Hoisting device for upper cover of induced draft fan

Abstract

The invention relates to the technical field of induced draft fan installation, and discloses an induced draft fan upper cover hoisting device which comprises a U-shaped frame and lead screws, sliding grooves are formed in the inner walls of the two sides of the U-shaped frame, the lead screws are rotationally arranged in the corresponding sliding grooves, the rod walls of the lead screws are sleeved with sliding blocks in a threaded mode, and the upper ends of the two lead screws are fixedly sleeved with worm wheels. And worms are rotationally arranged on the inner sides of the upper ends of the sliding grooves, the worms on the two sides are in meshed connection with the corresponding worm wheels, transmission mechanisms for driving the two worms to synchronously rotate are arranged on the two sides of the upper end of the U-shaped frame, a transverse rod is fixedly arranged on one side of the sliding block, and the rod wall of the transverse rod is movably sleeved with a sliding sleeve. According to the lifting device for the upper cover of the induced draft fan, the two lifting shells capable of moving reversely are arranged, the lifting shell on one side can descend and reset while the lifting shell on the other side conducts lifting work, then highly continuous lifting work can be conducted, the time wasted by resetting of the lifting shells is shortened, and the working efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of induced draft fan installation, and in particular to an induced draft fan upper cover hoisting device. Background Art

[0002] The induced draft fan hoisting technology of thermal power units is an important supporting technology in the power generation industry, which involves transporting the required parts or maintenance supplies of the fan from the ground to the required location in the air.

[0003] Among them, announcement number CN205061416U discloses an OG fan cover hoisting device, including a crossbeam, a column, a support body and a hoisting mechanism; the column is vertically fixed to the two ends of the crossbeam, and the lower end of the column is connected to the support body; the hoisting mechanism is installed in the middle of the crossbeam; the hoisting mechanism includes a lifting lug, a hand chain hoist and a wire rope; the lifting lug includes an upper lifting lug and a lower lifting lug; the upper lifting lug and the lower lifting lug are both semicircular rectangles, and a lifting hole is provided at the center of the semicircle of the upper lifting lug and the lower lifting lug; the upper end of the hand chain hoist is sleeved in the lifting hole of the lower lifting lug, and the lower end is connected to the wire rope. There are still defects in this technical solution:

[0004] Since only a single lifting station is provided in this technical solution, after completing a lifting work, the lifting station needs to be reset to a lower position before the lifting work can be performed again, so a lot of time will be wasted during the process, thereby reducing work efficiency. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides an induced draft fan upper cover lifting device which is provided with two lifting shells that can move in opposite directions. While the lifting shell on one side is performing lifting work, the lifting shell on the other side is lowered and reset. It has the advantages of being able to perform highly continuous lifting work, reducing the time wasted in resetting the lifting shell, and improving work efficiency. It solves the problem that in the prior art, the OG fan small cover lifting device is only provided with a single lifting station. Therefore, after completing a lifting work, the lifting station needs to be reset to a lower position before the lifting work can be performed again, thus wasting much time and thus reducing work efficiency.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting device for the upper cover of an induced draft fan, comprising a U-shaped frame and a screw rod, wherein the inner walls on both sides of the U-shaped frame are provided with sliding grooves, the screw rod is rotatably arranged inside the corresponding sliding grooves, the rod wall of the screw rod is threadedly sleeved with a slider, the upper ends of the two screw rods are fixedly sleeved with worm wheels, the inner sides of the upper ends of the sliding grooves are rotatably provided with worms, the worms on both sides are meshed and connected with the corresponding worm wheels, and the upper ends of the U-shaped frame are provided with two worms that drive the two worms to rotate synchronously. A transmission mechanism for a movable body, a cross bar is fixedly provided on one side of the slider, a sliding sleeve is movably provided on the rod wall of the cross bar, a first cavity is provided inside the cross bar, a first limiting mechanism for limiting the movement of the sliding sleeve relative to the cross bar is provided inside the first cavity, a lifting shell is provided on the upper side of the sliding sleeve, a wedge-shaped groove is provided on the upper side of the sliding sleeve, a wedge block is slidably provided inside the wedge groove, the upper side of the wedge block is fixedly connected to the lifting shell, and second limiting mechanisms for limiting the movement of the wedge block are provided on both sides of the sliding sleeve.

[0009] Preferably, the transmission mechanism includes a transmission wheel and a motor, the two transmission wheels are arranged at the two ends of the rear side of the U-shaped frame, the rear ends of the two worms extend to the outside of the U-shaped frame, the two transmission wheels are fixedly sleeved with the rear ends of the corresponding worms, the two transmission wheels are connected by a transmission belt, and a motor is fixedly arranged on the front side of the upper end of the U-shaped frame, and the output end of the motor is fixedly connected to one end of the corresponding worm.

[0010] Preferably, the first limiting mechanism includes a movable plate and a stopper, the movable plate is slidably arranged inside the first cavity, the two stoppers are abutted against each other on both sides of the sliding sleeve, the lower ends of the two stoppers extend into the first cavity, the lower ends of the two stoppers are fixedly connected to one end of the corresponding movable plate, springs are fixedly arranged on both sides of the lower surface of the movable plate, and the other end of the spring is fixedly connected to the inner wall of the first cavity.

[0011] Preferably, the second limiting mechanism includes a rotating rod and a baffle, a second cavity is opened in the middle of the sliding sleeve and located at the lower side of the wedge-shaped groove, the rotating rod is passed through the interior of the second cavity, both ends of the rotating rod are rotatably connected to the inner wall of the second cavity, the two baffles are abutted against each other on both sides of the sliding sleeve, one end of the two baffles is fixedly sleeved with one end of the corresponding rotating rod, and the other end of the two baffles is in contact with one side of the corresponding wedge block.

[0012] Preferably, a torsion spring is provided on the movable sleeve of the rod wall of the rotating rod, and two ends of the torsion spring are respectively fixedly connected to the corresponding rotating rod and the inner wall of the second cavity.

[0013] Preferably, the cross-sections of the movable plate and the first cavity are both rectangular.

[0014] Preferably, abutment blocks are fixedly provided on the inner walls of both sides of the upper end of the U-shaped frame and at positions corresponding to the stop blocks.

[0015] Preferably, the longitudinal sections of the sliding sleeve and the cross bar are both rectangular.

[0016] Preferably, counterweight plates are provided at both ends of the lower side of the U-shaped frame.

[0017] Preferably, an anti-dropping block is fixedly provided on a side of the cross bar away from the sliding block.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a device for hoisting the upper cover of an induced draft fan, which has the following beneficial effects:

[0020] 1. The induced draft fan upper cover lifting device drives a worm on one side to rotate through a motor, and the worm on the other side is driven by a transmission wheel and a transmission belt, so that the two worms drive the corresponding worm wheels to rotate, and then the lead screws on both sides rotate in opposite directions, and then the sliders on both sides move in opposite directions, that is, when one side of the lifting shell moves up to lift the induced draft fan upper cover, the other side of the lifting shell moves down to reset to a low position for lifting preparation, which can reduce the time wasted in resetting the lifting shell and improve work efficiency.

[0021] 2. After the lifting shell of the induced draft fan upper cover hoisting device is moved up to the position, the stop block will press the stop block into the first cavity, thereby releasing the limit on the sliding sleeve, and the sliding sleeve can be slid, so as to facilitate the horizontal movement of the induced draft fan upper cover, and facilitate the adjustment of the unloading position of the induced draft fan upper cover.

[0022] 3. The induced draft fan upper cover hoisting device can release the limit of the wedge block by rotating the rotating rod, that is, the wedge block can be pulled forward and pulled out of the wedge groove, so that it is convenient to replace the hoisting shells of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural schematic diagram of an induced draft fan upper cover hoisting device proposed by the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0025] Figure 3 for Figure 1 A rear view structural diagram of ;

[0026] Figure 4 for Figure 2 A magnified view of the structure of part A;

[0027] Figure 5 for Figure 2 A magnified view of the structure of part B;

[0028] Figure 6 for Figure 1 A three-dimensional diagram of the connection structure between the middle sliding sleeve and the cross bar.

[0029] In the figure: 1 U-shaped frame, 2 cross bar, 3 sliding sleeve, 4 lifting shell, 5 motor, 6 anti-dropping block, 7 screw rod, 8 slider, 9 worm, 10 transmission wheel, 11 transmission belt, 12 worm wheel, 13 baffle bar, 14 rotating rod, 15 wedge block, 16 stop block, 17 torsion spring, 18 movable plate, 19 baffle block, 20 spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] See also Figure 1-6 A device for hoisting an upper cover of an induced draft fan comprises a U-shaped frame 1 and a screw rod 7. The inner walls of both sides of the U-shaped frame 1 are provided with slide grooves. The screw rod 7 is rotatably arranged inside the corresponding slide grooves. Counterweight plates are arranged at both ends of the lower side of the U-shaped frame 1 to improve the stability of the device. The rod wall of the screw rod 7 is threadedly sleeved with a slider 8. The upper ends of the two screw rods 7 are fixedly sleeved with a worm gear 12. The inner sides of the upper ends of the slide grooves are rotatably provided with worms 9. The worms 9 on both sides are meshed and connected with the corresponding worm gears 12. A horizontal Rod 2, the movable sleeve of the rod wall of the cross bar 2 is provided with a sliding sleeve 3, the longitudinal sections of the sliding sleeve 3 and the cross bar 2 are both rectangular, so that the sliding sleeve 3 cannot rotate, that is, it can slide stably, and the side of the cross bar 2 away from the slider 8 is fixedly provided with an anti-slip block 6 to prevent the sliding sleeve 3 from slipping off from the end of the cross bar 2 as much as possible, and a first cavity is opened inside the cross bar 2, and a lifting shell 4 is set on the upper side of the sliding sleeve 3, and a wedge-shaped groove is opened on the upper side of the sliding sleeve 3, and a wedge-shaped block 15 is slidably set inside the wedge groove, and the upper side of the wedge block 15 is fixedly connected to the lifting shell 4.

[0033] Embodiment 2

[0034] See also Figure 1-6A transmission mechanism for driving two worm gears 9 to rotate synchronously is arranged on both sides of the upper end of the U-shaped frame 1. The transmission mechanism includes a transmission wheel 10 and a motor 5. The two transmission wheels 10 are arranged at both ends of the rear side of the U-shaped frame 1. The rear ends of the two worm gears 9 extend to the outside of the U-shaped frame 1. The two transmission wheels 10 are fixedly sleeved with the rear ends of the corresponding worm gears 9. The two transmission wheels 10 are connected by a transmission belt 11. A motor 5 is fixedly arranged on the front side of the upper end of the U-shaped frame 1, and the output end of the motor 5 is fixedly connected to one end of the corresponding worm gear 9.

[0035] Embodiment 3

[0036] See also Figure 1-6 A first limiting mechanism for limiting the movement of the sliding sleeve 3 relative to the cross bar 2 is arranged inside the first cavity. The first limiting mechanism includes a movable plate 18 and a stopper 19. The movable plate 18 is slidably arranged inside the first cavity. Two stoppers 19 are arranged on both sides of the sliding sleeve 3. The lower ends of the two stoppers 19 extend into the first cavity. The lower ends of the two stoppers 19 are fixedly connected to one end of the corresponding movable plate 18. Springs 20 are fixedly arranged on both sides of the lower surface of the movable plate 18. The other end of the spring 20 is fixedly connected to the inner wall of the first cavity. The cross-sections of the movable plate 18 and the first cavity are both rectangular, so that the movable plate 18 cannot rotate, that is, it can slide stably. The inner walls on both sides of the upper end of the U-shaped frame 1 and the positions corresponding to the stoppers 19 are fixedly provided with stoppers 16, which can press the corresponding stoppers 19 into the first cavity.

[0037] Embodiment 4

[0038] See also Figure 1-6 A second limiting mechanism for limiting the movement of the wedge block 15 is arranged on both sides of the sliding sleeve 3. The second limiting mechanism includes a rotating rod 14 and a blocking bar 13. A second cavity is opened in the middle of the sliding sleeve 3 and located at the lower side of the wedge groove. The rotating rod 14 is penetrated inside the second cavity. Both ends of the rotating rod 14 are rotatably connected to the inner wall of the second cavity. Two blocking bars 13 are arranged on both sides of the sliding sleeve 3 to abut against each other. One end of the two blocking bars 13 is fixedly sleeved with one end of the corresponding rotating rod 14, and the other end of the two blocking bars 13 abuts against one side of the corresponding wedge block 15.

[0039] Embodiment 5

[0040] See also Figure 1-6 A torsion spring 17 is provided on the movable sleeve of the rod wall of the rotating rod 14, and the two ends of the torsion spring 17 are fixedly connected to the corresponding rotating rod 14 and the inner wall of the second cavity respectively. In a natural state, the elastic force of the torsion spring 17 will cause the rotating rod 14 to drive the two side baffles 13 to rotate until they are in conflict with one side of the corresponding wedge block 15.

[0041] In summary, when the induced draft fan upper cover lifting device is in use, the motor 5 drives the worm 9 on one side to rotate, and the transmission wheel 10 and the transmission belt 11 drive the worm 9 on the other side to rotate, that is, the two worms 9 drive the corresponding worm wheels 12 to rotate, and then the screw rods 7 on both sides rotate in the opposite direction, and then the sliders 8 on both sides move in the opposite direction, that is, when the lifting shell 4 on one side moves up to lift the induced draft fan upper cover, the lifting shell 4 on the other side moves down to reset to a lower position for lifting preparation, which can reduce the time wasted in resetting the lifting shell, and can The working efficiency can be improved. After the lifting shell 4 moves up into position, the stop block 16 will press the stop block 19 into the first cavity, thereby releasing the limit on the sliding sleeve 3, that is, the sliding sleeve 3 can be slid, which is convenient for horizontal movement of the upper cover of the induced draft fan, that is, it is convenient to adjust the unloading position of the upper cover of the induced draft fan, and the rotating rod 14 is rotated to make the baffles 13 on both sides rotate downward, which can release the limit on the wedge block 15, that is, the wedge block 15 can be pulled forward and pulled out of the wedge groove, which is convenient for replacing lifting shells 4 of different specifications.

[0042] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A induced draft fan upper cover hoisting device, comprising a U-shaped frame (1) and a screw rod (7), characterized in that: The inner walls of both sides of the U-shaped frame (1) are provided with sliding grooves, the screw rod (7) is rotatably arranged inside the corresponding sliding grooves, the rod wall of the screw rod (7) is threadedly sleeved with a slider (8), the upper ends of the two screw rods (7) are fixedly sleeved with a worm wheel (12), the inner sides of the upper ends of the sliding grooves are rotatably arranged with a worm (9), the worm rods (9) on both sides are meshedly connected with the corresponding worm wheel (12), the upper ends of the U-shaped frame (1) are provided with transmission mechanisms for driving the two worm rods (9) to rotate synchronously, and a cross bar (2) is fixedly arranged on one side of the slider (8). The movable sleeve of the rod wall of the cross bar (2) is provided with a sliding sleeve (3), a first cavity is provided inside the cross bar (2), a first limiting mechanism for limiting the movement of the sliding sleeve (3) relative to the cross bar (2) is provided inside the first cavity, a hanging shell (4) is provided on the upper side of the sliding sleeve (3), a wedge-shaped groove is provided on the upper side of the sliding sleeve (3), a wedge-shaped block (15) is slidably provided inside the wedge-shaped groove, the upper side of the wedge-shaped block (15) is fixedly connected to the hanging shell (4), and second limiting mechanisms for limiting the movement of the wedge-shaped block (15) are provided on both sides of the sliding sleeve (3).

2. The induced draft fan upper cover hoisting device according to claim 1, characterized in that: The transmission mechanism comprises a transmission wheel (10) and a motor (5); the two transmission wheels (10) are arranged at both ends of the rear side of the U-shaped frame (1); the rear ends of the two worms (9) extend to the outside of the U-shaped frame (1); the two transmission wheels (10) are fixedly sleeved with the rear ends of the corresponding worms (9); the two transmission wheels (10) are connected by transmission belts (11); the motor (5) is fixedly arranged on the front side of the upper end of the U-shaped frame (1); and the output end of the motor (5) is fixedly connected to one end of the corresponding worm (9).

3. The induced draft fan upper cover hoisting device according to claim 1, characterized in that: The first limiting mechanism comprises a movable plate (18) and a stopper (19); the movable plate (18) is slidably arranged inside the first cavity; the two stoppers (19) are arranged to abut against each other on both sides of the sliding sleeve (3); the lower ends of the two stoppers (19) extend into the first cavity; the lower ends of the two stoppers (19) are fixedly connected to one end of the corresponding movable plate (18); springs (20) are fixedly arranged on both sides of the lower surface of the movable plate (18); the other end of the spring (20) is fixedly connected to the inner wall of the first cavity.

4. The induced draft fan upper cover hoisting device according to claim 1, characterized in that: The second limiting mechanism comprises a rotating rod (14) and a blocking bar (13); a second cavity is provided in the middle of the sliding sleeve (3) and at the lower side of the wedge-shaped groove; the rotating rod (14) is inserted into the interior of the second cavity; both ends of the rotating rod (14) are rotatably connected to the inner wall of the second cavity; two blocking bars (13) are arranged to abut against each other on both sides of the sliding sleeve (3); one end of the two blocking bars (13) is fixedly sleeved with one end of the corresponding rotating rod (14); and the other end of the two blocking bars (13) abuts against one side of the corresponding wedge-shaped block (15).

5. The induced draft fan upper cover hoisting device according to claim 4, characterized in that: A torsion spring (17) is movably sleeved on the rod wall of the rotating rod (14), and two ends of the torsion spring (17) are respectively fixedly connected to the corresponding rotating rod (14) and the inner wall of the second cavity.

6. The induced draft fan upper cover hoisting device according to claim 3, characterized in that: The cross sections of the movable plate (18) and the first cavity are both rectangular.

7. The induced draft fan upper cover hoisting device according to claim 3, characterized in that: Stop blocks (16) are fixedly provided on the inner walls of both sides of the upper end of the U-shaped frame (1) and at positions corresponding to the stop blocks (19).

8. The induced draft fan upper cover hoisting device according to claim 1, characterized in that: The longitudinal sections of the sliding sleeve (3) and the cross bar (2) are both rectangular.

9. The induced draft fan upper cover hoisting device according to claim 1, characterized in that: Counterweight plates are provided at both ends of the lower side of the U-shaped frame (1).

10. The induced draft fan upper cover hoisting device according to claim 1, characterized in that: An anti-drop block (6) is fixedly provided on one side of the cross bar (2) away from the slide block (8).

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