Tobacco stem recovery device of cigarette making machine and control method of tobacco stem recovery device

Abstract

The invention discloses a tobacco stem recovery device of a cigarette making machine and a control method of the tobacco stem recovery device. The tobacco stem recovery device comprises a central suction branch pipeline, an independent suction branch pipeline, a switching valve, a pressure switch and a control unit. The central suction branch pipeline and the independent suction branch pipelines are respectively communicated with the tobacco stem inlet pipeline; the switching valve is arranged at the communication part of the central suction branch pipeline and the tobacco stem inlet pipeline and is arranged at the communication part of the independent suction branch pipeline and the tobacco stem inlet pipeline; the pressure switch is arranged in the central suction branch pipeline and is used for detecting a pressure signal in the central suction branch pipeline; the control unit is electrically connected with the switching valve and the pressure switch. According to the technical scheme, the tobacco stems are continuously removed under the condition of no shutdown, sufficient time is provided for maintenance personnel to dredge the pipeline, and finally the operation efficiency and the productivity of equipment are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing machinery technology, and in particular to a tobacco stem recycling device for a cigarette machine and its control method. Background Technology

[0002] In the cigarette production process, to ensure the quality of cigarettes, it is necessary to separate and remove the tobacco stems from the tobacco shreds. The GD121 cigarette machine accomplishes this process through its tobacco stem removal unit: the tobacco shreds and tobacco stems are separated in a turbulent flow chamber, the lighter tobacco shreds are sucked away, and the heavier tobacco stems fall through the valve rollers into the conveying pipe below.

[0003] In existing technology, a single cigarette-making machine is equipped with only a single central tobacco stem suction system. Due to the large amount of tobacco stems to be removed, the long and winding conveyor pipes, the central suction pipe is prone to blockage. Once blocked, the machine must be stopped immediately for manual unblocking, which takes more than two hours each time. This directly reduces the effective operating time of the equipment, seriously affecting production efficiency and output. Summary of the Invention

[0004] This invention provides a tobacco stem recycling device and its control method for a cigarette rolling machine, in order to solve the problem in the prior art where blockage of the tobacco stem recycling pipeline leads to long downtime and affects production efficiency.

[0005] According to a first aspect of the present invention, a cigarette stem recycling device for a cigarette machine is provided, comprising: a central suction branch pipe, an independent suction branch pipe, a switching valve, a pressure switch, and a control unit;

[0006] The central suction branch pipe and the independent suction branch pipe are respectively connected to the tobacco stem inlet pipe; the switching valve is set at the connection between the central suction branch pipe and the tobacco stem inlet pipe and at the connection between the independent suction branch pipe and the tobacco stem inlet pipe, and is used to close the connection between the central suction branch pipe and the tobacco stem inlet pipe and open the independent suction branch pipe and the tobacco stem inlet pipe, or to open the central suction branch pipe and the tobacco stem inlet pipe and close the connection between the independent suction branch pipe and the tobacco stem inlet pipe.

[0007] The pressure switch is installed in the central suction branch pipe and is used to detect the pressure signal in the central suction branch pipe.

[0008] The control unit is electrically connected to the switching valve and the pressure switch respectively. It is used to receive the pressure signal from the pressure switch and control the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and to open the independent suction branch pipe and the tobacco stem inlet pipe.

[0009] Optionally, a negative pressure generating unit may also be included;

[0010] The control unit is electrically connected to the negative pressure generating unit and is used to control the start of the negative pressure generating unit, thereby controlling the independent suction branch pipe to generate negative pressure to draw out the smoke stem.

[0011] Optionally, the negative pressure generating unit includes a compressed air source, a solenoid valve, and a negative pressure generator;

[0012] The negative pressure generator is installed in an independent suction branch pipe; the compressed air source is connected to the negative pressure generator and is also connected to the central suction branch pipe.

[0013] The solenoid valve is located between the compressed air source and the negative pressure generator.

[0014] The control unit is electrically connected to the solenoid valve and is used to control the solenoid valve to open the pipeline between the compressed air source and the negative pressure generator when a pressure signal is received.

[0015] Optional features also include pneumatically controlled directional valves and rotary cylinders;

[0016] The pneumatically controlled directional valve is connected to a compressed air source via a solenoid valve;

[0017] The rotary cylinder is connected to the pneumatically controlled directional valve and is fixedly connected to the switching valve.

[0018] The control unit is also used to control the solenoid valve to open the pneumatic reversing valve and the compressed air source when a pressure signal is received, so as to control the rotary cylinder to drive the switching valve to rotate, thereby closing the connection between the central suction branch pipe and the tobacco stem inlet pipe, and opening the independent suction branch pipe and the tobacco stem inlet pipe.

[0019] Optional features include manual rotary switches and relays;

[0020] A manual rotary switch includes a first contact terminal, a second contact terminal, and a third contact terminal; a relay includes a relay coil and a relay switch;

[0021] The first contact point is electrically connected to the positive terminal of the power supply.

[0022] The second and third contact terminals are electrically connected to the negative terminal of the power supply, respectively; a pressure switch and a relay coil are connected in series between the second contact terminal and the negative terminal of the power supply; a relay coil is connected in series between the third contact terminal and the negative terminal of the power supply.

[0023] A relay switch and a solenoid valve are connected in series in the circuit between the positive and negative terminals of the power supply.

[0024] Optionally, the central suction branch pipe is connected to the central suction main pipe; the independent suction branch pipe is connected to the tobacco stem box.

[0025] According to a second aspect of the present invention, a control method for a tobacco stem recycling device is provided, applied in a tobacco stem recycling device; the control method includes:

[0026] Receives pressure signals from pressure switches;

[0027] Control the connection between the central suction branch pipe and the tobacco stem inlet pipe to close, and open the independent suction branch pipe and the tobacco stem inlet pipe.

[0028] Optionally, the tobacco stem recycling device may also include a negative pressure generating unit;

[0029] After receiving the pressure signal from the pressure switch, it also includes:

[0030] The negative pressure generating unit is activated, which in turn controls the central suction branch pipe or the independent suction branch pipe to generate negative pressure in order to draw out the smoke stem.

[0031] Optionally, the negative pressure generating unit includes a compressed air source, a solenoid valve, and a negative pressure generator;

[0032] Controlling the generation of negative pressure in the independent suction branch pipeline includes:

[0033] Control the solenoid valve to open the pipeline between the compressed air source and the negative pressure generator.

[0034] Optional features also include pneumatically controlled directional valves and rotary cylinders;

[0035] Controlling the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and opening the independent suction branch pipe and the tobacco stem inlet pipe, including:

[0036] The solenoid valve controls the pneumatic directional valve and the compressed air source to control the rotary cylinder to rotate the switching valve.

[0037] The technical solution of this invention, by promptly controlling the switching valve to switch the collection pipeline when a blockage is detected in the central suction branch pipeline, allows the tobacco stems to continue to be collected through the independent suction branch pipeline, thereby achieving continuous removal of tobacco stems without stopping the machine and providing maintenance personnel with ample time to unclog the pipeline, ultimately significantly improving the operating efficiency and production capacity of the equipment.

[0038] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the first working state of a tobacco stem recycling device according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the second working state of a tobacco stem recycling device according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of a tobacco stem recycling device according to an embodiment of the present invention;

[0043] Figure 4 This is a circuit connection diagram of a tobacco stem recycling device according to an embodiment of the present invention;

[0044] Figure 5 This is a flowchart of the control method for the first tobacco stem recycling device provided according to an embodiment of the present invention;

[0045] Figure 6 This is a flowchart of the control method for a second tobacco stem recycling device provided according to an embodiment of the present invention;

[0046] Figure 7 This is a flowchart of the control method for the third tobacco stem recycling device provided in the embodiments of the present invention;

[0047] Figure 8 This is a flowchart of the control method for the fourth tobacco stem recycling device provided in an embodiment of the present invention. Detailed Implementation

[0048] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] Figure 1 This is a schematic diagram of the first working state of a tobacco stem recycling device according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the second working state of a tobacco stem recycling device according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the tobacco stem recycling device includes:

[0051] 1. Central suction branch pipeline; 2. Independent suction branch pipeline; 3. Switching valve; 4. Pressure switch; 5. Control unit;

[0052] The central suction branch pipe 1 and the independent suction branch pipe 2 are respectively connected to the tobacco stem inlet pipe 6; the switching valve 3 is set at the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6 and at the connection between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6, and is used to close the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6 and open the independent suction branch pipe 2 and the tobacco stem inlet pipe 6, or to open the central suction branch pipe 1 and the tobacco stem inlet pipe 6 and close the connection between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6.

[0053] Pressure switch 4 is installed in the central suction branch pipe 1 to detect the pressure signal in the central suction branch pipe 1.

[0054] The control unit 5 is electrically connected to the switching valve 3 and the pressure switch 4 respectively. It is used to receive the pressure signal from the pressure switch 4 and control the closure of the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, and to open the independent suction branch pipe 2 and the tobacco stem inlet pipe 6.

[0055] The central suction branch pipe 1 can be a pipe for sucking tobacco stems. The central suction branch pipe 1 is connected to the tobacco stem inlet pipe 6. Under normal working conditions, the tobacco stems are sucked from the tobacco stem inlet pipe 6 into the central suction branch pipe 1 for collection.

[0056] The independent suction branch pipe 2 is independent of the central suction branch pipe 1, and it is also connected to the tobacco stem inlet pipe 6. For example, the central suction branch pipe 1, the independent suction branch pipe 2, and the tobacco stem inlet pipe 6 form a Y-shaped pipeline, allowing for two suction paths for the tobacco stem: one from the tobacco stem inlet pipe 6 to the central suction branch pipe 1, and the other from the tobacco stem inlet pipe 6 to the independent suction branch pipe 2. In this embodiment of the invention, the independent suction branch pipe 2 is only activated when the central suction branch pipe 1 becomes blocked.

[0057] The switching valve 3 can switch between the central suction branch pipe 1 and the independent suction branch pipe 2. Specifically, the switching valve 3 is located at the connection point between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, and also at the connection point between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6. The switching valve 3 can close the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, or it can close the connection between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6. For example, the switching valve 3 can be a three-way ball valve.

[0058] The pressure switch 4 is installed in the central suction branch pipe 1 and can be used to detect the pressure of the central suction branch pipe 1. When the detected pressure is lower than a certain threshold, it transmits a pressure signal to the control unit 5.

[0059] The control unit 5 is electrically connected to the switching valve 3 and the pressure switch 4. When a pressure signal is received, it indicates that a blockage has occurred in the central suction branch pipe 1, causing the pressure to increase. The control unit 5 controls the switching valve 3 to switch, thereby closing the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, and opening the independent suction branch pipe 2 and the tobacco stem inlet pipe 6, so that the tobacco stems enter the independent suction branch pipe 2 for collection.

[0060] For example, switching valve 3 switches to the passage between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6, closing the connection between them. At this time, the central suction branch pipe 1 and the tobacco stem inlet pipe 6 are connected. Tobacco stems are drawn from the tobacco stem inlet pipe 6 into the central suction branch pipe 1, and pressure switch 4 monitors the pressure in the central suction branch pipe 1 in real time. When the central suction branch pipe 1 becomes blocked, the pressure detected by pressure switch 4 is lower than a threshold. At this time, a pressure signal is sent to control unit 5, which controls switching valve 3 to switch to the passage between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, opening the passage between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6, thereby ensuring normal tobacco stem collection.

[0061] In some embodiments, the central suction branch pipe 1 is connected to the central suction main pipe 10, so that the tobacco stems passing through the central suction branch pipe 1 enter the central suction main pipe 10 for collection; the independent suction branch pipe 2 is connected to the tobacco stem box 20, so that the tobacco stems passing through the independent suction branch pipe 2 are collected into the tobacco stem box 20.

[0062] The technical solution of this invention, by promptly controlling the switching valve to switch the collection pipeline when a blockage is detected in the central suction branch pipeline, allows the tobacco stems to continue to be collected through the independent suction branch pipeline, thereby achieving continuous removal of tobacco stems without stopping the machine and providing maintenance personnel with ample time to unclog the pipeline, ultimately significantly improving the operating efficiency and production capacity of the equipment.

[0063] Optional, continue to refer to Figure 1 and Figure 2 As shown, it also includes a negative pressure generating unit 7;

[0064] The control unit 5 is electrically connected to the negative pressure generating unit 7 and is used to control the negative pressure generating unit 7 to start, thereby controlling the central suction branch pipe 1 or the independent suction branch pipe 2 to generate negative pressure to draw out the smoke stem.

[0065] Among them, the negative pressure generating unit 7 can be used to generate negative pressure in the pipeline, thereby realizing the suction function.

[0066] The control unit 5 is electrically connected to the negative pressure generating unit 7 and can control the start and stop of the negative pressure generating unit 7.

[0067] For example, under normal operating conditions, the control unit 5 controls the negative pressure generating unit 7 to start, thereby creating negative pressure in the central suction branch pipe 1 to draw out the smoke stem. When the central suction branch pipe 1 becomes blocked, the control unit 5 controls the independent suction branch pipe 2 to generate negative pressure, thereby drawing out the smoke stem.

[0068] The technical solution of this invention provides a negative pressure generating unit, which is used to control the negative pressure generating unit to achieve the suction of tobacco stems, thus ensuring the normal operation of the tobacco stem recycling device.

[0069] Optional, continue to refer to Figure 1 and Figure 2 As shown, the negative pressure generating unit 7 includes a compressed air source 71, a solenoid valve 72, and a negative pressure generator 73;

[0070] The negative pressure generator 73 is installed in the independent suction branch pipe 2; the compressed air source 71 is connected to the negative pressure generator 73 and is also connected to the central suction branch pipe 1.

[0071] The solenoid valve 72 is located between the compressed air source 71 and the negative pressure generator 73.

[0072] The control unit 5 is electrically connected to the solenoid valve 72 and is used to control the solenoid valve 72 to open the pipeline between the compressed air source 71 and the negative pressure generator 73 when a pressure signal is received.

[0073] The compressed air source 71 can be a compressed air pressure generating device. The solenoid valve 72 can be used to control the operating path of the compressed air source 71. The negative pressure generator 73 can be a device that generates negative pressure using the compressed air source.

[0074] Specifically, the compressed air source 71 is connected to the negative pressure generator 73 and the central suction branch pipe 1 respectively. The solenoid valve 72 is located between the compressed air source 71 and the negative pressure generator 73. The control unit 5 can control the connection between the compressed air source 71 and the central suction branch pipe 1 or between the compressed air source 71 and the negative pressure generator 73 by controlling the solenoid valve 72.

[0075] For example, under normal operating conditions, the valve core of switching valve 3 is in its initial position, between the independent suction branch pipe 2 and the tobacco stem inlet pipe 6. At this time, the central suction branch pipe 1 is connected, and the independent suction branch pipe 2 is closed. After the tobacco stems fall from the removal unit, they naturally enter the central suction branch pipe 1 and are normally drawn away by the central system fan. Pressure switch 4 continuously monitors the pressure in the central suction branch pipe 1. When the central suction branch pipe 1 becomes blocked, pressure switch 4 detects that the pressure value is lower than the preset normal range. Pressure switch 4 transmits the pressure signal to control unit 5. After judgment, control unit 5 immediately outputs a control signal to energize solenoid valve 72 and reverse it. Compressed air is directly supplied to negative pressure generator 73 through solenoid valve 72. Negative pressure generator 73 starts working, generating a strong suction force in independent suction branch pipe 2.

[0076] The technical solution of this invention, by setting a compressed air source, a solenoid valve and a negative pressure generator in the negative pressure generating unit, when a blockage is detected in the central suction branch pipe, controls the solenoid valve to switch, thereby generating suction force in the independent suction branch pipe, realizing automatic system switching when a blockage occurs, and improving production efficiency.

[0077] Optional, continue to refer to Figure 1 and Figure 2 As shown, it also includes a pneumatically controlled directional valve 81 and a rotary cylinder 82;

[0078] The pneumatically controlled reversing valve 81 is connected to the compressed air source 71 via the solenoid valve 72;

[0079] The rotary cylinder 82 is connected to the pneumatically controlled directional valve 81 and is fixedly connected to the switching valve 3;

[0080] The control unit 5 is also used to control the solenoid valve 72 to open the pneumatic control reversing valve 81 and the compressed air source 71 when a pressure signal is received, so as to control the rotary cylinder 82 to drive the switching valve 3 to rotate, thereby closing the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, and opening the independent suction branch pipe 2 and the tobacco stem inlet pipe 6.

[0081] Among them, the pneumatically controlled directional valve 81 can be a valve that uses a gas pressure signal to control the change of airflow direction. The rotary cylinder 82 can be a pneumatic actuator with a rotary output shaft, which is fixedly connected to the switching valve 3 and can drive the switching valve 3 to rotate.

[0082] Specifically, when the central suction branch pipe 1 is blocked, the solenoid valve 72 is energized and reversed. At this time, the compressed air source 71 is connected to the pneumatic control reversing valve 81. The compressed air drives the pneumatic control reversing valve 81 to control the rotary cylinder 82. The rotary cylinder 82 rotates and drives the switching valve 3 to rotate, thereby closing the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, and opening the independent suction branch pipe 2 and the tobacco stem inlet pipe 6.

[0083] For example, the pneumatically controlled directional valve 81 drives the rotary cylinder 82 to rotate 90°, which in turn drives the switching valve 3 connected to it to rotate 90° synchronously.

[0084] Understandably, the entire process is completed automatically within seconds, and the cigarette-making machine does not need to be stopped to continue production. Operators can then clear any blockages in the central pipeline during production breaks or after production has ended.

[0085] The technical solution of this invention, by setting up a pneumatically controlled reversing valve and a rotary cylinder, enables the switching of the switching valve and the suction of negative pressure in the independent suction branch pipe to be carried out simultaneously, thereby achieving automatic control and ensuring production efficiency.

[0086] Optional, Figure 3 This is a schematic diagram of a tobacco stem recycling device according to an embodiment of the present invention. Figure 4 This is a circuit connection diagram of a tobacco stem recycling device according to an embodiment of the present invention, combined with... Figure 1 , Figure 3 and Figure 4 As shown, it also includes a manual rotary switch 91 and a relay 92;

[0087] The manual rotary switch 91 includes a first contact terminal a, a second contact terminal b, and a third contact terminal c; the relay 92 includes a relay coil 921 and a relay switch 922;

[0088] The first contact point a is electrically connected to the positive terminal of the power supply.

[0089] The second contact terminal b and the third contact terminal c are electrically connected to the negative terminal of the power supply respectively; the pressure switch 4 and the relay coil 921 are connected in series between the second contact terminal b and the negative terminal of the power supply; the relay coil 921 is connected in series between the third contact terminal c and the negative terminal of the power supply.

[0090] A relay switch 922 and a solenoid valve 72 are connected in series in the circuit between the positive and negative terminals of the power supply.

[0091] The tobacco stem recycling device in this embodiment of the invention also includes a manual mode. A manual rotary switch 91 can be used to switch between manual and manual modes. The first contact a of the manual rotary switch 91 is electrically connected to the positive terminal of the power supply; the second contact b is connected to the negative terminal of the power supply after being connected in series with the pressure switch 4 and the relay coil 921, thus forming the first circuit; the third contact c is connected in series only with the relay coil 921 and then electrically connected to the negative terminal of the power supply, thus forming the second circuit. A relay switch 922 and a solenoid valve 72 are also connected in series in the circuit between the positive and negative terminals of the power supply.

[0092] For example, in automatic mode, under normal conditions, the first contact terminal a and the second contact terminal b are connected, the pressure switch 4 is in the open state, the relay coil 921 is de-energized, and the relay switch 922 is open. When the central suction branch pipe 1 is blocked, the pressure switch 4 closes, the relay coil 921 is energized, the relay switch 922 closes, and the solenoid valve 72 is energized and reversed. In manual mode, the first contact terminal a and the third contact terminal c are connected, the relay coil 921 is energized, the relay switch 922 closes, and the solenoid valve 72 is energized and reversed.

[0093] Understandably, when advance maintenance or forced activation of the independent suction branch pipe 2 is required, the operator can rotate the manual rotary switch 91. This operation directly controls the relay 92 and solenoid valve 72, forcing the system to switch to independent suction mode, regardless of the pressure signal.

[0094] The technical solution of this invention realizes a manual mode by setting a manual rotary switch and a relay, which provides operational flexibility and facilitates equipment maintenance and forced operation.

[0095] Based on the same inventive concept. Figure 5 This is a flowchart of the control method for the first tobacco stem recycling device according to an embodiment of the present invention, combined with... Figure 1 , Figure 2 and Figure 5 As shown, this embodiment of the invention provides a control method for a tobacco stem recycling device, applied in a tobacco stem recycling device; the control method includes:

[0096] S10: Receives the pressure signal from the pressure switch.

[0097] The pressure switch 4 is installed in the central suction branch pipe 1 and can be used to detect the pressure of the central suction branch pipe 1. When the detected pressure is lower than a certain threshold, it transmits a pressure signal to the control unit 5.

[0098] S11. Control the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and open the independent suction branch pipe and the tobacco stem inlet pipe.

[0099] For example, pressure switch 4 monitors the pressure in the central suction branch pipe 1 in real time. When the central suction branch pipe 1 is blocked, the pressure detected by pressure switch 4 is lower than the threshold. At this time, it sends a pressure signal to control unit 5. Control unit 5 controls switching valve 3 to switch to the passage between central suction branch pipe 1 and tobacco stem inlet pipe 6, opening the passage between independent suction branch pipe 2 and tobacco stem inlet pipe 6, thereby ensuring the normal collection of tobacco stems.

[0100] The technical solution of this invention, by promptly controlling the switching valve to switch the collection pipeline when a blockage is detected in the central suction branch pipeline, allows the tobacco stems to continue to be collected through the independent suction branch pipeline, thereby achieving continuous removal of tobacco stems without stopping the machine and providing maintenance personnel with ample time to unclog the pipeline, ultimately significantly improving the operating efficiency and production capacity of the equipment.

[0101] Based on the above embodiments, Figure 6 This is a flowchart of the control method for the second tobacco stem recycling device provided according to an embodiment of the present invention, combined with... Figure 1 , Figure 2 and Figure 6 As shown, the tobacco stem recycling device also includes a negative pressure generating unit 7. The control method includes:

[0102] S20: Receives the pressure signal from the pressure switch.

[0103] S21. Control the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and connect the independent suction branch pipe 2 and the tobacco stem inlet pipe.

[0104] S22. Control the negative pressure generating unit to start, and then control the independent suction branch pipe to generate negative pressure to draw out the smoke stem.

[0105] For example, when the central suction branch pipe 1 is blocked, the control unit 5 controls the negative pressure generating unit 7 to generate negative pressure in the independent suction branch pipe 2, thereby drawing out the smoke stem.

[0106] The technical solution of this invention provides a negative pressure generating unit, which is used to control the negative pressure generating unit to achieve the suction of tobacco stems, thus ensuring the normal operation of the tobacco stem recycling device.

[0107] Based on the above embodiments, Figure 7This is a flowchart of the control method for the third tobacco stem recycling device provided in the embodiments of the present invention, combined with... Figure 1 , Figure 2 and Figure 7 As shown, the negative pressure generating unit 7 includes a compressed air source 71, a solenoid valve 72, and a negative pressure generator 73. The control method includes:

[0108] S30: Receives the pressure signal from the pressure switch.

[0109] S31. Control the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and open the independent suction branch pipe and the tobacco stem inlet pipe.

[0110] S32, control the solenoid valve to open the pipeline between the compressed air source and the negative pressure generator.

[0111] For example, when the central suction branch pipe 1 becomes blocked, the pressure switch 4 transmits a pressure signal to the control unit 5. After determining the blockage, the control unit 5 immediately outputs a control signal to energize the solenoid valve 72 and reverse its direction. Compressed air is then supplied directly to the negative pressure generator 73 through the solenoid valve 72, and the negative pressure generator 73 begins to work, generating a strong suction force in the independent suction branch pipe 2.

[0112] The technical solution of this invention, by controlling the switching of the solenoid valve, generates suction force in the independent suction branch pipe, thereby realizing automatic system switching when blockage occurs and improving production efficiency.

[0113] Based on the above embodiments, Figure 8 This is a flowchart of the control method for the fourth tobacco stem recycling device provided in the embodiments of the present invention, combined with... Figure 1 , Figure 2 and Figure 8 As shown, the tobacco stem recycling device also includes a pneumatically controlled reversing valve 81 and a rotary cylinder 82. The control method includes:

[0114] S40: Receives the pressure signal from the pressure switch.

[0115] S41. Control the solenoid valve to connect the pneumatic reversing valve and the compressed air source, so as to control the rotary cylinder to drive the switching valve to rotate.

[0116] Specifically, when the central suction branch pipe 1 is blocked, the solenoid valve 72 is energized and reversed. At this time, the compressed air source 71 is connected to the pneumatic control reversing valve 81. The compressed air drives the pneumatic control reversing valve 81 to control the rotary cylinder 82. The rotary cylinder 82 rotates and drives the switching valve 3 to rotate, thereby closing the connection between the central suction branch pipe 1 and the tobacco stem inlet pipe 6, and opening the independent suction branch pipe 2 and the tobacco stem inlet pipe 6.

[0117] S42, control the solenoid valve to open the pipeline between the compressed air source and the negative pressure generator.

[0118] The beneficial effects of the technical solution in the embodiments of the present invention are as follows:

[0119] Significantly improves equipment efficiency: It enables uninterrupted operation during blockages, avoiding downtime losses of more than 2 hours each time, and directly improving the effective operating rate and output of the equipment;

[0120] High degree of automation: The entire process is automatically detected, judged, and switched without human intervention, reducing the labor intensity and emergency response pressure on operators;

[0121] Retain original functions: The important tobacco stem sampling function has been fully retained to ensure that process quality monitoring is not affected;

[0122] Safety and convenience: Manual mode provides operational flexibility, facilitating equipment maintenance and forced operation;

[0123] Low cost and quick implementation: The modular installation solution avoids large-scale destructive modifications to the original equipment, has a short implementation cycle, is reversible, and has low risk.

[0124] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0125] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A tobacco stem recycling device for a cigarette rolling machine, characterized in that, include: Central suction branch pipeline, independent suction branch pipeline, switching valve, pressure switch and control unit; The central suction branch pipe and the independent suction branch pipe are respectively connected to the tobacco stem inlet pipe; the switching valve is located at the connection between the central suction branch pipe and the tobacco stem inlet pipe and at the connection between the independent suction branch pipe and the tobacco stem inlet pipe, and is used to close the connection between the central suction branch pipe and the tobacco stem inlet pipe and open the independent suction branch pipe and the tobacco stem inlet pipe, or to open the central suction branch pipe and the tobacco stem inlet pipe and close the connection between the independent suction branch pipe and the tobacco stem inlet pipe; The pressure switch is installed in the central suction branch pipe and is used to detect the pressure signal in the central suction branch pipe. The control unit is electrically connected to the switching valve and the pressure switch respectively, and is used to receive the pressure signal from the pressure switch and control the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and to open the independent suction branch pipe and the tobacco stem inlet pipe.

2. The tobacco stem recycling device according to claim 1, characterized in that, It also includes a negative pressure generating unit; The control unit is electrically connected to the negative pressure generating unit and is used to control the negative pressure generating unit to start, thereby controlling the central suction branch pipe or the independent suction branch pipe to generate negative pressure to draw out the tobacco stem.

3. The tobacco stem recycling device according to claim 2, characterized in that, The negative pressure generating unit includes a compressed air source, a solenoid valve, and a negative pressure generator; The negative pressure generator is installed in the independent suction branch pipe; the compressed air source is connected to the negative pressure generator and is also connected to the central suction branch pipe; The solenoid valve is disposed between the compressed air source and the negative pressure generator. The control unit is electrically connected to the solenoid valve and is used to control the solenoid valve to open the pipeline between the compressed air source and the negative pressure generator when the pressure signal is received.

4. The tobacco stem recycling device according to claim 3, characterized in that, It also includes pneumatically controlled directional valves and rotary cylinders; The pneumatically controlled reversing valve is connected to the compressed air source through the solenoid valve; The rotary cylinder is connected to the pneumatically controlled reversing valve and is fixedly connected to the switching valve; The control unit is also used to control the solenoid valve to open the pneumatic reversing valve and the compressed air source when it receives the pressure signal, so as to control the rotary cylinder to drive the switching valve to rotate, thereby closing the connection between the central suction branch pipe and the tobacco stem inlet pipe, and opening the independent suction branch pipe and the tobacco stem inlet pipe.

5. The tobacco stem recycling device according to claim 3, characterized in that, It also includes manual rotary switches and relays; The manual rotary switch includes a first contact terminal, a second contact terminal, and a third contact terminal; the relay includes a relay coil and a relay switch; The first contact point is electrically connected to the positive terminal of the power supply; The second contact terminal and the third contact terminal are respectively electrically connected to the negative terminal of the power supply; the pressure switch and the relay coil are connected in series between the second contact terminal and the negative terminal of the power supply; the relay coil is connected in series between the third contact terminal and the negative terminal of the power supply. The relay switch and the solenoid valve are also connected in series in the circuit between the positive and negative terminals of the power supply.

6. The tobacco stem recycling device according to claim 1, characterized in that, The central suction branch pipe is connected to the central suction main pipe; the independent suction branch pipe is connected to the tobacco stem box.

7. A control method for a tobacco stem recycling device, characterized in that, The method is applied in the tobacco stem recycling device according to any one of claims 1-6; the control method includes: Receives pressure signals from pressure switches; Control the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and open the independent suction branch pipe and the tobacco stem inlet pipe.

8. The valve pneumatic pressure holding detection method according to claim 7, characterized in that, The tobacco stem recycling device also includes a negative pressure generating unit; After receiving the pressure signal from the pressure switch, it also includes: The negative pressure generating unit is activated, which in turn controls the independent suction branch pipe to generate negative pressure in order to draw out the tobacco stem.

9. The valve pneumatic pressure holding detection method according to claim 8, characterized in that, The negative pressure generating unit includes a compressed air source, a solenoid valve, and a negative pressure generator; Controlling the generation of negative pressure in the independent suction branch pipe includes: The solenoid valve is controlled to open the pipeline between the compressed air source and the negative pressure generator.

10. The valve pneumatic pressure holding detection method according to claim 9, characterized in that, It also includes pneumatically controlled directional valves and rotary cylinders; Controlling the closure of the connection between the central suction branch pipe and the tobacco stem inlet pipe, and opening the independent suction branch pipe and the tobacco stem inlet pipe, includes: The solenoid valve is controlled to connect the pneumatic reversing valve and the compressed air source, thereby controlling the rotary cylinder to rotate the switching valve.

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