A construction waste crushing and recycling device for civil engineering

Abstract

The present invention discloses a construction waste crushing and recycling device for civil engineering, comprising a track, a fixed frame, a crushing and processing box, a first material receiving car and a second material receiving car arranged at intervals along the track; further comprising a dust removal mechanism, the dust removal mechanism comprising a cover plate platform, a first pipeline, a first fan, and a lifting drive assembly; the cover plate platform is vertically slidably connected to the fixed frame; a connecting cylinder is provided through the upper side of the cover plate platform, and the upper part of the connecting cylinder is vertically sleeved with the discharge cylinder; both ends of the first pipeline pass through the cover plate platform; the air inlet of the first pipeline faces the first material receiving car, and the air outlet faces the second material receiving car; the air outlet of the first fan is connected to the middle part of the first pipeline through the second pipeline; the lifting drive assembly is drivably connected to the upper side of the cover plate platform, and is used to drive the cover plate platform to cover or move away from the first material receiving car and the second material receiving car. The present invention connects the material receiving car and the crushing and processing box into a closed recycling space through the dust removal mechanism, has low recycling costs, and avoids dust leakage.

Description

Technical Field

[0001] The present invention relates to the technical field of construction waste treatment, in particular to a construction waste crushing and recycling device for civil engineering. Background Art

[0002] Civil engineering is a general term for the science and technology of building various types of land engineering facilities. During the construction or demolition of facilities, a large amount of construction waste is generated. In order to reduce the waste of resources, the construction waste is generally crushed by waste processing equipment and then recycled. The existing construction waste recycling equipment uses a crushing box for crushing, and the crushed waste falls into the receiving vehicle for recycling and reuse. A large amount of dust is generated during the crushing of the waste. The dust leaks from the inlet or outlet of the crushing box. The process of the waste falling into the receiving vehicle is easily affected by the external environment, causing unnecessary dust leakage. The leaked dust seriously affects the external environment. In order to prevent the dust from exceeding the standard, a dust filter is usually installed, and the machine needs to be shut down and the filter element needs to be replaced regularly. This undoubtedly increases the additional recycling cost and affects the normal recycling work. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the above-mentioned prior art and provide a construction waste crushing and recycling device for civil engineering, so as to solve the problems of high recycling cost and easy dust leakage in the recycling process of the existing construction waste recycling device.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A construction waste crushing and recycling device for civil engineering, comprising a track, a fixed frame, a crushing processing box, and also comprising a first material receiving car and a second material receiving car arranged at intervals along the track; the first material receiving car moves along the track to directly below the discharge barrel at the bottom of the crushing processing box; it also comprises a dust removal mechanism; the dust removal mechanism comprises a cover platform, a first pipeline, a first fan, and a lifting drive assembly; the cover platform is vertically slidably connected to the fixed frame; a connecting cylinder is provided through the upper side of the cover platform, and the upper part of the connecting cylinder is vertically sleeved with the discharge barrel; both ends of the first pipeline pass through the cover platform; the air inlet of the first pipeline faces the first material receiving car, and the air outlet faces the second material receiving car; the air outlet of the first fan is connected to the middle part of the first pipeline through the second pipeline; the lifting drive assembly is installed in the fixed frame, and the lifting drive assembly is driven and connected to the upper side of the cover platform, for driving the cover platform to cover or move away from the first material receiving car and the second material receiving car.

[0006] Furthermore, elastic support rings are provided around the tops of the first material receiving trolley and the second material receiving trolley.

[0007] Furthermore, the dust removal mechanism also includes a third pipe, which is located on the upper side of the cover platform. The air inlet of the third pipe passes through the cover platform, and the air inlet of the third pipe faces the second material receiving vehicle; the air outlet of the third pipe is connected to the interior of the first material receiving vehicle.

[0008] Furthermore, the air outlet of the third pipe passes through the outer wall of the connecting cylinder, and a through opening is provided on the side wall of the discharge cylinder; the connecting cylinder is moved vertically to connect or disconnect the air outlet of the third pipe with the through opening.

[0009] Furthermore, the air inlet of the third pipeline, the air inlet and the air outlet of the first pipeline are all provided with a first air guide hood, and the first air guide hood is connected to the lower side of the cover platform; the through port is provided with a second air guide hood, and the second air guide hood is connected to the inner wall of the discharge barrel.

[0010] Furthermore, the first pipeline includes a first inclined pipe section, the inlet of the first inclined pipe section is lower than the outlet of the first inclined pipe section; the third pipeline includes a second inclined pipe section, the inlet of the second inclined pipe section is higher than the outlet of the second inclined pipe section.

[0011] Furthermore, the lifting drive assembly includes a lifting motor, a reel, and a bracket; the reel is arranged along the front and rear directions, and the two ends of the reel are rotatably connected to the bracket through bearings, and the bracket is connected to the fixed frame; a rope is wrapped around the reel, and the outer end of the rope is vertically connected to the cover platform; the lifting motor is driven and connected to one end of the reel, and the lifting motor drives the cover platform to move in the up and down directions through the rope.

[0012] Furthermore, it also includes a material blocking assembly, which includes a material blocking plate and a push rod; two material blocking plates and two push rods are symmetrically arranged; the upper ends of the material blocking plates are respectively hinged to the inner walls of the discharge barrel; the lower ends of the push rods are connected to the lower side of the cover platform, and the upper ends of the push rods extend into the connecting barrel; the vertically moving cover platform drives the upper ends of the push rods to move away from or abut against the free ends of the material blocking plates.

[0013] The present invention has the following beneficial effects:

[0014] The present invention's construction waste crushing and recycling device includes a track, a fixed frame, a crushing and processing box, and a dust removal mechanism. The dust removal mechanism includes a cover platform, a first pipeline, and a first fan. A lifting drive assembly drives the cover platform to cover a first and second receiving carts. The first fan blows air, causing unsettled dust in the first receiving cart to enter the second receiving cart through the first pipeline for settling. During the receiving process, dust is repeatedly settled within the carts, improving the waste recovery rate and preventing environmental contamination from waste dust. The device eliminates the need for additional dust filtration devices and frequent replacement of maintenance items such as dust filter elements, resulting in a low-cost and easy-to-maintain device.

[0015] 2. A third pipe is set on the upper side of the cover platform. Under the action of the first fan, the unsettled dust in the second receiving car returns to the first receiving car through the third pipe, so that the dust is settled multiple times, further improving the waste recovery efficiency.

[0016] 3. The air inlet of the third pipeline, the air inlet and the air outlet of the first pipeline are all provided with a first air guide cover, which reduces the flow rate of the gas-material mixture at the air inlet of the first pipeline and the air inlet of the third pipeline, so that the gas-material mixture settles in different directions, thereby improving the settling efficiency.

[0017] 4. Both the first and third pipelines are provided with inclined pipe sections, which facilitate the rapid passage of the gas-material mixture through the pipelines and prevent the gas-material mixture from remaining in the pipelines and blocking the passages.

[0018] 5. Two baffle plates are hinged on the inner wall of the discharge barrel, and the lower side of the cover platform is connected to the push rod. Move the cover platform so that the push rod abuts against the two baffle plates to close the internal channel of the discharge barrel, so that the discharge barrel stops discharging materials, avoiding the waste of materials scattered to the outside of the receiving cart when the second receiving cart is moved to replace the first receiving cart. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 It is the front view of the present invention;

[0021] Figure 2 It is a right side view of the present invention;

[0022] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0023] Figure 4 This is a schematic structural diagram of the dust removal mechanism of the present invention when covering the material receiving vehicle;

[0024] Figure 5 for Figure 3 A partial enlarged view of the middle A;

[0025] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0026] Figure 7 A top view of the dust removal mechanism of the present invention;

[0027] Figure 8 This is a front view of the dust removal mechanism of the present invention;

[0028] Figure 9 It is a schematic diagram of the three-dimensional structure of the dust removal mechanism of the present invention.

[0029] In the figure, 1. track; 2. fixed frame; 3. crushing processing box; 31. discharge barrel; 4. first material receiving cart; 5. second material receiving cart; 6. dust removal mechanism; 61. cover platform; 611. sleeve; 612. guide column; 62. connecting cylinder; 63. first pipeline; 631. first inclined pipe section; 64. first fan; 65. lifting drive assembly; 651. lifting motor; 652. reel; 653. bracket; 654. rope; 66. second pipeline; 67. third pipeline; 671. second inclined pipe section; 68. first air guide hood; 69. second air guide hood; 71. material baffle; 72. ejector rod. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0031] like Figure 1-9 As shown, the present invention provides a construction waste crushing and recycling device for civil engineering, including a track 1, a fixed frame 2, and a crushing and processing box 3. The crushing and processing box 3 is connected to the fixed frame 2, and the track 1 is laid under the crushing and processing box 3. It also includes a first material receiving car 4 and a second material receiving car 5 arranged at intervals along the track 1; the first material receiving car 4 moves along the track 1 to directly below the discharge barrel 31 at the bottom of the crushing and processing box 3; it can be understood that when it is necessary to receive materials, the two material receiving cars are pushed to move along the track 1, so that the first material receiving car 4 moves to the bottom of the crushing and processing box 3 and then stops, and the second material receiving car 5 moves to the side of the first material receiving car 4 and then stops, and the two material receiving cars are spaced a proper distance apart from each other.

[0032] The device of the present invention also includes a dust removal mechanism 6; the dust removal mechanism 6 includes a cover platform 61, a first pipe 63, a first fan 64, and a lifting drive assembly 65; the cover platform 61 is vertically slidably connected to the fixed frame 2; specifically, a sleeve 611 is provided at the four corners of the cover platform 61, and each sleeve 611 is sleeved with a guide column 612, and the guide column 612 slides with the sleeve 611; the bottom end of the guide column 612 passes through the cover platform 61 from the sleeve 611, and the bottom end of the guide column 612 is provided with a thread, and the threaded end of the guide column 612 is installed with a limit nut, and the cover platform 61 is pressed down on the limit nut; the guide column 612 is vertically arranged, and a crossbeam is provided in the fixed frame 2, and the top of the guide column 612 is connected to the crossbeam; when the cover platform 61 is moved vertically, the cover platform 61 can be moved along the guide column 612, and the guide column 612 limits the cover platform 61 to only move vertically.

[0033] A connecting tube 62 is provided on the upper side of the cover platform 61, and the upper part of the connecting tube 62 is vertically sleeved with the discharge barrel 31; in this embodiment, the connecting tube 62 is sleeved on the outside of the discharge barrel 31; when the first material receiving vehicle 4 moves to the bottom of the discharge barrel 31, the first material receiving vehicle 4 is in the material receiving position; it can be understood that the material crushed by the crushing processing box 3 enters the connecting tube 62 from the discharge barrel 31, and freely falls into the first material receiving vehicle 4 from the bottom of the connecting tube 62 through the cover platform 61.

[0034] A first conduit 63 is provided on the upper side of the cover plate platform 61, with both ends of the first conduit 63 extending through the cover plate platform 61. The air inlet of the first conduit 63 faces the first receiving cart 4, and the air outlet faces the second receiving cart 5. The first receiving cart 4 is moved below the discharge cylinder 31, and the second receiving cart 5 is parked next to the first receiving cart 4 at a predetermined distance. At this point, the first receiving cart 4 is in the receiving position, and the second receiving cart 5 is in the waiting position. At this point, the cover plate platform 61 is moved vertically, driving the air inlet of the first conduit 63 to move vertically above the first receiving cart 4, and driving the air outlet of the first conduit 63 to move vertically above the second receiving cart 5.

[0035] When the cover platform 61 covers the entrances of the first material receiving cart 4 and the second material receiving cart 5, the interiors of the first material receiving cart 4 and the second material receiving cart 5 are connected by the first pipe 63, and the discharge cylinder 31 of the crushing processing box 3 is surrounded by the connecting cylinder 62, that is, the crushing processing box 3 is connected with the first material receiving cart 4 and the second material receiving cart 5 to form a waste recycling space. The process of the crushed waste falling into the first material receiving cart 4 is not affected by the external environment, which improves the waste recovery rate and reduces the leakage of dust.

[0036] A first fan 64 is arranged on the upper side of the cover platform 61, and the air outlet of the first fan 64 is connected to the middle part of the first pipe 63 through the second pipe 66; the air outlet of the second pipe 66 faces the air outlet of the first pipe 63, and the air inlet of the second pipe 66 faces the air inlet of the first pipe 63, and the central axis of the second pipe 66 forms an acute angle with the central axis of the first pipe 63.

[0037] When the first fan 64 is started, it conveys external air into the second pipe 66. The airflow in the second pipe 66 flows toward the air outlet of the first pipe 63, driving the directional flow of the air in the first pipe 63. When the cover platform 61 covers the inlet of the first and second receiving carts 4 and 5 to receive materials, under the action of the first fan 64, the air in the first receiving cart 4 enters the second receiving cart 5 through the first pipe 63. The unsettled dust in the first receiving cart 4 mixes with the airflow and enters the first pipe 63. It then enters the second receiving cart 5 through the air outlet of the first pipe 63 for sedimentation. At the same time, the flow of air in the first receiving cart 4 drives the flow of air in the discharge barrel 31, causing the crushed material to fall quickly and directional into the first receiving cart 4.

[0038] In summary, the construction waste recycling process of the present invention does not require the installation of additional dust filtering devices to prevent excessive dust in the external environment, and workers do not need to frequently shut down the machine to replace maintenance parts such as dust filter elements, thereby reducing the overall cost of the device and improving the recycling efficiency.

[0039] like Figure 2-4 As shown, the lifting drive assembly 65 is installed in the fixed frame 2, and the lifting drive assembly 65 is connected to the upper side of the cover platform 61 for driving the cover platform 61 to cover or move away from the first material receiving vehicle 4 and the second material receiving vehicle 5.

[0040] Specifically, the lifting drive assembly 65 includes a lifting motor 651, a drum 652, and a bracket 653; the drum 652 is arranged along the front and rear directions, and the two ends of the drum 652 are respectively connected to the bracket 653 through bearings, the fixed frame 2 is provided with a supporting beam, and the bracket 653 is connected to the supporting beam; a rope 654 is wrapped around the drum 652, and the outer end of the rope 654 is connected to the cover platform 61 along the vertical direction; the lifting motor 651 is driven and connected to one end of the drum 652, and the lifting motor 651 drives the cover platform 61 to move in the up and down directions through the rope 654.

[0041] To prevent dust from leaking out of the inlet of the receiving trolley during material collection, elastic support rings (not shown) are installed around the top of the first and second receiving trolleys 4, 5. When the cover platform 61 covers the first and second receiving trolleys 4, 5, it contacts the support rings, reducing collision contact. At the same time, the support rings act as a seal, preventing material from leaking from the first and second receiving trolleys 4, 5 through gaps in the cover, thus protecting the external environment from dust contamination.

[0042] like Figure 3 、 7 As shown, the dust removal mechanism 6 also includes a third pipe 67, which is located on the upper side of the cover platform 61. The air inlet of the third pipe 67 passes through the cover platform 61, and the air inlet of the third pipe 67 faces the second material receiving vehicle 5; the air outlet of the third pipe 67 is connected to the interior of the first material receiving vehicle 4.

[0043] When the cover platform 61 covers the first receiving car 4 and the second receiving car 5 to receive materials, the first fan 64 is started, so that the gas-material mixture in the first receiving car 4 enters the second receiving car 5 through the first pipe 63 for sedimentation. At this time, the internal pressure of the second receiving car 5 increases, and the internal pressure of the first receiving car 4 decreases. The resulting pressure difference causes the dust that has not settled in the second receiving car 5 to enter the third pipe 67 and return to the first receiving car 4 from the air outlet of the third pipe 67. It can be understood that the material after being crushed by the crushing treatment box 3 first enters the first receiving car 4 for sedimentation, then enters the second receiving car 5, and finally returns to the first receiving car 4 for further sedimentation. During the entire receiving process, dust is controlled within the receiving car, achieving a dust-free receiving process, greatly reducing the impact of the construction waste crushing process on the environment and meeting environmental protection requirements. The crushed construction waste is completely recycled, which is highly economical.

[0044] Preferably, the air inlet of the third pipe 67 is away from the air outlet of the first pipe 63, and the air inlet of the third pipe 67 is close to the first material receiving cart 4; that is, when the first material receiving cart 4 is in the material receiving position and the second material receiving cart 5 is in the waiting position for material receiving, the air inlet of the third pipe 67 and the air outlet of the first pipe 63 are both located above the second material receiving cart 5; when the cover platform 61 covers the second material receiving cart 5, the air inlet of the third pipe 67 and the air outlet of the first pipe 63 are located in different areas of the inlet of the second material receiving cart 5; the gas-material mixture at the air outlet of the first pipe 63 is effectively settled in the second material receiving cart 5, avoiding the gas-material mixture from flowing to the air inlet of the third pipe 67 before it has time to settle, and returning to the first material receiving cart 4 from the air outlet of the third pipe 67, causing the first fan 64 to do a lot of useless work.

[0045] In order to reduce the airflow of the air outlet of the third pipe 67 from disturbing the sedimentation of the materials in the first receiving vehicle 4, the position of the air outlet of the third pipe 67 is optimized. Figure 3 、 7 As shown in , 8 , the air outlet of the third pipe 67 passes through the outer wall of the connecting tube 62 , and a through opening is provided on the side wall of the discharge cylinder 31 , which is compatible with the air outlet of the third pipe 67 .

[0046] The lifting drive assembly 65 drives the cover platform 61 to move, and the cover platform 61 drives the connecting tube 62 to slide vertically downward along the discharge barrel 31. When the cover platform 61 covers the first material receiving cart 4 and the second material receiving cart 5 to receive materials, the air outlet and the through port of the third pipe 67 are completely connected, and the gas in the third pipe 67 flows into the discharge barrel 31 through the through port and flows to the first material receiving cart 4; when the cover platform 61 is away from the first material receiving cart 4 and the second material receiving cart 5, the cover platform 61 drives the connecting tube 62 to slide vertically upward along the discharge barrel 31, and the passage between the air outlet and the through port of the third pipe 67 slowly decreases until it is completely disconnected.

[0047] With this design, the air outlet of the third pipe 67 is far away from the air inlet of the first pipe 63, avoiding the ineffective circulation of dust in the third pipe 67 and the first pipe 63, which affects normal sedimentation; at the same time, it avoids the influence of the gas-material mixture ejected from the air outlet of the third pipe 67 on the material in the first material receiving vehicle 4, which is conducive to the rapid sedimentation of the material in the first material receiving vehicle 4.

[0048] like Figure 6 、 8 As shown, the air inlet of the third pipe 67, the air inlet and air outlet of the first pipe 63 are all provided with a first air guide hood 68, and the first air guide hood 68 is connected to the lower side of the cover platform 61; the through opening is provided with a second air guide hood 69, and the second air guide hood 69 is connected to the inner wall of the discharge barrel 31.

[0049] The first air guide 68 is used to reduce the flow rate of the gas-material mixture at the air inlet of the first duct 63 and the air inlet of the third duct 67, preventing excessive dust from being drawn into the first duct 63 and the third duct 67 and adding unnecessary load to the first blower 64. The first air guide 68 is also used to reduce the flow rate of the gas-material mixture at the air outlet of the first duct 63. The first air guide 68 is provided with multiple air ducts in different directions, which guide the flow of the gas-material mixture in different directions, reducing the flow rate and causing the gas-material mixture to settle in different directions, thereby improving settling efficiency.

[0050] The second air guide hood 69 is used to reduce the flow rate of the gas-material mixture entering the discharge barrel 31; the second air guide hood 69 is provided with multiple air passages in different directions, which guide the flow of the gas-material mixture in different directions, thereby reducing the disturbance of this part of the gas-material mixture to the material in the discharge barrel 31.

[0051] like Figure 8 As shown, the first conduit 63 includes a first oblique section 631, the inlet of which is lower than its outlet. This facilitates the rapid flow of the gas-material mixture within the first conduit 63 and prevents the gas-material mixture from remaining in the first conduit 63, hindering normal flow and increasing the load on the first fan 64. The third conduit 67 includes a second oblique section 671, the inlet of which is higher than its outlet. This facilitates the rapid passage of the gas-material mixture through the third conduit 67 and prevents the gas-material mixture from remaining in the third conduit 67 and clogging the conduit.

[0052] like Figure 5 、 6As shown, the device of the present invention also includes a material baffle assembly, which includes a material baffle plate 71 and a push rod 72; two material baffle plates 71 and two push rods 72 are symmetrically arranged; the upper ends of the material baffle plates 71 are respectively hinged to the inner walls of the discharge barrel 31; the free ends of the two material baffle plates 71 are tilted downward and placed inside the discharge barrel 31, and the two material baffle plates 71 are rotated toward each other, and the free ends of the two material baffle plates 71 are abutted. At this time, the internal channel of the discharge barrel 31 is closed by the two material baffle plates 71, and the two material baffle plates 71 play a role in preventing materials from falling.

[0053] The lower end of the push rod 72 is connected to the lower side of the cover plate platform 61, and the upper end of the push rod 72 extends into the connecting tube 62; when the lifting drive assembly 65 drives the cover plate platform 61 to move upward, the push rod 72 moves with the cover plate platform 61, and the upper end of the push rod 72 moves upward and abuts the free end of the baffle plate 71. The baffle plate 71 slowly rotates as the push rod 72 moves upward. When the free ends of the two baffle plates 71 abut against each other, the drive stops. At this time, the internal channel of the discharge barrel 31 is closed, and no longer feeds material into the first receiving car 4. Then, the second receiving car 5 is moved to replace the first receiving car 4 to wait for material, and the first receiving car 4 is moved out for unloading. Correspondingly, when the lifting drive assembly 65 drives the cover plate platform 61 downward in the reverse direction, the free ends of the two baffle plates 71 are separated, and the crushed material falls back into the receiving car.

[0054] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are intended only to describe the present invention and do not require that the present invention must be constructed or operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense. For example, they can be connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0055] The above description is a preferred embodiment of the present invention, and the description of the specific embodiment is only for a better understanding of the concept of the present invention. For those skilled in the art, according to the principles of the present invention, several improvements or equivalent substitutions can be made, and these improvements or equivalent substitutions are also considered to fall within the scope of protection of the present invention.

Claims

1. A construction waste crushing and recycling device for civil engineering, comprising a track (1), a fixed frame (2), and a crushing and processing box (3), characterized in that: The machine also includes a first material receiving vehicle (4) and a second material receiving vehicle (5) arranged at intervals along the track (1); the first material receiving vehicle (4) moves along the track (1) to the position directly below the discharge barrel (31) at the bottom of the crushing treatment box (3); and further includes a dust removal mechanism (6); the dust removal mechanism (6) includes a cover plate platform (61), a first pipe (63), a first fan (64), and a lifting drive assembly (65); the cover plate platform (61) is vertically slidably connected to the fixed frame (2); a connecting barrel (62) is provided on the upper side of the cover plate platform (61), and the upper portion of the connecting barrel (62) is vertically sleeved with the discharge barrel (31); Both ends of the first pipe (63) pass through the cover plate platform (61); the air inlet of the first pipe (63) faces the first material receiving vehicle (4), and the air outlet faces the second material receiving vehicle (5); the air outlet of the first fan (64) is connected to the middle part of the first pipe (63) through the second pipe (66); the lifting drive assembly (65) is installed in the fixed frame (2), and the lifting drive assembly (65) is connected to the upper side of the cover plate platform (61) for driving the cover plate platform (61) to cover or move away from the first material receiving vehicle (4) and the second material receiving vehicle (5); The dust removal mechanism (6) further comprises a third pipe (67), the third pipe (67) being located on the upper side of the cover plate platform (61), the air inlet of the third pipe (67) penetrating the cover plate platform (61), the air inlet of the third pipe (67) facing the second material receiving vehicle (5); and the air outlet of the third pipe (67) communicating with the interior of the first material receiving vehicle (4).

2. The construction waste crushing and recycling device for civil engineering according to claim 1, characterized in that: Elastic support rings are provided around the tops of the first material receiving trolley (4) and the second material receiving trolley (5).

3. The construction waste crushing and recycling device for civil engineering according to claim 1, characterized in that: The air outlet of the third pipe (67) passes through the outer wall of the connecting cylinder (62), and the side wall of the discharge cylinder (31) is provided with a through opening; the connecting cylinder (62) is moved vertically to connect or disconnect the air outlet of the third pipe (67) with the through opening.

4. The construction waste crushing and recycling device for civil engineering according to claim 3, characterized in that: The air inlet of the third pipe (67), the air inlet and the air outlet of the first pipe (63) are all provided with a first air guide cover (68), and the first air guide cover (68) is connected to the lower side of the cover plate platform (61); the through port is provided with a second air guide cover (69), and the second air guide cover (69) is connected to the inner wall of the discharge barrel (31).

5. The construction waste crushing and recycling device for civil engineering according to claim 1, characterized in that: The first pipeline (63) includes a first inclined pipe section (631), the inlet of the first inclined pipe section (631) is lower than the outlet of the first inclined pipe section (631); the third pipeline (67) includes a second inclined pipe section (671), the inlet of the second inclined pipe section (671) is higher than the outlet of the second inclined pipe section (671).

6. The construction waste crushing and recycling device for civil engineering according to claim 1, characterized in that: The lifting drive assembly (65) includes a lifting motor (651), a reel (652), and a bracket (653); the reel (652) is arranged along the front-back direction, and both ends of the reel (652) are rotatably connected to the bracket (653) through bearings, and the bracket (653) is connected to the fixed frame (2); A rope (654) is wound around the drum (652), and the outer end of the rope (654) is vertically connected to the cover platform (61); a lifting motor (651) is drivingly connected to one end of the drum (652), and the lifting motor (651) drives the cover platform (61) to move in the up and down directions through the rope (654).

7. The construction waste crushing and recycling device for civil engineering according to claim 1, characterized in that: The material blocking assembly further comprises a material blocking plate (71) and a push rod (72); two material blocking plates (71) and two push rods (72) are symmetrically arranged; the upper ends of the material blocking plates (71) are respectively hinged to the inner walls of the discharge barrel (31); the lower ends of the push rods (72) are connected to the lower side of the cover plate platform (61), and the upper end of the push rod (72) extends into the connecting barrel (62); the vertically movable cover plate platform (61) drives the upper end of the push rod (72) to move away from or abut against the free end of the material blocking plate (71).

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