Air tightness detection device for oil pump body

Abstract

The utility model relates to an air tightness detection device for an oil pump body, and belongs to the technical field of air tightness detection. Comprising a cabinet body, a water tank is fixedly arranged on a working face in the cabinet body, a water tank is placed on the ground on one side of the cabinet body, an electric hoist is arranged above the water tank, a lifting hook of the electric hoist is connected with a handle of the water tank, and the electric hoist is fixedly arranged at the upper end of the outer side face of the cabinet body; a communicating pipe is arranged between the water tank and the water channel; a fixing frame is arranged above the water tank, a hydraulic cylinder is fixedly arranged on the fixing frame, a piston rod of the hydraulic cylinder vertically and downwards penetrates through the fixing frame, a detection assembly is arranged at the end of the piston rod of the hydraulic cylinder, the detection assembly is located in the water tank, and the air supply assembly is connected with the detection assembly; the problem that unbalanced stress is likely to occur when the pump body is fixed when the air tightness of the pump body is detected at present is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air tightness detection, and in particular relates to an air tightness detection device for an oil pump body. Background Art

[0002] In recent years, in order to improve the product quality and service life of automobile gearboxes, cooling oil pumps have been designed on some gearboxes. This oil pump is designed for 6-speed to 16-speed gearboxes. It is mainly used for cooling hydraulic systems for gearboxes. There are currently no similar products produced in China. After the successful development of this product, it can replace imports and take the lead in the domestic gearbox cooling pump market. This product has long-term strategic significance. The product research and development of cooling oil pumps for gearboxes will fill the gap in the domestic market, and its position in the gearbox oil pump market will have a far-reaching impact on the gearbox market. The quality of the oil pump has become the most important factor in occupying the market. The pump body of the oil pump is made of cast aluminum. How to quickly detect whether the pores and shrinkage holes of cast aluminum exceed the standard has become a key link in measuring the quality of the oil pump, among which the air tightness detection of the cast aluminum pump body is a common method.

[0003] During traditional air tightness testing, the pump body is fixed by multiple pressure columns. Since the pump body is a casting, the contact points between different pressure columns and the pump body are uneven. If all the pressure columns use the same set pressure to press the pump body down, it will cause unbalanced force on the pressure columns and produce local stress concentration, which will crush the pump body. In severe cases, the pump body will be fractured and damaged. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and provides an air tightness detection device for an oil pump body, thereby solving the problem that unbalanced force is easily generated when fixing the pump body when detecting the air tightness of the pump body.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0006] A device for detecting the air tightness of an oil pump body comprises a cabinet, a water trough is fixedly arranged on a working surface inside the cabinet, a water tank is placed on the ground on one side of the cabinet, an electric hoist is arranged above the water tank, a hook of the electric hoist is connected to a handle of the water tank, and the electric hoist is fixedly arranged at the upper end of the outer side surface of the cabinet; a connecting pipe is arranged between the water tank and the water trough; a fixing frame is arranged above the water trough, a hydraulic cylinder is fixedly arranged on the fixing frame, a piston rod of the hydraulic cylinder vertically passes through the fixing frame downward, a detection component is arranged at the end of the piston rod of the hydraulic cylinder, the detection component is located inside the water trough, and an air supply component is connected to the detection component.

[0007] Furthermore, the water tank and the water trough are both box structures with an open upper end.

[0008] Furthermore, one end of the connecting pipe is connected to the inner bottom of the water tank, and the other end of the connecting pipe is connected to the inner bottom of the water tank.

[0009] Furthermore, the fixing frame is a horizontally arranged square plate-shaped structure, and the four corners of the lower end surface of the fixing frame are fixedly connected to the working surface inside the cabinet through a vertical supporting leg respectively.

[0010] Furthermore, the detection assembly includes a support plate, a clamping plate, a mounting plate, a transition head, a support rod, and a guide column; the support plate and the mounting plate are respectively arranged above and below the clamping plate, and the mounting plate is fixedly arranged on the inner bottom surface of the water tank; two vertical guide columns are fixedly arranged on the mounting plate, and the two guide columns are respectively inserted into the two guide holes of the clamping plate; the clamping plate and the support plate are fixedly connected by four vertical support rods; a transition head is fixedly arranged at the center of the support plate, and the end of the piston rod of the hydraulic cylinder is screwed on the transition head.

[0011] Furthermore, a circle of pressure column fixing holes is provided on the pressure plate, and a vertical pressure column is inserted in each pressure column fixing hole, and the pressure column includes a large diameter section in the middle and small diameter sections at both ends, and an external thread is provided on the outer cylindrical surface of the small diameter section at the upper end of the pressure column; the small diameter section at the upper end of the pressure column passes upward through the pressure column fixing hole, and a locking nut is threaded on the passed end; a pressure spring is sleeved on the outer side of the small diameter section at the upper end of the pressure column, and the upper and lower ends of the pressure spring are respectively in contact with the lower end surface of the pressure plate and the upper end surface of the large diameter section of the pressure column.

[0012] Furthermore, a pump body is arranged on the upper end surface of the mounting plate, the lower end opening of the pump body is in contact with the upper end surface of the mounting plate, and a sealing ring is arranged between the lower end opening of the pump body and the upper end surface of the mounting plate; a horizontal cover plate is arranged at the upper end opening of the pump body, an inflation hole which passes through from top to bottom is arranged at the center of the cover plate, and a connecting tube is fixedly arranged at the center of the upper end surface of the cover plate, the connecting tube is a circular cylindrical structure with an opening at the lower end, an inflation chamber is arranged inside the connecting tube, and the inflation chamber is in contact with the inner part of the upper end opening of the pump body through the inflation hole on the cover plate connected; an inflation port is arranged on the side wall of the connecting cylinder, and the inflation port is connected with the inside of the inflation chamber; a vertical fixing rod is fixedly arranged at the center of the upper end surface of the connecting cylinder, and an external thread is arranged on the upper end of the outer cylindrical surface of the fixing rod; a fixing hole for the fixing rod which passes through the fixing hole of the fixing plate upward is arranged at the center of the clamping plate, and a locking nut is screwed on the passed end; a compression spring is sleeved on the outer side of the fixing rod, and the upper and lower ends of the compression spring are respectively in contact with the lower end surface of the clamping plate and the upper end surface of the connecting cylinder.

[0013] Furthermore, a sealing gasket made of silicone material is provided on the lower end surface of the cover plate, and the sealing gasket is tightly crimped between the upper end opening of the pump body and the lower end surface of the cover plate; a plurality of T-blocks are fixedly provided on the upper end surface of the sealing gasket, and a plurality of T-slots are provided on the lower end surface of the cover plate, and the T-blocks on the sealing gasket are clamped in the inside of the T-slots on the lower end surface of the cover plate, so that the sealing gasket fits with the lower end surface of the cover plate; a through hole is provided at the center of the sealing gasket, and the inflation hole on the cover plate is connected with the inside of the upper end opening of the pump body through the through hole on the sealing gasket.

[0014] Furthermore, a screw plug is provided at the side opening of the pump body.

[0015] Furthermore, the air supply assembly includes a three-way valve, a high-pressure pipe, a normal-pressure pipe, and an air supply pipe. The first interface of the three-way valve is connected to one end of the high-pressure pipe, the second interface of the three-way valve is connected to one end of the normal-pressure pipe, the third opening of the three-way valve is connected to one end of the air supply pipe, the other end of the high-pressure pipe is connected to the air compressor, the other end of the normal-pressure pipe is connected to the outside atmosphere, and the other end of the air supply pipe is connected to the inflation port on the connecting tube.

[0016] The beneficial effects of the utility model compared with the prior art are:

[0017] The utility model provides an air tightness detection device for an oil pump body, wherein a spring is arranged between a pressure column and the pump body, and when the pressure column presses the pump body, the force borne by the pump body is the sum of the downward pressure of the hydraulic cylinder and the elastic force of the spring, and the compression amount of the spring can be adjusted by adjusting the locking nut of the pressure column, and then the elastic force of the spring can be adjusted, so that the force at each contact point of the pump body is balanced to avoid local stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 is a front view of the detection component;

[0021] Figure 3 is a top view of the detection component;

[0022] Figure 4 It is a schematic diagram of the connection between the cover plate, the connecting tube and the fixing rod;

[0023] Among them, 1 is a cabinet, 2 is a sink, 3 is a water tank, 4 is an electric hoist, 5 is a connecting pipe, 6 is a fixing frame, 7 is a hydraulic cylinder, 8 is a detection component, 9 is an air supply component, 10 is a support plate, 11 is a clamping plate, 12 is a mounting plate, 13 is a guide column, 14 is a guide sleeve, 15 is a support rod, 16 is a locking nut, 17 is a transition head, 18 is a pressure column, 19 is a compression spring, 20 is a pump body, 21 is a sealing ring, 22 is a cover plate, 23 is a connecting tube, 24 is an inflation chamber, 25 is an inflation port, 26 is a fixing rod, 27 is a sealing gasket, 28 is a screw plug, 29 is a three-way valve, 30 is a high-pressure pipe, 31 is a normal-pressure pipe, and 32 is an air supply pipe. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0025] like Figure 1 As shown in FIG. 4 , the utility model provides an air tightness detection device for an oil pump body, comprising a cabinet 1, a water tank 3, a water tank 2, a fixing frame 6, an electric hoist 4, a hydraulic cylinder 7, a detection component 8, and an air supply component 9.

[0026] The working surface inside the cabinet 1 is arranged horizontally, and a water tank 2 is fixedly arranged on the working surface inside the cabinet 1. The water tank 2 is a square box structure with an open upper end.

[0027] A water tank 3 is placed on the ground on one side of the cabinet 1. The water tank 3 is a box structure with an upper end open, and water is filled in the water tank 3. An electric hoist 4 is arranged above the water tank 3. The hook of the electric hoist 4 is connected to the handle of the water tank 3. The water tank 3 is controlled to be raised and lowered by the electric hoist 4. The electric hoist 4 is fixedly arranged at the upper end of the outer side of the cabinet 1.

[0028] A connecting pipe 5 is provided between the water tank 3 and the water tank 2 , one end of the connecting pipe 5 is connected to the inner bottom of the water tank 3 , and the other end of the connecting pipe 5 is connected to the inner bottom of the water tank 2 .

[0029] A fixing frame 6 is arranged above the water tank 2. The fixing frame 6 is a horizontally arranged square plate-shaped structure. The four corners of the lower end surface of the fixing frame 6 are fixedly connected to the working surface inside the cabinet 1 through a vertical supporting leg. A hydraulic cylinder 7 is fixedly arranged on the fixing frame 6. The cylinder body of the hydraulic cylinder 7 is fixedly arranged at the center of the upper end surface of the fixing frame 6. The piston rod of the hydraulic cylinder 7 passes through the fixing frame 6 vertically downward.

[0030] A detection assembly 8 is provided at the end of the piston rod of the hydraulic cylinder 7 . The detection assembly 8 is located inside the water tank 2 . The detection assembly 8 includes a support plate 10 , a clamping plate 11 , a mounting plate 12 , a transition head 17 , a support rod 15 , a guide column 13 , and a cover plate 22 .

[0031] The support plate 10 , the clamping plate 11 , and the mounting plate 12 are all horizontally arranged square plate structures. The support plate 10 and the mounting plate 12 are respectively arranged above and below the clamping plate 11 , and the mounting plate 12 is fixedly arranged on the inner bottom surface of the water tank 2 .

[0032] Two vertical guide posts 13 are fixedly arranged on the mounting plate 12, two guide holes which pass through the clamping plate 11 from top to bottom are arranged, guide sleeves 14 are fixedly arranged inside the guide holes, the two guide posts 13 are respectively inserted into the guide sleeves 14 of the two guide holes, and the outer cylindrical surface of the guide post 13 is in sliding contact with the inner surface of the guide sleeve 14, so that the clamping plate 11 can slide stably above the support plate 10.

[0033] Four lower fixing holes in a square array are arranged on the clamping plate 11, and an upper fixing hole is arranged at each of the four corners of the support plate 10. The upper fixing holes correspond to the lower fixing holes one by one and have the same inner diameter. A vertical support rod 15 is arranged between the corresponding upper fixing holes and the lower fixing holes, and the support rod 15 includes a large diameter section in the middle and small diameter sections at both ends, and external threads are arranged on the outer cylindrical surfaces of the small diameter sections at both ends; the outer diameter of the large diameter section of the support rod 15 is larger than the inner diameter of the upper fixing hole and the lower fixing hole, and the outer diameter of the small diameter section of the support rod 15 is smaller than the inner diameter of the upper fixing hole and the lower fixing hole. The small diameter sections at both ends of the support rod 15 pass through the interior of the upper fixing hole and the lower fixing hole respectively, and a locking nut 16 is screwed on one end of the passing, and the two ends of the large diameter section of the support rod 15 are in contact with the clamping plate 11 and the support plate 10 respectively, so that the support plate 10 is fixedly connected with the clamping plate 11.

[0034] A central fixing hole is provided at the center of the support plate 10, which passes through from top to bottom. A transition head 17 is inserted inside the central fixing hole. The transition head 17 includes a large diameter section on the upper side and a small diameter section on the lower side. An external thread is provided on the outer cylindrical surface of the small diameter section. The small diameter section of the transition head 17 passes downward through the central fixing hole at the center of the support plate 10, and a locking nut 16 is screwed on one end through the passage. An internal thread hole is provided at the upper end surface of the large diameter section of the transition head 17, and the piston rod end of the hydraulic cylinder 7 is screwed inside the internal thread hole of the upper end surface of the large diameter section of the transition head 17. The support plate 10 and the clamping plate 11 are driven to rise and fall by the extension and retraction of the piston rod of the hydraulic cylinder 7.

[0035] A circle of pressure column fixing holes is provided on the pressure plate 11, and a vertical pressure column 18 is inserted in each pressure column fixing hole. The pressure column 18 includes a large diameter section in the middle and small diameter sections at both ends. An external thread is provided on the outer cylindrical surface of the small diameter section at the upper end of the pressure column 18. The small diameter section at the upper end of the pressure column 18 passes upward through the pressure column fixing hole, and a locking nut 16 is screwed on the passing end. A pressure spring 19 is sleeved on the outer side of the small diameter section at the upper end of the pressure column 18, and the upper and lower ends of the pressure spring 19 are in contact with the lower end surface of the pressure plate 11 and the upper end surface of the large diameter section of the pressure column 18 respectively.

[0036] A pump body 20 is arranged on the upper end surface of the mounting plate 12, the lower end opening of the pump body 20 is in contact with the upper end surface of the mounting plate 12, and a sealing ring 21 is arranged between the lower end opening of the pump body 20 and the upper end surface of the mounting plate 12, and the sealing ring 21 is used to ensure the sealing of the lower end opening of the pump body 20.

[0037] A horizontal cover plate 22 is provided at the upper opening of the pump body 20, and an air-filling hole is provided at the center of the cover plate 22, which is through from top to bottom, and the air-filling hole corresponds to the upper opening of the pump body 20. A connecting tube 23 is fixedly provided at the center of the upper end surface of the cover plate 22, and the connecting tube 23 is a circular cylindrical structure with an opening at the lower end, and an air-filling cavity 24 is provided inside the connecting tube 23, and the air-filling cavity 24 is connected to the inner part of the upper opening of the pump body 20 through the air-filling hole on the cover plate 22. An air-filling port 25 is provided on the side wall of the connecting tube 23, and the air-filling port 25 is connected to the inner part of the air-filling cavity 24. A vertical fixing rod 26 is fixedly provided at the center of the upper end surface of the connecting tube 23, and an external thread is provided at the upper end of the outer cylindrical surface of the fixing rod 26; a fixing rod fixing hole is provided at the center of the clamping plate 11, and the fixing rod 26 passes upward through the fixing rod fixing hole of the clamping plate 11, and a locking nut 16 is screwed on the end through which it passes. A compression spring 19 is sleeved on the outside of the fixing rod 26 , and the upper and lower ends of the compression spring 19 are in contact with the lower end surface of the compression plate 11 and the upper end surface of the connecting tube 23 respectively.

[0038] A sealing gasket 27 made of silicone material is provided on the lower end surface of the cover plate 22, and the sealing gasket 27 is tightly pressed between the upper end opening of the pump body 20 and the lower end surface of the cover plate 22. A plurality of T-shaped blocks are fixedly provided on the upper end surface of the sealing gasket 27, and a plurality of T-shaped slots are provided on the lower end surface of the cover plate 22. The T-shaped blocks on the sealing gasket 27 are clamped inside the T-shaped slots on the lower end surface of the cover plate 22, so that the sealing gasket 27 fits the lower end surface of the cover plate 22. A through hole is provided at the center of the sealing gasket 27, and the inflation hole on the cover plate 22 is connected to the inside of the upper end opening of the pump body 20 through the through hole on the sealing gasket 27.

[0039] A screw plug 28 is disposed at the side opening of the pump body 20 .

[0040] The air supply assembly 9 includes a three-way valve 29, a high-pressure pipe 30, a normal-pressure pipe 31, and an air supply pipe 32. The first interface of the three-way valve 29 is connected to one end of the high-pressure pipe 30, the second interface of the three-way valve 29 is connected to one end of the normal-pressure pipe 31, the third opening of the three-way valve 29 is connected to one end of the air supply pipe 32, the other end of the high-pressure pipe 30 is connected to the air compressor, the other end of the normal-pressure pipe 31 is connected to the outside atmosphere, and the other end of the air supply pipe 32 is connected to the inflation port 25 on the connecting tube 23.

[0041] The working principle of the utility model is:

[0042] Before the detection, the water tank 3 is filled with water and the water tank 3 is in contact with the ground.

[0043] When testing begins, place the pump body 20 on the mounting plate 12 so that the lower opening of the pump body 20 and the upper end surface of the mounting plate 12 are sealed by the sealing ring 21. The piston rod of the operating hydraulic cylinder 7 is extended, and the piston rod drives the support plate 10 and the clamping plate 11 to begin to descend, and the lower ends of a circle of pressure columns 18 begin to contact the surroundings of the upper end surface of the pump body 20, thereby clamping the pump body 20. Since the pump body 20 is a casting, the contact points between the upper end surface of the pump body 20 and different pressure columns 18 are uneven. If all the pressure columns 18 use the same set pressure to press the pump body 20 downward, it will cause the pressure columns 18 to be unbalanced, resulting in local stress concentration, thereby crushing the pump body 20. In severe cases, the pump body 20 will be fractured, causing damage to the pump body 20. Therefore, a spring is arranged between the pressure column 18 and the pump body 20. When the pressure column 18 presses the pump body 20, the force borne by the pump body 20 is the sum of the downward pressure of the hydraulic cylinder 7 and the elastic force of the spring. The compression amount of the spring can be adjusted by adjusting the locking nut 16 of the pressure column 18, and then the elastic force of the spring can be adjusted, so that the force at each contact point of the pump body 20 is balanced to avoid local stress concentration.

[0044] When the pump body 20 is pressed down and fixed by the pressure column 18 , the sealing gasket 27 on the lower end surface of the cover plate 22 is in close contact with the upper end opening of the pump body 20 , and the upper end opening of the pump body 20 is sealed by the sealing gasket 27 .

[0045] Then control the electric hoist 4 to lift the water tank 3 so that the lower end surface of the water tank 3 exceeds the upper end surface of the water tank 2, and the water inside the water tank 3 flows into the water tank 2 through the connecting pipe 5. When the water inside the water tank 2 completely submerges the pump body 20, the electric hoist 4 stops working.

[0046] Then the three-way valve 29 is controlled to connect the high-pressure pipe 30 with the air supply pipe 32, and the compressed air enters the air filling chamber 24 inside the connecting tube 23 through the high-pressure pipe 30 and the air supply pipe 32, and finally enters the pump body 20. At this time, if the pump body 20 has defects such as air holes and sand holes, bubbles will be generated, so as to achieve the purpose of air tightness detection of the pump body 20.

[0047] After 30 seconds, the electric hoist 4 is started again, so that the water tank 3 is lowered to contact the ground, and the water in the water tank 2 flows back into the water tank 3 through the connecting pipe 5. The piston rod of the hydraulic cylinder 7 is retracted, the pressing plate 11 and the supporting plate 10 are raised, and the sealing gasket 27 on the cover plate 22 is separated from the pump body 20. Finally, the pump body 20 is taken out, and a working cycle is completed.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An air tightness detection device for an oil pump body, characterized in that: The invention comprises a cabinet (1), a water tank (2) is fixedly arranged on a working surface inside the cabinet (1), a water tank (3) is placed on the ground on one side of the cabinet (1), an electric hoist (4) is arranged above the water tank (3), a hook of the electric hoist (4) is connected to a handle of the water tank (3), and the electric hoist (4) is fixedly arranged at the upper end of the outer side surface of the cabinet (1); a connecting pipe (5) is arranged between the water tank (3) and the water tank (2); a fixing frame (6) is arranged above the water tank (2), a hydraulic cylinder (7) is fixedly arranged on the fixing frame (6), a piston rod of the hydraulic cylinder (7) vertically passes through the fixing frame (6) downward, and a detection component (8) is arranged at the end of the piston rod of the hydraulic cylinder (7), the detection component (8) is located inside the water tank (2), and an air supply component (9) is connected to the detection component (8).

2. The air tightness detection device for an oil pump body according to claim 1, characterized in that: The water tank (2) and the water box (3) are both box structures with an open top.

3. The air tightness detection device for an oil pump body according to claim 1, characterized in that: One end of the connecting pipe (5) is connected to the inner bottom of the water tank (3), and the other end of the connecting pipe (5) is connected to the inner bottom of the water tank (2).

4. The air tightness detection device for an oil pump body according to claim 1, characterized in that: The fixing frame (6) is a horizontally arranged square plate-shaped structure, and the four corners of the lower end surface of the fixing frame (6) are fixedly connected to the working surface inside the cabinet (1) via a vertical supporting leg respectively.

5. The air tightness detection device for an oil pump body according to claim 1, characterized in that: The detection assembly (8) comprises a support plate (10), a clamping plate (11), a mounting plate (12), a transition head (17), a support rod (15), and a guide column (13); the support plate (10) and the mounting plate (12) are respectively arranged above and below the clamping plate (11), and the mounting plate (12) is fixedly arranged on the inner bottom surface of the water tank (2); two vertical guide columns (13) are fixedly arranged on the mounting plate (12), and the two guide columns (13) are respectively inserted into two guide holes of the clamping plate (11); the clamping plate (11) and the support plate (10) are fixedly connected via four vertical support rods (15); a transition head (17) is fixedly arranged at the center of the support plate (10), and the end of the piston rod of the hydraulic cylinder (7) is screwed onto the transition head (17).

6. The air tightness detection device for an oil pump body according to claim 5, characterized in that: A circle of pressure column fixing holes is provided on the pressure plate (11), and a vertical pressure column (18) is inserted into each pressure column fixing hole, the pressure column (18) comprises a large diameter section in the middle and small diameter sections at both ends, and an external thread is provided on the outer cylindrical surface of the small diameter section at the upper end of the pressure column (18); the small diameter section at the upper end of the pressure column (18) passes upward through the pressure column fixing hole, and a locking nut (16) is screwed on the passing end; a pressure spring (19) is sleeved on the outer side of the small diameter section at the upper end of the pressure column (18), and the upper and lower ends of the pressure spring (19) are respectively in contact with the lower end surface of the pressure plate (11) and the upper end surface of the large diameter section of the pressure column (18).

7. The air tightness detection device for an oil pump body according to claim 6, characterized in that: A pump body (20) is arranged on the upper end surface of the mounting plate (12), the lower end opening of the pump body (20) is in contact with the upper end surface of the mounting plate (12), and a sealing ring (21) is arranged between the lower end opening of the pump body (20) and the upper end surface of the mounting plate (12); a horizontal cover plate (22) is arranged at the upper end opening of the pump body (20), an inflation hole penetrating from top to bottom is arranged at the center of the cover plate (22), and a connecting tube (23) is fixedly arranged at the center of the upper end surface of the cover plate (22), the connecting tube (23) being a circular cylindrical structure with an opening at the lower end, and an inflation chamber (24) is arranged inside the connecting tube (23), and the inflation chamber (24) is connected to the upper end opening of the pump body (20) through the inflation hole on the cover plate (22). The connecting tube (23) and the connecting tube (23) are connected to each other; an inflation port (25) is provided on the side wall of the connecting tube (23), and the inflation port (25) is connected to the inside of the inflation chamber (24); a vertical fixing rod (26) is fixedly provided at the center of the upper end surface of the connecting tube (23), and the upper end of the outer cylindrical surface of the fixing rod (26) is provided with an external thread; a fixing rod fixing hole that passes through the fixing rod fixing hole of the pressing plate (11) is provided at the center of the pressing plate (11), and the fixing rod (26) passes upward through the fixing rod fixing hole of the pressing plate (11), and a locking nut (16) is screwed on the passing end; a pressing spring (19) is sleeved on the outer side of the fixing rod (26), and the upper and lower ends of the pressing spring (19) are respectively in contact with the lower end surface of the pressing plate (11) and the upper end surface of the connecting tube (23).

8. The air tightness detection device for an oil pump body according to claim 7, characterized in that: A sealing gasket (27) made of silicone material is arranged on the lower end surface of the cover plate (22), and the sealing gasket (27) is tightly pressed between the upper end opening of the pump body (20) and the lower end surface of the cover plate (22); a plurality of T-shaped blocks are fixedly arranged on the upper end surface of the sealing gasket (27), and a plurality of T-shaped grooves are arranged on the lower end surface of the cover plate (22); the T-shaped blocks on the sealing gasket (27) are clamped inside the T-shaped grooves on the lower end surface of the cover plate (22), so that the sealing gasket (27) and the lower end surface of the cover plate (22) fit together; a through hole is arranged at the center of the sealing gasket (27), and the inflation hole on the cover plate (22) is connected to the inside of the upper end opening of the pump body (20) through the through hole on the sealing gasket (27).

9. The air tightness detection device for an oil pump body according to claim 7, characterized in that: A screw plug (28) is provided at the side opening of the pump body (20).

10. The air tightness detection device for an oil pump body according to claim 7, characterized in that: The air supply assembly (9) comprises a three-way valve (29), a high-pressure pipe (30), a normal-pressure pipe (31), and an air supply pipe (32); a first interface of the three-way valve (29) is connected to one end of the high-pressure pipe (30), a second interface of the three-way valve (29) is connected to one end of the normal-pressure pipe (31), a third opening of the three-way valve (29) is connected to one end of the air supply pipe (32), the other end of the high-pressure pipe (30) is connected to an air compressor, the other end of the normal-pressure pipe (31) is connected to the outside atmosphere, and the other end of the air supply pipe (32) is connected to the inflation port (25) on the connecting tube (23).

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