Adjustable mesh tea processing grading screen and processing technology

Abstract

The application discloses a tea processing grading screen with adjustable mesh and a processing technology, and belongs to the technical field of tea processing, which comprises a rack, a supporting plate arranged on the top of the rack, springs evenly arranged between the top of the rack and the bottom of the supporting plate, and a vibrating motor arranged on the bottom of the supporting plate. The application is characterized in that a rotating roller is rotatably arranged at both ends of a screening box, and an integrated metal belt is sleeved outside the rotating roller. Large mesh holes and small mesh holes with different diameters are respectively arranged on the upper surface and the lower surface of the metal belt, thereby forming a double-screen surface switching structure. When in use, the metal belt can be turned over by driving the rotating roller to rotate, the mesh hole type suitable for different specifications of tea leaves can be quickly switched, the complicated operation of disassembling and replacing the traditional screen mesh is completely abandoned, the mesh adjustment rate is greatly improved, the labor intensity is reduced, the wear of the screen mesh and the connecting structure of the equipment caused by frequent disassembly and assembly is avoided, and the overall service life of the equipment and the screening stability are prolonged.

Description

Technical Field

[0001] This invention relates to a grading and screening machine, and more particularly to a tea processing grading and screening machine with adjustable sieve aperture. This invention also relates to a processing technology, and more particularly to a tea processing grading and screening technology with adjustable sieve aperture, belonging to the field of tea processing technology. Background Technology

[0002] In tea processing, grading and sorting are crucial steps for improving the quality of finished tea and achieving commercialized grading and pricing. This process involves precisely sieving the tea leaves based on their shape, size, and particle size, classifying them into different grades to provide a foundation for subsequent processing, packaging, and sales. Currently, grading and sorting in tea processing is mostly accomplished using vibrating screens. These machines rely on a vibration source to drive the screening box in a reciprocating motion, causing the tea leaves to move relative to the screen mesh. Grading is achieved by utilizing the differences in the mesh openings. Due to its ease of operation and relatively high screening efficiency, it has become the mainstream screening equipment for tea processing enterprises.

[0003] However, the existing vibrating screens have a fixed structure, and the mesh size is fixed after leaving the factory. When different specifications of tea need to be graded and screened, the staff needs to disassemble and replace the original screens with screens of the corresponding mesh size. Disassembly and assembly is not only time-consuming and labor-intensive, but also significantly reduces the overall efficiency of tea grading. Furthermore, since different specifications of tea have different particle sizes and bulk densities, their sliding and screening characteristics on the screen are also different. The tilt angle of the screening box of the existing vibrating screen is fixed and cannot be adjusted according to the specifications of the tea raw materials to be screened. This can easily lead to problems such as tea accumulating and clogging on the screen or screening too quickly, resulting in a decrease in grading accuracy. In addition, the raw material feeding rate of the existing equipment cannot be adjusted according to the tilt angle of the screening box and the feeding rate of the raw materials, ultimately affecting the overall screening effect and grading quality of the tea.

[0004] To address these issues, a tea processing grading and screening machine with adjustable sieve apertures and a processing technology were designed. Summary of the Invention

[0005] The main objective of this invention is to provide a tea processing grading and screening machine and processing technology with adjustable sieve apertures. This is achieved by rotating rollers installed at both ends inside the screening box, with an integrated metal belt fitted around the outside of the rollers. The upper and lower surfaces of the metal belt are pre-set with large and small sieve apertures of different diameters, forming a dual-screen switching structure. During use, simply driving the rollers to rotate causes the metal belt to flip, quickly switching between sieve aperture types suitable for different tea sizes. This completely eliminates the cumbersome operation of traditional sieve disassembly and replacement, significantly improving the sieve aperture adjustment speed, reducing manual labor intensity, and avoiding wear on the sieve and equipment connection structure caused by frequent disassembly and assembly, thus extending the overall service life and screening stability of the equipment. The screening box is rotatably mounted on the top of a support plate, and a support and adjustment assembly consisting of a fixed plate, screw, slider, support rod, and guide groove, combined with a transmission lifting mechanism consisting of a worm gear, worm, second driven pulley, second driving pulley, and second toothed belt, achieves linkage control between sieve aperture adjustment and the tilt angle of the screening box. When switching to a small sieve aperture, the lifting mechanism simultaneously drives one end of the screening box to rise, increasing... The large tilt angle, combined with the high-frequency vibration of the vibrating motor, effectively enhances the flowability of tea materials, reducing the problem of clogging in small sieve holes at the source. When switching to a large sieve hole, the tilt angle decreases simultaneously, extending the residence time of tea leaves on the sieve screen, ensuring full separation of tea leaves of different particle sizes, significantly improving grading and screening accuracy, and adapting to the screening characteristics of different specifications of tea leaves. By setting a feeding hopper at one end of the top of the screening box, and rotating an adjusting plate on one side of the feeding hopper, and cooperating with a synchronous rotation mechanism consisting of a crossbar, reducer, first driven pulley, first driving pulley, and first toothed belt, the linkage between sieve hole size and feeding rate is achieved. When using a small sieve hole to screen fine tea particles, the rotating mechanism drives the adjusting plate to rotate, reducing the opening of the feeding port at the bottom of the feeding hopper, ensuring that the tea leaves are evenly spread on the sieve screen and avoiding local accumulation that affects the screening effect. When using a large sieve hole to screen coarse tea particles, the adjusting plate rotates synchronously to expand the feeding port, increasing the feeding speed, adapting to the high-efficiency screening capacity of the large sieve hole, and improving the overall processing capacity of the equipment while ensuring grading quality, achieving dual optimization of screening efficiency and effect.

[0006] The objective of this invention can be achieved by adopting the following technical solution:

[0007] A tea processing grading and screening machine with adjustable sieve holes includes a frame, a tray is provided on the top of the frame, springs are evenly arranged between the top of the frame and the bottom of the tray, and a vibration motor is installed on the bottom of the tray.

[0008] A screening box is rotatably mounted on one end of the top of the pallet via a rotating shaft. Rotating rollers are rotatably mounted on both ends inside the screening box. A metal belt is fitted between the two sets of rotating rollers. Large screen holes are opened on the upper surface of the metal belt, and small screen holes are opened on the lower surface of the metal belt.

[0009] A coarse material inlet is provided at one end of the bottom of the screening box, and a guide plate is provided between the two sides of the screening box and between the upper and lower surfaces of the metal belt. A fine material inlet is provided at the side of the screening box near the coarse material inlet.

[0010] A drive shaft is rotatably mounted at the end of the screening box away from the coarse material inlet. One end of the drive shaft is fixedly connected to the end of the rotating roller, and the other end of the drive shaft extends to the outside of the screening box and is fixedly mounted with a handwheel.

[0011] A feeding hopper is provided at the top of the screening box away from the coarse material inlet. An adjusting plate is rotatably installed on one side of the feeding hopper. A rotating mechanism is provided on the feeding hopper to drive the adjusting plate to rotate, which is used to adjust the opening of the feeding port formed between the feeding hopper and the adjusting plate. The rotating mechanism is connected to the transmission shaft.

[0012] A lifting mechanism is provided between the bottom end of the screening box away from the coarse material outlet and the top of the pallet, which is used to adjust the tilt angle of the screening box. The lifting mechanism is connected to the drive shaft.

[0013] Preferred configuration: The metal strip is interference-fitted with the rotating roller, the surface of the rotating roller is uniformly provided with anti-slip texture, the large sieve holes and the small sieve holes are distributed in an array, and the diameter of the large sieve holes is 1.5-3 times that of the small sieve holes.

[0014] Preferably, the lifting mechanism includes a fixed plate, a screw, a slider, a support rod, a guide groove, and a transmission unit. The fixed plate is fixed to the top of the support plate, the screw is rotatably mounted on the fixed plate, the slider is threaded onto the outside of the screw, the bottom of the screening box is provided with a guide groove that cooperates with the slider, the top of the support rod is hinged to the slider, the bottom of the support rod is hinged to the top of the support plate, and the end of the screw is provided with a transmission unit.

[0015] Preferably, the transmission unit includes a worm wheel, a worm, a second driven pulley, a second driving pulley, and a second toothed belt. The worm wheel is fixedly sleeved on the end of the screw, the worm is rotatably installed on the end of the screening box, and the worm meshes with the worm wheel. The second driven pulley is fixedly sleeved on the end of the worm, the second driving pulley is fixedly sleeved on the outside of the transmission shaft, and a second toothed belt is meshed between the second driving pulley and the second driven pulley.

[0016] Preferably, the rotating mechanism includes a crossbar, a reducer, a first driven pulley, a first driving pulley, and a first toothed belt. The crossbar is rotatably installed between the two ends of the hopper, and the bottom of the crossbar is fixedly connected to the adjusting plate. The reducer is installed at one end of the hopper, and the output end of the reducer is connected to the crossbar. The first driven pulley is fixedly sleeved on the input end of the reducer, and the first driving pulley is fixedly sleeved on the outside of the transmission shaft. A first toothed belt is meshed between the first driving pulley and the first driven pulley.

[0017] Preferably, a protective shell is fitted on the outside of the drive shaft, the protective shell is fixedly connected to the screening box, a locking bolt is threaded on the handwheel, and a positioning hole that mates with the locking bolt is opened on the outside of the protective shell.

[0018] Preferably, the guide plate is tilted and fixed inside the screening box, and the tilting direction of the guide plate is consistent with the conveying direction of the metal belt, and the sliding position on the guide plate corresponds to the fine material inlet.

[0019] Preferably, the length of the adjusting plate is the same as the length of the discharge end of the hopper, the inner side of the adjusting plate is in contact with the inner wall of the hopper, and the material of the adjusting plate is stainless steel.

[0020] Preferably, the vibration motor is a dual-axis vibration motor, and the vibration motor is fixed at an angle to the middle position of the support plate by bolts.

[0021] This invention also provides a tea processing grading and screening process with adjustable sieve apertures, comprising the following steps:

[0022] Step 1: According to the specifications of the tea leaves to be screened, rotate the handwheel to drive the drive shaft to rotate. The drive shaft drives the roller to rotate, causing the metal belt to flip and switch the large or small sieve holes of the corresponding aperture to the screening working surface.

[0023] Step 2: The transmission shaft synchronously drives the lifting mechanism to run. Through the meshing transmission of the worm gear and worm, the screw is driven to rotate. The slider moves along the screw and pushes the support rod to adjust the tilt angle of the screening box. When switching to the small screen hole, the tilt angle is increased, and when switching to the large screen hole, the tilt angle is decreased.

[0024] Step 3: The drive shaft simultaneously drives the rotating mechanism to operate, and the first toothed belt drives the reducer to work. The crossbar drives the adjusting plate to rotate, adjusting the size of the feeding port at the bottom of the hopper. When switching to the small screen hole, the feeding port is reduced, and when switching to the large screen hole, the feeding port is enlarged.

[0025] Step 4: Tighten the locking bolts to insert them into the positioning holes, fix the position of the drive shaft, and complete the linkage adjustment of the screen hole, inclination angle and feeding rate;

[0026] Step 5: Start the vibrating motor, pour the tea leaves to be screened into the feeding hopper, and the tea leaves fall evenly onto the screening working surface of the metal belt through the feeding port. The vibrating motor drives the screening box to vibrate, so that the tea leaves are vibrated and screened on the metal belt.

[0027] Step 6: Tea leaves that meet the aperture requirements fall through the sieve holes onto the guide plate and are guided by the guide plate to be discharged from the fine material outlet. Tea leaves that do not meet the aperture requirements are conveyed along the metal belt to the coarse material outlet and discharged, thus completing the grading and screening of the tea leaves.

[0028] The beneficial effects of this invention are as follows:

[0029] This invention provides a tea processing grading and screening machine and processing technology with adjustable screen holes. By rotating and installing rollers at both ends inside the screening box, and fitting an integrated metal belt on the outside of the rollers, the upper and lower surfaces of the metal belt are respectively preset with large and small screen holes of different diameters, forming a dual screen switching structure. In use, only the rotation of the rollers is needed to drive the metal belt to flip, quickly switching the screen hole type to suit different specifications of tea. This completely eliminates the cumbersome operation of disassembling and replacing traditional screens, which not only greatly improves the screen hole adjustment rate and reduces manual labor intensity, but also avoids wear and tear on the screen and equipment connection structure caused by frequent disassembly and assembly, thus extending the overall service life of the equipment and screening stability.

[0030] The screening box is rotatably mounted on the top of the pallet. A support and adjustment assembly consisting of a fixed plate, screw, slider, support rod, and guide groove, along with a transmission lifting mechanism composed of a worm gear, worm, second driven pulley, second driving pulley, and second toothed belt, enables the linkage control of the screen hole adjustment and the screen box tilt angle. When switching to a small screen hole, the lifting mechanism synchronously drives one end of the screening box to rise, increasing the tilt angle. Combined with the high-frequency vibration of the vibrating motor, this effectively enhances the flowability of the tea material and reduces the problem of small screen hole clogging at the source. When switching to a large screen hole, the tilt angle decreases synchronously, extending the residence time of the tea on the screen and ensuring that tea of ​​different particle sizes is fully separated, significantly improving the grading and screening accuracy and adapting to the screening characteristics of different specifications of tea.

[0031] By setting a feeding hopper at one end of the top of the screening box, and rotating an adjusting plate on one side of the feeding hopper, and cooperating with a synchronous rotation mechanism consisting of a crossbar, a reducer, a first driven pulley, a first driving pulley, and a first toothed belt, the screen aperture size and feeding rate are linked and adapted. When using a small screen aperture to screen fine tea particles, the rotation mechanism drives the adjusting plate to rotate, reducing the opening of the feeding port at the bottom of the feeding hopper, ensuring that the tea is evenly spread on the screen and avoiding local accumulation that affects the screening effect. When using a large screen aperture to screen coarse tea particles, the adjusting plate rotates synchronously to expand the feeding port, increase the feeding speed, and adapt to the high-efficiency screening capacity of the large screen aperture. While ensuring the grading quality, the overall processing capacity of the equipment is increased, achieving dual optimization of screening efficiency and effect. Attached Figure Description

[0032] Figure 1 This is the front view of the present invention;

[0033] Figure 2 This is a cross-sectional view of the internal structure of the screening box of the present invention;

[0034] Figure 3 This is a surface view of the metal strip of the present invention;

[0035] Figure 4 This is a partial structural diagram of the top of the frame of the present invention;

[0036] Figure 5This is a diagram of the material guide plate of the present invention;

[0037] Figure 6 This is a bottom view of the screening box of the present invention;

[0038] Figure 7 This is a diagram of the transmission structure of the present invention;

[0039] Figure 8 This is a partial structural diagram of the end of the screening box of the present invention;

[0040] Figure 9 This is an external view of the protective casing of the present invention.

[0041] In the diagram: 1. Frame; 2. Support plate; 3. Spring; 4. Vibrating motor; 5. Screening box; 6. Rotary roller; 7. Metal belt; 8. Large sieve hole; 9. Small sieve hole; 10. Coarse material inlet; 11. Guide plate; 12. Fine material inlet; 13. Drive shaft; 14. Handwheel; 15. Feed hopper; 16. Adjusting plate;

[0042] 17. Rotating mechanism; 1701. Crossbar; 1702. Reducer; 1703. First driven pulley; 1704. First driving pulley; 1705. First toothed belt;

[0043] 18. Lifting mechanism; 1801. Fixed plate; 1802. Screw; 1803. Slider; 1804. Support rod; 1805. Guide groove; 1806. Worm gear; 1807. Worm; 1808. Second driven pulley; 1809. Second driving pulley; 1810. Second toothed belt;

[0044] 19. Protective casing; 20. Locking bolt; 21. Positioning hole. Detailed Implementation

[0045] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0046] like Figures 1-9 As shown, this embodiment provides a tea processing grading and screening machine with adjustable sieve holes, including a frame 1, a support plate 2 is provided on the top of the frame 1, springs 3 are evenly arranged between the top of the frame 1 and the bottom of the support plate 2, and a vibration motor 4 is installed on the bottom of the support plate 2.

[0047] A screening box 5 is rotatably mounted on one end of the top of the pallet 2 via a rotating shaft. Rotating rollers 6 are rotatably mounted on both ends inside the screening box 5. A metal belt 7 is fitted between the two sets of rotating rollers 6. Large screen holes 8 are opened on the upper surface of the metal belt 7, and small screen holes 9 are opened on the lower surface of the metal belt 7.

[0048] A coarse material inlet 10 is provided at one end of the bottom of the screening box 5. A guide plate 11 is provided between the two sides of the screening box 5 and between the upper and lower surfaces of the metal strip 7. A fine material inlet 12 is provided at the side of the screening box 5 near the coarse material inlet 10.

[0049] A drive shaft 13 is rotatably mounted on one end of the screening box 5 away from the coarse material inlet 10. One end of the drive shaft 13 is fixedly connected to the end of the rotating roller 6, and the other end of the drive shaft 13 extends to the outside of the screening box 5 and is fixedly mounted with a handwheel 14.

[0050] The top of the screening box 5 is provided with a feeding hopper 15 at the end away from the coarse material outlet 10. An adjusting plate 16 is rotatably installed on one side of the feeding hopper 15. A rotating mechanism 17 is provided on the feeding hopper 15 to drive the adjusting plate 16 to rotate, which is used to adjust the opening of the feeding port formed between the feeding hopper 15 and the adjusting plate 16. The rotating mechanism 17 is connected to the transmission shaft 13.

[0051] A lifting mechanism 18 is provided between the bottom end of the screening box 5 away from the coarse material outlet 10 and the top of the support plate 2, which is used to adjust the tilt angle of the screening box 5. The lifting mechanism 18 is connected to the drive shaft 13.

[0052] In use, turning the handwheel 14 synchronously drives the transmission shaft 13 to drive the rotating roller 6, the transmission unit of the lifting mechanism 18, and the transmission components of the rotating mechanism 17. The rotating roller 6 drives the metal belt 7 to rotate, switching between large sieve hole 8 and small sieve hole 9 as the screening working surface. The lifting mechanism 18 adjusts the tilt angle of the screening box 5 to adapt to the screening requirements of different sieve holes. The rotating mechanism 17 drives the adjusting plate 16 to rotate, changing the size of the feeding port to match the screening efficiency of the sieve holes. After adjustment, the position of the transmission shaft 13 is fixed by the locking bolt 20. The vibration motor 4 is started, and the tea leaves fall from the hopper 15 to the working surface of the metal belt 7. Under the action of vibration, the tea leaves that meet the hole size requirements fall through the sieve holes to the guide plate 11 and are discharged through the fine material port 12. The unqualified tea leaves are transported along the metal belt 7 to the coarse material port 10 for discharge, realizing efficient grading and screening.

[0053] In this embodiment, the metal strip 7 is interference-fitted with the rotating roller 6, the surface of the rotating roller 6 is uniformly provided with anti-slip texture, the large sieve holes 8 and the small sieve holes 9 are both distributed in an array, and the diameter of the large sieve hole 8 is 1.5-3 times the diameter of the small sieve hole 9.

[0054] Both the large sieve holes 8 and the small sieve holes 9 are arranged in an array, and the diameter of the large sieve holes 8 is 1.5-3 times that of the small sieve holes 9, which can meet the grading requirements of different specifications of tea. When the drive shaft 13 drives the rotating roller 6 to rotate, the rotating roller 6 drives the metal belt 7 to move synchronously through friction, realizing the flipping and switching of the metal belt 7. The large sieve holes 8 or small sieve holes 9 can be quickly switched to the screening working surface without disassembly, which greatly improves the convenience and efficiency of sieve hole adjustment.

[0055] In this embodiment, the lifting mechanism 18 includes a fixed plate 1801, a screw 1802, a slider 1803, a support rod 1804, a guide groove 1805, and a transmission unit. The fixed plate 1801 is fixed to the top of the support plate 2. The screw 1802 is rotatably mounted on the fixed plate 1801. The slider 1803 is threaded onto the outside of the screw 1802. The bottom of the screening box 5 is provided with a guide groove 1805 that cooperates with the slider 1803. The top of the support rod 1804 is hinged to the slider 1803, and the bottom end of the support rod 1804 is hinged to the top of the support plate 2. The end of the screw 1802 is provided with a transmission unit.

[0056] When the screw 1802 rotates, the threaded drive drives the slider 1803 to move along the axial direction of the screw 1802. The slider 1803 pushes or pulls the support rod 1804. The support rod 1804 drives the screening box 5 to rotate around the rotating shaft at the top of the support plate 2 through the hinge point, thereby realizing the adjustment of the tilt angle of the screening box 5, so that the screening box 5 can adapt to the screening requirements of different screen holes and improve the grading accuracy.

[0057] In this embodiment, the transmission unit includes a worm gear 1806, a worm 1807, a second driven pulley 1808, a second driving pulley 1809, and a second toothed belt 1810. The worm gear 1806 is fixedly sleeved on the end of the screw 1802. The worm 1807 is rotatably mounted on the end of the screening box 5, and the worm 1807 meshes with the worm gear 1806. The second driven pulley 1808 is fixedly sleeved on the end of the worm 1807. The second driving pulley 1809 is fixedly sleeved on the outside of the transmission shaft 13. The second toothed belt 1810 is meshed between the second driving pulley 1809 and the second driven pulley 1808.

[0058] When the drive shaft 13 rotates, it drives the second drive pulley 1809 to rotate synchronously. The second drive pulley 1809 transmits power to the second driven pulley 1808 through the second toothed belt 1810. The second driven pulley 1808 drives the worm 1807 to rotate. The worm 1807 transmits power to the screw 1802 through meshing with the worm wheel 1806, driving the screw 1802 to rotate. This realizes the power linkage between the drive shaft 13 and the lifting mechanism 18, ensuring that the screen hole switching and tilt angle adjustment are carried out synchronously.

[0059] In this embodiment, the rotating mechanism 17 includes a crossbar 1701, a reducer 1702, a first driven pulley 1703, a first driving pulley 1704, and a first toothed belt 1705. The crossbar 1701 is rotatably installed between the two ends of the hopper 15, and the bottom of the crossbar 1701 is fixedly connected to the adjusting plate 16. The reducer 1702 is installed at one end of the hopper 15, and the output end of the reducer 1702 is connected to the crossbar 1701. The first driven pulley 1703 is fixedly sleeved on the input end of the reducer 1702. The first driving pulley 1704 is fixedly sleeved on the outside of the transmission shaft 13. The first toothed belt 1705 is meshed between the first driving pulley 1704 and the first driven pulley 1703.

[0060] When the drive shaft 13 rotates, the first drive pulley 1704 drives the first toothed belt 1705 to move. The first toothed belt 1705 drives the first driven pulley 1703 to rotate. The first driven pulley 1703 transmits power to the reducer 1702. After the reducer 1702 reduces the speed, it drives the crossbar 1701 to rotate. The crossbar 1701 drives the adjusting plate 16 to rotate around the axis of the crossbar 1701, thereby changing the opening of the feeding port formed between the adjusting plate 16 and the feeding hopper 15, so as to achieve precise matching between the feeding rate and the screen hole specifications.

[0061] In this embodiment, a protective shell 19 is fitted on the outside of the drive shaft 13. The protective shell 19 is fixedly connected to the screening box 5. A locking bolt 20 is threaded on the handwheel 14. A positioning hole 21 that mates with the locking bolt 20 is opened on the outside of the protective shell 19.

[0062] The locking bolt 20 threaded on the handwheel 14 is compatible with the positioning hole 21 on the outside of the protective shell 19. After the screen hole, tilt angle and feeding port are adjusted, tighten the locking bolt 20 so that the locking bolt 20 is inserted into the positioning hole 21. The position of the drive shaft 13 is fixed by mechanical clamping to prevent the drive shaft 13 from rotating accidentally during the operation of the equipment, which would cause the adjustment parameters to deviate and ensure the stability and reliability of the screening operation.

[0063] In this embodiment, the guide plate 11 is fixedly inclined inside the screening box 5, and the inclination direction of the guide plate 11 is consistent with the conveying direction of the metal belt 7. The sliding position on the guide plate 11 corresponds to the fine material inlet 12.

[0064] When the tea leaves fall through the sieve holes on the metal belt 7, they land on the surface of the guide plate 11. The inclined structure of the guide plate 11 provides guidance for the tea leaves, allowing them to slide along the surface of the guide plate 11 and be precisely guided to the fine material outlet 12 for discharge. This prevents the tea leaves from accumulating at the bottom of the screening box 5, ensuring smooth discharge of fine materials and improving the screening efficiency of the equipment.

[0065] In this embodiment, the length of the adjusting plate 16 is the same as the length of the discharge end of the hopper 15, the inner side of the adjusting plate 16 is in contact with the inner wall of the hopper 15, and the material of the adjusting plate 16 is stainless steel.

[0066] When the adjusting plate 16 rotates, its fit with the inner wall of the hopper 15 prevents tea leaves from leaking out of the gap, ensuring the sealing performance of the feeding port. The stainless steel material also increases the service life of the adjusting plate 16 and adapts to the working environment of tea processing.

[0067] In this embodiment, the vibration motor 4 is a dual-axis vibration motor, and the vibration motor 4 is fixed at an angle to the middle position of the support plate 2 by bolts.

[0068] After startup, the two eccentric blocks of the dual-axis vibrating motor rotate to generate excitation force. The excitation force is transmitted to the screening box 5 through the pallet 2, which drives the screening box 5 to perform high-frequency reciprocating vibration. Since the pallet 2 and the frame 1 are connected by the spring 3, the spring 3 plays a role in buffering and energy storage, which enhances the vibration effect of the screening box 5. During the vibration, the tea leaves on the metal belt 7 reciprocate under the vibration force, which accelerates the screening process of the tea leaves and prevents the tea leaves from clogging the screen holes, thereby improving the screening efficiency and grading accuracy.

[0069] like Figures 1-9 As shown in the figure, this embodiment provides a tea processing grading and screening process with adjustable sieve holes as follows:

[0070] Step 1: According to the specifications of the tea leaves to be screened, rotate the handwheel 14 to drive the drive shaft 13 to rotate. The drive shaft 13 drives the roller 6 to rotate, causing the metal belt 7 to flip and switch the large sieve hole 8 or small sieve hole 9 of the corresponding aperture to the screening working surface.

[0071] Step 2: The transmission shaft 13 synchronously drives the lifting mechanism 18 to run. Through the meshing transmission of the worm gear 1806 and the worm 1807, the screw 1802 is driven to rotate. The slider 1803 moves along the screw 1802 and pushes the support rod 1804 to adjust the tilt angle of the screening box 5. When switching to the small screen hole 9, the tilt angle is increased, and when switching to the large screen hole 8, the tilt angle is decreased.

[0072] Step 3: The drive shaft 13 simultaneously drives the rotating mechanism 17 to run, and drives the reducer 1702 to work through the first toothed belt 1705. The crossbar 1701 drives the adjusting plate 16 to rotate, adjusting the size of the feeding port at the bottom of the hopper 15. When switching to the small screen hole 9, the feeding port is reduced, and when switching to the large screen hole 8, the feeding port is enlarged.

[0073] Step 4: Tighten the locking bolt 20 to insert it into the positioning hole 21, fix the position of the drive shaft 13, and complete the linkage adjustment of the screen hole, inclination angle and feeding rate;

[0074] Step 5: Start the vibrating motor 4, pour the tea leaves to be screened into the feeding hopper 15, and the tea leaves fall evenly onto the screening working surface of the metal belt 7 through the feeding port. The vibrating motor 4 drives the screening box 5 to vibrate, so that the tea leaves are vibrated and screened on the metal belt 7.

[0075] Step 6: Tea leaves that meet the aperture requirements fall through the sieve holes onto the guide plate 11 and are guided by the guide plate 11 to be discharged from the fine material outlet 12. Tea leaves that do not meet the aperture requirements are conveyed along the metal belt 7 to the coarse material outlet 10 and discharged, thus completing the grading and screening of the tea leaves.

[0076] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A tea processing grading and screening machine with adjustable sieve aperture, comprising a frame (1), characterized in that: A tray (2) is provided on the top of the frame (1), and springs (3) are evenly provided between the top of the frame (1) and the bottom of the tray (2). A vibration motor (4) is installed on the bottom of the tray (2). A screening box (5) is rotatably installed at one end of the top of the tray (2) via a rotating shaft. Rotating rollers (6) are rotatably installed at both ends inside the screening box (5). A metal belt (7) is installed between the two sets of rotating rollers (6). Large screen holes (8) are opened on the upper surface of the metal belt (7), and small screen holes (9) are opened on the lower surface of the metal belt (7). A coarse material inlet (10) is provided at one end of the bottom of the screening box (5). A guide plate (11) is provided between the two sides of the screening box (5) and between the upper and lower surfaces of the metal strip (7). A fine material inlet (12) is provided at the side of the screening box (5) near the coarse material inlet (10). A drive shaft (13) is rotatably mounted on one end of the screening box (5) away from the coarse material inlet (10). One end of the drive shaft (13) is fixedly connected to the end of the rotating roller (6), and the other end of the drive shaft (13) extends to the outside of the screening box (5) and is fixedly mounted with a handwheel (14). The top of the screening box (5) is provided with a feeding hopper (15) at the end away from the coarse material port (10). An adjusting plate (16) is rotatably installed on one side of the feeding hopper (15). A rotating mechanism (17) is provided on the feeding hopper (15) to drive the adjusting plate (16) to rotate, which is used to adjust the opening of the feeding port formed between the feeding hopper (15) and the adjusting plate (16). The rotating mechanism (17) is connected to the transmission shaft (13). A lifting mechanism (18) is provided between the bottom end of the screening box (5) away from the coarse material inlet (10) and the top of the pallet (2) to adjust the tilt angle of the screening box (5). The lifting mechanism (18) is connected to the drive shaft (13).

2. The tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: The metal strip (7) is interference-fitted with the roller (6). The surface of the roller (6) is uniformly provided with anti-slip texture. The large sieve holes (8) and the small sieve holes (9) are arranged in an array. The diameter of the large sieve hole (8) is 1.5-3 times that of the small sieve hole (9).

3. The tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: The lifting mechanism (18) includes a fixed plate (1801), a screw (1802), a slider (1803), a support rod (1804), a guide groove (1805), and a transmission unit. The fixed plate (1801) is fixed to the top of the support plate (2). The screw (1802) is rotatably mounted on the fixed plate (1801). The slider (1803) is threaded onto the outside of the screw (1802). The bottom of the screening box (5) is provided with a guide groove (1805) that cooperates with the slider (1803). The top of the support rod (1804) is hinged to the slider (1803), and the bottom end of the support rod (1804) is hinged to the top of the support plate (2). The end of the screw (1802) is provided with a transmission unit.

4. The tea processing grading and screening machine with adjustable sieve aperture according to claim 3, characterized in that: The transmission unit includes a worm wheel (1806), a worm (1807), a second driven pulley (1808), a second driving pulley (1809), and a second toothed belt (1810). The worm wheel (1806) is fixedly sleeved on the end of the screw (1802). The worm (1807) is rotatably installed on the end of the screening box (5), and the worm (1807) meshes with the worm wheel (1806). The second driven pulley (1808) is fixedly sleeved on the end of the worm (1807). The second driving pulley (1809) is fixedly sleeved on the outside of the transmission shaft (13). The second toothed belt (1810) meshes between the second driving pulley (1809) and the second driven pulley (1808).

5. A tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: The rotating mechanism (17) includes a crossbar (1701), a reducer (1702), a first driven pulley (1703), a first driving pulley (1704), and a first toothed belt (1705). The crossbar (1701) is rotatably installed between the two ends of the hopper (15), and the bottom of the crossbar (1701) is fixedly connected to the adjusting plate (16). The reducer (1702) is installed at one end of the hopper (15), and the output end of the reducer (1702) is connected to the crossbar (1701). The first driven pulley (1703) is fixedly sleeved on the input end of the reducer (1702). The first driving pulley (1704) is fixedly sleeved on the outside of the transmission shaft (13). The first toothed belt (1705) is meshed between the first driving pulley (1704) and the first driven pulley (1703).

6. The tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: A protective shell (19) is fitted on the outside of the drive shaft (13). The protective shell (19) is fixedly connected to the screening box (5). A locking bolt (20) is threaded on the handwheel (14). A positioning hole (21) that mates with the locking bolt (20) is opened on the outside of the protective shell (19).

7. A tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: The guide plate (11) is fixed at an angle inside the screening box (5), and the angle of the guide plate (11) is consistent with the conveying direction of the metal belt (7). The sliding position on the guide plate (11) corresponds to the fine material inlet (12).

8. A tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: The length of the adjusting plate (16) is the same as the length of the discharge end of the hopper (15), the inner side of the adjusting plate (16) is in contact with the inner wall of the hopper (15), and the material of the adjusting plate (16) is stainless steel.

9. A tea processing grading and screening machine with adjustable sieve aperture according to claim 1, characterized in that: The vibration motor (4) is a dual-axis vibration motor, and the vibration motor (4) is fixed at the middle position of the support plate (2) by bolts.

10. A tea processing grading and screening process with adjustable sieve aperture, based on a tea processing grading and screening machine with adjustable sieve aperture according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: According to the specifications of the tea leaves to be screened, rotate the handwheel (14) to drive the drive shaft (13) to rotate. The drive shaft (13) drives the roller (6) to rotate, causing the metal belt (7) to flip and switch the large sieve hole (8) or small sieve hole (9) of the corresponding aperture to the screening working surface. Step 2: The transmission shaft (13) synchronously drives the lifting mechanism (18) to run. Through the meshing transmission of the worm wheel (1806) and the worm (1807), the screw (1802) is driven to rotate. The slider (1803) moves along the screw (1802) and pushes the support rod (1804). The tilt angle of the screening box (5) is adjusted. When switching to the small screen hole (9), the tilt angle is increased. When switching to the large screen hole (8), the tilt angle is decreased. Step 3: The drive shaft (13) simultaneously drives the rotating mechanism (17) to run, and drives the reducer (1702) to work through the first toothed belt (1705). The crossbar (1701) drives the adjusting plate (16) to rotate, adjusting the size of the feeding port at the bottom of the hopper (15). When switching to the small sieve hole (9), the feeding port is reduced; when switching to the large sieve hole (8), the feeding port is enlarged. Step 4: Tighten the locking bolt (20) to insert it into the positioning hole (21) to fix the position of the drive shaft (13) and complete the linkage adjustment of the screen hole, inclination angle and feeding rate; Step 5: Start the vibrating motor (4), pour the tea leaves to be screened into the feeding hopper (15), and the tea leaves fall evenly onto the screening working surface of the metal belt (7) through the feeding port. The vibrating motor (4) drives the screening box (5) to vibrate, so that the tea leaves are vibrated and screened on the metal belt (7). Step 6: Tea leaves that meet the aperture requirements fall through the sieve holes to the guide plate (11) and are guided by the guide plate (11) to be discharged from the fine material outlet (12). Tea leaves that do not meet the aperture requirements are transported along the metal belt (7) to the coarse material outlet (10) and discharged, thus completing the grading and screening of tea leaves.

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