An adjustable trenching device for underground power pipeline construction on different surfaces

Abstract

The present invention provides an adjustable trenching device for underground power pipeline construction for different ground surfaces, belonging to the technical field of power pipeline construction. It solves technical problems such as the single function of existing cable trenchers and the inability to use the power of the cable trenchers to push back sand and soil. The adjustable trenching device for underground power pipeline construction for different ground surfaces includes a trenching machine body, a feeding mechanism provided at the front end of the trenching machine body, a filling mechanism provided at the rear end of the trenching machine body, crawler wheels connected to the bottom of the trenching machine body via a frame, and the filling mechanism includes a third motor fixed to the side of the trenching machine body, a second rotating shaft fixedly connected to the output end of the third motor, a connecting member fixedly connected to the second rotating shaft, a first electric telescopic rod fixed to the rear end of the connecting member, a hollow cylinder fixed to the movable end of the first electric telescopic rod, and a rotating rod rotatably connected to the inner wall of the hollow cylinder. The present invention has the advantages of performing filling work after pipeline burial and adjusting soil for different soils.

Description

Technical Field

[0001] The invention belongs to the technical field of power pipeline construction, and relates to a trenching machine, in particular to an adjustable trenching device for underground power pipeline construction on different ground surfaces. Background Art

[0002] The installation of cable pipelines must comply with relevant safety regulations and standards. Trenching is a common practice that meets safety requirements. It helps ensure the stability and safety of the cables and reduces potential safety hazards. By trenching and burying the cables underground, the cables are effectively protected from external factors such as vehicle damage, vandalism, and the natural environment. Furthermore, the cables in the trench are better secured and protected, reducing damage caused by vibration or movement. With the continuous advancement of urban and rural construction, the demand for efficient and precise trenching equipment is increasing. Compared to manual excavation, cable trenching machines can significantly improve construction efficiency and reduce labor costs.

[0003] A search revealed a Chinese patent document describing a double-row bulldozer for power construction [Application Number: 201910112181.X; Publication Number: CN109763528A]. This double-row bulldozer uses the horizontal telescopic movement of the bulldozer blade to prevent excavated sand and soil from falling back into the excavated trench, effectively ensuring the required trench depth for cable laying.

[0004] Although the double-row bulldozer cable trencher for power construction disclosed in this patent has the function of preventing the excavated sand and mud from falling back into the excavated trench, the sand and mud excavated during the cable trenching need to be pushed back after the pipeline is laid, and this needs to be pushed back manually. The cable trencher has a single function and cannot use the power of the cable trencher to push the sand and mud back. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose an adjustable trenching device for underground power pipeline construction for different ground surfaces. The technical problem to be solved by this invention is: how to achieve soil filling after the pipeline is buried and soil adjustment for different soils.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The jack-up mechanism is connected with the lifting mechanism on the jack-up plate of the lifting device, and the lifting mechanism is connected with the lifting mechanism on the lifting plate by the spring.

[0008] The working principle of the present invention is as follows: After the trenching machine body has completed trenching for underground power lines, the excavated soil is filled into the trench where the power lines were buried. Before filling the excavated soil into the trench where the power lines were buried, humic acid and bentonite are mixed into the soil through a feeding mechanism according to different soil conditions to adjust the acidity and alkalinity or improve the physical properties of the soil. First, the third motor is operated to drive the second rotating shaft to rotate. The second rotating shaft drives the first electric telescopic rod to rotate through a connecting plate. The fixed block and the leveling shovel rotate with the first electric telescopic rod to adjust the height so that the leveling shovel contacts the ground. The first electric telescopic rod and the second telescopic rod are operated. The angle between the leveling shovel and the ground is adjusted by the length difference between the first and second telescopic rods. The first slider slides on the first slider bar as the leveling shovel moves. The first and second rotating pairs rotate, and the rotation between the rotating rod and the hollow cylinder adapts to the changes in the height and angle of the leveling shovel. After the leveling shovel contacts the ground, the trenching machine body moves forward or backward, driving the leveling shovel to level the soil. Simultaneously, the filling mechanism is operated to push the soil into the trench. The crawler wheels then flatten the soil to complete the trench filling.

[0009] The bulldozer assembly includes a slide rail fixed to the front end of the leveler blade, a double-headed motor is fixed in the center of the inner wall of the slide rail, a lead screw is fixed to the output end of the double-headed motor, a second slider is threadedly connected to the lead screw, and a bulldozer plate is integrally formed on the second slider.

[0010] By adopting the above structure, the double-headed motor is operated to drive the lead screw to rotate. Through the threaded transmission between the second slider and the lead screw and the limitation of the second slider in the slide rail, the left and right opposite or relative movement of the two second sliders is realized. The bulldozer plate moves with the second slider to push the soil on both sides of the trench into the trench to achieve soil filling.

[0011] The lead screw and the slide rail are rotatably connected via a bearing.

[0012] With the above structure, when the lead screw rotates, the movable end of the bearing rotates with the lead screw, and the fixed end of the bearing and the slide rail are in a relatively static state, making the rotation of the lead screw smoother.

[0013] A horizontal square rod is fixed to the front end of the leveling shovel, a vertical square rod is fixed to the front end of the horizontal square rod, a second sliding rod is horizontally penetrated on the vertical square rod in the left and right directions, and the bulldozer is slidably connected to the second sliding rod.

[0014] With the above structure, the bulldozer blade moves within the track defined by the slide rail through one end of the second slider, and the other end contacts the second slide bar, sliding on the second slide bar to make the movement of the bulldozer blade more stable.

[0015] A triangular steel frame is fixed between the horizontal square rod and the soil shovel, and between the horizontal square rod and the vertical square rod through bolts.

[0016] With the above structure, the triangular steel frame supports the horizontal square rod and the vertical square rod installed with the second sliding rod, thereby improving the operating stability of the filling mechanism.

[0017] The feeding mechanism includes a mounting frame fixed to the bottom of the trencher body, the mounting frame is fixedly connected to a first motor, the output end of the first motor is fixedly connected to a first sprocket, a chain is engaged with the first sprocket, the chain is engaged with a second sprocket, the inner wall key of the second sprocket is connected to a first rotating shaft, a rotary cover is fixed to the first rotating shaft, the rotary cover is rotatably connected to a material box fixedly connected to the trencher body, and a feeding hole is provided at the bottom of the material box.

[0018] When the above structure is used and powder needs to be added to the soil to adjust the soil state, the first motor is operated to drive the first sprocket to rotate, the second sprocket rotates with the first sprocket through the chain, the first rotating shaft rotates with the second sprocket, and the rotating cover rotates with the first rotating shaft to expose the feeding hole. The powder placed in the material box is shaken out of the feeding hole into the soil due to the bumps during the operation of the trencher body, thereby adjusting the pH or physical properties of the soil to ensure the safe operation and long-term stability of the pipeline in the soil.

[0019] The feeding mechanism also includes a first fixed plate fixed in the center of the top of the material box, a second motor is fixed on the top of the first fixed plate, a partition rotatably connected to the material box is fixed to the output end of the second motor, the inner wall of the material box is divided into two material chambers by the partition, and the left and right ends of the first fixed plate are hinged with a top cover rotatably connected to the material box.

[0020] With the above structure, the partition is made of soft silicone rubber and always contacts the inner wall of the material box during rotation, dividing the material box into two material chambers, in which humic acid is placed to adjust the pH of the soil and bentonite is placed to increase the water holding capacity and fertility of the soil. The second motor drives the partition to rotate in the material box, so that different materials are aligned with the feeding holes to add materials to the soil according to different requirements. The top cover can also be rotated upward to replace or add different additives to meet the soil requirements for landfilling power pipelines.

[0021] Compared with the existing technology, this adjustable trenching device for underground power pipeline construction on different ground surfaces has the following advantages:

[0022] 1. By setting up a bulldozer component in the filling mechanism, the power of the trencher body is used to push the soil piled on the edge of the trench into the trench, and the soil is leveled by the leveling shovel. The filled soil is then compacted by the crawler wheels, saving manpower and eliminating the need for additional filling equipment, thus saving construction costs. At the same time, the crawler wheels can operate on more terrains and are flexible.

[0023] 2. By setting the first motor drive, the first sprocket, the second sprocket and the chain drive control rotary cover to open and close the feeding hole, it is possible to select whether to add additives, thereby avoiding waste or excessive addition of additives.

[0024] 3. By setting a second motor to drive the partition to rotate, and the partition divides the internal space of the material box, the material box can be loaded with additives with more functions to meet the needs of different soils for state adjustment. The type of additives dropped can be replaced during use, which can adapt to more ground surfaces.

[0025] 4. By setting the first sliding rod to increase the support force of the bulldozer plate, adding horizontal square rods, vertical square rods and triangular steel frames to increase the fixed support of the first sliding rod, the sliding operation of the filling mechanism is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the soil filling mechanism in the present invention.

[0028] Figure 3 It is a structural diagram of the first rotating pair in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the fixed block part in the present invention.

[0030] Figure 5 It is a structural schematic diagram of the soil scraper part of the present invention.

[0031] Figure 6It is a structural diagram of the feeding mechanism part of the present invention.

[0032] Figure 7 It is a structural diagram of the material box part in the present invention.

[0033] Figure 8 It is a structural schematic diagram of the partition part in the present invention.

[0034] In the figure, 1. trencher body; 101. crawler wheel; 2. feeding mechanism; 201. mounting frame; 202. first motor; 203. first sprocket; 204. chain; 205. second sprocket; 206. first rotating shaft; 207. rotating cover; 208. material box; 209. first fixing plate; 210. second motor; 211. partition; 212. top cover; 213. material chamber; 214. feeding hole; 3. filling mechanism; 301. third motor; 302. second rotating shaft; 303. connecting piece; 304. An electric telescopic rod; 305, a hollow cylinder; 306, a rotating rod; 307, a fixed block; 308, a leveling blade; 309, a first rotating pair; 310, a second electric telescopic rod; 311, a second rotating pair; 312, a first sliding block; 313, a second fixed plate; 314, a first sliding bar; 401, a sliding rail; 402, a double-headed motor; 403, a lead screw; 404, a bearing; 405, a second sliding block; 406, a bulldozer; 407, a horizontal square bar; 408, a triangular steel frame; 409, a vertical square bar; 410, a second sliding bar. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0036] like Figures 1-8As shown, the present invention is an adjustable trenching device for underground power pipeline construction on different ground surfaces, comprising a trenching machine body 1, a feeding mechanism 2 being provided at the front end of the trenching machine body 1, a filling mechanism 3 being provided at the rear end of the trenching machine body 1, a crawler wheel 101 being connected to the bottom of the trenching machine body 1 through a frame, the filling mechanism 3 comprising a third motor 301 fixed to the side of the trenching machine body 1, an output end of the third motor 301 being fixedly connected to a second rotating shaft 302, a connecting member 303 being fixedly connected to the second rotating shaft 302, a first electric telescopic rod 304 being fixed to the rear end of the connecting member 303, a hollow cylinder 305 being fixed to the movable end of the first electric telescopic rod 304, a rotating rod 306 being rotatably connected to the inner wall of the hollow cylinder 305, and the rotating rod 306 A fixed block 307 is fixed on the upper side, and a flattening shovel 308 is fixed to the rear end of the fixed block 307. The rear end of the trenching machine body 1 is rotatably connected to the second electric telescopic rod 310 through the first rotating pair 309. The movable end of the second electric telescopic rod 310 is rotatably connected to the first slider 312 through the second rotating pair 311. A first slide bar 314 is vertically passed through the top of the first slider 312. A second fixed plate 313 is fixed to both ends of the first slide bar 314. The rear end of the second fixed plate 313 is fixedly connected to the flattening shovel 308. A bulldozer assembly is provided at the front end of the flattening shovel 308. In this embodiment, the specific structure and working principle of the trenching machine body 1, the third motor 301, the first electric telescopic rod 304, and the second electric telescopic rod 310 are as follows: The principles are all existing technologies. The crawler wheels 2 are installed and connected to the trencher body 1 through a frame made of steel and bolts and are controlled by the trencher body 1. After the trencher body 1 completes the trenching of the underground electric wires, the excavated soil is filled into the trench where the power pipelines are buried. Before that, according to different soil conditions, humic acid and bentonite are mixed into the trench through the feeding mechanism 2 to adjust the acidity and alkali, or improve the physical properties of the soil. First, the third motor 301 is operated, and the third motor 301 drives the second rotating shaft 302 to rotate. The second rotating shaft 302 drives the first electric telescopic rod 304 to rotate through the connecting plate 303. The fixed block 307 and the leveling shovel 308 adjust the height as the first electric telescopic rod 304 rotates, so that the leveling shovel 308 can connect with the ground. The shovel 308 touches the ground and operates the first electric telescopic rod 304 and the second telescopic rod 302. The angle of the leveling shovel 308 and the ground is adjusted by the length difference between the first telescopic rod 304 and the second telescopic rod 302. The first slider 312 slides on the first slide bar 314 as the leveling shovel 308 moves. The first rotating pair 309 and the second rotating pair 311 rotate, and the rotation between the rotating rod 306 and the hollow cylinder 305 adapts to the changes in the height and angle of the leveling shovel 308. After the leveling shovel 308 touches the ground, the shovel 308 is driven to level the soil during the forward or backward movement of the trencher body 1. At the same time, the filling mechanism 3 is operated to push the soil into the trench. The soil is then flattened by the crawler wheels 101 to fill the trench.

[0037] The bulldozer assembly includes a slide rail 401 fixed to the front end of the leveler blade 308, a double-headed motor 402 is fixed in the center of the inner wall of the slide rail 401, a lead screw 403 is fixed to the output end of the double-headed motor 402, a second slider 405 is threadedly connected to the lead screw 403, and a bulldozer plate 406 is integrally formed on the second slider 405. In this embodiment, the double-headed motor 402 is the existing technology, and the double-headed motor 402 is operated to drive the lead screw 403 to rotate. Through the threaded transmission between the second slider 405 and the lead screw 403 and the limiting of the second slider 405 in the slide rail 401, the left and right direction or relative movement of the two second sliders 405 is realized, and the bulldozer plate 406 moves with the second slider 405 to push the soil on both sides of the groove into the groove to achieve filling.

[0038] The lead screw 403 and the slide rail 401 are rotatably connected via a bearing 404. In this embodiment, when the lead screw 403 rotates, the movable end of the bearing 404 rotates along with the lead screw 403, while the fixed end of the bearing 404 and the slide rail 401 are relatively stationary, making the rotation of the lead screw 403 smoother.

[0039] A horizontal square rod 407 is fixed to the front end of the leveler 308, a vertical square rod 409 is fixed to the front end of the horizontal square rod 407, a second slide rod 410 is horizontally passed through the vertical square rod 409 in the left and right directions, and the bulldozer 406 is slidably connected to the second slide rod 410. In this embodiment, the bulldozer 406 moves within the track defined by the slide rail 401 through one end of the second slider 405, and the other end contacts the second slide rod 410, and slides on the second slide rod 410 to make the movement of the bulldozer 406 more stable.

[0040] A triangular steel frame 408 is fixed between the horizontal square rod 407 and the leveling shovel 308 and between the horizontal square rod 407 and the vertical square rod 409 by bolts. In this embodiment, the triangular steel frame 408 supports the horizontal square rod 407 and the vertical square rod 409 equipped with the second sliding rod 410, thereby improving the operating stability of the filling mechanism 3.

[0041] The feeding mechanism 2 includes a mounting frame 201 fixed to the bottom of the trenching machine body 1, the mounting frame 201 is fixedly connected to a first motor 202, the output end of the first motor 202 is fixedly connected to a first sprocket 203, a chain 204 is engaged with the first sprocket 203, the chain 204 is engaged with a second sprocket 205, the inner wall key of the second sprocket 205 is connected to a first rotating shaft 206, a rotary cover 207 is fixed to the first rotating shaft 206, and a material box 208 fixedly connected to the trenching machine body 1 is rotatably connected to the rotary cover 207. A feeding hole 214 is provided at the bottom of the material box 208. In this embodiment, the first A motor 202 is a prior art. When powder needs to be added to the soil to adjust the soil state, the first motor 202 is operated to drive the first sprocket 203 to rotate, and the second sprocket 205 rotates with the first sprocket 203 through the chain 204. The first rotating shaft 206 rotates with the second sprocket 205, and the rotating cover 207 rotates with the first rotating shaft 206 to expose the feeding hole 214. The powder placed in the material box 208 is shaken out of the feeding hole 214 into the soil due to the bumps during the operation of the trencher body 1, thereby adjusting the pH or physical properties of the soil to ensure the safe operation and long-term stability of the pipeline in the soil.

[0042] The feeding mechanism 2 also includes a first fixed plate 209 fixed in the center of the top of the material box 208, a second motor 210 is fixed on the top of the first fixed plate 209, and a partition 211 rotatably connected to the material box 208 is fixed to the output end of the second motor 210. The inner wall of the material box 208 is divided into two material chambers 213 by the partition 211. The left and right ends of the first fixed plate 209 are hinged with a top cover 212 rotatably connected to the material box 208. In this embodiment, the second motor 210 is a prior art and will not be described in detail below. The partition 211 is a conventional method. 11 is a soft silicone rubber material that always contacts the inner wall of the material box 208 during the rotation process, dividing the material box 208 into two material chambers 213, respectively putting humic acid for adjusting the pH of the soil and bentonite for increasing the water holding capacity and fertility of the soil. The second motor 210 drives the partition 211 to rotate in the material box 208, so that different materials are aligned with the feeding hole 214 to add materials to the soil according to different requirements. The top cover 212 can also be rotated upward to replace or add different additives to meet the soil requirements for landfilling power pipelines.

[0043] The working principle of the present invention is as follows: after the trenching machine body 1 has completed the trenching for the underground electric wires, the excavated soil is filled into the trench where the power pipelines are buried. Before that, according to different soil conditions or to improve the physical properties of the soil, when powder needs to be added to the soil to adjust the soil state, the first motor 202 is operated to drive the first sprocket 203 to rotate, the second sprocket 205 rotates with the first sprocket 203 through the chain 204, the first rotating shaft 206 rotates with the second sprocket 205, and the rotating cover 207 rotates with the first rotating shaft 206 to expose the feeding hole 214, and the powder placed in the material box 208 is shaken out of the feeding hole 214 into the soil due to the bumps during the operation of the trenching machine body 1. The second motor 210 drives the partition 211 to rotate in the material box 208, so that different materials are aligned with the feeding hole 214 to add materials to the soil according to different needs. The top cover 212 can also be rotated upward to replace or add different additives. First, the third motor 301 is operated, and the third motor 301 drives the second rotating shaft 302 to rotate. The second rotating shaft 302 drives the first electric telescopic rod 304 to rotate through the connecting plate 303. The fixed block 307 and the leveling shovel 308 rotate with the first electric telescopic rod 304 to adjust the height so that the leveling shovel 308 contacts the ground. The first electric telescopic rod 304 and the second telescopic rod 302 are operated. The angle between the leveling shovel 308 and the ground is adjusted by the length difference of the rod 302. The first slider 312 slides on the first slide bar 314 as the leveling shovel 308 moves. The first rotating pair 309 and the second rotating pair 311 rotate, and the rotation between the rotating rod 306 and the hollow cylinder 305 adapts to the changes in the height and angle of the leveling shovel 308. After the leveling shovel 308 contacts the ground, the leveling shovel 308 is driven to level the soil during the forward or backward movement of the trencher body 1. The double-headed motor 402 is operated to drive the screw 403 to rotate. When the screw 403 rotates, the movable end of the bearing 404 rotates with the screw 403, and the fixed end of the bearing 404 is relatively stationary with the slide rail 401. Through the threaded transmission between the second slider 405 and the lead screw 403 and the limitation of the second slider 405 in the slide rail 401, the left and right direction or relative movement of the two second sliders 405 is realized, and the bulldozer 406 moves with the second slider 405 to push the soil on both sides of the groove into the groove. The bulldozer 406 moves within the track limited by the slide rail 401 through one end of the second slider 405, and the other end contacts the second slide bar 410 and slides on the second slide bar 410. The triangular steel frame 408 supports the horizontal square bar 407 and the vertical square bar 409 equipped with the second slide bar 410 to realize soil filling, and then the crawler wheel 101 is used to flatten the soil to realize ditch filling.

[0044] In summary, the filling mechanism and the filling mechanism can realize the filling after the pipeline is buried and the soil adjustment function for different soils.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An adjustable trenching device for underground power line construction on different ground surfaces, comprising a trenching machine body (1), characterized in that: The front end of the trenching machine body (1) is provided with a feeding mechanism (2), the rear end of the trenching machine body (1) is provided with a filling mechanism (3), the bottom of the trenching machine body (1) is connected to a crawler wheel (101) through a frame, the filling mechanism (3) includes a third motor (301) fixed to the side of the trenching machine body (1), the output end of the third motor (301) is fixedly connected to a second rotating shaft (302), the second rotating shaft (302) is fixedly connected to a connecting member (303), the rear end of the connecting member (303) is fixed to a first electric telescopic rod (304), the first electric telescopic rod (304) is fixed to the rear end of the connecting member ) The movable end is fixed with a hollow cylinder (305), the inner wall of the hollow cylinder (305) is rotatably connected to a rotating rod (306), a fixed block (307) is fixed on the rotating rod (306), and a flat soil shovel (308) is fixed to the rear end of the fixed block (307); the rear end of the trenching machine body (1) is rotatably connected to a second electric telescopic rod (310) through a first rotating pair (309), the movable end of the second electric telescopic rod (310) is rotatably connected to a first slider (312) through a second rotating pair (311), a first slider (314) is vertically passed through the top of the first slider (312), and the first A second fixed plate (313) is fixed to both ends of the slide rod (314), the rear end of the second fixed plate (313) is fixedly connected to the leveling shovel (308), and a bulldozer assembly is provided at the front end of the leveling shovel (308); the bulldozer assembly comprises a slide rail (401) fixed to the front end of the leveling shovel (308), a double-headed motor (402) is fixed in the center of the inner wall of the slide rail (401), a lead screw (403) is fixed to the output end of the double-headed motor (402), a second slide block (405) is threadedly connected to the lead screw (403), and a bulldozer plate (406) is integrally formed on the second slide block (405); The lead screw (403) and the slide rail (401) are rotatably connected via a bearing (404); a horizontal square rod (407) is fixed to the front end of the leveling shovel (308); a vertical square rod (409) is fixed to the front end of the horizontal square rod (407); a second slide rod (410) is horizontally passed through the vertical square rod (409) in the left and right directions; the bulldozer (406) is slidably connected to the second slide rod (410); a triangular steel frame (408) is fixed between the horizontal square rod (407) and the leveling shovel (308) and between the horizontal square rod (407) and the vertical square rod (409) via bolts.

2. The adjustable trenching device for underground power line construction on different ground surfaces according to claim 1, characterized in that: The feeding mechanism (2) comprises a mounting frame (201) fixed to the bottom of the trenching machine body (1); a first motor (202) is fixedly connected to the mounting frame (201); an output end of the first motor (202) is fixedly connected to a first sprocket (203); a chain (204) is meshed with the first sprocket (203); a second sprocket (205) is meshed with the chain (204); an inner wall key of the second sprocket (205) is connected to a first rotating shaft (206); and a rotating cover (207) is fixed to the first rotating shaft (206).

3. The adjustable trenching device for underground power line construction on different ground surfaces according to claim 2, characterized in that: A material box (208) fixedly connected to the trenching machine body (1) is rotatably connected to the rotary cover (207), and a feeding hole (214) is provided at the bottom of the material box (208).

4. The adjustable trenching device for underground power line construction on different ground surfaces according to claim 3, characterized in that: The feeding mechanism (2) further comprises a first fixed plate (209) fixed at the center of the top of the material box (208), a second motor (210) being fixed on the top of the first fixed plate (209), and a partition (211) rotatably connected to the material box (208) being fixed at the output end of the second motor (210).

5. The adjustable trenching device for underground power line construction on different ground surfaces according to claim 4, characterized in that: The inner wall of the material box (208) is divided into two material chambers (213) by a partition (211), and the left and right ends of the first fixed plate (209) are hinged with a top cover (212) rotatably connected to the material box (208).

Images