Stiffness Testing Method of Flow Controller

Abstract

The present application discloses a stiffness testing method for a flow controller. The stiffness testing method for the flow controller includes: Step S1: Install the flow controller to be tested on the installation part, connect one hydraulic oil outlet of the flow controller to the oil inlet passage, and start working; Step S2: Use the processor to record the values collected by the displacement detection element, the pressure detection element, and the flow detection element; Step S3: After applying a predetermined pressure to the ejector rod by the pressurizing mechanism, repeat Step S2 until the pressure applied by the pressurizing mechanism to the ejector rod reaches a predetermined value; Step S4: Use the processor to generate a pressure-flow characteristic curve and a pressure-displacement curve of the flow controller. This testing method can test the stiffness of the flow controller, with simple operation and convenient loading.

Description

Technical Field

[0001] This application relates to the field of testing technologies, and more particularly, to a method for testing the stiffness of a flow controller. Background Art

[0002] Flow controllers are applied in precision machine tool guides and hydrostatic rotary components to achieve high motion accuracy requirements, thereby affecting the machining accuracy of the machine tool. The guarantee of high precision depends on the consistency of the flow rate output by the flow controller in the same guide or rotary component and the quality of the oil film stiffness.

[0003] The stiffness of the flow controller is generally 1500 N / μm. The existing testing method is to install the flow controller on a standard guide and perform a loading test. Each time, a load of 500 N is applied, and the test is carried out more than 30 times. The experimenter reads and records the data, and finally generates the corresponding pressure-flow characteristic curve and stiffness curve. Such a testing method is cumbersome for disassembling and assembling the flow controller, requires a large loading force, has poor usability, and low experimental efficiency. Summary of the Invention

[0004] The main purpose of this application is to provide a method for testing the stiffness of a flow controller, which can test the stiffness of the flow controller, is simple to operate, and convenient to load.

[0005] According to one aspect of the embodiments of this application, a method for testing the stiffness of a flow controller is provided. The method for testing the stiffness of the flow controller is executed by a stiffness testing device for the flow controller. The stiffness testing device includes:

[0006] An experimental bench, on which an installation part is provided for installing the flow controller to be tested;

[0007] A testing component, which includes a base, a guiding oil passage block, a ejector rod, and a pressurizing mechanism. The base is installed on the experimental bench, and an oil inlet passage is provided on the base. The first end of the oil inlet passage is used to communicate with the hydraulic oil outlet of the flow controller; the guiding oil passage block is installed on the base, and a first groove is provided on the side of the guiding oil passage block close to the base. An installation hole and an oil outlet hole are provided on the guiding oil passage block. The installation hole extends along the height direction of the guiding oil passage block and communicates with the first groove, and the oil outlet hole communicates with the first groove; the ejector rod is installed in the installation hole, and a static pressure chamber is formed between the bottom end surface of the ejector rod and the base. The second end of the oil inlet passage communicates with the static pressure chamber; the pressurizing mechanism is installed on the base to apply an axial pressure to the ejector rod;

[0008] A displacement detection element, which is arranged on the guiding oil passage block to detect the displacement of the ejector rod;

[0009] A pressure detection element, which is arranged at the oil inlet end of the oil inlet channel;

[0010] A flow rate detection element, which is arranged at the oil outlet end of the oil outlet hole;

[0011] A processor, which is communicatively connected to the displacement detection element, the pressure detection element and the flow rate detection element;

[0012] The stiffness test method of the flow controller includes:

[0013] Step S1: Install the flow controller to be tested on the installation part, connect one hydraulic oil outlet of the flow controller to the oil inlet channel, and start working;

[0014] Step S2: Use the processor to record the values collected by the displacement detection element, the pressure detection element and the flow rate detection element;

[0015] Step S3: After applying a predetermined pressure to the ejector rod by the pressurizing mechanism, repeat Step S2 until the pressure applied by the pressurizing mechanism to the ejector rod reaches a predetermined value;

[0016] Step S4: Use the processor to generate a pressure-flow characteristic curve and a pressure-displacement curve of the flow controller.

[0017] Further, the flow controller includes a plurality of hydraulic oil outlets, and the stiffness test method of the flow controller includes Step S5: Replace the hydraulic oil outlet communicated with the oil inlet channel, and repeat Step S2 to Step S4 until all the hydraulic oil outlets of the flow controller are replaced.

[0018] Further, the average stiffness value of the flow controller = pressure change amount / displacement change amount.

[0019] Further, the pressurizing mechanism includes:

[0020] A column, which is fixedly installed on the base and located outside the guiding oil circuit block;

[0021] A pressurizing rod, on which a pressurizing position is arranged. The pressurizing position is spaced a predetermined distance from both ends of the pressurizing rod. The pressurizing position is located at the top of the ejector rod. The first end of the pressurizing rod is rotatably connected to the top end of the column, and a hooking part is arranged at the second end of the pressurizing rod;

[0022] Pressurizing weights, and a plurality of the pressurizing weights are detachably installed on the hooking part.

[0023] Further, the length L1 from the pressurizing position to the first end of the pressurizing rod is less than the length L2 from the pressurizing position to the second end of the pressurizing rod.

[0024] Further, L1:L2 = 1:3.

[0025] Further, the ratio of the major axis to the minor axis of the ejector rod is 1:8.

[0026] Further, the design of the static pressure chamber satisfies the following relationship:

[0027]

[0028] Wherein, L1 and B1 are respectively the length and width of the oil pad of the rectangular static pressure chamber formed by connecting the flow controller to the marked guide rail, L2 and B2 are respectively the length and width of the rectangular static pressure chamber formed by connecting the flow controller to the marked guide rail, Le and Be are respectively the length and width of the effective bearing area of the rectangular static pressure chamber formed by connecting the flow controller to the marked guide rail, R1 is the radius of the static pressure chamber, R2 is the radius of the oil pad of the static pressure chamber, and Re is the radius of the effective bearing area of the static pressure chamber.

[0029] Further, the installation hole and the ejector rod are in clearance fit.

[0030] Further, the fit clearance between the installation hole and the ejector rod is less than 0.1 mm.

[0031] Compared with the prior art, the technical solution of the present application has at least the following technical effects:

[0032] Compared with the prior art in which the flow controller is installed on the standard guide rail for the loading test, the pressurization process of the stiffness test method in the present invention using the pressurization mechanism to pressurize the ejector rod is more convenient, the disassembly and assembly are easier, and the test efficiency of the flow controller can be improved. Description of the Drawings

[0033] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0034] Figure 1 is a schematic structural diagram of the stiffness test device of the flow controller disclosed in the embodiment of the present application;

[0035] Figure 2 is Figure 1 an enlarged view of the N area in;

[0036] Figure 3Schematic diagram of the structure of the test component disclosed in the embodiments of the present application;

[0037] Figure 4 Cross-sectional view of the test component disclosed in the embodiments of the present application;

[0038] Figure 5 Is Figure 4 Enlarged view of the M area in

[0039] Figure 6 Is Figure 5 Enlarged view of the I area in

[0040] Figure 7 Schematic diagram of the hydraulic oil circuit when the flow test is performed by the test device disclosed in the embodiments of the present application;

[0041] Figure 8 Schematic diagram of the hydraulic oil circuit when the stiffness test is performed by the test device disclosed in the embodiments of the present application;

[0042] Figure 9 Front view of the static pressure chamber part when the flow controller is installed on the marked guide rail;

[0043] Figure 10 Front view of the static pressure chamber part in the test device disclosed in the embodiments of the present application;

[0044] Figure 11 Flow chart of the test method disclosed in the embodiments of the present application.

[0045] Among them, the above-mentioned drawings include the following reference numerals:

[0046] 10. Test bench; 11. Installation part; 20. Test component; 21. Base; 211. Oil inlet channel; 212. Circular boss; 213. Annular limit protrusion; 22. Guide oil circuit block; 221. First groove; 222. Installation hole; 223. Oil outlet hole; 224. Annular limit groove; 23. Ejector rod; 231. Oil storage space; 232. Y-shaped joint; 233. Connecting cross beam; 24. Pressing mechanism; 241. Column; 242. Pressing rod; 2421. Hooking part; 2422. Pressing position; 243. Pressing weight; 30. Sealing ring; 40. Pressure detection element; 201. Static pressure chamber; 50. Flow detection element; 60. Processor; 70. Flow controller; 71. Hydraulic oil outlet; 90. Oil tank; 100. First oil filter; 110. Second oil filter; 120. Relief valve; 130. Throttle valve; 140. Displacement detection element; 150. Hydraulic pump. Detailed implementation manners

[0047] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] See Figures 1 to 6 As shown, according to an embodiment of the present application, a stiffness test device for a flow controller is provided. Hereinafter referred to as the stiffness test device, the stiffness test device includes a test bench 10 and a test assembly 20.

[0051] Among them, an installation part 11 is provided on the test bench 10, and the installation part 11 is used to install the flow controller 70 to be tested; the test assembly 20 includes a base 21, a guide oil circuit block 22, a push rod 23, and a pressurizing mechanism 24.

[0052] Specifically, the base 21 in this embodiment is installed on the test bench 10. An oil inlet passage 211 is provided on the base 21. The first end of the oil inlet passage 211 is used to communicate with the hydraulic oil outlet 71 of the flow controller 70. The guiding oil passage block 22 is installed on the base 21. A first groove 221 is provided on the side of the guiding oil passage block 22 close to the base 21. An installation hole 222 and an oil outlet hole 223 are provided on the guiding oil passage block 22. The installation hole 222 extends along the height direction of the guiding oil passage block 22 and communicates with the first groove 221. The oil outlet hole 223 communicates with the first groove 221. The ejector rod 23 is installed in the installation hole 222, and a static pressure chamber 201 is formed by surrounding between the bottom end surface of the ejector rod 23 and the base 21. The second end of the oil inlet passage 211 communicates with the static pressure chamber 201. The pressurizing mechanism 24 is installed on the base 21 to apply an axial pressure to the ejector rod 23.

[0053] When a stiffness test needs to be performed on the flow controller 70, it is only necessary to install the flow controller 70 on the installation part 11, and then connect the hydraulic oil outlet 71 of the flow controller 70 to the oil inlet passage 211 by using a pipeline or the like. Thereafter, the flow controller 70 is supplied with oil by the oil supply system, and the oil flowing out from the hydraulic oil outlet 71 of the flow controller 70 can enter the static pressure chamber 201 from the oil inlet passage 211. During this process, through the action of the pressurizing mechanism 24, pressure can be gradually applied to the ejector rod 23, so that the loading process during the operation of structures such as guide rails can be simulated. During the pressurizing process, by detecting the displacement of the ejector rod 23, the stiffness of the flow controller 70 can be measured. Compared with the prior art method of installing the flow controller 70 on a standard guide rail for loading test, the pressurizing process of the stiffness test device in this embodiment using the pressurizing mechanism 24 to apply pressure to the ejector rod 23 is more convenient, the disassembly and assembly are easier, and the test efficiency of the flow controller 70 can be improved.

[0054] See Figure 1 As shown, the test bench 10 in this embodiment is a platform structure. This platform structure can be a platform structure supported by brackets, or a platform structure built by support plates or the like. As long as it is a platform structure that is convenient for supporting and installing the test assembly 20 and the flow controller 70, no specific limitation is made in this application. The installation part 11 can be an installation groove or an installation hole or other structures, as long as it can support and install the flow controller 70.

[0055] See Figures 3 to 6As shown, the base 21 in this embodiment is a plate-like structure, which can be a circular plate, a square plate or other irregular plate-like structures. As long as it can support and install the guiding oil passage block 22, the ejector rod 23 and the pressurizing mechanism 24 in other deformation ways, they are all within the protection scope of this application. During actual installation, the base 21 can be fixed on the test bench 10 through structures such as screws, pins, and buckles. As long as it is in other deformation ways under the concept of this application, they are all within the protection scope of this application.

[0056] A circular boss 212 is provided on the base 21 in this embodiment. A static pressure chamber 201 is formed by enclosing between the top surface of the circular boss 212 and the bottom end surface of the ejector rod 23. The second end of the oil inlet passage 211 is located at the center of the top surface of the circular boss 212. With such a setting, after the flow controller 70 is connected to the oil inlet passage 211, the oil flowing out from the flow controller 70 can uniformly enter the static pressure chamber 201, which can improve the test accuracy of the flow controller 70.

[0057] See Figure 9 and Figure 10 As shown, the design of the static pressure chamber 201 in this embodiment satisfies the following relationship:

[0058]

[0059] Among them, L1 and B1 are respectively the length and width of the oil pad of the rectangular static pressure chamber formed when the flow controller 70 is connected to the marked guide rail, L2 and B2 are respectively the length and width of the rectangular static pressure chamber formed when the flow controller 70 is connected to the marked guide rail, Le and Be are respectively the length and width of the effective bearing area of the rectangular static pressure chamber formed when the flow controller 70 is connected to the marked guide rail, R1 is the radius of the static pressure chamber 201 in the embodiment of this application, R2 is the radius of the oil pad of the static pressure chamber 201 in this embodiment, and Re is the radius of the effective bearing area of the static pressure chamber 201 in the embodiment of this application. In this application, by making the design of the static pressure chamber 201 satisfy the above relational expressions, the square static pressure chamber when the flow controller 70 is connected to the marked guide rail can be equivalently converted and scaled into the circular static pressure chamber 201 in the test assembly 20, and thus the pressurizing difficulty of the ejector rod 23 can be greatly reduced.

[0060] Furthermore, the guiding oil passage block 22 in this embodiment can be set as a prismatic block structure, and can also be set as a cylindrical block structure or other irregular block structures, etc. The aforementioned installation hole 222 is provided in the height direction of the guiding oil passage block 22. During actual installation, there is a clearance fit between the ejector rod 23 and the installation hole 222, and the fit clearance between the ejector rod 23 and the installation hole 222 is less than 0.1 mm. With such a setting, when the pressurizing mechanism 24 is used to pressurize the ejector rod 23, the ejector rod 23 can smoothly move in the installation hole 222.

[0061] Furthermore, in this embodiment, the length-diameter ratio of the ejector rod 23 is 1:8, and the structure is stable and reliable. The contact surface between the bottom end surface of the ejector rod 23 and the base 21 needs to be lapped, that is, the bottom end surface of the ejector rod 23 is lapped with the circular boss 212, so as to ensure that there is no gap when the two are in contact, ensure the parallelism of the two surfaces during use, and ensure the reliability of the experiment.

[0062] Furthermore, in this embodiment, an oil storage space 231 is provided on the ejector rod 23. Through the function of the oil storage space 231, the oil entering between the mounting hole 222 and the ejector rod 23 can be stored to prevent the oil from leaking from the top end of the mounting hole 222. Optionally, the oil storage space 231 in this embodiment can be an oil storage hole or an oil storage groove and other structures. In the present application Figure 4 and Figure 5 shows the situation when the oil storage space 231 is an oil storage groove. The oil storage groove is an annular oil storage groove, which is arranged along the outer circumference of the ejector rod 23, with a simple structure and convenient processing. Optionally, the oil storage space 231 in this embodiment can be set to one, or can be set to two or more. The drawings of the present application show the situation when there are multiple oil storage spaces 231. The multiple oil storage spaces 231 are arranged at intervals along the length direction of the ejector rod 23, can store more oil, and can further avoid the occurrence of oil leakage.

[0063] Referring again to Figures 1 to 6 as shown, the pressurizing mechanism 24 in this embodiment includes a column 241, a pressurizing rod 242 and a pressurizing weight 243. Among them, the column 241 is fixedly installed on the base 21 and is located outside the guiding oil circuit block 22; a pressurizing position 2422 is provided on the pressurizing rod 242, and the pressurizing position 2422 is at a predetermined distance from both ends of the pressurizing rod 242. The pressurizing position 2422 is located at the top of the ejector rod 23. The first end of the pressurizing rod 242 is rotatably connected to the top end of the column 241, and a hooking portion 2421 is provided at the second end of the pressurizing rod 242; there are multiple pressurizing weights 243, and the multiple pressurizing weights 243 are detachably installed on the hooking portion 2421. When it is necessary to pressurize the ejector rod 23, only need to hang the pressurizing weight 243 on the hooking portion 2421 to apply pressure to the pressurizing rod 242, with a simple structure and easy to implement. When different pressures need to be loaded, only need to select different pressurizing weights 243 and hang them on the hooking portion 2421.

[0064] Further, the length L1 from the pressurizing position 2422 to the first end of the pressurizing rod 242 in this embodiment is less than the length L2 from the pressurizing position 2422 to the second end of the pressurizing rod 242. With such a setting, only a few pressurizing weights 243 need to be hung on the hooking portion 2421 to apply a large pressure to the ejector rod 23, which can reduce the pressurizing difficulty during the testing process of the flow controller 70 and improve the stiffness testing efficiency of the flow controller 70.

[0065] Since the stiffness of the flow controller 70 in the experimental standard guide rail reaches 1500 N / μm, and the traditional testing method loads 500 N each time until 15000 N. Such a large loading force and a cumbersome operation process. In order to reduce the loading difficulty during the testing process of the flow controller 70, reduce the loading force, and simplify the operation, the ratio of the length L1 from the pressurizing position 2422 to the first end of the pressurizing rod 242 to the length L2 from the pressurizing position 2422 to the second end of the pressurizing rod 242 in this embodiment is 1:3. At this time, the pressurizing rod 242 and the ejector rod 23 form a lever. Using the lever principle, the size of the experimental loading force is reduced again. The force application fulcrum (the second end of the pressurizing rod 242) is 4L away from the rotation origin (the first end of the pressurizing rod 242), and the position of the ejector rod 23 is L away from the origin (the first end of the pressurizing rod 242). According to the moment balance formula, when the weight of the pressurizing weight 243 is G, the force F on the ejector rod 23 is F = 4G. Therefore, applying 1 / 4 of the force can achieve the same effect as the original direct loading.

[0066] In order to position the pressurizing rod 242, a Y-shaped joint 232 is provided at the top end of the pressurizing rod 242 in this embodiment. A connecting cross beam 233 is provided inside the Y-shaped joint 232, and a tapping (not shown in the figure) that is clamped on the connecting cross beam 233 is provided at the pressurizing position 2422. The pressurizing position 2422 is engaged with the connecting cross beam 233 through tapping, which can position the pressurizing rod 242, and further improve the pressurizing stability of the pressurizing mechanism 24 on the ejector rod 23. Of course, in other embodiments of the present application, the pressurizing rod 242 can also be rotatably connected to the ejector rod 23 through structures such as a rotating shaft. As long as it is other deformation methods under the concept of the present application, they are all within the protection scope of the present application. The connecting cross beam 233 is fixed in the middle of the Y-shaped joint 232 through a pin shaft and can rotate around the central fulcrum of the Y-shaped joint 232. To ensure that the ejector rod 23 can move up and down with a small displacement and avoid over-positioning constraints, the opening at the mating part of the connecting cross beam 233 and the Y-shaped joint 232 should be slightly larger, that is, the mating method is a clearance fit. The end of the connecting cross beam 233 is connected to the hooking portion 2421. The hooking portion 2421 can be a connecting ring, and a weight tray is hung under the connecting ring. The pressurizing weight 243 is placed in the weight tray. When in use, the weight tray cannot shake with a large displacement. The pressurizing weight 243 is placed on the weight tray and can be used for loading during testing.

[0067] Further, one of the base 21 and the guiding oil passage block 22 is provided with an annular limiting projection 213, and the other is provided with an annular limiting groove 224 adapted to the annular limiting projection 213. That is to say, when the annular limiting projection 213 is provided on the guiding oil passage block 22, the annular limiting groove 224 is provided on the base 21; when the annular limiting projection 213 is provided on the base 21, the annular limiting groove 224 is provided on the guiding oil passage block 22. Through the mutual cooperation of the annular limiting projection 213 and the annular limiting groove 224, it is convenient to limit and install the guiding oil passage block 22. After the guiding oil passage block 22 is assembled, the mounting hole 222, the annular limiting projection 213, the annular limiting groove 224 and the circular boss 212 are coaxially arranged, which is convenient to improve the test accuracy of the flow controller 70.

[0068] Further, a sealing ring 30 is arranged between the base 21 and the guiding oil passage block 22 in this embodiment. The sealing ring 30 is arranged around the outer periphery of the annular limiting projection 213. Such an arrangement can prevent the oil in the static pressure chamber 201 from flowing out through the gap between the base 21 and the guiding oil passage block 22.

[0069] In order to facilitate the detection of the displacement of the ejector rod 23, the stiffness test device in this embodiment further includes a displacement detection element 140. The displacement detection element 140 is arranged on the guiding oil passage block 22, and thus the displacement of the ejector rod 23 can be detected. Optionally, the displacement detection element 140 in this embodiment can be a displacement sensor or the like.

[0070] Further, a pressure detection element 40 is arranged at the oil inlet end of the oil inlet passage 211, and a flow detection element 50 is arranged at the oil outlet end of the oil outlet hole 223. Through the action of the pressure detection element 40, the pressure of the oil entering the oil inlet passage 211 can be detected. Through the action of the flow detection element 50, it is convenient to detect the flow rate of the flow controller 70 to be tested. Optionally, the pressure detection element 40 in this embodiment is a pressure sensor, and the flow detection element 50 is a flow sensor.

[0071] Further, the stiffness detection device in this embodiment further includes a processor 60. The processor 60 can be a PC or the like, for example. The processor 60 is communicatively connected to the displacement detection element 140, the pressure detection element 40 and the flow detection element 50 respectively to generate a pressure-flow characteristic curve and a pressure-displacement curve of the flow controller 70.

[0072] See Figure 7As shown, the stiffness detection device in this embodiment is further provided with an oil tank 90, a hydraulic pump 150, a first oil filter 100, a second oil filter 110, a relief valve 120, and a throttle valve 130. The oil tank 90, the hydraulic pump 150, the first oil filter 100, the second oil filter 110, the relief valve 120, and the throttle valve 130 are connected by hoses, and the specific connection method is as Figure 7 shown. During actual operation, the hydraulic pump 150 operates, and the oil can enter the hydraulic pump 150 from the oil tank 90 through the first oil filter 100, and then enter the flow controller 70 through the second oil filter 110, and return to the oil tank 90 after passing through the throttle valve 130. A pressure detection element 40 is provided between the flow controller 70 and the throttle valve 130. Through the function of this pressure detection element 40, the pressure of the oil flowing out of the flow controller 70 can be detected. A flow detection element 50 is provided between the throttle valve 130 and the oil tank 90. Through the function of this flow detection element 50, it is convenient to detect the flow rate of the flow controller 70. Thereafter, through the function of the processor 60, a pressure-flow characteristic curve graph of the flow controller 70 can be generated.

[0073] See Figure 8 As shown, the stiffness detection device in this embodiment is further provided with an oil tank 90, a hydraulic pump 150, a first oil filter 100, a second oil filter 110, a relief valve 120, and a flow detection element 50. During actual operation, the hydraulic pump 150 operates, and the oil can enter the hydraulic pump 150 from the oil tank 90 through the first oil filter 100, and then enter the flow controller 70 through the second oil filter 110, and return to the oil tank 90 after passing through the test assembly 20 and the flow detection element 50. A pressure detection element 40 is provided between the flow controller 70 and the test assembly 20. Through the function of this pressure detection element 40, the pressure of the oil flowing out of the flow controller 70 can be detected. A flow detection element 50 is provided between the test assembly 20 and the oil tank 90. Through the function of this flow detection element 50, it is convenient to detect the flow rate of the flow controller 70. A displacement detection element 140 is provided on the test assembly 20. Through the function of this displacement detection element 140, the displacement of the ejector rod 23 can be detected. Thereafter, through the function of the processor 60, a pressure-displacement curve graph of the flow controller 70 can be generated.

[0074] Taking the 32 bar flow controller 70 as an example, when conducting the stiffness test, by increasing or decreasing the pressure weights 243 (the minimum increment each time is 2.5 N), the pressure at the hydraulic oil outlet 71 of the flow controller 70 can be changed: (1) Through the throttling effect of the flow controller 70, the flow corresponding to the pressure is discharged from the hydraulic oil outlet 71 of the flow controller 70, and the pressure value is displayed in the pressure detection element 40 for the experimenter to read and adjust the pressure; the flow discharged from the flow controller 70 corresponding to the pressure can be displayed on the flow detection element 50, and an external processor 60 automatically generates a pressure-flow characteristic curve graph after setting the pressure. (2) After loading, the ejector rod 23 will move downward, and the external displacement detection element 140 detects the central position of the ejector rod 23, so that the displacement of the ejector rod 23 after each loading can be measured. Inputting the weight after loading and the corresponding displacement into the program compiled in the processor 60 can generate the corresponding pressure-displacement curve graph, where the average stiffness value = force change amount / displacement change amount, and the stiffness when the obtained value is reversely equivalent to the experimental standard guide rail is obtained, that is, the stiffness test of the corresponding flow controller is completed.

[0075] Combined with Figures 1 to 11 As shown, the embodiment of the present invention also discloses a method for testing the stiffness of a flow controller, and this method for testing the stiffness of a flow controller is executed by using the stiffness test device in the above embodiment.

[0076] Specifically, the method for testing the stiffness of the flow controller in this embodiment includes the following steps:

[0077] Step S1: Install the flow controller 70 to be tested on the installation part 11, connect the oil outlet end of the flow controller 70 to the oil inlet channel 211, and then use the oil supply system to supply oil to the flow controller 70 to make the flow controller 70 start to work.

[0078] Step S2: Use the processor 60 to record the values collected by the displacement detection element 140, the pressure detection element 40, and the flow detection element 50.

[0079] Step S3: After using the pressurizing mechanism 24 to pressurize the ejector rod 23 to a predetermined pressure (that is, increasing a predetermined pressure each time), repeat Step S2 until the pressure applied by the pressurizing mechanism 24 to the ejector rod 23 reaches the predetermined value.

[0080] In this step, the predetermined pressure and the predetermined value can be determined and set according to the structure of the actually tested flow controller 70, and no specific limitation is made in this application. Taking a 32 bar flow controller as an example, during the flow rate test, by adjusting the knob of the throttle valve 130, the pressure of the hydraulic oil outlet 71 of the flow controller 70 can be changed, and through the throttling effect of the flow controller, the flow rate under the corresponding pressure is discharged from the flow controller. The pressure value is displayed in the pressure detection element 40, which is convenient for the experimenter to read and adjust the pressure; the flow rate discharged from the flow controller 70 under the corresponding pressure can be displayed on the flow detection element 50, and an external processor 60 automatically generates a pressure-flow characteristic curve after the set pressure. After loading, the ejector rod 23 will move downward, and the external displacement detection element 140 detects the central position of the ejector rod 23, and the displacement of the ejector rod 23 after each loading can be measured. During the experiment, the pressure can be adjusted by 0.1 Bar each time, and a total of 32 groups of data can be obtained to ensure the accuracy of the generated curve.

[0081] Step S4: Use the processor 60 to generate a pressure-flow characteristic curve and a pressure-displacement curve of the flow controller 70.

[0082] In this step, the loaded weight and the corresponding displacement are input into the program already compiled in the processor 60 to generate the corresponding pressure-displacement curve. Among them, the average stiffness value = force change amount / displacement change amount, and the obtained value is reversely equivalent to the stiffness of the experimental standard guide rail, that is, the stiffness test of the corresponding flow controller is completed.

[0083] Step S5: Replace the hydraulic oil outlet 71 communicating with the oil inlet passage 211, and repeat steps S2 to S4 until all the hydraulic oil outlets 71 of the flow controller 70 are replaced.

[0084] See Figure 1 and Figure 2 As shown in and, the flow controller 70 to be tested can be an integrated structure, and the integrally arranged flow controller 70 includes a plurality of hydraulic oil outlets 71. In order to comprehensively test the stiffness of the flow controller 70, it is necessary to continuously replace the hydraulic oil outlet 71 communicating with the oil inlet passage 211, and then repeat steps S2 to S4 until all the hydraulic oil outlets 71 of the flow controller 70 are replaced, so as to effectively test the flow controller 70.

[0085] In the present invention, the outlet pressure of the flow controller 70 is changed by adjusting the throttle valve 130, and the pressure-flow characteristic curve under each pressure can be obtained by connecting the flow detection element 50 to the external processor 60.

[0086] The present invention utilizes the lever principle to convert a large-stiffness experiment into a small-stiffness experiment for equivalent treatment of the static pressure chamber area. Each time, only a force of 2.5 N needs to be applied, and at the same time, by using a displacement sensor, the corresponding stiffness curve can be obtained.

[0087] The structure of the stiffness test device for the flow controller of the present invention is simple and highly reliable, and can replace the original test method, greatly improving the test efficiency. At the same time, the stiffness test device for the flow controller of the present invention can be applied to the flow test and stiffness test of flow controllers with various pressures and structural forms.

[0088] For the sake of convenience in description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper..." etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0089] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning, so it cannot be understood as a limitation on the protection scope of the present application.

[0090] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A stiffness testing method for a flow controller, characterized in that, The stiffness test method of the flow controller is performed by using a stiffness test device for the flow controller. The stiffness test device includes: A test bench (10), on which an installation part (11) is provided. The installation part (11) is used to install the flow controller (70) to be tested; A test component (20), which includes a base (21), a guiding oil passage block (22), a push rod (23) and a pressurizing mechanism (24). The base (21) is installed on the test bench (10). An oil inlet passage (211) is provided on the base (21). The first end of the oil inlet passage (211) is used to communicate with the hydraulic oil outlet (71) of the flow controller (70); The guiding oil passage block (22) is installed on the base (21). A first groove (221) is provided on the side of the guiding oil passage block (22) close to the base (21). An installation hole (222) and an oil outlet hole (223) are provided on the guiding oil passage block (22). The installation hole (222) extends along the height direction of the guiding oil passage block (22) and communicates with the first groove (221). The oil outlet hole (223) communicates with the first groove (221); The push rod (23) is installed in the installation hole (222), and a static pressure chamber (201) is formed by surrounding between the bottom end surface of the push rod (23) and the base (21). The second end of the oil inlet passage (211) communicates with the static pressure chamber (201); The pressurizing mechanism (24) is installed on the base (21) to apply an axial pressure to the push rod (23). The pressurizing mechanism (24) includes a column (241), a pressurizing rod (242) and pressurizing weights (243). The column (241) is fixedly installed on the base (21) and is located outside the guiding oil passage block (22); A pressurizing position (2422) is provided on the pressurizing rod (242). The pressurizing position (2422) is spaced a predetermined distance from both ends of the pressurizing rod (242). The pressurizing position (2422) is located at the top of the push rod (23). The first end of the pressurizing rod (242) is rotatably connected to the top end of the column (241). A hanging part (2421) is provided at the second end of the pressurizing rod (242); The pressurizing weights (243) are multiple, and the multiple pressurizing weights (243) are detachably installed on the hanging part (2421); A displacement detection element (140), which is arranged on the guiding oil passage block (22) to detect the displacement of the push rod (23); A pressure detection element (40), which is arranged at the oil inlet end of the oil inlet passage (211); A flow detection element (50), which is arranged at the oil outlet end of the oil outlet hole (223); A processor (60), which is communicatively connected to the displacement detection element (140), the pressure detection element (40), and the flow rate detection element (50); The stiffness testing method of the flow controller includes: Step S1: Install the flow controller (70) to be tested on the installation part (11), connect one hydraulic oil outlet (71) of the flow controller (70) to the oil inlet passage (211), and start working; Step S2: Use the processor (60) to record the values collected by the displacement detection element (140), the pressure detection element (40), and the flow rate detection element (50); Step S3: After applying a predetermined pressure to the ejector rod (23) by the pressurizing mechanism (24), repeat Step S2 until the pressure applied by the pressurizing mechanism (24) to the ejector rod (23) reaches a predetermined value; Step S4: Use the processor (60) to generate a pressure-flow characteristic curve graph and a pressure-displacement curve graph of the flow controller (70).

2. The stiffness testing method of the flow controller according to claim 1, characterized in that The flow controller (70) includes a plurality of hydraulic oil outlets (71), and the stiffness testing method of the flow controller includes Step S5: Replace the hydraulic oil outlet (71) connected to the oil inlet passage (211), and repeat Step S2 to Step S4 until all the hydraulic oil outlets (71) of the flow controller (70) are replaced.

3. The stiffness testing method of the flow controller according to claim 1, characterized in that The average stiffness value of the flow controller (70) = pressure change amount / displacement change amount.

4. The stiffness testing method of the flow controller according to claim 1, characterized in that The length L1 from the pressurizing position (2422) to the first end of the pressurizing rod (242) is less than the length L2 from the pressurizing position (2422) to the second end of the pressurizing rod (242).

5. The stiffness test method of the flow controller according to claim 4, characterized in that L1:L2 = 1:3 6. The stiffness testing method of the flow controller according to claim 1, characterized in that The length-diameter ratio of the ejector rod (23) is 1:

8.

7. The stiffness test method of the flow controller according to claim 1, characterized in that, The design of the static pressure chamber (201) satisfies the following relationship: where L1 and B1 are respectively the length and width of the oil pad of the rectangular static pressure chamber formed when the flow controller (70) is connected to the marked guide rail, L2 and B2 are respectively the length and width of the rectangular static pressure chamber of the flow controller (70) connected to the marked guide rail, Le and Be are respectively the length and width of the effective bearing area of the rectangular static pressure chamber formed when the flow controller (70) is connected to the marked guide rail, R1 is the radius of the static pressure chamber (201), R2 is the radius of the oil pad of the static pressure chamber (201), and Re is the radius of the effective bearing area of the static pressure chamber (201).

8. The stiffness test method of the flow controller according to any one of claims 1 to 7, characterized in that A clearance fit exists between the mounting hole (222) and the ejector rod (23).

9. The stiffness test method of the flow controller according to claim 8, characterized in that, The fit clearance between the mounting hole (222) and the ejector rod (23) is less than 0.1 mm.

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