Hydraulic locking device and method for rolling mill roll shaft capable of automatically compensating locking force

Abstract

The invention discloses a rolling mill roll shaft hydraulic locking device capable of automatically compensating locking force. The rolling mill roll shaft hydraulic locking device comprises a roll end shaft sleeve, a hydraulic system, a locking assembly and a side face assembly. The locking assembly is arranged in a shell of the roller end shaft sleeve, the side face assembly is connected with the end face of the roller end shaft sleeve, and the hydraulic system is communicated with the locking assembly. Wherein the locking assembly comprises two locking units which are symmetrically arranged up and down, and each locking unit comprises two axial moving units and a radial moving unit; a shell of the roller end shaft sleeve is provided with two plunger holes in the axial direction, and an axial moving unit is arranged in each plunger hole. A base plate groove is formed in the inner wall of the roller end shaft sleeve; a through groove is formed in each of the front and rear ends of the base plate groove; and a radial moving unit is arranged in the base plate groove and the through groove. The hydraulic locking device can quickly lock and release the roll shaft of the rolling mill, has the functions of automatically compensating pressure loss of a hydraulic system and locking an interface transmission gap, and improves the roll shaft locking performance and the roll changing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of transmission of rolling mill roller shafts, in particular to a hydraulic device for quickly locking and releasing a flat head of a rolling mill roller, which has the functions of compensating for pressure loss of a hydraulic system and locking the transmission clearance of an interface. Background Art

[0002] Continuous casting and rolling of thin strip steel (CSP) is a cutting-edge technology in the metallurgical industry. It has the advantages of reliable rolling accuracy, good balance, high transmission efficiency, low energy consumption, and strong load-bearing capacity. The stability of the CSP rolling process puts forward higher performance requirements on the transmission quality of the rolling mill rollers.

[0003] The transmission quality of the rolling mill roll shaft is closely related to the locking state of the roll shaft flat head. Most of the existing technologies are mechanical locking mechanisms: the roll shaft flat head is interference-mounted in the roller end sleeve of the coupling and the roll shaft flat head is fixed in the roller end sleeve by tightening bolts. Since the roll shaft often vibrates during operation, the wear problem of the roll shaft flat head is serious, so that the roll shaft flat head cannot be effectively locked, inducing more serious roll shaft vibration. When the vibration is serious, the fastening bolts of the roll shaft flat head loosen or even break, and the roll end sleeve cracks, causing equipment shutdown, thereby affecting the rolling accuracy and efficiency, and the normal production of the rolling line is affected. In addition, the steel rolling production line generally needs to change rolls frequently. The mechanical device with bolt locking needs to remove all bolts and then withdraw the roll shaft when changing rolls. The roll changing efficiency is low, and the roll shaft centering is easily affected by the tightening state of each bolt. Therefore, it is urgent to optimize the locking structure of the roll shaft flat head, improve the locking performance of the roll shaft, and improve production efficiency and work reliability to meet the needs of the metallurgical industry.

[0004] Patent CN105195517A achieves quick assembly and disassembly of the roller sleeve by adding a set of slider locking mechanisms through tightening bolts. This patent does not take into account the loosening of bolts caused by roller vibration, and fails to fundamentally solve the loosening of rollers induced by loose bolts. Patent CN203356208U comprehensively utilizes the advantages of interference fit, retaining spring connection and bolt connection to improve the positioning accuracy of the roller sleeve and the roller flat head. Since the roller sleeve and the roller flat head adopt an interference fit, when changing the roller on site, the roller sleeve must be heated before the roller flat head can be installed and disassembled, which will undoubtedly increase the roller changing time and aggravate the wear of the roller end flat head when changing the roller. Patent CN117419081A discloses a hydraulic locker, which has the following disadvantages: first, the clamping and releasing of the shaft is achieved by left and right oil inlet. When a hydraulic failure causes the oil pressure to drop, it cannot automatically compensate for the hydraulic loss; second, it clamps the circular shaft and cannot be directly applied to the clamping of the flat shaft. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a hydraulic locking device for a rolling mill roll shaft that automatically compensates for the locking force, which can quickly lock and release the rolling mill roll shaft, and has the functions of automatically compensating for the loss of pressure in the hydraulic system and the transmission clearance of the locking interface, thereby improving the roll shaft locking performance and roll changing efficiency, and meeting the performance requirements of metallurgical transmission equipment. At the same time, the present invention also provides a locking method for the hydraulic locking device.

[0006] The present invention discloses a hydraulic locking device for a rolling mill roller shaft that automatically compensates for locking force, which comprises a roller end sleeve, a hydraulic system, a locking assembly, and a side assembly; the locking assembly is arranged in a housing of the roller end sleeve, the side assembly is connected to the end face of the roller end sleeve, and the hydraulic system is connected to the locking assembly.

[0007] Furthermore, the locking assembly includes two locking units symmetrically arranged in the upper and lower parts, each locking unit includes two axially movable units and one radially movable unit; the shell of the roller end sleeve is axially provided with two plunger holes symmetrically arranged in the front and rear parts, the plunger holes are blind holes, and an axially movable unit is arranged in each plunger hole; the inner wall of the roller end sleeve is provided with a pad groove, and a through groove is respectively opened at the front and rear ends of the pad groove, and the front and rear through grooves are respectively connected with the front and rear plunger holes; a radially movable unit is arranged in the pad groove and the through groove, and the radially movable unit is connected to the two axially movable units.

[0008] Furthermore, each axial movement unit includes a return spring, a locking plunger, an energy storage plunger, and an energy storage spring; the energy storage spring is arranged at the bottom of the plunger hole, the return spring is arranged at the opening of the plunger hole, the bottom of the energy storage plunger contacts the energy storage spring, the bottom of the locking plunger contacts the return spring, the locking plunger contacts the energy storage plunger plane and there is a gap between the tops of the two to form a plunger oil chamber.

[0009] Furthermore, the contact surface between the locking plunger and the energy storage plunger is a rectangular horizontal plane; and the initial clearance of the plunger oil chamber is 4 to 12 mm.

[0010] Furthermore, each radial movement unit includes a pad, two locking sliders, and at least one double-hook spring; a locking slider is arranged in each through groove, the locking slider contacts the inclined surface of the locking plunger, and the pad is connected to the two locking sliders; the two ends of the double-hook spring are respectively connected to the pad groove and the pad.

[0011] Furthermore, the inclination angle of the contact inclined surface between the locking plunger and the locking slider is 10° to 30°, and the relative sliding displacement between the two inclined surfaces is 9 to 57 mm.

[0012] Furthermore, one end of the double hook spring is connected to the hook hole on the pad, and the other end is connected to the hook hole on the pad groove; the gap between the pad and the pad groove is 10 to 20 mm, and the radial locking displacement of the locking slider and the pad is 5 to 10 mm.

[0013] Furthermore, the side assembly includes screws, gaskets, end covers, and an oil distribution plate; the end cover is pressed tightly on one end of the roller end sleeve and compresses the return spring, and is connected to the roller end sleeve through screws and gaskets.

[0014] Furthermore, the hydraulic system includes an oil distribution plate, a filter, a hydraulic pump, a relief valve, two oil circuits, and two control units, each control unit including a one-way valve, an electromagnetic three-position two-way reversing valve, and a pressure relay; the oil distribution plate is sleeved on the outer circle of the other end of the roller end sleeve, an oil distribution groove is arranged in the middle of the inner hole of the oil distribution plate, and sealing grooves are arranged at both ends, one end of the oil circuit is connected with two plunger oil chambers in the same locking unit through two branches, and the other end opens at the outer wall of the roller end sleeve as an oil inlet; the oil suction port of the hydraulic pump is connected to the oil tank through the filter, and the lubricating oil at the oil outlet reaches the plunger oil chamber through the oil distribution groove, the oil inlet, the one-way valve, and the electromagnetic three-position two-way reversing valve; the pressure relay controls the working position of the reversing valve, and the relief valve determines and controls the pressure of the oil chamber.

[0015] The present invention discloses a locking method for a hydraulic locking device for a rolling mill roll shaft with automatic compensation locking force: 1. Installing the rolling mill roll: installing a new rolling mill roll, with its flat head located in the inner cavity of the roll end sleeve and facing the pad, the return spring being axially limited, the two pairs of kinematic pairs consisting of the energy storage plunger, the locking plunger and the locking plunger, and the locking slide block being in the initial contact position, and the flat head of the rolling mill roll shaft being in the released state; 2. Quick locking: the pressure relay sends a signal, the reversing valve is in the left position, and the hydraulic pump outlet oil enters the hydraulic pump outlet; The high-pressure oil enters the plunger oil chamber, and the locking plunger and the energy storage plunger move axially to the left and right respectively. The locking plunger pushes the locking slider and the pad to move radially toward the center of the roller end sleeve. When the pad contacts the flat head of the mill roller shaft, the pressure in the plunger oil chamber begins to increase, pushing the pad to squeeze the flat head of the mill roller shaft. When the plunger oil chamber pressure exceeds the set pressure of the relief valve, the relief valve begins to overflow to stabilize the oil chamber pressure, and the pad reaches the maximum locking position on the flat head of the mill roller shaft. Operation mode: the pressure relay sends a signal, the reversing valve is in the middle position, the hydraulic system enters the pressure-maintaining state, the locking plunger and the energy-storage plunger no longer move, the rollers are kept locked, and the rollers enter the rolling operation mode; 4. Quick release: the pressure relay sends a signal, the reversing valve is in the right position, the oil at the hydraulic pump outlet flows into the oil tank, the oil in the plunger oil chamber is connected to the oil tank, the oil pressure in the plunger oil chamber is zero, and the reset spring and energy-storage spring make the locking plunger and energy-storage plunger move right and left respectively The double-hook spring retracts and resets, pulling the pad and the locking slider away from the center of the roll end sleeve and returning to the initial position, so that the pad is separated from the flat head of the mill roll shaft, and the flat head of the mill roll shaft is released; 5. Roll change: remove the old roll from the roll end sleeve, install the new roll, and its flat head is located in the inner cavity of the roll end sleeve, thereby realizing roll change.

[0016] The beneficial effects of the hydraulic locking device of the present invention are as follows: 1. The hydraulic locking device adopts hydraulic oil and a reset spring to realize the locking and releasing functions, and has the characteristics of rapid locking and releasing, thereby improving the locking performance of the rolling mill and the steel rolling production efficiency; 2. The hydraulic locking device has a self-compensation function, which can compensate for the system pressure loss caused by hydraulic system failure and the transmission clearance caused by the wear of the locking interface of the rolling mill flat head, and can effectively maintain the locking state of the rolling mill, which is beneficial to safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic view of the hydraulic locking device of the present invention.

[0018] Figure 2 It is an exploded view of the hydraulic locking device of the present invention.

[0019] Figure 3 It is a left view of the hydraulic locking device of the present invention.

[0020] Figure 4 For along Figure 3 Section view along line AA.

[0021] Figure 5 For along Figure 3 Cross-sectional view along line BB.

[0022] Figure 6 A three-dimensional view of the roller end sleeve.

[0023] Figure 7 It is a three-dimensional diagram of the hydraulic locking mechanism.

[0024] Figure 8 This is an exploded view of the kinematic joint.

[0025] Fig. 9 This is the oil circuit layout diagram of the hydraulic locking device.

[0026] Fig.10 This is the schematic diagram of the hydraulic system of the hydraulic locking device.

[0027] Fig.11 It is a schematic diagram of the status of the roll end flat head in the hydraulic locking device of the rolling mill roll shaft. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5It can be seen that the present invention is a hydraulic locking device for a rolling mill roller shaft that automatically compensates for the locking force, which includes a roller end sleeve 8, a hydraulic system, a locking assembly, and a side assembly; the locking assembly is arranged in the shell of the roller end sleeve 8, the side assembly is connected to the end face of the roller end sleeve 8, and the hydraulic system is connected to the locking assembly.

[0031] The hydraulic locking device of the present invention quickly locks and releases the flat head of the rolling mill roll shaft 16 through the combination of the locking assembly in the roll end sleeve 8 and the hydraulic system, which not only improves the efficiency but also avoids a series of problems caused by loosening and breaking of the locking screws. At the same time, the hydraulic system can automatically compensate, thereby ensuring the locking performance of the roll shaft and meeting the performance requirements of metallurgical transmission equipment.

[0032] Example 2

[0033] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 It can be seen that the hydraulic locking device of the rolling mill roller of the present invention: the locking assembly includes two locking units symmetrically arranged in the upper and lower parts, each locking unit includes two axially movable units and one radially movable unit; the shell of the roller end sleeve 8 is axially provided with two plunger holes 12 symmetrically arranged in the front and rear, the plunger holes 12 are blind holes, and an axially movable unit is arranged in each plunger hole 12; a pad groove 14 is provided on the inner wall of the roller end sleeve 8, and a through groove 13 is respectively opened at the front and rear ends of the pad groove 14, and the front and rear through grooves 13 are respectively connected with the front and rear plunger holes 12; a radially movable unit is arranged in the pad groove 14 and the through groove 13, and the radially movable unit is connected to the two axially movable units.

[0034] The axial moving unit drives the radial moving unit to move through axial movement, thereby realizing rapid locking and releasing of the flat head of the rolling mill roller shaft 16 arranged in the hole of the roller end sleeve 8.

[0035] Example 3

[0036] from Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be known that the hydraulic locking device of the rolling mill roller shaft of the present invention: each axial moving unit includes a reset spring 4, a locking plunger 5, an energy storage plunger 6, and an energy storage spring 7; the energy storage spring 7 is arranged at the bottom of the plunger hole 12, the reset spring 4 is arranged at the orifice of the plunger hole 12, the bottom of the energy storage plunger 6 contacts the energy storage spring 7, the bottom of the locking plunger 5 contacts the reset spring 4, the locking plunger 5 and the energy storage plunger 6 are in plane contact and there is a gap between the tops of the two to form a plunger oil chamber 18.

[0037] The plunger oil chamber 18 is a chamber surrounded by the locking plunger 5, the energy storage plunger 7 and the plunger hole 12, through which lubricating oil is injected or flows out, thereby promoting the left and right axial movement of the locking plunger and the energy storage plunger, and then driving the movement of the radial moving unit, thereby realizing the rapid locking and release of the flat head of the rolling mill roller shaft 16 arranged in the hole of the roller end sleeve 8.

[0038] Example 4

[0039] from Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 It can be seen that in the hydraulic locking device of the rolling mill roll shaft of the present invention: the contact surface between the locking plunger 5 and the energy storage plunger 6 is a rectangular horizontal plane; and the initial gap of the plunger oil chamber 18 is 4 to 12 mm.

[0040] The rectangular contact surface 29 of the energy storage plunger 6 cooperates with the rectangular contact surface 30 of the locking plunger 5 to form a first pair of kinematic pairs, so that the locking plunger 5 and the energy storage plunger 6 can move left and right along the axial direction of the roller end sleeve 8, thereby driving the movement of the radial moving unit, thereby realizing the rapid locking and release of the flat head of the rolling mill roller shaft 16 set in the hole of the roller end sleeve 8.

[0041] Example 5

[0042] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 It can be seen that the hydraulic locking device of the rolling mill roller of the present invention: each radial moving unit includes a pad 9, two locking sliders 10, and at least one double hook spring 17; a locking slider 10 is arranged in each through groove 13, the locking slider 10 is in inclined contact with the locking plunger 5, and the pad 9 is connected to the two locking sliders 10; the two ends of the double hook spring 17 are respectively connected to the pad groove 14 and the pad 9.

[0043] The inclined surface 20 on the locking plunger 5 cooperates with the inclined surface 31 on the locking slider 10 to form a second pair of kinematic pairs, so that the locking slider 10 drives the pad 9 to move radially inward and outward along the roller end sleeve 8: when the high-pressure oil enters the plunger oil chamber 18, it pushes the locking plunger 5 and the energy storage plunger 6 to move axially to the left and right respectively, and the matching inclined surfaces between the locking plunger and the locking slider slide, so that the pad 9 moves radially toward the center of the roller end sleeve 8, thereby realizing rapid locking of the flat head of the rolling mill roller shaft 16; when the hydraulic oil pressure in the plunger oil chamber 18 is zero, the reset spring 4 and the energy storage spring 7 push the locking plunger 5 and the energy storage plunger 6 to move axially to the right and left respectively, and the double-hook spring 17 pulls the pad 9 away from the center of the roller end sleeve 8 for radial movement, thereby realizing rapid release of the flat head of the rolling mill roller shaft 16.

[0044] The locking slide 10 is connected to the backing plate 9 via the bottom plane 32 .

[0045] Example 6

[0046] from Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 It can be seen that in the hydraulic locking device of the rolling mill roll shaft of the present invention, the inclination angle of the contact inclined surface between the locking plunger 5 and the locking slider 10 is 10° to 30°, and the relative sliding displacement between the two inclined surfaces is 9 to 57 mm.

[0047] Due to the large inclination angle of the inclined surface, it has a larger radial retraction displacement and a larger locking force, which is particularly suitable for continuous rolling metallurgical heavy load scenarios.

[0048] Example 7

[0049] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 It can be seen that the hydraulic locking device of the rolling mill roller of the present invention: one end of the double hook spring 17 is connected to the hook hole 33 on the pad 9, and the other end is connected to the hook hole 34 on the pad groove 14; the gap between the pad 9 and the pad groove 14 is 10 to 20 mm, and the radial locking displacement of the locking slider 10 and the pad 9 is 5 to 10 mm.

[0050] The double hook spring 17 ensures the reliability of the outward radial movement of the backing plate 9 and the rapid recovery of the inward radial movement.

[0051] Example 8

[0052] from Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 It can be seen that the hydraulic locking device of the rolling mill roller shaft of the present invention: the side components include screws 1, gaskets 2, end covers 3, and oil distribution plates 11; the end cover 3 is tightly pressed on one end of the roller end sleeve 8 and compresses the return spring 4, and is connected to the roller end sleeve 8 through screws 1 and gaskets 2.

[0053] Wherein: the end cover 3 is fixed to the end of the roller end sleeve 8 by means of fixing screws 1 and gaskets 2, and the return spring 4 is compressed.

[0054] Example 9

[0055] from Figure 2 , Figure 3 , Figure 4 , Figure 5 , Fig. 9 , Fig.10 It can be seen that the hydraulic locking device of the rolling mill roll shaft of the present invention: the hydraulic system includes an oil distribution plate 11, a filter 23, a hydraulic pump 24, a relief valve 25, two oil circuits 15, and two control units, each control unit includes a one-way valve 26, an electromagnetic three-position two-way reversing valve 27, and a pressure relay 28; the oil distribution plate 11 is sleeved on the outer circle of the other end of the roll end sleeve 8, an oil distribution groove 21 is arranged in the middle of the inner hole of the oil distribution plate 11, and sealing grooves 22 are arranged at both ends, one end of the oil circuit 15 is connected with two plunger oil chambers 18 in the same locking unit through two branches, and the other end opens at the outer wall of the roll end sleeve 8 as an oil inlet 19; the oil suction port of the hydraulic pump 24 is connected to the oil tank through the filter 23, and the lubricating oil at the oil outlet reaches the plunger oil chamber 18 through the oil distribution groove 21, the oil inlet 19, the one-way valve 26, and the electromagnetic three-position two-way reversing valve 27; the pressure relay 28 controls the working position of the reversing valve 27, and the relief valve 25 determines and controls the pressure of the oil chamber.

[0056] Among them: the hydraulic system distributes the oil to the oil inlet 19 into the plunger oil chamber 18 through the oil distribution groove 21; the sealing ring installed in the sealing groove 22 can ensure that there is no leakage during the oil distribution process in the oil distribution groove 21; during the oil supply operation, the roller end sleeve rotates with the roller shaft, and the oil distribution plate does not rotate.

[0057] The left position of the electromagnetic three-position two-way reversing valve 27 is used for pressurizing the system and performing the locking action; the middle position is used for maintaining the system pressure and maintaining the locking state; the right position is used for depressurizing the system and performing the release action. The set pressure of the relief valve is 6-30MPa, and the locking pressure of the hydraulic system is 6-30MPa.

[0058] from Fig.10It can be seen that the working principle of the hydraulic system is as follows: when the reversing valve is placed in the left position, the oil at the outlet of the hydraulic pump enters the plunger oil chamber through the oil distribution plate, the one-way valve, and the reversing valve, and the high-pressure oil pushes the locking plunger and the energy storage plunger to extend axially outward to perform a locking action. At the same time, the return spring and the energy storage spring are compressed by the locking plunger and the energy storage plunger respectively; when the pressure in the plunger oil chamber exceeds the set pressure of the relief valve, the relief valve begins to overflow, the pressure relay sends a signal, the reversing valve moves to the middle position, the hydraulic system enters the pressure maintaining state, and maintains the locking state; when the reversing valve is placed in the right position, the oil at the outlet of the hydraulic pump flows into the oil tank, the oil in the plunger oil chamber is connected to the oil tank, the oil pressure in the plunger oil chamber is zero, the oil in the plunger oil chamber flows into the oil tank, the locking plunger and the energy storage plunger retract, and the release action is performed.

[0059] Example 10

[0060] The hydraulic locking method of the rolling mill roll shaft of the present invention: 1. Installing the rolling mill roll: Fig.11As shown, a new roller 16 is installed, and its flat head is located in the inner cavity of the roller end sleeve 8 and faces the pad 9. At this time, the reset spring 4 is axially limited, and the two pairs of kinematic pairs consisting of the energy storage plunger 6, the locking plunger 5 and the locking plunger 5 and the locking slide 10 are in the initial contact position, and the flat head of the rolling mill roller 16 is in a released state; Second, quick locking: the pressure relay 28 sends a signal, the reversing valve 27 is in the left position, the oil at the outlet of the hydraulic pump 24 enters the plunger oil chamber 18, and the high-pressure oil pushes the locking plunger 5 and the energy storage plunger 6 respectively The locking plunger 5 moves axially to the left and right, and pushes the locking slider 10 and the pad 9 to move radially toward the center of the roller end sleeve 8. When the pad 9 contacts the flat head of the rolling mill roller shaft 16, the pressure in the plunger oil chamber 18 begins to increase, pushing the pad 9 to squeeze the flat head of the rolling mill roller shaft 16. When the pressure in the plunger oil chamber 18 exceeds the set pressure of the relief valve 25, the relief valve 25 begins to overflow to stabilize the oil chamber pressure, and the pad 9 reaches the maximum locking position on the flat head of the rolling mill roller shaft 16. 3. Rolling operation: the pressure relay 28 sends a signal The reversing valve 27 is in the middle position, the hydraulic system enters the pressure-maintaining state, the locking plunger 5 and the energy-storage plunger 6 no longer move, the rollers are kept locked, and the rollers enter the rolling operation mode; 4. Quick release: the pressure relay 28 sends a signal, the reversing valve 27 is in the right position, the oil at the outlet of the hydraulic pump 24 flows into the oil tank, the oil in the plunger oil chamber 18 is connected to the oil tank, the oil pressure in the plunger oil chamber 18 is zero, and the reset spring 4 and the energy-storage spring 7 make the locking plunger 5 and the energy-storage plunger 6 move rightward and leftward respectively to return to their initial positions. , the plunger oil chamber is compressed to reduce its volume, and the oil in the plunger oil chamber flows into the oil tank, and the locking slider 9 is no longer subjected to the extrusion force of the locking plunger 5; at the same time, the double-hook spring 17 is retracted and reset, pulling the pad 9 and the locking slider 10 away from the center of the roll end sleeve 8 back to the initial position, so that the pad 9 is separated from the flat head of the rolling mill roll shaft 16, and the flat head of the rolling mill roll shaft 16 is released; 5. Quick roll change: withdraw the old roll 16 from the roll end sleeve 8, install the new roll 16, and its flat head is located in the inner cavity of the roll end sleeve 8, thereby realizing roll change.

[0061] Among them, in the locking process of step 2: when the supplied oil pushes the locking plunger 5 and the energy storage plunger 6 to move axially to the left and right respectively, the reset spring 4 and the energy storage spring 7 are compressed respectively, and at the same time, the pad 9 moves radially toward the center of the roller end sleeve 8, and the double hook spring 17 is stretched; in the release process of step 4: the reset spring 4 and the energy storage spring 7 are reset, pushing the locking plunger 5 and the energy storage plunger 6 to move axially to the middle, and at the same time, the double hook spring 17 is reset, and the pad 9 moves radially away from the center of the roller end sleeve 8; in addition, since the hydraulic locking mechanism needs to ensure the torque transmission during the operation of the roller, the hydraulic locking mechanism is required to provide sufficient locking force. The present invention uses the double hook spring to radially retract the pad and the locking slider, and the pad is separated from the flat head of the roller end, and the release action is automatically completed, with low energy consumption.

[0062] The working principle of the hydraulic locking device of the present invention is: the flat head of the rolling mill roll shaft is locked by a hydraulic system, and oil is supplied to the hydraulic locking device through an oil distribution plate. The supplied high-pressure oil pushes the locking plunger to move axially, and the matching inclined surfaces between the locking plunger and the locking slider produce relative movement, thereby realizing the locking function of the pad on the flat head of the roll end; under the action of the reset spring and the energy storage spring, the locking plunger and the energy storage plunger retract to their original positions, and the oil in the plunger oil chamber flows into the oil tank, and the locking slider is no longer subjected to the extrusion force of the locking plunger. Under the action of the double-hook spring, the pad and the locking slider retract, and the pad is separated from the flat head of the roll end, completing the release action.

[0063] The advantages of the hydraulic locking device of the present invention are: 1. Fast locking and releasing: Through the combination of the hydraulic system and the locking assembly, the roller flat head can be quickly locked and released, which not only improves the efficiency, but also avoids a series of problems caused by the loosening and breaking of the locking screws; 2. Automatic compensation for the loss of pressure in the hydraulic system to ensure reliable locking and prevent locking failure: Due to the complex working conditions of the roller shaft, the hydraulic locking system will inevitably have hydraulic failures such as aging of hydraulic parts and leakage of hydraulic oil during use, which will cause the locking effect of the pad on the roller flat head to deteriorate. When the hydraulic failure causes the oil hydraulic pressure in the plunger oil chamber to When the force decreases, the locking plunger and the energy storage plunger partially return to their original positions under the action of the spring force of the return spring and the energy storage spring, and the plunger oil chamber is squeezed to increase its oil pressure, thereby effectively compensating for the system pressure drop caused by the hydraulic failure, and thus maintaining the locking state of the roller; 3. Automatically compensate for the transmission gap of the locking interface to ensure reliable locking and prevent locking failure: When there is a wear gap between the flat head at the end of the roller and the pad, the locking plunger continues to move outward from the original extended position under the action of the liquid pressure at the bottom of the plunger, further pushing the locking slider and the pad close to the flat head of the roller shaft, compensating for the wear gap, and maintaining the locking state of the roller.

[0064] Therefore, the hydraulic locking device of the rolling mill roll shaft of the present invention can not only quickly lock and release the flat head of the roll shaft, improve the locking performance efficiency and roll changing efficiency, and improve the steel rolling production efficiency; at the same time, it has a self-compensation function for the system pressure loss caused by hydraulic system failure and the transmission clearance caused by the wear of the locking interface, and can effectively maintain the locking state of the roll, which is beneficial to safe production. Of course, according to actual needs, the locking device of the present invention can also include more embodiments within the above scope, and the present invention is not limited to the above specific embodiments.

Claims

1. A hydraulic locking device for a rolling mill roll shaft with automatic compensation locking force, characterized by: It comprises a roller end shaft sleeve (8), a hydraulic system, a locking assembly, and a side assembly; the locking assembly is arranged in a housing of the roller end shaft sleeve (8), the side assembly is connected to the end surface of the roller end shaft sleeve (8), and the hydraulic system is communicated with the locking assembly.

2. The hydraulic locking device according to claim 1, characterized in that: The locking assembly comprises two locking units symmetrically arranged in the upper and lower parts, each locking unit comprises two axial movement units and one radial movement unit; the shell of the roller end shaft sleeve (8) is axially provided with two plunger holes (12) symmetrically arranged in the front and rear parts, the plunger holes (12) are blind holes, and an axial movement unit is arranged in each plunger hole (12); the inner wall of the roller end shaft sleeve (8) is provided with a pad groove (14), and a through groove (13) is respectively provided at the front and rear ends of the pad groove (14), and the front and rear through grooves (13) are respectively connected with the front and rear plunger holes (12); a radial movement unit is arranged in the pad groove (14) and the through groove (13), and the radial movement unit is connected with the two axial movement units.

3. The hydraulic locking device according to claim 1, characterized in that: Each axial movement unit comprises a return spring (4), a locking plunger (5), an energy storage plunger (6), and an energy storage spring (7); the energy storage spring (7) is arranged at the bottom of the plunger hole (12), the return spring (4) is arranged at the opening of the plunger hole (12), the bottom of the energy storage plunger (6) contacts the energy storage spring (7), the bottom of the locking plunger (5) contacts the return spring (4), the locking plunger (5) and the energy storage plunger (6) are in plane contact, and a gap exists between the tops of the two to form a plunger oil chamber (18).

4. The hydraulic locking device according to claim 3 is characterized in that: The contact surface between the locking plunger (5) and the energy storage plunger (6) is a rectangular horizontal surface; the initial clearance of the plunger oil chamber (18) is 4 to 12 mm.

5. The hydraulic locking device according to claim 2, characterized in that: Each radial movement unit comprises a pad (9), two locking sliders (10), and at least one double hook spring (17); a locking slider (10) is arranged in each through groove (13), the locking slider (10) is in inclined contact with the locking plunger (5), and the pad (9) is connected to the two locking sliders (10); the two ends of the double hook spring (17) are respectively connected to the pad groove (14) and the pad (9).

6. The hydraulic locking device according to claim 5, characterized in that: The inclination angle of the contact inclined surface between the locking plunger (5) and the locking slider (10) is 10° to 30°, and the relative sliding displacement between the two inclined surfaces is 9 to 57 mm.

7. The hydraulic locking device according to claim 5, characterized in that: One end of the double hook spring (17) is connected to a hook hole (33) on a backing plate (9), and the other end is connected to a hook hole (34) on a backing plate groove (14); the gap between the backing plate (9) and the backing plate groove (14) is 10 to 20 mm, and the radial locking displacement of the locking slider (10) and the backing plate (9) is 5 to 10 mm.

8. The hydraulic locking device according to claim 1, characterized in that: The side assembly comprises screws (1), gaskets (2), end covers (3), and an oil distribution plate (11); the end cover (3) is pressed tightly onto one end of the roller end shaft sleeve (8) and compresses the return spring (4), and is connected to the roller end shaft sleeve (8) via the screws (1) and gaskets (2).

9. The hydraulic locking device according to claim 1, characterized in that: The hydraulic system comprises an oil distribution plate (11), a filter (23), a hydraulic pump (24), a relief valve (25), two oil circuits (15), and two control units. Each control unit comprises a one-way valve (26), an electromagnetic three-position two-way reversing valve (27), and a pressure relay (28). The oil distribution plate (11) is sleeved on the outer circle of the other end of the roller end shaft sleeve (8). An oil distribution groove (21) is arranged in the middle of the inner hole of the oil distribution plate (11), and sealing grooves (22) are arranged at both ends. One end of the oil circuit (15) is connected to the same roller end shaft sleeve (8) through two branches. Two plunger oil chambers (18) in a locking unit are connected, and the other end opens at the outer wall of the roller end sleeve (8) as an oil inlet (19); the oil suction port of the hydraulic pump (24) is connected to the oil tank through a filter (23), and the lubricating oil at the oil outlet passes through an oil distribution groove (21), an oil inlet (19), a one-way valve (26), and an electromagnetic three-position two-way reversing valve (27) to reach the plunger oil chamber (18); a pressure relay (28) controls the working position of the reversing valve (27), and a relief valve (25) determines and controls the pressure of the oil chamber.

10. A locking method for a hydraulic locking device of a rolling mill roller shaft with automatic compensation locking force, characterized in that:

1. Installing the roll: Install the new roll, its flat head is located in the inner cavity of the roll end sleeve and faces the pad, the reset spring is axially limited, the two pairs of kinematic pairs consisting of the energy storage plunger, locking plunger and locking plunger, and locking slider are in the initial contact position, and the flat head of the mill roll shaft is in the released state; 2. Quick locking: The pressure relay sends a signal, the reversing valve is in the left position, and the oil at the outlet of the hydraulic pump enters the plunger oil chamber. The high-pressure oil pushes the locking plunger and the energy storage plunger to move axially to the left and right respectively, and the locking plunger pushes the locking slider and the pad to move radially toward the center of the roll end sleeve. When the pad contacts the flat head of the mill roll shaft, the pressure in the plunger oil chamber begins to increase, pushing the pad to squeeze the flat head of the mill roll shaft. When the plunger oil chamber pressure exceeds the set pressure of the relief valve, the relief valve begins to overflow to stabilize the oil chamber pressure, and the pad reaches the maximum locking position on the flat head of the mill roll shaft; 3. Rolling operation ... reversing valve is in the left position, and the reversing valve is in the left position, and the reversing The reversing valve is in the middle position, the hydraulic system enters the pressure-maintaining state, the locking plunger and the energy-storage plunger no longer move, the roll is kept in the locked state, and the roll enters the rolling operation mode; 4. Quick release: the pressure relay sends a signal, the reversing valve is in the right position, the oil at the outlet of the hydraulic pump flows into the oil tank, the oil in the plunger oil chamber is connected to the oil tank, the oil pressure in the plunger oil chamber is zero, the reset spring and the energy-storage spring make the locking plunger and the energy-storage plunger move rightward and leftward respectively back to the initial position, the plunger oil chamber is compressed to reduce its volume, the oil in the plunger oil chamber flows into the oil tank, and the locking slider is no longer subjected to the extrusion force of the locking plunger; at the same time, the double-hook spring is retracted and reset, pulling the pad and the locking slider away from the center of the roll end sleeve back to the initial position, so that the pad is separated from the flat head of the mill roll shaft, and the flat head of the mill roll shaft is released; 5. Roll change: withdraw the old roll from the roll end sleeve, install the new roll, and its flat head is located in the inner cavity of the roll end sleeve, thereby realizing roll change.

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