CN218916720U - Airtight testing arrangement and production line - Google Patents

Abstract

The utility model discloses an airtight testing device and a production line, and belongs to the technical field of airtight testing. The airtight testing device is used for performing airtight testing on a product to be tested, the product to be tested comprises a product gas circuit, a product water circuit and a product oil circuit, the airtight testing device comprises a bottom plate, a positioning carrier, a water circuit testing unit, a gas circuit testing unit and an oil circuit testing unit are arranged on the bottom plate, the positioning carrier comprises a positioning component and a clamping component, the positioning component is used for positioning the product to be tested, and the clamping component is used for clamping the product to be tested which is positioned on the positioning component; the waterway test unit is used for inflating and plugging a waterway of the product; the gas circuit test unit is used for inflating and plugging a product gas circuit; the oil circuit test unit is used for inflating and plugging the oil circuit of the product. According to the airtight testing device and the production line, during testing, products can be prevented from being damaged, and testing efficiency is improved.

Description

Airtight testing arrangement and production line

Technical Field

The utility model relates to the technical field of airtight testing, in particular to an airtight testing device and a production line.

Background

When products such as automobiles and the like are subjected to airtight tests, one hole is usually selected for inflation on the products, and the rest holes are all plugged so as to test the overall airtight performance of the products. However, the pressure conditions of the different cavities within the product vary considerably, and there is a risk of damaging the product by the overall inflation through only one hole. And if there is a place of leakage in the testing process, need to test repeatedly and seek the product leakage position, efficiency is lower.

Disclosure of Invention

The utility model aims to provide an airtight testing device and a production line, which can avoid damaging products and improve testing efficiency.

To achieve the purpose, the utility model adopts the following technical scheme:

in one aspect, an airtight testing device is provided for airtight test is carried out to the product that awaits measuring, the product that awaits measuring includes product gas circuit, product water route and product oil circuit, airtight testing device includes the bottom plate, be equipped with on the bottom plate:

the positioning carrier comprises a positioning assembly and a clamping assembly, wherein the positioning assembly is used for positioning the product to be tested, and the clamping assembly is used for clamping the product to be tested positioned on the positioning assembly;

the waterway test unit is used for inflating and plugging the waterway of the product;

the gas circuit testing unit is used for inflating and plugging the gas circuit of the product;

and the oil circuit testing unit is used for inflating and plugging the oil circuit of the product.

In some possible embodiments, the waterway test unit includes:

the supporting plate is arranged on the bottom plate;

the waterway driving piece is arranged on the supporting plate;

the waterway connector assembly is connected to the output end of the waterway driving piece and comprises a waterway air inlet plug, a waterway air inlet connector and a waterway blocking plug, wherein the waterway air inlet plug and the waterway blocking plug are respectively used for blocking the waterway of the product, and the waterway air inlet connector is communicated with the waterway air inlet plug to inflate the waterway of the product.

In some possible embodiments, the waterway test unit further includes:

the water joint assembly is connected to the connecting plate and can move along the first guide assembly;

the sliding chute with the bottom plate is arranged on the inclined wedge, the cam roller is in rolling connection with the sliding chute, the waterway driving part can drive the inclined wedge to move along the second guide assembly, the connecting plate is connected with the cam roller, and the guide direction of the first guide assembly and the guide direction of the second guide assembly are arranged at an included angle.

In some possible embodiments, the gas circuit test unit includes a base plate fixed to the base plate:

the device comprises a first air passage driving piece, an air passage blocking head connected to the output end of the first air passage driving piece and a floating joint connected between the first air passage driving piece and the air passage blocking head, wherein the air passage blocking head is used for blocking an air passage of a product;

the device comprises a second gas path driving piece, a gas path air inlet plug connected to the output end of the second gas path driving piece, a gas path air inlet connector connected to the gas path air inlet plug, and a floating connector connected between the output end of the second gas path driving piece and the gas path air inlet plug, wherein the gas path air inlet plug is used for blocking a product gas path and is communicated with the gas path air inlet plug through the gas path air inlet connector so as to charge the product gas path.

In some possible embodiments, the oil path test unit includes a base plate fixed to the base plate:

the oil circuit blocking head is used for blocking the oil circuit of the product;

the oil way air inlet plug is used for plugging the product oil way, and is communicated with the oil way air inlet plug through the oil way air inlet connector so as to charge air to the product oil way.

In some possible embodiments, the positioning assembly includes a positioning carrier and two positioning pins disposed on the positioning carrier, two positioning holes are formed in the product to be tested, and the two positioning pins are correspondingly inserted into the two positioning holes.

In some possible embodiments, the positioning carrier further includes a sealing ring disposed on the positioning carrier, the product to be tested is connected to the positioning carrier by the sealing ring in a sealing manner, and the sealing ring is adapted to the shape of the opening on the product to be tested.

In some possible embodiments, the clamping assembly comprises a clamping driving member and a connecting rod assembly, wherein the connecting rod assembly is connected to the output end and the fixed end of the clamping driving member, and a pressure head is arranged on the connecting rod assembly and is used for pressing and connecting the product to be tested.

In some possible embodiments, the device further comprises a frame body and a connecting assembly, wherein a handle and a roller are arranged on the bottom plate, the bottom plate is detachably connected to the frame body through the connecting assembly, the roller is arranged on one side of the bottom plate facing the frame body, and the handle is arranged on one side of the bottom plate facing away from the frame body.

On the other hand, a production line is provided, which comprises the airtight testing device.

The utility model has the beneficial effects that:

according to the airtight testing device and the production line, the cavity loop is divided into the product gas path, the product water path and the product oil path according to different cavity loops in the product to be tested. During testing, the positioning assembly is used for positioning the product to be tested, and the clamping assembly is used for clamping the product to be tested, so that the product to be tested is ensured to be fixed. The waterway test unit, the gas circuit test unit and the oil circuit test unit respectively plug the product waterway, the product gas circuit and the product oil circuit, and then the waterway test unit, the gas circuit test unit and the oil circuit test unit simultaneously inflate the product waterway, the product gas circuit and the product oil circuit to perform leakage test. The three branches are divided into three branches, and the cavity loop is inflated at the same time, so that the risk of damaging products is reduced; and after the three branches are respectively inflated, the sealing performance of the three branches is respectively detected, the unqualified parts of the product to be tested do not need to be repeatedly tested, and the testing efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of an airtight testing apparatus at a viewing angle according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a product provided in an airtight testing apparatus according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of an airtight testing apparatus at another view angle according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a positioning carrier according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a clamping assembly provided in accordance with an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a waterway testing unit according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of a portion of a gas circuit test unit provided in accordance with an embodiment of the present utility model;

FIG. 8 is another schematic view of a portion of a gas circuit test unit provided in accordance with an embodiment of the present utility model;

FIG. 9 is a schematic diagram of a portion of an oil circuit test unit provided in an embodiment of the present utility model;

fig. 10 is another schematic diagram of a portion of an oil path test unit according to an embodiment of the present utility model.

In the figure:

100. a product to be tested;

1. positioning a carrier; 11. a positioning assembly; 111. positioning the carrier; 112. a positioning pin; 113. a seal ring; 12. a clamping assembly; 121. clamping the driving member; 122. a connecting rod assembly; 1221. a pressure head;

2. a waterway test unit; 21. a support plate; 22. a waterway driving member; 23. a waterway air inlet plug; 24. a waterway air inlet joint; 25. a waterway plug; 26. a connecting plate; 27. a first guide assembly; 28. wedge block; 29. a cam roller; 210. a second guide assembly;

3. the gas circuit test unit; 31. a first air path driving member; 32. the gas circuit plugs; 33. a floating joint; 34. a second air path driving member; 35. an air inlet plug of the air channel; 36. the air inlet connector of the air path;

4. an oil path test unit; 41. a first oil path driving member; 42. an oil way blocking head; 43. a second oil path driving member; 44. an oil way air inlet plug; 45. an oil way air inlet joint;

5. a bottom plate; 51. a handle; 52. a roller; 53. a handle;

6. a quick-change pin; 7. a gas-electricity quick-change connector.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The embodiment provides a production line, which comprises an airtight testing device for performing airtight testing on a product 100 to be tested. The embodiment also provides an airtight testing device, as shown in fig. 1 and 2, the product 100 to be tested comprises a product gas circuit, a product water circuit and a product oil circuit, the airtight testing device comprises a bottom plate 5, a positioning carrier 1, a water circuit testing unit 2, a gas circuit testing unit 3 and an oil circuit testing unit 4 are arranged on the bottom plate 5, the positioning carrier 1 comprises a positioning component 11 and a clamping component 12, the positioning component 11 is used for positioning the product 100 to be tested, and the clamping component 12 is used for clamping the product 100 to be tested positioned on the positioning component 11; the waterway test unit 2 is used for inflating and plugging a waterway of a product; the gas circuit test unit 3 is used for inflating and plugging a product gas circuit; the oil circuit test unit 4 is used for inflating and plugging a product oil circuit.

According to different cavity loops in the product 100 to be tested, the cavity loops are divided into a product air path, a product water path and a product oil path. During testing, the positioning assembly 11 positions the product 100 to be tested, and the clamping assembly 12 clamps the product 100 to be tested, so that the product 100 to be tested is ensured to be fixed. The waterway test unit 2, the air circuit test unit 3 and the oil circuit test unit 4 respectively plug a product waterway, a product air circuit and a product oil circuit, and then the waterway test unit 2, the air circuit test unit 3 and the oil circuit test unit 4 simultaneously inflate the product waterway, the product air circuit and the product oil circuit to perform leakage test. The three branches are divided into three branches, and the cavity loop is inflated at the same time, so that the risk of damaging products is reduced; and after the three branches are respectively inflated, the sealing performance of the three branches is respectively detected, the unqualified parts of the product 100 to be tested do not need to be repeatedly tested, and the testing efficiency is improved. The waterway test unit 2, the air circuit test unit 3 and the oil circuit test unit 4 are adaptively arranged according to three branches to respectively block and inflate, so that automatic test can be realized, the efficiency is improved, and the labor cost is reduced.

Different products, the structure of its cavity return circuit is different, therefore, in an embodiment, as shown in fig. 1-3, airtight testing device still includes support body and coupling assembling, be equipped with handle 51 and gyro wheel 52 on the bottom plate 5, bottom plate 5 passes through coupling assembling and can dismantle and connect in the support body, gyro wheel 52 locates the side of bottom plate 5 towards the support body, handle 51 locates the side that bottom plate 5 deviates from the support body, grip handle 51, with bottom plate 5 and support body dismouting, afterwards through pulling handle 53, gyro wheel 52 roll, conveniently take off or put bottom plate 5 on the support body, when testing on same airtight testing device to the product of different shapes, set up corresponding location carrier 1 on different bottom plates 5 according to different products, waterway testing unit 2, air circuit testing unit 3 and oil circuit testing unit 4, in order to improve airtight testing device's compatibility to different products, reduce cost. Specifically, the connecting assembly comprises a quick-change pin 6 and an air-electricity quick-change connector 7, quick disassembly and connection of an air circuit and a circuit are realized, and the quick-change pin 6 and the air-electricity quick-change connector 7 are outsourcing parts and are not described in detail.

In one embodiment, as shown in fig. 2 and fig. 4, two positioning holes are formed in the product 100 to be tested, the positioning assembly 11 includes a positioning carrier 111 and two positioning pins 112 disposed on the positioning carrier 111, and specifically, the positions and sizes of the two positioning pins 112 are set according to the positions and sizes of the two positioning holes on the product 100 to be tested, and the two positioning pins 112 are correspondingly inserted into the two positioning holes, so that the product 100 to be tested is positioned on the positioning carrier 111. In one embodiment, an opening is formed in the bottom of the product to be tested 100, the positioning carrier 1 further includes a sealing ring 113 disposed on the positioning carrier 111, the product to be tested 100 is connected to the positioning carrier 111 through the sealing ring 113 in a sealing manner, and the sealing ring 113 is adapted to the shape of the opening on the product to be tested 100, so that the opening is plugged, and the influence on the testing effect is avoided. Specifically, a groove corresponding to the shape of the opening is formed in the positioning carrier 111, and the sealing ring 113 is installed in the groove, so that the shape of the sealing ring 113 is matched with the shape of the opening, and the sealing performance is good.

In one embodiment, as shown in fig. 5, the clamping assembly 12 includes a clamping driving member 121 and a connecting rod assembly 122, the connecting rod assembly 122 is connected to an output end and a fixed end of the clamping driving member 121, a pressing head 1221 is arranged on the connecting rod assembly 122, the pressing head 1221 is used for pressing a product 100 to be tested, the clamping driving member 121 stretches out and retracts to drive the pressing head 1221 to clamp and release the product 100 to be tested, and by arranging the connecting rod assembly 122, the clamping force is increased by utilizing the lever principle, and the reliability of clamping the product is improved. In one embodiment, the clamping assembly 12 includes a clamping driving member 121, a first connecting rod connected to an output end of the clamping driving member 121, a second connecting rod connected to a fixed end of the clamping driving member 121, and a third connecting rod hinged to the first connecting rod and the second connecting rod, wherein a pressing head 1221 is disposed on the third connecting rod, and the pressing head 1221 is used for pressing the product 100 to be tested. Through lever principle, realized doubly the power and pressed from both sides tightly, specific first connecting rod, second connecting rod and third connecting rod's length relation reference prior art or through experimental confirm can, and it is unnecessary to describe again. Specifically, the clamping driver 121 is an air cylinder.

In one embodiment, as shown in fig. 6, the waterway testing unit 2 includes a support plate 21, a waterway driving member 22, and a waterway connector assembly, the support plate 21 is disposed on the bottom plate 5, the waterway driving member 22 is disposed on the support plate 21, the waterway connector assembly is connected to an output end of the waterway driving member 22, the waterway connector assembly includes a waterway air inlet plug 23, a waterway air inlet connector 24, and a waterway plug 25, the waterway air inlet plug 23 and the waterway plug 25 are respectively used for plugging a waterway of a product, and are communicated by the waterway air inlet connector 24 and the waterway air inlet plug 23 to inflate the waterway of the product. The product waterway is plugged through the waterway plug 25, so that the product waterway is prevented from leaking, the waterway air inlet is plugged on the product waterway, and the air leakage in the inflation process is avoided, so that the inflation and test reliability is improved.

In one embodiment, waterway test unit 2 further includes a web 26, a wedge 28, and a cam roller 29, waterway connector assembly is coupled to web 26, and web 26 is movable along a first guide assembly 27; the chute that is the contained angle with bottom plate 5 has been seted up to the wedge 28, and cam roller 29 roll connection is in the chute, and waterway driver 22 can drive wedge 28 and remove along second direction subassembly 210, and connecting plate 26 is connected in cam roller 29, and the direction of first direction subassembly 27 and the direction of second direction subassembly 210 are the contained angle setting, through above-mentioned structure, has realized converting the direction of motion with the waterway connector subassembly, and the structure is simplified, makes compact structure, saves space. In this embodiment, the first guide assembly 27 and the second guide assembly 210 are both guide rail slider mechanisms, the cam roller 29 is disposed on the first guide assembly 27 to realize movement along a vertical direction, and the wedge 28 is disposed on the second guide assembly 210 to realize movement along a horizontal direction, so that horizontal movement of the waterway driving piece 22 is converted into vertical movement, and the device is particularly suitable for a structure with a narrow space. Specifically, the waterway driving member 22 is an air cylinder, and in other embodiments, a combination structure of a motor and a transmission mechanism may be used, which is not limited. After the product 100 to be tested is arranged on the positioning carrier 1, the waterway driving piece 22 drives the waterway connector assembly to plug, and then the waterway air inlet connector 24 is used for inflating.

In this embodiment, the through hole of the product waterway is downward, the waterway inlet plug 23 and the waterway blocking plug 25 are upward, and the waterway inlet connector 24 is disposed on one side of the waterway inlet plug 23, so as to be connected with an air pipe.

Specifically, the waterway air inlet connector 24 may adopt an outsourced pneumatic quick connector, and the waterway air inlet plug 23 and the waterway plug 25 are both plug structures with O-rings at the tops, so as to realize plugging. The waterway air inlet plug 23 is provided with a passage, one end of the passage passes through the O-shaped ring to be communicated with a waterway of the product, and the other end of the passage is connected with the waterway air inlet connector 24.

In one embodiment, as shown in fig. 7, the air path testing unit 3 includes a first air path driving member 31 fixed on the base plate 5, an air path blocking head 32 connected to an output end of the first air path driving member 31, and a floating joint 33 connected between the first air path driving member 31 and the air path blocking head 32, where the air path blocking head 32 is used for blocking an air path of a product; in one embodiment, as shown in fig. 8, the air channel testing unit 3 includes a second air channel driving member 34 fixed on the bottom plate 5, an air channel air inlet plug 35 connected to an output end of the second air channel driving member 34, an air channel air inlet connector 36 connected to the air channel air inlet plug 35, and a floating connector 33 connected between the output end of the second air channel driving member 34 and the air channel air inlet plug 35, where the air channel air inlet plug 35 is used for blocking the air channel of the product, and is communicated with the air channel air inlet plug 35 through the air channel air inlet connector 36 to inflate the air channel of the product. The gas path blocking head 32 is used for blocking a gas path of a product, so that gas leakage is avoided, and the gas path inlet plug 35 is used for blocking the gas path of the product, so that gas leakage in the inflation process is avoided. After the product 100 to be tested is arranged on the positioning carrier 1, the first air passage driving piece 31 and the second air passage driving piece 34 are respectively driven, so that the air passage blocking head 32 and the air passage air inlet blocking head 35 are respectively blocked on the product air passage, and then the product air passage is inflated through the air passage air inlet connector 36 and the air passage air inlet blocking head 35. Specifically, the first air path driving member 31 and the second air path driving member 34 are both cylinders. By arranging the floating joint 33, the impact force of the product 100 to be tested when the product gas path is blocked is reduced, and the reliability is improved.

Specifically, the air inlet connector 36 of the air channel can adopt an outsourced pneumatic quick connector, and the air inlet plug 35 and the air channel plug 32 are both plug structures with O-shaped rings at the tops so as to realize the plugging. The air inlet plug 35 is provided with a passage, one end of the passage penetrates through the O-shaped ring to be communicated with the product air passage, and the other end of the passage is connected with the air inlet connector 36 of the air passage.

In one embodiment, as shown in fig. 9, the oil path testing unit 4 includes a first oil path driving part 41 fixed on the base plate 5 and an oil path blocking head 42 connected to an output end of the first oil path driving part 41, the oil path blocking head 42 being used for blocking a product oil path; in one embodiment, as shown in fig. 10, the oil path testing unit 4 includes a second oil path driving part 43 fixed on the base plate 5, an oil path air inlet plug 44 connected to an output end of the second oil path driving part 43, and an oil path air inlet connector 45, wherein the oil path air inlet plug 44 is used for blocking a product oil path, and is communicated with the oil path air inlet plug 44 through the oil path air inlet connector 45 to charge air to the product oil path. The oil way blocking plug 42 is used for blocking the oil way of the product, so that air leakage is avoided, and the oil way air inlet plug 44 is used for blocking the oil way of the product, so that air leakage in the inflation process is avoided. After the product 100 to be measured is arranged on the positioning carrier 1, the first oil way driving piece 41 and the second oil way driving piece 43 are respectively driven, when the oil way blocking head 42 and the oil way air inlet blocking head 44 are respectively blocked on the oil way of the product, and then the product oil way is inflated through the oil way air inlet joint 45 and the oil way air inlet blocking head 44. The first oil path driving member 41 and the second oil path driving member 43 are cylinders, and further, the first oil path driving member 41 is provided with two cylinders, and the oil path blocking head 42 is driven in two directions, and is specifically set according to an actual structure, without limitation.

Specifically, the oil inlet connector 45 may be an outsourced pneumatic quick connector, and the oil inlet plug 44 and the oil blocking plug 42 are both plug structures with O-rings on the tops, so as to realize blocking. The oil path air inlet plug 44 is provided with a path, one end of the path passes through the O-ring to be communicated with the oil path of the product, and the other end of the path is connected with the oil path air inlet connector 45.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides an airtight testing arrangement, its characterized in that is used for carrying out airtight test to product (100) to be tested, product (100) to be tested include product gas circuit, product water route and product oil circuit, airtight testing arrangement includes bottom plate (5), be equipped with on bottom plate (5):

the positioning carrier (1) comprises a positioning assembly (11) and a clamping assembly (12), wherein the positioning assembly (11) is used for positioning the product (100) to be tested, and the clamping assembly (12) is used for clamping the product (100) to be tested which is positioned on the positioning assembly (11);

the waterway test unit (2) is used for inflating and plugging the waterway of the product;

the gas circuit testing unit (3) is used for inflating and plugging the gas circuit of the product;

and the oil circuit testing unit (4) is used for inflating and plugging the oil circuit of the product.

2. The air tightness testing device according to claim 1, wherein said waterway testing unit (2) comprises:

a support plate (21), wherein the support plate (21) is arranged on the bottom plate (5);

a waterway driving piece (22), wherein the waterway driving piece (22) is arranged on the supporting plate (21);

the waterway joint assembly is connected to the output end of the waterway driving piece (22), the waterway joint assembly comprises a waterway air inlet plug (23), a waterway air inlet joint (24) and a waterway blocking plug (25), the waterway air inlet plug (23) and the waterway blocking plug (25) are respectively used for blocking the waterway of the product, and the waterway air inlet plug (24) and the waterway air inlet plug (23) are communicated to inflate the waterway of the product.

3. The air tightness testing device according to claim 2, wherein said waterway testing unit (2) further comprises:

-a connection plate (26) to which the waterway connector assembly is connected, the connection plate (26) being movable along a first guide assembly (27);

the water channel driving piece (22) can drive the wedge block (28) to move along the second guide assembly (210), the connecting plate (26) is connected with the cam roller (29), and the guide direction of the first guide assembly (27) and the guide direction of the second guide assembly (210) are arranged at an included angle.

4. The tightness testing device according to claim 1, wherein said air circuit testing unit (3) comprises a plate fixed to said bottom plate (5):

the device comprises a first air passage driving piece (31), an air passage blocking head (32) connected to the output end of the first air passage driving piece (31) and a floating joint (33) connected between the first air passage driving piece (31) and the air passage blocking head (32), wherein the air passage blocking head (32) is used for blocking an air passage of a product;

the device comprises a second gas path driving part (34), a gas path air inlet plug (35) connected to the output end of the second gas path driving part (34), a gas path air inlet connector (36) connected to the gas path air inlet plug (35), and a floating connector (33) connected between the output end of the second gas path driving part (34) and the gas path air inlet plug (35), wherein the gas path air inlet plug (35) is used for blocking a product gas path, and the gas path air inlet plug (35) is communicated with the gas path air inlet plug (35) through the gas path air inlet connector (36) so as to charge the product gas path.

5. The tightness testing device according to claim 1, wherein said oil circuit testing unit (4) comprises a base plate (5) fixed to said base plate:

the oil circuit driving device comprises a first oil circuit driving piece (41) and an oil circuit blocking head (42) connected to the output end of the first oil circuit driving piece (41), wherein the oil circuit blocking head (42) is used for blocking an oil circuit of a product;

the oil way air inlet plug (44) is used for blocking the product oil way, and the oil way air inlet plug (45) is communicated with the oil way air inlet plug (44) to charge air to the product oil way.

6. The airtight testing device according to claim 1, wherein the positioning assembly (11) comprises a positioning carrier (111) and two positioning pins (112) arranged on the positioning carrier (111), the product (100) to be tested is provided with two positioning holes, and the two positioning pins (112) are correspondingly inserted into the two positioning holes.

7. The airtight testing device according to claim 6, wherein the positioning carrier (1) further comprises a sealing ring (113) provided on the positioning carrier (111), the product (100) to be tested is connected to the positioning carrier (111) in a sealing manner through the sealing ring (113), and the sealing ring (113) is adapted to the shape of the opening on the product (100) to be tested.

8. The airtight testing apparatus according to claim 1, wherein the clamping assembly (12) comprises a clamping driving member (121) and a connecting rod assembly (122), the connecting rod assembly (122) is connected to an output end and a fixed end of the clamping driving member (121), a pressing head (1221) is arranged on the connecting rod assembly (122), and the pressing head (1221) is used for pressing and connecting the product (100) to be tested.

9. The airtight testing device according to any one of claims 1 to 8, further comprising a frame body and a connecting assembly, wherein a handle (51) and a roller (52) are provided on the bottom plate (5), the bottom plate (5) is detachably connected to the frame body through the connecting assembly, the roller (52) is provided on a side of the bottom plate (5) facing the frame body, and the handle (51) is provided on a side of the bottom plate (5) facing away from the frame body.

10. A production line comprising a tightness testing device according to any of claims 1-9.

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