CN115649900A

CN115649900A - Opencut coal mining conveying system

Info

Publication number: CN115649900A
Application number: CN202211218297.XA
Authority: CN
Inventors: 魏圣杰; 董帅; 张雷; 王安尧; 刘玉和; 庄冀; 王传琳; 白迪
Original assignee: Huaneng Yimin Coal and Electricity Co Ltd
Current assignee: Huaneng Yimin Coal and Electricity Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-31
Also published as: LU504010B1

Abstract

The invention discloses an opencast coal mining conveying system which comprises a mining module, a conveying module and a separating module, wherein the mining module is used for mining coal mines from an opencast mine field and conveying the mined coal mines to the conveying module, the mining module comprises a crushing unit and a collecting unit, the conveying module comprises a coal collecting unit and a conveying unit arranged on the side face of the coal collecting unit, and the separating module is used for actively conveying the conveying unit and a middle connecting unit. The device provided by the invention adopts the mining module to mine and collect the open pit coal mine, conveys the mined coal mine to the separation module for separation after passing through the transportation module, and separately loads the large coal mine and the small coal mine, so that the subsequent processing is facilitated; the separation module is provided with two sets of active conveying units, one set of active conveying unit can rotate, the coal mine can be moved backwards quickly by utilizing gravity, the coal mine can be prevented from being stacked at the front end of the separation module, and the screening efficiency is higher.

Description

Opencut coal mining conveying system

Technical Field

The invention relates to the technical field of coal mine fully mechanized mining, in particular to an opencast coal mining conveying system.

Background

At present, current coal mine transportation is mining through the mining machine, then transport all collieries to mill and process, but because the colliery of mining has big or small, transport to mill after, still need sieve it, then just can drop into the breaker of corresponding specification and carry out the breakage, the process is too loaded down with trivial details, and still some great collieries can appear, can't be broken by small-scale breaker at all, can only throw away, very big extravagant cost of transportation, the loss in unnecessary manpower and the financial resources has been caused.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and title of the application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the above and/or other problems with existing opencut coal mining conveyor systems.

The problem to be solved by the present invention is therefore how to provide an opencut coal mining conveyor system.

In order to solve the technical problems, the invention provides the following technical scheme: an opencast coal mining conveying system comprises a mining module, a crushing unit and a collecting unit, wherein the crushing unit comprises a crushing roller, a rocker arm connected with the crushing roller and a mining machine main body connected with the rocker arm, the collecting unit comprises an ore collecting rotating wheel arranged at the bottom and a first conveying belt arranged below the ore collecting rotating wheel, the first conveying belt is arranged at the bottom of the mining machine main body in a lifting mode, and the ore collecting rotating wheel is connected to the front of the mining machine main body through a hydraulic contraction rod; the transportation module is arranged behind the first conveying belt and is used for conveying the coal mine mined by the mining module; the separation module is arranged behind the transportation module and used for screening a coal mine, and comprises an active conveying unit and an intermediate connecting unit, wherein the active conveying unit comprises a first supporting component, a rotating roller component and a driven roller which are matched with the first supporting component, a driving adjusting part which is matched with the rotating roller component, and the intermediate connecting unit comprises an intermediate support which is connected with the first supporting component and an expansion rod which is hinged to the first supporting component and the intermediate support.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the transportation module including collection coal unit with set up in the transportation unit of collection coal unit side, collection coal unit is including collection coal bunker and fixed bolster, collection coal bunker fixed connection be in on the fixed bolster, collection coal bunker bottom is provided with the coal outlet, the coal outlet with the transportation unit cooperation.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the transportation unit is obliquely arranged, and the coal outlet is arranged at the bottom of the transportation unit.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the coal collecting bin is also provided with a baffle used for shielding the coal outlet, and the baffle is in sliding fit with the coal collecting bin.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the drive regulating part comprises a cross rod connected with the rotating roller component, a first gear coaxially arranged with the rotating roller component, two adjacent second gears arranged between the first gears, a first sliding block arranged at the end part of the rotating roller component, a second sliding block arranged at the end part of the driven roller, and a chain connecting the two adjacent second sliding blocks, wherein the end parts of the cross rod are hinged through a hinged shaft, the second gear is connected onto the hinged shaft, the second gear is meshed with the two adjacent first gears at the same time, and the first sliding block and the second sliding block with the minimum distance are connected through the chain.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the first support assembly comprises a movable support leg, a fixed support leg and a bearing support, the bearing support is hinged with the movable support leg or fixedly connected with the fixed support leg, and a driven roller arranged at the end part of the bearing support is fixedly connected on the bearing support; the side surface of the bearing bracket is provided with a first moving groove, the first sliding block and the second sliding block are arranged in the bearing bracket, the end part of one bearing bracket is hinged on the middle support, and a hinged shaft is coaxial with the driven roller arranged at the end part.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: drive adjusting part is still including driving it carries out the first driving piece of pivoted to rotate the roller set, and drives it carries out the second driving piece that removes to rotate roller set and driven voller, the second driving piece is including fixing bear the motor of support side, with the threaded rod that motor output end is connected, with threaded rod screw-thread fit's fixture block, with threaded rod fixed connection's dwang, and be used for connecting two the universal joint of dwang, fixture block and the first slider fixed connection who sets up at the tip, be provided with the confession on the bearing support the second shifting chute that the fixture block removed, the universal joint sets up bear the articulated shaft department of support and intermediate support.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the live-rollers subassembly includes first live-rollers and second live-rollers, first live-rollers and the crisscross setting of second live-rollers, be provided with first oval dish along its axial array on the first live-rollers, be provided with the oval dish of second along its axial array on the second live-rollers, first oval dish with the oval dish of second is crisscross to be set up.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the driving conveying unit further comprises a transmission assembly connected with the two rotating roller assemblies, the transmission assembly comprises a third gear fixed on the first rotating roller rotating shaft, a fourth gear and a fifth gear fixed on the driven roller rotating shaft, a sixth gear fixed on the bearing support and meshed with the fourth gear and the first gear, a chain connected with the fifth gear and the third gear, and a tension wheel used for keeping the chain tight, and the tension wheel is hinged to the bearing support.

As a preferable aspect of the open pit coal mining conveyor system of the present invention, wherein: the active conveying unit further comprises a shielding plate fixedly connected to the bearing support, the movable supporting leg comprises a first support column, a second support column and a fastening bolt, the first support column and the second support column are in sliding fit, and a plurality of first holes are vertically formed in the first support column.

The invention has the beneficial effects that: the open pit coal mine is mined and collected through the mining module, the mined coal mine is conveyed to the separation module for separation after passing through the transportation module, and a large coal mine and a small coal mine are loaded separately, so that the subsequent processing is facilitated; be provided with two sets of initiative conveying unit in the separation module, one of them set of initiative conveying unit can rotate, utilizes gravity to make the colliery remove backward fast, can prevent that the colliery from piling up at the front end of separation module, and screening efficiency is higher.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a block diagram of a opencast coal mining conveyor system.

Fig. 2 is a block diagram of a mining module of an open pit coal mining conveyor system.

FIG. 3 is a block diagram of a portion of a transport module of a opencast coal mining conveyor system.

FIG. 4 is an overall schematic view of a separation module of the opencast coal mining conveyor system.

FIG. 5 is a schematic view of the separation module of the opencast coal mining conveyor system when not tilted.

FIG. 6 is a first support assembly configuration view of the opencast coal mining conveyor system

Fig. 7 is a block diagram of a second drive member of the opencast coal mining conveyor system.

FIG. 8 is a schematic view of a first gear and a second gear of a opencast coal mining conveyor system.

FIG. 9 is a block diagram of a drive assembly of the opencast coal mining conveyor system.

Fig. 10 is a schematic view of the chain and hinge axes of an opencast coal mining conveyor system.

FIG. 11 is a separation module diagram from another perspective of a opencast coal mining conveyor system.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures of the present invention are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 11, a first embodiment of the present invention provides an opencast coal mining conveyor system including a mining module a for mining a coal mine from an opencast mine site and conveying the mined coal to a transport module B for controlling the coal mine conveying capacity and raising a conveying end so that an active conveying unit 300 in the separation module C can be tilted, and a separation module C for screening the coal mine.

Specifically, the mining module a includes a crushing unit 100 and a collecting unit 200, the crushing unit 100 includes a crushing roller 101, a rocker arm 102 connected with the crushing roller 101, and a mining machine main body 103 connected with the rocker arm 102, the collecting unit 200 includes an ore collecting runner 201 disposed at the bottom, and a first conveying belt 202 disposed below the ore collecting runner 201, the first conveying belt 202 is disposed at the bottom of the mining machine main body 103 in a liftable manner, and the ore collecting runner 201 is connected in front of the mining machine main body 103 through a hydraulic contraction rod 203.

The transportation module B is arranged behind the first conveying belt 202 and comprises a coal collecting unit 500 and a transportation unit 600 arranged on the side face of the coal collecting unit 500, the coal collecting unit 500 comprises a coal collecting bin 501 and a fixed support 502, the coal collecting bin 501 is fixedly connected to the fixed support 502, a coal outlet 501a is formed in the bottom of the coal collecting bin 501, and the coal outlet 501a is matched with the transportation unit 600. The transportation unit 600 is disposed obliquely, and the coal outlet 501a is disposed at the bottom of the transportation unit 600. Preferably, the coal collecting bin 501 is further provided with a baffle 501b for shielding the coal outlet 501a, the baffle 501b is in sliding fit with the coal collecting bin 501, and the amount of coal mine falling on the active conveying unit 300 in unit time can be adjusted by changing the range of shielding the coal outlet 501a by the baffle 501 b.

The separation module C comprises an active conveying unit 300 and an intermediate connecting unit 400, wherein the active conveying unit 300 comprises a first supporting assembly 301, a rotating roller assembly 302 and a driven roller 304 matched with the first supporting assembly 301, a driving adjusting member 303 matched with the rotating roller assembly 302, the intermediate connecting unit 400 comprises an intermediate support 401 connected with the two first supporting assemblies 301, and a telescopic rod 402 hinged on one first supporting assembly 301 and the intermediate support 401.

The driving adjusting member 303 includes a cross bar 303a connected to the rotating roller assembly 302, a first gear 303b coaxially disposed with the rotating roller assembly 302, a second gear 303c disposed between two adjacent first gears 303b, a first slider 303d disposed at an end of the rotating roller assembly 302, a second slider 303f disposed at an end of the driven roller 304, and a link 303h connecting two adjacent second sliders 303f, ends of two adjacent cross bars 303a are hinged by a hinge shaft 303e, the second gear 303c is connected to the hinge shaft 303e, and the second gear 303c is simultaneously engaged with two adjacent first gears 303b, and the first slider 303d and the second slider 303f having the smallest distance are connected by the link 303 h.

The first supporting assembly 301 comprises a movable supporting leg 301a, a fixed supporting leg 301b and a bearing bracket 301c, the bearing bracket 301c is hinged with the movable supporting leg 301a or fixedly connected with the fixed supporting leg 301b, a driven roller 304 arranged at the end part of the bearing bracket 301c is fixedly connected on the bearing bracket 301c, a first moving groove 301c-1 is arranged at the side surface of the bearing bracket 301c, a first sliding block 303d and a second sliding block 303f are arranged in the bearing bracket 301c, the end part of one bearing bracket 301c is hinged on the middle support 401, and a hinged shaft is coaxial with the driven roller 304 arranged at the end part.

Further, the driving adjustment member 303 further includes a first driving member 303i for driving the rotating roller assembly 302 to rotate, and a second driving member 303j for driving the rotating roller assembly 302 and the driven roller 304 to move, the second driving member 303j includes a motor 303j-1 fixed on a side surface of the supporting bracket 301c, a threaded rod 303j-2 connected to an output end of the motor 303j-1, a block 303j-3 in threaded engagement with the threaded rod 303j-2, a rotating rod 303j-4 fixedly connected to the threaded rod 303j-2, and a universal joint 303j-5 for connecting the two rotating rods 303j-4, the block 303j-3 is fixedly connected to a first slider 303d disposed at an end portion, a second moving groove 301c-2 for moving the block 303j-3 is disposed on the supporting bracket 301c, and the universal joint 303j-5 is disposed at a joint axis of the supporting bracket 301c and the intermediate support 401. In this embodiment, the first driving member 303i is a motor.

Preferably, the rotating roller assembly 302 comprises a first rotating roller 302a and a second rotating roller 302b, the first rotating roller 302a and the second rotating roller 302b are arranged in a staggered manner, a first elliptical disk 302a-1 is arranged on the first rotating roller 302a along the axial array thereof, a second elliptical disk 302b-1 is arranged on the second rotating roller 302b along the axial array thereof, and the first elliptical disk 302a-1 and the second elliptical disk 302b-1 are arranged in a staggered manner.

The active transport unit 300 further includes a driving assembly 305 connecting the two rotating roller assemblies 302, the driving assembly 305 including a third gear 305a fixed on a rotating shaft of the first rotating roller 302a, a fourth gear 305b and a fifth gear 305c fixed on a rotating shaft of the driven roller 304, a sixth gear 305d fixed on the carrying bracket 301c and simultaneously engaged with the fourth gear 305b and the first gear 303b, a chain 305e connecting the fifth gear 305c and the third gear 305a, and a tension pulley 305f for keeping the chain 305e tight, the tension pulley 305f being hinged on the carrying bracket 301 c. The active conveying unit 300 further comprises a shielding plate 306 fixedly connected to the bearing support 301c, the movable supporting leg 301a comprises a first supporting column 301a-1, a second supporting column 301a-2 and a fastening bolt 302a-3, the first supporting column 301a-1 and the second supporting column 301a-2 are in sliding fit, and a plurality of first holes 301a-11 are vertically formed in the first supporting column 301 a-1.

It is to be noted that the driven rollers 304 can still rotate when the distance between the adjacent second sliders 303f is the minimum, and the distance between the adjacent driven rollers 304 is the maximum when the distance between the adjacent second sliders 303f is the maximum, but the maximum distance between the adjacent driven rollers 304 is still smaller than the minimum distance between the first rotating roller 302a and the second rotating roller 302 b.

It should be noted that most of the driven rollers 304 are not rotated and only play a role of intermediate reception, and preferably, the driven rollers 304 may not be provided on the non-inclined carrying bracket 301 c.

When the coal mine screening device is used, the separation module C is adjusted, the motor 303j-1 is controlled to drive the threaded rod 303j-2 to rotate, the rotating roller assembly 302 is driven to move through the clamping block 303j-3, under the action of the cross rod 303a, the distance between the first rotating roller 302a and the second rotating roller 302b in the rotating roller assembly 302 is kept constant, after the distance between the first rotating roller 302a and the second rotating roller 302b meets the requirement, the bearing bracket 301C on one side of the middle support 401 is rotated through the telescopic rod 402, the inclination degree of the bearing bracket 301C is adjusted according to the quantity of coal mines falling on the rotating roller assembly 302 at the same time, if the quantity of coal mines falling at the same time is small, the inclination degree of the bearing bracket 301C is not too large, if the quantity of coal mines falling at the same time is large, the inclination degree of the bearing bracket 301C is slightly large, after the inclination degree is adjusted, the second support column 301a-2 is lengthened, the first support column 302a-3 is used for fixing the inclined bearing bracket 301C, then the first gear 303i is opened, the first gear assembly 303i and the driving component 303i and the rotating roller assembly 300 and the conveying unit are driven to rotate under the action of the coal mine screening roller assembly. After separation module C has adjusted, mining module A begins to start, carry out the exploitation to the coal mine through crushing cylinder 101, descend ore collection runner 201 and first conveyer belt 202 to the bottom surface of will laminating soon, ore collection runner 201 is a little higher than first conveyer belt 202, rotate through ore collection runner 201, concentrate the coal mine that falls scattered subaerial to first conveyer belt 202 on and carry the coal mine to coal collecting bin 501 through first conveyer belt 202, adjust out the opening size of coal mouth 501a, make the coal mine fall on the initiative conveying unit 300 of slope through transportation unit 600, sieve the coal mine through separation module C, then with the coal mine after sieving the loading respectively transport to follow-up processing factory can.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. An opencut coal mining conveying system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the mining module (A) comprises a crushing unit (100) and a collecting unit (200), wherein the crushing unit (100) comprises a crushing roller (101), a rocker arm (102) connected with the crushing roller (101) and a mining machine main body (103) connected with the rocker arm (102), the collecting unit (200) comprises an ore collecting rotating wheel (201) arranged at the bottom and a first conveying belt (202) arranged below the ore collecting rotating wheel (201), the first conveying belt (202) can be arranged at the bottom of the mining machine main body (103) in a lifting mode, and the ore collecting rotating wheel (201) is connected in front of the mining machine main body (103) through a hydraulic contraction rod (203);

the transportation module (B) is arranged behind the first conveyor belt (202) and is used for conveying the coal mine mined by the mining module (A);

the separation module (C) is arranged behind the transportation module (B) and used for screening a coal mine, and comprises an active conveying unit (300) and an intermediate connecting unit (400), wherein the active conveying unit (300) comprises a first supporting assembly (301), a rotating roller assembly (302) and a driven roller (304) which are matched with the first supporting assembly (301), a driving adjusting piece (303) matched with the rotating roller assembly (302), an intermediate connecting unit (400) comprising an intermediate support (401) for connecting the first supporting assembly (301) and an expansion rod (402) hinged to the first supporting assembly (301) and the intermediate support (401).

2. The opencast coal mining conveyor system of claim 1, wherein: the transportation module (B) comprises a coal collecting unit (500) and a transportation unit (600) arranged on the side face of the coal collecting unit (500), the coal collecting unit (500) comprises a coal collecting bin (501) and a fixed support (502), the coal collecting bin (501) is fixedly connected to the fixed support (502), a coal outlet (501 a) is formed in the bottom of the coal collecting bin (501), and the coal outlet (501 a) is matched with the transportation unit (600).

3. The opencast coal mining conveyor system of claim 2, wherein: the transportation unit (600) is obliquely arranged, and the coal outlet (501 a) is arranged at the bottom of the transportation unit (600).

4. The opencast coal mining conveyor system of claim 3, wherein: the coal collecting bin (501) is further provided with a baffle (501 b) used for shielding the coal outlet (501 a), and the baffle (501 b) is in sliding fit with the coal collecting bin (501).

5. The opencast coal mining conveyor system of any one of claims 1, 2 and 4, wherein: the driving adjustment member (303) comprises a cross rod (303 a) connected with the rotating roller assembly (302), a first gear (303 b) coaxially arranged with the rotating roller assembly (302), a second gear (303 c) arranged between two adjacent first gears (303 b), a first sliding block (303 d) arranged at the end part of the rotating roller assembly (302), a second sliding block (303 f) arranged at the end part of the driven roller (304), and a chain (303 h) connecting two adjacent second sliding blocks (303 f), wherein the end parts of two adjacent cross rods (303 a) are hinged through a hinge shaft (303 e), the second gear (303 c) is connected on the hinge shaft (303 e), the second gear (303 c) is simultaneously meshed with two adjacent first gears (303 b), and the first sliding block (303 d) with the smallest distance to the second sliding block (303 f) is connected through the chain (303 h).

6. The opencast coal mining conveyor system of claim 5, wherein: the first support assembly (301) comprises a movable support leg (301 a), a fixed support leg (301 b) and a bearing support (301 c), the bearing support (301 c) is hinged with the movable support leg (301 a) or fixedly connected with the fixed support leg (301 b), and a driven roller (304) arranged at the end part of the bearing support (301 c) is fixedly connected on the bearing support (301 c);

the lateral surface of the bearing bracket (301 c) is provided with a first moving groove (301 c-1), the first sliding block (303 d) and the second sliding block (303 f) are arranged in the bearing bracket (301 c), one end of the bearing bracket (301 c) is hinged on the middle support (401), and the hinged shaft is coaxial with the driven roller (304) arranged at the end.

7. The opencut coal mining conveyor system of claim 6, wherein: the driving adjusting part (303) further comprises a first driving part (303 i) for driving the rotating roller assembly (302) to rotate, and a second driving part (303 j) for driving the rotating roller assembly (302) and the driven roller (304) to move, wherein the second driving part (303 j) comprises a motor (303 j-1) fixed on the side surface of the bearing support (301 c), a threaded rod (303 j-2) connected with the output end of the motor (303 j-1), a clamping block (303 j-3) in threaded fit with the threaded rod (303 j-2), a rotating rod (303 j-4) fixedly connected with the threaded rod (303 j-2), and a universal joint (303 j-5) for connecting the two rotating rods (303 j-4), the clamping block (303 j-3) is fixedly connected with a first sliding block (303 d) arranged at the end part, a second moving groove (301 c-2) for the clamping block (303 j-3) to move is arranged on the bearing support (301 c), and the universal joint (303 j-5) is arranged at the middle part of the bearing support (401 c).

8. The opencut coal mining conveyor system of claim 6 or 7, wherein: the rotating roller assembly (302) comprises a first rotating roller (302 a) and a second rotating roller (302 b), the first rotating roller (302 a) and the second rotating roller (302 b) are arranged in a staggered mode, a first elliptical disc (302 a-1) is arranged on the first rotating roller (302 a) along the axial array of the first rotating roller, a second elliptical disc (302 b-1) is arranged on the second rotating roller (302 b) along the axial array of the second rotating roller, and the first elliptical disc (302 a-1) and the second elliptical disc (302 b-1) are arranged in a staggered mode.

9. The opencast coal mining conveyor system of claim 8, wherein: the driving conveying unit (300) further comprises a transmission assembly (305) connecting the two rotating roller assemblies (302), wherein the transmission assembly (305) comprises a third gear (305 a) fixed on a rotating shaft of the first rotating roller (302 a), a fourth gear (305 b) and a fifth gear (305 c) fixed on a rotating shaft of the driven roller (304), a sixth gear (305 d) fixed on the bearing bracket (301 c) and meshed with the fourth gear (305 b) and the first gear (303 b) at the same time, a chain (305 e) connecting the fifth gear (305 c) and the third gear (305 a), and a tension wheel (305 f) used for keeping the chain (305 e) tight, and the tension wheel (305 f) is hinged on the bearing bracket (301 c).

10. The opencast coal mining conveyor system of claim 9, wherein: the active conveying unit (300) further comprises a shielding plate (306) fixedly connected to the bearing support (301 c), the movable supporting leg (301 a) comprises a first support column (301 a-1), a second support column (301 a-2) and a fastening bolt (302 a-3), the first support column (301 a-1) and the second support column (301 a-2) are in sliding fit, and a plurality of first holes (301 a-11) are vertically formed in the first support column (301 a-1).