Double-swing-arm high-speed bagging device and control method

Abstract

A double-swing-arm high-speed bagging device includes an electronic scale 1, a transition hopper 2, a bag clamp 3, a material detection photoelectric sensor 4, a main swing arm 5, a secondary swing arm 6, and an electrical control system 7. The electronic scale 1 is located at the top of the device. The transition hopper 2 is located below the electronic scale 1, and its lower end is connected to the bag clamp 3. The bag clamp 3 has a horizontally illuminating material detection photoelectric sensor 4 near its lower outlet. The main swing arm 5 is located in front of the bag clamp 3, and the secondary swing arm 6 is located behind it. The electrical control system 7 includes a servo drive system that controls the operation of the main swing arm 5 and the secondary swing arm 6. The electrical control system 7 uses the feedback signal from the material detection photoelectric sensor 4 to coordinate and control all actions of the entire device. This invention utilizes the feedback signal from the material detection photoelectric sensor 4 to improve the packaging speed and accuracy of the packaging machine.

Description

Technical Field

[0001] This invention discloses a double-swing-arm high-speed bagging device and control method, belonging to the field of packaging machinery. Background Technology

[0002] Patent document CN202022321U discloses an electronic cam-type double swing arm mechanism. The movement speed of the auxiliary swing arm can be adjusted by modifying the electronic cam parameters, thereby achieving rapid shifting between empty and full bags, enabling the FFS packaging machine to achieve a higher packaging speed. However, since the main swing arm controls the operation of the auxiliary swing arm via an electronic cam, and the main swing arm itself has a relatively slow swing speed, this somewhat limits the auxiliary swing arm's working capacity. Furthermore, to achieve even higher packaging speeds, in addition to higher switching speeds for both the main and auxiliary swing arms, it is necessary to improve the close coordination between the main and auxiliary swing arms and the material falling and filling process, shorten the waiting time between the main and auxiliary swing arms and the material, and ensure that all material unloaded by the electronic scale is filled into empty bags each time. Only in this way can the overall packaging speed and accuracy of the FFS packaging machine be improved.

[0003] like Figure 2 The diagram shows the control logic timing of the existing electronic cam-type double swing arm packaging machine for unloading, bagging, and station switching, including the function of each action and the time required. When all the actions of each mechanism are normal, the time difference between waiting for the material to reach the bag opening after the empty bag is opened is Dt, and the control system cannot know the value of this Dt. In order to make the packaging machine run reliably and stably, a larger Dt value is obtained by adjusting T1 and T3. When the electronic scale unloads the second bag of material, due to electrical signals, pipeline air pressure fluctuations, mechanism actions, etc., the time T4(2) for the material to reach the bag clamp outlet is shorter than the preset time T4. The time for the material to be completely loaded into the empty bag is also shortened by Dt2 compared to the preset time. However, the main swing arm and the auxiliary swing arm still switch stations according to the preset time, and the speed of the packaging machine does not increase. When the electronic scale unloads the third bag of material, due to electrical signals, pipeline air pressure fluctuations, and mechanism actions, the time T4(3) for the material to reach the bag clamp outlet is longer than the preset time T4. This results in the time for the material to be completely loaded into the empty bag being extended by Dt3 compared to the preset time. However, the main swing arm still moves the full bag according to the preset time, which will result in a small portion of the material not being loaded into the empty bag but being trapped in the bag clamp. This will result in the current bag being underweight and the next bag being overweight, which will greatly reduce the packaging accuracy of the packaging machine. Summary of the Invention

[0004] To improve the production capacity of existing electronic cam-type double swing arm packaging machines, shorten the waiting time for materials to reach the bag opening, and ensure that all materials unloaded from the electronic scale are loaded into empty bags each time, thereby improving the packaging speed and accuracy of FFS packaging machines, this invention proposes a double swing arm high-speed bagging device. It includes an electronic scale 1, a transition hopper 2, a bag clamp 3, a material detection photoelectric sensor 4, a main swing arm 5, a secondary swing arm 6, and an electrical control system 7. The electronic scale 1 is located at the top of the device. The transition hopper 2 is located below the electronic scale 1, and its lower end is connected to the bag clamp 3. The bag clamp 3 has a horizontally illuminating material detection photoelectric sensor 4 near its lower outlet. The main swing arm 5 is located in front of the bag clamp 3, and the secondary swing arm 6 is located behind it. The electrical control system 7 includes a servo drive system that controls the operation of the main swing arm 5 and the secondary swing arm 6. The electrical control system 7 uses the feedback signal from the material detection photoelectric sensor 4 to coordinate and control all actions of the entire device.

[0005] The control method for high-speed bagging using the aforementioned double-swing-arm high-speed bagging device defines the following time parameters:

[0006] X - The pre-set delay time for the electronic scale 1 to start unloading downwards after the material falls to the detection photoelectric sensor 4;

[0007] Y - The pre-set delay time for the auxiliary swing arm 6 to start moving forward after the material falls to the detection photoelectric 4;

[0008] A - The pre-set maximum time difference between the start of the auxiliary swing arm 6 and the start of the main swing arm 5 moving forward;

[0009] B - Pre-set time for empty bags to wait for materials to arrive at the bag opening;

[0010] C - The actual time difference between initiating the forward movement of the auxiliary swing arm 6 and the main swing arm 5;

[0011] The time taken by the dt-electric control system 7 to wait for material to arrive at the bag opening in an empty bag;

[0012] T1 - The time it takes for the auxiliary swing arm 6 to move the empty bag forward to the bagging position;

[0013] The time it takes for the T3-bag clamp 3 to open an empty bag;

[0014] t4 - The time it takes for the material to fall to the material detection photoelectric sensor 4;

[0015] This control method includes the following control logic:

[0016] L1: After the previous bag of material falls to the detection photoelectric sensor 4, after a delay of Y, the auxiliary swing arm 6 is started to move the empty bag forward to the bagging position. After the previous bag of material has passed through the detection photoelectric sensor 4, the bag clamp 3 releases the full bag, and then the main swing arm 5 is started to move the full bag forward.

[0017] L2: After the auxiliary swing arm 6 moves the empty bag forward, the electronic control system 7 monitors the time difference C between the auxiliary swing arm 6 and the main swing arm 5. If the time difference C reaches the set value A, the auxiliary swing arm 6 needs to pause and wait for the main swing arm 5 to start before continuing to swing forward.

[0018] L3: After the previous bag of material falls to the material detection photoelectric sensor 4, the electronic scale 1 is started to unload the material after a delay of X.

[0019] L4: The electronic control system 7 uses the internal timing and the signal from the material detection photoelectric sensor 4 to measure the time dt it takes for the empty bag to wait for the material to arrive at the bag opening. Then, using the formula dt=X+t4-T3-T1-Y, it automatically adjusts the value of X so that the value of dt approaches the preset value B.

[0020] The technical principle of this invention is:

[0021] Depend on Figure 3 The timing diagram shown shows that X + t4 - dt = T3 + T1 + Y, from which we can derive dt = X + t4 - T3 - T1 - Y, where T3, T1, and Y are constants, and the value of t4 fluctuates slightly. Therefore, dt is directly proportional to X. Adjusting the value of X can adjust the value of dt. Usually, the preset value of B is about 20ms, and the value of dt fluctuates around 20ms.

[0022] exist Figure 2 In the time series diagram shown, the cycle period for a single bagging operation is T = T1 + T3 + Dt + T5 + T6. Figure 3 In the timing diagram shown, the cycle time for a single bagging is T' = T1 + T3 + dt + t5 + T6 - C. Therefore, (T - T') = (Dt - dt) + (T5 - t5) + C. Since the Dt value is usually set relatively large, while the dt value can be adjusted to a smaller value, and the preset T5 value is usually greater than the actual t5 value, the value of (T - T') is greater than C. This means that the following method is used... Figure 3 The control timing diagram shown has a shorter cycle time and a higher production capacity for the packaging machine.

[0023] The beneficial effects of this invention are:

[0024] A. By adopting the method of starting the auxiliary swing arm 6 earlier than the main swing arm 5, the empty bags are moved to the bagging position more quickly, enabling a seamless switch between the removal of full bags and the delivery of empty bags, shortening the bagging cycle and improving the packaging speed.

[0025] B. By using the signal from the material falling to the photoelectric sensor 4, the auxiliary swing arm 6 is controlled to move forward to deliver the empty bag and the electronic scale 1 to unload the material downward. This can keep the waiting time for the material to reach the bag opening within a very small range, thereby increasing the speed of the packaging machine.

[0026] C. By using the signal after all the material has passed through the photoelectric sensor 4, the main swing arm 5 is controlled to move forward to deliver the full bag, which can prevent the material from being trapped in the bag clamp 3, thereby improving the packaging accuracy of the packaging machine.

[0027] D. The electrical control system 7 compares the measured dt value with the set B value. When the material flow rate changes, causing the dt value to change, the X value can be automatically adjusted to make the dt value approach the B value, so that the packaging machine can automatically adapt to the changes in material parameters.

[0028] E. The shorter bagging cycle time improves the packaging capacity of the packaging machine. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the mechanism arrangement of the present invention.

[0030] Figure 2 This is the control logic timing diagram of an existing electronic cam-type double swing arm mechanism.

[0031] Figure 3 This is the control logic timing diagram of the present invention.

[0032] Figure 4 This is a schematic diagram of the unloading and bagging operation of the present invention. Detailed Implementation

[0033] For detailed embodiments of the present invention, please refer to Figures 1 to 4 A double-swing-arm high-speed bagging device includes an electronic scale 1, a transition hopper 2, a bag clamp 3, a material detection photoelectric sensor 4, a main swing arm 5, a secondary swing arm 6, and an electrical control system 7. The electronic scale 1 is located at the top of the device, and the transition hopper 2 is located below the electronic scale 1. The lower end of the transition hopper 2 is connected to the bag clamp 3. The material detection photoelectric sensor 4 with horizontal illumination is located near the lower outlet of the bag clamp 3. The main swing arm 5 is located in front of the bag clamp 3, and the secondary swing arm 6 is located behind the bag clamp 3. The electrical control system 7 includes a servo drive system, which controls the operation of the main swing arm 5 and the secondary swing arm 6. The electrical control system 7 uses the signal fed back by the material detection photoelectric sensor 4 to coordinate and control all actions of the entire device.

[0034] The control method for high-speed bagging using the aforementioned double-swing-arm high-speed bagging device defines the following time parameters:

[0035] X - The pre-set delay time for the electronic scale 1 to start unloading downwards after the material falls to the detection photoelectric sensor 4;

[0036] Y - The pre-set delay time for the auxiliary swing arm 6 to start moving forward after the material falls to the detection photoelectric 4;

[0037] A - The pre-set maximum time difference between the start of the auxiliary swing arm 6 and the start of the main swing arm 5 moving forward;

[0038] B - Pre-set time for empty bags to wait for materials to arrive at the bag opening;

[0039] C - The actual time difference between initiating the forward movement of the auxiliary swing arm 6 and the main swing arm 5;

[0040] The time taken by the dt-electric control system 7 to wait for material to arrive at the bag opening in an empty bag;

[0041] T1 - The time it takes for the auxiliary swing arm 6 to move the empty bag forward to the bagging position;

[0042] The time it takes for the T3-bag clamp 3 to open an empty bag;

[0043] t4 - The time it takes for the material to fall to the material detection photoelectric sensor 4;

[0044] This control method includes the following control logic:

[0045] L1: After the previous bag of material falls to the detection photoelectric sensor 4, after a delay of Y, the auxiliary swing arm 6 is started to move the empty bag forward to the bagging position. After the previous bag of material has passed through the detection photoelectric sensor 4, the bag clamp 3 releases the full bag, and then the main swing arm 5 is started to move the full bag forward.

[0046] L2: After the auxiliary swing arm 6 moves the empty bag forward, the electronic control system 7 monitors the time difference C between the auxiliary swing arm 6 and the main swing arm 5. If the time difference C reaches the set value A, the auxiliary swing arm 6 needs to pause and wait for the main swing arm 5 to start before continuing to swing forward.

[0047] L3: After the previous bag of material falls to the material detection photoelectric sensor 4, the electronic scale 1 is started to unload the material after a delay of X.

[0048] L4: The electronic control system 7 uses the internal timing and the signal from the material detection photoelectric sensor 4 to measure the time dt it takes for the empty bag to wait for the material to arrive at the bag opening. Then, using the formula dt=X+t4-T3-T1-Y, it automatically adjusts the value of X so that the value of dt approaches the preset value B.

Claims

1. A control method for a double-swing-arm high-speed bagging device, comprising an electronic scale (1), a transition hopper (2), a bag clamp (3), a main swing arm (5), a secondary swing arm (6), and an electrical control system (7), wherein the electronic scale (1) is located at the uppermost end of the device, the transition hopper (2) is provided below the electronic scale (1), the lower end of the transition hopper (2) is connected to the bag clamp (3), the main swing arm (5) is provided in front of the bag clamp (3), and the secondary swing arm (6) is provided behind the bag clamp (3), the electrical control system (7) includes a servo drive system, the servo drive system controls the operation of the main swing arm (5) and the secondary swing arm (6), characterized in that: The bag clamp (3) is equipped with a transversely irradiating material detection photoelectric sensor (4) near the lower outlet. The electrical control system (7) uses the feedback signal from the material detection photoelectric sensor (4) to coordinate and control all actions of the entire device. This method defines the following time parameters: X - The pre-set delay time for the electronic scale (1) to unload downwards after the material falls to the detection photoelectric sensor (4) and is delayed; Y - The pre-set delay time for the auxiliary swing arm (6) to move forward after the material falls to the detection photoelectric sensor (4); A - The maximum time difference between the start of the auxiliary swing arm (6) and the start of the main swing arm (5) moving forward, which is preset in advance; B - Pre-set time for empty bags to wait for materials to arrive at the bag opening; C - The actual time difference between initiating the forward movement of the auxiliary swing arm (6) and the main swing arm (5); The time taken by the dt-electric control system (7) to wait for material to arrive at the bag opening in an empty bag; T1 - The time it takes for the auxiliary swing arm (6) to move the empty bag forward to the bagging position; T3-bag clamp (3) time to open empty bag; t4 - the time it takes for the material to fall to the material detection photoelectric sensor (4); This control method includes the following control logic: L1: After the previous bag of material falls to the inspection photoelectric sensor (4), after a delay of Y, the auxiliary swing arm (6) is started to move the empty bag forward to the bagging position. After the previous bag of material has passed through the inspection photoelectric sensor (4), the bag clamp (3) releases the full bag, and then the main swing arm (5) is started to move the full bag forward. L2: After the auxiliary swing arm (6) moves the empty bag forward, the electronic control system (7) monitors the time difference C between the auxiliary swing arm (6) and the main swing arm (5). If the time difference C reaches the set value A, the auxiliary swing arm (6) needs to pause and wait for the main swing arm (5) to start before continuing to swing forward. L3: After the previous bag of material falls to the material inspection photoelectric sensor (4), the electronic scale (1) is started to unload the material downward after a delay of X. L4: The electrical control system (7) uses the signals from the internal timing and the material detection photoelectric (4) to measure the time dt for the empty bag to wait for the material to arrive at the bag opening. Then, using the formula dt=X+t4-T3-T1-Y, it automatically adjusts the value of X so that the value of dt approaches the preset value B.

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