A hydraulic device for horizontal movement of cooling bed of continuous casting machine

Abstract

The present invention relates to a hydraulic device for lateral movement of a continuous casting machine turning cooling bed, and belongs to the technical field of continuous casting machine equipment. The technical scheme is as follows: a functional cylinder (6) is composed of two hydraulic cylinders, the two hydraulic cylinders share a cylinder body (30) and a piston rod (25), the piston rod (25) has two pistons, and the two pistons divide the two hydraulic cylinders into four chambers; the two oil outlets of the proportional valve (2) are respectively connected to the double hydraulic control check valve (3), one oil outlet of the double hydraulic control check valve (3) is connected to the two chambers of the functional cylinder (6), the other two chambers of the functional cylinder (6) are respectively connected to one chamber of the two lateral movement hydraulic cylinders, and the other chamber of the two lateral movement hydraulic cylinders is connected to the other oil outlet of the double hydraulic control check valve (3) through a pipeline. The beneficial effects of the present invention are: using the functional hydraulic cylinder as a synchronization element, the synchronization accuracy of the two lateral movement hydraulic cylinders is high, the synchronization effect is stable and reliable, and the displacement error of the two lateral movement hydraulic cylinders can be eliminated.

Description

Technical Field

[0001] The invention relates to a hydraulic device for transverse movement of a turnover cooling bed of a continuous casting machine, belonging to the technical field of continuous casting machine equipment in the metallurgical industry. Background Art

[0002] The hydraulic transverse shift device of the continuous casting machine turning cooling bed is an important equipment for the continuous casting machine production in steel mills. It directly affects the steel production of the continuous casting machine. The transverse shift device of the continuous casting machine turning cooling bed is driven by two transverse shift cylinders. There are mainly several synchronization modes:

[0003] (1) Synchronous axis synchronization: Mechanical synchronization is achieved through the rotation of the traverse axis;

[0004] (2) Closed-loop control synchronization: The two proportional reversing valves perform closed-loop control synchronization separately;

[0005] (3) Synchronous motor synchronization: The synchronous motor controls two lateral hydraulic cylinders at the same time to achieve synchronous operation.

[0006] In the first case, mechanical synchronization is achieved through the rotation of the transverse synchronous shaft. Therefore, this continuous casting machine turning cooling bed transverse shift device requires the cooling bed to have a through shaft, and the requirements for the hydraulic control device are relatively simple. It can be achieved by controlling it with a proportional reversing valve or an electro-hydraulic reversing valve and connecting two transverse hydraulic cylinders in parallel through a hydraulic pipeline. This continuous casting machine turning cooling bed transverse shift drive device has a simple structure and is easy to synchronize. However, since the transverse shift shaft of the cooling bed is relatively long, it will break from the middle welding place after a long time, and the synchronization of the transverse shift of the cooling bed cannot be achieved, which affects the production of billets.

[0007] In the second case, the two transverse hydraulic cylinders of the reversing cooling bed are controlled by two proportional reversing valves respectively. The two transverse hydraulic cylinders are equipped with displacement sensors. The two transverse hydraulic cylinders compare their displacements with each other through displacement sensors during the process of movement, and adjust the displacement through their respective proportional reversing valves to achieve synchronization of the two transverse hydraulic cylinders. The characteristics of this transverse drive device for the reversing cooling bed of the continuous casting machine are high synchronization accuracy, but the electrical control part is complex. During use, it was found that this drive device has some problems: on the one hand, the transverse drive device for the reversing cooling bed of the continuous casting machine has high requirements for synchronization accuracy. Only when the transverse deviation of the reversing cooling bed of the continuous casting machine is within a certain controllable range can it operate normally. However, the reversing cooling bed of the continuous casting machine is a large-scale equipment. When a large transverse deviation occurs during operation due to some reason, this transverse drive device for the reversing cooling bed of the continuous casting machine will stop working. On the other hand, the working environment of the displacement sensors on the two transverse hydraulic cylinders is relatively harsh, and failures often occur, which directly affects the quality and production of billets.

[0008] The third situation is applicable when the load deviation of the two transverse cylinders is not large. When the median length of the produced ingot cannot be on the center line of the step-by-step turning cooling bed, the load on the two transverse cylinders is too large. In severe cases, the piston and piston rod of the transverse cylinder may be stuck. Summary of the invention

[0009] The purpose of the present invention is to provide a hydraulic device for transverse movement of a continuous casting machine turning cooling bed, which uses a functional hydraulic cylinder as a synchronization element, so that the synchronization accuracy of the two transverse movement hydraulic cylinders is high, the synchronization effect is stable and reliable, and the displacement error of the two transverse movement hydraulic cylinders can be eliminated, thereby ensuring the efficient operation of the entire system and solving the problems existing in the background technology.

[0010] The technical solution of the present invention is:

[0011] A hydraulic device for transverse movement of a continuous casting machine turning cooling bed, comprising a proportional valve, a double hydraulically controlled one-way valve, two transverse movement oil cylinders and a functional cylinder;

[0012] The functional cylinder is composed of two hydraulic cylinders, which share a cylinder body and a piston rod. There are two pistons on the piston rod. The two pistons divide the two hydraulic cylinders into four chambers. Each piston is provided with two sets of one-way valve groups. Each one-way valve group is composed of a pair of one-way valves with valve cores protruding outside the end surface of the piston. The two one-way valves are arranged opposite to each other and are connected in the middle.

[0013] One end of the high-pressure pipeline is connected to the hydraulic pump station, the other end of the high-pressure pipeline is connected to the oil inlet of the proportional valve, the return oil pipeline of the proportional valve is connected to the return oil pipeline of the hydraulic pump station, the two oil outlets of the proportional valve are respectively connected to the double hydraulic control one-way valve, one oil outlet of the double hydraulic control one-way valve is connected to the two chambers of the functional cylinder, the other two chambers of the functional cylinder are respectively connected to one chamber of the two transverse hydraulic cylinders, the other chambers of the two transverse hydraulic cylinders are connected to the other oil outlet of the double hydraulic control one-way valve through the pipeline, and two back-to-back one-way valves are arranged on the piston of each transverse oil cylinder.

[0014] The two sets of one-way valve groups on each piston in the functional cylinder are arranged up and down.

[0015] The four chambers of the two hydraulic cylinders in the functional cylinder are respectively the left-left chamber, the left-right chamber, the right-left chamber, and the right-right chamber. The left-right chamber and the right-right chamber are connected to an oil outlet of the double hydraulically controlled one-way valve. The left-left chamber and the right-left chamber are respectively connected to the rodless chambers of the two transverse hydraulic cylinders through pipelines, and the rod chambers of the two transverse hydraulic cylinders are connected to the other oil outlet of the double hydraulically controlled one-way valve through pipelines.

[0016] The two one-way valves on the transverse cylinder piston are arranged in back-to-back relationship, wherein the valve core of the one-way valve facing the rodless chamber protrudes out of the end face of the transverse cylinder piston, and the valve core of the one-way valve facing the rod chamber is on the same plane as the end face of the transverse cylinder piston.

[0017] A high-pressure ball valve and a high-pressure filter are arranged on the high-pressure pipeline between the hydraulic pump station and the proportional valve.

[0018] The beneficial effects of the present invention are as follows: the present invention adopts a functional cylinder as a synchronization element, and a one-way valve is installed on the functional cylinder, which can overcome the influence of the processing accuracy of the transverse hydraulic cylinder, the system sealing, the selected components and the cooling bed overload on the synchronization, so that the synchronization accuracy of the two transverse hydraulic cylinders is high, the synchronization effect is stable and reliable, and it can automatically fill with fluid when used for the first time, and can automatically compensate when leakage occurs, ensuring the efficient operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the hydraulic principle diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the left transverse hydraulic cylinder of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the right transverse hydraulic cylinder of the present invention;

[0022] Figure 4 This is a schematic diagram of the functional cylinder structure of the present invention;

[0023] In the figure: high pressure filter 1, proportional valve 2, double hydraulic control non-return valve 3, left lateral oil cylinder 4, right lateral oil cylinder 5, functional cylinder 6, high pressure ball valve 7, non-return valve 8, left lateral cylinder piston 9, left lateral long protrusion non-return valve 10, left lateral non-return valve 11, right lateral piston 12, right lateral long protrusion non-return valve 13, right lateral non-return valve 14, first long protrusion non-return valve on the upper part of the left piston 15, left piston 16, second long protrusion non-return valve on the upper part of the left piston 17 , the first long protrusion one-way valve 18 on the upper part of the right piston, the right piston 19, the second long protrusion one-way valve 20 on the upper part of the right piston, the first long protrusion one-way valve 21 on the lower part of the left piston, the second long protrusion one-way valve 22 on the lower part of the left piston, the first long protrusion one-way valve 23 on the lower part of the right piston, the second long protrusion one-way valve 24 on the lower part of the right piston, the piston rod 25, the left-left chamber 26, the left-right chamber 27, the right-left chamber 28, the right-right chamber 29, and the cylinder body 30. DETAILED DESCRIPTION

[0024] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0025] See attached Figure 1-4 , a hydraulic device for transverse movement of a continuous casting machine turning cooling bed, comprising a proportional valve 2, a double hydraulically controlled one-way valve 3, two transverse movement cylinders and a functional cylinder 6;

[0026] The functional cylinder 6 is composed of two hydraulic cylinders, which share a cylinder body 30 and a piston rod 25. The piston rod 25 has two pistons, which divide the two hydraulic cylinders into four chambers. Each piston is provided with two sets of one-way valve groups, each of which is composed of a pair of one-way valves with valve cores protruding from the end surface of the piston. The two one-way valves are arranged opposite to each other and are connected in the middle.

[0027] One end of the high-pressure pipeline is connected to the hydraulic pump station, and the other end of the high-pressure pipeline is connected to the oil inlet of the proportional valve 2. The oil return pipeline of the proportional valve 2 is connected to the oil return pipeline of the hydraulic pump station. The two oil outlets of the proportional valve 2 are respectively connected to the double hydraulically controlled one-way valve 3. One oil outlet of the double hydraulically controlled one-way valve 3 is connected to the two chambers of the functional cylinder 6. The other two chambers of the functional cylinder 6 are respectively connected to one chamber of the two transverse hydraulic cylinders. The other chambers of the two transverse hydraulic cylinders are connected to the other oil outlet of the double hydraulically controlled one-way valve 3 through a pipeline. Two back-to-back one-way valves are provided on the piston of each transverse oil cylinder.

[0028] In this embodiment, refer to the attached Figure 1 The high-pressure ball valve 7 and the high-pressure filter 1 are installed on the high-pressure oil inlet pipeline. One end of the high-pressure pipeline is connected to the high-pressure pipeline of the hydraulic pump station, and the other end is connected to the "P" oil inlet of the proportional valve. The "T" oil return pipeline of the proportional valve is connected to the oil return pipeline of the hydraulic pump station through a one-way valve 8. The two oil outlets of the proportional valve are connected to the double hydraulic control one-way valve 3. One oil outlet of the double hydraulic control one-way valve 3 is divided into two oil circuits, which are respectively connected to the left and right chambers 27 and the right right chamber 29 of the two chambers of the functional cylinder 6. The other two chambers of the functional cylinder 6, the left-left chamber 26 and the right-left chamber 28, are respectively connected to the rodless chambers of the left lateral oil cylinder 4 and the right lateral oil cylinder 5 through hydraulic pipelines. The function of the double hydraulic control one-way valve 3 is to make the left lateral oil cylinder 4 and the right lateral oil cylinder 5 self-lock at any position. The function of the one-way valve 8 is to separate the return oil pipeline of the cooling bed lateral hydraulic system from the main return oil pipeline.

[0029] See attached Figure 2 , 3The left lateral shift cylinder 4 and the right lateral shift cylinder 5 are single-acting hydraulic cylinders. Two check valves, a left lateral long protrusion check valve 10 and a left lateral check valve 11, are installed on the left lateral shift cylinder piston 9. The valve core of the left lateral long protrusion check valve 10 protrudes from the end face of the left lateral shift cylinder piston 9, and the valve core of the left lateral check valve 11 is flush with the end face of the left lateral shift cylinder piston 9. The left lateral long protrusion check valve 10 and the left lateral check valve 11 are installed on the left lateral shift cylinder piston 9 facing each other, and there is an oil passage in between. Similarly, two one-way valves, a right horizontal long protrusion one-way valve 13 and a right horizontal one-way valve 14, are installed on the right horizontal shift cylinder piston 12. The valve core of the right horizontal long protrusion one-way valve 13 protrudes from the end face of the right horizontal shift cylinder piston 12, and the valve core of the right horizontal one-way valve 14 is flush with the end face of the right horizontal shift cylinder piston 12. The right horizontal long protrusion one-way valve 13 and the right horizontal one-way valve 14 are installed opposite to each other on the right horizontal shift cylinder piston 12, and there is an oil passage in between.

[0030] See attached Figure 4 The functional cylinder 6 is composed of a cylinder body 30, a piston rod 25, a left piston 16 and a right piston 19. The functional cylinder 6 acts as a synchronization element in the system. The functional cylinder 6 is composed of two hydraulic cylinders. The two hydraulic cylinders share a cylinder body 30 and a piston rod 25. The left piston 16 and the right piston 19 divide the two hydraulic cylinders into four chambers of equal volume, namely, a left-left chamber 26, a left-right chamber 27, a right-left chamber 28 and a right-right chamber 29. The left piston 16 is provided with two groups of one-way valves, one on the upper side and one on the lower side. The one-way valves are the first long protrusion one-way valve 15 on the upper part of the left piston and the second long protrusion one-way valve 17 on the upper part of the left piston. The two one-way valves are installed opposite to each other, with an oil passage in between. The one on the lower side is the first long protrusion one-way valve 21 on the lower part of the left piston and the second long protrusion one-way valve 22 on the lower part of the left piston. The two one-way valves are installed opposite to each other, with an oil passage in between. The right piston 19 is provided with two sets of one-way valves, the upper one-way valve is the first long protrusion one-way valve 18 on the upper part of the right piston, and the second long protrusion one-way valve 20 on the upper part of the right piston. The two one-way valves are installed facing each other, with an oil passage in between. The lower one-way valve is the first long protrusion one-way valve 23 on the lower part of the right piston, and the second long protrusion one-way valve 24 on the lower part of the right piston. The two one-way valves are installed facing each other, with an oil passage in between.

[0031] The working process of the hydraulic device for transverse movement of the turning cooling bed of the present invention is as follows:

[0032] (1) The piston rods of the traverse cylinders 4 and 5 extend outward.

[0033] The high-pressure oil from the high-pressure pipeline of the hydraulic pump station passes through the high-pressure ball valve 7, is filtered by the high-pressure filter and then enters the proportional valve 2. The coaxial cable of the proportional valve 2 makes the right position of the electric proportional valve 2 connected, and the high-pressure oil enters the double hydraulic control one-way valve 3, and the high-pressure oil is output to enter the left and right chambers 27 and the right-right chamber 29 of the functional cylinder 6 respectively, pushing the left piston 16 and the right piston 19 to move to the left respectively. At the same time, the hydraulic oil in the left-left chamber 26 and the right-left chamber 28 enters the rodless chamber of the lateral shift cylinder 4 and the lateral shift cylinder 5, pushing the left lateral shift cylinder piston 9, the right lateral shift piston 12 and each of the lateral shift cylinder 4 and the lateral shift cylinder 5. When the piston rod moves to the right, when the left piston 16 and the right piston 19 of the functional cylinder 6 move to the left and are in place, the valve cores of the first long protrusion one-way valve 15 on the upper part of the left piston and the first long protrusion one-way valve 21 on the lower part of the left piston on the left piston 16 hit the cylinder body 30 and are opened, and the high-pressure oil will push open the valve cores of the second long protrusion one-way valve 17 on the upper part of the left piston and the second long protrusion one-way valve 22 on the lower part of the left piston and enter the left-left chamber 26 from the left and right chambers 27, and then enter the rodless chamber of the transverse cylinder 4, filling and replenishing the hydraulic oil in the rodless chamber of the transverse cylinder 4 to achieve the purpose of calibrating the position. At the same time, the valve cores of the first long protrusion check valve 18 on the upper part of the right piston and the first long protrusion check valve 23 on the lower part of the right piston on the right piston 19 hit the cylinder body 30 and are opened, and the high-pressure oil will push open the second long protrusion check valve 20 on the upper part of the right piston and the second long protrusion check valve 24 on the lower part of the right piston, and the valve cores will enter the left chamber 28 from the left and right chambers 29, and then enter the rodless chamber of the transverse oil cylinder 5, so as to fill and replenish the hydraulic oil in the rodless chamber of the transverse oil cylinder 5 and achieve the purpose of calibrating the position.

[0034] After the left lateral cylinder piston 9 and the right lateral cylinder piston 12 of the left lateral cylinder 4 and the right lateral cylinder 5 move to the right and are in place, the piston rods of the left lateral cylinder 4 and the right lateral cylinder 5 are extended outwards. At the same time, the hydraulic oil in the rod chamber of the left lateral cylinder 4 and the right lateral cylinder 5 enters the proportional valve 2 through the double hydraulic control check valve 3, and flows through the "T" of the proportional valve 2 through the check valve 8 and enters the return oil pipeline of the hydraulic system.

[0035] (2) The piston rods of the left traverse cylinder 4 and the right traverse cylinder 5 are retracted.

[0036] The high-pressure oil from the high-pressure pipeline of the hydraulic pump station passes through the high-pressure ball valve 7, is filtered by the high-pressure filter and then enters the proportional valve 2. The coaxial cable of the proportional valve 2 is energized to connect the left position of the proportional valve 2, and the high-pressure oil enters the double hydraulic control one-way valve 3, and outputs the high-pressure oil into the rod chambers of the left lateral shift cylinder 4 and the right lateral shift cylinder 5, pushing the left lateral shift cylinder piston 9, the right lateral shift piston 12 and their respective piston rods of the left lateral shift cylinder 4 and the right lateral shift cylinder 5 to move to the left. At the same time, the hydraulic oil in the rodless chambers of the left lateral shift cylinder 4 and the right lateral shift cylinder 5 enter the left-left chamber 26 and the right-left chamber 28 of the functional cylinder 6 respectively, pushing the left piston 16 and the right piston 19 of the functional cylinder 6 to move to the right. When the left piston 16 and the right piston When 19 moves to the right and into position, the valve cores of the second long protrusion one-way valve 17 on the upper part of the left piston and the second long protrusion one-way valve 22 on the lower part of the left piston 16 hit the cylinder body 30 and are opened, and the hydraulic oil pushes open the valve cores of the first long protrusion one-way valve 15 on the upper part of the left piston and the first long protrusion one-way valve 21 on the lower part of the left piston, and the hydraulic oil enters the left-left chamber 27 from the left and right chambers 26. At the same time, the valve core of the left transverse long protrusion one-way valve 10 of the left transverse cylinder piston 9 of the left transverse cylinder 4 hits the cylinder body and is opened, and the high-pressure oil pushes open the left transverse one-way valve 11 of the left transverse cylinder piston 9 of the left transverse cylinder 4 and fills and replenishes oil from the rod chamber to the rodless chamber and the left and right chambers 26 of the functional cylinder 6, thereby achieving the purpose of calibrating the position. At the same time, the valve cores of the second long protrusion check valve 20 on the upper part of the right piston of the right piston 19 and the second long protrusion check valve 24 on the lower part of the right piston hit the cylinder body 30 and are opened, and the hydraulic oil pushes open the valve cores of the first long protrusion check valve 18 on the upper part of the right piston and the first long protrusion check valve 23 on the lower part of the right piston, and the hydraulic oil enters the left chamber 29 from the left and right chambers 28. At the same time, the valve core of the right transverse long protrusion check valve 13 of the right transverse cylinder piston 12 of the right transverse oil cylinder 5 hits the cylinder body and is opened, and the high-pressure oil pushes open the right transverse check valve 14 of the left transverse cylinder piston 12 of the right transverse oil cylinder 5, and fills and replenishes oil from the rod chamber to the rodless chamber and the left and right chambers 28 of the functional cylinder 6, so as to achieve the purpose of calibrating the position. The hydraulic oil in the left and right chambers 27 and the right chamber 29 enters the proportional valve 2 through the double hydraulic control check valve 3, and flows through the check valve 8 from the "T" of the proportional valve 2 to enter the return oil pipeline of the hydraulic system. After the left lateral movement cylinder piston 9 and the right lateral movement piston 12 of the left lateral movement cylinder 4 and the right lateral movement cylinder 5 are moved to the left, the retraction process of the piston rods of the left lateral movement cylinder 4 and the right lateral movement cylinder 5 is completed.

[0037] (3) The piston rods of the left lateral cylinder 4 and the right lateral cylinder 5 are self-locking

[0038] The coaxial cable of the proportional valve 2 must not be electrified. The hydraulic system of the turning cooling bed and lateral movement traps the hydraulic oil under the action of the double hydraulically controlled one-way valve 3 and the functional cylinder 6 to achieve system self-locking.

[0039] When the functional cylinder 6 reaches the left limit, the one-way valve core is pushed open, and the system replenishes oil to the middle system through the one-way valve; when the piston rods of the left lateral shift cylinder 4 and the right lateral shift cylinder 5 reach the limit, the one-way valves at the lower ends of the pistons of the left lateral shift cylinder 4 and the right lateral shift cylinder 5 are pushed open, and the system also replenishes oil to the middle system, and oil is replenished twice in each cycle to eliminate the position synchronization error and the cumulative error of the system caused by leakage during the process, and effectively reduce the influence of hydraulic cylinder manufacturing accuracy and sealing on the synchronization accuracy.

Claims

1. A hydraulic device for transverse movement of a continuous casting machine turning cooling bed, characterized in that: It includes a proportional valve (2), a double hydraulically controlled one-way valve (3), two lateral oil cylinders and a functional cylinder (6); The functional cylinder (6) is composed of two hydraulic cylinders, which share a cylinder body (30) and a piston rod (25). The piston rod (25) has two pistons, which divide the two hydraulic cylinders into four chambers. Each piston is provided with two sets of one-way valve groups, each one-way valve group is composed of a pair of one-way valves with valve cores protruding outside the end surface of the piston, and the two one-way valves are arranged opposite to each other and are connected in the middle. One end of the high-pressure pipeline is connected to the hydraulic pump station, the other end of the high-pressure pipeline is connected to the oil inlet of the proportional valve (2), the oil return pipeline of the proportional valve (2) is connected to the oil return pipeline of the hydraulic pump station, the two oil outlets of the proportional valve (2) are respectively connected to the double hydraulic control check valve (3), one oil outlet of the double hydraulic control check valve (3) is connected to the two chambers of the function cylinder (6), the other two chambers of the function cylinder (6) are respectively connected to one chamber of the two transverse hydraulic cylinders, the other chambers of the two transverse hydraulic cylinders are connected to the other oil outlet of the double hydraulic control check valve (3) through the pipeline, and two check valves arranged in reverse are provided on the piston of each transverse hydraulic cylinder.

2. A hydraulic device for transverse movement of a continuous casting machine turning cooling bed according to claim 1, characterized in that: The two sets of one-way valve groups on each piston in the functional cylinder (6) are arranged up and down.

3. A hydraulic device for transverse movement of a continuous casting machine turning cooling bed according to claim 1 or 2, characterized in that: The four chambers of the two hydraulic cylinders in the functional cylinder (6) are respectively a left-left chamber (26), a left-right chamber (27), a right-left chamber (28), and a right-right chamber (29); the left-right chamber (27) and the right-right chamber (29) are connected to an oil outlet of the double hydraulically controlled one-way valve (3); the left-left chamber (26) and the right-left chamber (28) are respectively connected to the rodless chambers of the two transverse hydraulic cylinders through pipelines; and the rod chambers of the two transverse hydraulic cylinders are connected to the other oil outlet of the double hydraulically controlled one-way valve (3) through pipelines.

4. The hydraulic device for transverse movement of a continuous casting machine turning cooling bed according to claim 1, characterized in that: The two one-way valves on the transverse cylinder piston are arranged in back-to-back relationship, wherein the valve core of the one-way valve facing the rodless chamber protrudes out of the end face of the transverse cylinder piston, and the valve core of the one-way valve facing the rod chamber is on the same plane as the end face of the transverse cylinder piston.

5. The hydraulic device for transverse movement of a continuous casting machine turning cooling bed according to claim 1, characterized in that: A high-pressure ball valve (7) and a high-pressure filter (1) are provided on the high-pressure pipeline between the hydraulic pump station and the proportional valve (2).

Images