Hydro-pneumatic spring pressure maintaining test platform capable of mechanically limiting
By designing a mechanically limited pressure-holding test platform for oil-gas springs and replacing hydraulic limits with mechanical locking, the instability problem of oil-gas spring airtightness testing equipment was solved, the accuracy and ease of use of test results were achieved, and costs were reduced.
Patent Information
- Application Number
- CN202422915934.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-28
AI Technical Summary
In the existing technology, there is a lack of dedicated equipment for testing the air tightness of oil and gas springs, and the external loading force is unstable, resulting in inaccurate test results and complicated operation.
Design a mechanically limited hydraulic spring pressure holding test platform. Use mechanical locking instead of hydraulic limiting, apply pressure through a loading cylinder, and use half-shaft retaining sleeve and distance sleeve to achieve stepless adjustment to ensure stable loading force.
It achieves accuracy and ease of use in the airtightness test of oil-gas springs, avoids pressure loss in hydraulic systems, reduces costs, and expands the scope of application of the test.
Smart Images
Figure CN223650054U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic spring testing technology, specifically to a hydraulic spring pressure holding test platform with mechanical limit. Background Technology
[0002] Hydropneumatic non-split springs have ideal non-linear characteristics and are gradually becoming the alternative suspension system to traditional leaf springs in heavy-duty trucks such as mining trucks and special transport vehicles. Their application can enhance vehicle adaptability, improve the driving environment, and reduce driver fatigue. The performance of hydropneumatic suspension plays an important role in improving vehicle driving comfort.
[0003] Air tightness is an important performance indicator of gas springs. Poor air tightness will lead to gas leakage, which will affect the stiffness and damping effect of the spring, and thus affect the performance of the suspension system. To verify its air tightness reliability, long-term air tightness tests need to be carried out under different gas pressures and different strokes. At present, there is no dedicated experimental equipment available.
[0004] When designing an airtightness test, if an external loading method using a hydraulic cylinder is adopted, the airtightness of the oil-air spring is difficult to accurately measure due to factors such as the pressure drop of the external loading cylinder during a long loading process.
[0005] Therefore, ensuring the stability of external loading forces and the ease of use of the experimental setup are urgent technical problems that need to be solved.
[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content
[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a mechanically limited pressure-holding test platform for oil-gas springs that can avoid external pressure loss, ensure accurate test results, and is simple and easy to use.
[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a mechanically limited oil-gas spring pressure holding test platform, including a main frame, a loading cylinder, a top frame, a male half-shaft, a female half-shaft, and a half-shaft retaining sleeve;
[0009] The main frame includes a base plate, columns and a movable top cover. The movable top cover is adjustable and lockable and works in conjunction with the columns. Two diagonally opposite columns serve as adjustable columns. The lower middle part of the adjustable columns is provided with an external thread section and the upper middle part is a smooth rod section.
[0010] The outer ends of the male and female half-shafts are slidably engaged with the smooth rod sections of the two adjusting columns, and the opposite sides of the male and female half-shafts are connected to the top frame.
[0011] The loading cylinder is installed between the lower end of the top frame and the base plate. The loading cylinder drives the top frame and causes the male and female half shafts to rise and fall.
[0012] The upper end of the top frame and the movable top cover are used to install the oil-gas spring to be tested;
[0013] The half-shaft retainer is installed on the external threaded section of the adjusting column. The half-shaft retainer is threadedly engaged with the external threaded section and is used to drive the male and female half-shafts and drive the top frame to rise and fall along the smooth section of the adjusting column.
[0014] Based on the above, a distance sleeve is slidably fitted on the adjusting column at the upper end of the half-shaft retaining sleeve. The upper end of the half-shaft retaining sleeve abuts against the distance sleeve, and the top end of the distance sleeve abuts against the lower outer ends of the male and female half-shafts.
[0015] Based on the above, the movable cover plate has through holes that mate with the columns, each column has an external thread at its top, and a pair of top cover sleeves are installed on the external thread at the top of each column. The height of each through hole position of the movable cover plate is locked by a pair of top cover sleeves.
[0016] Based on the above, the bottom end of the loading cylinder is detachably fixed to the base plate by fastening screws.
[0017] Based on the above, the top end of the loading cylinder is mounted on the top frame via a detachable pin.
[0018] Based on the above, the bottom end of the column is welded and fixed to the base plate.
[0019] Based on the above, the bottom end of the gas spring is connected to the top frame via two half-shafts.
[0020] Based on the above, the top end of the gas spring is connected to the movable top cover via a pin.
[0021] Based on the above, a lifting ring is provided at the top of the movable top cover.
[0022] Based on the above, at least one tooling hole is provided in the horizontal direction of the top cover sleeve and the half shaft sleeve.
[0023] This utility model has substantial features and advancements compared to existing technologies. Specifically, this utility model provides a dedicated platform for pressure holding tests of gas springs. After the loading cylinder provides the set pressure and stroke, the male half-shaft, female half-shaft, and top frame are locked by adjusting the half-shaft sleeve. Mechanical locking replaces the locking of the loading cylinder, thereby avoiding pressure loss during the hydraulic limit pressure holding process and the high cost of equipping a highly stable hydraulic system, and ensuring the accuracy of the pressure holding test results.
[0024] Furthermore, the test platform is a purely mechanical structure, and the raw materials used to manufacture the platform are common specifications and materials in the machinery industry. The production process only involves the most basic machining and welding processes, which has low barriers to entry, low cost, and strong operability.
[0025] Furthermore, the height of the two half-shaft retaining sleeves can be infinitely adjusted within a certain range on the column, thereby enabling the gas spring to perform a pressure holding test at any compression stroke.
[0026] Furthermore, due to the influence of environmental and other factors, internal lateral forces will inevitably be generated during the test. The distance sleeve can keep the contact surface between the hinge holes of the two half shafts and the column as a smooth plane rather than a threaded surface, thereby reducing contact damage to the threads in the lower part of the column.
[0027] Furthermore, the top cover sleeve is arranged above and below the top cover and is connected to the column through internal threads. It can achieve stepless adjustment of the position of the top cover by rotating itself, thereby enabling the pressure test platform to meet the pressure holding test conditions of oil and gas springs of different specifications and strokes.
[0028] Furthermore, the top cover and top frame can be easily redesigned and replaced according to the connection structure of the oil-gas spring being tested, thereby expanding the application range of the test platform. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the mechanically limited pressure-holding test platform for oil-gas springs in this utility model.
[0030] Figure 2 This is a three-dimensional view of the hydraulic spring pressure holding test platform with mechanical limiting in this utility model.
[0031] Figure 3 This is a schematic diagram of the structure of the adjusting column in this utility model.
[0032] Figure 4 This is a schematic diagram of the structure of other columns in this utility model.
[0033] In the diagram: 1. Main frame; 2. Loading cylinder; 3. Top frame; 4. Male half-shaft; 5. Female half-shaft; 6. Half-shaft retaining sleeve; 7. Gas spring; 8. Distance sleeve; 9. Top cover retaining sleeve; 10. Lifting ring; 11. Base plate; 12. Movable top cover; 13. Column; 14. Hinge shaft; 21. Fastening screw; 22. Pin; 23. Washer; 24. Cotter pin; 131. Adjusting column; 132. Lower middle part; 133. Upper middle part; 134. Top. Detailed Implementation
[0034] The technical solution of this utility model will be further described in detail below through specific embodiments.
[0035] like Figures 1-4 As shown, a mechanically limited pressure-holding test platform for a gas spring includes a main frame 1, a loading cylinder 2, a top frame 3, a male half-shaft 4, a female half-shaft 5, and a half-shaft retaining sleeve 6.
[0036] The main frame 1 includes a base plate 11, columns 13, and a movable top cover 12. The bottom end of the column 13 is welded and fixed to the base plate 11. The movable top cover 12 is adjustable and lockable to cooperate with the column 13. Two diagonally opposite columns serve as adjusting columns 131. The lower middle part 132 of the adjusting column 131 is provided with an external thread section, the upper middle part 133 is a smooth rod section, and the top end 134 is externally threaded. The top ends 134 of the other two columns 13 are also externally threaded.
[0037] The outer ends of the male half-shaft 4 and the female half-shaft 5 are respectively slidably engaged with the upper middle part 133 of the two adjusting columns. The opposite sides of the male half-shaft 4 and the female half-shaft 5 are connected to the top frame for installing the oil-gas spring 7 to be tested.
[0038] There are two types of half-shafts: one with an external thread on the rod end and the other with an internal thread on the rod end. The two can be connected together.
[0039] The lower end of the top frame 3 is used to install the loading cylinder 2 between the bottom plate 11 and the top frame 3. The loading cylinder 2 drives the top frame 3 and drives the male half shaft 4 and the female half shaft 5 to rise and fall. Specifically, the bottom end of the loading cylinder 2 is detachably fixed to the bottom plate 11 by fastening screws 21, and the top end of the loading cylinder 2 is installed on the top frame 3 by a detachable pin 22 in conjunction with a washer 23 and a cotter pin 24.
[0040] The upper end of the top frame 3 is used to install the oil-gas spring 7 to be tested between the upper end and the movable top cover 12. Specifically, the bottom end of the oil-gas spring 7 is connected to the top frame 3 through two half shafts, and the top end of the oil-gas spring 7 is connected to the movable top cover 12 through a hinge shaft 14.
[0041] The half-shaft retainer 6 is installed on the external threaded section of the lower middle part 132 of the adjusting column 131. The half-shaft retainer 6 is threadedly engaged with the external threaded section. A distance sleeve 8 is slidably fitted on the adjusting column 131 at the upper end of the half-shaft retainer 6. The upper end of the half-shaft retainer 6 abuts against the distance sleeve 8. The top end of the distance sleeve 8 abuts against the lower outer ends of the male half-shaft 4 and the female half-shaft 5. Tightening the half-shaft retainer 6 drives the male half-shaft 4 and the female half-shaft 5 through the distance sleeve 8, and drives the top frame 3 to rise and fall along the smooth rod section of the adjusting column 131. The distance sleeve 8 can keep the contact surface between the hinge holes of the two half-shafts and the column a smooth plane rather than a threaded surface, thereby reducing contact damage to the threads in the lower middle part of the column.
[0042] The movable cover plate 12 has through holes that mate with the columns. A pair of top cover sleeves 9 are installed on the external threads at the top of each column. The height of each through hole position of the movable cover plate 12 is locked by a pair of top cover sleeves 9. A lifting ring 10 is provided at the top of the movable top cover 12. At least one tooling hole is opened in the horizontal direction of the top cover sleeve 9 and the half shaft sleeve 6. In this embodiment, one is opened every 90° for use during rotation.
[0043] Working principle:
[0044] First, use fastening screws 21 to fix the loading cylinder 2 to the main frame base plate 11, while keeping the piston rod of the loading cylinder 2 fully retracted.
[0045] Then, the half-shaft retaining sleeve 6 and the distance sleeve 8 are successively fitted onto the adjusting column 131, and then the top frame 3, male half-shaft 4, female half-shaft 5, the tested oil-gas spring 7, the hinge shaft 14, and the top cover 12 are pressed together. Figure 1 Assemble the components as shown in the diagram, then hoist the assembly structure so that the male half-shaft 4 and female half-shaft 5 are fitted into the adjusting column 131, and the four holes of the top cover 12 are fitted into the tops of the four columns.
[0046] Adjust each component to a suitable position, use the loading cylinder 2 to load the air spring 7 to a certain position and pressure, adjust the half shaft retaining sleeve 6 upward so that the upper end face of the distance sleeve 8 is in close contact with the lower end face of the male half shaft 4 and the female half shaft 5; finally, depressurize the loading cylinder 2 and start the pressure holding test of the air spring 7.
[0047] The entire installation and adjustment process is simple and efficient, with stable mechanical limits and no system pressure loss, thus ensuring the accuracy of the test results.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.
Claims
1. A mechanically limited pressure-holding test platform for a gas spring, characterized in that: Includes main frame, loading cylinder, top frame, male half shaft, female half shaft and half shaft retaining sleeve; The main frame includes a base plate, columns and a movable top cover. The movable top cover is adjustable and lockable and works in conjunction with the columns. Two diagonally opposite columns serve as adjustable columns. The lower middle part of the adjustable columns is provided with an external thread section and the upper middle part is a smooth rod section. The outer ends of the male and female half-shafts are slidably engaged with the smooth rod sections of the two adjusting columns, and the opposite sides of the male and female half-shafts are connected to the top frame. The loading cylinder is installed between the lower end of the top frame and the base plate. The loading cylinder drives the top frame and causes the male and female half shafts to rise and fall. The upper end of the top frame and the movable top cover are used to install the oil-gas spring to be tested; The half-shaft retainer is installed on the external threaded section of the adjusting column. The half-shaft retainer is threadedly engaged with the external threaded section and is used to drive the male and female half-shafts and drive the top frame to rise and fall along the smooth section of the adjusting column.
2. The mechanically limited pressure-holding test platform for a gas spring according to claim 1, characterized in that: A distance sleeve is slidably fitted on the adjusting column at the upper end of the half-shaft retainer. The upper end of the half-shaft retainer abuts against the distance sleeve, and the top end of the distance sleeve abuts against the lower outer ends of the male and female half-shafts.
3. The mechanically limited pressure-holding test platform for a gas spring according to claim 2, characterized in that: The movable top cover has through holes that mate with the columns. Each column has an external thread on its top. A pair of top cover retainers are installed on the external thread on the top of each column. The height of each through hole position of the movable top cover is locked by a pair of top cover retainers.
4. The mechanically limited pressure-holding test platform for a gas spring according to claim 3, characterized in that: The bottom end of the loading cylinder is detachably fixed to the base plate by fastening screws.
5. The mechanically limited pressure-holding test platform for a gas spring according to claim 4, characterized in that: The top of the loading cylinder is mounted on the top frame via a detachable pin.
6. The mechanically limited pressure-holding test platform for a gas spring according to claim 5, characterized in that: The bottom end of the column is welded and fixed to the base plate.
7. The mechanically limited pressure-holding test platform for a gas spring according to claim 6, characterized in that: The bottom end of the gas spring is connected to the top frame via two half-shafts.
8. The mechanically limited pressure-holding test platform for a gas spring according to claim 7, characterized in that: The top end of the gas spring is connected to the movable top cover via a pin.
9. The mechanically limited pressure-holding test platform for a gas spring according to claim 8, characterized in that: A lifting ring is provided at the top of the movable top cover.
10. The mechanically limited pressure-holding test platform for a gas spring according to claim 9, characterized in that: At least one tooling hole is provided in the horizontal direction of the top cover sleeve and the half shaft sleeve.