Hydraulic system of electro-hydraulic numerical control synchronous bending machine

Abstract

The utility model discloses a hydraulic system of an electro-hydraulic numerical control synchronous bending machine, which belongs to the technical field of hydraulic systems, comprises a servo motor, a servo pump and an oil tank, and is characterized in that an output end of the servo motor is fixedly connected with a rotating part of the servo pump, and an oil suction port of the servo pump is communicated with an oil outlet of the oil tank; an oil discharge port of the servo pump is connected with two groups of hydraulic speed regulating systems; the two groups of hydraulic speed regulating systems are connected with an oil return port of the oil tank; the hydraulic speed regulating system comprises a main pressure overflow valve, a proportional reversing valve, a safety valve, a back pressure valve, a quick descending valve, a first two-position four-way reversing valve, a second two-position four-way reversing valve, a prefill valve, a speed increasing oil cylinder, a first throttling hole and a second throttling hole. Adjustment of two working modes of the hydraulic system is achieved so as to adapt to different working condition requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic system of an electro-hydraulic numerically controlled synchronous bending machine. Background Art

[0002] As one of the indispensable equipment in the sheet metal manufacturing industry, the quality of the electro-hydraulic CNC bending machine depends on the control accuracy of the machine tool, and the production efficiency depends on the speed of the machine tool.

[0003] Each cycle of a modern CNC bending machine can be divided into six stages: rapid descent, working feed, pressure maintenance, pressure relief, return stroke, and stop. The pressure and speed provided to the hydraulic system vary during each operating stage. During the rapid descent, the slide of a traditional CNC bending machine relies solely on its own weight to descend, resulting in a slow speed and a long cycle time. During the working feed, the feed speed cannot be adjusted based on changes in working conditions, resulting in low efficiency.

[0004] Therefore, the traditional electro-hydraulic CNC synchronous bending machine has low efficiency in the entire cycle mode compared to the dual-speed working mode hydraulic system of the electro-hydraulic CNC synchronous bending machine.

[0005] Based on this, the utility model designs a hydraulic system of an electro-hydraulic CNC synchronous bending machine to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a hydraulic system for an electro-hydraulic numerically controlled synchronous bending machine.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A hydraulic system for an electro-hydraulic CNC synchronous bending machine includes a servo motor, a servo pump, and an oil tank. The output end of the servo motor is fixedly connected to the rotating part of the servo pump. The oil suction port of the servo pump is connected to the oil outlet of the oil tank. The oil discharge port of the servo pump is connected to two sets of hydraulic speed control systems. The two sets of hydraulic speed control systems are both connected to the oil return port of the oil tank.

[0009] The hydraulic speed control system includes a main pressure relief valve, a proportional reversing valve, a safety valve, a back pressure valve, a quick-down valve, a two-position four-way reversing valve 1, a two-position four-way reversing valve 2, a filling valve, a booster oil cylinder, a throttle hole 1 and a throttle hole 2;

[0010] The oil discharge port of the servo pump is connected to the proportional reversing valve and the main pressure relief valve;

[0011] The proportional reversing valve is connected to the oil tank, the quick-down valve, the main pressure relief valve, the second two-position four-way reversing valve, the first two-position four-way reversing valve, and the booster cylinder, and the main pressure relief valve is connected to the second two-position four-way reversing valve and the oil tank;

[0012] The lower chamber oil port of the booster cylinder is connected to the throttle hole 2, the throttle hole 1, the oil tank, the safety valve, and the filling valve. The upper chamber oil port of the booster cylinder is connected to the two-position four-way reversing valve 1, the filling valve, the oil tank, and the proportional reversing valve. The filling valve is connected to the main pressure relief valve, the oil tank, the two-position four-way reversing valve 2, and the two-position four-way reversing valve 1.

[0013] The throttle hole 2 is connected with the safety valve, the quick-down valve, the back pressure valve and the throttle hole 1.

[0014] Furthermore, the quick-release valve is provided with an electromagnet YV1 for controlling its closing.

[0015] Furthermore, the proportional reversing valve is provided with four ports A, B, P, and T. The proportional reversing valve is also provided with an electromagnet YV3 and an electromagnet YV4 for controlling the connection between its A port and P port and T port, and between its B port and A port and T port.

[0016] Furthermore, the two-position four-way reversing valve 1 and the two-position four-way reversing valve 2 have the same structure and are both provided with four ports A, B, P, and T. The two-position four-way reversing valve 1 is provided with an electromagnet YV2 for controlling the connection between its A port and P port, T port, and B port and A port, T port; the two-position four-way reversing valve 2 is provided with an electromagnet YV5 for controlling the connection between its A port and P port, T port, and B port and A port, T port.

[0017] Furthermore, the A port of the proportional reversing valve is connected to the back pressure valve and the quick-down valve through a pipeline, the B port of the proportional reversing valve is connected to the upper chamber oil port of the booster cylinder, the P port of the two-position four-way reversing valve one, and the B port of the two-position four-way reversing valve one, the P port of the proportional reversing valve is connected to the oil discharge port of the servo pump, the T port of the proportional reversing valve is connected to the safety valve, the main pressure relief valve, the T port of the two-position four-way reversing valve two, and the filling valve through a pipeline, the B port of the two-position four-way reversing valve one is connected to the upper chamber oil port of the booster cylinder, the B port of the two-position four-way reversing valve two is connected to the filling valve, and the T port of the two-position four-way reversing valve two is connected to the filling valve and the oil tank.

[0018] Compared with the existing technology, the present invention has the following beneficial effects: 1. When the present invention is used, the hydraulic system of the electro-hydraulic CNC synchronous bending machine enables the CNC bending machine slide to accelerate during the fast-down process, greatly improving the working speed within the small load range, shortening the single cycle time, and improving work efficiency. The bending force requirement is guaranteed under the standard mode working condition, and the bending speed requirement is met under the fast mode working condition.

[0019] 2. When the utility model is used, the oil flow is controlled by the throttle hole 1 and the throttle hole 2, thereby preventing the system from being impacted by excessive flow.

[0020] 3. When the present invention is used, a relatively large pressure is required to control the machine tool. The safety valve is set to the maximum pressure that the lower chamber of the speed-increasing oil cylinder 11 can withstand. The back pressure valve is set to enable the machine tool to achieve stationary slide in any non-pressurized working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0022] Figure 1 This is a schematic diagram of the hydraulic system of an electro-hydraulic CNC synchronous bending machine of the present utility model;

[0023] Figure 2 Schematic diagram of the proportional reversing valve of the utility model;

[0024] Figure 3 This is a schematic diagram of the quick-release valve of the present utility model;

[0025] Figure 4 Schematic diagram of a two-position four-way directional valve 1 and a two-position four-way directional valve 2 of the present invention;

[0026] Figure 5 A table schematic diagram of the standard mode of the present utility model;

[0027] Figure 6 This is a table diagram of the fast mode of the present utility model.

[0028] The numbers in the figure represent:

[0029] 1. Servo motor; 2. Servo pump; 3. Main pressure relief valve; 4. Proportional reversing valve; 5. Safety valve; 6. Back pressure valve; 7. Quick-down valve; 8. Two-position four-way reversing valve 1; 9. Two-position four-way reversing valve 2; 10. Filling valve; 11. Speed-increasing cylinder 11; 12. Throttle hole 1; 13. Throttle hole 2; 14. Fuel tank 14. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0032] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-6 A hydraulic system of an electro-hydraulic CNC synchronous bending machine includes a servo motor 1, a servo pump 2 and an oil tank 14. The output end of the servo motor 1 is fixedly connected to the rotating part of the servo pump 2. The oil suction port of the servo pump 2 is connected to the oil outlet of the oil tank 14. The oil discharge port of the servo pump 2 is connected to two sets of hydraulic speed control systems. Both sets of hydraulic speed control systems are connected to the oil return port of the oil tank 14.

[0033] The hydraulic speed control system includes a main pressure relief valve 3, a proportional reversing valve 4, a safety valve 5, a back pressure valve 6, a quick-down valve 7, a two-position four-way reversing valve 1 8, a two-position four-way reversing valve 2 9, a charging valve 10, a booster cylinder 11, a throttle hole 1 12, and a throttle hole 2 13;

[0034] The oil discharge port of the servo pump 2 is connected to the proportional reversing valve 4 and the main pressure relief valve 3;

[0035] The proportional reversing valve 4 is connected to the oil tank 14, the quick-down valve 7, the main pressure relief valve 3, the two-position four-way reversing valve 2 9, the two-position four-way reversing valve 1 8, and the booster cylinder 11. The main pressure relief valve 3 is connected to the two-position four-way reversing valve 2 9 and the oil tank 14;

[0036] The lower oil port of the boost cylinder 11 is connected to the throttle hole 2 13, the throttle hole 12, the safety valve 5, the back pressure valve 6, and the quick-down valve 7. The upper oil port of the boost cylinder 11 is connected to the two-position four-way reversing valve 1 8, the charging valve 10, the oil tank 14, and the proportional reversing valve 4. The charging valve 10 is connected to the main pressure relief valve 3, the oil tank 14, the two-position four-way reversing valve 2 9, and the two-position four-way reversing valve 1 8.

[0037] The second throttle hole 13 is connected to the safety valve 5, the quick-down valve 7, the back pressure valve 6, and the throttle hole 12.

[0038] When the utility model is used, the hydraulic system of the electro-hydraulic CNC synchronous bending machine enables the CNC bending machine slide to achieve accelerated movement during the fast-down process, greatly improving the working speed within the small load range, shortening the single cycle time, and improving work efficiency. In the standard mode working condition, the bending force requirement is guaranteed, and in the fast mode working condition, the bending speed requirement is met.

[0039] A slide plate is fixedly mounted on the output end of the speed increasing cylinder 11 .

[0040] Embodiment 2: In some embodiments, as Figures 1-6 As shown, as a preferred embodiment of the present utility model, the quick-down valve 7 is provided with an electromagnet YV1 for controlling its closing;

[0041] The proportional reversing valve 4 is provided with four ports A, B, P, and T. The proportional reversing valve 4 is also provided with an electromagnet YV3 and an electromagnet YV4 for controlling the communication between its A port and P port and T port, and between its B port and A port and T port;

[0042] The two-position four-way reversing valve 1 8 and the two-position four-way reversing valve 2 9 have the same structure and are both provided with four ports A, B, P, and T. The two-position four-way reversing valve 1 8 is provided with an electromagnet YV2 for controlling the communication between its A port and the P port and the T port, and between its B port and the A port and the T port. The two-position four-way reversing valve 2 9 is provided with an electromagnet YV5 for controlling the communication between its A port and the P port and the T port, and between its B port and the A port and the T port.

[0043] The A port of the proportional reversing valve is connected to the back pressure valve and the quick-down valve via a pipeline. The B port of the proportional reversing valve is connected to the upper chamber oil port of the booster cylinder and the P port of the two-position four-way reversing valve. The P port of the proportional reversing valve is connected to the oil discharge port of the servo pump and the main pressure relief valve. The T port of the proportional reversing valve is connected to the safety valve, the main pressure relief valve, the T port of the two-position four-way reversing valve, and the charging valve via a pipeline. The B port of the two-position four-way reversing valve is connected to the upper chamber oil port of the booster cylinder, the B port of the two-position four-way reversing valve is connected to the charging valve, and the T port of the two-position four-way reversing valve is connected to the charging valve and the oil tank. When the utility model is in use, the oil circuit flow is controlled through the throttle hole 1 and the throttle hole 2, thereby preventing excessive flow from impacting the system.

[0044] When the utility model is used, a larger pressure is required to control the machine tool. The safety valve 5 is set to the maximum pressure that the lower chamber of the speed-increasing oil cylinder 11 can withstand. The back pressure valve 6 is closed to make the slide of the machine tool stationary in any non-pressurized working condition.

[0045] Embodiment 3: In some embodiments, as Figures 1-6 As shown, as a preferred embodiment of the present utility model, the following steps are also included: having a standard mode and a fast mode;

[0046] The standard mode uses the following control steps:

[0047] Step 1, fast down: electromagnets YV1 and YV4 are energized, servo motor 1 drives servo pump 2 to rotate, servo pump 2 oil suction port is connected to oil tank 14, main pressure oil flows to P-B port of proportional reversing valve 4 without exceeding the pressure setting of main pressure relief valve 3, and flows from port B to the upper chamber of speed-increasing oil cylinder 11; the oil port of the lower chamber of speed-increasing oil cylinder 11 flows back to oil tank 14 through quick down valve 7-port A-port of proportional reversing valve 4-port T, charging valve 10 is normally open, and under the action of the deadweight of slide plate, speed-increasing oil cylinder 11 quickly absorbs oil from oil tank 14 and flows through charging valve 10;

[0048] Step 2, working feed: electromagnets YV2, YV4, and YV5 are energized, and the pressure oil is divided into three branches: the first flows to the P-B port of the proportional reversing valve 4, and flows from the B port to the upper chamber of the speed-increasing cylinder 11, playing the role of working feed of the upper chamber; the second flows to the two-position four-way reversing valve 1 8, through the P-B-speed-increasing cylinder 11 upper chamber, playing the role of working feed of the speed-increasing cylinder 11 upper chamber; the third branch flows to the two-position four-way reversing valve 2 9, P-B-filling valve 10, and closes the filling valve 10; the lower chamber of the speed-increasing cylinder 11 flows back to the oil tank 14 through the back pressure valve 6-the A port-T port of the proportional reversing valve 4, and finally flows to the oil tank 14; the machine tool moves downward quickly;

[0049] Step 3, pressure maintenance: the same as step 2; only the speed and torque of the servo motor 1 need to be adjusted to achieve pressure maintenance.

[0050] Step 4, pressure relief: electromagnets YV2, YV3, and YV5 are energized, and the pressure oil in the upper chamber of the speed-increasing cylinder 11 flows in the reverse direction through the two-position four-way reversing valve 18 and the A port to the T port of the proportional reversing valve 4 and flows back to the oil tank 14. At the same time, the pressure oil in the upper chamber of the speed-increasing cylinder 11 flows in the reverse direction through the A port to the T port of the proportional reversing valve 4 and flows back to the oil tank 14. The filling valve 10 controls the pressure oil flow to flow in the reverse direction through the two-position four-way reversing valve 2 9 and flows from B to T to the oil tank 14. The filling valve 10 is opened to connect the upper chamber of the speed-increasing cylinder 11 with the oil tank 14, and the pressure oil flows back to the oil tank 14. At this time, the pressure relief working condition of the upper chamber of the speed-increasing cylinder 11 is completed.

[0051] Step 5, return stroke: electromagnet YV3 is energized. At this time, the pressure oil only flows through the P-A of the proportional reversing valve 4-the quick lower valve 7-the lower chamber of the speed-increasing cylinder 11, the upper chamber of the speed-increasing cylinder 11-the filling valve 10-the oil tank 14. At this time, the lower chamber of the speed-increasing cylinder 11 increases the speed of the servo motor 1 under the action of the pressure oil, which can increase the return speed of the machine tool;

[0052] Step 6: Stop: All electromagnets are de-energized, servo motor 1 stops rotating, and the machine tool is in a stationary state.

[0053] Fast mode uses the following control steps:

[0054] Step 1: Fast lowering: Electromagnet YV4 is energized, and servo motor 1 drives servo pump 2. The servo pump 2's oil intake is connected to oil tank 14. Main pressure oil, provided it does not exceed the pressure setting of main pressure relief valve 3, flows to ports P-B of proportional directional valve 4. From port B, it flows to the upper chamber of accelerating cylinder 11, accelerating cylinder 11's rapid lowering speed. The oil in the lower chamber of accelerating cylinder 11 flows back through back pressure valve 6, ports A-T of proportional reversing valve 4, and then back to oil tank 14, thereby achieving the rapid lowering effect of the machine tool. The rapid lowering speed is determined by the speed of servo motor 1.

[0055] Step 2: Working Feed: Electromagnet YV4 is energized, causing pressurized oil to flow to ports P-B of proportional directional valve 4, from port B to the upper chamber of accelerating cylinder 11, continuing to function as working feed. The lower chamber of accelerating cylinder 11 flows back through back-pressure valve 6, ports A-T of proportional reversing valve 4, and finally to tank 14. The working feed speed at this point is determined by the speed of servo motor 1. This working feed speed is activated within a specific low-load range, using only the upper chamber of accelerating cylinder 11 as the actuator for power output, for improved efficiency.

[0056] Step 3, pressure maintenance: the same as step 2; only the speed and torque of the servo motor 1 need to be adjusted to achieve pressure maintenance.

[0057] Step 4, pressure relief: electromagnet YV3 is energized, and the pressure oil in the upper chamber of the speed-increasing cylinder 11 flows in the opposite direction through the A port to the T port of the proportional reversing valve 4 and flows back to the oil tank 14; at this time, the upper chamber reaches the unloading condition.

[0058] Step 5, return stroke: electromagnet YV3 is energized, and the pressure oil only flows through P-A of the proportional reversing valve 4-quick lower valve 7-lower chamber of the speed-increasing cylinder 11, the upper chamber of the speed-increasing cylinder 11-filling valve 10-oil tank 14. At this time, the lower chamber of the speed-increasing cylinder 11 drives the piston to return under the action of pressure oil; the return speed of the machine tool can be increased.

[0059] Step 6: Stop: All electromagnets are de-energized, and servo motor 1 stops rotating. The machine tool is in a stationary state.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic system for an electro-hydraulic numerically controlled synchronous bending machine, comprising a servo motor (1), a servo pump (2) and an oil tank (14), characterized in that: The output end of the servo motor (1) is fixedly connected to the rotating part of the servo pump (2), the oil suction port of the servo pump (2) is connected to the oil outlet of the oil tank (14), and the oil discharge port of the servo pump (2) is connected to two sets of hydraulic speed control systems, and the two sets of hydraulic speed control systems are both connected to the oil return port of the oil tank (14); The hydraulic speed regulating system comprises a main pressure relief valve (3), a proportional reversing valve (4), a safety valve (5), a back pressure valve (6), a quick-down valve (7), a two-position four-way reversing valve 1 (8), a two-position four-way reversing valve 2 (9), a filling valve (10), a speed increasing oil cylinder (11), a throttle hole 1 (12) and a throttle hole 2 (13); The oil discharge port of the servo pump (2) is connected to the proportional reversing valve (4) and the main pressure relief valve (3); The proportional reversing valve (4) is connected to the oil tank (14), the quick-down valve (7), the main pressure relief valve (3), the throttle hole 1 (12), the throttle hole 2 (13), the two-position four-way reversing valve 2 (9), the two-position four-way reversing valve 1 (8), and the speed-increasing oil cylinder (11); the main pressure relief valve (3) is connected to the two-position four-way reversing valve 2 (9) and the oil tank (14); The lower cavity oil port of the back pressure valve (6) is connected to the throttle hole 2 (13), the throttle hole 1 (12), the oil tank (14), the safety valve (5), the filling valve (10), and the two-position four-way reversing valve 1 (8); the upper cavity oil port of the back pressure valve (6) is connected to the two-position four-way reversing valve 1 (8), the filling valve (10), the oil tank (14), the proportional reversing valve (4), the throttle hole 1 (12), the two-position four-way reversing valve 2 (9), the proportional reversing valve (4), the main pressure relief valve (3), and the lower cavity oil port of the back pressure valve (6); the filling valve (10) is connected to the main pressure relief valve (3), the oil tank (14), the two-position four-way reversing valve 2 (9), and the two-position four-way reversing valve 1 (8); The second throttle hole (13) is connected to the safety valve (5), the quick-down valve (7), the back pressure valve (6), and the first throttle hole (12).

2. The hydraulic system of the electro-hydraulic CNC synchronous bending machine according to claim 1 is characterized in that: The quick-down valve (7) is provided with an electromagnet YV1 for controlling the closing thereof.

3. The hydraulic system of the electro-hydraulic CNC synchronous bending machine according to claim 2 is characterized in that: The proportional reversing valve (4) is provided with four ports, namely A, B, P and T. The proportional reversing valve (4) is also provided with an electromagnet YV3 and an electromagnet YV4 for controlling the communication between the A port and the P port and the T port, and between the B port and the A port and the T port.

4. The hydraulic system of the electro-hydraulic CNC synchronous bending machine according to claim 3 is characterized in that: The two-position four-way reversing valve 1 (8) and the two-position four-way reversing valve 2 (9) have the same structure and are both provided with four ports A, B, P and T. The two-position four-way reversing valve 1 (8) is provided with an electromagnet YV2 for controlling the communication between its A port and P port and T port, and between its B port and A port and T port. The two-position four-way reversing valve 2 (9) is provided with an electromagnet YV3 for controlling the communication between its A port and P port and T port, and between its B port and A port and T port.

5. The hydraulic system of the electro-hydraulic CNC synchronous bending machine according to claim 4 is characterized in that: The A port of the proportional reversing valve (4) is connected to the back pressure valve (6) and the quick-down valve (7) through a pipeline. The B port of the proportional reversing valve (4) is connected to the oil return port of the oil tank (14), the upper chamber oil port of the speed increasing oil cylinder (11), the P port of the two-position four-way reversing valve (8), the B port of the two-position four-way reversing valve (8), the P port of the two-position four-way reversing valve (9), the main pressure relief valve (3), the P port of the proportional reversing valve (4), the throttle hole (12), the throttle hole (13), and the oil discharge port of the servo pump (2). The P port of the proportional reversing valve (4) is connected to the servo pump (2). The oil discharge port of the pump (2) is connected, the T port of the proportional reversing valve (4) is connected to the safety valve (5), the main pressure relief valve (3), the T port of the two-position four-way reversing valve (9), and the filling valve (10) through a pipeline, the B port of the two-position four-way reversing valve (8) is connected to the upper chamber oil port of the speed-increasing cylinder (11), the oil return port of the oil tank (14), and the P port of the two-position four-way reversing valve (9), the B port of the two-position four-way reversing valve (9) is connected to the filling valve (10), and the T port of the two-position four-way reversing valve (9) is connected to the filling valve (10) and the oil tank (14).

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