Building construction gravel crushing device and method

Abstract

The invention provides a building construction gravel crushing device, and relates to the technical field of gravel crushing. According to the building construction gravel crushing device, a first motor drives a flat driving wheel to rotate, meanwhile, a driven mechanism engaged with the flat driving wheel and a driven gear rotate together, and two second driven wheels engaged with the driven mechanism and the driven gear correspondingly are driven to rotate together, so that two crushing rollers rotate, and gravel crushing is achieved; in the process, through the cooperative design of a flat driving wheel, a driven mechanism, a driven gear, a second driven wheel, a first connecting rod and a second connecting rod, the transmission effect between a first motor and the crushing rollers is not affected even if the distance between the two crushing rollers is changed; and the operation distance between the crushing rollers can be conveniently adjusted according to materials with different sizes, the situation that large materials splash to the outside of the feeding shell during grinding is avoided, and the gravel crushing effect is improved.

Description

Technical Field

[0001] The present invention relates to a crushing device, in particular to a sand and gravel crushing device and method for construction, belonging to the technical field of sand and gravel crushing. Background Art

[0002] Sand and gravel crushers are machines that use methods such as squeezing, splitting, bending, impacting, and rolling to break large pieces of sand and gravel into fragments. Common types of crushers include jaw, cone, hammer, and roller crushers.

[0003] The patent specification with announcement number CN216538672U discloses an integrated sand and gravel crushing and screening device for construction. The crushing device is provided with a connecting rod, a chute, a slider, a connecting plate, a driving block, a limiting rod, a rotating shaft, a second driving motor and a supporting block. When the second driving motor is started, the second driving motor drives the driving block to rotate via the rotating shaft. The rotation of the driving block can cause the connecting rod to rise. When the connecting rod is connected, the slider slides inside the chute. By sliding the slider inside the chute, the first and second sieve plates can be driven to vibrate. The shaking of the first and second sieve plates not only improves the efficiency of sand and gravel screening but also facilitates the discharge of the screened sand and gravel from the inside of the box through the discharge port. The limiting rod can limit the position of the driving plate. The second sieve plate and the first sieve plate can perform multi-level classification of sand and gravel. In addition, it is provided with a baffle, a first guide plate, a connecting shaft, a support plate and a first drive motor. The first drive motor on the top of the support plate is started, and the first drive motor drives the baffle to rotate inside the feed port through the connecting shaft. When the baffle rotates, the sand and gravel to be crushed are placed inside the feed port. Since the baffles are distributed in a ring shape on the outside of the connecting shaft with equal mesh spacing, the sand and gravel can be evenly dropped between the crushing components by driving the baffle to rotate through the connecting shaft. By making the sand and gravel evenly fall between the crushing components, it can be prevented that too much sand and gravel enters and causes the crushing components to be blocked or damaged. The first guide plate can limit the sand and gravel to prevent it from falling elsewhere.

[0004] Combined with the above-mentioned patented technical solution, it can be seen that the above-mentioned integrated sand and gravel crushing and screening device for construction is not convenient for adjusting the operating spacing of the grinding disc according to different types of sand and gravel. Since the sizes and shapes of different types of sand and gravel are also different, larger pieces of sand and gravel are easily splashed out of the grinding device during grinding, and the crushing effect needs to be improved. For this reason, we provide a construction sand and gravel crushing device to solve the above problems. Summary of the Invention

[0005] The present invention provides a construction sand and gravel crushing device and method to solve the problem in the prior art that the grinding device is inconvenient to adjust the working distance of the grinding disc according to different types of sand and gravel when in use.

[0006] The present invention is achieved through the following technical solutions: a construction sand and gravel crushing device, including a grinding drum, a feeding shell is fixed on the top of the grinding drum, and support frames are fixed on both sides of the feeding shell, and two slide grooves are provided inside each of the support frames, and two crushing rollers are arranged inside the feeding shell, and one side of the feeding shell is rotatably connected to a first transmission rod, and the outer periphery of the first transmission rod is rotatably sleeved with a first connecting rod, and the end of the first transmission rod close to the feeding shell respectively passes through the support frame and the first connecting rod and is fixedly sleeved with a flat driving wheel, and both ends of the first connecting rod are fixedly sleeved with a connecting shaft, and the outer periphery of each connecting shaft is rotatably sleeved with a second connecting rod, and each second The ends of the connecting rods away from the connecting shaft are rotatably connected to the first rotating rod, and two corresponding sets of transmission grooves are opened on the two side surfaces of the feed shell. The two ends of the two first rotating rods slide through the transmission grooves on the two side surfaces of the feed shell, and are fixedly sleeved on the inside of the two crushing rollers respectively. The outer surfaces of the two first rotating rods are fixedly sleeved with the second driven wheels, and the second driven wheels are located between the outer surface of the feed shell and the second connecting rod. The periphery of one of the connecting shafts is rotatably connected to a driven mechanism, and the driven mechanism includes a connecting frame rotatably connected to one end of the connecting shaft, and the inner side wall of the connecting frame is rotatably connected to two mutually meshing steering wheels, and the two steering wheels are respectively meshed with the periphery of the flat driving wheel and the second driven wheel.

[0007] Specifically, a first motor is fixed to one side surface of one of the support frames, and an output end of the first motor is fixed to an end of the first transmission rod away from the feed shell.

[0008] Specifically, the driven mechanism is engaged between the flat driving wheel and one of the second driven wheels, and the driven mechanism is slidably arranged on the outer surface of the feed shell.

[0009] Specifically, the driven mechanism includes a positioning frame fixed on one side of the feed shell, the side of the connecting frame away from the connecting shaft is in contact with the outside of the feed shell, a sliding rod is fixed on the top surface of the connecting frame, the outer periphery of the sliding rod is slidably sleeved with a slider, and the outer periphery of the slider is slidably connected to the inside of the positioning frame.

[0010] A group of support blocks are fixed on both sides of the feed shell, and a two-way threaded rod is rotatably sleeved between each group of support blocks. Two sections of threads in opposite directions are provided at both ends of each two-way threaded rod. Both ends of each two-way threaded rod are threadedly connected to a moving frame, and the bottom end of each of the moving frames is fixed with a moving block slidably connected to the inside of the slide groove. Each of the moving blocks is rotatably sleeved on the outer periphery of the corresponding first rotating rod, and the first rotating rod slides through the slide groove.

[0011] Specifically, one side of the grinding cylinder is rotatably connected to a double-headed worm, and two ends of the double-headed worm are provided with two sections of threads in the same direction. Both ends of the double-headed worm are engaged with worm wheels fixedly sleeved on the periphery of the bidirectional threaded rod. The length of the double-headed worm is greater than the distance between the two worm wheels, and one end of the double-headed worm located outside the worm wheel is fixedly sleeved with a rocker.

[0012] Specifically, a grinding mechanism for grinding crushed sand and gravel is provided inside the grinding cylinder, and the grinding mechanism includes a second motor fixed on one side of the grinding cylinder and a grinding disk slidably connected to the bottom end of the grinding cylinder, a second transmission rod is fixed to the output end of the second motor, and the end of the second transmission rod away from the second motor passes through one side of the grinding cylinder and is fixedly sleeved with a driving bevel gear, the outer periphery of the driving bevel gear is meshed with a driven bevel gear, and the interior of the driven bevel gear is fixedly sleeved with a second rotating rod, and the bottom end of the second rotating rod is fixedly penetrated through the grinding disk and is rotatably connected to the inner bottom wall of the grinding cylinder.

[0013] The use of the construction sand and gravel crushing device is as follows: First, adjust the distance between the two crushing rollers according to the size of the sand and gravel: rotate the rocker to drive the double-headed worm to rotate, and the double-headed worm can drive the two worm wheels and two bidirectional threaded rods to rotate. When the two bidirectional threaded rods rotate, they can drive the two movable frames on each bidirectional threaded rod to move relative to each other or move toward and away from each other, so that the two first rotating rods can move relative to each other or move toward and away from each other, thereby adjusting the distance between the two crushing rollers; 2. After adjusting the distance between the two crushing rollers, start the first motor to drive the flat driving wheel to rotate, so as to drive the two second driven wheels to rotate through the flat driving wheel, so that the two crushing rollers rotate to crush the sand and gravel raw materials and crush large pieces of sand and gravel into small pieces; 3. The sand and gravel crushed into small pieces slide to the bottom of the grinding cylinder, and the second motor is started to rotate the second transmission rod, the active bevel gear, the second rotating rod and the grinding disc to grind the sand and gravel to ensure the crushing effect of the sand and gravel.

[0014] The present invention provides a sand and gravel crushing device for construction, which has the following beneficial effects: The construction sand and gravel crushing device drives the flat driving wheel to rotate by a first motor. At the same time, the driven mechanism and the driven gear meshed with the flat driving wheel rotate together, and drive the two second driven wheels meshed with the driven mechanism and the driven gear to rotate together, so that the two crushing rollers can be rotated to crush the sand and gravel. In the above process, the coordinated design between the flat driving wheel, the driven mechanism, the driven gear, the second driven wheel, the first connecting rod and the second connecting rod does not affect the transmission effect between the first motor and the crushing rollers even if the distance between the two crushing rollers changes, so that the operating spacing of the crushing rollers can be adjusted according to the different volumes of sand and gravel, so that large pieces of sand and gravel can be prevented from splashing to the outside of the feed shell during grinding.

[0015] The construction sand and gravel crushing device has a structure in which, when the crushed sand and gravel enter the interior of the grinding cylinder, the second motor drives the second transmission rod to rotate inside the grinding cylinder. The second transmission rod, the active bevel gear, the driven bevel gear and the second rotating rod cooperate to drive the grinding disc to rotate on the inner bottom wall of the grinding cylinder, thereby grinding the sand and gravel crushed into small pieces again and improving the sand and gravel crushing effect.

[0016] Other advantages, objects and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the surface structure of the feed shell in the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the feed housing in the present invention from a second viewing angle; Figure 4 For the present invention Figure 2 Schematic diagram of the local structure in; Figure 5 Schematic diagram of the three-dimensional structure of the grinding mechanism of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the driven mechanism in the present invention.

[0018] Description of Reference Numerals 1. Grinding cylinder; 2. Feed shell; 3. Crushing roller; 4. First motor; 41. First transmission rod; 42. First connecting rod; 43. Connecting shaft; 44. Second connecting rod; 45. First rotating rod; 46. Flat driving wheel; 47. Driven mechanism; 48. Second driven wheel; 471, connecting frame; 472, steering wheel; 473, slide bar; 474, positioning frame; 475, slider; 5. Support frame; 6. Slide; 71. Double-ended worm; 72. Rocker; 73. Worm gear; 74. Bidirectional threaded rod; 75. Support block; 76. Moving frame; 77. Moving block; 8. Grinding mechanism; 81. Second motor; 82. Second transmission rod; 83. Active bevel gear; 84. Driven bevel gear; 85. Second rotating rod; 86. Grinding disc. DETAILED DESCRIPTION

[0019] Please refer to Figures 1 to 6 An embodiment of the present invention provides a construction sand and gravel crushing device, including a grinding cylinder 1, a feed shell 2 is fixed to the top of the grinding cylinder 1, support frames 5 are fixed to both sides of the feed shell 2, each support frame 5 has two slide grooves 6 inside, and two crushing rollers 3 are arranged inside the feed shell 2.

[0020] One side of the feed shell 2 is rotatably connected to a first transmission rod 41, and the outer periphery of the first transmission rod 41 is rotatably sleeved with a first connecting rod 42, and the end of the first transmission rod 41 close to the feed shell 2 respectively passes through the support frame 5 and the first connecting rod 42 and is fixedly sleeved with a flat driving wheel 46, and both ends of the first connecting rod 42 are fixedly sleeved with a connecting shaft 43, and the outer periphery of each connecting shaft 43 is rotatably sleeved with a second connecting rod 44, and the end of each second connecting rod 44 away from the connecting shaft 43 is rotatably connected to a first rotating rod 45, and two corresponding sets of transmission grooves are opened on the two side surfaces of the feed shell 2, and the two ends of the two first rotating rods 45 respectively slide through the transmission grooves on the two side surfaces of the feed shell 2, and are respectively fixedly sleeved with the inside of the two crushing rollers 3, and the outer surfaces of the two first rotating rods 45 are fixedly sleeved with a second driven wheel 48, and the second driven wheel 48 is located between the outer surface of the feed shell 2 and the second connecting rod 44, and the outer periphery of one of the connecting shafts 43 is rotatably connected to a driven mechanism 47.

[0021] The driven mechanism 47 includes a connecting frame 471 rotatably connected to one end of the connecting shaft 43 , and the inner side wall of the connecting frame 471 is rotatably connected to two mutually meshing steering wheels 472 , which are respectively meshed with the periphery of the flat driving wheel 46 and the second driven wheel 48 .

[0022] Please refer to Figure 1 and Figure 2 A first motor 4 is fixed to one side of one of the support frames 5 , and an output end of the first motor 4 is fixed to an end of the first transmission rod 41 away from the feed housing 2 .

[0023] The driven mechanism 47 is engaged between the flat driving wheel 46 and one of the second driven wheels 48, and is slidingly arranged on the outer surface of the feeding shell 2.

[0024] In the above scheme, when the sand enters the inside of the feeding shell 2, the flat driving wheel 46 is driven to rotate by the first motor 4, and the driven mechanism 47 engaged with the flat driving wheel 46 rotates together with the driven gear 49, and drives the two second driven wheels 48 engaged with the driven mechanism 47 and the driven gear 49 to rotate together, so that the two crushing rollers 3 can crush the sand, and the large pieces of sand are crushed into small pieces, and then the subsequent grinding operation is performed. In the above process, the transmission effect between the first motor 4 and the crushing roller 3 is not affected when the distance between the two crushing rollers 3 changes, and the operation distance of the crushing roller 3 can be adjusted according to the different volumes of sand.

[0025] Please refer to Figure 2 and Figure 6 The driven mechanism 47 includes a positioning frame 474 fixed to one side of the feeding shell 2, and a connecting frame 471 away from the side of the connecting shaft 43 and in contact with the outside of the feeding shell 2. The top surface of the connecting frame 471 is fixed with a sliding rod 473, the periphery of the sliding rod 473 is slidingly sleeved with a sliding block 475, and the periphery of the sliding block 475 is slidingly connected to the inside of the positioning frame 474.

[0026] In the above scheme, the cooperation between the driven gear 49 and the flat driving wheel 46 makes one of the second driven wheels 48 rotate in the same direction as the flat driving wheel 46, and the transmission between the two steering wheels 472 in the driven mechanism 47 can make the other second driven wheel 48 rotate in the opposite direction of the flat driving wheel 46, so that the distance between the two crushing rollers 3 can be adjusted without affecting the rotation of the two crushing rollers 3 inward and crushing the sand.

[0027] Please refer to Figure 1 , Figure 3 and Figure 4 Each side of the feeding shell 2 is fixed with a set of supporting blocks 75, and each set of supporting blocks 75 is rotatably sleeved with a bidirectional threaded rod 74. Each bidirectional threaded rod 74 is provided with two sections of threads in opposite directions at both ends, and each bidirectional threaded rod 74 is threadedly connected with a moving frame 76 at both ends. The bottom end of each moving frame 76 is fixed with a moving block 77 slidingly connected to the inside of the sliding groove 6, and each moving block 77 is rotatably sleeved around the corresponding first rotating rod 45, and the first rotating rod 45 slidingly penetrates the sliding groove 6.

[0028] Please refer to Figure 1 and Figure 3A double-headed worm 71 is rotatably connected to one side of the grinding cylinder 1. Two ends of the double-headed worm 71 are provided with two sections of threads in the same direction. Both ends of the double-headed worm 71 are engaged with a worm wheel 73 fixedly sleeved on the outer periphery of the bidirectional threaded rod 74. The length of the double-headed worm 71 is greater than the distance between the two worm wheels 73, and one end of the double-headed worm 71 located outside the worm wheel 73 is fixedly sleeved with a rocker 72.

[0029] In the above scheme, the rocker 72 is rotated by external force, and the two bidirectional threaded rods 74 can be rotated simultaneously through the cooperation between the rocker 72, the double-headed worm 71, and the worm wheel 73. The cooperation between the bidirectional threaded rod 74, the movable frame 76 and the movable block 77 drives the crushing roller 3 to move horizontally inside the feed shell 2, so that the operating distance between the two crushing rollers 3 can be adjusted according to the size of different sand and gravel, thereby improving the practicality of the grinding device.

[0030] Please refer to Figure 5 A grinding mechanism 8 for grinding crushed sand and gravel is provided inside the grinding cylinder 1. The grinding mechanism 8 includes a second motor 81 fixed to one side of the grinding cylinder 1 and a grinding disc 86 slidably connected to the bottom end of the grinding cylinder 1. A second transmission rod 82 is fixed to the output end of the second motor 81. The end of the second transmission rod 82 away from the second motor 81 passes through one side of the grinding cylinder 1 and is fixedly sleeved with a driving bevel gear 83. The periphery of the driving bevel gear 83 is meshed with a driven bevel gear 84. The interior of the driven bevel gear 84 is fixedly sleeved with a second rotating rod 85. The bottom end of the second rotating rod 85 is fixedly penetrates the grinding disc 86 and is rotatably connected to the inner bottom wall of the grinding cylinder 1.

[0031] In the above scheme, the second motor 81 drives the second transmission rod 82 to rotate inside the grinding cylinder 1. Through the cooperation between the second transmission rod 82, the active bevel gear 83, the driven bevel gear 84 and the second rotating rod 85, the grinding disc 86 is driven to rotate on the inner bottom wall of the grinding cylinder 1 to grind the sand and gravel.

[0032] The use of the construction sand and gravel crushing device is as follows: First, the spacing between the two crushing rollers 3 is adjusted according to the size of the sand and gravel: the rocker 72 is rotated to drive the double-headed worm 71 to rotate, and the double-headed worm 71 can drive the two worm wheels 73 and the two bidirectional threaded rods 74 to rotate. When the two bidirectional threaded rods 74 rotate, they can drive the two movable frames 76 on each bidirectional threaded rod 74 to move relative to each other or move toward and away from each other, so that the two first rotating rods 45 can move relative to each other or move toward and away from each other, thereby adjusting the spacing between the two crushing rollers 3; 2. After adjusting the distance between the two crushing rollers 3, start the first motor 4 to drive the flat driving wheel 46 to rotate, thereby driving the two second driven wheels 48 to rotate, so that the two crushing rollers 3 rotate to crush the sand and gravel raw materials, and crush large pieces of sand and gravel into small pieces; 3. The crushed sand and gravel slide to the bottom of the grinding cylinder 1, and the second motor 81 is started to rotate the second transmission rod 82, the driving bevel gear 83, the second rotating rod 85 and the grinding disc 86 to grind the sand and gravel to ensure the crushing effect of the sand and gravel.

[0033] Working principle: When the grinding device is in use, sand and gravel are fed into the grinding cylinder 1 through the feed housing 2. When the sand and gravel enter the feed housing 2, the flat driving wheel 46 is driven to rotate by the first motor 4. At the same time, the driven mechanism 47 and the driven gear 49 meshing with the flat driving wheel 46 rotate together, and drive the two second driven wheels 48 meshing with the driven mechanism 47 and the driven gear 49 to rotate together, so that the two crushing rollers 3 can be rotated to crush the grinding sand and gravel, and crush the large pieces of sand and gravel into small pieces before grinding. In the above process, due to the coordinated design between the flat driving wheel 46, the driven mechanism 47, the second driven wheel 48, the driven gear 49, the first connecting rod 42 and the second connecting rod 44, even if the distance between the two crushing rollers 3 changes, the transmission effect between the first motor 4 and the crushing roller 3 is not affected. The cooperation between the driven gear 49 and the flat driving wheel 46 enables one of the second driven wheels 48 to rotate in the same direction as the flat driving wheel 46. The transmission between the two steering wheels 472 inside the driven mechanism 47 enables the other second driven wheel 48 to rotate in the opposite direction to the flat driving wheel 46. This allows the distance between the two crushing rollers 3 to be adjusted while maintaining the inward rotation of the two crushing rollers 3 to crush the sand and gravel. The rocker 72 is rotated by external force, and the two bidirectional threaded rods 74 are rotated simultaneously through the cooperation between the rocker 72, the double-headed worm 71, and the worm wheel 73. The two bidirectional threaded rods 74, the movable frame 76, and the movable block 77 are then used to drive the crushing rollers 3 to move horizontally inside the feed housing 2, so that the operating distance between the two crushing rollers 3 can be adjusted according to the size of the sand and gravel, thereby improving the practicality of the grinding device. After the crushing, the sand and gravel fall to the bottom of the grinding cylinder 1, and then the second motor 81 drives the second transmission rod 82 to rotate inside the grinding cylinder 1. Through the cooperation between the second transmission rod 82, the active bevel gear 83, the driven bevel gear 84 and the second rotating rod 85, the grinding disc 86 is driven to rotate on the inner bottom wall of the grinding cylinder 1 to grind the sand and gravel.

[0034] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction sand and gravel crushing device, comprising a grinding drum (1), characterized in that: A feed shell (2) is fixed to the top of the grinding cylinder (1), and support frames (5) are fixed to both sides of the feed shell (2), and two slide grooves (6) are provided inside each support frame (5). Two crushing rollers (3) are provided inside the feed shell (2); a first transmission rod (41) is rotatably connected to one side of the feed shell (2), and a first connecting rod (42) is rotatably sleeved on the outer periphery of the first transmission rod (41), and an end of the first transmission rod (41) close to the feed shell (2) passes through the support frame (5) and the first connecting rod (42) and is fixedly sleeved. A flat driving wheel (46), both ends of the first connecting rod (42) are fixedly sleeved with a connecting shaft (43), the outer periphery of each connecting shaft (43) is rotatably sleeved with a second connecting rod (44), and the end of each second connecting rod (44) away from the connecting shaft (43) is rotatably connected to a first rotating rod (45), two sets of corresponding transmission grooves are opened on the two side surfaces of the feed shell (2), and the two ends of the two first rotating rods (45) respectively slide through the transmission grooves on the two side surfaces of the feed shell (2) and are fixedly sleeved on the inside of the two crushing rollers (3), and the two first rotating rods (45) ) are fixedly sleeved with a second driven wheel (48), and the second driven wheel (48) is located between the outer surface of the feed housing (2) and the second connecting rod (44); the periphery of one of the connecting shafts (43) is rotatably connected to a driven mechanism (47), the driven mechanism (47) includes a connecting frame (471) rotatably connected to one end of the connecting shaft (43), the inner side wall of the connecting frame (471) is rotatably connected to two mutually meshing steering wheels (472), and the two steering wheels (472) are respectively meshed with the peripheries of the flat driving wheel (46) and the second driven wheel (48); the feed A group of support blocks (75) are fixed on both sides of the housing (2), and a bidirectional threaded rod (74) is rotatably sleeved between each group of support blocks (75), and two sections of threads in opposite directions are provided at both ends of each bidirectional threaded rod (74). Both ends of each bidirectional threaded rod (74) are threadedly connected to a moving frame (76), and the bottom end of each moving frame (76) is fixed with a moving block (77) that is slidably connected to the inside of the slide groove (6), and each moving block (77) is rotatably sleeved on the outer periphery of the corresponding first rotating rod (45), and the first rotating rod (45) slides through the slide groove (6).

2. A construction sand and gravel crushing device according to claim 1, characterized in that: One of them A first motor (4) is fixed to one side of the support frame (5), and an output end of the first motor (4) is fixed to an end of the first transmission rod (41) away from the feed housing (2).

3. A construction sand and gravel crushing device according to claim 2, characterized in that: The driven mechanism (47) is engaged between the flat driving wheel (46) and one of the second driven wheels (48), and the driven mechanism (47) is slidably arranged on the outer surface of the feed housing (2).

4. A construction sand and gravel crushing device according to claim 3, characterized in that: The driven mechanism (47) includes a positioning frame (474) fixed to a side of the feed shell (2), a side of the connecting frame (471) away from the connecting shaft (43) contacts the outside of the feed shell (2), a sliding rod (473) is fixed to the top surface of the connecting frame (471), the outer periphery of the sliding rod (473) is slidably sleeved with a slider (475), and the outer periphery of the slider (475) is slidably connected to the inside of the positioning frame (474).

5. The construction sand and gravel crushing device according to claim 1, characterized in that: A double-headed worm (71) is rotatably connected to one side of the grinding cylinder (1). Two sections of threads with the same direction are provided at both ends of the double-headed worm (71). Both ends of the double-headed worm (71) are engaged with a worm wheel (73) fixedly sleeved on the periphery of a bidirectional threaded rod (74). The length of the double-headed worm (71) is greater than the distance between the two worm wheels (73), and one end of the double-headed worm (71) located outside the worm wheel (73) is fixedly sleeved with a rocker (72).

6. The construction sand and gravel crushing device according to claim 1, characterized in that: The grinding cylinder (1) is provided with a grinding mechanism (8) for grinding the crushed sand and gravel inside. The grinding mechanism (8) includes a second motor (81) fixed to one side of the grinding cylinder (1) and a grinding disc (86) slidably connected to the bottom end of the grinding cylinder (1). A second transmission rod (82) is fixed to the output end of the second motor (81). The end of the second transmission rod (82) away from the second motor (81) passes through one side of the grinding cylinder (1) and is fixedly sleeved with a driving bevel gear (83). The outer periphery of the driving bevel gear (83) is meshed with a driven bevel gear (84). The interior of the driven bevel gear (84) is fixedly sleeved with a second rotating rod (85). The bottom end of the second rotating rod (85) is fixedly penetrated through the grinding disc (86) and is rotatably connected to the inner bottom wall of the grinding cylinder (1).

7. A construction sand and gravel crushing device according to claim 1 to claim 6, characterized in that: The method of using the construction sand and gravel crushing device is as follows: First, the spacing between the two crushing rollers (3) is adjusted according to the size of the sand and gravel: the rocker (72) is rotated to drive the double-headed worm (71) to rotate, and the double-headed worm (71) drives the two worm wheels (73) and the two bidirectional threaded rods (74) to rotate. When the two bidirectional threaded rods (74) rotate, the two movable frames (76) on each bidirectional threaded rod (74) can be driven to move relative to each other or move toward and away from each other, so that the two first rotating rods (45) can move relative to each other or move toward and away from each other, thereby adjusting the spacing between the two crushing rollers (3); 2. After adjusting the distance between the two crushing rollers (3), start the first motor (4) to drive the flat driving wheel (46) to rotate, so as to drive the two second driven wheels (48) to rotate through the flat driving wheel (46), so as to rotate the two crushing rollers (3), crush the sand and gravel raw materials, and crush the large sand and gravel into small pieces; 3. The sand and gravel crushed into small pieces slide to the bottom of the grinding cylinder (1), and the second motor (81) is started to rotate with the second transmission rod (82), the driving bevel gear (83), the second rotating rod (85) and the grinding disc (86) to grind the sand and gravel to ensure the crushing effect of the sand and gravel.

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