Small-angle automatic hook retracting mechanism with automatic positioning function

Abstract

The invention discloses a small-angle automatic hook retracting mechanism with an automatic positioning function, and relates to the technical field of engineering machinery. Comprising a lazy arm assembly, a third wheel assembly is fixedly installed at the position, close to the upper left side, of the lazy arm assembly, a turnover mechanism is arranged on the lower surface, corresponding to the third wheel assembly, of the lazy arm assembly, a limiting mechanism is installed on the lazy arm assembly corresponding to the turnover mechanism, and steel wire ropes are wound around the third wheel assembly and the turnover mechanism. A protection mechanism is arranged on the turnover mechanism corresponding to the steel wire rope, the steel wire rope is wound on a first pulley assembly on the lower side of the turnover mechanism, and the first pulley assembly is mounted between the upper inner wall and the lower inner wall of the lifting hook assembly; the automatic hook retracting device is compact in structure, the lifting hook and the arm body are horizontal after the hook is retracted in place, it is guaranteed that hook releasing is stable and reliable, the state is controllable after hook retracting, the accuracy of automatic hook retracting is improved, the time of automatic hook retracting is shortened, the service life of a steel wire rope is prolonged, and the safety of automatic hook retracting operation is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a small-angle automatic hook-retracting mechanism with an automatic positioning function. Background Art

[0002] At present, many truck-mounted cranes equipped with winch-type lifting mechanisms adopt a hook fixing method in which the hook is manually fixed at a certain place after the hook reaches a certain position, so that the hook is firmly fixed during driving. Before the lifting work begins, manual assistance is required to loosen the hook. This fixing method increases the labor intensity of the operator, reduces the working efficiency, and also poses certain safety risks.

[0003] In the prior art, the patent website discloses the "Automatic Hook Retracting Device for Lifting Hooks of Intelligent Truck-Mounted Cranes", which realizes automatic hook retraction by installing a limit mechanism and a locking mechanism on the upper end of the boom assembly. The principle is that when the hook assembly is retracted and touches the limit mechanism, the wire rope stops moving, and then a special hydraulic joystick is toggled to fix the hook assembly through the hook. The locking mechanism of this automatic hook retracting device has high matching accuracy, adds a separate hydraulic operation, increases the cost, and cannot guarantee the accuracy of hook retraction during the hook retraction process; The patent website discloses "Boom head of a truck-mounted crane transport vehicle equipped with an automatic hook collection device", which provides a boom head of a truck-mounted crane transport vehicle equipped with an automatic hook collection device. The automatic hook collection frame is directly fixed on the lifting pulley pin, and the hook can be locked in front of the boom head without occupying the height of the boom. The hook collection positioning bolt is installed directly below the boom head, and the hook can also be locked directly below the boom head. The wire rope trajectory in this automatic hook collection device is not restricted, and the hook collection state is unstable. After the hook is collected in place, it is flipped by eccentric force to form an angle, and the structure is not compact. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a small-angle automatic hook-retracting mechanism with an automatic positioning function to solve the problems raised in the above-mentioned background technology.

[0005] (II) Technical solution To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a small-angle automatic hook-collecting mechanism with an automatic positioning function, comprising a boom assembly, a wheel assembly fixedly installed on the boom assembly near the upper left side, a flipping mechanism is arranged on the lower surface of the boom assembly corresponding to the wheel assembly, a limiting mechanism is installed on the boom assembly corresponding to the flipping mechanism, a steel wire rope is wound around the wheel assembly and the flipping mechanism, and a protective mechanism is arranged on the flipping mechanism corresponding to the steel wire rope, the steel wire rope is wound around a first pulley assembly on the lower side of the flipping mechanism, the first pulley assembly is installed between the upper and lower inner walls of the hook assembly, a guide mechanism is arranged between the upper surface of the hook assembly and the flipping mechanism, the steel wire rope passes through the end of the first pulley assembly and is fixedly connected to the mounting mechanism, and the mounting mechanism is fixedly mounted on the front side of the boom assembly.

[0006] As a preferred technical solution of the present invention, the flipping mechanism includes a flipping frame, a pin assembly and a second pulley assembly. The flipping frame is installed between the front and rear side walls of the boom assembly through the pin assembly, and the boom corresponding to the flipping frame is installed with a second pulley assembly between the front and rear side walls near the lower side.

[0007] As a preferred technical solution of the present invention, the turning frame is a U-shaped structure when viewed from the right, and the lower side wall of the turning frame is a cross-shaped structure.

[0008] As a preferred technical solution of the present invention, the limiting mechanism includes a proximity switch, a switch limit block and a mechanical limit block. The proximity switch is fixedly installed on the boom assembly, and the switch limit blocks are installed on the front and rear inner walls of the flip frame corresponding to the proximity switch. The mechanical limit block is fixedly installed on the right side surface of the boom assembly corresponding to the lower side wall of the flip frame.

[0009] As a preferred technical solution of the present invention, the protective mechanism includes a protective plate, a locking bolt and a protective hole. The protective plate is fixedly installed on the lower inner wall of the flip frame by the locking bolt. The lower side wall of the protective plate is provided with a protective hole, and the protective hole is a rectangular structure.

[0010] As a preferred technical solution of the present invention, the guide mechanism includes a guide cone and a conical guide hole. The guide cone is fixedly installed on the upper surface of the hook assembly, and a conical guide hole is provided on the lower side wall of the flip frame and the protective plate corresponding to the guide cone.

[0011] As a preferred technical solution of the present invention, the installation mechanism includes a fixed block, a force sensor and a ring. The fixed block is fixedly installed on the boom assembly. The fixed block is equipped with a ring through the force sensor, and the ring is fixedly connected to the end of the wire rope.

[0012] As a preferred technical solution of the present invention, a half wheel is fixedly installed on the boom assembly at the lower side of the collar.

[0013] As a preferred technical solution of the present invention, a guide sleeve is installed on the boom assembly on the right side of the wheel assembly.

[0014] (III) Beneficial effects Compared with the prior art, the present invention provides a small-angle automatic hook-retracting mechanism with an automatic positioning function, which has the following beneficial effects: 1. The small-angle automatic hook-collecting mechanism with automatic positioning function ensures stable and reliable hook release and controllable state after hook collection by setting a flip mechanism to limit the moving track of the wire rope and adding double mechanical positioning devices. It has a compact structure and realizes that the hook is level with the arm after the hook is collected.

[0015] 2. The small-angle automatic hook-collecting mechanism with automatic positioning function increases the coordination between the guide cone and the tapered guide hole by setting a guide mechanism. Under the premise of not increasing the structural size, the accuracy of the automatic hook-collecting device is improved and the time of automatic hook-collecting is shortened.

[0016] 3. The small-angle automatic hook-collecting mechanism with automatic positioning function increases the service life of the wire rope by setting a protective mechanism and the contact surface of the wire rope, and installing detachable non-metallic plates. The setting of the limit mechanism ensures the safety of the automatic hook-collecting operation.

[0017] 4. The small-angle automatic hook-retracting mechanism with automatic positioning function limits the flipping mechanism by setting a limit mechanism, thereby ensuring the safety of the automatic hook-retracting operation and effectively avoiding damage to the boom assembly or the hook assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a small-angle automatic hook-collecting mechanism with an automatic positioning function proposed by the present invention; Figure 2 A schematic diagram of the hook retracting state of a hook assembly of a small-angle automatic hook retracting mechanism with an automatic positioning function proposed by the present invention; Figure 3 A partial cross-sectional view of a flip frame of a small-angle automatic hook collection mechanism with an automatic positioning function proposed by the present invention; Figure 4 This is a right view of a flip frame of a small-angle automatic hook collection mechanism with an automatic positioning function proposed by the present invention; Figure 5 A top view of a flip frame of a small-angle automatic hook collection mechanism with an automatic positioning function proposed by the present invention; Figure 6This is a bottom view of a flip frame of a small-angle automatic hook collection mechanism with an automatic positioning function proposed by the present invention.

[0019] In the figure: 1. boom assembly; 2. overwheel assembly; 3. flip mechanism; 301. flip frame; 302. pin assembly; 303. second pulley assembly; 4. limit mechanism; 401. proximity switch; 402. switch limit block; 403. mechanical limit block; 5. wire rope; 6. protection mechanism; 601. protection plate; 602. locking bolt; 603. protection hole; 7. first pulley assembly; 8. hook assembly; 9. guide mechanism; 901. guide cone; 902. conical guide hole; 10. installation mechanism; 101. fixing block; 102. force sensor; 103. collar; 11. half overwheel; 12. guide sleeve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 6 , a small-angle automatic hook-collecting mechanism with automatic positioning function, comprising a boom assembly 1, a wheel assembly 2 is fixedly installed on the boom assembly 1 near the upper left side, a turning mechanism 3 is arranged on the lower surface of the boom assembly 1 corresponding to the wheel assembly 2, a limiting mechanism 4 is installed on the boom assembly 1 corresponding to the turning mechanism 3, a steel wire rope 5 is wound around the wheel assembly 2 and the turning mechanism 3, and a protective mechanism 6 is arranged on the turning mechanism 3 corresponding to the steel wire rope 5, the steel wire rope 5 is located at the lower side of the turning mechanism 3 and is wound around a first pulley assembly 7, the first pulley assembly 7 is installed between the upper and lower inner walls of a hook assembly 8, a guide mechanism 9 is arranged between the upper surface of the hook assembly 8 and the turning mechanism 3, the steel wire rope 5 passes through the end of the first pulley assembly 7 and is fixedly connected to a mounting mechanism 10, and the mounting mechanism 10 is fixedly mounted on the front side of the boom assembly 1.

[0022] As a specific technical solution of this embodiment, the flipping mechanism 3 includes a flipping frame 301, a pin assembly 302 and a second pulley assembly 303. The flipping frame 301 is installed between the front and rear side walls of the boom assembly 1 through the pin assembly 302. The boom corresponding to the flipping frame 301 is installed with a second pulley assembly 303 between the front and rear side walls near the lower side.

[0023] In this embodiment, the second pulley assembly 303 guides the wire rope 5, and enables the wire rope 5 to drive the flip frame 301 to flip along the pin assembly 302, so that the flip frame 301 can maintain a horizontal state with the boom assembly 1, achieving the effect of hook retracting.

[0024] As a specific technical solution of this embodiment, the turning frame 301 is a U-shaped structure when viewed from the right, and the lower side wall of the turning frame 301 is a cross-shaped structure.

[0025] In this embodiment, the turnover frame 301 has a large structure, and the lower side wall of the turnover frame 301 does not contact the steel wire rope 5 .

[0026] As a specific technical solution of this embodiment, the limiting mechanism 4 includes a proximity switch 401, a switch limit block 402 and a mechanical limit block 403. The proximity switch 401 is fixedly installed on the boom assembly 1. The switch limit blocks 402 are installed on the front and rear inner walls of the flip frame 301 corresponding to the proximity switch 401. The mechanical limit block 403 is fixedly installed on the right side surface of the boom assembly 1 corresponding to the lower side wall of the flip frame 301.

[0027] In this embodiment, the proximity switch 401 and the switch limit block 402 limit the distance between the flip frame 301 and the boom assembly 1 to avoid collision between the flip frame 301 and the boom assembly 1, while ensuring that the flip frame 301 remains horizontal. The mechanical limit block 403 fits with the flip frame 301 to achieve the effect of limiting the flip frame 301.

[0028] As a specific technical solution of this embodiment, the protective mechanism 6 includes a protective plate 601, a locking bolt 602 and a protective hole 603. The protective plate 601 is fixedly installed on the lower inner wall of the flip frame 301 by the locking bolt 602. The protective hole 603 is opened on the lower side wall of the protective plate 601, and the protective hole 603 is a rectangular structure.

[0029] In this embodiment, the protective holes 603 of the protective plate 601 are used to guide the passage of the wire rope 5, ensuring smooth retraction and release of the wire rope 5 and reducing wear on the wire rope 5. The protective plate 601 is made of non-metallic plate and can be replaced regularly, with low maintenance costs.

[0030] As a specific technical solution of this embodiment, the guide mechanism 9 includes a guide cone 901 and a conical guide hole 902. The guide cone 901 is fixedly installed on the upper surface of the hook assembly 8, and the conical guide hole 902 is opened on the lower side wall of the flip frame 301 and the protective plate 601 corresponding to the guide cone 901.

[0031] In this embodiment, the guide cone 901 is inserted into the conical guide hole 902 to limit the position between the hook assembly 8 and the lower side wall of the flip frame 301 to prevent the hook assembly 8 from displacement or shaking.

[0032] As a specific technical solution of this embodiment, the installation mechanism 10 includes a fixed block 101, a force sensor 102 and a ring 103. The fixed block 101 is fixedly installed on the boom assembly 1. The fixed block 101 is equipped with a ring 103 through the force sensor 102. The ring 103 is fixedly connected to the end of the wire rope 5.

[0033] In this embodiment, the fixing block 101 is used to install the force sensor 102 and the ring 103. The ring 103 fixes the wire rope 5. The wire rope 5 pulls the force sensor 102 through the ring 103 to achieve the effect of detecting the tension of the wire rope 5.

[0034] As a specific technical solution of this embodiment, a half wheel 11 is fixedly installed on the boom assembly 1 at the lower side of the collar 103 .

[0035] In this embodiment, the half wheel 11 guides the steel wire rope 5 .

[0036] As a specific technical solution of this embodiment, a guide sleeve 12 is installed on the boom assembly 1 on the right side of the wheel assembly 2.

[0037] In this embodiment, the guide sleeve 12 guides the wire rope 5 and the pulley assembly 2 to ensure that the direction of the wire rope 5 is accurate.

[0038] The working principle and use process of the present invention are as follows: when in use, the steel wire rope 5 is built into the boom assembly 1, the right end of the steel wire rope 5 is connected to the winch, the steel wire rope 5 passes through the wheel assembly 2, the second pulley assembly 303 in the turnover mechanism 3 and the first pulley assembly 7 on the hook assembly 8 in sequence through the guide sleeve 12, so that the end of the steel wire rope 5 is fixedly connected to the fixed block 101 in the installation mechanism 10, and the winch is operated to reel the steel wire rope 5, so that the steel wire rope 5 drives the hook assembly 8 to move upward through the first pulley assembly 7, The guide cone 901 in the guide mechanism 9 on the upper surface of the hook assembly 8 is inserted into the conical guide hole 902 on the lower side wall of the turning frame 301 and the protective plate 601. The lower surface of the turning frame 301 is tightly fitted with the upper surface of the hook assembly 8. As the wire rope 5 continues to be wound, the wire rope 5 is guided and wound through the second pulley assembly 303, and the wire rope 5 drives the turning frame 301 to turn over along the pin shaft assembly 302. The turning frame 301 drives the hook assembly 8 to turn over, and the proximity switch 401 in the limit mechanism 4 is connected to the turning frame 301. The switch limit block 402 limits the distance between the tilting frame 301 and the boom assembly 1 to avoid collision between the tilting frame 301 and the boom assembly 1, and ensures that the tilting frame 301 remains horizontal. The mechanical limit block 403 fits the tilting frame 301 to limit the tilting frame 301 and achieve the effect of hook collection. By limiting the activity trajectory of the wire rope 5 and adding a double mechanical positioning device, it is ensured that the hook is released stably and reliably, the state after the hook is collected is controllable, the structure is compact, and after the hook is collected in place, The hook is level with the arm body, which improves the accuracy of the automatic hook retracting device without increasing the structural size, shortens the time of automatic hook retracting, and uses the protective holes 603 in the protective plate 601 in the protective mechanism 6 to guide the passage of the wire rope 5, thereby ensuring smooth retraction and release of the wire rope 5 and reducing the wear on the wire rope 5. Removable protective plates 601 are installed on all contact surfaces with the wire rope 5, which extends the service life of the wire rope 5, ensures the safety of the automatic hook retracting operation, and effectively avoids damage to the boom assembly 1 or the hook assembly 8.

[0039] To sum up, the small-angle automatic hook-collecting mechanism with automatic positioning function has a compact structure. After the hook is collected in place, the hook is level with the arm body. Measures such as limiting the activity trajectory of the wire rope 5 and adding a double mechanical positioning device are taken to ensure that the hook is released smoothly and reliably and the state after the hook is collected is controllable. The guide mechanism 9 is added to improve the accuracy of the automatic hook-collecting device without increasing the structural size, shorten the time of automatic hook collection, and all the contact surfaces with the wire rope 5 are installed with detachable protective plates 601 to increase the service life of the wire rope 5. The setting of the limit mechanism 4 ensures the safety of the automatic hook-collecting operation.

[0040] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small-angle automatic hook-retracting mechanism with an automatic positioning function, comprising a boom assembly (1), characterized in that: The boom assembly (1) is fixedly provided with a wheel assembly (2) near the upper left side, a turning mechanism (3) is provided on the lower surface of the boom assembly (1) corresponding to the wheel assembly (2), a limiting mechanism (4) is provided on the boom assembly (1) corresponding to the turning mechanism (3), a steel wire rope (5) is wound around the wheel assembly (2) and the turning mechanism (3), and a protection mechanism (6) is provided on the turning mechanism (3) corresponding to the steel wire rope (5), the steel wire rope (5) is wound around a first pulley assembly (7) located at the lower side of the turning mechanism (3), the first pulley assembly (7) is installed between the upper and lower inner walls of the hook assembly (8), a guiding mechanism (9) is provided between the upper surface of the hook assembly (8) and the turning mechanism (3), the steel wire rope (5) passes through the end of the first pulley assembly (7) and is fixedly connected to the mounting mechanism (10), and the mounting mechanism (10) is fixedly installed on the front side of the boom assembly (1).

2. According to claim 1, a small-angle automatic hook-collecting mechanism with automatic positioning function is characterized in that: The turning mechanism (3) comprises a turning frame (301), a pin assembly (302) and a second pulley assembly (303); the turning frame (301) is installed between the front and rear side walls of the boom assembly (1) via the pin assembly (302); and the boom corresponding to the turning frame (301) is installed with the second pulley assembly (303) between the front and rear side walls and close to the lower side.

3. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 2, characterized in that: The turning frame (301) is a U-shaped structure when viewed from the right, and the lower side wall of the turning frame (301) is a cross-shaped structure.

4. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 1, characterized in that: The limit mechanism (4) comprises a proximity switch (401), a switch limit block (402) and a mechanical limit block (403); the proximity switch (401) is fixedly mounted on the boom assembly (1); the switch limit blocks (402) are mounted on the front and rear inner walls of the tilting frame (301) corresponding to the proximity switch (401); and the mechanical limit block (403) is fixedly mounted on the right side surface of the boom assembly (1) corresponding to the lower side wall of the tilting frame (301).

5. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 1, characterized in that: The protection mechanism (6) comprises a protection plate (601), a locking bolt (602) and a protection hole (603); the protection plate (601) is fixedly mounted on the lower inner wall of the turning frame (301) via the locking bolt (602); the protection hole (603) is provided on the lower wall of the protection plate (601), and the protection hole (603) is a rectangular structure.

6. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 1, characterized in that: The guide mechanism (9) comprises a guide cone (901) and a conical guide hole (902); the guide cone (901) is fixedly mounted on the upper surface of the hook assembly (8); and the conical guide hole (902) is provided on the lower side wall of the turning frame (301) and the protective plate (601) corresponding to the guide cone (901).

7. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 1, characterized in that: The mounting mechanism (10) comprises a fixed block (101), a force sensor (102) and a collar (103); the fixed block (101) is fixedly mounted on the boom assembly (1); the fixed block (101) is provided with a collar (103) via the force sensor (102); and the collar (103) is fixedly connected to an end of a steel wire rope (5).

8. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 1, characterized in that: A half wheel (11) is fixedly mounted on the boom assembly (1) at the lower side of the collar (103).

9. The small-angle automatic hook-collecting mechanism with automatic positioning function according to claim 1, characterized in that: A guide sleeve (12) is installed on the boom assembly (1) at the right side of the wheel assembly (2).

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