A device for detecting the sealing performance of a variable amplitude oil cylinder

Abstract

The utility model relates to the technical field of oil cylinder sealing detection, and disclose a variable amplitude oil cylinder sealing detection device, including work table and cylinder body, the upper surface fixed connection of work table has water tank, the bottom inner wall of water tank is fixedly connected with the bearing station for placing cylinder body, one side outer wall of water tank is fixedly connected with pressure gauge and safety valve, the slide connection of water tank one side through -going has slide rod, one end fixedly connected with the extrusion disc that cylinder body is fixed in the slide rod in water tank, two connecting ends of cylinder body are connected with air inlet pipe and trident pipe respectively, the other end of air inlet pipe is connected with outside air pump. The utility model discloses through being equipped with trident pipe and safety valve, after completing test, the high pressure gas in the cylinder body is slowly released to avoid directly to the cylinder body disassembly high pressure gas sudden release leads to water splashing, effectively increased the security of test.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder sealing performance testing technology, and more specifically to a variable amplitude hydraulic cylinder sealing performance testing device. Background Technology

[0002] As a core hydraulic actuator in construction machinery, the luffing cylinder controls the luffing of the equipment boom through telescopic movement. Its sealing performance directly affects the pressure stability, energy efficiency, and equipment safety of the hydraulic system.

[0003] A search revealed a Chinese patent with publication number CN212409997U, which discloses a hydraulic cylinder sealing test device. This device is equipped with an air meter, which is helpful in detecting whether there is any leakage of gas introduced into the hydraulic cylinder from the air pump, and thus helps to determine the sealing performance of the hydraulic cylinder. However, after the gas is filled, the inside is under high pressure. If the device is disassembled directly after the test, the high pressure gas will be suddenly released, causing water to splash, which poses a certain risk. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a variable amplitude cylinder sealing performance testing device to solve the problems existing in the background art.

[0005] This utility model provides the following technical solution: a variable amplitude hydraulic cylinder sealing performance testing device, comprising a workbench and a cylinder body. A water tank is fixedly connected to the upper surface of the workbench. A support platform for placing the cylinder body is fixedly connected to the bottom inner wall of the water tank. A pressure gauge and a safety valve are fixedly connected to one side outer wall of the water tank. A sliding rod is slidably connected through one side of the water tank. A compression plate for fixing the cylinder body is fixedly connected to one end of the sliding rod inside the water tank. An air inlet pipe and a three-way pipe are respectively connected to two connecting ends of the cylinder body. The other end of the air inlet pipe is connected to an external air pump. The other two ends of the three-way pipe are respectively connected to a pressure gauge and a safety valve.

[0006] As a further embodiment of this utility model, there are at least two support platforms, and two mirror-shaped inclined plates are fixedly connected to the upper surfaces of the two support platforms, forming a V-shaped groove with the support platforms.

[0007] As a further embodiment of this utility model, a fixed platform is fixedly connected to the bottom inner wall of the water tank, and a U-shaped plate is fixedly connected to the upper surface of the fixed platform to block the tail of the cylinder. Protective blocks are glued to both ends of the U-shaped plate.

[0008] As a further embodiment of this utility model, two inverted T-shaped plates are fixedly connected to the upper surface of the workbench. Two symmetrical guide rods are fixedly connected between the two T-shaped plates, and sliders are slidably connected to the two guide rods. A connecting frame is fixedly connected to the upper surface of the slider, and the top end of the connecting frame is fixed to one end of the slider rod. A threaded screw is rotatably connected between the two T-shaped plates, and the threaded screw passes through the slider and is threadedly connected to it. A drive motor that causes the threaded screw to rotate forward and backward along the axial direction is fixedly connected to one side of one of the T-shaped plates.

[0009] As a further embodiment of this utility model, both guide rods are provided with a plurality of insertion holes arranged in a linear array, and the slider is provided with two symmetrical clearance holes, one of which is slidably connected to a pin that cooperates with the insertion hole.

[0010] As a further embodiment of this invention, the plurality of insertion holes on the two guide rods are staggered.

[0011] As a further embodiment of this utility model, the water tank is provided with an inlet pipe and an outlet pipe on one side, and the water tank is filled with liquid, preferably water.

[0012] The technical effects and advantages of this utility model are as follows:

[0013] 1. This utility model, through the provision of a three-pronged pipe and a safety valve, allows the high-pressure gas inside the cylinder to be released slowly after the test is completed, avoiding direct disassembly of the cylinder and the sudden release of high-pressure gas that could cause water splashing, thus effectively increasing the safety of the test.

[0014] 2. This utility model performs a sealing test by filling the water tank with water. The presence, location, frequency, and density of bubbles can be directly observed with the naked eye, allowing for a quick assessment of the tank's sealing performance and effectively increasing the testing efficiency.

[0015] 3. This utility model increases the tolerance for error in fixing the slider by providing two sets of staggered insertion holes, thereby fixing the slider more accurately after it has moved, and ensuring the stability of the cylinder body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front three-dimensional structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the rear three-dimensional structure of this utility model.

[0018] Figure 3 This is a cross-sectional structural diagram of the water tank of this utility model.

[0019] Figure 4 This utility model Figure 3A partially enlarged structural diagram.

[0020] Figure 5 This utility model Figure 1 A partially enlarged structural diagram.

[0021] The attached diagram is labeled as follows: 1. Workbench; 2. Water tank; 3. Slide rod; 4. Extrusion plate; 5. Air inlet pipe; 6. Three-way pipe; 7. Pressure gauge; 8. Safety valve; 9. Support platform; 10. Fixed platform; 11. Inclined plate; 12. U-shaped plate; 13. Protective block; 14. T-shaped plate; 15. Guide rod; 16. Sliding block; 17. Connecting frame; 18. Threaded screw; 19. Insertion hole; 20. Clearance hole; 21. Pin; 22. Drive motor. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Reference Figures 1-5This utility model provides a sealing performance testing device for a variable amplitude hydraulic cylinder, including a workbench 1 and a cylinder body. A water tank 2 is bolted to the upper surface of the workbench 1. A support platform 9 for placing the cylinder body is bolted to the inner bottom wall of the water tank 2. A pressure gauge 7 and a safety valve 8 are bolted to one outer side of the water tank 2. A sliding rod 3 is slidably connected through one side of the water tank 2. A compression plate 4 for fixing the cylinder body is bolted to one end of the sliding rod 3 inside the water tank 2. An air inlet pipe 5 and a three-way pipe 6 are connected to the two ends of the cylinder body, respectively. Through the three-way pipe 6 and the safety valve 8, the high-pressure gas inside the cylinder body is slowly released after the test, avoiding direct disassembly of the cylinder body and the sudden release of high-pressure gas that could cause water splashing. To enhance testing safety, the other end of the air inlet pipe 5 is connected to an external air pump, and the other two ends of the three-way pipe 6 are connected to the pressure gauge 7 and the safety valve 8, respectively. The water tank 2 has an inlet pipe and an outlet pipe on one side, and is filled with liquid, preferably water. Sealing tests are performed by filling the water tank 2 with water. The presence, location, frequency, and density of bubbles can be directly observed visually, allowing for rapid assessment of the cylinder's sealing performance and significantly increasing testing efficiency. The upper surface of the workbench 1 is bolted to two inverted T-shaped plates 14. Two symmetrical guide rods 15 are bolted between the two T-shaped plates 14, and sliders 16 are slidably connected to the two guide rods 15. The upper surface of the sliders 16 is bolted to... A connecting frame 17 is fixed at its top end to one end of a slide rod 3. A threaded screw 18 is rotatably connected between two T-shaped plates 14, and the threaded screw 18 passes through and is threadedly connected to the slider 16. One side of one of the T-shaped plates 14 is bolted to a drive motor 22 that causes the threaded screw 18 to rotate forward and backward along the axial direction. Before testing the sealing performance of the cylinder body, one end of the intake pipe 5 and the three-way pipe 6 are first sealed to the two connecting ends on the cylinder body. After the connection is completed, the cylinder body is placed between two sets of inclined plates 11 on two support platforms 9. Then, the drive motor 22 is started to drive the threaded screw 18 to rotate. During the rotation of the threaded screw 18, it will drive the slider 16 threadedly connected to it to move along the guide rod 15 towards the... The slide bar moves towards the water tank 2, which in turn drives the slide rod 3 to move into the water tank 2 via the connecting bracket 17. During the movement of the slide rod 3, the squeezing plate 4 at its end moves towards the cylinder body. After the two contact, the slide rod 3 needs to move further. The squeezing plate 4 squeezes one end of the cylinder body so that its tail part contacts the protective block 13 on the U-shaped plate 12. The slide rod continues to move, squeezing and fixing the cylinder body while squeezing and sealing the opening of the cylinder body. After the cylinder body is fixed, water is injected into the water tank 2 until the cylinder body is submerged. Then, an external air pump is started to inject gas into the cylinder body through the air inlet pipe 5. The reading of the pressure gauge 7 is observed. When the specified pressure is reached, the air pump is turned off. Then, it is observed whether there are bubbles in the water tank 2. If there are bubbles, the cylinder body seal is unqualified.If no bubbles emerge after observing for a period of time, the cylinder block is qualified in sealing performance. After the test is completed, slowly open the safety valve 8 to slowly discharge the gas inside the cylinder block to avoid high internal pressure. After the pressure is balanced, drain part of the water until the liquid surface is lower than the position of the cylinder block, then start the driving motor 22 to rotate reversely to loosen the cylinder block, thus completing the sealing performance detection operation. ,

[0024] The three-way pipe 6 consists of a three-way joint and three hoses.

[0025] In the present utility model, there are at least two bearing tables 9, the upper surfaces of the two bearing tables 9 are each fixedly connected with two mirror-image inclined plates 11 by bolts, and the two inclined plates 11 and the bearing table 9 form a V-shaped groove.

[0026] In the present utility model, a fixing table 10 is fixedly connected to the inner wall of the bottom of the water tank 2 by bolts, the upper surface of the fixing table 10 is fixedly connected with a U-shaped plate 12 for blocking the tail of the cylinder block by bolts, and protective blocks 13 are adhered to both ends of the U-shaped plate 12.

[0027] In the present utility model, a plurality of insertion holes 19 arranged in a linear array are provided on each of the two guide rods 15, two symmetrical position-avoiding holes 20 are provided on the sliding block 16, one of the position-avoiding holes 20 is slidably connected with a plug pin 21 that cooperates with the insertion hole 19, the plurality of insertion holes 19 on the two guide rods 15 are arranged in a staggered manner. After the position of the cylinder block is placed, the plug pin 21 is pulled out; after the fixing operation of the cylinder block is completed, the plug pin 21 is reinserted into one suitable position-avoiding hole 20, so that the plug pin 21 is inserted into the corresponding insertion hole 19. By providing two groups of staggered insertion holes 19, the fault tolerance for fixing the sliding block 16 can be increased, so that the sliding block 16 can be fixed more accurately after moving, and the stability of cylinder block fixation is ensured.

[0028] When the present utility model is used, it is divided into the following steps:

[0029] S1: Before detecting the sealing performance of the cylinder block, firstly connect one end of the air inlet pipe 5 and one end of the three-way pipe 6 to the two connecting ends on the cylinder block in a sealing manner respectively, and place the cylinder block between the two groups of inclined plates 11 on the two bearing tables 9 after connection is completed;

[0030] S2: After the cylinder body is positioned, pull out the pin 21, then start the drive motor 22 to drive the threaded screw 18 to rotate. During the rotation of the threaded screw 18, it will drive the slider 16 connected to it to move along the guide rod 15 towards the water tank 2, and then drive the slide rod 3 to move into the water tank 2 through the connecting bracket 17 on it. During the movement of the slide rod 3, it will drive the pressing plate 4 at its end to move towards the cylinder body. After the two contact, they need to move. The pressing plate 4 will press one end of the cylinder body so that its tail part contacts the protective block 13 on the U-shaped plate 12. Continue to move to press and fix the cylinder body and press and seal the opening of the cylinder body. Then, the pin 21 is reinserted into one of the suitable clearance holes 20 and then the pin 21 is inserted into the corresponding insertion hole 19.

[0031] S3: After the cylinder body is fixed, water is injected into the water tank 2 until the cylinder body is submerged. Then, the external air pump is started to inject gas into the cylinder body through the air inlet pipe 5. The reading of the pressure gauge 7 is observed. When the specified pressure is reached, the air pump is turned off. Then, observe whether there are bubbles in the water tank 2. If there are, the cylinder body is not sealed. If no bubbles are observed after a period of time, the cylinder body is sealed.

[0032] S4: After the test is completed, slowly open the safety valve 8 to slowly discharge the gas inside the cylinder to avoid internal high pressure. After the pressure is balanced, release some water until the liquid level is below the cylinder. Then, start the drive motor 22 to reverse and loosen the cylinder to complete the sealing test.

[0033] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0034] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.

[0035] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A device for detecting the sealing performance of a variable amplitude cylinder, comprising a workbench (1) and a cylinder body, characterized in that: A water tank (2) is fixedly connected to the upper surface of the workbench (1). A support platform (9) for placing the cylinder is fixedly connected to the bottom inner wall of the water tank (2). A pressure gauge (7) and a safety valve (8) are fixedly connected to one side outer wall of the water tank (2). A sliding rod (3) is slidably connected through one side of the water tank (2). A pressing plate (4) for fixing the cylinder is fixedly connected to one end of the sliding rod (3) inside the water tank (2). An air inlet pipe (5) and a three-way pipe (6) are respectively connected to the two connecting ends of the cylinder. The other end of the air inlet pipe (5) is connected to an external air pump. The other two ends of the three-way pipe (6) are respectively connected to the pressure gauge (7) and the safety valve (8).

2. The amplitude cylinder sealing detection device according to claim 1, characterized in that: There are at least two support platforms (9), and two mirrored inclined plates (11) are fixedly connected to the upper surfaces of the two support platforms (9). The two inclined plates (11) and the support platforms (9) form a V-shaped groove.

3. The amplitude cylinder sealing detection device according to claim 1, wherein: A fixed platform (10) is fixedly connected to the bottom inner wall of the water tank (2). A U-shaped plate (12) for blocking the tail of the cylinder is fixedly connected to the upper surface of the fixed platform (10). Protective blocks (13) are glued to both ends of the U-shaped plate (12).

4. The amplitude cylinder sealing detection device according to claim 1, characterized in that: Two inverted T-shaped plates (14) are fixedly connected to the upper surface of the workbench (1). Two symmetrical guide rods (15) are fixedly connected between the two T-shaped plates (14). A slider (16) is slidably connected to the two guide rods (15). A connecting frame (17) is fixedly connected to the upper surface of the slider (16). The top of the connecting frame (17) is fixed to one end of the slide rod (3). A threaded screw (18) is rotatably connected between the two T-shaped plates (14). The threaded screw (18) passes through the slider (16) and is threadedly connected to it. A drive motor (22) is fixedly connected to one side of one of the T-shaped plates (14) to make the threaded screw (18) rotate forward and backward along the axial direction.

5. The amplitude cylinder sealing detection device according to claim 4, characterized in that: Both guide rods (15) are provided with a plurality of insertion holes (19) arranged in a straight line, and the slider (16) is provided with two symmetrical clearance holes (20), one of which is slidably connected to a pin (21) that is used in conjunction with the insertion hole (19).

6. The amplitude cylinder sealing detection device according to claim 5, characterized in that: Multiple sockets (19) on the two guide rods (15) are staggered.

7. The amplitude cylinder sealing detection device according to claim 1, characterized in that: The water tank (2) is provided with an inlet pipe and an outlet pipe on one side. The water tank (2) is filled with liquid, which is water.

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