CN217840130U - Double-section arm excavator working device and excavator - Google Patents

Abstract

The utility model relates to an excavator provides a two-section arm excavator work device, including back swing arm, preceding swing arm, the dipper hydro-cylinder, the scraper knife, the dipper, swing arm hydro-cylinder and lift cylinder, back swing arm articulates on last frame, the front end of preceding swing arm articulates the rear end of dipper, the rear end of preceding swing arm is equipped with the front end articulated back swing arm pin joint with the back swing arm of eccentric arrangement, the bottom edge of back swing arm pin joint place end is concave arc, the front end of dipper articulates the scraper knife, lift cylinder both ends articulate frame and back swing arm respectively, swing arm and preceding swing arm are articulated respectively at swing arm hydro-cylinder both ends, and be located back swing arm and preceding swing arm below, dipper hydro-cylinder both ends articulate preceding swing arm and dipper respectively, the articulated dipper of dipper hydro-cylinder rear end, the dipper hydro-cylinder front end is connected with the scraper knife. Additionally, the utility model also provides an excavator. The utility model discloses two sections arm excavator equipment flexibility is strong, is applicable to the operation in narrow and small space, and the operating efficiency is high.

Description

Double-section arm excavator working device and excavator

Technical Field

The utility model relates to an excavator specifically relates to a two festival arm excavator equipment. Additionally, the utility model discloses still relate to an excavator.

Background

Because the road surface construction is limited by the space of time limit for a project and place fence, the construction equipment needs to have the following characteristics: 1. the construction of a plurality of breaking-in devices cannot be accommodated, so that higher operation efficiency is required; 2. the equipment has higher flexibility and meets the space requirement of an operation field; 3. the working load is large mainly for concrete stone side working condition operation, and equipment strength needs to meet the use requirement.

At present, the method is used for breaking and transferring concrete pavements, and mainly comprises the steps of breaking the concrete pavements into small blocks by an excavator provided with a breaking hammer, and loading and transferring the concrete pavements by the excavator provided with an excavator bucket. The construction needs two excavators to cooperate with intermittent operation, the operation efficiency is low, the urban operation space influences the construction, the two sides of a concrete pavement are provided with telegraph poles, lines and the like and surrounding barriers of a construction area, the height of equipment construction and the operation turning radius are limited to a certain extent, and when the conventional excavator is used for constructing the pavement, the operation action is not flexible enough, and the operation posture needs to be adjusted frequently through advancing and retreating.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a two section arm excavator work device is provided, this two section arm excavator work device's mechanism flexibility is strong, is applicable to the operation in narrow and small space, and the operating efficiency is high.

The utility model discloses the technical problem who still remains to solve provides an excavator, and this excavator is applicable to the stone side operation in city and narrow and small space.

In order to solve the technical problem, the utility model provides a two-section arm excavator work device, including back swing arm, preceding swing arm, bucket rod hydro-cylinder, scraper, bucket rod, swing arm hydro-cylinder and lift hydro-cylinder, back swing arm rear end articulates on last frame, the front end of preceding swing arm with the rear end of bucket rod is articulated, the rear end of preceding swing arm be equipped with eccentric arrangement with the articulated back swing arm pin joint of front end of back swing arm, the bottom edge that back swing arm pin joint place was held is concave arc, the front end of bucket rod is articulated the scraper, lift hydro-cylinder both ends respectively with go up the frame with back swing arm is articulated, the hydro-cylinder both ends respectively with back swing arm with preceding swing arm is articulated, and is located back swing arm with preceding swing arm below, bucket rod hydro-cylinder both ends respectively with preceding swing arm with the bucket rod is articulated, scraper cylinder rear end is articulated on the bucket rod, scraper cylinder front end with the scraper is connected.

The shovel blade mechanism comprises a bucket rod, a connecting rod, a rocker, a shovel blade oil cylinder and a shovel blade oil cylinder, wherein one end of the rocker is hinged to the bucket rod, the other end of the rocker is hinged to one end of the connecting rod, the other end of the connecting rod is hinged to the shovel blade, the rocker, the connecting rod, the shovel blade and the bucket rod form a four-bar mechanism together, and the front end of the shovel blade oil cylinder is hinged to a hinged point of the rocker and the connecting rod.

Specifically, the spiller is U type spiller, including installation department and spiller portion, the one end of installation department with the one end of spiller portion is connected and is formed "U" type structure, the installation department with the dipper front end is articulated.

Preferably, the scraper part comprises a rack and a bottom plate, the rack is arranged on the bottom plate at intervals, and the length of the rack is gradually reduced from the middle to two sides.

Preferably, the mounting portion is of a box-type structure.

Preferably, the rear movable arm is provided with an upper frame hinge point hinged to the upper frame, a first movable arm cylinder hinge point hinged to the movable arm cylinder, a lifting cylinder hinge point hinged to the lifting cylinder, and a first front movable arm hinge point hinged to the front movable arm, and the first movable arm cylinder hinge point, the lifting cylinder hinge point, and the first front movable arm hinge point are sequentially arranged at the front end of the rear movable arm from bottom to top.

Specifically, the front movable arm is provided with a rear movable arm hinge point hinged to the rear movable arm, a first bucket rod oil cylinder hinge point hinged to the bucket rod oil cylinder, a first bucket rod hinge point hinged to the bucket rod and a second movable arm oil cylinder hinge point hinged to the movable arm oil cylinder, the first bucket rod oil cylinder hinge point is arranged on the upper side of the front movable arm, and the second movable arm oil cylinder hinge point is arranged on the lower side of the front movable arm.

Preferably, the rear boom hinge point is arranged at a position, close to the upper side, of the rear end of the front boom, and a portion, close to the rear end, of the front boom is a variable cross-section structure with a reduced cross-sectional area from front to back.

Preferably, the variable cross-section structure comprises a transition arc surface, the lower side edge of the hinge point of the rear movable arm is in transition connection with the rear end of the front movable arm through the transition arc surface, and the transition arc surface is concave towards the body direction of the front movable arm.

Further, the utility model also provides an excavator, including any one of above-mentioned technical scheme two section arm excavator equipment.

By the proposal, the utility model has the advantages that:

the utility model discloses two sections arm excavator equipment constitutes two sections arm structure through preceding swing arm and back swing arm, can effectively reduce complete machine operation height under the condition that does not reduce the operation radius, and makes equipment whole have more regulation degrees of freedom through the combined action of preceding swing arm and back swing arm, and the mechanism flexibility is higher, satisfies the urban operation requirement, improves equipment availability factor.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of an embodiment of a working device of a double-arm excavator according to the present invention;

FIG. 2 is a schematic diagram of one embodiment of a U-shaped blade;

FIG. 3 is a schematic structural view of one embodiment of the scraper blade portion;

FIG. 4 is a schematic diagram of a particular embodiment of a rear boom;

FIG. 5 is a schematic diagram of a particular embodiment of a front boom;

FIG. 6 is a schematic diagram of an embodiment of a stick.

Description of the reference numerals

1 rear boom 101 upper frame hinge point

102 first movable arm oil cylinder hinge point 103 lifting oil cylinder hinge point

104 first front movable arm hinge point 2 front movable arm

201 back swing arm hinge point 202 first dipper hydro-cylinder hinge point

203 first bucket rod hinge point 204 second movable arm cylinder hinge point

205 transition arc surface 3 bucket rod oil cylinder

4 scraper knife oil cylinder 5 connecting rod

6 shovel blade 601 installation part

602 shovel blade portion 603 rack

604 bottom plate 605 second arm hinge point

606 connecting rod hinge point 7 rocker

8 bucket rod 801 second bucket rod oil cylinder hinge point

802 scraper knife oil cylinder hinge point 803 rocker hinge point

804 blade hinge point 805 second front boom hinge point

9 swing arm cylinder 10 lifting cylinder

11 upper frame 12 chassis

13 concrete pavement 14 soil

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are only for the purpose of illustration and explanation, and the scope of the present invention is not limited to the following embodiments.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "forming", "providing", "setting", "connecting", "installing", and the like are to be interpreted broadly, for example, the connection may be a direct connection, an indirect connection through an intermediate medium, a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening connectors, either internally or in cooperative relationship to each other. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present invention, unless otherwise specified, the terms "front", "rear", "upper", "lower", and the like, which are used to indicate the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; for the orientation terms of the present invention, it should be understood in conjunction with the actual installation state. In the following description, the "front end" is an end close to the working end, and the "rear end" is an end far from the working end.

The utility model provides a two-section arm excavator equipment, including back swing arm 1, preceding swing arm 2, bucket rod hydro-cylinder 3, scraper hydro-cylinder 4, scraper 6, the dipper 8, swing arm hydro-cylinder 9 and lift cylinder 10, back swing arm 1 rear end articulates on last frame 11, the front end of preceding swing arm 2 is articulated with the rear end of bucket rod 8, the rear end of preceding swing arm 2 is equipped with eccentric arrangement with the articulated back swing arm pin joint 201 of the front end of back swing arm 1, the bottom edge of back swing arm pin joint 201 place end is the indent arc, the articulated scraper 6 of the front end of bucket rod 8, lift cylinder 10 both ends are articulated with last frame 11 and back swing arm 1 respectively, swing arm hydro-cylinder 9 both ends are articulated with back swing arm 1 and preceding swing arm 2 respectively, and be located back swing arm 1 and preceding swing arm 2 below, 3 both ends of bucket rod hydro-cylinder are articulated with preceding swing arm 2 and bucket rod 8 respectively, scraper hydro-cylinder 4 rear end is articulated on bucket rod 8, scraper hydro-cylinder 4 front end is connected with scraper 6.

The rear movable arm 1 and the front movable arm 2 jointly form a double-joint arm structure, the front movable arm 2 can rotate around a hinge point 201 of the rear movable arm relative to the rear movable arm 1 through the expansion and contraction of a movable arm oil cylinder 9, the included angle between the rear movable arm 1 and the front movable arm 2 is effectively controlled, the effective adjustment of the working radius of the working device can be realized, the working height of the rear movable arm 1 and the front movable arm 2 after recovery is reduced, the rotation radius of the whole machine is reduced, the movable arm oil cylinder 9 is arranged below the rear movable arm 1 and the front movable arm 2, the structure is more compact, the angle range for driving the front movable arm 2 to rotate is larger, in addition, the edge of the bottom of the hinge point 201 of the rear movable arm eccentrically arranged at the rear end of the front movable arm 2 is in an inwards concave arc shape, the occupied space is smaller, the interference range of the rear end of the front movable arm 2 and the rear movable arm 1 in the rotation process is reduced, the angle range for further increasing the inward rotation (namely the rotation towards the excavator body direction) of the front movable arm 2, and the place close to the excavator can be excavated; the combined action of the front movable arm 2 and the rear movable arm 1 greatly improves the overall adjustment freedom of the working device, and the mechanism has higher flexibility. Therefore, the utility model discloses two sections arm excavator equipment can be applicable to the stone side operation in city and narrow and small space more. It should be noted that, according to actual construction needs at the site, the cutting blade 6 may be replaced with a bucket or a breaking hammer to perform the construction work better.

As a specific implementation manner of the utility model discloses two sections arm excavator equipment, see fig. 1, the utility model discloses two sections arm excavator equipment still includes connecting rod 5 and rocker 7, and 7 one ends of rocker are articulated with dipper 8, and the 7 other ends of rocker are articulated with 5 one end of connecting rod, and the 5 other ends of connecting rod are articulated with spiller 6, and rocker 7, connecting rod 5, spiller 6 and dipper 8 form four-bar linkage jointly, and 4 front ends of spiller hydro-cylinder are articulated on the pin joint of rocker 7 and connecting rod 5. Flexible drive rocker 7 through spiller hydro-cylinder 4 can rotate around its pin joint with dipper 8, and rethread four-bar linkage drives spiller 6 and rotates around its pin joint with dipper 8, improves the rotational flexibility degree of spiller 6, can adjust suitable angle and carry out the operation action.

As a specific implementation manner of the utility model discloses two sections arm excavator equipment, see fig. 2, spiller 6 is U type spiller, including installation department 601 and spiller portion 602, the one end of installation department 601 and the one end of spiller portion 602 are connected and are formed "U" type structure, and installation department 601 is articulated with 8 front ends of dipper, and when excavating, the similar staff of U type spiller holds the shape of holding between the fingers the object, is favorable to prizing, cutting off and the loading and unloading operation of concrete road surface, has improved work efficiency greatly. Preferably, the length of the blade portion 602 is greater than the length of the mounting portion 601, and the opening of the U-shaped blade faces the excavator body, so that the blade portion 602 is more advantageous to cut and excavate concrete during the operation of the U-shaped blade.

Specifically, referring to fig. 1 to 3, the scraper portion 602 includes a rack 603 and a bottom plate 604, the rack 603 is disposed on the bottom plate 604 at an interval, the rack 603 can be cut into a large block by using a tooth tip at the front end of the rack 603, or the scraper portion 602 is inserted into a layer where concrete and soil 14 are connected, the concrete slab 13 is pried up to be broken, and then the large block material is shoveled into the scraper 6 and then is loaded and transported, so that the scraper is flexible and efficient, and the length of the rack 603 is gradually decreased from the middle to both sides, when a stone-side work is performed on the concrete slab 13 or soil 14, since the length of the rack 603 located in the middle is longest, the tooth tip thereof is firstly contacted with the concrete slab 13 or soil 14, the contact area is small, the pressure on the concrete slab 13 or soil 14 can be increased, the cutting force and the excavating force are improved, and after the rack 603 in the middle is cut into the concrete slab 13 or soil 14, the overall structure of the concrete slab 13 or soil 14 is damaged, which facilitates the subsequent cutting and the shorter rack 603 on both sides is subsequently cut. Preferably, the rack 603 is welded to the bottom plate 604, and the rack 603 and the tail end of the bottom plate 604 are welded to the mounting portion 601, so that the blade 6 has sufficient mechanical strength, and a tip sheath may be provided at the front end of the rack 603, and the tip sheath is made of high-strength wear-resistant steel, detachably fitted at the front end of the rack 603, to enhance the cutting strength of the front end of the rack 603, and to protect the front end of the rack 603.

Since the mounting portion 601 is a connecting portion between the blade 6 and the arm 8, and is subjected to a large force when the blade 6 performs a stone cutting work on the concrete pavement 13, the mounting portion 601 is preferably formed in a box-shaped structure having excellent bending and torsion resistance and ensuring structural stability when the blade 6 performs the work. Wherein, still be equipped with on the installation portion 601 with the connecting rod 5 articulated connecting rod pin joint 606 and with the articulated second arm pin joint 605 of arm 8.

Referring to fig. 1 and 4, as a specific embodiment of the rear boom 1 of the working device of the dual-swing arm excavator of the present invention, the rear boom 1 is provided with an upper frame pin joint 101 hinged to the upper frame 11, a first boom cylinder pin joint 102 hinged to the boom cylinder 9, a lift cylinder pin joint 103 hinged to the lift cylinder 10, and a first front boom pin joint 104 hinged to the front boom 2, the front end of the rear boom 1 is sequentially arranged from bottom to top at the first boom cylinder pin joint 102, the lift cylinder pin joint 103, and the first front boom pin joint 104, the whole structure is compact, and the hydraulic pipeline arrangement is smooth. The hinge point 103 of the lifting cylinder is arranged at the middle position of the front end of the rear movable arm 1, so that the lifting and falling strokes of the rear movable arm 1 are greatly guaranteed, the hinge point 102 of the first movable arm cylinder is arranged at the lower position of the front end of the rear movable arm 1, so that the movable arm cylinder 9 is conveniently installed on the lower side surfaces of the rear movable arm 1 and the front movable arm 2, and the hinge point 104 of the first front movable arm is arranged at the upper position of the front end of the rear movable arm 1, so that the front movable arm 2 is conveniently installed.

Referring to fig. 1 and 5, as a specific embodiment of the front boom 2 of the working device of the dual-arm excavator of the present invention, the front boom 2 is provided with a rear boom pin joint 201 hinged to the rear boom 1, a first boom cylinder pin joint 202 hinged to the boom cylinder 3, a first boom pin joint 203 hinged to the boom 8, and a second boom cylinder pin joint 204 hinged to the boom cylinder 9, the first boom cylinder pin joint 202 is disposed at an upper side of the front boom 2, and the second boom cylinder pin joint 204 is disposed at a lower side of the front boom 2.

It should be noted that, in order to enable the rotatable range of the front movable arm 2 relative to the rear movable arm 1 to meet the operation requirement and improve the working stroke of the front movable arm 2, the rear movable arm hinge point 201 is arranged at a position at which the rear end of the front movable arm 2 is close to the upper side, so that the rear movable arm hinge point 201 is eccentrically arranged, and the position at which the front movable arm 2 is close to the rear end is a variable cross-section structure with a reduced cross-sectional area from front to back, on the premise of meeting the structural strength of the joint of the front movable arm 2 and the rear movable arm 1, the space occupied by the rear end part at which the rear movable arm hinge point 201 is arranged on the front movable arm 2 is reduced, and the interference range of the rear end of the front movable arm 2 and the front end of the rear movable arm 1 in the rotation process is reduced.

Further, referring to fig. 5, the variable cross-section structure includes a transition arc surface 205, a lower side edge of the rear boom hinge point 201 is in transition connection with the rear end of the front boom 2 through the transition arc surface 205, the transition arc surface 205 is recessed towards the body of the front boom 2, an avoidance space at the rear end of the front boom 2 is larger, and the working stroke of the front boom 2 can be further improved.

Referring to fig. 1 and 6, as an embodiment of the boom 8 of the working apparatus of the dual-arm excavator of the present invention, the boom 8 is provided with a second boom cylinder hinge point 801 hinged to the boom cylinder 3, a blade cylinder hinge point 802 hinged to the blade cylinder 4, a rocker hinge point 803 hinged to the rocker 7, a blade hinge point 804 hinged to the blade 6, and a second front hinge point boom 805 hinged to the front boom 2, and the second front boom hinge point 805 is located downward and forward relative to the second boom cylinder hinge point 801, so that when the boom 8 is hinged to the front end of the front boom 2 through the second front boom hinge point 805, the second boom cylinder hinge point 801 can be exposed above the second front boom hinge point 805, so as to facilitate installation of the boom cylinder 3 located above the front boom 2, and enable the boom 8 to have a larger working stroke under the telescopic driving of the boom cylinder 3, and the mechanism flexibility is higher, thereby improving the working efficiency; the scraper knife hydro-cylinder pin joint 802 is arranged above the dipper 8 to install the scraper knife hydro-cylinder 4 above the dipper 8, be convenient for drive scraper knife 6 and rotate. In order to improve the mechanical strength of arm 8, it is preferable that arm 8 be formed by welding together high-strength steel plates, and reinforcing plates be welded to both sides of arm 8 to enhance the force-receiving capability.

The utility model discloses two festival arm excavator equipment passes through the two festival arm structures of back swing arm 1 and preceding swing arm 2 articulated formation each other, through the contained angle between flexible control swing arm 1 of swing arm hydro-cylinder 9 and the preceding swing arm 2 to can realize the radial effective regulation of equipment operation, reduce the height after two festival arm structures retrieve, reduce complete machine radius of gyration, organism gyration operation receives the space influence less, improves the trafficability characteristic. The first movable arm cylinder hinge point 102 is arranged on the lower side of the rear movable arm 1, the second movable arm cylinder hinge point 204 is arranged on the lower side of the front movable arm 2, so that the movable arm cylinder 9 is installed below the rear movable arm 1 and the front movable arm 2, the movable arm hinge point 201 at the rear end of the front movable arm 2 adopts eccentric arrangement close to the upper side and variable cross-section structural design, the front movable arm 2 can rotate towards the direction close to the excavator body more, and the place close to the excavator body is easier to dig; the hinge point 102 of the first movable arm oil cylinder of the rear movable arm 1, the hinge point 103 of the lifting oil cylinder and the hinge point 104 of the first front movable arm are sequentially arranged at the rear end of the rear movable arm from bottom to top, and the hinge points of the rear movable arm 1 and the front movable arm 2 are designed compactly, so that the integral structure of the working device is compact, and the working size of the working device can be effectively reduced. Additionally, the utility model discloses two sections arm excavator equipment's spiller 6 is U type spiller, and its installation department 601 and spiller portion 602 are connected and are formed similar staff and hold between the fingers the shape of object, are convenient for to the rise and transport of bold sheet material, and the rack 603 interval arrangement of spiller portion 602 is on bottom plate 604, and the length of rack 603 steadilys decrease to both sides in proper order from the centre, has promoted the thrust and the digging force of spiller 6 by a wide margin, is favorable to prizing, cutting off and the loading and unloading operation of concrete road surface. Therefore, make the utility model discloses two sections arm excavator equipment is applicable to the stone side operation in city and narrow and small space.

Further, the utility model also provides an excavator, include the utility model provides a two-section arm excavator equipment, equipment and last frame 11 are connected, and go up frame 11 and install on chassis 12, and this excavator has the utility model discloses two-section arm excavator equipment's all beneficial effects, no longer too much explanation here.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims (10)

1. A double-section arm excavator working device is characterized by comprising a rear movable arm (1), a front movable arm (2), an arm cylinder (3), a scraper cylinder (4), a scraper (6), an arm (8), a movable arm cylinder (9) and a lifting cylinder (10), the rear end of the rear movable arm (1) is hinged on the upper frame (11), the front end of the front movable arm (2) is hinged with the rear end of the bucket rod (8), the rear end of the front movable arm (2) is provided with a rear movable arm hinge point (201) which is eccentrically arranged and is hinged with the front end of the rear movable arm (1), the bottom edge of the end of the rear movable arm hinge point (201) is in an inward concave arc shape, the front end of the bucket rod (8) is hinged with the scraper knife (6), two ends of the lifting oil cylinder (10) are respectively hinged with the upper frame (11) and the rear movable arm (1), two ends of the movable arm oil cylinder (9) are respectively hinged with the rear movable arm (1) and the front movable arm (2), and is positioned below the rear movable arm (1) and the front movable arm (2), two ends of the bucket rod oil cylinder (3) are respectively hinged with the front movable arm (2) and the bucket rod (8), the rear end of the scraper knife oil cylinder (4) is hinged on the bucket rod (8), the front end of the scraper knife oil cylinder (4) is connected with the scraper knife (6).

2. The working device of the double-section arm excavator according to claim 1, further comprising a connecting rod (5) and a rocker (7), wherein one end of the rocker (7) is hinged to the bucket rod (8), the other end of the rocker (7) is hinged to one end of the connecting rod (5), the other end of the connecting rod (5) is hinged to the scraper knife (6), the rocker (7), the connecting rod (5), the scraper knife (6) and the bucket rod (8) jointly form a four-bar linkage mechanism, and the front end of the scraper knife cylinder (4) is hinged to the hinged point of the rocker (7) and the connecting rod (5).

3. The double-arm excavator working device according to claim 1, wherein the blade (6) is a U-shaped blade and comprises a mounting portion (601) and a blade portion (602), one end of the mounting portion (601) and one end of the blade portion (602) are connected to form a U-shaped structure, and the mounting portion (601) is hinged to the front end of the arm (8).

4. The double arm excavator working apparatus according to claim 3, wherein the blade part (602) comprises a rack (603) and a base plate (604), the rack (603) is arranged on the base plate (604) at intervals, and the length of the rack (603) is decreased from the middle to both sides.

5. The double-arm excavator work apparatus according to claim 4, wherein the mounting portion (601) is of a box-type structure.

6. The working device of a double-arm excavator according to claim 1, wherein the rear boom (1) is provided with an upper frame hinge point (101) hinged to the upper frame (11), a first boom cylinder hinge point (102) hinged to the boom cylinder (9), a lift cylinder hinge point (103) hinged to the lift cylinder (10), and a first front boom hinge point (104) hinged to the front boom (2), and the first boom cylinder hinge point (102), the lift cylinder hinge point (103), and the first front boom hinge point (104) are sequentially arranged from bottom to top at the front end of the rear boom (1).

7. The double-arm excavator working device according to claim 1, wherein the front boom (2) is provided with a rear boom hinge point (201) hinged to the rear boom (1), a first arm cylinder hinge point (202) hinged to the arm cylinder (3), a first arm cylinder hinge point (203) hinged to the arm (8), and a second boom cylinder hinge point (204) hinged to the boom cylinder (9), the first arm cylinder hinge point (202) being disposed at an upper side of the front boom (2), the second arm cylinder hinge point (204) being disposed at a lower side of the front boom (2).

8. The double-arm excavator working device according to claim 7, wherein the rear boom hinge point (201) is arranged at a position where the rear end of the front boom (2) is close to the upper side, and a portion of the front boom (2) close to the rear end is a variable cross-sectional structure having a reduced cross-sectional area from front to rear.

9. The double-arm excavator working device according to claim 8, wherein the variable cross-section structure comprises a transition arc surface (205), a lower side edge of the rear boom hinge point (201) is in transition connection with a rear end of the front boom (2) through the transition arc surface (205), and the transition arc surface (205) is concave towards a body direction of the front boom (2).

10. An excavator, comprising the double arm excavator work apparatus of any one of claims 1 to 9.

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