Bag suction detection device of packaging machine

Abstract

The utility model discloses a bag suction detection device of a packaging machine. The bag suction detection device comprises a negative pressure source, a vacuum suction nozzle and a PLC (Programmable Logic Controller), the negative pressure source is connected with one end of the main pipeline which is provided with the flow sensor. The negative pressure source is provided with a barometer switch; two groups of vacuum suction nozzles are arranged; the two groups of vacuum suction nozzles are respectively connected with the other end of the main pipeline through branch pipelines; vacuum electromagnetic valves are mounted at the connecting positions of the main pipeline and the two branch pipelines; the PLC is respectively connected with the flow sensor and the vacuum electromagnetic valve; whether the vacuum suction nozzle sucks the packaging bag or not is judged by detecting the flow speed, false triggering or detection failure can be avoided, and the detection accuracy and the detection efficiency can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of packaging, and in particular relates to a bag suction detection device for a packaging machine. Background Art

[0002] Currently, packaging machines need to open the bags before adding materials, but sometimes they cannot open the bags. For example, packaging machines need to open the medicine bags before adding medicine, but sometimes they cannot open the medicine bags.

[0003] Conventional detection methods use mechanical switches or photoelectric sensors to detect whether a package is open. Mechanical switches require a certain amount of force to trigger, and can trigger falsely if the force is inappropriate. Photoelectric sensors, on the other hand, have specific requirements for the color of the package and can be selective. For example, they are insensitive to black packages, or may even fail to detect them, resulting in inaccurate detection. Utility Model Content

[0004] The purpose of the utility model is to provide a bag suction detection device for a packaging machine to solve the problem that the existing technology of detecting whether the packaging bag is opened is prone to false triggering or detection failure, resulting in inaccurate detection. It determines whether the vacuum suction nozzle has sucked the packaging bag by detecting the flow rate, which is conducive to avoiding false triggering or detection failure and improving detection accuracy and efficiency.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides a bag suction detection device for a packaging machine, comprising a negative pressure source, a vacuum suction nozzle and a PLC controller; the negative pressure source is connected to one end of a main pipeline, and a flow sensor is installed on the main pipeline; the negative pressure source is installed with a pressure gauge switch; the vacuum suction nozzle is arranged in two groups; the two groups of vacuum suction nozzles are respectively connected to the other end of the main pipeline through branch pipelines; a vacuum solenoid valve is installed at the connection position between the main pipeline and the two branch pipelines; the PLC controller is respectively connected to the flow sensor and the vacuum solenoid valve.

[0007] The packaging machine bag suction detection device provided by the utility model only needs to be connected in series with the air pipe of the packaging machine's bag suction mechanism when in use. When the vacuum suction nozzle sucks the packaging bag, the signal frequency output by the flow sensor is low. When the vacuum suction nozzle does not suck the packaging bag, air will pass through the vacuum suction nozzle, the vacuum solenoid valve, and the flow sensor to reach the negative pressure source. When air continues to pass through the flow sensor, the PLC controller immediately closes the vacuum solenoid valve and stops the bag filling operation.

[0008] Preferably, the packaging machine bag suction detection device is connected in series in the air pipe of the packaging machine bag suction mechanism.

[0009] Preferably, the negative pressure source includes a vacuum pump and a gas tank, the gas tank is connected to the vacuum pump through a gas pipe; the gas tank is connected to one end of the main pipeline; the gas tank is installed with the pressure gauge switch.

[0010] Preferably, the vacuum pump is provided with a motor, and the pressure gauge switch is connected to the motor.

[0011] Preferably, the vacuum nozzle is configured to be in a soft bell-mouth shape.

[0012] Preferably, the number of the vacuum nozzles in each group is set to one.

[0013] Preferably, the bell mouths of the two groups of vacuum nozzles are directed towards each other.

[0014] Preferably, three holes are provided on the side wall of the gas storage tank, and the three holes are respectively connected to the gas pipe, the pressure gauge switch and the main pipeline.

[0015] The bag suction detection device for a packaging machine provided by the utility model has the following beneficial effects:

[0016] The bag suction detection device for a packaging machine of the present invention can solve the problem of inaccurate detection caused by the easy false triggering or detection failure in the existing detection method of whether the packaging bag is opened. It determines whether the vacuum suction nozzle has sucked the packaging bag by detecting the flow rate, which is conducive to avoiding false triggering or detection failure and improving detection accuracy and efficiency. It has a reasonable structure and is easy to install. When in use, it only needs to be connected in series in the air pipe of the bag suction mechanism of the packaging machine. It is conducive to reducing costs, reducing weight and reducing volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a bag suction detection device for a packaging machine provided by one embodiment of the present utility model.

[0018] Reference numerals in the figures:

[0019] 100 is the packaging bag, 1 is the negative pressure source, 110 is the vacuum pump, 120 is the gas storage tank, 210 is the main pipeline, 220 is the branch pipeline, 3 is the flow sensor, 4 is the pressure gauge switch, 5 is the vacuum nozzle, 6 is the vacuum solenoid valve, and 7 is the gas pipe. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below through the accompanying drawings and specific implementation methods.

[0021] Example

[0022] Please refer to Figure 1This embodiment provides a bag suction detection device for a packaging machine, including a negative pressure source 1, a vacuum suction nozzle 5, and a PLC controller. The negative pressure source 1 is connected to one end of a main pipeline 210, and a flow sensor 3 is installed on the main pipeline 210; a pressure gauge switch 4 is installed on the negative pressure source 1; the vacuum suction nozzle 5 is provided in two groups; the two groups of vacuum suction nozzles 5 are respectively connected to the other end of the main pipeline 210 through branch pipelines 220; a vacuum solenoid valve 6 is installed at the connection position between the main pipeline 210 and the two branch pipelines 220; and the PLC controller is respectively connected to the flow sensor 3 and the vacuum solenoid valve 6.

[0023] The packaging machine bag suction detection device of this embodiment, when in use, is connected in series to the air pipe of the packaging machine's bag suction mechanism, that is, the negative pressure source 1 is connected to the air pipe. When the vacuum suction nozzle 5 is sucking the packaging bag 100, the signal output by the flow sensor 3 has a low frequency, and the PLC controller's single-chip microcomputer software can filter out the low-frequency components of the signal. When the vacuum suction nozzle 5 is not sucking the packaging bag 100, air will pass through the vacuum suction nozzle 5, the vacuum solenoid valve 6, and the flow sensor 3 to reach the negative pressure source 1. If air continues to pass through the flow sensor 3, the PLC controller immediately closes the vacuum solenoid valve 6, stopping the filling operation of the packaging bag 100, for example, stopping the filling of the medicine bag. At this time, the PLC controller can be connected to an alarm to process the alarm.

[0024] The bag suction detection device of the packaging machine of this embodiment can also be installed at the bag taking station of the packaging bag 100 to detect whether the bag taking station is short of bags or has not sucked bags.

[0025] Specifically, the barometer switch 4 can be a digital pressure switch from a conventional product. The barometer switch 4 is configured as a negative pressure switch. When the pressure reaches a set negative pressure value, the contacts open. When the pressure falls below the set negative pressure value, the contacts close, thereby controlling the operation of the negative pressure source 1. The combination of the barometer switch 4 and the pressure gauge allows for real-time monitoring of gas pressure.

[0026] Flow sensor 3 can be an existing product. A liquid flow sensor with a gear, such as a liquid flow Hall effect sensor, can be used to reduce costs. Liquid flow sensors detect liquid flow and velocity by measuring the gear rotational speed. In this embodiment, the gear rotational speed is used to detect gas flow and velocity. Air flowing through the gears causes them to rotate. Gears are highly sensitive; faster gear rotation indicates a faster gas flow rate.

[0027] The vacuum solenoid valve 6 can be a product of existing technology. The vacuum solenoid valve 6 can be powered by 24V DC and can cut off the gas circuit; it is used to cut off the negative pressure and realize the control of the vacuum nozzle 5.

[0028] The vacuum suction nozzle 5 can be a vacuum suction cup in the prior art. The packaging bag 100 can be a rigid vertical packaging bag in the prior art product.

[0029] In some embodiments, the negative pressure source 1 includes a vacuum pump 110 and a gas tank 120, the gas tank 120 is connected to the vacuum pump 110 through a gas pipe 7; the gas tank 120 is connected to one end of the main pipeline 210; and the gas tank 120 is installed with a pressure gauge switch 4.

[0030] When the packaging machine bag suction detection device of this embodiment is used, the vacuum pump 110 is connected to the air pipe. When the vacuum suction nozzle 5 does not suck the packaging bag 100, air will reach the air storage tank 120 through the vacuum suction nozzle 5, the vacuum solenoid valve 6, and the flow sensor 3.

[0031] The vacuum pump 110 and the gas storage tank 120 are combined with the pressure gauge switch 4 to form a negative pressure system for providing gas negative pressure energy.

[0032] Specifically, when the pressure is less than the set negative pressure value, the pressure gauge switch 4 connects the contacts, thereby controlling the operation of the vacuum pump 110 .

[0033] The vacuum pump 110 can be a suction and exhaust pump of a prior art product. The vacuum pump 110 can be driven by a 24V power supply.

[0034] Specifically, three holes are provided on the side wall of the gas storage tank 120, and the three holes are respectively connected to the gas delivery pipe 7, the pressure gauge switch 4 and the main pipeline 210. The gas storage tank 120 can be set as a sealed steel cylinder.

[0035] In some embodiments, the vacuum pump 110 is provided with a motor, and the pressure gauge switch 4 is connected to the motor.

[0036] In some embodiments, the vacuum nozzle 5 is configured to be in a soft bell-shaped shape for sucking the material of the packaging bag 100 .

[0037] Specifically, the number of vacuum nozzles 5 in each group is set to one.

[0038] The bell mouths of the two groups of vacuum nozzles 5 are facing each other.

[0039] Specifically, the flow sensor 3 is located at the front end of the vacuum solenoid valve 6, and the vacuum nozzle 5 is located at the rear end of the vacuum solenoid valve 6. Figure 1 left and right directions shown.

[0040] The bag suction detection device of the packaging machine of the embodiment can utilize the pulse characteristics of the liquid flow sensor, count the gas flow frequency and the acceleration and deceleration of the frequency through the single-chip microcomputer of the PLC controller, and then judge the following multiple states: the normal state is that the frequency is zero, the gear does not rotate, and the liquid flow sensor outputs a relatively stable low-frequency signal when there is a slight air leakage; when the acceleration and deceleration is small, it is a normal phenomenon caused by the residual air in the air pipe impacting the gear after the vacuum electromagnetic valve 6 is opened, and thus the action of the vacuum electromagnetic valve 6 can be self-checked. When the vacuum electromagnetic valve 6 is opened, the vacuum suction nozzle 5 does not suck the packaging bag 100, or the packaging bag 100 falls off in the middle of being sucked, at this time the liquid flow sensor has a rapid acceleration process, and the high-frequency part lasts for a long time, a time is set in the single-chip microcomputer of the PLC controller, when the preset frequency lasts for a preset second, it is judged that the vacuum suction nozzle 5 does not suck the packaging bag 100, at this time the vacuum electromagnetic valve 6 is closed; the vacuum suction nozzle 5 is moved to the vicinity of the packaging bag 100, the vacuum electromagnetic valve 6 is opened again, whether the bag is successfully sucked is judged according to the frequency measured by the liquid flow sensor, if yes, the next step is performed, if not, the packaging bag 100 is not subjected to the material injection work, and manual intervention is performed.

[0041] The above embodiments are only examples for clearly illustrating, but not limiting the embodiments. Other different forms of changes or variations can be made by those skilled in the art on the basis of the above description. All the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the utility model.

[0042] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0043] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element has a particular orientation, is constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

Claims

1. A bag suction detection device for a packaging machine, characterized in that: include: A negative pressure source is connected to one end of the main pipeline, and a flow sensor is installed on the main pipeline; a pressure gauge switch is installed on the negative pressure source; The vacuum nozzles are provided in two groups; the two groups of vacuum nozzles are respectively connected to the other end of the main pipeline through branch pipelines; a vacuum solenoid valve is installed at the connection position between the main pipeline and the two branch pipelines; A PLC controller is connected to the flow sensor and the vacuum solenoid valve respectively.

2. The bag suction detection device for a packaging machine according to claim 1, characterized in that: The packaging machine bag suction detection device is connected in series in the air pipe of the packaging machine bag suction mechanism.

3. The bag suction detection device for a packaging machine according to claim 1 or 2, characterized in that: The negative pressure source includes a vacuum pump and an air tank, the air tank is connected to the vacuum pump through an air pipe; the air tank is connected to one end of the main pipeline; the air tank is installed with the pressure gauge switch.

4. The bag suction detection device for a packaging machine according to claim 3, characterized in that: The vacuum pump is provided with a motor, and the pressure gauge switch is connected to the motor.

5. The bag suction detection device for a packaging machine according to claim 1, characterized in that: The vacuum suction nozzle is configured in a soft bell-mouth shape.

6. The bag suction detection device for a packaging machine according to claim 5, characterized in that: The number of the vacuum nozzles in each group is set to one.

7. The bag suction detection device for a packaging machine according to claim 6, characterized in that: The bell mouths of the two groups of vacuum nozzles are directed toward each other.

8. The bag suction detection device for a packaging machine according to claim 3, characterized in that: The side wall of the gas storage tank is provided with three holes, and the three holes are respectively connected to the gas pipe, the pressure gauge switch and the main pipeline.

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