Hydraulic system of thick plate on-line steel equipment

Abstract

The utility model discloses a thick plate on-line steel equipment hydraulic system, according to the order of oil supply, including internal oil supply circuit, reversing oil circuit, synchronous oil circuit, drive unit and speed regulation oil circuit, reversing oil circuit includes electro-hydraulic directional valve, synchronous oil circuit includes multiple sets of hydraulic motor, multiple sets of hydraulic motor are connected with the same rotary shaft through shaft and shaft sleeve, and the rotary shaft is connected with the drive unit. Each group of hydraulic motors is connected with an overflow valve, the driving unit comprises a plurality of groups of hydraulic cylinders, the speed regulation oil way comprises a plurality of groups of rectification stacking plates which are connected in parallel, and an adjustable throttling valve is arranged in the middle of the rectification stacking plates; the hydraulic lifting device is reasonable in structural design, synchronous lifting of the oil cylinders can be achieved by connecting a plurality of hydraulic motors through the synchronizing shaft, accurate synchronization is achieved through the overflow valve, and production efficiency and rhythm are improved.

Description

Technical Field

[0001] The utility model relates to a hydraulic system on a thick plate production line, in particular to a hydraulic system for steel equipment on a thick plate production line. Background Art

[0002] Since many domestic industries have a particularly large demand for the production capacity of medium and thick plates, the steel loading equipment on the hot rolling wide and thick plate line transfers the thick plates from the roller conveyor chain to the cooling bed roller. At present, the hydraulic circuit of the steel loading equipment on the hot rolling wide and thick plate line is controlled by a valve group output oil flow of a group of large-flow electro-hydraulic reversing valves to control three groups of hydraulic cylinders in parallel, or by three groups of small-flow electromagnetic reversing valves to control the three groups of hydraulic cylinders respectively. Such control is difficult to ensure that the three groups of hydraulic cylinders act at the same time, and the trolley can only be moved after all of them are lifted. Due to the inconsistent synchronization rate, the action time is prolonged, which will affect the output and quality, and thus affect the production efficiency. Utility Model Content

[0003] The utility model aims to solve the problem of inconsistent synchronization rates of multiple driving oil cylinders at present, and provides a hydraulic system for thick plate line steel equipment. The system comprises an internal oil supply circuit, a reversing oil circuit, a synchronization oil circuit, a driving unit and a speed regulating oil circuit according to the oil supply sequence. The reversing oil circuit comprises an electro-hydraulic reversing valve, the synchronization oil circuit comprises a plurality of groups of hydraulic motors, the plurality of groups of hydraulic motors are connected to the same rotating shaft by shafts and sleeves, each group of hydraulic motors is connected to a relief valve, the driving unit comprises a plurality of groups of hydraulic cylinders, the speed regulating oil circuit comprises a plurality of groups of parallel rectifier stacking plates, and an adjustable flow valve is arranged in the middle of the rectifier stacking plates.

[0004] Preferably, a balancing oil circuit is arranged between the reversing oil circuit and the synchronous oil circuit, and the balancing oil circuit includes a balancing valve, a balancing valve, the A end of the balancing valve is connected to the electro-hydraulic reversing valve, the B end is connected to multiple groups of hydraulic motors, and the X end of the auxiliary oil circuit is connected to the speed regulating oil circuit.

[0005] Preferably, the hydraulic motor is connected to a one-way valve.

[0006] Preferably, a pressure measuring joint is provided on the internal oil supply line.

[0007] The beneficial effects of the utility model are as follows: the utility model has a reasonable structural design, can connect multiple hydraulic motors through a synchronous shaft to achieve synchronous rising of the oil cylinders, and can perform precise synchronization through the overflow valve to improve production efficiency and rhythm. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a structural diagram of the reversing oil circuit;

[0011] Figure 3 It is a structural diagram of the synchronous oil circuit;

[0012] Figure 4 It is a structural diagram of the speed regulating oil circuit;

[0013] Figure 5 It is a structural diagram of the balanced oil circuit;

[0014] In the figure: 1. Internal oil supply circuit; 1.2. Pressure measuring joint; 2. Reversing oil circuit; 2.1. Electro-hydraulic reversing valve; 3. Synchronous oil circuit; 3.1. Hydraulic motor; 3.2. Overflow valve; 3.3. Check valve; 3.4. Rotating shaft; 4. Drive unit; 4.1. Hydraulic cylinder; 5. Speed ​​control oil circuit; 5.1. Rectifier superposition plate; 5.2. Adjustable flow valve; 6. Balance oil circuit; 6.1. Balance valve. DETAILED DESCRIPTION

[0015] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0016] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0017] like Figure 1 As shown, a hydraulic system of a thick plate line steel equipment includes an internal oil supply circuit 1, a reversing oil circuit 2, a synchronous oil circuit 3, a drive unit 4 and a speed regulating oil circuit 5 according to the oil supply sequence. Figure 2 As shown, the reversing oil circuit 2 includes an electro-hydraulic reversing valve 2.1. Figure 3 As shown, the synchronous oil circuit 3 includes multiple groups of hydraulic motors 3.1, and the multiple groups of hydraulic motors 3.1 are connected to the same rotating shaft 3.4 by shafts and sleeves. Each group of hydraulic motors is connected to a relief valve 3.2. The driving unit 4 includes multiple groups of hydraulic cylinders 4.1. Figure 4 As shown, the speed regulating oil circuit 5 includes a plurality of parallel rectifier stacking plates 5.1, and an adjustable flow valve 5.2 is arranged in the middle of the rectifier stacking plates 5.1; the internal oil supply circuit 1 includes an oil supply circuit and an oil return circuit, which supply and return oil to the entire hydraulic system.

[0018] A balancing oil circuit 6 is provided between the reversing oil circuit 2 and the synchronous oil circuit 3. Figure 5As shown, the balancing oil circuit 6 includes a balancing valve 6.1, the A end of the balancing valve is connected to the electro-hydraulic reversing valve 2.1, the B end is connected to the multiple hydraulic motors 3.1, and the X end of the auxiliary oil circuit is connected to the speed regulating oil circuit 5; the function of the balancing oil circuit 6 is to lock the drive unit 4 to prevent it from falling when the oil circuit is broken or leaking; when the speed regulating oil circuit 5 is under pressure, the X end of the auxiliary oil circuit of the balancing valve 6.1 is pushed open, and the A end to the B end are unobstructed. When the oil circuit is broken or leaking, the speed oil circuit 5 is without pressure, the X end of the auxiliary oil circuit is closed, and it is switched to a one-way locking position to lock the pressure of the cylinder oil circuit to prevent it from falling.

[0019] The hydraulic motor 3.1 is connected with a one-way valve 3.3; when the hydraulic motor 3.1 is pulled by other motors to generate negative pressure, the one-way valve opens and the oil in the return oil circuit is added to the negative pressure hydraulic motor, thereby ensuring the same flow rate as other motors.

[0020] The internal oil supply circuit 1 is provided with a pressure measuring joint 1.2 for manually detecting the pressure of the oil circuit.

[0021] During operation, when the internal oil supply circuit 1 supplies oil to the hydraulic system, the electro-hydraulic reversing valve 2.1 reverses the oil circuit. First, the hydraulic oil enters the electro-hydraulic reversing valve 2.1 and the balancing valve 6.1, and then enters each group of hydraulic motors 3.1. Since multiple groups of hydraulic motors 3.1 are connected through a through shaft, the rotation speeds are consistent. If the loads of the two hydraulic cylinders are different, the hydraulic motor with a small load and a large flow rate will rotate fast, and the hydraulic motor with a large load and a small flow rate will rotate slowly, resulting in asynchronism. However, the motors are connected together, and the fast one drives the slow one. The slow hydraulic motor moves at the same speed, and the slow hydraulic motor forms a negative pressure. The one-way valve opens, and the oil in the oil return circuit is supplemented to the negative pressure hydraulic motor, thereby ensuring the same flow rate as other motors and achieving synchronization of the hydraulic cylinders.

[0022] The synchronization error of the stroke endpoints of the multiple groups of hydraulic cylinders 4.1 in the drive unit 4 is eliminated by the overflow oil circuit composed of the overflow valve 3.2 and the one-way valve 3.3. The oil is sent to the rod chamber of the hydraulic cylinder through the hydraulic motor 3.1, and the trolley rises. During this process, if the pressure of any hydraulic cylinder oil circuit exceeds the set pressure of the overflow valve, the overflow valve opens to unload the excess oil; during this process, if the pressure of one hydraulic cylinder is greater than that of the other two hydraulic cylinders, the pressure is automatically released to the same pressure as the other two hydraulic cylinders through the overflow valve.

[0023] During the oil return process, the oil passes through the speed regulating oil circuit 5 and passes through the rectifying superposition plate 5.1. The rectifying superposition plate 5.1 is composed of four one-way valves and can only pass through the upper right one-way valve, then through the middle adjustable flow valve 5.2, and then through the lower left one-way valve to go out. Since the throttle valve is an adjustable design, the cylinder speed can be adjusted, thereby adjusting the cylinder retreat speed. Conversely, the oil supply also needs to pass through the adjustable flow valve 5.2 for speed regulation.

[0024] The beneficial effects of the utility model are as follows: the utility model has a reasonable structural design, can connect multiple hydraulic motors through a synchronous shaft to achieve synchronous rising of the oil cylinders, and can achieve precise synchronization through the overflow valve to improve production efficiency and rhythm; the overflow valve in the system can directly relieve pressure to better protect the equipment movement; the system automatically coordinates the actions of each hydraulic cylinder to achieve high-precision synchronization; the service life of the equipment is greatly improved; the synchronization accuracy is increased from the original 8% to within 2%; and the production rhythm efficiency is increased by 10%.

[0025] The present invention is not limited to the above-mentioned specific implementation modes, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A hydraulic system for thick plate line steel equipment, characterized in that: According to the oil supply sequence, the oil supply circuit comprises an internal oil supply circuit (1), a reversing oil circuit (2), a synchronous oil circuit (3), a drive unit (4) and a speed regulating oil circuit (5); the reversing oil circuit (2) comprises an electro-hydraulic reversing valve (2.1); the synchronous oil circuit (3) comprises a plurality of hydraulic motors (3.1); the plurality of hydraulic motors (3.1) are connected to the same rotating shaft (3.4) by shafts and shaft sleeves; each hydraulic motor is connected to a relief valve (3.2); the drive unit (4) comprises a plurality of hydraulic cylinders (4.1); the speed regulating oil circuit (5) comprises a plurality of parallel-connected rectifying stacking plates (5.1); and an adjustable flow valve (5.2) is arranged in the middle of the rectifying stacking plates (5.1).

2. A thick plate line steel equipment hydraulic system according to claim 1, characterized in that: A balancing oil circuit (6) is provided between the reversing oil circuit (2) and the synchronous oil circuit (3), the balancing oil circuit (6) comprising a balancing valve (6.1), the balancing valve A end being connected to the electro-hydraulic reversing valve (2.1), the B end being connected to the plurality of hydraulic motors (3.1), and the auxiliary oil circuit X end being connected to the speed regulating oil circuit (5).

3. The hydraulic system for thick plate line steel equipment according to claim 1, characterized in that: The hydraulic motor (3.1) is connected to a one-way valve (3.3).

4. The hydraulic system for thick plate line steel equipment according to claim 1, characterized in that: The internal oil supply circuit (1) is provided with a pressure measuring joint (1.2).

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