Cargo boom for operation machinery

Abstract

The invention discloses a cargo boom for an operation machine. The cargo boom comprises a main boom and an auxiliary boom, the main arm comprises a main basic arm and a main telescopic arm, and the main telescopic arm can retract into the main basic arm or extend out of the main basic arm; the auxiliary arm is used for hoisting a heavy object, the auxiliary arm can rotate relative to the main arm, the auxiliary arm comprises an auxiliary basic arm and an auxiliary telescopic arm, and the auxiliary telescopic arm can retract into the auxiliary basic arm or extend out of the auxiliary basic arm. The main arm can be adopted for supporting, the auxiliary arm serves as an operation arm for hoisting work, and the overall position of the cargo boom is adjusted through the auxiliary arm; the main arm and the auxiliary arm can stretch out and draw back, on one hand, the main telescopic arm and / or the auxiliary telescopic arm can be adjusted according to actual requirements, then the length of the cargo boom is adjusted to adapt to different working height and distance requirements, and better flexibility and a larger operation range are provided in different working environments.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a lifting arm used on an operating machinery. Background Art

[0002] Working machinery, such as cranes and hoists, are widely used in many fields such as construction, bridges, electricity, ports, etc., mainly for lifting and moving heavy objects. As the core component of working machinery, the performance of the crane arm directly affects the operating efficiency and safety of the machinery. Traditional crane arms are usually composed of a main arm and a jib, and the crane arm is extended and retracted by a hydraulic cylinder to adapt to different working needs and environments.

[0003] The existing crane arm design mostly adopts the structure of main arm and auxiliary arm, in which the auxiliary arm usually adopts a truss structure, which only has the function of auxiliary support and is mainly used to enhance the stability of the crane arm when bearing load. This design brings limitations in terms of operating range and lifting flexibility.

[0004] In addition, as engineering projects become more complex and diverse, existing crane arms are difficult to design to provide a wide operating range and high flexibility, especially when precise operations are required in space-constrained environments. This not only limits the application scope of the operating machinery, but also increases safety hazards during operation.

[0005] Furthermore, although the main arm and auxiliary arm of a traditional crane arm can be retracted when not in use, since the auxiliary arm only has an auxiliary support function, its extension and rotation capabilities are limited, resulting in the inability to achieve efficient adjustment and flexible operation when the operating range needs to be expanded. Summary of the invention

[0006] The object of the present invention is to provide a lifting arm for an operating machine with a larger operating range and better flexibility.

[0007] The lifting arm provided by the present invention for use on an operating machine comprises a main arm and a secondary arm; the main arm comprises a main base arm and a main telescopic arm, and the main telescopic arm can be retracted into the main base arm or extended out of the main base arm; the secondary arm is used for lifting heavy objects, the secondary arm can rotate relative to the main arm, the secondary arm comprises a secondary base arm and a secondary telescopic arm, and the secondary telescopic arm can be retracted into the secondary base arm or extended out of the secondary base arm.

[0008] In one embodiment of the above-mentioned lifting arm, the main telescopic arm includes multiple main section arms, and the main section arm of two adjacent main section arms far away from the main base arm can be extended or retracted to the main section arm close to the main base arm, and the main section arm farthest from the main base arm among the multiple main section arms is rotatably connected to the auxiliary base arm.

[0009] In one embodiment of the above-mentioned lifting arm, the auxiliary arm has a parallel position and an extended position along its rotation direction; when the auxiliary arm is in the parallel position, along the projection of the first direction, the main arm and the auxiliary arm are arranged side by side along the second direction; when the auxiliary arm is in the extended position, along the projection of the first direction, the main arm and the auxiliary arm are extended along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0010] In one embodiment of the above-mentioned lifting arm, the lifting arm includes an ear plate, a swing seat and a pin shaft; one of the ear plate and the swing seat is arranged on the main telescopic arm, and the other of the ear plate and the swing seat is arranged on the auxiliary base arm, the ear plate is formed with a slot and a first pin hole connected to the slot, the swing seat is formed with an insert block, the insert block is formed with a second pin hole, and the insert block is inserted in the slot; the pin shaft is penetrated through the first pin hole and the second pin hole, so that the auxiliary arm can rotate around the pin shaft.

[0011] In one embodiment of the above-mentioned lifting arm, the lifting arm includes a slewing reducer, and the slewing reducer is arranged on the main telescopic arm, and is used to drive the auxiliary arm to rotate around the pin shaft.

[0012] In one embodiment of the above-mentioned lifting arm, a slot is formed on the ear plate on a side away from the slot along the second direction, and a buckle is formed on the swing seat on a side away from the plug block along the second direction, and when the auxiliary arm is in the deployed position, the slot and the buckle are engaged with each other.

[0013] In one embodiment of the above-mentioned lifting arm, the lifting arm includes a latch cylinder, which is arranged on the ear plate, and the groove wall of the slot is formed with a first plug hole penetrating along the first direction, and the buckle is formed with a second plug hole penetrating along the first direction, and when the buckle is located in the slot, the telescopic rod of the latch cylinder extends out and passes through the first plug hole and the second plug hole.

[0014] In one embodiment of the above-mentioned lifting arm, the lifting arm includes a controller and a sensor, the controller is electrically connected to the sensor, the latch cylinder and the slewing reducer respectively, the controller is used to control the slewing reducer to drive the swing seat to switch between the parallel position and the deployed position; the sensor is arranged in the slot, for detecting the buckle, when it is detected that the buckle is located in the slot, the controller controls the latch cylinder to latch or pull out the pin.

[0015] In one embodiment of the above-mentioned lifting arm, a guide groove is formed on the periphery of the second plug-in hole, and the buckle is inserted into the second plug-in hole through the guide groove.

[0016] In one embodiment of the above-mentioned lifting arm, the lifting arm comprises an auxiliary luffing cylinder, and the auxiliary luffing cylinder is telescopically supported on the auxiliary base arm.

[0017] The beneficial effects of the present invention are:

[0018] The main boom can be used for support and the auxiliary boom can be used as the working boom for lifting work, so that the overall position of the boom can be adjusted with the auxiliary boom; both the main boom and the auxiliary boom can be telescopic. On the one hand, the main telescopic boom and / or the auxiliary telescopic boom can be adjusted according to actual needs, and then the length of the boom can be adjusted to adapt to different working heights and distance requirements, providing better flexibility and a larger operating range in different working environments; on the other hand, the main boom and the auxiliary boom can be retracted when not in use, reducing the space occupied by the boom and facilitating transportation and placement, which is particularly important for operations in space-constrained environments; at the same time, the auxiliary boom can rotate relative to the main boom, further improving flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a crane arm provided in an embodiment of the present application, wherein the auxiliary arm is in a parallel position, and the main telescopic arm and the auxiliary telescopic arm are both in a retracted state;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective;

[0021] Figure 3 for Figure 1 A structural diagram from another perspective;

[0022] Figure 4 A schematic diagram of the structure of a crane arm provided in another embodiment of the present application, wherein the auxiliary arm is in an extended position, and the main telescopic arm and the auxiliary telescopic arm are both in a retracted state;

[0023] Figure 5 for Figure 4 A schematic diagram of the structure from another perspective;

[0024] Figure 6 Still another embodiment of the present application provides a structural schematic diagram of a crane arm, wherein the auxiliary arm is in an unfolded position, and the main telescopic arm and the auxiliary telescopic arm are both in an extended state.

[0025] Reference numerals:

[0026] 100, crane arm; 1, main arm; 11, main base arm; 12, main telescopic arm; 121, main section arm; 2, auxiliary arm; 21, auxiliary base arm; 22, auxiliary telescopic arm; 221, auxiliary section arm; 3, main luffing cylinder; 31, cylinder barrel of main luffing cylinder; 32, telescopic rod of main luffing cylinder; 4, ear plate; 41, slot; 43, plate body; 44, rotating plate; 441, first plate; 442, second plate; 45, card slot; 45a, first plug hole ; 46, plug-in board; 461, third board; 462, fourth board; 5, swing seat; 51, plug-in block; 53, seat body; 54, connecting ear; 55, buckle; 55a, second plug-in hole; 55b, guide groove; 56, buckle ear; 6, pin shaft; 7, rotary reducer; 8, auxiliary variable-luffing oil cylinder; 81, cylinder barrel of auxiliary variable-luffing oil cylinder; 82, telescopic rod of auxiliary variable-luffing oil cylinder; 9, latch oil cylinder; 91, cylinder barrel of latch oil cylinder; 92, telescopic rod of latch oil cylinder;

[0027] Figure 1 R1 in is the first direction; Figure 2 R2 in is the second direction; Figure 1 R3 is the third direction; wherein the first direction, the second direction and the third direction are perpendicular to each other. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technical solutions. Obviously, the described embodiments are only part of the embodiments, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Reference Figures 1 to 6 The lifting arm for use on a working machine disclosed in this embodiment includes a main arm 1 and a secondary arm 2.

[0030] The main arm 1 includes a main base arm 11 and a main telescopic arm 12, and the main telescopic arm can be retracted into the main base arm or extended out of the main base arm; the auxiliary arm 2 is used for lifting heavy objects, and the auxiliary arm can rotate relative to the main arm. The auxiliary arm includes a secondary base arm 21 and a secondary telescopic arm 22, and the secondary telescopic arm can be retracted into the secondary base arm or extended out of the secondary base arm.

[0031] Therefore, the main arm 1 can be used for support, and the auxiliary arm 2 can be used as a working arm for lifting work, so that the overall position of the crane arm can be adjusted by using the auxiliary arm.

[0032] Both the main arm 1 and the auxiliary arm 2 can be telescopic. In this way, on the one hand, the main telescopic arm 12 and / or the auxiliary telescopic arm 22 can be adjusted according to actual needs, and then the length of the crane arm can be adjusted to adapt to different working heights and distance requirements, thereby providing better flexibility and a larger operating range in different working environments; on the other hand, the main arm and the auxiliary arm can be retracted when not in use to reduce the space occupied by the crane arm and facilitate transportation and placement, which is particularly important for operations in space-constrained environments.

[0033] The auxiliary arm 2 can rotate relative to the main arm 1, and the flexibility is further improved.

[0034] The working machine of this embodiment may be a crane or a hoist.

[0035] In one embodiment, the working machine includes a base and a turntable, the turntable is arranged on the base, the turntable can rotate along a rotation center, and the telescopic arm can be arranged on the turntable. The telescopic arm can rotate with the turntable to increase the working range of the working machine.

[0036] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The lifting arm comprises a main luffing cylinder 3, which is telescopically supported between the main base arm 11 and the turntable.

[0037] Exemplarily, the cylinder barrel 31 of the main luffing cylinder may be rotatably connected to the turntable, and the telescopic rod 32 of the main luffing cylinder may be rotatably connected to the main base arm 11 .

[0038] In this way, the angle between the main boom 1 and the turntable can be adjusted by extending and retracting the main luffing cylinder 3, thereby further improving the operating range and flexibility of the crane arm.

[0039] In one embodiment, please refer to Figure 6 The main telescopic arm 12 includes multiple main section arms 121. The main section arm farthest from the main base arm 11 among two adjacent main section arms can be extended or retracted to the main section arm close to the main base arm. The main section arm farthest from the main base arm among the multiple main section arms is rotatably connected to the auxiliary base arm 21.

[0040] Exemplarily, the main telescopic arm 12 may include a five-section main arm 121, wherein the main arm closest to the main base arm 11 among the five main arms can be retracted into the main base arm or extended out of the main base arm, the main arm farthest from the main base arm among the five main arms can be rotatably connected to the auxiliary base arm 21, and the main arm farthest from the main base arm among two adjacent main arms can be extended or retracted to the main arm close to the main base arm.

[0041] In this way, the plurality of main boom sections 121 can be retracted or extended in sequence to further increase the extension length of the boom and improve the operating range of the operating machine.

[0042] In one embodiment, please refer to Figure 6 The auxiliary telescopic arm 22 may include at least one auxiliary arm section 221, and the at least one auxiliary arm section may be telescopically arranged in the auxiliary base arm 21.

[0043] In this way, on the basis of adjusting the main boom 1, the operating range of the lifting arm 100 can be further improved by extending or retracting the auxiliary boom 221, which has strong flexibility.

[0044] In one embodiment, please refer to Figure 2 and Figure 5 The auxiliary arm 2 has a parallel position and an extended position along its rotation direction. When the auxiliary arm 2 is in the parallel position, along the projection of the first direction, the main arm 1 and the auxiliary arm 2 are arranged side by side along the second direction. When the auxiliary arm 2 is in the extended position, along the projection of the first direction, the main arm 1 and the auxiliary arm 2 are extended along the third direction.

[0045] It can be understood that, in the projection along the first direction, the main arm 1 and the auxiliary arm 2 are extended along the third direction, which means that in the projection along the first direction, the main arm 1 and the auxiliary arm 2 have the same extension direction, both extending to the third direction, and the main arm 1 is connected to one side of the auxiliary arm 2 along the third direction so that the main arm 1 and the auxiliary arm 2 are coaxially and collinearly arranged along the third direction.

[0046] When the boom is not working, the auxiliary arm 2 can be rotated to a parallel position so that the projected main arm 1 along the second direction and the auxiliary arm can be arranged side by side along the second direction, that is, the auxiliary arm can be folded and arranged side by side with the main arm; in this way, the occupied space can be reduced and transportation and placement can be facilitated.

[0047] When the boom is working, the auxiliary arm can be rotated to the unfolded position, so that the projected main arm along the first direction and the auxiliary arm can be extended along the third direction, that is, the auxiliary arm can be unfolded and the main arm can be extended; in this way, the extension length of the boom can be extended, the operating range is wider, and the flexibility is strong.

[0048] In one embodiment, please refer to Figures 1 to 3 The lifting arm includes an ear plate 4, a swing seat 5, a pin 6 and a rotary reducer 7. One of the ear plate and the swing seat is arranged on the main telescopic arm 12, and the other of the ear plate and the swing seat is arranged on the auxiliary base arm 21. The ear plate is formed with a slot 41 and a first pin hole connected to the slot. The swing seat is formed with an insert block 51, and the insert block is formed with a second pin hole. The insert block is inserted into the slot. The pin is inserted into the first pin hole and the second pin hole so that the auxiliary arm 2 can rotate around the pin.

[0049] Exemplarily, the swing seat 5 may be disposed on the auxiliary base arm 21 and rotatably connected thereto, and the ear plate 4 may be disposed on the main section arm farthest from the main base arm 11 among the plurality of main section arms 121 .

[0050] Specifically, the swing seat 5 includes a seat body 53 and a connecting ear 54. The seat body can be rotatably connected to the auxiliary base arm 21. The connecting ear is connected to one end of the seat body along the second direction. The other end of the connecting ear protrudes along the third direction away from the auxiliary base arm 21 and is inclined along the second direction away from the seat body. An insert block 51 is formed at one end of the connecting ear away from the seat body, and the insert block is formed with a second pin hole penetrating along the first direction.

[0051] The ear plate 4 includes a plate body 43 and a rotating plate 44. The plate body can be connected to the main section arm farthest from the main base arm 11 among the multiple main section arms 121. The rotating plate is arranged at one end of the plate body along the first direction. The rotating plate includes a first plate 441 and a second plate 442. The first plate and the second plate are spaced apart along the first direction to define a slot 41. The first plate and the second plate are both formed with a first pin hole passing through the first direction. The insert block 51 is inserted in the slot, and the pin shaft 6 passes through the second pin hole and the two first pin holes.

[0052] In this way, the auxiliary arm 2 can be supported by the swing seat 5, the pin 6 and the ear plate 4 to rotate around the pin, so that the auxiliary arm can be folded and unfolded for easy storage and transportation.

[0053] In one embodiment, please refer to Figures 1 to 3 The number of connecting ears 54, rotating plates 44 and pin shaft 6 can all be two, the two connecting ears are arranged at intervals on both sides of the seat body 53 along the first direction, the two rotating plates are arranged at intervals on both sides of the plate body 43 along the first direction, each plug block 51 is inserted into the corresponding slot 41, and each pin shaft is passed through the corresponding first pin hole and second pin hole.

[0054] In this way, the force and support of the auxiliary arm 2 can be enhanced, and the rotation stability is good.

[0055] In one embodiment, please refer to Figures 1 to 3 The lifting arm includes a slewing reducer 7, which is arranged on the main telescopic arm 12 and is used to drive the auxiliary arm 2 to rotate around the pin shaft 6.

[0056] Exemplarily, the slewing reducer 7 may be connected to the ear plate 4 of the main telescopic arm 12 to drive the auxiliary arm 2 to rotate around the pin shaft 6 .

[0057] In this way, a slewing reducer 7 is provided to drive the jib 2 to rotate around the pin shaft 6. On the one hand, the use of a slewing reducer can provide high torque output to ensure that the jib can rotate smoothly even under heavy load conditions; on the other hand, the slewing reducer has a higher reduction ratio, which makes it possible to accurately control the rotation of the jib and improve the accuracy of the operation; on another hand, compared with the related art that uses a hydraulic motor and a connecting rod mechanism to drive the jib to rotate, the embodiment of the present application uses a slewing reducer to drive the jib to rotate, which has a compact structure and occupies a small space.

[0058] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 The lifting arm includes an auxiliary luffing cylinder 8, which is telescopically supported on the auxiliary base arm 21.

[0059] Exemplarily, the cylinder barrel 81 of the auxiliary luffing cylinder can be rotatably set on the swing seat 5 on the auxiliary base arm 21, and the telescopic rod 82 of the auxiliary luffing cylinder can be rotatably set on the auxiliary base arm. Through the extension and retraction of the auxiliary luffing cylinder 8, the angle between the auxiliary arm 2 and the main arm 1 can be adjusted to achieve stepless adjustment.

[0060] In this way, not only can the operating range and flexibility of the crane arm be further improved, but the angle can also be adjusted accurately.

[0061] In one embodiment, the first direction may be the extending direction of the rotation axis of the pin shaft 6 , and the third direction may be the telescopic direction of the main arm 1 or the telescopic direction of the auxiliary arm 2 .

[0062] In one embodiment, please refer to Figure 3 and Figure 5 A slot 45 is formed on the ear plate 4 at one side away from the slot 41 along the second direction, and a buckle 55 is formed on the swing seat 5 at one side away from the plug block 51 along the second direction. When the auxiliary arm 2 is in the unfolded position, the slot and the buckle are engaged with each other.

[0063] Exemplarily, the ear plate 4 includes a plug-in plate 46, which can be connected to one end of the plate body 43 away from the rotating plate 44 along the second direction. The plug-in plate includes a third plate 461 and a fourth plate 462, and the third plate and the fourth plate are spaced apart along the first direction to define a card slot 45.

[0064] The swing seat 5 includes a snap-fit ​​ear 56, one end of which can be connected to one end of the seat body 53 away from the connecting ear 54 along the second direction, and the other end of the snap-fit ​​ear extends away from the seat body along the third direction and is inclined along the second direction away from the seat body, so that the projection shape of the swing seat 5 along the first direction is roughly in the shape of a "〔", and a buckle 55 is formed at one end of the snap-fit ​​ear away from the seat body along the third direction.

[0065] In this way, when the jib 2 is in the unfolded position, the connecting ear 54 and the buckling ear 56 of the swing seat 5 can avoid the ear plate 4, so that the buckle 55 can be inserted into the slot 45, reducing the rotation of the jib 2 when the crane arm is working, and improving the working stability.

[0066] In one embodiment, please refer to Figure 3 and Figure 5The number of the plug-in boards 46 and the snap-fit ​​ears 56 can be two each. The two plug-in boards can be spaced apart on both sides of the plate body 43 along the first direction. The two snap-fit ​​ears can be spaced apart on both sides of the seat body 53 along the first direction. Each buckle 55 can be plugged into the corresponding slot 45.

[0067] In this way, the force and support of the auxiliary arm 2 during operation can be enhanced, and the working stability is good.

[0068] In one embodiment, please refer to Figure 1 , Figure 3 and Figure 5 The lifting arm includes a latch cylinder 9, which is arranged on the ear plate 4. The groove wall of the slot 45 is formed with a first plug hole 45a penetrating along the first direction, and the buckle 55 is formed with a second plug hole 55a penetrating along the first direction. When the buckle is located in the slot, the telescopic rod 92 of the latch cylinder extends out and penetrates the first plug hole and the second plug hole.

[0069] Exemplarily, the cylinder barrel 91 of the latch cylinder can be disposed in the middle of the two plug-in plates 46 along the first direction. The third plate 461 and the fourth plate 462 are both formed with a first plug-in hole 45a penetrating along the first direction, and the buckle 55 is formed with a second plug-in hole 55a penetrating along the first direction.

[0070] In this way, when the buckle 55 is located in the slot 45, the telescopic rod 92 of the latch cylinder can extend out and pass through the first plug hole 45a and the second plug hole 55a to lock the jib 2; further improving the stability of the jib in the deployed position, reducing the rotation of the jib when the crane arm is working, and further improving the working stability.

[0071] In one embodiment, please refer to Figure 2 A guide groove 55b is formed on the periphery of the second plug-in hole 55a, and the buckle 55 is inserted into the second plug-in hole through the guide groove.

[0072] Exemplarily, a circular guide groove 55b is formed on the periphery of the second plugging hole 55a.

[0073] In this way, since the diameter of the guide groove 55b is larger than the diameter of the second plug-in hole 55a, when the buckle 55 and the slot 45 are not properly plugged into each other so that the telescopic rod 92 of the latch cylinder is not aligned with the second pin hole, the telescopic rod of the latch cylinder can still be inserted into the second plug-in hole through the guidance of the guide groove; the guide groove helps to guide the telescopic rod of the latch cylinder to accurately correspond to the second plug-in hole, ensuring that the telescopic rod can be smoothly inserted into the pin hole, making the installation process easier and improving work efficiency.

[0074] In one embodiment, the lifting arm includes a controller and a sensor. The controller is electrically connected to the sensor, the latch cylinder 9 and the rotary reducer 7 respectively. The controller is used to control the rotary reducer to drive the swing seat 5 to switch between the parallel position and the unfolded position. The sensor is arranged in the slot 45 to detect whether the buckle 55 is inserted into the slot 45. When it is detected that the buckle is in the slot, the controller controls the latch cylinder to latch or pull out the pin.

[0075] In this way, when the boom is required to lift, the sensor can be used to detect whether the buckle 55 is inserted in the slot 45. If the buckle is not inserted in the slot, the sensor will send a first instruction to the controller. After receiving the first instruction, the controller will send a second instruction to the rotary reducer 7. The rotary reducer receives the second instruction to drive the auxiliary arm 2 to rotate around the pin shaft 6 from the parallel position to the unfolded position. After the sensor detects the buckle in the slot, the controller will send a third instruction to the controller. After receiving the third instruction, the controller will send a fourth instruction to the latch cylinder 9. After receiving the fourth instruction, the latch cylinder will drive its telescopic rod to be inserted into the first plug hole 45a and the second plug hole 55a to lock the auxiliary arm 2.

[0076] When the boom needs to be folded for transportation, the controller sends the fifth instruction to the latch cylinder 9; after receiving the fifth instruction, the latch cylinder will drive its telescopic rod to retract, and then the controller sends the sixth instruction to the slewing reducer 7; after receiving the sixth instruction, the slewing reducer will drive the auxiliary arm 2 to rotate from the unfolded position to the parallel position.

[0077] By arranging sensors and controllers, the switching between the parallel position and the unfolded position of the auxiliary arm 2 and the automatic locking of the auxiliary arm 2 by the latch cylinder 9 are automatically realized, and the degree of automation is high.

[0078] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lifting arm for use on an operating machine, characterized in that: It includes the main boom and jib; The main arm includes a main base arm and a main telescopic arm, and the main telescopic arm can be retracted into the main base arm or extended out of the main base arm; The auxiliary arm is used for hoisting heavy objects. The auxiliary arm can rotate relative to the main arm. The auxiliary arm includes a secondary base arm and a secondary telescopic arm. The secondary telescopic arm can be retracted into the secondary base arm or extended outside the secondary base arm.

2. The lifting arm for use on a working machine according to claim 1, characterized in that: The main telescopic arm comprises a plurality of main section arms, wherein the main section arm of two adjacent main section arms which is far from the main base arm can be extended or retracted to the main section arm which is close to the main base arm, and the main section arm which is farthest from the main base arm among the plurality of main section arms is rotatably connected to the auxiliary base arm.

3. The lifting arm for use on a working machine according to claim 1, characterized in that: The auxiliary arm has a parallel position and an extended position along its rotation direction; when the auxiliary arm is in the parallel position, along the projection of the first direction, the main arm and the auxiliary arm are arranged side by side along the second direction; when the auxiliary arm is in the extended position, along the projection of the first direction, the main arm and the auxiliary arm are extended along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

4. The lifting arm for use on a working machine as claimed in claim 3, characterized in that: The lifting arm comprises a lug plate, a swing seat and a pin; One of the ear plate and the swing seat is arranged on the main telescopic arm, and the other of the ear plate and the swing seat is arranged on the auxiliary base arm. The ear plate is formed with a slot and a first pin hole connected to the slot, and an insert block is formed in the swing seat. The insert block is formed with a second pin hole, and the insert block is inserted in the slot; a pin shaft is passed through the first pin hole and the second pin hole so that the auxiliary arm can rotate around the pin shaft.

5. The lifting arm for use on a working machine according to claim 4, characterized in that: The lifting arm comprises a slewing reducer, which is arranged on the main telescopic arm and is used to drive the auxiliary arm to rotate around the pin shaft.

6. The lifting arm for use on a working machine according to claim 5, characterized in that: A slot is formed on the ear plate at one side away from the slot along the second direction, and a buckle is formed on the swing seat at one side away from the plug block along the second direction. When the auxiliary arm is in the unfolded position, the slot is engaged with the buckle.

7. The lifting arm for use on a working machine according to claim 6, characterized in that: The lifting arm includes a latch cylinder, which is arranged on the ear plate. The slot wall of the slot is formed with a first plugging hole penetrating along the first direction, and the buckle is formed with a second plugging hole penetrating along the first direction. When the buckle is located in the slot, the telescopic rod of the latch cylinder extends out and passes through the first plugging hole and the second plugging hole.

8. The lifting arm for use on a working machine according to claim 7, characterized in that: The lifting arm includes a controller and a sensor, and the controller is electrically connected to the sensor, the latch cylinder and the slewing reducer respectively. The controller is used to control the slewing reducer to drive the swing seat to switch between the parallel position and the deployed position; the sensor is arranged in the slot, and is used to detect the buckle. When it is detected that the buckle is located in the slot, the controller controls the latch cylinder to latch or pull out the pin.

9. The lifting arm for use on a working machine according to claim 7, characterized in that: A guide groove is formed on the periphery of the second plugging hole, and the buckle is inserted into the second plugging hole through the guide groove.

10. The lifting arm for use on a working machine according to claim 1, characterized in that: The lifting arm comprises an auxiliary luffing oil cylinder, which is telescopically supported on the auxiliary base arm.

Images