Roll gap quick opening hydraulic system of twenty-high roll mill
By designing a quick opening hydraulic system in a twenty-roll rolling mill, using components such as high-pressure ball valve, check valve and fast lift valve, the problems of slow AGC cylinder pressure and small roller slot opening are solved, and the belt breakage or The rapid lifting during emergency stop protects the equipment and improves safety and efficiency.
Patent Information
- Application Number
- CN202420427943.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-06
AI Technical Summary
When rolling strip steel at Senjimil twenty-roll mill, the AGC cylinder pressing speed is slow and the roller slot opening is small, which makes it impossible to lift quickly when the strip is broken or urgently stopped, causing the steel strip to wrap around the rolling roller and damage the equipment.
Design a 20-roll mill rolling mill roll slot quickly open hydraulic system including oil cylinder, servo valve, guide member and auxiliary member, and realizes the high-pressure ball valve, one-way valve, pressure reducing valve, quick lift valve and energy accumulator and other components. Quick lift of AGC cylinder, adds quick lift circuit and relief valve to protect the equipment.
It realizes rapid lifting of the AGC cylinder during the broken belt or emergency stop, avoids the steel strip wrapping, protects the rolling rollers and transmission rollers, and improves the safety and efficiency of the equipment.
Smart Images
Figure CN222163045U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metallurgical machinery, in particular to a hydraulic system for quickly opening the roll gap of a twenty-roller rolling mill. Background Art
[0002] When the Sendzimir twenty-high mill is rolling strip steel, the normal pressing speed of the AGC cylinder is relatively slow, the stroke of the AGC cylinder is generally 140mm, and the speed of the AGC cylinder is generally 2cm / S; when the strip breaks or an emergency stop occurs, since the roll gap opening of the Sendzimir mill is designed to be relatively small, the AGC cylinder cannot be lifted up quickly and the roll gap cannot be opened quickly. When the strip breaks, the steel strip will be entangled on the rolls, causing steel piling, which will cause damage to the rolls and even damage to the drive rolls. Utility Model Content
[0003] The utility model aims to provide a hydraulic system for quickly opening the roll gap of a twenty-high rolling mill, which can quickly lift the AGC cylinder when the equipment detects a broken belt or when the equipment stops suddenly. The AGC cylinder can be quickly lifted when the hydraulic control valve needs to be in the middle position. When the AGC cylinder is quickly lifted, the load is small.
[0004] To achieve the above-mentioned purpose, the utility model provides a hydraulic system for quickly opening the roll gap of a twenty-high rolling mill, including a cylinder, a servo valve, an introduction component and an auxiliary component, the servo valve is connected to the cylinder, the introduction component is connected to the servo valve, and the auxiliary component is connected to the servo valve.
[0005] Wherein, the introduction component includes a high-pressure ball valve and a first one-way valve, the first one-way valve is connected to the servo valve; the high-pressure ball valve is connected to the first one-way valve.
[0006] Wherein, the auxiliary component includes a pressure reducing valve, a second one-way valve, a connecting component and a control component, the pressure reducing valve is connected to the first one-way valve; the second one-way valve is connected to the pressure reducing valve; the connecting component is connected to the pressure reducing valve; and the control component is connected to the second one-way valve.
[0007] Wherein, the connecting component comprises a manual lifting valve and a relief valve, the manual lifting valve is connected to the pressure reducing valve and to the oil cylinder; the relief valve is connected to the servo valve and to the manual lifting valve.
[0008] Wherein, the control component includes a quick lifting valve and an accumulator, and two quick lifting valves are provided, one of which is connected to the second one-way valve and the servo valve respectively, and the other quick lifting valve is connected to the manual lifting valve and the cylinder respectively; the accumulator is connected to the other quick lifting valve.
[0009] The utility model discloses a twenty-high rolling mill roll gap quick opening hydraulic system, through which high-pressure hydraulic oil passes through the high-pressure ball valve (V2.2) and the first one-way valve (CRF4A) into the P port of the servo valve, the servo valve is reversed, the valve core moves to the left, then the P port of the servo valve is connected with the A port, the T port is connected with the B port, the pressure oil passes through the servo valve into the upper chamber of the oil cylinder of the AGC, the oil in the lower chamber of the AGC enters the T port of the servo valve through the B port of the servo valve, and directly returns to the oil tank, the AGC cylinder moves downward, and the roll gap is opened; the valve core moves to the right, then the P port of the servo valve is connected with the A port, and the T port is connected with the B port. The port is connected to the B port, the T port is connected to the A port, the pressure oil passes through the servo valve into the lower chamber of the AGC cylinder, the oil in the upper chamber of the AGC enters the T port of the servo valve through the A port of the servo valve, and directly returns to the oil tank, the AGC cylinder moves upward, the roll gap is closed, and rolling is carried out; we added a quick lifting circuit to the original circuit, added the pressure reducing valve (RP10), the second one-way valve (CRF4B), the manual lifting valve (D5.2), the quick lifting valve (D8.7), the accumulator (VX1 and VY1), and the overflow valve (LP5.6); when a belt break or When the system is powered off, the quick lift valve (D8.7) loses power, the valve core moves to the right position, and the oil stored in the accumulator passes through the quick lift valve (D8.7) into the upper chamber of the AGC cylinder, while the oil in the lower chamber of the AGC cylinder also passes through another quick lift valve (D8.7) back to the tank, and the AGC cylinder is quickly lifted; the volume of the accumulator is 20L, which is much larger than the volume of the AGC cylinder 2.1L. The volume of the two AGC cylinders is 4.2L. The diameter of the quick lift valve (D8.7) is also much larger than the diameter of the servo. In order to achieve higher control precision, the servo valve The normal flow rate of the servo valve is 38L / MIN; the flow rate of the quick lift valve (D8.7) can reach 300L / MIN. In addition, the system adds the second check valve (CRF4B) after the pressure reducing valve (RP10) to prevent the oil in the accumulator from flowing to other positions during quick lifting or power failure; the system adds a two-way relief valve (LP5.6) to protect the AGC cylinder. When the equipment is abnormal, if the pressure of the AGC steel exceeds the set pressure of the relief valve, the relief valve will unload and release excess hydraulic oil to the tank to protect the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0011] Figure 1 It is a system diagram of the entire hydraulic system for quickly opening the roll gap of a twenty-high rolling mill according to an embodiment of the utility model.
[0012] Figure 2 It is a schematic diagram of the entire hydraulic system for quickly opening the roll gap of a twenty-high rolling mill according to an embodiment of the utility model.
[0013] In the figure: 1-oil cylinder, 2-servo valve, 3-high-pressure ball valve, 4-first one-way valve, 5-pressure reducing valve, 6-second one-way valve, 7-manual lifting valve, 8-overflow valve, 9-quick lifting valve, 10-accumulator. DETAILED DESCRIPTION
[0014] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0015] The embodiments of the present application are:
[0016] See also Figure 1 Zhihe Figure 2 ,in Figure 1 This is the overall system diagram of the twenty-high mill roll gap quick opening hydraulic system. Figure 2 It is the overall principle diagram of the hydraulic system for quickly opening the roll gap of a twenty-high rolling mill.
[0017] The utility model provides a hydraulic system for quickly opening the roll gap of a twenty-high rolling mill: comprising an oil cylinder 1, a servo valve 2, an introduction component and an auxiliary component, the introduction component comprising a high-pressure ball valve 3 and a first non-return valve 4, the auxiliary component comprising a pressure reducing valve 5, a second non-return valve 6, a connecting component and a control component, the connecting component comprising a manual lifting valve 7 and a relief valve 8, the control component comprising a quick lifting valve 9 and an accumulator 10, the above-mentioned scheme solves the problem that when the Sendzimir twenty-high rolling mill rolls strip steel, the normal pressing speed of the AGC cylinder is relatively slow, the stroke of the AGC cylinder is generally 140mm, and the speed of the AGC oil cylinder 1 is generally 2cm / S; when the strip is broken or the emergency stop occurs, since the roll gap opening degree of the Sendzimir rolling mill itself is designed to be relatively small, the AGC cylinder cannot be lifted quickly at present, and the roll gap cannot be opened quickly. When the strip is broken, the steel strip will be entangled on the roller to cause steel piling, which will cause the roller damage and even the transmission roller damage.
[0018] In this embodiment, the servo valve 2 is connected to the oil cylinder 1, the introduction member is connected to the servo valve 2, the auxiliary member is connected to the servo valve 2, the first check valve 4 is connected to the servo valve 2; the high-pressure ball valve 3 is connected to the first check valve 4, the pressure reducing valve 5 is connected to the first check valve 4; the second check valve 6 is connected to the pressure reducing valve 5; the connecting component is connected to the pressure reducing valve 5; the control component is connected to the second check valve 6, the manual lifting valve 7 is connected to the pressure reducing valve 5, and is connected to the The oil cylinder 1 is connected; the overflow valve 8 is connected to the servo valve 2 and to the manual lifting valve 7; two quick lifting valves 9 are provided, one quick lifting valve 9 is respectively connected to the second one-way valve 6 and the servo valve 2, and the other quick lifting valve 9 is respectively connected to the manual lifting valve 7 and the oil cylinder 1; the accumulator 10 is connected to the other quick lifting valve 9, and the accumulator 10 is provided with two, one large and one small, respectively, the large accumulator 10 (VX1) and the small accumulator 10 (VY1).
[0019] Among them, during normal operation, pressure enters from the high-pressure ball valve 3 (V2.2) and passes through the servo valve 2 (033YS101) to control the lifting and pressing of the AGC cylinder; at the same time, the hydraulic oil also passes through the pressure reducing valve 5 (LP11B), and the pressure is reduced to 6Mpa to fill the accumulator 10 (VX1), among which the small accumulator 10 (VY1) plays a role in absorbing pressure pulsation to ensure the pressure stability of the system; when the system detects a belt break or an emergency stop, the two quick lifting valves 9 (D8.7) lose power, the valve returns to the middle position, and the large accumulator 10 (VX1) is filled with The hydraulic oil quickly passes through the valve of the quick lifting valve 9 (D8.7) and enters the oil cylinder 1 from the upper chamber of the AGC. The hydraulic oil in the lower chamber of the AGC cylinder returns to the oil tank through another hydraulic solenoid valve of the quick lifting valve 9 (D8.7), which plays a role in quickly lifting the roller and opening the roller gap to the maximum. Since the effective volume of the accumulator 10 (VX1) is 20L, which is much larger than the volume of the two AGC cylinders, and the interface of the accumulator 10 is an M60*2 thread, and the connecting pipe is also large, the oil in the accumulator 10 can quickly enter the AGC cylinder and quickly lift the AGC cylinder.
[0020] When the twenty-high mill roll gap quick opening hydraulic system of the present embodiment is in use, high-pressure hydraulic oil passes through the high-pressure ball valve 3 (V2.2) and the first one-way valve 4 (CRF4A) into the P port of the servo valve 2, and the servo valve 2 is switched, the valve core moves to the left, then the P port of the servo valve 2 is connected with the A port, the T port is connected with the B port, the pressure oil passes through the servo valve 2 into the upper chamber of the oil cylinder 1 of the AGC, the oil in the lower chamber of the AGC passes through the B port of the servo valve 2 into the T port of the servo valve 2, and directly returns to the oil tank, the AGC cylinder moves downward, and the roll gap opens; the valve core moves to the right, then the servo valve The P port of 2 is connected with the B port, and the T port is connected with the A port. The pressure oil enters the lower chamber of the AGC cylinder 1 through the servo valve 2. The oil in the upper chamber of the AGC enters the T port of the servo valve 2 through the A port of the servo valve 2 and directly returns to the oil tank. The AGC cylinder moves upward, the roll gap is closed, and rolling is carried out. We added a quick lifting circuit to the original circuit, added the pressure reducing valve 5 (RP10), the second one-way valve 6 (CRF4B), the manual lifting valve 7 (D5.2), the quick lifting valve 9 (D8.7), the accumulator 10 (VX1 and VY1), and the overflow valve 8 (LP5.6); when a belt break occurs Or when the system is powered off, the quick lift valve 9 (D8.7) loses power, the valve core moves to the right position, and the oil stored in the accumulator 10 enters the upper chamber of the oil cylinder 1 of the AGC through the quick lift valve 9 (D8.7), while the oil in the lower chamber of the oil cylinder 1 of the AGC also returns to the oil tank through another quick lift valve 9 (D8.7), and the oil cylinder 1 of the AGC is quickly lifted; the volume of the accumulator 10 is 20L, which is much larger than the volume of the AGC oil cylinder 1 of 2.1L. The volume of the two AGC cylinders is 4.2L. The diameter of the quick lift valve 9 (D8.7) is also much larger than the diameter of the servo. In order to achieve higher To control the accuracy, the normal flow rate of the servo valve 2 is 38L / MIN; and the flow rate of the quick lifting valve 9 (D8.7) can reach 300L / MIN. In addition, the system adds the second check valve 6 (CRF4B) after the pressure reducing valve 5 (RP10) to prevent the oil in the accumulator 10 from flowing to other positions during quick lifting or power failure; the system adds the two-way relief valve 8 (LP5.6) to protect the AGC cylinder. When the equipment is abnormal, if the pressure of the AGC steel exceeds the set pressure of the relief valve 8, the relief valve 8 will unload and release excess hydraulic oil to the tank to protect the equipment.
[0021] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.
Claims
1. A hydraulic system for quickly opening the roll gap of a twenty-high rolling mill. It is characterized in that The utility model comprises an oil cylinder, a servo valve, an introduction component and an auxiliary component. The servo valve is connected to the oil cylinder, the introduction component is connected to the servo valve, and the auxiliary component is connected to the servo valve.
2. The twenty-high mill roll gap rapid opening hydraulic system according to claim 1, It is characterized in that The introduction component includes a high-pressure ball valve and a first one-way valve, wherein the first one-way valve is connected to the servo valve; and the high-pressure ball valve is connected to the first one-way valve.
3. The twenty-high mill roll gap rapid opening hydraulic system as claimed in claim 2, It is characterized in that The auxiliary component includes a pressure reducing valve, a second one-way valve, a connecting component and a control component, the pressure reducing valve is connected to the first one-way valve; the second one-way valve is connected to the pressure reducing valve; the connecting component is connected to the pressure reducing valve; and the control component is connected to the second one-way valve.
4. The twenty-high mill roll gap rapid opening hydraulic system as claimed in claim 3, It is characterized in that The connecting component comprises a manual lifting valve and a relief valve. The manual lifting valve is connected to the pressure reducing valve and to the oil cylinder; the relief valve is connected to the servo valve and to the manual lifting valve.
5. The twenty-high mill roll gap rapid opening hydraulic system as claimed in claim 4, It is characterized in that The control component includes a quick lifting valve and an accumulator. Two quick lifting valves are provided. One quick lifting valve is respectively connected to the second one-way valve and the servo valve, and the other quick lifting valve is respectively connected to the manual lifting valve and the cylinder; the accumulator is connected to the other quick lifting valve.