CN214653431U - Maintenance device for automobile coating lifting appliance - Google Patents

Abstract

The utility model relates to a maintenance device for automobile coating hoist. Comprises a standing platform, a support frame, a hanging rail, a walking rail, a movable rail and a driving assembly; the support frames are vertically arranged on two sides of the standing platform, the hanger rail is transversely erected between the support frames on the two sides, the walking track is hung between the hanger rail and the standing platform through the hanging columns, and the walking track and the hanger rail are arranged in parallel; the hanging columns are hung on the supporting frame; be equipped with the breach on the walking track, the activity track passes through drive assembly to be installed in breach department, and drive assembly can drive the activity track and reciprocate to open or close the breach. The utility model discloses according to the structural feature of C shape hoist, the maintenance device of design rather than structural adaptation, the running gear of C shape hoist can push into maintenance device, realizes opening and closing of walking track through the activity track, and the quick maintenance running gear of track that the operating personnel accessible was opened has improved maintenance efficiency, has reduced the degree of difficulty of maintenance.

Description

Maintenance device for automobile coating lifting appliance

Technical Field

The utility model discloses car application equipment maintenance technical field, more specifically relates to a maintenance device for car application hoist.

Background

In the automobile pretreatment electrophoresis process, a C-shaped lifting appliance bears a white automobile body, and the automobile body pretreatment electrophoresis coating is completed through the pretreatment electrophoresis process at a certain speed under the traction of a suspension traction chain. The weight of the C-shaped lifting appliance is about 1 ton, and the height of the walking track of the C-shaped lifting appliance from the ground is 4 m. Under the existing conditions, the walking track is a totally-enclosed track, and the walking assembly cannot be quickly disassembled and maintained. And (3) maintaining the walking components on two sides, moving the C-shaped lifting appliance on the premise of lifting the C-shaped lifting appliance, separating the front end or the rear end of the C-shaped lifting appliance from the walking track, and disassembling and maintaining in the air with the height of more than 3 meters. After the maintenance is finished, the walking assembly is pushed into the walking track, the maintenance operation difficulty is high, and certain safety risk exists in the operation. If the middle walking assembly needs to be maintained or all the walking assemblies need to be replaced, the walking assembly of the C-shaped lifting appliance can only be separated from the walking track of the C-shaped lifting appliance main body, the C-shaped lifting appliance main body is placed on the ground, and then the whole walking assembly is separated from the walking track and is lifted to the ground. After the maintenance is finished, the walking assembly is arranged in the C-shaped lifting appliance walking track in the air with the height of more than 3 m, and the C-shaped lifting appliance main body and the walking assembly are lifted for assembly. The whole process is high in assembly operation difficulty, a large amount of manpower and material resources are required to be consumed, and safety risks are easy to occur in high-altitude operation of maintenance personnel.

Chinese patent CN207918375U, published as 2018.09.28, discloses a hoist for maintaining the upper and lower wires of a lifting appliance, which has simple structure and convenient operation; however, when the device is used for maintaining the traveling assembly of the C-shaped lifting appliance, due to the sealing property of the traveling rail, the device must be disassembled for maintenance, and the device also needs to be assembled at high altitude after maintenance is completed, so that the operation difficulty is high.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome at least one defect among the above-mentioned prior art, provide a maintenance device for automobile painting hoist, can realize the walking subassembly of quick replacement, maintenance C shape hoist.

In order to solve the technical problem, the utility model discloses a technical scheme is: a maintenance device for an automobile coating hanger comprises a standing platform, a support frame, a hanger rail, a walking rail, a movable rail and a driving assembly; the support frames are vertically arranged on two sides of the standing platform, the hanger rail is transversely erected between the support frames on the two sides, the walking track is hung between the hanger rail and the standing platform through a hanging post, and the walking track and the hanger rail are arranged in parallel; the hanging columns are hung on the supporting frame; the movable rail is arranged at the notch through the driving assembly, and the driving assembly can drive the movable rail to move up and down so as to open or close the notch.

The utility model discloses the maintenance device who sets up, when using, hoist whole device, hoist C shape hoist simultaneously, push walking assembly to the walking track, the orbital structure of walking is the same with the walking track structure of former C shape hoist, walking assembly just so can directly push to maintenance device's walking track on, slide on the walking track, drive assembly drive activity track rebound, breach on the walking track is opened, the pulley of the walking assembly that will need maintenance or change pushes away breach department, maintenance person just can be quick like this, change the pulley. The standing platform is used for operating personnel to stand, and the hoisting machine will be whole device hoist the backshell and pass through the hanger rail and fix the device on the truss of factory building, the long-time work of being convenient for on the one hand, and on the other hand also is convenient for bear gravity, because C shape hoist installs the back on the maintenance device heavier, the maintenance device need bear great gravity, is not being convenient for stability operation and bears gravity through the hoisting machine hoist always.

In one embodiment, the walking track and the movable track have the same structure and are I-shaped tracks. The walking track that C shape hoist walking subassembly originally connected is the I-shaped, consequently establishes maintenance device's walking track into rather than the same structure, and the walking track of pushing to maintenance device of walking subassembly of being convenient for is in.

In one embodiment, the driving assembly comprises an air cylinder and a portal frame type rack, the rack is mounted at the top of the traveling rail and erected at the notch, the air cylinder is vertically mounted at the top of the rack, and a piston of the air cylinder penetrates through the rack and is connected with the movable rail. The gantry-type frame can provide space for the piston of the cylinder to move, and is convenient for mounting and fixing the cylinder, so that the piston of the cylinder can move in the vertical direction; and the rack is arranged at the top of the walking track, so that the walking component cannot be influenced to be pushed into or withdrawn from the walking track. The cylinder drives the movable rail to move downwards, and the movable rail is positioned at the gap and connected with the walking rail; the cylinder drives the movable rail to move upwards, the movable rail leaves the walking rail, and the gap is opened.

In one embodiment, two groups of guide posts are vertically arranged on the inner side of the rack, and the movable track is positioned between the two groups of guide posts; linear bearings are sleeved on the guide columns, and the two groups of linear bearings are connected with the movable track through first joints; the end part of the piston is provided with a second joint, and the piston is connected with the movable track through the second joint. The guide post is arranged, so that the guide post can be installed to move along the stroke when the cylinder drives the movable rail to move, vertical upward and downward movement is achieved, deviation is avoided, and the movable rail cannot return to the original position after multiple times of operation.

In one embodiment, reinforcing ribs are arranged on two sides of the outer side of the rack, one side of each reinforcing rib is connected with the rack, and the other side of each reinforcing rib is connected with the top of the walking track. The strengthening rib can be the right triangle structure, further improves the steadiness of frame and walking track connection through the setting of strengthening rib.

In one embodiment, the hanger rail is provided with at least two pulleys, and the pulleys are connected with the hanger rail in a sliding way; the hanger rail is arranged right above the walking track. Lifting the C-shaped lifting appliance, after the traveling assembly is pushed into the traveling track, installing a lifting rope on the pulley, connecting one end of the lifting rope with the C-shaped lifting appliance, and connecting the other end of the lifting rope with a hoist; the C-shaped lifting appliance is fixed through the gravity of the hoist, so that the operation of an operator is facilitated.

In one embodiment, the walking rail is at least provided with two gaps at intervals, and each gap is provided with a movable rail through a driving assembly. Set up two breachs, two breachs are located walking orbital both ends respectively, can remove the maintenance change that shortest distance realized each wheel on the walking subassembly like this at C shape hoist.

In one embodiment, the periphery of the standing platform is further provided with guardrails in a surrounding manner. The guardrail is arranged to prevent operators from falling off during high-altitude operation.

In one embodiment, a ladder stand is arranged on one side of the standing platform. The crawling ladder is arranged to facilitate an operator to enter the standing platform.

In one embodiment, the support frame comprises upright columns and cross rods, the upright columns are vertically fixed on two sides of the standing platform, the cross rods are respectively and transversely erected on the upright columns on the two sides, and two ends of the hanger rail are respectively and fixedly connected with the cross rods on the two sides.

Compared with the prior art, the beneficial effects are: the utility model provides a pair of a maintenance device for automobile coating hoist according to the structural feature of C shape hoist, the maintenance device of design rather than structural adaptation, and the running gear of C shape hoist can push into maintenance device, realizes opening and closing of walking track through the activity track, and the quick maintenance running gear of track that the operating personnel accessible was opened has improved maintenance efficiency, has reduced the degree of difficulty of maintenance.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

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

Fig. 3 is a schematic structural view of the driving assembly connected to the movable rail according to the present invention.

Fig. 4 is a schematic front view of the driving assembly connected to the movable rail according to the present invention.

Fig. 5 is a schematic view of the relationship between the C-shaped sling and the walking rail in maintenance.

Reference numerals: 1. a standing platform; 2. a support frame; 3. hoisting a rail; 4. a traveling rail; 5. a movable track; 6. a drive assembly; 61. a cylinder; 62. a frame; 63. a piston; 64. a guide post; 65. a linear bearing; 66. a first joint; 67. a second linker 67 (67); 68. reinforcing ribs; 7. a pulley; 8. a guardrail; 9. climbing a ladder; 10. hoisting a column; 11. c-shaped lifting appliances; 12. a walking component.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.

As shown in fig. 1 to 5, a maintenance device for a vehicle painting C-shaped hanger 11 comprises a standing platform 1, a support frame 2, a hanger rail 3, a walking rail 4, a movable rail 5 and a driving assembly 6; the support frames 2 are vertically arranged on two sides of the standing platform 1, the hanger rail 3 is transversely erected between the support frames 2 on the two sides, the walking track 4 is hung between the hanger rail 3 and the standing platform 1 through the hanging post 10, and the walking track 4 and the hanger rail 3 are arranged in parallel; the hanging post 10 is hung on the support frame 2; be equipped with the breach on the walking track 4, movable rail 5 passes through drive assembly 6 to be installed in breach department, and drive assembly 6 can drive movable rail 5 and reciprocate to open or close the breach.

Wherein, the standing platform 1 designs the size of the platform, the lifting point of the platform, the height of the guardrail 8, the ladder stand 9 and the like according to the size of the C-shaped lifting appliance 11, so that the C-shaped lifting appliance 11 to be maintained can enter the standing platform 1 through the walking track 4 without interfering with the standing platform 1. Maintenance operation personnel can conveniently get into the platform, carry out the point inspection maintenance to the hoist. The hanger rail 3 is connected by adopting a clamping plate and is arranged on a steel beam of a factory building, and a plurality of 2 pulley 7 groups are arranged on the hanger rail 3 and are used for hoisting a C-shaped hanger 11 and realizing horizontal movement; the pulley 7 is arranged on the hanger rail 3, can freely slide, and is used for lifting the C-shaped hanger 11 and horizontally moving; the movable rail 5 is installed on the walking rail 4, and to the walking rail 4 according to the size suitable size breach that opens and shuts, the breach size according to walking 12 size design, slightly bigger can, breach department installation movable rail 5, the cylinder 61 up-and-down motion realizes opening and closing of walking rail 4 simultaneously.

The utility model discloses the maintenance device who sets up, as shown in fig. 5, when using, hoist whole device, hoist C shape hoist 11 simultaneously, push into walking subassembly 12 to walking track 4, walking track 4's structure is the same with former C shape hoist 11's walking track 4 structure, walking subassembly 12 just can directly push to maintenance device's walking track 4 like this on, slide on walking track 4, drive assembly 6 drive movable track 5 rebound, the breach on the walking track 4 is opened, the pulley 7 of walking subassembly 12 that will need maintenance or change pushes away breach department, maintenance person just can be quick like this, change pulley 7. Standing platform 1 is used for operating personnel to stand, and the hoisting machine will be whole device hoist the backshell and pass through hanger rail 3 with the device fix on the truss of factory building, the long-time work of being convenient for on the one hand, on the other hand also is convenient for bear gravity, because C shape hoist 11 is installed on the maintenance device after heavier, the maintenance device need bear great gravity, is hanging the stability of being not convenient for operation and bearing gravity through the hoisting machine always.

In one embodiment, the walking track 4 and the movable track 5 have the same structure and are both I-shaped tracks. The running rail 4 originally connected with the running component 12 of the C-shaped sling 11 is i-shaped, so that the running rail 4 of the maintenance device is designed to be the same as the running rail 4 of the maintenance device, and the running component 12 can be conveniently pushed into the running rail 4 of the maintenance device.

In one embodiment, as shown in fig. 3 and 4, the driving assembly 6 includes a cylinder 61, a gantry frame 62, the frame 62 is mounted on the top of the traveling rail 4 and erected at the gap, the cylinder 61 is vertically mounted on the top of the frame 62, and a piston 63 of the cylinder 61 penetrates through the frame 62 and is connected with the movable rail 5. The gantry-type frame 62 can provide space for the movement of the piston 63 of the cylinder 61, and is convenient for mounting and fixing the cylinder 61, so that the piston 63 of the cylinder 61 can move in the vertical direction; and, the frame 62 is provided on the top of the running rail 4 without affecting the pushing or withdrawing of the running assembly 12 into or out of the running rail 4. The cylinder 61 drives the movable rail 5 to move downwards, and the movable rail 5 is positioned at the gap and connected with the walking rail 4; the cylinder 61 drives the movable rail 5 to move upwards, the movable rail 5 leaves the walking rail 4, and the gap is opened.

In one embodiment, as shown in fig. 4, two sets of guide posts 64 are vertically disposed inside the frame 62, and the movable rail 5 is located at a position between the two sets of guide posts 64; linear bearings 65 are sleeved on the guide columns 64, and the two groups of linear bearings 65 are connected with the movable track 5 through first joints 66; the end of the piston 63 is provided with a second joint 67(67), and the piston 63 is connected to the movable rail 5 through the second joint 67 (67). The guide post 64 is arranged, so that the air cylinder 61 can drive the movable rail 5 to move, the guide post 64 can be installed to move by a stroke, vertical upward and downward movement is realized, deviation is avoided, and the movable rail 5 cannot return to the original position after multiple times of operation.

In one embodiment, as shown in fig. 3 and 4, the frame 62 is provided with reinforcing ribs 68 on both sides of the outer side thereof, and one side of the reinforcing ribs 68 is connected to the frame 62 and the other side is connected to the top of the running rail 4. The reinforcing ribs 68 can be in a right triangle structure, and the stability of the connection between the frame 62 and the running rail 4 is further improved by the arrangement of the reinforcing ribs 68.

In one embodiment, at least two pulleys 7 are arranged on the hanger rail 3, and the pulleys 7 are slidably connected with the hanger rail 3; the hanger rail 3 is provided right above the traveling rail 4. Hoisting the C-shaped lifting appliance 11, after the traveling assembly 12 is pushed into the traveling track 4, installing a lifting rope on the pulley 7, wherein one end of the lifting rope is connected with the C-shaped lifting appliance 11, and the other end of the lifting rope is connected with a hoist; the C-shaped lifting appliance 11 is fixed through the gravity of the hoist, so that the operation of an operator is facilitated.

In one embodiment, as shown in fig. 1, 2 and 5, the traveling rail 4 is provided with at least two gaps at intervals, and each gap is provided with a movable rail 5 through a driving assembly 6. According to the size and the distance of the C-shaped hanger 11 walking component 12, 2 walking rails 4 maintenance gaps are designed, 2 sets of movable rails 5 and driving components 6 are installed in the gaps, and the movable rails 5 are opened and closed by controlling the supply of compressed air of the air cylinders 61. When a single walking component 12 is repaired and replaced, the walking component 12 of the C-shaped lifting appliance 11 is moved to avoid the movable rail 5, then the movable rail 5 is opened, the C-shaped lifting appliance 11 is pulled, and the walking component 12 to be repaired or replaced is moved to the notch under the premise that the C-shaped lifting appliance 11 is lifted, so that quick and convenient replacement can be realized. The gaps of the C-shaped lifting appliance 11 walking track 4 are designed to be one in the front and back, the C-shaped lifting appliance 11 can move for the shortest distance, and under the condition that the platform is the minimum (the distance and the length of 2 walking components 12 at one end), the walking components 12 at two ends can be replaced, the size and the size of the device are effectively reduced, and the device is more compact and light.

In one embodiment, as shown in fig. 1, 2 and 5, the standing platform 1 is further surrounded with a guardrail 8. The guardrail 8 is arranged to prevent the operator from falling off during high-altitude operation. The guardrail 8 can be designed into a high guardrail 8 and a low guardrail 8, namely, the low guardrail 8 is arranged on the pushed side of the C-shaped lifting appliance 11, so that the influence of the guardrail 8 on the C-shaped lifting appliance 11 when the C-shaped lifting appliance is pushed is avoided; the other sides are designed as high guardrails 8; wherein the low guardrail 8 guarantees the hoist trafficability characteristic, increases single pole guardrail 8 in 8 upper sides of low guardrail and the position department that the hoist is not interfered, protects operator's safety.

In one embodiment, a ladder stand 9 is arranged on one side of the standing platform 1. The ladder stand 9 is installed at the edge of the lifting appliance and used for people to climb into a maintenance platform.

In one embodiment, the supporting frame 2 comprises a vertical column and a cross rod, the vertical column is vertically fixed on two sides of the standing platform 1, the cross rod is respectively and transversely erected on the vertical column on two sides, and two ends of the hanger rail 3 are respectively and fixedly connected with the cross rods on two sides.

The maintenance device designed by the utility model is safe and comfortable in operation, the structure of the lifting appliance maintenance platform is reasonably designed according to the size and the structural characteristics of the C-shaped lifting appliance 11, the maintenance part of the C-shaped lifting appliance 11 can enter the maintenance platform, and the operator can conveniently stand on the platform freely for maintenance, so that the operation is safer and more comfortable; the utility model has compact structure, and can realize the maintenance and replacement of the two sections of walking components 12 under the condition of the shortest moving distance of the lifting appliance and the minimum device by reasonably designing the size and the position of the movable track 5 of the walking track 4; the utility model discloses still can realize quick assembly disassembly, design movable rail 5 adopts cylinder 61 motion control, can conveniently realize opening and shutting that movable rail 5 said fast. The movable rail 5 is arranged on a linear bearing 65, the linear bearing 65 penetrates through the guide post 64, and the piston 63 of the cylinder 61 pulls the movable rail 5 up and down, so that the up-and-down movement of the movable rail 5 is realized, and the movement precision is ensured. The upper end of the guide post 64 is provided with a threaded hole, a hole is formed in the movable rail bracket, and the movable rail bracket is fixedly installed through a bolt.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A maintenance device for an automobile coating hanger is characterized by comprising a standing platform (1), a support frame (2), a hanger rail (3), a walking rail (4), a movable rail (5) and a driving assembly (6); the supporting frames (2) are vertically arranged on two sides of the standing platform (1), the hanging rail (3) is transversely erected between the supporting frames (2) on the two sides, the walking track (4) is hung between the hanging rail (3) and the standing platform (1) through a hanging column (10), and the walking track (4) and the hanging rail (3) are arranged in parallel; the hanging columns (10) are hung on the support frame (2); the walking track (4) on be equipped with the breach, activity track (5) install in breach department through drive assembly (6), drive assembly (6) can drive activity track (5) and reciprocate to open or close the breach.

2. The maintenance device for the automobile coating hanger according to claim 1, characterized in that the running rail (4) and the movable rail (5) have the same structure and are I-shaped rails.

3. The maintenance device for the automobile painting hanger according to claim 2, characterized in that the driving assembly (6) comprises a cylinder (61) and a gantry type frame (62), the frame (62) is installed on the top of the traveling rail (4) and erected at the gap, the cylinder (61) is vertically installed on the top of the frame (62), and a piston (63) of the cylinder (61) penetrates through the frame (62) and is connected with the movable rail (5).

4. The maintenance device for an automotive painting spreader according to claim 3, characterized in that two sets of guide posts (64) are vertically arranged inside the frame (62), and the movable rail (5) is located at a position between the two sets of guide posts (64); the guide columns (64) are sleeved with linear bearings (65), and the two groups of linear bearings (65) are connected with the movable track (5) through first joints (66); the end part of the piston (63) is provided with a second joint 67(67), and the piston (63) is connected with the movable track (5) through the second joint 67 (67).

5. The maintenance device for the vehicle painting spreader according to claim 3, characterized in that reinforcing ribs (68) are arranged on both sides of the outer side of the frame (62), one side of each reinforcing rib (68) is connected with the frame (62), and the other side is connected with the top of the running rail (4).

6. The maintenance device for an automotive painting spreader according to claim 4, characterized in that the hanger rail (3) is provided with at least two pulleys (7), and the pulleys (7) are slidably connected with the hanger rail (3); the hanger rail (3) is arranged right above the walking track (4).

7. The maintenance device for the vehicle painting spreader according to claim 4, characterized in that the running rail (4) is provided with at least two gaps at intervals, and each gap is provided with a movable rail (5) through a driving assembly (6).

8. The maintenance device for a vehicle painting spreader according to any one of claims 1 to 7, characterized in that the standing platform (1) is further surrounded with guard rails (8).

9. The maintenance device for a vehicle painting spreader according to claim 8, characterized in that a ladder stand (9) is provided on one side of the standing platform (1).

10. The maintenance device for the automobile painting hanger according to claim 8, characterized in that the support frame (2) comprises vertical columns and horizontal rods, the vertical columns are vertically fixed on two sides of the standing platform (1), the horizontal rods are respectively and transversely erected on the vertical columns on the two sides, and two ends of the hanger rail (3) are respectively and fixedly connected with the horizontal rods on the two sides.

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