A gas testing tool for precision workpieces

Abstract

The present application relates to a gas testing tool for precision workpieces, and belongs to the technical field of workpiece air tightness detection. It includes a workbench, a bracket is provided on the workbench, a truncated cone is provided on the bracket, a connecting block is provided on the truncated cone, a first sealing ring is provided on the connecting block and between the connecting block and the truncated cone; a clamping block is provided at one end of the connecting block away from the truncated cone, the clamping block passes through a hole on the workpiece, a closing cover is provided on the clamping block and located on the side of the workpiece away from the truncated cone, and a second sealing ring is provided on the surface of the closing cover close to the clamping block; a driving assembly is provided on the connecting block, and the driving assembly is used to drive the connecting block to move in a direction close to the truncated cone. The present application facilitates air tightness detection around workpiece holes.

Description

Technical Field

[0001] The present application relates to the technical field of workpiece air tightness detection, and in particular to a gas tightness detection tool for precision workpieces. Background Art

[0002] In current production, many product workpieces need to be tested for sealing before leaving the factory to prevent defective products from entering the market. During the testing process, each hole of the workpiece is sealed, and then a certain pressure of gas is injected into the workpiece. After a period of time, it is tested whether the gas pressure inside the part is within the required range.

[0003] In the process of realizing the present application, the inventors found that the above technology has at least the following problems: the device is not convenient for airtightness detection around the holes of the workpiece. Summary of the invention

[0004] In order to facilitate the air tightness detection around the holes of a workpiece, the present application provides a gas tightness testing tool for a precision workpiece.

[0005] The present application provides a precision workpiece gas testing tool that adopts the following technical solution:

[0006] A pneumatic testing tool for precision workpieces, comprising a workbench, a bracket is provided on the workbench, a truncated table is provided on the bracket, a connecting block is provided on the truncated table, a first sealing ring is provided on the connecting block and between the connecting block and the truncated table; a clamping block is provided at one end of the connecting block away from the truncated table, the clamping block passes through a hole on the workpiece, a closing cover is provided on the clamping block and located on a side of the workpiece away from the truncated table, a second sealing ring is provided on the surface of the closing cover close to the clamping block; a driving assembly is provided on the connecting block, the driving assembly is used to drive the connecting block to move in a direction close to the truncated table.

[0007] By adopting the above technical solution, the driving component drives the connecting block to move in the direction close to the truncated cone, and the connecting block and the truncated cone squeeze the first sealing ring. After squeezing, the first sealing ring is deformed and presses against the inner wall of the workpiece; and the closing cover presses against the workpiece under the pull of the driving component, and the second sealing ring presses against the periphery of the hole of the workpiece, so that the area between the first sealing ring and the second sealing ring on the workpiece is in a sealed state, that is, the area around the hole on the workpiece is in a sealed state; then gas is injected into the area between the first sealing ring and the second sealing ring on the workpiece and the air pressure is tested. This structure facilitates airtightness detection around the hole of the workpiece.

[0008] In a specific possible implementation manner, a clearance hole is provided on the closing cover, and the clearance hole is used for the clamping block to pass through, and the clamping block abuts against the inner surface of the closing cover.

[0009] By adopting the above technical solution, the snap-in block is inserted into the snap-in block through the clearance hole, and the cover is rotated, and then the connecting block is driven by the driving component to move in the direction close to the truncated table. The connecting block drives the snap-in block to move together, so that the snap-in block abuts against the side wall around the hole of the workpiece, thereby realizing a sealed connection between the cover and the workpiece.

[0010] In a specific feasible implementation scheme, a clearance groove is provided on the circular platform, one end of the connecting block is inserted into the clearance groove, and the other end of the connecting block extends out of the clearance groove; a convex ring is provided on the side wall of the connecting block and located on the outside of the clearance groove, and the first sealing ring is located between the convex ring and the connecting block.

[0011] By adopting the above technical solution, when the driving assembly drives the connecting block to move in the direction close to the truncated cone, the connecting block will move in the direction of inserting into the clearance groove, and the convex ring and the connecting block will squeeze the first sealing ring, causing the first rubber tube to deform and extend from between the convex ring and the connecting block to press against the inner wall of the workpiece, thereby achieving a sealed connection with the workpiece.

[0012] In a specific possible implementation scheme, the drive assembly includes a motor and a screw, the motor is located on a side of the bracket away from the truncated table, the motor is coaxially connected to the screw, the screw passes through the bracket and the truncated table and is threadedly connected to the connecting block.

[0013] By adopting the above technical solution, when the motor drives the screw rod to rotate, the connecting block will be displaced on the screw rod, thereby driving the connecting block to rotate.

[0014] In a specific possible implementation scheme, a guide rod extends from the inner surface of the clearance groove, the guide rod is arranged along the length direction of the screw rod, and a guide groove is opened on the connecting block, and the guide rod is inserted into the guide groove.

[0015] By adopting the above technical solution, when the screw drives the connecting block to move in the direction of inserting into the give way groove, the guide rod will be inserted into the guide groove, and the guide rod will guide the displacement of the connecting block, thereby preventing the connecting block from rotating with the screw rod around the screw rod axis as the center line.

[0016] In a specific possible implementation scheme, a displacement plate is provided at one end of the closing cover away from the connecting block, and the displacement plate is rotatably connected to the closing cover; a bearing plate is provided on the bracket, a slide rail is provided on the bearing plate, and the top end of the displacement plate is slidably matched with the slide rail.

[0017] By adopting the above technical solution, the driving component drives the clamping block to move in the direction away from the truncated table, so that the connection between the clamping block and the closing cover is loosened. Then the closing cover is rotated and the displacement plate is pulled. The displacement plate will slide on the slide rail, so that the clamping block can be pulled out from the clearance groove of the closing cover, which is convenient for replacing the workpiece.

[0018] In a specific possible implementation scheme, one end of the carrying plate is hinged to the top end of the bracket, an extension plate is provided on the bracket and on one side of the carrying plate, and a push-pull cylinder is hinged between the extension plate and the carrying plate.

[0019] By adopting the above technical solution, after the closing cover is disassembled from the clamping block, the extension and retraction of the push-pull cylinder will drive the bearing plate to rotate, and lift up the bearing plate, so as to facilitate the replacement of the workpiece.

[0020] In a specific possible implementation manner, an abutment plate is provided at one end of the carrying plate, and the abutment plate abuts against the bracket.

[0021] By adopting the above technical solution, the load-bearing plate is hinged to the top end of the bracket, and the abutting plate abuts against the bracket, which helps to strengthen the connection between the load-bearing plate and the bracket.

[0022] In a specific possible implementation scheme, the displacement plate includes a slide plate and a plate sleeve, wherein one end of the plate sleeve is slidably matched with the slide rail, and the other end of the plate sleeve is provided with a receiving groove; one end of the slide plate is inserted into the receiving groove, and the other end of the slide plate extends out from the receiving groove, and the slide plate is slidably matched with the plate sleeve; one end of the slide plate and located in the receiving groove is connected to a limiting plate, and the limiting plate is in contact with the inner surface of the open end of the receiving groove; a fixing piece is provided at one end of the receiving groove away from the slide plate, and the fixing piece is used to fix the position of the limiting plate.

[0023] By adopting the above technical solution, the slide plate is pushed and inserted into the accommodating groove, and the cover will also move toward the plate sleeve, and the position of the slide plate is fixed by the fixing member to avoid hitting other surrounding objects in the process of lifting the supporting plate.

[0024] In a specific feasible implementation scheme, a accommodating cavity is provided in the plate sleeve, the fixing piece is a marble, one end of the marble passes through the inner surface of the accommodating groove and is inserted into the accommodating cavity, and the other end of the marble extends out from the accommodating cavity; a groove is provided on the limiting plate, and the end of the marble located outside the accommodating cavity is used to extend into the groove; a spring is provided between the marble and the inner surface of the accommodating cavity.

[0025] By adopting the above-mentioned technical solution, the slide plate is pushed in the direction of inserting into the accommodating groove, so that the limit plate moves in the direction close to the marble, and the limit plate pushes the marble so that the marble is retracted into the accommodating cavity; when the groove on the limit plate is aligned with the marble, the marble extends from the accommodating cavity under the action of the spring, thereby fixing the position of the limit plate and further fixing the position of the slide plate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The driving assembly drives the connecting block to move in the direction close to the truncated cone, and the connecting block and the truncated cone squeeze the first sealing ring. After squeezing, the first sealing ring is deformed and pressed against the inner wall of the workpiece; and the cover is pulled against the workpiece by the driving assembly, and the second sealing ring presses against the periphery of the hole of the workpiece, so that the area between the first sealing ring and the second sealing ring on the workpiece is in a sealed state, that is, the area around the hole on the workpiece is in a sealed state; then, gas is injected into the area between the first sealing ring and the second sealing ring on the workpiece and the gas pressure is tested. This structure facilitates airtightness detection around the hole of the workpiece;

[0028] 2. When replacing the workpiece, loosen the connection between the closing cover and the clamping block through the driving assembly, rotate the closing cover, take out the clamping block from the closing cover, push the slide plate in the direction of the insertion groove, so that the marble is inserted into the groove of the limit plate, thereby fixing the position of the slide plate; finally, drive the bearing plate to move through the push-pull cylinder, lift the bearing plate, and replace the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the workpiece of this application.

[0030] Figure 2 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0031] Figure 3 It is a cross-sectional view of the whole of Example 1 of the present application.

[0032] Figure 4 It is a schematic diagram of the structure of the drive assembly of Example 1 of the present application.

[0033] Figure 5 It is a schematic diagram of the structure of the drive component of Example 2 of the present application.

[0034] Figure 6 It is a schematic diagram of the overall structure of Example 3 of the present application.

[0035] Figure 7 It is a cross-sectional view of the displacement plate of Example 3 of the present application.

[0036] Figure 8 yes Figure 7 A partial enlarged view of part A.

[0037] Explanation of the reference numerals: 1. workpiece; 11. recessed portion; 12. hole; 2. workbench; 3. bracket; 31. extension plate; 311. through groove; 32. push-pull cylinder; 4. truncated cone; 41. first sealing ring; 42. clearance groove; 43. guide rod; 5. connecting block; 51. convex ring; 52. threaded groove; 53. guide groove; 54. snap-in block; 6. closing cover; 61. second sealing ring; 62. cavity; 63. clearance hole; 64. connecting rod; 65. bearing; 7. driving assembly; 71. retracting cylinder; 72. motor; 73. screw rod; 8. bearing plate; 81. abutment plate; 82. slide rail; 9. displacement plate; 91. slide plate; 911. limit plate; 912. groove; 92. plate sleeve; 921. accommodating groove; 922. accommodating cavity; 93. marble; 94. spring. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings.

[0039] The embodiment of the present application discloses a pneumatic testing tool for precision workpieces.

[0040] Reference Figure 1 The workpiece 1 for air tightness testing includes a recessed portion 11, and a hole 12 is formed on the inner wall of the recessed portion 11. The air tightness testing tool for precision workpieces involved in the present application is used to perform air tightness testing around the hole 12 of the workpiece 1, that is, the recessed portion 11 of the workpiece 1.

[0041] Example 1

[0042] Reference Figure 2 and Figure 3 The pneumatic testing tooling for precision workpieces includes a workbench 2, a bracket 3 is placed on the workbench 2, a truncated cone 4 is arranged on the side wall of the bracket 3, a connecting block 5 is arranged on the truncated cone 4, a first sealing ring 41 is clamped between the connecting block 5 and the truncated cone 4; a clamping block 54 is connected to the end of the connecting block 5 away from the truncated cone 4, the clamping block 54 extends into the recessed portion 11 on the workpiece 1, and extends into the workpiece through the hole 12; a closing cover 6 is arranged on the clamping block 54, and a second sealing ring 61 is arranged on the side wall of the closing cover 6; a driving assembly 7 is arranged on the connecting block 5, and the driving assembly 7 is used to drive the connecting block 5 to move in a direction close to the truncated cone 4.

[0043] Reference Figure 2 and Figure 3When testing the air tightness around the hole 12 on the workpiece 1, the driving assembly 7 drives the connecting block 5 to move toward the truncated cone 4, and the first sealing ring 41 is squeezed by the connecting block 5 and the truncated cone 4 to deform and abut against the inner wall of the recessed portion 11. At the same time, the second sealing ring 61 abuts against the hole 12 on the workpiece 1. Then, gas is injected into the area between the first sealing ring 41 and the second sealing ring 61 in the recessed portion 11 and the gas pressure is tested, so as to perform an air tightness test around the hole 12 of the workpiece 1.

[0044] Reference Figure 4 A clearance groove 42 is provided on the side wall of the truncated cone 4, one end of the connecting block 5 is inserted into the clearance groove 42, and the other end of the connecting block 5 extends out from the clearance groove 42. A convex ring 51 is integrally formed on the outer side of the connecting block 5, the convex ring 51 is located outside the clearance groove 42, and the first sealing ring 41 is located between the convex ring 51 and the truncated cone 4. The driving assembly 7 includes a retracting cylinder 71, which is fixed to the bracket 3, and the output shaft of the retracting cylinder 71 passes through the bracket 3 and the truncated cone 4, extends into the clearance groove 42 and is connected to the connecting block 5. The connecting block 5 is pulled in the direction of inserting into the clearance groove 42 by the retracting cylinder 71, and the convex ring 51 on the connecting block 5 and the truncated cone 4 squeeze the first sealing ring 41.

[0045] Reference Figure 3 and Figure 4 , a cavity 62 is provided in the closing cover 6, and a clearance hole 63 is provided on the side wall of the closing cover 6 close to the workpiece 1, and the clearance hole 63 is used for the clamping block 54 to extend into. An annular groove is provided on the side wall of the closing cover 6 and around the clearance hole 63, and the second sealing ring 61 is located in the annular groove. After the clamping block 54 is inserted into the cavity 62 of the closing cover 6 through the clearance hole 63, the closing cover 6 is rotated, and the connecting block 5 is driven by the contraction cylinder 71 to move in the direction close to the truncated table 4, and the clamping block 54 will move in the same direction together, and the clamping block 54 will abut on the inner side wall of the closing cover 6 close to the workpiece 1. Driven by the clamping block 54, the closing cover 6 will also move in the direction close to the workpiece 1, so that the second sealing ring 61 on the closing cover 6 is tightly against the workpiece 1. The second sealing ring 61 is located around the hole 12 on the workpiece 1. When the second sealing ring 61 is tightly against the workpiece 1, the hole 12 on the workpiece 1 is sealed.

[0046] The implementation principle of Example 1 is as follows: when the air tightness test is performed on the concave portion 11 on the workpiece 1, the workpiece 1 is placed on the workbench 2, and the clamping block 54 is inserted into the cavity 62 of the cover 6 through the clearance hole 63, and the cover 6 is rotated. Then, the connecting block 5 is driven to move in the direction of inserting into the clearance groove 42 by the contraction cylinder 71, and the clamping block 54 will abut against the inner wall of the cover 6 close to the workpiece 1, and drive the cover 6 to move together, so that the cover 6 abuts against the inner wall of the workpiece 1, and then the second sealing ring 61 on the cover 6 abuts against the workpiece 1; at the same time, the convex ring 51 and the truncated cone 4 squeeze the first sealing ring 41, so that the first sealing ring 41 is deformed, and the side wall of the first sealing ring 41 extends from the area between the convex ring 51 and the truncated cone 4 under the squeezing and abuts against the inner side wall of the concave portion 11. Then, gas is released into the recessed portion 11 of the workpiece 1 and into the area between the first sealing ring 41 and the second sealing ring 61 , so as to perform an airtightness test around the hole 12 of the workpiece 1 .

[0047] Example 2

[0048] Reference Figure 5 , the difference between this embodiment and embodiment 1 is that the driving assembly 7 includes a motor 72 and a screw rod 73, the motor 72 is fixed on the bracket 3, and the motor 72 is coaxially connected with the screw rod 73. A thread groove 52 is provided at one end of the connecting block 5 located in the clearance groove 42, and the end of the screw rod 73 away from the motor 72 penetrates the bracket 3 and the round table 4 and is threadedly connected in the thread groove 52 of the connecting block 5. A plurality of guide rods 43 extend from the inner surface of the clearance groove 42. In this embodiment, two guide rods 43 extend, and each guide rod 43 is arranged along the length direction of the screw rod 73. A guide groove 53 corresponding to the guide rod 43 is provided on the connecting block 5, and each guide rod 43 is inserted into the corresponding guide groove 53. The motor 72 can drive the screw rod 73 to rotate. Since the guide rod 43 and the guide groove 53 play a guiding role in the movement of the connecting block 5, the connecting block 5 can be displaced along the length direction of the screw rod 73, and the connecting block 5 is prevented from rotating with the screw rod 73 as much as possible.

[0049] The implementation principle of Example 2 is as follows: the motor 72 drives the screw rod 73 to rotate, and the connecting block 5 can move in the direction of inserting into the clearance groove 42 under the cooperation of the guide rod 43 and the guide groove 53, and the connecting block 5 drives the convex ring 51 to move together, thereby causing the convex ring 51 and the round table 4 to squeeze the second rubber ring.

[0050] Example 3

[0051] Reference Figure 6, the difference between this embodiment and the embodiment 1 and the embodiment 2 is that a bearing plate 8 is hingedly connected to the top of the bracket 3, and an abutting plate 81 extends from the bottom of the bearing plate 8. The abutting plate 81 is arranged in the vertical direction and abuts against the side wall of the bracket 3 to support the bearing plate 8 and keep the bearing plate 8 horizontal. A plurality of slide rails 82 are arranged on the bottom of the bearing plate 8. In this embodiment, two slide rails 82 are arranged, and each slide rail 82 is arranged along the length direction of the bearing plate 8. A displacement plate 9 is connected between the closing cover 6 and the bearing plate 8, and the top of the displacement plate 9 is slidably matched with the slide rail 82; the end of the closing cover 6 away from the connecting block 5 is connected to a connecting rod 64, and a bearing 65 is fixed on the connecting rod 64. The connecting rod 64 is rotatably connected to the displacement plate 9 through the bearing 65. When replacing the workpiece 1, the closing cover 6 is rotated, and then the displacement plate 9 is slid, so that the closing cover 6 can be removed from the clamping block 54, and the closing cover 6 will be fixed on the displacement plate 9, which helps to save manpower for replacing the workpiece 1.

[0052] Reference Figure 6 An extension plate 31 is provided at the top of the bracket 3 and on one side of the carrier plate 8. A through slot 311 is provided on the extension plate 31. A push-pull cylinder 32 is hinged between the inner surface of the top of the through slot 311 and the carrier plate 8. The push-pull cylinder 32 can drive the carrier plate 8 to rotate, so that the carrier plate 8 can be lifted when the workpiece 1 is replaced.

[0053] Reference Figure 6 and Figure 7 The displacement plate 9 includes a slide plate 91 and a plate sleeve 92, wherein one end of the plate sleeve 92 is slidably matched with the slide rail 82, and the other end of the plate sleeve 92 is provided with a receiving groove 921; one end of the slide plate 91 is inserted into the receiving groove 921 and connected with a limiting plate 911, and the limiting plate 911 is against the inner surface of the open end of the receiving groove 921; the other end of the slide plate 91 extends out from the receiving groove 921, and the slide plate 91 is slidably matched with the plate sleeve 92, and the cover 6 is arranged on the slide plate 91. A fixing piece is arranged at one end of the receiving groove 921 away from the slide plate 91, and the fixing piece is used to fix the position of the limiting plate 911. When it is necessary to lift the supporting plate 8, the slide plate 91 is pushed into the receiving groove 921, and the position of the slide plate 91 is fixed by the fixing piece, so as to reduce the length of the displacement plate 9 and avoid hitting other objects as much as possible during the lifting process of the supporting plate 8.

[0054] Reference Figure 7 and Figure 8, a receiving cavity 922 is provided inside the plate sleeve 92 and on both sides of the slide plate 91, and each receiving cavity 922 corresponds to a fixing member. In this embodiment, the fixing member is a marble 93, and a groove 912 for the marble 93 to extend into is provided on the limiting plate 911; one end of the marble 93 is located in the receiving cavity 922, and the other end of the marble 93 passes through the inner side wall of the receiving cavity 922 and extends out of the receiving cavity 922; a spring 94 is connected inside the receiving cavity 922 and between the marble 93 and the inner side wall of the receiving cavity 922. When the slide plate 91 moves in the direction of being inserted into the accommodating groove 921, the limit plate 911 pushes the marble 93, causing the marble 93 to shrink into the accommodating chamber 922. When the marble 93 is aligned with the groove 912, the marble 93 extends out from the accommodating chamber 922 under the action of the spring 94 and is inserted into the corresponding groove 912, thereby fixing the limit plate 911 and further fixing the position of the slide plate 91.

[0055] The implementation principle of the embodiment 3 is as follows: when the workpiece 1 needs to be replaced, the cover 6 is rotated to align the clearance hole 63 on the cover 6 with the clamping block 54, and then the displacement plate 9 is slid to pull the clamping block 54 out of the cover 6. Then the slide plate 91 is pushed into the plate sleeve 92, the position of the slide plate 91 is fixed by the marble 93, and the bearing plate 8 is driven to rotate by the push-pull cylinder 32, and then the bearing plate 8 is lifted up so that the workpiece 1 can be replaced.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas testing tool for precision workpieces, characterized by: The invention comprises a workbench (2), wherein a bracket (3) is arranged on the workbench (2), a truncated table (4) is arranged on the bracket (3), a connecting block (5) is arranged on the truncated table (4), a first sealing ring (41) is arranged on the connecting block (5) and between the connecting block (5) and the truncated table (4); a clamping block (54) is arranged at one end of the connecting block (5) away from the truncated table (4), the clamping block (54) passes through a hole (12) on a workpiece (1), a closing cover (6) is arranged on the side of the clamping block (54) away from the truncated table (4), and a second sealing ring (61) is arranged on the surface of the closing cover (6) close to the clamping block (54); a driving assembly (7) is arranged on the connecting block (5), and the driving assembly (7) is used to drive the connecting block (5) to move in a direction close to the truncated table (4); The truncated cone (4) is provided with a clearance groove (42), one end of the connecting block (5) is inserted into the clearance groove (42), and the other end of the connecting block (5) extends out from the clearance groove (42); a convex ring (51) is provided on the side wall of the connecting block (5) and located outside the clearance groove (42), and the first sealing ring (41) is located between the convex ring (51) and the connecting block (5); A displacement plate (9) is provided at one end of the closing cover (6) away from the connecting block (5), and the displacement plate (9) is rotatably connected to the closing cover (6); a bearing plate (8) is provided on the bracket (3), and a slide rail (82) is provided on the bearing plate (8), and the top end of the displacement plate (9) is slidably matched with the slide rail (82); One end of the bearing plate (8) is hinged to the top end of the bracket (3); an extension plate (31) is provided on the bracket (3) and located on one side of the bearing plate (8); a push-pull cylinder (32) is hinged between the extension plate (31) and the bearing plate (8); The displacement plate (9) comprises a slide plate (91) and a plate sleeve (92), wherein one end of the plate sleeve (92) is slidably matched with the slide rail (82), and the other end of the plate sleeve (92) is provided with a receiving groove (921); one end of the slide plate (91) is inserted into the receiving groove (921), and the other end of the slide plate (91) extends out from the receiving groove (921), and the slide plate (91) is slidably matched with the plate sleeve (92); one end of the slide plate (91) located in the receiving groove (921) is connected to a limiting plate (911), and the limiting plate (911) contacts the inner surface of the open end of the receiving groove (921); a fixing piece is provided at one end of the receiving groove (921) away from the slide plate (91), and the fixing piece is used to fix the position of the limiting plate (911).

2. The pneumatic testing tool for precision workpieces according to claim 1, characterized in that: The closing cover (6) is provided with a clearance hole (63), the clearance hole (63) is used for the clamping block (54) to pass through, and the clamping block (54) abuts against the inner surface of the closing cover (6).

3. The pneumatic testing tool for precision workpieces according to claim 1, characterized in that: The driving assembly (7) comprises a motor (72) and a screw rod (73); the motor (72) is located on a side of the bracket (3) away from the truncated table (4); the motor (72) is coaxially connected to the screw rod (73); the screw rod (73) passes through the bracket (3) and the truncated table (4) and is threadedly connected to the connecting block (5).

4. The pneumatic testing tool for precision workpieces according to claim 3, characterized in that: A guide rod (43) extends from the inner surface of the clearance groove (42), and the guide rod (43) is arranged along the length direction of the screw rod (73). A guide groove (53) is opened on the connecting block (5), and the guide rod (43) is inserted into the guide groove (53).

5. The pneumatic testing tool for precision workpieces according to claim 1, characterized in that: An abutment plate (81) is provided at one end of the bearing plate (8), and the abutment plate (81) abuts against the bracket (3).

6. The pneumatic testing tool for precision workpieces according to claim 1, characterized in that: The plate sleeve (92) is provided with a receiving cavity (922), the fixing member is a marble (93), one end of the marble (93) passes through the inner surface of the receiving groove (921) and is inserted into the receiving cavity (922), and the other end of the marble (93) extends out from the receiving cavity (922); a groove (912) is provided on the limiting plate (911), and one end of the marble (93) located outside the receiving cavity (922) is used to extend into the groove (912); a spring (94) is provided between the marble (93) and the inner surface of the receiving cavity (922).

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