A sand making equipment and method with controllable stone powder content

Abstract

This invention relates to the field of sand making technology, specifically to a sand making device with controllable stone powder content. The device includes a return conveyor tailstock, a sand making structure on the side of the tailstock, a primary filtration structure inside the tailstock, and a secondary filtration structure on the side of the tailstock away from the primary filtration structure. The stone powder is initially filtered by the up-and-down vibration of a moving block. When a specific size needs to be filtered out, the pneumatic bar valve moves, driving the inverted V-shaped guide plate to a parallel state. At this time, the first telescopic plate continues to move, changing the parallel guide plate into a regular V-shape, causing the stone powder on the guide plate to contact the interior of the return conveyor tailstock. This reduces the volume and irregularity of the splashed stone powder through collisions, and accelerates the guidance of the stone powder towards the pneumatic bar valve for filtration, thus improving production efficiency and the filtration effect of the pneumatic bar valve.

Description

Technical Field

[0001] This invention relates to the field of sand making technology, and more specifically, to a sand making equipment and method with controllable stone powder content. Background Technology

[0002] Coal preparation, also known as coal washing, is the process of separating clean coal from raw coal to meet the quality requirements of users. In the field of mineral resources, stone powder sand making refers to the process of converting stone powder into manufactured sand through a series of processes. Stone powder sand making is the key equipment in this process. It processes stone powder into sand particles of different sizes through crushing, screening, and powder selection.

[0003] Currently, stone powder needs to be screened to select suitable powder before it can be used for sand making. This process involves initial filtration using a screen, followed by adjusting the distance of a pneumatic bar valve. The filtered stone powder is then guided to the adjusted valve for secondary filtration. Unsuitable powder is returned to a pre-placed storage tank, while suitable powder enters the sand making equipment. However, when smaller pieces of stone powder are required, the secondary filtration equipment needs to have its gaps adjusted to a smaller size. If the stone powder from the initial filtration flows into the secondary filtration equipment with its smaller gaps, it can easily accumulate near the equipment, making it difficult to quickly separate the required powder for the sand making process. Summary of the Invention

[0004] The purpose of this invention is to provide a sand making equipment and method with controllable stone powder content, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, one of the objectives of this invention is to provide a sand making device with controllable stone powder content, including a return conveyor tail frame, a sand making structure provided on the side of the return conveyor tail frame, a primary filtration structure provided inside the return conveyor tail frame, and a secondary filtration structure provided on the side of the return conveyor tail frame away from the primary filtration structure.

[0006] When the stone powder only needs to be filtered once, the primary filtration structure is driven by the cylinder to reciprocate to filter the stone powder for the first time, while the secondary filtration structure is driven to shake and discharge the stone powder filtered in the first time.

[0007] When the stone powder needs secondary filtration, the secondary filtration structure moves to a parallel state, and then the primary filtration structure is driven by the cylinder to reciprocate to filter the stone powder for the first time. The secondary filtration structure is then driven to lift the stone powder and crush it in contact with the tail frame of the return conveyor belt. The crushed stone powder is then filtered through the secondary filtration structure.

[0008] Preferably, the primary filtration structure includes a linear vibrating screen, which is slidably connected inside the tailstock of the return conveyor belt. Two sets of moving blocks are fixedly connected to both sides of the linear vibrating screen, and the two sets of moving blocks are slidably connected inside the tailstock of the return conveyor belt. Two sets of telescopic columns are fixedly connected inside the two sets of moving blocks. Two sets of cylinders are fixedly connected to the ends of the two sets of telescopic columns away from the two sets of moving blocks. A first telescopic plate is fixedly connected to the inner side of the tailstock of the return conveyor belt. Two sets of linear sliding grooves are symmetrically opened on the inner side of the tailstock of the return conveyor belt near the first telescopic plate. A collection hopper is fixedly connected to the bottom of the tailstock of the return conveyor belt. A buffer plate is provided inside the collection hopper, and the surface of the buffer plate is fixedly connected to the cylinder.

[0009] The secondary filtration structure includes a pneumatic bar valve, which consists of a pneumatic valve and a bar. The pneumatic valve is fixedly connected to the surface of the tailstock of the return conveyor. The bar of the pneumatic bar valve passes through the bottom of the tailstock of the return conveyor and is fixedly connected to a screen plate. A second telescopic plate is fixedly connected to the side of the screen plate. Two guide plates are slidably connected to the side of the second telescopic plate away from the screen plate. Two sets of limiting grooves are symmetrically opened on the side of the second telescopic plate away from the screen plate. A vertical sliding groove is opened in the middle of the side of the second telescopic plate away from the screen plate.

[0010] The second telescopic plate is divided into a telescopic frame and a rectangular plate. The telescopic frame of the second telescopic plate is fixedly connected to the inner side of the tail frame of the return conveyor belt. The rectangular plate of the second telescopic plate is fixedly connected to the side of the screen plate. The rectangular plate of the second telescopic plate is slidably connected to the telescopic frame.

[0011] When the pneumatic bar valve is not in motion, the screen plate and the second telescopic plate fixed at the bottom of the pneumatic bar valve bar are located on the inner side near the tail frame of the return conveyor. At this time, the guide plate is in an inverted V shape and has a gap with the inner side of the collection hopper. When the pneumatic bar valve is in motion, the screen plate and the second telescopic plate fixed at the bottom of the pneumatic bar valve bar are located on the inner side near the collection hopper. At this time, the guide plate is in a parallel state and is tightly attached to the inner side of the collection hopper.

[0012] When the guide plate is in an inverted V-shape, the two sides of the guide plate are far apart from the inner side of the tail frame of the return conveyor. At this time, the linear vibrating screen and the first telescopic plate move to discharge the stone powder received by the guide plate. When the guide plate is in a parallel state, the two sides of the guide plate are close to the inner side of the tail frame of the return conveyor. At this time, the linear vibrating screen and the first telescopic plate move to impact and crush the stone powder received by the guide plate.

[0013] Large and small movable columns are provided between the two guide plates and on both sides. The small movable columns on both sides of the two guide plates are adapted to the straight slide groove. The end of the small movable column on both sides of the two guide plates away from the straight slide groove is adapted to the vertical slide groove.

[0014] The buffer plate inside the hopper has several sets of holes. The buffer plate is made of soft material. The inside of the hopper is hollow. The inner side of the hopper is fixedly connected to both sides of the second telescopic plate. The height of the second telescopic plate is adapted to the screen plate.

[0015] The second objective of this invention is to provide a sand-making method for achieving controllable stone powder content, comprising the following steps:

[0016] Step 1: Ensure the guide plate is functioning properly and that the inside of the return conveyor tailstock is clean and free of blockages.

[0017] Step 2: Pour the stone powder onto the surface of the linear vibrating screen and start the cylinder to drive the linear vibrating screen to reciprocate to filter the stone powder for the first time, and receive it on the surface of the guide plate.

[0018] Step 3: The guide plate vibrates, quickly discharging the stone powder collected from the initial filtration from the collection hopper;

[0019] Step 4: When secondary filtration is required, activate the pneumatic bar valve to adjust to the required size and make it parallel to the guide plate;

[0020] Step 5: Pass the stone powder initially filtered by the linear vibrating screen through the pneumatic bar valve to complete the secondary filtration.

[0021] Step Six: The stone powder that has passed through the pneumatic bar valve for secondary filtration is discharged into the sand making machine to make sand, and the stone powder content is made under control.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. In this sand making equipment with controllable stone powder content, the moving blocks and telescopic columns continuously slide on the surface of the return conveyor tail frame, driving the linear vibrating screen to vibrate up and down repeatedly. This can quickly remove and filter the stone powder that is blocked in the linear vibrating screen. Then, by activating the pneumatic bar valve and adjusting the required size gap, the stone powder that has passed through the linear vibrating screen for the first time can be filtered again to the required size, which is convenient for subsequent stone powder sand making and ensures the quality and size of the stone powder before sand making.

[0024] 2. In this sand making equipment with controllable stone powder content, when there is no need to filter to a specified size, the stone powder is initially filtered by the up-and-down vibration of the moving block, while driving the inverted V-shaped guide plate to move synchronously. This not only guides the stone powder after the initial filtration to the direction of the pneumatic bar valve in different areas, but also quickly guides the stone powder after the initial filtration out.

[0025] When a specified size needs to be filtered out, the pneumatic bar valve moves and drives the inverted V-shaped guide plate to a parallel state. At this time, the first telescopic plate continues to move, which can change the parallel guide plate into a regular V-shape, so that the stone powder on the guide plate comes into contact with the inside of the return conveyor tail frame. On the one hand, the splashed stone powder collides with each other to reduce its volume and irregularity, and on the other hand, it accelerates the guidance of the stone powder to the direction of the pneumatic bar valve for filtration, which helps to improve production efficiency and improve the filtration effect of the pneumatic bar valve. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure assembly of the present invention;

[0027] Figure 2 This is a sectional perspective view of the tailstock of the return conveyor belt of the present invention;

[0028] Figure 3 This is a partial schematic diagram of the initial filtration structure of the present invention;

[0029] Figure 4 This is a three-dimensional cross-sectional view of the primary and secondary filtration structures of the present invention.

[0030] Figure 5 This is a schematic diagram of the primary filtration structure of the present invention, which removes the linear vibrating screen.

[0031] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0032] Figure 7 This is a schematic diagram showing the connection relationship between the guide plate and the first telescopic plate of the present invention.

[0033] Figure 8 This is a schematic diagram showing the disassembled structure of the linear chute and guide plate of the present invention;

[0034] Figure 9 This is a schematic diagram showing the disassembled structure of the second telescopic plate and the guide plate of the present invention;

[0035] Figure 10 This is a schematic diagram of the overall structure of the present invention without any movement.

[0036] Figure 11 This is a schematic diagram of the overall structure of the present invention after it has been in motion.

[0037] The meanings of the labels in the diagram are as follows:

[0038] 1. Return conveyor tail frame; 2. Sand making machine; 300. Primary filtration structure; 301. Linear vibrating screen; 302. Moving block; 303. Telescopic column; 304. Collection hopper; 305. Buffer plate; 306. First telescopic plate; 307. Linear chute; 400. Secondary filtration structure; 401. Pneumatic bar valve; 402. Guide plate; 403. Screen chute; 404. Second telescopic plate; 405. Limiting groove; 406. Vertical chute; 5. Cylinder. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Before sand making equipment can be used, suitable stone powder needs to be screened out. Especially when filtering out a specific amount of stone powder, the screening equipment needs to be adjusted to a specific gap. If stone powder continuously flows into the filtration equipment, it easily accumulates on the surface, making it impossible to effectively and quickly screen out the stone powder required for sand making. Therefore, this invention provides a sand making equipment with controllable stone powder content. One embodiment of this invention is shown in the following figure. Figures 1-11 It includes a return conveyor tail frame 1, a sand making machine 2 is installed on the side of the return conveyor tail frame 1, a primary filtration structure 300 is installed inside the return conveyor tail frame 1, and a secondary filtration structure 400 is installed on the side of the return conveyor tail frame 1 away from the primary filtration structure 300.

[0041] When the stone powder only needs to be filtered initially, the secondary filter structure 400 is in a non-moving state. Then, the primary filter structure 300 is driven by the cylinder 5 to reciprocate to filter the stone powder initially, while simultaneously driving the secondary filter structure 400 to shake and discharge the stone powder filtered initially.

[0042] When stone powder needs primary and secondary filtration, the secondary filtration structure 400 is in a parallel state. Then, the primary filtration structure 300 is driven by the cylinder 5 to reciprocate to filter the stone powder for the first time. At the same time, the secondary filtration structure 400 is driven to lift the stone powder and crush it in contact with the tail frame 1 of the return conveyor belt. The crushed stone powder is then filtered through the secondary filtration structure 400.

[0043] The present invention is as follows Figures 2-6Currently, the screening device before stone powder sand making filters in two ways: one is to filter out stone powder of 50mm, and the other is to filter out stone powder of a specified size below 50mm. This is because the existing sand making machine requires a stone powder feed particle size between 30mm and 50mm. If the feed particle size is too large, such as exceeding 50mm, the stone powder cannot be sufficiently accelerated and effectively projected within the sand making machine, resulting in poor crushing effect and failure to achieve the expected finished product particle size requirement. Therefore, by using the moving block 302 and the telescopic column 303 to continuously move the material at the tail of the return conveyor belt 1... The surface slides and drives the linear vibrating screen 301 to vibrate up and down, which can quickly drop and filter the stone powder that is blocked in the linear vibrating screen 301. When there is no need to filter the specified stone powder a second time, the initial state of the guide plate 402 is an inverted V shape, and the two sides of the inverted V-shaped guide plate 402 will have gaps with the inner side of the return conveyor tail frame 1. Therefore, the stone powder filtered by the linear vibrating screen 301 will be guided from the inverted V-shaped guide plate 402 to the inside of the collection hopper 304 and protected by the buffer plate 305 until it reaches the storage box prepared in advance outside, thus completing the filtration of stone powder smaller than 50mm.

[0044] Next, considering that when the sand making machine needs to specify stone powder, such as filtering out stone powder smaller than 50mm, the inverted V-shaped guide plate 402 would guide the stone powder into the collection hopper 304 and prevent it from undergoing secondary filtration. Therefore, the screen plate 403 fixed by the bar of the pneumatic bar valve 401 is moved and driven to make the inverted V-shaped guide plate 402 parallel. The gaps on both sides of the parallel guide plate 402 will not be exposed, so the parallel guide plate 402 can normally complete the function of guiding stone powder. At this time, when the first telescopic plate 306 is driven by the linear vibrating screen 301 to continue moving, it can change the parallel guide plate 402 into a positive V-shape, so that the stone powder on the guide plate 402 contacts the inside of the return conveyor tail frame 1. On the one hand, it reduces the volume and irregularity of the splashed stone powder by collision, and on the other hand, it accelerates the guidance of the stone powder to the direction of the pneumatic bar valve 401 for filtration, which is beneficial to improve production efficiency and improve the filtration effect of the pneumatic bar valve 401.

[0045] This section describes the working principle of the sand making machine 2, which is well known to those skilled in the art, such as an impact crusher. Its working principle involves using a high-speed rotating impeller or rotor to accelerate and eject materials, causing them to collide and rub against each other, thus crushing and shaping them. The feed particle size of an impact crusher is generally required to be between 30mm and 50mm. Therefore, particles smaller than 50mm are collected from the storage box prepared beforehand below the collecting hopper 304 and then poured into the sand making machine 2. When a specific amount of stone powder needs to be filtered out, it will pass through a secondary filtration structure 400 and be guided into the sand making machine 2. This ensures the crushing effect and production efficiency of the sand making machine, enabling it to stably produce manufactured sand that meets the particle size requirements.

[0046] Based on the above, it is necessary to disclose in detail the specific structure and operation process of the first-case filter:

[0047] First, you need to filter out stone powder smaller than 50mm (i.e., the first scenario). Please refer to [the documentation / reference]. Figures 1-6 The primary filtration structure 300 includes a linear vibrating screen 301, which is slidably connected inside the tail frame 1 of the return conveyor belt. Two sets of moving blocks 302 are fixedly connected to both sides of the linear vibrating screen 301. The two sets of moving blocks 302 are slidably connected inside the tail frame 1 of the return conveyor belt. Two sets of telescopic columns 303 are fixedly connected inside the two sets of moving blocks 302. Two sets of cylinders 5 are fixedly connected to the ends of the two sets of telescopic columns 303 away from the two sets of moving blocks 302. A first telescopic plate 306 is fixedly connected to the inner side of the tail frame 1 of the return conveyor belt. Two sets of linear sliding grooves 307 are symmetrically opened on the inner side of the tail frame 1 of the return conveyor belt near the first telescopic plate 306. A collection hopper 304 is fixedly connected to the bottom of the tail frame 1 of the return conveyor belt. A buffer plate 305 is provided inside the collection hopper 304. The surface of the buffer plate 305 is fixedly connected to the cylinders 5.

[0048] Workers pour stone powder onto the surface of the linear vibrating screen 301, and then start the cylinder 5, causing the telescopic column 303, which is fixedly connected to the output end of the cylinder 5, to move up and down reciprocally, and simultaneously drive the moving block 302 to move. At this time, the movement of the moving block 302 will drive the linear vibrating screen 301 to move up and down reciprocally inside the tail frame 1 of the return conveyor belt, so that the stone powder of different sizes received on the surface of the linear vibrating screen 301 will quickly vibrate and fall into the tail frame 1 of the return conveyor belt, thus achieving the initial filtration of stone powder, that is, filtering out stone powder <50mm.

[0049] This explains that the linear vibrating screen 301 is set as a single-layer screen with a mesh size of 50mm*50mm. This is because, as mentioned above, the feed particle size requirement for the sand making equipment is between 30mm and 50mm. Therefore, the mesh size is set to 50mm*50mm in order to ensure that the stone powder filtered in the first stage meets the sand making requirements as much as possible.

[0050] To filter out stone powder smaller than 50mm from the first case, discharge it into the pre-prepared storage box in collecting hopper 304, and then pour it into the sand making machine 2, the following detailed structure needs to be disclosed. Please refer to [the relevant documentation]. Figures 4-9The secondary filtration structure 400 includes a pneumatic bar valve 401, which consists of a pneumatic valve and a bar. The pneumatic valve of the pneumatic bar valve 401 is fixedly connected to the surface of the tail frame 1 of the return conveyor belt. The bar of the pneumatic bar valve 401 passes through the bottom of the tail frame 1 of the return conveyor belt and is fixedly connected to a screen plate 403. A second telescopic plate 404 is fixedly connected to the side of the screen plate 403. A guide plate 402 is slidably connected to the side of the second telescopic plate 404 away from the screen plate 403. Two sets of limiting grooves 405 are symmetrically opened on the side of the second telescopic plate 404 away from the screen plate 403. A vertical sliding groove 406 is opened in the middle of the side of the second telescopic plate 404 away from the screen plate 403.

[0051] This section explains the positional relationship between the guide plate 402 and the collection hopper 304 in different states, to facilitate understanding of the guide plate 402 in different states mentioned below. When the pneumatic bar valve 401 is not in motion, the screen chute 403 and the second telescopic plate 404 fixed at the bottom of the pneumatic bar valve 401 are located on the inner side close to the tail frame 1 of the return conveyor. At this time, the guide plate 402 is in an inverted V shape and a gap is formed with the inner side of the collection hopper 304. The linear vibrating screen 301 and the first telescopic plate 306 move to discharge the stone powder received by the guide plate 402.

[0052] Please refer to the structure and state mentioned in the two paragraphs above. Since the linear vibrating screen 301 has initially filtered out stone powder <50mm, the inverted V-shaped guide plate 402 mentioned above will receive the stone powder filtered in the first stage. Because the guide plate 402 is in an inverted V shape, the two sides of the guide plate 402 are far away from the inner side of the return conveyor tail frame 1 (i.e., there is a gap). Therefore, when the guide plate 402 receives the stone powder filtered in the first stage, it will fall from the gap between the guide plate 402 and the collection hopper 304 and be guided into the inside of the collection hopper 304 and contact the buffer plate 305 for buffering. Then it will fall from the opening of the collection hopper 304 into the pre-prepared storage box and then be poured into the sand making machine 2, so as to achieve the screening of stone powder <50mm in the sand making equipment.

[0053] This section describes the detailed motion process of the guide plate 402 being shaken to improve the guiding effect before it guides the stone powder into the collection hopper 304. When the inverted V-shaped guide plate 402 normally guides the stone powder that was initially filtered, the linear vibrating screen 301 reciprocates normally to filter the stone powder for the first time. This will simultaneously drive the first telescopic plate 306 to move. The first telescopic plate 306 will drive the inverted V-shaped guide plate 402 to shake, so that the stone powder that was initially filtered by the guide plate 402 is quickly discharged from the gap between the guide plate 402 and the collection hopper 304. At this time, the second telescopic plate 404, which is not moving, is in the inner cavity of the return conveyor tail frame 1, forming a closed inner cavity. This setting prevents the stone powder that was initially filtered from passing through the secondary filtration structure 400.

[0054] To filter stone powder to a specified size (i.e., the second case), the following detailed structure needs to be disclosed. Please refer to [reference needed]. Figures 2-6 When the pneumatic bar valve 401 moves, the screen plate 403 and the second telescopic plate 404 fixed at the bottom of the bar of the pneumatic bar valve 401 are located on the inner side close to the collection hopper 304. At this time, the guide plate 402 is in a parallel state and is tightly attached to the inner side of the collection hopper 304. When the guide plate 402 is in a parallel state, the two sides of the guide plate 402 are close to the inner side of the tail frame 1 of the return conveyor belt. At this time, the linear vibrating screen 301 and the first telescopic plate 306 move to impact and crush the stone powder received by the guide plate 402.

[0055] The connection and positional relationship of the guide plate 402 will be described in detail here to facilitate understanding of the movement process of the guide plate 402 deforming into a parallel state. Large and small movable columns are provided between the two guide plates 402 and on both sides. The small movable columns on both sides of the two guide plates 402 are adapted to the straight slide 307. The end of the small movable column on both sides of the two guide plates 402 away from the straight slide 307 is adapted to the straight slide 307. The large movable column between the two guide plates 402 is abutted against the inner side of the tail frame 1 of the return conveyor belt. The large movable column between the two guide plates 402 is adapted to the vertical slide 406. The second telescopic plate 404 is divided into a telescopic frame and a rectangular plate. The telescopic frame of the second telescopic plate 404 is fixedly connected to the inner side of the tail frame 1 of the return conveyor belt. The rectangular plate of the second telescopic plate 404 is fixedly connected to the side of the screen plate 403. The rectangular plate of the second telescopic plate 404 is slidably connected to the telescopic frame.

[0056] Please refer to the structure and state of the two paragraphs above for the following information. Figures 8-11 The process of filtering stone powder to a specified size in the second case is described below (the following will take the filtering of stone powder <30mm as an example). When the stone powder filtered by the initial filter structure 300 cannot meet the requirements of the sand making machine 2, the operator starts the pneumatic bar valve 401 to adjust the bar gap in the pneumatic bar valve 401 to between 32mm and 35mm. (This describes the working principle of the pneumatic bar valve 401, which is well known in this technical field. When the material flow needs to be cut off or the flow rate needs to be adjusted according to the working conditions, the bars need to be inserted one by one through the pneumatic valve. When the bars are inserted into the frame, the bars form a parallel grid plate, blocking the blocky material on one side of the gate, thereby preventing the material flow. In addition, the gap between the bars can be adjusted according to specific needs to control the material flow rate and the size of the material passing through, so as to meet different production process requirements.)

[0057] The setting of the bar between 32mm and 35mm, which is larger than the required stone powder, allows the stone powder to flow smoothly. This drives the bar in the pneumatic bar valve 401 and the fixed screen plate 403 to move towards the inside of the collection hopper 304. At the same time, it drives the rectangular plate of the second telescopic plate 404 to slide in the telescopic frame and move towards the inside of the collection hopper 304. After the rectangular plate of the second telescopic plate 404 has moved a certain distance, the vertical groove 406 opened on the side of the second telescopic plate 404 near the guide plate 402 will abut against the large movable column in the guide plate 402 and move towards the inside of the collection hopper 304. When the large movable column in the guide plate 402 moves, the small movable column in the guide plate 402 will slide in the limiting groove 405 opened in the telescopic frame of the second telescopic plate 404, so that the inverted V-shaped guide plate 402 becomes a parallel guide plate 402.

[0058] At the same time, when the guide plate 402 becomes parallel, the screen plate 403 is parallel to the height of the guide plate 402 (forming a straight guide plate), and the two sides of the guide plate 402 are in contact with the inner cavity of the collection hopper 304, so that the stone powder filtered by the primary filtration structure 300 is guided to the pneumatic bar valve 401 for secondary filtration.

[0059] This section describes the crushing process performed when the guide plate 402 guides the stone powder from the initial filtration. This is because larger stone powder (i.e., >30mm) cannot pass through the pneumatic bar valve 401 when the guide plate 402 is guiding the powder. Therefore, the larger stone powder needs to be crushed to facilitate filtration through the pneumatic bar valve 401. The following describes the crushing process: When the guide plate 402 is in a parallel state, the reciprocating linear vibrating screen 301 moves towards the inside of the collection hopper 304, driving the first telescopic plate 306 downwards. Simultaneously, this causes the parallel guide plate 402 to change into a V-shape. When the linear vibrating screen 301 moves away from the inside of the collection hopper 304, it drives the first telescopic plate 306 to move upward, causing the V-shaped guide plate 402 to become a parallel guide plate 402. During the continuous switching between the two, the stone powder received by the guide plate 402 can be lifted and come into contact with the inner side of the tail frame 1 of the return conveyor belt. This not only enables the stone powder of the first filtration to be quickly guided to the pneumatic bar valve 401, but also crushes the stone powder of the first filtration by impact, so that the stone powder >30mm is crushed into the gap set by the bar of the pneumatic bar valve 401, thereby improving the stone powder filtration effect.

[0060] Meanwhile, after filtering stone powder <30mm, it will be guided to the sand making machine 2 for sand making. When the stone powder that has not passed through the pneumatic bar valve 401 (i.e. stone powder >30mm) is finished filtering, the pneumatic bar valve 401 will be activated to reset, so that the parallel guide plate 402 becomes the inverted V-shaped guide plate 402, guiding the unfiltered stone powder to the collection box prepared in advance in the collection hopper 304.

[0061] The second aspect of this invention is for achieving sand production with controllable stone powder content, comprising the following steps:

[0062] Step 1: Ensure that the guide plate 402 is working properly, and at the same time ensure that the inside of the return conveyor tail frame 1 is clean and free of blockages;

[0063] Step 2: Pour the stone powder onto the surface of the linear vibrating screen 301 and start the cylinder 5 to drive the linear vibrating screen 301 to reciprocate to filter the stone powder for the first time, and receive it on the surface of the guide plate 402.

[0064] Step 3: The guide plate 402 vibrates, quickly discharging the stone powder that received the initial filtration from the collection hopper 304.

[0065] Step 4: When secondary filtration is required, activate the pneumatic bar valve 401 to adjust to the required size and make it parallel to the guide plate 402;

[0066] Step 5: Pass the stone powder initially filtered by the linear vibrating screen 301 through the pneumatic bar valve 401 for secondary filtration.

[0067] Step 6: The stone powder that has passed through the pneumatic bar valve 401 for secondary filtration is discharged into the sand making machine 2 for sand making, and the stone powder content is made controllable.

[0068] Working principle: The worker pours stone powder onto the surface of the linear vibrating screen 301, and then starts the cylinder 5, which causes the telescopic column 303 fixedly connected to the output end of the cylinder 5 to move up and down, and simultaneously drives the moving block 302 to move. At this time, the movement of the moving block 302 will drive the linear vibrating screen 301 to move up and down inside the tail frame 1 of the return conveyor belt, so that the stone powder of different sizes on the surface of the linear vibrating screen 301 will quickly vibrate and fall into the tail frame 1 of the return conveyor belt.

[0069] When the sand making equipment needs to filter stone powder <50mm, since the linear vibrating screen 301 has already filtered out stone powder <50mm in the first stage, the inverted V-shaped guide plate 402 set inside the tail frame 1 of the return conveyor will receive the stone powder filtered in the first stage. Since the guide plate 402 is in the inverted V shape, the two sides of the guide plate 402 are far away from the inner side of the tail frame 1 of the return conveyor (i.e., there is a gap). Therefore, when the guide plate 402 receives the stone powder filtered in the first stage, it will be guided to the inside of the collection hopper 304 and contact the buffer plate 305 for buffering.

[0070] When the sand making equipment only requires stone powder of a certain size (e.g., <30mm), the pneumatic bar valve 401 will be activated, adjusting the bar gap in the pneumatic bar valve 401 to between 32mm and 35mm. This will then drive the bars in the pneumatic bar valve 401 and the fixed screen plate 403 to move towards the inside of the collection hopper 304. Simultaneously, the second telescopic plate 404 will also be driven to extend and retract towards the inside of the collection hopper 304. After the second telescopic plate 404 has moved a certain distance... The vertical groove 406 of the second telescopic plate 404 will drive the large movable column in the guide plate 402 to move towards the inside of the collection hopper 304. When the large movable column in the guide plate 402 moves, the small movable column in the guide plate 402 will slide in the limiting groove 405, so that the guide plate 402 in the inverted V shape becomes the guide plate 402 in the parallel state. At the same time, when the guide plate 402 becomes the parallel state, the screen plate 403 is parallel to the height of the guide plate 402.

[0071] Meanwhile, when the reciprocating linear vibrating screen 301 moves towards the interior of the collection hopper 304, it drives the first telescopic plate 306 downward, simultaneously causing the parallel guide plate 402 to change into a V-shape. When the reciprocating linear vibrating screen 301 moves away from the interior of the collection hopper 304, it drives the first telescopic plate 306 upward, causing the V-shaped guide plate 402 to change into a parallel guide plate 402. During this continuous switching process... This allows the stone powder received by the guide plate 402 to be lifted and contact the inner side of the tail frame 1 of the return conveyor for crushing. At the same time, after filtering the stone powder <30mm, it will be guided to the sand making machine 2 for sand making. When the stone powder >30mm that has not passed through the pneumatic bar valve 401 is activated to reset, the parallel guide plate 402 will change into an inverted V-shaped guide plate 402, guiding the unfiltered stone powder to the pre-prepared collection box.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sand making device with controllable stone powder content, characterized in that: Includes a return conveyor tail frame (1), a sand making machine (2) is provided on the side of the return conveyor tail frame (1), a primary filtration structure (300) is provided inside the return conveyor tail frame (1), and a secondary filtration structure (400) is provided on the side of the return conveyor tail frame (1) away from the primary filtration structure (300). When the stone powder only needs to be filtered once, the primary filtration structure (300) is driven by the cylinder (5) to reciprocate to filter the stone powder for the first time, and at the same time, the secondary filtration structure (400) is driven to shake and discharge the stone powder filtered for the first time. When stone powder needs secondary filtration, the secondary filtration structure (400) is in a parallel state, and then the primary filtration structure (300) is driven by the cylinder (5) to reciprocate to filter the stone powder for the first time, and the secondary filtration structure (400) is driven to lift the stone powder to contact the tail frame (1) of the return conveyor belt for crushing, and the crushed stone powder is filtered through the secondary filtration structure (400). The primary filtration structure (300) includes a linear vibrating screen (301), which is slidably connected inside the tailstock (1) of the return conveyor belt. Two sets of moving blocks (302) are fixedly connected to both sides of the linear vibrating screen (301). The two sets of moving blocks (302) are slidably connected inside the tailstock (1) of the return conveyor belt. Two sets of telescopic columns (303) are fixedly connected inside the two sets of moving blocks (302). The two sets of telescopic columns (303) are far away from the two sets of moving blocks (302). Two sets of cylinders (5) are fixedly connected to one end of the return conveyor belt (1). A first telescopic plate (306) is fixedly connected to the inner side of the return conveyor belt (1). Two sets of straight sliding grooves (307) are symmetrically opened on the inner side of the return conveyor belt (1) near the first telescopic plate (306). A collection hopper (304) is fixedly connected to the bottom of the return conveyor belt (1). A buffer plate (305) is provided inside the collection hopper (304). The surface of the buffer plate (305) is fixedly connected to the cylinder (5). The secondary filtration structure (400) includes a pneumatic bar valve (401), which is divided into a pneumatic valve and a bar. The pneumatic valve of the pneumatic bar valve (401) is fixedly connected to the surface of the tail frame (1) of the return conveyor belt. The bar of the pneumatic bar valve (401) passes through the bottom of the tail frame (1) of the return conveyor belt and is fixedly connected to a screen plate (403). A second telescopic plate (404) is fixedly connected to the side of the screen plate (403). Two guide plates (402) are slidably connected to the side of the second telescopic plate (404) away from the screen plate (403). Two sets of limiting grooves (405) are symmetrically opened on the side of the second telescopic plate (404) away from the screen plate (403). A vertical sliding groove (406) is opened in the middle of the side of the second telescopic plate (404) away from the screen plate (403). When the pneumatic bar valve (401) is not in motion, the screen plate (403) and the second telescopic plate (404) fixed at the bottom of the bar of the pneumatic bar valve (401) are located on the inner side close to the tail frame (1) of the return conveyor. At this time, the guide plate (402) is in an inverted V shape and has a gap with the inner side of the collection hopper (304). When the pneumatic bar valve (401) is in motion, the screen plate (403) and the second telescopic plate (404) fixed at the bottom of the bar of the pneumatic bar valve (401) are located on the inner side close to the collection hopper (304). At this time, the guide plate (402) is in a parallel state and is tightly attached to the inner side of the collection hopper (304). When the guide plate (402) is in an inverted V shape, the two sides of the guide plate (402) are far away from the inner side of the tail frame (1) of the return conveyor belt. At this time, the linear vibrating screen (301) and the first telescopic plate (306) move to discharge the stone powder received by the guide plate (402). When the guide plate (402) is in a parallel state, the two sides of the guide plate (402) are close to the inner side of the tail frame (1) of the return conveyor belt. At this time, the linear vibrating screen (301) and the first telescopic plate (306) move to impact and crush the stone powder received by the guide plate (402).

2. The sand making equipment with controllable stone powder content according to claim 1, characterized in that: The second telescopic plate (404) is divided into a telescopic frame and a rectangular plate. The telescopic frame of the second telescopic plate (404) is fixedly connected to the inner side of the tail frame (1) of the return conveyor belt. The rectangular plate of the second telescopic plate (404) is fixedly connected to the side of the screen plate (403). The rectangular plate of the second telescopic plate (404) is slidably connected to the telescopic frame.

3. The sand making equipment with controllable stone powder content according to claim 1, characterized in that: Large and small movable columns are provided between the two guide plates (402) and on both sides. The small movable columns provided on both sides of the two guide plates (402) are adapted to the straight slide groove (307). The end of the small movable column provided on both sides of the two guide plates (402) away from the straight slide groove (307) is adapted to the vertical slide groove (406).

4. The sand making equipment with controllable stone powder content according to claim 2, characterized in that: The buffer plate (305) inside the hopper (304) has several sets of holes. The buffer plate (305) is made of soft material. The hopper (304) is hollow inside. The inner side of the hopper (304) is fixedly connected to both sides of the second telescopic plate (404). The second telescopic plate (404) is adapted to the height of the screen plate (403).

5. A sand-making method for achieving controllable stone powder content, applied to a sand-making device with controllable stone powder content as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Ensure that the guide plate (402) is working properly, and at the same time ensure that the inside of the return conveyor tail frame (1) is clean and free of blockages; Step 2: Pour the stone powder onto the surface of the linear vibrating screen (301) and start the cylinder (5) to drive the linear vibrating screen (301) to reciprocate to filter the stone powder for the first time and receive it on the surface of the guide plate (402). Step 3: The guide plate (402) vibrates to quickly discharge the stone powder that has been filtered in the first stage from the collection hopper (304); Step 4: When secondary filtration is required, start the pneumatic bar valve (401) to adjust the required size and make it parallel to the guide plate (402); Step 5: Pass the stone powder initially filtered by the linear vibrating screen (301) through the pneumatic bar valve (401) to complete the secondary filtration. Step 6: The stone powder that has been filtered twice by the pneumatic bar valve (401) is discharged into the sand making machine (2) to make sand, and the stone powder content is controlled.

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