Hydraulic control loop of floating shear
By designing a floating shear hydraulic control circuit including four hydraulic control circuits, the problem of the hydraulic control circuit in the prior art that the pressure cannot be slowly relieved when the strip is sheared, the upper shear blade cannot be fully opened, and the shear speed is difficult to adjust, and a more stable and efficient production process is achieved.
Patent Information
- Application Number
- CN202422082941.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-27
AI Technical Summary
When the hydraulic control circuit of the existing floating shear device is shearing the strip, the piston cavity pressure cannot be slowly relieved, resulting in violent vibration of the pipeline; when the unit is shut down, the upper shear blade cannot remain fully opened, causing a vacuum; the adjustment speed of the insertion of the check valve in the control circuit is limited, making it difficult to meet the shear speed standard.
A floating shear hydraulic control circuit including four hydraulic control circuits is designed. The pressure relief of the piston chamber is achieved through the newly added third hydraulic control circuit using the solenoid reversing valve C to ensure the slow release of pressure; when the unit is shut down, the upper shear blade is kept from falling through the design of the check valve and the solenoid reversing valve; the adjustment method of the plug-in check valve is optimized to improve the flexibility of the shear speed.
It effectively solves the problem of pipeline vibration caused by the inability to slowly relieve pressure of the piston chamber pressure in the hydraulic control circuit, ensures the stability of the upper shear blade when the unit is shut down, reduces the equipment maintenance volume, and improves production efficiency and the convenience and economy of the equipment.
Smart Images
Figure CN223035386U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydraulic control, and particularly discloses a hydraulic control circuit for a floating shear. Background Art
[0002] At present, during the hot rolling process of non-ferrous metals, it is necessary to shear the head, tail or waste of the material. The most commonly used shearing device is a floating shear, with a shearing thickness of 6 - 200 mm and a width of 400 - 2000 mm. As Figure 1 shown, in the prior art, the floating shear device shears in the following way: when a floating shear shearing command is issued, the electromagnetic directional valve B3 is energized, and the cartridge check valve C7 and the cartridge check valve A5 are opened simultaneously. The oil source of the proportional flow valve 1 enters the piston chamber of the oil cylinder A4 through the cartridge check valve C7. At the same time, the oil in the piston rod chamber of the oil cylinder A4 flows to the common oil port T1 of the valve platform through the cartridge check valve A5. The upper shear blade of the floating shear descends to clamp the strip, and then the lower shear blade rises until the strip is cut. At this time, the electromagnetic directional valve B3 is de-energized, and the cartridge check valve C7 and the cartridge check valve A5 are closed simultaneously, and the upper and lower shear blades remain stationary; when a floating shear opening command is issued, the electromagnetic directional valve A2 is energized, and the cartridge check valve B6 and the cartridge check valve D8 are opened simultaneously. The oil source of the proportional flow valve 1 enters the piston rod chamber of the oil cylinder A4 through the cartridge check valve B6. At the same time, the oil in the piston chamber of the oil cylinder A4 flows to the common oil port T1 of the valve platform through the cartridge check valve D8. The lower shear blade descends and the upper shear blade rises to open the floating shear. After opening in place, the electromagnetic directional valve A2 is de-energized, and the cartridge check valve B6 and the cartridge check valve D8 are closed simultaneously. After one shearing is completed, the proportional flow valve 1 is closed.
[0003] The floating shear device in the prior art has the following defects: 1. In the hydraulic control circuit of the floating shear device, when the strip is cut, the pressure in the piston chamber cannot be slowly relieved, resulting in violent vibration of the pipeline; 2. When the pump station is not started, the upper blade of the floating shear cannot be kept in the fully open position, resulting in the piston chamber of the shearing oil cylinder being prone to form a vacuum; 3. The control circuit selects the cartridge check valve D8. Although this valve can adjust the oil discharge speed of the piston chamber of the oil cylinder A4, that is, the opening speed of the shear blade, during on-site debugging, the cartridge check valve D8 cannot be adjusted very slowly, otherwise the shearing speed standard cannot be achieved. The existence of the above defects directly increases the user's maintenance volume after the equipment is put into operation, increases the regular maintenance cost, wastes the enterprise's financial and human resources, makes the production operation troublesome, and is not conducive to the convenience and economy of the user using the equipment. Summary of the Invention
[0004] In order to solve the problems in the background art, the utility model discloses a hydraulic control circuit for a floating shear, which includes four-way hydraulic control circuits, realizes pressure relief, meets the requirement that the upper shear blade does not descend when the unit stops, realizes the goal of reducing the maintenance volume of the daily floating shear pipeline, and improves the production efficiency.
[0005] To achieve the above-mentioned invention object, the following technical solutions are adopted in the utility model:
[0006] A floating shear hydraulic control circuit includes a cartridge check valve A, a cartridge check valve B, a cartridge check valve C, a cartridge check valve D, and an oil cylinder A for driving the upper and lower blades of the floating shear. It also includes a first to fourth hydraulic control circuit.
[0007] The first hydraulic control circuit includes a solenoid directional control valve A and a solenoid directional control valve B. The first hydraulic control circuit is used to control the opening and closing of the cartridge check valve A, the cartridge check valve B, the cartridge check valve C, and the cartridge check valve D.
[0008] The second hydraulic control circuit includes a proportional flow valve, a cartridge check valve C, and a cartridge check valve A. The second hydraulic control circuit is used to control the shearing and closing of the floating shear blade.
[0009] The third hydraulic control circuit includes a solenoid directional control valve C. The P port of the solenoid directional control valve C is connected to the piston chamber of the oil cylinder A, and the B port of the solenoid directional control valve C is connected to the piston rod chamber of the oil cylinder A. The third hydraulic control circuit is used to control the pressure relief of the piston chamber of the oil cylinder A.
[0010] The fourth hydraulic control circuit includes a cartridge check valve D and a cartridge check valve B. The fourth hydraulic control circuit is used to control the opening of the floating shear blade.
[0011] Further, in the floating shear hydraulic control circuit, the inlet of the proportional flow valve is connected to the oil source P1, the leakage port of the proportional flow valve is connected to the leakage oil L1, the outlet of the proportional flow valve is connected to the B port of the cartridge check valve C, the A port of the cartridge check valve C is connected to the piston chamber of the oil cylinder A, the piston rod chamber of the oil cylinder A is connected to the A port of the cartridge check valve A, and the B port of the cartridge check valve A is connected to the return oil T1.
[0012] Further, in the floating shear hydraulic control circuit, the B port of the cartridge check valve B is connected to the outlet of the proportional flow valve, the A port of the cartridge check valve B is connected to the piston rod chamber of the oil cylinder A, the piston chamber of the oil cylinder A is connected to the A port of the cartridge check valve D, and the B port of the cartridge check valve D is connected to the return oil T1.
[0013] Further, in the floating shear hydraulic control circuit, the P ports of the solenoid directional control valve A and the solenoid directional control valve B are connected to the oil source P1. A check valve is provided between the P ports of the solenoid directional control valve A and the solenoid directional control valve B and the oil source P1. The T ports of the solenoid directional control valve A and the solenoid directional control valve B are connected to the leakage oil L1. The A port of the solenoid directional control valve A is respectively connected to the control ports of the cartridge check valve B and the cartridge check valve D. The A port of the solenoid directional control valve B is respectively connected to the control ports of the cartridge check valve A and the cartridge check valve C.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] The hydraulic control circuit of the floating shear of the present utility model includes the first to fourth hydraulic control circuits. The newly added third hydraulic control circuit includes solenoid directional valve C. The P port of solenoid directional valve C is connected to the piston chamber of cylinder A, and the B port of solenoid directional valve C is connected to the piston rod chamber of cylinder A. When cutting the strip, solenoid directional valve C is energized, and the piston chamber and the piston rod chamber of cylinder B16 are communicated, so that the high-pressure oil in the piston chamber flows to the piston rod chamber to realize pressure relief. After the pressure relief is completed, solenoid directional valve C is de-energized, solving the problem that the pressure in the piston chamber of the existing floating shear device's hydraulic control circuit cannot be slowly relieved instantaneously when cutting the strip, resulting in violent vibration of the pipeline;
[0016] In the hydraulic control circuit of the floating shear of the present utility model, check valves are provided between the P ports of solenoid directional valve A and solenoid directional valve B and the oil source P1. After the unit stops, solenoid directional valve A, solenoid directional valve B, and solenoid directional valve C are de-energized, and a closed volume is formed between the outlet of the check valve and the upper chambers of the spools of cartridge check valve A, cartridge check valve B, cartridge check valve C, and cartridge check valve D, so as to ensure that the closed volume of the piston chamber of cylinder A remains unchanged, meet the requirement that the upper shear blade does not drop when the unit stops, ensure the goal of reducing the daily maintenance amount of the floating shear pipeline, and improve production efficiency;
[0017] Due to the design of the check valve and solenoid directional valve C, the hydraulic control circuit of the floating shear of the present utility model solves the practical problems of increased maintenance amount and inconvenient operation existing in the existing control circuit, improves the efficiency for the enterprise to use, maintain and operate, and further improves the social benefits of the enterprise. Description of the Drawings
[0018] Figure 1 is the hydraulic control circuit diagram of the existing floating shear device in the background technology;
[0019] Figure 2 is the hydraulic control circuit diagram of the floating shear device of the present utility model;
[0020] In the above figures: 1 - proportional flow valve; 2 - solenoid directional valve A; 3 - solenoid directional valve B; 4 - cylinder A; 5 - cartridge check valve A; 6 - cartridge check valve B; 7 - cartridge check valve C; 8 - cartridge check valve D; 9 - check valve; 10 - solenoid directional valve C. Detailed Embodiments
[0021] In order to better understand the present utility model, the content of the present utility model will be further clarified below in conjunction with embodiments, but the content of the present utility model is not limited to the following embodiments only.
[0022] Combined with the attached Figure 2, elaborating on a hydraulic control circuit for a floating shear of the present utility model, which includes a cartridge check valve A5, a cartridge check valve B6, a cartridge check valve C7, a cartridge check valve D8, and an oil cylinder A4 for driving the upper and lower blades of the floating shear. It also includes the first to fourth hydraulic control circuits.
[0023] The first hydraulic control circuit includes a solenoid directional valve A2 and a solenoid directional valve B3. The P ports of the solenoid directional valve A2 and the solenoid directional valve B3 are connected to the oil source P1. A check valve 9 is provided between the P ports of the solenoid directional valve A2 and the solenoid directional valve B3 and the oil source P1. The T ports of the solenoid directional valve A2 and the solenoid directional valve B3 are connected to the leakage oil L1. The A port of the solenoid directional valve A2 is respectively connected to the control ports of the cartridge check valve B6 and the cartridge check valve D8. The A port of the solenoid directional valve B3 is respectively connected to the control ports of the cartridge check valve A5 and the cartridge check valve C7. The first hydraulic control circuit is used to control the opening and closing of the cartridge check valve A5, the cartridge check valve B6, the cartridge check valve C7, and the cartridge check valve D8. After the unit stops, the solenoid directional valve A, the solenoid directional valve B, and the solenoid directional valve C lose power, and a closed volume is formed between the outlet of the check valve and the upper chambers of the spools of the cartridge check valve A, the cartridge check valve B, the cartridge check valve C, and the cartridge check valve D, thus ensuring that the closed volume of the piston chamber of the oil cylinder A remains unchanged, meeting the requirement that the upper shear blade does not drop when the unit stops, ensuring the goal of reducing the daily maintenance volume of the floating shear pipeline, and improving production efficiency.
[0024] The second hydraulic control circuit includes a proportional flow valve 1, a cartridge check valve C7, and a cartridge check valve A5. The inlet of the proportional flow valve 1 is connected to the oil source P1. The leakage port of the proportional flow valve 1 is connected to the leakage oil L1. The outlet of the proportional flow valve 1 is connected to the B port of the cartridge check valve C7. The A port of the cartridge check valve C7 is connected to the piston chamber of the oil cylinder A4. The piston rod chamber of the oil cylinder A4 is connected to the A port of the cartridge check valve A5. The B port of the cartridge check valve A5 is connected to the return oil T1. The second hydraulic control circuit is used to control the shearing and closing of the floating shear blade.
[0025] The third hydraulic control circuit includes a solenoid directional valve C10. The P port of the solenoid directional valve C10 is connected to the piston chamber of the oil cylinder A4. The B port of the solenoid directional valve C10 is connected to the piston rod chamber of the oil cylinder A4. The third hydraulic control circuit is used to control the pressure relief of the piston chamber of the oil cylinder A4. When cutting the strip, the solenoid directional valve C is energized, and the piston chamber and the piston rod chamber of the oil cylinder B16 are connected, so that the high-pressure oil in the piston chamber flows to the piston rod chamber to achieve pressure relief. After the pressure relief is completed, the solenoid directional valve C loses power, solving the problem that the hydraulic control circuit of the existing floating shear device cannot slowly relieve the pressure in the piston chamber instantaneously when cutting the strip, resulting in severe vibration of the pipeline.
[0026] The fourth hydraulic control circuit includes a proportional flow valve 1, a cartridge check valve D8, and a cartridge check valve B6. The B port of the cartridge check valve B6 is connected to the outlet of the proportional flow valve 1, the A port of the cartridge check valve B6 is connected to the piston rod chamber of the oil cylinder A4, the piston chamber of the oil cylinder A4 is connected to the A port of the cartridge check valve D8, and the B port of the cartridge check valve D8 is connected to the return oil T1. The fourth hydraulic control circuit is used to control the opening of the floating shear blade.
[0027] The working process of the present utility model is as follows:
[0028] The first hydraulic control circuit controls the opening and closing of the cartridge check valve A5, the cartridge check valve B6, the cartridge check valve C7, and the cartridge check valve D8. This control circuit is realized as follows:
[0029] When the electromagnetic directional valve B3 is energized, the cartridge check valve A5 and the cartridge check valve C7 open; when the electromagnetic directional valve B3 is de-energized, the cartridge check valve A5 and the cartridge check valve C7 close; when the electromagnetic directional valve A2 is energized, the cartridge check valve B6 and the cartridge check valve D8 open; when the electromagnetic directional valve A2 is de-energized, the cartridge check valve B6 and the cartridge check valve D8 close.
[0030] The second hydraulic control circuit controls the closing of the floating shear blade. This control circuit is realized as follows: The inlet of the proportional flow valve 1 is connected to the oil source P1, the leakage port of the proportional flow valve 1 is connected to the leakage oil L1, the outlet of the proportional flow valve 1 is connected to the B port of the cartridge check valve C7, the A port of the cartridge check valve C7 is connected to the piston chamber of the oil cylinder A4, the piston rod chamber of the oil cylinder A4 is connected to the A port of the cartridge check valve A5, and the B port of the cartridge check valve A5 is connected to the common return oil port T1. When the floating shear cutting command is issued, the oil from the oil source P1 sequentially enters the proportional flow valve 1, the cartridge check valve C7, and the piston chamber of the oil cylinder A4; the oil in the piston rod chamber enters the cartridge check valve A5 and the common return oil port T1, so that the floating shear blade closes to cut the strip.
[0031] The third hydraulic control circuit controls the pressure relief of the piston chamber (high-pressure chamber) of the oil cylinder A4. This control circuit is realized as follows: The piston chamber of the oil cylinder A4 is connected to the P port of the electromagnetic directional valve C10, and the piston rod chamber of the oil cylinder A4 is connected to the B port of the electromagnetic directional valve C10. When the floating shear issues a pressure relief command, the electromagnetic directional valve C10 is energized and PB is connected, and the oil in the piston chamber (high-pressure chamber) enters the piston rod chamber, and the high pressure is released. When the electromagnetic directional valve C10 is de-energized, the oil in the piston chamber and the piston rod chamber of the oil cylinder A4 is disconnected.
[0032] The fourth hydraulic control circuit controls the opening of the floating shear blade, and this control circuit is implemented as follows: The inlet of the proportional flow valve 1 is connected to the oil source P1, the outlet is connected to the port B of the cartridge check valve B6, the port A of the cartridge check valve B6 is connected to the piston rod chamber of the oil cylinder A4, the piston chamber of the oil cylinder A4 is connected to the port A of the cartridge check valve D8, and the port B of the cartridge check valve D8 is connected to the common oil return port T1; When the command to open the floating shear is issued, the oil from the oil source P1 enters the proportional flow valve 1, the cartridge check valve B6, and the piston rod chamber of the oil cylinder A4 in sequence; The oil in the piston chamber enters the cartridge check valve D8 and the common oil return port T1, so that the floating shear blade opens and returns to the original state.
[0033] Other connections and controls are of the conventional type and will not be described in detail here.
[0034] The above description is only the application implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto, and the scope of rights of the present utility model cannot be limited thereby. Any equivalent changes made according to the technical solution of the present utility model should be covered within the protection scope of the present utility model.
Claims
1. A floating shear hydraulic control circuit, comprising a cartridge check valve A, a cartridge check valve B, a cartridge check valve C and a cartridge check valve D and a cylinder A for driving the upper and lower blades of the floating shear, characterized in that: It also includes the first to fourth hydraulic control circuits, The first hydraulic control circuit includes a solenoid reversing valve A and a solenoid reversing valve B, and the first hydraulic control circuit is used to control the opening and closing of the cartridge check valve A, the cartridge check valve B, the cartridge check valve C and the cartridge check valve D; The second hydraulic control circuit includes a proportional flow valve, a cartridge check valve C and a cartridge check valve A, and the second hydraulic control circuit is used to control the shearing and closing of the floating scissor blade; The third hydraulic control circuit includes an electromagnetic reversing valve C, the P port of the electromagnetic reversing valve C is connected to the piston chamber of the oil cylinder A, the B port of the electromagnetic reversing valve C is connected to the piston rod chamber of the oil cylinder A, and the third hydraulic control circuit is used to control the pressure relief of the piston chamber of the oil cylinder A; The fourth hydraulic control circuit includes a cartridge check valve D and a cartridge check valve B, and the fourth hydraulic control circuit is used to control the opening of the floating scissor blades.
2. The floating shear hydraulic control circuit according to claim 1 is characterized in that: The inlet of the proportional flow valve is connected to the oil source P1, the leakage port of the proportional flow valve is connected to the leakage oil L1, the outlet of the proportional flow valve is connected to the B port of the cartridge check valve C, the A port of the cartridge check valve C is connected to the piston chamber of the oil cylinder A, the piston rod chamber of the oil cylinder A is connected to the A port of the cartridge check valve A, and the B port of the cartridge check valve A is connected to the return oil T1.
3. The floating shear hydraulic control circuit according to claim 2 is characterized in that: The B port of the cartridge check valve B is connected to the outlet of the proportional flow valve, the A port of the cartridge check valve B is connected to the piston rod chamber of the oil cylinder A, the piston chamber of the oil cylinder A is connected to the A port of the cartridge check valve D, and the B port of the cartridge check valve D is connected to the return oil T1.
4. The floating shear hydraulic control circuit according to claim 2 is characterized in that: The P ports of the solenoid reversing valve A and the solenoid reversing valve B are connected to the oil source P1, a check valve is arranged between the P ports of the solenoid reversing valve A and the solenoid reversing valve B and the oil source P1, the T ports of the solenoid reversing valve A and the solenoid reversing valve B are connected to the leakage oil L1, the A port of the solenoid reversing valve A is connected to the control ports of the cartridge check valve B and the cartridge check valve D respectively, and the A port of the solenoid reversing valve B is connected to the control ports of the cartridge check valve A and the cartridge check valve C respectively.