Ultraviolet curing repair equipment for municipal pipelines

Abstract

The utility model relates to an ultraviolet curing repair device for municipal pipelines. The equipment comprises an ultraviolet lamp tube support, the ultraviolet lamp tube support comprises two fixing discs, supporting rods, fixing nuts and ultraviolet lamp tubes, the two fixing discs are arranged in the left-right direction at intervals, the multiple ultraviolet lamp tubes are arranged between the two fixing discs in the circumferential direction in an array mode, and the two ends of each supporting rod penetrate through the fixing discs on the corresponding sides respectively. A fixing nut is screwed at the end part of the supporting rod so as to clamp and fix the ultraviolet lamp tube between the two fixing discs, the left end and the right end of the ultraviolet lamp tube bracket are respectively provided with a group of supporting and walking mechanisms, each walking support comprises a movable seat fixed with the fixing discs, a plurality of supporting arms with adjustable inclination angles are hinged on the movable seat, and the movable seat is connected with the ultraviolet lamp tube bracket. And rollers are arranged at the end parts, back on to the movable seat, of the support arms. By unscrewing the fixing nuts, the two fixing discs can be separated outwards, and the ultraviolet lamp tube can be disassembled and assembled without integrally disassembling the ultraviolet lamp tube bracket, so that the replacement process is simplified, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ultraviolet light curing repair equipment, and specifically relates to a municipal pipeline ultraviolet light curing repair equipment. BACKGROUND

[0002] Early laid municipal pipelines inevitably have problems such as aging, damage and corrosion due to reasons such as increasing service life, poor material quality and complex buried environment, which affect the normal operation of the city, and generally use ultraviolet light curing repair equipment to repair the inner wall of the municipal pipeline.

[0003] Specifically, the hose liner for maintenance is impregnated with resin and pulled into the municipal pipeline, and the hose liner is inflated and adhered to the inner wall of the municipal pipeline to be repaired by using the inflation equipment. The ultraviolet light repair equipment is pulled into the hose liner, and the equipment is slowly moved along the inner wall of the hose liner by traction, and the ultraviolet light emitted by the ultraviolet light repair equipment on the ultraviolet light repair equipment solidifies the resin on the hose liner during movement, so that the hose liner is adhered and fixed to the inner wall of the municipal pipeline, thereby achieving the effect of repairing the municipal pipeline.

[0004] The existing ultraviolet light repair equipment generally includes a middle ultraviolet lamp bracket, and a plurality of ultraviolet lamp tubes are fixed on the ultraviolet lamp bracket in a circumferential direction. A set of support walking mechanisms is arranged at both ends of the ultraviolet lamp bracket, and the support wheels on the support walking mechanisms abut against the inner wall of the pipeline to allow the ultraviolet light repair equipment to move along the pipeline for repair work.

[0005] The existing ultraviolet light repair equipment generally has high overall integration, and the ultraviolet lamp bracket and the ultraviolet lamp tube form an integral whole. However, during the operation process, the ultraviolet lamp tube is often damaged and needs to be replaced. When the single ultraviolet lamp tube of the existing ultraviolet light repair equipment is damaged, the support walking mechanisms at both ends of the ultraviolet lamp bracket need to be disassembled, the single ultraviolet lamp tube needs to be replaced, and then the support walking mechanisms need to be installed and the operation continues. However, the overall operation is complicated, it is not convenient for quick disassembly and replacement of the ultraviolet lamp tube, and it is not conducive to efficient operation. INVENTION CONTENTS

[0006] The technical problem to be solved by the utility model is to provide a municipal pipeline ultraviolet light curing repair equipment, which can separate the two fixing discs outward by unscrewing the fixing nuts, without disassembling the ultraviolet lamp bracket as a whole, so that the ultraviolet lamp tube can be disassembled and assembled, the replacement process is simplified, and the operation efficiency is improved.

[0007] In view of the above technical problems, the utility model provides a technical scheme of a municipal pipeline ultraviolet light curing repair equipment, including ultraviolet lamp support, the ultraviolet lamp support includes fixed disc, support rod, fixed nut and ultraviolet lamp tube, the fixed disc is arranged two in the left and right directions interval, the ultraviolet lamp tube is arranged multiple along the circumference array between two fixed discs, the both ends of support rod respectively pass through the fixed disc of corresponding side, the fixed nut is screwed in the end of support rod, with the ultraviolet lamp tube is clamped and fixed between two fixed discs, the left and right ends of ultraviolet lamp support are provided with a set of support walking mechanism respectively, the walking support includes the mobile seat of with fixed disc, the mobile seat is hinged with a plurality of adjustable inclination angle's support arm, the end of the support arm back to the mobile seat is provided with the gyro wheel.

[0008] Further, the position of the support rod near the end is provided with a baffle disc, and the baffle disc is in abutment with the inner side of the fixed disc.

[0009] Further, the support rod is arranged multiple along the circumference array on the fixed disc, and the support rod is arranged between the adjacent ultraviolet lamp tubes.

[0010] Further, the support rod is a telescopic rod.

[0011] Further, the inner side of the fixed disc is provided with a clamping groove corresponding to the position of the ultraviolet lamp tube, and the end of the ultraviolet lamp tube is inserted into the clamping groove.

[0012] Further, the mobile seat is connected with the fixed disc through a connecting column, and the diameter of the connecting column and the mobile seat is smaller than the diameter of the fixed disc.

[0013] Further, the end of the support arm towards the mobile seat is hingedly connected with the mobile seat, and a telescopic support is arranged between the middle of the support arm and the mobile seat, and the both ends of the telescopic support are hingedly connected with the support arm and the mobile seat respectively.

[0014] Further, the telescopic support includes a support sleeve and a sliding rod arranged in the support sleeve, the opposite ends of the support sleeve and the sliding rod are hingedly connected with the mobile seat and the support arm respectively, a fastening bolt is threadedly connected with the circumferential surface of the support sleeve and extends into the inside of the support sleeve, and a plurality of screw holes corresponding to the fastening bolt are arranged on the sliding rod along the length direction of the sliding rod.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] (1) The ultraviolet lamp is clamped between the two fixed discs through the support rod and the fixed nut. When a single ultraviolet lamp is damaged, only the fixed nut needs to be loosened, and the ultraviolet lamp can be separated. The damaged ultraviolet lamp can be taken out and replaced without the need to disassemble the support and walking mechanism as a whole, and the connection between the ultraviolet lamp support and the support and walking support does not need to be damaged. The replacement process is simplified, and the work efficiency is improved. At the same time, the support arm of the support and walking mechanism can adjust the inclination angle, and the roller at the end thereof can adjust the contact state with the inner wall of the pipeline according to the diameter of the pipeline. For municipal pipelines with different diameters, the inclination angle of the support arm is adjusted so that the roller tightly abuts against the inner wall of the pipeline, thereby ensuring the smooth movement of the equipment in the pipeline and enhancing the universality and adaptability of the equipment.

[0017] (2) The stop disc is arranged on the support rod, and the stop disc and the fixed disc are matched to prevent the fixed disc from shaking with the support rod, thereby ensuring the accurate fixing position of the ultraviolet lamp and increasing the stability of the overall structure of the ultraviolet lamp support.

[0018] (3) A plurality of support rods are arranged between adjacent ultraviolet lamps in a circumferential array. On the one hand, the support rods and the ultraviolet lamps are prevented from interfering with each other, the normal emission of ultraviolet light is ensured, and stable support and positioning are provided for the ultraviolet lamps, so that the ultraviolet lamps can maintain the correct position and posture during the repair process, and the ultraviolet light can uniformly irradiate the resin material on the inner wall of the pipeline, thereby improving the repair quality.

[0019] On the other hand, this layout enhances the connection strength between the fixed discs and the uniform stress, so that the ultraviolet lamp support can withstand greater external force, improves the reliability of the equipment in complex pipeline environments, reduces the number of maintenance due to structural damage, and further improves the work efficiency.

[0020] (4) The support rod is a telescopic rod, so that the ultraviolet lamp support is adapted to ultraviolet lamps of different lengths, is suitable for municipal pipelines with different length requirements and operation requirements, improves the practicability, and expands the application range.

[0021] (5) The clamping groove on the inner side of the fixed disc can precisely position the ultraviolet lamp, so that the ultraviolet lamp is accurately installed at the predetermined position, and the ultraviolet light is uniformly irradiated to the inner wall of the pipeline. At the same time, the clamping effect of the clamping groove enhances the installation stability of the ultraviolet lamp, prevents the ultraviolet lamp from shaking or shifting during the movement of the equipment, and improves the consistency of the repair effect.

[0022] (6) The diameter of the connecting column and the moving seat is smaller than the diameter of the fixed disc, so that the support and walking mechanism does not interfere with the inner wall of the pipeline when moving in the pipeline, and the support rod does not interfere with the connecting column and the moving seat, thereby facilitating the disassembly and assembly of the ultraviolet lamp.

[0023] (7) By telescopic support telescopic, can conveniently adjust the inclination angle of the arm, thereby quickly adapt to different pipe diameter pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the overall structure of the ultraviolet light curing repair equipment in the embodiment 1 of the utility model Figure One .

[0025] Figure 2 is the overall structure of the ultraviolet light curing repair equipment in the embodiment 1 of the utility model Figure Two .

[0026] Figure 3 is the overall structure of the ultraviolet light curing repair equipment in the embodiment 1 of the utility model Figure Three .

[0027] Figure 4 is the overall structure of the ultraviolet light curing repair equipment in the embodiment 1 of the utility model Figure Four .

[0028] Figure 5 is the structure diagram of the support rod in the embodiment 2 of the utility model.

[0029] Figure 6 is the partial sectional view of the support rod in the embodiment 2 of the utility model.

[0030] In the drawing: 1, mobile seat; 2, arm; 3, roller; 4, connecting column; 5, fixed disc; 6, support rod; 7, ultraviolet lamp; 8, baffle disc; 9, fixed nut; 10, clamping groove; 11, telescopic support; 12, support sleeve; 13, sliding rod; 14, fastening bolt; 15, traction ring; 16, ultraviolet lamp support; 17, support walking mechanism; 18, support cylinder; 19, through rod; 20, fixed bolt; 21, sliding groove. DETAILED DESCRIPTION

[0031] To make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application: Specific embodiment 1:

[0033] As Figure 1 shown, in the embodiment, the length direction of ultraviolet lamp support 16 is set as left-right direction.

[0034] Reference Figures 1 to 6This utility model discloses a municipal pipeline ultraviolet curing repair device (hereinafter referred to as the ultraviolet curing repair device), which includes an ultraviolet lamp support 16. The ultraviolet lamp support 16 includes a fixed plate 5, a support rod 6, a fixing nut 9, and ultraviolet lamps 7. Specifically, the fixed plate 5 is disc-shaped, and two fixed plates 5 are arranged at intervals in the left-right direction. Multiple ultraviolet lamps 7 are arranged in a circumferential array between the two fixed plates 5 along the axis of the fixed plates 5, and the ultraviolet lamps 7 are arranged close to the outer periphery of the fixed plates 5.

[0035] Both ends of the support rod 6 are provided with threaded sections. The two threaded sections pass through the corresponding fixing plates 5. The fixing nut 9 is screwed onto the threaded section at the end of the support rod 6 to fix the support rod 6 onto the fixing plate 5. At the same time, the ultraviolet lamp tube 7 is clamped and fixed between the two fixing plates 5.

[0036] like Figure 1 As shown, a set of support walking mechanism 17 is provided at the left and right ends of the ultraviolet lamp tube bracket 16. The walking support includes a movable seat 1 fixed to the fixed plate 5. Several adjustable tilt angle support arms 2 are hinged on the movable seat 1, and the multiple support arms 2 are arranged in a circumferential array along the movable seat 1. Rollers 3 are provided at the ends of the support arms 2 facing away from the movable seat 1. The rollers 3 are used to support the inner wall of the pipe.

[0037] This configuration, using the support rod 6 and the fixing nut 9, clamps the UV lamp 7 between the two fixing plates 5. When a single UV lamp 7 is damaged, loosening the fixing nut 9 releases the clamping lock between the fixing plate 5 and the UV lamp 7, allowing the two fixing plates 5 to be separated outwards to remove the UV lamp 7. This eliminates the need to damage the connection between the UV lamp bracket 16 and the supporting walking mechanism 17, and avoids the need to completely disassemble the UV lamp bracket 16, simplifying the replacement process and improving work efficiency.

[0038] Meanwhile, the support arm 2 of the walking mechanism 17 has an adjustable tilt angle, and the roller 3 at its end can adjust its contact state with the inner wall of the pipe according to the pipe diameter. For municipal pipelines of different diameters, by adjusting the tilt angle of the support arm 2, the roller 3 is made to closely abut against the inner wall of the pipe, ensuring that the equipment moves smoothly inside the pipe and enhancing the versatility and adaptability of the equipment.

[0039] Preferably, in this embodiment, such as Figure 3 As shown, a baffle 8 is provided near the end of the support rod 6. The baffle 8 is located inside the fixed plate 5. Both ends of the support rod 6 pass through the fixed plate 5. When the fixing nut 9 is tightened, the baffle 8 engages with the inner side of the fixed plate 5 to fix the fixed plate 5 onto the baffle 8 of the support rod 6. This achieves the installation of the ultraviolet lamp tube bracket 16.

[0040] The arrangement can ensure the fixing stability of the fixing disc 5 and the support rod 6, prevent the shaking between the fixing disc 5 and the support rod 6, ensure the accurate fixing position of the ultraviolet lamp tube 7, and increase the stability of the overall structure of the ultraviolet lamp tube support 16. Of course, in other embodiments, the blocking disc 8 can not be arranged when the actual use requirements are met, at this time, the diameter of the middle rod body of the support rod 6 is greater than the diameter of the threaded segment at the end, the step between the middle rod body and the threaded segment is used to block the fixing disc 5, and the locking and fixing are realized.

[0041] Preferably, in the embodiment, a plurality of support rods 6 are arranged in a circumferential array on the fixing disc 5, and the support rods 6 are arranged between adjacent ultraviolet lamp tubes 7. Specifically, in the embodiment, as shown in Figure 2 、 3 , the ultraviolet lamp tubes 7 are arranged in a circumferential array of 8, the support rods 6 are arranged in a circumferential array of 4, and the circle of the annular array of the support rods 6 coincides with the circle of the annular array of the ultraviolet lamp tubes 7.

[0042] The arrangement can avoid the mutual interference between the support rod 6 and the ultraviolet lamp tube 7, ensure the normal emission of ultraviolet light, provide stable support and positioning for the ultraviolet lamp tube 7, ensure that the ultraviolet lamp tube 7 maintains the correct position and posture during the repair process, ensure that the ultraviolet light can uniformly irradiate the resin material on the inner wall of the pipeline, and improve the repair quality. On the other hand, the layout enhances the connection strength between the fixing discs 5 and the uniform stress, so that the ultraviolet lamp tube support 16 can withstand greater external force, improves the reliability of the equipment in complex pipeline environments, reduces the maintenance frequency caused by structural damage, and further improves the operation efficiency.

[0043] Preferably, in the embodiment, as shown in Figure 4 , a clamping groove 10 adapted to the end of the ultraviolet lamp tube 7 is arranged on the inner side of the fixing disc 5 corresponding to the position of the ultraviolet lamp tube 7, and the end of the ultraviolet lamp tube 7 is inserted into the clamping groove 10. The arrangement can use the clamping groove 10 to accurately position the ultraviolet lamp tube 7, so that the ultraviolet lamp tube 7 is accurately installed at the predetermined position, and the ultraviolet light can uniformly irradiate the inner wall of the pipeline. At the same time, the clamping effect of the clamping groove 10 enhances the installation stability of the ultraviolet lamp tube 7, prevents it from shaking or shifting during the movement of the equipment, and improves the consistency of the repair effect. And the clamping assembly is convenient for replacing the ultraviolet lamp tube 7.

[0044] In the embodiment, preferably, a connecting column 4 is connected between the moving seat 1 and the fixing disc 5, and the diameters of the connecting column 4 and the moving seat 1 are smaller than the diameter of the fixing disc 5. On the one hand, this facilitates the assembly of the support walking mechanism 17 and the ultraviolet lamp tube support 16, and on the other hand, the support walking mechanism 17 will not interfere with the inner wall of the pipeline when moving in the pipeline, and at the same time, the support rod 6 will not interfere with the connecting column 4 and the moving seat 1, which facilitates the disassembly and assembly of the ultraviolet lamp tube 7.

[0045] In the embodiment, specifically, the end of the arm 2 towards the moving base 1 is hingedly connected with the moving base 1, specifically, a hinge seat is arranged at the corresponding position of the moving base 1, and the inner end of the arm 2 is hingedly connected with the hinge seat. A telescopic support 11 is arranged between the middle of the arm 2 and the moving base 1, and the two ends of the telescopic support 11 are hingedly connected with the arm 2 and the moving base 1 respectively. And the telescopic support 11 is specifically arranged on the side of the arm 2 away from the connecting column 4.

[0046] Specifically, as shown in Figure 1 , 4 The telescopic support 11 includes a support sleeve 12 and a sliding rod 13 slidingly arranged in the support sleeve 12, the opposite ends of the support sleeve 12 and the sliding rod 13 are hingedly connected with the moving base 1 and the arm 2 respectively, a fastening bolt 14 is threadedly connected with the circumferential surface of the support sleeve 12 and extends into the inside of the support sleeve 12, and a plurality of screw holes corresponding to the fastening bolt 14 are arranged on the sliding rod 13 and spaced along the length direction of the sliding rod 13. By sliding the sliding rod 13 and matching the fastening bolt 14 with the screw holes at different positions, the inclination angle of the arm 2 can be conveniently adjusted, so that the roller 3 at the end of the arm 2 can be supported and rolled on the inner side wall of the pipeline, thereby quickly adapting to the pipelines with different diameters.

[0047] Of course, in other embodiments, the telescopic support 11 can also be a telescopic cylinder, at this time, a pressure sensor is arranged above the roller 3, the pressure sensor cooperates with the telescopic cylinder to ensure that the pressure of each roller 3 supported on the inner wall of the pipeline is the same, thereby ensuring that the ultraviolet light curing repair equipment is stably supported on the inner wall of the pipeline, ensuring that the pipeline is uniformly stressed, improving the repair effect, and at the same time, during the traveling process, the inclination angle of the arm 2 can be automatically adjusted according to the inner diameter of the pipeline by using the pressure sensor and the telescopic cylinder to cooperate, thereby improving the applicability of the equipment and the automation degree of the operation.

[0048] In the embodiment, the ultraviolet light curing repair equipment further includes a power supply, specifically, the power supply includes a storage battery (not shown in the figure), the storage battery is arranged in the inside of one of the moving bases 1, and the storage battery is electrically connected with the ultraviolet lamp 7 to realize power supply. Meanwhile, a traction ring 15 for traction traveling is further arranged on the other moving base 1.

[0049] The working process of the present application is as follows:

[0050] The ultraviolet light curing repair device is placed at the pipe inlet, the center of the moving seat 1 is aligned with the center of the pipe, the external traction device such as a winch or a rope is connected through the traction ring 15, the device is slowly pulled into the pipe, the fastening bolt 14 on the telescopic support 11 is unscrewed, the sliding rod 13 is slid according to the contact condition of the inner wall of the pipe and the roller 3, the inclination angle of the support arm 2 is adjusted, the roller 3 is tightly attached to the inner wall of the pipe, the stable support and movement of the device in the pipe are ensured, and after the adjustment is completed, the fastening bolt 14 is tightened to fix the angle of the support arm 2.

[0051] The ultraviolet lamp 7 works, and the resin material in the pipe starts to be cured and repaired, and at the same time, the device is slowly pulled in the pipe by the traction device to irradiate and cure the inner wall of the pipe.

[0052] After the curing is completed, the device is slowly pulled out of the pipe by the traction device and placed at a specified position, the fixing nuts 9 at both ends of the support rod 6 are unscrewed, the fixing disc 5 is separated from the support rod 6, the ultraviolet lamp 7 is taken out, and inspection and maintenance are performed. If the ultraviolet lamp 7 is found to be damaged or aged, it is replaced in time.

[0053] In summary, the ultraviolet light curing repair device of the utility model, the support rod 6 and the ultraviolet lamp 7 are detachably arranged, the support rod 6 is provided with the blocking disc 8 at both ends, the fixing disc 5 is fixed on the blocking disc 8 through the nut, the fixing disc 5 is provided with the clamping groove 10 for clamping both ends of the ultraviolet lamp 7, and the design makes it easy to separate the fixing disc 5 and take out the ultraviolet lamp 7 only by unscrewing the nut when the ultraviolet lamp 7 needs to be maintained or replaced, so that the operation is simple and convenient.

[0054] Embodiment 2: The embodiment provides a different support rod 6, which is different from that in embodiment 1. Figure 5 、 6 As shown in the figure, the support rod 6 is a telescopic rod, specifically, the support rod 6 is provided with two support barrels 18 and a penetrating rod 19, the openings of the two support barrels 18 are oppositely arranged, the penetrating rod 19 is inserted into the inner cavities of the two support barrels 18 at both ends, the sliding grooves 21 extending along the axial direction are formed in the circumferential surfaces of the support barrels 18, the fixing bolts 20 are slidably arranged in the sliding grooves 21, the threaded holes corresponding to the fixing bolts 20 are formed in the end portions of the penetrating rod 19, and the lower ends of the fixing bolts 20 are screwed into the threaded holes.

[0055] By screwing the fixing bolt 20, the end of the fixing bolt 20 is in contact with the sliding groove 21, the fixing and locking of the penetrating rod 19 and the supporting cylinder 18 are realized, by unscrewing the fixing bolt 20, the sliding of the penetrating rod 19 in the supporting cylinder 18 can be realized, so as to adjust the length of the whole supporting rod 6, and realize the telescopic function. In this way, the length of the ultraviolet lamp tube 7 can be adjusted, the ultraviolet lamp bracket 16 can be adapted to ultraviolet lamp tubes 7 with different lengths, and municipal pipelines with different tube length requirements and operation requirements can be applied, the practicability is improved, and the application range is expanded.

[0056] The above are only preferred embodiments of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0057] In the description of the embodiments of the present application, it should be explained that, if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0058] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

Claims

1. A municipal pipe ultraviolet light cured repair apparatus, characterized by, The application discloses a UV lamp bracket, which comprises fixing discs, support rods, fixing nuts and UV lamps.

2. The municipal pipe ultraviolet light cure-in-place repair apparatus of claim 1, wherein, The support rods are provided with baffle discs near the ends.

3. The municipal pipe ultraviolet light cure-in-place repair apparatus of claim 1, wherein, The support rods are arranged in an array around the fixing discs and between the adjacent UV lamps.

4. The municipal pipe ultraviolet light cure-in-place repair apparatus of claim 3, wherein, The support rods are telescopic rods.

5. The municipal pipe ultraviolet light cure-in-place rehabilitation apparatus of claim 1, wherein, The inner side of the fixing disc is provided with a clamping groove corresponding to the position of the UV lamp.

6. The municipal pipe ultraviolet light cure-in-place repair apparatus of claim 1, wherein, The connecting column is connected between the moving seat and the fixing disc.

7. The municipal pipe ultraviolet light cure-in-place repair apparatus of claim 1, wherein, The end of the support arm away from the moving seat is hingedly connected to the moving seat.

8. The municipal pipe ultraviolet light cure-in-place repair apparatus of claim 7, wherein, The telescopic support comprises a support sleeve and a sliding rod arranged in the support sleeve. The sleeve is provided with a fastening bolt screwed into the sleeve. The sliding rod is provided with a plurality of screw holes corresponding to the fastening bolt.

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