A screening device and a crusher

Abstract

This application provides a screening device and a crusher, belonging to the field of stone screening technology. The screening device includes: a support, a first rotating drum, a reference rod, a top rod, an air supply mechanism, and a drive mechanism. The first rotating drum is mounted on the support. The first rotating drum has screen holes. The reference rod is located outside the first rotating drum and extends axially along the first rotating drum. The top rod is mounted on the reference rod and extends towards the first rotating drum. The top rod has an air guide channel and an air blowing hole. The air guide channel is located inside the top rod and extends axially along the top rod. The air blowing hole is located on the outer wall of the top rod and communicates with the air guide channel. The air guide channel of the top rod communicates with the air supply mechanism. The drive mechanism drives the reference rod to periodically approach and move away from the first rotating drum while driving the first rotating drum to rotate, so that the top rod periodically inserts into and withdraws from the screen holes. This effectively reduces the problem of insufficient screening and helps to improve screening accuracy.

Description

Technical Field

[0001] This application relates to the field of stone screening technology, and more specifically, to a screening device and a crusher. Background Technology

[0002] In stone processing, stone usually needs to be crushed in multiple stages by a crusher to meet different particle size requirements.

[0003] After each crushing process, the stone needs to be screened to classify the stone particles of different sizes in the crushed product. Different crushing operations will then be carried out for stone particles of different sizes.

[0004] In actual production, insufficient screening often occurs when screening stone materials.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] The first objective of this application is to provide a screening device that can effectively reduce the problem of insufficient screening and help improve screening accuracy.

[0007] The first objective of this application is to provide a crusher that can more precisely control the screening degree of stone particles during feeding and discharging, thereby improving the precision of stone processing.

[0008] The embodiments of this application are implemented as follows:

[0009] A screening device includes: a support, a first rotating drum, a reference rod, a top rod, an air supply mechanism, and a drive mechanism.

[0010] The first rotating drum is rotatably mounted on the support. The first rotating drum has sieve holes that penetrate its side wall.

[0011] The reference rod is located outside the first rotating cylinder and extends along the axial direction of the first rotating cylinder. The reference rod is slidably mounted on the bracket along the radial direction of the first rotating cylinder.

[0012] The push rod is installed on the reference rod and extends toward the first rotating cylinder.

[0013] The push rod has an air guide channel and an air blowing hole. The air guide channel is located inside the push rod and extends along the axial direction of the push rod. The air blowing hole is opened on the outer wall of the push rod and communicates with the air guide channel.

[0014] Both the first rotating drum and the reference rod are driven by the drive mechanism. The air guide channel of the push rod is connected to the air supply mechanism.

[0015] The drive mechanism is used to drive the reference rod to periodically approach and move away from the first rotating drum while driving the first rotating drum to rotate, so that the top rod is periodically inserted into and withdrawn from the screen hole, thereby cleaning the screen hole with the airflow blown from the air hole.

[0016] Furthermore, a distance sensor is also provided on the outer wall of the push rod, with multiple distance sensors spaced apart along the circumference of the push rod. The distance sensors are located on the side of the air inlet away from the reference rod.

[0017] Furthermore, the opening of the air vent is oriented away from the distance sensor.

[0018] Furthermore, the screening device also includes a cover.

[0019] The cover is located outside the first rotating cylinder and extends along the axial direction of the first rotating cylinder, with the opening of the cover facing the first rotating cylinder. The cross-section of the cover is U-shaped.

[0020] The push rod passes through the side of the cover away from the first rotating cylinder, and along the axial direction of the push rod, the push rod can be slidably fitted into the cover.

[0021] When the drive mechanism drives the reference rod, the top rod can extend out of the cover through the opening of the cover.

[0022] Furthermore, the drive mechanism includes: a driver, a first rotating wheel, a second rotating wheel, a synchronizing rod, and a control shaft.

[0023] The control shaft is rotatably mounted on the bracket.

[0024] The first and second rotating wheels are coaxial and spaced apart. Both the first and second rotating wheels are rotatably mounted on the bracket. The first and second rotating wheels are located on opposite sides of the control shaft and are symmetrically arranged with respect to the control shaft.

[0025] The rotation axes of the first and second rotating wheels are set perpendicular to the rotation axis of the control shaft.

[0026] The control shaft has a radial through hole that passes through it, and the radial through hole extends into a strip shape along the axial direction of the control shaft.

[0027] The first rotating wheel is driven by the driver, and the first rotating wheel is driven by the first rotating drum.

[0028] The synchronizing rod passes through a radial through hole. One end of the synchronizing rod is eccentrically connected to the first rotating wheel, and the other end of the synchronizing rod is eccentrically connected to the second rotating wheel, so that when the driver is activated, the synchronizing rod can drive the control shaft to reciprocate.

[0029] Furthermore, the gas supply mechanism includes: a first gas cylinder, a first piston, and a first moving seat.

[0030] One end of the first air cylinder is closed by the first sealing plate. The inner diameter of the first air cylinder is larger than the outer diameter of the synchronizing rod. The first air cylinder surrounds the synchronizing rod and is arranged along the axial direction of the synchronizing rod. The synchronizing rod passes through the first sealing plate.

[0031] The first piston is annular and is slidably fitted onto the synchronizing rod. The first piston is slidably fitted inside the first air cylinder.

[0032] Along the axial direction of the control shaft, a first slide rail is provided on the wall of the radial through hole, and the first moving seat is slidably fitted onto the first slide rail.

[0033] The first motion seat has a first mating ball, which can rotate omnidirectionally to fit the first motion seat, and the synchronizing rod passes through the first mating ball.

[0034] The synchronizing rod and the first mating ball are coaxially arranged. Along the axial direction of the synchronizing rod, the synchronizing rod is slidably fitted to the first mating ball. Along the circumferential direction of the synchronizing rod, the synchronizing rod is rotatably fitted to the first mating ball.

[0035] The first mating ball and the first piston are connected by a connector.

[0036] The first sealing plate is equipped with an air intake channel and an air exhaust channel, both of which are configured with a one-way structure. The exhaust channel is connected to the air guide channel.

[0037] Furthermore, the gas supply mechanism also includes: a second gas cylinder, a second piston, and a second moving seat.

[0038] One end of the second air cylinder is closed by the second sealing plate. The inner diameter of the second air cylinder is larger than the outer diameter of the synchronizing rod. The second air cylinder surrounds the synchronizing rod and is arranged along the axial direction of the synchronizing rod. The synchronizing rod passes through the second sealing plate.

[0039] The second piston is annular and is slidably fitted onto the synchronizing rod. The second piston is slidably fitted inside the second air cylinder.

[0040] Along the axial direction of the control shaft, a second slide rail is provided on the wall of the radial through hole, and the second motion seat is slidably fitted onto the second slide rail.

[0041] The second motion seat has a second mating ball, which can rotate omnidirectionally to fit into the second motion seat, and the synchronizing rod passes through the second mating ball.

[0042] The synchronizing rod and the second mating ball are coaxially arranged. Along the axial direction of the synchronizing rod, the synchronizing rod is slidably fitted to the second mating ball. Along the circumferential direction of the synchronizing rod, the synchronizing rod is rotatably fitted to the second mating ball.

[0043] The second mating ball and the second piston are connected by a connector.

[0044] The second sealing plate is equipped with an air intake channel and an air exhaust channel, both of which are configured with a one-way structure. The exhaust channel is connected to the air guide channel.

[0045] Furthermore, a first air chamber and a second air chamber are provided on one end wall of the control shaft. Both the first air chamber and the second air chamber extend along the axial direction of the control shaft. The first air chamber is provided corresponding to the first slide rail, and the second air chamber is provided corresponding to the second slide rail.

[0046] A third piston is slidably fitted inside the first air chamber. The third piston is connected to a first piston rod, which extends axially along the first air chamber and passes through a radial through hole. The first piston rod is connected to the first moving seat.

[0047] A fourth piston is slidably fitted inside the second air chamber. The fourth piston is connected to a second piston rod, which extends axially along the second air chamber and passes through a radial through hole. The second piston rod is connected to the second moving seat.

[0048] The control shaft has a first air chamber and a second air chamber at one end, and an end seat is provided at the other end, which fits against the end wall of the control shaft.

[0049] The end seat has a first cavity and a second cavity on the side near the control shaft. Both the first cavity and the second cavity extend continuously in an arc shape along the circumference of the control shaft, and the first cavity and the second cavity are spaced apart.

[0050] The control shaft is rotatably fitted to the end seat, and there is a rotational seal between the two.

[0051] Both the first and second air chambers are equipped with filters for filtering dust at their openings.

[0052] An exhaust pipe communicating with the first chamber and a dust discharge pipe communicating with the second chamber are provided on the side of the end seat away from the control shaft. The exhaust pipe communicates with the internal space of the first rotating drum, and the dust discharge pipe communicates with the dust collection device.

[0053] When the distance between the first moving seat and the first air chamber reaches its minimum and maximum, the first air chamber and the second air chamber are just sealed by the end seat.

[0054] When the distance between the first motion seat and the first air chamber is not the minimum or the maximum, one of the first chamber and the second chamber is connected to the first air chamber, and the other of the first chamber and the second chamber is connected to the second air chamber.

[0055] A crusher includes: a crusher body and the screening device described above.

[0056] The screening device is located at the feed inlet and / or discharge outlet of the crusher body.

[0057] The beneficial effects of the technical solutions in this application include:

[0058] The screening device provided in this application embodiment can effectively reduce the problem of insufficient screening and help improve screening accuracy. The crusher provided in this application embodiment can more accurately control the screening degree of stone particles during feeding and discharging, thereby improving the accuracy of stone processing. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 A schematic diagram (side view) of the cooperation between the first and second rotating drums of the screening device provided in the embodiments of this application.

[0061] Figure 2 This is a schematic diagram of the cooperation between the first and second rotating cylinders (view from the end face direction).

[0062] Figure 3 This is a schematic diagram showing the assembly status of the reference rod, top rod, and cover (when the air inlet and distance sensor are located inside the cover).

[0063] Figure 4 This is a structural diagram of the reference rod, top rod, and cover.

[0064] Figure 5 This is a schematic diagram showing the assembly of the reference rod, top rod, and cover (when the distance sensor extends into the sieve hole).

[0065] Figure 6 This is a schematic diagram showing the assembly of the reference rod, the top rod, and the cover (when the air hole extends into the sieve hole).

[0066] Figure 7 This is a schematic diagram of the drive mechanism's state (initial state).

[0067] Figure 8 This is a schematic diagram of the control axis structure;

[0068] Figure 9 for Figure 7 A schematic diagram of the status of the first air cylinder;

[0069] Figure 10 This is a schematic diagram of the drive mechanism (when the first and second rotating wheels have rotated 90° relative to their initial state).

[0070] Figure 11 for Figure 10 A schematic diagram of the status of the first air cylinder;

[0071] Figure 12 This is a schematic diagram of the drive mechanism (when the first and second rotating wheels have rotated 180° relative to their initial state).

[0072] Figure 13 This is a schematic diagram showing the connection between the first air chamber, the second air chamber, the first cavity body, and the second cavity body (initial state).

[0073] Figure 14 This is a schematic diagram showing the coordination of the first air chamber, the second air chamber, the first cavity body, and the second cavity body (after the first and second rotating wheels start to rotate relative to their initial state).

[0074] Explanation of reference numerals in the attached figures:

[0075] First rotating drum 100; sieve hole 110; second rotating drum 200; mating flange 210; reference rod 300; top rod 310; air guide channel 311; air blowing hole 312; distance sensor 320; cover 330; first rotating wheel 410; second rotating wheel 420; synchronous rod 430; control shaft 500; radial through hole 510; first slide rail 511; first moving seat 512; first mating ball 513; second slide rail 514; second moving seat 515; second mating ball 516; first air chamber 520; third piston 521; first stopper rod 522; second air chamber 530; fourth piston 531; second stopper rod 532; filter element 540; first air cylinder 600; first sealing plate 610; first piston 620; connector 630; end seat 700; first cavity 710; air extraction pipe 711; second cavity 720; dust discharge pipe 721. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0077] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0078] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0079] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0080] Furthermore, the terms "vertical" and "parallel" do not mean that the parts must be absolutely vertical or parallel, but can be slightly tilted.

[0081] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0082] The inventors of this application have discovered that in actual production, when screening stone materials, if the screen holes 110 are blocked to a certain extent, for example, if the walls of the screen holes 110 are covered with mud, it will directly affect the passage of stone particles through the screen holes 110. This will cause some smaller particles to be unable to pass through the screen holes 110 smoothly, resulting in these smaller particles remaining in the group of larger particles, thus causing the problem of "insufficient screening".

[0083] The technical solutions of this application will be described by way of example through some embodiments below.

[0084] To overcome the shortcomings of existing technologies, see Figures 1-4 This application provides a screening device, which includes: a support (not shown in the figure), a first rotating drum 100, a reference rod 300, a top rod 310, an air supply mechanism, and a drive mechanism.

[0085] The first rotating drum 100 is cylindrical and rotatably mounted on a support. The first rotating drum 100 has sieve holes 110 penetrating its sidewalls. The sieve holes 110 are arranged in an array on the sidewalls of the first rotating drum 100. One end of the first rotating drum 100 is used for feeding (i.e., the feed end), and the other end is used for discharging (i.e., the discharge end). In the height direction, the feed end of the first rotating drum 100 is higher than the discharge end.

[0086] In this embodiment, the screening device further includes a second rotating drum 200. The second rotating drum 200 is also cylindrical. The inner diameter of the second rotating drum 200 is larger than the outer diameter of the first rotating drum 100. The second rotating drum 200 is coaxially arranged with the first rotating drum 100, and the second rotating drum 200 can also be rotatably mounted on the support.

[0087] The first rotating drum 100 is located inside the second rotating drum 200. The feed end of the first rotating drum 100 is flush with the end of the second rotating drum 200, and the discharge end of the first rotating drum 100 extends beyond the end of the second rotating drum 200.

[0088] In this embodiment, the inner wall of the second rotating drum 200 has a mating flange 210. The mating flange 210 extends continuously in a ring shape along the circumference of the second rotating drum 200. The mating flange 210 is located at one end of the second rotating drum 200 near the feed end of the first rotating drum 100. The inner ring wall of the mating flange 210 is fixedly connected to the outer wall of the first rotating drum 100. The mating flange 210 is flush with the end face of the feed end of the first rotating drum 100.

[0089] The sieve holes 110 of the first rotating drum 100 are all located within the second rotating drum 200.

[0090] The reference rod 300 is located outside the first rotating cylinder 100 and inside the second rotating cylinder 200. The reference rod 300 extends axially along the first rotating cylinder 100 and is spaced apart from the outer wall of the first rotating cylinder 100 and the inner wall of the second rotating cylinder 200. The reference rod 300 extends from the end of the second rotating cylinder 200 away from the mating flange 210 to the outside of the second rotating cylinder 200, and the end of the reference rod 300 away from the mating flange 210 is engaged with the bracket.

[0091] The reference rod 300 is slidably mounted on the bracket along the radial direction of the first rotating cylinder 100.

[0092] The rotation axis of the first rotating drum 100 is set to coincide with its central axis, and the rotation axis of the second rotating drum 200 is set to coincide with its central axis.

[0093] The top rod 310 is installed on the reference rod 300. There are multiple top rods 310. All top rods 310 are set perpendicular to the reference rod 300 and are located on the side of the reference rod 300 close to the first rotating cylinder 100. All top rods 310 extend toward the first rotating cylinder 100.

[0094] In this embodiment, all push rods 310 are arranged radially along the first rotating drum 100, and all push rods 310 are evenly spaced along the length of the reference rod 300. The central axes of all push rods 310 are located in the same plane, and the central axes of all push rods 310, the reference rod 300, and the first rotating drum 100 are coplanar. This plane is denoted as plane S. The angle between plane S and the horizontal plane is equal to the angle between the central axis of the first rotating drum 100 and the horizontal plane.

[0095] The push rod 310 has an air guide channel 311 and an air blowing hole 312. The air guide channel 311 is located inside the push rod 310 and extends along the axial direction of the push rod 310. The air blowing hole 312 is opened on the outer side wall of the push rod 310 and communicates with the air guide channel 311.

[0096] The first rotating drum 100, the second rotating drum 200, and the reference rod 300 are all driven by the drive mechanism. The air guide channel 311 of the push rod 310 is connected to the air supply mechanism.

[0097] The gas supply mechanism is used to supply gas to the gas guide channel 311.

[0098] During operation, the drive mechanism drives the first rotating drum 100 and the second rotating drum 200 to rotate. The stone material is fed into the first rotating drum 100 from the feed end. After being screened by the first rotating drum 100, the coarse particles remain inside the first rotating drum 100 and move along the first rotating drum 100 towards the discharge end of the first rotating drum 100. The fine particles that can pass through the screen holes 110 fall onto the inner wall of the second rotating drum 200 and move along the second rotating drum 200 towards the discharge end of the second rotating drum 200, thus completing the screening of coarse and fine stone particles.

[0099] The drive mechanism, while driving the first rotating drum 100 and the second rotating drum 200 to rotate, also drives the reference rod 300 to periodically approach and move away from the first rotating drum 100, so that the top rod 310 is periodically inserted into and withdrawn from the sieve hole 110 along the radial direction of the first rotating drum 100. That is, when the drive mechanism drives the first rotating drum 100 to rotate, every time a sieve hole 110 moves to the top rod 310, the drive mechanism will drive the reference rod 300 to make the top rod 310 extend into the sieve hole 110 and withdraw from the sieve hole 110. In other words, when each sieve hole 110 moves to the top rod 310, the top rod 310 will extend into the sieve hole 110 and then withdraw from the sieve hole 110, that is, it will perform the action of "extending in and then withdrawing".

[0100] When the push rod 310 extends into the screen hole 110, the air blowing hole 312 of the push rod 310 will move to the screen hole 110, thereby using the airflow blown out from the air blowing hole 312 to clean the screen hole 110.

[0101] With this design, on the one hand, the top rod 310 can be used to push out the stones that may be stuck in the screen hole 110, and on the other hand, the airflow blown out by the air hole 312 can be used to clean the soil that may be attached to the screen hole 110, so as to avoid the soil blocking the stone particles that could originally pass through the screen hole 110 and causing insufficient screening.

[0102] Overall, the screening device provided in this application embodiment can effectively reduce the problem of insufficient screening and help improve screening accuracy.

[0103] Specifically, in this embodiment, a distance sensor 320 is also provided on the outer wall of the top rod 310. Multiple distance sensors 320 are evenly spaced along the circumference of the top rod 310. The distance sensor 320 is located on the side of the air hole 312 away from the reference rod 300.

[0104] The opening direction of the air blowing hole 312 is towards the side away from the distance sensor 320. That is to say, the air blowing hole 312 is towards the side away from the air guide channel 311, and also towards the side away from the distance sensor 320 (towards the side where the reference rod 300 is located).

[0105] Optionally, the air guide channel 311 is coaxially arranged with the push rod 310, and the angle between the central axis of the air blowing hole 312 and the central axis of the push rod 310 is 45°, but is not limited to this.

[0106] With this design, when the push rod 310 extends into the sieve hole 110, the distance sensor 320 will enter the sieve hole 110 before the air blowing hole 312. When the distance sensor 320 moves into the sieve hole 110, it can detect the distance to the hole wall of the sieve hole 110. The processor can determine whether there is soil in the sieve hole 110 based on the detection data. Figure 5 As shown.

[0107] After the distance sensor 320 has completely passed through the sieve hole 110, the air blowing hole 312 enters the sieve hole 110 and uses airflow to clean the sieve hole 110, such as Figure 6 As shown.

[0108] When the push rod 310 exits from the sieve hole 110, the air blowing hole 312 leaves the sieve hole 110 first, and then the distance sensor 320 will re-enter the sieve hole 110. When the distance sensor 320 moves into the sieve hole 110 again, the distance sensor 320 can detect the distance to the hole wall of the sieve hole 110. The processor can then determine whether there is still dirt left in the sieve hole 110 based on the detection data, thereby helping to determine whether the airflow blown out by the air blowing hole 312 has cleaned the sieve hole 110.

[0109] The distance sensor 320 extends into the sieve hole 110 before the air blowing hole 312, which facilitates the detection of whether there is soil in the sieve hole 110. This makes it easier to control the moisture content of the stone and reduce the amount of soil adhering.

[0110] In addition, when the airflow from the air blowing hole 312 cleans the screen hole 110, the airflow direction is towards the outside of the first rotating drum 100. That is to say, the soil and mud clods cleaned out of the screen hole 110 will be blown directly out of the first rotating drum 100 (inside the second rotating drum 200) with the airflow, thereby preventing the mud clods from returning to the first rotating drum 100 and requiring sieving again, thus improving the sieving efficiency.

[0111] Furthermore, the screening device also includes: a cover 330.

[0112] The cover 330 is located outside the first rotating cylinder 100 and inside the second rotating cylinder 200. The cover 330 extends along the axial direction of the first rotating cylinder 100, and the opening of the cover 330 faces the first rotating cylinder 100.

[0113] The cross-section of the cover 330 is U-shaped.

[0114] The push rod 310 passes through the middle part of the side of the cover 330 away from the first rotating cylinder 100, and the push rod 310 is slidably fitted to the cover 330 along the axial direction of the push rod 310.

[0115] When the drive mechanism drives the reference rod 300, the air blowing hole 312 of the top rod 310 and the distance sensor 320 can extend out of the cover 330 through the opening of the cover 330.

[0116] With this design, when the top rod 310 exits from the sieve hole 110 and the air blowing hole 312 and the distance sensor 320 return to the cover 330, the airflow blown out by the air blowing hole 312 is guided by the cover 330 and blown out from the opening of the cover 330. The blown airflow can clean the surface of the distance sensor 320, preventing dust from adhering to the distance sensor 320 and affecting the detection accuracy. At the same time, it can also clean the inside of the cover 330.

[0117] In this embodiment, please refer to Figures 7-12 The drive mechanism includes: a driver (not shown in the figure), a first rotating wheel 410, a second rotating wheel 420, a synchronizing rod 430, and a control shaft 500.

[0118] The control shaft 500 is rotatably mounted on the bracket, and the rotation axis of the control shaft 500 is set to coincide with its central axis.

[0119] The first rotating wheel 410 and the second rotating wheel 420 are coaxial and spaced apart, and the first rotating wheel 410 and the second rotating wheel 420 have the same diameter.

[0120] The first rotating wheel 410 and the second rotating wheel 420 are both rotatably mounted on the bracket. The rotation axis of the first rotating wheel 410 coincides with its central axis, and the rotation axis of the second rotating wheel 420 also coincides with its central axis. The rotation axes of both the first rotating wheel 410 and the second rotating wheel 420 are perpendicular to the rotation axis of the control shaft 500, and the rotation axes of both the first rotating wheel 410 and the second rotating wheel 420 are coplanar with the rotation axis of the control shaft 500.

[0121] The first rotating wheel 410 and the second rotating wheel 420 are respectively disposed on opposite sides of the control shaft 500, and the first rotating wheel 410 and the second rotating wheel 420 are symmetrically arranged with respect to the control shaft 500. The distance between the rotation axis of the control shaft 500 and the first rotating wheel 410 is a first distance, and the distance between the rotation axis of the control shaft 500 and the second rotating wheel 420 is a second distance, and the first distance and the second distance are the same.

[0122] The control shaft 500 has a radial through hole 510 through which it passes, and the radial through hole 510 extends into a strip shape along the axial direction of the control shaft 500. The rotation axis of the first rotating wheel 410 and the second rotating wheel 420 are arranged to coincide with the central axis of the radial through hole 510.

[0123] The first rotating wheel 410 is driven by the driver and is in a transmission engagement with the first rotating drum 100.

[0124] Synchronizing rod 430 passes through radial through hole 510. One end of synchronizing rod 430 is eccentrically connected to first rotating wheel 410, and the other end of synchronizing rod 430 is eccentrically connected to second rotating wheel 420. The rotation axis of the first rotating wheel 410 and the second rotating wheel 420 intersects the central axis of synchronizing rod 430. The intersection point of the rotation axis of the first rotating wheel 410 and the second rotating wheel 420 with the central axis of synchronizing rod 430 is recorded as the center point of synchronizing rod 430.

[0125] In this embodiment, the synchronizing rod 430 is cylindrical.

[0126] The center point of the synchronizing rod 430 is set to coincide with the center of gravity of the synchronizing rod 430.

[0127] When the driver is activated, the first rotating wheel 410 rotates and drives the first rotating drum 100. The first rotating wheel 410 also synchronously drives the second rotating wheel 420 to rotate via the synchronizing rod 430. During the movement of the first rotating wheel 410 and the second rotating wheel 420, the synchronizing rod 430 drives the control shaft 500 to reciprocate, thereby causing the control shaft 500 to drive the reference rod 300 to reciprocate relative to the first rotating drum 100.

[0128] Furthermore, the gas supply mechanism includes: a first gas cylinder 600, a first piston 620, and a first moving seat 512.

[0129] The first air cylinder 600 is cylindrical, and one end of the first air cylinder 600 is closed by the first sealing plate 610. The inner diameter of the first air cylinder 600 is larger than the outer diameter of the synchronizing rod 430. The first air cylinder 600 surrounds the synchronizing rod 430 and is arranged along the axial direction of the synchronizing rod 430. The first air cylinder 600 and the synchronizing rod 430 are coaxially arranged. The synchronizing rod 430 passes through the first sealing plate 610 and is fixedly connected to the first sealing plate 610. The synchronizing rod 430 and the first sealing plate 610 are sealed.

[0130] The first piston 620 is annular in shape and is slidably fitted onto the synchronizing rod 430. The first piston 620 is also slidably fitted inside the first air cylinder 600. Both the synchronizing rod 430 and the first air cylinder 600 are slidably sealed with the first piston 620.

[0131] Along the axial direction of the control shaft 500, the wall of the radial through hole 510 is provided with a first slide rail 511, and the first motion seat 512 is slidably fitted to the first slide rail 511.

[0132] The first motion seat 512 has a notch opened along the axial direction of the first rotating wheel 410. The first motion seat 512 has a first mating ball 513, which can be rotatably mated in the notch of the first motion seat 512. The synchronizing rod 430 passes through the first mating ball 513.

[0133] Synchronizing rod 430 is coaxially set with first mating ball 513.

[0134] Along the axial direction of the synchronizing rod 430, the synchronizing rod 430 is slidably fitted to the first mating ball 513. Along the circumferential direction of the synchronizing rod 430, the synchronizing rod 430 is rotatably fitted to the first mating ball 513.

[0135] The first mating ball 513 and the first piston 620 are connected by a connector 630. In this embodiment, the connector 630 is cylindrical, with its inner diameter being larger than the outer diameter of the synchronizing rod 430 and its outer diameter being smaller than the inner diameter of the first air cylinder 600.

[0136] The connector 630 is coaxially arranged with the synchronizing rod 430. One end of the connector 630 is engaged with the first piston 620, and the other end of the connector 630 is fixedly connected to the first mating ball 513. Along the circumferential direction of the synchronizing rod 430, the connector 630 is rotatably engaged with the first piston 620; along the axial direction of the synchronizing rod 430, the connector 630 is fixedly engaged with the first piston 620.

[0137] The first sealing plate 610 is provided with an air intake channel (not shown in the figure) and an air exhaust channel (not shown in the figure) that are connected to the first air cylinder 600. Both the air intake channel and the air exhaust channel are equipped with a one-way structure (not shown in the figure).

[0138] The one-way structure allows external gas to enter the first gas cylinder 600 through the intake channel, and prevents gas inside the first gas cylinder 600 from leaving the first gas cylinder 600 through the intake channel. The one-way structure also allows gas inside the first gas cylinder 600 to leave the first gas cylinder 600 through the exhaust channel, and prevents external gas from entering the first gas cylinder 600 through the exhaust channel.

[0139] The exhaust passage is connected to the air guide passage 311.

[0140] In this embodiment, the gas supply mechanism further includes: a second gas cylinder, a second piston, and a second motion seat 515.

[0141] The second air cylinder is cylindrical, with one end sealed by the second sealing plate. The inner diameter of the second air cylinder is larger than the outer diameter of the synchronizing rod 430. The second air cylinder surrounds the synchronizing rod 430 and is arranged along the axial direction of the synchronizing rod 430. The second air cylinder and the synchronizing rod 430 are coaxially arranged. The synchronizing rod 430 passes through the second sealing plate and is fixedly connected to the second sealing plate. A sealing treatment is applied between the synchronizing rod 430 and the second sealing plate.

[0142] The second piston is annular and is slidably fitted onto the synchronizing rod 430. The second piston is also slidably fitted inside the second air cylinder. Both the synchronizing rod 430 and the second air cylinder are slidably sealed to the second piston.

[0143] Along the axial direction of the control shaft 500, a second slide rail 514 is provided on the wall of the radial through hole 510, and the second motion seat 515 is slidably fitted to the second slide rail 514.

[0144] The second motion seat 515 has a notch opened along the axial direction of the second rotating wheel 420. The second motion seat 515 has a second mating ball 516, which can be rotatably mated in the notch of the second motion seat 515. The synchronizing rod 430 passes through the second mating ball 516.

[0145] Synchronizing rod 430 and second mating ball 516 are coaxially arranged.

[0146] Along the axial direction of the synchronizing rod 430, the synchronizing rod 430 is slidably fitted to the second mating ball 516. Along the circumferential direction of the synchronizing rod 430, the synchronizing rod 430 is rotatably fitted to the second mating ball 516.

[0147] The second mating ball 516 is connected to the second piston via a connector 630. In this embodiment, the connector 630 is cylindrical, with its inner diameter larger than the outer diameter of the synchronizing rod 430 and its outer diameter smaller than the inner diameter of the second air cylinder.

[0148] The connector 630 is coaxially arranged with the synchronizing rod 430. One end of the connector 630 is fitted to the second piston, and the other end of the connector 630 is fixedly connected to the second mating ball 516. Along the circumferential direction of the synchronizing rod 430, the connector 630 is rotatably fitted to the second piston; along the axial direction of the synchronizing rod 430, the connector 630 is fixedly fitted to the second piston.

[0149] The second sealing plate is provided with an air intake channel (not shown in the figure) and an air exhaust channel (not shown in the figure) that are connected to the second air cylinder. Both the air intake channel and the air exhaust channel are equipped with a one-way structure (not shown in the figure).

[0150] The one-way structure allows external gas to enter the second cylinder through the intake channel, while preventing gas inside the second cylinder from leaving through the intake channel. The one-way structure also allows gas inside the second cylinder to leave through the exhaust channel, while preventing external gas from entering the second cylinder through the exhaust channel.

[0151] The exhaust passage is connected to the air guide passage 311.

[0152] The driver is engaged with the reference rod 300.

[0153] In this embodiment, the air supply section consisting of the first air cylinder 600, the first sealing plate 610, the first piston 620 and the first mating ball 513 is centrally symmetrical with respect to the center of gravity of the synchronization rod 430 with respect to the air supply section consisting of the second air cylinder, the second sealing plate, the second piston and the second mating ball 516.

[0154] Specifically: Within the reciprocating rotation range of the control shaft 500, when the control shaft 500 is located in the middle of the rotation range, this state is considered the initial state of the control shaft 500. In this state, when the control shaft 500 is driven, the rotation angle that the control shaft 500 can rotate to both sides is the same. In this state, the distance sensor 320 of the push rod 310 and the air blowing hole 312 are both located inside the cover 330, and the distance between the push rod 310 and the first rotating drum 100 reaches its maximum.

[0155] In the initial state, the length of the synchronizing rod 430 within the radial through hole 510 reaches its maximum, such as... Figure 7 As shown, at this time, the distance between the first mating ball 513 and the first air cylinder 600 reaches its minimum, the distance between the second mating ball 516 and the second air cylinder reaches its minimum, and the gas content in the first air cylinder 600 and the second air cylinder reaches its minimum value.

[0156] When the driver drives the first rotating wheel 410 and the second rotating wheel 420 to rotate 90°, as Figure 10 As shown, the synchronizing rod 430 and the control shaft 500 are perpendicular to each other, and the length of the synchronizing rod 430 within the radial through hole 510 is at its minimum. At this time, the distance between the first mating ball 513 and the first air cylinder 600 is at its maximum, the distance between the second mating ball 516 and the second air cylinder is at its maximum, and the gas volume in the first air cylinder 600 and the second air cylinder reaches its maximum value. During this process, the driver drives the reference rod 300 to extend the push rod 310 into the sieve hole 110, but the air blowing hole 312 of the push rod 310 has not yet entered the sieve hole 110. During this rotation process, both the first air cylinder 600 and the second air cylinder draw in air.

[0157] When the driver continues to drive the first rotating wheel 410 and the second rotating wheel 420 to rotate 90°, as Figure 12As shown, the length of the synchronizing rod 430 within the radial through hole 510 reaches its maximum again. At this time, the distance between the first mating ball 513 and the first air cylinder 600 reaches its minimum, the distance between the second mating ball 516 and the second air cylinder reaches its minimum, and the gas content in the first air cylinder 600 and the second air cylinder reaches its minimum value. During this rotation process, both the first air cylinder 600 and the second air cylinder exhaust gas. The gas enters the top rod 310 through the exhaust channel and is blown out through the air blowing hole 312. During this process, the driver drives the reference rod 300 to make the top rod 310 continue to extend into the screen hole 110. The air blowing hole 312 passes through the screen hole 110, thereby using airflow to clean the screen hole 110.

[0158] When the driver continues to drive the first rotating wheel 410 and the second rotating wheel 420 to rotate 90°, the synchronizing rod 430 and the control shaft 500 are once again perpendicular to each other. The length of the synchronizing rod 430 within the radial through hole 510 reaches its minimum. At this time, the distance between the first mating ball 513 and the first air cylinder 600 reaches its maximum, and the distance between the second mating ball 516 and the second air cylinder reaches its maximum. The gas content in the first air cylinder 600 and the second air cylinder reaches its maximum value. During this rotation process, both the first air cylinder 600 and the second air cylinder draw in air. The driver drives the reference rod 300 to disengage the push rod 310 from the sieve hole 110, and the blowing hole 312 ceases to clean the sieve hole 110.

[0159] When the driver continues to drive the first rotating wheel 410 and the second rotating wheel 420 to rotate 90°, it returns to the state as before. Figure 7 In the state shown, the length of the synchronizing rod 430 within the radial through hole 510 reaches its maximum again. At this time, the distance between the first mating ball 513 and the first air cylinder 600 reaches its minimum, the distance between the second mating ball 516 and the second air cylinder reaches its minimum, and the gas content in the first air cylinder 600 and the second air cylinder reaches its minimum value. During this rotation process, both the first air cylinder 600 and the second air cylinder exhaust gas. The gas enters the top rod 310 through the exhaust channel and is blown out through the air blowing hole 312. During this process, the driver drives the reference rod 300 to return the air blowing hole 312 of the top rod 310 and the distance sensor 320 back into the cover 330. The gas blown out of the air blowing hole 312, guided by the cover 330, cleans the distance sensor 320 and the cover 330.

[0160] As the driver continues to drive the first rotating wheel 410 and the second rotating wheel 420 to rotate, the above process will be repeated, so it will not be described in detail here.

[0161] In this embodiment, the first slide rail 511 and the second slide rail 514 are symmetrically arranged with respect to the rotation axis of the control shaft 500.

[0162] Furthermore, a first air chamber 520 and a second air chamber 530 are provided on one end wall of the control shaft 500. Both the first air chamber 520 and the second air chamber 530 extend along the axial direction of the control shaft 500. The first air chamber 520 is provided corresponding to the first slide rail 511, and the second air chamber 530 is provided corresponding to the second slide rail 514.

[0163] The cavities of the first air chamber 520 and the second air chamber 530 are both cylindrical. The first air chamber 520 is coaxially arranged with the first motion seat 512, and the second air chamber 530 is coaxially arranged with the second motion seat 515.

[0164] A third piston 521 is slidably fitted inside the first air chamber 520. The third piston 521 is slidably sealed with the first air chamber 520. The third piston 521 is connected to a first stopper rod 522. The first stopper rod 522 extends along the axial direction of the first air chamber 520 and passes through the radial through hole 510. The first stopper rod 522 is fixedly connected to the first motion seat 512.

[0165] A fourth piston 531 is slidably fitted inside the second air chamber 530. The fourth piston 531 is slidably sealed with the second air chamber 530. The fourth piston 531 is connected to a second plug rod 532. The second plug rod 532 extends along the axial direction of the second air chamber 530 and passes through the radial through hole 510. The second plug rod 532 is fixedly connected to the second motion seat 515.

[0166] The control shaft 500 is provided with an end seat 700 at one end where the first air chamber 520 and the second air chamber 530 are provided. The end seat 700 is in contact with the end wall of the control shaft 500.

[0167] The end seat 700 has a first cavity 710 and a second cavity 720 on the side near the control shaft 500. Both the first cavity 710 and the second cavity 720 extend continuously in an arc shape along the circumference of the control shaft 500, and the first cavity 710 and the second cavity 720 are spaced apart.

[0168] The control shaft 500 is rotatably fitted to the end seat 700 and the two are rotatably sealed.

[0169] Both the first air chamber 520 and the second air chamber 530 are provided with filter elements 540 for filtering dust at their openings.

[0170] An exhaust pipe 711 communicating with the first cavity 710 and a dust discharge pipe 721 communicating with the second cavity 720 are provided on the side of the end seat 700 away from the control shaft 500. The exhaust pipe 711 communicates with the internal space of the second rotating drum 200, thereby indirectly communicating with the internal space of the first rotating drum 100. The dust discharge pipe 721 communicates with an external dust collection device.

[0171] In this embodiment, the width of the region between the first cavity 710 and the second cavity 720 is adapted to the diameter of the first air cavity 520 and the second air cavity 530.

[0172] When the distance between the first motion seat 512 and the first air chamber 520 reaches its minimum and maximum (i.e., in the aforementioned initial state, or when the aforementioned driver drives the first rotating wheel 410 and the second rotating wheel 420 to rotate 180° relative to the initial state), the first air chamber 520 and the second air chamber 530 are just closed by the end seat 700, as shown. Figure 13 As shown.

[0173] When the distance between the first motion seat 512 and the first air chamber 520 is not the minimum or the maximum, one of the first cavity 710 and the second cavity 720 is connected to the first air chamber 520, and the other of the first cavity 710 and the second cavity 720 is connected to the second air chamber 530.

[0174] Specifically, when the first rotating wheel 410 and the second rotating wheel 420 are in their initial state, the first air chamber 520 and the second air chamber 530 are just closed by the end seat 700. The first chamber 710 and the second chamber 720 are just not connected to the first air chamber 520, and the first chamber 710 and the second chamber 720 are also just not connected to the second air chamber 530. Figure 13 As shown. At this time, the distance between the first motion seat 512 and the first air chamber 520 reaches its minimum, and the distance between the second motion seat 515 and the second air chamber 530 reaches its maximum.

[0175] When the driver starts to rotate the first rotating wheel 410 and the second rotating wheel 420, the first moving seat 512 begins to move away from the first air chamber 520, and the second moving seat 515 begins to move closer to the second air chamber 530. The first air chamber 520 begins to draw in air, and the second air chamber 530 begins to exhaust air. Simultaneously, the synchronizing rod 430 drives the control shaft 500 to rotate to one side (denoted as the positive direction), causing the first air chamber 520 to deflect towards the side where the first cavity 710 is located and connect with the first cavity 710, while the second air chamber 530 deflects towards the side where the second cavity 720 is located and connects with the second cavity 720. Figure 14 As shown. The first air chamber 520 draws air from the first rotating drum 100 and the second rotating drum 200 through the suction pipe 711, and the second air chamber 530 discharges the air that was originally drawn in through the dust discharge pipe 721. When the second air chamber 530 is venting, it can use the airflow to backflush and clean the filter element 540, thereby removing the dust that was originally adsorbed on the filter element 540.

[0176] When the driver drives the first rotating wheel 410 and the second rotating wheel 420 to rotate 180° relative to their initial state, they enter the state as follows: Figure 12The state shown is as follows. At this time, the first air chamber 520 and the second air chamber 530 are just closed by the end seat 700, the first cavity 710 and the second cavity 720 are just not connected to the first air chamber 520, and the first cavity 710 and the second cavity 720 are also just not connected to the second air chamber 530. Figure 13 As shown. At this time, the distance between the second motion seat 515 and the first air chamber 520 reaches its minimum, and the distance between the first motion seat 512 and the second air chamber 530 reaches its maximum.

[0177] As the driver continues to drive the first rotating wheel 410 and the second rotating wheel 420 to rotate, the second moving seat 515 begins to move away from the second air chamber 530, and the first moving seat 512 begins to move closer to the first air chamber 520. The second air chamber 530 begins to draw in air, and the first air chamber 520 begins to exhaust air. Simultaneously, the synchronizing rod 430 drives the control shaft 500 to rotate to the other side (i.e., in the opposite direction), causing the first air chamber 520 to deflect towards the side where the second chamber 720 is located and connect with the second chamber 720, while the second air chamber 530 deflects towards the side where the first chamber 710 is located and connects with the first chamber 710. In this way, the second air chamber 530 draws in air from the first rotating drum 100 and the second rotating drum 200 through the suction pipe 711, and the first air chamber 520 exhausts the air it originally drew in through the dust discharge pipe 721. During exhaust, the first air chamber 520 can use the airflow to backflush and clean the filter element 540, thereby removing the dust that was originally adsorbed onto the filter element 540.

[0178] With this design, at any time, one of the first air chamber 520 and the second air chamber 530 is always in a state of sucking air from the first rotating drum 100 and the second rotating drum 200, while the other is in a state of exhausting air into the dust discharge pipe 721. This can keep the first rotating drum 100 and the second rotating drum 200 under low pressure, reducing the amount of dust falling outside the first rotating drum 100 and the second rotating drum 200.

[0179] In addition, the first air chamber 520 and the second air chamber 530 alternately draw in and exhaust air, which can clean their respective filter elements 540 in an alternating manner, preventing excessive dust from adhering to the filter elements 540 and affecting normal air intake and exhaust. The filter elements 540 effectively prevent dust from entering the first air chamber 520 and the second air chamber 530, ensuring the continuous stability of the air intake and exhaust functions of the first air chamber 520 and the second air chamber 530, while reducing the wear and corrosion of the third piston 521 and the fourth piston 531.

[0180] With the above design, all operations can be achieved with only a single power source (drive), and the various parts are highly coordinated.

[0181] This application also provides a crusher, which includes a crusher body and the aforementioned screening device. The screening device is located at the feed inlet and / or discharge outlet of the crusher body for screening the stone entering or leaving the crusher body, thereby facilitating the processing of stone of corresponding particle size by the crusher body at each stage and improving the processing accuracy of the crushing process.

[0182] In summary, the screening device provided in this application embodiment can effectively reduce the problem of insufficient screening and help improve screening accuracy. The crusher provided in this application embodiment can more precisely control the screening degree of stone particles during feeding and discharging, thereby improving the accuracy of stone processing.

[0183] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A screening device, characterized in that, include: Support frame, first rotating drum, reference rod, top rod, air supply mechanism, and drive mechanism; The first rotating drum is rotatably mounted on the bracket; The first rotating drum has sieve holes that penetrate its side wall; The reference rod is located outside the first rotating cylinder and extends along the axial direction of the first rotating cylinder; the reference rod is slidably mounted on the bracket along the radial direction of the first rotating cylinder. The top rod is mounted on the reference rod and extends toward the first rotating cylinder; The push rod has an air guide channel and an air blowing hole. The air guide channel is located inside the push rod and extends along the axial direction of the push rod. The air blowing hole is opened on the outer side wall of the push rod and communicates with the air guide channel. Both the first rotating drum and the reference rod are driven by the drive mechanism; the air guide channel of the top rod is connected to the air supply mechanism. The drive mechanism is used to drive the reference rod to periodically approach and move away from the first rotating drum while driving the first rotating drum to rotate, so that the top rod periodically inserts into the sieve hole and withdraws from the sieve hole, thereby cleaning the sieve hole with the airflow blown out from the air hole; The outer wall of the top rod is also provided with a distance sensor, and multiple distance sensors are arranged at intervals along the circumference of the top rod; the distance sensor is located on the side of the air hole away from the reference rod; The opening of the air inlet faces away from the distance sensor; The screening device further includes: a cover; The cover is disposed outside the first rotating cylinder and extends along the axial direction of the first rotating cylinder, and the opening of the cover faces the first rotating cylinder; the cross-section of the cover is U-shaped. The push rod passes through the cover on the side away from the first rotating cylinder, and along the axial direction of the push rod, the push rod is slidably engaged with the cover; When the drive mechanism drives the reference rod, the top rod can extend out of the cover through the opening of the cover.

2. The screening apparatus of claim 1, wherein, The drive mechanism includes: a driver, a first rotating wheel, a second rotating wheel, a synchronizing rod, and a control shaft; The control shaft is rotatably mounted on the bracket; The first and second rotating wheels are coaxially spaced and rotatably mounted on the bracket. The first and second rotating wheels are located on opposite sides of the control shaft and are symmetrically arranged with respect to the control shaft. The rotation axis of the first and second rotating wheels is perpendicular to the rotation axis of the control shaft; The control shaft has a radial through hole that passes through it, and the radial through hole extends into a strip shape along the axial direction of the control shaft; The first rotating wheel is driven by the driver, and the first rotating wheel is driven by the first rotating drum; The synchronizing rod passes through the radial through hole, with one end of the synchronizing rod eccentrically connected to the first rotating wheel and the other end of the synchronizing rod eccentrically connected to the second rotating wheel, so that when the driver is actuated, the synchronizing rod can drive the control shaft to reciprocate.

3. The screening apparatus of claim 2, wherein, The gas supply mechanism includes: a first gas cylinder, a first piston, and a first moving seat; One end of the first air cylinder is closed by a first sealing plate. The inner diameter of the first air cylinder is larger than the outer diameter of the synchronizing rod. The first air cylinder surrounds the synchronizing rod and is arranged along the axial direction of the synchronizing rod. The synchronizing rod passes through the first sealing plate. The first piston is annular and is slidably sleeved on the synchronizing rod. The first piston is slidably fitted inside the first air cylinder. Along the axial direction of the control shaft, the wall of the radial through hole is provided with a first slide rail, and the first moving seat is slidably fitted to the first slide rail; The first motion seat has a first mating ball, which can be rotatably mated to the first motion seat, and the synchronizing rod passes through the first mating ball; The synchronizing rod is coaxially arranged with the first mating ball; along the axial direction of the synchronizing rod, the synchronizing rod is slidably fitted with the first mating ball; along the circumferential direction of the synchronizing rod, the synchronizing rod is rotatably fitted with the first mating ball. The first mating ball is connected to the first piston via a connecting member; The first sealing plate is provided with an air intake channel and an air exhaust channel, both of which are configured with a one-way structure; the air exhaust channel is connected to the air guide channel.

4. The screening apparatus of claim 3, wherein, The gas supply mechanism further includes: a second gas cylinder, a second piston, and a second moving seat; One end of the second air cylinder is closed by the second sealing plate. The inner diameter of the second air cylinder is larger than the outer diameter of the synchronizing rod. The second air cylinder surrounds the synchronizing rod and is arranged along the axial direction of the synchronizing rod. The synchronizing rod passes through the second sealing plate. The second piston is annular and is slidably sleeved on the synchronizing rod. The second piston is slidably fitted inside the second air cylinder. Along the axial direction of the control shaft, the wall of the radial through hole is provided with a second slide rail, and the second motion seat is slidably fitted to the second slide rail; The second motion seat has a second mating ball, which can be rotatably mated to the second motion seat, and the synchronizing rod passes through the second mating ball; The synchronizing rod is coaxially arranged with the second mating ball; along the axial direction of the synchronizing rod, the synchronizing rod is slidably fitted with the second mating ball; along the circumferential direction of the synchronizing rod, the synchronizing rod is rotatably fitted with the second mating ball. The second mating ball and the second piston are connected by a connector; The second sealing plate is provided with an air intake channel and an air exhaust channel, both of which are configured with a one-way structure; the air exhaust channel is connected to the air guide channel.

5. The screening device according to claim 4, characterized in that, The control shaft is further provided with a first air chamber and a second air chamber on one end wall. The first air chamber and the second air chamber extend along the axial direction of the control shaft. The first air chamber is provided corresponding to the first slide rail, and the second air chamber is provided corresponding to the second slide rail. A third piston is slidably fitted inside the first air chamber. The third piston is connected to a first plug rod. The first plug rod extends along the axial direction of the first air chamber and passes through the radial through hole. The first plug rod is connected to the first moving seat. A fourth piston is slidably fitted inside the second air chamber. The fourth piston is connected to a second piston rod, which extends axially along the second air chamber and passes through the radial through hole. The second piston rod is connected to the second moving seat. The control shaft is provided with an end seat at one end where the first air chamber and the second air chamber are located, and the end seat is in contact with the end wall of the control shaft. The end seat has a first cavity and a second cavity on the side near the control shaft. Both the first cavity and the second cavity extend continuously in an arc shape along the circumference of the control shaft, and the first cavity and the second cavity are spaced apart. The control shaft is rotatably fitted to the end seat and the two are rotatably sealed. Both the first air chamber and the second air chamber are provided with filter elements for filtering dust at their openings; The end seat is provided with an air extraction pipe communicating with the first cavity and a dust discharge pipe communicating with the second cavity on the side away from the control shaft; the air extraction pipe is communicating with the internal space of the first rotating drum, and the dust discharge pipe is communicating with the dust collection device. When the distance between the first moving seat and the first air chamber reaches its minimum and maximum, the first air chamber and the second air chamber are just closed by the end seat; When the distance between the first motion seat and the first air chamber is not the minimum or the maximum, one of the first cavity and the second cavity is in communication with the first air chamber, and the other of the first cavity and the second cavity is in communication with the second air chamber.

6. A crusher, characterized in that, include: The crusher body and the screening device as described in any one of claims 1-5; The screening device is located at the feed inlet and / or discharge outlet of the crusher body.

Images