An air tightness testing device for air compressor cylinder head

Abstract

The present invention relates to an air tightness testing device for an air compressor cylinder head in the field of air tightness testing. Before testing, the cylinder head is quickly positioned and installed by a positioning column, and then a sealing mechanism is used to drive a sealing screw to seal the air pipe of the cylinder head. Finally, the cylinder head is squeezed and sealed by the sealing mechanism, thereby realizing rapid installation and sealing operations before the cylinder head is tested, replacing tedious manual operations. During testing, efficient injection of high-pressure gas is achieved through an air injection pipe and a high-pressure air pump, and an array microphone is used to efficiently detect air tightness and leakage positions. In addition, color powder is released in a chamber where leakage is detected, and the exhaust airflow is used to mark the leakage pores with the color powder, so as to facilitate subsequent identification and processing.

Description

Technical Field

[0001] The invention relates to a cylinder cover air tightness detection device, in particular to an air tightness detection device for an air compressor cylinder cover which is applied in the field of air tightness detection. Background Art

[0002] The air compressor cylinder head is a sealing cover installed on the upper end of the air compressor compression cylinder and used to connect the air inlet and outlet pipes. Since it is mainly responsible for sealing the cylinder and conducting the inlet and outlet air flows, its sealing directly determines the working efficiency of the air compressor cylinder. During the production process, the finished cylinder head needs to be tested for air tightness.

[0003] The existing cylinder head sealing detection device is to manually seal the cylinder head and then immerse the sealed cylinder head in a water pool to observe the bubbles. The existing testing method requires sealing the irregular bottom of the cylinder head and the intake and outlet pipes on both sides of the cylinder head. The operation is cumbersome and relies on manual observation of the bubble situation. It is difficult to detect the bubbles generated by particularly small leakage pores. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing cylinder head sealing detection device requires manual sealing of the cylinder head and observation of the bubble situation, which is cumbersome to operate and difficult to find small leakage pores.

[0005] In order to solve the above problems, the present invention provides an air tightness detection device for the cylinder head of an air compressor, comprising an operating table; an adapter seat for supporting the cylinder head is fixedly connected to the operating table, and a sealing gasket is installed between the adapter seat and the cylinder head, a plurality of positioning columns penetrating the bolt holes of the cylinder head are fixedly connected to the adapter seat, and a sealing mechanism for sealing the air pipes on both sides of the cylinder head is provided above the adapter seat; the sealing mechanism comprises a pair of sealing screws relatively arranged on both sides of the cylinder head, the outer ends of the sealing screws are sleeved with a prismatic cylinder horizontally slidably connected thereto, and an extrusion spring abutting against the end of the sealing screw is nested in the prismatic cylinder; the prismatic cylinder is rotatably connected to a moving arm, and a pair of moving arms are provided. A bidirectional screw module is connected to the upper end of the arm, and the bidirectional screw module drives a pair of sealing screws to move toward or away from each other through the moving arm and the prismatic tube. A lifting cylinder is fixedly connected to the upper end of the bidirectional screw module, and the lifting cylinder is fixedly connected to the operating table through a support frame; the prismatic tube is connected to a vertical transmission shaft rotatably connected to the moving arm through a transmission gear set, and a rolling gear is fixedly connected to the upper end of the vertical transmission shaft, and the rolling gear is meshed with a rack plate fixedly connected to the bidirectional screw module; the adapter seat is provided with a pair of air injection cavities respectively connected to a pair of chambers in the cylinder cover, and the air injection cavities are connected to air injection pipes, and each air injection pipe is respectively connected to a high-pressure air pump through an electromagnetic valve.

[0006] In the above-mentioned air tightness detection equipment for the cylinder head of the air compressor, the cylinder head is automatically and quickly sealed through the adapter and the sealing mechanism, and the leakage situation and leakage position are detected by using a high-pressure air pump and an array microphone, replacing manual operation and observation.

[0007] As a further improvement of the present application, a pigment spraying mechanism arranged opposite to the gas injection tube is installed in the gas injection cavity, and the pigment spraying mechanism includes a storage barrel, a conical cavity for storing pigment powder is opened on the upper part of the storage barrel, and the lower end of the conical cavity is connected to a connecting cavity through a connecting hole, and a plug-in tube slidably connected to the storage barrel is nested in the connecting cavity, and the plug-in tube is connected to the lower end of the storage barrel through a connecting spring; a sealing block is nested in the connecting hole, and the sealing block is fixedly connected to an iron core rod extending into the plug-in tube and connected to the plug-in tube, and an electromagnetic coil cooperating with the iron core rod is provided in the shell wall of the storage barrel.

[0008] As a further improvement of the present application, an impeller is fixedly sleeved on the lower part of the core rod, a sleeve rotatably connected to the impeller is sleeved on the outer side of the impeller, and the sleeve is fixedly connected to the inner wall of the plug-in tube through connecting rods equidistantly distributed around the circumference; the core rod is located above the blocking block and is fixedly connected to a guide cone, the guide cone is a conical structure with the tip facing downward, and guide plates equidistantly distributed around the circumference are fixedly connected to the conical surface of the guide cone.

[0009] As a further improvement of the present application, the bidirectional screw module includes a sliding frame which is sleeved on the upper part of the movable arm and slidably connected thereto, a bidirectional screw threadedly connected to a pair of movable arms is nested in the sliding frame, and the bidirectional screw extends to the end of the sliding frame and is connected to a screw motor.

[0010] As a further improvement of the present application, the rack plate is fixedly connected to the sliding frame, the rack plate passes through the moving arm and is slidably connected to the moving arm, and the vertical transmission shaft is arranged parallel to the moving arm and is rotatably connected to the inside of the moving arm.

[0011] As a further improvement of the present application, the inner end of the plugging screw is in the shape of a horizontal truncated cone and the outer end is provided with a prism block, a prism cavity is provided in the prism tube for the prism block to slide laterally, and the extrusion spring is nested in the prism cavity.

[0012] As a further improvement of the present application, an abutment ring is provided in the middle of the plugging screw, and a sealing airbag is bonded to the inner side of the abutment ring, and the sealing airbag is an annular airbag.

[0013] As a further improvement of the present application, the conical cavity is a conical cavity structure with an open upper end and a pointed end facing downward, the connecting hole is a conical cone-shaped structure, the blocking block is a truncated cone-shaped structure with the upper part adapted to the connecting hole and symmetrical upper and lower parts, the lower end of the core rod is a pointed structure, the storage barrel is fixedly connected to the inner wall of the air injection cavity by a mounting rod, and an air pressure sensor is fixedly connected to the inner wall of the air injection cavity.

[0014] To summarize, the present invention uses an adapter seat and a sealing mechanism equipped with a positioning column and a sealing gasket. Before detection, the cylinder head is quickly positioned and installed by the positioning column, and then the sealing mechanism is used to drive the sealing screw to seal the air pipe of the cylinder head. Finally, the cylinder head is squeezed and sealed by the sealing mechanism, thereby realizing rapid installation and sealing operations before cylinder head detection, replacing tedious manual operations. During detection, efficient injection of high-pressure gas is achieved through the gas injection pipe and the high-pressure air pump, and the array microphone is used to efficiently detect air tightness and leakage positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0016] Figure 2 This is a schematic diagram of the transverse cross-sectional structure of the present application;

[0017] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0018] Figure 4 This is a schematic diagram of the explosive assembly structure of the plugging screw and the prismatic cylinder in this application;

[0019] Figure 5 This is a schematic diagram of the exploded assembly of the cylinder head and the adapter in this application;

[0020] Figure 6 It is a schematic diagram of the explosion assembly of the blocking mechanism in this application;

[0021] Figure 7 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0022] Figure 8 It is a schematic cross-sectional structure diagram of the paint spraying mechanism in this application;

[0023] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure at C in the middle;

[0024] Fig.10 It is a three-dimensional assembly schematic diagram of the core rod in this application;

[0025] Fig.11 Schematic diagram of color powder spraying state.

[0026] Description of the numbers in the figure:

[0027] 1. Operating table; 2. Adapter seat; 201. Air injection chamber; 202. Positioning column; 3. Cylinder head; 301. Chamber; 302. Air pipe; 4. Sealing pad; 5. Air injection pipe; 6. Solenoid valve; 7. High-pressure air pump; 8. Sealing screw; 801. Abutment ring; 802. Prism block; 9. Sealing air bag; 10. Prism tube; 1001. Extrusion spring; 11. Moving arm; 12. Sliding frame; 13. Bidirectional screw; 14. Screw motor; 15. Transmission gear set; 16. Vertical Drive shaft; 17. Rolling gear; 18. Rack plate; 19. Lifting cylinder; 20. Array microphone; 21. Support frame; 22. Storage barrel; 2201. Conical cavity; 2202. Connecting hole; 2203. Connecting cavity; 23. Blocking block; 24. Core rod; 25. Plug-in tube; 26. Connecting spring; 27. Electromagnetic coil; 28. Impeller; 29. ​​Guide cone; 2901. Guide plate; 30. Mounting rod; 31. Air pressure sensor; 32. Sleeve; 33. Connecting rod. DETAILED DESCRIPTION

[0028] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0029] The first implementation method:

[0030] Figure 1-6 An air tightness detection device for an air compressor cylinder head is shown, comprising an operating table 1; an adapter seat 2 for supporting a cylinder head 3 is fixedly connected to the operating table 1, and a sealing gasket 4 is installed between the adapter seat 2 and the cylinder head 3; a plurality of positioning columns 202 penetrating bolt holes of the cylinder head 3 are fixedly connected to the adapter seat 2; a blocking mechanism for blocking air pipes 302 on both sides of the cylinder head 3 is provided above the adapter seat 2;

[0031] The blocking mechanism includes a pair of blocking screws 8 relatively arranged on both sides of the cylinder cover 3, the outer end of the blocking screw 8 is sleeved with a prismatic tube 10 horizontally slidably connected thereto, and an extrusion spring 1001 abutting against the end of the blocking screw 8 is nested in the prismatic tube 10; the prismatic tube 10 is rotatably connected to a moving arm 11, and a pair of moving arms 11 are connected to a bidirectional screw module at the upper end, and the bidirectional screw module drives the pair of blocking screws 8 to move toward or away from each other through the moving arm 11 and the prismatic tube 10, and the upper end of the bidirectional screw module is fixedly connected to a lifting cylinder 19, and the lifting cylinder 19 is fixedly connected to the operating table 1 through a support frame 21; the prismatic tube 10 is connected to the movable arm 11, and the upper end of the pair of movable arms 11 is connected to a bidirectional screw module, and the bidirectional screw module drives the pair of blocking screws 8 to move toward or away from each other through the movable arm 11 and the prismatic tube 10, and the upper end of the bidirectional screw module is fixedly connected to a lifting cylinder 19, and the lifting cylinder 19 is fixedly connected to the operating table 1 through a support frame 21; A vertical transmission shaft 16 rotatably connected to the moving arm 11 is connected through the transmission gear set 15, and a rolling gear 17 is fixedly connected to the upper end of the vertical transmission shaft 16. The rolling gear 17 meshes with a rack plate 18 fixedly connected to the bidirectional screw module. When the moving arm 11 moves horizontally, the rolling gear 17 rolls on the rack plate 18 and drives the prism tube 10 to rotate through the vertical transmission shaft 16 and the transmission gear set 15. The prism tube 10 drives the blocking screw 8 to rotate, so that the blocking screw 8 is screwed into the air pipe 302 of the cylinder head 3; the lower end of the bidirectional screw module is fixedly connected to an array microphone 20 arranged above the cylinder head 3;

[0032] The adapter seat 2 is provided with a pair of gas injection cavities 201 respectively connected with a pair of chambers 301 in the cylinder head 3 . The gas injection cavities 201 are connected with gas injection pipes 5 . Each gas injection pipe 5 is respectively connected with a high-pressure air pump 7 through a solenoid valve 6 .

[0033] For details, please refer to Figure 2 and Figure 6 , including the following steps:

[0034] Step 1, placing the cylinder head 3; aligning the bolt holes of the cylinder head 3 with the positioning columns 202 of the adapter 2 and placing the cylinder head 3 on the sealing gasket 4;

[0035] Step 2: block the air pipe 302 and squeeze it to fit; start the lifting cylinder 19, which drives the blocking mechanism to move downward, so that the blocking screw 8 is aligned with the air pipe 302 of the cylinder head 3, and then start the bidirectional screw module, so that the blocking screw 8 moves towards each other and rotates at the same time, until the blocking screw 8 is inserted into the air pipe 302 to seal the air pipe, and finally, start the lifting cylinder 19, which squeezes the cylinder head 3 downward through the blocking mechanism, so that the cylinder head 3 is tightly fitted with the adapter 2 through the sealing gasket 4;

[0036] Step three, check the air tightness; start the high-pressure air pump 7 and the array microphone 20, the high-pressure air pump 7 injects the high-pressure gas into the two injection chambers 201 through the gas injection pipe 5, and the high-pressure gas entering the two gas injection chambers 201 enters the two chambers 301 of the cylinder head 3 until the set gas injection pressure is reached; the array microphone 20 detects the sound waves in the environment outside the cylinder head 3, and then determines the leakage location.

[0037] It should be noted that a plurality of microphone units distributed in a circle are installed in the array microphone 20, so as to facilitate detection of the intensity of sound waves and the location of the source of sound waves, and further facilitate determination of the location of the leaking chamber 301.

[0038] Compared with the traditional cylinder head sealing detection device, the present invention uses an adapter seat 2 equipped with a positioning column 202 and a sealing gasket 4 and a sealing mechanism. Before the detection, the cylinder head 3 is quickly positioned and installed through the positioning column 202, and then the sealing mechanism is used to drive the sealing screw 8 to seal the air pipe 302 of the cylinder head 3. Finally, the cylinder head 3 is squeezed and sealed by the sealing mechanism, thereby realizing the rapid installation and sealing of the cylinder head 3 before the detection, replacing the tedious manual operation; during the detection, the efficient injection of high-pressure gas is realized through the gas injection pipe 5 and the high-pressure air pump 7, and the array microphone 20 is used to efficiently detect the air tightness and the leakage position.

[0039] See also Figure 6 The bidirectional screw module includes a sliding frame 12 which is sleeved on the upper part of the moving arm 11 and slidably connected thereto, a bidirectional screw 13 which is threadedly connected to a pair of moving arms 11 is nested in the sliding frame 12, and the bidirectional screw 13 extends to the end of the sliding frame 12 and is connected to a screw motor 14.

[0040] Specifically, the screw motor 14 drives the bidirectional screw 13 to rotate, and the bidirectional screw 13 drives a pair of movable arms 11 to move toward or away from each other, thereby realizing the movement of the blocking screw 8 toward or away from each other.

[0041] See also Figure 2 The rack plate 18 is fixedly connected to the sliding frame 12 , the rack plate 18 passes through the moving arm 11 and is slidably connected to the moving arm 11 , and the vertical transmission shaft 16 is arranged parallel to the moving arm 11 and is rotatably connected to the inside of the moving arm 11 .

[0042] Specifically, the movable arm 11 and the rolling gear 17 have better moving stability.

[0043] See also Figure 4 The inner end of the plugging screw 8 is in a horizontal truncated cone shape and a prism block 802 is provided at the outer end. A prism cavity is provided in the prism cylinder 10 for the prism block 802 to slide horizontally, and the extrusion spring 1001 is nested in the prism cavity.

[0044] Specifically, when the prism tube 10 rotates, the prism block 802 drives the sealing screw 8 to rotate as a whole. At the same time, the extrusion spring 1001 makes the sealing screw 8 elastically fit on the side wall of the trachea 302 when in contact with the side wall of the trachea 302, making it easy for the sealing screw 8 to be screwed into the trachea 302.

[0045] See also Figure 3 and Figure 4A butt ring 801 is provided in the middle of the plugging screw 8, and a sealing airbag 9 is bonded to the inner side of the butt ring 801, and the sealing airbag 9 is an annular airbag.

[0046] Specifically, as the blocking screw 8 is gradually screwed into the trachea 302 , the abutment ring 801 squeezes the sealing airbag 9 , so that the air is filled between the trachea 302 and the abutment ring 801 , further improving the blocking effect on the trachea 302 .

[0047] Second implementation method:

[0048] Figure 2 and Figure 7-11 An air tightness detection device for an air compressor cylinder head is shown. On the basis of the first embodiment, a pigment spraying mechanism arranged opposite to the gas injection pipe 5 is installed in the gas injection chamber 201, and the pigment spraying mechanism includes a storage barrel 22. A conical chamber 2201 for storing pigment powder is opened on the upper part of the storage barrel 22. The lower end of the conical chamber 2201 is connected to a connecting chamber 2203 through a connecting hole 2202. A plug-in tube 25 slidably connected to the storage barrel 22 is nested in the connecting chamber 2203, and the plug-in tube 25 is connected to the lower end of the storage barrel 22 through a connecting spring 26; a blocking block 23 is nested in the connecting hole 2202, and the blocking block 23 is fixedly connected to an iron core rod 24 extending into and connected to the plug-in tube 25, and an electromagnetic coil 27 cooperating with the iron core rod 24 is provided in the shell wall of the storage barrel 22.

[0049] For details, please refer to Fig.11 When the array microphone 20 detects that a certain chamber 301 has a leak, the pigment spraying mechanism in the gas injection chamber 201 corresponding to the chamber 301 is started. More specifically, the electromagnetic coil 27 is started, and the electromagnetic coil 27 pulls the iron core rod 24 downward. The iron core rod 24 drives the blocking block 23 to separate from the connecting hole 2202. At the same time, the iron core rod 24 drives the plug-in tube 25 to be inserted into the gas injection tube 5 below. The high-pressure airflow is injected into the connecting chamber 2203 through the plug-in tube 25, and then the airflow is injected into the conical cavity 2201 through the connecting hole 2202. The high-pressure airflow sprays the pigment powder in the conical cavity 2201, and the pigment powder is blown up and diffused into the chamber 301 of the cylinder head 3. Since there is a leaking pore in the chamber 301, the pigment powder is injected into the leaking pore along with the airflow and discharged outward, so that the color powder is scattered on the outside of the leaking pore, thereby achieving the marking of the leaking pore, especially the cylinder head 3 with multiple leaks has a better multiple marking effect.

[0050] See also Figure 7 and Figure 8The conical cavity 2201 is a conical cavity structure with an open upper end and a pointed end facing downward, the connecting hole 2202 is a conical cone-shaped structure, the blocking block 23 is a truncated cone-shaped structure with the upper part adapted to the connecting hole 2202 and symmetrical upper and lower parts, the lower end of the core rod 24 is a pointed structure, the storage barrel 22 is fixedly connected to the inner wall of the injection cavity 201 through the mounting rod 30, and the inner wall of the injection cavity 201 is fixedly connected with an air pressure sensor 31.

[0051] Specifically, it is convenient to seal the connecting hole 2202 and suitable for the airflow to flow from bottom to top to spray the color powder.

[0052] See also Figure 7-10 An impeller 28 is fixedly sleeved on the lower part of the core rod 24, and a sleeve 32 rotatably connected to the impeller 28 is sleeved on the outer side of the impeller 28. The sleeve 32 is fixedly connected to the inner wall of the plug-in tube 25 through connecting rods 33 equidistantly distributed around the circumference; the core rod 24 is located above the blocking block 23 and is fixedly connected to a guide cone 29, which is a conical structure with the tip facing downward, and guide plates 2901 equidistantly distributed around the circumference are fixedly connected to the conical surface of the guide cone 29.

[0053] Specifically, when the airflow is injected into the plug-in tube 25, it drives the impeller 28 to rotate. The impeller 28 drives the guide cone 29 to rotate through the iron core rod 24. The guide plate 2901 on the guide cone 29 makes a circular motion, so that the color powder sprayed by the airflow is also pushed by the centrifugal force of the guide plate 2901, so that the color powder is more evenly distributed in the chamber 301, thereby improving the marking effect of the color powder.

[0054] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An air tightness detection device for air compressor cylinder head, It is characterized in that The operating table (1) comprises an adapter seat (2) for supporting a cylinder head (3) fixedly connected to the operating table (1), a sealing gasket (4) being installed between the adapter seat (2) and the cylinder head (3), a plurality of positioning columns (202) penetrating bolt holes of the cylinder head (3) being fixedly connected to the adapter seat (2), and a blocking mechanism for blocking air pipes (302) on both sides of the cylinder head (3) being provided above the adapter seat (2); The blocking mechanism comprises a pair of blocking screws (8) arranged opposite to each other on both sides of the cylinder cover (3); the outer ends of the blocking screws (8) are sleeved with a prismatic tube (10) horizontally slidably connected thereto; the prismatic tube (10) is embedded with an extrusion spring (1001) abutting against the end of the blocking screw (8); the prismatic tube (10) is rotatably connected to a moving arm (11); the upper ends of the pair of moving arms (11) are connected to a bidirectional screw module; the bidirectional screw module drives the pair of blocking screws (8) to move towards or away from each other through the moving arm (11) and the prismatic tube (10); the bidirectional screw module The upper end of the screw module is fixedly connected to a lifting cylinder (19), and the lifting cylinder (19) is fixedly connected to the operating table (1) via a support frame (21); the prism cylinder (10) is connected to a vertical transmission shaft (16) rotatably connected to the moving arm (11) via a transmission gear set (15); the upper end of the vertical transmission shaft (16) is fixedly connected to a rolling gear (17), and the rolling gear (17) is meshed with a rack plate (18) fixedly connected to the bidirectional screw module; the lower end of the bidirectional screw module is fixedly connected to an array microphone (20) arranged above the cylinder cover (3); The adapter seat (2) is provided with a pair of gas injection chambers (201) respectively connected to a pair of chambers (301) in the cylinder head (3); the gas injection chambers (201) are connected to gas injection pipes (5); each gas injection pipe (5) is respectively connected to a high-pressure gas pump (7) via a solenoid valve (6); a pigment spraying mechanism arranged opposite to the gas injection pipes (5) is installed in the gas injection chamber (201); the pigment spraying mechanism comprises a material storage barrel (22); a conical chamber (2201) for storing pigment powder is provided at the upper portion of the material storage barrel (22); a conical chamber (2201) for storing pigment powder is provided at the lower end of the conical chamber (2201) The communicating hole (2202) is connected to a communicating cavity (2203), a plug-in tube (25) slidably connected to the material storage barrel (22) is nested in the communicating cavity (2203), and the plug-in tube (25) is connected to the lower end of the material storage barrel (22) via a connecting spring (26); a blocking block (23) is nested in the communicating hole (2202), and the blocking block (23) is fixedly connected to an iron core rod (24) extending into the plug-in tube (25) and connected to the plug-in tube (25), and an electromagnetic coil (27) cooperating with the iron core rod (24) is provided in the shell wall of the material storage barrel (22); An impeller (28) is fixedly sleeved at the lower part of the core rod (24), a sleeve (32) rotatably connected to the impeller (28) is sleeved on the outer side of the impeller (28), and the sleeve (32) is fixedly connected to the inner wall of the plug tube (25) via connecting rods (33) equidistantly distributed around the circumference; the core rod (24) is fixedly connected to a guide cone (29) located above the blocking block (23), the guide cone (29) being a conical structure with the tip facing downward, and guide plates (2901) equidistantly distributed around the circumference are fixedly connected to the conical surface of the guide cone (29).

2. The air tightness detection device for the cylinder head of an air compressor according to claim 1, It is characterized in that The bidirectional screw module comprises a sliding frame (12) sleeved on the upper part of the moving arm (11) and slidably connected thereto, a bidirectional screw (13) threadedly connected to a pair of moving arms (11) is nested in the sliding frame (12), and the bidirectional screw (13) extends to the end of the sliding frame (12) and is connected to a screw motor (14).

3. The air tightness detection device for an air compressor cylinder head according to claim 2, It is characterized in that The rack plate (18) is fixedly connected to the sliding frame (12); the rack plate (18) passes through the movable arm (11) and is slidably connected to the movable arm (11); and the vertical transmission shaft (16) is arranged parallel to the movable arm (11) and is rotatably connected to the inside of the movable arm (11).

4. The air tightness detection device for an air compressor cylinder head according to claim 1, It is characterized in that The inner end of the plugging screw (8) is in the shape of a horizontal truncated cone and the outer end is provided with a prism block (802). A prism cavity for the prism block (802) to slide horizontally is provided in the prism cylinder (10), and the extrusion spring (1001) is nested in the prism cavity.

5. The air tightness detection device for an air compressor cylinder head according to claim 1, It is characterized in that The plugging screw (8) is provided with an abutment ring (801) in the middle, and a sealing airbag (9) is bonded to the inner side of the abutment ring (801), wherein the sealing airbag (9) is an annular airbag.

6. The air tightness detection device for an air compressor cylinder head according to claim 1, It is characterized in that The conical cavity (2201) is a conical cavity structure with an open upper end and a tip facing downwards, the connecting hole (2202) is a conical table-like structure, the blocking block (23) is a truncated table-like structure with an upper portion adapted to the connecting hole (2202) and symmetrical upper and lower portions, the lower end of the core rod (24) is a pointed structure, the storage barrel (22) is fixedly connected to the inner wall of the gas injection cavity (201) via a mounting rod (30), and a pressure sensor (31) is fixedly connected to the inner wall of the gas injection cavity (201).

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