Hoisting device for mounting steel bar truss floor support plate

Abstract

The invention relates to the technical field of hoisting equipment, in particular to a hoisting device for mounting a steel bar truss floor support plate, which comprises a support frame, the support frame is cross-shaped, four sections of the support frame are respectively provided with a pneumatic buffer unit, and the end part of each pneumatic buffer unit is provided with a hoisting belt and a hoisting hook. The hoisting device for mounting the steel bar truss floor support plate adopts a pneumatic buffering mode, gas has recoverability and mechanical fatigue-free characteristics, and the hoisting device is simple in structure, convenient to use, high in safety and high in reliability, and can be used for mounting the steel bar truss floor support plate in a hoisting process. The hoisting device is simple in structure and convenient to operate, and a pipeline connecting piece is arranged between the two pneumatic buffering units arranged in the length direction of the floor support plate. The stable buffering performance can still be kept after long-term use, and the problems that a metal material is fatigued, the elastic coefficient is reduced and the buffering performance is degraded due to repeated compression of a traditional spring are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting equipment, and particularly to a hoisting device for installing a steel bar truss floor slab. Background Art

[0002] A steel bar truss is a steel bar skeleton composed of three groups of steel bars: upper chord steel bars, web bar steel bars, and lower chord steel bars. This skeleton is formed by welding the upper chord steel bars and the lower chord steel bars together with two bent web bar steel bars to form a triangular cross-section. Along the width direction of the steel bar truss floor slab, the web bar steel bars are continuously arranged in a wavy shape. The steel bar truss floor slab is a combined formwork in which the steel bar truss is welded to a galvanized profiled steel sheet bottom form. During the construction stage, the steel bar truss floor slab can bear the construction load, be directly laid on the beam, and concrete can be poured after a simple steel bar project. The formwork erection and disassembly works are reduced during the construction process, greatly improving the construction efficiency of the floor slab.

[0003] Chinese Patent: CN202410891037.1 proposes a hoisting tool for a steel bar truss floor slab, including a first cross frame and a second cross frame. A cross-shaped structure is fixedly installed between the first cross frame and the second cross frame from bottom to top. The first cross frame and the second cross frame have the same structure, and a hoisting mechanism is installed inside both of them. The hoisting mechanism includes two moving blocks slidably installed inside the first cross frame. On the outer surfaces of the two moving blocks close to each other, two fixing plates are fixedly installed respectively. A winding roller is rotatably installed between the two fixing plates, and a cable is wound around the outer surface of the winding roller. Through the movably installed moving blocks and buffer springs, the moving blocks can move along with the cable when the cable is tightened, buffering the pulling force to a certain extent, so as to avoid the impact force at the moment of hoisting from affecting the structural stability of the steel bar truss floor slab.

[0004] It buffers the impact force when the cable is tightened by setting springs, and can also judge whether the floor slab is leveled during hoisting according to the degree of compression of the springs by the sliders. However, in actual use, since the springs will generate fatigue after multiple uses, and the positions of the lifting tools and the floor slab are different each time during hoisting. For example, one side is heavier on the left in one hoisting and the other side is heavier on the right in another hoisting. After multiple uses, the fatigue degrees of the springs on both sides will also be different, resulting in an increase in the displacement amount of the moving blocks or inconsistent responses under the same pulling force, thereby destroying the corresponding relationship between the displacement difference and the actual pulling force. For example, if the left spring becomes fatigued and soft, the displacement amount of the left moving block is greater than that of the right under the same pulling force, and the system misjudges that "the left side is more stressed", triggering an incorrect leveling action, which has an adverse impact on hoisting.

[0005] Therefore, we propose a hoisting device for installing a steel bar truss floor slab. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, an embodiment of the present application provides a lifting device for installing a steel truss floor deck, including a support frame, which is cross-shaped, and the four sections of the support frame are each provided with a pneumatic buffer unit, and the ends of the pneumatic buffer units are each provided with a sling and a hook, and a pipe connector is provided between two pneumatic buffer units arranged along the length direction of the floor deck, and an air pump is provided at the bottom of the support frame, and the air pump is connected to the pipe connector.

[0007] In some embodiments, a mounting frame is fixedly provided on the support frame, and the pneumatic buffer unit includes a cylinder sleeve arranged in the mounting frame, a piston is slidably provided in the cylinder sleeve, a moving rod is provided on the piston, and the end of the moving rod passes through the cylinder sleeve. A detection part for detecting the internal air pressure is provided in the cylinder sleeve, one end of the sling is connected to the end of the moving rod, and the other end is connected to the hook, a guide part is provided on the mounting frame, and the sling extends from the end of the moving rod, bypasses the guide part and is connected to the hook.

[0008] In some embodiments, the guide member includes a rotating shaft rotatably disposed in the installation frame, a guide wheel is disposed on the outer side of the rotating shaft, and a wire groove is opened on the outer side of the guide wheel.

[0009] In some embodiments, the detection element is an air pressure sensor.

[0010] In some embodiments, a mounting frame is fixedly provided on the outside of the cylinder sleeve, side panels are provided on both sides of the mounting frame, screw holes are provided on the side panels and on both sides of the mounting frame, and the two are fixedly connected by bolts.

[0011] In some embodiments, the pipeline connector includes two connecting pipes, the bottom ends of the two connecting pipes are respectively connected to the air inlet and the air outlet of the air pump, and the top ends of the two connecting pipes are respectively connected to the cylinder sleeves on both sides, and the cylinder sleeve is provided with a joint at one end close to the connecting pipe, and a valve body is provided in the joint, and the outer sides of the bottom ends of the two connecting pipes are provided with branch pipes connected to the outside world, and the branch pipes are provided with electric control valves, so that the port of the air pump is connected to the outside world through the branch pipe or connected to the cylinder sleeve through the connecting pipe.

[0012] In some embodiments, the valve body includes a fixed ring fixedly arranged in the joint, a movable plug is slidably arranged in the joint, the outer diameter of the movable plug is the same as the inner diameter of the fixed ring, an ear plate is arranged on the outside of the movable plug, a guide rod is fixedly arranged on the ear plate, the guide rod slides through the fixed ring, a return spring is arranged on the outside of the guide rod, both ends of the return spring are respectively connected to the ear plate and the fixed ring, an electromagnet is arranged inside the pipe mouth of the connecting pipe close to the joint, the end of the movable plug close to the electromagnet is made of magnetic material, and when the electromagnet is energized, it attracts the movable plug to make it separate from the fixed ring.

[0013] In some embodiments, a lifting ring is fixedly provided on one side of the mounting frame close to the end of the support frame.

[0014] In some embodiments, adjustment pipes are fixedly installed on the outer sides of the mounting frames arranged along the length direction of the floor slab formwork. The adjustment pipes are Z-shaped, and their two ends are respectively connected to the mounting frames on both sides. The adjustment pipes are tubular with openings at both ends, and the middle part thereof is communicated with a connecting pipe. An electric control valve is arranged between the adjustment pipe and the connecting pipe. There are two adjustment pipes which are respectively located on both sides of the mounting frame.

[0015] In some embodiments, the diameters of the openings at both ends of the adjustment pipe are smaller than the diameter of its main body.

[0016] The present invention has at least the following beneficial effects: Stable buffering performance: The pneumatic buffering method is adopted. The gas has recoverability and no mechanical fatigue characteristics, and can still maintain stable buffering performance after long-term use, avoiding the problems of metal material fatigue, decrease in elastic coefficient and degradation of buffering performance caused by repeated compression of traditional springs. Automatic horizontal adjustment: When the weights on both sides of the floor slab formwork in the length direction are uneven due to human error, the air pump can adjust the air pressure inside the pneumatic buffering unit, drive the sling and the hook to move through the moving rod, and adjust the floor slab formwork to a horizontal state, compensating for human operation errors and improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the present invention in another orientation; Figure 3 is a schematic diagram of the partial side view structure of the present invention; Figure 4 is a schematic diagram of the structure of the pneumatic buffering unit of the present invention; Figure 5 is of the present invention Figure 4 partial structure schematic diagram; Figure 6 is a schematic diagram of the internal structure of the cylinder sleeve of the present invention; Figure 7 is a schematic diagram of the structure at the air pump of the present invention; Figure 8 is a schematic diagram of the internal structure of the joint of the present invention; Figure 9 is a schematic diagram of the overall structure in Embodiment 2 of the present invention; Figure 10 is of the present invention Figure 9 partial structure schematic diagram; Figure 11 is a schematic diagram of the structure of the adjustment pipe of the present invention.

[0018] In the figure: 1, support frame; 2, pneumatic buffer unit; 21, cylinder liner; 22, piston; 23, moving rod; 24, detecting piece; 25, guiding piece; 251, rotating shaft; 252, guiding wheel; 3, sling; 4, hook; 5, pipe connector; 51, connecting pipe; 52, joint; 53, valve body; 531, fixed ring; 532, moving plug; 533, ear plate; 534, guiding rod; 535, return spring; 536, electromagnet; 54, branch pipe; 6, air pump; 7, mounting frame; 8, mounting bracket; 9, side plate; 10, lifting ring; 11, adjusting pipe. Specific implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: Please refer to Figures 1 - 8 , the present invention provides a technical solution: a hoisting device for installing a steel bar truss floor slab, including a support frame 1. The support frame 1 is cross-shaped, and pneumatic buffer units 2 are arranged at four sections of the support frame 1. Sling 3 and hook 4 are arranged at the ends of the pneumatic buffer units 2. The four pneumatic buffer units 2 on the cross-shaped support frame 1 lift the floor slab by connecting with the sling 3 and the hook 4. A pipe connector 5 is arranged between the two pneumatic buffer units 2 arranged along the length direction of the floor slab. An air pump 6 is arranged at the bottom of the support frame 1. The air pump 6 is connected to the pipe connector 5. The air pump 6 can adjust the air pressure inside the pneumatic buffer unit 2 through the pipe connector 5, thereby adjusting its extension length, and can buffer the impact force generated when just lifted by means of pneumatic buffering, so as to avoid rigid impact on the floor slab.

[0021] In the prior art, a spring is generally used as a buffer part. However, after the traditional spring is repeatedly compressed, the metal material will undergo fatigue, resulting in a decrease in the elastic coefficient and a gradual degradation of the buffer performance. In this application, a pneumatic method is adopted. The gas has recoverability and no mechanical fatigue characteristics, and can still maintain stable buffer performance after long-term use.

[0022] During hoisting, the hook 4 is connected to the steel bars on the floor formwork. When hoisting, the impact force generated at the moment of hoisting will be absorbed by the pneumatic buffer unit 2, providing a good buffering effect. And if the weights on both sides are uneven due to human error, it should be noted that the floor formwork is generally structured with a smaller width and a longer length. Therefore, during hoisting, there is generally no uneven situation on both sides along the width direction. Generally, this kind of situation occurs in the length direction. Because of its long length, it is not easy to accurately judge the center point, so there will be an uneven distribution on both sides. When there is an uneven distribution along the length direction, the hooks 4 on both sides are under uneven stress. This is reflected in the pneumatic buffer unit 2 as a change in the internal air pressure and the internal air pressures of the pneumatic buffer units 2 on both sides are inconsistent. At this time, the air pump 6 starts to adjust the internal air pressure of the pneumatic buffer unit 2, and then drives the sling 3 to move through the pneumatic buffer unit 2, adjusting the floor formwork to be horizontal.

[0023] An installation frame 7 is fixedly arranged on the support frame 1. The pneumatic buffer unit 2 includes a cylinder sleeve 21 arranged in the installation frame 7. A piston 22 is slidably arranged in the cylinder sleeve 21. A moving rod 23 is arranged on the piston 22. The initial position of the piston 22 is at a certain distance from the bottom of the cylinder sleeve 21, which forms a cavity between the piston 22 and the cylinder sleeve 21. The cavity is filled with air. In the initial state, the amount of air in the cylinder sleeves 21 on both sides is the same. In terms of air pressure, the air pressures in the cylinder sleeves 21 on both sides are the same in the initial state. The end of the moving rod 23 penetrates through the cylinder sleeve 21. A detection piece 24 for detecting the internal air pressure is arranged in the cylinder sleeve 21. One end of the sling 3 is connected to the end of the moving rod 23, and the other end is connected to the hook 4. A guiding piece 25 is arranged on the installation frame 7. The sling 3 extends from the end of the moving rod 23 and bypasses the guiding piece 25 to be connected to the hook 4. Through the guiding piece 25, the sling 3 is changed from the horizontal direction to the hoisting direction. Then, during hoisting, it can drive the moving rod 23 to move in the horizontal direction, avoiding the moving rod 23 and the piston 22 from being subjected to forces in other directions.

[0024] When the lifting hooks 4 on both sides are connected to the floor formwork and the distribution on both sides of the floor formwork is uneven, the tension is transmitted to the moving rod 23 through the sling 3. According to the different tensions, the moving rod 23 will drive the piston 22 to move different distances in the cylinder sleeve 21. At this time, since the volume of the cavity changes, the internal air pressure will also change. The detecting member 24 detects the air pressure in the cylinder sleeves 21 on both sides. If the air pressures on both sides are relatively consistent, that is, the pressure difference is within the acceptable working range, it indicates that the forces on both sides are balanced. If the detecting member 24 detects that the air pressures in the cylinder sleeves 21 on both sides are inconsistent, it indicates that the forces on both sides are uneven during hoisting. At this time, adjustment is required. It should be noted that when the air pressure in the cylinder sleeve 21 is initially consistent, the moving stroke of the piston 22 and the change in air pressure can be calculated. A controller can be set on this device and connected to the control system. Both the above-mentioned controller and the control system are prior arts and will not be elaborated here. That is, when the piston 22 moves a certain stroke, its air pressure value will also change correspondingly. Conversely, the air pressure in the cylinder sleeve 21 can be adjusted to drive the piston 22 to move, and then drive the sling 3 and the lifting hook 4 to move through the moving rod 23 to adjust the floor formwork to a horizontal state.

[0025] During actual use, since this application uses gas, it may be affected by temperature changes and gas leakage. Regarding temperature changes, this device belongs to the hoisting field. During actual use, excessive precision is not required. Furthermore, the change in temperature and the expansion of air are foreseeable, that is, the two are also related, and the error range of the value can be adjusted according to the specific temperature range. Regarding gas leakage, during long-term use, gas leakage is inevitable. However, the gas in the cylinder sleeve 21 can be supplemented by the air pump 6, and if the air pressure in the cylinder sleeve 21 changes too quickly, it can also be detected. It can be corrected by replacing the sealing ring, which will not affect the use of this device.

[0026] The guiding member 25 includes a rotating shaft 251 rotatably arranged in the mounting frame 7. A guiding wheel 252 is arranged on the outer side of the rotating shaft 251. A wire groove is formed on the outer side of the guiding wheel 252. The sling 3 is stuck in the wire groove, and the direction of force transmission is changed through the guiding wheel 252, so that the sling 3 drives the moving rod 23 to always move along the horizontal direction.

[0027] The detecting member 24 is a pressure sensor but not limited thereto, and it can also be other sensors that can detect air pressure changes.

[0028] An installation frame 8 is fixedly arranged on the outer side of the cylinder sleeve 21. Side plates 9 are arranged on both sides of the installation frame 8. Screw holes are formed on the side plates 9 and on both sides of the mounting frame 7, and the two are fixedly connected by bolts. Through bolt connection, the cylinder sleeve 21 can be conveniently installed and disassembled during maintenance, improving work efficiency.

[0029] The pipeline connector 5 includes two connecting pipes 51, and the bottom ends of the two connecting pipes 51 are respectively connected to the air inlet and the air outlet of the air pump 6, wherein the air pump 6 used in the present application is an integrated air suction and inflation pump, and its air inlet and the air outlet can be converted into each other. Its specific structure is the existing technology and will not be repeated here. The top ends of the two connecting pipes 51 are respectively connected to the cylinder sleeves 21 on both sides, and a joint 52 is provided at one end of the cylinder sleeve 21 close to the connecting pipe 51, and a valve body 53 is provided in the joint 52. The outer sides of the bottom ends of the two connecting pipes 51 are provided with branch pipes 54 connected to the outside world, and the branch pipes 54 are provided with electric control valves, so that the port of the air pump 6 is connected to the outside world through the branch pipe 54 or connected to the cylinder sleeve 21 through the connecting pipe 51.

[0030] The connection and disconnection of the joint 52 and the connecting pipe 51 can be controlled by the valve body 53, and whether the port of the air pump 6 is connected to the outside world can be controlled by the electric control valve. Through the valve body 53 and the electric control valve, when inflating one of the cylinder sleeves 21, the joint 52 of the cylinder sleeve 21 can be connected to the connecting pipe 51, and the other connecting pipe 51 is closed and the branch pipe 54 on the connecting pipe 51 is connected to the outside world. In this way, the air pump 6 can pump the outside air into the cylinder sleeve 21, or extract the air in the cylinder sleeve 21 to the outside.

[0031] The valve body 53 includes a fixed ring 531 fixedly arranged in the joint 52, a movable plug 532 is slidably arranged in the joint 52, the outer diameter of the movable plug 532 is the same as the inner diameter of the fixed ring 531, an ear plate 533 is arranged on the outer side of the movable plug 532, a guide rod 534 is fixedly arranged on the ear plate 533, the guide rod 534 slides through the fixed ring 531, a return spring 535 is arranged on the outer side of the guide rod 534, and the two ends of the return spring 535 are respectively connected to the ear plate 533 and the fixed ring 531, an electromagnet 536 is arranged inside the pipe mouth of the connecting pipe 51 close to the joint 52, and the end of the movable plug 532 close to the electromagnet 536 is made of magnetic material, and when the electromagnet 536 is energized, it attracts the movable plug 532 to make it separate from the fixed ring 531.

[0032] When the connector 52 needs to be connected to the connecting pipe 51, the electromagnet 536 is energized to attract the movable plug 532 to separate it from the fixed ring 531. At this time, the connector 52 is connected to the connecting pipe 51. When the electromagnet 536 is powered off, under the action of the reset spring 535, the movable plug 532 is reset to block the connector 52 again.

[0033] A lifting ring 10 is fixedly provided on one side of the mounting frame 7 near the end of the support frame 1. During lifting, the lifting ring 10 is connected with a steel cable, and the other end of the steel cable is connected to a lifting device such as a crane or an electric hoist, so that the support frame 1 can be lifted, and then the floor decking plate can be lifted.

[0034] In summary, the steel bar truss floor deck hoisting device realizes intelligent adjustment and stable hoisting through the pneumatic buffer unit 2. It adopts a cross-shaped support frame 1, and the pneumatic buffer units 2 are arranged at the four ends and connected to the floor deck through the slings 3 and hooks 4. The air pump 6 regulates the air pressure of each unit through the pipeline connector 5, and realizes dual functions by using the gas compressibility and pressure balance principle. During hoisting, the pneumatic unit absorbs the initial impact force to avoid rigid collision; when the length direction of the floor deck causes uneven force on both sides due to the center of gravity deviation, the air pressure sensor detects the pressure difference in real time, and the controller drives the air pump 6 and the solenoid valve to adjust the displacement of the corresponding unit piston 22 by charging and discharging air, so as to drive the sling 3 to move horizontally and automatically correct the floor deck to a horizontal state. Compared with the traditional spring buffer device, the pneumatic system has no metal fatigue problem, and the buffering performance can be kept stable for a long time. The automatic adjustment function can compensate for human operation errors, improve installation accuracy and efficiency, and the modular design such as the bolted cylinder sleeve 21 and the replaceable sealing ring are easy to maintain. The guide wheel 252 structure ensures accurate force transmission direction, which improves the overall construction safety, operation convenience and equipment durability.

[0035] Example 2: Please refer to Figures 9 - 11 The present invention provides a technical solution: on the basis of Example 1, an adjusting pipe 11 is fixedly installed on the outer side of the installation frame 7 arranged along the length direction of the floor decking plate, the adjusting pipe 11 is Z-shaped, and its two ends are respectively connected to the installation frames 7 on both sides, that is, one end of the two ends of the adjusting pipe 11 is located on the upper side of one of the installation frames 7, and the other end is located on the lower side of the other installation frame 7. The adjusting pipe 11 is a tubular with two ends opened, and the middle part is connected to the connecting pipe 51. An electric control valve is arranged between the adjusting pipe 11 and the connecting pipe 51. Two adjusting pipes 11 are provided and are respectively located on both sides of the installation frame 7. When the electric control valve is opened, the air pump 6 can be connected to the adjusting pipe 11 through the connecting pipe 51, so that the two ends of the adjusting pipe 11 can spray outward, and due to the Z-shape of the adjusting pipe 11, when the two ends of the adjusting pipe 11 spray, it can drive the support frame 1 to rotate in one direction. The diameter of the openings at both ends of the adjusting pipe 11 is smaller than the diameter of its main body. In this way, the gas flow rate ejected from the adjusting pipe 11 is faster.

[0036] Furthermore, during hoisting, the jets from the two adjusting tubes 11 can exert a certain rotational thrust on the support frame 1, which can offset the shaking caused during hoisting. If automatic control is adopted, a displacement sensor is installed on the support frame 1 to detect the rotation of the support frame 1 in real time and then make adjustments. Secondly, when the floor decking arrives at the installation top, the opening and closing of the two adjusting tubes 11 can also be manually controlled. Specifically, a remote control can be provided so that workers can control it, and this method can also assist in the alignment of the floor decking before installation.

[0037] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A lifting device for installing a steel truss floor deck, comprising a support frame (1), wherein the support frame (1) is cross-shaped, and is characterized in that: The four sections of the support frame (1) are all provided with pneumatic buffer units (2), the ends of the pneumatic buffer units (2) are all provided with slings (3) and hooks (4), a pipe connector (5) is provided between two pneumatic buffer units (2) arranged along the length direction of the floor deck, and an air pump (6) is provided at the bottom of the support frame (1), and the air pump (6) is connected to the pipe connector (5); The support frame (1) is fixedly provided with a mounting frame (7), the pneumatic buffer unit (2) comprises a cylinder sleeve (21) arranged in the mounting frame (7), a piston (22) is slidably arranged in the cylinder sleeve (21), a moving rod (23) is arranged on the piston (22), the end of the moving rod (23) passes through the cylinder sleeve (21), a detection member (24) for detecting the internal air pressure is arranged in the cylinder sleeve (21), one end of the sling (3) is connected to the end of the moving rod (23), and the other end is connected to the hook (4), the mounting frame (7) is provided with a guide member (25), and the sling (3) extends from the end of the moving rod (23), bypasses the guide member (25), and is connected to the hook (4).

2. The lifting device for installing a steel bar truss floor deck according to claim 1 is characterized in that: The guide member (25) comprises a rotating shaft (251) rotatably arranged in the installation frame (7), a guide wheel (252) is arranged outside the rotating shaft (251), and a wire groove is opened outside the guide wheel (252).

3. The lifting device for installing a steel bar truss floor deck according to claim 1 is characterized in that: The detection component (24) is an air pressure sensor.

4. The lifting device for installing a steel truss floor deck according to claim 1 is characterized in that: A mounting frame (8) is fixedly arranged on the outside of the cylinder sleeve (21), and side plates (9) are arranged on both sides of the mounting frame (8). Screw holes are provided on the side plates (9) and on both sides of the mounting frame (7), and the two are fixedly connected by bolts.

5. The lifting device for installing a steel bar truss floor deck according to claim 1 is characterized in that: The pipeline connector (5) comprises two connecting pipes (51), the bottom ends of the two connecting pipes (51) are respectively connected to the air inlet and the air outlet of the air pump (6), and the top ends of the two connecting pipes (51) are respectively connected to the cylinder sleeves (21) on both sides, a joint (52) is provided at one end of the cylinder sleeve (21) close to the connecting pipe (51), a valve body (53) is provided in the joint (52), and a branch pipe (54) connected to the outside is provided on the outer side of the bottom ends of the two connecting pipes (51), and an electric control valve is provided on the branch pipe (54), so that the port of the air pump (6) is connected to the outside through the branch pipe (54) or is connected to the cylinder sleeve (21) through the connecting pipe (51).

6. The lifting device for installing a steel bar truss floor deck according to claim 5, characterized in that: The valve body (53) comprises a fixed ring (531) fixedly arranged in the joint (52); a movable plug (532) is slidably arranged in the joint (52); the outer diameter of the movable plug (532) is the same as the inner diameter of the fixed ring (531); an ear plate (533) is arranged on the outer side of the movable plug (532); a guide rod (534) is fixedly arranged on the ear plate (533); the guide rod (534) slidably penetrates the fixed ring (531); a return spring (535) is arranged on the outer side of the guide rod (534); two ends of the return spring (535) are respectively connected to the ear plate (533) and the fixed ring (531); an electromagnet (536) is arranged inside the pipe opening of the connecting pipe (51) close to the joint (52); one end of the movable plug (532) close to the electromagnet (536) is made of magnetic material; when the electromagnet (536) is energized, it attracts the movable plug (532) to separate it from the fixed ring (531).

7. The lifting device for installing a steel bar truss floor deck according to claim 1 is characterized in that: A lifting ring (10) is fixedly provided on one side of the installation frame (7) close to the end of the support frame (1).

8. The lifting device for installing a steel bar truss floor deck according to claim 7, characterized in that: An adjusting pipe (11) is fixedly installed on the outside of the installation frame (7) arranged along the length direction of the floor decking plate. The adjusting pipe (11) is Z-shaped, and its two ends are respectively connected to the installation frames (7) on both sides. The adjusting pipe (11) is a tube with two ends open, and its middle is connected to the connecting pipe (51). An electric control valve is arranged between the adjusting pipe (11) and the connecting pipe (51). Two adjusting pipes (11) are arranged and are respectively located on both sides of the installation frame (7).

9. The lifting device for installing a steel bar truss floor deck according to claim 8, characterized in that: The diameters of the openings at both ends of the regulating tube (11) are smaller than the diameter of its main body.

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