A device for quantitative addition of excipients

Abstract

This utility model discloses a quantitative additive device for auxiliary materials, including a base, a weighing component, a support, a material cylinder, a stirring component, a screw feeding component, and an electrical control box. The material cylinder is vertically mounted on the support, and a stirring component driven by a stirring motor is located at its center. The screw feeding component includes a vertical feeding screw and a reverse sealing screw connected to it. The blade diameter and pitch of the sealing screw are smaller than those of the feeding screw, and it contains only 1 / 2 to 2 turns of blades, thus forming a mechanical seal to prevent leakage when the machine stops. This utility model effectively solves the problems of easy bridging in horizontal arrangements and the need for valves to prevent leakage in vertical arrangements through its vertical arrangement and unique reverse screw sealing structure. It has the outstanding advantages of simple structure, accurate metering, no residue, and easy maintenance.

Description

Technical Field

[0001] This utility model relates to the field of material conveying and precise metering technology, specifically to a device for quantitative addition of auxiliary materials. Background Technology

[0002] In the production processes of industries such as chemicals, pharmaceuticals, and food, it is often necessary to add trace or small amounts of auxiliary materials precisely and continuously to the main production line. Loss-in-weight screw feeders are widely used in this field because they can achieve continuous and highly precise quantitative conveying.

[0003] Currently, most loss-in-weight screw feeders that achieve high-precision quantitative addition use a horizontally arranged screw. This traditional structure is prone to "bridging" or "rat holes" in the horizontal hopper for powders with poor flowability, high moisture absorption, or adhesiveness. This prevents the material from entering the screw stably and continuously, causing conveying interruptions or fluctuations, severely compromising metering accuracy and production continuity. Furthermore, the bottom of the horizontal hopper is prone to dead zones during unloading, leading to material residue. This not only causes waste and cross-contamination but also makes cleaning work arduous when changing material types.

[0004] To address these issues, some solutions attempt to vertically arrange the screw and hopper. This structure fully utilizes gravity to promote material flow, effectively eliminating bridging and significantly improving hopper emptying rates. However, when the vertically arranged screw stops rotating, the material inside the barrel will automatically flow out from the bottom outlet under its own gravity, resulting in "dripping" or "dropping," which is unacceptable in applications requiring frequent start-stop cycles or precise control of the feed rate.

[0005] The most common measure to prevent leakage when a vertical screw conveyor stops is to install a pneumatic or electric shut-off valve at the discharge port. This valve, interlocked with the screw motor, instantly closes to block material flow when the machine stops. However, this solution introduces additional power units and actuators, increasing not only the manufacturing cost and control system complexity but also reliability and maintenance costs due to wear, jamming, or malfunction of the valve's moving parts.

[0006] Therefore, finding a vertical spiral metering device that is simple in structure, low in cost, requires no external valves, and can effectively prevent leakage during shutdown has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0007] In order to overcome the above-mentioned defects of existing screw feeders, this utility model provides a device for quantitative addition of auxiliary materials.

[0008] The technical solution adopted by this utility model is as follows: A quantitative addition device for auxiliary materials includes: a base; a weighing component disposed on the base; a support mounted on the weighing component and bearing its weight; a material cylinder vertically mounted on the support, which is conical in shape and has a discharge port at the top; a stirring component and a screw feeding component disposed inside the material cylinder; and an electrical control box electrically connected to the weighing component, the stirring component, and the screw feeding component; wherein, the screw feeding component includes a vertically arranged feeding screw and a sealing screw fixed to the end of the feeding screw, the blades of the sealing screw rotating in the opposite direction to the blades of the feeding screw, and the blade diameter of the sealing screw being smaller than the blade diameter of the feeding screw.

[0009] Preferably, the pitch of the sealing screw is smaller than the pitch of the feeding screw, and the sealing screw includes 1 / 2 to 2 turns of blades.

[0010] Preferably, the connecting end face of the sealing screw is provided with a rectangular plug and a through connecting hole, and the connecting end face of the feeding screw is provided with a rectangular plug interface and a threaded hole; the rectangular plug and the rectangular plug interface are plugged in and fixed by bolt connection.

[0011] Preferably, a screw sleeve is installed at the outlet of the barrel, and the sealing screw is arranged within the length range of the screw sleeve.

[0012] Preferably, the material cylinder is divided into a connected cylindrical section and a conical section from top to bottom. The conical section has a split structure and includes a fixed hopper and a movable hopper. The movable hopper is rotatably connected to realize the opening and closing of the conical section.

[0013] Preferably, the movable hopper is connected to the cylindrical part via a top buckle, connected to the fixed hopper via a side buckle, and locked and fixed to the fixed hopper and the screw sleeve via a movable clamp.

[0014] Preferably, the wall of the cylindrical portion is made of a transparent material.

[0015] Preferably, the stirring assembly includes: a stirring spindle sleeve, vertically disposed at the center of the material cylinder; a stirring motor for driving the stirring spindle sleeve to rotate; at least one stirring curved blade and at least one stirring straight blade, fixedly mounted on the stirring spindle sleeve, and the stirring curved blade and the stirring straight blade are arranged symmetrically at 180°.

[0016] Preferably, the spiral feeding assembly further includes: a feeding spindle, which is connected and fixed to the feeding screw; and a servo motor for driving the feeding spindle to rotate; wherein the feeding spindle and the stirring spindle sleeve are concentrically fitted through bearings, and their rotations do not interfere with each other.

[0017] Preferably, the weighing component is a loss-in-weight scale sensor.

[0018] This utility model has the following beneficial effects: 1. Eliminate residue: The vertically arranged cylinder uses the material's own weight to flow, avoiding the "bridging" and "mouse hole" phenomena commonly seen in horizontally arranged screw sleeves. This ensures that the material inside the cylinder can be completely emptied without any residue dead corners, making it suitable for viscous powders and occasions where frequent material changes are required. 2. Valveless sealing to prevent dripping: By setting a short sealing screw with opposite rotation direction and smaller diameter and pitch at the end of the feeding screw, the compressed material can naturally form an effective seal when the machine stops, preventing the material from dripping due to gravity. At the same time, it eliminates the need for traditional pneumatic or electric shut-off valves, simplifies the structure, reduces manufacturing costs, control system complexity and subsequent maintenance costs, and improves the reliability of the whole machine. 3. High-precision metering: The integrated loss-in-weight sensor is used as a weighing component, combined with a servo motor-driven screw feeder, forming a high-precision loss-in-weight metering system. The stable material flow brought by the vertical arrangement and the valveless anti-drip characteristics together ensure that the entire addition process is continuous, stable and accurate. 4. Easy to clean: The cone section of the material cylinder adopts a split design, which can be easily opened to fully expose the inside of the material cylinder and the screw feeding assembly, facilitating thorough cleaning and maintenance of the interior and the screw, meeting the high hygiene requirements of the food, pharmaceutical and other industries. 5. Compact structure and intuitive observation: The mixing component and the screw feeding component adopt a concentric layout of the main shaft, which is compact, efficient in power transmission and does not interfere with each other; the transparent cylindrical part allows the operator to intuitively observe the material level and material flow status inside the barrel, which is convenient for production management. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram from another angle of an embodiment of the present invention (with the movable hopper open).

[0021] Figure 3 This is a schematic diagram of the spiral feeding assembly and the stirring assembly in an embodiment of this utility model.

[0022] Figure 4 This is an exploded view of the spiral feeding assembly in an embodiment of this utility model.

[0023] Figure 5 This is an exploded view of the spiral feeding assembly from another angle in an embodiment of this utility model.

[0024] 1-Base; 2-Weighing components; 3-Staff; 4-Cylinder, 4.1-Cylindrical section, 4.2-Fixed hopper, 4.3-Modible hopper, 4.4-Top latch, 4.5-Side latch, 4.6-Modible clamp, 4.7-Feeding port; 5-Agitator assembly, 5.1-Agitator spindle sleeve, 5.2-Agitator motor, 5.3-Agitator blades, 5.4-Agitator blades; 6-Screw feeding assembly, 6.1-Feeding screw, 6.2-Sealing screw, 6.3-Rectangular connector, 6.4-Connecting hole, 6.5-Rectangular connector, 6.6-Threaded hole, 6.7-Feeding spindle, 6.8-Servo motor; 7-Electrical control box; 8-Screw sleeve. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0026] In the embodiments, such as Figures 1-5 As shown, an auxiliary material quantitative addition device includes: a base 1; a weighing component 2, disposed on the base 1; a support 3, installed on the weighing component 2 and supported by it; a material cylinder 4, vertically installed on the support 3, generally conical in shape, with a discharge port at the top; a stirring component 5 and a screw feeding component 6, disposed inside the material cylinder 4; and an electrical control box 7, electrically connected to the weighing component 2, the stirring component 5, and the screw feeding component 6; wherein, the screw feeding component 6 includes a vertically arranged feeding screw 6.1 and a sealing screw 6.2 fixed to the end of the feeding screw 6.1, the blade rotation direction of the sealing screw 6.2 being opposite to that of the blade rotation direction of the feeding screw 6.1, and the blade diameter of the sealing screw 6.2 being smaller than that of the blade diameter of the feeding screw 6.1. In this embodiment, the vertically arranged material cylinder 4 and the screw feeding assembly 6 utilize the material's own weight to promote flow, effectively eliminating the bridging and rat hole phenomena common in horizontally arranged screw feeding devices, ensuring no material residue. The sealing screw 6.2 at the end of the feeding screw 6.1 adopts a reverse rotation direction and a smaller blade diameter, forming a mechanical seal by compressing the material when the machine stops, preventing leakage, eliminating the need for external valves, simplifying the structure and improving reliability. The weighing assembly 2 works in conjunction with the electrical control box 7 to achieve high-precision metering.

[0027] In this embodiment, the pitch of the sealing screw 6.2 is smaller than that of the feeding screw 6.1, and the sealing screw 6.2 includes 1 / 2 to 2 turns of blades. The smaller pitch of the sealing screw 6.2 and the limitation of the number of blade turns to 1 / 2 to 2 turns optimize the compression force in the sealing area, enhance the sealing effect when the machine stops, prevent material from flowing by itself, and avoid excessive resistance affecting the feeding efficiency.

[0028] In the embodiments, such as Figures 4-5As shown, the connecting end face of the sealing screw 6.2 is provided with a rectangular plug-in 6.3 and a through connecting hole 6.4, and the connecting end face of the feeding screw 6.1 is correspondingly provided with a rectangular plug-in interface 6.5 and a threaded hole 6.6; the rectangular plug-in 6.3 and the rectangular plug-in interface 6.5 are plugged in and fixed by bolts. The split-type feeding screw 6.1 and sealing screw 6.2 are easy to manufacture. The sealing screw 6.2 is plugged in with the rectangular plug-in interface 6.5 of the feeding screw 6.1 through the rectangular plug-in 6.3 and fixed by bolts, ensuring the reliability of transmission and enabling quick disassembly and assembly, which is convenient for inspection and maintenance.

[0029] In the embodiments, such as Figures 1-2 As shown, a screw sleeve 8 is installed at the outlet of the barrel 4, and a sealing screw 6.2 is arranged within the length of the screw sleeve 8. The screw sleeve 8 has a smaller diameter than the barrel 4, and the sealing screw 6.2 is located within its length, which can provide a stable sealing environment, enhance the reliability of the reverse spiral seal, and prevent material leakage at the outlet.

[0030] In the embodiments, such as Figures 1-2 As shown, the material cylinder 4 is divided into a connected cylindrical section 4.1 and a conical section from top to bottom. The conical section has a split-type structure, including a fixed hopper 4.2 and a movable hopper 4.3. The movable hopper 4.3 is rotatably connected to open and close the conical section. The split-type structure of the conical section of the material cylinder 4 allows the interior of the cylinder to be fully exposed after rotation, facilitating thorough cleaning and maintenance and meeting the needs of industries with high hygiene requirements.

[0031] In the embodiments, such as Figure 2 As shown, the movable hopper 4.3 is connected to the cylindrical part 4.1 via a top latch 4.4, and to the fixed hopper 4.2 via a side latch 4.5. It is then locked and secured to the fixed hopper 4.2 and the screw sleeve 8 via a movable clamp 4.6. This connection structure ensures that the movable hopper 4.3 is securely locked when closed, preventing material leakage, while allowing for flexible opening and simplifying cleaning operations.

[0032] In the embodiments, such as Figures 1-2 As shown, the cylindrical section 4.1 has a wall made of transparent material. Transparent materials can be such as plexiglass, allowing operators to directly observe the material level and flow within the drum, enabling real-time monitoring of the production process and improving management efficiency.

[0033] In the embodiments, such as Figure 3As shown, the mixing assembly 5 includes: a mixing spindle sleeve 5.1, vertically positioned at the center of the material cylinder 4; a mixing motor 5.2 for driving the mixing spindle sleeve 5.1 to rotate; at least one curved mixing blade 5.3 and at least one straight mixing blade 5.4, fixedly mounted on the mixing spindle sleeve 5.1, with the curved mixing blade 5.3 and the straight mixing blade 5.4 arranged symmetrically at 180°. The curved mixing blade 5.3 is used to mix the middle position of the material cylinder 4, and the straight mixing blade 5.4 is used to mix the edge of the material cylinder 4. The two work together to achieve efficient mixing, prevent material adhesion or accumulation, and ensure uniform material flow.

[0034] In the embodiments, such as Figure 3 As shown, the screw feeding assembly 6 further includes: a feeding spindle 6.7, which is connected and fixed to the feeding screw 6.1; and a servo motor 6.8, used to drive the feeding spindle 6.7 to rotate. The feeding spindle 6.7 and the stirring spindle sleeve 5.1 are concentrically fitted together via bearings, and their rotations do not interfere with each other. This transmission method has a compact structure, reduces space occupation, and ensures that the feeding and stirring movements do not interfere with each other, thus improving operational stability and accuracy.

[0035] In this embodiment, the weighing component 2 employs a loss-in-weight sensor. The loss-in-weight sensor directly measures the reduction in material mass, achieving high-precision continuous metering. Combined with its vertical arrangement and anti-drip design, it ensures a stable and reliable addition process, meeting the precise control requirements for trace amounts of auxiliary materials. It is unaffected by changes in material density, and its accuracy is far superior to volumetric metering.

[0036] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A device for quantitatively adding excipients, characterized in that, include: Base (1); Weighing component (2) is mounted on the base (1); The bracket (3) is installed on the weighing assembly (2) and bears the weight thereon; The material cylinder (4) is vertically installed on the bracket (3), and is cone-shaped with a discharge port at the top; The mixing assembly (5) and the screw feeding assembly (6) are disposed inside the material cylinder (4); The electrical control box (7) is electrically connected to the weighing assembly (2), the stirring assembly (5) and the screw feeding assembly (6); The spiral feeding assembly (6) includes a vertically arranged feeding screw (6.1) and a sealing screw (6.2) fixed to the end of the feeding screw (6.1). The blades of the sealing screw (6.2) rotate in the opposite direction to the blades of the feeding screw (6.1), and the blade diameter of the sealing screw (6.2) is smaller than the blade diameter of the feeding screw (6.1).

2. The excipient quantitative addition device according to claim 1, characterized in that, The pitch of the sealing screw (6.2) is smaller than that of the feeding screw (6.1), and the sealing screw (6.2) includes 1 / 2 to 2 turns of blades.

3. The excipient quantitative addition device according to claim 1 or 2, characterized in that, The sealing screw (6.2) has a rectangular plug (6.3) and a through connecting hole (6.4) on its connecting end face. The feeding screw (6.1) has a rectangular plug interface (6.5) and a threaded hole (6.6) on its connecting end face. The rectangular plug (6.3) is plugged into the rectangular plug interface (6.5) and fixed by bolt connection.

4. The excipient quantitative addition device according to claim 1, characterized in that, A screw sleeve (8) is installed at the outlet of the barrel (4), and the sealing screw (6.2) is arranged within the length range of the screw sleeve (8).

5. The excipient quantitative addition device according to claim 4, characterized in that, The material cylinder (4) is divided into a cylindrical part (4.1) and a conical part from top to bottom. The conical part is a split structure, including a fixed hopper (4.2) and a movable hopper (4.3). The movable hopper (4.3) is rotatably connected to realize the opening and closing of the conical part.

6. The excipient quantitative addition device according to claim 5, characterized in that, The movable hopper (4.3) is connected to the cylindrical part (4.1) via a top buckle (4.4), and to the fixed hopper (4.2) via a side buckle (4.5). It is locked and fixed to the fixed hopper (4.2) and the screw sleeve (8) via a movable clamp (4.6).

7. The excipient quantitative addition device according to claim 5, characterized in that, The cylindrical part (4.1) has a wall made of a transparent material.

8. The excipient quantitative addition device according to claim 1, characterized in that, The stirring assembly (5) includes: The stirring spindle sleeve (5.1) is vertically positioned at the center of the material cylinder (4); A stirring motor (5.2) is used to drive the stirring spindle sleeve (5.1) to rotate; At least one stirring curved blade (5.3) and at least one stirring straight blade (5.4) are fixedly installed on the stirring main shaft sleeve (5.1), and the stirring curved blade (5.3) and the stirring straight blade (5.4) are arranged symmetrically at 180°.

9. The excipient quantitative addition device according to claim 8, characterized in that, The spiral feeding assembly (6) further includes: The feeding spindle (6.7) is connected and fixed to the feeding screw (6.1); A servo motor (6.8) is used to drive the feeding spindle (6.7) to rotate; The feeding spindle (6.7) and the stirring spindle sleeve (5.1) are concentrically fitted together by bearings, and their rotations do not interfere with each other.

10. The excipient quantitative addition device according to claim 1, characterized in that, The weighing component (2) uses a loss-in-weight sensor.

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