Wire breakage protection device for winches

Abstract

This utility model relates to a wire rope breakage protection device for winches, belonging to the technical field of winches. It senses tension through a rotatable arm and rollers mounted on the wire rope path; when the wire rope breaks, the arm rotates under its own weight and triggers a limit switch, immediately cutting off the motor power and preventing excessive winding and damage to the winch drum. Simultaneously, the use of a flexible coupling to connect the transmission system compensates for shaft misalignment, improves transmission performance, and extends the equipment's lifespan.

Description

Technical Field

[0001] This utility model relates to the field of winch technology, and in particular to a wire breakage protection device for winches. Background Technology

[0002] With the development of lifting technology, winch equipment came into being.

[0003] In related technologies, the focus is often on controlling the hoisting process, but there is a lack of protection measures when the wire rope breaks. Once the wire rope suddenly breaks, the instantaneous loss of tension cannot be effectively detected. The hoisting drum continues to rotate at high speed under the power drive, causing the remaining wire rope to accumulate disorderly and become over-wound on the drum, which in turn leads to drum structure deformation, bearing damage, or even transmission system failure. Utility Model Content

[0004] In view of the shortcomings of the existing production technology, the applicant provides a wire breakage protection device for winches, which realizes rapid power cut-off in the event of wire breakage, thereby protecting the winch drum.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A wire breakage protection device for a winch includes a winch lifting assembly and a protection assembly;

[0007] The hoisting assembly includes an electric motor, the output end of which is connected in sequence to a brake and a reducer. The reducer is connected to the hoisting shaft via a coupling. One end of the hoisting shaft is provided with a bearing seat, and a hoisting drum is sleeved on the hoisting shaft. The wire rope outside the hoisting drum cooperates with the protection assembly.

[0008] The protective assembly includes a support base, the top of which is rotatably connected to a rotating arm via a connecting shaft. A first roller and a second roller are spaced apart on the rotating arm, and a steel wire rope passes between the first roller and the second roller. A mounting base is provided on one side of the support base, and a limit switch is provided on the mounting base.

[0009] When the wire rope breaks, the boom rotates around the connecting shaft under its own weight and triggers the limit switch, which is used to cut off the power supply.

[0010] As a further improvement to the above technical solution:

[0011] In one embodiment, the coupling is configured as a flexible coupling.

[0012] In one embodiment, the rotating arm has an L-shaped structure, including a vertical section and a horizontal section, with the horizontal section located at the top of the vertical section; wherein, the vertical section is rotatably connected to the top of the support base via the connecting shaft, and the first roller and the second roller are spaced apart on the horizontal section.

[0013] In one embodiment, the axes of the first roller and the second roller are parallel to each other and both are perpendicular to the vertical segment of the rotating arm.

[0014] In one embodiment, the mounting base is a plate structure, with one end fixed to the support base and the limit switch provided on the surface of the other end.

[0015] In one embodiment, the swing arm is positioned above the limit switch when the wire rope is intact, and there is a gap between the swing arm and the limit switch.

[0016] In one embodiment, the support base has mounting holes at its bottom for securing the entire protective assembly to the base of the winch.

[0017] In one embodiment, the limit switch is electrically connected to the control circuit of the motor via a wire.

[0018] In one embodiment, when the wire rope is broken, the boom rotates and falls toward the limit switch under its own weight until the boom contacts the limit switch and causes the limit switch to bend and trigger. The limit switch shuts off the power based on the motor's control circuit to prevent the winch drum from being damaged due to excessive winding.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model has a compact structure and utilizes the cooperation of the rotating arm and roller with the limit switch to form a mechanically triggered power-off mechanism. When the wire rope breaks and the tension is lost instantly, the rotating arm will immediately rotate under its own gravity, triggering the limit switch and cutting off the power to the motor. This response is instantaneous and reliable, which can fundamentally avoid excessive winding of the winch drum and structural damage caused by the delayed response of the control system after the wire rope breaks.

[0021] This utility model also has the following advantages:

[0022] This invention sets an elastic coupling between the winch shaft and the reducer. The elastic coupling can effectively compensate for axial, radial and angular offsets caused by manufacturing errors, installation deviations or long-term wear, absorb shock and vibration, significantly reduce the additional load on the transmission components, thereby reducing wear, avoiding "seizing" phenomenon, extending the service life of key components such as reducer, bearings and shaft, and reducing maintenance difficulty and cost. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the state of the steel wire rope when it is not broken.

[0025] Figure 3 This is a schematic diagram of the state of the steel wire rope when it breaks according to this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the protective component of this utility model.

[0027] Among them: 100, electric motor; 200, brake; 300, reducer; 400, coupling; 500, bearing housing; 600, winch shaft; 700, winch drum; 800, protection components; 900, wire rope;

[0028] 810, Support base; 820, Rotary arm; 830, Connecting shaft; 840, First roller; 850, Second roller; 860, Mounting base; 870, Limit switch. Detailed Implementation

[0029] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0030] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0033] It should be understood that although the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0034] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0035] like Figures 1-4 The accompanying drawing shows a schematic diagram of the structural state of a wire breakage protection device for a winch according to an embodiment of the present invention; for ease of description, the drawing only shows the structure related to the embodiment of the present invention.

[0036] This application provides a wire breakage protection device for a winch, including a winch lifting assembly and a protection assembly 800.

[0037] In some embodiments, the hoisting assembly is the power actuator of the hoist, including an electric motor 100 as a power source, and the output shaft of the electric motor 100 is connected to the input end of the brake 200 via a key connection.

[0038] The output end of the brake 200 is connected to the input shaft of the reducer 300, which is used to reduce the speed and increase the output torque.

[0039] The output end of the reducer 300 is connected to one end of the hoist shaft 600 via a coupling 400.

[0040] Furthermore, the coupling 400 specifically adopts an elastic coupling, such as a plum blossom-shaped elastic coupling. Its internal elastic element can effectively compensate for the radial, axial and angular deviations that may exist between the output shaft of the reducer 300 and the hoist shaft 600, absorb vibration and impact in the transmission, thereby improving transmission performance and extending equipment life.

[0041] The other end of the winch shaft 600 is supported by a bearing housing 500, which contains a rolling bearing to ensure that the winch shaft 600 can rotate freely. A winch drum 700 is fixedly mounted on the winch shaft 600 for winding the wire rope 900 for lifting heavy objects.

[0042] In some embodiments, the function of the protection component 800 is to immediately perform a protective action when the wire rope 900 breaks.

[0043] Furthermore, the protection component 800 is fixedly installed on the winch frame at an appropriate position using fasteners such as bolts through the mounting holes at the bottom of its support base 810, ensuring that the wire rope 900 can pass through it; the support base 810 is a cast or welded component, and a freely rotatable swing arm 820 is hinged to its top via a connecting shaft 830; in this embodiment, the swing arm 820 is designed as an L-shaped structure, which consists of a vertical section and a horizontal section located at the top of the vertical section, wherein the lower end of the vertical section of the swing arm 820 is rotatably connected to the support base 810 through a bushing or bearing sleeved on the connecting shaft 830;

[0044] Furthermore, on the horizontal section of the rotating arm 820, a first roller 840 and a second roller 850 are installed parallel to each other at a certain distance, with the axes of the two rollers being parallel to each other and both perpendicular to the vertical section of the rotating arm 820.

[0045] After the wire rope 900 is led out from the winch drum 700, it passes through the gap between the first roller 840 and the second roller 850.

[0046] During normal operation, the tensioned wire rope 900 supports the horizontal section of the boom 820 upwards, enabling it to overcome its own weight and maintain a raised, balanced position.

[0047] A mounting base 860 is fixedly installed on one side of the top of the support base 810. The mounting base 860 can be a steel plate, with one side of its plate fixed to the side of the support base 810 and the other side of its plate extending toward the vertical section of the swing arm 820. A limit switch 870 is installed on this extended plate.

[0048] Limit switch 870 is connected to the main control circuit or emergency stop circuit of motor 100 via a wire.

[0049] In practical applications, the working principle of this utility model is as follows:

[0050] Under normal conditions where the wire rope 900 is not broken, a safe gap is maintained between the vertical section of the swing arm 820 and the trigger arm or pressing head of the limit switch 870 to ensure that it is not accidentally triggered.

[0051] When the wire rope 900 suddenly breaks due to an accident, its supporting force on the first roller 840 and the second roller 850 disappears instantly.

[0052] by Figure 2 , Figure 3 Taking the perspective as an example, under the action of its own gravity torque, the rotating arm 820 immediately rotates clockwise around the connecting shaft 830 and falls; the vertical part of the rotating arm 820 then swings downward, impacting and pressing the triggering mechanism of the limit switch 870, causing it to bend.

[0053] When the limit switch 870 is triggered, the state of its internal contacts changes, thereby cutting off the power supply circuit to the motor 100.

[0054] The motor 100 immediately stops running, and the brake 200 linked to it also quickly engages due to power loss, causing the entire hoisting system to stop working. This effectively prevents serious consequences such as disorderly accumulation of wire rope 900, tangled rope, or even damage to the hoisting drum 700 and transmission system caused by the hoisting drum 700 continuing to rotate at high speed under power drive after the wire breaks.

[0055] After troubleshooting, the operator only needs to re-thread the wire rope 900 and manually lift the boom 820 back to the initial working position, then re-thread the wire rope 900 between the first roller 840 and the second roller 850. The limit switch 870 will automatically reset, and the device will return to normal standby status.

[0056] In summary, this utility model utilizes the cooperation of the rotating arm 820, the first roller 840, the second roller 850, and the limit switch 870 to form a mechanically triggered power-off mechanism. When the wire rope 900 breaks and the tension is lost instantaneously, the rotating arm 820 will immediately rotate under its own gravity, triggering the limit switch 870 and cutting off the power supply to the motor 100. This response is instantaneous and reliable, which can fundamentally avoid excessive winding and structural damage to the winch drum 700 caused by the delayed response of the control system after the wire breakage.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above merely illustrate the implementation of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A wire breakage protection device for a winch, characterized in that, Includes hoisting assembly and protection assembly (800); The hoisting assembly includes a motor (100), the output end of which is connected in sequence to a brake (200) and a reducer (300). The reducer (300) is connected to the hoisting shaft (600) via a coupling (400). One end of the hoisting shaft (600) is provided with a bearing seat (500), and a hoisting drum (700) is sleeved on the hoisting shaft (600). A wire rope (900) outside the hoisting drum (700) cooperates with a protective assembly (800). The protection component (800) includes a support base (810), and a rotating arm (820) is rotatably connected to the top of the support base (810) via a connecting shaft (830). A first roller (840) and a second roller (850) are spaced apart on the rotating arm (820), and a steel wire rope (900) passes between the first roller (840) and the second roller (850). A mounting base (860) is provided on one side of the support base (810), and a limit switch (870) is provided on the mounting base (860). When the wire rope (900) breaks, the swing arm (820) rotates around the connecting shaft (830) under its own weight and triggers the limit switch (870), which is used to cut off the power supply.

2. The wire breakage protection device for a winch according to claim 1, characterized in that, The coupling (400) is configured as a flexible coupling.

3. The wire breakage protection device for a winch according to claim 1, characterized in that, The rotating arm (820) has an L-shaped structure, including a vertical section and a horizontal section, with the horizontal section located at the top of the vertical section; The vertical section is rotatably connected to the top of the support base (810) via the connecting shaft (830), and the horizontal section is provided with the first roller (840) and the second roller (850) at intervals.

4. The wire breakage protection device for a winch according to claim 3, characterized in that, The axes of the first roller (840) and the second roller (850) are parallel to each other and are both perpendicular to the vertical section of the rotating arm (820).

5. The wire breakage protection device for a winch according to claim 1, characterized in that, The mounting base (860) is a plate structure, with one end fixed to the support base (810) and the limit switch (870) provided on the surface of the other end.

6. The wire breakage protection device for a winch according to claim 1, characterized in that, When the wire rope (900) is intact, the swing arm (820) is positioned above the limit switch (870) and has a gap between it and the limit switch (870).

7. The wire breakage protection device for a winch according to claim 1, characterized in that, The support base (810) has mounting holes at the bottom for fixing the entire protection assembly (800) to the base of the winch.

8. The wire breakage protection device for a winch according to claim 1, characterized in that, The limit switch (870) is electrically connected to the control circuit of the motor (100) via a wire.

9. The wire breakage protection device for a winch according to claim 8, characterized in that, When the wire rope (900) is broken, the boom (820) rotates and falls toward the limit switch (870) under its own weight until the boom (820) touches the limit switch (870) and causes the limit switch (870) to bend and trigger. The limit switch (870) shuts off the power based on the control circuit of the motor (100) to prevent the winch drum (700) from being damaged due to excessive winding.

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