Anti-falling device of anti-falling casing centralizing table

Abstract

The invention belongs to the technical field of petroleum equipment, and particularly discloses an anti-falling casing centralizing table anti-falling device which comprises a base, a fixed support is fixedly mounted at the end of the base, a sliding support is slidably mounted on the surface of the fixed support, and a sliding wheel frame is arranged at the front end of the top of the sliding support. A sliding wheel mechanism is arranged in the sliding wheel frame and comprises a supporting frame, a sliding wheel assembly and a positioning assembly are arranged at the two ends of the supporting frame respectively, an auxiliary positioning mechanism is arranged at the rear end of the bottom of the sliding support, and an operation table is installed at the front end of the bottom of the sliding support; and a pull-back mechanism is arranged in the operation table. The positioning assembly and the auxiliary positioning mechanism synchronously act through the linkage mechanism, when the accident that a steel wire rope is broken occurs, double locking can be conducted, the safety is greatly improved, meanwhile, when the device is suddenly fixed, the device rapidly moves backwards, protection is formed through cooperation with a protection frame and an elastic net, and personnel are prevented from falling.

Description

Technical Field

[0001] The invention belongs to the technical field of oil equipment, and specifically discloses a fall prevention device for a casing centralizer platform. Background Art

[0002] The casing centralizer platform is an operating platform installed on the main body of the derrick for centralizing the casing and making button connections, and is an essential equipment for the drill rig to conduct tripping operations. Currently, there are various types of casing centralizer platforms. According to the driving method, they are divided into electric, pneumatic, manual, hydraulic and other types; according to the track type, they are divided into single-rail type and multi-rail type. The hydraulic casing centralizer platform has complex structures, generally high manufacturing, use and maintenance costs, is prone to leakage at the connection, and has poor operability, which does not meet the HSE requirements of modern drilling operations. The pneumatic casing centralizer platform is favored by users due to its high cost performance. However, in recent years, some users have reported that the casing centralizer platforms supporting the drill rig sometimes have disadvantages such as inflexible operation, easy jamming, high failure rate of the fall prevention device, and the operating platform affecting the driller's line of sight. Based on the existing single-rail casing centralizer platform, a fall prevention device is designed, which enhances the safety of the equipment and the on-site operability.

[0003] Nowadays, the drill rig system has higher and higher requirements for the convenience of the derrickman's operation and the safety of the equipment used. During the process of running the casing under the casing centralizer platform, when dealing with second-stage and third-stage casings with a length of 10 - 12 meters, it is required that the casing centralizer platform must be equipped with a fall prevention device, which can prevent falling in time in case of special circumstances during the height adjustment process. For example, when the derrickman is adjusting the operating height of the operating platform, if the wire rope breaks or the drum of the winch malfunctions and gets out of control, resulting in the fall of the operating platform, causing casualties and property losses. Therefore, it is very necessary to design a fall prevention device. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a fall prevention device for a casing centralizer platform to solve the problem that when the derrickman is adjusting the operating height of the operating platform in the prior art, the wire rope breaks or the drum of the winch malfunctions and gets out of control, resulting in the fall of the operating platform, causing casualties and property losses.

[0005] To achieve the above purpose, the present invention provides a fall prevention device for a casing centralizer platform, including a base, a fixed bracket is fixedly installed at the end of the base, a sliding bracket is slidably installed on the surface of the fixed bracket, a sliding wheel bracket is arranged at the front end of the top of the sliding bracket, a sliding wheel mechanism is arranged inside the sliding wheel bracket, the sliding wheel mechanism includes a support frame, sliding wheel assemblies and positioning components are respectively arranged at both ends of the support frame, an auxiliary positioning mechanism is arranged at the rear end of the bottom of the sliding bracket, an operating platform is installed at the front end of the bottom of the sliding bracket, and a pulling-back mechanism is arranged inside the operating platform; The sliding bracket is provided with a linkage mechanism on its side. The linkage mechanism is configured to simultaneously drive the positioning component and the auxiliary positioning mechanism to move and engage with the surface of the fixed bracket. The top of the control panel has two side posts at its front end, and the two side posts move on the top of the control panel via the pull-back mechanism.

[0006] In the above technical solution, preferably, a winch is provided on the surface of the base and behind the fixed bracket, a fixed pulley frame is installed on the top of the fixed bracket by bolts, a fixed pulley assembly is provided inside the fixed pulley frame, and a fixed ring is fixedly installed at the front end of the fixed pulley frame.

[0007] In the above technical solution, preferably, the middle end of the support frame is rotatably mounted inside the sliding wheel frame, the positioning component includes a first brake plate, the first brake plate is fixedly mounted on the rear end of the support frame, the sliding wheel frame has a first through groove inside, the surface of the first brake plate mates with the first through groove, the bottom of the front end of the support frame and the bottom of the sliding wheel frame are both provided with fixing holes, a first spring is connected between the two fixing holes, the front end of the support frame has a pulley groove, and the sliding wheel assembly is installed inside the pulley groove.

[0008] In the above technical solution, preferably, the auxiliary positioning mechanism includes an auxiliary frame, a second through groove is provided at the rear end of the bottom of the sliding bracket, the auxiliary frame is disposed outside the second through groove, a movable block is movably installed inside the auxiliary frame, a second brake plate is provided on the surface of the movable block near the fixed bracket, the second brake plate corresponds to the second through groove, and a second spring is connected between the top of the movable block and the sliding bracket.

[0009] In the above technical solution, preferably, the linkage mechanism includes a swing rod, the middle part of which is rotatably mounted on the surface of the sliding bracket via a rotating shaft. An arc-shaped groove is provided on the side of the sliding wheel frame. A first protruding post is fixedly mounted on the side of the support frame, and the surface of the first protruding post moves through the arc-shaped groove. A straight groove is provided on the side of the auxiliary frame. A second protruding post is fixedly mounted on the side of the moving block, and the surface of the second protruding post moves through the straight groove. A connecting frame is fixedly provided at the top of the swing rod. The end of the first protruding post is movably engaged in the connecting frame. The bottom end of the swing rod is located at the front end of the second protruding post.

[0010] In the above technical solution, preferably, the pull-back mechanism includes a first sliding plate, the bottom of the side column is movably disposed inside the operating table, the first sliding plate is fixedly connected between the bottoms of the two side columns, a second sliding plate is slidably installed at the bottom of the operating table, a gear is rotatably installed at the middle of the operating table, the gear is located between the first sliding plate and the second sliding plate, and racks are provided at the bottom of the first sliding plate and the top of the second sliding plate. The first sliding plate meshes with the top of the gear through the rack, and the second sliding plate meshes with the bottom of the gear through the rack.

[0011] In the above technical solution, preferably, two through strips are symmetrically arranged behind the second sliding plate. The through strips movably pass through the operating table. The two through strips are respectively arranged on both sides of the sliding bracket. A first protrusion is fixedly installed at the middle of the top of the through strip. A tension spring is connected between the first protrusion and the operating table. A second protrusion is fixedly installed at the top of the through strip away from the operating table. Bosses are arranged on both sides of the auxiliary frame. A storage groove is opened on the surface of the boss. A micro spring is arranged at the bottom of the storage groove. A positioning block is connected to the top of the micro spring. A positioning post is arranged on the surface of the positioning block. The surface of the positioning post is engaged with the front end of the second protrusion. An inclined surface is arranged on the top of the positioning block. The bottom end of the swing rod cooperates with the inclined surface of the top of the positioning block.

[0012] In the above technical solution, preferably, a protective frame is fixedly installed on the surface of the operating table, the side post is arranged in front of the protective frame, and an elastic net is connected between the protective frame and the side post.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The support frame of the sliding wheel mechanism adopts a lever structure. Under normal conditions, the first brake plate is brought into close contact with the fixed bracket by the first spring to achieve the main braking and prevent the sliding bracket from sliding accidentally. The auxiliary positioning mechanism is brought into contact with the fixed bracket by the second spring to generate friction and form auxiliary braking. The two are linked to move synchronously. When lifting, the brake is released at the same time. When stationary, the double brake is locked, which greatly improves the safety protection capability of the device. The side columns of the operating platform are linked by a pull-back mechanism consisting of gears, sliding plates, etc. When the device is suddenly fixed, the side columns can quickly move backwards to the operating platform, generating a backward thrust on the worker and protecting him inside the protective frame. Together with the protective frame and elastic net, it effectively prevents the worker from falling. The sliding wheel assembly rotates with the support frame to flexibly adapt to changes in wire rope tension, ensuring unobstructed lifting. The linkage mechanism enables the main brake and auxiliary brake to operate synchronously, avoiding mutual interference. The cooperation between the positioning block and the positioning column ensures reliable positioning and reset of the through strip, making the side column move precisely and the overall structure coordinated and efficient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sliding support structure of the present invention; Figure 3 This is a schematic diagram of the sliding wheel mechanism of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A; Figure 5 For the present invention Figure 2 Enlarged view from B; Figure 6 This is a partial cross-sectional view of the sliding bracket of the present invention; Figure 7 This is a schematic diagram of the internal structure of the operating console of the present invention.

[0015] In the diagram: 1. Base; 2. Winch; 3. Operating platform; 4. Fixed bracket; 5. Sliding bracket; 6. Sliding wheel frame; 7. Sliding wheel mechanism; 8. Fixed pulley frame; 9. Fixed pulley assembly; 10. Fixed ring; 11. Support frame; 12. Pulley groove; 13. First brake plate; 14. First through groove; 15. First spring; 16. Auxiliary positioning mechanism; 17. Auxiliary frame; 18. Second through groove; 19. Moving block; 20. Second spring; 21. Second brake plate; 22. Linkage mechanism; 23. Swing rod; 24. Connecting frame; 25. First protrusion; 26. Second protrusion; 27. Pull-back mechanism; 28. Protective frame; 29. ​​Side column; 30. First sliding plate; 31. Gear; 32. Second sliding plate; 33. First protrusion; 34. Through strip; 35. Tension spring; 36. Second protrusion; 37. Positioning block; 38. Positioning column. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0018] like Figures 1-7The anti-fall sleeve straightening platform anti-fall device shown includes a base 1, a fixed bracket 4 fixedly installed at the end of the base 1, a sliding bracket 5 slidably installed on the surface of the fixed bracket 4, a sliding wheel frame 6 provided at the front end of the top of the sliding bracket 5, a sliding wheel mechanism 7 provided inside the sliding wheel frame 6, the sliding wheel mechanism 7 including a support frame 11, a sliding wheel assembly and a positioning assembly respectively provided at both ends of the support frame 11, an auxiliary positioning mechanism 16 provided at the rear end of the bottom of the sliding bracket 5, an operating platform 3 installed at the front end of the bottom of the sliding bracket 5, a pull-back mechanism 27 provided inside the operating platform 3, the base 1 provides a fixed foundation for the entire device, the fixed bracket 4 serves as a sliding rail, the sliding bracket 5 can slide along its surface to realize the lifting and lowering adjustment of the operating platform 3 and related components, the sliding wheel frame 6 at the top of the sliding bracket 5 has a built-in sliding wheel mechanism 7, the support frame 11 has a sliding wheel assembly and a positioning assembly respectively provided at both ends, and the auxiliary positioning mechanism 16 at the rear end of the bottom of the sliding bracket 5 serves as an auxiliary braking component to enhance braking reliability; The sliding bracket 5 is provided with a linkage mechanism 22 on its side. The linkage mechanism 22 is configured to simultaneously drive the positioning component and the auxiliary positioning mechanism 16 to move and engage with the surface of the fixed bracket 4. The linkage mechanism 22 on the side of the sliding bracket 5 is a key coordinating component. It can synchronously drive the positioning component and the auxiliary positioning mechanism 16 to move, so that both engage with the surface of the fixed bracket 4 at the same time, forming a double braking to prevent the sliding bracket 5 from sliding accidentally. The top front end of the control panel 3 is provided with two side posts 29. The two side posts 29 move on the top of the control panel 3 through the pull-back mechanism 27. The control panel 3 serves as a working platform. The two side posts 29 on the top of the control panel 3 are moved through the internal pull-back mechanism 27 to adjust the protection range and enhance operational safety.

[0019] A winch 2 is installed on the surface of the base 1 and behind the fixed support 4. A fixed pulley frame 8 is bolted to the top of the fixed support 4. A fixed pulley assembly 9 is installed inside the fixed pulley frame 8. A fixed ring 10 is fixedly installed at the front end of the fixed pulley frame 8. The wire rope output by the winch 2 sequentially connects to the top end of the fixed pulley assembly 9, the bottom end of the sliding wheel assembly, and finally connects to the fixed ring 10. The winch 2 provides lifting power. The wire rope sequentially passes around the fixed pulley assembly 9 and the sliding wheel assembly, and the end is fixed to the fixed ring 10 to form a closed transmission structure. The sliding support 5 is driven to rise and fall smoothly along the fixed support 4 by the winding and unwinding of the wire rope.

[0020] The middle end of the support frame 11 is rotatably mounted inside the sliding wheel frame 6. The positioning assembly includes a first brake plate 13, which is fixedly mounted at the rear end of the support frame 11. A first through groove 14 is provided inside the sliding wheel frame 6, and the surface of the first brake plate 13 mates with the first through groove 14. Fixing holes are provided at the bottom of the front end of the support frame 11 and the bottom of the sliding wheel frame 6, and a first spring 15 is connected between the two fixing holes. A pulley groove 12 is provided at the front end of the support frame 11, and the sliding wheel assembly is installed inside the pulley groove 12. The support frame 11 is rotatably mounted inside the sliding wheel frame 6 with its middle end as the fulcrum, forming a lever structure. Under normal conditions, the first spring 15 engages the support frame 11 through the fixing holes at both ends. When a pulling force is applied at the front end, the first brake plate 13 at the rear end of the support frame 11 passes through the first through groove 14 and fits tightly with the surface of the fixed bracket 4 to achieve braking positioning. When the sliding wheel assembly is subjected to the tension of the wire rope, the tension is transmitted to the front end of the support frame 11, overcoming the elastic force of the first spring 15, causing the support frame 11 to rotate around the central pivot point. The front end swings upward, and the first brake plate 13 at the rear end separates from the first through groove 14, releasing the brake. The sliding wheel assembly can flexibly adjust its position with the rotation of the support frame 11 to adapt to the changes in the tension of the wire rope. When the tension of the wire rope disappears, the elastic force of the first spring 15 drives the support frame 11 to reset, and the first brake plate 13 re-fits with the first through groove 14 to restore braking positioning.

[0021] The auxiliary positioning mechanism 16 includes an auxiliary frame 17. A second through groove 18 is provided at the rear end of the bottom of the sliding bracket 5. The auxiliary frame 17 is located outside the second through groove 18. A movable block 19 is movably installed inside the auxiliary frame 17. A second brake plate 21 is provided on the surface of the movable block 19 near the fixed bracket 4. The second brake plate 21 corresponds to the second through groove 18. A second spring 20 is connected between the top of the movable block 19 and the sliding bracket 5. The second through groove 18 at the rear end of the bottom of the sliding bracket 5 provides an active channel for the second brake plate 21. The second spring 20 between the top of the movable block 19 and the sliding bracket 5 will apply a continuous elastic force to the movable block 19, causing the movable block 19 to move towards the fixed bracket 4. Under the action of this elastic force, the second brake plate 21 on the surface of the movable block 19 will pass through the second through groove 18, contact the fixed bracket 4 and generate friction, thereby limiting the accidental movement of the sliding bracket 5 relative to the fixed bracket 4 and realizing auxiliary positioning.

[0022] The linkage mechanism 22 includes a swing rod 23, the middle of which is rotatably mounted on the surface of the sliding bracket 5 via a pivot. An arc-shaped groove is formed on the side of the sliding wheel frame 6. A first protruding post 25 is fixedly mounted on the side of the support frame 11, and its surface movably passes through the arc-shaped groove. A straight groove is formed on the side of the auxiliary frame 17. A second protruding post 26 is fixedly mounted on the side of the moving block 19, and its surface movably passes through the straight groove. A connecting frame 24 is fixedly mounted on the top of the swing rod 23. The end of the first protruding post 25 is movably engaged in the connecting frame 24, and the bottom end of the swing rod 23 is positioned at the second protruding post 26. At the front end, when the support frame 11 rotates around the sliding wheel frame 6, the first protruding post 25 on its side will move along an arc-shaped trajectory in the arc-shaped groove of the sliding wheel frame 6, thereby driving the connecting frame 24 at the top of the swing rod 23, so that the swing rod 23 swings around the sliding bracket 5 with the central pivot as the fulcrum. When the swing rod 23 swings, its bottom end will push the second protruding post 26 on the side of the moving block 19. The second protruding post 26 is restricted by the straight groove of the auxiliary frame 17 and can only move in a straight line. Therefore, it drives the moving block 19 to move in a straight line in the auxiliary frame 17, and finally realizes the straight line movement of the moving block 19 and the second brake plate 21 connected to it.

[0023] The pull-back mechanism 27 includes a first sliding plate 30. The bottom of the side posts 29 is movably disposed inside the operating platform 3. The first sliding plate 30 is fixedly connected between the bottoms of the two side posts 29. A second sliding plate 32 is slidably mounted on the bottom of the operating platform 3. A gear 31 is rotatably mounted on the middle of the operating platform 3, positioned between the first sliding plate 30 and the second sliding plate 32. Racks are provided at the bottom of the first sliding plate 30 and the top of the second sliding plate 32. The first sliding plate 30 meshes with the top of the gear 31 through the racks, and the second sliding plate 32 meshes with the bottom of the gear 31 through the racks. The bottom of the side posts 29 is connected to the operating platform 3. The operating platform 3 is connected in a movable manner. The two side posts 29 are linked together by the first sliding plate 30 fixed at the bottom. The gear 31 inside the operating platform 3 serves as an intermediate transmission component, which respectively engages with the rack at the bottom of the first sliding plate 30 and the rack at the top of the second sliding plate 32. When the second sliding plate 32 moves forward inside the operating platform 3, the rack at its top drives the gear 31 to rotate around the axis. When the gear 31 rotates around the axis, it drives the first sliding plate 30 to move in the opposite direction to the movement of the second sliding plate 32 through the rack at the bottom of the first sliding plate 30 that is engaged at the top. As a result, the side posts 29 will move to the rear of the operating platform 3.

[0024] Two through strips 34 are symmetrically arranged behind the second sliding plate 32. These through strips 34 movably pass through the operating table 3. The two through strips 34 are respectively arranged on both sides of the sliding bracket 5. A first protrusion 33 is fixedly installed at the middle of the top of each through strip 34. A tension spring 35 connects the first protrusion 33 to the operating table 3. A second protrusion 36 is fixedly installed at the top of the end of the through strip 34 away from the operating table 3. Bosses are provided on both sides of the auxiliary frame 17. Storage grooves are formed on the surface of the bosses. A micro-spring is installed at the bottom of the storage groove. A positioning block 37 is connected to the top of the micro-spring. A positioning post 38 is provided on the surface of the positioning block 37. The surface of the positioning post 38 is engaged with the front end of the second protrusion 36. An inclined surface is provided on the top of the positioning block 37. The bottom end of the swing rod 23 cooperates with the inclined surface on the top of the positioning block 37. The through strip 34 is fixedly connected to the second sliding plate 32. When the worker pulls the through strip 34 backward (the second sliding plate 32 moves backward in sync), the swing rod 23 moves, pushing the second protrusion 26 backward. When the second protrusion 26 moves backward, its bottom end contacts and presses down on the inclined surface of the top of the positioning block 37, forcing the positioning block 37 to compress the micro spring and move downward. The positioning post 38 will then be engaged behind the second protrusion 36, achieving the positioning engagement of the through strip 34. When the swing rod 23 swings in the opposite direction, the bottom end of the swing rod 23 moves away from the top of the positioning block 37. Under the action of the micro spring, the positioning block 37 and the positioning post 38 will be pushed upward in sync. The positioning post 38 will disengage from the second protrusion 36, releasing the positioning engagement. At this time, the through strip 34 can be reset under the action of the tension spring 35, and the second sliding plate 32 will also move forward in sync.

[0025] A protective frame 28 is fixedly installed on the surface of the operating table 3, and a side post 29 is set in front of the protective frame 28. An elastic net is connected between the protective frame 28 and the side post 29. The protective frame 28 serves as the basic protective structure of the operating table 3 and is fixed to the surface of the operating table 3 to form a rigid frame.

[0026] Working principle: First, the lifting power of the device is provided by the winch 2 on the base 1. The wire rope output by the winch 2 passes sequentially around the fixed pulley assembly 9 in the fixed pulley frame 8 at the top of the fixed support 4, and the sliding wheel assembly of the sliding wheel mechanism 7 in the sliding wheel frame 6, and is finally fixed to the fixed ring 10 at the front end of the fixed pulley frame 8, forming a closed transmission structure. When the winch 2 winds up and unwinds the wire rope, the tension of the wire rope changes direction through the fixed pulley assembly 9, driving the sliding wheel assembly to drive the sliding support 5 to rise and fall smoothly along the surface of the fixed support 4, realizing the height adjustment of the operating platform 3 and related structures. Then, the support frame 11 of the sliding wheel mechanism 7 is a lever structure, with the middle end rotatably installed in the sliding wheel frame 6, the front end connected to the sliding wheel assembly, and the rear end equipped with a first brake plate 13. The front end is connected to the bottom of the sliding wheel frame 6 through a first spring 15. When the rope is pulled, the first spring 15 pulls the front end of the support frame 11, causing the rear first brake plate 13 to pass through the first through groove 14 of the sliding wheel frame 6 and make close contact with the surface of the fixed bracket 4. Braking and positioning are achieved through friction, preventing the sliding bracket 5 from sliding accidentally. When the wire rope pulls the sliding wheel assembly, the pulling force overcomes the elastic force of the first spring 15, causing the support frame 11 to rotate around the central fulcrum, with the front end swinging upwards and the rear end swinging downwards. The first brake plate 13 separates from the fixed bracket 4, releasing the brake. The sliding bracket 5 can then freely rise and fall with the extension and retraction of the wire rope. Next, the moving block 19 inside the auxiliary frame 17 moves towards the fixed bracket 4 through the elastic force of the second spring 20, causing the second brake plate 21 on the surface to pass through the second through groove 18 of the sliding bracket 5 and make close contact with the fixed bracket 4. The contact of bracket 4 generates friction, which helps to limit the accidental movement of sliding bracket 5. The swing rod 23 is mounted on sliding bracket 5 through the central pivot. The top connecting frame 24 is engaged with the first protrusion 25 on the side of support frame 11, and the bottom end cooperates with the second protrusion 26 on the side of moving block 19. When support frame 11 rotates, the first protrusion 25 drives the swing rod 23 to swing, and the bottom end pushes the second protrusion 26, causing moving block 19 to move synchronously. When the main brake is released, the second brake plate 21 of the auxiliary brake also disengages from the fixed bracket 4. When the main brake is reset, the auxiliary brake is also reset synchronously. The two work together to ensure that there is no braking obstruction during lifting and lowering, and double braking lock when stationary, improving safety. Next, the staff will pull the through strip 34 backward (the second sliding plate 32). (Simultaneously moving backward), at the same time, under the action of gear 31, the side post 29 will move to the front of the operating table 3. Then, the swing rod 23 will move, pushing the second protrusion 26 backward. When the second protrusion 26 moves backward, its bottom end will contact and press down on the inclined surface of the top of the positioning block 37, forcing the positioning block 37 to compress the micro spring and move downward. The positioning post 38 will then be locked behind the second protrusion 36, realizing the positioning lock of the through strip 34. When the swing rod 23 swings in the opposite direction, the bottom end of the swing rod 23 will move away from the top of the positioning block 37. Under the action of the micro spring, the positioning block 37 and the positioning post 38 will be pushed upward synchronously. The positioning post 38 will disengage from the second protrusion 36, releasing the positioning lock. At this time, the through strip 34 can be reset under the action of tension spring 35.The second sliding plate 32 also moves forward synchronously. Its top rack drives the gear 31 to rotate around the axis. When the gear 31 rotates around the axis, it drives the first sliding plate 30 to move in the opposite direction to the second sliding plate 32 via the bottom rack of the first sliding plate 30, causing the side post 29 to move backwards from the operating table 3. When the sliding bracket 5 is suddenly fixed, the side post 29 also suddenly moves backwards from the operating table 3, exerting a backward pushing force on the worker, thus protecting the worker within the protective frame 28.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A fall-prevention device for a fall-prevention sleeve straightening platform, comprising a base (1), characterized in that, A fixed bracket (4) is fixedly installed at the end of the base (1). A sliding bracket (5) is slidably installed on the surface of the fixed bracket (4). A sliding wheel frame (6) is provided at the front end of the top of the sliding bracket (5). A sliding wheel mechanism (7) is provided inside the sliding wheel frame (6). The sliding wheel mechanism (7) includes a support frame (11). A sliding wheel assembly and a positioning assembly are respectively provided at both ends of the support frame (11). An auxiliary positioning mechanism (16) is provided at the rear end of the bottom of the sliding bracket (5). An operating table (3) is installed at the front end of the bottom of the sliding bracket (5). A pull-back mechanism (27) is provided inside the operating table (3). The sliding bracket (5) is provided with a linkage mechanism (22) on its side. The linkage mechanism (22) is configured to simultaneously drive the positioning component and the auxiliary positioning mechanism (16) to move and engage with the surface of the fixed bracket (4). The front end of the top of the operating table (3) is provided with two side posts (29), and the two side posts (29) move on the top of the operating table (3) through the pull-back mechanism (27).

2. The anti-fall device for the anti-fall sleeve straightening platform according to claim 1, characterized in that, A winch (2) is provided on the surface of the base (1) and behind the fixed bracket (4). A fixed pulley frame (8) is bolted to the top of the fixed bracket (4). A fixed pulley assembly (9) is provided inside the fixed pulley frame (8). A fixed ring (10) is fixedly installed at the front end of the fixed pulley frame (8).

3. The fall prevention device for the anti-fall sleeve straightening platform according to claim 1, characterized in that, The middle end of the support frame (11) is rotatably mounted inside the sliding wheel frame (6). The positioning component includes a first brake plate (13), which is fixedly mounted at the rear end of the support frame (11). The sliding wheel frame (6) has a first through groove (14) inside. The surface of the first brake plate (13) is in contact with the first through groove (14). The bottom of the front end of the support frame (11) and the bottom of the sliding wheel frame (6) are both provided with fixing holes. A first spring (15) is connected between the two fixing holes. The front end of the support frame (11) has a pulley groove (12), and the sliding wheel assembly is installed inside the pulley groove (12).

4. The anti-fall device for the anti-fall sleeve straightening platform according to claim 3, characterized in that, The auxiliary positioning mechanism (16) includes an auxiliary frame (17). A second through groove (18) is provided at the rear end of the bottom of the sliding bracket (5). The auxiliary frame (17) is located outside the second through groove (18). A movable block (19) is movably installed inside the auxiliary frame (17). A second brake plate (21) is provided on the surface of the movable block (19) near the fixed bracket (4). The second brake plate (21) corresponds to the second through groove (18). A second spring (20) is connected between the top of the movable block (19) and the sliding bracket (5).

5. The anti-fall device for the anti-fall sleeve straightening platform according to claim 4, characterized in that, The linkage mechanism (22) includes a swing rod (23). The middle part of the swing rod (23) is rotatably mounted on the surface of the sliding bracket (5) via a rotating shaft. The side of the sliding wheel frame (6) is provided with an arc-shaped groove. The side of the support frame (11) is fixedly mounted with a first protruding post (25). The surface of the first protruding post (25) moves through the arc-shaped groove. The side of the auxiliary frame (17) is provided with a straight groove. The side of the moving block (19) is fixedly mounted with a second protruding post (26). The surface of the second protruding post (26) moves through the straight groove. The top of the swing rod (23) is fixedly provided with a connecting frame (24). The end of the first protruding post (25) is movably engaged in the connecting frame (24). The bottom end of the swing rod (23) is located at the front end of the second protruding post (26).

6. The fall prevention device for the anti-fall sleeve straightening platform according to claim 5, characterized in that, The pull-back mechanism (27) includes a first sliding plate (30). The bottom of the side column (29) is movably disposed inside the operating table (3). The first sliding plate (30) is fixedly connected between the bottoms of the two side columns (29). A second sliding plate (32) is slidably installed at the bottom of the operating table (3). A gear (31) is rotatably installed at the middle of the operating table (3). The gear (31) is located between the first sliding plate (30) and the second sliding plate (32). A rack is provided at the bottom of the first sliding plate (30) and the top of the second sliding plate (32). The first sliding plate (30) meshes with the top of the gear (31) through the rack, and the second sliding plate (32) meshes with the bottom of the gear (31) through the rack.

7. The fall prevention device for the anti-fall sleeve straightening platform according to claim 6, characterized in that, Two through strips (34) are symmetrically arranged behind the second sliding plate (32). The through strips (34) movably pass through the operating table (3). The two through strips (34) are respectively arranged on both sides of the sliding bracket (5). A first protrusion (33) is fixedly installed at the middle of the top of the through strip (34). A tension spring (35) is connected between the first protrusion (33) and the operating table (3). A second protrusion (36) is fixedly installed at the top of the end of the through strip (34) away from the operating table (3). The auxiliary frame (17) has protrusions on both sides. The surface of the protrusions has a storage groove. The bottom of the storage groove has a miniature spring. The top of the miniature spring is connected to a positioning block (37). The surface of the positioning block (37) has a positioning post (38). The surface of the positioning post (38) is engaged with the front end of the second protrusion (36). The top of the positioning block (37) has an inclined surface. The bottom of the swing rod (23) cooperates with the inclined surface of the top of the positioning block (37).

8. The fall prevention device for the anti-fall sleeve straightening platform according to claim 1, characterized in that, A protective frame (28) is fixedly installed on the surface of the operating table (3), and the side post (29) is located in front of the protective frame (28). An elastic net is connected between the protective frame (28) and the side post (29).

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