An energy-saving coal-fired hot blast stove

Abstract

The present invention provides an energy-saving coal-fired hot blast stove, which relates to the technical field of coal-fired hot blast stoves. The present invention includes a main body, and a heat exchange device is fixedly connected to the upper end of the main body. A combustion chamber and an ash chamber are arranged inside the main body. A movable door is slidably connected to the front side surfaces of the combustion chamber and the ash chamber. A coal leakage device is arranged on the inner surface of the combustion chamber. An inclined panel is fixedly connected to the inner surface of the ash chamber at the left end. A housing is fixedly connected to the right end of the main body. By adjusting the proportion of the moving block in the temporary storage box, the effect of adjusting the coal consumption is achieved, preventing excessive coal from being put in during use and causing waste of coal due to excessive firepower. By setting the support block and the opening and closing plate, the effect of continuously and intermittently feeding coal is achieved, saving the use of coal. By setting the cooperation of the toothed plate and the eccentric wheel, while pushing the coal, the ash leakage sieve plate is vibrated to shake the coal ash into the ash chamber, cleaning the coal ash accumulated in the gaps of the ash leakage sieve plate, and improving the combustion efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coal-fired hot blast stoves, and particularly to an energy-saving coal-fired hot blast stove. Background Art

[0002] Silica white is the general term for white powdery X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica and ultrafine silica gel, and also including powdery synthetic aluminosilicate and calcium silicate, etc. Silica white is a porous substance, and its composition can be expressed as SiO2·nH2O, where nH2O exists in the form of surface hydroxyl groups. After the reaction for making silica white is completed, the liquid is washed, dehydrated by a filter press, and after obtaining a qualified silica white slurry by beating, it needs to be dried to obtain the silica white finished product.

[0003] Existing drying equipment heats the heat exchange pipes inside the hot blast stove by burning coal and then blows out the heated air to achieve the effect of blowing out hot air. For example, the invention patent application with the publication number CN111735203A discloses a heating hot blast stove. However, during the use of this kind of hot blast stove, coal residues will gradually accumulate on the ash leakage grate, which may cause the leakage holes to be blocked, thereby reducing the combustion efficiency or even causing the flameout. Moreover, for example, the invention patent application with the publication number CN103629813A discloses a coal-fired hot blast stove, which achieves the effect of automatically adding coal and saving labor costs. However, the number of coal blocks added is fixed, and when a lower temperature is required, it may cause heat surplus and result in resource waste. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides an energy-saving coal-fired hot blast stove, which solves the problems of blockage of leakage holes caused by the accumulation of coal residues on the ash leakage grate and the inability to adjust the amount of coal added.

[0006] (II) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: An energy-saving coal-fired hot blast stove, including a main body, a heat exchange device is fixedly connected to the upper end of the main body, a combustion chamber and an ash chamber are arranged inside the main body, a movable door is slidably connected to the front side surfaces of the combustion chamber and the ash chamber, a ash leakage device is arranged on the inner surface of the combustion chamber, an inclined panel is fixedly connected to the inner surface of the ash chamber at the left end, a housing is fixedly connected to the right end of the main body, a limiting device is arranged on the inner surface of the housing, an adjusting device is arranged on the housing above the limiting device, a hot air pipe is fixedly connected to the front side surface of the heat exchange device, a blowing device is fixedly connected to the left side surface of the heat exchange device, and an exhaust pipe is fixedly connected to the upper surface of the heat exchange device.

[0008] Preferably, the ash leakage device includes an ash leakage sieve plate, a connecting block, a connecting rod, an eccentric wheel, a pushing block, a toothed plate, and a cylinder. The ash leakage sieve plate is slidably connected to the inner surface of the combustion chamber. The connecting block is fixedly connected to the right surface of the ash leakage sieve plate. A first short rod is fixedly connected to the inner surface of the connecting block, and the left end of the connecting rod is movably connected to the inner surface of the connecting block through the first short rod.

[0009] Preferably, the right end of the connecting rod is fixedly connected to a second short rod. The connecting rod is movably connected to the side surface near the edge of the eccentric wheel through the second short rod. The eccentric wheel is rotatably connected to the inner surface of the main body. The cylinder is fixedly connected to the inner surface of the housing. The pushing block is slidably connected to the inner surface of the housing. The right end of the pushing block is fixedly connected to the output end of the cylinder. The toothed plate is fixedly connected to the lower surface of the pushing block.

[0010] Preferably, the limiting device includes an inclined plane block, an opening and closing door, a moving box, a limiting plate, a sliding rod, a spring, and a supporting block. The moving box is slidably connected to the inner surface of the housing. The limiting plate is fixedly connected to the side surface of the moving box. The sliding rod is fixedly connected to the upper surface of the limiting plate. The sliding rod is slidably connected to the inner surface of the housing. The spring is sleeved on the side surface of the sliding rod.

[0011] Preferably, the upper end of the spring is fixedly connected to the inner surface of the housing, and the lower end of the spring is fixedly connected to the upper surface of the limiting plate. The right end of the opening and closing door is fixedly connected to a first hinge. The opening and closing door is movably connected to the lower surface of the moving box through the first hinge. The inclined plane block is fixedly connected to the right side surface of the moving box. The inclined plane of the inclined plane block coincides with the inclined plane of the pushing block. The supporting block is fixedly connected to the inner surface of the moving box.

[0012] Preferably, the adjusting device includes a rotating handle, a bidirectional lead screw, a moving block, a temporary storage box, a fixing plate, a second hinge, an opening and closing plate, and a funnel. The temporary storage box is fixedly connected to the inner surface of the housing. The lower end of the funnel is fixedly connected to the upper surface of the temporary storage box. The funnel is in communication with the inside of the temporary storage box. The opening and closing plate is movably connected to the lower surface of the temporary storage box through the second hinge. The upper end of the moving box is slidably connected to the lower side surface of the temporary storage box.

[0013] Preferably, the second hinge is fixedly connected to the lower side surface of the temporary storage box. There are two moving blocks which are respectively slidably connected to the inner surfaces at both ends of the temporary storage box. The fixing plate is fixedly connected to the side surface of the moving block. The bidirectional lead screw is threadedly connected to the inner surface of the fixing plate. The bidirectional lead screw is rotatably connected to the inner surface of the housing. The rotating handle is fixedly connected to the front end of the bidirectional lead screw.

[0014] Working principle: Pull open the movable door 8 on the combustion chamber 11 and put in coal to ignite it. The heat is transferred to the heat exchange device 3 to heat the pipes therein. Then, turn on the blowing device 4 to blow air. The air exchanges heat through the pipes in the heat exchange device 3 and then hot air is blown out from the hot air pipe 10. When additional coal needs to be added later, start the cylinder 607 to drive the pushing block 605 to move. It moves to the lower part of the inclined block 701 through the inclined surfaces on the inclined block 701 and the pushing block 605. The inclined block 701 moves upward, causing the movable box 703 to move upward. The upward movement of the movable box 703 drives the support block 707 to move upward, thereby driving the opening and closing plate 507 to close the opening under the temporary storage box 504. Then, add coal from the funnel 508 into the temporary storage box 504 for temporary storage. When it is necessary to adjust the amount of coal used, the rotating handle 501 can be rotated to drive the bidirectional lead screw 502 to rotate. The bidirectional lead screw 502 is divided into two sections of threads with different thread directions. When the bidirectional lead screw 502 rotates, it drives the fixed plate 505 to move towards the middle of the bidirectional lead screw 502, thereby driving the moving block 503 to move towards the middle of the temporary storage box 504, adjusting the space inside the temporary storage box 504, and thus adjusting the amount of coal temporarily stored inside the temporary storage box 504. When the temporary storage box 504 is filled with coal, start the cylinder 607 to drive the pushing block 605 to move backward. At this time, the movable box 703 moves downward, driving the support block 707 to move downward, causing the opening and closing plate 507 to open. The coal in the temporary storage box 504 falls into the movable box 703. Then, start the cylinder 607 to push forward to drive the movable box 703 to move upward. The opening and closing door 702 opens due to its own gravity, and the coal falls into the housing 2. The pushing block 605 continues to move to close the opening and closing door 702. Then, push the coal to move onto the ash leakage sieve plate 601, and at the same time, push the burning coal to the left for a certain distance. The new coal and the old coal come into contact for ignition. When pushing the coal, the lower part of the toothed plate 606 moves to the upper surface of the eccentric wheel 604 for meshing, thereby driving the eccentric wheel 604 to rotate. The rotation of the eccentric wheel 604 drives the ash leakage sieve plate 601 to move left and right through the connecting rod 603 and the connecting block 602 to produce a vibrating effect. The burning coal ash falls into the ash chamber 12 through the gaps in the ash leakage sieve plate 601 for collection. The larger coal blocks pushed to one side fall into the ash chamber 12 through the larger gap between the combustion chamber 11 and the pushing block 605 after burning, preventing the larger coal cinders from stacking on the ash leakage sieve plate 601 to cause blockage. At this time, put the coal blocks into the funnel 508 again and they fall into the temporary storage box 504 for storage. The pushing block 605 moves to the right end of the inclined block 701 and then moves to the left again to repeat the operation.

[0015] (III) Beneficial effects

[0016] The present invention provides an energy-saving coal-fired hot blast stove. It has the following beneficial effects:

[0017] 1. By adjusting the proportion of the moving block in the temporary storage bin, the amount of coal used can be adjusted, preventing excessive coal from being put in during use and resulting in waste due to overly strong firepower.

[0018] 2. By setting the support block and the opening and closing plate, the effect of continuous intermittent coal feeding is achieved, saving the use of coal.

[0019] 3. By setting the cooperation of the toothed plate and the eccentric wheel, while pushing the coal, the ash leakage sieve plate is vibrated to shake the coal ash into the ash chamber, cleaning the coal ash accumulated in the gaps of the ash leakage sieve plate and improving the combustion efficiency.

[0020] 4. When the pushing block pushes the coal block, the coal that is almost burned out is pushed towards the edge of the ash leakage sieve plate. After repeating many times, the larger coal cinders fall from the edge of the ash leakage sieve plate into the ash chamber, preventing a large amount of coal cinders from accumulating on the ash leakage sieve plate and causing poor combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an energy-saving coal-fired hot blast stove proposed by the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 1 ;

[0023] Figure 3 It is a schematic diagram of the internal structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 2 ;

[0024] Figure 4 It is a schematic diagram of the ash leakage device structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 1 ;

[0025] Figure 5 It is a schematic diagram of the ash leakage device structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 2 ;

[0026] Figure 6 It is a schematic diagram of the limit device structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 1 ;

[0027] Figure 7 It is a schematic diagram of the limit device structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 2 ;

[0028] Figure 8 It is a schematic diagram of the adjustment device structure of an energy-saving coal-fired hot blast stove proposed by the present invention Figure 1 ;

[0029] Figure 9Schematic structure diagram of an adjustment device for an energy-saving coal-fired hot blast stove proposed by the present invention Figure 2 ;

[0030] Figure 10 Schematic structure diagram of an adjustment device for an energy-saving coal-fired hot blast stove proposed by the present invention Figure 3 。

[0031] Among them, 1. Main body; 2. Shell; 3. Heat exchange equipment; 4. Blowing equipment; 5. Adjustment device; 501. Rotating handle; 502. Bi-directional lead screw; 503. Moving block; 504. Temporary storage box; 505. Fixed plate; 506. Second hinge; 507. Opening and closing plate; 508. Hopper; 6. Ash leakage device; 601. Ash leakage sieve plate; 602. Connecting block; 603. Connecting rod; 604. Eccentric wheel; 605. Pushing block; 606. Rack; 607. Cylinder; 7. Limiting device; 701. Inclined plane block; 702. Opening and closing door; 703. Moving box; 704. Limiting plate; 705. Slide bar; 706. Spring; 707. Support block; 8. Moving door; 9. Smoke exhaust pipe; 10. Hot air pipe; 11. Combustion chamber; 12. Ash chamber; 13. Inclined panel. Specific implementation manner

[0032] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Such as Figures 1-10As shown in the figure, an embodiment of the present invention provides an energy-saving coal-fired hot blast stove, which includes a main body 1. A heat exchange device 3 is fixedly connected to the upper end of the main body 1. A combustion chamber 11 and an ash chamber 12 are arranged inside the main body 1. A movable door 8 is slidably connected to the front side surfaces of the combustion chamber 11 and the ash chamber 12. A dust leakage device 6 is arranged on the inner surface of the combustion chamber 11. An inclined panel 13 is fixedly connected to the inner surface of the ash chamber 12 at the left end. A housing 2 is fixedly connected to the right end of the main body 1. A limiting device 7 is arranged on the inner surface of the housing 2. An adjusting device 5 is arranged on the upper end of the housing 2 where the limiting device 7 is located. A hot air pipe 10 is fixedly connected to the front side surface of the heat exchange device 3. A blowing device 4 is fixedly connected to the left side surface of the heat exchange device 3. A smoke exhaust pipe 9 is fixedly connected to the upper surface of the heat exchange device 3. The heat exchange device 3 is an existing device, and a ventilation duct is arranged inside. The heat generated inside the combustion chamber 11 heats the ventilation duct in the heat exchange device 3, causing the air inside the duct to be heated. Then, the blowing device 4 blows air into the duct, and the hot air is blown out from the hot air pipe 10 after passing through the duct. The blowing device 4 is an existing device. The smoke exhaust pipe 9 is similar to the effect of a chimney for the ventilation duct in the combustion chamber 11. When it is necessary to clean the ash in the ash chamber 12, the ash can be scraped out by manually holding a scraper.

[0034] The dust leakage device 6 includes a dust leakage sieve plate 601, a connecting block 602, a connecting rod 603, an eccentric wheel 604, a pushing block 605, a toothed plate 606, and a cylinder 607. The dust leakage sieve plate 601 is slidably connected to the inner surface of the combustion chamber 11. The connecting block 602 is fixedly connected to the right side surface of the dust leakage sieve plate 601. A first short rod is fixedly connected to the inner surface of the connecting block 602. The left end of the connecting rod 603 is movably connected to the inner surface of the connecting block 602 through the first short rod. The right end of the connecting rod 603 is fixedly connected to a second short rod. The connecting rod 603 is movably connected to the side surface near the edge of the eccentric wheel 604 through the second short rod. The eccentric wheel 604 is rotatably connected to the inner surface of the main body 1. The cylinder 607 is fixedly connected to the inner surface of the housing 2. The pushing block 605 is slidably connected to the inner surface of the housing 2. The right end of the pushing block 605 is fixedly connected to the output end of the cylinder 607. The toothed plate 606 is fixedly connected to the lower side surface of the pushing block 605.

[0035] The new carbon and the old carbon come into contact and are ignited. When the coal is pushed, the lower part of the tooth plate 606 moves to the upper surface of the eccentric wheel 604 for meshing, thereby driving the eccentric wheel 604 to rotate. The eccentric wheel 604 rotates, and drives the ash leakage screen plate 601 to move left and right through the connecting rod 603 and the connecting block 602 to produce a vibration effect. The burned coal ash falls from the gap of the ash leakage screen plate 601 into the ash chamber 12 for collection through the vibration. After the larger coal blocks pushed aside are burned, they are pushed by the later coal blocks to fall into the larger gap between the combustion chamber 11 and the pushing block 605 into the ash chamber 12, preventing larger coal cinders from stacking on the ash leakage screen plate 601 and causing blockage. At this time, the coal blocks are put into the funnel 508 again and dropped into the temporary storage box 504 for storage.

[0036] When the tooth plate 606 is engaged with the eccentric wheel 604, the left end of the tooth plate 606 stops moving when it moves to a position close to the side of the ash leakage screen plate 601. The cylinder 607 is an existing device that drives the piston therein to work by delivering gas. The cylinder 607 can also be replaced by other devices that can drive the push block 605 to move, such as an electric push rod.

[0037] The limiting device 7 includes an inclined block 701, an opening and closing door 702, a moving box 703, a limiting plate 704, a sliding rod 705, a spring 706 and a supporting block 707. The moving box 703 is slidably connected to the inner surface of the shell 2, the limiting plate 704 is fixedly connected to the side surface of the moving box 703, the sliding rod 705 is fixedly connected to the upper surface of the limiting plate 704, the sliding rod 705 is slidably connected to the inner surface of the shell 2, the spring 706 is sleeved on the side surface of the sliding rod 705, the upper end of the spring 706 is fixedly connected to the inner surface of the shell 2, and the spring 706 is sleeved on the side surface of the sliding rod 705. The lower end of the spring 706 is fixedly connected to the upper surface of the limit plate 704, the right end of the opening and closing door 702 is fixedly connected to the first hinge, the opening and closing door 702 is movably connected to the lower surface of the moving box 703 through the first hinge, the inclined block 701 is fixedly connected to the right side surface of the moving box 703, the inclined surface of the inclined block 701 coincides with the inclined surface of the pushing block 605, the supporting block 707 is fixedly connected to the inner surface of the moving box 703, and when the pushing block 605 moves to the bottom of the inclined block 701, the opening and closing door 702 opens due to its own weight and the coal falls out.

[0038] When coal needs to be added, the cylinder 607 is started to drive the push block 605 to move, and the inclined surface on the inclined surface block 701 and the push block 605 moves to the bottom of the inclined surface block 701. The inclined surface block 701 moves upward, causing the moving box 703 to move upward. The moving box 703 moves upward, driving the support block 707 to move upward, thereby driving the opening and closing plate 507 to close the opening below the temporary storage box 504, and then the coal is added from the funnel 508 to the temporary storage box 504 for temporary storage.

[0039] When the temporary storage box 504 is filled with coal, start the cylinder 607 to drive the pushing block 605 to move backward. At this time, the moving box 703 moves downward, driving the supporting block 707 to move downward, causing the opening and closing plate 507 to open. The coal in the temporary storage box 504 falls into the moving box 703. Then, start the cylinder 607 to push forward, driving the moving box 703 to move upward. The opening and closing door 702 opens due to its own gravity, and the coal falls into the housing 2. The pushing block 605 continues to move to close the opening and closing door 702, and then pushes the coal to move onto the ash leakage sieve plate 601.

[0040] The adjusting device 5 includes a rotating handle 501, a bidirectional lead screw 502, moving blocks 503, a temporary storage box 504, a fixing plate 505, a second hinge 506, an opening and closing plate 507, and a funnel 508. The temporary storage box 504 is fixedly connected to the inner surface of the housing 2. The lower end of the funnel 508 is fixedly connected to the upper surface of the temporary storage box 504. The funnel 508 communicates with the inside of the temporary storage box 504. The opening and closing plate 507 is movably connected to the lower surface of the temporary storage box 504 through the second hinge 506. The upper end of the moving box 703 is slidably connected to the lower side surface of the temporary storage box 504. The second hinge 506 is fixedly connected to the lower side surface of the temporary storage box 504. There are two moving blocks 503, which are respectively slidably connected to the inner surfaces at both ends of the temporary storage box 504. The fixing plate 505 is fixedly connected to the side surface of the moving block 503. The bidirectional lead screw 502 is threadedly connected to the inner surface of the fixing plate 505. The bidirectional lead screw 502 is rotatably connected to the inner surface of the housing 2. The rotating handle 501 is fixedly connected to the front end of the bidirectional lead screw 502. The surface of the bidirectional lead screw 502 is divided into two sections of threads, and the directions of the two sections of threads are different. When the bidirectional lead screw 502 rotates, it drives the two moving blocks 503 to move in different directions.

[0041] When it is necessary to adjust the amount of coal used, the rotating handle 501 can be rotated to drive the bidirectional lead screw 502 to rotate. The bidirectional lead screw 502 is divided into two sections of threads, and the directions of the threads are different. When the bidirectional lead screw 502 rotates, it drives the fixing plate 505 to move towards the middle of the bidirectional lead screw 502, thereby driving the moving blocks 503 to move towards the middle of the temporary storage box 504 to adjust the space inside the temporary storage box 504.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and deformations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving coal-fired hot air stove, comprising a main body, characterized in that: The upper end of the main body is fixedly connected with a heat exchange device, a combustion chamber and an ash chamber are arranged on the inner side of the main body, a movable door is slidably connected to the front surfaces of the combustion chamber and the ash chamber, an ash leakage device is arranged on the inner surface of the combustion chamber, an inclined panel is fixedly connected to the inner surface of the ash chamber at the left end, the right end of the main body is fixedly connected with a shell, a limiting device is arranged on the inner surface of the shell, and an adjusting device is arranged on the upper end of the shell at the limiting device, a hot air pipe is fixedly connected to the front surface of the heat exchange device, a blowing device is fixedly connected to the left surface of the heat exchange device, and a smoke exhaust pipe is fixedly connected to the upper surface of the heat exchange device; The ash leakage device comprises an ash leakage screen plate, a connecting block, a connecting rod, an eccentric wheel, a pushing block, a tooth plate and a cylinder. The ash leakage screen plate is slidably connected to the inner surface of the combustion chamber, the connecting block is fixedly connected to the right side surface of the ash leakage screen plate, the inner surface of the connecting block is fixedly connected to a first short rod, and the left end of the connecting rod is movably connected to the inner surface of the connecting block through the first short rod; The right end of the connecting rod is fixedly connected with a second short rod, the connecting rod is movably connected to the side surface of the eccentric wheel near the edge through the second short rod, the eccentric wheel is rotatably connected to the inner surface of the main body, the cylinder is fixedly connected to the inner surface of the shell, the push block is slidably connected to the inner surface of the shell, the right end of the push block is fixedly connected to the output end of the cylinder, and the tooth plate is fixedly connected to the lower surface of the push block; The limiting device includes an inclined block, an opening and closing door, a moving box, a limiting plate, a sliding rod, a spring and a supporting block. The moving box is slidably connected to the inner surface of the shell, the limiting plate is fixedly connected to the side surface of the moving box, the sliding rod is fixedly connected to the upper surface of the limiting plate, the sliding rod is slidably connected to the inner surface of the shell, and the spring is sleeved on the side surface of the sliding rod; The upper end of the spring is fixedly connected to the inner surface of the shell, the lower end of the spring is fixedly connected to the upper surface of the limit plate, the right end of the opening and closing door is fixedly connected to the first hinge, the opening and closing door is movably connected to the lower surface of the moving box through the first hinge, the inclined surface block is fixedly connected to the right side surface of the moving box, the inclined surface of the inclined surface block is matched with the inclined surface of the push block, and the support block is fixedly connected to the inner surface of the moving box; The adjusting device includes a rotating handle, a bidirectional screw rod, a moving block, a temporary storage box, a fixed plate, a second hinge, an opening and closing plate and a funnel. The temporary storage box is fixedly connected to the inner surface of the shell, the lower end of the funnel is fixedly connected to the upper surface of the temporary storage box, the funnel is connected to the interior of the temporary storage box, the opening and closing plate is movably connected to the lower surface of the temporary storage box through the second hinge, and the upper end of the moving box is slidably connected to the lower surface of the temporary storage box.

2. An energy-saving coal-fired hot air stove according to claim 1, characterized in that: The second hinge is fixedly connected to the lower surface of the temporary storage box, two moving blocks are provided and are slidably connected to the inner surfaces of the two ends of the temporary storage box respectively, the fixed plate is fixedly connected to the side surface of the moving block, the bidirectional screw is threadedly connected to the inner surface of the fixed plate, the bidirectional screw is rotatably connected to the inner surface of the shell, and the rotating handle is fixedly connected to the front end of the bidirectional screw.

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