Material controlling and screening device for building gravel

Abstract

The invention provides a material controlling and screening device for building gravel. The material controlling and screening device comprises a support, a screening mechanism and a material controlling mechanism. Materials fall into the screening box through the discharging channel to be screened, along with screening, the weight of the to-be-screened materials accumulated in the screening box is gradually increased, the screening box moves downwards, first springs are pressed to be shrunk, the screening box moves downwards, an opening in the bottom end of the discharging channel is reduced through the adjusting mechanism, and therefore the feeding amount is automatically reduced; when materials in the screening box are reduced due to screening, the weight of the screening box is reduced, under the action of resilience force of the first spring, the screening box moves upwards, an opening in the bottom end of the discharging channel is enlarged through the adjusting mechanism, and therefore the feeding amount is automatically increased, and the feeding speed is automatically adjusted according to the real-time weight of the materials in the screening box; the problems of screening box blockage, screening efficiency reduction, overlarge equipment load and the like caused by excessive one-time feeding are avoided, and efficient, continuous and stable operation of the screening process is ensured.

Description

Technical Field

[0001] This invention relates to the field of building material screening technology, and specifically to a controlled screening device for building sand and gravel. Background Technology

[0002] Construction aggregates are commonly used basic materials in construction projects, and the uniformity of their particle size distribution directly affects concrete strength, construction quality, and material utilization. During the production and use of aggregates, it is often necessary to screen aggregates of different particle sizes to meet the gradation requirements of different parts of the project.

[0003] Traditional sand and gravel screening equipment often lacks automatic control mechanisms during the feeding process, relying solely on manual adjustment of the feeding rhythm based on experience. This easily leads to overfeeding, causing a series of problems. Excess sand and gravel quickly accumulate on the screen, exceeding its load-bearing and screening limits. Fine particles rapidly embed themselves in the screen openings and are compacted and agglomerated by the high-frequency vibration of the vibrating motor, resulting in frequent screen blockages. This not only drastically reduces the effective screening area and deteriorates the screening effect but also requires manual cleaning, interrupting the production process. The violent impact during cleaning can also damage the screen and shorten its lifespan. Furthermore, overfeeding directly causes a decrease in screening efficiency and a surge in equipment load, creating a chain reaction that affects overall production stability. Therefore, to address these technical problems, a controlled-feed screening device for construction sand and gravel is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a material control screening device for construction sand and gravel, which facilitates automatic adjustment of the feeding speed based on the real-time weight of the material in the screening box, avoiding problems such as screening box blockage, decreased screening efficiency, and excessive equipment load caused by excessive feeding at one time.

[0005] A material control and screening device for construction sand and gravel, comprising: support; A screening mechanism includes a screening box and a first spring; the screening box is vertically slidable on the support, and the first spring connects the support and the screening box, providing an upward elastic support force to the screening box; and The material control mechanism includes a feeding chamber and an adjustment mechanism. The feeding chamber is mounted on the support and has a vertically opening at its top that connects to the top of the screening box. The adjustment mechanism is located at the bottom of the feeding chamber and is connected to the screening box in a transmission manner. It is used to reduce or increase the opening at the bottom of the material discharge channel when the screening box moves downward or upward.

[0006] In one embodiment, the material control mechanism further includes a material passage hopper; the material passage hopper is disposed on the support and located between the screening box and the feeding chamber, and the material passage hopper has a guide channel connecting the bottom end of the discharge channel and the top end of the screening box, the guide channel being tapered with its larger end facing the feeding chamber, and the adjustment mechanism connecting the bottom end of the feeding chamber and the top end of the material passage hopper.

[0007] In one embodiment, the adjusting mechanism includes a first distributing plate, a second distributing plate, and a transmission mechanism; the first distributing plate is fixed at the top of the material guiding channel, and the second distributing plate is rotatably disposed at the bottom of the material dropping channel corresponding to the first distributing plate; both the first and second distributing plates have arrayed perforated material openings; the transmission mechanism connects the screening box and the second distributing plate, and is used to drive the second distributing plate to rotate when the screening box moves downward or upward, so as to reduce or increase the overlap of the perforated material openings in the first and second distributing plates.

[0008] In one embodiment, the transmission mechanism includes a bevel gear ring, a bevel gear, and a transmission assembly; the bevel gear ring is coaxially disposed on the periphery of the second distribution disc, the bevel gear is rotatably disposed on the feed chamber and meshes with the bevel gear ring, and the transmission assembly connects the bevel gear and the screening box to convert the sliding of the screening box into the rotation of the bevel gear.

[0009] In one embodiment, a fixed annular groove is provided at the bottom of the feeding chamber, and an annular sliding ring coaxial with the material discharge channel is rotatably disposed in the fixed annular groove. The second material distribution plate is coaxially disposed inside the annular sliding ring, and the conical tooth ring is coaxially disposed outside the annular sliding ring.

[0010] In one embodiment, the transmission assembly includes a rack and a gear; the rack is vertically slidably disposed on the bracket and connected to the screening box, and the gear is coaxially disposed on the bevel gear and meshes with the rack.

[0011] In one embodiment, the screening mechanism further includes a base frame and a vibration assembly; the base frame is vertically slidable on the support and is drive-connected to the adjustment mechanism; the first spring connects the support and the base frame to provide an upward elastic support force to the base frame; the screening box is horizontally slidable within the base frame; the vibration assembly is disposed on the screening box and connected to the base frame to drive the screening box to reciprocate.

[0012] In one embodiment, limit blocks are provided at both ends of the screening box, and limit grooves are provided at both ends of the inner side of the bottom frame. The two sets of limit blocks are horizontally slidably arranged in the two sets of limit grooves.

[0013] In one embodiment, the vibration assembly includes a second spring, a motor, and an eccentric roller; the second spring is connected to the inner side of the bottom frame on one side of the screening box, the motor is fixed on the other side of the screening box, and the eccentric roller is fixed at the output end of the motor.

[0014] In one embodiment, a sieve plate is detachably provided at the bottom of the screening box, and a receiving box is provided directly below the sieve plate.

[0015] The aforementioned material control and screening device for building sand and gravel has at least the following beneficial effects: 1. Material falls into the screening box through the material discharge channel for screening. As screening proceeds, the weight of the material to be screened gradually increases, causing the screening box to move downwards and compressing the first spring. The downward movement of the screening box reduces the opening at the bottom of the material discharge channel through the adjustment mechanism, thereby automatically reducing the feeding amount. Conversely, when the material in the screening box decreases due to screening, the weight of the screening box lightens. Under the rebound force of the first spring, the screening box moves upwards, increasing the opening at the bottom of the material discharge channel through the adjustment mechanism, thereby automatically increasing the feeding amount. This allows for automatic adjustment of the feeding speed based on the real-time weight of the material in the screening box, achieving intelligent material control by feeding slowly when there is too much material and quickly when there is too little material. This avoids problems such as screening box blockage, decreased screening efficiency, and excessive equipment load caused by excessive feeding at one time, ensuring efficient, continuous, and stable operation of the screening process.

[0016] 2. The eccentric roller driven by the motor generates periodic centrifugal force. Combined with the elastic reset effect of the second spring, the centrifugal force will drive the screening box to reciprocate in the horizontal direction at a high frequency and a small amplitude. This vibration mode increases the throwing and tumbling of sand and gravel in the screening box, accelerates the screening process of fine particles, and thus greatly improves the grading and screening speed and accuracy of building sand and gravel of different particle sizes, meeting the strict requirements of modern construction for aggregate gradation.

[0017] 3. The sieve plate and screening box are detachably connected, allowing users to replace the sieve plate with different aperture specifications according to different project needs, greatly enhancing the applicability and flexibility of the equipment. At the same time, it simplifies the daily cleaning, maintenance and replacement process of the sieve plate, reducing the long-term use and maintenance costs of the equipment. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1A three-dimensional structural schematic diagram of a material control and screening device for building sand and gravel provided in an embodiment of the present invention; Figure 2 for Figure 1 The diagram shows a three-dimensional structural schematic of a material control and screening device for building sand and gravel from another angle. Figure 3 for Figure 1 The image shown is a right-hand view of a material control and screening device for building sand and gravel after being cut open. Figure 4 for Figure 1 An exploded view of the material control mechanism in a material control screening device for building sand and gravel is shown. Figure 5 for Figure 1 An exploded view of the adjusting mechanism in a material control screening device for building sand and gravel is shown. Figure 6 for Figure 1 The diagram shown is an exploded view of the screening mechanism in a material control screening device for building sand and gravel.

[0020] Figure label: 10. Bracket; 101. Guide seat; 20. Screening mechanism; 201. Screening box; 2011. Limiting block; 2012. Screen plate; 2013. Receiving box; 202. First spring; 203. Base frame; 2031. Limiting groove; 2032. Hollow seat; 204. Second spring; 205. Motor; 206. Eccentric roller; 30. Material control mechanism; 301. Feeding chamber; 3011. Material discharge channel; 3012. Fixed ring groove; 3013. Annular sliding ring; 302. Material passage; 3021. Material guide channel; 303. First material distribution plate; 304. Second material distribution plate; 305. Hollowed-out material outlet; 306. Bevel gear ring; 307. Bevel gear; 308. Rack; 309. Gear. Detailed Implementation

[0021] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0022] Please see Figures 1 to 3One embodiment of a material control and screening device for construction sand and gravel includes a support 10, a screening mechanism 20, and a material control mechanism 30. The screening mechanism 20 includes a screening box 201 and a first spring 202. The screening box 201 is vertically slidable on the support 10. The first spring 202 connects the support 10 and the screening box 201, providing upward elastic support to the screening box 201. The material control mechanism 30 includes a feeding chamber 301 and an adjusting mechanism. The feeding chamber 301 is mounted on the support 10, and its top end has a vertically opening material drop channel 3011 communicating with the top end of the screening box 201. The adjusting mechanism is located at the bottom end of the feeding chamber 301 and is kinetically connected to the screening box 201, used to decrease or increase the opening at the bottom end of the material drop channel 3011 when the screening box 201 moves downward or upward.

[0023] In the above embodiment, during feeding, the material falls into the screening box 201 through the material discharge channel 3011 for screening. As screening proceeds, the weight of the material to be screened accumulated in the screening box 201 gradually increases. In particular, large particles that cannot pass through the screening temporarily will cause the screening box 201 to move downward and compress the first spring 202. The downward movement of the screening box 201 reduces the opening at the bottom of the material discharge channel 3011 through the adjustment mechanism, thereby automatically reducing the feeding amount. Conversely, when the material in the screening box 201 decreases due to screening, the screening box 201... 01. With reduced weight, the screening box 201 moves upward under the rebound force of the first spring 202, increasing the opening at the bottom of the material drop channel 3011 through the adjustment mechanism, thereby automatically increasing the feeding amount. This facilitates automatic adjustment of the feeding speed based on the real-time weight of the material in the screening box 201, achieving intelligent material control by feeding slowly when there is too much material and feeding quickly when there is too little material. This avoids problems such as clogging of the screening box 201, decreased screening efficiency, and excessive equipment load caused by excessive feeding at one time, ensuring efficient, continuous, and stable operation of the screening process.

[0024] Please see Figure 2 and Figure 3 Based on the above embodiments, the material control mechanism 30 further includes a material passage 302; the material passage 302 is disposed on the support 10 and located between the screening box 201 and the feeding chamber 301. The material passage 302 is provided with a guide channel 3021 that connects the bottom end of the discharge channel 3011 and the top end of the screening box 201. The guide channel 3021 is tapered with its larger end facing the feeding chamber 301. An adjustment mechanism is connected to the bottom end of the feeding chamber 301 and the top end of the material passage 302.

[0025] In the above embodiments, the material guide channel 3021 can guide the material falling from the feed chamber 301 to accurately converge into the screening box 201, reduce the scattering and residue of material during the transmission process, improve the material utilization rate, and at the same time avoid the material from accumulating at the corner of the channel and affecting the screening continuity.

[0026] Please see Figures 2 to 5Specifically, in the above embodiments, the adjustment mechanism includes a first material distribution plate 303, a second material distribution plate 304, and a transmission mechanism. The first material distribution plate 303 is fixed at the top of the material guiding channel 3021, and the second material distribution plate 304 is rotatably disposed at the bottom of the material dropping channel 3011 corresponding to the first material distribution plate 303. Both the first material distribution plate 303 and the second material distribution plate 304 are provided with arrayed hollow material openings 305. The transmission mechanism connects the screening box 201 and the second material distribution plate 304 and is used to drive the second material distribution plate 304 to rotate when the screening box 201 moves downward or upward, so as to reduce or increase the overlap of the hollow material openings 305 in the first material distribution plate 303 and the second material distribution plate 304.

[0027] In the above embodiments, the downward or upward movement of the screening box 201 drives the rotation of the second distribution plate 304 via a transmission mechanism, thereby reducing or increasing the overlap of the perforated material outlets 305 in the first and second distribution plates 303 and 304. By utilizing the change in the overlap of the arrayed perforated material outlets 305 on the first and second distribution plates 303 and 304, the actual material discharge area is adjusted, achieving refined flow control. It can be understood that the material discharge is fastest when the overlap is at its maximum, and slows down when the overlap decreases, adapting to the dynamic changes in the weight of the material within the screening box 201, ensuring slow feeding when there is more material and rapid feeding when there is less material. Furthermore, the array design and overlap adjustment design of the perforated material outlets 305 make it less prone to clogging when material passes through. Compared to the traditional single-channel material control method, this disperses the material's stress points, further reducing the risk of clogging in the screening box 201. Furthermore, the transmission mechanism converts the linear movement of the screening box 201 into the rotation of the second distribution plate 304. The rotation adjustment method of the second distribution plate 304 can better ensure the uniformity of the opening change of the material discharge channel 3011 and avoid local material accumulation.

[0028] Please see Figures 2 to 5 In one embodiment, the transmission mechanism includes a bevel gear ring 306, a bevel gear 307, and a transmission assembly. The bevel gear ring 306 is coaxially arranged around the second distribution disc 304. The bevel gear 307 is rotatably mounted on the feed chamber 301 and meshes with the bevel gear ring 306. The transmission assembly connects the bevel gear 307 and the screening box 201, converting the sliding of the screening box 201 into the rotation of the bevel gear 307. Further, the transmission assembly includes a rack 308 and a gear 309. The rack 308 is vertically slidably mounted on the bracket 10 and connected to the screening box 201. The gear 309 is coaxially mounted on the bevel gear 307 and meshes with the rack 308.

[0029] In the above embodiment, the downward or upward movement of the screening box 201 drives the rack 308 to move downward or upward. The downward or upward movement of the rack 308 meshes with the gear 309, causing the gear 309 to reciprocate. The reciprocating rotation of the gear 309, through the meshing of the bevel gear 307 and the bevel gear ring 306, drives the second distribution plate 304 to reciprocate, thereby reducing or increasing the overlap of the hollow material openings 305 in the first distribution plate 303 and the second distribution plate 304. The meshing transmission of the rack 308 and the gear 309, combined with the meshing transmission of the bevel gear 307 and the bevel gear ring 306, directly converts the vertical sliding of the screening box 201 into the rotation of the second distribution plate 304. The transmission path is short, with no redundant intermediate parts, reducing energy loss and delay in the transmission process, and enabling the second distribution plate 304 to quickly respond to changes in the weight of the screening box 201.

[0030] Specifically, in the above embodiment, two sets of bevel gears 307 are arranged opposite each other, and both sets of bevel gears 307 mesh with bevel gear rings 306. Gears 309 are coaxially arranged on both sets of bevel gears 307. Two sets of racks 308 are correspondingly arranged, and the two sets of racks 308 mesh with the two sets of gears 309 respectively. This further improves the stability of driving the second distribution disc 304 to rotate.

[0031] Please see Figure 4 and Figure 5 Based on the above embodiments, a fixed annular groove 3012 is further provided at the bottom of the feeding chamber 301. An annular sliding ring 3013, coaxial with the material discharge channel 3011, is rotatably disposed within the fixed annular groove 3012. The second material distribution plate 304 is coaxially disposed inside the annular sliding ring 3013, and the conical tooth ring 306 is coaxially disposed outside the annular sliding ring 3013. The fixed annular groove 3012 provides a stable rotation trajectory for the annular sliding ring 3013, ensuring that the annular sliding ring 3013 drives the second material distribution plate 304 and the conical tooth ring 306 to rotate coaxially, avoiding deviation or shaking during rotation, and ensuring the accuracy of the overlap adjustment between the first material distribution plate 303 and the hollow material opening 305 of the second material distribution plate 304. On the other hand, the annular sliding ring 3013 simultaneously bears the inner side of the second material distribution plate 304 and the outer side of the conical tooth ring 306, forming a balanced overall structure, preventing excessive force on a single component and thus improving the stability and durability of the transmission mechanism.

[0032] Please see Figure 2 , Figure 3 and Figure 6In one embodiment, the screening mechanism 20 further includes a base frame 203 and a vibration assembly. The base frame 203 is vertically slidable on the support 10 and is connected to the adjustment mechanism. A first spring 202 connects the support 10 and the base frame 203, providing upward elastic support to the base frame 203. The screening box 201 is horizontally slidable within the base frame 203. The vibration assembly is mounted on the screening box 201 and connected to the base frame 203, driving the screening box 201 to reciprocate. In the above embodiment, driving the screening box 201 to reciprocate via the vibration assembly can improve screening efficiency.

[0033] Specifically, in the above embodiment, both ends of the bottom frame 203 are provided with hollow seats 2032, and two sets of guide seats 101 are arranged opposite each other on the bracket 10. The two sets of hollow seats 2032 are vertically slidably sleeved on the two sets of guide seats 101, and the first spring 202 connects the bottom end of the hollow seat 2032 and the bottom end of the guide seat 101. The cooperation between the hollow seat 2032 and the guide seat 101 ensures the stability of the vertical sliding of the bottom frame 203. It can be understood that the bottom frame 203 is connected to the rack 308 in the adjustment mechanism.

[0034] Specifically, in the above embodiments, limit blocks 2011 are provided at both ends of the screening box 201, and limit grooves 2031 are provided at both ends of the inner side of the bottom frame 203. The two sets of limit blocks 2011 are horizontally slidably disposed in the two sets of limit grooves 2031. The cooperation between the limit blocks 2011 and the limit grooves 2031 ensures the stability of the horizontal sliding of the screening box 201.

[0035] Please see Figure 6 In one embodiment, the vibration assembly includes a second spring 204, a motor 205, and an eccentric roller 206; the second spring 204 is connected to the inner side of the bottom frame 203 on one side of the screening box 201, the motor 205 is fixed on the other side of the screening box 201, and the eccentric roller 206 is fixed at the output end of the motor 205.

[0036] In the above embodiment, the eccentric roller 206 is rotated by the motor 205 to generate periodic centrifugal force. With the elastic reset effect of the second spring 204, the centrifugal force will drive the screening box 201 to perform high-frequency, small-amplitude reciprocating vibration in the horizontal direction. This vibration mode increases the throwing and tumbling of sand and gravel in the screening box 201, accelerates the screening process of fine particles, and thus greatly improves the grading and screening speed and accuracy of building sand and gravel of different particle sizes, meeting the strict requirements of modern construction for aggregate gradation.

[0037] Please see Figure 3 and Figure 6In one embodiment, a screen plate 2012 is detachably mounted on the bottom of the screening box 201, and a receiving box 2013 is located directly below the screen plate 2012. The screen plate 2012 is detachably connected to the screening box 201, allowing users to replace the screen plate 2012 with different aperture specifications according to different project requirements, greatly enhancing the applicability and flexibility of the equipment. At the same time, it simplifies the daily cleaning, maintenance, and replacement process of the screen plate 2012, reducing the long-term use and maintenance costs of the equipment. The receiving box 2013 can accurately collect qualified sand and gravel that has passed through the screen, preventing material spillage, improving material collection efficiency, and facilitating the subsequent transfer and use of qualified materials.

[0038] Specifically, in the above embodiment, the sieve plate 2012 is fixed to the bottom of the screening box 201 by bolts. Installing and disassembling the sieve plate 2012 is convenient.

[0039] The specific method of using the above-mentioned material control and screening device for building sand and gravel is as follows: First, place the device in a flat position and fix it. Select and install the appropriate screen plate 2012 according to the particle size specifications of the sand and gravel to be screened.

[0040] Then, the construction sand and gravel to be screened is put into the material discharge channel 3011 of the feeding chamber 301, and the material falls into the screening box 201 through the overlapping hollow material outlet 305 in the second material distribution plate 304 and the first material distribution plate 303.

[0041] Then, the starting motor 205 drives the eccentric roller 206 to rotate and generate periodic centrifugal force. Combined with the elastic reset effect of the second spring 204, it pushes the screening box 201 to perform high-frequency, small-amplitude reciprocating vibration in the horizontal direction, so that the qualified particle size of sand and gravel passes through the screen plate 2012 and falls into the receiving box 2013.

[0042] During the screening process, the weight of the material to be screened accumulated in the screening box 201 gradually increases, causing the screening box 201 to move downward. The downward movement of the screening box 201 drives the bottom frame 203 to move downward and compresses the first spring 202. At the same time, the downward movement of the bottom frame 203 drives the rack 308 to move downward. The downward movement of the rack 308 meshes with the gear 309, driving the bevel gear 307 to rotate. The rotation of the bevel gear 307 meshes with the bevel gear ring 306, driving the second material distribution plate 304 to rotate. The rotation of the second material distribution plate 304 reduces the overlap of the hollow material openings 305 in the first material distribution plate 303 and the second material distribution plate 304, thereby reducing the opening at the bottom of the material drop channel 3011 and automatically reducing the amount of material fed.

[0043] Conversely, when the material in the screening box 201 decreases due to screening, the weight of the screening box 201 decreases. Under the rebound force of the first spring 202, the bottom frame 203 drives the screening box 201 to move upward, simultaneously driving the rack 308 to move upward. The upward movement of the rack 308 meshes with the gear 309, driving the bevel gear 307 to rotate in the opposite direction. The reverse rotation of the bevel gear 307 meshes with the bevel gear ring 306, driving the second distribution disc 304 to rotate in the opposite direction. The reverse rotation of the second distribution disc 304 increases the weight of the first distribution disc. The overlap of the hollow material inlets 305 in the first and second material trays 303 and 304 is increased to enlarge the opening at the bottom of the material drop channel 3011, thereby automatically increasing the feeding amount. This facilitates the automatic adjustment of the feeding speed based on the real-time weight of the material in the screening box 201, achieving intelligent material control by feeding slowly when there is too much material and feeding quickly when there is too little material. This avoids problems such as blockage of the screening box 201, decreased screening efficiency, and excessive equipment load caused by feeding too much material at once, ensuring efficient, continuous, and stable operation of the screening process.

[0044] Meanwhile, during the screening process, the speed of motor 205 can be adjusted to change the vibration frequency according to the screening efficiency and material condition, thereby improving the applicability of the device. It is understood that the adjustment of motor 205 speed is existing technology and will not be elaborated upon further.

[0045] Finally, after the screening operation is completed, turn off the motor 205, disassemble and clean or replace the screen plate 2012, and regularly inspect and lubricate the moving parts.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A material control and screening device for building sand and gravel, characterized in that, include: Support (10); The screening mechanism (20) includes a screening box (201) and a first spring (202); the screening box (201) is vertically slidably mounted on the support (10), and the first spring (202) connects the support (10) and the screening box (201) to provide an upward elastic support force to the screening box (201); and The material control mechanism (30) includes a feeding chamber (301) and an adjustment mechanism. The feeding chamber (301) is mounted on the support (10) and has a vertically opening at its top that connects to the top of the screening box (201). The adjustment mechanism is located at the bottom of the feeding chamber (301) and is connected to the screening box (201) for driving. It is used to reduce or increase the opening at the bottom of the material discharge channel (3011) when the screening box (201) moves downward or upward.

2. The material control and screening device for building sand and gravel according to claim 1, characterized in that, The material control mechanism (30) also includes a material passage hopper (302); the material passage hopper (302) is disposed on the support (10) and located between the screening box (201) and the feeding chamber (301). The material passage hopper (302) is provided with a guide channel (3021) connecting the bottom end of the discharge channel (3011) and the top end of the screening box (201). The guide channel (3021) is tapered with its larger end facing the feeding chamber (301). The adjustment mechanism connects the bottom end of the feeding chamber (301) and the top end of the material passage hopper (302).

3. The material control and screening device for building sand and gravel according to claim 2, characterized in that, The adjustment mechanism includes a first distribution plate (303), a second distribution plate (304), and a transmission mechanism. The first distribution plate (303) is fixed at the top of the material guide channel (3021), and the second distribution plate (304) is rotatably disposed at the bottom of the material drop channel (3011) corresponding to the first distribution plate (303). Both the first distribution plate (303) and the second distribution plate (304) are provided with arrayed hollow material openings (305). The transmission mechanism connects the screening box (201) and the second distribution plate (304) and is used to drive the second distribution plate (304) to rotate when the screening box (201) moves downward or upward, so as to reduce or increase the overlap of the hollow material openings (305) in the first distribution plate (303) and the second distribution plate (304).

4. The material control and screening device for building sand and gravel according to claim 3, characterized in that, The transmission mechanism includes a bevel ring (306), a bevel gear (307), and a transmission assembly; the bevel ring (306) is coaxially arranged on the periphery of the second distribution disc (304), the bevel gear (307) is rotatably arranged on the feed chamber (301) and meshes with the bevel ring (306), and the transmission assembly connects the bevel gear (307) and the screening box (201) to convert the sliding of the screening box (201) into the rotation of the bevel gear (307).

5. A material control and screening device for building sand and gravel according to claim 4, characterized in that, The bottom of the feeding chamber (301) is provided with a fixed ring groove (3012). A ring-shaped sliding ring (3013) coaxial with the material discharge channel (3011) is rotatably arranged in the fixed ring groove (3012). The second material distribution plate (304) is coaxially arranged inside the ring-shaped sliding ring (3013), and the conical tooth ring (306) is coaxially arranged outside the ring-shaped sliding ring (3013).

6. A material control and screening device for building sand and gravel according to claim 4, characterized in that, The transmission assembly includes a rack (308) and a gear (309); the rack (308) is vertically slidably disposed on the bracket (10) and connected to the screening box (201); the gear (309) is coaxially disposed on the bevel gear (307) and meshes with the rack (308).

7. A material control and screening device for building sand and gravel according to claim 1, characterized in that, The screening mechanism (20) further includes a bottom frame (203) and a vibration component; the bottom frame (203) is vertically slidably mounted on the support (10) and is connected to the adjustment mechanism in a transmission manner; the first spring (202) connects the support (10) and the bottom frame (203) to provide an upward elastic support force to the bottom frame (203); the screening box (201) is horizontally slidably mounted inside the bottom frame (203); the vibration component is mounted on the screening box (201) and connected to the bottom frame (203) to drive the screening box (201) to slide back and forth.

8. A material control and screening device for building sand and gravel according to claim 7, characterized in that, The screening box (201) is provided with limit blocks (2011) at both ends, and the bottom frame (203) is provided with limit grooves (2031) at both ends on the inner side. The two sets of limit blocks (2011) are horizontally slidably arranged in the two sets of limit grooves (2031).

9. A material control and screening device for building sand and gravel according to claim 7, characterized in that, The vibration assembly includes a second spring (204), a motor (205), and an eccentric roller (206); the second spring (204) is connected to the inner side of the bottom frame (203) on one side of the screening box (201), the motor (205) is fixed on the other side of the screening box (201), and the eccentric roller (206) is fixed at the output end of the motor (205).

10. A material control and screening device for building sand and gravel according to claim 1, characterized in that, The bottom of the screening box (201) is detachably provided with a sieve plate (2012), and a receiving box (2013) is provided directly below the sieve plate (2012).

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