CN115492350A - Construction device for subway smoke-discharge-preventing pipeline - Google Patents

Abstract

The application discloses a construction device for subway smoke prevention and exhaust pipes, which includes a lifting mechanism, a platform assembly, two lifting mechanisms, and two lifting mechanisms; the platform assembly is arranged at the lifting end of the lifting mechanism; the two lifting Mechanisms are arranged at both ends of the platform assembly; two lifting mechanisms are arranged at both ends of the top surface of the platform assembly; Torsion spring; the lifting part is arranged on the top surface of the platform assembly, and the lifting end of the lifting part is fixedly connected to the limit plate; the hinge plate is fixedly connected to the side of the limit plate, and the two fixed rods The end is fixedly connected with the hinge plate; the storage plate is rotatably connected with the fixed rod; the torsion spring is sleeved on the outside of the fixed rod. The application realizes that a single person can complete the installation of the pipeline by carrying out the climbing operation, avoiding unbundling of the pipeline when it is lifted to the highest point, and reducing the risk factor of the workers.

Description

Construction device for subway smoke prevention and exhaust pipes

technical field

The present application relates to the technical field of smoke prevention and exhaust pipeline construction, in particular to a subway smoke prevention and exhaust pipeline construction device.

Background technique

The smoke prevention and exhaust system is the general term for the smoke prevention system and the smoke exhaust system. The smoke prevention system adopts the mechanical pressurized air supply method or the natural ventilation method to prevent the smoke from entering the evacuation channel; the smoke exhaust system adopts the mechanical smoke exhaust method or the natural ventilation method to exhaust the smoke to the outside of the building.

In subway stations, some spaces are relatively closed, so they have high requirements for the smoke control and exhaust system. During the construction of the smoke control and exhaust system, it is necessary to arrange smoke pipes. The smoke pipes are usually hoisted on the top. The lifting equipment is assisted, and at least two people are required to carry out climbing operations, which increases the risk, uses more equipment, increases construction costs and labor costs, and has low installation efficiency.

Contents of the invention

This application provides a construction device for subway smoke prevention and exhaust pipes, which solves the problem that in the prior art, when installing smoke prevention and exhaust pipes in subway stations, it needs to be assisted by hoisting equipment, and at least two people are required to perform climbing operations, which increases the risk. The technical problems of low safety and construction cost and low overall installation efficiency have realized that a single person can complete the installation of the pipeline by performing climbing operations. The pipeline is finally lifted to the designated position through two lifting actions, and the connection between the two lifting actions of the pipeline is achieved. It is smooth, and the pipeline is unbundled when the two lifting actions are connected, which prevents the unbundling of the pipeline when it is lifted to the highest point, and reduces the risk factor of workers.

A construction device for smoke prevention and exhaust pipes for subways provided by the application includes a lifting mechanism, a platform component, two lifting mechanisms and two lifting mechanisms; the platform component is arranged at the lifting end of the lifting mechanism, and can The lifting mechanism is driven by the lifting mechanism; the two lifting mechanisms are respectively arranged at both ends of the platform assembly, and the lifting ends of the lifting mechanisms can be detachably connected with the pipeline; the two lifting mechanisms are respectively arranged at the two ends of the platform assembly. Both ends of the top surface of the platform assembly; the lifting mechanism includes a lifting part, a limit plate, a hinge plate, a storage plate, a fixed rod and a torsion spring; the lifting part is arranged on the top surface of the platform component, and the The lifting end of the lifting part is fixedly connected with the limit plate; the hinge plate is fixedly connected to the side of the limit plate, and the hinge plate is provided with a through groove; the fixed rod is in the through groove , and the two ends of the fixed rod are fixedly connected with the hinge plate; the storage plate is placed on the top surface of the limit plate, and the storage plate is connected to the fixed rod in rotation; the torsion spring It is sheathed on the outside of the fixed rod, and the two ends of the torsion spring are clamped to the side surfaces of the hinge plate and the storage plate respectively.

In a possible implementation manner, the lifting mechanism includes a fixed base, a telescopic part, a sliding seat and a plurality of lifting rod assemblies; the body of the telescopic part is fixedly connected to the side of the fixed base, and the body of the telescopic part The output end is slidingly connected to the side of the fixed base; the sliding seat is fixedly connected to the bottom surface of the platform assembly; the lifting rod assembly includes a first lifting arm and a second lifting arm arranged crosswise, the first lifting arm A lifting arm is rotationally connected with the second lifting arm; the bottom end of the first lifting arm at the bottom is rotationally connected with the output end of the telescopic part, and the second lifting arm at the bottom The bottom end of the lifting arm is rotatably connected to the fixed base, the top end of the first lifting arm above is rotatably connected to the bottom surface of the platform assembly, and the top end of the second lifting arm above is connected to the bottom surface of the platform assembly. The sliding seat is rotatably connected to the sliding seat and can be slidably connected to the sliding seat; the upper and lower adjacent ends of the first lifting arm and the end of the second lifting arm are rotatably connected.

In a possible implementation manner, a first chute and a second chute are respectively provided on the fixed base and the sliding seat; the output end of the telescopic part is in the first chute, and The first chute is slidably connected; the top end of the upper second lifting arm is in the second chute and is slidably connected with the second chute.

In a possible implementation manner, the platform assembly includes a working platform and two first supporting columns; the bottom ends of the two first supporting columns are respectively fixedly connected to the top surface of the front end of the working platform; The two lifting mechanisms are respectively arranged on the top ends of the two first support columns; the bottom surface of the working platform is connected to the lifting end of the lifting mechanism, and the lifting mechanism is arranged on the top surface of the working platform.

In a possible implementation manner, the lifting mechanism includes a U-shaped fixed frame, a winding wheel, a rope and a motor; the U-shaped fixed frame is fixedly connected to the top of the first support column; the winding The wheel is rotatably connected in the U-shaped fixed frame, and the binding rope is wound on the outside of the reel; the body of the motor is fixedly connected with the U-shaped fixed frame, and the output end of the motor is connected to the The central fixed connection of the reel described above.

In a possible implementation manner, the limiting plate is arranged obliquely, and the angle between the bottom surface of the limiting plate and the horizontal plane is 0°<α≤5°.

In a possible implementation, the construction device for smoke prevention and exhaust pipes for subways provided by the application further includes a stop mechanism; the stop mechanism includes a fixed block, a threaded rod, a shaking turntable and a rubber pad; the fixed block fixedly connected to the outside of the fixed base; the threaded rod passes through the fixed block and is threadedly connected with the fixed block; the top end of the threaded rod is provided with the shaking turntable, and the bottom end of the threaded rod is provided with The rubber pad.

In a possible implementation manner, the subway smoke prevention and exhaust pipeline construction device provided by the present application further includes universal wheels, and the universal wheels are arranged on the bottom surface of the fixed base.

In a possible implementation manner, the platform assembly further includes two second support columns; the two second support columns are fixedly connected to the top surface of the rear end of the working platform; the two second support columns Protective nets are provided between the columns, between the first support column and the second support column.

One or more technical solutions provided in this application have at least the following technical effects or advantages:

This application adopts a lifting mechanism, a platform component, two lifting mechanisms and two lifting mechanisms; the platform component is arranged at the lifting end of the lifting mechanism, and can perform lifting movement under the drive of the lifting mechanism; the two lifting mechanisms are respectively arranged on the platform component Both ends of the lifting mechanism, and the lifting end of the lifting mechanism can be detachably connected to the pipeline; during construction, the worker stands on the platform assembly, and the worker and the lifting mechanism are first raised to a certain height through the lifting mechanism, and then the workers on the ground tie the pipeline. At the lifting end of the lifting mechanism, the lifting mechanism is controlled to drive the pipeline to rise from the ground;

Then two lifting mechanisms are respectively arranged on the two ends of the top surface of the platform assembly; the lifting mechanism is set to include a lifting part, a limit plate, a hinge plate, a storage plate, a fixed rod and a torsion spring; the pipeline is driven by the lifting mechanism to rise During the process, when the pipeline rises to the height of the storage plate, the storage plate is squeezed, so that the storage plate is turned up relative to the fixed rod, and a certain torque is generated on the torsion spring. When the pipe continues to rise and leaves the storage plate, the storage plate is twisted Under the action of the spring, it is flipped downwards, so that the bottom surface of the storage board is clamped on the limit plate, and then the lifting mechanism is controlled to drive the pipeline down, and the pipeline is placed on the storage board. At this time, the workers on the platform assembly can easily Disassemble the pipeline from the lifting end of the lifting mechanism in a timely manner, so that the pipeline is unbundled in advance. Then, control the movement of the lifting part to drive the limit plate and the storage plate to move up as a whole, thereby driving the unbundled pipeline to continue to lift, and finally lift to Subsequent installation at the specified height avoids the unbundling of the pipes in the prior art when they are hoisted to the highest point (designated installation position), increases the risk factor of workers' construction, and effectively solves the problem of the installation of subway stations in the prior art. The smoke exhaust pipe needs to be assisted by hoisting equipment, and at least two people are required to carry out the climbing operation, which increases the risk and construction cost, and the overall installation efficiency is low. The technical problem is that the pipe can be installed by a single person performing the climbing operation Completed, the pipeline is finally lifted to the designated position through two lifting actions. The connection between the two lifting actions of the pipeline is smooth, and the pipeline is unbound when the two lifting actions are connected to avoid unbundling when the pipeline is lifted to the highest point. Reduce the risk factor of workers.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments of the present invention or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the front structural schematic diagram of a kind of subway smoke prevention and exhaust pipeline construction device provided by the embodiment of the application;

Fig. 2 is an axonometric view of the lifting mechanism provided by the embodiment of the present application after the lifting part is removed;

Fig. 3 is the axonometric view after removing the storage plate and the torsion spring in Fig. 2;

Fig. 4 is a partial enlarged view of area A in Fig. 1;

Figure 5 is an axonometric view of the platform assembly provided by the embodiment of the present application;

Fig. 6 is a front view of the limiting plate provided by the embodiment of the present application.

Reference signs: 1-lifting mechanism; 11-fixed base; 111-first chute; 12-telescopic part; 13-sliding seat; 131-second chute; 14-lifting rod assembly; 141-first lifting Arm; 142-second lifting arm; 2-platform assembly; 21-working platform; 22-first support column; 23-second support column; 24-protective net; 3-lifting mechanism; 31-U-shaped fixed frame ;32-winding wheel; 33-tie rope; 34-motor; 4-lift mechanism; 41-lift part; 42-limit plate; 43-hinge plate; 431-through slot; Rod; 46-torsion spring; 5-pipeline; 6-stop mechanism; 61-fixed block; 62-threaded rod; 63-shake turntable; 64-rubber pad;

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer " and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore are not to be construed as limitations of the invention. The terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance. In addition, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be It can be directly connected, or indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention according to specific situations.

Referring to Figures 1-3, a subway smoke prevention and exhaust pipeline construction device provided by the embodiment of the present application includes a lifting mechanism 1, a platform assembly 2, two lifting mechanisms 3 and two lifting mechanisms 4; the platform assembly 2 is arranged on the lifting mechanism The lifting end of 1 can be lifted and lowered by the lifting mechanism 1; two lifting mechanisms 3 are respectively arranged at both ends of the platform assembly 2, and the lifting ends of the lifting mechanism 3 can be detachably connected with the pipeline 5; the two lifting mechanisms Mechanism 4 is respectively arranged on the two ends of the top surface of platform assembly 2; Lifting mechanism 4 includes lifting part 41, limit plate 42, hinge plate 43, storage plate 44, fixed rod 45 and torsion spring 46; Lifting part 41 is arranged on the platform The top surface of the assembly 2, and the lifting end of the lifting part 41 is fixedly connected to the limit plate 42; the hinge plate 43 is fixedly connected to the side of the limit plate 42, and the hinge plate 43 is provided with a through groove 431; the fixed rod 45 is in the through groove 431, and the two ends of the fixed rod 45 are fixedly connected with the hinge plate 43; the object plate 44 is placed on the top surface of the limit plate 42, and the object plate 44 is connected with the fixed rod 45 in rotation; the torsion spring 46 is sleeved on the fixed rod 45 and the two ends of the torsion spring 46 are engaged with the side surfaces of the hinge plate 43 and the storage plate 44 respectively. In the embodiment of the present application, the lifting mechanism 3 and the lifting mechanism 4 successively lift the pipeline 5 twice, so that the pipeline 5 finally reaches the specified height for installation, and when the pipeline 5 is transferred from the lifting mechanism 3 to the lifting mechanism 4, Since the pipeline 5 has not reached the highest point (designated installation height), the pipeline 5 can be unbundled when it is transferred to the lifting mechanism 4 (releasing the connection and binding between the lifting mechanism 3), and then the pipeline 5 passes through the lifting mechanism 4. The storage plate 44 is lifted as a whole, avoiding the unbinding of the pipeline 5 in the prior art when it is hoisted to the highest point (designated installation height), which increases the risk factor of worker construction; in actual construction, first, a worker Standing on the platform assembly 2, the worker and the lifting mechanism 4 are first raised to a certain height through the lifting mechanism 1, and then the worker on the ground binds the pipeline 5 to the lifting end of the lifting mechanism 3, and drives the pipeline 5 from When the ground rises, when the pipeline 5 rises to the height of the storage plate 44, the storage plate 44 is squeezed, so that the storage plate 44 is turned up relative to the fixed rod 45, and a certain torque is generated to the torsion spring 46 at the same time. When the pipeline 5 continues to rise and leaves the storage After the plate 44, the storage plate 44 is turned downwards under the action of the torsion spring 46, so that the bottom surface of the storage plate 44 is clamped on the limit plate 42, and then the lifting mechanism 3 is controlled to drive the pipeline 5 to descend, and the pipeline 5 is placed on the storage space. At this time, the workers on the platform assembly 2 can easily disassemble the pipeline 5 from the lifting end of the lifting mechanism 3, so that the pipeline 5 is untied in advance, and then control the lifting part 41 to drive the limit plate 42. The storage plate 44 is moved up as a whole, thereby driving the unbundled pipe 5 to continue to lift, and finally lift to a specified height for subsequent installation.

With reference to Fig. 1, lifting mechanism 1 comprises fixed base 11, telescopic part 12, slide seat 13 and a plurality of elevating rod assembly 14; The side sliding connection of 11; Slide seat 13 is fixedly connected to the bottom surface of platform assembly 2; The lifting arms 142 are rotatably connected; the bottom end of the first lifting arm 141 below is rotatably connected to the output end of the telescopic part 12, and the bottom end of the second lifting arm 142 below is rotatably connected to the fixed base 11. The top of the first lifting arm 141 above is rotatably connected to the bottom surface of the platform assembly 2, and the top of the second lifting arm 142 above is rotatably connected to the sliding seat 13 and can be slidably connected to the sliding seat 13 at the same time; The ends of the first lifting arm 141 and the second lifting arm 142 are rotatably connected. In the embodiment of the present application, the telescopic part 12 is a hydraulic cylinder, which is obliquely arranged on the side of the fixed base 11. The telescopic end of the hydraulic cylinder is provided with a connecting rod, which is slidingly connected to the side of the fixed base 11. The bottom ends of the first lifting arm 141 below are hinged. According to actual needs, select a suitable number of lifting rod assemblies 14, and stack the lifting rod assemblies 14; The bottom end of the lower first lifting arm 141 moves toward the telescopic portion 12, so that the platform assembly 2 moves up as a whole through the cooperation of the first lifting arm 141, the second lifting arm 142 and the sliding seat 13. , so that the worker and the lifting mechanism 4 can be raised to a certain height as a whole.

Referring to Figure 1, the fixed base 11 and the sliding seat 13 are provided with a first chute 111 and a second chute 131 respectively; The top of the second lifting arm 142 at the top is in the second sliding slot 131 and is slidably connected with the second sliding slot 131 ; In the embodiment of the present application, the connecting rod provided at the output end of the telescopic part 12 can be inserted into the first chute 111 to realize the sliding connection between the output end of the telescopic part 12 and the fixed base 11. The second lifting arm above The top end of 142 is rotatably provided with the same connecting rod and is also inserted in the second sliding groove 131 , thereby realizing the sliding connection between the top end of the second lifting arm 142 above and the sliding seat 13 .

1 and 5, the platform assembly 2 includes a working platform 21 and two first supporting columns 22; the bottom ends of the two first supporting columns 22 are respectively fixedly connected to the top surface of the front end of the working platform 21; two lifting mechanisms 3 They are arranged on the tops of the two first supporting columns 22 respectively; the bottom surface of the working platform 21 is connected with the lifting end of the lifting mechanism 1 , and the top surface of the working platform 21 is provided with a lifting mechanism 4 . In the embodiment of the present application, the working platform 21 is used for lifting workers. In actual installation, the bottom surface of the working platform 21 is fixedly connected to the sliding seat 13, and the bottom surface of the working platform 21 is hinged to the top of the first lifting arm 141 above.

With reference to Fig. 4, lifting mechanism 3 comprises U-shaped fixed frame 31, reel 32, binding rope 33 and motor 34; U-shaped fixed frame 31 is fixedly connected to the top of first support column 22; Shaped holder 31, and binding rope 33 is wound on the outside of reel 32; In the embodiment of the present application, when the pipeline 5 is lifted, the pipeline 5 is firstly bound on the ground by the binding rope 33, and then the motor 34 is controlled to rotate to drive the reel 32 to rotate, so that the binding rope 33 is wound on the reel 32 , so that the pipeline 5 is gradually lifted. When the pipeline 5 is lifted and passes through the storage plate 44 to reach the top of the storage plate 44, the control motor 34 is reversed, so that the pipeline 5 is lowered to the top of the storage plate 44. At this time, it is on the working platform 21 The worker releases the binding rope 33 on the pipeline 5, so as to continue to lift the pipeline 5 again through the lifting mechanism 4; The telescopic part 12, the motor 34 and the lifting part 41 operate.

Referring to FIG. 6 , the limiting plate 42 is arranged obliquely, and the angle between the bottom surface of the limiting plate 42 and the horizontal plane is 0°<α≦5°. In the embodiment of the present application, the limiting plate 42 is further inclined, so that after the pipe 5 is unbound from the binding rope 33, it can be prevented from slipping during the lifting process driven by the storage plate 44, thereby further ensuring the safety of construction.

With reference to Fig. 1, a kind of subway anti-exhaust pipeline construction device provided by the embodiment of the present application also includes stop mechanism 6; Fixedly connected to the outside of the fixed base 11; the threaded rod 62 passes through the fixed block 61 and is threadedly connected with the fixed block 61; In the embodiment of the present application, by setting the stop mechanism 6, the device can provide stable support during use, and avoid the danger caused by the movement of the device. In actual use, after the device is moved to the construction position, the threaded rod 62 Move down and make the rubber pad 64 fit closely with the ground.

Referring to FIG. 1 , a subway smoke prevention and exhaust pipeline construction device provided by an embodiment of the present application further includes a universal wheel 7 , which is arranged on the bottom surface of a fixed base 11 . In the embodiment of the present application, universal wheels 7 are provided to facilitate the movement of the whole device.

Referring to Fig. 5, the platform assembly 2 also includes two second support columns 23; the two second support columns 23 are fixedly connected to the top surface of the rear end of the working platform 21; between the two second support columns 23, the first support column 22 and the second support column 23 are provided with protective nets 24 . In the embodiment of the present application, a second support column 23 and a protective net 24 are further provided to ensure the safety of workers during construction on the working platform 21 .

The working principle of a subway smoke prevention and exhaust pipeline construction device provided in the embodiment of the present application is as follows:

When using the device, after moving the device to the construction position, by rotating and shaking the turntable 63, the threaded rod 62 is moved down and the rubber pad 64 is closely attached to the ground. A worker stands on the working platform 21, and through the controller 8 Control the retraction of the telescopic part 12, and through the cooperation of the first lifting arm 141, the second lifting arm 142 and the sliding seat 13, the working platform 21 is raised to a suitable height, and the workers on the ground tie the pipeline 5 On the binding rope 33, start two motors 34 by controller 8, make two motors 34 synchronously control, drive reel 32 to rotate, the binding rope 33 is wound, and pipeline 5 is risen, and in pipeline 5 rising process will be Turn the storage plate 44 up and turn it over. After the pipe 5 exceeds the storage plate 44, the storage plate 44 returns to the original inclined state under the action of the torsion spring 46, and then controls the two motors 34 to reverse, and the pipeline 5 is placed on the storage plate 44 , and the worker on the working platform 21 releases the binding rope 33 on the pipeline 5, and then controls the lifting part 41 to start synchronously through the controller 8, and the lifting part 41 drives the limit plate 42, the hinge plate 43 and the storage plate 44 to move up as a whole , lift the pipe 5 to the specified installation height and stop, and the workers can fix and install the pipe 5 with the bracket.

The various implementations in this specification are described in a progressive manner, the same or similar parts of the various implementations can be referred to each other, and each implementation focuses on the differences from other implementations.

The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications to the technical solutions, or equivalent replacement of some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the present application.

Claims (9)

1. A kind of subway smoke-proof pipeline construction device is characterized in that, comprises elevating mechanism (1), platform assembly (2), two elevating mechanisms (3) and two elevating mechanisms (4); The platform assembly (2) is arranged at the lifting end of the lifting mechanism (1), and can perform lifting movement driven by the lifting mechanism (1); The two lifting mechanisms (3) are respectively arranged at both ends of the platform assembly (2), and the lifting ends of the lifting mechanisms (3) can be detachably connected to the pipeline (5); The two lifting mechanisms (4) are respectively arranged at both ends of the top surface of the platform assembly (2); The lifting mechanism (4) includes a lifting part (41), a limit plate (42), a hinge plate (43), a storage plate (44), a fixed rod (45) and a torsion spring (46); The lifting part (41) is arranged on the top surface of the platform assembly (2), and the lifting end of the lifting part (41) is fixedly connected with the limiting plate (42); The hinged plate (43) is fixedly connected to the side of the limiting plate (42), and the hinged plate (43) is provided with a through groove (431); The fixed rod (45) is located in the through groove (431), and both ends of the fixed rod (45) are fixedly connected to the hinge plate (43); The storage plate (44) is placed on the top surface of the limiting plate (42), and the storage plate (44) is rotatably connected to the fixed rod (45); The torsion spring (46) is sheathed on the outside of the fixed rod (45), and the two ends of the torsion spring (46) are respectively clamped to the hinge plate (43) and the storage plate (44) side. 2. The subway smoke prevention and exhaust pipeline construction device according to claim 1, characterized in that, the lifting mechanism (1) includes a fixed base (11), a telescopic part (12), a sliding seat (13) and a plurality of lifting rod assembly (14); The body of the telescopic part (12) is fixedly connected to the side of the fixed base (11), and the output end of the telescopic part (12) is slidably connected to the side of the fixed base (11); The sliding seat (13) is fixedly connected to the bottom surface of the platform assembly (2); The lifting rod assembly (14) includes a first lifting arm (141) and a second lifting arm (142) arranged crosswise, and the first lifting arm (141) and the second lifting arm (142) ) Rotation connection between; The bottom end of the first lifting arm (141) at the bottom is rotationally connected with the output end of the telescopic part (12), and the bottom end of the second lifting arm (142) at the bottom is connected with the output end of the telescopic part (12). The fixed base (11) is rotatably connected, the top of the first lifting arm (141) above is rotatably connected to the bottom surface of the platform assembly (2), and the second lifting arm (142) above is The top of the top is rotatably connected with the sliding seat (13) and can be slidably connected with the sliding seat (13); The ends of the first lifting arm (141) and the second lifting arm (142) adjacent up and down are rotationally connected. 3. The subway smoke prevention and exhaust pipe construction device according to claim 2, characterized in that, the fixed base (11) and the sliding seat (13) are respectively provided with a first chute (111) and a second Chute (131); The output end of the telescopic part (12) is in the first chute (111), and is slidably connected with the first chute (111); The top end of the upper second lifting arm (142) is in the second sliding slot (131), and is slidably connected with the second sliding slot (131). 4. The subway smoke prevention and exhaust pipeline construction device according to claim 1, characterized in that, said platform assembly (2) comprises a working platform (21) and two first support columns (22); The bottom ends of the two first support columns (22) are respectively fixedly connected to the top surface of the front end of the working platform (21); The two lifting mechanisms (3) are respectively arranged on the top ends of the two first support columns (22); The bottom surface of the working platform (21) is connected to the lifting end of the lifting mechanism (1), and the lifting mechanism (4) is arranged on the top surface of the working platform (21). 5. The subway smoke prevention and exhaust pipeline construction device according to claim 4, characterized in that, the lifting mechanism (3) comprises a U-shaped fixed frame (31), a winding wheel (32), a binding rope (33) and Motor (34); The U-shaped fixing bracket (31) is fixedly connected to the top of the first support column (22); The reel (32) is rotatably connected in the U-shaped fixed frame (31), and the binding rope (33) is wound on the outside of the reel (32); The body of the motor (34) is fixedly connected to the U-shaped fixing frame (31), and the output end of the motor (34) is fixedly connected to the center of the winding wheel (32). 6. The subway smoke prevention and exhaust pipeline construction device according to claim 1, characterized in that, the limiting plate (42) is arranged obliquely, and the angle between the bottom surface of the limiting plate (42) and the horizontal plane is 0 °<α≤5°. 7. The subway smoke prevention and exhaust pipe construction device according to claim 2, further comprising a stop mechanism (6); The stop mechanism (6) includes a fixed block (61), a threaded rod (62), a shaking turntable (63) and a rubber pad (64); The fixed block (61) is fixedly connected to the outside of the fixed base (11); The threaded rod (62) passes through the fixed block (61) and is threadedly connected with the fixed block (61); The top end of the threaded rod (62) is provided with the shaking turntable (63), and the bottom end of the threaded rod (62) is provided with the rubber pad (64). 8. The subway smoke prevention and exhaust pipeline construction device according to claim 2, characterized in that it further comprises a universal wheel (7), and the universal wheel (7) is arranged on the bottom surface of the fixed base (11). 9. The subway smoke prevention and exhaust pipeline construction device according to claim 4, characterized in that, the platform assembly (2) also includes two second support columns (23); The two second support columns (23) are fixedly connected to the top surface of the rear end of the working platform (21); A protective net (24) is arranged between the two second support columns (23), and between the first support column (22) and the second support column (23).

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