Multi-stage stone crushing device for pavement construction

Abstract

The invention is applicable to the technical field of pavement construction, and provides a multi-stage stone crushing device for pavement construction, which comprises a base, a crushing mechanism, a plurality of sieve plates, a grading screening mechanism, a backflow circulating mechanism and an anti-blocking mechanism, the crushing mechanism is arranged at the top end of the base and crushes entering stones, and the sieve plates are arranged from top to bottom; the grading screening mechanisms are installed on the two sides of the screen plate so that separation and collection can be conveniently conducted through inertia of stone movement, the backflow circulation mechanism is connected with the crushing mechanism and used for feeding broken stone at the bottom into the crushing mechanism again, and the anti-blocking mechanism is in transmission connection with a second rotating shaft and cleans the screen plate during rotation. The device not only can realize multi-stage screening of crushed stones as required, but also can prevent the stones with different particle sizes from being mixed together in the screening process, has the advantage that the screened stones are consistent in particle size, and is matched with an anti-blocking mechanism cleaning hole to ensure that the stones are in a smooth state all the time, so that the treatment efficiency of crushed stones is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of road construction, and in particular relates to a multi-stage stone crushing device for road construction. Background Art

[0002] Gravel is an indispensable base material in road construction. In order to obtain gravel of suitable particles, a crusher is needed to crush large stones and perform multi-stage screening to classify them. The currently used multi-stage crushing device, when in use, stones are put into the crushing box through the feed port, and the crushing motor drives the two crushing rollers to rotate to crush the stones. The crushed stones fall on multiple filter plates for screening, and the screened stones are discharged outward along the discharge plate. At the same time, the vibration motor drives the turntable to rotate, and the connecting rod also drives the connecting block to rotate. Through the cooperation of the fixed rod and the fixed block, the crushing box is driven to move up and down through the elastic force of the telescopic rod and the spring to avoid blockage. After blockage or screening, pull the blocking plate to separate it from the crushing box. At this time, start the screening motor to drive the screw to rotate. When the moving plate moves to the right, it drives the moving rod to move, and then drives the push plate to rotate synchronously to push the stone out.

[0003] However, the above-mentioned multi-stage crushing device has the problem of mixed stone particles after screening during use, resulting in inconsistent stone size. At the same time, the screening device cannot be cleaned in real time. Stones and accumulated dust can easily clog the screen holes, affecting the normal working process. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a multi-stage stone crushing device for road construction, aiming to solve the problems existing in the above-mentioned background technology.

[0005] The embodiment of the present invention is implemented as follows: a multi-stage stone crushing device for road construction, including a base, a crushing mechanism, a screen plate, a grading screening mechanism, a reflux circulation mechanism and an anti-blocking mechanism: The crushing mechanism is arranged at the top of the base and is symmetrically arranged to crush the stones entering therein; The screen plates are provided in plurality from top to bottom, and are used to receive the stones dropped from the crushing mechanism and grade and screen them; The grading and screening mechanism is installed on both sides of the screen plate, and a support rod is installed on the top of the grading and screening mechanism. The end of the support rod is fixedly connected to the inclined cylinder in the crushing mechanism. There is also a gap between the grading and screening mechanism and the screen plate, so as to utilize the inertia of the movement of the stones for collection; The reflux circulation mechanism is arranged between the grading and screening mechanisms on both sides, and is also connected to the crushing mechanism. On the one hand, the reflux circulation mechanism is connected to the rotating shaft in the crushing mechanism through a gear set, and on the other hand, the reflux circulation mechanism sends the crushed stones at the bottom back into the crushing mechanism. The anti-blocking mechanism is slidably mounted on the sieve plate, and is transmission-connected to the second rotating shaft in the reflux circulation mechanism, and is used for automatically cleaning the sieve plate during the rotation of the second rotating shaft. The top end of the anti-blocking mechanism is also in contact with the crushing mechanism during the lifting process.

[0006] Preferably, the crushing mechanism comprises an inclined cylinder, a feed hopper, a rotating shaft 1, a crushing rod and a discharge hole; The inclined cylinder is symmetrically arranged on the top of the base, and a feed hopper is installed at one end of the inclined cylinder; The rotating shaft 1 is rotatably mounted inside the inclined cylinder, and a plurality of discharge holes are fixedly mounted on the rotating shaft 1, and the discharge holes crush the stones entering the inclined cylinder through the feed hopper when rotating with the rotating shaft 1; The bottom end of the inclined cylinder is evenly provided with a plurality of discharge holes with the same aperture.

[0007] Preferably, the sieve plates include sieve plate 1, sieve plate 2 and sieve plate 3; The sieve plate 1, sieve plate 2 and sieve plate 3 are arranged from top to bottom, and transition arcs are provided at the ends of the sieve plate 1, sieve plate 2 and sieve plate 3; The sieve plates 1, 2 and 3 are provided with holes 1, 2 and 3 in sequence, and the diameters of the holes 1, 2 and 3 are gradually reduced to facilitate filtering of particles and stones of different sizes.

[0008] Preferably, the grading and screening mechanism comprises a storage cabinet, a through hole, an L-shaped plate 1, an L-shaped plate 2, a receiving hopper and a vertical plate; The storage cabinet is fixedly mounted on the upper surface of the base, and a through hole is opened on the side of the storage cabinet corresponding to the end of the sieve plate; L-shaped plates 1 and 2 are installed at the corresponding through holes inside the storage cabinet to collect gravel; Among them, a receiving hopper is installed on the bottom surface of the lowest screen plate, and the end of the receiving hopper extends into the space formed by the storage cabinet and the vertical plates installed on the upper surface of the base.

[0009] Preferably, the sides of the storage cabinet, L-shaped plate 1, L-shaped plate 2 and vertical plate are all installed with inclined plates to facilitate the smooth discharge of the crushed stones after classification and screening.

[0010] Preferably, the reflux circulation mechanism comprises a V-shaped plate, a receiving plate, a feeding bucket, a feeding port, a discharging port, a second rotating shaft, a feeding plate and a reflux pipe; The V-shaped plate is arranged on the opposite side of the storage cabinet in the grading and screening mechanism, the receiving plate is arranged at the bottom end of the storage cabinet, and the bottom end of the receiving plate is fixedly connected with a feeding bucket; The bottom and top of the feeding barrel are respectively provided with a feeding port and a discharging port, and a rotating shaft 2 is rotatably installed in the feeding barrel, and a feeding plate is installed on the rotating shaft 2; A reflux pipe is installed at the outer side of the feeding barrel corresponding to the discharge port, and the reflux pipe is communicated with the inclined cylinder in the crushing mechanism.

[0011] Preferably, the anti-blocking mechanism comprises a disc, a guide rod, a movable frame, an elastic plate, a pin and a push rod; The disc is fixedly mounted on the bottom end of the second rotating shaft, a corrugated groove is arranged on the disc, and a guide rod is installed in the thin groove; The screen plate is provided with a hole for the guide rod to move, and the top end of the guide rod contacts the inclined cylinder when it is raised to the highest position; A movable frame is installed at the bottom of the sieve plate, a plurality of pins are evenly arranged on the movable frame, the movable frame is hinged to the side of the feed barrel in the reflux circulation mechanism, and an elastic plate is arranged between the movable frame and the feed barrel; A push rod is installed on the side of the guide rod, and the push rod abuts against the bottom end of the movable frame to push the movable frame to swing back and forth, so that the pin is embedded in the screen plate.

[0012] The multi-stage stone crushing device for road construction provided by the embodiment of the present invention can not only realize multi-stage screening of crushed stones according to needs, but also avoid mixing of stones of different particle sizes during the screening process, and has the advantage of uniform particle size of stones after screening, and has automatic collection and export functions. At the same time, when the stones are crushed and screened, an anti-blocking mechanism can be set up to clean the holes in real time to ensure that they are always in a smooth state, thereby improving the processing efficiency of crushed stones. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional structural diagram of a multi-stage stone crushing device for road construction provided by an embodiment of the present invention; Figure 2 A cross-sectional view of an inclined cylinder in a multi-stage stone crushing device for road construction provided by an embodiment of the present invention; Figure 3 for Figure 1 A partial enlarged view of the middle part; Figure 4 for Figure 1 A partial enlarged view of point B in the middle; Figure 5 A cross-sectional view of a feed bucket in a multi-stage stone crushing device for road construction provided by an embodiment of the present invention; Figure 6 A schematic structural diagram of an anti-blocking mechanism in a multi-stage stone crushing device for road construction provided by an embodiment of the present invention; In the attached drawings: 1-base; 2-inclined cylinder; 3-feed hopper; 4-rotating shaft 1; 5-crushing rod; 6-discharging hole; 7-sieve plate 1; 8-sieve plate 2; 9-sieve plate 3; 10-storage cabinet; 11-through hole; 12-L-type plate 1; 13-L-type plate 2; 14-receiving hopper; 15-vertical plate; 16-inclined plate; 17-V-plate; 18-receiving plate; 19-feeding barrel; 20-feeding port; 21-discharging port; 22-rotating shaft 2; 23-feeding plate; 24-reflux pipe; 25-disc; 26-guide rod; 27-movable frame; 28-elastic plate; 29-pin; 30-top rod; 31-support rod; 100-crushing mechanism; 200-grading and screening mechanism; 300-reflux circulation mechanism; 400-anti-blocking mechanism. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0016] like Figure 1-Figure 6 As shown, it is a structural diagram of a multi-stage stone crushing device for road construction provided by an embodiment of the present invention, comprising a base 1, a crushing mechanism 100, a screen plate, a grading and screening mechanism 200, a reflux circulation mechanism 300 and an anti-blocking mechanism 400: the crushing mechanism 100 is arranged at the top of the base 1 and is symmetrically arranged to crush the stones entering therein; the screen plate is provided with a plurality of grading and screening mechanisms from top to bottom for receiving the stones falling from the crushing mechanism 100 and grading and screening them; the grading and screening mechanism 200 is installed on both sides of the screen plate, and a support rod 31 is also installed at the top of the grading and screening mechanism 200, and the end of the support rod 31 is fixedly connected to the inclined cylinder 2 in the crushing mechanism 100, and the grading and screening mechanism 200 is also connected to the screen plate There is a gap between them so that the inertia of the movement of stones can be used for collection; the reflux circulation mechanism 300 is arranged between the grading and screening mechanisms 200 on both sides, and the reflux circulation mechanism 300 is also connected to the crushing mechanism 100. On the one hand, the reflux circulation mechanism 300 is connected to the rotating shaft 14 in the crushing mechanism 100 through a gear set, and on the other hand, the reflux circulation mechanism 300 sends the crushed stones at the bottom back into the crushing mechanism 100; the anti-blocking mechanism 400 is slidably installed on the screen plate, and the anti-blocking mechanism 400 is connected to the rotating shaft 22 in the reflux circulation mechanism 300 for automatically cleaning the screen plate during the rotation of the rotating shaft 22, and the top of the anti-blocking mechanism 400 is still in contact with the crushing mechanism 100 during the lifting.

[0017] The multi-stage stone crushing device for road construction provided by the present invention can not only realize multi-stage screening of crushed stones according to needs when in use, but also avoid mixing of stones of different particle sizes during the screening process, and has the advantage of uniform particle size of stones after screening, and has automatic collection and export functions. At the same time, when the stones are crushed and screened, the anti-blocking mechanism 400 can be set to clean the holes in real time to ensure that they are always in a smooth state, thereby improving the processing efficiency of crushed stones.

[0018] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, the crushing mechanism 100 includes an inclined cylinder 2, a feed hopper 3, a rotating shaft 4, a crushing rod 5 and a discharge hole 6; The inclined cylinder 2 is symmetrically arranged on the top of the base 1, and a feed hopper 3 is installed at one end of the inclined cylinder 2; The rotating shaft 1 4 is rotatably mounted inside the inclined cylinder 2, and a plurality of discharge holes 6 are fixedly mounted on the rotating shaft 1 4. The discharge holes 6 crush the stones entering the inclined cylinder 2 through the feed hopper 3 when rotating with the rotating shaft 1 4; The bottom end of the inclined cylinder 2 is evenly provided with a plurality of discharge holes 6 with the same aperture.

[0019] In one embodiment of the present invention, in addition to being connected to the rotating shaft 2 22 through the selection of a gear set, the rotating shaft 1 4 can also be driven by an independently arranged motor. When in use, stones are added to the inclined cylinder 2 along the feed hopper 3. The rotating shaft 1 4 drives the crushing rod 5 to rotate synchronously while rotating. The crushing rod 5 is set to crush the stones in the inclined cylinder 2, and the crushed stones are discharged outward through the discharge hole 6 set at the bottom end of the inclined cylinder 2.

[0020] like Figure 1 As shown, as another preferred embodiment of the present invention, the sieve plate includes sieve plate 1 7, sieve plate 2 8 and sieve plate 3 9; The sieve plate 1 7, sieve plate 2 8 and sieve plate 3 9 are arranged from top to bottom, and transition arcs are provided at the ends of the sieve plate 1 7, sieve plate 2 8 and sieve plate 3 9; The sieve plate 1 7 , the sieve plate 2 8 and the sieve plate 3 9 are provided with hole 1 , hole 2 and hole 3 in sequence, and the diameters of hole 1 , hole 2 and hole 3 are gradually reduced to facilitate filtering of different particle stone sizes.

[0021] In one embodiment of the present invention, the crushed stones first fall on the screen plate 1 7 and are screened by hole 1. The stone particles larger than hole 1 move along the surface of the screen plate 1 7, and the stone particles smaller than hole 1 move downward and fall on the screen plate 2 8. The stone particles larger than hole 2 move along the screen plate 2 8, and the stone particles smaller than hole 2 move downward and fall on the screen plate 3 9. The stone particles larger than hole 3 move along the surface of the screen plate 3 9, and the stone particles smaller than hole 3 fall downward.

[0022] like Figure 1 As shown, as another preferred embodiment of the present invention, the grading and screening mechanism 200 includes a storage cabinet 10, a through hole 11, an L-shaped plate 12, an L-shaped plate 2 13, a receiving hopper 14 and a vertical plate 15; The storage cabinet 10 is fixedly mounted on the upper surface of the base 1, and a through hole 11 is opened on the side of the storage cabinet 10 corresponding to the end of the sieve plate; The storage cabinet 10 is also provided with an L-shaped plate 12 and an L-shaped plate 2 13 at the locations corresponding to the through holes 11 for collecting gravel; A receiving hopper 14 is installed on the bottom surface of the lowest sieve plate, and the end of the receiving hopper 14 extends into the space formed by the storage cabinet 10 and the vertical plate 15 installed on the upper surface of the base 1.

[0023] In one embodiment of the present invention, the sides of the storage cabinet 10, L-shaped plate 1 12, L-shaped plate 2 13 and vertical plate 15 are all installed with inclined plates 16 to facilitate the smooth discharge of crushed stones after graded screening; when in use, when the stone particles on the sieve plate 1 7, sieve plate 2 8 and sieve plate 3 9 move to the end, they pass through the through holes 11 set on the storage cabinet 10 under the action of inertia, and fall into the L-shaped plate 1 12, L-shaped plate 2 13 and storage cabinet 10 in turn, and the particles move along the chamber between the storage cabinet 10, L-shaped plate 1 12, L-shaped plate 2 13 and the receiving hopper 14, while the stone particles falling through the sieve plate 3 9 fall into the receiving hopper 14 and finally stay in the space between the storage cabinet 10 and the vertical plate 15, and the stones after graded screening are discharged outward along the inclined plate 16.

[0024] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, as another preferred embodiment of the present invention, the reflux circulation mechanism 300 includes a V-shaped plate 17, a receiving plate 18, a feeding bucket 19, a feed port 20, a discharge port 21, a second rotating shaft 22, a feeding plate 23 and a reflux pipe 24; The V-shaped plate 17 is arranged at the opposite side of the storage cabinet 10 in the grading and screening mechanism 200, and the receiving plate 18 is arranged at the bottom end of the storage cabinet 10, and the bottom end of the receiving plate 18 is fixedly connected to the feeding bucket 19; The bottom and top of the feeding barrel 19 are respectively provided with a feeding port 20 and a discharging port 21. A second rotating shaft 22 is rotatably installed in the feeding barrel 19, and a feeding plate 23 is installed on the second rotating shaft 22. A return pipe 24 is installed on the outer side of the feeding barrel 19 corresponding to the discharge port 21 , and the return pipe 24 is communicated with the inclined cylinder 2 in the crushing mechanism 100 .

[0025] In one embodiment of the present invention, the stone particles that do not pass through the through hole 11 fall on the V-plate 17 on the outside of the storage cabinet 10 and are diverted along the V-plate 17. The diverted stones fall on the receiving plate 18 under the action of gravity and move along the surface of the receiving plate 18, and finally pass through the feed port 20 into the feed barrel 19. The rotating shaft 22 rotates under the drive of the top motor, and the rotating shaft 22 drives the feeding plate 23 to move to transport the bottom stones upward. When transported to the discharge port 21, they are re-introduced into the inclined cylinder 2 along the reflux pipe 24, thereby realizing the circulation of the residual stone particles.

[0026] like Figure 1 , Figure 4 and Figure 6 As shown in FIG. 4 , as another preferred embodiment of the present invention, the anti-blocking mechanism 400 includes a disc 25, a guide rod 26, a movable frame 27, an elastic plate 28, a pin 29 and a push rod 30; The disc 25 is fixedly mounted on the bottom end of the second rotating shaft 22, and a corrugated groove is provided on the disc 25, and a guide rod 26 is installed in the thin groove; The screen plate is provided with a hole for the guide rod 26 to move, and the top end of the guide rod 26 contacts the inclined cylinder 2 when it is raised to the highest position; A movable frame 27 is installed at the bottom of the sieve plate, and a plurality of pins 29 are evenly arranged on the movable frame 27. The movable frame 27 is hinged to the side of the feed barrel 19 in the reflux circulation mechanism 300, and an elastic plate 28 is arranged between the movable frame 27 and the feed barrel 19. A push rod 30 is installed on the side of the guide rod 26, and the push rod 30 abuts against the bottom end of the movable frame 27 to facilitate pushing the movable frame 27 to swing back and forth, so that the pin 29 is embedded in the screen plate.

[0027] In one embodiment of the present invention, the rotating shaft 22 drives the disc 25 to rotate synchronously when rotating. When the disc 25 rotates, the bottom end of the guide rod 26 slides continuously along the surface of the corrugated groove. At the same time, the guide rod 26 also slides in the height direction along the receiving plate 18 and the screen plate. On the one hand, the top end of the guide rod 26 hits the inclined cylinder 2 to prevent stones from being blocked in the discharge hole 6. On the other hand, the guide rod 26 pushes the movable frame 27 to swing along the feed barrel 19 through the push rod 30. The elastic plate 28 is elastically deformed under the force. The movable frame 27 pushes the pin 29 to embed into the hole one, hole two and hole three, while satisfying the screening of the screen plate one 7, the screen plate two 8 and the screen plate three 9, preventing stones from being stuck in the holes set thereon.

[0028] To sum up, when in use, stones are added into the inclined cylinder 2 along the feed hopper 3, and the rotating shaft 1 4 drives the crushing rod 5 to rotate synchronously while rotating, and the crushing rod 5 is set to crush the stones in the inclined cylinder 2, and the crushed stones are discharged outward through the discharge hole 6 set at the bottom end of the inclined cylinder 2, and the crushed stones first fall on the sieve plate 1 7 and are screened by the hole 1. The stone particles larger than the hole 1 move along the surface of the sieve plate 1 7, and the stone particles smaller than the hole 1 move downward and fall on the sieve plate 2 8, and the stone particles larger than the hole 2 move along the sieve plate 2 8, and the stone particles smaller than the hole 2 move downward and fall on the sieve plate 3 9, and the stone particles larger than the hole 3 move along the surface of the sieve plate 3 9, and the stone particles smaller than the hole 3 fall downward, and the sieve plates 1 7, sieve plates 2 8 and When the stone particles on the sieve plate three 9 move to the end, they pass through the through hole 11 set on the storage cabinet 10 under the action of inertia, and fall into the L-shaped plate one 12, the L-shaped plate two 13 and the storage cabinet 10 in turn. The particles move along the chamber between the storage cabinet 10, the L-shaped plate one 12, the L-shaped plate two 13 and the receiving hopper 14, and the stone particles falling through the sieve plate three 9 fall into the receiving hopper 14, and finally stay in the space between the storage cabinet 10 and the vertical plate 15. After graded screening, the stones are guided outward along the inclined plate 16. The stone particles that do not pass through the through hole 11 fall on the V-shaped plate 17 outside the storage cabinet 10 and are diverted along the V-shaped plate 17. The diverted stones fall on the receiving plate under the action of gravity. 18, and moves along the surface of the receiving plate 18, and finally passes through the feed port 20 into the feed barrel 19. The second rotating shaft 22 rotates under the drive of the top motor, and the second rotating shaft 22 drives the feeding plate 23 to move to transport the bottom stones upward, and when they are transported to the discharge port 21, they are re-introduced into the inclined cylinder 2 along the return pipe 24, so as to realize the circulation of the residual stone particles. At the same time, the second rotating shaft 22 drives the disc 25 to rotate synchronously when rotating. When the disc 25 rotates, the bottom end of the guide rod 26 continuously slides along the surface of the corrugated groove, and the guide rod 26 also slides in the height direction along the receiving plate 18 and the screen plate. On the one hand, the top end of the guide rod 26 knocks the inclined cylinder 2 to prevent the stones from being blocked in In the discharge hole 6, on the other hand, the guide rod 26 pushes the movable frame 27 to swing along the feed barrel 19 through the push rod 30, and the elastic plate 28 is elastically deformed under the force, and the movable frame 27 pushes the pin 29 to embed into the hole one, hole two and hole three to prevent stones from clogging them. This stone crushing device can not only realize multi-stage screening of crushed stones according to needs, but also avoid mixing of stones of different particle sizes during the screening process. It has the advantage of consistent particle size of stones after screening, and has automatic collection and export functions. At the same time, when the stones are crushed and screened, the anti-blocking mechanism 400 can be set to clean the holes in real time to ensure that they are always in a smooth state, thereby improving the processing efficiency of crushed stones.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-stage stone crushing device for road construction, characterized in that: Including base, crushing mechanism, screen plate, grading and screening mechanism, reflux circulation mechanism and anti-blocking mechanism: The crushing mechanism is arranged at the top of the base and is symmetrically arranged to crush the stones entering therein; The screen plates are provided in plurality from top to bottom, and are used to receive the stones dropped from the crushing mechanism and grade and screen them; The grading and screening mechanism is installed on both sides of the screen plate, and a support rod is installed on the top of the grading and screening mechanism. The end of the support rod is fixedly connected to the inclined cylinder in the crushing mechanism. There is also a gap between the grading and screening mechanism and the screen plate, so as to utilize the inertia of the movement of the stones for collection; The reflux circulation mechanism is arranged between the grading and screening mechanisms on both sides, and is also connected to the crushing mechanism. On the one hand, the reflux circulation mechanism is connected to the rotating shaft in the crushing mechanism through a gear set, and on the other hand, the reflux circulation mechanism sends the crushed stones at the bottom back into the crushing mechanism. The anti-blocking mechanism is slidably mounted on the sieve plate, and is transmission-connected to the second rotating shaft in the reflux circulation mechanism, and is used for automatically cleaning the sieve plate during the rotation of the second rotating shaft. The top end of the anti-blocking mechanism is also in contact with the crushing mechanism during the lifting process.

2. A multi-stage stone crushing device for road construction according to claim 1, characterized in that: The crushing mechanism includes an inclined cylinder, a feed hopper, a rotating shaft, a crushing rod and a discharge hole; The inclined cylinder is symmetrically arranged on the top of the base, and a feed hopper is installed at one end of the inclined cylinder; The rotating shaft 1 is rotatably mounted inside the inclined cylinder, and a plurality of discharge holes are fixedly mounted on the rotating shaft 1, and the discharge holes crush the stones entering the inclined cylinder through the feed hopper when rotating with the rotating shaft 1; The bottom end of the inclined cylinder is evenly provided with a plurality of discharge holes with the same aperture.

3. A multi-stage stone crushing device for road construction according to claim 1, characterized in that: The sieve plates include sieve plate 1, sieve plate 2 and sieve plate 3; The sieve plate 1, sieve plate 2 and sieve plate 3 are arranged from top to bottom, and transition arcs are provided at the ends of the sieve plate 1, sieve plate 2 and sieve plate 3; The sieve plates 1, 2 and 3 are provided with holes 1, 2 and 3 in sequence, and the diameters of the holes 1, 2 and 3 are gradually reduced to facilitate filtering of particles and stones of different sizes.

4. A multi-stage stone crushing device for road construction according to claim 1, characterized in that: The grading and screening mechanism comprises a storage cabinet, a through hole, an L-shaped plate 1, an L-shaped plate 2, a receiving hopper and a vertical plate; The storage cabinet is fixedly mounted on the upper surface of the base, and a through hole is opened on the side of the storage cabinet corresponding to the end of the sieve plate; L-shaped plates 1 and 2 are installed at the corresponding through holes inside the storage cabinet to collect gravel; Among them, a receiving hopper is installed on the bottom surface of the lowest screen plate, and the end of the receiving hopper extends into the space formed by the storage cabinet and the vertical plates installed on the upper surface of the base.

5. A multi-stage stone crushing device for road construction according to claim 4, characterized in that: The sides of the storage cabinet, the first L-shaped plate, the second L-shaped plate and the vertical plate are all equipped with inclined plates, so as to facilitate the smooth discharge of the crushed stones after classification and screening.

6. A multi-stage stone crushing device for road construction according to claim 1, characterized in that: The reflux circulation mechanism includes a V-shaped plate, a material receiving plate, a material delivery barrel, a material inlet, a material outlet, a second rotating shaft, a material feeding plate and a reflux pipe; The V-shaped plate is arranged on the opposite side of the storage cabinet in the grading and screening mechanism, the receiving plate is arranged at the bottom end of the storage cabinet, and the bottom end of the receiving plate is fixedly connected with a feeding bucket; The bottom and top of the feeding barrel are respectively provided with a feeding port and a discharging port, and a rotating shaft 2 is rotatably installed in the feeding barrel, and a feeding plate is installed on the rotating shaft 2; A reflux pipe is installed at the outer side of the feeding barrel corresponding to the discharge port, and the reflux pipe is communicated with the inclined cylinder in the crushing mechanism.

7. A multi-stage stone crushing device for road construction according to claim 1, characterized in that: The anti-blocking mechanism includes a disc, a guide rod, a movable frame, an elastic plate, a pin and a push rod; The disc is fixedly mounted on the bottom end of the second rotating shaft, a corrugated groove is arranged on the disc, and a guide rod is installed in the thin groove; The screen plate is provided with a hole for the guide rod to move, and the top end of the guide rod contacts the inclined cylinder when it is raised to the highest position; A movable frame is installed at the bottom of the sieve plate, a plurality of pins are evenly arranged on the movable frame, the movable frame is hinged to the side of the feed barrel in the reflux circulation mechanism, and an elastic plate is arranged between the movable frame and the feed barrel; A push rod is installed on the side of the guide rod, and the push rod abuts against the bottom end of the movable frame to push the movable frame to swing back and forth, so that the pin is embedded in the screen plate.

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