Anti-falling device for vertical hoist

Abstract

The utility model relates to the vertical elevator field, specifically provides a kind of vertical elevator anti-falling device, is connected to guide rail, the anti-falling device includes: fixed plate, limit waist hole is provided on the fixed plate;Mounting shaft, the mounting shaft sliding connection is connected to the inside of the limit waist hole, the mounting shaft is vertically arranged with the fixed plate;Clamping mechanism, the clamping mechanism includes rack, eccentric clamping wheel, first gear and first spring, the rack is fixedly connected with the mounting shaft, the eccentric clamping wheel is rotatably connected to the fixed plate, the first gear and the eccentric clamping wheel are fixedly connected, the rack and the first gear are engaged, the both ends of the first spring abut on the mounting shaft and the fixed plate, the axis of the first spring is parallel with the sliding track of the mounting shaft;The utility model can prevent elevator out of control to descend.

Description

Technical Field

[0001] This utility model relates to the field of vertical lifting machines, and in particular to a fall prevention device for vertical lifting machines. Background Technology

[0002] For the safety of production personnel, vertical elevators require the addition of fall protection mechanisms during operation to prevent the lifting belt or chain from breaking and the loading platform from falling during lifting. Currently, the lifting of the loading platform relies solely on a motor brake or a complex structure with photoelectric sensors for triggering. This design is complex, costly, and prone to causing accidents if the motor brake or sensor malfunctions, leading to an accidental drop of the loading platform. Utility Model Content

[0003] The purpose of this invention is to provide a fall prevention device for vertical hoists, so as to solve the problem of high cost of current fall prevention safety measures for hoists.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A fall protection device for a vertical hoist, connected to a guide rail, the fall protection device comprising: A fixing plate is provided with a limiting oblong hole in the same length direction as the guide rail; The mounting shaft is slidably connected to the inner side of the limiting waist-shaped hole, and the mounting shaft is perpendicular to the fixing plate for connecting the hoist; A clamping mechanism is used to clamp the guide rail when the hoist falls. The clamping mechanism includes a rack, an eccentric clamping wheel, a first gear, and a first spring. The rack is fixedly connected to the mounting shaft. The eccentric clamping wheel is rotatably connected to the fixed plate. The rotation center of the eccentric clamping wheel is eccentric. The first gear is fixedly connected to the eccentric clamping wheel. The rack meshes with the first gear. When the mounting shaft slides within the limiting oblong hole, the rack drives the eccentric clamping wheel to rotate through the first gear. The two ends of the first spring abut against the mounting shaft and the fixed plate. The axis of the first spring is parallel to the sliding trajectory of the mounting shaft.

[0005] Furthermore, a mounting plate is fixedly connected to the mounting shaft, and the mounting plate is arranged perpendicular to the mounting shaft.

[0006] Furthermore, the clamping mechanism also includes: A spring mounting tube is fixedly connected to the fixing plate. The first spring is located inside the spring mounting tube. The spring mounting tube is a cylindrical shape with an opening at one end, and the opening of the spring mounting tube is close to the mounting shaft. A spring seat is fixedly connected to the mounting shaft. A spring mounting post is provided on the spring seat. The spring mounting post is located inside the spring mounting tube. The two ends of the first spring abut against the spring mounting post and the bottom of the spring mounting tube.

[0007] Furthermore, one closed end of the spring mounting tube is connected to an adjusting screw via a thread, and a clamping nut is fixed inside the spring mounting tube to the adjusting screw, and the clamping nut clamps the first spring.

[0008] Furthermore, the rack is provided with a buffer waist-shaped hole, and the fall protection device also includes: A buffer mechanism is provided, comprising a spring shaft, a second spring, and a pad. The spring shaft is slidably connected to the inside of the buffer waist-shaped hole. The pad is fixed to the end of the buffer waist-shaped hole away from the mounting shaft. The second spring is sleeved on the spring shaft, which is fixed to the mounting shaft. The end of the second spring away from the spring shaft abuts against the pad.

[0009] Furthermore, the eccentric clamping wheel is also provided with friction teeth.

[0010] Furthermore, the clamping mechanism also includes: The second gear is rotatably connected to the fixed plate, meshes with the first gear, meshes with the rack, and has fewer teeth than the first gear.

[0011] Furthermore, the fall arrestor also includes: The guiding mechanism includes a first guide wheel and a second guide wheel, which are rotatably connected to the fixed plate. The first guide wheel and the second guide wheel are located on both sides of the guide rail. The guiding mechanism is located on the upper and lower sides of the clamping mechanism. The first guide wheel and the second guide wheel clamp the guide rail.

[0012] Furthermore, an end plate is fixed to the end of the first guide wheel away from the guide rail, and the outer diameter of the end plate is larger than the outer diameter of the first guide wheel.

[0013] In summary, the present invention has the following advantages compared with the prior art: The vertical hoist anti-fall device disclosed in this embodiment of the utility model moves a rack driven by a first spring when the hoist falls out of control. The rack drives the eccentric clamping wheels located on both sides of the guide rail to rotate. When the eccentric clamping wheels rotate, they clamp the guide rail, thereby preventing the hoist from continuing to descend and preventing the hoist from falling out of control. Attached Figure Description

[0014] Figure 1 This is a first-view structural schematic diagram of the vertical lifting machine fall prevention device disclosed in an embodiment of this utility model.

[0015] Figure 2 This is a second-view structural schematic diagram of the vertical lifting machine fall prevention device disclosed in an embodiment of this utility model.

[0016] Figure 3 This is a schematic diagram showing the connection between the anti-fall device for the vertical hoist and the guide rail, as disclosed in an embodiment of this utility model.

[0017] Figure 4 This is a front view of the vertical lifting machine anti-fall device disclosed in an embodiment of this utility model.

[0018] Figure 5 for Figure 4 Sectional view of AA.

[0019] Figure 6 for Figure 4 The left view.

[0020] Figure 7 This is an exploded view of the vertical hoist fall prevention device disclosed in an embodiment of this utility model.

[0021] Figure label: 100. Fixing plate; 101. Limiting slot; 200. Mounting shaft; 201. Limiting groove; 210. Mounting plate; 211. Mounting bushing; 212. Fastening screw; 300. Clamping mechanism; 310. Rack; 311. Buffer slot; 320. Eccentric clamping wheel; 321. Friction tooth; 330. First gear; 340. Eccentric wheel shaft; 341. First bearing; 350. Second gear; 360. Second shaft; 370. Spring mounting tube; 3 71. End cap; 372. Fixing bracket; 380. First spring; 390. Spring seat; 391. Spring mounting post; 392. Fastening ring; 400. Guide mechanism; 410. First guide wheel; 420. Second guide wheel; 430. End plate; 440. Third rotating shaft; 441. Second bearing; 500. Adjusting screw; 501. Compression nut; 600. Buffer mechanism; 610. Spring shaft; 620. Second spring; 630. Pad; 700. Guide rail. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] Figure 1 , Figure 2 and Figure 5 As shown, one embodiment of this utility model provides a fall protection device for a vertical hoist, connected to a guide rail 700. The fall protection device includes: Fixed plate 100, with a limiting waist-shaped hole 101 on the fixed plate 100 having the same length direction as the first gear guide rail 700; Mounting shaft 200 is slidably connected to the inner side of the limiting waist-shaped hole 101. The mounting shaft 200 is perpendicular to the fixing plate 100 and is used to connect to the hoist. A clamping mechanism 300 is used to clamp the guide rail 700 when the hoist falls. The clamping mechanism 300 includes a rack 310, an eccentric clamping wheel 320, a first gear 330, and a first spring 380. The rack 310 is fixedly connected to the mounting shaft 200. The eccentric clamping wheel 320 is rotatably connected to the fixed plate 100. The rotation center of the eccentric clamping wheel 320 is eccentric. The first gear 330 is fixedly connected to the eccentric clamping wheel 320. The rack 310 and the first gear 330 mesh. When the mounting shaft 200 slides in the limiting waist-shaped hole 101, the rack 310 and the first gear 330 drive the eccentric clamping wheel 320 to rotate. The two ends of the first spring 380 abut against the mounting shaft 200 and the fixed plate 100. The axis of the first spring 380 is parallel to the sliding trajectory of the mounting shaft 200.

[0024] In this embodiment, the mounting shaft 200 is fixedly connected to the hoist. The hoist slides on the guide rail 700 to lift heavy objects. During the sliding process of the hoist, the fixing plate 100 and the clamping mechanism 300 are suspended on the mounting shaft 200 under the action of gravity, that is, the mounting shaft 200 is located at the highest point of the limiting waist-shaped hole 101. At this time, the first spring 380 is in a compressed state, the distance between the two eccentric clamping wheels 320 is at its maximum, and the eccentric clamping wheels 320 and the guide rail 700 are not in contact. When the hoist falls out of control, the hoist and the anti-fall device fall under the action of gravity, and both the hoist and the anti-fall device are in a state of weightlessness. At this time, the first spring 380 can return to its length, and the first spring 380 drives the mounting shaft 200. The mounting shaft 200 slides within the limiting waist-shaped hole 101, causing the rack 310 to slide. The rack 310 then drives the first gear 330 to rotate, which in turn drives the eccentric clamping wheel 320 to rotate. Because the eccentric clamping wheel 320 is eccentrically mounted, as it rotates, the distance between the eccentric clamping wheels 320 gradually decreases until it clamps the guide rail 700. Under the frictional force between the first spring 380 and the guide rail 700, the guide rail 700 is clamped. At this time, the eccentric clamping wheel 320 and the fixing plate 100 are fixed to the guide rail 700. The mounting shaft 200 slides to its lowest point within the limiting waist-shaped hole 101, preventing the hoist from continuing to slide down and thus preventing it from falling.

[0025] The vertical hoist fall prevention device disclosed in this embodiment of the utility model uses a first spring 380 to drive a rack 310 to move when the hoist falls out of control. The rack 310 drives the eccentric clamping wheels 320 located on both sides of the guide rail 700 to rotate through a first gear 330. When the eccentric clamping wheels 320 rotate, they clamp the guide rail 700, thereby preventing the hoist from continuing to descend and preventing the hoist from falling out of control.

[0026] Specifically, in this embodiment, the fixing plate 100 is a square plate, and the limiting waist-shaped hole 101 is a waist-shaped hole opened on the fixing plate 100. In this embodiment, the guide rail 700 is vertically arranged, and the limiting waist-shaped hole 101 is vertically arranged.

[0027] The mounting shaft 200 is a rod-shaped structure with an oblong cross-section. The mounting shaft 200 passes through the limiting oblong hole 101. A limiting groove 201 is provided at one end of the mounting shaft 200 that connects to the rack 310. The rack 310 is fixedly connected to the mounting shaft 200 by screws. The width of the end of the mounting shaft 200 with the limiting groove 201 is greater than the width of the limiting oblong hole 101. A fastening ring 392 is also threaded onto the mounting shaft 200. The fastening ring 392 and the rack 310 are located on both sides of the fixing plate 100. The end of the mounting shaft 200 and the fastening ring 392 clamp the fixing plate 100, so that the mounting shaft 200 can only slide within the limiting oblong hole 101.

[0028] Preferably, in this embodiment, a mounting plate 210 is provided on the outer side of the mounting shaft 200, and a mounting sleeve 211 is provided on the mounting plate 210. The mounting sleeve 211 is sleeved on the mounting shaft 200. The mounting plate 210 and the mounting sleeve 211 are arranged perpendicularly. The mounting sleeve 211 and the mounting plate 210 are fixedly connected. The mounting sleeve 211 is fixedly connected to the fastening screw 212 by screws. The fastening screw 212 passes through the end of the mounting shaft 200 and is fixedly connected to the mounting shaft 200. When installed on the hoist, the mounting plate 210 is fixedly connected to the hoist by bolts.

[0029] As a preferred embodiment of this example, Figures 2 to 7 As shown, the clamping mechanism 300 further includes: A spring mounting tube 370 is fixedly connected to the fixing plate 100. The first spring 380 is located inside the spring mounting tube 370. The spring mounting tube 370 is a cylindrical tube with an opening at one end. The opening of the spring mounting tube 370 is close to the mounting shaft 200. A spring seat 390 is fixedly connected to the mounting shaft 200. A spring mounting post 391 is provided on the spring seat 390. The spring mounting post 391 is located inside the spring mounting tube 370. The two ends of the first spring 380 abut against the spring mounting post 391 and the bottom of the spring mounting tube 370.

[0030] In this embodiment, an end cap 371 is provided at one closed end of the spring mounting tube 370. The end cap 371 is fixed to the spring mounting tube 370 by adhesive or threaded connection so that the spring mounting tube 370 forms a cylindrical shape with an opening at one end. A fixing bracket 372 is fixedly connected to the spring mounting tube 370 by welding. The end cap 371 is fixedly connected to the fixing plate 100 by bolts.

[0031] The spring seat 390 is a ring structure, and the spring mounting post 391 is a cylindrical structure. The spring mounting post 391 and the spring seat 390 are fixedly connected by welding. The spring seat 390 is sleeved on the mounting shaft 200. Both sides of the spring mounting post 391 are provided with fastening rings 392, and the two fastening rings 392 clamp the spring seat 390.

[0032] The rack 310 is a square rod shape, such as... Figure 5 and Figure 7 As shown, the rack 310 is provided with 311, and the fall protection device further includes: A buffer mechanism 600 includes a spring shaft 610, a second spring 620, and a pad 630. The spring shaft 610 is slidably connected to the inner side of the 311. The pad 630 is fixed to the end of the 311 away from the mounting shaft 200. The second spring 620 is sleeved on the spring shaft 610. The spring shaft 610 is fixed to the mounting shaft 200 by bolts. The end of the second spring 620 away from the spring shaft 610 abuts against the pad 630. The pad 630 is provided with a semi-cylindrical structure. The semi-cylindrical structure of the pad 630 is fixed to the inner side of the 311 by an interference fit. When the eccentric clamping wheel 320 clamps the guide rail 700, the mounting shaft 200 can continue to press down, thereby reducing the impact of the mounting shaft 200 on the rack 310.

[0033] The eccentric clamping wheel 320 is rotatably connected to the fixed plate 100 via an eccentric wheel shaft 340. The eccentric wheel shaft 340 is fixed to the fixed plate 100 via a threaded connection. A first bearing 341 is sleeved on the eccentric wheel shaft 340. The eccentric clamping wheel 320 is sleeved on the first bearing 341, so that the eccentric clamping wheel 320 rotates on the eccentric wheel shaft 341. The first bearing 341 is an engineering plastic bearing.

[0034] The first gear 330 and the eccentric clamping wheel 320 are fixedly connected by screws or are an integral structure.

[0035] Preferably, the eccentric clamping wheel 320 is further provided with friction teeth 321, which are used to increase the friction between the eccentric clamping wheel 320 and the guide rail 700.

[0036] Preferably, the clamping mechanism 300 further includes a second gear 350, which is rotatably connected to the fixed plate 100. The second gear 350 meshes with the first gear 330 and the rack 310. When the rack 310 slides, it drives the second gear 350 to rotate. The second gear 350 drives the first gear 330 to rotate. The first gear 330 drives the eccentric clamping wheel 320 to rotate. The number of teeth of the second gear 350 is less than the number of teeth of the first gear 330, thus forming a speed reducer.

[0037] The second gear 350 is fixed to the fixing plate 100 by the second rotating shaft 360, the second rotating shaft 360 is fixed to the fixing plate 100 by threads, and the second gear 350 is sleeved on the second rotating shaft 360.

[0038] Preferred, such as Figures 2 to 7 As shown, the fall protection device further includes: The guide mechanism 400 includes a first guide wheel 410 and a second guide wheel 420, which are rotatably connected to the fixed plate 100. The first guide wheel 410 and the second guide wheel 420 are located on both sides of the guide rail 700. The guide mechanism 400 is located on the upper and lower sides of the clamping mechanism 300. The first guide wheel 410 and the second guide wheel 420 clamp the guide rail 700 and limit the position of the fixed plate 100.

[0039] Both the first guide wheel 410 and the second guide wheel 420 are round rollers. The first guide wheel 410 and the second guide wheel 420 are rotatably connected to the fixed plate 100 via a third rotating shaft 440. A second bearing 441 is provided on the third rotating shaft 440. The first guide wheel 410 and the second guide wheel 420 are sleeved on the second bearing 441, and the second bearing 441 is sleeved on the third rotating shaft 440. The second bearing 441 is an engineering plastic bearing.

[0040] Preferably, an end plate 430 is fixed to the end of the first guide wheel 410 away from the guide rail 700. The outer diameter of the end plate 430 is larger than the outer diameter of the first guide wheel 410. The end plate 430 is used to block the guide rail 700 and prevent the guide rail 700 from touching the rack 310.

[0041] Preferably, the fall arrestor further includes an adjusting screw 500, which is threadedly connected to the end cap 371. A clamping nut 501 is fixed inside the spring mounting tube 370 on the adjusting screw 500. The clamping nut 501 clamps the first spring 380. The adjusting screw 500 is used to adjust the compression of the first spring 380.

[0042] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0043] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fall protection device for a vertical hoist, connected to a guide rail, characterized in that, The fall protection device includes: A fixing plate is provided with a limiting oblong hole in the same length direction as the guide rail; The mounting shaft is slidably connected to the inner side of the limiting waist-shaped hole, and the mounting shaft is perpendicular to the fixing plate for connecting the hoist; A clamping mechanism is used to clamp the guide rail when the hoist falls. The clamping mechanism includes a rack, an eccentric clamping wheel, a first gear, and a first spring. The rack is fixedly connected to the mounting shaft. The eccentric clamping wheel is rotatably connected to the fixed plate. The rotation center of the eccentric clamping wheel is eccentric. The first gear is fixedly connected to the eccentric clamping wheel. The rack meshes with the first gear. When the mounting shaft slides within the limiting oblong hole, the rack drives the eccentric clamping wheel to rotate through the first gear. The two ends of the first spring abut against the mounting shaft and the fixed plate. The axis of the first spring is parallel to the sliding trajectory of the mounting shaft.

2. The vertical hoist fall prevention device according to claim 1, characterized in that, A mounting plate is fixedly connected to the mounting shaft, and the mounting plate is perpendicular to the mounting shaft.

3. The vertical hoist fall prevention device according to claim 1, characterized in that, The clamping mechanism further includes: A spring mounting tube is fixedly connected to the fixing plate. The first spring is located inside the spring mounting tube. The spring mounting tube is a cylindrical shape with an opening at one end, and the opening of the spring mounting tube is close to the mounting shaft. A spring seat is fixedly connected to the mounting shaft. A spring mounting post is provided on the spring seat. The spring mounting post is located inside the spring mounting tube. The two ends of the first spring abut against the spring mounting post and the bottom of the spring mounting tube.

4. The vertical hoist fall prevention device according to claim 3, characterized in that, One closed end of the spring mounting tube is connected to an adjusting screw via a thread. A clamping nut is fixed inside the spring mounting tube to the adjusting screw, and the clamping nut clamps the first spring.

5. The vertical hoist fall prevention device according to claim 4, characterized in that, The rack is provided with a buffer waist-shaped hole, and the fall protection device further includes: A buffer mechanism is provided, comprising a spring shaft, a second spring, and a pad. The spring shaft is slidably connected to the inside of the buffer waist-shaped hole. The pad is fixed to the end of the buffer waist-shaped hole away from the mounting shaft. The second spring is sleeved on the spring shaft, which is fixed to the mounting shaft. The end of the second spring away from the spring shaft abuts against the pad.

6. The vertical hoist fall arrestor according to any one of claims 1-5, characterized in that, The eccentric clamping wheel is also provided with friction teeth.

7. The vertical hoist fall arrestor according to any one of claims 1-5, characterized in that, The clamping mechanism further includes: The second gear is rotatably connected to the fixed plate, meshes with the first gear, meshes with the rack, and has fewer teeth than the first gear.

8. The vertical hoist fall arrestor according to any one of claims 1-5, characterized in that, The fall protection device also includes: The guiding mechanism includes a first guide wheel and a second guide wheel, which are rotatably connected to the fixed plate. The first guide wheel and the second guide wheel are located on both sides of the guide rail. The guiding mechanism is located on the upper and lower sides of the clamping mechanism. The first guide wheel and the second guide wheel clamp the guide rail.

9. The vertical hoist fall prevention device according to claim 8, characterized in that, An end plate is fixed to the end of the first guide wheel away from the guide rail, and the outer diameter of the end plate is larger than the outer diameter of the first guide wheel.

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