A lifting and positioning device for water and oil leak detection

Abstract

The present invention relates to the technical field of air tightness detection equipment, and discloses a lifting and positioning device for water and oil leakage detection, comprising a protective base and a protective outer shell, the protective base is fixed to the ground by bolts, the upper end of the protective base is provided with the protective outer shell, the rear ends of the inner walls of both sides of the protective outer shell are provided with moving devices, the tops of the inner walls of both sides of the protective outer shell are fixedly connected with two symmetrically arranged first sliding bars, the first sliding bars are provided with a fluid reaction force offsetting device, the front side of the moving device is provided with a mounting plate, the mounting plate is provided with a lifting device, the lower end of the lifting device is provided with a detection device fixing plate, the bottom of the detection device fixing plate is provided with a water and oil sealing detection device for detecting the engine cylinder body, the inner cavity of the protective base is provided with a control system, the device uses the fluid reaction force offsetting device to make the compensation force stable and multi-directionally offset, avoid displacement, reduce manual calibration, save costs, and improve production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection equipment, in particular to a lifting and positioning device for water and oil leakage detection. Background Art

[0002] In the production line for extended-range engine cylinder blocks, water and oil leak detection is a critical step in ensuring product sealing and quality reliability. Currently, the industry generally uses flow detection methods to test cylinder blocks for leaks, assessing sealing performance by monitoring changes in fluid flow during filling or leakage. However, existing lifting and positioning devices for water and oil leak detection have significant limitations in coping with fluid reaction forces.

[0003] During flow testing, the reaction force exerted by high-speed flowing water or oil on the cylinder interface can easily interfere with the precise positioning of the cylinder. If the clamping mechanism of the lifting and positioning device is insufficiently rigid, the cylinder will undergo slight displacement under the reaction force, causing the sealing tooling to detach or misalign with the cylinder interface. This not only distorts the test results, resulting in "false leaks" or "false acceptances," seriously affecting product quality assessments, but also accumulates long-term displacement deviations, exacerbating uneven wear of the positioning device's guide mechanism, leading to a significant decrease in repeatable positioning accuracy, making it difficult to obtain accurate and reliable data for subsequent testing. Furthermore, to correct the detection errors caused by positioning deviations, the production line requires frequent manual calibration and equipment debugging, which significantly reduces production efficiency and increases operating costs. Therefore, it is urgent to develop a lifting and positioning device for water and oil leak detection that can effectively resist the interference of fluid reaction forces and ensure precise cylinder positioning to meet the requirements of efficient and high-precision production testing of extended-range engine cylinders. To this end, we propose a lifting and positioning device for water and oil leak detection. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a lifting and positioning device for water and oil leak detection, which solves the above-mentioned problems.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting and positioning device for water and oil leakage detection, comprising a protective base and a protective outer shell, the protective base being fixed to the ground by bolts, the upper end of the protective base being provided with a protective outer shell, the rear ends of the inner walls of both sides of the protective outer shell being provided with moving devices, the tops of the inner walls of both sides of the protective outer shell being fixedly connected with two symmetrically arranged first sliding rods, the first sliding rods being provided with a fluid reaction force offsetting device, a mounting plate being provided at the front side of the moving device, a lifting device being provided on the mounting plate, a detection device fixing plate being provided at the lower end of the lifting device, a water and oil sealing detection device for detecting the engine cylinder block being provided at the bottom of the detection device fixing plate, and a control system being provided in the inner cavity of the protective base;

[0008] The moving device includes a metal protective shell, a translation drive motor, a first slide rail, a threaded drive rod and a horizontal moving seat. The metal protective shell is fixedly connected to the inner walls of both sides of the protective shell body. The inner cavity of the metal protective shell is hollow, and one end is fixedly connected to the translation drive motor. Both ends of the translation drive motor on the side away from the inner wall of the metal protective shell are fixedly connected to the first slide rails, and the other ends of the two first slide rails are fixed to the inner wall of the metal protective shell. The threaded drive rod is fixedly connected to the rotating shaft of the metal protective shell, and the other end of the threaded drive rod is rotatably connected to the inner wall of the metal protective shell.

[0009] A horizontal movable seat is movably sleeved on the two first slide rails, and the horizontal movable seat is movably clamped on the rear inner wall of the metal protective shell. The horizontal movable seat is threadedly connected to the threaded drive rod and can be moved by thread transmission. The front side of the horizontal movable seat is fixedly connected to a connecting block, and the connecting block extends to the front side of the metal protective shell and is fixedly connected to a mounting plate. The front side of the metal protective shell is provided with two sliding grooves that match the connecting block on the horizontal movable seat;

[0010] The mobile device also includes an extension plate, a second slide rail, a follower mounting platform and a push cylinder. Both ends of the upper side of the metal protective shell are fixedly connected to the extension plate. Two symmetrically distributed second slide rails are fixedly connected between the two extension plates. The second slide rails are movably sleeved with a follower mounting platform. The follower mounting platform is fixedly connected to a push cylinder. The driving end of the push cylinder is movably plugged into the upper end of the mounting plate.

[0011] The lifting device includes an L-shaped mounting platform, a lifting electric push rod and a compensation support rod. The lower end of the front side of the mounting plate is fixedly connected to two symmetrically distributed limit columns, and the L-shaped mounting platform is movably connected to the limit columns. The driving end of the pushing cylinder extends to the side of the mounting plate away from the metal protective shell and is fixedly connected to the upper end of the L-shaped mounting platform. Four lifting electric push rods are fixedly connected to the upper side of the horizontal end of the L-shaped mounting platform at an equidistant distribution. A compensation support rod is movably inserted at the center of the upper side of the horizontal end of the L-shaped mounting platform.

[0012] Preferably, the push rods of the four lifting electric push rods are movably plugged into the L-shaped mounting platform, and extend to the lower end of the L-shaped mounting platform and are fixedly connected to a metal mounting plate 1. The compensation strut is composed of three support columns distributed in parallel and equidistantly. The lower end of the compensation strut is movably plugged into the metal mounting plate 1 and extends to the lower end of the metal mounting plate 1 and is fixedly connected to an annular fixing seat. The bottoms of the three annular fixing seats are fixedly connected to the metal mounting plate 2.

[0013] Preferably, a buffer spring 1 is sleeved between the corresponding annular fixing seat and the metal mounting plate 1 on the side surfaces of the three support columns of the compensation strut, and buffer rods are fixedly connected at the four corners of the upper side surface of the metal mounting plate 2. Buffer pulling grooves are opened in the inner cavity of the metal mounting plate 1 just above the corresponding four buffer rods, and the tops of the four buffer rods are movably extended into the corresponding buffer pulling grooves and are fixedly connected with a limiting slider, and the limiting slider has the same cross-sectional shape as the buffer pulling groove, and the limiting slider can only make up and down translational movements in the buffer pulling groove, and the upper side surface of the metal mounting plate 2 is fixedly connected with a hydraulic pump, and the hydraulic pump is connected to the water-oil sealing detection device.

[0014] Preferably, the fluid reaction force offsetting device includes a follower connecting seat, a second sliding rod, a buffer spring 1, a reaction force compensation cylinder and an air pressure regulating air source, the first sliding rod is movably sleeved with a follower connecting seat, the follower connecting seat is in an inverted U shape, a third slide rail is fixedly connected between the inner walls on both sides of the follower connecting seat, a movable mounting plate is movably sleeved on the third slide rail, and buffer spring 2 is sleeved on both ends of the side surface of the third slide rail corresponding to the movable mounting plate, one end of the lower side surface of the movable mounting plate is fixedly connected to the reaction force compensation cylinder, and the other end of the lower side surface of the movable mounting plate is fixedly connected to the air pressure regulating air source.

[0015] Preferably, a flexible pressure block is fixedly connected to the bottom of the push rod of the reaction force compensation cylinder, a force sensor is fixedly connected to the lower side of the flexible pressure block, and the force sensor is fixedly installed on the top of the three compensation struts.

[0016] Preferably, the upper and lower ends of the reaction force compensation cylinder are fixedly connected to air pipes, the other ends of the two air pipes are connected to the air pressure regulating air source, the lower end air pipe is fixedly connected to a solenoid valve, and the upper end air pipe is fixedly connected to a pressure reducing valve.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides a lifting and positioning device for water and oil leak detection, which has the following beneficial effects:

[0019] 1. The lifting and positioning device for water and oil leak detection uses a force sensor to sense the magnitude and direction of the reaction force generated by the fluid on the cylinder interface in real time. The control system calculates the required compensation force based on this and controls the reaction force compensation cylinder to apply a compensation force equal to the reaction force in magnitude and opposite in direction, thereby effectively resisting the interference of the fluid reaction force and ensuring that the cylinder remains stable during the detection process.

[0020] 2. The movable mounting plate in the fluid reaction force offsetting device of the lifting and positioning device for water and oil leak detection is movably connected to the third slide rail, and there are buffer springs on both sides of the third slide rail to buffer the impact force of the cylinder movement, so as to ensure that the compensation force is applied smoothly; at the same time, the reaction force compensation cylinders are symmetrically arranged, which can effectively offset the fluid reaction force from multiple directions, avoid the displacement of the cylinder body due to the reaction force, ensure the precise positioning of the cylinder body, prevent the sealing tooling from being detached or misaligned from the cylinder body interface, avoid the phenomenon of "false leakage" or "false qualification", and ensure accurate product quality judgment.

[0021] 3. The lifting and positioning device for water and oil leak detection can effectively resist the interference of fluid reaction force, avoid displacement of the cylinder body, and reduce the uneven wear of the positioning device guide mechanism caused by long-term accumulated displacement deviation, thereby improving the repeatability of the positioning device. It enables subsequent detection to obtain accurate and reliable data, effectively solving the detection error problem caused by positioning deviation, eliminating the need for frequent manual calibration and equipment debugging on the production line, saving a lot of time and labor costs, and significantly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 Schematic diagram of the lifting device and the fixing plate of the detection device of the present invention;

[0024] Figure 3 is a schematic structural diagram of the mobile device of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the lifting device of the present invention;

[0026] Figure 5Schematic diagram of the metal mounting plate 1 and the metal mounting plate 2 of the present invention;

[0027] Figure 6 Schematic diagram of the limiting slider of the present invention;

[0028] Figure 7 This is a schematic diagram of the buffer pulling trough of the present invention;

[0029] Figure 8 is a schematic diagram of a fluid reaction force offsetting device according to the present invention;

[0030] Figure 9 It is a schematic diagram of the follower connecting seat of the present invention.

[0031] Figure: 1. Protective base; 2. Protective housing; 3. Moving device; 4. First slide bar; 5. Fluid reaction force compensation device; 6. Mounting plate; 7. Lifting device; 8. Detection device fixing plate; 9. Metal protective housing; 10. Translation drive motor; 11. First slide rail; 12. Threaded drive rod; 13. Horizontal moving seat; 14. Extension plate; 15. Second slide rail; 16. Follow-up mounting platform; 17. Push cylinder; 18. L-shaped mounting platform; 19. Lifting electric push rod; 20 , compensation support rod; 21. Metal mounting plate 1; 22. Annular fixing seat; 23. Metal mounting plate 2; 24. Buffer rod; 25. Limit slider; 26. Buffer pulling groove; 27. Follow-up connecting seat; 28. Second slide bar; 29. ​​Buffer spring 1; 30. Reaction force compensation cylinder; 31. Air pressure regulating air source; 32. Solenoid valve; 33. Pressure reducing valve; 34. Flexible pressure block; 35. Force sensor; 36. Third slide rail; 37. Buffer spring 2; 38. Movable mounting plate. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-9, a lifting and positioning device for water and oil leak detection, comprising a protective base 1 and a protective outer shell 2, the protective base 1 is fixed to the ground by bolts, the upper end of the protective base 1 is provided with a protective outer shell 2, and the rear ends of the inner walls of both sides of the protective outer shell 2 are provided with moving devices 3, the tops of the inner walls of both sides of the protective outer shell 2 are fixedly connected with two symmetrically arranged first sliding rods 4, the first sliding rods 4 are provided with a fluid reaction force offsetting device 5, a mounting plate 6 is provided on the front side of the moving device 3, a lifting device 7 is provided on the mounting plate 6, a detection device fixing plate 8 is provided at the lower end of the lifting device 7, a water and oil sealing detection device for detecting the engine cylinder block is provided at the bottom of the detection device fixing plate 8, the inner cavity of the protective base 1 is provided with a control system, and the protective base 1 is fixed to the ground by bolts to provide stable support for the entire device The foundation has a control system set in its inner cavity, which plays the role of bearing and protecting the control system, ensuring the stable operation of various components during the operation of the device, and avoiding the influence of factors such as ground vibration on the accuracy of the device. The protective outer shell 2 is set at the upper end of the protective base 1, which is used to protect the key components such as the moving device 3 and the fluid reaction force offsetting device 5 inside the device, and prevent external debris and dust from entering the interior of the device. At the same time, it provides a space frame for installation support for the internal components to ensure the normal operating environment of the device. The first slide bar 4 is fixedly connected to the top of the inner wall on both sides of the protective outer shell 2 and is symmetrically distributed, providing the fluid reaction force offsetting device 5 with installation and sliding track support, so that the fluid reaction force offsetting device 5 can be adjusted or moved along its direction to ensure the stability and guidance of the reaction force offsetting component during operation.

[0034] The moving device 3 includes a metal protective shell 9, a translation drive motor 10, a first slide rail 11, a threaded drive rod 12 and a horizontal moving seat 13. The metal protective shell 9 is fixedly connected to the inner walls of both sides of the protective shell body 2. The inner cavity of the metal protective shell 9 is hollow, and one end is fixedly connected to the translation drive motor 10. The two ends of the translation drive motor 10 away from the inner wall of the metal protective shell 9 are fixedly connected to the first slide rail 11. The other ends of the two first slide rails 11 are fixed to the inner wall of the metal protective shell 9. The threaded drive rod 12 is fixedly connected to the rotating shaft of the metal protective shell 9. The other end of the threaded drive rod 12 is rotatably connected to the inner wall of the metal protective shell 9. The metal protective shell 9 is fixedly connected On the inner walls on both sides of the protective outer shell 2, serving as the main frame of the moving device 3, the internal hollow space is used to install components such as the translation drive motor 10, the first slide rail 11, and the threaded drive rod 12, which protect the internal transmission components. At the same time, the sliding groove opened on its front side cooperates with the connecting block of the horizontal moving seat 13 to realize the stable movement and guidance of the horizontal moving seat 13. The translation drive motor 10 drives the threaded drive rod 12 to rotate through the rotating shaft to provide power for horizontal movement; the first slide rail 11 is used to limit the moving direction of the horizontal moving seat 13 to ensure that it slides smoothly along a straight line. The threaded drive rod 12: cooperates with the horizontal moving seat 13 threadably to convert the rotational motion of the motor into the linear motion of the horizontal moving seat 13.

[0035] A horizontally movable seat 13 is movably sleeved on the two first slide rails 11, and the horizontally movable seat 13 is movably clamped on the rear inner wall of the metal protective shell 9. The horizontally movable seat 13 is threadedly connected to the threaded drive rod 12 and can be moved by thread transmission. The front side of the horizontally movable seat 13 is fixedly connected to a connecting block, and the connecting block extends to the front side of the metal protective shell 9 and is fixedly connected to the mounting plate 6. The front side of the metal protective shell 9 is provided with two sliding grooves that match the connecting block on the horizontally movable seat 13. The sliding grooves provide a motion trajectory for the connecting block of the horizontally movable seat 13, ensuring the stability and guidance of the mounting plate 6 during movement.

[0036] Furthermore, the moving device 3 also includes an extension plate 14, a second slide rail 15, a follow-up mounting platform 16 and a pushing cylinder 17. The extension plates 14 are fixedly connected to both ends of the upper side of the metal protective shell 9, and two symmetrically distributed second slide rails 15 are fixedly connected between the two extension plates 14. The follow-up mounting platform 16 is movably sleeved on the second slide rail 15, and the follow-up mounting platform 16 is fixedly connected to the pushing cylinder 17. The driving end of the pushing cylinder 17 is movably inserted into the upper end of the mounting plate 6.

[0037] The lifting device 7 includes an L-shaped mounting platform 18, a lifting electric push rod 19 and a compensation support rod 20. The lower end of the front side of the mounting plate 6 is fixedly connected to two symmetrically distributed limit columns, and the L-shaped mounting platform 18 is movably connected to the limit column. The driving end of the push cylinder 17 extends to the side of the mounting plate 6 away from the metal protective shell 9 and is fixedly connected to the upper end of the L-shaped mounting platform 18. The upper side of the horizontal end of the L-shaped mounting platform 18 is fixedly connected to four lifting electric push rods 19 distributed at equal intervals. The compensation support rod 20 is movably inserted at the center of the upper side of the horizontal end of the L-shaped mounting platform 18. The extension plate 14 and the second slide rail 15 constitute a sliding track in the Y-axis direction to support the movement of the follow-up mounting platform 16; the push cylinder 17 drives the follow-up mounting platform 16 to slide on the second slide rail 15, thereby driving the mounting plate 6 to fine-tune along the Y-axis to achieve precise alignment of the detection device and the cylinder body. The L-shaped mounting platform 18 is movably connected to the mounting plate 6 through a limiting column, and the position adjustment of the lifting device is achieved under the action of the pushing cylinder 17; the lifting electric push rod 19, as the lifting power source, drives the metal mounting plate 1 21 to move vertically to achieve the lifting action of the detection device; the compensation support rod 20 assists in supporting the metal mounting plate 2 23 to provide buffering and stabilization.

[0038] The push rods of the four lifting electric push rods 19 are movably inserted into the L-shaped mounting platform 18, and extend to the lower end of the L-shaped mounting platform 18 and are fixedly connected to a metal mounting plate 21. The compensation support rod 20 is composed of three support columns that are parallel and equidistantly distributed. The lower end of the compensation support rod 20 is movably inserted into the metal mounting plate 21 and extends to the lower end of the metal mounting plate 21 and is fixedly connected to an annular fixing seat 22. The bottom of the three annular fixing seats 22 is fixedly connected to a metal mounting plate 23. The metal mounting plate 1 21 is fixed to the push rod of the lifting electric push rod 19. When moving downward, the metal mounting plate 23 is driven to descend synchronously through the annular fixing seat 22 to ensure that the detection device is docked with the cylinder body; the annular fixing seat 22 connects the metal mounting plate 1 21 and the metal mounting plate 2 23 to transmit the lifting power and keep the relative position of the two stable.

[0039] Furthermore, buffer springs 29 are sleeved between the corresponding annular fixing seats 22 and the metal mounting plate 1 21 on the side surfaces of the three supporting columns of the compensation strut 20, and buffer rods 24 are fixedly connected at the four corners of the upper side surface of the metal mounting plate 23. Buffer pulling grooves 26 are opened in the inner cavity of the metal mounting plate 1 21 just above the four buffer rods 24. The tops of the four buffer rods 24 are movably extended into the corresponding buffer pulling grooves 26 and are fixedly connected to a limiting slider 25. The limiting slider 25 has the same cross-sectional shape as the buffer pulling groove 26, and the limiting slider 25 can only move up and down in the buffer pulling groove 26. A hydraulic pump is fixedly connected to the upper side surface of the metal mounting plate 23, and the hydraulic pump is connected to the water-oil sealing detection device. The buffer rods 24 and the limiting slider 25 cooperate with the buffer pulling groove 26 to limit the movement range of the metal mounting plate 23 to avoid excessive displacement, and at the same time further buffer the impact through sliding friction; the hydraulic pump provides power for the water-oil sealing detection device to realize fluid pressurization and detection.

[0040] Furthermore, the fluid reaction force offsetting device 5 includes a follower connecting seat 27, a second slide bar 28, a buffer spring 29, a reaction force compensation cylinder 30 and an air pressure regulating air source 31. The follower connecting seat 27 is movably sleeved on the first slide bar 4. The follower connecting seat 27 is in an inverted U shape. A third slide rail 36 is fixedly connected between the inner walls of the two sides of the follower connecting seat 27. A movable mounting plate 38 is movably sleeved on the third slide rail 36. Buffer springs 237 are sleeved at both ends of the movable mounting plate 38 corresponding to the side surface of the third slide rail 36. One end of the lower side surface of the movable mounting plate 38 is fixedly connected to the reaction force compensation cylinder 30, and the other end of the lower side surface of the movable mounting plate 38 is fixedly connected to the air pressure regulating air source 31. The follower connecting seat 27 is sleeved on the first slide bar 4 through the second slide bar 28. On a slide rod 4, it can move laterally along the top of the device, driving the reaction force compensation cylinder 30 to adjust its position; the movable mounting plate 38 slides on the third slide rail 36, and cooperates with the buffer spring 2 37, so that the reaction force compensation cylinder 30 can flexibly adjust its position and buffer small movement impacts; the reaction force compensation cylinder 30 contacts the surface of the cylinder body through the flexible pressure block 34, and applies a compensation force to offset the fluid reaction force; the force sensor 35 is used to detect the size and direction of the reaction force in real time, and provide feedback signals for the control system to ensure that the compensation force is accurately matched; the bottom of the push rod of the reaction force compensation cylinder 30 is fixedly connected to the flexible pressure block 34, and the lower side of the flexible pressure block 34 is fixedly connected to the force sensor 35, and the force sensor 35 is fixedly installed on the top of the three compensation struts 20.

[0041] Furthermore, the upper and lower ends of the reaction force compensation cylinder 30 are fixedly connected to air pipes, the other ends of the two air pipes are connected to the air pressure regulating air source 31, the lower end air pipe is fixedly connected to a solenoid valve 32, and the upper end air pipe is fixedly connected to a pressure reducing valve 33. The solenoid valve 32 is used to control the on-off of the air circuit and adjust the extension and contraction action of the reaction force compensation cylinder 30; the pressure reducing valve 33 is used to adjust the air source pressure to ensure that the compensation force output by the cylinder is stable and controllable, and to avoid damage to the cylinder body due to excessive pressure.

[0042] Working principle: After the engine cylinder is transported to the working area of ​​the device, the translation drive motor 10 in the moving device is started, and its rotating shaft drives the threaded drive rod 12 to rotate. Since the horizontal moving seat 13 is connected to the threaded drive rod 12 by threaded transmission, under the action of the threaded transmission, the horizontal moving seat 13 moves along the direction of the first slide rail 11, and then drives the mounting plate 6 to perform translation in the X-axis direction through the connecting block, and moves the lifting device 7 and the detection device fixing plate 8 to the top of the cylinder to be tested. In this process, the control system can control the pushing cylinder 17 to work, so that the pushing cylinder 17 pushes the L-shaped mounting platform 18 and then adjusts the lifting device 7 and the detection device fixing plate 8 to perform Y-axis adjustment above the cylinder to be tested, so that the sealing detection device fixedly connected below the metal mounting plate 23 can be accurately inserted into the engine cylinder in subsequent operations.

[0043] Then, the four lifting electric push rods 19 in the lifting device are started synchronously, the push rods extend and drive the metal mounting plate 1 21 to move downward, the buffer rods 24 connected to the four buffer pulling grooves 26 of the metal mounting plate 1 21 drive the limit slider 25 to move downward, and the buffer rods 24 are pushed by the limit slider 25 to drive the metal mounting plate 2 23 to move downward synchronously with the metal mounting plate 1 21; when the sealing detection devices at the bottom of the metal mounting plate 2 23 are all inserted into the engine cylinder to be detected, because there is still a distance between the top of the inner wall of the buffer pulling groove 26 and the limit slider 25, The metal mounting plate 21 continues to move downward until the top of the limit slider 25 abuts against the top inner wall of the buffer pulling groove 26. In this process, the lower side of the metal mounting plate 21 is squeezed by multiple buffer springs 29 sleeved on the compensation support rod 20, which not only allows the metal mounting plate 21 to move downward more stably, but also causes the buffer spring 29 itself to undergo a certain contraction deformation. Combined with the distance between the lower side of the limit slider 25 and the bottom inner wall of the buffer pulling groove 26 at this time, a buffer space is reserved for the reaction force generated when the subsequent sealing detection device works.

[0044] During the flow detection process, when high-speed flowing water or oil generates a reaction force on the cylinder body interface, the force acts on the sealing detection device and is transmitted along the metal mounting plate 23 to the compensation strut 20. It is then transmitted upward through the compensation strut 20 to the force sensor 35 for detection. The force sensor 35 senses the magnitude and direction of the reaction force in real time and transmits the signal to the control system in the inner cavity of the protective base 1. After receiving the signal, the control system immediately calculates the required compensation force and issues a command to the solenoid valve 32 and pressure reducing valve 33 in the fluid reaction force compensation device. At this time, the gas output from the pressure regulating gas source 31 is adjusted to the appropriate pressure by the pressure reducing valve 33, and then the solenoid valve 32 controls the air circuit and gas flow direction, and enters the reaction force compensation cylinder 30. The push rod of the reaction-force compensation cylinder 30 extends under the action of gas pressure, pushing the flexible pressure block 34 into close contact with the cylinder surface and applying a compensation force equal in magnitude and opposite in direction to the fluid reaction force. During this process, the reaction-force compensation cylinder 30 is fixed to a movable mounting plate 38, which is flexibly mounted on a third slide rail 36. Buffer springs 37 on either side of the third slide rail 36 cushion the impact of the cylinder's movement, ensuring the smooth application of the compensation force. Furthermore, the sliding movement of the movable mounting plate 38 on the third slide rail 36 and the symmetrical arrangement of the reaction-force compensation cylinder 30 effectively offset the fluid reaction force from multiple directions, ensuring that the cylinder remains stable during testing, avoiding displacement caused by the reaction force and preventing "false leaks" or "false acceptances."

[0045] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lifting and positioning device for water and oil leak detection, comprising a protective base (1) and a protective outer shell (2), wherein the protective base (1) is fixed to the ground by bolts, and the upper end of the protective base (1) is provided with a protective outer shell (2), characterized in that: The rear ends of the inner walls on both sides of the protective outer shell (2) are provided with moving devices (3), the tops of the inner walls on both sides of the protective outer shell (2) are fixedly connected with two symmetrically arranged first sliding rods (4), the first sliding rods (4) are provided with fluid reaction force offsetting devices (5), the front side of the moving device (3) is provided with a mounting plate (6), the mounting plate (6) is provided with a lifting device (7), the lower end of the lifting device (7) is provided with a detection device fixing plate (8), the bottom of the detection device fixing plate (8) is provided with a water and oil sealing detection device for detecting the engine cylinder body, and the inner cavity of the protective base (1) is provided with a control system; The moving device (3) includes a metal protective shell (9), a translation drive motor (10), a first slide rail (11), a threaded drive rod (12) and a horizontal moving seat (13), the metal protective shell (9) is fixedly connected to the inner walls of both sides of the protective shell body (2), the inner cavity of the metal protective shell (9) is hollow, and one end is fixedly connected to the translation drive motor (10), the two ends of the translation drive motor (10) away from the inner wall of the metal protective shell (9) are fixedly connected to the first slide rail (11), the other ends of the two first slide rails (11) are fixed to the inner wall of the metal protective shell (9), the rotating shaft of the metal protective shell (9) is fixedly connected to the threaded drive rod (12), and the other end of the threaded drive rod (12) is rotatably connected to the inner wall of the metal protective shell (9); A horizontal movable seat (13) is movably sleeved on the two first slide rails (11), and the horizontal movable seat (13) is movably clamped on the rear inner wall of the metal protective shell (9). The horizontal movable seat (13) is threadedly connected to the threaded drive rod (12) and can be moved by thread transmission. The front side of the horizontal movable seat (13) is fixedly connected to a connecting block, and the connecting block extends to the front side of the metal protective shell (9) and is fixedly connected to a mounting plate (6). The front side of the metal protective shell (9) is provided with two sliding grooves that match the connecting block on the horizontal movable seat (13); The moving device (3) further comprises an extension plate (14), a second slide rail (15), a follower mounting platform (16) and a pushing cylinder (17), both ends of the upper side surface of the metal protective shell (9) are fixedly connected to the extension plate (14), two symmetrically distributed second slide rails (15) are fixedly connected between the two extension plates (14), the second slide rail (15) is movably sleeved with a follower mounting platform (16), the follower mounting platform (16) is fixedly connected to a pushing cylinder (17), and the driving end of the pushing cylinder (17) is movably plugged into the upper end of the mounting plate (6); The lifting device (7) includes an L-shaped mounting platform (18), a lifting electric push rod (19) and a compensation support rod (20), the lower end of the front side of the mounting plate (6) is fixedly connected to two symmetrically distributed limit columns, and the limit columns are movably connected to the L-shaped mounting platform (18), the driving end of the pushing cylinder (17) extends to the side of the mounting plate (6) away from the metal protective shell (9) and is fixedly connected to the upper end of the L-shaped mounting platform (18), the upper side of the horizontal end of the L-shaped mounting platform (18) is fixedly connected to four lifting electric push rods (19) distributed at equal intervals, and the center of the upper side of the horizontal end of the L-shaped mounting platform (18) is movably connected to the compensation support rod (20); The fluid reaction force offsetting device (5) includes a follower connecting seat (27), a second slide bar (28), a buffer spring (29), a reaction force compensation cylinder (30) and an air pressure regulating gas source (31), wherein the first slide bar (4) is movably connected to the follower connecting seat (27), the follower connecting seat (27) is in an inverted U shape, a third slide rail (36) is fixedly connected between the inner walls of both sides of the follower connecting seat (27), a movable mounting plate (38) is movably connected to the third slide rail (36), and buffer springs (37) are respectively connected to both ends of the movable mounting plate (38) on the side surface of the third slide rail (36), a reaction force compensation cylinder (30) is fixedly connected to one end of the lower side surface of the movable mounting plate (38), and an air pressure regulating gas source (31) is fixedly connected to the other end of the lower side surface of the movable mounting plate (38).

2. A lifting and positioning device for water and oil leak detection according to claim 1, characterized in that: The push rods of the four lifting electric push rods (19) are all movably plugged into the L-shaped mounting platform (18), and are fixedly connected to the metal mounting plate 1 (21) at the lower end extending to the L-shaped mounting platform (18). The compensation support rod (20) is composed of three support columns distributed in parallel and equidistantly. The lower end of the compensation support rod (20) is movably plugged into the metal mounting plate 1 (21) and is fixedly connected to the lower end of the metal mounting plate 1 (21) at an annular fixing seat (22). The bottoms of the three annular fixing seats (22) are fixedly connected to the metal mounting plate 2 (23).

3. The lifting and positioning device for water and oil leakage detection according to claim 2, characterized in that: A buffer spring (29) is sleeved between the corresponding annular fixing seat (22) and the metal mounting plate (21) on the side surfaces of the three supporting columns of the compensation support rod (20), and a buffer rod (24) is fixedly connected at the four corners of the upper side surface of the metal mounting plate (23). A buffer pulling groove (26) is opened in the inner cavity of the metal mounting plate (21) just above the four buffer rods (24). The tops of the four buffer rods (24) are movably extended into the corresponding buffer pulling groove (26) and are fixedly connected to a limiting slider (25). The limiting slider (25) has the same cross-sectional shape as the buffer pulling groove (26). The limiting slider (25) can only move up and down in the buffer pulling groove (26). A hydraulic pump is fixedly connected to the upper side surface of the metal mounting plate (23), and the hydraulic pump is connected to the water-oil sealing detection device.

4. The lifting and positioning device for water and oil leak detection according to claim 1, characterized in that: A flexible pressing block (34) is fixedly connected to the bottom of the push rod of the reaction force compensation cylinder (30), and a force sensor (35) is fixedly connected to the lower side of the flexible pressing block (34). The force sensor (35) is fixedly mounted on the top of the three compensation support rods (20).

5. The lifting and positioning device for water and oil leakage detection according to claim 1, characterized in that: The upper and lower ends of the reaction force compensation cylinder (30) are fixedly connected to air pipes, the other ends of the two air pipes are connected to the air pressure regulating air source (31), the lower air pipe is fixedly connected to a solenoid valve (32), and the upper air pipe is fixedly connected to a pressure reducing valve (33).

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