Online detection device for needle holes of latex gloves

Abstract

The utility model discloses an online detection device for needle holes of latex gloves, which comprises a conductive liquid tank filled with conductive liquid, a positive detection electrode is mounted on a frame fixedly arranged on the conductive liquid tank, and the positive detection electrode is in contact with a stainless steel glove model sleeved with the latex gloves on a latex glove production line. The output end of the detection module is connected with the positive detection electrode, the input end of the detection module is connected with the conductive liquid tank shell, the conductive liquid tank shell is connected with the grounding detection electrode, the positive detection electrode, the conductive liquid, the conductive liquid tank and the detection module form a loop, and whether pinholes exist in the rubber gloves or not is judged according to the change condition of current. According to the detection device, the production efficiency is improved, the production cost is saved, the detection accuracy is high, and the practicability is high.

Description

Technical Field

[0001] The utility model belongs to the field of glove pinhole detection, and particularly relates to an online pinhole detection device for latex gloves. Background Art

[0002] Currently, pinhole detection in latex gloves relies on an air blowing inspection method. This involves manually or automatically blowing air into the gloves to inflate them, then inspecting for air leaks to determine if there are any pinholes. This air blowing inspection method requires removing the gloves from the forming equipment after they have been formed, then placing them on the air blowing inspection equipment. This is labor-intensive and, because the amount of air that can be blown into the gloves is limited, blowing in too much air can cause the gloves to rebound poorly and deform. Blowing in too little air can make it difficult to detect tiny pinholes, leading to missed pinhole detections. Utility Model Content

[0003] The utility model aims to solve the deficiencies of the prior art and provide an online pinhole detection device for latex gloves. The device has high detection accuracy and strong practicality.

[0004] The technical solution for realizing the present utility model is:

[0005] An online pinhole detection device for latex gloves includes a conductive liquid tank filled with conductive liquid, a positive detection electrode mounted on a frame fixed to the conductive liquid tank, the positive detection electrode in contact with a stainless steel glove mold covered with latex gloves on a latex glove production line, an output end of a detection module connected to the positive detection electrode, an input end of the detection module connected to a conductive liquid tank housing, the conductive liquid tank housing connected to a grounded detection electrode, the positive detection electrode, the conductive liquid, the conductive liquid tank, and the detection module forming a loop, a control end of the detection module connected to a PLC controller, and the PLC controller connected to a touch screen.

[0006] The detection module includes an operational amplifier, wherein the seventh pin of the operational amplifier is connected to a +12V power supply, the fourth pin is connected to a -12V power supply and is connected to a conductive liquid tank housing, the second pin of the operational amplifier, a first resistor, a stainless steel glove model, a potentiometer, a second resistor, and a +12V power supply are connected in sequence, the second pin and the seventh pin of the operational amplifier are connected in parallel to a first capacitor, and the third pin is connected to a common-phase 12V power supply, the sixth pin of the operational amplifier is connected in series with the third resistor, and then connected in sequence to the fourth resistor and the third pin of the operational amplifier, and is also connected in sequence to an ammeter and a transistor b pole, the transistor e pole, the diode positive pole and the third pin of the operational amplifier are connected in sequence, the transistor c pole is connected to the negative pole of the relay coil, the relay coil positive pole is connected to a relay independent power supply +12, the relay independent power supply 0V end is connected to the third pin of the operational amplifier, and the relay coil is connected in parallel to the second capacitor; and the two endpoints of the relay normally open contact are respectively connected to the negative pole of a PLC and a PLC input end.

[0007] The detection voltage of the detection module is 100-1000V.

[0008] The conductive liquid is salt water with a concentration of 1%-3%.

[0009] The operational amplifier is µA741, the relay model is JZC-21F, the transistor model is 3DA128, and the diode model is IN4007.

[0010] The resistance of the first resistor is 1 / 2W, 2K, the resistance of the second resistor is 1 / 2W, 2M, the resistance of the third resistor is 1 / 2W, 2K, the resistance of the fourth resistor is 1 / 2W, 3.5K, the first capacitor is 0.01µF / 63V, the second capacitor is 50µF / 25V, the potentiometer is 1 / 2W, 2M, and the ammeter is 5mA.

[0011] This device can detect pinholes directly on the glove production line before the gloves are demoulded on the glove forming equipment, eliminating the need to conduct pinhole detection after the gloves are produced. This improves production efficiency, saves production costs, has high detection accuracy, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic structural diagram of the device in the embodiment;

[0013] Figure 2 This is a schematic structural diagram of the detection module in the embodiment;

[0014] In the figure: 1. Proximity switch 2. Signal wheel 3. Stainless steel glove model 4. Latex glove 5. Positive detection electrode 6. Frame 7. Conductive liquid tank 8. Ground detection electrode 9. Positive waste separation device 10. Solenoid valve 11 Detection module 12. PLC controller 13. Touch screen 14. Operational amplifier 15. Seventh pin 16. Fourth pin 17. Second pin 18. Third pin 19. Sixth pin 20. First resistor 21. Second resistor 22. Third resistor 23. Fourth resistor 24. First capacitor 25. Second capacitor 26. Potentiometer 27. Ammeter 28. Transistor 29. Diode 30. Relay DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the present invention is not limited thereto. Example

[0016] Reference Figure 1A device for online pinhole detection in latex gloves includes a conductive liquid tank 7 filled with a conductive liquid, a positive detection electrode 5 mounted on a frame 6 fixed to the conductive liquid tank 7, the positive detection electrode 5 in contact with a stainless steel glove former 3 covered with a latex glove 4 on a latex glove production line, an output end of a detection module 11 connected to the positive detection electrode 5, an input end of the detection module 11 connected to the outer shell of the conductive liquid tank 7, which is connected to a grounded detection electrode 8, the positive detection electrode 5, the conductive liquid, the conductive liquid tank 7, and the detection module 11 forming a loop, a control end of the detection module 11 connected to a PLC controller, and the PLC controller connected to a touch screen;

[0017] like Figure 2 As shown, the detection module 11 includes an operational amplifier 14, the seventh pin 15 of the operational amplifier 14 is connected to a +12V power supply, the fourth pin 16 is connected to a -12V power supply and is connected to the housing of the conductive liquid tank 7, the second pin 17 of the operational amplifier 14, the first resistor 20, the stainless steel glove model 3, the potentiometer 26, the second resistor 21, and the +12V power supply are connected in sequence, the second pin 17 and the seventh pin 15 of the operational amplifier 14 are connected in parallel with the first capacitor 24, the third pin 18 of the operational amplifier 14 is connected to the in-phase 12V power supply, the sixth pin 19 is connected in series with the third resistor 22 and then connected to the fourth resistor 2 3 is connected to the third pin 18 of the operational amplifier 14 in sequence, and is also connected to the ammeter 27 and the b pole of the transistor 28 in sequence, the e pole of the transistor 28 and the positive pole of the diode 29 are connected to the third pin 18 of the operational amplifier 14 in sequence, the c pole of the transistor 28 is connected to the negative pole of the relay 30 coil, the positive pole of the relay 30 coil is connected to the independent power supply +12 of the relay 30, the 0V end of the independent power supply of the relay 30 is connected to the third pin 18, and the relay 30 coil is connected in parallel with the second capacitor 25; the two endpoints of the normally open contact of the relay 30 are respectively connected to the negative pole of the PLC and the input end of the PLC.

[0018] During production on the glove production line, the test resistance of the detection module 11 is set to 2 MΩ based on the product voltage setting. Simultaneously, a salt substance that enhances water conductivity is added to the conductive liquid tank 7, with a salt concentration of 1%. As the stainless steel mold 3, fitted with the latex glove 4, prepares to enter the conductive liquid tank 7, the conductive liquid tank 7 is raised, completely immersing the latex glove 4 to be tested in the salt water. The stainless steel mold 3, fitted with the latex glove 4, then moves until it contacts the positive test electrode 5, which is fixed to the frame 6 of the conductive liquid tank 7. The detection module 11, the conductive liquid tank 7, the conductive liquid, and the positive test electrode 5 form a closed-loop circuit. The detection module 11 then emits a signal. If the detected resistance value is greater than the set value of 2 MΩ, the latex glove is deemed authentic; otherwise, it is rejected. A signal wheel 2 corresponds to each stainless steel glove mold 3. When the distance between the positive test electrode 5 and the stainless steel glove mold 2 exceeds 10 mm, a proximity switch and the signal wheel generate a signal. Each time a stainless steel glove mold 2 is moved, the proximity switch 1 outputs a position signal to the PLC controller 12 through the rotation of the signal wheel 2. The signal detected by the detection module 11 is transmitted to the PLC controller 12, and the position signal of the proximity switch 1 is also transmitted to the PLC controller 12. The PLC controller 12 performs arithmetic shift processing. When the stainless steel glove model 3, which has detected a positive rejection signal, runs to the positive rejection separation device 9, the PLC controller 12 sends a positive rejection signal to the solenoid valve 10. The solenoid valve 10 drives the positive rejection separation device 9 to separate the positive and rejection products. The touch screen 13 displays the entire detection and rejection separation process, with positive products indicated in green and rejection products indicated in red.

[0019] In this example, the operational amplifier is the µA741, the relay model is JZC-21F, the transistor model is 3DA128, the diode model is IN4007, the first resistor has a resistance of 1 / 2W, 2K, the second resistor has a resistance of 1 / 2W, 2M, the third resistor has a resistance of 1 / 2W, 2K, and the fourth resistor has a resistance of 1 / 2W, 3.5K. The first capacitor is 0.01µF / 63V, the second capacitor is 50µF / 25V, the potentiometer has a resistance of 1 / 2W, 2M, and the ammeter has a resistance of 5mA.

Claims

1. An online pinhole detection device for latex gloves, characterized in that: The device comprises a conductive liquid tank filled with conductive liquid, a positive detection electrode mounted on a frame fixed to the conductive liquid tank, the positive detection electrode in contact with a stainless steel glove mold covered with latex gloves on a latex glove production line, an output end of a detection module connected to the positive detection electrode, an input end of the detection module connected to a conductive liquid tank housing, the conductive liquid tank housing connected to a grounded detection electrode, the positive detection electrode, the conductive liquid, the conductive liquid tank, and the detection module forming a loop, a control end of the detection module connected to a PLC controller, and the PLC controller connected to a touch screen; The detection module includes an operational amplifier, wherein the seventh pin of the operational amplifier is connected to a +12V power supply, the fourth pin is connected to a -12V power supply and is connected to a conductive liquid tank housing, the second pin of the operational amplifier, a first resistor, a stainless steel glove model, a potentiometer, a second resistor, and a +12V power supply are connected in sequence, the second pin and the seventh pin of the operational amplifier are connected in parallel to a first capacitor, and the third pin is connected to a common-phase 12V power supply, the sixth pin of the operational amplifier is connected in series with the third resistor, and then connected in sequence to the fourth resistor and the third pin of the operational amplifier, and is also connected in sequence to an ammeter and a transistor b pole, the transistor e pole, the diode positive pole and the third pin of the operational amplifier are connected in sequence, the transistor c pole is connected to the negative pole of the relay coil, the relay coil positive pole is connected to a relay independent power supply +12, the relay independent power supply 0V end is connected to the third pin of the operational amplifier, and the relay coil is connected in parallel to the second capacitor; and the two endpoints of the relay normally open contact are respectively connected to the negative pole of a PLC and a PLC input end.

2. The latex glove pinhole online detection device according to claim 1, characterized in that: The detection voltage of the detection module is 100-1000V.

3. The online pinhole detection device for latex gloves according to claim 1, characterized in that: The conductive liquid is salt water with a concentration of 1%-3%.

4. The on-line pinhole detection device for latex gloves according to claim 1, characterized in that: The operational amplifier is µA741, the relay model is JZC-21F, the transistor model is 3DA128, and the diode model is IN4007.

5. The on-line pinhole detection device for latex gloves according to claim 1, characterized in that: The resistance of the first resistor is 1 / 2W, 2K, the resistance of the second resistor is 1 / 2W, 2M, the resistance of the third resistor is 1 / 2W, 2K, the resistance of the fourth resistor is 1 / 2W, 3.5K, the first capacitor is 0.01µF / 63V, the second capacitor is 50µF / 25V, the potentiometer is 1 / 2W, 2M, and the ammeter is 5mA.

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