Universal machine servo control system and working method thereof

Abstract

The application discloses a universal machine servo control system and a working method thereof, relates to the technical field of mechanical testing, and is characterized in that a first conversion valve is arranged between a second oil pump and a main oil cylinder, the first conversion valve has a first working position e and a second working position f, when the first conversion valve is powered, the first conversion valve is located at the first working position e, the second oil pump and the main oil cylinder are communicated, when the first conversion valve is powered off, the first conversion valve is located at the second working position f, and the second oil pump and the main oil cylinder are blocked. At the beginning of work, the position of the first cross beam needs to be adjusted, at this time, the jaw assembly does not move, the main electromagnetic valve is located at a first working position a, an oil path between the first oil pump and the main oil cylinder is conducted, a secondary electromagnetic valve is located at a second working position d, an oil path between the second oil pump and the secondary oil cylinder is blocked, the first conversion valve is located at the first working position e, and the oil path between the second oil pump and the main oil cylinder is conducted. The first oil pump and the second oil pump both supply oil to the main oil cylinder, the power of the main oil cylinder for driving the first cross beam to move is greatly improved, and the moving efficiency of the first cross beam is further improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical testing technology, specifically to a universal servo control system and its operating method. Background Technology

[0002] Tensile testing is one of the fundamental methods for testing the mechanical properties of materials. It is primarily used to verify whether materials meet specified standards and to study their performance. Taking the application of metallic materials in the construction field as an example, in reinforced concrete structures, concrete mainly plays a role in resisting compression, while steel bars mainly play a role in resisting tension. The mechanical response of reinforced concrete structures largely depends on the material properties of the reinforced concrete. A universal testing machine, integrating tensile, bending, compression, shear, and ring stiffness testing functions, is mainly used for testing the mechanical properties of metallic and non-metallic materials. It is an ideal testing equipment for industrial and mining enterprises, research institutions, universities, and engineering quality supervision stations.

[0003] Most existing universal testing machines use a single oil pump, which results in a slow completion speed for each test, especially when lifting the moving crossbeam. This slow speed prevents the moving crossbeam from moving into position quickly, affecting the test process. Summary of the Invention

[0004] 1. The technical problem that the invention aims to solve

[0005] To address the aforementioned technical problems, this invention provides a universal machine servo control system and its operating method. By supplying oil to the main oil cylinder through both the first oil pump and the second oil pump, it greatly enhances the power of the main oil cylinder to drive the first crossbeam, thereby improving the moving efficiency of the first crossbeam.

[0006] 2. Technical Solution

[0007] To solve the above problems, the technical solution provided by the present invention is as follows: a universal machine servo control system, comprising a first oil pump, a second oil pump, a main oil cylinder, an auxiliary oil cylinder, a first crossbeam, a second crossbeam, and a jaw assembly. The main oil cylinder is connected to the first crossbeam and drives the first crossbeam to move. The jaw assembly is respectively installed on the first crossbeam and the second crossbeam. The auxiliary oil cylinder is connected to the jaw assembly and drives the jaw assembly to move. A main solenoid valve is provided between the first oil pump and the main oil cylinder. The main solenoid valve has a first working position a and a second working position b. When the main solenoid valve is energized, it is located in the first working position a, and the first oil pump and the main oil cylinder are connected. When the main solenoid valve is de-energized, it is located in the second working position b. The first oil pump and the main oil cylinder are disconnected; a secondary solenoid valve is provided between the second oil pump and the secondary oil cylinder, the secondary solenoid valve having a first working position c and a second working position d. When the secondary solenoid valve is energized, it is located in the first working position c, and the second oil pump and the secondary oil cylinder are connected. When the secondary solenoid valve is de-energized, it is located in the second working position d, and the second oil pump and the secondary oil cylinder are disconnected; a first switching valve is provided between the second oil pump and the main oil cylinder, the first switching valve having a first working position e and a second working position f. When the first switching valve is energized, it is located in the first working position e, and the second oil pump and the main oil cylinder are connected. When the first switching valve is de-energized, it is located in the second working position f, and the second oil pump and the main oil cylinder are disconnected.

[0008] Optionally, a second switching valve is provided between the first oil pump, the first switching valve, and the main solenoid valve. The second switching valve has a first working position g and a second working position h. When the second switching valve is energized, it is located at the second working position h, and the first oil pump and the first switching valve are connected. When the second switching valve is de-energized, it is located at the first working position g, and the first oil pump and the main solenoid valve are connected.

[0009] Optionally, the oil outlet A of the first switching valve is connected to the lower chamber of the main cylinder, and the oil outlet B of the first switching valve is connected to the upper chamber of the main cylinder. When the first switching valve is in the first working position e, the oil inlet P of the first switching valve is connected to the oil outlet A and the oil outlet B of the first switching valve respectively. When the first switching valve is in the second working position f, the oil inlet P of the first switching valve is separated from the oil outlet A and the oil outlet B of the first switching valve respectively.

[0010] Optionally, the oil inlet P of the second switching valve is connected to the first oil pump. When the second switching valve is in the first working position g, the oil inlet P of the second switching valve is connected to the oil outlet A of the second switching valve. When the second switching valve is in the second working position h, the oil inlet P of the second switching valve is connected to the oil outlet B of the second switching valve. The oil outlet A of the second switching valve is connected to the oil inlet P of the main solenoid valve, and the oil outlet B of the second switching valve is connected to the oil inlet P of the first switching valve.

[0011] Optionally, when the main solenoid valve is in the first working position a, the oil inlet P of the main solenoid valve is connected to the oil outlet B of the main solenoid valve; when the main solenoid valve is in the second working position b, the oil inlet P of the main solenoid valve is connected to the oil return port T of the main solenoid valve.

[0012] Optionally, the jaw assembly includes a first jaw and a second jaw. The first jaw is mounted on the main crossbeam, and the second jaw is mounted on the secondary crossbeam. The secondary cylinder includes a first jaw cylinder and a second jaw cylinder. The first jaw cylinder drives the first jaw to move, and the second jaw cylinder drives the second jaw to move. The secondary solenoid valve includes a first secondary valve and a second secondary valve. The first secondary valve opens or closes the oil passage between the first jaw cylinder and the second oil pump, and the second secondary valve opens or closes the oil passage between the second jaw cylinder and the second oil pump. Both the first secondary valve and the second secondary valve are one-way valves.

[0013] Optionally, the system also includes a frame, which includes a top plate, a support column, and a base. One end of the support column is connected to the top plate, and the other end is connected to a second crossbeam. The second crossbeam is mounted on the base. Both the first and second oil pumps are mounted inside the base. The piston rod of the main oil cylinder passes through the second crossbeam and is connected to the first crossbeam. A guide sleeve is provided between the piston rod and the support column. One end of the guide sleeve is connected to the piston rod, and the other end of the guide sleeve is slidably sleeved on the outer periphery of the support column. A spring is provided between the second crossbeam and the base.

[0014] Optionally, the main cylinder includes a first cylinder and a second cylinder. The piston rod of the first cylinder passes through a second crossbeam and is supported at one end of the first crossbeam. The piston rod of the second cylinder passes through the second crossbeam and is supported at the other end of the first crossbeam. The first cylinder and the second cylinder are connected in parallel.

[0015] Optionally, it also includes a controller and a servo motor connected to the controller. Load sensors are respectively provided between the first crossbeam and the first oil cylinder and between the first crossbeam and the second oil cylinder. The load sensors are connected to the controller. The servo motor is connected to the first oil pump, the second oil pump and the main solenoid valve respectively.

[0016] This invention also discloses a method for operating the universal machine servo control system described above, comprising the following steps:

[0017] (1) At the beginning of operation: the auxiliary solenoid valve is located in the second working position d, the first switching valve is located in the first working position e, the second switching valve is located in the second working position h, and the main solenoid valve is located in the second working position b;

[0018] (2) Clamping the sample: The auxiliary solenoid valve is located in the first working position c, the first switching valve is located in the second working position f, the second switching valve is located in the first working position g, and the main solenoid valve is located in the second working position b.

[0019] (3) Test sample: The auxiliary solenoid valve is located in the first working position c, the first switching valve is located in the second working position f, the second switching valve is located in the first working position g, and the main solenoid valve is located in the first working position a.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0022] (1) The universal machine servo control system proposed in this application requires the position of the first crossbeam to be adjusted at the beginning of operation. At this time, the jaw assembly does not move, the main solenoid valve is located at the first working position a, the oil circuit between the first oil pump and the main oil cylinder is connected, the auxiliary solenoid valve is located at the second working position d, the oil circuit between the second oil pump and the auxiliary oil cylinder is blocked, the first switching valve is located at the first working position e, the oil circuit between the second oil pump and the main oil cylinder is connected, and both the first oil pump and the second oil pump supply oil to the main oil cylinder, which greatly improves the power of the main oil cylinder to drive the first crossbeam to move, thereby improving the moving efficiency of the first crossbeam.

[0023] (2) In the universal machine servo control system proposed in this application embodiment, the oil inlet P of the first switching valve is connected to the oil outlet B of the second oil pump and the second switching valve respectively. When the first switching valve is in the first working position e, the oil inlet P of the first switching valve is connected to the oil outlet A and the oil outlet B of the first switching valve respectively. The hydraulic oil is delivered to the lower chamber of the main cylinder through the oil inlet P and the oil outlet A of the first switching valve. The hydraulic oil flows back from the upper chamber of the main cylinder to the oil outlet B of the first switching valve and flows back to the oil inlet P of the first switching valve. The oil inlet P of the first switching valve continues to supply oil to the main cylinder through the oil outlet A of the first switching valve. In this way, the oil return of the main cylinder does not return to the oil tank, but returns to the oil circuit, saving energy and further improving the moving speed and efficiency of the first crossbeam.

[0024] (3) The universal machine servo control system proposed in this application reduces the rebound tension of the second crossbeam by the spring when the first and second crossbeams break the sample, thereby ensuring the stability of the base and reducing the noise generated during the test. The first and second oil cylinders are connected in parallel and loaded synchronously, with a maximum control pressure of 60MPa. This reduces the diameter of the traditional single oil cylinder, making it possible to reduce the overall size of the machine. At the same time, both the first and second oil cylinders are bidirectional oil cylinders. The bidirectional oil cylinders have a certain shock absorption effect when the sample is broken in the tensile test, reducing the amplitude of machine vibration and vibration noise. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the universal machine servo control system proposed in an embodiment of the present invention.

[0026] Figure 2 This is a hydraulic control diagram of the universal machine servo control system proposed in an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the universal machine servo control system proposed in an embodiment of the present invention.

[0028] The labels in the attached figures are as follows: 1. First oil pump; 2. Second oil pump; 3. Main oil cylinder; 301. First oil cylinder; 302. Second oil cylinder; 4. Auxiliary oil cylinder; 401. First jaw cylinder; 402. Second jaw cylinder; 5. First crossbeam; 6. Second crossbeam; 7. Jaw assembly; 701. First jaw; 702. Second jaw; 8. Main solenoid valve; 9. Auxiliary solenoid valve; 901. First auxiliary valve; 902. Second auxiliary valve; 10. First switching valve; 11. Second switching valve; 12. Frame; 1201. Top plate; 1202. Support column; 1203. Base; 1204. Guide sleeve; 1205. Spring; 13. Controller; 14. Servo motor; 1401. Servo driver; 15. Load sensor; 16. Pressure gauge; 17. Overflow valve; 18. Oil tank; 19. Test software interface; 20. Coupling. Detailed Implementation

[0029] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0030] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0031] Example 1

[0032] Combined with appendix Figure 1-3The universal machine servo control system of this embodiment includes a first oil pump 1, a second oil pump 2, a main oil cylinder 3, an auxiliary oil cylinder 4, a first crossbeam 5, a second crossbeam 6, and a jaw assembly 7. The main oil cylinder 3 is connected to the first crossbeam 5 and drives the first crossbeam 5 to move. The jaw assembly 7 is respectively installed on the first crossbeam 5 and the second crossbeam 6. The auxiliary oil cylinder 4 is connected to the jaw assembly 7 and drives the jaw assembly 7 to move. A main solenoid valve 8 is provided between the first oil pump 1 and the main oil cylinder 3. The main solenoid valve 8 has a first working position a and a second working position b. When the main solenoid valve 8 is energized, it is located in the first working position a, and the first oil pump 1 and the main oil cylinder 3 are connected. When the main solenoid valve 8 is de-energized, it is located in the second working position b, and the first oil pump 1 and the main oil cylinder 3 are connected. The system provides the following: A secondary solenoid valve 9 is provided between the second oil pump 2 and the secondary oil cylinder 4. The secondary solenoid valve 9 has a first working position c and a second working position d. When the secondary solenoid valve 9 is energized, it is located at the first working position c, and the second oil pump 2 and the secondary oil cylinder 4 are connected. When the secondary solenoid valve 9 is de-energized, it is located at the second working position d, and the second oil pump 2 and the secondary oil cylinder 4 are disconnected. A first switching valve 10 is provided between the second oil pump 2 and the main oil cylinder 3. The first switching valve 10 has a first working position e and a second working position f. When the first switching valve 10 is energized, it is located at the first working position e, and the second oil pump 2 and the main oil cylinder 3 are connected. When the first switching valve 10 is de-energized, it is located at the second working position f, and the second oil pump 2 and the main oil cylinder 3 are disconnected. At the beginning of operation, the position of the first crossbeam 5 needs to be adjusted. At this time, the jaw assembly 7 does not move, the main solenoid valve 8 is in the first working position a, the oil circuit between the first oil pump 1 and the main oil cylinder 3 is open, the auxiliary solenoid valve 9 is in the second working position d, the oil circuit between the second oil pump 2 and the auxiliary oil cylinder 4 is blocked, the first switching valve 10 is in the first working position e, the oil circuit between the second oil pump 2 and the main oil cylinder 3 is open, the first oil pump 1 and the second oil pump 2 both supply oil to the main oil cylinder 3, which greatly improves the power of the main oil cylinder 3 to drive the first crossbeam 5 to move, thereby improving the moving efficiency of the first crossbeam 5.

[0033] Example 2

[0034] Combined with appendix Figure 1-3Compared with the technical solution of Embodiment 1, the universal machine servo control system of this embodiment can be improved as follows: A second switching valve 11 is provided between the first oil pump 1, the first switching valve 10, and the main solenoid valve 8. The second switching valve 11 has a first working position g and a second working position h. When the second switching valve 11 is energized, it is located at the second working position h, and the first oil pump 1 and the first switching valve 10 are connected. When the second switching valve 11 is de-energized, it is located at the first working position g, and the first oil pump 1 and the main solenoid valve 8 are connected. At the beginning of operation, the second switching valve 11 is located at the second working position h, and the oil circuit between the first oil pump 1 and the first switching valve 10 is connected. The first switching valve 10 is located at the first working position e, which connects the oil circuit between the second oil pump 2 and the main oil cylinder 3. Both the second oil pump 2 and the first oil pump 1 supply oil to the main oil cylinder 3 through the first switching valve 10.

[0035] Example 3

[0036] Combined with appendix Figure 1-3 Compared with the technical solutions of Embodiment 1 or 2, the universal machine servo control system of this embodiment can be improved as follows: the oil outlet A of the first switching valve 10 is connected to the lower chamber of the main oil cylinder 3, the oil outlet B of the first switching valve 10 is connected to the upper chamber of the main oil cylinder 3, when the first switching valve 10 is in the first working position e, the oil inlet P of the first switching valve 10 is connected to the oil outlet A and the oil outlet B of the first switching valve 10 respectively, and when the first switching valve 10 is in the second working position f, the oil inlet P of the first switching valve is separated from the oil outlet A and the oil outlet B of the first switching valve 10 respectively.

[0037] The inlet P of the first switching valve 10 is connected to the outlet B of the second oil pump 2 and the second switching valve 11, respectively. When the first switching valve 10 is in the first working position e, the inlet P of the first switching valve 10 is connected to the outlet A and outlet B of the first switching valve 10, respectively. Hydraulic oil is delivered to the lower chamber of the main cylinder 3 through the inlet P and outlet A of the first switching valve 10. The hydraulic oil flows back from the upper chamber of the main cylinder 3 to the outlet B of the first switching valve 10 and then back to the inlet P of the first switching valve 10. The inlet P of the first switching valve 10 continues to supply oil to the main cylinder 3 through the outlet A of the first switching valve 10. In this way, the return oil from the main cylinder 3 does not return to the oil tank 18, but returns to the oil circuit, saving energy and further improving the moving speed and efficiency of the first crossbeam 5. The contact area between the hydraulic oil and the upper chamber of the main cylinder 3 is smaller than the contact area between the hydraulic oil and the lower chamber of the main cylinder 3, resulting in greater pressure of the hydraulic oil on the lower chamber of the main cylinder 3 and increasing the rising speed of the piston in the upper chamber of the cylinder. A pressure gauge 16 and an overflow gauge are also installed in the oil circuit.

[0038] Example 4

[0039] Combined with appendix Figure 1-3 Compared with any one of the technical solutions in embodiments 1-3, the universal machine servo control system of this embodiment can be improved as follows: the oil inlet P of the second switching valve 11 is connected to the first oil pump 1. When the second switching valve 11 is in the first working position g, the oil inlet P of the second switching valve 11 is connected to the oil outlet A of the second switching valve 11. When the second switching valve 11 is in the second working position h, the oil inlet P of the second switching valve 11 is connected to the oil outlet B of the second switching valve 11. The oil outlet A of the second switching valve 11 is connected to the oil inlet P of the main solenoid valve 8. The oil outlet B of the second switching valve 11 is connected to the oil inlet P of the first switching valve 10. When the second switching valve 11 is in the first working position g, the oil inlet P of the second switching valve 11 is connected to the oil outlet A of the second switching valve 11, and the second switching valve 11 connects the oil circuit between the first oil pump 1 and the main solenoid valve 8; when the second switching valve 11 is in the second working position h, the oil inlet P of the second switching valve 11 is connected to the oil outlet B of the second switching valve 11, and the second switching valve 11 connects the oil circuit between the first oil pump 1 and the first switching valve 10.

[0040] Example 5

[0041] Combined with appendix Figure 1-3 Compared with any one of the technical solutions in embodiments 1-4, the universal machine servo control system of this embodiment can be improved as follows: When the main solenoid valve 8 is in the first working position a, the oil inlet P of the main solenoid valve 8 is connected to the oil outlet B of the main solenoid valve 8; when the main solenoid valve 8 is in the second working position b, the oil inlet P of the main solenoid valve 8 is connected to the oil return port T of the main solenoid valve 8. The oil inlet P of the main solenoid valve 8 is connected to the oil outlet A of the second switching valve 11, and the oil return port T of the main solenoid valve 8 is connected to the oil tank 18.

[0042] Example 6

[0043] Combined with appendix Figure 1-3 Compared with any one of the technical solutions in embodiments 1-5, the universal machine servo control system of this embodiment can be improved as follows: The jaw assembly 7 includes a first jaw 701 and a second jaw 702. The first jaw 701 is mounted on the main crossbeam, and the second jaw 702 is mounted on the secondary crossbeam. The secondary cylinder 4 includes a first jaw cylinder 401 and a second jaw cylinder 402. The first jaw cylinder 401 drives the first jaw 701 to move, and the second jaw cylinder 402 drives the second jaw 702 to move. The secondary solenoid valve 9 includes a first secondary valve 901 and a second secondary valve 902. The first secondary valve 901 opens or blocks the oil passage between the first jaw cylinder 401 and the second oil pump 2, and the second secondary valve 902 opens or blocks the oil passage between the second jaw cylinder 402 and the second oil pump 2. Both the first secondary valve 901 and the second secondary valve 902 are one-way valves.

[0044] Example 7

[0045] Combined with appendix Figure 1-3 Compared with any one of the technical solutions in embodiments 1-6, the universal machine servo control system of this embodiment can be improved as follows: It further includes a frame 12, which includes a top plate 1201, a support column 1202, and a base 1203. One end of the support column 1202 is connected to the top plate 1201, and the other end is connected to a second crossbeam 6. The second crossbeam 6 is mounted on the base 1203. The first oil pump 1 and the second oil pump 2 are both mounted inside the base 1203. The piston rod of the main oil cylinder 3 passes through the second crossbeam 6 and is connected to the first crossbeam 5. A guide sleeve 1204 is provided between the piston rod and the support column 1202. One end of the guide sleeve 1204 is connected to the piston rod, and the other end of the guide sleeve 1204 is slidably sleeved on the outer periphery of the support column 1202. A spring 1205 is provided between the second crossbeam 6 and the base 1203. An oil tank 18 is provided inside the base 1203, and the first oil pump 1 and the second oil pump 2 are respectively installed inside the oil tank 18. When the first crossbeam 5 and the second crossbeam 6 break the sample, the spring 1205 dampens the rebound tension of the second crossbeam 6, thereby ensuring the stability of the base 1203 and reducing the noise generated during the test.

[0046] Example 8

[0047] Combined with appendix Figure 1-3 Compared with any one of the technical solutions in embodiments 1-7, the universal machine servo control system of this embodiment can be improved as follows: The main oil cylinder 3 includes a first oil cylinder 301 and a second oil cylinder 302. The piston rod of the first oil cylinder 301 passes through the second crossbeam 6 and is supported at one end of the first crossbeam 5. The piston rod of the second oil cylinder 302 passes through the second crossbeam 6 and is supported at the other end of the first crossbeam 5. The first oil cylinder 301 and the second oil cylinder 302 are connected in parallel. The first oil cylinder 301 and the second oil cylinder 302 are loaded synchronously in parallel. The maximum control pressure can reach 60MPa, which reduces the diameter of the traditional single oil cylinder and provides the possibility of reducing the overall size of the machine. At the same time, the first oil cylinder 301 and the second oil cylinder 302 are both bidirectional oil cylinders. When the sample is broken in the tensile test, the bidirectional oil cylinder has a certain shock absorption effect, which reduces the amplitude of machine vibration and vibration noise.

[0048] Example 9

[0049] Combined with appendix Figure 1-3Compared with any one of the technical solutions in embodiments 1-8, the universal machine servo control system of this embodiment can be improved as follows: it further includes a controller 13 and a servo motor 14 connected to the controller 13. Load sensors 15 are respectively provided between the first crossbeam 5 and the first oil cylinder 301 and between the first crossbeam 5 and the second oil cylinder 302. The load sensors 15 are connected to the controller 13. The servo motor 14 is connected to the first oil pump 1, the second oil pump 2 and the main solenoid valve 8 respectively.

[0050] The user operates the test software interface 19 according to the test requirements, sending commands to the controller 13. The servo motor 14 controls its speed according to the signal commands from the controller 13. The controller 13 receives force signals from two load sensors 15 and compares them with the set values. The controller 15 then outputs a signal to control the start and stop of the first oil pump 1 and the second oil pump 2 via the motor. This ensures the entire test process is completed according to the set requirements. The main solenoid valve 8, i.e., the digital servo valve (self-made digital directional throttle valve patent: ZL202021336524.5), can be used to adjust the speed of the servo motor 14, achieving a quiet and energy-saving effect. After the tested sample is completed, the first jaw 701 and the second jaw 702 can accurately maintain the initial position of the sample in the disconnected state, while the entire frame 12 does not experience significant vibration. The servo motor 14 is connected to the first oil pump 1 and the second oil pump 2 via a coupling 20 located inside the oil tank 18. This integrates the main body of the servo motor 14 and the oil source, reducing the overall size and weight of the machine and minimizing external oil pipes and connecting cables, thus achieving installation-free operation. The controller 13 controls the servo motor 14 via a servo driver 1401.

[0051] Example 10

[0052] Combined with appendix Figure 1-3 The working method of the universal machine servo control system in the above-mentioned scheme of this embodiment includes the following steps:

[0053] (1) At the beginning of operation: the auxiliary solenoid valve 9 is located in the second working position d, the first switching valve 10 is located in the first working position e, the second switching valve 11 is located in the second working position h, and the main solenoid valve 8 is located in the second working position b.

[0054] (2) Clamping the sample: The auxiliary solenoid valve 9 is located in the first working position c, the first switching valve 10 is located in the second working position f, the second switching valve 11 is located in the first working position g, and the main solenoid valve 8 is located in the second working position b.

[0055] (3) Test sample: Auxiliary solenoid valve 9 is located in the first working position c, first switching valve 10 is located in the second working position f, second switching valve 11 is located in the first working position g, and main solenoid valve 8 is located in the first working position a.

[0056] At the beginning of operation, the position of the first crossbeam 5 needs to be adjusted. At this time, the jaw assembly 7 does not move. The second switching valve 11 is in the second working position h. The oil circuit between the first oil pump 1 and the first switching valve 10 is connected. The first switching valve 10 is in the first working position e, so that the oil circuit between the second oil pump 2 and the main oil cylinder 3 is connected. Both the second oil pump 2 and the first oil pump 1 supply oil to the main oil cylinder 3 through the first switching valve 10.

[0057] When clamping a sample, the jaw assembly 7 needs to clamp the sample; the crossbeam is stationary, the auxiliary solenoid valve 9 is in the first working position c, the oil circuit between the second oil pump 2 and the auxiliary oil cylinder 4 is open, the first switching valve 10 is in the second working position f, the oil circuit between the main oil cylinder 3 and the second oil pump 2 is blocked, the second switching valve 11 is in the first working position g, the oil circuit between the first switching valve 10 and the second switching valve 11 is blocked, the oil circuit between the first oil pump 1 and the main solenoid valve 8 is open, the main solenoid valve 8 is in the second working position b, and the hydraulic oil of the first oil pump 1 flows back to the oil tank 18 through the return port T of the main solenoid valve 8;

[0058] When testing samples, the jaw assembly 7 and the first crossbeam 5 work independently. The auxiliary solenoid valve 9 is in the first working position c, and the oil circuit between the second oil pump 2 and the auxiliary oil cylinder 4 is open. The first switching valve 10 is in the second working position f, and the oil circuit between the main oil cylinder 3 and the second oil pump 2 is blocked. The second switching valve 11 is in the first working position g, and the oil circuit between the first switching valve 10 and the second switching valve 11 is blocked. The oil circuit between the first oil pump 1 and the main solenoid valve 8 is open. The main solenoid valve 8 is in the first working position a, and the oil circuit between the first oil pump 1 and the main oil cylinder 3 is open.

[0059] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A universal machine servo control system, characterized in that, It includes a first oil pump, a second oil pump, a main oil cylinder, an auxiliary oil cylinder, a first crossbeam, a second crossbeam, and a jaw assembly. The main oil cylinder is connected to the first crossbeam and drives the first crossbeam to move. The jaw assembly is respectively installed on the first crossbeam and the second crossbeam. The auxiliary oil cylinder is connected to the jaw assembly and drives the jaw assembly to move. A main solenoid valve is provided between the first oil pump and the main oil cylinder. The main solenoid valve has a first working position a and a second working position b. When the main solenoid valve is energized, the main solenoid valve is located at the first working position a, and the first oil pump and the main oil cylinder are connected. When the main solenoid valve is de-energized, the main solenoid valve is located at the second working position b, and the first oil pump and the main oil cylinder are blocked. A secondary solenoid valve is provided between the second oil pump and the secondary oil cylinder. The secondary solenoid valve has a first working position c and a second working position d. When the secondary solenoid valve is energized, it is located in the first working position c, and the second oil pump and the secondary oil cylinder are connected. When the secondary solenoid valve is de-energized, it is located in the second working position d, and the second oil pump and the secondary oil cylinder are blocked. A first switching valve is provided between the second oil pump and the main oil cylinder. The first switching valve has a first working position e and a second working position f. When the first switching valve is energized, the first switching valve is located at the first working position e, and the second oil pump and the main oil cylinder are connected. When the first switching valve is de-energized, the first switching valve is located at the second working position f, and the second oil pump and the main oil cylinder are blocked. A second switching valve is provided between the first oil pump, the first switching valve, and the main solenoid valve. The second switching valve has a first working position g and a second working position h. When the second switching valve is energized, the second switching valve is located at the second working position h, and the first oil pump and the first switching valve are connected. When the second switching valve is de-energized, the second switching valve is located at the first working position g, and the first oil pump and the main solenoid valve are connected. The oil outlet A of the first switching valve is connected to the lower chamber of the main oil cylinder, and the oil outlet B of the first switching valve is connected to the upper chamber of the main oil cylinder. When the first switching valve is in the first working position e, the oil inlet P of the first switching valve is connected to the oil outlet A and the oil outlet B of the first switching valve respectively. When the first switching valve is in the second working position f, the oil inlet P of the first switching valve is separated from the oil outlet A and the oil outlet B of the first switching valve respectively. The oil inlet P of the second switching valve is connected to the first oil pump. When the second switching valve is in the first working position g, the oil inlet P of the second switching valve is connected to the oil outlet A of the second switching valve. When the second switching valve is in the second working position h, the oil inlet P of the second switching valve is connected to the oil outlet B of the second switching valve. The oil outlet A of the second switching valve is connected to the oil inlet P of the main solenoid valve, and the oil outlet B of the second switching valve is connected to the oil inlet P of the first switching valve.

2. The universal machine servo control system according to claim 1, characterized in that, When the main solenoid valve is in the first working position a, the oil inlet P of the main solenoid valve is connected to the oil outlet B of the main solenoid valve. When the main solenoid valve is in the second working position b, the oil inlet P of the main solenoid valve is connected to the oil return port T of the main solenoid valve.

3. The universal machine servo control system according to claim 1, characterized in that, The jaw assembly includes a first jaw and a second jaw. The first jaw is mounted on the main crossbeam, and the second jaw is mounted on the secondary crossbeam. The secondary cylinder includes a first jaw cylinder and a second jaw cylinder. The first jaw cylinder drives the first jaw to move, and the second jaw cylinder drives the second jaw to move. The secondary solenoid valve includes a first secondary valve and a second secondary valve. The first secondary valve opens or closes the oil passage between the first jaw cylinder and the second oil pump, and the second secondary valve opens or closes the oil passage between the second jaw cylinder and the second oil pump. Both the first secondary valve and the second secondary valve are one-way valves.

4. The universal machine servo control system according to claim 1, characterized in that, It also includes a frame, which includes a top plate, a support column, and a base. One end of the support column is connected to the top plate, and the other end of the support column is connected to a second crossbeam. The second crossbeam is mounted on the base. The first oil pump and the second oil pump are both mounted inside the base. The piston rod of the main oil cylinder passes through the second crossbeam and is connected to the first crossbeam. A guide sleeve is provided between the piston rod and the support column. One end of the guide sleeve is connected to the piston rod, and the other end of the guide sleeve is slidably sleeved on the outer periphery of the support column. A spring is provided between the second crossbeam and the base.

5. The universal machine servo control system according to claim 1, characterized in that, The main hydraulic cylinder includes a first hydraulic cylinder and a second hydraulic cylinder. The piston rod of the first hydraulic cylinder passes through a second crossbeam and is supported at one end of the first crossbeam. The piston rod of the second hydraulic cylinder passes through the second crossbeam and is supported at the other end of the first crossbeam. The first hydraulic cylinder and the second hydraulic cylinder are connected in parallel.

6. The universal machine servo control system according to claim 5, characterized in that, It also includes a controller and a servo motor connected to the controller. Load sensors are respectively provided between the first crossbeam and the first oil cylinder and between the first crossbeam and the second oil cylinder. The load sensors are connected to the controller. The servo motor is connected to the first oil pump, the second oil pump and the main solenoid valve respectively.

7. A method for operating the universal machine servo control system according to any one of claims 2 to 6, characterized in that, Includes the following steps: (1) At the beginning of operation: the auxiliary solenoid valve is located in the second working position d, the first switching valve is located in the first working position e, the second switching valve is located in the second working position h, and the main solenoid valve is located in the second working position b; (2) Clamping the sample: The auxiliary solenoid valve is located in the first working position c, the first switching valve is located in the second working position f, the second switching valve is located in the first working position g, and the main solenoid valve is located in the second working position b; (3) Test sample: The auxiliary solenoid valve is located in the first working position c, the first switching valve is located in the second working position f, the second switching valve is located in the first working position g, and the main solenoid valve is located in the first working position a.

Images