Single trolley hook 2x4 ratio conversion system

Abstract

This utility model provides a single-trolley hook 2x4 ratio conversion system, including an upper pulley block, a lower pulley block, a double-link plate, a pin shaft, a double-link plate hole, a boom root stop block, and a guide limiting device. The upper pulley block is connected to the luffing trolley; the lower pulley block is connected to the hook assembly; the double-link plate is hinged to the upper pulley block, and a double-link plate hole is provided on the double pulley block. A pin shaft is provided on the lower pulley block, and the pin shaft matches the double-link plate hole. A guide limiting device is provided on the lower side of the upper pulley block, and the guide limiting device is perpendicular to the upper pulley block. The lower part of the guide limiting device has an open guide groove, and the guide groove matches the lower pulley block. It can realize remote one-button operation from the driver's cab, automatically complete the ratio conversion, and improve work efficiency and safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of crane lifting systems, and in particular to a single trolley hook 2-4 ratio conversion system. Background Technology

[0002] To accommodate different lifting capacities and speeds, tower cranes typically require lifting pulley blocks with a conversion function, commonly switching between 2x and 4x ratios. Traditional conversion methods often involve manual pin insertion, requiring operators to climb onto the trolley for manual operation. This is not only time-consuming, labor-intensive, and inefficient, but also poses serious safety hazards due to working at height.

[0003] While some semi-automatic conversion schemes have emerged in existing technologies, they still suffer from problems such as difficulty in alignment, poor reliability, and complex operation. For example, during the conversion process, it is difficult to accurately align the hook assembly and the trolley pulley assembly, resulting in the pin not being able to be inserted smoothly; or, when converting from four-fold to two-fold magnification, incomplete unlocking may occur, posing a risk of accidental disengagement. Therefore, there is an urgent need for an automatic magnification conversion system that is easy to operate, accurately aligned, and safe and reliable. Utility Model Content

[0004] In view of the above problems, the purpose of this application is to provide a method that enables remote one-click operation from the driver's cab to automatically complete the rate conversion, thereby improving work efficiency and safety.

[0005] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a single trolley hook 2x4 ratio conversion system, including an upper pulley block, a lower pulley block, a double-plate, a pin shaft, a double-plate hole, a boom root stop block, and a guide limit device; The upper pulley block is connected to the luffing trolley; the lower pulley block is connected to the hook block. The double-plate is hinged to the upper pulley assembly. The double-plate has a double-plate hole. The lower pulley assembly is provided with a pin, which matches the double-plate hole. A guide limiting device is provided on the lower side of the upper pulley assembly. The guide limiting device is perpendicular to the upper pulley assembly, and the lower part of the guide limiting device has an open guide groove that matches the lower pulley assembly.

[0006] Furthermore, it also includes a guide cylinder; the upper part of the lower pulley assembly is provided with a guide cylinder, which contacts the guide limiting device.

[0007] Furthermore, the guide limiting device is configured as a curved guide surface extending away from the upper pulley block, and the curved guide surface matches the cylindrical surface of the guide cylinder.

[0008] Furthermore, the boom root stop block is disposed at the root of the boom to limit the position of the luffing trolley. The boom root stop block interacts with the double-plate, and the boom root stop block causes the double-plate to open to release the pin.

[0009] Furthermore, the guide groove is V-shaped or U-shaped.

[0010] Furthermore, stop plates are provided at both ends of the pin to prevent the pin from coming out.

[0011] Furthermore, the lower part of the double-plate is provided with an inclined structure, which guides the pin to slide into the hole of the double-plate.

[0012] Furthermore, the double-plate hole includes an upper guide area and a lower locking area; the size of the upper guide area is larger than that of the pin, and the size of the lower locking area matches that of the pin.

[0013] Furthermore, the lower pulley block has two hanging pulleys.

[0014] Compared with existing technologies, the advantages of this invention are as follows: By combining electronic control buttons and mechanical linkage, all ratio conversion operations can be completed remotely from the driver's cab, completely avoiding the risks of manual high-altitude operations and improving work efficiency. The precise cooperation between the guide limit device and the guide cylinder ensures that the lower pulley group automatically and accurately aligns with the upper pulley group during the ascent, greatly improving the success rate and reliability of pin insertion. Utilizing the mechanical trigger mechanism on the arm root stop block, the kinetic energy of the trolley's movement forcibly pushes open the double-plate, ensuring a positive and reliable unlocking action and effectively preventing accidental detachment or conversion failure due to incomplete unlocking. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention in its four-fold magnification working state; Figure 2 This is a schematic diagram of the structure of the present invention in its 2x magnification working state; Figure 3 This is a schematic diagram illustrating the opening action of the double-panel of this utility model; Figure 4 This is a schematic diagram of the lower pulley block of this utility model; Figure 5 This is a schematic diagram showing the cooperation between the guide limiting device and the guide cylinder of this utility model; Figure 6 This utility model relates to a rope winding system; In the diagram: 1. Upper pulley block; 2. Lower pulley block; 3. Double-link plate; 4. Pin; 5. Double-link plate hole; 6. Arm root stop block; 7. Guide limit device; 8. Guide cylinder; 9. Guide groove; 10. Curved guide surface; 11. Stop plate; 12. Inclined structure; 13. Drum; 14. Swing wheel; 15. No. 1 tower head pulley; 16. No. 2 tower head pulley; 17. Luffing trolley pulley; 18. Locking arm head; 19. Lifting pulley. Detailed Implementation

[0016] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0017] See appendix Figure 1-6 The single trolley hook 2-4 ratio conversion system includes an upper pulley block 1, a lower pulley block 2, a double connecting plate 3, a pin shaft 4, a double connecting plate hole 5, an arm root stop block 6, and a guide limit device 7. The upper pulley block 1 is connected to the luffing trolley; the lower pulley block 2 is connected to the hook assembly. The double-plate 3 is hinged to the upper pulley group 1. The double-plate 3 has a double-plate hole 5. The lower pulley group 2 is provided with a pin 4, which matches the double-plate hole 5. The lower side of the upper pulley group 1 is provided with a guide limiting device 7, which is perpendicular to the upper pulley group 1. The lower part of the guide limiting device 7 is provided with an open guide groove 9, which matches the lower pulley group 2.

[0018] The hoisting limit switch is used to control the hoisting height; the limit button is used to temporarily release the hoisting or luffing limit. It also includes a guide cylinder 8; the upper part of the lower pulley group 2 is provided with a guide cylinder 8, which contacts the guide limiting device 7; during the magnification conversion process, the guide cylinder 8 is adapted to contact and move relative to the guide groove 9 of the guide limiting device 7, so as to guide the lower pulley group 2 to align and enter the guide groove 9.

[0019] The guide limiting device 7 is configured as a curved guide surface 10 extending away from the upper pulley block 1, and the curved guide surface 10 matches the cylindrical surface of the guide cylinder 8.

[0020] The boom root stop block 6 is located at the root of the boom and is used to limit the position of the luffing trolley. The boom root stop block 6 interacts with the double-plate 3, and the boom root stop block 6 causes the double-plate 3 to open to release the pin 4, thereby realizing the 2x ratio conversion.

[0021] The guide groove 9 is in the shape of a "V" or a "U".

[0022] The pin 4 is provided with stop plates 11 at both ends. When the pin 4 is inserted into the double-plate hole 5, the stop plates 11 can automatically spring up or rotate, and the stop plates 11 prevent the pin 4 from coming out.

[0023] The lower part of the double-plate 3 is provided with an inclined structure 12, which guides the pin 4 into the double-plate hole 5 when the lower pulley group 2 rises.

[0024] The double-plate hole 5 includes an upper guide area and a lower locking area; the size of the upper guide area is larger than that of the pin 4, and the size of the lower locking area matches that of the pin 4.

[0025] The lower pulley block 2 has two hanging pulleys 19.

[0026] How does the automatic 2x / 4x conversion function work? 1. Converting from a 2x multiplier to a 4x multiplier (multiplier, linkage) Initial state: The system is in a double-amplitude state. The hook assembly falls, and the lower pulley block 2 separates from the upper pulley block 1. The double-plate 3 remains closed inward under its own weight or the action of the torsion spring. The pin 4 is in the low position along with the lower pulley block 2.

[0027] Objective: To lock the lower pulley block 2 and the upper pulley block 1 together with pin 4 to form a four-fold rope winding system.

[0028] 1: The operator operates the "ascend" gear at low speed in the driver's cab and presses the limit switch button to temporarily release the lifting height limit.

[0029] 2: The lower pulley block 2 rises. The lower pulley block 2 assembly may wobble, and its guide cylinder 8 first contacts the curved guide surface 10 of the guide limiting device 7. Under the guidance of the curved guide surface 10, the lower pulley block 2 is automatically and accurately corrected to the center position, and finally the upper structure of the lower pulley block 2 smoothly enters the guide groove 9.

[0030] 3: Continue to rise, the pin 4 on the lower pulley block 2 contacts the inclined surface 12 on the inner side of the double plate 3, opening the closed double plate 3 and sliding into the double plate hole 5.

[0031] 4: The stop plates 11 at both ends of the pin 4 automatically pop up or rotate and lock onto the outside of the double plate 3 to prevent the pin 4 from coming out and achieve mechanical locking.

[0032] 5: The operator operates the "lower" setting, and the wire rope is tensioned. At this point, the upper and lower pulley sets are rigidly connected, and the system enters the four-fold operating state.

[0033] II. Converting from 4x to 2x (reducing the multiplier, decoupling) Initial state: The system is in a 4x ratio state. The upper pulley block 1 and the lower pulley block 2 are connected as one unit by the pin 4. The stop plate 11 is in the locked state.

[0034] Objective: To separate the lower pulley block 2 from the upper pulley block 1 and restore it to a double-ratio rope winding system.

[0035] 1. The operator operates the "lift" gear at low speed and presses the limit switch button. The entire hook assembly rises until the upper pulley block 1 is close to the luffing trolley. This action moves the pin 4 within the double-plate hole 5 to a position that facilitates disengagement, i.e., the upper guide zone.

[0036] 2: Manually or automatically retract the stop plate 11.

[0037] 3: The operator operates the "inward luffing" setting and presses the limit button again to temporarily release the amplitude restriction, causing the trolley to move towards the base of the boom.

[0038] 4: The trolley moves to the arm root stop block 6. The triggering mechanism on the stop block 6, such as the inclined wedge block, presses the lower outer side of the double plate 3, overcoming its closing tendency and forcing it to open outward, and the double plate hole 5 releases the pin 4.

[0039] 5: The operator operates the "lower" position, and the lower pulley block 2 descends under the action of gravity, separating from the upper pulley block 1.

[0040] 6: The operator manipulates the trolley to "boom outwards," moving it away from the boom root. The double-panel 3 closes again under its own weight. At this point, the system returns to its double-magnification operating state.

[0041] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A single-trolley hook 2x4 ratio conversion system, characterized in that: It includes an upper pulley block (1), a lower pulley block (2), a double-plate (3), a pin (4), a double-plate hole (5), an arm root stop block (6), and a guide limit device (7). The upper pulley block (1) is connected to the luffing trolley; the lower pulley block (2) is connected to the hook block; The double-plate (3) is hinged to the upper pulley group (1), and a double-plate hole (5) is opened on the double-plate (3). A pin (4) is provided on the lower pulley group (2), and the pin (4) matches the double-plate hole (5). The lower side of the upper pulley group (1) is provided with a guide limiting device (7), which is perpendicular to the upper pulley group (1). The lower part of the guide limiting device (7) is provided with an open guide groove (9), which matches the lower pulley group (2).

2. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: It also includes a guide cylinder (8); the upper part of the lower pulley block (2) is provided with a guide cylinder (8), and the guide cylinder (8) is in contact with the guide limiting device (7).

3. The single trolley hook 2x4 ratio conversion system according to claim 2, characterized in that: The guide limiting device (7) is configured as a curved guide surface (10) extending away from the upper pulley block (1), and the curved guide surface (10) matches the cylindrical surface of the guide cylinder (8).

4. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: The boom root stop block (6) is located at the root of the boom and is used to limit the position of the luffing trolley. The boom root stop block (6) interacts with the double-plate (3). The boom root stop block (6) causes the double-plate (3) to open to release the pin (4).

5. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: The guide groove (9) is V-shaped or U-shaped.

6. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: The pin (4) is provided with stop plates (11) at both ends, and the stop plates (11) prevent the pin (4) from coming out.

7. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: The lower part of the double plate (3) is provided with a slope structure (12), which guides the pin (4) to slide into the hole (5) of the double plate.

8. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: The double-plate hole (5) includes an upper guide area and a lower locking area; the size of the upper guide area is larger than that of the pin (4), and the size of the lower locking area matches that of the pin (4).

9. The single trolley hook 2x4 ratio conversion system according to claim 1, characterized in that: The lower pulley block (2) has two hanging pulleys (19).

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