Extruder feeding device capable of automatically cleaning material level sensor

Abstract

The utility model provides an extruder feeding device capable of automatically cleaning a material level sensor, which comprises a hopper, a conveying device, a stock bin, a cleaning device and a programmable logic controller (PLC) control system, the conveying device comprises a material channel, a screw rod and a driving motor, the screw rod is arranged in the material channel, and the material level sensor is arranged in the material channel. One end of the hopper penetrates through the material channel and is connected with the output end of the driving motor, and the hopper is arranged on a feeding port of the material channel; an upper sensor is arranged at the upper end of the inner wall of the stock bin, and a lower sensor is arranged at the lower end of the inner wall of the stock bin; the cleaning device is arranged on the side wall of the stock bin and used for cleaning the upper sensor and the lower sensor. And the PLC control system is in communication connection with the driving motor, the upper sensor, the lower sensor and the cleaning device. The automatic cleaning device is simple in structure, convenient to operate and capable of automatically cleaning the sensor and avoiding production interruption or poor product quality caused by material sticking on the sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a feeding device of an extruder capable of automatically cleaning a material level sensor. Background Art

[0002] A cable is usually a rope-like cable made up of several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and often twisted around a center wire, with the entire outside covered with a highly insulating covering.

[0003] At present, when producing the insulation layer, an extruder is required to heat-melt the polymer insulation material and store it in the extruder. As the conductor enters the extruder, it is coated on the conductor and extruded out of the extruder together with the conductor to form an insulation layer. The existing extruder feeding device generally adopts a control method in which a motor drives the screw to automatically discharge the material into the "bin". There is a "lower limit" sensor and an "upper limit" sensor on the bin. When the material level is lower than the lower limit sensor, the motor drives the screw to stir and push the material. When the material level in the bin reaches the upper limit sensor, the motor stops. However, some insulation materials are sticky, and there is static electricity. Most of the insulation materials need to be dried with hot air before discharging (making the insulation particles more sticky). It is easy to cause the bin to be empty, but two or three particles will stick to the end face of the sensor, causing the sensor to mistakenly detect that there is still material, resulting in production interruption or poor product quality. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a sensor with simple structure and convenient operation, which can realize automatic cleaning of the sensor and avoid production interruption or poor product quality caused by sticky materials on the sensor.

[0005] The utility model is implemented as follows: an extruder feeding device for automatically cleaning a material level sensor comprises:

[0006] A hopper;

[0007] A conveying device, comprising a material channel, a screw and a driving motor, wherein the screw is arranged in the material channel, one end of the screw passes through the material channel and is connected to the output end of the driving motor, and the hopper is arranged on the feeding port of the material channel;

[0008] A material bin is arranged at the material outlet of the material channel, and an upper sensor is arranged at the upper end of the inner wall thereof, and a lower sensor is arranged at the lower end thereof;

[0009] a cleaning device, disposed on the side wall of the silo, for cleaning the upper sensor and the lower sensor;

[0010] A PLC control system is communicatively connected to the drive motor, the upper sensor, the lower sensor and the cleaning device.

[0011] Furthermore, the cleaning device includes a solenoid valve, a regulating valve and two air blowing connectors, the solenoid valve is connected to the regulating valve, the two air blowing connectors are connected to the regulating valve through an air pipe, the two air blowing connectors are arranged on the side wall of the silo, and blow air to the upper sensor and the lower sensor respectively, and the solenoid valve is connected to the PLC control system.

[0012] Furthermore, the cleaning device includes two driving cylinders and two cleaning plates, the two driving cylinders are arranged on the outer wall of the silo, the output shafts of the driving cylinders pass through the side wall of the silo, the two cleaning plates are respectively arranged on the output shafts of the driving cylinders, and respectively correspond to the upper sensor and lower sensor surfaces, and the driving cylinders are connected to the PLC control system.

[0013] Furthermore, the side wall of the silo is provided with an observation window, and a transparent glass is provided on the observation window.

[0014] Furthermore, the extruder feeding device also includes an alarm device, and the alarm device is connected to the PLC control system.

[0015] The utility model has the advantages that an upper sensor and a lower sensor are arranged in the silo to sense the material level; and a cleaning device can be used to clean the sticky material on the upper sensor and the lower sensor in time to avoid misjudgment, resulting in production interruption or poor product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0017] Figure 1 The utility model is a structural schematic diagram of a first embodiment of an extruder feeding device for automatically cleaning a material level sensor.

[0018] Figure 2 It is a structural schematic diagram of a second embodiment of an extruder feeding device for automatically cleaning a material level sensor according to the utility model.

[0019] Explanation of the accompanying drawings: extruder feeding device 100, hopper 1, conveying device 2, material channel 21, screw 22, driving motor 23, silo 3, upper sensor 31, lower sensor 32, observation window 33, cleaning device 4, solenoid valve 41, regulating valve 42, blowing joint 43, air pipe 44, driving cylinder 45, cleaning plate 46, PLC control system 5, alarm device 6. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1

[0022] like Figure 1 As shown, an extruder feeding device 100 for automatically cleaning a material level sensor includes a hopper 1, a conveying device 2, a silo 3, a cleaning device 4, a PLC control system 5 and an alarm device 6.

[0023] The hopper 1 is used for containing insulating materials.

[0024] The conveying device 2 includes a material channel 21, a screw 22 and a driving motor 23. The screw 22 is arranged in the material channel 21, one end of which passes through the material channel 21 and is connected to the output end of the driving motor 23. The hopper 1 is arranged on the feeding port of the material channel 21. The insulating material in the hopper 1 enters from the feeding port of the material channel 21, and the screw 22 is driven to rotate by the driving motor 23, thereby driving the insulating material forward.

[0025] The silo 3 is arranged at the discharge port of the material channel 21, and the screw 22 drives the insulating material forward and enters the silo 3 from the discharge port of the material channel 21. An upper sensor 31 is provided at the upper end of the inner wall of the silo 3, and a lower sensor 32 is provided at the lower end. When the material level is lower than the lower sensor, the driving motor 23 drives the screw 22 to stir and push the material. When the material level in the silo 3 reaches the upper sensor, the driving motor 23 stops. An observation window 33 is provided on the side wall of the silo 3, and a transparent glass is provided on the observation window 33. The observation window 33 is provided to facilitate the staff to observe the situation in the silo 3 more directly.

[0026] The cleaning device 4 includes a solenoid valve 41, a regulating valve 42 and two air blowing joints 43, wherein the solenoid valve 41 is connected to the regulating valve 42, and the two air blowing joints 43 are connected to the regulating valve 42 through an air pipe 44, and the two air blowing joints 43 are arranged on the side wall of the silo 3, and respectively blow air to the upper sensor 31 and the lower sensor 32, and the solenoid valve 41 is connected to the PLC control system 5. The solenoid valve 41 is controlled by the PLC control system 5 to realize automatic air blowing, and the pressure regulating valve 42 is used to adjust the appropriate air volume and pressure, and the air blowing joints 43 are added to the sides of the upper and lower sensors to blow air to them, so as to avoid production interruption or defect caused by the sticking of the upper sensor 31 and the lower sensor 32.

[0027] The PLC control system 5 is communicatively connected to the drive motor 23 , the upper sensor 31 , the lower sensor 32 , an alarm device 6 and the solenoid valve 41 .

[0028] Working principle: When the material level is lower than the lower sensor 32, the lower sensor 32 sends a signal to the PLC control system 5, and the PLC control system 5 controls the drive motor 23 to drive the screw 22 to stir and push the material, so that the insulating material in the hopper 1 enters the silo 3 through the material channel 21. When the material level in the silo 3 reaches the upper sensor 31, the upper sensor 31 sends a signal to the PLC control system 5 to control the drive motor 23 to stop; and in the normal unloading process, the solenoid valve 41 controls the air blowing joint 43 to blow air for 1.5 seconds every 90 seconds. If there is sticky material between the upper sensor 31 and the lower sensor 32, If there is any problem, it will be blown off in time to avoid production interruption or poor product quality; when the lower sensor 32 in the silo 3 detects that there is no material, but the upper sensor 31 of the silo 3 detects that there is material, it is very likely that the upper sensor 31 is stuck with material, and the PLC control system 5 immediately controls the solenoid valve 41 to blow air to the upper sensor 31 and alarm through the alarm device 6. The utility model controls the solenoid valve 41 through the PLC control system 5 to realize automatic blowing, adjusts the appropriate air volume and pressure through the pressure regulating valve 42, and adds blowing joints on the sides of the upper and lower sensors to blow air to avoid production interruption or poor quality caused by sticking materials.

[0029] Embodiment 2

[0030] like Figure 2 As shown, the second embodiment is basically the same as the first embodiment, except that the cleaning device 4 includes two driving cylinders 45 and two cleaning plates 46, the two driving cylinders 45 are arranged on the outer wall of the silo 3, the output shaft of the driving cylinder 45 passes through the side wall of the silo, the two cleaning plates 46 are respectively arranged on the output shaft of the driving cylinder 46, and respectively move on the surface of the upper sensor 31 and the lower sensor 32, and the cleaning plates 46 are moved on the surface of the upper sensor 31 and the lower sensor 32 by the extension and retraction of the output shaft of the driving cylinder 46 to clean the sticky material on the surface of the upper and lower sensors.

[0031] Its working principle is similar to that of the first embodiment. During the normal unloading process, the output shaft of the driving cylinder 45 is extended and retracted once every 90 seconds, so that the cleaning plate 46 cleans the surface of the upper sensor 31 and the lower sensor 32 once. If the upper sensor 31 and the lower sensor 32 are sticky, they will be cleaned in time to avoid production interruption or poor product quality. When the lower sensor 31 in the silo 3 detects that there is no material, but the upper sensor 31 in the silo 3 detects that there is material, it is likely that the upper sensor 31 is stuck. The PLC control system 5 immediately controls the driving cylinder 45 to start cleaning the upper sensor 31 and alarm through the alarm device 6. The driving cylinder 45 is controlled by the PLC control system 5 to achieve automatic cleaning to avoid production interruption or poor product quality caused by sticky materials.

[0032] The utility model has a simple structure and is easy to operate. An upper sensor 31 and a lower sensor 32 are arranged in the silo 3 to sense the material level. A cleaning device 4 can be used to clean the sticky material on the upper sensor and the lower sensor in time to avoid misjudgment, resulting in production interruption or poor product quality.

[0033] Although the specific implementation methods of the present invention are described above, those skilled in the art should understand that the specific embodiments described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An extruder feeding device with automatic cleaning of material level sensor, characterized in that: include A hopper; A conveying device, comprising a material channel, a screw and a driving motor, wherein the screw is arranged in the material channel, one end of the screw passes through the material channel and is connected to the output end of the driving motor, and the hopper is arranged on the feeding port of the material channel; A material bin is arranged at the material outlet of the material channel, and an upper sensor is arranged at the upper end of the inner wall thereof, and a lower sensor is arranged at the lower end thereof; a cleaning device, disposed on the side wall of the silo, for cleaning the upper sensor and the lower sensor; A PLC control system is communicatively connected to the drive motor, the upper sensor, the lower sensor and the cleaning device.

2. The extruder feeding device for automatically cleaning the material level sensor according to claim 1, characterized in that: The cleaning device includes a solenoid valve, a regulating valve and two air blowing joints. The solenoid valve is connected to the regulating valve. The two air blowing joints are connected to the regulating valve through an air pipe. The two air blowing joints are arranged on the side wall of the silo and blow air to the upper sensor and the lower sensor respectively. The solenoid valve is connected to the PLC control system.

3. The extruder feeding device for automatically cleaning the material level sensor according to claim 1, characterized in that: The cleaning device includes two driving cylinders and two cleaning plates. The two driving cylinders are arranged on the outer wall of the silo. The output shafts of the driving cylinders pass through the side wall of the silo. The two cleaning plates are respectively arranged on the output shafts of the driving cylinders and respectively move correspondingly on the surfaces of the upper sensor and the lower sensor. The driving cylinders are connected to the PLC control system.

4. An extruder feeding device for automatically cleaning a material level sensor according to claim 2 or 3, characterized in that: The side wall of the silo is provided with an observation window, and a transparent glass is provided on the observation window.

5. The extruder feeding device for automatically cleaning the material level sensor according to claim 1, characterized in that: The extruder feeding device also includes an alarm device, which is connected to the PLC control system.

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