Grading stone crushing equipment for high-safety municipal road surface construction

Abstract

The utility model belongs to the technical field of road surface construction equipment, particularly relates to high-safety graded stone crushing equipment for municipal road surface construction, and solves the problem of low safety. The high-safety graded stone crushing equipment for municipal road surface construction comprises a crushing box, a feeding opening is formed in the upper end of the crushing box, a crushing mechanism is arranged below the feeding opening, a protection structure used for preventing broken stone from splashing out is arranged between the crushing mechanism and the feeding opening, and a graded discharging mechanism is arranged below the crushing mechanism. The effect that flying stones in the stone crushing process can be effectively prevented from being splashed out is achieved, and high safety is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of road construction equipment, in particular to a high-safety graded stone crushing equipment for municipal road construction. Background Art

[0002] The stone crushing equipment used in municipal engineering usually refers to mechanical equipment used to crush large rocks or concrete to produce small stones or sand and gravel suitable for road construction, foundation paving and other purposes. This type of equipment is very important in road construction and maintenance, urban infrastructure construction, etc. It mainly includes jaw crushers, impact crushers, cone crushers, etc., and can be selected according to specific needs.

[0003] However, in the current existing technology, some stone crushing equipment often lacks a protective structure to prevent flying stones from splashing during the crushing process. The flying stones are like bullets, which greatly threaten the personal safety of users and have low safety. Utility Model Content

[0004] The purpose of the utility model is to address the above-mentioned problems existing in the prior art and to propose a high-safety graded stone crushing equipment for municipal road construction.

[0005] In order to achieve the purpose of innovation of this utility model, the following technical solutions can be used:

[0006] A high-safety graded stone crushing equipment for municipal road construction includes a crushing box, a feeding port is provided at the upper end of the crushing box, a crushing mechanism is provided below the feeding port, a protective structure for preventing stone from splashing is provided between the crushing mechanism and the feeding port, and a graded discharging mechanism is provided below the crushing mechanism.

[0007] The utility model is mainly used for crushing and grading stones during road construction. The crushing mechanism is used to crush large stones into smaller particles. The grading discharging mechanism is located below the crushing mechanism and is used to classify the crushed stones according to different particle sizes to ensure that the final crushed stones meet the specified size requirements. The protective structure is arranged between the crushing mechanism and the feeding port to prevent the crushed stones generated during the crushing process from splashing out and ensure the safety of the operators.

[0008] In the above-mentioned high-safety graded stone crushing equipment for municipal road construction, the protective structure includes a protective plate with an inverted V-shaped cross-section, and the orthographic projection surface of the protective plate completely covers the feeding port.

[0009] The protective plate is in an inverted V shape, with two inclined surfaces extending downward from the outer ends, which are used to guide the material into the crushing area smoothly. When viewed from a direction perpendicular to the ground, the projected area of ​​the protective plate completely covers the feed port, which can effectively prevent flying stones generated by crushing from splashing out of the feed port.

[0010] In the above-mentioned high-safety graded stone crushing equipment for municipal road construction, the crushing mechanism includes a double crushing roller assembly, and a material guide boss is provided on the inner side wall of the crushing box between the double crushing roller assembly and the protective plate. The material guide boss and the protective plate are axially consistent and have a triangular cross-section. A broken-line material discharge channel is formed between the material guide boss, the protective plate and the feeding port.

[0011] The crushing mechanism utilizes a dual crushing roller assembly to achieve rock crushing. This is prior art and will not be elaborated on. The guide boss guides material entering from the feed port between the dual crushing rollers, ensuring smooth passage to the crushing zone without clogging. The guide boss, protective plate, and feed port together form a zigzag-shaped discharge channel. This helps the material move along a predetermined path, reducing disordered movement and improving crushing efficiency. Furthermore, by controlling the material's path, it effectively prevents the splashing of gravel during the crushing process, improving safety. Furthermore, proper material guidance reduces wear on the crushing chamber's inner walls.

[0012] In the above-mentioned high-safety graded stone crushing equipment for municipal road construction, an inspection window is provided on the side wall of the crushing box between the protection plate and the crushing mechanism. The inspection window is set at one end or both ends of the protection plate, and a switch door is provided on the inspection window.

[0013] An inspection window is provided at one or both ends of the protective plate to facilitate the staff to carry out necessary inspection and maintenance work inside the crushing box. A switch door is provided on the inspection window. When no maintenance is required, the switch door can be closed to maintain the closedness of the equipment, thereby not affecting the normal operation and safety of the equipment. The specific installation method of the switch door can be hinged or sliding. This is existing technology and will not be further expanded.

[0014] In the above-mentioned high-safety graded gravel equipment for municipal road construction, a first negative pressure suction port is provided under the protective plate, the first negative pressure suction port is fixed on the protective plate and connected to the negative pressure dust suction device, and a protective mesh plate is provided under the first negative pressure suction port, the protective mesh plate is fixedly connected to the lower side of the protective plate.

[0015] The first negative pressure suction port uses negative pressure to remove dust generated during the crushing process and collects it in the negative pressure dust collection device, preventing dust from leaking out of the feeding port and polluting the environment or affecting the health of operators. A protective screen prevents larger gravel or other foreign matter from being sucked out of the first negative pressure suction port, while also preventing flying rocks from impacting and damaging the suction port. The negative pressure dust collection device is equipped with a dust collection assembly, which is prior art and will not be further elaborated.

[0016] In the above-mentioned high-safety graded stone crushing equipment for municipal road construction, the graded discharging mechanism includes at least two groups of sub-filters vertically distributed below the crushing mechanism for filtering out small-volume stones. The sub-filters are inclined downward, and adjacent sub-filters are respectively fixed on two opposite side surfaces of the crushing box. A small stone discharging structure is provided below each sub-filter, and a receiving box for receiving large-volume stones after filtration is provided at the bottom of the crushing box.

[0017] The sub-filter is set on the inner wall of the crushing box, and the inner ends are tilted downward. The crushed material rolls down from the sub-filter. During the rolling process, smaller stones fall into the small stone discharging structure below, and larger stones continue to move downward and finally fall into the receiving box below, realizing the classified output of stones of different sizes. There are multiple groups of sub-filters, and the adjacent sub-filters are relatively arranged to improve the effectiveness of filtration.

[0018] In the above-mentioned high-safety graded gravel equipment for municipal road construction, the small stone discharging structure includes a discharging plate with a U-shaped cross-section, the inner end of the discharging plate is rotatably connected to the inner wall of the crushing box, and the discharging plate has a horizontal receiving position and a discharging position with the outer end tilted downward. The side wall of the crushing box is provided with a limiting structure for keeping the discharging plate at the discharging position, and the side wall of the crushing box below the limiting structure is provided with a discharge port that docks with the discharge plate when the discharge plate rotates to the discharging position.

[0019] The discharge plate is U-shaped, that is, side baffles are vertically arranged on both sides. The discharge plate is rotatably connected to the crushing box. When it is rotated to the horizontal position, the discharge plate is located on the material receiving position, and its outer end is blocked by the side wall of the crushing box. After rotating downward to the discharge position, the lower end of the discharge plate is connected to the discharge port, and small stones can be discharged from the discharge port, realizing the switch control of the discharge, and the structure is simple.

[0020] In the above-mentioned high-safety graded gravel crushing equipment for municipal road construction, the limiting structure includes a limiting screw screwed on a limiting screw hole, and there are at least two limiting screw holes, which are evenly distributed horizontally on the side wall of the crushing box. The outer end of the discharge plate rests on the inner end of the limiting screw, and vertical baffles are arranged across both sides of the inner wall of the crushing box at the inner end of the discharge plate, and the upper end of the vertical baffle is connected to the lower end of the filter screen.

[0021] The limiting structure specifically realizes limiting through a limiting screw. The limiting screw is screwed on the side wall of the crushing box, and its inner end extends into the box. When the discharge plate is in the receiving position and wants to be maintained, the limiting screw continues to be screwed in until the inner end enters directly under the discharge plate. The discharge plate is placed on the limiting screw to maintain it. When it needs to be rotated downward, the limit can be released by unscrewing the limiting screw. Of course, a structure such as a toggle lever can also be set at the outer end of the discharge plate to control the up and down rotation of the discharge plate. This is common knowledge and will not be elaborated. A vertical baffle is provided at the inner end of the discharge plate. On the one hand, the baffle can prevent the gravel filtered from the sub-filter from entering the discharge plate from the side. On the other hand, it is also used to block the rear end when the discharge plate maintains the receiving position, thereby ensuring a good receiving effect.

[0022] In the above-mentioned high-safety graded gravel equipment for municipal road construction, a guide plate is obliquely arranged on the outer side of the discharge port, the upper part of the guide plate is hinged on the side wall of the crushing box, and the overlapping part at the upper end extends into the crushing box, and the outer end of the discharge plate is overlapped on the overlapping part when it is in the discharge position, and the bottom surface of the guide plate is hinged with a support rod, and an abutment boss is provided on the outer side wall of the crushing box, and the free end of the support rod abuts against the abutment boss.

[0023] The guide plate is hingedly connected, and its support and fixation in a triangular form are achieved by the support rod below resting on the abutment boss. It can be folded up when not needed for easy transportation and storage. The hinge position is located between the upper end and the middle part of the guide plate. When it is rotated and flipped up, the overlapping part on the upper end of the guide plate rotates into the box. The overlapping part is used for overlapping the guide plate to ensure stable docking between the discharge plate and the guide plate, thereby improving the smoothness of the discharge.

[0024] In the above-mentioned high-safety graded stone crushing equipment for municipal road construction, a second negative pressure suction port is provided above the discharge port, the second negative pressure suction port is fixed on the outer wall of the crushing box and is connected to the negative pressure dust suction device.

[0025] A second negative pressure suction port is provided on the discharge port to suck out the dust during discharge and collect it in a negative pressure dust collection device to protect the environment and the health of the operator. The negative pressure dust collection device is provided with a dust collection component, which is prior art and will not be further elaborated.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. The protective structure is set between the crushing mechanism and the feeding port to prevent the gravel generated during the crushing process from splashing out and ensure the safety of the operator.

[0028] 2. The protective plate is in an inverted V shape, with two inclined surfaces extending downward from the outer ends, which are used to guide the material into the crushing area smoothly. When viewed from a direction perpendicular to the ground, the projected area of ​​the protective plate completely covers the feeding port, which can effectively prevent the flying stones generated by crushing from splashing out from the feeding port.

[0029] 3. The material discharge channel formed by the material guide boss, the protective plate and the feeding port is in a broken line shape due to the existence of the material guide boss. On the one hand, it can help the material move along the predetermined path, reduce the disordered movement of the material, and improve the crushing efficiency. In addition, by controlling the falling path of the material, it can effectively prevent the gravel generated during the crushing process from splashing, improve safety, and reasonable material guidance can reduce the wear of the material on the inner wall of the crushing box.

[0030] 4. The inspection window is set at one or both ends of the protective plate to facilitate the staff to carry out necessary inspection and maintenance work inside the crushing box. The inspection window is equipped with a switch door. When no maintenance is required, the switch door can be closed to keep the equipment closed, so as not to affect the normal operation and safety of the equipment.

[0031] 5. The first negative pressure suction port and the second negative pressure suction port are used to suck out dust and collect it in the negative pressure dust collection device to protect the environment and the health of the operators.

[0032] 6. The discharge plate can be kept horizontal by simply placing it on the limit screws. When it needs to be rotated downward, the limit screws can be unscrewed to release the limit. The structure is simple. The vertical baffle prevents the crushed stone filtered by the sub-filter from entering the discharge plate from the side. A channel for the filtered material to fall is formed between the vertical baffle and the side wall of the crushing box. It also serves to block the rear end of the discharge plate when it maintains the material receiving position, ensuring a good material receiving effect.

[0033] 7. The guide plate is hingedly connected, and the support rod below is pressed against the abutting boss to achieve triangular support and fixation. It can be folded up when not needed for easy transportation and storage. When it is rotated and flipped up, the overlapping part on the upper end of the guide plate rotates into the box. The overlapping part is used for overlapping the guide plate to ensure stable docking between the discharge plate and the guide plate, thereby improving the smoothness of the discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure provided by the utility model;

[0035] Figure 2 yes Figure 1 A magnified view of the details at center A;

[0036] Figure 3 This is a schematic diagram of the discharge plate provided by the present invention when it is in the material receiving position.

[0037] In the figure, there are a crushing box 1, a feeding port 11, an inspection window 12, a switch door 13, a discharge port 14, a crushing mechanism 2, a double crushing roller assembly 21, a material guide boss 22, a discharge channel 23, a protective structure 3, a protective plate 31, a first negative pressure suction port 32, a protective mesh plate 33, a graded discharge mechanism 4, a filter screen 41, a small stone discharge structure 42, a receiving box 43, a discharge plate 44, a limiting structure 45, a limiting screw 46, a vertical baffle 47, a guide plate 48, a support rod 49, abutting boss 50, a second negative pressure suction port 51, a guide platform 52, a limiting screw hole 53, a lap joint 54, and a toggle rod 55. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] Specific implementation examples Figure 1-3 As shown, the high-safety graded stone crushing equipment for municipal road construction includes a crushing box 1, a feeding port 11 is provided at the upper end of the crushing box 1, a crushing mechanism 2 is provided below the feeding port 11, a protective structure 3 for preventing gravel from splashing is provided between the crushing mechanism 2 and the feeding port 11, and a graded discharge mechanism 4 is provided below the crushing mechanism 2.

[0040] Specifically, the utility model is mainly used for crushing and grading stones during road construction, wherein the crushing mechanism 2 is used to crush large stones into smaller particles, and the grading discharge mechanism 4 is located below the crushing mechanism 2, and is used to classify the crushed stones according to different particle sizes to ensure that the final crushed stones meet the specified size requirements. The protective structure 3 is arranged between the crushing mechanism and the feeding port 11 to prevent the crushed stones generated during the crushing process from splashing out and ensure the safety of the operator.

[0041] like Figure 1 As shown, the protective structure 3 includes a protective plate 31 with an inverted V-shaped cross-section. The orthographic projection of the protective plate 31 completely covers the feed port 11. The crushing mechanism 2 includes a dual crushing roller assembly 21. A material guide boss 22 is provided on the inner sidewall of the crushing box 1 between the dual crushing roller assembly 21 and the protective plate 31. The material guide boss 22 and the protective plate 31 are axially aligned and have a triangular cross-section. A broken-line material discharge channel 23 is formed between the material guide boss 22, the protective plate 31, and the feed port 11. A first negative pressure suction port 32 is provided below the protective plate 31. The first negative pressure suction port 32 is fixed to the protective plate 31 and connected to the negative pressure dust collection device. A protective screen 33 is provided below the first negative pressure suction port 32 and is fixedly connected to the lower side of the protective plate 31.

[0042] Specifically, the protective plate 31 is in an inverted V-shape, with two downwardly extending, inclined surfaces at its outer ends. This serves to guide material smoothly into the crushing zone. When viewed perpendicular to the ground, the projected area of ​​the protective plate 31 completely covers the feed opening 11, effectively preventing flying rocks from scattering from the feed opening 11. The crushing mechanism 2 specifically utilizes a dual crushing roller assembly 21 to achieve rock crushing. The guide boss 22 guides material entering from the feed opening 11 between the dual crushing rollers 21, ensuring smooth passage to the crushing zone without clogging. The material discharge channel 23, formed by the guide boss 22, the protective plate 31, and the feed opening 11, exhibits a zigzag shape due to the presence of the guide boss 22. This helps the material move along a predetermined path, reducing disordered movement and improving crushing efficiency. Furthermore, by controlling the material's path of descent, it effectively prevents the scattering of rock fragments generated during the crushing process, enhancing safety. Furthermore, proper material guidance reduces wear on the inner walls of the crushing chamber 1. The first negative pressure suction port 32 uses negative pressure to remove dust generated during the crushing process and collects it in the negative pressure dust collection device, preventing dust from leaking out of the feeding port 11 and polluting the environment or affecting the health of operators. The protective screen 33 is used to prevent larger gravel or other foreign matter from being sucked out of the first negative pressure suction port 32, and also to prevent flying rocks from impacting and damaging the suction port.

[0043] As an optimization of this embodiment, an inspection window 12 is provided on the side wall of the crushing box 1 between the protection plate 31 and the crushing mechanism 2 . The inspection window 12 is arranged at both ends of the protection plate 31 , and a switch door 13 is provided on the inspection window 12 .

[0044] Specifically, the inspection window 12 is set at one end or both ends of the protective plate 31 to facilitate the staff to perform necessary inspections and maintenance work on the inside of the crushing box 1. The inspection window 12 is set at both ends of the protective plate 31 and is equipped with a hinged switch door 13 to facilitate internal inspection and maintenance while ensuring the closedness and safety of the equipment.

[0045] like Figure 1 、 2As shown in Figures 3 and 4, the graded discharge mechanism 4 includes at least two groups of sub-filters 41 vertically distributed below the crushing mechanism 2 for filtering out small-volume rocks. The sub-filters 41 are tilted downward, and adjacent sub-filters 41 are fixed to two opposite side surfaces of the crushing box 1. A small-stone discharge structure 42 is provided below each sub-filter 41. A receiving box 43 is provided at the bottom of the crushing box 1 for receiving large-volume rocks after filtration. The small-stone discharge structure 42 includes a discharge plate 44 with a U-shaped cross-section. The inner end of the discharge plate 44 is rotatably connected to the inner wall of the crushing box 1. The discharge plate 44 has a horizontal receiving position and a downward-tilted discharge position at the outer end. A limiting structure 45 is provided on the side wall of the crushing box 1 for maintaining the discharge plate 44 at the discharge position. A discharge port 14 is provided on the side wall of the crushing box 1 below the limiting structure 45, which docks with the discharge plate 44 when it rotates to the discharge position. The limiting structure 45 includes a limiting screw 46 screwed into a limiting screw hole 53. There are at least two limiting screw holes 53, evenly distributed horizontally on the side wall of the crushing box 1. The outer end of the discharge plate 44 rests on the inner end of the limiting screw 46. Vertical baffles 47 are installed across the inner wall of the crushing box 1 on both sides of the inner end of the discharge plate 44. The upper end of the vertical baffle 47 is connected to the lower end of the sub-filter 41. A second negative pressure suction port 51 is provided above the discharge port 14. The second negative pressure suction port 51 is fixed to the outer wall of the crushing box 1 and connected to the negative pressure dust collection device.

[0046] Specifically, the sub-filter 41 is disposed on the inner side wall of the crushing box 1, and the inner ends thereof are tilted downward. The crushed material rolls down from the sub-filter 41. During the rolling process, smaller stones fall into the small stone discharging structure 42 below, while larger stones continue to move downward and eventually fall into the receiving box 43 below, thereby achieving classified output of stones of different sizes. Multiple groups of sub-filters 41 are provided, and adjacent sub-filters 41 are arranged in a relative arrangement to improve the effectiveness of filtration. The discharge plate 44 is U-shaped, i.e., side baffles are vertically disposed on both sides. The discharge plate 44 is rotatably connected to the crushing box 1. When rotated to a horizontal position, the discharge plate 44 is located at the receiving position, and its outer end is blocked by the side wall of the crushing box 1. After rotating downward to the discharge position, the lower end of the discharge plate 44 docks with the discharge port 14, and small stones can be discharged from the discharge port 14, achieving on-off control of the discharge, and having a simple structure. The limiting structure 45 is specifically limited by a limiting screw 46. The limiting screw 46 is screwed on the side wall of the crushing box 1, and its inner end extends into the box. When the discharge plate 44 is in the receiving position and wants to be maintained, the limiting screw 46 is continuously screwed in until the inner end enters directly below the discharge plate 44. The discharge plate 44 is placed on the limiting screw 46 to be maintained. When it needs to be rotated downward, the limit can be released by screwing out the limiting screw 46. Of course, a toggle rod 55 is also provided at the outer end of the discharge plate 44, and a vertical baffle 47 is provided at the inner end of the discharge plate 44. On the one hand, the baffle can prevent the gravel filtered by the sub-filter 41 from entering the discharge plate 44 from the side. On the other hand, it is also used to block the rear end when the discharge plate 44 maintains the receiving position, thereby ensuring a good receiving effect. A second negative pressure suction port 51 is provided on the discharge port 14 for sucking out dust when the material is discharged from the discharge port 14 and collecting the dust in a negative pressure dust collection device to protect the environment and the health of the operator.

[0047] Furthermore, a guide platform 52 is provided on the side wall of the crushing box 1 near the lower end of the uppermost filter screen 41 . The guide platform 52 is located above the vertical baffle 47 and is used to guide the crushed stones onto the filter screen 41 .

[0048] As an optimization of this embodiment, a guide plate 48 is obliquely provided on the outer side of the discharge port 14. The upper part of the guide plate 48 is hinged to the side wall of the crushing box 1, and the overlapping part 54 at the upper end extends into the crushing box 1. When the discharge plate 44 is in the discharge position, the outer end is overlapped on the overlapping part 54. A support rod 49 is hinged to the bottom surface of the guide plate 48, and an abutment boss 50 is provided on the outer side wall of the crushing box 1. The free end of the support rod 49 abuts against the abutment boss 50.

[0049] Specifically, the guide plate 48 is hingedly connected, and it is supported and fixed in a triangular form by abutting against the abutting boss 50 through the support rod 49 below. It can be folded up when not needed for easy transportation and storage. The hinge position is located between the upper end and the middle part of the guide plate 48. When it is rotated and flipped up, the overlapping part 54 at the upper end of the guide plate 48 is rotated into the box. The overlapping part 54 is used for overlapping the guide plate 48 to ensure the stable docking of the discharge plate 44 and the guide plate 48, thereby improving the smoothness of the discharge.

[0050] Specific working principle: When in operation, first adjust the equipment state, flip up the guide plate 48, and the support rod 49 below it against the abutment boss 50. When discharging is not required, rotate the discharge plate 44 to a horizontal state, continue to screw in the limit screw 46, and the discharge plate 44 rests on the limit screw 46. When discharging is required, reverse the limit screw 46 and rotate the discharge plate 44 downward, with its outer end resting on the overlapping portion 54 of the guide plate 48. The material to be crushed is fed into the feeding port 11, passes through the discharge channel 23, and is crushed and processed in the double crushing roller assembly 21. The crushed stones fall onto the secondary filter 41 and continue to roll or slide downward. During this process, smaller stones fall through the mesh of the secondary filter 41 and fall onto the discharge plate 44, while larger stones continue to move downward. After two filtrations, the large stones fall into the receiving basket. During the crushing and discharging process, the first negative pressure suction port 32 and the second negative pressure suction port 51 continue to work to remove dust generated during the process.

[0051] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A high-safety graded stone crushing equipment for municipal road construction, comprising a crushing box (1), wherein the upper end of the crushing box (1) is provided with a feeding port (11), and a crushing mechanism (2) is provided below the feeding port (11), characterized in that: A protective structure (3) for preventing crushed stones from splashing out is provided between the crushing mechanism (2) and the feeding port (11), and a graded discharge mechanism (4) is provided below the crushing mechanism (2).

2. The high-safety graded stone crushing equipment for municipal road construction according to claim 1 is characterized in that: The protective structure (3) comprises a protective plate (31) with an inverted V-shaped cross section, and the orthographic projection surface of the protective plate (31) completely covers the feeding port (11).

3. The high-safety graded stone crushing equipment for municipal road construction according to claim 2, characterized in that: The crushing mechanism (2) includes a double crushing roller assembly (21), and a material guide boss (22) is provided on the inner side wall of the crushing box (1) between the double crushing roller assembly (21) and the protective plate (31). The material guide boss (22) and the protective plate (31) have the same axial direction and a triangular cross-section. A broken-line material discharge channel (23) is formed between the material guide boss (22), the protective plate (31) and the feeding port (11).

4. The high-safety graded stone crushing equipment for municipal road construction according to claim 2, characterized in that: An inspection window (12) is provided on the side wall of the crushing box (1) between the protection plate (31) and the crushing mechanism (2). The inspection window (12) is arranged at one end or both ends of the protection plate (31). A switch door (13) is provided on the inspection window (12).

5. The high-safety graded stone crushing equipment for municipal road construction according to claim 2, characterized in that: A first negative pressure suction port (32) is provided below the protection plate (31), the first negative pressure suction port (32) is fixed on the protection plate (31) and is connected to the negative pressure dust collection device, a protection mesh plate (33) is provided below the first negative pressure suction port (32), and the protection mesh plate (33) is fixedly connected to the lower side of the protection plate (31).

6. The high-safety graded stone crushing equipment for municipal road construction according to any one of claims 1 to 5, characterized in that: The grading discharging mechanism (4) comprises at least two groups of sub-filters (41) vertically distributed below the crushing mechanism (2) for filtering out small-volume stones. The sub-filters (41) are tilted downward, and adjacent sub-filters (41) are respectively fixed on two opposite side surfaces of the crushing box (1). A small stone discharging structure (42) is provided below each sub-filter (41). The bottom of the crushing box (1) is provided with a receiving box (43) for receiving large-volume stones after filtration.

7. The high-safety graded stone crushing equipment for municipal road construction according to claim 6, characterized in that: The small stone discharging structure (42) includes a discharging plate (44) with a U-shaped cross-section, the inner end of the discharging plate (44) is rotatably connected to the inner wall of the crushing box (1), the discharging plate (44) has a horizontal receiving position and a downwardly inclined discharging position at the outer end, and a limiting structure (45) for keeping the discharging plate (44) at the discharging position is provided on the side wall of the crushing box (1), and a discharging port (14) is provided on the side wall of the crushing box (1) below the limiting structure (45) to dock with the discharging plate (44) when the discharging plate (44) rotates to the discharging position.

8. The high-safety graded stone crushing equipment for municipal road construction according to claim 7, characterized in that: The limiting structure (45) includes a limiting screw (46) screwed on a limiting screw hole (53), and there are at least two limiting screw holes (53) that are evenly distributed horizontally on the side wall of the crushing box (1). The outer end of the discharge plate (44) rests on the inner end of the limiting screw (46), and vertical baffles (47) are arranged across the inner wall of the crushing box (1) on both sides of the inner end of the discharge plate (44), and the upper end of the vertical baffle (47) is connected to the lower end of the filter screen (41).

9. The high-safety graded stone crushing equipment for municipal road construction according to claim 7, characterized in that: A guide plate (48) is obliquely provided on the outer side of the discharge port (14), the upper part of the guide plate (48) is hinged on the side wall of the crushing box (1), and the overlapping part (54) at the upper end extends into the crushing box (1), the outer end of the discharge plate (44) overlaps the overlapping part (54) when it is in the discharge position, the bottom surface of the guide plate (48) is hinged with a support rod (49), and an abutment boss (50) is provided on the outer side wall of the crushing box (1), and the free end of the support rod (49) abuts against the abutment boss (50).

10. The high-safety graded stone crushing equipment for municipal road construction according to claim 7, characterized in that: A second negative pressure suction port (51) is provided above the discharge port (14). The second negative pressure suction port (51) is fixed on the outer side wall of the crushing box (1) and is connected to a negative pressure dust suction device.

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