Inclined supporting rod for A-shaped frame of luffing jib tower crane

Abstract

The utility model discloses a movable arm tower crane A-shaped frame inclined supporting rod, which comprises a long supporting rod, a short supporting rod, an adjusting bolt, a locking nut and a pin shaft, the adjusting bolt is a double-end stud, two threaded sections of the adjusting bolt are opposite in screwing direction, one end of the adjusting bolt is in threaded connection with the long supporting rod, and the other end of the adjusting bolt is in threaded connection with the short supporting rod. A locking nut is further arranged on threads, connected with the long supporting rod or the short supporting rod, of the adjusting bolt, the long supporting rod is longer than the short supporting rod, the long supporting rod comprises a rod body, a long rod lug plate, a connecting plate, a flitch plate and a long rod threaded connector, one end of the rod body is connected with one end of the flitch plate, and the other end of the flitch plate is fixedly connected with the long rod threaded connector. The long supporting rod comprises a long rod threaded connector and a short rod lug plate, the long rod threaded connector is in threaded connection with one end of the adjusting bolt, the other end of the rod body is connected with the connecting plate, the connecting plate is connected with the long rod lug plate, the short supporting rod comprises a short rod threaded connector and a short rod lug plate, the short rod threaded connector is connected with the short rod lug plate, and the short rod threaded connector is in threaded connection with the other end of the bolt. The length is adjustable and the installation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of luffing tower crane, especially relates to a luffing tower crane A frame inclined strut. BACKGROUND

[0002] A frame is an important component of luffing tower crane, generally comprises front strut, rear strut and inclined strut, and the two ends of the inclined strut are connected with the front strut and the rear strut respectively to form a stable triangular structure installed on the balance arm.

[0003] There are two structural forms of the A frame inclined strut of the luffing tower crane in the market: one is fixed in length and cannot be adjusted, and it is difficult to install and has high precision requirement; the other one has no inclined strut, and the strength of the front strut needs to be increased to resist the back tilting force of the crane arm, which increases the cost and causes certain resource waste. SUMMARY

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a luffing tower crane A frame inclined strut, which is adjustable in length and easy to install.

[0005] To achieve the above object, the utility model adopts the following technical scheme: a luffing tower crane A frame inclined strut, comprising a long strut, a short strut, an adjusting bolt, and a locking nut, the adjusting bolt is a double-headed stud, the two threaded sections are opposite in rotation direction, one end is screwed with the long strut, the other end is screwed with the short strut, and the locking nut is arranged on the thread of the adjusting bolt and the long strut or the short strut, the length of the long strut is greater than that of the short strut, the long strut comprises a rod body, a long rod ear plate, a connecting plate, a pad, and a long rod threaded joint, one end of the rod body is connected with one end of the pad, the other end of the pad is fixedly connected with the long rod threaded joint, the long rod threaded joint is screwed with one end of the adjusting bolt, the other end of the rod body is connected with the connecting plate, and the connecting plate is connected with the long rod ear plate, the short strut comprises a short rod threaded joint and a short rod ear plate, the short rod threaded joint is connected with the short rod ear plate, and the short rod threaded joint is screwed with the other end of the adjusting bolt.

[0006] In the above technical scheme, an end face of the connecting end of the rod body and the pad is provided with an end plate.

[0007] In the above technical scheme, a circular pad for increasing strength is arranged on the short rod ear plate.

[0008] In the above technical scheme, a pin shaft is arranged at the two ends of the adjusting bolt.

[0009] In the above technical scheme, a plurality of through holes are arranged at the middle position of the adjusting bolt.

[0010] In the above technical solution, the rod is a square tube.

[0011] The beneficial effects of this utility model are: the A-frame diagonal brace has a simple structure, low cost, adjustable length, easy installation, and achieves the best effect when the entire A-frame bears the backward tilting force of the crane arm. Attached Figure Description

[0012] Figure 1 This is a schematic diagram illustrating the use of this utility model.

[0013] Figure 2 This is a schematic diagram of the structure of this utility model.

[0014] Figure 3 for Figure 2 Enlarged view of part of the structure.

[0015] Figure 4 This is a new sectional view for this utility model.

[0016] The components are: 1. Long support rod, 2. Short support rod, 3. Adjusting bolt, 4. Left-hand lock nut, 5. Right-hand lock nut, 6. Pin, 7. Long rod ear plate, 8. Connecting plate, 9. Rod body, 10. Sealing plate, 11. Adhesive plate, 12. Long rod threaded joint, 13. Short rod ear plate, 14. Round adhesive plate, 15. Short rod threaded joint. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 1 to 4 The diagram shows an A-frame diagonal brace for a luffing jib tower crane, comprising a long brace 1, a short brace 2, an adjusting bolt 3, and a locking nut. The adjusting bolt 3 is a double-ended stud with opposite thread directions at both ends. One end is screwed to the long brace 1, and the other end is screwed to the short brace 2. A left-handed locking nut 4 is provided on the thread connecting the adjusting bolt 3 to the long brace 1, and a right-handed locking nut 5 is provided on the thread connecting the adjusting bolt 3 to the short brace 2. The length of the long brace 1 is greater than the length of the short brace 2. The long brace 1 includes a rod body 9, a long rod lug 7, a connecting plate 8, a mounting plate 11, and long rod threads. The connector 12, one end of the rod 9 is connected to one end of the plate 11, and the other end of the plate 11 is fixedly connected to the long rod threaded connector 12. The long rod threaded connector 12 is screwed to one end of the adjusting bolt 3, and the left-hand lock nut 4 is connected to the threaded section. The other end of the rod 9 is connected to the connecting plate 8, and the connecting plate 8 is connected to the long rod ear plate 7. The short support rod 2 includes a short rod threaded connector 15 and a short rod ear plate 13. The short rod threaded connector 15 is connected to the short rod ear plate 13, and the short rod threaded connector 15 is screwed to the other end of the aforementioned bolt. The right-hand lock nut 5 is connected to the threaded section.

[0019] In the above technical scheme, the end face of the one end of the rod body 8 connected with the pasting plate 11 is provided with the sealing plate 10.

[0020] In the above technical scheme, the short rod ear plate 13 is provided with the circular pasting plate 14 for increasing the strength.

[0021] In the above technical scheme, the two ends of the adjusting bolt 3 are provided with the pin shaft 6. The adjusting of the adjusting bolt 3 is limited by the pin shaft 6, so as to prevent the adjusting bolt 3 from being pulled out of the long rod threaded joint or the short rod threaded joint due to over-adjusting, and also to prevent the adjusting bolt 3 from being pulled out due to vibration during use.

[0022] In the above technical scheme, the middle position of the adjusting bolt 3 is provided with the through hole 16. The length of the A-shaped frame inclined support rod is adjusted by screwing the adjusting bolt 3, so as to achieve the best effect when the whole A-shaped frame bears the back leaning force of the lifting arm. The through hole 16 is provided, so as to be more convenient and fast when the tool is screwed.

[0023] In the above technical scheme, the rod body 9 is a square tube.

[0024] The above is only the preferable specific implementation manner of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A diagonal brace for an A-frame of a luffing jib tower crane, characterized in that: The system includes a long support rod, a short support rod, an adjusting bolt, a locking nut, and a pin. The adjusting bolt is a double-ended stud with opposite thread directions at both ends. One end is screwed to the long support rod, and the other end is screwed to the short support rod. A locking nut is also provided on the thread connecting the adjusting bolt to the long or short support rod. The length of the long support rod is greater than the length of the short support rod. The long support rod includes a rod body, a long rod lug, a connecting plate, a mounting plate, and a long rod threaded connector. One end of the rod body is connected to one end of the mounting plate, and the long rod threaded connector is fixedly connected to the other end of the mounting plate. The long rod threaded connector is screwed to one end of the adjusting bolt, and the other end of the rod body is connected to the connecting plate. The connecting plate is connected to the long rod lug. The short support rod includes a short rod threaded connector and a short rod lug. The short rod threaded connector is connected to the short rod lug and screwed to the other end of the aforementioned bolt.

2. The diagonal brace of the A-frame of the luffing jib tower crane according to claim 1, characterized in that: A sealing plate is provided at the end face where the rod connects to the plate.

3. The diagonal brace of the A-frame of the luffing tower crane according to claim 1, characterized in that: The short rod ear plate is provided with a round plate for increasing strength.

4. The diagonal brace of the A-frame of the luffing jib tower crane according to claim 1, characterized in that: The adjusting bolt has pins at both ends.

5. The diagonal brace of the A-frame of the luffing tower crane according to claim 1, characterized in that: The adjusting bolt has several through holes in the middle position.

6. The diagonal brace of the A-frame of the luffing tower crane according to claim 1, characterized in that: The rod is a square tube.

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