Automatic quantitative feeding device for granular materials

Abstract

The utility model relates to an automatic quantitative feeding device for granular materials, which is characterized in that the automatic quantitative feeding device for the granular materials comprises a rack, and a material mixing mechanism, a feeding mechanism and a weight rechecking mechanism which are sequentially arranged on the rack from top to bottom, the feeding mechanism comprises a plurality of groups of first measuring cups and second measuring cups of which ports are coaxially nested with each other, and a lifting rotating mechanism for driving the first measuring cups and the second measuring cups to synchronously rotate or relatively get away from each other and get close to each other; according to the automatic quantitative feeding device for the granules, the mixing mechanism, the feeding mechanism and the weight rechecking mechanism are matched with one another, so that the procedures of automatic mixing, feeding, rechecking and the like of the granules are realized, manual operation is not needed in the whole process, the labor cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of automatic quantitative feeding of granular materials, in particular to an automatic quantitative feeding device for granular materials, and the granular materials can be materials such as rice and nuts. Background Technique

[0002] Before granular products (materials such as rice and nuts) are sold, it is necessary to quantitatively feed and package the granular materials. Due to the characteristics of irregular appearance, uneven volume and easy dispersion of the granular materials, when quantitatively feeding and packaging them, the actual feeding quality often does not match the packaging target quality. Therefore, generally, a manual or machine re-inspection process is arranged at the end of the production line to re-inspect the packaging quality of the products; and when there is a large deviation in the actual feeding quality, the system cannot adjust itself, and manual shutdown and maintenance adjustment are still required. The maintenance adjustment takes a long time, causing the production line to stagnate and affecting the production efficiency.

[0003] For example, in the Chinese patent "A Granular Material Quantitative Mechanism" with the publication number CN220315353U, it includes a feeding mechanism, which includes a plurality of longitudinally arranged bins, and a granular material channel from top to bottom is formed between the bins; a blanking mechanism, which is arranged on the lower side of the feeding mechanism, and the blanking mechanism includes: a material box, the bottom of the box is a plane, and a plurality of material grooves are opened on the bottom of the box; an adjusting component, which includes an adjusting block, and the adjusting block is slidably connected to the material groove, and the adjusting component can adjust the internal space size of the material groove by moving the adjusting block; a closing component, which is located on the lower side of the material box, and includes a plurality of closing parts, and the closing parts can rotate and close the lower side of the material groove. Although this patent can realize quantitative packaging and material crushing, its structure is complex, the manufacturing cost is high, and it cannot realize the adjustment of weight error, affecting the production efficiency. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of the utility model is to provide an automatic quantitative feeding device for granular materials, which can realize the quantitative feeding of granular materials, and at the same time can self-adjust the feeding weight, effectively reducing the error generated by quantitative feeding.

[0005] The technical solution of the utility model is: an automatic quantitative feeding device for granular materials, which is characterized in that: it includes a frame, a mixing mechanism, a feeding mechanism and a weight re-inspection mechanism that are successively arranged on the frame from top to bottom, and the feeding mechanism includes a plurality of groups of first measuring cups, second measuring cups with coaxially nested ports, and a lifting and rotating mechanism that drives the first measuring cup and the second measuring cup to rotate synchronously or move relatively away from and close to each other;

[0006] The lifting and rotating mechanism includes a ball screw spline shaft, a nut sleeve connected to the ball screw spline shaft and driven to rotate by a second motor, a first spline sleeve connected to the ball screw spline shaft and driven to rotate by a first motor, and a second spline sleeve connected to the ball screw spline shaft. Driven by the second motor, the nut sleeve rotates, and then drives the ball screw spline shaft in the nut sleeve to lift. Driven by the first motor, the first spline sleeve rotates, drives the ball screw spline shaft in the first spline sleeve to rotate, and then drives the second spline sleeve to rotate synchronously;

[0007] The upper middle part of the ball screw spline shaft is fixedly connected with a support sleeve, and a grooved rotating disk is fixedly connected to the support sleeve. A plurality of the first measuring cups are arranged through the bottom plate of the groove of the rotating disk.

[0008] The second spline sleeve is connected to a limit plate, and a plurality of the second measuring cups are arranged through the limit plate. The rotation of the second spline sleeve drives the second measuring cups and the first measuring cups to rotate.

[0009] Preferably, the mixing mechanism 1 includes a cylindrical body and two parallel screws arranged in the cylindrical body. The upper part of the cylindrical body has a mixing feed inlet, and the lower part of the cylindrical body has a mixing discharge outlet. The mixing discharge outlet is opposite to the inlet of the rotating disk, so that the mixed material is introduced into the rotating disk.

[0010] Preferably, the upper end of the ball screw spline shaft is connected with a first mounting plate, and a guiding optical shaft is fixedly installed on the side of the first mounting plate. The guiding optical shaft sequentially passes through a linear bearing installed on a second mounting plate and a through hole on a third mounting plate from top to bottom. During the lifting process of the ball screw spline shaft, the guiding optical shaft lifts in the linear bearing and the through hole.

[0011] Preferably, a fourth mounting plate is installed below the third mounting plate. The second motor is fixedly installed on the fourth mounting plate, and the nut sleeve is rotatably connected. The nut sleeve is axially limited on the fourth mounting plate, so that the nut sleeve can only rotate and cannot move axially. The output shaft of the second motor drives the nut sleeve to rotate through a second gear pair. The inner peripheral wall of the nut sleeve is threadedly connected with the outer peripheral wall of the ball screw spline shaft, so as to drive the nut sleeve to rotate through the second gear pair by the output shaft of the second motor and force the ball screw spline shaft to axially lift.

[0012] Preferably, the first motor is fixedly arranged on the third mounting plate. The output shaft of the first motor drives the first spline sleeve and the ball screw spline shaft to rotate through a first gear pair, and then drives the second spline sleeve rotatably connected to the second mounting plate and the limit plate fixedly installed on the second spline sleeve to rotate.

[0013] Preferably, a switching valve is provided at the lower port of the second measuring cup. The switching valve includes a circular ring fixed to the lower end of the second measuring cup and a disc rotatably connected to the circular ring at the side. A torsion spring is installed on the rotating connection shaft of the disc and the circular ring at the side, so that the disc rotates to the lower port of the second measuring cup to achieve sealing. A convex block capable of laterally pushing the disc is fixedly provided on the third mounting plate. When the second measuring cup and the disc rotate with the limiting plate, the disc is pushed by the convex block, causing the disc to rotate around the connecting shaft at the side to be misaligned with the lower port of the second measuring cup. The materials in the second measuring cup and the first measuring cup fall by gravity. A material discharge port is provided on the second mounting plate, and a discharge elbow is connected below the material discharge port. The outlet end of the discharge elbow leads to the inlet end of the weight recheck mechanism.

[0014] Preferably, the weight recheck mechanism includes a weighing hopper as the inlet end, a distribution plate, and a material and waste collection tank. The bottom of the weighing hopper is inclined, so that the material can slide into the distribution plate due to gravity. A weighing sensor installed on the base is provided below the weighing hopper. A hatch is provided on the side of the weighing hopper to communicate between the weighing hopper and the distribution plate, and the hatch is driven to lift and lower by a second lead screw nut pair located above it.

[0015] Preferably, the distribution plate is driven to axially move by a first lead screw nut pair. The distribution plate includes an inclined bottom surface that can be connected to the inclined surface of the weighing hopper bottom. Two wedge-shaped plates are provided on the bottom surface. The first opening of the wedge-shaped plate near the weighing hopper is larger, and the second opening of the wedge-shaped plate near the material and waste collection tank is smaller. A vertical partition is provided on the material and waste collection tank to divide the material and waste collection tank into two isolation chambers. Under the drive of the first lead screw nut pair, the distribution plate axially moves to selectively introduce the material in the distribution plate into one of the two isolation chambers.

[0016] The working method of the automatic quantitative feeding device for granular materials of the present utility model is characterized in that: the granular materials are evenly mixed in the mixing mechanism and input from the mixing discharge port into the rotating disk of the feeding mechanism. A baffle is installed below the first mounting plate. During the rotation of the rotating disk driven by the first motor and the second motor, the materials in the rotating disk are scraped into and filled in the first measuring cup and the second measuring cup. When the second measuring cup and the disk rotate to be pushed by the convex block, the disk is gradually pushed open, and the full-load materials in the first measuring cup and the second measuring cup fall by gravity through the blanking port and the discharge elbow pipe into the weight recheck mechanism. After being weighed in the weight recheck mechanism, when the weight meets the predetermined weight, each mechanism operates as described above. When the weight weighed in the weight recheck mechanism does not meet the predetermined weight, the first motor maintains the original rotation speed and direction, and the second motor changes the original rotation speed or direction to drive the ball screw spline shaft, the rotating disk and the first measuring cup to lift, so that the weight of the full-load materials in the first measuring cup and the second measuring cup changes until the weight of the materials output to the weight recheck mechanism meets the predetermined weight. Then the second motor resumes the original rotation speed and direction and drives the rotating disk, the limiting plate, the first measuring cup and the second measuring cup to rotate simultaneously with the first motor.

[0017] Preferably, when the first motor works, the second motor rotates in the opposite direction at a constant speed, so that the ball screw spline shaft only rotates without lifting movement. When the second motor works, the first motor stops working, realizing that the ball screw spline shaft only lifts without rotating movement. After the materials are weighed in the weighing hopper of the weight recheck mechanism, the bin door is driven to open by the second lead screw nut pair, and the materials slide from the inclined plane at the bottom of the trough into the distribution plate. When the weight meets the preset weight, the first lead screw nut pair drives the distribution plate, so that the materials slide from the bottom surface into one isolation cavity of the material and waste collection trough. When the weight does not meet the preset weight, the first lead screw nut pair drives the distribution plate, so that the materials slide from the bottom surface into another isolation cavity of the material and waste collection trough.

[0018] Compared with the prior art, the present utility model has the following beneficial effects:

[0019] 1. The automatic quantitative feeding device for granular materials provided by the present utility model realizes the automatic mixing, feeding, rechecking and other processes of granular materials through the mutual cooperation of the mixing mechanism, the feeding mechanism and the weight recheck mechanism, without manual operation throughout the process, reducing the labor cost and improving the production efficiency;

[0020] 2. It can realize different feeding qualities and is applicable to different granular material packaging specifications;

[0021] 3. Through the closed-loop weight adjustment control, it is applicable to the quantitative feeding of granular materials with different densities and shapes;

[0022] 4. Through the precise adjustment of the ball screw spline shaft and the high-precision monitoring of the weight recheck mechanism, high-precision quantitative feeding can be realized.

[0023] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0024] Figure 1 is a schematic three-dimensional structure diagram of an embodiment of the present utility model;

[0025] Figure 2 is a schematic cross-sectional structure diagram of the mixing mechanism in an embodiment of the present utility model;

[0026] Figure 3 is a schematic cross-sectional structure diagram of the feeding mechanism in an embodiment of the present utility model;

[0027] Figure 4 is a schematic diagram of the measuring cup blanking structure of the feeding mechanism in an embodiment of the present utility model;

[0028] Figure 5 is Figure 4 side view of;

[0029] Figure 6 is a schematic three-dimensional structure diagram of the feeding mechanism in an embodiment of the present utility model;

[0030] Figure 7 is a schematic cross-sectional structure diagram of the mixing mechanism in an embodiment of the present utility model;

[0031] Figure 8 is a schematic three-dimensional structure diagram of the mixing mechanism in an embodiment of the present utility model;

[0032] In the figure, 1 - mixing mechanism, 2 - feeding mechanism, 3 - weight recheck mechanism, 4 - mixing feed inlet, 5 - driving gear, 6 - driven gear, 7 - right-handed screw, 8 - left-handed screw, 9 - frame, 10 - support sleeve, 11 - mixing discharge outlet, 12 - first spline sleeve, 13 - first expansion sleeve, 14 - second expansion sleeve, 15 - first gear pair, 16 - flange, 17 - first motor, 18 - ball screw spline shaft, 19 - second gear pair, 20 - nut sleeve, 21 - second motor, 22 - second spline sleeve, 23 - limit plate, 24 - second measuring cup, 25 - first measuring cup, 26 - convex block, 27 - disc, 28 - ring, 29 - torsion spring, 30 - discharge elbow, 31 - sensor, 32 - rotating disc, 33 - guiding optical axis, 34 - baffle, 35 - base, 36 - load cell, 37 - weighing hopper, 38 - bin door, 39 - slider, 40 - first lead screw nut pair, 41 - distributing disc, 42 - discharge port, 43 - material and waste collection tank, 44 - second lead screw nut pair; 45 - first mounting plate, 46 - wedge plate, 47 - second mounting plate, 48 - linear bearing, 49 - third mounting plate, 50 - through hole, 51 - fourth mounting plate. Detailed implementation mode

[0033] In order to make the above features and advantages of the present utility model more obvious and understandable, specific embodiments are hereinafter given and described in detail in conjunction with the accompanying drawings.

[0034] The automatic quantitative feeding device for granular materials of the present utility model includes a frame 9, a mixing mechanism 1, a feeding mechanism 2 and a weight recheck mechanism 3 which are sequentially arranged on the frame 9 from top to bottom (indicating that there is a height difference among the mixing mechanism 1, the feeding mechanism 2 and the weight recheck mechanism 3). The feeding mechanism 2 includes a plurality of groups of first measuring cups 25 and second measuring cups 24 with coaxially nested ports, and a lifting and rotating mechanism for driving the first measuring cup and the second measuring cup to rotate synchronously or move relatively away from or close to each other; the first measuring cup 25 and the second measuring cup 24 are in the shape of a cylinder or a square cylinder, and the inner diameter of the first measuring cup 25 is equivalent to the outer diameter of the second measuring cup 24 (transition fit or small clearance fit), so that the granular materials will not overflow from the gap between them, and at the same time, the first measuring cup and the second measuring cup can move axially relative to each other.

[0035] The lifting and rotating mechanism includes a ball screw spline shaft 18, a nut sleeve 20 connected to the ball screw spline shaft 18 and driven to rotate by a second motor 21, a first spline sleeve 12 connected to the ball screw spline shaft 18 and driven to rotate by a first motor 17, and a second spline sleeve 22 connected to the ball screw spline shaft. Driven by the second motor 21, the nut sleeve 20 rotates, and then drives the ball screw spline shaft 18 in the nut sleeve 20 to lift. Driven by the first motor 17, the first spline sleeve 12 rotates, and drives the ball screw spline shaft 18 in the first spline sleeve 12 to rotate, and then drives the second spline sleeve 22 to rotate synchronously;

[0036] The middle upper part of the ball screw spline shaft is fixedly connected with a support sleeve 10 (which can be fixed by interference fit or locked by bolts). The support sleeve 10 is fixedly connected with a grooved rotating disk 32. The support sleeve 10 is fixed at the bottom center position of the rotating disk 32, and the ball screw spline shaft 18 passes through the support sleeve 10 and is relatively fixed.

[0037] A plurality of the first measuring cups 25 are arranged on the groove bottom plate of the rotating disk 32. The second spline sleeve 22 is connected with a limiting plate 23, and a plurality of the second measuring cups 24 are arranged on the limiting plate 23. (In this example, both the first measuring cup 25 and the second measuring cup 24 are six, and the rotation of the second spline sleeve 22 drives the second measuring cup 24 and the first measuring cup 25 to rotate synchronously.

[0038] Specifically, the upper end of the ball screw spline shaft 18 is connected to the first mounting plate 45. In this embodiment, the upper end of the ball screw spline shaft 18 is fixedly sleeved in the inner ring of the bearing, and the outer ring of the bearing is fixedly connected to the first mounting plate 45. A guiding optical shaft 33 is fixedly installed on the side of the first mounting plate (the guiding optical shaft 33 is parallel to the ball screw spline shaft 18 and serves as a guiding function). The guiding optical shaft 33 sequentially passes through a linear bearing 48 installed on the second mounting plate 47 and a through hole 50 located on the third mounting plate 49 from top to bottom. During the lifting and lowering process of the ball screw spline shaft, the guiding optical shaft moves up and down in the linear bearing and the through hole. With the above structure, the ball screw spline shaft 18 and the first mounting plate 45 can rotate relative to each other, and the ball screw spline shaft 18 can drive the first mounting plate 45 to lift and lower. At the same time, the ball screw spline shaft 18 can drive the rotating disk 32 to lift and rotate together (by fixedly connecting the support sleeve 10 to the ball screw spline shaft 18 and the rotating disk 32 respectively). The rotating disk 32 can rotate relative to the first mounting plate 45, but there is no relative axial movement between the two.

[0039] A fourth mounting plate 51 is installed below the third mounting plate 49. A second motor 21 is fixedly installed on the fourth mounting plate 51, and a nut sleeve 20 is rotatably connected thereto. The nut sleeve 20 is axially limited and installed on the fourth mounting plate through a flange plate, so that the nut sleeve can only rotate and cannot move axially. The output shaft of the second motor 21 drives the nut sleeve 20 to rotate through a second gear pair 19. The inner peripheral wall of the nut sleeve is threadedly connected to the outer peripheral wall of the ball screw spline shaft, so as to force the ball screw spline shaft to axially lift and lower when the output shaft of the second motor drives the nut sleeve to rotate through the second gear pair. The output shaft of the second motor and the first gear of the second gear pair, as well as the nut sleeve 20 and the second gear of the second gear pair, are respectively fixed through expansion sleeves. The expansion sleeve is a commonly used component in the mechanical field, which realizes the fastening of two sleeved components. The specific structure and usage method are not described in detail here.

[0040] The first motor 17 is fixedly installed on the third mounting plate 49. The output shaft of the first motor 17 drives the first spline sleeve 12 and the ball screw spline shaft 18 to rotate through a first gear pair 15, and then drives the second spline sleeve 22 rotatably connected to the second mounting plate 47 and the limiting plate 23 fixedly installed on the second spline sleeve to rotate. The first spline sleeve 12 and the second spline sleeve 22 are tube sleeves with spline grooves in their inner holes. They are respectively connected to the mounting plate through a flange, so that they can rotate but cannot move axially. The balls on the ball screw spline shaft 18 are embedded in the spline grooves of the first spline sleeve 12 and the second spline sleeve 22, so that when the first spline sleeve 12 rotates, it can drive the ball screw spline shaft 18 to rotate, and when the ball screw spline shaft 18 rotates, it can drive the second spline sleeve 22 to rotate.

[0041] In addition, the mixing mechanism 1 includes a cylindrical body and two parallel screws (including a left-handed screw 8 and a right-handed screw 7) arranged in the cylindrical body, and gears that mesh with each other are provided on the upper parts of the left-handed screw 8 and the right-handed screw 7, wherein the upper end of the right-handed screw 7 serves as the input end of the motor power, and the upper part of the cylindrical body has a mixing feed port 4 (the mixing feed port 4 can be staggered with the gears and power input shafts of the left-handed screw 8 and the right-handed screw 7), and the lower part of the cylindrical body has a mixing discharge port 11, and the mixing discharge port 11 is opposite to the feed port of the rotating disk 32 so that the mixed material can be introduced into the rotating disk.

[0042] During operation, the motor drives the right-handed screw 7 and the driving gear 5 to rotate, and then the driving gear 5 engages with the driven gear 6. The driven gear 6 rotates in the opposite direction to the driving gear 5, driving the left-handed screw 8 to rotate. That is, the two screws with different rotation directions rotate synchronously to fully stir the material in the cylinder.

[0043] Two baffles 34 are provided in the rotating disk (the baffles 34 are fixed on the frame, and the rotating disk rotates relative to the baffles 34). The two baffles 34 are offset by 90 degrees in the circumferential direction. The mixing discharge port 11 is correspondingly arranged above the two baffles 34 within a range of 270 degrees in the circumferential direction, and the drop port connected to the discharge elbow is located below the two baffles 34 within a range of 90 degrees in the circumferential direction.

[0044] The lower port of the second measuring cup 24 is provided with an opening and closing valve, which specifically includes a ring 28 fixed at the lower end of the second measuring cup and a disc 27 rotatably connected to the ring at the side. A torsion spring 29 is installed on the rotating connecting shaft at the side of the disc and the ring. In the absence of external force, the torsion spring 29 can rotate the disc to the lower port of the second measuring cup and achieve blocking (the structure in which the torsion spring 29 is installed on the connecting shaft and the disc is restored to the prior art is not repeated here). A protrusion 26 capable of pushing the disc laterally is fixedly provided on the third mounting plate. When the second measuring cup 24 and the disc 27 rotate with the limiting plate 23, the disc is pushed by the protrusion, so that the disc rotates around the connecting shaft on the side to be misaligned with the lower port of the second measuring cup, and the materials in the second measuring cup and the first measuring cup fall with gravity. A drop port is provided on the second mounting plate, and a discharge elbow 30 is connected below the drop port, and the outlet end of the discharge elbow leads to the inlet end of the weight re-inspection mechanism 3.

[0045] A sensor 31 is installed on the side of the second mounting plate of the feeding mechanism 2, and the sensor can monitor the rotation angle of the measuring cup.

[0046] Among them, the weight re-inspection mechanism 3 includes a weighing hopper 37 as the feeding end, a material distribution plate 41, and a material and waste collection tank 43. The bottom of the hopper is inclined so that the material can slide into the material distribution plate due to gravity. A weighing sensor 36 is installed on the base 35 below the hopper, and the material in the hopper 37 can be accurately weighed through the weighing sensor 36. A hatch 38 connecting the hopper and the material distribution plate is provided on the side of the hopper. The hatch 38 is driven to move up and down by a second lead screw nut pair 44 located above it. More specifically, the nut of the second lead screw nut pair 44 is fixedly connected to a slider 39, and the lower end of the slider 39 hooks the hatch 38. When the second lead screw nut pair 44 works, it drives the slider 39 and the hatch 38 to move up and down.

[0047] Specifically, the material distribution plate 41 is driven to move axially by a first lead screw nut pair 40 (the axis of the first lead screw nut pair 40 is perpendicular to the axis of the second lead screw nut pair 44). The material distribution plate 41 includes an inclined bottom surface that can be connected to the inclined surface of the hopper bottom. Two wedge-shaped plates 46 are provided on the bottom surface. The first opening of the wedge-shaped plate near the hopper is larger, and the second opening of the wedge-shaped plate near the material and waste collection tank is smaller. The material and waste collection tank has a vertical partition to divide the material and waste collection tank into two isolation chambers. Under the drive of the first lead screw nut pair, the material distribution plate moves axially to selectively introduce the material in the material distribution plate into one of the two isolation chambers.

[0048] When the weight re-inspection mechanism 3 detects a difference between the feeding quality and the target quality, it can drive the up and down linear motion of the ball screw spline shaft 18 of the feeding mechanism 3 through closed-loop control, thereby driving the rotary disk 32 to perform up and down linear motion, so as to adjust the measuring cup volume and reduce the error of the next quantitative feeding.

[0049] Specific working method: Granular materials are evenly mixed in the mixing mechanism 1 and input from the mixing discharge port 11 into the rotating disk 32 of the feeding mechanism 2. A baffle 34 is installed below the first mounting plate. During the process that the rotating disk is driven to rotate simultaneously by the first motor 17 and the second motor 21, the materials in the rotating disk 32 are scraped into and filled in the first measuring cup 25 and the second measuring cup 24. When the second measuring cup 24 and the disk 27 rotate to be pushed by the bump 26, the disk is gradually pushed open, and the fully loaded materials in the first measuring cup 25 and the second measuring cup 24 are guided into the weight recheck mechanism 3 by gravity through the blanking port and the discharge elbow 30. After being weighed in the weight recheck mechanism, when the weight meets the predetermined weight, each mechanism operates as described above to achieve the discharge of materials with accurate weight. When the weighed weight in the weight recheck mechanism does not meet the predetermined weight, the first motor maintains the original rotation speed and direction, and the second motor changes the original rotation speed or direction to drive the ball screw spline shaft, the rotating disk and the first measuring cup to lift, so that the weight of the fully loaded materials in the first measuring cup and the second measuring cup changes until the weight of the materials output to the weight recheck mechanism meets the predetermined weight. Then the second motor resumes the original rotation speed and direction and drives the rotating disk, the limit plate, the first measuring cup and the second measuring cup to rotate simultaneously with the first motor.

[0050] The transmission chain where the first motor is located is a spline drive. When the first motor operates alone, the rotating disk makes a helical motion; the transmission chain where the second motor is located is a nut drive. When the second motor operates alone, the rotating disk makes a linear motion. If the motor direction is specified: looking at the end face of the motor shaft, counterclockwise rotation is positive rotation and clockwise rotation is reverse rotation. When the rotation speeds of the first motor and the second motor are equal and the rotation directions are opposite, the rotating disk makes a pure rotation motion; it can also be intuitively understood that when the nut sleeve and the first spline sleeve make rotation motions with equal magnitudes and the same direction, the rotating disk makes a pure rotation.

[0051] When the first motor works, the second motor rotates in the opposite direction at a constant speed so that the ball screw spline shaft only rotates without lifting motion. When the second motor works, the first motor stops working to achieve that the ball screw spline shaft only lifts without rotating motion. After the materials are weighed in the weighing hopper of the weight recheck mechanism, the second lead screw nut pair 44 drives the bin door 38 to open, allowing the materials to slide into the distribution tray from the inclined plane at the bottom of the trough. When the weight meets the preset weight, the first lead screw nut pair 40 drives the distribution tray 41 to make the materials slide from the bottom into an isolation cavity of the material and waste collection trough (a funnel can be provided at the bottom of this isolation cavity, and a packaging bag or the like can be provided below the funnel). When the weight does not meet the preset weight, the first lead screw nut pair drives the distribution tray to make the materials slide from the bottom into another isolation cavity of the material and waste collection trough (for unified collection and then returned to the mixing mechanism later).

[0052] For any of the technical solutions disclosed by the present utility model, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only the numerical value with obvious technical effects or representativeness among many implementable numerical values. Since there are too many numerical values to enumerate, the present utility model only discloses some numerical values to illustrate the technical solution of the present utility model. Moreover, the listed numerical values should not constitute a limitation to the protection scope of the present utility model.

[0053] If terms such as "first" and "second" are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of distinguishing components in description. Unless otherwise stated, the above terms have no special meaning.

[0054] Meanwhile, for the present utility model, if it discloses or involves components or structural parts that are fixedly connected to each other, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), or it can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the components fixedly connected to each other can also be replaced by an integral structure (for example, manufactured by integral casting process) (except when it is obviously impossible to adopt the integral forming process).

[0055] In addition, for any of the technical solutions disclosed by the present utility model, the terms used to represent the positional relationship or shape, unless otherwise stated, include the states or shapes similar, analogous or close to it.

[0056] Any component provided by the present utility model can either be assembled from multiple separate components or be a single component manufactured by integral forming process.

[0057] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present utility model or perform equivalent substitution on some technical features; without departing from the spirit of the technical solutions of the present utility model, they should all be covered within the scope of the technical solutions claimed by the present utility model.

Claims

1. An automatic quantitative feeding device for granular materials, characterized in that: The invention comprises a frame (9), a mixing mechanism (1), a feeding mechanism (2) and a weight rechecking mechanism (3) which are arranged on the frame (9) in order from top to bottom, wherein the feeding mechanism (2) comprises a plurality of groups of first measuring cups (25) and second measuring cups (24) whose ports are coaxially nested with each other, and a lifting and rotating mechanism which drives the first measuring cup and the second measuring cup to rotate synchronously or to move away from each other or to move closer to each other; The lifting and rotating mechanism comprises a ball screw spline shaft (18), a nut sleeve (20) connected to the ball screw spline shaft (18) and driven to rotate by a second motor (21), a first spline sleeve (12) connected to the ball screw spline shaft (18) and driven to rotate by a first motor (17), and a second spline sleeve (22) connected to the ball screw spline shaft; the nut sleeve (20) rotates under the drive of the second motor (21), thereby driving the ball screw spline shaft (18) in the nut sleeve (20) to rise and fall; the first spline sleeve (12) rotates under the drive of the first motor (17), thereby driving the ball screw spline shaft (18) in the first spline sleeve (12) to rotate, thereby driving the second spline sleeve (22) to rotate synchronously; The middle and upper part of the ball screw spline shaft is fixedly connected to a support sleeve (10), a groove-shaped rotating disk (32) is fixedly connected to the support sleeve (10), a plurality of the first measuring cups (25) are inserted on the groove bottom plate of the rotating disk (32), the second spline sleeve (22) is connected to a limit plate (23), a plurality of the second measuring cups (24) are inserted on the limit plate (23), and the rotation of the second spline sleeve (22) drives the second measuring cups (24) and the first measuring cups (25) to rotate synchronously.

2. The automatic quantitative feeding device for granular materials according to claim 1 is characterized in that: The mixing mechanism (1) comprises a cylindrical body and two parallel screws arranged in the cylindrical body, the upper part of the cylindrical body has a mixing inlet (4), the lower part of the cylindrical body has a mixing outlet (11), and the mixing outlet (11) is opposite to the inlet of the rotating disk (32) so that the mixed materials can be introduced into the rotating disk.

3. The automatic quantitative feeding device for granular materials according to claim 1 or 2, characterized in that: The upper end of the ball screw spline shaft (18) is connected to a first mounting plate (45), and a guide light shaft (33) is fixedly mounted on the side of the first mounting plate. The guide light shaft (33) passes through a linear bearing (48) mounted on a second mounting plate (47) and a through hole (50) located on a third mounting plate (49) in sequence from top to bottom. During the lifting and lowering process of the ball screw spline shaft, the guide light shaft is lifted and lowered in the linear bearing and the through hole.

4. The automatic quantitative feeding device for granular materials according to claim 3 is characterized in that: A fourth mounting plate (51) is mounted below the third mounting plate (49), the second motor (21) being fixedly mounted on the fourth mounting plate (51) and being rotatably connected to the nut sleeve (20), the nut sleeve being axially limited on the fourth mounting plate so that the nut sleeve can only rotate but cannot move axially, the output shaft of the second motor (21) drives the nut sleeve (20) to rotate via the second gear pair (19), the inner peripheral wall of the nut sleeve being threadedly connected to the outer peripheral wall of the ball screw spline shaft, so that the output shaft of the second motor drives the nut sleeve to rotate via the second gear pair and forces the ball screw spline shaft to rise and fall axially.

5. The automatic quantitative feeding device for granular materials according to claim 4 is characterized in that: The first motor (17) is fixedly mounted on the third mounting plate (49), and the output shaft of the first motor (17) drives the first spline sleeve and the ball screw spline shaft to rotate via the first gear pair (15), thereby driving the second spline sleeve (22) connected to the second mounting plate (47) and the limit plate (23) fixedly mounted on the second spline sleeve to rotate.

6. The automatic quantitative feeding device for granular materials according to claim 5 is characterized in that: The lower end of the second measuring cup (24) is provided with an opening and closing valve, the opening and closing valve comprising a ring (28) fixed at the lower end of the second measuring cup and a disc (27) rotatably connected to the ring at the side, a torsion spring (29) being installed on the rotatably connected shaft at the side of the disc and the ring so that the disc can rotate to the lower end of the second measuring cup and achieve blocking, a protrusion (26) capable of pushing the disc laterally is fixedly provided on the third mounting plate, when the second measuring cup and the disc rotate with the limit plate, the disc is pushed by the protrusion so that the disc rotates around the connecting shaft at the side to be misaligned with the lower end of the second measuring cup, and the materials in the second measuring cup and the first measuring cup fall down with gravity, a material drop opening is provided on the second mounting plate, a material discharge elbow is connected below the material drop opening, and the outlet end of the material discharge elbow leads to the inlet end of the weight rechecking mechanism (3).

7. The automatic quantitative feeding device for granular materials according to claim 6 is characterized in that: The weight rechecking mechanism (3) comprises a weighing bucket (37) as a material feeding end, a material distribution plate (41) and a material and waste collection trough (43). The bottom of the trough of the weighing bucket is an inclined surface so that the material can slide into the material distribution plate due to gravity. A weighing sensor (36) mounted on a base (35) is provided below the weighing bucket. A chamber door (38) connecting the weighing bucket and the material distribution plate is provided on the side of the weighing bucket. The chamber door (38) is driven to rise and fall by a second screw nut pair (44) located above the chamber door.

8. The automatic quantitative feeding device for granular materials according to claim 7 is characterized in that: The material distribution plate (41) is driven by the first screw nut pair (40) to move axially. The material distribution plate (41) comprises an inclined bottom surface capable of being connected with the inclined surface of the bottom of the weighing bucket groove. Two wedge plates (46) are provided on the bottom surface. The first opening of the wedge plate close to the weighing bucket is larger, and the second opening of the wedge plate close to the material and waste collection groove (43) is smaller. The material and waste collection groove (43) is provided with a vertical partition plate to divide the material and waste collection groove into two isolation chambers. The material distribution plate moves axially under the drive of the first screw nut pair to selectively guide the material in the material distribution plate into one of the two isolation chambers.

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