Automatic control valve in quick-change upper anvil hydraulic circuit

Abstract

The utility model relates to an automatic control valve in a quick-change upper anvil hydraulic circuit. A self-control valve is arranged on a hydraulic pipeline of a hydraulic power source quick-change upper anvil hydraulic cylinder set, a slidable valve element is arranged in the self-control valve, an oil cavity and a spring cavity are formed in the two ends of the valve element respectively, pressure oil in the oil cavity and a spring in the spring cavity clamp the valve element to slide, and the pressure of the pressure oil is adjusted through return stroke and idle stroke quick drop operation of a movable beam; and in combination with the functions of high-pressure closing and low-pressure opening of the self-control valve, the purpose of fully automatically and quickly assembling and disassembling the upper anvil is achieved. The utility model has the advantages of novel design, high automation degree, stable and flexible control and the like.

Description

Technical Field

[0001] This utility model relates to a hydraulic control valve, specifically to a self-control valve in a hydraulic circuit for quick loading and unloading of anvils that automatically switches on and off according to pressure changes, belonging to the field of hydraulic equipment design and manufacturing technology. Background Technology

[0002] To facilitate the rapid loading and unloading of the anvil on a large hydraulic forging machine, Chinese Patent Application No. 202411582263.8 discloses a device and operating method for rapid loading and unloading of the anvil. The device uses a positioning wedge pin consisting of a tenon and a movable wedge pin. The movable wedge pin is placed in the wedge pin hole of the connecting rod, allowing for quick loading and unloading of the anvil by tightening and loosening the wedge. This also significantly reduces the wedge pin stroke, resulting in a smaller space footprint for the rapid loading and unloading device, easier equipment layout, and reduced energy consumption. To facilitate hydraulic power input, Chinese Patent No. 201710174377.2 discloses a hydraulic circuit and oil supply method for locking the anvil seat on a hydraulic forging machine. An internal flow hole is provided between the oil chamber of the return hydraulic cylinder and the movable beam. One end of the hole is connected to the oil inlet chamber of the hydraulic cylinder, and the other end is connected to a connecting pipe via a piston rod. The other end of the connecting pipe is connected to the hydraulic cylinder of the rapid loading and unloading device, enabling synchronous movement of the oil pipeline of the rapid loading and unloading device and the movable beam. Even with the combined application of the two technologies mentioned above, there are still some shortcomings: when quickly removing the anvil, after the wedge pin is removed, the fixing nut must be manually operated to fix the wedge pin, and then the pressure must be manually released; when quickly installing the anvil, multiple manual operations are still required. In order to further improve work efficiency and achieve automated operation, the existing liquid supply circuit needs to be improved with automatic control. Summary of the Invention

[0003] This utility model proposes a self-control valve in the hydraulic circuit of quick-change anvil. A high-pressure shut-off and low-pressure open self-control valve is set on the hydraulic pipeline between the hydraulic power source and the quick-change device to realize automatic and rapid anvil replacement on the forging machine.

[0004] To achieve the above objectives, this utility model proposes a self-control valve in a quick-change anvil hydraulic circuit, comprising: a quick-forging machine and a quick-installation and quick-discharge mechanism. The quick-forging machine includes a movable beam, a forging cylinder, a return cylinder, an upper anvil seat, and an upper anvil. During the return operation of the quick-forging machine, the pressure of the oil in the return cylinder increases; during the quick-down operation of the quick-forging machine, the pressure of the oil in the return cylinder decreases. The quick-installation and quick-discharge mechanism includes a hydraulic circuit and a drive assembly. The drive assembly includes a hydraulic cylinder group and a wedge pin. A return spring is installed in the rodless chamber of one hydraulic cylinder in the hydraulic cylinder group. The wedge pin includes a tenon and a movable wedge pin. The plunger of the forging cylinder and the single rod of the return cylinder are connected to the movable beam. The upper anvil seat is fixed below the movable beam. The single rod of the return cylinder and the movable beam are provided with built-in flow holes. The hydraulic cylinder group drives the wedge pin to disengage the connecting rod on the upper anvil from the positioning hole in the upper anvil seat or to tighten the connecting pin. Its characteristics are:

[0005] The hydraulic circuit includes a hydraulic power source, a switching valve, a self-control valve, hydraulic pipelines, and the hydraulic cylinder assembly;

[0006] The hydraulic power source is set as the pressure oil in the rod chamber of the return cylinder to provide pressure oil to the hydraulic cylinder group;

[0007] The switching valve is installed on the pipeline between the built-in flow passage and the self-control valve;

[0008] The self-control valve includes a valve body and a valve core. The valve core is placed in the inner cavity of the valve body and divides the inner cavity into an oil cavity, an oil hole cavity, and a spring cavity. There are two oil hole cavities. The oil cavity and the spring cavity are located at both ends of the valve core. Pressurized oil is introduced into the oil cavity, and a spring is installed in the spring cavity. The pressurized oil and the spring clamp the valve core and slide it in the inner cavity of the valve body.

[0009] The automatic control valve is set with a fully closed working pressure and a fully open working pressure. When the pressure oil pressure reaches the fully closed working pressure, the automatic control valve is fully closed. When the pressure oil pressure drops to the fully open working pressure, the automatic control valve is fully open.

[0010] When the pressure of the oil is greater than the spring force, the valve core slides into the spring cavity, and the pressure of the oil rises to the fully closed working pressure, the self-control valve is fully closed.

[0011] When the pressure of the oil is less than the spring force, the valve core slides into the oil chamber, the pressure of the oil drops to the fully open working pressure, and the self-control valve is fully open.

[0012] The valve body of the self-control valve is provided with a first, second and third oil inlet and outlet ports. The first oil inlet and outlet port is connected to the oil chamber, and the second and third oil inlet and outlet ports are respectively connected to an oil hole.

[0013] The hydraulic pipeline consists of the built-in flow passage and the connecting pipe. One end of the built-in flow passage is connected to the rod chamber of the return cylinder, and the other end is connected to one end of the connecting pipe. The other end of the connecting pipe is connected to the first oil inlet / outlet and the second or third oil inlet / outlet, respectively. Correspondingly, the third or second oil inlet / outlet is connected to the hydraulic cylinder of the hydraulic cylinder group.

[0014] Preferably, the working pressure for closing the automatic control valve is set at ≥10 MPa, and the working pressure for opening the automatic control valve is set at ≤5 MPa.

[0015] Preferably, the working pressure for closing the self-control valve is set at ≥10 MPa, and the working pressure for opening is set at ≤5 MPa.

[0016] This invention controls the oil chamber pressure of the self-regulating valve by operating the forging machine during the return and idle strokes. By changing the oil chamber pressure, the opening and closing of the self-regulating valve is adjusted to ensure that the wedge pin can be smoothly withdrawn and inserted into the wedge pin hole under complex working conditions. The self-regulating valve's high-pressure closing and low-pressure opening function is used to achieve the purpose of quick installation and removal of the anvil.

[0017] This utility model has the advantages of novel design, high degree of automation, and stable and flexible operation. Attached Figure Description

[0018] Appendix Figure 1 This is a front sectional view of the present invention.

[0019] Appendix Figure 2 The diagram shows the fully open state of the self-control valve when the pressure oil pressure is less than or equal to the fully open working pressure when the anvil is removed.

[0020] Appendix Figure 3 The diagram illustrates the partial opening and closing states of the automatic control valve, showing that the oil pressure is greater than the fully open working pressure but less than the fully closed working pressure when the anvil is removed.

[0021] Appendix Figure 4 A schematic diagram showing the fully closed state of the automatic control valve when the pressure oil pressure is greater than or equal to the fully closed working pressure during anvil removal.

[0022] Appendix Figure 5 This diagram illustrates the fully closed state of the automatic control valve after the upper anvil disengages from its seat and the oil pressure exceeds the fully closed working pressure.

[0023] Appendix Figure 6 The diagram shows the fully open state of the automatic control valve when the pressure of the hydraulic oil is less than or equal to the fully open working pressure during the retraction process.

[0024] Appendix Figure 7 A schematic diagram showing the fully closed state of the automatic control valve when the pressure of the pressure oil after the pin is removed is greater than or equal to the fully closed working pressure.

[0025] Appendix Figure 8 A schematic diagram showing the fully closed state of the self-regulating valve when the pressure oil pressure is greater than or equal to the fully closed working pressure after the anvil is installed.

[0026] Appendix Figure 9 The diagram shows the partial opening and closing states of the self-regulating valve, where the oil pressure is lower than the fully closed working pressure but higher than the fully open working pressure when the anvil is installed.

[0027] Appendix Figure 10 This diagram shows the fully open state of the self-control valve when the pressure of the pressure oil is less than or equal to the fully open working pressure after the upper anvil and upper anvil seat are connected.

[0028] In the attached diagram, 1 is the upper anvil, 101 is the connecting rod, 2 is the upper anvil seat, 201 is the positioning hole, 3 is the hydraulic cylinder assembly, 301 is the tenon, 302 is the movable wedge pin, 4 is the self-control valve, 5 is the valve core, 6 is the return cylinder, 7 is the oil pipeline, 8 is the spring, 9 is the switching valve, A and P are oil holes, B is the oil chamber, and a is the oil pipeline connection port. Detailed Implementation

[0029] As attached Figure 1 As shown, the pressure oil in the return cylinder 6 of the forging machine is used as the hydraulic power source of the hydraulic cylinder group 3. The switching valve 9 is set between the return cylinder 6 and the self-control valve 4. The hydraulic pipeline consists of the built-in flow passage hole and oil pipeline 7 provided in the return cylinder plunger and the movable beam. In the figure, a is the connection port of oil pipeline 7.

[0030] The self-regulating valve 4 has a valve core 5 inside its cavity, which divides the cavity into an oil chamber B, oil holes A and P, and a spring chamber. The oil chamber B and spring chamber are located at opposite ends of the valve core 5. A spring 8 is installed in the spring chamber. The pressure oil in the oil chamber B, along with the spring 8, clamps the valve core 5, causing it to slide. When the pressure oil in the oil chamber B exceeds the spring force of the spring 8, the spring 8 is compressed, and the valve core 5 slides into the spring chamber. When the oil pressure in the oil chamber B reaches the fully closed working pressure, the spring 8 is compressed until oil holes A and P are not connected, and the self-regulating valve 4 is completely closed. When the pressure oil in the oil chamber B is less than the spring force of the spring 8, the spring 8 extends, and the valve core 5 slides into the oil chamber B. When the oil pressure in the oil chamber B reaches the fully opened working pressure, the spring 8 extends until oil holes A and P are connected, and the self-regulating valve 4 is fully open. The valve body of the self-regulating valve 4 has three inlet and outlet ports, which are respectively connected to the oil chamber B and oil holes A and P.

[0031] When quickly unloading the anvil 1, use the attached... Figure 2 , 3 The operation procedures shown in 4 and 5 are attached. Figure 2 As shown, first, the switch valve 9 is opened, and the pressurized oil in the oil chamber of the return cylinder 6 pushes the tenon 301 and the movable wedge pin 302 through the hydraulic cylinder assembly. The forging machine is operated to perform multiple short return strokes and rapid descents without lifting the movable beam. The hydraulic oil in the return cylinder 6 is frequently pressurized and depressurized, and the hydraulic cylinder assembly 3 frequently pushes the tenon 301 and the movable wedge pin 302. The connection between oil holes A and P and the positional relationship of the tenon 301 and the movable wedge pin 302 are gradually transformed into an attached... Figure 3 As shown, it is eventually transformed into an appendix. Figure 4 The state shown. (In the attached...) Figure 4 Continue the above operation in the state, control the moving beam to shake and gradually rise, the connecting rod 101 disengages from the positioning hole 201 on the upper anvil seat 2, the upper anvil 1 leaves the upper anvil seat 2, and the upper anvil 1 is quickly unloaded.

[0032] One implementation of the quick-installation anvil method involves closing the switch valve 9 after unloading the anvil 1. Figure 6 ,7 The operating procedures shown in 8, 9, and 10 are as follows: First, open switch valve 9, and attach... Figure 6 In the indicated state, multiple short return and quick descent operations are performed, keeping the position of the movable beam unchanged. The pressurized oil in the oil chamber of the return cylinder 6 passes through the hydraulic cylinder group 3, compressing the return spring. When the pressurized oil pressure reaches the fully closed working pressure, the self-control valve 4 is fully closed, converting to an auxiliary... Figure 7 The state is shown in the attached document. Figure 8 As shown, insert the connecting rod 101 into the positioning hole 201. With the self-control valve 4 fully closed, repeat the idle rapid descent and return operations, controlling the movable beam to vibrate and gradually descend. In special cases, simultaneously operate the forging cylinder to press down, making the upper anvil 1 fit with the upper anvil seat 2. Then perform the idle rapid descent operation, entering the attached... Figure 9 As shown, the self-control valve 4 gradually opens to drain oil. The return spring pushes the tenon 301 and the movable wedge pin 302 to connect the connecting rod 101 with the positioning hole 201. When the pressure oil pressure is less than or equal to the fully open working pressure, the tenon 301 and the movable wedge pin 302 connect the connecting rod 101 with the positioning hole 201 in place, completing the quick installation of the upper anvil and achieving the attached... Figure 10 In the state shown, close the switch valve 9.

[0033] Another implementation of the quick-release anvil method involves entering the attachment after the quick-release anvil 1 is completed. Figure 5 After reaching the desired state, directly install the anvil, insert the connecting rod 101 into the positioning hole 201, and proceed into the attached... Figure 8 The state shown, the following Figure 8 , 9 The actions shown in 10 are the same as the first method.

Claims

1. A self-regulating valve in a quick-change anvil hydraulic circuit, comprising: A high-speed forging machine and a quick-assembly and quick-disassembly mechanism are disclosed. The high-speed forging machine includes a movable beam, a forging cylinder, a return cylinder, an upper anvil seat, and an upper anvil. During the return operation of the high-speed forging machine, the pressure of the oil in the return cylinder increases; during the no-stroke quick-down operation of the high-speed forging machine, the pressure of the oil in the return cylinder decreases. The quick-assembly and quick-disassembly mechanism includes a hydraulic circuit and a drive assembly. The drive assembly includes a hydraulic cylinder group and a wedge pin. A return spring is installed in the rodless chamber of one hydraulic cylinder in the hydraulic cylinder group. The wedge pin includes a tenon and a movable wedge pin. The plunger of the forging cylinder and the single rod of the return cylinder are connected to the movable beam. The upper anvil seat is fixed below the movable beam. The single rod of the return cylinder and the movable beam are provided with built-in flow holes. The hydraulic cylinder group drives the wedge pin to disengage the connecting rod on the upper anvil from the positioning hole in the upper anvil seat or to tighten the connecting pin. The mechanism is characterized by: The hydraulic circuit includes a hydraulic power source, a switching valve, a self-control valve, hydraulic pipelines, and the hydraulic cylinder assembly; The hydraulic power source is set as the pressure oil in the rod chamber of the return cylinder to provide pressure oil to the hydraulic cylinder group; The switching valve is installed on the pipeline between the built-in flow passage and the self-control valve; The self-control valve includes a valve body and a valve core. The valve core is placed in the inner cavity of the valve body and divides the inner cavity into an oil cavity, an oil hole cavity, and a spring cavity. There are two oil hole cavities. The oil cavity and the spring cavity are located at both ends of the valve core. Pressurized oil is introduced into the oil cavity, and a spring is installed in the spring cavity. The pressurized oil and the spring clamp the valve core and slide it in the inner cavity of the valve body. The automatic control valve is set with a fully closed working pressure and a fully open working pressure. When the pressure oil pressure reaches the fully closed working pressure, the automatic control valve is fully closed. When the pressure oil pressure drops to the fully open working pressure, the automatic control valve is fully open. When the pressure of the oil is greater than the spring force, the valve core slides into the spring cavity, and the pressure of the oil rises to the fully closed working pressure, the self-control valve is fully closed. When the pressure of the oil is less than the spring force, the valve core slides into the oil chamber, the pressure of the oil drops to the fully open working pressure, and the self-control valve is fully open. The valve body of the self-control valve is provided with a first, second and third oil inlet and outlet ports. The first oil inlet and outlet port is connected to the oil chamber, and the second and third oil inlet and outlet ports are respectively connected to an oil hole. The hydraulic pipeline consists of the built-in flow passage and the connecting pipe. One end of the built-in flow passage is connected to the rod chamber of the return cylinder, and the other end is connected to one end of the connecting pipe. The other end of the connecting pipe is connected to the first oil inlet / outlet and the second or third oil inlet / outlet, respectively. Correspondingly, the third or second oil inlet / outlet is connected to the hydraulic cylinder of the hydraulic cylinder group.

2. The self-regulating valve in a quick-change anvil hydraulic circuit according to claim 1, characterized in that: The working pressure for closing the automatic control valve is set at ≥10 MPa, and the working pressure for opening is set at ≤5 MPa.

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