A hydraulic system for electro-hydraulic CNC synchronous bending machine without filling liquid

Abstract

The present invention discloses a hydraulic system of an electro-hydraulic numerically controlled synchronous bending machine that does not require liquid filling, which belongs to the technical field of hydraulic control of bending machines, and includes a servo motor, an oil pump, a main pressure relief valve, a safety valve, a back pressure valve, a solenoid valve, a three-position four-way proportional solenoid valve, a two-position four-way solenoid valve, a two-position two-way solenoid valve, an oil cylinder and an oil tank. Through the above method, the oil cylinder structure is simplified, the working principle is optimized, and the effect of high-efficiency work and low-cost production can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control of bending machines, and in particular to a hydraulic system of an electro-hydraulic numerically controlled synchronous bending machine which does not require liquid filling. Background Art

[0002] Nowadays, each cycle of CNC bending machines can be divided into five processes: stop, fast down, working, pressure relief, and return. In each working process, the pressure and speed provided to the hydraulic system are also different. In the process of fast down of the hydraulic system of traditional CNC bending machines, a filling valve needs to be installed on the top of the cylinder to quickly fill the upper chamber of the cylinder with liquid, and the waiting time for fast to slow reaction is long, which greatly reduces the efficiency of the entire hydraulic system cycle; the traditional electro-hydraulic CNC synchronous bending machine has low efficiency, complex structure, and high production cost compared to the bending machine pressure system that does not require filling in the entire cycle. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and provide a hydraulic system for an electro-hydraulic numerically controlled synchronous bending machine which does not require liquid filling.

[0004] The technical solution of the present invention is: a hydraulic system of an electro-hydraulic CNC synchronous bending machine that does not require filling, comprising a servo motor, an oil pump, a main pressure relief valve, a safety valve, a back pressure valve, a solenoid valve, a three-position four-way proportional solenoid valve, a two-position four-way solenoid valve, a two-position two-way solenoid valve, a cylinder and a tank;

[0005] The output end of the servo motor is fixedly connected to the oil pump, the oil inlet of the oil pump is connected to the oil outlet of the oil tank, the oil outlet of the oil pump is connected to the P port of the three-position four-way proportional solenoid valve, the A port of the three-position four-way proportional solenoid valve is connected to the oil outlet of the back pressure valve and the oil outlet of the solenoid valve, the oil inlet of the back pressure valve and the oil inlet of the solenoid valve are connected to the lower cavity oil port of the oil cylinder, the T port of the three-position four-way proportional solenoid valve is connected to the P port of the two-position four-way solenoid valve, the B port of the three-position four-way proportional solenoid valve is connected to the upper cavity oil port of the oil cylinder, the B port of the two-position four-way solenoid valve is connected to the upper cavity oil port of the oil cylinder, and the oil inlet of the two-position two-way solenoid valve is connected to the upper cavity oil port of the oil cylinder. The oil port of the two-position four-way solenoid valve is connected, the T port of the two-position four-way solenoid valve is connected with the oil inlet of the oil tank, the oil outlet of the two-position two-way solenoid valve is connected with the oil inlet of the oil tank, the oil inlet of the safety valve is connected with the lower chamber oil port of the cylinder, the oil outlet of the safety valve is connected with the P port of the two-position four-way solenoid valve, the oil inlet of the main pressure relief valve is connected with the oil outlet of the oil pump, the oil outlet of the main pressure relief valve is connected with the oil inlet of the oil tank, the three-position four-way proportional solenoid valve includes solenoid one YV1 and solenoid two YV2, the solenoid valve includes solenoid three YV3, the two-position four-way solenoid valve includes solenoid four YV4, and the two-position two-way solenoid valve includes solenoid five YV5.

[0006] Preferably, the servo motor is powered on but not enabled, and the hydraulic system is in a standby state.

[0007] Preferably, the servo motor is powered on, solenoid 1 YV1, solenoid 3 YV3 and solenoid 4 YV4 are powered on, and the hydraulic system is in a state where the slide connected to the external bending machine is quickly lowered by the oil cylinder.

[0008] Preferably, the servo motor is energized, the electromagnet YV1 is energized, and the hydraulic system is in the working state.

[0009] Preferably, the servo motor is powered on for speed regulation, the electromagnet YV1 is powered on, and the hydraulic system is in a pressure-maintaining state.

[0010] Preferably, the servo motor is energized, the electromagnet YV2 is energized, and the hydraulic system is in a pressure relief state.

[0011] Preferably, the servo motor is powered on, solenoid 2 YV2 and solenoid 5 YV5 are powered on, and the hydraulic system is in a state where the cylinder controls the return of the slide connected to the external bending machine.

[0012] Preferably, the three-position four-way proportional solenoid valve is a sliding valve type.

[0013] Preferably, it also includes throttling damper 1, throttling damper 2 and throttling damper 3; the oil inlet of throttling damper 1 is connected to the lower chamber oil port of the oil cylinder, the oil outlet of throttling damper 1 is externally connected to a pressure measuring device, the oil inlet of throttling damper 2 is connected to the oil inlet of the main pressure relief valve, the oil outlet of throttling damper 2 is externally connected to a pressure measuring device, the oil inlet of throttling damper 3 is connected to the upper chamber oil port of the oil cylinder, and the oil outlet of throttling damper 3 is externally connected to a pressure measuring device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is used, the servo motor drives the oil pump to absorb oil from the oil tank and pressurize it to provide hydraulic oil to the oil cylinder. The hydraulic oil enters the oil cylinder through a three-position four-way proportional solenoid valve, a solenoid valve and a two-position four-way solenoid valve, and then flows back to the oil tank through a three-position four-way proportional solenoid valve, a two-position four-way solenoid valve and a two-position two-way solenoid valve. The servo motor changes the speed through a signal given by an external numerical control system, and the electromagnet YV1, the electromagnet YV2, the electromagnet YV3, the electromagnet YV4 and the electromagnet YV5 change the power-on sequence through the external numerical control system; the main pressure relief valve is connected to the oil pump to control the maximum pressure required for the working condition of the hydraulic system, the safety valve sets the maximum pressure borne by the lower chamber oil port of the oil cylinder, and the back pressure valve adjusts the supporting pressure of the machine tool on the slide plate, so that the slide plate remains stationary when the machine tool is not pressurized; the external magnetic scale is used to measure the movement position and movement speed of the output end of the oil cylinder and feeds back the signal to the external numerical control system, so that the hydraulic system can work without filling, thereby improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1The system block diagram of the hydraulic system of an electro-hydraulic numerically controlled synchronous bending machine that does not require liquid filling is provided in the present invention.

[0016] The numbers in the figure represent:

[0017] 1. Servo motor; 2. Oil pump; 3. Main pressure relief valve; 4. Safety valve; 5. Back pressure valve; 6. Solenoid valve; 7. Three-position four-way proportional solenoid valve; 8. Two-position four-way solenoid valve; 9. Two-position two-way solenoid valve; 10. Oil cylinder; 11. Throttle damper one; 12. Throttle damper two; 13. Throttle damper three; 14. Oil tank. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0020] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0021] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0022] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0023] like Figure 1 The figure shows a hydraulic system of an electro-hydraulic CNC synchronous bending machine without filling of the present invention, comprising a servo motor 1, an oil pump 2, a main pressure relief valve 3, a safety valve 4, a back pressure valve 5, a solenoid valve 6, a three-position four-way proportional solenoid valve 7, a two-position four-way solenoid valve 8, a two-position two-way solenoid valve 9, a cylinder 10 and a fuel tank 14; the output end of the servo motor 1 is fixedly connected to the oil pump 2, the oil inlet of the oil pump 2 is connected to the oil outlet of the fuel tank 14, and the oil outlet of the oil pump 2 is connected to the three-position four-way proportional solenoid valve 7, the two-position four-way proportional solenoid valve 8, the two-position two-way proportional solenoid valve 9, a fuel cylinder 10 and a fuel tank 14; the output end of the servo motor 1 is fixedly connected to the oil pump 2, the oil inlet of the oil pump 2 is connected to the oil outlet of the fuel tank 14, and the oil outlet of the oil pump 2 is connected to the three-position four-way proportional solenoid valve 7, the two-position four-way proportional solenoid valve 7, the two-position two-way proportional solenoid valve 8, the two-position two-way proportional solenoid valve 9, a fuel cylinder 10 and a fuel tank 14; The P port of the proportional solenoid valve 7 is connected, the A port of the three-position four-way proportional solenoid valve 7 is connected with the oil outlet of the back pressure valve 5 and the oil outlet of the solenoid valve 6, the oil inlet of the back pressure valve 5 and the oil inlet of the solenoid valve 6 are connected with the lower cavity oil port of the oil cylinder 10, the T port of the three-position four-way proportional solenoid valve 7 is connected with the P port of the two-position four-way solenoid valve 8, the B port of the three-position four-way proportional solenoid valve 7 is connected with the upper cavity oil port of the oil cylinder 10, and the B port of the two-position four-way solenoid valve 8 is connected with the upper cavity oil port of the oil cylinder 10. The oil inlet of the two-position two-way solenoid valve 9 is connected to the upper chamber oil port of the oil cylinder 10, the T port of the two-position four-way solenoid valve 8 is connected to the oil inlet of the oil tank 14, the oil outlet of the two-position two-way solenoid valve 9 is connected to the oil inlet of the oil tank 14, the oil inlet of the safety valve 4 is connected to the lower chamber oil port of the oil cylinder 10, the oil outlet of the safety valve 4 is connected to the P port of the two-position four-way solenoid valve 8, the oil inlet of the main pressure relief valve 3 is connected to the oil outlet of the oil pump 2, and the oil outlet of the main pressure relief valve 3 is connected to the oil tank 14. The oil inlet is connected, the three-position four-way proportional solenoid valve 7 includes solenoid one YV1 and solenoid two YV2, the solenoid valve 6 includes solenoid three YV3, the two-position four-way solenoid valve 8 includes solenoid four YV4, the two-position two-way solenoid valve 9 includes solenoid five YV5, the cylinder 10 is connected to the external magnetic scale, and the servo motor 1, the solenoid valve 6, the three-position four-way proportional solenoid valve 7, the two-position four-way solenoid valve 8, the two-position two-way solenoid valve 9 and the external magnetic scale are electrically connected to the external CNC system.

[0024] When the present invention is used, the servo motor 1 drives the oil pump 2 to suck oil from the oil tank 14 and pressurize it to provide hydraulic oil to the oil cylinder 10. The hydraulic oil enters the oil cylinder 10 through the three-position four-way proportional solenoid valve 7, the solenoid valve 6 and the two-position four-way solenoid valve 8, and then flows back to the oil tank 14 through the three-position four-way proportional solenoid valve 7, the two-position four-way solenoid valve 8 and the two-position two-way solenoid valve 9. The servo motor 1 changes the speed according to the signal given by the external numerical control system, and the electromagnet YV1, the electromagnet YV2, the electromagnet YV3, the electromagnet YV4 and the electromagnet YV5 are YV5 changes the power-on sequence through the external numerical control system; the main pressure relief valve 3 is connected to the oil pump 2 to control the maximum pressure required for the hydraulic system working condition, the safety valve 4 sets the maximum pressure that the lower chamber oil port of the cylinder 10 can withstand, and the back pressure valve 5 adjusts the supporting pressure of the machine tool on the slide, so that the slide remains stationary when the machine tool is not pressurized; the external magnetic scale is used to measure the movement position and movement speed of the output end of the cylinder 10 and feed back the signal to the external numerical control system, so that the hydraulic system can work without filling, thereby improving work efficiency.

[0025] The servo motor 1 is powered on but not enabled, and the hydraulic system is in a standby state.

[0026] When the present invention is used, the servo motor 1 does not generate power output, no hydraulic oil flows in the hydraulic system, and the whole system remains stationary.

[0027] The servo motor 1 is powered on, and solenoids 1 YV1, 3 YV3 and 4 YV4 are powered on. The hydraulic system is in a fast-down state where the oil cylinder 10 controls the slide connected to the external bending machine.

[0028] When the present invention is in use, under the current power-on condition, there are two oil circuits for hydraulic oil control. The flow direction of one oil circuit is: the hydraulic oil flows out of the lower chamber oil port of the oil cylinder 10, flows to the AT port of the three-position four-way proportional solenoid valve 7 through the solenoid valve 6, and then flows to the PB port of the two-position four-way proportional solenoid valve 8 to the upper chamber oil port of the oil cylinder 10; the flow direction of the other oil circuit is: the output end of the servo motor 1 drives the oil pump 2 to rotate forward, the oil pump 2 draws hydraulic oil from the oil tank 14 and flows to the PB port of the three-position four-way proportional solenoid valve 7, and then flows out to the upper chamber oil port of the oil cylinder 10. Through these two oil filling methods, the hydraulic oil can quickly fill the upper chamber of the oil cylinder 10, so that the oil cylinder 10 can control the sliding plate to move down quickly.

[0029] The servo motor 1 is powered on, the electromagnet YV1 is powered on, and the hydraulic system is in the working state.

[0030] When the present invention is used, the output end of the servo motor 1 drives the oil pump 2 to rotate forward, the oil pump 2 draws hydraulic oil from the oil tank 14 and flows to the PB port of the three-position four-way proportional solenoid valve 7, and then flows out to the upper chamber oil port of the oil cylinder 10. The hydraulic oil flows out of the lower chamber oil port of the oil cylinder 10, flows to the AT port of the three-position four-way proportional solenoid valve 7 through the back pressure valve 5, and then flows back to the oil tank 14 through the PT port of the two-position four-way solenoid valve 8, so that the oil cylinder 10 controls the slide plate to descend slowly.

[0031] The servo motor 1 is powered on for speed regulation, the electromagnet YV1 is powered on, and the hydraulic system is in a pressure-maintaining state.

[0032] When the present invention is used, the external numerical control system controls the servo motor 1 to change the rotation speed, and the output end of the servo motor 1 drives the oil pump 2 to rotate forward. The oil pump 2 draws hydraulic oil from the oil tank 14 and flows to the PB port of the three-position four-way proportional solenoid valve 7, and then flows out to the upper chamber oil port of the oil cylinder 10. The hydraulic oil flows out of the lower chamber oil port of the oil cylinder 10, flows to the AT port of the three-position four-way proportional solenoid valve 7 through the back pressure valve 5, and then flows back to the oil tank 14 through the PT port of the two-position four-way solenoid valve 8 to keep the system pressure stable.

[0033] The servo motor 1 is powered on, the electromagnet YV2 is powered on, and the hydraulic system is in a pressure relief state.

[0034] When the present invention is used, after the pressure maintaining state ends, the electromagnet 2 YV2 remains energized, the servo motor 1 maintains the torque but does not need the speed, the hydraulic oil flows out of the upper chamber oil port of the cylinder 10 to the BT port of the three-position four-way proportional solenoid valve 7, and then flows back to the oil tank 14, thereby releasing the pressure of the cylinder 10.

[0035] The servo motor 1 is powered on, solenoid 2 YV2 and electromagnet 5 YV5 are powered on, and the hydraulic system is in a state where the cylinder 10 controls the return of the slide connected to the external bending machine.

[0036] When the present invention is used, after the pressure relief state ends, electromagnet 2 YV2 continues to be energized, electromagnet 5 YV5 is energized, the output end of the servo motor 1 drives the oil pump 2 to rotate forward, and the oil pump 2 draws hydraulic oil from the oil tank 14 through the PA port of the three-position four-way proportional solenoid valve 7, and flows to the lower chamber oil port of the oil cylinder 10 through the solenoid valve 6. At the same time, the hydraulic oil flowing out of the upper chamber oil port of the oil cylinder 10 returns to the oil tank 14 through the two-position two-way solenoid valve 9, thereby realizing the return stroke of the slide plate driven by the oil cylinder 10.

[0037] The three-position four-way proportional solenoid valve 7 is of slide valve type.

[0038] It also includes a throttling damper 11, a throttling damper 2 12 and a throttling damper 3 13; the oil inlet of the throttling damper 11 is connected to the lower chamber oil port of the oil cylinder 10, the oil outlet of the throttling damper 11 is externally connected to a pressure measuring device, the oil inlet of the throttling damper 2 12 is connected to the oil inlet of the main pressure relief valve 3, the oil outlet of the throttling damper 2 12 is externally connected to a pressure measuring device, the oil inlet of the throttling damper 3 13 is connected to the upper chamber oil port of the oil cylinder 10, and the oil outlet of the throttling damper 3 13 is externally connected to a pressure measuring device.

[0039] When the present invention is used, the throttling damper 11, the throttling damper 2 12 and the throttling damper 3 13 respectively detect the lower chamber pressure of the oil cylinder 10, the upper chamber pressure of the oil cylinder 10 and the main pressure of the hydraulic system to achieve the stability of the hydraulic oil flow; the pressure value is displayed by an external pressure gauge to monitor the pressure condition of the system.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should belong to the technical scope of the present invention.

Claims

1. A hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require filling, characterized in that: It comprises a servo motor (1), an oil pump (2), a main pressure relief valve (3), a safety valve (4), a back pressure valve (5), a solenoid valve (6), a three-position four-way proportional solenoid valve (7), a two-position four-way solenoid valve (8), a two-position two-way solenoid valve (9), an oil cylinder (10) and an oil tank (14); The output end of the servo motor (1) is fixedly connected to the oil pump (2); the oil inlet of the oil pump (2) is connected to the oil outlet of the oil tank (14); the oil outlet of the oil pump (2) is connected to the P port of the three-position four-way proportional solenoid valve (7); the A port of the three-position four-way proportional solenoid valve (7) is connected to the oil outlet of the back pressure valve (5) and the oil outlet of the solenoid valve (6); the oil inlet of the back pressure valve (5) and the oil inlet of the solenoid valve (6) are connected to the lower chamber oil port of the oil cylinder (10); the T port of the three-position four-way proportional solenoid valve (7) is connected to the P port of the two-position four-way solenoid valve (8); the B port of the three-position four-way proportional solenoid valve (7) is connected to the upper chamber oil port of the oil cylinder (10); the B port of the two-position four-way solenoid valve (8) is connected to the upper chamber oil port of the oil cylinder (10); the oil inlet of the two-position two-way solenoid valve (9) is connected to the oil outlet of the oil cylinder (10); The upper chamber oil port is connected, the T port of the two-position four-way solenoid valve (8) is connected to the oil inlet of the oil tank (14), the oil outlet of the two-position two-way solenoid valve (9) is connected to the oil inlet of the oil tank (14), the oil inlet of the safety valve (4) is connected to the lower chamber oil port of the oil cylinder (10), the oil outlet of the safety valve (4) is connected to the P port of the two-position four-way solenoid valve (8), the oil inlet of the main pressure relief valve (3) is connected to the oil outlet of the oil pump (2), the oil outlet of the main pressure relief valve (3) is connected to the oil inlet of the oil tank (14), the three-position four-way proportional solenoid valve (7) includes an electromagnet one (YV1) and an electromagnet two (YV2), the solenoid valve (6) includes an electromagnet three (YV3), the two-position four-way solenoid valve (8) includes an electromagnet four (YV4), and the two-position two-way solenoid valve (9) includes an electromagnet five (YV5).

2. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without filling liquid according to claim 1 is characterized in that: The servo motor (1) is powered on but not enabled, and the hydraulic system is in a standby state.

3. The hydraulic system of the electro-hydraulic numerically controlled synchronous bending machine without liquid filling according to claim 1 is characterized in that: The servo motor (1) is energized, solenoid 1 (YV1), electromagnet 3 (YV3) and electromagnet 4 (YV4) are energized, and the hydraulic system is in a fast-down state.

4. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without filling liquid according to claim 1 is characterized in that: The servo motor (1) is energized, the electromagnet 1 (YV1) is energized, and the hydraulic system is in a working state.

5. The hydraulic system of the electro-hydraulic numerically controlled synchronous bending machine without filling liquid according to claim 1 is characterized in that: The servo motor (1) is powered on for speed regulation, the electromagnet (YV1) is powered on, and the hydraulic system is in a pressure-maintaining state.

6. The hydraulic system of the electro-hydraulic numerically controlled synchronous bending machine without filling liquid according to claim 1 is characterized in that: The servo motor (1) is energized, the second electromagnet (YV2) is energized, and the hydraulic system is in a pressure relief state.

7. The hydraulic system of the electro-hydraulic numerically controlled synchronous bending machine without filling liquid according to claim 1 is characterized in that: The servo motor (1) is energized, the second electromagnet (YV2) and the fifth electromagnet (YV5) are energized, and the hydraulic system is in a return state.

8. The hydraulic system of the electro-hydraulic numerically controlled synchronous bending machine without filling liquid according to claim 1 is characterized in that: The three-position four-way proportional solenoid valve (7) is of a sliding valve type.

9. The hydraulic system of the electro-hydraulic numerically controlled synchronous bending machine without filling liquid according to claim 1, characterized in that: It also includes a throttle damper 1 (11), a throttle damper 2 (12) and a throttle damper 3 (13); The oil inlet of the throttling damper 1 (11) is connected to the lower chamber oil port of the oil cylinder (10), the oil outlet of the throttling damper 1 (11) is externally connected to a pressure measuring device, the oil inlet of the throttling damper 2 (12) is connected to the oil inlet of the main pressure relief valve (3), the oil outlet of the throttling damper 2 (12) is externally connected to a pressure measuring device, the oil inlet of the throttling damper 3 (13) is connected to the upper chamber oil port of the oil cylinder (10), and the oil outlet of the throttling damper 3 (13) is externally connected to a pressure measuring device.

Images