Solar water heater inner container roll bending forming process
The processing flow of the inner tank of solar water heaters is optimized by using a roll forming device, which integrates the treatment of the reinforcing ribs at the openings and the rounding of the edges. This solves the problem of low efficiency of traditional equipment and improves production efficiency and welding quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YUNNAN YUXI TAIBIAO SOLAR ENERGY EQUIP
- Filing Date
- 2023-02-21
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional rounding equipment has a single function, resulting in many production steps for solar water heater inner tanks, slow efficiency, and the need for manual intervention in multiple processes.
The roll forming device includes a feeding roller, a forming mechanism and a discharging roller. Through the cooperation of the drive shaft and the forming roller shaft, the hole reinforcement rib, pressing line and edge rounding can be completed in one go, reducing manual intervention.
The processing flow of the solar water heater inner tank has been optimized, which has improved production efficiency, reduced the number of processes, adapted to inner tank plates of different thicknesses, and ensured welding quality.
Smart Images
Figure CN116511369B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of solar water heater processing technology, specifically to a rolling forming process for the inner tank of a solar water heater. Background Technology
[0002] The inner tank of a solar water heater is the device used to store water in a solar water heater. It must meet the requirements of heat preservation, pressure resistance, rust prevention, scale prevention, and water tightness. Nowadays, the inner tanks of solar water heaters are mainly made of stainless steel. Its advantages are that the inner tank material is good, the strength is high, the temperature resistance is high, the corrosion resistance is high, the performance is stable, and it is not easy to rust.
[0003] Currently, manufacturing solar water heaters involves multiple steps, including material preparation, punching drainage holes, rolling, welding straight seams, rolling reinforcing ribs at the hole openings, and welding pipe joints. Among these, rolling is a crucial step in the inner tank forming process. Traditional rolling equipment involves workers placing the semi-finished product (after punching drainage holes) into the equipment, then starting the rolling process to roll the semi-finished product. Finally, workers manually unload the rolled product. Because the rolling equipment is limited to the rolling process, subsequent steps such as rolling reinforcing ribs at the hole openings and pressing lines are required, resulting in a complex and inefficient production process for the solar water heater inner tank. Summary of the Invention
[0004] To address the aforementioned problems, this invention provides a solar water heater inner tank roll forming process that features fast roll forming, minimal manual intervention, and optimized inner tank processing flow.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a roll forming process for the inner tank of a solar water heater, comprising the following steps:
[0006] A. Material cutting: Cut materials according to the processing dimensions;
[0007] B. Punching out holes: Punch out holes 1 and overflow holes at the designated positions on the inner liner plate after blanking;
[0008] C. Roll forming: The sheet material after punching the discharge hole 1 is placed on the roll forming device, which includes a feeding roller 2, a forming mechanism and a discharge roller 3 set on the frame. Guide plates 4 are installed on both sides of the feeding roller 2.
[0009] The forming mechanism includes a mounting plate 5, a drive shaft 6, a forming roller shaft 7, a lower forming wheel, an upper forming wheel, an orifice forming wheel 8, and a drive motor 9. The mounting plate 5 is fixedly installed on both sides of the top of the frame. Six rectangular mounting holes are evenly arranged on the mounting plate 5 along the direction of the sheet material travel. The distance between two adjacent mounting holes is 350-500mm. A height adjustment device is installed vertically in the mounting holes.
[0010] The two ends of the drive shaft 6 pass through the lower end of the rectangular mounting holes of the mounting plate 5, and are connected to the drive motor 9 through the drive chain and the drive gear 10. Each drive shaft 6 is fitted with a lower forming wheel on both sides. The lower forming wheel is a frustum with an arc-shaped outer circle, and the profile of the cross-section of the working part is consistent with the outer profile of the sheet metal forming. From the upstream position of the sheet metal traveling direction to the downstream position, the diameter of the frustum-shaped outer circle increases and the width decreases, so that the curvature of the bending increases.
[0011] Two lower drive wheels 11 of the same diameter and width are fitted in the middle; the lower forming wheels on both sides of the No. 1 drive shaft 6 located at the upstream position of the plate travel direction are lower pressing wheels 14, and the lower pressing wheels 14 have a recess at the position opposite to the pressing line 15 on the plate.
[0012] The first drive shaft 6 is also fitted with a hole forming wheel 8 that can rotate relative to it. The hole forming wheel 8 is located on the drive shaft 6 and is opposite to the row hole 1 on the inner liner plate. Both ends of its circumferential surface are provided with annular protrusions 12, and the distance between the two is slightly larger than the diameter distance of the row hole 1.
[0013] The two ends of the forming roller shaft 7 pass through the upper part of the rectangular mounting holes of the mounting plate 5, and the height is adjusted by the height adjustment device. Each forming roller shaft 7 is located above the drive shaft 6. The upper forming roller shaft 7 is fitted with upper forming rollers on both sides, which are opposite to the lower forming rollers. The upper forming rollers are frustum-shaped with an arc-shaped outer circle, and the profile of the cross-section of the working part is consistent with the outer profile of the sheet material forming. From the upstream position of the sheet material traveling direction to the downstream position, the diameter of the frustum-shaped outer circle increases and the width decreases, and the sheet material cannot contact the forming roller shaft 7. The lower forming roller and the upper forming roller located on the same mounting hole are a set of bending rollers. The arc-shaped surfaces of the same set of bending rollers face each other, and an arc gap is formed between the circumferences. The bending of the material at the beginning and the end uses a smaller bending angle, and the bending of the middle part uses a larger bending angle.
[0014] An upper drive wheel 11-1, opposite to the lower drive wheel 11, is fitted in the middle. The diameter of the upper drive wheel 11-1 is the same as that of the upper forming wheel. The end of the first forming roller shaft 7, located upstream in the direction of material travel, which passes through the mounting hole, is equipped with a gear that meshes with the drive gear 10 on the first drive shaft 6 to transmit power. The upper pressure roller 14-1, positioned opposite the pressure line 15 on the material, has protrusions, recesses, and protrusions that roll out of the pressure line 15 on the material.
[0015] The No. 1 forming roller shaft 7 is also fitted with a hole forming wheel 8 that has the same shape and size as the hole forming wheel 8 on the No. 1 transmission shaft 6 and is rolled together to form a vertically opposite form to roll up reinforcing ribs on both sides of the hole 1. The width of the annular convex line 12 is the width of the reinforcing rib 13.
[0016] To avoid friction and damage to the workpiece surface, the orifice forming wheel 8, the lower pressing wheel 14, and the upper pressing wheel 14-1 are made of alloy steel with polished surfaces, while the remaining lower forming wheels and upper forming wheels are made of steel with polyurethane rubber coating.
[0017] The aforementioned forming wheel 8, lower drive wheel 11, upper drive wheel 11-1, lower pressing wheel 14, upper pressing wheel 14-1, lower forming wheel, upper forming wheel and their respective mounting shafts are provided with corresponding bushings 16.
[0018] Forming steps on the roll forming device:
[0019] C1. Pressing and rolling reinforcing ribs: The inner liner sheet enters the forming mechanism between the first drive shaft 6 and the first forming roller shaft 7 along the feeding roller 2. Since both shafts are driven by the drive motor 9, the inner liner sheet can be rolled between the two shafts in time. The annular convex line 12 on the orifice forming wheel 8 rolls the raised reinforcing ribs 13 on both sides of the upper row of holes 1 on the inner liner sheet. The lower pressing wheel 14 and the upper pressing wheel 14-1 roll out the pressing line 15 on the sheet.
[0020] C2. Edge Rounding: The inner liner sheet then enters each rolling roller group in sequence. Under the combined action of the arc surface of the second rolling roller group, the two ends of the inner liner sheet are bent upwards by 13°. Under the combined action of the arc surface of the third rolling roller group, the two ends of the inner liner sheet are bent upwards by 25°. Under the combined action of the arc surface of the fourth rolling roller group, the two ends of the inner liner sheet are bent upwards by 35°. Under the combined action of the arc surface of the fifth rolling roller group, the two ends of the inner liner sheet are bent upwards by 42°. Under the combined action of the arc surface of the sixth rolling roller group, the two ends of the inner liner sheet are bent upwards by 48°.
[0021] C3. The rounded sheet material is discharged along discharge roller 3:
[0022] D. Welding straight seams and pipe joints: Ensure uniform welding, no missed welds, and no leaks in the welded parts.
[0023] Preferably, the height adjustment device of the roll forming device includes a support plate 21, an adjusting bolt 22, and an adjusting nut 23. The top surface length of the support plate 21 is greater than the top surface length of the mounting hole, and the bottom surface length is the same as the top surface length of the mounting hole. A screw hole is provided in the middle of the end face of the support point. The bottom surface of the support plate 21 is engaged with the top surface of the mounting hole. Both ends of its top surface are fixed to the side plates of the mounting hole by bolts. The bottom end of the adjusting bolt 22 is fixed to the middle of the top surface of the mounting plate 5, and the top end protrudes out of the screw hole of the support plate 21. The adjusting nut 23 is sleeved on the part of the adjusting bolt 22 that protrudes out of the support plate 21.
[0024] To facilitate the collection of the number of processed workpieces, a counting sensor 18 is installed at the feed end of the feed roller 2.
[0025] Beneficial effects: ① In this invention, corresponding orifice forming wheels 8 are set on the first transmission shaft 6 and the first forming roller shaft 7 of the forming mechanism. There are recesses and protrusions between the lower pressing wheel 14 and the upper pressing wheel 14-1. While feeding, the reinforcing ribs 13 on both sides of the orifice forming wheel 8 roll out the hole 1. The recesses and protrusions work together to press the lines on both sides of the plate, which makes it easier to control the overlap width and further control the circumference to form a complete cylinder.
[0026] ② Other drive shafts 6 and forming roller shafts 7 are equipped with a rolling bending roller group consisting of a lower forming roller and an upper forming roller with progressively larger diameters and progressively smaller widths. This group can achieve one-time feeding roller pressing of the hole reinforcement ribs, pressing lines, and edge rounding, thus optimizing the process flow of the solar water heater inner tank to: feeding - punching holes - rolling forming - welding straight seams - welding pipe joints; reducing the number of processes and improving production efficiency.
[0027] ③ Because the gap between the lower forming roller and the upper forming roller on each set of drive shaft 6 and forming roller shaft 7 can be adjusted, it is suitable for inner liner plates of different thicknesses; the guide plate 4 keeps the plate to be processed moving smoothly and without twisting. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the process flow of the present invention.
[0029] Figure 2 This is a three-dimensional structural diagram of the roll forming device of the present invention.
[0030] Figure 3 This is a schematic diagram of the molding mechanism of the present invention.
[0031] Figure 4 for Figure 2 A magnified structural diagram of point A in the middle.
[0032] Figure 5 This is a schematic diagram of the workpiece structure after molding.
[0033] Figure 6 This is a schematic diagram of the cross-section of each of the rolling bending wheels.
[0034] Figure 7 This is a schematic diagram of the forming cross section between the lower pressing wheel 14 and the upper pressing wheel 14-1.
[0035] In the diagram: 1. Drill hole; 2. Feed roller; 3. Discharge roller; 4. Guide plate; 5. Mounting plate; 6. Drive shaft; 7. Forming roller shaft; 8. Orifice forming wheel; 9. Drive motor; 10. Drive gear; 11. Lower drive wheel; 11-1 upper drive wheel; 12. Annular convex line; 13. Reinforcing rib; 14. Lower pressing wheel; 14-1 upper pressing wheel; 15. Pressing line; 16. Bushing; 18. Counting sensor; 21. Support plate; 22. Adjusting bolt; 23. Adjusting nut. Detailed Implementation
[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example
[0037] A process for forming the inner tank of a solar water heater by roll bending includes the following steps:
[0038] A. Material cutting: Cut materials according to the processing dimensions;
[0039] B. Punching out holes: Punch out holes 1 and overflow holes at the designated positions on the inner liner plate after blanking;
[0040] C. Roll forming: The sheet material after punching the discharge hole 1 is placed on the roll forming device. The roll forming device includes a feeding roller 2, a forming mechanism and a discharge roller 3 set on the frame. The feeding roller 2 is equipped with a counting sensor 18 at the feeding end and guide plates 4 are installed on both sides.
[0041] The forming mechanism includes a mounting plate 5, a drive shaft 6, a forming roller shaft 7, a lower forming wheel, an upper forming wheel, an orifice forming wheel 8, and a drive motor 9. The mounting plate 5 is fixedly installed on both sides of the top of the frame. Six rectangular mounting holes are evenly arranged on the mounting plate 5 along the direction of material travel, with a spacing of 350mm between adjacent mounting holes. A height adjustment device is installed vertically in each mounting hole. The height adjustment device includes a support plate 21, an adjusting bolt 22, and an adjusting nut 23. The top surface length of the support plate 21 is greater than the top surface length of the mounting hole, and the bottom surface length is the same as the top surface length of the mounting hole. A screw hole is opened in the middle of the end face of the support point. The bottom surface of the support plate 21 engages with the top surface of the mounting hole, and both ends of its top surface are fixed to the side plates of the mounting hole by bolts. The bottom end of the adjusting bolt 22 is fixed to the middle of the top surface of the mounting plate 5, and the top end protrudes out of the screw hole of the support plate 21. The adjusting nut 23 is sleeved on the part of the adjusting bolt 22 that protrudes out of the support plate 21.
[0042] The two ends of the drive shaft 6 pass through the lower ends of the rectangular mounting holes of the mounting plate 5, and are connected to the drive motor 9 through the drive chain and the drive gear 10. Each drive shaft 6 is fitted with a lower forming wheel on both sides. The lower forming wheel is a frustum with an arc-shaped outer circle, and the profile of the cross-section of the working part is consistent with the outer profile of the sheet metal forming. From the upstream position of the sheet metal traveling direction to the downstream position, the diameter of the frustum outer circle increases and the width decreases, so that the curvature of the bending increases.
[0043] Two lower drive wheels 11 of the same diameter and width are fitted in the middle; lower pressure rollers 14 are provided on both sides of the first drive shaft 6 located at the upstream position of the plate travel direction, and the lower pressure rollers 14 have a recess at the position opposite to the pressure line 15 on the plate.
[0044] The first drive shaft 6 is also fitted with a hole forming wheel 8 that can rotate relative to it. The hole forming wheel 8 is located on the drive shaft 6 and is opposite to the row hole 1 on the inner liner plate. Both ends of its circumferential surface are provided with annular protrusions 12, and the distance between the two is slightly larger than the diameter distance of the row hole 1.
[0045] The two ends of the forming roller shaft 7 pass through the upper part of the rectangular mounting holes of the mounting plate 5, and the height is adjusted by the height adjustment device to form a gap between the upper and lower rollers. Each forming roller shaft 7 is located above the transmission shaft 6. Upper forming rollers are sleeved on both sides of the forming roller shaft 7, which are opposite to the lower forming rollers. The upper forming rollers are frustum-shaped with an arc-shaped outer circle, and the profile of the cross-section of the working part is consistent with the outer profile of the sheet forming. From the upstream position of the sheet traveling direction to the downstream position, the diameter of the frustum-shaped outer circle increases and the width decreases, and the sheet cannot contact the forming roller shaft 7. The lower forming roller and the upper forming roller located on the same mounting hole are a set of bending rollers. The arc-shaped surfaces of the same set of bending rollers face each other, and an arc-shaped gap is formed between the circumferences. The bending of the material at the beginning and the end uses a smaller bending angle, and the bending of the middle part uses a larger bending angle.
[0046] An upper drive wheel 11-1, opposite to the lower drive wheel 11, is fitted in the middle. The diameter of the upper drive wheel 11-1 is the same as that of the upper forming wheel. The end of the first forming roller shaft 7, located upstream in the direction of material travel, which passes through the mounting hole, is equipped with a gear that meshes with the drive gear 10 on the first drive shaft 6 to transmit power. The upper pressure roller 14-1, positioned opposite the pressure line 15 on the material, has protrusions, recesses, and protrusions that roll out of the pressure line 15 on the material.
[0047] The No. 1 forming roller 7 is also fitted with a hole forming wheel 8 that has the same shape and size as the hole forming wheel 8 on the No. 1 transmission shaft 6 and is rolled together to form a vertically opposite form to roll up reinforcing ribs on both sides of the hole 1. The width of the annular convex line 12 is the width of the reinforcing rib 13.
[0048] The orifice forming wheel 8, the lower pressing wheel 14, and the upper pressing wheel 14-1 are made of alloy steel with polished surfaces, while the remaining lower forming wheels and upper forming wheels are made of steel wheels with polyurethane rubber coating.
[0049] The aforementioned forming wheel 8, lower drive wheel 11, upper drive wheel 11-1, lower pressing wheel 14, upper pressing wheel 14-1, lower forming wheel, upper forming wheel and their respective mounting shafts are provided with corresponding bushings 16.
[0050] Forming steps on the roll forming device:
[0051] C1. Pressing and rolling reinforcing ribs: The inner liner sheet enters the forming mechanism between the first drive shaft 6 and the first forming roller shaft 7 along the feeding roller 2. Since both shafts are driven by the drive motor 9, the inner liner sheet can be rolled between the two shafts in time. The annular convex line 12 on the orifice forming wheel 8 rolls the raised reinforcing ribs 13 on both sides of the upper row of holes 1 on the inner liner sheet. The lower pressing wheel 14 and the upper pressing wheel 14-1 roll out the pressing line 15 on the sheet.
[0052] C2. Edge Rounding: The inner liner sheet then enters each rolling roller group in sequence. Under the combined action of the arc surface of the second rolling roller group, the two ends of the inner liner sheet are bent upwards by 13°. Under the combined action of the arc surface of the third rolling roller group, the two ends of the inner liner sheet are bent upwards by 25°. Under the combined action of the arc surface of the fourth rolling roller group, the two ends of the inner liner sheet are bent upwards by 35°. Under the combined action of the arc surface of the fifth rolling roller group, the two ends of the inner liner sheet are bent upwards by 42°. Under the combined action of the arc surface of the sixth rolling roller group, the two ends of the inner liner sheet are bent upwards by 48°.
[0053] C3. The rounded sheet material is discharged along discharge roller 3:
[0054] D. Welding straight seams and pipe joints: Ensure uniform welding, no missed welds, and no leaks in the welded parts. Example
[0055] The specific structure and implementation method are the same as in Example 1, except that: 6 rectangular mounting holes are evenly arranged on the mounting plate 5 along the direction of the plate's movement, and the distance between two adjacent mounting holes is 500mm.
Claims
1. A process for forming the inner tank of a solar water heater by roll bending, comprising the following steps: A. Material cutting: Cut materials according to the processing dimensions; B. Punching out holes: Punching out holes (1) at designated positions on the inner liner plate after blanking, and punching overflow holes; The feature is that it also includes, C, roll forming: the plate after punching out holes (1) is placed on a roll forming device, the roll forming device includes a feeding roller (2), a forming mechanism and a discharge roller (3) set on the frame, and guide plates (4) are respectively installed on both sides of the feeding roller (2). The forming mechanism includes a mounting plate (5), a drive shaft (6), a forming roller shaft (7), a lower forming wheel, an upper forming wheel, a hole forming wheel (8), and a drive motor (9). The mounting plate (5) is fixedly installed on both sides of the top of the frame. Six rectangular mounting holes are evenly arranged on the mounting plate (5) along the direction of the plate's movement. The distance between two adjacent mounting holes is 350-500mm. A height adjustment device is installed vertically in the mounting holes. The two ends of the drive shaft (6) pass through the lower end of the rectangular mounting hole of the mounting plate (5) and are connected to the drive motor (9) through the drive chain and drive gear (10). Each drive shaft (6) is fitted with a lower forming wheel on both sides. The lower forming wheel is a frustum with an arc-shaped outer circle, and the profile of the cross-section of the working part is consistent with the outer profile of the plate forming. From the upstream position of the plate traveling direction to the downstream position, the diameter of the frustum outer circle increases and the width decreases, so that the curvature of the bend increases. Two lower drive wheels (11) of the same diameter and width are provided in the middle; the lower forming wheels on both sides of the No. 1 drive shaft (6) located at the upstream position of the plate travel direction are lower pressing wheels (14), and the lower pressing wheels (14) are provided with a recess at the position opposite to the pressing line (15) on the plate; The first drive shaft (6) is also fitted with a hole forming wheel (8) that can rotate relative to each other. The hole forming wheel (8) is located on the drive shaft (6) and is opposite to the row hole (1) on the inner liner plate. Both ends of its circumferential surface are provided with annular convex lines (12), and the distance between the two is slightly greater than the diameter distance of the row hole (1). The two ends of the forming roller shaft (7) pass through the upper part of the rectangular mounting hole of the mounting plate (5), and the height is adjusted by the height adjustment device. Each forming roller shaft (7) is located above the transmission shaft (6). The upper forming roller shaft (7) is fitted with an upper forming roller on both sides, which is opposite to the lower forming roller. The upper forming roller is a frustum with an arc-shaped outer circle, and the profile of the cross section of the working part is consistent with the outer profile of the plate forming. From the upstream position of the plate traveling direction to the downstream position, the diameter of the frustum outer circle increases and the width decreases, and the plate cannot contact the forming roller shaft (7). The lower forming roller and the upper forming roller located on the same mounting hole are a set of bending rollers. The arc surfaces of the same set of bending rollers are opposite each other, and an arc gap is formed between the circumferences. The bending of the material in the beginning and the last part adopts a smaller bending angle, and the bending of the middle part adopts a larger bending angle. An upper drive wheel (11-1) is provided in the middle, which is opposite to the lower drive wheel (11). The diameter of the upper drive wheel (11-1) is the same as that of the upper forming wheel. The end of the first forming roller shaft (7) located upstream of the plate travel direction is provided with a gear that meshes with the drive gear (10) on the first drive shaft (6) to transmit power. The upper pressing wheel (14-1) is provided with a protrusion at the position opposite to the pressing line (15) on the plate. The depression and the protrusion roll out of the pressing line (15) on the plate. The No. 1 forming roller (7) is also fitted with a hole forming wheel (8) that is the same in shape and size as the hole forming wheel (8) on the No. 1 transmission shaft (6) and is rolled together to form a vertically opposite form to roll up the reinforcing ribs on both sides of the hole (1). The width of the annular convex line (12) is the width of the reinforcing rib (13). Forming steps on the roll forming device: C1. Pressing and rolling reinforcing ribs: The inner liner plate enters between the first drive shaft (6) and the first forming roller shaft (7) of the forming mechanism along the feeding roller (2). Since both shafts are driven by the drive motor (9), the inner liner plate can be rolled between the two shafts in time. The annular convex line (12) on the orifice forming wheel (8) rolls the reinforcing ribs (13) on both sides of the upper row of holes (1) of the inner liner plate. The lower pressing wheel (14) and the upper pressing wheel (14-1) roll out the pressing line (15) on the plate. C2. Edge Rounding: The inner liner sheet then enters each rolling roller group in sequence. Under the combined action of the arc surface of the second rolling roller group, the two ends of the inner liner sheet are bent upward by 13°. Under the combined action of the arc surface of the third rolling roller group, the two ends of the inner liner sheet are bent upward by 25°. Under the combined action of the arc surface of the fourth rolling roller group, the two ends of the inner liner sheet are bent upward by 35°. Under the combined action of the arc surface of the fifth rolling roller group, the two ends of the inner liner sheet are bent upward by 42°. Under the combined action of the arc surface of the sixth rolling roller group, the two ends of the inner liner sheet are bent upward by 48°. C3. The rounded sheet material is discharged along the discharge roller (3); D. Welding straight seams and pipe joints: Ensure uniform welding, no missed welds, and no leaks in the welded parts.
2. The roll forming process for the inner tank of a solar water heater according to claim 1, characterized in that: The orifice forming wheel (8), the lower pressing wheel (14), and the upper pressing wheel (14-1) are made of alloy steel with polished surfaces, while the remaining lower forming wheels and upper forming wheels are made of steel with polyurethane rubber coating.
3. The roll forming process for the inner tank of a solar water heater according to claim 1, characterized in that: A counting sensor (18) is installed at the feed end of the feed roller (2).
4. The roll forming process for the inner tank of a solar water heater according to claim 2, characterized in that: A counting sensor (18) is installed at the feed end of the feed roller (2).
5. The roll forming process for the inner tank of a solar water heater according to any one of claims 1-4, characterized in that: The height adjustment device of the roll forming device includes a support plate (21), an adjusting bolt (22) and an adjusting nut (23). The top surface length of the support plate (21) is greater than the top surface length of the mounting hole, and the bottom surface length is the same as the top surface length of the mounting hole. A screw hole is provided in the middle of the end face of the support plate. The bottom surface of the support plate (21) is engaged with the top surface of the mounting hole. Both ends of its top surface are fixed to the side plates of the mounting hole by bolts. The bottom end of the adjusting bolt (22) is fixed to the middle of the top surface of the mounting plate (5), and the top end protrudes out of the screw hole of the support plate (21). The adjusting nut (23) is sleeved on the part of the adjusting bolt (22) that protrudes out of the support plate (21).