Synchronous lifting hydraulic system for RH hot bent pipe

Abstract

The utility model discloses a synchronous lifting hydraulic system for an RH hot bent pipe. The synchronous lifting hydraulic system comprises a hydraulic pump station, an executing mechanism with a plurality of sets of hydraulic cylinder assemblies, and a control valve stand on which a synchronous motor, a first electromagnetic reversing valve and a second electromagnetic reversing valve are arranged. The hydraulic pump station is connected with the control valve stand through an oil supply pipeline and an oil return pipeline. The hydraulic cylinder assembly comprises a plunger type hydraulic cylinder and a hydraulic control one-way valve. The hydraulic control one-way valve is connected between the plunger type hydraulic cylinder and the synchronous motor and enables oil to flow to the plunger type hydraulic cylinder from the synchronous motor. And the plunger type hydraulic cylinder is connected with the oil return pipeline through the oil cavity residual liquid loop. The first electromagnetic directional valve is connected with the oil supply pipeline, the synchronous motor and the oil return pipeline; and the second electromagnetic directional valve is connected with a control oil port of the hydraulic control one-way valve, the oil supply pipeline and the oil return pipeline and can reversely open the hydraulic control one-way valve, so that oil can flow to the synchronous motor from the plunger type hydraulic cylinder. Therefore, the purposes of reducing cost and increasing efficiency are achieved through the cooperation of the synchronous motor and the oil cavity residual liquid loop.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic transmission and control, in particular to a RH hot-bending pipe synchronous lifting hydraulic system. Background Art

[0002] RH is a cyclic vacuum degassing method that combines vacuum refining with the circulating flow of molten steel. During the smelting process, only a part of the molten steel is exposed to the vacuum environment at the same time. It has the advantages of short processing cycle, large production capacity, and good refining effect. It is suitable for cooperation with converter steelmaking.

[0003] In the development process of RH, different forms have appeared successively, such as vacuum tank rotation and lifting, vacuum tank fixed lifting ladle and vacuum tank fixed lifting ladle car. At present, the most widely used form is the vacuum tank fixed lifting ladle car, which completes the lifting and lowering of the ladle car and ladle through the ladle car lifting hydraulic cylinder.

[0004] RH's vacuum tank is placed on a vacuum tank truck, which can travel on a steel structure platform in a direction perpendicular to the movement direction of the ladle car to switch between the processing station and the standby station. When in the processing station, the vacuum tank is connected to the vacuum pipeline through a hot bend pipe, and a vacuum pipeline with good airtightness is formed between the vacuum tank, the vacuum pipeline inlet and the hot bend pipe for vacuuming operation.

[0005] Usually, during the RH vacuum treatment process, the ladle car on the ground has been driven to the top of the ladle hydraulic lifting mechanism, and the ladle car (including the ladle transporting molten steel) is lifted by the lifting frame driven by the lifting hydraulic cylinder until the immersion pipe at the bottom of the vacuum tank is inserted into the molten steel to a certain depth. At this time, the entire vacuum exhaust pipeline is closed and the RH vacuum degassing treatment can be started. The operator opens the vacuum pump subsystems at various levels in the order set by the program, gradually evacuates the air in the vacuum tank, and makes the air pressure lower and lower. When a certain vacuum degree is reached, vacuum treatment for different purposes such as degassing or decarburization of molten steel is carried out, and alloys are added for alloy fine-tuning.

[0006] It can be seen that good contact and good sealing between the hot-bent pipe and the vacuum tank and vacuum pipeline play a vital role in the final performance of the system. This requires that the hot-bent pipe should be kept horizontal as much as possible during the lifting process, which means that the several hydraulic cylinders that complete the lifting action must maintain good synchronous movement.

[0007] To achieve the above goals, there are currently two most commonly used technical solutions for hot-bending pipe jacking hydraulic systems. One is the technology introduced from Voestalpine, which specifically involves setting a throttle valve in the forward and return directions of each hydraulic cylinder; the other is the technology introduced from SMS Siemag, which specifically involves using a synchronous motor to control the synchronous movement of the hydraulic cylinder.

[0008] However, the synchronization accuracy of the technical solution introduced from Voestalpine depends on the debugging level of the on-site debugging technicians, and the performance of the throttle valve is easily affected by the oil temperature and viscosity. There are generally problems such as difficult synchronization adjustment and low synchronization. The synchronous motor used in the technical solution introduced from SMS has certain operating errors in use due to its own manufacturing and installation errors. In the repeated operation process, the errors that cannot be eliminated will accumulate and become larger and larger, resulting in larger and larger errors in the starting and stopping positions of each hydraulic cylinder. If they are not eliminated, the synchronization accuracy of the hydraulic cylinder will be seriously affected, and then the fit between the flange surface and the sealing ring will be affected.

[0009] As an improvement, the prior art provides a solution for using hydraulic proportional valve control to achieve synchronous movement of multiple hydraulic cylinders. However, this solution places high demands on the cleanliness of the system oil. Ordinary hydraulic systems generally require NASA-7 level accuracy, but proportional systems generally require NASA-6 level accuracy or even higher. In addition, hydraulic proportional valves have the problems of high price, long delivery cycle, and high maintenance cost. However, during the lifting process of the hot-bending pipe, as long as the general synchronization is ensured, the sealing ring on the vacuum tank and the hot-bending pipe connecting flange can be pressed, and because of the vacuum negative pressure characteristics during the exhaust process, the sealing will become better and better, which can fully meet the production process requirements. Therefore, from an economic point of view, the pursuit of high-precision lifting and lowering synchronous control is not the optimal solution in the lifting and lowering control of RH hot-bending pipes. Utility Model Content

[0010] The utility model aims to provide a RH hot-bending pipe synchronous lifting hydraulic system to solve the problem that the prior art cannot take into account high synchronization accuracy, low investment, short cycle and low use cost.

[0011] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0012] The utility model provides a RH hot-bending pipe synchronous lifting hydraulic system, comprising a hydraulic pump station, an actuator with multiple sets of hydraulic cylinder components, and a control valve station on which a synchronous motor, a first electromagnetic reversing valve and a second electromagnetic reversing valve are arranged;

[0013] The hydraulic pump station is connected to the control valve station through an oil supply pipeline and an oil return pipeline;

[0014] The hydraulic cylinder assembly includes a plunger hydraulic cylinder and a hydraulically controlled one-way valve; the hydraulically controlled one-way valve is connected between the plunger hydraulic cylinder and the synchronous motor, and can allow oil to flow from the synchronous motor to the plunger hydraulic cylinder; the plunger hydraulic cylinder is connected to the oil return pipeline through an oil chamber residual liquid circuit, and the oil chamber residual liquid circuit is used to empty the residual medium in the oil chamber of the plunger hydraulic cylinder;

[0015] The first electromagnetic reversing valve is connected to the oil supply pipeline, the synchronous motor and the oil return pipeline, and the first electromagnetic reversing valve can make the oil flow from the oil supply pipeline to the synchronous motor, or the first electromagnetic reversing valve can make the oil flow from the synchronous motor to the oil return pipeline;

[0016] The second electromagnetic reversing valve is connected to the control oil port of the hydraulically controlled one-way valve, the oil supply pipeline and the oil return pipeline. The second electromagnetic reversing valve can reversely open the hydraulically controlled one-way valve to allow oil to flow from the plunger hydraulic cylinder to the synchronous motor.

[0017] In a specific embodiment, a first switch valve is provided on the residual liquid circuit of the oil chamber.

[0018] In a specific embodiment, the first solenoid reversing valve is a three-position four-way solenoid reversing valve, the first solenoid reversing valve having a first pressure oil port, a first oil return port, a first working oil port and a second working oil port, the first pressure oil port is connected to the oil supply pipeline through a first pipeline, the first oil return port is connected to the oil return pipeline through a second pipeline, the first working oil port is connected to the synchronous motor through a third pipeline, and the second working oil port is a closed port.

[0019] In a specific embodiment, the second solenoid reversing valve is a two-position four-way solenoid reversing valve, the second solenoid reversing valve has a second pressure oil port, a second return oil port, a third working oil port and a fourth working oil port, the second pressure oil port is connected to the oil supply pipeline through a fourth pipeline, the second return oil port is connected to the return oil pipeline through a fifth pipeline, the third working oil port is a closed port, and the fourth working oil port is connected to the control oil port of the hydraulically controlled one-way valve through a sixth pipeline.

[0020] In a specific embodiment, a first one-way valve is provided on the second pipeline; and a second one-way valve is provided on the fifth pipeline.

[0021] In a specific embodiment, a one-way throttle valve is provided on the third pipeline.

[0022] In a specific embodiment, the hydraulically controlled one-way valve is connected to the synchronous motor via a seventh pipeline, and a second switch valve is provided on the seventh pipeline.

[0023] In a specific embodiment, a main pressure measuring joint is connected on the oil supply pipeline and near the hydraulic pump station, a first pressure measuring joint is connected on the third pipeline and located between the first solenoid reversing valve and the one-way throttle valve, a second pressure measuring joint is connected on the sixth pipeline and located between the branch connecting pipeline of the hydraulically controlled one-way valve and the second solenoid reversing valve, and a third pressure measuring joint is connected on the seventh pipeline and located between the second switch valve and the synchronous motor.

[0024] In a specific embodiment, a main switch valve is provided on the oil supply pipeline and between the hydraulic pump station and the main pressure measuring joint, a third switch valve is provided on the first pipeline and between the fourth pipeline and the oil supply pipeline, and a fourth switch valve is provided on the sixth pipeline and between the second solenoid reversing valve and the second pressure measuring joint.

[0025] In a specific embodiment, the oil supply pipeline is connected to the oil return pipeline through an eighth pipeline, and a fifth switch valve is provided on the eighth pipeline.

[0026] In a specific embodiment, a third one-way valve is provided on the oil return pipeline and at a position close to the hydraulic pump station.

[0027] Preferably, the first switch valve, the first one-way valve, the second one-way valve, the one-way throttle valve, the second switch valve, the main pressure measuring joint, the first pressure measuring joint, the third pressure measuring joint, the main switch valve, the third switch valve, the fourth switch valve, the fifth switch valve, and the third one-way valve are all located on the control valve platform.

[0028] In a specific embodiment, a valve block is provided on the plunger-type hydraulic cylinder, and the hydraulically controlled one-way valve is arranged in the valve block.

[0029] The characteristics and advantages of this utility model are:

[0030] 1. The RH hot-bending pipe synchronous lifting hydraulic system provided by the utility model controls the synchronous movement of multiple plunger hydraulic cylinders by setting a synchronous motor, and relies on the accuracy of the synchronous motor to ensure the synchronous accuracy of the lifting and lowering movements of multiple plunger hydraulic cylinders; at the same time, the accumulated error in the operation of the synchronous motor is eliminated by setting the residual liquid circuit in the oil chamber, so that each plunger hydraulic cylinder returns to the initial zero position, thereby ensuring that the system meets the production process requirements for a long time.

[0031] 2. The RH hot-bending pipe synchronous lifting hydraulic system provided by the utility model significantly improves the sealing accuracy between the hot-bending pipe and the vacuum pipeline and the vacuum tank through the coordinated setting of the synchronous motor and the residual liquid circuit in the oil chamber, and greatly shortens the adjustment time. At the same time, the improvement of the sealing accuracy can effectively alleviate the amount of gas entering the vacuum pipeline from the atmosphere during RH vacuum refining, thereby greatly reducing the system energy consumption during RH vacuum extraction and shortening the RH vacuum processing time; in addition, since the requirements for synchronization accuracy are reduced while meeting the production process, the costs of initial investment and subsequent maintenance are greatly reduced, and both from the perspective of production and from the perspective of equipment use and maintenance, it has obvious cost-reduction and efficiency-increasing effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of 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 creative work.

[0033] Figure 1 It is a composition diagram of the RH hot-bending pipe synchronous lifting hydraulic system provided in the embodiment of the utility model;

[0034] Figure 2 for Figure 1 A partial enlarged view of M;

[0035] Figure 3 for Figure 1 A partial enlarged view of N.

[0036] Description of Figure Numbers:

[0037] 100. Hydraulic pump station;

[0038] 200, hydraulic cylinder assembly; 201, plunger hydraulic cylinder; 202, hydraulically controlled one-way valve; 203, valve block;

[0039] 300, control valve station; 301, synchronous motor; 302, first electromagnetic reversing valve; 303, second electromagnetic reversing valve; 304, electrical junction box;

[0040] 400, oil supply pipeline; 401, main pressure measuring joint; 402, main switch valve;

[0041] 500, oil return pipeline; 501, third one-way valve;

[0042] 600, branch connection pipeline;

[0043] 1. Residual liquid circuit of oil chamber; 11. First switch valve; 12. First damping hole;

[0044] 2. First pipeline; 21. Third switch valve;

[0045] 3. Second pipeline; 31. First one-way valve;

[0046] 4. The third pipeline; 41. A one-way throttle valve; 42. The first pressure measuring joint;

[0047] 5. Fourth pipeline; 51. Second damping hole;

[0048] 6. Fifth pipeline; 61. Second one-way valve;

[0049] 7. Sixth pipeline; 71. Second pressure measuring joint; 72. Fourth switch valve;

[0050] 8. Seventh pipeline; 81. Second switch valve; 82. Third pressure measuring joint;

[0051] 9. The eighth pipeline; 91. The fifth switch valve;

[0052] A, oil inlet; B, oil outlet; X, control oil port;

[0053] P1, first pressure oil port; T1, first return oil port; A1, first working oil port; B1, second working oil port;

[0054] P2, second pressure oil port; T2, second return oil port; A2, third working oil port; B2, fourth working oil port. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0056] like Figures 1 to 3 As shown, the utility model provides a RH hot-bending pipe synchronous lifting hydraulic system, comprising a hydraulic pump station 100, an actuator having a plurality of hydraulic cylinder assemblies 200, and a control valve station 300 on which a synchronous motor 301, a first electromagnetic reversing valve 302, and a second electromagnetic reversing valve 303 are arranged. The hydraulic pump station 100 is connected to the control valve station 300 through an oil supply pipeline 400 and an oil return pipeline 500. The hydraulic cylinder assembly 200 comprises a plunger hydraulic cylinder 201 and a hydraulically controlled one-way valve 202; the hydraulically controlled one-way valve 202 is connected between the plunger hydraulic cylinder 201 and the synchronous motor 301, and can allow the oil to flow from the synchronous motor 301 to the plunger hydraulic cylinder 201. The plunger hydraulic cylinder 201 is connected to the oil return pipeline 500 through an oil chamber residual liquid circuit 1, and the oil chamber residual liquid circuit is used to empty the residual medium in the oil chamber of the plunger hydraulic cylinder. Specifically, when the cumulative error during the operation of the synchronous motor 301 exceeds the staff's recognition standard, the residual medium in the oil chamber of each plunger hydraulic cylinder 201 can flow to the oil return pipeline 500 by connecting the oil chamber residual liquid circuit 1 with the oil return pipeline 500, thereby returning each plunger hydraulic cylinder 201 to the initial zero position. In this way, the initial position error of each plunger hydraulic cylinder 201 caused by the cumulative error during the operation of the synchronous motor 301 can be eliminated.

[0057] like Figures 1 to 3As shown, the first electromagnetic reversing valve 302 is connected to the oil supply pipeline 400, the synchronous motor 301 and the oil return pipeline 500. The first electromagnetic reversing valve 302 can make the oil flow from the oil supply pipeline 400 to the synchronous motor 301, or the first electromagnetic reversing valve 302 can make the oil flow from the synchronous motor 301 to the oil return pipeline 500. The second electromagnetic reversing valve 303 is connected to the control oil port X of the hydraulic control check valve 202, the oil supply pipeline 400 and the oil return pipeline 500. The second electromagnetic reversing valve 303 can reversely open the hydraulic control check valve 202 so that the oil can flow from the plunger hydraulic cylinder 201 to the synchronous motor 301.

[0058] The structures of the hydraulic cylinder assemblies 200 are exactly the same, and the specific number of sets can be determined according to actual needs. The number of outlets of the synchronous motor 301 is consistent with the number of hydraulic cylinder assemblies 200, so as to evenly divide the oil inlet into multiple outlets, so that each outlet flows to each hydraulic cylinder assembly 200, thereby realizing the synchronous control of multiple hydraulic cylinder assemblies 200. Generally, three or four sets are used, and correspondingly, the synchronous motor 301 adopts a triple or quadruple synchronous motor 301. In this embodiment, Figure 1 As shown, a total of four sets of hydraulic cylinder assemblies 200 are provided, and correspondingly, a four-way synchronous motor 301 connected to the four sets of hydraulic cylinder assemblies 200 is provided, that is, the four outlets of the four-way synchronous motor 301 are correspondingly connected to the four sets of hydraulic cylinder assemblies 200, and the four-way synchronous motor 301 can evenly divide the oil entering therein from the oil supply pipeline 400 into four oil outlets, wherein the four-way synchronous motor 301 is a gear type, and its synchronization accuracy is not greater than ±1.5%. The hydraulically controlled one-way valve 202 is a valve component that relies on control oil to enable reverse flow of the one-way valve; the oil outlet B of the hydraulically controlled one-way valve 202 is connected to the oil chamber of the plunger hydraulic cylinder 201. When there is no control oil input to the control oil port X of the hydraulically controlled one-way valve 202, the pressure oil can only flow from the oil inlet A of the hydraulically controlled one-way valve 202 to the oil outlet B, and cannot flow in the reverse direction. At this time, the four-way oil output can enter the oil chambers of the four plunger hydraulic cylinders 201 through the hydraulically controlled one-way valves 202 of the four sets of hydraulic cylinder assemblies 200, respectively, to push the cylinder rods of the plunger hydraulic cylinders 201 to extend, and the four plunger hydraulic cylinders 201 act synchronously to drive the hot bend pipe to rise, stopping the supply of After the pressure oil is released, the hydraulically controlled one-way valve 202 is locked, and the hot-bending pipe lifted by the plunger hydraulic cylinder 201 will stay in a certain position and will not slide down, so as to ensure the safety when replacing the hot-bending pipe or the vacuum tank; when the control oil port X of the hydraulically controlled one-way valve 202 has control oil input, the hydraulically controlled one-way valve 202 will be forcibly opened, and its oil inlet A and oil outlet B are connected. At this time, a return oil passage is formed between the oil chamber of the plunger hydraulic cylinder 201 and the synchronous motor 301, and the plunger hydraulic cylinder 201 returns oil under the deadweight pressure of the hot-bending pipe, and the cylinder rod of the plunger hydraulic cylinder 201 retracts, and the four plunger hydraulic cylinders 201 act synchronously to drive the hot-bending pipe to descend.

[0059] The hydraulic pump station 100 includes an oil tank and its accessories, a set of circulating pump groups, and a set of high-pressure pump groups. The oil tank and its accessories and a set of circulating pump groups are used to provide the high-pressure pump group with hydraulic oil that meets the temperature requirements, cleanliness requirements, and flow requirements; the high-pressure pump group is composed of several sets of high-pressure pumps and motors and corresponding accessories that match the system working requirements, and the high-pressure pump group is used to provide pressure oil that meets the system working requirements. The hydraulic pump station 100 provides the control valve station 300 with pressure oil for work through the oil supply pipeline 400, and returns the hydraulic oil that has changed from high pressure to low pressure after pushing the plunger hydraulic cylinder 201 to work to the oil tank through the return oil pipeline 500.

[0060] According to one embodiment of the present utility model, Figure 1 As shown, a first switch valve 11 is provided on the oil chamber residual liquid circuit 1. By providing the first switch valve 11, the on-off control of the oil chamber residual liquid circuit 1 is realized. When the cumulative error during the operation of the synchronous motor 301 meets the identification standard of the staff, the oil chamber residual liquid circuit 1 is cut off by the first switch valve 11; when the cumulative error during the operation of the synchronous motor 301 exceeds the identification standard of the staff, the first switch valve 11 is opened to connect the oil chamber residual liquid circuit 1, so that the residual oil in the oil chamber of each plunger hydraulic cylinder 201 flows to the return oil pipeline 500 and finally returns to the oil tank, thereby returning each plunger hydraulic cylinder 201 to the initial zero position, and eliminating the initial position error of each plunger hydraulic cylinder 201. In this embodiment, the first switch valve 11 is preferably a ball valve, which has the characteristics of simple structure, durability, and almost no increase in investment. Of course, the first switch valve 11 can also use a solenoid valve, and the on-off of the oil chamber residual liquid circuit 1 is controlled by the power gain and loss of the solenoid valve.

[0061] Further, such as Figure 1 As shown, a first damping hole 12 is provided on the oil chamber residual liquid circuit 1 between the first switch valve 11 and the plunger hydraulic cylinder 201 to reduce flow impact and ensure a stable flow when the oil chamber residual liquid circuit 1 is connected and starts to flow oil.

[0062] According to one embodiment of the present utility model, Figure 1 and Figure 2 As shown, the first solenoid reversing valve 302 is a three-position four-way solenoid reversing valve, and the first solenoid reversing valve 302 has a first pressure oil port P1, a first return oil port T1, a first working oil port A1 and a second working oil port B1. The first pressure oil port P1 is connected to the oil supply pipeline 400 through the first pipeline 2, the first return oil port T1 is connected to the return oil pipeline 500 through the second pipeline 3, the first working oil port A1 is connected to the synchronous motor 301 through the third pipeline 4, and the second working oil port B1 is a closed port.

[0063] According to one embodiment of the present utility model, Figure 1 and Figure 2As shown, the second electromagnetic reversing valve 303 is a two-position four-way electromagnetic reversing valve, and the second electromagnetic reversing valve 303 has a second pressure oil port P2, a second return oil port T2, a third working oil port A2 and a fourth working oil port B2. The second pressure oil port P2 is connected to the oil supply pipeline 400 through the fourth pipeline 5, the second return oil port T2 is connected to the return oil pipeline 500 through the fifth pipeline 6, the third working oil port A2 is a closed port, and the fourth working oil port B2 is connected to the control oil port X of the hydraulically controlled one-way valve 202 through the sixth pipeline 7. Specifically, as Figure 1 and Figure 3 As shown, the control oil port X of each hydraulically controlled one-way valve 202 is connected to the sixth pipeline 7 through its own branch connecting pipeline 600. In this embodiment, the second electromagnetic reversing valve 303 can also be a two-position three-way electromagnetic reversing valve. Figure 1 and Figure 2 As shown, a second damping hole 51 is provided on the fourth pipeline 5. The second damping hole 51 is provided to reduce the pressure impact of the pressure oil entering the second electromagnetic reversing valve 303 and the hydraulically controlled one-way valve 202 in sequence, so that the oil inlet A of the hydraulically controlled one-way valve 202 can be opened smoothly.

[0064] Specifically, by controlling the power gain and loss conditions of the electromagnets a and b at both ends of the first electromagnetic reversing valve 302, the left position or the right position of the first electromagnetic reversing valve 302 is selected to be put into operation, and with the cooperation of the power gain and loss conditions of the electromagnet a of the second electromagnetic reversing valve 303, the synchronous lifting and lowering movement of the plunger hydraulic cylinder 201 is controlled.

[0065] When the electromagnet b of the first electromagnetic reversing valve 302 is energized, the right position of the first electromagnetic reversing valve 302 is put into operation, the first pressure oil port P1 is connected to the first working oil port A1, and the pressure oil in the oil supply pipeline 400 flows into the synchronous motor 301 through the first electromagnetic reversing valve 302. After the pressure oil flows out of the synchronous motor 301, it enters the oil chamber of the plunger hydraulic cylinder 201 through the hydraulic control one-way valve 202, pushing the cylinder rod of the plunger hydraulic cylinder 201 to extend, thereby driving the hot bending pipe to rise; in this process, the electromagnet a of the second electromagnetic reversing valve 303 loses power, and the pressure oil in the right position of the second electromagnetic reversing valve 303 is turned off. Under the action of spring force, the right position of the second electromagnetic reversing valve 303 is put into operation, and the fourth working oil port B2 is connected to the second return oil port T2. At this time, the control oil port X of the hydraulically controlled one-way valve 202 is connected to the return oil, and the second pressure oil port P2 is cut off. The hydraulically controlled one-way valve 202 cannot be opened by the low-pressure return oil. The oil in the oil chamber of the plunger hydraulic cylinder 201 can only remain in place, or the pressure oil from the hydraulic pump station 100 continues to enter the oil chamber of the plunger hydraulic cylinder 201, pushing the cylinder rod of the plunger hydraulic cylinder 201 to continue to extend, driving the hot-bent pipe to continue to rise.

[0066] When the electromagnet a of the second electromagnetic reversing valve 303 is energized, the left position of the second electromagnetic reversing valve 303 is put into operation, the second pressure oil port P2 is connected to the fourth working oil port B2, and the pressure oil enters the control oil port X of the hydraulic control check valve 202 through the second electromagnetic reversing valve 303, forcing the hydraulic control check valve 202 to open, so that a return oil passage is formed between the oil chamber of the plunger hydraulic cylinder 201 and the synchronous motor 301. At this time, the electromagnet a of the first electromagnetic reversing valve 302 is energized, and the first electromagnetic reversing valve The left position of 302 is put into operation, the first working oil port A1 is connected to the first return oil port T1, and a passage is formed between the oil chamber of the plunger hydraulic cylinder 201 and the oil tank of the hydraulic pump station 100. Under the action of the deadweight of the hot-bending pipe, the cylinder rod of the plunger hydraulic cylinder 201 is pushed back, thereby driving the hot-bending pipe to descend. The oil in the oil chamber of the plunger hydraulic cylinder 201 flows to the return oil pipeline 500 through the hydraulically controlled one-way valve 202, the synchronous motor 301, and the first electromagnetic reversing valve 302 in turn and finally returns to the oil tank.

[0067] According to one embodiment of the present utility model, Figure 1 As shown, the hydraulically controlled one-way valve 202 is connected to the synchronous motor 301 through the seventh pipeline 8, and the seventh pipeline 8 is provided with a second switch valve 81. In this way, the second switch valve 81 is provided to manually cut off the pressure oil passage entering the hydraulic cylinder assembly 200 during maintenance or accidents, thereby preventing oil leakage and external dust from entering the system, and providing safety protection.

[0068] According to one embodiment of the present utility model, Figure 1 and Figure 2 As shown, the second pipeline 3 is provided with a first check valve 31; the fifth pipeline 6 is provided with a second check valve 61. In this way, by providing the first check valve 31, when the return oil pressure is high, the oil is prevented from flowing back to the first electromagnetic reversing valve 302 through the second pipeline 3, and the pressure fluctuation and impact on the main return oil line are cut off; by providing the second check valve 61, when the return oil pressure is high, the oil is prevented from flowing back to the second electromagnetic reversing valve 303 through the fifth pipeline 6, and the pressure fluctuation and impact on the main return oil line are cut off.

[0069] According to one embodiment of the present utility model, Figure 1 and Figure 2As shown, a one-way throttle valve 41 is provided on the third pipeline 4. The one-way throttle valve 41 is a prior art, and is a combination valve formed by connecting a one-way valve and a throttle valve in parallel. When the hot bent pipe needs to be lifted, the pressure oil in the third pipeline 4 enters the one-way valve of the one-way throttle valve 41, and then enters the oil chamber of the plunger hydraulic cylinder 201 through the synchronous motor 301 and the hydraulically controlled one-way valve 202; at this time, the one-way throttle valve 41 does not produce a throttling effect on the pressure oil, so as to ensure that the pressure oil flows to the oil chamber of the plunger hydraulic cylinder 201 more quickly, thereby realizing the rapid lifting of the hot bent pipe; when the hot bent pipe needs to be lowered, the electromagnet a of the second solenoid valve is energized and actuated, and after the hydraulically controlled one-way valve 202 is forcibly opened, the oil in the oil chamber of the plunger hydraulic cylinder 201 enters the third pipeline 4 from the seventh pipeline 8 through the synchronous motor 301, and the oil in the third pipeline 4 enters the throttle valve of the one-way throttle valve 41, and then flows to the return oil pipeline 500 through the first electromagnetic reversing valve 302 and the first one-way valve 31.

[0070] According to one embodiment of the present utility model, Figure 1 As shown, in order to facilitate troubleshooting, a total pressure measuring joint 401 is connected on the oil supply pipeline 400 and at a position close to the hydraulic pump station 100 to provide a pressure measuring point of the pressure oil output from the hydraulic pump station 100; a first pressure measuring joint 42 is connected on the third pipeline 4 and located between the first electromagnetic reversing valve 302 and the one-way throttle valve 41 to provide a pressure measuring point between the first electromagnetic reversing valve 302 and the one-way throttle valve 41; a second pressure measuring joint 71 is connected on the sixth pipeline 7 and located between the branch connecting pipeline 600 of the hydraulic control one-way valve 202 and the second electromagnetic reversing valve 303 to provide an incoming oil pressure measuring point entering the control oil port X of the hydraulic control one-way valve 202 through each branch connecting pipeline 600; a third pressure measuring joint 82 is connected on the seventh pipeline 8 and located between the second switch valve 81 and the synchronous motor 301 to provide a pressure measuring point of the pressure oil entering each plunger hydraulic cylinder 201 from each outlet of the synchronous motor 301. Specifically, when it is necessary to detect the working pressure at each point during the troubleshooting process, the threaded cover on the corresponding pressure measuring joint can be opened, and then the corresponding pressure measuring instrument can be installed on the pressure measuring joint to achieve pressure measurement.

[0071] According to one embodiment of the present utility model, Figure 1As shown, in order to improve the safety of the system, a main switch valve 402 is provided on the oil supply pipeline 400 and between the hydraulic pump station 100 and the main pressure measuring joint 401, a third switch valve 21 is provided on the first pipeline 2 and between the fourth pipeline 5 and the oil supply pipeline 400, and a fourth switch valve 72 is provided on the sixth pipeline 7 and between the second electromagnetic reversing valve 303 and the second pressure measuring joint 71. Specifically, each switch valve preferably adopts a high-pressure ball valve, and other types of switch valves can also be used as needed. The main switch valve 402 is used to manually cut off the pressure oil passage entering the control valve station 300 during maintenance or accidents; the third switch valve 21 and the fourth switch valve 72 are used to manually cut off the corresponding pressure oil passages during maintenance or accidents to prevent oil leakage and external dust from entering the system.

[0072] According to one embodiment of the present utility model, Figure 1 As shown, the oil supply pipeline 400 is connected to the oil return pipeline 500 through the eighth pipeline 9, and the eighth pipeline 9 is provided with a fifth switch valve 91. Specifically, the fifth switch valve 91 is used to manually open the valve during system maintenance to allow the oil supply pipeline 400 and the oil return pipeline 500 to be directly connected, so that all the pressure oil returns to the oil tank, thereby depressurizing the entire control valve station 300, providing safety protection for maintenance operations.

[0073] According to one embodiment of the present utility model, Figure 1 As shown, a third one-way valve 501 is provided on the oil return line 500 and near the hydraulic pump station 100. Thus, the third one-way valve 501 is provided to prevent the oil from flowing back from the oil tank of the hydraulic pump station 100 to the control valve station 300.

[0074] Preferably, to facilitate wiring and piping, the first switch valve 11, the first one-way valve 31, the second one-way valve 61, the one-way throttle valve 41, the second switch valve 81, the main pressure measuring joint 401, the first pressure measuring joint 42, the third pressure measuring joint 82, the main switch valve 402, the third switch valve 21, the fourth switch valve 72, the fifth switch valve 91, and the third one-way valve 501 are all located on the control valve platform.

[0075] The RH hot-bending pipe synchronous lifting hydraulic system also includes an electrical junction box 304 (also called a terminal box) disposed on the control valve station 300. When in use, the RH hot-bending pipe synchronous lifting hydraulic system will be equipped with a corresponding controller. The electrical junction box 304 brings together the interfaces of all electrical circuits of the control valve station 300 and is also the electrical path of the controller control signal. The electrical junction box 304, the hydraulic pump station 100 and each switch valve are all electrically connected to the above-mentioned controller.

[0076] According to one embodiment of the present utility model, Figure 1 and Figure 3As shown, for ease of assembly, a valve block 203 is provided on the plunger hydraulic cylinder 201, and a hydraulically controlled one-way valve 202 is disposed in the valve block 203. The valve block 203 is a block with holes, which is convenient for the connection and fixation between the plunger hydraulic cylinder 201 and the hydraulically controlled one-way valve 202, and for the connection between the residual liquid circuit 1 in the oil chamber and the oil chamber of the plunger hydraulic cylinder 201, and takes up less space. As required, the hydraulically controlled one-way valve 202 can also be fixedly connected to the plunger hydraulic cylinder 201 in other ways, and the utility model does not limit this.

[0077] Furthermore, the working process of the RH hot-bending pipe synchronous lifting hydraulic system in this embodiment is as follows:

[0078] The system is put into use when the vacuum tank or the hot bend pipe needs to be replaced.

[0079] First, the hydraulic pump station 100 is started to provide a power source for the control valve station 300 and the plunger hydraulic cylinder 201 .

[0080] After everything is ready, the operator issues a command in the main control room, and the controller gives an electrical signal to the first solenoid reversing valve 302 and the second solenoid reversing valve 303. Then the two solenoid reversing valves cooperate to determine whether the plunger hydraulic cylinder 201 moves upward or downward according to the opening direction of the internal valve port of the first solenoid reversing valve 302 and the opening direction of the internal valve port of the second solenoid reversing valve 303. The rising speed is determined by the hydraulic oil source and the maximum flow rate of the first solenoid reversing valve 302, and the descending speed is determined by the dead weight of the hot-bent pipe and the throttle valve opening size of the one-way throttle valve 41.

[0081] When it is necessary to lift the hot-bent pipe, the controller selects the required electromagnet according to the established program and turns on the current, which is transmitted to the electromagnet b of the first electromagnetic reversing valve 302 through the electrical junction box 304. At this time, the right position of the first electromagnetic reversing valve 302 works. At this time, the electromagnet a of the second electromagnetic reversing valve 303 is in a power-off state, the fourth working oil port B2 and the second return oil port T2 are connected, the control oil port X of the hydraulically controlled one-way valve 202 is connected to the return oil, and the hydraulically controlled one-way valve 202 cannot be opened in reverse. The pressure oil flows through the main switch valve 402 and the third switch valve 21 in sequence, and enters the first electromagnetic reversing valve 302 through the first pressure oil port P1, then flows out of the first electromagnetic reversing valve 302 from the first working oil port A1, and then enters the synchronous motor 301 through the one-way valve of the one-way throttle valve 41. After leaving the synchronous motor 301, the pressure oil is divided into four paths. The oil in each path passes through the second switch valve 81, the hydraulic one-way valve 202, and the valve block 203 in sequence to enter the oil chamber of the plunger hydraulic cylinder 201, pushing the cylinder rod of the plunger hydraulic cylinder 201 to extend, and the four plunger hydraulic cylinders 201 act at the same time to drive the hot bend pipe to rise. In this process, the synchronous motor 301 divides the oil in one path into four paths and respectively enters the four plunger hydraulic cylinders 201 to ensure the synchronous rise of the four plunger hydraulic cylinders 201. Among them, the accuracy of oil distribution is guaranteed by the structure and manufacturing accuracy of the synchronous motor 301.

[0082] When it is necessary to lower the hot bend pipe for vacuum pipe sealing, the controller selects the required electromagnet according to the established procedure and turns on the current. The electromagnet a of the second electromagnetic reversing valve 303 is energized through the electrical junction box 304 to make it work in the left position. The second pressure oil port P2 is connected to the fourth working oil port B2, and the pressure oil enters the control oil port X of the hydraulically controlled one-way valve 202 on the valve block 203 through the third switch valve 21, the second damping hole 51, the second electromagnetic reversing valve 303, and the fourth switch valve 72 in sequence, and the hydraulically controlled one-way valve 202 is forced to open, so that a return oil passage is formed between the oil chamber of the plunger hydraulic cylinder 201 and the first electromagnetic reversing valve 302.

[0083] Afterwards, the controller energizes the electromagnet a of the first electromagnetic reversing valve 302 through the electrical junction box 304. At this time, the left position of the first electromagnetic reversing valve 302 works, the first working oil port A1 is connected to the first oil return port T1, and the oil chamber of the plunger hydraulic cylinder 201 forms a passage to the oil tank of the hydraulic pump station 100. Under the action of the deadweight of the hot bending pipe, the cylinder rod of the plunger hydraulic cylinder 201 is pushed back, and the oil in the oil chamber passes through the hydraulic control check valve 202 on the valve block 203 and returns to the synchronous motor 301 of the control valve station 300. The branch oil is combined through the synchronous motor 301, and then returns to the oil tank through the throttle valve of the one-way throttle valve 41, the first electromagnetic reversing valve 302, the first check valve 31, and the third check valve 501 in sequence. The four plunger hydraulic cylinders 201 act simultaneously to drive the hot bending pipe to descend, wherein the descending speed can be adjusted by adjusting the throttle valve opening size of the one-way throttle valve 41. During this process, the synchronous motor 301 allows the four return oils to enter the branch inlets of the synchronous motor 301 at the same flow rate, and then merge into one path to flow back to the oil tank, so as to ensure the synchronous return oil and descent of the four plunger hydraulic cylinders 201.

[0084] When the hot-bent pipe needs to be stopped at a high position, the controller stops outputting all control signals, and the hydraulically controlled one-way valve 202 is locked to ensure that the hot-bent pipe does not slide down due to its own weight and leakage inside the control valve station 300.

[0085] It can be seen that the second solenoid reversing valve 303, the second damping hole 51, the fourth switch valve 72 and the second one-way valve 61 constitute the hydraulically controlled one-way valve 202 reverse opening control valve group; the first solenoid reversing valve 302, the synchronous motor 301, the one-way throttle valve 41, the second switch valve 81, the third switch valve 21 and the first one-way valve 31 constitute the plunger hydraulic cylinder 201 lifting and lowering motion control valve group.

[0086] During normal lifting operation, the first switch valve 11 on each oil chamber residual liquid circuit 1 connected to each set of hydraulic cylinder assemblies 200 is in a closed state. At this time, the passage from the oil chamber of the plunger hydraulic cylinder 201 back to the oil tank through the first damping hole 12 and the first switch valve 11 is closed. Once the cumulative error of the synchronous motor 301 exceeds the recognition standard of the operator, it is necessary to manually open the first switch valve 11 to eliminate the synchronous position error.

[0087] Specifically, when the plunger hydraulic cylinder 201 drops to the lowest position under the control of the synchronous motor 301, the system shuts down. To ensure safety, the fifth switch valve 91 is opened to connect the oil supply line 400 and the oil return line 500 directly, so that all the pressure oil returns to the oil tank, the entire control valve station 300 is depressurized, and then the fifth switch valve 91 is closed. After that, the first switch valves 11 on the residual liquid circuits 1 of each oil chamber are opened in turn, so that the residual medium in the oil chamber of each plunger hydraulic cylinder 201 returns to the oil tank in turn, so that each plunger hydraulic cylinder 201 returns to the initial zero position in turn, so that all initial position errors caused by the accumulated errors will be completely eliminated. After the errors are eliminated, the first switch valves 11 on the residual liquid circuits 1 of each oil chamber are closed in turn, and the system returns to the initial state, preparing for the normal synchronous lifting movement in the future.

[0088] The RH hot-bending pipe synchronous lifting hydraulic system provided by the utility model controls the synchronous movement of multiple plunger hydraulic cylinders 201 by setting a synchronous motor 301, and relies on the accuracy of the synchronous motor 301 to ensure the synchronous accuracy of the lifting and lowering movements of the multiple plunger hydraulic cylinders 201; at the same time, the accumulated error in the operation of the synchronous motor 301 is eliminated by setting the oil chamber residual liquid circuit 1, so that each plunger hydraulic cylinder 201 returns to the initial zero position, thereby ensuring that the system meets the production process requirements for a long time.

[0089] In summary, the RH hot-bending pipe synchronous lifting hydraulic system provided by the utility model significantly improves the sealing accuracy between the hot-bending pipe and the vacuum pipeline and the vacuum tank through the coordinated arrangement of the synchronous motor 301 and the oil chamber residual liquid circuit 1, and greatly shortens the adjustment time. At the same time, the improvement of the sealing accuracy can effectively alleviate the amount of gas entering the vacuum pipeline from the atmosphere during RH vacuum refining, thereby greatly reducing the system energy consumption during RH vacuum extraction and shortening the RH vacuum processing time; in addition, since the requirements for synchronization accuracy are reduced while meeting the production process, the costs of initial investment and subsequent maintenance are greatly reduced, and both from the perspective of production and equipment use and maintenance, it has obvious cost-reduction and efficiency-increasing effects.

[0090] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A RH hot-bending pipe synchronous lifting hydraulic system, characterized in that: It includes a hydraulic pump station, an actuator with multiple sets of hydraulic cylinder assemblies, and a control valve station on which a synchronous motor, a first electromagnetic reversing valve and a second electromagnetic reversing valve are arranged; The hydraulic pump station is connected to the control valve station through an oil supply pipeline and an oil return pipeline; The hydraulic cylinder assembly includes a plunger hydraulic cylinder and a hydraulically controlled one-way valve; the hydraulically controlled one-way valve is connected between the plunger hydraulic cylinder and the synchronous motor, and can allow oil to flow from the synchronous motor to the plunger hydraulic cylinder; the plunger hydraulic cylinder is connected to the oil return pipeline through an oil chamber residual liquid circuit, and the oil chamber residual liquid circuit is used to empty the residual medium in the oil chamber of the plunger hydraulic cylinder; The first electromagnetic reversing valve is connected to the oil supply pipeline, the synchronous motor and the oil return pipeline, and the first electromagnetic reversing valve can make the oil flow from the oil supply pipeline to the synchronous motor, or the first electromagnetic reversing valve can make the oil flow from the synchronous motor to the oil return pipeline; The second electromagnetic reversing valve is connected to the control oil port of the hydraulically controlled one-way valve, the oil supply pipeline and the oil return pipeline. The second electromagnetic reversing valve can reversely open the hydraulically controlled one-way valve to allow oil to flow from the plunger hydraulic cylinder to the synchronous motor.

2. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 1 is characterized in that: A first switch valve is provided on the residual liquid circuit of the oil chamber.

3. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 2 is characterized in that: The first solenoid reversing valve is a three-position four-way solenoid reversing valve, and the first solenoid reversing valve has a first pressure oil port, a first return oil port, a first working oil port and a second working oil port. The first pressure oil port is connected to the oil supply pipeline through a first pipeline, the first return oil port is connected to the return oil pipeline through a second pipeline, the first working oil port is connected to the synchronous motor through a third pipeline, and the second working oil port is a closed port.

4. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 3 is characterized in that: The second solenoid reversing valve is a two-position four-way solenoid reversing valve, which has a second pressure oil port, a second oil return port, a third working oil port and a fourth working oil port. The second pressure oil port is connected to the oil supply pipeline through a fourth pipeline, the second oil return port is connected to the oil return pipeline through a fifth pipeline, the third working oil port is a closed port, and the fourth working oil port is connected to the control oil port of the hydraulically controlled one-way valve through a sixth pipeline.

5. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 4 is characterized in that: The second pipeline is provided with a first one-way valve; the fifth pipeline is provided with a second one-way valve.

6. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 5 is characterized in that: The third pipeline is provided with a one-way throttle valve.

7. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 6 is characterized in that: The hydraulically controlled one-way valve is connected to the synchronous motor via a seventh pipeline, and a second switch valve is provided on the seventh pipeline.

8. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 7 is characterized in that: A main pressure measuring joint is connected on the oil supply pipeline and near the hydraulic pump station, a first pressure measuring joint is connected on the third pipeline and located between the first solenoid reversing valve and the one-way throttle valve, a second pressure measuring joint is connected on the sixth pipeline and located between the branch connecting pipeline of the hydraulically controlled one-way valve and the second solenoid reversing valve, and a third pressure measuring joint is connected on the seventh pipeline and located between the second switch valve and the synchronous motor.

9. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 8, characterized in that: A main switch valve is provided on the oil supply pipeline and between the hydraulic pump station and the main pressure measuring joint, a third switch valve is provided on the first pipeline and between the fourth pipeline and the oil supply pipeline, and a fourth switch valve is provided on the sixth pipeline and between the second solenoid reversing valve and the second pressure measuring joint.

10. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 9, characterized in that: The oil supply pipeline is connected to the oil return pipeline through an eighth pipeline, and a fifth switch valve is provided on the eighth pipeline.

11. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 10, characterized in that: A third one-way valve is provided on the oil return pipeline and at a position close to the hydraulic pump station.

12. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 11, characterized in that: The first switch valve, the first one-way valve, the second one-way valve, the one-way throttle valve, the second switch valve, the main pressure measuring joint, the first pressure measuring joint, the third pressure measuring joint, the main switch valve, the third switch valve, the fourth switch valve, the fifth switch valve, and the third one-way valve are all located on the control valve platform.

13. The RH hot-bending pipe synchronous lifting hydraulic system according to claim 1, characterized in that: A valve block is provided on the plunger type hydraulic cylinder, and the hydraulically controlled one-way valve is arranged in the valve block.

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