Measuring instrument for hole-series bushing part

Abstract

The invention belongs to the technical field of machining, and particularly relates to a hole-series bushing part measuring instrument which comprises a base, and the top of the base is provided with a first slide way and a second slide way; the pretreatment mechanism is mounted at the top of the base, and the bottom of the pretreatment mechanism is slidably connected with the top, close to the second slide way, of the base; the measuring mechanism and the clamping mechanism are arranged to drive the measured part to be far away from the measuring rod, after the measured part rotates by a certain angle, the next small hole is aligned with the measuring rod, recording is carried out again, and finally all measuring results are recorded in a digital form. According to the method, a mechanical measurement device is simple in structure, convenient to operate and high in measurement precision, can be widely applied to rapid measurement of high and low points between holes of various hole series bushing parts, and can effectively improve the product quality and the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically a measuring instrument for hole bushing parts. Background Technology

[0002] In the mechanical manufacturing process, bushings are a common component, widely used in various hydraulic equipment and parts. The outer wall of the bushing usually has a ring of small holes. The positional and dimensional accuracy of these holes have a significant impact on the performance and lifespan of the shaft and bushing. Accurately measuring the height difference between the small holes on the outer circle of the bushing is of great significance for ensuring product quality and production efficiency.

[0003] However, existing measurement methods often suffer from low accuracy and complex operation, making it difficult to meet the high efficiency and high precision requirements of modern mechanical manufacturing. Summary of the Invention

[0004] To address the problem that existing pipe components suffer wear due to frequent movement of descaling equipment, the present invention provides a technical solution: a measuring instrument for hole bushing parts, comprising a base, wherein the top of the base is provided with a first slide and a second slide;

[0005] A pretreatment mechanism is mounted on the top of the base, and the bottom of the pretreatment mechanism is slidably connected to the top of the base near the second slide rail.

[0006] A measuring mechanism is mounted on the base near the pretreatment mechanism.

[0007] The measuring mechanism includes:

[0008] A support guide sleeve is mounted on top of the base;

[0009] A sliding column, the outer wall of which is slidably connected to the inner wall of the supporting guide sleeve;

[0010] A measuring rod is mounted on the outer wall of the sliding column.

[0011] Furthermore, the measuring instruments for this hole system bushing part also include:

[0012] A clamping mechanism, the bottom of which is slidably connected to the top of the base near the first slide rail;

[0013] The part to be tested is placed on top of the base, and the inner wall of the part to be tested is in contact with the outer wall of the clamping mechanism.

[0014] Furthermore, the measuring mechanism also includes:

[0015] A spring is mounted on the bottom of a sliding column, and the outer wall of the spring is sleeved with the inner wall of the base.

[0016] A plug, the outer wall of which is connected to the inner wall of the base, and the top of which is connected to the bottom of the spring.

[0017] Furthermore, the measuring mechanism also includes:

[0018] A fastening screw, the outer wall of which is threadedly connected to the inner wall of the support guide sleeve;

[0019] The bottom of the meter head contacts the top of the slide column, and the meter head is fixed to the top of the support guide sleeve by fastening screws.

[0020] Furthermore, the measuring mechanism also includes:

[0021] The measuring rod is installed on the outer wall of the sliding column, and the outer wall of the supporting guide sleeve is symmetrically provided with limiting holes, and the moving range of the measuring rod is within the limiting holes;

[0022] A contact block is provided at the end of the measuring rod away from the sliding column.

[0023] Furthermore, the pretreatment mechanism includes:

[0024] The first slider has its bottom slidably connected to the top of the base near the second slide rail.

[0025] The first telescopic column, the bottom of which is mounted on the top of the first slider;

[0026] A power supply block is installed on the top of the first telescopic column, and a slot is provided on the side of the power supply block near the part being tested.

[0027] Furthermore, the pretreatment mechanism also includes:

[0028] The card blocks are symmetrically arranged on the outer wall of the power block, and the outer wall of the card blocks is slidably connected to the outer wall of the power block;

[0029] A rotating rod, one end of which is rotatably connected to the outer wall of the clamping block, and a cleaning ring is provided at the end of the rotating rod near the part being tested.

[0030] Furthermore, the clamping mechanism includes:

[0031] The second slider has its bottom slidably connected to the top of the base near the first slide rail;

[0032] A flexible hose, one end of which is connected to the outer wall of the second slider, and the outer wall of the flexible hose is sleeved with the inner wall of the base.

[0033] Furthermore, the clamping mechanism also includes:

[0034] The second telescopic column is rotatably connected to the top of the second sliding column;

[0035] An internal support assembly is evenly disposed on the top of the second telescopic column, and the outer wall of the internal support assembly is in contact with the inner wall of the part being tested.

[0036] Furthermore, the internal support component includes:

[0037] A folding rod, the outer wall of which is rotatably connected to the top of the second telescopic column, and an elastic column is provided on the opposite side of the folding rod;

[0038] An electric actuator is installed on the top of the second telescopic column, and the other end of the electric actuator is connected to the bottom of the folding rod;

[0039] An anti-slip block is installed at the end of the folding rod away from the second telescopic column, and the inner wall of the anti-slip block is rotatably connected to the outer wall of the folding rod.

[0040] The beneficial effects of this invention are as follows:

[0041] 1. This invention uses a measuring mechanism and a clamping mechanism to move the part being measured away from the measuring rod. After rotating it by a certain angle, the next small hole is aligned with the measuring rod, and the measurement is recorded again. Finally, all measurement results are recorded in digital form to find the highest and lowest points in a circle of small holes. No manual measurement is required. The mechanical measuring device of this method has a simple structure, is easy to operate, and has high measurement accuracy. The measurement accuracy is even higher when a dial indicator is used. It can be widely used for the rapid measurement of high and low points between holes in various hole system bushing parts, which can effectively improve product quality and production efficiency.

[0042] 2. This invention features a pre-treatment mechanism. The cleaning ring is inserted close to the small hole. Due to the relatively soft material of the cleaning ring, the diameter of the rotating rod is smaller than the diameter of the small hole, ensuring that the edge of the cleaning ring remains in contact with the inner wall of the small hole. This allows the cleaning ring to clean small holes of different diameters. After cleaning, the small hole is aligned with the measuring rod for measurement. This avoids impurities inside the small hole affecting the contact between the contact rod and the inner wall of the small hole, preventing the contact head from contacting foreign objects and causing significant deviations in the measurement results. By adjusting the distance between the clamping blocks, parts with different distances between small holes can be cleaned. This invention is suitable for measuring various types of parts and reduces errors in small hole height measurement.

[0043] 3. This invention uses a clamping mechanism to rotate the part under test, aligning the cleaned hole with the measuring rod. Then, driven by the second slider, the part under test is brought close to the hole to measure its height. The next cleaned hole is then rotated to align with the measuring rod. The entire process is automated, avoiding human interference with the measurement results and maintaining the stability of the part under test during the test. This helps to control variables for multiple holes on the same part under test, making the measurement results more accurate.

[0044] 4. This invention, by setting an internal support component, ensures that the top of the anti-sliding block contacts the top of the inner wall of the part being tested, while the bottom of the part being tested contacts the top of the base. Subsequently, the electric push rod is pushed outward, causing the folding rod to unfold under the thrust, pushing the anti-sliding block outward so that it also contacts the inner wall of the part being tested. This clamps the part being tested from multiple corners, ensuring that the part being tested remains stable before testing, making the measurement process more stable and thus maintaining the accuracy of the results. The mechanical movement reduces errors during the measurement process and avoids significant differences between different small holes of the same part being tested due to manual intervention, which would affect measurement efficiency. Attached Figure Description

[0045] Figure 1 This is the front view of the present invention;

[0046] Figure 2 This is a schematic diagram of part of the mechanism of the present invention;

[0047] Figure 3 This is a schematic diagram of the pretreatment mechanism of the present invention;

[0048] Figure 4 This is a schematic diagram of the measuring mechanism of the present invention;

[0049] Figure 5 This is a partial structural schematic diagram of the measuring mechanism of the present invention;

[0050] Figure 6 This is the present invention. Figure 5 Enlarged view of point A in the middle;

[0051] Figure 7 This is a schematic diagram of the clamping mechanism of the present invention;

[0052] Figure 8 This is a schematic diagram of the internal support components of the present invention.

[0053] In the diagram: 1. Base; 2. Part to be measured; 3. Pre-treatment mechanism; 301. First slider; 302. First telescopic column; 303. Power block; 304. Rotating rod; 305. Cleaning ring; 306. Slot; 307. Locking block; 4. Measuring mechanism; 401. Support guide sleeve; 402. Sliding column; 403. Spring; 404. Plug; 405. Meter head; 406. Fastening screw; 407. Limiting hole; 408. Measuring rod; 409. Contact block; 5. Clamping mechanism; 501. Second slider; 502. Hoses; 503. Second telescopic column; 504. Internal support assembly; 5041. Electric push rod; 5042. Folding rod; 5043. Elastic column; 5044. Anti-slip block; 6. First slide rail; 7. Second slide rail. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0055] Example 1, please refer to Figures 1-6 The present invention provides a technical solution: a measuring instrument for hole bushing parts, including a base 1, and a first slide 6 and a second slide 7 are provided on the top of the base 1;

[0056] The pretreatment mechanism 3 is installed on the top of the base 1, and the bottom of the pretreatment mechanism 3 is slidably connected to the top of the base 1 near the second slide 7.

[0057] Measuring mechanism 4 is installed on the side of base 1 near pretreatment mechanism 3;

[0058] The measuring instruments for this hole system bushing part also include:

[0059] The bottom of the clamping mechanism 5 is slidably connected to the top of the base 1 near the first slide rail 6;

[0060] The part under test 2 is placed on top of the base 1, and the inner wall of the part under test 2 is in contact with the outer wall of the clamping mechanism 5.

[0061] During operation, the worker places the part to be tested 2 on the top of the clamping mechanism 5 and presses it down so that the bottom of the part to be tested 2 contacts the top of the base 1 and remains horizontal. Then, the pre-processing mechanism 3 approaches the part to be tested 2 and cleans the round holes on the part to be tested 2. Then, driven by the clamping mechanism 5, the part to be tested 2 aligns the holes with the measuring mechanism 4, so that each hole on the part to be tested 2 moves closer to the measuring mechanism 4, finds the high and low points of the part to be tested 2 and reflects them to the meter 405, and then measures the height difference between the small holes on the part to be tested 2.

[0062] Measuring mechanism 4 includes:

[0063] Support guide sleeve 401 is installed on the top of base 1;

[0064] The outer wall of the sliding column 402 is slidably connected to the inner wall of the support guide sleeve 401;

[0065] The measuring rod 408 is installed on the outer wall of the sliding column 402.

[0066] Measuring mechanism 4 also includes:

[0067] Spring 403 is installed at the bottom of slide column 402, and the outer wall of spring 403 is sleeved with the inner wall of base 1.

[0068] The plug 404 has its outer wall connected to the inner wall of the base 1, and its top is connected to the bottom of the spring 403.

[0069] Measuring mechanism 4 also includes:

[0070] Fastening screw 406, the outer wall of fastening screw 406 is threaded to the inner wall of support guide sleeve 401;

[0071] The bottom of the meter head 405 contacts the top of the slide column 402. The meter head 405 is fixed to the top of the support guide sleeve 401 by the fastening screw 406. The bottom of the meter head 405 contacts the top of the slide column 402. The up and down movement of the slide column 402 reflects the height of the measuring rod 408 after contacting the round hole. The reading from the meter head 405 indicates the height of the small hole.

[0072] Measuring mechanism 4 also includes:

[0073] The measuring rod 408 is installed on the outer wall of the sliding column 402. The outer wall of the support guide sleeve 401 is symmetrically provided with limit holes 407. The movement range of the measuring rod 408 is within the limit holes 407.

[0074] Contact block 409 is provided at the end of the probe 408 away from the slide 402. The surface of contact block 409 is smooth, which makes the probe 408 more smoothly inserted into the round hole.

[0075] In use, first use the contact block 409 on the measuring rod 408 to find the reference by referring to the meter head 405. Then fix the part to be measured 2 on the support base. When the part to be measured 2 is brought close, the measuring rod 408 and the contact block 409 first contact the round hole on the part to be measured 2. The sliding column 402 moves radially along the support guide sleeve 401 to make the contact head contact the inner wall of a small hole on the outer circle of the part to be measured 2. The sliding column 402 moves up and down to make the sliding column 402 contact the meter head 405. Finally, the high and low points of this small hole on the part to be measured 2 can be read.

[0076] Subsequently, the clamping mechanism 5 moves the part to be measured 2 away from the measuring rod 408. After rotating a certain angle, the next small hole is aligned with the measuring rod 408, and the result is recorded again. Finally, all measurement results are recorded in digital form to find the highest and lowest points in a circle of small holes. No manual measurement is required. The mechanical measuring device of this method has a simple structure, is easy to operate, and has high measurement accuracy. The measurement accuracy is even higher when using a dial indicator 405. It can be widely used for the rapid measurement of high and low points between holes in various hole system bushing parts, which can effectively improve product quality and production efficiency.

[0077] Pre-processing unit 3 includes:

[0078] The bottom of the first slider 301 is slidably connected to the top of the base 1 near the second slide rail 7.

[0079] The bottom of the first telescopic column 302 is installed on the top of the first slider 301;

[0080] Power block 303 is installed on the top of the first telescopic column 302. A slot 306 is provided on the side of the power block 303 near the part 2 being tested.

[0081] Pretreatment unit 3 also includes:

[0082] Card block 307 is symmetrically arranged on the outer wall of power block 303, and the outer wall of card block 307 is slidably connected to the outer wall of power block 303.

[0083] Rotating rod 304, one end of which is rotatably connected to the outer wall of the clamping block 307, and a cleaning ring 305 is provided at the end of the rotating rod 304 near the part 2 being measured.

[0084] After the part to be measured 2 is fixed, the first slider 301 moves along the second slide rail 7 closer to the part to be measured 2, so that the height of the first telescopic column 302 is adjusted so that the height of the locking block 307 on the power block 303 is flush with the small hole. The motor built into the locking block 307 drives the rotating rod 304 to rotate, so that the cleaning ring 305 keeps rotating. Then, driven by the first slider 301, the cleaning ring 305 approaches the small hole and is inserted. Since the material of the cleaning ring 305 is relatively soft, the diameter of the rotating rod 304 is smaller than the diameter of the small hole, so that the edge of the cleaning ring 305 keeps in contact with the inner wall of the small hole, so that the cleaning ring 305 can clean small holes of different diameters. After wiping, the position of the small hole is aligned with the measuring rod 408 for measurement. This avoids impurities inside the small hole from affecting the contact between the contact rod and the inner wall of the small hole, causing the contact head to come into contact with foreign objects and thus causing a large deviation in the measurement result. By adjusting the distance between the locking blocks 307, the parts to be measured 2 with different distances between the small holes can be cleaned. This is suitable for measuring various types of parts and reduces the error in the measurement of the small hole height.

[0085] Clamping mechanism 5 includes:

[0086] The bottom of the second slider 501 is slidably connected to the top of the base 1 near the first slide rail 6.

[0087] The flexible hose 502 has one end connected to the outer wall of the second slider 501, and the outer wall of the flexible hose 502 is sleeved with the inner wall of the base 1.

[0088] The clamping mechanism 5 also includes:

[0089] The second telescopic column 503 is rotatably connected to the top of the second sliding section. The second telescopic column 503 is pneumatically connected and maintains air pressure balance through the hose 502.

[0090] The internal support assembly 504 is evenly arranged on the top of the second telescopic column 503, and the outer wall of the internal support assembly 504 is in contact with the inner wall of the part being tested 2.

[0091] Initially, the staff manually fastens the part to be tested 2 onto the internal support component 504, so that the edge of the internal support component 504 contacts the inner wall of the part to be tested 2 and generates a supporting force. Then, the staff presses down on the part to be tested 2, so that the internal support component 504 moves down together with the part to be tested 2, and the second telescopic column 503 retracts downward with the pressure, so that the bottom of the part to be tested 2 contacts the top of the base 1. By pressing, the internal support component 504 supports the inside of the part to be tested 2 in multiple directions, so that the supporting force of the part to be tested 2 is uniform.

[0092] The second telescopic column 503 drives the part 2 under test to rotate, aligning the cleaned hole with the measuring rod 408. Then, driven by the second slider 501, the part 2 under test is brought close to the hole to complete the height measurement of the hole. Then, the next cleaned hole is rotated to align with the measuring rod 408. The whole process can be automated, avoiding human interference with the measurement results and maintaining the stability of the part 2 under test during the test. This helps to control variables for multiple holes of the same part 2 under test, making the measurement results more accurate.

[0093] Example 2, please refer to Figures 1-8 The present invention provides a technical solution: based on embodiment 1, the internal support component 504 includes:

[0094] Folding rod 5042, the outer wall of folding rod 5042 is rotatably connected to the top of second telescopic column 503, and elastic column 5043 is provided on the opposite side of folding rod 5042;

[0095] Electric actuator 5041 is installed on the top of the second telescopic column 503, and the other end of the electric actuator 5041 is connected to the bottom of the folding rod 5042;

[0096] Anti-slip block 5044 is installed at the end of folding rod 5042 away from the second telescopic column 503, and the inner wall of anti-slip block 5044 is rotatably connected to the outer wall of folding rod 5042.

[0097] When the part to be tested 2 is fastened onto the second telescopic column 503, it is pressed down so that the top of the anti-slider 5044 contacts the top of the inner wall of the part to be tested 2, and the bottom of the part to be tested 2 contacts the top of the base 1. Then the electric push rod 5041 is pushed outward, so that the folding rod 5042 is pushed open and the anti-slider 5044 is pushed outward, so that the anti-slider 5044 also contacts the inner wall of the part to be tested 2. The part to be tested 2 is locked from multiple corners, so that the part to be tested 2 can remain stable before the test, making the measurement process more stable and thus maintaining the accuracy of the results. The mechanical movement can reduce the error in the measurement process and avoid the large difference between different holes of the same part to be tested 2 caused by manual intervention, which would affect the measurement efficiency.

[0098] The specific workflow is as follows:

[0099] Initially, the staff manually fastens the part to be tested 2 onto the internal support component 504, so that the edge of the internal support component 504 contacts the inner wall of the part to be tested 2 and generates a supporting force. Then, the staff presses down on the part to be tested 2, so that the internal support component 504 moves down together with the part to be tested 2, and the second telescopic column 503 retracts downward with the pressure, so that the bottom of the part to be tested 2 contacts the top of the base 1. By pressing, the internal support component 504 supports the inside of the part to be tested 2 in multiple directions, so that the supporting force of the part to be tested 2 is uniform.

[0100] The second telescopic column 503 drives the part 2 under test to rotate, aligning the cleaned hole with the measuring rod 408. Then, driven by the second slider 501, the part 2 under test is brought close to the hole to complete the height measurement of the hole. Then, the next cleaned hole is rotated to align with the measuring rod 408. The whole process can be automated, avoiding human interference with the measurement results and maintaining the stability of the part 2 under test during the test.

[0101] After the part to be tested 2 is fixed, the first slider 301 moves along the second slide 7 to approach the part to be tested 2, so that the height of the first telescopic column 302 is adjusted, and the height of the locking block 307 on the power block 303 is level with the small hole. The motor built into the locking block 307 drives the rotating rod 304 to rotate, so that the cleaning ring 305 keeps rotating. Then, driven by the first slider 301, the cleaning ring 305 approaches the small hole and is inserted. Since the material of the cleaning ring 305 is relatively soft, the diameter of the rotating rod 304 is smaller than the diameter of the small hole, so that the edge of the cleaning ring 305 keeps in contact with the inner wall of the small hole, so that the cleaning ring 305 can clean small holes of different diameters.

[0102] First, use the contact block 409 on the measuring rod 408 to find the reference by referring to the meter head 405. Then, fix the part to be measured 2 on the support base. When the part to be measured 2 is brought close, the measuring rod 408 and the contact block 409 first contact the round hole on the part to be measured 2. The sliding column 402 moves radially along the support guide sleeve 401 to make the contact head contact the inner wall of a small hole on the outer circle of the part to be measured 2. The sliding column 402 moves up and down to make the sliding column 402 contact the meter head 405. Finally, the high and low points of this small hole on the part to be measured 2 can be read.

[0103] Then, the clamping mechanism 5 moves the part to be measured 2 away from the measuring rod 408, rotates it a certain angle, aligns the next small hole with the measuring rod 408, records it again, and finally records all the measurement results in digital form to find the highest and lowest points in a circle of small holes.

[0104] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A measuring instrument for hole bushing parts, comprising a base (1), characterized in that: The top of the base (1) is provided with a first slide rail (6) and a second slide rail (7); A pretreatment mechanism (3) is installed on the top of the base (1), and the bottom of the pretreatment mechanism (3) is slidably connected to the top of the base (1) near the second slide (7). Measuring mechanism (4), which is mounted on the side of the base (1) near the pretreatment mechanism (3); The measuring mechanism (4) includes: A support guide sleeve (401) is mounted on the top of the base (1); A sliding column (402) is slidably connected to the inner wall of a support guide sleeve (401); A measuring rod (408) is mounted on the outer wall of a sliding column (402).

2. The measuring instrument for the hole system bushing parts according to claim 1, characterized in that: The measuring instruments for this hole system bushing part also include: The clamping mechanism (5) is slidably connected to the base (1) near the top of the first slide rail (6); The part to be tested (2) is placed on top of the base (1), and the inner wall of the part to be tested (2) is in contact with the outer wall of the clamping mechanism (5).

3. The measuring instrument for the hole system bushing parts according to claim 1, characterized in that: The measuring mechanism (4) also includes: A spring (403) is installed at the bottom of a slide column (402), and the outer wall of the spring (403) is sleeved with the inner wall of the base (1). A plug (404) is provided, the outer wall of which is connected to the inner wall of the base (1), and the top of which is connected to the bottom of the spring (403).

4. The measuring instrument for the hole system bushing parts according to claim 3, characterized in that: The measuring mechanism (4) also includes: Fastening screw (406), the outer wall of which is threadedly connected to the inner wall of support guide sleeve (401); The meter head (405) has its bottom in contact with the top of the slide column (402), and the meter head (405) is fixed to the top of the support guide sleeve (401) by fastening screws (406).

5. The measuring instrument for the hole system bushing part according to claim 4, characterized in that: The measuring mechanism (4) also includes: The measuring rod (408) is installed on the outer wall of the sliding column (402). The outer wall of the support guide sleeve (401) is symmetrically provided with limiting holes (407). The moving range of the measuring rod (408) is within the limiting holes (407). A contact block (409) is provided at the end of the measuring rod (408) away from the sliding column (402).

6. The measuring instrument for the hole system bushing parts according to claim 1, characterized in that: The pretreatment mechanism (3) includes: The bottom of the first slider (301) is slidably connected to the top of the base (1) near the second slide rail (7); The first telescopic column (302) is mounted on the top of the first slider (301) at its bottom. A power block (303) is installed on the top of the first telescopic column (302), and a slot (306) is provided on the side of the power block (303) near the part to be tested (2).

7. The measuring instrument for the hole system bushing parts according to claim 6, characterized in that: The pretreatment mechanism (3) further includes: Card block (307), the card block (307) is symmetrically arranged on the outer wall of the power block (303), and the outer wall of the card block (307) is slidably connected to the outer wall of the power block (303); A rotating rod (304) is provided at one end, which is rotatably connected to the outer wall of the clamping block (307). A cleaning ring (305) is provided at the end of the rotating rod (304) near the part (2) being tested.

8. The measuring instrument for the hole system bushing parts according to claim 2, characterized in that: The clamping mechanism (5) includes: The bottom of the second slider (501) is slidably connected to the top of the base (1) near the first slide rail (6); A flexible hose (502) is provided, one end of which is connected to the outer wall of the second slider (501), and the outer wall of the flexible hose (502) is sleeved with the inner wall of the base (1).

9. The measuring instrument for the hole system bushing parts according to claim 8, characterized in that: The clamping mechanism (5) further includes: The second telescopic column (503) is rotatably connected to the top of the second sliding column; An internal support assembly (504) is evenly disposed on the top of the second telescopic column (503), and the outer wall of the internal support assembly (504) is in contact with the inner wall of the part under test (2).

10. The measuring instrument for the hole system bushing part according to claim 9, characterized in that: The internal support component (504) includes: A folding rod (5042) is provided with its outer wall rotatably connected to the top of the second telescopic column (503), and an elastic column (5043) is provided on the opposite side of the folding rod (5042). An electric actuator (5041) is installed on the top of the second telescopic column (503), and the other end of the electric actuator (5041) is connected to the bottom of the folding rod (5042). Anti-slip block (5044) is installed at the end of the folding rod (5042) away from the second telescopic column (503), and the inner wall of the anti-slip block (5044) is rotatably connected to the outer wall of the folding rod (5042).

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