CN220588904U - Ball circulation lifting device - Google Patents

Abstract

The utility model provides a ball circulation lifting device, comprising: the base is internally provided with a material receiving slideway, and the top of the base is provided with a material receiving opening communicated with the upper end of the material receiving slideway; the spiral slide rail is arranged at the top of the base; the limiting rods are arranged at the top of the base, are arranged on one side of the spiral slide rail in parallel at intervals and form a limiting channel with the spiral slide rail, and the other end of the receiving slide rail is communicated with the lower end of the limiting channel; the blanking device comprises a blanking slide rail arranged at one side of the top of a limiting rod and one end of the blanking slide rail is communicated with the upper end of a limiting channel, a blanking barrel is arranged after the other end of the blanking slide rail extends downwards in an arc shape, a buffering elastic piece which is arranged opposite to the other end of the blanking slide rail is connected in the blanking barrel through an elastic piece, the upper part of the buffering elastic piece is obliquely arranged, the lower end of the buffering elastic piece extends downwards vertically to form a guide part, and one side, close to the blanking slide rail, of the buffering elastic piece is enclosed with the blanking barrel to form a blanking channel with the inner diameter being big up. The ball falling direction can be stabilized, and the stability of the lifting device ball circulation is improved.

Description

Ball circulation lifting device

Technical Field

The utility model relates to the field of lifting devices, in particular to a ball circulation lifting device.

Background

At present, along with the improvement of living standard of people, toys which are helpful for intelligence development and cognitive training are layered endlessly, in order to enable children to intuitively learn and enlighten physical knowledge while playing, a ball elevator exists in the existing children toys, and according to the figure 1, the ball elevator is lifted to the highest point through the rotation of a spiral sliding rail, and then falls off through an arc-shaped slideway at the side, so that the ball falls off the elevator rapidly, and the children can intuitively learn the spiral lifting while avoiding the ball from being blocked in the elevator.

However, the conventional ball lifter has the following drawbacks: the arc slide makes the ball can spiral whereabouts at the in-process that slides and drop, leads to the lift unable to retrieve automatically to the ball that arc slide dropped and realizes the circulation lift, and the ball that drops easily looses and rolls away, just can go on the lift recreation again after needing to pick up the ball that drops, and the troublesome operation, and the in-process is easy to lose the ball, reduces user's use and experience and feel.

The utility model aims to solve the problems of the prior art and designs a ball circulation lifting device.

Disclosure of Invention

The utility model provides a ball circulation lifting device which can effectively solve the problems in the prior art.

The technical scheme of the utility model is as follows:

a ball circulation lifting device comprising:

the device comprises a base, a driving device and a material receiving slide way are arranged in the base, and a material receiving opening communicated with the upper end of the material receiving slide way is formed in the top of the base;

the spiral slide rail is arranged at the top of the base and is in linkage arrangement with the output end of the driving device;

the limiting rods are arranged at the top of the base, are arranged on one side of the spiral slide rail in parallel at intervals and form a limiting channel with the spiral slide rail, and the other end of the material receiving slide rail is communicated with the lower end of the limiting channel;

the blanking device comprises a blanking slide rail arranged at one side of the top of a limiting rod and one end of the blanking slide rail is communicated with the upper end of the limiting channel, a blanking barrel is arranged after the arc-shaped downward extension of the other end of the blanking slide rail, a buffering elastic piece which is arranged opposite to the other end of the blanking slide rail is connected in the blanking barrel through an elastic piece, the upper part of the buffering elastic piece is obliquely arranged, the lower end of the buffering elastic piece vertically extends downwards to form a guide part, one side of the buffering elastic piece, which is close to the blanking slide rail, forms a blanking channel with a large inner diameter and a small inner diameter in a surrounding mode with the blanking barrel, a ball is arranged through the spiral of the spiral slide rail, the spiral of the spiral slide rail ascends in a limiting mode, the blanking slide rail slides into the blanking barrel in an accelerating mode, and after buffering of the buffering elastic piece, the lower end of the blanking channel is expanded, and the ball vertically descends into a receiving port.

Further, the buffering shell fragment is towards keeping away from one side arc sunken setting of blanking slide rail is so that the blanking passageway is the bench taper of internal diameter big-end-up, the buffering shell fragment is kept away from one side of blanking slide rail with from the top down is equipped with a plurality of first springs and a plurality of second springs in proper order between the inner wall of blanking section of thick bamboo, the length of first spring is less than the length of second spring.

Further, a rough surface is arranged on the upper portion of the buffering elastic sheet, which is close to one side surface of the blanking slide rail, and a smooth surface is arranged on the guide portion, which is close to one side surface of the blanking slide rail.

Further, the automatic feeding device comprises a receiving device, the receiving device comprises a receiving cylinder which is detachably arranged at the top of the receiving port and corresponds to the blanking channel, the inner diameter of the receiving cylinder is gradually increased from bottom to top, a bucket-shaped flexible sleeve is arranged on the inner side of the receiving cylinder, an upper port of the flexible sleeve is detachably arranged on the receiving cylinder and corresponds to the blanking channel, and a lower port of the flexible sleeve is suspended and corresponds to the receiving port.

Further, the side wall of the lower part of the flexible sleeve is provided with a plurality of elastic pleats which are vertically arranged, and the lower port of the flexible sleeve is in a zigzag shape.

Further, still include receiving device, receiving device including can dismantle locate connect the feed port top and with the corresponding receiving feed cylinder of blanking passageway, the internal diameter that connects the feed cylinder increases from the bottom up gradually, connect the upper port circumference interval rotation of feed cylinder to be equipped with a plurality of buffer plates, a plurality of the one end of buffer plate is set up to transversely locate connect a plurality of buffer parts on the feed cylinder upper port, a plurality of the buffer part encloses and closes and form and connect the material district, a plurality of the other end of buffer plate is located connect the outside of feed cylinder and form a plurality of balancing parts, a plurality of when the ball drops down the one end of buffer plate a plurality of balancing parts warp, connect the material district expansion so that the ball falls into connect in the feed cylinder get into connect behind the material slide, a plurality of balancing parts reset so that a plurality of buffer parts reset condensation connect the material district.

Further, the top of base is equipped with the connector, the spiral slide rail includes a plurality of spiral pieces, the upper and lower both ends of spiral piece are equipped with spacing mouth respectively, a plurality of between the spiral piece the successive layer pass through with the bolt spare of spacing mouth looks adaptation is connected, drive arrangement's top output be equipped with the grafting end of spacing mouth looks adaptation, the lowest layer the lower extreme of spiral piece passes the connector passes through spacing the inserting of spacing mouth is located on the grafting end, the spacing mouth of the highest layer the spiral piece upper end is connected with the top sealing piece through the bolt spare.

Further, the protruding arc that forms two intervals settings in one side top of connector, the gag lever post includes the stopper that a plurality of arcs set up, the upper end undercut of stopper forms the spliced groove, the lower part shrink of stopper form with the grafting portion of spliced groove looks adaptation, a plurality of between the stopper cup joint layer by layer, the upper strata the grafting portion of stopper inserts and locates the lower floor in the grafting groove of stopper, the lowest layer the grafting portion of stopper is spacing to be inserted and locate two between the arc, blanking slide rail locates the highest one side of stopper, the highest side the opposite side of stopper is equipped with the cover and locates the sleeve in the top sealing member outside, the one end of blanking slide rail runs through behind the sleeve intercommunication spacing passageway.

Accordingly, the present utility model provides the following effects and/or advantages:

1. according to the ball circulation lifting device provided by the utility model, the balls ascend along the limit channel through the spiral of the spiral slide rail to enter the blanking slide rail to slide into the blanking barrel in an acceleration way, after being buffered by the extrusion buffering elastic sheet, the lower end of the blanking channel expands the balls to vertically fall into the material receiving opening to enter the material receiving slide way. Therefore, through the buffer effect of the buffer elastic sheet, the balls accelerated by the blanking slide rail can be buffered when falling, and the balls vertically fall into the receiving slide rail through the guide of the guide part, so that the falling direction of the balls is stable, the balls falling after lifting can be stably recovered through the receiving opening, the balls are conveyed to the lower end of the spiral slide rail for circulating lifting, the balls can be stably and circularly lifted after being put in for one time, the operation is simple, the probability of losing the balls is reduced, and the use experience of a user is improved.

2. The ball circulation lifting device provided by the utility model further comprises a receiving device, wherein the receiving device comprises a receiving cylinder which is detachably arranged at the top of the receiving opening and corresponds to the blanking channel, the inner diameter of the receiving cylinder is gradually increased from bottom to top, a bucket-shaped flexible sleeve is arranged on the inner side of the receiving cylinder, the upper port of the flexible sleeve is detachably arranged with the receiving cylinder and corresponds to the blanking channel, and the lower port of the flexible sleeve is suspended and corresponds to the receiving opening. Therefore, when the balls fall into the receiving cylinder, the buffer unloading force of the flexible sleeve is not easy to bounce to separate from the receiving cylinder, so that the balls smoothly fall into the receiving port, the receiving stability of the receiving port is improved, and the lifting device is improved to recover the balls and then circularly lift the balls.

It is to be understood that both the foregoing general description and the following detailed description of the present utility model are exemplary and explanatory and are intended to provide further explanation of the utility model as claimed.

Drawings

Fig. 1 is a partial schematic view of a conventional ball elevator.

Fig. 2 is a schematic front view of a first embodiment of the present utility model.

Fig. 3 is a schematic exploded perspective view of a first embodiment of the present utility model.

Fig. 4 is a schematic top view of the blanking device in fig. 2.

Fig. 5 is a schematic cross-sectional view of the structure at A-A in fig. 4.

Fig. 6 is a schematic diagram of a front view of the base in fig. 2.

Fig. 7 is a schematic perspective sectional structure at B-B in fig. 6.

Fig. 8 is a schematic half-sectional structure of a receiving device according to a first embodiment of the present utility model.

Fig. 9 is a schematic side view of a second embodiment of the present utility model.

Fig. 10 is a schematic perspective view of a receiving device in a second embodiment of the present utility model.

Detailed Description

For the convenience of understanding by those skilled in the art, the structure of the present utility model will now be described in further detail with reference to the accompanying drawings:

example 1

Referring to fig. 1-8, a ball circulation lifting device includes:

the automatic feeding device comprises a base 1, wherein a driving device 11 and a material receiving slide way 12 are arranged in the base 1, and a material receiving opening 13 communicated with the upper end of the material receiving slide way 12 is formed in the top of the base 1; in this embodiment, the driving device 11 is a motor, and in other embodiments, the driving device 11 may be another existing driving device;

the spiral slide rail 2 is arranged at the top of the base 1 and is in linkage arrangement with the output end of the driving device 11;

the limiting rods 3 are arranged at the top of the base 1, the limiting rods 3 are arranged on one side of the spiral slide rail 2 at intervals in parallel and form limiting channels 31 with the spiral slide rail 2, and the other ends of the receiving slide ways 12 are communicated with the lower ends of the limiting channels 31;

the blanking device 4 comprises a blanking slide rail 41 arranged at one side of the top of the limit rod 3, one end of the blanking slide rail 41 is communicated with the upper end of the limit channel 31, a blanking cylinder 42 is arranged after the other end of the blanking slide rail 41 extends downwards in an arc shape, a buffer elastic sheet 43 which is arranged opposite to the other end of the blanking slide rail 41 is connected in the blanking cylinder 42 through an elastic piece, the upper part of the buffer elastic sheet 43 is obliquely arranged, the lower end of the buffer elastic sheet vertically extends downwards to form a guide part 433, one side of the buffer elastic sheet 43 close to the blanking slide rail 41 and the blanking cylinder 42 enclose to form a blanking channel 44 with a large inner diameter and a small inner diameter, in this embodiment, one side of the upper part of the buffer elastic sheet 43 close to the blanking slide rail 41 is a rough surface 434, the rough surface 434 is specifically made of a flexible material, and can be realized by adhering flexible materials such as rubber, silica gel and the like on the surface of the buffer elastic material with enough friction force, so that the friction force when balls fall down in an accelerated way is increased, the speed of the balls is buffered better, namely, the lower part of the buffer elastic sheet 43 is formed by the guide part 435, and one side 435 close to the blanking slide rail 41 is made of a smooth surface;

the balls rise along the limit channel 31 through the spiral of the spiral slide rail 2 to enter the blanking slide rail 41 to accelerate sliding down into the blanking barrel 42, after being extruded and buffered by the buffer elastic sheet 43, the lower end of the blanking channel 44 enlarges the balls to vertically fall into the material receiving opening 13 to enter the material receiving slide rail 12.

The setting of above-mentioned structure, through the cushioning effect of buffering shell fragment, can cushion the ball after accelerating through blanking slide rail when the whereabouts, and pass through the vertical whereabouts of direction of guide part gets into connect the material slide, make ball whereabouts direction stable, and then make the material receiving mouth retrieve the ball that drops after promoting steadily, and carry the lower extreme circulation promotion to spiral slide rail, put in once the ball and can realize the stable circulation lift of ball, easy operation reduces the ball and loses probability, improves user's use experience and feel.

In order to improve the effect of buffering shell fragment 43 to ball whereabouts buffering and direction, buffering shell fragment 43 is kept away from one side arc sunken setting of blanking slide rail 41 is so that blanking passageway 44 is the bench taper that the internal diameter is big-end-up, buffering shell fragment 43 is kept away from one side of blanking slide rail 41 with from the top down is equipped with a plurality of first springs 431 and a plurality of second springs 432 in proper order between the inner wall of blanking section of thick bamboo 42, the length of first spring 431 is less than the length of second spring 432. In this embodiment, the number of the first springs 431 and the second springs 432 is two and symmetrically arranged, and in other embodiments, the number of the first springs 431 and the second springs 432 may be adaptively adjusted according to specific situations.

Since the ball falls into contact with the receiving port 13, there is a possibility that the ball collides with the side wall of the receiving port 13 to pop out and separate from the receiving port 13, and the receiving port 13 fails, in order to improve the receiving stability of the receiving port 13 and improve the success rate of the ball falling into the receiving port 13, the device further comprises a receiving device 5, the receiving device 5 comprises a receiving cylinder 51 detachably arranged at the top of the receiving port 13 and corresponding to the blanking channel 44, the inner diameter of the receiving cylinder 51 is gradually increased from bottom to top, a bucket-shaped flexible sleeve 52 is arranged at the inner side of the receiving cylinder 51, in this embodiment, the flexible sleeve 52 is made of a material rich in elasticity, in other embodiments, the flexible sleeve 52 can also be made of other flexible materials rich in elasticity, such as rubber, silica gel, etc., the upper port of the flexible sleeve 52 is detachably arranged with the receiving cylinder 51 and corresponds to the blanking channel 44, and the lower port of the flexible sleeve 52 is suspended and corresponds to the receiving port 13. When the balls fall into the receiving cylinder 51, the balls are not easy to bounce off the receiving cylinder 51 by the buffer unloading force of the flexible sleeve 52, so that the balls smoothly fall into the receiving port 13.

Because there is the difference in size between the balls, so in order to avoid the balls from being blocked in the flexible sleeve 52 and failing to fall, the lower side wall of the flexible sleeve 52 is provided with a plurality of elastic pleats 521 which are vertically arranged, and the lower port of the flexible sleeve 52 is provided with a saw-tooth shape, so that the flexible sleeve 52 can adapt to the balls with different sizes.

For the accomodating of the ball circulation elevating gear of being convenient for, temper children's ability of working simultaneously, the top of base 1 is equipped with connector 14, spiral slide rail 2 includes a plurality of spiral pieces 21, the upper and lower both ends of spiral piece 21 are equipped with spacing mouth 211 respectively, a plurality of between the spiral piece 21 the layer by layer through with the bolt piece 22 of spacing mouth 211 looks adaptation is connected, the top output of drive arrangement 11 be equipped with the grafting end 111 of spacing mouth 211 looks adaptation, the lower extreme of the lowest layer spiral piece 21 passes connector 14 passes through spacing the inserting of spacing mouth 211 is located on the grafting end 111, the spacing mouth 211 of the highest layer spiral piece 21 upper end is connected with the top piece 23 through bolt piece 22, thereby is convenient for the dismantlement and the assembly of spiral slide rail 2.

For the accomodating of the ball circulation elevating gear of being convenient for, temper children's ability of working simultaneously, the protruding arc 15 that sets up in two intervals that forms in one side top of connector 14, gag lever post 3 includes the stopper 32 that a plurality of arcs set up, the upper end undercut of stopper 32 forms inserting groove 321, the lower part shrink of stopper 32 form with inserting portion 322 of inserting groove 321 looks adaptation, a plurality of cup joint between the stopper 32 layer by layer, last layer inserting portion 322 of stopper 32 inserts in inserting groove 321 of stopper 32 of locating the next layer, the lowest layer inserting portion 322 of stopper 32 is spacing to be inserted and locate two between the arc 15, blanking slide rail 41 locates the one side of stopper 32 of highest layer, the opposite side of stopper 32 is equipped with the cover and locates sleeve 33 in the stopper 23 outside, the one end of blanking slide rail 41 runs through behind the sleeve 33 intercommunication spacing passageway 31, thereby be convenient for dismantle and assemble of gag lever post 3.

Example two

Referring to fig. 9 to 10, this embodiment is different from the first embodiment in that:

in order to improve the stability of the receiving port 13 and the success rate of the falling of the balls into the receiving port 13, and further comprise a receiving device 5, wherein the receiving device 5 comprises a receiving cylinder 51 detachably arranged at the top of the receiving port 13 and corresponding to the blanking channel 44, in this embodiment, the receiving device 5 and the receiving port 13 are detachably arranged through screw connection, in other embodiments, the receiving device 5 and the receiving port 13 can also be detachably arranged through other existing connection modes, such as clamping connection, etc., the inner diameter of the receiving cylinder 51 is gradually increased from top to bottom, the upper port of the receiving cylinder 51 is circumferentially and alternately provided with a plurality of buffer plates 53, one end of each buffer plate 53 is provided with a plurality of buffer parts 532 transversely arranged on the upper port of the corresponding receiving cylinder 51, the buffer parts 532 are surrounded to form a receiving area 54, the other end of each buffer plate 53 is arranged on the outer side of the corresponding receiving cylinder 51 to form a plurality of balance parts 531, in the embodiment, the area of each balance part 531 is larger than twice the area of each buffer part 532, so that the balance parts 531 can drive the corresponding buffer parts 532 to reset under the action of self gravity, in other embodiments, the area, weight and other parameters of the balance parts 531 and the buffer parts 532 can be adaptively adjusted according to specific conditions, when the balls fall down to press one end of each buffer plate 53, the balance parts 531 are tilted upwards, the receiving area 54 is enlarged to enable the balls to fall into the corresponding receiving cylinder 51 and enter the corresponding receiving slide ways 12, the balance parts 531 reset to enable the buffer parts 532 to reset and condense the material receiving area 54, so that the falling balls are buffered and unloaded by the buffer plates 53, the balls are not easy to collide with the material receiving cylinder 51 and then are ejected out of the lifter, and the balance parts 531 control the buffer plates 53 to reset and condense the material receiving area 54, so that the balls can not be separated from the material receiving cylinder 51 even if collision occurs between the balls and the material receiving cylinder 51 after entering the material receiving cylinder 51.

It should be noted that the implementation principle and the technical effects of the present embodiment are the same as those of the first embodiment, and for brevity, reference may be made to the corresponding content of the first embodiment.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (8)

1. A ball circulation lifting device, comprising:

the automatic feeding device comprises a base (1), wherein a driving device (11) and a receiving slideway (12) are arranged in the base, and a receiving opening (13) communicated with the upper end of the receiving slideway (12) is formed in the top of the base (1);

the spiral slide rail (2) is arranged at the top of the base (1) and is in linkage arrangement with the output end of the driving device (11);

the limiting rods (3) are arranged at the top of the base (1), the limiting rods (3) are arranged on one side of the spiral slide rail (2) at intervals in parallel and form limiting channels (31) with the spiral slide rail (2), and the other ends of the receiving slide ways (12) are communicated with the lower ends of the limiting channels (31);

the blanking device (4) comprises a blanking slide rail (41) arranged at one side of the top of a limiting rod (3) and communicated with one end of the blanking slide rail (31), a blanking cylinder (42) is arranged after the arc of the other end of the blanking slide rail (41) extends downwards, a buffering elastic piece (43) which is arranged opposite to the other end of the blanking slide rail (41) is connected in the blanking cylinder (42) through an elastic piece, the upper part of the buffering elastic piece (43) is obliquely arranged, the lower end of the buffering elastic piece extends downwards vertically to form a guide part (433), the buffering elastic piece (43) is close to one side of the blanking slide rail (41) and the blanking cylinder (42) are enclosed to form a blanking channel (44) with the upper and lower inner diameters, balls enter the blanking slide rail (41) in a limiting mode along the limiting channel (31) through a spiral of the spiral slide rail (2) and slide down in the blanking cylinder (42), after the buffering elastic piece (43) is extruded, the lower end of the blanking channel (44) is expanded to the balls vertically fall into a material receiving port (13).

2. The ball circulation lifting device according to claim 1, wherein the buffer elastic sheet (43) is concavely arranged towards one side far away from the blanking slide rail (41) in an arc shape so that the blanking channel (44) is in a conical shape with a large inner diameter and a small inner diameter, a plurality of first springs (431) and a plurality of second springs (432) are sequentially arranged between one side far away from the blanking slide rail (41) and the inner wall of the blanking barrel (42) from top to bottom, and the length of the first springs (431) is smaller than that of the second springs (432).

3. The ball circulation lifting device according to claim 1, wherein a side surface of the upper portion of the buffer spring piece (43) close to the blanking slide rail (41) is a rough surface (434), and a side surface of the guide portion (433) close to the blanking slide rail (41) is a smooth surface (435).

4. The ball circulation lifting device according to claim 1, further comprising a receiving device (5), wherein the receiving device (5) comprises a receiving cylinder (51) detachably arranged at the top of the receiving opening (13) and corresponding to the blanking channel (44), the inner diameter of the receiving cylinder (51) is gradually increased from bottom to top, a bucket-shaped flexible sleeve (52) is arranged at the inner side of the receiving cylinder (51), the upper port of the flexible sleeve (52) is detachably arranged with the receiving cylinder (51) and corresponds to the blanking channel (44), and the lower port of the flexible sleeve (52) is suspended and corresponds to the receiving opening (13).

5. A ball circulation lifting device according to claim 4, characterized in that the lower side wall of the flexible sleeve (52) is provided with a plurality of vertically arranged elastic pleats (521), and the lower port of the flexible sleeve (52) is provided with a saw tooth shape.

6. The ball circulation lifting device according to claim 1, further comprising a receiving device (5), wherein the receiving device (5) comprises a receiving cylinder (51) detachably arranged at the top of the receiving opening (13) and corresponding to the blanking channel (44), the inner diameter of the receiving cylinder (51) is gradually increased from bottom to top, a plurality of buffer plates (53) are rotationally arranged at circumferential intervals at the upper port of the receiving cylinder (51), one ends of the buffer plates (53) are arranged to form a plurality of buffer parts (532) transversely arranged at the upper port of the receiving cylinder (51), the buffer parts (532) are surrounded to form a receiving area (54), the other ends of the buffer plates (53) are arranged at the outer side of the receiving cylinder (51) to form a plurality of balance parts (531), when the balls fall down to press one ends of the buffer plates (53), the balance parts (531) are tilted upwards, the receiving area (54) are enlarged to enable the balls to fall into the receiving cylinder (51) to enter the buffer parts (532) to reset, and the balance parts (531) are reset to enable the balance parts (531) to be condensed.

7. The ball circulation lifting device according to claim 1, wherein a connecting port (14) is arranged at the top of the base (1), the spiral sliding rail (2) comprises a plurality of spiral blocks (21), limiting ports (211) are respectively arranged at the upper end and the lower end of each spiral block (21), a plurality of spiral blocks (21) are connected layer by layer through a bolt piece (22) matched with the limiting ports (211), an inserting end (111) matched with the limiting ports (211) is arranged at the top output end of the driving device (11), the lower end of the spiral block (21) at the lowest layer penetrates through the connecting port (14) to be inserted on the inserting end (111) in a limiting mode through the limiting ports (211), and a limiting port (211) at the upper end of the spiral block (21) at the highest layer is connected with a top sealing piece (23) through the bolt piece (22).

8. The ball circulation lifting device according to claim 7, wherein the protruding arc plates (15) that form two intervals that set up in one side top of connector (14), gag lever post (3) are including stopper (32) that a plurality of arcs set up, upper end undercut of stopper (32) forms jack groove (321), the lower part shrink of stopper (32) form with jack groove (321) looks adaptation grafting portion (322), a plurality of between stopper (32) cup joint layer by layer, the grafting portion (322) of stopper (32) of upper strata is inserted and is located in jack groove (321) of stopper (32) of next floor, the grafting portion (322) of stopper (32) of lowest floor is spacing to be inserted and is located two between arc plates (15), blanking slide rail (41) are located one side of stopper (32) of highest floor, the opposite side of stopper (32) of highest floor is equipped with sleeve (33) of cover and locates the outside of sealing member (23), blanking slide rail (41) one end (33) run through behind sleeve (31) intercommunication.