Gravel particle screening device

Abstract

The invention relates to the technical field of gravel, in particular to a gravel particle screening device which comprises a gravel screening machine shell. According to the invention, the crushed stone block crushing mechanism can apply impact on small crushed stone blocks which are adhered together due to water so as to scatter the small crushed stone blocks, and the crushed stone moving speed adjusting mechanism can adjust the rolling speed of the crushed stone; in this way, the situation that stones with small friction force roll to the outside due to the fact that the moving speed is too high and layered screening is not completed is avoided, and the screening quality of the equipment is improved through the technical scheme. The broken stone particle screening device solves the problems that when the broken stone particle screening device is used for screening too humid broken stones, small broken stone clusters which are adhered together due to water possibly cannot pass through screening holes, and when the broken stones with small friction force are screened, the broken stones possibly roll down from a screen too fast, so that the standing time on the screen is short, and the broken stone particles cannot pass through the screening holes. And finally, the screening effect is affected.

Description

Technical Field

[0001] The invention relates to the technical field of crushed stones, in particular to a crushed stone particle screening device. Background Art

[0002] Gravel refers to small pieces of broken rock with irregular size, shape and texture. It may be natural raw material or the result of destruction. Gravel is composed of one or several minerals and natural glass. It is a solid aggregate with a stable appearance. According to its different components, it is also divided into marble gravel, quartz gravel, feldspar gravel and mica gravel.

[0003] In order to meet different application scenarios, for example, the construction industry requires gravel of different particle sizes for concrete, road base paving, etc. Before using these gravel, the gravel needs to be graded according to particle size through a gravel stratification screen to remove impurities and gravel of unqualified particle size to ensure that the final product meets quality standards. The gravel stratification screen used to screen the gravel in this process can be called a gravel particle screening device.

[0004] However, when using this type of gravel particle screening device to screen overly wet gravel, small gravel clumps stuck together due to moisture may not be able to pass through the sieve holes, resulting in incomplete screening, ultimately affecting the quality of the product. Different types of gravel have different frictional forces. When using this equipment to screen gravel with less friction, because the stone with less friction encounters less resistance when moving in the equipment, it may roll off the screen too quickly, resulting in a shorter residence time on the screen, and some fine particles mixed in the gravel may not be screened out, ultimately affecting the screening efficiency. Therefore, it does not meet the existing needs, and we have proposed a gravel particle screening device. Summary of the invention

[0005] The object of the present invention is to provide a crushed stone particle screening device to solve the problem raised in the above background technology that when using such a crushed stone particle screening device to screen overly wet crushed stone, small crushed stone clusters stuck together due to moisture may not be able to pass through the sieve holes, resulting in incomplete screening, ultimately affecting the quality of the product, and different types of crushed stone have different frictional forces. When using this device to screen crushed stone with less friction, because the stone with less friction encounters less resistance when moving in the equipment, it may roll off the screen too quickly, resulting in a shorter residence time on the screen, and some fine particles mixed in the crushed stone may not be screened out, ultimately affecting the screening efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a crushed stone particle screening device, comprising a crushed stone screening machine housing, a plurality of screening slots are arranged inside the crushed stone screening machine housing, stone screening plates are fixedly installed inside the remaining screening slots except the screening slot located at the bottom, a crushed stone moving speed adjustment mechanism is installed on the outer surface of the stone screening plate, the crushed stone moving speed adjustment mechanism comprises a plurality of metal bar receiving slots, inclined metal bars of the same number as the metal bar receiving slots, and a synchronous lifting mechanism, the plurality of metal bar receiving slots are sequentially arranged on the upper end surface of the stone screening plate from front to back, the plurality of inclined metal bars are respectively located inside the plurality of metal bar receiving slots, both sides of the outer surface of the inclined metal bars are inclined surfaces, and the synchronous lifting mechanism can synchronously drive all the inclined metal bars to move up and down;

[0007] A stone cluster crushing mechanism fixedly installed inside the shell of the stone crushing screening machine is provided above the first stone screening plate from top to bottom. The stone cluster crushing mechanism includes a circulating lifting plate, multiple stone cluster crushing rods, elastic connecting mechanisms with the same number as the stone cluster crushing rods, and a circulating up and down moving mechanism. The stone cluster crushing rods are installed on the lower end surface of the circulating lifting plate through the elastic connecting mechanism, and the circulating up and down moving mechanism can drive the circulating lifting plate to circulate up and down.

[0008] Preferably, the synchronous lifting mechanism comprises an adjusting motor, the output shaft of the adjusting motor is connected to a long rotating shaft via a coupling, and a metal tube is provided on the outer side of the long rotating shaft.

[0009] Preferably, a plurality of first bevel gears are fixedly sleeved on the outer surface of the long rotating shaft, the number of the first bevel gears is the same as the bevel metal bar and the positions correspond thereto, the first bevel gears are meshed with second bevel gears, the axis of the second bevel gears is connected to a transmission rotating shaft, the upper end face of the transmission rotating shaft is fixedly connected to a square rotating shaft, a threaded rod is provided on the outer side of the square rotating shaft, a square slot is provided in the middle position of the lower end face of the threaded rod, and the square rotating shaft is inserted into the inside of the square slot.

[0010] Preferably, the inner wall cross-section of the square slot is a square, the outer surface of the square shaft fits the inner wall of the square slot, and the square shaft is slidably connected to the square slot.

[0011] Preferably, an inner thread groove is provided on the outer side of the top end of the threaded rod, and the upper end surface of the threaded rod is connected to the inclined metal strip located above it through a roller bearing.

[0012] Preferably, a spring receiving groove is provided on both sides of the bevel metal strip, the spring receiving groove contains a second spring, the second spring is connected to a filling plate on the surface facing the nearest bevel metal strip, and the surface of the filling plate facing the inclined surface is in contact with the inclined surface.

[0013] Preferably, the cyclic up and down moving mechanism includes a stepper motor, the output shaft of the stepper motor is connected to a concave rotating shaft through a coupling, the middle position of the outer surface of the concave rotating shaft is a concave groove, and a metal sleeve is provided on the movable sleeve in the middle position of the concave groove on the concave rotating shaft, the lower end surface of the metal sleeve is connected to a push rod through a rotating shaft, and the lower end surface of the push rod is connected to the upper end surface of the cyclic lifting plate through a rotating shaft.

[0014] Preferably, a guide groove is provided on both sides of the push rod, a guide rod is provided inside the guide groove, and the lower end surface of the guide rod is fixed to the circulation lifting plate.

[0015] Preferably, the elastic connection mechanism comprises a cylindrical groove, a circular plate fitted with the inner wall of the cylindrical groove is provided on the lower side thereof, a metal rod is connected to the axis of the circular plate, the lower end surface of the metal rod is fixed to the stone mass crushing rod, a first spring is sleeved on the outer surface of the metal rod, and the lower end surface of the first spring is connected to the stone mass crushing rod;

[0016] The bottom end of the guide rod is in the shape of an arc surface.

[0017] Preferably, a plurality of discharge pipe openings are fixedly installed on the rear side of the lower end surface of the stone crushing and screening machine housing, the number of the discharge pipe openings is consistent with the number of screening slots, and the plurality of screening slots are respectively communicated with the interiors of the plurality of discharge pipe openings;

[0018] A feeding port is installed on one side of the upper end surface of the stone crushing and screening machine shell, and the feeding port is communicated with the interior of the screening slot located at the top.

[0019] The present invention provides a stone cluster crushing mechanism above the first stone screening plate from top to bottom, and can synchronously drive all stone cluster crushing rods to move up and down through a circulating up and down moving mechanism located inside the stone cluster crushing mechanism. When the downward moving stone cluster crushing rod hits small stone clusters stuck together due to moisture, the small stone clusters will be broken up due to the impact of the stone cluster crushing rod. Compared with a single impact with the stone screening plate, this multiple impact method can more easily separate the stuck stone clusters. The above technical solution can prevent the stuck small stone clusters from being unable to pass through the sieve holes on the stone screening plate, thereby improving the screening quality of the equipment.

[0020] The present invention can move the inclined metal bar up and down according to the friction of the screened gravel when the device is used to screen the gravel with smaller friction. The smaller the friction of the screened gravel, the further the inclined metal bar is moved upward. The higher the height of the inclined metal bar, the greater the obstruction to the gravel. The greater the obstruction to the gravel, the slower the rolling speed of the gravel. The above technical scheme can avoid the situation that the stone with smaller friction rolls to the outside without completing the stratified screening due to excessive moving speed. Moreover, this structure enables the device to flexibly adapt to a variety of different types of gravel, and can adjust the height of the inclined metal bar according to the characteristics of the gravel, so as to ensure that different types of gravel maintain similar moving speeds in the device, thereby improving the stratified screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 A front view of the present invention as a whole;

[0023] Figure 3 For the present invention Figure 2 A magnified view of the structure at center A;

[0024] Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle;

[0025] Figure 5 For the present invention Figure 2 A magnified view of the structure at C in the middle;

[0026] Figure 6 For the present invention Figure 5 Enlarged view of the structure at D in the middle.

[0027] In the figure: 1. stone crushing screening machine housing; 2. stone crushing mechanism; 201. stepping motor; 202. concave rotating shaft; 203. metal sleeve; 204. push rod; 205. circulation lifting plate; 206. cylindrical groove; 207. circular plate; 208. metal rod; 209. first spring; 210. stone crushing rod; 211. guide rod; 212. guide groove; 213. arc surface; 214. concave groove; 3. stone screen Partition plate; 4. Adjustment motor; 5. Spring storage groove; 6. Metal pipe; 7. Long shaft; 8. First bevel gear; 9. Second bevel gear; 10. Transmission shaft; 11. Square shaft; 12. Threaded rod; 13. Square slot; 14. Bevel metal strip; 15. Filling plate; 16. Second spring; 17. Metal strip storage groove; 18. Internal thread groove; 19. Screening groove; 20. Discharge pipe outlet; 21. Feeding port; 22. Inclined surface. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] See also Figures 1 to 6 The present invention provides a crushed stone particle screening device, comprising a crushed stone screening machine housing 1, wherein a plurality of screening slots 19 are arranged inside the crushed stone screening machine housing 1, and a stone screening plate 3 is fixedly installed inside the other screening slots 19 except the screening slot 19 located at the bottom, and a crushed stone moving speed adjustment mechanism is installed on the outer surface of the stone screening plate 3, and the crushed stone moving speed adjustment mechanism comprises a plurality of metal bar receiving slots 17, an inclined metal bar 14 having the same number as the metal bar receiving slots 17, and a synchronous lifting mechanism, wherein the plurality of metal bar receiving slots 17 are sequentially arranged on the upper end surface of the stone screening plate 3 from front to back, and the plurality of inclined metal bars 14 are respectively located inside the plurality of metal bar receiving slots 17, and both sides of the outer surface of the inclined metal bars 14 are inclined surfaces 22, and the synchronous lifting mechanism can synchronously drive all the inclined metal bars 14 to move up and down.

[0030] A plurality of discharge pipe openings 20 are fixedly mounted on the rear side of the lower end surface of the stone crushing and screening machine housing 1 . The number of the discharge pipe openings 20 is consistent with the number of the screening slots 19 , and the plurality of screening slots 19 are respectively connected to the interiors of the plurality of discharge pipe openings 20 .

[0031] A feeding port 21 is installed on one side of the upper end surface of the gravel screening machine housing 1, and the feeding port 21 is communicated with the interior of the screening slot 19 located at the top; when the equipment needs to be used, the gravel required for screening is added to the interior of the screening slot 19 through the feeding port 21.

[0032] The synchronous lifting mechanism includes an adjusting motor 4, the output shaft of which is connected to a long rotating shaft 7 through a coupling, and a metal tube 6 is provided on the outer side of the long rotating shaft 7; if the friction of the crushed stone to be screened is small and the rolling speed on the stone screening plate 3 is too fast, the adjusting motor 4 is started, and the long rotating shaft 7 connected thereto can be driven to rotate by the adjusting motor 4.

[0033] A plurality of first bevel gears 8 are fixedly sleeved on the outer surface of the long rotating shaft 7, the number of the first bevel gears 8 is the same as the bevel metal strip 14 and the position corresponds thereto, the first bevel gear 8 is meshed with a second bevel gear 9, the axis of the second bevel gear 9 is connected to a transmission rotating shaft 10, the upper end face of the transmission rotating shaft 10 is fixedly connected to a square rotating shaft 11, a threaded rod 12 is provided on the outer side of the square rotating shaft 11, a square slot 13 is provided in the middle position of the lower end face of the threaded rod 12, and the square rotating shaft 11 is inserted into the inside of the square slot 13; when the long rotating shaft 7 rotates, the first bevel gear 8 fixedly sleeved on the outer surface of the long rotating shaft 7 and the second bevel gear 9 meshed with the first bevel gear 8 will rotate together, and the rotating second bevel gear 9 can drive the transmission rotating shaft 10 connected to the axis of the second bevel gear 9 and the square rotating shaft 11 fixed between the transmission rotating shaft 10 to rotate together.

[0034] The inner wall cross-section of the square slot 13 is a square, the outer surface of the square shaft 11 fits with the inner wall of the square slot 13, and the square shaft 11 and the square slot 13 are slidingly connected; since the outer surface of the square shaft 11 fits with the inner wall of the square slot 13 located at the lower end face of the threaded rod 12, when the square shaft 11 rotates, the threaded rod 12 will rotate therewith.

[0035] An internal thread groove 18 is provided on the outer side of the top end of the threaded rod 12, and the upper end surface of the threaded rod 12 is connected to the inclined metal strip 14 located above it through a roller bearing; when the threaded rod 12 rotates, the threaded rod 12 will move up and down accordingly under the drive of the internal thread structure of the internal thread groove 18, and the threaded rod 12 is moved upward at this time. During the upward movement of the threaded rod 12, the inclined metal strip 14 connected to the threaded rod 12 through the roller bearing will move upward together with it. The higher the height of the inclined metal strip 14, the greater the hindrance to the rolling of the crushed stone, and the greater the hindrance to the rolling of the crushed stone, the slower the rolling speed of the crushed stone. The above technical solution can avoid the situation that stones with less friction force roll to the outside world before completing stratified screening due to excessive moving speed, and this structure enables the equipment to flexibly adapt to a variety of different types of crushed stones, and can adjust the height of the inclined metal strip according to the characteristics of the crushed stones, so as to ensure that different types of crushed stones maintain similar moving speeds in the equipment, thereby improving the effect of stratified screening.

[0036] The inclined surface 22 on the outer surface of the inclined metal strip 14 can prevent the inclined metal strip 14 from completely stopping the rolling of a portion of the gravel in contact with the inclined metal strip 14 .

[0037] The synchronous lifting mechanism mentioned above can synchronously adjust the height of all the inclined metal strips 14 on the stone screening plate 3 by a single adjustment motor 4. This synchronous lifting mechanism can reduce the production cost of the equipment, and when a power failure occurs in the synchronous lifting mechanism, the fault location can be quickly found.

[0038] A spring receiving groove 5 is provided on both sides of the inclined metal strip 14, and the interior of the spring receiving groove 5 contains a second spring 16. The surface of the second spring 16 facing the nearest inclined metal strip 14 is connected to a filling plate 15, and the surface of the filling plate 15 facing the inclined surface 22 is in contact with the inclined surface 22; when the inclined metal strip 14 moves upward, the filling plate 15 in contact with the inclined surface 22 on its outer surface will be pushed outward and squeeze the second spring 16, and the gap between the inclined surface 22 on the inclined metal strip 14 and the metal strip receiving groove 17 can be filled by the filling plate 15, so as to prevent some small pieces of gravel from entering its interior and thereby jamming the inclined metal strip 14 in the current position.

[0039] A stone cluster crushing mechanism 2 fixedly installed inside the outer shell of the stone crushing screening machine housing 1 is provided above the first stone screening plate 3 from top to bottom. The stone cluster crushing mechanism 2 includes a circulating lifting plate 205, a plurality of stone cluster crushing rods 210, elastic connection mechanisms having the same number as the stone cluster crushing rods 210, and a circulating up and down moving mechanism. The stone cluster crushing rods 210 are installed on the lower end surface of the circulating lifting plate 205 through the elastic connection mechanism, and the circulating up and down moving mechanism can drive the circulating lifting plate 205 to circulate up and down.

[0040] The cyclic up-and-down moving mechanism includes a stepper motor 201, the output shaft of the stepper motor 201 is connected to a concave rotating shaft 202 through a coupling, the middle position of the outer surface of the concave rotating shaft 202 is a concave groove 214, and a metal sleeve 203 is provided on the middle position of the concave groove 214 of the concave rotating shaft 202. The lower end surface of the metal sleeve 203 is connected to a push rod 204 through a rotating shaft, and the lower end surface of the push rod 204 is connected to the upper end surface of the cyclic lifting plate 205 through a rotating shaft; when the When the equipment is used to screen relatively wet gravel, the stepper motor 201 is started, and the stepper motor 201 can drive the concave rotating shaft 202 connected thereto to rotate. When the concave rotating shaft 202 rotates, the metal sleeve 203 sleeved on the concave groove 214 on the outer surface of the concave rotating shaft 202 will revolve around the output shaft of the stepper motor 201, and the revolving metal sleeve 203 can drive the circulating lifting plate 205 connected thereto through the push rod 204 to circulate up and down.

[0041] A guide groove 212 is provided on both sides of the push rod 204, and a guide rod 211 is provided inside the guide groove 212, and the lower end surface of the guide rod 211 is fixed to the circulation lifting plate 205; the two guide rods 211 fixed to the upper end surface of the circulation lifting plate 205 can ensure that the circulation lifting plate 205 moving up and down remains parallel. When the circulation lifting plate 205 moves downward, the stone group crushing rod 210 connected to the lower end surface of the circulation lifting plate 205 by the elastic connection mechanism will move downward together. When the downward moving stone group crushing rod 210 hits the small crushed stone group stuck together due to moisture, this small crushed stone group will be broken up due to the impact of the stone group crushing rod 210. Compared with a single impact with the stone screening plate 3, this multiple impact method makes it easier to separate the crushed stone groups stuck together. The above technical solution can prevent the small crushed stone groups stuck together from being unable to pass through the sieve holes on the stone screening plate 3, thereby improving the screening quality of the equipment.

[0042] Furthermore, the elastic connection mechanism includes a cylindrical groove 206, and a circular plate 207 that fits with its inner wall is provided on the lower side of the cylindrical groove 206. A metal rod 208 is connected to the axis of the circular plate 207. The lower end surface of the metal rod 208 is fixed to the stone mass crushing rod 210. The outer surface of the metal rod 208 is sleeved with a first spring 209, and the lower end surface of the first spring 209 is connected to the stone mass crushing rod 210; when the downward moving stone mass crushing rod 210 hits a complete large-scale gravel, the stone mass crushing rod 210 will move upward and squeeze the first spring 209. After that, when the circulating lifting plate 205 moves upward, the reaction force of the squeezed first spring 209 can push the stone mass crushing rod 210 back to its original position. The above technical solution can prevent the stone mass crushing rod 210 from hitting the complete large-scale gravel, thereby jamming the circulating up and down moving mechanism. The bottom end of the guide rod 211 is in the shape of an arc surface 213; the guide rod 211 of this shape can prevent the stone cluster crushing rod 210 from being damaged due to collision with the crushed stones.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A crushed stone particle screening device, characterized in that: The invention comprises a crushing and screening machine housing, wherein a plurality of screening slots are arranged inside the crushing and screening machine housing, and stone screening plates are fixedly installed inside the other screening slots except the screening slot located at the bottom, and a crushing speed adjustment mechanism is installed on the outer surface of the stone screening plate, and the crushing speed adjustment mechanism comprises a plurality of metal bar receiving slots, inclined metal bars of the same number as the metal bar receiving slots, and a synchronous lifting mechanism, wherein the plurality of metal bar receiving slots are sequentially arranged on the upper end surface of the stone screening plate from front to back, and the plurality of inclined metal bars are respectively located inside the plurality of metal bar receiving slots, and both sides of the outer surface of the inclined metal bars are inclined surfaces, and the synchronous lifting mechanism can synchronously drive all the inclined metal bars to move up and down; A stone cluster crushing mechanism fixedly installed inside the shell of the stone crushing screening machine is provided above the first stone screening plate from top to bottom. The stone cluster crushing mechanism includes a circulating lifting plate, multiple stone cluster crushing rods, elastic connecting mechanisms with the same number as the stone cluster crushing rods, and a circulating up and down moving mechanism. The stone cluster crushing rods are installed on the lower end surface of the circulating lifting plate through the elastic connecting mechanism, and the circulating up and down moving mechanism can drive the circulating lifting plate to circulate up and down.

2. A crushed stone particle screening device according to claim 1, characterized in that: The synchronous lifting mechanism comprises an adjusting motor, the output shaft of the adjusting motor is connected to a long rotating shaft through a coupling, and a metal pipe is arranged on the outer side of the long rotating shaft.

3. A crushed stone particle screening device according to claim 2, characterized in that: The outer surface of the long rotating shaft is fixedly sleeved with a plurality of first bevel gears, the number of the first bevel gears is the same as the bevel metal bar and the positions are corresponding thereto, the first bevel gears are meshed with second bevel gears, the axis of the second bevel gears is connected to a transmission rotating shaft, the upper end face of the transmission rotating shaft is fixedly connected to a square rotating shaft, a threaded rod is provided on the outer side of the square rotating shaft, a square slot is provided in the middle position of the lower end face of the threaded rod, and the square rotating shaft is inserted into the inside of the square slot.

4. A crushed stone particle screening device according to claim 3, characterized in that: The inner wall cross-section of the square slot is in a square shape, the outer surface of the square shaft fits the inner wall of the square slot, and the square shaft is slidably connected to the square slot.

5. The crushed stone particle screening device according to claim 3, characterized in that: An inner thread groove is arranged on the outer side of the top end of the threaded rod, and the upper end surface of the threaded rod is connected to the inclined metal strip located above it through a roller bearing.

6. A crushed stone particle screening device according to claim 5, characterized in that: A spring receiving groove is provided on both sides of the bevel metal strip, and a second spring is contained inside the spring receiving groove. The surface of the second spring facing the nearest bevel metal strip is connected to a filling plate, and the surface of the filling plate facing the inclined surface is in contact with the inclined surface.

7. The crushed stone particle screening device according to claim 1, characterized in that: The cyclic up and down moving mechanism includes a stepper motor, the output shaft of the stepper motor is connected to a concave rotating shaft through a coupling, the middle position of the outer surface of the concave rotating shaft is a concave groove, and a metal sleeve is provided on the movable sleeve at the middle position of the concave groove on the concave rotating shaft, the lower end surface of the metal sleeve is connected to a push rod through a rotating shaft, and the lower end surface of the push rod is connected to the upper end surface of the cyclic lifting plate through a rotating shaft.

8. The crushed stone particle screening device according to claim 7, characterized in that: A guide groove is arranged on both sides of the push rod, a guide rod is arranged inside the guide groove, and the lower end surface of the guide rod is fixed to the circulation lifting plate.

9. The crushed stone particle screening device according to claim 8, characterized in that: The elastic connection mechanism includes a cylindrical groove, a circular plate fitting with the inner wall of the cylindrical groove is provided on the lower side thereof, a metal rod is connected to the axis of the circular plate, the lower end surface of the metal rod is fixed to the stone mass crushing rod, a first spring is sleeved on the outer surface of the metal rod, and the lower end surface of the first spring is connected to the stone mass crushing rod; the bottom end of the guide rod is in the shape of an arc surface.

10. The crushed stone particle screening device according to claim 1, characterized in that: A plurality of discharge pipe openings are fixedly installed on the rear side of the lower end surface of the stone crushing and screening machine housing, the number of the discharge pipe openings is consistent with the number of screening slots, and the plurality of screening slots are respectively communicated with the interiors of the plurality of discharge pipe openings; A feeding port is installed on one side of the upper end surface of the stone crushing and screening machine shell, and the feeding port is communicated with the interior of the screening slot located at the top.

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