阅读说明：本技术 一种自动物流输送线 (Automatic logistics conveying line ) 是由 黄波 于 2020-07-13 设计创作，主要内容包括：本发明公开了物流输送技术领域的一种自动物流输送线,包括有框架,所述框架的横截面为U型结构,所述框架内转动设置有输送辊筒,所述输送辊筒共有多根,相邻所述输送辊筒之间等间距设置,本发明通过在输送滚筒的两端设置正反向螺旋,使得货物在滚筒上的输送出现偏斜时,通过螺旋的传动力使得货物向输送滚筒的中部运动,从而避免货物与输送线的侧板进行碰撞、摩擦,通过设置的分拣设备、识别模块等结构,能够将输送的货物进行分类并输送至设定的区域,以方便后续对货物的处理,设置的辊筒同步传动机构是通过一个链条在多个导向辊以及辊筒中心轴之间进行蛇形绕接,这种设计方式相比于传统技术既降低了故障率也使得辊筒受力均匀、运动同步性高。(The invention discloses an automatic logistics conveying line in the technical field of logistics conveying, which comprises a frame, wherein the cross section of the frame is of a U-shaped structure, conveying rollers are rotationally arranged in the frame, the conveying rollers are provided with a plurality of conveying rollers, the adjacent conveying rollers are arranged at equal intervals, forward and reverse screws are arranged at two ends of the conveying rollers, so that when goods are conveyed on the rollers in a deflection state, the goods move to the middle of the conveying rollers through the transmission force of the screws, thereby avoiding collision and friction between the goods and side plates of the conveying line, the conveyed goods can be classified and conveyed to a set area through the arranged structures of sorting equipment, an identification module and the like, so as to be convenient for subsequent treatment of the goods, the arranged roller synchronous transmission mechanism is formed by performing snake-shaped winding connection between a plurality of guide rollers and a roller central shaft through a chain, compared with the traditional technology, the design mode reduces the failure rate, enables the roller to be stressed uniformly and has high movement synchronism.)

1. The utility model provides an automatic commodity circulation transfer chain, is including frame (1), its characterized in that: the cross section of the frame (1) is of a U-shaped structure, the conveying rollers (2) are rotationally arranged in the frame (1), the conveying rollers (2) are multiple in number, the conveying rollers (2) are arranged adjacently and equidistantly, the front end of a central shaft of the conveying rollers (2) is connected with a roller synchronous transmission mechanism (3), sorting equipment (4) is arranged on the right side of the frame (1), a controller (5) and an identification module (6) are arranged on the right side of a rear side plate of the frame (1) respectively, connecting seats (7) are symmetrically arranged on the left and right of the bottom end of the frame (1), the connecting seats (7) on the same side are divided into two groups which are opposite in the front and back, lifting supports (8) are installed on the connecting seats (7), adjusting rollers (9) are arranged on the lower portions of the lifting supports (8), and first magnets (10) are symmetrically arranged on the left, a second magnet (11) is arranged on the lifting support (8), and the first magnet (10) and the second magnet (11) attract each other when in contact;

the lifting support (8) comprises a telescopic frame which is divided into a left group and a right group, the telescopic frame consists of lower tubular columns (81), upper tubular columns (82) and inserting columns (83), a first cross rod (84) is fixedly connected between the two groups of lower tubular columns (81) on the left side and the right side, a second cross rod (85) is fixedly connected between the two groups of upper tubular columns (85) on the left side and the right side, a double-rotation-direction screw rod (86) is rotatably arranged on the upper side of the first cross rod (84), movable blocks (87) are screwed on the double-rotation-direction screw rod (86), the movable blocks (87) are divided into two bilaterally symmetrical blocks, connecting rods (88) are hinged to the tops of the movable blocks (87), the top ends of the connecting rods (88) are hinged to the bottom surfaces of the second cross rods (85), the two groups of connecting rods (88) are symmetrically arranged, a lifting motor (12) is arranged on the right side of the top end, a fifth gear (89) is arranged at the right part of the double-rotation-direction screw rod (86), and the fifth gear (89) is meshed with a fourth gear (13);

adjusting roller (9) is including otic placode (91), otic placode (91) fixed mounting is on lower tubular column (81), the bottom bilateral symmetry of otic placode (91) is equipped with spring telescopic link (92), the bottom of spring telescopic link (92) is connected with gyro wheel (93), it has adjusting screw (94) to run through the spiro union on otic placode (91), the bottom butt gyro wheel (93) top surface of adjusting screw (94), the top rigid coupling of adjusting screw (94) has gyro wheel carousel (95).

2. The automatic logistics conveying line according to claim 1, wherein: carry roller (2) including roller body (21), the right part of roller body (21) is provided with positive spiral (22), the left part of roller body (21) is provided with reverse spiral (23), the middle part of positive spiral (22) and reverse spiral (23) is smooth barrel, when carrying roller (2) normal conveying, the two cooperation of positive spiral (22) and reverse spiral (23) can make the conveying goods on carrying roller (2) tend to the middle part and move.

3. The automatic logistics conveying line according to claim 1, wherein: the roller synchronous transmission mechanism (3) comprises a first guide chain roller (31), a chain (32), a chain wheel (33), a conveying motor (34), a second guide chain roller (35), a third guide chain roller (36) and a tensioning mechanism (37), wherein the chain wheel (33) is sleeved at the front end of a central shaft of the conveying roller (2), the first guide chain roller (31) is arranged on the front wall of the frame (1), the first guide chain roller (31) is close to the upper part of the chain wheel (33), the number of the second guide chain rollers (35) is four, the upper and lower parts of the four guide chain rollers are distributed at four corners of the front side of the frame (1), the conveying motor (34) is in driving connection with the second guide chain roller (35) at the upper left part, the number of the third guide chain rollers (36) is two, the third guide chain rollers (36) are distributed at the lower side of the middle part of the front side of the frame (1) in a staggered manner, and the tensioning mechanism (37) is arranged at the position, close to the third guide chain roller (36) at the lower, chain (32) are two be the zigzag connection on third direction chain roller (36), and the both ends that are the winding chain of zigzag (32) are walked around respectively and are connected with first direction chain roller (31) and sprocket (33) after second direction chain roller (35) of homonymy, chain (32) are connected with snakelike wraparound mode between first direction chain roller (31) and sprocket (33), the face of being connected of chain (32) and sprocket (33) is greater than the half of sprocket (33) arc surface.

4. The automatic logistics conveying line according to claim 3, wherein: straining device (37) is including lead screw groove (371), lead screw (372), through-hole (373), worm wheel (374), worm (375) and worm carousel (376), establish in frame (1) front side middle part downside lead screw groove (371), lead screw (372) level is transversely rotated and is installed in lead screw groove (371), the cover is equipped with the slider on lead screw (372), and the slider slides and connect butt lead screw groove (371), third direction chain roller (36) rigid coupling is on the slider on lead screw (372), through-hole (373) is established in the left side of lead screw groove (371), lead screw (372) left end is run through in lead screw groove (371) stretches into through-hole (373), lead screw (372) are located and have connect worm wheel (374) on the pole wall of through-hole (373) inboard, worm (375) vertical rotation is established in through-hole (373), and worm wheel (374) are connected with the meshing, the bottom end of the worm (375) penetrates through the bottom end of the frame (1) and is connected with a worm rotary table (376).

5. The automatic logistics conveying line according to claim 1, wherein: the sorting equipment (4) comprises a shell (41), round holes (42) are distributed in the top array of the shell (41), turning conveying pieces (43) are arranged in the round holes (41), the bottom ends of the central shafts of the turning conveying pieces (43) are rotatably connected with the bottom wall of the inner cavity of the shell (41), sliding rods (44) are transversely arranged in the middle of the inner cavity of the shell (41), the sliding rods (44) are divided into a plurality of pieces which are arranged in parallel, the cross section of each sliding rod (44) is noncircular, each sliding rod (44) is provided with a rack plate (45) in a sliding mode on the lower side, thin rods (48) are fixedly connected between the adjacent rack plates (45) in the front and the back, the rack surfaces of the rack plates (45) are meshed with the lower portion of the turning conveying pieces (43), a turning adjusting motor (46) is arranged on the right side of the bottom wall of the inner cavity of the shell (41, the first gear (47) engages the rack face of the foremost rack bar plate (45).

6. The automatic logistics conveying line according to claim 5, wherein: the turning conveying piece (43) comprises a supporting rotating shaft (431), a cylindrical barrel (432) is fixedly connected to the top end of the supporting rotating shaft (431), the top end of the cylindrical barrel (432) is open, a second gear (433) is arranged in the middle of the supporting rotating shaft (431), the second gear (433) is meshed with a rack face of a rack plate (45) to be connected with a conveying wheel (434) arranged in an inner hole of the cylindrical barrel (432), a steering driving motor (435) is arranged on the lower side of the conveying wheel (434), a third gear (436) is arranged at the output end of the steering driving motor (435), and the third gear (436) is meshed with a ring-shaped gear ring part of the movable conveying wheel (434).

7. The automatic logistics conveying line according to claim 6, wherein: the transmission wheel (434) is including cylinder wheel (4341), both ends symmetry is provided with protruding axle (4342) about cylinder wheel (4341), the middle part of cylinder wheel (4341) is equipped with annular groove (4343), annular ring gear (4344) are gone up to the annular groove face of annular groove (4343), third gear (436) is connected in the meshing of annular groove ring gear (4344), through rough processing on the wheel face of cylinder wheel (4341) with its transmission increase frictional force.

8. The automatic logistics conveying line according to claim 1, wherein: the connecting seat (7) comprises a shell seat (71), the shell seat (71) is of a square sleeve structure with an opening at the bottom, a notch (72) is formed in the lower portion of the right side face of the shell seat (71), long sliding grooves are symmetrically formed in the front side and the rear side of the shell seat (71), an L-shaped plate (73) is arranged on the left side of the shell seat (71), a pull rod (74) penetrates through the vertical plate of the L-shaped plate (73) in a transverse moving mode, a convex disc (75) is arranged at the right portion of the pull rod (74), the convex disc (75) is located on the inner side of the L-shaped plate (73), a spring (76) is connected to the pull rod (74) in a winding mode, the spring (76) is located between the convex disc (75) and the vertical plate of the L-shaped plate (73), a clamping groove is formed in the upper portion of the lifting support (8) corresponding to the pull rod (74), and the right end of the pull rod (74), the lifting bracket (8) in the use state is positioned.

9. The automatic logistics conveying line according to claim 1, wherein: the controller (5) is electrically connected with the roller synchronous transmission mechanism (3), the sorting equipment (4), the identification module (6) and the lifting motor (12) respectively.

10. The use method of the automatic logistics conveying line is characterized by comprising the following steps:

s1, the conveyed goods are marked and classified and then are placed on conveying equipment at intervals;

s2, the conveying roller (2) operates to drive the goods to move to one side of the sorting equipment (4), and the goods are identified and classified by the identification module (6) before entering the sorting equipment (4);

s3, the identification module (6) feeds the classification information back to the controller (5), the controller (5) selects a sorting conveying direction matched with the current goods according to a preset sorting rule, and sends an instruction to control a driving motor of the sorting equipment (4) to operate according to a specified rule;

s4, the goods enter the sorting area, and the sorting equipment (5) drives the goods to move to the set storage area or the set carrying direction.

Technical Field

The invention relates to the technical field of logistics conveying, in particular to an automatic logistics roller type conveying line.

Background

The roller conveyor is suitable for conveying various boxes, bags, trays and other articles, and bulk materials, small articles or irregular articles need to be conveyed on the trays or in the turnover boxes. In the logistics industry today, roller conveyors are used in a relatively wide range.

Chinese patent 203497598U discloses a synchronous conveying device for conveying rollers, which comprises a power shaft and conveying rollers, wherein the conveying rollers comprise an active conveying roller and a subsequent passive conveying roller sleeved on the power shaft, the active conveying roller and the subsequent conveying roller are respectively provided with a synchronous gear, and each synchronous gear forms an integral mechanism through a synchronous belt. The utility model compresses a plurality of rollers with synchronous gears through the synchronous belts to run, drives the conveying rollers through the synchronous belts, but the conveying rollers are not driven by the compression action of a single synchronous belt, so that the conveying rollers are easy to be stressed unevenly and rotate asynchronously; another patent CN201520479328.6 relates to a synchronous belt roller conveyor for automatic conveying, which includes a frame, two roller brackets fixed on the frame, and a conveying mechanism disposed between the two roller brackets. Compared with the prior art, the problems of uneven stress and asynchronous rotation of each conveying roller in the prior art are solved by using a plurality of transmission belts, but the failure rate of the conveying line is improved by using excessive transmission belts;

in addition, in the use process of the existing roller conveyor, materials are easy to move to the outer side of the conveyor, abrasion can occur between the materials and the conveyor, the attractiveness of the materials is affected, and meanwhile, the overall conveying speed of the materials is affected. The utility model discloses in, the welding of cylinder carriage monomer has the roller frame support frame in the both sides of bearing roller support, and the welding has the roller frame on bearing roller support and roller frame support frame, then have first cylinder support frame and the second cylinder support frame of connecting first cylinder and second cylinder in the welding of the symmetry from inside to outside on the upper portion of roller frame, and the both sides rotation that is close to the outer end at first cylinder is connected with the fender roller, the material is in transportation process like this, can avoid material and conveyer to take place wearing and tearing under first cylinder and fender roller effect, guarantee conveyer transportation speed. However, the device has the disadvantages of complex structure, high design cost, unreasonable overall structure size and no practicability.

The current transfer apparatus does not generally possess automatic sorting's function in addition, and among the logistics transportation process, because the type of goods, size or the difference of transportation destination, it need carry out classification planning to the goods to make things convenient for subsequent operation, prior art relies on the manual work to sort, and the operation is wasted time and energy, and degree of automation is low.

Based on the problems, the invention designs an automatic logistics conveying line to solve the problems.

Disclosure of Invention

The present invention is directed to an automatic logistics conveying line, so as to solve the above problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: an automatic logistics conveying line comprises a frame, the cross section of the frame is of a U-shaped structure, a conveying roller is rotationally arranged in the frame, the conveying rollers are arranged at equal intervals, the front end of a central shaft of each conveying roller is connected with a roller synchronous transmission mechanism, the right side of the frame is provided with sorting equipment, the right side of the rear side plate of the frame is respectively provided with a controller and an identification module, the bottom end of the frame is symmetrically provided with connecting seats at left and right, the connecting seats at the same side are divided into two groups which are opposite front and back, the connecting seat is provided with a lifting bracket, the lower pipe wall of the lifting bracket is provided with an adjusting roller, first magnets are symmetrically arranged at the left and right sides of the bottom end of the frame, second magnets are arranged on the lifting support, and the first magnets and the second magnets attract each other when in contact;

the lifting support comprises a telescopic frame which is divided into a left group and a right group, the telescopic frame consists of lower tubular columns, upper tubular columns and insertion columns, a first cross rod is fixedly connected between the two groups of lower tubular columns on the left side and the right side, a second cross rod is fixedly connected between the two groups of upper tubular columns on the left side and the right side, a double-rotation-direction screw rod is rotatably arranged on the upper side of the first cross rod, movable blocks are screwed on the double-rotation-direction screw rod and are divided into two bilaterally symmetrical movable blocks, connecting rods are hinged to the tops of the movable blocks, the top ends of the connecting rods are hinged to the bottom surfaces of the second cross rods, the two groups of connecting rods are symmetrically arranged, a lifting motor is arranged on the right side of the top end of the first cross rod, a fourth gear is arranged at the output end of the lifting;

the adjusting roller comprises an ear plate, the ear plate is fixedly mounted on the lower pipe column, spring telescopic rods are symmetrically arranged at the left and right sides of the bottom end of the ear plate, the bottom end of each spring telescopic rod is connected with a roller, the ear plate is connected with an adjusting screw rod through a threaded connection, the bottom end of each adjusting screw rod is abutted to the top surface of the corresponding roller, and the top end of each adjusting screw rod is fixedly connected with a roller turntable.

Preferably, the conveying roller comprises a roller body, a positive spiral is arranged at the right part of the roller body, a reverse spiral is arranged at the left part of the roller body, the middle parts of the positive spiral and the reverse spiral are smooth cylinders, and when the conveying roller normally conveys, the conveying goods on the conveying roller tend to move towards the middle part due to the cooperation of the positive spiral and the reverse spiral.

Preferably, the roller synchronous transmission mechanism comprises a first guide chain roller, a chain wheel, a conveying motor, a second guide chain roller, a third guide chain roller and a tensioning mechanism, the chain wheel is sleeved at the front end of a central shaft of the conveying roller, the first guide chain roller is arranged on the front wall of the frame, the first guide chain roller is close to the upper part of the chain wheel, the second guide chain rollers are four in number and distributed at the four corners of the front side of the frame in a vertical and pairwise manner, the conveying motor is connected with the second guide chain roller on the upper left side in a driving manner, the third guide chain rollers are two in number, the two third guide chain rollers are distributed on the lower side of the middle part of the front side of the frame in a staggered manner, the tensioning mechanism is arranged at the position, close to the lower side of the third guide chain roller, the chain is connected in a zigzag manner on the two third guide chain rollers, and the two ends of the chain wound in a zigzag manner are respectively connected with the first guide chain roller and the chain wheel after bypassing the, the chain is connected between the first guide chain roller and the chain wheel in a snake-shaped winding mode, and the connecting surface of the chain and the chain wheel is larger than half of the circular arc surface of the chain wheel.

Preferably, straining device is including lead screw groove, lead screw, opening, worm wheel, worm and worm carousel, the lead screw groove is established at frame front side middle part downside, the horizontal rotation of lead screw is installed at the lead screw inslot, the cover is equipped with the slider on the lead screw, and the slider slides the butt lead screw groove, third direction chain roller rigid coupling is on the slider on the lead screw, the left side in lead screw groove is established to the opening, the lead screw left end runs through the lead screw groove and stretches into in the opening, the lead screw is located fixed the cover on the inboard pole wall of opening and has been connected the worm wheel, the vertical rotation of worm is established in the opening, and the worm wheel is connected with the worm meshing, the worm carousel is connected to the frame bottom is run through to the worm bottom.

Preferably, letter sorting equipment is including the casing, the top array distribution of casing has the round hole, be equipped with the diversion conveying piece in the round hole, the center pin bottom of diversion conveying piece rotates with the inner chamber diapire of casing to be connected, casing inner chamber middle part transversely is provided with the slide bar, the slide bar divide into parallel arrangement's many, the non-circular of cross section of slide bar, every the downside of slide bar all slides and is provided with the rack board, and the rigid coupling has the pin between the adjacent rack board in front and back, the rack face of rack board is connected with the lower part meshing of diversion conveying piece, the inner chamber diapire right side of casing is equipped with and turns to the accommodate motor, the output that turns to the accommodate motor is provided with first gear, the rack face of the most preceding rack board of first gear engagement.

Preferably, the turning conveying member comprises a supporting rotating shaft, a cylindrical barrel is fixedly connected to the top end of the supporting rotating shaft, the top end of the cylindrical barrel is open, a second gear is arranged in the middle of the supporting rotating shaft, the second gear is meshed with a rack face of a rack plate and connected with a conveying wheel arranged in an inner hole of the cylindrical barrel, a steering driving motor is arranged on the lower side of the conveying wheel, a third gear is arranged at the output end of the steering driving motor, and the third gear is meshed with an annular gear portion of the movable conveying wheel.

Preferably, the transfer gear is including the cylinder wheel, both ends symmetry is provided with the protruding axle about the cylinder wheel, the middle part of cylinder wheel is equipped with the annular, annular ring gear on the annular groove face of annular, the third gear is connected in the meshing of annular ring gear, through rough processing on the wheel face of cylinder wheel with its transmission increase frictional force.

Preferably, the connecting seat is including the shell seat, the shell seat is bottom open-ended square sleeve structure, open jaggedly in the right flank lower part of shell seat, rectangular spout has been seted up to the side symmetry around the shell seat, the left side of shell seat is provided with the L template, horizontal activity runs through on the L template riser and is provided with the pull rod, the right part of pull rod is equipped with the flange, the flange is located L template inboard, the wire-wound has the spring on the pull rod, the spring is located the part between flange and the L template riser, the upper portion of lifting support corresponds the pull rod and is equipped with the draw-in groove, the right-hand member of pull rod runs through in the draw-in groove that the shell seat inserted on the pull rod, fixes a position lifting support under the user state.

Preferably, the controller is respectively and electrically connected with the roller synchronous transmission mechanism, the sorting equipment, the identification module and the lifting motor.

The use method of the automatic logistics conveying line comprises the following steps:

s1, the conveyed goods are marked and classified and then are placed on conveying equipment at intervals;

s2, the conveying roller operates to drive the goods to move to one side of the sorting equipment, and the goods are identified and classified by the identification module before entering the sorting equipment;

s3, the recognition module feeds back the classification information to the controller, the controller selects the sorting and conveying direction matched with the current goods according to the preset sorting rule, and sends an instruction to control a driving motor of the sorting equipment to operate according to the specified rule;

s4, the goods enter the sorting area, and the sorting equipment drives the goods to move to a set storage area or a set carrying direction.

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

1. according to the invention, the forward and reverse screws are arranged at the two ends of the conveying roller, so that when the goods are conveyed on the roller and incline, the goods move to the middle part of the conveying roller through the transmission force of the screws, and the goods are prevented from colliding and rubbing with the side plates of the conveying line;

2. according to the invention, through the arrangement of the sorting equipment, the identification module and other structures, the conveyed goods can be classified and conveyed to a set area, so that the goods can be conveniently processed subsequently;

3. the roller synchronous transmission mechanism is formed by winding a chain between a plurality of guide rollers and a roller central shaft in a snake shape, so that the effect of synchronously conveying a plurality of rollers through the chain is realized, and compared with the traditional technology, the design mode not only reduces the failure rate, but also ensures that the roller is uniformly stressed and has high movement synchronism;

4. the tensioning mechanism can adjust the tensioning degree of the chain so as to ensure the reliability of synchronous transmission of the roller;

5. the lifting support and the connecting seat can be folded, retracted and stored, so that the conveying equipment can be conveniently carried and stored;

6. the lifting support can adjust the height of the conveying line so as to be convenient for adapting to different working environments, and can be butted with external facilities with different heights, so that the applicability of the device is improved;

7. the device can flexibly move or be stably arranged through the designed adjusting roller.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings 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 that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a schematic view of the structure of the conveying roller of the present invention;

FIG. 4 is a schematic view of the sorting apparatus of the present invention;

FIG. 5 is a schematic view of a rack plate connection of the present invention;

FIG. 6 is a schematic view of a direction-changing conveyor according to the present invention;

FIG. 7 is a three-dimensional view of a direction-changing conveyor of the present invention;

FIG. 8 is a schematic view of a transfer wheel according to the present invention;

FIG. 9 is a schematic view of the lifting bracket of the present invention;

FIG. 10 is a schematic view of an adjusting roller according to the present invention;

FIG. 11 is an enlarged view of the invention at A;

FIG. 12 is an enlarged view of the invention at B;

FIG. 13 is a block diagram of the electrical component connections of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1-frame, 2-conveying roller, 3-roller synchronous transmission mechanism, 4-sorting equipment, 5-controller, 6-identification module, 7-connecting seat, 8-lifting support, 9-adjusting roller, 10-first magnet, 11-second magnet, 12-lifting motor, 13-fourth gear, 21-roller body, 22-positive spiral, 23-negative spiral, 31-first guide chain roller, 32-chain, 33-chain wheel, 34-conveying motor, 35-second guide chain roller, 36-third guide chain roller, 37-tensioning mechanism, 371-screw rod groove, 372-screw rod, 373-through hole, 374-worm wheel, 375-worm, 376-worm rotary disk, 41-shell, 42-round hole, 43-direction changing transmission member, 44-sliding rod, 45-rack plate, 46-steering adjusting motor, 47-first gear, 48-thin rod, 431-supporting rotating shaft, 432-cylindrical barrel, 433-second gear, 434-transmission wheel, 435-steering driving motor, 436-third gear, 4341-cylindrical wheel, 4342-convex shaft, 4343-ring groove, 4344-ring-shaped gear ring, 71-shell seat, 72-notch, 73-L-shaped plate, 74-pull rod, 75-convex disc, 76-spring, 81-lower column, 82-upper column, 83-plug column, 84-first cross rod, 85-upper column, 86-double-rotating-direction screw rod, 87-movable block, 88-connecting rod, 89-fifth gear, 91-ear plate, 92-spring telescopic rod, 93-roller, 94-adjusting screw rod, 95-roller turntable.

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.