A new type of helium air tightness detection tool

Abstract

The utility model discloses a novel helium air tightness detection tool, which includes a tool plate, a workpiece positioning seat, a workpiece pressing plate, a clamping cylinder, a clamping mechanism, a first air inlet pipe and a second air inlet pipe; the workpiece positioning seat is installed on the tool plate; the tool plate is provided with a helium channel; the workpiece pressing plate is provided above the workpiece positioning seat; the clamping cylinder is installed on the tool plate, the clamping mechanism is connected to the power output end of the clamping cylinder, and the clamping mechanism and the workpiece pressing plate are matched correspondingly; the clamping cylinder has a first air inlet end and a second air inlet end; the first air inlet pipe is connected to the first air inlet end, a one-way valve is installed on the first air inlet pipe, and the one-way valve is provided with a pneumatic control end; the second air inlet pipe is respectively connected to the second air inlet end and the pneumatic control end. The utility model can use the cylinder driving method to clamp the workpiece pressing plate, which has high speed, high efficiency and convenient operation, and the tool and the workpiece can be put into a vacuum sealing box together, the clamping cylinder can always maintain a clamping state, and the detection accuracy is high.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness testing equipment, in particular to a novel helium air tightness testing tool. Background Art

[0002] Currently, many workpieces (such as liquid-cooled control boxes for car charging piles) require helium air tightness testing.

[0003] In the prior art, the structure of a novel helium air tightness detection tooling includes a tooling plate, a workpiece positioning seat and a workpiece pressure plate. The workpiece positioning seat is installed on the tooling plate, and the workpiece positioning seat is used to support and position the lower end of the workpiece; the tooling plate is provided with a helium channel, and helium can enter the workpiece through the helium channel. The workpiece pressure plate is arranged above the workpiece positioning seat, and is used to press the workpiece downward and seal the upper end of the workpiece. The workpiece pressure plate and the workpiece positioning seat can be locked with each other by bolts.

[0004] The helium air tightness test process is as follows: first, put the entire new helium air tightness test tooling and the workpiece into a vacuum sealing box, and connect the helium tube to the helium channel of the tooling plate; then, evacuate the vacuum sealing box; then, fill the workpiece with helium through the helium tube and the helium channel; finally, use a helium detection instrument to detect whether there is helium in the vacuum sealing box; if helium can be detected, it means that there is helium leakage in the workpiece, the helium air tightness test fails, and the workpiece is defective; if helium cannot be detected, it means that there is no helium leakage in the workpiece, the helium air tightness test passes, and the workpiece air tightness is qualified.

[0005] However, the technical problem with this new type of helium air tightness detection tooling in the prior art is that each time the workpiece is placed between the workpiece positioning seat and the workpiece pressure plate, it is necessary to manually lock the workpiece pressure plate and the workpiece positioning seat with each other using multiple bolts, which is slow, inefficient, inconvenient to operate, and it is easy to have the problem of insufficient tightening of the bolt connection.

[0006] To address this problem, technicians in this field have tried to use a cylinder or other driving method to clamp the workpiece pressure plate. However, since the entire new helium airtightness testing tool and the workpiece need to be placed in a vacuum sealed box together, in the vacuum sealed box, the new helium airtightness testing tool cannot be connected to any compressed air inlet pipe except the helium pipe, and air cannot be discharged into the vacuum sealed box. Therefore, the driving and clamping method of ordinary cylinders cannot be applied to the new helium airtightness testing tool. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a novel helium air tightness detection tool for the above-mentioned deficiencies in the prior art. The tool can use a cylinder-driven pressing method to press a workpiece pressure plate, with high speed, high efficiency, and convenient operation. The workpiece pressure plate has high pressing stability on the workpiece. Moreover, the tool and the workpiece can flow along the production line and be placed in a vacuum sealing box together without connecting to an external compressed air inlet pipe. The pressing cylinder can always maintain a pressing state without exhausting air into the vacuum sealing box, and the detection accuracy is high.

[0008] In order to solve the above technical problems, the technical solution of the utility model is: a new type of helium air tightness detection tooling, including a tooling plate, a workpiece positioning seat, a workpiece pressing plate, a clamping cylinder, a clamping mechanism, a first air inlet pipe and a second air inlet pipe; the workpiece positioning seat is installed on the tooling plate, and the workpiece positioning seat is used to support and position the lower end of the workpiece; the tooling plate is provided with a helium channel, and helium can enter the workpiece through the helium channel; the workpiece pressing plate is arranged above the workpiece positioning seat, and is used to press the workpiece downward and seal the upper end of the workpiece, and the lower end of the workpiece pressing plate is provided with a plurality of second sealing rings, and the upper end of the workpiece can abut against the lower side of the second sealing ring; the clamping cylinder is installed on the tooling plate, and the clamping mechanism is connected to the power output end of the clamping cylinder, and the clamping mechanism is connected to the power output end of the clamping cylinder. The clamping mechanism corresponds to the workpiece pressure plate; the clamping cylinder and the clamping mechanism are respectively provided with two, one of which is located on one end of the tooling plate, and the other is located on the other end of the tooling plate; the clamping cylinder has a first air inlet end and a second air inlet end, the first air inlet end is used to introduce compressed air so that the clamping cylinder drives the clamping mechanism to press against the workpiece pressure plate, and the second air inlet end is used to introduce compressed air so that the clamping cylinder drives the clamping mechanism to release from the workpiece pressure plate; the first air inlet pipe is connected to the first air inlet end of the clamping cylinder, a one-way valve is installed on the first air inlet pipe, and the one-way valve is provided with a pneumatic control end for releasing the check effect; the second air inlet pipe is respectively connected to the second air inlet end of the clamping cylinder and the pneumatic control end of the one-way valve.

[0009] Preferably, a quick connector is provided on the side of the tooling plate, a helium hole is provided on the upper side of the tooling plate, a first annular groove is provided on the outer periphery of the helium hole, a first sealing ring is installed in the first annular groove, one end of the helium channel is connected to the quick connector, and the other end of the helium channel is connected to the helium hole; a cavity is provided in the workpiece positioning seat, and the lower end of the workpiece can pass through the cavity to abut against the first sealing ring and be connected to the helium hole.

[0010] Preferably, the helium channel, the quick connector, the helium hole and the first sealing ring are respectively provided in two groups.

[0011] Preferably, the tooling plate is provided with a plurality of positioning pins and a plurality of positioning screw holes, the workpiece positioning seat is provided with a plurality of positioning holes corresponding to the positioning pins and a plurality of connecting holes corresponding to the positioning screw holes, the positioning pins are inserted upward into the corresponding positioning holes, and positioning screws are installed between the positioning screw holes and the connecting holes.

[0012] Preferably, the clamping mechanism includes a fixed block, a support rod and a pressure rod, the cylinder rod of the clamping cylinder is movably hinged to one end of the pressure rod, the other end of the pressure rod corresponds to the workpiece pressure plate, the fixed block is installed on the clamping cylinder, one end of the support rod is movably hinged to the fixed block, and the other end of the support rod is movably hinged to the middle part of the pressure rod.

[0013] Preferably, the first air intake pipe includes two first air intake branch pipes and a first air intake main pipe, the two first air intake branch pipes are respectively connected to the first air intake end of a compression cylinder, the two first air intake branch pipes are connected to the first air intake main pipe, and a first three-way joint is provided at the connection point; the number of the one-way valves is two, and the two one-way valves are respectively installed on the corresponding first air intake branch pipes.

[0014] Preferably, the second air intake pipe includes four second air intake branch pipes, two air intake branch pipes and a second air intake main pipe, wherein the two second air intake branch pipes are respectively connected to the second air intake end of a compression cylinder, the two second air intake branch pipes are connected to one of the air intake branch pipes, and a second three-way joint is provided at the connection; the other two second air intake branch pipes are respectively connected to the pneumatic control end of a one-way valve, the two second air intake branch pipes are connected to another air intake branch pipe, and a third three-way joint is provided at the connection; the two air intake branch pipes are connected to the second air intake main pipe, and a fourth three-way joint is provided at the connection.

[0015] The beneficial effects of the utility model are as follows: (1) Since a clamping cylinder is installed on the tooling plate, the clamping mechanism is connected to the power output end of the clamping cylinder, and the clamping mechanism corresponds to the workpiece clamping plate. Therefore, the utility model can use the driving clamping method of the clamping cylinder to clamp the workpiece clamping plate, so that the workpiece clamping plate and the workpiece positioning seat can lock and seal the workpiece together, with high speed, high efficiency, and convenient operation. The workpiece clamping plate has high stability in clamping the workpiece; (2) Since the clamping cylinder has a first air inlet end and a second air inlet end, the first air inlet end is used to The compressed air is introduced to make the clamping cylinder drive the clamping mechanism to press against the workpiece pressure plate. The second air inlet end is used to introduce compressed air to make the clamping cylinder drive the clamping mechanism to loosen from the workpiece pressure plate. The first air inlet pipe is connected to the first air inlet end of the clamping cylinder. A one-way valve is installed on the first air inlet pipe. The one-way valve is provided with a pneumatic control end for releasing the check function. The second air inlet pipe is respectively connected to the second air inlet end of the clamping cylinder and the pneumatic control end of the one-way valve. Therefore, when the external compressed air pipeline is connected to the first air inlet pipe, the compressed air can enter the first air inlet end of the clamping cylinder through the first air inlet pipe. The air end is connected to the clamping cylinder to drive the clamping mechanism to clamp the workpiece pressure plate. At this time, the external compressed air pipeline is unplugged. Under the non-return function of the one-way valve, the first air inlet pipe will not leak back. Therefore, the new helium air tightness detection tooling and the workpiece can flow to the air tightness detection station with the production line and be placed in the vacuum sealing box together. There is no need to connect the external compressed air intake pipe. The clamping cylinder can always maintain the clamping state and will not exhaust air into the vacuum sealing box, so the detection accuracy is high. After the detection is completed, the new helium air tightness detection tooling and the workpiece are taken out of the vacuum sealing box together. The compressed air is then taken out of the sealed box and flows along the production line to the compressed air operating station. The external compressed air pipeline is then connected to the second air inlet pipe, and the compressed air can enter the pneumatic control end of the one-way valve through the second air inlet pipe. The pneumatic control end pushes open the valve core of the one-way valve, releasing the non-return effect of the one-way valve, and the compressed air in the first air inlet end of the clamping cylinder will flow back out from the first air inlet pipe. At the same time, the compressed air can also enter the second air inlet end of the clamping cylinder through the second air inlet pipe, so that the clamping cylinder drives the clamping mechanism to release from the workpiece pressure plate to remove the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is one of the overall structural diagrams of the workpiece.

[0017] Figure 2 This is the second overall structural diagram of the workpiece.

[0018] Figure 3 This is one of the overall structural diagrams of the new helium air tightness detection tooling.

[0019] Figure 4 This is the second overall structural diagram of the new helium air tightness testing tooling.

[0020] Figure 5 This is one of the scattered structure diagrams of the new helium air tightness detection tooling.

[0021] Figure 6 This is the second diagram of the dispersed structure of the new helium air tightness testing tooling.

[0022] Figure 7 This is a structural diagram of the compression cylinder.

[0023] Figure 8 This is a cross-sectional structural diagram of the tooling plate. DETAILED DESCRIPTION

[0024] The structural principle and working principle of the utility model are further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, the workpiece 100 that needs to be tested for helium air tightness of the utility model is a car charging pile liquid cooling control box assembly composed of more than two structural components. The workpiece 100 includes an inner cavity, and the upper end of the workpiece 100 has three cavity openings 101, and the middle part of the lower end of the workpiece 100 has two protrusions 102 extending downward, and the lower ends of the two protrusions 102 have flow channel openings 103 respectively. When testing the air tightness of the workpiece, the three cavity openings 101 need to be sealed, and then helium is introduced from the flow channel openings 103 at the lower ends of the two protrusions 102, so that the helium enters the inner cavity of the workpiece 100, and then the inner cavity of the workpiece 100 is tested for air leakage. It should be noted that the utility model is not limited to the detection of the car charging pile liquid cooling control box assembly, but is also suitable for detecting other workpieces.

[0026] like Figure 3-Figure 8As shown, the utility model is a novel helium air tightness detection tool, comprising a tooling plate 1, a workpiece positioning seat 2, a workpiece pressing plate 3, a clamping cylinder 4, a clamping mechanism 5, a first air inlet pipe 6 and a second air inlet pipe 7; the workpiece positioning seat 2 is installed on the tooling plate 1, and the workpiece positioning seat 2 is used to support and position the lower end of the workpiece 100; the tooling plate 1 is provided with a helium channel 11, and helium can enter the workpiece 100 through the helium channel 11. After the workpiece positioning seat 2 supports and positions the workpiece 100, the flow channel opening 103 of the protrusion 102 at the lower end of the workpiece 100 abuts against the outlet of the helium channel 11; the workpiece pressing plate 3 is arranged above the workpiece positioning seat 2, and is used to press the workpiece 100 downward and seal the upper end of the workpiece 100; the clamping cylinder 5 4 is installed on the tooling plate 1, the clamping mechanism 5 is connected to the power output end of the clamping cylinder 4, and the clamping mechanism 5 corresponds to the workpiece pressing plate 3; the clamping cylinder 4 has a first air inlet end 41 and a second air inlet end 42, the first air inlet end 41 is used to pass compressed air so that the clamping cylinder 4 drives the clamping mechanism 5 to press against the workpiece pressing plate 3, and the second air inlet end 42 is used to pass compressed air so that the clamping cylinder 4 drives the clamping mechanism 5 to release from the workpiece pressing plate 3; the first air inlet pipe 6 is connected to the first air inlet end 41 of the clamping cylinder 4, and a one-way valve 8 is installed on the first air inlet pipe 6, and the one-way valve 8 is provided with a pneumatic control end 81 for releasing the check function; the second air inlet pipe 7 is respectively connected to the second air inlet end 42 of the clamping cylinder 4 and the pneumatic control end 81 of the one-way valve 8.The utility model can use the driving and clamping method of the clamping cylinder 4 to clamp the workpiece clamping plate 3, so that the workpiece clamping plate 3 and the workpiece positioning seat 2 can lock and seal the workpiece 100 together, with fast speed, high efficiency, and convenient operation. The workpiece clamping plate 3 has high clamping stability on the workpiece 100; when the external compressed air pipeline (not shown) is connected to the first air inlet pipe 6, the compressed air can enter the first air inlet end 41 of the clamping cylinder 4 through the first air inlet pipe 6, so that the clamping cylinder 4 drives the clamping mechanism 5 to clamp the workpiece clamping plate 3. At this time, the external compressed air pipeline is unplugged, and under the non-return effect of the one-way valve 8, the first air inlet pipe 6 will not leak back; therefore, the new helium air tightness detection tooling and the workpiece 100 can flow to the air tightness detection station along the production flow line, and be placed in the vacuum sealing box together, without the need to connect the external compressed air inlet pipe, and the compression The tightening cylinder 4 can always maintain a tightened state and will not exhaust air into the vacuum sealing box, so the detection accuracy is high. After the detection is completed, the new helium air tightness detection tooling and the workpiece 100 are taken out of the vacuum sealing box together, flow along the production flow line to the compressed air operation station, and then the external compressed air pipeline is connected to the second air inlet pipe 7, and the compressed air can enter the pneumatic control end 81 of the one-way valve 8 through the second air inlet pipe 7. The pneumatic control end 81 pushes open the valve core of the one-way valve 8, and the non-return effect of the one-way valve 8 is released. The compressed air in the first air inlet end 41 of the tightening cylinder 4 will flow back from the first air inlet pipe 6; at the same time, the compressed air can also enter the second air inlet end 42 of the tightening cylinder 4 through the second air inlet pipe 7, so that the tightening cylinder 4 drives the tightening mechanism 5 to loosen from the workpiece pressing plate 3, so as to remove the workpiece 100.

[0027] like Figure 3-Figure 6 , Figure 8 As shown, a quick connector 12 is provided on the side of the tooling plate 1, and the quick connector 12 is used to quickly connect the helium input pipeline of the helium air tightness detection instrument; a helium hole 13 is provided on the upper side of the tooling plate 1, and a circle of first annular groove 14 is provided on the outer periphery of the helium hole 13, and a first sealing ring 15 is installed in the first annular groove 14, one end of the helium channel 11 is connected with the quick connector 12, and the other end of the helium channel 11 is connected with the helium hole 13; a cavity 21 is provided in the workpiece positioning seat 2, and the lower end of the workpiece 100 can pass through the cavity 21 to abut on the first sealing ring 15 and be connected with the helium hole 13, specifically, the flow channel opening 103 of the protrusion 102 at the lower end of the workpiece 100 abuts against the outside of the helium hole 13 and contacts with the first sealing ring 15 to form a sealing effect.

[0028] like Figure 3-Figure 6As shown, the helium channel 11, the quick connector 12, the helium hole 13 and the first sealing ring 15 are respectively provided with two groups, so that the air tightness test can be performed on the two inner cavities of the workpiece 100 at one time. Of course, if the workpiece 100 has multiple inner cavities, then helium channels, quick connectors, helium holes and first sealing rings matching the number of inner cavities of the workpiece 100 can also be provided.

[0029] like Figure 3-Figure 6 As shown, the tooling plate 1 is provided with a plurality of positioning pins 16 and a plurality of positioning screw holes 17, and the workpiece positioning seat 2 is provided with a plurality of positioning holes 22 corresponding to the positioning pins and a plurality of connecting holes 23 corresponding to the positioning screw holes. The positioning pins 16 are inserted upward into the corresponding positioning holes 22, and positioning screws (not shown) are installed between the positioning screw holes 17 and the connecting holes 23. In this way, the workpiece positioning seat 2 can be stably installed on the tooling plate 1.

[0030] like Figure 5 and Figure 6 As shown, the lower end of the workpiece pressing plate 3 is provided with a plurality of second sealing rings 31, and the upper end of the workpiece 100 can abut against the lower side of the second sealing ring 31. The number of the second sealing rings 31 of the utility model is three. The upper end of the workpiece 100 has three cavity openings 101, and the three cavity openings 101 need to be sealed during the air tightness test. The three second sealing rings 31 can abut against the edges of the three cavity openings 101 to seal the cavity openings 101.

[0031] like Figure 3-Figure 6 As shown, the clamping cylinder 4 and the clamping mechanism 5 are respectively provided with two, one of which is located on one end of the tooling plate 1, and the other is located on the other end of the tooling plate 1. In this way, the workpiece pressing plate 3 can be clamped from both sides, and the stability is high. The clamping mechanism 5 includes a fixed block 51, a support rod 52 and a pressing rod 53, the cylinder rod of the clamping cylinder 4 is movably hinged to one end of the pressing rod 53, and the other end of the pressing rod 53 is correspondingly matched with the workpiece pressing plate 3, the fixed block 51 is installed on the clamping cylinder 4, one end of the support rod 52 is movably hinged to the fixed block 51, and the other end of the support rod 52 is movably hinged to the middle part of the pressing rod 53.

[0032] like Figure 3-Figure 6As shown, the first air intake pipe 6 includes two first air intake branch pipes 61 and a first air intake main pipe 62. The two first air intake branch pipes 61 are respectively connected to the first air intake end 41 of the compression cylinder 4. The two first air intake branch pipes 61 are connected to the first air intake main pipe 62, and a first three-way joint 63 is provided at the connection point. There are two one-way valves 8, and the two one-way valves 8 are respectively installed on the corresponding first air intake branch pipes 61. In this way, when the first air intake main pipe 62 is connected to the compressed air pipeline, compressed air can be input to the first air intake ends 41 of the two compression cylinders 4 at the same time, and the synchronization of the two compression cylinders 4 is high. The second air intake pipe 7 includes four second air intake branch pipes 71, two air intake branch pipes 72 and a second air intake main pipe 73, wherein the two second air intake branch pipes 71 are respectively connected to the second air intake end 42 of a compression cylinder 4, the two second air intake branch pipes 71 are connected to one of the air intake branch pipes 72, and a second three-way joint 74 is provided at the connection; the other two second air intake branch pipes 71 are respectively connected to the pneumatic control end 81 of a one-way valve 8, the two second air intake branch pipes 71 are connected to another air intake branch pipe 72, and a third three-way joint 75 is provided at the connection; the two air intake branch pipes 72 are connected to the second air intake main pipe 73, and a fourth three-way joint 76 is provided at the connection. In this way, when the second air intake main pipe 73 is connected to the compressed air pipeline, compressed air can be simultaneously input to the pneumatic control ends 81 of the two one-way valves 8 and the second air intake ends 42 of the two compression cylinders 4, and the synchronization of the two compression cylinders 4 is high.

[0033] The detection method of the novel helium air tightness detection tool of the utility model comprises the following detection steps:

[0034] S1. Place the workpiece 100 on the workpiece positioning seat 2 of the new helium air tightness detection tooling, and connect the lower end of the workpiece 100 to the helium channel 11 of the tooling plate 1, and then cover the workpiece pressing plate 3;

[0035] S2. Connect the compressed air pipeline (not shown) to the first air inlet pipe 6. After passing through the first air inlet pipe 6 and the one-way valve 8, the compressed air enters the first air inlet end 41 of the pressing cylinder 4. The pressing cylinder 4 drives the pressing mechanism 5 to press the workpiece pressing plate 3. The workpiece pressing plate 3 presses the workpiece 100 downward and seals the upper end of the workpiece 100. The workpiece pressing plate 3 and the workpiece positioning seat 2 together lock the workpiece 100.

[0036] S3. Unplug the compressed air pipeline. Under the non-return function of the one-way valve 8, the first air inlet pipe 6 will not leak back, and the clamping cylinder 4 maintains the clamping state of the workpiece clamp 3;

[0037] S4. The new helium air tightness detection tool and the workpiece 100 flow along the production line to the helium air tightness detection station, and are placed together in a vacuum sealing box (not shown). The clamping cylinder 4 continues to maintain the clamping state of the workpiece clamping plate 3, and no exhaust is discharged into the vacuum sealing box; during the transfer process of the new helium air tightness detection tool of the utility model,

[0038] S5. Connect the helium channel 11 of the tooling plate 1 to the helium input pipe of the helium air tightness detection instrument (not shown);

[0039] S6. The vacuum sealing box is evacuated with a vacuum pump (not shown), the helium input pipe is connected to the quick connector 12, and the helium is injected into the workpiece 100 through the helium input pipe and the helium channel 11 of the tooling plate 1;

[0040] S7. The helium detection instrument detects whether there is helium in the vacuum sealing box; if helium can be detected, it means that the workpiece 100 has helium leakage, the helium airtightness test fails, and the workpiece 100 is defective; if helium cannot be detected, it means that the workpiece 100 has no helium leakage, the helium airtightness test passes, and the workpiece 100 passes the airtightness test;

[0041] S8. After the helium air tightness test is completed, the new helium air tightness test tool and the workpiece 100 are taken out from the vacuum sealing box and flow along the production line to the compressed air operation station;

[0042] S9. Connect the compressed air pipeline to the second air inlet pipe 7, and the compressed air enters the pneumatic control end 81 of the one-way valve 8 through the second air inlet pipe 7. The pneumatic control end 81 pushes open the valve core of the one-way valve 8, releasing the check function of the one-way valve 8, and the compressed air in the first air inlet end 41 of the clamping cylinder 4 will flow back out from the first air inlet pipe 6; at the same time, the compressed air enters the second air inlet end 42 of the clamping cylinder 4 through the second air inlet pipe 7, so that the clamping cylinder 4 drives the clamping mechanism 5 to release from the workpiece pressing plate 3;

[0043] S10. Remove the workpiece pressing plate 3, take out the workpiece 100, and complete the helium air tightness test of the workpiece 100.

[0044] The above is only a preferred embodiment of the present invention. Any slight modification, equivalent changes and modifications made to the above embodiments according to the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A new type of helium air tightness detection tool, characterized by: It includes a tooling plate, a workpiece positioning seat, a workpiece pressing plate, a clamping cylinder, a clamping mechanism, a first air inlet pipe and a second air inlet pipe; the workpiece positioning seat is installed on the tooling plate, and the workpiece positioning seat is used to support and position the lower end of the workpiece; the tooling plate is provided with a helium channel, and helium can enter the workpiece through the helium channel; the workpiece pressing plate is arranged above the workpiece positioning seat, and is used to press the workpiece downward and seal the upper end of the workpiece, and the lower end of the workpiece pressing plate is provided with a plurality of second sealing rings, and the upper end of the workpiece can abut against the lower side of the second sealing ring; the clamping cylinder is installed on the tooling plate, and the clamping mechanism is connected to the power output end of the clamping cylinder, and the clamping mechanism corresponds to the workpiece pressing plate; the clamping Two cylinders and two clamping mechanisms are provided respectively, one of which is located on one end of the tooling plate, and the other is located on the other end of the tooling plate; the clamping cylinder has a first air inlet end and a second air inlet end, the first air inlet end is used to introduce compressed air so that the clamping cylinder drives the clamping mechanism to press against the workpiece pressure plate, and the second air inlet end is used to introduce compressed air so that the clamping cylinder drives the clamping mechanism to release from the workpiece pressure plate; the first air inlet pipe is connected to the first air inlet end of the clamping cylinder, a one-way valve is installed on the first air inlet pipe, and the one-way valve is provided with a pneumatic control end for releasing the check function; the second air inlet pipe is respectively connected to the second air inlet end of the clamping cylinder and the pneumatic control end of the one-way valve.

2. The novel helium air tightness detection tool according to claim 1 is characterized in that: A quick connector is provided on the side of the tooling plate, a helium hole is provided on the upper side of the tooling plate, a first annular groove is provided on the outer periphery of the helium hole, a first sealing ring is installed in the first annular groove, one end of the helium channel is connected to the quick connector, and the other end of the helium channel is connected to the helium hole; a cavity is provided in the workpiece positioning seat, and the lower end of the workpiece can pass through the cavity to abut against the first sealing ring and be connected to the helium hole.

3. The novel helium air tightness detection tool according to claim 2 is characterized in that: The helium channel, the quick connector, the helium hole and the first sealing ring are respectively provided in two groups.

4. The novel helium air tightness detection tool according to claim 1 is characterized in that: The tooling plate is provided with a plurality of positioning pins and a plurality of positioning screw holes, the workpiece positioning seat is provided with a plurality of positioning holes corresponding to the positioning pins and a plurality of connecting holes corresponding to the positioning screw holes, the positioning pins are inserted upward into the corresponding positioning holes, and positioning screws are installed between the positioning screw holes and the connecting holes.

5. The novel helium air tightness detection tool according to claim 1 is characterized in that: The clamping mechanism includes a fixed block, a support rod and a pressure rod. The cylinder rod of the clamping cylinder is movably hinged to one end of the pressure rod, and the other end of the pressure rod corresponds to the workpiece pressure plate. The fixed block is installed on the clamping cylinder, one end of the support rod is movably hinged to the fixed block, and the other end of the support rod is movably hinged to the middle part of the pressure rod.

6. The novel helium air tightness detection tool according to claim 1 is characterized in that: The first air intake pipe includes two first air intake branch pipes and a first air intake main pipe. The two first air intake branch pipes are respectively connected to the first air intake end of a compression cylinder. The two first air intake branch pipes are connected to the first air intake main pipe, and a first three-way joint is provided at the connection point. The number of the one-way valves is two, and the two one-way valves are respectively installed on the corresponding first air intake branch pipes.

7. The novel helium air tightness detection tool according to claim 6 is characterized in that: The second air intake pipe includes four second air intake branch pipes, two air intake branch pipes and a second air intake main pipe, wherein the two second air intake branch pipes are respectively connected to the second air intake end of a compression cylinder, the two second air intake branch pipes are connected to one of the air intake branch pipes, and a second three-way joint is provided at the connection; the other two second air intake branch pipes are respectively connected to the pneumatic control end of a one-way valve, the two second air intake branch pipes are connected to another air intake branch pipe, and a third three-way joint is provided at the connection; the two air intake branch pipes are connected to the second air intake main pipe, and a fourth three-way joint is provided at the connection.

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