Hydraulic control loop and roll changing turnover device

Abstract

The utility model discloses a hydraulic control loop. The technical problem that in the prior art, a roller changing turnover device is poor in stability in the roller changing operation is solved. The hydraulic control loop comprises a reversing valve, a first hydraulic cylinder and a second hydraulic cylinder, the reversing valve is provided with a first port, a second port, a third port and a fourth port, the first port and the second port of the reversing valve are connected with an oil storage device, the third port of the reversing valve is connected with a first oil way, and the fourth port of the reversing valve is connected with a second oil way. Throttle valves are arranged on the first oil way and the second oil way; the two ends of the first hydraulic cylinder communicate with the first oil way and the second oil way correspondingly. The two ends of the second hydraulic cylinder communicate with the first oil way and the second oil way correspondingly, and the second hydraulic cylinder is connected with the first hydraulic cylinder in parallel. The roll changing turnover device comprises a hydraulic control loop. The hydraulic control loop and the roll changing turnover device are high in stability.

Description

Technical Field

[0001] The present application belongs to the technical field of continuous casting equipment, and specifically relates to a hydraulic control circuit and a roll changing and turning device. Background Art

[0002] Among the equipment of the rolling mill in the fully continuous casting and rolling production line, the working roll changing and flipping device is an important device for replacing the working rolls. The working roll changing and flipping device control circuit drives the flipping plate to flip by a hydraulic cylinder to replace the working rolls. However, the existing working roll changing and flipping device only uses one hydraulic cylinder, and has poor stability during the roll changing operation. Summary of the invention

[0003] In order to solve the technical problem that the current roll changing and flipping device has poor stability during the roll changing operation, the present application provides a hydraulic control circuit and a roll changing and flipping device.

[0004] In a first aspect of the present application, a hydraulic control circuit is provided, comprising:

[0005] A reversing valve is provided with two switchable parallel positions and a cross position, the reversing valve has a first port, a second port, a third port and a fourth port, when the reversing valve is in the parallel position, the first port and the third port are connected, and the second port and the fourth port are connected; when the reversing valve is in the cross position, the first port and the fourth port are connected, and the second port and the third port are connected; the first port and the second port of the reversing valve are connected to an oil storage device, the third port of the reversing valve is connected to a first oil circuit, and the fourth port of the reversing valve is connected to a second oil circuit;

[0006] The first hydraulic cylinder and the second hydraulic cylinder respectively support the two sides of the flip plate along the axial direction of the flip axis, and the two ends of the first hydraulic cylinder are respectively connected to the first oil circuit and the second oil circuit; the two ends of the second hydraulic cylinder are respectively connected to the first oil circuit and the second oil circuit, and the second hydraulic cylinder is connected in parallel with the first hydraulic cylinder.

[0007] In some embodiments, a first oil inlet throttle valve and a first oil return throttle valve are connected in series in the first oil circuit; the first oil inlet throttle valve and the first oil return throttle valve are both one-way throttle valves, and the throttling directions of the first oil inlet throttle valve and the first oil return throttle valve are opposite;

[0008] A second oil inlet throttle valve and a second oil return throttle valve are connected in series in the second oil circuit; the second oil inlet throttle valve and the second oil return throttle valve are both one-way throttle valves, and the throttling directions of the second oil inlet throttle valve and the second oil return throttle valve are opposite.

[0009] In some embodiments, the hydraulic control circuit also includes a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve, the first hydraulically controlled one-way valve is connected in parallel with the first hydraulic cylinder, and the first hydraulically controlled one-way valve is connected to the plug chamber of the first hydraulic cylinder through a pipeline; the second hydraulically controlled one-way valve is connected in parallel with the second hydraulic cylinder, and the second hydraulically controlled one-way valve is connected to the plug chamber of the second hydraulic cylinder through a pipeline; the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve are both connected to the oil storage device.

[0010] In some embodiments, a pressure detection port is provided between the first hydraulically controlled one-way valve and the first hydraulic cylinder;

[0011] A pressure detection port is provided between the second hydraulically controlled one-way valve and the second hydraulic cylinder.

[0012] In some embodiments, flow meters are disposed on both the first oil circuit and the second oil circuit.

[0013] In some embodiments, a pressure detection port is disposed on both the first oil circuit and the second oil circuit.

[0014] In some embodiments, ball valves are disposed on both the first oil circuit and the second oil circuit.

[0015] In some embodiments, the reversing valve is also provided with a middle position, which can be switched between a parallel position and a cross position. The reversing valve has a fifth port. When the reversing valve is in the parallel position, the third port and the fourth port are only connected to the fifth port. The fifth port of the reversing valve is connected to an oil drain pipe.

[0016] In a second aspect of the present application, a roll changing and turning device is provided, comprising the hydraulic control circuit.

[0017] In some embodiments, the roller changing and flipping device comprises:

[0018] Flip axis;

[0019] The flip plate is used to support the working roll and is rotatably connected to the flip shaft. The first hydraulic cylinder and the second hydraulic cylinder are connected to the flip plate, and the first hydraulic cylinder and the second hydraulic cylinder respectively support the flip plate on both sides of the axial direction of the flip shaft.

[0020] The hydraulic control circuit and roll changing and flipping device provided according to one or more embodiments of the present application have two hydraulic cylinders, and the two hydraulic cylinders are used to support the same flip plate of the roll changing and flipping device. The telescopic rods of the hydraulic cylinders are connected to the flip plate, that is, when the roll changing and flipping device drives the hydraulic cylinders to rotate, the hydraulic control circuit provides two fulcrums for the flip plate. When dealing with working rolls with longer lengths, when the hydraulic control circuit provided by the present application drives the flip plate of the roll changing and flipping device to rotate, the flip plate has high stability, and the flip plate and the working rolls thereon are not easy to shake, and the safety is correspondingly improved. At the same time, by providing two hydraulic cylinders, when placing the working roll on the flip plate, there is no need to spend too much time aligning the working roll with the middle of the flip plate, thereby reducing the operation time and improving the efficiency of the roll changing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a hydraulic control circuit in one or more embodiments of the present application is shown.

[0022] Explanation of the accompanying drawings: 1-reversing valve, 2-first oil inlet throttle valve, 3-second oil inlet throttle valve, 4-first oil return throttle valve, 5-second oil return throttle valve, 6-first hydraulically controlled one-way valve, 7-second hydraulically controlled one-way valve, 8-first hydraulic cylinder, 9-second hydraulic cylinder, 11-first oil circuit, 12-second oil circuit, 13-pressure detection port, 14-flow meter, 15-ball valve, 16-oil drain pipe. DETAILED DESCRIPTION

[0023] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] See also Figure 1 According to a first aspect of the present application, a hydraulic control circuit is provided for use in a roll changing and flipping device. The roll changing and flipping device comprises a flipping plate. The working rolls of the rolling mill are placed on the flipping plate. The angle of the flipping plate can be changed by flipping the hydraulic control circuit, thereby flipping the working rolls.

[0025] The hydraulic control circuit includes a reversing valve 1, a first hydraulic cylinder 8 and a second hydraulic cylinder 9, wherein the first hydraulic cylinder 8 and the second hydraulic cylinder 9 are both used to support the same turning plate of the roll-changing turning device.

[0026] The function of the reversing valve 1 is mainly to control the connection, disconnection or change the direction of flow of hydraulic oil in the oil circuit connected to it by changing the relative position between the valve core and the valve body. In the present application, the reversing valve 1 is provided with two switchable parallel positions and cross positions. The reversing valve 1 has a first port, a second port, a third port and a fourth port. When the reversing valve 1 is in the parallel position, the first port and the third port are connected, and the second port and the fourth port are connected; when the reversing valve 1 is in the cross position, the first port and the fourth port are connected, and the second port and the third port are connected.

[0027] The first port and the second port of the reversing valve 1 are connected to an oil storage device, and the oil storage device can be any device that can store hydraulic oil and input the hydraulic oil into the hydraulic control circuit.

[0028] The third port of the reversing valve 1 is connected to the first oil circuit 11, and the fourth port of the reversing valve 1 is connected to the second oil circuit 12. Throttle valves are provided on the first oil circuit 11 and the second oil circuit 12 to adjust the flow rate of the hydraulic oil in the first oil circuit 11 and the second oil circuit 12.

[0029] Both ends of the first hydraulic cylinder 8 are connected to the first oil circuit 11 and the second oil circuit 12 respectively; both ends of the second hydraulic cylinder 9 are connected to the first oil circuit 11 and the second oil circuit 12 respectively, and the second hydraulic cylinder 9 is connected in parallel with the first hydraulic cylinder 8 .

[0030] The reversing valve 1 can change the flow direction of the hydraulic oil in the first oil circuit 11 and the second oil circuit 12 by changing the position of the flow channel inside it. Specifically, the flow channel inside the reversing valve 1 can be operated to be parallel and crossed. When the flow channel in the reversing valve 1 is in the parallel position, the hydraulic oil in the oil storage device passes through the reversing valve 1 and then enters the first hydraulic cylinder 8 and the second hydraulic cylinder 9 from the first oil circuit 11 and passes through the reversing valve 1 again from the second oil circuit 12, and finally returns to the oil storage device. At this time, the first hydraulic cylinder 8 and the second hydraulic cylinder 9 are in an extended state.

[0031] When the flow channel in the reversing valve 1 is in the cross position, the hydraulic oil in the oil storage device passes through the reversing valve 1 and enters the first hydraulic cylinder 8 and the second hydraulic cylinder 9 from the second oil circuit 12, passes through the reversing valve 1 again from the first oil circuit 11, and finally returns to the oil storage device. At this time, the first hydraulic cylinder 8 and the second hydraulic cylinder 9 are in a retracted state.

[0032] The hydraulic control circuit provided in this embodiment has two hydraulic cylinders, and the two hydraulic cylinders are used to support the same flip plate of the roll changing and flipping device. The telescopic rods of the first hydraulic cylinder 8 and the second hydraulic cylinder 9 are both connected to the flip plate, that is, when the roll changing and flipping device drives the flip plate to rotate, the hydraulic control circuit provides two fulcrums for the flip plate. When dealing with working rolls with longer lengths, when the hydraulic control circuit provided in this application drives the flip plate of the roll changing and flipping device to rotate, the flip plate has high stability, and the flip plate and the working rolls thereon are not easy to shake, and the safety is correspondingly improved. At the same time, by providing two hydraulic cylinders, when placing the working roll on the flip plate, there is no need to spend too much time aligning the working roll with the middle of the flip plate, thereby reducing the operation time and improving the efficiency of the roll changing operation.

[0033] In some embodiments, a first oil inlet throttle valve 2 and a first oil return throttle valve 4 are connected in series on the first oil circuit 11; the first oil inlet throttle valve 2 and the first oil return throttle valve 4 are both one-way throttle valves, and the throttling directions of the first oil inlet throttle valve 2 and the first oil return throttle valve 4 are opposite.

[0034] The second oil circuit 12 is connected in series with a second oil inlet throttle valve 3 and a second oil return throttle valve 5 ; both the second oil inlet throttle valve 3 and the second oil return throttle valve 5 are one-way throttle valves, and the throttling directions of the second oil inlet throttle valve 3 and the second oil return throttle valve 5 are opposite.

[0035] The throttling direction is the flow direction in which the one-way throttle valve can limit the flow. The throttling directions of the two one-way throttle valves in the same oil circuit are opposite, that is, in the same oil circuit, regardless of whether the flow directions of the fluids are opposite, the flow rate of the fluids can be limited.

[0036] The one-way throttle valve can throttle the fluid in one direction to control the fluid flow in that direction. When the fluid moves in the opposite direction, the fluid flow is no longer restricted by the one-way throttle valve. By setting two one-way throttle valves in throttling directions on the first oil circuit 11, no matter the flow direction of the hydraulic oil in the first oil circuit 11, there will be a one-way throttle valve that can limit the flow of the hydraulic oil in the first oil circuit 11, thereby controlling the flow rate of the hydraulic oil in the first oil circuit 11; similarly, the flow rate of the hydraulic oil in the second oil circuit 12 will also be affected by the second oil inlet throttle valve 3 and the second oil return throttle valve 5. For working rolls of different specifications, the flow rate of the hydraulic oil in the first oil circuit 11 and the second oil circuit 12 is adjusted to make the roll changing process smoother, and the flip plate is not prone to sudden stop and start, and the flip plate has high stability.

[0037] The hydraulic control circuit also includes a first hydraulically controlled one-way valve 6 and a second hydraulically controlled one-way valve 7. The first hydraulically controlled one-way valve 6 is connected in parallel with the first hydraulic cylinder 8, and the first hydraulically controlled one-way valve 6 is connected to the plug chamber of the first hydraulic cylinder 8 through a pipeline, so that the first hydraulically controlled one-way valve 6 can form a hydraulic lock for the plug chamber of the first hydraulic cylinder 8; the second hydraulically controlled one-way valve 7 is connected in parallel with the second hydraulic cylinder 9, and the second hydraulically controlled one-way valve 7 is connected to the plug chamber of the second hydraulic cylinder 9 through a pipeline, so that the second hydraulically controlled one-way valve 7 can form a hydraulic lock for the plug chamber of the second hydraulic cylinder 9, wherein the pipeline is an oil circuit through which the hydraulic oil flows.

[0038] A hydraulically controlled one-way valve is a valve that controls fluid pressure and allows reverse flow of the one-way valve. The first hydraulically controlled one-way valve 6 is used to lock the plug chamber of the first hydraulic cylinder 8. The plug chamber of the first hydraulic cylinder 8 is a working chamber. Under the action of the first hydraulically controlled one-way valve 6, even if the plug chamber of the first hydraulic cylinder 8 leaks oil, the hydraulic oil in the plug chamber of the first hydraulic cylinder 8 will be locked in the hydraulic cylinder, so that the hydraulic cylinder maintains its current position. Similarly, the second hydraulically controlled one-way valve 7 is used to lock the plug chamber of the second hydraulic cylinder 9. Even if the plug chamber of the second hydraulic cylinder 9 leaks oil, the hydraulic oil in the plug chamber of the second hydraulic cylinder 9 will be locked in the hydraulic cylinder, so that the hydraulic cylinder maintains its current position.

[0039] In some embodiments, the first hydraulically controlled one-way valve 6 and the second hydraulically controlled one-way valve 7 are both connected to the oil storage device, that is, the fluid pressure controlling the hydraulically controlled one-way valve is derived from the oil storage device, so as to reduce the additional device for supplying oil to the first hydraulically controlled one-way valve 6 and the second hydraulically controlled one-way valve 7.

[0040] In some embodiments, flow meters 14 are provided on both the first oil circuit 11 and the second oil circuit 12 to obtain the flow rate of the hydraulic oil in the first oil circuit 11 and the second oil circuit 12 so that operators can understand the operating status of the hydraulic control circuit.

[0041] In some embodiments, a pressure detection port 13 is provided between the first hydraulically controlled one-way valve 6 and the first hydraulic cylinder 8; a pressure detection port 13 is provided between the second hydraulically controlled one-way valve 7 and the second hydraulic cylinder 9. Pressure detection ports 13 are provided on both the first oil circuit 11 and the second oil circuit 12.

[0042] The pressure detection port 13 is a port for detecting the pressure between the first oil circuit 11, the second oil circuit 12, the first hydraulically controlled one-way valve 6 and the first hydraulic cylinder 8, and the second hydraulically controlled one-way valve 7 and the second hydraulic cylinder 9. For example, the pressure detection port 13 can be installed with a pressure measuring device such as a Bourdon tube pressure gauge.

[0043] In some embodiments, a ball valve 15 is provided on both the first oil circuit 11 and the second oil circuit 12 for shutting off the first oil circuit 11 and the second oil circuit 12 to facilitate maintenance of the entire hydraulic control circuit.

[0044] In some embodiments, the reversing valve 1 is also provided with a middle position, which can be switched with the parallel position and the cross position. The reversing valve 1 has a fifth port. When the reversing valve 1 is in the parallel position, the third port and the fourth port are only connected to the fifth port. The fifth port of the reversing valve 1 is connected to the drain pipe 16. When the reversing valve 1 is in the middle position, the first port and the second port cannot be connected with the third port or the fourth port. At this time, the hydraulic oil in the first oil circuit 11 and the hydraulic oil in the second oil circuit 12 will enter the drain pipe 16 through the reversing valve 1. At this time, the hydraulic control circuit will no longer control the first hydraulic cylinder 8 and the second hydraulic cylinder 9, and the hydraulic control circuit will be in a closed state. Of course, the drain pipe 16 is also convenient for replacing the hydraulic oil in the entire hydraulic control circuit.

[0045] Based on the same inventive concept, the second aspect embodiment of the present application provides a roller changing and flipping device. Because the roller changing and flipping device has the same characteristics as the first aspect embodiment of the present application, the second aspect embodiment of the present application has the same beneficial effects as the first aspect embodiment of the present application.

[0046] In certain embodiments, the roll changing and flipping device includes a flip shaft and a flip plate, a platform for mounting the roll changing and flipping device is provided with a groove, the first hydraulic cylinder 8 and the second hydraulic cylinder 9 are both arranged in the groove, the flip shaft is horizontally arranged at the notch of the groove, the flip plate is used to support the working roll, and the flip plate is rotatably connected to the flip shaft, and when the flip plate is in the initial state, the top surface of the flip plate is flush with the top surface of the platform.

[0047] The first hydraulic cylinder 8 and the second hydraulic cylinder 9 are connected to the flip plate, and the first hydraulic cylinder 8 and the second hydraulic cylinder 9 respectively support the flip plate on both sides along the axial direction of the flip axis to ensure the stability of the flip plate when it rotates around the flip axis.

[0048] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, the descriptions of "first", "second", etc. in this application 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 one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hydraulic control circuit, characterized in that: include: A reversing valve is provided with two switchable parallel positions and a cross position, the reversing valve has a first port, a second port, a third port and a fourth port, when the reversing valve is in the parallel position, the first port and the third port are connected, and the second port and the fourth port are connected; when the reversing valve is in the cross position, the first port and the fourth port are connected, and the second port and the third port are connected; the first port and the second port of the reversing valve are connected to an oil storage device, the third port of the reversing valve is connected to a first oil circuit, and the fourth port of the reversing valve is connected to a second oil circuit; The first hydraulic cylinder and the second hydraulic cylinder respectively support the two sides of the flip plate along the axial direction of the flip axis, and the two ends of the first hydraulic cylinder are respectively connected to the first oil circuit and the second oil circuit; the two ends of the second hydraulic cylinder are respectively connected to the first oil circuit and the second oil circuit, and the second hydraulic cylinder is connected in parallel with the first hydraulic cylinder.

2. The hydraulic control circuit according to claim 1, characterized in that: The first oil circuit is connected in series with a first oil inlet throttle valve and a first oil return throttle valve; both the first oil inlet throttle valve and the first oil return throttle valve are one-way throttle valves, and the throttling directions of the first oil inlet throttle valve and the first oil return throttle valve are opposite; A second oil inlet throttle valve and a second oil return throttle valve are connected in series in the second oil circuit; the second oil inlet throttle valve and the second oil return throttle valve are both one-way throttle valves, and the throttling directions of the second oil inlet throttle valve and the second oil return throttle valve are opposite.

3. The hydraulic control circuit according to claim 1, characterized in that: The hydraulic control circuit also includes a first hydraulically controlled one-way valve and a second hydraulically controlled one-way valve. The first hydraulically controlled one-way valve is connected in parallel with the first hydraulic cylinder, and the first hydraulically controlled one-way valve is connected to the plug chamber of the first hydraulic cylinder through a pipeline; the second hydraulically controlled one-way valve is connected in parallel with the second hydraulic cylinder, and the second hydraulically controlled one-way valve is connected to the plug chamber of the second hydraulic cylinder through a pipeline; the first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve are both connected to the oil storage device.

4. The hydraulic control circuit according to claim 3, characterized in that: A pressure detection port is provided between the first hydraulically controlled one-way valve and the first hydraulic cylinder; A pressure detection port is provided between the second hydraulically controlled one-way valve and the second hydraulic cylinder.

5. The hydraulic control circuit according to claim 1, characterized in that: Flow meters are provided on both the first oil circuit and the second oil circuit.

6. The hydraulic control circuit according to claim 1, characterized in that: The first oil circuit and the second oil circuit are both provided with pressure detection ports.

7. The hydraulic control circuit according to claim 1, characterized in that: The first oil circuit and the second oil circuit are both provided with ball valves.

8. The hydraulic control circuit according to claim 1, characterized in that: The reversing valve is also provided with a middle position, which can be switched with a parallel position and a cross position. The reversing valve has a fifth port. When the reversing valve is in the parallel position, the third port and the fourth port are only connected to the fifth port. The fifth port of the reversing valve is connected with an oil drain pipe.

9. A roller changing and turning device, characterized in that: Comprising the hydraulic control circuit according to any one of claims 1-8.

10. The roller changing and turning device according to claim 9, characterized in that: The roller changing and turning device comprises: Flip axis; The flip plate is used to support the working roll and is rotatably connected to the flip shaft. The first hydraulic cylinder and the second hydraulic cylinder are connected to the flip plate, and the first hydraulic cylinder and the second hydraulic cylinder respectively support the flip plate on both sides of the axial direction of the flip shaft.

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