the inner hole 252, thereby realizing the connection between the inspection fixture body 1 and the workpiece 25.

[0023] After adjusting the position of the support foot 12, put the support foot 12 into the inner hole 252 of the workpiece 25, so that the gauge body 1 is preliminarily connected to the workpiece 25 through the limit mechanism, and the transfer probe 6 is located outside the workpiece 25. Push the adapter plate 4, and drive the probe of the micrometer 11 to retract through the adapter plate 4, so that the transfer probe 6 is in a position where it can enter the shallow countersunk hole 251, and then press down the gauge body 1, and the gauge body 1 drives the support foot 12 to move axially along the inner hole 252 of the workpiece 25 until the transfer probe 6 enters the shallow countersunk hole 251. After the transfer probe 6 enters the shallow countersunk hole 251, release the adapter plate 4 so that the transfer probe 6 is against the inner wall of the shallow countersunk hole 251.

[0024] The inspection fixture body 1 is rotated to allow the adapter probe 6 to fully inspect the diameter of the shallow countersunk hole 251 .

[0025] Specifically, a raised pattern is provided on the side of the supporting foot 12 away from the fixed tube 16, which can increase the friction between the supporting foot 12 and the inner hole 252, thereby improving the fixing effect between the inspection fixture and the workpiece 25 in the absence of external force; the bottom of the side of the supporting foot 12 away from the fixed tube 16 is an inclined surface, which slopes downward from the side of the supporting foot 12 away from the fixed tube 16 to the side close to the fixed tube 16. The setting of the inclined surface facilitates the supporting foot 12 to enter the inner hole 252 of the workpiece 25.

[0026] Specifically, a ferrule 5 is provided at the top of the adapter plate 4, and the ferrule 5 is located on the side of the adapter plate 4 away from the dial gauge 11. The adapter plate 4 and the measuring needle of the dial gauge 11 are connected by sleeve-mounting the ferrule 5 on the end of the measuring needle of the dial gauge 11. The blocking effect of the ferrule 5 can realize the mutual driving movement of the measuring needle of the dial gauge 11 and the adapter plate 4, and the sleeve-mounting method is easy to install and disassemble, and is convenient to use. A limiting rod 18 is fixed on the adapter plate 4 , and a limiting hole is provided on the fixing rod 19 . The limiting rod 18 is slidably inserted into the limiting hole. The cooperation between the limiting rod 18 and the limiting hole can improve the stability of the movement of the adapter plate 4 .

[0027] Specifically, a ball is rotatably provided at the tip of the adapter probe 6, which can reduce the friction between the adapter probe 6 and the inner wall of the shallow countersunk hole 251, facilitate the relative movement of the adapter probe 6 and the inner wall of the shallow countersunk hole 251, and avoid damage to the workpiece 25 or the adapter probe 6.

[0028] Specifically, the fixing structure includes a bidirectional screw 8 and two clamps 9. A sliding groove 7 is provided on the mounting plate 3. The bidirectional screw 8 is rotatably set in the sliding groove 7. The threads at both ends of the bidirectional screw 8 are opposite. The bottom ends of the two clamps 9 are slidably set in the sliding groove 7, and the bottom ends of the two clamps 9 are respectively threadedly connected to the two ends of the bidirectional screw 8. The two clamps 9 are provided with card slots on the opposite sides, and the card slots can limit the position of the micrometer 11. By turning the bidirectional screw 8, the two clamps 9 can be driven by the bidirectional screw 8 to move closer to or away from each other, thereby achieving the clamping or loosening of the micrometer 11. More specifically, one end of the bidirectional screw 8 extends to the outside of the inspection fixture body 1, and is fixed with a first knob 10. The first knob 10 is provided to facilitate the inspection personnel to rotate the bidirectional screw 8.

[0029] Embodiment 2: A gauge for detecting the diameter of a shallow countersunk hole comprises a gauge body 1 and a micrometer 11, wherein the micrometer 11 is detachably mounted in the gauge body 1 through a fixed structure, a probe of the micrometer 11 is connected to an adapter plate 4, a side of the adapter plate 4 away from the micrometer 11 is provided with an adapter probe 6, the adapter probe 6 is located below the gauge body 1, a through slot 2 is provided on the gauge body 1 for movement of the probe of the micrometer 11 and the adapter plate 4, and a limiting mechanism is connected to the gauge body 1 for limiting the relative position of the gauge body 1 and the shallow countersunk hole 251.

[0030] The limiting mechanism includes a clamping block, which is fixed at the bottom of the end of the inspection fixture body 1 away from the transfer probe 6. The clamping block, the transfer probe 6 and the moving direction of the probe of the micrometer 11 are located on the same straight line, and the height position of the clamping block corresponds to that of the transfer probe 6.

[0031] In the initial state, the distance between the card block and the adapter probe 6 is greater than the diameter of the shallow countersunk hole 251. During inspection, the inspection fixture body 1 is placed above the workpiece 25 so that the side end of the card block is in close contact with the inner wall of the shallow countersunk hole 251 of the workpiece 25. At the same time, the adapter plate 4 is pushed to shrink the probe of the micrometer 11 until the distance between the adapter probe 6 and the card block is less than the diameter of the shallow countersunk hole 251, so that the adapter probe 6 enters the shallow countersunk hole 251. The adapter plate 4 is released, and the probe of the micrometer 11 tends to extend, driving the adapter probe 6 to be in close contact with the inner wall of the shallow countersunk hole 251 of the workpiece 25. The inspection fixture body 1 is rotated so that the micrometer 11 and the adapter probe 6 rotate with the inspection fixture body 1. The measurement personnel obtain the inner diameter of the shallow countersunk hole 251 by observing the changes in the pointer of the micrometer 11.

[0032] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gauge for detecting the diameter of a shallow countersunk hole, characterized in that: The invention comprises a gauge body (1) and a micrometer (11), wherein the micrometer (11) is detachably mounted in the gauge body (1) via a fixing structure, a probe of the micrometer (11) is connected to an adapter plate (4), a transfer probe (6) is provided on a side of the adapter plate (4) away from the micrometer (11), and the transfer probe (6) is located below the gauge body (1), a through slot (2) is provided on the gauge body (1) for movement of the probe of the micrometer (11) and the adapter plate (4), and a limit mechanism is connected to the gauge body (1) for limiting the relative position of the gauge body (1) and the shallow counterbore (251).

2. A gauge for detecting the diameter of a shallow countersunk hole according to claim 1, characterized in that: A mounting plate (3) is fixed in the through slot (2) of the gauge body (1), and the micrometer (11) is detachably mounted on the mounting plate (3) via a fixing structure, and the micrometer (11) is located at the center of the mounting plate (3).

3. A gauge for detecting the diameter of a shallow countersunk hole according to claim 2, characterized in that: The limiting mechanism comprises a fixed rod (19), a rotating cylinder (20) and a supporting mechanism, the top end of the fixed rod (19) is fixedly connected to the bottom end of the mounting plate (3), the axis of the fixed rod (19) is located at the center of the mounting plate (3), the top end of the rotating cylinder (20) is rotatably connected to the bottom end of the fixed rod (19), and the rotating cylinder (20) and the fixed rod (19) are coaxial; The support mechanism comprises a fixed screw (24) and a connecting rod (17); the fixed screw (24) is rotatably arranged in the rotating cylinder (20); the outer wall of the fixed screw (24) is sleeved with a moving ring (23) and a fixed ring (22) in sequence from top to bottom; the fixed ring (22) and the moving ring (23) are both threadedly connected to the fixed screw (24); the fixed ring (22) is fixedly connected to the rotating cylinder (20); the moving ring (23) is slidably arranged in the rotating cylinder (20); three fixed cylinders (16) are arranged at equal intervals along the circumferential direction on the outer wall of the fixed ring (22); a telescopic rod (15) is slidably connected inside the fixed cylinder (16); the telescopic rod (15) is located at one end of the fixed cylinder (16) away from the fixed screw (24); a second spring is arranged between the telescopic rod (15) and the fixed cylinder (16); the second spring is in a compressed state; One end of the connecting rod (17) is hinged to the telescopic rod (15), and the other end of the connecting rod (17) is hinged to the moving ring (23); The fixed screw rod (24), the movable ring (23) and the fixed ring (22) are all coaxial with the rotating cylinder (20), and a through hole for the fixed cylinder (16) to pass through and a sliding groove for the connecting rod (17) to move are provided on the circumference of the rotating cylinder (20).

4. A gauge for detecting the diameter of a shallow countersunk hole according to claim 3, characterized in that: The telescopic rod (15) comprises a telescopic rod (15) and a telescopic sleeve (14), wherein the telescopic sleeve (14) is slidably sleeved on the outer wall of the fixed cylinder (16), one end of the telescopic rod (15) is slidably sleeved in the telescopic sleeve (14) and the fixed cylinder (16), and the other end of the telescopic rod (15) extends outside the telescopic sleeve (14), one end of the telescopic rod (15) away from the fixed cylinder (16) is fixed with a supporting foot (12), the outer wall of the end of the telescopic rod (15) away from the fixed cylinder (16) is sleeved with a first spring (13), one end of the first spring (13) is fixedly connected to the supporting foot (12), and the other end of the first spring (13) is fixedly connected to the telescopic sleeve (14), and one end of the connecting rod (17) away from the movable ring (23) is hinged to the telescopic sleeve (14); A second spring is sleeved on the outer wall of the fixed cylinder (16); one end of the second spring is fixedly connected to the fixed ring (22); the other end of the second spring is fixedly connected to the telescopic sleeve (14); and the second spring is in a compressed state.

5. A gauge for detecting the diameter of a shallow countersunk hole according to claim 4, characterized in that: A side of the support foot (12) away from the fixed tube (16) is provided with a raised pattern, and a bottom of the side of the support foot (12) away from the fixed tube (16) is an inclined surface, the inclined surface being inclined downward from the side of the support foot (12) away from the fixed tube (16) to the side close to the fixed tube (16).

6. A gauge for detecting the diameter of a shallow countersunk hole according to claim 3, characterized in that: A ferrule (5) is provided at the top of the adapter plate (4), the ferrule (5) being located on a side of the adapter plate (4) away from the dial gauge (11), and the adapter plate (4) and the measuring needle of the dial gauge (11) are connected by sleeve-fitting the ferrule (5) onto the end of the measuring needle of the dial gauge (11); A limiting rod (18) is fixed on the adapter plate (4), a limiting hole is provided on the fixing rod (19), and the limiting rod (18) is slidably inserted into the limiting hole.

7. A gauge for detecting the diameter of a shallow countersunk hole according to claim 6, characterized in that: A ball is rotatably provided at the tip of the adapter probe (6).

8. The inspection tool for detecting the diameter of a shallow countersunk hole according to claim 2, characterized in that: The fixing structure comprises a bidirectional screw (8) and two clamping plates (9); a sliding groove (7) is provided on the mounting plate (3); the bidirectional screw (8) is rotatably arranged in the sliding groove (7); the threads at both ends of the bidirectional screw (8) are opposite; the bottom ends of the two clamping plates (9) are slidably arranged in the sliding groove (7); the bottom ends of the two clamping plates (9) are respectively threadedly connected to the two ends of the bidirectional screw (8); and the opposite sides of the two clamping plates (9) are provided with clamping grooves.

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