A folding sub-arm auxiliary folding and unfolding device, folding sub-arm assembly and crane

Abstract

The application provides a folding auxiliary folding device of a vice arm, a folding vice arm assembly and a crane, and relates to the technical field of cranes.The folding auxiliary folding device of the vice arm comprises a connecting beam, a roller mounting seat, a first roller and a second roller.The connecting beam is used for being connected with a truss arm of the vice arm.The one end of the roller mounting seat is rotationally connected with the connecting beam.The other end of the roller mounting seat is connected with the first roller and the second roller on the two sides along the rotation direction respectively.The first roller and the second roller are used for rolling along the vice arm bracket.The folding auxiliary folding device of the vice arm of the application can rotate the roller mounting seat relative to the truss arm around the first axis, and adjust the horizontal height of the first roller and the second roller, so that the first roller and the second roller can always contact with the vice arm bracket, the overturning torque is eliminated, and the folding stability is better.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and more specifically, to a folding boom auxiliary extension and retraction device, a folding boom assembly, and a crane. Background Technology

[0002] Cranes, as heavy-duty engineering machinery, are widely used in today's society. When relocating existing cranes, to avoid excessive overall width, the jib needs to be folded back onto the jib bracket on one side of the main boom. Since the jib bracket typically has an inclined section and a horizontal straight section along its length, and the jib's truss arm has two rollers, the jib can move from the inclined section to the horizontal straight section with the help of these rollers during folding. However, because the two rollers on the truss arm are always at the same horizontal height, only one roller can contact the inclined section of the bracket at the beginning of the folding process. This results in the jib being subjected to a turning torque, leading to poor folding stability. Summary of the Invention

[0003] The present invention aims to solve the technical problem of poor stability when the auxiliary boom of an existing crane is folded and retracted.

[0004] In a first aspect, the present invention proposes a folding boom auxiliary extension and retraction device, comprising a connecting beam, a roller mounting seat, a first roller and a second roller. The connecting beam is used to connect with the truss arm of the boom. One end of the roller mounting seat is rotatably connected to the connecting beam, and the other end of the roller mounting seat is connected to the first roller and the second roller on both sides along the rotation direction, respectively. The first roller and the second roller are used to roll along the boom bracket.

[0005] The folding arm auxiliary retraction device of the present invention mounts a first roller and a second roller onto a roller mounting base. The roller mounting base is rotatably connected to a connecting beam around a first axis. The connecting beam is connected to the truss arm of the arm, allowing the roller mounting base to rotate relative to the truss arm around the first axis. Since the first roller and the second roller are located on opposite sides of the roller mounting base along the rotation direction, the roller mounting base will drive the first roller and the second roller to rotate together during rotation. One roller will rise while the other roller will fall, meaning the first roller and the second roller can be at the same horizontal height or at different horizontal heights. When the arm is folded until one of the first roller and the second roller contacts the inclined section of the arm bracket, for example, when the first roller contacts the inclined section, the roller mounting base rotates clockwise or counterclockwise around the first axis, causing the height of the second roller to decrease, so that it can also contact the inclined section of the arm bracket. In this way, the first roller and the second roller can always contact the arm bracket, eliminating the overturning torque, resulting in more balanced force and better folding stability.

[0006] Optionally, the folding arm auxiliary retraction device further includes a first pin, and one end of the roller mounting seat is rotatably connected to the connecting beam via the first pin.

[0007] Optionally, the folding arm auxiliary retraction device further includes a second pin, wherein the first roller and the second roller are respectively connected to the roller mounting seat through the corresponding second pin, and the axial direction of the second pin is parallel to the axial direction of the first pin.

[0008] Optionally, the folding arm auxiliary retraction device further includes a buffer mechanism, which is disposed between the connecting beam and the roller mounting base.

[0009] Optionally, the buffer mechanism is a tension spring, and the two sides of the roller mounting base along the rotation direction are respectively connected to the two ends of the connecting beam through corresponding tension springs; when the roller mounting base rotates relative to the connecting beam, one of the two tension springs extends and the other tension spring shortens.

[0010] Optionally, the two tension springs are arranged symmetrically, and the distance between the two tension springs gradually decreases from the end closer to the connecting beam towards the roller mounting seat.

[0011] Optionally, the folding arm auxiliary retraction device further includes a fixed shaft, which is mounted on the connecting beam, and the tension spring is connected to the fixed shaft.

[0012] Optionally, the roller mounting base is provided with a tie rod hole for connecting a tie rod, and the auxiliary arm bracket has an inclined section. When the heights of the first roller and the second roller are both lower than the height of the inclined section, the tie rod is used to drive the roller mounting base to rotate relative to the connecting beam so that the first roller or the second roller contacts the inclined section.

[0013] Secondly, this invention proposes a folding boom assembly, including a boom, a boom bracket, and the aforementioned folding boom auxiliary retraction and deployment device. The boom includes a truss arm, and the connecting beam of the folding boom auxiliary retraction and deployment device is connected to the truss arm. The boom is retracted onto the boom bracket via the folding boom auxiliary retraction and deployment device. The advantages of the folding boom assembly of this invention compared to the prior art are the same as those of the aforementioned folding boom auxiliary retraction and deployment device, and will not be repeated here.

[0014] Thirdly, the present invention provides a crane comprising the aforementioned folding auxiliary boom assembly and a main boom, wherein the auxiliary boom bracket of the folding auxiliary boom assembly is mounted on the main boom. The advantages of the crane of the present invention compared to the prior art are the same as those of the aforementioned folding auxiliary boom assembly, and will not be repeated here. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of the folding auxiliary arm extension and retraction device and the truss arm according to an embodiment of the present invention;

[0016] Figure 2 This is a diagram showing the state of the folding arm auxiliary retraction device according to an embodiment of the present invention as it rolls on the inclined section of the arm bracket.

[0017] Figure 3 This is a state diagram of the folding arm auxiliary retraction device according to an embodiment of the present invention when it rolls on the horizontal straight section of the arm bracket;

[0018] Figure 4 This is a diagram showing the state of the folding arm auxiliary retraction device in an embodiment of the present invention when it is lower than the arm support.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Connecting beam; 2. Roller mounting seat; 21. Tie rod hole; 3. First roller; 4. Second roller; 5. First pin; 6. Second pin; 7. Tension spring; 8. Fixed shaft; 9. Truss arm; 10. Sub-arm bracket; 101. Inclined section; 102. Horizontal straight section; 11. Tie rod; L1. First axis. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fitting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In addition, it should be noted that in the description of the present invention, terms such as "upper," "lower," "front," and "rear" used to indicate orientation in various embodiments are only for simplifying the description of the positional relationships based on the accompanying drawings and do not mean that the elements and devices referred to must be operated in accordance with the specific orientation and limited operation, method, and structure in the specification. Such directional terms do not constitute a limitation on the present invention.

[0024] This paper establishes a coordinate system XYZ, where the positive direction of the X-axis represents the front and the negative direction of the X-axis represents the back; the positive direction of the Y-axis represents the left and the negative direction of the Y-axis represents the right; and the positive direction of the Z-axis represents the top and the negative direction of the Z-axis represents the bottom.

[0025] When relocating existing cranes, it is generally required to travel with the jib attached for convenience. If the jib is in the extended state as it is when working, the width of the entire crane will be too large, making it impossible to travel normally on the road. In this case, folding and retracting the jib is a better solution.

[0026] like Figure 1 As shown, an embodiment of the present invention provides a folding arm auxiliary retraction and extension device, including a connecting beam 1, a roller mounting seat 2, a first roller 3, and a second roller 4. The connecting beam 1 is used to connect to the truss arm 9 of the arm. One end of the roller mounting seat 2 is rotatably connected to the connecting beam 1, and the other end of the roller mounting seat 2 is connected to the first roller 3 and the second roller 4 on both sides along the rotation direction, respectively. The first roller 3 and the second roller 4 are used to roll along the arm bracket 10.

[0027] In this embodiment, the first axis L1 is set along the left-right direction, that is, the direction shown by the Y axis, and the length direction of the auxiliary arm bracket 10 is the direction shown by the X axis. When the auxiliary arm is folded and retracted towards the auxiliary arm bracket, the first roller 3 and the second roller 4 are set one in front of the other along the direction shown by the X axis. The first roller 3 is located in front of the second roller 4. The first roller 3 and the second roller 4 can roll from the rear end of the auxiliary arm bracket 10 to the front end of the auxiliary arm bracket 10.

[0028] Here, the truss arm 9 can be formed by connecting two main chord tubes and multiple supporting chord tubes between the two main chord tubes. The connecting beam 1 can be a curved beam or a straight beam. The two ends of the connecting beam 1 are respectively connected to the two main chord tubes of the truss arm 9.

[0029] The first roller 3 and the second roller 4 are installed onto the roller mounting base 2. The roller mounting base 2 is rotatably connected to the connecting beam 1 around the first axis L1. The connecting beam 1 is connected to the truss arm 9 of the auxiliary arm, allowing the roller mounting base 2 to rotate back and forth relative to the truss arm 9 around the first axis L1. Since the first roller 3 and the second roller 4 are located on the front and rear sides of the roller mounting base 2 along the direction of rotation, the roller mounting base 2 will drive the first roller 3 and the second roller 4 to rotate together during rotation. One roller will rise and the other roller will fall. Adjusting the first roller 3 and the second roller 4... The horizontal height of roller 4, that is, the first roller 3 and the second roller 4 can be at the same horizontal height or at different horizontal heights. Since the first roller 3 and the second roller 4 are arranged along the length of the auxiliary boom bracket 10, when the auxiliary boom is folded down to contact either the first roller 3 or the second roller 4 with the inclined section 101 of the auxiliary boom bracket 10, for example, the first roller 3 contacts the inclined section 101. At this time, the roller mounting base 2 rotates clockwise around the first axis L1, causing the height of the second roller 4 to decrease, so that it can also contact the inclined section 101 of the auxiliary boom bracket 10. Figure 2-3As shown, this ensures that the first roller 3 and the second roller 4 are always in contact with the auxiliary arm bracket 10, eliminating the overturning torque, resulting in more balanced force and better folding stability.

[0030] like Figure 1 As shown, optionally, the folding arm auxiliary retraction device also includes a first pin 5, and one end of the roller mounting seat 2 is rotatably connected to the connecting beam 1 through the first pin 5.

[0031] In this embodiment, the first pin 5 is arranged along the Y-axis, and the upper end of the roller mounting base 2 is rotatably connected to the connecting beam 1 via the first pin 5, making the installation simple and convenient. In some other embodiments, a hinge connection can also be used to achieve the rotation of the roller mounting base 2 relative to the truss arm 9.

[0032] The roller mounting base 2 includes an upper seat body and a lower support plate. The seat body is vertically arranged, and the upper end of the seat body is rotatably connected to the connecting beam 1 through a first pin 5. The support plate is horizontally arranged, and the bottom of the support plate is connected to a first roller 3 and a second roller 4.

[0033] like Figure 1 As shown, optionally, the folding arm auxiliary retraction device further includes a second pin 6. The first roller 3 and the second roller 4 are respectively connected to the roller mounting base 2 through the corresponding second pin 6. The axial direction of the second pin 6 is parallel to the axial direction of the first pin 5.

[0034] In this embodiment, the second pin 6 is arranged along the Y-axis, and the first roller 3 and the second roller 4 rotate around the corresponding second pin 6 to achieve forward and backward movement along the X-axis. The second pin 6 enables the two rollers to be mounted on the roller mounting base 2.

[0035] Here, the lines connecting the mounting points of the two second pins 6 and the first pin 5 form a triangle. The axis of the second pin 6 is parallel to the axis of the first pin 5. When the height is uneven, one of the first roller 3 and the second roller 4 is raised and the other is lowered, so that the two rollers contact the high surface and the low surface respectively, thereby driving the roller mounting base 2 to rotate around the first pin 5, so as to achieve adaptive adjustment of the height of the two rollers.

[0036] Optionally, the folding arm auxiliary retraction device further includes a buffer mechanism, which is located between the connecting beam 1 and the roller mounting base 2.

[0037] In this embodiment, the buffer mechanism is used to reduce the rigid impact and vibration between the jib and the jib bracket, improve the strength at the jib rotation hinge point, reduce damage to the jib, jib bracket and rollers, and improve the overall service life of the crane.

[0038] like Figure 1 As shown, optionally, the buffer mechanism is a tension spring 7, and the two sides of the roller mounting seat 2 along the rotation direction are respectively connected to the two ends of the connecting beam 1 through the corresponding tension spring 7; when the roller mounting seat 2 rotates relative to the connecting beam 1, one of the two tension springs 7 extends and the other tension spring 7 shortens.

[0039] In this embodiment, when the auxiliary boom is working, the roller mounting base 2 experiences equal forces from the tension springs on both sides, tending to remain stationary and not affecting the normal operation of the auxiliary boom. The two tension springs 7 are located on the front and rear sides of the roller mounting base 2, respectively.

[0040] like Figure 2 As shown, when the auxiliary arm is folded back, so that the roller contacts the inclined section of the auxiliary arm bracket 10, if the first roller 3 is in front of the second roller 4, the first roller 3 contacts the inclined section 101 first, the roller mounting seat 2 rotates clockwise around the first axis, the tension spring 7 on one side of the first roller 3 is compressed, the tension spring 7 on one side of the second roller 4 is extended, the height of the second roller 4 is reduced, and it also contacts the inclined section 101, so that both rollers can roll on the inclined section 101.

[0041] like Figure 3 As shown, when the roller climbs over the inclined section 101 and enters the horizontal straight section 102 of the auxiliary boom bracket 10, the roller mounting seat 2 rotates counterclockwise around the first axis. The tension spring 7 on the side of the first roller 3 is extended, and the tension spring 7 on the side of the second roller 4 is compressed, so that the first roller 3 and the second roller 4 are still on the auxiliary boom bracket 10.

[0042] like Figure 1 As shown, optionally, the two tension springs 7 are arranged symmetrically, and the distance between the two tension springs 7 gradually decreases from the end near the connecting beam 1 towards the roller mounting seat 2.

[0043] In this embodiment, the two tension springs 7 are symmetrically arranged about the roller mounting base 2. One tension spring 7 applies a forward and upward tension force to the roller mounting base 2, and the other tension spring 7 applies a backward and upward tension force to the roller mounting base 2, resulting in good shock absorption and buffering effect and excellent stability.

[0044] like Figure 1 As shown, optionally, the folding arm auxiliary retraction device further includes a fixed shaft 8, which is mounted on the connecting beam 1, and the tension spring 7 is connected to the fixed shaft 8.

[0045] In this embodiment, the fixed shaft 8 provides the mounting connection point for the tension spring 7, and the front and rear sides of the roller mounting base 2 can extend out ears. One end of the tension spring 7 is connected to the ears, and the other end is connected to the fixed shaft 8. The connection method is simple.

[0046] like Figure 1 As shown, optionally, the roller mounting base 2 is provided with a pull rod hole 21, the pull rod hole 21 is used to connect the pull rod 11, and the auxiliary arm bracket 10 has an inclined section 101. When the height of the first roller 3 and the second roller 4 is lower than the height of the inclined section 101, the pull rod 11 is used to drive the roller mounting base 2 to rotate relative to the connecting beam 1 so that the first roller 3 or the second roller 4 contacts the inclined section 101.

[0047] In this embodiment, a vertical through-hole 21 can be provided on the support plate of the roller mounting base 2. The pull rod 11 is inserted into the pull rod hole and fixed thereto. Pulling the pull rod 11 can push the roller mounting base 2 to swing back and forth around the first axis L1.

[0048] It should be noted that, theoretically, at least one roller should contact the inclined section 101 of the auxiliary boom bracket 10 first when the auxiliary boom is folded and retracted. However, in actual operation, due to operational errors or mechanical wear and other factors, the height of both rollers may be lower than the inclined section 101 of the auxiliary boom bracket 10 when the auxiliary boom is folded and retracted. Figure 4 As shown, the operator can stand on the ground and pull the lever 11 to manually rotate the roller mounting base 2, raising the first roller 3 to contact the inclined section 101. The first roller 3 rolls along the inclined section, and both rollers enter the auxiliary arm bracket, completing the retraction operation. In this embodiment, the roller height can be manually adjusted via the lever 11, further improving the obstacle-crossing capability.

[0049] Another embodiment of the present invention provides a folding boom assembly, including a boom, a boom bracket 10, and the aforementioned folding boom auxiliary retraction and deployment device. The boom includes a truss arm 9, and the connecting beam 1 of the folding boom auxiliary retraction and deployment device is connected to the truss arm 9. The boom is retracted onto the boom bracket 10 via the folding boom auxiliary retraction and deployment device. In this embodiment, the advantages of the folding boom assembly compared to the prior art are the same as those of the aforementioned folding boom auxiliary retraction and deployment device, and will not be repeated.

[0050] Another embodiment of the present invention provides a crane including the aforementioned folding boom assembly and main boom, wherein the boom support of the folding boom assembly is mounted on the main boom. In this embodiment, the advantages of the crane compared to the prior art are the same as those of the aforementioned folding boom assembly, and will not be repeated.

[0051] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A folding sub-arm assisted stowing and deploying device, characterized in that, The device comprises a connecting beam (1), a roller mounting base (2), a first roller (3) and a second roller (4), the connecting beam (1) is used for connecting with a truss arm (9) of a sub-arm, one end of the roller mounting base (2) is rotatably connected with the connecting beam (1), the other end of the roller mounting base (2) is connected with the first roller (3) and the second roller (4) respectively on both sides in the rotating direction, the first roller (3) and the second roller (4) are used for rolling along a sub-arm bracket (10); further comprising a buffer mechanism, the buffer mechanism is arranged between the connecting beam (1) and the roller mounting base (2); the buffer mechanism is a tension spring (7), the roller mounting base (2) is connected with both ends of the connecting beam (1) through corresponding tension springs (7) respectively on both sides in the rotating direction; when the roller mounting base (2) rotates relative to the connecting beam (1), one of the two tension springs (7) is elongated, and the other tension spring (7) is shortened; the two tension springs (7) are symmetrically arranged, and the distance between the two tension springs (7) gradually decreases from the end close to the connecting beam (1) to the direction close to the roller mounting base (2).

2. The folding auxiliary arm assisted deployment device of claim 1, wherein, Further comprising a first pin shaft (5), one end of the roller mounting base (2) is rotatably connected with the connecting beam (1) through the first pin shaft (5).

3. The folding auxiliary arm assisted deployment device of claim 2, wherein, Further comprising a second pin shaft (6), the first roller (3) and the second roller (4) are connected with the roller mounting base (2) through corresponding second pin shafts (6) respectively, the axis direction of the second pin shaft (6) is parallel to the axis direction of the first pin shaft (5).

4. The folding auxiliary arm assist deployment device of claim 1, wherein, Further comprising a fixed shaft (8), the fixed shaft (8) is installed on the connecting beam (1), and the tension spring (7) is connected with the fixed shaft (8).

5. The folding auxiliary arm assist deployment device of claim 1, wherein, The roller mounting base (2) is provided with a pull rod hole (21), the pull rod hole (21) is used for connecting a pull rod (11), the sub-arm bracket (10) has a slope section (101), when the height of the first roller (3) and the second roller (4) is lower than the height of the slope section (101), the pull rod (11) is used for driving the roller mounting base (2) to rotate relative to the connecting beam (1), so that the first roller (3) or the second roller (4) is in contact with the slope section (101).

6. A folding jib assembly comprising: The device comprises a sub-arm, a sub-arm bracket (10) and the folding sub-arm auxiliary folding and unfolding device as claimed in any one of claims 1-5, the sub-arm comprises a truss arm (9), the connecting beam (1) of the folding sub-arm auxiliary folding and unfolding device is connected with the truss arm (9), and the sub-arm is folded on the sub-arm bracket (10) through the folding sub-arm auxiliary folding and unfolding device.

7. A crane, characterized in that The device comprises the folding sub-arm assembly as claimed in claim 6 and a main arm, and the sub-arm bracket (10) of the folding sub-arm assembly is arranged on the main arm.

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