A high-efficiency air-cooled heat exchanger for radar systems

Abstract

This invention relates to the field of air-cooled heat exchanger technology, specifically a high-efficiency air-cooled heat exchanger for radar systems. It includes a refrigeration mechanism, multiple sets of medium heat exchange mechanisms installed within the refrigeration mechanism, and a tube cleaning mechanism installed on the medium heat exchange mechanisms. The refrigeration mechanism includes a cover plate, a fan fixedly installed within the cover plate, a first outer shell fixedly installed inside the cover plate, and a second outer shell fixedly installed on the other side of the first outer shell. By setting a return pipe, and installing a traction cable and multiple evenly distributed built-in shims inside the return pipe, as the heat medium enters the return pipe, adjacent built-in shims quantitatively store the heat medium. With the sequential rotation of the traction cable, the built-in shims push the measured heat medium along the inside of the return pipe. By implementing segmented air cooling and forced liquid cooling of the return pipe, the cooling efficiency of the medium inside the pipe is accelerated, while the return pipe itself is also forcibly cooled.

Description

Technical Field

[0001] This invention relates to the field of air-cooled heat exchanger technology, specifically to a high-efficiency air-cooled heat exchanger for radar systems. Background Technology

[0002] An air-cooled heat exchanger (also known as an air cooler) is a heat exchange device that uses air as a cooling medium to transfer heat from the process medium (such as liquid or gas) to the air through forced or natural convection, thereby achieving cooling. Its core principle is based on the synergistic effect of heat conduction and airflow, requiring no cooling water consumption, making it suitable for water-scarce areas or scenarios with high water conservation requirements.

[0003] However, air-cooled heat exchangers used in radar systems have certain drawbacks in actual use. Due to the limited volume of the location of the radar system, the limited volume will have a great impact on the working efficiency of the air-cooled heat exchanger. During radar operation, its surroundings will continuously release extremely high heat energy. The limited space will restrict the convective heat dissipation of the air-cooling system. At the same time, the cooling pipes are continuously radiated by the heated medium, and the pipes cannot be effectively cooled. Once the pipes are continuously heated, the cooling efficiency for the subsequent high-temperature medium will be further reduced, and in severe cases, it will cause the cooling system to fail.

[0004] In view of this, a high-efficiency air-cooled heat exchanger for radar systems was designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows:

[0007] A high-efficiency air-cooled heat exchanger for a radar system includes a refrigeration mechanism, multiple sets of medium heat exchange mechanisms installed within the refrigeration mechanism, and a pipe cleaning mechanism installed on the medium heat exchange mechanisms. The refrigeration mechanism includes a cover plate, a fan fixedly installed within the cover plate, a first outer shell fixedly installed on the inner side of the cover plate, and a second outer shell fixedly installed on the other side of the first outer shell. The slots on the inner sides of the first and second outer shells form a duct for the fan to directionally exhaust air. The medium heat exchange mechanism includes a return pipe located at the fan outlet, with a groove inside the return pipe, a linkage shaft movably installed inside the return pipe, an internal drive gear installed outside the linkage shaft and located inside the groove, a traction cable disposed in the inner cavity of the return pipe, and multiple internal paddles fixedly installed outside the traction cable, with the outer wall of the internal paddles adapted to fit against the inner wall of the return pipe. The pipe cleaning mechanism is used to continuously clean the top section of the return pipe.

[0008] In a preferred embodiment, the present invention can be further configured such that: a rectangular groove is provided at the bottom of both the first outer shell and the second outer shell, and a semiconductor cooling element and a metal pad fixedly installed on the top of the semiconductor cooling element are fixedly installed inside the rectangular groove;

[0009] The inner walls of both the first and second outer shells are provided with limiting slots for clamping the return pipe;

[0010] The sealed cavity formed by the first outer shell, the second outer shell, and the cover plate is filled with condensate, and the metal pad is immersed in the condensate.

[0011] In a preferred embodiment, the present invention may be further configured as follows: the pipe cleaning mechanism includes a load-bearing plate fixedly installed on the return pipe and placed horizontally, a deflection wheel movably installed on the outer end of the load-bearing plate, an auxiliary pulley fixedly installed on the deflection wheel, a pull rod movably installed on the deflection wheel, and a first clamp connected to the other end of the pull rod.

[0012] A symmetrically distributed main scraper and auxiliary scraper are movably installed on the pipe section at the top of the return pipe. A second clamp is movably installed on the main scraper, and a third clamp is movably installed on the auxiliary scraper. A second lever arm is movably installed in the middle of the second clamp, and a first lever arm is movably installed at the outer end of the third clamp. End plates are movably installed on the two adjacent ends of the second lever arm and the first lever arm.

[0013] In a preferred embodiment, the present invention can be further configured such that: both the main scraper and the auxiliary scraper are welded together from two annular washers and multiple support rods, and the end of the annular washer away from the support rod has a beveled structure.

[0014] In a preferred embodiment, the present invention may be further configured such that: a housing is fixedly installed on the inner side of the first housing, a motor is fixedly installed inside the housing, and a first transmission belt is driven to the motor.

[0015] In a preferred embodiment, the present invention may be further configured such that: the medium heat exchange mechanism further includes a linkage pulley fixedly installed at one end of the linkage shaft and an auxiliary gear installed on the linkage shaft and located outside the return pipe; an end shaft is installed inside the return pipe, a transmission gear is movably installed on the end shaft, and a transmission pulley is fixedly installed at the outer end of the transmission gear.

[0016] The auxiliary gear is adapted to mesh with the transmission gear.

[0017] In a preferred embodiment, the present invention may be further configured such that a second transmission belt is drivingly connected to the transmission pulley and the auxiliary pulley.

[0018] In a preferred embodiment, the present invention can be further configured such that: one end of the reflux pipe is fixedly installed with an outlet pipe, and the other end of the reflux pipe is fixedly installed with an inlet pipe.

[0019] In a preferred embodiment, the present invention can be further configured such that: a limiting frame is fixedly installed on the back of the return pipe, and the limiting frame is in the form of an L-shape, a vertical groove is provided inside the limiting frame, and an end plate is movably installed in the vertical groove.

[0020] In a preferred embodiment, the present invention may be further configured such that the tie rod is welded together from two column heads and an end rod, and the tie rod is used to provide a connecting carrier for two adjacent main scrapers.

[0021] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows:

[0022] 1. This invention features a return pipe with a traction cable and multiple evenly distributed built-in paddles inside. As the heat medium enters the return pipe, adjacent built-in paddles quantitatively store the heat medium. With the sequential rotation of the traction cable, the built-in paddles push the measured heat medium along the inside of the return pipe. By implementing segmented air cooling and forced liquid cooling of the return pipe, the cooling efficiency of the medium inside the pipe is accelerated, while the return pipe itself is also forcibly cooled.

[0023] 2. This invention installs a first outer shell and multiple evenly distributed second outer shells on the outside of the return pipe. The number of outer shells is set according to the built-in volume of the radar system. After sealing, the inner cavities of the multiple outer shells form a seepage-proof cavity. By injecting condensate into the sealed cavity, and simultaneously cooperating with semiconductor cooling components and metal pads to cool the condensate, the cooling efficiency of the medium within a constant capacity can be further improved through the low-temperature effect of the outer wall of the return pipe and multiple built-in fins.

[0024] 3. This invention involves symmetrically distributed main and auxiliary scrapers installed on the outside of the top section of the return pipe. As the linkage shaft drives the auxiliary gear, mechanical energy is converted into kinetic energy of the pipe cleaning mechanism. Ultimately, the main and auxiliary scrapers continuously clean the top section of the return pipe, thereby improving the cooling effect of the fan on the cleaned section of the top of the return pipe. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the use of the present invention;

[0026] Figure 2 This is a top view of the present invention;

[0027] Figure 3 This is an exploded view of the refrigeration mechanism of the present invention;

[0028] Figure 4 This is a partial schematic diagram of the present invention;

[0029] Figure 5This is an exploded schematic diagram of the medium heat exchange mechanism of the present invention;

[0030] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0031] Figure 7 This is an exploded view of the tube cleaning mechanism of the present invention.

[0032] Figure label:

[0033] 100. Refrigeration mechanism; 110. Cover plate; 120. Fan; 130. First outer casing; 140. Chassis; 1401. Motor; 1402. First transmission belt; 150. Second outer casing; 160. Rectangular groove; 170. Limiting groove; 180. Semiconductor refrigeration component; 1801. Metal pad;

[0034] 200. Medium heat exchange mechanism; 210. Return pipe; 2101. Liquid outlet pipe; 2102. Liquid inlet pipe; 2103. Groove; 220. Limiting frame; 230. Traction cable; 2301. Built-in paddle; 240. Linkage shaft; 2401. Linkage pulley; 2402. Auxiliary gear; 2403. Built-in drive gear; 250. End shaft; 2501. Transmission gear; 2502. Transmission pulley; 260. Second transmission belt;

[0035] 300. Pipe cleaning mechanism; 310. Load-bearing plate; 320. Deflection wheel; 3201. Assist pulley; 3202. Tie rod; 330. Main scraper; 3301. First chuck; 3302. Second chuck; 340. Secondary scraper; 3401. Third chuck; 350. End plate; 3501. First lever arm; 3502. Second lever arm. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0037] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0038] The following describes, with reference to the accompanying drawings, some embodiments of a high-efficiency air-cooled heat exchanger for a radar system. Example 1

[0039] Combination Figures 1 to 7As shown, the present invention provides a high-efficiency air-cooled heat exchanger for a radar system, comprising a refrigeration mechanism 100, multiple sets of medium heat exchange mechanisms 200 installed within the refrigeration mechanism 100, and a tube cleaning mechanism 300 installed on the medium heat exchange mechanism 200. The refrigeration mechanism 100 is used to perform forced and efficient cooling treatment on the heat medium. The medium heat exchange mechanism 200 is used to provide an independent cooling channel for the heat medium and accelerate the cooling efficiency of the heat medium. The tube cleaning mechanism 300 is used to improve the cooling speed of the top tube section of the medium heat exchange mechanism 200 and to perform preliminary cooling on the heat medium.

[0040] The refrigeration mechanism 100 includes a cover plate 110, a fan 120 fixedly installed inside the cover plate 110, a first outer shell 130 fixedly installed inside the cover plate 110, and a second outer shell 150 fixedly installed on the other side of the first outer shell 130. The slots inside the first outer shell 130 and the second outer shell 150 form an air duct for the fan 120 to directionally exhaust air.

[0041] The medium heat exchange mechanism 200 includes a return pipe 210 located at the air outlet of the fan 120, and a groove 2103 is provided inside the return pipe 210. A linkage shaft 240 is movably installed inside the return pipe 210. An internal drive gear 2403 is installed outside the linkage shaft 240 and located inside the groove 2103. A traction cable 230 is provided in the inner cavity of the return pipe 210 and multiple internal paddles 2301 are fixedly installed outside the traction cable 230. The outer wall of the internal paddles 2301 is adapted to fit against the inner wall of the return pipe 210. A linkage pulley 2401 is fixedly installed at one end of the linkage shaft 240 and an auxiliary gear 2402 is installed on the linkage shaft 240 and located outside the return pipe 210. An end shaft 250 is installed inside the return pipe 210. A transmission gear 2501 is movably installed on the end shaft 250 and a transmission pulley 2502 is fixedly installed at the outer end of the transmission gear 2501.

[0042] The auxiliary gear 2402 is adapted to mesh with the transmission gear 2501;

[0043] One end of the return pipe 210 is fixedly installed with an outlet pipe 2101, and the other end of the return pipe 210 is fixedly installed with an inlet pipe 2102. A limit frame 220 is fixedly installed on the back of the return pipe 210, and the limit frame 220 is in an L-shaped structure. A vertical groove is opened inside the limit frame 220, and the end plate 350 is movably installed in the vertical groove.

[0044] The pipe cleaning mechanism 300 is used to continuously clean the top section of the return pipe 210.

[0045] The heat medium is introduced into the inner cavity of the return pipe 210 through the inlet pipe 2102. As the built-in paddle 2301 and the traction cable 230 are driven to rotate at a constant speed along the inner cavity of the return pipe 210, the heat medium stored quantitatively by the two adjacent built-in paddles 2301 will be transferred to the top section of the return pipe 210. The top section of the return pipe 210 is cooled by the fan 120. Therefore, the quantitative heat medium can be initially cooled by passing through the air-cooled top section of the return pipe 210 until the medium continues to be transferred along the inner cavity of the return pipe 210 to its bottom section.

[0046] Since the bottom section of the return pipe 210 is immersed in the condensate, efficient cooling can be achieved through the condensate and the metered medium forcibly cooled by the built-in fins 2301. Example 2

[0047] Combination Figures 3 to 6 As shown, based on Embodiment 1, both the bottom of the first outer shell 130 and the second outer shell 150 are provided with rectangular grooves 160, and a semiconductor cooling component 180 and a metal pad 1801 fixedly installed on the top of the semiconductor cooling component 180 are fixedly installed inside the rectangular groove 160.

[0048] The inner walls of the first outer shell 130 and the second outer shell 150 are both provided with limiting slots 170 for clamping the return pipe 210.

[0049] The sealed cavity formed by the first outer shell 130, the second outer shell 150 and the cover plate 110 is filled with condensate, and the metal gasket 1801 is immersed in the condensate.

[0050] A housing 140 is fixedly installed inside the first housing 130, and a motor 1401 and a first transmission belt 1402 connected to the motor 1401 are fixedly installed inside the housing 140.

[0051] Preferably, a certain number of second housings 150 are selected according to the built-in volume of the radar system. Two cover plates 110 and two first housings 130 serve as sealing components for the multiple second housings 150. At this time, the cover plates 110, the first housings 130 and the internal cavities of the second housings 150 can form a sealed environment, and the condensate injected into the sealed environment can completely submerge the pipe section at the bottom of the return pipe 210.

[0052] Multiple semiconductor cooling components 180 are electrically connected. When the semiconductor cooling component 180 is powered on and is in cooling operation, the metal pad 1801 installed on the top of the semiconductor cooling component 180 will force the condensate in the sealed environment to be cooled. The condensate that is forced to be cooled acts on the built-in fin 2301 through the wall of the return pipe 210, thereby achieving rapid cooling of the heat medium in a limited space. Example 3

[0053] Combination Figures 5 to 7 As shown, in the above embodiment, the pipe cleaning mechanism 300 includes a load-bearing plate 310 fixedly installed on the return pipe 210 and horizontally placed, a deflection wheel 320 movably installed on the outer end of the load-bearing plate 310, an auxiliary pulley 3201 fixedly installed on the deflection wheel 320, a pull rod 3202 movably installed on the deflection wheel 320, and a first clamp 3301 connected to the other end of the pull rod 3202.

[0054] A symmetrically distributed main scraper 330 and auxiliary scraper 340 are movably installed on the pipe section at the top of the return pipe 210. A second clamp 3302 is movably installed on the main scraper 330, and a third clamp 3401 is movably installed on the auxiliary scraper 340. A second lever arm 3502 is movably installed in the middle of the second clamp 3302, and a first lever arm 3501 is movably installed at the outer end of the third clamp 3401. End plates 350 are movably installed on the two adjacent ends of the second lever arm 3502 and the first lever arm 3501.

[0055] A second transmission belt 260 is connected to the transmission pulley 2502 and the auxiliary pulley 3201.

[0056] Both the main scraper 330 and the auxiliary scraper 340 are welded together from two annular washers and multiple support rods, and the end of the annular washer away from the support rod has a beveled structure.

[0057] The tie rod 3202 is welded together from two column heads and an end rod, and the tie rod 3202 is used to provide a connecting carrier for two adjacent main scraper parts 330.

[0058] Preferably, the load-bearing plate 310 is fixed to the return pipe 210 by welding, and the middle rod of the deflection wheel 320 is installed in the load-bearing plate 310 through bearings;

[0059] When the second transmission belt 260 drives the auxiliary pulley 3201, the auxiliary pulley 3201 and the deflection wheel 320 will pull the pull rod 3202 to extend regularly. The other end of the pull rod 3202 will drive the first clamp 3301 and the main scraper 330 to continuously clean half of the top section of the return pipe 210. As the second clamp 3302 drives the second lever arm 3502 to extend back and forth, the end plate 350, which is limited and constrained by the limit frame 220, will drive the first lever arm 3501, the third clamp 3401 and the auxiliary scraper 340 to move at the same speed and in opposite directions. Finally, the auxiliary scraper 340 will continuously clean the other half of the top section of the return pipe 210, thereby improving the efficiency of the heat medium being cooled by air after passing through the top section of the return pipe 210.

[0060] The working principle and usage process of the present invention: When the heat medium enters the inner cavity of the return pipe 210 through the inlet pipe 2102, the motor 1401 in operation will drive the first transmission belt 1402 to rotate, and the other end of the first transmission belt 1402 will drive the linkage pulley 2401 and the linkage shaft 240.

[0061] As the linkage shaft 240 rotates at a uniform speed, the built-in drive gear 2403 fixedly installed on the linkage shaft 240 will assist the rotation of the combined traction cable 230 and the built-in paddle 2301. The hot medium entering the inner cavity of the return pipe 210 will be transferred sequentially by the evenly distributed built-in paddle 2301 until the transferred hot medium passes through the pipe section at the top of the return pipe 210. During the operation of the fan 120, the evenly distributed pipe section at the top of the return pipe 210 will be cooled by air. The medium after the initial cooling will continue to be pushed by the built-in paddle 2301 and transferred to the pipe section at the bottom of the return pipe 210.

[0062] To improve the cooling efficiency of the bottom section of the return pipe 210, condensate is injected into the inner cavities of the cover plate 110, the first outer shell 130, and the multiple second outer shells 150 that form a sealed structure. Multiple evenly distributed semiconductor cooling elements 180 are electrically connected. When the semiconductor cooling elements 180 are energized and begin cooling operation, the metal pad 1801 installed on the semiconductor cooling elements 180 can force-cool the condensate. The medium pushed into the bottom section of the return pipe 210 by the built-in tweezers 2301 can then undergo secondary cooling. Since the multiple built-in tweezers 2301 are adapted to fit the inner wall of the return pipe 210, the low temperature radiated along the pipe wall of the return pipe 210 to the built-in tweezers 2301 will efficiently cool the uniform medium. At this time, the device can achieve efficient air-cooled heat exchange for the radar system in a minimal volume.

[0063] Meanwhile, the linkage pulley 2401 installed on the linkage shaft 240 will drive the transmission gear 2501, the end shaft 250 and the transmission pulley 2502, and the transmission pulley 2502 will drive the second transmission belt 260. At this time, the other end of the second transmission belt 260 will drive the auxiliary pulley 3201 and the deflection wheel 320. Finally, the deflection wheel 320 will drive the pull rod 3202, the first chuck 3301 and the main scraper 330 to clean the pipe section at the top of the return pipe 210 in a regular manner. The end plate 350, which is limited and constrained by the limit frame 220, will drive the first lever arm 3501, the third chuck 3401 and the auxiliary scraper 340 to extend at the same speed. The auxiliary scraper 340 will clean the other half of the pipe section at the top of the return pipe 210, thereby ensuring that the pipe section at the top of the return pipe 210 remains clean and that the hot medium passing through its inner cavity is efficiently cooled.

[0064] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-efficiency air-cooled heat exchanger for a radar system, comprising a refrigeration mechanism (100), characterized in that, It also includes multiple sets of medium heat exchange mechanisms (200) installed in the refrigeration mechanism (100) and a tube cleaning mechanism (300) installed on the medium heat exchange mechanism (200); The refrigeration mechanism (100) includes a cover plate (110), a fan (120) fixedly installed inside the cover plate (110), a first outer shell (130) fixedly installed inside the cover plate (110), and a second outer shell (150) fixedly installed on the other side of the first outer shell (130). The slots inside the first outer shell (130) and the second outer shell (150) form an air duct for the fan (120) to directionally exhaust air. The medium heat exchange mechanism (200) includes a return pipe (210) located at the air outlet of the fan (120), and a groove (2103) is provided inside the return pipe (210), a linkage shaft (240) movably installed inside the return pipe (210), an internal drive gear (2403) installed outside the linkage shaft (240) and located inside the groove (2103), a traction cable (230) set in the inner cavity of the return pipe (210), and a plurality of internal paddles (2301) fixedly installed outside the traction cable (230), and the outer wall of the internal paddles (2301) is adapted to fit against the inner wall of the return pipe (210); The pipe cleaning mechanism (300) is used to continuously clean the top section of the return pipe (210).

2. The high-efficiency air-cooled heat exchanger for a radar system according to claim 1, characterized in that, The bottom of the first housing (130) and the second housing (150) are provided with rectangular grooves (160), and a semiconductor cooling component (180) and a metal pad (1801) fixedly installed on the top of the semiconductor cooling component (180) are fixedly installed inside the rectangular grooves (160). The inner walls of the first outer shell (130) and the second outer shell (150) are both provided with limiting slots (170) for clamping the return pipe (210). The sealed cavity formed by the first outer shell (130), the second outer shell (150) and the cover plate (110) is filled with condensate, and the metal pad (1801) is immersed in the condensate.

3. The high-efficiency air-cooled heat exchanger for a radar system according to claim 1, characterized in that, The pipe cleaning mechanism (300) includes a horizontally mounted load-bearing plate (310) fixedly installed on the return pipe (210), a deflection wheel (320) movably installed on the outer end of the load-bearing plate (310), an auxiliary pulley (3201) fixedly installed on the deflection wheel (320), a pull rod (3202) movably installed on the deflection wheel (320), and a first clamp (3301) connected to the other end of the pull rod (3202). A main scraper (330) and a secondary scraper (340) are movably installed on the pipe section at the top of the return pipe (210). A second clamp (3302) is movably installed on the main scraper (330), and a third clamp (3401) is movably installed on the secondary scraper (340). A second lever arm (3502) is movably installed in the middle of the second clamp (3302), and a first lever arm (3501) is movably installed at the outer end of the third clamp (3401). End plates (350) are movably installed on the two adjacent ends of the second lever arm (3502) and the first lever arm (3501).

4. A high-efficiency air-cooled heat exchanger for a radar system according to claim 3, characterized in that, The main scraper (330) and the auxiliary scraper (340) are both welded together from two annular washers and multiple support rods, and the end of the annular washer away from the support rod has a beveled structure.

5. A high-efficiency air-cooled heat exchanger for a radar system according to claim 1, characterized in that, A housing (140) is fixedly installed on the inner side of the first housing (130), a motor (1401) is fixedly installed inside the housing (140), and a first transmission belt (1402) is connected to the motor (1401).

6. A high-efficiency air-cooled heat exchanger for a radar system according to claim 3, characterized in that, The medium heat exchange mechanism (200) further includes a linkage pulley (2401) fixedly installed at one end of the linkage shaft (240) and an auxiliary gear (2402) installed on the linkage shaft (240) and located outside the return pipe (210). An end shaft (250) is installed inside the return pipe (210), a transmission gear (2501) is movably installed on the end shaft (250), and a transmission pulley (2502) is fixedly installed at the outer end of the transmission gear (2501). The auxiliary gear (2402) is adapted to mesh with the transmission gear (2501).

7. A high-efficiency air-cooled heat exchanger for a radar system according to claim 6, characterized in that, A second transmission belt (260) is connected to the transmission pulley (2502) and the auxiliary pulley (3201).

8. A high-efficiency air-cooled heat exchanger for a radar system according to claim 1, characterized in that, One end of the return pipe (210) is fixedly installed with an outlet pipe (2101), and the other end of the return pipe (210) is fixedly installed with an inlet pipe (2102).

9. A high-efficiency air-cooled heat exchanger for a radar system according to claim 1, characterized in that, The back of the return pipe (210) is fixedly installed with a limiting frame (220), and the limiting frame (220) is in an L-shaped structure. The limiting frame (220) has a vertical groove inside, and the end plate (350) is movably installed in the vertical groove.

10. A high-efficiency air-cooled heat exchanger for a radar system according to claim 3, characterized in that, The tie rod (3202) is welded together from two column heads and an end rod, and the tie rod (3202) is used to provide a connecting carrier for two adjacent main scrapers (330).

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