Tower crane A-frame and jib tower crane

Abstract

The utility model discloses a tower crane A frame and movable arm tower crane, tower crane A frame includes front bracing piece, diagonal bracing piece and rear bracing piece, and the upper end of diagonal bracing piece is hinged with front bracing piece through first mounting pin, and the lower end is equipped with the second pin mounting hole for the second mounting pin to pass through, and the rear bracing piece is equipped with the support lug plate of facing second pin mounting hole setting, and the support lug plate is equipped with the support opening of the second mounting pin through and position adjustment, and the bottom wall of support opening is equipped with the support arc section of concave setting and the line support of second mounting pin, can realize the stable installation of diagonal bracing piece, in addition, the diagonal bracing piece of different length has different support positions on the support arc section, and then makes not need to be equipped with stud bolt and adjusting nut, reaches the purpose of reducing production cost and improving dismounting efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of luffing jib tower cranes, and particularly relates to an A-frame tower crane and a luffing jib tower crane. Background Technology

[0002] The A-frame of a tower crane is a crucial component of a luffing tower crane, playing a vital role in the crane's luffing motion. The A-frame includes the front strut frame, rear strut frame, diagonal braces, and shock absorbers. When the entire shock absorber bears the impact pressure, the diagonal braces effectively support the front struts, absorbing the impact pressure from the shock absorber.

[0003] The existing diagonal brace has its upper and lower ends hinged to the lugs on the front and rear braces respectively via pins. Furthermore, due to manufacturing and cost factors, such as... Figure 1 As shown, it is difficult to ensure that the straight-line distance between the pin holes on the ear plates of the front and rear support rods is equal to the straight-line distance between the pin holes at both ends of the diagonal support rod. Therefore, the diagonal support rod is equipped with a double-ended screw 01 and an adjusting nut 02. By adjusting the length of the double-ended screw 01 added to the diagonal support rod, the two ends of the diagonal support rod can be hinged to the ear plates on the front and rear support rods respectively. However, the addition of the double-ended screw 01 and the adjusting nut 02 leads to higher production costs and lower assembly / disassembly efficiency. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, this utility model provides a tower crane A-frame and luffing jib tower crane, which aims to solve the technical problems of high production cost and low disassembly and assembly efficiency caused by the addition of double-headed screws and adjusting nuts in the diagonal bracing.

[0005] To achieve the above objectives, the first aspect of this utility model provides an A-frame for a tower crane, wherein the A-frame includes a front support rod, a diagonal support rod, and a rear support rod; the upper end of the diagonal support rod is hinged to the front support rod via a first mounting pin, and the lower end is provided with a second pin mounting hole for a second mounting pin to pass through; the rear support rod is provided with a support lug plate facing the second pin mounting hole, the support lug plate is provided with a support opening for the second mounting pin to pass through and for position adjustment, and the bottom wall of the support opening is provided as a recessed support arc segment that provides linear support for the second mounting pin.

[0006] In one embodiment of the present invention, the support opening has an upwardly facing opening, and the inner wall of the support opening further includes a first opening segment and a second opening segment disposed at opposite ends of the support arc segment, and the first opening segment and the second opening segment are spaced apart to form an opening.

[0007] In one embodiment of this utility model, the first opening segment and the second opening segment are both straight segments, and the first opening segment and the second opening segment are tangentially connected to the supporting arc segment and are gradually moved away from each other in the upward extending direction.

[0008] In one embodiment of this utility model, the included angle between the two line segments is less than 60°; and / or the included angle between the two line segments is set to a range of 30° to 45°.

[0009] In one embodiment of the present invention, the first opening segment and / or the second opening segment are provided with a chamfer at the connection with the outer contour of the supporting ear plate.

[0010] In one embodiment of this utility model, the radius of the supporting arc segment is set to a range of (0.75d~d), where d represents the diameter of the second mounting pin; and / or, the central angle of the supporting arc segment is set to a range of 120°~150°.

[0011] In one embodiment of this utility model, the upper end of the diagonal brace is provided with a first pin hole for the first mounting pin to pass through, the lower end of the rear brace is provided with a third pin hole, and the center of the circumference of the supporting arc segment is located on the line connecting the centers of the first pin hole and the third pin hole.

[0012] In one embodiment of this utility model, the support opening is arranged symmetrically with the line connecting the centers of the first pin hole and the third pin hole as the axis of symmetry.

[0013] In one embodiment of this utility model, there are two support ear plates on the rear support rod, and the two support ear plates are arranged at intervals relative to each other on the rear support rod, with the lower end of the diagonal support rod placed between the two support ear plates.

[0014] To achieve the above objectives, a second aspect of this utility model provides a luffing jib tower crane, wherein the luffing jib tower crane includes the tower crane A-frame as described above.

[0015] Through the above technical solution, the tower crane A-frame provided by this utility model has the following beneficial effects: When the luffing jib tower crane uses the aforementioned A-frame, the support ear plate of the rear strut has a support opening. The bottom wall of the support opening is a recessed support arc segment. The lower end of the diagonal strut can be placed on one side of the support ear plate, and the second mounting pin, which passes through the lower end of the diagonal strut, passes through the support opening. The support opening allows for position adjustment of the second mounting pin, and the support arc segment provides linear support for the second mounting pin. Thus, the position of the second mounting pin can be adjusted within the support opening until it abuts against the support arc segment to find the support position. At this point, the inclined diagonal strut can press the second mounting pin tightly against the support arc segment, thereby achieving stable installation of the diagonal strut. In addition, diagonal struts of different lengths have different support positions on the support arc segment, thus eliminating the need for double-ended screws and adjusting nuts, achieving the purpose of reducing production costs and improving assembly and disassembly efficiency.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the connection between the diagonal brace and the rear brace in the background art. Figure 2 This is a structural schematic diagram of the A-frame of a tower crane according to one embodiment of the present invention; Figure 3 yes Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the supporting ear plate according to one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 100, Front support rod; 200, Diagonal support rod; 210, Second mounting pin; 300, Rear support rod; 310, Support ear plate; 311, Support arc segment; 312, First opening segment; 313, Second opening segment; 320, Support opening; 330, Third pin mounting hole. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0020] The following description of the tower crane A-frame and luffing jib tower crane of this utility model is based on the accompanying drawings.

[0021] like Figure 2 and Figure 3 As shown, this utility model provides an A-frame for a tower crane, wherein the A-frame includes: Front strut 100; The diagonal brace 200 has its upper end hinged to the front brace 100 via a first mounting pin, and its lower end has a second mounting hole for the second mounting pin 210 to pass through. The rear support rod 300 has a support ear plate 310 facing the second mounting hole. The support ear plate 310 has a support opening 320 for the second mounting pin 210 to pass through and for position adjustment. The bottom wall of the support opening 320 is a recessed support arc segment 311 that provides line support for the second mounting pin 210.

[0022] When the luffing jib tower crane uses the aforementioned tower crane A-frame, because the support lug 310 of the rear strut 300 is provided with a support opening 320, and the bottom wall of the support opening 320 is a recessed support arc segment 311, the lower end of the diagonal strut 200 can be placed on one side of the support lug 310, and the second mounting pin 210, which passes through the lower end of the diagonal strut 200, passes through the support opening 320. The support opening 320 allows the second mounting pin 210 to be adjusted in position, and the support arc segment 311 can provide linear support for the second mounting pin 210, thereby allowing the lower end of the diagonal strut 200 to be placed on one side of the support lug 310. The second mounting pin 210 is adjusted within the support opening 320 until it abuts against the support arc segment 311 to find the support position. At this time, the inclined brace 200 can press the second mounting pin 210 against the support arc segment 311, thereby achieving stable installation of the brace 200. In addition, braces 200 of different lengths have different support positions on the support arc segment 311, thus eliminating the need for double-ended screws and adjusting nuts, thereby reducing production costs and improving disassembly and assembly efficiency.

[0023] Specifically, in the prior art, the connection between the rear support rod 300 and the diagonal support rod 200 is hinged. The pin hole of the ear plate of the rear support rod 300 and the pin hole at the lower end of the diagonal support rod 200 are the same size and shape and need to be aligned to allow the hinge pin to pass through. Therefore, the installation position requires high precision. In this utility model, the support opening 320 on the support ear plate 310 of the rear support rod 300 is different from the pin hole in the prior art. Of course, this difference is not necessarily in shape. The support opening 320 can also be set as a circular hole with the same shape as the pin hole. However, the radius of the circular hole of the support opening 320 needs to be set to be larger than the radius of the second mounting pin 210. That is, the difference between the two is in size, so that the inner wall of the lower half of the circular hole becomes the supporting arc segment 311. The second mounting pin 210 can be adjusted in position within the circular hole of the support opening 320. The final effect is to clamp the second mounting pin 210 between the diagonal support rod 200 and the arc segment, which is different from the hinge method in the prior art.

[0024] More specifically, the supporting arc segment 311 is designed to provide line support for the second mounting pin 210, which implicitly discloses that the radius of the circumference of the supporting arc segment 311 should be greater than the radius of the second mounting pin 210.

[0025] See Figures 2 to 4In one embodiment of this utility model, the support opening 320 has an upward-facing opening. The inner wall of the support opening 320 also includes a first opening segment 312 and a second opening segment 313 respectively disposed at opposite ends of the support arc segment 311, and the first opening segment 312 and the second opening segment 313 are spaced apart to form an opening. By opening the support opening 320, when installing the lower end of the diagonal brace 200 onto the rear brace 300, the second mounting pin 210 can be first inserted into the diagonal brace 200, and then the second mounting pin 210 can be inserted into the support opening 320 from the opening. This is significantly more convenient than first placing the lower end of the diagonal brace 200 on one side of the support ear plate 310, and then sequentially inserting the second mounting pin 210 into the second pin hole and the support opening 320. Meanwhile, the addition of the first opening segment 312 and the second opening segment 313 can limit the second mounting pin 210 from both sides, deepen the support opening 320, and prevent the second mounting pin 210 from accidentally coming out of the support opening 320. Of course, this utility model is not limited to this; the support opening 320 can also be circumferentially fully enclosed.

[0026] In one embodiment of this utility model, the first opening segment 312 and the second opening segment 313 are both straight segments, and the first opening segment 312 and the second opening segment 313 are tangentially connected to the supporting arc segment 311 and are gradually separated from each other in the upward extending direction. Setting the first opening segment 312 and the second opening segment 313 to be tangentially connected to the supporting arc segment 311 allows for a smooth transition at the joint. In addition, the first opening segment 312 and the second opening segment 313 are gradually separated from each other in the upward extending direction, that is, the opening is flared from bottom to top, which is easy to process and can guide the entry and exit of the second mounting pin 210.

[0027] In one embodiment of this utility model, the included angle between the two straight segments of the first opening segment 312 and the second opening segment 313 is set to an acute angle, thereby obtaining an obtuse angle for the central angle of the supporting arc segment 311, which serves to ensure the arc length of the supporting arc segment 311. Specifically, the included angle between the two straight segments is less than 60°. Based on the fact that the first opening segment 312 and the second opening segment 313 are tangentially connected to the supporting arc segment 311 and the opening is designed to widen from bottom to top, the central angle of the supporting arc segment 311 can be limited to the range of 120°~180°. Preferably, the included angle between the two straight segments is set to a range of 30°~45°, which can limit the central angle of the supporting arc segment 311 to the range of 135°~150°, so as to ensure the strength of the supporting ear plate 310 while meeting the position adjustment requirements of the diagonal brace 200, and avoid the supporting opening 320 occupying too much space on the supporting ear plate 310.

[0028] In one embodiment of this utility model, the first opening segment 312 and / or the second opening segment 313 are provided with chamfers at the connection points with the outer contours of the supporting ear plate 310. The addition of chamfers avoids the appearance of sharp points. Specifically, the chamfers are preferably rounded chamfers.

[0029] In one embodiment of this utility model, the radius of the supporting arc segment 311 is set to a range of (0.75d~d), where d represents the diameter of the second mounting pin 210. By limiting the radius of the supporting arc segment 311, the supporting arc segment 311 can have a curvature more suitable for support, and the support position on the supporting arc segment 311 for supporting the second mounting pin 210 can form a certain adjustment range to accommodate the installation of diagonal braces 200 of different lengths.

[0030] In one embodiment of this utility model, the central angle of the supporting arc segment 311 is set to a range of 120°~150°, so as to ensure the strength of the supporting ear plate 310 while meeting the position adjustment requirements of the diagonal brace 200, and to avoid the supporting opening 320 occupying too much space on the supporting ear plate 310.

[0031] In one embodiment of this utility model, the upper end of the diagonal brace 200 is provided with a first mounting hole for the first mounting pin to pass through, and the lower end of the rear brace 300 is provided with a third mounting hole 330. The center of the circumference of the supporting arc segment 311 is located on the line connecting the centers of the first mounting hole and the third mounting hole 330. This arrangement facilitates determining the installation height of the supporting ear plate 310 on the rear brace 300, and by placing the center of the circumference of the supporting arc segment 311 on the line connecting the centers of the first mounting hole and the third mounting hole 330, the attachment bending moment generated on the rear brace 300 can be eliminated when the diagonal brace 200 is under stress. Furthermore, the supporting opening 320 is axially symmetrical about the line connecting the centers of the first mounting hole and the third mounting hole 330. The position of the supporting arc segment 311 on the line connecting the centers of the aforementioned circles is the midpoint of the supporting arc segment 311, and the supporting arc segments 311 on both sides of the midpoint can be adjusted in the positive and negative directions respectively, so that the corresponding direction can be quickly selected for adjustment during installation.

[0032] In one embodiment of this utility model, the rear support rod 300 has two support ear plates 310, which are arranged at intervals relative to each other on the rear support rod 300. The lower end of the diagonal support rod 200 is positioned between the two support ear plates 310. That is, there are two supporting arc segments 311 that support the second mounting pin 210 and simultaneously press the second mounting pin 210 against the diagonal support rod 200, further ensuring the reliability of the installation.

[0033] Therefore, the tower crane A-frame provided by this utility model has the following advantages compared with the prior art: 1. Eliminating the need for additional double-ended screws and adjusting nuts effectively reduces costs; 2. No length adjustment is required, and the installation process is simple and convenient; 3. The diagonal brace 200 is set as a single rod, eliminating one rod, making the structure simpler and further reducing manufacturing costs.

[0034] Furthermore, this utility model also provides a luffing jib tower crane, wherein the luffing jib tower crane includes the A-frame of the tower crane as described above. Since the luffing jib tower crane adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0035] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A tower crane A-frame, characterized in that, include: Front strut (100); The diagonal brace (200) has its upper end hinged to the front brace (100) via a first mounting pin, and its lower end is provided with a second mounting hole for the second mounting pin (210) to pass through. The rear support rod (300) is provided with a support ear plate (310) facing the second mounting hole. The support ear plate (310) is provided with a support opening (320) for the second mounting pin (210) to pass through and for position adjustment. The bottom wall of the support opening (320) is provided with a recessed support arc segment (311) for line support of the second mounting pin (210).

2. The tower crane A-frame according to claim 1, characterized in that, The support opening (320) has an upward-facing opening. The inner wall of the support opening (320) also includes a first opening segment (312) and a second opening segment (313) located at opposite ends of the support arc segment (311), and the first opening segment (312) and the second opening segment (313) are spaced apart to form the opening.

3. The tower crane A-frame according to claim 2, characterized in that, The first opening segment (312) and the second opening segment (313) are both straight segments, and the first opening segment (312) and the second opening segment (313) are tangentially connected to the supporting arc segment (311) and are gradually moved away from each other in the upward direction.

4. The tower crane A-frame according to claim 3, characterized in that, The included angle between the two line segments is less than 60°; and / or, the included angle between the two line segments is set to a range of 30° to 45°.

5. The tower crane A-frame according to claim 2, characterized in that, The first opening segment (312) and / or the second opening segment (313) are chamfered at the connection with the outer contour of the support ear plate (310).

6. The tower crane A-frame according to any one of claims 1 to 5, characterized in that, The radius of the supporting arc segment (311) is set to a range of (0.75d~d), where d represents the diameter of the second mounting pin (210); And / or, the central angle of the supporting arc segment (311) is set to a range of 120°~150°.

7. The tower crane A-frame according to any one of claims 1 to 5, characterized in that, The upper end of the diagonal brace (200) is provided with a first pin hole for the first mounting pin to pass through, and the lower end of the rear brace (300) is provided with a third pin hole (330). The center of the circumference of the supporting arc segment (311) is located on the line connecting the center of the first pin hole and the center of the third pin hole (330).

8. The tower crane A-frame according to claim 7, characterized in that, The support opening (320) is symmetrically arranged with the line connecting the centers of the first pin hole and the third pin hole (330) as the axis of symmetry.

9. The tower crane A-frame according to any one of claims 1 to 5, characterized in that, The rear support rod (300) has two support ear plates (310), which are arranged at intervals relative to each other on the rear support rod (300), and the lower end of the diagonal support rod (200) is placed between the two support ear plates (310).

10. A luffing jib tower crane, characterized in that, The luffing tower crane includes the tower crane A-frame as described in any one of claims 1 to 9.

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