CN110593329A - Excavator for rapid construction of bucket rod, movable arm and PBA (Poly Butylene glycol Acether) subway station - Google Patents

Abstract

The invention discloses a bucket rod and a movable arm of an excavator and the excavator for PBA subway station quick construction, wherein two ends of the bucket rod are respectively provided with a first hinge part, at least one end of the bucket rod comprises a first silencing component, and the first silencing component comprises a first elastic buffer part and a first silencing part connected with the first elastic buffer part; in the limit area of the movement stroke of the bucket rod, the structure hinged with the first hinge part impacts the first noise reduction piece to compress the first elastic buffer piece. The bucket rod, the movable arm and the PBA excavator for the rapid construction of the subway station have two silencing functions, wherein the first elastic buffer part abuts against the last section of an impact stroke, so that impact noise at the moment is reduced, and on the other hand, the first silencing component is used for further absorbing the impact noise and carrying out noise reduction treatment from the aspects of driving and driven.

Description

Excavator for rapid construction of bucket rod, movable arm and PBA (Poly Butylene glycol Acether) subway station

Technical Field

The invention relates to the engineering machinery technology, in particular to a bucket rod, a movable arm and an excavator for PBA subway station quick construction.

Background

At present, subway construction is common in downtown areas, such as No. 12 line of Beijing subway, and the middle part of the subway is arranged along the luxurious three round north line. In order to reduce the influence on the working and living of urban areas as much as possible, the PBA subway station construction method is the mainstream urban area subway station construction method at present, in summary, the PBA subway station construction method firstly completes a plurality of guide holes on the ground, enters the ground through the guide holes to carry out construction and excavation of beams, columns, arches and the like, so that the influence on the ground is reduced to the maximum extent, and the construction of the subway station is realized under the condition that the traffic of a ground trunk road is not influenced.

In the construction of a PBA subway station, the excavator is basically excavated in a narrow underground channel, the excavator is high in noise during working, the underground channel is narrow, and the special construction environment and huge noise cause poor construction feeling and affect the construction efficiency and the emotion of personnel. In order to solve the problem, the prior art does a lot of work on the noise reduction aspect of the excavator, the noise of the excavator mainly comprises engine noise and noise brought by excavation work, and corresponding patent technologies are improved aiming at the engine noise, no matter the engine noise is air intake, exhaust or noise brought by the engine noise, for example, in the invention patent with the publication number of CN104652506B, the noise reduction of engine tail gas is realized through a noise reduction movable arm, and for example, in the utility model patent with the publication number of CN207111272U, the noise reduction of the engine is realized through a noise reduction box. There is also a new way of making a new way, for example, the utility model with the publication number of CN202159482U, it wraps up the driver's cabin of excavator through the efficient sponge of making an uproar that falls, and no matter how big is external noise like this, the noise of driver position all is less. Still other noise reduction techniques, such as utility model with grant publication No. CN108643272A, are not repeated herein.

The existing technology has the disadvantages that a noise reduction technology for impact noise in the excavation process is basically not available, the noise reduction technology is one of main noise sources of the excavator, the technology for isolating and reducing the noise of the cab only can protect one person of an excavator driver, but a lot of other construction personnel exist in a construction site, and meanwhile, the excavator driver cannot hear outside sound after efficient sound insulation, so that potential safety hazards are brought to construction.

Disclosure of Invention

The invention aims to provide a bucket rod, a movable arm and an excavator for PBA subway station rapid construction, so as to solve the defects in the technology.

In order to achieve the above purpose, the invention provides the following technical scheme:

a bucket rod of an excavator is provided with first hinge parts at two ends, at least one end of the bucket rod comprises a first silencing assembly, and the first silencing assembly comprises a first elastic buffer part and a first silencing part connected with the first elastic buffer part;

in the limit area of the movement stroke of the bucket rod, the structure hinged with the first hinge part impacts the first noise reduction piece to compress the first elastic buffer piece.

In the arm, in the limit area of the movement stroke of the arm, the bucket hinged to the first hinge part impacts the first noise damping part to compress the first elastic buffer part.

In the bucket rod, the end part of the bucket rod is provided with the groove, the first elastic buffer part is positioned in the groove, and part of the first silencing part protrudes out of the groove.

In the above bucket rod, the first silencing assembly further includes a hard shell, the first silencing piece is located in the hard shell, the hard shell includes a non-metal surface, and the non-metal surface is used for impacting a structure hinged to the first hinge portion.

In the bucket rod, the edge of the hard shell is connected to the groove wall of the groove in a sliding mode through the guide structure.

The bucket rod is provided with an inner cavity;

the groove is internally provided with a sound absorption wedge assembly, the sound absorption wedge assembly comprises a conical body, a plurality of sound absorption holes are arrayed on the conical body, a porous sound absorption part is filled in the conical body, and the inner cavity forms a resonant cavity of the conical body.

The hopper rod is characterized in that the conical body is a metal cone, a metal net rack is arranged in the conical body, and the porous sound absorption part is supported on the metal net rack.

The excavator comprises a bucket rod, and the bucket rod of the excavator is the bucket rod.

A movable arm of an excavator is provided with second hinged parts at two ends, at least one end of the movable arm comprises a second silencing assembly, and the second silencing assembly comprises a second elastic buffer part and a second silencing piece connected with the second elastic buffer part;

in the limit area of the movement stroke of the movable arm, the structure hinged with the second hinge part impacts the second noise damper to compress the second elastic buffer.

An excavator for rapid construction of a PBA subway station comprises a movable arm, wherein the movable arm of the excavator is the movable arm.

In the above technical solution, the arm of the excavator according to the present invention has two noise reduction effects, wherein the first elastic buffer abuts against the last section of the impact stroke, so as to reduce the impact noise at this time, and the first noise reduction assembly further absorbs the impact noise, thereby performing noise reduction processing from both an active side and a passive side.

As the bucket rod has the technical effects, the excavator comprising the bucket rod also has corresponding technical effects.

The movable arm of the excavator provided by the invention has two silencing functions, wherein the first section is abutted against the last section of an impact stroke through the second elastic buffer piece, so that the impact noise at the moment is reduced, and on the other hand, the second silencing component is used for further absorbing the impact noise and carrying out noise reduction treatment from the aspects of driving and driven.

Since the boom has the technical effects, the excavator comprising the boom also has the corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic structural diagram of an up-swing travel limit of an excavator according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a sway stopping limit of an excavator according to another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a dipper provided in an embodiment of the present disclosure;

FIG. 4 is a partial cross-sectional view of a stick that is provided in accordance with an embodiment of the invention;

FIG. 5 is a top view of a first muffler assembly according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a first muffler assembly according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a wedge assembly provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a first muffler assembly according to one embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a first muffler assembly according to another embodiment of the present invention;

FIG. 10 is a schematic diagram of a boom according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view of a stick according to yet another embodiment of the invention.

Description of reference numerals:

1. a bucket rod; 1.1, a groove; 1.2, inner cavity; 1.3, side plates; 1.4, a top plate; 1.5, an extension part; 2. a first noise reduction assembly; 2.1, a first elastic buffer member; 2.2, a first silencing piece; 2.3, a hard shell; 2.31, non-metal surface; 2.4, a guide structure; 3. a first hinge portion; 4. a bucket; 5. a movable arm; 6. a bucket cylinder; 7. a bucket rod cylinder; 8. a boom cylinder; 9. a body; 10. a sound-absorbing wedge assembly; 10.1, a conical body; 10.2, a porous sound absorbing portion; 10.3, a resonant cavity; 10.4, a metal net rack; 11. a second hinge portion; 12. a link mechanism; 13. a second muffler assembly; 14. a dust exhaust hole; 14.1, a dust exhaust cylinder.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

In the embodiments provided by the present invention, the arm 1, the bucket 4, and the boom 5 of the excavator are understood according to the common general knowledge in the field of engineering machinery, that is, the bucket 4 is hinged to one end of the arm 1, the other end of the arm 1 is hinged to one end of the boom 5, the other end of the boom 5 is hinged to the body 9 of the excavator, the boom 5 is driven by the boom cylinder 8, the arm 1 is driven by the arm cylinder 7, and the bucket 4 is driven by the bucket cylinder 6, during the excavation process of the excavator, as shown in fig. 1, when the bucket 4, the arm 1, and the boom 5 move to the limit of the swing-up stroke, there is a collision motion between the bucket 4 and the arm 1, the hinge structure between the arm 1 and the boom 5, the collision motion between the bucket cylinder 6 and the bucket 4, and between the arm cylinder 7 and the arm 1, and after the excavator moves fast or uses for a long time, the collision motion brings obvious noise, such as noise caused by the hinge hole wall of the hinge portion hitting the hinge shaft. In addition, the excavation of the bucket 4 also causes noise, which is more noticeable when excavating objects of larger dimensions. The noise reduction of embodiments of the present invention is primarily to eliminate such noise.

As shown in fig. 1 to 11, in an excavator boom 1 according to an embodiment of the present invention, two ends of the boom are respectively provided with a first hinge portion 3, at least one end of the boom includes a first noise reduction assembly 2, and the first noise reduction assembly 2 includes a first elastic buffer 2.1 and a first noise reduction element 2.2 connected to the first elastic buffer 2.1; in the limit area of the movement stroke of the arm 1, the structure that the first hinge parts 3 are hinged with each other impacts the first noise reduction part 2.2 to compress the first elastic buffer part 2.1.

Specifically, one end of the arm 1 is connected with the bucket 4 through one first hinge portion 3, the other end of the arm is connected with the movable arm 5 through the other first hinge portion 3, one end of the bucket cylinder 6 is rotatably connected with one end of the arm 1, the other end of the bucket cylinder 6 is simultaneously connected with the bucket 4 and the other end of the arm 1 through the link mechanism 12, the end of a soil unloading stroke is also taken off in a swinging stroke of the arm 1 and the bucket 4, impact noise can occur at each hinged and rotating connection point, and the end of a soil digging stroke is also taken off in a swinging stroke. In this embodiment, any section of the arm 1 is provided with the first silencing assembly 2, or both ends are respectively provided with the first silencing assembly 2, and the first silencing assembly 2 includes the first elastic buffer 2.1 and the first silencing piece 2.2, and the first silencing piece 2.2 is connected to the end of the arm 1 through the first elastic buffer 2.1. The first silencing part 2.2 is various structures capable of silencing, such as a thin plate resonance sound absorption structure, a perforated plate resonance sound absorption structure, a micro-perforated plate sound absorption structure and the like, the first silencing part 2.2 is used for absorbing various noises generated at the end of the bucket rod 1, and the first elastic buffering part 2.1 is an elastic buffering structure, and is most commonly used, such as a spring, and optionally an elastic rubber pad, or a metal elastic sheet and the like. In this embodiment, the position of the first silencing component 2 is set at the very end of the movement stroke of the structure (the hinged structure of the arm 1) where the first hinge part 3 is hinged at the end of the arm 1, that is, when the hinged structure moves to the front small section of the absolute limit of the stroke, the first silencing component 2.2 is collided with by the last 5-10cm stroke, the first elastic buffering component 2.1 is compressed by the collision, the movement speed of the hinged structure of the arm 1 is reduced by the elastic pressure of the first elastic buffering component 2.1, and the noise decibel generated is reduced by the lower collision speed.

In this embodiment, the elastic supporting force of the first elastic buffer 2.1 is preferably between 0.3 and 0.6 times of the pressure of the hinge structure of the arm 1, generally, the driving force of the excavator varies from several kilonewtons to several hundred kilonewtons according to the model, and if the excavating pressure of the bucket 4 of the excavator can reach ten thousand newtons, the elastic supporting force of the spring is set to be between 3000 newtons and 6000 newtons, so that the first elastic buffer 2.1 can slow down the movement speed of the hinge structure of the arm 1, but does not influence the movement of the hinge structure to the maximum stroke, and the technical effect of speed reduction at the tail end of the stroke is achieved.

In this embodiment, the housing of the first noise damping member 2.2 is preferably made of plastic, or the surface of the first noise damping member made of metal is provided with an attracting layer, such as a soft rubber layer, so that the sound of the impact of the hinge structure of the arm 1 on the first noise damping member 2.2 is less.

In this embodiment, there are four kinds of structures in which the first hinge portion 3 is hinged, that is, the hinge structure of the bucket rod 1, one is a structure in which two ends of the bucket rod 1 are directly hinged: the bucket 4 and the movable arm 5, and the bucket cylinder 6 are also arranged on the arm 1, one end of the bucket cylinder is directly hinged to the end of the arm 1, and the other end of the bucket cylinder is hinged to the end of the arm 1 through a link mechanism 12. In this embodiment, the two limit areas of the movement stroke of the arm 1 are provided, one is the movement limit of the upper swing, and the other is the movement limit of the lower swing, and at the movement limit of the upper swing and the lower swing, the hinge structure of the arm 1 has a movement process close to the arm 1, and the movement process close to the arm 1 abuts against and compresses the first silencing component 2.

The bucket rod 1 of the excavator provided by the embodiment of the invention has two silencing functions, wherein the first elastic buffer piece 2.1 is abutted against the last section of the impact stroke, so that the impact noise at the moment is reduced, and on the other hand, the first silencing component 2 is used for further absorbing the impact noise and carrying out noise reduction treatment from the aspects of driving and driven.

In another embodiment provided by the present invention, further, in the limit region of the movement stroke of the arm 1, the bucket 4 hinged to the first hinge portion 3 hits the first noise damping member 2.2 to compress the first elastic buffer member 2.1, and the hitting of the bucket 4 is the most common noise-generating situation, so that the working environment of the excavator is significantly improved by reducing and eliminating the hitting noise of the bucket 4.

In another embodiment provided by the present invention, further, a groove 1.1 is disposed at an end of the bucket rod 1, the first elastic buffer 2.1 is located in the groove 1.1, a part of the first noise reduction element 2.2 protrudes out of the groove 1.1, the bucket rod 1 is a box-shaped structure surrounded by four side plates 1.3, and an inner cavity 1.2 is disposed inside the box-shaped structure, and a corresponding reinforcing structure and a hinge structure are disposed at a portion that needs to be reinforced and hinged, which is not described herein again. In this embodiment, set up the recess 1.1 structure of indent at the tip of dipper 1 for hold first amortization spare 2.2, make first amortization spare 2.2 only part protrusion in recess 1.1, whole major part is located recess 1.1, and first elastic buffer spare 2.1 is whole to be located recess 1.1, so hide on the one hand and arrange first amortization subassembly 2, reduce the various convex structures of excavator surface, on the other hand protects first amortization subassembly 2, the complicated operating mode that prevents the excavator work leads to the condition of first amortization subassembly 2 damage to appear.

As shown in fig. 5 to 6, further, the first noise reduction assembly 2 further includes a hard shell 2.3, the first noise reduction member 2.2 is located in the hard shell 2.3, the hard shell 2.3 includes a non-metal surface 2.31, for example, the hard shell 2.3 itself is made of a non-metal material, such as a hard plastic shell, or the hard shell 2.3 is a metal shell, a non-metal layer is disposed on the metal shell, such as a rubber layer is bonded on the metal shell, the non-metal surface 2.31 is used for impacting a structure hinged to the first hinge 3, the hard shell 2.3 is used for protecting the first noise reduction member 2.2, the hinge structure is prevented from being damaged or damaged due to direct impact, and the noise reduction effect is achieved, and at the same time, the non-metal surface 2.31, especially the rubber surface, can greatly reduce the volume of noise generated during impact.

In this embodiment, further, the edge of the hard casing 2.3 is slidably connected to the groove wall of the groove 1.1 through a guide structure 2.4, and the guide structure 2.4 may be a strip-shaped protrusion or a strip-shaped groove, so that the hard casing 2.3 moves in the groove 1.1 more orderly.

Preferably, the hard shell 2.3 is a box-shaped structure, the top and the bottom of the hard shell are both hollow, the first silencing piece 2.2 is arranged inside the box body, and the hollow structure reduces the influence on noise propagation.

Still further, as shown in fig. 11, a groove 1.1 is located in the groove 1.1 in the limit area of the movement stroke of the arm 1, the portion of the structure hinged by the first hinge portion 3 for impact is located in the groove 1.1, in the prior art, the structure hinged by the arm 1, such as the bucket 4, is mainly used for impact by each hinge shaft, each hinge shaft impacts the hole wall of the corresponding shaft hole, and these hinge shafts are located outside the groove 1.1, in this embodiment, two side plates 1.3 of the arm 1 protrude from a top plate 1.4 and/or a bottom plate to form the groove 1.1, that is, the side plate 1.3 is provided with an extension portion 1.5, the extension portion 1.5 protrudes from the top plate 1.4 or the bottom plate, and the space between the two extension portions 1.5 is collectively referred to as a groove 1.1, so that at least most of the impact on the hinge structure hinged by the arm 1 is contained between the two side plates 1.3, and thus, the effect that the impact sound groove, the first sound damping element 2.2 is also arranged in the recess 1.1, so that the sound damping effect is more advantageous.

Still further, the bottom of recess 1.1 is provided with dust exhaust hole 14, and dust exhaust hole 14 communicates the inboard of recess 1.1 and the outside of dipper 1, and dust exhaust hole 14 extends to curb plate 1.3 or bottom plate from roof 1.4 of dipper 1, and its effect lies in gathering the dust in recess 1.1 during the construction, discharges these dust through dust exhaust hole 14.

Preferably, a plurality of dust exhaust tubes 14.1 are arranged, two ends of each dust exhaust tube 14.1 are respectively welded on the top plate 1.4 and the bottom plate of the bucket rod 1, and the dust exhaust tubes 14.1 connecting the top plate 1.4 and the bottom plate have a reinforcing effect on the bucket rod 1, so that synchronous reinforcing and dust exhaust effects are realized.

Furthermore, the bottom surface of the groove 1.1 is a conical surface or an inverted conical surface, and the dust exhaust hole 14 is formed in the concave part of the conical surface or the inverted conical surface, so that the dust is driven to naturally exhaust from the inside of the groove 1.1 through the dust exhaust hole 14 by utilizing the gravity action of the bucket rod 1 in the frequent movement process.

In still another embodiment of the present invention, as shown in fig. 7-9, the sound-absorbing wedge assembly 10 is further included, wherein the top plate 1.4, the bottom plate and the two side plates 1.3 of the bucket rod 1 enclose an inner cavity 1.2; a wedge sound absorption assembly 10 is arranged in the groove 1.1, the wedge sound absorption assembly 10 comprises a conical body 10.1, a plurality of sound absorption holes are arrayed on the conical body 10.1, a porous sound absorption part 10.2 is filled in the conical body 10.1, and the inner cavity 1.2 forms a resonant cavity 10.3 of the conical body 10.1. The cone 10.1 is used for receiving sound waves, the porous sound absorption part 10.2 is made of sound absorption materials with a plurality of fine holes, the sound waves enter the porous sound absorption part 10.2 for first sound absorption and noise reduction, then pass through the top plate 1.4 to enter the inner cavity 1.2, and resonate in the inner cavity 1.2 for second resonance noise reduction. Moreover, the inner cavity 1.2 of the bucket rod 1 is used as a resonant cavity 10.3, a part is omitted for the wedge sound absorption assembly 10, and the corresponding top plate 1.4 can be adaptively modified for the wedge sound absorption assembly 10 in order to improve the noise elimination effect.

Still further, cone 10.1 is the metal cone, be provided with metal net rack 10.4 in the cone 10.1, porous sound absorption portion 10.2 support in on the metal net rack 10.4, porous sound absorption portion 10.2 is connected on metal net rack 10.4, and metal net rack 10.4 promotes the bulk strength of cone 10.1 like spiral wire.

In the above embodiment of the present invention, the first sound-absorbing member and the wedge assembly 10 are disposed at the same time, and in terms of spatial arrangement, both of them may be disposed at one side, or the wedge assembly 10 may be disposed in the middle, and one first sound-absorbing member is disposed at each of both sides.

The embodiment of the invention further provides an excavator, which comprises a bucket rod 1, wherein the bucket rod 1 of the excavator is the bucket rod 1. In the above technical solution, since the arm 1 has the above technical effects, an excavator including the arm 1 should also have corresponding technical effects.

The embodiment of the invention also provides a movable arm 5 of the excavator, wherein two ends of the movable arm are respectively provided with a second hinge part 11, at least one end of the movable arm comprises a second silencing assembly 13, and the second silencing assembly 13 comprises a second elastic buffer part and a second silencing part connected with the second elastic buffer part; in the limit area of the movement stroke of the movable arm 5, the structure in which the second hinge portion 11 is hinged strikes the second noise damping member to compress the second elastic buffering member.

Specifically, in this embodiment, except for the difference in the structure of the two hinged ends, the hinged structure of the movable arm 5 is the bucket rod 1 and the machine body 9, and the rest of the sound-deadening structures of the movable arm 5 can be directly adapted to the corresponding structure of the bucket rod 1 only by adaptively modifying the size, such as the hard shell 2.3, the groove 1.1, the extension portion 1.5, the dust exhaust hole 14, and the like, which can be directly applied to the movable arm 5. Obviously, the technical effects of these structures on boom 1 are also applicable to boom 5.

The boom 5 of the excavator provided by the embodiment of the invention has two noise reduction functions, wherein the first noise reduction function is used for reducing the impact noise at the moment by abutting against the last section of the impact stroke through the second elastic buffer piece, and the second noise reduction function 13 is used for further absorbing the impact noise so as to perform noise reduction treatment from the aspects of driving and driven.

The embodiment of the invention also provides an excavator for rapid construction of the PBA subway station, which comprises a movable arm 5, wherein the movable arm 5 of the excavator is the movable arm 5. Since the boom 5 has the technical effects, the excavator including the boom 5 should also have corresponding technical effects.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims (10)

1. The two ends of a bucket rod of an excavator are provided with first hinged parts, and the bucket rod is characterized in that at least one end of the bucket rod comprises a first silencing assembly, and the first silencing assembly comprises a first elastic buffer part and a first silencing part connected with the first elastic buffer part;

in the limit area of the movement stroke of the bucket rod, the structure hinged with the first hinge part impacts the first noise reduction piece to compress the first elastic buffer piece.

2. The stick of claim 1, wherein in a limit region of the stick's range of motion, the bucket articulated by the first articulation strikes the first noise dampening member to compress the first resilient bumper.

3. The arm of claim 1, wherein a groove is provided at an end of the arm, the resilient buffer is located in the groove, and a portion of the first noise dampening member protrudes from the groove.

4. The stick of claim 3, wherein the first sound attenuating assembly further comprises a rigid shell within which the first sound attenuating member is located, the rigid shell comprising a non-metallic face for impacting a structure articulated with the first articulation.

5. The stick of claim 4, wherein the rim of the hard shell is slidably attached to the wall of the groove by a guide structure.

6. The stick of claim 3, wherein the stick has an internal cavity;

the groove is internally provided with a sound absorption wedge assembly, the sound absorption wedge assembly comprises a conical body, a plurality of sound absorption holes are arrayed on the conical body, a porous sound absorption part is filled in the conical body, and the inner cavity forms a resonant cavity of the conical body.

7. The dipper of claim 3, wherein the cone is a metal cone, a metal mesh frame is disposed within the cone, and the porous sound absorbing portion is supported on the metal mesh frame.

8. An excavator comprising a stick, wherein the stick of the excavator is as claimed in any one of claims 1 to 7.

9. A movable arm of an excavator is provided with second hinged parts at two ends, and is characterized in that at least one end of the movable arm comprises a second silencing assembly, and the second silencing assembly comprises a second elastic buffer part and a second silencing part connected with the second elastic buffer part;

in the limit area of the movement stroke of the movable arm, the structure hinged with the second hinge part impacts the second noise damper to compress the second elastic buffer.

10. An excavator for rapid construction of a PBA subway station comprises a movable arm, and is characterized in that the movable arm of the excavator is the movable arm in claim 9.