Screw down-pressure filling machine

Abstract

The utility model relates to the technical field of powder filling, in particular to a screw down-pressure filling machine which improves the filling efficiency while ensuring the filling precision, and is convenient to use and high in practicability. Comprising a baseplate; the device comprises a bottom plate and further comprises a pneumatic filling mechanism, a spiral filling mechanism, a rotating mechanism, a clamping mechanism and a weighing mechanism, the pneumatic filling mechanism and the spiral filling mechanism are installed on the left side and the right side of the bottom plate respectively, the pneumatic filling mechanism has the pneumatic filling function, and the spiral filling mechanism has the spiral conveying filling function. The weighing mechanism is located below the spiral filling mechanism, the clamping mechanism is installed on the bottom plate through the rotating mechanism, the clamping mechanism has the clamping and fixing functions, and the rotating mechanism is used for rotating the clamping mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of powder filling, in particular to a screw down pressure filling machine. Background Art

[0002] A powder filling machine is a machine used for filling powders, which is widely used in many fields such as food processing, pharmaceuticals and chemicals. In the prior art, a utility model patent with patent application number 202220412568.4 discloses an automatic powder material filling machine with quantitative discharging, which mainly includes a mixing box, a top cover is installed on the outside of the mixing box, a drive motor is installed on the outside of the top cover, a transmission rod is connected to the output shaft of the drive motor, a mixing blade and two connecting rods are installed on the outside of the transmission rod, an anti-blocking rod is installed at the bottom of the connecting rod, and a spiral discharging sheet is connected to the outside of the anti-blocking rod; when filling powder into the cylinder, the cylinder is placed under the mixing box, and then the anti-blocking is driven by the motor. The rod drives the spiral discharging piece to rotate, and the spiral discharging piece squeezes the powder in the mixing box during the rotation, and then squeezes the powder into the cylinder, so as to fill the powder into the cylinder. The inventor believes that there are the following problems during use. The powder is squeezed into the cylinder through the mixing box by the rotation of the spiral discharging piece. Although the filling is stable and the filling accuracy is high, the filling speed into the cylinder is slow and the filling efficiency is low. In the large-scale production process, it will seriously affect the production progress. Therefore, a filling machine is needed that can ensure the filling accuracy and have a high filling efficiency. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a screw down-pressure filling machine which improves the filling efficiency while ensuring the filling accuracy and is easy to use and highly practical.

[0004] The screw down pressure filling machine of the utility model comprises a bottom plate; it also comprises a pneumatic filling mechanism, a spiral filling mechanism, a rotating mechanism, a clamping mechanism and a weighing mechanism. The pneumatic filling mechanism and the spiral filling mechanism are respectively mounted on the left and right sides of the bottom plate. The pneumatic filling mechanism has the function of pneumatic filling, the spiral filling mechanism has the function of spiral conveying and filling, the weighing mechanism is located below the spiral filling mechanism, the clamping mechanism is mounted on the bottom plate through the rotating mechanism, the clamping mechanism has the function of clamping and fixing, and the rotating mechanism is used to rotate the clamping mechanism; when filling powder into the cylinder, the cylinder is first clamped and fixed by the clamping mechanism, and then the cylinder is clamped and fixed by the pneumatic The pneumatic filling mechanism fills most of the powder into the cylinder, and then the rotating mechanism drives the clamping mechanism to drive the cylinder filled with powder to rotate above the weighing mechanism, and then the clamping mechanism is released to make the cylinder filled with most of the powder fall onto the weighing mechanism, and then the remaining powder is filled into the cylinder through the spiral filling mechanism. After the value displayed on the weighing mechanism reaches the specified value, the spiral filling mechanism can be closed; it fills most of the powder into the cylinder through the pneumatic filling mechanism to ensure the high efficiency of filling, and the filling efficiency is high; the spiral filling mechanism ensures the filling accuracy for the final quantitative filling of the cylinder, which is easy to use and highly practical.

[0005] Preferably, the rotating mechanism includes an electric turntable and a rotating shaft, the electric turntable is fixedly mounted on the upper end of the bottom plate, the rotating shaft is fixedly mounted on the rotating end of the upper part of the electric turntable, and the clamping mechanism is mounted on the rotating shaft; after the pneumatic filling mechanism has filled most of the powder into the cylinder, the electric turntable is turned on, the electric turntable drives the rotating shaft to rotate, and the rotating shaft drives the cylinder to rotate to the bottom of the spiral filling mechanism through the clamping mechanism; this facilitates the movement of the cylinder and improves convenience.

[0006] Preferably, the clamping mechanism comprises a connecting plate, a fixed plate, a torque motor, a lead screw, two sets of sliding blocks and two sets of clamping plates, the connecting plate is fixedly mounted on the rotating shaft, the fixed plate is fixedly mounted on the connecting plate, the torque motor is fixedly mounted on the fixed plate, the lead screw is rotatably mounted on the fixed plate, the front and rear sides of the lead screw are respectively provided with external threads of opposite rotation directions, the input end of the lead screw is connected to the torque motor, the two sets of sliding blocks are respectively screwed on the front and rear sides of the lead screw, the two sets of sliding blocks are both slidably mounted on the fixed plate back and forth, and the two sets of clamping plates are respectively fixedly mounted on the two sets of sliding blocks; when clamping and fixing the cylinder, first place the cylinder between the two sets of clamping plates, and then turn on the torque motor, the torque motor drives the lead screw to rotate, and the rotating lead screw makes the two sets of clamping plates approach each other through the two sets of sliding blocks until the two sets of clamping plates clamp and fix the cylinder; since the distance between the two sets of clamping plates can be adjusted, it can clamp and fix cylinders of different diameters, which is easy to use, has low limitations and high practicality.

[0007] Preferably, the pneumatic filling mechanism includes a lifting mechanism, a powder storage tank A, a pneumatic powder delivery pump, a hose and a discharge pipe. The powder storage tank A is fixedly mounted on the upper end of the base plate, and the pneumatic powder delivery pump is fixedly mounted on the powder storage tank A. The input end of the pneumatic powder delivery pump is connected to the powder storage tank A, and the output end of the pneumatic powder delivery pump is connected to the discharge pipe through a hose. A valve is provided on the discharge pipe, and the discharge pipe is located above the clamping mechanism. The discharge pipe is mounted on the lifting mechanism, and the lifting mechanism is used to lift and lower the discharge pipe. When filling powder into the cylinder, after the cylinder is clamped and fixed by two sets of clamps, the pneumatic powder delivery pump is turned on, so that the powder in the powder storage tank A is filled into the cylinder in turn through the pneumatic powder delivery pump, the hose and the discharge pipe. Most of the powder can be quickly filled into the cylinder by pneumatic filling, thereby improving the filling efficiency.

[0008] Preferably, the lifting mechanism includes an electric slide rail and a sliding block, the electric slide rail is fixedly mounted on the bottom plate, the sliding block is mounted on the electric slide rail, the discharge pipe is fixedly mounted on the sliding block, and the electric slide rail is used to move the sliding block up and down; when filling powder into the cylinder through the discharge pipe, the electric slide rail is opened, and the electric slide rail lowers the discharge pipe through the sliding block until the lower end of the discharge pipe is close to the cylinder; during the process of filling powder, the discharge pipe is kept as close to the cylinder as possible, which reduces the sputtering of powder during the filling process and improves reliability.

[0009] Preferably, the weighing mechanism includes a hydraulic cylinder, a push rod, a support, a sliding column, a lifting plate and a weighing scale. The hydraulic cylinder is fixedly mounted on the upper end of the base plate, the lower end of the push rod is connected to the output end of the hydraulic cylinder, the support is fixedly mounted on the base plate, the lower part of the sliding column is slidably mounted on the support, the lifting plate is fixedly mounted on the upper end of the push rod and the sliding column, and the weighing scale is fixedly mounted on the upper end of the lifting plate; after most of the powder is filled into the cylinder through the discharge pipe, the cylinder is moved to the upper end of the weighing scale, and then the last powder is filled into the cylinder through the spiral filling mechanism, and the weight of the powder filled in the cylinder is obtained from the value on the weighing scale; at the same time, the hydraulic cylinder can be opened, and the hydraulic cylinder drives the lifting plate to drive the weighing scale to rise through the push rod, and the weighing scale drives the cylinder to rise until the cylinder rises to be close to the spiral filling mechanism, and then the last powder is quantitatively filled into the cylinder through the spiral filling mechanism.

[0010] Preferably, the spiral filling mechanism comprises a bracket, a powder storage tank B, a filling tube, a support plate, a servo motor and a screw. The powder storage tank B is fixedly mounted on the bottom plate through the bracket. A chamber is arranged in the powder storage tank B. A filling tube is arranged at the lower part of the powder storage tank B. The support plate is fixedly mounted on the upper end of the powder storage tank B. The servo motor is fixedly mounted on the upper end of the support plate. The screw is rotatably mounted on the support plate. The upper end of the screw is connected to the servo motor. The lower part of the screw is located in the filling tube. The filling tube is located above the weighing scale. A valve is arranged on the filling tube. When the remaining powder is filled into the cylinder, the cylinder filled with the powder is placed on the weighing scale, and then the servo motor is turned on. The servo motor drives the screw to rotate. During the rotation, the screw applies pressure to the powder in the powder storage tank B and the filling tube chamber, presses the powder out through the filling tube, and makes the powder fall into the cylinder. The powder is transported by the rotating extrusion of the screw, and the filling accuracy is higher, the filling is stable, the use is convenient, and the practicability is high.

[0011] Compared with the prior art, the utility model has the following beneficial effects: while ensuring the filling accuracy, the filling efficiency is improved, and the use is convenient and the practicability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a first axonometric structural schematic diagram of the utility model;

[0013] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0014] Figure 3 It is a structural diagram of the weighing mechanism;

[0015] Figure 4 It is a schematic diagram of the structure of the electric slide rail, hose and discharge pipe;

[0016] Figure 5 It is a structural diagram of the screw, servo motor and support plate;

[0017] Figure 6 It is a structural schematic diagram of the clamping mechanism.

[0018] Markings in the attached drawings: 1. Base plate; 2. Electric turntable; 3. Rotating shaft; 4. Connecting plate; 5. Fixed plate; 6. Torque motor; 7. Screw; 8. Sliding block; 9. Clamp; 10. Powder storage tank A; 11. Pneumatic powder delivery pump; 12. Hose; 13. Discharge pipe; 14. Electric slide rail; 15. Sliding block; 16. Hydraulic cylinder; 17. Push rod; 18. Support column; 19. Sliding column; 20. Lifting plate; 21. Weighing scale; 22. Powder storage tank B; 23. Filling pipe; 24. Support plate; 25. Servo motor; 26. Cylinder; 27. Screw. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] Example 1

[0021] like Figures 1 to 6 The utility model of the screw down pressure filling machine comprises a bottom plate 1, a pneumatic filling mechanism, a spiral filling mechanism, a rotating mechanism, a clamping mechanism and a weighing mechanism. The pneumatic filling mechanism and the spiral filling mechanism are respectively installed on the left and right sides of the bottom plate 1. The pneumatic filling mechanism has the function of pneumatic filling, the spiral filling mechanism has the function of spiral conveying and filling, the weighing mechanism is located below the spiral filling mechanism, the clamping mechanism is installed on the bottom plate 1 through the rotating mechanism, the clamping mechanism has the function of clamping and fixing, and the rotating mechanism is used to rotate the clamping mechanism; when filling the powder into the cylinder 26, the cylinder 26 is first clamped and fixed by the clamping mechanism, and then the pneumatic filling machine is used to fill the powder into the cylinder 26. The cylinder 26 is filled with most of the powder, and then the clamping mechanism drives the cylinder 26 filled with the powder to rotate to the top of the weighing mechanism through the rotating mechanism, and then the clamping mechanism is released to make the cylinder 26 filled with most of the powder fall onto the weighing mechanism, and then the remaining powder is filled into the cylinder 26 through the spiral filling mechanism. After the value displayed on the weighing mechanism reaches the specified value, the spiral filling mechanism can be closed; the cylinder 26 is filled with most of the powder through the pneumatic filling mechanism, which ensures the high efficiency of filling, and the filling efficiency is high; the spiral filling mechanism ensures the accuracy of filling for the final quantitative filling of the cylinder 26, which is easy to use and highly practical.

[0022] like Figure 1 and Figure 2 The rotating mechanism includes an electric turntable 2 and a rotating shaft 3. The electric turntable 2 is fixedly mounted on the upper end of the bottom plate 1, the rotating shaft 3 is fixedly mounted on the rotating end of the upper part of the electric turntable 2, and the clamping mechanism is mounted on the rotating shaft 3. After the pneumatic filling mechanism has filled most of the powder into the cylinder 26, the electric turntable 2 is opened, the electric turntable 2 drives the rotating shaft 3 to rotate, and the rotating shaft 3 drives the cylinder 26 to rotate to the bottom of the spiral filling mechanism through the clamping mechanism; the movement of the cylinder 26 is facilitated and the convenience is improved.

[0023] like Figure 2 and Figure 6The clamping mechanism includes a connecting plate 4, a fixed plate 5, a torque motor 6, a lead screw 7, two sets of sliding blocks 8 and two sets of clamping plates 9. The connecting plate 4 is fixedly mounted on the rotating shaft 3, the fixed plate 5 is fixedly mounted on the connecting plate 4, the torque motor 6 is fixedly mounted on the fixed plate 5, the lead screw 7 is rotatably mounted on the fixed plate 5, the front and rear sides of the lead screw 7 are respectively provided with external threads with opposite rotation directions, the input end of the lead screw 7 is connected to the torque motor 6, the two sets of sliding blocks 8 are respectively screwed on the front and rear sides of the lead screw 7, and the two sets of sliding blocks 8 are both slidably mounted on the fixed plate 5. On the fixed plate 5, two groups of clamping plates 9 are respectively fixedly installed on two groups of sliding blocks 8; when clamping and fixing the cylinder 26, first place the cylinder 26 between the two groups of clamping plates 9, then turn on the torque motor 6, the torque motor 6 drives the screw 7 to rotate, and the rotating screw 7 makes the two groups of clamping plates 9 approach each other through the two groups of sliding blocks 8 until the two groups of clamping plates 9 clamp and fix the cylinder 26; since the distance between the two groups of clamping plates 9 can be adjusted, it can clamp and fix cylinders 26 of different diameters, which is easy to use, has low limitations and high practicality.

[0024] like Figure 1 The pneumatic filling mechanism includes a lifting mechanism, a powder storage tank A10, a pneumatic powder delivery pump 11, a hose 12 and a discharge pipe 13. The powder storage tank A10 is fixedly mounted on the upper end of the bottom plate 1, and the pneumatic powder delivery pump 11 is fixedly mounted on the powder storage tank A10. The input end of the pneumatic powder delivery pump 11 is connected to the powder storage tank A10, and the output end of the pneumatic powder delivery pump 11 is connected to the discharge pipe 13 through the hose 12. A valve is provided on the discharge pipe 13, and the discharge pipe 13 is located at the clamping machine The discharge pipe 13 is installed on the upper part of the structure, and the lifting mechanism is used to lift the discharge pipe 13; when filling powder into the cylinder 26, the cylinder 26 is clamped and fixed by two sets of clamps 9, and then the pneumatic powder delivery pump 11 is turned on to make the powder in the powder storage tank A10 be filled into the cylinder 26 in sequence through the pneumatic powder delivery pump 11, the hose 12 and the discharge pipe 13; most of the powder can be quickly filled into the cylinder 26 by pneumatic filling, thereby improving the filling efficiency.

[0025] like Figure 1 The lifting mechanism includes an electric slide rail 14 and a sliding block 15. The electric slide rail 14 is fixedly installed on the bottom plate 1, the sliding block 15 is installed on the electric slide rail 14, and the discharge pipe 13 is fixedly installed on the sliding block 15. The electric slide rail 14 is used to move the sliding block 15 up and down; when filling powder into the cylinder 26 through the discharge pipe 13, the electric slide rail 14 is opened, and the electric slide rail 14 lowers the discharge pipe 13 through the sliding block 15 until the lower end of the discharge pipe 13 is close to the cylinder 26; in the process of filling powder, the discharge pipe 13 is kept as close to the cylinder 26 as possible, which reduces the sputtering of powder during the filling process and improves reliability.

[0026] like Figure 3The weighing mechanism includes a hydraulic cylinder 16, a push rod 17, a support 18, a sliding column 19, a lifting plate 20 and a weighing scale 21. The hydraulic cylinder 16 is fixedly mounted on the upper end of the bottom plate 1, the lower end of the push rod 17 is connected to the output end of the hydraulic cylinder 16, the support 18 is fixedly mounted on the bottom plate 1, the lower part of the sliding column 19 is slidably mounted on the support 18, the lifting plate 20 is fixedly mounted on the upper ends of the push rod 17 and the sliding column 19, and the weighing scale 21 is fixedly mounted on the upper end of the lifting plate 20; after the filling is completed into the cylinder 26 through the discharge pipe 13 After most of the powder is filled, the cylinder 26 is moved to the upper end of the weighing scale 21, and then the last powder is filled into the cylinder 26 through the spiral filling mechanism. At the same time, the value on the weighing scale 21 can be used to know the weight of the powder filled in the cylinder 26; at the same time, the hydraulic cylinder 16 can be opened, and the hydraulic cylinder 16 drives the lifting plate 20 to drive the weighing scale 21 to rise through the push rod 17, and the weighing scale 21 drives the cylinder 26 to rise, until the cylinder 26 rises to be close to the spiral filling mechanism, and then the spiral filling mechanism is used to quantitatively fill the last powder into the cylinder 26.

[0027] like Figure 1 and Figure 5 The spiral filling mechanism includes a bracket, a powder storage tank B22, a filling tube 23, a support plate 24, a servo motor 25 and a screw 27. The powder storage tank B22 is fixedly mounted on the bottom plate 1 through the bracket. A chamber is provided in the powder storage tank B22. The lower part of the powder storage tank B22 is provided with a filling tube 23. The support plate 24 is fixedly mounted on the upper end of the powder storage tank B22. The servo motor 25 is fixedly mounted on the upper end of the support plate 24. The screw 27 is rotatably mounted on the support plate 24. The upper end of the screw 27 is connected to the servo motor 25. The lower part of the screw 27 is located in the filling tube 23. The filling tube 23 is located above the weighing scale 21, and a valve is provided on the filling tube 23; when the remaining powder is filled into the cylinder 26, the cylinder 26 filled with the powder is placed on the weighing scale 21, and then the servo motor 25 is turned on, and the servo motor 25 drives the screw 27 to rotate. During the rotation process, the screw 27 applies pressure to the powder storage tank B22 and the powder in the chamber of the filling tube 23, and presses the powder out through the filling tube 23, so that the powder falls into the cylinder 26; the powder is transported by the rotation and extrusion of the screw 27, and the filling accuracy is higher, the filling is stable, the use is convenient, and the practicability is high.

[0028] Example 2

[0029] On the basis of Example 1, the hydraulic cylinder 16, the push rod 17, the support 18 and the sliding column 19 can be replaced by a lifting platform, so that the lifting plate 20 can be installed on the base plate 1 through the lifting platform, and the lifting plate 20 can also be lifted and lowered through the lifting platform.

[0030] The electric turntable 2, torque motor 6, pneumatic powder delivery pump 11, electric slide rail 14, weighing scale 21 and servo motor 25 of the screw down pressure filling machine of the utility model are all purchased on the market. The technicians in this industry only need to install and operate them according to the accompanying instruction manual, without the need for the technicians in this field to make creative efforts.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A screw down pressure filling machine, comprising a bottom plate (1); characterized in that: It also comprises a pneumatic filling mechanism, a spiral filling mechanism, a rotating mechanism, a clamping mechanism and a weighing mechanism. The pneumatic filling mechanism and the spiral filling mechanism are respectively mounted on the left and right sides of the bottom plate (1). The pneumatic filling mechanism has a pneumatic filling function, the spiral filling mechanism has a spiral conveying filling function, the weighing mechanism is located below the spiral filling mechanism, the clamping mechanism is mounted on the bottom plate (1) via the rotating mechanism, the clamping mechanism has a clamping and fixing function, and the rotating mechanism is used to rotate the clamping mechanism.

2. A screw down pressure filling machine as claimed in claim 1, characterized in that: The rotating mechanism comprises an electric turntable (2) and a rotating shaft (3); the electric turntable (2) is fixedly mounted on the upper end of the base plate (1); the rotating shaft (3) is fixedly mounted on the rotating end of the upper part of the electric turntable (2); and the clamping mechanism is mounted on the rotating shaft (3).

3. A screw down pressure filling machine as claimed in claim 2, characterized in that: The clamping mechanism comprises a connecting plate (4), a fixed plate (5), a torque motor (6), a lead screw (7), two groups of sliding blocks (8) and two groups of clamping plates (9); the connecting plate (4) is fixedly mounted on the rotating shaft (3); the fixed plate (5) is fixedly mounted on the connecting plate (4); the torque motor (6) is fixedly mounted on the fixed plate (5); the lead screw (7) is rotatably mounted on the fixed plate (5); the front and rear sides of the lead screw (7) are respectively provided with external threads with opposite rotation directions; the input end of the lead screw (7) is connected to the torque motor (6); the two groups of sliding blocks (8) are respectively screwed to the front and rear sides of the lead screw (7); the two groups of sliding blocks (8) are both slidably mounted on the fixed plate (5) in a forward and backward manner; and the two groups of clamping plates (9) are respectively fixedly mounted on the two groups of sliding blocks (8).

4. A screw down pressure filling machine as claimed in claim 1, characterized in that: The pneumatic filling mechanism comprises a lifting mechanism, a powder storage tank A (10), a pneumatic powder delivery pump (11), a hose (12) and a discharge pipe (13). The powder storage tank A (10) is fixedly mounted on the upper end of the bottom plate (1). The pneumatic powder delivery pump (11) is fixedly mounted on the powder storage tank A (10). The input end of the pneumatic powder delivery pump (11) is connected to the powder storage tank A (10). The output end of the pneumatic powder delivery pump (11) is connected to the discharge pipe (13) through the hose (12). A valve is provided on the discharge pipe (13). The discharge pipe (13) is located above the clamping mechanism. The discharge pipe (13) is mounted on the lifting mechanism. The lifting mechanism is used to lift the discharge pipe (13).

5. A screw down pressure filling machine as claimed in claim 4, characterized in that: The lifting mechanism comprises an electric slide rail (14) and a sliding block (15); the electric slide rail (14) is fixedly mounted on the base plate (1); the sliding block (15) is mounted on the electric slide rail (14); the discharge pipe (13) is fixedly mounted on the sliding block (15); and the electric slide rail (14) is used to move the sliding block (15) up and down.

6. A screw down pressure filling machine as claimed in claim 1, characterized in that: The weighing mechanism comprises a hydraulic cylinder (16), a push rod (17), a support column (18), a sliding column (19), a lifting plate (20) and a weighing scale (21); the hydraulic cylinder (16) is fixedly mounted on the upper end of the base plate (1); the lower end of the push rod (17) is connected to the output end of the hydraulic cylinder (16); the support column (18) is fixedly mounted on the base plate (1); the lower part of the sliding column (19) is slidably mounted on the support column (18); the lifting plate (20) is fixedly mounted on the upper ends of the push rod (17) and the sliding column (19); and the weighing scale (21) is fixedly mounted on the upper end of the lifting plate (20).

7. A screw down pressure filling machine as claimed in claim 6, characterized in that: The spiral filling mechanism comprises a bracket, a powder storage tank B (22), a filling pipe (23), a support plate (24), a servo motor (25) and a screw (27); the powder storage tank B (22) is fixedly mounted on the bottom plate (1) through the bracket; a chamber is arranged in the powder storage tank B (22); the filling pipe (23) is arranged at the lower part of the powder storage tank B (22); the support plate (24) is fixedly mounted on the upper end of the powder storage tank B (22); the servo motor (25) is fixedly mounted on the upper end of the support plate (24); the screw (27) is rotatably mounted on the support plate (24); the upper end of the screw (27) is connected to the servo motor (25); the lower part of the screw (27) is located in the filling pipe (23); the filling pipe (23) is located above the weighing scale (21); and a valve is arranged on the filling pipe (23).

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