Self-balancing and self-synchronizing mechanical bivalve grab bucket

Abstract

The self-balancing and self-synchronizing mechanical double-petal grab bucket comprises an upper bearing beam, a lower bearing beam, supporting rods, a bucket body and a lifting chain, an upper pulley block is arranged on the upper bearing beam, the lower ends of the two pairs of supporting rods are hinged to two bucket petals of the bucket body respectively, and the upper bearing beam, the upper pulley block and the upper ends of the two pairs of supporting rods are hinged to one another in the mode that a same hinge shaft penetrates through the upper bearing beam, the upper pulley block and the upper ends of the two pairs of supporting rods; the pair of lifting chains is connected to the two sides of the upper bearing beam respectively. The upper pulley block, the upper hinge point of the supporting rod and the upper bearing beam share the same hinge shaft, the effect that the upper bearing beam swings to compensate lifting unbalance loading can be achieved, and therefore an original balancing frame structure is omitted. A single side is changed into a four-hinge-point structure, opening and closing of the supporting rods have no synchronous requirement, automatic balance is achieved under the action of gravity, and the bucket body is opened and closed smoothly.

Description

Technical Field

[0001] This invention relates to the field of grabs, and more particularly to a self-balancing and self-synchronizing mechanical double-lobed grab. Background Technology

[0002] Please see Figures 1-5 As shown, the main structure of the existing mechanical double-lobed grab bucket includes: an upper support beam 1, a lower support beam 2, support rods 3, and a bucket body 4. The upper and lower ends of the two support rods 3 on the same side are hinged to the upper and lower support beams 2, respectively. Including the hinges at the upper ends of the two lobes of the bucket body 4, there are a total of five hinge points on one side (i.e., Figure 2 (at points a, b, c, d, and e in the text). Please refer to... Figure 2 As shown, a total of ten hinge points are symmetrically arranged on both sides of the grab bucket to form a closed linkage mechanism. The opening and closing of the bucket body 4 is achieved by the relative displacement of the upper and lower support beams 1 and 2. A balance frame 5 is also hinged above the upper support beam 1, and a pair of lifting chains 6 are connected to the balance frame 5. The balance frame 5 compensates for the uneven load caused by the asynchronous lifting of the lifting chains 6 by small swings. An upper pulley group 7 is also provided in the upper support beam 1, and a lower pulley group 8 and a balance wedge sleeve 9 are provided on the lower support beam 2. The balance wedge sleeve 9 itself is in a two-section hinged shape, and the end of the balance wedge sleeve 9 passes through the lower pulley group 8 through the same hinge axis and is set on the lower support beam 2. The balance wedge sleeve 9 can rotate around the two hinge points (i.e. Figure 2 The opening and closing cable 10 oscillates at points f and g. The opening and closing cable 10 passes through the balance wedge sleeve 9 and is wound around the upper and lower pulley sets 7 and 8. The small oscillation of the balance wedge sleeve 9 compensates for the uneven load caused by the asynchronous lifting of the opening and closing cable 10. Additionally, synchronizing teeth 11 are provided at the upper ends of the two support rods 3 on the same side. The meshing of these teeth prevents the support rods 3 from opening and closing asynchronously.

[0003] Currently, there are several problems with the above structure during use and maintenance: 1. During the use of the grab bucket, the lifting mechanism of the crane cannot maintain perfect real-time synchronization. The grab bucket must be equipped with multiple balance compensation mechanisms to deal with this problem, which makes the structure too complicated.

[0004] 2. During the use of the grab bucket, the strut synchronous gear is often subjected to the impact caused by off-center load and grab bucket swing, which causes it to wear out faster and has a significantly shorter service life than other parts. It also causes the strut to bear additional loads frequently. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a self-balancing and self-synchronizing mechanical double-lobed grab bucket, which simplifies the structure and effectively improves efficiency and service life.

[0006] A self-balancing and self-synchronizing mechanical double-lobed grab bucket includes an upper support beam, a lower support beam, support rods, a bucket body, and lifting chains. The upper support beam is equipped with an upper pulley assembly, and the lower ends of the two pairs of support rods are respectively hinged to the two lobes of the bucket body. The upper support beam, the upper pulley assembly, and the upper ends of the two pairs of support rods are hinged to each other through the same hinge shaft, and a pair of lifting chains are respectively connected to both sides of the upper support beam.

[0007] The upper ends of both pairs of support rods are provided with shaft holes, and they are fitted onto the same side of the hinge shaft in pairs.

[0008] The two ends of the hinge shaft also have protective covers.

[0009] The self-balancing and self-synchronizing mechanical double-lobed grab bucket of the present invention has the following advantages: 1. The upper pulley block, the upper hinge point of the strut, and the upper bearing beam share a common hinge shaft, which can realize the function of the upper bearing beam swinging to compensate for the lifting eccentric load, thus eliminating the original balance frame structure.

[0010] 2. The single-sided structure was changed to a four-hinge structure. The opening and closing of the struts no longer require synchronization. Under the action of gravity, it automatically balances and the bucket opens and closes smoothly.

[0011] 3. The original synchronous gear structure on the strut has been eliminated, so the strut will not bear additional impact loads, the structural strength can be greatly improved, and there is no wear of the synchronous gear.

[0012] 4. Due to the reduction in the number of parts, the weight of the grab bucket can be reduced, the bucket capacity can be increased accordingly, and the grabbing efficiency can also be improved. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of a mechanical double-lobed grab bucket based on existing technology; Figure 2 This is a front view of a conventional mechanical double-lobed grab bucket; Figure 3 This is a side view of a conventional mechanical double-lobed grab bucket; Figure 4 yes Figure 2 A cross-sectional view of the hinge point on one of the struts (along the AA direction); Figure 5 yes Figure 2 Enlarged schematic diagram of part F in the diagram; Figure 6 This is a three-dimensional schematic diagram of the mechanical double-lobed grab bucket of the present invention; Figure 7 This is a front view of the mechanical double-lobed grab bucket of the present invention; Figure 8 This is a side view of the mechanical double-lobed grab bucket of the present invention; Figure 9 yes Figure 7 A cross-sectional view of the hinge point on the two struts (along the BB direction); Figure 10 yes Figure 7 Enlarged schematic diagram of part A in the diagram. Detailed Implementation

[0014] The following is a further description of a self-balancing and self-synchronizing mechanical double-lobed grab bucket according to the present invention.

[0015] like Figures 6-10 As shown, the self-balancing and self-synchronizing mechanical double-lobed grab bucket of the present invention is similar to the prior art in that it also includes an upper support beam 1, a lower support beam 2, support rods 3, a bucket body 4, lifting chains 6, and an opening and closing cable 10. The upper support beam 1 is equipped with an upper pulley assembly 7. The lower ends of the two pairs of support rods 3 are respectively hinged to the two lobes of the bucket body 4. The lower support beam 2 is equipped with a lower pulley assembly 8 and a balance wedge sleeve 9. The opening and closing cable 10 passes through the balance wedge sleeve 9 and wraps around the upper pulley assembly 7 and the lower pulley assembly 8. Unlike the prior art, in the present invention, the upper support beam 1, the upper pulley assembly 7, and the upper ends of the two pairs of support rods 3 are hinged together by the same hinge shaft 12. Furthermore, a pair of lifting chains 6 are respectively connected to both sides of the upper support beam 1. The specific structure is as follows... Figures 8-9 As shown: The hinge shaft 12 passes through the middle of the upper support beam 1 and also passes through the upper pulley block 7. The upper ends of both pairs of support rods 3 are provided with shaft holes, and they are fitted onto the same side end of the hinge shaft 12 in pairs. Thus, the linkage mechanism composed of the upper support beam 1, lower support beam 2, support rods 3, and bucket body 4 has only four hinge points on one side (i.e., Figure 7 (Eight hinge points are symmetrically arranged on both sides at points a, b, c, and d). Compared to existing technologies, one hinge point is reduced on each side. Furthermore, the balance frame and synchronization gear structure of existing technologies are eliminated.

[0016] Thus, the upper pulley, the upper hinge point of the support rod 3, and the upper bearing beam 1 share a single hinge shaft 12, enabling the upper bearing beam 1 to swing slightly (e.g., Figure 7 (As shown by the curved arrow in the image) to compensate for the uneven load caused by the asynchronous lifting of the lifting chain 6. The overall four-hinged structure means that the opening and closing of the support rod 3 does not require synchronization. Under the action of gravity, it automatically balances, and the bucket 4 opens and closes smoothly. There are no synchronous teeth on the support rod 3, so the support rod 3 will not bear additional impact loads, the structural strength can be greatly improved, and there is no wear of synchronous teeth.

[0017] In addition, protective covers 13 are provided at both ends of the hinge shaft 12. The inner side of the protective cover 13 is connected to the outer wall of the upper bearing beam 1 on the same side, which can play a good protective role.

[0018] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Any changes or modifications to the above embodiments that are within the essential spirit of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A self-balancing and self-synchronizing mechanical double-lobed grab bucket, comprising an upper support beam, a lower support beam, support rods, a bucket body, and a lifting chain, wherein the upper support beam is provided with an upper pulley assembly, and the lower ends of the two pairs of support rods are respectively hinged to the two lobes of the bucket body, characterized in that: The upper support beam, the upper pulley block, and the upper ends of the two pairs of support rods are hinged to each other through the same hinge shaft, and a pair of lifting chains are respectively connected to both sides of the upper support beam.

2. The self-balancing and self-synchronizing mechanical double-lobed grab bucket as described in claim 1, characterized in that: The upper ends of both pairs of support rods are provided with shaft holes, and they are fitted onto the same side of the hinge shaft in pairs.

3. A self-balancing and self-synchronizing mechanical double-lobed grab bucket as described in claim 1 or 2, characterized in that: The two ends of the hinge shaft also have protective covers.

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