CN217813470U - Arch erecting machine with underdigging processing function - Google Patents

Abstract

The utility model discloses an arch erecting machine with undermining processing function, which comprises a chassis, a traveling mechanism and a working arm, wherein the working arm is arranged on the chassis, and the arch erecting machine also comprises an undermining component arranged at the tail end of one of the working arms; the underdigging assembly comprises a base, a rear arm, a front arm and a crushing device which are sequentially connected; the base is fixed at the tail end of the working arm, and the rear arm is hinged to the base and can perform pitching motion relative to the hinged point; the front arm is hinged at the front end part of the rear arm and can swing relative to the hinged point; the crushing device is arranged at the front end part of the front arm; when the arch support works, the back arm can move vertically in a pitching manner, and the front arm can swing back and forth, so that the back arm can carry out back-digging treatment on the tunnel face from different angles, the arch support meets the condition of erecting an arch, and smooth and efficient arch support operation is ensured.

Description

Arch erecting machine with underdigging processing function

Technical Field

The utility model relates to a tunnel construction equipment technical field especially relates to an arch erecting machine with owe dig processing function.

Background

The mountain tunnel construction method in China is mainly based on a drilling and blasting method, and when surrounding rocks are weak and broken seriously and have poor self-stability, a steel arch frame is required to be adopted for primary support in time so as to ensure the construction safety. In the current tunnel construction process, mechanization of arch installation has become a trend. During construction, a plurality of steel arch frames are assembled outside the tunnel, and then the assembled steel arch frames are transported to a tunnel face through a multifunctional arch frame assembling machine to be assembled and supported. The assembled forming arch frame is used in the mechanized operation process, so the size requirement on the excavation surface is strict. If the tunnel is underexcavated (the size of the peripheral excavation surface of the section is smaller than the set size), the arch frame cannot be installed, or the size after installation cannot meet the construction requirement, so that the problems of low construction efficiency and poor construction quality occur.

In view of the above, a new technical solution is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an arching machine with insufficient excavation processing function aims at solving the technical problem of the unable adaptation shaping arching machine size of tunnel undermining section.

In order to achieve the above object, the utility model adopts the following technical means:

an arch erecting machine with an undermining treatment function comprises a chassis, a traveling mechanism and working arms, wherein the working arms are arranged on the chassis, and the arch erecting machine also comprises an undermining assembly arranged at the tail end of one of the working arms;

the underdigging assembly comprises a base, a rear arm, a front arm and a crushing device which are sequentially connected;

the base is fixed at the tail end of the working arm, and the rear arm is hinged to the base and can perform pitching motion relative to the hinged point; the front arm is hinged at the front end part of the rear arm and can swing relative to the hinged point; the crushing device is arranged at the front end part of the front arm;

during operation, the undermining assembly is used for undermining the tunnel face under the drive of the working arm.

As a further improvement, the rear end of the rear arm is hinged to the top of the base, and a first driving piece is installed between the middle of the rear arm and the bottom of the base and used for driving the rear arm to pitch up and down relative to the base.

As a further improvement, the rear end of the front arm protrudes to one side to form an extension part, the extension part is hinged to the front end of the rear arm, and a second driving part is installed between the rear end of the front arm and the rear arm and used for driving the front arm to swing back and forth relative to the rear arm.

As a further improvement, a first connecting rod and a second connecting rod are further arranged between the front arm and the rear arm, one end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the first connecting rod is hinged to the front end of the rear arm, the other end of the second connecting rod is hinged to the rear end of the front arm, and a hinged shaft of the first connecting rod and the second connecting rod is hinged to the movable end of the second driving piece.

As a further improvement, the first connecting rod and the second connecting rod are both arc-shaped.

As a further improvement, a first rotation driving device is arranged between the base and the rear arm, and the first rotation driving device is used for driving the rear arm to do pitching motion relative to the base; a second rotary driving device is arranged between the rear arm and the front arm and is used for driving the front arm to swing back and forth relative to the rear arm;

alternatively, the crushing device is arranged to be telescopically connected back and forth in the forearm along the length direction of the forearm.

As a further improvement, the working arm comprises a rotating seat and a telescopic arm hinged on the rotating seat, the tail end of the telescopic arm is provided with a rotating platform, and the rotating platform is provided with a working platform;

the base of the underdigging assembly is fixedly connected to the working platform.

As a further improvement, the tail end of the telescopic arm is pivoted with a small arm, and the small arm can swing left and right in the horizontal direction along a vertical shaft;

the rotating platform is arranged at the tail end of the small arm.

As a further improvement, a four-bar linkage structure is arranged between the small arm and the telescopic arm, and comprises a front connecting piece, a rear connecting piece, four connecting bars and a third driving piece;

the rear connecting piece is connected to the front end of the telescopic arm, and the front connecting piece is connected to the rear end of the small arm;

the four connecting rods are divided into two groups, and are connected on the outer sides of the front connecting piece and the rear connecting piece in a left-right mode, and the two connecting rods in the same group, the front connecting piece and the rear connecting piece form a parallelogram; and two ends of the third driving piece are respectively hinged on the front connecting piece and the rear connecting piece and are positioned on the diagonal line of the parallelogram.

As a further improvement, the tail end of the telescopic arm is provided with a connecting pin which slantingly protrudes towards the upper front part of the telescopic arm;

the rear connecting piece is provided with a convex angle which is pivoted with the connecting pin, and a fourth driving piece is arranged between the rear connecting piece and the end part of the telescopic arm.

Compared with the prior art, the utility model discloses bring following technological effect:

the utility model discloses an arching machine sets up the undermining subassembly at the end of one of them work arm, and this undermining subassembly includes base, postbrachium, forearm and breaker, and at the during operation, whole undermining subassembly moves along with the work arm together, and pitching motion, forearm can be done to wherein the postbrachium about the postbrachium, therefore this undermining subassembly can follow different angles and carry out the undermining to the face and handle, makes its condition that satisfies the arch frame of erectting to ensure the smooth of arching operation, high-efficient developing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 showing the construction state of the present invention in a tunnel;

fig. 2 shows a structure diagram of an arch erecting machine with under-cut processing function according to the present invention;

FIG. 3 shows a partial enlarged view at A in FIG. 2;

fig. 4 shows a schematic structural view of a first working state of the undermining assembly of the present invention;

fig. 5 shows a schematic structural view of a second working state of the undermining assembly of the present invention;

FIG. 6 is a schematic structural view illustrating a third operating state of the undermining assembly of the present invention;

fig. 7 shows the utility model discloses a motor drive's owing subassembly's schematic structure.

The reference numbers illustrate:

a chassis-1; a traveling mechanism-2; undermining component-3; a base-31; a rear arm-32; a ridge-321; a forearm-33; an extension-331; a crushing device-34; a first drive cylinder-35; a second drive cylinder-36; a first link-37; a second link-38; a first slew drive-391; a second slew drive-392; a main arm-41; an auxiliary arm-42; a telescopic arm-43; a connecting pin-431; a folding arm-44; clamping a tray-45; a work platform-46; a towing mechanism-47; a rotating table-48; a forearm-49; four bar linkage-50; front connector-51; rear connector-52; lobe-521; a connecting rod-53; a third drive cylinder-54; a fourth driving oil cylinder-55.

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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

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.

Example one

Referring to fig. 1-2, the present invention provides an arch erecting machine with underdigging processing function, which comprises a chassis 1, a traveling mechanism 2, a working arm and an underdigging assembly 3.

Specifically, in this embodiment, the working arm includes two types: the main arm 41 is provided with one main arm 41 and the auxiliary arm 42 is positioned in the middle of the chassis 1; the two sub-arms 42 are provided, respectively on both sides of the main arm 41. The working arms each comprise a rotating base and a telescopic arm 43 connected to the rotating base. The main arm 41 is further provided with a folding arm 44, the folding arm 44 is connected to the rotary base, the folding arm 44 can pitch at an angle of 0-90 degrees relative to the chassis 1, and the telescopic arm 43 of the main arm 41 is connected to the tail end of the folding arm 44, so that the main arm 41 can obtain a larger and more flexible working space. It should be mentioned that a pitching cylinder is arranged between the telescopic arm 43 and the rotary base, the pitching cylinder drives the telescopic arm 43 to implement pitching motion, and the setting is not described any more; the gyration seat can drive whole work arm and realize the gyration, and the structure and the installation of gyration seat all belong to prior art, and this embodiment is no longer described any more.

Specifically, in the process of installing the arch centering, the main arm 41 is responsible for erecting the arch centering at the top of the tunnel, and the auxiliary arm 42 is responsible for erecting the arch centering at two sides of the tunnel, so that the tail end of the main arm 41 is also provided with a clamping tray 45, and the clamping tray 45 is used for lifting the arch centering from bottom to top to a preset position at the top of the tunnel; the tail end of the auxiliary arm 42 is provided with a working platform 46, a towing mechanism 47 is arranged on the working platform 46, the towing mechanism 47 is used for hoisting the arch to the preset positions on the two sides of the tunnel, and an operator stands on the working platform 46 for construction to assist the main arm 41 and the auxiliary arm 42 in arch erecting operation.

Referring to fig. 4-6, in the present embodiment, the undermining assembly 3 is mounted on the working platform 46, and specifically, the undermining assembly 3 includes a base 31, a rear arm 32, a front arm 33 and a crushing device 34.

The base 31 is fixed on the working platform 46 and can move along with the working platform 46; the rear arm 32 is hinged on the base 31 and can do up-and-down pitching motion relative to the hinged point; the front arm 33 is hinged at the front end part of the rear arm 32 and can swing back and forth relative to the hinged point; the crushing device 34 is mounted at the front end of the front arm 33, and the crushing device 34 adopts an existing crushing hammer or crushing pick, which is a mature product, and the detailed description of the embodiment is omitted.

The crushing device 34 is a main working component of the undermining assembly 3, and the crushing device 34 can move in one degree of freedom under the driving of the front arm 33 and the rear arm 32 from a local view.

Further, in this embodiment, a rotary table 48 is provided between the working platform 46 and the end of the sub-arm 42, so that the working platform 46 together with the undermining assembly 3 can rotate around the axis of the rotary table 48, thereby adding a degree of freedom to the movement of the crushing device 34.

Meanwhile, the undermining assembly 3 and the working platform 46 are both mounted at the end of the auxiliary arm 42 and thus can move together with the auxiliary arm 42, and since the auxiliary arm 42 can be integrally rotated and extended, a degree of freedom of movement is added to the crushing device 34.

In summary, the arch erecting machine is provided with the back digging assembly 3 at the tail end of one of the working arms, the back digging assembly 3 comprises a base 31, a rear arm 32, a front arm 33 and a crushing device 34, when in work, the rear arm 32 can do up-and-down pitching motion, the front arm 33 can do front-and-back swinging motion, the whole back digging assembly 3 can also move along with the working arms, so that the crushing device 34 can carry out back digging treatment on the face from different angles, the arch erecting condition can be met, and the smooth and efficient development of arch erecting operation can be ensured. The arch erecting machine is particularly suitable for tunnel construction occasions mainly based on a drilling and blasting method, so that the phenomenon of underexcavation of a tunnel excavation section under the circumstances is very common, if underexcavation processing is carried out by the method in the prior art, additional underexcavation engineering machinery is needed, the construction cost is improved, and narrow space in the tunnel is not convenient for two machines to simultaneously carry out operation, only alternate operation can be carried out, and the construction period is delayed. The underdigging component 3 of the arch erecting machine is a relatively independent structural module, and the assembly of the underdigging component 3 can be quickly realized and the underdigging processing function can be realized on the premise that the original arch erecting machine is not changed too much.

In the embodiment, the rear arm 32 has a long strip structure, the rear end of the rear arm 32 is hinged to the top of the base 31, and a first driving cylinder 35 is installed between the middle of the rear arm 32 and the bottom of the base 31, and the first driving cylinder 35 makes a telescopic motion, so that the rear arm 32 can be driven to pitch up and down relative to the base 31.

In this embodiment, the rear end of the front arm 33 protrudes to one side to form an extension 331, the extension 331 is hinged at the front end of the rear arm 32, and a second driving cylinder 36 is installed between the rear end of the front arm 33 and the rear arm 32, and the second driving cylinder 36 extends and retracts, so that the front arm 33 can be driven to swing back and forth relative to the rear arm 32. Preferably, the included angle between the central line of the extension 331 and the central line of the front arm 33 is an obtuse angle, and the configuration can make the front arm 33 swing more smoothly under the driving of the second driving cylinder 36.

Preferably, a first connecting rod 37 and a second connecting rod 38 are further disposed between the front arm 33 and the rear arm 32, one end of the first connecting rod 37 and one end of the second connecting rod 38 are hinged to each other, the other end of the first connecting rod 37 is hinged to the front end of the rear arm 32, the other end of the second connecting rod 38 is hinged to the rear end of the front arm 33, and the hinged shaft of the first connecting rod 37 and the second connecting rod 38 is hinged to the movable end of the second driving cylinder 36. The addition of the first connecting rod 37 and the second connecting rod 38 can make the front arm 33 obtain a larger swing amplitude, thereby being beneficial to the crushing device 34 to more flexibly perform underdigging treatment on the excavated section. Preferably, the first link 37 and the second link 38 are both arc-shaped, which further increases the swing amplitude of the forearm 33.

Preferably, a raised portion 321 is formed at the middle part of the rear arm 32 and protrudes upward, and the fixed end of the second driving cylinder 36 is hinged to the raised portion 321, so that the driving torque of the second driving cylinder 36 on the front arm 33 can be increased, and the front arm 33 can move more quickly and save oil.

Three typical operating conditions for the undermining assembly 3, with the work platform 46 as a reference point, are described below:

referring to fig. 4, the first working condition is the fully forward extended condition of the undermining assembly 3, and at this time, the first and second actuating cylinders 35 and 36 are both retracted to the shortest limit position, so that the front arm 33 and the crushing device 34 can obtain the maximum opening angle in the forward direction, and can be used for undermining the front excavation section.

Referring to fig. 5, the second working condition is the fully extended condition of the undermining assembly 3, wherein the first actuating cylinder 35 is retracted to the limit position and the second actuating cylinder 36 is extended to the limit position, so that the forearm 33 and the crushing device 34 can obtain the maximum opening angle in the upward direction, and can be used for undermining treatment of the excavated section of the roof.

Referring to fig. 6, the third working state is a state when the underdigging assembly 3 is idle, and at this time, the first driving cylinder 35 and the second driving cylinder 36 are both at the extended extreme positions, so that the rear arm 32 is folded into the side surface of the working platform, the front arm 33 is folded and attached to the outer side of the rear arm 32, and the entire underdigging assembly 3 is accommodated in the side surface of the working platform 46.

Of course, during actual operation, the working state of the undermining assembly 3 can be in any position among the three states to meet the requirements of undermining treatment.

In addition, the crushing device 34 of the present embodiment is fixedly installed inside the front arm 33, so that the position of the crushing device along the length direction of the front arm 33 is fixed, and in other embodiments, the crushing device 34 may be further configured to be telescopically connected in the front arm 33 back and forth along the length direction of the front arm 33. For example, a slide rail and a slide groove are arranged between the crushing device 34 and the front arm 33, and the two can slide relatively; a driving device is added to push the crushing device 34 to move back and forth along the length direction, so that the applicable working condition range of the undermining assembly 3 can be further expanded.

Example two

The embodiment is to adopt the driving cylinder to drive the front arm and the rear arm to move, the cylinder belongs to a linear driving device, and according to the utility model discloses a main idea, a device with a rotation driving function can also be adopted as a driving element.

Referring to fig. 7, a schematic structural diagram of an undermining assembly driven by a rotary driving device according to the present embodiment is shown.

In the present embodiment, the undermining assembly 3 still comprises a base 31, a rear arm 32, a front arm 33 and a crushing device 34, but in terms of the specific shape and configuration, this embodiment is greatly simplified compared to the first embodiment. As shown in fig. 7, the base 31, the rear arm 32 and the front arm 33 can be simplified to be made of only one plate. A first rotation driving device 391 is arranged between the base 31 and the rear arm 32, and the first rotation driving device 391 is used for driving the rear arm 32 to rotate around a driving shaft so as to enable the rear arm 32 to do pitching motion relative to the base 31; a second rotary drive 392 is provided between the rear arm 32 and the front arm 33, and the second rotary drive 392 is used for driving the front arm 33 to rotate around the driving shaft and further to swing back and forth relative to the rear arm 32. The rotating shaft of the rotary driving device is vertical to the moving plane of the two arms, and the crushing device 34 is fixedly arranged on one side of the front arm 33.

When the device works, the first rotation driving device 391 operates to drive the rear arm 32 to do up-and-down pitching motion relative to the base 31; when the second rotary driving device 392 is operated, the front arm 33 can be driven to swing relative to the rear arm 32. The two rotary drives work in concert to achieve multiple working attitudes of the undermined assembly 3, thereby allowing the crushing device 34 to construct undermined sections from different angles.

It should be noted that the base 31 may be mounted at the end of any one of the working arms, for example, at the end of the auxiliary arm 42; if the end of the sub-arm 42 is provided with a work platform 46, the base 31 of the undermining assembly 3 may be secured to the work platform 46. The rotary driving device can adopt a motor, a rotary hydraulic cylinder and the like.

In addition, the crushing device 34 of the present embodiment may be configured to be retractable back and forth along the length of the forearm 33.

EXAMPLE III

Referring to fig. 3, on the basis of the first embodiment, the auxiliary arm 42 of the present embodiment is further provided with a small arm 49.

Specifically, a small arm 49 is pivotally connected to the distal end of the telescopic arm 43, and the small arm 49 can swing left and right in the horizontal direction along the vertical axis.

The rotating table 48 is provided at the end of the arm 49, and the working platform 46 and the underdigging assembly 3 are mounted on the rotating table 48. Therefore, when the arm 49 swings left and right, the work table 46 and the undermining assembly 3 are driven to swing left and right together, and the force application angle of the crushing device 34 is adjusted in this degree of freedom, thereby improving the undermining capability.

It should be noted that the specific technical solution provided in this embodiment is completed on the basis of the first embodiment, and since the specific technical solution has the distinguishing technical features corresponding to the first embodiment, corresponding beneficial effects will be produced, and details are not repeated herein. The arm 49 of the present embodiment is driven by a device having a turning driving function such as a motor or a turning hydraulic cylinder.

Example four

Referring to fig. 3, on the basis of the third embodiment, the auxiliary arm 42 of the present embodiment is further provided with a four-bar linkage structure 50.

Specifically, the four-bar linkage structure 50 is arranged between the small arm 49 and the telescopic arm 43, and comprises a front connecting piece 51, a rear connecting piece 52, four connecting bars 53 and a third driving oil cylinder 54; the rear connecting piece 52 is connected to the front end of the telescopic arm 43, and the front connecting piece 51 is connected to the rear end of the small arm 49; the four connecting rods 53 are divided into two groups, and are connected on the outer sides of the front connecting piece 51 and the rear connecting piece 52 in a left-right mode, and the two connecting rods 53 in the same group, the front connecting piece 51 and the rear connecting piece 52 form a parallelogram; two ends of the third driving cylinder 54 are respectively hinged on the front connecting piece 51 and the rear connecting piece 52 and are positioned on the diagonal line of the parallelogram.

In the movement process of the four-bar 53 structure, four edges are always in parallel relation, the initial position of the small arm 49 is in a horizontal state through presetting, the small arm 49 can be always kept horizontal along with the movement process of the connecting bar by means of the characteristics of a parallelogram, and therefore the working platform 46 is always ensured to be horizontal, and the construction personnel are guaranteed to stand stably.

In one preferred embodiment, the end of the telescopic arm 43 is provided with a connecting pin 431, and the connecting pin 431 obliquely protrudes to the upper front of the telescopic arm 43; the rear link 52 is provided with a convex angle 521, the convex angle 521 is pivoted with the connecting leg 431, and a fourth driving cylinder 55 is arranged between the rear link 52 and the end of the telescopic arm 43. During operation, the fourth driving cylinder 55 moves in coordination with each movement of the telescopic arm 43, so as to ensure that the working platform 46 is always kept horizontal, and thereafter, the telescopic arm 43 is positioned in the posture and does not move in pitch, so that the working platform 46 can still realize small pitch movement under the driving of the four-bar linkage structure 50, and meanwhile, the working platform 46 can be kept horizontal.

It should be noted that the specific technical solution provided in this embodiment is completed on the basis of the second embodiment, and in other embodiments, the features of the first embodiment may also be combined, and since the specific technical solution has the distinguishing technical features corresponding to the embodiments, the corresponding beneficial effects will be produced, and are not described herein again.

In the above embodiment, owing to dig subassembly 3 and install on work platform 46, and work platform 46 installs on auxiliary arm 42, and according to the utility model discloses a purpose, owing to dig subassembly 3 can also install on main arm 41, perhaps work platform 46 also can install on main arm 41, because owing to dig the loading and unloading of subassembly 3 all comparatively convenient, the user can carry out nimble setting according to the tunnel job site condition, all kinds of not breaking away from the utility model discloses a scheme should fall into the utility model discloses an in the protection scope.

The first driving cylinder 35, the second driving cylinder 36, the third driving cylinder 54 and the fourth driving cylinder 55 are driving members for providing power, and in some other embodiments, the driving members may be replaced by hydraulic cylinders, air cylinders, etc. under appropriate conditions, for example, under appropriate driving force.

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.

Claims (10)

1. An arch erecting machine with an undermining treatment function comprises a chassis, a traveling mechanism and working arms, wherein the working arms are arranged on the chassis;

the underdigging assembly comprises a base, a rear arm, a front arm and a crushing device which are sequentially connected;

the base is fixed at the tail end of the working arm, and the rear arm is hinged to the base and can perform pitching motion relative to the hinged point; the front arm is hinged at the front end part of the rear arm and can swing relative to the hinged point; the crushing device is arranged at the front end part of the front arm;

during operation, the undermining assembly is used for undermining the tunnel face under the drive of the working arm.

2. The arching machine with undermining handling function of claim 1, wherein the rear end of the rear arm is hinged to the top of the base, and a first driving member is mounted between the middle of the rear arm and the bottom of the base for driving the rear arm to pitch up and down relative to the base.

3. An arch raising machine with an undermining handling function as claimed in claim 1 or claim 2, wherein the rear end of the front arm projects to one side to form an extension which is hinged to the front end of the rear arm, and a second drive member is mounted between the rear end of the front arm and the rear arm for driving the front arm to swing back and forth relative to the rear arm.

4. An arch erecting machine with an undermining treatment function as defined in claim 3, wherein a first connecting rod and a second connecting rod are further arranged between the front arm and the rear arm, one end of the first connecting rod and one end of the second connecting rod are hinged with each other, the other end of the first connecting rod is hinged at the front end of the rear arm, the other end of the second connecting rod is hinged at the rear end of the front arm, and the hinged shaft of the first connecting rod and the second connecting rod is hinged at the movable end of the second driving member.

5. The arch raising machine with under-cut handling function according to claim 4, wherein the first link and the second link are each arc-shaped.

6. An arch raising machine having an undermining handling function as defined in claim 1, wherein a first rotary drive is provided between the base and the rear arm for driving the rear arm in a pitching motion relative to the base; a second rotary driving device is arranged between the rear arm and the front arm and is used for driving the front arm to swing back and forth relative to the rear arm;

alternatively, the crushing device is arranged to be telescopically connected back and forth in the forearm along the length direction of the forearm.

7. An arch erecting machine with an undermining treatment function as defined in claim 1, wherein the working arm comprises a rotary base and a telescopic arm hinged on the rotary base, a rotary table is mounted at the tail end of the telescopic arm, and a working platform is mounted on the rotary table;

the base of the underdigging assembly is fixedly connected to the working platform.

8. An arch raising machine with a short excavation processing function as set forth in claim 7, wherein a small arm is pivotally connected to a distal end of the telescopic arm, and the small arm can swing left and right in a horizontal direction along a vertical axis;

the rotating platform is arranged at the tail end of the small arm.

9. An arch erecting machine having an undermining treatment function as defined in claim 8, wherein a four-bar linkage structure is further provided between said small arm and said telescopic arm, said four-bar linkage structure including a front link, a rear link, four links and a third driving member;

the rear connecting piece is connected to the front end of the telescopic arm, and the front connecting piece is connected to the rear end of the small arm;

the four connecting rods are divided into two groups, and are connected on the outer sides of the front connecting piece and the rear connecting piece in a left-right mode, and the two connecting rods in the same group, the front connecting piece and the rear connecting piece form a parallelogram; and two ends of the third driving piece are respectively hinged on the front connecting piece and the rear connecting piece and are positioned on the diagonal line of the parallelogram.

10. The arch raising machine with the undermining treatment function as claimed in claim 9, wherein the end of the telescopic boom is provided with a connecting leg which is inclined and projected toward the upper front of the telescopic boom;

the rear connecting piece is provided with a convex angle which is pivoted with the connecting pin, and a fourth driving piece is arranged between the rear connecting piece and the end part of the telescopic arm.

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