A branch-type crank arm swing arm frame and engineering vehicle

Abstract

This invention discloses a branch-type articulated boom swing boom and engineering vehicle, relating to the field of engineering construction equipment technology, which can at least partially solve the problem of the complexity of double-arm or multi-arm structures in current articulated boom folding structures. An embodiment of this invention provides a branch-type articulated boom swing boom, comprising: a turntable and a branch-type articulated boom hinged to the turntable; the branch-type articulated boom includes: a main boom with its bottom end hinged to the turntable and at least two outriggers mounted on the main boom; the outriggers include a top outrigger mounted on the top of the main boom in a pitch-swing manner, and at least one intermediate outrigger mounted between the bottom and top ends of the main boom in a pitch-swing and / or circumferentially swing manner; it also includes a main drive mechanism for driving the main boom to swing and a branch drive mechanism for driving the outriggers to swing.

Description

Technical Field

[0001] The invention relates to the technical field of engineering construction equipment, and in particular to a branch-type crank arm swing boom and an engineering vehicle. Background Art

[0002] At present, engineering vehicles used in engineering construction usually adopt a straight arm structure. The arm structure has many disadvantages in the complex municipal engineering, construction tunnel or mining environment, especially the operation method and space are greatly restricted. It usually takes a lot of work to clear these obstacles, which seriously affects the construction efficiency.

[0003] Although the industry has introduced a folding boom structure that can improve the above problems, there are still many disadvantages because the current folding boom structure can only have one boom function. In a more complex working environment, it is usually necessary to use more than two engineering vehicles to assist in completion, which seriously affects the construction. In addition, although the industry currently has double-arm or multi-arm structures, the overall structure is complex, the operating cost is high, and the control operation is difficult. Therefore, in response to the above-mentioned series of problems, a branch-type crank arm swing boom and an engineering vehicle are specially proposed. Summary of the invention

[0004] The purpose of the present application is to provide a branch-type crank arm swing boom and an engineering vehicle to solve the problem that the double-arm or multi-arm structure in the current crank arm folding structure is relatively complicated.

[0005] In order to solve the above technical problems, the present invention adopts the following solutions:

[0006] On the one hand, the present application provides a branch-type crank arm swing arm frame, comprising:

[0007] A turntable and a branch-type curved arm hinged on the turntable;

[0008] The branch type curved arm comprises:

[0009] A main arm with a bottom end hinged to a rotating platform and at least two supporting arms mounted on the main arm;

[0010] The support arm comprises a top support arm mounted on the top end of the main arm in a manner capable of pitching and swinging, and at least one intermediate support arm mounted between the bottom end and the top end of the main arm in a manner capable of pitching and / or swinging along the circumference of the main arm;

[0011] It also includes a main trunk driving mechanism for driving the main arm to swing and a branch trunk driving mechanism for driving the branch arm to swing.

[0012] The main design concept of the present application is to provide a main arm hinged on a turntable, a top arm that can swing at the top of the main arm, and at least one intermediate arm that swings between the top and bottom ends of the main arm, so that the main arm, the top arm and the intermediate arm can form a branch-type curved arm that can be swung on the turntable. The top arm and several intermediate arms of the present application are all installed on the same main arm, so that when the main arm is swinging, all the arms swing along the hinge point of the main arm on the turntable, so that the top arm and the intermediate arms can achieve efficient collaborative work in the actual working process, effectively improving work efficiency. In particular, in some optional embodiments, the intermediate arm can also swing along the circumference of the main arm, so that When the top arm rotates with the main arm to other positions to work, the middle arm can also work near the original position, which can significantly improve work efficiency in some application scenarios. In addition, the top arm and several middle arms are installed on the same main arm, which can effectively reduce the construction complexity of the double-arm or multi-arm structure while improving the compactness of the structure to cope with the complex working environment in actual engineering application scenarios and improve its adaptability. Therefore, the branch-type curved arm hinged on the turntable in the present application not only has high work efficiency when the arms work together, but also has a compact and simple structure and occupies little space. At the same time, it can also solve the problem of the relatively complex double-arm or multi-arm structure in the current curved arm folding structure.

[0013] Preferably, the number of the intermediate arm is one, and the intermediate arm is movably connected to the main arm in a manner capable of pitching and swinging and swinging along the circumference of the main arm;

[0014] The branch driving mechanism comprises a pitch driving mechanism for driving the intermediate branch arm to pitch and swing, and a circumferential swing driving mechanism for driving the intermediate branch arm to swing along the circumferential direction of the main arm.

[0015] Preferably, the oscillating drive mechanism comprises a rotating cylinder mounted on the main arm, and the intermediate arm is mounted on the output end of the rotating cylinder;

[0016] The pitch driving mechanism comprises a telescopic oil cylinder with one end hinged on the middle support arm and the other end hinged on the output end of the rotating oil cylinder.

[0017] Preferably, the oscillating drive mechanism and the pitching drive mechanism both include telescopic cylinders;

[0018] The oscillating drive mechanism also includes a mounting seat, one end of the telescopic oil cylinder of the oscillating drive mechanism is hinged on the mounting seat, and the other end is movably connected to the main arm, and the intermediate arm is movably connected to the mounting seat. The oscillating drive mechanism drives the mounting seat to swing and then drives the intermediate arm to swing along the circumference of the main arm;

[0019] One end of the telescopic oil cylinder of the pitch driving mechanism is hinged to the bottom surface of the middle support arm away from the top support arm, and the other end is movably connected to the mounting seat.

[0020] Preferably, the angle range of the pitch swing of the intermediate support arm and the circumferential swing along the main arm is: 60° to 120°.

[0021] Preferably, the main arm is a curved arm, and the middle arm and the top arm are straight arms;

[0022] The main arm, the middle arm and the top arm form a Y-shaped curved arm.

[0023] Preferably, the trunk driving mechanism includes a telescopic cylinder, one end of which is hinged to the turntable, and the other end is hinged to the main arm. The telescopic cylinder is used to drive the main arm to swing along the hinge point between it and the turntable, and the swing angle range of the main arm is: 60° to 120°.

[0024] Preferably, the number of the intermediate arms is two, the two intermediate arms are arranged at intervals on the same side of the main arm, and the two intermediate arms are movably connected to the main arm in a manner of being able to swing in pitch and / or swing along the circumference of the main arm;

[0025] The branch driving mechanism comprises two pitch driving mechanisms for driving the intermediate branch arms to pitch and swing, and two circumferential swing driving mechanisms for driving the intermediate branch arms to swing along the circumferential direction of the main arm.

[0026] Preferably, the branch drive mechanism includes a pitch drive mechanism for driving the top branch arm to pitch and swing at the top end of the main arm;

[0027] The pitch drive mechanism comprises a telescopic cylinder.

[0028] On the other hand, the present application provides an engineering vehicle, including an engineering chassis, including any of the above-mentioned branch-type curved arm swing arm frames, and a working device, the working device is arranged at one end of the support arm away from the main arm, and the turntable of the branch-type curved arm swing arm frame is rotatably connected to the engineering chassis.

[0029] Beneficial effects of the present invention:

[0030] The support arms of the present application are all mounted on the main arm in a swinging manner, so that multiple support arms can move with the swing of the main arm and can swing independently. They are easy to control while maintaining applicability, which can greatly save construction time. Compared with traditional double-arm and multi-arm individual control, the difficulty of operating and controlling two-arm and multi-arm can be better reduced, and the problem of interference that is prone to occur in traditional multi-arm individual control can be avoided. In addition, the branch-type structure is adopted, which occupies very little space in a narrow space after folding, and can cope with more complex actual engineering scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the main structure of one exemplary embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the main structure of the top support arm of one exemplary embodiment of the present invention when in use;

[0033] Figure 3 This is a schematic diagram of the main structure of the intermediate support arm of one exemplary embodiment of the present invention when in use;

[0034] Figure 4 It is a structural schematic diagram of a case where the oscillating drive mechanism in one exemplary embodiment of the present invention is a rotating oil cylinder;

[0035] Figure 5 It is a structural schematic diagram of a case where the oscillating drive mechanism in one exemplary embodiment of the present invention is a telescopic cylinder.

[0036] Description of reference numerals:

[0037] 1-turntable, 2-main arm, 3-top support arm, 4-middle support arm, 5-trunk drive mechanism, 6-swing drive mechanism, 61-mounting seat, 7-working device, 8-engineering chassis, 9-pitch drive mechanism. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0039] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments:

[0042] Example 1

[0043] like Figures 1 to 4 As shown, this embodiment provides a branch-type crank arm swing arm frame, comprising:

[0044] A turntable 1 and a branch-type crank arm hinged on the turntable 1;

[0045] The branch type curved arm comprises:

[0046] A main arm 2 whose bottom end is hinged on the turntable 1 and at least two supporting arms mounted on the main arm 2;

[0047] The support arm includes a top support arm 3 installed on the top end of the main arm 2 in a manner capable of pitching and swinging, and at least one intermediate support arm 4 installed between the bottom end and the top end of the main arm 2 in a manner capable of pitching and / or swinging along the circumferential direction of the main arm 2;

[0048] It also includes a trunk driving mechanism 5 for driving the main arm 2 to swing and a branch driving mechanism for driving the branch arm to swing.

[0049] The main design concept of the present application is to provide a main arm 2 hinged on the turntable 1, and a top arm 3 that can swing at the top of the main arm 2 and at least one intermediate arm 4 that swings between the top and bottom ends of the main arm 2, so that the main arm 2, the top arm 3 and the intermediate arm 4 can form a branch-type curved arm that can be used to swing on the turntable 1. The top arm 3 and several intermediate arms 4 of the present application are all installed on the same main arm 2, so that when the main arm 2 is swinging, all the arms swing along the hinge point of the main arm 2 on the turntable 1, so that the top arm 3 and the intermediate arms 4 can achieve efficient collaborative work in the actual working process, effectively improving work efficiency. In particular, in some optional embodiments, the intermediate arm 4 can also swing circumferentially along the main arm 2. The top support arm 3 rotates with the main arm 2 to other positions for work, and the middle support arm 4 can also work near the original position, which can significantly improve the work efficiency in some application scenarios. In addition, the top support arm 3 and several middle support arms 4 are all installed on the same main arm 2, which can also effectively reduce the construction complexity of the double-arm or multi-arm structure and improve the compactness of the structure to cope with the complex working environment in actual engineering application scenarios and improve its adaptability. Therefore, the branch-type curved arm hinged on the turntable 1 in the present application not only has high work efficiency and is not prone to mutual interference when the arms work together, but also has a compact and simple structure and occupies a small space. At the same time, it can also solve the problem that the double-arm or multi-arm structure is more complicated in the current curved arm folding structure.

[0050] In this embodiment, Figures 1 to 3As shown, the middle arm 4 is installed between the bottom and top of the main arm 2 in a manner that it can pitch and swing along the circumference of the main arm 2 at the same time, and the top arm 3 is installed on the top of the main arm 2 in a manner that it can pitch and swing. The branch driving mechanism can drive the top arm 3 to pitch and swing, and drive the middle arm 4 to pitch and swing along the circumference of the main arm 2 at the same time. When the main arm 2 is in a stopped state, the end of the top arm 3 away from the main arm 2 swings in an arc shape, and the end of the middle arm 4 away from the main arm 2 swings in a spherical curved surface shape.

[0051] During the operation, when it is necessary to change the working area, the turntable 1 is driven to rotate, thereby driving the entire branch-type curved arm to rotate. At this time, the two working devices 7 at both ends of the arm are replaced to the new working area for operation; when the operation in the high-altitude working area is completed and the low-altitude working area is not yet completed, the turntable 1 is driven to rotate, and the oscillating drive mechanism 6 is driven at the same time, so that the top arm 3 rotates with the main arm 2, while the working device 7 at the middle arm 4 remains in the current area to continue working; when the operation in the high-altitude working area is not completed and the low-altitude working area is completed, only the oscillating drive mechanism 6 is driven to transfer the working device 7 at the middle arm 4 to the new working area for operation.

[0052] In an optional embodiment, the support arm can be installed on the main arm 2 through another support arm, and several support arms and the main arm 2 can form a tree-like branch-type curved arm.

[0053] Specifically, the number of the intermediate arm 4 is one, and the intermediate arm 4 is movably connected to the main arm 2 in a manner that it can swing in pitch and in a circumferential direction of the main arm 2;

[0054] The branch driving mechanism includes a pitch driving mechanism 9 for driving the intermediate arm 4 to pitch and swing, and a circumferential swing driving mechanism 6 for driving the intermediate arm 4 to swing circumferentially along the main arm 2. The intermediate arm 4 is connected to the main arm 2 through the circumferential swing driving mechanism 6. The circumferential swing driving mechanism 6 can drive the intermediate arm 4 to swing circumferentially along the main arm 2, and the pitch driving mechanism 9 can drive the intermediate arm 4 to pitch and swing. In actual use, the top arm 3 works at a high altitude, and the intermediate arm 4 can work at a low altitude below the top arm 3.

[0055] In some optional embodiments, the intermediate arm 4 is installed on the main arm 2 in a manner that it can only swing in pitch. In some optional embodiments, the intermediate arm 4 is installed on the main arm 2 in a manner that it can only swing in the circumferential direction of the main arm 2.

[0056] In a preferred exemplary embodiment, Figure 4As shown, the oscillating drive mechanism 6 includes a rotating cylinder mounted on the main arm 2, and the intermediate arm 4 is mounted on the output end of the rotating cylinder; in some embodiments, a mounting block can be fixed on the output end of the rotating cylinder, and the end of the intermediate arm 4 away from the working device 7 can be hinged on the mounting block;

[0057] The pitch drive mechanism 9 includes a telescopic cylinder with one end hinged to the middle support arm 4 and the other end hinged to the output end of the rotary cylinder. Figure 4 As shown, the cross section of the main arm 2 is U-shaped, the rotating cylinder is installed in the U-shaped main arm 2, and the intermediate arm 4 is installed on the output end of the rotating cylinder. The U-shaped main arm 2 can limit the angle of rotation and swing of the intermediate arm 4 along the circumferential direction of the main arm 2. In some embodiments, the rotation and swing angle of the intermediate arm 4 can be limited by the angle amplitude of the rotation of the rotating cylinder itself. In this embodiment, the rotating cylinder and the telescopic cylinder are both common devices in the field and are not described in detail here. In some embodiments, the rotating cylinder and the telescopic cylinder can also use cylinders.

[0058] Preferably, the pitching and swinging angles of the intermediate arm 4 and the circumferential swinging angles of the main arm 2 are in the range of 60° to 120°. In this embodiment, the pitching and swinging angles of the intermediate arm 4 and the circumferential swinging angles of the main arm 2 are both about 90°. In some embodiments, the pitching and swinging angles of the intermediate arm 4 and the circumferential swinging angles of the main arm 2 can also be 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°.

[0059] In a preferred exemplary embodiment, the main arm 2 is a curved arm, and the intermediate arm 4 and the top arm 3 are both straight arms;

[0060] The main arm 2, the middle arm 4 and the top arm 3 form a Y-shaped curved arm. In this embodiment, the main arm 2 and the portion from the bottom end of the main arm 2 to the middle arm 4 serve as the trunk of the Y-shaped curved arm, the top arm 3 and the portion from the top end of the main arm 2 to the middle arm 4 serve as the first branch of the Y-shaped curved arm, and the middle arm 4 serves as the second branch of the Y-shaped curved arm.

[0061] In a preferred example implementation, the trunk drive mechanism 5 includes a telescopic cylinder, one end of which is hinged to the turntable 1, and the other end is hinged to the main arm 2. The telescopic cylinder is used to drive the main arm 2 to swing along the hinge point between it and the turntable 1, and the swing angle range of the main arm 2 is: 60° to 120°. In this embodiment, the swing angle of the main arm 2 can be 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°. In this embodiment, Figure 1 and Figure 2As shown, when the telescopic cylinder of the trunk driving mechanism 5 is in an extended state, the end of the main arm 2 away from the turntable 1 is close to the engineering chassis 8, and at this time, the main arm 2 is in a folded state. Conversely, when the telescopic cylinder of the trunk driving mechanism 5 is in a contracted state, the main arm 2 is in an open state; when the telescopic cylinder of the pitch driving mechanism 9 is in a contracted state, the end of the branch arm away from the main arm 2 is close to the main arm 2, and the branch arm is in a contracted state. Conversely, when the telescopic cylinder of the pitch driving mechanism 9 is in an extended state, the branch arm is in an open state.

[0062] In a preferred exemplary embodiment, the number of the intermediate arms 4 is two, the two intermediate arms 4 are arranged at intervals on the same side of the main arm 2, and the two intermediate arms 4 are movably connected to the main arm 2 in a manner that they can swing in pitch and / or swing in the circumferential direction of the main arm 2;

[0063] The branch driving mechanism includes two pitch driving mechanisms 9 for driving the intermediate arms 4 to pitch and swing, and two oscillation driving mechanisms 6 for driving the intermediate arms 4 to swing along the circumference of the main arm 2. Two intermediate arms 4 are provided, so that the top arm 3 and the intermediate arm 4 of the branch-type crank arm can respectively move the working device 7 to three heights, high, medium and low, for operation, thereby improving work efficiency.

[0064] In a preferred exemplary embodiment, the branch driving mechanism includes a pitch driving mechanism 9 for driving the top support arm 3 to pitch and swing at the top end of the main arm 2;

[0065] The pitch drive mechanism 9 includes a telescopic cylinder.

[0066] Embodiment 2:

[0067] In a preferred exemplary embodiment, Figure 5 As shown, the oscillating drive mechanism 6 and the pitching drive mechanism 9 both include telescopic cylinders;

[0068] The oscillating drive mechanism 6 also includes a mounting seat 61. One end of the telescopic cylinder of the oscillating drive mechanism 6 is hinged on the mounting seat 61, and the other end is movably connected to the main arm 2. The intermediate arm 4 is movably connected to the mounting seat 61. The oscillating drive mechanism 6 drives the mounting seat 61 to swing, thereby driving the intermediate arm 4 to swing along the circumferential direction of the main arm 2.

[0069] One end of the telescopic oil cylinder of the pitch driving mechanism 9 is hinged to the bottom surface of the middle arm 4 away from the top arm 3, and the other end is movably connected to the mounting seat 61. Figure 5 As shown, the transverse section of the main arm 2 is U-shaped, and the output end of the telescopic cylinder of the oscillating drive mechanism 6 is hinged to one end of the U-shaped main arm 2, and the other end is hinged to the end of the mounting seat 61 away from the middle support arm 4.

[0070] When in use, the telescopic cylinder of the oscillating drive mechanism 6 is started, and the telescopic cylinder can push the mounting seat 61 to swing along its circumferential direction on the main arm 2, thereby driving the intermediate arm 4 installed on the mounting seat 61 and the telescopic cylinder of the pitch driving mechanism 9 to swing circumferentially together. By starting the telescopic cylinder of the pitch driving mechanism 9, the intermediate arm 4 can be driven to pitch and swing on the mounting seat 61. Through the coordinated cooperation of the oscillating drive mechanism 6 and the pitch driving mechanism 9, the intermediate arm 4 can be driven to pitch and swing circumferentially on the main arm, so that the swing of the intermediate arm 4 away from one end of the main arm 2 presents a spherical curved surface, which can effectively improve the working efficiency of the working device 7 installed on the intermediate arm 4.

[0071] The rest of the structure of this embodiment is the same as that of the above-mentioned embodiment 1 and will not be described again here.

[0072] Embodiment 3:

[0073] Based on the above-mentioned embodiment 1, this embodiment provides an engineering vehicle, including an engineering chassis 8, including any of the above-mentioned branch-type curved arm swing arm frames, and a working device 7, the working device 7 is arranged at one end of the support arm away from the main arm 2, and the turntable 1 of the branch-type curved arm swing arm frame is rotatably connected to the engineering chassis 8.

[0074] When in use, after the engineering vehicle moves to the area to be worked on, the telescopic cylinder of the main driving mechanism 5 is driven to retract, so that the main arm 2 is opened and moved toward the vertical direction, and then the pitch driving mechanism 9 and the swing driving mechanism 6 are started to open the support arm, and the working device 7 at the end of the support arm can start working.

[0075] In this embodiment, the working device 7 is an existing conventional device and is not listed here.

[0076] The remaining structures in this embodiment are the same as those in the above-mentioned embodiment 1 and will not be described again here.

[0077] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A branch-type crank arm swing arm frame, characterized in that: include: A turntable (1) and a branch-type curved arm hinged on the turntable (1); The branch type curved arm comprises: A main arm (2) whose bottom end is hinged to the turntable (1) and at least two supporting arms mounted on the main arm (2); The support arm comprises a top support arm (3) mounted on the top end of the main arm (2) in a manner capable of pitching and swinging, and at least one intermediate support arm (4) mounted between the bottom end and the top end of the main arm (2) in a manner capable of pitching and / or swinging along the circumference of the main arm (2); It also includes a trunk driving mechanism (5) for driving the main arm (2) to swing and a branch driving mechanism for driving the branch arm to swing; The intermediate support arm (4) is movably connected to the main arm (2) in a manner capable of pitching and swinging and swinging in the circumferential direction of the main arm (2); The branch drive mechanism comprises a pitch drive mechanism (9) for driving the intermediate branch arm (4) to pitch and swing, and a circumferential swing drive mechanism (6) for driving the intermediate branch arm (4) to swing along the circumferential direction of the main arm (2); The oscillating drive mechanism (6) comprises a rotating cylinder mounted on the main arm (2), and the intermediate support arm (4) is mounted on the output end of the rotating cylinder; The pitch drive mechanism (9) comprises a telescopic cylinder having one end hinged to the middle support arm (4) and the other end hinged to the output end of the rotating cylinder; The oscillating drive mechanism (6) and the pitching drive mechanism (9) both comprise telescopic cylinders; The oscillating drive mechanism (6) further comprises a mounting seat (61), one end of a telescopic oil cylinder of the oscillating drive mechanism (6) is hinged on the mounting seat (61), and the other end is movably connected to the main arm (2), and the intermediate support arm (4) is movably connected to the mounting seat (61). The oscillating drive mechanism (6) drives the mounting seat (61) to swing, thereby driving the intermediate support arm (4) to swing along the circumferential direction of the main arm (2); One end of the telescopic oil cylinder of the pitch drive mechanism (9) is hinged to the bottom surface of the middle support arm (4) away from the top support arm (3), and the other end is movably connected to the mounting seat (61).

2. A branch type crank arm swing arm according to claim 1, characterized in that: The number of the intermediate support arm (4) is 1.

3. A branch type crank arm swing arm according to claim 1, characterized in that: The angle range of the pitching swing of the intermediate support arm (4) and the circumferential swing along the main arm (2) is: 60° to 120°.

4. A branch type crank arm swing arm according to claim 1, characterized in that: The main arm (2) is a curved arm, and the intermediate arm (4) and the top arm (3) are both straight arms; The main arm (2), the middle arm (4) and the top arm (3) form a Y-shaped curved arm.

5. A branch type crank arm swing arm frame according to claim 1, characterized in that: The trunk driving mechanism (5) comprises a telescopic cylinder, one end of which is hinged to the turntable (1), and the other end of which is hinged to the main arm (2). The telescopic cylinder is used to drive the main arm (2) to swing along the hinge point between the main arm (2) and the turntable (1). The swing angle range of the main arm (2) is 60° to 120°.

6. A branch type crank arm swing arm according to claim 1, characterized in that: The number of the intermediate arms (4) is two, the two intermediate arms (4) are arranged at intervals on the same side of the main arm (2), and the two intermediate arms (4) are movably connected to the main arm (2) in a manner capable of pitching and swinging and / or swinging along the circumference of the main arm (2); The branch drive mechanism comprises two pitch drive mechanisms (9) for driving the intermediate branch arms (4) to pitch and swing, and two oscillation drive mechanisms (6) for driving the intermediate branch arms (4) to swing along the circumference of the main arm (2).

7. A branch type crank arm swing arm according to claim 1, characterized in that: The branch drive mechanism comprises a pitch drive mechanism (9) for driving the top branch arm (3) to pitch and swing at the top end of the main arm (2); The pitch drive mechanism (9) comprises a telescopic oil cylinder.

8. An engineering vehicle, comprising an engineering chassis (8), characterized in that: It comprises a branch-type crank arm swing arm frame as described in any one of claims 1 to 7, and a working device (7), wherein the working device (7) is arranged at one end of the support arm away from the main arm (2), and the turntable (1) of the branch-type crank arm swing arm frame is rotatably connected to the engineering chassis (8).

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