Single / double screw interchangeable loss-in-weight scale

Abstract

This invention discloses an interchangeable single-screw and twin-screw loss-in-weight scale, comprising a main structure of the scale and a single-screw module and a twin-screw module. The single-screw module and the twin-screw module can be interchangeably combined with the main structure to form either a single-screw loss-in-weight scale or a twin-screw loss-in-weight scale. The flexibility of a single machine for dual use is achieved by designing the single-screw and twin-screw modules as interchangeable independent units. Users do not need to purchase two separate devices; they can switch between "precision metering of granules" (single-screw) and "precision metering of powders" (twin-screw) operating conditions simply by changing the modules. This reduces equipment costs by more than 50%, making it particularly suitable for small and medium-sized production enterprises. The weighing platform, screw motor, and stirring motor in the main structure remain fixed; only modular components including the gearbox, screw, and ball hopper need to be replaced, significantly reducing repetitive design and manufacturing work, while also lowering maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of loss-in-weight scale technology, and specifically to a single-screw and double-screw interchangeable loss-in-weight scale. Background Technology

[0002] Loss-in-weight scales play a crucial role in the field of precise material metering and feeding. Currently, loss-in-weight scales on the market are mainly divided into two types: single-screw loss-in-weight scales and twin-screw loss-in-weight scales.

[0003] A single-screw loss-in-weight feeder typically consists of a screw, a drive motor, a load cell, and a hopper. Its working principle involves the motor driving the screw to rotate, feeding material from the hopper. Simultaneously, the load cell monitors the weight change of the material in the hopper in real time, calculating the feed rate based on the weight change to achieve quantitative feeding. Single-screw feeders are particularly suitable for feeding granular materials due to their simple structure and lower cost.

[0004] Twin-screw loss-in-weight feeders are equipped with two screws, which are also driven by a motor to rotate and feed materials. Compared to single-screw loss-in-weight feeders, twin-screw feeders offer better feeding stability and uniformity when feeding materials with poor flowability and a tendency to clump, allowing for more precise control of the feed rate. Twin-screw feeders are also well-suited for feeding powders; the intermeshing screws provide a self-cleaning capability, preventing feed rate fluctuations or even blockages caused by powder sticking to the screws. Additionally, it's important to note that proper mixing within the hopper is essential to prevent powder bridging during feeding.

[0005] In existing technologies, single-screw and twin-screw loss-in-weight balances are independent devices, each with a fixed screw structure. Users must determine whether to purchase a single-screw or twin-screw loss-in-weight balance based on the characteristics of their main materials and production needs. Once the equipment is selected and put into use, it is impossible to switch between the two modes. Because single-screw and twin-screw loss-in-weight balances have limited functionality and are not interchangeable, companies that need to handle various materials with different characteristics in their production processes must purchase separate single-screw and twin-screw loss-in-weight balances. This undoubtedly increases the company's equipment procurement costs and requires more factory space to house these devices, further increasing the company's operating costs.

[0006] Existing loss-in-weight scales were designed from the outset with single-screw and twin-screw structures as two separate design options, without considering the need for modular interchangeability. Key components such as the screw, motor, and gearbox are usually integrated, making disassembly and replacement difficult and hindering rapid switching between different screw structures.

[0007] Even though key components such as the screw, motor, and gearbox can be switched between single and twin-screw modules, the design of the agitator presents a challenge. When switching between single and twin-screw modules, it's not enough to simply consider the screw model; the agitator's mixing effect on the hopper must also be taken into account. Since wall-mounted mixing is preferred for materials in the hopper, the edge of the agitator should be as close as possible to the inner wall of the hopper to facilitate scraping and prevent material from adhering to it. The screw's helical outer diameter also needs to be positioned close to or even inside the inner wall of the hopper to efficiently deliver material out, avoiding the need for long discharge pipes and preventing material bridging within them. Therefore, the design of single and twin-screw modules must comprehensively consider the relevant design parameters between the screw and the agitator to ensure that the agitator provides good scraping and mixing while both single and twin screws offer good feeding efficiency.

[0008] In view of the above, it is necessary to propose a single-screw and double-screw interchangeable loss-in-weight scale to solve the above problems. Summary of the Invention

[0009] The purpose of this invention is to overcome the defects in the prior art and provide a single-screw and twin-screw interchangeable loss-in-weight scale.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows: A single-screw and twin-screw interchangeable loss-in-weight scale includes a main structure of the loss-in-weight scale and a single-screw module and a twin-screw module. The single-screw module and the twin-screw module can be interchangeably combined with the main structure to form a single-screw loss-in-weight scale or a twin-screw loss-in-weight scale, respectively.

[0011] Furthermore, the main structure includes a weighing platform, a hopper, a screw motor, and a stirring motor. The screw motor and the stirring motor are mounted on the weighing platform in a relatively fixed manner, and the distance between the output shafts of the screw motor and the stirring motor is a fixed value.

[0012] Furthermore, the single-screw module and the twin-screw module have ball hoppers of the same model; the bottom end of the ball hopper is connected to a material cylinder tube, one end of the material cylinder tube is connected to a gearbox, and the other end is connected to a discharge pipe. The ball hopper is provided with a stirring shaft sleeve that cooperates with the output shaft of the stirring motor, and the gearbox is provided with a connecting end that cooperates with the output shaft of the screw motor (it can be understood that the distance between the stirring shaft sleeve and the connecting end should be matched with the distance between the output shafts of the screw motor and the stirring motor).

[0013] Furthermore, the twin-screw module includes a twin-helix feed rod rotatably disposed inside the barrel. The gearbox is provided with a driving gear and a driven gear. There are two driven gears. The driving gear meshes with the two driven gears respectively. The two driven gears are symmetrically disposed on both sides of the driving gear. The two driven gears are respectively connected to one feed screw of the twin-helix feed rod.

[0014] Furthermore, the single screw module includes a single spiral feed rod rotatably disposed inside the barrel, and the gearbox is provided with a driving gear and a driven gear, the driven gear being arranged longitudinally and connected to the single feed screw.

[0015] Furthermore, the center distance between the driving gear and the driven gear in the twin-screw module ; In the formula: z1 is the number of teeth on the driving gear; z2 is the number of teeth on the driven gear; m is the module of the driving gear and the driven gear; The screw motor output end is connected to a drive gear, and the stirring motor output end is connected to a stirring shaft; the center distance between the stirring shaft and the drive gear is... ; In the formula: d is the outer diameter of the double-helix feed rod; di is the inner diameter of the sphere; A is the center distance of the twin-helix feed rods.

[0016] Furthermore, the center distance between the stirring shaft and the drive gear in the single screw module... ; In the formula: d1 is the outer diameter of the helix of the single screw module; B1 is the center distance between the driving gear and the driven gear of the single screw module.

[0017] Furthermore, the gearbox includes a drive shaft and a driven shaft, and an end face seal is provided on one side of the gearbox. The drive shaft and the driven shaft are provided with shaft end seals at their protruding ends from the gearbox, so that a sealed oil cavity is formed inside the gearbox.

[0018] The advantages and beneficial effects of this invention are as follows: 1. The flexibility of dual-use: By designing the single-screw module and the twin-screw module as replaceable independent units, users do not need to purchase two additional machines. They can switch between "precision metering of granules" (single screw) and "precision metering of powder" (twin screw) working conditions simply by changing the module. This reduces equipment costs by more than 50%, making it especially suitable for small and medium-sized production enterprises.

[0019] 2. The weighing platform, screw motor, and stirring motor in the main structure remain fixed. Only modular components including the gearbox, screw, and ball hopper need to be replaced, which greatly reduces the amount of repetitive design and manufacturing work and reduces maintenance costs.

[0020] 3. The distance between the output shafts of the screw motor and the agitator motor (i.e., the center distance Hb between the agitator shaft and the drive gear) remains a fixed value. Regardless of whether a single or twin screw module is installed, the coaxiality and torque transmission stability of the transmission system can be ensured, avoiding poor sealing due to module replacement and material leakage from the equipment.

[0021] 4. The gearbox adopts a combination of end face seal and shaft end seal to form a fully enclosed oil chamber, which effectively prevents dust intrusion and lubricating oil leakage. It is especially suitable for pharmaceutical, food and other scenarios with high cleanliness requirements, and the maintenance cycle is extended by more than 30%. Attached Figure Description

[0022] Figure 1 This is an isometric drawing of a single- and double-screw interchangeable loss-in-weight scale according to the present invention; Figure 2 This is an exploded view of a single-screw and twin-screw interchangeable loss-in-weight scale according to the present invention; Figure 3 This is an exploded view of the twin-screw module of the present invention; Figure 4 This is an exploded view of the single-screw module of the present invention; Figure 5 This is one of the side views of the twin-screw module in this invention; Figure 6 This is the second side view of the twin-screw module in this invention; In the diagram: 1. Main structure; 2. Single screw module; 3. Twin screw module; 4. Weighing platform; 5. Hopper; 6. Screw motor; 7. Agitator motor; 8. Ball hopper; 9. Material cylinder tube; 10. Gearbox; 11. Discharge pipe; 12. Agitator shaft sleeve; 13. Connecting end; 14. Double helical feed rod; 15. Drive gear; 16. Driven gear; 17. Single helical feed rod; 18. Drive shaft; 19. Driven shaft; 20. End face seal; 21. Shaft end seal; 22. Oil chamber; 23. Vertical frame; 24. Agitator paddle; 25. Vertical plate; 26. Agitator shaft; 27. Circular sealing plate; 28. Pipe clamp. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] A single-screw and twin-screw interchangeable loss-in-weight scale includes a main structure 1 of the loss-in-weight scale and a single-screw module 2 and a twin-screw module 3. The single-screw module 2 and the twin-screw module 3 can be interchangeably combined with the main structure 1 to form a single-screw loss-in-weight scale or a twin-screw loss-in-weight scale, respectively.

[0025] like Figure 1 , 2As shown, the main structure 1 is a shared part of the single and twin screw modules 3. It includes a weighing platform 4 at the bottom, on which a loss-in-weight scale for weighing is mounted. A support frame 23 is mounted on one side of the loss-in-weight scale; the weight of the support frame 23 does not act on the loss-in-weight scale. Control equipment such as an electrical box is mounted on the support frame 23. A hopper 5, a screw motor 6, and a stirring motor 7 are mounted on the loss-in-weight scale. A vertical plate is mounted on the loss-in-weight scale, with the screw motor 6 and stirring motor 7 fixed longitudinally on one side of the plate. The position of the two motors is fixed by the vertical plate, meaning the distance between the output shafts of the screw motor 6 and the stirring motor 7 is a fixed value. The other side of the vertical plate is used to mount two replaceable single and twin screw modules 3.

[0026] Both the single-screw module 2 and the twin-screw module 3, which are interchangeable, are equipped with ball hoppers 8. The ball hoppers 8 are of the same model, having the same inner diameter and the same position of the stirring shaft sleeve 12, allowing for interchangeable installation. During installation, both the single-screw module 2 and the twin-screw module 3 are fixed to the loss-in-weight scale. The upper opening of the ball hopper 8 connects to the cylindrical hopper 5. The upper opening of the ball hopper 8 and the lower opening of the hopper 5 can be connected using a clamp. After connection, the hopper 5 and the bottom module form an integral unit. The internal space of the hopper 5 and the ball hopper 8 serves as the container for the material to be weighed. The clamp connection between the ball hopper 8 and the hopper 5 facilitates convenient installation of the two modules on the main structure 1, thus enabling easy switching between single-screw and twin-screw operation.

[0027] Furthermore, the bottom end of the ball hopper 8 is connected to the material cylinder tube 9, which is horizontally positioned at the bottom of the ball hopper 8. The upper opening of the material cylinder tube 9 is connected to the bottom of the ball hopper 8, allowing the material in the ball hopper 8 to enter the material cylinder tube 9 through the opening. The material cylinder tube 9 is equipped with a screw feeder. When the screw feeder rotates, it can control the material to be fed evenly to the outside, thereby enabling accurate loss-in-weight weighing. One end of the material cylinder tube 9 is connected to a gearbox 10, and the other end is connected to a discharge pipe 11. The gearbox 10 is connected to a screw motor 6, thereby driving the screw feed rod to rotate at a set speed to control the discharge speed. The ball hopper 8 is equipped with a stirring shaft sleeve 12 that cooperates with the output shaft of the stirring motor 7. The stirring shaft is rotatably connected through the stirring shaft sleeve 12. The stirring shaft is designed to be detachable at both ends. One end is detachable from the stirring motor 7, and the other end is inserted into the ball hopper 8 to detachably install the stirring paddle 24. This allows for convenient disassembly and replacement when replacing the single or double screw modules 3. During replacement, disconnect the material hopper 5 connected to the ball hopper 8 and then remove the stirring paddle 24. The module can be disassembled and replaced by disconnecting the connecting bolts between the gearbox 10 and the material cylinder tube 9 and the weighing platform 4.

[0028] The gearbox 10 is equipped with a connection end 13 that mates with the output shaft of the screw motor 6. Since the screw motor 6 and gearbox 10 are designed as a single unit in the prior art, the connection does not require consideration of sealing after disassembly. In this design, the gearbox 10 must be completely disengaged from the screw motor 6, and the gears, lubricating oil, and other components inside the gearbox 10 must remain intact and not leak. Furthermore, such as... Figure 3 , 4 As shown, the gearbox 10 includes a drive shaft 18 and a driven shaft 19. An end face seal 20 is provided on one side of the gearbox 10. The drive shaft 18 and the driven shaft 19 are provided with shaft end seals 21 at their protruding ends from the gearbox 10, so that a sealed oil cavity 22 is formed inside the gearbox 10. A recessed groove is provided on one side of the gearbox 10. The recessed groove is used to install the drive shaft 18 and driven shaft 19 from its open side, and to install the drive gear 15 and driven gear 16 on the shaft. The driven gear 16 passes through the through hole at the bottom of the recessed groove and is used to connect with the screw feed rod. The bottom through hole is provided with a shaft end seal 21 for rotational sealing of the driven shaft 19. An end face seal 20 is provided on the open side of the recessed groove. In this embodiment, a circular sealing plate is specifically provided. The circular sealing plate has a through hole for the drive shaft 18 to pass through. The shaft end seal 21 for the drive shaft 18 is installed in the through hole. A sealing ring is provided in the pressing surface of the circular sealing plate and the recessed groove, so that the recessed groove and the circular sealing plate combine to form a sealed oil cavity 22. Lubricating oil can be injected into the oil cavity 22. In this way, after the single and twin screw modules 3 are disassembled, the gearbox 10 can be completely moved and replaced.

[0029] Specifically, the twin-screw module 3 includes a twin-helix feed rod 14 rotatably disposed inside the feed tube 9. The gearbox 10 is provided with a driving gear 15 and a driven gear 16. There are two driven gears 16. The driving gear 15 meshes with the two driven gears 16 respectively, and the two driven gears 16 are symmetrically disposed on both sides of the driving gear 15. The two driven gears 16 are respectively connected to one feed screw of the twin-helix feed rod 14.

[0030] Furthermore, the single screw module 2 includes a single spiral feed rod 17 rotatably disposed inside the feed tube 9, and the gearbox 10 is provided with a driving gear 15 and a driven gear 16. The driven gear 16 is arranged longitudinally and is connected to the single feed screw.

[0031] Example 1: T28 Circular Sealing Plate Model Twin Screw Module 3: Specifically, such as Figure 5 , 6As shown, to ensure that each module can be installed in conjunction with the main structure 1, the known parameters of the main structure 1 are the center distance Hb between the stirring shaft and the drive gear 15. In actual design, if the value of Hb is known, the applicable parameters for the twin helix of the twin-screw module 3 can be calculated based on the known Hb value, specifically including the center distance A of the twin helix and the outer diameter d of the helix. Conversely, if the parameters of the twin helix, drive gear 15, and driven gear 16 are selected and finalized first, the corresponding Hb value can be calculated based on the selected parameters, thus making the main structure 1 compatible with both single and twin-screw modules 3. Furthermore, based on the Hb value and the relevant parameters of the twin helix, the specifications of the stirring paddle 24 can be selected to make it as close as possible to the inner wall of the ball hopper 8 for stirring. And because the stirring paddle 24 is selected based on the calculated values, the stirring paddle 24 will not interfere with the twin helix when rotating.

[0032] This embodiment takes the selection of double helix parameters first, and then the calculation of Hb value as an example.

[0033] Specific parameters also include that the inner diameter di of the ball bucket 8 is 350mm, the number of teeth z1 of its driving gear 15 is 25, and the module m is 1.5; the number of teeth z2 of its driven gear 16 is 16, and the module m is 1.5.

[0034] Then, the center distance B between the driving gear and the driven gear in the twin-screw module is further calculated. In the formula: z1 is the number of teeth on the driving gear; z2 is the number of teeth on the driven gear; m is the module of the driving gear and the driven gear; Substituting the relevant data into the formula, we get B = 30.75 mm; In this embodiment, the order of first selecting the double helix and then calculating Hb is as follows: the specific design of the double helix is: center distance A = 28mm, helix outer diameter d = 35mm; The screw motor output end is connected to the drive gear, and the stirring motor output end is connected to the stirring shaft; the center distance between the stirring shaft and the drive gear is... ; In the formula: d is the outer diameter of the double-helix feed rod; di is the inner diameter of the sphere; A is the center distance of the twin-helix feed rods.

[0035] Hb=165.1218609mm.

[0036] Furthermore, we calculate the relevant parameters of the single-screw module corresponding to the T28 model twin-screw module. Since the Hb value must remain constant in both single and twin-screw modules, we can derive the parameters of the single-screw module based on this equality relationship.

[0037] Furthermore, the center distance between the stirring shaft and the drive gear in the single screw module... ; In the formula: d1 is the outer diameter of the helix of the single screw module; B1 is the center distance between the driving gear and the driven gear of the single screw module.

[0038] Based on the above formula, we can derive: Single screw helix outer diameter: ; Furthermore, we will select the appropriate parameters for the single-screw gear: Number of teeth on the driving gear: z1 = 24 (close to the number of teeth on the driving gear of the twin-screw screw, maintaining a similar transmission ratio); Number of teeth on the driven gear: z2 = 18 (to ensure smooth transmission); Module: m = 1.5 (consistent with the twin-screw module to simplify manufacturing).

[0039] It is understood that the above selection is not unique. Those skilled in the art can modify the selection according to the desired gear parameters or screw speed and other parameter requirements, and then perform adaptation calculations.

[0040] Calculate the B1 value: B1=(24+18)×1.5 / 2=31.5mm.

[0041] Calculate the outer diameter d1 of the single screw: ; Substituting the data, we calculate d1 = 43.244 mm.

[0042] Example 2: T38 twin-screw module: This embodiment also takes the example of first selecting the parameters of the double helix and then calculating the Hb value.

[0043] The specific parameters are, for example Figure 5 , 6 As shown, the inner diameter di of the ball is 400mm, the number of teeth z1 of its driving gear is 34, and the module m is 1.5; the number of teeth z2 of its driven gear is 23, and the module m is 1.5. The specific design of the double helix is ​​as follows: center distance A = 38mm, helix outer diameter d = 43mm; Then, the center distance B between the driving gear and the driven gear in the twin-screw module is further calculated. In the formula: z1 is the number of teeth on the driving gear; z2 is the number of teeth on the driven gear; m is the module of the driving gear and the driven gear; Substituting the relevant data into the formula, we obtain B = 42.75 mm; The screw motor output end is connected to the drive gear, and the stirring motor output end is connected to the stirring shaft; the center distance between the stirring shaft and the drive gear is... ; In the formula: d is the outer diameter of the double-helix feed rod; di is the inner diameter of the sphere; A is the center distance of the twin-helix feed rods.

[0044] Hb = 183.2042757 mm.

[0045] Furthermore, we calculate the relevant parameters of the single-screw module corresponding to the T38 model twin-screw module. Since the Hb value must remain constant in both single and twin-screw modules, we can derive the parameters of the single-screw module based on this equality relationship.

[0046] Furthermore, the center distance between the stirring shaft and the drive gear in the single screw module... ; In the formula: d1 is the outer diameter of the helix of the single screw module; B1 is the center distance between the driving gear and the driven gear of the single screw module.

[0047] Based on the above formula, we can derive: Single screw helix outer diameter: ; Furthermore, we will select the appropriate parameters for the single-screw gear: Number of teeth on the driving gear: z1 = 32; Number of teeth on the driven gear: z2 = 24; Modulus: m = 1.5.

[0048] It is understood that the above selection is not unique. Those skilled in the art can modify the selection according to the desired gear parameters or screw speed and other parameter requirements, and then perform adaptation calculations.

[0049] Calculate the B1 value: B1=42mm.

[0050] Calculate the outer diameter d1 of the single screw: ; Substituting the data, we calculate d1 = 50.409 mm.

[0051] Understandably, the parameters of the single-screw module can be calculated first, and then the relevant parameters of the twin-screw module can be derived based on the above calculation formula. In other words, either the single-screw module or the twin-screw module can be calculated first, and then the other can be calculated based on the relationship, so that the two modules can be interchanged and installed on the main structure.

[0052] Example 3: T46 twin-screw module: This embodiment also takes the example of first selecting the parameters of the double helix and then calculating the Hb value.

[0053] The specific parameters are as follows: the inner diameter di of the ball is 500mm; the number of teeth z1 of its driving gear is 23, and the module m is 2; the number of teeth z2 of its driven gear is 23, and the module m is 2. The specific design of the double helix is ​​as follows: center distance A = 46mm, helix outer diameter d = 58mm; Then, the center distance B between the driving gear and the driven gear in the twin-screw module is further calculated. In the formula: z1 is the number of teeth on the driving gear; z2 is the number of teeth on the driven gear; m is the module of the driving gear and the driven gear; Substituting the relevant data into the formula, we calculate B = 46 mm; The screw motor output end is connected to the drive gear, and the stirring motor output end is connected to the stirring shaft; the center distance between the stirring shaft and the drive gear is... ; In the formula: d is the outer diameter of the double-helix feed rod; di is the inner diameter of the sphere; A is the center distance of the twin-helix feed rods.

[0054] Hb = 239.1628314 mm.

[0055] Furthermore, we calculate the relevant parameters of the single-screw module corresponding to the T46 model twin-screw module. Since the Hb value must remain constant in both single and twin-screw modules, we can derive the parameters of the single-screw module based on this equality relationship.

[0056] Furthermore, the center distance between the stirring shaft and the drive gear in the single screw module... ; In the formula: d1 is the outer diameter of the helix of the single screw module; B1 is the center distance between the driving gear and the driven gear of the single screw module.

[0057] Based on the above formula, we can derive: Single screw helix outer diameter: ; Furthermore, we will select the appropriate parameters for the single-screw gear: Number of teeth on the driving gear: z1 = 22; Number of teeth on the driven gear: z2 = 24; Modulus: m = 2.

[0058] It is understood that the above selection is not unique. Those skilled in the art can modify the selection according to the desired gear parameters or screw speed and other parameter requirements, and then perform adaptation calculations.

[0059] Calculate the B1 value: B1=46mm.

[0060] Calculate the outer diameter d1 of the single screw: ; Substituting the data, we calculate d1 = 70.325 mm.

[0061] Parameter table of various twin-screw modules Parameter table of single screw modules for each model The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made 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 single-screw and twin-screw interchangeable loss-in-weight scale, characterized in that, It includes the main structure of the loss-in-weight scale and single-screw modules and twin-screw modules. The single-screw modules and twin-screw modules can be interchanged and combined with the main structure to form a single-screw loss-in-weight scale or a twin-screw loss-in-weight scale, respectively. The single-screw module and the twin-screw module have the same type of ball bucket; the bottom of the ball bucket is connected to the material barrel tube, one end of the material barrel tube is connected to a gearbox, and the other end is connected to the discharge pipe; the gearbox is provided with a connecting end that cooperates with the output shaft of the screw motor; The twin-screw module includes a twin-helix feed rod rotatably disposed inside the barrel. The gearbox is provided with a driving gear and a driven gear. There are two driven gears. The driving gear meshes with the two driven gears respectively. The two driven gears are symmetrically disposed on both sides of the driving gear. The two driven gears are respectively connected to one of the feed screws of the twin-helix feed rod. The center distance between the driving gear and the driven gear in the twin-screw module ; In the formula: z1 is the number of teeth on the driving gear; z2 is the number of teeth on the driven gear; m is the module of the driving gear and the driven gear; The screw motor output end is connected to the drive gear, and the stirring motor output end is connected to the stirring shaft; the distance between the output shafts of the screw motor and the stirring motor is a fixed value; Center distance between the stirring shaft and the drive gear ; In the formula: d is the outer diameter of the double-helix feed rod; di is the inner diameter of the sphere; A is the center distance of the twin-helix feed rods.

2. The single / twin screw interchangeable loss-in-weight scale according to claim 1, characterized in that, The main structure includes a weighing platform, a screw motor, and a stirring motor, with the screw motor and stirring motor mounted on top of the weighing platform in a relatively fixed manner.

3. The single / twin screw interchangeable loss-in-weight scale according to claim 2, characterized in that, The ball hopper is equipped with a stirring shaft sleeve that mates with the output shaft of the stirring motor.

4. A single / twin screw interchangeable loss-in-weight scale according to claim 3, characterized in that, The single screw module includes a single spiral feed rod that is rotatably disposed inside the material barrel. The gearbox is provided with a driving gear and a driven gear. The driven gear is arranged longitudinally and is connected to the single feed screw.

5. A single / twin screw interchangeable loss-in-weight scale according to claim 4, characterized in that, The center distance between the stirring shaft and the drive gear in the single screw module ; In the formula: d1 is the outer diameter of the helix of the single screw module; B1 is the center distance between the driving gear and the driven gear of the single screw module.

6. A single / twin screw interchangeable loss-in-weight scale according to claim 3, characterized in that, The gearbox includes a drive shaft and a driven shaft. An end face seal is provided on one side of the gearbox, and shaft end seals are provided at the ends of the drive shaft and driven shaft extending from the gearbox, so that a sealed oil cavity is formed inside the gearbox.

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