Line pipe type limiting device for lifting hook

Abstract

The utility model provides a line pipe type limit device for lifting hook, including control device, limit device and mobile device, the control device includes: box, travel switch, swing link, motion block, first rigid member, spring mounting seat and spring, the spring mounting seat is fixed in the box, spring one end is connected with the spring mounting seat, and the limit device is fixed in the box. The other end of the spring is connected with the first rigid piece, the first rigid piece is fixedly connected with the moving block, the travel switch is fixedly installed in the box body, one end of the swing rod is hinged to the moving block, the other end of the swing rod is hinged to the box body, the limiting device comprises a limiting base and a limiting shaft, and the first rigid piece penetrates through the limiting base to be connected with the limiting shaft. And the limiting shaft is movably arranged on the limiting seat and connected with the moving device, and the device is simple in structure, convenient to maintain and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting hooks, in particular to a tube - type limiting device for a lifting hook. Background Art

[0002] With the development of production and the progress of technology, in the application of lifting equipment, the requirement for the degree of automation is increasing day by day. When the lifting hook is operating, in order to ensure safety, an upward limit setting is usually carried out on the lifting hook to prevent the lifting hook from over - stepping and damaging the lifting equipment. Usually, a travel switch and an induction block are set on the crane. When the lifting hook contacts the induction block, the travel switch is driven to move to complete the upward limit of the lifting hook. However, the travel switch is exposed outside the crane and is easily wetted by rainwater, resulting in the travel switch being insensitive and prone to accidents.

[0003] For example, in the patent document with the patent application number CN202222968419.9 and the publication date of November 8, 2022, an upper limit protection device is disclosed, which is used to be set between the boom and the lifting hook. It includes a weight, a travel switch, a first rigid member and a second rigid member. The travel switch is set on the boom. One end of the first rigid member is connected to the weight, the other end of the first rigid member is connected to the travel switch, one end of the second rigid member is connected to the boom, the other end of the second rigid member is connected to the weight, and the weight is set between the boom and the lifting hook. When the first rigid member is in a tension state, the travel switch is not opened and the second rigid member is in a relaxed state. When the first rigid member is in a relaxed state, the travel switch is opened. Using the above - mentioned device, it is convenient to repair the limit structure.

[0004] In the above - mentioned literature, the travel switch is exposed on the lifting equipment and is easily affected by rainwater. In a humid environment, if the wire is exposed in water, moisture may invade the inside of the wire, resulting in short - circuit and even electric shock risks, causing the wire to age and be damaged, further increasing the risk of safety accidents. At the same time, in this structure, since the travel switch is directly connected to the weight through one end of the steel wire rope and the other end of the steel wire rope is connected to the travel switch, and the travel switch is triggered by hitting the weight. When the weight drops under a strong impact force, it directly pulls the travel switch, which is likely to cause damage to the travel switch. And due to the need to ensure the vertically lifted form of the weight, the installation position of the travel switch is restricted. Summary of the Invention

[0005] The utility model provides a tube - type limiting device for a lifting hook, by setting the travel switch and the elastic member in a box body, which has a long service life and can adapt to the installation at different boom positions.

[0006] To achieve the above object, the technical solution of the present utility model is: a wire tube type limit device for a lifting hook, comprising a control device, a limit mechanism and a moving device. The control device includes a box body, a travel switch, a swing rod, a moving block, a first rigid member, an elastic member mounting seat and an elastic member. The elastic member mounting seat is fixedly installed in the box body. One end of the elastic member is connected to the elastic member mounting seat, and the other end of the elastic member is connected to the first rigid member. The first rigid member is fixedly connected to the moving block. The travel switch is fixedly installed in the box body. One end of the swing rod is hinged to the moving block, and the other end of the swing rod is hinged to the box body. One end of the first rigid member passes through the limit mechanism and is connected to one end of the limit mechanism, and the other end of the limit mechanism is rotatably connected to the moving device.

[0007] With the above settings, the travel switch, the moving block and the elastic member are arranged in the box body, which can effectively prevent dust and moisture from invading. Moreover, the box body provides a solid shell for the travel switch, which can avoid damage caused by external force impact or extrusion. The displacement of the first rigid member drives the swing rod to move, so that the swing rod contacts the travel switch, and the crane receives the travel switch signal and stops the lifting hook from moving upward, completing the upward limit setting for the lifting hook. Through the setting of the box body and the elastic member, the first rigid member is not directly connected to the travel switch, preventing damage to the travel switch, and it is also convenient to install through the box body. And a limit mechanism is arranged between the moving device and the box body, and the other end of the limit mechanism is rotatably connected to the moving device. Thus, it is not necessary to make the first rigid member perpendicular to the moving device, and the installation position can be conveniently selected through the moving device and the limit mechanism, and installation at different installation positions can be achieved.

[0008] Further, the limit mechanism includes a limit seat and a limit shaft. The first rigid member passes through the limit seat and is connected to one end of the limit shaft. The limit shaft is slidably connected to the limit seat, and the other end of the limit shaft is rotatably connected to the moving device.

[0009] With the above settings, through the setting of the limit seat, the installation of the limit mechanism can be conveniently achieved through the limit seat, and at the same time, the limit shaft can be conveniently connected to the moving device.

[0010] Further, the elastic member and the travel switch are arranged in parallel in the box body. The first rigid member drives the moving block to perform a linear motion, and the moving member drives the swing rod to perform an arc motion.

[0011] With the above settings, the swing rod changes the linear motion of the moving member into an arc motion. The arc motion of the swing rod can control the travel switch. By the contact between the swing rod and the travel switch, the moving block is prevented from directly contacting the travel switch, reducing the instantaneous stress brought by the movement of the moving block, reducing mechanical wear and improving the transmission efficiency.

[0012] Further, the first rigid member is a wire rope, and wire rope fasteners are provided at the connection between the first rigid member and the elastic member, at the connection between the first rigid member and the moving block, and at the connection between the first rigid member and the limit shaft.

[0013] With the above settings, using wire rope fasteners can effectively improve the connection force at the connection of the wire rope, prevent the wire rope from sliding in the fastener, and avoid the situation where the connection between the wire rope and the elastic member cannot transmit the force to the connection between the wire rope and the moving block due to its own sliding, resulting in inaccurate movement distance of the moving block and thus affecting the movement of the swing rod.

[0014] Further, the limit seat includes a limit seat body and limit plates provided on both sides of the limit seat body. The limit plates are perpendicular to the limit seat body. An installation hole is provided on the limit seat body, a groove is provided on one limit plate, and a through hole is provided on the other limit plate.

[0015] With the above settings, installation holes are respectively provided at the four corners of the limit seat body, and the limit seat can be fixedly installed on the crane boom through the installation holes. The settings of the groove and the through hole can reduce the impact force of the limit shaft on the limit seat when the limit shaft moves upward, thereby protecting the limit seat.

[0016] Further, a disc is provided on the limit shaft, and the disc abuts against the other limit plate. Connection holes are respectively provided at both ends of the disc.

[0017] With the above settings, the limit of the displacement of the moving device is achieved through the disc on the limit shaft, the displacement range of the limit shaft is clarified, and the gravity of the moving device is mainly borne by the disc, so that the moving device naturally hangs down by gravity, and the disc prevents the limit shaft from detaching from the limit seat.

[0018] Further, the moving device includes a second rigid member, a third rigid member, a fourth rigid member, a buckle, and a weight. One end of the second rigid member is connected to the limit shaft, and the other end of the second rigid member is connected to the buckle. One end of the third rigid member and the fourth rigid member is connected to the buckle, and the other end of the third rigid member and the fourth rigid member is connected to the weight.

[0019] With the above settings, the second rigid member is connected to the limit shaft. When the height of the weight needs to be changed, the height of the weight can be changed by changing the length of the second rigid member. The second rigid member is connected to the third rigid member and the fourth rigid member through the buckle, and the third rigid member and the fourth rigid member are connected to the center of the circumference of the weight relatively, ensuring that the weight is in a horizontal position and avoiding the inclination of the weight.

[0020] Further, a wire management pipe is provided for the limit mechanism and the control device. The first rigid member is movably arranged in the wire management pipe. Limit protrusions are provided at both ends of the wire management pipe, and both ends of the wire management pipe are installed in the grooves of the control device and the limit mechanism through the limit protrusions.

[0021] With the above settings, according to the different boom configurations, the limit mechanism and the control device can be installed at different positions. Then, through the installation conduit, the protection of the first rigid member between the limit mechanism and the control device can be achieved, preventing the first rigid member from being affected by the outside world. At the same time, it is also convenient to fix the first rigid member through the installation conduit to avoid other installed components when setting up at different installation positions.

[0022] Furthermore, the moving device further includes a fifth rigid member. One end of the fifth rigid member is connected to the boom, and the other end of the fifth rigid member passes through the plumb bob and is connected to the hook.

[0023] With the above settings, when the plumb bob hangs down due to gravity, if the plumb bob flutters with the wind due to excessive wind force, when the hook is rising and reaches the limit position but does not touch the plumb bob and does not trigger the travel switch, the hook continues to rise, resulting in an accident. The position of the plumb bob can be limited by the fifth rigid member to ensure that the plumb bob is above the hook and prevent the plumb bob from fluttering with the wind.

[0024] Furthermore, the second rigid member, the third rigid member, and the fourth rigid member rely on the gravity of the plumb bob to hang down and maintain a tensioned state.

[0025] With the above settings, the second rigid member, the third rigid member, and the fourth rigid member are kept in a tensioned state by the plumb bob, so that the disc on the limit shaft abuts against the bottom of the limit seat, and the first rigid member stretches the elastic member under force, causing the travel switch not to contact the swing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the front view of a wire tube type limit device of the present utility model.

[0027] Figure 2 It is Figure 1 The enlarged view at A in

[0028] Figure 3 It is the front view of the limit seat in the present utility model.

[0029] Figure 4 It is the side view of the limit seat in the present utility model.

[0030] Figure 5 It is the front view of the moving device in the present utility model.

[0031] Figure 6 It is the schematic diagram of the application of the present utility model on the boom and the hook.

[0032] Figure 7 It is Figure 6 The enlarged view at B in

[0033] Figure 8 It is Figure 6 The enlarged view at C in

[0034] 1 - Control device; 11 - Elastic member mounting seat; 12 - Elastic member; 13 - Steel wire rope buckle; 14 - First rigid member; 15 - Moving block; 16 - Swing rod; 17 - Travel switch; 18 - Box body; 2 - Limiting mechanism; 21 - Mounting hole; 22 - Groove; 23 - Limiting seat; 231 - Limiting seat body; 232 - Limiting plate; 2321 - Through hole; 24 - Limiting shaft; 25 - Disc; 3 - Moving device; 31 - Second rigid member; 32 - Buckle; 33 - Third rigid member; 34 - Fourth rigid member; 35 - Plumb bob; 4 - Cable conduit; 41 - Limiting projection. Specific embodiments

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] As Figures 1 to 5 shown, a wire - tube type limiting device for a lifting hook includes a control device 1, a limiting device 2, and a moving device 3. The control device 1 includes a box body 18, a travel switch 17, a swing rod 16, a moving block 15, a first rigid member 14, an elastic member mounting seat 11, and an elastic member 12. The elastic member mounting seat 11 is fixedly installed in the box body 18. One end of the elastic member 12 is connected to the elastic member mounting seat 11, and the other end of the elastic member 12 is connected to the first rigid member 14. The first rigid member 14 is fixedly connected to the moving block 15. The travel switch 17 is fixedly installed in the box body 18. One end of the swing rod 16 is hinged to the moving block 15, and the other end of the swing rod 16 is hinged to the box body 18. The elastic member 12 is horizontally installed in the box body 18, and the travel switch 17 is horizontally installed in the box body 18. In this embodiment, the elastic member 12 is a spring.

[0037] As Figure 2 shown, the first rigid member 14 drives the moving member to perform a linear motion, and the moving member drives the swing rod 16 to perform an arc motion. The swing rod 16 changes the linear motion of the moving member into an arc motion. The arc motion of the swing rod 16 can control the travel switch 17. By avoiding the direct contact between the moving block 15 and the travel switch 17 through the contact between the swing rod 16 and the travel switch 17, the instantaneous stress brought by the movement of the moving block 15 is reduced, mechanical wear is decreased, and the transmission efficiency is improved.

[0038] As Figure 2 and Figure 3As shown, the first rigid member 14 is a wire rope. Wire rope locks 13 are provided at the connection between the first rigid member 14 and the elastic member 12, at the connection between the first rigid member 14 and the moving block 15, and at the connection between the first rigid member 14 and the limit shaft 24. Using wire rope locks 13 can effectively improve the connection force at the connection of the wire rope, prevent the wire rope from sliding in the lock, and avoid the situation where the connection between the wire rope and the elastic member 12 cannot transmit the force to the connection between the wire rope and the moving block 15 due to its own sliding, resulting in inaccurate movement distance of the moving block 15, thereby affecting the movement of the swing rod 16.

[0039] As Figure 1 and Figure 3 As shown, the limiting device 2 includes a limit seat 23 and a limit shaft 24. The first rigid member 14 passes through the limit seat 23 and is connected to the limit shaft 24. The limit shaft 24 is movably arranged on the limit seat 23, and the limit shaft 24 is rotatably connected to the moving device.

[0040] As Figure 3 and Figure 4 As shown, the limit seat 23 includes a limit seat body 231 and limit plates 232. The limit plates 232 are located on both sides of the limit seat body 231. The limit seat body 231 is provided with mounting holes 21. A groove 22 is provided on one limit plate 232, and a through hole 2321 is provided on the other limit plate 232. Mounting holes 21 are respectively provided at the four corners of the limit seat body 231 itself. The limit seat 23 can be fixedly installed on the crane boom through the mounting holes 21. The setting of the groove 22 on the limit seat 23 can reduce the impact force of the limit shaft 24 on the limit seat 23 when the limit shaft 24 moves upward, thereby protecting the limit seat 23.

[0041] The limit shaft 24 is provided with a disc 25. The disc 25 abuts against the bottom of the limit seat 23. The limit shaft 24 limits the displacement of the moving device 3 through the disc 25, clarifies the displacement range of the limit shaft 24, and mainly bears the gravity of the moving device 3 through the disc 25, so that the moving device 3 naturally hangs down by gravity. The disc 25 prevents the limit shaft 24 from detaching from the limit seat 23.

[0042] Connection holes are provided at both ends of the disc 25. The other end of the first rigid member is connected to the connection hole, and the moving device is rotatably connected to the connection hole.

[0043] As Figure 5As shown, there are a second rigid member 31, a third rigid member 33, a fourth rigid member 34, a buckle 32 and a plumb bob 35. One end of the second rigid member 31 is connected to the limit shaft 24, and the other end of the second rigid member 31 is connected to the buckle 32. One end of the third rigid member 33 and the fourth rigid member 34 is connected to the buckle 32, and the other end of the third rigid member 33 and the fourth rigid member 34 is connected to the plumb bob 35. The second rigid member 31 is connected to the limit shaft 24. When the height of the plumb bob 35 needs to be changed, the height of the plumb bob 35 can be changed by changing the length of the second rigid member 31. The second rigid member 31 is connected to the third rigid member 33 and the fourth rigid member 34 through the buckle 32. The third rigid member 33 and the fourth rigid member 34 are connected to the circumferential center of the plumb bob 35 relatively, ensuring that the plumb bob 35 is in a horizontal position and avoiding the inclination of the plumb bob 35.

[0044] The moving device 3 further includes a fifth rigid member. One end of the fifth rigid member (not shown in the figure) is connected to the boom, and the other end of the fifth rigid member (not shown in the figure) passes through the plumb bob 35 and is connected to the hook. When the plumb bob 35 hangs down due to gravity, if the plumb bob 35 flutters with the wind due to excessive wind force, when the hook is rising and reaches the limit position without touching the plumb bob 35 and without triggering the travel switch 17, the hook continues to rise, resulting in an accident. The position of the plumb bob 35 can be limited through the fifth rigid member (not shown in the figure) to ensure that the plumb bob 35 is above the hook and prevent the plumb bob 35 from fluttering with the wind.

[0045] The second rigid member 31, the third rigid member 33 and the fourth rigid member 34 rely on the gravity of the plumb bob 35 to hang down and maintain a tightened state. The second rigid member 31, the third rigid member 33 and the fourth rigid member 34 are kept in a tightened state through the plumb bob 35, so that the disk 25 on the limit shaft 24 abuts against the bottom of the limit seat 23, and the first rigid member 14 is stretched to act on the elastic member 12, so that the travel switch 17 does not contact the swing rod 16.

[0046] Such as Figure 1 、 6 As shown in Fig. -8, a wire installation pipe is provided between the limit mechanism 2 and the control device 11. The first rigid member is movably arranged in the wire installation pipe 4. Limit protrusions 41 are provided at both ends of the wire installation pipe 4, and both ends of the wire installation pipe 4 are installed in the grooves of the control device 11 and the limit mechanism 2 through the limit protrusions 41. In this embodiment, the wire installation pipe 4 is made of a flexible material.

[0047] The limit mechanism 2 and the control device 11 can be installed at different positions according to the boom 01. According to the difference of the boom 01, the limit device 2 and the control device 11 can be installed at different positions, and then the wire installation pipe 4 is used to realize the setting of bypassing other components on the boom, such as Figure 6 and 7As shown, there are different bending methods of the pipe installation line 4 at different installation positions, enabling the limit device 2 and the control device 1 to be set according to different boom configurations and operate properly, then connecting the lifting hook 02 and installing it at a convenient maintenance position, with a simple structure.

[0048] The working principle of the present utility model: During the hoisting operation, when the lifting hook 01 does not touch the weight 35, the lifting hook 01 can continue to rise. At this time, the second rigid member 31, the third rigid member 33, and the fourth rigid member 34 rely on the gravity of the weight 35 to hang down, causing the first rigid member 14 to remain in a tensioned state. The first rigid member 14 drives the moving block 15 away from the travel switch 17. When the lifting hook reaches the limit position and touches the weight 35, the gravity of the weight 35 that is supported by the lifting hook decreases. The pulling forces of the weight 35 on the second rigid member 31, the third rigid member 33, and the fourth rigid member 34 decrease. At this time, the second rigid member 31, the third rigid member 33, and the fourth rigid member 34 are suspended and not tightened. The elastic member 12 drives the first rigid member 14 to move towards the mounting seat 11 of the elastic member 12. The moving block 15 drives the swing rod 16 to touch the travel switch 17 under the movement of the first rigid member 14. The travel switch 17 emits a signal, and the lifting hook stops rising, completing the limit operation of the lifting hook.

[0049] Setting the travel switch 17, the moving block 15, and the elastic member 12 inside the box body 18 can effectively prevent dust and moisture from entering. Moreover, the box body 18 provides a sturdy outer shell for the travel switch 17, capable of avoiding damage caused by external impact or extrusion. Through the displacement of the first rigid member 14, the swing rod 16 is driven to move, causing the swing rod 16 to contact the travel switch 17. The crane receives the signal from the travel switch 17 and stops the upward movement of the lifting hook, completing the upward limit setting for the lifting hook.

Claims

1. A wire tube type limit device for a hook, comprising a control device, a limit mechanism and a moving device, characterized in that: The control device includes a box, a travel switch, a rocker arm, a motion block, a first rigid member, an elastic member mounting seat and an elastic member. The elastic member mounting seat is fixedly installed in the box, one end of the elastic member is connected to the elastic member mounting seat, and the other end of the elastic member is connected to the first rigid member. The first rigid member is fixedly connected to the motion block, the travel switch is fixedly installed in the box, one end of the rocker arm is hinged to the motion block, and the other end of the rocker arm is hinged to the box, one end of the first rigid member passes through a limiting mechanism and is connected to one end of the limiting mechanism, and the other end of the limiting mechanism is rotatably connected to a moving device.

2. According to claim 1, a wire tube type limiter for a hook, characterized in that: The limiting mechanism includes a limiting seat and a limiting shaft, the first rigid member passes through the limiting seat and is connected to one end of the limiting shaft, the limiting shaft is slidably connected to the limiting seat, and the other end of the limiting shaft is rotationally connected to the moving device.

3. According to claim 1, a wire tube type limiter for a hook, characterized in that: The elastic member and the travel switch are arranged in parallel in the box body, the first rigid member drives the moving member to perform linear motion, and the moving block drives the swing rod to perform arc motion.

4. According to claim 1, a wire tube type limiter for a hook, characterized in that: The first rigid component is a steel wire rope, and steel wire rope lock buckles are provided at the connection between the first rigid component and the elastic component, at the connection between the first rigid component and the moving block, and at the connection between the first rigid component and the limiting shaft.

5. According to claim 2, a wire tube type limiter for a hook, characterized in that: The limit seat comprises a limit seat body and limit plates arranged on both sides of the limit seat body, the limit plates are arranged vertically to the limit seat body, the limit seat body is provided with a mounting hole, one limit plate is provided with a groove, and the other limit plate is provided with a through hole.

6. According to claim 2, a wire tube type limiter for a hook, characterized in that: The limiting shaft is provided with a disc, the disc is in contact with the limiting plate on the other side, and connecting holes are respectively provided at both ends of the disc.

7. According to claim 1, a wire tube type limiter for a hook, characterized in that: The moving device includes: a second rigid part, a third rigid part, a fourth rigid part, a buckle and a heavy hammer, one end of the second rigid part is connected to the limiting shaft, the other end of the second rigid part is connected to the buckle, one end of the third rigid part and the fourth rigid part are connected to the buckle, and the other end of the third rigid part and the fourth rigid part are connected to the heavy hammer.

8. According to claim 2, a wire tube type limiter for a hook, characterized in that: The limiting mechanism and the control device are provided with a wire tube, the first rigid member is movably arranged in the wire tube, and limiting protrusions are arranged at both ends of the wire tube. The two ends of the wire tube are installed in the grooves of the control device and the limiting mechanism through the limiting protrusions.

9. The wire tube type limiter for a hook according to claim 1, characterized in that: The moving device also includes a fifth rigid member, one end of which is connected to the boom, and the other end of which passes through a weight and is connected to the hook.

10. The wire tube type limiter for a hook according to claim 7, characterized in that: The second rigid member, the third rigid member and the fourth rigid member are kept in a taut state by hanging down due to the gravity of the weight.

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