Auxiliary mounting bracket for polyethylene blow-off pipeline

Abstract

The invention relates to the technical field of auxiliary mounting brackets for blow-off pipelines, in particular to an auxiliary mounting bracket for a polyethylene blow-off pipeline, which comprises two ring groups buckled on the outer side of the polyethylene blow-off pipeline, each ring group comprises a left fixing ring and a right fixing ring, and the upper end and the lower end of each left fixing ring and the upper end and the lower end of each right fixing ring are connected with frame plates; the two opposite frame plates are in butt joint and fixed through locking bolts, adjusting accessories are arranged on the outer sides of the left frame plate and the right frame plate, shifting accessories are arranged at the top ends of the adjusting accessories, the adjusting accessories comprise plate frames fixed to the surfaces of the frame plates, gears are rotationally installed in the plate frames, and racks are meshed with the lower portions of the gears. According to the butt joint device, the gear can be controlled to roll on the surface of the rack through pulling of the shifting rod, the butt joint positions of the two polyethylene blow-off pipes clamped by the two ring sets are controlled to be close to each other, the hot melting butt joint ends of the two polyethylene blow-off pipes can be continuously and constantly pressed and attached, and the butt joint effect of the two polyethylene blow-off pipes is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary installation brackets for sewage pipes, and in particular to an auxiliary installation bracket for polyethylene sewage pipes. Background Art

[0002] With the acceleration of urbanization and the enhancement of environmental protection awareness, the demand for municipal drainage systems is increasing. Polyethylene (PE) sewage pipes are widely used in urban drainage systems due to their corrosion resistance, light weight, and easy installation. However, in the actual installation process, polyethylene sewage pipes still face some challenges, especially in complex terrain and long-distance laying.

[0003] In order to cope with different terrain pipeline laying, multiple sections of polyethylene sewage pipes need to be hot-melt butt-jointed. During the butt-jointing, the polyethylene sewage pipe connection end is heated by a heating plate. After the heat absorption time is reached, the machine is quickly opened, the heating plate is removed, and the two hot-melt end faces are quickly adhered and pressurized. To ensure the quality of the hot-melt butt-jointing, the switching cycle is as short as possible. The butt-jointing process should always be carried out under melting pressure. The curling width should be 1 to 2 mm. A certain pressure is maintained. After cooling, the purpose of welding is achieved. Since the polyethylene sewage pipe has a certain length, it is difficult to ensure the balance of the two polyethylene sewage pipes when they are butt-jointed by manual support of the staff. It is easy to tilt due to falling, resulting in a gap between the butt-jointed ends of the two polyethylene sewage pipes. When the hot-melt end and the butt-jointed end of the polyethylene sewage pipe are connected, it is difficult to maintain a constant pressure by manpower alone, which will also affect the butt-jointing effect of the two polyethylene sewage pipes. Therefore, an auxiliary mounting bracket for polyethylene sewage pipes is needed to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The two ends of the guide rail are connected with the guide rail, and the two ends of the guide rail are movably mounted on the support rail.

[0006] Preferably, the inner walls of the left and right fixing rings are both connected with special-shaped inner clamps, the inner walls of the special-shaped inner clamps are provided with trapezoidal grooves, and the inner walls of the trapezoidal grooves are equidistantly provided with rubber strip ends. The trapezoidal grooves on the inner sides of the special-shaped inner clamps can adapt to and fit the polyethylene sewage pipe, and the rubber strip end design on the inner wall of the special-shaped inner clamps can increase the friction on the polyethylene sewage pipe.

[0007] Preferably, a guide rail is connected to the center position of the bottom inner end of the plate frame, and the guide rail is embedded in the bottom end of the rack through a guide groove. The rack can be limited by the guide rail to ensure the movement stability of the rack and prevent the rack from deviating and shaking during suspension movement.

[0008] Preferably, the toggle accessory includes a U-shaped plate fixed to the top of the plate frame, a movable rod is movably installed on the top of the U-shaped plate, and the top of the movable rod is connected to a toggle rod, the bottom end of the movable rod is connected to a plate seat by a bolt, and a push plate is movably installed inside the plate seat. When the toggle rod is toggled to the left, the toggle rod can cooperate with the movable rod to drive the plate seat to move, so that the plate seat pushes the push plate, and the push plate can be controlled to push the teeth above the gear to control the rotation of the gear.

[0009] Preferably, the left end face of the push plate is in contact with the inner wall of the plate seat, and the push plate and the left side of the plate seat are both provided with a bracket end, and the two bracket ends are connected and fixed by a support spring, and the push plate is supported by the side of the plate seat. When the lever is moved, the movable rod can be controlled to rotate, driving the plate seat to push the push plate, which is convenient for controlling the gear to rotate in short distances multiple times, and is convenient for fine-tuning the polyethylene sewage pipe clamped by the two ring groups.

[0010] Preferably, the auxiliary support accessory includes a support plate, and a guide groove is opened on the side of the support plate for the guide frame to move. The guide frame is composed of a slider end and a hanging plate end. Through the design of the guide frame, the ring group and the auxiliary support accessory form a whole, which is convenient for assembly.

[0011] Preferably, four threaded shafts are inserted at the corner positions of the top of the support plate, and the tops of two adjacent threaded shafts are connected to guard rings. Two trapezoidal block ends are symmetrically arranged on the top of the support plate. When the support plate provides auxiliary support for the polyethylene sewage pipe, the two trapezoidal block ends at the top of the support plate can limit the polyethylene sewage pipe. The inner side surface of the trapezoidal block end at the top of the support plate is inclined, which can adapt to the support and limitation of polyethylene sewage pipes of various calibers.

[0012] Preferably, the bottom end of the support plate is connected to a vertical plate, and a limiting block is connected at the center position of the bottom end of the vertical plate. The limiting block is movably installed on the base surface through a guide groove. Through grooves are provided on both sides of the inner wall of the base guide groove. The vertical cross-section of the limiting block is an inverted T-shaped structure, which can prevent the vertical plate from tilting and falling during movement, affecting the supporting effect of the support plate on the pipeline.

[0013] Preferably, pads are connected to the left and right sides of the bottom end of the vertical plate, and fixing bolts are vertically inserted through the through holes on the surface of the pads. The axial ends of the fixing bolts are inserted into the surface of the base through threaded holes. The axial ends of the fixing bolts pass through the through holes of the pads and are inserted into the corresponding threaded holes on the surface of the base, thereby ensuring the stability of the vertical plate after adjustment.

[0014] The present invention has at least the following beneficial effects: 1. By setting up ring groups, adjusting accessories and toggle accessories, the stable docking of two polyethylene sewage pipes can be achieved. Compared with the traditional structure, by turning the toggle lever, the gear can be controlled to roll on the rack surface, and the docking points of the two polyethylene sewage pipes clamped by the two ring groups can be controlled to approach each other, so that the hot-melt butt ends of the two polyethylene sewage pipes can be continuously and constantly pressed together, ensuring the docking effect of the two polyethylene sewage pipes.

[0015] 2. By setting up the ring group and auxiliary support accessories, the docking balance between the two polyethylene sewage pipes is ensured. By moving the guide frame on the side of the support plate, the left and right fixed rings are controlled to clamp the polyethylene sewage pipe. The extended support plate can provide auxiliary support for the polyethylene sewage pipe to ensure the balance of the polyethylene sewage pipe during docking and reduce the chance of falling and tilting due to weight during manual docking.

[0016] 3. By setting auxiliary support accessories, the polyethylene sewage pipe against the wall can be conveniently suspended and supported. By moving the limit block in the guide groove of the base, the vertical plate can be controlled to move horizontally on the surface of the polyethylene sewage pipe, and the connected polyethylene sewage pipe can be controlled to be as close to the inner side of the wall as possible, which is convenient for fine-tuning the polyethylene sewage pipe so that it can be suspended in a suitable position, ensuring the convenience of wall-mounted installation of the polyethylene sewage pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the external structure of an auxiliary mounting bracket for a polyethylene sewage pipe proposed by the present invention; Figure 2 This is a schematic diagram of the three-dimensional disassembled structure of a ring group in an auxiliary installation bracket for a polyethylene sewage pipe proposed by the present invention; Figure 3 This is a schematic diagram of the partial disassembly structure of a ring assembly in an auxiliary installation bracket for a polyethylene sewage pipe proposed by the present invention; Figure 4 This is a schematic diagram of the partially disassembled structure of an adjustment fitting in an auxiliary mounting bracket for a polyethylene sewage pipe proposed by the present invention; Figure 5 This is a schematic diagram of the three-dimensional disassembled structure of an adjusting fitting and a toggle fitting in an auxiliary mounting bracket for a polyethylene sewage pipe proposed by the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of a toggle fitting in an auxiliary mounting bracket for a polyethylene sewage pipe proposed by the present invention; Figure 7 This is a schematic diagram of the three-dimensional disassembled structure of an auxiliary support fitting in an auxiliary installation bracket for a polyethylene sewage pipe proposed by the present invention; Figure 8 This is a schematic diagram of the partially disassembled structure of an auxiliary support fitting in an auxiliary installation bracket for a polyethylene sewage pipe proposed by the present invention.

[0019] In the figure: 1. Ring assembly; 11. Left fixing ring; 12. Right fixing ring; 13. Special-shaped inner clamp; 14. Frame plate; 15. Locking bolt; 16. Guide frame; 2. Adjustment accessories; 21. Plate frame; 22. Gear; 23. Rack; 24. Guide rail; 3. Toggle accessories; 31. U-shaped plate; 32. Movable rod; 33. Toggle rod; 34. Plate seat; 35. Push plate; 36. Support spring; 4. Auxiliary support accessories; 41. Support plate; 42. Guard ring; 43. Threaded shaft; 44. Vertical plate; 45. Limit block; 46. Base; 47. Pad; 48. Fixing bolt. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] Reference Figure 1-8 , an auxiliary mounting bracket for a polyethylene sewage pipe, comprising two ring groups 1 buckled onto the outside of the polyethylene sewage pipe, both ring groups 1 comprising a left fixed ring 11 and a right fixed ring 12, the upper and lower ends of the left fixed ring 11 and the right fixed ring 12 are connected with a frame plate 14, the two opposing frame plates 14 are fixed by a locking bolt 15, and an adjusting accessory 2 is provided on the outside of the left and right frame plates 14, and a toggle accessory 3 is provided on the top of the adjusting accessory 2, the adjusting accessory 2 comprises a plate frame 21 fixed to the surface of the frame plate 14, a gear 22 is rotatably installed inside the plate frame 21, and a rack 23 is meshed under the gear 22, the end of the rack 23 is connected and fixed to the outside of the left fixed ring 11 and the right fixed ring 12 in another group of ring groups 1, the two sides of the bottom two frame plates 14 are connected with a guide frame 16, and the end of the guide frame 16 is movably installed with an auxiliary support accessory 4.

[0022] The inner walls of the left fixing ring 11 and the right fixing ring 12 are both connected with special-shaped inner clamping blocks 13 . The inner walls of the special-shaped inner clamping blocks 13 are provided with trapezoidal grooves, and rubber strip ends are equidistantly arranged on the inner walls of the trapezoidal grooves.

[0023] A guide rail 24 is connected to the center of the bottom inner end of the plate frame 21 , and the guide rail 24 is embedded in the bottom end of the rack 23 through a guide groove.

[0024] The toggle accessory 3 includes a U-shaped plate 31 fixed to the top of the plate frame 21, a movable rod 32 is movably installed on the top of the U-shaped plate 31, and the top of the movable rod 32 is connected to the toggle rod 33, the bottom end of the movable rod 32 is connected to the plate seat 34 by bolts, and a push plate 35 is movably installed inside the plate seat 34.

[0025] The left end surface of the push plate 35 is in contact with the inner wall of the plate seat 34 . The push plate 35 and the left side of the plate seat 34 are both provided with a bracket end, and the two bracket ends are connected and fixed by a support spring 36 .

[0026] The auxiliary support fitting 4 includes a support plate 41 , and a guide groove is provided on a side of the support plate 41 for the guide frame 16 to move. The guide frame 16 is composed of a slider end and a hanging plate end.

[0027] Four threaded shafts 43 are inserted at the corners of the top end of the support plate 41 , and the top ends of two adjacent threaded shafts 43 are connected to a guard ring 42 . Two trapezoidal block ends are symmetrically provided at the top end of the support plate 41 .

[0028] The bottom end of the support plate 41 is connected to the vertical plate 44, and the center position of the bottom end of the vertical plate 44 is connected to the limit block 45. The limit block 45 is movably installed on the surface of the base 46 through the guide groove. Through grooves are opened on both sides of the inner wall of the guide groove of the base 46.

[0029] Pads 47 are connected to the left and right sides of the bottom end of the vertical plate 44 . Fixing bolts 48 are vertically inserted through through holes on the surface of the pads 47 . The axial ends of the fixing bolts 48 are inserted into the surface of the base 46 through threaded holes.

[0030] The two ring groups 1 are respectively fixed on the outer sides of the butt ends of the two polyethylene sewage pipes. The gear 22 rotates on the surface of the rack 23 to control the movement of the plate frame 21, and then the polyethylene sewage pipe clamped by the ring group 1 is controlled to move closer to the polyethylene sewage pipe on the other side, so that the hot-melt butt ends of the two polyethylene sewage pipes can be continuously and constantly pressed and fitted, thereby ensuring the butt joint effect of the two polyethylene sewage pipes.

[0031] When the left fixing ring 11 and the right fixing ring 12 are clamped and fixed on the surface of the polyethylene sewage pipe, the trapezoidal groove on the inner side of the special-shaped inner clamping block 13 can adapt to fit the polyethylene sewage pipe. The rubber strip end design on the inner wall of the special-shaped inner clamping block 13 can increase the friction force on the polyethylene sewage pipe. At the same time, the elastic design of the special-shaped inner clamping block 13 can prevent the surface of the polyethylene sewage pipe from being worn during clamping.

[0032] The guide rail 24 can limit the rack 23 to ensure the movement stability of the rack 23 and prevent the rack 23 from deviating and shaking during suspension movement. The top of the guide rail 24 is designed with an arc structure to ensure the smooth movement of the rack 23 on the surface of the guide rail 24.

[0033] An opening is provided below the U-shaped plate 31, and the end of the push plate 35 is inserted into the teeth at the top of the gear 22. When the lever 33 is toggled to the left, the lever 33 can cooperate with the movable rod 32 to drive the plate seat 34 to move, so that the plate seat 34 pushes the push plate 35, and the push plate 35 can be controlled to push the teeth on the upper part of the gear 22 to control the rotation of the gear 22. When the lever 33 is toggled to the right, the movable rod 32 can drive the plate seat 34 to move, so that the push plate 35 hits the surface of the gear 22 and then rotates and tilts until the push plate 35 is re-positioned at the teeth at the top of the gear 22. Under the tension of the support spring 36, it can be ensured that the push plate 35 remains in an upright state after being reset.

[0034] The push plate 35 is stretched by the elastic force of the support spring 36 so that the push plate 35 can be abutted against the inner wall of the vertical plate end of the plate seat 34, and the push plate 35 is supported by the abutting side of the plate seat 34. When the lever 33 is toggled, the movable rod 32 can be controlled to rotate, driving the plate seat 34 to push the push plate 35, making it convenient to control the gear 22 to rotate multiple times in short distances, and to facilitate fine-tuning of the polyethylene sewage pipe clamped by the two ring groups 1.

[0035] The guide frame 16 is movably installed in the side guide groove of the support plate 41, which makes it convenient for the left fixing ring 11 and the right fixing ring 12 to clamp the polyethylene sewage pipe. Through the design of the guide frame 16, the ring group 1 and the auxiliary support accessory 4 form a whole, which is convenient for assembly.

[0036] When the support plate 41 assists in supporting the polyethylene sewage pipe, the two trapezoidal block ends at the top of the support plate 41 can limit the polyethylene sewage pipe. The inner side surface of the trapezoidal block end at the top of the support plate 41 is inclined, which can adapt to the support and limitation of polyethylene sewage pipes of various calibers. The threaded shafts 43 are grouped in pairs, and the top ends of the two threaded shafts 43 are respectively connected and fixed to the two ends of the guard ring 42. The threaded shaft 43 passes through the through holes in the corners of the support plate 41, so that the guard ring 42 presses down the polyethylene sewage pipe to ensure the stability of the downward pressure on the polyethylene sewage pipe. After the threaded shaft 43 is inserted, a nut is sleeved on the end of the threaded shaft 43 for locking.

[0037] The guide groove of the base 46 can provide a moving track for the limit block 45 to ensure the convenience of moving the limit block 45. At the same time, the vertical section of the limit block 45 is an inverted T-shaped structure, which can prevent the vertical plate 44 from tilting and falling during movement, affecting the supporting effect of the support plate 41 on the pipeline.

[0038] A plurality of threaded holes are equidistantly provided on the surface of the base 46. When the vertical plate 44 is moved and adjusted on the surface of the base 46, the axial end of the fixing bolt 48 can be passed through the through hole of the pad 47 and then inserted into the corresponding threaded hole on the surface of the base 46, thereby ensuring the stability of the vertical plate 44 after the adjustment. The multiple threaded holes on the surface of the base 46 enable the vertical plate 44 to be adjusted in multiple stages.

[0039] Working principle: According to the attached Figure 1 With attached Figure 2 As shown, during use, the two ring groups 1 can be fixed dry on the outside of the polyethylene sewage pipe. When fixed, the left fixing ring 11 and the right fixing ring 12 are clamped and buckled on the surface of the polyethylene sewage pipe. The left fixing ring 11 and the right fixing ring 12 are fixed by locking bolts 15 above and below. Supported by the auxiliary support accessories 4, the two polyethylene sewage pipes are arranged in the same horizontal line. When one of the polyethylene sewage pipe connection ends is hot-melted through the heating plate, according to the attached Figure 5 , Attachment Figure 6 With attached Figure 7 As shown, the lever 33 is moved, and the lever 33 can drive the movable rod 32 to rotate. The movable rod 32 drives the push plate 35 through the plate seat 34 to move the teeth of the gear 22, so that the gear 22 rotates to control the movement of the rack 23, so that the rack 23 can drive the other ring group 1 to move. Since the ring group 1 is fixed to the outside of the polyethylene sewage pipe, the hot melt end can be fitted with the butt end of the other polyethylene sewage pipe, and the pressure state is continuously maintained, so that the two polyethylene sewage pipes can maintain a better pressure until the cooling and docking are completed; Secondly, according to the attached Figure 6When the push plate 35 is pushed and reset, the lever 33 is toggled in the opposite direction, and the lever 33 can drive the movable rod 32 to move in the opposite direction. When the movable rod 32 drives the plate seat 34 to move, the push plate 35 can be driven to move. The push plate 35 and the gear 22 rotate, causing the bottom end of the push plate 35 to rotate and tilt under force until the bottom end of the push plate 35 moves into the teeth at the top of the gear 22. When there is no resistance from the gear 22, the push plate 35 can be placed upright and inserted into the gap between the teeth on the surface of the gear 22 under the tension of the support spring 36, waiting for the next push of the push plate 35 to push the gear 22. Finally, according to the attached Figure 7 As shown, before the polyethylene sewage pipe is docked, the polyethylene sewage pipe can be placed on the surface of the support plate 41 and fastened to the top of the polyethylene sewage pipe through the protective ring 42, so that the threaded shaft 43 is inserted into the side through-hole of the support plate 41 and is rotated and fixed on the surface of the threaded shaft 43 by the nut, and the limit block 45 is moved in the guide groove of the base 46, so that the position of the support plate 41 can be adjusted, which is convenient for fine-tuning the position of the suspended polyethylene sewage pipe. After the support plate 41 is adjusted, the fixing bolt 48 can be passed through the pad 47 and then inserted into the corresponding threaded hole on the surface of the base 46 to ensure the stability of the vertical plate 44 after adjustment.

[0040] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary mounting bracket for a polyethylene sewage pipe, characterized in that: The invention comprises two ring groups (1) buckled on the outside of the polyethylene sewage pipe, wherein the two ring groups (1) both comprise a left fixed ring (11) and a right fixed ring (12), the upper and lower ends of the left fixed ring (11) and the right fixed ring (12) are connected with a frame plate (14), the two opposite frame plates (14) are fixed by a locking bolt (15), the outer sides of the left and right frame plates (14) are provided with an adjustment accessory (2), and the top of the adjustment accessory (2) is provided with a toggle accessory (3), the adjustment The joint accessory (2) includes a plate frame (21) fixed on the surface of the frame plate (14), a gear (22) is rotatably installed inside the plate frame (21), and a rack (23) is meshed below the gear (22), and the end of the rack (23) is connected and fixed to the outside of the left fixed ring (11) and the right fixed ring (12) in another set of ring groups (1), and the two sides of the frame plate (14) at the bottom are connected to the guide frame (16), and the end of the guide frame (16) is movably installed with an auxiliary support accessory (4).

2. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 1, characterized in that: The inner walls of the left fixing ring (11) and the right fixing ring (12) are both connected with a special-shaped inner clamping block (13), the inner wall of the special-shaped inner clamping block (13) is provided with a trapezoidal groove, and the inner wall of the trapezoidal groove is provided with rubber strip ends at equal intervals.

3. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 2, characterized in that: A guide rail (24) is connected to the center of the inner bottom end of the plate frame (21), and the guide rail (24) is embedded in the bottom end of the rack (23) through a guide groove.

4. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 1, characterized in that: The toggle fitting (3) comprises a U-shaped plate (31) fixed to the top of the plate frame (21), a movable rod (32) being movably mounted on the top of the U-shaped plate (31), and a toggle rod (33) being connected to the top of the movable rod (32), a plate seat (34) being butted against the bottom end of the movable rod (32) by bolts, and a push plate (35) being movably mounted inside the plate seat (34).

5. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 4, characterized in that: The left end surface of the push plate (35) is in contact with the inner wall of the plate seat (34). The push plate (35) and the left side of the plate seat (34) are both provided with a bracket end, and the two bracket ends are connected and fixed by a support spring (36).

6. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 1, characterized in that: The auxiliary support accessory (4) includes a support plate (41). A guide groove for the guide frame (16) to move is provided on the side of the support plate (41). The guide frame (16) is composed of a slider end and a hanging plate end.

7. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 6, characterized in that: Four threaded shafts (43) are inserted at the corner positions of the top end of the support plate (41), and the top ends of two adjacent threaded shafts (43) are connected to a guard ring (42). The top end of the support plate (41) is symmetrically provided with two trapezoidal block ends.

8. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 7, characterized in that: The bottom end of the support plate (41) is connected to a vertical plate (44), and a limit block (45) is connected at the center position of the bottom end of the vertical plate (44). The limit block (45) is movably mounted on the surface of the base (46) through a guide groove. Through grooves are opened on both sides of the inner wall of the guide groove of the base (46).

9. The auxiliary mounting bracket for a polyethylene sewage pipe according to claim 8, characterized in that: The left and right sides of the bottom end of the vertical plate (44) are connected to backing plates (47), and the surface of the backing plate (47) is vertically inserted with a fixing bolt (48) through a through hole, and the axial end of the fixing bolt (48) is inserted into the surface of the base (46) through a threaded hole.

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