An electrical control system for a powder rotary packer

Abstract

The application provides an electrical control system of a powder rotary packaging machine, the electrical control system of the powder rotary packaging machine, the electrical control system comprising a PLC body, the PLC body being used for receiving a position signal output by a position sensor, a weight signal output by a weighing sensor, and a signal detected by a packaging bag detector and a telescopic bag presser and indicating whether a packaging bag is in place and pressed, the electrical control system further comprising a rotation control subsystem, a feeding control subsystem, a discharging control subsystem and a weighing control subsystem which are connected with the PLC body respectively. The application mainly aims at the powder rotary packaging machine, and efficiently and accurately controls a rotation assembly, a feeding device, a discharging device and a weighing device of the powder packaging machine, so that the powder packaging machine can orderly carry out bag pressing, material conveying, weighing and bag taking, and the automation degree of the powder packaging machine and the working efficiency of the packaging machine are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging machinery, and in particular to an electrical control system of a powder rotary packaging machine. Background Art

[0002] Powder packaging equipment is primarily used for the automated packaging of high-flow powders such as cement, dry mortar, and putty powder. Powder is typically conveyed into bags through extrusion or other methods. Currently, to improve packaging efficiency, powder packaging equipment often consists of multiple single-discharge packaging machines arranged side by side. This requires a large footprint, and each single-discharge packaging machine requires a discharging drive. This complex structure results in poor production continuity, hinders energy conservation, and increases manufacturing costs. Furthermore, existing powder packaging machines are generally semi-automatic, requiring manual bag placement and removal after loading. This results in slow packaging speeds and low efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide an electrical control system for a powder rotary packaging machine, which is mainly aimed at the powder rotary packaging machine. It efficiently and accurately controls the rotating assembly, feeding device, discharging device and weighing device of the powder packaging machine, so that it can press bags, feed materials, weigh and take bags in an orderly manner, effectively improving the degree of automation of the powder packaging machine and the working efficiency of the packaging machine.

[0004] The embodiment of the present invention is achieved as follows:

[0005] The present invention provides an electrical control system for a powder rotary packaging machine, the powder rotary packaging machine includes a machine base, a rotating assembly, a feeding device, a discharging device, and a weighing device; a position sensor is provided on the machine base, the rotating assembly includes a rotating motor that drives the feeding device, the discharging device, and the weighing device to rotate as a whole on the machine base; the feeding device includes a feeding drive motor that drives the rotating blades in the feeding barrel to convey the material to the feeding pipe, a feeding air nozzle, a regulating valve, and a feeding air valve that controls the feeding air nozzle on the feeding pipe; there are multiple discharging devices, and an even number of processing devices are distributed around the feeding device, the processing device includes a discharging air nozzle on the discharging pipe, a discharging air valve that controls the discharging air nozzle, an air return pipe, a negative pressure return air valve that controls the return air pipe, a packaging bag detector, and a telescopic bag press; the weighing device is arranged corresponding to the discharging device, the weighing device includes a weighing sensor, a lifting cylinder that controls the lifting of the bag frame, and a bag pushing cylinder that controls the flipping of the bag frame, and the position sensor is used to sense whether the corresponding weighing device has rotated to the corresponding position of the machine base;

[0006] The electrical control system includes a PLC body, which is used to receive the position signal output by the position sensor, the weight signal output by the weighing sensor, and the signal of whether the packaging bag is in place and pressed detected by the packaging bag detector and the telescopic bag presser. The electrical control system also includes a rotation control subsystem, a feeding control subsystem, a discharging control subsystem and a weighing control subsystem respectively connected to the PLC body.

[0007] Furthermore, the rotation control subsystem is used to control the switch and speed of the rotating motor. When it receives the start signal from the PLC body, it outputs a start signal to the rotating motor. When it receives the shutdown signal from the PLC body, it outputs a shutdown signal to the rotating motor. At the same time, it controls the rotation speed of the rotating motor according to the speed signal sent by the PLC body.

[0008] Furthermore, the feeding control subsystem includes a feeding drive control module, a feeding air valve control module and a regulating valve control module;

[0009] The feeding drive control module is used to control the switch and speed of the feeding drive motor. When it receives the start signal from the PLC body, it outputs a start signal to the feeding drive motor. When it receives the close signal from the PLC body, it outputs a shutdown signal to the feeding drive motor. At the same time, it controls the rotation speed of the feeding drive motor according to the speed signal sent by the PLC body.

[0010] Furthermore, the regulating valve control module is used to control the opening and closing and opening size of the regulating valve. When the PLC body receives the information sent by the packaging bag detector and the telescopic bag press and the packaging bag is inserted into place and pressed on the discharge pipe, the regulating valve control module controls the regulating valve to open to the maximum, and then controls the size of the regulating valve according to the weight signal of the weighing sensor. When the weight signal is close to the preset value, the opening amount of the regulating valve is reduced. When the weight signal reaches the preset value, the regulating valve is closed.

[0011] Furthermore, the feeding air valve control module is used to control the opening and closing of the feeding air valve. When the powder is conveyed to the packaging bag through the feeding pipe, the feeding air valve is controlled to open, and when the weight signal of the weighing sensor reaches a preset value, the feeding air valve is closed.

[0012] Furthermore, the discharge control subsystem includes a discharge air valve control module, a negative pressure return air valve control module, and a telescopic bag pressing device control module;

[0013] The discharge valve control module is used to control the opening and closing of the discharge valve. When the powder is conveyed to the packaging bag through the discharge pipe, the discharge valve is controlled to open. When the weight signal of the weighing sensor reaches a preset value, the discharge valve is closed.

[0014] Furthermore, the negative pressure return air valve control module is used to control the opening and closing of the negative pressure return air pipe. When the powder is transported to the packaging bag through the discharge pipe, the negative pressure return air valve is controlled to open. When the weight signal of the weighing sensor reaches a preset value, the negative pressure return air valve is closed.

[0015] Furthermore, the telescopic bag press control module is used to control the opening and closing of the telescopic bag press. When the packaging bag is inserted into the discharge pipe and the packaging bag detector detects that the packaging bag is in place, the telescopic bag press opens to press the packaging bag onto the discharge pipe. When the weight signal of the weighing sensor reaches a preset value, the telescopic bag press retracts to release the pressure on the packaging bag.

[0016] Furthermore, the weighing control subsystem includes a lifting cylinder control module and a bag pushing cylinder control module;

[0017] The lifting cylinder control module is used to control the lifting of the bag frame. According to the signal of the packaging bag size input by the staff received by the PLC, the extension length of the lifting cylinder is controlled to meet the support requirements of the packaging bag.

[0018] Furthermore, the bag pushing cylinder control module is used to control the flipping of the bag frame. When the weight signal of the weighing sensor reaches a preset value and the position sensor receives a signal that the corresponding weighing device has rotated into place, the bag pushing cylinder control module controls the flipping of the bag pushing cylinder to drive the bag frame to flip and pour out the packaging bag filled with powder.

[0019] The beneficial effects of the electrical control system of the powder rotary packaging machine provided by the present invention include:

[0020] 1. The electrical control system of the present invention is mainly used for powder rotary packaging machines. It efficiently and accurately controls the rotary assembly, feeding device, discharging device, and weighing device of the powder packaging machine, enabling it to carry out bag pressing, feeding, weighing, and bag removal in an orderly manner, effectively improving the degree of automation and working efficiency of the powder packaging machine.

[0021] 2. The electrical control system of the present invention performs overall control based on the position signal output by the position sensor, the weight signal output by the weighing sensor, and the signal of whether the packaging bag is in place and pressed detected by the packaging bag detector and the telescopic bag press, thereby ensuring the continuity of powder packaging and improving packaging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a three-dimensional schematic diagram of the powder rotary packaging machine of the present invention;

[0024] Figure 2 This is a functional block diagram of the electrical control system of the powder rotary packaging machine of the present invention;

[0025] Figure 3 This is a principle block diagram of the rotation control subsystem in the present invention;

[0026] Figure 4 This is a functional block diagram of the feeding control subsystem in the present invention;

[0027] Figure 5 This is a functional block diagram of the discharge control subsystem in the present invention;

[0028] Figure 6 This is a functional block diagram of the weighing control subsystem in the present invention;

[0029] Icons: 1. Machine base; 2. Rotating assembly; 3. Position sensor; 4. Feeding drive motor; 5. Feeding pipe; 6. Feeding air nozzle; 7. Regulating valve; 8. Discharge pipe; 9. Discharge air nozzle; 10. Return air pipe; 11. Bag detector; 12. Bag compressor; 13. Weighing sensor; 14. Lifting cylinder; 15. Bag pushing cylinder; 16. PLC body, 17. Bag frame. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0033] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0034] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] Example 1: Figure 1-6 As shown, the present invention provides an electrical control system for a powder rotary packaging machine, which includes a machine base 1, a rotating assembly 2, a feeding device, a discharging device, and a weighing device; a position sensor 3 is provided on the machine base 1, and the rotating assembly 2 includes a rotating motor that drives the feeding device, the discharging device, and the weighing device to rotate as a whole on the machine base 1; the feeding device includes a feeding drive motor 4 that drives the rotating blades in the feeding barrel to convey the material to the feeding pipe 5, a feeding air nozzle 6 on the feeding pipe 5, a regulating valve 7, and a feeding air valve that controls the feeding air nozzle 6; There are multiple discharging devices, and the even-numbered processing devices are evenly distributed around the feeding device. The processing device includes a discharging air nozzle 9 on the discharging pipe 8, a discharging air valve controlling the discharging air nozzle 9, a return air pipe 10, a negative pressure return air valve controlling the return air pipe 10, a packaging bag detector 11, and a telescopic bag presser; the weighing device is arranged corresponding to the discharging device, and the weighing device includes a weighing sensor 13, a lifting cylinder 14 controlling the lifting and lowering of the bag frame 17, and a bag pushing cylinder 15 controlling the flipping of the bag frame 17. The position sensor 3 is used to sense whether the corresponding weighing device has rotated to the corresponding position of the machine base 1;

[0036] The electrical control system includes a PLC body 16, which is used to receive the position signal output by the position sensor 3, the weight signal output by the weighing sensor 13, and the signal of whether the packaging bag is in place and pressed detected by the packaging bag detector 11 and the telescopic bag press. The electrical control system also includes a rotation control subsystem, a feeding control subsystem, a discharging control subsystem and a weighing control subsystem respectively connected to the PLC body 16.

[0037] The PLC body 16 performs a comprehensive comparison based on the position signal output by the position sensor 3, the weight signal output by the weighing sensor 13, and the signal of whether the packaging bag is in place and pressed detected by the packaging bag detector 11 and the telescopic bag presser, and sends corresponding signals to the corresponding rotation control subsystem, feeding control subsystem, discharging control subsystem and weighing control subsystem to control the corresponding rotating assembly 2, feeding device, discharging device and weighing device.

[0038] Example 2: Figure 3 As shown, based on the first embodiment, the rotation control subsystem is used to control the switch and speed of the rotating motor. When receiving the start signal of the PLC body 16, the start signal is output to the rotating motor. When receiving the shutdown signal of the PLC body 16, the shutdown signal is output to the rotating motor. At the same time, the rotation speed of the rotating motor is controlled according to the speed signal sent by the PLC body 16.

[0039] The PLC body 16 can preset the speed of the rotating motor and set it according to the capacity of the packaging bag, the feeding speed of the feeding device and the discharging device, etc.

[0040] Example 3: Figure 4 As shown, based on the first embodiment, the feeding control subsystem includes a feeding drive control module, a feeding air valve control module, and a regulating valve control module. The feeding drive control module is used to control the switching and speed of the feeding drive motor 4. When receiving the on signal from the PLC body 16, it outputs a start signal to the feeding drive motor 4. When receiving the off signal from the PLC body 16, it outputs a shut-down signal to the feeding drive motor 4. At the same time, according to the speed signal sent by the PLC body 16, it controls the rotation speed of the feeding drive motor 4. The regulating valve control module is used to control the opening and closing of the regulating valve 7 and the opening range. When the PLC body 16 receives the information sent by the packaging bag detector 11 and the telescopic bag presser that the packaging bag is inserted into the discharge pipe 8 and pressed, the regulating valve control module controls the regulating valve 7 to open to the maximum, and then controls the opening range of the regulating valve 7 according to the weight signal of the weighing sensor 13. When the weight signal approaches a preset value, it indicates that the powder in the packaging bag is about to reach the required weight, and the opening range of the regulating valve 7 is reduced. When the weight signal reaches the preset value, the regulating valve 7 is closed. The feeding air valve control module is used to control the opening and closing of the feeding air valve. When the powder is conveyed to the packaging bag through the feeding pipe 5, the feeding air valve is controlled to open. When the weight signal of the weighing sensor 13 reaches a preset value, the feeding air valve is closed.

[0041] The feeding control subsystem mainly includes a feeding drive control module for controlling the feeding drive motor 4, a feeding air valve control module for controlling the feeding air valve, and a regulating valve control module for controlling the regulating valve 7. It achieves the control of the feeding time and feeding speed of the feeding device.

[0042] Example 4: Figure 5 As shown, based on the first embodiment, the discharge control subsystem includes a discharge air valve control module, a negative pressure return air valve control module, and a retractable bag presser control module. The discharge air valve control module is used to control the opening and closing of the discharge air valve. When powder is conveyed to the packaging bag through the discharge pipe 8, the discharge air valve is controlled to open. When the weight signal of the weighing sensor 13 reaches a preset value, the discharge air valve is closed. The negative pressure return air valve control module is used to control the opening and closing of the negative pressure return air pipe 10. When powder is conveyed to the packaging bag through the discharge pipe 8, the negative pressure return air valve is controlled to open. When the weight signal of the weighing sensor 13 reaches a preset value, the negative pressure return air valve is closed. The retractable bag presser control module is used to control the opening and closing of the retractable bag presser. When the packaging bag is inserted into the discharge pipe 8 and the packaging bag detector 11 detects that the packaging bag is in place, the retractable bag presser opens to press the packaging bag against the discharge pipe 8. When the weight signal of the weighing sensor 13 reaches a preset value, the retractable bag presser retracts, releasing the pressure on the packaging bag.

[0043] The discharge control subsystem primarily includes a discharge valve control module, a negative pressure return valve control module, and a retractable bag presser control module. This module controls the opening and closing of the discharge nozzle 9 and return pipe 10, controls the air flow rate, and controls the expansion and contraction of the retractable bag presser, thereby tightening and releasing the packaging bag on the discharge pipe 8.

[0044] Example 5: Figure 6 As shown, based on the first embodiment, the weighing control subsystem includes a control module for the lifting cylinder 14 and a control module for the bag pushing cylinder 15. The lifting cylinder 14 control module is used to control the lifting and lowering of the bag frame 17. Based on the bag size signal input by the staff received by the PLC, the lifting cylinder 14 is controlled to extend and retract to meet the bag support requirements. The bag pushing cylinder control module is used to control the flipping of the bag frame 17. When the weight signal of the weighing sensor 13 reaches a preset value and the position sensor 3 receives a signal indicating that the corresponding weighing device has rotated into position, the bag pushing cylinder control module controls the flipping of the bag pushing cylinder 15, driving the bag frame 17 to flip and pour out the powder-filled bag.

[0045] The weighing control subsystem mainly includes the lifting cylinder 14 control module for controlling the lifting bag frame 17 and the bag pushing cylinder control module for controlling the bag flipping, thus achieving the support matching of bags of different heights and the flipping and unloading of the bags after packaging.

[0046] The main working process of the present invention is: the rotation control subsystem controls the rotating assembly 2 to drive the feeding device, the discharging device and the weighing device to rotate as a whole on the machine base 1, so that each discharging device on the feeding device is at a different work station and performs different process operations. First, the discharging device moves to the bag insertion position, and the packaging bag is inserted into the discharging pipe 8. After the packaging bag detector 11 detects that the packaging bag is in place, the telescopic bag pressing device control module controls the telescopic bag pressing device to work, compresses the packaging bag, and the discharging device continues to rotate. During the rotation process, the feeding control subsystem controls the feeding drive motor 4 to drive the feeding assembly to transport the powder into the feeding pipe 5 and the discharging pipe 8, thereby allowing the powder to enter the packaging bag. In this process, the compressed air valves of the feeding air nozzle 6 and the discharging air nozzle 9 are opened, and air is blown into the pipe to make it easier for the gas powder to enter the packaging bag. At the same time, the return air pipe 10 returns air to avoid the packaging bag from bulging. In the process of the powder entering the packaging bag, the weighing device continues to weigh it. When the powder just flows into the packaging bag, the regulating valve 7 can be fully opened to allow the powder to enter the packaging bag at the maximum flow rate. When the weight of the powder in the packaging bag is about to reach the preset weight, The regulating valve 7 is gradually closed, and the powder flow rate is controlled to gradually decrease, achieving refined control, so that the weight of the powder entering the packaging bag can be accurately controlled, ensuring that the weight specifications of the powder in each packaging bag are consistent, and ensuring the packaging quality; when the weighing device weighs the required weight, the regulating valve 7 is completely closed, and the weighing device is rotating with the feeding device. When the position sensor 3 on the machine base 1 detects that the weighing device has rotated into place, if the weight weighed by the weighing device also meets the requirements, the telescopic bag presser retracts and releases the packaging bag. Under the action of the bag pushing cylinder 15, the packaging bag flips over and separates from the weighing device to enter the next process; if the weighing device detects that the weight of the powder entering the packaging bag is insufficient, the packaging bag continues to rotate on the weighing device, and the feeding device continues to transport the material to it, and finally reaches the required weight. When it passes the position sensor 3 again, the packaging bag is separated.

[0047] The electrical control system of the present invention is mainly aimed at the powder rotary packaging machine. It efficiently and accurately controls the rotating assembly 2, feeding device, discharging device and weighing device of the powder packaging machine, so that it can press bags, transport materials, weigh and take bags in an orderly manner, effectively improving the degree of automation of the powder packaging machine and the working efficiency of the packaging machine; the electrical control system of the present invention is based on the position signal output by the position sensor 3, the weight signal output by the weighing sensor 13, and the signal of whether the packaging bag is in place and pressed detected by the packaging bag detector 11 and the telescopic bag presser, and performs overall control, thereby ensuring the continuity of powder packaging and improving packaging efficiency.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electrical control system for a powder rotary packaging machine, the powder rotary packaging machine comprising a machine base (1), a rotating assembly (2), a feeding device, a discharging device, and a weighing device; a position sensor (3) is provided on the machine base (1); the rotating assembly (2) comprises a rotating motor for driving the feeding device, the discharging device, and the weighing device to rotate as a whole on the machine base (1); the feeding device comprises a feeding drive motor (4) for driving a rotating blade in a feeding barrel to convey material to a feeding pipe (5), a feeding air nozzle (6) on the feeding pipe (5), a regulating valve (7), and a feeding air valve for controlling the feeding air nozzle (6); the discharging device There are multiple, even-numbered processing devices distributed around the feeding device, the processing devices including a discharge air nozzle (9) on the discharge pipe (8), a discharge air valve controlling the discharge air nozzle (9), a return air pipe (10), a negative pressure return air valve controlling the return air pipe (10), a packaging bag detector (11) and a telescopic bag presser; the weighing device is arranged corresponding to the discharge device, the weighing device including a weighing sensor (13), a lifting cylinder (14) controlling the lifting of the bag frame (17) and a bag pushing cylinder (15) controlling the flipping of the bag frame (17); the position sensor (3) is used to sense whether the corresponding weighing device has rotated to the position corresponding to the machine base (1); Its characteristics are: The electrical control system includes a PLC body (16), the PLC body (16) is used to receive a position signal output by a position sensor (3), a weight signal output by a weighing sensor (13), and a signal indicating whether the packaging bag is in place and pressed, detected by a packaging bag detector (11) and a telescopic bag presser. The electrical control system also includes a rotation control subsystem, a feeding control subsystem, a discharging control subsystem, and a weighing control subsystem, which are respectively connected to the PLC body (16); The feeding control subsystem includes a feeding drive control module, a feeding air valve control module and a regulating valve control module; the feeding drive control module is used to control the switch and speed of the feeding drive motor (4), and when receiving the opening signal of the PLC body (16), outputs a starting signal to the feeding drive motor (4); when receiving the closing signal of the PLC body (16), outputs a shutdown signal to the feeding drive motor (4), and at the same time controls the rotation speed of the feeding drive motor (4) according to the speed signal issued by the PLC body (16); The regulating valve control module is used to control the opening and closing and the opening size of the regulating valve (7). When the PLC body (16) receives the information sent by the packaging bag detector (11) and the telescopic bag presser that the packaging bag is inserted into the discharge pipe (8) and pressed, the regulating valve control module controls the regulating valve (7) to open to the maximum, and then controls the size of the regulating valve (7) according to the weight signal of the weighing sensor (13). When the weight signal approaches a preset value, the opening amount of the regulating valve (7) is reduced. When the weight signal reaches the preset value, the regulating valve (7) is closed. The weighing control subsystem includes a lifting cylinder control module and a bag pushing cylinder control module; the lifting cylinder control module is used to control the lifting and lowering of the bag frame (17), and controls the telescopic length of the lifting cylinder (14) according to the signal of the packaging bag size input by the staff received by the PLC to meet the support requirements of the packaging bag; The bag pushing cylinder control module is used to control the flipping of the bag frame (17). When the weight signal of the weighing sensor (13) reaches a preset value and the position sensor (3) receives a signal that the corresponding weighing device has rotated into position, the bag pushing cylinder control module controls the bag pushing cylinder (15) to flip and drive the bag frame (17) to flip, thereby pouring out the packaging bag filled with powder.

2. The electrical control system of the powder rotary packaging machine according to claim 1, characterized in that: The rotation control subsystem is used to control the switch and speed of the rotating motor. When receiving the start signal from the PLC body (16), the rotation control subsystem outputs a start signal to the rotating motor. When receiving the shutdown signal from the PLC body (16), the rotation control subsystem outputs a shutdown signal to the rotating motor. At the same time, the rotation speed of the rotating motor is controlled according to the speed signal sent by the PLC body (16).

3. The electrical control system of the powder rotary packaging machine according to claim 1, characterized in that: The feeding air valve control module is used to control the opening and closing of the feeding air valve. When the powder is conveyed to the packaging bag through the feeding pipe (5), the feeding air valve is controlled to open. When the weight signal of the weighing sensor (13) reaches a preset value, the feeding air valve is closed.

4. The electrical control system of the powder rotary packaging machine according to claim 1, characterized in that: The discharging control subsystem includes a discharging air valve control module, a negative pressure return air valve control module, and a telescopic bag pressing device control module; The discharge valve control module is used to control the opening and closing of the discharge valve. When the powder is transported to the packaging bag through the discharge pipe (8), the discharge valve is controlled to open. When the weight signal of the weighing sensor (13) reaches a preset value, the discharge valve is closed.

5. The electrical control system of the powder rotary packaging machine according to claim 4, characterized in that: The negative pressure return air valve control module is used to control the opening and closing of the negative pressure return air pipe (10). When the powder is transported to the packaging bag through the discharge pipe (8), the negative pressure return air valve is controlled to open. When the weight signal of the weighing sensor (13) reaches a preset value, the negative pressure return air valve is closed.

6. The electrical control system of the powder rotary packaging machine according to claim 4, characterized in that: The telescopic bag press control module is used to control the opening and closing of the telescopic bag press. When the packaging bag is inserted into the discharge pipe (8) and the packaging bag detector (11) detects that the packaging bag is in place, the telescopic bag press is opened to press the packaging bag onto the discharge pipe (8). When the weight signal of the weighing sensor (13) reaches a preset value, the telescopic bag press retracts to release the pressure on the packaging bag.

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