A detection system for the rolled edge of the bag mouth of the packaging bag used in an automatic paste resin packaging machine

Abstract

The present invention discloses a detection system for the edge curling of the bag mouth of a packaging bag used in an automatic paste resin packaging machine, which includes a pneumatic subsystem and a detection subsystem. The pneumatic subsystem includes a gas source, a gas valve, and an air duct provided circumferentially around the nozzle of the automatic paste resin packaging machine. The air outlet end of the air duct is provided on the circumferential side wall of the nozzle, and the gas source is connected to the air duct through the gas valve. The detection subsystem includes a barometric pressure acquisition device and a linear push rod device. The end of the push rod in the linear push rod device points to the air outlet end of the air duct. There is an inner cavity in the push rod and an orifice is provided at the rod end. Air holes are provided on the circumferential side wall of the push rod. The detection part of the barometric pressure acquisition device is communicated with the air holes of the linear push rod device. The present invention can detect whether the bag mouth of the packaging bag in the automatic paste resin packaging machine is curled, thereby avoiding the problem that the paste resin material sprays out from the curled edge of the bag mouth of the packaging bag during the filling process of the automatic paste resin packaging machine.

Description

Technical Field

[0001] The present invention relates to the field of automatic packaging machines for paste resins, and particularly to a bag mouth curling detection system for an automatic packaging machine for paste resins. Background Art

[0002] At present, paste resin products with an annual output of 100,000 tons are generally packaged by an automatic packaging machine for paste resins. During the packaging process of the automatic packaging machine for paste resins, a bag-taking machine obtains packaging bags from a bag library through suction cups, raises the packaging bags to a fixed position, then opens the bag mouths through opening suction cups, and then sets the bag mouths of the packaging bags on the nozzles for filling paste resins in the automatic packaging machine for paste resins. During the process of setting the bag mouths, the movement position of the bag mouths is obtained through a travel switch. When the bag mouths of the packaging bags are set to the root of the nozzles, the travel switch generates a signal and sends it to the controller of the automatic packaging machine for paste resins. At this time, the controller controls the filling system to fill the packaging bags with materials through the nozzles.

[0003] Since the material of the packaging bags is mainly polypropylene, the bag mouths will be curled due to the influence of environmental temperature and transportation. Therefore, when the bag mouths are set on the nozzles, the travel switch still generates a signal and sends it to the controller, and the controller controls the filling system to fill the packaging bags with materials through the nozzles. Due to curling at some positions, the paste resin materials will be sprayed out from the curled positions during filling, resulting in waste of materials, a decrease in filling speed, pollution to the surrounding environment, and the sprayed materials will also endanger the personal safety of the surrounding workers. Summary of the Invention

[0004] The present invention provides a bag mouth curling detection system for an automatic packaging machine for paste resins to solve the problem of material waste caused by the inability of the existing automatic packaging machine for paste resins to detect the curling of the bag mouths of the packaging bags.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A bag mouth curling detection system for an automatic packaging machine for paste resins includes an air path subsystem and a detection subsystem, wherein: the air path subsystem includes an air source, an air valve, and a plurality of air paths. The air outlet ends of each air path are arranged on the circumferential side of the part of the nozzle in the automatic packaging machine for paste resins where the bag mouths of the packaging bags are set, and the air inlet ends of each air path are connected to the air source through the air valve;

[0007] The detection subsystem includes a pneumatic pressure acquisition device and a number of linear push rod devices. The linear push rod device has a push rod that moves linearly. There is an inner cavity in the push rod, and the orifice of the inner cavity is provided at the rod end of the push rod. Air holes communicating with the inner cavity of the push rod are provided on the circumferential side surface of the push rod. Each linear push rod device is arranged outside the circumference of the nozzle in the paste resin automatic packaging machine, and the positions of each linear push rod device correspond one by one to the air outlet ends of the air ducts. The rod end of each linear push rod device points to the air outlet end of the corresponding air duct, and the detection part of the pneumatic pressure acquisition device is communicated with the air holes of each linear push rod device.

[0008] Further, the air duct is a hole provided in the circumferential side wall of the nozzle. One end orifice of the hole is provided on the outer surface of the circumferential side wall of the nozzle as the air outlet end, and the other end of the hole is used as the air inlet end and is connected to the air source through a pneumatic valve.

[0009] Further, the air outlet ends of each air duct are circumferentially distributed at equal intervals on the circumferential side surface of the nozzle.

[0010] Further, the linear push rod device is a cylinder, and the piston rod of the cylinder is used as the push rod.

[0011] Further, the linear push rod device is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is used as the push rod.

[0012] Further, the linear push rod device is a linear push rod motor, and the output shaft of the linear push rod motor is used as the push rod.

[0013] Further, the pneumatic pressure acquisition device is a pressure detection switch, and the detection part of the pressure detection switch is communicated with the air holes of each linear push rod device through a pipeline.

[0014] Further, a controller is further included. The controller is respectively electrically connected to the pneumatic valve and each linear push rod device for control, and the pneumatic pressure acquisition device is electrically connected to the controller for signal transmission.

[0015] Further, the travel switch for detecting the travel of the bag mouth of the packaging bag in the paste resin automatic packaging machine is electrically connected to the controller for signal transmission.

[0016] In the present invention, when the bag mouth of the packaging bag is sleeved on the nozzle, the controller controls the pneumatic valve to open, the air source conveys air flow to each air duct, and at the same time the controller controls the push rod in the linear push rod device to move towards the air outlet end of the corresponding air duct.

[0017] The air outlet ends of each air duct are provided on the circumferential side surface of the part of the nozzle where the bag mouth of the packaging bag is sleeved. Therefore, if the bag mouth of the packaging bag has no curled edge, the air outlet end of each air duct will be blocked by the bag mouth. At this time, when the rod end of the push rod of the linear push rod device reaches the air outlet end of the corresponding air duct, there is the bag mouth of the packaging bag between the rod end of the push rod and the air outlet end of the air duct, and there is no air flow passing through the inside of the push rod, so the pneumatic pressure acquisition device does not generate a signal.

[0018] If there is a curled edge at the bag mouth of the packaging bag, the air outlet end of the air duct corresponding to the curled edge is not blocked by the corresponding position of the bag mouth of the packaging bag, and the air outlet end of the air duct is in an open state. At this time, when the rod end of the push rod of the linear push rod device reaches the air outlet end of the corresponding air duct, the rod end of the push rod and the air outlet end of the air duct are connected to each other, the air flow in the air duct enters the inside of the push rod, and enters the air pressure acquisition device through the push rod, and then the air pressure acquisition device generates a signal to the controller.

[0019] Based on the above process, the present invention can detect whether there is a curled edge at the bag mouth of the packaging bag. Thus, the control system of the automatic packaging machine for paste resin can judge whether to fill the material based on the curled edge condition of the bag mouth of the packaging bag, and further avoid the paste resin material from spraying out from the curled edge of the bag mouth of the packaging bag, solving the waste of materials and the pollution of the surrounding environment caused by the curled edge problem. The whole process can be automated without manual detection, thereby improving the packaging work efficiency. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. Detailed Embodiments

[0021] The present invention will be further described below with reference to the drawings and embodiments.

[0022] As Figure 1 shown, this embodiment discloses a detection system for the curled edge of the bag mouth of a packaging bag for an automatic paste resin packaging machine, including an air duct subsystem, a detection subsystem and a controller 1. In this embodiment, the air duct subsystem includes an air source, a plurality of air valves and a plurality of air ducts 4. Among them, the air duct 4 is a hole in the circumferential side wall of the nozzle 5 for filling the paste resin in the automatic packaging machine. Specifically, a plurality of holes are processed in the circumferential side wall of the part where the bag mouth of the packaging bag 2 is correctly sleeved on the nozzle 5 (generally the root of the nozzle 5) as the air duct 4. One end orifice of each hole is arranged on the circumferential side wall of the nozzle 5 as the air outlet end of the air duct 4, and the other end orifice of each hole is arranged at the axial end of the nozzle 5 as the air inlet end of the air duct 4. The number of air valves is the same as the number of air ducts 4, and the air outlet of the air valve is connected to the air inlet end of the air duct 4 through pipelines one by one, and the air inlets of each air valve are respectively connected to the air source through pipelines.

[0023] In this embodiment, the controller 1 adopts a PLC controller, and the signal output end of the controller 1 is electrically connected to the control ends of each air valve respectively. Thus, the controller 1 can control each air valve to be turned on or off. When the air valve is turned on, the air source outputs air flow to the air duct 4 through the air valve, and finally the air flow can flow out from the air outlet end of the air duct 4.

[0024] In this embodiment, the air channels 4 are circumferentially distributed at equal intervals on the circumferential side wall of the nozzle 5, and the air channels 4 are located on the same circumferential ring of the circumferential side wall of the nozzle 5. The air outlet ends of the air channels 4 are also circumferentially distributed at equal intervals. Thus, the air flow flowing out from the air channels 4 exits radially along the nozzle 5.

[0025] Of course, the air channels 4 in this embodiment can also adopt embedded tracheas, that is, a plurality of grooves are provided on the circumferential side wall of the nozzle 5, and the trachea is embedded into the grooves as the air channels 4.

[0026] The detection subsystem includes a plurality of air pressure acquisition devices 6 and a plurality of linear push rod devices 7. In this embodiment, the air pressure acquisition device 6 is a pressure detection switch, and the linear push rod device 7 is a linear push rod motor or a hydraulic cylinder or a pneumatic cylinder with a push rod component.

[0027] In this embodiment, an inner cavity is drilled inside the push rod of each linear push rod device 7. The rod end of the push rod is provided with an orifice of the inner cavity, and air holes are provided on the circumferential side surface of the push rod and communicated with the inner cavity. Specifically, when the linear push rod device 7 is a linear push rod motor, the output shaft of the linear push rod motor is used as the push rod; when the linear push rod device 7 is a hydraulic cylinder or a pneumatic cylinder, the piston rod is used as the push rod.

[0028] The number of the linear push rod devices 7 is the same as the number of the air channels 4. The linear push rod devices 7 are circumferentially distributed outside the circumference of the nozzle 5, and the positions of the linear push rod devices 7 correspond to the air outlet ends of the air channels 4 one by one. The rod end of the push rod of each linear push rod device 7 points to the air outlet end of the corresponding air channel 4. Thus, the push rod of the linear push rod device 7 can move to the rod end to be butt-connected and communicated with the air outlet end of the air channel 4 to form an air path. When gas flows out from the air channel 4, the air flow can enter the push rod of the linear push rod device 7.

[0029] The number of the air pressure acquisition devices 6 is the same as the number of the linear push rod devices 7, and the air pressure acquisition devices 6 and the linear push rod devices 7 work in cooperation corresponding to each other. The detection part of the air pressure acquisition device 6 is communicated with the air holes of the push rod in the corresponding linear push rod device 7 through a pipeline. When air flow passes through the push rod, the air flow finally enters the detection part of the air pressure acquisition device 6 from the air holes of the push rod. At this time, the air pressure acquisition device 6 generates an electrical signal.

[0030] In this embodiment, the signal output end of the controller 1 is electrically connected to the control ends of the respective linear push rod devices 7. Thus, the controller 1 can control the actions of the respective linear push rod devices 7. The signal input end of the controller 1 is connected to the signal output ends of the respective air pressure acquisition devices 6. Thus, the controller 1 can obtain the electrical signals generated by the respective air pressure acquisition devices 6.

[0031] In this embodiment, the signal input end of the controller 1 is further connected to the signal output end of the travel switch 3 for detecting the movement position of the mouth of the packaging barrel in the paste resin automatic packaging machine. Thus, the controller 1 can obtain the electrical signal generated by the travel switch 3. At the same time, the controller 1 is also communicatively connected to the control system of the paste resin automatic packaging machine. Thus, the controller 1 can realize data interaction with the control system of the paste resin automatic packaging machine.

[0032] In this embodiment, when the mouth of the packaging bag 2 is sleeved to the root of the nozzle 5 in the paste resin automatic packaging machine, the travel switch 3 generates a signal. After the controller 1 obtains the signal of the travel switch 3, it controls the air valve to conduct and controls the operation of each linear push rod device 7. The push rod of each linear push rod device 7 moves towards the air outlet end of the corresponding air duct 4 respectively.

[0033] If there is a curled edge at the mouth of the packaging bag 2, the air outlet end of the air duct 4 at the corresponding position of the curled edge is not blocked by the corresponding position of the mouth of the bag, and the air outlet end of the air duct 4 at the corresponding position of the curled edge is in an open state. When the rod end of the push rod of the linear push rod device 7 at the corresponding position is docked to the air outlet end of the air duct 4, the air flow output by the air source enters the push rod through the air duct 4 and finally enters the air pressure acquisition device 6 from the push rod. At this time, the air pressure acquisition device 6 generates an electrical signal and sends it to the controller 1.

[0034] The numbers of each air pressure acquisition device 6 and linear push rod device 7 can be set in advance in the controller 1. When the controller 1 obtains the electrical signal of a certain air pressure acquisition device 6, the controller 1 can judge that there is a curled edge at the mouth of the packaging bag 2, and based on the circumferential position of the linear push rod device 7 corresponding to the air pressure acquisition device 6, the controller 1 can obtain the position of the curled edge. The judgment result of the controller 1 is transmitted to the control system of the paste resin automatic packaging machine, and the filling program is aborted by the control system of the paste resin automatic packaging machine, thus facilitating the problem of material spraying waste when filling materials into the packaging bag during curling.

[0035] The embodiments described in the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design idea of the present invention, various variations and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A bag mouth hemming detection system for an automatic packaging machine of paste resin, characterized in that, It includes an air path subsystem and a detection subsystem, where: the air path subsystem includes an air source, an air valve, and several air paths. The outlet ends of each air path are arranged on the circumferential side of the part where the nozzle of the paste resin automatic packaging machine is sleeved with the bag mouth of the packaging bag. The inlet ends of each air path are connected to the air source through the air valve; the detection subsystem includes a air pressure acquisition device and several linear push rod devices. The linear push rod device has a push rod that moves linearly. There is an inner cavity in the push rod, and the orifice of the inner cavity is arranged at the rod end of the push rod. Air holes communicating with the inner cavity of the push rod are arranged on the circumferential side of the push rod. Each linear push rod device is arranged outside the circumference of the nozzle in the paste resin automatic packaging machine, and the positions of each linear push rod device correspond one by one to the outlet ends of the air paths. The rod end of each linear push rod device points to the outlet end of the corresponding air path. The detection part of the air pressure acquisition device is communicated with the air holes of each linear push rod device; The air path is a hole channel arranged in the circumferential side wall of the nozzle. One orifice of the hole channel is arranged on the outer surface of the circumferential side wall of the nozzle as the outlet end, and the other end of the hole channel is used as the inlet end and is connected to the air source through the air valve; The outlet ends of each air path are circumferentially distributed at equal intervals on the circumferential side of the nozzle.

2. The bag mouth hemming detection system for an automatic packaging machine of paste resin according to claim 1, characterized in that, The linear push rod device is a cylinder, and the piston rod of the cylinder is used as the push rod.

3. The bag mouth hemming detection system for an automatic packaging machine of paste resin according to claim 1, characterized in that, The linear push rod device is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is used as the push rod.

4. The bag mouth hemming detection system for an automatic packaging machine of paste resin according to claim 1, characterized in that, The linear push rod device is a linear push rod motor, and the output shaft of the linear push rod motor is used as the push rod.

5. The bag mouth hemming detection system for an automatic packaging machine of paste resin according to claim 1, characterized in that, The air pressure acquisition device is a pressure detection switch, and the detection part of the pressure detection switch is communicated with the air holes of each linear push rod device through a pipeline.

6. The bag mouth hemming detection system for an automatic packaging machine of paste resin according to claim 1, characterized in that, It further includes a controller. The controller is respectively electrically connected to the control of the air valve and each linear push rod device. The air pressure acquisition device is electrically connected to the controller for signal transmission.

7. The bag mouth hemming detection system for an automatic packaging machine of paste resin according to claim 6, characterized in that, The travel switch for detecting the travel of the bag mouth of the packaging bag in the paste resin automatic packaging machine is electrically connected to the controller for signal transmission.

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