Sandstone crusher for civil engineering construction
By designing air selection components and screening components in the gravel crusher, the problems of sticking together and difficult to remove impurities caused by wet raw materials are solved, and efficient sand and gravel screening and normal operation of equipment are achieved.
Patent Information
- Application Number
- CN202520748824.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2035-04-21
AI Technical Summary
When the existing civil engineering sand and gravel crusher treats wet raw materials, the crushed pieces are easily stuck together, affecting the screening quality; at the same time, the equipment cannot effectively remove impurities such as paper scraps and plastic bags in the sand and gravel, and the screen mesh is easily blocked.
A gravel crusher including crushing components, air selection components and screening components is designed. The air selection component removes paper scraps and plastic bags on the surface of the sand and gravel by hot air. The screening component adopts a movable screen and drive device to achieve uniform screening of the sand and gravel and prevents screening from being blocked.
Effectively remove paper confetti and plastic bags from sand and gravel, improve screening quality and efficiency, prevent screening mesh from being blocked, and ensure the normal operation of the equipment.
Smart Images
Figure CN222901213U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of sand and gravel crushers for engineering construction, in particular to a sand and gravel crusher for civil engineering construction. Background Technique
[0002] A sand and gravel crusher is a mechanical device used to crush large rocks, ores or other hard materials into smaller particles, and is widely used in industries such as mines, construction, and road construction.
[0003] When the existing sand and gravel crushers for civil engineering construction are in use, due to the moisture of the raw materials, the crushed blocks stick together after crushing, affecting the screening quality. In addition, some sand and gravel are mixed with impurities such as paper scraps and plastic bags, which will affect the subsequent use. The existing equipment cannot screen out these impurities. At the same time, when the existing crushers are screening, the filter screens are usually fixed, resulting in low screening quality and even serious problems such as screen blockage. Therefore, we propose a sand and gravel crusher for civil engineering construction. Content of the Utility Model
[0004] The purpose of the utility model is to provide a sand and gravel crusher for civil engineering construction to solve the problems raised in the above background technique.
[0005] To achieve the above purpose, the utility model provides the following technical solution: A sand and gravel crusher for civil engineering construction, including a device main body, a crushing component is installed inside the device main body, a feeding port is opened at the bottom of the inner wall of the device main body, a rectangular block is fixed at the bottom of the device main body at the position of the feeding port, and an air separation component is installed on the front outer wall of the rectangular block. The main function of the air separation component is to screen paper scraps, plastic bags, etc. in the sand and gravel;
[0006] Four groups of support rods are symmetrically fixed at the four corners of the bottom of the rectangular block. On the opposite sides of the two groups of support rods on the left, a screening component is installed. The main function of the screening component is to screen sand and gravel. The screening component includes two first chutes symmetrically opened on the opposite sides of the two groups of support rods on one side, a connecting rod is installed on the inner walls of the two first chutes, two second chutes are symmetrically opened on the opposite inner walls of the two groups of support rods on the other side, a connecting rod is installed on the inner walls of the two second chutes, a screen is fixed on the opposite sides of the two connecting rods, and a driving device for moving the connecting rod up and down is installed at the bottom of the connecting rod on the left.
[0007] Further, the driving device includes two groups of U-shaped grooves symmetrically opened at the bottom of the left connecting rod. The inner walls of the two groups of U-shaped grooves are rotatably connected with circular rotating blocks. The connecting rod is slidably connected to the inner wall of the first chute. The bottom of the first chute is rotatably connected with a rotating rod. Two groups of cams are coaxially fixed on the outer wall of the rotating rod at the position of the circular rotating blocks. The cams are adapted to the circular rotating blocks. A first spring is fixed to the top of the inner wall of the first chute. The bottom of the first spring is fixedly connected with the connecting rod. A second motor is fixed to the outer wall of one of the support rods on the left side. The output end of the second motor is fixedly connected with the rotating rod. A second spring is fixed to the top of the inner wall of the second chute. The bottom of the second spring is fixedly connected with the connecting rod. Two groups of first baffles are symmetrically fixed on the front and rear sides of the top of the screen mesh.
[0008] Further, the air separation component includes an air outlet opened on the left outer wall of the rectangular block. A waste outlet is opened on the right outer wall of the rectangular block. A second filter screen is fixed to the left outer wall of the air outlet. A third filter screen is fixed to the right outer wall of the air outlet. A heating rod is fixed to the middle of the inner wall of the air outlet. A second motor is fixed to the front outer wall of the rectangular block. The output end of the second motor is fixedly connected with the heating rod. A rectangular groove is fixed to the left outer wall of the air outlet. Three groups of fans are equidistantly fixed to the inner wall of the rectangular groove. A first filter screen is fixed to the left outer wall of the air outlet.
[0009] Further, four groups of support columns are symmetrically fixed at the four corners of the bottom of the equipment main body. A first conveying component is installed inside the four groups of support columns. A second conveying component is installed at the bottom of the four groups of support columns. The first conveying component includes a second bottom plate fixed to the opposite sides of the support columns. Two groups of plates are symmetrically fixed to the front and rear sides of the top of the second bottom plate. Two groups of first conveying rollers are symmetrically rotatably connected to the opposite sides of the plates. The two groups of first conveying rollers are connected by a first conveyor belt. A fourth motor is fixed to the outer wall of the right support column. The output end of the fourth motor is fixedly connected with the first conveying roller. The second conveying component includes a first bottom plate fixed to the opposite sides of the bottom of the support columns. Two groups of second baffles are symmetrically fixed to the front and rear outer walls of the first bottom plate. Two groups of second conveying rollers are symmetrically rotatably connected to the opposite sides of the two groups of second baffles. The two groups of second conveying rollers are connected by a second conveyor belt. A third motor is fixed to the outer wall of the front second baffle. The output end of the third motor is fixedly connected with the second conveying roller. Two groups of support blocks are symmetrically fixed to the left bottom of the first bottom plate.
[0010] Further, the crushing assembly includes two groups of crushing rollers symmetrically and rotatably connected to the inner wall of the equipment main body. The bottom of the inner wall of the equipment main body is fixed with a trapezoidal feeding chute. Two groups of synchronous wheels are symmetrically and rotatably connected to the outer wall on the right side of the equipment main body. The two groups of synchronous wheels correspond to the two groups of crushing rollers one by one and are coaxially fixedly connected. A first motor is fixed to the outer wall on the right side of the equipment main body. The output end of the first motor is fixedly connected to the synchronous wheel. The two groups of synchronous wheels are connected by a synchronous belt.
[0011] Further, a first discharge inclined plate is fixed to the outer wall on the right side of the rectangular block, and a second discharge inclined plate is fixed to the outer wall on the left side of the rectangular block.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] 1. By providing the equipment main body, the air separation assembly, etc., when in use, when the sand and gravel enter the crushing rollers from the top of the equipment main body and are crushed, three fans and the heating box will be started simultaneously while the debris falls. The heating rod in the heating box is heated, and the fans blow hot air to the place where the sand and gravel fall. In this process, impurities such as paper scraps and plastic bags in the crushed sand and gravel can be blown to the waste outlet and collected through the second discharge inclined plate. At the same time, when the fans blow hot air to the place where the sand and gravel fall, the wet sand and gravel debris can be further dried, facilitating subsequent screening. Through the above design, it is possible to quickly screen impurities such as paper scraps and plastic bags in the sand and gravel and improve the subsequent screening quality.
[0014] 2. By providing the equipment main body, the screening assembly, etc., when in use, when the dried sand and gravel enter the sieve mesh, due to the inclined design of the sieve mesh, and after starting the second motor, the cam will rotate. The rotation of the cam will cause the left connecting rod to shake up and down. During this process, the sand and gravel falling on the sieve mesh will be evenly screened. The fine sand and gravel will pass through the sieve mesh and fall onto the first conveyor belt for collection, and the sand and gravel that do not pass through will fall onto 37 for collection and secondary crushing. Through the above design, it is possible to quickly screen the sand and gravel and improve the screening quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;
[0016] Figure 2 is a structural schematic diagram of the screening assembly of the present utility model;
[0017] Figure 3 is the present utility model Figure 2 the enlarged structural schematic diagram at A in;
[0018] Figure 4 is the present utility model Figure 2 the enlarged structural schematic diagram at B in;
[0019] Figure 5 This is a schematic structural diagram of the air separation component of the present utility model;
[0020] Figure 6 This is a schematic structural diagram of the crushing component of the present utility model;
[0021] Figure 7 This is a schematic partial structural diagram of the equipment main body of the present utility model;
[0022] Figure 8 This is a schematic structural diagram of the first transmission component of the present utility model;
[0023] Figure 9 This is a schematic structural diagram of the second conveying component of the present utility model;
[0024] Figure 10 This is a schematic partial structural diagram of the rectangular block of the present utility model.
[0025] In the figure: 1, equipment main body; 2, air separation component; 3, screening component; 4, crushing component; 5, first conveying component; 6, second conveying component; 7, first bottom plate; 8, second bottom plate; 9, support column; 10, trapezoidal feeding chute; 11, crushing roller; 12, synchronous belt; 13, synchronous pulley; 14, first motor; 15, feeding port; 16, rectangular block; 17, first discharge inclined plate; 18, first baffle; 19, fourth motor; 21, first conveying roller; 22, first conveyor belt; 23, second discharge inclined plate; 24, sieve mesh; 25, second motor; 26, heating box; 27, waste outlet; 28, heating rod; 29, rectangular groove; 30, first filter screen; 31, fan; 32, second filter screen; 33, air outlet; 34, third filter screen; 35, support block; 36, second baffle; 37, second conveyor belt; 38, third motor; 40, second conveying roller; 41, first chute; 42, first spring; 43, support rod; 44, U-shaped groove; 45, cam; 46, circular rotating block; 47, rotating rod; 48, connecting rod; 49, second chute; 50, second spring. Detailed implementation manners
[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0027] Please refer to Figures 1 to 10, a sand crusher for civil engineering construction, comprising an equipment main body 1. A crushing assembly 4 is installed inside the equipment main body 1. A blanking port 15 is opened at the bottom of the inner wall of the equipment main body 1. The crushing assembly 4 includes two groups of crushing rollers 11 symmetrically and rotatably connected to the inner wall of the equipment main body 1. A trapezoidal blanking groove 10 is fixed to the bottom of the inner wall of the equipment main body 1. Two groups of synchronous wheels 13 are symmetrically and rotatably connected to the outer wall on the right side of the equipment main body 1. The two groups of synchronous wheels 13 correspond to the two groups of crushing rollers 11 one by one and are coaxially fixedly connected. A first motor 14 is fixed to the outer wall on the right side of the equipment main body 1. The output end of the first motor 14 is fixedly connected to the synchronous wheel 13. The two groups of synchronous wheels 13 are connected by a synchronous belt 12;
[0028] Before use, the equipment main body 1 needs to be placed on a horizontal ground. The main purpose of this setting is that the equipment main body 1 will not tilt during use. Then, after putting the sand from the top of the equipment main body 1 between the two groups of crushing rollers 11, by starting the first motor 14, the two groups of synchronous wheels 13 drive the crushing rollers 11 to rotate, gradually crushing the sand. The crushed sand will pass through the trapezoidal blanking groove 10 and fall from the blanking port 15 through the rectangular block 16. During the process of passing through the rectangular block 16, the air separation assembly 2 will be started synchronously to process the crushed sand.
[0029] In this embodiment, the above air separation assembly 2 includes an air outlet 33 opened on the left outer wall of the rectangular block 16. A waste outlet 27 is opened on the right outer wall of the rectangular block 16. A second filter screen 32 is fixed to the left outer wall of the air outlet 33. A third filter screen 34 is fixed to the right outer wall of the air outlet 33. A heating rod 28 is fixed at the center of the inner wall of the air outlet 33. A second motor 25 is fixed to the front outer wall of the rectangular block 16. The output end of the second motor 25 is fixedly connected to the heating rod 28. A rectangular groove 29 is fixed to the left outer wall of the air outlet 33. Three groups of fans 31 are equidistantly fixed to the inner wall of the rectangular groove 29. A first filter screen 30 is fixed to the left outer wall of the air outlet 33;
[0030] Next, during the process of the crushed sand and gravel entering the rectangular block 16, at this time, the heating box 26 and the fan 31 will start synchronously. It should be noted here that due to the nature of the sand and gravel itself, the wind speed of the fan 31 will not blow the crushed sand and gravel. The design purpose of the fan 31 is to blow away impurities such as paper scraps and plastic bags remaining on the surface of the sand and gravel. At the same time, the startup of the heating box 26 will cause the heating rod 28 to heat the flowing air. Therefore, the air blown by the fan 31 is hot air. The main purpose of this design is to dry the crushed sand and gravel so that it can be evenly screened in the next step of screening. It should be noted here that the blown paper scraps and plastic bags will be discharged through the waste outlet 27 and collected through the second discharge chute 23. In addition, a third filter screen 34 is designed on the left inner wall of the rectangular block 16 near the heating rod 28. The third filter screen 34 can prevent the sand and gravel from entering the heating rod 28. At the same time, a rectangular groove 29 is designed on the left outer wall of the rectangular block 16. The fan 31 is equidistantly fixed on the inner wall of the rectangular groove 29. The first filter screen 30 and the second filter screen 32 are respectively designed on the left and right sides of the rectangular groove 29. Their main function is to filter the impurities in the flowing air. After the sand and gravel pass through the air separation, they will evenly fall on the screen 24. At the same time, the screening assembly 3 will start and screen the sand and gravel on the screen 24.
[0031] Next, the main function of the above-mentioned screening assembly 3 is to screen the sand and gravel. The screening assembly 3 includes two groups of first chutes 41 symmetrically opened on the opposite sides of two groups of support rods 43 on one side. The inner walls of the two groups of first chutes 41 are provided with connecting rods 48. On the opposite inner sides of the two groups of support rods 43 on the other side, two groups of second chutes 49 are symmetrically opened. The inner walls of the two groups of second chutes 49 are provided with connecting rods 48. The opposite sides of the two groups of connecting rods 48 are fixed with a screen 24. At the bottom of the left connecting rod 48, a driving device for realizing the up and down movement of the connecting rod 48 is installed. The driving device includes two groups of U-shaped grooves 44 symmetrically opened at the bottom of the left connecting rod 48. The inner walls of the two groups of U-shaped grooves 44 are both rotatably connected with circular rotating blocks 46. The connecting rod 48 is slidably connected to the inner wall of the first chute 41. The bottom of the first chute 41 is rotatably connected with a rotating rod 47. At the circular rotating block 46, two groups of cams 45 are coaxially fixed on the outer wall of the rotating rod 47. The cams 45 are adapted to the circular rotating blocks 46. The top of the inner wall of the first chute 41 is fixed with a first spring 42. The bottom of the first spring 42 is fixed to the connecting rod 48. On the outer wall of one of the support rods 43 on the left, a second motor 25 is fixed. The output end of the second motor 25 is fixed to the rotating rod 47. The top of the inner wall of the second chute 49 is fixed with a second spring 50. The bottom of the second spring 50 is fixed to the connecting rod 48. On the front and back sides of the top of the screen 24, two groups of first baffles 18 are symmetrically fixed;
[0032] Specifically, after the sand and gravel fall onto the screen 24, the second motor 25 will start immediately. The second motor 25 drives the rotating rod 47 to rotate, causing the two groups of cams 45 on the surface of the rotating rod 47 to rotate. Four groups of support rods 43 are designed at the bottom of the rectangular block 16. The inner wall of the support rod 43 is connected to the screen 24 through a connecting rod 48. It should be noted that the screen 24 has a certain angle, with the left side being lower and the right side being higher. This design allows the sand and gravel falling on the surface of the screen 24 to roll. Then, two circular rotating blocks 46 are designed at the bottom of the connecting rod 48 on the left side. The circular rotating blocks 46 are adapted to the cams 45. At the same time, a first chute 41 is opened in the inner wall of the left support rod 43. The inner wall of the first chute 41 is connected to the connecting rod 48 through a first spring 42. With the start of the second motor 25, the connecting rod 48 on the left side will vibrate up and down. Therefore, the screen 24 will vibrate regularly. This design can screen the sand and gravel falling on the screen 24 and also prevent the screen 24 from being blocked by sand and gravel, improving the screening efficiency and quality. Then, the unqualified sand and gravel will fall onto the top of the second conveyor belt 37 through the first discharge chute 17 and be collected at the top of the equipment main body 1 for secondary crushing. The qualified ones will directly fall from the bottom of the screen 24 onto the top of the first conveyor belt 22 for transportation and collection. When the sand and gravel crushing is completed, the entire equipment will be powered off to prevent subsequent energy waste.
[0033] Finally, it should be added that four groups of support columns 9 are symmetrically fixed at the four corners of the bottom of the equipment main body 1. A first conveying component 5 is installed inside the four groups of support columns 9, and a second conveying component 6 is installed at the bottom of the four groups of support columns 9. The first conveying component 5 includes a second bottom plate 8 fixed on the opposite sides of the support columns 9. Two groups of plates are symmetrically fixed on the front and rear sides of the top of the second bottom plate 8. Two groups of first conveying rollers 21 are symmetrically rotatably connected to the opposite sides of the plates. The two groups of first conveying rollers 21 are connected by a first conveyor belt 22. The outer wall of the right support column 9 is fixed with a fourth motor 19, and the output end of the fourth motor 19 is fixedly connected to the first conveying roller 21. The second conveying component 6 includes a first bottom plate 7 fixed on the opposite sides of the bottom of the support columns 9. Two groups of second baffles 36 are symmetrically fixed on the front and rear outer walls of the first bottom plate 7. Two groups of second conveying rollers 40 are symmetrically rotatably connected to the opposite sides of the two groups of second baffles 36. The two groups of second conveying rollers 40 are connected by a second conveyor belt 37. The outer wall of the front second baffle 36 is fixed with a third motor 38, and the output end of the third motor 38 is fixedly connected to the second conveying roller 40. Two groups of support blocks 35 are symmetrically fixed at the left bottom of the first bottom plate 7;
[0034] At the bottom of the screen 24, a matching first conveyor belt 22 is designed. By starting the fourth motor 19, the first conveyor belt 22 rotates towards the right, collecting the sand and gravel evenly. At the bottom of the first discharge chute 17, a matching second conveyor belt 37 is designed. By starting the third motor 38, the second conveyor roller 40 will rotate evenly, causing the second conveyor belt 37 to transport and move towards the left, and collecting the unqualified sand and gravel.
[0035] Working principle: After putting sand and gravel on top of the equipment main body 1 between two groups of crushing rollers 11, by starting the first motor 14, the two groups of synchronous pulleys 13 drive the crushing rollers 11 to rotate, gradually crushing the sand and gravel. The crushed sand and gravel will fall through the trapezoidal feeding chute 10 from the feeding port 15 past the rectangular block 16. When the crushed sand and gravel enter the rectangular block 16, at this time, the heating box 26 and the fan 31 will start synchronously. It should be noted here that due to the nature of the sand and gravel itself, the wind speed of the fan 31 will not blow the crushed sand and gravel. The design purpose of the fan 31 is to blow away impurities such as paper scraps and plastic bags remaining on the surface of the sand and gravel. At the same time, the start of the heating box 26 will cause the heating rod 28 to heat the flowing air. Therefore, the air blown by the fan 31 is hot air. The main purpose of this design is to dry the crushed sand and gravel so that it can be evenly screened in the next step of screening. It should be noted here that the blown paper scraps and plastic bags will be discharged through the waste outlet 27 and collected through the second discharge chute 23. In addition, a third filter screen 34 is designed on the left inner wall of the rectangular block 16 near the heating rod 28. The third filter screen 34 can prevent sand and gravel from entering the heating rod 28. At the same time, a rectangular groove 29 is designed on the left outer wall of the rectangular block 16. The fan 31 is evenly fixed on the inner wall of the rectangular groove 29. First filter screens 30 and second filter screens 32 are designed on the left and right sides of the rectangular groove 29 respectively. Their main function is to filter impurities in the flowing air. After the sand and gravel are subjected to air separation, they will evenly fall on the screen 24. After the sand and gravel fall into the screen 24, the second motor 25 will be started immediately. The second motor 25 drives the rotating rod 47 to rotate, causing the two groups of cams 45 on the surface of the rotating rod 47 to rotate. Four groups of support rods 43 are designed at the bottom of the rectangular block 16. The inner walls of the support rods 43 are connected to the screen 24 through connecting rods 48. It should be noted that the screen 24 has a certain angle, with the left side being a little lower and the right side being a little higher. This design can make the sand and gravel falling on the surface of the screen 24 roll. Then, two circular rotating blocks 46 are designed at the bottom of the connecting rod 48 on the left side. The circular rotating blocks 46 are adapted to the cams 45. At the same time, a first sliding groove 41 is opened in the inner wall of the left support rod 43. The inner wall of the first sliding groove 41 is connected to the connecting rod 48 through a first spring 42. With the start of the second motor 25, the connecting rod 48 on the left side will vibrate up and down. Therefore, the screen 24 will vibrate regularly. This design can screen the sand and gravel falling on the screen 24 and also prevent the screen 24 from being blocked by sand and gravel, improving the screening efficiency and quality. Then, the unqualified sand and gravel will fall onto the top of the second conveyor belt 37 through the first discharge chute 17 and be collected at the top of the equipment main body 1 for secondary crushing. The qualified ones will directly fall to the top of the first conveyor belt 22 from the bottom of the screen 24 for transportation and collection. When the crushing of sand and gravel is completed, the entire equipment will be powered off completely to prevent subsequent energy waste.
[0036] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.
Claims
1. A sand and gravel crusher for civil engineering construction, comprising a device body (1), characterized in that: A crushing assembly (4) is installed inside the equipment body (1), a feeding port (15) is provided at the bottom of the inner wall of the equipment body (1), a rectangular block (16) is fixed at the bottom of the equipment body (1) at the feeding port (15), and a wind selection assembly (2) is installed on the front outer wall of the rectangular block (16). The main function of the wind selection assembly (2) is to screen paper scraps and plastic bags in sand and gravel; Four groups of support rods (43) are symmetrically fixed at the four corners of the bottom of the rectangular block (16); a screening assembly (3) is installed on the opposite sides of the two groups of support rods (43) on the left side; the main function of the screening assembly (3) is to screen sand and gravel; the screening assembly (3) comprises two groups of first chutes (41) symmetrically arranged on the opposite sides of the two groups of support rods (43) on one side; connecting rods (48) are installed on the inner walls of the two groups of first chutes (41); two groups of second chutes (49) are symmetrically arranged on the inner walls of the opposite sides of the two groups of support rods (43) on the other side; connecting rods (48) are installed on the inner walls of the two groups of second chutes (49); a screen (24) is fixed on the opposite sides of the two groups of connecting rods (48); and a driving device for realizing the up and down movement of the connecting rods (48) is installed at the bottom of the connecting rods (48) on the left side.
2. A sand and gravel crusher for civil engineering construction according to claim 1, characterized in that: The driving device comprises two groups of U-shaped grooves (44) symmetrically arranged at the bottom of the left connecting rod (48), the inner walls of the two groups of U-shaped grooves (44) are both rotatably connected to circular rotating blocks (46), the connecting rod (48) is slidably connected to the inner wall of the first slide groove (41), the bottom of the first slide groove (41) is rotatably connected to a rotating rod (47), the outer wall of the rotating rod (47) is coaxially fixed with two groups of cams (45) at the circular rotating block (46), the cams (45) are adapted to the circular rotating block (46), and the first slide groove (41) is rotatably connected to the inner wall of the first slide groove (41). ) is fixed to the top of the inner wall of the second chute (49), the bottom of the first spring (42) is fixedly connected to the connecting rod (48), a second motor (25) is fixed to the outer wall of a support rod (43) located on the left side, the output end of the second motor (25) is fixedly connected to the rotating rod (47), a second spring (50) is fixed to the top of the inner wall of the second slide groove (49), the bottom of the second spring (50) is fixedly connected to the connecting rod (48), and two groups of first baffles (18) are symmetrically fixed on the front and rear sides of the top of the screen (24).
3. A sand and gravel crusher for civil engineering construction according to claim 1, characterized in that: The air selection component (2) comprises an air outlet (33) provided on the left outer wall of the rectangular block (16); a waste outlet (27) is provided on the right outer wall of the rectangular block (16); a second filter (32) is fixed to the left outer wall of the air outlet (33); a third filter (34) is fixed to the right outer wall of the air outlet (33); a heating rod (28) is fixed at the center of the inner wall of the air outlet (33); a second motor (25) is fixed to the front outer wall of the rectangular block (16); an output end of the second motor (25) is fixedly connected to the heating rod (28); a rectangular groove (29) is fixed to the left outer wall of the air outlet (33); three sets of fans (31) are equidistantly fixed to the inner wall of the rectangular groove (29); and a first filter (30) is fixed to the left outer wall of the air outlet (33).
4. The sand and gravel crusher for civil engineering construction according to claim 1, characterized in that: Four groups of support columns (9) are symmetrically fixed at the four corners of the bottom of the equipment body (1), the inner walls of the four groups of support columns (9) are installed with first conveying components (5), the bottoms of the four groups of support columns (9) are installed with second conveying components (6), the first conveying components (5) include a second bottom plate (8) fixed to the opposite side of the support column (9), two groups of plates are symmetrically fixed on the front and rear sides of the top of the second bottom plate (8), the opposite side of the plate is symmetrically connected with two groups of first conveying rollers (21), the two groups of first conveying rollers (21) are connected by a first conveyor belt (22), the outer wall of the right support column (9) is fixed with a fourth motor (19), the output end of the fourth motor (19) is connected to the output end of the fourth motor (19) The first conveying roller (21) is fixedly connected, the second conveying assembly (6) comprises a first bottom plate (7) fixed to opposite sides of the bottom of the support column (9), two groups of second baffles (36) are symmetrically fixed to the outer walls on both sides of the front and rear of the first bottom plate (7), two groups of second conveying rollers (40) are symmetrically rotatably connected to the opposite sides of the two groups of second baffles (36), the two groups of second conveying rollers (40) are connected via a second conveyor belt (37), a third motor (38) is fixed to the outer wall of the second baffle (36) on the front side, the output end of the third motor (38) is fixedly connected to the second conveying roller (40), and two groups of support blocks (35) are symmetrically fixed to the left bottom of the first bottom plate (7).
5. The sand and gravel crusher for civil engineering construction according to claim 1, characterized in that: The crushing assembly (4) comprises two groups of crushing rollers (11) symmetrically rotatably connected to the inner wall of the equipment body (1); a trapezoidal material discharge trough (10) is fixed at the bottom of the inner wall of the equipment body (1); two groups of synchronous wheels (13) are symmetrically rotatably connected to the right outer wall of the equipment body (1); the two groups of synchronous wheels (13) correspond to the two groups of crushing rollers (11) one by one and are coaxially fixedly connected; a first motor (14) is fixed to the right outer wall of the equipment body (1); the output end of the first motor (14) is fixedly connected to the synchronous wheel (13); and the two groups of synchronous wheels (13) are connected via a synchronous belt (12).
6. A sand and gravel crusher for civil engineering construction according to claim 3, characterized in that: A first discharging inclined plate (17) is fixed to the right outer wall of the rectangular block (16), and a second discharging inclined plate (23) is fixed to the left outer wall of the rectangular block (16).