Raw material feeding device for construction site

Abstract

The raw material feeding device for the construction site comprises a balance weight seat, a plurality of universal wheels are installed in the middle of the lower side of the balance weight seat, a lifting assembly is installed at the edge of the balance weight seat, a material lifting assembly which is obliquely arranged is installed on the upper side of the balance weight seat, and a material crushing assembly is installed on the upper side of the bottom of the material lifting assembly. Materials are added into a feeding hopper, a third motor drives two crushing rollers to rotate oppositely, the entered large materials can be crushed, the crushed materials enter a conveying barrel, a second motor drives a center shaft to rotate, the center shaft drives a spiral blade to rotate, the spiral blade spirally upwards conveys the materials into a feeding port, and the materials enter a column barrel from the feeding port; and synchronously, the central shaft drives the driving bevel gear to rotate, the driving bevel gear is in meshing transmission with the transmission bevel gear, the transmission bevel gear drives the shaft rod to rotate through the belt wheel transmission mechanism, the shaft rod can drive the spoke disc to rotate, and then the scraping plate can continuously scrape materials in the column casing.

Description

Technical Field

[0001] The invention relates to the technical field of building construction equipment, in particular to a raw material feeding device used in a construction site. Background Art

[0002] Ordinary concrete refers to an artificial stone made of cement as the main cementitious material, water, sand, gravel, chemical admixtures and mineral admixtures when necessary, mixed in appropriate proportions, and uniformly mixed, compacted and hardened. Concrete is mainly divided into two stages and states: the plastic state before coagulation and hardening, that is, fresh concrete or concrete mixture, and the hard state after hardening, that is, hardened concrete or concrete. The strength grade of concrete is divided according to the standard value of cubic compressive strength. The strength grade of ordinary concrete in China 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 on the particle size of aggregate. Therefore, in general, it is necessary to crush and screen the aggregate before feeding to ensure the quality of concrete.

[0003] Chinese patent announcement number CN116689130B discloses a feeding device for crushing building materials, which relates to the field of feeding machines, including a discharge port at the upper end of the conveying pipe, a through pipe fixedly connected to the lower end of the conveying pipe, and a main box body fixedly connected to one end of the conveying pipe away from the discharge port, and the through pipe is fixedly connected to the side wall of the main box body. The feeding device for crushing building materials is provided with a buffer device. When the building materials enter the main box body, the second motor drives the buffer plate to rotate, and the building materials slow down the falling speed as the buffer plate rotates, reducing the impact force of the building materials on the main box body. At the same time, the water inlet is connected to the water source, and the water enters the water trough through the water trough, and then sprays out from the nozzle through the water trough to spray the fallen building materials to reduce dust. The sieve plate and the lifting mechanism can realize the screening and conveying of the building materials, thereby improving the crushing efficiency. In combination with the control moving device and the lifting device, the feeding device can be made to work with different crushers;

[0004] The above technology realizes the conveying and feeding of smaller materials by repeatedly pressing down and screening the materials. The screening efficiency is low, it is easy to be blocked, the dust reduction effect is poor, and the water resource loss is large. Therefore, the present invention discloses a raw material feeding device for use in 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 resource loss in traditional feeding equipment for crushing building materials, and to provide a raw material feeding device for construction sites to solve the above problems.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a raw material feeding device for a construction site, comprising a counterweight seat, a plurality of universal wheels are installed in the middle of the lower side of the counterweight seat, a lifting assembly is installed at the edge of the counterweight seat, an inclined lifting assembly is installed on the upper side of the counterweight seat, a crushing assembly is installed on the upper side of the bottom of the lifting assembly, a screening assembly is installed on the top of the lifting assembly, a feeding pipe for allowing small pieces of material to pass through is installed at the bottom of the screening assembly, return pipes for transmitting large pieces of material are installed at both ends of the screening assembly, the bottom end of the return pipe extends into the crushing assembly, and dust reduction assemblies are connected between both ends of the screening assembly and adjacent return pipes.

[0007] Furthermore, the height of the screening assembly is greater than the height of the crushing assembly, so that the inclination angle of the return pipe ranges from 30° to 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 seat, a second motor is screwed on the first support plate, an inclined feed cylinder is fixedly connected to the top end of the second support plate, a central axis is rotatably connected between the inner walls at both ends of the feed cylinder, a spiral blade is fixedly connected to the outer side of the central axis, the bottom end of the central axis passes through the feed 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 feed cylinder, and an inlet is fixedly embedded on the upper side of the bottom end of the feed cylinder.

[0009] Furthermore, the screening assembly includes a column fixedly mounted on the outer side of the bottom end of the feed port, a collecting hopper is opened in the middle of the column, a feed pipe is fixed to the bottom end of the collecting hopper, and an arc-shaped net is fixedly embedded on the top of the collecting hopper, the top ends of the two return pipes are respectively fixedly embedded in the lower sides of the two ends of the column, an axle rod is rotatably connected between the inner walls of the two ends of the column, a spoke disk is fixedly connected to the outer side of the axle rod, a plurality of scrapers are fixedly connected between the spoke disks, and both ends of the axle rod are arranged to pass through the column.

[0010] Furthermore, the screening assembly also includes a first transmission box located above the feeding cylinder, and a second transmission box is fixed on both sides of the first transmission box, wherein a first transmission shaft is rotatably connected between the inner walls of both sides of the first transmission box, a transmission bevel gear is fixedly sleeved on the outer middle part of the first transmission shaft, and the transmission bevel gear is meshingly connected with a driving bevel gear, and the driving bevel gear is fixedly connected to a central shaft extending into the first transmission box, and both ends of the first transmission shaft extend into the adjacent second transmission box respectively, and the part of the first transmission shaft located in the second transmission box is fixedly sleeved with a first transmission wheel, and a second transmission wheel is arranged under the first transmission wheel, a transmission belt is transmission-connected between the first transmission wheel and the second transmission wheel, and the second transmission wheel is fixedly connected to a shaft rod extending into the second transmission box.

[0011] Furthermore, the dust reduction assembly includes an air duct fixedly connected between the column and the second transmission box, a one-way valve is installed in the outlet end of the air duct, the inlet end of the air duct is fixedly connected to the air outlet of the cyclone dust collector, the inlet end of the cyclone dust collector is connected to the return pipe, an axial rod passes through the middle of the air duct, and a plurality of fan blades are equidistantly arranged on the outside of the part of the axial rod located in the air duct.

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

[0013] Furthermore, the lifting assembly includes an annular empty box fixed on the upper side of the counterweight seat and a first motor fixed on the upper side of the annular empty box. A plurality of 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 provided on the fixed sleeve outside the vertical shaft. The plurality of sprockets are connected by a transmission chain. The worms are all connected by a worm wheel. The worm wheels are rotatably connected to the bottom wall of the annular empty box. An internal thread is provided in the middle of the worm wheel. The internal thread is adapted to be connected 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 the lead screw extends out of the counterweight seat and is fixed to a column foot.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention relates to a raw material feeding device for a construction site. The material is added into a hopper, and the third motor drives the two crushing rollers to rotate in opposite directions, so as to crush the large pieces of material that are entered. After the materials are crushed, they enter the feeding tube, and the second motor drives the central shaft to rotate, and the central shaft drives the spiral blades to rotate. The spiral blades spirally transmit the materials upward into the feeding port, so that the materials enter the column barrel from the feeding port. Synchronously, the central shaft drives the driving bevel gear to rotate, and the driving bevel gear meshes with the transmission bevel gear. The transmission bevel gear drives the shaft rod to rotate through the pulley transmission mechanism, and the shaft rod can drive the spoke disk to rotate, so that the scraper can continuously scrape the materials in the column barrel. Under the action of gravity, the materials can be lifted and then tumbled down. Small pieces of materials can pass through the arc net and fall into the concrete mixing equipment through the feeding pipe, while large pieces of materials cannot fall down due to the obstruction of the arc net, until the large pieces of materials roll to the end of the column barrel, and can roll back into the feeding hopper through the return pipe, so as to perform secondary crushing operation, which fully guarantees the uniformity of material particles and prevents large pieces of materials from affecting the quality of concrete.

[0016] 2. The present invention discloses a raw material feeding device for a construction site. The shaft drives the fan blades to rotate continuously, and the air can be centrifugally thrown out through a one-way valve, so that the air in the cyclone dust collector can be continuously absorbed, and then centrifugal wind force can be generated in the cyclone dust collector. The external airflow is continuously replenished into the cyclone dust collector through the return pipe and the feed pipe, so that the dust entrained by the airflow can be centrifugally dusted, and the dust pollution caused by the raw material feeding can be eliminated. After the equipment has been running for a period of time, it is only necessary to open the material outlet of the cyclone dust collector to collect waste materials;

[0017] 3. The present invention provides a raw material feeding device for use at a construction site. After the feeding device is pushed to a processing position, a first motor drives a vertical shaft to rotate. After chain transmission, a plurality of sprockets rotate synchronously, so that the worm can drive a worm wheel to rotate. The internal thread structure in the worm wheel can threadably drive a lead screw to move downward, thereby raising the height of a counterweight seat and making the universal wheel suspended in the air. This can fully position the counterweight seat and prevent the feeding device from shifting during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side cross-sectional view of a raw material feeding device for a construction site according to the present invention;

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

[0020] Figure 3 The invention is a raw material feeding device for a construction site. Figure 1 A magnified view of the structure at A;

[0021] Figure 4 The invention is a raw material feeding device for a construction site. Figure 1 A magnified view of the structure at B in FIG.

[0022] Figure 5 The invention is a raw material feeding device for a construction site. Figure 2 A magnified view of the structure at C in FIG.

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

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

[0025] Figure 8 This is a structural disassembly diagram of a second transmission box in a raw material feeding device used at a construction site according to the present invention.

[0026] The reference numerals are as follows:

[0027] 1. Counterweight seat; 2. Lifting assembly; 3. Material lifting assembly; 4. Material crushing assembly; 5. Material screening assembly; 6. Material inlet pipe; 7. Material return pipe; 8. Dust suppression assembly;

[0028] 11. Universal wheel;

[0029] 21. annular empty box; 22. first motor; 23. vertical shaft; 24. sprocket; 25. worm; 26. worm wheel; 27. lead screw; 28. annular plate; 29. ​​column foot;

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

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

[0032] 51. Column; 52. Aggregation hopper; 53. Curved net; 54. Axle; 55. Spoke disc; 56. Scraper; 57. First transmission box; 58. Second transmission box; 571. First transmission shaft; 572. Transmission bevel gear; 573. Driving 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 DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1: Figures 1 to 8 As shown, this embodiment discloses a raw material feeding device for a construction site, comprising a counterweight seat 1, wherein a plurality of universal wheels 11 are installed at the middle part of the lower side of the counterweight seat 1;

[0036] Specifically, the universal wheel 11 can facilitate the displacement of the raw material feeding device.

[0037] Furthermore, a lifting assembly 2 is installed at the edge of the counterweight seat 1, and the lifting assembly 2 includes an annular 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 annular empty box 21. A plurality of vertical shafts 23 are rotatably connected between the upper and lower inner walls of the annular empty box 21, and the output end of the first motor 22 is fixedly connected to 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. The plurality of sprockets 24 are connected by a transmission chain. The worm 25 is connected by a worm wheel 26. The worm wheel 26 is rotatably connected to the bottom wall of the annular empty box 21. An internal thread is provided in the middle of the worm wheel 26, and a screw rod 27 is adapted to be connected to the internal thread. The bottom end of the screw rod 27 extends out of the annular empty box 21 and is fixedly connected to the same annular plate 28. The bottom end of the screw rod 27 extends out of the counterweight seat 1 and is fixed with a column foot 29.

[0038] Specifically, the first motor 22 drives the vertical shaft 23 to rotate, and after chain transmission, multiple sprockets 24 rotate synchronously, so that the worm 25 can drive the worm wheel 26 to rotate, and the internal thread structure in the worm wheel 26 can threadably drive the screw 27 to move downward, thereby raising the height of the counterweight seat 1, so that the universal wheel 11 is suspended in the air, which can fully locate the position of the counterweight seat 1 and prevent the loading device from shifting during operation.

[0039] Furthermore, an inclined material lifting assembly 3 is installed on the upper side of the counterweight seat 1, and 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 seat 1, a second motor 36 is screwed on the first support plate 31, and a tilted material feeding 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 at both ends of the material feeding 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 feeding cylinder 33 and the first support plate 31 and is fixedly connected to the output shaft of the second motor 36, and a discharge port 331 is opened on the lower side of the top end of the material feeding cylinder 33, and a material inlet 332 is fixedly embedded on the upper side of the bottom end of the material feeding cylinder 33;

[0040] Specifically, the second motor 36 drives the central shaft 34 to rotate, and the central shaft 34 drives the spiral blades 35 to rotate. The spiral blades 35 spirally transmit the material upward into the feed port 332, so that the material enters the column 51 from the feed port 332. It is worth noting that the inclination angle of the feed barrel 33 is between 30° and 60° to reduce the resistance to the upward lifting of the material.

[0041] Further, a crushing assembly 4 is installed on the upper side of the bottom of the lifting assembly 3, and the crushing assembly 4 includes a crushing box 41 fixedly connected to the discharge port 331, and two crushing rollers 42 are rotatably connected between the inner walls of both sides of the crushing box 41, and 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, and a feed hopper 44 is fixedly embedded on the upper side of the crushing box 41, and 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 towards each other, which can crush the large pieces of material that enter. After the materials are crushed, they enter the feeding barrel 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 towards each other, the relative crushing protrusions are constantly approaching, which can squeeze and crush large pieces of material. In this process, certain crushing omissions will occur.

[0043] Furthermore, a screening component 5 is installed on the top of the material lifting component 3, and the screening component 5 includes a column 51 fixedly sleeved on the outer side of the bottom end of the feed inlet 332, a collecting hopper 52 is opened in the middle of the column 51, a feed pipe 6 is fixed to the bottom end of the collecting hopper 52, and an arc-shaped net 53 is fixedly embedded on the top of the collecting hopper 52, and the top ends of the two return pipes 7 are respectively fixedly embedded on the lower sides of the two ends of the column 51, and a shaft 54 ​​is rotatably connected between the inner walls of the two ends of the column 51, and a spoke 55 is fixedly connected to the outer side of the shaft 54, and a plurality of scrapers 56 are fixedly connected between the spokes 55, and both ends of the shaft 54 ​​are arranged outside the column 51;

[0044] Specifically, the shaft 54 ​​can drive the spoke 55 to rotate, so that the scraper 56 can continuously scrape up the material in the column 51. Under the action of gravity, the material can be lifted and then tumbled down. Small pieces of material can pass through the arc net 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 net 53 until the large pieces of material roll to the end of the column 51. They can then roll back into the feed hopper 44 through the return pipe 7 and perform secondary crushing operations, which fully ensures the uniformity of material particles and prevents large pieces of material from affecting the quality of concrete.

[0045] Further, the screening material assembly 5 also includes a first transmission box 57 located above the feeding cylinder 33, and second transmission boxes 58 are fixed on both sides of the first transmission box 57, wherein 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 part of the first transmission shaft 571, and the transmission bevel gear 572 is meshingly connected with a driving bevel gear 573, and the driving bevel gear 573 is fixedly connected to the central shaft 34 extending into the first transmission box 57, and the two ends of the first transmission shaft 571 extend into the adjacent second transmission box 58, and the part of the first transmission shaft 571 located in the second transmission box 58 is fixedly sleeved with a first transmission wheel 581, and a second transmission wheel 582 is arranged below the first transmission wheel 581, a transmission belt 583 is transmission-connected between the first transmission wheel 581 and the second transmission wheel 582, and the second transmission wheel 582 is fixedly connected to the shaft rod 54 extending into the second transmission box 58;

[0046] Specifically, the center shaft 34 drives the driving bevel gear 573 to rotate, the driving bevel gear 573 engages 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. There is no need to install a heavy driving device on the top of the feeding device, which reduces the equipment load and helps to maintain the balance of the equipment.

[0047] Furthermore, a feed pipe 6 for allowing small pieces of material to pass through is installed at the bottom of the screening component 5, and return pipes 7 for transmitting large pieces of material are installed at both ends of the screening component 5. The bottom end of the return pipe 7 extends into the crushing component 4. The height of the screening component 5 is greater than the height of the crushing component 4, so that the inclination angle of the return pipe 7 ranges from 30° to 45°.

[0048] Specifically, the material can effectively flow 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 rate of the material. It is worth noting that the feed pipe 6 and the return pipe 7 can both serve dual purposes, that is, they can be used to transmit materials and reversely absorb the dust-containing airflow, killing two birds with one stone.

[0049] Further, a dust reduction assembly 8 is connected between both ends of the screening assembly 5 and the adjacent return pipe 7, and the dust reduction assembly 8 includes a wind tube 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 tube 81, the inlet end of the wind tube 81 is fixedly connected to the air outlet of the cyclone dust collector 83, and the inlet end of the cyclone dust collector 83 is connected to the return pipe 7, and a shaft 54 ​​runs through the middle of the wind tube 81, and a plurality of fan blades 84 are equidistantly arranged on the outer side of the part of the shaft 54 ​​located in the wind tube 81;

[0050] Specifically, the shaft 54 ​​drives the fan blades 84 to rotate continuously, and the air can be centrifugally thrown out through the one-way valve 82, so that the air in the cyclone dust collector 83 can be continuously absorbed, and then centrifugal wind force can be generated in the cyclone dust collector 83, and the external airflow is continuously replenished into the cyclone dust collector 83 through the return pipe 7 and the feed pipe 6, so that the dust entrained by the airflow can be centrifugally reduced, and the dust pollution caused by the feeding of raw materials can be eliminated. It is worth mentioning that this method can absorb the dust at the upper and lower ends of the feeding device at the same time, thereby avoiding dust pollution to the greatest extent.

[0051] Working principle: When in 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 threadably drive the screw 27 to move downward, thereby raising the height of the counterweight seat 1, so that the universal wheel 11 is suspended in the air, which can fully locate the position of the counterweight seat 1 and prevent the feeding device from shifting during operation. The material is added into the hopper 44, and 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 the material is crushed, it enters the feeding barrel 33, the second motor 36 drives the central shaft 34 to rotate, the central shaft 34 drives the spiral blade 35 to rotate, the spiral blade 35 spirally transmits the material upward to enter the feeding port 332, so that the material enters the column 51 from the feeding port 332, synchronously, the central shaft 34 drives the driving bevel gear 573 to rotate, the driving 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, and the first transmission wheel 581 is driven by the transmission belt 583 The second transmission wheel 582 is driven to rotate, and the second transmission wheel 582 drives the shaft 54 ​​to rotate, and the shaft 54 ​​can drive the spoke 55 to rotate, so that the scraper 56 can continuously scrape the material in the column 51. Under the action of gravity, the material can be lifted and then roll down. Small pieces of material can pass through the arc net 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 net 53 until the large pieces of material roll to the end of the column 51, and can roll back into the feed hopper 44 through the return pipe 7, so as to perform secondary crushing operation, which fully ensures the uniformity of material particles. Uniformity can be achieved 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, and the air can be centrifugally thrown out through the one-way valve 82, which allows the air in the cyclone dust collector 83 to be continuously absorbed, thereby generating centrifugal wind force in the cyclone dust collector 83, and the external airflow is continuously replenished into the cyclone dust collector 83 through the return pipe 7 and the feed pipe 6, so that the dust entrained by the airflow can be centrifugally reduced, which can eliminate the dust pollution caused by the feeding of raw materials. After the equipment has been running for a period of time, it is only necessary to open the material outlet of the cyclone dust collector 83 to collect the waste.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention 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: A plurality of universal wheels (11) are installed in the middle of the lower side of the counterweight seat (1); a lifting assembly (2) is installed at the edge of the counterweight seat (1); an inclined lifting assembly (3) is installed on the upper side of the counterweight seat (1); a crushing assembly (4) is installed on the upper side of the bottom of the lifting assembly (3); a screening assembly (5) is installed on the top of the lifting assembly (3); a feeding pipe (6) for allowing small pieces of material to pass through is installed at the bottom of the screening assembly (5); return pipes (7) for transmitting large pieces of material are installed at both ends of the screening assembly (5); the bottom end of the return pipe (7) extends into the crushing assembly (4), and dust reduction assemblies (8) are connected between both ends of the screening assembly (5) and the adjacent return pipes (7).

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

3. A raw material feeding device for a construction site according to claim 1, characterized in that: The material lifting assembly (3) comprises a first support plate (31) and a second support plate (32) fixed on the upper side of the counterweight seat (1); a second motor (36) is screwed on the first support plate (31); a top end of the second support plate (32) is fixedly connected to a tilted feed cylinder (33); a central shaft (34) is rotatably connected between the inner walls at both ends of the feed 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 feed 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 provided on the lower side of the top end of the feed cylinder (33); and a feed inlet (332) is fixedly embedded on the upper side of the bottom end of the feed cylinder (33).

4. A raw material feeding device for a construction site according to claim 3, characterized in that: The screening assembly (5) comprises a column (51) fixedly sleeved on the outer side of the bottom end of the feed inlet (332), a collecting hopper (52) is provided in the middle of the column (51), a feed pipe (6) is fixedly provided at the bottom end of the collecting hopper (52), and an arc-shaped net (53) is fixedly embedded on the top of the collecting hopper (52), the top ends of the two return pipes (7) are respectively fixedly embedded on the lower sides of the two ends of the column (51), an axle rod (54) is rotatably connected between the inner walls at the two ends of the column (51), a spoke disk (55) is fixedly connected to the outer side of the axle rod (54), and a plurality of scrapers (56) are fixedly connected between the spoke disks (55), and both ends of the axle rod (54) are arranged to pass through the column (51).

5. The raw material feeding device for a construction site according to claim 1, characterized in that: The screening material assembly (5) further comprises a first transmission box (57) located above the material delivery cylinder (33), and second transmission boxes (58) are fixed on both sides of the first transmission box (57), wherein a first transmission shaft (571) is rotatably connected between the inner walls of the two sides of the first transmission box (57), and a transmission bevel gear (572) is fixedly sleeved on the outer side of the middle part of the first transmission shaft (571), and the transmission bevel gear (572) is meshingly connected with a driving bevel gear (573), and the driving bevel gear (573) is connected to the central shaft (33) extending into the first transmission box (57). 4) fixedly connected, the two ends of the first transmission shaft (571) respectively extend into the adjacent second transmission box (58), and the portion of the first transmission shaft (571) located in the second transmission box (58) is fixedly sleeved with a first transmission wheel (581), a second transmission wheel (582) is arranged below the first transmission wheel (581), a transmission belt (583) is connected between the first transmission wheel (581) and the second transmission wheel (582), and the second transmission wheel (582) is fixedly connected to a shaft rod (54) extending into the second transmission box (58).

6. The raw material feeding device for a construction site according to claim 1, characterized in that: The dust reduction assembly (8) comprises a wind tube (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 tube (81); the inlet end of the wind tube (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 tube (81); and a plurality of fan blades (84) are equidistantly arranged on the outer side of the part of the shaft (54) located in the wind tube (81).

7. The 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 to the discharge port (331), two crushing rollers (42) are rotatably connected between the inner walls on both 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 adjacent crushing rollers (42), and a feed hopper (44) is fixedly embedded on the upper side of the crushing box (41), and the feed hopper (44) is connected to the bottom end of the return pipe (7).

8. The raw material feeding device for a construction site according to claim 1, characterized in that: The lifting assembly (2) comprises an annular 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 annular empty box (21); a plurality of vertical shafts (23) are rotatably connected between the upper and lower inner walls of the annular empty box (21); an output end of the first motor (22) is fixedly connected to 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); and a plurality of sprockets (24) are connected between the plurality of sprockets (24). The worm (25) is connected to a worm wheel (26) through a transmission chain, and the worm wheel (26) is connected to the bottom wall of the annular empty box (21) for rotation. An internal thread is provided in the middle of the worm wheel (26), and the internal thread is adapted to be connected to a screw rod (27). The bottom end of the screw rod (27) extends out of the annular empty box (21) and is fixedly connected to the same annular plate (28). The bottom end of the screw rod (27) extends out of the counterweight seat (1) and is fixed with a column foot (29).

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