A high temperature friction testing device for hydraulic spool valves

Abstract

The application discloses a high-temperature friction testing device for a hydraulic slide valve. The device is composed of a valve core clamping module, a valve body mounting module, a vertical force applying module, a high-temperature heating module and a friction force applying module. The valve core clamping module is composed of a valve core, a valve core centering fixing column, a valve core fixing clamp, a valve core mounting rod and a mounting rod fixing shell. The valve body mounting module is composed of an oil storage tank, an oil storage tank fixing plate and a valve body. The vertical force applying module includes X, Y and Z three-axis guide rails driven by a motor, and pressure and friction force sensors. The high-temperature heating module surrounds the valve body and the valve core mounting part. The friction force applying module is driven by a motor to drive the oil storage tank to realize the axial movement of the valve body and the relative friction between the valve core and the valve body. The device can conduct the friction test of the hydraulic slide valve under different temperatures, realize the friction and wear simulation of the hydraulic slide valve under the working conditions of oil environment, high temperature and pollution and the like, and provide data support for the wear and degradation test of the hydraulic slide valve.

Description

Technical Field

[0001] This invention relates to the field of friction and wear testing, and more particularly to a high-temperature friction testing device for hydraulic slide valves. Background Technology

[0002] Friction is a crucial factor affecting the precision of moving parts, component lifespan, and equipment reliability. The working principle of a hydraulic spool valve is to control the relative movement of the valve core within the valve body, thereby controlling the valve opening and ultimately controlling the system's flow rate, pressure, and direction. Therefore, the valve core-valve body pair is one of the most important friction pairs in a hydraulic spool valve. Its surface roughness, clearance, and wear resistance directly affect the valve's performance, causing changes in internal leakage, flow curves, and control precision. During actual valve use, factors such as temperature and oil contamination levels can influence the wear mechanism of the valve core-valve body friction pair, altering the rate of frictional degradation.

[0003] Traditional spool valve friction testing typically involves pin-disc tests on commercially available friction and wear testing machines. This type of testing can only study the wear and degradation patterns at the material level and cannot reflect the actual wear between the cylindrical valve core and valve body. While some friction and wear testing devices specifically designed for spool valve structures generally only perform friction tests at room temperature, the limited operating conditions cannot replicate the complex environments of real-world hydraulic valve applications. The friction and wear of actual hydraulic spool valves are affected by various factors such as temperature and contaminants. For example, the operating environment temperature of hydraulic servo valves used in aero-engine fuel cells can reach 300 degrees Celsius; the harsh working environments of construction machinery such as excavators and concrete placing booms often subject proportional valves to vibration and contaminants.

[0004] Existing testing machines for hydraulic valves, such as the "Testing Machine for Evaluating the Friction and Wear Performance of Hydraulic Valve Core and Body" (Chinese Patent CN 104374662 A), disclose a testing machine for evaluating the friction and wear performance of hydraulic valve core and body. This machine can simulate the actual working conditions of hydraulic valves, detect the wear amount of the valve core and body in real time, evaluate the friction and wear performance of the valve core and body, and predict their service life. However, existing testing machine technologies for hydraulic valves only focus on friction and wear at room temperature; they cannot handle complex working conditions such as high temperatures and contamination. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a high-temperature friction testing device for hydraulic spool valves, which can realize the complete restoration test of hydraulic valves and simulate complex working conditions caused by changes in temperature, contaminants, etc.

[0006] The objective of this invention is achieved through the following technical solution: a high-temperature friction testing device for hydraulic spool valves, the device comprising:

[0007] Valve core clamping module, used for centering and clamping the valve core under test;

[0008] Valve body mounting module, used to store oil and mount and fix the valve body;

[0009] The vertical force application module acts on the valve core clamping module to fix and adjust the position of the valve core clamping module and apply vertical pressure, while measuring pressure and friction.

[0010] The high-temperature heating module surrounds the valve core clamping module and the valve body mounting module;

[0011] The friction application module is connected to the valve body mounting module, driving the valve body to move axially and achieving relative friction between the valve core and the valve body.

[0012] Furthermore, the valve core clamping module includes a valve core under test, a valve core centering fixing post, a valve core fixing clamp, a valve core mounting rod, and a mounting rod fixing shell. A fixing threaded hole is opened on the axis of the valve core under test. The valve core centering fixing post is set between the valve core fixing clamp and the valve core under test. The spacing is adjusted by adjusting the length. A bolt is passed through the valve core fixing clamp and the valve core centering fixing post and screwed into the valve core under test to keep the three in a constant position. The valve core mounting rod is screwed into the threaded hole above the valve core fixing clamp. The mounting rod fixing shell has a groove on its side line, which can deform to fix the valve core mounting rod.

[0013] Furthermore, the valve body mounting module includes an oil reservoir, an oil reservoir fixing plate, and a valve body; the valve body is installed in the oil reservoir, the oil reservoir is installed on the oil reservoir fixing plate, and the oil reservoir fixing plate is connected to the friction force application module to cause the valve body to move axially.

[0014] Furthermore, the vertical force application module includes X, Y, and Z three-axis guide rails and pressure and friction force sensors, wherein the three-axis guide rails are driven by a motor, and the pressure and friction force sensors are used to measure pressure and friction force.

[0015] Furthermore, the outer shell of the high-temperature heating module is supported by insulation material, and the inner wall is equipped with a high-temperature generating resistance wire and a temperature sensor.

[0016] Furthermore, the high-temperature heating module is assembled by two halves joined together, forming a cavity in the middle, which surrounds the valve core clamping module and the valve body mounting module.

[0017] Furthermore, an opening is made at the top of the high-temperature heating module, allowing the upper part of the valve core mounting rod of the valve core clamping module to extend out and connect with the vertical force application module above; a slot is made at the bottom of the high-temperature heating module, allowing the oil reservoir fixing plate of the valve body mounting module to have axial movement space.

[0018] Furthermore, the friction application module is driven by a motor, which drives the oil reservoir to achieve axial reciprocating motion of the valve body.

[0019] Furthermore, the high-temperature friction testing device for the hydraulic spool valve is used to measure the friction and wear degradation law between the valve core and valve body under different working conditions such as normal temperature, high temperature, oil, and contamination.

[0020] The beneficial effects of this invention are as follows: By combining the valve core clamping structure and the valve body mounting structure, the real reciprocating friction effect of the hydraulic valve can be reproduced, and the magnitude of vertical pressure and friction force can be adjusted to achieve accelerated life testing of the valve core-valve body friction pair; by adding a high-temperature heating module, the high-temperature environment experienced by hydraulic valves in aero engines can be simulated; by adding an oil reservoir, wet friction of the valve core-valve sleeve friction pair can be achieved, better restoring the actual working scenario; and contaminant particles can be added to examine the friction and wear patterns and contamination resistance of the hydraulic valve after the oil is contaminated. Attached Figure Description

[0021] The following description, in conjunction with the accompanying drawings and embodiments, provides a more detailed explanation of the high-temperature friction testing device for a hydraulic slide valve according to the present invention.

[0022] Figure 1 This is an overall diagram of the high-temperature friction testing device for the hydraulic slide valve of the present invention.

[0023] Figure 2 This is an internal perspective view of the high-temperature friction testing device for the hydraulic slide valve of the present invention.

[0024] Figure 3 This is an assembly diagram of the valve core clamping module and valve body mounting module of the high-temperature friction testing device for hydraulic slide valves of the present invention.

[0025] Figure 4 This is a front view of the valve core clamping module of the high-temperature friction testing device for hydraulic slide valves of the present invention.

[0026] Figure 5 This is a top view of the valve body mounting module of the high-temperature friction testing device for hydraulic slide valves of the present invention. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the technical solutions will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that they can be more easily used by those skilled in the art of hydraulic valves and friction and wear research, thereby providing a clearer definition of the scope of protection of the present invention.

[0029] like Figures 1 to 5 The device shown is a high-temperature friction testing device for a hydraulic spool valve. The device includes a stand 1, a high-temperature heating module 2, a vertical force application module 3, a friction force application module 4, a valve core clamping module 5, and a valve body mounting module 6.

[0030] like Figure 1 and Figure 2 As shown, the test bench 1 integrates a vertical force application module 3 and a friction force application module 4, and is held in place by two beams and columns to support the high-temperature heating module 2. The valve core clamping module 5 and the valve body mounting module 6 are placed inside the high-temperature heating module 2. The friction force application module 4 is located below the high-temperature heating module 2 and is connected to the valve body mounting module 6. Driven by a motor, it can achieve high-frequency reciprocating motion, providing a frictional force source for the mating friction pair between the valve core 51 and the valve body 63 to simulate the reciprocating motion of the valve core during the actual operation of the hydraulic valve. The vertical force application module 3 is located above the high-temperature heating module 2 and includes X, Y, and Z three-axis motor guide rails 31 and pressure and friction force sensors 32. It can be adjusted in three directions and is connected to the valve core clamping module 5, which can precisely adjust the mating friction position between the valve core 51 and the valve body 63.

[0031] The X, Y, and Z three-axis guide rails are driven by a motor and are used to fix and adjust the position of the valve core clamping module 5, ultimately adjusting the mating position of the valve core 51 and the valve body 63, and can apply vertical pressure to change the friction force, thereby realizing the function of accelerated life test; the pressure and friction force sensor 32 is in direct contact with the valve core clamping module 5, and measures the vertical pressure and axial friction force between the valve core 51 and the valve body 63 through the force transmission effect.

[0032] The high-temperature heating module 2 has a temperature sensor and a high-temperature generating resistance wire installed on its inner wall. The outer casing is made of insulation material, which is designed as a split type. Two square halves of the outer casing fit together to form a cavity in the middle, facilitating assembly to surround the valve core clamping module 5 and the valve body mounting module 6. This allows for the application of a high-temperature environment to the critical friction pair of the valve core and valve body, effectively maintaining heat. An opening at the top of the outer casing of the high-temperature heating module 2 allows the valve core mounting rod of the valve core clamping module 5 to extend, and a square groove at the bottom allows the oil reservoir fixing plate of the valve body mounting module 6 to reciprocate. The high-temperature generating resistance wire is positioned close to the valve core clamping module 5 and the valve body mounting module 6 to reduce energy loss during heat transfer. The temperature sensor transmits the temperature data from the high-temperature cavity.

[0033] like Figure 4 As shown, the valve core clamping module 5 includes a valve core 51, a valve core centering fixing post 52, a valve core fixing clamp 53, a valve core mounting rod 54, and a mounting rod fixing shell 55. The valve core 51 is the test piece and can be replaced for different hydraulic valve structures. The dimensions of this module can be modified according to the dimensions of the valve core and valve body under test. Threaded holes can be made at both ends of the central axis of the valve core 51 for fixed connection, aligning with and connecting to the valve core centering fixing post 52. A valve core centering fixing post 52 is designed at both ends of the valve core 51 to facilitate fixing the valve core in the center position and to facilitate cooperation with the valve body 63. The valve core centering fixing post 52 is a hollow cylindrical component with a length that can be modified to align with the valve core 51 and the valve core fixing clamp 53, facilitating a tight connection for valve core fixation. The valve core fixing clamp 53 has a symmetrical structure with a circular hole on each side plate. This circular hole should be aligned with the center of the valve core centering fixing post 52 and the valve core 51 on the same axis. On the line, valve core fixing clamps 53 are installed on the outer side of the left and right valve core centering fixing posts 52. The valve core fixing clamps 53, valve core centering fixing posts 52, and valve core 51 can be connected and fixed by bolts or other methods. The top of the valve core fixing clamp 53 can be threaded. The valve core mounting rod 54 is installed on the valve core fixing clamp 53 and is used to adjust the position of the valve core fixing clamp 53, valve core centering fixing posts 52, and valve core 51, and to transmit pressure and friction. The valve core mounting rod 54 is a cylindrical rod with a thread at one end, which is connected to the valve core fixing clamp 53. The mounting rod fixing shell 55 is a hollow cylindrical shell with a narrow groove on the side. It fits around the valve core mounting rod 54. The groove on the side of the mounting rod fixing shell 55 can deform under external pressure to tightly clamp the valve core mounting rod. The mounting rod fixing shell 55 is installed on the pressure and friction sensor 32 in the vertical force application module 3 to transmit force.

[0034] like Figure 5 As shown, the valve body mounting module 6 includes an oil reservoir 61, an oil reservoir fixing plate 62, and a valve body 63. The valve body 63 is the test piece and can be replaced for different hydraulic valve structures. The dimensions of this module can also be modified according to the dimensions of the valve core and valve body under test. The bottom or side of the valve body 63 should be provided with mounting holes and installed in the oil reservoir 61. The oil reservoir is a square groove that completely surrounds and fixes the valve body 63. It can also add oil and contaminants to ensure that the bottom is sealed and does not leak. The bottom is connected to the oil reservoir fixing plate. The valve body 63 moves with the movement of the oil reservoir 61. The oil reservoir 61 is mounted on the oil reservoir fixing plate 62 and moves with the movement of the oil reservoir fixing plate 62. The oil reservoir fixing plate 62 is a square flat plate that is mounted on the friction application module 4 and moves with the movement of the motor guide rail of the friction application module 4.

[0035] The friction force application module 4 includes an X-axis guide rail; the X-axis guide rail is driven by a motor and connected to the oil storage tank fixing plate 62 in the valve body mounting module 6, which drives the oil storage tank 61 to realize the axial reciprocating motion of the valve body 63, thereby realizing the relative friction between the valve core 51 and the valve body 63.

[0036] like Figure 3 As shown, a feasible installation sequence is as follows: First, the oil reservoir fixing plate 62 is installed on the motor guide rail of the friction force application module 4, and the oil reservoir 61 is installed on the oil reservoir fixing plate 62; then, the valve core 51 is placed into the valve body 63, the valve core centering fixing post 52 is placed at both ends of the valve core 51, the valve core fixing clamp 53 is sleeved on the outside of the two valve core centering fixing posts 52, and the valve core 51 is tightly connected by bolts, the valve core mounting rod 54 is connected to the valve core fixing clamp 53, and the mounting rod fixing shell 55 is connected to the valve core mounting rod 54; then, the newly assembled upper part is connected to the force sensor and the base respectively, wherein the valve body 63 is installed in the oil reservoir 61, and the mounting rod fixing shell 55 is installed on the pressure and friction force sensor 32 in the vertical force application module 3.

[0037] This device can be used to study the friction and wear degradation patterns between the valve core and valve body under different working conditions such as normal temperature, high temperature, oil, and contamination. One specific implementation method is as follows:

[0038] 1. When the high-temperature heating module is not activated, room temperature friction and wear tests can be performed, including room temperature dry friction tests, room temperature wet friction tests, and room temperature oil contamination friction tests. Among them, room temperature dry friction tests can be performed without adding oil to the valve body mounting module, room temperature wet friction tests can be performed with clean oil added to the valve body mounting module, and room temperature oil contamination friction tests can be performed with oil containing contaminant particles added to the valve body mounting module.

[0039] 2. When the high-temperature heating module is activated, high-temperature friction and wear tests can be performed, including high-temperature dry friction tests, high-temperature wet friction tests, and high-temperature oil contamination friction tests. High-temperature dry friction tests can be performed without adding oil to the valve body mounting module, high-temperature wet friction tests can be performed with clean oil added to the valve body mounting module, and high-temperature oil contamination friction tests can be performed with oil containing contaminant particles added to the valve body mounting module.

[0040] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "lower," "one side," "top," "inner," "front," "center," "both ends," "left and right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature friction testing device for a hydraulic slide valve, characterized in that, The device includes: Valve core clamping module, used for centering and clamping the valve core under test; Valve body mounting module, used to store oil and mount and fix the valve body; The vertical force application module acts on the valve core clamping module to fix and adjust the position of the valve core clamping module and apply vertical pressure, while measuring pressure and friction. The high-temperature heating module surrounds the valve core clamping module and the valve body mounting module; the high-temperature heating module has an opening at the top, allowing the upper part of the valve core mounting rod of the valve core clamping module to extend out and connect with the vertical force application module above; the high-temperature heating module has a slot at the bottom, allowing the oil reservoir fixing plate of the valve body mounting module to have axial movement space. The friction application module is connected to the valve body mounting module and drives the valve body to move axially, thereby achieving relative friction between the valve core and the valve body. The valve core clamping module includes a valve core under test, a valve core centering fixing post, a valve core fixing clamp, a valve core mounting rod, and a mounting rod fixing shell. A fixing threaded hole is formed on the axis of the valve core under test. The valve core centering fixing post is positioned between the valve core fixing clamp and the valve core under test, and the spacing is adjusted by changing its length. Bolts are passed through the valve core fixing clamp and the valve core centering fixing post and screwed into the valve core under test to keep the three in a fixed position. The valve core mounting rod is screwed into the threaded hole above the valve core fixing clamp. The mounting rod fixing shell has a groove on its side, allowing it to deform to fix the valve core mounting rod. The valve body mounting module includes an oil storage tank, an oil storage tank fixing plate, and a valve body; the valve body is installed in the oil storage tank, the oil storage tank is installed on the oil storage tank fixing plate, and the oil storage tank fixing plate is connected to the friction force application module to cause the valve body to move axially; The oil storage tank is a square tank that completely surrounds and fixes the valve body. The bottom is sealed to prevent oil leakage. It is used to add oil and contaminants to achieve wet friction and contamination friction tests. The outer shell of the high-temperature heating module is supported by insulation material, and the inner wall is equipped with a high-temperature generating resistance wire and a temperature sensor. The high-temperature heating module is assembled by two halves joined together, forming a cavity in the middle, which surrounds the valve core clamping module and the valve body mounting module.

2. The high-temperature friction testing device for hydraulic slide valves according to claim 1, characterized in that: The vertical force application module includes X, Y, and Z three-axis guide rails and pressure and friction force sensors. The three-axis guide rails are driven by a motor, and the pressure and friction force sensors are used to measure pressure and friction force.

3. The high-temperature friction testing device for hydraulic slide valves according to claim 1, characterized in that: The friction force application module is driven by a motor, which drives the oil reservoir to achieve axial reciprocating motion of the valve body.

4. The high-temperature friction testing device for hydraulic slide valves according to claim 1, characterized in that: This device is used to measure the friction and wear degradation patterns between the valve core and valve body under different operating conditions.

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