CN110406909A - A new linear sorter - Google Patents

Abstract

The invention discloses a novel linear sorting machine, which includes a sorting trolley, a support frame, a double-row sprocket chain mechanism and a deceleration motor. The sorting trolleys are connected in series, and each of the sorting trolleys is fixedly connected to two ends. Two chain plates, load wheels and guide wheels are installed on the two chain plates, the two chains of the double-sprocket chain mechanism are hinged on the two chain plates, and the two rows of sprockets of the double-row sprocket chain mechanism are rotatably connected to the support frame At both ends, the output shaft of the deceleration motor is fixedly connected to the rotating shaft of one of the two rows of sprockets, the deceleration motor is fixedly connected to the support frame, and the upper and lower sides of the support frame are provided with upper and lower guide rails that support the load-bearing wheels and guide wheels . The present invention arranges the sorting trolley in a vertical linear structure, and the driving force of the straight line is that the reduction motor drives the sprocket through the transmission shaft, the sprocket drives the chain, the chain connects the chain plate, and the sorting trolley is fixed on the chain plate to realize the longitudinal and circular direction of operation. Operation, greatly reducing the occupied space, greatly improving the space utilization.

Description

A new linear sorter

technical field

The invention relates to a novel linear sorting machine, which belongs to the technical field of express sorting equipment.

Background technique

The traditional cross-belt sorter has a ring structure. Because the width of the trolley is relatively wide and the outer radius of the turn is large, a large part of the space in the middle is wasted. Due to the limited sorting space, the ring sorter cannot be used in a long and narrow space.

Contents of the invention

The technical problem to be solved by the present invention is to provide a novel linear sorting machine to solve the above-mentioned problems in the prior art.

The technical solution adopted by the present invention is: a new linear sorting machine, including a sorting trolley, a support frame, a double-row sprocket chain mechanism and a deceleration motor. The sorting trolleys are connected in series, and each sorting trolley There are two chain plates fixedly connected on the two chain plates, and the load wheel and the guide wheel are installed on the two chain plates. The two chains of the double-sprocket chain mechanism are hinged on the two chain plates. At both ends of the support frame, the output shaft of the deceleration motor is fixedly connected to the rotating shaft of one of the two rows of sprockets, the deceleration motor is fixedly connected to the support frame, and the upper and lower sides of the support frame are provided with support bearing wheels and guide wheels upper and lower guide rails.

Preferably, one end of the upper chain plates of the two adjacent sorting trolleys connected in series is rotatably connected to a load wheel, and the other end is provided with a horizontal U-shaped gap, and the U-shaped gap can be movably inserted into the adjacent sorting trolley. on the bearing wheel shaft.

Preferably, the above-mentioned sorting trolley includes an electric drum, an unpowered drum, a belt and a frame, the electric drum and the unpowered drum are rotatably connected to both ends of the frame, the belt is sleeved on the electric drum and the unpowered drum, and the frame The two ends are fixedly connected to the chain plate, and guide wheels are installed on the outer side of the middle part of the chain plate.

Preferably, the above frame includes a front side plate, a rear side plate, a left side plate and a right side plate, the lower sides of the two ends of the front side plate and the rear side plate are fixedly connected by the left side plate and the right side plate respectively, the front side plate and the U-shaped bar-shaped openings and bar-shaped holes are respectively arranged on the upper sides of the two ends of the rear side plate.

Preferably, the above-mentioned left side panel and right side panel are both fixedly connected to the front side panel and the rear side panel through right-angle pieces.

Preferably, a bearing plate is fixedly connected between the front side plate and the rear side plate close to the upper side, and the bearing plate is located below the belt and keeps in contact with the belt.

Preferably, a trolley line connector is fixedly connected to the lower side of one end of the frame.

Preferably, a chain tensioning mechanism is installed on the tail-end sprockets of the above-mentioned double-row sprocket chain mechanism, and the chain tensioning mechanism includes a tensioning plate, a tensioning guide rail and a tensioning screw, and the tensioning plate is fixedly connected with the sprocket shaft. Square bearing seat, the upper and lower sides of the tensioning plate are placed in the horizontal tensioning guide rail, and the tensioning guide rail is fixedly connected to the inner side of the outer plate of the support frame. The side is fixedly connected with a tensioning seat, the tensioning seat protrudes from the horizontal strip opening on the outer plate, one end of the tensioning screw is rotatably connected to the tensioning seat, the tensioning screw is screwed on the tensioning fixed seat, and the tensioning is fixed The seat is fixedly connected to the outer plate, and the auxiliary guide rail is set near the guide rail of the sorter on the tension plate.

Preferably, horizontal bolt-fixing strip-shaped through-holes are provided on the above-mentioned outer plate, and the outer plate and the tension plate are fixedly connected after bolts pass through the bolt-fixing strip-shaped through-holes.

Preferably, the support frame includes a support frame at both ends and a middle support frame, the support frames at both ends are detachably fixedly connected to both ends of the middle support frame, the middle support frame includes a pair of upper guide rails, a pair of lower guide rails and columns, a pair of The upper guide rails are fixedly connected to the upper ends of the four columns by welding, and a pair of lower guide rails are fixedly connected to the four columns and close to the lower ends of the columns by welding. A pair of upper guide rails are installed relative to each other. Each upper guide rail includes a lower guide rail and an upper guide rail. The lower guide rail adopts a three-time vertical bending step structure of the plate. A guide rail groove is formed between the end surface and the lower guide rail bar; a pair of lower guide rails adopts a relative installation method, and each upper guide rail includes a lower guide rail bar and an angle steel bar with a groove structure, and the angle steel bar is fixedly connected to the groove of the lower guide rail bar and along the The direction of the length of the lower rail.

Beneficial effects of the present invention: compared with prior art, effect of the present invention is as follows:

(1) Based on the original trolley structure, the sorting trolley is arranged in a vertical linear structure. The driving force of the straight line is that the gear motor drives the sprocket through the transmission shaft, the sprocket drives the chain, and the chain connects the chain plate. The sorting trolley is fixed on the The chain plate realizes running longitudinally and circumferentially, which greatly reduces the occupied space and greatly improves the space utilization rate;

(2) For tandem sorting trolleys, the rear loading wheel of the previous one is used as the front loading wheel of the next sorting trolley (two sorting trolleys share two adjacent loading wheels), which can reduce the use of loading wheels, It is equivalent to installing two wheels for each trolley, using the load-bearing wheels of adjacent sorting trolleys to form four, ensuring the running and load-bearing stability of the sorting trolley, reducing the use and installation of load-bearing wheels, reducing equipment costs, and improving installation efficiency , the structure is simplified;

(3) The two ends of the frame of the sorting trolley are directly fixed on the chain plate, and then connected to the load wheel through the pin shaft, so that the structure is simple, and the parts are small, the safety is high, and the overall height is compressed;

(4) The frame structure is simple, easy to install, and the frame has good stability. The U-shaped bar opening 113 and the bar-shaped hole can facilitate the installation and position adjustment of the electric drum and the non-powered drum;

(5) Both sides of the right-angle piece are fixed by screw connection, detachable structure, convenient loading and unloading, low maintenance cost, stable and reliable connection;

(6) The loading plate is set up, which can improve the belt carrying capacity and the stability of the frame, and the contact wire connector is convenient for the power supply part of the electric drum to supply electric energy;

(7) Rotate the tensioning screw to push the tensioning plate to move in the tensioning direction, which can quickly realize the tensioning of the chain, and the adjustment is convenient and quick. It adopts the upper and lower side tensioning rails, which has good tensioning guidance and high adjustment accuracy. The tensioning plate It moves with the auxiliary guide rail at the same time. Before turning, half of the loading wheels of the sorting trolley are on the sorting guide rail, and the other half is on the auxiliary guide rail, ensuring that the trolley is loaded everywhere at the tensioned position, preventing the trolley from shaking and increasing the stability of the equipment;

(8) The detachable structure of the support frame is convenient for installation and maintenance. The upper and lower guide rails of the middle frame structure adopt the overall structure and are welded (where to weld, the joint is still with the column) to ensure the strength and stability of the structure. The upper and lower guide rails are welded on the On the same group of columns, the notch on the column ensures the accuracy of the position of the guide rail. When installing, just align the upper guide rail, and the lower guide rail will automatically align. It is easy to install, and the position of the column is supported at the bottom, so the strength is better (how to achieve better strength) , The guide rail integrated structure of the frame, the liner is easy to manufacture and install, and the flatness of the installation butt joint is better.

Description of drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the sorter;

Figure 2 is a schematic diagram of the three-dimensional structure of the sorting trolley in series;

Figure 3 is a schematic diagram of the three-dimensional structure of the sorting trolley;

Fig. 4 is a schematic diagram of rack connection structure;

Fig. 5 is a schematic view of the left view structure;

Fig. 6 is a schematic diagram of the cross-sectional structure of A-A in Fig. 5;

Fig. 7 is a schematic diagram of the B-B sectional structure in Fig. 6 .

Fig. 8 is a three-dimensional schematic diagram of the installation of the tensioning mechanism;

Figure 9 is a schematic diagram of the installation three-dimensional structure of the tensioning mechanism (remove the outer plate and a sprocket);

Fig. 10 is a schematic diagram of the tensioning mechanism installation side view structure;

Fig. 11 is a schematic diagram of the top view of the installation of the tensioning mechanism;

Fig. 12 is a schematic diagram of the cross-sectional structure of A-A in Fig. 11;

Fig. 13 is a schematic diagram of the cross-sectional structure of B-B in Fig. 12;

Figure 14 is a schematic diagram of the three-dimensional structure of the frame (a side-view liner is removed);

Figure 15 is a schematic side view of the frame structure;

Fig. 16 is a schematic diagram of A-A sectional fracture in Fig. 15;

Fig. 17 is a schematic diagram of a top view fracture of Fig. 16;

Figure 18 is a schematic diagram of the frame structure of the existing sorter (A is the upper guide rail, B is the supporting leg, and C is the lower guide rail).

Detailed ways

The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: As shown in Figure 1-Figure 17, a new type of linear sorter, a new type of linear sorter, including a sorting trolley 1, a support frame 2, a double-row sprocket chain mechanism 3 and a deceleration The motor 4 and the sorting trolley 1 are connected in series. Two chain plates 5 are fixedly connected to both ends of each sorting trolley 1. The two chain plates 5 are equipped with a load wheel 6 and a guide wheel 7. The double sprocket chain mechanism 3 The two chains are hinged on the two chain plates 5, and the two rows of sprockets 8 of the double-row sprocket chain mechanism 3 are rotatably connected to the two ends of the support frame 2, and the output shaft of the reduction motor 4 is connected to the two rows of sprockets 8. The rotating shaft of a row of sprockets is fixedly connected, and the reduction motor 4 is fixedly connected on the support frame 2, and the upper and lower sides of the support frame 2 are provided with upper and lower guide rails supporting the load bearing wheel 6 and the guide wheel 7.

Preferably, one end of the upper chain plates 5 of the two adjacent sorting trolleys connected in series is rotatably connected to the load wheel 6, and the other end is provided with a horizontal U-shaped notch 9, which can be movably inserted into the adjacent On the 6 rotating shafts of the loading wheels of the sorting trolley, the tandem sorting trolley uses the rear loading wheel of the previous one as the front loading wheel of the latter sorting trolley (two sorting trolleys share two adjacent loading wheels), It can reduce the use of load-bearing wheels, which is equivalent to installing two wheels on each trolley. Four load-bearing wheels of adjacent sorting trolleys are used to ensure the walking and load-bearing stability of the sorting trolley, reducing the use and installation of load-bearing wheels. Reduce equipment costs, improve installation efficiency, and simplify the structure. The two ends of the frame are directly fixed on the chain plate, and then connected to the load wheel through the pin shaft. This structure is simple, and the parts are small, high in safety, and the overall height is compressed.

Preferably, each of the above-mentioned sorting trolleys includes an electric drum 101, an unpowered drum 102, a belt 103 and a frame 104, the electric drum 101 and the unpowered drum 102 are rotatably connected to both ends of the frame 104, and the belt 103 is sleeved on On the electric drum 101 and the non-powered drum 102, the two ends of the frame 104 are fixedly connected to the chain plate 5, and the guide wheel 7 is installed on the outer surface of the middle part of the chain plate 5, and the two ends of the frame of the sorting trolley are directly fixed on the chain plate, and then pass The pin shaft is connected with the bearing wheel, so the structure is simple, and the parts are small, the safety is high, and the overall height is compressed.

Preferably, the above-mentioned frame 104 includes a front side plate 108, a rear side plate 109, a left side plate 110 and a right side plate 111, and the lower sides of the front side plate 108 and the rear side plate 109 pass through the left side plate 110 and the right side respectively. The plates 111 are fixedly connected, and the upper sides of the front side plate 108 and the rear side plate 109 are respectively provided with a U-shaped bar-shaped opening 113 and a bar-shaped hole. The structure is simple, the installation is convenient, and the frame stability is good. And the bar-shaped holes can facilitate the installation and position adjustment of the electric drum and the non-powered drum.

Preferably, the above-mentioned left side panel 110 and right side panel 111 are fixedly connected to the front side panel 108 and the rear side panel 109 through right-angle pieces 112, and the two sides of the right-angle pieces are fixed by screw connection, detachable structure, convenient loading and unloading, and low maintenance cost Low, the connection is stable and reliable.

Preferably, a bearing plate 115 is fixedly connected between the front side plate 108 and the rear side plate 109 near the upper side, and the bearing plate 115 is located below the belt 103 and keeps in contact with the belt 103, which can improve the belt carrying capacity and frame stability.

Preferably, a trolley line connector 114 is fixedly connected to the lower side of one end of the frame 104, so as to facilitate the power supply components of the electric drum to supply electric energy.

Preferably, a chain tensioning mechanism is installed on the tail end row sprockets of the above-mentioned double-row sprocket chain mechanism 3, and the chain tensioning mechanism includes a tensioning plate 301, a tensioning guide rail 302 and a tensioning screw 303, and the tensioning plate 301 is fixed The square bearing seat 305 connected with the sprocket shaft 304, the upper and lower sides of the tension plate 301 are placed in the horizontal tension guide rail 302, the tension guide rail 302 is fixedly connected to the inner side of the outer plate 305 of the support frame, and the outer plate 305 is provided with a shelf The horizontal strip hole 306 of the bearing seat 305, the tension seat 307 is fixedly connected to the outer surface of the tension plate 301, the tension seat 307 protrudes from the horizontal strip opening 309 on the outer plate 305, and one end of the tension screw 303 is rotatably connected To the tension seat 307, the tension screw 303 is screwed to the tension fixed seat 308, and the tension fixed seat 308 is fixedly connected to the outer plate 305. The tension plate 301 is provided with an auxiliary guide rail 311 near the guide rail of the sorter, and the outer plate 305 is fixedly connected to the frame columns 314 at both ends, and the upper ends of the frame columns 314 at both ends are equipped with two upper layer guide rails 313, and two ends of the lower layer guide rails are installed near the lower ends, and the tensioning screw is rotated to push the tension plate to move in the tensioning direction. Quickly realize the tensioning of the chain, convenient and fast adjustment, adopt the upper and lower side tensioning rails, the tensioning guide is good, the adjustment accuracy is high, the tensioning plate and the auxiliary guide rail move at the same time, and half of the loading wheels of the sorting trolley are sorting before turning The guide rail, the other half is on the auxiliary guide rail, which ensures that the trolley is loaded everywhere at the tensioned position, prevents the trolley from shaking, and increases the stability of the equipment.

Preferably, the above-mentioned outer plate 305 is provided with a horizontal bolt-fixed strip-shaped through hole 310, and the outer plate and the tension plate 301 are fixedly connected after the bolt is passed through the bolt-fixed strip-shaped through-hole 310. The connection is convenient and fast, and the connection is stable and reliable. .

Preferably, the support frame 2 includes a support frame at both ends and a middle support frame, the support frames at both ends are detachably fixedly connected to both ends of the middle support frame, the detachable structure is convenient for installation and maintenance, and the maintenance cost is low, and the middle support frame Comprising a pair of upper guide rails 201, a pair of lower guide rails 202 and upright posts 203, a pair of upper guide rails 201 are fixedly connected to the upper ends of four upright posts 203 by welding, a pair of lower guide rails 202 are fixedly connected to four upright posts 203 by welding and Close to the lower end of the column 203, a pair of upper guide rails 201 and a pair of lower guide rails 202 are fixedly connected by bolts through two rows of beams 204, which can realize the adjustment of different widths between the front and rear guide rails, and the adjustment is convenient and quick. The upper and lower guide rails adopt the overall structure Welding to ensure the strength and stability of the structure. The upper and lower guide rails are welded on the same set of columns. The gap on the column ensures the accuracy of the position of the guide rails. When installing, as long as the upper guide rails are aligned, the lower guide rails will automatically align. Supported at the bottom, the stability is better, the guide rail integrated structure of the frame, the liner is easy to manufacture and install, and the flatness of the installation butt joint is better, which effectively solves the problem of "existing upper and lower separated guide rail support frame structure as shown in Figure 18". The butt joints must be docked separately, and the assembly workload is large. The lower guide rail is assembled from the bottom up, the frame itself is heavy, the installation is difficult, and the guide rail docking requirements are relatively high. There is a technical problem that the load wheel of the trolley is damaged more”; a pair of upper guide rails 201 are installed oppositely, and each upper guide rail includes a lower guide rail bar 205 and an upper side guide rail bar 206, and the lower guide rail bar 205 is vertically bent three times by a plate Step structure, the upper guide rail bar 206 is a cavity structure with trapezoidal section, the guide rail groove is formed between the lower end surface and the lower side guide rail bar 205, and the upper and lower assembled guide rails have simple structure, convenient adjustment, low cost, high support stability and low manufacturing cost A pair of lower guide rails 202 adopts a relative installation mode, and each upper guide rail includes a lower guide rail bar 207 and an angle steel bar 208 of a groove structure, and the angle steel bar 208 is fixedly connected to the groove portion of the lower guide rail bar 207 and along the length of the lower guide rail bar 207 Direction, assembled guide rail, simple structure, convenient adjustment, low cost, high support stability, and low manufacturing cost.

Preferably, the lower side of the above-mentioned lower guide rail bar 207 is provided with a bar-shaped groove 209 with a structure of the lower guide rail bar 207, and the bottom sealing plate 210 spliced is installed between the two shaped grooves 209, which can prevent dust and rodents. effect.

Preferably, the above-mentioned upper and lower rows of crossbeams 204 adopt multiple pairs, and each crossbeam 204 is a channel steel structure with openings on the side, with both ends closed, and strip-shaped through holes 211 are provided on the upper and lower sides, so as not to reduce the rigidity and stability of the connection. , which can reduce the weight of the equipment and facilitate the bundling of cables.

Preferably, each column 203 is an angle steel structure, and the upper and lower sides are provided with gaps for fitting a pair of upper guide rails 201 and a pair of lower guide rails 202, and the back is fixedly connected with connecting strips 212, and the connecting strips 212 are fixedly connected with side linings Plate 213, the side wall lining plate 213 is provided with an inspection port, the inspection port is installed with an inspection plate 215, the column structure is simple, after being fixedly connected with the guide rail, the support stability and rigidity of the column are improved, the weight is reduced, and the connecting strip is provided for easy installation The side liner is also convenient to improve the support rigidity of the column.

Preferably, auxiliary uprights 214 are arranged between the two uprights 203 on each side, so as to improve the support stability of the guide rail and the rigidity of the frame.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a kind of Novel direct wire type sorter, it is characterised in that: including sorting trolley (1), braced frame (2), double strand chain endless chain Mechanism (3) and decelerating motor (4), sorting trolley (1) use multiple concatenations, and each sorting trolley (1) both ends are fixedly connected with Two carrier bars (5) are equipped with bearing wheels (6) and directive wheel (7) on two carrier bars (5), and two chains of double chain wheel link chain mechanism (3) are hinged On two carrier bars (5), two rows of sprocket wheels (8) of duplex chain wheel link chain mechanism (3) are rotatably connected to the two of braced frame (2) End, the output shaft of decelerating motor (4) are fixedly connected with the shaft of a wherein row chain wheel for two rows of sprocket wheels (8), and decelerating motor (4) is solid Surely be connected on braced frame (2), braced frame (2) interior upper and lower sides be provided with support bearing wheel (6) and directive wheel (7) up and down Layer guide rail.

2. a kind of Novel direct wire type sorter according to claim 1, it is characterised in that: the two neighboring sorting of concatenation is small Vehicle upper link plate (5) one end is rotatably connected bearing wheels (6), the horizontal U-shaped notch (9) of other end setting, U-shaped notch (9) It movable can be plugged into bearing wheels (6) shaft of adjacent sorting trolley.

3. a kind of Novel direct wire type sorter according to claim 1, it is characterised in that: each sorting trolley (1) includes Motorized roller (101), no-power drum (102), belt (103) and rack (104), motorized roller (101) and no-power drum (102) rack (104) both ends are rotatably connected to, belt (103) is socketed in motorized roller (101) and no-power drum (101) on, rack (104) both ends are fixedly connected carrier bar (5), and carrier bar (5) outside middle portion is equipped with directive wheel (7).

4. a kind of sorting trolley cascaded structure according to claim 3, it is characterised in that: rack (104) includes front side board (108), divide on the downside of back side panel (109), left plate (110) and right side plate (111), front side board (108) and back side panel (109) both ends Not Tong Guo left plate (110) be fixedly connected with right side plate (111), set respectively on the upside of front side board (108) and back side panel (109) both ends It is equipped with U-shaped strip shape gob (113) and strip-shaped hole.

5. a kind of sorting trolley cascaded structure according to claim 4, it is characterised in that: left plate (10) and right side plate (111) it is fixedly connected on front side board (108) and back side panel (109) by angled piece (112).

6. a kind of sorting trolley cascaded structure according to claim 3, it is characterised in that: front side board (108) and back side panel (109) it is fixedly connected with loading plate (115) between close to upper side, loading plate (115) is located at below belt (103) and and belt (103) it is kept in contact.

7. a kind of sorting trolley cascaded structure according to claim 3, it is characterised in that: solid on the downside of rack (104) one end Surely wiping wire connections (114) are connected with.

8. a kind of Novel direct wire type sorter according to claim 1, it is characterised in that: duplex chain wheel link chain mechanism (3) Tail end row chain wheel chain tensioning mechanism is installed, chain tensioning mechanism includes tensioning plate (301), tensioning guide rail (302) and opens Tight screw (303), is fixedly connected with the square bearing seat (305) of sprocket shaft (304) on tensioning plate (301), on tensioning plate (301) Downside, which obtains, to be placed in horizontal tensioning guide rail (302), and tensioning guide rail (302) is fixedly connected on the outer panel of braced frame (305) on the inside of, the horizontal bar hole (306) for shelving bearing block (305), tensioning plate (301) outside are provided on outer panel (305) Face is fixedly connected with backstand (307), and backstand (307) horizontal strip shape gob (309) from outer panel (305) is stretched out, and is tensioned spiral shell Nail (303) one end is rotatably connected to backstand (307), and tensioning screw (303) spiral is connected to tensioning fixing seat (308) On, tensioning fixing seat (308) is fixedly connected on outer panel (305), and auxiliary is arranged in tensioning plate (301) at sorter guide rail Guide rail (311).

9. a kind of Novel direct wire type sorter according to claim 1, it is characterised in that: outer panel is provided on (305) Horizontal bolt is fixed strip through-hole (310), using bolt by outer panel and tensioning after bolt fixed strip through-hole (310) Plate (301) is fixedly connected.

10. a kind of Novel direct wire type sorter according to claim 1, it is characterised in that: braced frame (2) includes both ends Braced frame and intermediate support frame, both ends braced frame are securely removably connected at intermediate support frame both ends, centre branch Support frame frame includes that a pair of of upper rail (201), a pair of of lower guideway (202) and column (203), a pair of of upper rail (201) pass through welding Mode is fixedly connected on four columns (203) upper end, and a pair of of lower guideway (202) is fixedly connected on four columns by welding manner (203) pass through two rows crossbeam on and between column (203) lower end, a pair of of upper rail (201) and a pair of of lower guideway (202) (204) it is fixedly connected；A pair of of upper rail (201) using opposite mounting means, every upper rail include downside guide rail bar (205) and Upside guide rail bar (206), downside guide rail bar (205) are using plate vertical bending step structure three times, upside guide rail bar (206) For the trapezoidal cavity structure in section, guide-track groove is formed between lower end surface and downside guide rail bar (205)；A pair of of lower guideway (202) uses Opposite mounting means, every upper rail include the lower guideway item (207) and angle steel bar (208) of groove structure, and angle steel bar (208) is solid Surely it is connected at the concave part of lower guideway item (207) and along lower guideway item (207) length direction.