Sand making equipment and method with controllable stone powder content

Abstract

The invention relates to the technical field of sand making, in particular to stone powder content controllable sand making equipment which comprises a material returning belt machine tail frame, a sand making structure is arranged on the side face of the material returning belt machine tail frame, and a primary filtering structure is arranged in the material returning belt machine tail frame. A secondary filtering structure is arranged on the side, away from the primary filtering structure, of the material returning belt machine tail frame, stone powder is primarily filtered through up-down vibration of a moving block, when the stone powder needs to be filtered out of the specified size, a bar of a pneumatic bar valve moves and drives an inverted-V-shaped flow guide plate to be in a parallel state, and at the moment, a first telescopic plate continues to move; the guide plates in the parallel state can be changed into a V shape, so that stone powder on the guide plates makes contact with the interior of the material returning belt machine tail frame, on one hand, splashing stone powder collides with one another, the size and irregularity are reduced, on the other hand, the stone powder is guided to the direction of the pneumatic bar valve and filtered, and the production efficiency is improved advantageously; and meanwhile, the filtering effect of the pneumatic bar valve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sand making, and in particular to a sand making device and method with controllable stone powder content. Background Art

[0002] Coal preparation is also called coal washing, which is the process of selecting clean coal that meets the quality requirements of users from raw coal. In the field of minerals, stone powder sand making refers to the process of converting stone powder into machine-made 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 particle sizes through crushing, screening, powder selection and other processes. Before the existing stone powder is made into sand, it is necessary to screen out the stone powder suitable for sand making. The existing screening stone powder is initially filtered through a filter, and then the distance of the pneumatic rod valve is adjusted, and then the stone powder after the initial filtration is guided to the adjusted pneumatic rod valve for secondary filtration. The unqualified stone powder is returned to a storage box placed in advance, and the qualified stone powder enters the sand making equipment for sand making. However, when the existing sand making equipment needs smaller stone powder, the secondary filtration equipment needs to adjust the secondary filtration gap to a smaller state. If the stone powder after the initial filtration flows into the secondary filtration equipment with a smaller gap, the stone powder is easily accumulated near the secondary filtration equipment, and the stone powder required by the sand making equipment cannot be quickly screened out for the second time. Summary of the invention

[0003] The object of the present invention is to provide a sand making device and method with controllable stone powder content to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, one of the purposes of the present invention is to provide a sand making device with controllable stone powder content, comprising a return belt conveyor tail frame, a sand making structure is arranged on the side of the return belt conveyor tail frame, a primary filtering structure is arranged inside the return belt conveyor tail frame, and a secondary filtering structure is arranged on the side of the return belt conveyor tail frame away from the primary filtering structure; When the stone powder only needs to be filtered for the first time, the primary filtering structure is driven by the cylinder to reciprocate to filter the stone powder for the first time, and at the same time drives the secondary filtering structure to shake and discharge the stone powder filtered for the first time; 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, and drives the secondary filtration structure to lift the stone powder to contact and crush it with the tail frame of the return belt conveyor, and the crushed stone powder is filtered through the secondary filtration structure.

[0005] Preferably, the primary filtering structure includes a linear vibrating screen, which is slidably connected to the inside of the tail frame of the return belt conveyor, and two groups of moving blocks are fixedly connected on both sides of the linear vibrating screen, and the two groups of moving blocks are slidably connected to the inside of the tail frame of the return belt conveyor, and two groups of telescopic columns are fixedly connected inside the two groups of moving blocks, and two groups of cylinders are fixedly connected to the ends of the two groups of telescopic columns away from the two groups of moving blocks, and a first telescopic plate is fixedly connected to the inner side of the tail frame of the return belt conveyor, and two groups of linear slides are symmetrically provided on the inner side of the tail frame of the return belt conveyor near the first telescopic plate. A collecting hopper is fixedly connected to the bottom of the tail frame of the return belt conveyor, and a buffer plate is arranged inside the collecting hopper, and the surface of the buffer plate is fixedly connected to the cylinder.

[0006] The secondary filtration structure includes a pneumatic rod valve, which is divided into a pneumatic valve and a rod. The pneumatic valve of the pneumatic rod valve is fixedly connected to the surface of the tail frame of the return material belt conveyor. The rod of the pneumatic rod valve passes through the bottom of the tail frame of the return material belt conveyor and is fixedly connected to a screen slide plate. A second telescopic plate is fixedly connected to the side of the screen slide plate. Two guide plates are slidably connected to the side of the second telescopic plate away from the screen slide plate. Two groups of limit grooves are symmetrically opened on the side of the second telescopic plate away from the screen slide plate, and a vertical line slide groove is opened in the middle of the side of the second telescopic plate away from the screen slide plate.

[0007] 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 belt conveyor, the rectangular plate of the second telescopic plate is fixedly connected to the side of the screen slide plate, and the rectangular plate of the second telescopic plate is set to slide through the telescopic frame.

[0008] When the pneumatic rod valve is not moving, the screen slide plate and the second telescopic plate fixed at the bottom of the pneumatic rod valve rod are located on the inner side close to the tail frame of the return belt conveyor. At this time, the guide plate is in an inverted V shape and a gap is formed with the inner side of the collecting hopper. When the pneumatic rod valve is moving, the screen slide plate and the second telescopic plate fixed at the bottom of the pneumatic rod valve rod are located on the inner side close to the collecting hopper. At this time, the guide plate is in a parallel state and is tightly set against the inner side of the collecting hopper.

[0009] When the guide plate is in an inverted V shape, the two sides of the guide plate are far away from the inner side of the tail frame of the return belt conveyor. At this time, the linear vibrating screen and the first telescopic plate move to discharge the stone powder carried 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 belt conveyor. At this time, the linear vibrating screen and the first telescopic plate move to impact and crush the stone powder carried by the guide plate.

[0010] Large and small movable columns are respectively provided between and on both sides of the two guide plates. The small movable columns respectively provided on both sides of the two guide plates are adapted to the linear slide groove. The small movable columns respectively provided on both sides of the two guide plates are away from one end of the linear slide groove and are adapted to the vertical slide groove.

[0011] The buffer plate arranged inside the collecting hopper is provided with a plurality of groups of holes, the buffer plate is made of soft material, the interior of the collecting hopper is hollow, the inner side of the collecting hopper is fixedly connected to both sides of the second telescopic plate, and the second telescopic plate is height-matched with the screen slide plate.

[0012] The second object of the present invention is to provide a sand making method with controllable stone powder content, comprising the following steps: Step 1: Make sure the guide plate can work normally and the inside of the tail frame of the return belt conveyor is clean and unobstructed; 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 connect it to the surface of the guide plate; Step 3: The guide plate shakes to quickly discharge the stone powder that has undergone the initial filtration from the collecting hopper; Step 4: When secondary filtration is required, start the pneumatic rod valve to adjust the required size and make it parallel to the guide plate; Step 5: The stone powder initially filtered by the linear vibrating screen is filtered again through the pneumatic rod valve for secondary filtration; Step 6: The stone powder that has been filtered twice by the pneumatic rod valve is discharged into the sand making machine for sand making, and the stone powder content is controllable.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. In the sand making equipment with controllable stone powder content, the moving block and the telescopic column continuously slide on the surface of the tail frame of the return belt conveyor, and drive the linear vibrating screen to vibrate up and down, so that the stone powder blocked by the linear vibrating screen can be quickly dropped and filtered, and then the pneumatic rod valve is started and the required size gap is adjusted, so that the stone powder that has been filtered through the linear vibrating screen for the first time can be filtered again to obtain the required stone powder size, which is convenient for subsequent stone powder sand making and ensures the quality and size of the stone powder before sand making.

[0014] 2. In the sand making equipment with controllable stone powder content, when there is no need to filter the specified size, the stone powder is initially filtered by vibrating the moving block up and down, and the inverted V-shaped guide plate is driven to move synchronously, which can not only guide the stone powder after the initial filtration to the direction of the pneumatic rod valve in different areas, but also quickly guide the stone powder after the initial filtration out; When it is necessary to filter out the specified size, the rod of the pneumatic rod valve moves and drives the inverted V-shaped guide plate to become parallel. At this time, the first telescopic plate continues to move, and the parallel guide plate can be changed into a positive V shape, so that the stone powder on the guide plate contacts the inside of the tail frame of the return belt conveyor. On the one hand, the splashing stone powder is collided with each other to reduce the volume and irregularity, and on the other hand, the stone powder is accelerated to be guided to the direction of the pneumatic rod valve and filtered, which is beneficial to improve production efficiency and the filtering effect of the pneumatic rod valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure assembly of the present invention; Figure 2 It is a cutaway perspective view of the tail frame of the return belt conveyor of the present invention; Figure 3 It is a partial schematic diagram of the primary filtering structure of the present invention; Figure 4 It is a cross-sectional stereoscopic diagram of the primary filtering structure and the secondary filtering structure of the present invention; Figure 5 The schematic diagram of the primary filtering structure of the present invention without the linear vibrating screen; Figure 6 for Figure 5 The enlarged schematic diagram at A in the middle; Figure 7 It is a schematic diagram of the connection relationship between the guide plate and the first telescopic plate of the present invention; Figure 8 It is a schematic diagram of the disassembly of the linear slide and guide plate structure of the present invention; Fig. 9 It is a schematic diagram of the disassembly of the second telescopic plate and the guide plate structure of the present invention; Fig.10 It is a schematic diagram of the non-moving structure of the overall structure of the present invention; Fig.11 It is a schematic diagram of the structure of the overall structure of the present invention after the motion state.

[0016] The meaning of each number in the figure is: 1. Tail frame of return belt conveyor; 2. Sand making machine; 300. Primary filtering structure; 301. Linear vibrating screen; 302. Moving block; 303. Telescopic column; 304. Collecting hopper; 305. Buffer plate; 306. First telescopic plate; 307. Linear slide; 400. Secondary filtering structure; 401. Pneumatic rod valve; 402. Guide plate; 403. Screen slide; 404. Second telescopic plate; 405. Limiting groove; 406. Vertical slide; 5. Cylinder. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Before the sand making equipment is used, it is necessary to screen out the stone powder suitable for sand making. In particular, when the stone powder is specified to be filtered out, the equipment for screening the stone powder needs to be adjusted to a specified gap state. If the stone powder continues to flow into the filtering equipment, the stone powder is easy to accumulate on the surface of the filtering equipment, and the stone powder required by the sand making equipment cannot be effectively and quickly screened out. For this reason, the present invention provides a sand making equipment with controllable stone powder content. For the first embodiment of the present invention, please refer to Figure 1-Figure 11 , including a return belt conveyor tail frame 1, a sand making machine 2 is arranged on the side of the return belt conveyor tail frame 1, a primary filtering structure 300 is arranged inside the return belt conveyor tail frame 1, and a secondary filtering structure 400 is arranged on the side of the return belt conveyor tail frame 1 away from the primary filtering structure 300.

[0019] When the stone powder only needs to be filtered for the first time, the secondary filtering structure 400 is in a non-moving state, and then the primary filtering structure 300 is driven by the cylinder 5 to reciprocate to filter the stone powder for the first time, and at the same time drives the secondary filtering structure 400 to shake and discharge the stone powder filtered for the first time; When the stone powder needs primary and secondary filtration, the secondary filtration structure 400 moves to 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 primary filtering, and at the same time drives the secondary filtration structure 400 to lift the stone powder and contact it with the tail frame 1 of the return belt conveyor for crushing, and the crushed stone powder is filtered through the secondary filtration structure 400.

[0020] The present invention Figure 2-Figure 6At present, the screening device before stone powder sand making is divided into two cases for filtering. One case is to filter out 50mm stone powder, and the other case is to filter out the stone powder specified below 50mm. This is because the particle size of the stone powder feed required by the existing sand making machine is required to be between 30mm and 50mm. If the feed particle size is too large, such as exceeding 50mm, the stone powder cannot be fully accelerated and effectively ejected in the sand making machine, resulting in poor crushing effect and failure to meet the expected finished product particle size requirements. Therefore, the moving block 302 and the telescopic column 303 are continuously moved on the tail frame 1 of the return belt conveyor. The surface slides and drives the linear vibrating screen 301 to vibrate reciprocatingly up and down, so that the stone powder blocked by the linear vibrating screen 301 can be quickly dropped and filtered. When there is no need to filter out the specified stone powder for the second time, the initial state of the guide plate 402 is an inverted V shape, and there will be gaps between the two sides of the inverted V-shaped guide plate 402 and the inner side of the tail frame 1 of the return belt conveyor. 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 collecting hopper 304 and protected by the buffer plate 305 until it is transferred to the external storage box prepared in advance, completing the filtration of stone powder below 50mm.

[0021] Next, considering that when the sand making machine needs to specify stone powder, such as the need to filter out the specified stone powder below 50mm, the inverted V-shaped guide plate 402 will guide the stone powder into the collecting hopper 304, and it cannot undergo secondary filtration. Therefore, the screen slide plate 403 fixed by the bars of the pneumatic rod valve 401 moves and drives the inverted V-shaped guide plate 402 to become parallel, and 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 the stone powder. At this time, when the first telescopic plate 306 is driven by the linear vibrating screen 301 to continue to move, the parallel guide plate 402 can be changed into a positive V shape, so that the stone powder on the guide plate 402 contacts the inside of the return belt conveyor tail frame 1. On the one hand, the splashed stone powder is collided with each other to reduce the volume and irregularity, and on the other hand, the stone powder is accelerated to be guided to the direction of the pneumatic rod valve 401 and filtered, which is beneficial to improving production efficiency and improving the filtering effect of the pneumatic rod valve 401.

[0022] What is explained here is the working principle of the sand making machine 2, which is well known to those skilled in the art. For example, the working principle of an impact sand making machine is to utilize a high-speed rotating impeller or rotor to accelerate and eject the material, so that the material collides and rubs against each other to be crushed and shaped. The feed particle size of the impact sand making machine is generally required to be between 30mm and 50mm. Therefore, the material below 50mm is collected from a storage box prepared in advance under the collecting hopper 304 and then poured into the sand making machine 2. When it is necessary to filter out the specified stone powder, it will be filtered through the secondary filter structure 400 and diverted to the sand making machine 2, which can ensure the crushing effect and production efficiency of the sand making machine, so that the sand making machine can stably produce machine-made sand that meets the particle size requirements.

[0023] On the basis of the above, it is necessary to disclose in detail the specific structure and movement process of the first case filtering: First, we need to filter out the stone powder below 50mm (the first case), please refer to Figure 1-Figure 6 The primary filtering structure 300 includes a linear vibrating screen 301, which is slidably connected to the inside of the return belt conveyor tail frame 1. Two groups of moving blocks 302 are fixedly connected on both sides of the linear vibrating screen 301, and the two groups of moving blocks 302 are slidably connected to the inside of the return belt conveyor tail frame 1. Two groups of telescopic columns 303 are fixedly connected inside the two groups of moving blocks 302. Two groups of cylinders 5 are fixedly connected to one end of the two groups of telescopic columns 303 away from the two groups of moving blocks 302. A first telescopic plate 306 is fixedly connected to the inner side of the return belt conveyor tail frame 1. Two groups of linear slide grooves 307 are symmetrically provided on the inner side of the return belt conveyor tail frame 1 near the first telescopic plate 306. A collecting hopper 304 is fixedly connected to the bottom of the return belt conveyor tail frame 1. A buffer plate 305 is arranged inside the collecting hopper 304, and the surface of the buffer plate 305 is fixedly connected to the cylinder 5.

[0024] The staff pours the stone powder onto the surface of the linear vibrating screen 301, and then starts the cylinder 5, so that the telescopic column 303 fixedly connected to the output end of the cylinder 5 reciprocates up and down, and synchronously drives the moving block 302 to move. At this time, the movement of the moving block 302 drives the linear vibrating screen 301 to reciprocate up and down inside the tail frame 1 of the return material belt conveyor, so that the surface of the linear vibrating screen 301 receives stone powder of different sizes and quickly vibrates and falls into the tail frame 1 of the return material belt conveyor, thereby achieving the initial filtration of the stone powder, that is, filtering out stone powder of less than 50mm.

[0025] It is explained here that the linear vibrating screen 301 is set as a single-layer screen, and the mesh size is set to 50mm*50mm. This is because the feed particle size requirement of the sand making equipment mentioned above is between 30mm-50mm, so the mesh size is set to 50mm*50mm in order to make the stone powder filtered for the first time meet the sand making requirements as much as possible.

[0026] In order to filter out the stone powder below 50 mm in the first case, discharge it into the storage box prepared in advance in the collecting hopper 304, and pour it into the sand making machine 2, it is necessary to disclose the following specific structure in detail, please refer to Figure 4-Figure 9The secondary filtering structure 400 includes a pneumatic rod valve 401, which is divided into a pneumatic valve and a rod. The pneumatic valve of the pneumatic rod valve 401 is fixedly connected to the surface of the tail frame 1 of the return material belt conveyor. The rod of the pneumatic rod valve 401 penetrates the bottom of the tail frame 1 of the return material belt conveyor and is fixedly connected to a screen slide plate 403. A second telescopic plate 404 is fixedly connected to the side of the screen slide plate 403. A guide plate 402 is slidably connected to the side of the second telescopic plate 404 away from the screen slide plate 403. Two groups of limiting grooves 405 are symmetrically opened on the side of the second telescopic plate 404 away from the screen slide plate 403, and a vertical line slide groove 406 is opened in the middle of the side of the second telescopic plate 404 away from the screen slide plate 403.

[0027] What is explained here is the positional relationship between the guide plate 402 and the collecting hopper 304 in different states, which is convenient for understanding the guide plate 402 in different states mentioned below. When the pneumatic rod valve 401 is not moving, the screen slide plate 403 fixed at the bottom of the pneumatic rod valve 401 and the second telescopic plate 404 are located on the inner side of the tail frame 1 of the return belt conveyor. At this time, the guide plate 402 is in an inverted V shape, and a gap is generated with the inner side of the collecting hopper 304, and the linear vibrating screen 301 and the first telescopic plate 306 move to discharge the stone powder received by the guide plate 402.

[0028] Here, please combine the structures and states mentioned in the above two paragraphs. Since the linear vibrating screen 301 has initially filtered out the stone powder <50mm, the inverted V-shaped guide plate 402 mentioned above will receive the stone powder initially filtered. 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 belt conveyor tail frame 1 (that is, there is a gap). Therefore, when the guide plate 402 receives the stone powder initially filtered, it will fall from the gap between the guide plate 402 and the collecting hopper 304, and be diverted to the inside of the collecting hopper 304, and contact with the buffer plate 305 for buffering, and then it will fall from the opening of the collecting hopper 304 into the pre-prepared storage box, and then poured into the sand making machine 2, so as to achieve the screening of stone powder <50mm for the sand making equipment.

[0029] Here, the detailed movement process of shaking the guide plate 402 to improve the diversion effect before the guide plate 402 diverts the stone powder to the inside of the collecting hopper 304 is described. When the inverted V-shaped guide plate 402 normally diverts the primary filtered stone powder, the linear vibrating screen 301 normally reciprocates to filter the stone powder for the primary filter, and will synchronously drive the first telescopic plate 306 to move. The first telescopic plate 306 will drive the inverted V-shaped guide plate 402 to shake, and the stone powder received by the guide plate 402 for the primary filter will be quickly discharged from the gap between the guide plate 402 and the collecting hopper 304. At this time, the second telescopic plate 404 that is not moving is in the inner cavity blocked by the tail frame 1 of the return belt conveyor, forming a closed inner cavity. This arrangement prevents the primary filtered stone powder from passing through the secondary filtering structure 400.

[0030] In order to filter the stone powder to a specified size (i.e. the second case), the following specific structure needs to be disclosed in detail, please refer to Figure 2-Figure 6 When the pneumatic rod valve 401 moves, the screen slide plate 403 and the second telescopic plate 404 fixed at the bottom of the pneumatic rod valve 401 are located near the inner side of the collecting hopper 304. At this time, the guide plate 402 is in a parallel state and is tightly arranged on the inner side of the collecting hopper 304. When the guide plate 402 is in a parallel state, both sides of the guide plate 402 are close to the inner side of the tail frame 1 of the return belt conveyor. 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.

[0031] The connection and position relationship of the guide plates 402 will be described in detail here to facilitate understanding of the movement process of the guide plates 402 deforming into a parallel state below. Large and small movable columns are respectively provided between and on both sides of the two guide plates 402. The small movable columns respectively provided on both sides of the two guide plates 402 are adapted to each other with the linear slide groove 307. The small movable columns respectively provided on both sides of the two guide plates 402 are away from one end of the linear slide groove 307 and are adapted to each other with the linear slide groove 307. The large movable column between the two guide plates 402 is set to abut against the inner side of the tail frame 1 of the return material belt conveyor. The large movable column between the two guide plates 402 is adapted to the vertical slide groove 406, and 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 material belt conveyor, the rectangular plate of the second telescopic plate 404 is fixedly connected to the side of the screen slide plate 403, and the rectangular plate of the second telescopic plate 404 is set to slide through the telescopic frame.

[0032] Please refer to the following structure and status of the above two paragraphs. Figure 8-Figure 11 Describe the movement process of filtering out the stone powder of the specified size in the second case (the filtering of stone powder below 30mm is taken as an example below). When the stone powder filtered by the initial filtering structure 300 cannot meet the requirements of the sand making machine 2, the staff will start the pneumatic rod valve 401 to adjust the rod gap in the pneumatic rod valve 401 to between 32mm and 35mm (the working principle of the pneumatic rod valve 401 is explained here, which is well known in the technical field. When the material flow is cut off or the flow is adjusted according to the working conditions, the rods need to be inserted one by one through the pneumatic valve. When the rods are inserted into the frame, many rods form parallel grid plates, which block the block material on one side of the gate, thereby preventing the material from flowing. In addition, the gap size between the rods can be adjusted according to specific needs to control the flow of the material and the size of the material passing through to meet different production process requirements).

[0033] The rod is adjusted to between 32mm and 35mm. This setting is larger than the required stone powder and can allow the required stone powder to flow smoothly. Then the rod in the pneumatic rod valve 401 and the fixed screen slide plate 403 will be driven to move toward the inside of the collecting hopper 304. At the same time, the rectangular plate of the second telescopic plate 404 will be synchronously driven to slide in the telescopic frame and move toward the inside of the collecting hopper 304. When the rectangular plate of the second telescopic plate 404 moves a certain distance, the vertical slide groove 406 opened on the side of the second telescopic plate 404 close to the guide plate 402 will press against the large movable column in the guide plate 402 and move toward the inside of the collecting 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 on the telescopic frame of the second telescopic plate 404, so that the guide plate 402 in the inverted V-shaped state becomes the guide plate 402 in the parallel state.

[0034] 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 both sides of the guide plate 402 fit with the inner cavity of the collecting hopper 304, so that the stone powder filtered by the primary filtering structure 300 is guided to the pneumatic rod valve 401 for secondary filtration.

[0035] Here, the crushing of the stone powder when the guide plate 402 guides the primary filtration is described. This is because when the guide plate 402 guides, the larger stone powder (i.e., stone powder > 30 mm) will not be able to pass through the pneumatic rod valve 401. Therefore, the larger stone powder needs to be crushed to facilitate the filtration through the pneumatic rod valve 401. The following is the working process of crushing the stone powder. When the guide plate 402 is in a parallel state, the reciprocating linear vibrating screen 301 moves toward the inside of the collecting hopper 304, which drives the first telescopic plate 306 to move downward, and at the same time drives the parallel guide plate 402 to become a positive V shape. When the reciprocating linear vibrating screen 301 moves away from the inside of the collecting hopper 304, it will drive the first telescopic plate 306 to move upward, so that the guide plate 402 in the V-shaped state will become the guide plate 402 in the parallel state. During the continuous switching between the two, the stone powder carried by the guide plate 402 can be lifted and contacted with the inner side of the tail frame 1 of the return belt conveyor, which can not only quickly guide the stone powder filtered for the first time to the pneumatic rod valve 401, but also can impact and crush the stone powder filtered for the first time, so that the stone powder larger than 30mm is crushed into the gap set by the rods of the pneumatic rod valve 401, thereby improving the stone powder filtering effect.

[0036] At the same time, after the stone powder with a size less than 30 mm is filtered, it will be diverted to the sand making machine 2 for sand making. When the stone powder that has not passed through the pneumatic rod valve 401 (i.e., the stone powder with a size greater than 30 mm) is filtered, and the pneumatic rod valve 401 is started to reset after the stone powder filtering is completed, so that the guide plate 402 in the parallel state becomes the guide plate 402 in the inverted V-shaped state, and the unfiltered stone powder is diverted to the collection box prepared in advance in the collecting hopper 304.

[0037] The second aspect of the present invention is to realize sand making with controllable stone powder content, comprising the following steps: Step 1: Ensure that the guide plate 402 can work normally, and ensure that the interior of the tail frame 1 of the return belt conveyor is clean and unobstructed; 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 connect it with the surface of the guide plate 402; Step 3: The guide plate 402 shakes to quickly discharge the stone powder that has undergone the initial filtration from the collecting hopper 304; Step 4: When secondary filtration is required, start the pneumatic rod valve 401 to adjust the required size and make it parallel to the guide plate 402; Step 5: The stone powder initially filtered by the linear vibrating screen 301 is filtered again by the pneumatic rod valve 401 for secondary filtration; Step six, the stone powder that has been filtered twice by the pneumatic rod valve 401 is discharged into the sand making machine 2 for sand making, and the stone powder content is controllable.

[0038] Working principle: The staff pours the stone powder onto the surface of the linear vibrating screen 301, and then starts the cylinder 5, so that the telescopic column 303 fixedly connected to the output end of the cylinder 5 reciprocates up and down, and synchronously 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 reciprocate up and down inside the tail frame 1 of the return material belt conveyor, so that the surface of the linear vibrating screen 301 receives stone powder of different sizes and quickly vibrates and falls into the inside of the tail frame 1 of the return material belt conveyor.

[0039] When the sand making equipment needs to filter stone powder less than 50mm, since the linear vibrating screen 301 has initially filtered out the stone powder less than 50mm, the inverted V-shaped guide plate 402 arranged inside the return belt conveyor tail frame 1 will receive the stone powder initially filtered. 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 belt conveyor tail frame 1 (that is, there is a gap). Therefore, when the guide plate 402 receives the stone powder initially filtered, it will be diverted to the inside of the collecting hopper 304 and contact with the buffer plate 305 for buffering.

[0040] When the sand making equipment only needs stone powder of a certain size (for example, less than 30mm), the pneumatic rod valve 401 will be started, and the gap of the rods in the pneumatic rod valve 401 will be adjusted to between 32mm and 35mm, and then the rods in the pneumatic rod valve 401 and the fixed screen slide plate 403 will be driven to move toward the inside of the collecting hopper 304. At the same time, the second telescopic plate 404 will be synchronously driven to move toward the inside of the collecting hopper 304. When the second telescopic plate 404 moves a certain distance, The vertical slide groove 406 provided on the second telescopic plate 404 will drive the large movable column in the guide plate 402 to move toward the inside of the collecting 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 limit groove 405, so that the guide plate 402 in the inverted V-shaped state becomes a guide plate 402 in a parallel state. At the same time, when the guide plate 402 becomes parallel, the screen slide plate 403 is parallel to the height of the guide plate 402.

[0041] At the same time, when the reciprocating linear vibrating screen 301 moves toward the inside of the collecting hopper 304, it drives the first telescopic plate 306 to move downward, and at the same time drives the guide plate 402 in a parallel state to change into a positive V shape. When the reciprocating linear vibrating screen 301 moves away from the inside of the collecting hopper 304, it drives the first telescopic plate 306 to move upward, and the guide plate 402 in a positive V shape changes into a parallel guide plate 402. , which can lift the stone powder carried by the guide plate 402 and make it contact with the inner side of the tail frame 1 of the return belt conveyor for crushing. At the same time, after the stone powder less than 30 mm is filtered, it will be diverted to the sand making machine 2 for sand making. When the stone powder that does not pass through the pneumatic rod valve 401, that is, the stone powder greater than 30 mm, the pneumatic rod valve 401 will be started to reset, so that the guide plate 402 in the parallel state will become the guide plate 402 in the inverted V-shaped state, and the unfiltered stone powder will be diverted to the collection box prepared in advance.

[0042] The above shows and describes 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 by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sand making equipment with controllable stone powder content, characterized in that: It comprises a tail frame (1) of a return belt conveyor, a sand making structure (2) being arranged on the side of the tail frame (1) of the return belt conveyor, a primary filtering structure (300) being arranged inside the tail frame (1) of the return belt conveyor, and a secondary filtering structure (400) being arranged on a side of the tail frame (1) of the return belt conveyor away from the primary filtering structure (300); When the stone powder only needs to be filtered initially, the primary filtering structure (300) is driven by the cylinder (5) to reciprocate to filter the stone powder initially, and at the same time drives the secondary filtering structure (400) to shake and discharge the initially filtered stone powder; When the stone powder needs secondary filtration, the secondary filtration structure (400) is in a state of moving to 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 drives the secondary filtration structure (400) to lift the stone powder to contact the tail frame (1) of the return belt conveyor for crushing, and the crushed stone powder is filtered through the secondary filtration structure (400).

2. The sand making equipment with controllable stone powder content according to claim 1 is characterized in that: The primary filtering structure (300) comprises a linear vibrating screen (301), the linear vibrating screen (301) being slidably connected to the inside of a tail frame (1) of a return material belt conveyor, two groups of moving blocks (302) being fixedly connected to both sides of the linear vibrating screen (301), the two groups of moving blocks (302) being slidably connected to the inside of the tail frame (1) of the return material belt conveyor, two groups of telescopic columns (303) being fixedly connected to the inside of the two groups of moving blocks (302), the two groups of telescopic columns (303) being away from the two groups of moving blocks ( One end of the return belt conveyor (302) is fixedly connected to two groups of cylinders (5), the inner side of the return belt conveyor tail frame (1) is fixedly connected to a first telescopic plate (306), and the inner side of the return belt conveyor tail frame (1) close to the first telescopic plate (306) is symmetrically provided with two groups of linear slide grooves (307). The bottom of the return belt conveyor tail frame (1) is fixedly connected to a collecting hopper (304), and a buffer plate (305) is arranged inside the collecting hopper (304), and the surface of the buffer plate (305) is fixedly connected to the cylinder (5).

3. The sand making equipment with controllable stone powder content according to claim 1 is characterized in that: The secondary filtering structure (400) comprises a pneumatic rod valve (401), wherein the pneumatic rod valve (401) is divided into a pneumatic valve and a rod, wherein the pneumatic valve of the pneumatic rod valve (401) is fixedly connected to the surface of the tail frame (1) of the return material conveyor, and the rod of the pneumatic rod valve (401) penetrates the bottom of the tail frame (1) of the return material conveyor and is fixedly connected to a screen slide plate (403), a second telescopic plate (404) is fixedly connected to the side of the screen slide plate (403), and two guide plates (402) are slidably connected to the side of the second telescopic plate (404) away from the screen slide plate (403), two groups of limiting grooves (405) are symmetrically provided on the side of the second telescopic plate (404) away from the screen slide plate (403), and a vertical line slide groove (406) is provided in the middle of the side of the second telescopic plate (404) away from the screen slide plate (403).

4. The sand making equipment with controllable stone powder content according to claim 3 is 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 belt conveyor. The rectangular plate of the second telescopic plate (404) is fixedly connected to the side of the screen slide plate (403). The rectangular plate of the second telescopic plate (404) is slidably arranged to penetrate the telescopic frame.

5. The sand making equipment with controllable stone powder content according to claim 3 is characterized in that: When the pneumatic bar valve (401) is not moving, the sieve slide 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 belt 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 collecting hopper (304). When the pneumatic bar valve (401) is moving, the sieve slide 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 collecting hopper (304). At this time, the guide plate (402) is in a parallel state and is tightly arranged with the inner side of the collecting hopper (304).

6. The sand making equipment with controllable stone powder content according to claim 3 is characterized in that: When the guide plate (402) is in an inverted V-shape, the two sides of the guide plate (402) and the inner side of the tail frame (1) of the return material conveyor are in a state of being away from each other. 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) and the inner side of the tail frame (1) of the return material conveyor are in a state of being close to each other. 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).

7. The sand making equipment with controllable stone powder content according to claim 5 is characterized in that: Large and small movable columns are respectively provided between and on both sides of the two guide plates (402); the small movable columns respectively provided on both sides of the two guide plates (402) are adapted to the linear slide groove (307); and the ends of the small movable columns respectively provided on both sides of the two guide plates (402) away from the linear slide groove (307) are adapted to the vertical slide groove (406).

8. The sand making equipment with controllable stone powder content according to claim 2 is characterized in that: A buffer plate (305) disposed inside the collecting hopper (304) is provided with a plurality of groups of holes. The buffer plate (305) is made of a soft material. The inside of the collecting hopper (304) is hollow. The inside of the collecting hopper (304) is fixedly connected to both sides of the second telescopic plate (404). The second telescopic plate (404) is highly matched to the screen slide plate (403).

9. A method for achieving sand making with controllable stone powder content, applied to a sand making device with controllable stone powder content as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Ensure that the guide plate (402) can work normally and that the interior of the tail frame (1) of the return belt conveyor is clean and free of obstruction; 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 connect it to the surface of the guide plate (402); Step 3: The guide plate (402) shakes to quickly discharge the stone powder that has undergone the initial filtration from the collecting hopper (304); Step 4: When secondary filtration is required, the pneumatic rod valve (401) is started to adjust the required size and parallel to the guide plate (402); Step 5, the stone powder initially filtered by the linear vibrating screen (301) is passed through the pneumatic rod valve (401) to complete secondary filtration; Step 6: The stone powder that has been filtered twice by the pneumatic rod valve (401) is discharged into the sand making machine (2) for sand making, and the stone powder content is controllable.

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