Jet flow crushing grader

Abstract

The invention discloses a jet flow smashing and grading machine, and relates to the technical field related to material grading, the jet flow smashing and grading machine comprises a discharging unit, a smashing unit and a jet flow grading unit which are sequentially arranged in the material conveying direction, and the jet flow grading unit comprises a jet flow pipe and a grading device; the classifier comprises a classification cavity and three material classification channels communicated with the classification cavity, a classification cutter is arranged between any two adjacent classification channels, an adjusting mechanism for adjusting the deflection angle of the classification cutter is further arranged on the classification cavity, and the classifier further comprises a passive compensation mechanism. According to the passive compensation mechanism, first compensation plates are arranged on the two side faces of a blade of each grading cutter, and each first compensation plate is in sliding connection with the side wall of the grading channel in the corresponding position. The position of the first compensation plate is changed based on the deflection force action of the corresponding grading cutter.

Description

Technical Field

[0001] The invention relates to the technical field related to material classification, in particular to a jet crushing classifier. Background Art

[0002] As is known, high-precision jet classifier is a device used for grading granular materials. Its working principle is mainly based on the different speeds of airflow and the physical properties of particles (such as density, shape and particle size) to achieve classification. Its basic working principle is as follows: Particle introduction: The high-precision jet classifier uses high-pressure gas to spray out from the nozzle at high speed to form a powerful jet, which guides the material particles into the classification chamber; the material is evenly fed into the classifier through the feeding device. When the particles come into contact with the high-speed airflow, the force exerted by the airflow on the particles will have different effects according to the size and density of the particles; In particle classification, smaller or lighter particles will be carried away by the airflow due to the buoyancy of the airflow and enter the airflow outlet or the upper collection device; larger or heavier particles are not easily carried away by the airflow due to gravity and inertia, and will sink to the bottom of the classifier and enter the lower collection device; by adjusting the airflow speed, nozzle angle and feed amount, the classification effect can be changed, thereby improving the accuracy and efficiency of classification; Collection and discharge: After classification, particles of different grades are collected through their respective outlets to achieve the purpose of classification.

[0003] For example, the patent with announcement number CN213612645U, announcement date July 6, 2021, and name "A New Polishing Powder Jet Classifier" includes a front cover and a fixed block, the interior of the front cover is provided with an observation window, one side of the front cover is provided with a classifier cavity, and one side of the classifier cavity is provided with a rear cover, the other side of the classifier cavity is provided with a rubber pad, and one side of the rubber pad is installed with a connecting plate, the inner wall of the connecting plate is installed with a jet tube, and the front end of the jet tube is connected to a connecting tube, the interior of the connecting tube is provided with a blade, one side of the connecting tube is connected to a feed pipe, and the front end of the feed pipe is provided with an air inlet, and one side of the feed pipe is provided with a feed port. This patent is connected by bolts in the classifier cavity. When the equipment needs maintenance or repair, you only need to unscrew the screws and remove the front cover to maintain the parts in the classifier cavity, and the operating status of the equipment can be observed through the observation window when the equipment is running, which is very convenient.

[0004] The shortcoming of the prior art is that, for the adjustment of the grading particle size, the worm is engaged with the gear by rotating the worm to drive the first grading knife or the second grading knife to move, so that the grading particle size can be adjusted to facilitate the screening of the material. However, after the position of the grading knife is adjusted, the concave situation between the channel through which the material flows and the side of the blade of the grading knife cannot maintain a smooth surface, so that the flow of the material in the concave is disturbed to form an eddy current. Since the particle size of the material particles is very small, the formation of the eddy current will seriously affect the flow of the material into the collection mechanism after classification. Summary of the invention

[0005] The purpose of the present invention is to provide a jet crushing classifier to solve the technical problems in the related art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A jet crushing and classifying machine comprises a feeding unit, a crushing unit and a jet classifying unit which are sequentially arranged along a material conveying direction; the jet classifying unit comprises a jet tube and a classifier; the classifier comprises a classifying chamber and three material classifying channels connected to the classifying chamber; a classifying knife is arranged between any two adjacent classifying channels; an adjusting mechanism for adjusting a deflection angle of the classifying knife is also arranged on the classifying chamber; and a passive compensation mechanism is also included; the passive compensation mechanism comprises first compensation plates arranged on both sides of the blade of each classifying knife, each first compensation plate is slidably connected to the side wall of the classifying channel at a corresponding position; the first compensation plate changes position based on the deflection force of the corresponding classifying knife.

[0007] As mentioned above, the grading knife includes a semicircular segment and a triangular segment. A deflection shaft is arranged at the center of the semicircular segment and is rotatably connected to the grading cavity. The width dimension of one end of the triangular segment away from the blade is greater than the radial dimension of the semicircular segment.

[0008] As mentioned above, the first compensation plate includes a main section and a secondary section. The main section is slidably arranged on the side wall of the grading channel, and the main section is elastic. Based on its own elastic force, it has a tendency to drive the secondary section to stick to the side wall of the grading channel.

[0009] As mentioned above, the end of the main section away from the auxiliary section is in an arc shape, and the inner arc surface faces the grading channel at the corresponding position.

[0010] As mentioned above, the end of the secondary section away from the main section is provided with an arc-shaped connecting block, which is slidably connected to the semicircular section; when the grading knife deflects in the direction away from any first compensation plate, the secondary section of the first compensation plate rolls against the arc surface of the semicircular section.

[0011] As mentioned above, each end of the connecting block connected to the semicircular segment is provided with an arc rod, which is slidably arranged along its own arc trajectory on the semicircular segment, and the center of the arc rod is at the junction of the sub-segment and the triangular segment; in the deflection stroke of the grading knife toward the direction close to any first compensation plate, the sub-segment of the first compensation plate is deflected relative to the semicircular segment along the center of the arc rod.

[0012] As mentioned above, the regulating mechanism comprises a worm wheel fixedly connected to the deflection shaft arranged on each semicircular segment and two worms rotatably arranged on the grading cavity, the two worm wheels correspond to the two worms one by one, and the worm wheels are meshed with the worms relative to each other.

[0013] As mentioned above, there is a gap between the teeth of the worm wheel and the teeth of the meshing worm, and the size of the gap is within the size range of the particle size of the material passed by the corresponding classification channel.

[0014] As mentioned above, after adjusting the deflection angle of any grading knife, the worm corresponding to the grading knife is fixed to the grading chamber by bolts.

[0015] As mentioned above, the blade portion of the triangular segment includes a fixed portion and a swing portion, the swing portion is swingably arranged on the fixed portion, and an elastic member is provided at the swinging position of the two.

[0016] The beneficial effect of the present invention is that by arranging the first compensation plate on both sides of the blade of each grading knife, the depression between the blade side of the grading knife and the side wall of the grading channel can be compensated after the grading knife is deflected by a certain angle, so as to ensure that the material can flow smoothly between the blade side of the grading knife and the side wall of the grading channel, so as to avoid the problem of eddy current. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the jet crushing and classifying machine provided in an embodiment of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of a jet classification unit of a jet pulverizing and classifying machine provided in an embodiment of the present invention; Figure 3 It is a schematic diagram of the exploded structure of the jet classification unit of the jet crushing and classifying machine provided in an embodiment of the present invention from a first perspective; Figure 4 A schematic diagram of an exploded structure from a second perspective of a jet classifying unit of a jet pulverizing classifier provided in an embodiment of the present invention; Figure 5 It is a schematic cross-sectional structure diagram of a jet classification unit of a jet pulverizing and classifying machine provided in an embodiment of the present invention; Figure 6 for Figure 5 A is an enlarged structural diagram; Figure 7 It is a schematic diagram of the three-dimensional structure of the lock adjustment mechanism of the jet crushing classifier provided in an embodiment of the present invention.

[0019] Description of reference numerals: 1. Feeding unit; 2. Crushing unit; 3. Jet grading unit; 30. Jet tube; 31. Grading chamber; 32. Grading channel; 33. Grading knife; 330. Semicircular segment; 331. Triangular segment; 332. Swinging part; 34. First compensation plate; 340. Main segment; 341. Sub-segment; 35. Connecting block; 36. Arc rod; 37. Second compensation plate; 38. Extension segment; 39. Connecting rod; 4. Adjusting mechanism; 40. Worm gear; 41. Worm; 42. Bolt; 5. Collecting mechanism. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, Figure 1 To Attachment Figure 7 The present invention is further described in detail.

[0021] An embodiment of the present invention provides a jet crushing and classifying machine, comprising a feeding unit 1, a crushing unit 2 and a jet classifying unit 3 arranged in sequence along a material conveying direction, the jet classifying unit 3 comprising a jet tube 30 and a classifier, the classifier comprising a classifying chamber 31 and three material classifying channels 32 connected to the classifying chamber 31, a classifying knife 33 is arranged between any two adjacent classifying channels 32, an adjustment mechanism 4 for adjusting the deflection angle of the classifying knife 33 is also provided on the classifying chamber 31, and also comprises a passive compensation mechanism; the passive compensation mechanism comprises first compensation plates 34 arranged on both sides of the blade of each classifying knife 33, each first compensation plate 34 is slidably connected to the side wall of the classifying channel 32 at the corresponding position; the first compensation plate 34 changes position based on the deflection force of the corresponding classifying knife 33.

[0022] Specifically, when some powdered granular materials are classified according to different particle size ranges, a high-precision jet classifier will be used, that is, the powdered granular materials will be first transported to the unloading unit 1, and the unloading unit 1 will push the materials into the jet classification unit 3 at a certain speed. However, in this process, the materials need to be crushed again to prevent agglomeration or the particle size of the materials exceeding the maximum particle size range after classification from entering the jet classification unit 3. Therefore, a crushing unit 2 will be added between the unloading unit 1 and the jet classification unit 3 to solve the above problem, and the jet classification unit 3 includes The jet tube 30 is connected to an external air pump, and a through hole for material to enter is opened on the jet tube 30. A classifier is arranged at the other end of the jet tube 30. That is, when the material enters the jet tube 30 from the through hole and contacts with the high-speed airflow, the force exerted by the airflow on the material particles will have different effects according to the size and density of the particles. Smaller or lighter particles will be carried away by the airflow due to the buoyancy of the airflow and enter the airflow outlet or the upper collecting device; larger or heavier particles are not easily carried away by the airflow due to the effects of gravity and inertia, and will sink to the bottom of the classifier and enter the lower collecting device, that is, a classifier is also arranged on the classification chamber 31. A grading channel 32 is provided for the outflow of materials of different particle sizes. Generally, the grading channels 32 of materials are divided into three types, which are used to convey coarse materials, medium materials and fine materials in sequence. For example, the particle size of the coarse materials is greater than 10, the particle size of the medium materials is between 5 and 10, and the particle size of the fine materials is less than 5. The angle between the grading channel 32 corresponding to the coarse materials and the jet tube 30 is the largest, the angle between the grading channel 32 corresponding to the medium materials and the jet tube 30 is the second largest, and the angle between the grading channel 32 corresponding to the fine materials and the jet tube 30 is the smallest. In this way, the buoyancy of the airflow can be used to grade the materials of different particle sizes. In order to change the particle size range of the material conveyed by the grading channel 32, a grading knife 33 can be set between two adjacent grading channels 32, and then an adjusting mechanism 4 can be set. According to actual needs, the deflection angle of the grading knife 33 can be adjusted by the adjusting mechanism 4, so as to control the opening size of the grading channel 32. The adjusting mechanism 4 for adjusting the deflection angle of the grading knife 33 can drive the grading knife 33 to deflect and limit the position of the grading knife 33 after deflection. This is the prior art and will not be described in detail. When the material is classified in the grading chamber 31 and flows out from different grading channels 32, it will be collected by different collecting mechanisms 5.

[0023] In the prior art, when the position of the grading knife 33 is adjusted, any part of its deflection path cannot be obstructed, otherwise the adjustment of the grading knife 33 will be restricted. In this way, on the deflection path, the end away from the blade cannot contact any part of the grading channel, and a depression will appear between the side wall of the grading channel 32 and the side of the blade of the grading knife 33. For example, if a depression appears on a smoothly transitioned surface, there is a large and obvious height difference between the depressed surface and the smooth surface. In this case, the material cannot flow smoothly through the surface, causing the flow of the material at the depression to be disturbed to form an eddy current. Since the particle size of the material particles is very small, at the micron level, the eddy current will seriously affect the flow of the material into the collection mechanism 5 after classification.

[0024] Based on the above problems, in the present embodiment, first compensation plates 34 are arranged on both sides of the grading knife 33, that is, when the grading knife 33 is driven to deflect, a recessed portion will appear between the end away from the blade and the side wall of the grading channel 32 on one side, and the deflection of the grading knife 33 can drive the first compensation plate 34 to move, and compensate for the recessed portion, so as to reduce the area of ​​the recessed portion as much as possible, so as to reduce the volume of the eddy current and reduce the impact on material transportation, wherein the first compensation plate 34 is slidingly arranged on the corresponding side wall of the grading channel 32, then a spring can be arranged between the first compensation plate 34 and the grading channel 32 in the sliding direction, that is, when the grading knife 33 approaches any first compensation plate 34 on both sides of its blade, the first compensation plate 34 on the other side will compensate for the recessed portion between the grading knife 33 and the side wall of the grading channel 32 under the action of the elastic force of the spring, and the first compensation plate 34 on one side will be squeezed by the grading knife 33 and move in the direction of the compression spring.

[0025] The beneficial effect of this embodiment is that by arranging the first compensation plates 34 on both sides of the blade of each grading knife 33, the depression between the blade side of the grading knife 33 and the side wall of the grading channel 32 can be compensated after the grading knife 33 is deflected by a certain angle, so as to ensure that the material can flow smoothly between the blade side of the grading knife 33 and the side wall of the grading channel 32 to avoid the problem of eddy current.

[0026] Furthermore, the grading knife 33 includes a semicircular segment 330 and a triangular segment 331 . A deflection shaft is provided at the center of the semicircular segment 330 and is rotatably connected to the grading cavity 31 . The width of one end of the triangular segment 331 away from the blade is greater than the radial dimension of the semicircular segment 330 .

[0027] Specifically, the deflection of the grading knife 33 will form a depression between one side and the side wall of a grading channel 32, and a protrusion will be formed on the other side on the side wall of the other grading channel 32, and the protrusion will also hinder the flow of materials. Therefore, in the present embodiment, the grading knife 33 is divided into a semicircular segment 330 and a triangular segment 331, that is, the semicircular segment 330 is the part of the grading knife 33 whose cross section is a semicircular structure after being radially cut from the deflection axis, and the triangular segment 331 is the part of the triangular structure in cross section. The semicircular segment 330 is opposite to the blade, and the radial dimension of the semicircular segment 330 is smaller than the width dimension of the end where the triangular segment 331 is connected to the semicircular segment 330. In this way, after the grading knife 33 is deflected, the semicircular segment 330 will not form a protrusion on the side wall of the grading channel 32, and the arc surface of the semicircular segment 330 does not contact any part of the grading cavity 31, so as to prevent the rotation of the semicircular segment 330 from being hindered.

[0028] Preferably, the first compensation plate 34 includes a main section 340 and a secondary section 341. The main section 340 is slidably arranged on the side wall of the grading channel 32, and the main section 340 is elastic. Based on its own elastic force, it has a tendency to drive the secondary section 341 to stick to the side wall of the grading channel 32.

[0029] Specifically, since it is necessary to always keep the side wall of the grading channel 32 smooth, after the first compensation plate 34 has been used for a long time, it may be deformed, such as no longer being basically completely in contact with the side wall of the grading channel 32, and being offset toward the center of the grading channel 32, which will affect the size of the conveyed material in the grading channel 32. Moreover, according to the aforementioned embodiment, it is also necessary for the first compensation plate 34 to maintain contact with the grading knife 33, and the deformed first compensation plate 34 is difficult to maintain contact with the grading knife 33. Therefore, in this embodiment, the first compensation plate 34 is set to have elastic The main section 340 is thicker than the secondary section 341, that is, based on the elastic force of the main section 340, the main section 340 and the secondary section 341 tend to always stick to the side wall of the grading channel 32, thereby extending the service life of the first compensation plate 34. In an optional embodiment, the end of the main section 340 away from the secondary section 341 can be set to an arc shape, and the inner arc surface faces the grading channel 32 at the corresponding position, so that the arc section can further give the rest of the main section 340 a force to stick to the side wall of the grading channel 32.

[0030] Although the aforementioned embodiment solves the problem of the bulge caused by the deflection of the grading knife 33, if the deflection angle of the grading knife 33 is large, such as when a certain grading channel 32 needs to be closed, the sub-segment 341 of the first compensation plate 34 can always be in sliding contact with the semicircular segment 330, but a depression will appear between the sub-segment 341 of the first compensation plate 34 and the end of the triangular segment 331 away from the blade. Therefore, in order to solve this problem, in a further embodiment, an arc-shaped connecting block 35 is provided at the end of the sub-segment 341 away from the main segment 340, and the connecting block 35 is slidably connected to the semicircular segment 330; in the deflection stroke of the grading knife 33 in the direction away from any first compensation plate 34, the sub-segment 341 of the first compensation plate 34 rolls on the arc surface of the semicircular segment 330.

[0031] Specifically, the arc-shaped connecting block 35 is slidably connected on the semicircular segment 330, and the sliding trajectory is consistent with the arc-shaped trajectory of the arc-shaped connecting block 35, and the connecting block 35 is at the junction of the semicircular segment 330 and the triangular segment 331. The side of the connecting block 35 facing the auxiliary segment 341 is also arc-shaped, and the center of the circle is on the same central axis as the center of the semicircular segment 330. In this way, when the grading knife 33 swings in a direction away from any first compensation plate 34, the connecting block 35 corresponding to the first compensation plate 34 will be driven by the semicircular segment 330 to deflect. There will be no relative rotation between the two, and the auxiliary segment 341 can undergo elastic deformation after being acted upon by an external force. Then, the deflection of the semicircular segment 330 tends to drive the auxiliary segment 341 to roll up and lean against the arc surface of the semicircular segment 330, and the radial dimension of the semicircular segment 330 can be further shortened. When the auxiliary segment 341 rolls up and leans against the arc surface of the semicircular segment 330, the superimposed thickness of the two can ensure that no bulge will appear while no depression will appear, that is, the auxiliary segment 341 and the triangular segment 331 are always in contact, so it is difficult for a depression to appear.

[0032] When the grading knife 33 deflects toward the direction approaching any first compensation plate 34, although it can produce a pushing effect on the auxiliary segment 341, relative rotation will occur between the connecting block 35 and the semicircular segment 330, so that a depression will also appear between the auxiliary segment 341 and the triangular segment 331. Therefore, in order to avoid the occurrence of the depression as much as possible, in a further embodiment, an arc rod 36 is provided at the end where each connecting block 35 is connected to the semicircular segment 330, and the arc rod 36 is slidably arranged on the semicircular segment 330 along its own arc trajectory, and the center of the arc rod 36 is at the junction of the auxiliary segment 341 and the triangular segment 331; in the deflection stroke of the grading knife 33 toward the direction approaching any first compensation plate 34, the auxiliary segment 341 of the first compensation plate 34 is deflected relative to the semicircular segment 330 along the center of the arc rod 36.

[0033] Specifically, the center of the arc rod 36 is at the junction of the corresponding sub-segment 341 and the triangular segment 331. When the grading knife 33 deflects toward any first compensation plate 34, the semicircular segment 330 and the connecting block 35 corresponding to the first compensation plate 34 rotate relative to each other. The center of rotation is at the position where the center of the arc rod 36 is located. The closer the center is to the junction of the sub-segment 341 and the triangular segment 331, close to the center of the grading channel 32, the smaller the depression between the sub-segment 341 and the triangular segment 331 will be, thereby better solving the eddy current problem.

[0034] Preferably, the adjustment mechanism 4 includes a worm wheel 40 fixedly connected to the deflection shaft arranged on each semicircular segment 330 and two worms 41 rotatably arranged on the grading chamber 31, the two worm wheels 40 correspond to the two worms 41 one by one, and the relative worm wheels 40 and worms 41 are meshed with each other; specifically, the corresponding meshing worm wheel 40 is driven to rotate by rotating the worm 41, so as to adjust the deflection angle of the grading knife 33, and the worm wheel 40 and worm 41 mechanism has self-locking property when the lead angle of the worm 41 is less than the equivalent friction angle between the meshing gear teeth, that is, the worm wheel 40 can only be driven to rotate by the worm 41 as the active member, and the worm wheel 40 cannot drive the worm 41 to move, so that after driving the grading knife 33 to deflect, the position of the grading knife 33 can be locked.

[0035] Furthermore, there is a gap between the teeth of the worm wheel 40 and the teeth of the meshing worm 41 , and the size of the gap is within the size range of the particle size of the material passing through the corresponding classification channel 32 .

[0036] Specifically, since there is a range of movement in the particle size of the material allowed to pass through each grading channel 32, when the maximum material particle size is allowed, if material is stuck at the junction of the grading channel 32 and the grading chamber 31, it will hinder the subsequent material flow, so it is necessary to solve the material blocking problem. In this embodiment, a gap is provided between the teeth of the worm wheel 40 and the corresponding teeth of the meshing worm 41, that is, on the basis of not affecting the power transmission, the grading knife 33 can swing when it is impacted by the airflow, and the swing range is within the range of the allowable material particle size. For example, the grading channel 32 corresponding to the medium material allows the particle size of the material to pass through to be between 5 and 10, then the swing range of the two grading knives 33 corresponding to the grading channel 32 can be between 4 and 6 and between 9 and 10, because the fine material can enter any grading channel 32, so the coarse material will not enter the medium material grading channel 32, and the medium material will not enter the fine material grading channel 32. When the grading knife 33 swings under the impact of the airflow, if there is a material blocking problem, it can also be solved to a certain extent.

[0037] In a further embodiment, the blade portion of the triangular segment 331 includes a fixed portion and a swinging portion 332, the swinging portion 332 is swingably arranged on the fixed portion, and elastic parts are provided at the swinging positions of the two, that is, the large particle materials are basically stuck on the blade of the grading knife 33, then by utilizing the effect of the grading knife 33 swinging under the impact of the airflow, the swinging portion 332 will swing on the fixed portion when it is blocked by the material during the swinging process of the triangular segment 331, then the size of the opening of the grading channel 32 at the blade of the grading knife 33 will become larger, and the large particle materials will fall, thereby better solving the problem of material jamming.

[0038] Since both side walls of the grading channel 32 corresponding to the medium material have the first compensation plates 34, when the two first compensation plates 34 are driven to move by the corresponding grading knives 33, there will not be much difference between the surfaces of the two. However, only the side walls close to the grading knives 33 of the grading channel 32 corresponding to the coarse material and the side walls of the grading channel 32 corresponding to the fine material have the first compensation plates 34, and the other side has no first compensation plates 34. Therefore, after the first compensation plates 34 are driven to move, there will be obvious differences in the surfaces of the two side walls. Therefore, when the materials in contact with the side walls flow, there will be a problem of being guided, which affects the flow of the materials. Therefore, in this embodiment, in the grading channel 32 corresponding to the coarse material, A second compensation plate 37 is slidably arranged on the side wall away from the grading knife 33, and a second compensation plate 37 is also slidably arranged on the side wall away from the grading knife 33 of the grading channel 32 corresponding to the fine material, and the first compensation plate 34 and the second compensation plate 37 in the grading channel 32 corresponding to the coarse material are connected by a connecting rod 39, and the first compensation plate 34 and the second compensation plate 37 in the grading channel 32 corresponding to the fine material are also connected by a connecting rod 39, and the connecting rod 39 is slidably arranged on the outer wall of the grading chamber 31, so that the movement of the first compensation plate 34 can drive the second compensation plate 37 to move synchronously, thereby ensuring that there is basically no obvious difference in the changes of the wall surfaces on both sides of the grading channel 32.

[0039] Furthermore, an extension section 38 is provided on the second compensation plate 37, and the extension section 38 is located on the two side walls corresponding to the grading chamber 31 and the end of the jet tube 30. When the second compensation plate 37 moves, the extension section 38 can also move with it, so that the material in contact with the extension section 38 is rubbed, and the swing part 332 can further solve the problem of material jamming, and the extension section 38 covers the surface of the two side walls of the grading chamber 31, thereby reducing the wear of the two side walls of the grading chamber 31. Compared with the repair of the grading chamber 31, the cost of replacing the extension section 38 is lower.

[0040] Preferably, after adjusting the deflection angle of any grading knife 33, the worm 41 corresponding to the grading knife 33 is fixed to the grading chamber 31 by a bolt 42; preferably, since the machine vibrates during jet grading, and in the aforementioned embodiment, there is a gap between the teeth of the worm wheel 40 and the corresponding meshing teeth of the worm 41, then the self-locking between the two may be loose. Therefore, in this embodiment, under the premise of not affecting the swing of the grading knife 33 affected by the impact of airflow, the worm 41 is locked to the outer shell of the grading chamber 31 by a bolt 42.

[0041] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of the protection of the present invention.

Claims

1. A jet crushing and classifying machine, comprising a feeding unit, a crushing unit and a jet classifying unit arranged in sequence along the material conveying direction, wherein the jet classifying unit comprises a jet tube and a classifier, wherein the classifier comprises a classifying cavity and three material classifying channels connected to the classifying cavity, wherein a classifying knife is arranged between any two adjacent classifying channels, and an adjusting mechanism for adjusting the deflection angle of the classifying knife is also arranged on the classifying cavity, wherein: Also included is a passive compensation mechanism; The passive compensation mechanism includes first compensation plates arranged on both sides of the blade of each grading knife, each first compensation plate is slidably connected to the side wall of the grading channel at the corresponding position; the first compensation plate changes position based on the deflection force of the corresponding grading knife.

2. The jet crushing and classifying machine according to claim 1, characterized in that: The grading knife comprises a semicircular segment and a triangular segment. A deflection shaft is arranged at the center of the semicircular segment and is rotatably connected to the grading cavity. The width dimension of one end of the triangular segment away from the blade is greater than the radial dimension of the semicircular segment.

3. The jet crushing classifier according to claim 2, characterized in that: The first compensation plate includes a main section and a secondary section. The main section is slidably arranged on the side wall of the grading channel. The main section is elastic and has a tendency to drive the secondary section to stick to the side wall of the grading channel based on its own elastic force.

4. The jet crushing and classifying machine according to claim 3, characterized in that: The end of the main section away from the auxiliary section is in an arc shape, and the inner arc surface faces the grading channel at the corresponding position.

5. The jet crushing and classifying machine according to claim 3, characterized in that: The end of the secondary segment away from the main segment is provided with an arc-shaped connecting block, and the connecting block is slidably connected with the semicircular segment; During the deflection stroke of the grading knife in the direction away from any first compensation plate, the secondary section of the first compensation plate rolls against the arc surface of the semicircular section.

6. The jet crushing and classifying machine according to claim 5, characterized in that: An arc rod is provided at the end of each connecting block connected to the semicircular segment. The arc rod is arranged to slide along its own arc track on the semicircular segment, and the center of the arc rod is at the junction of the auxiliary segment and the triangular segment. During the deflection stroke of the grading knife toward any first compensation plate, the secondary segment of the first compensation plate is deflected relative to the semicircular segment along the center of the arc rod.

7. The jet crushing and classifying machine according to claim 2, characterized in that: The regulating mechanism comprises a worm wheel fixedly connected to a deflection shaft arranged on each semicircular segment and two worms rotatably arranged on the grading cavity. The two worm wheels correspond to the two worms one by one, and the worm wheels are meshed with the worms relative to each other.

8. The jet crushing and classifying machine according to claim 7, characterized in that: There is a gap between the teeth of the worm wheel and the teeth of the meshing worm, and the size of the gap is within the size range of the particle size of the material passing through the corresponding classification channel.

9. The jet crushing and classifying machine according to claim 7, characterized in that: After the deflection angle of any grading knife is adjusted, the worm corresponding to the grading knife is fixed on the grading chamber by bolts.

10. The jet crushing and classifying machine according to claim 8, characterized in that: The blade part of the triangular segment comprises a fixed part and a swinging part, the swinging part is swingably arranged on the fixed part, and an elastic member is arranged at the swinging position of the two parts.

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