Electro-hydraulic numerical control synchronous bending machine hydraulic system without liquid filling

Abstract

The utility model discloses an electro-hydraulic numerical control synchronous bending machine hydraulic system without liquid filling, which belongs to the technical field of bending machine hydraulic control and comprises a servo motor, an oil pump, a main pressure overflow valve, a safety valve, a back pressure valve, an electromagnetic valve, a three-position four-way proportional electromagnetic valve, a two-position four-way electromagnetic valve, a two-position two-way electromagnetic valve, an oil cylinder and an oil tank. Through the mode, the oil cylinder structure is simplified, the working principle is optimized, and the effects of high-efficiency working and low-cost production can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology for bending machines, and in particular to a hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require filling with fluid. Background Technology

[0002] Currently, each cycle of a CNC bending machine can be divided into five processes: stop, rapid descent, working feed, pressure release, and return. The pressure and speed supplied to the hydraulic system vary in each process. In the rapid descent process, traditional CNC bending machine hydraulic systems require a filling valve at the top of the cylinder to quickly fill the upper chamber with hydraulic fluid. Furthermore, the transition from rapid to slow speed has a long reaction time, significantly reducing the overall efficiency of the hydraulic system cycle. Compared to bending machine systems that do not require fluid filling, traditional electro-hydraulic CNC synchronous bending machines are less efficient, more structurally complex, and have higher production costs throughout the entire cycle. Utility Model Content

[0003] The purpose of this invention is to solve the problems in the prior art and provide a hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require filling with fluid.

[0004] The technical solution of this utility model is: a hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require filling, including 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.

[0005] The output end of the servo motor is fixedly connected to the oil pump. The oil pump's inlet is connected to the oil tank's outlet. The oil pump's outlet 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 outlet of the back pressure valve and the outlet of the solenoid valve. The inlet of the back pressure valve and the inlet of the solenoid valve are connected to the lower chamber oil port of the 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 chamber oil port of the cylinder. The B port of the two-position four-way solenoid valve is connected to the upper chamber oil port of the cylinder. The inlet of the two-position two-way solenoid valve is connected to the upper chamber oil port of the cylinder. The oil ports of the two-position four-way solenoid valve are connected. The T port of the two-position two-way solenoid valve is connected to the oil inlet of the oil tank. The oil outlet of the two-position two-way solenoid valve is connected to the oil inlet of the oil tank. The oil inlet of the safety valve is connected to the oil port of the lower chamber of the oil cylinder. The oil outlet of the safety valve is connected to the P port of the two-position four-way solenoid valve. The oil inlet of the main pressure relief valve is connected to the oil outlet of the oil pump. The oil outlet of the main pressure relief valve is connected to 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. 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 standby mode.

[0007] Preferably, when the servo motor is energized, electromagnets YV1, YV3, and YV4 are energized, and the hydraulic system is in a state where the slide plate connected to the external bending machine is rapidly descending under the control of 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 energized for speed regulation, the electromagnet YV1 is energized, and the hydraulic system is in a pressure-holding state.

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

[0011] Preferably, when the servo motor is energized, electromagnets YV2 and YV5 are energized, and the hydraulic system is in the state of sliding plate return controlled by the oil cylinder and connected to the external bending machine.

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

[0013] Preferably, it further includes a first throttling damper, a second throttling damper, and a third throttling damper; the oil inlet of the first throttling damper is connected to the lower chamber oil port of the cylinder, and the oil outlet of the first throttling damper is connected to an external pressure measuring device; the oil inlet of the second throttling damper is connected to the oil inlet of the main pressure relief valve, and the oil outlet of the second throttling damper is connected to an external pressure measuring device; the oil inlet of the third throttling damper is connected to the upper chamber oil port of the cylinder, and the oil outlet of the third throttling damper is connected to an external pressure measuring device.

[0014] Compared with the prior art, the advantages of this utility model are as follows: 1. When this utility model is used, the servo motor drives the oil pump to draw oil from the oil tank and pressurize it to supply hydraulic oil to the oil cylinder. The hydraulic oil enters the oil cylinder through the three-position four-way proportional solenoid valve, the solenoid valve, and the two-position four-way solenoid valve, and then flows back to the oil tank through the three-position four-way proportional solenoid valve, the two-position four-way solenoid valve, and the two-position two-way solenoid valve. The servo motor changes its speed according to the signal given by the external CNC system. The energizing sequence of electromagnets YV1, YV2, YV3, YV4, and YV5 is changed by the external CNC system. The main pressure relief valve is connected to the oil pump to control the maximum pressure required for the hydraulic system to operate. The safety valve sets the maximum pressure that the lower chamber oil port of the oil cylinder can withstand. The back pressure valve adjusts the support pressure on the machine tool for 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 oil cylinder output end and feeds the signal back to the external CNC system, realizing that the hydraulic system can work without filling with fluid, thus improving work efficiency. Attached Figure Description

[0015] Figure 1 This is a system block diagram of a hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require filling.

[0016] The labels in the diagram 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. Throttling damper one; 12. Throttling damper two; 13. Throttling damper three; 14. Oil tank. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “said,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise; “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 merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0021] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0022] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0023] like Figure 1 The diagram shows a hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require filling, 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, 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, and the oil outlet of the oil pump 2 is connected to the three-position four-way proportional solenoid valve 10. The P port of the three-position four-way proportional solenoid valve 7 is connected; 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 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 cylinder 10; and the B port of the two-position four-way solenoid valve 8 is connected to the upper chamber oil port of the cylinder 10. The inlet of the two-position two-way solenoid valve 9 is connected to the upper chamber port of the cylinder 10; the T port of the two-position four-way solenoid valve 8 is connected to the inlet of the oil tank 14; the outlet of the two-position two-way solenoid valve 9 is connected to the inlet of the oil tank 14; the inlet of the safety valve 4 is connected to the lower chamber port of the cylinder 10; the outlet of the safety valve 4 is connected to the P port of the two-position four-way solenoid valve 8; the inlet of the main pressure relief valve 3 is connected to the outlet of the oil pump 2; and the outlet of the main pressure relief valve 3 is connected to the oil tank 14. The oil inlet of valve 4 is connected. The three-position four-way proportional solenoid valve 7 includes solenoid YV1 and solenoid YV2. The solenoid valve 6 includes solenoid YV3. The two-position four-way solenoid valve 8 includes solenoid YV4. The two-position two-way solenoid valve 9 includes solenoid YV5. The oil cylinder 10 is connected to an external magnetic scale. The servo motor 1, solenoid valve 6, three-position four-way proportional solenoid valve 7, two-position four-way solenoid valve 8, two-position two-way solenoid valve 9 and external magnetic scale are electrically connected to an external CNC system.

[0024] In use, the servo motor 1 drives the oil pump 2 to draw and pressurize oil from the oil tank 14 and supply 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, solenoid valve 6, and 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, two-position four-way solenoid valve 8, and two-position two-way solenoid valve 9. The servo motor 1 changes its speed according to the signal given by the external numerical control system. Electromagnets YV1, YV2, YV3, YV4, and YV5 are also activated. The YV5 system changes the power-on sequence via an external CNC system; the main pressure relief valve 3 is connected to the oil pump 2 to control the maximum pressure required for the hydraulic system's operation; the safety valve 4 sets the maximum pressure borne by the lower chamber oil port of the cylinder 10; the back pressure valve 5 adjusts the support pressure on the machine tool's slide plate, ensuring that the slide plate remains stationary without pressurization; an external magnetic scale is used to measure the movement position and speed of the cylinder 10's output end and feeds the signal back to the external CNC system, enabling the hydraulic system to operate without filling, thus improving work efficiency.

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

[0026] When this utility model is in use, the servo motor 1 does not generate power output, there is no hydraulic oil flowing in the hydraulic system, and the whole remains stationary.

[0027] When the servo motor 1 is energized, electromagnets YV1, YV3, and YV4 are energized, and the hydraulic system is in the state of rapid descent of the slide plate, which is controlled by the oil cylinder 10 and connected to the external bending machine.

[0028] When this utility model 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: hydraulic oil flows out of the lower chamber oil port of the cylinder 10, flows through the solenoid valve 6 to the AT port of the three-position four-way proportional solenoid valve 7, and then flows to the PB port of the two-position four-way solenoid valve 8 to the upper chamber oil port of the 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 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 cylinder 10. Through these two oil injection methods, the hydraulic oil quickly fills the upper chamber of the cylinder 10, realizing the control of the cylinder 10 to quickly lower the slide plate.

[0029] When the servo motor 1 is energized and the electromagnet YV1 is energized, the hydraulic system is in the working state.

[0030] When this utility model is in use, 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 from the lower chamber oil port of the oil cylinder 10, flows through the back pressure valve 5 to the AT port of the three-position four-way proportional solenoid valve 7, and then flows back to the oil tank 14 through the PT port of the two-position four-way solenoid valve 8, so as to realize that the oil cylinder 10 controls the slide plate to descend slowly.

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

[0032] When this utility model is in use, the external CNC system controls the servo motor 1 to change its speed. 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. Then it flows out to the upper chamber oil port of the oil cylinder 10. The hydraulic oil flows out from the lower chamber oil port of the oil cylinder 10, flows through the back pressure valve 5 to the AT port of the three-position four-way proportional solenoid valve 7, and then flows back to the oil tank 14 through the PT port of the two-position four-way solenoid valve 8, thus maintaining the stability of the system pressure.

[0033] When the servo motor 1 is energized and the electromagnet YV2 is energized, the hydraulic system is in a depressurized state.

[0034] When this utility model is in use, after the pressure holding state ends, the electromagnet YV2 remains energized, the servo motor 1 maintains torque but does not require speed, and the hydraulic oil flows out of the upper chamber of the oil 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 realizing the pressure release of the oil cylinder 10.

[0035] When the servo motor 1 is energized, electromagnets YV2 and YV5 are energized, and the hydraulic system is in the state where the slide plate connected to the external bending machine is controlled by the oil cylinder 10 for return.

[0036] When this utility model is in use, after the pressure relief state ends, electromagnet YV2 continues to be energized, and electromagnet YV5 is energized. The output end of servo motor 1 drives oil pump 2 to rotate forward. Oil pump 2 draws hydraulic oil from oil tank 14 through the PA port of three-position four-way proportional solenoid valve 7, and flows to the lower chamber oil port of oil cylinder 10 through solenoid valve 6. At the same time, hydraulic oil flows out of the upper chamber oil port of oil cylinder 10 and returns to oil tank 14 through two-position two-way solenoid valve 9, so that oil cylinder 10 drives the slide plate to return.

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

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

[0039] When this utility model is in use, the first throttling damper 11, the second throttling damper 12, and the third throttling damper 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 stability of the hydraulic oil flow; the pressure value is displayed by an external pressure gauge to monitor the pressure of the system.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made in accordance with the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. A hydraulic system for an electro-hydraulic CNC synchronous bending machine that does not require fluid filling, characterized in that: Includes 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 upper chamber oil port of the oil cylinder (10). (8) The T port 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 electromagnet one (YV1) and electromagnet two (YV2), the solenoid valve (6) includes electromagnet three (YV3), the two-position four-way solenoid valve (8) includes electromagnet four (YV4), and the two-position two-way solenoid valve (9) includes electromagnet five (YV5); the servo motor (1) is energized but not enabled, and the hydraulic system is in standby mode.

2. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: When the servo motor (1) is powered on, electromagnets one (YV1), three (YV3) and four (YV4) are powered on, and the hydraulic system is in a fast-down state.

3. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: When the servo motor (1) is energized, the electromagnet (YV1) is energized, and the hydraulic system is in the working state.

4. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: The servo motor (1) is energized and its speed is adjusted. Electromagnet one (YV1) is energized, and the hydraulic system is in a pressure-holding state.

5. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: When the servo motor (1) is energized, the electromagnet (YV2) is energized, and the hydraulic system is in a depressurized state.

6. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: When the servo motor (1) is energized, electromagnets two (YV2) and five (YV5) are energized, and the hydraulic system is in the return state.

7. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: The three-position four-way proportional solenoid valve (7) is configured as a slide valve type.

8. The hydraulic system of the electro-hydraulic CNC synchronous bending machine without the need for filling fluid as described in claim 1, characterized in that: It also includes throttling damper one (11), throttling damper two (12) and throttling damper three (13). The inlet of the first throttling damper (11) is connected to the lower chamber oil port of the cylinder (10), and the outlet of the first throttling damper (11) is connected to an external pressure measuring device. The inlet of the second throttling damper (12) is connected to the inlet of the main pressure relief valve (3), and the outlet of the second throttling damper (12) is connected to an external pressure measuring device. The inlet of the third throttling damper (13) is connected to the upper chamber oil port of the cylinder (10), and the outlet of the third throttling damper (13) is connected to an external pressure measuring device.

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