CN112623625A

CN112623625A - Adjustable upper supporting roller frame for plane turning belt conveyor

Info

Publication number: CN112623625A
Application number: CN202110014259.1A
Authority: CN
Inventors: 王旭东; 宋刚; 韩猛; 刘强; 王瑄
Original assignee: China Coal Handan Design Engineering Co ltd; China Coal Tianjin Design Engineering Co ltd
Current assignee: China Coal Handan Design Engineering Co ltd; China Coal Tianjin Design Engineering Co ltd
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-04-09

Abstract

The invention discloses an adjustable upper supporting roller frame for a plane turning belt conveyor, which comprises an angle adjusting device and a conveying device arranged right below the angle adjusting device, wherein a sector support and an arc-shaped hole vertically formed on a rotating plate are arranged, the arc-shaped hole is fixed at the upper end of a U-shaped frame of the conveying device and is fixed in a turning section of the conveying device, a rotating shaft is formed above a middle frame at the outer curve side, the sector support can rotate conveniently, one end of the adjusting hole rotates upwards, the adjusting hole of the sector support and a plumb bob surface form an inclined angle, a first bolt and a first nut fix the sector support and an ear plate, so that the height of the sector support is adjusted, meanwhile, the rotating plate below a supporting beam and a bottom rotating plate are connected through a screw rod between the arc-shaped hole and a through hole, the arc-shaped hole is vertically formed on the surface of the rotating plate, so that the rotating, and rotate a certain angle, and then reach the adjustment of fan-shaped support angle.

Description

Adjustable upper supporting roller frame for plane turning belt conveyor

Technical Field

The invention relates to the technical field of conveying equipment, in particular to an adjustable upper supporting roller frame for a plane turning belt conveyor.

Background

The belt conveyor is also called as a belt conveyor, is a transportation machine, and is widely applied to industries such as coal, metallurgy, traffic, electric power, building materials, chemical engineering, ports and the like. The arrangement form of the transportation device is divided into horizontal transportation, upward transportation, downward transportation and plane turning transportation. The plane turning belt conveyor is mainly different from a common belt conveyor in that the plane turning belt conveyor adopts the related technology to enable the rubber belt to naturally bend and run according to the mechanical rule so as to change the conveying direction, and a centripetal resultant force is generated under the action of the tension of the rubber belt at a turning curve section so as to enable the rubber belt to generate the tendency of sliding towards the inner side of the curve. Therefore, measures should be taken on the design of the turning curve segment structure to generate a guiding force towards the outer side of the turning curve line so as to counteract the centripetal resultant force, so that the belt conveyor can naturally turn.

Due to the structural particularity of the plane turning belt conveyor, the installation and debugging of the common carrier roller frame at the turning section are complicated, repeated starting and stopping debugging is needed, even the carrier roller frame needs to be dismantled, and adjustment, verification, welding and the like are carried out again, so that the whole debugging project consumes manpower, material resources and construction period.

Disclosure of Invention

The invention aims to provide an adjustable upper supporting roller frame for a plane turning belt conveyor, which aims to solve the problems in the background technology.

In order to achieve the above object, an object of the present invention is to provide an adjustable roller stand for a belt conveyor with a plane turning, including an angle adjusting device, and a conveying device installed right below the angle adjusting device, wherein the angle adjusting device includes:

the supporting beam is of a ladder-shaped structure and is of an inverted ladder structure with an upward opening, two ends of the supporting beam are symmetrically provided with inclined carrier roller frames, flat carrier roller frames are symmetrically arranged right above the supporting beam, the joints of the two inclined carrier roller frames and the two flat carrier roller frames are rotatably connected with three upper carrier rollers, and the upper surfaces of the three upper carrier rollers are attached with upper-layer adhesive tapes;

the fan-shaped support is of a fan-shaped structure, one end of the fan center of the fan-shaped support is longitudinally provided with a positioning pin hole, a pin shaft which is matched with the positioning pin hole is arranged in the positioning pin hole, the surface of the fan-shaped support, which is far away from the positioning pin hole, is annularly and equidistantly provided with a plurality of adjusting holes, the inner part of each adjusting hole is in threaded connection with a first bolt, and the first bolt is in threaded connection with a first nut;

the rotating plate is arranged under the supporting beam, arc-shaped holes are vertically and symmetrically formed in two sides of the rotating plate, and a hole is drilled in the center of the rotating plate;

the bottom rotating plate is fixedly arranged right above the fan-shaped support and is the same as the rotating plate in size, two through holes are vertically formed in the bottom rotating plate, the two through holes are the same as and correspond to the arc-shaped holes in pore diameter, a rotating shaft is arranged in the center of the upper surface of the bottom rotating plate, and the rotating shaft is inserted into the center of the rotating plate and is matched with the rotating plate to rotate;

installing support, installing support is "L" type structure, installing support swing joint is in fan-shaped support both ends, two installing support is close to fan-shaped support one side symmetry and is provided with otic placode, two the otic placode interval is the same with fan-shaped support horizontal thickness, two the movable orifice has vertically been seted up to the otic placode.

As a further improvement of the technical scheme, the movable hole and the positioning pin hole are in the same plane and are the same in size, and threaded holes are formed in the upper surface of the mounting support in a vertically symmetrical mode.

As a further improvement of the technical scheme, the upper ends of the two inclined carrier roller frames are transversely provided with inclined clamping grooves, and the upper ends of the inclined clamping grooves are of open structures.

As a further improvement of the technical scheme, flat clamping grooves are transversely formed in the upper ends of the two flat carrier roller frames, the upper ends of the flat clamping grooves are of an open structure, and the flat clamping grooves are identical to the inclined clamping grooves in structure.

As a further improvement of the technical scheme, the bending angles of the two sides of the supporting beam are 30-60 degrees and are consistent with the roller slot angle required by the turning section of the conveying device, and the central angles among the holes of the adjusting holes can be 0.5 degree, 1 degree and 2 degrees and are determined according to the lifting angle of the inner side of the roller frame.

As a further improvement of the technical scheme, the rotating plate and the rotating plate at the bottom are both circular structures.

As a further improvement of the technical scheme, a bolt is inserted into one side of the pin shaft, the fan-shaped supports are two fan-shaped plates with the same structure, and two connecting plates are arranged at the joint of the two fan-shaped supports.

As a further improvement of the technical scheme, threaded holes are symmetrically formed in the upper surface of the mounting support.

As a further improvement of the technical scheme, the conveying device comprises symmetrically arranged supports, a middle support is vertically arranged at the center of the joint of the two supports, the two supports and the middle support are rotatably connected with three lower carrier rollers, and the upper surfaces of the three lower carrier rollers are attached to and rotate with lower-layer adhesive tapes.

As a further improvement of the technical scheme, the lower end of the support is provided with a supporting leg, a rubber seat is arranged under the supporting leg, a U-shaped frame is arranged at the upper end of the support, close to the mounting support, and a second screw rod is in threaded connection with a threaded hole and is arranged right above the second screw rod and is in threaded connection with a second nut.

Compared with the prior art, the invention has the beneficial effects that:

1. through the arc-shaped holes vertically formed on the sector support and the rotating plate, the angle adjusting device is fixed at the upper end of a U-shaped frame of the conveying device through the matching of a second screw and a second nut and is fixed in a turning section of the conveying device, the upper part of a middle frame at the outer curve side is fixed at one end of a positioning pin hole of the sector support and a movable hole of an ear plate at the outer curve side of the turning section through a pin shaft in a connecting way to form a rotating shaft, so that the sector support can rotate upwards at one end of an adjusting hole, a certain inclination angle is formed between one end of the adjusting hole of the sector support and a plumb bob surface at the moment, the inner side of the curve is high and the outer side of the curve is low, the sector support and the ear plate are fixed through a first bolt and a first nut, the height of the sector support is adjusted, meanwhile, the rotating plate and the bottom rotating plate below, the vertical arc hole of seting up in swivel plate surface for the swivel plate uses the rotation axis to rotate as the center, and rotatory certain angle, and then reaches the adjustment of fan-shaped support angle.

2. Through the cooperation of the fan-shaped support and the arc-shaped hole vertically formed, the structure and the processing technology are simple, and the manufacture is easy.

3. The angle of the upper layer of adhesive tape is changed through the integral arrangement of the angle adjusting device, so that the angle adjusting device is conveniently applied to the turning section of the plane turning belt conveyor used in industries such as coal, metallurgy, traffic, electric power, building materials, chemical engineering, ports and the like, and has a wide application range.

Drawings

FIG. 1 is a schematic view of the entire structure of embodiment 1;

FIG. 2 is a schematic view of a partial mounting structure of embodiment 1;

FIG. 3 is a schematic view of a support beam structure according to embodiment 1;

fig. 4 is a schematic structural view of an upper carrier roller according to embodiment 1;

FIG. 5 is a sectional view A-A in FIG. 2 of example 1;

FIG. 6 is a cross-sectional view taken along line D-D in FIG. 3 of example 1;

FIG. 7 is a schematic view of the structure of direction B in FIG. 3 of embodiment 1;

FIG. 8 is a front view showing one of the fan support according to embodiment 1;

FIG. 9 is a front view showing one of the fan support according to embodiment 1;

FIG. 10 is a schematic top view of the mounting bracket according to embodiment 1;

FIG. 11 is a front view of the mounting bracket according to embodiment 1;

FIG. 12 is a schematic top view of a sector support in accordance with embodiment 1;

FIG. 13 is a schematic view of the structure of a conveying apparatus according to embodiment 1;

fig. 14 is a schematic top view of the angle adjustment apparatus of embodiment 1.

The various reference numbers in the figures mean:

100. an angle adjusting device;

110. a support beam; 111. an inclined carrier roller frame; 1111. an oblique clamping groove; 1112. an upper supporting roller; 1113. an upper layer of adhesive tape; 112. a flat carrier roller frame; 1121. a flat clamping groove;

120. a fan-shaped support; 121. a positioning pin hole; 1211. a pin shaft; 1212. a bolt; 122. an adjustment hole; 1221. a first bolt; 1222. a first nut; 123. a connecting plate;

130. a rotating plate; 131. an arc-shaped hole;

140. mounting a support; 141. an ear plate; 142. a threaded hole; 143. a movable hole;

150. a bottom rotating plate; 151. a rotating shaft; 152. a through hole;

200. a conveying device;

210. a support; 211. a middle support;

220. a lower carrier roller; 221. a lower layer of adhesive tape;

230. supporting legs; 231. a rubber seat;

240. a U-shaped frame; 241. a second screw; 242. a second nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example 1

Referring to fig. 1 to 14, an object of the present embodiment is to provide an adjustable top roller frame for a belt conveyor with a plane turning, which includes an angle adjusting device 100, and a conveying device 200 installed right below the angle adjusting device 100, wherein the angle adjusting device 100 includes:

the support beam 110 is in a ladder-shaped structure and is in an inverted ladder-shaped structure with an upward opening, two ends of the support beam 110 are symmetrically provided with inclined carrier roller frames 111, a flat carrier roller frame 112 is symmetrically arranged right above the support beam 110, the joint of the two inclined carrier roller frames 111 and the two flat carrier roller frames 112 is rotatably connected with three upper carrier rollers 1112, the upper surfaces of the three upper carrier rollers 1112 are adhered with an upper layer of adhesive tape 1113, a fan-shaped support 120, the fan-shaped support 120 is in a fan-shaped structure, one end of the fan center of the fan-shaped support 120 is longitudinally provided with a positioning pin hole 121, a pin 1211 which is suitable for being assembled with the positioning pin hole 121 is arranged inside the positioning pin hole 121, a plurality of adjusting holes 122 are annularly and equidistantly arranged on the surface of one side of the fan-shaped support 120, which is far away from the positioning pin hole 121, the inside of each adjusting hole 122 is in threaded connection with a first bolt 1221, the first bolt 1221 is in, the center of the rotating plate 130 is drilled, the rotating plate 150 is arranged at the bottom, the rotating plate 150 is fixedly arranged right above the fan-shaped support 120 and has the same size as the rotating plate 130, two through holes 152 are vertically formed in the rotating plate 150 at the bottom, the through holes 152 are the same as the apertures of the arc-shaped holes 131 and are corresponding to the apertures of the arc-shaped holes, a rotating shaft 151 is arranged at the center of the upper surface of the rotating plate 150 at the bottom, the rotating shaft 151 is inserted into the center of the rotating plate 130 and is adapted to rotate, the mounting support 140 is in an L-shaped structure, the mounting support 140 is movably connected to two ends of the fan-shaped support 120, two ear plates 141 are symmetrically arranged at one side of the mounting support 140 close to the fan-shaped support.

When the adjustable upper supporting roller frame for the plane turning belt conveyor is used, the angle adjusting device 100 is fixed at the upper end of the U-shaped frame 240 of the conveying device 200 through the matching of the second screw 241 and the second nut 242, and is fixed in the turning section of the conveying device 200, above the middle frame on the outer curve side, one end of the positioning pin hole 121 of the sector support 120 is connected and fixed with the movable hole 143 of the lug plate 141 on the outer curve side of the turning section through the pin 1211 to form a rotating shaft, so that the rotation of the sector support 120 is facilitated, one end of the adjusting hole 122 is rotated upwards, at this time, one end of the adjusting hole 122 of the sector support 120 forms a certain inclination angle with the plumb surface, the inner side of the curve is high and the outer side is low, and the sector support 120 and the lug plate 14 are fixed through the first bolt 1221 and the first nut 1222, so as to achieve the height adjustment of the sector support 120, and simultaneously, the rotating plate 130 and the bottom, through the screw connection between the arc-shaped hole 131 and the through hole 152, the arc-shaped hole 131 is vertically formed in the surface of the rotating plate 130, so that the rotating plate 130 rotates around the rotating shaft 151 and rotates by a certain angle, and further the angle of the fan-shaped support 120 is adjusted.

In another embodiment, as shown in fig. 10 to 11, the movable holes 143 and the positioning pin holes 121 are on the same plane and have the same size, and the threaded holes 142 are vertically and symmetrically formed in the upper surface of the mounting support 140.

Through the design that the movable hole 143 and the positioning pin hole 121 are coplanar and have the same size, the first bolt 1221 can be conveniently used for connecting and fixing the mounting support 140 and the sector support 120, and meanwhile, the threaded holes 142 are symmetrically formed in the upper surface of the mounting support 140, so that the mounting support 140 and the U-shaped frame 240 can be conveniently fixed and detached.

In another embodiment, as shown in fig. 5, the upper ends of the two oblique carrier roller frames 111 are transversely provided with oblique clamping grooves 1111, and the upper ends of the oblique clamping grooves 1111 are open.

Through the open structure of oblique draw-in groove 1111 upper end, the quick block between the upper idler 1112 and the oblique bearing roller frame 111 of being convenient for, the dismantlement installation in later stage of being convenient for.

In another embodiment, as shown in fig. 6, the upper ends of the two flat supporting roller frames 112 are transversely provided with flat clamping grooves 1121, the upper ends of the flat clamping grooves 1121 are in an open structure, and the flat clamping grooves 1121 and the inclined clamping grooves 1111 have the same structure.

Through the upper end opening structure of the flat clamping groove 1121 transversely formed in the upper end of the flat carrier roller frame 112, the flat clamping groove 1121 and the inclined clamping groove 1111 are conveniently and quickly mounted and dismounted in the horizontal direction on the upper carrier roller 1112, and the two ends of the upper carrier roller 1112 are uniformly and rotatably connected.

In another embodiment, as shown in fig. 3, the bending angle of the two sides of the support beam 110 is 30-60 degrees, which is consistent with the roller slot angle required by the turning section of the conveying device 200, and the central angle between the holes of the adjusting holes 122 can be 0.5 degree, 1 degree or 2 degrees, which is determined according to the lifting angle of the inner side of the roller frame.

The number of the adjusting holes 122 is 3-5, the adjusting holes are determined according to the angle of the inner side of the roller frame needing to be raised, and the central angle between the adjusting holes 122 can be properly adjusted according to requirements.

In another embodiment, as shown in fig. 2, the rotating plate 130 and the bottom rotating plate 150 are both circular, which facilitates the rotation of the rotating plate 130 and the bottom rotating plate 150, and avoids affecting the operation of other accessories.

In another embodiment, as shown in fig. 12, a pin 1212 is inserted into one side of the pin 1211, the sector support 120 is two sector plates with the same structure, and two connecting plates 123 are disposed at the joint of the two sector supports 120.

The fan-shaped support 120 is convenient to disassemble and install by inserting the plug 1212 and the pin 1211, the angle adjustment is realized while the material consumption of the fan-shaped support 120 is reduced by arranging two fan-shaped plates with the same structure of the fan-shaped support 120, the material cost is saved, and the two fan-shaped supports 120 are reinforced by the two connecting plates 123.

In another embodiment, as shown in fig. 10, threaded holes 142 are symmetrically formed in the upper surface of the mounting base 140, and the mounting base 140 and the U-shaped frame 240 are assembled and disassembled by the cooperation of the threaded holes 142 and a second screw 241 between the U-shaped frame 240 and fastening the same by using a second nut 242.

In another embodiment, as shown in fig. 13, the conveying device 200 includes symmetrically arranged brackets 210, a middle bracket 211 is vertically arranged at the center of the joint of the two brackets 210, three lower rollers 220 are rotatably connected to the two brackets 210 and the middle bracket 211, and the upper surfaces of the three lower rollers 220 are in fit with and rotate on the lower layer of adhesive tape 221.

Through the support 210 and the middle support 211 that conveyor 200 symmetry set up, rotate between support 210 and the middle support 211 and be connected with the snub pulley 220, snub pulley 220 and conveyor 200 horizontal conveying carry the horizontal direction through lower floor's sticky tape 221.

In another embodiment, as shown in fig. 13, the lower ends of the brackets 210 are provided with supporting legs 230, rubber seats 231 are arranged right below the supporting legs 230, the upper ends of the brackets 210 are provided with U-shaped frames 240 near the mounting supports 140, the U-shaped frames 240 are in threaded connection with the threaded holes 142 to form second screw rods 241, and second nuts 242 are arranged right above the second screw rods 241 to form threaded connections.

The supporting leg 230 arranged at the bottom of the support 210 plays a role of fixing and supporting the conveying device 200, and the rubber seat 231 arranged at the bottom of the supporting leg 230 increases the friction force with the ground, improves the damping effect of the equipment, and meanwhile, the U-shaped frame 240 and the threaded hole 142 are in threaded connection with a second screw 241 and are fastened and adjusted through a second nut 242, so that the mounting support 140 and the U-shaped frame 240 can be conveniently detached and mounted.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a plane turn belt conveyor is with adjustable roller frame that goes up which characterized in that: including angle adjusting device (100) to and install conveyor (200) directly under angle adjusting device (100), angle adjusting device (100) including:

the support beam (110) is of a ladder-shaped structure and is of an inverted ladder structure with an upward opening, two ends of the support beam (110) are symmetrically provided with inclined carrier roller frames (111), flat carrier roller frames (112) are symmetrically arranged right above the support beam (110), the joint of the two inclined carrier roller frames (111) and the two flat carrier roller frames (112) is rotatably connected with three upper carrier rollers (1112), and the upper surfaces of the three upper carrier rollers (1112) are attached with an upper-layer adhesive tape (1113);

the fan-shaped support (120), the fan-shaped support (120) is of a fan-shaped structure, one end of the fan center of the fan-shaped support (120) is longitudinally provided with a positioning pin hole (121), a pin shaft (1211) which is suitable for being assembled with the positioning pin hole is arranged inside the positioning pin hole (121), the surface of one side, away from the positioning pin hole (121), of the fan-shaped support (120) is annularly provided with a plurality of adjusting holes (122) at equal intervals, the inside of each adjusting hole (122) is in threaded connection with a first bolt (1221), and the first bolt (1221) is in threaded connection with a first nut (1222);

the rotating plate (130) is arranged under the supporting beam (110), arc-shaped holes (131) are vertically and symmetrically formed in two sides of the rotating plate (130), and a hole is drilled in the circle center of the rotating plate (130);

the bottom rotating plate (150) is fixedly installed right above the fan-shaped support (120) and is the same as the rotating plate (130) in size, two through holes (152) are vertically formed in the bottom rotating plate (150), the two through holes (152) are the same as and correspond to the arc-shaped holes (131), a rotating shaft (151) is arranged in the center of the upper surface of the bottom rotating plate (150), and the rotating shaft (151) is inserted into the center of the rotating plate (130) and is matched with the rotating plate to rotate;

installing support (140), installing support (140) are "L" type structure, installing support (140) swing joint is in fan-shaped support (120) both ends, two installing support (140) are close to fan-shaped support (120) one side symmetry and are provided with otic placode (141), two otic placode (141) interval is the same with fan-shaped support (120) horizontal thickness, two movable hole (143) have vertically been seted up in otic placode (141).

2. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: the movable hole (143) and the positioning pin hole (121) are in the same plane and have the same size, and threaded holes (142) are vertically and symmetrically formed in the upper surface of the mounting support (140).

3. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: two oblique draw-in groove (1111) have transversely been seted up to oblique bearing roller frame (111) upper end, oblique draw-in groove (1111) upper end is open structure.

4. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: the upper ends of the two flat roller supporting frames (112) are transversely provided with flat clamping grooves (1121), the upper ends of the flat clamping grooves (1121) are of an open structure, and the flat clamping grooves (1121) and the inclined clamping grooves (1111) are identical in structure.

5. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: the bending angles of the two sides of the supporting beam (110) are 30-60 degrees and are consistent with the roller slot angle required by the turning section of the conveying device (200), and the central angle between the holes of the adjusting hole (122) can be 0.5 degree, 1 degree or 2 degrees and is determined according to the lifting angle of the inner side of the roller frame.

6. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: the rotating plate (130) and the bottom rotating plate (150) are both circular structures.

7. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: a bolt (1212) is inserted into one side of the pin shaft (1211), the fan-shaped support (120) is two fan-shaped plates with the same structure, and two connecting plates (123) are arranged at the joint of the two fan-shaped supports (120).

8. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: the upper surface of the mounting support (140) is symmetrically provided with threaded holes (142).

9. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 1, wherein: conveyor (200) are including support (210) that the symmetry set up, two support (210) junction center is vertical to be provided with middle support (211), two support (210) rotate with middle support (211) and are connected with three snub pulley (220), and is three snub pulley (220) upper surface laminating rotates there is lower floor's sticky tape (221).

10. The adjustable upper supporting roller frame for the plane turning belt conveyor as claimed in claim 9, wherein: support (210) lower extreme all is provided with supporting leg (230), be provided with rubber seat (231) under supporting leg (230), support (210) upper end is close to erection support (140) department and is provided with U type frame (240), U type frame (240) and screw hole (142) threaded connection have second screw rod (241), set up threaded connection and have second nut (242) directly over second screw rod (241).