CN219402957U - Automatic end plate butt joint and welding device - Google Patents

Abstract

The utility model discloses an automatic end plate butt joint and welding device, which comprises a base ground rail, wherein both sides of the base ground rail are respectively provided with a sliding part and a fixing part, the base ground rail is also provided with a workpiece placing part, and the sliding part and the workpiece placing part are connected through a connecting seat; and the workpiece placement part positioned at the left side is movable; the sliding part comprises a welding group, an inclined placing component and a moving group, wherein the moving group is meshed with a rack arranged on a ground rail of a base and moves along the direction of the rack, the welding group and the inclined placing component are fixed on the moving group through fasteners, the welding device can integrate welding straight-line H-shaped steel and arc-shaped H-shaped steel, improves the application range of welding, can reduce the working procedure, effectively improves the welding efficiency of two surfaces of a workpiece to be welded once, effectively realizes the automation of welding through the cooperation of each component, improves the welding efficiency and quality, and reduces the manual strength.

Description

Automatic end plate butt joint and welding device

Technical Field

The utility model relates to the technical field of steel section welding, in particular to an automatic end plate butt joint and welding device.

Background

Submerged arc welding machines are one of welding equipment in steel structure manufacturing, and particularly in H-shaped steel consisting of large thick plate materials, the submerged arc welding machines are the most preferred welding equipment which is accepted by the dominant process of submerged arc automatic welding. At present, most H-shaped steel components are linear and can be finished on box type welding equipment, but if the welding of the H-shaped steel consisting of an oversized circular arc or semicircular arc or an arc-shaped large circular plate is carried out, the welding work cannot be finished by a common box type welding machine, and if the box type welding machine is modified, the welding machine has the advantages of long construction period, high cost, great workload of modifying the modified equipment, and the like and high production cost.

Secondly when welding shaped steel, assemble panel and shaped steel combination, later weld again, after the welding is accomplished a side, the other side also needs to weld, because the size of shaped steel is great, when overturning, need fix the shaped steel, hoist device carries out hoist and mount upset to the work piece, later weld again, above operation does not have the continuity, not only there is the risk that takes place the work piece and drop, staff's amount of labour is still very big moreover, degree of automation is not high, bring very big inconvenience for production, production efficiency is low, the quality is not high, can not satisfy the production demand of growing development day by day.

Disclosure of Invention

The utility model aims to overcome the existing defects, and provides an automatic end plate butt joint and welding device which can integrate the functions of welding straight H-shaped steel and arc-shaped H-shaped steel, improve the welding application range, reduce the working procedures, weld two surfaces of a workpiece at one time, effectively improve the welding efficiency, effectively realize the automation of welding, improve the welding efficiency and quality, reduce the labor intensity and effectively solve the problems in the background art through the cooperation of all parts.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the automatic end plate butt joint and welding device comprises a base ground rail, wherein two sides of the base ground rail are respectively provided with a sliding part and a fixing part, the base ground rail is also provided with two workpiece placement parts, and the sliding parts and the workpiece placement parts are connected through connecting seats; and the workpiece placement section on the left side is movable.

The sliding part comprises a welding group, an inclined placing component and a moving group, wherein the moving group is meshed with a rack arranged on a base ground rail and moves along the direction of the rack, the welding group and the inclined placing component are fixed on the moving group through fasteners, the inclined placing component comprises a grabbing group, a lifting adjusting group and a first driving group, the first driving group is located near one side of the lifting adjusting group, the output end of the grabbing group is correspondingly arranged with the lifting adjusting group, and the lifting adjusting group is obliquely arranged on the moving group.

The work piece is placed the portion and is included motor mount pad, rotating electrical machines, installation base, lower plate, place cassette and work piece clamping seat, the installation base is located the lower surface of lower plate, and both link to each other through the fastener, the higher authority of installation base is provided with the motor mount pad, be provided with the rotating electrical machines in the through-hole of motor mount pad, the tip cover of rotating electrical machines is equipped with places the cassette, be provided with the work piece clamping seat on placing the cassette.

Further, the base ground rail is provided with a chassis mounting plate, the chassis mounting plate is provided with a grabbing group, the front end of the chassis mounting plate is provided with a support guide plate seat, and the end part of the support guide plate seat is provided with a first driving group and a lifting adjusting group.

Further, the lifting adjustment group comprises an inclined installation support plate, an inclined support seat, an inclined placement guide seat and an adjustment motor, wherein the inclined support seat is obliquely arranged on the support guide plate seat, the inclined installation support plate is arranged on the inclined support seat, the adjustment motor is fixed on the lower surface of the inclined installation support plate through a fastener, and the output end of the adjustment motor penetrates through a circular through hole of the inclined installation support plate and is connected with the lower surface of the inclined placement guide seat.

Further, one end of the inclined placement guide seat is provided with a guide square pipe, and the guide square pipe is sleeved with a square through hole in the inclined installation support plate.

Further, the upper surface of oblique installation extension board sets up a support seat, a side of support seat is provided with the guide holder of slope placement, a side of guide holder is provided with deep floor, another side of guide holder sets up the slip direction cassette that agrees with the guide holder scale of slope placement.

Further, snatch the group and include robotic arm, press seat mounting panel, elastic connection seat, push down seat and intermediate junction board, robotic arm's output is connected with pressing the seat mounting panel, the both ends symmetry of pressing the seat mounting panel is provided with the elastic connection seat, the end connection of elastic connection seat has intermediate junction board, the lower surface of intermediate junction board is provided with pushes down the seat.

Further, the movable group comprises a movable motor, a driving guide wheel and an auxiliary guide wheel, wherein the driving guide wheel is arranged at the output end of the movable motor, the auxiliary guide wheel is positioned at one side of the driving guide wheel, and the driving guide wheel and the auxiliary guide wheel are meshed with the rack.

Further, guide wheels are arranged on the underframe mounting plate and the lower bottom plate, and the guide wheels are arranged on the base ground rail in a rolling mode.

Further, the base ground rail comprises frame support, rack mounting panel and fixed mounting seat, the rack mounting panel is located the intermediate position that the frame support constitutes the framework, the rack is located the framework that rack mounting panel and frame support constitute, fixed mounting seat symmetry sets up in the front and back both sides of frame support.

Compared with the prior art, the automatic end plate butt joint and welding device has the following advantages:

1. the welding device integrates the linear H-shaped steel and the arc-shaped H-shaped steel, the welding application range is improved, the two surfaces of a workpiece are welded at one time, the welding efficiency is effectively improved, the whole process of the welding device adopts automatic welding, the welding efficiency and the welding quality are improved, and the manual strength is reduced;

2. the workpiece placement part positioned at the left side, the welding group positioned at the left side and the inclined placement component positioned at the left side are adjusted under the action of the moving group, so that the device is convenient for use of section steel with different lengths, and the convenience of use is improved;

3. under the effect of rotating electrical machines, make and place cassette rotatory 180, make work piece clamp holder rotatory to the another side of shaped steel, adjustment motor starts and drives the welding baffle that places on the guide holder to one side and go upward, and first drive group starts, snatchs the welding baffle and send to the welding district, and the welding group starts again, welds shaped steel and welding baffle, accomplishes the welding of both sides of shaped steel, and the stability when the work piece can be guaranteed to work piece clamp holder simultaneously, improves the security of work.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a front view of the present utility model;

FIG. 3 is a schematic view of a tilt assembly;

FIG. 4 is a schematic view of a work placement unit;

FIG. 5 is a schematic diagram of a second tilt assembly;

FIG. 6 is a schematic diagram of a mobile group structure;

FIG. 7 is a schematic view of a lifting adjustment set;

FIG. 8 is a front view of the lift adjustment group;

FIG. 9 is a schematic view of a base rail structure;

FIG. 10 is a schematic view of a grabbing group structure;

fig. 11 is a front view of a gripper group.

In the figure: 1 a sliding part;

11 welding groups;

12 inclined placing components, 121 grabbing groups, 1211 pressing seat mounting plates, 1212 elastic connecting seats, 1213 pressing seats and 1214 intermediate connecting plates;

122 lifting adjustment groups, 1221 oblique mounting support plates, 1222 oblique supporting supports, 1223 oblique placing guide seats and 1224 adjusting motors;

123 a first drive-group;

13 moving groups, 131 moving motors, 132 driving guide wheels and 133 auxiliary guide wheels;

2 a workpiece placing part, a motor mounting seat 21, a rotating motor 22, a mounting base 23, a lower bottom plate 24, a placing clamping seat 25 and a workpiece clamping seat 26;

3 a fixing part;

4, a base ground rail, a 41 frame body support, a 42 rack, a 43 rack mounting plate and a 44 fixed mounting seat;

5 a chassis mounting plate;

and 6, a support guide plate seat.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description of the present utility model and simplification of the description, and it is not indicated or implied that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. When a feature is referred to as being "disposed," "secured" or "connected" to another feature, it can be directly disposed, secured or connected to the other feature or it can be indirectly disposed, secured or connected to the other feature.

Referring to fig. 1-11, the present utility model provides a technical solution: the automatic end plate butt joint and welding device comprises a base ground rail 4, wherein sliding parts 1 and fixing parts 3 are respectively arranged on two sides of the base ground rail 4, a workpiece placing part 2 is further arranged on the base ground rail 4, and the sliding parts 1 and the workpiece placing part 2 are connected through a connecting seat; and the work placement section 2 located on the left side is movable. Specifically, the base ground rail 4 is connected with the external connecting seat through the fastener, and the sliding part 1 and the workpiece placement part 2 arranged at the left end of the base ground rail 4 can move on the base ground rail 4 so as to be suitable for the use of section steel with different lengths, the base ground rail 4 provides installation positions for the sliding part 1, the workpiece placement part 2 and the fixing part 3, and the guide wheels on the sliding part 1 and the left workpiece placement part 2 move along the base ground rail 4, so that the convenience of use is improved.

The sliding part 1 comprises a welding group 11, an inclined placing component 12 and a moving group 13, wherein the moving group 13 is meshed with a rack 42 arranged on the base ground rail 4 and moves along the direction of the rack 42, and the welding group 11 and the inclined placing component 12 are fixed on the moving group 13 through fasteners; specifically, the welding set 11 is a welding robot, and a rotary driving motor for controlling the welding direction of the welding robot is arranged at the lower end of the welding set, so that the welding robot can efficiently and accurately finish welding work; the movable group 13 arranged on the underframe mounting plate 5 is started to drive the underframe mounting plate 5 to move left and right, so that the welding group 11 at the left end and the inclined placement component 12 are adjusted, and the convenience of welding is improved.

The inclined placement assembly 12 comprises a grabbing group 121, a lifting adjustment group 122 and a first driving group 123, wherein the first driving group 123 is positioned near one side of the lifting adjustment group 122, the output end of the grabbing group 121 is arranged corresponding to the lifting adjustment group 122, and the lifting adjustment group 122 is obliquely arranged on the moving group 13; specifically, the first driving group 123 controls the start and stop of the grabbing group 121, and the grabbing group 121 is controlled to compress the workpieces on the lifting adjustment group 122, so that convenience in press fitting is improved, the lifting adjustment group 122 and the first driving group 123 are located on the support guide plate seat 6, the first driving group 123 is located on the left side of the lifting adjustment group 122, and the grabbing group 121 is located on the rear side of the lifting adjustment group 122.

The workpiece placement part 2 comprises a motor mounting seat 21, a rotating motor 22, a mounting base 23, a lower bottom plate 24, a placement clamping seat 25 and a workpiece clamping seat 26, wherein the mounting base 23 is positioned on the lower surface of the lower bottom plate 24 and is connected with the lower surface of the lower bottom plate through fasteners, the motor mounting seat 21 is arranged on the upper side of the mounting base 23, the rotating motor 22 is arranged in a through hole of the motor mounting seat 21, the placement clamping seat 25 is sleeved on the end part of the rotating motor 22, and the workpiece clamping seat 26 is arranged on the placement clamping seat 25.

Specifically, the lower surface of lower plate 24 is provided with 4 guide pulleys, the guide pulley rolls and sets up on base ground rail 4, rotating electrical machines 22 rotates, drives to place cassette 25 and takes place the angle deflection, realizes the adjustment of welding angle, and then adjusts the welding position of work piece, is provided with a draw-in groove on placing cassette 25, and the work piece is placed in this draw-in groove, work piece presss from both sides tight seat 26 by cylinder and hold-down plate and constitutes, the cylinder is elongated, drives the hold-down plate and compresses tightly the work piece, and the work piece does not take place to remove when guaranteeing the welding, improves welded quality.

Further, the base ground rail 4 is provided with a chassis mounting plate 5, the chassis mounting plate 5 is provided with a welding group 11 and a moving group 13, the front end of the chassis mounting plate 5 is provided with a support guide plate seat 6, and the end part of the support guide plate seat 6 is provided with a grabbing group 121, a first driving group 123 and a lifting adjustment group 122. The rear end of the chassis mounting plate 5 is provided with a welding set 11, and provides a mounting position for the moving set 13, the moving set 13 drives the chassis mounting plate 5 to displace, the moving set 13 drives the grabbing set 121, the first driving set 123 and the lifting adjustment set 122 to move, and after the moving set is moved to a set position, the lifting adjustment set 122 is used for adjusting the height position for placing a workpiece, and under the action of the grabbing set 121, the workpiece is clamped.

Further, the lifting adjustment set 122 includes an inclined mounting support 1221, an inclined support 1222, an inclined placement guide 1223, and an adjustment motor 1224, where the inclined support 1222 is obliquely disposed on the support guide 6, the inclined support 1222 is provided with the inclined mounting support 1221, the adjustment motor 1224 is fixed on the lower surface of the inclined mounting support 1221 by a fastener, and the output end of the adjustment motor 1224 passes through a circular through hole of the inclined mounting support 1221 and is connected with the lower surface of the inclined placement guide 1223.

Specifically, the diagonal bracing support 1222 is composed of four square tubes, wherein the square tubes located on the support guide plate seat 6 are vertically arranged, the remaining two square tubes are obliquely arranged, the inclination angle of the two square tubes is 10 ° -25 °, the upper inclined surface of the vertical square tube and the upper surface of the obliquely arranged square tube are the same plane, and the diagonal mounting support 1221 is provided with square through holes and circular holes to provide mounting vacancies for controlling the lifting of the obliquely arranged guide seat 1223.

Further, one end of the inclined placement guide seat 1223 is provided with a guide square tube, the guide square tube is sleeved with a square through hole on the inclined placement support plate 1221, and specifically, the guide square tube is located on one side of the lower surface of the inclined placement guide seat 1223, penetrates through the square through hole on the inclined placement support plate 1221, plays a role in guiding, and ensures that the moving direction of the inclined placement guide seat 1223 is located on the axis of the guide square tube.

Further, the upper surface of the oblique mounting support plate 1221 is provided with a support stand, one side of the support stand is provided with an oblique placement guide seat 1223 guide seat, one side of the guide seat is provided with a reinforcing rib plate, the other side of the guide seat is provided with a sliding guide clamping seat matched with the oblique placement guide seat 1223 in scale, and specifically, the guide seat forms a guide groove to enable the oblique placement guide seat 1223 to slide in the guide groove, wherein the distance of the guide groove is slightly larger than the size of the oblique placement guide seat 1223, and the oblique placement guide seat 1223 is convenient to slide.

The guide holder is provided with an inductive probe, the inductive probe is used for detecting a welding guide plate on the inclined guide holder 1223, when the welding guide plate on the inclined guide holder 1223 is detected, the first driving group 123 is started to grab the welding guide plate and send the welding guide plate to a welding area, meanwhile, the adjusting motor 1224 is started to operate according to a set distance, so that the next welding guide plate is transported to the welding guide plate grabbing area, and meanwhile, the inductive probe is also arranged between square pipes which are obliquely arranged, so that the maximum travel and the minimum travel of the adjusting motor 1224 are limited.

Further, the grabbing unit 121 includes a mechanical arm, a pressing seat mounting plate 1211, an elastic connection seat 1212, a pressing seat 1213, and an intermediate connection plate 1214, where an output end of the mechanical arm is connected with the pressing seat mounting plate 1211, two ends of the pressing seat mounting plate 1211 are symmetrically provided with the elastic connection seat 1212, an end of the elastic connection seat 1212 is connected with the intermediate connection plate 1214, and a pressing seat 1213 is provided on a lower surface of the intermediate connection plate 1214. Specifically, the pressing seat 1213 is a magnetic component, under the action of the first driving set 123, the grabbing and transferring of the welding guide plate are realized, the welding guide plate and the section steel are butted to realize the welding function when the welding guide plate is transferred to the set welding area.

Further, the moving set 13 includes a moving motor 131, a driving guide wheel 132, and an auxiliary guide wheel 133, where the driving guide wheel 132 is disposed at an output end of the moving motor 131, the auxiliary guide wheel 133 is disposed at one side of the driving guide wheel 132, and the driving guide wheel 132 and the auxiliary guide wheel 133 are engaged with the rack 42.

Further, guide wheels are arranged on the underframe mounting plate 5 and the lower bottom plate 24, and the guide wheels are arranged on the base ground rail 4 in a rolling manner. Specifically, the guide wheel plays a supporting role, so that the underframe mounting plate 5 and the lower bottom plate 24 can be freely and movably arranged on the base ground rail 4, and under the action of the moving group 13, the stroke is accurately controlled, so that the welding precision is ensured.

Further, the base ground rail 4 is composed of a frame support 41, a rack 42, a rack mounting plate 43 and a fixed mounting seat 44, the rack mounting plate 43 is located at the middle position of the frame formed by the frame support 41, the rack 42 is located on the frame formed by the rack mounting plate 43 and the frame support 41, and the fixed mounting seats 44 are symmetrically arranged on the front side and the rear side of the frame support 41.

When in use: according to the length of the section steel to be processed, the movable motor 131 is started, the driving guide wheel 132 is meshed with the rack 42 to drive the underframe mounting plate 5 to move, the positions of the welding group 11, the inclined placing component 12 and the movable group 13 are adjusted, the external feeding group conveys the section steel into the groove in the workpiece placing part 2, at the moment, the cylinder in the workpiece clamping seat 26 is started to drive the compacting plate to compact the section steel, the section steel is not displaced when the section steel is overturned, the welding accuracy is ensured, the adjusting motor 1224 is started to drive the welding guide plate on the inclined placing guide seat 1223 to move upwards, the first driving group 123 is started when the sensing probe on the guide seat detects the welding guide plate on the inclined placing guide seat 1223, the welding guide plate is grabbed and sent to a welding area, after the section steel positioned on the workpiece clamping seat 26 is butted with the welding guide plate grabbed by the grabbing group 121, the welding group 11 is started, the section steel and the welding guide plate are welded, after welding is completed, the rotating motor 22 is started, the placing clamping seat 25 is rotated by 180 degrees, the workpiece clamping seat 26 is rotated to the other surface of the section steel, at the moment, the adjusting motor 1224 is started to drive the welding guide plate on the inclined placing guide seat 1223 to ascend, when the induction probe on the guide seat detects the welding guide plate on the inclined placing guide seat 1223, the first driving group 123 is started, the welding guide plate is grabbed and sent to the welding area, the welding group 11 is started again, and the section steel and the welding guide plate are welded, so that the welding of the section steel is completed.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. An automatic end plate butt joint and welding device comprises a base ground rail (4), and is characterized in that: the two sides of the base ground rail (4) are respectively provided with a sliding part (1) and a fixing part (3), the base ground rail (4) is also provided with two workpiece placement parts (2), and the sliding parts (1) are connected with the workpiece placement parts (2) through connecting seats;

the sliding part (1) comprises a welding group (11), an inclined placing component (12) and a moving group (13), wherein the moving group (13) is meshed with a rack (42) arranged on a base ground rail (4), the welding group (11) and the inclined placing component (12) are fixed on the moving group (13) through fasteners, the inclined placing component (12) comprises a grabbing group (121), a lifting adjusting group (122) and a first driving group (123), the first driving group (123) is positioned near one side of the lifting adjusting group (122), the output end of the grabbing group (121) is correspondingly arranged with the lifting adjusting group (122), and the lifting adjusting group (122) is obliquely arranged on the moving group (13);

the workpiece placement part (2) comprises a motor mounting seat (21), a rotating motor (22), a mounting base (23), a lower bottom plate (24), a placement clamping seat (25) and a workpiece clamping seat (26), wherein the mounting base (23) is positioned on the lower surface of the lower bottom plate (24), the mounting base and the lower surface are connected through fasteners, the motor mounting seat (21) is arranged on the upper side of the mounting base (23), the rotating motor (22) is arranged in a through hole of the motor mounting seat (21), the placement clamping seat (25) is sleeved at the end part of the rotating motor (22), and the workpiece clamping seat (26) is arranged on the placement clamping seat (25).

2. An automatic end plate butt joint and welding apparatus according to claim 1, wherein: be provided with chassis mounting panel (5) on base ground rail (4), be provided with on chassis mounting panel (5) and snatch group (121), the front end of chassis mounting panel (5) is provided with support baffle seat (6), the tip of support baffle seat (6) is provided with first drive group (123) and lift adjustment group (122).

3. An automatic end plate butt joint and welding apparatus according to claim 1, wherein: the lifting adjustment group (122) comprises an inclined installation support plate (1221), an inclined support seat (1222), an inclined placement guide seat (1223) and an adjustment motor (1224), wherein the inclined support seat (1222) is obliquely arranged on the support guide seat (6), the inclined installation support plate (1221) is arranged on the inclined support seat (1222), the adjustment motor (1224) is fixed on the lower surface of the inclined installation support plate (1221) through a fastener, and the output end of the adjustment motor (1224) penetrates through a circular through hole of the inclined installation support plate (1221) to be connected with the lower surface of the inclined placement guide seat (1223).

4. An automatic end plate butt joint and welding apparatus according to claim 3, wherein: one end of the inclined placement guide seat (1223) is provided with a guide square tube, and the guide square tube is sleeved with a square through hole on the inclined installation support plate (1221).

5. An automatic end plate butt joint and welding apparatus according to claim 3, wherein: the upper surface of oblique installation extension board (1221) sets up a support seat, a side of support seat is provided with the guide holder of slope placement guide holder (1223), a side of guide holder is provided with deep floor, another side of guide holder sets up the slip direction cassette that agrees with the scale of slope placement guide holder (1223).

6. An automatic end plate butt joint and welding apparatus according to claim 1, wherein: the grabbing group (121) comprises a mechanical arm, a pressing seat mounting plate (1211), an elastic connecting seat (1212), a pressing seat (1213) and an intermediate connecting plate (1214), wherein the output end of the mechanical arm is connected with the pressing seat mounting plate (1211), the elastic connecting seat (1212) is symmetrically arranged at two ends of the pressing seat mounting plate (1211), the end part of the elastic connecting seat (1212) is connected with the intermediate connecting plate (1214), and the lower surface of the intermediate connecting plate (1214) is provided with the pressing seat (1213).

7. An automatic end plate butt joint and welding apparatus according to claim 1, wherein: the movable set (13) comprises a movable motor (131), a driving guide wheel (132) and an auxiliary guide wheel (133), wherein the driving guide wheel (132) is arranged at the output end of the movable motor (131), the auxiliary guide wheel (133) is positioned at one side of the driving guide wheel (132), and the driving guide wheel (132) and the auxiliary guide wheel (133) are meshed with the rack (42).

8. An automatic end plate butt joint and welding apparatus according to claim 2, wherein: guide wheels are arranged on the underframe mounting plate (5) and the lower bottom plate (24), and the guide wheels are arranged on the base ground rail (4) in a rolling mode.

9. An automatic end plate butt joint and welding apparatus according to claim 1, wherein: the base ground rail (4) is composed of a frame body support (41), racks (42), rack mounting plates (43) and fixed mounting seats (44), wherein the rack mounting plates (43) are located in the middle of the frame body formed by the frame body support (41), the racks (42) are located on the frame body formed by the rack mounting plates (43) and the frame body support (41), and the fixed mounting seats (44) are symmetrically arranged on the front side and the rear side of the frame body support (41).