A sizing and screening plant for mine stone

Abstract

The utility model relates to mine stone processing technical field, and disclose a kind of mine stone grading and screening equipment, including pipeline box, the inside grading and screening mechanism of pipeline box is slidably connected with the grading and screening mechanism of pipeline box, the transmission mechanism of grading and screening mechanism is drivingly connected and is fixedly connected on the outside of pipeline box, the left and right sides of pipeline box are fixedly connected with the flow guide shell that is communicated with grading and screening mechanism, the positive and negative sides of pipeline box are provided with the linkage mechanism that is drivingly connected with grading and screening mechanism;The grading and screening mechanism includes three screen boxes, and three screen boxes are vertically equidistantly distributed and are mutually inclined arrangement.The mine stone grading and screening equipment, with three-stage collaborative screening, high screening efficiency, not easy to block screen hole, transmission stable and reliable, compact structure, maintenance convenient and other advantages, solve the problem that existing equipment is difficult to efficiently complete the one-time grading of multi-particle-size stone, poor running stability, high maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of mining stone processing technology, specifically to a grading and screening device for mining stone. Background Technology

[0002] In the process of mining and stone processing, the mined stone needs to be graded and screened to meet the particle size requirements of subsequent crushing, conveying, and processing.

[0003] Currently, most mining stone grading and screening equipment on the market adopts a single-stage screening structure, or although it is a multi-stage screening, each stage screening mechanism is driven independently, which has the following problems:

[0004] First, single-stage screening can only separate stone of one particle size. If multiple particle sizes need to be graded, multiple screening operations are required, which is inefficient and cannot meet the continuous needs of large-scale stone processing in mines.

[0005] Secondly, multi-stage independently driven screening equipment has a complex structure, requires multiple drive components, has high energy consumption, and poor motion coordination of each screening mechanism, which can easily lead to stone accumulation on the screen surface and blockage of the screen holes, resulting in poor screening effect and even requiring shutdown for cleaning, affecting production progress.

[0006] Third, the transmission mechanism of some screening equipment is not stable enough. The linkage or cam transmission structure used lacks effective support and limit. After long-term use, the parts are prone to wear and the gaps are increased, which leads to unstable movement of the screen box, further reducing the screening accuracy. At the same time, it increases the equipment maintenance cost and downtime. Therefore, a grading and screening equipment for mining stone is proposed to solve the above problems. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] To address the problems of low screening efficiency, poor multi-stage screening coordination, easy stone accumulation and blockage, insufficient stability of transmission mechanism, and high maintenance cost in existing mining stone grading and screening equipment, this utility model provides a mining stone grading and screening device with advantages such as three-stage coordinated screening, high screening efficiency, less prone to screen hole blockage, stable and reliable transmission, compact structure, and convenient maintenance. It solves the problems of existing equipment being unable to efficiently complete the one-time grading of multi-size stone, poor operational stability, and high maintenance cost.

[0009] (II) Technical Solution

[0010] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A grading and screening equipment for mining stone includes a pipe box, a grading and screening mechanism slidably connected to the inside of the pipe box, a transmission mechanism that is driven by the grading and screening mechanism and fixedly connected to the outside of the pipe box, a flow guide shell that communicates with the grading and screening mechanism and fixedly connected to both the left and right sides of the pipe box, and a linkage mechanism that is driven by the grading and screening mechanism and fixedly connected to both the front and back sides of the pipe box.

[0011] The grading and screening mechanism includes three sieve boxes arranged at inclinations to each other, with the three sieve boxes distributed vertically at equal distances.

[0012] The transmission mechanism includes a mounting plate, which is fixedly connected to the side of the pipe box. A camel wheel is rotatably connected to the front of the mounting plate, and a motor with its output end fixedly connected to the camel wheel is fixedly connected to the back of the mounting plate. A push shaft is fixedly connected to the front of the camel wheel, and a connecting rod is rotatably connected to the outside of the push shaft. One end of the connecting rod is rotatably connected to a push rod that passes through the pipe box and is fixedly connected to the outside of the intermediate screen box.

[0013] The linkage mechanism includes a mounting block and two linkage blocks. The mounting block is located between the two linkage blocks. The mounting block and the two linkage blocks are fixedly connected to the outside of the three sieve boxes respectively. Rotating seats are fixedly connected to the upper and lower sides of the mounting block. A linkage rod passing through the upper and lower linkage blocks is rotatably connected inside the two rotating seats. A swing groove adapted to the linkage rod is opened inside the two linkage blocks. A linkage groove is opened inside the two linkage rods. A limiting rod passing through the linkage groove is fixedly connected inside the two swing grooves.

[0014] The beneficial effects of this utility model are:

[0015] This grading and screening equipment for mining stone boasts advantages such as three-stage coordinated screening, high screening efficiency, resistance to screen hole clogging, stable and reliable transmission, compact structure, and convenient maintenance. Through three screen boxes with progressively smaller inner diameters in the grading and screening mechanism, it achieves three-stage grading of stone from top to bottom, separating three different particle sizes in a single operation, significantly improving screening efficiency. The transmission mechanism utilizes a camel wheel-connecting rod-push rod transmission structure to provide stable linear reciprocating motion power to the intermediate screen box, further enhanced by the support and limiting of reinforcing ribs and a stabilizing frame. The linkage mechanism, through the coordination of the linkage rod, rotating seat, limiting rod, and rotating shaft, achieves counter-coordinated movement between the upper and lower screen boxes and the intermediate screen box, increasing the frequency of stone tumbling on the screen surface and preventing accumulation and clogging. Simultaneously, the inclusion of guide plates, discharge hoppers, and guide shells ensures smooth stone conveying and discharge. The overall compact design reduces equipment space occupation and maintenance costs, making it suitable for continuous grading and screening operations of large-scale mining stone.

[0016] Based on the above technical solution, the present invention can be further improved as follows.

[0017] Furthermore, the pipe box can be connected to the stone conveying pipe, and the inside of the pipe box is fixedly connected with six guide plates arranged in a funnel shape. The six guide plates are arranged in pairs above the three screen boxes.

[0018] The beneficial effects of adopting the above-mentioned further solution are that the six funnel-shaped guide plates are distributed in groups of two to correspond to the three screen boxes, which can accurately divert the stone material entering from the top of the pipeline box to the screen boxes of each level, avoiding the stone material from spreading in the box and causing local accumulation; the funnel structure can slow down the falling speed of the stone material, prevent the stone material from directly impacting the screen box surface, reduce screen surface wear, and extend the service life of the screen box; at the same time, the guide plates can block the splashing of stone material during the screening process, prevent the stone material from spilling out of the pipeline box, ensure a clean working environment, and reduce material waste.

[0019] Furthermore, the grading and screening mechanism also includes six sliders, which are fixedly connected to the front and back sides of the three screen boxes respectively. The front and back sides of the pipe box are provided with three sliding grooves that are adapted to the sliders. The inner diameter of the screen holes of the three screen boxes decreases from top to bottom. The left side of the upper and lower screen boxes and the right side of the middle screen box are open. The open side of each of the three screen boxes is fixedly connected to a discharge hopper that extends to the outside of the pipe box and is located inside the three guide shells respectively.

[0020] The beneficial effects of adopting the above-mentioned further solutions are as follows: the sliding cooperation between the slider and the chute can precisely limit the movement direction of the screen box, ensuring that the screen box only moves in a straight reciprocating motion in the horizontal direction, avoiding back-and-forth deviation or up-and-down swaying during movement, preventing the screen box from colliding with the inner wall of the pipe box and the guide plate, and improving the operational stability of the screening mechanism; the gradient design of the screen hole inner diameter "larger at the top and smaller at the bottom" can realize multi-level grading of stone materials, with the upper screen box separating large-sized stones, the middle separating medium-sized stones, and the lower separating small-sized stones, and the finest stones being discharged from the bottom of the pipe box, completing four-level particle size separation in one go, meeting the needs of multiple scenarios; the differentiated design of the screen box opening direction, opening to the left at the top and bottom and to the right in the middle, combined with the discharge hopper extending to the guide shell, can classify and guide stones of different particle sizes into the corresponding guide shells, avoiding mixing and ensuring grading accuracy. At the same time, the discharge hopper can prevent stones from spilling when discharged, reducing the amount of cleaning work.

[0021] Furthermore, the transmission mechanism is located between the two guide shells on the left side. The transmission mechanism is used to provide linear reciprocating motion for the intermediate screen box. The back of the mounting plate is fixedly connected to the side of the pipe box with two reinforcing ribs located on the upper and lower sides of the motor.

[0022] The beneficial effects of adopting the above-mentioned further solution are that the transmission mechanism is placed between the two guide shells on the left side, which can make full use of the idle space on the side of the pipe box, avoid interference with components such as guide shells and discharge hoppers, make the overall structure of the equipment more compact, reduce the installation space occupied, and facilitate integration with existing mine production lines; the two symmetrically distributed reinforcing ribs can enhance the connection strength between the mounting plate and the pipe box, offset the vibration and torque generated when the motor is working, prevent the mounting plate from bending and deforming under long-term stress, ensure the stability of the rotation center of the camel wheel, avoid the deviation of the transmission trajectory of the push shaft and connecting rod, ensure the smoothness of the push rod pushing the intermediate screen box, reduce the wear of transmission components, and extend the service life of the transmission mechanism.

[0023] Furthermore, the three guide shells are used to guide the screened ore to other conveying pipes. The top and bottom of the pipe box are open. A stabilizing frame that is slidably connected to the outside of the push rod is fixedly connected to the left side of the pipe box.

[0024] The beneficial effects of adopting the above-mentioned further scheme are that the guide shell can guide the stones screened at each stage to the subsequent dedicated conveying pipelines, realizing the classified conveying of the graded stones, providing convenience for subsequent different processes (such as re-crushing of large particles and direct processing of small particles), and improving the continuity of the production process; the top opening of the pipeline box can be directly connected to the main stone conveying pipeline to ensure continuous stone feeding; the bottom opening serves as the discharge port for the finest particles, eliminating the need for an additional discharge mechanism and simplifying the equipment structure; the sliding cooperation between the stabilizer and the push rod can guide and limit the reciprocating motion of the push rod, preventing left and right swaying during push rod movement, avoiding friction between the push rod and the through hole of the pipeline box, reducing push rod wear, and further ensuring the stability of the intermediate screen box movement.

[0025] Furthermore, the two linkage mechanisms are used to link the upper and lower screen boxes to move in the opposite direction to the middle screen box. The pipe box is also fixedly connected to two rotating shafts on both sides, which are slidably connected to two linkage rods respectively. When the linkage rods on both sides move, they can swing in the opposite direction around the rotating shafts, thereby driving the upper and lower screen boxes to move in the opposite direction.

[0026] The beneficial effects of adopting the above-mentioned further solution are that the two linkage mechanisms are symmetrically distributed on the front and back sides of the pipe box, which can make the upper and lower screen boxes evenly stressed and avoid the screen box movement deviation caused by unilateral drive; the linkage rod swings around the axis as the fulcrum, and with the limiting of the rotating seat and the limiting rod, the upper and lower linkage rods can swing in opposite directions, thereby driving the upper and lower screen boxes and the middle screen box to move in opposite linear motion; this reverse coordinated motion can enhance the turning frequency of the stone on the screen surface, break the stone accumulation state, effectively prevent the screen hole from being blocked, and at the same time increase the contact probability between the stone and the screen surface, thereby improving the screening efficiency; the limiting rod slides in the linkage groove, which can limit the swing amplitude of the linkage rod, avoid excessive swing causing component collision, and ensure the safe and reliable operation of the linkage mechanism. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0029] Figure 3 This is a schematic cross-sectional view of the present invention.

[0030] Figure 4 This is a schematic diagram of the side cross-sectional structure of this utility model.

[0031] In the diagram: 1. Pipe box; 2. Grading and screening mechanism; 201. Screen box; 202. Sliding block; 203. Slide chute; 204. Discharge hopper; 3. Transmission mechanism; 301. Mounting plate; 302. Camel wheel; 303. Motor; 304. Push shaft; 305. Connecting rod; 306. Push rod; 4. Guide shell; 5. Linkage mechanism; 501. Mounting block; 502. Linkage block; 503. Rotating seat; 504. Linkage rod; 505. Swing chute; 506. Linkage chute; 507. Limiting rod; 6. Guide plate; 7. Reinforcing rib; 8. Stabilizing frame; 9. Rotating shaft. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the embodiments, by Figure 1-4 The present invention provides a grading and screening device for mining stone materials. The device includes a pipe box 1, a grading and screening mechanism 2 slidably connected to the inside of the pipe box 1, a transmission mechanism 3 fixedly connected to the outside of the pipe box 1 and drivingly connected to the grading and screening mechanism 2, a flow guide shell 4 fixedly connected to the left and right sides of the pipe box 1 and communicating with the grading and screening mechanism 2, and a linkage mechanism 5 connected to the grading and screening mechanism 2 on both the front and back sides of the pipe box 1.

[0034] The grading and screening mechanism 2 includes three sieve boxes 201 arranged at inclinations to each other, with the three sieve boxes 201 distributed vertically at equal distances.

[0035] The transmission mechanism 3 includes a mounting plate 301, which is fixedly connected to the side of the pipe box 1. A camel wheel 302 is rotatably connected to the front of the mounting plate 301. A motor 303 with its output end fixedly connected to the camel wheel 302 is fixedly connected to the back of the mounting plate 301. A push shaft 304 is fixedly connected to the front of the camel wheel 302. A connecting rod 305 is rotatably connected to the outside of the push shaft 304. A push rod 306 that passes through the pipe box 1 and is fixedly connected to the outside of the intermediate screen box 201 is rotatably connected to one end of the connecting rod 305.

[0036] The linkage mechanism 5 includes a mounting block 501 and two linkage blocks 502. The mounting block 501 is located between the two linkage blocks 502. The mounting block 501 and the two linkage blocks 502 are fixedly connected to the outside of the three screen boxes 201 respectively. Rotating seats 503 are fixedly connected to the upper and lower sides of the mounting block 501. The interior of the two rotating seats 503 is rotatably connected to the linkage rods 504 that pass through the upper and lower linkage blocks 502 respectively. The interior of the two linkage blocks 502 is provided with swing grooves 505 that are adapted to the linkage rods 504. The interior of the two linkage rods 504 is provided with linkage grooves 506. The interior of the two swing grooves 505 is fixedly connected with limiting rods 507 that pass through the linkage grooves 506.

[0037] The pipe box 1 can be connected to the stone conveying pipe. Inside the pipe box 1, there are six funnel-shaped guide plates 6 fixedly connected. The six guide plates 6 are arranged in pairs and located above the three screen boxes 201 respectively.

[0038] Six funnel-shaped guide plates 6 are distributed in pairs to correspond to three screen boxes 201, which can accurately divert the stone material entering from the top of the pipe box 1 to each level of screen box 201, avoiding the stone material from spreading in the box and causing local accumulation. The funnel structure can slow down the falling speed of the stone material, prevent the stone material from directly impacting the screen surface of the screen box 201, reduce screen surface wear, and extend the service life of the screen box 201. At the same time, the guide plates 6 can block the splashing of stone material during the screening process, prevent the stone material from spilling out of the pipe box 1, ensure a clean working environment, and reduce material waste.

[0039] The grading and screening mechanism 2 also includes six sliders 202, which are fixedly connected to the front and back sides of the three screen boxes 201 respectively. The front and back sides of the pipe box 1 are provided with three sliding grooves 203 that are adapted to the sliders 202. The inner diameter of the screen holes of the three screen boxes 201 decreases from top to bottom. The left side of the upper and lower screen boxes 201 and the right side of the middle screen box 201 are open. The open side of the three screen boxes 201 is fixedly connected to a discharge hopper 204 that extends to the outside of the pipe box 1 and is located inside the three guide shells 4 respectively.

[0040] The sliding cooperation between slider 202 and chute 203 can precisely limit the movement direction of screen box 201, ensuring that screen box 201 only makes linear reciprocating motion in the horizontal direction, avoiding back-and-forth deviation or up-and-down swaying during movement, preventing screen box 201 from colliding with the inner wall of pipe box 1 and guide plate 6, and improving the operational stability of screening mechanism; the gradient design of screen hole inner diameter "larger at the top and smaller at the bottom" can realize multi-level grading of stone. The upper screen box 201 separates large-sized stone, the middle separates medium-sized stone, and the lower separates small-sized stone. The finest stone is discharged from the bottom of pipe box 1, completing four-level particle size separation in one go, meeting the needs of multiple scenarios; the differentiated opening direction design of screen box 201 opens to the left at the top and bottom and to the right in the middle. With the discharge hopper 204 extending to guide shell 4, different-sized stone can be classified and introduced into the corresponding guide shell 4 to avoid mixing and ensure grading accuracy. At the same time, discharge hopper 204 can prevent stone from spilling when discharged, reducing cleaning workload;

[0041] The transmission mechanism 3 is located between the two guide shells 4 on the left side. The transmission mechanism 3 is used to provide linear reciprocating motion for the intermediate screen box 201. The back of the mounting plate 301 is fixedly connected to the side of the pipe box 1 with two reinforcing ribs 7 located on the upper and lower sides of the motor 303.

[0042] The transmission mechanism 3 is located between the two guide shells 4 on the left side, which can make full use of the idle space on the side of the pipe box 1, avoid interference with the guide shells 4, discharge hopper 204 and other components, make the overall structure of the equipment more compact, reduce the installation space occupied, and facilitate the matching with the existing production line of the mine; the two symmetrically distributed reinforcing ribs 7 can enhance the connection strength between the mounting plate 301 and the pipe box 1, offset the vibration and torque generated when the motor 303 is working, prevent the mounting plate 301 from bending and deforming under long-term stress, ensure the stability of the rotation center of the camel wheel 302, avoid the deviation of the transmission trajectory of the push shaft 304 and the connecting rod 305, ensure the smoothness of the push rod 306 pushing the intermediate screen box 201, reduce the wear of transmission components, and extend the service life of the transmission mechanism 3;

[0043] Three guide shells 4 are used to guide the screened ore to other conveying pipes. The top and bottom of the pipe box 1 are open. The left side of the pipe box 1 is fixedly connected to a stabilizing frame 8 that is slidably connected to the outside of the push rod 306.

[0044] The guide shell 4 can guide the stones screened at each stage to the subsequent dedicated conveying pipelines, realizing the classified conveying of the graded stones, which provides convenience for subsequent different processes such as re-crushing of large particles and direct processing of small particles, and improves the continuity of the production process; the top opening of the pipe box 1 can be directly connected to the main stone conveying pipeline to ensure continuous stone feeding; the bottom opening serves as the discharge port for the finest particles, eliminating the need for an additional discharge mechanism and simplifying the equipment structure; the sliding cooperation between the stabilizer 8 and the push rod 306 can guide and limit the reciprocating motion of the push rod 306, preventing the push rod 306 from swaying left and right during movement, avoiding friction between the push rod 306 and the through hole of the pipe box 1, reducing the wear of the push rod 306, and further ensuring the stability of the movement of the intermediate screen box 201;

[0045] Two linkage mechanisms 5 are used to link the upper and lower screen boxes 201 and the middle screen box 201 to move in opposite directions. The front and back sides of the pipe box 1 are also fixedly connected with two rotating shafts 9, which are slidably connected to two linkage rods 504 respectively. When the two linkage rods 504 move, they can swing in opposite directions around the rotating shafts 9, thereby driving the upper and lower screen boxes 201 to move in opposite directions.

[0046] Two linkage mechanisms 5 are symmetrically distributed on the front and back sides of the pipe box 1, which can make the upper and lower screen boxes 201 evenly stressed and avoid the screen box 201 moving off course due to unilateral drive. The linkage rod 504 swings around the axis 9 as the fulcrum. With the limiting of the rotating seat 503 and the limiting rod 507, the upper and lower linkage rods 504 can swing in opposite directions, thereby driving the upper and lower screen boxes 201 and the middle screen box 201 to move in opposite linear directions. This reverse coordinated movement can enhance the turning frequency of the stone on the screen surface, break the stone accumulation state, effectively prevent the screen hole from being blocked, and at the same time increase the contact probability between the stone and the screen surface, thereby improving the screening efficiency. The limiting rod 507 slides in the linkage groove 506, which can limit the swing amplitude of the linkage rod 504, avoid excessive swing causing the parts to collide, and ensure the safe and reliable operation of the linkage mechanism 5.

[0047] Working principle:

[0048] Step 1: Complete the equipment installation and commissioning. Seal and connect the top opening of the pipe box 1 with the main stone conveying pipeline of the mine to ensure that the stone can enter the pipe box 1 continuously and stably. Connect the outlets of the three guide shells 4 to the subsequent conveying pipelines of the corresponding particle size stone, such as connecting the upper left guide shell 4 to the large particle size stone pipeline, the right guide shell 4 to the medium particle size pipeline, and the lower left guide shell 4 to the small particle size pipeline. Set up a receiving device below the bottom opening of the pipe box 1 or connect it to the finest particle size stone conveying pipeline to achieve complete docking of the equipment with the production line.

[0049] Step 2: Start the motor 303 of the transmission mechanism 3. After the motor 303 is powered on, it outputs torque, which drives the camel wheel 302 on the front of the mounting plate 301 to rotate at a constant speed. The push shaft 304 on the camel wheel 302 moves in a circular motion with the camel wheel 302. Since the push shaft 304 is rotatably connected to the connecting rod 305, the circular motion is converted into the reciprocating oscillation of the connecting rod 305. The connecting rod 305 drives the push rod 306 to move in a horizontal linear reciprocating motion. At this time, the stabilizer 8 on the left side of the pipe box 1 slides and engages with the push rod 306, which guides and limits the push rod 306 to prevent it from shaking. The push rod 306 is fixed to the intermediate screen box 201, which in turn pushes the intermediate screen box 201 to move in a linear reciprocating motion along the slide groove 203 of the pipe box 1. The sliders 202 on both sides of the screen box 201 slide along the slide groove 203 to ensure the stability of the motion trajectory.

[0050] Step 3: When the intermediate screen box 201 moves, the mounting block 501 on its outer side moves synchronously. The rotating seats 503 on the upper and lower sides of the mounting block 501 move with the mounting block 501, driving the rotating linkage rod 504 to move. The rotating shaft 9 on both sides of the pipe box 1 is slidably connected to the linkage rod 504, making the rotating shaft 9 the swing fulcrum of the linkage rod 504. The upper and lower linkage rods 504 swing in opposite directions around the rotating shaft 9. At the same time, the limiting rod 507 in the rotating seat 503 slides in the linkage groove 506 of the linkage rod 504, limiting the swing amplitude of the linkage rod 504 and avoiding excessive swing. The linkage rod 504 drives the upper and lower linkage blocks 502 to move, and finally makes the upper and lower screen boxes 201 move in a straight reciprocating motion along the slide groove 203 in the opposite direction to the intermediate screen box 201, realizing the coordinated reverse screening of the three screen boxes 201.

[0051] Step 4: Open the main valve of the stone conveying pipeline. The stone enters the top of the pipeline box 1, is divided by six guide plates 6, and falls evenly onto the screen surface of each level of screen box 201. Under the reciprocating motion of the screen box 201, the stone tumbles on the screen surface: large-sized stones larger than the screen holes of the upper screen box 201 slide along the inclined surface of the upper screen box 201, with the left side lower and the right side higher, to the left opening, enter the upper guide shell 4 on the left side through the discharge hopper 204, and then are introduced into the large-sized stone conveying pipeline; medium-sized stones smaller than the screen holes of the upper screen box 201 and larger than the screen holes of the middle screen box 201 fall into the middle screen box 201 and flow along the middle screen box 201. 01 The inclined surface, with a lower right side and a higher left side, slides to the right opening and enters the right guide shell 4 through the discharge hopper 204, then is introduced into the medium-sized particle pipe; small-sized stones smaller than the screen holes of the middle screen box 201 and larger than the screen holes of the lower screen box 201 fall into the lower screen box 201, slide along the inclined surface of the lower screen box 201 to the left opening, and enter the lower guide shell 4 on the left side through the discharge hopper 204, then are introduced into the small-sized particle pipe; the finest-sized stones smaller than the screen holes of the lower screen box 201 pass through the screen holes and are discharged from the bottom opening of the pipe box 1, completing the four-stage grading and screening; the entire process is continuous until the stone conveying ends or the equipment stops.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grading and screening device for mining stone, comprising a pipe box (1), characterized in that: The pipe box (1) is equipped with a grading and screening mechanism (2) that is slidably connected to the pipe box (1). The outside of the pipe box (1) is fixedly connected to a transmission mechanism (3) that is connected to the grading and screening mechanism (2). The left and right sides of the pipe box (1) are fixedly connected to a flow guide shell (4) that communicates with the grading and screening mechanism (2). The front and back sides of the pipe box (1) are equipped with a linkage mechanism (5) that is connected to the grading and screening mechanism (2). The grading and screening mechanism (2) includes three sieve boxes (201) arranged at inclinations to each other, and the three sieve boxes (201) are distributed vertically at equal distances. The transmission mechanism (3) includes a mounting plate (301), which is fixedly connected to the side of the pipe box (1). A camel wheel (302) is rotatably connected to the front of the mounting plate (301). A motor (303) whose output end is fixedly connected to the camel wheel (302) is fixedly connected to the back of the mounting plate (301). A push shaft (304) is fixedly connected to the front of the camel wheel (302). A connecting rod (305) is rotatably connected to the outside of the push shaft (304). A push rod (306) that passes through the pipe box (1) and is fixedly connected to the outside of the intermediate screen box (201) is rotatably connected to one end of the connecting rod (305). The linkage mechanism (5) includes a mounting block (501) and two linkage blocks (502). The mounting block (501) is located between the two linkage blocks (502). The mounting block (501) and the two linkage blocks (502) are fixedly connected to the outside of the three sieve boxes (201). Rotating seats (503) are fixedly connected to the upper and lower sides of the mounting block (501). The two rotating seats (503) are rotatably connected to the interior of the two rotating seats (503), and linkage rods (504) passing through the upper and lower linkage blocks (502) are respectively. The interior of the two linkage blocks (502) is provided with swing grooves (505) that are adapted to the linkage rods (504). The interior of the two linkage rods (504) is provided with linkage grooves (506). The interior of the two swing grooves (505) is fixedly connected with limiting rods (507) passing through the linkage grooves (506).

2. The grading and screening equipment for ore as described in claim 1, characterized in that: The pipe box (1) can be connected to the stone conveying pipe. The pipe box (1) has six funnel-shaped guide plates (6) fixedly connected inside. The six guide plates (6) are arranged in pairs above the three screen boxes (201).

3. The grading and screening equipment for ore as described in claim 1, characterized in that: The grading and screening mechanism (2) also includes six sliders (202). The six sliders (202) are fixedly connected to the front and back sides of the three screen boxes (201). The front and back sides of the pipe box (1) are provided with three sliding grooves (203) that are adapted to the sliders (202). The inner diameter of the screen holes of the three screen boxes (201) decreases from top to bottom. The left side of the upper and lower screen boxes (201) and the right side of the middle screen box (201) are open. The open sides of the three screen boxes (201) are fixedly connected to a discharge hopper (204) that extends to the outside of the pipe box (1) and is located inside the three guide shells (4).

4. The grading and screening equipment for ore as described in claim 1, characterized in that: The transmission mechanism (3) is located between the two guide shells (4) on the left side. The transmission mechanism (3) is used to provide linear reciprocating motion for the intermediate screen box (201). The back of the mounting plate (301) is fixedly connected to the side of the pipe box (1) with two reinforcing ribs (7) located on the upper and lower sides of the motor (303).

5. The grading and screening equipment for ore according to claim 1, characterized in that: The three guide shells (4) are used to guide the screened ore to other conveying pipes. The top and bottom of the pipe box (1) are open. The left side of the pipe box (1) is fixedly connected to a stabilizer (8) that is slidably connected to the outside of the push rod (306).

6. The grading and screening equipment for ore as described in claim 1, characterized in that: The two linkage mechanisms (5) are used to link the upper and lower screen boxes (201) and the middle screen box (201) to move in opposite directions. The pipe box (1) is also fixedly connected to two shafts (9) on the front and back sides, which are slidably connected to two linkage rods (504). When the linkage rods (504) on both sides move, they can swing in opposite directions around the shafts (9), thereby driving the upper and lower screen boxes (201) to move in opposite directions.

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