A device for grading crushed stone for construction work

Abstract

The application relates to the technical field of crushed stone processing in construction engineering, and particularly discloses a crushed stone grading device for construction engineering, which comprises a crushed stone grading machine main body, a first grading unit is arranged in the middle of the crushed stone grading machine main body, an upper feeding frame is arranged on the upper side of the crushed stone grading machine main body, a second grading unit and a third grading unit are sequentially arranged on the lower side of the crushed stone grading machine main body, one side of the third grading unit is provided with a discharging port, a falling object bin is arranged in the middle of the third grading unit, and an auger blade is arranged in the falling object bin. The crushed stone enters the first grading unit from the feeding frame, large-diameter crushed stone is discharged, smaller crushed stone falls into the second grading unit for secondary screening, medium crushed stone is discharged, and fine crushed stone falls into the falling object bin of the third grading unit and is conveyed to the discharging port by the auger blade. A driving motor synchronously drives the first grading unit and the auger blade to work through a linkage assembly. The device can complete three-stage grading and fine material conveying at one time, reduces equipment series connection and crushed stone transfer, realizes continuous grading, realizes smooth discharging, reduces independent motors and fault points through synchronous driving, and is stable in operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of broken stone processing in construction engineering, and particularly relates to a broken stone grading device for construction engineering. BACKGROUND

[0002] In construction engineering, broken stone is commonly used as aggregate in construction links such as concrete, mortar, roadbed cushion, and foundation backfill. Broken stone is generally obtained by crushing with jaw crushers, impact crushers and other equipment. The particle size distribution of the broken stone is wide, and often contains large, medium and small broken stones. Different construction sites have different requirements for the particle size of broken stone. For example, coarse aggregate for concrete, broken stone for roadbed cushion, and broken stone for backfill have obvious differences in suitable particle size ranges. If the particle size of broken stone is mixed, it will not only affect the concrete mix ratio and molding quality, but also affect the roadbed compaction, cushion flatness and compaction effect of the backfill layer. Therefore, before the broken stone is used, it is usually classified according to particle size so as to be respectively put into different construction links.

[0003] The broken stone grading device used in existing construction engineering mostly uses single-layer or double-layer screen meshes for screening, and some use vibrating screens, drum screens, and inclined screen meshes. This kind of device generally puts the broken stone from the feeding port onto the screen mesh, and uses the screen mesh aperture to screen out the broken stone smaller than the aperture, and the broken stone larger than the aperture is discharged from one end of the screen mesh. Although double-layer screen meshes can divide out one more level, due to the limitation of the number of screen mesh layers, installation space and screen hole size, in actual use, it can only complete two-level screening, or the classification effect is not stable enough. If large, medium and small three-level broken stones are needed at the construction site, usually multiple screening devices need to be connected in series, or a part of the broken stone is screened out first, and then transferred to another device for secondary screening through a loader, a conveying belt or other equipment. This not only increases the number of devices and the occupied area, but also increases the transfer cost and labor cost. The broken stone is also easy to mix again in the multiple transfer processes, which affects the final classification effect. In addition, the gap between the existing screen meshes or screen rollers is mostly a fixed structure, and when encountering wet, flaky or needle-shaped broken stone, it is easy to cause blockage and material jamming. The medium particle size broken stone is easy to be stuck in the screen hole or gap, causing slow discharge of the discharge port, and in severe cases, the machine needs to be stopped for cleaning.

[0004] 1. Existing crushed stone grading devices typically use single-layer screens, which can often only separate one or two particle sizes of crushed stone in a single operation. If it is necessary to obtain large, medium, and small crushed stone simultaneously, multiple devices often need to be connected in series, or a loader or conveyor belt is used for secondary screening after initial screening. This process involves many steps, requires a large area, and incurs high transportation costs. Moreover, the crushed stone is prone to re-mixing during transportation, resulting in incomplete grading. At the same time, the existing screens or screen rollers have fixed gaps, which are prone to clogging when encountering damp or flaky crushed stone. Medium-sized crushed stone is easily stuck in the screen holes or gaps, causing poor material flow and slow discharge from the outlet.

[0005] 2. Dispersed drive mechanisms make it difficult to synchronize screening and conveying. In existing devices, the screening component and the bottom fine material conveying component are often driven by different motors, or only the screening component is driven, with the bottom fine gravel relying on manual cleaning. When multiple motors work independently, it is difficult to keep the start-up time, speed, and load changes consistent, and the screening speed and the bottom auger conveying speed are prone to mismatch. After the fine gravel falls into the material hopper, if it cannot be conveyed out in time, it is easy to accumulate in the hopper, and in severe cases, it will block the discharge port; while the conveying component operating alone will increase energy consumption and the number of failure points. Summary of the Invention

[0006] The purpose of this invention is to provide a crushed stone grading device for construction engineering, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A crushed stone grading device for construction engineering includes a crushed stone grading machine body. A first grading unit is fixedly installed in the middle of the crushed stone grading machine body. A feeding frame is fixedly installed above the first grading unit. A second grading unit is arranged directly below the first grading unit. A third grading unit is arranged below the second grading unit. One side of the third grading unit is a discharge port. The third grading unit is fixedly connected to the crushed stone grading machine body. A protective component is fixedly installed on the outer wall of the third grading unit. A discharge bin is opened in the middle of the third grading unit. An auger blade is installed inside the discharge bin. A drive motor is fixedly installed on the front exterior of the crushed stone grading machine body. A linkage component is installed on one side of the drive motor.

[0008] Preferably, the linkage component includes a drive sprocket, which is mounted on the output end of the drive motor via a coupling. A driven sprocket is disposed above the drive sprocket, and a first chain is meshed with the outer wall of the drive sprocket on the driven sprocket. The driven sprocket is larger than the drive sprocket. A drive bottom shaft is fixedly mounted in the middle of the driven sprocket. Several sets of auxiliary sprockets are disposed behind the driven sprocket, and a second chain is meshed with the outer wall of the auxiliary sprockets. Both ends of the drive bottom shaft pass through the outer wall of the main body of the crushing and grading machine and are rotatably connected to the outer wall of the main body of the crushing and grading machine via bearings.

[0009] Preferably, the linkage assembly further includes a first drive wheel, which is fixedly mounted on the rear end of the drive shaft. A second drive wheel is disposed directly below the first drive wheel. A first toothed belt meshes with the outer wall of the first drive wheel on the second drive wheel. A drive bevel gear is fixedly connected to the rear end of the second drive wheel. A driven bevel gear meshes with the outer wall of the drive bevel gear. The drive bevel gear and the driven bevel gear are distributed at a 90-degree angle. A fourth drive wheel is fixedly connected to the outer wall of the driven bevel gear. A third drive wheel is disposed on the horizontal side of the fourth drive wheel. A second toothed belt meshes with the outer wall of the fourth drive wheel on the third drive wheel. A connecting shaft is fixedly connected to one end of the third drive wheel near the main body of the crushing and grading machine. The other end of the connecting shaft passes through the protective assembly and is fixedly connected to the outer wall of the auger blade.

[0010] Preferably, the first drive wheel, the second drive wheel and the third drive wheel have the same structure, and the first drive wheel has a gear in the middle.

[0011] Preferably, the first grading unit includes a fixed frame fixed to the middle of the main body of the stone crushing and grading machine. Several support rollers are rotatably installed in the middle of the fixed frame. The support rollers are distributed in an inclined manner. A gap for the stone crushing to fall is provided between two adjacent support rollers. Several rolling blocks with a triangular structure are distributed at equal intervals on the outer wall of the support rollers. A first feeding plate is fixedly connected to the side of the fixed frame away from the feeding frame.

[0012] Preferably, each of the support rollers is fixedly connected to a drive shaft on the side near the drive motor, and the drive shaft passes through the outer wall of the main body of the stone crushing and grading machine and is fixedly connected to the auxiliary sprocket.

[0013] Preferably, the second grading unit includes an inclined support frame, which is fixed inside the main body of the stone crushing and grading machine and directly below the support roller. A filter screen is fixedly installed in the middle of the support frame, a second discharge plate is fixedly installed on the side of the support frame near the feed frame, and a baffle plate is fixedly installed on the other side of the support frame.

[0014] Preferably, the protective component includes a fixing plate, which is fixedly installed on the side of the third grading unit away from the discharge port. A protective frame is fixedly connected to the outside of the fixing plate. The fourth drive wheel, the second toothed belt and the third drive wheel are located inside the protective frame. A mounting frame is provided on one side of the protective frame. The drive bevel gear and the driven bevel gear are rotatably installed inside the mounting frame.

[0015] The beneficial effects of this invention are as follows: 1. To address the problems of insufficient fine grading and difficulty in three-stage screening in existing devices, this device sequentially sets up a first grading unit, a second grading unit, and a third grading unit within the main body of the crushed stone grading machine. After the crushed stone enters from the feeding frame, it first passes through the inclined support rollers and triangular rolling blocks of the first grading unit. Large-diameter crushed stone is guided by the rolling blocks to the first discharge plate for discharge, while smaller crushed stone falls through the gap between adjacent support rollers. The fallen crushed stone then undergoes secondary screening through the inclined filter screen of the second grading unit. Medium-diameter crushed stone is blocked by the baffle plate and discharged through the second discharge plate, while the smallest crushed stone falls into the discharge bin of the third grading unit. In this way, the grading of large, medium, and small crushed stone can be completed in one feeding, eliminating the need for multiple devices connected in series and the need for secondary screening using loaders and conveyor belts after screening. This reduces processes, floor space, and transportation costs, while also preventing the crushed stone from mixing again during transportation, resulting in more thorough grading. In addition, the combination of inclined support rollers, triangular rolling blocks and inclined filter screens is conducive to the tumbling and feeding of crushed stone, which can reduce the probability of wet and flaky crushed stone getting stuck in the screen holes or gaps, reduce clogging, and improve the smoothness of feeding and the efficiency of discharge.

[0016] 2. This device employs a single drive motor in conjunction with a linkage assembly for centralized driving. After the drive motor starts, it transmits power through the drive sprocket, first chain, driven sprocket, and drive shaft. The drive shaft, on one hand, drives the support rollers to rotate synchronously via the auxiliary sprocket and second chain; on the other hand, it transmits power to the connecting shaft and auger blades through the first drive wheel, first toothed belt, second drive wheel, drive bevel gear, driven bevel gear, fourth drive wheel, second toothed belt, and third drive wheel. In this way, the screening components of the first grading unit and the auger blades in the discharge bin of the third grading unit are synchronously driven by the same power source. The smallest crushed stones, after falling into the discharge bin, are promptly conveyed to the discharge port by the auger blades, preventing accumulation within the bin and reducing the likelihood of clogging the discharge port. Simultaneously, it eliminates the need for multiple independent drive motors, reducing energy consumption and potential failure points; the centralized transmission structure also facilitates on-site maintenance and debugging.

[0017] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 Another perspective structural diagram; Figure 3 This is a schematic cross-sectional view of the present invention; Figure 4 This is a side view of the structure of the present invention; Figure 5 This is a partial structural diagram of the present invention; Figure 6 for Figure 5 Another perspective structural diagram; Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a three-dimensional structural diagram of the linkage component of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the second hierarchical unit of the present invention.

[0019] In the picture: 1. Main body of the crushing and grading machine; 2. First grading unit; 201. Fixed frame; 202. Support roller; 203. Rolling block; 204. First feeding plate; 3. Third grading unit; 4. Drop chamber; 5. Feeding frame; 6. Drive motor; 7. Linkage assembly; 701. Drive sprocket; 702. First chain; 703. Driven sprocket; 704. Auxiliary sprocket; 705. Second chain; 706. Drive bottom shaft; 707. First drive wheel; 70 8. First toothed belt; 709. Second drive wheel; 710. Drive bevel gear; 711. Driven bevel gear; 712. Fourth drive wheel; 713. Second toothed belt; 714. Third drive wheel; 715. Connecting shaft; 8. Second grading unit; 801. Support frame; 802. Barrier plate; 803. Filter screen; 804. Second feed plate; 9. Protective components; 901. Fixing plate; 902. Protective frame; 903. Mounting frame; 10. Screwdriver blades. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0021] The crushed stone is first initially crushed by crushing equipment, and then graded by the crushed stone grading device.

[0022] Please see Figures 1 to 9A crushed stone grading device for construction engineering includes a crushed stone grading machine body 1, a first grading unit 2 fixedly installed in the middle of the crushed stone grading machine body 1, a feeding frame 5 fixedly installed above the first grading unit 2, a second grading unit 8 arranged directly below the first grading unit 2, a third grading unit 3 arranged below the second grading unit 8, a discharge port on one side of the third grading unit 3, the third grading unit 3 being fixedly connected to the crushed stone grading machine body 1, a protective component 9 fixedly installed on the outer wall of the third grading unit 3, a dropping chamber 4 opened in the middle of the third grading unit 3, an auger blade 10 installed inside the dropping chamber 4, a drive motor 6 fixedly installed on the front exterior of the crushed stone grading machine body 1, and a linkage component 7 installed on one side of the drive motor 6.

[0023] After the crushed stone is fed into the feeding frame 5, it first enters the first grading unit 2 in the middle of the main body 1 of the crushing and grading machine. In the first grading unit 2, the larger-diameter crushed stone is separated and discharged outwards, while the smaller-diameter crushed stone falls downwards to the second grading unit 8 directly below the first grading unit 2. The crushed stone after falling into the second grading unit 8 undergoes a second grading. The medium-diameter crushed stone is separated and discharged outwards, while the even smaller-diameter crushed stone continues to fall downwards into the third grading unit 3 below the second grading unit 8 and enters the discharge bin 4 in the middle of the third grading unit 3. The auger blades 10 in the discharge bin 4 rotate, conveying the fine crushed stone to the discharge port on one side of the third grading unit 3. At the same time, the drive motor 6 on the front exterior of the main body 1 of the crushing and grading machine starts, and drives the corresponding parts to move through the linkage component 7 on one side. The protective component 9 on the outer wall of the third grading unit 3 shields and protects the transmission parts. In this way, the crushed stone completes the first, second, and third stages of grading sequentially within the main body 1 of a single crushing and grading machine, and also completes the fine crushed stone conveying. This eliminates the need for multiple machines connected in series, and also eliminates the need for secondary screening using loaders and conveyor belts after screening. This reduces the number of processes, equipment, floor space, and transportation costs. At the same time, it avoids the crushed stone from mixing again during transportation, making the grading of large, medium, and small crushed stone clearer. The auger blades 10 can promptly push the fine crushed stone in the discharge bin 4 towards the discharge port, preventing the fine crushed stone from accumulating in the bin and making the discharge smoother. The drive motor 6 and the linkage component 7 are centrally driven, reducing independent drive mechanisms and facilitating synchronous operation and on-site maintenance. The protective component 9 can reduce the entry of crushed stone and dust into the transmission parts, reduce material jamming and wear, and improve operational safety and stability.

[0024] like Figures 7-8As shown, the linkage assembly 7 includes a drive sprocket 701, which is mounted on the output end of the drive motor 6 via a coupling. A driven sprocket 703 is positioned above the drive sprocket 701. A first chain 702 is meshed between the driven sprocket 703 and the outer wall of the drive sprocket 701. The size of the driven sprocket 703 is larger than that of the drive sprocket 701. A drive shaft 706 is fixedly mounted in the middle of the driven sprocket 703. Several sets of auxiliary sprockets 704 are positioned behind the driven sprocket 703. A second chain 705 is meshed between the outer walls of the auxiliary sprockets 704 and the drive shaft 706. Both ends of the drive shaft 706 penetrate the outer wall of the crusher body 1 and are rotatably connected to the outer wall of the crusher body 1 via bearings. The linkage assembly 7 also includes a first drive wheel 707, which is fixedly mounted at the rear end of the drive shaft 706. A second drive wheel 709 is located directly below a drive wheel 707. The second drive wheel 709 is meshed with the outer wall of the first drive wheel 707 by a first toothed belt 708. A drive bevel gear 710 is fixedly connected to the rear end of the second drive wheel 709. A driven bevel gear 711 is meshed with the outer wall of the drive bevel gear 710. The drive bevel gear 710 and the driven bevel gear 711 are distributed at a 90-degree angle. A fourth drive wheel 712 is fixedly connected to the outer wall of the driven bevel gear 711. A third drive wheel 714 is located on the horizontal side of the fourth drive wheel 712. A second toothed belt 713 is meshed with the outer walls of the fourth drive wheel 712 and the third drive wheel 714. A connecting shaft 715 is fixedly connected to one end of the third drive wheel 714 near the main body 1 of the crushing and grading machine. The other end of the connecting shaft 715 passes through the protective component 9 and is fixedly connected to the outer wall of the auger blade 10. The specific implementation is as follows: After the drive motor 6 starts, the drive sprocket 701 rotates, which in turn drives the driven sprocket 703 to rotate via the first chain 702. The driven sprocket 703 drives the drive shaft 706 to rotate. The drive shaft 706 drives the support roller 202 to rotate via the auxiliary sprocket 704 and the second chain 705, and also drives the first drive wheel 707 to rotate. The first drive wheel 707 drives the second drive wheel 709 to rotate via the first toothed belt 708. The second drive wheel 709 drives the drive bevel gear 710 to rotate, and the drive bevel gear 710 drives the driven bevel gear 711 to rotate in the opposite direction. The moving bevel gear 711 drives the fourth drive wheel 712 to rotate, and the fourth drive wheel 712 drives the third drive wheel 714 to rotate through the second toothed belt 713. The third drive wheel 714 drives the auger blade 10 to rotate through the connecting shaft 715. In this way, only one drive motor 6 is needed to make the screening components and the auger blade 10 move synchronously, reducing independent motors and failure points. It is easy to keep the start-up and speed consistent, and the screening speed is matched with the fine material conveying speed. The driven sprocket 703 is larger than the drive sprocket 701, which can reduce the speed and increase the torque, making the support roller 202 and the auger blade 10 run more smoothly.

[0025] Furthermore, the first drive wheel 707, the second drive wheel 709 and the third drive wheel 714 have the same structure. The first drive wheel 707 has a gear in the middle. The identical structure facilitates interchangeability, installation and maintenance. The gear in the middle of the first drive wheel 707 meshes stably with the first toothed belt 708, ensuring reliable transmission and reducing the types of spare parts and maintenance costs.

[0026] like Figure 2 As shown, the first grading unit 2 includes a fixed frame 201 fixed in the middle of the main body 1 of the crushing and grading machine. Several support rollers 202 are rotatably installed in the middle of the fixed frame 201. The support rollers 202 are distributed in an inclined manner. There is a gap between two adjacent support rollers 202 for crushed stone to fall. Several rolling blocks 203 with a triangular structure are distributed at equal intervals on the outer wall of the support rollers 202. A first feeding plate 204 is fixedly connected to the side of the fixed frame 201 away from the feeding frame 5. The number of support rollers 202 is 9; The specific implementation is as follows: After the crushed stone enters the fixed frame 201 from the feeding frame 5, it falls onto the inclined support roller 202. When the support roller 202 rotates, the triangular rolling block 203 pushes the large crushed stone toward the first discharge plate 204 and discharges it. The small crushed stone falls through the gap between the adjacent support rollers 202. In this way, the first stage of screening is completed, separating the large and small crushed stones. The inclined support roller 202 and the triangular rolling block 203 can also reduce the crushed stone jamming and blockage, and improve the smoothness of the discharge.

[0027] Furthermore, each support roller 202 is fixedly connected to a drive shaft near the drive motor 6. The drive shaft passes through the outer wall of the main body 1 of the crushing and grading machine and is fixedly connected to the auxiliary sprocket 704. When the auxiliary sprocket 704 rotates, it drives the drive shaft to rotate, and the drive shaft then drives the support roller 202 to rotate. The support roller 202 can be uniformly driven by the linkage component 7, reducing the need for separate drive motors and ensuring that each support roller 202 rotates in a consistent manner, so that the crushing and screening are continuous and stable.

[0028] like Figure 9 As shown, the second grading unit 8 includes a support frame 801 installed at an angle. The support frame 801 is fixed inside the main body 1 of the stone crushing and grading machine. The support frame 801 is located directly below the support roller 202. A filter screen 803 is fixedly installed in the middle of the support frame 801. A second discharge plate 804 is fixedly installed on the side of the support frame 801 near the feed frame 5. A baffle plate 802 is fixedly installed on the other side of the support frame 801. The specific implementation is as follows: The gravel falling from the gap of the support roller 202 falls onto the inclined support frame 801. After being screened by the filter screen 803, the medium-sized gravel moves along the filter screen 803 to the second feed plate 804. The baffle plate 802 prevents the medium-sized gravel from entering the third grading unit 3. The smallest gravel falls through the filter screen 803, which can complete the second-stage screening, allowing the medium-sized gravel to be discharged separately, avoiding the mixing of medium-sized gravel with fine gravel, and improving the accuracy of the third-stage grading. As one embodiment, the second grading unit 8 can also be equipped with a vibration motor and a shock-absorbing spring. The vibration motor is fixedly installed at the bottom of the support frame 801, and the shock-absorbing spring is installed between the support frame 801 and the inner side of the crushing and grading machine body 1. During operation, the vibrating motor generates excitation force, causing the support frame 801 and the filter screen 803 in the middle to vibrate together. After the gravel falling from the gap of the support roller 202 lands on the filter screen 803, it continuously tumbles under the combined action of the inclined filter screen 803 and the vibration and moves towards the second discharge plate 804. Medium-sized gravel is blocked by the baffle plate 802 and discharged by the second discharge plate 804, while smaller gravel quickly passes through the filter screen 803 under the action of vibration and falls into the third grading unit 3. The shock-absorbing spring expands and contracts with the vibration of the support frame 801, absorbing and buffering the impact from the vibrating motor, reducing the rigid collision and noise between the support frame 801 and the main body 1 of the gravel grading machine, making the filter screen 803 less likely to be blocked by moisture or flaky gravel, making screening smoother, the second grading unit 8 runs more stably, and the grading efficiency is higher.

[0029] like Figure 1 As shown, the protective component 9 includes a fixing plate 901, which is fixedly installed on the side of the third grading unit 3 away from the discharge port. A protective frame 902 is fixedly connected to the outside of the fixing plate 901. The fourth drive wheel 712, the second toothed belt 713 and the third drive wheel 714 are located inside the protective frame 902. A mounting frame 903 is provided on one side of the protective frame 902. The drive bevel gear 710 and the driven bevel gear 711 are rotatably installed inside the mounting frame 903. The specific implementation is as follows: The fixing plate 901 is fixedly installed on the side of the third grading unit 3 away from the discharge port, providing support and fixation for the protective frame 902 and the mounting frame 903. When the fourth drive wheel 712 rotates, the second toothed belt 713 and the third drive wheel 714 move inside the protective frame 902, and the drive bevel gear 710 and the driven bevel gear 711 mesh and rotate inside the mounting frame 903. In this way, the protective component 9 can cover the transmission components such as the fourth drive wheel 712, the second toothed belt 713, the third drive wheel 714, the drive bevel gear 710, and the driven bevel gear 711, making it difficult for gravel and dust to enter the transmission parts, reducing the jamming, skipping teeth, and wear caused by gravel getting stuck in the toothed belt or gears, and also preventing operators from accidentally touching the exposed rotating parts, thus improving operational safety. At the same time, the transmission components are concentrated inside the protective frame 902 and the mounting frame 903, which facilitates daily inspection, maintenance, and lubrication, reduces failure points and maintenance frequency, and enables the third grading unit 3 and the auger blade 10 to work stably and continuously.

[0030] In this embodiment, the drive motor 6 is a YE3 series high-efficiency energy-saving three-phase asynchronous motor, specifically model YE3-132M-4, with a rated power of 7.5kW, a rated speed of 1440r / min, a rated voltage of 380V, and a protection rating of IP55. The output end of this motor is fixedly connected to the drive sprocket 701 via a coupling. The drive sprocket 701 drives the driven sprocket 703 to rotate via the first chain 702. Since the size of the driven sprocket 703 is larger than the size of the drive sprocket 701, the power is transmitted through the driven sprocket 703 to the driven sprocket 702. After the sprocket 703 reduces speed and increases torque, it transmits the torque to the drive shaft 706. The drive shaft 706 then drives the auxiliary sprocket 704 and the first drive wheel 707 to move, thereby driving the support roller 202 and the auger blade 10 to operate synchronously. When the amount of crushed stone to be processed is large or the load is high, a YE3-160M-6 type three-phase asynchronous motor with a power of 7.5 to 11 kW and a speed of 970 to 1440 r / min can also be selected, as long as it can meet the synchronous drive requirements of the support roller 202 and the auger blade 10.

[0031] To better understand the technical solution defined in the claims, this embodiment is further described as follows: The first grading unit 2, the second grading unit 8, and the third grading unit 3 are arranged sequentially from top to bottom along the height direction of the main body 1 of the crushing and grading machine, forming a continuous material feeding channel. The gap between adjacent support rollers 202 in the first grading unit 2 constitutes the first-stage screening gap. The axes of the support rollers 202 are parallel to each other and inclined along the direction from the feeding frame 5 to the first discharge plate 204. The triangular rolling block 203 rotates synchronously with the support rollers 202, pushing large-diameter crushed stones that cannot pass through the gap toward the first discharge plate 204. The crushed stones that can pass through the gap fall into the second grading unit 8 directly below. The support frame 801 and filter screen 803 of the first-stage unit 8 are arranged at an angle. The aperture of the filter screen 803 is smaller than the first-stage screening gap. Medium-sized crushed stone is blocked by the baffle plate 802 and discharged by the second discharge plate 804. Fine crushed stone passes through the filter screen 803 and falls into the third-stage unit 3 directly below. The discharge bin 4 of the third-stage unit 3 is connected to the discharge port. The auger blades 10 are arranged along the length of the discharge bin 4, and their rotation direction is adapted to the rotation direction of the connecting shaft 715 to continuously push the fine crushed stone towards the discharge port. In the linkage assembly 7, the two ends of the drive bottom shaft 706 are supported by bearings on the crushed stone distribution. The main body 1 of the stage machine has an auxiliary sprocket 704 that corresponds to the drive shaft of each support roller 202 and is synchronously driven by a second chain 705. The first drive wheel 707 at the rear end of the drive shaft 706 drives the second drive wheel 709 via a first toothed belt 708. The drive bevel gear 710 at the rear end of the second drive wheel 709 meshes with the driven bevel gear 711 at a 90-degree angle and reverses direction. The driven bevel gear 711 drives the fourth drive wheel 712, which in turn drives the third drive wheel 714 via a second toothed belt 713. The third drive wheel 714 drives the auger blades 10 via a connecting shaft 715, thus achieving… The same drive motor 6 synchronously drives the support roller 202 and the auger blade 10; the fixing plate 901 of the protective component 9 is fixed to the side of the third grading unit 3 away from the discharge port; the protective frame 902 covers the fourth drive wheel 712, the second toothed belt 713 and the third drive wheel 714; the mounting frame 903 covers the drive bevel gear 710 and the driven bevel gear 711; the above fixed connection, fixed installation and rotating connection can all adopt conventional connection methods in the field; the screening gap, filter screen 803 aperture, tilt angle and transmission ratio can be set according to the target crushed stone particle size and processing volume.

[0032] The working process of this crushed stone grading device for construction engineering is as follows: First, the external power supply of the drive motor 6 is turned on. After the output of the drive motor 6 is started, it drives the drive sprocket 701 to start rotating counterclockwise. The drive sprocket 701 drives the driven sprocket 703 above to start working through the first chain 702. The driven sprocket 703 drives the auxiliary sprocket 704 to work through the drive shaft 706. When the auxiliary sprocket 704 rotates, the second chain 705 on the outer wall causes the support roller 202 to rotate counterclockwise synchronously. The crushed stone required in the construction project enters the feeding frame 5 through the feeding device. After passing through the feeding frame 5, it reaches the fixed frame 201 part of the first grading unit 2. The rotating rolling block 203 guides the larger crushed stone to the first discharge plate 204 and then discharges it. The smaller crushed stone falls through the gap of the support roller 202 into the second grading unit 8. After falling into the support frame 801 of the second grading unit 8, it is screened again by the inclined filter screen 803. The baffle plate 802 can prevent some medium-sized crushed stone from entering the third grading unit 3. Then the medium-sized crushed stone is discharged from the second discharge plate 804, and the smallest crushed stone will pass through the filter screen 803 to reach the third grading unit 3. The rotation of the drive shaft 706 will synchronously drive the first drive wheel 707 to rotate counterclockwise. The first drive wheel 707 drives the second drive wheel 709 to rotate synchronously through the external first toothed belt 708. The second drive wheel 709 then drives the drive bevel gear 710 to rotate. After the reverse operation of the driven bevel gear 711, the fourth drive wheel 712 is synchronously driven. The fourth drive wheel 712 drives the third drive wheel 714 to rotate synchronously through the second toothed belt 713. Finally, the third drive wheel 714 drives the auger blade 10 to rotate synchronously through the connecting shaft 715. Therefore, after the drive motor 6 starts, it can synchronously drive the rolling block 203 and the auger blade 10 to work. After the smallest crushed stone enters the drop chamber 4 of the third grading unit 3, the screw conveyor blades 10 continue to rotate, thereby conveying the smallest crushed stone to the discharge port side.

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A crushed stone grading device for construction engineering, characterized in that: The machine includes a main body (1) of a crushing and grading machine. A first grading unit (2) is fixedly installed in the middle of the main body (1). A feeding frame (5) is fixedly installed above the first grading unit (2). A second grading unit (8) is set directly below the first grading unit (2). A third grading unit (3) is set below the second grading unit (8). The third grading unit (3) has a discharge port on one side. The third grading unit (3) is fixedly connected to the main body (1) of the crushing and grading machine. A protective component (9) is fixedly installed on the outer wall of the third grading unit (3). A drop chamber (4) is opened in the middle of the third grading unit (3). An auger blade (10) is installed inside the drop chamber (4). A drive motor (6) is fixedly installed on the front side of the main body (1). A linkage component (7) is installed on one side of the drive motor (6).

2. The crushed stone grading device for construction engineering according to claim 1, characterized in that: The linkage component (7) includes a drive sprocket (701), which is mounted on the output end of the drive motor (6) via a coupling. A driven sprocket (703) is provided above the drive sprocket (701). A first chain (702) is meshed with the outer wall of the driven sprocket (701) of the driven sprocket (703). The size of the driven sprocket (703) is larger than that of the drive sprocket (701). A drive bottom shaft (706) is fixedly installed in the middle of the driven sprocket (703). Several sets of auxiliary sprockets (704) are provided on the rear side of the driven sprocket (703). A second chain (705) is meshed with the outer wall of the auxiliary sprockets (704). Both ends of the drive bottom shaft (706) pass through the outer wall of the main body (1) of the crushing and grading machine and are rotatably connected to the outer wall of the main body (1) of the crushing and grading machine via bearings.

3. The crushed stone grading device for construction engineering according to claim 2, characterized in that: The linkage assembly (7) further includes a first drive wheel (707), which is fixedly mounted on the rear end of the drive shaft (706). A second drive wheel (709) is disposed directly below the first drive wheel (707). The second drive wheel (709) is meshed with the outer wall of the first drive wheel (707) by a first toothed belt (708). A drive bevel gear (710) is fixedly connected to the rear end of the second drive wheel (709). A driven bevel gear (711) is meshed with the outer wall of the drive bevel gear (710). The drive bevel gear (710) and the driven bevel gear (711) are connected to each other. The gears (711) are distributed at 90 degrees. The outer wall of the driven bevel gear (711) is fixedly connected to a fourth drive wheel (712). A third drive wheel (714) is provided on the horizontal side of the fourth drive wheel (712). The outer wall of the fourth drive wheel (712) and the third drive wheel (714) are meshed with a second toothed belt (713). A connecting shaft (715) is fixedly connected to one end of the third drive wheel (714) near the main body (1) of the crushing and grading machine. The other end of the connecting shaft (715) passes through the protective component (9) and is fixedly connected to the outer wall of the auger blade (10).

4. A crushed stone grading device for construction engineering according to claim 3, characterized in that: The first drive wheel (707), the second drive wheel (709) and the third drive wheel (714) have the same structure, and the first drive wheel (707) has a gear in the middle.

5. A crushed stone grading device for construction engineering according to claim 4, characterized in that: The first grading unit (2) includes a fixed frame (201) fixed in the middle of the main body (1) of the crushing and grading machine. Several support rollers (202) are rotatably installed in the middle of the fixed frame (201). The support rollers (202) are distributed in an inclined manner. There is a gap between two adjacent support rollers (202) for crushed stone to fall. Several rolling blocks (203) with triangular structure are distributed at equal intervals on the outer wall of the support rollers (202). A first feeding plate (204) is fixedly connected to the side of the fixed frame (201) away from the feeding frame (5).

6. A crushed stone grading device for construction engineering according to claim 5, characterized in that: Each of the support rollers (202) is fixedly connected to a drive shaft on the side near the drive motor (6). The drive shaft passes through the outer wall of the main body (1) of the stone crusher and is fixedly connected to the auxiliary sprocket (704).

7. A crushed stone grading device for construction engineering according to claim 6, characterized in that: The second grading unit (8) includes a support frame (801) installed at an angle. The support frame (801) is fixed inside the main body (1) of the crushing and grading machine. The support frame (801) is located directly below the support roller (202). A filter screen (803) is fixedly installed in the middle of the support frame (801). A second discharge plate (804) is fixedly installed on the side of the support frame (801) near the feed frame (5). A baffle plate (802) is fixedly installed on the other side of the support frame (801).

8. A crushed stone grading device for construction engineering according to claim 4, characterized in that: The protective component (9) includes a fixing plate (901), which is fixedly installed on the side of the third grading unit (3) away from the discharge port. A protective frame (902) is fixedly connected to the outside of the fixing plate (901). The fourth drive wheel (712), the second toothed belt (713) and the third drive wheel (714) are located inside the protective frame (902). A mounting frame (903) is provided on one side of the protective frame (902). The drive bevel gear (710) and the driven bevel gear (711) are rotatably installed inside the mounting frame (903).

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