A raw material feeding device for a construction site

Abstract

The application discloses a raw material feeding device for a construction site, which comprises a counterweight seat, a plurality of universal wheels are installed at the middle part of the lower side of the counterweight seat, a lifting assembly is installed at the edge of the counterweight seat, a material lifting assembly is installed at the upper side of the counterweight seat in an inclined mode, a crushed material assembly is installed at the upper side of the bottom of the material lifting assembly, materials are put into a hopper, a third motor drives two crushing rollers to rotate towards each other, so that large block materials entering the hopper can be crushed, the crushed materials enter a feeding cylinder, a second motor drives a central shaft to rotate, the central shaft drives helical leaves to rotate, the helical leaves helically convey the materials upwards into a feeding inlet, so that the materials enter a column cylinder through the feeding inlet, simultaneously, the central shaft drives a driving bevel gear to rotate, the driving bevel gear meshes with a transmission bevel gear to drive the transmission bevel gear to rotate, the transmission bevel gear drives a shaft rod to rotate through a belt wheel transmission mechanism, the shaft rod drives a spoke disc to rotate, and then a scraper can continuously scrape the materials in the column cylinder.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, specifically a raw material feeding device for construction sites. Background Technology

[0002] Ordinary concrete refers to artificial stone made by mixing cement as the main binder with water, sand, and gravel, and, when necessary, chemical admixtures and mineral admixtures, in appropriate proportions, and then uniformly mixing, compacting, molding, and curing. Concrete is mainly divided into two stages and states: the plastic state before setting and hardening, i.e., fresh concrete or concrete mixture, and the hard state after hardening, i.e., hardened concrete or concrete. The strength grade of concrete is classified according to the standard value of cubic compressive strength. In China, the strength grade of ordinary concrete is divided into 14 grades, namely C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, and C80. The higher the strength grade of concrete, the more stringent the requirements for the particle size of aggregates. Therefore, under normal circumstances, the aggregates need to be crushed and screened before being fed into the concrete to ensure the quality of the concrete.

[0003] Chinese Patent Publication No. CN116689130B discloses a feeding device for crushing building materials, relating to the field of feeding machines. It includes a discharge port at the upper end of a conveying pipe, a connecting pipe fixedly connected to the lower end of the conveying pipe, and a main housing fixedly connected to the end of the conveying pipe away from the discharge port. The connecting pipe is fixedly connected to the side wall of the main housing. This feeding device for crushing building materials incorporates a buffer device. When the building material enters the main housing, a second motor drives a buffer plate to rotate, slowing the falling speed of the building material and reducing its impact on the main housing. Simultaneously, a water inlet connects to a water source, and water enters a water collection tank through a water channel. Water is then sprayed from a nozzle through the water collection tank to spray and reduce dust on the falling building material. Screening and conveying of the building material can be achieved through a screen plate and a lifting mechanism, thereby improving crushing efficiency. Combined with a control moving device and a lifting device, this feeding device can be used with different crushers.

[0004] The above-mentioned technology achieves the conveying and feeding of smaller materials by repeatedly pressing and screening them. However, the screening efficiency is low, it is prone to clogging, the dust reduction effect is poor, and the water consumption is high. Therefore, this invention discloses a raw material feeding device for construction sites to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the problems of low screening efficiency, easy clogging, poor dust reduction effect and large water consumption of traditional material crushing and feeding equipment. The present invention provides a raw material feeding device for construction sites, thereby solving the above problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a raw material feeding device for construction sites, comprising a counterweight base, a plurality of casters mounted on the lower center of the counterweight base, a lifting component mounted on the edge of the counterweight base, an inclined lifting component mounted on the upper side of the counterweight base, a crushing component mounted on the upper bottom of the lifting component, a screening component mounted on the top of the lifting component, an inlet pipe allowing small pieces of material to pass through the bottom of the screening component, return pipes for conveying large pieces of material mounted at both ends of the screening component, the bottom end of the return pipe extending into the crushing component, and dust suppression components connected between both ends of the screening component and the adjacent return pipe.

[0007] Furthermore, the height of the screening assembly is greater than the height of the crushing assembly, so that the tilt angle of the return pipe is between 30° and 45°.

[0008] Furthermore, the material lifting assembly includes a first support plate and a second support plate fixed on the upper side of the counterweight base. A second motor is screwed onto the first support plate. An inclined material conveying cylinder is fixedly connected to the top of the second support plate. A central shaft is rotatably connected between the inner walls of the two ends of the material conveying cylinder. A spiral blade is fixedly connected to the outer side of the central shaft. The bottom end of the central shaft passes through the material conveying cylinder and the first support plate and is fixedly connected to the output shaft of the second motor. A discharge port is opened on the lower side of the top end of the material conveying cylinder, and an inlet is fixedly embedded on the upper side of the bottom end of the material conveying cylinder.

[0009] Furthermore, the screening assembly includes a column fixedly sleeved on the outer side of the bottom end of the feed inlet, a material gathering hopper in the middle of the column, a feed pipe fixed at the bottom end of the material gathering hopper, and an arc-shaped mesh fixedly embedded at the top of the material gathering hopper. The top ends of the two return pipes are respectively fixedly embedded on the lower sides of both ends of the column. A shaft is rotatably connected between the inner walls of both ends of the column. A spoke is fixedly connected to the outer side of the shaft. Multiple scrapers are fixedly connected between the spokes. Both ends of the shaft extend out of the column.

[0010] Furthermore, the screening assembly also includes a first transmission box located above the conveying cylinder. Second transmission boxes are fixed to both sides of the first transmission box. A first transmission shaft is rotatably connected between the inner walls of the two sides of the first transmission box. A transmission bevel gear is fixedly sleeved on the outer side of the middle portion of the first transmission shaft. The transmission bevel gear meshes with a driving bevel gear. The driving bevel gear is fixedly connected to a central shaft extending into the first transmission box. Both ends of the first transmission shaft extend into adjacent second transmission boxes, and a first transmission wheel is fixedly sleeved on the portion of the first transmission shaft located within the second transmission box. A second transmission wheel is disposed below each of the first transmission wheels. A transmission belt drives between the first and second transmission wheels, and the second transmission wheel is fixedly connected to a shaft extending into the second transmission box.

[0011] Furthermore, the dust suppression assembly includes a duct fixedly connected between the column and the second transmission box. A one-way valve is installed in the outlet end of the duct. The inlet end of the duct is fixedly connected to the outlet of the cyclone dust collector. The inlet end of the cyclone dust collector is connected to the return pipe. A shaft runs through the middle of the duct, and multiple fan blades are equidistantly arranged on the outer side of the portion of the shaft inside the duct.

[0012] Furthermore, the crushing assembly includes a crushing box fixedly connected to the discharge port, two crushing rollers rotatably connected between the inner walls of the two sides of the crushing box, two third motors fixedly connected to the outer side of the crushing box, the output ends of the two third motors passing through the crushing box and fixedly connected to the adjacent crushing rollers, and a feed hopper fixedly embedded on the upper side of the crushing box, the feed hopper being connected to the bottom end of the return pipe.

[0013] Furthermore, the lifting assembly includes an annular empty box fixed to the upper side of the counterweight seat and a first motor fixed to the upper side of the annular empty box. Multiple vertical shafts are rotatably connected between the upper and lower inner walls of the annular empty box. The output end of the first motor is fixedly connected to one of the vertical shafts. A sprocket and a worm are fixedly sleeved on the outer side of the vertical shaft. The multiple sprockets are connected to each other by a transmission chain. Each worm is connected to a worm wheel. Each worm wheel is rotatably connected to the bottom wall of the annular empty box. An internal thread is opened in the middle of the worm wheel. The internal thread is adapted to connect to a lead screw. The bottom end of the lead screw extends out of the annular empty box and is fixedly connected to the same annular plate. The bottom end of each lead screw extends out of the counterweight seat and is fixed with a column foot.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. This invention provides a raw material feeding device for construction sites. Material is added to the hopper, and a third motor drives two crushing rollers to rotate in opposite directions, crushing large pieces of material. After crushing, the material enters the conveying cylinder. A second motor drives a central shaft to rotate, which in turn drives a spiral blade to rotate. The spiral blade spirals upwards, conveying the material into the feed inlet, allowing it to enter the column cylinder. Simultaneously, the central shaft drives a drive bevel gear to rotate, which meshes with a transmission bevel gear. The transmission bevel gear, via a belt pulley transmission mechanism, drives a shaft to rotate, which in turn drives a spoke to rotate. This allows a scraper to continuously scrape up the material inside the column cylinder. Under gravity, the material is lifted and tumbles down. Small pieces of material can pass through an arc-shaped mesh and fall into the concrete mixing equipment through the feed pipe, while large pieces are blocked by the arc-shaped mesh and cannot fall until they roll to the end of the column cylinder. From there, they can roll back into the hopper through the return pipe for secondary crushing, ensuring the uniformity of the material particles and preventing large pieces from affecting the quality of the concrete.

[0016] 2. The present invention provides a raw material feeding device for construction sites. The shaft drives the fan blades to rotate continuously, which can centrifugally throw out air through a one-way valve. This allows the air in the cyclone dust collector to be continuously absorbed, thereby generating centrifugal wind in the cyclone dust collector. The external airflow continuously enters the cyclone dust collector through the return pipe and the inlet pipe, so that the dust carried by the airflow can be centrifugally settled, which can eliminate dust pollution caused by raw material feeding. After the equipment has been running for a period of time, waste materials can be collected simply by opening the material outlet of the cyclone dust collector.

[0017] 3. The present invention provides a raw material feeding device for construction sites. After the feeding device is pushed to the processing position, the first motor drives the vertical shaft to rotate. After chain transmission, multiple sprockets rotate synchronously, so that the worm can drive the worm wheel to rotate. The internal thread structure in the worm wheel can drive the lead screw to move downward, thereby raising the height of the counterweight seat, so that the caster wheel is suspended in the air, which can fully position the counterweight seat and prevent the feeding device from shifting during operation. Attached Figure Description

[0018] Figure 1 This is a side sectional view of a raw material feeding device for construction sites according to the present invention.

[0019] Figure 2 This is a side view of a raw material feeding device for construction sites according to the present invention;

[0020] Figure 3 This invention provides a raw material feeding device for construction sites. Figure 1 Enlarged view of the structure at point A in the image;

[0021] Figure 4 This invention provides a raw material feeding device for construction sites. Figure 1 Enlarged view of the structure at point B in the image;

[0022] Figure 5 This invention provides a raw material feeding device for construction sites. Figure 2 Enlarged view of the structure at point C in the image;

[0023] Figure 6 This is a cross-sectional view of the internal structure of a screening component in a raw material feeding device for construction sites according to the present invention.

[0024] Figure 7 This is a cross-sectional view of the internal structure of a dust suppression component in a raw material feeding device for construction sites according to the present invention.

[0025] Figure 8 This is a structural exploded view of the second transmission box in a raw material feeding device for construction sites according to the present invention.

[0026] The attached figures are labeled as follows:

[0027] 1. Counterweight base; 2. Lifting assembly; 3. Material lifting assembly; 4. Crushing assembly; 5. Screening assembly; 6. Feed pipe; 7. Return pipe; 8. Dust suppression assembly;

[0028] 11. Casters;

[0029] 21. Annular empty box; 22. First motor; 23. Vertical shaft; 24. Sprocket; 25. Worm gear; 26. Worm wheel; 27. Lead screw; 28. Annular plate; 29. ​​Column base;

[0030] 31. First support plate; 32. Second support plate; 33. Feed cylinder; 34. Central shaft; 35. Spiral blade; 36. Second motor; 331. Discharge port; 332. Inlet port;

[0031] 41. Crushing box; 42. Crushing roller; 43. Third motor; 44. Feed hopper;

[0032] 51. Column cylinder; 52. Gathering hopper; 53. Arc-shaped mesh; 54. Shaft; 55. Spoke; 56. Scraper; 57. First transmission box; 58. Second transmission box; 571. First transmission shaft; 572. Transmission bevel gear; 573. Drive bevel gear; 581. First transmission wheel; 582. Second transmission wheel; 583. Transmission belt;

[0033] 81. Air duct; 82. One-way valve; 83. Cyclone dust collector; 84. Fan blade. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: As Figures 1 to 8 As shown, this embodiment discloses a raw material feeding device for construction sites, including a counterweight 1, and a plurality of casters 11 are installed on the lower center of the counterweight 1;

[0036] Specifically, the caster wheel 11 facilitates the displacement of the raw material feeding device.

[0037] Furthermore, a lifting assembly 2 is installed at the edge of the counterweight 1. The lifting assembly 2 includes an annular empty box 21 fixed on the upper side of the counterweight 1 and a first motor 22 fixed on the upper side of the annular empty box 21. Multiple vertical shafts 23 are rotatably connected between the upper and lower inner walls of the annular empty box 21. The output end of the first motor 22 is fixedly connected to one of the vertical shafts 23. A sprocket 24 and a worm gear 25 are fixedly sleeved on the outer side of the vertical shaft 23. Multiple sprockets 24 are connected to each other by a transmission chain. Each worm gear 25 is connected to a worm wheel 26. Each worm wheel 26 is rotatably connected to the bottom wall of the annular empty box 21. The worm wheel 26 has an internal thread in the middle, which is adapted to connect to a lead screw 27. The bottom end of the lead screw 27 extends out of the annular empty box 21 and is fixedly connected to the same annular plate 28. The bottom end of each lead screw 27 extends out of the counterweight 1 and is fixed with a column foot 29.

[0038] Specifically, the first motor 22 drives the vertical shaft 23 to rotate. After being driven by the chain, multiple sprockets 24 rotate synchronously, which allows the worm gear 25 to drive the worm wheel 26 to rotate. The internal thread structure in the worm wheel 26 can drive the lead screw 27 to move downward, thereby raising the height of the counterweight seat 1 and making the caster wheel 11 suspended in the air. This allows the counterweight seat 1 to be positioned fully, preventing the feeding device from shifting during operation.

[0039] Furthermore, an inclined material lifting assembly 3 is installed on the upper side of the counterweight 1. The material lifting assembly 3 includes a first support plate 31 and a second support plate 32 fixed on the upper side of the counterweight 1. A second motor 36 is screwed on the first support plate 31. An inclined material conveying cylinder 33 is fixedly connected to the top of the second support plate 32. A central shaft 34 is rotatably connected between the inner walls of the two ends of the material conveying cylinder 33. A spiral blade 35 is fixedly connected to the outer side of the central shaft 34. The bottom end of the central shaft 34 passes through the material conveying cylinder 33 and the first support plate 31 and is fixedly connected to the output shaft of the second motor 36. A discharge port 331 is opened on the lower side of the top end of the material conveying cylinder 33, and an inlet port 332 is fixedly embedded on the upper side of the bottom end of the material conveying cylinder 33.

[0040] Specifically, the second motor 36 drives the central shaft 34 to rotate, the central shaft 34 drives the spiral blade 35 to rotate, and the spiral blade 35 spirals upward to transport the material into the feed inlet 332, so that the material enters the column cylinder 51 from the feed inlet 332. It is worth noting that the inclination angle of the conveying cylinder 33 is between 30° and 60° to reduce the resistance of the material being lifted upward.

[0041] Furthermore, a crushing assembly 4 is installed on the upper bottom side of the feeding assembly 3. The crushing assembly 4 includes a crushing box 41 fixedly connected to the discharge port 331. Two crushing rollers 42 are rotatably connected between the inner walls of the two sides of the crushing box 41. Two third motors 43 are fixedly connected to the outer side of the crushing box 41. The output ends of the two third motors 43 pass through the crushing box 41 and are fixedly connected to the adjacent crushing rollers 42. A feed hopper 44 is fixedly embedded on the upper side of the crushing box 41. The feed hopper 44 is connected to the bottom end of the return pipe 7.

[0042] Specifically, the third motor 43 drives the two crushing rollers 42 to rotate in opposite directions, which can crush the large pieces of material that enter. After being crushed, the material enters the conveying cylinder 33. It is worth noting that the crushing rollers 42 are densely covered with crushing protrusions. During the process of the two crushing rollers 42 rotating in opposite directions, the relative crushing protrusions continuously approach each other, which can squeeze and crush large pieces of material. During this process, some crushing will be missed.

[0043] Furthermore, a screening assembly 5 is installed on the top of the feeding assembly 3. The screening assembly 5 includes a column 51 fixedly sleeved on the outer side of the bottom end of the feed inlet 332. A material gathering hopper 52 is opened in the middle of the column 51. A feed pipe 6 is fixed at the bottom end of the material gathering hopper 52. An arc-shaped mesh 53 is fixedly embedded at the top of the material gathering hopper 52. The top ends of the two return pipes 7 are respectively fixedly embedded on the lower sides of both ends of the column 51. A shaft 54 ​​is rotatably connected between the inner walls of both ends of the column 51. A spoke 55 is fixedly connected to the outer side of the shaft 54. Multiple scrapers 56 are fixedly connected between the spokes 55. Both ends of the shaft 54 ​​are set to pass through the column 51.

[0044] Specifically, the shaft 54 ​​can drive the spoke 55 to rotate, which in turn allows the scraper 56 to continuously scrape up the material inside the column cylinder 51. Under the action of gravity, the material can be lifted and then tumble down. Small pieces of material can pass through the arc-shaped mesh 53 and fall into the concrete mixing equipment through the feed pipe 6, while large pieces of material cannot fall due to the obstruction of the arc-shaped mesh 53. Until the large pieces of material roll to the end of the column cylinder 51, they can roll back into the feed hopper 44 through the return pipe 7 for secondary crushing. This fully ensures the uniformity of the material particles and avoids large pieces of material from affecting the quality of the concrete.

[0045] Furthermore, the screening assembly 5 also includes a first transmission box 57 located above the conveying cylinder 33. Second transmission boxes 58 are fixed to both sides of the first transmission box 57. A first transmission shaft 571 is rotatably connected between the inner walls of both sides of the first transmission box 57. A transmission bevel gear 572 is fixedly sleeved on the outer side of the middle portion of the first transmission shaft 571. The transmission bevel gear 572 is meshed with a driving bevel gear 573. The driving bevel gear 573 is fixedly connected to a central shaft 34 extending into the first transmission box 57. Both ends of the first transmission shaft 571 extend into adjacent second transmission boxes 58, and a first transmission wheel 581 is fixedly sleeved on the portion of the first transmission shaft 571 located within the second transmission box 58. A second transmission wheel 582 is provided below each of the first transmission wheels 581. A transmission belt 583 is drivingly connected between the first transmission wheel 581 and the second transmission wheel 582. The second transmission wheel 582 is fixedly connected to a shaft 54 ​​extending into the second transmission box 58.

[0046] Specifically, the central shaft 34 drives the drive bevel gear 573 to rotate, the drive bevel gear 573 meshes with the transmission bevel gear 572, the transmission bevel gear 572 drives the first transmission shaft 571, the first transmission shaft 571 drives the first transmission wheel 581 to rotate, the first transmission wheel 581 drives the second transmission wheel 582 to rotate through the transmission belt 583, and the second transmission wheel 582 drives the shaft 54 ​​to rotate. This eliminates the need to install a heavy drive device at the top of the feeding device, reducing the load on the equipment and helping to maintain the balance of the equipment.

[0047] Furthermore, the bottom of the screening assembly 5 is equipped with a feed pipe 6 that allows small pieces of material to pass through, and both ends of the screening assembly 5 are equipped with return pipes 7 for conveying large pieces of material. The bottom end of the return pipe 7 extends into the crushing assembly 4. The height of the screening assembly 5 is greater than the height of the crushing assembly 4, so that the inclination angle of the return pipe 7 is between 30° and 45°.

[0048] Specifically, the material can flow effectively from the screening component 5 to the crushing component 4. The appropriate angle can maintain the smooth flow of the material and control the flow speed of the material. It is worth mentioning that the feed pipe 6 and the return pipe 7 can both be used for two purposes: they can be used to transport materials and to absorb dust-laden airflow in the reverse direction, achieving two goals at once.

[0049] Furthermore, dust suppression components 8 are connected to both ends of the screening assembly 5 and the adjacent return pipe 7. The dust suppression component 8 includes a wind duct 81 fixedly connected between the column 51 and the second transmission box 58. A one-way valve 82 is installed in the outlet end of the wind duct 81. The inlet end of the wind duct 81 is fixedly connected to the air outlet of the cyclone dust collector 83. The inlet end of the cyclone dust collector 83 is connected to the return pipe 7. A shaft 54 ​​passes through the middle of the wind duct 81, and multiple fan blades 84 are equidistantly arranged on the outer side of the portion of the shaft 54 ​​located inside the wind duct 81.

[0050] Specifically, the shaft 54 ​​drives the fan blades 84 to rotate continuously, which centrifugally throws air through the one-way valve 82. This allows the air inside the cyclone dust collector 83 to be continuously absorbed, thereby generating centrifugal wind force inside the cyclone dust collector 83. The external airflow continuously enters the cyclone dust collector 83 through the return pipe 7 and the inlet pipe 6, so that the dust carried by the airflow can be centrifugally settled, which can eliminate dust pollution caused by raw material feeding. It is worth noting that this method can simultaneously absorb dust from both the upper and lower ends of the feeding device, thereby minimizing dust pollution.

[0051] Working principle: During use, after pushing the feeding device to the processing position, the first motor 22 drives the vertical shaft 23 to rotate. After chain transmission, multiple sprockets 24 rotate synchronously, so that the worm 25 can drive the worm wheel 26 to rotate. The internal thread structure in the worm wheel 26 can drive the lead screw 27 to move downward, thereby raising the height of the counterweight 1, so that the caster wheel 11 is suspended in the air. This can fully position the counterweight 1 and prevent the feeding device from shifting during operation, adding material into the hopper 44. The third motor 43 drives the two crushing rollers 42 to rotate in opposite directions, which can crush large pieces of material that enter. After being crushed, the material enters the conveying cylinder 33. The second motor 36 drives the central shaft 34 to rotate, which in turn drives the spiral blade 35 to rotate. The spiral blade 35 spirals upward, conveying the material into the feed inlet 332, allowing the material to enter the column cylinder 51. Simultaneously, the central shaft 34 drives the drive bevel gear 573 to rotate, which in turn meshes with the transmission bevel gear 572. The transmission bevel gear 572 drives the first transmission shaft 571, which in turn drives the first transmission wheel 581 to rotate. The first transmission wheel 581 is driven by the transmission belt 583. The second drive wheel 582 rotates, which in turn drives the shaft 54 ​​to rotate. The shaft 54 ​​then drives the spoke 55 to rotate, thereby causing the scraper 56 to continuously scrape up the material inside the column cylinder 51. Under the action of gravity, the material is lifted and then tumbles down. Small pieces of material can pass through the arc-shaped mesh 53 and fall into the concrete mixing equipment through the feed pipe 6, while large pieces of material cannot fall due to the obstruction of the arc-shaped mesh 53. Until the large pieces of material roll to the end of the column cylinder 51, they can roll back into the feed hopper 44 through the return pipe 7 for secondary crushing, thus ensuring the uniformity of material particles. Uniformity is ensured to prevent large pieces of material from affecting the quality of concrete. At the same time, the shaft 54 ​​drives the fan blades 84 to rotate continuously, which can centrifugally throw out air through the one-way valve 82. This allows the air in the cyclone dust collector 83 to be continuously absorbed, thereby generating centrifugal wind in the cyclone dust collector 83. The external airflow continuously enters the cyclone dust collector 83 through the return pipe 7 and the inlet pipe 6, so that the dust carried by the airflow can be centrifugally settled, which can eliminate the dust pollution caused by the feeding of raw materials. After the equipment has been running for a period of time, waste materials can be collected simply by opening the material outlet of the cyclone dust collector 83.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A raw material feeding device for a construction site, comprising a counterweight seat (1), characterized in that, The counterweight seat (1) lower side middle part is provided with multiple universal wheels (11), the counterweight seat (1) edge is provided with lifting assembly (2), the counterweight seat (1) upper side is provided with the oblique setting material lifting assembly (3), the material lifting assembly (3) bottom upper side is provided with the broken material assembly (4), the material lifting assembly (3) top is provided with the screening assembly (5), the screening assembly (5) bottom is provided with the inlet pipe (6) that allows small block material to pass, the screening assembly (5) both ends are provided with the return pipe (7) for transmitting large block material, the return pipe (7) bottom end extends into the broken material assembly (4), and the screening assembly (5) both ends and adjacent return pipe (7) between are connected with dust fall assembly (8); The screening assembly (5) includes the cylinder (51) fixedly sleeved at the bottom end outside of the inlet (332), the middle part of the cylinder (51) is provided with a material collecting hopper (52), the bottom end of the material collecting hopper (52) is fixed with the inlet pipe (6), and the top of the material collecting hopper (52) is fixedly embedded with an arc-shaped net (53), the top ends of the two return pipes (7) are respectively fixedly embedded on the lower sides of the two ends of the cylinder (51), the inner walls of the two ends of the cylinder (51) are rotatably connected with shaft rods (54), the outer sides of the shaft rods (54) are fixedly connected with spoke discs (55), a plurality of scraper plates (56) are fixedly connected between the spoke discs (55), and the two ends of the shaft rods (54) are arranged to extend out of the cylinder (51); The screening assembly (5) further includes a first transmission box (57) above the material conveying cylinder (33), the two sides of the first transmission box (57) are fixedly provided with second transmission boxes (58), wherein the first transmission shaft (571) is rotatably connected between the inner walls of the two sides of the first transmission box (57), the transmission bevel gear (572) is fixedly sleeved on the middle part of the outer side of the first transmission shaft (571), the driving bevel gear (573) is connected in meshing with the transmission bevel gear (572), the driving bevel gear (573) is fixedly connected with the central shaft (34) extending into the first transmission box (57), the two ends of the first transmission shaft (571) extend into the adjacent second transmission boxes (58) respectively, and the portions of the first transmission shaft (571) in the second transmission boxes (58) are fixedly sleeved with first transmission wheels (581), the second transmission wheels (582) are arranged below the first transmission wheels (581), the first transmission wheels (581) and the second transmission wheels (582) are transmissionally connected with transmission belts (583), and the second transmission wheels (582) are fixedly connected with the shaft rods (54) extending into the second transmission boxes (58). The dust falling assembly (8) comprises a wind cylinder (81) fixedly connected between the cylinder (51) and the second transmission box (58), a one-way valve (82) is mounted in the outlet end of the wind cylinder (81), the inlet end of the wind cylinder (81) is fixedly connected with the air outlet of a cyclone dust collector (83), the inlet end of the cyclone dust collector (83) is communicated with the material returning pipe (7), and the middle part of the wind cylinder (81) penetrates through the shaft rod (54), and the outer side of the part of the shaft rod (54) located in the wind cylinder (81) is equidistantly provided with a plurality of fan blades (84). The lifting assembly (2) comprises a ring-shaped empty box (21) fixed on the upper side of the counterweight seat (1) and a first motor (22) fixed on the upper side of the ring-shaped empty box (21), a plurality of vertical shafts (23) are rotatably connected between the upper and lower inner walls of the ring-shaped empty box (21), the output end of the first motor (22) is fixedly connected with one of the vertical shafts (23), a sprocket (24) and a worm (25) are fixedly sleeved on the outer side of the vertical shaft (23), a plurality of the sprockets (24) are drivingly connected through a transmission chain, the worms (25) are all drivingly connected with worm gears (26), the worm gears (26) are all rotatably connected with the bottom wall of the ring-shaped empty box (21), the middle part of the worm gear (26) is provided with an internal thread, the internal thread is adaptively connected with a lead screw (27), the bottom end of the lead screw (27) extends out of the ring-shaped empty box (21) and is fixedly connected with the same annular plate (28), and the bottom end of the lead screw (27) extends out of the counterweight seat (1) and is fixedly connected with a column foot (29).

2. A raw material feeding device for a construction site according to claim 1, wherein The height of the screening assembly (5) is greater than that of the crushing assembly (4), so that the inclination angle of the material returning pipe (7) ranges from 30° to 45°.

3. A raw material feeding device for a construction site according to claim 1, wherein The lifting assembly (2) comprises a ring-shaped empty box (21) fixed on the upper side of the counterweight seat (1) and a first motor (22) fixed on the upper side of the ring-shaped empty box (21), a plurality of vertical shafts (23) are rotatably connected between the upper and lower inner walls of the ring-shaped empty box (21), the output end of the first motor (22) is fixedly connected with one of the vertical shafts (23), a sprocket (24) and a worm (25) are fixedly sleeved on the outer side of the vertical shaft (23), a plurality of the sprockets (24) are drivingly connected through a transmission chain, the worms (25) are all drivingly connected with worm gears (26), the worm gears (26) are all rotatably connected with the bottom wall of the ring-shaped empty box (21), the middle part of the worm gear (26) is provided with an internal thread, the internal thread is adaptively connected with a lead screw (27), the bottom end of the lead screw (27) extends out of the ring-shaped empty box (21) and is fixedly connected with the same annular plate (28), and the bottom end of the lead screw (27) extends out of the counterweight seat (1) and is fixedly connected with a column foot (29).

4. A raw material feeding device for a construction site according to claim 3, characterized in that: The crushing assembly (4) comprises a crushing box (41) fixedly connected with the discharge port (331), two crushing rollers (42) are rotatably connected between the inner walls of the two sides of the crushing box (41), two third motors (43) are fixedly connected with the outer side of the crushing box (41), the output ends of the two third motors (43) are fixedly connected with the adjacent crushing rollers (42) penetrating through the crushing box (41), and a feeding hopper (44) is fixedly embedded on the upper side of the crushing box (41), and the feeding hopper (44) is communicated with the bottom end of the material returning pipe (7).

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