Pressure test device for oil return cylinder

Abstract

The invention discloses a pressure test device for an oil return cylinder, and relates to the technical field of pressure test detection, the pressure test device for the oil return cylinder comprises a device body, and a first plugging mechanism, a second plugging mechanism and a third plugging mechanism which are arranged on the device body, and the device body is provided with a station for placing the oil return cylinder. The first plugging mechanism, the second plugging mechanism and the third plugging mechanism move in the direction close to or away from the station, the first plugging mechanism is used for plugging the oil return pipe or removing plugging, the second plugging mechanism is used for plugging the flange or removing plugging, and the third plugging mechanism is used for plugging the connecting pipe or removing plugging. At least one of the first plugging mechanism, the second plugging mechanism and the third plugging mechanism is connected with a filling assembly used for filling the oil return cylinder with a pressure medium. According to the pressure test device for the oil return cylinder, the labor intensity and experience requirements of workers can be greatly reduced, the efficiency is remarkably improved, and the pressure test device is suitable for batch pressure test detection operation.

Description

Technical Field

[0001] This invention belongs to the field of pressure testing technology, specifically a pressure testing device for oil return cylinders. Background Technology

[0002] In hydraulic systems, the oil inlet and outlet of the oil tank are usually separated by a return oil cylinder to allow sufficient time for air bubbles to separate and impurities to settle in the oil. Existing return oil cylinders have a return oil pipe on their cylinder body, and flanges and connecting pipes at both ends of the cylinder body. All the return oil pipe, flanges, and connecting pipes are connected to the inside of the cylinder body. After welding, a pressure test is required. This involves sealing the return oil pipe, flanges, and connecting pipes, then injecting gas into the return oil cylinder to check for leaks at the welded positions of the return oil pipe, flanges, and connecting pipes. Alternatively, a set pressure can be maintained for a period of time to check if the pressure drop is within acceptable limits.

[0003] In current operations, sealing hoses, plugs, and other components are used to manually seal the return oil pipe, flanges, and connecting pipes one by one before pressurizing and testing. However, this process is cumbersome, time-consuming, labor-intensive, and inefficient, making it unsuitable for batch pressure testing. This problem urgently needs to be solved. Summary of the Invention

[0004] In view of this, the present invention provides a pressure testing device for a return oil cylinder, which replaces the manual sealing operation of each port and can improve the efficiency of pressure testing to at least a certain extent.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a pressure testing device for an oil return cylinder. The oil return cylinder has an oil return pipe on its body, and flanges and connecting pipes are respectively provided at both ends of the oil return cylinder. The pressure testing device for the oil return cylinder includes a device body and a first sealing mechanism, a second sealing mechanism and a third sealing mechanism provided on the device body. The device body has a station for placing the oil return cylinder. The first, second, and third sealing mechanisms all move in the direction of approaching or moving away from the workstation. The first sealing mechanism is used to seal or release the oil return pipe, the second sealing mechanism is used to seal or release the flange, and the third sealing mechanism is used to seal or release the connecting pipe. At least one of the first, second, and third sealing mechanisms is connected to a filling assembly for filling the return oil cylinder with a pressure medium.

[0006] As a further embodiment of the present invention, the workstation is provided with a support groove and a positioning groove, the support groove being used to cooperate with one side of the cylinder for support; The positioning groove is used to cooperate with one side of the return oil pipe for positioning and is located between the first sealing mechanism and the support groove.

[0007] As a further embodiment of the present invention, a fastening assembly is also provided at the workstation. The fastening assembly is used to connect with the return oil cylinder and to press the cylinder body into the support groove and press the return oil pipe into the positioning groove.

[0008] As a further embodiment of the present invention, the fastening assembly includes a connecting sleeve and a retracting assembly, wherein the connecting sleeve is used to connect with the return oil pipe. The retractable assembly connects to the connecting sleeve and is used to drive the connecting sleeve to be tightened in a direction close to the support groove and the positioning groove.

[0009] As a further embodiment of the present invention, the workstation is also provided with an open slot for engaging with a flange so that the second sealing mechanism is pressed against the end face of the flange on the side away from the cylinder body.

[0010] As a further embodiment of the present invention, the positioning groove and the first sealing mechanism move synchronously and adaptively along the direction in which the second sealing mechanism presses or loosens the flange.

[0011] As a further embodiment of the present invention, the second sealing mechanism includes a second sealing component and a second driving component, wherein the second sealing component is used to cooperate with the end face of the flange for sealing. The second drive assembly is fixed on the device body, with the drive end of the second drive assembly facing the open slot side and connected to the second sealing assembly.

[0012] As a further embodiment of the present invention, the filling assembly includes an inflation tube and a pressure air source. The pressure air source is connected to the second sealing assembly through the inflation tube, and a pressure gauge is also provided on the inflation tube.

[0013] As a further embodiment of the present invention, the first sealing mechanism is used to be inserted into the opening of the return oil pipe and expands and contracts radially. And / or, a third sealing mechanism is used to insert into the opening of the connecting pipe and expand and contract radially.

[0014] As a further embodiment of the present invention, the first sealing mechanism includes a first sealing component, a first mounting base and a first driving component. The first sealing component is disposed on the side of the first mounting base facing the workstation, and the first mounting base is connected to the device body through the first driving component. And / or, the third sealing mechanism includes a third sealing component, a third mounting base, and a third drive component. The third sealing component is disposed on the side of the third mounting base facing the work station, and the third mounting base is connected to the device body via the third drive component.

[0015] Compared with the prior art, the beneficial effect of the present invention is that the pressure testing device for the return oil cylinder includes a device body and a first sealing mechanism, a second sealing mechanism and a third sealing mechanism disposed on the device body. The device body has a station for placing the return oil cylinder. The first sealing mechanism, the second sealing mechanism and the third sealing mechanism all move in the direction of approaching or moving away from the station. The first sealing mechanism is used to seal or release the seal on the return oil pipe, the second sealing mechanism is used to seal or release the seal on the flange, and the third sealing mechanism is used to seal or release the seal on the connecting pipe. At least one of the first sealing mechanism, the second sealing mechanism and the third sealing mechanism is connected to a filling component for filling the return oil cylinder with pressure medium.

[0016] Therefore, according to the pressure testing device for the return oil cylinder provided by the present invention, after the return oil cylinder to be tested is placed on the work station, the return oil pipe is sealed by the first sealing mechanism, the flange is sealed by the second sealing mechanism, and the connecting pipe is sealed by the third sealing mechanism. Then, the pressure medium is filled into the return oil cylinder through the filling assembly and the pressure is maintained for a period of time. This allows the detection of whether there is leakage at each connection of the return oil cylinder. It replaces the manual sealing operation of each port, greatly reduces the labor intensity and experience requirements of workers, and significantly improves efficiency. It is suitable for batch pressure testing operations and is simple to operate and convenient to use. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a three-dimensional structural diagram of an existing oil return cylinder; Figure 2 This is a schematic front view of the pressure testing device for the return oil cylinder provided by the present invention; Figure 3 for Figure 2 A schematic diagram of the right-side view structure in the diagram; Figure 4 for Figure 2 A partial cross-sectional view of the structure under pressure testing conditions; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 for Figure 4 Partial sectional view along section BB.

[0019] Figure label: 10. Oil return cylinder; 11. Oil return pipe; 12. Flange; 13. Connecting pipe; 100. Device body; 110. Support groove; 120. Positioning groove; 130. Fastening assembly; 131. Connecting sleeve; 132. Retraction assembly; 140. Opening slot; 200, First sealing mechanism; 210, First sealing assembly; 220, First mounting base; 230, First drive assembly; 300, Second sealing mechanism; 301, Filling assembly; 310, Second sealing assembly; 320, Second drive assembly; 400, Third sealing mechanism; 410, Third sealing assembly; 420, Third mounting base; 430, Third drive assembly. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] Currently, such as Figure 1 As shown, the existing oil return cylinder 10 has an oil return pipe 11 on its cylinder body. The oil return pipe 11 is a flat-mouth pipe with its axis perpendicular to the axis of the cylinder body. The two ends of the cylinder body of the oil return cylinder 10 have a flange 12 and a connecting pipe 13, respectively. The flange 12 is coaxial with the cylinder body, and the connecting pipe 13 is an oblique-mouth pipe with its axis perpendicular to the axis of the cylinder body. Moreover, the oil return pipe 11, the flange 12 and the connecting pipe 13 are all welded to the cylinder body.

[0027] Please see Figure 2-6 As shown, an embodiment of the present invention provides a pressure testing device for a return oil cylinder, including a device body 100 and a first sealing mechanism 200, a second sealing mechanism 300 and a third sealing mechanism 400 disposed on the device body 100. The device body 100 has a station for placing the return oil cylinder 10.

[0028] The first sealing mechanism 200, the second sealing mechanism 300, and the third sealing mechanism 400 all move in the direction of approaching or moving away from the workstation. The first sealing mechanism 200 is used to seal or release the oil return pipe 11, the second sealing mechanism 300 is used to seal or release the flange 12, and the third sealing mechanism 400 is used to seal or release the connecting pipe 13.

[0029] At least one of the first sealing mechanism 200, the second sealing mechanism 300, and the third sealing mechanism 400 is connected to a filling assembly 301 for filling the return oil cylinder 10 with a pressure medium.

[0030] In this embodiment, the device body 100 supports the return oil cylinder 10, the first sealing mechanism 200, the second sealing mechanism 300, and the third sealing mechanism 400, etc. It can be a support frame, a support platform, etc., and can be assembled from profiles and plates. The device body 100 has a workstation for placing the return oil cylinder 10, that is, fixing the cylinder body of the return oil cylinder 10, etc. The workstation can be equipped with a limiting groove, a clamp, etc., to ensure that the return oil cylinder 10 does not move or roll freely when placed on the workstation.

[0031] In this embodiment, the first sealing mechanism 200, the second sealing mechanism 300, and the third sealing mechanism 400 are used to seal the return oil pipe 11, the flange 12, and the connecting pipe 13, respectively. They can be inserted into the pipe opening or port to achieve sealing, or they can be pressed against the pipe opening or port to achieve sealing. All three can be set on the device body 100 by the drive assembly, and all three can move closer to or further away from the work position.

[0032] Among them, at least one of the first sealing mechanism 200, the second sealing mechanism 300 and the third sealing mechanism 400 is connected to a filling component 301, such as an air filling pipe, a liquid filling pipe, etc., that is, the pressure medium filled into the return oil cylinder 10 can be a fluid such as pressurized air or pressurized liquid.

[0033] For example, such as Figure 2 , Figure 4 As shown, the device body 100 has a worktable with workstations. A first sealing mechanism 200 can be positioned above the workstation and moves vertically and horizontally. A second sealing mechanism 300 and a third sealing mechanism 400 are respectively positioned on both sides of the workstation and move horizontally. After the return oil cylinder 10 is placed on the workstation, the first sealing mechanism 200 seals the return oil pipe 11 when it is close to it and releases the seal when it is away from it. The second sealing mechanism 300 seals the flange 12 when it is close to it and releases the seal when it is away from it. The third sealing mechanism 400 seals the connecting pipe 13 when it is close to it and releases the seal when it is away from it. After the first sealing mechanism 200, the second sealing mechanism 300 and the third sealing mechanism 400 are all sealed, the pressure medium is then injected into the return oil cylinder 10 through the filling component 301 and the pressure is maintained for a period of time. This allows the detection of whether there is leakage at each connection point on the return oil cylinder 10, whether the pressure drop is within the acceptable range, and whether the sealing performance is good and the product is qualified.

[0034] It should be noted that the specific arrangement and direction of movement of the first sealing mechanism 200, the second sealing mechanism 300, and the third sealing mechanism 400 are related to the placement of the return oil cylinder 10. For example, the axis of the cylinder can be arranged diagonally, and the return oil pipe 11 can be arranged laterally, depending on the actual placement requirements. Furthermore, since the oil pressure inside the return oil cylinder 10 will not be too high during actual use, the pressure medium injected into the return oil cylinder 10 does not need to be too large and can be determined according to actual needs.

[0035] Therefore, compared to manually sealing each port one by one for pressure testing, the pressure testing device for the return oil cylinder provided by this invention replaces the manual sealing operation of each port, greatly reducing the labor intensity and experience requirements of workers, and significantly improving efficiency. It is suitable for batch pressure testing operations, and is simple to operate and easy to use.

[0036] In some embodiments, the workstation is provided with a support groove 110 and a positioning groove 120, and the support groove 110 is used to cooperate with one side of the cylinder for support.

[0037] The positioning groove 120 is used to cooperate with one side of the return oil pipe 11 for positioning, and is located between the first sealing mechanism 200 and the support groove 110.

[0038] For example, such as Figure 2 , Figure 6 As shown, a support is provided on the workbench. There can be one or more supports, and multiple supports can be arranged at intervals along the horizontal direction. The support has an upward-facing support groove 110. The cross-section of the support groove 110 can be arc-shaped, V-shaped, etc., which cooperates with the lower side of the cylinder body to achieve stable horizontal placement of the cylinder body.

[0039] Furthermore, rolling elements such as rollers and balls can be installed on the inner wall of the support groove 110 to make rolling contact with the cylinder body and reduce surface wear.

[0040] In addition, a positioning frame is provided on the device body 100 above the workbench. The positioning frame has a positioning groove 120 with an opening facing the work station side laterally. The cross-section of the positioning groove 120 can be arc-shaped, V-shaped, etc. It cooperates with part of the side of the return oil pipe 11 to achieve positioning of the return oil pipe 11, restrict the rotation and movement of the return oil cylinder 10, and facilitate the alignment of each sealing mechanism with each port.

[0041] Furthermore, in this embodiment, a fastening assembly 130 is also provided at the workstation. The fastening assembly 130 is used to connect with the return oil cylinder 10, and to press the cylinder body against the support groove 110, and to press the return oil pipe 11 against the positioning groove 120.

[0042] For example, such as Figure 2 , Figure 6 As shown, the fastening assembly 130 is used to fix the return oil cylinder 10. It can be a rope assembly, clamping assembly, etc. The fastening assembly 130 is set on the device body 100 on one side of the workbench. It can be sleeved or hooked with the return oil cylinder 10, and presses the cylinder body against the support groove 110, while pressing the return oil pipe 11 against the positioning groove 120. That is, the fastening assembly 130 pulls or presses the return oil cylinder 10 along the oblique direction close to the support groove 110 and the positioning groove 120. Figure 6 As shown in the first direction, this achieves fastening in two directions simultaneously, making it simpler and more stable.

[0043] Furthermore, in this embodiment, the fastening assembly 130 includes a connecting sleeve 131 and a retracting assembly 132, wherein the connecting sleeve 131 is used to connect with the return oil pipe 11.

[0044] The retractable assembly 132 is connected to the connecting sleeve 131 and is used to drive the connecting sleeve 131 to be tightened in a direction close to the support groove 110 and the positioning groove 120.

[0045] Specifically, such as Figure 2 , Figure 3 , Figure 6As shown, the connecting sleeve 131 can be a rope loop, cable, or ring, etc., used to connect with the return oil pipe 11. The take-up and release assembly 132 can be a telescopic assembly, such as a cylinder, hydraulic cylinder, push-pull rod, or winding drum, etc., whose body is fixed on the device body 100 on one side of the worktable. The drive end of the take-up and release assembly 132 is connected to the connecting sleeve 131 and is tightened along an oblique direction close to the support groove 110 and the positioning groove 120, such as along... Figure 6 As shown in the first direction, the angle between the first direction and the horizontal plane can be 30°~60°.

[0046] This design makes it easier for the operator to place the connecting sleeve 131 onto the return oil pipe 11 and then tighten it via the retraction assembly 132, simplifying the operation and significantly reducing operational difficulty. It is worth noting that during positioning adjustments between the return oil pipe 11 and the positioning groove 120, the connecting sleeve 131 can adaptively adjust with the return oil pipe 11, preventing interference. Furthermore, to avoid damage to the return oil cylinder 10 due to rigid tightening, an elastic buffer (not shown in the figure) can be provided between the connecting sleeve 131 and the retraction assembly 132 to ensure a relatively consistent tightening force.

[0047] Furthermore, in this embodiment, the workstation is also provided with an open slot 140, which is used to engage with the flange 12 so that the second sealing mechanism 300 is pressed against the end face of the flange 12 on the side away from the cylinder body.

[0048] Specifically, such as Figure 2 , Figure 6 As shown, a support base can also be set on the side of the workbench near the flange 12. The support base has an open slot 140 with its opening facing upward. The open slot 140 can be U-shaped, arc-shaped, etc., and is used to engage with the flange 12. The second sealing mechanism 300 can be installed on the support base. The open slot 140 is located between the second sealing mechanism 300 and the work station. When the second sealing mechanism 300 is pressed against the end face of the flange 12, the open slot 140 restricts the flange 12 from moving to the side of the third sealing mechanism 400.

[0049] This method, by pressing and sealing the end face of flange 12, better reflects whether leakage exists under actual use. The larger gap between the open groove 140 and the welded position of flange 12 facilitates leakage observation. It is worth noting that the operator only needs to place the return oil cylinder 10 in the support groove 110, insert flange 12 into the open groove 140, insert return oil pipe 11 into the positioning groove 120, and finally tighten the return oil cylinder 10 to achieve accurate and stable fixation from all directions, facilitating accurate sealing of each port by the various sealing mechanisms.

[0050] Furthermore, in this embodiment, the positioning groove 120 and the first sealing mechanism 200 move synchronously and adaptively along the direction in which the second sealing mechanism 300 presses or loosens the flange 12.

[0051] For example, such as Figures 4 to 6 As shown, the positioning groove 120 and the first sealing mechanism 200 can be set on the slide. The slide is installed on the device body 100 on the workbench through guide rails, guide rods and other guide components. That is, the slide can move back and forth in the direction from left to right, that is, it can move in the parallel direction of the line connecting the second sealing mechanism 300 and the third sealing mechanism 400.

[0052] On the one hand, there is a certain tolerance in the axial distance between the return oil pipe 11 and the flange 12 on different return oil cylinders 10; on the other hand, when the second sealing mechanism 300 presses the flange 12, it generates a certain deformation, causing the return oil pipe 11 to tend to move to the right along with the cylinder body. In this way, the positioning groove 120 and the first sealing mechanism 200 move to the right adaptively in sync with the return oil pipe 11, thereby avoiding interference that could affect the sealing performance of each port or cause damage. Moreover, it greatly reduces the difficulty of operation. The operator only needs to roughly place the return oil cylinder 10 in place, and the tightening of the connecting sleeve 131 and the pressing process of the second sealing mechanism 300 can be adaptively adjusted.

[0053] Furthermore, in this embodiment, the second sealing mechanism 300 includes a second sealing component 310 and a second driving component 320. The second sealing component 310 is used to cooperate with the end face of the flange 12 for sealing.

[0054] The second drive assembly 320 is fixed on the device body 100, with the drive end of the second drive assembly 320 facing the opening slot 140 and connected to the second sealing assembly 310.

[0055] For example, such as Figures 4 to 6 As shown, the second sealing assembly 310 may include an end plate and a sealing ring connected to the end plate facing the workstation. The end plate is used to abut against the end face of the flange 12, and the sealing ring is used to seal against the groove on the end face of the flange 12. The second driving assembly 320 may be a cylinder, hydraulic cylinder, or other components. It may also be fixed on a support base on the worktable, with its driving end facing the workstation and fixed to the end plate, thereby achieving a stable seal on the end face of the flange 12. In addition, a guide assembly may be provided between the end plate and the support base.

[0056] In some embodiments, the filling assembly 301 includes an inflation tube and a pressure air source. The pressure air source is connected to the second sealing assembly 310 through the inflation tube, and a pressure gauge is also provided on the inflation tube.

[0057] Specifically, such as Figure 2 , Figure 4 , Figure 5 , Figure 6 As shown, a connector can be installed on the end plate. The connector is connected to one end of the inflation tube, and the other end of the inflation tube is connected to a pressure air source, such as an air pump or air compressor, to facilitate inflation.

[0058] In addition, a barometer can be installed on the inflation tube for real-time monitoring of inflation and holding pressure, making it more intuitive and convenient. Of course, control valves, controllers, etc., can also be installed, depending on actual needs; this embodiment does not impose specific limitations.

[0059] In some embodiments, the first sealing mechanism 200 is used to insert into the opening of the return oil pipe 11 and expand and contract radially.

[0060] And / or, the third sealing mechanism 400 is used to insert into the opening of the connecting pipe 13 and expand and contract radially.

[0061] For example, such as Figure 4 , Figure 5 As shown, the specific structures of the first sealing mechanism 200 and the third sealing mechanism 400 can be referred to the rapid sealing device for pressure testing disclosed in the detailed embodiment of Chinese Patent No. CN222963558U. The insertion end of the first sealing mechanism 200 and the third sealing mechanism 400 has a radially expanding and contracting elastic sealing sleeve. When the elastic sealing sleeve expands radially, it can abut against the inner wall of the oil return pipe 11 or the connecting pipe 13 and seal it. When the elastic sealing sleeve contracts radially, it can release the seal.

[0062] Of course, the first sealing mechanism 200 or the third sealing mechanism 400 can also be replaced by other types of sealing mechanisms, such as a rubber sleeve clamping port mechanism. The specific type and specifications of the first sealing mechanism 200 and the third sealing mechanism 400 can be determined according to the actual sealing requirements of the pipe opening. This embodiment does not impose too many restrictions.

[0063] Furthermore, in this embodiment, the first blocking mechanism 200 includes a first blocking component 210, a first mounting base 220 and a first driving component 230. The first blocking component 210 is disposed on the side of the first mounting base 220 facing the workstation, and the first mounting base 220 is connected to the device body 100 through the first driving component 230.

[0064] And / or, the third sealing mechanism 400 includes a third sealing component 410, a third mounting base 420 and a third drive component 430. The third sealing component 410 is disposed on the side of the third mounting base 420 facing the work station, and the third mounting base 420 is connected to the device body 100 through the third drive component 430.

[0065] Specifically, such as Figure 2 , Figure 3As shown, the first mounting base 220 can be vertically moved and mounted on the slide, that is, the first mounting base 220 and the slide are slidably connected by a vertical guide rail. The first sealing component 210 can be installed on the side of the first mounting base 220 facing the workstation by means of screwing, snap-fit, etc. The first driving component 230 can be a telescopic component, such as a cylinder or hydraulic cylinder, which is mounted on the slide and the telescopic end is connected to the first mounting base 220, so as to facilitate the first sealing component 210 to move stably vertically by driving it through the first mounting base 220.

[0066] Similarly, for example Figure 2 , Figure 3 As shown, the third mounting base 420 can be moved laterally and is located on the right side of the workbench. That is, the third mounting base 420 and the workbench are slidably connected by a transverse guide rail. The third sealing component 410 can be installed on the side of the third mounting base 420 facing the workstation by means of screwing, snap-fit, etc. The third drive component 430 can also be a telescopic component, such as a cylinder or hydraulic cylinder, which is installed on the slide and the telescopic end is connected to the third mounting base 420, so as to facilitate the third sealing component 410 to move stably laterally by driving it through the third mounting base 420.

[0067] Of course, other components required for pressure testing, such as tool trays and controllers, can also be installed on the device body 100, depending on actual needs. This embodiment does not impose too many restrictions on this.

[0068] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A pressure testing device for a return oil cylinder (10), wherein the return oil cylinder (10) has a return oil pipe (11) on its body, and both ends of the return oil cylinder (10) have flanges (12) and connecting pipes (13), characterized in that, The pressure testing device for the return oil cylinder includes a device body (100) and a first sealing mechanism (200), a second sealing mechanism (300) and a third sealing mechanism (400) disposed on the device body (100). The device body (100) has a station for placing the return oil cylinder (10). The first sealing mechanism (200), the second sealing mechanism (300) and the third sealing mechanism (400) all move in a direction close to or away from the workstation. The first sealing mechanism (200) is used to seal the return oil pipe (11) or release the seal. The second sealing mechanism (300) is used to seal the flange (12) or release the seal. The third sealing mechanism (400) is used to seal the connecting pipe (13) or release the seal. At least one of the first sealing mechanism (200), the second sealing mechanism (300) and the third sealing mechanism (400) is connected to a filling assembly (301) for filling the return oil cylinder (10) with a pressure medium.

2. The pressure testing device for the return oil cylinder according to claim 1, characterized in that, The workstation is provided with a support groove (110) and a positioning groove (120). The support groove (110) is used to cooperate with one side of the cylinder body for support. The positioning groove (120) is used to cooperate with one side of the return oil pipe (11) for positioning, and is located between the first sealing mechanism (200) and the support groove (110).

3. The pressure testing device for the return oil cylinder according to claim 2, characterized in that, The workstation is also provided with a fastening assembly (130), which is used to connect with the return oil cylinder (10), and to press the cylinder body against the support groove (110), and to press the return oil pipe (11) against the positioning groove (120).

4. The pressure testing device for the return oil cylinder according to claim 3, characterized in that, The fastening assembly (130) includes a connecting sleeve (131) and a retracting assembly (132), wherein the connecting sleeve (131) is used to connect with the return oil pipe (11); The retractable assembly (132) is connected to the connecting sleeve (131) and is used to drive the connecting sleeve (131) to be tightened in a direction close to the support groove (110) and the positioning groove (120).

5. The pressure testing device for the return oil cylinder according to claim 4, characterized in that, The workstation is also provided with an open slot (140), which is used to engage with the flange (12) so that the second sealing mechanism (300) is pressed against the end face of the flange (12) on the side away from the cylinder body.

6. The pressure testing device for the return oil cylinder according to claim 5, characterized in that, The positioning groove (120) and the first sealing mechanism (200) move synchronously and adaptively in the direction in which the second sealing mechanism (300) presses or releases the flange (12).

7. The pressure testing device for the return oil cylinder according to claim 5, characterized in that, The second sealing mechanism (300) includes a second sealing assembly (310) and a second drive assembly (320), wherein the second sealing assembly (310) is used to seal by engaging with the end face of the flange (12); The second drive assembly (320) is fixed on the device body (100), and the drive end of the second drive assembly (320) faces the opening slot (140) and is connected to the second sealing assembly (310).

8. The pressure testing device for the return oil cylinder according to claim 7, characterized in that, The filling assembly (301) includes an inflation tube and a pressure gas source. The pressure gas source is connected to the second sealing assembly (310) through the inflation tube. A pressure gauge is also provided on the inflation tube.

9. The pressure testing device for a return oil cylinder according to any one of claims 1 to 8, characterized in that, The first sealing mechanism (200) is used to insert into the opening of the return oil pipe (11) and expand and contract radially; And / or, the third sealing mechanism (400) is used to insert into the opening of the connecting pipe (13) and expand and contract radially.

10. The pressure testing device for the return oil cylinder according to claim 9, characterized in that, The first blocking mechanism (200) includes a first blocking component (210), a first mounting base (220) and a first driving component (230). The first blocking component (210) is disposed on the side of the first mounting base (220) facing the work station. The first mounting base (220) is connected to the device body (100) through the first driving component (230). And / or, the third sealing mechanism (400) includes a third sealing component (410), a third mounting base (420) and a third drive component (430), the third sealing component (410) being disposed on the third mounting base (420) facing the work station, and the third mounting base (420) being connected to the device body (100) via the third drive component (430).

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