Manual roll changing device and roll changing method for two-roller rolling mill

Abstract

A manual roll changing device and roll changing method for a two-roll rolling mill, comprising a roll changing frame, a lifting device, and a spiral rotating push-pull device, wherein the lifting device is installed on the roll changing frame, a portion of the running track of the lifting device extends out of the roll changing frame, and the threaded rod of the spiral rotating push-pull device is connected to the roll changing frame by a thread. Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention is a purely manual mechanical roll changing device, no crane is required in the process of pushing and pulling the rolls, and no live equipment such as electric and large hydraulic facilities is required, the operation safety factor is high, the equipment is light in weight, the floor space is small, the structure is simple and easy to operate, the maintenance cost and the equipment failure rate are very low, the roll changing efficiency is basically equivalent to the roll changing efficiency of the automatic roll changing vehicle, and no large amount of manpower is required, and the roll changing operation can be completed by two staff members.

Description

Technical Field

[0001] The invention relates to a rolling mill roll changing vehicle, in particular to a manual roll changing device and roll changing method for a two-roll rolling mill. Background Art

[0002] The two-roll mill is mainly used as a rolling experimental equipment for low-carbon steel and non-ferrous metal plates, and is widely used in various laboratories to research and develop rolling processes and the performance of rolled products. During the rolling process, the surface of the roll will inevitably wear and tear, and serious defects such as roll surface scratches, roll surface cracks and roll surface marks will occur. New rolling rolls need to be replaced in time to avoid affecting the quality of the rolled slab.

[0003] There are two common ways to replace rolls in a two-roll mill: the first is to rely on a crane and manpower to replace the rolls; the second is to use a special automatic roll changing vehicle, which mainly includes motor-driven and hydraulic-driven roll changing devices. The first roll changing method completely relies on crane and manpower. When changing rolls, you need to first use a crane to lift the roll surface of the lower roll. The crane slowly drives the upper and lower rolls to move gradually until the small wheel of the lower roll is placed on the I-beam temporarily built outside the rolling mill frame, and then use manpower to pull the roll out from the rolling mill frame. In order to prevent the roll from tilting and collapsing and causing a safety accident, the crane needs to always lift the lower roll during the process of pulling out the old roll and loading the new roll, and as the roll moves, the crane needs to frequently change the lifting position, which requires the crane to perform repeated lifting and lowering and slow hook operations. When the crane falls, there is no constraint on both sides of the roll, and the roll is very easy to tilt and fall. Therefore, this roll changing method is very dangerous to operate, and the roll changing efficiency is very low when manpower is used to push and pull the roll. It takes at least 5-6 hours to change a roll, and at least three people are required to change a roll, and the labor cost is also high. The second roll changing method uses automatic roll changing. Although the roll changing speed is faster and most of the manpower costs are saved, the use of electric or hydraulic automatic roll changing drive makes the equipment structure complicated, resulting in a larger equipment size, and the manufacturing cost and subsequent maintenance and repair costs are also very high. Summary of the invention

[0004] The purpose of the present invention is to provide a manual roll changing device and roll changing method for a two-roll rolling mill. In view of the defects of the original roll changing method, the present invention provides a manual roll changing device and roll changing method for a two-roll rolling mill which are safe to operate, have high roll changing efficiency, low cost and convenient maintenance.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A manual roll changing device for a two-roll rolling mill comprises a roll changing frame, a lifting device, and a spiral rotating push-pull device. The lifting device is installed on the roll changing frame, a portion of the running track of the lifting device extends out of the roll changing frame, and the threaded rod of the spiral rotating push-pull device is connected to the roll changing frame by threads.

[0007] The roller changing frame includes a vertical bracket, a supporting chassis, wheels, supporting feet, and a mounting plate. The wheels and supporting feet are installed at the bottom of the supporting chassis. The vertical bracket is symmetrically installed on both sides of the upper end of the supporting chassis. The mounting plate is installed on one end of the vertical bracket by assembling long holes and bolts. The installation position of the mounting plate on the vertical bracket is on the opposite side of the running track extending out of the roller changing frame. The mounting plate is connected to the threaded rod by threads.

[0008] A side guide slide plate is installed on the inner wall of the vertical bracket, a connecting plate is fixed on one end of the vertical bracket, and the connecting plate is installed on the vertical bracket at a side where the running track extends out of the roller-changing frame.

[0009] An elongated countersunk hole is arranged on the side guide slide plate, and the side guide slide plate is mounted on the vertical bracket through a countersunk bolt.

[0010] The supporting foot comprises a horizontal rod and a vertical rod, the vertical rod is connected to the horizontal rod through a thread, and the horizontal rod is rotatably connected to the supporting chassis.

[0011] The lifting device includes a running track, side guide wheels, a jack, and a lifting frame. The jack is installed at one end of the supporting chassis of the roll changing frame, one end of the running track is fixed on the lifting frame, the jack is top-connected with the lifting frame, and side guide wheels are arranged on the outer side of the running track. The side guide wheels are embedded in the slideway on the vertical bracket of the roll changing frame.

[0012] The spiral rotation push-pull device includes a push-pull head, a threaded rod, a handle, and a pin. A sleeve is provided at one end of the threaded rod. The threaded rod and the sleeve are connected by a bearing. The push-pull head and the sleeve are connected by a pin. The handle is fixed to the other end of the threaded rod.

[0013] A roll changing method using a manual roll changing device of a two-roll rolling mill, the specific method is as follows:

[0014] 1) Release the upper roll balance, let the upper roll fall onto the lower roll, and remove the upper roll balance, coupling and roll baffle;

[0015] 2) Install the push-pull head and the lower roller bearing end cover together;

[0016] 3) Move the roll changing device so that the two vertical supports are against the rolling mill frame arch, insert the running track under the lower roll trolley, and adjust the position of the side guide slide to make the side guide slide parallel to the position of the slide inside the rolling mill frame arch;

[0017] 4) Fix the connecting plate to the rolling mill frame arch;

[0018] 5) Adjust the height of the supporting feet so that the vertical rods are pressed against the ground to support the roller changing frame;

[0019] 6) Use the jack to lift the running track and drive the rollers to rise at the same time until the lower end surface of the lower roller just leaves the lower crossbeam of the rolling mill frame;

[0020] 7) Connect the push-pull head and the threaded rod with a pin shaft, retract the threaded rod by turning the handle, and slowly pull the roll out of the rolling mill frame into the roll changing frame;

[0021] 8) Pull out the pin and continue to turn the handle to separate the push-pull head and the threaded rod;

[0022] 9) The jack releases pressure, and the running track drives the rollers to fall onto the supporting chassis;

[0023] 10) Lift out the upper and lower rollers one by one, remove the push-pull head and install it on the new roller, and use a crane to lift the new rollers into the roller changing frame one by one;

[0024] 11) The running rail and the new roller are simultaneously raised to the position height of step 6) by the jack;

[0025] 12) Turn the handle to connect the threaded rod to the push-pull head and insert the pin;

[0026] 13) Continue to turn the handle to slowly push the roll from the roll changing frame into the rolling mill frame;

[0027] 14) Pull out the pin and turn the handle to separate the push-pull head and the threaded rod;

[0028] 15) Release the pressure on the jack, so that the running track drives the roller to fall onto the supporting chassis;

[0029] 16) Loosen the connecting plate fixed to the rolling mill frame arch.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention is a purely manual mechanical roll changing device. No crane is required in the process of pushing and pulling the rolling rolls, and there is no live equipment such as electric and large hydraulic facilities. The operating safety factor is high, the equipment is light, occupies a small area, has a simple and easy-to-control structure, and the maintenance cost and equipment failure rate are very low. The roll changing efficiency is basically equivalent to that of an automatic roll changing vehicle, and no large amount of manpower is required. The roll changing operation can be completed by two workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a roll changing device;

[0033] Figure 2 It is a schematic diagram of the structure of the long countersunk hole of the side guide slide plate;

[0034] Figure 3 It is a schematic diagram of the lifting device structure;

[0035] Figure 4 It is a schematic diagram of the structure of the spiral rotating push-pull device.

[0036] In the figure: 1-vertical bracket, 1-1 side guide slide plate, 1-1-1 long countersunk hole, 1-1-2 countersunk bolt, 1-2 connecting plate, 2-support chassis, 3-wheel, 4-support foot, 4-1 horizontal rod, 4-2 vertical rod, 5-1 hydraulic jack, 5-2 telescopic spring, 5-3 pedal, 5-4 running track, 5-5 side guide wheel, 5-6 lifting frame, 6-spiral rotation push-pull device, 6-1 push-pull head, 6-2 threaded rod, 6-3 handle, 6-4 pin shaft, 7-mounting plate. DETAILED DESCRIPTION

[0037] The present invention is described in detail below, but the implementation scope of the present invention is not limited to the following embodiments.

[0038] like Figure 1-Figure 4 As shown, a manual roll changing device for a two-roll rolling mill includes a roll changing frame, a lifting device, and a spiral rotating push-pull device 6. The lifting device is installed on the roll changing frame, and a portion of the running track 5-4 of the lifting device extends out of the roll changing frame. The threaded rod 6-2 of the spiral rotating push-pull device 6 is connected to the roll changing frame by threads.

[0039] The roller changing frame includes a vertical bracket 1, a supporting chassis 2, wheels 3, supporting feet 4, and a mounting plate 7. The wheels 3 and supporting feet 4 are mounted at the bottom of the supporting chassis 2. The vertical bracket 1 is symmetrically mounted on both sides of the upper end of the supporting chassis 2. The mounting plate 7 is mounted on one end of the vertical bracket 1 by assembling long holes and bolts. The mounting position of the mounting plate 7 on the vertical bracket 1 is on the opposite side of the running track 5-4 extending out of the roller changing frame. The mounting plate 7 is connected to the threaded rod 6-2 by threads. The mounting plate 7 can achieve a small range of height adjustment in the vertical direction.

[0040] A side guide slide plate 1-1 is installed on the inner wall of the vertical bracket 1, and a connecting plate 1-2 is fixed on one end of the vertical bracket 1. The connecting plate 1-2 is installed on the vertical bracket 1 at a side where the running track 5-4 extends out of the roller changing frame.

[0041] When changing rolls, the connecting plate 1-2 is bolted to the roll baffle position of the original frame arch to fix the roll changing device to avoid slippage and tipping during the roll changing process.

[0042] See Figure 2 An elongated countersunk hole 1-1-1 is provided on the side guide slide 1-1, and the side guide slide 1-1 is mounted on the vertical bracket 1 through a countersunk bolt 1-1-2.

[0043] The side guide slide plate 1-1 is provided with a long countersunk hole 1-1-1, so that it can realize a small range of parallel movement in the vertical direction. It is installed on the inner side of the vertical support 1 with a hexagon socket bolt. The fixing position can be determined according to the position height of the roll when changing the roll.

[0044] The support foot 4 includes a horizontal rod 4 - 1 and a vertical rod 4 - 2 . The vertical rod 4 - 2 is connected to the horizontal rod 4 - 1 through a thread, and the horizontal rod 4 - 1 is rotatably connected to the support chassis 2 .

[0045] The horizontal rod 4-1 can be connected to the bottom of the supporting chassis 2 through an axis, and the supporting foot 4 can rotate around the axis at the bottom of the supporting chassis 2. When changing the rollers, the supporting foot 4 can be rotated out from under the supporting chassis 2 to a suitable supporting position. When the roller changing is completed, the supporting foot 4 can be simultaneously retracted to under the supporting chassis 2 for easy storage.

[0046] The vertical rod 4-2 is threadedly connected to the horizontal rod 4-1. The outer surface of the vertical rod 4-2 is made into a hexagonal foot shape. When changing the roller, use a wrench to rotate the vertical rod 4-2 until all the vertical rods 4-2 are pressed against the ground to ensure the stability of the roller changing device. After the roller changing is completed, use a wrench to rotate the vertical rod 4-2 to its original position.

[0047] Two vertical brackets 1 are symmetrically installed on the supporting chassis 2, four side guide slides 1-1 are symmetrically installed on the inner sides of the two vertical brackets 1, four connecting plates 1-2 are installed on the front end surfaces of the two vertical brackets 1, and four wheels 3 and four supporting feet 4 are symmetrically installed below the supporting chassis 2.

[0048] The lifting device includes a running track 5-4, a side guide wheel 5-5, a jack, and a lifting frame 5-6. The jack is installed at one end of the roller changing frame supporting chassis 2, one end of the running track 5-4 is fixed on the lifting frame 5-6, the jack is top-connected with the lifting frame 5-6, and a side guide wheel 5-5 is arranged on the outer side of the running track 5-4. The side guide wheel 5-5 is embedded in the slideway on the vertical bracket 1 of the roller changing frame.

[0049] The embodiment of the present invention adopts a hydraulic jack. Since the installation position of the hydraulic jack 5-1 is relatively low, in order to facilitate the foot-driven operation of the hydraulic jack 5-1, the present invention removes the driving handle of the hydraulic jack 5-1, and hinges a pedal 5-3 above the small piston rod of the hydraulic jack 5-1, and installs a telescopic spring 5-2 on the small piston rod. When the pedal 5-3 is stepped on to lift the hydraulic jack 5-1, the pedal 5-3 can automatically return to its original position under the action of the telescopic spring 5-2.

[0050] There are four side guide wheels 5-5, which are symmetrically installed on the outside of the running track 5-4. When the jacking device is raised or lowered, the side guide wheels 5-5 roll up and down on the inner side of the slideway on the vertical bracket 1 to ensure the stability of the jacking device during the roller changing process.

[0051] The spiral rotating push-pull device 6 includes a push-pull head 6-1, a threaded rod 6-2, a handle 6-3, and a pin 6-4. A sleeve is provided at one end of the threaded rod 6-2, and the threaded rod 6-2 and the sleeve are connected by a bearing. The push-pull head 6-1 is connected to the sleeve by a pin 6-4, and the handle 6-3 is fixed to the other end of the threaded rod 6-2.

[0052] The push-pull head 6-1 is provided with bolt holes for connecting with the roller bearing end cover, which can realize quick disassembly. Before changing the roller, the push-pull head 6-1 is first installed on the lower roller bearing end cover. The size of the push-pull head 6-1 used can be determined according to the size of the roller bearing end cover.

[0053] A bearing is assembled inside the front end of the threaded rod 6-2 to achieve relative rotation.

[0054] The threaded rod 6-2 and the mounting plate 7 at the rear end of the roll changing frame are matched with right-handed threads. When changing rolls, by shaking the handle 6-3 forwards and backwards, the push-pull rod 6-1 can be spirally rotated to drive the rolls to move forward and backward. This method prevents workers from directly contacting the rolls during the roll changing process, effectively preventing the occurrence of safety accidents.

[0055] A roll changing method using a manual roll changing device of a two-roll rolling mill, the specific method is as follows:

[0056] 1) Release the upper roll balance, let the upper roll fall onto the lower roll, and remove the upper roll balance, coupling and roll baffle;

[0057] 2) Install the push-pull head 6-1 in conjunction with the lower roller bearing end cover;

[0058] 3) Move the roll changing device so that the two vertical supports 1 are against the rolling mill frame arch, the running track 5-4 is inserted under the lower roll trolley, and the position of the side guide slide 1-1 is adjusted so that the side guide slide 1-1 is parallel to the position of the slide inside the rolling mill frame arch;

[0059] 4) Fix the connecting plate 1-2 to the rolling mill frame arch;

[0060] 5) Adjust the height of the supporting foot 4 so that the vertical rod 4-2 is pressed against the ground to support the roller changing frame;

[0061] Rotate the support foot 4 from under the support chassis 2 to a suitable position, and use a wrench to rotate the vertical rod 4-2 until the vertical rod 4-2 is completely pressed against the ground to ensure the stability of the roll changing device during the roll changing process and avoid accidental tipping.

[0062] 6) Slowly step on the pedal 5-3 to make the hydraulic jack lift the running track 5-4 and drive the rollers to rise at the same time until the lower end surface of the lower roller just leaves the lower crossbeam of the rolling mill frame;

[0063] 7) Connect the push-pull head 6-1 and the threaded rod 6-2 with the pin 6-4, retract the threaded rod 6-2 by turning the handle 6-3, and slowly pull the roll out of the rolling mill frame into the roll changing frame;

[0064] 8) Pull out the pin 6-4 and continue to turn the handle 6-3 to separate the push-pull head 6-1 and the threaded rod 6-2;

[0065] 9) The hydraulic jack 5-1 releases pressure, and the running track 5-4 drives the roller to fall onto the supporting chassis 2;

[0066] 10) Lift out the upper and lower rollers one by one, remove the push-pull head 6-1 and install it on the new rollers, and use a crane to lift the new rollers into the roller changing frame one by one;

[0067] 11) Slowly step on the pedal 5-3 to make the hydraulic jack 5-1 drive the running rail 5-4 and the new roller to rise to the position height of step 6);

[0068] 12) Turn the handle 6-3 clockwise to connect the threaded rod 6-2 to the push-pull head 6-1 and insert the pin 6-4;

[0069] 13) Continue to turn the handle 6-3 clockwise to slowly push the roll from the roll changing frame into the rolling mill frame;

[0070] 14) Pull out the pin 6-4 and turn the handle 6-3 counterclockwise to separate the push-pull head 6-1 and the threaded rod 6-2;

[0071] 15) Release the pressure from the hydraulic jack 5-1, so that the running track 5-4 drives the rollers to fall onto the supporting chassis 2;

[0072] 16) Loosen the connecting plate 1-2 fixed to the rolling mill frame arch;

[0073] 17) Use a wrench to reset the four supporting feet 4 and retract them under the supporting base 2, push the roll changing device back to the storage position, and remove the push-pull head 6-1 connected to the lower rolling roller. The roll changing is now completed.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A two-roll mill manual roll changing method, characterized in that: The adopted roller changing device comprises a roller changing frame, a lifting device, and a spiral rotating push-pull device. The lifting device is installed on the roller changing frame, a portion of the running track of the lifting device extends out of the roller changing frame, and the threaded rod of the spiral rotating push-pull device is connected to the roller changing frame by threads; The specific method is as follows: 1) Release the upper roll balance, let the upper roll fall onto the lower roll, and remove the upper roll balance, coupling and roll baffle; 2) Install the push-pull head and the lower roller bearing end cover together; 3) Move the roll changing device so that the two vertical supports are against the mill frame arch, the running rail is inserted under the lower roll trolley, and the position of the side guide slide is adjusted so that the side guide slide is parallel to the inner slide of the mill frame arch; 4) Fix the connecting plate to the rolling mill frame arch; 5) Adjust the height of the supporting feet so that the vertical rods are pressed against the ground to stably support the roller changing frame; 6) Use the jack to lift the running track to drive the upper and lower rollers to rise at the same time until the lower end surface of the lower roller just leaves the lower crossbeam of the rolling mill frame; 7) Connect the push-pull head and the threaded rod with a pin shaft, retract the threaded rod by turning the handle, and slowly pull the upper and lower rolls out of the rolling mill frame into the roll changing frame; 8) Pull out the pin and continue to turn the handle to separate the push-pull head and the threaded rod; 9) The jack releases pressure, and the running track drives the upper and lower rollers to fall onto the supporting chassis; 10) Lift out the upper and lower rolls one by one, remove the push-pull head and install it on the new rolls, and use a crane to lift the new rolls into the roll-changing frame one by one; 11) Use the jack to drive the running rail and the new roller to rise to the position height of step 6); 12) Turn the handle to connect the threaded rod to the push-pull head and insert the pin; 13) Continue to turn the handle to slowly push the new roll from the roll changing frame into the rolling mill frame; 14) Pull out the pin and turn the handle to separate the push-pull head and the threaded rod; 15) Release the pressure on the jack so that the running track drives the new roller to fall onto the supporting chassis; 16) Loosen the connecting plate fixed to the rolling mill frame arch.

2. A two-roll mill manual roll changing method according to claim 1, characterized in that: The roller changing frame includes a vertical bracket, a supporting chassis, wheels, supporting feet, and a mounting plate. The wheels and supporting feet are installed at the bottom of the supporting chassis. The vertical bracket is symmetrically installed on both sides of the upper end of the supporting chassis. The mounting plate is installed on one end of the vertical bracket by assembling long holes and bolts. The installation position of the mounting plate on the vertical bracket is on the opposite side of the running track extending out of the roller changing frame. The mounting plate is connected to the threaded rod by threads.

3. A two-roll mill manual roll changing method according to claim 2, characterized in that: A side guide slide plate is installed on the inner wall of the vertical bracket, a connecting plate is fixed on one end of the vertical bracket, and the connecting plate is installed on the vertical bracket at a side where the running track extends out of the roller-changing frame.

4. A two-roll mill manual roll changing method according to claim 3, characterized in that: An elongated countersunk hole is arranged on the side guide slide plate, and the side guide slide plate is mounted on the vertical bracket through a countersunk bolt.

5. A two-roll mill manual roll changing method according to claim 2, characterized in that: The supporting foot comprises a horizontal rod and a vertical rod, the vertical rod is connected to the horizontal rod through a thread, and the horizontal rod is rotatably connected to the supporting chassis.

6. A two-roll mill manual roll changing method according to claim 1, characterized in that: The lifting device includes a running track, side guide wheels, a jack, and a lifting frame. The jack is installed at one end of the supporting chassis of the roll changing frame, one end of the running track is fixed on the lifting frame, the jack is top-connected with the lifting frame, and side guide wheels are arranged on the outer side of the running track. The side guide wheels are embedded in the slideway on the vertical bracket of the roll changing frame.

7. A two-roll mill manual roll changing method according to claim 1, characterized in that: The spiral rotation push-pull device includes a push-pull head, a threaded rod, a handle, and a pin. A sleeve is provided at one end of the threaded rod. The threaded rod and the sleeve are connected by a bearing. The push-pull head and the sleeve are connected by a pin. The handle is fixed to the other end of the threaded rod.

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