A steel coil car lifting hydraulic system

Abstract

The utility model relates to a kind of steel coil car lifting hydraulic systems, including hydraulic cylinder, cartridge balance valve, first pipeline, second pipeline and the hydraulic valve table of controllable oil flow direction, flow and pressure, the cylinder body of the hydraulic cylinder has rod cavity and rodless cavity separated by piston, the hydraulic valve table with the rodless cavity is communicated by the first pipeline, and it is communicated by the second pipeline between the rod cavity, the rodless cavity and the first pipeline between the communication pipeline is equipped with the cartridge balance valve. The steel coil car lifting hydraulic system provided by the utility model solves the problem that the existing steel coil car lifting hydraulic circuit has high failure rate, is prone to vehicle slip, floating after parking, and other phenomena such as mysterious rising and falling.

Description

Technical Field

[0001] This utility model relates to the field of logistics coil transport equipment technology, and in particular to a hydraulic lifting system for steel coil trucks. Background Technology

[0002] In metallurgical steel rolling production lines, coil handling vehicles are among the most widely used coil transport equipment. Due to the weight of the coil handling vehicle itself plus the load of the coil, it often weighs tens of tons. This constant vertical downward load creates a significant difference in load during the lifting and lowering of the coil handling vehicle. The hydraulic lifting circuit design typically incorporates a balance valve in the descent return oil channel of the hydraulic valve platform. By dynamically balancing the pilot pressure and spring force, the return oil opening is adjusted to create a suitable back pressure during cylinder descent, stabilizing and controlling the descent speed of the coil handling vehicle. Furthermore, as this is heavy-duty coil transport equipment, for safety reasons, a shut-off valve needs to be added to the lifting hydraulic circuit of the coil handling vehicle. This shut-off valve has explosion-proof functionality and can quickly and automatically cut off the oil circuit in the event of a hydraulic line rupture, preventing the coil-carrying vehicle from rapidly falling and causing personnel or equipment accidents.

[0003] However, in actual engineering applications, the hydraulic circuit for lifting steel coil trucks has a high failure rate, with phenomena such as slippage, floating after stopping, and inexplicable rising and falling. Utility Model Content

[0004] The main purpose of this utility model is to propose a hydraulic lifting system for steel coil carts, which aims to solve the problems of high failure rate, slippage, floating after stopping, and inexplicable rising and falling of existing hydraulic lifting circuits for steel coil carts.

[0005] To achieve the above objectives, this utility model proposes a hydraulic system for lifting steel coil carts, comprising a hydraulic cylinder, a cartridge-type balance valve, a first pipe, a second pipe, and a hydraulic valve platform capable of controlling the flow direction, flow rate, and pressure of the hydraulic fluid. The cylinder body of the hydraulic cylinder has a rod chamber and a rodless chamber separated by a piston. The hydraulic valve platform is connected to the rodless chamber through the first pipe and to the rod chamber through the second pipe. The cartridge-type balance valve is provided on the connecting pipe between the rodless chamber and the first pipe.

[0006] According to some embodiments of the present invention, a pressure sensor is provided between the cartridge-type balance valve and the rodless chamber, and the pressure sensor is electrically connected to the controller.

[0007] According to some embodiments of this utility model, the cartridge-type balance valve is integrated into the oil outlet of the rodless chamber, so as to be integrated with the hydraulic cylinder.

[0008] According to some embodiments of the present invention, both the first pipe and the second pipe are provided with hydraulic locks.

[0009] According to some embodiments of this utility model, the hydraulic valve platform includes an oil supply pipe, an oil return pipe, and a proportional directional valve. The steel coil car lifting hydraulic system has an upward action state where, when the valve core of the proportional directional valve moves to the left, both the first pipe and the second pipe are connected to the parallel oil port of the proportional directional valve, so that oil enters the rodless chamber of the hydraulic cylinder and oil returns to the rod chamber; the steel coil car lifting hydraulic system also has a downward action state where, when the valve core of the proportional directional valve moves to the right, both the first pipe and the second pipe are connected to the cross oil port of the proportional directional valve, so that oil enters the rod chamber of the hydraulic cylinder and oil returns to the rodless chamber.

[0010] According to some embodiments of the present invention, the hydraulic valve platform further includes a one-way pressure reducing valve, an electromagnetic reversing valve, and an oil unloading pipeline. The one-way pressure reducing valve is provided on the connecting pipeline between the first pipeline and the parallel oil port of the proportional reversing valve, and the electromagnetic reversing valve is provided on the connecting pipeline between the one-way pressure reducing valve and the oil unloading pipeline.

[0011] According to some embodiments of the present invention, the hydraulic valve platform further includes a third pipeline and a hydraulically controlled check valve that can communicate with the first pipeline. The hydraulically controlled check valve is connected to the oil supply pipeline through the electromagnetic reversing valve and to the oil return pipeline through the third pipeline.

[0012] According to some embodiments of the present invention, the third pipe is connected to the first pipe, and the third pipe is provided with a first overflow valve whose overflow pressure is higher than the system pressure.

[0013] According to some embodiments of the present invention, the hydraulic valve platform further includes a fourth pipeline, and the hydraulic control check valve can also be connected to the return oil pipeline through the fourth pipeline. The fourth pipeline is provided with a second relief valve whose overflow pressure is lower than the system pressure.

[0014] This utility model has at least the following beneficial effects:

[0015] In this invention, during the hydraulic lifting action, the oil output from the oil supply pipe of the hydraulic valve platform flows sequentially through the first pipe and the cartridge-type balance valve, entering the rodless chamber of the hydraulic cylinder. At this time, the cartridge-type balance valve does not activate its balancing function. Simultaneously, the oil in the rod chamber of the hydraulic cylinder flows back through the second pipe to the return oil pipe of the hydraulic valve platform, causing the oil in the rodless chamber to gradually increase and the oil in the rod chamber to gradually decrease, thereby driving the piston to rise. During the hydraulic lowering action, the oil output from the oil supply pipe of the hydraulic valve platform flows through the second pipe into the rod chamber. Simultaneously, the oil in the rodless chamber flows sequentially through the cartridge-type balance valve and the first pipe back to the return oil pipe of the hydraulic valve platform. At this time, the cartridge-type balance valve generates a return oil back pressure, stabilizing and controlling the lowering speed, and preventing the piston from descending uncontrollably. Since the cartridge-type balance valve also has explosion-proof functionality, it is directly integrated into the connecting pipe between the rodless chamber of the hydraulic cylinder and the first pipe, replacing the original shut-off valve. This eliminates the need for a shut-off valve in the steel coil lifting hydraulic system, simplifying the hydraulic circuit and reducing manufacturing costs. Furthermore, traditional hydraulic circuits place the plate-type balance valve within the hydraulic valve seat, with tens of meters of steel pipe and a long cable chain between the plate-type balance valve and the hydraulic cylinder. Numerous pipe joints can lead to leaks, significantly reducing the balance valve's balancing function. This invention replaces the original large balance valve with a cartridge-type balance valve, directly integrating it into the connecting pipe between the rodless chamber of the hydraulic cylinder and the first pipe. This greatly shortens the distance between the cartridge-type balance valve and the hydraulic cylinder, ensuring its proper balancing function, reducing the hydraulic circuit failure rate, and solving problems such as slippage, floating after stopping, and unexplained rises and falls. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a hydraulic lifting system for a steel coil truck provided for an embodiment of this utility model;

[0018] Figure 2 for Figure 1 A magnified view of part A in the diagram.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100-Steel coil cart lifting hydraulic system; 1-Hydraulic cylinder; 11-Cylinder body; 111-Rod chamber; 112-Rodless chamber; 12-Piston; 2-Cartridge-type balance valve; 3-First pipeline; 4-Second pipeline; 5-Hydraulic valve platform; 51-Oil supply pipeline; 52-Oil return pipeline; 53-Proportional directional valve; 54-One-way pressure reducing valve; 55-Solenoid directional valve; 56-Oil unloading pipeline; 57-Hydraulic control check valve; 58-Third pipeline; 581-First relief valve; 59-Fourth pipeline; 591-Second relief valve; 6-Pressure sensor; 7-Hydraulic lock. Detailed Implementation

[0021] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] This utility model provides a hydraulic lifting system for steel coil carts. Figures 1 to 2 This invention provides a specific embodiment of a hydraulic lifting system for a steel coil truck.

[0025] like Figures 1 to 2As shown, this utility model embodiment provides a hydraulic system 100 for lifting steel coil carts, including a hydraulic cylinder 1, a cartridge-type balance valve 2, a first pipe 3, a second pipe 4, and a hydraulic valve platform 5 that can control the flow direction, flow rate, and pressure of the oil. The cylinder body 11 of the hydraulic cylinder 1 has a rod chamber 111 and a rodless chamber 112 separated by a piston 12. The hydraulic valve platform 5 is connected to the rodless chamber 112 through the first pipe 3 and to the rod chamber 111 through the second pipe 4. The cartridge-type balance valve 2 is provided on the connecting pipe between the rodless chamber 112 and the first pipe 3.

[0026] In this invention, during the hydraulic lifting action, the oil output from the oil supply pipe 51 of the hydraulic valve platform 5 flows sequentially through the first pipe 3 and the cartridge-type balance valve 2, and enters the rodless chamber 112 of the hydraulic cylinder 1. At this time, the cartridge-type balance valve 2 does not activate its balancing function. Simultaneously, the oil in the rod chamber 111 of the hydraulic cylinder 1 flows back through the second pipe 4 to the return oil pipe 52 of the hydraulic valve platform 5, causing the oil in the rodless chamber 112 to gradually increase and the oil in the rod chamber 111 to gradually decrease, thereby driving the piston 12 to rise. During the hydraulic lowering action, the oil output from the oil supply pipe 51 of the hydraulic valve platform 5 flows through the second pipe 4 into the rod chamber 111. Simultaneously, the oil in the rodless chamber 112 flows sequentially through the cartridge-type balance valve 2 and the first pipe 3, and returns to the return oil pipe 52 of the hydraulic valve platform 5. At this time, the cartridge-type balance valve 2 generates a return oil back pressure, which stabilizes and controls the lowering speed, preventing the piston 12 from descending uncontrollably. Since the cartridge-type balance valve 2 also has explosion-proof function, the cartridge-type balance valve 2 is directly installed on the connecting pipeline between the rodless chamber 112 of the hydraulic cylinder 1 and the first pipeline 3, replacing the original shut-off valve. This eliminates the need to install a shut-off valve in the steel coil lifting hydraulic system 100, simplifying the hydraulic circuit and reducing manufacturing costs. Meanwhile, because traditional hydraulic circuits place the plate-type balance valve inside the hydraulic valve seat 5, there is a steel pipe of tens of meters between the plate-type balance valve and the hydraulic cylinder 1, and a long drag chain hose in between. The numerous pipe joints can cause some leakage, which greatly reduces the balancing function of the balance valve. However, this utility model replaces the original large balance valve with a cartridge-type balance valve 2, and integrates the cartridge-type balance valve 2 directly into the connecting pipe between the rodless chamber 112 of the hydraulic cylinder 1 and the first pipe 3. This greatly shortens the distance between the cartridge-type balance valve 2 and the hydraulic cylinder 1, ensures the normal functioning of the cartridge-type balance valve 2, reduces the failure rate of the hydraulic circuit, and solves the problems of slippage, floating after stopping, and inexplicable rise and fall.

[0027] Preferably, in some embodiments, such as Figure 2As shown, a pressure sensor 6 is provided between the cartridge-type balance valve 2 and the rodless chamber 112. Both the pressure sensor 6 and the cartridge-type balance valve 2 are electrically connected to the controller. This configuration allows the pressure sensor 6 to detect the oil pressure in the rodless chamber 112 and send the pressure value to the controller for production line interlocking control.

[0028] It should be noted that in some embodiments, the cartridge-type balance valve 2 is integrated into the oil outlet of the rodless chamber 112, thus becoming an integral part of the hydraulic cylinder 1. This configuration, by integrating the cartridge-type balance valve 2 into the oil outlet of the rodless chamber 112 via a valve block, further shortens the distance between the cartridge-type balance valve 2 and the hydraulic cylinder 1, preventing pipeline leakage between the two from affecting the balancing function of the cartridge-type balance valve 2.

[0029] Because the valve block of the cartridge-type balance valve 2 requires high precision in machining and assembly, failure to meet these requirements can lead to oil leakage, which will compromise the operating accuracy of the hydraulic cylinder 1. In some embodiments, such as... Figure 1 As shown, both the first pipe 3 and the second pipe 4 are equipped with hydraulic locks 7. This configuration, by cooperating with the cartridge-type balance valve 2, cuts off the oil circuit, ensuring precise control.

[0030] Furthermore, in some embodiments, such as Figure 1As shown, the hydraulic valve platform 5 includes an oil supply pipe 51, an oil return pipe 52, and a proportional directional valve 53. The steel coil car lifting hydraulic system 100 has an upward action state when the valve core of the proportional directional valve 53 moves to the left, and both the first pipe 3 and the second pipe 4 are connected to the parallel oil port of the proportional directional valve 53 so that the rodless chamber 112 of the hydraulic cylinder 1 receives oil and the rod chamber 111 returns oil. The steel coil car lifting hydraulic system 100 also has a downward action state when the valve core of the proportional directional valve 53 moves to the right, and both the first pipe 3 and the second pipe 4 are connected to the cross oil port of the proportional directional valve 53 so that the rod chamber 111 of the hydraulic cylinder 1 receives oil and the rodless chamber 112 returns oil. With this configuration, when the valve core of the proportional directional valve 53 moves to the left under electrical control, and the first pipe 3 and the second pipe 4 are connected to the parallel oil port of the proportional directional valve 53, oil enters the rodless chamber 112 of the hydraulic cylinder 1, and oil returns to the rod chamber 111, causing the hydraulic cylinder 1 to perform an upward movement. When the valve core of the proportional directional valve 53 moves to the right under electrical control, and the first pipe 3 and the second pipe 4 are connected to the cross oil port of the proportional directional valve 53, oil enters the rod chamber 111 of the hydraulic cylinder 1, and oil returns to the rodless chamber 112, causing the hydraulic cylinder 1 to perform a downward movement. With this configuration, when the electrical control changes, the proportional directional valve 53 can control the direction of oil output and can control the output oil quantity according to the input current to adjust the operating speed of the hydraulic cylinder 1.

[0031] In some embodiments, such as Figure 1 As shown, the hydraulic valve platform 5 also includes a one-way pressure reducing valve 54, a solenoid directional valve 55, and an oil unloading pipeline 56. The one-way pressure reducing valve 54 is installed on the connecting pipeline between the first pipeline 3 and the proportional directional valve 53, and the solenoid directional valve 55 is installed on the connecting pipeline between the one-way pressure reducing valve 54 and the oil unloading pipeline 56. With this configuration, the pressure of the input oil can be adjusted by the cooperation of the one-way pressure reducing valve 54 and the solenoid directional valve 55 to achieve high and low pressure control for the upward movement.

[0032] In some embodiments, such as Figure 1 As shown, the hydraulic valve platform 5 also includes a third pipe 58 and a hydraulically controlled check valve 57 that can be connected to the first pipe 3. The hydraulically controlled check valve 57 is connected to the oil supply pipe 51 through the solenoid directional valve 55, and is connected to the oil return pipe 52 through the third pipe 58.

[0033] Specifically, in some embodiments, such as Figure 1As shown, the third pipe 58 is connected to the first pipe 3, and the third pipe 58 is equipped with a first overflow valve 581 whose overflow pressure is higher than the system pressure. The first overflow valve 581 is used for safety protection during high-pressure rise. When the oil pressure exceeds the overflow pressure, the first overflow valve 581 opens, allowing the oil in the first pipe 3 that exceeds the set pressure to flow through the third pipe 58 and into the return oil pipe 52.

[0034] Furthermore, in some embodiments, such as Figure 1 As shown, the hydraulic valve platform 5 also includes a fourth pipe 59. The hydraulically controlled check valve 57 can also be connected to the return oil pipe 52 through the fourth pipe 59. The fourth pipe 59 is equipped with a second relief valve 591 whose overflow pressure is lower than the system pressure. The second relief valve 591 is used for safety protection during low-pressure rise. When the oil pressure exceeds the overflow pressure, the second relief valve 591 opens, allowing the oil in the first pipe 3 that exceeds the set pressure to flow through the fourth pipe 59 into the return oil pipe 52.

[0035] The principle of the steel coil lifting hydraulic system 100 in this embodiment is as follows: During the high-pressure lifting operation, the electromagnet on the left side of the electromagnetic reversing valve 55 is energized, and the oil in the unloading port of the one-way pressure reducing valve 54 cannot return to the unloading pipeline 56 through the electromagnetic reversing valve 55. The one-way pressure reducing valve 54 does not reduce pressure, and at the same time, the pressure oil in the oil supply pipeline 51 cannot pass through the electromagnetic reversing valve 55, opening the hydraulic control one-way valve 57 and cutting off the bypass oil circuit. At this time, the right electromagnet of the proportional directional valve 53 is energized, and the oil output from the oil supply pipe 51 flows sequentially through the parallel port of the proportional directional valve 53, the one-way pressure reducing valve 54 (at this time, the one-way pressure reducing valve 54 does not reduce pressure), the first pipe 3, and the bypass one-way valve of the cartridge balance valve 2 (at this time, the cartridge balance valve 2 does not open the balance function), supplying oil to the rodless chamber 112. The oil in the rod chamber 111 flows sequentially through the second pipe 4 and the cross port of the proportional directional valve 53 back to the return pipe 52. The first relief valve 581 acts as an oil circuit safety valve, and its relief pressure is set higher than the system pressure. At this time, the oil pressure entering the hydraulic cylinder 1 is the system pressure, i.e., high pressure. During the low-pressure rise action, the right electromagnet of the electromagnetic directional valve 55 is energized, and the oil in the unloading port of the one-way pressure reducing valve 54 returns to the unloading pipe 56 through the electromagnetic directional valve 55. After unloading, the one-way pressure reducing valve 54 operates according to the pressure reducing setting value. At the same time, the oil in the oil supply pipeline 51 passes through the solenoid directional valve 55 to the hydraulic control one-way valve 57. The hydraulic control one-way valve 57 is opened, and the bypass oil circuit is connected. Since the overflow pressure of the second overflow valve 591 is set lower than the system pressure, it automatically acts as an oil circuit safety valve. At this time, the oil pressure entering the hydraulic cylinder 1 is the pressure set by the one-way pressure reducing valve 54, i.e., low pressure. During the descent action, the left electromagnet of the proportional directional valve 53 is energized. The oil output from the oil supply pipeline 51 flows through the cross port of the proportional directional valve 53 and directly supplies oil to the rod chamber 111. The oil in the rodless chamber 112 passes through the cartridge balance valve 2. At this time, the cartridge balance valve 2 generates a return oil back pressure. Then, it flows sequentially through the bypass one-way valve of the one-way pressure reducing valve 54 and the cross port of the proportional directional valve 53 back to the return oil pipeline 52.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic lifting system for a steel coil cart, characterized in that, The device includes a hydraulic cylinder, a cartridge-type balance valve, a first pipe, a second pipe, and a hydraulic valve platform that controls the direction, flow rate, and pressure of the hydraulic fluid. The cylinder body of the hydraulic cylinder has a rod chamber and a rodless chamber separated by a piston. The hydraulic valve platform is connected to the rodless chamber through the first pipe and to the rod chamber through the second pipe. The cartridge-type balance valve is installed on the connecting pipe between the rodless chamber and the first pipe.

2. The hydraulic lifting system for the steel coil cart as described in claim 1, characterized in that, A pressure sensor is provided between the cartridge-type balance valve and the rodless chamber, and the pressure sensor is electrically connected to the controller.

3. The hydraulic lifting system for the steel coil cart as described in claim 1, characterized in that, The cartridge-type balance valve is integrated into the oil outlet of the rodless chamber, thus becoming an integral part of the hydraulic cylinder.

4. The hydraulic lifting system for the steel coil cart as described in claim 1, characterized in that, Both the first pipe and the second pipe are equipped with hydraulic locks.

5. The hydraulic lifting system for the steel coil cart as described in claim 1, characterized in that, The hydraulic valve platform includes an oil supply pipe, an oil return pipe, and a proportional directional valve. The steel coil car lifting hydraulic system has an upward action state where, when the valve core of the proportional directional valve moves to the left, both the first pipe and the second pipe are connected to the parallel oil port of the proportional directional valve, so that oil enters the rodless chamber of the hydraulic cylinder and oil returns to the rod chamber; the steel coil car lifting hydraulic system also has a downward action state where, when the valve core of the proportional directional valve moves to the right, both the first pipe and the second pipe are connected to the cross oil port of the proportional directional valve, so that oil enters the rod chamber of the hydraulic cylinder and oil returns to the rodless chamber.

6. The hydraulic lifting system for the steel coil cart as described in claim 5, characterized in that, The hydraulic valve platform also includes a one-way pressure reducing valve, a solenoid directional valve, and an oil unloading pipeline. The one-way pressure reducing valve is provided on the connecting pipeline between the first pipeline and the parallel oil port of the proportional directional valve, and the solenoid directional valve is provided on the connecting pipeline between the one-way pressure reducing valve and the oil unloading pipeline.

7. The hydraulic lifting system for the steel coil cart as described in claim 6, characterized in that, The hydraulic valve platform also includes a third pipeline and a hydraulically controlled check valve that can communicate with the first pipeline. The hydraulically controlled check valve is connected to the oil supply pipeline through the solenoid directional valve and to the oil return pipeline through the third pipeline.

8. The hydraulic lifting system for the steel coil cart as described in claim 7, characterized in that, The third pipe is connected to the first pipe, and the third pipe is equipped with a first overflow valve whose overflow pressure is higher than the system pressure.

9. The hydraulic lifting system for the steel coil cart as described in claim 7, characterized in that, The hydraulic valve platform also includes a fourth pipe, and the hydraulic control check valve can also be connected to the return oil pipe through the fourth pipe. A second relief valve with an overflow pressure lower than the system pressure is provided on the fourth pipe.

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