Sand-stone separation equipment for sand making production

Abstract

The invention provides sand-gravel separation equipment for sand making production, and relates to the technical field of sand-gravel separation, the sand-gravel separation equipment comprises a rack, a roller mounting frame, a spiral conveyor and a collecting box are sequentially arranged on the rack from top to bottom, a roller screen is horizontally arranged on the roller mounting frame, and the roller screen is fixed to the output end of an intermittent rotating mechanism; a crushing mechanism is arranged in the drum screen, a dredging mechanism is arranged above the drum screen, the movable end of the dredging mechanism faces screen holes of the drum screen, and a flow guide plate is arranged at the end, away from the intermittent rotating mechanism, of the drum screen. A closed-loop treatment process of rotating screening, pause dredging and crushing and re-screening is formed, a continuous sand and stone separation treatment process is formed, long-time stable operation of equipment is ensured, multiple times of material transfer is avoided, and the production efficiency is improved. According to the invention, the automation degree is high, the manual intervention is reduced, the labor intensity is reduced, and the production efficiency and the reliability of equipment operation are improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of sand and gravel separation, and in particular to a sand and gravel separation device for sand production. Background Art

[0002] With the rapid development of infrastructure construction, the demand for construction sand has exploded. Therefore, machine-made sand (artificial sand prepared by crushing rocks, construction waste, etc.) has become the main substitute for natural sand. However, the production process of machine-made sand faces problems such as low sand and gravel separation efficiency, high energy consumption, and uneven particle size of finished sand. Especially in scenarios such as construction waste recycling and river pebble sand making, how to achieve efficient separation and fine processing of sand and gravel materials has become a key technical problem that the industry needs to solve urgently.

[0003] Traditional sand and gravel separation equipment usually adopts a combination mode of "screening machine + crusher + conveying equipment", and each functional module operates independently. For example, the drum screen is responsible for screening, the jaw crusher is responsible for crushing, and the belt conveyor is responsible for material transportation. This decentralized design leads to many intermediate links and large material losses. The materials need to be transferred between the equipment through multiple transfer components, which not only increases the material breakage rate, but also causes material loss due to scattering during the transfer process. In addition, the coarse sand after screening needs to be sent to the crusher through additional lifting equipment, and the fine sand after crushing needs to be transported to the screening link again. The whole process is time-consuming and the processing capacity of a single device is low. Summary of the invention

[0004] 1. Technical problems to be solved by the invention: The present invention provides a sand and gravel separation device for sand production, which is used to solve the technical problems existing in the above-mentioned background technology.

[0005] 2. Technical solution: To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a sand and gravel separation equipment for sand making production, comprising a frame, on which a drum mounting frame, a screw conveyor and a collecting box are arranged in sequence from top to bottom, a drum screen is horizontally arranged on the drum mounting frame, the drum screen is fixed at the output end of an intermittent rotation mechanism, a crushing mechanism is arranged inside the drum screen, a dredging mechanism is arranged above the drum screen, the movable end of the dredging mechanism faces the sieve holes of the drum screen, a guide plate is arranged at one end of the drum screen away from the intermittent rotation mechanism, the lower end of the guide plate is connected to the feed port of the screw conveyor, and a protective cover is arranged on the outer side of the frame.

[0006] Preferably, the drum screen comprises an inclined screen drum body, the screen drum body is formed by N screens sequentially spliced together along the circumferential direction, and its cross section is a regular N-gon, N is a natural number greater than or equal to six, each of the screens is provided with screen holes, a plurality of material baffles are evenly and fixedly arranged on the inner wall of the screen drum body along the circumferential direction, the material baffles are distributed along the axial direction of the screen drum body, and a placement space for accommodating sand and gravel is formed between the material baffles and the inner wall of the screen drum body, and when the screen drum body rotates, when the material baffle rotates to the upper position, the sand and gravel will slide along the inclined surface of the material baffle and enter the crushing mechanism; The intermittent rotation mechanism drives the drum screen to rotate intermittently. After the sand and gravel enter the drum screen through the guide plate, the fine sand falls through the screen holes, and the coarse sand is brought upward by the material baffle and slides to the internal crushing mechanism. At the same time, the dredging mechanism dredges the screen holes, and the fine sand falls into the screw conveyor and is finally transported to the collection box.

[0007] Preferably, the drum mounting frame includes a lower frame body and an upper frame body which are arranged in parallel up and down, the lower frame body and the upper frame body are fixed on the frame, and a bearing seat is fixedly provided on the four corners of the top surface of the lower frame body respectively, and a bearing seat is also provided on the four corners of the bottom surface of the upper frame body and the corresponding positions of the lower frame body respectively, a rotating shaft is rotatably installed between every two of the bearing seats through bearings, and a limiting wheel is fixedly installed on both ends of each of the rotating shafts, and the length direction of the rotating shaft is arranged along the axial direction of the screen drum body, and rolling rings are fixedly provided on the front and rear ends of the screen drum body respectively, and the wheel surface of the limiting wheel is in rolling fit with the rolling ring, and the limiting wheel is used to limit the radial displacement of the drum screen.

[0008] Preferably, the intermittent rotation mechanism includes a mounting base fixed on the frame, a driving shaft is rotatably mounted on the mounting base, a dial is fixedly mounted on one end of the driving shaft, the driving shaft is connected to the motor shaft of motor 1 through a pulley assembly, the end of the drum screen away from the feed port is connected to the groove wheel through an output shaft, a dial pin is provided on the dial, and the groove wheel and the dial constitute a groove wheel mechanism.

[0009] Preferably, the crushing mechanism includes a crushing chamber, which is fixed to the frame through a support frame, and fixed crushing teeth are provided on the left and right inner walls of the crushing chamber. Two mounting shafts are provided in the crushing chamber for parallel rotation, and a crushing tooth 1 is provided on the outer wall of one of the mounting shafts, and a crushing tooth 2 is provided on the outer wall of the other mounting shaft. The fixed crushing teeth, the crushing tooth 1 and the crushing tooth 2 are alternately distributed, and the two mounting shafts are meshed with each other through a connecting gear set, and one of the mounting shafts is drivingly connected to the output shaft of motor 2.

[0010] Preferably, the dredging mechanism includes a mounting plate fixed on the frame. A hydraulic cylinder is fixedly installed on the mounting plate. A connecting plate is fixedly installed at the output end of the hydraulic cylinder. A needle plate is detachably installed at the lower end of the connecting plate. The dredging needles on the needle plate correspond to the sieve holes on the sieve mesh.

[0011] Preferably, two guide shafts are fixedly installed at the upper end of the connecting plate. Two guide cylinders are fixedly arranged on the mounting plate. Each guide shaft is slidably installed up and down in one of the guide cylinders.

[0012] 3. Beneficial effects: Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects: Through the settings of the drum sieve, the intermittent rotation mechanism, the crushing mechanism and the dredging mechanism, the present invention integrates the three major functions of "screening - crushing - dredging" into the time sequence of the intermittent rotation of the drum sieve, forming a closed-loop processing flow of "rotating screening → pausing for dredging → crushing and then screening", forming a continuous sand and gravel separation processing flow, ensuring the long-term stable operation of the equipment, avoiding multiple transfers of materials, and improving production efficiency. The present invention has a high degree of automation, reduces manual intervention, reduces labor intensity, and improves the production efficiency and the reliability of equipment operation.

[0013] Through the setting of the intermittent rotation mechanism, the first motor drives the dial through the pulley assembly, and controls the drum sieve to present a periodic action of "rotation - pause" with the help of the Geneva mechanism. When rotating, sand and gravel screening and coarse sand lifting can be realized; when pausing, it provides an operation window for sieve hole dredging to avoid movement interference. The "rotating screening - pausing for dredging" rhythm of the drum sieve of the present invention is precisely controlled by the Geneva mechanism. The pause duration matches the sieve hole dredging requirement, avoiding sieve hole blockage caused by continuous rotation. The combination of the Geneva mechanism and the polygonal sieve drum breaks through the limitation of the continuous rotation of the traditional drum sieve, and realizes the dual optimization of "screening efficiency" and "dredging convenience". Brief description of the drawings

[0014] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the external structural schematic diagram of the present invention; Figure 3 is the overall structural schematic diagram of the present invention from another angle; Figure 4 is the structural schematic diagram of the drum mounting frame of the present invention; Figure 5 is the structural schematic diagram of the drum sieve of the present invention; Figure 6 is the structural schematic diagram of the material baffle of the present invention; Figure 7 is the structural schematic diagram of the intermittent rotation mechanism of the present invention; Figure 8 Structural schematic diagram of the crushing mechanism of the present invention; Figure 9 Structural schematic diagram of the dredging mechanism of the present invention; Figure 10 Structural schematic diagram of the screw conveyor of the present invention.

[0015] Reference numerals: 1. Drum mounting frame; 11. Lower frame body; 12. Upper frame body; 13. Bearing seat; 14. Rotating shaft; 15. Limiting wheel; 2. Drum screen; 21. Screen cylinder body; 22. Ring gear; 23. Material baffle; 3. Intermittent rotation mechanism; 31. Mounting seat; 32. Driving shaft; 33. Dial; 34. Motor 1; 35. Pulley assembly; 36. Grooved wheel; 37. Output shaft; 4. Crushing mechanism; 41. Crushing chamber; 42. Fixed crushing teeth; 43. Mounting shaft; 44. Crushing tooth 1; 45. Crushing tooth 2; 46. Connecting gear set; 47. Motor 2; 48. Support frame; 5. Dredging mechanism; 51. Mounting plate; 52. Hydraulic cylinder; 53. Connecting plate; 54. Needle plate; 55. Dredging needle; 56. Guide shaft; 57. Guide cylinder; 6. Deflector; 7. Screw conveyor; 8. Frame; 9. Collection box; 10. Protective cover. Detailed implementation manners

[0016] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0017] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0019] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", "provided with", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented using the prior art since they do not involve the design key points and improvement directions of the present invention, and thus will not be elaborated herein.

[0021] Embodiment: Referring to the attached Figures 1 to 10 , a sand and gravel separation device for sand making production, comprising a frame 8. A drum mounting frame 1, a screw conveyor 7, and a collection box 9 are sequentially arranged on the frame 8 from top to bottom. A drum screen 2 is horizontally arranged on the drum mounting frame 1. The drum screen 2 is fixed at the output end of an intermittent rotation mechanism 3. A crushing mechanism 4 is arranged inside the drum screen 2. A dredging mechanism 5 is arranged above the drum screen 2. The movable end of the dredging mechanism 5 faces the screen holes of the drum screen 2. A deflector 6 is arranged at one end of the drum screen 2 away from the intermittent rotation mechanism 3. The lower end of the deflector 6 is docked with the feed inlet of the screw conveyor 7. A protective cover 10 is arranged on the outer side of the frame 8. The protective cover 10 covers the outside of the device, preventing the exposed rotating parts from causing safety accidents, and at the same time reducing the diffusion of dust generated during the screening and crushing processes, meeting the requirements of industrial environmental protection.

[0022] The drum screen 2 includes a screen barrel body 21 arranged obliquely. The screen barrel body 21 is formed by sequentially splicing N pieces of screen meshes along the circumference, and its cross-section is a regular N-sided polygon, where N is a natural number greater than or equal to six. Each piece of screen mesh is provided with screen holes. A plurality of material baffles 23 are uniformly and fixedly arranged on the inner wall of the screen barrel body 21 along the circumference. The material baffles 23 are distributed along the axial direction of the screen barrel body 21. A placement space for accommodating sand and gravel is formed between the material baffles 23 and the inner wall of the screen barrel body 21. When the screen barrel body 21 rotates, when the material baffle 23 rotates to the upper position, the sand and gravel will slide down along the inclined surface of the material baffle 23 and enter the crushing mechanism 4; the regular N-sided polygon (N≥6) cross-section of the screen barrel makes the material contact the screen mesh more frequently during rotation. The inclined angle design of the material baffle 23 of about 30°-45° ensures that the coarse sand stably slides down to the crushing mechanism 4. This structure makes the material contact the screen mesh more frequently during the rotation of the drum screen 2, improving the screening efficiency.

[0023] The intermittent rotation mechanism 3 drives the drum screen 2 to rotate intermittently. After the sand and gravel enter the drum screen 2 through the deflector 6, the fine sand falls through the sieve holes, and the coarse sand is carried to the upper part by the material baffle 23 and then slides down to the internal crushing mechanism 4. At the same time, the dredging mechanism 5 dredges the sieve holes, and the fine sand falls into the screw conveyor 7 and is finally conveyed to the collection box 9.

[0024] The drum mounting frame 1 includes a lower frame body 11 and an upper frame body 12 arranged parallel to each other up and down. The lower frame body 11 and the upper frame body 12 are fixed on the frame 8. A bearing seat 13 is respectively fixed at each of the four corners of the top surface of the lower frame body 11. At the corresponding positions of the four corners of the bottom surface of the upper frame body 12 and the lower frame body 11, a bearing seat 13 is also provided. A rotating shaft 14 is rotatably installed between every two bearing seats 13 through bearings. A limit wheel 15 is respectively fixedly installed at both ends of each rotating shaft 14. The length direction of the rotating shaft 14 is arranged along the axial direction of the sieve drum body 21. Rolling rings 22 are respectively fixedly sleeved at the front and rear ends of the sieve drum body 21. The wheel surface of the limit wheel 15 is in rolling fit with the rolling ring 22. The limit wheel 15 is used to limit the radial displacement of the drum screen 2.

[0025] The intermittent rotation mechanism 3 includes a mounting seat 31 fixed on the frame 8. A driving shaft 32 is rotatably installed on the mounting seat 31. A dial 33 is fixedly installed at one end of the driving shaft 32. The driving shaft 32 is connected to the motor shaft of the first motor 34 through a pulley assembly 35. One end of the drum screen 2 away from the feed port is connected to a sprocket 36 through an output shaft 37. A dial pin is arranged on the dial 33. The sprocket 36 and the dial 33 form a sprocket mechanism.

[0026] The crushing mechanism 4 includes a crushing chamber 41. The crushing chamber 41 is fixed on the frame 8 through a support frame 48. Fixed crushing teeth 42 are arranged on the left and right inner walls of the crushing chamber 41. Two mounting shafts 43 are rotatably arranged in parallel in the crushing chamber 41. Crushing teeth one 44 are arranged on the outer wall of one mounting shaft 43, and crushing teeth two 45 are arranged on the outer wall of the other mounting shaft 43. The fixed crushing teeth 42, the crushing teeth one 44 and the crushing teeth two 45 are staggered. The two mounting shafts 43 are meshed and driven with each other through a connecting gear set 46. One of the mounting shafts 43 is in transmission connection with the output shaft of the second motor 47.

[0027] The dredging mechanism 5 includes a mounting plate 51 fixed on the frame 8. A hydraulic cylinder 52 is fixedly installed on the mounting plate 51. A connecting plate 53 is fixedly installed at the output end of the hydraulic cylinder 52. A needle plate 54 is detachably installed at the lower end of the connecting plate 53. The dredging needles 55 on the needle plate 54 correspond to the sieve holes on the sieve mesh. Two guide shafts 56 are fixedly installed at the upper end of the connecting plate 53. Two guide cylinders 57 are fixedly arranged on the mounting plate 51. Each guide shaft 56 is slidably installed up and down in a guide cylinder 57.

[0028] Working principle: First, start the second motor 47 to drive the first crushing tooth 44 and the second crushing tooth 45 to rotate. Then, start the first motor 34 to drive the drive shaft 32 to rotate through the pulley assembly 35. The pin on the dial 33 starts to toggle the Geneva wheel 36, and the drum sieve 2 enters the intermittent rotation state. The sand and gravel materials to be processed are conveyed to the deflector 6 through an external conveying device such as a belt conveyor. The deflector 6 is inclined, and the low end is butted against the feed port of the drum sieve 2. The materials slide along the deflector into the inside of the sieve drum body 21. Part of the sand and gravel materials enter the drum sieve 2, and the other part enters the crushing mechanism 4.

[0029] When the pin on the dial 33 inserts into the notch of the Geneva wheel 36, the Geneva wheel mechanism drives the drum sieve 2 to rotate clockwise, and the sieve drum body 21 starts to rotate. Due to the inclination of the sieve drum body 21, the fine sand directly falls through the sieve holes on the sieve mesh under the action of gravity and falls into the spiral conveyor 7 below. The material baffle 23 on the inner wall of the sieve drum body 21 rotates with the sieve drum body 21 and lifts the coarse sand materials that have not been sieved downwards.

[0030] The number of notches is also N. In this embodiment, N = 8. When the pin on the dial 33 disengages from the notch of the Geneva wheel 36, the drum sieve 2 stops rotating. At this time, the sieve drum body 21 is in a short-term static state. When the drum sieve 2 stops rotating (during the intermittent pause), the control system triggers the hydraulic cylinder 52 to extend, pushing the connecting plate 53 to move downward. The dredging needles 55 (corresponding to the sieve holes one by one) on the needle plate 54 vertically insert into the sieve holes of the sieve mesh to remove the sand and gravel or mud blocks blocked in the holes. After the dredging is completed, the hydraulic cylinder 52 retracts, driving the needle plate 54 to rise and reset. The guide shaft 56 slides in the guide cylinder 57 to ensure the smooth movement of the needle plate 54 and avoid offset and damage to the sieve mesh. During the rotation of the drum sieve 2, the coarse sand (sand and gravel with a particle size larger than the sieve holes) is blocked by the material baffle 23 and is lifted above the drum sieve 2 along with the material baffle 23. Since the material baffle 23 is inclined, the coarse sand slides along the surface of the material baffle 23 and falls into the internal crushing mechanism 4.

[0031] The sliding coarse sand enters the crushing chamber 41. The second motor 47 drives one of the mounting shafts 43 to rotate clockwise, and drives the other mounting shaft 43 to rotate counterclockwise through the connecting gear set 46. The first crushing tooth 44 and the second crushing tooth 45 are staggered and form multiple crushing points with the fixed crushing tooth 42. The coarse sand is crushed under the extrusion and shearing action of the fixed crushing tooth 42, the first crushing tooth 44 and the second crushing tooth 45, and the particle size is gradually reduced to fine sand that meets the requirements. The crushed fine sand falls from the bottom opening of the crushing chamber 41 and enters the spiral conveyor 7 through the sieve holes of the sieve drum body 21. The fine sand after screening and crushing falls into the feed port of the spiral conveyor 7. The spiral blade rotates under the drive of the motor and conveys the fine sand axially to the discharge port. The fine sand falls from the discharge port of the spiral conveyor into the collection box 9, completing the entire separation and treatment process. The collection box can be replaced regularly or further transported through an external conveying device. The dial 33 rotates continuously and periodically turns the groove wheel 36, so that the drum screen 2 works in a cycle according to the rhythm of "rotation-pause-rotation", and cooperates with the periodic actions of the crushing mechanism 4 and the dredging mechanism 5 to form a continuous sand and gravel separation process. The intermittent rotation (screening + pause) of the drum screen 2 is strictly synchronized with the action of the dredging mechanism 5, and the screen holes are dredged during the pause to avoid interference with material screening. This technical solution realizes the integrated processing of "coarse sand crushing and reuse + fine sand efficient collection" and improves the sand production efficiency.

[0032] The above-described embodiments only express a certain implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A sand and gravel separation device for sand production, comprising a frame (8), characterized in that: The frame (8) is provided with a drum mounting frame (1), a screw conveyor (7) and a collecting box (9) in order from top to bottom. A drum screen (2) is horizontally provided on the drum mounting frame (1). The drum screen (2) is fixed to the output end of the intermittent rotating mechanism (3). A crushing mechanism (4) is provided inside the drum screen (2). A dredging mechanism (5) is provided above the drum screen (2). The movable end of the dredging mechanism (5) faces the sieve holes of the drum screen (2). A guide plate (6) is provided at one end of the drum screen (2) away from the intermittent rotating mechanism (3). The lower end of the guide plate (6) is connected to the feed port of the screw conveyor (7). A protective cover (10) is provided on the outer side of the frame (8).

2. The sand and gravel separation equipment for sand making production according to claim 1, wherein: The drum screen (2) comprises a screen drum body (21) arranged obliquely, the screen drum body (21) being formed by N screens being spliced in sequence along the circumferential direction, and having a cross section in the form of a regular N-polygon, where N is a natural number greater than or equal to six, and each of the screens is provided with a screen hole, and the inner wall of the screen drum body (21) is evenly and fixedly provided with a plurality of material baffles (23) along the circumferential direction, the material baffles (23) being distributed along the axial direction of the screen drum body (21), and a placement space for accommodating sand and gravel is formed between the material baffles (23) and the inner wall of the screen drum body (21), and when the screen drum body (21) rotates and the material baffles (23) rotate to an upper position, the sand and gravel will slide along the inclined surface of the material baffles (23) and enter the crushing mechanism (4); The intermittent rotation mechanism (3) drives the drum screen (2) to rotate intermittently. After the sand and gravel enter the drum screen (2) through the guide plate (6), the fine sand falls through the screen holes, and the coarse sand is carried upward by the material baffle (23) and slides to the internal crushing mechanism (4). At the same time, the dredging mechanism (5) dredges the screen holes, and the fine sand falls into the screw conveyor (7) and is finally transported to the collection box (9).

3. A sand and gravel separation device for sand production according to claim 2, characterized in that: The drum mounting frame (1) comprises a lower frame body (11) and an upper frame body (12) which are arranged in parallel up and down. The lower frame body (11) and the upper frame body (12) are fixed on the frame (8). A bearing seat (13) is fixedly arranged on each of the four corners of the top surface of the lower frame body (11). A bearing seat (13) is also arranged at each of the four corners of the bottom surface of the upper frame body (12) at positions corresponding to the lower frame body (11). A rotating shaft (14) is rotatably mounted between every two of the bearing seats (13) via a bearing. A limiting wheel (15) is fixedly mounted on each of the two ends of each rotating shaft (14). The length direction of the rotating shaft (14) is arranged along the axial direction of the screen drum body (21). Rolling rings (22) are fixedly sleeved on the front and rear ends of the screen drum body (21). The wheel surface of the limiting wheel (15) is in rolling contact with the rolling ring (22). The limiting wheel (15) is used to limit the radial displacement of the drum screen (2).

4. A sand and gravel separation device for sand making production according to claim 2, characterized in that: The intermittent rotation mechanism (3) comprises a mounting seat (31) fixed on the frame (8), a driving shaft (32) being rotatably mounted on the mounting seat (31), a dial (33) being fixedly mounted on one end of the driving shaft (32), the driving shaft (32) being connected to a motor shaft of a motor 1 (34) via a pulley assembly (35), the end of the drum screen (2) away from the feed port being connected to a grooved wheel (36) via an output shaft (37), a dial pin being provided on the dial (33), and the grooved wheel (36) and the dial (33) forming a grooved wheel mechanism.

5. The sand and gravel separation equipment for sand making production according to claim 2, wherein: The crushing mechanism (4) comprises a crushing chamber (41), wherein the crushing chamber (41) is fixed to the frame (8) via a support frame (48), fixed crushing teeth (42) are arranged on the left and right inner walls of the crushing chamber (41), two mounting shafts (43) are arranged in parallel and rotatable in the crushing chamber (41), one of the mounting shafts (43) is provided with a crushing tooth 1 (44) on its outer wall, and the other of the mounting shafts (43) is provided with a crushing tooth 2 (45) on its outer wall, the fixed crushing teeth (42), the crushing teeth 1 (44) and the crushing teeth 2 (45) are arranged alternately, the two mounting shafts (43) are meshed with each other for transmission via a connecting gear set (46), and one of the mounting shafts (43) is drivingly connected to an output shaft of a second motor (47).

6. The sand and gravel separation equipment for sand making production according to claim 2, characterized in that: The dredging mechanism (5) comprises a mounting plate (51) fixed on the frame (8), a hydraulic cylinder (52) being fixedly mounted on the mounting plate (51), a connecting plate (53) being fixedly mounted on the output end of the hydraulic cylinder (52), a needle plate (54) being detachably mounted on the lower end of the connecting plate (53), and dredging needles (55) on the needle plate (54) corresponding to the sieve holes on the sieve.

7. A sand and gravel separation device for sand production according to claim 6, characterized in that: Two guide shafts (56) are fixedly mounted on the upper end of the connecting plate (53), and two guide cylinders (57) are fixedly arranged on the mounting plate (51). Each guide shaft (56) is slidably mounted in one of the guide cylinders (57) up and down.

Images