Rotary joint airtightness test equipment
By using a water-sealing environment and a connecting pipe liquid level higher than the liquid level of the test chamber in the rotary joint air-tight test equipment, the problems of detection error and hysteresis in the prior art are solved, and fast and accurate sealing detection is achieved.
Patent Information
- Application Number
- CN202411466336.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-02-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing rotary joint airtight testing equipment has errors and hysteresis when detecting sealing, mainly because the leaked gas needs to fill the test chamber and monitoring tube to act on the liquid, resulting in delay in judgment.
A rotary joint air-tight testing equipment is designed, and the test is carried out using a water-sealed environment. The liquid level inside the connecting pipe is higher than the height inside the test box. When the liquid penetrates into the rotary joint, the liquid level drops and can determine the leakage. The response time is short and accurate.
By testing under a water-sealed environment, leakage of the rotary joint can be detected at the first time, with short response time and small errors, which improves the accuracy and sensitivity of the test.
Smart Images
Figure CN119533774A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of sealing detection, and in particular to a rotary joint airtightness testing device. Background Art
[0002] A rotary joint is a connection and sealing device that transfers fluid media from a stationary pipe to a rotating or reciprocating device and then discharges it from the rotary joint. The joint of a rotary joint usually uses seals to ensure its overall sealing. However, after long-term use, the seals will wear out, which will affect the sealing of the rotary joint. In severe cases, it may even cause leakage of the transported fluid. Therefore, it is necessary to test the rotary joint regularly.
[0003] In the prior art, when testing a rotary joint, the method that is often used is to pressurize air into the connector and observe the pressure changes inside the connector to determine whether the sealing is up to standard. In order to facilitate observation, some also connect a pressure monitoring tube to the bottom of the test box. For example, the patent number disclosed in the prior art is CN2024102971579, and the name is a low-temperature rotary joint airtightness test device for LNG loading arm. In this device, a monitoring tube is connected to the bottom of the test chamber. Once the rotary joint leaks, the gas will enter the monitoring tube, and then the gas will act on the liquid inside the monitoring tube to flow, and the sealing of the rotary joint will be determined by the flow of the liquid. However, there is a certain amount of space inside the test chamber and the monitoring tube. If the rotary joint leaks, the leaked gas must first fill the test chamber and the monitoring tube, and then act on the liquid inside the monitoring tube to make the liquid flow. In this case, judging the sealing of the rotary joint by the flow of the liquid will actually have certain errors and hysteresis. Summary of the invention
[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a rotary joint airtightness testing device.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rotary joint airtightness testing device, comprising a mounting plate arranged inside a test box, a connector for sealing both ends of the rotary joint installed below the mounting plate, one of the connectors being connected to a vacuum pumping device on the upper end of the mounting plate, and a connecting pipe being vertically connected to the bottom end of one side of the test box. When the rotary joint is tested, the rotary joint is fixed between the two connectors, and a closed structure is formed between the bottom of the mounting plate and the inside of the test box, and the closed structure is filled with fluid, and the fluid level inside the connecting pipe is higher than the height of the mounting plate.
[0006] Preferably, a plurality of through holes are opened at the periphery of the plate surface of the mounting plate, and a blocking column is fixedly connected to the bottom of the test box in the vertical direction at the position corresponding to each through hole. When the mounting plate moves downward inside the test box until the blocking column contacts the corresponding through hole, a closed structure is formed below the mounting plate and the test box, and a sealing sleeve with a conical structure is also integrally formed and connected to the circumferential surface of each blocking column.
[0007] Preferably, a protective cylinder with a conical structure is connected to the opening at the top of the connecting tube, and a collecting cylinder is fixed on the circumferential surface of the connecting tube near the top thereof.
[0008] Preferably, the two connectors move synchronously toward or away from each other along the length direction of the mounting plate, and the connector includes a T-shaped frustum, the small diameter end of the T-shaped frustum is adapted to the inner diameter of the rotary joint, and a conical rubber ring is distributed on the outer periphery of the small diameter end of the T-shaped frustum, and the conical rubber ring is connected to the large diameter end of the T-shaped frustum, and the two ends of the rotary joint are respectively inserted into the area formed by the conical rubber ring and the small diameter end of the T-shaped frustum.
[0009] Preferably, two guide rail frames are symmetrically fixed to the lower end of the mounting plate, two guide rails are arranged between the two guide rail frames, slide plates are slidably sleeved on the two guide rails, and two connectors are respectively mounted on the slide plates.
[0010] Preferably, a connecting short rod is radially fixed on the circumferential surface of the large diameter end of one of the T-shaped cones, and the connecting short rod is fixedly connected to the skateboard via a supporting fixing rod; a limiting column is integrally formed at the center of the back of the other T-shaped cone, and a center axis is fixedly connected to the end of the limiting column facing the skateboard, and the center axis is connected to a motor drive installed on the back of the skateboard.
[0011] Preferably, a T-shaped truncated cone connected to the vacuum device is integrally formed with a hollow cylinder on one side facing the slide plate, a hollow sliding rod is provided at the center of the hollow cylinder along its axial direction, one end of the sliding rod extends to the inside of the hollow cylinder and is fixedly connected to a spline shaft, the spline shaft extends along the axial direction of the T-shaped truncated cone and penetrates the outside thereof and is fixedly connected to a blocking plate, a plurality of ventilation grooves connected to the inside of the hollow cylinder are annularly distributed on the circumferential surface of the sliding rod located in the inner area of the hollow cylinder, a filter screen is installed in each ventilation groove, the other end of the sliding rod penetrates the slide plate and is connected to a telescopic tube, and the telescopic tube is connected to the inside of the vacuum device through the exhaust pipe; The sliding rod is connected with the sliding plate in a sliding cooperation manner; A conical frame is arranged outside the hollow cylinder, the small diameter end of the conical frame is fixedly sleeved on the circumferential surface of the sliding rod, and the large diameter end is slidably sleeved on the circumferential surface of the large diameter end of the T-shaped frustum, and a matching limiting groove is formed at the position of the large diameter end of the conical frame corresponding to the connection position of the short rod, and the length of the limiting groove is matched with the thickness of the conical rubber ring; A first spring is sleeved on the circumferential surface of the sliding rod, one end of the first spring is fixedly connected to the small diameter end of the conical frame, and the other end is connected to the empty cylinder.
[0012] Preferably, a conical frame is also provided on the outside of the limiting column, the large diameter end of the conical frame is slidably sleeved on the circumferential surface of the large diameter end of the T-shaped truncated cone, and the small diameter end is sleeved on the central axis, and a plurality of limiting ribs are formed on the circumferential surface of the central axis extending radially outward, and a rib groove matching the limiting rib is formed on the inner side of the small diameter end of the conical frame, and the conical frame maintains a sliding fit with the T-shaped truncated cone in the axial direction through the cooperation of the limiting rib and the rib groove; A rotating circle is also rotatably mounted on the large diameter end of the conical frame, and two electric telescopic rods are fixed on the circumferential surface of the other conical frame, and the movable end of each electric telescopic rod is fixedly connected to the corresponding rotating circle; A second spring is sleeved on the circumferential surface of the central axis, one end of the second spring is connected to the limiting column, and the other end is connected to the small diameter end of the conical frame.
[0013] Preferably, two clamping mechanisms for clamping and fixing the rotary joint are arranged below the mounting plate at a position between the two connectors.
[0014] Preferably, the clamping mechanism includes a T-block, the bottom of the T-block is symmetrically hinged with two clamping rings, the two clamping rings together form a circular ring structure that matches the outer diameter of the rotary joint, and oil cylinders are hingedly installed between the two sides of the T-block and the tops of the two clamping rings; two first cylinders are fixed to the upper end of the mounting plate in the vertical direction, and the piston end of each first cylinder penetrates downward through the mounting plate and is fixedly connected to the corresponding T-block.
[0015] Compared with the prior art, the present invention provides a rotary joint airtightness test device, which has the following beneficial effects: (1) When the present invention performs an air tightness test on the rotary joint, it is carried out in a water-tight environment, and the liquid level inside the connecting pipe is higher than the height of the mounting plate inside the test box. As long as there is a leak in the rotary joint, the liquid inside the test box penetrates into the rotary joint, and the liquid inside the connecting pipe will drop immediately. Such a structure not only shortens the test response time, but also ensures the accuracy of the test.
[0016] (2) In the present invention, the two connectors can be synchronously moved toward the rotary joint under the action of the electric telescopic rod, and the conical frame on the connector can continue to exert force on the conical rubber ring under the action of the electric telescopic rod, so that the conical rubber ring exerts extrusion force on both ends of the rotary joint, thereby ensuring the sealing of the connector and the rotary joint and avoiding its influence on the accuracy of the test. At the same time, when the conical frame exerts force on the conical rubber ring, it can also drive the blocking plate to move, so that the vacuum device is connected to the inside of the rotary joint. After the test is completed, when the connector and the rotary joint are disassembled, the blocking plate immediately cuts off the connection between the vacuum device and the outside, which is equivalent to installing an automatic valve at the end of the vacuum device pipeline. The automatic valve can be automatically operated as the connector and the rotary joint are connected, avoiding personnel from manually performing this operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of the test equipment in the embodiment; Figure 2 It is a front view schematic diagram of the test equipment in the embodiment; Figure 3 This is a schematic diagram of the test device in the embodiment when it is in working state; Figure 4 This is a schematic diagram of a rotary joint installed and fixed between two connectors in an embodiment; Figure 5 This is a schematic diagram of the state when the clamping mechanism in the embodiment clamps the rotary joint; Figure 6 This is a schematic diagram of the connector structure in a fixed state in the embodiment; Figure 7 This is a schematic diagram of the internal structure of the connector in a fixed state in the embodiment; Figure 8 It is a schematic diagram of the connection and assembly of the sliding rod and the spline shaft in the embodiment; Fig. 9 It is a structural schematic diagram of the clamping mechanism in the embodiment; Fig.10 This is a schematic diagram of the connector structure in a rotating state in the embodiment; Fig.11 It is a schematic diagram of the disassembly of the conical frame, the limiting column and the central axis in the embodiment.
[0018] In the figure: 1, test box; 2, water guide surface; 3, connecting pipe; 4, collecting tube; 5, protective tube; 6, mounting plate; 7, first cylinder; 8, through hole; 9, vacuum device; 10, exhaust pipe; 11, slide plate; 12, clamping mechanism; 121, clamping ring; 122, T-block; 123, oil cylinder; 13, electric telescopic rod; 14, guide rail; 15, second cylinder; 16, blocking column; 17, sealing sleeve; 18, guide rail frame ; 19. Motor; 20. Telescopic tube; 21. Conical rubber ring; 22. Support fixing rod; 23. Connecting short rod; 24. Limiting groove; 25. Conical frame; 26. T-type frustum; 27. Empty cylinder; 28. Blocking plate; 29. Spline shaft; 30. Sliding rod; 31. First spring; 32. Ventilation groove; 33. Limiting column; 34. Second spring; 35. Rotating circle; 36. Center axis; 37. Limiting rib; a. Rotary joint. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.
[0020] This embodiment provides a rotary joint airtightness testing device, such as Figures 1 to 11As shown, it includes a mounting plate 6 arranged inside the test box 1, and connectors for sealing the two ends of the rotary joint a are installed below the mounting plate 6, one of the connectors is connected to the vacuum device 9 at the upper end of the mounting plate 6, and a connecting pipe 3 is also connected to the bottom end of one side of the test box 1 in the vertical direction. When the rotary joint a is tested, the rotary joint a is fixed between the two connectors, and the lower part of the mounting plate 6 and the inside of the test box 1 form a closed structure, and the closed structure is filled with fluid, and the fluid level in the connecting pipe 3 is higher than the height of the mounting plate 6. Since the rotary joint a is in the closed structure and the closed structure The structure is filled with liquid, so when the vacuum device 9 vacuums the inside of the rotary joint a and there is a leak at the connection of the rotary joint a, the liquid in the closed structure will enter the inside of the rotary joint a. At this time, the liquid level at the top of the connecting tube 3 is higher than the height of the mounting plate 6, so the liquid pressure at the top of the connecting tube 3 is higher than the pressure of the liquid inside the closed structure. Therefore, if the rotary joint a leaks, the most intuitive manifestation is that the liquid level inside the connecting tube 3 drops, and the liquid in the test environment (in the closed structure) replaces the air in the prior art, which can eliminate the test error and improve the sensitivity of the test.
[0021] Specifically, in order to allow the closed structure to be smoothly filled with liquid, the present invention provides a plurality of through holes 8 around the plate surface of the mounting plate 6, and a blocking column 16 is fixedly connected to the bottom of the test box 1 at a position corresponding to each through hole 8 in the vertical direction. In the initial state, the mounting plate 6 is located above the test box 1, and the four corners inside the test box 1 are respectively fixed with second cylinders 15. The mounting plate 6 is driven by the four second cylinders 15 to move in the vertical direction, and the cross section of the mounting plate 6 is consistent with the cross section of the inside of the cavity of the test box 1. After the rotary joint a to be tested is installed under the mounting plate 6, the mounting plate 6 moves downward inside the test box 1. Since the through holes 8 are provided on the mounting plate 6, the mounting plate 6 moves downward inside the test box 1. Therefore, the air inside the test box 1 will be continuously discharged through the through hole 8. When the mounting plate 6 moves downward until it contacts the liquid surface, the liquid inside the test box 1 will flow into the top of the mounting plate 6 through the through hole 8. At this time, all the air between the bottom of the mounting plate 6 and the inside of the test box 1 is emptied. When the mounting plate 6 continues to move downward until the blocking column 16 contacts the corresponding through hole 8, the bottom of the mounting plate 6 and the test box 1 form a closed structure. When the mounting plate 6 continues to move downward, it will drive the liquid surface inside the connecting tube 3 to rise. After the through hole 8 slides downward along the circumferential surface of the blocking column 16 until it is in close contact with the sealing sleeve 17, the liquid surface inside the connecting tube 3 just rises to its top. After the rotary joint a completes the test, the second cylinder 15 drives the mounting plate 6 to move upward. When the through hole 8 is out of contact with the blocking column 16, the liquid above the mounting plate 6 flows back to the inside of the test box 1 through the through hole 8. In addition, since the rotary joint a is installed below the mounting plate 6, when the rotary joint a is disassembled or installed, the mounting plate 6 is required to move upward to the outside of the test box 1 so that there is enough space to disassemble and assemble the rotary joint a. However, since the cross-section of the mounting plate 6 is consistent with the cavity of the test box 1, when the liquid above the mounting plate 6 cannot quickly flow back to the inside of the test box 1 through the through hole 8, after the mounting plate 6 moves to the top of the test box 1, the liquid can also flow along the edge of the mounting plate 6 to the water guiding surface 2 on the top of the test box 1. Since the water guiding surface 2 is arranged around the test box 1 and has an inclined structure, the liquid falling from the mounting plate 6 can flow to the inside of the test box 1 under the action of the water guiding surface 2.
[0022] When the second cylinder 15 drives the mounting plate 6 to move downward inside the test box 1, the liquid surface inside the connecting tube 3 will be driven to rise. In order to prevent the mounting plate 6 from moving and driving the liquid to gush upward inside the connecting tube 3 to the outside, the present invention also fixes a collecting tube 4 on the circumferential surface near the top of the connecting tube 3. Once liquid gushes out, the liquid will also fall into the collecting tube 4 to avoid waste. Moreover, the present invention can not only use the vacuum device 9 to perform a vacuum test on the rotary joint a, but also perform a positive pressure test, that is, the air blowing device replaces the vacuum device 9 to press gas into the rotary joint a. Once there is a leak in the rotary joint a, the leaked gas will act on the liquid inside the connecting tube 3 to make the liquid rise. During the test, if the leaking gap suddenly increases due to the pressure, the liquid inside the connecting tube 3 will accumulate and increase in a short time. The liquid directly sprays out from the opening of the connecting tube 3, which will cause harm to personnel. Based on this, the present invention also connects a protective tube 5 with a conical structure to the opening at the top of the connecting tube 3. The gushing liquid hits the protective tube 5 and then flows into the collecting tube 4 under the action of gravity.
[0023] As a preferred embodiment, this embodiment also has two clamping mechanisms 12 for clamping and fixing the rotary joint a at a position between the two connecting heads below the mounting plate 6. The clamping mechanism 12 can realize automatic loading. The clamping mechanism 12 clamps the rotary joint a and drives it to move between the two connecting heads, and accurately controls the coaxiality of the rotary joint a and the connecting heads, so that the rotary joint a can be quickly and smoothly connected to the two connecting heads.
[0024] Specifically, the above-mentioned clamping mechanism 12 includes a T-block 122, and two clamping rings 121 are symmetrically hinged at the bottom of the T-block 122. The two clamping rings 121 are surrounded to form a circular ring structure that is compatible with the outer diameter of the rotary joint a. Cylinders 123 are hingedly installed between the two sides of the T-block 122 and the tops of the two clamping rings 121; two first cylinders 7 are fixed to the upper end of the mounting plate 6 in the vertical direction, and the piston end of each first cylinder 7 penetrates downward through the mounting plate 6 and is fixedly connected to the corresponding T-block 122. When installing the rotary joint a, the mounting plate 6 is first driven by the second cylinder 15 to move upward to the outside of the test box 1. At this time, the two first cylinders 7 drive the clamping mechanism 12 to move downward. Then, the person holds the rotary joint a and places it between the two clamping rings 121. At this time, the two oil cylinders 123 are started. The oil cylinders 123 drive the two clamping rings 121 to rotate toward each other to clamp the rotary joint a. Finally, the first cylinders 7 retract to transport the rotary joint a to between the two connectors.
[0025] Two guide rail frames 18 are symmetrically fixed to the lower end of the mounting plate 6, two guide rails 14 are arranged between the two guide rail frames 18, slide plates 11 are slidably sleeved on the two guide rails 14, and two connectors are respectively mounted on the slide plates 11. When the rotary joint a is transported between the two connectors by the clamping mechanism 12, the two connectors synchronously move toward each other along the length direction of the mounting plate 6 and move toward the rotary joint a to be tightly connected therewith. The connector in this embodiment includes a T-shaped cone 26, the small diameter end of the T-shaped cone 26 is adapted to the inner diameter of the rotary joint a, and a conical rubber ring 21 is distributed on the outer periphery of the small diameter end of the T-shaped cone 26, and the conical rubber ring 21 is connected to the large diameter end of the T-shaped cone 26. The two ends of the rotary joint a are respectively inserted into the area formed by the conical rubber ring 21 and the small diameter end of the T-shaped cone 26. The sealing performance of the connection between the T-shaped cone 26 and the rotary joint a also affects the accuracy of the test of the rotary joint a, and the sealing performance of the connection between the rotary joint a and the T-shaped cone 26 depends on the conical rubber ring 21. By applying a force to the conical rubber ring 21, the conical rubber ring 21 is tightly pressed against the outer circumferential surface of the rotary joint a to ensure the sealing performance of the connection.
[0026] In this embodiment, two T-shaped truncated cones 26 are arranged on the slide 11, and a connecting short rod 23 is fixed radially on the circumferential surface of the large diameter end of one of the T-shaped truncated cones 26, and the connecting short rod 23 is fixedly connected to the slide 11 through the supporting fixing rod 22. A limiting column 33 is integrally formed at the back center of the other T-shaped truncated cone 26, and a central shaft 36 is fixedly connected to the end of the limiting column 33 facing the slide 11, and the central shaft 36 is connected to the motor 19 installed on the back of the slide 11. In other words, one of the two connectors in this embodiment is in a fixed state, and the other can rotate, and the static air tightness test and dynamic air tightness test can be performed on the rotary joint a according to actual needs.
[0027] Regarding the force applied to the conical rubber ring 21, in this embodiment, a conical frame 25 is selected to be arranged on the side of the two T-shaped truncated cones 26 facing away from each other. The conical frame 25 is slidably sleeved on the large diameter end of the T-shaped truncated cone 26. The two conical frames 25 are driven by the electric telescopic rod 13 to move synchronously toward or away from each other. When the electric telescopic rod 13 slides on the T-shaped truncated cone 26, it acts on the conical rubber ring 21. The conical rubber ring 21 is pressed against the surface of the rotary joint a by utilizing its own shape, thereby tightly connecting the T-shaped truncated cone 26 and the rotary joint a. The movement of the two slides 11 is also driven by the electric telescopic rod 13. Although the electric telescopic rod 13 acts on the two conical frames 25 to make the conical rubber ring 21 tightly pressed against the outer circumferential surface of the rotary joint a, when the rotary joint a is disassembled, the electric telescopic rod 13 drives the two conical frames 25 to move away from each other, and the T-shaped frustum 26 also has a tendency to move synchronously with the conical frame 25 under the action of friction. At this time, there are two possibilities. The first is that the conical frame 25 moves relative to the conical rubber ring 21, that is, the conical frame 25 first breaks away from the contact with the conical rubber ring 21, and then the conical rubber ring 21 recovers its own deformation. At this time, the rotary joint a can be taken out from the area between the conical rubber ring 21 and the T-shaped frustum 26. The second possibility is that the friction between the conical rubber ring 21 and the conical frame 25 is large, and the two always move synchronously toward the direction of the slide 11. The conical frame 25 is moved so that the rotary joint a is forcibly separated from the conical rubber ring 21 and the T-shaped cone 26. When the conical frame 25 is sleeved on the outside of the conical rubber ring 21, it will affect the connection of the next rotary joint a. In order to avoid this situation, the rotatable conical frame 25 is taken as an example for explanation. The conical frame 25 is arranged on the outside of the limiting column 33. The small diameter end of the conical frame 25 is sleeved on the central shaft 36. A plurality of limiting ribs 37 are formed on the circumferential surface of the central shaft 36 extending radially outward. A rib groove matched with the limiting rib 37 is formed on the inner side of the small diameter end of the conical frame 25. The conical frame 25 maintains a sliding fit with the T-shaped cone 26 in the axial direction through the cooperation of the limiting rib 37 and the rib groove. A second spring 34 is sleeved on the circumferential surface of the central shaft 36. One end of the second spring 34 is connected to the limiting column 33, and the other end is connected to the small diameter end of the conical frame 25. When the electric telescopic rod 13 drives the conical frame 25 to squeeze the conical rubber ring 21, the second spring 34 will be compressed. When the rotary joint a needs to be disassembled, the conical frame 25 is first detached from the conical rubber ring 21 under the action of the second spring 34 and reset to the large diameter end of the T-shaped cone 26. At this time, the electric telescopic rod 13 can drive the slide plate 11 and the T-shaped cone 26 away from the rotary joint a, so that the rotary joint a can be easily disassembled.
[0028] It should be further pointed out that, since the conical frame 25 outside the limiting column 33 is rotatable, a rotating ring 35 is rotatably installed on the large diameter end of the conical frame 25, and the fixed ends of the two electric telescopic rods 13 are connected to the fixed rotating ring 35, while the movable ends are fixedly connected to the rotating ring 35.
[0029] In this field, when the vacuum device 9 is connected to the test piece, a valve is usually set at the end of the vacuum tube (the valve is set at the end of the vacuum tube, so that when the vacuum device 9 is idle, external foreign matter can be prevented from entering the vacuum pipe to the greatest extent). After the vacuum tube is connected to the test piece, the valve is opened and the vacuum device 9 is started to vacuum. After the test is completed, the personnel also need to manually close the valve to cut off the connection between the end of the vacuum tube and the outside world. However, this embodiment can achieve that the vacuum device 9 is connected to the inside of the rotary joint a while the conical frame 25 presses the conical rubber ring 21, and when the conical frame 25 and the conical rubber ring 21 are separated, the end of the vacuum tube of the vacuum device 9 is quickly cut off from the outside world.
[0030] In order to achieve the above-mentioned effects, the present invention has an empty cylinder 27 integrally formed on the side of the T-shaped cone 26 connected to the vacuum pumping device 9 facing the slide plate 11, and a hollow sliding rod 30 is provided at the center of the empty cylinder 27 along its axial direction, one end of the sliding rod 30 extends to the inside of the empty cylinder 27 and is fixedly connected to a spline shaft 29, the spline shaft 29 extends along the axial direction of the T-shaped cone 26 to penetrate the outside thereof and is fixedly connected to a blocking plate 28, a plurality of ventilation grooves 32 connected to the inside of the sliding rod 30 located in the inner area of the empty cylinder 27 are annularly distributed on the circumferential surface of the sliding rod 30, the other end of the sliding rod 30 penetrates the slide plate 11 and is connected to a telescopic tube 20 (the telescopic tube 20 is to adapt to the movement of the connecting head and the sliding rod 30), the telescopic tube 20 is connected to the inside of the vacuum pumping device 9 through the exhaust pipe 10, and the sliding rod 30 is connected to the slide plate 11 in a sliding manner. A conical frame 25 is provided on the outside of the hollow cylinder 27. The small diameter end of the conical frame 25 is fixedly sleeved on the circumferential surface of the sliding rod 30, and the large diameter end is slidably sleeved on the circumferential surface of the large diameter end of the T-shaped frustum 26. A matching limiting groove 24 is formed at the position of the large diameter end of the conical frame 25 corresponding to the connection with the short rod 23, and the length of the limiting groove 24 is just consistent with the thickness of the conical rubber ring 21. In the initial state, the blocking plate 28 forms a blockage on the center of the T-shaped table 26, and the electric telescopic rod 13 drives the T-shaped table 26 to move toward the direction of the rotary joint a. The rotary joint a is first inserted into the annular area of the T-shaped table 26 and the conical rubber ring 21, and then the electric telescopic rod 13 continues to drive the conical frame 25 and the sliding rod 30 to move toward the direction of the rotary joint a. At this time, the blocking plate 28 loses its blockage on the T-shaped table 26, and the interior of the empty cylinder 27 is connected with the rotary joint a. The gas inside the rotary joint a enters into the empty cylinder 27 through the spline shaft 29, and then enters into the sliding rod 30 through the ventilation groove 32, and is finally sucked away by the vacuum device 9.
[0031] It is necessary to add that, in the present invention, a filter screen is installed in each ventilation groove 32, and the filter screen can filter out solid foreign matter inside the rotary joint a to prevent it from entering the vacuum device 9, and the empty cylinder 27 can collect and store the solid foreign matter filtered out by the filter screen. Similarly, in the present invention, a first spring 31 is also sleeved on the circumferential surface of the sliding rod 30, one end of the first spring 31 is fixedly connected to the small diameter end of the conical frame 25, and the other end is connected to the empty cylinder 27, and the first spring 31 can smoothly separate the conical frame 25 and the conical rubber ring 21 on this side.
[0032] In the description of the present invention, the terms "first", "second", "another", and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A rotary joint airtightness test device, characterized in that: The invention comprises a mounting plate (6) arranged inside a test box (1), a connector for sealing the two ends of a rotary joint (a) being mounted below the mounting plate (6), one of the connectors being connected to a vacuum pump (9) at the upper end of the mounting plate (6), a connecting pipe (3) being vertically connected to the bottom end of one side of the test box (1), and when the rotary joint (a) is tested, the rotary joint (a) is fixed between the two connectors, and a closed structure is formed between the bottom of the mounting plate (6) and the inside of the test box (1), and the closed structure is filled with fluid, and the fluid level inside the connecting pipe (3) is higher than the height of the mounting plate (6).
2. The rotary joint airtightness testing device according to claim 1, characterized in that: A plurality of through holes (8) are provided around the plate surface of the mounting plate (6), and a blocking column (16) is fixedly connected in a vertical direction at a position corresponding to each through hole (8) at the bottom of the test box (1). When the mounting plate (6) moves downward inside the test box (1) until the blocking column (16) contacts the corresponding through hole (8), a sealed structure is formed between the bottom of the mounting plate (6) and the test box (1), and a sealing sleeve (17) having a conical structure is integrally formed and connected to the circumferential surface of each blocking column (16).
3. The rotary joint airtightness testing device according to claim 2, characterized in that: A protective cylinder (5) having a conical structure is connected to the opening at the top of the connecting tube (3), and a collecting cylinder (4) is fixed on the circumferential surface of the connecting tube (3) near the top thereof.
4. A rotary joint airtightness testing device according to any one of claims 1 to 3, characterized in that: The two connectors move synchronously toward or away from each other along the length direction of the mounting plate (6). The connector comprises a T-shaped truncated cone (26). The small diameter end of the T-shaped truncated cone (26) is adapted to the inner diameter of the rotary joint (a). A conical rubber ring (21) is distributed on the outer periphery of the small diameter end of the T-shaped truncated cone (26). The conical rubber ring (21) is connected to the large diameter end of the T-shaped truncated cone (26). The two ends of the rotary joint (a) are respectively inserted into the area formed by the conical rubber ring (21) and the small diameter end of the T-shaped truncated cone (26).
5. The rotary joint airtightness testing device according to claim 4, characterized in that: Two guide rail frames (18) are symmetrically fixed to the lower end of the mounting plate (6), two guide rails (14) are arranged between the two guide rail frames (18), a slide plate (11) is slidably sleeved on the two guide rails (14), and two connectors are respectively mounted on the slide plates (11).
6. The rotary joint airtightness testing device according to claim 5, characterized in that: A connecting short rod (23) is fixed radially on the circumferential surface of the large diameter end of one of the T-shaped truncated cones (26), and the connecting short rod (23) is fixedly connected to the slide plate (11) via a supporting fixing rod (22); a limiting column (33) is integrally formed at the back center of the other T-shaped truncated cone (26), and a central shaft (36) is fixedly connected to the end of the limiting column (33) facing the slide plate (11), and the central shaft (36) is drivingly connected to a motor (19) installed on the back of the slide plate (11).
7. The rotary joint airtightness testing device according to claim 6, characterized in that: A hollow cylinder (27) is integrally formed on the side of the T-shaped truncated cone (26) connected to the vacuum pumping device (9) and facing the slide plate (11). A hollow sliding rod (30) is provided at the center of the hollow cylinder (27) and penetrates along its axial direction. One end of the sliding rod (30) extends to the inside of the hollow cylinder (27) and is fixedly connected to a spline shaft (29). The spline shaft (29) extends along the axial direction of the T-shaped truncated cone (26) and penetrates to the outside of the hollow cylinder and is fixedly connected to a blocking plate (28). A plurality of ventilation grooves (32) are distributed in an annular manner on the circumferential surface of the sliding rod (30) located in the inner area of the hollow cylinder (27) and are communicated with the inside thereof. A filter screen is installed in each ventilation groove (32). The other end of the sliding rod (30) penetrates the slide plate (11) and is connected to a telescopic tube (20). The telescopic tube (20) is communicated with the inside of the vacuum pumping device (9) through the exhaust pipe (10). The sliding rod (30) is connected to the sliding plate (11) in a sliding cooperation manner; A conical frame (25) is arranged outside the hollow cylinder (27), the small diameter end of the conical frame (25) is fixedly sleeved on the circumferential surface of the sliding rod (30), and the large diameter end is slidably sleeved on the circumferential surface of the large diameter end of the T-shaped frustum (26), and a matching limiting groove (24) is formed at the position of the large diameter end of the conical frame (25) corresponding to the connection with the short rod (23), and the length of the limiting groove (24) is matched with the thickness of the conical rubber ring (21); A first spring (31) is sleeved on the circumferential surface of the sliding rod (30). One end of the first spring (31) is fixedly connected to the small diameter end of the conical frame (25), and the other end is connected to the hollow cylinder (27).
8. The rotary joint airtightness testing device according to claim 7, characterized in that: A conical frame (25) is also provided outside the limiting column (33). The large diameter end of the conical frame (25) is slidably sleeved on the circumferential surface of the large diameter end of the T-shaped truncated cone (26), and the small diameter end is sleeved on the central axis (36). A plurality of limiting ribs (37) are formed on the circumferential surface of the central axis (36) extending outward in the radial direction. A rib groove matching the limiting rib (37) is formed on the inner side of the small diameter end of the conical frame (25). The conical frame (25) maintains a sliding fit with the T-shaped truncated cone (26) in the axial direction through the cooperation of the limiting rib (37) and the rib groove. A rotating ring (35) is also rotatably mounted on the large diameter end of the conical frame (25), and two electric telescopic rods (13) are fixed on the circumferential surface of the other conical frame (25), and the movable end of each electric telescopic rod (13) is fixedly connected to the corresponding rotating ring (35); A second spring (34) is sleeved on the circumferential surface of the central shaft (36); one end of the second spring (34) is connected to the limiting column (33), and the other end is connected to the small diameter end of the conical frame (25).
9. The rotary joint airtightness testing device according to claim 4, characterized in that: Two clamping mechanisms (12) for clamping and fixing the rotary joint (a) are arranged below the mounting plate (6) at a position between the two connecting heads.
10. The rotary joint airtightness testing device according to claim 9, characterized in that: The clamping mechanism (12) comprises a T-shaped block (122), the bottom of the T-shaped block (122) is symmetrically hinged with two clamping rings (121), the two clamping rings (121) are surrounded together to form a circular ring structure that matches the outer diameter of the rotary joint (a), and oil cylinders (123) are hingedly installed between the two sides of the T-shaped block (122) and the tops of the two clamping rings (121); the upper end of the mounting plate (6) is fixed with two first cylinders (7) in the vertical direction, and the piston end of each first cylinder (7) penetrates downward through the mounting plate (6) and is fixedly connected to the corresponding T-shaped block (122).