Variable-amplitude steel wire rope tensioning structure and large-tonnage tower crane

Abstract

The variable-amplitude steel wire rope tensioning structure comprises a hand winch, a fixed base, a pulley block, a telescopic rod and a variable-amplitude pulley, a winch steel wire rope on the hand winch is fixedly connected to the telescopic rod through the pulley block, the telescopic rod is adjustably installed on the fixed base, and the variable-amplitude pulley is arranged on the fixed base. The end part of the telescopic rod is connected with the variable-amplitude pulley; the hand-cranking winch is operated to enable the winch steel wire rope to move around the tensioning pulley of the pulley block, the winch steel wire rope pulls the telescopic rod and the variable-amplitude pulley to move in the fixed base, and the telescopic rod is fixed to the fixed base after moving in place. According to the variable-amplitude steel wire rope tensioning device, the mode that the hand winch and the pulley blocks are combined is adopted, and the requirements for the tension force of the variable-amplitude steel wire rope under different working conditions can be met through multiplying power change between the pulley blocks and replacement of the rope tensioning force of the hand winch; and through adjustable matching between the telescopic rod and the adjusting hole in the fixed base, the tensioning force is kept constant, so that the operation requirement of the whole machine is met.

Description

Technical Field

[0001] The utility model relates to a variable-length steel wire rope tensioning structure and a large-tonnage tower crane, belonging to the technical field of tower cranes. Background Art

[0002] With the expansion of large-scale equipment such as bridges, thermal power plants, and nuclear power plants, the market demand for large-tonnage tower cranes is increasing, and tower cranes are developing in the direction of large-scale and intelligent. With the increase of lifting weight and rated torque, it is becoming increasingly difficult to tension large-diameter wire ropes. The main problems are as follows: (1) It is difficult to adjust the existing luffing wire rope of large-tonnage tower cranes, and it is impossible to adjust the tension in time according to the lifting weight and lifting torque. (2) The existing manual adjustment has low installation efficiency and is only suitable for small-tonnage tower cranes and models with small luffing wire rope diameters. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the utility model provides a variable-length wire rope tensioning structure and a large-tonnage tower crane, which have a wide range of applications and are easy to install and disassemble, and can meet the use requirements of various lifting conditions.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts a variable-length wire rope tensioning structure, including a hand winch, a fixed base, a pulley block, a telescopic rod and a variable-length pulley. The winch wire rope on the hand winch is connected and fixed to the telescopic rod through the pulley block. The telescopic rod is adjustably mounted on the fixed base, and the end of the telescopic rod is connected to the variable-length pulley. The hand winch is operated to make the winch wire rope move around the tensioning pulley of the pulley block, and the winch wire rope pulls the telescopic rod and the variable-length pulley to move in the fixed base. After the telescopic rod moves into place, it is fixed to the fixed base.

[0005] In some embodiments, the pulley block includes two sets of tension pulleys arranged opposite to each other, one set of tension pulleys is coaxially fixed on a fixed base, and the other set of tension pulleys is coaxially fixed on an end of the telescopic rod.

[0006] In some embodiments, each set of tensioning pulleys is connected via a connecting pin, and an end of the connecting pin is installed with an end stopper.

[0007] In some embodiments, one end of the telescopic rod on which the tensioning pulley is mounted is provided with a wedge-shaped joint for connecting a winch wire rope.

[0008] In some embodiments, the fixed base is provided with a plurality of adjustment holes, the telescopic rod is provided with a connecting hole, and the connecting hole on the telescopic rod is connected to the adjustment hole on the fixed base via a fastening pin.

[0009] In some embodiments, the adjustment holes and the connecting holes are both round holes.

[0010] In some embodiments, the luffing pulley is connected to the luffing wire rope of the whole machine, and one end of the luffing wire rope is wound around the luffing mechanism.

[0011] In some embodiments, the other end of the variable amplitude wire rope is connected to a load-carrying trolley.

[0012] In some embodiments, the hand winch is mounted on a fixed base.

[0013] A second aspect of the utility model provides a large-tonnage tower crane, on which the variable-length steel wire rope tensioning structure is installed.

[0014] Compared with the prior art, the luffing wire rope tensioning structure of the utility model adopts the form of a hand-cranked winch and a pulley block combination. By changing the ratio between the pulley blocks and changing the hand-cranked winch rope tensioning force, the requirements for luffing wire rope tensioning force under different working conditions can be met; the tensioning force is kept constant through the adjustable cooperation between the telescopic rod and the adjustment hole on the fixed base, thereby meeting the operation requirements of the whole machine. The utility model solves the problem that the luffing wire rope of a large-tonnage tower crane is difficult to tension and install due to its large diameter and heavy deadweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the rope winding structure of the pulley block of the utility model;

[0018] Figure 3 It is a schematic diagram of the pulley arrangement of the pulley block of the utility model;

[0019] Figure 4 Schematic diagram of the movement of the telescopic rod of the utility model in the fixed base; (a) is the initial state, (b) is the moved into place state;

[0020] Figure 5 This is a schematic diagram of the variable amplitude steel wire rope winding structure of the utility model;

[0021] Figure 6 Schematic diagram of the variable-length steel wire rope tensioning of the utility model; (a) is the initial state, (b) is the tensioned state;

[0022] In the figure: 1. hand-cranked winch, 2. fixed base, 21. adjustment hole, 22. fastening pin, 3. pulley block, 31. tensioning pulley, 32. shaft end baffle, 33. connecting pin, 34. wedge joint, 4. telescopic rod, 5. luffing pulley, 51. upper pulley, 52. middle pulley, 53. lower pulley, 6. luffing wire rope, 7. luffing mechanism, 8. load-carrying trolley. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "assembly", "fixation" and "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figures 1 to 6 As shown, a luffing wire rope tensioning structure includes a hand-cranked winch 1, a fixed base 2, a pulley block 3, a telescopic rod 4 and a luffing pulley 5;

[0026] The winch wire rope on the hand winch 1 is connected and fixed to the telescopic rod 4 through the pulley block 3. The telescopic rod 4 is adjustably mounted on the fixed base 2. The end of the telescopic rod 4 is connected to the luffing pulley 5.

[0027] The hand winch 1 is operated to make the winch wire rope move around the tensioning pulley 31 of the pulley block 3, and the winch wire rope pulls the telescopic rod 4 and the luffing pulley 5 to move in the fixed base 2. After the telescopic rod 4 moves into place, it is fixed on the fixed base 2. The utility model is based on the situation that the luffing wire rope of the super-large tower crane has a large diameter and a heavy weight, which makes it difficult to tension the wire rope. By adjusting the bearing capacity of the hand winch 1 and the number of pulley blocks 3, the required tensioning force is achieved, and the luffing wire rope is tensioned.

[0028] In some embodiments, Figure 2 , Figure 3As shown, the pulley block 3 includes two sets of tension pulleys 31 arranged opposite to each other, one set of tension pulleys 31 is coaxially fixed on the fixed base 2, and the other set of tension pulleys 31 is coaxially fixed on the end of the telescopic rod 4. Through the mutual cooperation of multiple tension pulleys 31, the tensioning efficiency of the variable-length steel wire rope is improved.

[0029] In some embodiments, Figure 3 As shown, each set of tension pulleys 31 are connected via a connecting pin 33, and an end of the connecting pin 33 is installed with an axis end baffle 32, which is convenient for installation and improves installation stability.

[0030] In some embodiments, Figure 3 As shown, one end of the tension pulley 31 is mounted on the telescopic rod 4, and a wedge-shaped joint 34 is provided for connecting the winch wire rope. The winch wire rope on the hand winch 1 is wound around the tension pulleys 31 on both sides, and finally connected and fixed to the wedge-shaped joint 34 on the telescopic rod 4, so when the hand winch 1 is rotated, the telescopic rod 4 can be pulled to move on the fixed base 2.

[0031] In some embodiments, Figure 4 As shown, the fixed base 2 is provided with a plurality of adjustment holes 21, and the telescopic rod 4 is provided with a connection hole, and the connection hole on the telescopic rod 4 is connected with the adjustment hole 21 on the fixed base 2 through a fastening pin 22. By virtue of the connection hole on the telescopic rod 4 and the adjustment hole 21 on the fixed base 2 cooperating with each other, it is convenient to adjust the installation position of the telescopic rod 4 on the fixed base 2, and then adjust the position of the luffing pulley 5, so as to adjust the tension of the luffing wire rope.

[0032] In some embodiments, Figure 4 As shown, the adjustment hole 21 and the connection hole can both be designed as round holes for easy processing.

[0033] In some embodiments, Figure 5 As shown, the luffing pulley 5 is connected to the luffing wire rope 6 of the whole machine, one end of the luffing wire rope 6 is wound on the luffing mechanism 7, and the other end is connected to the load trolley 8. The luffing wire rope is wound on the luffing mechanism 7 in sequence, and the middle luffing wire rope passes through a series of transitions such as the upper pulley 51, the middle pulley 52, and the lower pulley 53, and is finally connected and fixed on the load trolley 8. By adjusting the position of the luffing pulley 5, the tension of the luffing wire rope can be adjusted.

[0034] In some embodiments, Figure 1 As shown, the hand winch 1 is installed on a fixed base 2, and the structure is more stable.

[0035] The second aspect of the utility model further provides a large-tonnage tower crane, on which the variable-length steel wire rope tensioning structure is installed.

[0036] When the luffing wire rope is initially installed, it is in a relaxed state. Due to its own weight, the luffing wire rope has a certain degree of deflection and sag. At this time, the luffing wire rope needs to be tensioned. Combined with the previous description, the manual winch 1 is manually operated, through the tensioning of its own wire rope, the transition of multiple tensioning pulleys 31 in the pulley block 3, to provide corresponding pulling force to the telescopic rod 4. The telescopic rod 4 drives the luffing pulley 5 and the luffing wire rope 6 to complete the corresponding rope tightening action. When the telescopic rod 4 reaches the appropriate position, the telescopic rod 4 is fixed to the fixed base 2 by tightening the pin 22, so that the luffing wire rope is in tension, preparing for the next lifting operation. Specifically, Figure 6 shown.

[0037] The luffing wire rope tensioning structure of the utility model adopts the combination of a hand-cranked winch and a pulley block. By changing the ratio between the pulley blocks and changing the tightening force of the hand-cranked winch, the requirements for luffing wire rope tensioning force under different working conditions can be met. The adjustable cooperation between the telescopic rod and the adjustment hole on the fixed base can keep the tensioning force constant, thereby meeting the operation requirements of the whole machine. The utility model solves the problem that the luffing wire rope of a large-tonnage tower crane is difficult to tension and install due to its large diameter and heavy deadweight.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable amplitude steel wire rope tensioning structure, characterized in that: The invention comprises a hand winch (1), a fixed base (2), a pulley block (3), a telescopic rod (4) and a luffing pulley (5), wherein a winch wire rope on the hand winch (1) is connected and fixed to the telescopic rod (4) through the pulley block (3), the telescopic rod (4) is adjustably mounted on the fixed base (2), and the end of the telescopic rod (4) is connected to the luffing pulley (5); the hand winch (1) is operated to make the winch wire rope move around a tensioning pulley (31) of the pulley block (3), the winch wire rope pulls the telescopic rod (4) and the luffing pulley (5) to move in the fixed base (2), and the telescopic rod (4) is fixed to the fixed base (2) after moving into position.

2. The variable amplitude steel wire rope tensioning structure according to claim 1, characterized in that: The pulley block (3) comprises two sets of tension pulleys (31) arranged opposite to each other, one set of tension pulleys (31) being coaxially fixed on the fixed base (2), and the other set of tension pulleys (31) being coaxially fixed on the end of the telescopic rod (4).

3. The variable amplitude steel wire rope tensioning structure according to claim 2, characterized in that: Each set of tension pulleys (31) is connected via a connecting pin (33), and an end of the connecting pin (33) is provided with an end baffle (32).

4. The variable amplitude steel wire rope tensioning structure according to claim 2, characterized in that: One end of the telescopic rod (4) on which the tension pulley (31) is mounted is provided with a wedge-shaped joint (34) for connecting a winch wire rope.

5. The variable amplitude steel wire rope tensioning structure according to claim 1, characterized in that: The fixed base (2) is provided with a plurality of adjustment holes (21), the telescopic rod (4) is provided with a connection hole, and the connection hole on the telescopic rod (4) is connected to the adjustment hole (21) on the fixed base (2) via a fastening pin (22).

6. The variable amplitude steel wire rope tensioning structure according to claim 5, characterized in that: The adjustment hole (21) and the connection hole are both round holes.

7. The variable amplitude steel wire rope tensioning structure according to claim 1, characterized in that: The luffing pulley (5) is connected to the luffing steel wire rope (6) of the whole machine, and one end of the luffing steel wire rope (6) is wound around the luffing mechanism (7).

8. The variable amplitude steel wire rope tensioning structure according to claim 7, characterized in that: The other end of the variable amplitude steel wire rope (6) is connected to the load-carrying trolley (8).

9. The variable amplitude steel wire rope tensioning structure according to claim 1, characterized in that: The hand-cranked winch (1) is mounted on a fixed base (2).

10. A large-tonnage tower crane, characterized in that: The large-tonnage tower crane is equipped with the variable-length steel wire rope tensioning structure described in any one of claims 1 to 9.

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