CN111576842A

CN111576842A - Protection device based on building construction possesses security protection mechanism

Info

Publication number: CN111576842A
Application number: CN202010531948.5A
Authority: CN
Inventors: 张守华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2020-08-25

Abstract

The invention provides a protection device with a security mechanism based on building construction, relates to the technical field of building construction, and solves the problems that when an object falls onto a protection net from high altitude, the falling object and a protection net are subjected to hard impact due to no corresponding buffer, so that the protection net is easily damaged by the hard impact; the existing protective net has poor blocking effect on sharp objects such as reinforcing steel bars, and the sharp objects such as the reinforcing steel bars easily pass through meshes of the protective net to continuously fall down, so that the problem of injury to workers is caused. The utility model provides a protector based on construction possesses security protection mechanism, includes the bracket, the regional slidable mounting in bracket has one-level protector. According to the invention, through the arrangement of the limiting mechanism, the bracket is buckled on the scaffold through the U-shaped buckle plate, and the scaffold is limited in the inner end area of the U-shaped buckle plate through the obstruction of the limiting rod in the middle area of the inner end of the U-shaped buckle plate in the limiting mechanism, so that the bracket is prevented from being separated from the scaffold accidentally.

Description

Protection device based on building construction possesses security protection mechanism

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a protection device with a security mechanism based on building construction.

Background

Currently, the construction industry is one of the most dangerous industries. With the increase of high-rise buildings and scaffolds, accidents caused by falling objects from high positions frequently occur; the protective net is erected around the existing scaffold, so that the probability of accidents caused by falling objects at high altitude can be effectively solved or reduced.

For example, application No.: application number 201710745490.1 the invention relates to a construction engineering protective net, belonging to the field of construction equipment. The protective net for the constructional engineering comprises a protective frame, hoop assemblies arranged around the protective frame and a protective net arranged in the protective frame; the protective net comprises a bearing layer, a damping rubber block arranged on the bearing layer, a spring arranged in the damping rubber block, a rubber buffer connected with the spring, and a steel wire mesh layer arranged on the rubber buffer; the steel wire mesh layer comprises steel wires interwoven in a warp and weft mode; and the outer side of the steel wire is wrapped with a polyester fiber layer. The protective net is arranged on the scaffold through the hoop component, and is convenient to disassemble; the bearing layer is arranged to play a role in assisting in buffering impact force when a heavy object falls; the arrangement of the steel wire mesh layer improves the wear resistance of the protective net and has good elasticity.

Based on the retrieval of the patents and the discovery of equipment in the prior art, when an object falls onto the protective net at high altitude, the falling object and the protective net are subjected to rigid impact due to no corresponding buffer, so that the protective net is easily damaged by the rigid impact; the existing protective net has poor blocking effect on sharp objects such as reinforcing steel bars, and the sharp objects such as the reinforcing steel bars easily pass through meshes of the protective net to continuously fall down, so that the injury to workers is caused.

Disclosure of Invention

In order to solve the technical problems, the invention provides a protection device with a security mechanism based on building construction, which aims to solve the problem that when an object falls onto a protection net from high altitude, the falling object and a protection net are subjected to rigid impact due to no corresponding buffer, so that the protection net is easily damaged by the rigid impact; the existing protective net has poor blocking effect on sharp objects such as reinforcing steel bars, and the sharp objects such as the reinforcing steel bars easily pass through meshes of the protective net to continuously fall down, so that the problem of injury to workers is caused.

The invention relates to a protection device with a security mechanism based on building construction, which is achieved by the following specific technical means:

a protection device with a security mechanism based on building construction comprises a bracket, wherein a primary protection device is slidably mounted in the inner area of the bracket; the left side and the right side of the bracket are both connected with a group of limiting mechanisms in a sliding manner; the bottom end of the bracket is fixedly connected with a secondary protection device; the second grade protector is including third rectangle frame board, first rubber protection piece, fourth rectangle frame board, second rubber protection piece, evenly distributed form is provided with one row of first rubber protection piece about personally submitting in third rectangle frame board the inner, third rectangle frame board bottom end face fixedly connected with rather than the fourth rectangle frame board, and the fourth rectangle frame board the inner personally submits about evenly distributed form be provided with one row of second rubber protection piece.

Further, the bracket is including first rectangle frame plate, square spliced pole, U-shaped buckle, spacing through-hole, equal fixedly connected with square spliced pole in first rectangle frame plate bottom face four places edge contained angle position, the first rectangle frame plate top face left and right sides all is two U-shaped buckles of each fixedly connected with of symmetry form around, every the U-shaped buckle all sets up the spacing through-hole that a department is linked together rather than interior terminal surface towards on the outside terminal surface, the regional outside in first rectangle frame plate in U-shaped buckle inner, and U-shaped buckle bottom face and first rectangle frame plate top face are in same horizontal plane.

Further, the bracket is including buffering slide hole, ball, first rectangle frame board left end face and right-hand member face all are around the symmetry form respectively seted up two buffering slide hole, and buffering slide hole is located two U-shaped buckle middle areas, and every buffering slide hole inner peripheral surface adjacent both sides open end position all is the embedded rotation of annular array form and installs four balls.

Furthermore, stop gear is including rectangle strip piece, gag lever post, first reset spring, equal fixedly connected with gag lever post in rectangle strip piece rear end face both sides edge contained angle position, has all cup jointed a first reset spring on every gag lever post, and first reset spring is connected with rectangle strip piece rear end face is fixed, and interval and diameter between two gag lever posts are unanimous with interval and diameter between the spacing through-hole of seting up on two U-shaped buckle with one side.

Furthermore, under the installation state of the limiting mechanism, two limiting rods are respectively inserted into limiting through holes formed in the two U-shaped buckling plates on the same side, a first reset spring sleeved on the limiting rods is fixedly connected with the U-shaped buckling plates, and the limiting rods are located in the middle areas of the inner ends of the U-shaped buckling plates in the ordinary extension state of the first reset spring.

Further, one-level protector is including second rectangle frame board, protection network, wire rope, circular dog, second reset spring, the terminal surface is inlayed and is had a protection network in the second rectangle frame board, two wire rope of each fixedly connected with of symmetry form around second rectangle frame board left end face and the right-hand member face all are, circular dog of the equal fixedly connected with of every wire rope head end, all cup jointed a second reset spring on every wire rope, and second reset spring is connected with circular dog stationary phase.

Further, under the installation state of the primary protection device, two steel wire ropes on the same side are respectively connected in two buffering sliding through holes on the same side in a sliding mode, a second reset spring sleeved on the steel wire ropes is fixedly connected with the outer end face of the first rectangular frame plate, the diameter of each steel wire rope is smaller than that of each buffering sliding through hole, each steel wire rope is in sliding contact with the corresponding ball, the diameter of each circular stop block is larger than that of each buffering sliding through hole, the second rectangular frame plate is located in the inner area of the first rectangular frame plate, and the outer end face of the second rectangular frame plate is not in contact with the inner end face of the first rectangular frame plate in the ordinary extension state of the second reset.

Further, under the second grade protector mounted state, third rectangle frame plate top face is connected with four square spliced pole bottom faces fixedly, first rubber protection piece and second rubber protection piece all are the installation of slope form, and first rubber protection piece and second rubber protection piece all are in the state of tightening, be the distribution of symmetry form between first rubber protection piece and the second rubber protection piece.

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

according to the invention, through the arrangement of the limiting mechanism, the bracket is buckled on the scaffold through the U-shaped buckle plate, and the scaffold is limited in the inner end area of the U-shaped buckle plate through the obstruction of the limiting rod in the middle area of the inner end of the U-shaped buckle plate in the limiting mechanism, so that the bracket is prevented from being separated from the scaffold accidentally.

When an object falls from high altitude onto the primary protection device, the object is in contact with the protective net, the outer end face of the second rectangular frame plate is not in contact with the inner end face of the first rectangular frame plate, so that under the impact of the falling force of the object, the second reset spring is compressed, the steel wire rope slides along the buffering sliding through hole, the primary protection device falls along the inner end of the first rectangular frame plate, the falling force impact force of the object is greatly reduced, the buffering is realized, and the hard impact of the object is avoided.

Bracket bottom fixedly connected with second grade protector, when sharp-pointed object such as reinforcing bar falls in the high altitude and passes the mesh of protection network, sharp-pointed object such as this reinforcing bar will contact with the first rubber protection piece that terminal surface set up in the third rectangle plate, intercept it and even if when sharp-pointed object such as reinforcing bar inserts along the space between two adjacent first rubber protection pieces, influence via first rubber protection piece makes it be the whereabouts of slope form, and all be the installation of slope form because of first rubber protection piece and second rubber protection piece, sharp-pointed object such as reinforcing bar of this slope form whereabouts then can contact with the second rubber protection piece that terminal surface set up in the four rectangle plates, intercept it, thereby sharp-pointed object such as the reinforcing bar of avoiding falling in the high altitude causes the injury to the staff.

Drawings

Fig. 1 is a schematic structural diagram in a split state of the present invention.

Fig. 2 is a schematic front view of the present invention.

Fig. 3 is a bottom end axial view of the bracket of the present invention.

Fig. 4 is a schematic top view of the bracket of the present invention.

FIG. 5 is a schematic cross-sectional view A-A of FIG. 4 according to the present invention.

FIG. 6 is a schematic cross-sectional view B-B of FIG. 4 according to the present invention.

Fig. 7 is a schematic structural diagram of the limiting mechanism of the present invention.

Fig. 8 is a partial structural schematic view of the limiting mechanism of the present invention in a state where the limiting mechanism and the bracket are mounted.

Fig. 9 is a schematic top view of the primary guard of the present invention.

FIG. 10 is a schematic top view of the primary guard of the present invention in an installed state with the bracket.

Fig. 11 is a schematic view, partly in section, of the invention at C in fig. 10.

FIG. 12 is a schematic top view of the secondary guard of the present invention.

Fig. 13 is a schematic cross-sectional view of fig. 12, D-D, according to the present invention.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a bracket; 101. a first rectangular frame plate; 102. a square connecting column; 103. a U-shaped buckle plate; 104. a limiting through hole; 105. a buffer slide through hole; 106. a ball bearing; 2. a limiting mechanism; 201. a rectangular bar; 202. a limiting rod; 203. a first return spring; 3. a primary guard; 301. a second rectangular frame plate; 302. a protective net; 303. a wire rope; 304. a circular stopper; 305. a second return spring; 4. a secondary protective device; 401. a third rectangular frame plate; 402. a first rubber protection sheet; 403. a fourth rectangular frame plate; 404. a second rubber protection sheet;

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in figures 1 to 13:

the invention provides a protection device with a security mechanism based on building construction, which comprises: the device comprises a bracket 1, wherein a primary protection device 3 is slidably arranged in the inner area of the bracket 1; the left side and the right side of the bracket 1 are both connected with a group of limiting mechanisms 2 in a sliding way; the bottom end of the bracket 1 is fixedly connected with a secondary protection device 4; the secondary protection device 4 comprises a third rectangular frame plate 401, first rubber protection pieces 402, a fourth rectangular frame plate 403 and second rubber protection pieces 404, wherein the inner end of the third rectangular frame plate 401 is provided with a row of first rubber protection pieces 402 which are uniformly distributed left and right, the bottom end face of the third rectangular frame plate 401 is fixedly connected with the fourth rectangular frame plate 403, and the inner end of the fourth rectangular frame plate 403 is provided with a row of second rubber protection pieces 404 which are uniformly distributed left and right.

The bracket 1 comprises a first rectangular frame plate 101, square connecting columns 102, U-shaped buckle plates 103 and limiting through holes 104, wherein the square connecting columns 102 are fixedly connected to the edge included angles of the four positions of the bottom end face of the first rectangular frame plate 101, the left side and the right side of the top end face of the first rectangular frame plate 101 are respectively and fixedly connected with two U-shaped buckle plates 103 in a front-back symmetrical mode, each U-shaped buckle plate 103 is provided with one limiting through hole 104 communicated with the inner end face of the U-shaped buckle plate, the inner end area of each U-shaped buckle plate 103 is located on the outer side of the first rectangular frame plate 101, and the bottom end face of each U-shaped buckle plate 103 and the top end face of the first rectangular frame plate 101 are located on.

The bracket 1 comprises a buffering sliding through hole 105 and balls 106, the left end face and the right end face of the first rectangular frame plate 101 are symmetrically provided with two buffering sliding through holes 105, the buffering sliding through holes 105 are located in the middle area of the two U-shaped buckle plates 103, and the opening ends of the two adjacent sides of the inner peripheral surface of each buffering sliding through hole 105 are annularly arrayed and are respectively embedded with four balls 106 in a rotating manner.

The limiting mechanism 2 comprises a rectangular bar 201, limiting rods 202 and first reset springs 203, the limiting rods 202 are fixedly connected to included angles of two side edges of the rear end face of the rectangular bar 201, each limiting rod 202 is sleeved with one first reset spring 203, the first reset springs 203 are fixedly connected with the rear end face of the rectangular bar 201, and the distance and the diameter between the two limiting rods 202 are consistent with the distance and the diameter between the limiting through holes 104 formed in the two U-shaped buckling plates 103 on the same side.

In the installation state of the limiting mechanism 2, two limiting rods 202 are respectively inserted into limiting through holes 104 formed in two U-shaped buckle plates 103 on the same side, a first return spring 203 sleeved on the limiting rods 202 is fixedly connected with the U-shaped buckle plates 103, and the limiting rods 202 are located in the middle areas of the inner ends of the U-shaped buckle plates 103 in the ordinary extension state of the first return spring 203.

Wherein, one-level protector 3 is including second rectangle deckle board 301, protection network 302, wire rope 303, circular dog 304, second reset spring 305, the terminal surface inlays and has a protection network 302 in second rectangle deckle board 301, two wire rope 303 of each fixedly connected with of symmetry form around second rectangle deckle board 301 left end face and the right-hand member face all are, circular dog 304 of the equal fixedly connected with of every wire rope 303 head end, all cup jointed a second reset spring 305 on every wire rope 303, and second reset spring 305 is connected with circular dog 304 is fixed.

Under the installation state of the primary protection device 3, two steel wire ropes 303 on the same side are respectively connected in two buffering sliding through holes 105 on the same side in a sliding manner, a second return spring 305 sleeved on the steel wire ropes 303 is fixedly connected with the outer end face of the first rectangular frame plate 101, the diameter of each steel wire rope 303 is smaller than that of each buffering sliding through hole 105, each steel wire rope 303 is in sliding contact with a ball 106, the diameter of each circular stop block 304 is larger than that of each buffering sliding through hole 105, the second rectangular frame plate 301 is located in the inner area of the first rectangular frame plate 101, and in the ordinary extension state of the second return spring 305, the outer end face of the second rectangular frame plate 301 is not in contact with the inner end face of the first rectangular frame.

Under the installation state of the secondary protection device 4, the top end face of the third rectangular frame plate 401 is fixedly connected with the bottom end faces of the four square connecting columns 102, the first rubber protection sheet 402 and the second rubber protection sheet 404 are installed in an inclined mode, the first rubber protection sheet 402 and the second rubber protection sheet 404 are in a tight state, and the first rubber protection sheet 402 and the second rubber protection sheet 404 are symmetrically distributed.

When in use:

bracket 1 is through the spiral-lock of U-shaped buckle 103 on the scaffold frame, and concrete spiral-lock step is as follows: the rectangular bar block 201 is gripped and pulled outwards, the limiting rod 202 slides outwards along the limiting through hole 104, the first reset spring 203 is stretched, so that the limiting rod 202 does not block the inner end area of the U-shaped buckle plate 103, the U-shaped buckle plate 103 can be buckled on a scaffold, the rectangular bar block 201 can be loosened subsequently, under the rebounding action of the first reset spring 203, the limiting rod 202 slides inwards along the limiting through hole 104 until the limiting rod 202 is located in the middle area of the inner end of the U-shaped buckle plate 103, the scaffold is limited in the inner end area of the U-shaped buckle plate 103, and the bracket 1 is prevented from being accidentally separated from the scaffold;

when an object falls onto the primary protection device 3 at high altitude, the object is in contact with the protective net 302, and because the outer end face of the second rectangular frame plate 301 is not in contact with the inner end face of the first rectangular frame plate 101, under the impact of the falling force of the object, the second reset spring 305 is compressed, and the steel wire rope 303 slides along the buffer sliding through hole 105, so that the primary protection device 3 falls along the inner end of the first rectangular frame plate 101, the impact force of the falling force of the object is greatly reduced, the buffer is realized, and the hard impact of the falling object is avoided; furthermore, four balls 106 are respectively embedded, rotatably and rotatably installed in the annular array shape at the opening ends of two adjacent sides of the inner peripheral surface of each buffering sliding through hole 105, the diameter of the steel wire rope 303 is smaller than that of the buffering sliding through hole 105, and the steel wire rope 303 is in sliding contact with the balls 106, so that the arrangement of the balls 106 is beneficial to the sliding of the steel wire rope 303 along the buffering sliding through hole 105, and the buffering sliding through hole 105 cannot obstruct and influence the sliding of the steel wire rope 303;

the bottom end of the bracket 1 is fixedly connected with a secondary protection device 4, the inner end surface of a third rectangular frame plate 401 is provided with a row of first rubber protection sheets 402 which are uniformly distributed on the left and right, the inner end surface of a fourth rectangular frame plate 403 is provided with a row of second rubber protection sheets 404 which are uniformly distributed on the left and right, the first rubber protection sheets 402 and the second rubber protection sheets 404 are obliquely arranged, the first rubber protection sheets 402 and the second rubber protection sheets 404 are in a tight state, and the first rubber protection sheets 402 and the second rubber protection sheets 404 are symmetrically distributed, so when sharp objects such as reinforcing steel bars fall from high altitude and pass through meshes of the protection net 302, the sharp objects such as the reinforcing steel bars are contacted with the first rubber protection sheets 402 arranged on the inner end surface of the third rectangular frame plate 401 to intercept the sharp objects, and even when the sharp objects such as the reinforcing steel bars are inserted into gaps between the two adjacent first rubber protection sheets 402, the first rubber protection sheet 402 is influenced to fall in an inclined shape, and because the first rubber protection sheet 402 and the second rubber protection sheet 404 are both installed in an inclined shape, as shown in fig. 13, sharp objects such as steel bars falling in an inclined shape can contact with the second rubber protection sheet 404 arranged on the inner end face of the fourth rectangular frame plate 403 to intercept the second rubber protection sheet, so that the injury of the sharp objects such as the steel bars falling in a high altitude to workers is avoided.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a protector based on construction possesses security protection mechanism which characterized in that: the device comprises a bracket (1), wherein a primary protection device (3) is arranged in the inner area of the bracket (1) in a sliding manner; the left side and the right side of the bracket (1) are both connected with a group of limiting mechanisms (2) in a sliding manner; the bottom end of the bracket (1) is fixedly connected with a secondary protection device (4); second grade protector (4) including third rectangle framed panel (401), first rubber protection piece (402), fourth rectangle framed panel (403), second rubber protection piece (404), evenly distributed form is provided with one row of first rubber protection piece (402) about personally submitting in third rectangle framed panel (401), third rectangle framed panel (401) bottom end face fixedly connected with rather than fourth rectangle framed panel (403), and evenly distributed form is provided with one row of second rubber protection piece (404) about personally submitting in fourth rectangle framed panel (403).

2. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: bracket (1) is including first rectangle plate (101), square spliced pole (102), U-shaped buckle (103), spacing through-hole (104), the equal fixedly connected with square spliced pole (102) in edge contained angle position in four places of first rectangle plate (101) bottom face, each two U-shaped buckles (103) of each fixedly connected with of symmetry form around first rectangle plate (101) top face left and right sides all is, every spacing through-hole (104) that a department is linked together rather than interior terminal surface are all seted up towards U-shaped buckle (103) on the outside terminal surface, U-shaped buckle (103) inner regional being located first rectangle plate (101) outside, and U-shaped buckle (103) bottom face and first rectangle plate (101) top face are in same horizontal plane.

3. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: bracket (1) is including buffering slide through hole (105), ball (106), two department buffering slide through hole (105) have respectively been seted up to first rectangle frame board (101) left end face and right-hand member face symmetry form around all being, and buffering slide through hole (105) are located two U-shaped buckle (103) middle areas, and every department buffering slide through hole (105) inner peripheral surface adjacent both sides open end position all is the embedded rotation of annular array form and installs four ball (106).

4. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: stop gear (2) are including rectangle strip piece (201), gag lever post (202), first reset spring (203), equal fixedly connected with gag lever post (202) in rectangle strip piece (201) rear end face both sides edge contained angle position, all cup jointed a first reset spring (203) on every gag lever post (202), and first reset spring (203) is connected with rectangle strip piece (201) rear end face is fixed, and interval and diameter between two gag lever posts (202) are unanimous with interval and diameter between spacing through-hole (104) of seting up on two U-shaped buckle (103) that are in same one side.

5. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: under the installation state of the limiting mechanism (2), two limiting rods (202) are respectively inserted into limiting through holes (104) formed in two U-shaped buckle plates (103) on the same side, a first reset spring (203) sleeved on the limiting rods (202) is fixedly connected with the U-shaped buckle plates (103), and under the ordinary extension state of the first reset spring (203), the limiting rods (202) are located in the middle areas of the inner ends of the U-shaped buckle plates (103).

6. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: one-level protector (3) are including second rectangle deckle board (301), protection network (302), wire rope (303), circular dog (304), second reset spring (305), terminal surface inlays one protection network (302) in second rectangle deckle board (301), two wire rope (303) of each fixedly connected with of symmetry form around second rectangle deckle board (301) left end face and the right-hand member face all are, circular dog (304) of the equal fixedly connected with of every wire rope (303) head end, all cup jointed a second reset spring (305) on every wire rope (303), and second reset spring (305) and circular dog (304) fixed connection.

7. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: under the installation state of the primary protection device (3), two steel wire ropes (303) on the same side are respectively connected in two buffering sliding through holes (105) on the same side in a sliding mode, a second reset spring (305) sleeved on the steel wire ropes (303) is fixedly connected with the outer end face of a first rectangular frame plate (101), the diameter of each steel wire rope (303) is smaller than that of each buffering sliding through hole (105), the steel wire ropes (303) are in sliding contact with balls (106), the diameter of a circular stop block (304) is larger than that of each buffering sliding through hole (105), a second rectangular frame plate (301) is located in the inner area of the first rectangular frame plate (101), and the outer end face of the second rectangular frame plate (301) is not in contact with the inner end face of the first rectangular frame plate (101) in the ordinary extension state of the second reset spring (305).

8. The protection device with a security mechanism based on building construction as claimed in claim 1, wherein: under the installation state of the secondary protection device (4), the top end face of a third rectangular frame plate (401) is fixedly connected with the bottom end faces of four square connecting columns (102), the first rubber protection sheet (402) and the second rubber protection sheet (404) are installed in an inclined mode, the first rubber protection sheet (402) and the second rubber protection sheet (404) are in a tight state, and the first rubber protection sheet (402) and the second rubber protection sheet (404) are symmetrically distributed.