Lifting hook lifting limiting device

Abstract

The utility model discloses a lifting hook lifting limiting device, which belongs to the technical field of winch lifting hooks, comprises a winch, a lifting hook arranged at the lower part of the winch, a winding drum arranged on the winch and a steel wire rope wound in the winding drum, and is characterized in that the tail end of the steel wire rope is also connected with a mounting seat; the lifting hook is rotatably connected to the lower part of the mounting seat, and a limiting assembly capable of limiting the lifting height of the lifting hook is also mounted on the mounting seat. After an upper contact plate is stressed, a spring is extruded, a lower contact plate connected to the spring moves downwards, the lower surface of the lower contact plate makes contact with a contact switch, after contact, a proximity switch sends out a signal, an electrified magnetic ball valve located at the position of a winding drum loses power, and a motor located at the position of the winding drum stops working. Therefore, even if the lifting operation is continued, the lifting hook does not do the lifting action, so that the purpose of limiting is achieved.

Description

A hook lifting limit device Technical Field

[0001] This utility model relates to the field of hook technology, specifically a hook lifting limit device. Background Technology

[0002] A winch is a small, lightweight lifting device that uses a drum to wind steel wire rope or chain to lift or pull heavy objects; it is also called a winch. Winches can lift vertically and pull heavy objects horizontally or at an angle. Winches are divided into three types: manual winches, electric winches, and hydraulic winches. Electric winches are the most common. They can be used independently or as components in lifting, road construction, and mine hoisting machinery. They are widely used due to their simple operation, large rope capacity, and ease of relocation. They are mainly used for lifting or dragging materials in construction, water conservancy projects, forestry, mining, and docks.

[0003] The hook is connected to the drum of a winch or jack via a wire rope. The drive unit moves the drum and wire rope so that the hook can be raised and lowered vertically to pull heavy objects.

[0004] However, the above design still has shortcomings. In the above design, no safety distance is set between the hook and the drum. In this way, the hook will be hit by the paper winding drum during the lifting process. Instead, a travel limit switch is only set at the drum. When the hook rises and hits the limit switch, the limit switch contacts close, and an electrical control signal is sent through the relay to the two-position two-way solenoid valve connected to the main air intake line of the pneumatic motor used to drive the winch. This de-energizes the valve and cuts off the air intake line of the pneumatic motor, thereby stopping the winch from rotating and stopping the hook from rising. This limit is not very effective and is also prone to collision between the hook and the winch housing or the drum, causing damage.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a spraying device for applying uncoated inner lightbox fabric, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a hook lifting limit device, comprising a winch and a hook disposed at the lower part of the winch, the winch also being provided with a drum, and a steel wire rope wound inside the drum, characterized in that the tail end of the steel wire rope is also connected to a mounting base, the hook is rotatably connected to the bottom of the mounting base, and the mounting base is also equipped with a limit component capable of limiting the lifting height of the hook.

[0008] As a further embodiment of this utility model: the limiting component includes a base, an upper contact plate, a lower contact plate, a spring, and a contact switch. The base is connected to the upper end of the mounting base. The upper contact plate is parallel to the top of the base. The contact switch is mounted on the upper surface of the base. The spring includes a first spring and a second spring. The upper end of the first spring is connected to the lower surface of the upper contact plate, and the lower end of the first spring is connected to the upper surface of the lower contact plate. The upper end of the second spring is connected to the lower surface of the lower contact plate, and the lower end of the second spring is connected to the upper surface of the base. The lower contact plate is located above the contact switch, and under the elastic force of the spring, the lower contact plate connected to the spring can contact the contact switch.

[0009] As a further embodiment of this utility model, the lower part of the drum is also provided with a limiting contact housing for contacting the upper contact plate.

[0010] As a further embodiment of this utility model: the upper surface of the base is also provided with an annular edge, and the interior of the connecting edge forms a mounting groove for the spring to be embedded.

[0011] As a further embodiment of this utility model: a sleeve is provided on the lower surface of the upper contact plate and the upper and lower surfaces of the lower contact plate; a spring is sleeved on the sleeve of the upper and lower contact plates; and a spring is sleeved in the mounting groove on the lower surface sleeve of the lower contact plate and the base.

[0012] As a further embodiment of this utility model: the base, the upper contact plate, and the lower contact plate are all provided with through holes in the middle for the steel wire rope to pass through.

[0013] As a further embodiment of this utility model, the contact switches are arranged in annular intervals on the upper surface of the base.

[0014] As a further embodiment of this utility model: a housing is also connected to the base, and a circular hole for the spring to pass through is opened in the middle of the housing, and the lower contact plate is located inside the housing.

[0015] As a further embodiment of this utility model: the upper surface of the upper contact plate is also connected to a limiting piece, the center of the limiting piece being aligned with the through hole at the center of the upper contact plate.

[0016] This utility model has the following beneficial effects:

[0017] Through the structural design of the base, upper contact plate, lower contact plate, spring, contact switch, and limiting contact housing located below the upper drum of the winch, the base is connected to the end of the wire rope, and the hook is rotatably connected to the lower part of the base. It can play a limiting role when the winch lifts the hook. During the lifting process, the hook and its connected mounting base are lifted slowly and synchronously. During the lifting process, the upper contact plate located above the mounting base will eventually abut against the limiting contact housing at the bottom of the winch, that is, the upper surface of the upper contact plate and the lower surface of the limiting contact housing. As the lifting continues slowly, the spring is stressed, that is, the upper contact plate is stressed and the spring is compressed, causing the lower contact plate connected to the spring to move downward, so that the lower surface of the lower contact plate comes into contact with the contact switch. After contact, the proximity switch sends a signal, which de-energizes the solenoid ball valve located at the drum, causing the motor located at the drum to stop working, that is, it is impossible to continue winding and lifting, but the wire can be unloaded to lower the bottom and the hook. In this way, even if the lifting operation continues, the hook will not lift, thus achieving the purpose of limiting.

[0018] The second spring is fitted into the mounting groove on the base. The lower end of the spring is fitted onto the sleeve of the lower contact plate, and the upper end of the spring is connected to the lower surface of the upper contact plate. The arrangement of the two springs can increase the stability of the lower contact plate contacting the contact switch.

[0019] The base is also equipped with a housing, and the lower contact plate and the contact switch are both located inside the housing. In other words, the lower contact plate moves up and down inside the housing, which can ensure that the lower contact plate makes stable and reliable contact with the contact switch under complex working conditions.

[0020] The upper contact plate, lower contact plate, and base are all provided with through holes for the wire rope to pass through, which facilitates the installation of the wire rope. A limit plate is also installed on the upper contact plate. The center of the limit plate is aligned with the through hole at the center of the upper contact plate. The size of the center of the limit plate is slightly larger than the size of the wire rope, which can limit the wire rope and effectively reduce the swaying of the wire rope between the upper and lower contact plates during lifting. Attached Figure Description

[0021] Figure 1 is a partial three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 is a schematic diagram of the structure of the hook and base of this utility model;

[0023] Figure 3 is a schematic diagram of the connection structure between the upper contact plate and the lower contact plate of this utility model;

[0024] Figure 4 is a schematic diagram of the structure between the lower contact plate and the spring of this utility model;

[0025] Figure 5 is a schematic diagram of the structure between the lower contact plate and the base of this utility model;

[0026] Figure 6 is a schematic diagram of the upper contact plate and limiting piece structure of this utility model.

[0027] In the diagram: 1; wire rope; 2; hook; 3; mounting base; 4; base; 4a; annular edge; 5; upper contact plate; 6; lower contact plate; 7; contact switch; 8; spring one; 9; spring two; 10; sleeve; 11; limit plate; 12; limit contact housing. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the present invention 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 the present invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please refer to Figures 1-5. One embodiment of this utility model provides a lifting and limiting device for a hook 2, comprising a winch and a hook 2 disposed at the lower part of the winch. The winch also has a drum, and a steel wire rope 1 is wound inside the drum. The characteristic feature is that the tail end of the steel wire rope 1 is connected to a mounting base 3. The hook 2 is rotatably connected to the bottom of the mounting base 3. The mounting base 3 is also equipped with a limiting component capable of limiting the lifting height of the hook 2. The limiting component includes a base 4, an upper contact plate 5, a lower contact plate 6, a spring, and a contact switch 7. The base 4 is connected to the upper end of the mounting base 3, and the upper contact plate 5 is arranged parallel to it. The contact switch 7 is mounted on the upper surface of the base 4 directly above the base 4. The spring includes a first spring 8 and a second spring 9. The upper end of the first spring 8 is connected to the lower surface of the upper contact plate 5, and the lower end of the first spring 8 is connected to the upper surface of the lower contact plate 6. The upper end of the second spring 9 is connected to the lower surface of the lower contact plate 6, and the lower end of the second spring 9 is connected to the upper surface of the base 4. The lower contact plate 6 is located above the contact switch 7. Under the elastic force of the spring, the lower contact plate 6 connected to the spring can contact the contact switch 7. The lower part of the drum is also provided with a limiting contact housing 12 for contacting the upper contact plate 5.

[0034] The base 4 is divided into an upper part and a lower part. The lower part is used to connect the hook 2, and the upper part is used to connect the wire rope 1. The external switch is divided into lifting and lowering. When the contact switch is touched, the lifting operation can not continue and can only be lowered. Lifting can only be carried out when the lower contact plate disengages from the release switch.

[0035] Specifically, as shown in Figures 1, 2, 4, and 5, a limiting contact housing 12 is also provided at the lower part of the winch. During operation, when the motor at the upper drum of the winch drives the drum, causing it to rotate, it drives the wire rope 1 wound on the drum. The base 4 and hook 2 connected to the end of the wire rope 1 are slowly lifted. After lifting, the upper contact plate 5 above the base 4 first contacts and abuts against the limiting contact housing 12 at the lower part of the winch. As lifting continues, the upper contact plate 5 is limited to the lower surface of the limiting contact housing 12. The base 4 and hook 2 continue to lift slowly. Under the action of springs 8 and 9, the lower contact plate 6 located directly below the upper contact plate 5 is compressed and displaced downwards, continuing slowly... As the lifting continues, the spring is compressed, causing the lower contact plate 6 connected to the spring to move downwards. Eventually, the lower surface of the lower contact plate 6 comes into contact with the contact switch 7 on the base 4. Upon contact, the proximity switch sends a signal, de-energizing the solenoid ball valve located at the drum. This causes the motor at the drum to stop working, preventing further winding and lifting. However, the line can still be unloaded, causing the bottom and hook 2 to descend. Thus, even if lifting continues, the hook 2 will not lift, achieving the limit and ensuring lifting safety. After descent, the spring returns to its original position, and the lower contact plate 6 disengages from the release switch, allowing for further lifting.

[0036] Specifically, the lower contact plate 6 is pressed downward by the spring, so that the lower contact plate 6 can touch the contact switch 7 on the base 4, which can cut off the power to the motor above.

[0037] Both the upper and lower surfaces of the lower contact plate 6 are provided with sleeves 10 for mounting spring 1 8 and spring 2 9. The upper surface of the base 4 also has an annular edge. The lower end of spring 2 9 is fitted into the mounting groove, and the upper end of spring 2 9 is fitted onto the outer wall of the sleeve 10 below the lower contact plate 6. By setting two springs, the stability of the lower contact plate 6 touching the contact switch 7 can be increased. The contact switches 7 are installed in annular intervals on the upper surface of the base 4. Both the lower contact plate 6 and the upper contact plate 5 are circular. In this way, through the compression of the springs, they can better contact the contact switches 7 that are annularly spaced on the base 4, increasing the contact stability.

[0038] A housing 12 is also installed on the base 4, which can protect the lower contact plate 6 and the contact switch 7, and prevent foreign objects from getting stuck or the contact switch 7 from being accidentally touched.

[0039] The base 4 is also provided with mounting holes. The mounting holes are on the same horizontal line as the through holes in the middle of the base 4, the upper contact plate 5, and the lower contact plate 6. The steel wire rope 1 can pass through in sequence and be wound and fixed in the mounting holes on the base 4.

[0040] The upper surface of the upper contact plate 5 is also connected to a limiting piece 11, which can limit the wire rope 1 and effectively reduce the swaying of the wire rope 1 between the upper contact plate 5 and the lower contact plate 6 during lifting.

[0041] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. At the same time, the electrical components mentioned in this application are all connected to an external power supply and control switch when in use. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Therefore, this utility model will not explain the control method and circuit connection in detail. Moreover, the external controller mentioned in the specification can play a control role for the electrical components mentioned in this article, and the external controller is a conventional known device.

[0042] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above are only preferred embodiments of this utility model. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A lifting and limiting device for a hook, comprising a winch and a hook disposed at the lower part of the winch, wherein the winch is further provided with a drum, and a steel wire rope is wound inside the drum, characterized in that, The end of the wire rope is also connected to a mounting base, and the hook is rotatably connected to the bottom of the mounting base. The mounting base is also equipped with a limiting component that can limit the lifting height of the hook.

2. The lifting and limiting device for a hook according to claim 1, characterized in that: The limiting assembly includes a base, an upper contact plate, a lower contact plate, a spring, and a contact switch. The base is connected to the upper end of the mounting base. The upper contact plate is parallel to the top of the base. The contact switch is mounted on the upper surface of the base. The spring includes a first spring and a second spring. The upper end of the first spring is connected to the lower surface of the upper contact plate, and the lower end of the first spring is connected to the upper surface of the lower contact plate. The upper end of the second spring is connected to the lower surface of the lower contact plate, and the lower end of the second spring is connected to the upper surface of the base. The lower contact plate is located above the contact switch, and under the elastic force of the spring, the lower contact plate connected to the spring can contact the contact switch.

3. The lifting and limiting device for a hook according to claim 2, characterized in that: The lower part of the drum is also provided with a limiting contact housing for contacting the upper contact plate.

4. The lifting and limiting device for a hook according to claim 3, characterized in that: The upper surface of the base is also provided with an annular edge, and the interior of the annular edge forms a mounting groove for the spring to be embedded.

5. The lifting and limiting device for a hook according to claim 4, characterized in that: The lower surface of the upper contact plate and the upper and lower surfaces of the lower contact plate are both provided with sleeves. Spring 1 is installed on the sleeves of the upper and lower contact plates, and spring 2 is installed in the mounting groove on the lower surface sleeve of the lower contact plate and the base.

6. The lifting and limiting device for a hook according to claim 5, characterized in that: The base, upper contact plate, and lower contact plate all have through holes in the middle for the steel wire rope to pass through.

7. A hook lifting limiting device according to claim 6, characterized in that: The contact switches are arranged in annular intervals on the upper surface of the base.

8. A hook lifting limiting device according to claim 7, characterized in that: The base is also connected to a housing, and a circular hole is opened in the middle of the housing for the spring to pass through. The lower contact plate is located inside the housing.

9. A hook lifting limiting device according to claim 8, characterized in that: The upper surface of the upper contact plate is also connected to a limiting piece, the center of which is aligned with the through hole at the center of the upper contact plate.

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