Vertical spiral fine feeding device

Abstract

The present invention discloses a vertical spiral fine feeding device, comprising a bracket, a discharging hopper fixed on the bracket, a discharging port arranged at the bottom of the discharging hopper, a first feeding shaft rotatably arranged in the discharging hopper, the outer diameter of the first feeding shaft is adapted to the inner diameter of the discharging section of the discharging hopper, a spiral groove connected to the discharging port is arranged on the outer diameter of the first feeding shaft, and an opening for raw materials to pass through is arranged on the side wall of the first feeding shaft; a second feeding shaft is movably sleeved in the first feeding shaft, the length of the second feeding shaft is greater than the length of the first feeding shaft, a groove is arranged at the bottom end of the second feeding shaft, the groove is concave toward the center of the second feeding shaft, and the groove is connected to the discharging port; a feed hopper is also arranged on the discharging hopper, and the feed hopper is connected to the feed section of the discharging hopper. The present invention can realize fine feeding by controlling the discharge amount, shortening the exposure time of raw materials in the environment; it is suitable for industries such as industry and biomedicine, and is used for fine feeding into vessels or containers.

Description

Technical Field

[0001] The invention relates to a feeding device, in particular to a vertical spiral fine feeding device. Background Art

[0002] During the experimental operation, it is necessary to weigh multiple samples and then mix them to study the reaction effect under synergistic action. For example, in the development of drug formulas, it is necessary to weigh each drug according to the prescription requirements in the drug manual. Since some drug particles are expensive and may cause particle contamination due to long-term exposure to the environment, the conventional sampling method of taking samples with a medicine spoon and placing them on the scale cannot be selected.

[0003] The patent with publication number CN221244747U discloses a ketoprofen pharmaceutical dispensing tank, including a feed hopper, a conveying frame, a first drive motor, and a propulsion paddle. The feed hopper is connected to the conveying frame, the propulsion paddle is spiral and arranged inside the conveying frame, and the propulsion paddle is connected to the first drive motor arranged outside the conveying frame. When in use, the raw material falls from the feed hopper into the conveying frame, and the first drive motor drives the propulsion paddle to rotate to push the raw material forward, and finally the raw material is put into the container on the weight scale. The raw materials in this structure are transported in the conveying frame, avoiding the problem of dust in the air contaminating the raw materials.

[0004] However, the sampling weight specified during sampling may be a non-integer, such as 50.8 g. The above-mentioned patent cannot control the amount of raw materials output from the end of the conveying frame when discharging the materials. When too much material is discharged, the second telescopic rod drives the two half-bowls to open and close to take away the excess raw materials in the container. This method undoubtedly increases the exposure time of the raw materials in the environment. Summary of the invention

[0005] In order to solve the above deficiencies in the prior art, the present invention aims to provide a vertical spiral fine feeding device to achieve fine feeding by controlling the discharge amount, thereby shortening the exposure time of raw materials in the environment during the weighing process.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A vertical spiral fine feeding device comprises a bracket and a discharging hopper fixed on the bracket, a discharging port is arranged at the bottom of the discharging hopper, a first feeding shaft is rotatably arranged in the discharging hopper, a rotation axis of the first feeding shaft is along its central axis, an outer diameter of the first feeding shaft is matched with an inner diameter of a discharging section of the discharging hopper, a spiral groove is arranged on the outer diameter of the first feeding shaft, the bottom of the spiral groove is connected with the discharging port, the first feeding shaft is hollow inside, and an opening for raw materials to pass through is arranged on its side wall;

[0008] A second feeding shaft is movably sleeved inside the first feeding shaft, the outer diameter of the second feeding shaft is adapted to the inner diameter of the first feeding shaft, the length of the second feeding shaft is greater than the length of the first feeding shaft, and a groove for the raw material to pass between the second feeding shaft and the first feeding shaft is provided at one end of the second feeding shaft close to the discharge port, the groove is recessed toward the center of the second feeding shaft, and the groove is connected to the discharge port;

[0009] A feed hopper is also arranged on the discharge hopper, and the feed hopper is communicated with the feed section of the discharge hopper.

[0010] As a limitation of the present invention: the second feeding shaft makes linear motion along the axial direction of the first feeding shaft; a limit plate is fixedly sleeved on the end of the second feeding shaft away from the groove, a spring is arranged between the limit plate and the first feeding shaft, the spring is sleeved on the outer diameter of the second feeding shaft, the spring is extended and retracted along the axial direction of the second feeding shaft, and the spring and the limit plate, as well as the spring and the first feeding shaft are all fixedly connected.

[0011] As a further limitation of the present invention: a plurality of stop blocks are arranged on the outer diameter of the second feeding shaft along its axial direction, the stop blocks are arranged obliquely on the second feeding shaft and extend toward the discharge port, and a gap is left between the stop blocks and the inner wall of the first feeding shaft.

[0012] As another limitation of the present invention: the second feeding shaft is rotatably arranged in the first feeding shaft; the rotation axis of the second feeding shaft is parallel to the rotation axis of the first feeding shaft, and a spiral groove is also arranged on the second feeding shaft, and the bottom of the spiral groove is connected to the groove.

[0013] As another limitation of the present invention: there are multiple openings, which are spaced apart along the circumference of the first feeding shaft, and a push plate is provided at the opening, which extends in a direction away from the axis of the first feeding shaft, and the angle between the push plate and the opening is an acute angle.

[0014] As a further limitation of the present invention: a support frame and a bearing are arranged between the first feeding shaft and the discharge hopper, the inner ring of the bearing is sleeved on the outer diameter of the first feeding shaft, and the outer ring of the bearing and the support frame, as well as the support frame and the inner wall of the discharge hopper are fixedly connected.

[0015] As a further limitation of the present invention: a cushion block is sleeved on the outer ring of the bearing. The cushion block is a split structure, including two gaskets with arc-shaped inner walls. The openings of the two gaskets are opposite to each other, and the cushion block is fixedly connected to the support frame.

[0016] As another limitation of the present invention: a driving assembly for driving the first feeding shaft to rotate is arranged in the discharge hopper, the driving assembly includes a motor and a transmission mechanism, the output end of the motor is connected to the input end of the transmission mechanism, and the output end of the transmission mechanism is connected to the first feeding shaft.

[0017] As a further limitation of the present invention: the transmission mechanism includes a belt, the belt input end is sleeved on the motor output end, and the belt output end is sleeved on the outer diameter of the first feeding shaft.

[0018] As a further limitation of the present invention: a cover body is fixed on the discharge hopper, a motor is fixed on the inner wall of the cover body, a feed hopper is fixed on the cover body and passes through the top wall of the cover body, an end of the second feeding shaft away from the discharge port extends from the cover body, and the second feeding shaft is movably connected to the cover body.

[0019] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0020] (1) The present invention includes a bracket, a discharge hopper, a first feed shaft and a second feed shaft. The first feed shaft is rotatably arranged in the discharge hopper. A spiral groove is arranged on the outer diameter of the first feed shaft. When rotating, the raw material is pushed downward for transportation, and then output to a container located below the discharge port through a discharge port. The second feed shaft is movably sleeved in the first feed shaft. The raw material enters the first feed shaft through an opening and is filled between the second feed shaft and the first feed shaft. When fine feeding is required, the second feed shaft is lifted upward, and the raw material falls from the groove position. Since the size of the groove is small, the amount of material discharged at one time is also small. The discharge amount can be easily controlled by observing the reading on the balance, thus avoiding the problem in the prior art that the discharge amount is too large and the excess raw material needs to be taken away, resulting in the raw material being exposed to the environment for too long;

[0021] (2) The push plate provided on the first feeding shaft extends in a direction away from the axis of the first feeding shaft, and the angle α between the push plate and the opening is an acute angle. When the raw material falls into the discharge hopper, the first feeding shaft rotates, and the push plate can help push the raw material into the spiral groove and the opening;

[0022] (3) A plurality of stop blocks are arranged along the axial direction on the outer diameter of the second feeding shaft. The stop blocks are arranged obliquely on the second feeding shaft and extend toward the discharge port. The existence of the stop blocks can prevent all the raw materials from accumulating at the bottom. When the second feeding shaft is moved upward, this structure further reduces the amount of raw materials falling from the groove, avoids too much material being discharged at one time, and facilitates fine material discharge.

[0023] In summary, the present invention can achieve fine material dispensing by controlling the material dispensing amount, thereby shortening the exposure time of the raw materials in the environment; the present invention is suitable for industries such as industry and biomedicine, and is used for fine material dispensing into vessels or containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of Example 1 of the present invention;

[0026] Figure 2 It is an exploded view of embodiment 1 of the present invention;

[0027] Figure 3 Schematic diagram of the three-dimensional structure of the bracket in Example 1 of the present invention;

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the discharge hopper in Example 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the main structure of the discharge hopper in Example 1 of the present invention;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the first feeding shaft in Example 1 of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the opening on the first feeding shaft and the push plate in Example 1 of the present invention;

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the second feeding shaft, the spring and the limit plate in Example 1 of the present invention;

[0033] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second feeding shaft in Example 1 of the present invention;

[0034] Fig.10 This is a schematic diagram of the structure of the bottom of the discharge hopper and the second feeding shaft in Example 1 of the present invention;

[0035] Fig.11 for Fig.10 A magnified schematic diagram of part A;

[0036] Fig.12 It is a cross-sectional view of the discharge hopper, the first feeding shaft, and the second feeding shaft in Example 1 of the present invention;

[0037] Fig.13 for Fig.12 A magnified schematic diagram of part B;

[0038] Fig.14 It is a schematic diagram of the structure of the discharge hopper, the first feeding shaft, the second feeding shaft, the support frame, the gasket and the driving assembly in Example 1 of the present invention;

[0039] Fig.15 It is a schematic diagram of the structure of the discharge hopper, the first feeding shaft, the support frame and the gasket in Example 1 of the present invention;

[0040] Fig.16 It is a schematic diagram of the structure of the groove, the first feeding shaft and the discharge hopper after the second feeding shaft in Example 1 of the present invention moves upward;

[0041] Fig.17 This is a schematic diagram of the main structure of the second feeding shaft in Example 2 of the present invention.

[0042] In the figure: 1- bracket, 101- leg, 102- tray;

[0043] 2-discharging hopper, 21-discharging port, 211-first discharging port, 212-second discharging port, 22-feeding section, 221-cylindrical area, 222-transition area, 23-discharging section;

[0044] 3-first feeding shaft, 31-spiral groove, 32-opening, 33-push plate;

[0045] 4-second feeding shaft, 41-groove, 42-stop block;

[0046] 5-feed hopper, 6-limiting plate, 7-spring, 8-support frame, 9-bearing, 10-gasket, 11-motor, 12-belt;

[0047] 13-cover body, 131-first cover body, 132-second cover body. DETAILED DESCRIPTION

[0048] The preferred embodiment of the present invention is described below in conjunction with the accompanying drawings. It should be understood that the vertical spiral fine feeding device described here is a preferred embodiment, which is only used to illustrate and explain the present invention and does not constitute a limitation of the present invention.

[0049] The directional words or positional relationships such as "upper" and "lower" described in the embodiments are based on the human body's position when using the embodiments and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the content protected by the invention.

[0050] Example 1

[0051] like Figures 1 to 16 As shown, this embodiment includes a bracket 1, a discharge hopper 2 fixed on the bracket 1, a first feed shaft 3 is rotatably arranged in the discharge hopper 2, and a spiral groove 31 is arranged on the outer diameter of the first feed shaft 3; the raw material enters the discharge hopper 2 from the feed hopper 5 and falls into the spiral groove 31 on the first feed shaft 3. As the first feed shaft 3 rotates, the raw material is pushed downward and then output to the container below the discharge port 21 through the discharge port 21. A second feed shaft 4 is movably sleeved in the first feed shaft 3, and the second feed shaft 4 is used to achieve fine feeding. A groove 41 is arranged at the bottom of the second feed shaft 4. When feeding, the raw material enters the first feed shaft 3 through the opening 32 and fills between the inner wall of the first feed shaft 3 and the second feed shaft 4. When the second feed shaft 4 is lifted upward, the groove 41 moves upward, and the raw material can pass between the groove 41 and the first feed shaft 3. Since the size of the groove 41 is small, the raw material in the groove 41 is also small, and the discharge amount is also small, so fine feeding is achieved.

[0052] 1. Bracket 1;

[0053] like Figure 1 , 3 As shown, the bracket 1 includes legs 101 and a tray 102 fixed on the legs 101. In this embodiment, there are three legs 101, and the tray 102 is in the shape of an inverted frustum as a whole, which is convenient for fitting the discharge hopper 2 to support the discharge hopper 2 more stably.

[0054] 2. Discharging hopper 2;

[0055] like Figure 4 , 5 As shown, the discharge hopper 2 includes a feed section 22 and a discharge section 23. The feed section 22 includes a cylindrical area 221 and a transition area 222. The transition area 222 is in the shape of an inverted truncated cone so that the raw material can automatically slide downward in the discharge hopper 2. Figure 1 , 3 As shown, when the discharge hopper 2 is fixed on the bracket 1, the tray 102 supports the transition zone 222, the discharge section 23 is located below the tray 102, and the feed section 22 is located above the tray 102. In this embodiment, the discharge section 23 is a cylindrical structure, and the bottom is a ball head structure, and the discharge port 21 is arranged at the bottom of the discharge hopper 2, that is, at the position of the ball head. The discharge port 21 includes a first discharge port 211 and a second discharge port 212. In this embodiment, three fan-shaped holes are arranged at intervals at the ball head position, namely the first discharge port 211; a circular hole is arranged at the center of the ball head position, namely the second discharge port 212. The raw materials on the first feeding shaft 3 are output from the first discharge port 211, and the raw materials on the second feeding shaft 4 are output from the first discharge port 211 and the second discharge port 212.

[0056] 3. The first feeding shaft 3;

[0057] like Figure 2 , 6 As shown in FIG. 7 , the first feeding shaft 3 is rotatably disposed in the discharge hopper 2, and a spiral groove 31 is disposed on the outer diameter of the lower half of the first feeding shaft 3, and the bottom of the spiral groove 31 is connected to the first discharge port 211 to realize spiral feeding. Figure 4 , 12 As shown, the outer diameter of the first feeding shaft 3 is matched with the inner diameter of the discharge section 23 of the discharge hopper 2. Matching here means that the outer diameter of the first feeding shaft 3 is equal to the inner diameter of the discharge section 23 of the discharge hopper 2. When the first feeding shaft 3 does not rotate, the raw material will not fall; when the first feeding shaft 3 rotates, the raw material in the spiral groove 31 is pushed downward and then output through the first discharge port 211.

[0058] In this embodiment, a driving assembly is provided to drive the first feeding shaft 3 to rotate. Specifically, Fig.14As shown, the driving assembly includes a motor 11 and a transmission mechanism. In this embodiment, the transmission mechanism is a belt drive, and the transmission mechanism includes a belt 12. The input end of the belt 12 is sleeved on the output end of the motor 11, and the output end of the belt 12 is sleeved on the outer diameter of the first feeding shaft 3. When in use, the motor 11 drives the belt 12 to drive, and the belt 12 drives the first feeding shaft 3 to rotate, and the rotation axis of the first feeding shaft 3 is its central axis.

[0059] In this embodiment, the transmission mechanism can also be set as a gear transmission, including a driving gear fixed to the output end of the motor 11 and a driven gear meshing with the driving gear. The driven gear is fixedly sleeved on the outer diameter of the first feeding shaft 3. As long as the output end of the motor 11 is connected to the input end of the transmission mechanism, the output end of the transmission mechanism is connected to the first feeding shaft 3.

[0060] Further, such as Figure 2 , 14 As shown in Figures 1 and 15, a support frame 8 and a bearing 9 are provided between the first feed shaft 3 and the discharge hopper 2. The inner ring of the bearing 9 is sleeved on the outer diameter of the first feed shaft 3. The outer ring of the bearing 9 and the support frame 8, as well as the support frame 8 and the inner wall of the discharge hopper 2 are all fixedly connected. In order to improve this embodiment, a cushion block is provided between the outer ring of the bearing 9 and the support frame 8. The cushion block is a split structure, including two gaskets 10 with arc-shaped inner walls. The openings of the two gaskets 10 are opposite to each other. The outer ring of the bearing 9 is fixedly connected to the inner wall of the gasket 10. The support frame 8 is provided at the bottom of the gasket 10 and is fixedly connected to the gasket 10.

[0061] 4. The second feeding shaft 4;

[0062] The second feeding shaft 4 is used to achieve fine feeding, such as Figure 6 , 12 As shown, the first feeding shaft 3 is hollow inside, and the second feeding shaft 4 is movably sleeved inside the first feeding shaft 3, so that the raw material can enter the first feeding shaft 3 and then be discharged through the second feeding shaft 4, as shown in FIG. Figure 6 , 7 As shown, the side wall of the first feed shaft 3 is provided with an opening 32 for the raw material to pass through. In this embodiment, there are three openings 32, which can also be set to two, four or other numbers as needed. The three openings 32 are arranged at intervals along the circumference of the first feed shaft 3. A push plate 33 is provided at each opening 32, and the push plate 33 extends in a direction away from the axis of the first feed shaft 3, and the angle α between the push plate 33 and the opening 32 is an acute angle. When the raw material falls into the discharge hopper 2 and the first feed shaft 3 rotates, the push plate 33 can help push the raw material into the spiral groove 31 and the opening 32.

[0063] like Figure 6 , 12As shown, the bottom of the first feeding shaft 3 is also a ball head structure, and the outer diameter of the second feeding shaft 4 is adapted to the inner diameter of the first feeding shaft 3. Adaptation here means that the outer diameter of the second feeding shaft 4 is smaller than the inner diameter of the main body of the first feeding shaft 3. The main body here is relative to the bottom of the ball head, which refers to the position above the bottom of the ball head and is equal to the inner diameter of the ball head position of the first feeding shaft 3, see Figure 8 , 12 The bottom end of the second feeding shaft 4 is provided with a groove 41 for the raw material to pass through between the second feeding shaft 4 and the first feeding shaft 3. The groove 41 is recessed toward the center of the second feeding shaft 4 and passes through the bottom of the second feeding shaft 4. The groove 41 is connected to the second discharge port 212. Fig.10 , 11 In this embodiment, the number of grooves 41 is set to three, which are arranged at equal intervals along the circumference of the second feeding shaft 4. The length of the second feeding shaft 4 is greater than the length of the first feeding shaft 3, so that the bottom end of the second feeding shaft 4 passes through the bottom end of the first feeding shaft 3 and abuts against the bottom of the discharge hopper 2, and the top end of the second feeding shaft 4 passes through the top end of the first feeding shaft 3.

[0064] The second feeding shaft 4 makes a linear motion along the axial direction of the first feeding shaft 3 to achieve fine material feeding. The specific means for the second feeding shaft 4 to make a linear motion are as follows: Figure 8 , 14 As shown, a limit plate 6 is fixedly sleeved on the top of the second feed shaft 4, a spring 7 is arranged between the limit plate 6 and the first feed shaft 3, the spring 7 is sleeved on the outer diameter of the second feed shaft 4, the spring 7 and the limit plate 6, the spring 7 and the first feed shaft 3 are fixedly connected, when the second feed shaft 4 moves up and down, the spring 7 expands and contracts along the axial direction of the second feed shaft 4. Fig.16 As shown, when the second feeding shaft 4 moves upward to the position where the groove 41 corresponds to the ball head of the first feeding shaft 3, the raw material can fall from the groove 41 and then be discharged through the first discharge port 211 and the second discharge port 212. Since the groove 41 is small in size, the raw material falling through the groove 41 is also small, so the amount of material discharged at one time is small, and the purpose of fine material discharge is achieved by controlling the discharge amount.

[0065] In order to improve this embodiment, Figure 8 , 9 As shown, a plurality of stoppers 42 are arranged on the outer diameter of the second feed shaft 4 along its axial direction. In this embodiment, the main body of the second feed shaft 4 includes a thin rod and a thick rod. Here, the thick rod and the thin rod are based on the view. The second feed shaft 4 has a larger diameter at the upper position, which is a thick rod, and a smaller diameter at the lower position, which is a thin rod. Fig.12 As shown, the outer diameter of the thick rod portion is slightly smaller than the inner diameter of the first feed shaft 3, so that the second feed shaft 4 can move up and down; the stopper 42 is arranged obliquely on the thin rod and extends toward the discharge port 21. From the longitudinal section, as shown in FIG. Fig.12 , 13As shown, the stopper block 42 and the surface of the second feed shaft 4 form a parallelogram, and the angle β between the bottom side of the parallelogram and the second feed shaft 4 is an acute angle. Fig.12 As shown, there is still a gap between the stopper block 42 and the inner wall of the first feed shaft 3. When the raw material enters the first feed shaft 3, it is dispersed in the gap between the first feed shaft 3 and the second feed shaft 4. The existence of the stopper block 42 can prevent all the raw materials from accumulating at the bottom, avoiding too much material being discharged at one time. When the second feed shaft 4 is moved upward, this structure further reduces the amount of raw materials falling from the groove 41, making it easier to achieve fine material discharge.

[0066] 5. Cover 13;

[0067] like Figure 1 As shown, a cover 13 is fixed on the discharge hopper 2. In this embodiment, the cover 13 includes a first cover 131 and a second cover 132. The first cover 131 is fixed on the top of the discharge hopper 2 with its opening facing downward. In this embodiment, the two are fixed by threads. The second cover 132 is a cylindrical structure, covering the position of the spring 7 on the second feeding shaft 4. The second feeding shaft 4 extends from the top of the second cover 132. The second feeding shaft 4 is movably connected to the cover 13. The movably connected here means that the inner diameter of the second cover 132 is equal to or slightly larger than the outer diameter of the limit plate 6, so that the limit plate 6 and the upper end of the second feeding shaft 4 can move up and down relative to the second cover 132. The motor 11 is fixed on the inner wall of the first cover 131, and the motor 11 and the belt 12 are located between the first cover 131 and the discharge hopper 2.

[0068] like Figure 1 As shown, in this embodiment, the feed hopper 5 is fixed on the first cover body 131 and penetrates the top wall of the first cover body 131. The feed hopper 5 is connected with the feed section 22 of the discharge hopper 2, so that the raw materials fall into the feed section 22 after being fed through the feed hopper 5 and wait for unloading. Of course, the position of the feed hopper 5 can also be set on the side wall of the first cover body 131 or the side wall of the discharge hopper 2, as long as unloading can be achieved.

[0069] When using this embodiment, the balance and the container are placed directly below the discharge port 21 of the device. The raw material is fed from the feed hopper 5 and falls into the feed section 22 and the spiral groove 31 of the discharge hopper 2. Since the outer diameter of the first feed shaft 3 is equal to the inner diameter of the discharge section 23 of the discharge hopper 2, when the first feed shaft 3 is not rotating, the raw material will not fall between the first feed shaft 3 and the discharge section 23 of the discharge hopper 2. Fig.12 .

[0070] When unloading, the motor 11 drives the first feeding shaft 3 to rotate, and the raw material in the spiral groove 31 on the first feeding shaft 3 is pushed downward and transported, and unloaded through the first discharge port 211. The opening 32 on the first feeding shaft 3 allows the raw material to enter the first feeding shaft 3, and fine unloading is achieved through the second feeding shaft 4. The push plate 33 on the first feeding shaft 3 can play a role in pushing the material. When the first feeding shaft 3 rotates, the push plate 33 rotates accordingly, and the push plate 33 can push the raw material into the spiral groove 31 and the opening 32.

[0071] In the normal state, as shown in FIG. 12 , the outer wall of the thin rod of the second feeding shaft 4 contacts the ball head position of the first feeding shaft 3, and the second feeding shaft 4 does not discharge the material. When the material needs to be discharged, the second feeding shaft 4 is lifted upward, as shown in FIG. Fig.16 As shown, when the groove 41 corresponds to the ball head position of the first feeding shaft 3, the raw material can fall from the groove 41 and then be discharged through the first discharge port 211 and the second discharge port 212. It should be noted that, Figure 4 , 10 As shown in FIGS. 11 and 12 , the bottom of the discharge hopper 2 is a hollow structure, the bottom end of the second feeding shaft 4 is against the bottom of the discharge hopper 2 , and a certain distance is left between the first feeding shaft 3 and the bottom of the discharge hopper 2 .

[0072] The feeding amount of the first feeding shaft 3 is greater than that of the second feeding shaft 4. In actual application, if 50.8g of material is required, 50g of it will be fed through the first feeding shaft 3, and the remaining 0.8g will be finely fed through the second feeding shaft 4. During fine feeding, the first feeding shaft 3 will no longer rotate. Since the feeding amount of the second feeding shaft 4 is very small each time, by observing the value of the balance under the bracket 1, when the value reaches 0.8g, the second feeding shaft 4 is released, and under the action of the spring 7, the second feeding shaft 4 moves downward and returns to Fig.12 In this embodiment, the material is finely discharged by controlling the discharge amount, so as to avoid the raw materials being exposed to the environment for too long and being contaminated during the weighing process.

[0073] Example 2

[0074] The structure of this embodiment is basically the same as that of embodiment 1, except that:

[0075] 1. The means by which the second feed shaft 4 is movably sleeved inside the first feed shaft is that the second feed shaft 4 is rotatably arranged inside the first feed shaft. Specifically, the second feed shaft 4 and the first feed shaft are rotatably connected via a bearing, that is, the inner ring of the bearing is sleeved on the outer diameter of the second feed shaft 4, and the outer ring of the bearing is fixedly connected to the first feed shaft. Since this method is a prior art, it will not be described in this embodiment. Of course, any structure in the prior art can also be used, as long as the second feed shaft 4 can be rotated relative to the first feed shaft.

[0076] 2. If Fig.17As shown, the second feed shaft 4 is also provided with a spiral groove, and only one groove 41 is provided at the bottom of the second feed shaft 4, and the end of the spiral groove is connected to the groove 41, and the rotation axis of the second feed shaft 4 is parallel to the rotation axis of the first feed shaft. The setting method of the spiral groove on the second feed shaft 4 is the same as that of the first feed shaft, and will not be described in detail here. The structure other than this is exactly the same as that of Example 1, and will not be described in detail in this embodiment.

[0077] The use process of this embodiment is similar to that of Embodiment 1, except that when fine material feeding is required, the second feeding shaft 4 is rotated, the material is transported downward by the spiral groove on the second feeding shaft 4, and finally the raw material is output through the groove 41; when the second feeding shaft 4 is not rotated, the raw material will not fall.

[0078] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vertical spiral fine feeding device, characterized in that: It includes a bracket and a discharging hopper fixed on the bracket, a discharging port is arranged at the bottom of the discharging hopper, a first feeding shaft is rotatably arranged in the discharging hopper, the rotation axis of the first feeding shaft is the central axis thereof, the outer diameter of the first feeding shaft is equal to the inner diameter of the discharging section of the discharging hopper, a spiral groove is arranged on the outer diameter of the first feeding shaft, the bottom of the spiral groove is connected with the discharging port, the first feeding shaft is hollow inside, and an opening for raw materials to pass through is arranged on its side wall; A second feeding shaft is movably sleeved inside the first feeding shaft, the outer diameter of the second feeding shaft is smaller than the inner diameter of the first feeding shaft, the length of the second feeding shaft is greater than the length of the first feeding shaft, and a groove for raw materials to pass between the second feeding shaft and the first feeding shaft is provided at one end of the second feeding shaft close to the discharge port, the groove is recessed toward the center of the second feeding shaft, and the groove is connected to the discharge port; A feed hopper is also arranged on the discharge hopper, and the feed hopper is communicated with the feed section of the discharge hopper.

2. The vertical spiral fine feeding device according to claim 1 is characterized in that: The second feeding shaft makes a linear motion along the axial direction of the first feeding shaft; a limit plate is fixedly sleeved on one end of the second feeding shaft away from the groove, a spring is arranged between the limit plate and the first feeding shaft, the spring is sleeved on the outer diameter of the second feeding shaft, the spring is extended and retracted along the axial direction of the second feeding shaft, and the spring and the limit plate, as well as the spring and the first feeding shaft are all fixedly connected.

3. The vertical spiral fine feeding device according to claim 2 is characterized in that: A plurality of stop blocks are arranged on the outer diameter of the second feeding shaft along its axial direction. The stop blocks are arranged obliquely on the second feeding shaft and extend toward the discharge port. A gap is left between the stop blocks and the inner wall of the first feeding shaft.

4. The vertical spiral fine feeding device according to claim 1 is characterized in that: The second feeding shaft is rotatably arranged in the first feeding shaft; the rotation axis of the second feeding shaft is parallel to the rotation axis of the first feeding shaft, and a spiral groove is also arranged on the second feeding shaft, and the bottom of the spiral groove is connected with the groove.

5. The vertical spiral fine feeding device according to any one of claims 1 to 4, characterized in that: There are multiple openings, which are spaced apart along the circumference of the first feeding shaft. A push plate is arranged at the opening, and the push plate extends in a direction away from the axis of the first feeding shaft. The angle between the push plate and the opening is an acute angle.

6. The vertical spiral fine feeding device according to claim 5 is characterized in that: A support frame and a bearing are arranged between the first feeding shaft and the discharge hopper. The inner ring of the bearing is sleeved on the outer diameter of the first feeding shaft. The outer ring of the bearing and the support frame, as well as the support frame and the inner wall of the discharge hopper are fixedly connected.

7. The vertical spiral fine feeding device according to claim 6 is characterized in that: A cushion block is sleeved on the outer ring of the bearing. The cushion block is a split structure, comprising two gaskets with arc-shaped inner walls. The openings of the two gaskets are opposite to each other, and the cushion block is fixedly connected to the support frame.

8. The vertical spiral fine feeding device according to any one of claims 1-4, 6-7, characterized in that: A driving assembly for driving the first feeding shaft to rotate is arranged in the discharge hopper. The driving assembly includes a motor and a transmission mechanism. The output end of the motor is connected to the input end of the transmission mechanism, and the output end of the transmission mechanism is connected to the first feeding shaft.

9. The vertical spiral fine feeding device according to claim 8, characterized in that: The transmission mechanism comprises a belt, the input end of the belt is sleeved on the output end of the motor, and the output end of the belt is sleeved on the outer diameter of the first feeding shaft.

10. The vertical spiral fine feeding device according to claim 9, characterized in that: A cover body is fixed on the discharge hopper, a motor is fixed on the inner wall of the cover body, a feed hopper is fixed on the cover body and passes through the top wall of the cover body, an end of the second feeding shaft away from the discharge port extends out of the cover body, and the second feeding shaft is movably connected to the cover body.

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