Coal-fired flue gas treatment device with descaling structure

Abstract

The present invention discloses a coal-fired flue gas treatment device with a descaling structure, which belongs to the technical field of flue gas treatment equipment. The device comprises a coal-fired flue gas treatment through-bin body, a receiving through-hole is provided on one side of the coal-fired flue gas treatment through-bin body, and a closed mounting bin is installed on the side of the coal-fired flue gas treatment through-bin body close to the receiving through-hole, and a metal heat exchange pipe body is uniformly penetrated on one side of the coal-fired flue gas treatment through-bin body. The present invention provides an operating mechanism for driving the movable installation heat insulation plate to move on the closed mounting bin, and a scraping guide is provided on the cylindrical scraping brush member, so that when the outer wall of the metal heat exchange pipe body needs to be cleaned, the staff can drive the movable installation heat insulation plate and the cylindrical scraping brush member thereon to move along the corresponding metal heat exchange pipe body by rotating the forward and reverse screws, thereby scraping and cleaning the metal heat exchange pipe body and the wave-shaped guide groove thereon, which is more convenient and quick.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas treatment equipment, and in particular relates to a coal-fired flue gas treatment device with a descaling structure. Background Art

[0002] Coal is one of the main fossil energy raw materials in modern society and is widely used in various fields. For example, thermal power plants rely on coal as one of the main raw materials. In the actual use of coal, a large amount of flue gas will be generated. At the same time, these flue gases are at a high temperature and contain a large amount of harmful substances. Direct discharge will have a serious impact on the environment. Therefore, they need to be fully treated before discharge. Cooling is one of the more typical processes. The flue gas is generally cooled first and then subjected to subsequent treatment to avoid damage to subsequent treatment equipment caused by excessively high flue gas temperature.

[0003] When the existing coal-fired flue gas treatment device is in use, when it cools the flue gas, it often does so by passing the heat exchange medium through a pipe, and then extending the pipe to the flue gas circulation channel for heat exchange. Since the flue gas contains a large amount of particulate matter, in actual application, these particulate matter are easily attached and accumulated on the pipe used for heat exchange, thereby forming relatively stubborn dirt, which greatly reduces the heat exchange effect of the pipe. Therefore, it is necessary to frequently disassemble the equipment and clean the dirt on the outside of the heat exchange pipe, which makes the entire use process more cumbersome and greatly increases the actual workload of the staff. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a coal-fired flue gas treatment device with a descaling structure, which solves the problem that the heat exchange pipe part of the existing coal-fired flue gas treatment device is not convenient for quick and convenient cleaning of dirt.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a coal-fired flue gas treatment device with a descaling structure, comprising a coal-fired flue gas treatment passage bin body, a receiving through-hole being formed on one side of the coal-fired flue gas treatment passage bin body, and a closed installation bin being installed on a side of the coal-fired flue gas treatment passage bin body adjacent to the receiving through-hole, a metal heat exchange pipe body being uniformly passed through one side of the coal-fired flue gas treatment passage bin body, the metal heat exchange pipe body passing through the closed installation bin, and a wave-shaped guide groove being formed on the bottom of the outer wall of the metal heat exchange pipe body;

[0006] The outer side of the metal heat exchange pipe body is provided with a movable installation heat insulation plate, and a special-shaped installation groove is provided on the side of the movable installation heat insulation plate away from the closed installation chamber. A cylindrical scraper is provided inside the special-shaped installation groove, and the cylindrical scraper is located on the outer side of the metal heat exchange pipe body. A scraper guide is installed on the inner side wall of the cylindrical scraper, and the scraper guide extends to the inside of the wave-shaped guide groove;

[0007] Both ends of the special-shaped installation groove away from the closed installation chamber are installed with partition blocks, and both ends of the cylindrical scraper close to the partition block are installed with hemispherical extrusion blocks. The interior of the special-shaped installation groove is provided with an elastic mechanism for blowing air into the metal heat exchange pipe body;

[0008] An operating mechanism for driving the movable installation heat insulation board to move is provided inside the closed installation chamber.

[0009] As a further solution of the present invention: the scraping brush guide and the cylindrical scraping brush are manufactured in one piece, and the scraping brush guide and the wave-shaped guide groove form a relative sliding structure.

[0010] As a further solution of the present invention: the cylindrical scraping brush member and the special-shaped installation groove form a relatively rotating structure, and cutting heads are evenly installed on the side of the cylindrical scraping brush member away from the closed installation chamber.

[0011] As a further solution of the present invention: the elastic mechanism includes two groups of airbags, and the two groups of airbags are respectively installed at the top and bottom of the side of the special-shaped mounting groove away from the closed mounting compartment. The side of the airbag away from the closed mounting compartment is connected to an exhaust pipe, and the exhaust pipe passes through the movable mounting insulation plate. The side of the airbag close to the closed mounting compartment is connected to an air intake pipe, and the air intake pipe passes through the movable mounting insulation plate.

[0012] As a further solution of the present invention: the cross-section of the airbag is arc-shaped, and the overall thickness of the airbag is greater than the thickness of the partition block.

[0013] As a further solution of the present invention: an exhaust one-way valve is installed inside the exhaust pipe, and a dustproof net is installed at one end of the exhaust pipe away from the airbag.

[0014] As a further solution of the present invention: an air intake check valve is installed inside the air intake pipe, and a filter is installed at one end of the air intake pipe away from the airbag.

[0015] As a further solution of the present invention: the operating mechanism includes forward and reverse screw rods, which pass through one end of the closed mounting chamber, and movable mounting blocks are sleeved on the outer sides of the forward and reverse screw rods near both ends. The movable mounting block is hingedly connected to a transmission connecting rod on the side away from the closed mounting chamber, and the end of the transmission connecting rod away from the movable mounting block is hinged to the movable mounting heat insulation plate.

[0016] As a further solution of the present invention: the movable installation block is slidably connected to the closed installation chamber, and the movable installation block is threadedly connected to the forward and reverse screw rods.

[0017] As a further solution of the present invention: the length of the transmission connecting rod is smaller than the width of the interior of the closed installation compartment, and the two groups of transmission connecting rods are staggered in an upper and lower manner.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. An operating mechanism for driving the movable installation heat insulation plate to move is provided on the closed installation chamber, and a scraping brush guide is provided on the cylindrical scraping brush member. When it is necessary to clean the outer wall of the metal heat exchange pipe body, the staff can drive the movable installation heat insulation plate and the cylindrical scraping brush member on it to move along the corresponding metal heat exchange pipe body by rotating the forward and reverse screw rods, thereby scraping and cleaning the metal heat exchange pipe body and the wave-shaped guide groove on it, which is more convenient and quick.

[0020] 2. The cylindrical scraper and the special-shaped mounting groove form a relatively rotating structure, and the scraper guide and the wavy guide groove cooperate with each other. At the same time, a cutting head is provided on the cylindrical scraper, so that when the movable insulation plate drives the cylindrical scraper to move, the cylindrical scraper can rotate back and forth, so that the cutting head can cut the dirt on the metal heat exchange pipe body and scrape a part of it longitudinally, and then the scraping and cleaning of the dirt can be decomposed into two processes. First, the integrity of the dirt is destroyed, avoiding the situation where the cylindrical scraper relies entirely on horizontal scraping, which may cause too much effort or the dirt is too stubborn to be cleaned, or even cause damage to the metal heat exchange pipe body, making the whole cleaning process smoother.

[0021] 3. A hemispherical extrusion block is provided on the cylindrical scraper, and an elastic mechanism for blowing air toward the metal heat exchange pipe body is provided in the special-shaped installation groove. When the metal heat exchange pipe body is cleaned, the elastic mechanism can intermittently blow air near the part of the metal heat exchange pipe body being cleaned, thereby ensuring that the cleaned dirt falls off and the cleaning effect is guaranteed.

[0022] 4. The metal heat exchange pipe body is provided with a wave-shaped guide groove for cooperating with the scraper guide, so that the wave-shaped guide groove can not only be used to guide the scraper guide, but also increase the contact area of ​​the outer wall of the metal heat exchange pipe body, thereby making the flue gas more efficient when passing through the metal heat exchange pipe body from bottom to top and performing heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 It is a bottom view structural diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0026] Figure 4 This Figure 3 A schematic diagram of the enlarged structure at point A;

[0027] Figure 5 It is a schematic diagram of a top cross-sectional structure of the present invention;

[0028] Figure 6 It is a side cross-sectional structural schematic diagram of the present invention;

[0029] Figure 7 This invention Figure 6 A schematic diagram of the enlarged structure at point B;

[0030] Figure 8 It is a schematic diagram of a top view and cross-section of the movable installation heat insulation board of the present invention;

[0031] Figure 9 This invention Figure 8 Schematic diagram of the enlarged structure at C;

[0032] Figure 10 It is a schematic diagram of the main structure of the cylindrical scraping brush member of the present invention.

[0033] In the figure: 1. Coal-fired flue gas treatment through-bin body; 2. Accommodating through-hole; 3. Closed mounting bin; 4. Metal heat exchange pipe body; 5. Wave-shaped guide groove; 6. Movable mounting heat insulation board; 7. Special-shaped mounting groove; 8. Cylindrical scraper; 9. Scraper guide; 10. Cutting head; 11. Separator; 12. Hemispherical extrusion block; 13. Airbag; 14. Exhaust pipe; 15. Inlet pipe; 16. Forward and reverse screw rods; 17. Movable mounting block; 18. Transmission connecting rod. DETAILED DESCRIPTION

[0034] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0035] like Figures 1-10 As shown, the present invention provides a technical solution:

[0036] Example 1

[0037] A coal-fired flue gas treatment device with a descaling structure includes a coal-fired flue gas treatment through-bin main body 1, a receiving through-hole 2 is opened on one side of the coal-fired flue gas treatment through-bin main body 1, and a closed installation bin 3 is installed on the side of the coal-fired flue gas treatment through-bin main body 1 close to the receiving through-hole 2, a metal heat exchange pipe main body 4 is uniformly penetrated on one side of the coal-fired flue gas treatment through-bin main body 1, and the metal heat exchange pipe main body 4 penetrates the closed installation bin 3, and a wave-shaped guide groove 5 is opened at the bottom of the outer wall of the metal heat exchange pipe main body 4, and the two ends of the metal heat exchange pipe main body 4 are respectively connected to the circulating cooling medium supply and recovery equipment, and the circulating cooling medium supply and recovery equipment can be connected in the same way as the existing similar equipment, which will not be repeated here. During application, the wave-shaped guide groove 5 can increase the contact area between the metal heat exchange pipe main body 4 and the outside world, thereby allowing the flue gas to exchange heat with higher efficiency when passing through the metal heat exchange pipe main body 4. At the same time, during application, the wave-shaped guide groove 5 can be set in multiple groups according to actual needs to meet the effect of improving the heat exchange efficiency;

[0038] The outer side of the metal heat exchange pipe body 4 is provided with a movable installation heat insulation plate 6, and the movable installation heat insulation plate 6 is provided with a special-shaped installation groove 7 on the side away from the closed installation chamber 3. A cylindrical scraper 8 is provided inside the special-shaped installation groove 7, and the cylindrical scraper 8 is located on the outer side of the metal heat exchange pipe body 4. The movable installation heat insulation plate 6 and the metal heat exchange pipe body 4 form a relative sliding structure, so that during use, the movable installation heat insulation plate 6 can drive the cylindrical scraper 8 to slide horizontally on the metal heat exchange pipe body 4. The cylindrical scraper 8 can scrape and remove dirt on the outer wall of each group of metal heat exchange pipe bodies 4 in this process. At the same time, the thickness of the movable installation heat insulation plate 6 is less than or equal to the thickness of the internal space of the accommodating through hole 2, so that when not in use, the movable installation heat insulation plate 6 can be completely accommodated in the inside of the accommodating through hole 2, thereby not affecting the normal passage of flue gas in the coal-fired flue gas treatment through-bin body 1;

[0039] An operating mechanism for driving the movable installation heat insulation plate 6 to move is provided inside the closed installation chamber 3, and the operating mechanism includes forward and reverse screw rods 16, which pass through one end of the closed installation chamber 3, and movable installation blocks 17 are sleeved on the outer sides of the forward and reverse screw rods 16 near both ends. The movable installation block 17 is hinged to a transmission connecting rod 18 on the side away from the closed installation chamber 3, and the end of the transmission connecting rod 18 away from the movable installation block 17 is hinged to the movable installation heat insulation plate 6. The movable installation block 17 is slidably connected to the closed installation chamber 3, and the movable installation block 17 is threadedly connected to the forward and reverse screw rods 16, so that the staff can drive the two sets of transmission connecting rods 18 to move accordingly by rotating the forward and reverse screw rods 16, thereby driving the movable installation heat insulation plate 6 to complete the lateral movement, thereby completing the preliminary dirt cleaning work of the metal heat exchange pipe body 4;

[0040] The length of the transmission connecting rod 18 is smaller than the width inside the closed installation chamber 3, and the two sets of transmission connecting rods 18 are staggered up and down, so that when not in use, the transmission connecting rod 18 can be completely retracted into the interior of the closed installation chamber 3, thereby allowing the movable installation insulation board 6 to complete the fitting with the closed installation chamber 3, so that the channel formed by the coal flue gas treatment through the chamber main body 1 is in a completely sealed state. During the application process, rubber pads can be further added at the above-mentioned fitting part to ensure sealing.

[0041] Example 2

[0042] A scraping brush guide 9 is installed on the inner side wall of the cylindrical scraping brush 8, and the scraping brush guide 9 extends to the inside of the wavy guide groove 5. The scraping brush guide 9 and the cylindrical scraping brush 8 are made as an integral whole, and the scraping brush guide 9 and the wavy guide groove 5 form a relative sliding structure, and the cylindrical scraping brush 8 and the special-shaped mounting groove 7 form a relative rotation structure, and the cylindrical scraping brush 8 is evenly installed with a cutting head 10 on the side away from the closed mounting bin 3, so that when the cylindrical scraping brush 8 moves laterally to clean the outer wall of the metal heat exchange pipe body 4, the scraping brush guide 9 can also scrape and clean the inside of the wavy guide groove 5, and at the same time At the same time, the wavy guide groove 5 will cooperate with the scraper guide 9 to drive the cylindrical scraper 8 to rotate back and forth, so that the cutting head 10 on the cylindrical scraper 8 always cuts the dirt and scrapes and cleans a part of it longitudinally before the cylindrical scraper 8, so that the integrity of the dirt is destroyed, making it easier and faster for the subsequent cylindrical scraper 8 to clean a large area. At the same time, during the application process, the end of the wavy guide groove 5 away from the closed installation chamber 3 can be set to be expanded, so that the scraper guide 9 can completely push the dirt out of the wavy guide groove 5 when it is pushed to the end inside the wavy guide groove 5.

[0043] Example 3

[0044] Both ends of the special-shaped mounting groove 7 away from the closed mounting chamber 3 are installed with partition blocks 11, and both ends of the cylindrical scraping member 8 close to the partition block 11 are installed with hemispherical extrusion blocks 12. An elastic mechanism for blowing air into the metal heat exchange pipe body 4 is provided inside the special-shaped mounting groove 7. The elastic mechanism includes two groups of air bags 13, and the two groups of air bags 13 are respectively installed at the top and bottom of the special-shaped mounting groove 7 away from the closed mounting chamber 3. The side of the air bag 13 away from the closed mounting chamber 3 is connected to the exhaust pipe 14, and the exhaust pipe 14 passes through the movable installation heat insulation plate 6. The side of the air bag 13 close to the closed mounting chamber 3 is connected to the air intake pipe 15, and the air intake pipe 15 passes through the movable installation heat insulation plate 6.

[0045] The cross-section of the airbag 13 is arc-shaped, and the overall thickness of the airbag 13 is greater than the thickness of the partition block 11, so that during the reciprocating rotation of the cylindrical scraping member 8, the hemispherical extrusion block 12 can be intermittently aligned with the partition block 11 or the corresponding airbag 13. When the hemispherical extrusion block 12 is aligned with the partition block 11, the hemispherical extrusion block 12 does not interfere with the partition block 11. When the hemispherical extrusion block 12 is aligned with the airbag 13, due to the thickness and elasticity of the airbag 13, the hemispherical extrusion block 12 will squeeze the airbag 13.

[0046] An exhaust one-way valve is installed inside the exhaust pipe 14, and a dustproof net is installed at the end of the exhaust pipe 14 away from the air bag 13. An air intake one-way valve is installed inside the air intake pipe 15, and a filter is installed at the end of the air intake pipe 15 away from the air bag 13, so that when the hemispherical extrusion block 12 squeezes the air bag 13 as mentioned above, the air in the air bag 13 can be ejected through the exhaust pipe 14, thereby blowing air to the position of the metal heat exchange pipe body 4 being cleaned, thereby further ensuring that the cleaned dirt falls off and ensuring the cleaning effect. When the cylindrical scraper 8 drives the hemispherical extrusion block 12 to rotate to align with the partition block 11, the squeezing of the air bag 13 is released at this time, and the external air re-enters it after being filtered under the elastic recovery effect of the air bag 13. The above process is continuously and fully carried out during the entire use process;

[0047] It should be noted that the exhaust pipe 14 is arranged at an angle so that the nozzle of the exhaust pipe 14 can be aligned with the part of the metal heat exchange pipe body 4 that is being scraped and cleaned.

[0048] The working principle of the present invention is as follows: the coal-fired flue gas treatment passage body 1 is connected to the coal-fired flue gas treatment channel system, the flue gas can pass through the coal-fired flue gas treatment passage body 1 from bottom to top, and the metal heat exchange pipe body 4 is connected to the circulating water cooling equipment system for use. In the initial state, the movable installation heat insulation plate 6 is located inside the accommodating through hole 2, which does not affect the normal passage and heat exchange of the flue gas;

[0049] When it is necessary to clean the dirt on the outer wall of the metal heat exchange pipe body 4, the staff can manually or use a tool to rotate the forward and reverse screw rods 16 forward. As mentioned above, the two sets of movable mounting blocks 17 can move in opposite directions, and the movable mounting heat insulation plate 6 is driven by the transmission connecting rod 18 to move in the direction away from the closed mounting chamber 3, so that the cylindrical scraper 8 can scrape and clean the corresponding metal heat exchange pipe body 4 outer wall, and the scraper guide 9 can scrape and clean the corresponding wave-shaped guide groove 5. Further, when the scraper guide 9 slides in the corresponding wave-shaped guide groove 5, the cylindrical scraper 8 can be continuously moved forward. The reciprocating rotation makes the cutting head 10 always cut the dirt on the metal heat exchange pipe body 4 before the cylindrical scraping brush 8 and scrape it longitudinally to a certain extent, so that the integrity of the dirt is destroyed before the cylindrical scraping brush 8 scrapes it, and then the subsequent cylindrical scraping brush 8 is more labor-saving and convenient when scraping and cleaning a large area. At the same time, as mentioned above, during the reciprocating rotation of the cylindrical scraping brush 8, the air bag 13 is intermittently squeezed through the hemispherical squeezing block 12, so that the air bag 13 intermittently sprays air to the metal heat exchange pipe body 4 being scraped and cleaned through the exhaust pipe 14, so that the dirt scraped off can complete the task of finally falling off;

[0050] When the movable heat insulation plate 6 moves to the extreme position away from the closed installation chamber 3, the forward and reverse screw rods 16 cannot continue to be rotated forward. At this time, the forward and reverse screw rods 16 are rotated in the reverse direction until the movable heat insulation plate 6 moves back into the accommodating through hole 2. If necessary, the above process can be repeated multiple times to ensure that the metal heat exchange pipe body 4 is fully cleaned.

[0051] The above describes in detail the preferred embodiments of this patent, but this patent is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A coal-fired flue gas treatment device with a descaling structure, comprising a coal-fired flue gas treatment chamber body (1), characterized in that: A receiving through hole (2) is provided on one side of the coal-fired flue gas treatment through-bin body (1), and a closed installation bin (3) is installed on the side of the coal-fired flue gas treatment through-bin body (1) close to the receiving through hole (2). A metal heat exchange pipe body (4) is uniformly passed through one side of the coal-fired flue gas treatment through-bin body (1), and the metal heat exchange pipe body (4) passes through the closed installation bin (3). A wave-shaped guide groove (5) is provided at the bottom of the outer wall of the metal heat exchange pipe body (4); The outer side of the metal heat exchange pipe body (4) is provided with a movable installation heat insulation plate (6), and a special-shaped installation groove (7) is provided on the side of the movable installation heat insulation plate (6) away from the closed installation chamber (3), and a cylindrical scraping brush (8) is provided inside the special-shaped installation groove (7), and the cylindrical scraping brush (8) is located outside the metal heat exchange pipe body (4), and a scraping brush guide (9) is installed on the inner side wall of the cylindrical scraping brush (8), and the scraping brush guide (9) extends to the inside of the wave-shaped guide groove (5); Both ends of the side of the special-shaped installation groove (7) away from the closed installation chamber (3) are installed with separation blocks (11), and both ends of the side of the cylindrical scraping brush (8) close to the separation block (11) are installed with hemispherical extrusion blocks (12). The interior of the special-shaped installation groove (7) is provided with an elastic mechanism for blowing air to the metal heat exchange pipe body (4); An operating mechanism for driving the movable installation heat insulation board (6) to move is provided inside the closed installation chamber (3).

2. The coal-fired flue gas treatment device with a descaling structure according to claim 1, characterized in that: The scraping brush guide (9) and the cylindrical scraping brush member (8) are made in one piece, and the scraping brush guide (9) and the wave-shaped guide groove (5) form a relative sliding structure.

3. The coal-fired flue gas treatment device with a descaling structure according to claim 1, characterized in that: The cylindrical scraping brush member (8) and the special-shaped installation groove (7) form a relatively rotating structure, and a cutting head (10) is evenly installed on the side of the cylindrical scraping brush member (8) away from the closed installation chamber (3).

4. The coal-fired flue gas treatment device with a descaling structure according to claim 1, characterized in that: The elastic mechanism comprises two groups of airbags (13), and the two groups of airbags (13) are respectively installed at the top and bottom of the side of the special-shaped installation groove (7) away from the closed installation chamber (3); the side of the airbag (13) away from the closed installation chamber (3) is connected to an exhaust pipe (14), and the exhaust pipe (14) passes through the movable installation heat insulation plate (6); the side of the airbag (13) close to the closed installation chamber (3) is connected to an air intake pipe (15), and the air intake pipe (15) passes through the movable installation heat insulation plate (6).

5. The coal-fired flue gas treatment device with a descaling structure according to claim 4, characterized in that: The cross section of the airbag (13) is formed into an arc shape, and the overall thickness of the airbag (13) is greater than the thickness of the partition block (11).

6. The coal-fired flue gas treatment device with a descaling structure according to claim 4, characterized in that: An exhaust one-way valve is installed inside the exhaust pipe (14), and a dustproof net is installed at one end of the exhaust pipe (14) away from the air bag (13).

7. The coal-fired flue gas treatment device with a descaling structure according to claim 4, characterized in that: An air intake check valve is installed inside the air intake pipe (15), and a filter is installed at one end of the air intake pipe (15) away from the air bag (13).

8. The coal-fired flue gas treatment device with a descaling structure according to claim 1, characterized in that: The operating mechanism includes a forward and reverse screw rod (16), one end of the forward and reverse screw rod (16) passes through the inside of the closed installation chamber (3), and the outer sides of the forward and reverse screw rod (16) near both ends are sleeved with movable installation blocks (17), and the side of the movable installation block (17) away from the closed installation chamber (3) is hinged with a transmission connecting rod (18), and the end of the transmission connecting rod (18) away from the movable installation block (17) is hinged to the movable installation heat insulation board (6).

9. The coal-fired flue gas treatment device with a descaling structure according to claim 8, characterized in that: The movable installation block (17) is connected to the closed installation chamber (3) in a sliding manner, and the movable installation block (17) is connected to the forward and reverse screw rods (16) in a threaded manner.

10. The coal-fired flue gas treatment device with a descaling structure according to claim 8, characterized in that: The length of the transmission connecting rod (18) is smaller than the width of the interior of the closed installation chamber (3), and the two groups of transmission connecting rods (18) are arranged in an upper and lower staggered manner.

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