Fall arrest linkage protection apparatus and method for stacker

Abstract

A fall arrest linkage protection apparatus and method for a stacker. The fall arrest linkage protection apparatus for a stacker comprises speed governor levers (3) that are fixedly connected to steel cables (10) and vertically move together along with the steel cables (10); the speed governor levers (3) are respectively connected, by means of two braking cables, to two safety gear levers (5) located on two sides of a bearing platform (200) and control the two safety gear levers (5) in a linkage manner; steel cable lifting assemblies (7) and the safety gear levers (5) are respectively provided on two sides of a frame of the bearing platform (200); a first linkage braking cable (503) and a second linkage braking cable (504) are respectively connected between the two safety gear levers (5). When the bearing platform (200) is overspeed, any steel cable breaks, or a safety gear (6) on any side clamps a rail, the safety gears (6) on two sides can simultaneously start safety operation, thereby implementing a linkage fall arrest protection mechanism on two sides of the bearing platform, and protecting the safety of on-site personnel, devices, and goods carried by the bearing platform to the maximum extent.

Description

Stacker crane anti-fall linkage protection device and method

[0001] Citing Join

[0002] This application claims priority to Chinese Patent Application No. 2024109340214, filed on July 12, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to a fall protection device and its control method for a cargo platform of a double-column stacker crane, belonging to the field of logistics and warehousing technology. Background Technology

[0004] Currently, various types of lifting equipment are commonly used in automated warehousing operations. For example, stacker cranes use steel cables to pull the loading platform, transferring goods between different working heights. The loading platform's load-bearing components are typically made of steel cables or lifting chains. After prolonged use under heavy loads, there is a safety hazard of localized damage or even breakage of these components. In such cases, the loading platform would fall freely, potentially causing a serious accident and injuring personnel and other equipment in the work area. Therefore, it is usually necessary to design and install relevant fall protection mechanisms in advance to prevent accidental falls of the loading platform's load-bearing components.

[0005] Current fall protection systems mainly consist of a speed limiter and a brake caliper. When the speed limiter detects that the loading platform is descending too fast, it triggers the brake caliper to engage, thereby clamping the brake rail to prevent the loading platform from falling. The main drawbacks and shortcomings of current fall protection technology are: First, when the lifting cable breaks, the safety caliper cannot be triggered immediately. The speed limiter only activates when the loading platform unexpectedly descends and accelerates to a set value after the cable breaks, posing a significant safety risk. Second, in existing double-column stacker cranes, where the loading platform is lifted by two steel cables, if a single cable breaks, the loading platform will tilt and not immediately fall, meaning the speed limiter cannot activate immediately or may not activate at all. Third, in existing double-column stacker cranes, if only one of the two lifting cables breaks, the safety calipers on both sides cannot be triggered simultaneously, leading to the loading platform tilting and the risk of goods sliding to one side and collapsing.

[0006] Application content

[0007] The stacker crane anti-fall linkage protection device and method described in this application aim to solve the problems existing in the prior art by proposing a linkage mechanism and control principle that connects the safety clamps on both sides simultaneously through a set of speed limiter levers. This is intended to ensure that when the loading platform overspeeds, any set of wire ropes breaks, or any safety clamp on one side is gripping the rail, the safety clamps on both sides can be activated simultaneously for safe operation, thereby realizing a linkage anti-fall protection mechanism on both sides of the loading platform and maximizing the safety of on-site personnel, equipment, and goods carried by the loading platform.

[0008] To achieve the above design objectives, the stacker crane's fall protection device includes a speed limiter lever fixedly connected to the wire rope and running vertically along with it. The wire rope runs in a closed loop between the speed limiter and the upper pulley. The speed limiter lever is also connected to one side of the loading platform and moves synchronously with the platform. The speed limiter lever is connected to and controls two sets of safety clamp levers located on both sides of the loading platform via two sets of first and second brake ropes. The two sets of safety clamp levers on both sides of the loading platform have the same structure but are positioned opposite each other. Each set of safety clamp levers is connected to and triggers the safety clamp on the same side of the loading platform. When the wire rope pulling the loading platform breaks, the safety lever controls the safety clamp on the same side to engage the rail clamping operation. Each set of wire ropes that pulls and controls the lifting and lowering of the loading platform is connected to a set of wire rope lifting components. On one side of the loading platform, a set of wire rope lifting components and a set of safety clamp levers are respectively set on both sides of the loading platform frame. A first linkage brake rope and a second linkage brake rope are respectively connected between the two sets of safety clamp levers. When one set of safety clamp levers triggers the rail clamping operation on the same side, the other set of safety clamp levers will be triggered to engage the rail clamping operation under the action of the first linkage brake rope or the second linkage brake rope.

[0009] In one embodiment, the speed limiter lever includes two sets of vertically connected wedge-shaped joints to fix the free ends of the wire ropes respectively. One end of the lever is fixedly connected to one side of the wedge-shaped block connecting plate, and the other end of the lever is axially mounted on the rotating fixed seat. The lever can rotate around the axial end of the rotating fixed seat, which is fixedly connected to one side of the loading platform. The lever is suspended and connected to a first brake rope and a second brake rope. The rotating fixed seat and the bending plate are both fixedly connected to one side of the loading platform. The speed limiter lever moves synchronously with the vertical lifting and lowering of the loading platform. The first brake rope and the second brake rope are respectively connected to safety clamp levers located on both sides of the loading platform.

[0010] In one embodiment, the safety clamp lever includes a rotating fixed base, a lower fixed plate, and an upper fixed plate, which are respectively fixedly connected to one side of the loading platform; the clamp lever shaft is located on the rotating fixed base and can rotate around the axis of the rotating fixed base; one end of the clamp lever is connected to the safety clamp; the other end of the clamp lever is respectively suspended and connected to a first brake rope or a second brake rope, as well as a first linkage brake rope and a second linkage brake rope; the first linkage brake rope and the second linkage brake rope are respectively connected between two sets of safety clamp levers located on both sides of the loading platform.

[0011] In one embodiment, the clamp lever is suspended at one end of the chain, and the other end of the chain is connected to the chain screw. The chain screw is fixedly connected to the wire rope lifting assembly located on the same side of the loading platform, which controls the lifting and lowering of the loading platform.

[0012] In one embodiment, the lower connecting plate of the wire rope lifting assembly passes through the side wall of the loading platform, and the lower connecting plate is connected to the chain and chain screw of the safety clamp lever.

[0013] In one embodiment, the wire rope lifting assembly includes a lifting wedge joint that clamps the free end of the wire rope, and a rotating shaft that axially connects the lifting wedge joint and the top end of the pull rod; the middle of the pull rod is fitted with two sets of limiting plates fixed to one side of the loading platform; a preload spring, a lower connecting plate, and a nut are sleeved on the pull rod below the limiting plates and via spring sleeves; one end of the preload spring presses against the limiting plate, and the other end presses against the lower connecting plate, and the nut is positioned on the lower connecting plate from bottom to top.

[0014] In one embodiment, a limit switch is installed at the bottom of the limit plate via a limit switch mounting plate. The limit switch abuts against the lower connecting plate and monitors the vertical height change of the lower connecting plate.

[0015] Based on the structural design of the stacker crane anti-fall linkage protection device described above, this application also proposes the following stacker crane anti-fall linkage protection method:

[0016] The loading platform is vertically slidably connected between the two side frames of the stacker crane. A fall protection linkage device is connected to one side of the loading platform. The fall protection linkage device of the stacker crane includes a speed limiter lever fixedly connected to the wire rope and running vertically with the wire rope. The speed limiter lever is also connected to one side of the loading platform and rises and falls synchronously with the loading platform. When the speed limiter lever rises and falls, it drives the wire rope to rise and fall, and then the wire rope drives the speed limiter and the upper pulley to rotate. The speed limiter lever is connected to and controls two sets of safety clamp levers located on both sides of the loading platform through a first brake rope and a second brake rope, respectively. The speed limiter lever is connected to a set of safety clamp levers located on the left side of the loading platform. The two sets of safety clamp levers on both sides of the loading platform have the same structure but are set in opposite positions. When the loading platform loses speed or exceeds speed, the abnormal speed is fed back to the speed limiter lever. The lever rotates clockwise around the axis of the rotating fixed seat. The lever simultaneously pulls the first brake rope and the second brake rope upward, thereby simultaneously controlling the two sets of safety clamps located on both sides of the loading platform. The wedge blocks of the safety clamps are lifted upward to achieve a clamping and braking action with the guide rail, so that the loading platform can stop in its original position and avoid falling.

[0017] In one embodiment, when any of the steel wire ropes used to lift and lower the loading platform breaks, the lower connecting plate of the steel wire rope lifting assembly on that side descends vertically under the combined action of the pull rod and the preload spring. The lower connecting plate is connected to the chain of the safety clamp lever. The descent of the lower connecting plate will cause the clamp lever to rotate clockwise around the rotating fixed seat through the chain. This set of clamp levers will drive the wedge block of the safety clamp located on the same side of the loading platform to rise upward to trigger the rail clamping operation. At the same time, the first linkage brake rope or the second linkage brake rope connected to the two sets of safety clamp levers located on both sides of the loading platform will simultaneously trigger the other set of safety clamp levers. That is, the safety clamp on the other side will drive the wedge block of the safety clamp to rise upward through the clockwise rotation of the clamp lever around the rotating fixed seat, thereby realizing the synchronous triggering of the rail clamping operation by the two sets of safety clamps.

[0018] In one embodiment, when the loading platform is operating normally, the lever is pulled downward by the tension spring connected to the bottom of the suspension, the lever is in a horizontal state and will not rotate, the wire rope runs in a closed loop trajectory formed by the speed limiter and the upper pulley, the lifting speed of the wire rope does not exceed the limit value of the speed limiter, the speed limiter will not be triggered, and the entire anti-fall linkage protection device is in a non-triggered state.

[0019] In summary, the stacker crane fall protection device and method described in this application have the following advantages:

[0020] 1. Compared with the prior art, the stacker crane has more complete safety anti-fall protection measures. Once the loading platform exceeds the speed limit, it can trigger the safety clamps on both sides to run on the rail simultaneously without reaching the peak value set by the prior art. The equipment has a high safety factor and effectively ensures the safety of on-site equipment and operators.

[0021] 2. This application can trigger the safety clamps on both sides to operate in conjunction when any one or two sets of lifting steel wire ropes break, thereby ensuring that the loading platform remains stable and that the cargo does not slip or collapse.

[0022] 3. The overall device of this application is simpler and more economical. It adopts an internal flexible brake line arrangement scheme to achieve a stable connection between the safety clamps on both sides and to prevent interference and influence from the operation of other components. Attached Figure Description

[0023] The present application will now be further illustrated with reference to the following figures.

[0024] Figure 1 is a schematic diagram of a stacker crane using the anti-fall linkage protection device described in this application;

[0025] Figure 1-A is an enlarged schematic diagram of part A in Figure 1;

[0026] Figure 1-B is a schematic diagram of a speed limiter;

[0027] Figure 1-C is a schematic diagram of the upper pulley;

[0028] Figure 2-A is a schematic diagram of the speed limiter lever connecting to the left safety clamp lever;

[0029] Figure 2-B is a schematic diagram of the speed limiter lever;

[0030] Figures 2-C and 2-D are schematic diagrams of the structure and connection of the safety clamp levers on both sides, respectively.

[0031] Figure 3-A is a schematic diagram of the left-side safety clamp lever connected to the wire rope lifting assembly located on the left side of the loading platform;

[0032] Figure 3-B is a schematic diagram of the steel wire rope lifting assembly;

[0033] Figure 3-C is a cross-sectional view of the structure shown in Figure 3-B;

[0034] Figure 4 is a schematic diagram of the operation of the safety clamps on both sides of a speed limiter lever linkage;

[0035] Reference numerals: 100, Stacker crane; 200, Loading platform; 10, Wire rope; 1, Speed ​​limiter; 2, Upper pulley; 3, Speed ​​limiter lever; 5, Safety gear lever; 6, Safety gear; 7, Wire rope lifting assembly; 10, Wire rope; 101, Limit bracket; 102, Speed ​​limiting element; 103, Counterweight; 201, Wire rope pulley; 202, Upper pulley bracket; 203, Limit cover; 401, Wedge joint; 402, Wedge block shaft; 403, Wedge block connecting plate; 404, Lever; 405, Rotating fixed seat; 406, Tension spring; 407, First brake rope; 408, Second brake rope; 409, Adjusting screw; 41 0. Bending plate; 501. Clamp lever; 502. Rotating fixed seat; 503. First linkage brake rope; 504. Second linkage brake rope; 505. Chain; 506. Chain screw; 507. Lower fixed plate; 508. Upper fixed plate; 701. Lifting wedge joint; 702. Rotating shaft; 703. Pull rod; 704. Limit plate; 705. Preload spring; 706. Lower connecting plate; 707. Limit switch; 708. Limit switch mounting plate; 709. Spring sleeve; 710. Nut. Detailed Implementation

[0036] Example 1, as shown in Figures 1 and 1-A, proposes a double-column stacker crane 100 that applies the anti-fall linkage protection device described in this application. The loading platform 200 is vertically slidably connected between the two side frames of the stacker crane 100, and the anti-fall linkage protection device is connected to one side of the loading platform 200.

[0037] The stacker crane anti-fall linkage protection device includes a speed limiter lever 3 fixedly connected to the wire rope 10 and running vertically together with the wire rope 10. The wire rope 10 runs in a closed loop between the speed limiter 1 and the upper pulley 2. The speed limiter lever 3 is also connected to one side of the loading platform 200 and rises and falls synchronously with the loading platform 200.

[0038] When the speed limiter lever 3 is raised or lowered, it will drive the wire rope 10 to rise or fall, and then the wire rope 10 will drive the speed limiter 1 and the upper pulley 2 to rotate. When the descent speed of the loading platform 200 exceeds the set value of the speed limiter 1, the speed limiter 1 will be triggered and stop rotating. Therefore, the wire rope 10 is forced to stop running, and the speed limiter lever 3 will prevent the loading platform 200 from continuing to descend.

[0039] As shown in Figure 1-B, the speed limiter 1 includes a limiting bracket 101 connected to one side of the stacker crane 100 frame. A counterweight 103 is fixedly connected to the limiting bracket 101. A speed limiting element 102 is installed on the counterweight 103. Through the counterweight 103, the speed limiting element 102 is always subjected to a downward pulling force, so the wire rope 10 can always be kept taut. The speed limiting element 102 is an industry standard component. A rotating pulley for winding and connecting the wire rope 10 is provided on the speed limiting element 102. When the linear speed of the wire rope 10 exceeds a certain value, the rotating pulley of the speed limiting element 102 will stop rotating and brake the wire rope 10 through friction, thereby preventing the loading platform 200 from continuing to rise and fall.

[0040] As shown in Figure 1-C, the upper pulley 2 includes an upper pulley bracket 202 fixedly connected to one side of the frame of the stacker crane 100, a wire rope pulley 201 with a wire rope 10 wound around it is mounted on the upper pulley bracket 202, and a limiting cover 203 is provided around the wire rope pulley 201. The end of the limiting cover 203 is fixed to the upper pulley bracket 202 to limit the wire rope 10 and prevent it from detaching from the wire rope pulley 201 during operation.

[0041] The speed limiter lever 3 is connected to and controls two sets of safety clamp levers 5 located on both sides of the loading platform via two sets of brake cables, as shown in Figure 2-A. The speed limiter lever 3 is connected to a set of safety clamp levers 5 located on the left side of the loading platform 200. The two sets of safety clamp levers 5 located on both sides of the loading platform 200 have the same structure but are set in opposite positions.

[0042] As shown in Figure 2-B, the speed limiter lever 3 includes two sets of vertically connected wedge-shaped joints 401 for fixing the free ends of the wire rope 10. The two sets of wedge-shaped joints 401 are axially penetrated by a set of wedge-shaped block shafts 402 and connected to both ends of the wedge-shaped block connecting plate 403. The free ends of the wire rope 10 are wrapped around the wedge-shaped block shafts 402 and clamped by the wedge-shaped joints 401 and the wedge-shaped block connecting plate 403.

[0043] One end of lever 404 is fixedly connected to one side of wedge block connecting plate 403 by bolts. The other end of lever 404 is axially mounted on rotating fixed seat 405. Lever 404 can rotate around the axial end of rotating fixed seat 405. Rotating fixed seat 405 is fixedly connected to one side of loading platform 200.

[0044] Lever 404 is suspended at one end of tension spring 406, and the other end of tension spring 406 is connected to adjusting screw 409. Adjusting screw 409 is sleeved on bending plate 410 and its positioning height can be adjusted vertically along bending plate 410 to adjust the tension of tension spring 406 relative to lever 404. Bending plate 410 is fixedly connected to one side of loading platform 200.

[0045] The lever 404 simultaneously suspends and connects the first brake rope 407 and the second brake rope 408. The exterior of both the first brake rope 407 and the second brake rope 408 are vertically fixed to the bending plate 410 through bushings. The first brake rope 407 and the second brake rope 408 are connected in the above-mentioned manner by being arranged inside the bushings, which helps to achieve a stable connection with the safety clamps 6 on both sides and is not affected by the operation of other components such as the loading platform 200.

[0046] The rotating fixed base 405 and the bending plate 410 are both fixedly connected to one side of the loading platform 200. Therefore, the speed limiter lever 3 moves synchronously with the vertical lifting and lowering of the loading platform 200. When the loading platform 200 loses speed or exceeds speed, the abnormal speed is fed back to the speed limiter lever 3. The lever 404 rotates clockwise around the axis of the rotating fixed base 405. The lever 404 pulls the first brake rope 407 and the second brake rope 408 upwards, thereby simultaneously controlling the safety clamp 6. The wedge block of the safety clamp 6 is lifted upwards to achieve the clamping and braking action with the guide rail. The two sets of safety clamps 6 located on both sides of the loading platform move along the rail at the same time, so that the loading platform 200 can be safely stopped in its original position to avoid falling and ensure the safety of on-site personnel, equipment and goods.

[0047] As shown in Figures 2-C and 2-D, the two sets of safety clamp levers 5 have the same structure and are symmetrically distributed on both sides of the loading platform 200. The safety clamp lever 5 on the left side includes a rotating fixed base 502, a lower fixed plate 507, and an upper fixed plate 508, all fixedly connected to one side of the loading platform 200. The clamp lever 501 is pivotally mounted on the rotating fixed base 502 and can rotate around the pivot point of the rotating fixed base 502. One end of the clamp lever 501 is connected to the safety clamp 6, and the other end of the clamp lever 501 is suspended and connected to the first brake rope 407, the first linkage brake rope 503, and the second linkage brake rope 504. The first linkage brake rope 503 and the second linkage brake rope 504 are respectively connected between the two sets of safety clamp levers 5 located on both sides of the loading platform.

[0048] The outer sides of the first brake rope 407 and the first linkage brake rope 503 are respectively fixedly connected to the lower fixing plate 507 through bushings, and the outer side of the second linkage brake rope 504 is fixedly connected to the upper fixing plate 508 through bushings.

[0049] The clamp lever 501 is suspended from one end of a chain 505, and the other end of the chain 505 is connected to a chain screw 506. The chain screw 506 is fixedly connected to a wire rope lifting assembly 7 located on the same side of the loading platform, which controls the lifting and lowering of the loading platform. By adjusting the chain screw 506, the vertical height difference between the safety clamp lever 5 and the wire rope lifting assembly 7 can be adjusted accordingly, thereby adjusting the tension between the two.

[0050] Based on the same design principle, the safety clamp lever 5 located on the right side of the loading platform includes a rotating fixed seat 502, a lower fixed plate 507, and an upper fixed plate 508, which are respectively fixedly connected to one side of the loading platform 200. The clamp lever 501 is axially mounted on the rotating fixed seat 502 and can rotate around the axis of the rotating fixed seat 502. One end of the clamp lever 501 is connected to the safety clamp 6, and the other end of the clamp lever 501 is respectively connected to the second brake rope 408, the first linkage brake rope 503, and the second linkage brake rope 504. The exterior of the second brake rope 408 and the second linkage brake rope 504 are respectively fixedly connected to the lower fixed plate 507 through bushings, and the exterior of the first linkage brake rope 503 is fixedly connected to the upper fixed plate 508 through bushings.

[0051] The clamp lever 501 is suspended and connected to one end of the chain 505, and the other end of the chain 505 is connected to the chain screw 506.

[0052] The chain screw 506 here is fixedly connected to the wire rope lifting assembly 7 located on the right side of the loading platform, which controls the lifting and lowering of the loading platform. By adjusting the chain screw 506, the vertical height difference between the safety clamp lever 5 and the wire rope lifting assembly 7 can be adjusted accordingly, thereby adjusting the tension between the two.

[0053] As shown in Figures 3-A to 3-C, each set of wire ropes that pulls and controls the lifting and lowering of the loading platform is connected to a set of wire rope lifting components 7. On one side of the loading platform, a set of wire rope lifting components 7 and a set of safety levers 5 are respectively set on both sides of the loading platform frame.

[0054] In order to achieve the lifting and lowering of the loading platform, the lower connecting plate 706 of the wire rope lifting assembly 7 passes through the side wall of the loading platform and is connected to the chain 505 and chain screw 506 of the safety clamp lever 5. When any set of wire ropes breaks, the lower connecting plate 706 pulls the chain 505 and chain screw 506 downward, and the clamp lever 501 located on the same side of the loading platform rotates clockwise around the axis of the rotating fixed seat 502, driving the safety clamp 6 to lift upward and run along the rail by the wedge block. At the same time, when the clamp lever 501 rotates clockwise, it drives another set of safety clamp levers 5 located on the other side of the loading platform to rotate synchronously through the first linkage brake rope 503 or the second linkage brake rope 504. Then, the safety clamp lever 5 on that side triggers the rail-clamping operation of the safety clamp 6 on the same side. Thus, when any wire rope pulling the loading platform breaks, the two sets of safety clamp levers 5 simultaneously control the safety clamps 6 on both sides to perform rail-clamping operation.

[0055] Specifically, the wire rope lifting assembly 7 includes a lifting wedge joint 701 that fixes and clamps the free end of the wire rope, and a rotating shaft 702 that axially connects the lifting wedge joint 701 and the top end of the pull rod 703.

[0056] The middle part of the tie rod 703 is fitted with two sets of limiting plates 704 fixed on one side of the loading platform to prevent the tie rod 703 from rotating through the lifting wedge joint 701, so as to maintain the traction and control of the lifting wire rope of the loading platform in a stable state.

[0057] Below the limiting plate 704, on the pull rod 703, a preload spring 705, a lower connecting plate 706, and a nut 710 are fitted on the pull rod 703 via a spring sleeve 709. One end of the preload spring 705 presses against the limiting plate 704, and the other end presses against the lower connecting plate 706. The nut 710 is positioned on the lower connecting plate 706 from bottom to top. The nut 710 sequentially limits and supports the lower connecting plate 706, the preload spring 705, and the spring sleeve 709 fitted on the outer periphery of the pull rod 703 to prevent them from falling off. It is also the overall weight-bearing point during the lifting and lowering of the loading platform by the wire rope. Therefore, the nut 710 and the pull rod 703 are connected and fastened by internal and external threads.

[0058] Specifically, the lifting traction force applied to the loading platform by the wire rope through the lifting wedge joint 701 is ultimately transmitted to the nut 710 through the rotating shaft 702 and the pull rod 703. The nut 710 then transmits the lifting force to the spring sleeve 709 and the limiting plate 704 in sequence. Relying on the fixed connection between the limiting plate 704 and one side of the loading platform, the wire rope can lift and pull the loading platform 200, and the loading platform 200 can be driven to rise and fall.

[0059] If any of the steel wire ropes used to lift and lower the loading platform breaks, the pull rod 703 will fall between the two sets of limiting plates 704 under its own weight. The preload of the preload spring 705 will be released, which will help the lower connecting plate 706 to descend vertically relative to the limiting plate 704. At this time, under the combined action of the above, the lower connecting plate 706 will drive the chain 505 and chain screw 506 in a set of safety clamp levers 5 on the same side of the loading platform to descend vertically. This will cause the clamp lever 501 in the set of safety clamp levers 5 to rotate clockwise around the axis of the rotating fixed seat 502, and finally realize the upward lifting of the safety clamp 6 and its movement along the rail by the wedge block.

[0060] Based on the same technical principle, when any set of safety clamp levers 5 of the loading platform triggers the safety clamp 6 on the same side to clamp onto the rail, the first linkage brake rope 503 and the second linkage brake rope 504 between the two sets of safety clamp levers 5 on both sides of the loading platform are interconnected. When one set of safety clamp levers 5 triggers the safety clamp 6 to clamp onto the rail, that is, when any set of clamp levers 501 rotates clockwise around the axis set point of the rotating fixed seat 502, the first linkage brake rope 503 or the second linkage brake rope 504 drives the other set of clamp levers 501 to rotate clockwise synchronously around the axis set point of the rotating fixed seat 502. The clamp lever 501 simultaneously triggers the same set of safety clamps 6 to lift upward to clamp onto the rail, thereby realizing the linkage operation of the two sets of safety clamps 6 to clamp onto the rail together. The loading platform is passively braked, stops falling, and maintains the same vertical height on both sides. This not only ensures the safety of on-site personnel and equipment, but also avoids safety accidents caused by cargo falling due to the tilt of the loading platform.

[0061] In addition, a limit switch 707 can be installed at the bottom of the limit plate 704 via a limit switch mounting plate 708. The limit switch 707 abuts against the lower connecting plate 706. When the wire rope for lifting and lowering the traction loading platform breaks and the pull rod 703 causes the lower connecting plate 706 to descend vertically, the limit switch 707 detects the change in the vertical height of the lower connecting plate 706 and can send an alarm signal to the control system, thereby triggering safety measures.

[0062] Based on the structural design of the aforementioned anti-fall linkage protection device, this embodiment proposes the following anti-fall linkage protection method for the loading platform 200 of a double-column stacker crane 100: The loading platform 200 is vertically slidably connected between the frames on both sides of the stacker crane 100, and an anti-fall linkage protection device is connected to one side of the loading platform 200; the stacker crane anti-fall linkage protection device includes a speed limiter lever 3 fixedly connected to the wire rope 10 and running vertically together with the wire rope 10; the wire rope 10 runs in a closed loop between the speed limiter 1 and the upper pulley 2; the speed limiter lever... 3 is simultaneously connected to one side of the loading platform 200 and rises and falls synchronously with the loading platform 200; when the speed limiter lever 3 rises and falls, it will drive the wire rope 10 to rise and fall, and then the wire rope 10 will drive the speed limiter 1 and the upper pulley 2 to rotate; the speed limiter lever 3 is connected to and controls two sets of safety clamp levers 5 located on both sides of the loading platform through the first brake rope 407 and the second brake rope 408 respectively. The speed limiter lever 3 is connected to a set of safety clamp levers 5 located on the left side of the loading platform 200. The two sets of safety clamp levers 5 located on both sides of the loading platform 200 have the same structure and are set in opposite positions.

[0063] When the loading platform 200 is in normal lifting and lowering operation, the lever 404 is pulled downward by the tension spring 406 suspended at the bottom. The lever 404 is in a horizontal state and will not rotate. The wire rope 10 runs in the closed loop trajectory formed by the speed limiter 1 and the upper pulley 2. The lifting speed of the wire rope 10 does not exceed the limit value of the speed limiter 1, so the speed limiter 1 will not be triggered. The entire anti-fall linkage protection device is in a non-triggered state.

[0064] The speed limiter lever 3 includes two sets of vertically connected wedge-shaped joints 401 for fixing the free ends of the wire rope 10. One end of the lever 404 is fixedly connected to one side of the wedge-shaped block connecting plate 403 by bolts. The other end of the lever 404 is axially mounted on the rotating fixed seat 405. The lever 404 can rotate around the axial end of the rotating fixed seat 405. The rotating fixed seat 405 is fixedly connected to one side of the loading platform 200. The lever 404 is suspended and connected to the first brake rope 407 and the second brake rope 408. The speed limiter lever 3 moves synchronously with the vertical lifting and lowering of the loading platform 200.

[0065] Two sets of safety clamp levers 5 have the same structure and are symmetrically distributed on both sides of the loading platform 200. Each safety clamp lever 5 includes a rotating fixed seat 502 that is fixedly connected to one side of the loading platform 200. The clamp lever 501 is pivotally located on the rotating fixed seat 502 and can rotate around the pivotally located of the rotating fixed seat 502. One end of the clamp lever 501 is connected to the safety clamp 6, and the other end of the clamp lever 501 is suspended and connected to the first brake rope 407 or the second brake rope 408 respectively.

[0066] When the loading platform 200 loses speed or exceeds speed, the abnormal speed is fed back to the speed limiter lever 3. The lever 404 rotates clockwise around the axis of the rotating fixed base 405. The lever 404 simultaneously pulls the first brake rope 407 and the second brake rope 408 upward, thereby simultaneously controlling the two sets of safety clamps 6 located on both sides of the loading platform. The wedge-shaped blocks of the safety clamps 6 are lifted upward to achieve a clamping and braking action with the guide rail. The loading platform 200 is able to safely stop in its original position, avoid falling, and ensure the safety of on-site personnel, equipment and goods.

[0067] Specifically, when the loading platform 200 drives the speed limiter lever 3 and the wire rope 10 to descend too quickly, the speed limiter 1 pulley speed exceeds the set value, the speed limiter 1 is triggered, its pulley stops rotating, and the wire rope 10 slides and rubs inside the speed limiter 1 pulley, causing the wire rope 10 to pull the lever 404 in the speed limiter lever 3 to rotate clockwise around the rotating fixed seat 405. In one embodiment, the rotation of the lever 404 will pull the first brake rope 407 and the second brake rope 408 to drive the two sets of safety clamp levers 5 located on both sides of the loading platform to move together, thereby controlling the wedges of the two sets of safety clamps 6 to move upward to simultaneously trigger the braking action of the clamping guide rail.

[0068] The two sets of safety clamp levers 5 are symmetrically distributed on both sides of the loading platform 200. The clamp lever 501 is mounted on the rotating fixed seat 502 and can rotate around the axis of the rotating fixed seat 502. One end of the clamp lever 501 is connected to the safety clamp 6, and the other end of the clamp lever 501 is respectively suspended and connected to the first linkage brake rope 503 and the second linkage brake rope 504. The first linkage brake rope 503 and the second linkage brake rope 504 are respectively connected to the two sets of safety clamp levers 5 located on both sides of the loading platform.

[0069] Meanwhile, the clamp lever 501 is suspended at one end of the chain 505, and the other end of the chain 505 is connected to the chain screw 506. The chain screw 506 is fixedly connected to the wire rope lifting assembly 7 located on the same side of the loading platform, which controls the lifting and lowering of the loading platform. By adjusting the chain screw 506, the vertical height difference between the safety clamp lever 5 and the wire rope lifting assembly 7 can be adjusted accordingly, thereby adjusting the tension between the two.

[0070] Each set of wire ropes that pulls and controls the lifting and lowering of the loading platform is connected to a set of wire rope lifting components 7. On one side of the loading platform, a set of wire rope lifting components 7 and a set of safety levers 5 are respectively set on both sides of the loading platform frame.

[0071] The lower connecting plate 706 of the wire rope lifting assembly 7 passes through the side wall of the loading platform and connects the chain 505 and chain screw 506 of the safety clamp lever 5. When any set of wire ropes breaks, the lower connecting plate 706 pulls the chain 505 and chain screw 506 downward, causing the clamp lever 501, located on the same side of the loading platform, to rotate clockwise around the axis of the rotating fixed seat 502, driving the safety clamp 6 to lift upward and run along the rail by the wedge block. At the same time, when the clamp lever 501 rotates clockwise, it drives another set of safety clamp levers 5 located on the other side of the loading platform to rotate synchronously through the first linkage brake rope 503 or the second linkage brake rope 504. Then, the safety clamp lever 5 on that side simultaneously triggers the rail-clamping operation of the safety clamp 6 on the same side. Thus, when any wire rope pulling the loading platform breaks, the two sets of safety clamp levers 5 simultaneously control the safety clamps 6 on both sides to perform rail-clamping operation.

[0072] Specifically, when any of the steel wire ropes that pull the loading platform to lift and lower breaks, the lower connecting plate 706 of the steel wire rope lifting assembly 7 on that side will descend vertically under the combined action of the pull rod 703 and the preload spring 705. Since the lower connecting plate 706 is connected to the chain 505 of the safety clamp lever 5, the descent of the lower connecting plate 706 will pull the clamp lever 501 to rotate clockwise around the rotating fixed seat 502 through the chain 505. The clamp lever 501 will drive the wedge block of the safety clamp located on the same side of the loading platform to lift upward to trigger the rail clamping operation.

[0073] At the same time, the first linkage brake rope 503 or the second linkage brake rope 504 connected to the two sets of safety clamp levers 5 located on both sides of the loading platform simultaneously triggers the other set of safety clamp levers 5. That is, the other safety clamp 6 drives the wedge block of the safety clamp to rise upward by rotating the clamp lever 501 around the rotating fixed seat 502 clockwise, thereby realizing the synchronous triggering of the two sets of safety clamps 6 to grip the rail.

[0074] In summary, the embodiments given in conjunction with the accompanying drawings are merely preferred solutions for achieving the design objectives of this application. Other alternative structures directly derived by those skilled in the art should also fall within the protection scope of this application.

Claims

1. A stacker crane anti-fall linkage protection device, characterized in that, include: Speed ​​limiter lever; The wire rope, the speed limiter lever is fixedly connected to the wire rope and runs vertically together with the wire rope; Speed ​​limiter; The upper pulley, the wire rope runs in a closed loop between the speed limiter and the upper pulley, and the speed limiter lever is simultaneously connected to one side of the loading platform and rises and falls synchronously with the loading platform; First brake cable and second brake cable; The safety clamp lever, the speed limiter lever, is connected and linked by two sets of first brake ropes and second brake ropes respectively to control two sets of safety clamp levers located on both sides of the loading platform. The two sets of safety clamp levers located on both sides of the loading platform have the same structure but are set in opposite positions. Safety clamps, each set of safety clamp levers is connected to and triggers the control of the safety clamps located on the same side of the loading platform. When the steel wire rope pulling the loading platform breaks, the safety clamp lever controls the safety clamps on the same side to perform rail clamping operation. A wire rope lifting assembly is provided. Each set of wire ropes that pulls and controls the lifting and lowering of the loading platform is connected to a set of wire rope lifting assemblies. On one side of the loading platform, a set of wire rope lifting assemblies and a set of safety clamp levers are respectively set on both sides of the frame of the loading platform. A first linkage brake rope and a second linkage brake rope are respectively connected between the two sets of safety clamp levers. When one set of safety clamp levers triggers the safety clamp to grip the rail on the same side, the other set of safety clamp levers will trigger the safety clamp to grip the rail under the action of the first linkage brake rope or the second linkage brake rope.

2. The stacker crane anti-fall linkage protection device according to claim 1, characterized in that: The speed limiter lever includes: A wedge joint, comprising two sets of vertically aligned wedge joints for securing the free ends of the wire ropes respectively. Wedge-shaped connecting plate; A lever, wherein one end of the lever is fixedly connected to one side of the wedge-shaped connecting plate; A rotating fixed base is provided, with the other end of the lever axially mounted on the rotating fixed base. The lever can rotate around the axial end of the rotating fixed base, and the rotating fixed base is fixedly connected to one side of the loading platform. The bending plate, the lever suspension connection between the first brake rope and the second brake rope, the rotating fixed seat and the bending plate are both fixedly connected to one side of the loading platform, and the speed limiter lever as a whole moves synchronously with the vertical lifting and lowering of the loading platform; The first brake rope and the second brake rope are respectively connected to the safety clamp levers located on both sides of the loading platform.

3. The stacker crane fall prevention linkage protection device according to claim 1, characterized in that: The safety clamp lever includes a rotating fixed base, a lower fixed plate, and an upper fixed plate, which are respectively fixedly connected to one side of the loading platform; The safety clamp lever also includes a clamp lever shaft disposed on the rotating fixed base and rotatable about the axis of the rotating fixed base. One end of the clamp lever is connected to the safety clamp, and the other end of the clamp lever is respectively suspended and connected to the first brake rope or the second brake rope, as well as the first linkage brake rope and the second linkage brake rope. The first linkage brake rope and the second linkage brake rope are respectively connected between two sets of safety clamp levers located on both sides of the loading platform.

4. The stacker crane fall prevention linkage protection device according to claim 3, characterized in that: The safety clamp lever includes: Chain; A chain screw is provided, with the clamp lever suspended at one end of the chain and the other end of the chain connected to the chain screw. The chain screw is fixedly connected to the wire rope lifting assembly located on the same side of the loading platform, which controls the lifting and lowering of the loading platform.

5. The stacker crane fall prevention linkage protection device according to claim 4, characterized in that: The lower connecting plate of the wire rope lifting assembly passes through the side wall of the loading platform, and the lower connecting plate connects the chain and the chain screw of the safety clamp lever.

6. The stacker crane fall prevention linkage protection device according to claim 1 or 5, characterized in that: The wire rope lifting assembly includes: A lifting wedge joint that securely clamps the free end of the wire rope; Rotation axis; A pull rod, wherein the rotating shaft axially connects the lifting wedge joint and the top end of the pull rod; The limiting plate, the middle part of the pull rod is sleeved and clamped to hold two sets of the limiting plates fixed on one side of the loading platform; Spring sleeve; Preload spring; Lower connecting plate; A nut is provided below the limiting plate, on the pull rod, through the spring sleeve, along with the preload spring, the lower connecting plate, and the nut. One end of the preload spring presses against the limiting plate, and the other end of the preload spring presses against the lower connecting plate. The nut is located on the lower connecting plate from bottom to top.

7. The stacker crane anti-fall linkage protection device according to claim 6, characterized in that: The stacker crane anti-fall linkage protection device also includes: Limit switch mounting plate; A limit switch is mounted on the bottom of the limit plate via a limit switch mounting plate. The limit switch abuts against the lower connecting plate and monitors the vertical height change of the lower connecting plate.

8. A stacker crane fall protection method using the stacker crane fall protection device as described in any one of claims 1 to 7, characterized in that: The loading platform is vertically slidably connected between the two side frames of the stacker crane, and the stacker crane anti-fall linkage protection device is connected to one or both sides of the loading platform. The stacker crane anti-fall linkage protection device includes a speed limiter lever fixedly connected to the wire rope and running vertically together with the wire rope. The speed limiter lever is also connected to one side of the loading platform and rises and falls synchronously with the loading platform. When the speed limiter lever rises and falls, it drives the wire rope to rise and fall, and then the wire rope is driven to rotate the speed limiter and the upper pulley. The speed limiter lever is connected and linked to two sets of safety clamp levers located on both sides of the loading platform via a first brake rope and a second brake rope. The speed limiter lever is connected to a set of safety clamp levers located on the left side of the loading platform. The two sets of safety clamp levers located on both sides of the loading platform have the same structure but are positioned opposite each other. When the loading platform loses speed or exceeds speed, the abnormal speed is fed back to the speed limiter lever. The lever rotates clockwise around the axis of the rotating fixed seat. The lever simultaneously pulls the first brake rope and the second brake rope upward, thereby simultaneously controlling the two sets of safety clamps located on both sides of the loading platform. The wedge-shaped blocks of the safety clamps are lifted upward to achieve a clamping and braking action with the guide rail, so that the loading platform can stop in its original position and avoid falling.

9. The stacker crane fall prevention linkage protection method according to claim 8, characterized in that: When any of the steel wire ropes that pull the lifting and lowering of the loading platform breaks, the lower connecting plate of the steel wire rope lifting assembly on that side descends vertically under the combined action of the pull rod and the preload spring. The lower connecting plate is connected to the chain of the safety clamp lever. The descent of the lower connecting plate will pull the clamp lever to rotate clockwise around the rotating fixed seat through the chain. The clamp lever will drive the wedge block of the safety clamp on the same side of the loading platform to rise upward to trigger the rail clamping operation. Simultaneously, the first or second linkage brake rope of the two sets of safety clamp levers located on both sides of the loading platform triggers the other set of safety clamp levers. That is, the safety clamp on the other side rotates clockwise around the rotating fixed seat through the clamp lever, thereby driving the wedge block of the safety clamp to rise upward, thus realizing the synchronous triggering of the two sets of safety clamps to grip the rail.

10. The stacker crane fall prevention linkage protection method according to claim 8, characterized in that: When the loading platform is in normal lifting and lowering operation, the lever is pulled down by the tension spring suspended at the bottom, and the lever is in a horizontal state and will not rotate. The wire rope runs in a closed loop trajectory formed by the speed limiter and the upper pulley. The lifting speed of the wire rope does not exceed the limit value of the speed limiter, the speed limiter will not be triggered, and the entire stacker crane anti-fall linkage protection device is in a non-triggered state.

Images