Automatic grading and screening device for jujube fruits

Abstract

The invention discloses a jujube fruit grading and automatic screening device which comprises a first support, a second support, a driving assembly, a material collecting mechanism and a material guiding assembly. A feeding roller mechanism is mounted on the first bracket; the second support is installed on one side of the first support, and a plurality of screening rollers arranged side by side are rotationally connected to the second support. The driving assembly is installed on the first support and used for driving the multiple screening rollers and the feeding roller mechanism to rotate. The material receiving mechanism is mounted on one side of the bottom of the second support, and a vibration filtering assembly is mounted in the material receiving mechanism; the material guiding assembly is installed on the second support and used for discharging jujube fruits in inner cavities of the multiple screening rollers into the material collecting mechanism. Screening holes are formed in the screening rollers, and the hole diameters of the screening holes in the multiple screening rollers are sequentially increased in the feeding direction of the feeding roller mechanism. According to the jujube fruit grading and screening device, jujube fruits of different sizes can be graded and screened step by step, impurities and dust in the jujube fruits can be filtered and removed, and the screening efficiency and the grading accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of screening machines, in particular to an automatic grading and screening device for jujube fruits. Background Art

[0002] In the processing and grading of jujube fruits, the traditional manual grading and screening methods are not only inefficient, but also difficult to ensure the consistency and accuracy of grading. With the development of agricultural modernization, the demand for automated and intelligent fruit grading and screening is growing. However, existing automatic screening equipment often has problems such as complex structure, high maintenance cost, and unsatisfactory grading effect, especially when dealing with jujube fruits with large differences in shape and size. These problems are particularly prominent.

[0003] The size and maturity of jujube fruits directly affect their quality and market value. Therefore, accurate and efficient grading and screening are of great significance for improving the commerciality and added value of jujube fruits. Traditional screening equipment usually relies on a single screen or sieve hole for grading. This method is difficult to achieve accurate grading for jujube fruits with small size differences and is prone to fruit damage. In addition, the replacement and cleaning of the screen also increases the maintenance cost and time cost of the equipment.

[0004] In the process of harvesting and processing jujube fruits, fruit grading is a crucial link. Grading can not only improve the commodity value of jujube fruits, but also meet the requirements of different markets for fruit specifications. Traditional jujube fruit grading is mainly done manually. Although this method guarantees the quality of grading to a certain extent, it has many defects.

[0005] First, manual grading is inefficient, especially during the peak harvest period, which requires a lot of manpower and increases labor costs. At the same time, manual grading is limited by factors such as human fatigue and subjective judgment, and it is difficult to unify the grading standards, resulting in uneven grading results, which affects the market competitiveness of jujubes.

[0006] Secondly, although the existing partially automated grading devices have improved the grading efficiency to a certain extent, their designs are often too simple and the grading method is single, which cannot meet the needs of fine grading of jujube fruits of different sizes. These devices usually use a single screen or sieve hole for screening, and the aperture of the sieve hole is fixed, which cannot achieve the gradual grading and screening of jujube fruits, resulting in inaccurate grading and unsatisfactory grading effect.

[0007] In addition, some existing grading devices easily cause damage to the jujube fruits during the screening process, especially when the jujube fruits pass through the screen. Due to the rigidity and friction of the screen, the surface of the fruit is often damaged, affecting the appearance quality and edible value of the jujube fruits.

[0008] Finally, the existing grading devices often lack an effective impurity and dust removal mechanism when collecting and processing the screened jujube fruits, resulting in a large amount of impurities and dust mixed in the collected jujube fruits, affecting the cleanliness and sanitary quality of the jujube fruits.

[0009] Therefore, an automatic screening device for grading jujube fruits is proposed. Summary of the invention

[0010] The object of the present invention is to provide an automatic screening device for grading jujube fruits, aiming to solve or improve at least one of the above-mentioned technical problems.

[0011] To achieve the above object, the present invention provides the following solution: The present invention provides an automatic grading and screening device for jujube fruits, comprising:

[0012] A first bracket, on which a feeding roller mechanism is installed;

[0013] A second bracket, the second bracket is installed on one side of the first bracket, and a plurality of screening rollers arranged side by side are rotatably connected to the second bracket;

[0014] A driving assembly, the driving assembly is mounted on the first bracket and is used to drive the plurality of screening rollers and the feeding roller mechanism to rotate;

[0015] A material receiving mechanism, the material receiving mechanism is installed on one side of the bottom of the second bracket, and a vibration filtering component is installed in the material receiving mechanism;

[0016] A material guide assembly, which is mounted on the second bracket and is used to discharge a number of jujube fruits in the inner cavity of the screening roller into the material receiving mechanism;

[0017] Wherein, the screening roller is provided with screen holes, and the apertures of the screen holes on the screening rollers increase sequentially along the feeding direction of the feeding roller mechanism.

[0018] According to the automatic grading and screening device for jujube fruits provided by the present invention, a dust box is installed on the first bracket, a dust bag is installed in the dust box, a fan is installed at one end of the dust box, a dust suction plate and a plurality of dust suction pipes are installed at the air inlet end of the fan, the dust suction plate is installed on the first bracket and is located below the feeding roller mechanism, and the plurality of dust suction pipes are connected to the receiving mechanism.

[0019] According to the automatic screening device for grading jujube fruits provided by the present invention, the feeding roller mechanism comprises:

[0020] A first rotating shaft, wherein two first rotating shafts are arranged side by side and both of the first rotating shafts are rotatably connected to the first bracket, a first sprocket and a second sprocket are respectively installed at both ends of the first rotating shaft, and one of the first rotating shafts is drivingly connected to the driving assembly;

[0021] A first chain, wherein two first chains are provided, and the two first chains are respectively sleeved on the two first sprockets and the two second sprockets;

[0022] The material transfer rollers are provided with a plurality of material transfer rollers, and the plurality of material transfer rollers are installed between two of the first chains at intervals; the dust collecting plate is located directly below the plurality of material transfer rollers.

[0023] According to the jujube fruit grading and automatic screening device provided by the present invention, the material receiving mechanism comprises a base mounted on one side of the bottom of the second bracket, a plurality of mounting seats are arranged above the base, the bottom of the mounting seat is mounted on the top surface of the base through a plurality of springs, a material receiving box is detachably connected to the mounting seat, and the vibration filtering assembly is mounted on the inner wall of the material receiving box;

[0024] A dust suction port is installed at the bottom of the side wall of the material receiving box, and the dust suction ports of several of the material receiving boxes are detachably connected to several of the dust suction pipes, and the dust suction pipes are connected with the inner cavity of the material receiving box through the dust suction port; the material guiding assembly is used to discharge the jujube fruits in the inner cavities of several screening rollers into the material receiving boxes respectively.

[0025] According to the automatic grading and screening device for jujube fruits provided by the present invention, the vibration filtering assembly includes a filter screen installed on the inner wall of the material receiving box, the filter screen is located above the dust suction port, and a plurality of vibration motors are installed at the bottom of the filter screen.

[0026] According to the automatic screening device for grading jujube fruits provided by the present invention, the inner wall of the screening roller is slidably connected with an inner layer roller, the inner layer roller is provided with a plurality of small-diameter through holes, the plurality of small-diameter through holes are arranged in one-to-one correspondence with the plurality of sieve holes, and the aperture of the small-diameter through holes is smaller than the aperture of the sieve holes;

[0027] An insertion rod is fixedly connected to one end of the inner roller, and a through groove is provided at one end of the screening roller. The insertion rod slides along the through groove and extends out of the screening roller. Two positioning holes are provided on the insertion rod. A positioning plate is installed on the outer wall of one end of the screening roller, and a positioning rod is threadedly connected to the positioning plate. An insertion block is rotatably connected to the bottom of the positioning rod, and the insertion block is detachably connected to the positioning hole. The material guiding assembly is used to discharge several jujube fruits in the inner cavity of the inner roller into the material receiving box respectively.

[0028] According to the automatic grading and screening device for jujube fruits provided by the present invention, the material guiding assembly includes an end material guiding box and a plurality of internal material guiding boxes, the end material guiding box and the plurality of internal material guiding boxes are fixedly mounted on the second bracket, the plurality of internal material guiding boxes respectively extend into the inner cavities of the plurality of inner layer rollers, the end material guiding box is mounted on an end of the second bracket away from the first bracket, and the bottoms of the plurality of internal material guiding boxes and the end material guiding box are respectively facing the plurality of material receiving boxes.

[0029] According to the jujube fruit grading automatic screening device provided by the present invention, the driving assembly comprises a driving motor mounted on the first bracket, the output shaft of the driving motor is equipped with two third sprockets arranged side by side, one of the first rotating shafts is equipped with a fourth sprocket, the outer wall of the screening roller is equipped with a fifth sprocket, and two adjacent fifth sprockets are connected by a second chain transmission;

[0030] One of the fifth sprocket and the fourth sprocket is drivingly connected to the two third sprockets via a third chain respectively.

[0031] According to the automatic grading and screening device for jujube fruits provided by the present invention, a baffle plate is installed on the top of one end of the first bracket away from the second bracket, the top surface of the first bracket is inclined, and the baffle plate is located at the lower end of the top surface of the first bracket.

[0032] According to the automatic jujube fruit grading and screening device provided by the present invention, the tops of the terminal material guide box and the plurality of internal material guide boxes are both open, and valve plates are installed in the terminal material guide box and the plurality of internal material guide boxes.

[0033] The present invention discloses the following technical effects:

[0034] The present invention drives a plurality of screening rollers and a feeding roller mechanism to rotate through a driving component, transmits the jujube fruits to be screened to a second support through the feeding roller mechanism, and screens the jujube fruits in sequence through the plurality of screening rollers. The synchronous rotation of the screening roller and the feeding roller mechanism can be achieved through the precise control of the driving component, thereby ensuring the stability and continuity of the screening process.

[0035] The invention realizes the step-by-step classification and screening of jujube fruits of different sizes by arranging a plurality of screening rollers side by side, and the aperture of the screen holes on each screening roller increases successively along the feeding direction, which not only improves the screening efficiency, but also ensures the accuracy of classification, reduces the damage to the fruit, and improves the classification quality;

[0036] The present invention discharges the screened jujube fruits in the inner cavities of several screening rollers into a material receiving mechanism in sequence for collection through a material guiding component, and the impurities and dust in the jujube fruits can be filtered and removed through a vibration filtering component in the material receiving mechanism, thereby further improving the screening efficiency and grading quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a front view of the present invention;

[0039] Figure 2 is an axonometric view of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the material receiving mechanism in the present invention;

[0041] Figure 4 It is a schematic diagram of the installation of the inner layer roller and the screening roller in the present invention;

[0042] Figure 5 It is a schematic diagram of the structure of the inner layer roller and the screening roller in the present invention.

[0043] Among them, 1. the first bracket; 2. the second bracket; 3. the screening roller; 4. the sieve hole; 5. the dust collecting box; 6. the fan; 7. the dust collecting plate; 8. the dust collecting tube; 9. the material conveying roller; 10. the base; 11. the mounting seat; 12. the spring; 13. the material collecting box; 14. the dust collecting port; 15. the filter screen; 16. the vibration motor; 17. the inner roller; 18. the small-diameter through hole; 19. the insertion rod; 20. the through groove; 21. the positioning hole; 22. the positioning plate; 23. the positioning rod; 24. the insertion block; 25. the end material guide box; 26. the inner material guide box; 27. the driving motor; 28. the material blocking plate; 29. ​​the handle. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Reference Figure 1-Figure 5 The present invention provides an automatic grading and screening device for jujube fruits, comprising:

[0047] A first bracket 1, on which a feeding roller mechanism is installed;

[0048] A second bracket 2, the second bracket 2 is installed on one side of the first bracket 1, and a plurality of screening rollers 3 arranged side by side are rotatably connected to the second bracket 2;

[0049] A driving assembly, which is mounted on the first bracket 1 and is used to drive a plurality of screening rollers 3 and a feeding roller mechanism to rotate;

[0050] A material receiving mechanism, which is installed on one side of the bottom of the second bracket 2, and a vibration filter assembly is installed in the material receiving mechanism;

[0051] A material guide assembly, which is mounted on the second bracket 2 and is used to discharge the jujube fruits in the inner cavities of the plurality of screening rollers 3 into the material receiving mechanism;

[0052] Among them, the screening roller 3 is provided with a screen hole 4, and the apertures of the screen holes 4 on the screening rollers 3 are increased in sequence along the feeding direction of the feeding roller mechanism;

[0053] In this way, the present invention drives the plurality of screening rollers 3 and the feeding roller mechanism to rotate through the driving assembly, and the jujube fruits to be screened are transmitted to the second bracket 2 through the feeding roller mechanism, and are screened in sequence through the plurality of screening rollers 3. Through the precise control of the driving assembly, the synchronous rotation of the screening roller 3 and the feeding roller mechanism can be achieved, thereby ensuring the stability and continuity of the screening process;

[0054] The present invention realizes the step-by-step classification and screening of jujube fruits of different sizes by arranging a plurality of screening rollers 3 in parallel, and the aperture of the screen holes 4 on each screening roller 3 increases successively along the feeding direction, which not only improves the screening efficiency, but also ensures the accuracy of classification, reduces the damage to the fruit, and improves the classification quality;

[0055] The present invention discharges the screened jujube fruits in the inner cavities of several screening rollers 3 into a material receiving mechanism in sequence for collection through a material guiding component. Impurities and dust in the jujube fruits can be filtered and removed through a vibration filtering component in the material receiving mechanism, thereby further improving the screening efficiency and grading quality.

[0056] Further optimization scheme, a dust box 5 is installed on the first bracket 1, a dust bag is installed in the dust box 5, a fan 6 is installed at one end of the dust box 5, a dust suction plate 7 and a plurality of dust suction pipes 8 are installed at the air inlet end of the fan 6, the dust suction plate 7 is installed on the first bracket 1, and is located below the feeding roller mechanism, and the plurality of dust suction pipes 8 are connected to the receiving mechanism;

[0057] When the fan 6 is started, suction is generated to absorb dust and impurities in the surrounding environment through the dust suction plate 7 and the dust suction pipe 8; the dust suction plate 7 is located below the feeding roller mechanism and effectively captures dust falling from the feeding roller 9; the dust suction pipe 8 guides the collected dust into the dust collecting box 5, and the dust collecting bag further filters it to prevent the dust from leaking out.

[0058] The dust suction pipe 8 is not only connected to the dust collecting box 5, but also connected to the dust suction port 14 of the material collecting mechanism, ensuring that when the jujube fruits fall into the material collecting box 13, the dust and impurities generated can also be sucked away in time to keep the working environment clean.

[0059] Further optimization scheme, the feeding roller mechanism includes:

[0060] A first rotating shaft, two first rotating shafts are arranged side by side, and both first rotating shafts are rotatably connected to the first bracket 1, and a first sprocket and a second sprocket are respectively installed at both ends of the first rotating shaft, and one of the first rotating shafts is drivingly connected to the driving assembly;

[0061] A first chain, wherein two first chains are provided, and the two first chains are respectively sleeved on the two first sprocket wheels and the two second sprocket wheels;

[0062] A plurality of material transfer rollers 9 are provided, and the plurality of material transfer rollers 9 are installed between the two first chains at intervals; a dust collecting plate 7 is located directly below the plurality of material transfer rollers 9;

[0063] In this arrangement, the driving assembly drives the two first rotating shafts to rotate synchronously through chain transmission, and the first sprocket and the second sprocket on the first rotating shaft are connected by the first chain, so that the two rows of transfer rollers 9 can rotate synchronously and stably; the transfer rollers 9 rotate with the first rotating shaft to transfer the jujube fruits from one end to the other end. During this period, the dust collection plate 7 is located below it to collect dust that may be generated.

[0064] Further optimized solution, the material receiving mechanism includes a base 10 installed on one side of the bottom of the second bracket 2, a plurality of mounting seats 11 are arranged above the base 10, the bottom of the mounting seat 11 is mounted on the top surface of the base 10 through a plurality of springs 12, a material receiving box 13 is detachably connected to the mounting seat 11, and a vibration filtering assembly is installed on the inner wall of the material receiving box 13;

[0065] A dust suction port 14 is installed at the bottom of the side wall of the material receiving box 13. The dust suction ports 14 of several material receiving boxes 13 are detachably connected to several dust suction pipes 8 respectively, and the dust suction pipes 8 are connected with the inner cavity of the material receiving box 13 through the dust suction ports 14; the material guiding component is used to discharge the jujube fruits in the inner cavities of several screening rollers 3 into the material receiving boxes 13 respectively.

[0066] Further optimized solution, the vibration filter assembly includes a filter screen 15 installed on the inner wall of the material receiving box 13, the filter screen 15 is located above the dust suction port 14, and a plurality of vibration motors 16 are installed at the bottom of the filter screen 15;

[0067] The material receiving box 13 is installed on the base 10 through the spring 12. After the vibration motor 16 is started, it drives the filter screen 15 to vibrate, effectively separating the jujube fruits from impurities. The dust suction port 14 is connected to the dust suction pipe 8 to ensure that the dust generated during the filtering process is collected; the material receiving box 13 is detachable for easy cleaning and replacement.

[0068] According to a further optimization scheme, the inner wall of the screening roller 3 is slidably connected with an inner roller 17, and a plurality of small-diameter through holes 18 are provided on the inner roller 17. The plurality of small-diameter through holes 18 are arranged in a one-to-one correspondence with the plurality of sieve holes 4, and the aperture of the small-diameter through holes 18 is smaller than the aperture of the sieve hole 4;

[0069] An insert rod 19 is fixedly connected to one end of the inner roller 17, a through slot 20 is provided at one end of the screening roller 3, the insert rod 19 slides along the through slot 20 and extends to the outside of the screening roller 3, two positioning holes 21 are provided on the insert rod 19, a positioning plate 22 is installed on the outer wall of one end of the screening roller 3, a positioning rod 23 is threadedly connected to the positioning plate 22, an insert block 24 is rotatably connected to the bottom of the positioning rod 23, and the insert block 24 is detachably connected to the positioning hole 21; the material guide assembly is used to discharge the jujube fruits in the inner cavity of the inner roller 17 into the material receiving box 13 respectively;

[0070] When it is necessary to adjust the effective aperture of the sieve hole 4 to adapt to different varieties of jujube fruits, first, rotate the positioning rod 23 to pull the plug block 24 out of the current positioning hole 21 to release the fixation of the inner roller 17; then, slide the plug rod 19 and the inner roller 17 fixed thereto along the through groove 20 until the small-aperture through hole 18 and the sieve hole 4 reach the desired overlap or misalignment state; when the position of the inner roller 17 is adjusted to the right position, rotate the positioning rod 23 again to insert the plug block 24 into another positioning hole 21 on the plug rod 19, thereby fixing the new position of the inner roller 17.

[0071] During the screening process, the jujube fruits are fed into the screening roller 3 and screened according to the aperture size of the sieve hole 4 or the small-aperture through hole 18. If the small-aperture through hole 18 coincides with the sieve hole 4, the actual screening aperture is determined by the small-aperture through hole 18; if they are misaligned, the sieve hole 4 is used as the screening aperture; the screened jujube fruits pass through the sieve hole 4 or the small-aperture through hole 18 and fall into the material guide assembly below. Through the above adjustment process, the effective aperture of the sieve hole 4 can be conveniently adjusted without replacing the entire screening roller 3, thereby reducing costs and improving the flexibility of the equipment. It is suitable for screening different varieties of jujube fruits, and different screening requirements can be met by simply adjusting the position of the inner roller 17.

[0072] Further optimized solution, the material guide assembly includes a terminal material guide box 25 and a plurality of internal material guide boxes 26, the terminal material guide box 25 and the plurality of internal material guide boxes 26 are fixedly mounted on the second bracket 2, the plurality of internal material guide boxes 26 are respectively extended into the inner cavities of the plurality of inner layer rollers 17, the terminal material guide box 25 is mounted on the end of the second bracket 2 away from the first bracket 1, and the bottoms of the plurality of internal material guide boxes 26 and the terminal material guide box 25 are respectively facing the plurality of material receiving boxes 13;

[0073] The inner material guide box 26 extends into the inner cavity of the inner roller 17 to collect the screened jujube fruits and guide them to the corresponding material receiving box 13. The terminal material guide box 25 is responsible for collecting the jujube fruits screened at the last stage.

[0074] According to a further optimized solution, a handle 29 is installed on the outer wall of the material receiving box 13, and the handle 29 is convenient for carrying.

[0075] According to a further optimized solution, the driving assembly includes a driving motor 27 mounted on the first bracket 1, and the output shaft of the driving motor 27 is equipped with two third sprockets arranged side by side, a fourth sprocket is mounted on one of the first rotating shafts, a fifth sprocket is mounted on the outer wall of the screening roller 3, and two adjacent fifth sprockets are connected by a second chain transmission;

[0076] One of the fifth sprockets and the fourth sprocket is connected to the two third sprockets through the third chain respectively; the driving motor 27 drives the screening roller 3 and the feeding roller mechanism to rotate synchronously through the third sprocket, the fourth sprocket, the fifth sprocket and the second chain to ensure the continuity and stability of the entire screening process.

[0077] To further optimize the solution, a cleaning brush roller (not shown in the figure) is rotatably connected to one side of the first bracket 1 close to the second bracket 2, and the cleaning brush roller is transmission-connected to the driving motor 27 through a sprocket chain. The cleaning brush can be used to roll and clean the jujube fruits before they are graded and screened, thereby improving the cleanliness of the jujube fruits before screening and improving the quality of the finished products; the cleaned dust and impurities are adsorbed by the dust suction plate 7 and introduced into the dust collecting box 5 for centralized collection.

[0078] To further optimize the solution, a baffle plate 28 is installed on the top of one end of the first bracket 1 away from the second bracket 2, the top surface of the first bracket 1 is inclined, and the baffle plate 28 is located at the lower end of the top surface of the first bracket 1; the baffle plate 28 and the inclined top surface of the first bracket 1 are designed to ensure that the jujube fruits will not slide from both sides and are centrally guided to the feeding roller mechanism.

[0079] To further optimize the solution, the tops of the terminal material guide box 25 and the plurality of internal material guide boxes 26 are both set to be open, and valve plates are installed in the terminal material guide box 25 and the plurality of internal material guide boxes 26, and the valve plates can control the outflow of the jujube fruits, which is convenient for collection and operation.

[0080] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0081] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technical users in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An automatic screening device for grading jujube fruits, characterized in that: include: A first bracket (1), wherein a feeding roller mechanism is mounted on the first bracket (1); A second bracket (2), the second bracket (2) being mounted on one side of the first bracket (1), and a plurality of screening rollers (3) arranged side by side being rotatably connected to the second bracket (2); A driving assembly, the driving assembly being mounted on the first bracket (1) and being used for driving the plurality of screening rollers (3) and the feeding roller mechanism to rotate; A material receiving mechanism, the material receiving mechanism being mounted on one side of the bottom of the second bracket (2), and a vibration filtering assembly being mounted in the material receiving mechanism; a material guide assembly, the material guide assembly being mounted on the second bracket (2) and being used for discharging the jujube fruits in the inner cavity of the screening roller (3) into the material receiving mechanism; The screening roller (3) is provided with sieve holes (4), and the apertures of the sieve holes (4) on the screening rollers (3) increase in sequence along the feeding direction of the feeding roller mechanism.

2. The automatic grading and screening device for jujube fruits according to claim 1 is characterized in that: A dust collecting box (5) is installed on the first bracket (1), a dust collecting bag is installed in the dust collecting box (5), a fan (6) is installed at one end of the dust collecting box (5), a dust collecting plate (7) and a plurality of dust collecting pipes (8) are installed at the air inlet end of the fan (6), the dust collecting plate (7) is installed on the first bracket (1) and is located below the feeding roller mechanism, and the plurality of dust collecting pipes (8) are connected to the receiving mechanism.

3. The automatic grading and screening device for jujube fruits according to claim 2 is characterized in that: The feeding roller mechanism comprises: A first rotating shaft, wherein two first rotating shafts are arranged side by side and both of the first rotating shafts are rotatably connected to the first bracket (1), a first sprocket and a second sprocket are respectively installed at both ends of the first rotating shaft, and one of the first rotating shafts is drivingly connected to the driving assembly; A first chain, wherein two first chains are provided, and the two first chains are respectively sleeved on the two first sprockets and the two second sprockets; A material transfer roller (9), wherein a plurality of the material transfer rollers (9) are provided, and the plurality of the material transfer rollers (9) are installed at intervals between the two first chains; and the dust collecting plate (7) is located directly below the plurality of the material transfer rollers (9).

4. The automatic grading and screening device for jujube fruits according to claim 2 is characterized in that: The material receiving mechanism comprises a base (10) mounted on one side of the bottom of the second bracket (2); a plurality of mounting seats (11) are arranged above the base (10); the bottom of the mounting seats (11) is mounted on the top surface of the base (10) via a plurality of springs (12); a material receiving box (13) is detachably connected to the mounting seat (11); and the vibration filtering assembly is mounted on the inner wall of the material receiving box (13); A dust suction port (14) is installed at the bottom of the side wall of the material receiving box (13); the dust suction ports (14) of a plurality of the material receiving boxes (13) are respectively detachably connected to a plurality of the dust suction pipes (8); the dust suction pipes (8) are connected to the inner cavity of the material receiving box (13) through the dust suction ports (14); and the material guiding assembly is used to discharge the jujube fruits in the inner cavities of a plurality of the screening rollers (3) into the material receiving boxes (13).

5. The automatic grading and screening device for jujube fruits according to claim 4 is characterized in that: The vibration filter assembly comprises a filter screen (15) installed on the inner side wall of the material receiving box (13), the filter screen (15) is located above the dust suction port (14), and a plurality of vibration motors (16) are installed at the bottom of the filter screen (15).

6. The automatic grading and screening device for jujube fruits according to claim 4 is characterized in that: The inner wall of the screening roller (3) is slidably connected to an inner layer roller (17), and the inner layer roller (17) is provided with a plurality of small-diameter through holes (18), the plurality of small-diameter through holes (18) are arranged in a one-to-one correspondence with the plurality of sieve holes (4), and the aperture of the small-diameter through holes (18) is smaller than the aperture of the sieve holes (4); One end of the inner roller (17) is fixedly connected with an insertion rod (19); one end of the screening roller (3) is provided with a through groove (20); the insertion rod (19) slides along the through groove (20) and extends out of the screening roller (3); two positioning holes (21) are provided on the insertion rod (19); a positioning plate (22) is installed on the outer wall of one end of the screening roller (3); a positioning rod (23) is threadedly connected to the positioning plate (22); an insertion block (24) is rotatably connected to the bottom of the positioning rod (23); the insertion block (24) is detachably connected to the positioning hole (21); the material guide assembly is used to discharge a plurality of jujube fruits in the inner cavity of the inner roller (17) into the material receiving box (13) respectively.

7. The automatic grading and screening device for jujube fruits according to claim 6 is characterized in that: The material guide assembly includes an end material guide box (25) and a plurality of internal material guide boxes (26), wherein the end material guide box (25) and the plurality of internal material guide boxes (26) are fixedly mounted on the second bracket (2), and the plurality of internal material guide boxes (26) respectively extend into the inner cavities of the plurality of inner layer rollers (17), and the end material guide box (25) is mounted at one end of the second bracket (2) away from the first bracket (1), and the bottoms of the plurality of internal material guide boxes (26) and the end material guide box (25) are respectively oriented toward the plurality of material receiving boxes (13).

8. The automatic grading and screening device for jujube fruits according to claim 3 is characterized in that: The driving assembly comprises a driving motor (27) mounted on the first bracket (1), the output shaft of the driving motor (27) being equipped with two third sprockets arranged side by side, one of the first rotating shafts being equipped with a fourth sprocket, the outer wall of the screening roller (3) being equipped with a fifth sprocket, and two adjacent fifth sprockets being connected by a second chain transmission; One of the fifth sprocket and the fourth sprocket is drivingly connected to the two third sprockets via a third chain respectively.

9. The automatic grading and screening device for jujube fruits according to claim 1, characterized in that: A material baffle plate (28) is installed on the top of one end of the first bracket (1) away from the second bracket (2); the top surface of the first bracket (1) is inclined, and the material baffle plate (28) is located at the lower end of the top surface of the first bracket (1).

10. The automatic grading and screening device for jujube fruits according to claim 7, characterized in that: The tops of the terminal material guide box (25) and the plurality of internal material guide boxes (26) are both open, and valve plates are installed in the terminal material guide box (25) and the plurality of internal material guide boxes (26).

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