Hydraulic control loop for transverse movement of coiling machine

Abstract

The utility model discloses a hydraulic control loop for transverse movement of a coiling machine, which relates to the technical field of steel rolling production, and comprises an oil tank, a hydraulic cylinder, a first reversing valve, a pressure reducing valve and a second reversing valve, the oil tank is connected with an oil supply path, an oil return path and an oil discharge path, and a piston rod of the hydraulic cylinder is used for being connected with the coiling machine to be transversely moved. Two working oil ports of the first reversing valve are communicated with a rod cavity and a rodless cavity of the hydraulic cylinder respectively, an oil inlet of the first reversing valve is communicated with the oil supply way, an oil outlet of the first reversing valve is communicated with the oil return way, and the pressure reducing valve is installed in a pipeline where the oil inlet of the first reversing valve is communicated with the oil supply way. The second reversing valve is connected with the oil discharge port of the pressure reducing valve and connected with the oil discharge loop so as to control whether the oil discharge port of the pressure reducing valve is communicated with the oil discharge loop or not. In the transverse moving process of the recoiling machine, different pressure control is adopted for moving-out and returning of the recoiling machine, and the defect that the recoiling machine moves unstably in the transverse moving process when the recoiling machine is pushed back to the working position is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of rolling steel production, in particular to a coiler transverse movement hydraulic control circuit. Background Technique

[0002] A coiler is an auxiliary equipment in a rolling mill workshop that winds steel into a reel shape. It is an important equipment in the coiling area and generally has an offline function. The coiler in the offline state can be pulled out from the drive side to repair or replace the coiler or its components. After the repair is completed, the coiler is pushed back to the working position.

[0003] The coiler in the offline state is horizontally moved by a hydraulic cylinder. The piston rod of the hydraulic cylinder is connected to the coiler. When the rodless cavity of the hydraulic cylinder is filled with oil, the coiler is pulled out from the drive side; when the rod chamber of the hydraulic cylinder is filled with oil, the coiler is pushed back to the working position. The hydraulic cylinder is installed in the hydraulic control circuit. The traditional hydraulic control circuit only sets a proportional directional valve to control the hydraulic cylinder. Since the effective action area of the rodless cavity is larger than that of the rod chamber, the extension speed of the hydraulic cylinder connected to the coiler is greater than the retraction speed, and the coiler moves unstably during the horizontal movement of being pushed back to the working position, which urgently needs to be improved. Content of the Utility Model

[0004] To solve the above problems, the present application provides a coiler transverse movement hydraulic control circuit.

[0005] The present application provides a coiler transverse movement hydraulic control circuit, which includes an oil tank, a hydraulic cylinder, a first directional valve, a pressure reducing valve, and a second directional valve. The oil tank is connected with an oil supply circuit, an oil return circuit, and an oil discharge circuit. The hydraulic cylinder is spaced from the oil tank. The piston rod of the hydraulic cylinder is used to connect to the coiler to be horizontally moved. Two working oil ports of the first directional valve are respectively communicated with the rod chamber and the rodless cavity of the hydraulic cylinder. The oil inlet of the first directional valve is communicated with the oil supply circuit, and the oil outlet of the first directional valve is communicated with the oil return circuit. The pressure reducing valve is installed in the pipeline where the oil inlet of the first directional valve is communicated with the oil supply circuit. The second directional valve is connected to the oil discharge port of the pressure reducing valve and is connected to the oil discharge circuit to control whether the oil discharge port of the pressure reducing valve is communicated with the oil discharge circuit.

[0006] In some embodiments, the coiler transverse movement hydraulic control circuit includes:

[0007] At least one first hydraulic lock is installed in the pipeline where the working oil port of the first directional valve is communicated with the hydraulic cylinder.

[0008] In some embodiments, the coiler transverse movement hydraulic control circuit includes:

[0009] Two first hydraulic locks are respectively installed in the pipeline connecting one working oil port of the first reversing valve to the rod chamber of the hydraulic cylinder and in the pipeline connecting the other working oil port of the first reversing valve to the rodless chamber of the hydraulic cylinder.

[0010] In some embodiments, the coiler traversing hydraulic control circuit includes:

[0011] A third reversing valve, provided with an oil supply port, an oil return port and a working port. The oil supply port is connected to a first position in the pipeline connecting the pressure reducing valve to the oil inlet of the first reversing valve. The oil return port is connected to the oil discharge pipeline, and the working port is connected to the control port and the oil discharge port of the first hydraulic lock. When the third reversing valve is in the first valve position, the oil supply port is connected to the working port, and when it is in the second valve position, the oil return port is connected to the working port.

[0012] In some embodiments, the coiler traversing hydraulic control circuit includes:

[0013] A second hydraulic lock is installed in the pipeline connecting the pressure reducing valve to the oil inlet of the first reversing valve and is located between the first position and the first reversing valve.

[0014] In some embodiments, both the control port and the oil discharge port of the second hydraulic lock are connected to the working port of the third reversing valve.

[0015] In some embodiments, the coiler traversing hydraulic control circuit includes:

[0016] An overflow valve. The oil inlet of the overflow valve is connected to the pipeline connecting the working oil port of the first reversing valve to the rodless chamber, and the oil outlet of the overflow valve is connected to the oil return pipeline.

[0017] In some embodiments, the first reversing valve is a proportional reversing valve. The control port of the first reversing valve is connected to the pipeline connecting the pressure reducing valve to the oil inlet of the first reversing valve, and the oil discharge port of the first reversing valve is connected to the oil discharge pipeline.

[0018] In some embodiments, the second reversing valve is an electromagnetic reversing valve.

[0019] In some embodiments, the third reversing valve is an electromagnetic reversing valve.

[0020] The beneficial effects of the present application are as follows: A coiler transverse hydraulic control circuit is provided, including an oil tank, a hydraulic cylinder, a first reversing valve, a pressure reducing valve, and a second reversing valve. There are an oil supply circuit, an oil return circuit, and an oil discharge circuit connected to the oil tank. Two working oil ports of the first reversing valve are respectively connected to the rodless cavity and the rod cavity of the hydraulic cylinder. The pressure reducing valve is installed in the pipeline where the oil inlet of the first reversing valve is connected to the oil supply circuit; when the first reversing valve is in the first valve position, the oil supply circuit is connected to the rodless cavity of the hydraulic cylinder, the oil return circuit is connected to the rod cavity of the hydraulic cylinder, the rodless cavity of the hydraulic cylinder is in the oil inlet state, and the piston rod of the hydraulic cylinder extends, so that the coiler is pushed back to the working position. By adjusting the second reversing valve, the oil discharge port of the pressure reducing valve is connected to the oil discharge circuit, and the pressure reducing valve plays a pressure reducing role, and the oil inlet at the oil inlet of the first reversing valve remains in a low-pressure state, thereby reducing the extension speed of the piston rod of the hydraulic cylinder and improving the movement stability during the transverse movement of the coiler being pushed back to the working position; when the first reversing valve is in the second valve position, the oil supply circuit is connected to the rod cavity of the hydraulic cylinder, the oil return circuit is connected to the rodless cavity of the hydraulic cylinder, the rod cavity of the hydraulic cylinder is in the oil inlet state, and the piston rod of the hydraulic cylinder retracts, so that the coiler is withdrawn from the drive side. By adjusting the second reversing valve, the oil discharge port of the pressure reducing valve is not connected to the oil discharge circuit, and the pressure reducing valve does not play a pressure reducing role, and the oil inlet at the oil inlet of the first reversing valve remains in a high-pressure state; the present application realizes the high and low pressure switching function of the hydraulic circuit through the pressure reducing valve and the second reversing valve, and adopts different pressure controls for the removal and return of the coiler during the transverse movement of the coiler, improving the defect of unstable movement during the transverse movement of the coiler being pushed back to the working position. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0022] Figure 1 It is a schematic diagram of a coiler transverse hydraulic control circuit provided by the present application.

[0023] Reference numerals in the drawings: 11 - oil supply circuit, 12 - oil return circuit, 13 - oil discharge circuit, 2 - hydraulic cylinder, 3 - first reversing valve, 31 - working oil port, 32 - oil inlet, 33 - oil outlet, 34 - first control port, 35 - first oil discharge port, 4 - pressure reducing valve, 41 - second oil discharge port, 5 - second reversing valve, 6 - first hydraulic lock, 61 - third control port, 62 - third oil discharge port, 7 - third reversing valve, 71 - oil supply port, 72 - oil return port, 73 - working port, 8 - second hydraulic lock, 81 - fourth control port, 82 - fourth oil discharge port, 9 - overflow valve. Detailed Embodiments

[0024] Please refer to Figure 1, this application discloses a hydraulic control circuit for the transverse movement of a coiler, which includes an oil tank, a hydraulic cylinder 2, a first reversing valve 3, a pressure reducing valve 4 and a second reversing valve 5. The oil tank is connected with an oil supply pipeline 11, an oil return pipeline 12 and an oil discharge pipeline 13, and the hydraulic cylinder 2 is spaced from the oil tank. Among them, the coiler is an auxiliary equipment in the rolling mill workshop for coiling steel into a reel shape. The piston rod of the hydraulic cylinder 2 is used to connect with the coiler to be transversely moved. When the rodless cavity of the hydraulic cylinder 2 is filled with oil, the coiler is withdrawn from the drive side; when the rod cavity of the hydraulic cylinder 2 is filled with oil, the coiler is pushed back to the working position.

[0025] Please refer to Figure 1 , the first reversing valve 3 is provided with an oil inlet 32, an oil outlet 33 and two working oil ports 31. The oil inlet 32 is communicated with the oil supply pipeline 11, the oil outlet 33 is communicated with the oil return pipeline 12, and the two working oil ports 31 are respectively communicated with the rod cavity and the rodless cavity of the hydraulic cylinder 2. By controlling the first reversing valve 3 to be in different valve positions, the piston rod of the hydraulic cylinder 2 can be extended or retracted.

[0026] Please refer to Figure 1 , the first reversing valve 3 can adopt a three-position four-way reversing valve.

[0027] Please refer to Figure 1 , the pressure reducing valve 4 is installed in the pipeline where the oil inlet 32 of the first reversing valve 3 is communicated with the oil supply pipeline 11. The oil discharge port of the pressure reducing valve 4 is shown as Figure 1 the second oil discharge port 41 in Figure 1 . The second reversing valve 5 is connected with the second oil discharge port 41, and the second reversing valve 5 is connected with the oil discharge circuit. By controlling the second reversing valve 5 to be in different valve positions, the oil discharge port of the pressure reducing valve 4 can be conducted or not conducted with the oil discharge circuit. Please refer to Figure 1 When the second reversing valve 5 is in the upper valve position of the second reversing valve 5 in Figure 1 , the oil discharge port of the pressure reducing valve 4 is not conducted with the oil discharge circuit; when the second reversing valve 5 is in the lower valve position of the second reversing valve 5 in

[0028] Please refer to Figure 1 , the second reversing valve 5 can adopt a two-position four-way reversing valve.

[0029] Specifically, when the first reversing valve 3 is in the first valve position, the first valve position of the first reversing valve 3 corresponds to Figure 1The first reversing valve 3 is in the lower valve position, the oil supply circuit 11 is connected with the rodless chamber of the hydraulic cylinder 2, and the oil return circuit 12 is connected with the rod chamber of the hydraulic cylinder 2. The rodless chamber of the hydraulic cylinder 2 is in the oil filling state, and the piston rod of the hydraulic cylinder 2 is extended, so that the coiler is pushed back to the working position. By adjusting the second reversing valve 5, the oil unloading port of the pressure reducing valve 4 is connected with the oil unloading circuit, and the pressure reducing valve 4 plays a pressure reducing role. The oil inlet 32 ​​of the first reversing valve 3 is kept in a low-pressure state, thereby reducing the extension speed of the piston rod of the hydraulic cylinder 2 and improving the movement stability of the coiler during the lateral movement when it is pushed back to the working position.

[0030] When the first reversing valve 3 is in the second valve position, the second valve position of the first reversing valve 3 corresponds to Figure 1 The first reversing valve 3 is in the upper valve position, the oil supply circuit 11 is connected with the rod chamber of the hydraulic cylinder 2, and the oil return circuit 12 is connected with the rodless chamber of the hydraulic cylinder 2. The rod chamber of the hydraulic cylinder 2 is in the oil filling state, and the piston rod of the hydraulic cylinder 2 is retracted, so that the coiler is withdrawn from the transmission side. By adjusting the second reversing valve 5, the oil unloading port of the pressure reducing valve 4 is not connected to the oil unloading circuit, and the pressure reducing valve 4 does not have a pressure reducing effect. The oil inlet 32 ​​of the first reversing valve 3 remains in a high-pressure state.

[0031] To summarize, the present application realizes the high-low pressure switching function of the hydraulic circuit through the pressure reducing valve 4 and the second reversing valve 5, and adopts different pressure controls for the movement and return of the coiler during the lateral movement of the coiler, thereby improving the defect of unstable movement of the coiler during the lateral movement of the coiler when it is pushed back to the working position.

[0032] In some embodiments, see Figure 1 The coiler traverse hydraulic control circuit includes at least one first hydraulic lock 6. In the present application, the first hydraulic lock 6 refers to a single hydraulic lock, which has a hydraulically controlled one-way valve. The first hydraulic lock 6 is installed in the pipeline connecting the working oil port 31 of the first reversing valve 3 and the hydraulic cylinder 2. When the first hydraulic lock 6 is in the locked state, the extension amount of the piston rod of the hydraulic cylinder 2 is kept unchanged, and the position of the coiler is maintained unchanged.

[0033] In some embodiments, see Figure 1 The coiler traverse hydraulic control circuit includes two first hydraulic locks 6, which are respectively installed in a pipeline connecting one working oil port of the first reversing valve 3 and the rod chamber of the hydraulic cylinder 2, and in a pipeline connecting another working oil port of the first reversing valve 3 and the rodless chamber of the hydraulic cylinder 2. It should be noted that the two first hydraulic locks 6 form a double hydraulic lock.

[0034] In some embodiments, see Figure 1, the coiler transverse movement hydraulic control circuit includes a third reversing valve 7. The third reversing valve 7 is provided with an oil supply port 71, an oil return port 72, and a working port 73. The oil supply port 71 of the third reversing valve 7 is communicated with the pipeline where the pressure reducing valve 4 is communicated with the oil inlet 32 of the first reversing valve 3, and the oil supply port 71 of the third reversing valve 7 is communicated with the first position of this pipeline. The oil return port 72 of the third reversing valve 7 is communicated with the oil discharging pipeline 13. The control port of the first hydraulic lock 6 is shown as Figure 1 the third control port 61 in Figure 1 The working port 73 of the third reversing valve 7 is communicated with the third control port 61. The oil discharging port of the first hydraulic lock 6 is shown as Figure 1 the third oil discharging port 62 in Figure 1 The working port 73 of the third reversing valve 7 is communicated with the third oil discharging port 62. When the third reversing valve 7 is in the first valve position, the oil supply port 71 is communicated with the working port 73. The first valve position here is shown as

[0035] Please refer to Figure 1 that the third reversing valve 7 can adopt a two-position four-way reversing valve.

[0036] In some embodiments, please refer to Figure 1 that the coiler transverse movement hydraulic control circuit includes a second hydraulic lock 8. In this application, the second hydraulic lock 8 refers to a single hydraulic lock, and the single hydraulic lock has a pilot-operated check valve. The second hydraulic lock 8 is installed in the pipeline where the pressure reducing valve 4 is communicated with the oil inlet 32 of the first reversing valve 3, and the second hydraulic lock 8 is located between the first position and the first reversing valve 3. The second hydraulic lock 8 plays a role similar to a switch. When there is an input at the control port of the second hydraulic lock 8, the second hydraulic lock 8 is in an open state.

[0037] In some embodiments, please refer to Figure 1 that the control port and the oil discharging port of the second hydraulic lock 8 are both communicated with the working port 73 of the third reversing valve 7. The control port of the second hydraulic lock 8 is shown as Figure 1 the fourth control port 81 in Figure 1The fourth oil discharge port 82 therein, the functions of the fourth control port 81 and the fourth oil discharge port 82 are similar to those of the third control port 61 and the third oil discharge port 62, and will not be elaborated here.

[0038] As described above, the present application can control the first hydraulic lock 6 and the second hydraulic lock 8 through a single reversing valve.

[0039] In some embodiments, the coiler transverse movement hydraulic control circuit includes an overflow valve 9. The oil inlet 32 of the overflow valve 9 is connected to the pipeline where the working oil port 31 of the first reversing valve 3 is connected to the rodless cavity. The oil outlet 33 of the overflow valve 9 is connected to the return oil circuit 12, and the overflow valve 9 is provided to play a role in safety protection.

[0040] In some embodiments, please refer to Figure 1 , the first reversing valve 3 is a proportional reversing valve, and the control port of the first reversing valve 3 is shown as Figure 1 the first control port 34 in Figure 1 . The first control port 34 is connected to the pipeline where the pressure reducing valve 4 is connected to the oil inlet 32 of the first reversing valve 3. The oil discharge port of the first reversing valve 3 is shown as

[0041] the first oil discharge port 35 in

[0042] . The hydraulic oil of the oil supply pipeline 11 is used as the input of the control port of the first reversing valve 3 to improve the automation degree of the coiler transverse movement hydraulic control circuit.

[0043] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A coiler transverse hydraulic control circuit, characterized in that, Comprising: An oil tank, connected with an oil supply pipeline, an oil return pipeline and an oil discharge pipeline; A hydraulic cylinder, spaced from the oil tank, and the piston rod of the hydraulic cylinder is used to connect with a coiler to be laterally moved; A first directional control valve, two working oil ports of the first directional control valve are respectively communicated with the rod chamber and the rodless chamber of the hydraulic cylinder, the oil inlet of the first directional control valve is communicated with the oil supply pipeline, and the oil outlet of the first directional control valve is communicated with the oil return pipeline; A pressure reducing valve, installed in the pipeline where the oil inlet of the first directional control valve is communicated with the oil supply pipeline; A second directional control valve, connected with the oil discharge port of the pressure reducing valve and connected with the oil discharge pipeline to control whether the oil discharge port of the pressure reducing valve is communicated with the oil discharge pipeline.

2. The coiler traverse hydraulic control circuit according to claim 1, characterized in that, The lateral movement hydraulic control circuit of the coiler comprises: At least one first hydraulic lock, installed in the pipeline where the working oil port of the first directional control valve is communicated with the hydraulic cylinder.

3. The coiler traversing hydraulic control circuit according to claim 2, characterized in that, The lateral movement hydraulic control circuit of the coiler comprises: Two of the first hydraulic locks are respectively installed in the pipeline where one working oil port of the first directional control valve is communicated with the rod chamber of the hydraulic cylinder and in the pipeline where the other working oil port of the first directional control valve is communicated with the rodless chamber of the hydraulic cylinder.

4. The coiler traversing hydraulic control circuit according to claim 2, characterized in that, The lateral movement hydraulic control circuit of the coiler comprises: A third directional control valve, provided with an oil supply port, an oil return port and a working port, the oil supply port is communicated to a first position in the pipeline where the pressure reducing valve is communicated with the oil inlet of the first directional control valve, the oil return port is communicated with the oil discharge pipeline, the working port is communicated with the control port and the oil discharge port of the first hydraulic lock, and when the third directional control valve is in the first valve position, the oil supply port is communicated with the working port, and when in the second valve position, the oil return port and the working port are communicated.

5. The coiler traversing hydraulic control circuit according to claim 4, characterized in that, The lateral movement hydraulic control circuit of the coiler comprises: A second hydraulic lock, installed in the pipeline where the pressure reducing valve is communicated with the oil inlet of the first directional control valve and located between the first position and the first directional control valve.

6. The lateral movement hydraulic control circuit of the coiler according to claim 5, wherein The control port and the oil discharge port of the second hydraulic lock are both communicated with the working port of the third directional control valve.

7. The coiler transverse hydraulic control circuit according to any one of claims 1-6, characterized in that, The lateral movement hydraulic control circuit of the coiler comprises: A relief valve, the oil inlet of the relief valve is communicated with the pipeline where the working oil port of the first directional control valve is communicated with the rodless chamber, and the oil outlet of the relief valve is communicated with the oil return pipeline.

8. The lateral movement hydraulic control circuit of the coiler according to any one of claims 1-6, wherein The first directional control valve is a proportional directional control valve, the control port of the first directional control valve is communicated with the pipeline where the pressure reducing valve is communicated with the oil inlet of the first directional control valve, and the oil discharge port of the first directional control valve is communicated with the oil discharge pipeline.

9. The lateral movement hydraulic control circuit of the coiler according to any one of claims 1-6, wherein The second directional control valve is an electromagnetic directional control valve.

10. The lateral movement hydraulic control circuit of the coiler according to any one of claims 4-6, wherein The third directional control valve is an electromagnetic directional control valve.

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