An external climbing safety guard for a tower crane

Abstract

The application relates to an external climbing safety protection device for a tower crane, in particular to the tower crane protection technical field, and comprises a lifting device, a climbing frame and a falling prevention device. The synchronous meshing of the two climbing gears and the toothed edge sliding rails is guaranteed through the driving motor and the transmission gear, a double-side meshing lifting point is formed, the traditional single-side meshing is replaced, the lifting stability of the lifting device is improved, the probability of the falling of the lifting device is reduced by increasing the meshing stress points, and the service life of the lifting device is improved. When the lifting device suddenly falls, the blocking of the pawl one and the pawl two to the ratchet one and the ratchet two can interrupt the falling of the lifting device, the two ratchet twos and the ratchet one are distributed in a triangular shape as a whole, a stable triangular falling prevention area is formed, the stress distribution is uniform, and the falling of the lifting device is stably stopped.

Description

Technical Field

[0001] This invention relates to the field of tower crane protection technology, specifically to a safety protection device for the external climbing of tower cranes. Background Technology

[0002] Tower cranes, also known as tower hoists, are rotating cranes with their jibs mounted on the upper part of a tall tower. Tower cranes offer a large working space and are mainly used for the vertical and horizontal transport of materials and the installation of building components in construction. With the development of construction technology, the technical performance requirements for tower cranes are becoming increasingly stringent, especially regarding their safety performance. Traditional tower cranes typically have vertical ladders and climbing mechanisms installed inside the tower for easy access for operators.

[0003] However, current tower climbing machines have the following problems during operation: 1. They use a single-sided lifting gear for meshing and lifting, which not only results in low lifting efficiency, but also fails to effectively prevent falls when the motor stops working unexpectedly or the meshing of the gears malfunctions, resulting in low safety.

[0004] 2. Existing tower climbing machines rely solely on guide rails for lifting and lowering during operation, concentrating all force on one side of the guide rails. This single-side, single-point force distribution further increases the probability of the lifting device falling, thus reducing the overall safety of the tower climbing machine.

[0005] Therefore, in order to solve the problems existing in the operation of the tower crane climbing machine, the present invention provides an external climbing safety protection device for tower cranes. Summary of the Invention

[0006] This invention provides an external climbing safety protection device for tower cranes to solve the problems existing in the operation of tower climbing cranes in related technologies.

[0007] A safety protection device for external climbing of a tower crane includes: a lifting device, a climbing frame, and a fall arrestor. The lifting device is provided with a climbing frame at its rear end, and there are two fall arrestors located on the left and right sides of the lifting device. The climbing frame and the fall arrestor are both fixedly installed within a frame.

[0008] The lifting device includes a housing, a drive motor, and a first transmission gear. The drive motor is fixedly mounted on the inner front wall of the housing. The output shaft of the drive motor is fixedly connected to the first transmission gear, which meshes with a second transmission gear. Both the first and second transmission gears are rotatably mounted at the rear end of the housing. The rear ends of both the first and second transmission gears are fixedly connected to climbing gears located outside the housing. A toothed slide rail is provided between the two climbing gears, and teeth are symmetrically arranged at both ends of the toothed slide rail, corresponding to the climbing gears. The gears mesh, and each of the two climbing gears has an electric telescopic rod fixedly installed at its rear end. The output ends of the two electric telescopic rods are fixedly connected to a ratchet. The outer wall of the rear side of the chassis is fixedly connected to a sliding column and a limit wheel. There are four limit wheels, which are divided into two groups and symmetrically distributed on the left and right sides of the sliding column. The annular surface of the limit wheel rolls in contact with the outer wall of the toothed slide rail. The limit wheels located on the left and right sides of the toothed slide rail and whose centers are on the same horizontal line form a group. The wheel walls of a group of limit wheels are all in rolling connection with the outer wall of the toothed slide rail set between the two wheels.

[0009] The climbing frame includes a ladder and several pawls. The toothed slide rail is fixedly installed in the middle of the front end of the ladder. The ladder is fixedly installed on the inner wall of the rear end of the frame. The pawls are evenly and symmetrically distributed on the left and right sides of the ladder, and the pawls cooperate with the ratchet.

[0010] In one embodiment, the fall arrestor includes an electric telescopic rod II, a ratchet II, a fixed rod, and a pawl II. A platform is fixedly installed at the lower end of the chassis. Two electric telescopic rods II are symmetrically installed on the left and right sides of the platform. The pushing end of each electric telescopic rod II is fixedly connected to a ratchet II. Fixed rods are symmetrically arranged on the left and right sides of the platform. The fixed rods are installed on the inner wall of the frame. Pawl IIs are evenly arranged from top to bottom at the rear end of the fixed rods. The ratchet IIs cooperate with the pawl IIs.

[0011] In one embodiment, there are four guide limiting devices, which are divided into two groups and symmetrically arranged on the left and right sides of the platform. The guide limiting device includes a track column and a guide roller. The upper and lower ends of the track column are fixedly installed on the inner wall of the frame. The guide roller is rotatably installed on one end of the base. The other end of the base is fixedly connected to the side end of the platform. The base is installed on the side end of the machine box. The inner wall of the opposite end of the track column has several slots evenly arranged from top to bottom. The end of the base away from the guide roller has a Z-shaped through groove. Both the front and rear ends of the through groove are open. A locking post is slidably connected in the through groove. The locking post is slidably connected to the front end of the through groove. The size of the spring is smaller than the internal size of the locking groove. A spring is connected between the locking post and the inner wall of the through groove. A connecting plate is provided on the side of the locking post near the platform. The end of the connecting plate away from the locking post is connected to a limiting rod that is slidably connected to the rear end of the through groove. The limiting rod is L-shaped. The horizontal section of the limiting rod is connected to the connecting plate. The vertical section of the limiting rod is located outside the through groove.

[0012] In one embodiment, the slide column includes three sets of ball bearings and a column body. The three sets of ball bearings are rotatably installed at the rear end, left end and right end of the column body, respectively, and the three sets of ball bearings roll in contact with the inner sidewall of the corresponding toothed slide rail. The left and right ends of the base are symmetrically rotatably installed with ball bearings, which roll in contact with the inner wall of the track column.

[0013] In one embodiment, the platform control device includes three telescopic columns and a connecting step. A horizontal plate is installed on the upper end of the vertical section of the limit rod. Four telescopic columns are installed on the side of the horizontal plates that are facing each other. The four telescopic columns are installed on the upper part of the platform, and the surfaces of the telescopic sections of the four telescopic columns abut against the side ends of the horizontal plates. A U-shaped connecting step is connected between the upper ends of the telescopic sections of the four telescopic columns.

[0014] In one embodiment, the lifting linkage device includes a screw rod, a limiting fixing seat, a linkage plate, and a limiting slider. Two limiting fixing seats are symmetrically installed at the top and bottom of the front center of the chassis. The screw rod is rotatably connected between the limiting fixing seats. The linkage plate is threadedly connected to the middle of the screw rod. The rear end of the linkage plate is equipped with a limiting slider. There are two limiting sliders. The rear ends of the two limiting sliders are slidably connected to the front end of the chassis.

[0015] In one embodiment, the waist clamping component includes a right clamping slider, a left clamping slider, and an air cushion. A horizontal groove is provided at the front end of the linkage plate. The left clamping slider and the right clamping slider are installed in the horizontal groove from left to right. A pin sleeve with a plug rod is fixedly installed at the rear end of the right clamping slider, and a cotter pin is fixedly installed at the rear end of the left clamping slider. An air cushion is fixedly installed on the opposite side of the front ends of both the right and left clamping sliders.

[0016] In summary, the present invention has at least one of the following beneficial effects:

[0017] 1. This invention provides an external climbing safety protection device for tower cranes. The drive motor and transmission gear ensure the synchronous meshing of two climbing gears and toothed slide rails, forming a double-sided meshing lifting point, which replaces the traditional single-sided meshing. This not only improves the lifting stability of the lifting device, but also reduces the probability of the lifting device falling by increasing the meshing force points. In addition, it also helps to improve the service life of the lifting device.

[0018] 2. This invention provides an external climbing safety protection device for tower cranes. It utilizes the cooperation of ratchet one and pawl one, and the cooperation of pawl two and ratchet two to increase the fall protection points and improve the fall protection performance. When the lifting device suddenly falls, the blocking of ratchet one and ratchet two by pawl one and ratchet two can interrupt the fall of the lifting device. At the same time, the two ratchet two and ratchet one are arranged in a triangular shape, forming a stable triangular fall protection zone with uniform force distribution, so that the lifting device can stably stop falling.

[0019] 3. This invention provides a safety protection device for the external climbing of a tower crane. When the lifting device suddenly falls during its descent, the worker standing on the platform immediately steps down on the connecting pedal. The connecting pedal causes the four telescopic columns to retract synchronously. After the three telescopic sections of the telescopic columns separate from the horizontal plate, the horizontal plate, limit rod, connecting plate, and locking column as a whole move under the rebound force of the spring. The locking column inserts into the locking slot. At this time, due to the obstruction of the locking slot, the lifting device stops falling. Furthermore, the even distribution of the locking columns ensures that the platform and the lifting device as a whole are subjected to uniform force, thereby stably stopping the fall of the lifting device.

[0020] 4. This invention provides an external climbing safety protection device for tower cranes, which uses the cooperation between guide rollers and track columns to guide and limit the lifting of the lifting device, increase the overall force balance of the lifting device, make it stable in lifting, and also facilitate the stable interruption of the lifting device's descent.

[0021] 5. This invention provides an external climbing safety protection device for tower cranes. When a worker stands on the platform, the vertical distance can be adjusted by regulating the spacing of the left and right clamping blocks and the screw rod of the linkage plate to effectively secure the worker's waist, protecting and securing the worker and preventing instability when the lifting device moves. The air cushions on the clamping blocks improve the comfort of the worker's waist clamping and provide elastic cushioning protection.

[0022] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the embodiments of this application based on an external climbing safety protection device for tower cranes, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a front-view stereoscopic structural diagram of the present invention.

[0025] Figure 2 This is a partial three-dimensional structural diagram of the lifting device of the present invention.

[0026] Figure 3 This is a partial planar structural diagram of the lifting device of the present invention.

[0027] Figure 4 This is a top-view cross-sectional structural diagram of the lifting device of the present invention.

[0028] Figure 5 This is a schematic diagram of the rear view of the lifting device of the present invention.

[0029] Figure 6 This is a top-view cross-sectional structural diagram of the sliding column of the present invention.

[0030] Figure 7 This is a three-dimensional structural diagram of the platform control device, lifting linkage device, and waist clamping component of the present invention.

[0031] Figure 8 This is a side view of the lifting linkage device of the present invention.

[0032] Figure 9 This is a top-view cross-sectional structural diagram of the guiding device of the present invention.

[0033] Figure 10 This is a top view of the structure of the present invention.

[0034] Figure 11 For the present invention Figure 7 A magnified view of a portion of region A in the middle.

[0035] Reference numerals: 1. Lifting device; 11. Chassis; 12. Drive motor; 13. Transmission gear one; 14. Transmission gear two; 15. Climbing gear; 16. Electric telescopic rod one; 17. Ratchet one; 18. Sliding column; 181. Ball bearing one; 182. Column; 19. Limiting wheel; 2. Climbing frame; 21. Climbing ladder; 22. Toothed slide rail; 23. Pawl one; 3. Fall protection device; 31. Electric telescopic rod two; 32. Ratchet two; 33. Fixed rod; 34. Pawl two; 4. Guide limiting device; 41 411. Track column; 42. Slot; 42. Guide roller; 421. Ball bearing 2; 422. Spring; 423. Locking column; 424. Limiting rod; 5. Platform control device; 51. Platform; 52. Telescopic column 3; 53. Connecting pedal; 6. Lifting linkage device; 61. Helical rod; 62. Limiting fixing seat; 63. Linkage plate; 64. Limiting slider; 7. Waist clamping component; 71. Right clamping slider; 711. Pin sleeve; 72. Left clamping slider; 721. Cotter pin; 73. Air cushion; 8. Frame. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Please see Figure 1 A safety protection device for external climbing of a tower crane includes: a lifting device 1, a climbing frame 2, and a fall arrestor 3. The lifting device 1 is provided with a climbing frame 2 at its rear end. There are two fall arrestors 3 located on the left and right sides of the lifting device 1. The climbing frame 2 and the fall arrestor 3 are both fixedly installed in a frame 8.

[0038] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 ,and Figure 7The lifting device 1 includes a housing 11, a drive motor 12, and a transmission gear 13. The drive motor 12 is fixedly installed on the inner front wall of the housing 11. The output shaft of the drive motor 12 is fixedly connected to the transmission gear 13, which meshes with a transmission gear 14. Both the transmission gear 13 and the transmission gear 14 are rotatably installed at the rear end of the housing 11. The rear ends of both the transmission gear 13 and the transmission gear 14 are fixedly connected to climbing gears 15 located outside the housing 11. A toothed slide rail 22 is provided between the two climbing gears 15. Teeth are symmetrically arranged at both ends of the toothed slide rail 22, and the teeth mesh with the corresponding climbing gears 15. Electric telescopic rods 16 are fixedly installed at the rear ends of both climbing gears 15. Ratchets are fixedly connected to the pushing ends of both electric telescopic rods 16. 17. A sliding column 18 and a limiting wheel 19 are fixedly connected to the outer wall of the rear side of the chassis 11. The sliding column 18 includes three sets of ball bearings 181 and a column 182. The three sets of ball bearings 181 are rotatably installed at the rear end, left end and right end of the column 182, respectively. The three sets of ball bearings 181 roll in contact with the inner wall of the corresponding toothed slide rail 22. There are four limiting wheels 19, which are evenly divided into two groups and symmetrically distributed on the left and right sides of the sliding column 18. The annular surface of the limiting wheel 19 rolls in contact with the outer wall of the toothed slide rail 22. The climbing gears 15 meshing on the left and right sides of the toothed slide rail 22 form a double-sided meshing lifting point, which replaces the traditional single-sided meshing. This not only helps to improve the lifting stability of the lifting device 1, but also reduces the probability of the lifting device 1 falling by increasing the meshing force points. In addition, it also helps to improve the service life of the lifting device 1.

[0039] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 ,and Figure 7 The climbing frame 2 includes a ladder 21 and several pawls 23. A toothed slide rail 22 is fixedly installed in the middle of the front end of the ladder 21. The ladder 21 is fixedly installed on the inner wall of the rear end of the frame 8. The pawls 23 are evenly and symmetrically distributed on the left and right sides of the ladder 21 and cooperate with the ratchet 17. During the lifting device 1's ascent, the ratchet 17 rises synchronously. The pawls 23 are pushed upward by the downward force of the ratchet 17 and rotate upward. The pawls 23 can only rotate upward in one direction. When the lifting device 1 moves downward, the ratchet 17 is pushed backward by the pushing end of the electric telescopic rod 16 to disengage the ratchet 17 from the pawls 23, so as to avoid the cooperation between the ratchet 17 and the pawls 23 from hindering the descent of the lifting device 1.

[0040] Please see Figure 7 , Figure 8 and Figure 10The fall arrestor 3 includes an electric telescopic rod 31, a ratchet 32, a fixed rod 33, and a pawl 34. A platform 51 is fixedly installed at the lower end of the housing 11. Two electric telescopic rods 31 are symmetrically installed on the left and right sides of the platform 51. The pushing end of each electric telescopic rod 31 is fixedly connected to a ratchet 32. Fixed rods 33 are symmetrically arranged on the left and right sides of the platform 51 and are installed on the inner wall of the frame 8. Pawls 34 are evenly arranged from top to bottom at the rear end of each fixed rod 33, and the ratchet 32 ​​and pawl 34 cooperate with each other. When the drive motor 12 suddenly stops working or the meshing between the teeth of the climbing gear 15 and the toothed slide rail 22 fails, causing the lifting device 1 to suddenly fall during its ascent, pawl 24 and pawl 23 will respectively block ratchet 22 and ratchet 17, preventing them from moving further downward and thus interrupting the descent of the lifting device 1. The two ratchet wheels 22 and 17 are arranged in a triangular pattern, forming a stable triangular anti-fall zone with even force distribution, ensuring the lifting device 1 stops falling stably. When the lifting device 1 completes its ascent and is about to move downward, the electric telescopic rod 231 moves ratchet 22 away from pawl 24, preventing the engagement between ratchet 22 and pawl 34 from hindering the descent of the lifting device 1.

[0041] Please see Figure 1 , Figure 9 and Figure 10 The guide limiting device 4 has four units, which are divided into two groups and symmetrically arranged on the left and right sides of the platform 51. The guide limiting device 4 includes a track column 41 and a guide roller 42. The upper and lower ends of the track column 41 are fixedly installed on the inner wall of the frame 8. The guide roller 42 is rotatably installed on one end of the base. The other end of the base is fixedly connected to the side end of the platform 51. The base is installed on the side end of the housing 11. The inner side wall of the track column 41 that is opposite to the front and rear ends is provided with several slots 411 evenly arranged from top to bottom. The left and right ends of the base are symmetrically rotatably installed with ball bearings 421. The ball bearings 421 roll in contact with the inner wall of the track column 41.

[0042] Please see Figure 1 , Figure 7 and Figure 9A Z-shaped through groove is provided at the end of the base away from the guide roller 42. Both ends of the through groove are open. A locking post 423 is slidably connected inside the through groove. The locking post 423 is slidably connected to the front end of the through groove, and the size of the spring 422 is smaller than the internal size of the locking groove 411. The spring 422 is connected between the locking post 423 and the inner wall of the through groove. A connecting plate is provided on the side of the locking post 423 near the platform 51. A limiting rod 424 is slidably connected to the rear end of the through groove at the end of the connecting plate away from the locking post 423. The limiting rod 424 is L-shaped, and the horizontal section of the limiting rod 424 is connected to the connecting plate, while the vertical section of the limiting rod 424 is located outside the through groove. During the up and down movement of the lifting device 1, the guide roller 42 moves up and down synchronously along the track column 41. The cooperation between the guide roller 42 and the track column 41 provides guidance and limitation for the lifting device 1, increases the overall force balance of the lifting device 1, makes it stable in lifting and lowering, and also helps to stably stop the descent of the lifting device 1.

[0043] Please see Figure 1 and Figure 7 The platform control device 5 includes telescopic columns 52 and connecting steps 53. A horizontal plate is installed on the upper end of the vertical section of the limiting rod 424. Telescopic columns 52 are arranged on the side of the horizontal plates that are close to each other. There are four telescopic columns 52, which are installed on the upper end of the platform 51. The surfaces of the telescopic sections of the four telescopic columns 52 abut against the side ends of the horizontal plates. The upper ends of the telescopic sections of the four telescopic columns 52 are connected by a U-shaped connecting step 53. In the initial state, the surfaces of the telescopic sections of the four telescopic columns 52 abut against the side ends of the horizontal plates. At this time, the spring 422 is in a contracted state. When the lifting device 1 suddenly drops during the downward movement... At that moment, the staff standing on platform 51 immediately stepped down on the connecting pedal 53. The connecting pedal 53 caused the four telescopic columns 52 to retract synchronously. After the telescopic sections of the telescopic columns 52 separated from the horizontal plate, the horizontal plate, the limit rod 424, the connecting plate, and the locking column 423 moved under the rebound force of the spring 422. Before the locking column 423 was aligned with the locking groove 411, the locking column 423 moved along the inner wall of the track column 41. At this time, the spring 422 was still in the contracted state. When the locking column 423 was aligned with the locking groove 411, it was inserted into the locking groove 411 under the combined action of the spring 422 and the locking column 423. At this time, due to the obstruction of the locking groove 411, the lifting device 1 stopped falling. The even distribution of the locking columns 423 made the platform 51 and the lifting device 1 uniformly stressed, thus making the lifting device 1 stably stop falling.

[0044] Please see Figure 7 and Figure 8The lifting linkage device 6 includes a screw rod 61, a limiting fixing seat 62, a linkage plate 63, and a limiting slider 64. Two limiting fixing seats 62 are symmetrically installed at the middle of the front end of the housing 11. The screw rod 61 is rotatably connected between the limiting fixing seats 62. The linkage plate 63 is threadedly connected to the middle of the screw rod 61. The limiting slider 64 is installed at the rear end of the linkage plate 63. There are two limiting sliders 64. The rear ends of the two limiting sliders 64 are slidably connected to the front end of the housing 11.

[0045] Please see Figure 7 , Figure 8 , Figure 10 and Figure 11 The waist clamping component 7 includes a right clamping slider 71, a left clamping slider 72, and an air cushion 73. A horizontal groove is provided at the front end of the linkage plate 63. The left clamping slider 72 and the right clamping slider 71 are installed sequentially from left to right within the horizontal groove. A pin sleeve 711 with a insert rod is fixedly installed at the rear end of the right clamping slider 71, and a cotter pin 721 is fixedly installed at the rear end of the left clamping slider 72. Air cushions 73 are fixedly installed on opposite sides of the front ends of both the right and left clamping sliders 71 and 72. The worker stands on the platform 51 and adjusts their position to be between the right and left clamping sliders 71 and 72. Then, according to their waist height, they rotate the screw rod 61, causing the linkage plate 63 to... The right clamping slider 71 and the left clamping slider 72 move down or up synchronously until the air cushion 73 is level with the waist. Then, the right clamping slider 71 and the left clamping slider 72 move in opposite directions until the air cushion 73 is close to the waist. At this time, the cotter pin 721 is inserted into the pin sleeve 711, and then the insert rod is inserted into the opening in the cotter pin 721, thereby achieving the effect of fixing the right clamping slider 71 and the left clamping slider 72. The right clamping slider 71, the left clamping slider 72 and the air cushion 73 work together to protect and fix the worker, preventing the worker from being unstable when the lifting device 1 moves. The air cushion 73 improves the comfort of the worker's waist clamping and provides elastic cushioning protection for the waist.

[0046] The working principle of this invention is as follows: (1) The staff member stands on the upper end of the platform 51 and adjusts the position so that it is between the right clamping slider 71 and the left clamping slider 72. Then, according to the height of the waist, the staff member rotates the screw rod 61 so that the linkage plate 63 drives the clamping slider 71 and the left clamping slider 72 to move down or up synchronously until the air cushion 73 is level with the waist. Then the right clamping slider 71 and the left clamping slider 72 move towards each other until the air cushion 73 is close to the waist. At this time, the cotter pin 721 is inserted into the pin sleeve 711, and then the insert rod is inserted into the opening in the cotter pin 721, thereby fixing the right clamping slider 71 and the left clamping slider 72.

[0047] (2) Start the lifting device 1. Drive the motor 12 to drive the transmission gear 13 and the transmission gear 2 14 that meshes with the transmission gear 13 to rotate synchronously. The two climbing gears 15 rotate synchronously under the drive of the transmission gear 13 and the transmission gear 2 14 respectively. The climbing gear 15 and the teeth of the side end of the toothed slide rail 22 mesh to realize the rise of the platform 51.

[0048] (3) When the platform 51 suddenly falls during the ascent, the second pawl 34 set on the fixed rod 33 and the first pawl 23 set on both sides of the ladder 21 will block the second ratchet 32 ​​and the first ratchet 17 respectively, so that the second ratchet 32 ​​and the first ratchet 17 cannot continue to move downward, thereby interrupting the fall of the lifting device 1. The two second ratchet 32 ​​and the first ratchet 17 are arranged in a triangular shape, forming a stable triangular anti-fall zone with uniform force distribution, so that the lifting device 1 stops falling stably.

[0049] (4) Before the platform 51 moves downward, the electric telescopic rod 16 pushes the ratchet 17 backward, causing the ratchet 17 and pawl 23 to be misaligned. Simultaneously, the electric telescopic rod 31 moves the ratchet 32 ​​away from the pawl 34, preventing the ratchet 17 and pawl 23, and the ratchet 32 ​​and pawl 34 from obstructing the downward movement of the lifting device 1, thus allowing the lifting device 1 to move smoothly downward. During the descent, the guide roller 42 moves synchronously up and down along the track column 41. The cooperation between the guide roller 42 and the track column 41 provides guidance and limits for the lifting of the lifting device 1, increasing the overall force balance of the lifting device 1.

[0050] (5) When the lifting device 1 suddenly falls during the downward movement, the staff standing on the platform 51 immediately step down on the connecting pedal 53. The connecting pedal 53 causes the four telescopic columns 3 52 to retract synchronously. After the telescopic section of the telescopic column 3 52 separates from the horizontal plate, the horizontal plate, the limit rod 424, the connecting plate and the locking column 423 move together under the action of the spring 422. Before the locking column 423 is aligned with the locking groove 411, the locking column 423 moves along the inner wall of the track column 41. At this time, the spring 422 is still in the contracted state. When the locking column 423 is aligned with the locking groove 411, it is inserted into the locking groove 411 under the combined action of the spring 422 and the locking column 423. At this time, the lifting device 1 stops falling due to the obstruction of the locking groove 411.

[0051] In the description of this invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A safety protection device for the external climbing of a tower crane, characterized in that, include: A lifting device (1) and a climbing frame (2) are provided at the rear end of the lifting device (1). There are two fall arrestors (3) located on the left and right sides of the lifting device (1). The climbing frame (2) and the fall arrestors (3) are both fixedly installed inside the frame (8). The lifting device (1) includes a housing (11), a drive motor (12), a first transmission gear (13), and a second transmission gear (14). The drive motor (12) is fixedly installed on the inner wall of the front end of the housing (11). The output shaft of the drive motor (12) is fixedly connected to the first transmission gear (13). The first transmission gear (13) meshes with the second transmission gear (14). The first transmission gear (13) and the second transmission gear (14) are both rotatably installed at the rear end of the housing (11). The rear ends of the first transmission gear (13) and the second transmission gear (14) are both fixedly connected to climbing gears (15) located outside the housing 11. A toothed slide rail (22) is provided between the two climbing gears (15). The left and right ends of the toothed slide rail (22) are symmetrical. The gears are provided with teeth that mesh with the corresponding climbing gears (15). The rear ends of the two climbing gears (15) are fixedly installed with electric telescopic rods (16). The output ends of the two electric telescopic rods (16) are fixedly connected with ratchet (17). The outer wall of the rear side of the chassis (11) is fixedly connected with a sliding column (18) and a limiting wheel (19). There are four limiting wheels (19), which are divided into two groups and symmetrically distributed on the left and right sides of the sliding column 18. The annular surface of the limiting wheel 19 rolls in contact with the outer wall of the toothed slide rail 22. The limiting wheels (19) located on the left and right sides of the toothed slide rail (22) and whose centers are on the same horizontal line are in a group. The wheel walls of a group of limiting wheels (19) are all rolled in contact with the outer wall of the toothed slide rail (22) between the two wheels. The climbing frame (2) includes a climbing ladder (21) and several pawls (23). The toothed slide rail (22) is fixedly installed in the middle of the front end of the climbing ladder 21. The climbing ladder 21 is fixedly installed on the inner wall of the rear end of the frame 8. The pawls (23) are evenly and symmetrically distributed on the left and right sides of the climbing ladder (21), and the pawls (23) cooperate with the ratchet (17). It also includes a fall protection device (3), which includes an electric telescopic rod (31), a ratchet (32), a fixed rod (33) and a pawl (34). A platform (51) is fixedly installed at the lower end of the machine box (11). There are two electric telescopic rods (31) installed symmetrically on the left and right sides of the platform (51). The pushing end of each electric telescopic rod (31) is fixedly connected to a ratchet (32). Fixed rods (33) are symmetrically arranged on the left and right sides of the platform (51). The fixed rods (33) are installed on the inner wall of the frame (8). Pawls (34) are evenly arranged from top to bottom at the rear end of the fixed rods (33). The ratchet (32) and the pawl (34) cooperate with each other. It also includes a guide limiting device (4), which includes a track column (41) and a guide roller (42). The guide roller (42) is rotatably installed at one end of the base. A Z-shaped through groove is opened at the end of the base away from the guide roller (42). Both the front and rear ends of the through groove are open. A locking post (423) is slidably connected in the through groove. A connecting plate is provided on the side of the locking post (423) near the platform (51). A limiting rod (424) is slidably connected to the rear end of the through groove at the end of the connecting plate away from the locking post (423). It also includes a platform control device (5), which includes telescopic columns (52) and connecting pedals (53). A horizontal plate is installed on the upper end of the vertical section of the limiting rod (424). A telescopic column (52) is provided on the side of the horizontal plate that is close to the front and rear. There are four telescopic columns (52). The four telescopic columns (52) are installed on the upper end of the platform (51), and the surface of the telescopic section of the four telescopic columns (52) abuts against the side end of the horizontal plate. The upper ends of the telescopic sections of the four telescopic columns (52) are connected together by a U-shaped connecting pedal (53). The sliding column (18) includes three sets of ball bearings (181) and a column (182). The three sets of ball bearings (181) are rotatably installed at the rear end, left end and right end of the column (182) respectively, and the three sets of ball bearings (181) roll in contact with the inner wall of the corresponding toothed slide rail (22). The platform (51) located below the machine box (11) has bases for guide rollers (42) fixedly installed on the left and right sides. The left and right ends of the base are symmetrically rotatably installed with ball bearings (421), and the ball bearings (421) roll in contact with the inner wall of the track column (41). It also includes a lifting linkage device (6), which includes a screw rod (61), a limiting fixing seat (62), a linkage plate (63), and a limiting slider (64). Two limiting fixing seats (62) are symmetrically installed at the middle of the front end of the housing (11). The screw rod (61) is rotatably connected between the limiting fixing seats (62). The linkage plate (63) is threadedly connected to the middle of the screw rod (61). It also includes a waist clamping component (7), which includes a right clamping slider. (71) The left clamping slider (72) and the air cushion (73) are connected to the horizontal groove at the front end of the linkage plate (63). The left clamping slider (72) and the right clamping slider (71) are installed in the horizontal groove from left to right. The rear end of the right clamping slider (71) is fixedly installed with a pin sleeve (711) with a plug rod. The rear end of the left clamping slider (72) is fixedly installed with a cotter pin (721). The front ends of the right clamping slider (71) and the left clamping slider (72) are both fixedly installed with air cushions (73) on opposite sides.

2. The external climbing safety protection device for a tower crane according to claim 1, characterized in that: The guide limiting device (4) has four units, which are divided into two groups and symmetrically arranged on the left and right sides of the platform (51). The upper and lower ends of the track column (41) are fixedly installed on the inner wall of the frame (8). The other end of the base is fixedly connected to the side end of the platform (51). The base is installed on the side end of the machine box (11). The inner side wall of the track column (41) that is far away from each other is provided with several slots (411) evenly arranged from top to bottom. The slot (423) is slidably connected to the front end of the through slot. A spring (422) is connected between the slot (423) and the inner wall of the through slot. The size of the spring (422) is smaller than the internal size of the slot (411). The limiting rod (424) is L-shaped. The horizontal section of the limiting rod (424) is connected to the connecting plate. The vertical section of the limiting rod (424) is located outside the through slot.

3. The external climbing safety protection device for a tower crane according to claim 1, characterized in that: The linkage plate (63) has a limit slider (64) installed at the rear end. There are two limit sliders (64), and the rear ends of the two limit sliders (64) are slidably connected to the front end of the chassis (11).

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