A balancing circuit for the upper support roll of a six-roller strip mill

Abstract

The present invention belongs to the field of plate and strip rolling technology, and specifically relates to a six-roll plate and strip rolling mill upper support roller balancing circuit. The present invention is organically combined by five ball valves, a pressure reducing valve, a pressure measuring assembly, two electromagnetic reversing valves, a zero-leakage electromagnetic lock valve, a relief valve, two two-way flow control valves, two first rectifier superimposed plates, a superimposed relief valve, two pressure relays, two operating side upper support roller balancing cylinders and two transmission side upper support roller balancing cylinders. The movement speeds of the operating side upper support roller balancing cylinder and the transmission side upper support roller balancing cylinder of the present invention are conveniently adjusted synchronously, and the upper support roller balancing cylinder can achieve three different balancing pressures, reducing the possibility of the upper support roller weight being completely pressed on the upper intermediate roller to produce roller marks. When the machine is shut down, the upper support roller position can maintain the upper support roller balanced position for a long time, effectively ensuring the finished product quality of the rolled strip.

Description

Technical Field

[0001] The invention belongs to the technical field of plate and strip rolling, and in particular relates to a balancing circuit for support rollers on a six-roller plate and strip rolling mill. Background Art

[0002] During the production process of the six-roll strip mill, the weight of the upper support roll is an interference factor for the control of the mill, so the weight of the upper support roll needs to be balanced during the rolling process to reduce its influence on the rolling. During the roll changing process, the upper support roll needs to be balanced or dropped according to the roll changing requirements, and its action is controlled by the upper support roll balancing circuit. The traditional upper support roll balancing circuit has the following shortcomings:

[0003] 1) The upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side are controlled at the same time, and the working oil is directly divided into the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side by a tee. The upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side have no separate adjustment function. Due to the influence of factors such as machining accuracy, the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side are not synchronized, and accidents such as upper support roller tilting may occur during roller changing.

[0004] 2) The balancing pressure of the upper support roller balancing circuit is fixed, and the upper support roller balancing cylinder drops down through the electromagnetic reversing valve to control the pressure oil passing through the rod chamber of the upper support roller balancing cylinder. After falling, the weight of the upper support roller falls completely on the upper middle roller, which is easy to form roller marks, thereby affecting the quality of the finished rolled strip.

[0005] 3) When the machine is shut down, the position of the upper support roller is maintained by a common superimposed hydraulically controlled one-way valve, which cannot maintain the balanced position of the upper support roller for a long time. After the upper support roller stays for a period of time, it will naturally fall down and contact with the upper intermediate roller to form a roller mark, thereby affecting the quality of the finished rolled strip. Summary of the invention

[0006] The present invention provides an upper support roller balancing circuit for a six-roll plate and strip rolling mill. One of the purposes is to provide an upper support roller balancing circuit for a six-roll plate and strip rolling mill that can ensure the synchronization of the actions of the operating side and the transmission side during the upper support roller replacement process, and can simultaneously realize different balancing forces of the upper support roller balancing circuit; the second purpose is to provide an upper support roller balancing circuit for a six-roll plate and strip rolling mill that can maintain the upper support roller balanced position for a long time when the machine is shut down, thereby effectively ensuring the quality of the finished rolled strip product.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A support roller balancing circuit on a six-roll plate and strip rolling mill comprises a first electromagnetic reversing valve, a zero-leakage electromagnetic locking valve, a first two-way flow control valve, a second two-way flow control valve, a first rectifying superposition plate, a second rectifying superposition plate, an operating side upper support roller balancing cylinder, a transmission side upper support roller balancing cylinder, a total oil supply port and a total oil return port; the total oil supply port is connected to the inlet of the zero-leakage electromagnetic locking valve through the first electromagnetic reversing valve, and the outlet of the zero-leakage electromagnetic locking valve is connected to the first rectifying superposition plate and the second rectifying superposition plate respectively; the first rectifying superposition plate is connected to the plug cavity of the support roller balancing cylinder on the operating side through the first two-way flow control valve, the second rectifying superposition plate is connected to the plug cavity of the support roller balancing cylinder on the transmission side through the second two-way flow control valve, the rod cavity of the support roller balancing cylinder on the operating side and the rod cavity of the support roller balancing cylinder on the transmission side are connected to the first electromagnetic reversing valve, and the total oil return port is connected to the first electromagnetic reversing valve.

[0009] It also includes a pressure reducing valve; the inlet of the pressure reducing valve is connected to the main oil supply port, the outlet of the pressure reducing valve is connected to the first electromagnetic reversing valve, and the oil drain port of the pressure reducing valve is connected to the main oil return port.

[0010] It also includes a pressure measuring assembly; the pressure measuring assembly is connected to the pressure reducing valve and is used to measure the working pressure of the upper support roller balancing circuit.

[0011] It also includes a first ball valve, a second ball valve, a third ball valve, a fourth ball valve and a fifth ball valve; the first ball valve is connected to the pipeline connecting the main oil supply port and the first electromagnetic reversing valve; the second ball valve is connected to the main oil return port; the third ball valve is connected to the pipeline between the first rectifying superposition plate and the support roller balancing cylinder on the operating side, the fourth ball valve is connected to the pipeline connecting the second rectifying superposition plate and the support roller balancing cylinder on the transmission side, and the fifth ball valve is connected to the pipeline connecting the rod cavity of the support roller balancing cylinder on the operating side and the rod cavity of the support roller balancing cylinder on the transmission side and the first electromagnetic reversing valve.

[0012] It also includes a relief valve, a superimposed relief valve and a second electromagnetic reversing valve; the inlet of the relief valve is connected to the outlet of the zero-leakage electromagnetic lock valve, the outlet of the relief valve is connected to the total oil return port, and the oil drain port of the relief valve is connected to the second electromagnetic reversing valve; the working oil ports A and B of the second electromagnetic reversing valve are connected to the total oil return port through the superimposed relief valve.

[0013] It also includes a first pressure relay and a second pressure relay; the first pressure relay is arranged between the zero-leakage electromagnetic lock valve and the first rectifier superposition plate and the second rectifier superposition plate; the second pressure relay is arranged between the support roller balancing cylinder rod cavity on the operating side, the support roller balancing cylinder rod cavity on the transmission side and the first electromagnetic reversing valve.

[0014] The operating side upper support balancing cylinder comprises a first operating side upper support roller balancing cylinder and a second operating side upper support roller balancing cylinder; the first operating side upper support roller balancing cylinder and the second operating side upper support roller balancing cylinder are connected in parallel.

[0015] The transmission side upper support roller balancing cylinder comprises a first transmission side upper support roller balancing cylinder and a second transmission side upper support roller balancing cylinder; the first transmission side upper support roller balancing cylinder and the second transmission side upper support roller balancing cylinder are connected in parallel.

[0016] It also includes a pressure reducing valve, a first ball valve, a second ball valve, a third ball valve, a fourth ball valve, a fifth ball valve, a relief valve, a superimposed relief valve, a second electromagnetic reversing valve, a pressure measuring assembly, a first pressure relay and a second pressure relay; the inlet of the pressure reducing valve is connected to the main oil supply port, the outlet of the pressure reducing valve is connected to the first electromagnetic reversing valve, and the oil drain port of the pressure reducing valve is connected to the main oil return port; the first ball valve is connected to the pipeline connecting the main oil supply port and the first electromagnetic reversing valve; the second ball valve is connected to the main oil return port; the third ball valve is connected to the pipeline between the first rectifying superimposed plate and the support roller balancing cylinder on the operating side, the fourth ball valve is connected to the pipeline connecting the second rectifying superimposed plate and the support roller balancing cylinder on the transmission side, and the fifth ball valve is connected to the rod chamber of the support roller balancing cylinder on the operating side and the rod chamber of the support roller balancing cylinder on the transmission side and the first electromagnetic reversing valve; the inlet of the relief valve is connected to the outlet of the zero leakage electromagnetic lock valve, and the outlet of the relief valve is connected to the main oil return port, The oil drain port of the overflow valve is connected to the second electromagnetic reversing valve; the working oil ports A and B of the second electromagnetic reversing valve are connected to the total oil return port through a superimposed overflow valve; the pressure measuring assembly is connected to the pressure reducing valve to measure the working pressure of the upper support roller balancing circuit; the first pressure relay is arranged between the zero leakage electromagnetic lock valve and the first rectifier superposition plate and the second rectifier superposition plate; the second pressure relay is arranged between the rod cavity of the upper support roller balancing cylinder on the operating side, the rod cavity of the upper support roller balancing cylinder on the transmission side and the first electromagnetic reversing valve; the upper support roller balancing cylinder on the operating side includes the first upper support roller balancing cylinder on the operating side and the second upper support roller balancing cylinder on the operating side; the first upper support roller balancing cylinder on the operating side and the second upper support roller balancing cylinder on the operating side are connected in parallel; the upper support roller balancing cylinder on the transmission side includes the first upper support roller balancing cylinder on the transmission side and the second upper support roller balancing cylinder on the transmission side; the first upper support roller balancing cylinder on the transmission side and the second upper support roller balancing cylinder on the transmission side are connected in parallel.

[0017] Beneficial effects:

[0018] The present invention is organically composed of five ball valves, a pressure reducing valve, a pressure measuring assembly, two electromagnetic reversing valves, a zero-leakage electromagnetic lock valve, a relief valve, two two-way flow control valves, two first rectifier superimposed plates, a superimposed relief valve, two pressure relays, two operating side upper support roller balancing cylinders and two transmission side upper support roller balancing cylinders. The movement speeds of the operating side upper support roller balancing cylinder and the transmission side upper support roller balancing cylinder of the present invention are conveniently synchronized to avoid accidents such as the upper support roller tilting during the roller changing process. The upper support roller balancing cylinder can achieve three different balancing pressures, reducing the possibility of the upper support roller weight being completely pressed on the upper intermediate roller to produce roller marks. When the machine is shut down, the upper support roller position can maintain the upper support roller balanced position for a long time, effectively ensuring the finished product quality of the rolled strip.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the present invention.

[0022] In the figure: 1-1, the first ball valve; 1-2, the second ball valve; 2-pressure reducing valve; 3-pressure measuring assembly; 4-1, the first electromagnetic reversing valve; 4-2, the second electromagnetic reversing valve; 5, the zero leakage electromagnetic lock valve; 6, the overflow valve; 7-1, the first two-way flow control valve; 7-2, the second two-way flow control valve; 8-1, the first rectifier stacking plate; 8-2, the second rectifier stacking plate; 9, the stacked overflow valve; 10-1, the third ball valve; 10-2, the fourth ball valve; 10-3, the fifth ball valve; 11-1, the first pressure relay; 11-2, the second pressure relay; 12-1, the first operating side upper support roller balancing cylinder; 12-2, the second operating side upper support roller balancing cylinder; 12-3, the first transmission side upper support roller balancing cylinder; 12-4, the second transmission side upper support roller balancing cylinder; Ps-total oil supply port; T-total oil return port. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] according to Figure 1 The six-roller plate and strip rolling mill upper support roller balancing circuit shown in the figure includes a first electromagnetic reversing valve 4-1, a zero-leakage electromagnetic lock valve 5, a first two-way flow control valve 7-1, a second two-way flow control valve 7-2, a first rectifying superposition plate 8-1, a second rectifying superposition plate 8-2, an operating side upper support roller balancing cylinder, a transmission side upper support roller balancing cylinder, a total oil supply port Ps and a total oil return port T; the total oil supply port Ps is connected to the inlet of the zero-leakage electromagnetic lock valve 5 through the first electromagnetic reversing valve 4-1, and the outlet of the zero-leakage electromagnetic lock valve 5 is connected to the inlet of the zero-leakage electromagnetic lock valve 5. The first rectifying superposition plate 8-1 is connected to the plug cavity of the support roller balancing cylinder on the operating side through the first two-way flow control valve 7-1, and the second rectifying superposition plate 8-2 is connected to the plug cavity of the support roller balancing cylinder on the transmission side through the second two-way flow control valve 7-2. The rod cavity of the support roller balancing cylinder on the operating side and the rod cavity of the support roller balancing cylinder on the transmission side are connected to the first electromagnetic reversing valve 4-1, and the total oil return port T is connected to the first electromagnetic reversing valve 4-1.

[0026] In actual use, high-pressure hydraulic oil is supplied from the power station to the first electromagnetic reversing valve 4-1 through the main oil supply port Ps; when the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side need to be balanced, the electromagnet YB1 of the electromagnetic reversing valve 4-1 is energized, and the electromagnet YA3 of the zero-leakage electromagnetic lock valve 5 is energized. The high-pressure hydraulic oil passes through the electromagnetic reversing valve 4-1, the zero-leakage electromagnetic lock valve 5, the first two-way flow control valve 7-1, the second two-way flow control valve 7-2, the first rectifying superposition plate 8-1 and the second rectifying superposition plate 8-2, and then is supplied to the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side. The first two-way flow control valve 7-1 and the second two-way flow control valve 7-2 cooperate with the first rectifying superposition plate 8-1 and the second rectifying superposition plate 8-2 to adjust the movement speed and synchronization accuracy of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side.

[0027] In the technical solution, the upper support roller balancing cylinder is composed of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side. The zero leakage electromagnetic lock valve 5 of the present invention is used to cut off or connect the electromagnetic reversing valve 4-1 with the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side, and is used to maintain the long-term position of the support roller when the machine is shut down.

[0028] By adopting the technical solution of the present invention, the movement speeds of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side can be adjusted separately, which is easy to achieve synchronization and avoids accidents such as upper support roller tilting during roller changing.

[0029] Embodiment 2:

[0030] according to Figure 1 The support roller balancing circuit on a six-roll plate and strip rolling mill shown in the figure is different from the embodiment 1 in that it also includes a pressure reducing valve 2; the inlet of the pressure reducing valve 2 is connected to the main oil supply port Ps, the outlet of the pressure reducing valve 2 is connected to the first electromagnetic reversing valve 4-1, and the oil drain port of the pressure reducing valve 2 is connected to the main oil return port T.

[0031] Preferably, it also includes a pressure measuring component 3; the pressure measuring component 3 is connected to the pressure reducing valve 2 and is used to measure the working pressure of the upper support roller balancing circuit.

[0032] In actual use, the technical solution of setting the pressure reducing valve 2 can reduce the main oil supply pressure Ps to the working pressure required for the upper support roller balancing circuit to balance, thereby ensuring that the entire upper support roller balancing circuit can operate safely and smoothly.

[0033] The setting of the pressure measuring component 3 can measure the working pressure of the upper support roller balancing circuit through the pressure measuring component 3, which is convenient for observing and mastering the oil supply pressure condition of the upper support roller balancing circuit of the six-roll plate and strip rolling mill at any time, so that the upper support roller balancing circuit can always maintain a good working condition.

[0034] Embodiment three:

[0035] according to Figure 1 The support roller balancing circuit on a six-roller plate and strip rolling mill shown in the figure is different from the embodiment 1 in that it also includes a first ball valve 1-1, a second ball valve 1-2, a third ball valve 10-1, a fourth ball valve 10-2 and a fifth ball valve 10-3; the first ball valve 1-1 is connected to the pipeline connecting the main oil supply port Ps and the first electromagnetic reversing valve 4-1; the second ball valve 1-2 is connected to the main oil return port T; the third ball valve 10-1 is connected to the pipeline between the first rectifying superposition plate 8-1 and the support roller balancing cylinder on the operating side, the fourth ball valve 10-2 is connected to the pipeline connecting the second rectifying superposition plate 8-2 and the support roller balancing cylinder on the transmission side, and the fifth ball valve 10-3 is connected to the pipeline connecting the rod cavity of the support roller balancing cylinder on the operating side and the rod cavity of the support roller balancing cylinder on the transmission side and the first electromagnetic reversing valve 4-1.

[0036] In actual use, the third ball valve 10-1 and the fourth ball valve 10-2 are respectively used to cut off and connect the plug chamber of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side and their oil supply, the fifth ball valve 10-3 is used to cut off and connect the rod chamber of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side and their oil supply, the first ball valve 1-1 and the second ball valve 1-2 are used to isolate the total oil supply port Ps and the total oil return port T during maintenance.

[0037] The technical solution of the present invention is adopted to make the maintenance of the present invention more convenient.

[0038] Embodiment 4:

[0039] according to Figure 1 The support roller balancing circuit on a six-roller plate and strip rolling mill shown in the figure is different from the embodiment 1 in that it also includes a relief valve 6, a superimposed relief valve 9 and a second electromagnetic reversing valve 4-2; the inlet of the relief valve 6 is connected to the outlet of the zero-leakage electromagnetic lock valve 5, the outlet of the relief valve 6 is connected to the total oil return port T, and the oil drain port of the relief valve 6 is connected to the second electromagnetic reversing valve 4-2; the working oil ports A and B of the second electromagnetic reversing valve 4-2 are connected to the total oil return port T through the superimposed relief valve 9.

[0040] In actual use, the relief valve 6 is used to achieve the primary pressure of the upper support roller balancing circuit. When the electromagnets YA2 and YB2 of the second electromagnetic reversing valve 4-2 are not energized, the balancing pressure of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side is the reduced pressure determined by the pressure reducing valve 2. The primary pressure set by the relief valve 6 is used for pressure protection during the balancing process. When YA2 is working, the balancing pressure of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side is the secondary pressure determined by the working oil port B of the superimposed relief valve 9. When YB2 is working, the balancing pressure of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side is the tertiary pressure determined by the working oil port A of the superimposed relief valve 9. In the three-level pressure setting, the first-level pressure must be higher than the second-level and third-level pressures for normal rolling. The balancing force achieved by the second-level and third-level pressures set at the working oil ports A and B of the superimposed relief valve 9 is less than the weight of the support roller. During the roll change process, the second-level or third-level pressure is selected according to actual needs. At this time, the balancing force of the upper support roller balancing cylinder is less than the weight of the upper support roller. The upper support roller falls under the combined force of the upper support roller gravity and the balancing force of the upper support roller balancing cylinder. Due to the balancing effect of the second-level or third-level balancing force of the upper support roller balancing cylinder, most of the weight of the upper support roller can be offset, avoiding the possibility of the upper support roller weight being completely pressed on the upper intermediate roller to form a roller mark. When shutting down, the electromagnet YA3 of the zero-leakage electromagnetic lock valve 5 loses power, and the zero-leakage electromagnetic lock valve 5 cuts off the connection between the upper support roller balancing cylinder plug cavity and the oil supply circuit. Due to the zero-leakage characteristic of the zero-leakage electromagnetic lock valve 5, the balanced position of the upper support roller can be maintained for a long time.

[0041] The overflow valve 6 is used to realize the primary pressure of the upper support roller balancing circuit, and the superimposed overflow valve 9 cooperates with the second electromagnetic reversing valve 4-2 to realize the secondary pressure and tertiary pressure of the upper support roller balancing circuit.

[0042] By using the technical solution of the present invention, the balancing pressure of the upper support roller balancing cylinder can be controlled in three levels, and different balancing pressures are used to achieve different functions according to different working conditions. When the machine is stopped, the upper support roller can maintain a balanced position for a long time, effectively reducing the possibility of the upper support roller weight completely pressing on the upper intermediate roller to produce roller marks, thereby improving the finished product quality of the rolled strip.

[0043] Embodiment five:

[0044] according to Figure 1 The support roller balancing circuit on a six-roll plate and strip rolling mill shown in the figure is different from the embodiment 1 in that it also includes a first pressure relay 11-1 and a second pressure relay 11-2; the first pressure relay 11-1 is arranged between the zero-leakage electromagnetic lock valve 5 and the first rectifier stacking plate 8-1 and the second rectifier stacking plate 8-2; the second pressure relay 11-2 is arranged between the support roller balancing cylinder rod cavity on the operating side, the support roller balancing cylinder rod cavity on the transmission side and the first electromagnetic reversing valve 4-1.

[0045] In actual use, the first pressure relay 11-1 is used to detect and send signals of the plug cavity pressure of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side, and the second pressure relay 11-2 is used to detect and send signals of the rod cavity pressure of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side. When the pressure of the first pressure relay 11-1 and the second pressure relay 11-2 does not match the working status, a signal is sent to remind the operator to check.

[0046] The setting of the first pressure relay 11-1 and the second pressure relay 11-2 can grasp the pressure conditions of the plug cavity and the rod cavity of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side in real time, which is convenient for timely adjustment and maintenance.

[0047] Embodiment six:

[0048] according to Figure 1 The upper support roller balancing circuit of a six-roll plate and strip rolling mill shown in the figure is different from that of the first embodiment in that: the upper support roller balancing cylinder on the operating side includes a first upper support roller balancing cylinder 12-1 on the operating side and a second upper support roller balancing cylinder 12-2 on the operating side; the first upper support roller balancing cylinder 12-1 on the operating side and the second upper support roller balancing cylinder 12-2 on the operating side are connected in parallel.

[0049] Preferably, the transmission side upper balancing cylinder comprises a first transmission side upper support roller balancing cylinder 12-3 and a second transmission side upper support roller balancing cylinder 12-4; the first transmission side upper support roller balancing cylinder 12-3 and the second transmission side upper support roller balancing cylinder 12-4 are connected in parallel.

[0050] In actual use, the support roller balancing cylinder 12-1 on the first operating side and the support roller balancing cylinder 12-2 on the second operating side, and the support roller balancing cylinder 12-3 on the first transmission side and the support roller balancing cylinder 12-4 on the second transmission side are respectively connected in parallel, which can not only ensure the synchronous control of the balancing cylinders on this side, but also the parallel connection can simplify the intermediate pipeline.

[0051] Embodiment seven:

[0052] according to Figure 1The balancing circuit of the support roller on the six-roller plate and strip rolling mill shown in the figure is different from the first embodiment in that it also includes a pressure reducing valve 2, a first ball valve 1-1, a second ball valve 1-2, a third ball valve 10-1, a fourth ball valve 10-2, a fifth ball valve 10-3, an overflow valve 6, a stacked overflow valve 9, a second electromagnetic reversing valve 4-2, a pressure measuring component 3, a first pressure relay 11-1 and a second pressure relay 11-2; the inlet of the pressure reducing valve 2 is connected to the main oil supply port Ps, the outlet of the pressure reducing valve 2 is connected to the first electromagnetic reversing valve 4-1, and the oil drain port of the pressure reducing valve 2 is connected to the main oil return port T; the first ball valve 1- 1 is connected to the pipeline connecting the main oil supply port Ps and the first electromagnetic reversing valve 4-1; the second ball valve 1-2 is connected to the main oil return port T; the third ball valve 10-1 is connected to the pipeline between the first rectifying stacking plate 8-1 and the support roller balancing cylinder on the operating side, the fourth ball valve 10-2 is connected to the pipeline connecting the second rectifying stacking plate 8-2 and the support roller balancing cylinder on the transmission side, and the fifth ball valve 10-3 is connected to the pipeline connecting the rod chamber of the support roller balancing cylinder on the operating side and the rod chamber of the support roller balancing cylinder on the transmission side and the first electromagnetic reversing valve 4-1; the inlet of the overflow valve 6 is connected to the zero leakage electric The outlet of the magnetic lock valve 5 is connected, the outlet of the relief valve 6 is connected to the total oil return port T, and the oil drain port of the relief valve 6 is connected to the second electromagnetic reversing valve 4-2; the working oil ports A and B of the second electromagnetic reversing valve 4-2 are connected to the total oil return port T through the superimposed relief valve 9; the pressure measuring component 3 is connected to the pressure reducing valve to measure the working pressure of the upper support roller balancing circuit; the first pressure relay 11-1 is arranged between the zero leakage electromagnetic lock valve 5 and the first rectifier superposition plate 8-1 and the second rectifier superposition plate 8-2; the second pressure relay 11-2 is arranged on the operating side upper support roller balancing cylinder rod cavity, the transmission side upper support roller Between the balancing cylinder rod cavity and the first electromagnetic reversing valve 4-1; the support roller balancing cylinder on the operating side includes the first support roller balancing cylinder 12-1 on the operating side and the second support roller balancing cylinder 12-2 on the operating side; the first support roller balancing cylinder 12-1 on the operating side and the second support roller balancing cylinder 12-2 on the operating side are connected in parallel; the support roller balancing cylinder on the transmission side includes the first support roller balancing cylinder 12-3 on the transmission side and the second support roller balancing cylinder 12-4 on the transmission side; the first support roller balancing cylinder 12-3 on the transmission side and the second support roller balancing cylinder 12-4 on the transmission side are connected in parallel.

[0053] In actual use, high-pressure hydraulic oil is supplied from the power station to the main oil supply port Ps, and is supplied to the first electromagnetic reversing valve 4-1 after being reduced in pressure by the pressure reducing valve 2. When the upper support roller needs to be balanced, the electromagnet YB1 of the first electromagnetic reversing valve 4-1 is energized, and the electromagnet YA3 of the zero-leakage electromagnetic lock valve 5 is energized. The high-pressure hydraulic oil passes through the pressure reducing valve 2, the first electromagnetic reversing valve 4-1, the zero-leakage electromagnetic lock valve 5, the first two-way flow control valve 7-1 and the second two-way flow control valve 7-2 and the first rectifying superposition plate 8-1 and the second rectifying superposition plate 8-2 and is supplied to the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side. The first two-way flow control valve 7-1 and the second two-way flow control valve 7-2 and the first rectifying superposition plate 8-1 and the second rectifying superposition plate 8-2 Plate 8-2 is respectively used to adjust the speed and synchronization accuracy of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side. When the electromagnets YA2 and YB2 of the second electromagnetic reversing valve 4-2 are not energized, the balancing pressure of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side is the reduced pressure determined by the pressure reducing valve 2. The first-level pressure set by the relief valve 6 is used for pressure protection during the balancing process. When YA2 is working, the balancing pressure of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side is the second-level pressure determined by the working oil port B of the superimposed relief valve 9. When YB2 is working, the balancing pressure of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side is the third-level pressure determined by the working oil port A of the superimposed relief valve 9. In the three-level pressure setting, the first-level pressure must be higher than the second-level and third-level pressures, which are used for normal rolling. The balancing force achieved by the second-level and third-level pressures set by the working oil ports A and B of the superimposed relief valve 9 is less than the weight of the upper support roller. In the process of changing the rollers, the second-level or third-level pressure is selected according to actual needs. At this time, the balancing force of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side is less than the weight of the support roller. The upper support roller falls under the combined force of the upper support roller gravity and the balancing force. Due to the balancing effect of the second-level or third-level balancing force of the upper support roller balancing cylinder, most of the weight of the upper support roller can be offset, avoiding the possibility of the upper support roller weight being completely pressed on the upper intermediate roller to form a roller mark. When shutting down, the electromagnet YA3 of the zero-leakage electromagnetic lock valve 5 loses power, and the zero-leakage electromagnetic lock valve 5 cuts off the connection between the plug cavity of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side and the oil supply circuit. Due to the zero-leakage characteristic of the zero-leakage electromagnetic lock valve, the balanced position of the upper support roller can be maintained for a long time. Pressure relay 11-1 is used for detecting and sending signals of the pressure in the plug cavity of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side. Pressure relay 11-2 is used for detecting and sending signals of the pressure in the rod cavity of the support roller balancing cylinder on the operating side and the support roller balancing cylinder on the transmission side. When it is found that the pressure does not match the working status, a signal is sent to remind the operator to check.

[0054] The third ball valve 10-1 and the fourth ball valve 10-2 are used to cut off and connect the plug chamber of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side with their oil supply, respectively. The fifth ball valve 10-3 is used to cut off and connect the rod chamber of the upper support roller balancing cylinder on the operating side and the upper support roller balancing cylinder on the transmission side with their oil supply. The first ball valve 1-1 and the second ball valve 1-2 are used to cut off the total oil supply port Ps and the total oil return port T when inspecting the upper support roller balancing circuit; the pressure reducing valve 2 is used to reduce the pressure of the upper support roller balancing circuit from the main oil supply pressure Ps to the working pressure required by the balancing circuit pressure; the first electromagnetic reversing valve 4-1 is used to control the balance and fall of the upper support roller, and the second electromagnetic reversing valve 4-2 is used to realize the various levels of balance pressure of the upper support roller balance circuit; the zero-leakage electromagnetic lock valve 5 is used to maintain the balance position of the upper support roller for a long time during shutdown; the overflow valve 6 is used to realize the primary pressure of the upper support roller balance circuit; the superimposed overflow valve 9 is used to realize the secondary and tertiary pressures of the upper support roller balance circuit; the cooperation of the superimposed overflow valve 9 and the second electromagnetic reversing valve 4-2 realizes the secondary and tertiary pressure control of the upper support roller balance circuit.

[0055] In summary, the present invention is organically composed of five ball valves, a pressure reducing valve, a pressure measuring assembly, two electromagnetic reversing valves, a zero-leakage electromagnetic lock valve, a relief valve, two two-way flow control valves, two first rectifier superimposed plates, a superimposed relief valve, two pressure relays, two operating-side upper support roller balancing cylinders, and two transmission-side upper support roller balancing cylinders. The movement speeds of the operating-side upper support roller balancing cylinder and the transmission-side upper support roller balancing cylinder of the present invention are conveniently adjusted synchronously, thus avoiding accidents such as the upper support roller tilting during the roller changing process. The upper support roller balancing cylinder can achieve three different balancing pressures, thus reducing the possibility of roller marks caused by the weight of the upper support roller being completely pressed on the upper intermediate roller. During shutdown, the upper support roller position can maintain the upper support roller balanced position for a long time, thus effectively ensuring the finished product quality of the rolled strip.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0057] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0058] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0059] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0060] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A balancing circuit for support rolls on a six-roller strip mill, characterized in that: The invention comprises a first electromagnetic reversing valve (4-1), a zero leakage electromagnetic lock valve (5), a first two-way flow control valve (7-1), a second two-way flow control valve (7-2), a first rectifying stacking plate (8-1), a second rectifying stacking plate (8-2), an upper support roller balancing cylinder on the operating side, an upper support roller balancing cylinder on the transmission side, a total oil supply port (Ps) and a total oil return port (T); the total oil supply port (Ps) is connected to the inlet of the zero leakage electromagnetic lock valve (5) through the first electromagnetic reversing valve (4-1), and the outlet of the zero leakage electromagnetic lock valve (5) is respectively connected to the first rectifying stacking plate (8-1), the outlet of the zero leakage electromagnetic lock valve (5) is respectively connected to the outlet of the first rectifying stacking plate (8-2), the outlet of the zero leakage electromagnetic lock valve (5) is respectively connected to the outlet of ... The adding plate (8-1) is connected to the second rectifying superposition plate (8-2); the first rectifying superposition plate (8-1) is connected to the plug cavity of the support roller balancing cylinder on the operating side through a first two-way flow control valve (7-1), the second rectifying superposition plate (8-2) is connected to the plug cavity of the support roller balancing cylinder on the transmission side through a second two-way flow control valve (7-2), the rod cavity of the support roller balancing cylinder on the operating side and the rod cavity of the support roller balancing cylinder on the transmission side are connected to the first electromagnetic reversing valve (4-1), and the total oil return port (T) is connected to the first electromagnetic reversing valve (4-1); It also includes a pressure reducing valve (2); the inlet of the pressure reducing valve (2) is connected to the main oil supply port (Ps), the outlet of the pressure reducing valve (2) is connected to the first electromagnetic reversing valve (4-1), and the oil drain port of the pressure reducing valve (2) is connected to the main oil return port (T); It also includes a first ball valve (1-1), a second ball valve (1-2), a third ball valve (10-1), a fourth ball valve (10-2) and a fifth ball valve (10-3); the first ball valve (1-1) is connected to the pipeline connecting the main oil supply port (Ps) and the first electromagnetic reversing valve (4-1); the second ball valve (1-2) is connected to the main oil return port (T); the third ball valve (10-1) is connected to the pipeline between the first rectifying stacking plate (8-1) and the support roller balancing cylinder on the operating side; the fourth ball valve (10-2) is connected to the pipeline connecting the second rectifying stacking plate (8-2) and the support roller balancing cylinder on the transmission side; and the fifth ball valve (10-3) is connected to the pipeline connecting the rod cavity of the support roller balancing cylinder on the operating side and the rod cavity of the support roller balancing cylinder on the transmission side and the first electromagnetic reversing valve (4-1).

2. A six-high strip mill upper support roll balancing circuit as claimed in claim 1, characterized in that: It also includes a pressure measuring component (3); the pressure measuring component (3) is connected to the pressure reducing valve (2) and is used to measure the working pressure of the upper support roller balancing circuit.

3. A six-high strip mill upper support roll balancing circuit as claimed in claim 1 or 2, characterized in that: It also includes a relief valve (6), a stacked relief valve (9) and a second electromagnetic reversing valve (4-2); the inlet of the relief valve (6) is connected to the outlet of the zero-leakage electromagnetic lock valve (5), the outlet of the relief valve (6) is connected to the total oil return port (T), and the oil drain port of the relief valve (6) is connected to the second electromagnetic reversing valve (4-2); the working oil ports A and B of the second electromagnetic reversing valve (4-2) are connected to the total oil return port (T) via the stacked relief valve (9).

4. A six-high strip mill upper support roll balancing circuit as claimed in claim 1 or 2, characterized in that: It also includes a first pressure relay (11-1) and a second pressure relay (11-2); the first pressure relay (11-1) is arranged between the zero-leakage electromagnetic lock valve (5) and the first rectifying stacking plate (8-1) and the second rectifying stacking plate (8-2); the second pressure relay (11-2) is arranged between the supporting roller balancing cylinder rod cavity on the operating side, the supporting roller balancing cylinder rod cavity on the transmission side and the first electromagnetic reversing valve (4-1).

5. A six-high strip mill upper support roll balancing circuit as claimed in claim 1, characterized in that: The operating side upper support roller balancing cylinder comprises a first operating side upper support roller balancing cylinder (12-1) and a second operating side upper support roller balancing cylinder (12-2); the first operating side upper support roller balancing cylinder (12-1) and the second operating side upper support roller balancing cylinder (12-2) are connected in parallel.

6. A six-high strip mill upper support roll balancing circuit as claimed in claim 1, characterized in that: The transmission side upper support roller balancing cylinder comprises a first transmission side upper support roller balancing cylinder (12-3) and a second transmission side upper support roller balancing cylinder (12-4); the first transmission side upper support roller balancing cylinder (12-3) and the second transmission side upper support roller balancing cylinder (12-4) are connected in parallel.

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