Intelligent detection sensor for spray nozzle blockage of full-automatic glue sprayer

[0014] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0015] As shown in the figure: the intelligent detection sensor for nozzle blockage of the automatic glue spraying machine is mainly composed of the detection body 1, the strain sensor 2, the cross recessed pan head screw 3, the body cover 4, the detection screw 5, the nut 6, the alarm 7, Cross recessed pan head screw 8, circuit board 9, flange 10, cross recessed pan head screw 11, sealing gasket 12, transition pipe joint 13, elastic steel sheet 14 and other components.

[0016] Such as figure 1 , figure 2 As shown, the detection body 1 is provided with a paint channel 1a with a diameter of Φ8mm. The two ends of the paint channel 1a are threadedly connected with transition pipe joints 13, and the transition pipe joint 13 at one end of the paint channel 1a is used to connect the spraying pipeline, and the paint channel 1a The transition pipe joint 13 at the other end is used to connect the nozzle.

[0017] The detection body 1 is provided with a cavity, and the center of the bottom of the cavity is provided with a detection hole 1b communicating with the paint channel 1a. The elastic steel sheet 14 is installed at the bottom of the cavity, and the elastic steel sheet 14 is pressed by the flange 10 Tightly fixed; the flange 10 is fixed on the detection body 1 with a cross recessed pan head screw 8, a sealing gasket 12 is sandwiched between the outer circumference of the lower end of the flange 10 and the elastic steel sheet 14; because the paint usually contains Corrosive substances such as xylene and acetone, so the sealing gasket 12 is preferably made of Teflon anti-corrosion material to improve the service life of the present invention.

[0018] The detection body 1 is tightly combined with a body cover 4, and the detection body 1 and the body cover 4 constitute a sealed detection chamber, which is a space for pressure measurement and blockage determination; the strain sensor 2 is installed in the detection chamber One end of the strain sensor 2 is fixed on the high platform 1c on one side of the detection body 1 by a cross recessed pan head screw 3, and the other end of the strain sensor 2 is suspended in the air. The strain sensor 2 is the core part of the intelligent detection sensor. The strain sensor 2 can transfer the pressure change of the paint channel 1a caused by the clogging of the nozzle to the remote strain gauge, and use the microprocessor to monitor the status of the strain gauge in real time. Change to determine whether the nozzle is clogged. This design method has the following advantages: 1. The strain sensor 2 will not be damaged due to the corrosiveness of the paint; 2. There will be no paint deposition on the strain sensor 2, and the sensitivity will not be affected. 3. The microprocessor can monitor pipeline pressure changes in real time, with high accuracy and strong real-time performance. In the present invention, the strain sensor 2 can be selected from the general products in the prior art, such as the strain sensor 2 of model HL-8, which has the advantages of high pressure detection accuracy and strong corrosion resistance, and is particularly suitable For pressure detection of suspension liquids such as corrosive paints.

[0019] The detection screw 5 is arranged vertically, the upper end of the detection screw 5 is screwed on the strain sensor 2 and tightened by the nut 6, and the lower end of the detection screw 5 passes through the central hole of the flange plate 10 and closely contacts the elastic steel sheet 14. The screw 5 is used to transmit the pressure change of the paint passage 1a.

[0020] The circuit board 9 is arranged directly under the strain sensor 2, and the circuit board 9 is mounted on the detection body 1 by a cross recessed pan-head screw 11, and the circuit board 9 integrates a microprocessor, A/D conversion circuit, memory and power supply Management circuit, the A/D conversion circuit on the circuit board 9 is electrically connected to the strain sensor 2; the above-mentioned microprocessor, A/D conversion circuit, memory and power management circuit are the core pressure acquisition and processing devices of the intelligent detection sensor of the present invention .

[0021] The detection body 1 and the body cover 4 are made of stainless steel materials, so that the intelligent detection sensor of the present invention has the advantages of strong corrosion resistance, oxidation resistance, and resistance to damage. An alarm 7 is installed on the inner wall of the body cover 4, and the alarm 7 is electrically connected to a microprocessor integrated on the circuit board 9. The alarm 7 preferably adopts a buzzer.

[0022] When in use, the intelligent detection sensor of the present invention is directly connected to the paint spraying pipeline and fixed by the cross recessed countersunk screw 15. The specific working process is as follows:

[0023] When the automatic glue spraying machine is working normally, the elastic steel sheet 14 and the strain sensor 2 are in the initial state. The intelligent detection sensor of the present invention records the pressure situation of the paint channel 1a at this time, and sets the system threshold according to the value of the strain sensor 2 at this time. When the nozzle is blocked (partially or completely), the pressure of the paint channel 1a for conveying paint will change, causing the elastic steel sheet 14 to undergo an upward elastic deformation. The elastic deformation is transmitted to the strain sensor 2 through the detection screw 5. The strain sensor 2 detects the elastic deformation and converts it into a voltage signal. The voltage signal is converted into a digital signal by an A/D conversion circuit and collected by a microprocessor. The microprocessor performs real-time processing, analysis and calculation on the collected signal. Obtain the pressure change value of the paint channel 1a, and then judge whether the nozzle is blocked in real time according to the pressure change value. If the nozzle is blocked, an alarm signal is issued and the automatic glue spraying machine is controlled to stop, reminding the staff to deal with it in time. When the microprocessor detects that the pressure of the paint channel 1a returns to normal, it will also send out an alarm signal to cancel, and at the same time send a running signal to the automatic glue dispenser. In actual use, the intelligent detection sensor of the present invention has a very low false alarm rate, which can effectively ensure the normal operation of the automatic spraying machine, avoid the occurrence of missing or uneven spraying of the workpiece due to nozzle clogging, and ensure the spraying quality of the workpiece. Reduce industrial economic losses.