CN113503089A

CN113503089A - Guardrail device

Info

Publication number: CN113503089A
Application number: CN202110963431.8A
Authority: CN
Inventors: 马浩源
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2021-10-15

Abstract

The invention provides a guardrail device and relates to the technical field of building safety protection. Including a plurality of guardrail units of splicing each other, every guardrail unit all includes a plurality of stand, installs silk screen skeleton and mounting on the stand, and the mounting is used for fixed silk screen skeleton. According to the technical scheme, a plurality of mutually spliced guardrail units can be freely rotated by a user, the number of the guardrail units suitable for the user needs is selected, and waste of materials is avoided; and the stand that sets up in every guardrail unit can provide necessary support for the silk screen skeleton, avoids the silk screen skeleton to provide stable support when accepting separation and decoration effect, aims at solving general guardrail and has rocking, unstable problem after the installation, improves road guardrail's sight and utilizability with the afforestation area is few, and the separation structure that the silk screen skeleton that sets up formed through special weaving technology, does not have any welding seam fracture after long-time use, and it carries out surface antiseptic treatment, long service life.

Description

Guardrail device

Technical Field

The invention relates to the technical field of building safety protection, in particular to a guardrail device.

Background

The guardrail mainly plays a role in protecting and isolating personal safety and equipment facilities in occasions such as roads, commercial districts, public places and the like. At present, the railing all is vertical setting in the structure of guardrail, and the upper and lower both ends of railing are connected respectively and are realized protection, isolation on last horizontal pole and sheer pole, and the shape change mode of pole setting is monotonous repeated, and the structure is single, and lacks the sight to the guardrail has the drawback of rocking and warping after the installation.

Meanwhile, the number of the used railings is large, the cost is high, the integral stabilizing part is poor, and the construction safety requirement is difficult to meet due to the defect of the edge protection guardrail module rod; because the guard rail module rods are integrally connected, when the local guard rail module rods need to be changed, the guard rail module rods can be disconnected in a gas cutting mode, so that the flexibility is poor, and the construction progress is influenced; the pipes are different in length, need to be cut open, are large in material loss amount and are not convenient to carry; the used pipes and fasteners have large quantity and high cost; the pipe upright stanchion has open fire operation in the welding process, discharges harmful gas and has certain influence on the environment.

Disclosure of Invention

The invention aims to provide a guardrail device which can increase the structural strength of a guardrail through modular design, meet construction requirements during construction and reduce the damage to the environment during installation.

The embodiment of the invention is realized by the following steps:

the embodiment of the application provides a guardrail device, including a plurality of guardrail units of splicing each other, every guardrail unit all includes a plurality of stand, installs the silk screen skeleton on the stand, installs the mounting that is used for fixed silk screen skeleton on the stand.

In some embodiments of the invention, the wire mesh skeleton comprises two fixed meshes and a plurality of wire mesh pieces positioned between the two fixed meshes; two fixed nets all are connected with the silk screen spare, and the piece is all installed to the both ends of fixed net and is reinforceed.

In some embodiments of the present invention, the fixing net includes a plurality of first wires and a plurality of second wires, and any one of the first wires is connected to any one of the second wires after being vertically crossed.

In some embodiments of the invention, the wire mesh member is a third wire that is wavy and extends continuously, and the folded end of the third wire is connected to either the first wire or the second wire.

In some embodiments of the present invention, a plurality of third wires are disposed between the two fixing nets at equal intervals in a height direction of the fixing nets.

In some embodiments of the invention, the first wire, the second wire, and the third wire each have a diameter greater than or equal to 2.5 mm.

In some embodiments of the invention, the spatial area of the lattice formed by any first wire and any second wire adjacent thereto is less than 100 square centimeters.

In some embodiments of the invention, a stabilizing member is provided within the upright for securing it to the ground.

In some embodiments of the present invention, the fixing member includes a screw rod inserted into the upright, the screw rod is sleeved with a plurality of nuts in threaded fit therewith, and one end of the screw rod close to the ground is detachably provided with a ground inserting nail.

In some embodiments of the present invention, a gear engaged with the screw rod is rotatably disposed in the upright column, a through hole is disposed on a side wall of the upright column, a C-shaped locking rod is disposed in the through hole, and a toothed belt engaged with the gear is disposed on the locking rod.

Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:

the embodiment of the application provides a guardrail device, including a plurality of guardrail units of splicing each other, every guardrail unit all includes a plurality of stand, installs the silk screen skeleton on arbitrary stand, installs the mounting that is used for fixed silk screen skeleton on the stand. According to the technical scheme, a plurality of guardrail units which are spliced mutually can be freely rotated by a user, so that the number of the guardrail units which are suitable for the user to need is selected, and the waste of materials is avoided; and the stand that sets up in every guardrail unit can provide necessary support for the silk screen skeleton, avoid the silk screen skeleton when accepting separation and decoration effect, provide stable support, avoid the silk screen skeleton to appear the possibility of warping in long-time use, and the silk screen skeleton of setting passes through the separation structure that special weaving technology formed, and silk screen skeleton in the time of manufacturing through the intensive design after, no any welding seam fracture after long-time use, and carry out surface corrosion protection to it, long service life, the surface is bright for different plants and surrounding environment customization colour customization panel size and shape, unique design environmental protection, more is fit for the plant climbing. The environment is not polluted, the surrounding environment is improved, and the vertical greening, wall greening, roof greening and road greening can be performed, and the mounting modes are diversified. Can be in the city building wall body cooperation climbing plant installation, increase urban afforestation area, the vegetation is through absorbing carbon oxide, pollution particle and emission clean and cooling air, and the facade covers the wall, prevents to scribble. Noise abatement on the busy street of traffic increases the area of the sunshade of road both sides, and driver's visual fatigue also can be alleviated to the afforestation rail, and the protectiveness of structure is higher than general road. The panel can be the field regulation design, and the fixed shaping of flexible, the shape becomes the commonality high, and the design effect is diversified, and its three-dimensional spatial structure more can promote visual effect's third dimension. The structural specificity is fully utilized, the visual effect of three-dimensional sense is achieved, and the appearance is attractive. The overall structure realizes high energy-saving structural layout on the spatial structure.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic cross-sectional view of the column of the present invention.

Icon: 1. a column; 2. a reinforcement; 3. a first wire; 4. a reverse-U-shaped buckle; 5. a screw rod; 6. a nut; 7. a lock lever; 8. a gear; 9. inserting a ground nail; 10. a third wire; 11. a second wire.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the orientations or positional relationships are only used for convenience of describing the present invention and simplifying the description, but the terms do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "a plurality" represents at least 2.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Examples

Referring to fig. 1-3, fig. 1 is a schematic front view of the present invention; FIG. 2 is a schematic top view of the present invention; fig. 3 is a schematic sectional structure view of the column 1 in the embodiment of the present invention.

The embodiment of the application provides a guardrail device, including a plurality of guardrail units of splicing each other, every guardrail unit all includes a plurality of stand 1, installs the silk screen skeleton on the stand 1, installs the mounting that is used for fixed silk screen skeleton on the stand 1. According to the technical scheme, a plurality of guardrail units which are spliced mutually can be freely rotated by a user, so that the number of the guardrail units which are suitable for the user to need is selected, and the waste of materials is avoided; and the stand 1 that sets up in every guardrail unit can provide necessary support for the silk screen skeleton, avoid the silk screen skeleton when accepting separation and decoration effect, provide stable support, avoid the silk screen skeleton to appear the possibility of warping in long-time use, and the silk screen skeleton that sets up passes through the separation structure that special weaving technology formed, and silk screen skeleton in the time of manufacturing is after the intensive design, there is not any welding seam fracture after long-time use, and carry out surface corrosion protection to it, long service life, the surface is bright for different plants and the customization colour customization panel size and shape of surrounding environment, unique design environmental protection, more be fit for the plant climbing. The environment is not polluted, the surrounding environment is improved, and vertical greening, wall greening, roof greening and road greening can be performed, and the installation mode is diversified. Can be in the city building wall body cooperation climbing plant installation, increase urban afforestation area, the vegetation is through absorbing carbon oxide, pollution particle and emission clean and cooling air, and the facade covers the wall, prevents to scribble. Noise abatement on the busy street of traffic increases the area of the sunshade of road both sides, and driver's visual fatigue also can be alleviated to the afforestation rail, and the protectiveness of structure is higher than general road. The panel can be the field regulation design, and the fixed shaping of flexible, the shape becomes the commonality high, and the design effect is diversified, and its three-dimensional spatial structure more can promote visual effect's third dimension. The structural specificity is fully utilized, the visual effect of three-dimensional sense is achieved, and the appearance is attractive. The overall structure realizes high energy-saving structural layout on the spatial structure.

Further, the fixing piece is a reverse U-shaped buckle 4 or

Combined fastener and fittings of L shape

The reverse-U-shaped buckle 4 and the reverse-U-shaped buckle 4 are combined and then are arranged on the wall by an expansion bolt; and is completely and firmly attached to the wall and then is installed on the wall.

Furthermore, the upright post 1 is a round or square galvanized steel pipe, the U-shaped buckle 4 is needed when the upright post 1 is installed with the three-dimensional net rack, and a shock pad is arranged in the U-shaped buckle 4 and then is installed on the upright post 1 by bolts. Galvanized steel pipes are classified into cold galvanized steel pipes and hot galvanized steel pipes, the cold galvanized steel pipes are forbidden, and the cold galvanized steel pipes are advocated by the state to be temporarily used. A hexa-hot galvanized pipe is a pipe in which molten metal reacts with an iron substrate to produce an alloy layer, thereby bonding both the substrate and the coating. The hot dip galvanizing is to pickle the steel pipe, to remove iron oxide on the surface of the steel pipe, and then to wash the steel pipe in an ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then to send the steel pipe into a hot dip galvanizing bath. The hot galvanizing has the advantages of uniform plating, strong adhesive force, long service life and the like. The hot dip galvanized steel pipe matrix and the molten plating solution have complex physical and chemical reactions to form a corrosion-resistant zinc-iron alloy layer with a compact structure. The alloy layer is integrated with the pure zinc layer and the steel pipe base body, so that the galvanized steel pipe with high corrosion resistance has a hot dip galvanized or electro-galvanized layer on the surface. The galvanization can improve the corrosion resistance of the steel pipe and prolong the service life. The galvanized pipe has wide application, and can be used as a pipeline outside a common low-pressure fluid such as water, gas, oil and the like, an oil well pipe and an oil delivery pipe of the petroleum industry, particularly an offshore oil field, an oil heater, a condenser cooler and a pipe for a coal distillation and washing oil exchanger of chemical coking equipment, a trestle pipe pile, a support frame pipe of a mine tunnel and the like.

Further, the stand column 1 is divided into an independent stand column 1 and a stand column 1 with a base, when the independent stand column 1 is used, the pre-buried depth is required to be more than or equal to 30cm in the installation process, and the stand column 1 with the base is required to be fixed on the ground by using expansion screws.

In some embodiments of the invention, the wire mesh skeleton comprises two fixed meshes and a plurality of wire mesh pieces positioned between the two fixed meshes; two fixed nets all are connected with the silk screen spare, and the both ends of fixed net all install and reinforce piece 2. The silk screen skeleton that constitutes through two fixed nets and the silk screen that is located between the fixed net can increase silk screen skeleton rigidity as a whole, and two fixed nets all are connected with the silk screen spare, can provide a plurality of tie points and stress point to silk screen spare and two fixed nets in the space, makes two fixed nets and the common atress of silk screen spare, increases the bulk strength of silk screen skeleton.

In some embodiments of the present invention, the fixing net includes a plurality of first wires 3 and a plurality of second wires 11, and any one of the first wires 3 is connected to any one of the second wires 11 after being perpendicularly crossed. With the fixed network by a plurality of first wire 3 and second wire 11 form through establishment technology establishment, can strengthen the joint strength and holistic structural strength of single fixed network to a certain extent, avoid the fixed network because the erosion of external environment such as rainwater to the fixed network in long-time use, the structural strength who leads to the fixed network changes, can increase the overall structure intensity of fixed network through above-mentioned design, and the contact point of first wire 3 and second wire 11 all forms through welding process connection.

When the fixing net is actually produced and used, the end part of the fixing net woven by the first metal wires 3 and the second metal wires 11 is connected with the reinforcing piece 2, so that the use strength of the fixing net is increased.

Further, the rigidity of fixed net can be guaranteed to the reinforcement 2 that sets up to reinforcement 2 is U-shaped steel sheet or two angle irons, and its tip parcel that can be with the silk screen skeleton that fixed net and silk screen spare constitute increases the bulk strength of silk screen skeleton.

In some embodiments of the present invention, the wire mesh member is a third wire 10 extending continuously in a wave shape, and the folded end of the third wire 10 is connected to any one of the first wires 3 or any one of the second wires 11. The screen mesh piece that will set up designs into by the third wire 10 integrated into one piece that is the V-arrangement, has guaranteed the bulk strength of screen mesh piece to the screen mesh piece that produces in the real life makes the wave form by a complete wire through bending folding process, and the peak valley of every section wave all is the V-arrangement, and the operating and processing personnel of being convenient for guarantees its one shot forming when processing screen mesh piece, need not to spend more process time and processing cost.

In some embodiments of the present invention, a plurality of third wires 10 are disposed between two fixing nets at equal intervals in a height direction of the fixing nets. Set up a plurality of silk screen wares along the direction of height equidistance of fixed network between two fixed networks, can avoid fixed network and silk screen spare to form the space too sparsely, can't be for playing the effect of afforestation guardrail, but also can not guarantee the bulk strength of this device.

Furthermore, the folding ends of any two adjacent third metal wires 10 deviate from each other, so that the structural strength of a wire mesh framework formed by the wire mesh piece and the fixing mesh can be improved, and the service life of the wire mesh framework is prolonged.

Furthermore, the position of the folding end of any two adjacent third metal wires 10 is the same, so that the later-stage operators can bend the wire mesh framework conveniently, the processing is facilitated, and the wire mesh framework is suitable for different use environments.

In some embodiments of the invention, the first wire 3, the second wire 11, and the third wire 10 each have a diameter greater than or equal to 2.5 mm. When the diameters of the first metal wire 3, the second metal wire 11 and the third metal wire 10 are larger than or equal to 2.5mm, the cost can be saved while the integral strength of the device can be ensured, and excessive material waste is avoided.

And the diameters of the first wire 3, the second wire 11 and the third wire 10 may also be 2.8mm or 3.0mm and ensure the rigidity and strength thereof.

Furthermore, the first metal wire 3, the second metal wire 11 and the third metal wire 10 are made of steel, and are steel wires which are processed into products by cold drawing of hot rolled wire rods, and the steel wires are plated with a layer of metal or alloy on the surface of the steel wires which are not smooth and require plating, so that one purpose is to prevent corrosion of the steel wires and prolong the service life of the steel wires, such as galvanization (hot galvanizing of the steel wires, electrogalvanizing of the steel wires), aluminizing, zinc-plated aluminum alloy and the like; the second purpose is to provide steel wires with certain special properties, such as the production of tire steel wires and steel cord steel wires, in order to ensure good bonding between the steel wires and rubber, the former needs to be plated with copper, brass (see brass plating of the steel wires) or bronze, and the latter needs to be plated with brass. In the arrangement of the process flow when the plated steel wire is produced, some steel wires are plated and then drawn, namely the plating process is arranged before the drawing of the finished product; some steel wires are drawn and plated, that is, the steel wires are plated after being drawn into finished products. Generally, when the surface coating of the steel wire is required to be bright and compact and have higher strength, the steel wire is firstly plated and then pulled, while when the surface coating of the steel wire is not very high, and the strength and toughness of a finished product have no special requirements, but when the weight of the coating has certain requirements, the steel wire is firstly pulled and then plated.

In some embodiments of the invention, the area of the grid space formed by any first wire 3 and any second wire 11 adjacent thereto is less than 100 square centimeters. The grid space area formed by any first metal wire 3 and any second metal wire 11 adjacent to the first metal wire is smaller than 100 square millimeters, so that the phenomenon that the space formed by the fixing net and the screen mesh is too sparse and the greening guardrail cannot be realized is avoided, and the overall strength of the device cannot be guaranteed.

In some embodiments of the invention, the upright 1 is provided with stabilizing elements for fixing it to the ground. Can carry this device at earth such as laying outdoors through the steadiness spare that sets up in stand 1, avoid stand 1 to adopt ordinary fixed mode, can't provide stable support for stand 1 and the silk screen framework of being connected with stand 1.

In some embodiments of the present invention, the fixing member includes a screw rod 5 inserted into the upright 1, the screw rod 5 is sleeved with a plurality of nuts 6 in threaded fit therewith, and one end of the screw rod 5 close to the ground is detachably provided with a ground inserting nail 9. The screw rod 5 penetrating the upright post 1 can be inserted into the ground for the ground inserting nail 9 detachably connected with the screw rod, so that the condition that a constructor needs to take a lot of trouble to drive the upright post 1 fixedly inserted with the ground inserting nail 9 into the ground is avoided; when in actual use, the ground inserting nail 9 is connected with the screw rod 5 through the nut 6 in a sleeved mode, then the screw rod 5 is driven to rotate on the nut 6 through a tool wrench, the screw rod 5 and the stand column 1 are forced to move relatively, then the ground inserting nail 9 is pushed into the ground, and the stand column 1 is fixed; and the lead screw 5 that sets up can also provide the locking ability with the cooperation of nut 6, avoids inserting ground nail 9 and returns to influence stand 1 and holistic stability in 1.

In some embodiments of the present invention, a gear 8 engaged with the screw 5 is rotatably disposed in the upright post 1, a through hole is disposed on a side wall of the upright post 1, a C-shaped locking rod 7 penetrates through the through hole, and a toothed belt engaged with the gear 8 is mounted on the locking rod 7. The C-shaped locking rod 7 can be used for better fixing the silk screen framework on the upright post 1 under the driving of the screw rod 5, so that the silk screen framework is prevented from falling off the upright post 1, and the safety of the device is prevented from being influenced; the locking rod 7 and the screw rod 5 which are C-shaped are engaged through the gear 8, the possibility that the locking rod 7 is not easy to loosen on the upright post 1 is ensured, and the overall stability of the device is improved.

To sum up, this application embodiment provides a guardrail device, including a plurality of guardrail units of splicing each other, every guardrail unit all includes a plurality of stand 1, installs the silk screen skeleton on any one stand 1, installs the mounting that is used for fixed silk screen skeleton on the stand 1. According to the technical scheme, a plurality of guardrail units which are spliced mutually can be freely rotated by a user, so that the number of the guardrail units which are suitable for the user to need is selected, and the waste of materials is avoided; and the stand 1 that sets up in every guardrail unit can provide necessary support for the silk screen skeleton, avoid the silk screen skeleton when accepting separation and decoration effect, provide stable support, avoid the silk screen skeleton to appear the possibility of warping in long-time use, and the silk screen skeleton that sets up passes through the separation structure that special weaving technology formed, and silk screen skeleton in the time of manufacturing is after the intensive design, there is not any welding seam fracture after long-time use, and carry out surface corrosion protection to it, long service life, the surface is bright for different plants and the customization colour customization panel size and shape of surrounding environment, unique design environmental protection, more be fit for the plant climbing. The environment is not polluted, the surrounding environment is improved, and the vertical greening, wall greening, roof greening and road greening can be performed, and the mounting modes are diversified. Can be in the city building wall body cooperation climbing plant installation, increase urban afforestation area, the vegetation is through absorbing carbon oxide, pollution particle and emission clean and cooling air, and the facade covers the wall, prevents to scribble. Noise abatement on the busy street of traffic increases the area of the sunshade of road both sides, and driver's visual fatigue also can be alleviated to the afforestation rail, and the protectiveness of structure is higher than general road. The panel can be the field regulation design, and the fixed shaping of flexible, the shape becomes the commonality high, and the design effect is diversified, and its three-dimensional spatial structure more can promote visual effect's third dimension. The structural specificity is fully utilized, the visual effect of three-dimensional sense is achieved, and the appearance is attractive. The overall structure realizes high energy-saving structural layout on the spatial structure.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a guardrail device, its characterized in that includes a plurality of guardrail units of splicing each other, every the guardrail unit all includes a plurality of stand, install silk screen skeleton and mounting on the stand, the mounting is used for fixing the silk screen skeleton.

2. The barrier device of claim 1 wherein the wire mesh framework comprises two fixed meshes and a plurality of wire mesh members positioned between the two fixed meshes; two the fixed net all with the silk screen spare is connected, the piece is all installed to the both ends of fixed net and is reinforceed.

3. The barrier device of claim 2 wherein the mounting net comprises a plurality of first wires and a plurality of second wires, any one of the first wires being connected to any one of the second wires after crossing perpendicularly.

4. The barrier device of claim 3 wherein the wire mesh member is a third wire that is undulating and continuously extending and has a folded end connected to either the first wire or the second wire.

5. The barrier device of claim 4 wherein a plurality of the third wires are disposed equidistant between the two anchor nets in the height direction of the anchor nets.

6. The barrier device of claim 5 wherein the first, second and third wires each have a diameter of greater than or equal to 2.5 mm.

7. The barrier device of claim 6 wherein the area of the lattice space formed by any of said first wires and any of said second wires adjacent thereto is less than 100 square centimeters.

8. A barrier device according to claim 1 wherein the post is provided with stabilising members for securing it to the ground.

9. The guardrail device of claim 8 wherein the stabilizing member comprises a threaded rod disposed through the upright, the threaded rod is sleeved with a plurality of nuts in threaded engagement therewith, and one end of the threaded rod near the ground is detachably provided with a ground pin.

10. The guardrail device according to claim 9, wherein a gear engaged with the screw rod is rotatably disposed in the column, a through hole is disposed in a side wall of the column, a C-shaped locking rod is disposed in the through hole, and a toothed belt engaged with the gear is disposed on the locking rod.