Lime kiln tail gas carbon dioxide concentration increasing device

Abstract

The invention relates to the field of lime kiln tail gas treatment, in particular to a lime kiln tail gas carbon dioxide concentration increasing device which comprises a lime kiln body flue gas dust remover, the lime kiln body flue gas dust remover comprises an external mounting part, an internal mounting part is arranged in the external mounting part, and a cleaning part is arranged in the external mounting part. The cleaning part comprises four torsion cylinders, synchronous sleeves are fixedly connected to the bottoms of the four torsion cylinders, inner clamping grooves are formed in the four synchronous sleeves, a dust removal part is arranged in the exterior part and comprises four dust removal cloth bags, and dust scraping plates are driven by the synchronous sleeves to scrape the inner walls of the dust removal cloth bags. According to the dust collection device, the attached dust is scraped off, meanwhile, the scraped dust is sucked into the dust suction cylinder and discharged to a designated dust collection device through the external connection cylinder, secondary flying of the dust in the device is prevented, and the situation that normal use is affected due to the fact that a filtering dust cake layer composed of lime dust is formed on the surface of the dust collection bag is avoided.

Description

Technical Field

[0001] The present invention relates to the field of lime kiln tail gas treatment, in particular to a device for increasing the carbon dioxide concentration of lime kiln tail gas. Background Art

[0002] Carbon dioxide is a very valuable carbon resource and is widely used in many fields such as food, industry, medicine, agriculture, environmental protection, energy and scientific research. It is an indispensable chemical substance. Lime kiln is the main production equipment of lime. During the lime production process, limestone is mainly decomposed at high temperature to produce quicklime and carbon dioxide. Recycling this carbon dioxide can help reduce greenhouse gas emissions. However, due to the low concentration of carbon dioxide in the exhaust gas of the lime kiln, the cost-effectiveness of recycling is low, so most companies have to give up recycling. In the current lime production process, the supply of various energy media still adopts traditional atmospheric mechanical suction and is sent into the lime kiln through a blower. The inhaled atmosphere will increase the total amount of lime kiln exhaust, thereby diluting the carbon dioxide concentration, and also causing energy waste.

[0003] In the traditional lime production process, the exhaust gas generated during the calcination of limestone contains a large amount of lime dust. At present, the industry generally uses bag dust removal equipment as the core dust removal equipment. Its working principle is based on the surface filtration mechanism, which uses fiber filter materials to intercept dust particles. The bag opening is opposite to the exhaust gas discharge path, so that when the dust-containing exhaust gas passes through the bag, the dust with a particle size larger than the filter hole is retained inside the bag, and the dust with a smaller particle size adheres to the surface of the bag, thereby realizing gas-solid separation. The traditional air blowing cleaning method cannot effectively blow out the dust accumulated inside the bag. As the operating time increases, a filter dust cake layer composed of lime dust gradually forms on the surface of the bag. As the dust cake layer continues to thicken, the porosity of the bag decreases rapidly, affecting its normal use and greatly increasing operation and maintenance costs and downtime frequency. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for increasing the carbon dioxide concentration in lime kiln tail gas, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for increasing the carbon dioxide concentration of lime kiln exhaust gas, comprising a lime kiln body flue gas dust collector, the lime kiln body flue gas dust collector comprising an external part, an internal part is provided inside the external part, a cleaning part is provided inside the external part, the cleaning part comprises four torsion cylinders, the bottoms of the four torsion cylinders are fixedly connected to synchronous sleeves, the interiors of the four synchronous sleeves are provided with internal card grooves, the interiors of the four synchronous sleeves are fixedly plugged with two scraping plates in accordance with the corresponding internal card grooves, a dust removal part is provided inside the external part, the dust removal part comprises four dust removal bags, the four dust removal bags are fixedly connected with docking end plates, the center positions of the four docking end plates are provided with ball slots, and the four ball slots are movably connected with movable ball heads.

[0006] Preferably, a heat exchanger is fixed to the tail of the lime kiln body flue gas dust collector, the heat exchanger is connected to a cooling blower, the lime kiln body flue gas dust collector is connected to a lime kiln body dust removal fan, and the lime kiln body dust removal fan is connected to an exhaust pipe.

[0007] Preferably, the exterior portion includes a bottom mounting frame, the bottom of the bottom mounting frame is provided with four supporting legs distributed in an array, the interior of the bottom mounting frame is a cavity structure, an air inlet cylinder is fixedly connected to the outer wall of the bottom mounting frame, the air inlet cylinder is kept connected to the cavity part of the bottom mounting frame, and an air outlet cylinder is fixedly connected to the outer wall of the bottom mounting frame, the air outlet cylinder is kept connected to the cavity part of the bottom mounting frame.

[0008] Preferably, the top of the bottom mounting frame is fixedly connected to a top mounting frame, the interior of the top mounting frame is a cavity structure, the top mounting frame is connected to the cavity portion of the bottom mounting frame, a rectangular through hole is opened on the outer wall of the top mounting frame, the top of the top mounting frame is fixedly connected to a top protective frame, and the interiors of the top mounting frame and the bottom mounting frame are respectively fixedly connected to internal frames.

[0009] Preferably, the interior part includes two interior panels, which are distributed up and down, and are respectively fixed to the corresponding interior frames. The two interior panels are respectively provided with four circumferentially distributed docking screw holes, and the interiors of the eight docking screw holes are all threadedly connected to connecting tubes. The outer walls of the eight connecting tubes are provided with hexagonal protrusions for auxiliary adjustment. A control motor is fixed to the bottom center position of the upper interior panel, and the motor shaft of the control motor is connected to a driving gear.

[0010] Preferably, the four torsion cylinders are rotatably connected to the corresponding four upper connecting cylinders, the four torsion cylinders are kept coaxial with the corresponding connecting cylinders, and the four synchronization sleeves are kept coaxial with the corresponding connecting cylinders.

[0011] Preferably, synchronous gears are fixed to the outer walls of the four torsion cylinders, and the four synchronous gears are connected to the driving gears through latches. A dust extraction cylinder is fixed to the interior of the top mounting frame, and the interior of the dust extraction cylinder is set as a cavity structure. Four axial holes are provided on the top of the dust extraction cylinder, and the axial holes of the dust extraction cylinder are all coaxial with the corresponding docking screw holes.

[0012] Preferably, four docking tubes are fixedly connected to the bottom of the dust extraction tube, and the four docking tubes are all coaxial with the corresponding axial holes on the dust extraction tube, the four docking tubes are all coaxial with the corresponding connecting tubes, and the four docking tubes are all rotationally connected with the corresponding torsion tubes. An external connecting tube is fixedly connected to the outer wall of the dust extraction tube, and the external connecting tube is fixedly inserted in the rectangular through hole of the top mounting frame.

[0013] Preferably, the four dust bags are all fixedly connected in the corresponding connecting tubes below, the four docking end plates are all coaxial with the corresponding connecting tubes, four adjusting cylinders are fixedly connected to the top of the top mounting frame, the telescopic shafts of the four adjusting cylinders are all movably inserted into the corresponding axial holes of the dust extraction tube, and the telescopic shafts of the four adjusting cylinders are all fixedly connected to the corresponding movable ball heads.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Connect the cooling blower to the outlet pipe of the lime kiln flue gas dust collector. After the lime kiln tail gas is purified by the lime kiln flue gas dust collector, it is discharged into the atmosphere through the exhaust pipe under the action of the lime kiln dust removal fan. In this process, a part of the purified flue gas is first cooled by the heat exchanger, and then enters the lime kiln through the cooling blower to cool the calcined lime. At the same time, the hot water after heat exchange can also provide heat for the heating system. Such a cycle not only reduces the total amount of lime kiln tail gas, but also increases the carbon dioxide concentration of the lime kiln tail gas, and can also reuse the lost heat, realizing the secondary utilization of energy.

[0016] 2. The cleaning part is innovatively designed. After the control motor is started, the motor shaft drives the driving gear to rotate. Since the synchronous gears on the outer walls of the four torsion cylinders are connected to the driving gear teeth, the four torsion cylinders can rotate synchronously and stably. The synchronous sleeve connected to the bottom of the torsion cylinder will rotate with the torsion cylinder, thereby driving the scraper fixed in the inner slot to comprehensively clean the inner wall of the dust bag. At the same time, the external cylinder is connected to the external exhaust equipment to facilitate the formation of suction in the synchronous sleeve to extract the removed dust and prevent it from being retained inside the device. Compared with traditional cleaning methods, this design can more efficiently remove lime dust attached to the inner wall of the bag and prevent bag clogging caused by dust accumulation. Continuous and stable cleaning operations can keep the dust bag in good air permeability, ensure that the dust removal efficiency is maintained at a high level for a long time, effectively extend the continuous operation time of the equipment, and reduce the number of maintenance shutdowns due to untimely cleaning.

[0017] 3. A heat exchanger is connected to the tail end of the lime kiln flue gas dust collector to preheat the air transported by the cooling blower using the waste heat of the lime kiln exhaust. The heat of the high-temperature exhaust is transferred to the cold air, which increases the temperature of the cold air before entering the system to participate in related process. This preheated air can reduce the energy consumption required for subsequent heating, avoid energy waste, and fully utilize the lime kiln exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional assembly structure of the present invention;

[0019] Figure 2 This is a bottom-up structural diagram of the three-dimensional assembly of the present invention;

[0020] Figure 3 It is a schematic diagram of the decomposition structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the exploded bottom view structure of the present invention;

[0022] Figure 5 It is a partial cross-sectional structural diagram of the dust removal state of the flue gas dust collector of the lime kiln body of the present invention;

[0023] Figure 6 For the present invention Figure 5 The enlarged structural diagram of part A is shown;

[0024] Figure 7 It is a partial cross-sectional structural schematic diagram of the lime kiln main body flue gas dust collector in the cleaning state of the present invention;

[0025] Figure 8 For the present invention Figure 7 The enlarged structural diagram of part B is shown;

[0026] Figure 9 This is a schematic diagram of the exterior assembly structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the interior assembly structure of the present invention;

[0028] Figure 11 This is a schematic diagram of the assembly structure of the cleaning part of the present invention;

[0029] Figure 12 It is a schematic diagram of the dust removal assembly structure of the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0031] 1. Lime kiln flue gas dust collector; 2. Heat exchanger; 3. Cooling blower; 4. Lime kiln dust removal fan; 5. Exhaust pipe; 6. External parts; 601. Bottom mounting frame; 602. Air inlet pipe; 603. Air outlet pipe; 604. Top mounting frame; 605. Top protection frame; 606. Internal frame; 7. Internal parts; 701. Internal panel; 702. Docking screw hole; 703. Connecting tube; 704. Control motor; 705, drive gear; 8, cleaning unit; 801, torsion cylinder; 802, synchronization sleeve; 803, inner slot; 804, scraper plate; 805, synchronization gear; 806, dust extraction cylinder; 807, docking cylinder; 808, external cylinder; 9, dust removal unit; 901, dust bag; 902, docking end plate; 903, ball slot; 904, movable ball head; 905, adjustment cylinder. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1 - Figure 12A device for increasing the carbon dioxide concentration of lime kiln exhaust gas includes a lime kiln body flue gas dust collector 1, the lime kiln body flue gas dust collector 1 includes an outer part 6, an inner part 7 is provided inside the outer part 6, a cleaning part 8 is provided inside the outer part 6, the cleaning part 8 includes four torsion cylinders 801, the bottoms of the four torsion cylinders 801 are fixedly connected with synchronous sleeves 802, the interiors of the four synchronous sleeves 802 are provided with internal card grooves 803, the interiors of the four synchronous sleeves 802 are fixedly plugged with two scraping plates 804 in the corresponding internal card grooves 803, a dust removal part 9 is provided inside the outer part 6, the dust removal part 9 includes four dust removal bags 901, the four dust removal bags 901 are fixedly connected with docking end plates 902, the center positions of the four docking end plates 902 are provided with ball slots 903, and the four ball slots 903 are movably connected with movable ball heads 904.

[0034] The tail of the lime kiln flue gas dust collector 1 is fixedly connected with a heat exchanger 2, the heat exchanger 2 is connected with a cooling blower 3, the lime kiln flue gas dust collector 1 is connected with a lime kiln dust removal fan 4, and the lime kiln dust removal fan 4 is connected with an exhaust pipe 5.

[0035] In this embodiment, the cooling blower 3 is connected to the outlet pipe of the lime kiln main body flue gas dust collector 1. After the lime kiln exhaust gas is purified by the lime kiln main body flue gas dust collector 1, it is discharged into the atmosphere through the exhaust pipe 5 under the action of the lime kiln main body dust removal fan 4. In this process, a part of the purified flue gas is first cooled by the heat exchanger 2, and then enters the lime kiln through the cooling blower 3 to cool the calcined lime. At the same time, the hot water after heat exchange can also provide heat for the heating system. Such a cycle not only reduces the total amount of lime kiln exhaust gas, but also increases the carbon dioxide concentration of the lime kiln exhaust gas, and can also reuse the lost heat to achieve secondary utilization of energy.

[0036] Example 2: Please refer to Figure 1 - Figure 12 The outer part 6 includes a bottom frame 601, and four supporting legs distributed in an array are provided at the bottom of the bottom frame 601. The interior of the bottom frame 601 is a cavity structure. An air inlet cylinder 602 is fixedly connected to the outer wall of the bottom frame 601, and the air inlet cylinder 602 is connected to the cavity part of the bottom frame 601. An air outlet cylinder 603 is fixedly connected to the outer wall of the bottom frame 601, and the air outlet cylinder 603 is connected to the cavity part of the bottom frame 601.

[0037] The top of the bottom mounting frame 601 is fixedly connected to the top of the top mounting frame 604. The interior of the top mounting frame 604 is a cavity structure. The top mounting frame 604 is connected to the cavity part of the bottom mounting frame 601. A rectangular through hole is opened on the outer wall of the top mounting frame 604. The top of the top mounting frame 604 is fixedly connected to the top protective frame 605. The interior of the top mounting frame 604 and the bottom mounting frame 601 are respectively fixedly connected to the inner frame 606.

[0038] The interior part 7 includes two interior plates 701, which are distributed up and down. The two interior plates 701 are respectively fixed to the corresponding interior frames 606. The two interior plates 701 are respectively provided with four circumferentially distributed docking screw holes 702. The interiors of the eight docking screw holes 702 are all threadedly connected to connecting tubes 703. The outer walls of the eight connecting tubes 703 are all provided with hexagonal protrusions for auxiliary adjustment. The control motor 704 is fixed to the bottom center position of the upper interior plate 701, and the motor shaft of the control motor 704 is connected to the driving gear 705.

[0039] The four torsion cylinders 801 are rotatably connected to the corresponding four upper connecting cylinders 703 . The four torsion cylinders 801 are coaxial with the corresponding connecting cylinders 703 . The four synchronization sleeves 802 are coaxial with the corresponding connecting cylinders 703 .

[0040] Synchronous gears 805 are fixed to the outer walls of the four torsion cylinders 801, and the four synchronous gears 805 are connected to the driving gear 705 through latching teeth. A dust extraction cylinder 806 is fixed to the interior of the top mounting frame 604, and the interior of the dust extraction cylinder 806 is set as a cavity structure. Four axial holes are provided on the top of the dust extraction cylinder 806, and the axial holes of the dust extraction cylinder 806 are all coaxial with the corresponding docking screw holes 702.

[0041] Four docking tubes 807 are fixedly connected to the bottom of the dust extraction tube 806. The four docking tubes 807 are coaxial with the corresponding axial holes on the dust extraction tube 806. The four docking tubes 807 are coaxial with the corresponding connecting tubes 703. The four docking tubes 807 are rotationally connected with the corresponding torsion tubes 801. An external connecting tube 808 is fixedly connected to the outer wall of the dust extraction tube 806. The external connecting tube 808 is fixedly inserted into the rectangular through hole of the top mounting frame 604.

[0042] In this embodiment, when the resistance of the bag reaches a preset value, the cleaning part 8 is started, the motor 704 is controlled to be turned on, and the motor shaft drives the driving gear 705 to rotate, and the four synchronous gears 805 meshing with the driving gear 705 rotate synchronously, thereby causing the four torsion cylinders 801 to rotate. Since the synchronous sleeve 802 at the bottom of the torsion cylinder 801 is fixedly plugged with a dust scraper 804, the dust scraper 804 is driven by the synchronous sleeve 802 to scrape the inner wall of the dust bag 901 360°, scraping off the attached dust, and the scraped dust is It settles to the bottom under the action of gravity. At the same time, the dust extraction cylinder 806 is connected to the external negative pressure source through the external tube 808, and negative pressure is generated in the channel formed by the dust extraction cylinder 806, the docking tube 807 and the torsion tube 801, so that the scraped dust is sucked into the dust extraction cylinder 806 and discharged to the designated dust collection device through the external tube 808, so as to prevent the dust from flying again in the equipment and the bag from being blocked due to dust accumulation. The continuous and stable cleaning operation can make the dust collection bag 901 always maintain good air permeability, ensuring that the dust removal efficiency is maintained at a high level for a long time.

[0043] Example 3: Please refer to Figure 1 - Figure 12 The four dust bags 901 are all fixedly connected to the corresponding lower connecting tubes 703, and the four docking end plates 902 are all coaxial with the corresponding connecting tubes 703. Four adjusting cylinders 905 are fixedly connected to the top of the top mounting frame 604. The telescopic shafts of the four adjusting cylinders 905 are all movably inserted into the corresponding shaft holes of the dust extraction tube 806, and the telescopic shafts of the four adjusting cylinders 905 are all fixedly connected to the corresponding movable ball heads 904.

[0044] In this embodiment, the adjusting cylinder 905 is started, and the telescopic shaft of the adjusting cylinder 905 is connected to the ball slot 903 of the docking end plate 902 at the top of the dust bag 901 through the movable ball head 904. The telescopic shaft of the adjusting cylinder 905 is extended and retracted, driving the dust bag 901 to adjust the state of the dust bag 901, thereby realizing the conversion between the dust removal state and the cleaning state of the lime kiln main body flue gas dust collector 1, which is convenient for its use.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0046] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for increasing the carbon dioxide concentration of lime kiln tail gas, comprising a lime kiln main body flue gas dust collector (1), characterized in that: The lime kiln main body flue gas dust collector (1) comprises an outer part (6), an inner part (7) is provided inside the outer part (6), a cleaning part (8) is provided inside the outer part (6), the cleaning part (8) comprises four torsion cylinders (801), the bottoms of the four torsion cylinders (801) are fixed with synchronous sleeves (802), the interiors of the four synchronous sleeves (802) are provided with inner slots (803), and the interiors of the four synchronous sleeves (802) are provided with Two scraping plates (804) are fixedly connected to the corresponding inner slots (803), a dust removal part (9) is provided inside the outer part (6), and the dust removal part (9) includes four dust removal bags (901), and the four dust removal bags (901) are fixedly connected with docking end plates (902), and the center positions of the four docking end plates (902) are each provided with a card slot (903), and the four card slots (903) are each movably connected with a movable ball head (904).

2. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 1, characterized in that: The tail of the lime kiln main body flue gas dust collector (1) is fixedly connected to a heat exchanger (2), the heat exchanger (2) is connected to a cooling blower (3), the lime kiln main body flue gas dust collector (1) is connected to a lime kiln main body dust removal fan (4), and the lime kiln main body dust removal fan (4) is connected to an exhaust pipe (5).

3. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 1, characterized in that: The outer part (6) comprises a bottom mounting frame (601), the bottom of the bottom mounting frame (601) is provided with four supporting legs distributed in an array, the interior of the bottom mounting frame (601) is a cavity structure, an air inlet cylinder (602) is fixedly connected to the outer wall of the bottom mounting frame (601), the air inlet cylinder (602) is kept connected to the cavity part of the bottom mounting frame (601), and an air outlet cylinder (603) is fixedly connected to the outer wall of the bottom mounting frame (601), the air outlet cylinder (603) is kept connected to the cavity part of the bottom mounting frame (601).

4. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 3, characterized in that: The top of the bottom mounting frame (601) is fixedly connected to a top mounting frame (604), the interior of the top mounting frame (604) is a cavity structure, the top mounting frame (604) is kept connected to the cavity portion of the bottom mounting frame (601), a rectangular through hole is opened on the outer wall of the top mounting frame (604), the top of the top mounting frame (604) is fixedly connected to a top protective frame (605), and the interiors of the top mounting frame (604) and the bottom mounting frame (601) are respectively fixedly connected to internal frames (606).

5. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 4, characterized in that: The interior part (7) includes two interior plates (701), which are distributed in an upper and lower manner. The two interior plates (701) are respectively fixed to the corresponding interior frames (606). The two interior plates (701) are respectively provided with four circumferentially distributed docking screw holes (702). The interiors of the eight docking screw holes (702) are all threadedly connected to connecting tubes (703). The outer walls of the eight connecting tubes (703) are all provided with hexagonal prism-shaped protrusions for auxiliary adjustment. A control motor (704) is fixed to the bottom center position of the upper interior plate (701), and the motor shaft of the control motor (704) is connected to a driving gear (705).

6. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 5, characterized in that: The four torsion cylinders (801) are rotatably connected to the corresponding four upper connecting cylinders (703); the four torsion cylinders (801) are kept coaxial with the corresponding connecting cylinders (703); and the four synchronization sleeves (802) are kept coaxial with the corresponding connecting cylinders (703).

7. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 6, characterized in that: The outer walls of the four torsion cylinders (801) are all fixedly connected with synchronous gears (805), and the four synchronous gears (805) are all connected to the driving gear (705) through latching teeth. The interior of the top mounting frame (604) is fixedly connected with a dust extraction cylinder (806), and the interior of the dust extraction cylinder (806) is set as a cavity structure. The top of the dust extraction cylinder (806) is provided with four axial holes, and the axial holes of the dust extraction cylinder (806) are all kept coaxial with the corresponding docking screw holes (702).

8. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 7, characterized in that: Four docking tubes (807) are fixedly connected to the bottom of the dust extraction tube (806), and the four docking tubes (807) are all coaxial with the corresponding axial holes on the dust extraction tube (806). The four docking tubes (807) are all coaxial with the corresponding connecting tubes (703). The four docking tubes (807) are all rotationally connected with the corresponding torsion tubes (801). An external connecting tube (808) is fixedly connected to the outer wall of the dust extraction tube (806), and the external connecting tube (808) is fixedly inserted into the rectangular through hole of the top mounting frame (604).

9. The device for increasing the carbon dioxide concentration in lime kiln tail gas according to claim 7, characterized in that: The four dust removal bags (901) are all fixedly connected in the corresponding lower connecting tubes (703), and the four docking end plates (902) are all kept coaxial with the corresponding connecting tubes (703). Four adjusting cylinders (905) are fixedly connected to the top of the top mounting frame (604), and the telescopic shafts of the four adjusting cylinders (905) are all movably inserted into the corresponding axial holes of the dust extraction tube (806), and the telescopic shafts of the four adjusting cylinders (905) are all kept fixedly connected with the corresponding movable ball heads (904).

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