Screening device and fruit and vegetable sorting machine

Abstract

The utility model relates to the field of fruit and vegetable sorting, and discloses a screening device and a fruit and vegetable sorting machine, the screening device comprises a rack, a plurality of first rolling shafts, a plurality of second rolling shafts and a driving mechanism, the plurality of first rolling shafts and the plurality of second rolling shafts are alternately arranged at intervals, and the plurality of first rolling shafts and the plurality of second rolling shafts are rotatably connected to the rack; a screening area is formed between the first rolling shaft and the second rolling shaft; the driving mechanism comprises a driving motor, a transmission rod, a first driving chain wheel, a second driving chain wheel, a first chain and a second chain, the output end of the driving motor is connected with the transmission rod, and the transmission rod is sleeved with the first driving chain wheel and the second driving chain wheel in parallel; the second chain is connected to the side, away from the screening area, of the second driving chain wheel, the first rolling shaft is connected with the first chain, and the second rolling shaft is connected with the second chain, so that the rotating direction of the first rolling shaft is opposite to that of the second rolling shaft. Through the arrangement, the arrangement of a plurality of driving motors is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fruit and vegetable sorting, in particular to a screening device and a fruit and vegetable sorting machine. Background Art

[0002] With economic development, people's income continues to increase, and their pursuit of material living standards is also constantly improving. By screening fruits and vegetables of different economic values, users can accurately purchase the fruits and vegetables of different grades they need, such as: cherries, tomatoes, apples, etc.

[0003] The Chinese utility model patent with announcement number CN217700164U disclosed a vegetable seedling sorting and packaging device on November 1, 2022, including a frame, a sorting component and a conveying component. The sorting component includes a front mounting frame and a rear mounting frame. A guide roller is rotatably connected between the front mounting frame and the rear mounting frame. The guide roller is arranged radially as a whole. The guide roller rotates driven by a guide motor. The inclined guide roller drives the vegetable seedlings to move while rotating, and the seedlings being conveyed fall into different areas according to their size.

[0004] Among them, a guide motor is arranged on the outside of the front mounting frame, and five guide motors are arranged. The five guide motors are respectively connected to five guide rollers so that the guide rollers rotate, and the product is transported between two adjacent guide rollers and is transported from one end of the guide roller to the other end.

[0005] However, when the number of guide rollers increases, the number of guide motors also needs to increase, resulting in an increase in the power consumption of the entire device, and the same power needs to be set to ensure a consistent conveying speed. Utility Model Content

[0006] The embodiments of the utility model aim to provide a screening device and a fruit and vegetable sorting machine, in order to solve the technical problems in the prior art that a single guide motor can only be connected to one guide roller, resulting in increased power consumption of the overall equipment and more troublesome power regulation of multiple guide motors.

[0007] In order to solve the above technical problems, the utility model provides a screening device, comprising: a frame; a first rolling shaft, wherein a plurality of the first rolling shafts are provided; a second rolling shaft, wherein a plurality of the second rolling shafts are provided, wherein the plurality of the first rolling shafts and the plurality of the second rolling shafts are alternately and spaced apart, wherein the opposite ends of each of the first rolling shafts are rotatably connected to the frame, and the opposite ends of each of the second rolling shafts are rotatably connected to the frame, wherein the first rolling shaft and the second rolling shaft are both inclined relative to a horizontal plane, and a screening area is formed between each of the first rolling shafts and an adjacent second rolling shaft; and a driving mechanism, wherein the driving mechanism comprises a driving motor, a transmission A movable rod, a first driving sprocket, a second driving sprocket, a first chain and a second chain, the driving motor is installed on the frame and is located below the screening area, the transmission rod is connected to the output end of the driving motor, the first driving sprocket and the second driving sprocket are parallelly sleeved on the transmission rod, the first chain is connected to the side of the first driving sprocket facing the screening area, the second chain is connected to the side of the second driving sprocket away from the screening area, the first rolling shaft is connected to the first chain, and the second rolling shaft is connected to the second chain, so that the rotation direction of the first rolling shaft is opposite to the rotation direction of the second rolling shaft.

[0008] Through the above structure, only one driving motor is used to complete the opposite rotation directions of a first rolling axis and a corresponding second rolling axis, and the rotation directions of multiple first rolling axes are the same, and the rotation directions of multiple second rolling axes are the same, thereby avoiding the situation of setting up multiple driving motors, thereby reducing the power loss of the overall screening device.

[0009] In some embodiments, the screening device of the fruit and vegetable sorting machine also includes a first automatic tensioning structure, which includes a first fixed frame, a first connecting shaft, a first tensioning sprocket, a first baffle and a first elastic member. The first fixed frame is installed on the frame and is located on one side of the first driving sprocket. The first fixed frame is provided with a first sliding groove. The first tensioning sprocket is sleeved on the first connecting shaft. The first connecting shaft passes through the first sliding groove and is slidably connected to the first fixed frame. The first chain is connected to the first tensioning sprocket. The first baffle is slidably connected to the first fixed frame. The first baffle abuts between the first connecting shaft and the first elastic member. The first elastic member is installed on the first fixed frame.

[0010] Through the above structure, the first chain will vibrate during transmission, and the first tensioning sprocket will also vibrate accordingly. The first tensioning sprocket drives the first connecting shaft, and the first connecting shaft drives the first baffle to slide on the first guide member along the length direction of the first guide groove; the first elastic member can resist the first baffle, and the first baffle can resist the first tensioning sprocket to prevent the first chain from being tightened or relaxed, thereby maintaining the tension of the first chain.

[0011] In some embodiments, the first automatic tensioning structure also includes a first auxiliary sprocket, which is installed on the frame, and the first driving sprocket and the first auxiliary sprocket are arranged along the arrangement direction of the first rolling axis and the second rolling axis, and the first slide groove is extended from the first driving sprocket to the first auxiliary sprocket, and the first chain is connected to the first auxiliary sprocket, and the first auxiliary sprocket is located below the first tensioning sprocket, and the part of the first chain located between the first auxiliary sprocket and the first tensioning sprocket is perpendicular to the extension direction of the first slide groove.

[0012] With the above structure, the arrangement direction of the first auxiliary sprocket and the first tensioning sprocket can make the portion of the first chain between the first auxiliary sprocket and the first tensioning sprocket perpendicular to the extension direction of the first slideway, so that the first tensioning sprocket is only subjected to the force of the first chain along the direction from the first rolling axis to the second rolling axis, reducing the loss caused by the first tensioning sprocket abutting against the side wall of the first slideway.

[0013] In some embodiments, the screening device also includes a second automatic tensioning structure, which includes a second fixed frame, a second connecting shaft, a second tensioning sprocket, a second baffle and a second elastic member. The second fixed frame is installed on the frame and is located on one side of the second driving sprocket. The second fixed frame is provided with a second slide groove. The second tensioning sprocket is sleeved on the second connecting shaft. The second connecting shaft passes through the second slide groove and is slidably connected to the second fixed frame. The second chain is connected to the second tensioning sprocket. The second baffle is slidably connected to the second fixed frame. The second baffle is abutted between the second connecting shaft and the second elastic member. The second elastic member is installed on the second fixed frame.

[0014] Through the above structure, the second chain will shake during transmission, and the second tensioning sprocket will also shake accordingly. The second tensioning sprocket drives the second connecting shaft, and the second connecting shaft drives the second baffle to move along the extension direction of the second slide groove. The second baffle abuts between the second elastic member and the second connecting shaft. The second elastic member can abut against the second baffle to prevent the second chain from being tightened or relaxed, thereby maintaining the tension of the second chain.

[0015] In some embodiments, the second automatic tensioning structure also includes a second auxiliary sprocket, the second driving sprocket, the second tensioning sprocket and the second auxiliary sprocket are arranged along the arrangement direction of the first rolling axis and the second rolling axis, the axis of the second driving sprocket and the axis of the second auxiliary sprocket are located on the same horizontal plane, the second tensioning sprocket is located above the second auxiliary sprocket, the second chain is connected to the second auxiliary sprocket, the second chain is connected to the side of the second tensioning sprocket facing the screening area, and the second slide groove is perpendicular to the arrangement direction of the first rolling axis and the second rolling axis.

[0016] With the above structure, when the second chain is tightened or relaxed, the second tensioning sprocket will be subjected to the oblique force of the second chain, and the second connecting shaft will slide up and down along the second slide slot and squeeze the slot wall of the second slide slot to cause loss. By setting the second auxiliary sprocket, the axis of the second auxiliary sprocket and the axis of the second driving sprocket are located on the same horizontal plane, so that the second chain is connected to the side of the second tensioning sprocket facing the screening area, so when the second chain is tightened or relaxed, the force of the second chain on the second tensioning sprocket is vertical, thereby avoiding the second connecting shaft from causing loss to the slot wall of the second slide slot.

[0017] In some embodiments, the frame includes a first frame, a second frame and a third frame, the first frame and the second frame are both connected to the third frame, the opposite ends of the first rolling axis are respectively rotatably connected to the first frame and the second frame, and the opposite ends of the second rolling axis are respectively rotatably connected to the first frame and the second frame; the first frame includes a first base, a first mounting frame and a first pull rod, the first base is connected to the third frame, the first mounting frame is slidably connected to the first base, the first pull rod is connected to one end of the first mounting frame, the length direction of the first mounting frame and the length direction of the first base are both perpendicular to the length direction of the first rolling axis, one end of the first rolling axis is rotatably connected to the first mounting frame, and one end of the second rolling axis is rotatably connected to the first base; pulling the first pull rod can move the first rolling axis closer to or away from the second rolling axis to adjust the size of the screening area.

[0018] Through the above structure, the first pull rod can be pulled to drive the multiple first rolling axes to move toward the second rolling axes, so that the size of the screening area between a first rolling axis and an adjacent second rolling axis can be changed. For example, the screening area between a first rolling axis and an adjacent second rolling axis becomes smaller to select products of different sizes; at the same time, another screening area between the first rolling axis and another adjacent second rolling axis becomes larger, but fruits and vegetables will not be placed in the other screening area to prevent fruits and vegetables that meet the size from falling from the other screening area.

[0019] In some embodiments, there is an anti-collision gap between the first mounting frame and the first base, and the first mounting frame, the anti-collision gap and the first base are arranged in sequence along the length direction of the first rolling shaft. The first mounting frame includes a first mounting seat, and the first mounting seat is sleeved on one end of the first rolling shaft so that the first rolling shaft is connected to the first mounting frame; the first base includes a second mounting seat, and the second mounting seat is sleeved on one end of the second rolling shaft so that the second rolling shaft is connected to the second frame.

[0020] Through the above structure, one end of the first rolling shaft is connected to the first mounting seat, the first mounting seat is connected to the first mounting frame, the second mounting seat is connected to the second frame, the first base and the second base are both located between the first mounting frame and the second mounting frame, and one end of the second rolling shaft is connected to the first mounting frame. When the first pull rod and the second pull rod are pulled at the same time, it is possible to avoid the end of the first rolling shaft from colliding with the end of the second rolling shaft.

[0021] In some embodiments, the screening device also includes a first steering structure and a second steering structure, the first steering structure is located on the side of the first mounting frame facing away from the first rolling axis, the first steering structure includes four first synchronous wheels, the four first synchronous wheels are located in the same plane and are respectively located at the four corners of a rectangle, and the first chain is connected to the four first synchronous wheels; the second steering structure is installed on the side of the first base facing the first mounting frame, and the second steering structure is accommodated in the anti-collision gap, the second steering structure includes four second synchronous wheels, the four second synchronous wheels are located in the same plane and are all connected to the first base, and the second chain is connected to the four second synchronous wheels.

[0022] Through the above structure, the anti-collision gap not only has an anti-collision effect, but also has a containing effect, so that the overall screening device structure is more compact.

[0023] In some embodiments, the first base includes a supporting plate and a sliding block, the sliding block is connected between the supporting plate and the first mounting frame, the supporting plate is provided with a fixing hole, a plurality of the fixing holes are provided, and the plurality of the fixing holes are spaced apart, the sliding block is provided with a mounting hole, and sliding the sliding block can align the mounting hole with one of the fixing holes.

[0024] Through the above structure, a plurality of fixing holes are provided to form a step-by-step adjustment, thereby facilitating the user to quickly select the position that needs to be adjusted.

[0025] The utility model also provides a fruit and vegetable sorting machine, comprising the screening device in any one of the above embodiments.

[0026] Compared with the prior art, in the embodiment of the utility model, by using only one driving motor, it is possible to complete the opposite rotation directions of a first rolling shaft and a corresponding second rolling shaft, and the rotation directions of multiple first rolling shafts are the same, and the rotation directions of multiple second rolling shafts are the same, that is, multiple first rolling shafts and multiple second rolling shafts are alternately arranged at intervals and the rotation directions are also opposite, avoiding the situation of setting up multiple driving motors, thereby reducing the power loss of the overall screening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] One or several embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 It is a structural schematic diagram of a screening device provided in one embodiment of the utility model;

[0029] Figure 2 yes Figure 1 A schematic diagram of the structure of the driving mechanism of the screening device;

[0030] Figure 3 yes Figure 1 A schematic cross-sectional view of the rotation direction of the first rolling shaft and the second rolling shaft of the screening device;

[0031] Figure 4 yes Figure 1 A schematic diagram of the structure of the first automatic tensioning structure and the second automatic tensioning structure of the screening device;

[0032] Figure 5 yes Figure 1 A schematic structural diagram of the first automatic tensioning structure and the second automatic tensioning structure of the screening device from another angle;

[0033] Figure 6 yes Figure 1 A schematic diagram of the structure of the frame of the screening device;

[0034] Figure 7 yes Figure 6 A partial enlarged schematic diagram of the middle part;

[0035] Figure 8 yes Figure 1 A schematic diagram of the structure in which the first rolling shaft and the second rolling shaft of the screening device are installed on the first frame;

[0036] Fig. 9 yes Figure 1 A schematic diagram of the structure in which the first rolling shaft and the second rolling shaft of the screening device are installed on the second frame;

[0037] Fig.10 yes Figure 1 A schematic diagram of the structure in which the first steering structure and the second steering structure of the screening device are installed on the first frame;

[0038] Fig.11 yes Figure 1 A schematic diagram of the structure of the first mounting frame and the first base of the screening device;

[0039] Fig.12 yes Figure 1 A schematic structural diagram of the first synchronous wheel, the first frame and the first base of the screening device;

[0040] Fig.13 yes Figure 1 A schematic diagram of the structure of the second synchronous wheel and the first base of the screening device;

[0041] Fig.14 yes Fig.11 Schematic diagram of the structure of the first base.

[0042] The reference numerals are as follows:

[0043] 100, screening device; 10, rack; 11, first frame; 111, first base; 1111, second mounting seat; 1112, supporting plate; 11121, fixing hole; 1113, sliding block; 11131, mounting hole; 1114, first mounting plate; 1115, second mounting plate; 1116, first transition plate; 11161, through hole; 1117, second transition plate; 112, first mounting frame; 1121, first mounting seat; 1122, first mounting frame body; 113, first pull rod; 12, second frame; 121, second base; 1211, fourth mounting seat; 122, second mounting frame; 1221, third mounting seat; 1222, second mounting frame body; 123, second pull rod; 13, third frame; 20, first rolling axis; 30, second rolling axis; 40, screening area; 41, first square direction; 42, second direction; 50, driving mechanism; 51, driving motor; 52, transmission rod; 53, first driving sprocket; 54, second driving sprocket; 55, first chain; 56, second chain; 60, first automatic tensioning structure; 61, first fixed frame; 611, first slide groove; 62, first connecting shaft; 63, first tensioning sprocket; 64, first baffle; 65, first guide member; 66, first elastic member; 67, first auxiliary sprocket; 70, second automatic tensioning structure; 71, second fixed frame; 711, second slide groove; 72, second connecting shaft; 73, second tensioning sprocket; 74, second baffle; 75, second guide member; 76, second elastic member; 77, second auxiliary sprocket; 80, anti-collision gap; 90, first steering structure; 901, first synchronous wheel; 92, second steering structure; 921, second synchronous wheel. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the utility model, the utility model is described in more detail in the following in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on another element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] Please also read Figure 1 , Figure 2 and Figure 3 , Figure 1 It is a structural schematic diagram of a screening device provided in one embodiment of the utility model; Figure 2 yes Figure 1 A schematic diagram of the structure of the driving mechanism of the screening device; Figure 3 yes Figure 1 A schematic cross-sectional view of the rotation direction of the first rolling shaft and the second rolling shaft of the screening device.

[0047] The screening device 100 provided in an embodiment of the utility model comprises a frame 10, a first rolling shaft 20, a second rolling shaft 30 and a driving mechanism 50; the first rolling shaft 20 and the second rolling shaft 30 are provided in plurality, the plurality of first rolling shafts 20 and the plurality of second rolling shafts 30 are arranged alternately and at intervals, the opposite ends of each first rolling shaft 20 are respectively rotatably connected to the frame 10, the opposite ends of each second rolling shaft 30 are respectively rotatably connected to the frame 10, the first rolling shaft 20 and the second rolling shaft 30 are both inclined relative to the horizontal plane, and a screening area 40 is formed between each first rolling shaft 20 and an adjacent second rolling shaft 30; the driving mechanism 50 comprises a driving motor 51, a transmission rod 52, and a transmission rod 54. 2. A first driving sprocket 53, a second driving sprocket 54, a first chain 55 and a second chain 56. The driving motor 51 is installed on the frame 10 and is located below the screening area 40. The transmission rod 52 is connected to the output end of the driving motor 51. The first driving sprocket 53 and the second driving sprocket 54 are parallelly sleeved on the transmission rod 52. The first chain 55 is connected to the side of the first driving sprocket 53 facing the screening area 40, and the second chain 56 is connected to the side of the second driving sprocket 54 away from the screening area 40. The first rolling shaft 20 is connected to the first chain 55, and the second rolling shaft 30 is connected to the second chain 56, so that the rotation direction of the first rolling shaft 20 is opposite to the rotation direction of the second rolling shaft 30.

[0048] For ease of explanation, in one embodiment, the product sorted by the screening device 100 of the fruit and vegetable sorting machine is taken as cherries, that is, the cherries are transported along the length direction of the first rolling shaft 20. The first rolling shaft 20 and the second rolling shaft 30 are arranged obliquely relative to the horizontal plane. When the cherries are placed in the screening area 40, the cherries are transported obliquely downward due to gravity. For ease of understanding, the direction in which the cherries are transported from one end of the first rolling shaft 20 to the other end of the first rolling shaft 20 is set as the first direction 41, and the opposite direction of the first direction 41 is set as the second direction 42. That is, after the cherries enter the screening device 100 of the fruit and vegetable sorting machine, the cherries are transported from one end of the first rolling shaft 20 to the other end of the first rolling shaft 20 along the first direction 41 under the action of gravity. During the transportation of the cherries, cherries smaller than the size of the screening area 40 will fall from the screening area 40 to achieve the purpose of screening the size of the cherries.

[0049] In one embodiment, the arrangement direction of the first rolling axis 20 to the second rolling axis 30 is perpendicular to the first direction 41 , and the rotation directions of the first rolling axis 20 and the second rolling axis 30 are opposite.

[0050] In order to realize that the first rolling shaft 20 and the second rolling shaft 30 move in opposite directions, in this embodiment, the output end of the driving motor 51 is connected to the transmission rod 52. For the convenience of description, here, from the perspective of the first direction 41, the driving motor 51 drives the transmission rod 52 to rotate in the clockwise direction, and the first driving sprocket 53 and the second driving sprocket 54 are both sleeved on the transmission rod 52, that is, from the perspective of the first direction 41, the first driving sprocket 53 and the second driving sprocket 54 both rotate in the clockwise direction. Among them, the first chain 55 is connected to the side of the first driving sprocket 53 facing the screening area 40, and the second chain 56 is connected to the side of the second driving sprocket 54 away from the screening area 40. The first driving sprocket 53 and the second driving sprocket 54 have the same rotation direction, but the movement direction of the first driving sprocket 53 toward the screening area 40 is opposite to the movement direction of the second driving sprocket 54 away from the screening area 40, so that the rotation direction of the first chain 55 is opposite to the rotation direction of the second chain 56. It can be seen from the accompanying drawings that, from the perspective along the first direction 41, the rotation direction of the first chain 55 is counterclockwise, and the rotation direction of the second chain 56 is clockwise, so that the first rolling shaft 20 rotates counterclockwise, and the movement direction of the second rolling shaft 30 rotates clockwise. The purpose of this arrangement is to use only one driving motor 51, that is, to complete the reverse rolling of the first rolling shaft 20 and an adjacent second rolling shaft 30, so as to reduce the situation of setting multiple motors, thereby reducing the power loss of the overall screening device 100. In addition, it can ensure that the rolling speed of the first rolling shaft 20 and the rolling speed of the second rolling shaft 30 are consistent, and avoid the situation where a single cherry jumps back and forth between multiple screening areas 40.

[0051] The rotation direction of the first rolling shaft 20 is opposite to that of the second rolling shaft 30. One side of a first rolling shaft 20 and one side of an adjacent second rolling shaft 30 both rotate downward, so that the cherries are further pushed downward during transportation, so as to facilitate the screening of a large number of cherries; the other side of a first rolling shaft 20 and one side of another adjacent second rolling shaft 30 both rotate upward, so as to form resistance to the cherries on the screening area 40, thereby increasing the time that the cherries remain on the screening area 40, so as to prevent the stacked cherries from being transported too quickly, resulting in some cherries that do not meet the size not being screened out.

[0052] See also Figure 1 , Figure 4 and Figure 5 , Figure 4 yes Figure 1 A schematic diagram of the structure of the first automatic tensioning structure and the second automatic tensioning structure of the screening device; Figure 5 yes Figure 1 A schematic structural diagram of the first automatic tensioning structure and the second automatic tensioning structure of the screening device from another angle;

[0053] In one embodiment, the screening device 100 also includes a first automatic tensioning structure 60, which includes a first fixed frame 61, a first connecting shaft 62, a first tensioning sprocket 63, a first baffle 64 and a first elastic member 66. The first fixed frame 61 is installed on the frame 10 and is located on one side of the first driving sprocket 53. The first fixed frame 61 is provided with a first slide groove 611. The first tensioning sprocket 63 is sleeved on the first connecting shaft 62. The first connecting shaft 62 passes through the first slide groove 611 and is slidably connected to the first fixed frame 61. The first chain 55 is connected to the first tensioning sprocket 63. The opposite sides of the first guide member 65 are connected to the first fixed frame 61. The first baffle 64 abuts between the first connecting shaft 62 and the first elastic member 66. The first elastic member 66 is installed on the first fixed frame 61.

[0054] In this embodiment, in order to ensure the stability of the first baffle plate 64 during the sliding process, the first automatic tensioning structure 60 further includes a first guide member 65 , which passes through the first baffle plate 64 , and the first baffle plate 64 is slidably connected to the first guide member 65 .

[0055] Specifically, the tension of the first chain 55 changes during the transmission process, that is, the first chain 55 becomes tight or loose, and the first tensioning sprocket 63 is connected to the first chain 55. The first tensioning sprocket 63 will vibrate due to the tightening or loosening of the first chain 55. The first tensioning sprocket 63 is connected to the first connecting shaft 62, and the first connecting shaft 62 passes through the first sliding groove 611 and is slidably connected to the first fixing frame 61. The first tensioning sprocket 63 vibrates to drive the first connecting shaft 62 to slide on the first sliding groove 611. One end of the first connecting shaft 62 abuts against the first baffle 64, and the first baffle 64 is slidably connected to the first guide member 65. The first baffle 64 abuts between the first connecting shaft 62 and the first elastic member 66. When the first connecting shaft 62 slides on the first sliding groove 611, it will drive the first baffle 64 to slide on the first guide member 65, and the first elastic member 66 will push the first baffle 64 to ensure the tension of the first chain 55.

[0056] In this embodiment, the first guide member 65 is substantially cylindrical, the first fixing frame 61 is substantially rectangular, both ends of the first guide member 65 are respectively connected to the inner wall of the first fixing frame 61, and the first elastic member 66 is a spring.

[0057] In one embodiment, the first automatic tensioning structure 60 also includes a first auxiliary sprocket 67, which is installed on the frame 10, and the first driving sprocket 53 and the first auxiliary sprocket 67 are arranged along the arrangement direction of the first rolling axis 20 and the second rolling axis 30. The first slide groove 611 is extended from the first driving sprocket 53 to the first auxiliary sprocket 67. The first chain 55 is connected to the first auxiliary sprocket 67, and the first auxiliary sprocket 67 is located below the first tensioning sprocket 63. The first chain 55 located between the first auxiliary sprocket 67 and the first tensioning sprocket 63 is vertically arranged relative to the extension direction of the first slide groove 611.

[0058] Specifically, the first driving sprocket 53 and the first auxiliary sprocket 67 are arranged along the arrangement direction of the first rolling shaft 20 and the second rolling shaft 30, and the first slide groove 611 is also extended along the arrangement direction of the first rolling shaft 20 and the second rolling shaft 30. The first auxiliary sprocket 67 is located below the first tensioning sprocket 63, and the first chain 55 is connected to the first tensioning sprocket 63 on the side facing the first driving sprocket 53. When the first chain 55 is tightened, the first tensioning sprocket 63 will receive a force away from the first driving sprocket 53, thereby driving the first connecting shaft 62 to slide along the first slide groove 611. The first auxiliary sprocket 67 can be roughly regarded as a fixed pulley. The first auxiliary sprocket 67 can change the transmission direction of the first chain 55. The portion of the first chain 55 between the first auxiliary sprocket 67 and the first tensioning sprocket 63 is vertically arranged relative to the extension direction of the first slide groove 611. The purpose of such arrangement is that if the first auxiliary sprocket 67 is not arranged, the force received by the first tensioning sprocket 63 away from the first driving sprocket 53 is roughly in an oblique downward direction, and the first slide groove 611 extends along the arrangement direction of the first rolling shaft 20 and the second rolling shaft 30. If the first tensioning sprocket 63 is set, the first tensioning sprocket 63 will cause pressure loss to the side wall of the first slide groove 611, and the placement state of the first chain 55 is changed by the setting of the first auxiliary sprocket 67. That is, in this embodiment, the first chain 55 is connected to the side of the first tensioning sprocket 63 close to the first driving sprocket 53, so that the first tensioning sprocket 63 is only subjected to the force of the first chain 55 along the arrangement direction of the first rolling axis 20 and the second rolling axis 30, thereby reducing the loss of the first tensioning sprocket 63 to the side wall of the first slide groove 611 and improving the life of the entire screening device 100.

[0059] In one embodiment, the screening device 100 also includes a second automatic tensioning structure 70, which includes a second fixed frame 71, a second connecting shaft 72, a second tensioning sprocket 73, a second baffle 74 and a second elastic member 76. The second fixed frame 71 is installed on the frame 10 and is located on one side of the second driving sprocket 54. The second fixed frame 71 is provided with a second slide groove 711. The second tensioning sprocket 73 is sleeved on the second connecting shaft 72. The second connecting shaft 72 passes through the second slide groove 711 and is slidably connected to the second fixed frame 71. The second chain 56 is connected to the second tensioning sprocket 73. The second elastic member 76 is installed on the second fixed frame 71.

[0060] In this embodiment, in order to ensure the stability of the second baffle plate 74 during the sliding process, the second automatic tensioning structure 70 also includes a second guide member 75, the opposite sides of the second guide member 75 are connected to the second fixed frame 71, the second guide member 75 passes through the second baffle plate 74, and the second baffle plate 74 is against the second connecting shaft 72 and the second elastic member 76.

[0061] Specifically, the second automatic tensioning structure 70 is similar to the first automatic tensioning structure 60 and has substantially the same principle, namely, ensuring the tension of the second chain 56 , which will not be elaborated herein.

[0062] In one embodiment, the second automatic tensioning structure 70 also includes a second auxiliary sprocket 77, the second drive sprocket 54, the second tensioning sprocket 73 and the second auxiliary sprocket 77 are arranged along the arrangement direction of the first rolling axis 20 and the second rolling axis 30, the axis of the second drive sprocket 54 and the axis of the second auxiliary sprocket 77 are located on the same horizontal plane, the second tensioning sprocket 73 is located above the second auxiliary sprocket 77, the second chain 56 is connected to the second auxiliary sprocket 77, the second chain 56 is connected to the second tensioning sprocket 73 facing the side of the screening area 40, and the second slide groove 711 is perpendicular to the arrangement direction of the first rolling axis 20 and the second rolling axis 30.

[0063] Specifically, for ease of understanding, the second drive sprocket 54 is described in conjunction with the accompanying drawings. The second drive sprocket 54 is located below the second tension sprocket 73. If the second auxiliary sprocket 77 is not provided, the second tension sprocket 73 is located above the second drive sprocket 54. When the second chain 56 is tightened or relaxed, the second tension sprocket 73 will be subjected to the oblique force of the second chain 56. At this time, the second connecting shaft 72 will slide up and down along the second slide groove 711 and squeeze the groove wall of the second slide groove 711 to form a loss. By providing the second auxiliary sprocket 77, the axis of the second auxiliary sprocket 77 and the axis of the second drive sprocket 54 are located on the same horizontal plane, so that the second chain 56 is connected to the second tension sprocket 73 on the side facing the screening area 40. At this time, when the second chain 56 is tightened or relaxed, the force of the second chain 56 on the second tension sprocket 73 is in the vertical direction in the figure, thereby preventing the second connecting shaft 72 from causing a loss to the groove wall of the second slide groove 711.

[0064] See also Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 , Figure 6 yes Figure 1 A schematic structural diagram of the screening device from another angle; Figure 7 yes Figure 6 A partial enlarged schematic diagram of the middle part; Figure 8 yes Figure 1 A schematic diagram of the structure in which the first rolling shaft and the second rolling shaft of the screening device are installed on the first frame;

[0065] Fig. 9 yes Figure 1 A schematic diagram of the structure in which the first rolling shaft and the second rolling shaft of the screening device are installed on the second frame.

[0066] In one embodiment, the frame 10 includes a first frame 11, a second frame 12 and a third frame 13, the first frame 11 and the second frame 12 are both connected to the third frame 13, the opposite ends of the first rolling shaft 20 are respectively rotatably connected to the first frame 11 and the second frame 12, and the opposite ends of the second rolling shaft 30 are respectively connected to the first frame 11 and the second frame 12; the first frame 11 includes a first base 111, a first mounting frame 112 and a first pull rod 113, the first base 111 is connected to the third frame 13, the first mounting frame 112 and the first pull rod 113 A mounting frame 112 is slidably connected to the first base 111, a first pull rod 113 is connected to one end of the first mounting frame 112, the length direction of the first mounting frame 112 and the length direction of the first base 111 are both perpendicular to the length direction of the first rolling shaft 20, one end of the first rolling shaft 20 is rotatably connected to the first mounting frame 112, and one end of the second rolling shaft 30 is rotatably connected to the first base 111; pulling the first pull rod 113 can move the first rolling shaft 20 closer to or away from the second rolling shaft 30 to adjust the size of the screening area 40.

[0067] Specifically, the first rod 113 is roughly in the shape of a handle, one end of the first rod 113 passes through the first mounting frame 112, the first rod 113 and the first mounting frame 112 are fixed by screws, the first mounting frame 112 is slidably connected to the first base 111, and the first mounting frame 112 can slide relative to the first base 111 along the length direction of the first mounting frame 112. So that the first rolling shaft 20 approaches or moves away from the second rolling shaft 20, thereby adjusting the size of the screening area 40.

[0068] In this embodiment, in order to further ensure that the first rolling shaft 20 is translated toward the second rolling shaft 30 during the process of adjusting the size of the screening area 40, in this embodiment, the second frame 12 includes a second base 121, a second mounting frame 122, and a second pull rod 123, the second base 121 is connected to the third frame 13, the second mounting frame 122 is slidably connected to the side of the second base 121 away from the first base 111, the second pull rod 123 is connected to one end of the second mounting frame 122, the length direction of the second mounting frame 122 and the length direction of the second base 121 are perpendicular to the length direction of the first rolling shaft 20, the other end of the first rolling shaft 20 is connected to the second mounting frame 122, and the other end of the second rolling shaft 30 is rotatably connected to the second base 121.

[0069] One end of the second pull rod 123 passes through the second mounting frame 122, and the second pull rod 123 and the second mounting frame 122 are fixed by screws. The second mounting frame 122 is slidably connected to the second base 121, and the second mounting frame 122 can slide relative to the second base 121 along the length direction of the second mounting frame 122. It should be noted that the opposite ends of the first rolling shaft 20 are connected to the first mounting frame 112 and the second mounting frame 122. The purpose of such a setting is that the first pull rod 113 and the second pull rod 123 need to be pulled at the same time, so that the first rolling shaft 20 can be translated along the length direction of the first mounting frame 112, so as to achieve the purpose of adjusting the size of the screening area 40. For example: the screening area 40 between a first rolling shaft 20 and an adjacent second rolling shaft 30 becomes smaller to select fruits and vegetables of different sizes; at the same time, another screening area 40 between the first rolling shaft 20 and another adjacent second rolling shaft 30 will become larger, but fruits and vegetables will not be placed in the other screening area 40, so as to avoid fruits and vegetables that meet the size from falling in the other screening area 40.

[0070] The purpose of pulling the first pull rod 113 and the second pull rod 123 at the same time is to ensure that the first rolling shaft 20 always remains parallel to the second rolling shaft 30 during the movement along the length direction of the first mounting frame 112. If the first rolling shaft 20 and the second rolling shaft 30 are in the same plane, and the first rolling shaft 20 is tilted relative to the second rolling shaft 30, the gap between the first rolling shaft 20 and the second rolling shaft 30 is not equal everywhere, and cherries that meet the size will fall in the gap with a large size, and the effect of screening the size cannot be achieved.

[0071] Here, it should be noted that the first base 111 and the second base 121 are located between the first mounting frame 112 and the second mounting frame 122, the opposite ends of the first rolling shaft 20 are respectively connected to the first mounting frame 112 and the second mounting frame 122, and the opposite ends of the second rolling shaft 30 are respectively connected to the first base 111 and the second base 121, that is, the length of the first rolling shaft 20 is greater than the length of the second rolling shaft 30, and the opposite ends of the first rolling shaft 20 protrude from the opposite ends of the second rolling shaft 30 in the length direction of the first rolling shaft 20. The purpose of this arrangement is that when the first rolling shaft 20 is pulled, it will not interfere with the second rolling shaft 30.

[0072] In one embodiment, the first mounting frame 112 and the first base 111 have an anti-collision gap 80 along the length direction of the first rolling shaft 20. The first mounting frame 112, the anti-collision gap 80 and the first base 111 are arranged in sequence along the length direction of the first rolling shaft 20. The first mounting frame 112 includes a first mounting seat 1121, which is sleeved on one end of the first rolling shaft 20 so that the first rolling shaft 20 is rotatably connected to the first mounting frame 112; the first base 111 includes a second mounting seat 1111, which is sleeved on one end of the second rolling shaft 30 so that the second rolling shaft 30 is rotatably connected to the second frame 12.

[0073] Specifically, the first mounting frame 112 and the first base 111 have an anti-collision gap 80 along the length direction of the first rolling shaft 20, and the first base 111 is generally L-shaped. The opposite ends of the first rolling shaft 20 are rotatably connected to the first mounting frame 112 and the second mounting frame 122 respectively; the opposite ends of the second rolling shaft 30 are rotatably connected to the first base 111 and the second base 121 respectively.

[0074] The purpose of such arrangement is to make the end of the first rolling shaft 20 and the end of the second rolling shaft 30 spaced apart in the first direction 41, so as to avoid collision between the end of the first rolling shaft 20 and the end of the second rolling shaft 30 when adjusting the size of the screening area 40. In this embodiment, the length of the first rolling shaft 20 is greater than the length of the second rolling shaft 30, so such arrangement is conducive to distinguishing the first rolling shaft 20 from the second rolling shaft 30, and is also convenient for later maintenance and replacement.

[0075] Moreover, the first mounting frame 112 includes a first mounting seat 1121 and a first mounting frame body 1122. The first mounting seat 1121 is installed on the first mounting frame body 1122 by bolts. One end of the first rolling shaft 20 passes through the first mounting seat 1121. A bearing is provided in the first mounting seat 1121. The bearing is sleeved on one end of the first rolling shaft 20 so that the first rolling shaft 20 is rotatably connected to the first mounting frame 112.

[0076] The second mounting frame 122 includes a third mounting seat 1221 and a second mounting frame body 1222. The third mounting seat 1221 is installed on the second mounting frame body 1222 by bolts. One end of the first rolling shaft 20 is inserted into the third mounting seat 1221. The third mounting seat 1221 is sleeved on one end of the first rolling shaft 20 so that the first rolling shaft 20 is rotatably connected to the second mounting frame 122.

[0077] The fourth mounting seat 1211 is fixedly mounted on the second base 121 . The fourth mounting seat 1211 is sleeved on the second rolling shaft 30 , so that the second rolling shaft 30 is rotatably connected to the second mounting frame 122 .

[0078] See also Figure 1 , Figure 8 , Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.14 , Fig.10 yes Figure 1 A schematic diagram of the structure in which the first steering structure and the second steering structure of the screening device are installed on the first frame; Fig.11 yes Figure 1 A schematic diagram of the structure of the first base and the first mounting frame of the screening device;

[0079] Fig.12 yes Figure 1 A schematic structural diagram of the first synchronous wheel, the first frame and the first base of the screening device; Fig.13 yes Figure 1 A schematic diagram of the structure of the second synchronous wheel and the first base of the screening device; Fig.14 yes Fig.11 Schematic diagram of the structure of the first base.

[0080] In one embodiment, the screening device 100 also includes a first steering structure 90 and a second steering structure 92. The first steering structure 90 is located on the side of the first mounting frame 112 that is away from the first rolling shaft 20. The first steering structure 90 includes four first synchronous wheels 901. The four first synchronous wheels 901 are located in the same plane and are respectively located at the four corners of a rectangle. The first chain 55 is connected to the four first synchronous wheels 901; the second steering structure 92 is accommodated in the anti-collision gap 80. The second steering structure 92 includes four second synchronous wheels 921. The four second synchronous wheels 921 are located in the same plane and are all connected to the first base 111. The four second synchronous wheels 921 are located in the same plane and are all connected to the first base 111. The second chain 56 is connected to the four second synchronous wheels 921.

[0081] Specifically, the first steering structure 90 includes at least two first synchronous wheels 901. In this embodiment, the first steering structure 90 includes four first synchronous wheels 901, wherein two first synchronous wheels 901 are connected to opposite sides of the first mounting frame 112, and the other two first synchronous wheels 901 are connected to opposite sides of the first base 111. The four first synchronous wheels 901 are located in the same plane and are respectively located at the four corners of a rectangle. The first chain 55 is connected to the four first synchronous wheels 901. The four first synchronous wheels 901 can be regarded as fixed pulleys to achieve the effect of steering the first chain 55. The multiple first rolling shafts 20 are all connected to the first chain 55 to ensure that the rotation effects of the multiple first rolling shafts 20 are consistent.

[0082] The four second synchronous wheels 921 are located in the same plane and at the four corners of an isosceles trapezoid. The second chain 56 is connected to the four second synchronous wheels 921. The four second synchronous wheels 921 can be regarded as fixed pulleys to achieve the effect of steering the second chain 56. Multiple second rolling shafts 30 are all connected to the second chain 56 to ensure that the steering effects of the multiple second rolling shafts 30 are consistent.

[0083] It should be noted that the pattern presented by the placement positions of the four second synchronous wheels 921 is different from the pattern presented by the placement positions of the four first synchronous wheels 901 because the tensioning force directions prevented by the first automatic tensioning structure 60 and the second automatic tensioning structure 70 are different.

[0084] The anti-collision gap 80 can prevent the first rolling shaft 20 and the second rolling shaft 30 from colliding, and can also accommodate the second steering structure 92, so that the structure of the overall screening device 100 is more compact. In one embodiment, the first base 111 includes a supporting plate 1112 and a sliding block 1113, the sliding block 1113 is connected between the supporting plate 1112 and the first mounting frame 112, the supporting plate 1112 is provided with a fixing hole 11121, the fixing hole 11121 is provided with a plurality of fixing holes 11121, and the plurality of fixing holes 11121 are arranged at intervals, the sliding block 1113 is provided with a mounting hole 11131, and the sliding of the sliding block 1113 can align the mounting hole 11131 with one of the fixing holes 11121.

[0085] Specifically, the sliding block 1113 is connected to the first mounting frame 112, and the first pull rod 113 is pulled, and the first mounting frame 112 drives the sliding block 1113 to slide along the surface of the supporting plate 1112, and the mounting hole 11131 on the sliding block 1113 is aligned with a fixing hole 11121 of the supporting plate 1112, so as to complete the adjustment of the screening area 40. The purpose of such a setting is that a plurality of fixing holes 11121 are provided to form a step-by-step adjustment, so that the user can quickly select the position to be adjusted.

[0086] In this embodiment, in order to facilitate the user to pull the first mounting frame 112 and lock the first mounting frame 112 and the supporting plate 1112, the mounting hole 11131 passes through the sliding block 1113, and the first mounting frame 112 is provided with a locking cavity and a locking opening, the locking cavity runs through the inside of the first mounting frame 112, and the locking opening communicates between the locking cavity and the outside. When the user needs to lock the sliding block 1113 and the supporting plate 1112, the user can insert the screw into the sliding block 1113 and the supporting plate 1112 through the locking opening to complete the locking.

[0087] In this embodiment, two opposite sides of the supporting plate 1112 are welded to the third frame body 13 , and the supporting plate 1112 also supports the first mounting frame 112 .

[0088] In one embodiment, the first base 111 also includes a first mounting plate 1114, a second mounting plate 1115, a first transition plate 1116 and a second transition plate 1117. The first mounting plate 1114, the second mounting plate 1115, the first transition plate 1116, the second transition plate 1117 and the supporting plate 1112 are connected in sequence and are an integrally formed structure. The first mounting plate 1114, the first transition plate 1116 and the supporting plate 1112 are arranged in parallel, the second mounting plate 1115 and the second transition plate 1117 are arranged in parallel, and the second mounting plate 1115 is vertically bent downward relative to the first mounting plate 1114; a through hole 11161 is opened on the first transition plate 1116, and the second chain 56 passes through the through hole and is connected to the second steering structure 92.

[0089] Specifically, the second mounting plate 1115, the first transition plate 1116 and the second transition plate 1117 enclose an anti-collision gap 80, the second steering structure 92 is mounted on the second mounting plate 1115, two second synchronous wheels 921 are located on opposite sides of the second mounting plate 1115, and the other two second synchronous wheels 921 are located between the two second synchronous wheels 921 and below the two second synchronous wheels 921. The second chain 56 passes through the through hole 11161 and is connected to the four second synchronous wheels 921 to make the overall structure more compact.

[0090] Furthermore, the first transition plate 1116 , the second transition plate 1117 and the supporting plate 1112 are sequentially connected and are an integrally formed structure, so that the first base 111 has a stronger structural strength and a lower manufacturing cost.

[0091] In addition, the first mounting plate 1114, the second mounting plate 1115, the first transition plate 1116, the second transition plate 1117 and the supporting plate 1112 are all welded to the third frame 13. The purpose of this arrangement is that during the inspection or maintenance of the screening device 100, only the first mounting frame 112 needs to be disassembled, thereby improving efficiency.

[0092] Another embodiment of the utility model further provides a fruit and vegetable sorting machine, which includes the screening device 100 in any of the above implementations, that is, the fruit and vegetable sorting machine has the beneficial effects of the above screening device 100.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A screening device, characterized in that: include: frame; A first rolling shaft, wherein a plurality of first rolling shafts are provided; a second rolling shaft, wherein a plurality of the second rolling shafts are provided, the plurality of the first rolling shafts and the plurality of the second rolling shafts are alternately and spaced apart, the opposite ends of each of the first rolling shafts are respectively rotatably connected to the frame, the opposite ends of each of the second rolling shafts are respectively rotatably connected to the frame, the first rolling shaft and the second rolling shaft are both inclined relative to a horizontal plane, and a screening area is formed between each of the first rolling shafts and an adjacent second rolling shaft; A driving mechanism, the driving mechanism comprising a driving motor, a transmission rod, a first driving sprocket, a second driving sprocket, a first chain and a second chain, the driving motor being mounted on the frame and located below the screening area, the transmission rod being connected to the output end of the driving motor, the first driving sprocket and the second driving sprocket being sleeved on the transmission rod in parallel, the first chain being connected to a side of the first driving sprocket facing the screening area, the second chain being connected to a side of the second driving sprocket facing away from the screening area, the first rolling shaft being connected to the first chain, and the second rolling shaft being connected to the second chain, so that a rotation direction of the first rolling shaft is opposite to a rotation direction of the second rolling shaft.

2. The screening device according to claim 1, characterized in that: It also includes a first automatic tensioning structure, which includes a first fixed frame, a first connecting shaft, a first tensioning sprocket, a first baffle and a first elastic member. The first fixed frame is installed on the frame, and the first fixed frame is provided with a first sliding groove. The first tensioning sprocket is sleeved on the first connecting shaft. The first connecting shaft passes through the first sliding groove and is slidably connected to the first fixed frame. The first chain is connected to the first tensioning sprocket. The first baffle is slidably connected to the first fixed frame. The first baffle abuts between the first connecting shaft and the first elastic member. The first elastic member is installed on the first fixed frame.

3. The screening device according to claim 2, characterized in that: The first automatic tensioning structure also includes a first auxiliary sprocket, which is installed on the frame, the first driving sprocket and the first auxiliary sprocket are arranged along the arrangement direction of the first rolling axis and the second rolling axis, the first slide groove is extended from the first driving sprocket to the first auxiliary sprocket, the first chain is connected to the first auxiliary sprocket, the first auxiliary sprocket is located below the first tensioning sprocket, and the part of the first chain located between the first auxiliary sprocket and the first tensioning sprocket is perpendicular to the extension direction of the first slide groove.

4. The screening device according to claim 1, characterized in that: It also includes a second automatic tensioning structure, which includes a second fixed frame, a second connecting shaft, a second tensioning sprocket, a second baffle and a second elastic member. The second fixed frame is installed on the frame and is located on one side of the second driving sprocket. The second fixed frame is provided with a second sliding groove. The second tensioning sprocket is sleeved on the second connecting shaft. The second connecting shaft passes through the second sliding groove and is slidably connected to the second fixed frame. The second chain is connected to the second tensioning sprocket. The second baffle is slidably connected to the second fixed frame. The second baffle abuts between the second connecting shaft and the second elastic member. The second elastic member is installed on the second fixed frame.

5. The screening device according to claim 4, characterized in that: The second automatic tensioning structure also includes a second auxiliary sprocket, the second driving sprocket, the second tensioning sprocket and the second auxiliary sprocket are arranged along the arrangement direction of the first rolling axis and the second rolling axis, the axis of the second driving sprocket and the axis of the second auxiliary sprocket are located on the same horizontal plane, the second tensioning sprocket is located above the second auxiliary sprocket, the second chain is connected to the second auxiliary sprocket, the second chain is connected to the side of the second tensioning sprocket facing the screening area, and the second slide groove is perpendicular to the arrangement direction of the first rolling axis and the second rolling axis.

6. The screening device according to claim 1, characterized in that: The frame includes a first frame, a second frame and a third frame, the first frame and the second frame are both connected to the third frame, the opposite ends of the first rolling shaft are respectively rotatably connected to the first frame and the second frame, and the opposite ends of the second rolling shaft are respectively rotatably connected to the first frame and the second frame; the first frame includes a first base, a first mounting frame and a first pull rod, the first base is connected to the third frame, the first mounting frame is slidably connected to the first base, the first pull rod is connected to one end of the first mounting frame, the length direction of the first mounting frame and the length direction of the first base are both perpendicular to the length direction of the first rolling shaft, one end of the first rolling shaft is rotatably connected to the first mounting frame, and one end of the second rolling shaft is rotatably connected to the first base; pulling the first pull rod can move the first rolling shaft close to or away from the second rolling shaft to adjust the size of the screening area.

7. The screening device according to claim 6, characterized in that: An anti-collision gap is provided between the first mounting frame and the first base, the first mounting frame, the anti-collision gap and the first base are arranged in sequence along the length direction of the first rolling shaft, the first mounting frame comprises a first mounting seat, and the first mounting seat is sleeved on one end of the first rolling shaft so that the first rolling shaft is connected to the first mounting frame; The first base includes a second mounting seat, and the second mounting seat is sleeved on one end of the second rolling shaft so that the second rolling shaft is connected to the second frame.

8. The screening device according to claim 7, characterized in that: A first steering structure and a second steering structure, wherein the first steering structure is located on a side of the first mounting frame facing away from the first rolling axis, the first steering structure includes four first synchronous wheels, the four first synchronous wheels are located in the same plane and are respectively located at four corners of a rectangle, and the first chain is connected to the four first synchronous wheels; the second steering structure is installed on a side of the first base facing the first mounting frame, and the second steering structure is accommodated in the anti-collision gap, the second steering structure includes four second synchronous wheels, the four second synchronous wheels are located in the same plane and are all connected to the first base, and the second chain is connected to the four second synchronous wheels.

9. The screening device according to claim 6, characterized in that: The first base includes a supporting plate and a sliding block, the sliding block is connected between the supporting plate and the first mounting frame, the supporting plate is provided with a fixing hole, a plurality of the fixing holes are provided, and the plurality of the fixing holes are spaced apart, the sliding block is provided with a mounting hole, and sliding the sliding block can align the mounting hole with one of the fixing holes.

10. A fruit and vegetable sorting machine, characterized in that: Comprising the screening device according to any one of claims 1 to 9.

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