CN215907883U - Main arm with folding structure and tunnel arch centering machine - Google Patents

Abstract

The utility model provides a main arm with a folding structure and a tunnel arch machine, wherein the main arm comprises a first connecting arm, a telescopic arm, a second connecting arm, a mounting table and a supporting table, the first end of the first connecting arm is connected with a base of the arch machine, the second end of the first connecting arm is hinged with the first end of the telescopic arm, the second end of the telescopic arm is provided with a rotating seat, the first end of the second connecting arm is rotatably arranged on the rotating seat, the second end of the second connecting arm is connected with the mounting table, the supporting table is rotatably arranged on the mounting table, the first connecting arm can be stacked on the base of the arch machine and stacked on the first connecting arm, the telescopic arm can retract, the second connecting arm can rotate to drive the mounting table to be stacked on the telescopic arm, the supporting table is rotatably stacked on the mounting table, so that the folding of the whole main arm is completed, the volume of the main arm is reduced, and the arch can still be mounted on the supporting table under the folding state, the whole height is lower, and the potential safety hazard can be reduced and the safety can be improved through roads with various height limits.

Description

Main arm with folding structure and tunnel arch centering machine

Technical Field

The utility model relates to the technical field of tunnel construction equipment, in particular to a main arm with a folding structure and a tunnel arch erection machine.

Background

In the construction process of the tunnel, an arc-shaped arch frame made of I-steel is needed to support the tunnel which is just excavated, or an arc-shaped grille arch frame made of deformed steel bars is used to support the tunnel which is just excavated. The existing arch centering is usually constructed after clamping the arch centering by an arch centering machine, a manipulator is arranged at the tail end of an arm support, and a single arch centering section is grabbed by the manipulator to carry out artificial construction. Although this arrangement uses machinery instead of labor, it does not provide a great improvement in efficiency and safety.

And a part of arch frame machines adopt a straight plate supporting type structure to grab the arch frame, namely, the prefabricated arch frame is hoisted to a mounting table at the tail end of the main arm frame through an overhead traveling crane in a manufacturing workshop, the arch frame is fixed and clamped through expansion mechanisms at two ends of the mounting table, and then the arch frame vehicle is driven into the tunnel for construction.

The main arm of the existing arch centering machine is usually in a single-connecting-arm structure, so that the installation volume of the main arm is increased, when an arch centering is conveyed, the arch centering is installed on an installation platform of the main arm, the size of the whole tunnel arch centering machine is larger due to the arch centering and the main arm, workers are difficult to judge the length of the arch centering, and an arch centering vehicle with the arch centering is difficult to pass through when passing through a narrow or limited-height road.

Therefore, improvements are needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a main arm with a folding structure and a tunnel arch machine, which can be folded and reduce the installation volume of the main arm.

In order to achieve the above object, the present invention provides a main arm with a folding structure, which includes a first connecting arm, a telescopic arm, a second connecting arm, a mounting table and a pallet, wherein a first end of the first connecting arm is connected to a base of an arch erecting machine, a second end of the first connecting arm is hinged to a first end of the telescopic arm, a rotating base is mounted at a second end of the telescopic arm, a first end of the second connecting arm is rotatably mounted on the rotating base, a second end of the second connecting arm is connected to the mounting table, and the pallet is rotatably mounted above the mounting table.

In a further technical scheme, the first connecting arm comprises a mounting seat, a first connecting rod mechanism and a first connecting seat, the mounting seat is connected with a base of the arch truss machine, a first end of the first connecting rod mechanism is connected with the mounting seat, and a second end of the first connecting rod mechanism is connected with the first connecting seat.

In a further technical scheme, the first connecting rod mechanism comprises a first connecting rod, a second connecting rod and a first telescopic oil cylinder, two ends of the first connecting rod are respectively connected with the mounting seat and the first connecting seat, two ends of the second connecting rod are respectively connected with the mounting seat and the first connecting seat, the first telescopic oil cylinder is mounted on the mounting seat, and an output shaft of the first telescopic oil cylinder is connected with the first connecting rod or the second connecting rod.

In a further technical scheme, the telescopic arm comprises a telescopic mechanism, a first sleeve arm, a second sleeve arm and a third sleeve arm, the first sleeve arm is sleeved on the second sleeve arm, the second sleeve arm is sleeved on the third sleeve arm, the telescopic mechanism is installed on the first sleeve arm, and an output shaft of the telescopic mechanism is connected with the second sleeve arm and/or the third sleeve arm;

when the telescopic mechanism is retracted, the first sleeve arm wraps the second sleeve arm, the second sleeve arm wraps the third sleeve arm, when the telescopic mechanism is extended, the third sleeve arm is exposed out of the second sleeve arm, and the second sleeve arm is exposed out of the first sleeve arm;

the second end of the telescopic arm is provided with a leveling mechanism, and the output end of the leveling mechanism abuts against the rotating seat;

the leveling mechanism comprises a leveling oil cylinder and a sensor, the rotating base is provided with a small arm, the third sleeve arm is pivoted with the small arm, the first end of the leveling oil cylinder is connected with the third sleeve arm, the second end of the leveling oil cylinder is connected with the small arm, the sensor is installed on the small arm, a rotary drive is arranged between the small arm and the installing base, and the rotary drive is used for driving the installing base to rotate relative to the upper end face of the small arm;

the flexible hydro-cylinder of second is installed to first link arm, the flexible hydro-cylinder of second the output shaft with the connection of flexible arm, when the flexible hydro-cylinder of second extends gradually, the contained angle between first link arm and the flexible arm grow gradually, when the flexible hydro-cylinder of second retracts gradually, the contained angle between first link arm and the flexible arm diminishes gradually.

In a further technical scheme, the second connecting arm comprises a second connecting seat and a second connecting rod mechanism, the second connecting seat is rotatably installed at the top of the rotating seat, a first end of the second connecting rod mechanism is connected with the second connecting seat, and a second end of the second connecting rod mechanism is connected with the installation table.

In a further technical scheme, the second link mechanism comprises a third connecting rod, a fourth connecting rod and a fourth telescopic oil cylinder, two ends of the third connecting rod are respectively connected with the second connecting seat and the mounting table, the fourth telescopic oil cylinder is mounted at the joint of the mounting table and the third connecting rod, and an output shaft of the fourth telescopic oil cylinder abuts against the joint of the second connecting seat and the fourth connecting rod.

In a further technical scheme, expansion mechanisms used for clamping the arch centering are respectively installed on two sides of the supporting platform, and the supporting platform is of a trapezoidal or arched or arc structure.

In a further technical scheme, the saddle hangs a hanging flower basket, and the cassette is installed to the saddle, and a fixed pin is installed to the upper end of cassette, and open the lower tip of cassette has a fixed slot, and a buckle is installed in one side rotation of fixed slot, and the hanging flower basket is provided with the fixed block, and open the upper end of fixed block has a draw-in groove, and the draw-in groove is connected with the fixed pin, and the lower tip of fixed block is provided with a fixture block, and the fixture block supports in the fixed slot, buckle and fixture block joint.

The utility model provides a tunnel arch-erecting machine in a second aspect, which comprises a chassis, an auxiliary arm and a main arm, wherein wheels are installed at the bottom of the chassis.

Compared with the prior art, the utility model has the following technical effects: according to the main arm with the folding structure, the first connecting arm can be stacked on the base of the arch frame machine, the telescopic arm is stacked above the first connecting arm and can be retracted, the second connecting arm can rotate to drive the mounting table to be stacked above the telescopic arm, and the support table can also rotate to be stacked above the mounting table, so that the whole main arm is folded, the size of the main arm is reduced, the arch frame can still be mounted on the support table in the folded state, the overall height is low, potential safety hazards can be reduced through various height-limiting roads, and the safety is improved.

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 view of the structure of the main arm of the present invention.

Fig. 2 is a schematic view of the folded state of the main arm of the present invention.

Fig. 3 is a partial structural schematic view of the hanging basket suspended on the main arm.

Fig. 4 is a schematic structural diagram of the fixing block and the clamping seat.

Fig. 5 is a schematic structural view of the fixing block.

Fig. 6 is a schematic structural view of the gantry.

Fig. 7 is another schematic view of the gantry.

Fig. 8 is a schematic view of the arch machine after folding the pick-up arch.

Wherein: 1-a first connecting arm, 11-a mounting seat, 12-a first connecting rod mechanism, 121-a first connecting rod, 122-a second connecting rod, 123-a first telescopic oil cylinder, 13-a first connecting seat and 14-a second telescopic oil cylinder;

2-telescopic arm, 21-leveling mechanism, 22-first set of arm, 23-second set of arm, 24-third set of arm and 25-rotating seat;

3-a second connecting arm, 31-a second connecting seat, 32-a second connecting rod mechanism, 321-a third connecting rod, 322-a fourth connecting rod, 323-a fourth telescopic oil cylinder and 33-a mounting table;

4-a supporting table, 41-an expansion mechanism, 42-a clamping seat, 421-a fixing pin, 422-a fixing groove and 423-a buckle;

5-auxiliary arm;

6-a chassis;

7-hanging basket, 71-fixing block, 72-clamping groove and 73-clamping block;

8-main arm;

9-vehicle wheels;

10-arch centering.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

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

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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.

Example one

Please refer to fig. 1-8;

the utility model provides a main arm with beta structure, including first linking arm 1, flexible arm 2, second linking arm 3, mount table 33 and saddle 4, the first end of first linking arm 1 is connected with the base of bow member 10 machine, the second end of first linking arm 1 is articulated with the first end of flexible arm 2, a roating seat 25 is installed to the second end of flexible arm 2, the first end rotation of second linking arm 3 is installed in roating seat 25, the second end and the mount table 33 of second linking arm 3 are connected, saddle 4 rotation mounting is in the top of mount table 33.

First linking arm 1 can stack the base in bow member 10 machine, and stack flexible arm 2 in first linking arm 1 top, flexible arm 2 can contract back, second linking arm 3 can rotate and drive mount table 33 and stack in the top of flexible arm 2, saddle 4 also can rotate and stack in the top of mount table 33, thereby accomplish the folding of whole main arm 8, reduce main arm 8's volume, and under fold condition, bow member 10 still can be installed on saddle 4, holistic height is all lower, can pass through the road of multiple limit for height, reduce the potential safety hazard, and the security is improved.

In other specific embodiments, further, the first connecting arm 1 includes a mounting seat 11, a first link mechanism 12 and a first connecting seat 13, the mounting seat 11 is connected to the base of the arch 10, a first end of the first link mechanism 12 is connected to the mounting seat 11, and a second end of the first link mechanism 12 is connected to the first connecting seat 13. The first connecting rod mechanism 12 includes a first connecting rod 121, a second connecting rod 122 and a first telescopic cylinder 123, two ends of the first connecting rod 121 are respectively connected with the mounting seat 11 and the first connecting seat 13, two ends of the second connecting rod 122 are respectively connected with the mounting seat 11 and the first connecting seat 13, the first telescopic cylinder 123 is mounted on the mounting seat 11, and an output shaft of the first telescopic cylinder 123 is connected with the first connecting rod 121 or the second connecting rod 122.

As a preferred embodiment, the connection relationship between the first connecting rod 121 and the second connecting rod 122 and the mounting seat 11 in this embodiment is hinged, the first connecting arm 1 is driven by the first link mechanism 12 to perform a morphological change, when the first telescopic cylinder 123 extends, the first connecting rod 121 and the second connecting rod 122 rotate counterclockwise around the mounting seat 11 under the push of the first telescopic cylinder 123, and the angle between the first connecting arm 1 and the base of the arch frame 10 gradually increases; when the first telescopic cylinder 123 retracts, the first connecting rod 121 and the second connecting rod 122 are driven by the first telescopic cylinder 123 to rotate clockwise around the mounting base 11, and the angle between the first connecting arm 1 and the base of the arch frame 10 is gradually reduced, so that a folded state is formed, and the size of the main arm 8 is reduced.

In other specific embodiments, further, the telescopic arm 2 includes a telescopic mechanism, a first set of arms 22, a second set of arms 23, and a third set of arms 24, the first set of arms 22 is sleeved on the second set of arms 23, the second set of arms 23 is sleeved on the third set of arms 24, the telescopic mechanism is mounted on the first set of arms 22, and an output shaft of the telescopic mechanism is connected with the second set of arms 23 and/or the third set of arms 24;

when the telescopic mechanism is retracted, the first set of arms 22 wraps the second set of arms 23, the second set of arms 23 wraps the third set of arms 24, and when the telescopic mechanism is extended, the third set of arms 24 is exposed out of the second set of arms 23, and the second set of arms 23 is exposed out of the first set of arms 22.

As a preferred embodiment, the telescopic mechanism of the present embodiment uses an oil cylinder, and the telescopic arm 2 can be retracted and extended by the oil cylinder, so as to reduce the volume of the telescopic arm 2. The telescopic mechanism of the embodiment can be installed in the first sleeve arm and also can be installed outside the first sleeve arm.

The second end of the telescopic arm 2 is provided with a leveling mechanism, and the output end of the leveling mechanism is propped against the rotating seat 25;

the leveling mechanism comprises a leveling oil cylinder 21 and a sensor, a small arm is arranged on the rotating base 25, the third sleeve arm 24 is pivoted with the small arm, the first end of the leveling oil cylinder 21 is connected with the third sleeve arm 24, the second end of the leveling oil cylinder 24 is connected with the small arm, the sensor is installed on the small arm, a rotary drive is arranged between the small arm and the mounting base 25, and the rotary drive is used for driving the mounting base 25 to rotate relative to the upper end face of the small arm;

when the sensor detects that the angle of the small arm changes, the angle of the small arm and the third set of arm is adjusted through the stretching of the leveling oil cylinder 21 until the upper end face of the small arm is parallel to the horizontal plane. In other specific embodiments, further, the first connecting arm 1 is provided with a second telescopic cylinder 14, and an output shaft of the second telescopic cylinder 14 is connected to the telescopic arm 2, when the second telescopic cylinder 14 is gradually extended, an included angle between the first connecting arm 1 and the telescopic arm 2 is gradually increased, and when the second telescopic cylinder 14 is gradually retracted, an included angle between the first connecting arm 1 and the telescopic arm 2 is gradually decreased.

Through the angle between the flexible hydro-cylinder 14 control first connecting arm 1 of second and the flexible arm 2, when the angle shrinks, the second end of flexible arm 2 descends gradually and is close first connecting arm 1, and when the angle grow, flexible arm 2 leaves first connecting arm 1 gradually, and the second end of flexible arm 2 rises gradually. The second end of the telescopic arm 2 is movable up and down by the second telescopic cylinder 14.

In other embodiments, further, the second connecting arm 3 includes a second connecting seat 31 and a second link mechanism 32, the second connecting seat 31 is rotatably mounted on the top of the rotating seat 25, a first end of the second link mechanism 32 is connected to the second connecting seat 31, and a second end of the second link mechanism 32 is connected to the mounting platform 33.

The second connecting arm 3 is translated relative to the second end of the telescopic arm 2 by the rotating base 25, and the mount table 33 can be always kept parallel to the ground by the second connecting rod 122.

In other specific embodiments, further, the second link mechanism 32 includes a third connecting rod 321, a fourth connecting rod 322, and a fourth telescopic cylinder 323, two ends of the third connecting rod 321 are respectively connected to the second connecting seat 31 and the mounting platform 33, the fourth telescopic cylinder 323 is mounted at a connection position between the mounting platform 33 and the third connecting rod 321, and an output shaft of the fourth telescopic cylinder 323 abuts against a connection position between the second connecting seat 31 and the fourth connecting rod 322.

As a preferable embodiment, the connection relationship between the third connecting rod 321 and the fourth connecting rod 322 and the second connecting seat 31 is hinged, the connection relationship between the third connecting rod 321 and the fourth connecting rod 322 and the mounting platform 33 is hinged, the whole second connecting arm 3 is driven by the second link mechanism 32 to change the shape, when the fourth telescopic cylinder 323 extends, the third connecting rod 321 and the fourth connecting rod 322 rotate clockwise around the second connecting seat 31 under the pushing of the fourth telescopic cylinder 323, and the angle between the second connecting arm 3 and the rotating seat 25 gradually increases; when the fourth telescopic cylinder 323 retracts, the third connecting rod 321 and the fourth connecting rod 322 are driven by the fourth telescopic cylinder 323 to rotate around the second connecting seat 31 counterclockwise, and the angle between the second connecting arm 3 and the second connecting seat 31 becomes smaller gradually. The position of the mount table 33 is adjusted by the fourth telescopic cylinder 323, and the mount table 33 is always kept parallel to the floor surface when moving by the second link mechanism 32.

In other embodiments, further, the two sides of the pallet 4 are respectively provided with an expansion mechanism 41 for clamping the arch 10, and the pallet 4 has a trapezoidal or arched or arc structure.

Conventionally, a plurality of arches 10 are generally hoisted by a crown block to above the pallet 4, and the arches 10 are clamped by a tightening mechanism 41.

As a preferred embodiment, the pallet 4 of this embodiment is of a trapezoidal structure, the space between the pallet 4 and the arch frame 10 can be fully utilized through the pallet 4 of a trapezoidal structure, the height required for mounting the pallet 4 is reduced, the space utilization rate is improved, the arch frame 10 can be directly clamped through the clamping platform of a trapezoidal structure, the overhead crane is not required to hoist, the construction time is reduced, the construction efficiency is improved, and the construction cost is reduced.

In other embodiments, further, a hanging basket 7 is suspended on the tray table 4, the tray table 4 is provided with a clamping seat 42, the upper end of the clamping seat 42 is provided with a fixing pin 421, the lower end of the clamping seat 42 is provided with a fixing groove 422, one side of the fixing groove 422 is rotatably provided with a buckle 423, the hanging basket 7 is provided with a fixing block 71, the upper end of the fixing block 71 is provided with a clamping groove 72, the clamping groove 72 is connected with the fixing pin 421, the lower end of the fixing block 71 is provided with a clamping block 73, the clamping block 73 abuts against the fixing groove 422, and the buckle 423 is clamped with the clamping block 73.

Through the cooperation of cassette 42 and the fixed block 71 of hanging flower basket 7, make hanging flower basket 7 can be quick install on saddle 4, when installing, through the draw-in groove 72 of fixed block 71, hang fixed block 71 on the fixed pin 421 of cassette 42, in the fixture block 73 of fixed block 71 stretched into fixed slot 422, the rotatory fixture block 73 that withstands of buckle 423 again to accomplish the fixed of hanging flower basket 7.

Example two

Please refer to fig. 6-8;

the utility model provides a tunnel arch-erecting machine in a second aspect, which comprises a chassis 6, a secondary arm 5 and a primary arm 8, wherein wheels 9 are mounted at the bottom of the chassis 6.

The arch centering machine can be folded after the arch centering 10 is picked up, so that the volume of the arch centering machine is reduced, the arch centering machine can be moved more conveniently, and potential safety hazards are reduced.

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 utility model. 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 above, 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 within the scope of the present invention.

Claims (10)

1. The utility model provides a main arm with beta structure which characterized in that: including first linking arm, flexible arm, second linking arm, mount table and saddle, the first end of first linking arm is connected with the base of bow member machine, the second end of first linking arm with the first end of flexible arm is articulated, a roating seat is installed to the second end of flexible arm, the first end rotation of second linking arm install in the roating seat, the second end of second linking arm with the mount table is connected, the saddle rotation install in the top of mount table.

2. A main arm with a concertina structure as claimed in claim 1, wherein: the first connecting arm comprises a mounting seat, a first connecting rod mechanism and a first connecting seat, the mounting seat is connected with the base of the arch truss machine, the first end of the first connecting rod mechanism is connected with the mounting seat, and the second end of the first connecting rod mechanism is connected with the first connecting seat.

3. A main arm with a folding structure according to claim 2, wherein: the first connecting rod mechanism comprises a first connecting rod, a second connecting rod and a first telescopic oil cylinder, two ends of the first connecting rod are respectively connected with the mounting seat and the first connecting seat, two ends of the second connecting rod are respectively connected with the mounting seat and the first connecting seat, the first telescopic oil cylinder is mounted on the mounting seat, and an output shaft of the first telescopic oil cylinder is connected with the first connecting rod or the second connecting rod.

4. A main arm with a folding structure according to claim 2, wherein: the telescopic arm comprises a telescopic mechanism, a first sleeve arm, a second sleeve arm and a third sleeve arm, the first sleeve arm is sleeved on the second sleeve arm, the second sleeve arm is sleeved on the third sleeve arm, the telescopic mechanism is arranged on the first sleeve arm, and an output shaft of the telescopic mechanism is connected with the second sleeve arm and/or the third sleeve arm; the second end of the telescopic arm is provided with a leveling mechanism, and the output end of the leveling mechanism abuts against the rotating seat;

the leveling mechanism comprises a leveling oil cylinder and a sensor, the rotating base is provided with a small arm, the third sleeve arm is pivoted with the small arm, the first end of the leveling oil cylinder is connected with the third sleeve arm, the second end of the leveling oil cylinder is connected with the small arm, the sensor is installed on the small arm, a rotary drive is arranged between the small arm and the installing base, and the rotary drive is used for driving the installing base to rotate relative to the upper end face of the small arm;

when the telescopic mechanism is retracted, the first sleeve arm wraps the second sleeve arm, the second sleeve arm wraps the third sleeve arm, when the telescopic mechanism is extended, the third sleeve arm is exposed out of the second sleeve arm, and the second sleeve arm is exposed out of the first sleeve arm.

5. A main arm with a concertina structure as claimed in claim 1, wherein: the flexible hydro-cylinder of second is installed to first link arm, the flexible hydro-cylinder of second the output shaft with the connection of flexible arm, when the flexible hydro-cylinder of second extends gradually, the contained angle between first link arm and the flexible arm grow gradually, when the flexible hydro-cylinder of second retracts gradually, the contained angle between first link arm and the flexible arm diminishes gradually.

6. A main arm with a concertina structure as claimed in claim 1, wherein: the second connecting arm comprises a second connecting seat and a second connecting rod mechanism, the second connecting seat is rotatably installed at the top of the rotating seat, the first end of the second connecting rod mechanism is connected with the second connecting seat, and the second end of the second connecting rod mechanism is connected with the mounting table.

7. A main arm with a folding structure according to claim 6, wherein: the second connecting rod mechanism comprises a third connecting rod, a fourth connecting rod and a fourth telescopic oil cylinder, the two ends of the third connecting rod are respectively connected with the second connecting seat and the mounting table, the fourth telescopic oil cylinder is mounted at the joint of the mounting table and the third connecting rod, and an output shaft of the fourth telescopic oil cylinder abuts against the joint of the second connecting seat and the fourth connecting rod.

8. A main arm with a concertina structure as claimed in claim 1, wherein: and the two sides of the supporting platform are respectively provided with an expansion mechanism for clamping the arch centering, and the supporting platform is in a trapezoidal or arched or arc structure.

9. A main arm with a concertina structure as claimed in claim 1, wherein: the hanging bracket is hung with a hanging flower basket, and the cassette is installed to the saddle, and a fixed pin is installed to the upper end of cassette, and open the lower tip of cassette has a fixed slot, and a buckle is installed in one side rotation of fixed slot, and the hanging flower basket is provided with the fixed block, and open the upper end of fixed block has a draw-in groove, and the draw-in groove is connected with the fixed pin, and the lower tip of fixed block is provided with a fixture block, and the fixture block supports in the fixed slot, buckle and fixture block joint.

10. A tunnel bow member machine which characterized in that: comprising a chassis, a secondary arm and a primary arm as claimed in claims 1-9, wherein wheels are mounted on the bottom of the chassis.

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