Operating arm with built-in oil passage

Abstract

This utility model relates to the field of operating arm technology, and more particularly to an operating arm with built-in hydraulic circuits. The device includes a mounting base plate, a steering base fixedly connected to the top surface of the mounting base plate, a support column rotatably connected to the top surface of the steering base, a first connecting plate symmetrically rotatably connected to the top of the support column, a lifting arm welded and fixed to the inner side of the first connecting plate, a lifting cylinder hinged to the inner side of the support column, and a second connecting plate symmetrically welded and fixed to the end of the lifting arm. This utility model reduces the space occupied by external hydraulic pipes by embedding multiple sets of hydraulic pipes inside the arm segments and joints of the operating arm, improving the flexibility of the operating arm's operation. During movement, it will not interfere with external hydraulic pipes, improving the operating efficiency of the operating arm. Furthermore, the built-in hydraulic circuits reduce the risk of damage to the hydraulic pipes in complex environments, increasing the service life of the operating arm and thus reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of operating arm technology, and in particular to an operating arm with a built-in oil circuit. Background Technology

[0002] A manipulator is a mechanical device that mimics the movements of a human arm. It consists of multiple arm segments connected by joints and can achieve multiple degrees of freedom of movement such as rotation, extension, and pitch. It can be equipped with actuators to complete tasks such as grasping, handling, and assembly. It is widely used in industrial manufacturing, logistics, medical and other fields. Hydraulically driven manipulators have advantages such as smooth movement, large load capacity, good speed and stepless speed regulation, and perform well in heavy-duty operations such as underwater operations and heavy material handling.

[0003] Existing hydraulic booms typically have their oil supply pipes located on the outside. This not only results in a bulky overall boom, but also makes the external oil pipes prone to interference with external objects during operation, severely affecting the boom's flexibility and work efficiency. Furthermore, the external oil pipes are easily damaged in complex environments, reducing the boom's reliability and lifespan, and increasing maintenance costs.

[0004] Therefore, this utility model proposes an operating arm with a built-in oil circuit. Utility Model Content

[0005] Therefore, in order to overcome the common problems of hydraulic booms having their oil supply pipes located on the outside, resulting in a large overall size of the boom, and the fact that external oil pipes are prone to interference with external objects during operation, affecting the boom's flexibility and work efficiency, and that external oil pipes are easily damaged in complex environments, reducing the boom's service life and increasing maintenance costs, a new approach is needed.

[0006] The technical solution of this utility model is as follows: an operating arm with a built-in oil circuit includes a mounting base plate, a steering base fixedly connected to the top surface of the mounting base plate, a support column rotatably connected to the top surface of the steering base, a first connecting plate symmetrically rotatably connected to the top of the support column, a lifting arm welded and fixed to the inner side of the first connecting plate, a lifting cylinder hinged to the inner side of the support column, a second connecting plate symmetrically welded and fixed to the end of the lifting arm, a third connecting plate symmetrically rotatably connected to the end of the second connecting plate, and a lifting forearm welded and fixed to the inner side of the third connecting plate.

[0007] Preferably, the lifting cylinder is located at the inner bottom end of the support column, the output end of the lifting cylinder is rotatably connected to the inner bottom end of the first connecting plate, and the second connecting plate is located on the outer side of the third connecting plate.

[0008] Preferably, mounting plates are symmetrically welded and fixed at the center of the outer side of the lifting boom. A tilting cylinder is rotatably connected to the inner wall of the mounting plate via a rotating shaft. The output end of the tilting cylinder is symmetrically connected to a first connecting rod and a second connecting rod via a rotating shaft. The second connecting rod is located outside the first connecting rod. The end of the first connecting rod is rotatably connected to the center of the side of the second connecting plate. The end of the second connecting rod is rotatably connected to the bottom side of the third connecting plate.

[0009] Preferably, a support base is welded and fixed to the top surface of the end of the lifting arm, a first telescopic arm is slidably connected to the inner wall of the end of the lifting arm, a connecting base is fixedly connected to the outer side of the end of the first telescopic arm, a first stroke cylinder is fixedly connected to the inner side of the top of the third connecting plate, the output end of the first stroke cylinder is fixedly connected to the inner wall of the connecting base, and the first stroke cylinder is disposed on the top surface of the support base.

[0010] Preferably, a second telescopic arm is slidably connected to the inner wall of the end of the first telescopic arm, and a second stroke cylinder is fixedly connected to the inner wall of the end of the second telescopic arm. The output end of the second stroke cylinder is fixedly connected to the inner wall of the end of the first telescopic arm away from the connecting seat.

[0011] Preferably, a first proportional valve is fixedly connected to the inner wall of the lifting boom. The first proportional valves are symmetrically distributed on the lifting boom. The input end of the first proportional valve is connected to a main oil pipe, and the output end of the first proportional valve is connected to a tilting oil pipe. The end of the tilting oil pipe is connected to the oil port of the tilting cylinder.

[0012] Preferably, a second proportional valve is fixedly connected to the inner wall of the lifting arm near the tilting cylinder. A secondary oil pipe is symmetrically connected to the input end of the second proportional valve. The end of the secondary oil pipe is connected to the output end of the first proportional valve. A first oil pipe is symmetrically connected to the output end of the second proportional valve. The first oil pipe is connected to the oil port of the first stroke cylinder. A second oil pipe is symmetrically connected to the output end of the second proportional valve. The second oil pipe is connected to the oil port of the second stroke cylinder.

[0013] Preferably, the bottom surface of the mounting base plate is provided with a mounting base, the mounting base plate is connected and fixed to the mounting base by bolts, the bottom surface of the mounting base is welded and fixed with a connecting frame, and the inner wall of the connecting frame is slidably connected with a sliding telescopic frame, the sliding telescopic frame being symmetrically distributed on the connecting frame.

[0014] Preferably, a connecting leg is welded and fixed to the end of the sliding telescopic frame, a support leg is slidably connected to the inner wall of the connecting leg, a support foot is welded and fixed to the bottom surface of the support leg, a third stroke cylinder is fixedly connected to the inner wall of the top of the connecting leg, and the end of the third stroke cylinder is fixedly connected to the inner wall of the bottom end of the support leg.

[0015] The beneficial effects of this utility model are: 1. When using this type of operating arm with built-in hydraulic circuit, if it is necessary to adjust the tilting angle of the lifting arm, hydraulic oil is delivered to the first proportional valve through the main oil pipe. The first proportional valve adjusts the flow rate and pressure of the hydraulic oil output to the tilting oil pipe according to the control signal. Then, the hydraulic oil is delivered to the oil port of the tilting cylinder through the tilting oil pipe, thereby controlling the extension and retraction of the tilting cylinder. This causes the output end of the cylinder to drive the first connecting rod and the second connecting rod to move. Under the action of the lever principle, the movement of the first connecting rod and the second connecting rod is converted into the relative rotation of the second connecting plate and the third connecting plate, thereby realizing the tilting action of the lifting arm relative to the lifting boom, so as to adjust the working angle of the lifting arm. 2. When using this type of operating arm with built-in hydraulic circuit, if it is necessary to adjust the working radius of the operating arm, the hydraulic oil output from the first proportional valve is delivered to the second proportional valve through the auxiliary oil pipe, and the hydraulic oil is delivered to the oil port of the first stroke cylinder through the first oil pipe, controlling the extension and retraction of the first stroke cylinder, generating a pushing or pulling force on the connecting seat, thereby driving the first telescopic arm to slide along the inner wall of the end of the lifting arm, realizing the extension or retraction of the first telescopic arm, thereby changing the working radius of the operating arm. When it is necessary to further expand the working range, the hydraulic oil is delivered to the oil port of the second stroke cylinder through the second oil pipe, controlling the extension and retraction of the second stroke cylinder, pushing or pulling the first telescopic arm and the second telescopic arm to move relative to each other, thereby realizing the extension or retraction of the second telescopic arm, thereby further expanding the working range of the operating arm; 3. When in use, this type of manipulator with built-in oil circuits reduces the space occupied by external oil pipes by embedding multiple sets of oil circuits inside each section and joint of the manipulator. This allows the manipulator to be more flexibly arranged and applied in work environments with high space requirements, expanding the applicability of the manipulator. During operation, it will not interfere with external oil pipes, improving work efficiency. Furthermore, the built-in oil circuits can reduce the risk of oil pipes being damaged in complex environments, improving the reliability and service life of the manipulator and reducing maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention. Figure 2The diagram shown is a three-dimensional structural schematic of the support column of this utility model. Figure 3 The diagram shown is a three-dimensional structural schematic of the lifting cylinder of this utility model; Figure 4 The diagram shown is a three-dimensional structural schematic of the tilting cylinder of this utility model. Figure 5 The diagram shown is a three-dimensional structural schematic of the first-stroke hydraulic cylinder of this utility model; Figure 6 The diagram shown is a three-dimensional structural schematic of the second-stroke hydraulic cylinder of this utility model; Figure 7 The diagram shown is a three-dimensional structural schematic of the connecting leg of this utility model; Figure 8 The diagram shown is a three-dimensional structural schematic of the third-stroke hydraulic cylinder of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Mounting base plate; 2. Steering base; 3. Support column; 4. First connecting plate; 5. Lifting boom; 6. Lifting cylinder; 7. Second connecting plate; 8. Third connecting plate; 9. Lifting forearm; 10. Mounting plate; 11. Tilting cylinder; 12. First connecting rod; 13. Second connecting rod; 14. Support seat; 15. First telescopic boom; 16. Connecting seat; 17. First stroke cylinder; 18. Second telescopic boom; 19. Second stroke cylinder; 20. First proportional valve; 21. Main oil pipe; 22. Tilting oil pipe; 23. Second proportional valve; 24. Auxiliary oil pipe; 25. First oil pipe; 26. Second oil pipe; 27. Mounting base; 28. Connecting frame; 29. ​​Sliding telescopic frame; 30. Connecting leg; 31. Support leg; 32. Support foot; 33. Third stroke cylinder. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0021] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0022] Please see Figures 1-8 This utility model provides an embodiment: an operating arm with a built-in oil circuit, including a mounting base plate 1, a steering base 2 fixedly connected to the top surface of the mounting base plate 1, a support column 3 rotatably connected to the top surface of the steering base 2, a first connecting plate 4 symmetrically rotatably connected to the top end of the support column 3, a lifting arm 5 welded and fixed to the inner side of the first connecting plate 4, a lifting cylinder 6 hinged to the inner side of the support column 3, a second connecting plate 7 symmetrically welded and fixed to the end of the lifting arm 5, a third connecting plate 8 symmetrically rotatably connected to the end of the second connecting plate 7, and a lifting arm 9 welded and fixed to the inner side of the third connecting plate 8.

[0023] The lifting cylinder 6 is located at the inner bottom end of the support column 3. The output end of the lifting cylinder 6 is rotatably connected to the inner bottom end of the first connecting plate 4. The second connecting plate 7 is located on the outer side of the third connecting plate 8. The mounting base plate 1 provides stable support for the entire operating arm. When it is necessary to adjust the working direction of the operating arm, the hydraulic drive component inside the steering base 2 is used to drive the support column 3 to rotate horizontally around the mounting base plate 1 through hydraulic pressure, thereby realizing the adjustment of the working direction of the operating arm. When the lifting cylinder 6 is working, the extension and retraction of its output end will generate a pushing or pulling force on the first connecting plate 4, causing the first connecting plate 4 to rotate around the connection point at the top of the support column 3, thereby driving the lifting arm 5 to complete the lifting or lowering action. The rotational connection between the second connecting plate 7 at the end of the lifting arm 5 and the third connecting plate 8 allows the lifting arm 9 to flip relative to the lifting arm 5, creating conditions for adjusting the working angle of the operating arm.

[0024] A mounting plate 10 is symmetrically welded and fixed at the center of the outer side of the lifting boom 5. A tilting cylinder 11 is rotatably connected to the inner wall of the mounting plate 10 via a rotating shaft. The output end of the tilting cylinder 11 is symmetrically connected to a first connecting rod 12 and a second connecting rod 13 via a rotating shaft. The second connecting rod 13 is located outside the first connecting rod 12. The end of the first connecting rod 12 is rotatably connected to the center of the side of the second connecting plate 7, and the end of the second connecting rod 13 is rotatably connected to the bottom side of the third connecting plate 8. The mounting plate 10 provides a stable mounting support point for the tilting cylinder 11. When adjustment of the lifting boom is required... When the lifting arm 9 is tilted, the output end of the tilting cylinder 11 is extended or retracted, which drives the first connecting rod 12 and the second connecting rod 13 to move. Since the end of the first connecting rod 12 is rotatably connected to the center of the side of the second connecting plate 7, and the end of the second connecting rod 13 is rotatably connected to the bottom side of the third connecting plate 8, under the action of the lever principle, the movement of the first connecting rod 12 and the second connecting rod 13 will be converted into the relative rotation of the second connecting plate 7 and the third connecting plate 8, thereby realizing the tilting action of the lifting arm 9 relative to the lifting boom 5, so as to adjust the working angle of the lifting arm 9.

[0025] A support base 14 is welded and fixed to the top surface of the end of the lifting arm 9. A first telescopic arm 15 is slidably connected to the inner wall of the end of the lifting arm 9. A connecting seat 16 is fixedly connected to the outer side of the end of the first telescopic arm 15. A first stroke cylinder 17 is fixedly connected to the inner side of the top of the third connecting plate 8. The output end of the first stroke cylinder 17 is fixedly connected to the inner wall of the connecting seat 16. The first stroke cylinder 17 is set on the top surface of the support base 14. The support base 14 provides auxiliary support for the first stroke cylinder 17, enhancing the stability of the first stroke cylinder 17 during operation. When it is necessary to adjust the working radius of the operating arm, by controlling the extension and retraction of the output end of the first stroke cylinder 17, a pushing or pulling force will be generated on the connecting seat 16, thereby driving the first telescopic arm 15 to slide along the inner wall of the end of the lifting arm 9, realizing the extension or retraction of the first telescopic arm 15, thereby changing the working radius of the operating arm.

[0026] The inner wall of the end of the first telescopic arm 15 is slidably connected to the second telescopic arm 18. The inner wall of the end of the second telescopic arm 18 is fixedly connected to the second stroke cylinder 19. The output end of the second stroke cylinder 19 is fixedly connected to the inner wall of the end of the first telescopic arm 15 away from the connecting seat 16. When it is necessary to further expand the working range, by controlling the output end of the second stroke cylinder 19 to extend or retract, the first telescopic arm 15 and the second telescopic arm 18 will be directly pushed or pulled to make relative movement, thereby realizing the extension or retraction of the second telescopic arm 18, which can further expand the working range of the operating arm.

[0027] A first proportional valve 20 is fixedly connected to the inner wall of the lifting boom 5. The first proportional valves 20 are symmetrically distributed on the lifting boom 5. The input end of the first proportional valve 20 is connected to the main oil pipe 21, and the output end of the first proportional valve 20 is connected to the tilting oil pipe 22. The end of the tilting oil pipe 22 is connected to the oil port of the tilting cylinder 11. Hydraulic oil is delivered to the first proportional valve 20 through the main oil pipe 21. When it is necessary to control the movement of the lifting arm 9, the first proportional valve 20 adjusts the flow rate and pressure of the hydraulic oil output to the tilting oil pipe 22 according to the control signal. Then, the hydraulic oil is delivered to the oil port of the tilting cylinder 11 through the tilting oil pipe 22, thereby controlling the extension and retraction of the tilting cylinder 11 and realizing the lifting and lowering control of the lifting arm 9.

[0028] A second proportional valve 23 is fixedly connected to the inner wall of the lifting arm 9 near the tilting cylinder 11. A secondary oil pipe 24 is symmetrically connected to the input end of the second proportional valve 23. The end of the secondary oil pipe 24 is connected to the output end of the first proportional valve 20. A first oil pipe 25 is symmetrically connected to the output end of the second proportional valve 23. The first oil pipe 25 is connected to the oil port of the first stroke cylinder 17. A second oil pipe 26 is symmetrically connected to the output end of the second proportional valve 23. The second oil pipe 26 is connected to the oil port of the second stroke cylinder 19. The first proportional valve 20 is connected to the secondary oil pipe 24. The output hydraulic oil is delivered to the second proportional valve 23. The second proportional valve 23 adjusts the flow rate and pressure of the hydraulic oil output to the first oil pipe 25 and the second oil pipe 26 according to the control command. The hydraulic oil is delivered to the oil port of the first stroke cylinder 17 through the first oil pipe 25 to control the extension and retraction of the first stroke cylinder 17, thereby controlling the movement of the first telescopic arm 15. The hydraulic oil is delivered to the oil port of the second stroke cylinder 19 through the second oil pipe 26 to control the extension and retraction of the second stroke cylinder 19, thereby controlling the movement of the second telescopic arm 18, so that the telescopic arm is held in the required position or retracted to its original position.

[0029] The bottom surface of the mounting base plate 1 is provided with a mounting base 27. The mounting base plate 1 is connected and fixed to the mounting base 27 by bolts. A connecting frame 28 is welded and fixed to the bottom surface of the mounting base 27. A sliding telescopic frame 29 is slidably connected to the inner wall of the connecting frame 28. The sliding telescopic frame 29 is symmetrically distributed on the connecting frame 28. The mounting base 27 and the mounting base plate 1 are firmly connected by bolts, providing stable installation support for the entire operating arm. The sliding telescopic frame 29, which is slidably connected to the inner wall of the connecting frame 28, facilitates the adjustment of the horizontal spacing of the connecting legs 30, so that the operating arm can be placed stably to adapt to the width requirements of different work sites and enhance the stability of the operating arm during operation.

[0030] A connecting leg 30 is welded and fixed to the end of the sliding telescopic frame 29. A support leg 31 is slidably connected to the inner wall of the connecting leg 30. A support foot 32 is welded and fixed to the bottom surface of the support leg 31. A third-stroke cylinder 33 is fixedly connected to the inner wall of the top of the connecting leg 30. The end of the third-stroke cylinder 33 is fixedly connected to the inner wall of the bottom end of the support leg 31. Before the operating arm starts working, the output end of the third-stroke cylinder 33 is extended, which pushes the support leg 31 to slide along the inner wall of the connecting leg 30 until the support foot 32 smoothly contacts the ground and applies a certain pressure to ensure the stability of the operating arm. By increasing the contact area between the device and the ground through the support foot 32, the weight of the operating arm can be effectively distributed, enhancing the stability of the operating arm during heavy-load operations and preventing the operating arm from tipping over. After the operation is completed, the output end of the third-stroke cylinder 33 is retracted, driving the support leg 31 back into the connecting leg 30, so that the support foot 32 leaves the ground.

[0031] Working principle: According to Figures 1-3 and Figures 7-8 As shown, before the operating arm starts working, the mounting base 27 is firmly connected to the mounting base plate 1 by bolts to provide a stable installation support for the entire operating arm. According to the width requirements of different work sites, the horizontal distance of the connecting legs 30 is adjusted by the sliding telescopic frame 29 connected to the inner wall of the connecting frame 28. The support leg 31 is pushed to slide along the inner wall of the connecting leg 30 by the output end of the control third stroke cylinder 33 until the support foot 32 smoothly contacts the ground and applies a certain pressure, thereby enhancing the stability of the operating arm during operation. according to Figures 2-3 As shown, when it is necessary to adjust the working direction of the operating arm, the hydraulic drive component inside the steering base 2 is used to drive the support column 3 to rotate horizontally around the mounting base plate 1 through hydraulic pressure, thereby realizing the adjustment of the working direction of the operating arm. When it is necessary to control the movement of the lifting boom 5, the lifting cylinder 6 is controlled to work. Its output end extension and retraction will generate a pushing or pulling force on the first connecting plate 4, causing the first connecting plate 4 to rotate around the connection point at the top of the support column 3, thereby driving the lifting boom 5 to complete the lifting or lowering action. according to Figures 4-5As shown, the mounting plate 10 provides a stable mounting support point for the tilting cylinder 11. When it is necessary to adjust the tilting angle of the lifting arm 9, hydraulic oil is delivered to the first proportional valve 20 through the main oil pipe 21. The first proportional valve 20 adjusts the hydraulic oil flow and pressure output to the tilting oil pipe 22 according to the control signal. Then, the hydraulic oil is delivered to the oil port of the tilting cylinder 11 through the tilting oil pipe 22, thereby controlling the extension and retraction of the tilting cylinder 11. This causes its output end to drive the first connecting rod 12 and the second connecting rod 13 to move. Under the action of the lever principle, the movement of the first connecting rod 12 and the second connecting rod 13 will be converted into the relative rotation of the second connecting plate 7 and the third connecting plate 8, thereby realizing the tilting action of the lifting arm 9 relative to the lifting boom 5, so as to adjust the working angle of the lifting arm 9. according to Figures 5-6 As shown, the support base 14 provides auxiliary support for the first stroke cylinder 17, enhancing its stability during operation. When the working radius of the operating arm needs to be adjusted, the hydraulic oil output from the first proportional valve 20 is delivered to the second proportional valve 23 via the auxiliary oil pipe 24. The second proportional valve 23 adjusts the flow rate and pressure of the hydraulic oil output to the first oil pipe 25 and the second oil pipe 26 according to the control command. The hydraulic oil is then delivered to the oil port of the first stroke cylinder 17 via the first oil pipe 25, controlling the extension and retraction of the first stroke cylinder 17. This affects the connection base 1. 6 generates thrust or pull force, thereby driving the first telescopic arm 15 to slide along the inner wall of the end of the lifting arm 9, realizing the extension or retraction of the first telescopic arm 15, thereby changing the working radius of the operating arm. When it is necessary to further expand the working range, hydraulic oil is delivered to the oil port of the second stroke cylinder 19 through the second oil pipe 26, controlling the extension and retraction of the second stroke cylinder 19, pushing or pulling the first telescopic arm 15 and the second telescopic arm 18 to move relative to each other, thereby realizing the extension or retraction of the second telescopic arm 18, thereby further expanding the working range of the operating arm. Among them, the lifting cylinder 6, the tilting cylinder 11, the first stroke cylinder 17, the second stroke cylinder 19, the first proportional valve 20, the second proportional valve 23, and the third stroke cylinder 33 are existing technologies on the market and will not be described in detail here.

[0032] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An operating arm with built-in oil passage, comprising a mounting base plate (1), characterized in that: The top surface of the mounting base plate (1) is fixedly connected to a steering base (2), the top surface of the steering base (2) is rotatably connected to a support column (3), the top end of the support column (3) is symmetrically rotatably connected to a first connecting plate (4), the inner side of the first connecting plate (4) is welded and fixed to a lifting arm (5), the inner side of the support column (3) is hinged to a lifting cylinder (6), the end of the lifting arm (5) is symmetrically welded and fixed to a second connecting plate (7), the end of the second connecting plate (7) is symmetrically rotatably connected to a third connecting plate (8), the inner side of the third connecting plate (8) is welded and fixed to a lifting arm (9).

2. The operating arm with built-in oil passage according to claim 1, characterized in that: The lifting cylinder (6) is located at the bottom inner end of the support column (3). The output end of the lifting cylinder (6) is rotatably connected to the inner bottom end of the first connecting plate (4). The second connecting plate (7) is located on the outer side of the third connecting plate (8).

3. The operating arm with built-in oil passage according to claim 1, characterized in that: A mounting plate (10) is symmetrically welded and fixed at the center of the outer side of the lifting boom (5). A tilting cylinder (11) is rotatably connected to the inner wall of the mounting plate (10) via a rotating shaft. A first connecting rod (12) and a second connecting rod (13) are symmetrically connected to the output end of the tilting cylinder (11) via a rotating shaft. The second connecting rod (13) is located on the outer side of the first connecting rod (12). The end of the first connecting rod (12) is rotatably connected to the center of the side of the second connecting plate (7). The end of the second connecting rod (13) is rotatably connected to the bottom side of the third connecting plate (8).

4. The operating arm with built-in oil passage according to claim 1, characterized in that: A support base (14) is welded and fixed to the top surface of the end of the lifting arm (9). A first telescopic arm (15) is slidably connected to the inner wall of the end of the lifting arm (9). A connecting seat (16) is fixedly connected to the outer side of the end of the first telescopic arm (15). A first stroke cylinder (17) is fixedly connected to the inner side of the top of the third connecting plate (8). The output end of the first stroke cylinder (17) is fixedly connected to the inner wall of the connecting seat (16). The first stroke cylinder (17) is set on the top surface of the support base (14).

5. The operating arm with built-in oil passage according to claim 4, characterized in that: The inner wall of the end of the first telescopic arm (15) is slidably connected to the second telescopic arm (18), and the inner wall of the end of the second telescopic arm (18) is fixedly connected to the second stroke cylinder (19). The output end of the second stroke cylinder (19) is fixedly connected to the inner wall of the end of the first telescopic arm (15) away from the connecting seat (16).

6. The operating arm with built-in oil passage according to claim 3, characterized in that: The inner wall of the lifting boom (5) is fixedly connected to a first proportional valve (20). The first proportional valve (20) is symmetrically distributed on the lifting boom (5). The input end of the first proportional valve (20) is connected to a main oil pipe (21), and the output end of the first proportional valve (20) is connected to a tilting oil pipe (22). The end of the tilting oil pipe (22) is connected to the oil port of the tilting cylinder (11).

7. The operating arm with built-in oil passage according to claim 6, characterized in that: A second proportional valve (23) is fixedly connected to the inner wall of the lifting arm (9) near the tilting cylinder (11). A secondary oil pipe (24) is symmetrically connected to the input end of the second proportional valve (23). The end of the secondary oil pipe (24) is connected to the output end of the first proportional valve (20). A first oil pipe (25) is symmetrically connected to the output end of the second proportional valve (23). The first oil pipe (25) is connected to the oil port of the first stroke cylinder (17). A second oil pipe (26) is symmetrically connected to the output end of the second proportional valve (23). The second oil pipe (26) is connected to the oil port of the second stroke cylinder (19).

8. The operating arm with built-in oil passage according to claim 1, characterized in that: The mounting base (1) is provided with a mounting base (27) on its bottom surface. The mounting base (1) is connected and fixed to the mounting base (27) by bolts. A connecting frame (28) is welded and fixed to the bottom surface of the mounting base (27). A sliding telescopic frame (29) is slidably connected to the inner wall of the connecting frame (28). The sliding telescopic frame (29) is symmetrically distributed on the connecting frame (28).

9. The operating arm with built-in oil passage according to claim 8, characterized in that: The sliding telescopic frame (29) has a connecting leg (30) welded and fixed at its end. A support leg (31) is slidably connected to the inner wall of the connecting leg (30). A support foot (32) is welded and fixed to the bottom surface of the support leg (31). A third stroke cylinder (33) is fixedly connected to the inner wall of the top of the connecting leg (30). The end of the third stroke cylinder (33) is fixedly connected to the inner wall of the bottom end of the support leg (31).

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