Lifting sling and method for metro track laying

Abstract

The invention relates to the technical field of lifting appliances, in particular to a lifting appliance and method for subway track laying, the lifting appliance comprises a portal frame, a clamp assembly comprises a horizontally placed X-shaped movable frame, and suspension shafts are arranged at the four ends of the X-shaped movable frame; handle frames are arranged on the sides, away from the steel rails, of the side clamping plates, telescopic pieces are arranged on the two sides of each handle frame, and rotating sleeves are fixed to one ends of the telescopic pieces; positioning balls are arranged on the surface, close to the handle frame, of the transverse plate; the device has the beneficial effects that the handle frame is pushed to be close to the side clamping plates until the handle frame crosses the middle point between the two suspension shafts, at the moment, the handle frame is blocked by the side clamping plates, the telescopic piece is in a compressed state, the telescopic piece provides pushing force to enable the two suspension shafts to be away from each other all the time, and therefore the two side clamping plates can be close to each other all the time; on the contrary, the handle frame is pulled to be away from the side clamping plate, the side clamping plate can be easily separated from the steel rail, and therefore the device can have the functions of stable clamping and easy unfolding.

Description

Technical Field

[0001] The invention relates to the technical field of slings, and in particular to a lifting sling and a method for subway track laying. Background Art

[0002] When laying tracks in subway tunnels, the rails are hoisted with the help of a gantry and a hoisting device. A winch and a pulley block are installed on the gantry. The hoisting device is pulled by a steel cable and driven by the winch device to clamp and lift, and the lifting and transfer of the rails are achieved in conjunction with the movement of the gantry.

[0003] In the prior art, a Chinese invention with publication number CN111439669A discloses an assembled rail hanging gantry for loose-laid rail construction in subway tunnels and a method of using the gantry, which mainly clamps and hoists the rails through a chain hoist in cooperation with an "X"-shaped clamp.

[0004] At present, after the "X"-shaped clamp lifts the rail into the air, it can use the gravity of the rail to ensure its own clamping stability. However, when the rail is still on the ground, the clamp's own clamping force is insufficient and it is easy to separate from the rail at the moment of lifting. Some clamps add torsion springs to ensure that the clamp is always in a clamped state, but this makes it difficult to unfold the clamp, and the staff is more laborious when opening the clamp and is easily injured by the clamp. To this end, the present invention proposes a lifting sling and method for subway track laying to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a lifting device and method for subway track laying, so as to solve the problem that the traditional clamps mentioned in the above background technology are difficult to achieve both stable clamping and easy deployment.

[0006] To achieve the above object, the present invention provides the following technical solution: a lifting device for subway track laying, comprising a gantry, a steel rail is arranged below the gantry, a clamp assembly hoisted by a steel cable is clamped on the steel rail, the clamp assembly comprises a horizontally placed X-shaped movable frame, and four ends of the X-shaped movable frame are all provided with suspension shafts;

[0007] Side clamps are provided on both sides of the rails, a handle frame is provided on the side of the side clamps away from the rails, telescopic parts are provided on both sides of the handle frame, a rotating sleeve is fixed at one end of the telescopic part, a limit slider is provided on the outside of the rotating sleeve, a mounting groove for the rotating sleeve is provided in the middle of the limit slider, a notch is provided at one open end of the mounting groove, and the limit slider and the rotating sleeve are both rotatably sleeved in 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 the two ends of the two connecting plates. An incision 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, and 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 thrust 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, and 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, and a second roller is rotatably installed on the top surface of the side clamping plate. A round hole is formed on the side 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, and 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 surface of the wear-resistant block faces the side of 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 movably passes through the end of the X-shaped movable frame, and a limiting plate is fixed to the bottom of the suspension shaft. A fixed pulley is rotatably installed on the top of the suspension shaft through a support, and a protective cover is provided on the outer side of the fixed pulley. Two steel ropes are fixedly provided at the lower end of the steel cable. The steel ropes are triangular and are sleeved on the outer sides of the corresponding two fixed pulleys.

[0017] A method for using the lifting sling for subway track laying according to the above-mentioned method specifically comprises the following steps:

[0018] Step 1: The staff pulls the handle frame away from the side clamping plate until the handle frame is separated from between the two horizontal plates. The handle frame is in a free state, and the telescopic member freely extends due to elastic force, 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, and the two side clamping plates move away from each other. At this time, the clamp assembly is in an unfolded state as a whole;

[0019] Step 2: Place the unfolded clamp assembly from top to bottom on the outside of the rail, push the handle frame to move close to the side clamp plate until the handle frame passes the center point between the two suspension shafts. The handle frame is blocked by the side clamp plate and cannot move further. The telescopic member is in a compressed state. The thrust generated by the telescopic member on the suspension shaft causes the two suspension shafts to move away from each other. At this time, the clamp assembly as a whole is in a folded state. The two side clamp plates clamp the rail from both sides respectively, and under the thrust of the telescopic member, the clamp assembly as a whole cannot be automatically unfolded at this time.

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

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention is provided with side clamps on both sides of the rail, a transverse plate is fixed on the side clamps, guide slots are provided at both ends of the transverse plate, a suspension shaft passes through the guide slots and is slidably connected thereto, a handle frame is provided between the two suspension shafts on the same side of the rail, telescopic parts are provided on both sides of the handle frame, a rotating sleeve is fixed at the ends of the two telescopic parts, a limiting slider is provided on the outer side of the rotating sleeve, a mounting slot for the rotating sleeve to rotate is provided in the middle of the limiting slider, a notch is provided at one side opening of the mounting slot, when in use:

[0023] ① The staff pushes the handle frame close to the side clamping plate until the handle frame passes the midpoint between the two suspension shafts. At this time, the handle frame is blocked by the side clamping plate and the telescopic member is in a compressed state. The telescopic member provides thrust to keep the two suspension shafts away from each other. Therefore, the two side clamping plates can always be close to each other to achieve stable clamping of the rails.

[0024] ② On the contrary, the staff pulls the handle frame away from the side clamp until it crosses the midpoint between the two suspension shafts in the opposite direction. At this time, the handle frame is in a free state, the telescopic part can be fully extended and no longer compressed, and the X-shaped movable frame can be freely folded or unfolded, so that the side clamp can be easily separated from the rail;

[0025] Therefore, the device can take into account the functions of stable clamping and easy deployment. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0030] Figure 5 It is a three-dimensional schematic diagram of the side splint structure of the present invention;

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

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

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

[0034] Fig. 9 This is a schematic diagram of the movement of the handle frame structure of the present invention;

[0035] Fig.10 It is a three-dimensional schematic diagram of the positioning frame structure of the present invention;

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

[0037] In the figure: 1, door frame; 2, steel cable; 21, steel wire rope; 3, clamp assembly; 31, X-shaped movable frame; 311, fixed pulley; 32, suspension shaft; 321, limit plate; 4, rail; 5, side clamp; 51, first roller; 52, second roller; 53, avoidance groove; 54, limit slide; 6, cross plate; 61, guide slide; 62, positioning ball; 63, elastic member; 7, handle frame; 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 part; 76, notch; 77, slot; 78, inner sleeve; 781, boss; 79, outer sleeve; 791, through slot; 8, positioning frame; 81, adjusting screw; 82, adjusting knob; 83, wear-resistant block; 831, friction pattern; 84, connecting part. DETAILED DESCRIPTION

[0038] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figures 1 to 11 , the present invention provides a technical solution:

[0040] Embodiment 1, a lifting hoist for subway track laying, comprises a gantry 1, a rail 4 is arranged below the gantry 1, a clamp assembly 3 lifted by a steel cable 2 is clamped on the rail 4, a winch for winding or unwinding the steel cable 2 is also arranged on the gantry 1, after the clamp assembly 3 clamps the rail 4, the steel cable 2 can be wound up by the winch to lift the rail 4, at least two clamp assemblies 3 are arranged to ensure the stability of the rail 4 and prevent the rail 4 from tilting.

[0041] Specifically, the fixture assembly 3 includes a horizontally placed X-shaped movable frame 31, a rotating shaft is provided in the middle of the X-shaped movable frame 31, and the X-shaped movable frame 31 can be unfolded or folded around the rotating shaft. Suspension shafts 32 are provided at the 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 shaft 32 to move. Figure 2 As shown, the clamp assembly 3 of the device is symmetrically distributed on both sides of the rail 4;

[0042] Secondly, side clamps 5 are provided on both sides of the rail 4. Figure 4As shown, the side clamping plate 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 squeezes the side clamping plate 5 close to the rail 4 until the side clamping plate 5 is stuck into the inner side of the side of the rail 4. At this time, the side clamping plate 5 can clamp the rail 4 in the horizontal direction and lift the rail 4 in the vertical direction. A handle frame 7 is provided on the side of the side clamping plate 5 away from the rail 4. Both sides of the handle frame 7 are provided with telescopic members 75. The telescopic member 75 itself can be elastically retracted. A rotating sleeve 73 is fixed at one end of the telescopic member 75. A limiting slider 71 is provided on the outer side of the rotating sleeve 73. A mounting groove 72 for placing the rotating sleeve 73 is provided in the middle of the limiting slider 71. 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 one open end of the mounting groove 72. The limiting slider 71 and the rotating sleeve 73 are both rotatably sleeved on the middle of the corresponding suspension shaft 32, as shown in FIG. Fig. 9 As shown, when the handle frame 7 moves, the telescopic member 75 rotates and moves accordingly, and the rotating sleeve 73 can rotate in the inner cavity of the installation groove 72. The opening 76 is used to increase the opening size of the installation groove 72 to ensure that the handle frame 7 can move to Fig. 9 The locations shown above are as follows:

[0043] The staff pushes the handle frame 7 to approach the side clamping plate 5 until the handle frame 7 passes the center point between the two suspension shafts 32. The handle frame 7 is blocked by the side clamping plate 5 and cannot move further. At this time, the telescopic member 75 is in a compressed state, and the telescopic member 75 provides thrust to the suspension shaft 32. Therefore, the two suspension shafts 32 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 as a whole, and can automatically clamp and tighten the rail 4.

[0044] On the contrary, when the staff pulls the handle frame 7 away from the side clamping plate 5 until the handle frame 7 passes the center point between the two suspension shafts 32 in the opposite direction, the handle frame 7 is in a free state, and the telescopic member 75 is fully unfolded and no longer provides thrust to the suspension shaft 32, so the clamp assembly 3 is in a loose state as a whole and can be easily unfolded, thereby achieving separation from the rail 4;

[0045] Further, a transverse plate 6 is provided on both the upper and lower sides of the handle frame 7, and the transverse plate 6 is fixedly connected to the side clamping plate 5. A positioning ball 62 is provided on the surface of the transverse plate 6 close to the handle frame 7, and a positioning groove 704 corresponding to the positioning ball 62 is provided on the surface of the handle frame 7. Figure 6 As shown, when the handle frame 7 is located at a designated position between the two horizontal plates 6, the positioning ball 62 can be stuck in the inner cavity of the positioning groove 704, thereby realizing the positioning of the handle frame 7 and preventing the handle frame 7 from easily shifting its position. Fig. 9As shown, the above-mentioned "specified position" refers to: after the handle frame 7 moves close to the side clamp plate 5 to the position beyond the center point between the two suspension shafts 32; in addition, guide grooves 61 are opened at both ends of the cross plate 6, and the suspension shaft 32 is movable through the guide groove 61 and slidably connected therewith. Since the suspension shaft 32 can only slide in the inner cavity of the guide groove 61, the X-shaped movable frame 31 can drive the two side clamp plates 5 to move away from or closer to each other when unfolding or folding, thereby realizing the clamping or separation of the side clamp plates 5 on the rails 4.

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

[0047] In order to connect the telescopic member 75 with the handle frame 7, the present application also has an inner sleeve 78 that is movable on the outer side of the connecting shaft 702, and an outer sleeve 79 that is movable on the outer side of the inner sleeve 78. The inner sleeve 78 and the outer sleeve 79 can both rotate independently, and 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 members 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 boss 781 and the outer sleeve 79 during rotation, and at the same time, the inner sleeve 78 and the outer sleeve 79 can be limited to avoid mutual displacement and separation between the two in the vertical direction. Figure 8 As shown, the two telescopic members 75 are symmetrically distributed on the left and right sides of the handle frame 7. When the handle frame 7 moves, the two telescopic members 75 can move simultaneously.

[0048] In order to connect the end of the telescopic member 75, the telescopic member 75 of the present application is a thrust spring, and the surface of the rotating sleeve 73, the surface of the boss 781 and the surface of the outer sleeve 79 are all fixed with a connecting platform 74, and the connecting platform 74 is inserted into the inner side of the end of the telescopic member 75 and fixedly connected thereto. The setting of the connecting platform 74 is mainly used to facilitate the fixed connection of the end of the telescopic member 75. In addition, as Figure 7 As shown, the rotation angle of the rotating sleeve 73 in the inner cavity of the mounting groove 72 will be limited by the connecting platform 74, so a notch 76 needs to be provided to increase the rotatable 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 the present 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] 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, limit sliding grooves 54 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 limit sliding block 71. The limit sliding block 71 is slidably installed in the inner cavity of the limit sliding groove 54 by means of the clamping groove 77. Combining Figure 7 and Figure 4 as shown, the length directions of the guiding sliding groove 61 and the limit sliding groove 54 are the same. The sliding connection between the limit sliding groove 54 and the limit sliding block 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] 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 finely adjust the position of the rail 4 along the length direction of the rail 4 when assembling the rail 4.

[0052] To install the positioning ball 62, this application also has a circular 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 circular hole, and the inner diameter of the opening 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. The elastic member 63 pushes the positioning ball 62 to be located at the opening end of the circular hole. When the positioning ball 62 is squeezed by the handle frame 7, it can be received into the inner cavity of the circular 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 opening end of the circular hole under the thrust of the elastic member 63, it will not脱离 the inner cavity of the circular hole.

[0053] In order to prevent the rail 4 and the clamp assembly 3 from easily moving relative to each other, the present application also has a positioning frame 8 fixedly connected to one end of the side clamp plate 5, the positioning frame 8 is an "L"-shaped angle steel, the middle of the positioning frame 8 is fixedly connected with a threaded sleeve, the inner cavity of the threaded sleeve is provided with an adjusting screw 81 through a threaded movement, 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, combined with Figure 4 and Fig.10 As shown, when the adjusting screw 81 rotates, it can push the wear-resistant block 83 to move closer to or away from the rail 4. When the wear-resistant block 83 fits against the side of the rail 4, the sliding friction between the two can position the rail 4, thereby preventing the clamp assembly 3 of the device and the rail 4 from easily moving relative to each other.

[0054] In order to facilitate the staff to control the position of the wear-resistant block 83, the present application also has vertical friction lines 831 on the surface of the wear-resistant block 83, which are used to increase the friction between the wear-resistant block 83 and the side of the rail 4. A connecting piece 84 is fixedly connected to the middle of the wear-resistant block 83. The connecting piece 84 is in a "T" shape and is rotatably installed inside one end of the adjusting screw 81. The other end of the adjusting screw 81 is fixedly connected to an adjusting knob 82. Therefore, the staff only needs to turn the adjusting knob 82 to control the wear-resistant block 83 to fit or move away from the rail 4.

[0055] In order to drive the X-shaped movable frame 31 to fold, the suspension shaft 32 of the present 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 installed on the top of the suspension shaft 32 through a support, and a protective cover is arranged on the outer side of the fixed pulley 311, such as Figure 3 As shown, the support at the bottom of the fixed pulley 311 can prevent the suspension shaft 32 and the X-shaped movable frame 31 from separating from each other. Two steel wire ropes 21 are fixedly arranged at the lower end of the steel cable 2. The steel wire ropes 21 are triangular and are sleeved on the outer sides of the two corresponding 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 approach each other, thereby driving the X-shaped movable frame 31 to fold, thereby realizing the clamping of the side clamp 5 on the rail 4.

[0056] The present invention also discloses a method for using the lifting sling for subway track laying, which specifically comprises the following steps:

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

[0058] Step 2: Place the unfolded clamp assembly 3 from top to bottom on the outside of the rail 4, push the handle frame 7 to move close to the side clamp plate 5 until the handle frame 7 passes the center point between the two suspension shafts 32, and the handle frame 7 is blocked by the side clamp plate 5 and cannot continue to move, the telescopic member 75 is in a compressed state, and the thrust generated by the telescopic member 75 on the suspension shaft 32 makes the two suspension shafts 32 move away from each other. At this time, the clamp assembly 3 is in a folded state as a whole, and the two side clamp plates 5 clamp the rail 4 from both sides respectively, and are acted on by the thrust of the telescopic member 75, so the clamp assembly 3 as a whole cannot be automatically unfolded at this time;

[0059] Step 3, reeling in the steel cable 2, the device lifts the rail 4, and after the rail 4 is suspended in the air, the tension generated by the steel wire rope 21 on the fixed pulley 311 drives the X-shaped movable frame 31 to always have a folding tendency, ensuring that the clamp assembly 3 holds the rail 4 stably.

[0060] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting device for subway track laying, comprising a gantry (1), a steel rail (4) is arranged below the gantry (1), and a clamp assembly (3) hoisted by a steel cable (2) is clamped on the steel rail (4), characterized in that: The clamp assembly (3) comprises a horizontally placed X-shaped movable frame (31), and four ends of the X-shaped movable frame (31) are each provided with a suspension shaft (32); Side clamping plates (5) are provided on both sides of the rail (4); a handle frame (7) is provided on the side of the side clamping plate (5) away from the rail (4); telescopic members (75) are provided on both sides of the handle frame (7); a rotating sleeve (73) is fixed at one end of the telescopic member (75); a limiting slider (71) is provided on the outer side of the rotating sleeve (73); a mounting groove (72) for placing the rotating sleeve (73) is provided in the middle of the limiting slider (71); a notch (76) is provided at one open end of the mounting groove (72); the limiting slider (71) and the rotating sleeve (73) are both rotatably sleeved in the middle of the corresponding suspension shaft (32); The handle frame (7) is provided with a transverse plate (6) on both upper and lower sides, and the transverse plate (6) is fixedly connected to the side clamping plate (5); a positioning ball (62) is provided on the surface of the transverse plate (6) close to the handle frame (7); a positioning groove (704) corresponding to the positioning ball (62) is provided on the surface of the handle frame (7); guide grooves (61) are provided at both ends of the transverse plate (6); and the suspension shaft (32) movably passes through the guide groove (61) and is slidably connected thereto.

2. A lifting device for subway track laying according to claim 1, characterized in that: The handle frame (7) comprises two upper and lower parallel connecting plates (701), the positioning groove (704) is provided on the surface of the connecting plate (701), a connecting shaft (702) and a column (703) are respectively fixedly connected between the two ends of the two connecting plates (701), and a notch parallel to the side clamping plate (5) is provided at one end of the connecting plate (701) close to the side clamping plate (5).

3. A lifting device for subway track laying according to claim 2, characterized in that: The outer movable sleeve of the connecting shaft (702) is provided with an inner sleeve (78), and the outer movable sleeve of the inner sleeve (78) is provided with an outer sleeve (79). 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 parts (75). A through groove (791) for the boss (781) to slide is provided on the surface of the outer sleeve (79).

4. A lifting device for subway track laying according to claim 3, characterized in that: The telescopic member (75) is a thrust spring. The surface of the rotating sleeve (73), the surface of the boss (781) and the surface of the outer sleeve (79) are all fixed with a connecting platform (74). The connecting platform (74) is inserted into the inner side of the end of the telescopic member (75) and fixedly connected thereto.

5. The lifting device for subway track laying according to claim 1, characterized in that: A sidewall (53) is provided in the middle of a side surface of the side clamp (5) away from the rail (4), the sidewall (53) corresponds to the handle frame (7), and the size of the sidewall (53) is smaller than the size of the handle frame (7), and both ends of the side surface of the side clamp (5) away from the rail (4) are provided with limit slide grooves (54), a clamping groove (77) is provided on the surface of the limit slide block (71), and the limit slide block (71) is slidably installed in the inner cavity of the limit slide groove (54) through the clamping groove (77).

6. A lifting device for subway track laying according to claim 5, characterized in that: The cross-section of the side clamping plate (5) is in a "卩" shape. A first roller (51) is rotatably installed on one side surface of the side clamping plate (5) close to the rail (4), and a second roller (52) is rotatably installed on the top surface of the side clamping plate (5). A circular hole is formed in one 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 circular hole, and the inner diameter of the opening 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 opening end of the circular hole.

7. The 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 through threads. 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).

8. The lifting device for subway track laying according to claim 7, 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). The other end of the adjusting screw rod (81) is fixedly connected with an adjusting knob (82).

9. The 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).

10. A method for using the lifting device for subway track laying according to claim 9, characterized in that: Specifically, it includes the following steps: Step 1: The staff member 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 elastic force, releasing the thrust 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 clamping plates (5) move away from each other. At this time, the fixture assembly (3) as a whole is in an unfolded state. Step 2: Place the unfolded 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 further. The telescopic member (75) is in a compressed state, and 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 fixture assembly (3) as a whole is in a folded state. The two side clamping plates (5) clamp the rail (4) from both sides respectively, and due to the thrust of the telescopic member (75), the fixture assembly (3) as a whole cannot automatically unfold at this time. Step 3, reeling in the steel cable (2), the device lifts the steel rail (4), after the steel rail (4) is suspended in the air, the tension generated by the steel 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 of the clamp assembly (3) on the steel rail (4) remains stable.

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