阅读说明：本技术 一种矿用履带式可伸缩自移机尾 (Mining crawler-type telescopic self-moving tail ) 是由 杨韬仁 高爱红 曹为 张小刚 杨敬伟 张晓鹍 李利范 刘斌 于 2021-01-18 设计创作，主要内容包括：本发明公开了一种矿用履带式可伸缩自移机尾,包括通过销轴依次固定连接的机头部、伸缩部、机尾部和储带仓；所述机尾部上方设置有集控中心；所述机头部、伸缩部、机尾部和储带仓上套接有传输皮带；本发明的矿用履带式可伸缩自移机尾,采用剪式伸缩机构用于矿用可伸缩自移机尾；套筒滚子链作为自移机尾履带应用；集控中心用于矿用可伸缩自移机尾；本发明的矿用履带式可伸缩自移机尾,能适应井下的恶劣工况,可以实现自移机尾的自动伸缩,以减少移机次数、增加搭接长度,并且在具有较强的通过性的同时在高度方向和宽度方向能够满足限制要求；同时装有集控中心,不仅可以操作自移机尾的行走及自动伸缩,还可以操作高效快速掘进系统中其它装备。(The invention discloses a mining crawler-type telescopic self-moving tail, which comprises a head part, a telescopic part, a tail part and a belt storage bin, wherein the head part, the telescopic part, the tail part and the belt storage bin are fixedly connected in sequence through pin shafts; a centralized control center is arranged above the tail part of the machine; the head part, the telescopic part, the tail part and the belt storage bin are sleeved with transmission belts; the mining crawler-type telescopic self-moving tail adopts a shear type telescopic mechanism to be used for the mining telescopic self-moving tail; the sleeve roller chain is used as a self-moving tail track; the centralized control center is used for the mining telescopic self-moving tail; the mining crawler-type telescopic self-moving tail can adapt to underground severe working conditions, can realize automatic telescopic of the self-moving tail so as to reduce the times of moving the tail and increase the lap joint length, and can meet the restriction requirements in the height direction and the width direction while having strong trafficability; meanwhile, a centralized control center is arranged, so that the self-moving tail can be operated to walk and automatically stretch, and other equipment in a high-efficiency rapid tunneling system can be operated.)

1. The utility model provides a mining crawler-type is scalable from moving tail which characterized in that: comprises a nose part, a telescopic part, a tail part and a belt storage bin which are fixedly connected in sequence through a pin shaft; a centralized control center is arranged above the tail part of the machine; the head part, the telescopic part, the tail part and the belt storage bin are sleeved with transmission belts;

the machine head part and the machine tail part comprise rigid frame units, and a row of carrier roller sets are arranged at the upper parts of the rigid frame units at intervals through roller seats; the lower part of the rigid frame unit is provided with a sleeve roller chain type crawler belt for driving the rigid frame unit to move; the driving end of the sleeve roller chain type crawler belt is provided with a gear box; the gear box is driven by a walking motor; a turnabout roller is arranged on one side, away from the telescopic part, of the rigid frame unit of the nose part through a bearing seat;

the telescopic parts comprise a plurality of sections of telescopic groups, and adjacent telescopic groups are connected and fixed through pin bosses and pin shafts; the telescopic group comprises a plurality of frame frames with hollow top surfaces; each frame is provided with a carrier roller group through a roller seat; telescopic guide rails are fixed at the tops of two sides of the frame through triangular supporting plates; brackets are fixed on two sides of the frame; the scissor type telescopic mechanism is arranged on the bracket; the bottom of the bracket is provided with a rubber wheel through a wheel seat;

the belt storage bin comprises a belt storage rigid frame, and a row of carrier roller sets are mounted at the top of the belt storage rigid frame through roller seats; a plurality of rows of sliding grooves are oppositely arranged on the storage belt rigid frame; a belt loading mechanism is arranged in each sliding groove in a sliding manner; one side of the belt storage rigid frame, which is close to the tail part of the machine, is provided with a row of end rollers through a bearing; the bottom of the belt storage rigid frame is provided with a rubber wheel;

the conveying belt sequentially passes through a bend pulley, a nose part, a telescopic part and a carrier roller group on a tail part, is sleeved on the belt feeding mechanism and the end roller in a reciprocating manner, and returns to the bend pulley again to form a closed-loop belt;

the centralized control center comprises a cabin, a driving position arranged on the inner side of the cabin, an explosion-proof computer controlled by the whole machine, a display communicated with the computer and an operation panel.

2. The mining crawler-type telescopic self-moving tail according to claim 1, characterized in that: the sleeve roller chain type crawler comprises a driving chain wheel shaft and a driven chain wheel shaft which are arranged at two ends of the rigid frame unit through bearings; the driving chain wheel shaft is provided with driving chain wheels at two sides in the rigid frame unit; driven chain wheels are arranged on two sides of the driven chain wheel shaft in the rigid frame unit; a gear box is arranged at the driving end of the driving chain wheel shaft; a sleeve roller chain type crawler belt is sleeved between the driving chain wheel and the driven chain wheel; a track shoe is fixed between the two sleeve roller chain type tracks at intervals through bolts, flat pads and nuts; the rigid frame unit is of a separated structure close to one side of the driving chain wheel shaft, a swing oil cylinder is arranged at the separation position of the rigid frame unit, and a pump station and an oil tank which provide power for each oil cylinder are arranged on one side of the rigid frame unit close to the driving chain wheel shaft.

3. The mining crawler-type telescopic self-moving tail according to claim 2, characterized in that: one end of the rigid frame unit, which is positioned at the driving chain wheel shaft, is provided with a sliding groove; the outer part of the rigid frame unit is provided with slide ways at two sides of the sliding chute; a sliding seat is arranged on the slideway in a sliding manner; the driving chain wheel shaft is arranged in the sliding groove in a sliding manner, and two ends of the driving chain wheel shaft are arranged on bearings of the sliding seat; and a track tensioning hydraulic cylinder is arranged between the sliding seat and the rigid frame unit.

4. The mining crawler-type telescopic self-moving tail according to claim 1, characterized in that: the telescopic guide rail comprises a plurality of three-section telescopic guide rails fixed at the top of the frame-shaped frame; the adjacent three sections of contraction guide rails are the same inner rail bar; the bracket comprises a first bracket and a second bracket; the first support and the second support are fixed outside the frame-shaped frame in a staggered manner respectively; the scissor type telescopic mechanism comprises a plurality of groups of scissor forks hinged in the middle, and the upper side and the lower side of each adjacent scissor fork are hinged through an upper pin shaft and a lower pin shaft respectively; the scissor type telescopic mechanism penetrates through the first support and the second support; the first support is provided with a herringbone sliding groove in sliding fit with the upper pin shaft and the lower pin shaft; the middle part of the second bracket is hinged with the middle pin of the scissor fork.

5. The mining crawler-type telescopic self-moving tail according to claim 1, characterized in that: the belt feeding mechanism comprises a traction frame in sliding or rolling fit with the sliding groove; the roller body is arranged on the traction frame through a bearing seat; the traction frame is drawn by a traction tensioning mechanism, and the traction tensioning mechanism is an oil cylinder arranged on the inner side of the belt storage rigid frame, or a gear arranged at the end part of the traction frame, and a walking rack meshed with the gear; and a motor for driving the gear to rotate.

Technical Field

The invention relates to a self-moving tail, in particular to a mining crawler-type telescopic self-moving tail, and belongs to the technical field of self-moving tails.

Background

The belt conveyor self-moving tail is suitable for quick pushing and correct lapping of a reversed loader and a conveyor tail of a fully mechanized coal mining working face, meets the requirement of quick pushing of the working face, and has the functions of adjusting belt deviation and automatically moving the reversed loader forwards; the current belt feeder is from moving tail, like chinese patent application no: 201720805883.2, discloses a self-leveling belt self-moving tail, which comprises a self-moving tail, a leveling cylinder and a self-leveling system arranged on the self-moving tail, wherein the self-leveling system adopts an angle balance detection module to respectively adjust the height of each supporting leg, thereby ensuring that the self-moving tail is in a horizontal state in real time; the tail of the existing mining crawler-type telescopic self-moving tail is connected with a bridge type reversed loader, a bent belt conveyor, a power station and the like and is overlapped and bestrided on the crawler-type self-moving tail, so that the whole weight is large, the walking resistance is large, in addition, the strong trafficability is required, the conventional non-telescopic self-moving tail is adopted, the machine moving frequency is high, and the production efficiency is seriously influenced; but also has great defects in the walking mode and is limited by the width and the height.

Disclosure of Invention

In order to solve the problems, the invention provides the mining crawler-type telescopic self-moving tail which is not limited by height and width spaces, is easy to assemble and disassemble, can realize tunneling for several days without prolonging a belt, reduces auxiliary operation time and improves tunneling efficiency.

The crawler-type telescopic self-moving machine tail for the mine is a rear supporting device designed for efficient and rapid underground coal mine tunneling work synchronous transportation, and can realize a telescopic self-moving function while tunneling for several days without prolonging a belt; the belt storage device comprises a nose part, a telescopic part, a tail part and a belt storage bin which are fixedly connected in sequence through a pin shaft; a centralized control center is arranged above the tail part of the machine; the head part, the telescopic part, the tail part and the belt storage bin are sleeved with transmission belts;

the machine head part and the machine tail part comprise rigid frame units, and a row of carrier roller sets are arranged at the upper parts of the rigid frame units at intervals through roller seats; the lower part of the rigid frame unit is provided with a sleeve roller chain type crawler belt for driving the rigid frame unit to move; the driving end of the sleeve roller chain type crawler belt is provided with a gear box; the gear box is driven by a walking motor; a turnabout roller is arranged on one side, away from the telescopic part, of the rigid frame unit of the nose part through a bearing seat; the sleeve roller chain type crawler belt is formed by hinging a sleeve roller chain and a crawler plate, the crawler belt is contacted with the ground to ensure the realization of a self-moving function, the bend pulley realizes belt reversing, the carrier roller supports the conveying belt to ensure the conveying belt to realize a coal conveying function, the rigid frame units are connected end to end through the pin shafts, and enough strength and rigidity are provided to ensure that the bridge type reversed loader slides on the rigid frame units; the head part and the tail part are driven by a walking motor, power is transmitted to the chain wheel through the gear box, the chain wheel drives the track to drive the whole machine to walk, the head part and the tail part can respectively and independently walk, automatic stretching of the stretching part is realized through the speed difference between the head part and the tail part, and in the walking process, if the moving direction deviates, the swing oil cylinder can be used for timely correcting the deviation.

The telescopic parts comprise a plurality of sections of telescopic groups, and adjacent telescopic groups are connected and fixed through pin bosses and pin shafts; the telescopic group comprises a plurality of frame frames with hollow top surfaces; each frame is provided with a carrier roller group through a roller seat; telescopic guide rails are fixed at the tops of two sides of the frame through triangular supporting plates; brackets are fixed on two sides of the frame; the scissor type telescopic mechanism is arranged on the bracket; the bottom of the bracket is provided with a rubber wheel through a wheel seat; the scissor type telescopic mechanism and the telescopic guide rail jointly realize free telescopic of the frame-shaped frame, the rubber wheels and the frame-shaped frame provide support for the frame-shaped frame, and sufficient strength is guaranteed for supporting the bridge type transfer conveyor and the transported coal.

The belt storage bin comprises a belt storage rigid frame, and a row of carrier roller sets are mounted at the top of the belt storage rigid frame through roller seats; a plurality of rows of sliding grooves are oppositely arranged on the storage belt rigid frame; a belt loading mechanism is arranged in each sliding groove in a sliding manner; one side of the belt storage rigid frame, which is close to the tail part of the machine, is provided with a row of end rollers through a bearing; the bottom of the belt storage rigid frame is provided with a rubber wheel; the belt loading mechanism can synchronously realize the automatic extension and retraction of the belt when the extension and retraction part automatically extends and retracts;

the conveying belt sequentially passes through a bend pulley, a nose part, a telescopic part and a carrier roller group on a tail part, is sleeved on the belt feeding mechanism and the end roller in a reciprocating manner, and returns to the bend pulley again to form a closed-loop belt;

the centralized control center comprises a cabin, a driving position arranged on the inner side of the cabin, an explosion-proof computer controlled by the whole machine, a display communicated with the computer and an operation panel; the automatic moving machine tail can be operated to walk and automatically stretch, other equipment of the rapid tunneling system can be connected into a computer, the working states of the other equipment of the high-efficiency rapid tunneling system can be checked through a display, and the operation can be carried out through a control panel; meanwhile, the system can be used as a signal relay to perform signal transmission control with the ground, so that remote control is realized.

Further, the sleeve roller chain type caterpillar comprises a driving chain wheel shaft and a driven chain wheel shaft which are arranged at two ends of the rigid frame unit through bearings; the driving chain wheel shaft is provided with driving chain wheels at two sides in the rigid frame unit; driven chain wheels are arranged on two sides of the driven chain wheel shaft in the rigid frame unit; a gear box is arranged at the driving end of the driving chain wheel shaft; a sleeve roller chain type crawler belt is sleeved between the driving chain wheel and the driven chain wheel; a track shoe is fixed between the two sleeve roller chain type tracks at intervals through bolts, flat pads and nuts; one side of the rigid frame unit, which is close to the driving chain wheel shaft, is of a separated structure, a swing oil cylinder is arranged at the separation part of the rigid frame unit, and a pump station and an oil tank which are used for providing power for each oil cylinder are arranged at one side of the rigid frame unit, which is close to the driving chain wheel shaft; the traveling motor drives the gear box to rotate, the gear box drives the driving chain wheel shaft to rotate, the driving chain wheel shaft rotates to drive the driving chain wheel to rotate, the driving chain wheel drives the driven chain wheel and the driven chain wheel shaft to rotate through the sleeve roller chain type crawler belt, and when the driving chain wheel rotates, a crawler plate of the sleeve roller chain type crawler belt is in contact with the ground, so that the head part and the tail part of the tractor are driven to move forwards or backwards; when deviation occurs, the deviation is corrected through the swing oil cylinder.

Furthermore, one end of the rigid frame unit, which is arranged at the driving chain wheel shaft, is provided with a sliding groove; the outer part of the rigid frame unit is provided with slide ways at two sides of the sliding chute; a sliding seat is arranged on the slideway in a sliding manner; the driving chain wheel shaft is arranged in the sliding groove in a sliding manner, and two ends of the driving chain wheel shaft are arranged on bearings of the sliding seat; a track tensioning hydraulic cylinder is arranged between the sliding seat and the rigid frame unit; when the crawler is required to be tensioned, the crawler tensioning hydraulic cylinder applies force to the sliding block, so that the sliding block is jacked upwards, the driving chain wheel shaft can slide upwards along the sliding groove, and the driving chain wheel shaft on the sliding block is tensioned with the sleeve roller chain type crawler.

Furthermore, the telescopic guide rail comprises a plurality of three-section telescopic guide rails fixed at the top of the frame type frame; the adjacent three sections of contraction guide rails are the same inner rail bar; the bracket comprises a first bracket and a second bracket; the first support and the second support are fixed outside the frame-shaped frame in a staggered manner respectively; the scissor type telescopic mechanism comprises a plurality of groups of scissor forks hinged in the middle, and the upper side and the lower side of each adjacent scissor fork are hinged through an upper pin shaft and a lower pin shaft respectively; the scissor type telescopic mechanism penetrates through the first support and the second support; the first support is provided with a herringbone sliding groove in sliding fit with the upper pin shaft and the lower pin shaft; the middle part of the second support is hinged with the middle pin of the shear fork, when adjacent frame frames shrink, the three-section shrinkage guide rail shrinks, the middle pin of the shear fork is positioned in the middle part of the second support, and the upper pin shaft and the lower pin shaft of the shear fork slide up and down along the first support, so that the shear type telescopic mechanism is pressed and shrunk.

Further, the belt loading mechanism comprises a traction frame in sliding or rolling fit with the sliding groove; the roller body is arranged on the traction frame through a bearing seat; the traction frame is drawn by a traction tensioning mechanism, and the traction tensioning mechanism is an oil cylinder arranged on the inner side of the belt storage rigid frame, or a gear arranged at the end part of the traction frame, and a walking rack meshed with the gear; and a motor for driving the gear to rotate.

Compared with the prior art, the mining crawler-type telescopic self-moving tail provided by the invention adopts the shear type telescopic mechanism to be used for the mining telescopic self-moving tail; the sleeve roller chain is used as a self-moving tail track; the centralized control center is used for the mining telescopic self-moving tail; the mining crawler-type telescopic self-moving tail can adapt to underground severe working conditions, can realize automatic telescopic of the self-moving tail so as to reduce the times of moving the tail and increase the lap joint length, and can meet the restriction requirements in the height direction and the width direction while having strong trafficability; meanwhile, a centralized control center is arranged, so that the self-moving tail can be operated to walk and automatically stretch, and other equipment in a high-efficiency rapid tunneling system can be operated.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the overall structure of the nose portion 1 of the present invention.

FIG. 3 is a schematic view of the enlarged view of FIG. 2A according to the present invention.

FIG. 4 is a schematic view of the enlarged view of FIG. 2B according to the present invention.

Fig. 5 is a schematic view of the construction of the telescopic roller chain track of the present invention.

FIG. 6 is a schematic view of the installation structure of the adjacent telescopic groups of the telescopic part of the present invention.

FIG. 7 is a schematic view of a telescopic assembly according to the present invention.

FIG. 8 is a schematic view of the tape storage magazine according to the present invention.

Detailed Description

Example 1:

the crawler-type telescopic self-moving tail for the mine as shown in fig. 1 to 8 is a rear supporting device designed for synchronous transportation of efficient and rapid tunneling work under a coal mine, and achieves a telescopic self-moving function while tunneling for several days without prolonging a belt; the belt storage device comprises a nose part 1, a telescopic part 2, a tail part 3 and a belt storage bin 4 which are fixedly connected in sequence through a pin shaft; a centralized control center 5 is arranged above the tail part 3; the head part 1, the telescopic part 2, the tail part 3 and the belt storage bin 4 are sleeved with transmission belts;

the nose part 1 and the tail part 3 comprise rigid frame units 11, and a row of carrier roller sets 12 are arranged at the upper parts of the rigid frame units 11 at intervals through roller seats; the lower part of the rigid frame unit 11 is provided with a sleeve roller chain type crawler belt 13 for driving the rigid frame unit to move; a gear box 14 is arranged at the driving end of the sleeve roller chain type crawler 13; the gear box 14 is driven by a walking motor; a turnabout drum 15 is arranged on one side, away from the telescopic part, of the rigid frame unit of the nose part 11 through a bearing seat; the sleeve roller chain type crawler belt is formed by hinging a sleeve roller chain and a crawler plate, the crawler belt is contacted with the ground to ensure the realization of a self-moving function, the bend pulley realizes belt reversing, the carrier roller supports the conveying belt to ensure the conveying belt to realize a coal conveying function, the rigid frame units are connected end to end through the pin shafts, and enough strength and rigidity are provided to ensure that the bridge type reversed loader slides on the rigid frame units; the head part and the tail part are driven by a walking motor, power is transmitted to the chain wheel through the gear box, the chain wheel drives the track to drive the whole machine to walk, the head part and the tail part can respectively and independently walk, automatic stretching of the stretching part is realized through the speed difference between the head part and the tail part, and in the walking process, if the moving direction deviates, the swing oil cylinder can be used for timely correcting the deviation.

The telescopic part 2 comprises a plurality of sections of telescopic groups, and adjacent telescopic groups are connected and fixed through pin bosses and pin shafts; the telescopic group comprises a plurality of frame frames 21 with hollow top surfaces; each frame 21 is provided with a carrier roller group 12 through a roller seat; telescopic guide rails 23 are fixed at the tops of two sides of the frame 21 through three gusset plates 22; two sides of the frame 21 are fixed with brackets 24; a scissor type telescopic mechanism 25 is arranged on the bracket 24; the bottom of the bracket 24 is provided with a rubber wheel 26 through a wheel seat; the scissor type telescopic mechanism and the telescopic guide rail jointly realize free telescopic of the frame-shaped frame, the rubber wheels and the frame-shaped frame provide support for the frame-shaped frame, and sufficient strength is guaranteed for supporting the bridge type transfer conveyor and the transported coal.

The belt storage bin 4 comprises a belt storage rigid frame 41, and the top of the belt storage rigid frame 41 is provided with a row of carrier roller sets 12 through roller seats; a plurality of rows of sliding grooves 42 are oppositely arranged on the belt storage rigid frame 41; a belt loading mechanism 43 is arranged in each sliding groove 42 in a sliding manner; one side of the belt storage rigid frame 41 close to the tail part is provided with a row of end rollers 44 through bearings; the bottom of the tape storage rigid frame 41 is provided with a rubber wheel 26; the belt loading mechanism can synchronously realize the automatic extension and retraction of the belt when the extension and retraction part automatically extends and retracts;

the conveying belt sequentially passes through a direction-changing drum 15, a nose part 1, a telescopic part 2 and a carrier roller group 12 on a tail part 3, is sleeved on a belt feeding mechanism and an end roller in a reciprocating manner, and then returns to the direction-changing drum again to form a closed-loop belt;

the centralized control center 5 comprises a cabin, a driving position arranged on the inner side of the cabin, an explosion-proof computer controlled by the whole machine, a display communicated with the computer and an operation panel; the automatic moving machine tail can be operated to walk and automatically stretch, other equipment of the rapid tunneling system can be connected into a computer, the working states of the other equipment of the high-efficiency rapid tunneling system can be checked through a display, and the operation can be carried out through a control panel; meanwhile, the system can be used as a signal relay to perform signal transmission control with the ground, so that remote control is realized.

Wherein the bush roller chain type track 13 includes a driving sprocket shaft 131 and a driven sprocket shaft 132 mounted to both ends of the rigid frame unit through bearings; the driving chain wheel shaft 131 is provided with driving chain wheels 133 at two sides in the rigid frame unit; driven sprockets 134 are arranged on two sides of the driven sprocket shaft 132 in the rigid frame unit; the driving end of the driving chain wheel shaft 131 is provided with a gear box 14; a sleeve roller chain type crawler belt 135 is sleeved between the driving chain wheel 133 and the driven chain wheel 134; a track shoe 136 is fixed between the two sleeve roller chain type tracks 135 at intervals through bolts, flat pads and nuts 137; one side of the rigid frame unit 11, which is close to the driving chain wheel shaft, is of a separated structure, a swing oil cylinder 138 is arranged at the separation position of the rigid frame unit 11, and a pump station 139 and an oil tank 1391 which are used for providing power for each oil cylinder are arranged on one side of the rigid frame unit 11, which is close to the driving chain wheel shaft; the traveling motor drives the gear box to rotate, the gear box drives the driving chain wheel shaft to rotate, the driving chain wheel shaft rotates to drive the driving chain wheel to rotate, the driving chain wheel drives the driven chain wheel and the driven chain wheel shaft to rotate through the sleeve roller chain type crawler belt, and when the driving chain wheel rotates, a crawler plate of the sleeve roller chain type crawler belt is in contact with the ground, so that the head part and the tail part of the tractor are driven to move forwards or backwards; when deviation occurs, the deviation is corrected through the swing oil cylinder.

One end of the rigid frame unit 11 on the driving chain wheel shaft is provided with a sliding groove 111; the outside of the rigid frame unit is provided with slide rails 112 at two sides of the sliding groove; a sliding seat 113 is arranged on the sliding rail 112 in a sliding manner; the driving sprocket shaft 131 is slidably disposed in the sliding groove 111, and both ends of the driving sprocket shaft are mounted on bearings of the sliding base 113; a track tensioning hydraulic cylinder 114 is arranged between the sliding seat 113 and the rigid frame unit 11; when the crawler is required to be tensioned, the crawler tensioning hydraulic cylinder applies force to the sliding block, so that the sliding block is jacked upwards, the driving chain wheel shaft can slide upwards along the sliding groove, and the driving chain wheel shaft on the sliding block is tensioned with the sleeve roller chain type crawler.

The telescopic guide rail 23 comprises a plurality of three-section telescopic guide rails 231 fixed on the top of the frame; the adjacent three-section contraction guide rail 231 is the same inner rail strip 2311; the holder 24 includes a first holder 241 and a second holder 242; the first brackets 241 and the second brackets 242 are fixed outside the frame 21 in a staggered manner; the scissor type telescopic mechanism 25 comprises a plurality of groups of scissor forks 251 hinged in the middle, and the upper side and the lower side of the adjacent scissor forks are hinged through upper pin shafts 252 and lower pin shafts 252 respectively; the scissor type telescopic mechanism penetrates through the first support 241 and the second support 242; the first bracket 241 is provided with a Chinese character ri-shaped sliding groove 2411 in sliding fit with the upper pin shaft and the lower pin shaft; the middle part of the second support 242 is hinged with a middle pin of the scissors fork, when adjacent frame frames shrink, the three-section shrinking guide rail shrinks, the middle pin of the scissors fork is positioned in the middle of the second support, and an upper pin shaft and a lower pin shaft of the scissors fork slide up and down along the first support, so that the scissors telescopic mechanism is pressed and shrunk.

The belt loading mechanism 43 comprises a traction frame in sliding or rolling fit with the chute; the roller body is arranged on the traction frame through a bearing seat; the traction frame is drawn by a traction tensioning mechanism, and the traction tensioning mechanism is an oil cylinder arranged on the inner side of the belt storage rigid frame, or a gear arranged at the end part of the traction frame, and a walking rack meshed with the gear; and a motor for driving the gear to rotate.

The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.