Connecting rod pressurizing jig for air tightness test

Abstract

The utility model discloses a connecting rod pressurizing jig for air tightness testing, which is used for air tightness testing of workpieces and comprises a workbench, a bottom plate, a pneumatic assembly, a loosening and clamping assembly and a detection assembly. The bottom plate is fixed on the workbench, the pneumatic assembly is installed on the bottom surface of the bottom plate, the loosening and clamping assembly is installed on the top surface of the bottom plate, the pneumatic assembly is in linkage connection with the loosening and clamping assembly, and the detection assembly is in pneumatic connection with the pneumatic assembly and the loosening and clamping assembly; a workpiece is placed in the clamping loosening assembly, when the pneumatic assembly controls the clamping loosening assembly to conduct clamping and sealing operation on the workpiece, the detection assembly controls the amount of gas input by the pneumatic assembly, airtightness testing is conducted on the workpiece, and an air pressure result is displayed. After the test is completed, the pneumatic assembly controls the loosening and clamping assembly to perform loosening and air releasing operation on the workpiece. The problem that there is no tool for testing the air tightness of a workpiece with two sides riveted is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a connecting rod pressurizing fixture for air tightness testing. Background Art

[0002] Airtightness testing is a critical quality control tool widely used in multiple industries (such as automotive, aviation, shipbuilding, pharmaceuticals, and food). It is primarily used to assess the tightness and integrity of workpieces or containers, ensuring that they will not fail or otherwise suffer adverse consequences due to insufficient airtightness during actual use. However, industrial production requires a simple, efficient, and reliable solution that can accurately determine the quality of workpieces while reducing the workload for operators.

[0003] At present, it is necessary to rivet a workpiece with two sides (such as Figure 1 As shown in the figure, a workpiece is tested for air tightness using a differential pressure method. Three holes 110 are located on the top of the workpiece, with a groove 120 located at the top of each hole. Two rivets 140 are installed in the corresponding rivet holes 130, each on the left and right sides of the workpiece. The workpiece must be leak-free for 10 minutes at 10 bar, requiring testing under high pressure. However, there is currently no fixture suitable for testing air tightness on workpieces with rivets on both sides.

[0004] Therefore existing technology still needs to be improved and improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a connecting rod pressurizing fixture for air tightness testing, so as to solve the problem that there is no fixture for air tightness testing of workpieces with riveted rivets on both sides.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A connecting rod pressurizing fixture for air tightness testing is used to perform air tightness testing on a workpiece, comprising a workbench, a base plate, a pneumatic assembly, a clamping assembly, and a detection assembly; the base plate is fixed to the workbench, the pneumatic assembly is mounted on the bottom surface of the base plate, the clamping assembly is mounted on the top surface of the base plate, the pneumatic assembly is linked to the clamping assembly, and the detection assembly is pneumatically connected to the pneumatic assembly and the clamping assembly;

[0008] The workpiece is placed in the loosening and clamping assembly. When the pneumatic assembly controls the loosening and clamping assembly to clamp and seal the workpiece, the detection assembly controls the pneumatic assembly to input gas, perform an air tightness test on the workpiece and display the air pressure result. After the test is completed, the pneumatic assembly controls the loosening and clamping assembly to loosen and deflate the workpiece.

[0009] In the connecting rod pressurizing fixture for air tightness testing, the pneumatic component includes a first hand-panel valve, a second hand-panel valve, a cylinder, several air pipes and several air pipe joints; the first hand-panel valve and the second hand-panel valve are respectively fixed on the upper parts of two opposite supporting feet of the workbench, and the cylinder is fixed on the bottom surface of the base plate. The air inlets of the first hand-panel valve and the second hand-panel valve are pneumatically connected to the gas through corresponding air pipes and air pipe joints, and the air outlet of the first hand-panel valve is pneumatically connected to the detection component through the corresponding air pipe and air pipe joint. The air outlet of the second hand-panel valve is pneumatically connected to the upper and lower air inlets of the cylinder through the corresponding air pipe and air pipe joint, and the piston of the cylinder extends from the through hole on the base plate to connect the loosening assembly.

[0010] In the connecting rod pressurizing fixture for air tightness testing, the air inlet of the first hand valve is connected to one end of the first air pipe through the first air pipe joint, the other end of the first air pipe is connected to the external gas, the first air outlet of the first hand valve is connected to one end of the second air pipe through the second air pipe joint, the other end of the second air pipe is connected to the detection component through the third air pipe joint, the second air outlet of the first hand valve is empty, one end of the fifth air pipe is connected to the detection component through the fourth air pipe joint, the other end of the fifth air pipe is connected to the loosening component through the fifth air pipe joint, one end of the sixth air pipe is connected to the loosening component through the sixth air pipe joint, and the other end of the sixth air pipe is connected to the detection component.

[0011] In the connecting rod pressurizing fixture for air tightness testing, the air inlet of the second hand valve is connected to one end of the third air pipe through the seventh air pipe joint, and the other end of the third air pipe is connected to the external gas, the first air outlet of the second hand valve is connected to one end of the fourth air pipe through the eighth air pipe joint, and the other end of the fourth air pipe is connected to the lower air inlet of the cylinder through the ninth air pipe joint, the second air outlet of the second hand valve is connected to one end of the seventh air pipe through the tenth air pipe joint, and the other end of the seventh air pipe is connected to the upper air inlet of the cylinder through the eleventh air pipe joint.

[0012] In the connecting rod pressurizing jig for air tightness testing, the loosening assembly includes a connecting rod mechanism, a jig guide plate, two guide columns, two support columns and a jig pressure plate; the fixed rod of the connecting rod mechanism is installed on the piston of the cylinder, the two lower connection points of the connecting rod mechanism are respectively fixed in the two mounting holes on the base plate, the two upper connection points of the connecting rod mechanism are respectively fixed in the two mounting holes on the bottom surface of the jig guide plate, the two support columns are respectively fixed on both sides of the base plate, one end of the two guide columns are respectively fixed on both sides of the base plate and located on the inner side of the support columns, the other ends of the two guide columns extend from the through holes opened on both ends of the jig guide plate, the jig pressure plate is installed on the top of the two support columns, the air inlet of the jig pressure plate is connected to the other end of the fifth air pipe through the fifth air pipe joint, and the air outlet of the jig pressure plate is connected to one end of the sixth air pipe through the sixth air pipe joint.

[0013] In the connecting rod pressurizing fixture for air tightness testing, the loosening and clamping assembly also includes several sealing rings, which are installed in the grooves on the bottom surface of the fixture pressure plate; when the fixture pressure plate presses the workpiece, each sealing ring is tightly attached to the grooves on each hole on the top of the workpiece.

[0014] In the connecting rod pressurizing fixture for air tightness testing, the detection assembly includes a first pressure gauge, a second pressure gauge and a three-way joint; the first pressure gauge and the second pressure gauge are screwed and fixed in the gauge holes on the base plate, and the three-way joint is arranged below the base plate; the air inlet of the three-way joint is connected to the other end of the second air pipe through the third air pipe joint, the first air outlet of the three-way joint is connected to the air inlet at the bottom of the first pressure gauge, the second air outlet of the three-way joint is connected to one end of the fifth air pipe through the fourth air pipe joint, and the air inlet at the bottom of the second pressure gauge is connected to the other end of the sixth air pipe.

[0015] In the connecting rod pressurizing fixture for air tightness testing, the workbench is a quadripod, and a suction cup is provided at the bottom of each of the four legs.

[0016] In the connecting rod pressurizing fixture for air tightness testing, the handle of the first hand valve is located at the bottom, and the handle of the second hand valve is located at the top.

[0017] In the connecting rod pressurizing fixture for air tightness testing, the connecting rod mechanism is a multi-link mechanism or a composite connecting rod mechanism.

[0018] Compared to the existing technology, the present invention provides a connecting rod pressurizing fixture for air tightness testing, which is used to perform air tightness testing on workpieces. The fixture comprises a workbench, a base plate, a pneumatic assembly, a clamping assembly, and a detection assembly. The base plate is fixed to the workbench, the pneumatic assembly is mounted on the bottom surface of the base plate, the clamping assembly is mounted on the top surface of the base plate, the pneumatic assembly is linked to the clamping assembly, and the detection assembly is pneumatically connected to the pneumatic assembly and the clamping assembly. The workpiece is placed in the clamping assembly, and the pneumatic assembly controls the clamping assembly to clamp and seal the workpiece. The detection assembly controls the amount of gas input by the pneumatic assembly, performs an air tightness test on the workpiece, and displays the air pressure result. After the test is completed, the pneumatic assembly controls the clamping assembly to loosen and deflate the workpiece. This solves the problem that there is no existing fixture for air tightness testing of workpieces riveted on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic structural diagram of a workpiece with existing double-sided riveting.

[0020] Figure 2 This is an exploded diagram of the structure of the connecting rod pressurizing fixture for air tightness testing provided by the utility model.

[0021] Figure 3This is a structural schematic diagram of the connecting rod pressurizing fixture for air tightness testing provided by the utility model from a first perspective.

[0022] Figure 4 This is a structural schematic diagram of the connecting rod pressurizing fixture for air tightness testing provided by the utility model from a second perspective.

[0023] Figure 5 This is a schematic structural diagram from a third perspective of the connecting rod pressurizing fixture for air tightness testing provided by the utility model.

[0024] Figure 6 This is a schematic structural diagram from a fourth perspective of the connecting rod pressurizing fixture for air tightness testing provided by the present invention.

[0025] Figure 7 This is a schematic diagram of the pressure gauge in the connecting rod pressurizing fixture for air tightness testing provided by the present invention.

[0026] Figure 8 This is a partial structural schematic diagram of the connecting rod pressure fixture provided by the utility model when clamping.

[0027] Figure 9 This is a partial structural schematic diagram of the connecting rod pressure fixture provided by the utility model when it is loosened. DETAILED DESCRIPTION

[0028] This utility model provides a connecting rod pressurizing fixture for air tightness testing. To clarify and clarify the purpose, technical solution, and effects of this utility model, the following describes this utility model in further detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate this utility model and are not intended to limit it.

[0029] Please also see Figures 2 to 6 The present invention provides a connecting rod pressurizing fixture for air tightness testing, which is used to Figure 1 The workpiece 100 with a riveted structure on both sides shown is subjected to an air tightness test; it includes a workbench 1, a base plate 2, a pneumatic component, a clamping component and a detection component; the base plate 2 is fixed on the workbench 1, the pneumatic component is installed on the bottom surface of the base plate 2, the clamping component is installed on the top surface of the base plate 2, a part of the detection component is installed on the bottom surface of the base plate, and the other part of the detection component is installed on the top surface of the base plate, the pneumatic component is linked to the clamping component, and the detection component is pneumatically connected to the pneumatic component and the clamping component. The workpiece 100 is placed in the clamping component, and when the pneumatic component controls the clamping component to clamp and seal the workpiece 100, the detection component controls the pneumatic component to input gas, performs an air tightness test on the workpiece 100 and displays the air pressure result; after the test is completed, the pneumatic component controls the clamping component to loosen and deflate the workpiece 100.

[0030] In this embodiment, the workbench 1 is a quadripod, and the base plate 2 is fixed to the workbench 1 by four M12 screws. Specifically, a first screw hole 3 is provided on each of the four corners of the base plate 2, and a second screw hole 4 aligned with the position of the first screw hole is provided on each of the four frame corners on the top of the workbench 1. The base plate 2 is placed on the workbench 1, and the first screw hole 3 and the second screw hole 4 are aligned and then the screws are screwed in to fix it.

[0031] In order to prevent the workbench 1 from deforming, a limit strip 5 is provided between two adjacent legs at the lower end of the workbench 1 ; in order to prevent the workbench 1 from moving during the test, a suction cup 6 is provided at the bottom of each of the four legs.

[0032] The pneumatic assembly includes a first hand-panel valve 7, a second hand-panel valve 8, a cylinder 9, several air pipes and several air pipe joints (some air pipe joints are not shown); the first hand-panel valve 7 and the second hand-panel valve 8 are respectively fixed on the upper parts of the two opposite supporting feet (15 and 16) of the workbench 1, and the cylinder 9 is fixed (fixed by 4 screws) on the bottom surface of the base plate 2. The air inlets of the first hand-panel valve 7 and the second hand-panel valve 8 are pneumatically connected to the gas through the corresponding air pipes and air pipe joints, and the air outlet of the first hand-panel valve 7 is pneumatically connected to the detection assembly through the corresponding air pipe and air pipe joint. The air outlet of the second hand-panel valve 8 is pneumatically connected to the upper and lower air inlets of the cylinder 9 through the corresponding air pipe and air pipe joint. The piston of the cylinder 9 extends from the through hole on the base plate 2 to connect to the loosening assembly.

[0033] During the pneumatic connection, specifically: the air inlet of the first hand valve 7 is connected to one end of the first air pipe 11 through the first air pipe joint 10, the other end of the first air pipe 11 is connected to the external gas, the first air outlet of the first hand valve 7 is connected to one end of the second air pipe 13 through the second air pipe joint 12, the other end of the second air pipe 13 is connected to the air inlet of the three-way joint 31 in the detection assembly through the third air pipe joint, the second air outlet of the first hand valve 7 is empty (that is, not connected, to facilitate subsequent deflation and discharge of gas inside the connecting rod pressurizing fixture), one end of the fifth air pipe 18 is connected to the second air outlet of the three-way joint 31 in the detection assembly through the fourth air pipe joint, the other end of the fifth air pipe 18 is connected to the air inlet of the fixture pressure plate 24 in the loosening assembly through the fifth air pipe joint, one end of the sixth air pipe 19 is connected to the air outlet of the fixture pressure plate 24 in the loosening assembly through the sixth air pipe joint, and the other end of the sixth air pipe 19 is directly connected (without an air pipe interface) to the air inlet at the bottom of the second air pressure gauge 30 in the detection assembly.

[0034] The air inlet of the second hand valve 8 is connected to one end of the third air pipe 14 through the seventh air pipe joint, and the other end of the third air pipe 14 is connected to the external gas. The first air outlet of the second hand valve 8 is connected to one end of the fourth air pipe 17 through the eighth air pipe joint, and the other end of the fourth air pipe 17 is connected to the lower air inlet of the cylinder 9 through the ninth air pipe joint. The second air outlet of the second hand valve 8 is connected to one end of the seventh air pipe 33 through the tenth air pipe joint, and the other end of the seventh air pipe 33 is connected to the upper air inlet of the cylinder 9 through the eleventh air pipe joint.

[0035] Among them, the first hand-operated valve 7 is used to control the gas to pass through the corresponding air pipe so that the fixture pressure plate 24 and the workpiece 100 are filled with gas, and the gas is released to the outside; when the handle of the first hand-operated valve 7 is turned, gas enters; after the test is completed, it is turned again, and the internal gas is discharged from the second air outlet of the first hand-operated valve 7. When the handle of the second hand-operated valve 8 is turned, the second hand-operated valve 8 can control the gas to enter the corresponding air inlet of the cylinder 9. When the gas enters from the lower air inlet of the cylinder 9, the piston moves upward, and when the gas enters from the upper air inlet of the cylinder 9, the piston moves downward. In order to facilitate the functions of the two hand-operated valves, the handle of the first hand-operated valve 7 is located at the bottom during installation, and the handle of the second hand-operated valve 8 is located at the top.

[0036] The clamp release assembly includes a connecting rod mechanism 20 (preferably a multi-connecting rod mechanism or a composite connecting rod mechanism, the specific structure of which is as follows Figure 2 or Figure 5 As shown), a jig guide plate 21, two guide pillars 22, two support pillars 23 and a jig pressure plate 24; the fixed rod 25 of the connecting rod mechanism 20 is installed on the piston of the cylinder 9, the two lower connection points 26 of the connecting rod mechanism 20 are respectively fixed in the two mounting holes on the base plate 2 (without passing through the base plate), the two upper connection points 27 of the connecting rod mechanism 20 are respectively fixed in the two mounting holes on the bottom surface of the jig guide plate 21 (without passing through the jig guide plate 21), the two support pillars 23 are respectively fixed in the two mounting holes on the bottom surface of the jig guide plate 21 They are fixed on both sides of the base plate 2, one end of the two guide pillars 22 are respectively fixed on both sides of the base plate 2 and are located on the inner side of the support pillars, the other ends of the two guide pillars 22 extend from the through holes opened on both ends of the jig guide plate 21, and the jig pressure plate 24 is installed on the top of the two support pillars 23. The air inlet of the jig pressure plate 24 is connected to the other end of the fifth air pipe 18 through the fifth air pipe joint 34, and the air outlet of the jig pressure plate 24 is connected to one end of the sixth air pipe 19 through the sixth air pipe joint 35.

[0037] Among them, the support column 23 plays a supporting role, supporting a space between the jig pressure plate 24 and the base plate 2, and the connecting rod mechanism 20 drives the jig guide plate 21 to move up and down in the space. The two guide columns 22 play a role of limiting and guiding the up and down movement of the jig guide plate 21, avoiding position displacement when the jig guide plate 21 moves up and down. The front of the jig guide plate 21 is provided with a receiving cavity 25 for placing the workpiece 100, which plays the role of supporting the workpiece 100. When the connecting rod mechanism 20 drives the jig guide plate 21 to move upward, the workpiece 100 rises together until it is pressed against the bottom surface of the jig pressure plate 24, and air pressure detection can be carried out. When the connecting rod mechanism 20 drives the jig guide plate 21 to move downward, the workpiece 100 descends together and separates from the jig pressure plate 24.

[0038] Preferably, the clamping assembly further includes a plurality of sealing rings 28. The number of the sealing rings 28 is the same as the number of holes on the workpiece 100, which is three in this embodiment. The sealing rings 28 are installed in the three grooves on the bottom surface of the fixture pressing plate 24. The spacing and size of the three grooves are adapted to the three holes on the workpiece. When the fixture pressing plate 24 presses the workpiece, each sealing ring 28 is just in close contact with the grooves on the holes on the top of the workpiece (such as Figure 1 As shown), an effective seal is formed between the fixture pressure plate 24 and the workpiece 100 through the sealing ring 28.

[0039] Preferably, the support column 23 can be a rectangular support column, the width of the outer side of which is equal to the width of the side of the fixture pressing plate 24. It can also be set as 4 cube-shaped support columns (such as Figure 2 and Figure 3 As shown), two support columns form a group and are fixed on the base plate 2 side by side and at a preset distance.

[0040] The detection component includes a first pressure gauge 29, a second pressure gauge 30 and a three-way joint 31; the first pressure gauge 29 and the second pressure gauge 30 are screwed and fixed in the gauge hole 32 on the base plate 2, and the three-way joint 31 is arranged below the base plate 2; the air inlet of the three-way joint 31 is connected to the other end of the second air pipe 13 through the third air pipe joint, the first air outlet of the three-way joint 31 is directly connected (without an air pipe interface) to the air inlet at the bottom of the first pressure gauge 29, the second air outlet of the three-way joint 31 is connected to one end of the fifth air pipe 18 through the fourth air pipe joint, and the air inlet at the bottom of the second pressure gauge 30 is connected to the other end of the sixth air pipe 19.

[0041] Among them, the three-way connector 31 is located below the bottom plate and can be suspended in the air through the corresponding air pipe support. In order to avoid falling, it can also be fixed to the bottom surface of the bottom plate 2. The preferred model of the two pressure gauges is PR20-FB, such as Figure 7As shown, the bottom of the barometer is placed in the gauge hole 32 on the bottom plate 2. The outer ring of the barometer is larger than the gauge hole 32. The three screw holes set on the outer ring are screwed into the bottom plate 2 to achieve screw fixation. The inner ring of the barometer is marked with the air pressure range (a V-shaped) and an arrow. The swing of the arrow can be used to observe the pressure inside the workpiece. The three-way connector 30 is used to divert the gas, allowing the gas to enter the first barometer directly on one path and enter the fixture pressure plate, workpiece 100 and the second barometer on the other.

[0042] The working principle of the connecting rod pressurizing fixture is as follows:

[0043] The workpiece 100 is placed on the jig guide plate 21 and the rivet 140 is inserted into the rivet hole 130 to prevent gas leakage in the inner cavity of the workpiece during testing.

[0044] Connect the gas to the second hand valve 8, turn the handle to allow the gas to enter the second hand valve 8 through the third air pipe 14, and then enter the lower air inlet of the cylinder 9 through the fourth air pipe 17. The piston of the cylinder 9 moves upward, driving the connecting rod mechanism 20 to move upward. The connecting rod mechanism 20 drives the fixture guide plate 21 to move upward and gradually approach the bottom surface of the fixture pressure plate 24. Figure 8 When the cylinder 9 reaches its upper limit, it moves the connecting rod 20 to its dead center position. After the connecting rod 20 is locked, the workpiece is pressed tightly between the jig plate 24 and the jig guide plate 21. The sealing rings 28 on the bottom surface of the jig plate 24 fit snugly into the grooves in the holes at the top of the workpiece.

[0045] At this point, 10 bar of gas, controlled by the first hand valve 7, enters the first hand valve 7 through the first air pipe 11, then enters the three-way connector 30 through the second air pipe. One path of gas directly enters the first pressure gauge 29; another path of gas enters the air inlet of the fixture pressure plate 24 through the fifth air pipe. The interior of the workpiece 100 in the fixture pressure plate 24 is filled with gas (the gas enters from a hole on the outermost side of the workpiece and exits from a hole on the other side). The gas then enters the second pressure gauge 30 through the sixth air pipe. Observe the pointers on the two pressure gauges. As long as the pointers are within the marked air pressure range, the workpiece has passed the air tightness test. If the pointer of either pressure gauge is not within the air pressure range, the workpiece has a leak.

[0046] After the test is completed, the first hand valve 7 is turned, the gas input stops, and the internal gas is discharged in the reverse flow according to the above-mentioned entry method: the gas in the first pressure gauge enters the three-way joint 31; the gas in the second pressure gauge enters the fixture pressure plate 24 through the sixth air pipe, and the gas in the fixture pressure plate 24 and the workpiece also enters the three-way joint 31 through the fifth air pipe; the gas in the three-way joint 31 enters the first hand valve 7 through the second air pipe, and the pressure is released and the air is released from the second air outlet of the first hand valve 7.

[0047] Then turn the second hand valve 8, and the gas enters the upper air inlet of the cylinder 9, as shown in FIG. Figure 9 As shown, the cylinder 9 moves downward, driving the connecting rod mechanism 20 to move downward, and the fixture guide plate 21 moves downward synchronously, so that the workpiece 100 is separated from the fixture pressure plate 24.

[0048] In summary, the utility model provides a connecting rod pressurizing fixture for air tightness testing, which controls the inlet and outlet of gas through a hand valve to control the up and down movement of the cylinder. When the cylinder moves, it drives the connecting rod mechanism to move, so that when it reaches the upper limit, it is at the dead point position for locking, thereby realizing the process of clamping the workpiece. The marking range on the pressure gauge can be used to quickly determine whether there is an air leakage phenomenon and to determine whether the air tightness of the workpiece is qualified. The connecting rod pressurizing fixture uses the dead point clamping principle of the connecting rod to ensure the stability of the fixture under high pressure, avoiding the problem of air leakage during high-pressure air tightness inspection due to the workpiece not being fully compressed. The cylinder serves as a power source to make clamping faster, more efficient and more stable.

[0049] The division of the above functional modules is only for illustration. In actual applications, the above functions can be assigned to different functional modules as needed, that is, divided into different functional modules to complete all or part of the functions described above.

[0050] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A connecting rod pressurizing fixture for air tightness testing, used for air tightness testing of workpieces, characterized in that: It includes a workbench, a base plate, a pneumatic assembly, a clamping assembly and a detection assembly; the base plate is fixed on the workbench, the pneumatic assembly is installed on the bottom surface of the base plate, the clamping assembly is installed on the top surface of the base plate, the pneumatic assembly is linked to the clamping assembly, and the detection assembly is pneumatically connected to the pneumatic assembly and the clamping assembly; The workpiece is placed in the loosening and clamping assembly. When the pneumatic assembly controls the loosening and clamping assembly to clamp and seal the workpiece, the detection assembly controls the pneumatic assembly to input gas, perform an air tightness test on the workpiece and display the air pressure result. After the test is completed, the pneumatic assembly controls the loosening and clamping assembly to loosen and deflate the workpiece.

2. The connecting rod pressurizing fixture for air tightness testing according to claim 1, characterized in that: The pneumatic assembly includes a first hand-panel valve, a second hand-panel valve, a cylinder, several air pipes and several air pipe joints; the first hand-panel valve and the second hand-panel valve are respectively fixed on the upper parts of two opposite supporting legs of the workbench, and the cylinder is fixed on the bottom surface of the base plate. The air inlets of the first hand-panel valve and the second hand-panel valve are pneumatically connected to the gas through corresponding air pipes and air pipe joints, the air outlet of the first hand-panel valve is pneumatically connected to the detection assembly through the corresponding air pipe and air pipe joint, the air outlet of the second hand-panel valve is pneumatically connected to the upper and lower air inlets of the cylinder through the corresponding air pipe and air pipe joint, and the piston of the cylinder extends from the through hole on the base plate to connect to the loosening assembly.

3. The connecting rod pressurizing fixture for air tightness testing according to claim 2, characterized in that: The air inlet of the first hand valve is connected to one end of the first air pipe through the first air pipe joint, the other end of the first air pipe is connected to the external gas, the first air outlet of the first hand valve is connected to one end of the second air pipe through the second air pipe joint, the other end of the second air pipe is connected to the detection component through the third air pipe joint, the second air outlet of the first hand valve is empty, one end of the fifth air pipe is connected to the detection component through the fourth air pipe joint, the other end of the fifth air pipe is connected to the loosening component through the fifth air pipe joint, one end of the sixth air pipe is connected to the loosening component through the sixth air pipe joint, and the other end of the sixth air pipe is connected to the detection component.

4. The connecting rod pressurizing fixture for air tightness testing according to claim 3, characterized in that: The air inlet of the second hand valve is connected to one end of the third air pipe through the seventh air pipe joint, and the other end of the third air pipe is connected to external gas. The first air outlet of the second hand valve is connected to one end of the fourth air pipe through the eighth air pipe joint, and the other end of the fourth air pipe is connected to the lower air inlet of the cylinder through the ninth air pipe joint. The second air outlet of the second hand valve is connected to one end of the seventh air pipe through the tenth air pipe joint, and the other end of the seventh air pipe is connected to the upper air inlet of the cylinder through the eleventh air pipe joint.

5. The connecting rod pressurizing fixture for air tightness testing according to claim 3, characterized in that: The loosening and clamping assembly includes a connecting rod mechanism, a jig guide plate, two guide columns, two support columns and a jig pressure plate; the fixed rod of the connecting rod mechanism is installed on the piston of the cylinder, the two lower connection points of the connecting rod mechanism are respectively fixed in the two mounting holes on the base plate, the two upper connection points of the connecting rod mechanism are respectively fixed in the two mounting holes on the bottom surface of the jig guide plate, the two support columns are respectively fixed on both sides of the base plate, one end of the two guide columns are respectively fixed on both sides of the base plate and located on the inner side of the support columns, the other ends of the two guide columns extend from the through holes opened on both ends of the jig guide plate, the jig pressure plate is installed on the top of the two support columns, the air inlet of the jig pressure plate is connected to the other end of the fifth air pipe through the fifth air pipe joint, and the air outlet of the jig pressure plate is connected to one end of the sixth air pipe through the sixth air pipe joint.

6. The connecting rod pressurizing fixture for air tightness testing according to claim 5, characterized in that: The clamping assembly further comprises a plurality of sealing rings, which are installed in grooves on the bottom surface of the jig pressure plate. When the jig pressure plate presses the workpiece, each sealing ring is closely attached to the grooves on each hole on the top of the workpiece.

7. The connecting rod pressurizing fixture for air tightness testing according to claim 3, characterized in that: The detection assembly includes a first pressure gauge, a second pressure gauge and a three-way joint; the first pressure gauge and the second pressure gauge are screwed and fixed in the gauge holes on the base plate, and the three-way joint is arranged below the base plate; the air inlet of the three-way joint is connected to the other end of the second air pipe through the third air pipe joint, the first air outlet of the three-way joint is connected to the air inlet at the bottom of the first pressure gauge, the second air outlet of the three-way joint is connected to one end of the fifth air pipe through the fourth air pipe joint, and the air inlet at the bottom of the second pressure gauge is connected to the other end of the sixth air pipe.

8. The connecting rod pressurizing fixture for air tightness testing according to claim 1, characterized in that: The workbench is a four-legged frame, and a suction cup is respectively provided at the bottom of each of the four legs.

9. The connecting rod pressurizing fixture for air tightness testing according to claim 2, characterized in that: The handle of the first hand valve is located at the bottom, and the handle of the second hand valve is located at the top.

10. The connecting rod pressurizing fixture for air tightness testing according to claim 5, characterized in that: The link mechanism is a multi-link mechanism or a compound link mechanism.

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