A safety lifting device for railway construction and its use method

Abstract

The present invention discloses a safety lifting device for railway construction and a method for using the same, comprising a safety lifting device body, a fixed plate, a side block structure, and a telescopic rod, wherein the fixed plate is arranged at the bottom of the outer side of the safety lifting device body, the interior of the fixed plate is provided with a mounting groove, a first biaxial telescopic rod is fixedly installed in the mounting groove, and the output end of the first biaxial telescopic rod is fixedly installed on the front and back sides of the fixed plate with a clamping plate; the side block structure is arranged on both sides of the fixed plate, the side block structure includes a side block, the front and back sides of the inner side of the side block are provided with a first sliding groove, the telescopic rod is fixedly installed on the front and back sides of the top of the side block through a connecting plate, and the output end of the telescopic rod is fixedly installed on the top of the fixed plate. The present invention can be adjusted according to the actual length, width, and thickness of the material, and its material is clamped and fixed and the lifting work is performed, and the operation steps are simple and convenient.

Description

Technical Field

[0001] The present invention relates to the field of railway construction, and in particular to a safety lifting device for railway construction and a method of using the same. Background Art

[0002] Railway construction refers to various civil engineering facilities on the railway, and also refers to the technologies used in various stages of railway construction. Railway engineering originally included civil, mechanical and signal engineering related to the railway.

[0003] During railway construction, safety lifting devices are required to transport large and heavy materials such as rails.

[0004] Most of the existing safety lifting devices use cranes to lift materials for railway construction. During the lifting process, the materials need to be tied with steel ropes. However, in order to tie them firmly, the operation steps are cumbersome and complicated, and they cannot be tied quickly and effectively when using safety lifting devices for lifting, thereby reducing work efficiency.

[0005] Therefore, it is necessary to provide a safety lifting device for railway construction and a method of using the same to solve the above technical problems. Summary of the Invention

[0006] The object of the present invention is to provide a safe lifting device for railway construction and a method of using the same, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A safety lifting device for railway construction, comprising a safety lifting device body, a fixing plate, a side stop structure and a telescopic rod, wherein:

[0008] A fixing plate is provided at the bottom of the outer side of the main body of the safety lifting device, and a mounting groove is provided inside the fixing plate. A first biaxial telescopic rod is fixedly installed inside the mounting groove, and clamping plates are fixedly installed at the output ends of the first biaxial telescopic rod and on the front and back sides of the fixing plate;

[0009] A side stop structure is provided on both sides of the fixed plate, the side stop structure comprising a side stop plate, a first slide groove is provided on the front and back sides of the inner side of the side stop plate, a first slider is slidably connected to the interior of the first slide groove, a second biaxial telescopic rod is fixedly installed on the inner side of the first slider, and a fixed end of the second biaxial telescopic rod is fixedly installed to the top of the fixed plate;

[0010] The telescopic rod is fixedly mounted on the front and back sides of the top of the side baffle through a connecting plate, and the output end of the telescopic rod is fixedly mounted on the top of the fixing plate.

[0011] Preferably, a hanging ring is fixedly installed on the top of the fixing plate.

[0012] Preferably, a receiving cavity is provided on both sides of the interior of the fixing plate, and an extension column is provided on both sides of the interior of the receiving cavity, and the outer sides of the extension columns are fixedly connected to the inner side of the clamping plate.

[0013] Preferably, a groove is provided at the bottom of the inner side of the splint.

[0014] Preferably, baffles are fixedly mounted on the front and back sides of the bottom of the side baffle.

[0015] Preferably, first through holes are provided on the front and back sides of the interior of the fixing plate, a moving rod is provided inside the first through hole, and a connecting plate is fixedly installed on the top of the moving rod.

[0016] Preferably, an arc-shaped clamp is rotatably provided at the bottom of the movable rod, an outer side of the arc-shaped clamp is rotatably connected to a connecting block, and a top of the connecting block is rotatably connected to a connecting column.

[0017] Preferably, the top of the connecting column is rotatably connected to the outer side of the bottom of the fixing plate, and installation cavities are provided on the front and back sides of the interior of the fixing plate, and an insertion rod is provided inside the installation cavity.

[0018] Preferably, a tension spring is provided on the surface of the insertion rod and located outside the fixing plate, and a card slot is provided on the surface of the movable rod.

[0019] The present invention also provides a method for using the above-mentioned safety lifting device for railway construction, comprising the following steps:

[0020] Step 1: hoisting the fixing plate to the top of the railway construction material to be hoisted by the main body of the safety lifting device;

[0021] Step 2: Activate the first biaxial telescopic rod to push the splint outward until the distance between the two splints is greater than the length of the material;

[0022] Step 3: activating the side baffle structure to expand the distance between the two side baffles, and driving the baffle to move while the side baffle moves until the distance between the two baffles is greater than the width of the material;

[0023] Step 4: Then, by using the main body of the safety lifting device, the fixing plate is loosened and moved downward until the baffle contacts the ground. At this time, the telescopic rod can be activated to change the height between the fixing plate and the ground by extending or retracting the telescopic rod until it reaches a height that is approximately the same as the thickness of the material stack;

[0024] Step 5: Start the second double-axis telescopic rod to drive the side baffles on both sides to move, narrowing the distance between them and driving the baffles to move. Since the baffles are in contact with the ground, the materials to be hoisted are clamped at the bottom of the fixed plate. At the same time, start the first double-axis telescopic rod to drive the clamping plate to move, narrowing the distance between the two clamping plates, so that the materials can be clamped and fixed in other directions. Then, start the telescopic rod and retract the telescopic rod to drive the side baffles and the baffles to move upward, thereby changing the distance between the baffles and the fixed plate, so that the materials can be clamped and fixed in multiple directions. Then, the lifting and hoisting work can be performed by using the main body of the safety lifting device.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention can adjust the length, width and thickness of the material according to the actual material through the mutual cooperation between the safety lifting device body, the fixing plate, the installation groove, the first biaxial telescopic rod, the clamping plate, the second biaxial telescopic rod, the first sliding groove, the first sliding block, the side baffle, the telescopic rod and other structures. The material is clamped and fixed and the lifting work is performed. The operation steps are simple and convenient, so that the material can be clamped and fixed and the lifting work can be performed quickly and effectively, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of Example 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the three-dimensional structure of the outer side of the fixed plate in Example 1;

[0029] Figure 3 This is a schematic structural diagram of the bottom of the fixed plate in Example 1;

[0030] Figure 4 Schematic diagram of the top cross-section of the fixing plate in Example 1;

[0031] Figure 5 This is a structural diagram of Embodiment 2 of the present invention;

[0032] Figure 6 This is a schematic structural diagram of the top of the first through hole in Example 2;

[0033] Figure 7 This is a structural diagram of Example 3 of the present invention.

[0034] In the figure: 1. Safety lifting device body; 2. Fixed plate; 3. Mounting groove; 4. First biaxial telescopic rod; 5. Clamp; 6. Storage cavity; 7. Extension column; 8. Side block structure; 81. Second biaxial telescopic rod; 82. First slide groove; 83. First slider; 84. Side baffle; 9. Telescopic rod; 10. Hanging ring; 11. Baffle; 12. Groove; 13. First through hole; 14. Moving rod; 15. Connecting plate; 16. Arc clamp; 17. Connecting block; 18. Connecting column; 19. Mounting cavity; 20. Insert rod; 21. Tension spring; 22. Card slot; 23. Second slide groove; 24. Third biaxial telescopic rod; 25. Second slider; 26. Linking rod; 27. Pull plate; 28. Second through hole; 29. ​​Wire rope. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Example 1: Please refer to Figure 1-4 The present invention provides a technical solution: a safety lifting device for railway construction, comprising: a safety lifting device body 1, a fixing plate 2, a side block structure 8 and a telescopic rod 9, wherein:

[0039] A fixing plate 2 is provided at the bottom of the outer side of the main body 1 of the safety lifting device. A mounting groove 3 is provided inside the fixing plate 2. A first biaxial telescopic rod 4 is fixedly installed inside the mounting groove 3. Clamping plates 5 are fixedly installed at the output ends of the first biaxial telescopic rod 4 and on the front and back sides of the fixing plate 2.

[0040] A side baffle structure 8 is provided on both sides of the fixed plate 2. The side baffle structure 8 includes a side baffle 84. A first slide groove 82 is provided on the front and back sides of the inner side of the side baffle 84. A first slider 83 is slidably connected to the interior of the first slide groove 82. A second biaxial telescopic rod 81 is fixedly installed on the inner side of the first slider 83. The fixed end of the second biaxial telescopic rod 81 is fixedly installed to the top of the fixed plate 2.

[0041] The telescopic rod 9 is fixedly mounted on the front and back sides of the top of the side baffle 84 through a telescopic connecting plate, and the output end of the telescopic rod 9 is fixedly mounted on the top of the fixing plate 2 .

[0042] In this embodiment, the telescopic connecting plate can change with the change of the distance between the side baffles 84 and the fixed plate 2 on both sides thereof, so as not to affect the movement of the side baffles 84, and at the same time can drive the side baffles 84 to move by extending or retracting the telescopic rod 9.

[0043] In this embodiment, a hanging ring 10 is fixedly installed on the top of the fixing plate 2 .

[0044] In this embodiment, the hanging ring 10 is used to facilitate the hook in the main body 1 of the safety lifting device to be hung inside the main body 1 so as to perform the lifting work on the fixing plate 2 therein.

[0045] In this embodiment, a receiving cavity 6 is provided on both sides of the interior of the fixing plate 2 , and an extension column 7 is provided on both sides of the interior of the receiving cavity 6 . The outer sides of the extension columns 7 are fixedly connected to the inner side of the clamping plate 5 .

[0046] In this embodiment, the bottom of the inner side of the clamping plate 5 is provided with a groove 12. By using the groove 12, when the clamping plate 5 clamps and fixes the material, the material can be inserted into the inside of the groove 12 so that the material can be positionally restricted.

[0047] Baffles 11 are fixedly mounted on the front and back sides of the bottom of the side baffle 84 .

[0048] The baffle 11 can support the material when the entire structure is lifting and hoisting the material, thereby improving the stability of the material clamping and fixing.

[0049] By cooperating with each other between the telescopic rod 9 and the first slide groove 82 and the first slider 83, the use position of the side baffle 84 can be changed, and by cooperating with the telescopic connecting plate and the second biaxial telescopic rod 81, the use spacing between the two side baffles 84 can be changed.

[0050] This embodiment also provides a method for using the above-mentioned safety lifting device, including the steps of:

[0051] By using the hook in the safety lifting device body 1 to hook inside the hanging ring 10, and then using the safety lifting device body 1 to lift and hoist its fixing plate 2 to a suitable position and on top of the material, the first biaxial telescopic rod 4 is activated and extended to push the clamping plate 5 outward to move outward, thereby changing the distance between the two clamping plates 5 until the distance is greater than the length of the material.

[0052] Then, by starting the second biaxial telescopic rod 81 in the clamping structure, the side baffle 84 is pushed outward by extending the second biaxial telescopic rod 81, and the side baffle 84 moves outward, thereby driving the baffle 11 to move outward, thereby simultaneously expanding the distance between the two side baffles 84 and the baffle 11 until the distance between the baffles 11 is greater than the thickness of the material.

[0053] Then, by starting the telescopic rod 9, the telescopic rod 9 extends and the fixed plate 2 is in a stationary state, and then the telescopic connecting plate is pushed upward as the telescopic rod 9 extends, and then the side baffles 84 on both sides are driven to move downward. At the same time, the movement of the side baffles 84 drives the first slide 82 to move, thereby forcing the first slide 82 to move downward on the surface of the first slider 83. As the side baffles 84 move downward, the distance between the bottom of the side baffles 84 and the fixed plate 2 is increased until the distance is greater than the height of the material. Then, the fixed plate 2 is moved downward by the main body 1 of the safety lifting device, so that the bottom of the baffle 11 contacts the ground. Then, by starting the second double-axis extension The retraction rod 81 drives the first slider 83, the first slide groove 82 and the side baffle 84 and other structures to move inward through the retraction work of the second biaxial telescopic rod 81, thereby reducing the distance between the side baffle 84 and the fixed plate 2, and as the side baffle 84 moves, it will drive the telescopic connecting plate to perform telescopic work until the side baffle 84, the baffle 11 and the fixed plate 2 cooperate with each other to clamp and fix the material in the horizontal and vertical positions. At the same time, the retraction work of the first biaxial telescopic rod 4 is started to pull the splint 5 inward until the material is clamped and fixed in the front and rear positions through the splint 5, thereby completing the fixing work of the material, and then the material can be lifted and hoisted through the safety lifting device body 1.

[0054] When the splint 5 moves, the extension column 7 is simultaneously driven, causing the extension column 7 to perform a telescopic operation inside the receiving cavity 6 .

[0055] The above embodiment can adjust the length, width and thickness of the material according to the actual material through the mutual cooperation between the structures such as the safety lifting device body 1, the fixing plate 2, the installation groove 3, the first biaxial telescopic rod 4, the clamping plate 5, the second biaxial telescopic rod 81, the first slide groove 82, the first slider 83, the side baffle 84, and the telescopic rod 9. The operation steps are simple and convenient, so that the material can be clamped and fixed and the hoisting work can be carried out quickly and effectively, thereby improving work efficiency.

[0056] Example 2: Please refer to Figure 5-6 Based on the safety lifting device for railway construction and its use method provided in Example 1 of this application, Example 2 of this application proposes another safety lifting device for railway construction and its use method. Example 2 is merely a preferred embodiment of Example 1, and the implementation of Example 2 will not affect the implementation of Example 1 alone.

[0057] Specifically, the difference between the safety lifting device for railway construction and its use method provided in Example 2 of the present application is that, in the safety lifting device for railway construction, first through-holes 13 are provided on both the front and back sides of the interior of the fixed plate 2. A moving rod 14 is provided inside the first through-hole 13, and a connecting plate 15 is fixedly mounted on the top of the moving rod 14. The mutual cooperation between the first through-hole 13 and the moving rod 14 can improve the stability of the related structure during movement.

[0058] In this embodiment, an arc-shaped clamp 16 is rotatably connected to the bottom of the moving rod 14 , a connecting block 17 is rotatably connected to the outer side of the arc-shaped clamp 16 , and a connecting column 18 is rotatably connected to the top of the connecting block 17 .

[0059] In this embodiment, the connecting column 18 is rotated to a suitable position on the outside of the connected arc clamp 16. When the distance between the fixed plate 2 and the connecting plate 15 increases, the connecting column 18 can be driven to move and push the arc clamp 16 inward, so that the distance between the arc clamps 16 is reduced and closed together to clamp the material and fix it to the bottom of the fixed plate 2.

[0060] In this embodiment, the top of the connecting column 18 is rotatably connected to the outer side of the bottom of the fixing plate 2, and the front and back sides of the fixing plate 2 are both provided with installation cavities 19, and the interior of the installation cavity 19 is provided with an insertion rod 20.

[0061] In this embodiment, a tension spring 21 is provided on the surface of the insertion rod 20 and located outside the fixing plate 2 , and a locking groove 22 is provided on the surface of the moving rod 14 .

[0062] In this embodiment, the movable rod 14 can be fixed in position by cooperating between the card slot 22 and the insertion rod 20 as well as the tension spring 21 and the mounting cavity 19, so that the arc clamp 16 can be stably kept in a working state to avoid loosening and the inability to effectively clamp and fix the material.

[0063] The steps for using the lifting device in the above embodiment are as follows:

[0064] The safety lifting device and the top of the connecting plate 15 are installed together. When the material needs to be clamped and fixed, the fixing plate 2 can be moved to the top of the material, and the material is on the inner side of the two arc-shaped clamps 16. When the safety lifting device moves upward, it will drive the connecting plate 15 upward, and then the upward movement of the connecting plate 15 will drive the moving rod 14 to move upward, and the fixing plate 2 is in a relatively fixed state. At the same time, the moving rod 14 moves upward inside the first through hole 13, and then the upward movement of the moving rod 14 will drive The arc clamp 16 moves upward, and at this time the distance between the arc clamp 16 and the fixed plate 2 is reduced. As the distance between the arc clamp 16 and the fixed plate 2 is reduced, the connecting column 18 pushes the arc clamp 16 inward, causing the arc clamp 16 to rotate around the part where its top and the bottom of the moving rod 14 are rotatably connected. As the arc clamp 16 rotates, the material can be clamped and fixed at the bottom of the fixed plate 2 and on the inner side of the arc clamp 16, thereby completing the clamping and fixing of the material and then the lifting work can be carried out.

[0065] When the arc clamp 16 clamps the material and the moving rod 14 moves upward, it will drive the slot 22 to move upward until the arc clamps 16 on both sides contact each other, and the position of the slot 22 and the position of the installation cavity 19 are in alignment. At this time, the elastic deformation of the tension spring 21 pulls the insertion rod 20 inward, and the insertion rod 20 moves inward and moves inside the installation cavity 19, thereby inserting it into the slot 22 to fix the position of its moving rod 14, and at the same time fix the working state of its arc clamp 16.

[0066] The above embodiment can quickly clamp and fix the railway construction materials that need to be hoisted and lifted through the mutual cooperation between the first through hole 13, the moving rod 14, the connecting plate 15, the arc clamp 16, the connecting block 17, the connecting column 18, the installation cavity 19, the insertion rod 20, the tension spring 21, the card slot 22 and other structures, so that the material can be put into the working state more quickly, saving time and improving work efficiency.

[0067] Example 3: Please refer to Figure 7 Based on the safety lifting device for railway construction and its use method provided in Example 1 of this application, Example 3 of this application proposes another safety lifting device for railway construction and its use method. Example 3 is merely a preferred embodiment of Example 1, and the implementation of Example 3 will not affect the implementation of Example 1 alone.

[0068] Specifically, the difference between the safety lifting device for railway construction and the method of use provided in Example 3 of the present application is that, in a safety lifting device for railway construction, a second slide groove 23 is provided on the front and back sides of the top of the fixed plate 2, and a second slider 25 is slidably connected on both sides of the second slide groove 23, and a third biaxial telescopic rod 24 is fixedly installed on the inner side of the second slider 25 and inside the second slide groove 23.

[0069] In this embodiment, the top of the second slider 25 is rotatably connected to a linkage rod 26 , and the top of the linkage rod 26 is rotatably connected to a pull plate 27 . Second through holes 28 are provided on the front and back sides of the interior of the fixed plate 2 .

[0070] In this embodiment, a steel wire rope 29 is disposed inside the second through hole 28 , and both ends of the steel wire rope 29 are fixedly connected to the bottom of the pull plate 27 .

[0071] In this embodiment, fixed pulleys are fixedly installed on both sides of the bottom of the fixed plate 2 and on the inner side of the second through hole 28, and the wire rope 29 is on the surface of the fixed pulley. Therefore, the fixed pulley can prevent the wire rope 29 from generating friction with the fixed plate 2 during movement, thereby improving the stability and smoothness of the movement of the wire rope 29 and avoiding the situation where the service life of the related structure is shortened due to friction.

[0072] The steps for using the lifting device of the above embodiment are as follows:

[0073] By using the steel wire rope 29 to be sleeved on both sides of the material surface, and the material is on the inner side of the steel wire rope 29 and the fixed plate 2, and at this time by starting the third biaxial telescopic rod 24, the extension of the third biaxial telescopic rod 24 pushes the second slider 25 from the inside to the outside, prompting the second slider 25 to move inside the second slide groove 23, and then the movement of the second slider 25 drives the linkage rod 26 to move, and then the angle change caused by the movement of the linkage rod 26 pushes the pull plate 27 upward, and then the upward movement of the pull plate 27 drives the steel wire rope 29 to be forced to move inside its second through hole 28, thereby reducing the use length of the steel wire rope 29, and thus cooperating with the fixed plate 2 to bundle and fix the material between the fixed plate 2 and the steel wire rope 29.

[0074] The above embodiment can quickly bundle its materials through the mutual cooperation between the second slide groove 23, the third biaxial telescopic rod 24, the second slider 25, the linkage rod 26, the pull plate 27, the second through hole 28, the wire rope 29 and other structures, and has a simple structure and low production cost, thereby facilitating subsequent equipment maintenance work.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A safety lifting device for railway construction, characterized in that: The invention comprises a safety lifting device body (1), a fixing plate (2), a side block structure (8) and a telescopic rod (9), wherein: The fixing plate (2) is arranged at the bottom of the outer side of the main body (1) of the safety lifting device, and a mounting groove (3) is provided inside the fixing plate (2). A first biaxial telescopic rod (4) is fixedly installed inside the mounting groove (3), and clamping plates (5) are fixedly installed at the output ends of the first biaxial telescopic rod (4) and on the front and back sides of the fixing plate (2); The side baffle structure (8) is arranged on both sides of the fixed plate (2), and the side baffle structure (8) includes a side baffle (84), and a first slide groove (82) is provided on the front and back sides of the inner side of the side baffle (84); the first slide groove (82) is slidably connected to the inside of the first slide groove (82), and a second biaxial telescopic rod (81) is fixedly installed on the inner side of the first slide groove (83), and the fixed end of the second biaxial telescopic rod (81) is fixedly installed on the top of the fixed plate (2); The telescopic rod (9) is fixedly mounted on the front and back sides of the top of the side baffle (84) through a connecting plate (15), and the output end of the telescopic rod (9) is fixedly mounted on the top of the fixed plate (2); a hanging ring (10) is fixedly mounted on the top of the fixed plate (2), and a storage cavity (6) is provided on both sides of the interior of the fixed plate (2), and an extension column (7) is provided on both sides of the interior of the storage cavity (6), and the outer side of the extension column (7) is fixedly connected to the inner side of the clamping plate (5); The front and back sides of the fixed plate (2) are both provided with first through holes (13), a moving rod (14) is provided inside the first through hole (13), and a connecting plate (15) is fixedly installed on the top of the moving rod (14); The bottom of the moving rod (14) is rotatably provided with an arc-shaped clamp (16), the outer side of the arc-shaped clamp (16) is rotatably connected to a connecting block (17), and the top of the connecting block (17) is rotatably connected to a connecting column (18).

2. The safety lifting device for railway construction according to claim 1, characterized in that: A groove (12) is provided at the bottom of the inner side of the clamping plate (5).

3. The safety lifting device for railway construction according to claim 1, characterized in that: Baffles (11) are fixedly mounted on the front and back sides of the bottom of the side baffle (84).

4. The safety lifting device for railway construction according to claim 1, characterized in that: The top of the connecting column (18) is rotatably connected to the outer side of the bottom of the fixing plate (2), and the front and back sides of the fixing plate (2) are both provided with mounting cavities (19), and the interior of the mounting cavity (19) is provided with an insertion rod (20).

5. The safety lifting device for railway construction according to claim 4, characterized in that: A tension spring (21) is provided on the surface of the insertion rod (20) and located outside the fixing plate (2), and a clamping groove (22) is provided on the surface of the moving rod (14).

6. A method for using a safety lifting device for railway construction according to any one of claims 1 to 5, characterized in that: Including steps: Step 1: hoisting the fixing plate (2) to the top of the railway construction material to be hoisted by the safety hoisting device body (1); Step 2: Activate the first biaxial telescopic rod (4) to push the clamping plate (5) outward until the distance between the two clamping plates (5) is greater than the length of the material; Step 3: activating the side baffle structure (8) to enlarge the distance between the two side baffles (84), and driving the baffle (11) to move while the side baffle (84) moves, until the distance between the two baffles (11) is greater than the width of the material; Step 4: Then, by using the main body (1) of the safety lifting device, the fixing plate (2) is loosened and moved downward until the baffle (11) thereof contacts the ground. At this time, the telescopic rod (9) can be activated to change the height between the fixing plate (2) and the ground by extending or retracting the telescopic rod (9) until the height reaches a value similar to the thickness of the material stack. Step 5: Start the second biaxial telescopic rod (81) to drive the side baffles (84) on both sides to move and reduce the distance between them, and drive the baffle (11) to move. Since the baffle (11) is in contact with the ground, the material to be hoisted is clamped at the bottom of the fixed plate (2). At the same time, start the first biaxial telescopic rod (4) to drive the clamping plate (5) to move, reduce the distance between the two clamping plates (5), and thus clamp and fix the material in other directions. Then start the telescopic rod (9), and the retraction of the telescopic rod (9) drives the side baffles (84) and the baffle (11) to move upward, thereby changing the distance between the baffle (11) and the fixed plate (2). At this time, the material can be clamped and fixed in multiple directions. Then, the lifting and hoisting work can be carried out by using the safety lifting device body (1).

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