Full-roller contact type plate shape detection roller

Abstract

The invention discloses a full-roller contact type strip shape detection roller, and relates to the technical field of strip shape instruments. Compared with a traditional point type or line type detection scheme, a full-roller contact type detection mode is adopted, the whole width of the plate can be fully covered, and higher-precision deformation detection is achieved. Through the resistance value change of the force sensitive resistor and the capacitance change of the detection part, the system can sensitively sense tiny bulges on the surface of the plate, so that the detection accuracy is improved, the real-time monitoring on the deformation of the plate is ensured, and the production quality is improved; due to the fact that the roller body is installed on the machine frame in a rotating mode and cannot move in the radial direction, when protrusions appear on the surface of the plate, torque borne by the roller body is increased, the mechanical property guarantees the detection accuracy of the system, and meanwhile misjudgment caused by external vibration or environmental factors is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of plate shape meters, in particular to a full-roller contact type plate shape detection roller. Background Art

[0002] In current industrial production, in order to ensure the surface quality of the plate, it is necessary to detect its deformation. Traditional plate shape detection methods are mainly divided into contact and non-contact. Defects of non-contact detection methods: At present, some high-end production lines use laser or ultrasonic detection to replace mechanical contact detection. However, these methods also have many problems. Laser detection is easily affected by changes in the reflectivity of the plate surface, resulting in increased detection errors; ultrasonic detection has high requirements on the environment. Factors such as air humidity and temperature will affect the accuracy of detection, and the equipment cost is relatively high. Based on the above-mentioned defects of the prior art, the present invention proposes a full-roller contact plate shape detection roller, which improves the detection accuracy and stability through a full-roller contact structure, a force-sensitive resistor and a multiple detection method combining capacitance changes. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a full-roller contact plate shape detection roller, comprising a roller body, roller shafts are fixedly installed at both ends of the axial center position of the roller body, a plurality of cylindrical chambers are opened in a circular equidistant array at positions on the circumferential surface of the roller body, a central conductive column is arranged at the axial center of the cylindrical chamber, the side of the central conductive column away from the outer surface of the roller body is insulated and fixed to the inner wall of the cylindrical chamber by an insulating support body, an insulating coating is applied to the side of the cylindrical chamber away from the outer surface of the roller body, a conductive metal film is adhered to the surface of the insulating coating, and a detection part is formed between the conductive metal plate and the central conductive column.

[0004] Preferably, both ends of the cylindrical chamber are sealed and fixedly installed with rubber plugs.

[0005] Preferably, a fixed sleeve on the roller shaft is provided with a detection toggle ring, an outer rotating sleeve of the detection toggle ring is provided with a detection limiting cover, and an annular permanent magnet is fixedly mounted on the detection limiting cover.

[0006] Preferably, a cavity is provided between the detection limiting cover and the detection toggle ring, a plurality of toggle plates in a circular equidistant array are provided inside the cavity, and a limiting plate is provided on the side of each toggle plate.

[0007] Preferably, the toggle plate is fixedly matched with the detection toggle ring, the limiting plate is fixedly matched with the detection limiting cover, a force-sensitive resistor is provided in contact between the toggle plate and the limiting plate, and the force-sensitive resistor is adhered and fixed on the opposite surfaces of the toggle plate and the limiting plate.

[0008] Preferably, an electromagnet is further included. The electromagnet is magnetically coupled with the annular permanent magnet. The electromagnet is sleeved outside the annular permanent magnet, and the electromagnet is fixed on the frame of the supporting roller body.

[0009] Preferably, the detection unit, the diode, and the resistor R1 are connected in series in the intermittently powered DC power supply V1, where the central conductive column and the conductive metal film in the detection unit serve as the two poles of the detection unit.

[0010] Preferably, a resistor R3 is connected in parallel at both poles of the detection unit. The positive pole of the resistor R3 is connected to the base of the NPN transistor through the resistor R2, the negative pole of the resistor R3 is directly connected to the emitter of the NPN transistor, and the collector and emitter of the NPN transistor are connected in series with the indicator light in the DC power supply V2.

[0011] The present invention has the following beneficial effects compared with the prior art: (1) The present invention adopts a full-roller contact detection method. Compared with the traditional point or line detection scheme, it can comprehensively cover the entire width of the plate, achieving higher-precision deformation detection. Through the resistance change of the force-sensitive resistor and the capacitance change of the detection unit, the system can sensitively sense the tiny protrusions on the surface of the plate, thereby improving the detection accuracy, ensuring real-time monitoring of the plate deformation, and improving the production quality; (2) Since the roller body of the present invention is rotatably installed on the frame and cannot be displaced radially, when there are protrusions on the surface of the plate, the torque received by the roller body increases. This mechanical characteristic ensures the detection accuracy of the system and avoids misjudgment caused by external vibration or environmental factors; (3) The present invention adopts a detection method combining the force-sensitive resistor and capacitance change, avoiding the misjudgment problem that may be brought by a single sensor detection. When there are protrusions on the surface of the plate, not only the resistance value of the force-sensitive resistor changes, but also the capacitance value of the detection unit changes accordingly. The two work together to effectively improve the judgment accuracy of the system and reduce the wrong judgment caused by environmental interference or detection error. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the roller body of the present invention.

[0013] Figure 2 It is a schematic structural diagram at the electromagnet of the present invention.

[0014] Figure 3 For the present invention Figure 2 Schematic structural diagram at position A.

[0015] Figure 4 It is a schematic side view structural diagram of the roller body of the present invention.

[0016] Figure 5 For the present invention Figure 4 Schematic structural diagram at position B.

[0017] Figure 6This is a working principle diagram of the detection unit of the present invention.

[0018] In the figure: 101-roller body; 102-roller shaft; 103-limiting plate; 104-central conductive column; 105-insulating support body; 106-cylindrical chamber; 107-electromagnet; 108-annular permanent magnet; 109-rubber plug; 110-detection limiting cover; 111-detection toggle ring; 112-toggle plate; 113-force sensitive resistor. DETAILED DESCRIPTION

[0019] The following is combined with Figures 1-6 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0020] The present invention provides a full-roller contact type plate shape detection roller, comprising a roller body 101, roller shafts 102 are fixedly installed at both ends of the axis center of the roller body 101, a plurality of cylindrical chambers 106 are arranged in a circular equidistant array at positions on the circumferential surface of the roller body 101, a central conductive column 104 is arranged at the axis center of the cylindrical chamber 106, a side of the central conductive column 104 away from the outer surface of the roller body 101 is insulated and fixedly arranged with an insulating support body 105, an insulating coating is applied to the side of the cylindrical chamber 106 away from the outer surface of the roller body 101, a conductive metal sheet is pasted on the surface of the insulating coating, and a detection part is formed between the conductive metal sheet and the central conductive column 104. Rubber plugs 109 are fixedly installed at both ends of the cylindrical chamber 106 to seal. A detection toggle ring 111 is fixedly sleeved on the roller shaft 102, and a detection limiting cover 110 is rotatably sleeved on the outer side of the detection toggle ring 111, and an annular permanent magnet 108 is fixedly mounted on the detection limiting cover 110. A cavity is provided between the detection limiting cover 110 and the detection toggle ring 111, and a plurality of circular equidistant array toggle plates 112 are provided inside the cavity, and a limiting plate 103 is provided on the side of each toggle plate 112. The toggle plate 112 is fixedly matched with the detection toggle ring 111, and the limiting plate 103 is fixedly matched with the detection limiting cover 110. A force-sensitive resistor 113 is provided in contact between the toggle plate 112 and the limiting plate 103, and the force-sensitive resistor 113 is adhesively fixed to the opposite surfaces of the toggle plate 112 and the limiting plate 103. The electromagnet 107 is also included. The electromagnet 107 cooperates with the annular permanent magnet 108 in magnetic force. The electromagnet 107 is sleeved on the outer side of the annular permanent magnet 108 and is fixed on the frame supporting the roller body 101 .

[0021] The detection part, the diode and the resistor R1 are connected in series in the intermittently powered DC power supply V1, wherein the central conductive column 104 and the conductive metal sheet in the detection part serve as the two poles of the detection part. The two poles of the detection part are connected in parallel with the resistor R3, the positive electrode of the resistor R3 is connected to the base of the NPN transistor through the resistor R2, the negative electrode of the resistor R3 is directly connected to the emitter of the NPN transistor, and the collector and emitter of the NPN transistor are connected in series with the indicator light in the DC power supply V2.

[0022] The working principle of a full-roller contact plate shape detection roller disclosed in the present invention is as follows: when the plate contacts the roller body 101, it will be squeezed with the surface of the roller body 101, so there will be friction between the roller body 101 and the plate. Since the roller body 101 is rotatably installed on the frame and cannot be radially displaced, when a bulge appears on the surface of the plate, the roller body 101 will be further squeezed, which will cause the friction between the roller body 101 and the plate to increase. At this time, the friction exerted on the roller body 101 will increase. By intermittently starting the electromagnet 107 (the higher the frequency, the more intensive the detection of multiple locations on the surface of the plate), the magnetic force generated by the electromagnet 107 will magnetically constrain the annular permanent magnet 108, thereby limiting the rotation of the annular permanent magnet 108. Since the annular permanent magnet 108 is fixedly matched with the detection limiting cover 110, and the detection limiting cover 110 is fixedly matched with the limiting plate 103, the limiting plate 103 will be restricted from rotating. At this time, since the roller body 101, the roller shaft 102, the detection toggle ring 111, and the toggle plate 112 are fixed as a whole and rotate synchronously, the toggle plate 112 will squeeze the force-sensitive resistor 113. Because the squeezing force of the toggle plate 112 depends on the torque applied to the roller body 101, and the torque applied to the roller body 101 depends on the friction between the roller body 101 and the plate, the resistance value of the force-sensitive resistor 113 itself (when the electromagnet 107 is started) can be used to determine whether there is a protrusion on the surface of the plate.

[0023] Meanwhile, when the sheet material extrudes the surface of the roller body 101 (the protrusion extrudes the roller body 101), it will cause deformation on the surface of the roller body 101. At this time, the cylindrical chamber 106 will deform, which will cause the distance between the conductive metal film in the cylindrical chamber 106 and the central conductive column 104 to decrease, resulting in an increase in the capacitance value of the detection part. Under the default state, the DC power supply V1 will charge the detection part. Assuming the charging time is 0.1S and the starting time of the DC power supply V1 is also 0.1S, at this time, the detection part is just fully charged and the voltage of the detection part reaches the maximum value. Then, it supplies power to the base of the NPN transistor through the resistor R2, and the voltage can make the collector and emitter of the NPN transistor conduct, and at this time, the indicator light is on. When the roller body 101 is extruded, the capacitance value of the detection part increases. Since the charging time is still 0.1S, the detection part cannot be fully charged, which will cause the voltage across the detection part not to reach the maximum value. Therefore, the collector and emitter of the NPN transistor cannot conduct (the voltage distributed to the base is less than 0.7V), and at this time, the indicator light is in the off state. That is to say, when the indicator light is on 0.1S after the DC power supply V1 is powered on, it means that the sheet material has no convex deformation, otherwise, it means that the sheet material has deformation.

Claims

1. A full-roller contact type plate shape detection roller, characterized in that: The invention comprises a roller body (101), roller shafts (102) are fixedly mounted at both ends of the axis of the roller body (101), a plurality of cylindrical chambers (106) are arranged in a circular equidistant array at positions on the circumferential surface of the roller body (101), a central conductive column (104) is arranged at the axis of the cylindrical chamber (106), a side of the central conductive column (104) away from the outer surface of the roller body (101) is insulated and fixed to the inner wall of the cylindrical chamber (106) by an insulating support body (105), an insulating coating is applied to the side of the cylindrical chamber (106) away from the outer surface of the roller body (101), a conductive metal film is adhered to the surface of the insulating coating, and a detection unit is formed between the conductive metal plate and the central conductive column (104).

2. The full-roller contact type flatness detection roller according to claim 1, characterized in that: Both ends of the cylindrical chamber (106) are sealed and fixedly mounted with rubber plugs (109).

3. The full-roller contact type plate shape detection roller according to claim 2, characterized in that: A detection toggle ring (111) is fixedly sleeved on the roller shaft (102), a detection limit cover (110) is provided on the outer rotating sleeve of the detection toggle ring (111), and an annular permanent magnet (108) is fixedly mounted on the detection limit cover (110).

4. The full-roller contact type plate shape detection roller according to claim 3, characterized in that: A cavity is provided between the detection limiting cover (110) and the detection toggle ring (111), a plurality of toggle plates (112) in a circular equidistant array are provided inside the cavity, and a limiting plate (103) is provided on the side of each toggle plate (112).

5. The full-roller contact type plate shape detection roller according to claim 4, characterized in that: The toggle plate (112) is fixedly matched with the detection toggle ring (111), the limiting plate (103) is fixedly matched with the detection limiting cover (110), a force-sensitive resistor (113) is provided in contact between the toggle plate (112) and the limiting plate (103), and the force-sensitive resistor (113) is adhesively fixed to the opposite surfaces of the toggle plate (112) and the limiting plate (103).

6. The full-roller contact type flatness detection roller according to claim 5, characterized in that: It also includes an electromagnet (107), the electromagnet (107) and the annular permanent magnet (108) are magnetically matched, the electromagnet (107) is sleeved on the outside of the annular permanent magnet (108), and the electromagnet (107) is fixed on the frame supporting the roller body (101).

7. The full-roller contact type plate shape detection roller according to claim 6, characterized in that: The detection part, the diode and the resistor R1 are arranged in series in an intermittently energized DC power supply V1, wherein the central conductive column (104) and the conductive metal film in the detection part serve as the two poles of the detection part.

8. The full-roller contact type flatness detection roller according to claim 7, characterized in that: A resistor R3 is connected in parallel between the two poles of the detection part. The positive pole of the resistor R3 is connected to the base of the NPN transistor through the resistor R2, and the negative pole of the resistor R3 is directly connected to the emitter of the NPN transistor. The collector and emitter of the NPN transistor are connected in series with the indicator light in the DC power supply V2.

Images