A lifting device and method for subway track laying

Abstract

This invention relates to the field of lifting equipment technology, specifically to a lifting equipment and method for subway track laying, comprising a gantry frame, a clamping assembly including a horizontally placed X-shaped movable frame, with suspension shafts at all four ends of the X-shaped movable frame; a handle frame is provided on the side of the side clamping plate away from the rail, and telescopic members are provided on both sides of the handle frame, with a rotating sleeve fixed at one end of the telescopic member; a positioning ball is provided on the surface of the horizontal plate near the handle frame; the beneficial effect is that by pushing the handle frame closer to the side clamping plate until the handle frame passes the midpoint between the two suspension shafts, the handle frame is blocked by the side clamping plate, and the telescopic members are in a compressed state. The telescopic members provide thrust so that the two suspension shafts are always away from each other, thus the two side clamping plates can always be close to each other, achieving stable clamping of the rail. Conversely, pulling the handle frame away from the side clamping plate can easily detach the side clamping plate from the rail. Therefore, this device can achieve both stable clamping and easy deployment.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, specifically to a lifting equipment and method for subway track laying. Background Technology

[0002] When laying tracks in a subway tunnel, gantry cranes and lifting devices are needed to lift the rails. The gantry cranes are equipped with winches and pulley blocks. The lifting devices are pulled by steel cables and driven by the winches to clamp, lift and lower, and move the rails in conjunction with the movement of the gantry cranes.

[0003] In the prior art, Chinese invention with publication number CN111439669A discloses a modular gantry crane for subway tunnel track laying construction and its usage method, which mainly uses a chain hoist in conjunction with an "X"-shaped clamp to clamp and lift the rails.

[0004] Currently, "X"-shaped clamps can maintain stability by utilizing the weight of the rail after lifting it into the air. However, when the rail is still on the ground, the clamp's gripping force is insufficient, and it is prone to detaching from the rail at the moment of lifting. Some clamps use torsion springs to ensure they remain clamped, but this makes unfolding the clamp difficult, requiring considerable effort from workers and increasing the risk of injury. Therefore, this invention proposes a lifting device and method for subway track laying to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a lifting device and method for subway track laying, so as to solve the problem mentioned in the background art that traditional clamps are difficult to balance stable clamping and easy deployment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lifting device for subway track laying, comprising a gantry, a steel rail provided below the gantry, a clamp assembly for lifting by steel cable clamped on the steel rail, the clamp assembly comprising a horizontally placed X-shaped movable frame, and a suspension shaft provided at each of the four ends of the X-shaped movable frame;

[0007] Side clamps are provided on both sides of the rail. A handle is provided on the side of the side clamp away from the rail. Telescopic components are provided on both sides of the handle. A rotating sleeve is fixed at one end of the telescopic component. A limit slider is provided on the outer side of the rotating sleeve. An installation groove for placing the rotating sleeve is opened in the middle of the limit slider. A notch is opened at the open end of one side of the installation groove. The limit slider and the rotating sleeve are rotatably sleeved on the middle of the corresponding suspension shaft.

[0008] Both the upper and lower sides of the handle frame are provided with cross plates, and the cross plates are fixedly connected to the side clamping plates. A positioning ball is provided on the surface of the cross plate close to the handle frame. A positioning groove corresponding to the positioning ball is formed on the surface of the handle frame. Guide chutes are formed at both ends of the cross plate, and the suspension shaft movably penetrates through the guide chutes and is slidably connected thereto.

[0009] Preferably, the handle frame includes two parallel connecting plates up and down. The positioning groove is formed on the surface of the connecting plate. A connecting shaft and a column are respectively fixedly connected between both ends of the two connecting plates. A notch parallel to the side clamping plate is formed at one end of the connecting plate close to the side clamping plate.

[0010] Preferably, an inner sleeve is movably sleeved on the outer side of the connecting shaft. An outer sleeve is movably sleeved on the outer side of the inner sleeve. A boss is fixed on the surface of the inner sleeve. The boss and the outer sleeve are respectively fixedly connected to the other ends of two telescopic members. A through groove for the boss to slide is formed on the surface of the outer sleeve.

[0011] Preferably, the telescopic member is a compression spring. Connecting platforms are fixed on the surface of the rotating sleeve, the surface of the boss and the surface of the outer sleeve. The connecting platform is inserted into the inner side of the end of the telescopic member and fixedly connected thereto.

[0012] Preferably, an avoidance groove is formed in the middle of the side of the side clamping plate away from the rail. The avoidance groove corresponds to the handle frame, and the size of the avoidance groove is smaller than that of the handle frame. Limit chutes are formed at both ends of the side of the side clamping plate away from the rail. A clamping groove is formed on the surface of the limit slider. The limit slider is slidably installed in the inner cavity of the limit chute through the clamping groove.

[0013] Preferably, the cross section of the side clamping plate is in a "卩" shape. A first roller is rotatably installed on the side of the side clamping plate close to the rail. A second roller is rotatably installed on the top surface of the side clamping plate. A round hole is formed on the side surface of the cross plate close to the handle frame. The positioning ball is movably embedded in the inner cavity of the round hole, and the inner diameter of the open end of the round hole is smaller than the diameter of the positioning ball. An elastic member is arranged in the inner cavity of the round hole. The elastic member pushes the positioning ball to be located at the open end of the round hole.

[0014] Preferably, a positioning frame is fixedly connected to one end of the side clamping plate. The positioning frame is an "L"-shaped angle steel. A threaded sleeve is fixedly penetrated through the middle of the positioning frame. An adjusting screw rod is movably penetrated through the inner cavity of the threaded sleeve through threads. One end of the adjusting screw rod is rotatably connected to a wear-resistant block, and the side surface of the wear-resistant block faces the rail.

[0015] Preferably, vertical friction lines are formed on the surface of the wear-resistant block. A connecting member is fixedly connected to the middle of the wear-resistant block. The connecting member is in a "T" shape and is rotatably installed inside one end of the adjusting screw rod. An adjusting knob is fixedly connected to the other end of the adjusting screw rod.

[0016] Preferably, the suspension shaft extends through the end of the X-shaped movable frame and a limit plate is fixed at the bottom of the suspension shaft. A fixed pulley is rotatably installed on the top of the suspension shaft via a support. A protective cover is provided on the outside of the fixed pulley. Two steel wire ropes are fixedly installed at the lower end of the steel cable. The steel wire ropes are triangular and are sleeved on the outside of the corresponding two fixed pulleys.

[0017] A method for using the lifting hoisting device for subway track laying as described above specifically includes the following steps:

[0018] Step 1: The staff pulls the handle away from the side clamps until the handle is separated from the two horizontal plates. The handle is in a free state, and the telescopic parts extend freely due to the elasticity, releasing the thrust on the suspension shaft. The two suspension shafts move closer to each other, and the X-shaped movable frame rotates and unfolds accordingly. The two side clamps move away from each other, and the entire clamp assembly is in an unfolded state at this time.

[0019] Step 2: Place the unfolded clamp assembly on the outside of the rail from top to bottom, and push the handle frame closer to the side clamps until the handle frame passes the center point between the two suspension shafts. The handle frame is blocked by the side clamps and cannot move further. The telescopic component is in a compressed state. The thrust generated by the telescopic component on the suspension shafts causes the two suspension shafts to move away from each other. At this time, the clamp assembly is in a folded state. The two side clamps clamp the rail from both sides and are pushed by the telescopic component. The clamp assembly cannot unfold automatically at this time.

[0020] Step 3: Wind up the steel cable. This device lifts the rail. After the rail is suspended in the air, the tension generated by the wire rope on the fixed pulley causes the X-shaped movable frame to always have a folding tendency, ensuring that the clamping assembly keeps the rail clamped stably.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention features side clamps on both sides of a rail, with a horizontal plate fixed to each side clamp. Guide grooves are formed at both ends of the horizontal plate, through which a suspension shaft slides. A handle is positioned between two suspension shafts on the same side of the rail. Telescopic components are located on both sides of the handle, with rotating sleeves fixed to the ends of each component. A limit slider is provided on the outer side of the rotating sleeve, with a mounting groove in the center for the rotating sleeve to rotate. A notch is provided at one side of the mounting groove. In use:

[0023] ① By pushing the handle frame closer to the side clamps until the handle frame passes the midpoint between the two suspension shafts, the handle frame is blocked by the side clamps and the telescopic component is in a compressed state. The telescopic component provides thrust so that the two suspension shafts are always away from each other. Therefore, the two side clamps can always be close to each other, so as to achieve stable clamping of the rail.

[0024] ② Conversely, when the staff pulls the handle away from the side plate until it crosses the midpoint between the two suspension shafts, the handle is in a free state, the telescopic parts can be fully extended and no longer compressed, and the X-shaped movable frame can be folded or unfolded freely, so that the side plate can be easily separated from the rail.

[0025] Therefore, this device can balance stable clamping and easy deployment. Attached Figure Description

[0026] Figure 1 This is a side view of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the clamping structure of the clamping assembly of the present invention;

[0028] Figure 3 This is a three-dimensional schematic diagram of the X-shaped movable frame structure of the present invention;

[0029] Figure 4 This is a schematic diagram showing the separation of the side clamp and the horizontal plate structure of the present invention;

[0030] Figure 5 This is a three-dimensional schematic diagram of the side clamping plate structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the handle frame structure installation of the present invention;

[0032] Figure 7 This is a schematic diagram showing the separation of the rotating sleeve and the limiting slider structure of the present invention;

[0033] Figure 8 This is an exploded view of the handle structure of the present invention;

[0034] Figure 9 This is a schematic diagram illustrating the movement of the handle structure according to the present invention;

[0035] Figure 10 This is a three-dimensional schematic diagram of the positioning frame structure of the present invention;

[0036] Figure 11 This is a cross-sectional schematic diagram of the positioning frame structure of the present invention.

[0037] In the diagram: 1. Gantry; 2. Steel cable; 21. Steel wire rope; 3. Clamp assembly; 31. X-shaped movable frame; 311. Fixed pulley; 32. Suspension shaft; 321. Limiting plate; 4. Steel rail; 5. Side clamping plate; 51. First roller; 52. Second roller; 53. Clearance groove; 54. Limiting slide groove; 6. Horizontal plate; 61. Guide slide groove; 62. Positioning ball; 63. Elastic element; 7. Handle bracket; 701. Connecting plate; 7 02. Connecting shaft; 703. Column; 704. Positioning groove; 71. Limiting slider; 72. Mounting groove; 73. Rotating sleeve; 74. Connecting platform; 75. Telescopic component; 76. Notch; 77. Slot; 78. Inner sleeve; 781. Boss; 79. Outer sleeve; 791. Through groove; 8. Positioning bracket; 81. Adjusting screw; 82. Adjusting knob; 83. Wear-resistant block; 831. Friction texture; 84. Connecting component. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 11 The present invention provides a technical solution:

[0040] Example 1: A lifting device for subway track laying includes a gantry 1, with a rail 4 installed below the gantry 1. A clamp assembly 3, which is lifted by a steel cable 2, is clamped on the rail 4. A winch is also installed on the gantry 1 to wind or unwind the steel cable 2. After the clamp assembly 3 clamps the rail 4, the rail 4 can be lifted by winding the steel cable 2 through the winch. At least two clamp assemblies 3 are provided to ensure the stability of the rail 4 and prevent the rail 4 from tilting.

[0041] Specifically, the clamp assembly 3 includes a horizontally placed X-shaped movable frame 31. A rotating shaft is located in the middle of the X-shaped movable frame 31, allowing it to unfold or fold around the rotating shaft. Suspension shafts 32 are located at all four ends of the X-shaped movable frame 31. When the X-shaped movable frame 31 is rotated, unfolded, or folded, it can drive the suspension shafts 32 to move. Figure 2 As shown, the clamping assembly 3 of this device is symmetrically distributed on both sides of the rail 4;

[0042] Secondly, side clamps 5 are installed on both sides of the rail 4, such as Figure 4As shown, the side clamp 5 is located between the rail 4 and the suspension shaft 32. When the X-shaped movable frame 31 is folded, the suspension shaft 32 moves and presses the side clamp 5 closer to the rail 4 until the side clamp 5 is inserted into the inner side of the rail 4. At this time, the side clamp 5 can clamp the rail 4 in the horizontal direction and lift the rail 4 in the vertical direction. A handle 7 is provided on the side of the side clamp 5 away from the rail 4. Telescopic members 75 are provided on both sides of the handle 7. The telescopic members 75 can elastically extend and retract. A rotating sleeve 73 is fixed at one end of the telescopic member 75. A limit slider 71 is provided on the outer side of the rotating sleeve 73. The limit slider 71 has an installation groove 72 in the middle for the rotating sleeve 73 to be placed. Figure 7 As shown, the rotating sleeve 73 and the limiting slider 71 can rotate relative to each other, and a notch 76 is provided at the open end of one side of the mounting groove 72. Both the limiting slider 71 and the rotating sleeve 73 are rotatably sleeved on the middle of the corresponding suspension shaft 32, as shown. Figure 9 As shown, when the handle 7 moves, the telescopic component 75 rotates accordingly. At this time, the rotating sleeve 73 can rotate within the mounting groove 72. The notch 76 is used to increase the opening size of the mounting groove 72, ensuring that the handle 7 can move to... Figure 9 The location shown above is as follows:

[0043] When the staff pushes the handle 7 close to the side clamp 5 until the handle 7 passes the center point between the two suspension shafts 32, the handle 7 is blocked by the side clamp 5 and cannot move further. At this time, the telescopic component 75 is in a compressed state and provides a thrust to the suspension shaft 32. Therefore, the two suspension shafts 32 located on the same side of the rail 4 will move away from each other. That is, the clamp assembly 3 is in a folded state and can automatically clamp and tighten the rail 4.

[0044] Conversely, when the staff pulls the handle 7 away from the side clamp 5 until the handle 7 moves in the opposite direction past the center point between the two suspension shafts 32, the handle 7 is in a free state, the telescopic component 75 is fully extended and no longer provides thrust to the suspension shaft 32, so the clamp assembly 3 is in a loose state and can be easily extended, thereby achieving separation from the rail 4.

[0045] Furthermore, horizontal plates 6 are provided on both the upper and lower sides of the handle frame 7, and the horizontal plates 6 are fixedly connected to the side clamps 5. Positioning balls 62 are provided on the surface of the horizontal plates 6 near the handle frame 7, and positioning grooves 704 corresponding to the positioning balls 62 are formed on the surface of the handle frame 7. Figure 6 As shown, when the handle 7 is positioned between the two horizontal plates 6, the positioning ball 62 can be engaged in the inner cavity of the positioning groove 704, thereby positioning the handle 7 and preventing the handle 7 from easily shifting position. Figure 9As shown, the aforementioned "designated position" refers to the position after the handle 7 moves close to the side clamping plate 5 and passes the center point between the two suspension shafts 32. In addition, guide grooves 61 are provided at both ends of the horizontal plate 6. The suspension shafts 32 move through the guide grooves 61 and slide with them. Since the suspension shafts 32 can only slide within the cavity of the guide grooves 61, the X-shaped movable frame 31 can drive the two side clamping plates 5 to move away from or closer to each other when unfolding or folding, thereby realizing the clamping or separation of the side clamping plates 5 from the rail 4.

[0046] To facilitate operation of the handle 7 by staff, the handle 7 of this application includes two parallel connecting plates 701, with positioning grooves 704 formed on the surface of the connecting plates 701. A connecting shaft 702 and a column 703 are fixedly connected between the two ends of the two connecting plates 701, respectively. A cut parallel to the side clamping plate 5 is formed at one end of the connecting plate 701. Figure 8 As shown, when operating this device, the operator only needs to push or pull the column 703. In addition, the overall thickness of the handle 7 is consistent with the spacing between the two horizontal plates 6, which can be used to prevent the handle 7 from tilting in the vertical direction.

[0047] To connect the telescopic component 75 to the handle bracket 7, this application further includes an inner sleeve 78 movably sleeved on the outside of the connecting shaft 702, and an outer sleeve 79 movably sleeved on the outside of the inner sleeve 78. Both the inner sleeve 78 and the outer sleeve 79 can rotate independently. A boss 781 is fixed on the surface of the inner sleeve 78. The boss 781 and the outer sleeve 79 are respectively fixedly connected to the other ends of the two telescopic components 75. A through groove 791 is provided on the surface of the outer sleeve 79 for the boss 781 to slide. The through groove 791 is provided to avoid motion interference between the rotation of the boss 781 and the outer sleeve 79, and at the same time, it can limit the inner sleeve 78 and the outer sleeve 79 to prevent them from being misaligned and separated in the vertical direction. Figure 8 As shown, two telescopic components 75 are symmetrically distributed on the left and right sides of the handle frame 7. When the handle frame 7 moves, the two telescopic components 75 can move simultaneously.

[0048] To connect the end of the telescopic component 75, the telescopic component 75 of this application is a thrust spring. Connecting platforms 74 are fixed to the surface of the rotating sleeve 73, the surface of the boss 781, and the surface of the outer sleeve 79. The connecting platforms 74 are inserted into and fixedly connected to the inner side of the end of the telescopic component 75. The connecting platforms 74 are mainly used to facilitate the fixed connection of the end of the telescopic component 75. Furthermore, as... Figure 7 As shown, the rotation angle of the rotating sleeve 73 in the inner cavity of the mounting groove 72 is limited by the connecting platform 74, so a notch 76 needs to be opened to increase the rotation angle of the connecting platform 74.

[0049] In addition, the telescopic member 75 of the present device can also be an elastic telescopic rod with a built-in spring. Compared with the thrust spring, the elastic telescopic rod will not bend by itself and is more suitable for the use of this device. In this application, the thrust spring is mainly used as an example, and the installation and connection method of the elastic telescopic rod will not be elaborated here.

[0050] In order to improve the connection strength between the side splint 5 and the suspension shaft 32, this application also has an avoidance groove 53 opened in the middle of the side surface of the side splint 5 away from the rail 4. The avoidance groove 53 corresponds to the handle frame 7, and the size of the avoidance groove 53 is smaller than the size of the handle frame 7. Combining Figure 4 and Figure 8 it can be seen that the setting of the avoidance groove 53 is mainly used to avoid the outer sleeve 79, preventing the rotation of the outer sleeve 79 from being blocked by the side splint 5. The entire handle frame 7 will not move into the inner cavity of the avoidance groove 53. That is to say, when the handle frame 7 moves closer to the side splint 5, it will抵住 the surface of the side splint 5, so as to ensure that the telescopic member 75 is in a compressed state at this time. In addition, limiting chute 54s are opened at both ends of the side surface of the side splint 5 away from the rail 4. A clamping groove 77 is opened on the surface of the limiting slider 71. The limiting slider 71 is slidably installed in the inner cavity of the limiting chute 54 by means of the clamping groove 77. Combining Figure 7 and Figure 4 as shown, the length directions of the guiding chute 61 and the limiting chute 54 are the same. The sliding connection between the limiting chute 54 and the limiting slider 71 can improve the connection strength between the suspension shaft 32 and the side splint 5, preventing the side splint 5 from separating from the suspension shaft 32 due to the excessive weight of the rail 4.

[0051] In order to facilitate the assembly of the rail 4, the cross-section of the side splint 5 of this application is in a "卩" shape. A first roller 51 is rotatably installed on the side surface of the side splint 5 close to the rail 4, and a second roller 52 is rotatably installed on the top surface of the side splint 5. As Figure 5 shown, the first roller 51 horizontally abuts against the side surface of the rail 4, and the second roller 52 abuts against the lower surface of the upper flange of the rail 4 from bottom to top. Both can reduce the friction between the side splint 5 and the rail 4, so as to facilitate the staff to slightly adjust the position of the rail 4 along the length direction of the rail 4 when assembling the rail 4.

[0052] In order to install the positioning ball 62, this application also has a round hole opened on the side surface of the cross plate 6 close to the handle frame 7. The positioning ball 62 is movably embedded in the inner cavity of the round hole, and the inner diameter of the open end of the round hole is smaller than the diameter of the positioning ball 62. An elastic member 63 is arranged in the inner cavity of the round hole. The elastic member 63 pushes the positioning ball 62 to be located at the open end of the round hole. When the positioning ball 62 is squeezed by the handle frame 7, it can be received into the inner cavity of the round hole. When the handle frame 7 and the cross plate 6 move away from each other, although the positioning ball 62 will move towards the open end of the round hole under the thrust of the elastic member 63, it will not脱离 from the inner cavity of the round hole.

[0053] To prevent easy relative movement between the rail 4 and the clamp assembly 3, this application also includes a positioning frame 8 fixedly connected to one end of the side clamping plate 5. The positioning frame 8 is an "L"-shaped angle steel, and a threaded sleeve is fixedly and through the middle of the positioning frame 8. An adjusting screw 81 is movably installed through the inner cavity of the threaded sleeve via a thread. One end of the adjusting screw 81 is rotatably connected to a wear-resistant block 83, and the surface of the wear-resistant block 83 faces the side of the rail 4. Figure 4 and Figure 10 As shown, when the adjusting screw 81 rotates, it can push the wear-resistant block 83 to move closer to or further away from the rail 4. When the wear-resistant block 83 is in contact with the side of the rail 4, the sliding friction between the two can position the rail 4, preventing the clamping assembly 3 of this device from easily moving relative to the rail 4.

[0054] To facilitate the control of the position of the wear-resistant block 83 by the staff, this application also has vertical friction grooves 831 on the surface of the wear-resistant block 83 to increase the friction between the wear-resistant block 83 and the side of the rail 4. A connector 84 is fixedly connected to the middle of the wear-resistant block 83. The connector 84 is T-shaped and rotatably installed inside one end of the adjusting screw 81. An adjusting knob 82 is fixedly connected to the other end of the adjusting screw 81. Therefore, the staff only needs to turn the adjusting knob 82 to control the wear-resistant block 83 to be close to or away from the rail 4.

[0055] To drive the X-shaped movable frame 31 to fold, the suspension shaft 32 of this application movably passes through the end of the X-shaped movable frame 31, and a limit plate 321 is fixed to the bottom of the suspension shaft 32. A fixed pulley 311 is rotatably mounted on the top of the suspension shaft 32 via a support, and a protective cover is provided on the outer side of the fixed pulley 311. Figure 3 As shown, the support at the bottom of the fixed pulley 311 can prevent the suspension shaft 32 from separating from the X-shaped movable frame 31. Two steel wire ropes 21 are fixedly installed at the lower end of the steel cable 2. The steel wire ropes 21 are triangular and are sleeved on the outside of the corresponding two fixed pulleys 311. When the steel cable 2 is wound up and tightened by the winch, the steel wire ropes 21 can drive the fixed pulleys 311 at both ends to rotate and move closer to each other, thereby driving the X-shaped movable frame 31 to fold, thus realizing the clamping of the side clamping plate 5 on the rail 4.

[0056] The present invention also discloses a method for using the lifting hoist for subway track laying as described above, specifically including the following steps:

[0057] Step 1: The staff pulls the handle frame 7 away from the side clamp 5 until the handle frame 7 is separated from the two horizontal plates 6. The handle frame 7 is in a free state, and the telescopic part 75 extends freely due to the elastic force, releasing the thrust generated on the suspension shaft 32. The two suspension shafts 32 move closer to each other, and the X-shaped movable frame 31 rotates and unfolds accordingly. The two side clamps 5 move away from each other. At this time, the clamp assembly 3 is in an unfolded state.

[0058] Step 2: Place the unfolded clamp assembly 3 on the outside of the rail 4 from top to bottom, and push the handle 7 close to the side clamp 5 until the handle 7 passes the center point between the two suspension shafts 32. The handle 7 is blocked by the side clamp 5 and cannot move further. The telescopic component 75 is in a compressed state. The thrust generated by the telescopic component 75 on the suspension shaft 32 causes the two suspension shafts 32 to move away from each other. At this time, the clamp assembly 3 is in a folded state. The two side clamps 5 clamp the rail 4 from both sides and are pushed by the telescopic component 75. The clamp assembly 3 cannot unfold automatically at this time.

[0059] Step 3: Wind up the steel cable 2. This device lifts the rail 4. After the rail 4 is suspended, the tension generated by the wire rope 21 on the fixed pulley 311 causes the X-shaped movable frame 31 to always have a folding tendency, ensuring that the clamping assembly 3 keeps the clamping of the rail 4 stable.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting device for subway track laying, comprising a gantry (1), wherein a rail (4) is disposed below the gantry (1), and a clamp assembly (3) for lifting by a steel cable (2) is clamped on the rail (4), characterized in that: The clamp assembly (3) includes a horizontally placed X-shaped movable frame (31), and each of the four ends of the X-shaped movable frame (31) is provided with a suspension shaft (32). Side clamps (5) are provided on both sides of the rail (4). A handle frame (7) is provided on the side of the side clamp (5) away from the rail (4). Telescopic components (75) are provided on both sides of the handle frame (7). A rotating sleeve (73) is fixed at one end of the telescopic component (75). A limiting slider (71) is provided on the outside of the rotating sleeve (73). An installation groove (72) for placing the rotating sleeve (73) is opened in the middle of the limiting slider (71). A notch (76) is opened at the open end of one side of the installation groove (72). The limiting slider (71) and the rotating sleeve (73) are both rotatably sleeved on the middle of the corresponding suspension shaft (32). The handle frame (7) is provided with a horizontal plate (6) on both the upper and lower sides, and the horizontal plate (6) is fixedly connected to the side clamp (5). The horizontal plate (6) is provided with a positioning ball (62) near the surface of the handle frame (7). The surface of the handle frame (7) is provided with a positioning groove (704) corresponding to the positioning ball (62). The two ends of the horizontal plate (6) are provided with guide grooves (61). The suspension shaft (32) moves through the guide groove (61) and slides with it. The handle frame (7) includes two parallel connecting plates (701) on the top and bottom. The positioning groove (704) is opened on the surface of the connecting plate (701). A connecting shaft (702) and a column (703) are fixedly connected between the two ends of the two connecting plates (701). The end of the connecting plate (701) near the side clamp (5) has a cut parallel to the side clamp (5). An inner sleeve (78) is movably fitted on the outer side of the connecting shaft (702), and an outer sleeve (79) is movably fitted on the outer side of the inner sleeve (78). A boss (781) is fixed on the surface of the inner sleeve (78). The boss (781) and the outer sleeve (79) are respectively fixedly connected to the other end of two telescopic members (75). A through groove (791) is opened on the surface of the outer sleeve (79) for the boss (781) to slide. The side clamp (5) away from the rail (4) has a relief groove (53) in the middle of its side. The relief groove (53) corresponds to the handle frame (7) and the size of the relief groove (53) is smaller than the size of the handle frame (7). The side clamp (5) away from the rail (4) has limit slide grooves (54) at both ends. The surface of the limit slider (71) has a slot (77). The limit slider (71) is slidably installed in the cavity of the limit slide groove (54) through the slot (77).

2. The lifting device for subway track laying according to claim 1, characterized in that: The telescopic component (75) is a thrust spring. The rotating sleeve (73), the boss (781), and the outer sleeve (79) are all fixed with connecting platforms (74). The connecting platforms (74) are inserted into the inner side of the end of the telescopic component (75) and fixedly connected to it.

3. A lifting device for subway track laying according to claim 2, characterized in that: The cross-section of the side clamping plate (5) is in the shape of "卩", a first roller (51) is rotatably installed on one side surface of the side clamping plate (5) close to the rail (4), a second roller (52) is rotatably installed on the top surface of the side clamping plate (5), a circular hole is formed on one side surface of the cross plate (6) close to the handle frame (7), a positioning ball (62) is movably embedded in the inner cavity of the circular hole, and the inner diameter of the open end of the circular hole is smaller than the diameter of the positioning ball (62). An elastic member (63) is arranged in the inner cavity of the circular hole, and the elastic member (63) pushes the positioning ball (62) to be located at the open end of the circular hole.

4. A lifting device for subway track laying according to claim 1, characterized in that: One end of the side clamping plate (5) is fixedly connected with a positioning frame (8), the positioning frame (8) is an "L"-shaped angle steel, a threaded sleeve is fixedly penetrated through the middle of the positioning frame (8), an adjusting screw rod (81) is movably penetrated through the inner cavity of the threaded sleeve by threads, and one end of the adjusting screw rod (81) is rotatably connected with a wear-resistant block (83), and the surface of the wear-resistant block (83) faces the side surface of the rail (4).

5. A lifting device for subway track laying according to claim 4, characterized in that: Vertical friction lines (831) are formed on the surface of the wear-resistant block (83), a connecting member (84) is fixedly connected to the middle of the wear-resistant block (83), the connecting member (84) is in a "T" shape and is rotatably installed inside one end of the adjusting screw rod (81), and an adjusting knob (82) is fixedly connected to the other end of the adjusting screw rod (81).

6. A lifting device for subway track laying according to claim 1, characterized in that: The suspension shaft (32) movably penetrates through the end of the X-shaped movable frame (31), and a limiting plate (321) is fixed to the bottom of the suspension shaft (32). A fixed pulley (311) is rotatably installed at the top of the suspension shaft (32) through a support. A protective cover is arranged outside the fixed pulley (311). Two steel wires (21) are fixedly arranged at the lower end of the steel cable (2). The steel wires (21) are in a triangular shape and are sleeved outside the corresponding two fixed pulleys (311).

7. A method of using a lifting hoist for subway track laying according to claim 6, characterized in that: Specifically, it includes the following steps: Step 1: The staff pulls the handle frame (7) away from the side clamping plate (5) until the handle frame (7) disengages from between the two cross plates (6). The handle frame (7) is in a free state, and the telescopic member (75) freely extends due to the elastic force, releasing the thrust generated on the suspension shaft (32). The two suspension shafts (32) move closer to each other, and the X-shaped movable frame (31) rotates and expands accordingly. The two side clamping plates (5) move away from each other. At this time, the clamping fixture assembly (3) is in an unfolded state as a whole. Step 2: Place the unfolded clamping fixture assembly (3) from top to bottom outside the rail (4). Push the handle frame (7) to move closer to the side clamping plate (5) until the handle frame (7) crosses the center point between the two suspension shafts (32). The handle frame (7) is blocked by the side clamping plate (5) and cannot move forward. The telescopic member (75) is in a compressed state. The thrust generated by the telescopic member (75) on the suspension shaft (32) causes the two suspension shafts (32) to move away from each other. At this time, the clamping fixture assembly (3) is in a folded state as a whole. The two side clamping plates (5) clamp the rail (4) from both sides respectively. And under the action of the thrust of the telescopic member (75), the clamping fixture assembly (3) as a whole cannot be automatically unfolded at this time. Step 3: Wind up the steel cable (2). This device lifts the rail (4). After the rail (4) is suspended, the tension generated by the wire rope (21) on the fixed pulley (311) drives the X-shaped movable frame (31) to always have a folding tendency, ensuring that the clamping assembly (3) keeps the clamping of the rail (4) stable.

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