Tunneling working arm and tunneling trolley

Abstract

The tunneling working arm comprises a small arm, a small arm upper oil cylinder and a small arm lower oil cylinder, the small arm upper oil cylinder and the small arm lower oil cylinder are used for driving the small arm and a body of the tunneling trolley to rotate relatively, the small arm upper oil cylinder and the small arm lower oil cylinder are distributed up and down in a vertical plane, and the passive stress states of the small arm upper oil cylinder and the small arm lower oil cylinder are opposite under the action of external force. According to the utility model, the problem that the small arm oil cylinder is pulled out or pulled off in the construction process can be effectively prevented, the stable operation is ensured, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction equipment, in particular to an excavation working arm and an excavation trolley. Background Art

[0002] At present, the existing roadheaders are used in conjunction with breaker hammers or high-frequency hammers. The arrangement of the arm cylinder of the roadheader is usually under the arm or on the arm. During construction, the crawler needs to drive the whole machine forward. Due to the complex working conditions of the roadheader, if the cylinder is only arranged under the arm or on the arm, the arm cylinder will be passively pulled. In this way, the arm will be pulled out or pulled off during the construction process, which will make it impossible to accurately determine the point of crushing, resulting in low construction efficiency and even inability to work. Utility Model Content

[0003] The utility model aims to provide an excavation working arm and an excavation trolley, which can effectively prevent the problem of the arm oil cylinder being pulled out or pulled off during the construction process, ensure stable work and improve work efficiency.

[0004] In order to solve the above technical problems, the utility model adopts the following solutions:

[0005] A tunneling working arm comprises a forearm, an upper forearm oil cylinder and a lower forearm oil cylinder for driving the forearm to rotate relative to a body of a tunneling trolley, wherein the upper forearm oil cylinder and the lower forearm oil cylinder are distributed up and down in a vertical plane, and under the action of external force, the passive force states of the upper forearm oil cylinder and the lower forearm oil cylinder are opposite.

[0006] Optionally, a connecting seat is provided at the bottom of the forearm for hinged connection with the telescopic end of the oil cylinder under the forearm.

[0007] Optionally, the upper cylinder of the forearm is arranged above the lower cylinder of the forearm, the telescopic end of the upper cylinder of the forearm is hinged to the upper end of the forearm adjacent to the vehicle body, and the telescopic end of the lower cylinder of the forearm is hinged to the bottom of the forearm.

[0008] Optionally, it also includes a tunneling hammer, a boom, a connecting rod mechanism, a boom cylinder, and a connecting rod cylinder, wherein one end of the boom is hinged to the body of the tunneling trolley, and the other end is hinged to one end of the forearm, and the other end of the forearm is hinged to the tunneling hammer, the connecting rod mechanism is hinged to the tunneling hammer, the forearm and the connecting rod cylinder respectively, the connecting rod cylinder is hinged to the forearm, one end of the boom cylinder is hinged to the body, and the other end is hinged to the boom, one end of the forearm upper cylinder and the forearm lower cylinder are hinged to the forearm, and the other end is hinged to the boom.

[0009] Optionally, the hinge point between the connecting rod cylinder and the forearm, and the hinge point between the boom cylinder and the boom are both located between the upper cylinder of the forearm and the lower cylinder of the forearm.

[0010] Optionally, the lower rear end of the tunneling hammer is hinged to the front end of the forearm through a first pin, the lower rear end of the forearm is hinged to the front end of the boom through a second pin, and the rear end of the boom is hinged to the vehicle body through a third pin.

[0011] Optionally, the connecting rod mechanism includes a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the upper part of the rear end of the tunneling hammer, and the other end is hinged to one end of the second connecting rod, the other end of the second connecting rod is hinged to the front end of the forearm, and the hinge between the first connecting rod and the second connecting rod is hinged to the telescopic end of the connecting rod cylinder through a fourth pin shaft.

[0012] Optionally, the boom is hinged to the telescopic end of the boom cylinder, and the hinge point between the boom cylinder and the vehicle body is located below the hinge point between the boom and the vehicle body.

[0013] Optionally, a crawler-type walking mechanism for driving the tunneling trolley to move is provided under the vehicle body, and a hydraulic system for controlling the movement of the connecting rod cylinder, the lower cylinder of the forearm, the upper cylinder of the forearm and the boom cylinder is also provided on the vehicle body.

[0014] A tunneling trolley comprises a tunneling working arm as described in any one of the above schemes.

[0015] Due to the adoption of the above technical solution, when the tunneling trolley is working, the cylinder will extend and retract to drive the boom, arm and tunneling hammer to move. The extension and retraction of the boom cylinder can change the angle between the boom and the vehicle body, thereby adjusting the height and excavation depth of the tunneling hammer. The extension and retraction of the upper and lower cylinders of the forearm can change the length and angle of the forearm, so that the tunneling hammer can move and rotate in the horizontal direction to adapt to different excavation needs. The connecting rod mechanism transmits power to the tunneling hammer through the drive of the connecting rod cylinder, so that it generates the impact force and crushing force required for excavation. Under the action of external force, the passive force state of the upper cylinder of the forearm is opposite to that of the lower cylinder of the forearm, which means that when one cylinder is under pressure, the other cylinder will be under tension. This design helps to balance the force of the working arm and improve its stability and reliability. Since the force that the cylinder can withstand under passive pressure is much greater than the force under passive tension, the upper and lower double cylinder structure can meet the requirement that there is always a forearm cylinder under passive pressure under any working condition, so as to prevent the problem of the forearm cylinder being pulled out or pulled off during construction. Since there is always one cylinder under pressure, the cylinder can maintain a large force to ensure that the force position of the hammer tip does not change, thus achieving the purpose of fixed-point crushing. Furthermore, since the cylinder can withstand a large force under passive pressure, the cylinder diameter and rod diameter of the cylinder can be reduced, and the weight of the cylinder can be reduced, thereby correspondingly reducing the cylinder diameter and rod diameter of the boom cylinder, reducing the weight of the cylinder, reducing the flow of the hydraulic system, and being more conducive to the smooth movement of the boom. At the same time, this structure prevents the arm cylinder from being stretched during the crushing process of the tunneling hammer, and the arm cylinder stroke needs to be continuously adjusted.

[0016] The utility model has the beneficial effects:

[0017] 1. In the utility model, this design helps to balance the force of the working arm and improve its stability and reliability. Since the force that the cylinder can withstand under passive pressure is much greater than the force under passive tension, the upper and lower double cylinder structure can meet the requirement that no matter what the working conditions are, there is always one arm cylinder under passive pressure to prevent the arm cylinder from being pulled out or pulled off during construction.

[0018] 2. Since there is always one cylinder under pressure, the cylinder can maintain a large force to ensure that the force position of the hammer tip does not change, thus achieving the purpose of fixed-point crushing.

[0019] 3. Furthermore, since the cylinder can withstand greater force under passive pressure, the cylinder diameter and rod diameter can be reduced, and the weight of the cylinder can be reduced, thereby correspondingly reducing the cylinder diameter and rod diameter of the boom cylinder, reducing the weight of the cylinder, and reducing the flow of the hydraulic system, which is more conducive to the smooth movement of the boom. At the same time, this structure prevents the arm cylinder from being stretched during the crushing process of the tunneling hammer and the need to continuously adjust the arm cylinder stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a structural diagram of the posture at the moment;

[0022] Figure 3 This is a schematic diagram of the structure in posture 2.

[0023] Figure markings: 1-drivage hammer, 2-connecting rod mechanism, 21-first connecting rod, 22-second connecting rod, 3-forearm, 4-connecting rod cylinder, 5-forearm upper cylinder, 6-forearm lower cylinder, 7-boom, 8-boom cylinder, 9-carriage, 10-third pin shaft, 11-second pin shaft, 12-fourth pin shaft, 13-third pin shaft, 14-connecting seat. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0025] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. 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 utility model product is usually placed when in use. They are only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "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.

[0027] Example 1

[0028] A tunneling working arm comprises a tunneling hammer 1, a boom 7, a forearm 3, a connecting rod mechanism 2, a boom cylinder 8, a connecting rod cylinder 4, an upper forearm cylinder 5 and a lower forearm cylinder 6, wherein one end of the boom 7 is hinged to a body 9 of a tunneling trolley, and the other end is hinged to one end of the forearm 3, the other end of the forearm 3 is hinged to the tunneling hammer 1, the connecting rod mechanism 2 is hinged to the tunneling hammer 1, the forearm 3 and the connecting rod cylinder 4 respectively, the connecting rod cylinder 4 is hinged to the forearm 3, one end of the boom cylinder 8 is hinged to the body 9, and the other end is hinged to the boom 7, one end of the upper forearm cylinder 5 and the lower forearm cylinder 6 are hinged to the forearm 3, and the other end is hinged to the boom 7, and the upper forearm cylinder 5 and the lower forearm cylinder 6 are distributed up and down in a vertical plane, and under the action of external force, the passive force states of the upper forearm cylinder 5 and the lower forearm cylinder 6 are opposite.

[0029] In this embodiment, the tunneling hammer 1 is the main working part of the working arm, which is used for tunneling or excavation. The tunneling hammer 1 generally uses an existing high-frequency breaker hammer; the boom 7 and the arm 3 constitute the main structure of the working arm, which are used to support and guide the tunneling hammer 1. One end of the boom 7 is hinged to the body 9 of the tunneling trolley, and the other end is hinged to the arm 3, and the other end of the arm 3 is hinged to the tunneling hammer 1. This design allows the tunneling hammer 1 to move and rotate in multiple directions; the connecting rod mechanism 2 is an important transmission mechanism, which is used to transmit power from the cylinder to the tunneling hammer 1 to make it produce the required action. The connecting rod mechanism 2 is respectively hinged to the tunneling hammer 1, the arm 3 and the connecting rod cylinder 4, which plays the role of transmitting and converting power; the cylinder includes the boom cylinder 8, the connecting rod cylinder 4, the arm upper cylinder 5 and the arm lower cylinder 6. These cylinders provide power to the working arm through telescopic movement, so that it can complete the excavation action.

[0030] like Figure 1 As shown, when the tunneling trolley is working, the cylinder will extend and retract to drive the boom 7, the arm 3 and the tunneling hammer 1 to move. The extension and retraction of the boom cylinder 8 can change the angle between the boom 7 and the vehicle body 9, thereby adjusting the height and excavation depth of the tunneling hammer 1. The extension and retraction of the upper arm cylinder 5 and the lower arm cylinder 6 can change the length and angle of the arm 3, so that the tunneling hammer 1 can move and rotate in the horizontal direction to adapt to different excavation requirements. The connecting rod mechanism 2 transmits power to the tunneling hammer 1 through the drive of the connecting rod cylinder 4, so that it generates the impact force and crushing force required for excavation. Under the action of external force, the passive force state of the upper arm cylinder 5 and the lower arm cylinder 6 is opposite, which means that when one cylinder is under pressure, the other cylinder will be under tension. This design helps to balance the force on the working arm and improve its stability and reliability. Since the force that the cylinder can withstand under passive compression is much greater than the force under passive tension, the upper and lower double cylinder structure can meet the requirement that no matter under any working conditions, there is always one arm 3 cylinder that bears passive compression, preventing the problem of the arm 3 cylinder being pulled out or pulled off during the construction process. Since there is always one cylinder under pressure, the cylinder can maintain a large force to ensure that the force position of the hammer tip does not change, thereby achieving the purpose of fixed-point crushing. Furthermore, since the cylinder can withstand a large force under passive compression, the cylinder diameter and rod diameter of the cylinder can be reduced, and the weight of the cylinder can be reduced, thereby correspondingly reducing the cylinder diameter and rod diameter of the boom cylinder 8, reducing the weight of the cylinder, reducing the flow of the hydraulic system, and being more conducive to the smooth movement of the arm. At the same time, this structure prevents the arm 3 cylinder from being stretched during the crushing process of the tunneling hammer 1, and the arm 3 cylinder stroke needs to be continuously adjusted.

[0031] Furthermore, the upper arm oil cylinder 5 is arranged above the lower arm oil cylinder 6, the telescopic end of the upper arm oil cylinder 5 is hinged to the upper end of the arm 3 adjacent to the vehicle body 9, and the telescopic end of the lower arm oil cylinder 6 is hinged to the bottom of the arm 3. Specifically, due to the different positions and articulation methods of the upper arm oil cylinder 5 and the lower arm oil cylinder 6 on the arm 3, they can work together to achieve flexible movement of the arm 3 in three-dimensional space. For example, by adjusting the telescopic length of the two cylinders at the same time, the position and posture of the arm 3 and the tunneling hammer 1 can be accurately controlled.

[0032] Furthermore, a connection seat 14 is provided at the bottom of the forearm 3 for being hinged to the telescopic end of the oil cylinder 6 under the forearm. Specifically, the connection seat 14 is fixed to the bottom of the forearm 3, providing a stable hinge point for the telescopic end of the oil cylinder 6 under the forearm, which ensures that the telescopic movement of the oil cylinder can be accurately and effectively converted into the movement of the forearm 3.

[0033] Furthermore, the end of the tunneling hammer 1, the small arm 3, and the large arm 7 away from the vehicle body 9 is the front end, and the end adjacent to the vehicle body 9 is the rear end.

[0034] Furthermore, the lower rear end of the tunneling hammer 1 is hinged to the front end of the arm 3 through a first pin 13, the lower rear end of the arm 3 is hinged to the front end of the boom 7 through a second pin 11, and the rear end of the boom 7 is hinged to the vehicle body 9 through a third pin 10.

[0035] Furthermore, the connecting rod mechanism 2 includes a first connecting rod 21 and a second connecting rod 22. One end of the first connecting rod 21 is hinged to the upper rear end of the tunneling hammer 1, and the other end is hinged to one end of the second connecting rod 22. The other end of the second connecting rod 22 is hinged to the front end of the arm 3. The hinge between the first connecting rod 21 and the second connecting rod 22 is hinged to the telescopic end of the connecting rod cylinder 4 through a fourth pin shaft 12.

[0036] Specifically, the main function of the connecting rod mechanism 2 is to convert the telescopic movement of the connecting rod cylinder 4 into a specific motion trajectory of the tunneling hammer 1. When the connecting rod cylinder 4 is extended or retracted, it pushes or pulls the tunneling hammer 1 through the connecting rod mechanism 2, so that it can perform excavation or crushing work. One end of the first connecting rod 21 is hinged to the upper rear end of the tunneling hammer 1, and the other end is hinged to one end of the second connecting rod 22, which means that the movement of the first connecting rod 21 will directly affect the position and posture of the tunneling hammer 1; one end of the second connecting rod 22 is hinged to the first connecting rod 21, and the other end is hinged to the front end of the forearm 3. The function of the second connecting rod 22 is to transmit the movement of the first connecting rod 21 to the forearm 3, thereby adjusting the relative position between the forearm 3 and the tunneling hammer 1.

[0037] When the connecting rod cylinder 4 is extended or retracted, it will push or pull the hinge of the connecting rod mechanism 2, causing the angle between the first connecting rod 21 and the second connecting rod 22 to change. This angle change will further affect the position and posture of the tunneling hammer 1 and the arm 3. By accurately controlling the extension and retraction length and speed of the connecting rod cylinder 4, the movement trajectory and strength of the tunneling hammer 1 can be accurately controlled to adapt to different excavation needs; the connecting rod mechanism 2 needs to withstand various forces and moments generated during the working process, so high-strength, wear-resistant and fatigue-resistant materials should be selected, and the hinge of the connecting rod mechanism 2 requires appropriate lubrication and sealing measures to ensure its long-term and stable performance.

[0038] Furthermore, the telescopic end of the boom 7 and the boom cylinder 8 is hinged, and the hinge point between the boom cylinder 8 and the vehicle body 9 is located below the hinge point between the boom 7 and the vehicle body 9.

[0039] Specifically, the hinge point between the boom cylinder 8 and the vehicle body 9 is located below the hinge point between the boom 7 and the vehicle body 9. This layout forms a cantilever-like structure, which is more stable mechanically because it can better disperse and resist the force and torque from the tunneling hammer 1, reducing the vibration and distortion of the entire working arm. Since the hinge point of the boom cylinder 8 is located at a lower position, when the cylinder is extended or retracted, it will cause the boom 7 to produce a larger displacement in the vertical direction, while the displacement in the horizontal direction is relatively small. This design helps the boom 7 to maintain a more stable motion trajectory during the excavation process, thereby improving the accuracy and efficiency of excavation. Setting the hinge point of the boom cylinder 8 below the hinge point between the boom 7 and the vehicle body 9 helps to avoid interference and conflict between the cylinder and other components (such as the forearm 3, tunneling hammer 1, etc.) during the excavation process, which ensures the smooth operation of the working arm during the excavation process.

[0040] Furthermore, if Figure 1As shown, the connecting rod cylinder 4 is an important component connecting the forearm 3 and the boom 7, which is responsible for adjusting the angle and position of the forearm 3 relative to the boom 7. The hinge point between the connecting rod cylinder 4 and the forearm 3 is the key point for transmitting force and rotation between them. The boom cylinder 8 is the main component driving the movement of the boom 7. The hinge point between it and the boom 7 determines the rotation mode and range of the boom 7. These two hinge points are located between the forearm upper cylinder 5 and the forearm lower cylinder 6. Setting the hinge point between the forearm upper cylinder 5 and the forearm lower cylinder 6 helps to maintain the overall stability when the working arm is stressed. Due to the telescopic movement of the cylinder, the stress state of the working arm will change continuously, and the position of the hinge point helps to disperse and balance these forces, reducing the stress concentration and deformation caused by uneven stress. This design can make the movement of the connecting rod cylinder 4 and the boom cylinder 8 more coordinated. Since the hinge point is located between the cylinders, the telescopic movement of the cylinder can be more effectively converted into the rotation of the forearm 3 and the boom 7, improving the flexibility and response speed of the working arm. Setting the hinge point between the cylinders also helps to achieve a compact structure for the excavation arm, which not only reduces the space occupied by the arm but also helps to improve the overall stability and operating efficiency of the excavation vehicle.

[0041] In summary, the design in which the hinge points of the connecting rod cylinder 4 and the forearm 3 and the hinge points of the boom cylinder 8 and the boom 7 are both located between the forearm upper cylinder 5 and the forearm lower cylinder 6 fully considers factors such as the force balance, movement coordination and structural compactness of the working arm, and helps to improve the operating performance and service life of the tunneling trolley.

[0042] Furthermore, a crawler-type walking mechanism for driving the excavation trolley to move is provided under the vehicle body 9, and a hydraulic system for controlling the movement of the connecting rod cylinder 4, the lower arm cylinder 6, the upper arm cylinder 5 and the boom cylinder 8 is also provided on the vehicle body 9.

[0043] Specifically, the crawler-type walking mechanism (not shown in the figure) belongs to the prior art, which is located under the vehicle body 9 and is mainly responsible for driving the tunneling trolley to travel on various terrains. Through the rotation and advancement of the crawler tracks, the tunneling trolley can move stably on uneven ground, providing the necessary maneuverability for excavation operations.

[0044] The existing crawler-type walking mechanism usually includes a crawler, a driving wheel, a tensioning wheel, a supporting wheel and a related transmission mechanism. The crawler is wrapped around the driving wheel and the tensioning wheel, and the trolley is driven forward or backward by the rotation of the driving wheel.

[0045] Compared with the wheeled traveling mechanism, the crawler traveling mechanism has better off-road capability and terrain adaptability. It can work stably on complex terrains such as soft soil, sand, and gravel, ensuring the operating efficiency and safety of the excavation trolley.

[0046] The hydraulic system (not shown in the figure) also belongs to the prior art and is a commonly used component on engineering vehicles. It is located on the vehicle body 9 and is responsible for controlling the actions of the connecting rod cylinder 4, the lower arm cylinder 6, the upper arm cylinder 5 and the boom cylinder 8. Through the flow and pressure control of the hydraulic oil, the hydraulic system can accurately drive the extension and rotation of each cylinder, thereby achieving precise control of the excavation working arm and efficient excavation.

[0047] Existing hydraulic systems usually include hydraulic pumps, oil tanks, control valves, oil cylinders, and related pipes and joints. The hydraulic pump is responsible for providing high-pressure hydraulic oil, and the control valve is responsible for adjusting the flow direction and pressure of the hydraulic oil, thereby achieving precise control of the oil cylinder. The hydraulic system has the advantages of compact structure, flexible movement, and precise control. It can achieve complex excavation actions through simple operations, improve excavation efficiency and quality, and at the same time, the maintenance of the hydraulic system is relatively simple and can adapt to harsh working environments.

[0048] In summary, the crawler walking mechanism provides the tunneling trolley with stable mobility, while the hydraulic system provides precise power and control for the efficient excavation of the tunneling working arm. The coordinated work of these two parts enables the tunneling trolley to achieve efficient and safe excavation operations in various complex environments.

[0049] Example 2

[0050] A tunneling trolley comprises a tunneling working arm as described in any one of the above schemes.

[0051] In this embodiment, the excavation working arm in Example 1 is installed on the body 9 of the excavation trolley. When it is working: the extension and retraction of the boom cylinder 8 can change the angle between the boom 7 and the body 9, thereby adjusting the height and excavation depth of the excavation hammer 1. The extension and retraction of the upper arm cylinder 5 and the lower arm cylinder 6 can change the length and angle of the arm 3, so that the excavation hammer 1 can move and rotate in the horizontal direction to adapt to different excavation needs. The connecting rod mechanism 2 transmits power to the excavation hammer 1 through the drive of the connecting rod cylinder 4, so that it generates the impact force and crushing force required for excavation. Under the action of external force, the passive force state of the upper arm cylinder 5 and the lower arm cylinder 6 is opposite, which means that when one cylinder is under pressure, the other cylinder will be under tension. This design helps to balance the force on the working arm and improve its stability and reliability. Figure 2 As shown, in the first posture, under the action of external force, the upper cylinder 5 of the forearm is passively compressed, and the lower cylinder 6 of the forearm is passively pulled; Figure 3 As shown, in posture 2, under the action of external force, the upper cylinder 5 of the forearm is passively pulled, and the lower cylinder 6 of the forearm is passively compressed. Since there is always one cylinder under pressure, the cylinder can maintain a large force to ensure that the force position of the hammer tip does not change, thereby achieving the purpose of fixed-point crushing.

[0052] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.

Claims

1. A tunneling working arm, characterized in that: The invention comprises a forearm (3), an upper forearm oil cylinder (5) for driving the forearm (3) and a body (9) of a tunneling vehicle to rotate relative to each other, and a lower forearm oil cylinder (6), wherein the upper forearm oil cylinder (5) and the lower forearm oil cylinder (6) are distributed upward and downward in a vertical plane, and under the action of an external force, the passive force states of the upper forearm oil cylinder (5) and the lower forearm oil cylinder (6) are opposite.

2. A tunneling working arm according to claim 1, characterized in that: The bottom of the forearm (3) is provided with a connecting seat (14) for being hingedly connected to the telescopic end of the oil cylinder (6) under the forearm.

3. A tunneling working arm according to claim 2, characterized in that: The upper oil cylinder (5) of the forearm is arranged above the lower oil cylinder (6) of the forearm, the telescopic end of the upper oil cylinder (5) of the forearm is hinged to the upper part of one end of the forearm (3) adjacent to the vehicle body (9), and the telescopic end of the lower oil cylinder (6) of the forearm is hinged to the bottom of the forearm (3).

4. The excavation working arm according to claim 1, characterized in that: The invention also comprises a tunneling hammer (1), a boom (7), a connecting rod mechanism (2), a boom cylinder (8), and a connecting rod cylinder (4); one end of the boom (7) is hinged to the body (9) of the tunneling trolley, and the other end is hinged to one end of a forearm (3); the other end of the forearm (3) is hinged to the tunneling hammer (1); the connecting rod mechanism (2) is hinged to the tunneling hammer (1), the forearm (3) and the connecting rod cylinder (4) respectively; the connecting rod cylinder (4) is hinged to the forearm (3); one end of the boom cylinder (8) is hinged to the body (9), and the other end is hinged to the boom (7); one end of the forearm upper cylinder (5) and the forearm lower cylinder (6) are hinged to the forearm (3), and the other end is hinged to the boom (7).

5. The excavation working arm according to claim 4, characterized in that: The hinge point between the connecting rod oil cylinder (4) and the forearm (3), and the hinge point between the upper arm oil cylinder (8) and the upper arm (7) are both located between the upper arm oil cylinder (5) and the lower arm oil cylinder (6).

6. The excavation working arm according to claim 4, characterized in that: The lower rear end of the tunneling hammer (1) is hinged to the front end of the forearm (3) via a first pin shaft, the lower rear end of the forearm (3) is hinged to the front end of the boom (7) via a second pin shaft (11), and the rear end of the boom (7) is hinged to the vehicle body (9) via a third pin shaft (10).

7. The excavation working arm according to claim 4, characterized in that: The connecting rod mechanism (2) comprises a first connecting rod (21) and a second connecting rod (22); one end of the first connecting rod (21) is hinged to the upper rear end of the tunneling hammer (1), and the other end is hinged to one end of the second connecting rod (22); the other end of the second connecting rod (22) is hinged to the front end of the arm (3); the hinged joint of the first connecting rod (21) and the second connecting rod (22) is hinged to the telescopic end of the connecting rod cylinder (4) via a fourth pin shaft (12).

8. The excavation working arm according to claim 4, characterized in that: The telescopic end of the boom (7) and the boom oil cylinder (8) are hinged, and the hinge point of the boom oil cylinder (8) and the vehicle body (9) is located below the hinge point of the boom (7) and the vehicle body (9).

9. The excavation working arm according to claim 4, characterized in that: A crawler-type walking mechanism for driving the excavation trolley to travel is provided below the vehicle body (9), and a hydraulic system for controlling the movement of the connecting rod cylinder (4), the lower arm cylinder (6), the upper arm cylinder (5) and the upper arm cylinder (8) is also provided on the vehicle body (9).

10. A tunneling trolley, characterized in that: It comprises a tunneling working arm as described in any one of claims 1-9.

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