Counter jib turning device and crane

Abstract

The present disclosure specifically relates to a vice-arm overturning device and a crane, the vice-arm overturning device being used for overturning a vice-arm arranged on one side of a main arm, comprising a first support, a second support, a third support and a rotating shaft, the first support being fixedly arranged on one side of the main arm close to the vice-arm, the second support being fixedly arranged on one side of the vice-arm close to the main arm, the third support being rotatably connected to the first support and detachably connected to the second support, the rotating shaft being arranged through the first support and the third support, wherein the axis direction of the rotating shaft is at an angle with the length direction of the main arm and is not parallel to each other, so that the vice-arm is overturned from the side of the main arm to the side below the main arm, and the arm head of the overturned vice-arm is close to the arm head of the main arm. The present disclosure can reduce the width requirement of the working site caused by the vice-arm hanging.

Description

Technical Field

[0001] This disclosure relates to the field of construction machinery, and in particular to a boom tilting device and a crane. Background Technology

[0002] A jib is a boom-like structural component that increases the lifting height and reach of a crane. Normally, the lifting height and reach of a crane are fixed after the design is completed. However, in actual use of lifting equipment, it may be necessary to achieve a lifting height and reach exceeding the product's performance capabilities. To increase the crane's lifting height and reach, a jib is installed on one side of the main boom. Jibs are often truss structures.

[0003] In some related technologies, the auxiliary boom is attached to the side of the main boom while the vehicle is in motion. During operation, the auxiliary boom needs to be rotated and pulled out in the horizontal plane to align with the main boom, thus achieving the attachment of the auxiliary boom. This method of attaching the auxiliary boom requires a wide open space and cannot meet the requirements for installing the auxiliary boom in narrow spaces. Summary of the Invention

[0004] In view of this, embodiments of the present disclosure provide a boom tilting device and a crane that can reduce the width requirements of the work site for boom attachment.

[0005] In one aspect of this disclosure, a secondary boom flipping device is provided for flipping a secondary boom disposed on one side of the main boom, comprising: The first bracket is fixedly installed on the side of the main arm near the auxiliary arm; The second bracket is fixedly installed on the side of the auxiliary arm near the main arm; The third bracket is rotatably connected to the first bracket and detachably connected to the second bracket; and A rotating shaft passes through the first bracket and the third bracket; The axis of the rotation shaft is at an angle to the length direction of the main arm, but not parallel to it, so that the auxiliary arm flips from the side of the main arm to the side below the main arm and the head of the flipped auxiliary arm is close to the head of the main arm.

[0006] In some embodiments, the auxiliary arm tilting device further includes: A drive cylinder includes a cylinder body and a piston rod, the cylinder body being rotatably connected to a first bracket and the piston rod being rotatably connected to a third bracket. The drive cylinder is configured to drive the third bracket to flip by extending and retracting the piston rod, such that the auxiliary arm flips from the side of the main arm to below the side of the main arm and flips the auxiliary arm from below the side of the main arm to the side of the main arm.

[0007] In some embodiments, the first bracket includes two side plates spaced apart along the length of the main arm, the third bracket is disposed between the two side plates, and the rotation shaft passes through the third bracket and the two side plates.

[0008] In some embodiments, the third support includes a first frame and a second frame spaced apart along the length of the main arm, the first frame being attached to one of the two side plates, and the auxiliary arm tilting device further includes: A drive cylinder includes a cylinder body and a piston rod. The cylinder body is rotatably connected to the first bracket, and the piston rod is disposed between and rotatably connected to the first and second brackets. The drive cylinder is configured to drive the third bracket to rotate by extending and retracting the piston rod, thereby causing the auxiliary arm to flip from the side of the main arm to the underside of the main arm and from the underside of the main arm to the side of the main arm.

[0009] In some embodiments, the auxiliary arm tilting device further includes: A first limiting member is detachably inserted through the second bracket and the third bracket to limit the relative movement of the second bracket and the third bracket at least in the length direction of the main arm.

[0010] In some embodiments, the third support further includes: A first limiting member bracket, fixedly connected to the third bracket and detachably connected to the first limiting member, is configured to accommodate the first limiting member detached from the second bracket and the third bracket.

[0011] In some embodiments, the third support further includes: A first limiting member bracket, fixedly connected to the third bracket and detachably connected to the first limiting member, is configured to accommodate the first limiting member detached from the second bracket and the third bracket; and A locking element is detachably connected to the first limiting element to lock the first limiting element contained in the first limiting element bracket, and to lock the first limiting element passing through the second bracket and the third bracket.

[0012] In some embodiments, the main arm is extendable and retractable along its length, and the auxiliary arm tilting device further includes: A second limiting member is disposed on the second bracket and detachably inserted through the third bracket. The second limiting member is configured to disengage from the third bracket when the second bracket moves in the extension direction of the main arm and to insert into the third bracket when the second bracket moves in the shortening direction of the main arm.

[0013] In some embodiments, the second limiting member is rod-shaped, including a rod body and a collar disposed radially outward of the rod body, and the third bracket includes a limiting hole, the rod body being configured to pass through the limiting hole when the second bracket moves in the shortening direction of the main arm, the third bracket including: A first limiting portion, protruding outward from the limiting hole in the circumferential direction, is configured to limit the collar in the shortening direction of the main arm; and The second limiting portion, which is spaced apart from the first limiting portion in the extension direction of the main arm, is configured to limit the collar radially outward.

[0014] In some embodiments, the collar is movable along the length of the rod, and the second bracket further includes: The second limiting member bracket, the second limiting member being disposed on the second limiting member bracket; and An elastic element is disposed between the collar and the second limiting member bracket.

[0015] In some embodiments, the second support further includes: The second limiting member bracket, the second limiting member is disposed on the second limiting member bracket; The second limiting member also includes: An expansion member is radially inserted through the second limiting member and through the bracket of the second limiting member. The expansion member is configured to expand after being inserted into the second limiting member in order to be fixedly connected to the second limiting member.

[0016] In another aspect of this disclosure, a crane is provided, including the aforementioned boom tilting device.

[0017] According to an embodiment of this disclosure, the boom tilting device includes a first bracket, a second bracket, a third bracket, and a rotating shaft. The axis of the rotating shaft forms an angle with the length direction of the main boom, rather than being parallel to it, so that the boom can be tilted from the side of the main boom to the lower side of the main boom, and the head of the tilted boom is close to the head of the main boom, so as to connect the head of the boom and the head of the main boom. In this way, the connection between the boom and the main boom can be completed without rotating the boom in the horizontal direction, thereby reducing the width requirements of the work site for boom attachment, and the installation of the boom can be completed in narrow and long spaces. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0019] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a structural schematic diagram of the auxiliary boom located on the side of the main boom according to some embodiments of the crane disclosed herein; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the structure of the auxiliary boom located below the main boom according to some embodiments of the crane disclosed herein; Figure 4 yes Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a structural schematic diagram of the first bracket of the auxiliary arm tilting device according to the present disclosure; Figure 6 This is an exploded view of the third support of the auxiliary arm tilting device according to the present disclosure; Figure 7 This is a structural schematic diagram of the second bracket of the auxiliary arm tilting device according to the present disclosure; Figure 8 This is a schematic diagram showing the connection relationship between the second and third supports of the auxiliary boom tilting device according to this disclosure.

[0020] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components.

[0021] Figure label: 1. Main arm; 2. Accessory arm; 31. First bracket; 311. Side plate; 312. Cylinder block fixing hole; 313. Rotary shaft fixing hole; 32. Second bracket; 321. Second limiting bracket; 322. Elastic element; 323. Second positioning hole; 33. Third bracket; 331. First frame; 332. Second frame; 333. First limiting bracket; 334. Limiting hole; 3351. First limiting part; 3352. Second limiting part; 336. First positioning hole; 337. First positioning hole; 34. Rotation axis; 35. Drive cylinder; 351. Cylinder body; 352. Piston rod; 36. First limiting component; 361. Locking component; 37. Second limiting component; 371. Rod body; 372. Collar; 373. Expansion component. Detailed Implementation

[0022] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0023] When using terms like "includes" or "contains," to describe an element as "including" or "containing" one or more elements, it should be understood that the elements listed after the word are components of the element preceding the word, but this does not preclude the possibility that the element preceding the word may also contain other elements. Furthermore, this statement specifically covers situations where the element preceding the word is entirely composed of or specifically realized by all the elements listed after the word.

[0024] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0025] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0026] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0028] A jib is a boom-like structural component that increases the lifting height and reach of a crane. Normally, the lifting height and reach of a crane are fixed after the design is completed. However, in actual use of lifting equipment, it may be necessary to achieve a lifting height and reach exceeding the product's performance capabilities. To increase the crane's lifting height and reach, a jib is installed on one side of the main boom. Jibs are often truss structures.

[0029] In some related technologies, the auxiliary boom is attached to the side of the main boom while the vehicle is in motion. During operation, the auxiliary boom needs to be rotated and pulled out in the horizontal plane to align with the main boom, thus achieving the attachment of the auxiliary boom. This method of attaching the auxiliary boom requires a wide open space and cannot meet the requirements for installing the auxiliary boom in narrow spaces.

[0030] In view of this, embodiments of the present disclosure provide a boom tilting device and a crane that can reduce the width requirements of the work site for boom attachment.

[0031] Figure 1 This is a structural schematic diagram of the auxiliary boom located on the side of the main boom according to some embodiments of the crane disclosed herein. Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle. Figure 3 This is a schematic diagram of the structure of a crane according to some embodiments of the present disclosure, in which the auxiliary boom is located below the main boom. Figure 4 yes Figure 3 A magnified view of a section at point B.

[0032] refer to Figures 1-4 In one aspect of this disclosure, a secondary boom flipping device is provided. The secondary boom flipping device is used to flip a secondary boom 2 disposed on one side of a main boom 1, and includes a first support 31, a second support 32, a third support 33, and a rotating shaft 34. The first support 31 is fixedly disposed on the side of the main boom 1 near the secondary boom 2, the second support 32 is fixedly disposed on the side of the secondary boom 2 near the main boom 1, the third support 33 is rotatably connected to the first support 31 and detachably connected to the second support 32, and the rotating shaft 34 passes through the first support 31 and the third support 33. The axial direction of the rotating shaft 34 forms an angle with the length direction of the main boom 1 and is not parallel to it, so that the secondary boom 2 flips from the side of the main boom 1 to the lower side of the main boom 1, with the tip of the flipped secondary boom 2 close to the tip of the main boom 1.

[0033] The cross-section of the main boom 1 can be approximately rectangular, and the first support 31 is disposed on one side of the main boom 1. The first support 31 and the main boom 1 can be fixed together by reinforcing ribs.

[0034] The axial direction of the rotation shaft 34 is at an angle to the length direction of the main arm 1 and is not parallel to it. For example, the axial direction of the rotation shaft 34 may be in the same plane as the length direction of the main arm 1, but not parallel to it, or the axial direction of the rotation shaft 34 may be in a different plane from the length direction of the main arm 1.

[0035] It should be understood that after the auxiliary boom 2 flips downward from the side of the main boom 1, the boom heads of the auxiliary boom 2 and the main boom 1 should be close to each other so that the main boom 1 and the auxiliary boom 2 can be connected. When the auxiliary boom 2 is set on the side of the main boom 1 (which can be called the retraction of the auxiliary boom 2), the boom heads of the auxiliary boom 2 and the main boom 1 are both far away from the luffing hinge point of the main boom 1.

[0036] The auxiliary boom 2 can be set on the side of the main boom 1 when the vehicle is in motion, and can be set and then tilted when in operation.

[0037] The auxiliary arm 2 flipping from the side of the main arm 1 to below the side of the main arm 1 means that the horizontal projections of the main arm 1 and the auxiliary arm 2 only partially overlap. Figure 1 In the middle, the distance between the secondary arm 2 and the main arm 1 gradually increases from the arm head to the arm tail.

[0038] According to the embodiments of this disclosure, the auxiliary boom tilting device includes a first bracket 31, a second bracket 32, a third bracket 33, and a rotating shaft 34. The axis of the rotating shaft 34 forms an angle with the length direction of the main boom 1, but is not parallel to it, allowing the auxiliary boom 2 to tilt from the side of the main boom 1 to below the side of the main boom 1, with the tilted auxiliary boom 2's head close to the head of the main boom 1, thus connecting the head of the auxiliary boom 2 and the head of the main boom 1. This eliminates the need for the auxiliary boom 2 to rotate horizontally to complete the connection between the auxiliary boom 2 and the main boom 1, thereby reducing the width requirements of the work area for auxiliary boom attachment. The auxiliary boom 2 can be installed even in narrow, elongated areas. Compared to the method of placing the auxiliary boom 2 directly below the main boom 1 while the vehicle is in motion, the embodiment of this disclosure has a lower height while in motion, resulting in better vehicle passability. Compared to the method of tilting the auxiliary boom 2 directly below the main boom 1 before installation, the embodiment of this disclosure allows for installation even when there is insufficient space directly below the main boom 1, since the tilted auxiliary boom 2 is located below the side of the main boom 1.

[0039] Figure 5 This is a structural schematic diagram of the first bracket of the auxiliary arm tilting device according to the present disclosure. Figure 6 This is an exploded schematic diagram of the third support of the auxiliary arm tilting device according to this disclosure.

[0040] refer to Figure 2 and Figures 4-6In some embodiments, the auxiliary boom tilting device further includes a drive cylinder 35, which includes a cylinder body 351 and a piston rod 352. The cylinder body 351 is rotatably connected to a first support 31, and the piston rod 352 is rotatably connected to a third support 33. The drive cylinder 35 is configured to drive the third support 33 to tilt by extending and retracting the piston rod 352, so that the auxiliary boom 2 tilts from the side of the main boom 1 to the underside of the main boom 1 and from the underside of the main boom 1 to the side of the main boom 1.

[0041] like Figure 5 As shown, the first bracket 31 has a cylinder fixing hole 312. The cylinder 351 is mounted on the first bracket 31 through the cylinder fixing hole 312 and can rotate around the axis of the cylinder fixing hole 312. Figure 6 As shown, the third bracket 33 has a piston rod fixing hole 337. The piston rod 352 is mounted on the third bracket 33 through the piston rod fixing hole 337 and can rotate around the axis of the piston rod fixing hole 337.

[0042] When the piston rod 352 extends or retracts, the third bracket 33 rotates around the axis of the rotation shaft 34. Therefore, the angular position between the cylinder body 351 and the first bracket 31 will change, and the angular position between the piston rod 352 and the third bracket 33 will also change. Through the rotatable connection between the cylinder body 351 and the first bracket 31, and the rotatable connection between the piston rod 352 and the third bracket 33, the drive cylinder 35 can drive the third bracket 33 to flip, thereby realizing the flipping of the auxiliary arm 2 from the side of the main arm 1 to the lower side of the main arm 1, and from the lower side of the main arm 1 to the side of the main arm 1.

[0043] like Figure 5 As shown, the first bracket 31 may also be provided with a rotating shaft fixing hole 313 for mounting the rotating shaft 34.

[0044] refer to Figure 2 , Figure 4 and Figure 5 In some embodiments, the first support 31 includes two side plates 311 spaced apart along the length of the main arm 1, the third support 33 is disposed between the two side plates 311, and the rotating shaft 34 passes through the third support 33 and the two side plates 311.

[0045] The two side plates 311 can be approximately perpendicular to the sides of the main arm 1, and reinforcing ribs can be provided between the two side plates 311 and the main arm 1.

[0046] The third support 33 is positioned between the two side plates 311 so that the two side plates 311 can protect the third support 33 and make the structure of the auxiliary boom tilting device more compact.

[0047] refer to Figure 2 , Figures 4-6 In some embodiments, the third support 33 includes a first frame 331 and a second frame 332 spaced apart along the length of the main arm 1. The first frame 331 is attached to one of the two side plates 311. The auxiliary arm tilting device also includes a drive cylinder 35, which includes a cylinder body 351 and a piston rod 352. The cylinder body 351 is rotatably connected to the first support 31, and the piston rod 352 is disposed between the first frame 331 and the second frame 332 and rotatably connected to the first frame 331 and the second frame 332. The drive cylinder 35 is configured to drive the third support 33 to rotate by extending and retracting the piston rod 352, so that the auxiliary arm 2 is tilted from the side of the main arm 1 to the underside of the main arm 1 and from the underside of the main arm 1 to the side of the main arm 1.

[0048] exist Figure 6 In the middle, the first frame 331 and the second frame 332 are roughly plate-shaped, and the first frame 331 and the second frame 332 can be connected by a connecting plate.

[0049] In this embodiment, the piston rod 352 is disposed between the first frame 331 and the second frame 332, so that the first frame 331 and the second frame 332 can protect the piston rod 352, and the first frame 331 is attached to one of the two side plates 311, which can make high space utilization.

[0050] Figure 7 This is a structural schematic diagram of the second bracket of the auxiliary boom tilting device according to the present disclosure. Figure 8 This is a schematic diagram showing the connection relationship between the second and third supports of the auxiliary boom tilting device according to this disclosure.

[0051] refer to Figures 6-8 In some embodiments, the auxiliary arm tilting device further includes a first limiting member 36, which is detachably inserted through the second support 32 and the third support 33 to limit the relative movement of the second support 32 and the third support 33 at least in the length direction of the main arm 1.

[0052] like Figure 6 and Figure 7 As shown, in order to cooperate with the first limiting member 36, the third bracket 33 can be provided with a pair of first positioning holes 336, and the second bracket 32 ​​can be provided with a second positioning hole 323.

[0053] In this embodiment, the first limiting member 36 is detachably inserted through the second bracket 32 ​​and the third bracket 33 to limit the relative movement of the second bracket 32 ​​and the third bracket 33 at least in the length direction of the main arm 1, and can limit the relative movement of the main arm 1 and the auxiliary arm 2 without disengaging them.

[0054] like Figure 7 and Figure 8 As shown, the first limiting member 36 can be a pin.

[0055] refer to Figure 6 In some embodiments, the third bracket 33 further includes a first limiting member bracket 333, which is fixedly connected to the third bracket 33 and detachably connected to the first limiting member 36, and is configured to accommodate the first limiting member 36 detached from the second bracket 32 ​​and the third bracket 33.

[0056] The first limiting member 36, which has been removed, can be properly placed through the first limiting member bracket 333.

[0057] When the first limiting member 36 is a pin, the first limiting member bracket 333 can be generally cylindrical so that the first limiting member 36 can be inserted.

[0058] refer to Figure 7 In some embodiments, the third support 33 further includes a first limiting member support 333 and a locking member 361. The first limiting member support 333 is fixedly connected to the third support 33 and detachably connected to the first limiting member 36, and is configured to accommodate the first limiting member removed from the second support 32 and the third support 33. The locking member 361 is detachably connected to the first limiting member 36 to lock the first limiting member 36 accommodated by the first limiting member support 333 and to lock the first limiting member 36 passing through the second support 32 and the third support 33.

[0059] By setting the locking member 361, the first limiting member 36 can be locked when the first limiting member 36 is inserted into the first limiting member bracket 333 and when the second bracket 32 ​​and the third bracket 33 are inserted, so as to form a stable connection.

[0060] exist Figure 7 and Figure 8 In the middle, the locking member 361 can be a clip, and the second bracket 32, the third bracket 33 and the first limiting member 36 are all provided with holes for the locking member 361 to pass through.

[0061] refer to Figure 7 and Figure 8 In some embodiments, the main arm 1 is extendable and retractable along its length, and the auxiliary arm tilting device further includes a second limiting member 37. The second limiting member 37 is disposed on the second bracket 32 ​​and detachably inserted through the third bracket 33. The second limiting member 37 is configured to disengage from the third bracket 33 when the second bracket 32 ​​moves in the extension direction of the main arm 1, and to insert into the third bracket 33 when the second bracket 32 ​​moves in the retraction direction of the main arm 1.

[0062] Since the main arm 1 extends after being connected to the auxiliary arm 2, the second limiting member 37 is set on the second bracket 32. When the main arm 1 extends, it will drive the auxiliary arm 2 and the second bracket 32 ​​on it to move together, while the third bracket 33 does not move. This will cause the second limiting member 37 to move away from the third bracket 33 and disengage from the third bracket 33.

[0063] When the auxiliary arm 2 is detached from the main arm 1, the second limiting member 37 will not limit the auxiliary arm 2. However, when the auxiliary arm 2 is not detached from the main arm 1 (including when the auxiliary arm 2 is retracted to the side of the main arm 1 and when the auxiliary arm 2 has completed its flip), the second limiting member 37 can limit the auxiliary arm 2. This allows the auxiliary arm 2 to be limited only when necessary, and it can be automatically limited or released with the movement of the main arm 1, which helps to improve the convenience of unfolding the auxiliary arm 2.

[0064] The second limiting member 37 can be, for example, a pin, and can be positioned approximately parallel to the extension direction of the main arm 1.

[0065] refer to Figures 6-8 In some embodiments, the second limiting member 37 is rod-shaped, including a rod body 371 and a collar 372 disposed radially outside the rod body 371, such that the second limiting member 37 can be generally in the form of a stepped shaft. The third support 33 includes a limiting hole 334, and the rod body 371 is configured to pass through the limiting hole 334 when the second support 32 moves in the shortening direction of the main arm 1. The axis of the limiting hole 334 can be generally parallel to the shortening direction of the main arm 1.

[0066] The third support 33 includes a first limiting part 3351 and a second limiting part 3352. The first limiting part 3351 is protruding outward from the limiting hole 334 and is configured to limit the collar 372 in the shortening direction of the main arm 1. Figure 6 and Figure 8 As shown, the end face of the first limiting part 3351 that contacts the collar 372 can have a shape that matches the collar 372, thereby limiting the collar 372 and allowing the rod 371 to pass smoothly into the limiting hole 334.

[0067] The second limiting part 3352 is provided at a distance from the first limiting part 3351 in the extension direction of the main arm 1, and is configured to limit the collar 372 on the radially outer side of the collar 372. This limits the vertical position of the collar 372.

[0068] The end of the rod 371 near the third bracket 33 may have a chamfer, making it easier for the rod 371 to be inserted into the limiting hole 334.

[0069] In this embodiment, the first limiting part 3351 can limit the horizontal position of the collar 372, and the second limiting part 3352 can limit the vertical position of the collar 372. The collar 372 can limit the position of the rod 371, so that the rod 371 can smoothly pass into the limiting hole 334.

[0070] refer to Figure 7 and Figure 8 In some embodiments, the collar 372 is movable along the length of the rod 371, and the second bracket 32 ​​further includes a second limiting member bracket 321 and an elastic member 322. The second limiting member 37 is disposed on the second limiting member bracket 321, and the elastic member 322 is disposed between the collar 372 and the second limiting member bracket 321.

[0071] exist Figure 7 In the middle, the elastic element 322 is a spring sleeved on the rod 371.

[0072] In this embodiment, the elastic element 322 is disposed between the collar 372 and the second limiting member bracket 321. When the rod 371 excessively penetrates the limiting hole 334, the first limiting part 3351 can limit the collar 372, thereby compressing the elastic element 322. The elastic element 322 can apply an outward popping force to the second limiting member bracket 321, so that the second limiting member 37 disposed thereon returns to the predetermined position.

[0073] refer to Figure 8 In some embodiments, the second bracket 32 ​​further includes a second limiting member bracket 321, and the second limiting member 37 is disposed on the second limiting member bracket 321. The second limiting member 37 also includes an expansion member 373, which passes radially through the second limiting member 37 and through the second limiting member bracket 321. The expansion member 373 is configured to expand after passing through the second limiting member 37 to be fixedly connected to the second limiting member 37.

[0074] The expansion member 373, which expands after being inserted into the second limiting member 37, can securely connect the second limiting member 37 to the second limiting member bracket 321.

[0075] exist Figure 8 In this context, the expansion component 373 can be an expansion pin.

[0076] The working process of some embodiments in this disclosure will be described below.

[0077] In driving mode, the piston rod 352 of the drive cylinder 35 retracts, and the auxiliary arm 2 is side-mounted on one side of the main arm 1. When using the auxiliary arm 2, the piston rod 352 extends, and the third bracket 33 drives the auxiliary arm 2 to rotate around the rotation axis 34. When the piston rod 352 is fully extended, the auxiliary arm 2 rotates to the side and below the main arm 1. The first limiting member 36 connecting the auxiliary arm 2 and the third bracket 33 is removed. At this time, there is still a second limiting member 37 connecting the auxiliary arm 2 and the third bracket 33. Extend the main arm 1, drive the auxiliary arm 2 to move so that the second limiting member 37 is disconnected from the third bracket 33, and then the subsequent mounting steps can be performed.

[0078] In another aspect of this disclosure, a crane is provided, including the aforementioned boom tilting device.

[0079] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0080] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A secondary boom tilting device, characterized in that, For flipping the auxiliary arm (2) located on one side of the main arm (1), including: The first bracket (31) is fixedly installed on the side of the main arm (1) near the auxiliary arm (2); The second bracket (32) is fixedly installed on the side of the auxiliary arm (2) near the main arm (1); The third bracket (33) is rotatably connected to the first bracket (31) and detachably connected to the second bracket (32); and A rotating shaft (34) passes through the first bracket (31) and the third bracket (33). The axis of the rotating shaft (34) is at an angle to the length direction of the main arm (1) and is not parallel to each other, so that the auxiliary arm (2) is flipped from the side of the main arm (1) to the side below the main arm (1) and the head of the flipped auxiliary arm (2) is close to the head of the main arm (1).

2. The auxiliary arm tilting device according to claim 1, characterized in that, Also includes: A drive cylinder (35) includes a cylinder body (351) and a piston rod (352), the cylinder body (351) being rotatably connected to the first bracket (31), and the piston rod (352) being rotatably connected to the third bracket (33). The drive cylinder (35) is configured to drive the third bracket (33) to flip by extending and retracting the piston rod (352) so that the auxiliary arm (2) flips from the side of the main arm (1) to the underside of the main arm (1) and flips from the underside of the main arm (1) to the side of the main arm (1).

3. The auxiliary arm tilting device according to claim 1, characterized in that, The first bracket (31) includes two side plates (311) spaced apart along the length of the main arm (1), the third bracket (33) is disposed between the two side plates (311), and the rotating shaft (34) passes through the third bracket (33) and the two side plates (311).

4. The auxiliary arm tilting device according to claim 3, characterized in that, The third support (33) includes a first frame (331) and a second frame (332) spaced apart along the length of the main arm (1). The first frame (331) is attached to one of the two side plates (311). The auxiliary arm tilting device further includes: A drive cylinder (35) includes a cylinder body (351) and a piston rod (352). The cylinder body (351) is rotatably connected to the first bracket (31). The piston rod (352) is disposed between the first bracket (331) and the second bracket (332) and is rotatably connected to the first bracket (331) and the second bracket (332). The drive cylinder (35) is configured to drive the third bracket (33) to rotate by extending and retracting the piston rod (352) so that the auxiliary arm (2) flips from the side of the main arm (1) to the side below the main arm (1) and flips from the side below the main arm (1) to the side of the main arm (1).

5. The auxiliary arm tilting device according to claim 1, characterized in that, Also includes: A first limiting member (36) is detachably inserted through the second bracket (32) and the third bracket (33) to limit the relative movement of the second bracket (32) and the third bracket (33) at least in the length direction of the main arm (1).

6. The auxiliary arm tilting device according to claim 5, characterized in that, The third support (33) also includes: The first limiting member bracket (333), fixedly connected to the third bracket (33) and detachably connected to the first limiting member (36), is configured to accommodate the first limiting member (36) detached from the second bracket (32) and the third bracket (33).

7. The auxiliary arm tilting device according to claim 5, characterized in that, The third support (33) also includes: A first limiting member bracket (333), fixedly connected to the third bracket (33) and detachably connected to the first limiting member (36), is configured to receive the first limiting member (36) detached from the second bracket (32) and the third bracket (33); and The locking member (361) is detachably connected to the first limiting member (36) to lock the first limiting member (36) contained in the first limiting member bracket (333) and to lock the first limiting member (36) passing through the second bracket (32) and the third bracket (33).

8. The auxiliary arm tilting device according to claim 1, characterized in that, The main arm (1) is extendable and retractable along its length, and the auxiliary arm tilting device further includes: The second limiting member (37) is disposed on the second bracket (32) and detachably inserted through the third bracket (33). The second limiting member (37) is configured to disengage from the third bracket (33) when the second bracket (32) moves in the extension direction of the main arm (1) and to insert into the third bracket (33) when the second bracket (32) moves in the shortening direction of the main arm (1).

9. The auxiliary arm tilting device according to claim 8, characterized in that, The second limiting member (37) is rod-shaped, including a rod body (371) and a collar (372) disposed radially outside the rod body (371). The third bracket (33) includes a limiting hole (334). The rod body (371) is configured to pass through the limiting hole (334) when the second bracket (32) moves in the shortening direction of the main arm (1). The third bracket (33) includes: A first limiting part (3351) is protrudingly disposed on the circumferential outer side of the limiting hole (334) and is configured to limit the collar (372) in the shortening direction of the main arm (1); and The second limiting part (3352), which is spaced apart from the first limiting part (3351) in the extension direction of the main arm (1), is configured to limit the collar (372) radially outward.

10. The auxiliary arm tilting device according to claim 9, characterized in that, The collar (372) is movable along the length of the rod (371), and the second bracket (32) further includes: The second limiting member bracket (321), the second limiting member (37) is disposed on the second limiting member bracket (321); and An elastic element (322) is disposed between the collar (372) and the second limiting element bracket (321).

11. The auxiliary arm tilting device according to claim 8, characterized in that, The second support (32) also includes: The second limiting member bracket (321) and the second limiting member (37) are disposed on the second limiting member bracket (321); The second limiting member (37) also includes: An expansion member (373) is radially inserted into the second limiting member (37) and into the second limiting member bracket (321). The expansion member (373) is configured to expand after being inserted into the second limiting member (37) to be fixedly connected to the second limiting member (37).

12. A crane, characterized in that, Includes the auxiliary arm tilting device as described in any one of claims 1-11.

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