CN220366971U

CN220366971U - Air tightness testing equipment for automobile air inlet connector

Info

Publication number: CN220366971U
Application number: CN202321577269.7U
Authority: CN
Inventors: 廖元利
Original assignee: Dongguan Action Composites Co ltd
Current assignee: Dongguan Action Composites Co ltd
Priority date: 2023-06-19
Filing date: 2023-06-19
Publication date: 2024-01-19
Anticipated expiration: 2033-06-19

Abstract

The utility model discloses air tightness testing equipment of an automobile air inlet connector, which comprises a substrate, a product positioning device, an air tightness testing device and a size detecting component, wherein the product positioning device, the air tightness testing device and the size detecting component are arranged on the substrate; the product positioning device comprises a first matching piece and a second matching piece, wherein one end of the first matching piece is fixedly connected with one end of the automobile air inlet connecting piece, and the other end of the second matching piece is connected with the other end of the automobile air inlet connecting piece; the air tightness testing device comprises a PLC control box, a digital barometer, a timer and a switch assembly, wherein the digital barometer, the timer and the switch assembly are electrically connected to the PLC control box, an air inlet pipe and an air outlet pipe are respectively connected to the input end and the output end of the digital barometer, the PLC control box cuts off the input end of the digital barometer according to a first numerical value of the digital barometer and simultaneously starts the timer, and the PLC control box stops the timer according to a second numerical value of the digital barometer, and the first numerical value is larger than the second numerical value. The air tightness detection and the size detection are completed on the same equipment, so that the structure design is ingenious and the use is convenient.

Description

Air tightness testing equipment for automobile air inlet connector

Technical Field

The utility model relates to the technical field of air tightness testing equipment, in particular to air tightness testing equipment for an automobile air inlet connector.

Background

The automobile air inlet connector is used for communicating the inside of an automobile with the outside of the automobile, and because one end of the automobile air inlet connector is exposed outside the automobile, rainwater is required to be prevented from penetrating into the inside of the automobile under the condition of ventilation, therefore, the automobile air inlet connector is required to be subjected to an air tightness test after being manufactured so as to ensure the quality of a product, and the air tightness test generally comprises direct leakage detection, differential pressure direct detection, indirect leakage detection, differential pressure indirect detection and the like.

In the prior art, an air tightness test is generally carried out on an automobile air inlet connector by adopting a differential pressure direct detection method, namely, a certain pressure gas is introduced into a sealed automobile air inlet connector by adopting the differential pressure direct detection method, meanwhile, the same pressure gas is introduced into a standard tank body, the standard tank body is stationary for a period of time, the pressure in the standard tank body and the pressure of the automobile air inlet connector are observed, the micro differential pressure generated on a differential pressure sensor due to leakage is observed, and the leakage detector quantitatively calculates the leakage of an object to be tested according to the output change of the differential pressure sensor, so that whether a product is qualified or not is judged; however, due to the arrangement of the standard tank body, the leak detector and the differential pressure sensor, the equipment cost is high, the occupied space is large, and the automobile air inlet connector is also required to be subjected to size test, so that the two kinds of test equipment are required to be carried back and forth, the labor cost is increased, and the use is inconvenient.

Therefore, a new solution is needed to solve the above problems.

Disclosure of Invention

In view of the above, the present utility model aims at solving the drawbacks of the prior art, and its main objective is to provide an air tightness testing device for an air inlet connector of an automobile, which cuts off the input end of a digital air pressure meter according to a first value of the digital air pressure meter by providing a PLC control box, and simultaneously starts a timer, the PLC control box stops the timer according to a second value of the digital air pressure meter, the first value is greater than the second value, whether the air tightness is qualified is judged by observing the display duration of the timer, and the air tightness detection and the size detection are combined on one device by matching with the settings of a product positioning device and a size detection component, so that the carrying process between different detections is omitted, the structural design is ingenious, the use is convenient, and the setting of a pressure reducing device is used for micro-pressure air leakage, so that the digital air pressure meter is faster from the first value to the second value, and the air tightness detection efficiency is improved.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the air tightness testing equipment of the automobile air inlet connector comprises a substrate, a product positioning device, an air tightness testing device and a size detecting component, wherein the product positioning device, the air tightness testing device and the size detecting component are arranged on the substrate; wherein:

the product positioning device comprises a first mounting seat, a first matching piece, a second mounting seat and a second matching piece, wherein the first matching piece is arranged on the first mounting seat and is fixedly connected with one end of an automobile air inlet supply connecting piece;

the air tightness testing device comprises a PLC control box, a digital barometer, a timer and a switch assembly, wherein the digital barometer, the timer and the switch assembly are electrically connected with the PLC control box, the input end and the output end of the digital barometer are respectively connected with an air inlet pipe and an air outlet pipe, a pressure reducing device for reducing the air pressure of an air source is arranged on the air inlet pipe, the PLC control box cuts off the input end of the digital barometer according to a first numerical value of the digital barometer and simultaneously starts the timer, the PLC control box stops the timer according to a second numerical value of the digital barometer, the first numerical value is larger than the second numerical value, the air outlet pipe is connected with a first mounting seat, and an air passage for communicating the air outlet pipe with the inside of an automobile air inlet connector is arranged on the first mounting seat;

the size detection assembly comprises a plurality of first dial indicator positioning seats and first dial indicators for detecting the size of the outer periphery side of the automobile air inlet connecting piece, wherein the first dial indicator positioning seats are detachably arranged, whether the air tightness is qualified or not is judged by observing the display time length of the timer, and size detection is carried out by matching with the arrangement of the product positioning device and the size detection assembly, the air tightness detection and the size detection are completed on one device, the carrying process between different detection is omitted, the structural design is ingenious, the use is convenient, the pressure reducing device is arranged, micro-pressure air leakage is carried out, the digital air pressure meter is enabled to be faster from a first numerical value to a second numerical value, and the air tightness detection efficiency is improved.

As a preferable scheme, the input end of the air inlet pipe is provided with an air source access port connected with an air source, and the pressure reducing device is arranged close to the air source access port.

As a preferred embodiment, the pressure reducing device includes two barometers.

As a preferable scheme, one end of the air outlet pipe, which is close to the first mounting seat, is provided with a mechanical barometer, and the mechanical barometer is close to the first mounting seat and is closer to the automobile air inlet connector than the digital barometer, so that the mechanical barometer can obtain more accurate air pressure in the automobile air inlet connector.

As a preferred scheme, the second matching piece is a rubber piece, the rubber piece is arranged on the second mounting seat through the XYZ shaft moving mechanism, the XYZ shaft moving mechanism comprises a sliding adjusting device and an XYZ shaft adjusting device for driving the sliding adjusting device to move, the sliding adjusting device comprises a fixed seat and a sliding connecting seat which is slidably arranged on the fixed seat, the second matching piece is arranged on the sliding connecting seat, the rubber piece is movably arranged, the rubber piece can be assembled at a plurality of positions, and the air tightness test is carried out at a plurality of positions in cooperation with the air tightness test device, so that the influence of assembly errors on air tightness can be reduced.

As a preferable scheme, the XYZ-axis adjusting device comprises a mounting plate, a Y-axis moving plate arranged on the mounting plate, a first adjusting screw for driving the Y-axis moving plate to move along the Y-axis on the mounting plate, an X-axis moving plate arranged on the Y-axis moving plate, a second adjusting screw for driving the X-axis moving plate to move along the X-axis on the Y-axis moving plate, a adapting seat arranged on the X-axis moving plate, a Z-axis moving plate arranged on the adapting seat, and a third adjusting screw for driving the Z-axis moving plate to move along the Z-axis on the adapting seat, wherein the fixing seat is arranged on the Z-axis moving plate.

As a preferable scheme, one end of the fixed seat, which is close to the first matching piece, is provided with a fixed position jack for fixing the second matching piece on the automobile air inlet connecting piece, the other end of the fixed seat is provided with an installation position jack for installing and avoiding the automobile air inlet connecting piece, and the sliding connecting seat passes through the bolt to penetrate through the fixed position jack or the installation position jack so as to fix the sliding connecting seat at a corresponding position.

As a preferable scheme, the substrate is provided with a first support, a second support, a third support, a fourth support, a fifth support and a sixth support, wherein the first support is arranged beside the first mounting seat, the second support, the third support, the fourth support and the fifth support are positioned between the first matching piece and the second matching piece, and the sixth support is arranged beside the second matching piece; wherein:

the first support and the sixth support are respectively provided with a turnover mechanism, and the turnover mechanisms are respectively provided with a first dial indicator positioning seat for detecting the size of the upper surface of the automobile air inlet connector;

the second support and the third support are respectively provided with a first dial indicator positioning seat which is used for detecting the sizes of the front side face and the rear side face of the automobile air inlet connecting piece;

the fourth support and the fifth support are respectively provided with a first dial indicator positioning seat for detecting the size of the lower surface of the automobile air inlet connector;

the first dial indicator positioning seat is provided with a positioning jack for inserting the first dial indicator.

As a preferred scheme, the first dial indicator positioning seats on the second support, the fifth support and the sixth support are respectively provided with two positioning jacks, one of the two positioning jacks, which is close to the second matching piece, is detachably inserted with a limiting pin for detecting whether the second matching piece is installed in place on the other end of the automobile air inlet connecting piece, the positioning jacks can be used for carrying out size detection on the first dial indicator, and can be used for detecting whether the second matching piece is installed in place or not, so that the structure design is ingenious.

As a preferable scheme, the size detection assembly further comprises a plurality of second dial indicator positioning seats and a second dial indicator for detecting the sizes of the upper surface, the front side surface and the rear side surface of one end of the automobile air inlet connecting piece, wherein the plurality of second dial indicator positioning seats are arranged on the periphery of the first mounting seat.

Compared with the prior art, the utility model has obvious advantages and beneficial effects, and in particular, the technical scheme can be as follows:

the method is mainly characterized in that the PLC control box is arranged to cut off the input end of the digital barometer according to the first numerical value of the digital barometer and simultaneously start the timer, the PLC control box stops the timer according to the second numerical value of the digital barometer, the first numerical value is larger than the second numerical value, whether the air tightness is qualified or not is judged by observing the display duration of the timer, and the air tightness detection and the size detection are combined on one device by matching with the setting of the product positioning device and the size detection assembly, so that the carrying process between different detection is omitted, the structure design is ingenious, the use is convenient, the setting of the pressure reducing device is used for carrying out micro-pressure air leakage, the digital barometer is enabled to be faster from the first numerical value to the second numerical value, and the air tightness detection efficiency is improved.

In order to more clearly illustrate the structural features and efficacy of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic perspective view of a preferred embodiment of the present utility model (including an automotive air intake connector state);

FIG. 2 is a schematic perspective view of a preferred embodiment of the present utility model (without the automotive air intake connector);

FIG. 3 is a partial assembly view of a preferred embodiment of the present utility model (including an automotive air intake connector state);

FIG. 4 is another partial assembly view of the preferred embodiment of the present utility model (including an automotive air intake connector state);

fig. 5 is a partial enlarged view at a in fig. 4.

The attached drawings are used for identifying and describing:

10. base plate 11, first support

12. Second support 13, third support

14. Fourth support 15, fifth support

16. Sixth support 17 and turnover mechanism

20. Product positioning device 21 and first mounting seat

22. First fitting 23, second mount

24. Second fitting 30 and air tightness testing device

31. PLC control box 32, digital barometer

33. Timer 34, switch assembly

341. Start switch 342, scram switch

35. Air inlet pipe 351 and pressure reducing device

352. Air source inlet 36 and air outlet pipe

361. Mechanical barometer 40, size detection assembly

41. First dial indicator positioning seat 411 and positioning jack

42. First dial indicator 43 and limiting pin

44. Second dial indicator positioning seat 45 and second dial indicator

451. Mounting base 50, moving rack

60. Storage device 70 and automobile air inlet connector

80. XYZ-axis moving mechanism 81 and sliding adjusting device

811. Fixing base 8111, fixed position jack

8112. Mounting position jack 812 and sliding connection seat

813. Latch 814, stop

815. Connecting bracket 82 and XYZ shaft adjusting device

821. Mounting plate 822, Y-axis moving plate

823. First adjusting screw 824, X-axis moving plate

825. Second adjusting screw 826 and adapter

827. Z-axis moving plate 828, third adjusting screw.

Detailed Description

First, it should be noted that, in the description of the present utility model, the azimuth or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

Referring to fig. 1 to 5, a specific structure of a preferred embodiment of the present utility model is shown, which includes a substrate 10, a product positioning device 20, an air tightness testing device 30 and a dimension detecting assembly 40 disposed on the substrate 10.

The substrate 10 is arranged on a moving frame 50, the moving frame 50 comprises a frame main body and moving wheels arranged at the bottom of the frame main body, and the moving frame 50 is arranged to facilitate the transportation of the substrate 10; in this embodiment, the top of the base plate 10 is further provided with a storage device 60 for storing the first dial indicator 42, the second dial indicator 45, the stop pin 43, etc., and the storage device 60 may be a storage box or a placement seat.

The product positioning device 20 comprises a first mounting seat 21, a first matching piece 22, a second mounting seat 23 and a second matching piece 24, wherein the first matching piece 22 is arranged on the first mounting seat 21 and is fixedly connected with one end of an automobile air inlet supply connecting piece 70, the second matching piece 24 is arranged on the second mounting seat 23 and is connected with the other end of the automobile air inlet supply connecting piece 70, and the first mounting seat 21 and the second mounting seat 23 are both fixed on the substrate 10;

specifically, the second matching piece 24 is a rubber piece, the rubber piece is arranged on the second mounting seat 23 through the XYZ-axis moving mechanism 80, the XYZ-axis moving mechanism 80 comprises a sliding adjusting device 81 and an XYZ-axis adjusting device 82 for driving the sliding adjusting device 81 to move, the sliding adjusting device 81 comprises a fixed seat 811 and a sliding connecting seat 812 slidably arranged on the fixed seat 811, the second matching piece 24 is arranged on the sliding connecting seat 812, and the rubber piece is movably arranged, so that the rubber piece can be assembled at a plurality of positions, and the air tightness test device 30 is matched for air tightness test at a plurality of positions, so that the influence of assembly errors on air tightness can be reduced; the first matching piece 22 is fixed on the first mounting seat 21 through a torque screw, and the torque screw can be screwed by a torque wrench;

the XYZ-axis adjusting device 82 comprises a mounting plate 821, a Y-axis moving plate 822 arranged on the mounting plate 821, a first adjusting screw 823 for driving the Y-axis moving plate 822 to move along the Y-axis on the mounting plate 821, an X-axis moving plate 824 arranged on the Y-axis moving plate 822, a second adjusting screw 825 for driving the X-axis moving plate 824 to move along the X-axis on the Y-axis moving plate 822, a switching seat 826 arranged on the X-axis moving plate 824, a Z-axis moving plate 827 arranged on the switching seat 826, and a third adjusting screw 828 for driving the Z-axis moving plate 827 to move along the Z-axis on the switching seat 826, wherein the fixing seat 811 is arranged on the Z-axis moving plate 827;

the fixed seat 811 is provided with a fixed position jack 8111 for fixing the second fitting 24 to the automobile air inlet connector 70 at one end close to the first fitting 22, the other end of the fixed seat 811 is provided with a mounting position jack 8112 for preventing the automobile air inlet connector 70 from being mounted and retracted, the sliding connecting seat 812 passes through the fixed position jack 8111 or the mounting position jack 8112 through a bolt 813 so as to fix the sliding connecting seat 812 at a corresponding position, a stop piece 814 for preventing the sliding connecting seat 812 from being disengaged is further arranged beside the fixed position jack 8111, and the fixed seat 811 is arranged on the Z-axis moving plate 827 through a connecting bracket 815.

The air tightness testing device 30 comprises a PLC control box 31, a digital air pressure meter 32, a timer 33 and a switch assembly 34, wherein the digital air pressure meter 32, the air inlet pipe 35 and the air outlet pipe 36 are respectively connected with the input end and the output end, the air inlet pipe 35 is provided with a pressure reducing device 351 for reducing the air pressure of an air source, the PLC control box 31 cuts off the input end of the digital air pressure meter 32 according to a first value of the digital air pressure meter 32 and simultaneously starts the timer 33, the PLC control box 31 stops the timer 33 according to a second value of the digital air pressure meter 32, the first value is larger than the second value, the air outlet pipe 36 is connected with the first mounting seat 21, and the first mounting seat 21 is provided with an air passage for communicating the air outlet pipe 36 with the inside of the automobile air inlet connector 70;

specifically, an air source inlet 352 connected with an air supply source is provided at the input end of the air inlet pipe 35, and the pressure reducing device 351 is disposed close to the air source inlet 352; the pressure reducing device 351 comprises two air pressure adjusting meters; preferably, a mechanical barometer 361 is disposed at an end of the air outlet pipe 36 near the first mounting seat 21, and the mechanical barometer 361 is disposed near the first mounting seat 21 and is closer to the air inlet connector 70 than the digital barometer 32, so that the mechanical barometer 361 can obtain more accurate air pressure in the air inlet connector 70.

The size detection assembly 40 comprises a plurality of first dial indicator positioning seats 41 and a first dial indicator 42 for detecting the size of the outer periphery side of the automobile air inlet connector 70, the first dial indicator 42 is detachably arranged on the first dial indicator positioning seats 41, whether the air tightness is qualified or not is judged by observing the display time length of the timer 33, size detection is carried out by matching with the arrangement of the product positioning device 20 and the size detection assembly 40, the air tightness detection and the size detection are completed on one device, the carrying process between different detections is omitted, the structure design is ingenious, the use is convenient, the arrangement of the pressure reducing device 351 carries out micro-pressure air leakage, the digital air pressure meter 32 is enabled to be from a first numerical value to a second numerical value more quickly, and the air tightness detection efficiency is improved;

specifically, the substrate 10 is provided with a first support 11, a second support 12, a third support 13, a fourth support 14, a fifth support 15 and a sixth support 16, the first support 11 is disposed beside the first mounting seat 21, the second support 12, the third support 13, the fourth support 14 and the fifth support 15 are located between the first mating member 22 and the second mating member 24, and the sixth support 16 is disposed beside the second mating member 24; wherein:

the first support 11 and the sixth support 16 are provided with a turnover mechanism 17, the turnover mechanism 17 is a mature technology in the art, and not described in detail herein, the turnover mechanism 17 needs to be opened before the installation of the automobile air inlet connector 70 so as to facilitate the installation of the automobile air inlet connector 70, and the turnover mechanism 17 is provided with a first dial indicator positioning seat 41 for detecting the size of the upper surface of the automobile air inlet connector 70; the second support 12 and the third support 13 are respectively provided with a first dial indicator positioning seat 41 for respectively detecting the sizes of the front side surface and the rear side surface of the automobile air inlet connector 70; the fourth support 14 and the fifth support 15 are respectively provided with a first dial indicator positioning seat 41 for detecting the size of the lower surface of the automobile air inlet connector 70; the first dial indicator positioning seat 41 is provided with a positioning jack 411 for inserting the first dial indicator 42;

in this embodiment, the first dial indicator positioning seats 41 on the second support 12, the fifth support 15 and the sixth support 16 each have two positioning insertion holes 411, one of the two positioning insertion holes 411, which is close to the second matching piece 24, is detachably inserted with a limiting pin 43 for detecting whether the second matching piece 24 is mounted in place on the other end of the automobile air inlet connector 70, and the positioning insertion holes 411 can be used for size detection of the first dial indicator 42 and whether the second matching piece 24 is mounted in place, so that the structural design is ingenious; and, the first dial indicator positioning seat 41 on the fourth support 14 has two positioning insertion holes 411, and the first dial indicator positioning seat 41 on the sixth support 16 has three positioning insertion holes 411;

in addition, the size detecting assembly 40 further includes a plurality of second dial indicator positioning seats 44 and a second dial indicator 45 for detecting the sizes of the upper surface, the front side surface and the rear side surface of one end of the air inlet connector 70 of the automobile, wherein the plurality of second dial indicator positioning seats 44 are arranged on the periphery of the first mounting seat 21, in this embodiment, the first dial indicator 42 does not include a mounting base, that is, the size detecting can be performed only after the first dial indicator 42 is inserted into the positioning jack 411, the second dial indicator 45 is provided with a mounting base 451, and the size detecting can be directly performed after the mounting base 451 is arranged on the second dial indicator positioning seat 44 matched with the second dial indicator positioning seat; the switch assembly 34 includes a start switch 341 and a scram switch 342.

Detailed description the air tightness test procedure of this embodiment is as follows:

the first step, connecting the standard gas source of the factory to the gas source inlet 352, and the gas source flows to the input end of the digital barometer 32 through two barometers; wherein the standard gas source of the factory is usually 7000mbar, and the pressure is reduced to 100mbar through two pressure regulating meters;

step two, the starting switch 341 is pressed, and the air source flows out from the air outlet pipe 36 to the automobile air inlet connector 70 after entering the digital air pressure meter 32, so that air inflation is started; when the value of the digital barometer 32 reaches a first value, which is 50mbar, the plc control box 31 automatically shuts off the air flow and no longer inflates, and the timer 33 automatically starts to count;

third, waiting for the air pressure in the air inlet connection 70 of the vehicle to drop from the first value to the second value, the second value being 40mbar, the timer 33 automatically stopping the timing;

finally, the observation timer 33 displays the time period, and if the time period is 30 seconds or longer, the automobile air inlet connector 70 is qualified, otherwise, the automobile air inlet connector is not qualified.

The design focus of the utility model is that:

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present utility model are still within the scope of the technical solutions of the present utility model.

Claims

1. The air tightness testing equipment of the automobile air inlet connector is characterized by comprising a substrate, a product positioning device, an air tightness testing device and a size detecting assembly, wherein the product positioning device, the air tightness testing device and the size detecting assembly are arranged on the substrate; wherein:

the size detection assembly comprises a plurality of first dial indicator positioning seats and a first dial indicator for detecting the size of the outer peripheral side of the automobile air inlet connector, and the first dial indicator is detachably arranged on the first dial indicator positioning seats.

2. The air tightness testing apparatus of an automotive air inlet connection according to claim 1, wherein: the input end of the air inlet pipe is provided with an air source access port connected with an air source, and the pressure reducing device is arranged close to the air source access port.

3. The air tightness testing apparatus of an automobile air inlet connector according to claim 2, wherein: the pressure reducing device comprises two air pressure adjusting meters.

4. The air tightness testing apparatus of an automotive air inlet connection according to claim 1, wherein: a mechanical barometer is arranged at one end of the air outlet pipe, which is close to the first installation seat.

5. The air tightness testing apparatus of an automotive air inlet connection according to claim 1, wherein: the second matching piece is a rubber piece, the rubber piece is arranged on the second mounting seat through an XYZ shaft moving mechanism, the XYZ shaft moving mechanism comprises a sliding adjusting device and an XYZ shaft adjusting device for driving the sliding adjusting device to move, the sliding adjusting device comprises a fixed seat and a sliding connecting seat which is slidably arranged on the fixed seat, and the second matching piece is arranged on the sliding connecting seat.

6. The air tightness testing apparatus of an automotive air inlet connector according to claim 5, wherein: the XYZ-axis adjusting device comprises a mounting plate, a Y-axis moving plate arranged on the mounting plate, a first adjusting screw rod for driving the Y-axis moving plate to move along the Y axis on the mounting plate, an X-axis moving plate arranged on the Y-axis moving plate, a second adjusting screw rod for driving the X-axis moving plate to move along the X axis on the Y-axis moving plate, a adapter seat arranged on the X-axis moving plate, a Z-axis moving plate arranged on the adapter seat, and a third adjusting screw rod for driving the Z-axis moving plate to move along the Z axis on the adapter seat, wherein the fixed seat is arranged on the Z-axis moving plate.

7. The air tightness testing apparatus of an automotive air inlet connector according to claim 5, wherein: the one end that is close to first cooperation spare on the fixing base is equipped with the fixed position jack that is used for being fixed in the car air inlet connecting piece with the second cooperation spare, the other end of fixing base is equipped with the mounted position jack that supplies car air inlet connecting piece installation to dodge, the fixed position jack or the mounted position jack are worn to establish through the bolt to the sliding connection seat to fix the sliding connection seat in corresponding position.

8. The air tightness testing apparatus of an automotive air inlet connection according to claim 1, wherein: the substrate is provided with a first support, a second support, a third support, a fourth support, a fifth support and a sixth support, wherein the first support is arranged beside the first mounting seat, the second support, the third support, the fourth support and the fifth support are positioned between the first matching piece and the second matching piece, and the sixth support is arranged beside the second matching piece; wherein:

9. The air tightness testing apparatus of an automotive air inlet connection according to claim 8, wherein: the first dial indicator positioning seats on the second support, the fifth support and the sixth support are respectively provided with two positioning jacks, one of the two positioning jacks, which is close to the second matching piece, is detachably inserted with a limiting pin for detecting whether the second matching piece is installed in place on the other end of the automobile air inlet connecting piece.

10. The air tightness testing apparatus of an automotive air inlet connection according to claim 1, wherein: the size detection assembly further comprises a plurality of second dial indicator positioning seats and second dial indicators for detecting the sizes of the upper surface, the front side surface and the rear side surface of one end of the automobile air inlet connecting piece, and the plurality of second dial indicator positioning seats are arranged on the periphery of the first mounting seat.