Steckel mill roll changing device hydraulic system and control method thereof

Abstract

The invention provides a hydraulic system for a roll changing device of a steckel mill, which relates to the technical field of steckel mill equipment and comprises a ball valve I, a ball valve II, an external control and internal leakage hydraulic control one-way valve I, a one-way valve I, a proportional directional valve I, an electromagnetic directional valve, a pressure measuring joint, an external control and internal leakage hydraulic control one-way valve II, a one-way valve II and a proportional directional valve II, when pressure oil of a hydraulic system enters a rodless cavity of a supporting roll changing cylinder through a proportional reversing valve I, hydraulic oil on the rod cavity side of the supporting roll changing cylinder is cut off at a one-way valve II, and at the moment, the hydraulic oil on the rod cavity side enters the rodless cavity side of the supporting roll changing cylinder through an external control internal drainage hydraulic control one-way valve IIA; a differential principle that a supporting roll changing cylinder extends out is formed by converging with pressure oil of a hydraulic system; when pressure oil of the hydraulic system enters the rod cavity side of the supporting roll changing cylinder through the proportional reversing valve I, hydraulic oil on the rodless cavity side of the supporting roll changing cylinder returns to the oil tank through the external control internal leakage hydraulic control one-way valve I, and retraction of the supporting roll changing cylinder is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of Steckel mill equipment, and in particular to a hydraulic system of a roll changing device of a Steckel mill and a control method thereof. Background Art

[0002] Steckel mill, also known as Steckel mill, is a steel plate rolling mill. Its production line usually consists of a heating furnace, a reversible main rolling mill, a steel plate collection system including a coiler, and other auxiliary equipment. The main rolling mill of the Steckel mill is equipped with a furnace coiler before and after. During the rolling process of thin-gauge coils, the steel plates can be coiled in the furnace for insulation to reduce the temperature drop rate of the steel plates during rolling. This design enables the Steckel mill to improve production efficiency and reduce production costs while ensuring product quality. In addition, the Steckel mill is also equipped with a coil temperature detection system, which adjusts process parameters to ensure product uniformity and consistency by monitoring the temperature of the material entering and exiting the rolls, as well as the thickness reduction of the coil each time it is rolled and the number of times it passes through the mill. This fine control not only improves product quality, but also increases production flexibility. The hydraulic system of the roll changing device of the furnace coil mill is mainly used to complete the work roll lateral movement and support roll changing. Since the working roll lateral movement cylinder and the support roll changing cylinder need to provide large load and large flow, but the frequency of roll changing is not very high, it is only used when repairing and changing rolls. In order to reduce the flow of the hydraulic pump and reduce the model specifications of the hydraulic pump and hydraulic valve, the hydraulic system of the roll changing device adopts a hydraulic differential circuit, which not only realizes the process requirements of large load and large flow, but also reduces the model specifications of the hydraulic pump and hydraulic valve, meets the production needs, and reduces the production cost of the hydraulic system.

[0003] At present, the most widely used and common differential principle of the hydraulic system of the roll changing device of the furnace coil rolling mill on the market is to set two one-way valves in the hydraulic cylinder rod chamber circuit. When the hydraulic cylinder is extended, one one-way valve prevents the hydraulic oil in the hydraulic cylinder rod chamber from returning to the oil tank through the B→T port of the reversing valve, and the other one-way valve allows the hydraulic oil in the hydraulic cylinder rod chamber to return to the main pressure oil P pipeline of the hydraulic system of the roll changing device of the furnace coil rolling mill through the one-way valve itself, so as to realize the differential function of the hydraulic system of the roll changing device of the furnace coil rolling mill. For details, see Figure 1 Although this differential circuit reduces the system flow and the model specifications of the hydraulic pump and hydraulic valve, this principle solution can only be applied to the working condition where the mechanical load is horizontal. If the mechanical load is not horizontal, but vertical or inclined, a negative load force will be generated during the mechanical load decrease process, and the oil pressure at the A or B port of the proportional valve will decrease instantaneously. The low-pressure oil cannot open the superimposed hydraulic control one-way valve, causing the actuator to creep.

[0004] The existing differential principle scheme of the hydraulic system of the roll changing device (such as Figure 1), the electromagnet b of the proportional reversing valve 5 is energized and switched to P→A, B→T, the main pressure oil of the hydraulic system passes through the ball valve 1.1, P→A of the proportional reversing valve 5, the one-way valve A→B of the superimposed hydraulic one-way valve 3.1 on the rodless chamber side of the cylinder, and the ball valve 11 to enter the rodless chamber side of the support roller changing cylinder, and the hydraulic oil on the rod chamber side of the support roller changing cylinder reaches the A end of the one-way valve 9.1 and the B end of the one-way valve 9.2 through the ball valve 1.2. Since the B→A oil circuit of the one-way valve 9.2 is cut off, the hydraulic oil on the rod chamber side of the support roller changing cylinder can only enter the P port of the proportional reversing valve 5 through the A→B of the one-way valve 9.1, merge with the main pressure oil of the hydraulic system and enter the P→A of the proportional reversing valve 5 again, thus forming the differential principle of the extension of the support roller changing cylinder. The electromagnet a of the proportional reversing valve 5 is energized and switched to P→B, A→T. The main pressure oil of the hydraulic system passes through the ball valve 1.1, the P→B ​​of the proportional reversing valve 5, and the one-way valve A→B on the rod chamber side of the oil cylinder of the superimposed hydraulic control one-way valve 3.1 (at the same time, the one-way valve B→A oil circuit on the rodless chamber side of the oil cylinder is opened), and the ball valve 1.2 enters the rod chamber side of the support roller change cylinder. The pressure oil on the rodless chamber side of the support roller change cylinder passes through the ball valve 11, the one-way valve B→A on the rodless chamber side of the oil cylinder of the superimposed hydraulic control one-way valve 3.1, and the proportional reversing valve 5 A→T back to the oil tank, realizing the retraction of the support roller change cylinder. The differential principle of the working roll traverse cylinder is similar. Summary of the invention

[0005] According to the technical problems mentioned in the above background technology, a hydraulic system and control method of a roll changing device of a furnace coil mill are provided. The present invention mainly further reduces the model specifications of the proportional reversing valve, reduces the production cost of the hydraulic system of the roll changing device, and adopts a hydraulic differential system realized by an externally controlled internally leaking hydraulically controlled one-way valve, so that the hydraulic system responds more quickly, has more stable and reliable performance, and has a wider range of applications. It can well open the hydraulically controlled one-way valve, solves the problem that the superimposed hydraulically controlled one-way valve cannot be opened under negative load conditions, resulting in mechanical load creeping, and enables it to be applied in a wider range of working conditions.

[0006] The technical means adopted by the present invention are as follows:

[0007] A hydraulic system for a roll changing device of a Steckel mill, comprising:

[0008] Ball valve I, ball valve II, external control internal leakage liquid control check valve I, check valve I, proportional reversing valve I, solenoid reversing valve, pressure measuring joint, external control internal leakage liquid control check valve II, check valve II and proportional reversing valve II;

[0009] The ball valve I comprises: a ball valve IA, a ball valve IB and a ball valve IC;

[0010] The externally controlled internally leaking liquid-controlled one-way valve II comprises: an externally controlled internally leaking liquid-controlled one-way valve IIA and an externally controlled internally leaking liquid-controlled one-way valve IIB;

[0011] When the hydraulic system pressure oil enters the rodless chamber of the support roller changing cylinder through the proportional reversing valve I, the hydraulic oil on the rod chamber side of the support roller changing cylinder is cut off at the one-way valve II. At this time, the hydraulic oil on the rod chamber side enters the rodless chamber side of the support roller changing cylinder through the externally controlled internal leakage hydraulic control one-way valve IIA, and merges with the hydraulic system pressure oil to form the differential principle of the extension of the support roller changing cylinder.

[0012] When the hydraulic system pressure oil enters the rod chamber side of the support roller changing cylinder through the proportional reversing valve I, the hydraulic oil on the rodless chamber side of the support roller changing cylinder returns to the oil tank through the externally controlled internal leakage hydraulic control one-way valve I, thereby retracting the support roller changing cylinder.

[0013] Furthermore, the oil circuit B of the one-way valve II is in a cut-off state to the oil circuit A.

[0014] Furthermore, the electromagnetic reversing valve includes: an electromagnetic reversing valve I and an electromagnetic reversing valve II.

[0015] Furthermore, the electromagnet b of the proportional reversing valve I is energized, the electromagnet a of the electromagnetic reversing valve I is energized, and the externally controlled internal leakage hydraulically controlled one-way valve IIA is opened in the reverse direction; the main pressure oil of the hydraulic system enters the rodless cavity side of the support roller changing cylinder through the ball valve IA, and the hydraulic oil on the rod cavity side of the support roller changing cylinder reaches the B end of the one-way valve II and the B end of the externally controlled internal leakage hydraulically controlled one-way valve IIA through the ball valve IC, and merges with the main pressure oil of the hydraulic system to form the differential principle of the extension of the support roller changing cylinder.

[0016] Furthermore, the electromagnet a of the proportional reversing valve I is energized, the electromagnet b of the electromagnetic reversing valve I is energized, the externally controlled internal leakage hydraulically controlled one-way valve I is opened in reverse, and the hydraulic system pressure oil reaches the externally controlled internal leakage hydraulically controlled one-way valve IIAB end, enters the rod cavity side of the support roller changing cylinder through the ball valve IC, and the hydraulic oil on the rodless cavity side of the support roller changing cylinder reaches the externally controlled internal leakage hydraulically controlled one-way valve I through the ball valve IA, and then returns to the oil tank through the proportional reversing valve I, thereby realizing the retraction of the support roller changing cylinder.

[0017] Furthermore, the opening and closing of the externally controlled internal leakage liquid-controlled one-way valve II is controlled by the system pressure.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The optimized hydraulic differential principle scheme of the present invention is an improvement on the hydraulic differential principle scheme of the existing roll changing device and its control method, further reducing the model specifications of the proportional reversing valve and reducing the production cost of the hydraulic system of the roll changing device.

[0020] The optimized hydraulic differential principle scheme of the present invention adopts an externally controlled internally leaking hydraulically controlled one-way valve to realize hydraulic differential. The opening of the externally controlled internally leaking hydraulically controlled one-way valve depends on the system pressure. The stable system pressure can well open the hydraulically controlled one-way valve, which solves the problem that the superimposed hydraulically controlled one-way valve cannot be opened under negative load conditions, resulting in mechanical load creeping, so that it can be used in a wider range of working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 The present invention is a schematic diagram of the hydraulic system of a roll changing device of a Steckel mill in the prior art.

[0023] Figure 2 This is a schematic diagram of the hydraulic system of the roll changing device of the Steckel mill of the present invention.

[0024] In the figure: 1. ball valve I; 2. ball valve II; 3. external control internal leakage hydraulic control non-return valve; 3', superimposed hydraulic control non-return valve; 4. non-return valve I; 5. proportional reversing valve; 6. solenoid reversing valve; 7. pressure measuring joint; 8. external control internal leakage hydraulic control non-return valve II; 9. non-return valve II; 10. proportional reversing valve; 11. ball valve III. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] like Figure 2 As shown, the present invention provides a hydraulic system for a roll changing device of a Steckel mill, comprising: a ball valve I1, a ball valve II2, an externally controlled internally leaking hydraulically controlled one-way valve I3, a one-way valve I4, a proportional reversing valve I5, an electromagnetic reversing valve 6, a pressure measuring joint 7, an externally controlled internally leaking hydraulically controlled one-way valve II8, a one-way valve II9 and a proportional reversing valve II10;

[0028] The pressure measuring joint 7 is used to detect the pressure of the hydraulic system; the proportional reversing valve II10 is used to control the direction and speed of the actuator.

[0029] The ball valve I1 includes: a ball valve IA1.1, a ball valve IB1.2 and a ball valve IC1.3; in the present application, the ball valve IA1.1, the ball valve IB1.2 and the ball valve IC1.3 can manually close the flow of pressure oil in the corresponding pipelines when the actuator is overhauled.

[0030] The externally controlled internal leakage liquid-controlled one-way valve II8 comprises: an externally controlled internal leakage liquid-controlled one-way valve IIA8.1 and an externally controlled internal leakage liquid-controlled one-way valve IIB8.2;

[0031] When the hydraulic system pressure oil enters the rodless chamber of the support roller changing cylinder through the proportional reversing valve I5, the hydraulic oil on the rod chamber side of the support roller changing cylinder is cut off at the one-way valve II9. At this time, the hydraulic oil on the rod chamber side enters the rodless chamber side of the support roller changing cylinder through the external control internal leakage hydraulic control one-way valve IIA8.1 (at this time, the electromagnetic reversing valve 6.1 opens the B→A oil port of this hydraulic control one-way valve) and merges with the hydraulic system pressure oil to form the differential principle of the extension of the support roller changing cylinder.

[0032] When the hydraulic system pressure oil enters the rod chamber side of the support roller changing cylinder through the proportional reversing valve I5, the hydraulic oil on the rodless chamber side of the support roller changing cylinder returns to the oil tank through the externally controlled internal leakage hydraulic control one-way valve I3, thereby retracting the support roller changing cylinder.

[0033] In the present application, the B oil path to the A oil path of the one-way valve II9 is ​​in a cut-off state.

[0034] Preferably, in the present application, as a preferred embodiment, the electromagnetic reversing valve 6 includes: an electromagnetic reversing valve I6.1 and an electromagnetic reversing valve II6.2.

[0035] As a preferred embodiment, the electromagnet b of the proportional reversing valve I5 is energized, the electromagnet a of the electromagnetic reversing valve I6.1 is energized, and the externally controlled internal leakage hydraulically controlled one-way valve IIA8.1 is opened in the reverse direction; the main pressure oil of the hydraulic system enters the rodless cavity side of the support roller changing cylinder through the ball valve IA1.1, and the hydraulic oil on the rod cavity side of the support roller changing cylinder reaches the B end of the one-way valve II9 and the B end of the externally controlled internal leakage hydraulically controlled one-way valve IIA8.1 through the ball valve IC1.2, and merges with the main pressure oil of the hydraulic system to form the differential principle of the extension of the support roller changing cylinder.

[0036] As a preferred embodiment, the electromagnet a of the proportional reversing valve I5 is energized, the electromagnet b of the electromagnetic reversing valve I6.1 is energized, the externally controlled internal leakage hydraulically controlled one-way valve I3 is opened in the reverse direction, and the hydraulic system pressure oil reaches the externally controlled internal leakage hydraulically controlled one-way valve IIA8.1B end, enters the rod cavity side of the support roller changing cylinder through the ball valve IC1.2, and the hydraulic oil on the rodless cavity side of the support roller changing cylinder reaches the externally controlled internal leakage hydraulically controlled one-way valve I3 through the ball valve IA1.1, and then returns to the oil tank through the proportional reversing valve I5, thereby realizing the retraction of the support roller changing cylinder.

[0037] As a preferred embodiment, the opening and closing of the externally controlled internal leakage liquid-controlled one-way valve II8 is controlled by the system pressure.

[0038] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0039] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0040] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0041] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0042] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0043] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic system for a roll changing device of a Steckel mill, characterized in that: include: Ball valve I (1), ball valve II (2), external control internal leakage liquid control check valve I (3), check valve I (4), proportional reversing valve I (5), solenoid reversing valve (6), pressure measuring joint (7), external control internal leakage liquid control check valve II (8), check valve II (9) and proportional reversing valve II (10); The ball valve I (1) comprises: a ball valve IA (1.1), a ball valve IB (1.2) and a ball valve IC (1.3); The externally controlled internally leaking liquid-controlled one-way valve II (8) comprises: an externally controlled internally leaking liquid-controlled one-way valve IIA (8.1) and an externally controlled internally leaking liquid-controlled one-way valve IIB (8.2); When the hydraulic system pressure oil enters the rodless chamber of the support roller changing cylinder via the proportional reversing valve I (5), the hydraulic oil on the rod chamber side of the support roller changing cylinder is cut off at the one-way valve II (9). At this time, the hydraulic oil on the rod chamber side enters the rodless chamber side of the support roller changing cylinder via the externally controlled internally drained hydraulically controlled one-way valve IIA (8.1), and merges with the hydraulic system pressure oil to form the differential principle of the extension of the support roller changing cylinder. When the hydraulic system pressure oil enters the rod chamber side of the support roller changing cylinder through the proportional reversing valve I (5), the hydraulic oil on the rodless chamber side of the support roller changing cylinder returns to the oil tank through the externally controlled internal leakage hydraulic control one-way valve I (3), thereby realizing the retraction of the support roller changing cylinder.

2. A hydraulic system for a roll changing device of a Steckel mill according to claim 1, characterized in that: The oil path B of the one-way valve II (9) is in a cut-off state to the oil path A.

3. The hydraulic system of a roll changing device of a Steckel mill according to claim 1, characterized in that: The electromagnetic reversing valve (6) comprises: an electromagnetic reversing valve I (6.1) and an electromagnetic reversing valve II (6.2).

4. A hydraulic system for a roll changing device of a Steckel mill according to claim 3, characterized in that: The electromagnet b of the proportional reversing valve I (5) is energized, the electromagnet a of the electromagnetic reversing valve I (6.1) is energized, and the externally controlled internally leaking hydraulically controlled one-way valve IIA (8.1) is opened in the reverse direction; the main pressure oil of the hydraulic system enters the rodless chamber side of the support roller changing cylinder through the ball valve IA (1.1), and the hydraulic oil on the rod chamber side of the support roller changing cylinder reaches the B end of the one-way valve II (9) and the B end of the externally controlled internally leaking hydraulically controlled one-way valve IIA (8.1) through the ball valve IC (1.2), and merges with the main pressure oil of the hydraulic system to form the differential principle of the extension of the support roller changing cylinder.

5. The hydraulic system of a roll changing device of a Steckel mill according to claim 3, characterized in that: The electromagnet a of the proportional reversing valve I (5) is energized, and the electromagnet b of the electromagnetic reversing valve I (6.1) is energized, and the externally controlled internally leaking hydraulically controlled one-way valve I (3) is reversely opened, and the hydraulic system pressure oil reaches the B end of the externally controlled internally leaking hydraulically controlled one-way valve IIA (8.1), and enters the rod chamber side of the support roller changing cylinder through the ball valve IC (1.2). The hydraulic oil on the rodless chamber side of the support roller changing cylinder reaches the externally controlled internally leaking hydraulically controlled one-way valve I (3) through the ball valve IA (1.1), and then returns to the oil tank through the proportional reversing valve I (5), thereby realizing the retraction of the support roller changing cylinder.

6. The hydraulic system of a roll changing device of a Steckel mill according to claim 1, characterized in that: The opening and closing of the externally controlled internally leaking liquid-controlled one-way valve II (8) is controlled by the system pressure.

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