A strip clamping and lifting device for a cold rolling mill

Abstract

This invention aims to provide a strip clamping and lifting device for cold rolling mills to solve the problem of strip slack and sagging during roll changing in cold rolling mills. To achieve the above objective, the technical solution of this invention is as follows: A strip clamping and lifting device for cold rolling mills includes an upper pressure plate and a lower pressure plate that can move vertically. The upper and lower pressure plates are parallel, with the upper pressure plate positioned above the strip and the lower pressure plate positioned below it. When rolling the strip, the upper and lower pressure plates separate, and the strip passes between them. During roll changing, the upper pressure plate moves downward and the lower pressure plate moves upward to clamp the strip. During rolling, the separation of the upper and lower pressure plates facilitates the passage of the strip; during roll changing, the upper and lower pressure plates merge to clamp the strip and lift it to a height matching the roll gap box, ensuring the smooth operation of the automatic roll changing process.

Description

Technical Field

[0001] This invention relates to the field of cold rolling mill technology, and more specifically to a strip clamping and lifting device for a cold rolling mill. Background Technology

[0002] A cold rolling mill is a new type of steel bar cold rolling processing equipment. It mainly uses rolls to press strip steel, and the rolls need to be changed periodically during the production process. To improve the yield, modern cold rolling mills mostly adopt a roll changing method with strip steel, that is, the rolls are pulled out of the stand without cutting the strip steel in the cold rolling mill. Because the gap between the rolls of a cold rolling mill is very small, during the roll pulling process, the strip steel sags due to tension relaxation and is easily rubbed against the rolls during the roll changing process, causing the automatic roll changing process to fail. Summary of the Invention

[0003] The present invention aims to provide a strip clamping and lifting device for cold rolling mills to solve the problem of strip slack and sagging during roll changing in cold rolling mills.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a strip steel clamping and lifting device for a cold rolling mill, comprising an upper pressure plate and a lower pressure plate that can move up and down, and a lifting mechanism for controlling the movement of the upper pressure plate and the lower pressure plate. The upper pressure plate and the lower pressure plate are parallel, with the upper pressure plate positioned above the strip steel and the lower pressure plate positioned below the strip steel. When rolling the strip steel, the upper pressure plate and the lower pressure plate are separated, and the strip steel passes between the upper pressure plate and the lower pressure plate. When changing rolls, the upper pressure plate moves downward and the lower pressure plate moves upward. The upper pressure plate and the lower pressure plate are linked by the lifting mechanism to clamp the strip steel.

[0005] During rolling, the upper and lower pressure plates are separate to facilitate the passage of the strip. When changing rolls, the upper and lower pressure plates merge to clamp the strip and lift it to a height that matches the roll gap box, ensuring the smooth operation of the automatic roll changing process. The upper and lower pressure plates are linked by a lifting mechanism, so only one lifting mechanism is needed to control the movement of both parts, making the device simpler and the control easier.

[0006] In one embodiment, the strip clamping and lifting device further includes a sliding guide rod frame, a lower crossbeam, and a guide groove. The lower pressure plate is fixed on the lower crossbeam, and the lower crossbeam has sliders at both ends. The sliders are slidably disposed in the fixed guide groove. The sliding guide rod frame includes an upper crossbeam, a lower support, and a guide rod. The upper crossbeam is used to fix the upper pressure plate. The two ends of the guide rod are respectively connected to the upper crossbeam and the lower support. The lower support is disposed below the lower crossbeam. The upper end of the guide groove is provided with an upper stop block. The upper crossbeam is disposed above the upper stop block. The lower end of the guide groove is provided with a lower stop block, and the slider is placed on the lower stop block.

[0007] When the lifting mechanism moves, the lower crossbeam and the lower support will move away from each other. Therefore, the lower support, along with the guide rod, the upper crossbeam, and the upper pressure plate, moves downward until the upper crossbeam collides with the upper stop block. The lower crossbeam, along with the lower pressure plate, moves upward until the upper and lower pressure plates clamp the strip steel.

[0008] In one embodiment, the slider is provided with a groove, and the guide rod passes through the groove.

[0009] The slider has a groove that fixes the guide rod, while the guide rod guides the slider.

[0010] In one embodiment, a synchronization device is provided between the slider and the guide rod. The synchronization device is used to make the two sliders rise and fall synchronously, and the synchronization device is also used to make the two guide rods rise and fall synchronously.

[0011] The simultaneous lifting and lowering of the two sliders and two guide rods allows the upper and lower pressure plates to rise and fall synchronously at both ends, ensuring that the upper and lower pressure plates contact the strip steel with a flat surface and fully clamp the strip steel.

[0012] In one embodiment, the lifting mechanism includes a hydraulic cylinder or a pneumatic cylinder and a piston rod. The piston rod is telescopically fixed inside the hydraulic cylinder or pneumatic cylinder. The lower end of the hydraulic cylinder or pneumatic cylinder is fixed to the lower support, and the upper end of the piston rod is fixedly connected to the lower crossbeam.

[0013] Since the sliding guide rail bracket is supported and fixed by the lower stop, lower crossbeam, cylinder or hydraulic cylinder and piston rod, when the piston rod extends, the lower crossbeam and lower bracket move away from each other, the sliding guide rail bracket moves downward, and the upper crossbeam moves downward with the upper pressure plate until the upper crossbeam collides with the upper stop; the piston rod continues to extend, and the lower crossbeam and lower bracket continue to move away from each other. Due to the obstruction of the upper stop, the lower crossbeam moves upward with the lower pressure plate until the upper pressure plate and lower pressure plate clamp the upper and lower surfaces of the strip steel, thereby clamping the strip steel.

[0014] In one embodiment, the lifting mechanism comprises a gear, a first rack, and a second rack. The first rack and the second rack mesh with the gear, and are arranged parallel to each other on both sides of the gear. The upper end of the first rack is fixedly connected to the lower crossbeam, and the lower end of the second rack is fixedly connected to the lower support.

[0015] When the gears rotate, the first rack moves upward, causing the lower crossbeam to move upward along with the lower pressure plate, while the second rack moves downward, causing the upper crossbeam to move downward along with the upper pressure plate, until the upper and lower pressure plates clamp the upper and lower surfaces of the strip steel, thereby holding the strip steel.

[0016] In one embodiment, the lower stop is a step protruding from the lower end of the guide groove.

[0017] The lower stop block is located at the lower end of the guide groove to support the lower crossbeam.

[0018] In one embodiment, the width of the lower pressure plate is not less than the width of the strip steel.

[0019] The width of the pressure plate is not less than the width of the strip, so that the strip can be fully supported and the strip can be prevented from sagging due to tension.

[0020] In one embodiment, the width of the upper pressure plate is not less than the width of the strip steel.

[0021] The wider the upper pressure plate, the more the downward pressure can be distributed across the strip, which reduces wear on the strip and helps to clamp the strip.

[0022] In one embodiment, the strip clamping and lifting device is used to be installed at the roll gap entrance of the cold rolling mill.

[0023] The strip clamping and lifting device is located at the roll gap entrance, which can better lift the strip to a height that matches the roll gap box when changing rolls.

[0024] The present invention has the following beneficial effects: by setting up an upper pressure plate and a lower pressure plate, force is applied from the upper and lower sides of the strip steel respectively, thereby clamping and lifting the strip steel to a height that matches the roll gap box, so as to ensure the smooth operation of the automatic roll changing process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention in the working state of a cold rolling mill.

[0026] Figure 2 This is a schematic diagram of the structure of the present invention in the roll changing state of a cold rolling mill.

[0027] Figure 3 This is a schematic diagram of the operation of the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of another embodiment of the present invention in the working state of a cold rolling mill.

[0029] Figure 5 This is a schematic diagram of another embodiment of the present invention in the roll changing state of a cold rolling mill.

[0030] Figure 6 This is an operational schematic diagram of another embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram showing the relative position of the present invention and the cold rolling mill.

[0032] Figure 8 This is the front view of the present invention.

[0033] The components include: 1 upper pressure plate, 2 lower pressure plate, 3 lower crossbeam, 41 lower support, 42 upper crossbeam, 43 guide rod, 5 guide groove, 51 upper stop block, 52 lower stop block, 6 lifting mechanism, 61 hydraulic cylinder, 62 piston rod, 63 gear, 64 first rack, 65 second rack, 7 strip steel, 8 synchronous gear, 9 cold rolling mill, and 91 rolling roll. Detailed Implementation

[0034] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0035] See Figure 1 and Figure 2 This invention proposes a strip clamping and lifting device for a cold rolling mill, comprising an upper pressure plate 1, a lower pressure plate 2, a lower crossbeam 3, a sliding guide rod bracket, a fixed guide groove 5, and a lifting mechanism 6. An upper stop block 51 and a lower stop block 52 are fixed to both ends of the guide groove 5. The sliding guide rod bracket includes a lower support 41, an upper crossbeam 42, and a guide rod 43. Two guide rods 43 are fixed between the lower support 41 and the upper crossbeam 42, respectively, and are respectively positioned at the left and right ends of the lower support 41 and the upper crossbeam 42. The lower pressure plate 2 is fixed to the lower crossbeam 3. Slider blocks 31 are provided at both ends of the lower crossbeam 3. The sliders 31 are slidably disposed within the guide groove 5 and rest on the lower stop block 52, which supports and limits the sliders 31. The lower stop block 51 is a raised step at the lower end of the guide groove 5, supporting the entire strip clamping and lifting device via the sliders. The upper stop block 51 is a fixed block set at the upper end of the guide groove 5, used to limit the extreme position of the descent of the upper crossbeam 42.

[0036] The slider 31 is provided with a groove 311, and the guide rod 43 passes through the groove 311. When the slider 31 moves, it can move along the guide rod. At this time, the guide rod 43 plays a guiding role for the slider 31. On the other hand, the groove 311 can restrict the position and movement trajectory of the guide rod 43, preventing the guide rod 43 and the sliding guide rod support from deviating. Since both the strip 7 and the upper pressure plate 1 have a certain width, in order for the upper pressure plate to press the strip tightly, the upper pressure plate 1 and the strip 7 should be in full contact. That is, the upper pressure plate 1 and the strip 7 should be parallel to maintain the maximum contact area. The presence of the slider can restrict the movement direction of the upper pressure plate 1, ensuring that the upper pressure plate 1 presses on the strip in a direction parallel to the strip 7. Since the strip 7 has a certain tension, when the strip is lifted upward from below the strip 7, the contact surface between the lower pressure plate 2 and the strip 7 should completely cover the width direction of the strip. Therefore, the width of the lower pressure plate 2 should not be less than the width of the strip 7.

[0037] See Figures 1 to 3 The lifting mechanism 6 is located between the lower support 41 and the lower crossbeam 3. The lifting mechanism 6 includes a hydraulic cylinder 61 and a piston rod 62. The hydraulic cylinder 61 is fixed on the lower support 41, and the piston rod 62 is telescopically located inside the hydraulic cylinder 61. The end of the piston rod 62 is fixedly connected to the lower crossbeam 3. Since the sliding guide rail support is supported and fixed by the lower stop 52, the lower crossbeam 3, the hydraulic cylinder 61, and the piston rod 62, when the piston rod 62 extends, the lower crossbeam 3 and the lower support 41 move away from each other, the sliding guide rail support 4 moves downward, and the upper crossbeam 42 moves downward with the upper pressure plate 1 until the upper crossbeam 42 collides with the upper stop 51; the piston rod 62 continues to extend, and the lower crossbeam 3 and the lower support 41 continue to move away from each other. Due to the obstruction of the upper stop 51, the lower crossbeam 3 moves upward with the lower pressure plate 2 until the upper pressure plate 1 and the lower pressure plate 2 clamp the upper and lower surfaces of the strip steel 7, thereby clamping the strip steel.

[0038] Of course, in other embodiments, the hydraulic cylinder can also be a pneumatic cylinder. The two are similar in principle and are existing technologies. Those skilled in the art can choose between a pneumatic cylinder or a hydraulic cylinder based on existing technologies and the descriptions provided in this invention.

[0039] Since the hydraulic cylinder 61 or pneumatic cylinder is fixed on the lower support 41, and the piston rod 62 is fixedly connected to the lower crossbeam 3, the movement of the upper pressure plate 1 and the lower pressure plate 2 is controlled by the lifting mechanism. Furthermore, since the lifting mechanism 6 is not fixedly connected to other fixed components, it only controls the relative position between the upper pressure plate 1 and the lower pressure plate 2. The absolute position of the upper pressure plate 1 and the lower pressure plate 2 is determined by the fixed guide groove 5 and its two ends, the upper stop block 51 and the lower stop block 52. This avoids interference in the entire strip clamping and lifting device, improving its reliability.

[0040] See Figures 4 to 6In other embodiments, the lifting mechanism 6 can also be a combination of gears and racks, specifically: the lifting mechanism 6 includes a gear 63, a first rack 64, and a second rack 65. The first rack 64 and the second rack 65 mesh with the gear 63 respectively. The first rack 64 and the second rack 65 are arranged parallel to each other on both sides of the gear 63. The upper end of the first rack 64 is fixedly connected to the lower crossbeam 3, and the lower end of the second rack 65 is fixedly connected to the lower bracket 42. When the gear 63 rotates, the first rack 64 and the second rack 65 move simultaneously. The first rack 64 moves upward, causing the lower crossbeam 3 to move upward along with the lower pressure plate 2, and the second rack 65 moves downward, causing the upper crossbeam 42 to move downward along with the upper pressure plate 1, until the upper pressure plate 1 and the lower pressure plate 2 clamp the upper and lower surfaces of the strip steel 7, thereby clamping the strip steel. Since the first rack 64 and the second rack 65 move simultaneously when the gear 63 rotates, the upper pressure plate 1 and the lower pressure plate 2 also move and stop simultaneously. In order to ensure that the upper pressure plate 1 and the lower pressure plate 2 reach the position of the strip at the same time, the movement distance of the first rack 64 should be equal to the movement distance of the lower pressure plate 2, and the movement distance of the second rack 65 should be equal to the movement distance of the upper pressure plate 1.

[0041] The lower pressure plate 2 and the lower crossbeam 3 are placed on the lower stop block 52 via the slider 31. The lower support 41 and the lower crossbeam 3 are connected by a lifting mechanism. Simultaneously, the lifting mechanism 6 and the lower crossbeam 3 serve to fix the sliding guide rod support, thereby fixing the upper pressure plate 1. Therefore, the upper pressure plate 1, lower pressure plate 2, lower crossbeam 3, sliding guide rod support, and lifting mechanism 6 are all supported on the lower stop block 52 at the lower end of the guide groove 5, simplifying the overall device structure. From the structure of the lifting mechanism 6 and the principle of controlling the upper pressure plate 1 and lower pressure plate 2, it can be seen that the upper pressure plate 1 and lower pressure plate 2 are linked through the lifting mechanism 6. Therefore, only one lifting mechanism is needed to control the movement of both parts, making the device simpler and the control easier.

[0042] See Figure 1 , Figure 2 , Figure 7 and Figure 8 Since both the upper pressure plate 1 and the lower pressure plate 2 have a certain width, their lifting and lowering are guided by the guide rod 43, the sliders 31 at both ends of the lower crossbeam 3, the sliding grooves 311 inside the sliders 31, and the guide grooves 5. The lifting mechanism 6 is located in the middle position between the lower crossbeam 3 and the lower support 41. Therefore, during the lifting and lowering process, the left and right ends of the upper pressure plate 1 and the lower pressure plate 2 (within the range of...) Figure 1 and Figure 2The left and right directions shown may produce a certain degree of tilt, and the relative movement of the two sliders 31 and the guide rod 43 may be asynchronous. The tilt of the upper pressure plate 1 and the lower pressure plate 2 may prevent them from fully contacting the strip steel, and the strip steel may not be fully clamped. To avoid this situation, a synchronization device is set between the sliders 31 and the guide rod 43. The synchronization device is a gear and rack structure. Specifically, the guide rod 43 is provided with a synchronization rack extending along the length direction of the guide rod 43, and a synchronization gear 8 that cooperates with the synchronization rack is fixed on the slider 31. When the invention is raised and lowered, the synchronization gear 8 moves up and down along the synchronization rack, so that the two sliders 31 are raised and lowered synchronously, ensuring that the upper pressure plate 1 and the lower pressure plate 2 are in surface contact with the strip steel 7, and fully clamping the strip steel 7. Figure 7 and Figure 8 The diagram shows the synchronizing gears at their upper and lower limits. In actual operation, the two synchronizing gears 8 are aligned in the direction shown. Two hexagonal protective covers are also provided around the synchronizing gears 8 to prevent operators from directly contacting them during use.

[0043] See Figure 7 The strip steel clamping and lifting device of the present invention is set at the roll gap entrance of the cold rolling mill 9. When the roll is replaced, the roll 91 is removed, and the strip steel loses the support of the roll and hangs down under tension. Therefore, the strip steel clamping and lifting device is set at a position close to the roll to lift the strip steel to a height that matches the roll gap box, so as to avoid wear on the strip steel and the roll during the roll replacement process.

[0044] This invention executes different processes depending on the two states of the cold rolling mill: rolling and roll changing. When the cold rolling mill is normally rolling the strip, this invention is in a rolling standby state. When the cold rolling mill is changing rolls, this invention performs the operation of clamping and lifting the strip, specifically as follows:

[0045] See Figure 1 and Figure 4 When the cold rolling mill rolls the strip steel: the piston rod 42 retracts, the slider 31 is placed on the lower stop block 52, the upper pressure plate 1 and the lower pressure plate 2 separate, so that the strip steel 7 can pass smoothly between the upper pressure plate 1 and the lower pressure plate 2;

[0046] See Figure 2 and Figure 3 When changing rolls in the cold rolling mill: the piston rod 42 extends, the lower crossbeam 3 and the lower support 41 move away from each other, the sliding guide support 4 moves downward, the upper crossbeam 42 moves downward with the upper pressure plate 1 until the upper crossbeam 42 collides with the upper stop block 51, the piston rod 62 continues to extend, the lower crossbeam 3 and the lower support 41 continue to move away from each other, due to the obstruction of the upper stop block 51, at this time the lower crossbeam 3 moves upward with the lower pressure plate 2 until the upper pressure plate 1 and the lower pressure plate 2 clamp the upper and lower surfaces of the strip steel 7, thereby clamping the strip steel.

[0047] See Figure 5 and Figure 6 When the lifting mechanism adopts a gear and rack structure, the operation of the present invention during roll changing in the cold rolling mill is as follows: the gear rotates 63, the first rack 64 and the second rack 65 move simultaneously, the first rack 64 moves upward, causing the lower crossbeam 3 to move upward with the lower pressure plate 2, and the second rack 65 moves downward, causing the upper crossbeam 41 to move downward with the upper pressure plate 1, until the upper pressure plate 1 and the lower pressure plate 2 clamp the upper and lower surfaces of the strip 7, thereby clamping and lifting the strip 7 to the set height.

[0048] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A strip clamping and lifting device for a cold rolling mill, characterized in that, It includes an upper and lower pressure plate that can move up and down, and a lifting mechanism for controlling the movement of the upper and lower pressure plates. The upper and lower pressure plates are parallel, with the upper pressure plate positioned above the strip and the lower pressure plate positioned below the strip. When rolling the strip, the upper and lower pressure plates separate, and the strip passes between them. When changing rolls, the upper pressure plate moves downward and the lower pressure plate moves upward. The upper and lower pressure plates are linked by the lifting mechanism to clamp the strip. The strip clamping and lifting device also includes a sliding guide rod frame, a lower crossbeam, and a guide groove. The lower pressure plate is fixed on the lower crossbeam. The lower crossbeam has sliders at both ends, and the sliders are slidably set in the fixed guide groove. The sliding guide rod frame includes an upper crossbeam, a lower support, and a guide rod. The upper crossbeam is used to fix the upper pressure plate. The two ends of the guide rod are respectively connected to the upper crossbeam and the lower support. The lower support is set below the lower crossbeam. The upper end of the guide groove is provided with an upper stop block. The upper crossbeam is set above the upper stop block. The lower end of the guide groove is provided with a lower stop block, and the slider is placed on the lower stop block. The lifting mechanism includes a hydraulic cylinder or pneumatic cylinder and a piston rod. The piston rod is telescopically fixed inside the hydraulic cylinder or pneumatic cylinder. The lower end of the hydraulic cylinder or pneumatic cylinder is fixed to the lower support, and the upper end of the piston rod is fixedly connected to the lower crossbeam. When the piston rod extends, the lower crossbeam and the lower support move away from each other, the sliding guide rail support moves downward, and the upper crossbeam moves downward with the upper pressure plate until the upper crossbeam collides with the upper stop block. The piston rod continues to extend, and the lower crossbeam and the lower support continue to move away from each other. Due to the obstruction of the upper stop block, the lower crossbeam moves upward with the lower pressure plate until the upper pressure plate and the lower pressure plate clamp the upper and lower surfaces of the strip steel, thereby clamping the strip steel.

2. The strip clamping and lifting device for a cold rolling mill according to claim 1, characterized in that, The slider is provided with a groove, and the guide rod passes through the groove.

3. The strip clamping and lifting device for a cold rolling mill according to claim 2, characterized in that, A synchronization device is provided between the slider and the guide rod. The synchronization device is used to make the two sliders rise and fall synchronously, and the synchronization device is also used to make the two guide rods rise and fall synchronously.

4. The strip clamping and lifting device for a cold rolling mill according to claim 1, characterized in that, The lower stop is a step protruding from the lower end of the guide groove.

5. A strip clamping and lifting device for a cold rolling mill according to claim 1, characterized in that, The width of the lower pressure plate is not less than the width of the strip steel.

6. A strip clamping and lifting device for a cold rolling mill according to claim 1, characterized in that, The width of the upper pressure plate is not less than the width of the strip steel.

7. A strip clamping and lifting device for a cold rolling mill according to any one of claims 1-6, characterized in that, The strip clamping and lifting device is used to be installed at the roll gap entrance of the cold rolling mill.

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