A double-deck gyratory screen

Abstract

This application relates to the technical field of screening equipment. Addressing the problem that traditional double-layer rotary grading screens easily carry light impurities such as bean skin dust when screening beans, a new double-layer rotary grading screen is proposed. Its features include: a double-layer rotary grading screen body and an air separation mechanism; the double-layer rotary grading screen body includes a discharge box connected to a fine material discharge pipe; the air separation mechanism includes an air separation box and an exhaust device, with an exhaust port at the top and a discharge port at the bottom of the air separation box; the exhaust port is connected to the exhaust device; an inlet is located at the bottom outer side of the air separation box; the fine material discharge pipe of the double-layer rotary grading screen body passes through the inlet, with a circumferential gap between the fine material discharge pipe and the inlet; an impact plate is supported inside the air separation box, opposite to the inlet, with a gap between the impact plate and the inlet. This application effectively separates beans from light impurities.

Description

Technical Field

[0001] This application relates to the technical field of screening equipment, and in particular to a double-layer rotary grading screen. Background Technology

[0002] In the grain and oil production process, double-layer rotary grading screens are mainly used to screen soybean raw materials after shelling treatment in order to remove impurities such as soybean shells and stalks from the soybean raw materials and screen out soybean kernels.

[0003] In related technologies, such as Figure 1 The double-layer rotary grading screen 1 includes a screen frame 11, upper and lower double screen boxes 12, an eccentric drive mechanism 13, and a discharge box 14. The two screen boxes 12 are suspended on the screen frame 11 by universal joint rods. The discharge box 14 is connected to the discharge end of the two screen boxes 12. The discharge box 14 is connected to a fine material discharge pipe 141 and a coarse material discharge pipe 142. The fine material discharge pipe 141 and the coarse material discharge pipe 142 are respectively connected to the screen chambers separated by screen mesh inside the screen box 12.

[0004] When screening soybean raw materials through the double-layer rotary grading screen 1, the eccentric drive mechanism 13 drives the two screen boxes 12 to swing back and forth. After the soybean raw materials to be screened are fed into the upper and lower screen boxes 12, the screen inside the screen box 12 separates the soybean shells, soybean stalks and other large impurities from the soybean kernels. The soybean shells, soybean stalks and other impurities are discharged through the coarse material discharge pipe 142 of the discharge box 14, and the soybean kernels are discharged through the fine material discharge pipe 141 of the discharge box 14.

[0005] Regarding the aforementioned technologies, soybean kernels typically carry light impurities such as soybean skins and dust. These impurities are difficult to remove using existing double-layer rotary grading screens and will be discharged along with the soybean kernels, affecting further processing of the soybean kernels. Therefore, there is room for improvement. Utility Model Content

[0006] To better remove light impurities carried in soybean kernels, this application provides a double-layer rotary grading sieve.

[0007] This application provides a double-layer rotary classifying screen, which adopts the following technical solution: A double-layer rotary grading screen, characterized in that it includes a double-layer rotary grading screen body and an air separation mechanism; The double-layer rotary grading screen body includes a discharge box, and the discharge box is connected to a fine material discharge pipe; The air separation mechanism includes an air separation box and an exhaust device. The top and bottom of the air separation box are respectively provided with an exhaust port and a discharge port. The exhaust port is connected to the exhaust device. The bottom outer side of the air separation box is provided with a feed port. The fine material discharge pipe of the double-layer rotary grading screen body passes through the feed port, and the fine material discharge pipe and the feed port are left with a circumferential gap. An impact plate is supported in the inner cavity of the air separation box. The impact plate is arranged opposite to the feed port, and the impact plate and the feed port are left with a gap.

[0008] By adopting the above technical solution, while the double-layer rotary grading screen is running, the exhaust equipment draws air into the inner cavity of the air separator through the exhaust pipe. This allows external air to enter the inner cavity of the air separator through the circumferential gap between the feed inlet and the fine material discharge pipe and be discharged through the exhaust port, thus creating an upward airflow inside the air separator. Subsequently, the soybean kernels after being screened by the double-layer rotary grading screen enter the air separator through the fine material discharge pipe. The upward airflow carries away the light impurities such as soybean skin dust carried by the soybean kernels. The remaining soybean kernels are discharged through the discharge port at the bottom of the air separator, achieving effective separation of soybean kernels from light impurities. The impact plate, through its collision with the soybean kernels, helps to further separate the kernels from the light impurities under inertia, thereby improving the removal effect of light impurities.

[0009] Preferably, the top of the impact plate is hinged to the air separator, and the air separator is provided with a driving member corresponding to the impact plate. The driving member is in transmission cooperation with the impact plate to drive the impact plate to swing.

[0010] By adopting the above technical solution, when processing soybean materials with different impurity contents, the impact plate can be driven by the driving component to swing around its top hinge point to adjust the gap distance between the bottom of the impact plate and the feed inlet, thereby adjusting the impact force between the subsequent soybean kernels and the impact plate.

[0011] Preferably, there is a gap between the bottom end of the impact plate and the discharge port at the bottom of the air classifier; an auxiliary air inlet is provided on the side of the air classifier away from the feed inlet.

[0012] By adopting the above technical solution, when the exhaust equipment is working, in addition to entering through the circumferential gap of the feed inlet, external air can also be drawn into the inner cavity of the air separator through the auxiliary air inlet, and flow upward through the gap between the bottom of the impact plate and the discharge port, so as to form an auxiliary upward airflow at the end of the path of the falling beans. The auxiliary upward airflow can be used to perform secondary air separation on the beans that are about to be discharged, which is conducive to further improving the separation effect of beans and light impurities.

[0013] Preferably, the air separator is equipped with a filter screen corresponding to the auxiliary air inlet, and the filter screen is arranged to cover the auxiliary air inlet.

[0014] By adopting the above technical solution, when external air is drawn into the air separator through the auxiliary air inlet, the incoming airflow can be filtered through the filter screen to restrict external flying insects, fibers, large dust particles and other debris from entering the air separator with the airflow, thus limiting external impurities from causing secondary pollution to the sorted beans.

[0015] Preferably, a suction baffle is vertically fixed at the top of the inner cavity of the air separator, and the suction baffle is located above the impact plate; a gap is left between the suction baffle and one side cavity wall of the air separator to form a suction channel, and the suction port is connected to the suction channel; a suction baffle is supported in the suction channel, and the suction baffle is connected to a suction shaft, both ends of the suction shaft are rotatably inserted through the wall of the air separator, and the suction shaft is dampedly engaged with the wall of the air separator.

[0016] By adopting the above technical solution, the angle of the exhaust baffle can be adjusted by rotating the exhaust shaft, thereby achieving stepless adjustment of the intensity of the rising airflow in the air classifier box, which is beneficial to improving the applicability of the air classifier mechanism.

[0017] Preferably, the air separator has an exhaust observation port on its outer side, the exhaust observation port is connected to the exhaust channel, and a transparent plate is installed at the exhaust observation port.

[0018] By adopting the above technical solution, operators can observe the internal condition of the exhaust channel through the exhaust observation port, which facilitates monitoring the airflow status and the discharge of light impurities within the exhaust channel.

[0019] Preferably, the exhaust port is connected to an exhaust pipe, and a flange is connected to the outer periphery of the top end of the exhaust pipe. The flange is used to connect the exhaust device.

[0020] By adopting the above technical solution, when connecting the exhaust equipment, the flange is used to achieve a stable connection between the exhaust equipment and the exhaust pipe, making the installation and disassembly of the air separator and the exhaust equipment more convenient.

[0021] Preferably, a baffle plate is provided at the top of the inner cavity of the fine material discharge pipe, and a baffle shaft is connected to the top of the baffle plate. Both ends of the baffle shaft are rotatably inserted through the wall of the fine material discharge pipe, and the baffle shaft is damped in conjunction with the wall of the fine material discharge pipe.

[0022] By adopting the above technical solution, the angle of the baffle plate can be adjusted by swinging the baffle plate, thereby realizing the adjustment of the discharge volume of fine material from the discharge pipe.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The ventilation equipment is used to draw air into the cavity of the air separator to form an upward airflow inside the air separator. This upward airflow is used to carry away the light impurities carried by the soybean kernels after they have been screened by the double-layer rotary grading screen and entered the air separator, thereby achieving effective separation of soybean kernels from light impurities.

[0024] 2. By installing an impact plate inside the air separator, the soybean kernels entering the air separator can collide with the impact plate, which helps to better separate the soybean skin remaining on the surface of the kernels from the kernels.

[0025] 3. The impact plate is driven to swing by the drive component to adjust the distance between the impact plate and the feed inlet, thereby adjusting the impact force between the soybean kernels and the impact plate. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the double-layer rotary grading screen body used in this application.

[0027] Figure 2 This is a structural schematic diagram used in this application to illustrate the body of the double-layer rotary grading screen and the air separation mechanism.

[0028] Figure 3 This application is used to illustrate the double-layer rotary grading screen body and the air separation mechanism.

[0029] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0030] Figure 5 yes Figure 3 Enlarged schematic diagram of section B.

[0031] Explanation of reference numerals in the attached figures: 1. Double-layer rotary grading screen; 11. Screen frame; 12. Screen box; 13. Eccentric drive mechanism; 14. Discharge box; 141. Fine material discharge pipe; 1411. Baffle plate; 1412. Baffle shaft; 142. Coarse material discharge pipe; 15. Feed box; 2. Air separator; 21. Exhaust port; 211. Exhaust pipe; 212. Flange; 20. Exhaust baffle; 201. Exhaust channel; 202. Exhaust baffle; 203. Exhaust shaft; 204. Exhaust observation port; 205. Transparent plate; 22. Discharge port; 23. Feed port; 24. Impact plate; 25. Rocker arm; 251. Support shaft; 26. Drive component; 261. Drive screw; 262. Drive pin; 263. Rotating handwheel; 27. Auxiliary air inlet; 271. Filter screen. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0033] This application discloses a double-layer rotary grading sieve, referring to... Figure 1 and Figure 2 It includes a double-layer rotary grading screen body and an air separation mechanism.

[0034] Reference Figure 1 and Figure 2 The double-layer rotary grading screen 1 body includes a screen frame 11, two screen boxes 12, an eccentric drive mechanism 13, a discharge box 14, and a feed box 15; the two screen boxes 12 layers are connected and fixed by a bracket and are distributed vertically. The supports of the two screen boxes 12 are suspended on the screen frame 11 by four universal joint rods, and both screen boxes 12 are set at an inclination. The eccentric drive mechanism 13 is driven by the two screen boxes 12 to drive the two screen boxes 12 to swing in coordination with the universal joint rods. The feed box 15 is connected to the inclined upper end of the two screen boxes 12 to transport the soybean raw material to be screened into the two screen boxes 12. The discharge box 14 is connected to the inclined lower end of the two screen boxes 12. The discharge box 14 is connected to the fine material discharge pipe 141 and the coarse material discharge pipe 142. The fine material discharge pipe 141 and the coarse material discharge pipe 142 are respectively connected to the screen chambers formed by the screen mesh inside the screen box 12. The fine material discharge pipe 141 and the coarse material discharge pipe 142 are respectively used to output soybean kernels and soybean shells.

[0035] Reference Figure 3 and Figure 4 Both the fine material discharge pipe 141 and the coarse material discharge pipe 142 are inclined downwards away from the discharge box 14 to facilitate the subsequent discharge of the corresponding materials. A baffle plate 1411 is supported at the top of the inner cavity of the fine material discharge pipe 141. A baffle shaft 1412 is connected to the top of the baffle plate 1411. The baffle shaft 1412 is axially horizontal, and its two ends rotatably pass through the wall of the fine material discharge pipe 141, with damping engagement between the baffle shaft 1412 and the fine material discharge pipe 141. The discharge rate of the fine material discharge pipe 141 can be adjusted by swinging the baffle plate 1411 to change its angle.

[0036] Reference Figure 2 and Figure 3 The air classification mechanism includes an air classification box 2 and an exhaust device (not shown in the figure); the air classification box 2 has an exhaust port 21 and a discharge port 22 at the top and bottom, respectively; the exhaust port 21 is vertically connected to an exhaust pipe 211, and the top end of the exhaust pipe 211 is connected to the exhaust device through a flange 212. The discharge port 22 at the bottom of the air classification box 2 is connected to the back-end processing equipment used in conjunction with the air classification mechanism.

[0037] In this embodiment, a cyclone dust collector (Sacrificial cyclone dust collector) is used as the exhaust device. In other embodiments, a conventional exhaust fan can also be used. The flange 212 at the exhaust pipe 211 facilitates a stable connection between the exhaust port 21 and the exhaust device, and also facilitates the subsequent disassembly and maintenance of the air separator 2 and the exhaust device.

[0038] Reference Figure 3 and Figure 4 The bottom of the outer side of the air separator 2 is provided with a feed inlet 23; the fine material discharge pipe 141 of the double-layer rotary grading screen 1 is inserted through the feed inlet 23 to connect the air separator 2 and the fine material discharge pipe 141; a circumferential gap is left between the fine material discharge pipe 141 and the feed inlet 23 so that when the exhaust equipment exhausts the inner cavity of the air separator 2, the external airflow enters the air separator 2 through the circumferential gap between the fine material discharge pipe 141 and the feed inlet 23, thereby forming an upward airflow in the air separator 2. The upward airflow is used to carry the light impurities such as soybean skin dust carried in the soybean kernels out of the air separator 2 through the exhaust port 21, thereby achieving effective separation of the soybean kernels and light impurities.

[0039] An impact plate 24 is installed inside the air separator 2. The impact plate 24 is positioned opposite to the feed inlet 23, and a gap is left between the impact plate 24 and the feed inlet 23. The soybean kernels that are subsequently discharged through the fine material discharge pipe 141 and fall into the air separator 2 can collide with the impact plate 24, which is beneficial for separating the kernels from the skins.

[0040] Reference Figure 3 and Figure 5 The top of the impact plate 24 is hinged to the air classifier 2. The air classifier 2 is provided with a driving component 26 corresponding to the impact plate 24. The driving component 26 is in transmission cooperation with the impact plate 24 to drive the impact plate 24 to swing. The driving component 26 is used to drive the impact plate 24 to swing in order to adjust the gap between the impact plate 24 and the feed inlet 23, thereby adjusting the impact force between the subsequent soybean kernels and the impact plate 24.

[0041] Specifically, a rocker arm 25 is connected to the top of the impact plate 24, and the top of the rocker arm 25 is rotatably connected to the top of the inner cavity of the air separator 2 via a support shaft 251. The support shaft 251 is axially horizontally arranged. The driving component 26 includes a driving screw 261, which is threaded through the side of the air separator 2 away from the body of the double-layer rotary grading screen 1. The driving screw 261 is arranged opposite to the rocker arm 25, and one end of the driving screw 261 extending into the air separator 2 is hinged to the rocker arm 25 via a driving pin 262. The axial direction of the driving pin 262 is parallel to the axial direction of the support shaft 251 of the rocker arm 25. Rotating the driving screw 261 can drive the impact plate 24 to swing. A rotating handwheel 263 is fixed to the end of the driving screw 261 extending out of the air separator 2 to facilitate the rotation of the driving screw 261. In other embodiments, the driving component 26 can use a geared motor or a rotary cylinder to directly drive the support shaft 251 of the rocker arm 25 to rotate, thereby driving the impact plate 24 to swing.

[0042] Reference Figure 2 and Figure 3A gap is left between the bottom end of the impact plate 24 and the bottom outlet 22 of the air separator 2; an auxiliary air inlet 27 is provided on the side of the air separator 2 away from the inlet 23. The auxiliary air inlet 27 extends to the bottom outer side of the air separator 2. When the exhaust equipment is working, in addition to entering through the circumferential gap of the inlet 23, external air can also be drawn into the inner cavity of the air separator 2 through the auxiliary air inlet 27, and flow upward through the gap between the bottom end of the impact plate 24 and the outlet 22, so as to form an auxiliary upward airflow at the end of the path of the falling beans. This auxiliary upward airflow can be used to perform secondary air separation on the beans about to be discharged, which is beneficial to further improve the separation effect of beans and light impurities. Multiple auxiliary air inlets 27 can be set to increase the amount of air entering.

[0043] A filter 271 is installed in the air separator 2 corresponding to the auxiliary air inlet 27, and the filter 271 covers the auxiliary air inlet 27. The filter 271 is fixed to the outside of the air separator 2 with bolts. The filter 271 filters the air entering the air separator 2 through the auxiliary air inlet 27, preventing external flying insects, fibers, large dust particles and other debris from entering the air separator 2 with the airflow, and limiting the secondary contamination of the sorted beans by external impurities.

[0044] Reference Figure 3 and Figure 5 Specifically, a draft baffle 20 is vertically fixed at the top of the inner cavity of the air separator 2. The draft baffle 20 is located above the impact plate 24, and a gap is left between the draft baffle 20 and one side wall of the air separator 2 to form a draft channel 201. The draft port 21 is connected to the draft channel 201. A draft baffle 202 is supported inside the draft channel 201, and a draft shaft 203 is connected to the draft baffle 202. Both ends of the draft shaft 203 are rotatably inserted through the wall of the air separator 2, and the draft shaft 203 is damped in contact with the wall of the air separator 2. In actual use, the angle of the draft baffle 202 can be adjusted by rotating the draft shaft 203, thereby achieving stepless adjustment of the intensity of the rising airflow inside the air separator 2, which is beneficial to improving the overall applicability of the air separator mechanism. In other embodiments, a geared motor or a rotary cylinder can be used to directly drive the draft shaft 203 to rotate.

[0045] An exhaust observation port 204 is provided on the outside of the air separator 2, which is connected to the exhaust channel 201. A transparent panel 205 is installed at the exhaust observation port 204. Operators can observe the interior of the exhaust channel 201 through the exhaust observation port 204 to monitor the airflow status and the discharge of light impurities within the exhaust channel 201. The transparent panel 205 can be made of transparent acrylic sheet or plexiglass.

[0046] The implementation principle of this application embodiment is as follows: an upward airflow is formed in the air separator 2 by the exhaust device. The upward airflow carries away the soybean kernels, soybean skins, dust and other light impurities that enter the inner cavity of the air separator 2 through the fine material discharge pipe 141 of the double-layer rotary grading screen 1. The remaining soybean kernels enter through the discharge port 22 at the bottom of the air separator 2, thereby realizing the separation of soybean kernels and soybean skins.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-layer rotary grading screen, characterized in that: Includes the double-layer rotary grading screen (1) body and the air separation mechanism; The double-layer rotary grading screen (1) includes a discharge box (14), and the discharge box (14) is connected to a fine material discharge pipe (141); The air separation mechanism includes an air separation box (2) and an exhaust device. The air separation box (2) has an exhaust port (21) at the top and a discharge port at the bottom. The exhaust port (21) is connected to the exhaust device. The air separation box (2) has an inlet (23) at the bottom of its outer side. The fine material discharge pipe (141) of the double-layer rotary grading screen (1) is inserted through the inlet (23), and there is a circumferential gap between the fine material discharge pipe (141) and the inlet (23). The air separation box (2) has an impact plate (24) in its inner cavity. The impact plate (24) is arranged opposite to the inlet (23), and there is a gap between the impact plate (24) and the inlet (23).

2. The double-layer rotary grading screen according to claim 1, characterized in that: The top of the impact plate (24) is hinged to the air separator (2). The air separator (2) is provided with a driving member (26) corresponding to the impact plate (24). The driving member (26) is in transmission cooperation with the impact plate (24) to drive the impact plate (24) to swing.

3. The double-layer rotary grading screen according to claim 1, characterized in that: The bottom of the impact plate (24) is spaced from the discharge port (22) at the bottom of the air separator (2); the air separator (2) has an auxiliary air inlet (27) on the side away from the feed inlet (23).

4. The double-layer rotary grading screen according to claim 3, characterized in that: The air separator (2) is equipped with a filter (271) corresponding to the auxiliary air inlet (27), and the filter (271) covers the auxiliary air inlet (27).

5. A double-layer rotary grading screen according to claim 1, characterized in that: A suction baffle (20) is vertically fixed at the top of the inner cavity of the air separator (2), and the suction baffle (20) is located above the impact plate (24); the suction baffle (20) and one side cavity wall of the air separator (2) are left with a gap to form a suction channel (201), and the suction port (21) is connected to the suction channel (201); a suction baffle (202) is supported in the suction channel (201), and the suction baffle (202) is connected to a suction shaft (203). Both ends of the suction shaft (203) are rotatably inserted through the box wall of the air separator (2), and the suction shaft (203) is dampedly engaged with the box wall of the air separator (2).

6. A double-layer rotary grading screen according to claim 5, characterized in that: The air separator (2) has an exhaust observation port (204) on its outer side. The exhaust observation port (204) is connected to the exhaust channel (201). A transparent plate (205) is installed at the exhaust observation port (204).

7. A double-layer rotary grading screen according to claim 1, characterized in that: The exhaust port (21) is connected to an exhaust pipe (211), and a flange (212) is connected to the outer periphery of the top end of the exhaust pipe (211). The flange (212) is used to connect the exhaust device.

8. A double-layer rotary grading screen according to claim 1, characterized in that: A baffle plate (1411) is provided at the top of the inner cavity of the fine material discharge pipe (141). A baffle shaft (1412) is connected to the top of the baffle plate (1411). Both ends of the baffle shaft (1412) are rotatably inserted through the pipe wall of the fine material discharge pipe (141), and the baffle shaft (1412) is damped in conjunction with the pipe wall of the fine material discharge pipe (141).

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