Device for testing air tightness of oil cylinder

Abstract

The utility model discloses an oil cylinder air tightness testing device which comprises a bottom plate, a sliding groove is formed in one side of the top of the bottom plate in an inward concave mode, adjusting openings are formed in the two sides of the sliding groove respectively, clamping assemblies are arranged in the adjusting openings in a sliding mode, the clamping assemblies are fixedly connected with the middles of the two ends of a placing plate respectively, and the placing plate is arranged in the sliding groove in a sliding mode. Positioning assemblies are movably arranged at one end of the adjusting opening and movably arranged on the two sides of the bottom plate. The other side of the top of the bottom plate is fixedly connected with one end of a supporting column, the other end of the supporting column is fixedly connected with the bottom of one side of a fixing plate, the other side of the fixing plate is slidably sleeved with a movable rod, one end of the movable rod is hinged to a pressing assembly, the pressing assembly is movably arranged at the top of the fixing plate, and the other end of the movable rod is fixedly connected with a connector. A corresponding oil cylinder mold is placed on the containing plate, the oil cylinder is supported by the mold, the mold is limited and fixed through the clamping assembly, then the oil cylinder position fixity is kept, and the containing plate moves in the sliding groove and is pushed to the end of the sliding groove.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder airtightness testing technology, specifically to a hydraulic cylinder airtightness testing device. Background Technology

[0002] Nowadays, hydraulic cylinders are used in an increasingly wide range of fields, especially in road machinery and construction machinery. With my country's vigorous development of infrastructure projects, the market demand for various road machinery equipment is increasing, and the demand for hydraulic cylinders is also increasing, such as loader cylinders, pile foundation cylinders, excavator cylinders, dump truck lifting cylinders, etc. At the same time, the requirements for cylinders are also becoming more and more stringent, leading to a market where only the best survive.

[0003] The usual testing method involves conducting a pressure holding test on the hydraulic cylinder and observing whether there is a pressure drop within the cylinder for a specified time. If there is no pressure drop, it indicates no internal leakage and good sealing. Different types of hydraulic cylinders have different shapes and sizes, and existing testing devices cannot effectively fix the hydraulic cylinders, reducing the flexibility of the testing device. Therefore, we propose a hydraulic cylinder airtightness testing device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic cylinder airtightness testing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic cylinder airtightness testing device, comprising a base plate, a groove recessed on one side of the top of the base plate, adjustment ports respectively opened on both sides of the groove, a clamping assembly slidably disposed in the adjustment port, the clamping assembly being fixedly connected to the middle of both ends of a placement plate, the placement plate being slidably disposed in the groove, and positioning assemblies movably disposed on both sides of the base plate, one end of the positioning assembly being close to the adjustment port for engaging the clamping assembly;

[0006] One end of a support column is fixedly connected to the top of the base plate on the other side. The other end of the support column is fixedly connected to the bottom of one side of the fixed plate. A movable rod is slidably sleeved on the other side of the fixed plate. One end of the movable rod is hinged to a pressing assembly. The pressing assembly is movably disposed on the top of the fixed plate. The other end of the movable rod is fixedly connected to a joint. The joint is movably disposed on the bottom of the fixed plate.

[0007] Preferably, the positioning assembly includes a positioning plate, a connecting shaft, a bayonet, a guide block, a torsion spring, and a cylindrical groove. The connecting shaft is rotatably connected to the side of the base plate near the support column. The connecting shaft passes through the base plate and is fixedly connected to one end of the positioning plate. The positioning plate is movably disposed on both sides of the base plate, and a bayonet is provided at the other end of the positioning plate. A guide block is fixedly connected to the inner side of the bayonet of the positioning plate. A torsion spring is sleeved on the end of the connecting shaft and is disposed in the cylindrical grooves provided on both sides of the base plate. One end of the torsion spring is fixedly connected to the positioning plate, and the other end of the torsion spring is fixedly connected to the cylindrical grooves on both sides of the base plate.

[0008] Preferably, the clamping assembly includes a movable block, a movable cavity, a positioning rod, an operating block, a spring, and a limiting ring. The movable block is slidably disposed within the adjustment port. One end of the movable block is fixedly connected to the outer wall of the placement plate, and the other end of the movable block is slidably sleeved with the positioning rod. One end of the positioning rod is fixedly connected to the operating block, which is movably disposed outside the movable block. The other side of the positioning rod is fixedly sleeved with the limiting ring, which is slidably disposed within the movable cavity. The movable cavity is hollow within the movable block. One end of the spring is fixedly connected to one side of the limiting ring, and the other end of the spring is fixedly connected to the inner wall of the movable cavity.

[0009] Preferably, the movable block has a cylindrical structure, and the end of the positioning rod away from the operating block slides out of the placement plate, with an anti-slip block fixedly connected to the end of the positioning rod.

[0010] Preferably, the adjustment port has a racetrack-shaped structure.

[0011] Preferably, the pressing assembly includes an operating handle, a transmission rod, a support connecting rod, and a base. The base is fixedly connected to the top of the fixed plate, and the base is slidably sleeved with the movable rod. One end of the support connecting rod is hinged to each end of the base, and the other end of the support connecting rod is hinged to the corner of the transmission rod. One end of the transmission rod is hinged to one end of the movable rod, and the other end of the transmission rod is fixedly connected to the operating handle.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: By placing the corresponding hydraulic cylinder mold on the placement plate, the mold supports the hydraulic cylinder and is fixed by the clamping component, thereby maintaining the fixed position of the hydraulic cylinder. The placement plate moves in the slide groove. After the placement plate is pushed to the end of the slide groove, the pressing component is manually operated. The pressing component drives the connector to connect with the hydraulic cylinder interface. Finally, the hydraulic cylinder is tested for air tightness with an air tightness tester, which increases the flexibility during testing. The positioning component positions and limits the placement plate, so that the test hydraulic cylinder is fixed after reaching the designated position, ensuring the stability of the hydraulic cylinder during testing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the clamping component of this utility model.

[0015] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0016] Figure 4 This is a cross-sectional view of the positioning component in this utility model.

[0017] In the diagram: 1. Base plate; 2. Slide groove; 3. Adjustment port; 4. Clamping assembly; 41. Movable block; 42. Movable cavity; 43. Positioning rod; 44. Operating block; 45. Spring; 46. Limiting ring; 47. Anti-slip block; 5. Placement plate; 6. Support column; 7. Fixing plate; 8. Pressing assembly; 81. Operating handle; 82. Transmission rod; 83. Support connecting rod; 84. Base; 9. Movable rod; 10. Connector; 11. Positioning assembly; 111. Positioning plate; 112. Connecting shaft; 113. Bayonet; 114. Guide block; 115. Torsion spring; 116. Cylindrical groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1

[0020] Reference Figure 1 , 2 This is the first embodiment of the present invention. This embodiment provides a hydraulic cylinder airtightness testing device, including a base plate 1. A groove 2 is recessed on one side of the top of the base plate 1. Adjustment ports 3 are respectively opened on both sides of the groove 2. A clamping component 4 is slidably arranged in the adjustment port 3. The clamping component 4 is fixedly connected to the middle of both ends of the placement plate 5. The placement plate 5 is slidably arranged in the groove 2. Positioning components 11 are movably arranged on both sides of the base plate 1. One end of the positioning component 11 is close to the adjustment port 3 and is used to engage the clamping component 4.

[0021] One end of the support column 6 is fixedly connected to the top of the base plate 1. The other end of the support column 6 is fixedly connected to the bottom of one side of the fixed plate 7. The other side of the fixed plate 7 is slidably connected to the movable rod 9. One end of the movable rod 9 is hinged to the pressing component 8. The pressing component 8 is movably located on the top of the fixed plate 7. The other end of the movable rod 9 is fixedly connected to the connector 10. The connector 10 is movably located on the bottom of the fixed plate 7.

[0022] The placement plate 5 has a recessed groove at its top for inserting a mold supporting the hydraulic cylinder. The bottom of the mold is rectangular and matches the shape of the placement groove. The top of the mold has a mounting bracket that matches the shape of different cylinder models for fixing the cylinder. The cylinder to be tested is placed in the mounting bracket of the mold, with the test interface located at the top. After the mold is placed into the placement plate 5, the clamping assembly 4 clamps and fixes the mold, ensuring its stability. Then, the mold is pushed, causing the placement plate 5 to move within the slide groove 2 until it reaches the end of the slide groove 2. After the positioning component 11 engages with the clamping component 4, the placement plate 5 is in place. If the positioning component 11 does not engage with the clamping component 4, the placement plate 5 is not in place, and the placement plate 5 needs to be moved further. After the placement plate 5 is in place, the hydraulic cylinder test interface is located directly below the connector 10. Then, the pressing component 8 is manually operated. The pressing component 8 drives the movable rod 9 to move down, and the movable rod 9 drives the connector 10 to move down. The connector 10 is inserted into the hydraulic cylinder test interface. The connector 10 is connected to the airtightness tester through the pipeline. The airtightness tester tests the airtightness of the hydraulic cylinder.

[0023] Example 2

[0024] Reference Figure 1-4 This is the second embodiment of the present invention, which is based on the previous embodiment. Specifically, the clamping assembly 4 includes a movable block 41, a movable cavity 42, a positioning rod 43, an operating block 44, a spring 45, and a limiting ring 46. The movable block 41 is slidably disposed in the adjustment port 3. One end of the movable block 41 is fixedly connected to the outer wall of the placement plate 5, and the other end of the movable block 41 is slidably sleeved with the positioning rod 43. One end of the positioning rod 43 is fixedly connected to the operating block 44, and the operating block 44 is movably disposed outside the movable block 41. The other side of the positioning rod 43 is fixedly sleeved with the limiting ring 46, and the limiting ring 46 is slidably disposed in the movable cavity 42. The movable cavity 42 is hollow and disposed inside the movable block 41. One side of the limiting ring 46 is fixedly connected to one end of the spring 45, and the other end of the spring 45 is fixedly connected to the inner wall of the movable cavity 42.

[0025] Furthermore, the movable block 41 has a cylindrical structure, and the end of the positioning rod 43 away from the operating block 44 slides out of the placement plate 5. The end of the positioning rod 43 is fixedly connected to an anti-slip block 47. The anti-slip block 47 improves the friction at the contact position.

[0026] Specifically, the adjustment port 3 has a racetrack-shaped structure, which facilitates the movement of the movable block 41 of the clamping component 4 within the adjustment port 3. The top of the placement plate 5 is recessed with a placement groove for inserting the mold supporting the hydraulic cylinder.

[0027] Before the mold is placed into the placement plate 5, manually pinch the operating block 44 of the clamping assembly 4 and pull the positioning rod 43 to both sides. The anti-slip block 47 fixed to the end of the positioning rod 43 moves towards the movable cavity 42, thereby preventing the positioning rod 43 from obstructing the placement of the mold. After the mold is placed into the placement plate 5, the spring 45 of the clamping assembly 4 causes the positioning rod 43 to move towards the mold. Finally, the anti-slip block 47 abuts against the outside of the mold inside the placement plate 5, thereby clamping and fixing the mold and ensuring its stability. The clamping assembly 4 can be released from clamping and fixing the mold, and the mold can be removed from the placement plate 5, achieving quick assembly and disassembly.

[0028] Specifically, the pressing component 8 includes an operating handle 81, a transmission rod 82, a support connecting rod 83, and a base 84. The base 84 is fixedly connected to the top of the fixing plate 7. The base 84 is slidably sleeved with the movable rod 9. Both ends of the base 84 are respectively hinged to one end of the support connecting rod 83. The other end of the support connecting rod 83 is respectively hinged to the corner of the transmission rod 82. One end of the transmission rod 82 is hinged to one end of the movable rod 9. The other end of the transmission rod 82 is fixedly connected to the operating handle 81.

[0029] The manual operation handle 81 of the pressing component 8 drives the fixed transmission rod 82 to move. The transmission rod 82 has an L-shaped structure and works with the hinged support rod 83 and base 84 to drive the end-hinged movable rod 9 to move down or up. When the movable rod 9 moves down, it drives the connector 10 to move down. The connector 10 is inserted into the oil cylinder test interface to realize the airtightness test function of the oil cylinder. When the movable rod 9 is raised, it drives the connector 10 to disengage from the oil cylinder, so that the oil cylinder can be replaced after the test is completed.

[0030] Specifically, the positioning assembly 11 includes a positioning plate 111, a connecting shaft 112, a bayonet 113, a guide block 114, a torsion spring 115, and a cylindrical groove 116. The connecting shaft 112 is rotatably connected to the side of the base plate 1 near the support column 6. The connecting shaft 112 passes through the base plate 1 and is fixedly connected to one end of the positioning plate 111. The positioning plate 111 is movably disposed on both sides of the base plate 1, and the other end of the positioning plate 111 is provided with a bayonet 113. The guide block 114 is fixedly connected to the inner side of the bayonet 113 of the positioning plate 111. The ends of the connecting shaft 112 are respectively fitted with torsion springs 115, and the torsion springs 115 are disposed in the cylindrical grooves 116 opened on both sides of the base plate 1. One end of the torsion spring 115 is fixedly connected to the positioning plate 111, and the other end of the torsion spring 115 is fixedly connected to the cylindrical grooves 116 on both sides of the base plate 1.

[0031] The placement plate 5 moves toward the end of the slide groove 2. The positioning rod 43 of the clamping assembly 4 first contacts the guide block 114 of the positioning assembly 11. The bottom inclined surface of the guide block 114 slides in contact with the outer wall of the positioning rod 43. The reverse force of the positioning rod 43 causes the guide block 114 to lift up. The guide block 114 drives the fixed positioning plate 111 to swing around the connecting shaft 112. When the placement plate 5 moves to the end of the slide groove 2, the torsion force of the torsion spring drives the connecting shaft 112 to rotate. The connecting shaft 112 drives the positioning rod 111 to rotate. The positioning plate 111 then makes the bayonet 113 lock outside the positioning rod 43, realizing the locking of the positioning assembly 11 and the clamping assembly 4, that is, the placement plate 5 is in place. If the positioning rod 43 is not locked in the bayonet 113, the placement plate 5 is not in place. Then it is necessary to continue to move the placement plate 5. After the placement plate 5 is in place, the hydraulic cylinder test interface is located directly below the connector 10.

[0032] Example 3

[0033] Reference Figure 1-4This is the third embodiment of the present invention. Based on the previous two embodiments, in use, the top of the placement plate 5 has a recessed placement groove for inserting a mold supporting the hydraulic cylinder. The bottom of the mold supporting the hydraulic cylinder is rectangular, and the top has a placement groove matching the shape of the hydraulic cylinder. The hydraulic cylinder to be tested is placed in the placement groove of the mold, with the test interface located at the top. Before the mold is inserted into the placement plate 5, the operating block 44 of the clamping assembly 4 is manually pinched, and the positioning rod 43 is pulled to both sides. The anti-slip block 47 fixed to the end of the positioning rod 43 moves towards the movable cavity 42, thereby... To prevent the positioning rod 43 from obstructing the placement of the mold, after the mold is placed into the placement plate 5, the spring 45 of the clamping assembly 4 causes the positioning rod 43 to move towards the mold. Finally, the anti-slip block 47 presses against the outside of the mold inside the placement plate 5, thereby clamping and fixing the mold and ensuring its stability. Then, the mold is pushed, and the mold causes the placement plate 5 to move within the slide groove 2. When the placement plate 5 moves to the end of the slide groove 2, the positioning rod 43 of the clamping assembly 4 first contacts the guide block 114 of the positioning assembly 11. The bottom inclined surface of the guide block 114 slides against the outer wall of the positioning rod 43. Upon contact, the reverse force of the positioning rod 43 causes the guide block 114 to lift. The guide block 114 then drives the fixed positioning plate 111 to swing around the connecting shaft 112. When the placement plate 5 moves to the end of the slide groove 2, the torsional force of the torsion spring causes the positioning plate 111 to rotate. The positioning plate 111 then causes the bayonet 113 to engage with the outer wall of the positioning rod 43 near the end, thus engaging the positioning component 11 with the clamping component 4, i.e., the placement plate 5 is in place. If the positioning rod 43 is not engaged in the bayonet 113, the placement plate 5 is not in place, and it is necessary to continue moving the placement plate 5. After the plate 5 is in place, the cylinder test interface is located directly below the connector 10. Then, manually operate the operating handle 81 of the pressing component 8. The operating handle 81 drives the fixed transmission rod 82 to move. The transmission rod 82 has an L-shaped structure and works with the hinged support rod 83 and base 84 to drive the end-hinged movable rod 9 to move down. The movable rod 9 drives the connector 10 to move down, and the connector 10 is inserted into the cylinder test interface. The connector 10 is connected to the air tightness tester through the pipeline. The air tightness tester can be the LSSD-01 type air tightness tester to test the air tightness of the cylinder.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the tightness of a cylinder, comprising a base plate (1), characterized in that: The top side of the bottom plate (1) is recessed with a sliding groove (2), both sides of the sliding groove (2) are respectively provided with an adjusting opening (3), the adjusting opening (3) is slidably provided with a clamping assembly (4), the clamping assembly (4) is respectively fixedly connected to the middle part of the two ends of the placement plate (5), the placement plate (5) is slidably arranged in the sliding groove (2), and the both sides of the bottom plate (1) are movably provided with a positioning assembly (11), one end of the positioning assembly (11) is close to the adjusting opening (3), and the positioning assembly (11) is used for clamping the clamping assembly (4); One end of the bottom plate (1) is fixedly connected with the one end of the support (6) on the other side of the top, the other end of the support (6) is fixedly connected with the bottom of one side of the fixed plate (7), the other side of the fixed plate (7) is slidably sleeved with the movable rod (9), one end of the movable rod (9) is hingedly connected with the pressing assembly (8), the pressing assembly (8) is movably arranged on the top of the fixed plate (7), the other end of the movable rod (9) is fixedly connected with the connector (10), and the connector (10) is movably arranged on the bottom of the fixed plate (7).

2. The oil cylinder air tightness testing device according to claim 1, wherein: The positioning assembly (11) comprises a positioning plate (111), a connecting shaft (112), a bayonet (113), a guide block (114), a torsional spring (115) and a cylindrical groove (116). The connecting shaft (112) is rotatably connected to one side of the bottom plate (1) close to the support (6). The connecting shaft (112) penetrates the bottom plate (1) and is fixedly connected with one end of the positioning plate (111). The positioning plate (111) is movably arranged on both sides of the bottom plate (1), and the other end of the positioning plate (111) is provided with a bayonet (113). The inner side of the bayonet (113) of the positioning plate (111) is fixedly connected with the guide block (114). The end of the connecting shaft (112) is sleeved with the torsional spring (115), and the torsional spring (115) is arranged in the cylindrical groove (116) arranged on both sides of the bottom plate (1). One end of the torsional spring (115) is fixedly connected with the positioning plate (111), and the other end of the torsional spring (115) is fixedly connected in the cylindrical groove (116) arranged on both sides of the bottom plate (1).

3. The oil cylinder air tightness testing device of claim 1, wherein: The clamping assembly (4) comprises a movable block (41), an active cavity (42), a positioning rod (43), an operating block (44), a spring (45) and a limiting ring (46). The movable block (41) is slidably arranged in the adjusting opening (3). One end of the movable block (41) is fixedly connected with the outer wall of the placement plate (5). The other end of the movable block (41) is slidably sleeved with the positioning rod (43). One side of the positioning rod (43) is fixedly connected with the operating block (44). The operating block (44) is movably arranged outside the movable block (41). The other side of the positioning rod (43) is fixedly sleeved with the limiting ring (46). The limiting ring (46) is slidably arranged in the active cavity (42). The active cavity (42) is hollowly arranged in the movable block (41). One side of the limiting ring (46) is fixedly connected with one end of the spring (45). The other end of the spring (45) is fixedly connected with the inner wall of the active cavity (42).

4. The oil cylinder air tightness testing device of claim 3, wherein: The movable block (41) is in a cylindrical structure, one end of the positioning rod (43) slides out of the placement plate (5) away from the operating block (44), and the end of the positioning rod (43) is fixedly connected with an anti-skid block (47).

5. The oil cylinder air tightness testing device of claim 1, wherein: The adjusting opening (3) is in a runway type structure.

6. The oil cylinder air tightness testing device of claim 1, wherein: The lower pressing assembly (8) comprises an operating handle (81), a transmission rod (82), a supporting connecting rod (83) and a base (84), the base (84) is fixedly connected with the top end of the fixed plate (7), the base (84) is slidably sleeved with the movable rod (9), the two ends of the base (84) are respectively hingedly connected with one end of the supporting connecting rod (83), the other end of the supporting connecting rod (83) is respectively hingedly connected with the corner part of the transmission rod (82), one end of the transmission rod (82) is hingedly connected with one end of the movable rod (9), and the other end of the transmission rod (82) is fixedly connected with the operating handle (81).

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