Device for testing performance of nitride layer on inner surface of cylinder barrel of titanium alloy hydraulic cylinder
By designing a testing device that includes a fixed base, a drive rod, and a pressure sensor, the problems of cumbersome operation and inaccurate pressure adjustment of traditional testing devices are solved, enabling efficient and accurate nitrided layer performance testing and supporting cylinder life assessment.
Patent Information
- Application Number
- CN202610087201.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-22
- Publication Date
- 2026-02-27
AI Technical Summary
Traditional titanium alloy hydraulic cylinder inner surface nitriding layer performance testing devices are cumbersome to operate, time-consuming, and have inaccurate pressure regulation, making it difficult to achieve accurate wear resistance testing under high pressure conditions.
A testing device was designed, comprising a fixed base, a drive rod, a moving block, a pressure sensor, and a spring. It achieves multiple sets of variable tests by driving a reciprocating thread with a drive motor, and combines thread rod adjustment and ball bearings to reduce friction, monitors pressure in real time, and simulates different working conditions.
It enables simultaneous testing of multiple sets of variables, shortens the cycle, improves data accuracy, and can obtain nitrided layer wear data under different friction cycles and constant pressure, supporting the evaluation of wear resistance and prediction of cylinder life.
Smart Images
Figure CN121577475A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hydraulic cylinder testing technology, specifically to a device for testing the performance of the nitride layer on the inner surface of a titanium alloy hydraulic cylinder barrel. Background Technology
[0002] Titanium alloy hydraulic cylinders are widely used in engineering machinery, aerospace and other fields due to their lightweight and high strength characteristics. The nitrided layer on the inner surface of the cylinder barrel is the core structure for improving wear resistance and extending service life. Under high pressure reciprocating conditions, the nitrided layer needs to withstand continuous friction from the piston seals. The degree of wear directly determines the sealing reliability and service life of the hydraulic cylinder. Therefore, the wear resistance test of the nitrided layer is a key step before the product leaves the factory.
[0003] Traditional devices are mostly single-group friction structures, requiring multiple disassembly and reassembly to analyze different friction cycles. In contrast, the actual pressure of multiple pressure friction structures also needs to be adjusted separately, which is cumbersome, time-consuming, and prone to large data deviations due to environmental differences, making it difficult to quantify accurately. Moreover, most pressure adjustments rely on rigid pressure application, which lacks buffering and is prone to fluctuations. Furthermore, most of them lack real-time monitoring, making it difficult to match actual high-pressure working conditions and prone to misjudgment. Therefore, it is necessary to propose a device for testing the performance of the nitrided layer on the inner surface of the titanium alloy hydraulic cylinder barrel. Summary of the Invention
[0004] To address the problems in the prior art, this invention provides a device for testing the performance of the nitrided layer on the inner surface of a titanium alloy hydraulic cylinder barrel.
[0005] The technical solution adopted by this invention to solve its technical problem is: a device for testing the performance of the nitrided layer on the inner surface of a titanium alloy hydraulic cylinder, comprising a fixed base, three movable slots on the lower surface of the fixed base, a drive rod rotatably connected to the movable slots via bearings, the drive rod extending outside the fixed base and fixedly connected to a drive assembly, a reciprocating thread on the rod wall of the drive rod located in the three movable slots and threadedly connected to a movable block, a fixed plate fixedly connected to the movable block, a through hole on the fixed plate, and a pressing device fixedly connected to the fixed plate via a positioning assembly. The block has a placement groove on its lower pressing block, in which a pressure sensor is fixedly installed. A ball bearing groove is formed on the upper surface of the lower pressing block, in which a ball bearing is rotatably connected. A storage groove is formed on the lower surface of the fixed base, and a threaded hole is formed through the upper wall of the storage groove. A threaded rod is threaded into the threaded hole, and the lower end of the threaded rod extends into the storage groove and is rotatably connected to a mounting plate via a bearing. A spring is fixedly connected to the lower surface of the mounting plate, and a lower pressing plate is fixedly connected to the lower end of the spring. Limiting components are provided between the mounting plate and the lower pressing plate.
[0006] Specifically, the drive assembly includes a mounting bracket, which is fixedly connected to the outer wall of the fixed base. A drive motor is fixedly mounted on the mounting bracket, and the output end of the drive motor is fixedly connected to the drive rod via a coupling.
[0007] Specifically, the positioning component includes a positioning hole that is formed through the fixed plate. A positioning rod is slidably connected inside the positioning hole. The upper end of the positioning rod is fixedly connected to the lower pressure block, and the lower end of the positioning rod is fixedly connected to the positioning block.
[0008] Specifically, the limiting component includes a T-shaped hole through which a mounting plate is provided, a T-shaped rod is slidably connected within the T-shaped hole, the lower end of the T-shaped rod is fixedly connected to the upper surface of the lower pressure plate, and a spring is sleeved on the wall of the T-shaped rod.
[0009] Specifically, the upper end of the threaded rod extends outside the fixed seat, and a rotating handle is fixedly connected to the end of the threaded rod located outside the fixed seat.
[0010] Specifically, the diameters of the three moving slots are cm, cm and cm respectively, and the reciprocating thread on the drive rod wall matches the diameter length of the three moving slots.
[0011] Specifically, the lower surface of the pressure plate abuts against the upper end of the ball.
[0012] Specifically, the mounting plate is slidably connected within the storage slot.
[0013] The beneficial effects of this invention are as follows: The device for testing the performance of the nitrided layer on the inner surface of a titanium alloy hydraulic cylinder barrel, as described in this invention, uses a drive motor to drive a drive rod with a reciprocating thread, enabling three sets of moving blocks to achieve one, two, or three different reciprocating friction cycles at the same rotation speed. This allows for simultaneous testing of multiple variables without the need for repeated disassembly and assembly, significantly shortening the cycle time and providing intuitive data comparison. In terms of pressure control, the threaded rod adjusts the height of the mounting plate, and the spring transmits pressure to the pressure plate, flexibly simulating normal loads under different working conditions. During downward pressure, all three sets of friction components are simultaneously pressed down, and the rolling balls reduce movement resistance. Furthermore, the pressure sensor monitors the pressure of the carbide rod on the nitrided layer in real time, ensuring constant friction pressure and improving data accuracy. Overall, the device can acquire nitrided layer wear data under different friction cycles and constant pressure, providing strong support for evaluating wear resistance, predicting cylinder barrel life, and optimizing the nitriding process. Attached Figure Description
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Figure 1 A front view schematic diagram of a device for testing the performance of the nitride layer on the inner surface of a titanium alloy hydraulic cylinder barrel, provided by the present invention; Figure 2 A bottom view of the structure of a device for testing the performance of the nitride layer on the inner surface of a titanium alloy hydraulic cylinder barrel, provided by the present invention. Figure 3 A schematic diagram of the low-pressure synchronous detection state structure of a device for testing the performance of the nitride layer on the inner surface of a titanium alloy hydraulic cylinder barrel, provided by the present invention. Figure 4 A schematic diagram of the pressure regulation synchronous detection state structure of a device for testing the performance of the nitride layer on the inner surface of a titanium alloy hydraulic cylinder barrel, provided by the present invention. Figure 5 Internal cross-sectional view of the mounting plate and the lower pressure plate of the device for testing the performance of the nitrided layer on the inner surface of the cylinder barrel of a titanium alloy hydraulic cylinder provided by the present invention; Figure 6 This invention provides an internal cross-sectional view of the fixing plate and the lower pressure block of a device for testing the performance of the nitrided layer on the inner surface of a titanium alloy hydraulic cylinder barrel.
[0016] In the diagram: 1. Fixed base; 2. Moving slot; 3. Drive rod; 4. Rotating handle; 5. Moving block; 6. Fixed plate; 7. Placement hole; 8. Lower pressure block; 9. Placement slot; 10. Pressure sensor; 11. Ball groove; 12. Ball; 13. Storage slot; 14. Threaded hole; 15. Threaded rod; 16. Mounting plate; 17. Spring; 18. Lower pressure plate; 19. Mounting bracket; 20. Drive motor; 21. Positioning hole; 22. Positioning rod; 23. Positioning block; 24. T-hole; 25. T-rod. Detailed Implementation
[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0018] like Figures 1-6 As shown, the present invention provides the following technical solution: Example 1: A device for testing the performance of the nitrided layer on the inner surface of a titanium alloy hydraulic cylinder barrel, comprising a fixed base 1, three movable grooves 2 formed on the lower surface of the fixed base 1, a drive rod 3 rotatably connected to each movable groove 2 via bearings, the drive rod 3 extending outside the fixed base 1 and fixedly connected to a drive assembly, the drive rod 3 having reciprocating threads on its rod wall within the three movable grooves 2 and being threadedly connected to a movable block 5, a fixed plate 6 fixedly connected to the movable block 5, a placement hole 7 formed through the fixed plate 6, a lower pressure block 8 fixedly connected to the fixed plate 6 via a positioning assembly, the lower pressure block 8 having a placement groove 9, and the placement... A pressure sensor 10 is fixedly installed in the slot 9. A ball groove 11 is formed on the upper surface of the lower pressure block 8. A ball 12 is rolled in the ball groove 11. A storage slot 13 is formed on the lower surface of the fixed seat 1. A threaded hole 14 is formed through the upper wall of the storage slot 13. A threaded rod 15 is threaded in the threaded hole 14. The lower end of the threaded rod 15 extends into the storage slot 13 and is rotatably connected to a mounting plate 16 through a bearing. A spring 17 is fixedly connected to the lower surface of the mounting plate 16. A lower pressure plate 18 is fixedly connected to the lower end of the spring 17. Limiting components are provided on the mounting plate 16 and the lower pressure plate 18. The drive assembly includes a mounting bracket 19, which is fixedly connected to the outer side wall of the fixed base 1. A drive motor 20 is fixedly mounted on the mounting bracket 19, and the output end of the drive motor 20 is fixedly connected to the drive rod 3 through a coupling. The positioning component includes a positioning hole 21, which is formed through the fixing plate 6. A positioning rod 22 is slidably connected inside the positioning hole 21. The upper end of the positioning rod 22 is fixedly connected to the lower pressure block 8, and the lower end of the positioning rod 22 is fixedly connected to the positioning block 23. The limiting component includes a T-shaped hole 24, through which a mounting plate 16 is provided. A T-shaped rod 25 is slidably connected inside the T-shaped hole 24. The lower end of the T-shaped rod 25 is fixedly connected to the upper surface of the lower pressure plate 18. The spring 17 is sleeved on the rod wall of the T-shaped rod 25. When using it, the following steps are included: First, clamp and fix the cylinder of the titanium alloy hydraulic cylinder, then install the fixing seat 1 on the guide rail equipment. Then, insert the hard alloy rod for testing into the placement hole 7 and the placement groove 9, so that the hard alloy rod abuts against the pressure sensor 10 and lifts the lower pressure block 8. The lower end of the hard alloy rod is flush with the inner surface of the cylinder of the titanium alloy hydraulic cylinder. Then, push the fixing seat 1 into the cylinder of the titanium alloy hydraulic cylinder and fix its position. The second step is to start the drive motor 20, which drives the drive rod 3 to rotate. The drive rod 3 drives the moving block 5 to move back and forth through the reciprocating screw. Because the distance between the moving slot 2 and the reciprocating screw is not the same, the three sets of moving blocks 5 move back and forth once in the same number of turns of the drive rod 3. The moving block 5 in the 16cm moving slot 2 moves back and forth twice, the moving block 5 in the 12cm moving slot 2 moves back and forth three times. The third step involves keeping the mounting plate 16 and the lower pressure plate 18 within the storage groove 13. The lower pressure block 8 presses down on the carbide rod, causing it to press down and come into contact with the nitrided layer on the inner surface of the titanium alloy hydraulic cylinder under its own weight and that of the lower pressure block 8. The moving block 5 moves the fixed plate 6 synchronously, and the fixed plate 6 moves the lower pressure block 8 synchronously via the positioning rod 22. This causes the fixed plate 6 and the lower pressure block 8 to move the carbide rod back and forth synchronously, rubbing the carbide rod against the nitrided layer on the inner surface of the titanium alloy hydraulic cylinder. The three sets of carbide rods undergo different numbers of friction tests under the same pressure and speed. Fourth step: Rotate the threaded rod 15 by turning the handle 4. The threaded rod 15 rotates and descends in the threaded hole 14. The threaded rod 15 pushes the mounting plate 16 down in the receiving groove 3. The mounting plate 16 pushes the lower pressure plate 18 down through the spring 17 until the lower pressure plate 18 abuts against the ball 12. The ball 12 supports the lower pressure plate 18. As the mounting plate 16 continues to descend, the mounting plate 16 pushes the lower pressure plate 18 through the spring 17. The lower pressure plate 18 pushes the lower pressure block 8 simultaneously through the ball 12. The lower pressure block 8 presses down on the carbide rod to abut against the nitrided layer on the inner surface of the titanium alloy hydraulic cylinder. The pressure sensor 10 detects the pressure on the carbide rod to confirm the pressure of the carbide rod during friction. Fifth, the drive motor 20 is started to drive the carbide rod to reciprocate, while the lower pressure block 8 rolls on the lower surface of the lower pressure plate 18 through the ball bearings 12, so that the lower pressure plate 18 maintains the pressure on the lower pressure block 8 during its movement, thereby maintaining the pressure on the carbide rod during its movement. After the pressure is adjusted at the same time, the three sets of carbide rods are still subjected to friction of different numbers of times under the same pressure and speed. Then, the nitrided layer on the inner surface of the titanium alloy hydraulic cylinder barrel is tested, thus completing the effect of different friction times on the nitrided layer on the inner surface of the titanium alloy hydraulic cylinder barrel.
[0019] Example 2: The technical solutions in this example that differ from Example 1 include: The upper end of the threaded rod 15 extends outside the fixed base 1, and a rotating handle 4 is fixedly connected to the end of the threaded rod 15 outside the fixed base 1. The threaded rod 15 can be rotated by rotating the handle 4, making the rotation of the threaded rod 15 more convenient. The diameters of the three moving slots 2 are 8cm, 12cm and 16cm respectively, and the reciprocating thread on the wall of the drive rod 3 matches the diameter length of the three moving slots 2. Through the limiting of the moving slots 2 and the reciprocating thread, the moving block 5 can only move within the moving slots 2. The lower pressure plate 18 moves back and forth at distances of m, 8cm, and 12cm. The lower surface of the lower pressure plate 18 abuts against the upper end of the ball bearing 12. The lower pressure block 8 rolls on the lower surface of the lower pressure plate 18 via the ball bearing 12. The lower pressure plate 18 maintains downward pressure on the ball bearing 12 and the lower pressure block 8 via the ball bearing 12. The mounting plate 16 is slidably connected in the storage groove 13, so that the mounting plate 16 can only move vertically within the storage groove 13. The mounting plate 16 limits the lower pressure plate 18 through the limiting component, so that the lower pressure plate 18 can also only move vertically.
[0020] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A device for testing the performance of a nitrided layer on the inner surface of a titanium alloy hydraulic cylinder barrel, comprising a fixing seat (1), characterized in that, The lower surface of the fixed seat (1) is provided with three moving grooves (2), a driving rod (3) is rotatably connected in the moving groove (2) through a bearing, the driving rod (3) extends out of the fixed seat (1) and is fixedly connected with a driving assembly, a reciprocating thread is arranged on the rod wall of the driving rod (3) in the three moving grooves (2), and a moving block (5) is threadedly connected with the reciprocating thread, the moving block (5) is fixedly connected with a fixed plate (6), a placing hole (7) is penetratingly arranged on the fixed plate (6), the fixed plate (6) is fixedly connected with a lower pressing block (8) through a positioning assembly, a placing groove (9) is arranged on the lower pressing block (8), a pressure sensor (10) is fixedly installed in the placing groove (9), a ball groove (11) is arranged on the upper surface of the lower pressing block (8), a ball (12) is rotatably connected in the ball groove (11), a receiving groove (13) is arranged on the lower surface of the fixed seat (1), a threaded hole (14) is penetratingly arranged on the upper end groove wall of the receiving groove (13), a threaded rod (15) is threadedly connected in the threaded hole (14), the lower end of the threaded rod (15) extends into the receiving groove (13) and is rotatably connected with a mounting plate (16) through a bearing, the lower surface of the mounting plate (16) is fixedly connected with a spring (17), the lower end of the spring (17) is fixedly connected with a lower pressing plate (18), and the mounting plate (16) and the lower pressing plate (18) are provided with a limiting assembly.
2. The device for testing the performance of the nitriding layer on the inner surface of a titanium alloy hydraulic cylinder barrel according to claim 1, characterized in that: The driving assembly comprises a mounting frame (19), the mounting frame (19) is fixedly connected to the outer side wall of the fixed seat (1), and a driving motor (20) is fixedly installed on the mounting frame (19).
3. The device for testing the performance of the nitriding layer on the inner surface of the cylinder barrel of a titanium alloy hydraulic cylinder of claim 1, characterized in that: The positioning assembly comprises a positioning hole (21), the positioning hole (21) is penetratingly arranged on the fixed plate (6), a positioning rod (22) is slidably connected in the positioning hole (21), the upper end of the positioning rod (22) is fixedly connected with the lower pressing block (8), and the lower end of the positioning rod (22) is fixedly connected with a positioning block (23).
4. The device for testing the performance of the nitriding layer on the inner surface of a titanium alloy hydraulic cylinder barrel according to claim 1, characterized in that: The limiting assembly comprises a T-shaped hole (24), the T-shaped hole (24) is penetratingly arranged on the mounting plate (16), a T-shaped rod (25) is slidably connected in the T-shaped hole (24), the lower end of the T-shaped rod (25) is fixedly connected with the upper surface of the lower pressing plate (18), and the spring (17) is sleeved on the rod wall of the T-shaped rod (25).
5. The device for testing the performance of the nitriding layer on the inner surface of a titanium alloy hydraulic cylinder barrel according to claim 1, characterized in that: The upper end of the threaded rod (15) extends out of the fixed seat (1), and a rotating handle (4) is fixedly connected to one end of the threaded rod (15) outside the fixed seat (1).
6. The device for testing the performance of the nitriding layer on the inner surface of a titanium alloy hydraulic cylinder barrel according to claim 1, characterized in that: The diameters of the three moving grooves (2) are 8cm, 12cm and 16cm respectively, and the reciprocating thread on the rod wall of the driving rod (3) matches the diameter length of the three moving grooves (2).
7. The device for testing the performance of the nitriding layer on the inner surface of a titanium alloy hydraulic cylinder barrel according to claim 1, characterized in that: The lower surface of the lower pressing plate (18) abuts against the upper end of the ball (12).
8. The device for testing the performance of the nitriding layer on the inner surface of a titanium alloy hydraulic cylinder barrel according to claim 1, characterized in that: The mounting plate (16) is slidably connected in the receiving groove (13).