A modified starch quantitative packaging machine

Abstract

This invention relates to the technical field of starch processing, and in particular to a modified starch quantitative packaging machine, comprising a feeding pipe, a guiding pipe, and a quantitative box arranged sequentially from top to bottom and interconnected. The guiding pipe and the quantitative box slide vertically on the feeding pipe synchronously. By moving the quantitative box downwards when the amount of starch in it reaches a predetermined value, the starch in the guiding pipe is prevented from continuing to flow into the quantitative box, thus suspending and isolating the starch that falls naturally from the quantitative box and the guiding pipe, thereby improving quantitative accuracy and providing time for the closing of the switch structure. By placing the switch structure at the bottom of the guiding pipe, the distance between the switch structure and the highest point of the starch in the quantitative box can be minimized, thereby reducing the amount of starch falling naturally over that distance and reducing interference.

Description

Technical Field

[0001] This invention relates to the technical field of starch processing, and in particular to a modified starch quantitative packaging machine. Background Technology

[0002] On starch processing production lines, quantitative packaging is a critical process before the finished product leaves the factory. Its accuracy directly determines the net content qualification rate and batch consistency of the product. Currently, the commonly used automated quantitative packaging method in the industry involves continuously feeding modified starch into a weighing container below through pneumatic conveying or spiral conveying pipelines. At the same time, a weighing sensor monitors the weight of the material in the container in real time. When the weight rises to a preset target threshold, the controller outputs a command to trigger the shut-off valve or pneumatic butterfly valve on the pipeline to close, thereby cutting off the supply. However, in actual operation, because the closing action requires a certain mechanical response time, and there is always a section of starch in a suspended or free-falling state in the pipeline between the valve and the container, when the valve is fully closed, this part of starch will still fall uncontrollably into the weighing container, causing the amount of starch weighed in the container to exceed the allowable tolerance limit, affecting the quantitative accuracy. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a modified starch quantitative packaging machine, the specific technical solution of which is as follows: The present invention provides a modified starch quantitative packaging machine, comprising a feeding pipe, a guiding pipe, and a quantitative box arranged sequentially from top to bottom and interconnected with each other. The guiding pipe and the quantitative box slide vertically on the feeding pipe synchronously. A switch structure one and a switch structure two are respectively provided at the bottom of the guiding pipe and the bottom of the quantitative box. A side platform and a telescopic rod are provided on the side of the material guiding pipe. The side platform is fixed relative to the material guiding pipe and has an upwardly inclined slope and a downwardly inclined slope. The telescopic rod is horizontally arranged and the movable end of the telescopic rod is used to contact the side platform. The movable end and the fixed end of the telescopic rod are connected by a spring.

[0004] Furthermore, the bottom of the feed pipe is inserted into the metering box, and the relative position between the feed pipe and the metering box in the vertical direction can be adjusted by fasteners.

[0005] Furthermore, a ball is rotatably provided at the movable end of the telescopic rod.

[0006] Furthermore, the spring is connected to the movable end of the telescopic rod via a connecting plate. When the connecting plate moves on the telescopic rod, the elastic force provided by the spring increases or decreases.

[0007] Furthermore, the quantitative packaging machine also includes an outer frame located outside the material guide pipe, the outer frame being connected to the material guide pipe by a spring, and a guide rail for guiding the material guide pipe and a plurality of rolling elements cooperating with the guide rail are provided on the inner wall of the outer frame.

[0008] Furthermore, a guide arc plate 1 and a guide arc plate 2 are provided on the slope 1. The end of the guide arc plate 1 and the end of the guide arc plate 2 form an inlet with the opening facing downwards. The guide arc plate 1 and the guide arc plate 2 form an arc-shaped channel 1. A vertical channel 2 is opened on the side platform, and the channel 2 is connected to the channel 1. The telescopic rod is horizontally slidable on the inner wall of the outer frame via a slider, and the slider is connected to the outer frame via a spring piece. In its natural state, the projections of the inlet and the second channel on the horizontal plane are located on both sides of the telescopic rod.

[0009] Furthermore, the switch structure includes two rotating shafts rotatably disposed on the inner wall of the material guide pipe and a sealing plate disposed on each of the rotating shafts; The end of the rotating shaft extends beyond the material guide pipe, and a gear is provided at the end of the rotating shaft. A rack is meshed on the gear. The rack moves horizontally on the material guide pipe. A connecting arm is provided on the rack, and a sliding column is provided on the connecting arm. A drive groove is provided on the inner wall of the outer frame. The drive groove is annular in shape. The sliding column works in conjunction with the drive groove and can move along the trajectory of the drive groove. The drive groove includes a first inclined groove, a second inclined groove, and a return groove.

[0010] Furthermore, the drive groove also includes a vertical groove connecting the inclined groove two and the return groove. The return groove is inclined, the connecting arm can slide on the rack, and the connecting arm and the rack are connected by a spring piece two.

[0011] The beneficial effects of this invention are as follows: By moving the metering box downwards when the starch level reaches a specified value, the starch in the feeding pipe is prevented from continuing to flow into the metering box, thus isolating the metering box from the naturally falling starch in the feeding pipe. This improves metering accuracy and provides time for the closing of switch structure one. By placing switch structure one at the bottom of the feeding pipe, the distance between switch structure one and the highest point of starch in the metering box is minimized, reducing the amount of naturally falling starch over that distance and minimizing interference. The combined use of slope one, slope two, telescopic rod, and spring one allows the telescopic rod and slope two to provide an upward thrust to the feeding pipe and metering box during starch metering, and the telescopic rod and slope one to provide a downward auxiliary thrust after starch metering. This achieves both quantitative detection and starch isolation according to different operational needs. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of a modified starch quantitative packaging machine; Figure 2 This is a schematic diagram of the inner structure of the outer frame; Figure 3 for Figure 2 A schematic diagram of the central platform and its superstructure; Figure 4 for Figure 3 A structural schematic diagram of the central platform from another perspective; Figure 5 This is a schematic diagram of the cross-sectional structure of the outer frame in this invention; Figure 6 This is a schematic cross-sectional view of the material guiding pipe in this invention; Figure 7 for Figure 2 A magnified view of the structure at point A in the middle; Figure label: 1. Feeding pipe; 2. Guide pipe; 3. Metering box; 4. Switch structure one; 5. Switch structure two; 6. Side platform; 7. Slope one; 8. Slope two; 9. Telescopic rod; 10. Spring one; 11. Ball; 12. Connecting plate; 13. Outer frame; 14. Spring two; 15. Guide rail; 16. Rolling element; 17. Guide arc plate one; 18. Guide arc plate two; 19. Inlet; 20. Channel one; 21. Channel two; 22. Slider; 23. Spring one; 24. Rotating shaft; 25. Sealing plate; 26. Gear; 27. Rack; 28. Connecting arm; 29. ​​Sliding column; 30. Inclined groove one; 31. Inclined groove two; 32. Return groove; 33. Vertical groove; 34. Spring two. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0015] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0016] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0017] like Figures 1 to 7 As shown, a modified starch quantitative packaging machine of the present invention includes a feeding pipe 1, a guiding pipe 2 and a quantitative box 3 arranged in sequence from top to bottom and connected to each other. The guiding pipe 2 and the quantitative box 3 slide vertically on the feeding pipe 1 synchronously. A switch structure 4 and a switch structure 5 are respectively provided at the bottom of the guiding pipe 2 and the bottom of the quantitative box 3. A side platform 6 and a telescopic rod 9 are provided on the side of the material guide pipe 2. The side platform 6 is fixed relative to the material guide pipe 2, and the side platform 6 has an upwardly inclined slope 7 and a downwardly inclined slope 8. The telescopic rod 9 is horizontally arranged, and the movable end of the telescopic rod 9 is used to contact the side platform 6. The movable end and the fixed end of the telescopic rod 9 are connected by a spring 10.

[0018] In this invention, the feeding pipe 1 is connected to an external modified starch conveying system, and the guiding pipe 2 is used to guide the starch conveyed downward by the feeding pipe 1 into the metering box 3. The metering box 3 is used to hold a specified amount of starch. Since the switch structure 4 is installed at the bottom of the guiding pipe 2, when the amount of starch in the metering box 3 increases, the distance between the switch structure 4 and the highest point of the starch in the metering box 3 will gradually decrease. That is to say, when the switch structure 4 is closed, there is less starch suspended below the switch structure 4. However, if the distance between the switch structure 4 and the highest point of the starch in the metering box 3 is large, there is more starch suspended in that distance. After this part of starch falls into the metering box 3, it will interfere with the amount of starch weighed by the metering box 3. Therefore, only by shortening this distance can the amount of suspended starch be minimized, interference reduced, and accuracy improved.

[0019] Switch structure 2 5 can be used to release a specified amount of starch stored in the metering box 3 into an external packaging bag or other packaging device. For ease of operation, switch structure 2 5 can be automatically switched by means of electromagnetic control, motor control or other methods.

[0020] The side platform 6 is set on the side wall of the material guide pipe 2. The telescopic rod 9 is set horizontally and its position is fixed. The telescopic rod 9 can move in and out along its length. The telescopic rod 9 is perpendicular to the side platform 6. The spring 10 provides elastic thrust to the movable end of the telescopic rod 9, so that the movable end of the telescopic rod 9 abuts against the side platform 6. Since there are slope 1 7 and slope 2 8 on the side platform 6, and the directions of slope 1 7 and slope 2 8 are different, the elastic force provided by the spring 10 to the telescopic rod 9 can restrict the downward movement of the side platform 6 and the material guide pipe 2 through slope 2 8 when the telescopic rod 9 is in contact with slope 2 8. When the telescopic rod 9 is in contact with slope 1 7, the telescopic rod 9 provides downward auxiliary thrust to the side platform 6 and the material guide pipe 2 through slope 1 7. Thus, by utilizing the interaction between the telescopic rod 9 and the side platform 6 at different positions, two different working modes of providing force to the material guide pipe 2 can be realized.

[0021] In use, starch is continuously fed into the metering box 3 through the feeding pipe 1 and the guiding pipe 2. As the amount of starch in the metering box 3 gradually increases, the highest point of the starch in the metering box 3 gradually approaches the switch structure 4, and the overall weight of the metering box 3 and the guiding pipe 2 gradually increases, causing it to move downwards. The guiding pipe 2 drives the side platform 6 to move synchronously. The side platform 6 pushes the telescopic rod 9 to retract through the slope 8, and the spring 10 undergoes elastic deformation. When the telescopic rod 9 moves from the slope 8 to the slope 7, the spring 10 provides a downward auxiliary thrust to the side platform 6 through the telescopic rod 9. Based on the gravity of the guiding pipe 2 and the metering box 3 themselves, the guiding pipe 2 and the metering box 3... The rapid descent of the feed pipe 2, with its falling speed greater than or equal to the speed of the starch falling naturally within it, prevents the suspended starch in the feed pipe 2 from continuing to fall into the metering box 3. At this point, the switch structure 4 is closed, isolating the suspended starch falling from the feed pipe 2. The amount of starch inside the metering box 3 then reaches the specified value. The rapid descent of the feed pipe 2 and the metering box 3 prevents the starch falling naturally from the feed pipe 2 from continuing to fall into the metering box 3, thus providing time for the switch structure 4 to close. This avoids the starch in the feed pipe 2 continuing to fall and affecting the metering accuracy of the starch in the metering box 3 when the switch structure 4 is closed.

[0022] It should be noted that, since the metering box 3 is in a downward moving state as the starch continuously falls into it, the rapid downward movement of the metering box 3 will not cause the starch in the metering box 3 to flow back into the feed pipe 2. At the same time, the speed of the metering box 3 during its rapid downward movement is gradually increasing rather than suddenly accelerating, thus ensuring that the metering box 3 and the starch inside it can move synchronously.

[0023] When the starch content in the metering box 3 reaches the specified value, the metering box 3 moves downward, thus preventing starch from the feed pipe 2 from continuing to flow into the metering box 3. This keeps the metering box 3 and the starch falling naturally in the feed pipe 2 in a suspended state, thereby improving metering accuracy and providing time for the closing of the switch structure 4. By placing the switch structure 4 at the bottom of the feed pipe 2, the distance between the switch structure 4 and the highest point of the starch in the metering box 3 can be minimized, thereby reducing the amount of starch falling naturally in that distance and reducing interference. By using the combined use of slope 7, slope 8, telescopic rod 9, and spring 10, the telescopic rod 9 and slope 8 can provide an upward thrust to the feed pipe 2 and metering box 3 during starch metering, and the telescopic rod 9 and slope 7 can provide a downward auxiliary thrust to the feed pipe 2 and metering box 3 after starch metering. This achieves the purpose of quantitative detection and starch suspension isolation according to different working requirements.

[0024] Furthermore, the bottom of the feed pipe 2 is inserted into the metering box 3. In the vertical direction, the relative position between the feed pipe 2 and the metering box 3 can be adjusted by fasteners.

[0025] By adjusting the relative position of the feed pipe 2 and the metering box 3, the height of the bottom of the feed pipe 2 inside the metering box 3 can be adjusted, thereby adjusting the distance between the switch structure 4 and the highest point of starch inside the metering box 3, which is convenient to adapt to different metering specifications and needs.

[0026] Furthermore, when the telescopic rod 9 moves on the side platform 6, in order to reduce the friction between the telescopic rod 9 and the side platform 6, a ball 11 can be rotatably installed on the movable end of the telescopic rod 9. This reduces friction by having the ball 11 roll on the first slope 7 and the second slope 8, while avoiding interference with the quantitative accuracy caused by friction.

[0027] Furthermore, spring 10 is connected to the movable end of telescopic rod 9 via connecting plate 12. When connecting plate 12 moves on telescopic rod 9, the elastic force provided by spring 10 to telescopic rod 9 increases or decreases.

[0028] By adjusting the elastic force provided by spring-10 to telescopic rod 9, the magnitude of the force required to overcome spring-10 when the feed pipe 2 and side platform 6 move downward can be adjusted, thereby adjusting the quantitative value of starch. When the elastic force of spring-10 increases, the amount of starch contained in the quantitative box 3 increases, and when the elastic force of spring-10 decreases, the amount of starch contained in the quantitative box 3 decreases.

[0029] Furthermore, the quantitative packaging machine also includes an outer frame 13 located outside the material guide pipe 2. The outer frame 13 is connected to the material guide pipe 2 by a spring 14. A guide rail 15 for guiding the material guide pipe 2 and several rolling elements 16 that cooperate with the guide rail 15 are provided on the inner wall of the outer frame 13.

[0030] The outer frame 13 can provide an upward restoring force to the feed pipe 2 through spring 2 14. When starch falls into the metering box 3, the weight of the starch and the feed pipe 2 and metering box 3 will pull spring 2 14 to extend. When the starch in the metering box 3 is emptied, the force provided by spring 2 14 to the feed pipe 2 and metering box 3 can make them move upward and return to their original position. It should be noted that since spring 2 14 also provides an upward force to the feed pipe 2 and metering box 3, the metering of starch needs to take into account both the elastic force of spring 2 14 and the elastic force of spring 10.

[0031] The guide rail 15 is disposed on the inner side wall of the outer frame 13, and a number of rolling elements 16 are mounted on the guide rail 15. The rolling elements 16 are connected to the material guide pipe 2, thereby using the guide rail 15 and the rolling elements 16 to provide guidance for the movement of the material guide pipe 2.

[0032] Furthermore, a guide arc plate 17 and a guide arc plate 28 are provided on the slope 7. The end of the guide arc plate 17 and the end of the guide arc plate 28 form an inlet 19 with the opening facing downward. The guide arc plate 17 and the guide arc plate 28 form an arc-shaped channel 20. A vertical channel 21 is provided on the side platform 6, and the channel 21 is connected to the channel 20. The telescopic rod 9 is horizontally slidable on the inner wall of the outer frame 13 via the slider 22, and the slider 22 is connected to the outer frame 13 via the spring piece 23. In its natural state, the projections of the inlet 19 and the channel 21 on the horizontal plane are located on both sides of the telescopic rod 9.

[0033] When the feed pipe 2 moves downward, the ball 11 on the telescopic rod 9 slides from the second slope 8 to the first slope 7. Then, the guide plate 17 guides the ball 11, causing the ball 11 and the telescopic rod 9 to move horizontally. At this time, the slider 22 slides inside the outer frame 13, and the spring plate 23 undergoes elastic deformation. When the ball 11 moves to the position of the inlet 19, the ball 11 will enter the channel 20 through the inlet 19. At this time, the starch in the metering box 3 is emptied, and the spring 14 pulls the feed pipe 2 and the metering box 3 upward. The spring plate 23 provides lateral elastic force for the telescopic rod 9 and the ball 11. This will cause the ball 11 to move along the trajectory of channel 1 20. When the ball 11 enters channel 2 21, the telescopic rod 9 will be displaced in another direction. At this time, the spring piece 1 23 will deform in the opposite direction. When the ball 11 moves out of channel 2 21, the elastic force provided by the spring piece 1 23 to the slider 22 will cause the telescopic rod 9 and the ball 11 to move to the initial position in the horizontal direction. At this time, the ball 11 will be re-aligned with the slope 2 8. This makes it easier for the telescopic rod 9 and the ball 11 to no longer provide resistance to the material guide pipe 2 through the side platform 6 when the material guide pipe 2 and the metering box 3 are reset, so that the material guide pipe 2 can be moved upward and reset.

[0034] Furthermore, the switch structure 4 includes two rotating shafts 24 that are rotatably disposed on the inner wall of the feed pipe 2 and a sealing plate 25 disposed on each rotating shaft 24; The end of the rotating shaft 24 extends beyond the material guide pipe 2, and a gear 26 is provided at the end of the rotating shaft 24. A rack 27 is meshed on the gear 26. The rack 27 moves horizontally on the material guide pipe 2. A connecting arm 28 is provided on the rack 27, and a sliding column 29 is provided on the connecting arm 28. A drive groove is provided on the inner wall of the outer frame 13. The drive groove is annular in shape. The sliding column 29 works in conjunction with the drive groove and can move along the trajectory of the drive groove. The drive groove includes a first inclined groove 30, a second inclined groove 31, and a return groove 32.

[0035] When the feed pipe 2 moves downward, it pulls the sliding column 29 to slide tilted within the inclined groove 30 via the rack 27 and connecting arm 28. At this time, the rack 27 is displaced in the horizontal direction. The rack 27 drives the rotating shaft 24 and the sealing plate 25 to rotate via the gear 26. The two sealing plates 25 open, and the starch in the feed pipe 2 can fall naturally into the metering box 3. When the sliding column 29 slides from the inclined groove 30 into the inclined groove 31, the rack 27 moves in the opposite direction in the horizontal direction, and the two sealing plates 25 close. At this time, the feed pipe... The starch in pipe 2 is blocked by the two sealing plates 25 and cannot enter the metering box 3. The second switch structure 5 is opened, and the starch in the metering box 3 is discharged. When the sliding column 29 moves in the inclined groove 31, the feed pipe 2 returns to its original position. At this time, the two sealing plates 25 are in the closed state, and the second switch structure 5 is closed. When the sliding column 29 moves back into the inclined groove 30, the sealing plate 25 is reopened, and the starch falls back into the metering box 3. This realizes the cyclic metering working mode, and the feed pipe 1 can continuously supply starch.

[0036] Furthermore, the drive groove also includes a vertical groove 33 connecting the inclined groove 31 and the return groove 32. The return groove 32 is inclined, the connecting arm 28 can slide on the rack 27, and the connecting arm 28 and the rack 27 are connected by a spring piece 34.

[0037] Because the return trough 32 is inclined, when the sliding column 29 moves upward within the return trough 32, the two sliding columns 29 generate a horizontal displacement away from the inclined trough 30. At this time, the sealing plate 25 is in a closed state, the gear 26 and rack 27 are stationary, the connecting arm 28 slides on the rack 27, and the second spring plate 34 undergoes elastic deformation. When the sliding column 29 moves to the top of the return trough 32, the lateral elastic force provided by the second spring plate 34 to the connecting arm 28 and the sliding column 29 allows the sliding column 29 to smoothly enter the inclined trough 30. When the sliding column 29 moves to the bottom of the inclined trough 31, the second spring plate 34 undergoes reverse elastic deformation. The lateral elastic force provided by the second spring plate 34 to the sliding column 29 allows it to smoothly move from the inclined trough 31 into the return trough 32. Thus, as the guide pipe 2 moves up and down, the sliding column 29 can automatically circulate along the trajectory of the inclined trough 30, the inclined trough 31, and the return trough 32 without additional control.

[0038] The vertical groove 33 is located at the bottom of the inclined groove 31, and the vertical groove 33 connects the inclined groove 31 and the return groove 32. When the sliding column 29 moves in the vertical groove 33, the sealing plate 25 is in a closed state, and the feed pipe 2 and the metering box 3 move down. The switch structure 2 5 is opened, and the starch in the metering box 3 is discharged, thereby preventing the starch in the feed pipe 2 from entering the metering box 3 when the metering box 3 is discharging starch.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A modified starch quantitative packaging machine, characterized in that, It includes a feeding pipe, a guiding pipe, and a metering box arranged sequentially from top to bottom and interconnected. The guiding pipe and the metering box slide vertically on the feeding pipe synchronously. Switch structure one and switch structure two are respectively provided at the bottom of the guiding pipe and the bottom of the metering box. A side platform and a telescopic rod are provided on the side of the material guiding pipe. The side platform is fixed relative to the material guiding pipe and has an upwardly inclined slope and a downwardly inclined slope. The telescopic rod is horizontally arranged and the movable end of the telescopic rod is used to contact the side platform. The movable end and the fixed end of the telescopic rod are connected by a spring.

2. The modified starch quantitative packaging machine according to claim 1, characterized in that, The bottom of the feed pipe is inserted into the metering box. In the vertical direction, the relative position between the feed pipe and the metering box can be adjusted by fasteners.

3. The modified starch quantitative packaging machine according to claim 1, characterized in that, The movable end of the telescopic rod is rotatably equipped with a ball.

4. A modified starch quantitative packaging machine according to claim 1, characterized in that, The spring is connected to the movable end of the telescopic rod via a connecting plate. When the connecting plate moves on the telescopic rod, the elastic force provided by the spring increases or decreases.

5. A modified starch quantitative packaging machine according to claim 1, characterized in that, The quantitative packaging machine also includes an outer frame located outside the material guide pipe. The outer frame is connected to the material guide pipe by a spring. A guide rail for guiding the material guide pipe and a plurality of rolling elements that cooperate with the guide rail are provided on the inner wall of the outer frame.

6. A modified starch quantitative packaging machine according to claim 5, characterized in that, A guide arc plate 1 and a guide arc plate 2 are provided on the slope 1. The end of the guide arc plate 1 and the end of the guide arc plate 2 form an inlet with the opening facing downward. The guide arc plate 1 and the guide arc plate 2 form an arc-shaped channel 1. A vertical channel 2 is opened on the side platform, and the channel 2 is connected to the channel 1. The telescopic rod is horizontally slidable on the inner wall of the outer frame via a slider, and the slider is connected to the outer frame via a spring piece. In its natural state, the projections of the inlet and the second channel on the horizontal plane are located on both sides of the telescopic rod.

7. A modified starch quantitative packaging machine according to claim 1, characterized in that, The switch structure includes two rotating shafts that are rotatably disposed on the inner wall of the material guide pipe and a sealing plate disposed on each of the rotating shafts; The end of the rotating shaft extends beyond the material guide pipe, and a gear is provided at the end of the rotating shaft. A rack is meshed on the gear. The rack moves horizontally on the material guide pipe. A connecting arm is provided on the rack, and a sliding column is provided on the connecting arm. A drive groove is provided on the inner wall of the outer frame. The drive groove is annular in shape. The sliding column works in conjunction with the drive groove and can move along the trajectory of the drive groove. The drive groove includes a first inclined groove, a second inclined groove, and a return groove.

8. A modified starch quantitative packaging machine according to claim 7, characterized in that, The drive groove also includes a vertical groove connecting the inclined groove two and the return groove. The return groove is inclined. The connecting arm can slide on the rack, and the connecting arm and the rack are connected by a spring piece two.

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