A device for improving the online calibration accuracy of the roll gap of a slab continuous casting machine

Abstract

A device for improving the online calibration accuracy of the roll gap of a slab continuous casting machine, which relates to the technical field of roll gap calibration. The technical solution is as follows: It includes a contact block, a base and a gasket group. The gasket group is located between the contact block and the base. A limiting component for limiting the gasket group is arranged on the base, and a locking component is jointly arranged on the contact block and the base. The beneficial effect of this technical solution is that through the cooperation among the insertion block, the contact block and the base, it is found in use that the problem of inaccurate online calibration accuracy of the roll gap of the segment can be effectively solved, thereby ensuring the online operation life of the segment. At the same time, the gasket group is located between the contact block and the base, and the base and the outer arc frame of the segment can be firmly fixed, enhancing the stability of the entire device. When the product specification is adjusted, only the screw rod needs to be rotated to adjust the height of the adjusting plate, which is simple and convenient to operate and improves the replacement efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of roll gap calibration, and particularly to a device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine. Background Art

[0002] The roll gap accuracy of a slab continuous casting machine is the most important casting billet quality control parameter of the continuous casting machine equipment. It plays a crucial role in the internal quality control of the casting billet. Deviations in roll gap accuracy will cause serious central segregation of the casting billet and may also cause intermediate cracks. The requirement for roll gap accuracy generally should not exceed the standard value of ±0.3 mm. After the segment is put into operation for a period of time, the roll gap accuracy will deviate due to some reasons. At this time, on-line roll gap calibration operations need to be carried out to calibrate and correct the deviation value of the roll gap.

[0003] Danieli designed a 200*2300 mm cross-section slab continuous casting machine, which is an articulated hydraulic segment. At the same time, by replacing the mold and the bending section, the production of casting billets with different thickness cross-sections can be realized. The calibration device of the casting machine is installed on the inner and outer arc frames. When performing on-line calibration of the roll gap accuracy of the segment, it is necessary to use the calibration pressure (30 tons for segments 1-6 and 40 tons for segments 7-14) to press the calibration device on the inner arc frame of the segment tightly against the calibration device on the outer arc frame of the segment, use an on-line roll gap measuring instrument to actually measure the roll gap value, and assign the measured value to the sensor for roll gap calibration.

[0004] After the inner and outer arc calibration devices are pressed tightly, the designed value of the measured roll gap is about 180 mm, and there is a deviation of about 20 mm from the actual production roll gap of 200 mm. That is, after the calibration is completed, there will be a certain error when the actual segment is in production, affecting the roll gap accuracy. If the casting machine is changed to produce casting billets with a thicker cross-section, the deviation will be even greater.

[0005] Meanwhile, the material of the calibration device is 45# steel. After the segment is used online for a period of time, its surface is severely rusted. Each time calibration is required, rust remover and sandpaper are needed to clean the rust, which takes a long time and has a high cleaning difficulty. As a result, there is a certain gap after the inner and outer arc calibration devices are tightened, affecting the actual measured roll gap accuracy. At the same time, the inner and outer arc calibration device blocks are fixed to the inner and outer arc frames respectively by four bolts. During offline maintenance, since it is necessary to adjust the overall roll gap value of the segment by adding or reducing gaskets at the bottom of the outer arc calibration device, the outer arc calibration device cannot be fully welded to the outer arc frame to be completely fixed. Therefore, when performing online roll gap calibration for the arc and straightening sections, because the segment itself is not horizontal, the force is relatively large after the inner arc frame is pressed down, and a shearing force is generated on the contact surface of the inner and outer arc calibration devices, causing a misalignment after the calibration devices are in contact, which leads to the stretching deformation of the bolts fixing the outer arc calibration device, and also affects the online measured roll gap accuracy, resulting in inaccurate measured roll gap values. Also, since the soft reduction area of the No. 4 continuous caster is generally located in arc segment 6 and straightening segments 7 and 8, the inaccurate online roll gap values in segments 6 - 8 will directly affect the internal quality of the billet. At the same time, due to different product specifications, after changing the product, the original calibration device is still used for calibration, and there will be a certain deviation in the production roll gap, affecting the accuracy. Therefore, improvement is needed. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies that the gasket group of the existing outer arc calibration device is located at the lower part of the base, resulting in the stretching deformation of the bolts fixing the outer arc calibration device, which will affect the online measured roll gap accuracy. At the same time, the thicker the thickness specification of the produced billet, the greater the roll gap deviation during calibration when using the original calibration device, affecting the accuracy, and to propose a device for improving the online calibration accuracy of the roll gap of a slab caster.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A device for improving the online calibration accuracy of the roll gap of a slab caster, including a contact block, a base, and a gasket group. The gasket group is located between the contact block and the base. A limiting component for limiting the gasket group is arranged on the base. A locking component is jointly arranged on the contact block and the base. A plurality of second stepped holes are arranged on the base, and a first bolt is penetrated through the second stepped holes. The first bolt is used to connect the outer arc frame of the segment.

[0009] The gasket group is changed from the bottom of the original base to the upper part. After the base is fixed, the base and the outer arc frame of the segment are fully welded and fixed, enhancing the overall stability of the outer arc calibration device and ensuring the accuracy of the upper part of the contact block.

[0010] Preferably, the limiting component includes a second card slot provided on the upper surface of the base. A positioning block is placed in the second card slot. A first card slot is provided on the lower surface of the contact block. A limiting hole is provided in the middle of the gasket group. The upper end of the positioning block passes through the limiting hole and extends into the first card slot.

[0011] The upper end of the positioning block is located in the second card slot, the lower end is located in the first card slot, and it passes through the limiting hole on the gasket group. The positioning block connects and fixes the base and the contact block, and at the same time plays a role in fixing and adjusting the gasket group.

[0012] Preferably, the locking component includes four first stepped holes provided on the contact block. First through holes corresponding to the first stepped holes are provided on the gasket group. Threaded blind holes corresponding to the first through holes are provided on the base. A second bolt is penetrated in the first stepped hole. The lower end of the second bolt passes through the first through hole and is threadedly connected with the threaded blind hole. A plurality of second stepped holes are provided on the base. A first bolt is penetrated in the second stepped hole.

[0013] The second bolt limits and fixes the contact block, the gasket group and the base.

[0014] Preferably, an insertion block is connected to the contact block. Connection ports are provided below the two opposite side walls of the contact block. The insertion block includes a connecting plate. L-shaped plates are fixed at both ends of the lower surface of the connecting plate. The L-shaped plates are located outside the connection ports, and the horizontal sections of the L-shaped plates are in contact with the groove walls of the connection ports.

[0015] The arrangement of the connection ports and the L-shaped plates enables the two L-shaped plates below the insertion block to be inserted into both sides of the connection ports to limit the insertion block.

[0016] Preferably, a groove is provided on the connecting plate. Limiting plates are fixed on the opposite side walls of the groove. An adjusting plate is placed on the two limiting plates together. An adjusting component for controlling the lifting of the adjusting plate is provided on the lower surface of the adjusting plate.

[0017] The adjusting component adjusts the height of the adjusting plate. When the product specifications are changed, the calibration accuracy is equally accurate, and the operation is simple and convenient.

[0018] Preferably, the adjusting component includes an adjusting rod hinged to the lower surface of the adjusting plate. A spherical block is hinged to the lower end of the adjusting rod. A placement groove is provided on the upper surface of the contact block. Two sliders are slidably connected in the placement groove. A semi-circular groove is provided on the slider. The spherical block is located in the semi-circular groove. Screws are respectively rotatably connected to the opposite ends of the two sliders. Threaded through holes are provided at both ends of the placement groove. The end of the screw away from the slider passes through the threaded through hole and extends outside the contact block. The screw is in threaded fit connection with the threaded through hole.

[0019] By determining the number of turns or the moving position of the lead screw, the height supported by the adjusting rod is determined, thereby adjusting the height of the adjusting plate.

[0020] Preferably, slot holes are provided on both L-shaped plates, and the slot holes are correspondingly arranged with the lead screw.

[0021] The slot holes facilitate continuing to control the rotation of the lead screw after installation. At the same time, the lead screw limits the entire insertion block to prevent the insertion block from moving too much and affecting the later calibration.

[0022] Preferably, the material of the contact block is 3Cr13 stainless steel, and the material of the base is 42CrMo.

[0023] 3Cr13 stainless steel prevents the surface from generating water rust and affecting the measurement accuracy.

[0024] Preferably, handles are fixed on both side walls of the insertion block.

[0025] The handles facilitate the staff to control the connection between the insertion block and the contact block.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooperation between the insertion block, the contact block and the base, it is found in use that the problem of inaccurate calibration of the roll gap of the online segment can be effectively solved, thereby ensuring the online operation life of the segment. At the same time, the gasket group is located between the contact block and the base, and the base and the outer arc frame of the segment can be fixed firmly, enhancing the stability of the entire device. When the product specification is adjusted, only the lead screw needs to be rotated to adjust the height of the adjusting plate, which is simple and convenient to operate and improves the replacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a specific embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram of the connection between the contact block and the base in a specific embodiment of the present invention.

[0030] Figure 3 It is a schematic structural diagram of the upper surface of the contact block in a specific embodiment of the present invention.

[0031] Figure 4 It is a front view of the insertion block in a specific embodiment of the present invention.

[0032] Figure 5 This is a schematic structural diagram of the contact block in the specific embodiment of the present invention.

[0033] Figure 6 This is a top view of the base in the specific embodiment of the present invention.

[0034] Figure 7 This is a schematic structural diagram of the positioning block in the specific embodiment of the present invention.

[0035] Figure 8 This is a top view of the gasket group in the specific embodiment of the present invention.

[0036] Figure 9 This is a schematic structural diagram of the base in the specific embodiment of the present invention.

[0037] Figure 10 This is a top view of the insertion block in the specific embodiment of the present invention.

[0038] Figure 11 This is a schematic structural diagram of the insertion block in the specific embodiment of the present invention.

[0039] Figure 12 This is a schematic structural diagram of the adjustment assembly in the specific embodiment of the present invention.

[0040] Figure 13 This is a schematic structural diagram of the spherical block in the specific embodiment of the present invention.

[0041] In the figure: 1 contact block, 2 gasket group, 3 positioning block, 4 base, 5 first bolt, 6 second bolt, 7 insertion block, 101 first stepped hole, 102 first card slot, 103 connection port, 104 slider, 105 placement groove, 106 lead screw, 107 slot hole, 201 through hole, 202 limit hole, 401 second stepped hole, 402 second card slot, 403 threaded blind hole, 701 L-shaped plate, 702 handle, 703 connecting plate, 704 adjusting plate, 705 limiting plate, 706 adjusting rod, 707 groove, 708 spherical block, 709 notch. Specific Embodiment

[0042] To make the objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the specific embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0043] Refer to Figures 1-9, a device for improving the online calibration accuracy of the roll gap of a slab continuous casting machine, including a contact block 1, a base 4 and a gasket group 2. The gasket group 2 is located between the contact block 1 and the base 4. A limiting component for limiting the gasket group 2 is arranged on the base 4. A locking component is jointly arranged on the contact block 1 and the base 4. The material of the contact block 1 is 3Cr13 stainless steel, and the 3Cr13 stainless steel prevents water rust from generating on the surface and affecting the measurement accuracy. The material of the base 4 is 42CrMo. The gasket group 2 is changed from the bottom of the original base 4 to the upper part. The first bolt 5 is used to connect the outer arc frame of the segment. After the base 4 is fixed with the first bolt 5, the base 4 and the outer arc frame of the segment are fully welded and fixed to enhance the overall stability of the outer arc calibration device and ensure the accuracy of the upper part of the contact block 1 at the same time.

[0044] Refer to Figures 5-9 , the limiting component includes a second clamping groove 402 arranged on the upper surface of the base 4. A positioning block 3 is placed in the second clamping groove 402. A first clamping groove 102 is arranged on the lower surface of the contact block 1. A limiting hole 202 is arranged in the middle of the gasket group 2. The upper end of the positioning block 3 passes through the limiting hole 202 and extends into the first clamping groove 102. The upper end of the positioning block 3 is located in the second clamping groove 402, and the lower end is located in the first clamping groove 102 and passes through the limiting hole 202 on the gasket group 2. The positioning block 3 connects and fixes the base 4 and the contact block 1, and at the same time plays a role in fixing and adjusting the gasket group. The positioning block 3 is made of 3Cr13 stainless steel.

[0045] Refer to Figure 1 , 2 Refer to FIGS. 5, 6 and 9. The locking component includes four first stepped holes 101 arranged on the contact block 1. The upper end of the second bolt 6 is located in the large-diameter hole of the first stepped hole 101. A first through hole 201 corresponding to the first stepped hole 101 is arranged on the gasket group 2. A threaded blind hole 403 corresponding to the first through hole 201 is arranged on the base 4. A second bolt 6 is penetrated in the first stepped hole 101. The lower end of the second bolt 6 passes through the first through hole 201 and is threadedly connected with the threaded blind hole 403. The second bolt 6 limits and fixes the contact block 1, the gasket group 2 and the base 4. A plurality of second stepped holes 401 are arranged on the base 4. A first bolt 5 is penetrated in the second stepped holes 401. The first bolt 5 is changed from an 8.8-grade bolt to a 10.9-grade bolt with a higher performance grade to enhance its stability.

[0046] Refer to Figures 1-5, an insertion block 7 is connected to the contact block 1. Connection ports 103 are provided below two opposite side walls of the contact block 1. The insertion block 7 includes a connection plate 703. L-shaped plates 701 are fixed to both ends of the lower surface of the connection plate 703. The L-shaped plates 701 are located outside the connection ports 103. The arrangement of the connection ports 103 and the L-shaped plates 701 enables the two L-shaped plates 701 below the insertion block 7 to be inserted into both sides of the connection ports 103 to limit the insertion block 7. Moreover, the horizontal sections of the L-shaped plates 701 are in abutting contact with the groove walls of the connection ports 103, facilitating the insertion of the insertion block 7 above the contact block 1. Also, the height of the insertion block 7 needs to be set according to the height of the contact block 1. After the insertion block 7 and the contact block 1 are connected, the overall height is 200 mm, which is consistent with the production roll gap value, and the original error can be eliminated.

[0047] Refer to Figures 10-13, a groove 707 is provided on the connecting plate 703. Limiting plates 705 are fixed on the opposite side walls of the groove 707. An adjusting plate 704 is placed on the two limiting plates 705 together. Notch openings 709 are provided on the two side walls of the groove 707. When the adjusting plate 704 is removed from the groove 707, corresponding L-shaped blocks can be inserted according to the height of the adjusting plate 704. The horizontal section of the L-shaped block abuts against the lower surface of the adjusting plate 704, and the vertical section abuts against the notch opening 709. The limiting plates 705 limit the adjusting plate 704, and at the same time ensure that the height of the adjusting plate 704 is the same as the height of the upper surface of the groove 707, or the upper surface is located within the groove 707, so as to avoid the influence of the adjusting plate 704 on the calibration accuracy. An adjusting assembly for controlling the lifting of the adjusting plate 704 is provided on the lower surface of the adjusting plate 704. The adjusting assembly adjusts the height of the adjusting plate 704. When the product specifications are changed, the calibration will be more accurate, and the operation is simple and convenient. The adjusting assembly includes an adjusting rod 706 hinged to the lower surface of the adjusting plate 704. A spherical block 708 is hinged to the lower end of the adjusting rod 706. A placing groove 105 is provided on the upper surface of the contact block 1. Two sliding blocks 104 are slidably connected in the placing groove 105. Semi-circular grooves are provided on the sliding blocks 104. The spherical block 708 is located within the semi-circular groove. The spherical block 708 can also be a block such as a cylinder whose bottom is adapted to the semi-circular groove. Due to the setting of the semi-circular groove and the spherical block 708, when the sliding block 104 moves, the bottom of the spherical block 708 will always be located within the semi-circular groove. When the lead screw 106 controls the movement of the sliding block 104, the sliding block 104 will pull the upper spherical block 708 to move together. When the spherical block 708 moves, it will change the angle of the adjusting rod 706, thereby moving the adjusting plate 704 upward. The gravity of the adjusting plate 704 will be transmitted to the spherical block 708 through the adjusting rod 706. Therefore, the force of the adjusting rod 706 presses on the sliding block 104 through the spherical block 708. Since the bottom is, the opposite ends of the two sliding blocks 104 are respectively rotatably connected to lead screws 106. Threaded through holes are provided at both ends of the placing groove 105. The end of the lead screw 106 away from the sliding block 104 passes through the threaded through hole and extends to the outside of the contact block 1. The lead screw 106 is in threaded fit with the threaded through hole. According to the use of the sliding block 104 in the placing groove 105, a stop block is added at the middle position to prevent the sliding block 104 from moving too far, which may affect the later use. The lead screw 106 controls the movement of the sliding block 104, thereby controlling the rotation angle of the adjusting rod 706. And when placing, first understand the number of turns of the lead screw 106 rotating or the moving position, and the height supported by the adjusting rod 706, so as to adjust the height of the adjusting plate 704. Handles 702 are fixed on the two side walls of the two insertion blocks 7. The handles 702 facilitate the staff to control the connection between the insertion block 7 and the contact block 1. Slot holes 107 are provided on the two L-shaped plates 701. The slot holes 107 are correspondingly arranged with the lead screws 106. The slot holes 107 facilitate the continuous control of the rotation of the lead screws 106 after installation. At the same time, the lead screws 106 limit the entire insertion block 7 to prevent the insertion block 7 from moving too much, which may affect the later calibration.

[0048] In use, first place the first bolts 5 in multiple second stepped holes 401 on the base 4, and use the first bolts 5 to fix with the outer arc frame of the segment. At the same time, fully weld and fix the base 4 and the outer arc frame of the segment to enhance the overall stability of the outer arc calibration device. Place the gasket group 2 between the contact block 1 and the positioning block 3, and at the same time place the gasket group 2 in the second card slot 402 on the base 4 to limit the gasket group 2. After adjusting the horizontal gasket group 2, use the second bolts 6 to fix the contact block 1, the gasket group 2 and the base 4. Then insert the two L-shaped plates 701 on the insert block 7 into the connection ports 103 on both sides of the contact block 1 respectively. At this time, the lead screw 106 will extend into the slot hole 107 until the lead screw 106 abuts against the side wall of the slot hole 107. At this time, stop moving. Then place the spherical block 708 on the lower surface of the adjusting plate 704 in the arc-shaped groove on the slider 104, and at the same time the two ends of the adjusting plate 704 abut against the two limiting plates 705. During the online roll gap calibration, the upper surface of the insert block 7 is in direct contact with the inner arc calibration device, and the designed roll gap value after they are pressed and adhered is 200 mm, which is consistent with the production roll gap value, and the original error can be eliminated. When the product specifications change, according to the height of the product, drive the lead screw 106 to rotate by a wrench or other equipment. When the lead screw 106 rotates, the slider 104 will move, and the slider 104 drives the adjusting rod 706 to move. The adjusting rod 706 supports the adjusting plate 704 until the required height is reached. Then adjust the other lead screw 106 to a suitable position. When the entire adjusting plate moves out of the groove 707, corresponding L-shaped blocks can be inserted at the positions of the two side wall notches 709 of the groove 707 to support the adjusting plate 704. In this way, the adjusting plate 704 can be adjusted according to different product specifications, and the application range is wide.

[0049] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine, characterized in that: It includes a contact block (1), a base (4) and a gasket group (2). The gasket group (2) is located between the contact block (1) and the base (4). A limiting component for limiting the gasket group (2) is provided on the base (4). A locking component is jointly provided on the contact block (1) and the base (4). A plurality of second stepped holes (401) are provided on the base (4), and a first bolt (5) is penetrated through the second stepped holes (401). The first bolt is used to connect the outer arc frame of the segment.

2. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 1, characterized in that: The limiting component includes a second card slot (402) provided on the upper surface of the base (4). A positioning block (3) is placed in the second card slot (402). A first card slot (102) is provided on the lower surface of the contact block (1). A limiting hole (202) is provided in the middle of the gasket group (2). The upper end of the positioning block (3) penetrates through the limiting hole (202) and extends into the first card slot (102).

3. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 1, characterized in that: The locking component includes four first stepped holes (101) provided on the contact block (1). A first through hole (201) corresponding to the first stepped holes (101) is provided on the gasket group (2). A threaded blind hole (403) corresponding to the first through hole (201) is provided on the base (4). A second bolt (6) is penetrated through the first stepped holes (101). The lower end of the second bolt (6) penetrates through the first through hole (201) and is threadedly connected with the threaded blind hole (403).

4. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 1, characterized in that: An insertion block (7) is connected to the contact block (1). Connection ports (103) are provided below the two opposite side walls of the contact block (1). The insertion block (7) includes a connection plate (703). L-shaped plates (701) are fixed to both ends of the lower surface of the connection plate (703). The L-shaped plates (701) are located outside the connection ports (103), and the horizontal sections of the L-shaped plates (701) are in contact with the groove walls of the connection ports (103).

5. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 4, characterized in that: A groove (707) is provided on the connection plate (703). Limiting plates (705) are fixed to the opposite side walls of the groove (707). An adjusting plate (704) is placed on the two limiting plates (705). An adjusting component for controlling the lifting of the adjusting plate (704) is provided on the lower surface of the adjusting plate (704).

6. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 5, characterized in that: The adjusting component includes an adjusting rod (706) hinged to the lower surface of the adjusting plate (704). A spherical block (708) is hinged to the lower end of the adjusting rod (706). A placement groove (105) is provided on the upper surface of the contact block (1). Two sliders (104) are slidably connected in the placement groove (105). A semi-circular groove is provided on the sliders (104). The spherical block (708) is located in the semi-circular groove. The opposite ends of the two sliders (104) are respectively rotatably connected to lead screws (106). Threaded through holes are provided at both ends of the placement groove (105). The end of the lead screw (106) away from the slider (104) passes through the threaded through hole and extends to the outside of the contact block (1). The lead screw (106) is threadedly engaged with the threaded through hole.

7. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 6, characterized in that: Slot holes (107) are provided on both of the two L-shaped plates (701), and the slot holes (107) are arranged corresponding to the lead screw (106).

8. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 1, characterized in that: The material of the contact block (1) is 3Cr13 stainless steel, and the material of the base (4) is 42CrMo.

9. The device for improving the on-line calibration accuracy of the roll gap of a slab continuous casting machine according to claim 4, characterized in that: Handles (702) are fixed on both side walls of the insertion block (7).

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