Air tightness detection device

Abstract

The utility model discloses an air tightness detection device, and belongs to the technical field of detection devices. The air tightness detection device is used for detecting the air tightness of the main piston rod, and the main piston rod is provided with an oil cavity, an oil inlet and an oil outlet, the air tightness detection device comprises a mounting seat, a sealing piece, an air injection piece, a connecting pipe, an air pressure meter and a control valve. The mounting base is used for fixing the main piston rod. The sealing piece is used for sealing an oil outlet of the main piston rod. The gas injection part is provided with a gas inlet and a gas outlet which are communicated, the gas injection part is movably connected to the mounting seat, so that the gas injection part can move relative to the mounting seat, the main piston rod is fixed on the mounting seat during detection, and the gas injection part can move on the mounting seat to be communicated with an oil inlet of the active lubrication valve in a sealed manner; the connecting pipe is used for communicating a gas outlet of the air compressor with a gas inlet of the gas injection piece, the barometer and the control valve are both installed on the connecting pipe, and the barometer is located between the control valve and the gas injection piece. The air tightness detection device is helpful for improving the detection efficiency and accuracy.

Description

Technical Field

[0001] The present application belongs to the technical field of detection devices, and in particular, relates to an airtightness detection device. Background Art

[0002] The active lubrication 120 valve is an important component in the railway freight car brake system, and the main piston rod is a key component of the active lubrication 120 valve. Compared with the traditional 120 valve, the active lubrication 120 valve has an additional oil chamber and an oil inlet and an oil outlet connected to the oil chamber in the main piston rod. During the operation of the brake valve, the lubricating oil enters the oil chamber through the oil inlet and is then discharged through the oil outlet to continuously supply oil to the sliding surface of the control valve and the slide valve, reducing damage to the working surface and improving the stability of the cooperation between the slide valve and the control valve.

[0003] like Figure 1 As shown, the main piston rod of the active lubrication 120 valve is an irregular fitting, and the main piston rod has an oil cavity and an oil inlet and an oil outlet connected to the oil cavity. The oil inlet is set on the step arc surface of the main piston rod, and the oil outlet is set in the spring seat cavity of the control valve. In order to process the oil cavity in the main piston rod, it is necessary to set processing ports on the circumferential surface and axial end surface of the main piston rod. After the processing is completed, these processing ports are sealed by tin soldering. The sealing of the tin soldering plug is very important, otherwise the lubricating oil will leak from the tin soldering plug, causing serious damage to the working surface.

[0004] In the related art, in order to verify the sealing performance of the solder plugging, it is necessary to conduct an airtightness test on the main piston rod. In the related art, two plugs are usually used to respectively plug the oil inlet and the oil outlet, and then the plugged main piston rod is immersed in water to observe whether there are bubbles coming out of the solder plugging. If there are bubbles, there is a gap in the solder plugging, so as to detect the airtightness of the main piston rod. This detection method not only has low detection efficiency but also inaccurate detection results. Utility Model Content

[0005] The present application aims to at least to some extent solve the technical problems of low efficiency and inaccurate detection results of air tightness of main piston rod in the related art. To this end, the present application provides an air tightness detection device.

[0006] An air tightness detection device provided in an embodiment of the present application is used to detect the air tightness of a main piston rod, wherein the main piston rod has an oil chamber and an oil inlet and an oil outlet connected to the oil chamber; the air tightness detection device comprises:

[0007] A mounting seat, used for fixing the main piston rod;

[0008] A sealing member, used for sealing the oil outlet of the main piston rod;

[0009] A gas injection piece and a connecting pipe, wherein the gas injection piece has a connected gas inlet and gas outlet, and the gas injection piece is movably connected to the mounting seat so that the gas outlet can be tightly connected with the oil inlet of the main piston rod, and the connecting pipe is used to connect the gas outlet of the air compressor and the gas inlet of the gas injection piece;

[0010] A pressure gauge and a control valve, wherein the pressure gauge and the control valve are both installed on the connecting pipe, and the pressure gauge is located between the control valve and the gas injection member.

[0011] In some embodiments, the gas injection part has a force-applying part, a connecting part and a sealing part, the air inlet is arranged at the force-applying part, the air outlet is arranged at the connecting part, the force-applying part and the sealing part are both installed on the connecting part, and the sealing part is used to seal the air outlet and the oil inlet, and the connecting part is movably connected to the mounting seat.

[0012] In some embodiments, the connecting portion is threadedly connected to the mounting seat.

[0013] In some embodiments, the sealing portion is annular, is sleeved on a side of the connecting portion where the air outlet is arranged, and is fixedly connected to the connecting portion, and the air outlet is located on the inner side of the sealing portion.

[0014] In some embodiments, a conical abutting surface is provided on a side of the sealing portion away from the force applying portion.

[0015] In some embodiments, the airtightness detection device also includes an air compressor.

[0016] In some embodiments, the mounting base includes a base plate, a side plate, a first connecting plate, a second connecting plate and a clamping piece, the base plate is arranged at an angle to the side plate and is fixedly connected; the second connecting plate is fixedly connected to the side plate, the clamping piece is threadedly connected to the second connecting plate so that the clamping piece can move toward the base plate, the first connecting plate is fixedly connected to the base plate, and the gas injection piece is movably connected to the first connecting plate.

[0017] In some embodiments, the seal is fixedly connected to the base plate.

[0018] In some embodiments, the sealing member has a blocking portion and a limiting portion, the blocking portion extends into the oil inlet to seal the oil inlet, and the limiting portion is located outside the oil inlet.

[0019] In some embodiments, the circumferential sleeve of the sealing portion is provided with a sealing rubber ring.

[0020] The utility model has at least the following beneficial effects:

[0021] The present application provides an air tightness detection device for detecting the air tightness of a main piston rod, wherein the main piston rod has an oil chamber and an oil inlet and an oil outlet connected to the oil chamber. The air tightness detection device includes a mounting seat, a seal, an air injection member, a connecting pipe, a pressure gauge and a control valve. The mounting seat is used to fix the main piston rod, and the seal is used to seal the oil outlet of the main piston rod. The air injection member has a connected air inlet and an air outlet, and the air injection member is movably connected to the mounting seat so that the air injection member can move relative to the mounting seat. During detection, the main piston rod is fixed on the mounting seat, and the air injection member can move on the mounting seat to be tightly connected to the oil inlet of the active lubrication valve; the connecting pipe is used to connect the gas outlet of the air compressor and the air inlet of the air injection member, and the pressure gauge and the control valve are both installed on the connecting pipe, and the pressure gauge is located between the control valve and the air injection member. After such design, the sealing member seals the oil outlet of the main piston rod, and the gas injection member seals the oil inlet of the active lubrication valve. During the inspection, the air compressor is used to inject gas with a certain pressure into the oil chamber of the main piston rod, and then the control valve is closed. The user observes the change of the pressure value on the barometer to detect the air tightness of the main piston rod. When performing the air tightness test, the present application can judge the air tightness of the main piston rod by observing the change of the pressure value on the barometer, and the active lubrication valve does not need to be put into water, which helps to improve the detection efficiency and detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic structural diagram of the main piston rod of the present application is shown.

[0024] Figure 2 A schematic diagram of the structure of an airtightness detection device in one or more embodiments of the present application is shown.

[0025] Figure 3 A schematic structural diagram of the connection between the gas injection member and the second connecting plate of the mounting seat in one or more embodiments of the present application is shown.

[0026] Figure 4 A schematic diagram of the structure of a sealing member in one or more embodiments of the present application is shown.

[0027] Figure 5 A schematic diagram of the structure in which the main piston rod is fixed on the air tightness detection device in one or more embodiments of the present application is shown.

[0028] Figure markings: 100-air tightness detection device, 110-mounting seat, 111-bottom plate, 112-side plate, 113-first connecting plate, 1131-threaded through hole, 114-second connecting plate, 115-pressing member, 120-sealing member, 121-sealing part, 122-limiting part, 123-sealing rubber ring, 130-gas injection member, 130a-air inlet, 130b-air outlet, 131-force applying part, 132-connecting part, 133-sealing part, 1331-conical abutting surface, 140-connecting pipe, 150-air compressor, 160-pressure gauge, 170-control valve, 200-main piston rod, 200a-oil inlet, 200b-oil outlet. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] The active lubrication 120 valve is an important component in the railway freight car brake system, and the main piston rod is a key component of the active lubrication 120 valve. Compared with the traditional 120 valve, the active lubrication 120 valve has an additional oil chamber and an oil inlet and an oil outlet connected to the oil chamber in the main piston rod. During the operation of the brake valve, the lubricating oil enters the oil chamber through the oil inlet and is then discharged through the oil outlet to continuously supply oil to the sliding surface of the control valve and the slide valve, reducing damage to the working surface and improving the stability of the cooperation between the slide valve and the control valve.

[0034] like Figure 1 As shown, the main piston rod 200 of the active lubrication 120 valve is an irregular fitting, and the main piston rod 200 has an oil chamber 200c and an oil inlet 200a and an oil outlet 200b connected to the oil chamber 200c. The oil inlet 200a is arranged on the arc surface of the step of the main piston rod, and the oil outlet 200b is arranged in the spring seat cavity of the control valve. In order to process the oil chamber 200c in the main piston rod 200, it is necessary to set processing openings on the circumferential surface and the axial end surface of the main piston rod. After the processing is completed, these processing openings are sealed by tin soldering. The sealing of the tin soldering plug is very important, otherwise the lubricating oil will leak from the tin soldering plug, causing serious damage to the working surface.

[0035] In the related art, in order to verify the sealing performance of the soldering plugging, it is necessary to conduct an airtightness test on the main piston rod. In the related art, two plugs are usually used to respectively plug the oil inlet 200a and the oil outlet 200b, and then the plugged main piston rod 200 is completely immersed in water, and then observe whether there are bubbles coming out of the soldering plugging. If there are bubbles, there is a gap in the soldering plugging and the sealing is not good, so as to detect the airtightness of the main piston rod. This detection method not only has low detection efficiency but also inaccurate detection results.

[0036] This detection method requires the main piston rod to be immersed in water. Due to the low water pressure, the rate at which bubbles emerge from the soldering plug is low, making it difficult for inspectors to observe, resulting in low detection efficiency. In addition, if the gap at the soldering plug is small and the water pressure is also low, it is difficult for water to enter the main piston rod through the gap. Even if there is a gap, no bubbles will be generated, which will cause inspectors to mistakenly believe that the soldering plug is well sealed and there is no gap, resulting in inaccurate detection results.

[0037] In summary, in the related art, the main piston rod 200 has the technical problems of low detection efficiency and inaccurate detection results when performing air tightness detection. The embodiment of the present application provides an air tightness detection device 100, which can at least solve the technical problem of low detection efficiency to a certain extent.

[0038] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0039] The embodiment of the present application provides an air tightness detection device 100 . The air tightness detection device 100 provided in the embodiment of the present application can improve the efficiency of air tightness detection of the main piston rod 200 .

[0040] like Figure 1 As shown, the air tightness detection device 100 of the present application is used to detect the air tightness of the main piston rod 200, and the main piston rod 200 has an oil chamber 200c and an oil inlet 200a and an oil outlet 200b connected to the oil chamber 200c.

[0041] like Figure 2 As shown, the air tightness detection device 100 of the present application includes a mounting seat 110 , a sealing member 120 , an air injection member 130 , a connecting pipe 140 , a pressure gauge 160 and a control valve 170 .

[0042] The mounting seat 110 is used to fix the main piston rod 200. When the main piston rod 200 is tested for air tightness, the main piston rod 200 is fixed on the mounting seat 110. The mounting seat 110 can be fixed to the main piston rod 200 in various ways, such as adhesive fixation, clamping fixation, bolt fixation, etc., which are not limited here.

[0043] The sealing member 120 is used to seal the oil outlet 200 b of the main piston rod 200 to prevent the gas entering from the oil inlet 200 a from being discharged from the oil outlet 200 b .

[0044] The gas injection component 130 has a connected gas inlet 130a and a gas outlet 130b. The gas injection component 130 is movably connected to the mounting seat 110 so that the gas outlet 130b can be tightly connected to the oil inlet 200a of the main piston rod 200. The gas inlet 130a is used to communicate with the gas outlet of the air compressor 150.

[0045] The active connection between the gas injection piece 130 and the mounting seat 110 means that the position of the gas injection piece 130 relative to the mounting seat 110 can be changed, so that the gas injection piece 130 can move toward the main piston rod 200, so that the side of the gas injection piece 130 where the gas outlet 130b is set can be pressed against the main piston rod 200, and then the gas outlet 130b of the gas injection piece 130 can be tightly connected with the oil inlet 200a of the main piston rod 200, thereby preventing gas from being discharged from the gap between the gas injection piece 130 and the mounting seat 110.

[0046] There are various ways in which the gas injection piece 130 and the mounting seat 110 are movably connected. In some embodiments, the gas injection piece 130 and the mounting seat 110 are threadedly connected. After the gas injection piece 130 is rotated, the gas injection piece 130 moves relative to the mounting seat 110, so that the gas injection piece 130 can move in the direction of the main piston rod 200 to compress the main piston rod 200 and make the gas outlet 130b and the oil outlet 200b of the main piston rod 200 tightly connected; in some embodiments, the gas injection piece 130 and the mounting seat 110 are connected by bolts, and an avoidance through hole is opened on the gas injection piece 130, and a plurality of threaded holes are provided on the mounting seat 110. The bolts pass through the avoidance through holes of the gas injection piece 130 and are threadedly connected with the threaded holes to fix the gas injection piece 130 and the mounting seat 110. The position of the gas injection piece 130 relative to the mounting seat 110 can be changed by aligning the avoidance through holes with different threaded holes.

[0047] After such design, the seal 120 seals the oil outlet 200b of the main piston rod 200 to prevent gas from being discharged from the oil outlet 200b, and the gas injection component 130 seals the oil inlet 200a connected to the main piston rod 200 to prevent gas from being discharged from the gap between the gas injection component 130 and the main piston rod 200.

[0048] The connecting pipe 140 is used to connect the gas outlet of the air compressor 150 and the air inlet 130a of the gas injection member 130. During the test, the air inlet 130a of the gas injection member 130 is connected with the gas outlet of the air compressor 150 through the connecting pipe 140. The structure of the air compressor 150 is known to those skilled in the art and will not be described in detail here. The air compressor 150 compresses the air, and the compressed air is discharged from the gas outlet of the air compressor 150. Since the air inlet 130a is connected with the gas outlet of the air compressor 150 through the connecting pipe 140, the gas discharged from the air compressor 150 can enter the oil chamber 200c of the main piston rod 200.

[0049] The pressure gauge 160 and the control valve 170 are both installed on the connecting pipe 140, and the pressure gauge 160 is located between the control valve 170 and the gas injection part 130. Since the connecting pipe 140 and the gas injection part 130 are connected, and the gas injection part 130 is connected to the main piston rod 200, after the pressure gauge 160 is set, the user can observe the pressure of the gas in the main piston rod 200 through the pressure gauge 160. After the control valve 170 is set, when the main piston rod 200 is injected with gas, the control valve 170 is opened so that the gas discharged by the air compressor 150 can be injected into the main piston rod 200; when the main piston rod 200 is injected with gas, the control valve 170 is closed to maintain pressure and prevent gas from leaking from the end of the connecting pipe 140 connected to the air compressor 150; when the main piston rod 200 is tested, the control valve 170 is opened to relieve the pressure of the main piston rod 200.

[0050] With this design, the user injects gas with a certain pressure into the main piston rod 200 through the air compressor 150, and then closes the control valve 170. After that, the user can observe the change of the pressure value on the barometer 160 to judge the air tightness of the main piston rod 200. If the pressure value of the barometer 160 decreases, the gas in the main piston rod 200 has a leakage problem, and the air tightness of the main piston rod 200 is not good. If the pressure value of the barometer 160 remains unchanged, the air tightness of the main piston rod 200 is good. By observing the change of the pressure value on the barometer 160, the air tightness of the main piston rod can be judged without putting the main piston rod 200 into water for testing, which helps to improve the detection efficiency and detection accuracy. In addition, after such a design, when the air tightness detection device 100 performs an air tightness test on the main piston rod 200, an anti-rust leak detection agent can also be applied to the soldering seal of the main piston rod 200, and whether bubbles appear on the leak detection agent is observed to judge the air tightness of the main piston rod 200. If bubbles are generated, there is a gap in the soldering seal and the air tightness of the main piston rod 200 is poor. If no bubbles are generated, the air tightness of the main piston rod 200 is good.

[0051] like Figure 3 As shown, in some embodiments, the gas injection part 130 has a force-applying portion 131, a connecting portion 132 and a sealing portion 133, the air inlet 130a is arranged on the force-applying portion 131, the air outlet 130b is arranged on the connecting portion 132, the force-applying portion 131 and the sealing portion 133 are both installed on the connecting portion 132, and the sealing portion 133 is located next to the air outlet 130b and is used to seal the air outlet 130b and the oil inlet 200a, and the connecting portion 132 is movably connected to the mounting seat 110.

[0052] The air inlet 130a is arranged on the force-applying portion 131, and the air outlet 130b is arranged on the connecting portion 132. The air inlet 130a and the air outlet 130b are connected through the gas passages inside the force-applying portion 131 and the connecting portion 132. When adjusting the position of the gas injection member 130 relative to the mounting seat 110, the user can apply force to the gas injection member 130 through the force-applying portion 131. The arrangement of the force-applying portion 131 facilitates the user to adjust the position of the gas injection member 130 relative to the mounting seat 110, thereby improving the convenience of the air tightness detection device 100 of the present application.

[0053] After such a design, the gas injection component 130 is formed by connecting the force-applying portion 131, the connecting portion 132 and the sealing portion 133. The gas injection component 130 is a split structural design. The force-applying portion 131, the connecting portion 132 and the sealing portion 133 are processed separately and then assembled together, which helps to reduce the difficulty of manufacturing the gas injection component 130. In addition, after such a design, the force-applying portion 131, the connecting portion 132 and the sealing portion 133 can be made of materials that cannot be used according to the functions they play, which helps to ensure the smooth realization of the functions played by each component.

[0054] The structure of the force applying portion 131 is various. In some embodiments, for example Figure 3 As shown, the force applying portion 131 is in the shape of a hexagonal prism, so that the user can hold and twist it easily.

[0055] Specifically, the sealing portion 133 is annular, sleeved on one side of the connecting portion 132 where the air outlet 130b is provided and fixedly connected to the connecting portion 132, and the air outlet 130b is located on the inner side of the sealing portion 133. The sealing portion 133 is annular so that the air outlet 130b can be aligned with and connected to the oil inlet 200a. With this design, the user adjusts the position of the gas injection part 130 through the force-applying portion 131 until the sealing portion 133 is pressed against the main piston rod 200 to seal the gap between the connecting portion 132 and the surface of the main piston rod 200, so that the air outlet 130b is sealed and connected to the oil inlet 200a of the main piston rod 200. Usually, the sealing member 120 is made of elastic materials such as rubber and plastic, so that the sealing member 120 can be compressed and deformed after being subjected to force, and fits tightly with the surface of the main piston rod 200, so as to better seal the gap between the connecting portion 132 and the surface of the main piston rod 200.

[0056] In some embodiments, the connection portion 132 is threadedly connected to the mounting base 110. Figure 3 As shown, the connecting portion 132 is cylindrical as a whole, and an external thread (not shown in the figure) is provided on the circumference of the connecting portion 132 . A threaded through hole 1131 is provided on the mounting seat 110 . The connecting portion 132 is located in the threaded through hole 1131 and is threadedly connected to the threaded through hole 1131 . After such design, the user holds the force-applying part 131 and drives the force-applying part 131 to rotate. Since the connecting part 132 is threadedly connected to the mounting seat 110, the gas injection part 130 can move in a straight line along the axial direction of the connecting part 132 as a whole, so that the gas injection part 130 can move in a direction close to the main piston rod 200, and the sealing part 133 presses the surface of the main piston rod 200 to seal the gap between the connecting part 132 and the surface of the main piston rod 200, so that the air outlet 130b is sealed and connected with the oil inlet 200a of the main piston rod 200, so that the gas injection part 130 can move in a direction away from the main piston rod 200, so that the sealing part 133 does not press the surface of the main piston rod 200, and the main piston rod 200 can be removed from the air tightness detection device 100.

[0057] like Figure 3 As shown, in some embodiments, the force applying portion 131 is fixedly connected to one end of the connecting portion 132 in the length direction, and the air outlet 130 b is disposed at the other end of the connecting portion 132 in the length direction.

[0058] like Figure 3As shown, in some embodiments, a conical abutting surface 1331 is provided on one side of the sealing portion 133 away from the force-applying portion 131. With such a design, the sealing portion 133 can partially extend into the oil inlet 200a of the main piston rod 200, and the conical abutting surface 1331 abuts against the edge of the oil inlet 200a, so that the air outlet 130b is in airtight communication with the oil inlet 200a. Since the diameters of the cross sections of the conical abutting surface 1331 are different at different locations, the design of the conical abutting surface 1331 enables the sealing portion 133 to be applicable to oil inlets 200a of different diameters, thereby improving the scope of application of the air tightness detection device 100 of the present application.

[0059] In some embodiments, the air tightness detection device 100 further includes an air compressor 150. The connecting pipe 140 is connected to the gas outlet of the air compressor 150 and the gas inlet 130a of the gas injection member 130. With this design, the air tightness detection device 100 is equipped with an air compressor 150. The air compressor 150 generates compressed gas when it works, which is transmitted to the main piston rod 200 through the connecting pipe 140 and the gas injection member 130. The design of the air compressor 150 facilitates the use of the air tightness detection device 100 of the present application.

[0060] like Figure 2 As shown, in some embodiments, the mounting base 110 includes a base plate 111, a side plate 112, a first connecting plate 113, a second connecting plate 114 and a clamping piece 115, the base plate 111 and the side plate 112 are arranged at an angle and fixedly connected; the second connecting plate 114 is fixedly connected to the side plate 112, the clamping piece 115 is threadedly connected to the second connecting plate 114 so that the clamping piece 115 can move toward the base plate 111, the first connecting plate 113 is fixedly connected to the base plate 111, and the gas injection piece 130 is movably connected to the first connecting plate 113.

[0061] like Figure 2 As shown, the second connecting plate 114 is horizontally arranged, and the pressing piece 115 is vertically arranged and threadedly connected to the second connecting plate 114. After the pressing piece 115 is rotated, the pressing piece 115 can move toward the bottom plate 111, or move away from the bottom plate 111. With such a design, when using the air tightness detection device 100 of the present application, the main piston rod 200 is first placed on the bottom plate 111, and then the pressing piece 115 is rotated to move the pressing piece 115 toward the main piston rod 200 and press against the main piston rod 200 to fix the main piston rod 200. After the detection of the main piston rod 200 is completed, the pressing piece 115 can be rotated in the opposite direction to move the pressing piece 115 away from the bottom plate 111, so that the pressing piece 115 is separated from the main piston rod 200, so that the main piston rod 200 can be removed from the mounting seat 110. Figure 3As shown, the first connecting plate 113 is vertically arranged, the gas injection piece 130 is horizontally arranged, and the connecting portion 132 of the gas injection piece 130 is threadedly connected to the first connecting plate 113 (a threaded through hole 1131 is provided on the first connecting plate 113). By rotating the gas injection piece 130, the gas injection piece 130 can move toward the main piston rod 200, or move away from the main piston rod 200.

[0062] The bottom plate 111 and the side plate 112 may be arranged at an obtuse angle, an acute angle, or a right angle, which is not limited in the present application. In some embodiments, the bottom plate 111 and the side plate 112 are arranged at a right angle.

[0063] In some embodiments, a rubber pad is disposed at the lower end of the pressing member 115 to prevent the outer surface of the main piston rod 200 from being damaged when the pressing member 115 presses the main piston rod 200 .

[0064] like Figure 4 and Figure 5 As shown, in some embodiments, the sealing member 120 has a blocking portion 121 and a limiting portion 122, the blocking portion 121 extends into the oil inlet 200a to seal the oil inlet 200a, and the limiting portion 122 is located outside the oil inlet.

[0065] The blocking portion 121 extends into the oil inlet 200a to block the oil outlet 200b, and the limiting portion 122 is located outside the oil outlet 200b, which is convenient for the user to pull out the seal 120. It should be noted that the size of the limiting portion 122 is larger than that of the blocking portion 121, and the limiting portion 122 cannot extend into the oil outlet 200b.

[0066] In some embodiments, a sealing rubber ring 123 is disposed around the sealing portion 121. The sealing portion 121 is cylindrical, and a sealing rubber ring 123 is disposed on the outer cover of the sealing portion 121, which helps to enhance the sealing performance of the sealing element 120.

[0067] In some embodiments, the seal 120 is fixedly connected to the bottom plate 111 of the mounting seat 110. The seal 120 and the bottom plate 111 can be fixedly connected in various ways, such as bonding, connection, etc. Specifically, the stopper 122 of the seal 120 is fixedly connected to the bottom plate 111. Of course, the seal 120 and the mounting seat 110 may also be disconnected.

[0068] like Figure 5 As shown, in some implementations, when the main piston rod 200 is fixed on the mounting seat 110, the seal 120 is located between the bottom plate 111 of the mounting seat 110 and the main piston rod 200, and the limiting portion 122 of the seal 120 abuts against the bottom plate 111. After such a design, the bottom plate 111 can provide support for the seal 120 to prevent the air pressure in the main piston rod 200 from being too high, causing the seal 120 to fall out.

[0069] The working principle of the airtightness detection device 100 of the present application is as follows:

[0070] When it is necessary to perform an air tightness test on the main piston rod 200, firstly, the sealing portion 121 of the sealing member 120 is inserted into the oil outlet 200b to seal the oil outlet 200b. Then, the main piston rod 200 is placed on the bottom plate 111. Then, the user rotates the pressing member 115 so that the lower end of the pressing member 115 is pressed against the main piston rod 200 to fix the main piston rod 200. Then, the user rotates the gas injection member 130 to move the gas injection member 130 toward the main piston rod 200 so that the sealing portion 133 of the gas injection member 130 is closely fitted with the main piston rod 200, so that the gas outlet 130b of the gas injection member 130 is close to the main piston rod 200. 0 is sealed and connected to the oil inlet 200a of the main piston rod 200; finally, the air compressor 150 and the control valve 170 are turned on, and the compressed gas with a pressure value of 650kPa-700kPa is injected into the main piston rod 200, and the value of the pressure gauge 160 is observed. When the air pressure reaches a suitable value, the air compressor 150 and the control valve 170 are turned off; then, an anti-rust leak detection agent is applied to the soldering plugging of the main piston rod 200 to observe whether there are bubbles. If no bubbles are generated at the soldering plugging and the value displayed by the pressure gauge 160 remains unchanged within one minute, the air tightness of the main piston rod 200 is good and the air tightness test is qualified. Otherwise, the air tightness test is unqualified. After the air tightness test is completed, turn off the air compressor 150, disconnect the connecting pipe 140 and the air compressor 150, then open the control valve 170 to discharge the gas in the main piston rod 200, then loosen the clamping part 115 and the gas injection part 130 and pull out the sealing part 120 to remove the main piston rod 200 from the air tightness testing device 100.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0072] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0073] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An airtightness detection device, characterized in that: Used to detect the air tightness of a main piston rod (200), the main piston rod (200) having an oil chamber (200c) and an oil inlet (200a) and an oil outlet (200b) communicated with the oil chamber (200c); The airtightness detection device (100) comprises: A mounting seat (110) for fixing the main piston rod (200); A sealing member (120) for sealing an oil outlet (200b) of the main piston rod (200); A gas injection component (130) and a connecting pipe (140), wherein the gas injection component (130) has a connected gas inlet (130a) and a gas outlet (130b), the gas injection component (130) is movably connected to the mounting seat (110) so that the gas outlet (130b) can be tightly connected to the oil inlet (200a) of the main piston rod (200), and the connecting pipe (140) is used to connect the gas outlet of the air compressor (150) and the gas inlet (130a) of the gas injection component (130); A pressure gauge (160) and a control valve (170), wherein the pressure gauge (160) and the control valve (170) are both installed on the connecting pipe (140), and the pressure gauge (160) is located between the control valve (170) and the gas injection component (130).

2. The airtightness detection device according to claim 1, characterized in that: The gas injection component (130) comprises a force-applying portion (131), a connecting portion (132) and a sealing portion (133); the gas inlet (130a) is arranged on the force-applying portion (131); the gas outlet (130b) is arranged on the connecting portion (132); the force-applying portion (131) and the sealing portion (133) are both installed on the connecting portion (132); the sealing portion (133) is used to seal the gas outlet (130b) and the oil inlet (200a); and the connecting portion (132) is movably connected to the mounting seat (110).

3. The airtightness detection device according to claim 2, characterized in that: The connecting portion (132) is threadedly connected to the mounting seat (110).

4. The airtightness detection device according to claim 2, characterized in that: The sealing portion (133) is annular in shape, sleeved on one side of the connecting portion (132) where the air outlet (130b) is provided, and fixedly connected to the connecting portion (132), and the air outlet (130b) is located on the inner side of the sealing portion (133).

5. The airtightness detection device according to claim 4, characterized in that: A conical abutting surface (1331) is provided on a side of the sealing portion (133) away from the force-applying portion (131).

6. The airtightness detection device according to any one of claims 1 to 5, characterized in that: The airtightness detection device (100) further comprises an air compressor (150).

7. The airtightness detection device according to any one of claims 1 to 5, characterized in that: The mounting seat (110) comprises a bottom plate (111), a side plate (112), a first connecting plate (113), a second connecting plate (114) and a clamping piece (115); the bottom plate (111) and the side plate (112) are arranged at an angle and are fixedly connected; the second connecting plate (114) is fixedly connected to the side plate (112); the clamping piece (115) is threadedly connected to the second connecting plate (114) so ​​that the clamping piece (115) can move toward the bottom plate (111); the first connecting plate (113) is fixedly connected to the bottom plate (111); and the gas injection piece (130) is movably connected to the first connecting plate (113).

8. The airtightness detection device according to claim 7, characterized in that: The sealing member (120) is fixedly connected to the bottom plate (111).

9. The airtightness detection device according to any one of claims 1 to 5, characterized in that: The sealing member (120) comprises a blocking portion (121) and a limiting portion (122); the blocking portion (121) extends into the oil inlet (200a) to seal the oil inlet (200a); and the limiting portion (122) is located outside the oil inlet (200a).

10. The airtightness detection device according to claim 9, characterized in that: The sealing portion (121) is sleeved circumferentially with a sealing rubber ring (123).

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