Smoke flue carrying and hoisting trolley convenient to operate and carry

By designing a flue air duct handling and hoisting truck that is easy to operate, the front frame, rear frame and multiple mechanisms are used to solve the problem of inconvenient handling during the installation of the flue air duct, and the installation efficiency and operation convenience are improved.

CN119568894APending Publication Date: 2025-03-07朱德红
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Patent Information

Application Number
CN202411792393.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-07
Publication Date
2025-03-07

AI Technical Summary

Technical Problem

During the installation process, the existing flue air ducts are large in weight and long in length, which leads to inconvenient handling and lifting operations, affecting the installation efficiency and quality, and increasing the construction difficulty.

Method used

A flue air duct handling and hoisting truck is designed for easy operation and carrying. Two sets of parallel front frames and rear frames are adopted, combining a stabilizing mechanism, a lifting mechanism, a hand-crank winch and a locking mechanism to realize vertical lifting and horizontal handling adjustment of the flue air duct.

Benefits of technology

It improves the difficulty of handling, lifting and installation of the smoke duct, reduces the labor intensity of the installer, and improves the installation efficiency. At the same time, the car structure is simple and stable, which is easy to adjust and operate, and reduces the footprint.

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Abstract

The invention relates to the technical field of environmental protection, and discloses a flue carrying and hoisting trolley convenient to operate and carry, which comprises two groups of front frames arranged in parallel, the front frames are rotatably connected with rear frames, and stabilizing mechanisms are connected between the tops of the two groups of front frames and between the tops of the two groups of rear frames; the top of the stabilizing mechanism located on the top of the front frame is fixedly connected with a hoisting mechanism. Vertical hoisting carrying and transverse carrying adjustment operation of the flue gas duct is achieved, carrying and hoisting installation operation of the flue gas duct in different environments is facilitated, the flue gas duct carrying, hoisting and installation difficulty is improved, the labor intensity of installation personnel is reduced, the flue gas duct carrying and installation efficiency is improved, and meanwhile the carrying and hoisting trolley is simple and stable in structure and convenient to use. Adjustment operation is convenient, an operator can conveniently adjust the carrying state of the flue, and the operation efficiency is improved; the carrying and hoisting trolley can be stored and fixedly placed, storage and conveying are convenient, and the occupied space is reduced.
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Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a flue gas duct transporting and hoisting trolley which is easy to operate and carry. Background Art

[0002] The flue duct is a tubular device for exhaust gas and smoke. The residential flue refers to a vertical pipe product used to remove kitchen smoke or bathroom exhaust gas, also known as an exhaust duct, ventilation duct, and residential exhaust duct. The existing flue ducts are all prefabricated in the form of prefabricated products. After the main construction of the building is completed, they are assembled and installed according to the design requirements of the flue. Since the flue duct is generally cast and cured using cement concrete combined with reinforcement components, the flue is long and heavy overall. During the installation process, multiple groups of people are required to carry out the lifting and handling operations. Since it is installed inside the building, it is affected by the building space, and the lifting and handling operations of the flue are inconvenient, which seriously affects the installation efficiency and quality of the flue duct and increases the construction difficulty of the installation operators. For this reason, a flue duct carrying and lifting trolley that is easy to operate and carry is proposed. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a flue gas duct transport and hoisting trolley which is easy to operate and carry.

[0004] The present invention is implemented by the following technical scheme: a flue gas duct transport hoisting trolley that is easy to operate and carry, comprising two groups of front frames arranged in parallel, the front frames are rotatably connected to the rear frames, a stabilizing mechanism is connected between the tops of the two groups of front frames and between the tops of the two groups of rear frames, a hoisting mechanism is fixedly connected to the top of the stabilizing mechanism located at the top of the front frames, a hand-cranked winch is fixedly connected to the top of the stabilizing mechanism located at the top of the rear frames, a locking mechanism is connected between the stabilizing mechanism and the front frame and the rear frame and between the front frame and the rear frame, and a lifting mechanism is connected between the two groups of front frames and between the two groups of rear frames;

[0005] The front frame includes a column, a support frame with a U-shaped structure is fixedly connected to the bottom of the column, a travel wheel is rotatably connected to the inner side of the support frame, a cross bar rotatably connected to the rear frame is fixedly connected to one side of the column, an adjustment mechanism for installing and storing the trolley is fixedly connected to the top of the cross bar, the adjustment mechanism is fixedly connected to an oblique brace, the other end of the oblique brace is fixedly connected to a cross beam fixedly connected to the top of the adjacent column, a mounting plate 1 is fixedly connected to the top of the cross beam, and the mounting plate 1 is reserved with two groups of mounting holes 1 connected to the stabilizing mechanism;

[0006] The rear frame includes an extension rod rotatably connected to an adjacent cross bar, a rear support rod arranged parallel to the column is fixedly connected to the bottom of the other end of the extension rod, a universal caster is fixedly connected to the bottom of the rear support rod, and a second mounting plate is fixedly connected to the top of one end of the extension rod away from the adjacent cross bar, and the second mounting plate is reserved with two groups of second mounting holes connected to the stabilizing mechanism;

[0007] The stabilizing mechanism includes a supporting plate, a connecting frame with an annular structure is fixedly connected to the top of the supporting plate, a channel penetrating the supporting plate is opened at the inner circle of the connecting frame, two groups of mounting holes penetrating the supporting plate are opened at both ends of the connecting frame, and storage holes penetrating the supporting plate are opened on both sides of the connecting frame, and the number of storage holes on the same side of the connecting frame is four.

[0008] As a further improvement of the above scheme, the adjustment mechanism is fixed to a base plate at the top of the cross bar, and a limiting plate that contacts the side of the cross bar is fixed to the lower part of the side of the base plate away from the lifting mechanism. An extension groove is provided along its length direction at the bottom of the side of the base plate away from the limiting plate, and two groups of adjustment holes that penetrate the base plate are provided on the inner side wall at the top of the extending groove. The adjustment holes are connected to the locking mechanism, and the side of the base plate away from the limiting plate extends from the side of the cross bar.

[0009] As a further improvement of the above solution, the lifting mechanism includes a support plate, the bottoms of both ends of the support plate are in contact with a placement groove with a U-shaped structure, and the placement groove is fixedly connected to the adjacent rear support rod or support frame.

[0010] As a further improvement of the above solution, the second mounting plate extends from a side away from the lifting mechanism to a side of the extension rod, and the second mounting hole is located on a top side of the extension rod.

[0011] As a further improvement of the above solution, the side of the mounting plate 1 away from the lifting mechanism extends to the side of the beam, and the mounting hole 1 is located on the top side of the beam.

[0012] As a further improvement of the above scheme, the lifting mechanism includes a U-shaped fixed seat fixedly connected to the top of the stabilizing mechanism, a pulley is rotatably connected between the two inner walls of the fixed seat, the outer ring of the pulley is connected to a traction rope connected to a hand winch, and a hook is fixed to the end of the traction rope.

[0013] As a further improvement of the above scheme, the locking mechanism includes a pressure rod, the bottoms of both ends of the pressure rod are fixedly connected to connecting screws, the outer ring of the connecting screw is slidably sleeved with a resistance block, and the connecting screw is threadedly sleeved with a locking nut.

[0014] The cross bar and the extension rod are rotatably connected by a hinge, and the hinge is located on a side of the cross bar and the extension rod close to the lifting mechanism.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention realizes the vertical hoisting and handling and lateral handling and adjustment operation of the flue gas duct, which is convenient for the handling and hoisting installation operation of the flue gas duct in different environments, improves the difficulty of handling, hoisting and installing the flue gas duct, reduces the labor intensity of the installers, and improves the handling and installation efficiency of the flue gas duct. At the same time, the structure of the handling and hoisting trolley is simple and stable, which is convenient for adjustment operation, and is convenient for the operator to adjust the handling state of the flue gas duct, thereby improving the operating efficiency;

[0017] 2. The storage and fixed placement of the transport and lifting trolley is realized. It can be stored and fixed when being transported or not in use, which is convenient for storage and transportation and reduces the space occupied. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a flue gas duct transport and hoisting trolley that is easy to operate and carry provided by the present invention;

[0019] Figure 2 The present invention provides Figure 1 A partial enlarged view of the

[0020] Figure 3 A schematic diagram of the structure of the stabilizing mechanism provided by the present invention;

[0021] Figure 4 A schematic diagram of the structure of the adjustment mechanism provided by the present invention;

[0022] Figure 5 A schematic diagram of the structure of the lifting mechanism provided by the present invention;

[0023] Figure 6 This is a schematic structural diagram of the pressure rod and the connecting screw provided by the present invention.

[0024] Description of main symbols:

[0025] 1. Front frame; 2. Rear frame; 3. Stabilizing mechanism; 4. Hand winch; 5. Hoisting mechanism; 6. Locking mechanism; 7. Lifting mechanism; 11. Column; 12. Crossbar; 13. Adjustment mechanism; 14. Diagonal brace; 15. Crossbeam; 16. Mounting plate one; 17. Mounting hole one; 18. Support frame; 19. Travel wheel; 21. Extension rod; 22. Rear support rod; 23. Universal caster; 24. Mounting plate two; 25. Mounting hole two; 31. Loading plate; 32. Channel; 33. Mounting hole three; 34. Storage hole; 35. Connection frame; 41. Base plate; 42. Limiting plate; 44. Adjustment hole; 61. Pressure rod; 62. Connecting screw; 63. Resistance block; 64. Locking nut; 71. Support plate; 72. Placement slot. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0027] Embodiment 1:

[0028] Please combine Figure 1-Figure 6 , a flue gas duct transport hoisting trolley that is easy to operate and carry in this embodiment comprises two sets of front frames 1 arranged in parallel, the front frames 1 are rotatably connected to the rear frames 2, a stabilizing mechanism 3 is connected between the tops of the two sets of front frames 1 and between the tops of the two sets of rear frames 2, a hoisting mechanism 5 is fixedly connected to the top of the stabilizing mechanism 3 located at the top of the front frame 1, a hand-cranked winch 4 is fixedly connected to the top of the stabilizing mechanism 3 located at the top of the rear frame 1, a locking mechanism 6 is connected between the stabilizing mechanism 3 and the front frame 1 and the rear frame 2, and between the front frame 1 and the rear frame 2, and a lifting mechanism 7 is connected between the two sets of front frames 1 and between the two sets of rear frames 2;

[0029] The front frame 1 includes a column 11, a U-shaped support frame 18 is fixedly connected to the bottom of the column 11, a travel wheel 19 is rotatably connected to the inner side of the support frame 18, a cross bar 12 rotatably connected to the rear frame 2 is fixedly connected to one side of the column 11, an adjustment mechanism 13 for installing and storing the trolley is fixedly connected to the top of the cross bar 12, the adjustment mechanism 13 is fixedly connected to an oblique brace 14, the other end of the oblique brace 14 is fixedly connected to a cross beam 15 fixedly connected to the top of the adjacent column 11, a mounting plate 16 is fixedly connected to the top of the cross beam 15, and the mounting plate 16 is reserved with two groups of mounting holes 17 connected to the stabilizing mechanism 3;

[0030] The rear frame 2 includes an extension rod 21 rotatably connected to the adjacent cross bar 12, the bottom of the other end of the extension rod 21 is fixedly connected to a rear support rod 22 arranged parallel to the column 11, the bottom of the rear support rod 22 is fixedly connected to a universal caster 23, and the top of one end of the extension rod 21 away from the adjacent cross bar 12 is fixedly connected to a second mounting plate 24, and the second mounting plate 24 is reserved with two groups of second mounting holes 25 connected to the stabilizing mechanism 3;

[0031] The stabilizing mechanism 3 includes a supporting plate 31, a connecting frame 35 of an annular structure is fixedly connected to the top of the supporting plate 31, a channel 32 penetrating the supporting plate 31 is provided at the inner circle of the connecting frame 35, two groups of mounting holes 33 penetrating the supporting plate 31 are provided at both ends of the connecting frame 35, and storage holes 34 penetrating the supporting plate 31 are provided on both sides of the connecting frame 35, and the number of storage holes 34 on the same side of the connecting frame 35 is four.

[0032] The implementation principle of a flue gas duct transport and hoisting trolley that is easy to operate and carry in the embodiment of the present application is as follows: rotate the extension rod 21 so that the extension rod 21 and the cross bar 12 are in the same straight line, and then install the locking mechanism 6 on the adjustment mechanism 13 at the end of the cross bar 12 to complete the locking and fixing connection of the extension rod 21 and the cross bar 12 by the locking mechanism 6, and then install the stabilizing mechanism 3 on the top of the mounting plate 1 16 of the two groups of front frames 1 and the top of the mounting plate 2 24 at the top of the extension rod 21 and use the locking mechanism 6 to lock and install, thereby completing the installation operation of the transport and hoisting trolley; when storing and transporting, the stabilizing mechanism 3 is removed, and at the same time, the two groups of stabilizing mechanisms 3 are close to each other, so that the hand winch 4 and the hoisting mechanism 5 are distributed on the side where the two groups of bearing plates 31 are away from each other, and then the connecting screw 62 is inserted from the adjustment hole 44 under the base plate 41 The two front frames 1 are pushed toward each other, and the two stacked stabilizing mechanisms 3 are placed above the adjusting mechanism 13 and the second mounting plate 24, so that the connecting screw 62 on the adjusting mechanism 13 extends from two of the receiving holes 34 on the base plate 31, and then is locked and fixed with the locking nut 64. The two stacked base plates 31 are installed on the mounting plate 24 of the turned extension rod 21 by the locking mechanism 6. At this time, the connecting screw 62 is docked with the remaining receiving holes 34, and the base plate 31 is used to complete the fixed connection of the extension rod 21 and the adjusting mechanism 13, thereby realizing the storage operation of the transport and hoisting trolley.

[0033] Embodiment 2:

[0034] The adjustment mechanism 13 is fixedly connected to a base plate 41 at the top of the cross bar 12, and a limiting plate 42 is fixedly connected to the lower side of the base plate 41 away from the lifting mechanism 7, and a projection groove 43 is provided along its length direction at the bottom of the base plate 41 away from the limiting plate 42, and two groups of adjustment holes 44 are provided on the inner side wall of the top of the projection groove 43, which penetrate the base plate 41, and the adjustment holes 44 are connected to the locking mechanism 6, and the side of the base plate 41 away from the limiting plate 42 extends out from the side of the cross bar 12.

[0035] The lifting mechanism 7 includes a supporting plate 71 , the bottoms of both ends of the supporting plate 71 are in contact with a placement groove 72 with a U-shaped structure, and the placement groove 72 is fixedly connected to the adjacent rear support rod 22 or the support frame 18 .

[0036] The second mounting plate 24 extends from a side away from the lifting mechanism 7 to a side of the extension rod 21 , and the second mounting hole 25 is located on a top side of the extension rod 21 .

[0037] The mounting plate 16 extends from one side of the lifting mechanism 7 to the side of the beam 15 , and the mounting hole 17 is located on one side of the top of the beam 15 .

[0038] The hoisting mechanism 5 includes a U-shaped fixed seat fixedly connected to the top of the stabilizing mechanism 3, a pulley is rotatably connected between the two inner side walls of the fixed seat, a traction rope connected to the hand winch 4 is connected to the outer ring of the pulley, and a hook is fixedly connected to the end of the traction rope.

[0039] The locking mechanism 6 comprises a pressure rod 61 , the bottoms of both ends of the pressure rod 61 are fixedly connected with connecting screws 62 , the outer ring of the connecting screw 62 is slidably sleeved with a resistance block 63 , and the connecting screw 62 is threadedly sleeved with a locking nut 64 .

[0040] The cross bar 12 and the extension bar 21 are rotatably connected by a hinge, and the hinge is located on a side of the cross bar 12 and the extension bar 21 close to the lifting mechanism 7 .

[0041] Working principle:

[0042] During installation and use, the extension rod 21 is rotated so that the extension rod 21 and the cross bar 12 are in the same straight line, and then the locking mechanism 6 is installed on the adjustment mechanism 13 at the end of the cross bar 12 to complete the locking and fixing connection of the extension rod 21 and the cross bar 12 by the locking mechanism 6. Thereafter, the stabilizing mechanism 3 is installed on the top of the mounting plate 16 of the two groups of front frames 1 and the top of the mounting plate 24 of the top of the extension rod 21 and locked and installed using the locking mechanism 6, thereby completing the installation operation of the transport and hoisting trolley; when storing and transporting, the stabilizing mechanism 3 is removed, and at the same time, the two groups of stabilizing mechanisms 3 are close to each other, so that the hand winch 4 and the hoisting mechanism 5 are distributed on the side of the two groups of bearing plates 31 away from each other, and then the connecting screw 62 is extended upward from the adjustment hole 44 under the base plate 41, and then the extension rod 21 is rotated toward the column 11, and the side of the extension rod 21 contacts the side of the cross bar 12. At this time, the pressure rod 61 contacts the top of the extension rod 21 after rotation. Then, the two groups of front frames 1 are pushed in the direction of approaching each other, and the two stacked groups of stabilizing mechanisms 3 are placed above the adjustment mechanism 13 and the second mounting plate 24, so that the connecting screw 62 on the adjustment mechanism 13 extends from two of the storage holes 34 on the base plate 31, and then is locked and fixed by the locking nut 64. The two groups of stacked base plates 31 are installed on the second mounting plate 24 of the turned extension rod 21 by the locking mechanism 6. At this time, the connecting screw 62 is docked with the remaining storage hole 34, and the base plate 31 is used to complete the fixed connection of the extension rod 21 and the adjustment mechanism 13, thereby realizing the storage operation of the transport hoisting trolley;

[0043] When carrying out the transport operation, the flue gas duct is bundled with a binding belt, which is tied in the middle of the flue gas duct, and then the transport hoisting trolley is pushed to the position of the flue gas duct, and the hook is moved downward by the hand winch 4, and then the binding belt is hung on the hook, and the hook is moved upward by the hand winch 4, so that the flue gas duct is lifted upward. When the flue gas duct is lifted upward and leaves the ground, the flue gas duct is in an upward tilted state, and the flue gas duct can be transported in a narrow area by a vertical pushing forward method;

[0044] When the transport space is too low and vertical tilting transport is not possible, first hang the flue gas duct in the above-mentioned manner, then lift the flue gas duct upward from the lower end at the rear of the flue gas duct, then place the pallet 71 in the placement groove 72, and then move the flue gas duct downward and place it on the two sets of pallets 71. At this time, the flue gas duct is in a horizontal and flat state. At this time, the transport space is too low for transport, which realizes the vertical lifting and transport and lateral transport adjustment operations of the flue gas duct, facilitates the transport and lifting and installation operations of the flue gas duct in different environments, increases the difficulty of transporting, lifting and installing the flue gas duct, reduces the labor intensity of the installers, and improves the transport and installation efficiency of the flue gas duct. At the same time, the transport and lifting trolley has a simple and stable structure, which is easy to adjust and operate, and is convenient for the operator to adjust the transport state of the flue gas duct, thereby improving the operating efficiency.

[0045] The invention realizes the vertical hoisting and handling and lateral handling and adjustment operation of the flue gas duct, which is convenient for the handling and hoisting installation of the flue gas duct in different environments, improves the difficulty of handling, hoisting and installing the flue gas duct, reduces the labor intensity of the installers, and improves the handling and installation efficiency of the flue gas duct. At the same time, the structure of the handling and hoisting trolley is simple and stable, which is convenient for adjustment operation, and is convenient for the operator to adjust the handling state of the flue gas duct, thereby improving the operating efficiency.

[0046] The transport and lifting trolley can be stored and fixed when being transported or not in use, which is convenient for storage and transportation and reduces space occupied.

[0047] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A flue gas duct transport and lifting trolley that is easy to operate and carry, characterized in that: The vehicle comprises two sets of front frames arranged in parallel, the front frames are rotatably connected to the rear frames, a stabilizing mechanism is connected between the tops of the two sets of front frames and between the tops of the two sets of rear frames, a hoisting mechanism is fixedly connected to the top of the stabilizing mechanism located at the top of the front frames, a hand-cranked winch is fixedly connected to the top of the stabilizing mechanism located at the top of the rear frames, a locking mechanism is connected between the stabilizing mechanism and the front frame and the rear frame and between the front frame and the rear frame, and a lifting mechanism is connected between the two sets of front frames and between the two sets of rear frames; The front frame includes a column, a support frame with a U-shaped structure is fixedly connected to the bottom of the column, a travel wheel is rotatably connected to the inner side of the support frame, a cross bar rotatably connected to the rear frame is fixedly connected to one side of the column, an adjustment mechanism for installing and storing the trolley is fixedly connected to the top of the cross bar, the adjustment mechanism is fixedly connected to an oblique brace, the other end of the oblique brace is fixedly connected to a cross beam fixedly connected to the top of the adjacent column, a mounting plate 1 is fixedly connected to the top of the cross beam, and the mounting plate 1 is reserved with two groups of mounting holes 1 connected to the stabilizing mechanism; The rear frame includes an extension rod rotatably connected to an adjacent cross bar, a rear support rod arranged parallel to the column is fixedly connected to the bottom of the other end of the extension rod, a universal caster is fixedly connected to the bottom of the rear support rod, and a second mounting plate is fixedly connected to the top of one end of the extension rod away from the adjacent cross bar, and the second mounting plate is reserved with two groups of second mounting holes connected to the stabilizing mechanism; The stabilizing mechanism includes a supporting plate, a connecting frame with an annular structure is fixedly connected to the top of the supporting plate, a channel penetrating the supporting plate is opened at the inner circle of the connecting frame, two groups of mounting holes penetrating the supporting plate are opened at both ends of the connecting frame, and storage holes penetrating the supporting plate are opened on both sides of the connecting frame, and the number of storage holes on the same side of the connecting frame is four.

2. A flue gas duct transport and lifting trolley that is easy to operate and carry as claimed in claim 1, characterized in that: The adjustment mechanism is fixed to the base plate at the top of the cross bar, and a limiting plate that contacts the side of the cross bar is fixed to the lower part of the base plate away from the lifting mechanism. An extension groove is provided along its length direction at the bottom of the base plate away from the limiting plate, and two groups of adjustment holes that penetrate the base plate are provided on the inner side wall at the top of the extension groove. The adjustment holes are connected to the locking mechanism, and the side of the base plate away from the limiting plate extends out from the side of the cross bar.

3. The easy-to-operate and portable flue gas duct transport and lifting trolley as claimed in claim 1, characterized in that: The lifting mechanism comprises a supporting plate, the bottoms of both ends of the supporting plate abut against a placement groove with a U-shaped structure, and the placement groove is fixedly connected to an adjacent rear support rod or a support frame.

4. The easy-to-operate and portable flue gas duct transport and lifting trolley according to claim 1, characterized in that: The second mounting plate extends from one side of the lifting mechanism to the side of the extension rod, and the second mounting hole is located on one side of the top of the extension rod.

5. The easy-to-operate and portable flue gas duct transport and hoisting trolley according to claim 1, characterized in that: The side of the mounting plate 1 away from the lifting mechanism extends to the side of the beam, and the mounting hole 1 is located on the top side of the beam.

6. The easy-to-operate and portable flue gas duct transport and hoisting trolley according to claim 1, characterized in that: The lifting mechanism includes a U-shaped fixed seat fixedly connected to the top of the stabilizing mechanism, a pulley is rotatably connected between the two inner side walls of the fixed seat, the outer ring of the pulley is connected to a traction rope connected to a hand winch, and a hook is fixedly connected to the end of the traction rope.

7. The easy-to-operate and portable flue gas duct transport and lifting trolley according to claim 1, characterized in that: The locking mechanism comprises a pressure rod, the bottoms of both ends of the pressure rod are fixedly connected with connecting screws, the outer ring of the connecting screw is slidably sleeved with a resistance block, and the connecting screw is threadedly sleeved with a locking nut.

8. The easy-to-operate and portable flue gas duct transport and lifting trolley as claimed in claim 1, characterized in that: The cross bar and the extension rod are rotatably connected by a hinge, and the hinge is located on a side of the cross bar and the extension rod close to the lifting mechanism.