Lifting hook lifting stop device of crane

Abstract

The utility model discloses a lifting hook lifting stop device of a crane. The lifting hook lifting stop device comprises a U-shaped bracket plate, a large arm frame, a small arm frame and a hanging block, openings are formed in the top, the bottom and one side wall of the U-shaped support plate, an overload limiter is fixedly arranged on the outer wall of the middle of the U-shaped support plate, one end of a steel wire rope vertically penetrates through and is fixedly hung in the U-shaped support plate, and a large arm frame is hinged to the outer walls of the two sides of the U-shaped support plate in a limiting mode; the bottom end of the large arm frame is hinged to the small arm frame in a limiting mode, and a pin shaft at the bottom end of the small arm frame is rotationally connected with a hanging block. The stopping device does not need to apply extra tension to the steel wire rope to trigger the overload limiter to control the winch to be powered off, the service life of the steel wire rope is effectively prolonged, power-off control of the winch is triggered in a staged and multi-stage mode, and the ascending inertia problem of a lifting hook is solved while the lifting hook is prevented from ascending to impact a crane main beam; the anti-collision allowance of the crane is effectively improved through a multi-stage insurance mode, and the service life of the crane is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a hook lifting stop device of a crane. Background Art

[0002] When the crane hook is working, the winch drags the wire rope to provide lifting force for the hook. During this process, the movable pulley on the hook is rolled and mounted on the middle of the wire rope, and the other end of the wire rope is fixedly hung on the main beam of the crane. An overload limiter is installed at the fixed hanging end of the wire rope. The overload limiter radially clamps the bent wire rope. After the wire rope is loaded, the bent part is subjected to radial tensioning. The radial tensioning force is detected by the detection end of the overload limiter to realize wire rope overload limit monitoring. When the wire rope is subjected to overload force, the overload limiter sends a signal to the central control machine to cut off the power to the winch to ensure the safety of the lifting work.

[0003] Another problem currently faced by cranes is the lack of effective stop control when the hook reaches its upper limit. Existing technologies often mechanically constrain the hook's upward movement by adding a collision block beneath the crane's main beam. During this process, the overload limiter increases the tension in the wire rope and then powers down the winch. While this power-off method prevents the hook from ascending, it still fails to immediately control the winch's active power outage, potentially placing excessive tension on the wire rope.

[0004] Therefore, how to design a hook lifting stop device for a crane to control the maximum upward position of the hook in a winch power-off mode has become a technical problem that needs to be solved urgently by people in this field. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a crane hook lifting stop device. This device triggers an overload limiter to control the power off of the hoist without applying additional tension to the wire rope, effectively extending the service life of the wire rope. The device also triggers the power off control of the hoist in multiple stages, preventing the hook from colliding with the crane main beam while also solving the problem of the hook's upward inertia. Through the multi-stage safety mechanism, the crane's anti-collision margin is effectively increased, thereby extending the crane's service life.

[0006] In order to solve the above problems, the utility model provides a hook lifting stop device for a crane, including an overload limiter, wherein the crane hook is hung on the middle section of a wire rope via a movable pulley, one end of the wire rope is fixedly hung on the detection end of the overload limiter, and the other end of the wire rope is wound around and connected to a winch that provides lifting force for the crane;

[0007] The stop device includes a U-shaped bracket plate, a boom frame, a jib frame and a hanging block; the top, bottom and one side wall of the U-shaped bracket plate are open, an overload limiter is fixed on the middle outer wall of the U-shaped bracket plate, the interior of the U-shaped bracket plate vertically penetrates and fixes one end of the hanging wire rope, and the upper limit hinges on both sides of the outer wall of the U-shaped bracket plate are connected to the boom frame;

[0008] The bottom end of the big arm frame is limitedly hinged and connected to the small arm frame, and the bottom end pin of the small arm frame is rotatably connected to the hanging block;

[0009] The hanging block is radially limited and spaced outside the wire rope. The hanging block is lifted by the crane hook to provide upward movement force, and the hanging block is restrained by the boom frame and the jib frame to provide downward limit position.

[0010] A first electric control switch is provided above the hinged connection between the boom frame and the U-shaped bracket plate, and a second electric control switch is provided at the hinged connection between the boom frame and the arm frame. The first electric control switch and the second electric control switch are triggered by the change in the inclination attitude of the boom frame and the arm frame.

[0011] Preferably, the two back-facing side walls of the U-shaped bracket plate are hingedly connected to the middle section of the boom frame by pins, and the two back-facing side walls of the U-shaped bracket plate are fixed with a boom limit block and a first electric control switch; the boom limit block constrains the maximum rotation angle of the top end of the boom frame for flipping downward; the first electric control switch constrains the maximum rotation angle of the top end of the boom frame for flipping upward.

[0012] Preferably, a second electric control switch is fixed to the lower part of the boom frame, and a limit pin is horizontally inserted at the bottom end of the boom frame; a supporting spring is fixed to the upper part of the small arm frame, the top end of the small arm frame is hingedly connected to the bottom end pin shaft of the boom frame, and the upper side wall of the small arm frame is constrained by the limit pin to limit the maximum rotation angle between the boom frame and the small arm frame; the supporting spring cooperates to support and trigger the second electric control switch as the angle between the boom frame and the small arm frame decreases.

[0013] Preferably, an opening is provided in the middle of the hanging block to provide vertical penetration and horizontal clearance for the wire rope, the diameter of the opening is larger than the diameter of the wire rope, and a screw rod is connected to the threaded plug of the opening.

[0014] Preferably, a detection end of an overload limiter is fixedly installed through the middle of the U-shaped bracket plate, and an end of a steel wire rope is fixedly hung on the detection end of the overload limiter.

[0015] The advantages of this utility model compared with the prior art are:

[0016] The utility model discloses a lifting hook of crane's lifting stop device, and the stop device is by the way of the hanging block to identify the height where the hook is, and through the bending of big arm frame and small arm frame in the process of going up on the hanging block, triggers primary electric control switch and secondary electric control switch in proper order, controls winch power off or brake through the form control of double -stage insurance, avoids the collision of hook and crane girder or U type support board, also avoids the problem of the insufficient brake distance caused by the delay of power off, and the hook still hits in the crane girder or the lower part of U type support board because of the rising inertia. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0018] Figure 1 It is the three-dimensional structure schematic diagram (forward 45 DEG) of the utility model;

[0019] Figure 2 It is the three-dimensional structure schematic diagram (backward 45 DEG) of the utility model;

[0020] Figure 3 It is the stop non-triggering posture of the utility model;

[0021] Figure 4 It is the stop primary triggering posture of the utility model;

[0022] Figure 5 It is the stop secondary triggering posture of the utility model;

[0023] As shown in the figure: 1 - overload limiter; 2 - U type support board; 3 - steel wire rope; 4 - first electric control switch; 5 - big arm limit block; 6 - big arm frame; 7 - hanging block; 8 - screw rod; 9 - small arm frame; 10 - second electric control switch; 11 - limit pin; 12 - opening; 13 - supporting spring piece; 14 - main beam; 15 - hook. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as the limitation of the present application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] The present invention will be described in further detail below with reference to the accompanying drawings.

[0027] Combine Figures 1 to 4 The utility model provides a hook lifting stop device for a crane, comprising an overload limiter 1, wherein a hook 15 of the crane is hung on the middle section of a steel wire rope 3 through a movable pulley, one end of the steel wire rope is fixedly hung on the detection end of the overload limiter, and the other end of the steel wire rope is wound around and connected to a winch that provides lifting force for the crane;

[0028] The stop device includes a U-shaped bracket plate 2, a boom frame 6, a small arm frame 9 and a hanging block 7; the top, bottom and one side wall of the U-shaped bracket plate are open, an overload limiter is fixed on the middle outer wall of the U-shaped bracket plate, the interior of the U-shaped bracket plate is vertically penetrated and fixed with one end of the hanging wire rope, and the upper limit hinges on the outer walls of both sides of the U-shaped bracket plate are connected to the boom frame;

[0029] The bottom end of the big arm frame is limitedly hinged and connected to the small arm frame, and the bottom end pin of the small arm frame is rotatably connected to the hanging block;

[0030] The hanging block is radially limited and spaced outside the wire rope. The hanging block is lifted by the crane hook to provide upward movement force, and the hanging block is restrained by the boom frame and the jib frame to provide downward limit position.

[0031] A first electric control switch 4 is provided above the hinged connection between the boom frame and the U-shaped bracket plate, and a second electric control switch 10 is provided at the hinged connection between the boom frame and the arm frame. The first electric control switch and the second electric control switch are triggered by the change in the inclination attitude of the boom frame and the arm frame.

[0032] Preferably, the two back-facing side walls of the U-shaped bracket plate are hingedly connected to the middle section of the boom frame by pins, and the two back-facing side walls of the U-shaped bracket plate are fixed with a boom limit block 5 and a first electric control switch; the boom limit block constrains the maximum rotation angle of the top end of the boom frame for flipping downward; the first electric control switch constrains the maximum rotation angle of the top end of the boom frame for flipping upward.

[0033] Preferably, a second electric switch is fixed to the lower part of the boom frame, and a limit pin 11 is horizontally inserted into the bottom end of the boom frame; a supporting spring piece 13 is fixed to the upper part of the small arm frame, and the top end of the small arm frame is hingedly connected to the bottom end pin shaft of the boom frame, and the upper side wall of the small arm frame is constrained by the limit pin to limit the maximum rotation angle between the boom frame and the small arm frame; the supporting spring piece cooperates to support and trigger the second electric switch as the angle between the boom frame and the small arm frame decreases.

[0034] Preferably, an opening 12 is provided in the middle of the hanging block to provide vertical penetration and horizontal clearance for the wire rope. The diameter of the opening is larger than the diameter of the wire rope, and a screw rod 8 is connected to the threaded seal of the opening.

[0035] Preferably, a detection end of an overload limiter is fixedly installed through the middle of the U-shaped bracket plate, and an end of a steel wire rope is fixedly hung on the detection end of the overload limiter.

[0036] In addition, in the present invention, preferably, the overload limiter, the first electric-controlled switch and the second electric-controlled switch are all mature products in the existing technology.

[0037] The working principle of this utility model is:

[0038] The utility model provides a hook lifting stop device for a crane, which is fixed to the lower part of the main beam 14 of the crane by welding a U-shaped bracket plate, an overload limiter is fixed to the U-shaped bracket plate, and a detection end of the overload limiter penetrates the U-shaped bracket plate and is fixedly connected to a steel wire rope.

[0039] like Figure 3 The figure shows the stopper device in an untriggered position. At this point, the hook has not yet ascended to contact the bottom of the hanging block. The hanging block, under its own weight, drives the boom and arm frames to droop naturally. The boom and arm frames are bent, and the limit pins limit the angle between them. Furthermore, the top of the boom frame abuts against the first electrically controlled switch, while the supporting spring on the upper part of the arm frame does not trigger the second electrically controlled switch. Based on the on-off relationship between the first and second electrically controlled switches, it is determined that the hook has not ascended to contact the hanging block.

[0040] like Figure 4 As shown, this is the first-level trigger posture of the stop device. At this time, the hook drives the hanging block upward, and the hanging block drives the boom frame and the jib frame to bend further. At this time, the top of the boom frame is separated from the first electric control switch and constrained to be supported on the boom constraint block; the supporting spring at the top of the jib frame does not contact the second electric control switch; from the on-off relationship between the first electric control switch and the second electric control switch, it is judged that the upward position of the hook is close to the limit position at this time, and the winch can be controlled to cut off the power.

[0041] like Figure 5As shown, this is the second-level triggering posture of the stop device. At this time, the winch is powered off, and the hook continues to drive the hanging block upward by the rising inertia, driving the angle between the boom frame and the arm frame to further decrease until the supporting spring fits onto the second electric control switch. At this time, the first electric control switch is still in an untriggered posture. From the on-off relationship between the first electric control switch and the second electric control switch, it is judged that the upward position of the hook is the limit position at this time, and the winch brake can be controlled at this time.

[0042] The logical relationship table of the first electrically controlled switch and the second electrically controlled switch in the present utility model is as follows:

[0043] Serial number First electronically controlled switch Second electronically controlled switch Winch control status 1 trigger Not triggered Normal lifting operation 2 Not triggered Not triggered Power outage 3 Not triggered trigger brake

[0044] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A crane hook lift stop device, comprising an overload limiter, wherein the crane hook is connected to the middle section of a wire rope via a movable pulley, one end of the wire rope is fixedly connected to the detection end of the overload limiter, and the other end of the wire rope is wound around and connected to a winch that provides lifting force for the crane; Its characteristics are: The stop device includes a U-shaped bracket plate, a boom frame, a small arm frame and a hanging block; the top, bottom and one side wall of the U-shaped bracket plate are open, an overload limiter is fixed on the middle outer wall of the U-shaped bracket plate, the interior of the U-shaped bracket plate vertically penetrates and fixes one end of the hanging wire rope, and the upper limit hinges on the outer walls of both sides of the U-shaped bracket plate are connected to the boom frame; The bottom end of the big arm frame is limitedly hinged and connected to the small arm frame, and the bottom end pin of the small arm frame is rotatably connected to the hanging block; The hanging block is radially limited and spaced outside the wire rope. The hanging block is lifted by the crane hook to provide upward movement force, and the hanging block is restrained by the boom frame and the jib frame to provide downward limit position. A first electric control switch is provided above the hinged connection between the boom frame and the U-shaped bracket plate, and a second electric control switch is provided at the hinged connection between the boom frame and the arm frame. The first electric control switch and the second electric control switch are triggered by the change in the inclination attitude of the boom frame and the arm frame.

2. The hook lifting stop device of a crane according to claim 1, characterized in that: The two back-facing side walls of the U-shaped bracket plate are hingedly connected to the middle section of the boom frame by pins, and the two back-facing side walls of the U-shaped bracket plate are fixed with a boom limit block and a first electric control switch; the boom limit block constrains the maximum rotation angle of the top end of the boom frame for flipping downward; the first electric control switch constrains the maximum rotation angle of the top end of the boom frame for flipping upward.

3. The hook lifting stop device of a crane according to claim 1, characterized in that: A second electric-controlled switch is fixed to the lower part of the boom frame, and a limit pin is horizontally inserted at the bottom end of the boom frame; a supporting spring is fixed to the upper part of the small arm frame, the top end of the small arm frame is hingedly connected to the bottom end pin shaft of the boom frame, and the upper side wall of the small arm frame is constrained by the limit pin to limit the maximum rotation angle between the boom frame and the small arm frame; the supporting spring cooperates to support and trigger the second electric-controlled switch as the angle between the boom frame and the small arm frame decreases.

4. The hook lifting stop device of a crane according to claim 1, characterized in that: An opening is provided in the middle of the hanging block to provide vertical penetration and horizontal clearance for the wire rope. The diameter of the opening is larger than the diameter of the wire rope, and a screw rod is connected to the threaded plug of the opening.

5. The hook lifting stop device of a crane according to claim 1, characterized in that: The middle part of the U-shaped bracket plate is penetrated and fixed with a detection end of an overload limiter, and the detection end of the overload limiter is fixedly hung with an end of a steel wire rope.

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