Telescopic device and hot rolling unit

Abstract

The telescopic device is used for adjusting the position of a guide plate of the hot rolling unit and comprises a connecting seat, a telescopic rod, a telescopic rod and a telescopic rod, the supporting frame is mounted on a rack of the hot rolling unit; the telescopic assembly comprises a first plate piece, a second plate piece, a connecting rod, a limiting piece and an elastic piece, the first plate piece is provided with a via hole, the connecting rod is provided with a first end and a second end, the first end penetrates through the via hole in a clearance mode and is connected with the limiting piece, the second end is connected with the second plate piece, and the elastic piece is connected with the limiting piece. The elastic piece is located between the first plate piece and the second plate piece, the two ends of the elastic piece act on the first plate piece and the second plate piece respectively, and the first plate piece and the second plate piece are connected to the connecting base and the supporting frame respectively.

Description

Technical Field

[0001] The present application belongs to the technical field of steel rolling, and specifically relates to a telescopic device and a hot rolling mill unit. Background Art

[0002] The entrance and exit of each frame of the hot rolling mill are equipped with upper and lower guide plates, which are arranged in pairs and are connected to scrapers for fitting to the working rolls to block the cooling water outside the strip and avoid contact between the cooling water and the strip. Since the thickness of the strip rolled by the hot rolling mill is different, it is necessary to adjust the roll gap between the two working rolls set in the height direction, so the position of the working roll will change, and the scraper will fit with the working roll. Therefore, the upper and lower guide plates used to install the scraper also need to be adjusted according to the position change of the working roll.

[0003] In the related technology, both the upper and lower guide plates are supported and adjusted by cylinders. Since the hot rolling mill rolls hot-rolled steel strips at high temperatures, the cylinders are baked for a long time, so the cylinders are prone to internal leakage and pipeline damage. Therefore, the production line needs to be stopped to replace the cylinders, but it takes up to 3 hours to replace the cylinders, which makes it impossible to stabilize production and cause the upstream continuous casting machine to break, which seriously restricts the production rhythm and stability of the production line. Summary of the invention

[0004] In order to solve the current technical problem of poor production stability of the production line caused by cylinder failure, the present application provides a telescopic device and a hot rolling mill unit.

[0005] In a first aspect of the present application, a telescopic device is provided for adjusting the position of a guide plate of a hot rolling mill, comprising:

[0006] A connecting seat connected to the guide plate;

[0007] A support frame installed on the frame of the hot rolling mill;

[0008] The telescopic assembly includes a first plate, a second plate, a connecting rod, a limit member and an elastic member, wherein the first plate is provided with a through hole, the connecting rod is provided with a first end and a second end, the first end passes through the through hole in a gap and is connected to the limit member, the second end is connected to the second plate, the elastic member is located between the first plate and the second plate, and the two ends act on the first plate and the second plate respectively, the first plate and the second plate are respectively connected to the support frame and the connecting seat.

[0009] In some embodiments, the elastic member is a spring, and the spring is sleeved outside the connecting rod.

[0010] In some embodiments, the connecting rod, the limiting member, and the spring are each provided in plurality and correspond one to one, and the plurality of connecting rods are distributed at intervals.

[0011] In some embodiments, four connecting rods are provided, and the four connecting rods are respectively located at four corners of the same square.

[0012] In some embodiments, the connecting rod is provided with an external thread, the limiting member is a nut, and the nut is threadedly connected to the external nut of the first end.

[0013] In some embodiments, the telescopic assembly further includes a screw rod and an adjusting sleeve, wherein the screw rod is connected to the first plate, one end of the adjusting sleeve is threadedly connected to the screw rod, and the other end is connected to the support frame.

[0014] In some embodiments, the telescopic assembly further includes a lock nut threadedly connected to the screw rod, and the nut is located between the first plate and the adjusting sleeve.

[0015] In some embodiments, the support frame is provided with a positioning groove for the adjusting sleeve to extend into and an operating port connected to the positioning groove, wherein the operating port faces upward and is connected to the notch of the positioning groove.

[0016] In some embodiments, the connecting seat includes a plurality of enclosures connected to the guide plate, and the plurality of enclosures and the guide plate together form a receiving groove for receiving the second plate member.

[0017] In a second aspect of the present application, a hot rolling mill group is provided, comprising the telescopic device of the first aspect.

[0018] The telescopic device provided in the embodiment of the present application includes a connecting seat, a support frame and a telescopic assembly. The telescopic assembly includes a first plate, a second plate, a connecting rod, a limiter and an elastic member. It can be seen that the telescopic device is a purely mechanical structure. Compared with the traditional cylinder replacement, it does not require valve opening and closing, cylinder hose disassembly and assembly, and trial operation. It only needs to install the connecting seat on the guide plate, the seat support frame on the frame, and then install the telescopic assembly between the connecting seat and the support frame. It takes a short time, about 15 minutes, and has a small size, which can be used in the narrow operating space between the frame and the guide plate. Therefore, in the case of cylinder failure, the telescopic device can be temporarily installed to replace the cylinder, which can be completed without the upstream continuous casting machine being interrupted, ensuring the stability of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the top view of the structure of the telescopic device and the guide plate in one or more embodiments of the present application is shown.

[0020] Figure 2A three-dimensional diagram of the telescoping assembly is shown.

[0021] Figure 3 Shows Figure 2 Schematic diagram of the structure of the telescopic component.

[0022] Figure 4 Shows Figure 2 A schematic structural diagram of the telescopic assembly along the axial perspective of the adjusting sleeve.

[0023] Description of reference numerals:

[0024] 100-frame, 110-support frame, 111-operating port, 112-positioning slot, 210-first plate, 220-second plate, 230-connecting rod, 240-limiting member, 250-elastic member, 260-screw rod, 270-adjusting sleeve, 280-lock nut, 300-guide plate, 310-connecting seat. DETAILED DESCRIPTION

[0025] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] The first aspect of the present application provides a telescopic device, which can adjust the position of the guide plate of the hot rolling mill, is easy to install, and has a short fault handling time, thereby ensuring the stability of the scraper water sealing on the guide plate and improving production stability.

[0027] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0028] See also Figure 1 as well as Figure 2 The telescopic device provided in the embodiment of the present application includes a connecting seat 310, a support frame 110 and a telescopic assembly. Among them:

[0029] The connecting seat 310 is connected to the guide plate 300, providing a structure for connecting the telescopic assembly to the guide plate 300. The support frame 110 is installed on the frame 100 of the hot rolling mill, providing a mounting base for the telescopic assembly. The telescopic assembly includes a first plate 210, a second plate 220, a connecting rod 230, a stopper 240 and an elastic member 250. The first plate 210 is provided with a through hole, and the connecting rod 230 is provided with a first end and a second end. The first end passes through the through hole and is connected to the stopper 240, and the second end is connected to the second plate 220. The elastic member 250 is located between the first plate 210 and the second plate 220, and the two ends act on the first plate 210 and the second plate 220 respectively. The first plate 210 and the second plate 220 are connected to the support frame 110 and the connecting seat 310 respectively.

[0030] A support frame 110 is provided on the frame 100 to realize the installation of the telescopic assembly. In the telescopic assembly, the second plate 220 is connected to the guide plate 300 through the connecting seat 310. Therefore, when the roller gap of the working roller changes position, the scraper and the roller surface of the working roller are fitted, so the scraper and the guide plate 300 will also change position, thereby changing the position of the second plate 220. The second end of the connecting rod 230 is connected to the second plate 220, and the first end is matched with the through-hole clearance of the first plate 210, which makes the first plate 210 It can reciprocate along the axial direction of the connecting rod 230, thereby realizing the spacing adjustment between the first plate 210 and the second plate 220, and the second plate 220 is connected to the connecting seat 310, and the first plate 210 is connected to the support frame 110, realizing the spacing adjustment between the connecting seat 310 and the support frame 110, and the connecting seat 310 and the support frame 110 are respectively arranged on the guide plate 300 and the frame 100, so that the scraper can be adjusted according to the position matching of the working roller, ensuring that the scraper fits and seals the working rollers at different positions. Due to the provision of the elastic member 250, under the elastic force of the elastic member 250 and the pressing action of the first plate 210 and the second plate 220, the first plate 210 and the second plate 220 remain stable at a suitable spacing.

[0031] If the cylinder is replaced, it is necessary to close the valve (5 minutes), remove the cylinder hose (5 minutes), remove the bottom of the cylinder head and the tail pin (40 minutes), remove the cylinder head pin offline (30 minutes), remove the cylinder cover and protection (10 minutes), remove the old cylinder and install the new cylinder (10 minutes), install the cylinder cover and protection (10 minutes), assemble the cylinder head pin offline (40 minutes), install the cylinder tail pin and head floor online (30 minutes), reinstall the cylinder pipeline (5 minutes) and open the valve for trial operation (5 minutes), which takes a very long time.

[0032] Since the telescopic assembly provided in the present application is a mechanical structure, it is only necessary to install the connecting seat 310 on the guide plate 300, the seat support frame 110 on the frame 100, and then install the telescopic assembly between the connecting seat 310 and the support frame 110. It takes a short time, about 15 minutes, and has a small size, and can be suitable for the narrow operating space between the frame 100 and the guide plate 300. Therefore, in the event of cylinder failure, a telescopic device can be temporarily installed to replace the cylinder, and it can be completed without stopping the casting of the upstream continuous casting machine.

[0033] The cylinder is replaced during the operation of the telescopic device. After the cylinder is replaced, the telescopic device is replaced by the cylinder, thereby ensuring production stability.

[0034] In some embodiments, see Figure 2 The elastic member 250 is a spring, located between the first plate 210 and the second plate 220, and the spring is sleeved outside the connecting rod 230, and the two ends of the spring are respectively in contact with the first plate 210 and the second plate 220. The spring provides a force for the first plate 210 and the second plate 220 to move away from each other, and the connecting seat 310 and the support frame 110 provide a force for the first plate 210 and the second plate 220 to move closer to each other, so that the first plate 210 and the second plate 220 maintain a suitable distance, and at this time, the scraper just fits tightly against the roller surface of the working roller. In other embodiments, the elastic member 250 can also be a spring sheet, so that the first plate 210 and the second plate 220 maintain a suitable distance.

[0035] In some embodiments, there are multiple connecting rods 230, stoppers 240, and springs, and they correspond one to one, and the multiple connecting rods 230 are distributed at intervals. The multiple connecting rods 230, stoppers 240, and springs are provided to improve the force uniformity of each position of the first plate 210 and the second plate 220, and ensure the stability of the scraper position adjustment.

[0036] In some embodiments, see Figure 2 , there are four connecting rods 230, four stoppers 240 and four springs, the four connecting rods 230 are respectively located at the four corners of the same square, the springs are sleeved outside the corresponding connecting rods 230, and the stoppers 240 are connected to the first ends of the corresponding connecting rods 230. The four connecting rods 230 are distributed in a square, so that the number of parts is small, the cost is low, and the force uniformity of the first plate 210 and the second plate 220 is guaranteed, so that the second plate 220 does not tilt, twist or reverse after contacting the guide plate 300, and the force is better uniform. In other embodiments, the number of connecting rods 230 can also be set to six or eight, etc., which can also ensure the force uniformity of the first plate 210 and the second plate 220.

[0037] In some embodiments, the connecting rod 230 is provided with an external thread, the stopper 240 is a nut, the stopper 240, the first plate 210 and the second plate 220 are arranged in sequence, and the nut is threadedly connected to the external nut at the first end. When the guide plate 300 and the frame 100 are at the maximum position, the nut and the plate surface of the first plate 210 are tightly fitted and limited to prevent the connecting rod 230 from coming out of the first plate 210. When the guide plate 300 and the frame 100 are not at the maximum position, there is a gap between the nut and the first plate 210. The stopper 240 uses a nut to facilitate connection with the connecting rod 230, and the position is easy to adjust according to actual conditions. In other embodiments, the stopper 240 can also be a stopper block, which is welded to the first end of the connecting rod 230, and can also ensure that the connecting rod 230 does not come out of the first plate 210.

[0038] In some embodiments, the telescopic assembly further includes a screw rod 260 and an adjusting sleeve 270, wherein the screw rod 260 is connected to the first plate 210, one end of the adjusting sleeve 270 is threadedly connected to the screw rod 260, and the other end is connected to the support frame 110. The adjusting sleeve 270 is threadedly connected to the screw rod 260, and the spacing between the first plate 210 and the support frame 110 can be adjusted to adjust the axial size of the telescopic assembly along the connecting rod 230, which can be applied to different application scenarios of the spacing between the guide plate 300 and the frame 100, and has strong versatility. Furthermore, when the spring is in a relaxed state, the spring can also be in a compressed state by adjusting the relative rotation between the sleeve 270 and the screw rod 260.

[0039] In some embodiments, see Figure 3 as well as Figure 4 The telescopic assembly further includes a lock nut 280 threadedly connected to the screw rod 260, and the lock nut 280 is located between the first plate 210 and the adjusting sleeve 270. The lock nut 280 can lock the position of the adjusting sleeve 270 to prevent the adjusting sleeve 270 from loosening during operation. In other embodiments, the screw rod 260 is provided with a plurality of locking holes spaced along the length direction of the screw rod 260, and the telescopic assembly further includes a locking pin, the middle portion of which is located in any locking hole, and the two ends extend out of the locking hole and fit the end surface of the adjusting sleeve 270, so as to achieve the locking of the adjusting sleeve 270.

[0040] In some embodiments, the support frame 110 is provided with a positioning groove 112 for the adjustment sleeve 270 to extend into and an operating port 111 connected to the positioning groove 112, the operating port 111 facing upward and connected to the notch of the positioning groove 112. The operating port 111 is provided, and the end of the sleeve can also be placed in the positioning groove 112 through the operating port 111, which is convenient for installation, short operation time and high efficiency. The setting of the positioning groove 112 can realize the position positioning of the adjustment sleeve 270 and is convenient for disassembly. The end face of the adjustment sleeve 270 is pressed against the bottom of the positioning groove 112, thereby realizing the connection between the telescopic assembly and the support frame 110. In other embodiments, when the installation direction of the telescopic assembly is upward, the operating port 111 may not be provided, the notch of the positioning groove 112 faces upward, and the adjustment sleeve 270 is directly inserted into the positioning groove 112. In some other embodiments, the support frame 110 is provided with a fixing rod, and the adjusting sleeve 270 is provided with a fixing hole extending in the radial direction, and the fixing rod extends into the fixing hole to achieve the connection between the support frame 110 and the adjusting sleeve 270 .

[0041] In some embodiments, the connection seat 310 includes a plurality of enclosures connected to the guide plate 300, the plurality of enclosures are spaced apart, and the plurality of enclosures and the guide plate 300 together form a receiving groove for receiving the second plate 220. The second plate 220 is placed in the receiving groove, and the plate surface of the second plate 220 is pressed against the guide plate 300, thereby achieving the connection between the second plate 220 and the connection seat 310, and the operation is quick and efficient. In other embodiments, the second plate 220 may be circular, the side of the second plate 220 is provided with an external thread, the connection seat 310 is provided with a threaded hole, and the second plate 220 is threadedly connected to the threaded hole, which can also achieve the connection between the second plate 220 and the connection seat 310.

[0042] In some embodiments, the enclosure may be bent or straight. In some embodiments, when the enclosure is bent, the bending angle of the enclosure matches the angle of the second plate 220, for example, the second plate 220 is a rectangle, the bending angle of the enclosure is 90°, or the second plate 220 is a regular pentagon, the bending angle of the enclosure may be 72°. Of course, the first plate 210 and the second plate 220 may both be square structures, and the second plate 220 is welded to the connecting rod 230, which has good stability.

[0043] Based on the same technical concept as the first aspect, an embodiment of the second aspect of the present application provides a hot rolling mill group, characterized in that it includes a telescopic device of any embodiment of the first aspect.

[0044] The hot rolling mill is generally provided with 5 to 7 frames 100, and the entrance and exit of each frame 100 are provided with a guide assembly, the guide assembly includes two guide plates 300, the two guide plates 300 are arranged opposite to each other in the height direction, one is an upper guide plate and the other is a lower guide plate 300, and each guide plate 300 is correspondingly provided with a telescopic device of any embodiment of the first aspect.

[0045] The following uses the guide plate as an example to introduce the installation and disassembly steps of the telescopic device provided in the present application.

[0046] Installation steps:

[0047] 1. After the upper guide plate is inserted, measure the opening size of the connecting seat 310 and the supporting frame 110 and record it;

[0048] 2. Rotate the adjusting sleeve 270 to adjust the length of the telescopic assembly to the opening size, and then rotate the lock nut 280 to fix it to prevent the length of the telescopic assembly from changing, which would affect installation and use;

[0049] 3. Install the telescopic assembly into the corresponding receiving slot and support frame 110;

[0050] 4. Use an open-end wrench to tighten the nuts on the four first plates 210 diagonally in sequence to prevent the spring from being eccentrically stressed and causing the telescopic assembly to run off course and fall off. Stop tightening the nuts when the on-site scraper water sealing state meets the rolling roller gap conditions.

[0051] Disassembly steps:

[0052] 1. Use an open-end wrench to loosen the nuts on the first plate 210 first;

[0053] 2. When the spring is in a free and non-extruded state, use a small hammer to knock the adjusting sleeve 270, and then the telescopic assembly can be taken out;

[0054] 3. After the telescopic assembly is taken out, the rolling mill can perform automatic roll changing operation.

[0055] The telescopic device provided in the present application relies on the adjusting sleeve 270 and the connecting seat 310 as hard support, and is matched with the contraction performance of the mechanical spring to meet the water sealing state of the rolling mill scraper, and can meet the working performance of the analog cylinder.

[0056] The telescopic device of the present application can be installed and used quickly, and the time for dealing with the problem of scraper leakage is short. It can be used stably and sustainably, and the scraper water sealing effect is good. It can be used as an emergency solution for dealing with scraper leakage, and ultimately ensure the stability of scraper water sealing and production line operation. It avoids the problem of internal leakage of the guide plate cylinder on the rolling mill after continuous high-temperature baking in the slab continuous casting and rolling production line, which leads to the solution that the scraper leakage cannot be quickly dealt with.

[0057] After use, the telescopic device of the present application is relatively easy to disassemble. The nut on the first plate 210 is loosened until the spring is no longer squeezed. The telescopic assembly can be taken out after the length of the telescopic assembly is shortened by adjusting the sleeve 270. The time is short and the efficiency is high. The device can be used continuously for 24 hours during production and can be used as an emergency solution for scraper leakage.

[0058] In the headless rolling production line, the upper guide plate cylinder will automatically expand and contract as the thickness of the strip changes, and the heat-resistant temperature of the cylinder body is as high as about 200°C. Common mechanical and hydraulic jacks are rigid devices in the working state, and cannot realize the automatic adjustment function and cannot be continuously heated at a high temperature of 200°C; the expansion device relies on the adjustment sleeve 270 and the support frame 110 as hard support, and combined with the performance of the mechanical spring, it can meet the working performance of the analog cylinder. The self-adjustment function of the mechanical spring can be realized according to the rolling thickness of the strip, and the heat-resistant temperature of the stainless steel spring can be continuously up to about 400°C.

[0059] Since March 2023, the mill has been put into use twice, and the scraper water sealing effect is good. The device can not only achieve quick installation, short processing time, and sustainable use, but also ensure the stability of the mill scraper water sealing; reduce the time for personnel to deal with scraper leakage, and improve the production rhythm and stability of the headless rolling production line. According to the previous two mill shutdown accidents caused by sudden cylinder leakage, the operation of this device can avoid mill shutdown accidents caused by cylinder leakage after it is put into use. It is estimated that 600,000 can be saved by saving two pouring interruption accidents.

[0060] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0064] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A telescopic device for adjusting the guide plate position of a hot rolling mill, characterized in that: include: A connecting seat connected to the guide plate; A support frame installed on the frame of the hot rolling mill; The telescopic assembly includes a first plate, a second plate, a connecting rod, a limit member and an elastic member, wherein the first plate is provided with a through hole, the connecting rod has a first end and a second end, the first end passes through the through hole in a gap and is connected to the limit member, the second end is connected to the second plate, the elastic member is located between the first plate and the second plate, and the two ends act on the first plate and the second plate respectively, the first plate and the second plate are respectively connected to the support frame and the connecting seat.

2. The telescopic device according to claim 1, characterized in that: The elastic member is a spring, and the spring is sleeved outside the connecting rod.

3. The telescopic device according to claim 2, characterized in that: The connecting rods, the limiting members and the springs are each provided in plurality and correspond to each other one by one, and the connecting rods are distributed at intervals.

4. The telescopic device according to claim 3, characterized in that: There are four connecting rods, and the four connecting rods are respectively located at four corners of the same square.

5. The telescopic device according to any one of claims 1 to 4, characterized in that: The connecting rod is provided with an external thread, the limiting member is a nut, and the nut is threadedly connected to the external nut of the first end.

6. The telescopic device according to any one of claims 1 to 4, characterized in that: The telescopic assembly also includes a screw rod and an adjusting sleeve. The screw rod is connected to the first plate. One end of the adjusting sleeve is threadedly connected to the screw rod, and the other end is connected to the support frame.

7. The telescopic device according to claim 6, characterized in that: The telescopic assembly also includes a lock nut threadedly connected to the screw rod, and the lock nut is located between the first plate and the adjusting sleeve.

8. The telescopic device according to claim 6, characterized in that: The support frame is provided with a positioning groove for the adjusting sleeve to extend into and an operating port connected to the positioning groove, wherein the operating port faces upward and is connected to the notch of the positioning groove.

9. The telescopic device according to any one of claims 1 to 4, characterized in that: The connecting seat includes a plurality of enclosures connected to the guide plate, and the plurality of enclosures and the guide plate together form a receiving groove for receiving the second plate member.

10. A hot rolling mill, characterized in that: The invention comprises the telescopic device according to any one of claims 1 to 9.

Images