阅读说明：本技术 一种夹胶玻璃生产线系统 (Laminated glass production line system ) 是由 时运 于 2020-07-23 设计创作，主要内容包括：本发明涉及一种夹胶玻璃生产线系统。所述夹胶玻璃生产线系统包括上游线、分流产线、旋转组件与分流组件,上游线的端部转动地设置有弹性伸缩板体模组,分流产线包括上下排列的上玻璃线、中玻璃线与下玻璃线,上玻璃线对准上游线并抵持弹性伸缩板体模组,中玻璃线的端部转动地设置有上端板,下玻璃线的端部转动地设置有下端板,旋转组件包括动力气缸、连接杆、套圈带、上部轮柱与下部轮柱。所述夹胶玻璃生产线系统的占地面积相对较小。(The invention relates to a laminated glass production line system. Laminated glass production line system includes the upper reaches line, shunts and produces line, rotating assembly and reposition of redundant personnel subassembly, and the tip of upper reaches line is provided with elastic expansion plate body module with rotating, and reposition of redundant personnel is produced the line and is included last glass line, well glass line and the lower glass line of arranging from top to bottom, goes up the glass line and aims at the upper reaches line and supports elastic expansion plate body module, and the tip of well glass line is provided with the upper end plate with rotating, and the tip of lower glass line is provided with the lower end plate with rotating, and rotating assembly includes power cylinder, connecting rod, lasso area, upper portion wheel post and lower part wheel post. The floor area of the laminated glass production line system is relatively small.)

1. A laminated glass production line system is characterized by comprising an upstream line, a split production line, a rotating assembly and a split assembly, wherein the end part of the upstream line is rotatably provided with an elastic telescopic plate body module, the split production line comprises an upper glass line, a middle glass line and a lower glass line which are arranged up and down, the upper glass line is aligned with the upstream line and abuts against the elastic telescopic plate body module, the end part of the middle glass line is rotatably provided with an upper end plate, the side wall of the upper end plate is provided with an upper chute, the end part of the lower glass line is rotatably provided with a lower end plate, the side wall of the lower end plate is provided with a lower chute, the rotating assembly comprises a power cylinder, a connecting rod, a ferrule belt, an upper wheel column and a lower wheel column, the power cylinder is arranged on the side wall of the upstream line, the connecting rod transversely penetrates through the end part of the upstream line and is fixedly connected with one end of the, the other end is formed with the driving-disc, upper portion wheel post and lower part wheel post are all installed on the lateral wall of upper reaches line, the driving-disc is located to the lasso belt sleeve, on upper portion wheel post and the lower part wheel post, the reposition of redundant personnel subassembly includes reposition of redundant personnel pole and lower reposition of redundant personnel pole, the one end of going up the reposition of redundant personnel pole is fixed in on the upper portion wheel post, the other end is formed with the inserted bar, go up the inserted bar and insert in the last spout of locating the upper end plate with sliding, the one end of lower reposition of redundant personnel pole is fixed in on the lower part wheel post, the other end is formed with lower inserted bar, lower inserted.

2. The laminated glass production line system according to claim 1, wherein the rotary assembly further comprises a redundant wheel post rotatably mounted on a sidewall of the upstream line between the drive disk and the lower wheel post.

3. The laminated glass production line system as claimed in claim 2, wherein a space is formed between the redundant wheel column and the ferrule belt, the height position of the redundant wheel column is aligned with the top end of the upper end plate, and the diameter of the redundant wheel column is smaller than that of the lower wheel column.

4. The laminated glass production line system according to claim 3, wherein an upper coaxial rod is vertically protruded from an end of the upper shunt rod away from the upper insert rod, an end of the upper coaxial rod is coaxially fixed to an end of the upper wheel post, a lower coaxial rod is vertically protruded from an end of the lower shunt rod away from the lower insert rod, and an end of the lower coaxial rod is coaxially fixed to an end of the lower wheel post.

5. The laminated glass production line system according to claim 4, wherein the upper coaxial rod, the lower coaxial rod, the upper insert rod and the lower insert rod are all parallel, the length of the upper coaxial rod is greater than that of the lower coaxial rod, and the length of the upper shunt rod is less than that of the lower shunt rod.

6. The laminated glass production line system as claimed in claim 5, wherein the power cylinder is used for driving the upper shunt rod and the lower shunt rod to rotate through the connecting rod, so as to drive the upper insert rod to stir the upper end plate to overturn out of the middle glass line by utilizing the upper shunt rod, and the elastic telescopic plate body module is driven by the connecting rod to rotate and abut against the top of the upper end plate until the end of the elastic telescopic plate body module abuts against the end of the middle glass line, so as to convey the laminated glass in the upstream line onto the middle glass line.

7. The laminated glass production line system as claimed in claim 6, wherein the cleaning assembly comprises a working frame, a water pump, an arc-shaped delivery pipe, a lifting pipe and three water spraying heads, and the upstream line and the lower line are respectively and fixedly supported at two opposite ends of the working frame.

8. The laminated glass production line system as claimed in claim 7, wherein a water pump is installed at an upper portion of one end of the work frame, the arc-shaped conveying pipe is connected to the water pump and extends toward the lower glass line, and a bottom end of the lift pipe is connected to an end portion of the arc-shaped conveying pipe.

9. The laminated glass production line system as claimed in claim 8, wherein the upstream line is further provided at an end thereof with a swing rod, the lift pipe is rotatably connected at a top end thereof to a bottom end thereof, and the three water spray heads are mounted on the lift pipe and face the upper glass line, the middle glass line and the lower glass line, respectively.

10. The laminated glass production line system according to claim 9, wherein the lower wheel column has a length corresponding to a length of the upper wheel column, the drive disc has a diameter larger than a diameter of the lower wheel column, and the lower wheel column has a diameter larger than a diameter of the upper wheel column.

Technical Field

The invention relates to a laminated glass production line system.

Background

The laminated glass is a composite glass product which is made up by using two or several pieces of glass, between them a layer of organic polymer intermediate film or several layers of organic polymer intermediate films are sandwiched, and making the glass and intermediate film be permanently bonded into one body through the processes of special high-temp. prepressing (or vacuum-pumping) and high-temp. high-pressure treatment. Commonly used interlayer films for laminated glass include: PVB, SGP, EVA, PU, and the like. In addition, there are some more specific types such as a color interlayer glass, an SGX type printed interlayer glass, an XIR type LOW-E interlayer glass, and the like. Laminated glass with embedded decorative parts (metal meshes, metal plates and the like), laminated glass with embedded PET materials and other decorative and functional laminated glass. In a production line system of laminated glass, the laminated glass needs to be conveyed among different stations, and a plurality of production lines are generally used for conveying different types of glass, so that the occupied area is large.

Disclosure of Invention

Based on this, it is necessary to provide a laminated glass production line system with a small floor space.

A laminated glass production line system comprises an upstream line, a split production line, a rotating assembly and a split assembly, wherein the end part of the upstream line is rotatably provided with an elastic telescopic plate body module, the split production line comprises an upper glass line, a middle glass line and a lower glass line which are arranged up and down, the upper glass line is aligned with the upstream line and supports against the elastic telescopic plate body module, the end part of the middle glass line is rotatably provided with an upper end plate, the side wall of the upper end plate is provided with an upper chute, the end part of the lower glass line is rotatably provided with a lower end plate, the side wall of the lower end plate is provided with a lower chute, the rotating assembly comprises a power cylinder, a connecting rod, a ferrule belt, an upper wheel post and a lower wheel post, the power cylinder is arranged on the side wall of the upstream line, the connecting rod transversely penetrates through the end part of the upstream line and is fixedly connected with one end of the elastic telescopic plate body, the upper wheel post and the lower wheel post are both installed on the side wall of an upstream line, the driving disc is arranged on the ferrule belt sleeve, the upper wheel post and the lower wheel post are arranged on the ferrule belt sleeve, the shunt assembly comprises an upper shunt rod and a lower shunt rod, one end of the upper shunt rod is fixed on the upper wheel post, the other end of the upper shunt rod is provided with an upper insertion rod, the upper insertion rod is slidably inserted into an upper sliding groove formed in the upper end plate, one end of the lower shunt rod is fixed on the lower wheel post, the other end of the lower shunt rod is provided with a lower insertion rod, and the lower insertion rod is slidably inserted into a lower sliding.

In one embodiment, the rotating assembly further comprises a redundant wheel post rotatably mounted on the sidewall of the upstream line and located between the drive disc and the lower wheel post.

In one embodiment, a space is formed between the redundant wheel column and the ferrule belt, the height position of the redundant wheel column is aligned with the top end of the upper end plate, and the diameter of the redundant wheel column is smaller than that of the lower wheel column.

In one embodiment, an upper coaxial rod is vertically and convexly arranged at one end, away from the upper insertion rod, of the upper shunt rod, the end part of the upper coaxial rod is coaxially fixed at the end part of the upper wheel post, a lower coaxial rod is vertically and convexly arranged at one end, away from the lower insertion rod, of the lower shunt rod, and the end part of the lower coaxial rod is coaxially fixed at the end part of the lower wheel post.

In one of them embodiment, go up with the axostylus axostyle, down with the axostylus axostyle, go up the inserted bar and all be parallel with lower inserted bar, go up the length of coaxial pole and be greater than down the length of coaxial pole, go up the length of reposition of redundant personnel and be less than down the length of reposition of redundant personnel.

In one embodiment, the power cylinder is used for driving the upper shunt rod and the lower shunt rod to rotate through the connecting rod, so that the upper shunt rod drives the upper insertion rod to poke the upper end plate to overturn out of the middle glass line, the elastic telescopic plate body module is driven by the connecting rod to rotate and abut against the top of the upper end plate until the end of the elastic telescopic plate body module abuts against the end of the middle glass line, and the laminated glass in the upstream line is conveyed to the middle glass line.

In one embodiment, the glass cleaning device comprises a cleaning assembly, wherein the cleaning assembly comprises a working frame, a water pump, an arc-shaped conveying pipe, a lifting pipe and three water spraying heads, and the upstream wire and the lower glass wire are fixedly supported at two opposite ends of the working frame respectively.

In one embodiment, the water pump is installed at an upper portion of one end of the work frame, the arc-shaped delivery pipe is connected to the water pump and extends toward the lower glass line, and the bottom end of the elevator pipe is connected to an end portion of the arc-shaped delivery pipe.

In one embodiment, the end of the upstream line is further provided with a swing rod, the top end of the lifting pipe is rotatably connected to the bottom end of the swing rod, and the three water spray heads are all mounted on the lifting pipe and respectively face the upper glass line, the middle glass line and the lower glass line.

In one embodiment, the lower wheel post has a length corresponding to the length of the upper wheel post, the drive disc has a diameter greater than the diameter of the lower wheel post, and the lower wheel post has a diameter greater than the diameter of the upper wheel post.

When the laminated glass production line system is used, laminated glass is conveyed from an upstream line and conveyed to an upper glass line through the elastic telescopic plate body module. When a glass production line needs to be changed, the power cylinder drives the upper shunt rod and the lower shunt rod to rotate through the connecting rod, so that the upper shunt rod drives the upper insertion rod to stir the upper end plate to turn out of the middle glass line, the elastic telescopic plate body module rotates under the driving of the connecting rod and abuts against the top of the upper end plate until the end of the elastic telescopic plate body module abuts against the end of the middle glass line, and the laminated glass in the upstream line is conveyed to the middle glass line. In the conveying process of the laminated glass production line, the split flow production line comprises an upper glass line, a middle glass line and a lower glass line which are arranged up and down, and the three glass lines are overlapped and aligned up and down, so that the occupied area is small.

Drawings

Fig. 1 is a schematic perspective view of a laminated glass production line system according to an embodiment.

FIG. 2 is a perspective view of another perspective view of the laminated glass manufacturing line system of FIG. 1.

FIG. 3 is a side view of an embodiment of a laminated glass production line system.

Fig. 4 is a partially enlarged view of fig. 3 at D.

Detailed Description

The invention provides a laminated glass production line system. For example, the laminated glass production line system comprises an upstream line, a distribution production line, a rotating assembly and a distribution assembly, wherein an elastic telescopic plate body module is rotatably arranged at the end part of the upstream line, and the distribution production line comprises an upper glass line, a middle glass line and a lower glass line which are vertically arranged. For example, the upper glass line is aligned with the upstream line and abuts against the elastic telescopic plate body module, the end part of the middle glass line is rotatably provided with an upper end plate, the side wall of the upper end plate is provided with an upper chute, the end part of the lower glass line is rotatably provided with a lower end plate, the side wall of the lower end plate is provided with a lower chute, the rotating assembly comprises a power cylinder, a connecting rod, a ferrule belt, an upper wheel column and a lower wheel column, and the power cylinder is installed on the side wall of the upstream line. For example, the connecting rod transversely wears to locate the tip of upper reaches line and with the one end fixed connection of the flexible telescopic plate body module, the power cylinder is connected to the one end of connecting rod, and the other end is formed with the driving-disc, and upper portion wheel post and lower portion wheel post are all installed on the lateral wall of upper reaches line. For example, the ferrule belt is sleeved on the driving disc, the upper wheel column and the lower wheel column, the shunt assembly comprises an upper shunt rod and a lower shunt rod, one end of the upper shunt rod is fixed on the upper wheel column, and the other end of the upper shunt rod is provided with an upper inserted rod. For example, the upper insertion rod is slidably inserted into the upper chute of the upper end plate, one end of the lower shunt rod is fixed on the lower wheel post, the other end of the lower shunt rod is provided with the lower insertion rod, and the lower insertion rod is slidably inserted into the lower chute of the lower end plate.

For example, referring to fig. 1 to 4, a laminated glass production line system includes an upstream line 101, a distribution line 105, a rotating assembly 10 and a distribution assembly 20, wherein an end of the upstream line 101 is rotatably provided with an elastically stretchable plate body module 102, the distribution line 105 includes an upper glass line 103, a middle glass line 104 and a lower glass line 106 which are arranged up and down, the upper glass line 103 is aligned with the upstream line 101 and abuts against the elastically stretchable plate body module 102, an end of the middle glass line 104 is rotatably provided with an upper end plate 1045, a side wall of the upper end plate 1045 is provided with an upper chute 1048, an end of the lower glass line 106 is rotatably provided with a lower end plate 1065, a side wall of the lower end plate 1068 is provided with a lower chute 1068, the rotating assembly 10 includes a power cylinder 11, a connecting rod, a ferrule belt 12, an upper wheel column 13 and a lower wheel column 14, the power cylinder 11 is mounted on the side wall of the upstream line 101, the connecting rod transversely penetrates through the end of the upstream line 101 and is fixedly connected with one end, one end of the connecting rod is connected with the power cylinder 11, the other end is formed with a driving disc 115, the upper wheel column 13 and the lower wheel column 14 are both installed on the side wall of the upstream line 101, the ferrule belt 12 is sleeved on the driving disc 115, the upper wheel column 13 and the lower wheel column 14, the shunt assembly 20 comprises an upper shunt rod 21 and a lower shunt rod 23, one end of the upper shunt rod 21 is fixed on the upper wheel column 13, the other end is formed with an upper insertion rod 215, the upper insertion rod 215 is slidably inserted into an upper chute 1048 of an upper end plate 1045, one end of the lower shunt rod 23 is fixed on the lower wheel column 14, the other end is formed with a lower insertion rod 235, and the lower insertion rod 235 is slidably inserted into a lower chute 1068 of a lower end plate 1065.

For example, the upstream line 101, the upper glass line 103, the middle glass line 104 and the lower glass line 106 are all production lines, i.e., production conveying lines, for conveying laminated glass. When the laminated glass production line system is used, laminated glass is conveyed from the upstream line 101 and conveyed to the upper glass line 103 through the elastic telescopic plate body module 102. When the glass production line needs to be changed, the power cylinder 11 drives the upper shunt rod 21 and the lower shunt rod 23 to rotate through the connecting rod, so that the upper shunt rod 21 drives the upper insertion rod 215 to poke the upper end plate 1045 to turn out the middle glass line 104, the elastic telescopic plate body module 102 is driven by the connecting rod to rotate and abut against the top of the upper end plate 1045 until the end of the elastic telescopic plate body module 102 abuts against the end of the middle glass line 104, and the laminated glass in the upstream line 101 is conveyed to the middle glass line 104. In the conveying process of the laminated glass production line, the shunt production line 105 comprises an upper glass line 103, a middle glass line 104 and a lower glass line 106 which are arranged up and down, and the three glass lines are overlapped and aligned up and down, so that the occupied area is small.

For example, to better join the upstream line 101 with the middle glass line 104, the rotating assembly 10 further comprises a redundant wheel post 15, the redundant wheel post 15 being rotatably mounted on the side wall of the upstream line 101 and located between the driving disk 115 and the lower wheel post 14. A space is formed between the redundant wheel post 15 and the ferrule belt 12, namely, the ferrule belt 12 does not drive the redundant wheel post 15 to rotate. The height position of the redundant wheel post 15 is aligned with the top end of the upper end plate 1045, and the diameter of the redundant wheel post 15 is smaller than that of the lower wheel post 14. An upper coaxial rod 216 is vertically and convexly arranged at one end of the upper shunt rod 21 far away from the upper inserted rod 215, the end part of the upper coaxial rod 216 is coaxially fixed at the end part of the upper wheel post 13, a lower coaxial rod 236 is vertically and convexly arranged at one end of the lower shunt rod 23 far away from the lower inserted rod 235, and the end part of the lower coaxial rod 236 is coaxially fixed at the end part of the lower wheel post 14. The upper coaxial rod 216, the lower coaxial rod 236, the upper insert rod 215 and the lower insert rod 235 are all parallel, the length of the upper coaxial rod 216 is greater than that of the lower coaxial rod 236, and the length of the upper shunt rod 21 is less than that of the lower shunt rod 23. The power cylinder 11 is used for driving the upper shunt rod 21 and the lower shunt rod 23 to rotate through the connecting rod, so that the upper shunt rod 21 drives the upper insertion rod 215 to poke the upper end plate 1045 to turn out the middle glass line 104, the elastic telescopic plate body module 102 is driven by the connecting rod to rotate and abut against the top of the upper end plate 1045 until the end of the elastic telescopic plate body module 102 abuts against the end of the middle glass line 104, and the laminated glass in the upstream line 101 is conveyed to the middle glass line 104. The connection of the middle glass wire 104 and the upstream wire 101 is realized by the rod bodies through the arrangement of the upper coaxial rod 216, the lower coaxial rod 236, the upper inserting rod 215 and the lower inserting rod 235. During the rotation of the upper end plate 1045, the lower end plate 1065 is rotated by the lower shunt rod 23, however, the lower glass wire 106 has no glass, and thus the relationship is not great.

For example, to facilitate cleaning the glass being conveyed, the laminated glass production line system further includes a cleaning assembly 30, the cleaning assembly 30 includes a working frame 31, a water pump 32, an arc-shaped conveying pipe 33, a lifting pipe 34 and three water spraying heads 35, and the upstream line 101 and the lower glass line 106 are respectively and fixedly supported at two opposite ends of the working frame 31. The water pump 32 is installed at an upper portion of one end of the work frame 31, the arc-shaped delivery pipe 33 is connected to the water pump 32 and extends toward the lower glass line 106, and the lower end of the elevator tube 34 is connected to an end portion of the arc-shaped delivery pipe 33. The end of the upstream line 101 is further provided with a swing rod 107, the top end of the elevator tube 34 is rotatably connected to the bottom end of the swing rod 107, and the three water spray heads 35 are all mounted on the elevator tube 34 and face the upper glass line 103, the middle glass line 104 and the lower glass line 106, respectively. The length of lower wheel post 14 corresponds to the length of upper wheel post 13, the diameter of drive disc 115 is greater than the diameter of lower wheel post 14, and the diameter of lower wheel post 14 is greater than the diameter of upper wheel post 13. Through setting up cleaning assembly 30, can conveniently wash the glass in the transportation process.

In particular, the circumferential surface of the lower wheel post 14 is formed with a driving frictional surface 147, the circumferential surface of the upper wheel post 13 is formed with a follow-up frictional surface 137, the side wall of the upstream line 101 is recessed with an ascending groove 108 and a descending groove 109, the ascending groove 108 extends from the lower wheel post 14 toward the upper wheel post 13 on the side adjacent to the upper glass line 103, the descending groove 109 extends from the upper wheel post 13 toward the driving disk 115, the width of the ascending groove 108 is greater than that of the descending groove 109, and the length of the ascending groove 108 is greater than that of the descending groove 109. The lower end of the rising groove 108 is extended to form a through hole penetrating the bottom of the upstream wire 101. For example, in order to facilitate connection between the upstream line 101 and the lower glass line 106, the laminated glass production line system further includes a reciprocating assembly 40, the reciprocating assembly 40 includes a first reciprocating cylinder 401, a first reciprocating push rod 41, a second reciprocating cylinder 402 and a second reciprocating push rod (not shown), the first reciprocating cylinder 401 is mounted at the top of the working frame 31, one end of the first reciprocating push rod 41 is connected to an output shaft of the first reciprocating cylinder 401, the other end of the first reciprocating push rod passes through the through hole, a shaft sleeve is fixed at an end of the first reciprocating push rod 41, the shaft sleeve is rotatably sleeved on the shaft rod and located in the ascending groove 108, and the shaft rod is coaxially fixed at an end of the lower wheel post 14. The second reciprocating cylinder 402 is mounted on the side wall of the upstream line 101 and is adjacent to the lower end of the descending groove 109, one end of the second reciprocating push rod is connected to the output shaft of the second reciprocating cylinder 402, the other end of the second reciprocating push rod is fixed with a bearing, the bearing is rotatably sleeved on a shaft post and is positioned in the descending groove 109, and the shaft post is coaxially fixed at the end of the upper wheel post 13. The second reciprocating push rod is slidably disposed in the descent channel 109.

For example, when it is required to convey the laminated glass of the upstream line 101 to the lower glass line 106, the first reciprocating cylinder 401 is configured to drive the lower wheel post 14 to move along the ascending groove 108 to push the upper wheel post 13 by the lower wheel post 14, so that the driving disc 115, the redundant wheel post 15 and the lower wheel post 14 are sleeved with the race belt 12, the second reciprocating cylinder 402 is configured to drive the upper wheel post 13 to move along the descending groove 109 to avoid the lower wheel post 14, so that the driving friction surface 147 of the lower wheel post 14 is in friction fit with the follow-up friction surface 137, and the top of the lower shunt rod 23 enters the side of the upper shunt rod 21 facing the upstream line 101 under the driving of the lower wheel post 14. At this time, the redundant wheel post 15 is acted upon, and the upper wheel post 13 is disengaged from the loop belt 12 and is not directly driven by the loop belt 12. During operation, the driving disc 115 is used to drive the lower wheel post 14 to rotate through the ferrule belt 12, so as to drive the lower shunt rod 23 to toggle the lower end plate 1065 to turn over, and the driving friction surface 147 of the lower wheel post 14 drives the upper wheel post 13 to rotate reversely, so as to utilize the upper shunt rod 21 to toggle the upper end plate 1045 to fall down into the middle glass line 104, the elastic expansion plate module 102 is synchronously driven by the connecting rod to rotate and descend, the end of the elastic expansion plate module 102 moves under the guidance of the upper end plate 1045, until the end of the elastic expansion plate module 102 abuts against the end of the lower glass line 106, so as to transfer the laminated glass in the upstream line 101 to the lower glass line 106.

In the glass flow dividing process, the upper/lower insert pins 235 can slide in the upper/lower slide grooves 1068 during the process of driving the upper/lower end plate 1065 to turn, by the arrangement of the upper slide grooves 1048 of the upper end plate 1045 and the lower slide grooves 1068 of the lower end plate 1065. The upper inserting rod 215 and the lower inserting rod 235 can be prevented from being separated from the upper end plate 1045 and the lower end plate 1065, and the connection stability is ensured. By setting the lengths of the upper coaxial rod 216 and the lower coaxial rod 236, after the lower wheel post 14 moves to the end of the ascending trench 108, no interference occurs between the upper shunt rod 21 and the lower shunt rod 23, and the parallelism is not contradictory. And the lower wheel posts 14 can be in friction fit with the upper wheel posts 13 after rising, the lower wheel posts 14 drive the lower end plate 1065 to turn out to bear the butt of the elastic telescopic plate body module 102, and simultaneously, the upper wheel posts 13 rotating in the opposite direction can be utilized to drive the upper shunt rods 21 to move in the opposite direction to drive the upper end plate 1045 to fall down into the middle glass line 104, so that the upper end plate 1045 is far away from the action process of the elastic telescopic plate body module to avoid the obstruction of the elastic telescopic plate body module, and the fallen upper end plate 1045 can guide the end part of the elastic telescopic plate body module 102 to avoid the end part of the elastic telescopic plate body module 102 from being inserted into the middle glass line 104, and can smoothly slide into the lower glass line 106 along the upper end plate 1045, thereby providing a guiding function and improving the smoothness when changing to the lower glass line 106. Finally, the widths of the ascending groove 108 and the descending groove 109 are set so that the lower wheel post 14 does not enter the descending groove 109 at will because the diameter of the axle post is large and is obstructed by the descending groove 109.