CN211080712U

CN211080712U - Glass curtain wall easy to clean

Info

Publication number: CN211080712U
Application number: CN201921968871.7U
Authority: CN
Inventors: 杜慧; 李富强; 魏庆贵; 罗思敏
Original assignee: Huachuan Construction Group Co ltd
Current assignee: Huachuan Construction Group Co ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-07-24
Anticipated expiration: 2029-11-13

Abstract

The utility model relates to an easy abluent glass curtain wall, including glass curtain wall, glass curtain wall frame all around is located to branch and cover for supporting glass curtain wall, the frame includes underframe and side frame, the waist shape hole has been seted up along its length direction to the side frame, the inside and outside both sides that the side frame was run through in the waist shape hole, waist shape hole slides and is provided with the slider, the slider slides along the length direction in waist shape hole, the slider passes waist shape hole, and stretch out the inside and outside both sides of side frame, connect through the connecting rod between two sliders, the connecting rod is located the glass curtain wall outside, connecting rod outside cover is equipped with the cleaning roller that is used for cleaning glass curtain wall. The utility model has the advantages that: the utility model discloses can be comparatively convenient clean glass curtain wall, and easy operation.

Description

Glass curtain wall easy to clean

Technical Field

The utility model belongs to the glass curtain wall field especially relates to an easy abluent glass curtain wall.

Background

The glass curtain wall is a building external protective structure or a decorative structure which has a certain displacement capacity relative to the main structure by a supporting structure system and does not bear the action of the main structure. The glass curtain wall is a modern new wall body, and the greatest characteristic of the glass curtain wall endows the building with the characteristics of organically unifying factors such as building aesthetics, building functions, building energy conservation, building structures and the like, so that the building presents different tones from different angles, and gives dynamic beauty to people along with the change of sunlight, moonlight and lamplight.

Chinese patent with publication number CN207582753U discloses a glass curtain wall system with adjustable angle, including the glass curtain wall, a branch for supporting the glass curtain wall, glass curtain wall frame all around is located to the cover, still including the cleaning roller that is used for clean glass curtain wall lateral surface dust, and the cleaning roller cover is located and is used for driving the connecting axle that the cleaning roller straight line slided in order to realize clean glass curtain wall dust, the glass curtain wall is close to indoor one side and is provided with the first guide strip that is used for guiding the connecting axle straight line to slide, and the connecting axle is perpendicular setting with first guide strip, first guide strip is parallel arrangement with one of them side of frame.

The above technical solution has the following disadvantages: when the in-process that the cleaning roller removed meets branch, need break away from the sliding block in the groove that slides and realize that the connecting axle breaks away from in glass curtain wall, then stride across branch, again with the sliding block embedding in the groove that slides, continue to clean glass curtain wall, but, when needs clean glass curtain wall, all need accomplish above-mentioned operation, it is comparatively troublesome to operate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an easy abluent glass curtain wall, can be comparatively convenient clean glass curtain wall, and easy operation.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides an easy abluent glass curtain wall, includes glass curtain wall, is used for supporting glass curtain wall's branch and cover and locates glass curtain wall frame all around, the frame includes underframe and side frame, the side frame has seted up waist shape hole along its length direction, waist shape hole runs through the inside and outside both sides of side frame, waist shape hole slip is provided with the slider, the slider is followed the length direction in waist shape hole slides, the slider passes waist shape hole, and stretch out the inside and outside both sides of side frame, two connect through the connecting rod between the slider, the connecting rod is located the glass curtain wall outside, connecting rod outside cover is equipped with and is used for the cleanness glass curtain wall's cleaning roller.

Through adopting above-mentioned technical scheme, slide the slider along waist shape hole, the slider drives connecting rod and cleaning roller and removes along glass curtain wall, and cleaning roller and glass curtain wall butt, when connecting rod and cleaning roller remove, because there is frictional force in cleaning roller and glass curtain wall surface, make cleaning roller laminating glass curtain wall, and roll along glass curtain wall surface, thereby play the effect of clean glass curtain wall, and when removing the slider, in the migration range of slider, can not be blocked the movement path of slider by branch, thereby comparatively convenient cleans the whole glass curtain wall outside.

The utility model discloses further set up to: the sliding piece comprises an inner sliding plate, a sliding rod and an outer sliding plate, two ends of the sliding rod are respectively connected with the inner sliding plate and the outer sliding plate, the sliding rod penetrates through the waist-shaped hole and is in sliding connection with the sliding rod, the outer side wall of the sliding rod is abutted to two opposite side walls of the waist-shaped hole, the inner sliding plate is abutted to the inner side of the side frame, and the outer sliding plate is abutted to the outer side of the side frame.

Through adopting above-mentioned technical scheme, the setting of interior sliding plate and outer sliding plate can play certain limiting displacement to the slide bar, makes the cleaning roller tight with the outside laminating of glass curtain wall.

The utility model discloses further set up to: the bottom of the inner side of the bottom frame is provided with a bearing plate, the bearing plate is rotationally connected with a handle and a transmission shaft, the axes of the handle and the transmission shaft are both parallel to the plane of the bearing plate, the axis of the handle is vertical to the axis of the transmission shaft, the handle is provided with a first bevel gear, the transmission shaft is provided with a second bevel gear driven by the first bevel gear, the first bevel gear is meshed with the second bevel gear, the transmission shaft is provided with a third bevel gear, the inner side of the side frame is rotatably connected with a screw rod, the axis of the screw rod is parallel to the plane of the side frame, the axis of the screw rod is vertical to the axis of the transmission shaft, the screw rod is provided with a fourth bevel gear driven by the third bevel gear, the third bevel gear is meshed with the fourth bevel gear, the screw rod is in threaded connection with a first connecting plate, and the first connecting plate is connected with the inner sliding plate.

Through adopting above-mentioned technical scheme, first bevel gear and second bevel gear meshing, when the twist grip, first bevel gear drives second bevel gear, thereby it rotates to drive the transmission shaft, third bevel gear and fourth bevel gear meshing, when the transmission shaft rotates, third bevel gear drives fourth bevel gear, thereby it rotates to drive the lead screw, when the lead screw rotates, the lead screw drives first connecting plate and removes along the axis of lead screw, thereby drive connecting rod and cleaning roller and remove, only need twist grip just can realize glass curtain's cleanness, this operation is comparatively simple.

The utility model discloses further set up to: the side frame is inboard to have seted up the arc wall along its length direction, the arc wall is located the both sides in waist shape hole, interior slide plate is close to one side of slide bar be provided with the arc piece that the arc wall corresponds, the arc piece is located the both sides of slide bar, the arc piece with arc wall sliding connection.

Through adopting above-mentioned technical scheme, the setting of arc wall and arc piece can play certain limiting displacement to first connecting plate and interior slide.

The utility model discloses further set up to: the inner sliding plate is provided with a first screw in a penetrating mode, and the first screw penetrates through the inner sliding plate and is fixedly connected with the sliding rod.

Through adopting above-mentioned technical scheme, the detachable of interior sliding plate and slide bar is connected can be realized to the setting of first screw, pulls down first screw from interior sliding plate, makes interior sliding plate and slide bar separation, alright take off outer sliding plate and connecting rod together.

The utility model discloses further set up to: and one side of the outer sliding plate, which is far away from the sliding rod, is connected with a second connecting plate, the second connecting plate is perpendicular to the outer sliding plate, a second screw penetrates through the second connecting plate, and the second screw penetrates through the second connecting plate and is fixedly connected with the connecting rod.

Through adopting above-mentioned technical scheme, the detachable of second connecting plate and connecting rod can be realized being connected in the setting of second screw, pulls down the second screw from the second connecting plate, makes second connecting plate and connecting rod separation, alright take off the cleaning roller from the connecting rod, is convenient for change the cleaning roller.

The utility model discloses further set up to: the inner side of the side frame is provided with an upper limiting plate for limiting the moving distance of the first connecting plate, the screw rod penetrates through the upper limiting plate and is rotatably connected with the upper limiting plate, the upper limiting plate is located above the first connecting plate, and the bottom surface of the upper limiting plate is parallel to the top surface of the first connecting plate.

Through adopting above-mentioned technical scheme, go up the setting of spacing board and can restrict the displacement of first connecting plate to the displacement of restriction connecting rod and cleaning roller plays certain guard action to the cleaning roller.

The utility model discloses further set up to: the side frame inboard is provided with the restriction first connecting plate displacement's lower limiting plate, lower limiting plate is located first connecting plate below, first connecting plate is located go up the limiting plate with between the limiting plate, lower limiting plate surface with first connecting plate bottom surface is parallel.

Through adopting above-mentioned technical scheme, the setting of lower limiting plate can spacing first connecting plate's displacement to restricted the displacement of connecting rod and cleaning roller, played certain guard action to the cleaning roller, can also prevent first connecting plate and fourth bevel gear contact.

To sum up, the utility model discloses a beneficial technological effect does:

1. slide the slider along waist shape hole, the slider drives connecting rod and cleaning roller and removes along glass curtain wall, and cleaning roller and glass curtain wall butt, when connecting rod and cleaning roller remove, because there is frictional force in cleaning roller and glass curtain wall surface, make cleaning roller laminating glass curtain wall, and roll along glass curtain wall surface, thereby play the effect of clean glass curtain wall, and when removing the slider, in the moving range of slider, can not be blocked the moving route of slider by branch, thereby comparatively convenient cleans the whole glass curtain wall outside.

2. The handle is rotated to drive the transmission shaft to rotate, so that the screw rod is driven to rotate, the screw rod drives the connecting rod and the cleaning roller to lift, so that the glass curtain wall is cleaned, and the operation is simple; the first screw can realize the detachable connection of the inner sliding plate and the sliding rod; the second connecting plate can be detachably connected with the connecting rod through the second screws, and the cleaning roller is convenient to replace.

Drawings

FIG. 1 is a schematic view of an easily cleanable glass curtain wall;

FIG. 2 is a schematic view of another angle of the easy-to-clean glass curtain wall;

FIG. 3 is a schematic view of the slide and the cleaning roller of the glass curtain wall easy to clean;

FIG. 4 is an enlarged partial schematic view of portion A of FIG. 2;

FIG. 5 is an enlarged partial schematic view of portion B of FIG. 2;

fig. 6 is a partially enlarged schematic view of a portion C in fig. 2.

In the figure, 1, a glass curtain wall; 2. a strut; 3. a frame; 4. a bottom frame; 5. a side frame; 6. a slider; 7. a connecting rod; 8. a cleaning roller; 9. a waist-shaped hole; 10. a slide bar; 11. an inner sliding plate; 12. an outer sliding plate; 13. an arc-shaped slot; 14. an arc-shaped block; 15. a second connecting plate; 16. a first screw; 17. a second screw; 18. a bearing plate; 19. a handle; 20. a drive shaft; 21. a first bevel gear; 22. a second bevel gear; 23. a top plate; 24. a screw rod; 25. a third bevel gear; 26. a fourth bevel gear; 27. a first connecting plate; 28. an upper limiting plate; 29. a lower limiting plate; 30. and a screw hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses an easy abluent glass curtain wall, locate glass curtain wall 1 frame 3 all around including glass curtain wall 1, the branch 2 that is used for supporting glass curtain wall 1 and cover. The frame 3 comprises a bottom frame 4 and side frames 5, the side frames 5 are positioned on two sides of the glass curtain wall 1, and the bottom frame 4 is positioned at the bottom of the glass curtain wall 1. Two sets of side frames 5 all are provided with slider 6, connect through connecting rod 7 between two sets of sliders 6, and connecting rod 7 is provided with cleaning roller 8 that is used for cleaning glass curtain wall 1.

Referring to fig. 2 and 3, the two sets of side frames 5 are both provided with waist-shaped holes 9 along the length direction thereof, and the waist-shaped holes 9 penetrate through the inner side and the outer side of the side frames 5. The sliding part 6 comprises a sliding rod 10, an inner sliding plate 11 and an outer sliding plate 12, the inner sliding plate 11 and the outer sliding plate 12 are connected to two ends of the sliding rod 10, the sliding rod 10 penetrates through the kidney-shaped hole 9 and is in sliding connection with the kidney-shaped hole 9, and the sliding rod 10 can slide along the length direction of the kidney-shaped hole 9. Two end faces of the sliding rod 10 are respectively flush with the inner side and the outer side of the side frame 5, after the sliding rod 10 penetrates through the kidney-shaped hole 9, the outer side wall of the sliding rod 10 is abutted against the two opposite side walls of the kidney-shaped hole 9, one side, close to the sliding rod 10, of the inner sliding plate 11 is abutted against the inner side of the side frame 5, and one side, close to the sliding rod 10, of the outer sliding plate 12 is abutted against the outer side of the.

One side of the outer sliding plate 12, which is far away from the sliding rod 10, is fixedly connected with a second connecting plate 15, one side of the second connecting plate 15, which is far away from the outer sliding plate 12, is fixedly connected with the end face of the connecting rod 7, the connecting rod 7 is positioned on the outer side of the glass curtain wall 1, the other end face of the connecting rod 7 is fixedly connected with the other second connecting plate 15, and the cleaning roller 8 is sleeved on the outer side of the connecting rod 7.

Referring to fig. 3, a first screw 16 is arranged through the inner sliding plate 11, and the first screw 16 passes through the inner side of the sliding plate and is fixedly connected with the end surface of the sliding rod 10 through a thread. The second connecting plate 15 is provided with a second screw 17 in a penetrating way, and the second screw 17 penetrates through the second connecting plate 15 and is fixedly connected with the end face of the connecting rod 7 through threads.

Referring to fig. 4, two sets of arc-shaped grooves 13 are formed in the inner side of the side frame 5 along the length direction of the side frame, the two sets of arc-shaped grooves 13 are parallel to each other, the two sets of arc-shaped grooves 13 are located on two sides of the waist-shaped hole 9, and the length direction of the arc-shaped grooves 13 is parallel to the length direction of the waist-shaped hole 9. One side of the inner sliding plate 11 close to the sliding rod 10 is fixedly connected with arc-shaped blocks 14 corresponding to the arc-shaped grooves 13, the two groups of arc-shaped blocks 14 are parallel to each other, and the two groups of arc-shaped blocks 14 are positioned at two sides of the sliding rod 10. Two opposite side walls of the arc-shaped block 14 are abutted against two opposite side walls of the arc-shaped groove 13, and the arc-shaped block 14 can slide along the length direction of the arc-shaped groove 13.

Referring to fig. 2 and 3, when the sliding rod 10 moves along the length direction of the slotted hole 9, the connecting rod 7 and the cleaning roller 8 sleeved outside the connecting rod 7 also move along with the connecting rod, and the cleaning roller 8 is attached to the glass curtain wall 1 and rolls along the surface of the glass curtain wall 1 due to the friction between the cleaning roller 8 and the surface of the glass curtain wall 1, so that the effect of cleaning the glass curtain wall 1 is achieved.

Referring to fig. 2 and 5, a receiving plate 18 is fixedly connected to the bottom of the inner side of the bottom frame 4, and the receiving plate 18 is horizontally disposed. The bearing plate 18 is rotatably connected with a handle 19 and a transmission shaft 20, the axes of the handle 19 and the transmission shaft 20 are parallel to the plane of the bearing plate 18, the axis of the handle 19 is perpendicular to the axis of the transmission shaft 20, and the axis of the transmission shaft 20 is parallel to the length direction of the bearing plate 18. A first bevel gear 21 is fixedly connected to the outer side of the handle 19 close to the transmission shaft 20, a second bevel gear 22 corresponding to the first bevel gear 21 is fixedly connected to the outer side of the transmission shaft 20 close to the handle 19, and the first bevel gear 21 is meshed with the second bevel gear 22.

Referring to fig. 2 and 6, a top plate 23 is fixedly connected to the top of the inner side of the side frame 5, a screw rod 24 is rotatably connected to the inner side of the side frame 5, two ends of the screw rod 24 are rotatably connected to the bearing plate 18 and the top plate 23, respectively, the axis of the screw rod 24 is parallel to the length direction of the side frame 5, and the axis of the screw rod 24 is perpendicular to the axis of the transmission shaft 20. A third bevel gear 25 is fixedly connected to the outer side of the transmission shaft 20 far away from the second bevel gear 22, a fourth bevel gear 26 corresponding to the third bevel gear 25 is fixedly connected to the outer side of the screw rod 24 near the transmission shaft 20, and the third bevel gear 25 is meshed with the fourth bevel gear 26.

Referring to fig. 2 and 3, two sets of first connecting plates 27 parallel to each other are fixedly connected to a side of the inner sliding plate 11 away from the sliding rod 10, the two sets of first connecting plates 27 are respectively connected to the top and the bottom of the inner sliding plate 11, and both the two sets of first connecting plates 27 are perpendicular to the inner sliding plate 11. Screw holes 30 with the same thread direction as the screw rods 24 are formed in the same positions of the two groups of first connecting plates 27, and the screw rods 24 penetrate through the two groups of first connecting plates 27 and are in threaded connection with the screw holes 30.

Referring to fig. 5 and 6, when the handle 19 is rotated, the first bevel gear 21 can drive the second bevel gear 22 to rotate, the second bevel gear 22 can drive the transmission shaft 20 and the third bevel gear 25 to rotate together, the third bevel gear 25 drives the fourth bevel gear 26 and the screw rod 24 to rotate together, the screw rod 24 can drive the first connecting plate 27 (refer to fig. 3) to ascend and descend, the first connecting plate 27 (refer to fig. 3) can drive the connecting rod 7 (refer to fig. 3) to ascend and descend, and the cleaning roller 8 (refer to fig. 3) can clean the surface of the glass curtain wall 1 (refer to fig. 2).

Referring to fig. 2 and 3, an upper limit plate 28 and a lower limit plate 29 for limiting the moving distance of the first link plate 27 are fixedly connected to the inner side of the side frame 5, the upper limit plate 28 and the lower limit plate 29 are both located between the fourth bevel gear 26 (see fig. 6) and the top plate 23, the upper limit plate 28 is located above the lower limit plate 29, the first link plate 27 is located between the upper limit plate 28 and the lower limit plate 29, the bottom surface of the upper limit plate 28 is parallel to the surface of the first link plate 27, and the surface of the lower limit plate 29 is parallel to the bottom surface of the first link plate 27. The screw rod 24 penetrates through the upper limiting plate 28 and is rotatably connected with the upper limiting plate 28, and the screw rod 24 penetrates through the lower limiting plate 29 and is rotatably connected with the lower limiting plate 29.

When the first link plate 27 is raised, the first link plate 27 on the upper portion of the inner slide plate 11 comes closer to the upper stopper plate 28, and eventually the first link plate 27 comes into abutment with the upper stopper plate 28. When the first connecting plate 27 descends, the first connecting plate 27 at the lower part of the inner sliding plate 11 gradually approaches the lower limiting plate 29, finally, the first connecting plate 27 will abut against the lower limiting plate 29, and the arrangement of the upper limiting plate 28 and the lower limiting plate 29 plays a role in limiting the moving distance of the first connecting plate 27, thereby playing a certain role in protecting the cleaning roller 8.

The implementation principle of the embodiment is as follows: when the surface of the glass curtain wall 1 needs to be cleaned, the handle 19 is rotated, at the moment, the cleaning roller 8 is located at the bottom of the glass curtain wall 1, the first bevel gear 21 can drive the second bevel gear 22 to rotate, the second bevel gear 22 drives the transmission shaft 20 and the third bevel gear 25 to rotate together, the third bevel gear 25 drives the fourth bevel gear 26 and the screw rod 24 to rotate together, the screw rod 24 rotates to drive the first connecting plate 27 to lift, the first connecting plate 27 can lift to drive the connecting rod 7 to lift, so that the cleaning roller 8 cleans the surface of the glass curtain wall 1, when the cleaning work is completed, the cleaning roller 8 is moved to the bottom of the glass curtain wall 1, and the cleaning roller 8 and the connecting rod 7 are prevented from blocking the glass curtain wall 1.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. An easy-to-clean glass curtain wall comprises a glass curtain wall (1), a support rod (2) for supporting the glass curtain wall (1) and a frame (3) sleeved on the periphery of the glass curtain wall (1), wherein the frame (3) comprises a bottom frame (4) and side frames (5); the method is characterized in that: waist shape hole (9) have been seted up along its length direction in side frame (5), waist shape hole (9) run through the inside and outside both sides of side frame (5), waist shape hole (9) slide and are provided with slider (6), slider (6) are followed the length direction in waist shape hole (9) slides, slider (6) are passed waist shape hole (9), and stretch out the inside and outside both sides of side frame (5), two connect through connecting rod (7) between slider (6), connecting rod (7) are located glass curtain (1) outside, connecting rod (7) outside cover is equipped with and is used for the cleanness cleaning roller (8) of glass curtain (1).

2. An easily cleaned glass curtain wall as claimed in claim 1, wherein: the sliding piece (6) comprises an inner sliding plate (11), a sliding rod (10) and an outer sliding plate (12), two ends of the sliding rod (10) are respectively connected with the inner sliding plate (11) and the outer sliding plate (12), the sliding rod (10) penetrates through the waist-shaped hole (9) and is in sliding connection with the sliding rod (10), the outer side wall of the sliding rod (10) is abutted to two opposite side walls of the waist-shaped hole (9), the inner sliding plate (11) is abutted to the inner side of the side frame (5), and the outer sliding plate (12) is abutted to the outer side of the side frame (5).

3. An easily cleaned glass curtain wall as claimed in claim 2, wherein: the bottom of the inner side of the bottom frame (4) is provided with a bearing plate (18), the bearing plate (18) is rotatably connected with a handle (19) and a transmission shaft (20), the axes of the handle (19) and the transmission shaft (20) are parallel to the plane of the bearing plate (18), the axis of the handle (19) is perpendicular to the axis of the transmission shaft (20), the handle (19) is provided with a first bevel gear (21), the transmission shaft (20) is provided with a second bevel gear (22) driven by the first bevel gear (21), the first bevel gear (21) is meshed with the second bevel gear (22), the transmission shaft (20) is provided with a third bevel gear (25), the inner side of the side frame (5) is rotatably connected with a screw rod (24), the axis of the screw rod (24) is parallel to the plane of the side frame (5), and the axis of the screw rod (24) is perpendicular to the axis of the transmission shaft (20), the screw rod (24) is provided with a fourth bevel gear (26) driven by the third bevel gear (25), the third bevel gear (25) is meshed with the fourth bevel gear (26), the screw rod (24) is in threaded connection with a first connecting plate (27), and the first connecting plate (27) is connected with the inner sliding plate (11).

4. An easily cleaned glass curtain wall as claimed in claim 2, wherein: an arc-shaped groove (13) is formed in the inner side of the side frame (5) along the length direction of the side frame, the arc-shaped grooves (13) are located on two sides of the waist-shaped hole (9), an arc-shaped block (14) corresponding to the arc-shaped groove (13) is arranged on one side, close to the sliding rod (10), of the inner sliding plate (11), the arc-shaped block (14) is located on two sides of the sliding rod (10), and the arc-shaped block (14) is connected with the arc-shaped grooves (13) in a sliding mode.

5. An easily cleaned glass curtain wall as claimed in claim 2, wherein: a first screw (16) penetrates through the inner sliding plate (11), and the first screw (16) penetrates through the inner sliding plate (11) and is fixedly connected with the sliding rod (10).

6. An easily cleaned glass curtain wall as claimed in claim 2, wherein: one side, far away from the sliding rod (10), of the outer sliding plate (12) is connected with a second connecting plate (15), the second connecting plate (15) is perpendicular to the outer sliding plate (12), a second screw (17) penetrates through the second connecting plate (15), and the second screw (17) penetrates through the second connecting plate (15) and is fixedly connected with the connecting rod (7).

7. An easily cleaned glass curtain wall as claimed in claim 3, wherein: the inner side of the side frame (5) is provided with an upper limiting plate (28) for limiting the moving distance of the first connecting plate (27), the screw rod (24) penetrates through the upper limiting plate (28) and is rotationally connected with the upper limiting plate (28), the upper limiting plate (28) is located above the first connecting plate (27), and the bottom surface of the upper limiting plate (28) is parallel to the top surface of the first connecting plate (27).

8. An easily cleaned glass curtain wall as claimed in claim 7, wherein: the inner side of the side frame (5) is provided with a lower limiting plate (29) for limiting the moving distance of the first connecting plate (27), the lower limiting plate (29) is positioned below the first connecting plate (27), the first connecting plate (27) is positioned between the upper limiting plate (28) and the lower limiting plate (29), and the surface of the lower limiting plate (29) is parallel to the bottom surface of the first connecting plate (27).