A sling weight limiting device

Abstract

The present application provides a kind of sling heavy hammer limiting device, including trigger mechanism, heavy hammer mechanism, platform, guide mechanism, anti-shake mechanism, height detector and sling.The trigger mechanism is fixed on the platform of crane, the guide mechanism is used for the guide of heavy hammer mechanism, the anti-shake mechanism is connected guide mechanism and platform, the height detector is fixed at the lower end of guide mechanism, and the sling is located below the device;There is spring in trigger mechanism and the trigger speed is increased by spring force;Guide mechanism can make heavy hammer mechanism trigger limit switch accurately;Anti-shake mechanism prevents guide mechanism from swinging and has anti-falling function;Height detector is provided with early warning value, when the height of sling reaches early warning value, limit switch can be triggered, and lifting power is disconnected, to prevent the sling from hitting the platform.The present application solves the problems of easy winding of traction wire, easy jamming of top rod, device falling and injury, and slow response under the conditions of high lifting height, large wind load and vibration, and quickly, effectively and accurately prevents the sling from hitting the platform.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of position limiting device and safety technology, and particularly relates to a hoist weight limiting device. BACKGROUND

[0002] A hoist is a material taking device of some special cranes. In order to ensure safety in use and prevent the hoist from hitting the top, causing safety accidents, a hoist anti-collision device is usually installed on the crane. The anti-collision devices currently installed on the crane mainly include: weight type, fork type, side pressure type, etc. The weight limiting device of the present application refers to the weight type. In the actual application of preventing the hoist from hitting the top, the weight type is often used. However, the traction wire of this structure is easy to entangle with the lifting wire rope of the crane, resulting in the failure of the weight limiter. For the working conditions where the lifting height of the hoist is high and there is a large wind load and vibration, the weight type with a traction wire alone is easy to entangle with the lifting wire rope, and the weight itself is heavy and easy to be affected by vibration, resulting in swinging and reducing the reliability of the device. Some weight types use a jacking rod instead of a traction wire to avoid entanglement. At this time, the jacking rod is long and easy to bend and jam under stress, resulting in the failure of the weight limiter. The lower end of the weight limiter is usually suspended in the air and may fall and cause personal injury, resulting in personal accidents. The response time of the device is particularly important when the hoist hits the top at a high speed, and untimely response may cause safety accidents.

[0003] Chinese utility model patent CN210528294U discloses a crown block weight lifting limiting device. It includes a weight hanging frame, a crank, a counterweight, a travel switch, etc. The utility model patent uses a weight hanging frame, which is connected with the crank through a traction wire, and the other end of the crank has a counterweight. When working, the hoist rises, lifting the weight hanging frame, and the weight counterweight presses down the travel switch by its own gravity, the equipment is powered off, and the hoist stops rising. However, the utility model patent does not consider that the weight hanging frame connected with the crank by the traction wire is easy to swing when the crane is running, resulting in false touch, and the traction wire is easy to break and cause high-altitude falling objects to injure people. At the same time, due to the swing, the hoist is also difficult to accurately lift the weight hanging frame, resulting in the failure of the weight limiting function. The elasticity of the traction wire may suddenly stretch when subjected to external force, making the traction wire easy to entangle after relaxation, resulting in the failure of the weight limiting function.

[0004] The utility model discloses a heavy hammer limiting device for lifting device. Including limit switch, heavy hammer, guide device. The utility model discloses a top rod directly triggers limit switch, and the hammer rod is limited through the limiting rod and the limiting plate. When working, the lifting appliance rises, and the top rod is triggered to limit switch, and the lifting appliance stops rising. However, the utility model does not consider that the lifting appliance has great inertia and impact, and the limit switch is damaged by directly triggering the limit switch with the top rod. The whole top rod will cause the top rod to be too long, and the possibility of bending under stress increases. The guide device is fixed by the fixed plate only, and the anti-vibration ability is poor, and bending is easy to occur under stress, causing the top rod to be stuck and the device to fail.

[0005] The utility model discloses a bridge crane grab bucket's rising limit protection device. Including platform, heavy hammer limit switch, connecting rod, top rod, traction steel wire, limit ring, proximity switch etc. The utility model discloses a top rod and traction steel wire combination, and the connecting rod is fixed in top rod, and the limit ring restricts the swing of top rod, and the proximity switch plays the role of limit protection. When working, the lifting appliance rises, and the top rod is triggered to limit switch, and the lifting appliance stops rising;The lifting appliance is close to the hammer head of top rod, and the proximity switch acts first to control the lifting appliance to stop rising. However, the utility model does not consider that the elasticity of traction steel wire can suddenly stretch when it is subjected to external force, so that the traction steel wire is easy to entangle after relaxation, causing the trigger heavy hammer limit function to fail, and the steel wire rope remains straight and is not easy to cause this kind of problem;At the same time, the utility model discloses a connecting rod in the air to fix top rod, and forms a cantilever beam structure, and the stress performance is not good, and the connecting rod is easy to produce great deformation under the moving inertia of crane, and bending occurs, causing the top rod to be stuck, and the trigger heavy hammer limit switch function fails. Moreover, the cantilever beam structure has poor integrity, and the connecting position of platform and connecting rod is easy to break, and the weight of top rod and hammer head is heavy, and once breaking and falling, it is easy to cause safety accidents. SUMMARY

[0006] To solve the existing problems, Changsha University of Science and Technology team and Hunan Zhongtie Wuxin Heavy Industry Co., Ltd. Team cooperation, put forward a kind of sling weight limiting device, for solving in the lifting height is higher, there is a large wind load and vibration conditions, heavy hammer limiting device traction wire easy to entangle, the top rod is easy to be stuck, may fall and hurt and sling speed is too fast device reaction slow and other problems, improve the reliability and safety of heavy hammer limiting device, reduce the probability of safety accidents, protect the property safety and personal safety of users. The present application makes the weight of the top rod far greater than the weight of the weight, so that the traction wire is straight in the normal state, and the spring force is used to keep the traction wire straight during work, thereby reducing the possibility of entanglement of the traction wire from straight to relaxation and the lifting wire, and improving the reliability of the device. The anti-shaking steel wire fixing guide mechanism is adopted, a cable-stayed cantilever structure is formed, the load is dispersed, the anti-shaking ability of the structure is improved, the stability and carrying capacity of the device can be effectively improved, the possibility of top rod sticking is reduced, and the anti-falling function of the device is also provided. The spring force is used to accelerate the weight to fall, so as to trigger the limit switch as soon as possible and disconnect the lifting power supply. The height detector is used to detect the height of the sling, and when the warning height is reached, the limit switch is triggered and the lifting power supply of the sling is disconnected.

[0007] The present application is a kind of sling weight limiting device, which is described in detail.

[0008] In order to achieve the above purpose, the present application provides a kind of weight limiting device of crane sling, which mainly includes: trigger mechanism, weight mechanism, platform, guide mechanism, anti-shaking mechanism, height detector and sling. The trigger mechanism is fixed on the platform by bolts, the guide mechanism is used for guiding the weight mechanism, the anti-shaking mechanism connects the guide mechanism and the platform and prevents the swing of the guide mechanism, the height detector is fixed at the lower end of the guide mechanism, and the sling is located below the device.

[0009] The trigger mechanism includes limit switch, limit support, guide frame, box body, spring seat, spring and box cover. The limit switch is installed on the platform, and the limit support is fixed on the box body. The guide frame is installed in the box body and supported by the limit support. The box body and the box cover are connected by bolts, and the box body is connected to the platform by bolts. The spring seat is fixed on the lower surface of the box cover, and the spring is installed in the spring seat. The spring is usually compressed by the weight, and elastically recovers during work to accelerate the weight to fall, so as to trigger the limit switch as soon as possible and disconnect the lifting power supply of the sling.

[0010] The weight mechanism includes weight, traction wire, limit plate, top rod and rod head. The rod head is fixed on the top rod by bolts, and the limit plate is welded on the top rod. The two ends of the traction wire are connected with the weight and the top rod respectively, and the weight of the top rod is much greater than that of the weight, so that the traction wire is usually straight, and the spring is compressed.

[0011] The guide mechanism comprises a pulley, a support, a mounting plate, an upper guide sleeve, an upper flange plate, a lower flange plate and a lower guide sleeve. The support is fixed on the platform, and the pulley is mounted on the support. The upper flange plate and the lower flange plate are welded with the upper guide sleeve and the lower guide sleeve respectively, and the upper flange plate and the lower flange plate are connected by bolts. The mounting plate is welded on the upper guide sleeve and fixed on the platform by bolts.

[0012] The anti-shaking mechanism comprises a fixing block and anti-shaking steel wires. The fixing block is mounted on the platform and connected with the lower guide sleeve through the anti-shaking steel wires. The anti-shaking steel wires pull the lower guide sleeve and restrict each other, so that the lower guide sleeve cannot swing, and the reliability of the device triggering is improved.

[0013] The guide frame guides the falling of the heavy hammer, the diameter of the bottom of the heavy hammer is larger than the diameter of the middle hole of the limiting support, and the heavy hammer is supported by the limiting support after falling, so that the limiting switch is prevented from being directly pressed and broken.

[0014] The traction steel wire is prone to breakage at both ends due to stress concentration. If breakage occurs, when the traction steel wire breaks, the top rod will be stuck by the upper flange plate, so that it will not fall and cause personnel injury.

[0015] The parts of the heavy hammer mechanism, the guide mechanism and the anti-shaking mechanism below the platform can be pulled out from the hole of the platform by unscrewing the bolts on the mounting plate, which is convenient for maintenance.

[0016] The working principle of the lifting appliance heavy hammer limiting device is that when the lifting appliance rises and touches and lifts the heavy hammer mechanism, the heavy hammer of the heavy hammer mechanism falls, the limiting switch of the triggering mechanism is triggered, the lifting power of the lifting appliance can be disconnected, and the lifting appliance immediately stops rising. At the same time, the lifting appliance rises close to the height detector, the height detector receives the signal, when the lifting appliance height value reaches the early warning value, the limiting switch can also be triggered, the lifting power of the lifting appliance is disconnected, and double protection measures prevent the lifting appliance from hitting the platform.

[0017] Compared with the prior art, the lifting appliance heavy hammer limiting device has the beneficial effects that.

[0018] ①High reliability. By making the self-weight of the top rod much larger than the heavy hammer, the steel wire rope is kept straight in the normal state, and the traction steel wire is kept straight in the working state by the spring force, which reduces the possibility of winding of the traction steel wire from being straight to being relaxed. The anti-shaking mechanism is adopted to enhance the anti-shock ability of the device. Based on the above two ways, the reliability of the device is improved.

[0019] ②Good safety. When the traction steel wire breaks, the top rod is stuck at the upper flange plate by the limiting plate, and the lower guide sleeve is pulled by the anti-shaking steel wire, so that the top rod, the lower guide sleeve and the related components will not fall.

[0020] 3. Fast response. A spring is installed in the trigger mechanism, which is usually in compression state, and restores elastically during work to accelerate the weight to drop and trigger the limit switch as soon as possible, thus improving the response speed of the trigger mechanism.

[0021] 4. Strong applicability. The anti-shaking mechanism enhances the anti-shaking ability of the device and the environmental adaptability. The guide sleeve is in segmented type, and the installation method is mostly bolted, which is convenient for disassembly and assembly, and occupies less length space during transportation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the present application;

[0023] Figure 2 is the trigger mechanism structure schematic diagram in Figure 1 ;

[0024] Figure 3 is the weight mechanism structure schematic diagram in Figure 1 ;

[0025] Figure 4 is the guide mechanism structure schematic diagram in Figure 1 ;

[0026] Figure 5 is the anti-shaking mechanism structure schematic diagram in Figure 1 ;

[0027] Figure 6 is the working state schematic diagram of the present application.

[0028] The above Figures 1 to 6 indicates: 1, trigger mechanism, 1-1, limit switch, 1-2, limit support, 1-3, guide frame, 1-4, box body, 1-5, spring seat, 1-6, spring, 1-7, box cover; 2, weight mechanism, 2-1, weight, 2-2, traction steel wire, 2-3, limit plate, 2-4, top rod, 2-5, top rod head; 3, platform; 4, guide mechanism, 4-1, pulley, 4-2, support, 4-3, mounting plate, 4-4, upper guide sleeve, 4-5, upper flange plate, 4-6, lower flange plate, 4-7, lower guide sleeve; 5, anti-shaking mechanism, 5-1, fixed block, 5-2, anti-shaking steel wire; 6, height detector; 7, lifting appliance. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in conjunction with the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that the terms "intermediate", "diameter", "height", "upper", "lower", "front", "back", "left", "right", "vertical", "top", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified. In the description of the present application, the meaning of "four" refers to the number of anti-rolling steel wires required for the stability of the device, which can be three, five, six, etc.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0034] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, although the terms "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms since such elements are commonly known by other terms.

[0035] The lifting device weight limiter device comprises a trigger mechanism 1, a weight mechanism 2, a platform 3, a guide mechanism 4, an anti-shake mechanism 5, a height detector 6 and a lifting device 7. The trigger mechanism 1 comprises a limit switch 1-1, a limit support 1-2, a guide bracket 1-3, a box body 1-4, a spring seat 1-5, a spring 1-6 and a box cover 1-7. The weight mechanism 2 comprises a weight 2-1, a traction steel wire 2-2, a limit plate 2-3, a top rod 2-4 and a top rod head 2-5. The guide mechanism 4 comprises a pulley 4-1, a support 4-2, a mounting plate 4-3, an upper guide sleeve 4-4, an upper flange plate 4-5, a lower flange plate 4-6 and a lower guide sleeve 4-7. The anti-shake mechanism 5 comprises a fixed block 5-1 and an anti-shake steel wire 5-2. The height detector 6 can receive the signal of the lifting device rising, and trigger the limit switch when the lifting device height value reaches the early warning value.

[0036] In the embodiment, preferably, the trigger mechanism 1 is fixed on the platform 3 by bolts, the guide mechanism 4 is used for guiding the weight mechanism 2, the anti-shake mechanism 5 connects the guide mechanism 4 and the platform 3 and prevents the swing of the guide mechanism 4, the height detector 6 is fixed at the lower end of the guide mechanism 4, and the lifting device 7 is located below the device.

[0037] In the embodiment, preferably, the limit switch 1-1 is installed on the platform 3, and the limit support 1-2 is fixed on the box body 1-4. The guide bracket 1-3 is installed in the box body 1-4 and supported by the limit support 1-2. The box body 1-4 and the box cover 1-7 are connected by bolts, and at the same time, the box body 1-4 is connected to the platform 3 by bolts, which is convenient for disassembly and assembly. The spring seat 1-5 is fixed on the lower surface of the box cover 1-7. The spring seat 1-5 is fixed on the lower surface of the box cover 1-7, and the spring 1-6 is installed in the spring seat 1-5. The spring 1-6 is usually compressed by the weight 2-1, and elastically recovers during work, so as to accelerate the falling of the weight 2-1, thereby triggering the limit switch 1-1 as soon as possible, disconnecting the lifting device 7 lifting power supply, preventing the lifting device 7 from hitting the platform 3, and improving the response speed of the trigger mechanism 1.

[0038] In this embodiment, preferably, the rod head 2-5 is bolted to the jacking rod 2-4, and the limiting plate 2-3 is welded to the jacking rod 2-4. The two ends of the traction wire 2-2 are connected to the weight 2-1 and the jacking rod 2-4 respectively. The weight of the jacking rod 2-4 is much greater than that of the weight 2-1, so that the traction wire 2-2 is usually straight, and the spring 1-6 is compressed. The gravitational potential energy is converted into elastic potential energy and stored in the spring 1-6. During operation, the energy is released, thereby maintaining the traction wire 2-2 straight and avoiding winding.

[0039] In this embodiment, preferably, the bracket 4-2 is fixed to the platform 3, and the pulley 4-1 is installed on the bracket (4-2). The upper flange plate 4-5 and the lower flange plate 4-6 are welded to the upper guide sleeve 4-4 and the lower guide sleeve 4-7 respectively, and are bolted together. The mounting plate 4-3 is welded to the upper guide sleeve 4-4 and is bolted to the platform 3. The length space occupied by the guide mechanism 4 during transportation is small.

[0040] In this embodiment, preferably, the fixed block 5-1 is installed on the platform 3 and connected through the anti-rolling steel wire 5-2 and the lower guide sleeve 4-7. The four anti-rolling steel wires 5-2 pull the lower guide sleeve 4-7 and restrict each other, so that the lower guide sleeve 4-7 does not swing, improving the reliability of the device triggering. At the same time, it prevents the lower guide sleeve 4-7 and related components from falling, improving the safety of the device.

[0041] In this embodiment, preferably, the guide frame 1-3 guides the falling of the weight 2-1. The diameter of the bottom of the weight 2-1 is greater than the diameter of the middle hole 1-2-1 in the limiting bracket 1-2. After the weight 2-1 falls, it is supported by the limiting bracket 1-2, thereby preventing direct pressure from damaging the limit switch 1-1 and reducing property loss.

[0042] In this embodiment, preferably, the traction wire 2-2 is prone to breakage at both ends due to stress concentration. If it breaks, the jacking rod 2-4 will be caught by the upper flange plate 4-5 because the diameter of the limiting plate 2-3 is greater than the diameter of the middle through hole of the upper flange plate 4-5, thereby preventing the device from falling and causing casualties.

[0043] In this embodiment, preferably, part of the weight mechanism 2, the guide mechanism 4, and the anti-rolling mechanism 5 below the platform 3 can be removed from the hole of the platform 3 by unscrewing the bolts on the mounting plate 4-3, facilitating maintenance.

[0044] In this embodiment, preferably, the working principle of the lifting device weight limiting device is that when the lifting device 7 rises and touches and lifts the weight mechanism 2, the weight 2-1 of the weight mechanism 2 falls, the limiting switch 1-1 of the trigger mechanism 1 is triggered, the lifting power of the lifting device 7 can be disconnected, and the lifting device 7 immediately stops rising. At the same time, the lifting device 7 rises close to the height detector 6, the height detector 6 receives a signal, when the height value of the lifting device 7 reaches the early warning value, the limiting switch 1-1 can also be triggered, the lifting power of the lifting device 7 is disconnected, and double protection measures prevent the lifting device 7 from colliding with the platform 3.

[0045] The above-mentioned embodiments should be understood as merely illustrative of the present application, and should not be used to limit the scope of the present application. After reading the present application, those skilled in the art can make various equivalent modifications to the present application, which fall within the scope defined by the appended claims.

Claims

1. A sling weight limiter device, characterized by: The device includes trigger mechanism (1), weight mechanism (2), platform (3), guide mechanism (4), anti-shake mechanism (5), height detector (6) and sling (7), the trigger mechanism (1) is fixed on the platform (3) of crane by bolt, guide mechanism (4) is used for the guide of weight mechanism (2), anti-shake mechanism (5) is connected guide mechanism (4) and platform (3) and prevents the swing of guide mechanism (4), height detector (6) is fixed in the lower end of guide mechanism (4), sling (7) is located below the device, the trigger mechanism (1) includes limit switch (1-1), limit support (1-2), guide bracket (1-3), box (1-4), spring seat (1-5), spring (1-6) and box cover (1-7), limit switch (1-1) is installed on platform (3), limit support (1-2) is fixed on box (1-4), the guide bracket (1-3) is installed in box (1-4), is supported by limit support (1-2), the box (1-4) and box cover (1-7) are connected with bolt, simultaneously, box (1-4) is connected with bolt on platform (3), the spring seat (1-5) is fixed on the lower surface of box cover (1-7), spring (1-6) is installed in spring seat (1-5), the spring (1-6) is compressed by weight (2-1) in non-working time, and is elastically recovered in working time, accelerates the falling of weight (2-1), to trigger limit switch (1-1) as soon as possible, disconnects sling (7) hoisting power supply, the weight mechanism (2) includes weight (2-1), traction steel wire (2-2), limit plate (2-3), top rod (2-4) and rod head (2-5), the rod head (2-5) is connected with bolt on top rod (2-4), limit plate (2-3) is welded on top rod (2-4), the both ends of traction steel wire (2-2) are connected with weight (2-1) and top rod (2-4) respectively, the weight of top rod (2-4) is much greater than weight (2-1), so that traction steel wire (2-2) is straight, spring (1-6) is compressed, the guide mechanism (4) includes pulley (4-1), support (4-2), mounting plate (4-3), upper guide sleeve (4-4), upper flange plate (4-5), lower flange plate (4-6) and lower guide sleeve (4-7), the support (4-2) is fixed on platform (3), and pulley (4-1) is installed on support (4-2), the upper flange plate (4-5), lower flange plate (4-6) are welded with upper guide sleeve (4-4), lower guide sleeve (4-7) respectively, and are connected with bolt between upper flange plate (4-5) and lower flange plate (4-6), the mounting plate (4-3) is welded on upper guide sleeve (4-4) and is fixed on platform (3) by bolt, the anti-shake mechanism (5) includes fixed block (5-1) and anti-shake steel wire (5-2), the fixed block (5-1) is installed on platform (3) and is connected through anti-shake steel wire (5-2) and lower guide sleeve (4-7).A plurality of anti-shaking steel wires (5-2) pull the lower guide sleeve (4-7) and restrict each other, so that the lower guide sleeve (4-7) cannot swing, and the reliability of triggering of the device is improved.

2. The load limiter device of claim 1, wherein: The guide frame (1-3) guides the falling of the weight (2-1), the bottom diameter of the weight (2-1) is greater than the diameter of the middle hole (1-2-1) of the limiting support (1-2), and the weight (2-1) is supported by the limiting support (1-2) after falling, thereby preventing the direct pressure from damaging the limit switch (1-1).

3. The load limiter device of claim 1, wherein: The traction steel wire (2-2) is prone to breaking due to stress concentration at both ends, and if breaking occurs, the top rod (2-4) will be stuck by the upper flange plate (4-5) due to the diameter of the limiting plate (2-3) being greater than the diameter of the middle through hole of the upper flange plate (4-5), thereby preventing falling and causing casualties.

4. The load limiter of claim 1, wherein: The parts of the weight mechanism (2), the guide mechanism (4) and the anti-shaking mechanism (5) below the platform (3) can be pulled out from the hole of the platform (3) by unscrewing the bolts on the mounting plate (4-3), facilitating maintenance.

5. The load limiter of claim 1, wherein: The working principle of the lifting device weight limiting device is that when the lifting device (7) rises and touches and lifts the weight mechanism (2), the weight (2-1) of the weight mechanism (2) falls, the limit switch (1-1) of the trigger mechanism (1) is triggered, the lifting power of the lifting device (7) is disconnected, and the lifting device (7) immediately stops rising; at the same time, the lifting device (7) rises close to the height detector (6), the height detector (6) receives a signal, and when the lifting device height value reaches a warning value, the limit switch (1-1) can also be triggered, the lifting power of the lifting device (7) is disconnected, and double protection measures prevent the lifting device (7) from colliding with the platform (3).

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