Connecting device of auxiliary arm and main arm, dislocation adjusting method, crane and arm support of crane

Abstract

The invention belongs to the technical field of engineering mechanical equipment, and particularly relates to a connecting device of an auxiliary arm and a main arm, a dislocation adjusting method, a crane and an arm support of the crane. The connecting device at least comprises a first connecting module and a second connecting module which are used for connecting the auxiliary arm and the main arm, the auxiliary arm can adjust the axial position fixedly connected with the main arm through the first connecting module, and the auxiliary arm can move in the axial direction of the main arm through the second connecting module. After the main arm moves forwards or does not retract in place, the degree of freedom of the auxiliary arm in the axial direction of the main arm only needs to be released through the first connecting module, then the second connecting module serves as a moving track of the auxiliary arm to limit the auxiliary arm to move only in the axial direction of the main arm, and at the moment, the auxiliary arm can move in the axial direction of the main arm. The auxiliary arm is still hung on the side portion of the main arm through the first connecting module and the second connecting module, so that an auxiliary crane does not need to participate in the dislocation adjusting process of the auxiliary arm and the main arm, and the dislocation adjusting process of the auxiliary arm and the main arm is time-saving and labor-saving.

Description

Technical Field

[0001] The present application belongs to the technical field of engineering machinery and equipment, and specifically relates to a connecting device and a misalignment adjustment method for a secondary arm and a main arm, a crane and a boom thereof. Background Art

[0002] The crane boom includes a main boom and a jib used in conjunction with the main boom. The jib is connected to the end of the main boom in the use state, that is, it plays the role of extending the main boom. The jib is hung on the side of the main boom in the standby state, that is, it is equipped on the main boom for standby. The connection between the jib and the main boom adopts a pin connection, that is, pin holes are provided on the jib and the main boom. The jib is switched from the standby state to the use state by rotating the jib until the axis of the jib coincides with the axis of the main boom and the pin hole on the jib is aligned with the pin hole on the main boom. Since the weight of the jib and the main boom is large, the position of the jib or the main boom needs to be adjusted before rotation so that the pin hole on the jib can be aligned with the pin hole on the main boom after rotation.

[0003] In the prior art, the auxiliary arm and the main arm are separated and the auxiliary crane is used to adjust the position of the auxiliary arm, and the auxiliary arm is hung on the main arm after the adjustment is completed. For the above-mentioned related technologies, the auxiliary crane is required to participate in the position adjustment process of the auxiliary arm, which makes the adjustment process time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present application is to provide a connecting device and a misalignment adjustment method between a secondary arm and a main arm, a crane and its arm frame, so as to realize the misalignment adjustment process between the secondary arm and the main arm without the need for an auxiliary crane to participate.

[0005] In order to achieve the above-mentioned objectives, on the one hand, the present application provides a connecting device between a secondary arm and a main arm, wherein the connecting device comprises at least a first connecting module and a second connecting module for connecting the secondary arm and the main arm, wherein the secondary arm can adjust the axial position connected and fixed to the main arm through the first connecting module, and the secondary arm can move along the axial direction of the main arm through the second connecting module.

[0006] In some embodiments, the first connection module includes:

[0007] A track member, formed with an adjustment track extending along the axial direction of the main arm;

[0008] An adjusting member, movably matched with the adjusting track;

[0009] A limiting member, detachably connected to the track member and used to fixedly connect the adjusting member and the track member;

[0010] Wherein, the track member is connected to one of the auxiliary arm and the main arm, and the adjusting member is connected to the other of the auxiliary arm and the main arm.

[0011] In some embodiments, the first connecting module also includes a front main arm support connected to the main arm and a front auxiliary arm support connected to the auxiliary arm, the track member includes a track plate arranged on the front auxiliary arm support, the adjustment track includes a first strip hole formed on the track plate, the adjustment member includes a first pin shaft for passing through the front main arm support and the front auxiliary arm support, the limiting member includes a limiting plate with a first pin shaft hole matching the first pin shaft, the first pin shaft passes through the first strip hole and the first pin shaft hole in sequence, and the length of the first strip hole is greater than the aperture of the first pin shaft hole.

[0012] In some embodiments, a threaded hole is provided on the track plate, and the threaded hole is arranged at intervals with the first strip hole along the width direction of the first strip hole. A second strip hole is provided on the limiting plate, and the second strip hole is arranged at intervals with the first pin shaft hole along its own width direction. The length of the second strip hole is greater than or equal to the length of the first strip hole. The connecting device between the auxiliary arm and the main arm also includes a threaded fastener passing through the threaded hole and the second strip hole.

[0013] In some embodiments, the second connection module includes:

[0014] A rod-shaped member extending along the axial direction of the main arm;

[0015] A moving member, which is sleeved on the rod-shaped member and can move along the rod-shaped member;

[0016] Wherein, one of the rod-shaped member and the moving member is connected to the main arm, and the other is connected to the auxiliary arm.

[0017] In some embodiments, the rod-shaped member includes a second pin shaft connected to the auxiliary arm, and the movable member includes a middle main arm support formed with a second pin shaft hole, the middle main arm support is connected to the main arm, and the second pin shaft hole is plug-fitted with the second pin shaft.

[0018] In some embodiments, the second connecting module also includes a middle auxiliary arm support connected to the auxiliary arm, the second pin shaft is detachably connected to the auxiliary arm, and a universal wheel is provided on the middle auxiliary arm support, and the universal wheel can move axially along the main arm on the middle main arm support.

[0019] In some embodiments, the connecting device also includes a third connecting module for connecting the auxiliary arm and the main arm, the third connecting module includes a rear main arm support, a rear auxiliary arm support and a third pin shaft, the rear main arm support is connected to the main arm and can move along the axial direction of the main arm, the rear auxiliary arm support is connected to the auxiliary arm, and the third pin shaft is used to pass through the rear main arm support and the rear auxiliary arm support.

[0020] A second aspect of the present application provides a crane boom, the crane boom comprising:

[0021] Main boom;

[0022] Jib; and

[0023] The connecting device between the auxiliary arm and the main arm as described above.

[0024] A third aspect of the present application provides a crane, comprising the crane boom as described above.

[0025] In a fourth aspect, the present application provides a method for adjusting the misalignment of a secondary arm and a main arm, wherein at least a first connection module and a second connection module are connected between the secondary arm and the main arm, the secondary arm can adjust an axial position connected and fixed to the main arm through the first connection module, and the secondary arm can move along the axial direction of the main arm through the second connection module, and the misalignment adjustment method includes:

[0026] Release the restriction imposed by the first connection module on the relative movement between the auxiliary arm and the main arm along the axial direction of the main arm;

[0027] Pushing the auxiliary arm to move relative to the main arm along the axial direction of the main arm until the misalignment adjustment is completed;

[0028] The connection and fixation between the auxiliary arm and the main arm by the first connecting module is restored.

[0029] Through the above technical solution, the connecting device and misalignment adjustment method of the auxiliary arm and the main arm, the crane and the boom thereof provided by the present application have the following beneficial effects:

[0030] In the standby state, the auxiliary arm is hung on the side of the main arm through the first connecting module and the second connecting module. After the last operation, the main arm may move forward or fail to retract into place, resulting in the pin shaft hole on the telescopic end of the main arm and the pin shaft hole on the auxiliary arm being misaligned along the axial direction of the main arm. Once misalignment occurs, the auxiliary arm cannot be switched from the standby state to the use state. In the present application, the axial freedom of the auxiliary arm along the main arm is released through the first connecting module so that the auxiliary arm can move along the axial direction of the main arm, and the second connecting module is used as the moving track of the auxiliary arm to limit the auxiliary arm to move only along the axial direction of the main arm. At the same time, the first connecting module and the second connecting module are used to ensure that the auxiliary arm is always hung on the side of the main arm during the movement, so that there is no need for the participation of an auxiliary crane, thereby saving time and effort in the misalignment adjustment process of the auxiliary arm and the main arm.

[0031] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0033] Figure 1 It is a structural schematic diagram of a connecting device between a secondary arm and a main arm according to a specific embodiment of the present application;

[0034] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0035] Figure 3 It is a structural schematic diagram of a connecting device between a secondary arm and a main arm (from the right side perspective) according to a specific embodiment of the present application;

[0036] Figure 4 for Figure 3 A magnified schematic diagram of part B;

[0037] Figure 5 It is a structural schematic diagram of a track plate according to a specific embodiment of the present application;

[0038] Figure 6 It is a structural schematic diagram of a limiting plate according to a specific embodiment of the present application;

[0039] Figure 7 It is a structural schematic diagram of a connecting device between a secondary arm and a main arm (from a lower side perspective) according to a specific embodiment of the present application;

[0040] Figure 8 for Figure 7 A magnified schematic diagram of part C;

[0041] Fig. 9 A schematic diagram of a first connection module in a misalignment adjustment process according to a specific embodiment of the present application;

[0042] Fig.10 It is a schematic diagram of adjusting the push auxiliary arm in the misalignment adjustment process according to a specific embodiment of the present application;

[0043] Fig.11 It is a schematic diagram of a third connection module in the misalignment adjustment process according to a specific embodiment of the present application;

[0044] Fig.12 It is a schematic diagram of the auxiliary arm switching from the standby state to the use state according to a specific embodiment of the present application.

[0045] Description of Reference Numerals

[0046] 100. Connecting device; 200. main arm; 300. auxiliary arm; 1. main arm pin shaft hole; 2. auxiliary arm pin shaft hole; 3. first connecting module; 31. track plate; 311. first strip hole; 312. threaded hole; 32. first pin shaft; 33. limiting plate; 331. first pin shaft hole; 332. second strip hole; 34. front main arm support; 35. front auxiliary arm support; 4. second connecting module; 41. second pin shaft; 42. fixing plate; 43. middle main arm support; 44. middle auxiliary arm support; 45. second connecting plate; 46. universal wheel; 5. third connecting module; 51. rear main arm support; 52. rear auxiliary arm support; 53. third pin shaft; 54. third strip hole. DETAILED DESCRIPTION

[0047] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0048] The following describes the connection device between the auxiliary arm and the main arm and the misalignment adjustment method, the crane and the arm frame of the present application with reference to the accompanying drawings.

[0049] Main arm 200: The main arm 200 has a telescopic function and a main arm connecting frame is provided at the head of the main arm 200, and a main arm pin shaft hole 1 is opened on the main arm connecting frame.

[0050] Jib 300: A jib connecting frame is provided at the tail of jib 300, and a jib pin hole 2 is provided on the jib connecting frame. Jib 300 includes a use state and a standby state: In the use state of jib 300: the tail of jib 300 is connected to the head of main arm 200, jib pin hole 2 is aligned with main arm pin hole 1 and connected with a connecting pin, which is mainly used to extend main arm 200 and has a small lifting load; Jib 300 in the standby state: the side of jib 300 is connected to the side of main arm 200, that is, it is hung on main arm 200 for standby. Jib 300 switches from standby state to use state: rotate jib 300 in the horizontal plane until the axis of jib 300 coincides with the axis of main arm 200 and jib pin hole 2 is aligned with main arm pin hole 1, and insert the connecting pin through jib pin hole 2 and main arm pin hole 1.

[0051] Misalignment of the auxiliary arm 300 and the main arm 200: When the main arm 200 is extended and then retracted, the main arm 200 may move forward or fail to retract into place, resulting in misalignment of the main arm connecting frame and the auxiliary arm connecting frame along the axial direction of the main arm 200. As a result, the auxiliary arm pin shaft hole 2 and the main arm pin shaft hole 1 cannot be aligned during the process of switching the auxiliary arm 300 from the standby state to the use state, and thus the auxiliary arm 300 cannot be switched from the standby state to the use state.

[0052] like Figure 1 As shown, a specific embodiment of the present application provides a connecting device 100 between a secondary arm and a main arm, wherein the connecting device 100 includes at least a first connecting module 3 and a second connecting module 4 for connecting the secondary arm 300 and the main arm 200. The secondary arm 300 can be adjusted to a fixed axial position connected to the main arm 200 through the first connecting module 3, and the secondary arm 300 can be moved along the axial direction of the main arm 200 through the second connecting module 4.

[0053] In the standby state, the auxiliary arm 300 is hung on the side of the main arm 200 through the first connecting module 3 and the second connecting module 4. In the use state, the auxiliary arm 300 is connected to the head of the main arm 200 through the connecting pin. When the auxiliary arm 300 is switched from the standby state to the use state, it is necessary to ensure that the auxiliary arm pin shaft hole 2 and the main arm pin shaft hole 1 can be aligned with each other after the auxiliary arm 300 rotates. Since the rotation path of the auxiliary arm 300 is fixed, therefore, by setting the relative position of the auxiliary arm 300 and the main arm 200 in the standby state, it can be ensured that the auxiliary arm pin shaft hole 2 and the main arm pin shaft hole 1 can be aligned with each other after the auxiliary arm 300 rotates. If the main arm 200 moves forward or fails to retract into place, it will cause misalignment of the auxiliary arm 300 and the main arm 200. In the present application, it is only necessary to release the axial freedom of the auxiliary arm 300 along the main arm 200 through the first connecting module 3, and then use the second connecting module 4 as the moving track of the auxiliary arm 300 to limit the auxiliary arm 300 to move only along the axial direction of the main arm 200. At this time, the auxiliary arm 300 is still hung on the side of the main arm 200 through the first connecting module 3 and the second connecting module 4, so that there is no need for an auxiliary crane to participate in the misalignment adjustment process of the auxiliary arm 300 and the main arm 200, thereby saving time and effort in the misalignment adjustment process of the auxiliary arm 300 and the main arm 200.

[0054] It should be noted that, in the description of the present application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "front", "rear", "inside", "outside" and the like indicate directions or positional relationships only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In a specific embodiment of the present application, for the convenience of description, the axial direction of the main arm 200 is the front-to-back direction, the head of the main arm 200 can extend forward and retract backward, the width direction of the main arm 200 is the left-right direction, the auxiliary arm 300 is hung on the right side of the main arm 200 in the standby state, the height direction of the main arm 200 is the up-down direction, and the connecting pin shaft passes through the main arm pin shaft hole 1 and the auxiliary arm pin shaft hole 2 in the use state of the auxiliary arm 300 along the up-down direction, and the arrows in the drawings of the specification represent specific directions.

[0055] like Figure 3 and Figure 4 As shown, in some embodiments, the first connecting module 3 includes a track member, an adjusting member and a limiting member, wherein the track member is formed with an adjusting track extending along the axial direction of the main arm 200; the adjusting member is movably matched with the adjusting track; the limiting member is detachably connected to the track member and is used to fix the adjusting member and the track member; the track member is connected to one of the auxiliary arm 300 and the main arm 200, and the adjusting member is connected to the other of the auxiliary arm 300 and the main arm 200.

[0056] The auxiliary arm 300 and the main arm 200 can achieve relative movement along the front-to-back direction through the movement of the adjusting part and the adjusting track along the front-to-back direction. When the limit part is connected to the track part, the limit part fixes the adjusting part and the track part to limit the freedom of movement of the auxiliary arm 300 along the front-to-back direction. When the limit part is separated from the track part, the limit part releases the freedom of movement of the auxiliary arm 300 along the front-to-back direction.

[0057] like Figures 4 to 6 As shown, specifically, the first connecting module 3 also includes a front main arm support 34 connected to the main arm 200 and a front auxiliary arm support 35 connected to the auxiliary arm 300, the track member includes a track plate 31 arranged on the front auxiliary arm support 35, the adjustment track includes a first strip hole 311 formed on the track plate 31, the adjustment member includes a first pin shaft 32 for passing through the front main arm support 34 and the front auxiliary arm support 35, the limiting member includes a limiting plate 33 with a first pin shaft hole 331 matching the first pin shaft 32, the first pin shaft 32 passes through the first strip hole 311 and the first pin shaft hole 331 in sequence, and the length of the first strip hole 311 is greater than the aperture of the first pin shaft hole 331.

[0058] Furthermore, the track plate 31 is fixedly connected to the front auxiliary arm support 35 and the track plate 31 is arranged horizontally; the limit plate 33 is detachably installed under the track plate 31 and the limit plate 33 is arranged horizontally, and the first pin shaft hole 331 is located within the range of the first strip hole 311; the front main arm support 34 includes two first connecting plates arranged at intervals in the up-down direction, and a plug-in gap is formed between the two first connecting plates, and the two first connecting plates are provided with first connecting holes and the two first connecting holes are aligned in the up-down direction.

[0059] When the limiter is connected to the track member, after the track plate 31 and the limiter are inserted into the plug-in gap, the first pin shaft 32 passes through the two first connecting holes, the first strip hole 311 and the first pin shaft hole 331, so as to limit the freedom of the first pin shaft 32 to move along the front-to-back direction of the first connecting hole through the first pin shaft hole 331; when the limiter is separated from the track member, after the track plate 31 is inserted into the plug-in gap, the first pin shaft 32 passes through the two first connecting holes and the first strip hole 311, so as to release the freedom of the first pin shaft 32 to move along the front-to-back direction of the first connecting hole.

[0060] In the present application, simple components such as a track plate 31, a first pin shaft 32 and a limit plate 33 are used to enable the auxiliary arm 300 and the main arm 200 to move relative to each other in the front-to-back direction while being connected, thereby simplifying the structure while achieving the required functions, thereby reducing the cost and assembly difficulty of the connecting device 100 between the auxiliary arm and the main arm.

[0061] It should be noted that the track members and limit members may adopt various other shapes besides plates, such as blocks, spheres, etc. The use of plates can reduce the size of the track members and facilitate the connection between the track members and the front auxiliary arm supports 35; the adjusting members may adopt other forms besides pins, such as screws, square rods, etc.; the adjusting tracks may adopt other forms besides bar holes, such as grooves, etc.

[0062] Preferably, the length range of the first strip hole 311 is set to 20 mm to 30 mm based on experience, so that the length range of the first strip hole 311 covers the misalignment range of the auxiliary arm 300 and the main arm 200 , while reducing the size of the track plate 31 .

[0063] like Figure 5 and Figure 6 As shown, in some embodiments, a threaded hole 312 is provided on the track plate 31, and the threaded hole 312 is spaced apart from the first strip hole 311 along the width direction of the first strip hole 311, and a second strip hole 332 is provided on the limiting plate 33, and the second strip hole 332 is spaced apart from the first pin shaft hole 331 along its own width direction, and the length of the second strip hole 332 is greater than or equal to the length of the first strip hole 311, and the connecting device 100 between the auxiliary arm and the main arm also includes a threaded fastener passing through the threaded hole 312 and the second strip hole 332.

[0064] Specifically, the threaded hole 312 is arranged on the right side of the first strip hole 311, and the second strip hole 332 is arranged on the right side of the first pin hole 331. The threaded hole 312 and the second strip hole 332 can be aligned to penetrate the threaded fastener to realize the detachable connection between the limit plate 33 and the track plate 31. The length direction of the second strip hole 332 is consistent with the length direction of the first strip hole 311, and the width direction of the second strip hole 332 is consistent with the width direction of the first strip hole 311.

[0065] After the limit plate 33 is separated from the track plate 31, the auxiliary arm 300 and the main arm 200 are adjusted in misalignment. During the misalignment adjustment process, the auxiliary arm 300 is pushed to move in the front-to-back direction, the front auxiliary arm support 35 moves along with the auxiliary arm 300, the track plate 31 moves along with the front auxiliary arm support 35, and the front main arm support 34 and the first pin shaft 32 remain in position along with the main arm 200. In other words, the relative movement of the first pin shaft 32 and the first strip hole 311 is actually the movement of the first strip hole 311 in the front-to-back direction.

[0066] After the misalignment adjustment of the auxiliary arm 300 and the main arm 200 is completed, the position of the first pin shaft 32 remains unchanged while the position of the track plate 31 changes, wherein the position of the first pin shaft 32 remains unchanged and the position of the first pin shaft hole 331 on the limiting plate 33 remains unchanged, that is, the position of the limiting plate 33 remains unchanged, and the position of the track plate 31 changes and the position of the threaded hole 312 changes. In other words, connecting the limiting plate 33 requires that the second strip hole 332 on the limiting plate 33 covers the position change range of the threaded hole 312, and the position change range of the threaded hole 312 is always smaller than the length of the first strip hole 311.

[0067] Preferably, the number of the threaded holes 312 is two, the number of the second strip-shaped holes 332 is two, and the two second strip-shaped holes 332 and the two threaded holes 312 are arranged in one-to-one correspondence to strengthen the connection strength between the limiting plate 33 and the track plate 31 .

[0068] Further preferably, the center line of the first strip hole 311 extending in the left-right direction passes through the centers of the two threaded holes 312 , and the center lines of the two second strip holes 332 extending in the left-right direction coincide with each other and pass through the center of the first pin shaft hole 331 .

[0069] In the present application, by utilizing the threaded hole 312 and the second bar hole 332 and setting the length of the second bar hole 332 to be greater than or equal to the length of the first bar hole 311, it is possible to achieve a detachable connection between the limit plate 33 and the track plate 31, thereby simplifying the structure while achieving the required functions, thereby reducing the cost and assembly difficulty of the connecting device 100 between the auxiliary arm and the main arm.

[0070] like Figure 7 and Figure 8 As shown, in some embodiments, the second connection module 4 includes a rod-shaped member and a moving member, the rod-shaped member extends along the axial direction of the main arm 200, the moving member is sleeved on the rod-shaped member and can move along the rod-shaped member, one of the rod-shaped member and the moving member is connected to the main arm 200, and the other is connected to the auxiliary arm 300. The plug-in cooperation between the rod-shaped member and the moving member not only releases the degree of freedom of the auxiliary arm 300 to move in the front-rear direction, but also can support and connect the auxiliary arm 300 to the main arm 200.

[0071] Specifically, the rod-shaped part includes a second pin shaft 41 connected to the auxiliary arm 300, and the movable part includes a middle main arm support 43 formed with a second pin shaft hole. The middle main arm support 43 is connected to the main arm 200, and the second pin shaft hole is plugged into and matched with the second pin shaft 41. It can be seen that the second pin shaft 41 supports and guides the middle main arm support 43.

[0072] Furthermore, the second connection module 4 also includes a middle auxiliary arm support 44, and a universal wheel 46 is provided on the middle auxiliary arm support 44. The universal wheel 46 is located above the middle main arm support 43 and can move in the front-to-back direction on the middle main arm support 43. The width of the middle main arm support 43 in the front-to-back direction is greater than or equal to the length of the first strip hole 311 in the front-to-back direction. By setting the universal wheel 46 and the middle main arm support 43 to move in coordination, the auxiliary arm 300 is assisted in moving in the front-to-back direction, thereby reducing the wear between the middle main arm support 43 and the second pin shaft 41, thereby increasing the service life of the connecting device 100 of the auxiliary arm and the main arm.

[0073] At the same time, the universal wheel 46 is supported by the middle main arm support 43, thereby reducing the supporting effect of the second pin shaft 41 on the auxiliary arm 300, thereby improving the safety and reliability of the connecting device 100 between the auxiliary arm and the main arm.

[0074] In addition, the length of the second pin shaft 41 along the front-to-back direction is greater than or equal to the length of the first strip hole 311, so as to ensure that when the auxiliary arm 300 moves along the front-to-back direction, the middle main arm support 43 is always mounted on the second pin shaft 41, so that the auxiliary arm 300 and the main arm 200 are always connected through the second pin shaft 41 and the middle main arm support 43, thereby improving the safety and reliability of the connecting device 100 between the auxiliary arm and the main arm.

[0075] Furthermore, the second connecting module 4 also includes a fixing plate 42 connected to the upper chord of the auxiliary arm 300, and a detachable second connecting plate is provided on the fixing plate 42. The second pin shaft 41 is penetrated on the second connecting plate 45 along the front-to-back direction and is plugged into and matched with the second pin shaft hole. The second pin shaft 41 is separated from the middle main arm support 43 by the detachable second connecting plate, so as to at least release the freedom of the auxiliary arm 300 to move in the left and right directions, so that the auxiliary arm 300 can rotate in the horizontal plane, and then the auxiliary arm 300 can be switched from the standby state to the use state.

[0076] The universal wheel 46 on the middle auxiliary arm support 44 can move on the main arm support 43 when the auxiliary arm 300 is switched from the standby state to the use state or from the use state to the standby state, playing a guiding and supporting role in the deployment and recovery of the auxiliary arm 300.

[0077] In a specific embodiment of the present application, the process of using the first connecting module 3 and the second connecting module 4 to adjust the misalignment of the auxiliary arm 300 and the main arm 200 is as follows: first, pull out the first pin shaft 32 and remove the limiting plate 33; secondly, insert the first pin shaft 32 to connect the first connecting hole and the first strip hole 311; then, push the auxiliary arm 300 in the front-to-back direction until the misalignment of the auxiliary arm pin shaft hole 2 and the main arm pin shaft hole 1 is eliminated; then, pull out the first pin shaft 32, install the limiting plate 33; finally, insert the first pin shaft 32 to connect the first connecting hole, the first strip hole 311 and the first pin shaft hole 331.

[0078] It can be seen that the entire adjustment process is very convenient, and the auxiliary arm 300 and the main arm 200 are connected by the middle main arm support 43 being sleeved on the second pin shaft 41, and the first pin shaft 32 passing through the first connecting hole and the first strip hole 311, so that there is no need for an auxiliary crane to participate in the misalignment adjustment process of the auxiliary arm 300 and the main arm 200, thereby making the misalignment adjustment process of the auxiliary arm 300 and the main arm 200 save time and effort.

[0079] Preferably, the fixed plate 42, the second connecting plate 45 and the second pin 41 are arranged in groups and the number is multiple, so as to reduce the load that each group of the fixed plate 42, the second connecting plate 45 and the second pin 41 needs to bear, thereby improving the carrying capacity of the second connecting module 4, and further improving the safety of the connecting device 100 between the auxiliary arm and the main arm.

[0080] like Figure 1 and Figure 2 As shown, in some embodiments, the connecting device 100 between the auxiliary arm and the main arm also includes a third connecting module 5 for connecting the auxiliary arm 300 and the main arm 200, and the third connecting module 5 includes a rear main arm support 51, a rear auxiliary arm support 52 and a third pin 53. The rear main arm support 51 is connected to the main arm 200 and can move along the axial direction of the main arm 200, the rear auxiliary arm support 52 is connected to the auxiliary arm 300, and the third pin 53 is used to penetrate the rear main arm support 51 and the rear auxiliary arm support 52.

[0081] The first connection module 3, the second connection module 4 and the third connection module 5 are sequentially arranged between the main arm 200 and the auxiliary arm 300 in the front-to-back direction, wherein the first connection module 3 is arranged near the head of the main arm 200, the second connection module 4 is arranged near the middle of the main arm 200, and the third connection module 5 is arranged near the tail of the main arm 200. Since the auxiliary arm 300 is relatively long, at least three connection points are arranged between the auxiliary arm 300 and the main arm 200 to effectively ensure the connection stability between the two.

[0082] The rear auxiliary arm support 52 includes two third connecting plates, both of which are provided with third connecting holes and the two third connecting holes are aligned in the up-down direction, and a third pin shaft hole is formed on the rear main arm support 51, and the rear main arm support 51 can extend between the two third connecting plates and the third connecting hole is aligned with the third pin shaft hole in the up-down direction so that the third pin shaft 53 can be connected, thereby realizing the connection between the rear main arm support 51 and the rear auxiliary arm support 52.

[0083] Obviously, in the process of adjusting the misalignment of the auxiliary arm 300 and the main arm 200, it is necessary to pull out the third pin shaft 53 to release the freedom of the auxiliary arm 300 to move in the front-to-back direction. After completing the misalignment adjustment of the auxiliary arm 300 and the main arm 200, since the auxiliary arm 300 drives the rear auxiliary arm support 52 to move in the front-to-back direction, the third connecting hole and the third pin shaft hole are misaligned in the front-to-back direction and the third pin shaft 53 cannot be inserted. At this time, the third pin shaft hole and the third connecting hole can be aligned again by synchronously moving the rear main arm support 51, thereby realizing the connection between the auxiliary arm 300 and the main arm 200.

[0084] Specifically, the main arm 200 is provided with a protruding portion protruding to the right, and a third strip hole 54 extending in the front-to-back direction is formed on the protruding portion. The rear main arm support 51 includes a moving portion and a plug-in portion. The moving portion extends in the left-right direction and the right end of the moving portion is connected to the protruding portion by a bolt passing through the third strip hole 54. The plug-in portion extends in the front-to-back direction and the rear end of the plug-in portion is connected to the front end of the moving portion. A third pin shaft hole is opened on the plug-in portion and the plug-in portion is plug-fitted with the plug-in clearance of the rear auxiliary arm support 52.

[0085] Furthermore, the length of the third strip hole 54 is greater than or equal to the length of the first strip hole 311 to ensure that the adjustment range of the rear main arm support 51 is greater than or equal to the misalignment adjustment range of the auxiliary arm 300 and the main arm 200, thereby improving the reliability of the connecting device 100 between the auxiliary arm and the main arm.

[0086] like Figures 9 to 11 As shown, in a specific embodiment of the present application, the process of using the first connection module 3, the second connection module 4 and the third connection module 5 to adjust the misalignment of the auxiliary arm 300 and the main arm 200 is:

[0087] First, pull out the first pin shaft 32 and remove the limiting plate 33. Secondly, insert the first pin shaft 32 to connect the first connecting hole and the first strip hole 311. Then, pull out the third pin shaft 53. Subsequently, push the auxiliary arm 300 in the front-to-back direction until the misalignment of the auxiliary arm pin shaft hole 2 and the main arm pin shaft hole 1 is eliminated. Subsequently, adjust the position of the rear main arm support 51 in the front-to-back direction until the third pin shaft hole and the third connecting hole are aligned. Then, insert the third pin shaft 53 to connect the third pin shaft hole and the third connecting hole. Then, pull out the first pin shaft 32, install the limiting plate 33, and finally, insert the first pin shaft 32 to connect the first connecting hole, the first strip hole 311 and the first pin shaft hole 331.

[0088] like Fig.12As shown, in a specific embodiment of the present application, there are two groups of main arm pin shaft holes 1, and the two groups of main arm pin shaft holes 1 are respectively located on the left and right sides of the head of the main arm 200, and there are two groups of auxiliary arm pin shaft holes 2, and the two groups of auxiliary arm pin shaft holes 2 are respectively located on the left and right sides of the tail of the auxiliary arm 300, and the tail of the auxiliary arm 300 is connected to the head of the main arm 200 through a connecting pin that penetrates the main arm pin shaft hole 1 and the auxiliary arm pin shaft hole 2. The process of switching the auxiliary arm 300 from the standby state to the use state is:

[0089] First, pull out the third pin 53, remove the second connecting plate 45 and the second pin 41, and then push the auxiliary arm 300 to rotate with the axis of the first pin 32 as the rotation axis in the direction away from the main arm 200 until the auxiliary arm pin hole 2 on the left is aligned with the main arm pin hole 1 on the right in the up and down direction, then, insert the connecting pin to connect the auxiliary arm pin hole 2 on the left and the main arm pin hole 1 on the right, pull out the first pin 32, and then push the auxiliary arm 300 to continue to rotate with the axis of the connecting pin as the rotation axis in the direction away from the main arm 200 until the auxiliary arm pin hole 2 on the right is aligned with the main arm pin hole 1 on the left in the up and down direction, finally, insert the connecting pin to connect the auxiliary arm pin hole 2 on the right and the main arm pin hole 1 on the left.

[0090] Those skilled in the art can understand that the process of switching the auxiliary arm 300 from the use state to the standby state can be performed in the reverse order of the above sequence.

[0091] The specific embodiment of the present application also provides a crane boom, which includes a main boom 200, a secondary boom 300, and a connecting device 100 between the secondary boom and the main boom. Since the crane boom adopts all embodiments of the connecting device 100 between the secondary boom and the main boom, the crane boom has all the beneficial effects brought by the connecting device 100.

[0092] The specific embodiment of the present application also provides a crane, the crane comprising a crane boom. Since the crane boom adopts all embodiments of the crane boom, the crane has all the beneficial effects brought by the crane boom.

[0093] The specific embodiment of the present application also provides a method for adjusting the misalignment of a secondary arm and a main arm. At least a first connection module 3 and a second connection module 4 are connected between the secondary arm 300 and the main arm 200. The secondary arm 300 can adjust the axial position of the connection and fixation with the main arm 200 through the first connection module 3, and the secondary arm 300 can move along the axial direction of the main arm 200 through the second connection module 4. The misalignment adjustment method includes:

[0094] Step S1: releasing the restriction imposed by the first connection module 3 on the relative movement between the auxiliary arm 300 and the main arm 200 along the axial direction of the main arm 200;

[0095] Step S2: pushing the auxiliary arm 300 to move relative to the main arm 200 along the axial direction of the main arm 200 until the misalignment adjustment is completed;

[0096] Step S3: Restoring the connection and fixation of the auxiliary arm 300 and the main arm 200 by the first connecting module 3 .

[0097] During the entire misalignment adjustment process, the auxiliary arm 300 is always hung on the main arm 200 through the first connecting module 3 and the second connecting module 4. In other words, there is no need to use an auxiliary crane to lift the auxiliary arm 300 to assist the auxiliary arm 300 in axial movement along the main arm 200. It can be seen that the misalignment adjustment process of the auxiliary arm 300 and the main arm 200 saves time and effort.

[0098] In some embodiments, a third connection module 5 is further provided between the auxiliary arm 300 and the main arm 200, and the third connection module 5 is used to connect and fix the auxiliary arm 300 and the main arm 200. The misalignment adjustment method further includes:

[0099] Step S1': releasing the connection and fixation between the auxiliary arm 300 and the main arm 200 by the third connection module 5;

[0100] Step S3': restoring the connection and fixation of the auxiliary arm 300 and the main arm 200 by the third connection module 5;

[0101] Wherein, step S1' is executed after step S1, and step S3' is executed before step S3.

[0102] Since the auxiliary arm 300 is relatively long, at least three connection points are provided between the auxiliary arm 300 and the main arm 200 to effectively ensure the connection stability between the two. In other words, adding the third connection module 5 is conducive to improving the safety and stability during the misalignment adjustment process.

[0103] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0104] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0106] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A connecting device between a secondary arm and a main arm, characterized in that: The connecting device (100) comprises at least a first connecting module (3) and a second connecting module (4) for connecting the auxiliary arm (300) and the main arm (200); the auxiliary arm (300) can adjust the axial position of the auxiliary arm (300) connected and fixed to the main arm (200) through the first connecting module (3); and the auxiliary arm (300) can move along the axial direction of the main arm (200) through the second connecting module (4).

2. The connecting device between the auxiliary arm and the main arm according to claim 1, characterized in that: The first connection module (3) comprises: A track member, formed with an adjustment track extending along the axial direction of the main arm (200); An adjusting member, movably matched with the adjusting track; A limiting member, detachably connected to the track member and used to fixedly connect the adjusting member and the track member; The track member is connected to one of the auxiliary arm (300) and the main arm (200), and the adjustment member is connected to the other of the auxiliary arm (300) and the main arm (200).

3. The connecting device between the auxiliary arm and the main arm according to claim 2, characterized in that: The first connecting module (3) also includes a front main arm support (34) connected to the main arm (200) and a front auxiliary arm support (35) connected to the auxiliary arm (300); the track member includes a track plate (31) arranged on the front auxiliary arm support (35); the adjustment track includes a first strip hole (311) formed on the track plate (31); the adjustment member includes a first pin shaft (32) for passing through the front main arm support (34) and the front auxiliary arm support (35); the limiting member includes a limiting plate (33) provided with a first pin shaft hole (331) matching the first pin shaft (32); the first pin shaft (32) passes through the first strip hole (311) and the first pin shaft hole (331) in sequence; the length of the first strip hole (311) is greater than the aperture of the first pin shaft hole (331).

4. The connecting device between the auxiliary arm and the main arm according to claim 3, characterized in that: The track plate (31) is provided with a threaded hole (312), and the threaded hole (312) is arranged at intervals from the first strip hole (311) along the width direction of the first strip hole (311). The limiting plate (33) is provided with a second strip hole (332), and the second strip hole (332) is arranged at intervals from the first pin shaft hole (331) along its own width direction. The length of the second strip hole (332) is greater than or equal to the length of the first strip hole (311). The connecting device (100) between the auxiliary arm (300) and the main arm (200) further includes a threaded fastener penetrating the threaded hole (312) and the second strip hole (332).

5. The connecting device between the auxiliary arm and the main arm according to claim 1, characterized in that: The second connection module (4) comprises: A rod-shaped member extending along the axial direction of the main arm (200); A moving member, which is sleeved on the rod-shaped member and can move along the rod-shaped member; Wherein, one of the rod-shaped member and the moving member is connected to the main arm (200), and the other is connected to the auxiliary arm (300).

6. The connecting device between the auxiliary arm and the main arm according to claim 5, characterized in that: The rod-shaped member includes a second pin shaft (41) connected to the auxiliary arm (300), and the movable member includes a middle main arm support (43) formed with a second pin shaft hole, the middle main arm support (43) is connected to the main arm (200), and the second pin shaft hole is plug-fitted with the second pin shaft (41).

7. The connecting device between the auxiliary arm and the main arm according to claim 6, characterized in that: The second connection module (4) also includes a middle auxiliary arm support (44) connected to the auxiliary arm (300), the second pin shaft (41) is detachably connected to the auxiliary arm (300), and a universal wheel (46) is provided on the middle auxiliary arm support (44), and the universal wheel (46) can move axially along the main arm (200) on the middle main arm support (43).

8. The connecting device between the auxiliary arm and the main arm according to claim 1, characterized in that: The connecting device (100) further comprises a third connecting module (5) for connecting the auxiliary arm (300) and the main arm (200), the third connecting module (5) comprising a rear main arm support (51), a rear auxiliary arm support (52) and a third pin shaft (53), the rear main arm support (51) being connected to the main arm (200) and being movable along the axial direction of the main arm (200), the rear auxiliary arm support (52) being connected to the auxiliary arm (300), and the third pin shaft (53) being used for penetrating the rear main arm support (51) and the rear auxiliary arm support (52).

9. A crane boom, characterized in that: The crane jib comprises: Main arm (200); A jib (300); and A connecting device (100) between a secondary arm and a main arm according to any one of claims 1 to 8.

10. A crane, characterized in that: The crane comprises a crane jib according to claim 9.

11. A method for adjusting the misalignment of a secondary arm and a main arm, characterized in that: At least a first connection module (3) and a second connection module (4) are connected between the auxiliary arm (300) and the main arm (200); the auxiliary arm (300) can adjust an axial position of being connected and fixed to the main arm (200) through the first connection module (3); the auxiliary arm (300) can move along the axial direction of the main arm (200) through the second connection module (4); and the misalignment adjustment method comprises: releasing the restriction imposed by the first connection module (3) on the relative movement between the auxiliary arm (300) and the main arm (200) along the axial direction of the main arm (200); Pushing the auxiliary arm (300) to move relative to the main arm (200) along the axial direction of the main arm (200) until the misalignment adjustment is completed; The connection and fixation between the auxiliary arm (300) and the main arm (200) by the first connection module (3) is restored.

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