Lifting platform anti-fall mechanism and method

Abstract

The lifting platform anti-fall mechanism and method described in the present invention propose a new solution for the flexible design of the relative position of the traction member and the anti-fall mechanism, so as to effectively reduce the installation space, conveniently change the direction of the traction force, and shorten the brake triggering time. The lifting platform anti-fall mechanism includes a group of horizontally arranged anti-fall guide column seats installed on the side arms of the cargo platform by bolts, a group of vertical ends of the guide column are installed in parallel between the anti-fall guide column seats, sliders are respectively provided between the guide columns on both sides, compression springs are provided on the guide columns between the top anti-fall guide column seat and the slider, and a chain tensioning seat and a cam fork are installed on the slider; a group of arc-shaped holes are provided on the cargo platform side arm, a group of camshafts are installed, a traction member is connected to the side of the cargo platform side arm, a spring is provided between the traction member and the lifting plate and on the outside of the sleeve; an anti-fall angle steel is vertically installed on the cargo platform side arm, and a pair of brake cams are relatively provided between the anti-fall angle steels.

Description

Technical Field

[0001] The invention relates to a novel anti-falling mechanism applied to vertical lifting equipment and a control method thereof, belonging to the technical field of logistics and warehousing. Background Art

[0002] At present, various types of lifting equipment are commonly used in logistics and transportation sites, such as wire rope traction to transport goods between different working heights through the loading platform.

[0003] Existing cargo platforms typically use steel wire ropes or lifting chains as supports. After prolonged use under heavy loads, these supports can become partially damaged or even break. This can cause the platform to fall freely, resulting in serious safety incidents and potentially injuring workers and other equipment on-site. To prevent these loads, a safety mechanism is typically designed and configured.

[0004] As shown in the domestic patent application previously published by the applicant below, application number 2019107730544, entitled Cargo Platform with New Guide Device, it proposes a linked anti-fall mechanism with elastic energy storage and no need for additional emergency starting power. It provides braking force when the cargo platform's load-bearing parts are partially damaged or broken, thereby avoiding the occurrence of safety accidents caused by accidental falling of the cargo platform. The lifting anti-fall device is installed on the side arm of the cargo platform, including a lever connected to the cargo platform bearing member at one end, the other end of the lever is connected to the central shaft of the slider, and a group of connecting rod shafts are provided on the slider in the opposite direction of the central shaft; a group of guide columns are passed through and installed in the vertical direction of the slider, and the guide column sleeves are provided with reset springs; a group of anti-fall guide column seats are respectively connected to the upper and lower shaft ends of the connecting rod shaft on both sides of the slider and the reset spring in the vertical direction; the anti-fall guide column seat is installed on one side of the anti-fall base plate by bolts, and two groups of brake bevel blocks are installed on the other side of the anti-fall base plate; the connecting rod shaft passes through the anti-fall base plate and is located between the two groups of brake bevel blocks, and an idler shaft is installed at the end of the connecting rod shaft, and a brake idler is suspended at the end of the idler shaft.

[0005] The above-mentioned existing technical solutions are relatively complex and require more installation space. For example, the anti-fall guide column seat needs to be pre-installed on the anti-fall base plate. The components on one side of the guide column are heavy, which is not conducive to immediate triggering of the brake idler wheel, and there is a certain delay in braking; in addition, there is no design to change the direction of the lifting force, and the relative positions of the traction part and the anti-fall mechanism cannot be flexibly arranged. The traction part can only be arranged above the anti-fall mechanism, which has certain limitations on the installation and use of the overall anti-fall mechanism; moreover, the matching relationship between the brake idler wheel and the brake bevel block, due to the large weight and volume of the bevel block, occupies a large space, which is not conducive to the miniaturization design of the anti-fall mechanism.

[0006] In view of this, this patent application is hereby filed. Summary of the Invention

[0007] The lifting platform anti-fall mechanism and method described in the present invention aim to solve the problems existing in the above-mentioned prior art and propose a new solution for flexible design of the relative position of the traction part and the anti-fall mechanism, so as to effectively reduce the installation space, conveniently change the direction of the traction force, and shorten the braking trigger time without the need for additional starting force.

[0008] In order to achieve the above-mentioned design purpose, the lifting platform anti-falling mechanism includes a group of horizontally arranged anti-falling guide post seats installed on the side arms of the cargo platform by bolts, the vertical ends of a group of guide posts are installed in parallel between the anti-falling guide post seats, sliders are respectively provided between the guide posts on both sides, compression springs are provided between the top anti-falling guide post seat and the slider and on the guide posts, and a chain tensioning seat and a cam fork are installed on the slider; a group of arc-shaped holes are provided on the side arms of the cargo platform, a group of cam shafts are installed, a traction member is connected to the side of the side arms of the cargo platform, the top end of the traction member is connected to the rope belt that pulls the cargo platform vertically up and down, and the bottom end of the traction member is connected to the lifting plate, A spring is provided between the traction member and the lifting plate and on the outside of the sleeve; an anti-fall angle steel is vertically installed on the side arm of the cargo platform, and a pair of brake cams are relatively arranged between the anti-fall angle steels, and the brake cams are respectively suspended on the camshafts. A connecting rod is sleeved on each brake cam, and the connecting rod is passed through the arc hole in a direction perpendicular to the side arm of the cargo platform, and the end of the connecting rod is connected to the shift fork after passing through; at least one group of sprockets installed through the sprocket seat is provided on the side arm of the cargo platform; one end of the chain is connected to the chain tensioning seat, and after passing around the sprocket, the other end of the chain is connected to the chain tensioning screw, and the chain tensioning screw is installed on the traction member.

[0009] Furthermore, the spring sleeve is vertically fixed to the side arm of the cargo platform, and the compression spring is sleeved on the outer periphery of the spring sleeve.

[0010] Furthermore, a detection switch is provided opposite to one side of the lifting plate. When the traction member is lifted by a lifting force and the spring is in a compressed state, the lifting plate squeezes the sleeve vertically and contacts the detection switch.

[0011] Furthermore, a detection plate is installed on the slider and a positioning switch is installed on the side arm of the cargo platform; when the traction force provided by the above-mentioned traction member vertically stretches the slider through the chain until the brake cam is no longer in contact with the anti-fall angle steel, the detection plate contacts the positioning switch.

[0012] Based on the structural design of the above-mentioned lifting platform anti-fall mechanism, the present application also proposes the following lifting platform anti-fall method: when the cargo platform is normally lifted and lowered, the traction force provided by the traction member pulls the screw rod upward through the chain, and the tension of the chain is transmitted to the slider to make the slider rise vertically until the compression spring is compressed and the spring sleeve is squeezed; the shift fork drives the connecting rod to rise to prevent a pair of brake cams from approaching each other under the action of gravity. The anti-fall angle steel; when the rope connecting the traction member vertically above breaks, the upward traction force provided by the traction member disappears, and the chain loses the traction member. The sliding block moves downward along the guide column under the dual action of the elastic restoring force of the compression spring and gravity, and the sliding block drives the shift fork to move downward, and the shift fork pushes the connecting rod to slide in the long hole on the shift fork, thereby driving a pair of brake cams to rotate around the fixed axis of the camshaft respectively, and the gap between the brake cam and the anti-fall angle steel gradually decreases; when the brake cam contacts the anti-fall angle steel, the brake cam is subjected to the vertical upward friction resistance provided by the anti-fall angle steel, so that the brake cam and the anti-fall angle steel are self-locked together, and finally the cargo platform is prevented from falling through the side arm of the cargo platform.

[0013] Furthermore, when the upward traction force provided by the traction member disappears, the lifting plate moves vertically downward under the dual action of the elastic restoring force of the spring and gravity and loses contact with the detection switch, triggering an electrical alarm of rope breakage.

[0014] Furthermore, in the process of the slider moving downward through the shift fork to drive the brake cam to rotate around the camshaft, the detection plate on the slider disengages from the positioning switch on the side of the cargo platform side arm, triggering a brake signal alarm.

[0015] In summary, the lifting platform anti-fall mechanism and method described in this application have the following advantages:

[0016] 1. It adopts elastic energy storage. When the cargo platform falls accidentally, there is no need to start the emergency power. The linked anti-fall mechanism can immediately provide locking braking force, effectively avoiding the occurrence of related safety accidents and playing a more significant protective role for operators and equipment.

[0017] 2. The overall structure of the present application is simpler and more compact. The anti-fall guide column seat is directly installed on the side arm of the cargo platform, which can effectively save installation space and has a lighter overall weight.

[0018] 3. This application uses a sprocket to change the direction of the lifting force, which can more flexibly arrange the relative positions of the traction member and the anti-fall mechanism; if the traction member is below the anti-fall mechanism, the direction of the traction force can be changed through the steering sprocket, so that the chain always tightens the slider, compresses the spring, and thus the idler wheel is in an open state; if the traction member is above the anti-fall mechanism, there is no need to use a steering sprocket.

[0019] 4. This application uses brake cams. When braking, the gap between the cams will become smaller and smaller, which can achieve self-locking, shortening the brake triggering time, taking up less space, and lowering component costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will now be further described with reference to the following drawings.

[0021] Figure 1 It is a structural diagram of the lifting platform anti-fall mechanism described in this application;

[0022] Figure 2 Yes Figure 1 a side view schematic diagram of the structure shown;

[0023] Figure 3 Yes Figure 1 A schematic top view of the structure shown;

[0024] Figure 4 Yes Figure 1 The simplified structural diagram of the cargo platform side arm is shown;

[0025] Figure 5 This is a schematic diagram of the anti-fall state. DETAILED DESCRIPTION

[0026] Example 1, as Figures 1 to 5 As shown, the lifting platform anti-fall mechanism described in the present application includes a set of horizontally arranged anti-fall guide post seats 4 installed on the cargo platform side arms 100 by bolts, a set of guide posts 5 with two vertical ends respectively installed in parallel between the anti-fall guide post seats 4 by bolts and gaskets 13, a slider 7 connected by a self-lubricating bearing 14 is respectively sleeved between the guide posts 5 on both sides, and a compression spring 16 is sleeved on the guide posts 5 between the top anti-fall guide post seat 4 and the slider 7;

[0027] Connect a set of top screws 15 and nuts to the middle threaded hole of the anti-fall guide column seat 4 at the vertical bottom;

[0028] Furthermore, the spring sleeve 6 is fixed to the guide post 5 by a set screw 18 to prevent the sleeve 6 from sliding down under the action of gravity. The compression spring 16 is sleeved on the outer periphery of the spring sleeve 6, so that the spring sleeve 6 provides a guide and support track for the elastic deformation of the compression spring 16 and prevents the compression spring 16 from being crushed.

[0029] A chain tensioning seat 9 and a cam fork 10 are installed on the slider 7;

[0030] A set of arc-shaped holes 102 and a set of camshafts 101 are provided on the cargo platform side arm 100. A traction member 300 is connected to the side of the cargo platform side arm 100. The top of the traction member 300 is connected to a rope that pulls the cargo platform vertically up and down, and the bottom of the traction member 300 is connected to a sleeve 301 and a lifting plate 304. A spring 302 is provided between the traction member 300 and the lifting plate 304 and on the outside of the sleeve 301. A detection switch 303 is provided on one side of the lifting plate 304.

[0031] An anti-fall angle steel 200 is installed on the fixed device, and a pair of brake cams 8 are arranged opposite to each other between the anti-fall angle steels 200. The brake cams 8 are respectively suspended on the camshafts 101. A connecting rod 81 is sleeved on each brake cam 8. The connecting rod 81 is arranged in an arc-shaped hole 102 in a direction perpendicular to the cargo platform side arm 100, and the end of the connecting rod 81 is connected to the shift fork 10 after passing through.

[0032] At least one set of sprockets 3 mounted via sprocket seats 2 is provided on the cargo platform side arm 100. Figure 1 Two sets of sprockets 3 are shown, allowing the lower deflection sprocket to redirect the lifting force. This is determined by the relative position of the traction member 300 and the anti-fall mechanism. If the traction member 300 is above the chain tensioning seat 9 described below, the deflection sprockets are not required, and only one set of sprockets 3 is sufficient.

[0033] One end of the chain 17 is connected to the chain tensioning seat 9. After passing around the sprocket 3, the other end of the chain 17 is connected to the chain tensioning screw 1, which is installed on the traction member 300.

[0034] Under the lifting force of the traction member 300, the spring 302 is in a compressed state until the lifting plate 304 squeezes the sleeve 301 vertically and the lifting plate 304 contacts the detection switch 303;

[0035] At the same time, the traction force provided by the above-mentioned traction member 300 pulls the screw 1 upward through the chain 17, and the tension of the chain 17 is transmitted to the slider 7 to make the slider 7 rise vertically until the compression spring 16 is compressed and the spring sleeve 6 is squeezed; at this time, the fork 10 drives the connecting rod 81 to rise to prevent a pair of brake cams 8 from approaching each other under the action of gravity. The anti-fall angle steel 200, at this time, the cargo platform can be raised and lowered normally.

[0036] Furthermore, a detection plate 12 is installed on the slider 7, and a positioning switch 11 is installed on the cargo platform side arm 100; when the traction force provided by the above-mentioned traction member 300 vertically stretches the slider 7 through the chain 17 until the brake cam 8 is no longer in contact with the anti-fall angle steel 200, the detection plate 12 contacts the positioning switch 11.

[0037] like Figure 5As shown, when the rope connecting the traction member 300 vertically upward breaks, the upward traction force provided by the traction member 300 disappears. At this time, the lifting plate 304 moves vertically downward under the dual action of the elastic restoring force of the spring 302 and gravity and loses contact with the detection switch 303, thereby triggering the electrical alarm of rope breakage;

[0038] At the same time, the chain 17 also loses the pulling force provided by the traction member 300. The slider 7 moves downward along the guide column 5 under the dual action of the elastic restoring force of the compression spring 16 and gravity. The slider 7 drives the shift fork 10 to move downward. The shift fork 10 pushes the connecting rod 81 to slide in the long hole on the shift fork 10, thereby driving the pair of brake cams 8 to rotate around the fixed axis of the camshaft 101 respectively. The gap between the brake cam 8 and the anti-fall angle steel 200 gradually decreases.

[0039] When the braking cam 8 contacts the anti-falling angle steel 200, the braking cam 8 is subjected to the vertical upward friction resistance provided by the anti-falling angle steel 200, so that the braking cam 8 and the anti-falling angle steel 200 are self-locked together, and finally the cargo platform is prevented from falling through the cargo platform side arm 100;

[0040] Furthermore, in the process of the slider 7 moving downward through the fork 10 to drive the brake cam 8 to rotate around the camshaft 101, the detection plate 12 on the slider 7 disengages from the positioning switch 11 on the side of the cargo platform side arm 100 to trigger a brake signal alarm, which can further cause the cargo platform control system to shut down to prevent safety accidents.

[0041] In summary, the embodiments given in combination with the accompanying drawings are only preferred solutions for achieving the design purpose of this application. Other alternative structures directly deduced by those skilled in the art should also fall within the scope of protection of this application.

Claims

1. A lifting platform anti-fall mechanism, characterized in that : Includes a bolt mounted on the side arm of the cargo platform A set of horizontally arranged anti-falling guide post seats, the vertical ends of a set of guide posts are installed in parallel between the anti-falling guide post seats, sliders are respectively provided between the guide posts on both sides, compression springs are provided between the top anti-falling guide post seat and the slider and on the guide posts, and a chain tensioning seat and a cam fork are installed on the slider; A group of arc-shaped holes and a group of camshafts are provided on the side arms of the cargo platform. A traction member is connected to the side of the side arms of the cargo platform. The top end of the traction member is connected to a rope belt for pulling the cargo platform vertically up and down. The bottom end of the traction member is connected to a lifting plate. A spring is provided between the traction member and the lifting plate and on the outside of the sleeve. An anti-falling angle steel is vertically installed on the side arm of the cargo platform. A pair of brake cams are arranged opposite to each other between the anti-falling angle steels. The brake cams are respectively suspended on the camshafts. A connecting rod is sleeved on each brake cam. The connecting rod is arranged in an arc-shaped hole in a direction perpendicular to the side arm of the cargo platform. The end of the connecting rod is connected to the shift fork after passing through. At least one set of sprockets mounted through sprocket seats is provided on the side arms of the cargo platform; One end of the chain is connected to the chain tensioning seat, and after passing around the sprocket, the other end of the chain is connected to the chain tensioning screw, and the chain tensioning screw is installed on the traction member.

2. The lifting platform anti-fall mechanism according to claim 1, characterized in that: The spring sleeve is vertically fixed to the side arm of the cargo platform, and the compression spring is sleeved on the outer periphery of the spring sleeve.

3. The lifting platform anti-falling mechanism according to claim 1 or 2, characterized in that: A detection switch is arranged opposite to one side of the lifting plate. When the traction member is lifted by a lifting force and the spring is in a compressed state, the lifting plate squeezes the sleeve vertically and contacts the detection switch.

4. The lifting platform anti-falling mechanism according to claim 3, characterized in that: A detection plate is installed on the slider and a positioning switch is installed on the side arm of the cargo platform; when the traction force provided by the above-mentioned traction member vertically stretches the slider through the chain until the brake cam is no longer in contact with the anti-fall angle steel, the detection plate contacts the positioning switch.

5. A method for preventing a lift from falling using the anti-falling mechanism according to any one of claims 1 to 4, characterized in that: During normal lifting and lowering operations of the cargo platform, the traction force provided by the traction member pulls the screw rod upward through the chain, and the tension of the chain is transmitted to the slider to make the slider rise vertically until the compression spring is compressed and the spring sleeve is squeezed tight; the shift fork drives the connecting rod to rise to prevent the pair of brake cams from approaching each other under the action of gravity to prevent the anti-fall angle steel; When the rope connecting the traction member vertically upward breaks, the upward traction force provided by the traction member disappears, and the chain loses the tension provided by the traction member. The slider moves downward along the guide column under the dual action of the elastic restoring force of the compression spring and gravity. The slider drives the shift fork downward, and the shift fork pushes the connecting rod to slide in the long hole on the shift fork, thereby driving a pair of brake cams to rotate around the fixed axis of the camshaft respectively, and the gap between the brake cam and the anti-fall angle steel gradually decreases; When the brake cam contacts the anti-fall angle steel, the brake cam is subjected to the vertical upward friction resistance provided by the anti-fall angle steel, so that the brake cam and the anti-fall angle steel are self-locked together, and finally the cargo platform is prevented from falling through the cargo platform side arm.

6. The anti-falling method according to claim 5, characterized in that: When the upward traction provided by the traction member disappears, the lifting plate moves vertically downward under the dual action of the elastic restoring force of the spring and gravity and loses contact with the detection switch, triggering an electrical alarm of rope breakage.

7. The anti-falling method according to claim 5 or 6, characterized in that: When the slider moves downward through the fork to drive the brake cam to rotate around the camshaft, the detection plate on the slider disengages from the positioning switch on the side of the cargo platform side arm, triggering a brake signal alarm.

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