CN217276239U - Background suppression type photoelectric sensor convenient to adjust - Google Patents

Abstract

The utility model relates to a convenient background suppression type photoelectric sensor who adjusts, including shell, installation mirror holder and PCB board to the shell in and inlay integrative lens and the back lid of locating the shell both sides respectively, all through buckle looks joint between mirror holder and shell, mirror holder and PCB inter-plate, the PCB board includes power supply circuit, microcontroller, TOF range finding chip, adjustable potentiometre, high/low side switch and output indicator, the adjust knob with adjustable potentiometre input end looks adaptation is installed to the lateral wall of shell one side. The utility model discloses simple structure, adjust knob's turned angle is linear relation with setting for threshold distance, compares in the mainstream scheme, and this technical scheme is adjusted and is set for threshold distance more directly perceived facility, and blind area and black and white error can not increase along with the increase of setting for threshold distance, has reduced the black and white error and the blind area of sensor.

Description

Background suppression type photoelectric sensor convenient to adjust

Technical Field

The utility model relates to a sensor technology field especially relates to a background suppression type photoelectric sensor of convenient regulation.

Background

Background suppression type photoelectric sensor has now widely been applied to trades such as automation, commodity circulation owing to its advantages such as strong, the detection precision height of reliability. When the background suppression type photoelectric sensor detects an object, the sensor outputs the object within a set distance; the sensor does not output when the object is outside the set distance. The detection capability of the sensor to the detection objects with different reflectivity is basically consistent. The mainstream design scheme in the market is generally realized based on a trigonometry method, the receiver in the sensor is divided into a far-end region and a near-end region, and the ratio of the light sensitive areas of the two receiving parts in the sensor is changed by adjusting an optical lens through mechanical traction. When the sensor is too close to the detection object, the near end part of the receiving part cannot receive effective signals, so that a large blind area is formed; when the sensor detects a low-reflectivity object at a far distance, effective signals received by the far-end area and the near-end area of the receiving part are weak, so that effective compared signals are difficult to form, and black and white errors are further formed. In addition, the blind area and the black-and-white detection error of the background suppression type photoelectric sensor designed based on the trigonometry principle are increased along with the increase of the set threshold distance, so that the measuring range of the common background suppression type photoelectric sensor is mostly within 500 mm. Meanwhile, the number of turns of the knob is not in a linear relationship with the set distance, so that the adjustment needs to be approached repeatedly when the set threshold distance is adjusted, and the adjustment process is complicated.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome exist among the prior art not enough, provide a background suppression type photoelectric sensor who conveniently adjusts.

The utility model discloses a realize through following technical scheme:

the utility model provides a convenient background suppression type photoelectric sensor who adjusts, includes the shell, installs mirror holder and PCB board to the shell in and inlays integrative lens and the hou gai of locating the shell both sides respectively, its characterized in that, between mirror holder and the shell, all through buckle looks joint between mirror holder and the PCB board, the PCB board includes power supply circuit, microcontroller, TOF range finding chip, adjustable potentiometer, high/low side switch and output indicator, the adjust knob with adjustable potentiometer input looks adaptation is installed to the lateral wall of shell one side, and TOF range finding chip's input and output, the sliding end of adjustable potentiometer, high/low side switch's input, output indicator's input all are connected electrically to microcontroller.

Preferably, the middle part of the mirror holder is provided with a limiting convex edge, and the inner wall of the shell is provided with a limiting groove matched with the limiting convex edge.

Preferably, the integral lens is welded to the housing.

Preferably, an encapsulation is arranged between the periphery of the rear cover and the shell.

Preferably, the adjustable potentiometer is a single-turn adjustable potentiometer.

Preferably, the back lid injection moulding has the leaded light post, leaded light post the inner just to the output pilot lamp, and leaded light post outer end is located the back lid lateral surface.

The utility model has the advantages that:

the utility model discloses simple structure, the turned angle of adjust knob and set for threshold distance are the linear relation, compare with mainstream scheme, this technical scheme adjusts and sets for threshold distance more directly perceived convenient, and blind area and black and white error can not increase along with the increase of setting for threshold distance, have reduced sensor's black and white error and blind area; the adjusting knob is compatible with the adjusting form of the mainstream in the market, and the adjusting precision and convenience are improved; the relative stability of the spectacle frame and the shell is further improved by the limiting convex ribs and the limiting grooves; the integrated lens has the functions of an optical lens and a protection function; the encapsulation can enable the sensor to reach the protection level of IP 67; the single-ring adjustable potentiometer can simplify the adjustment process; the light guide column is convenient for workers to observe the current working condition of the sensor.

Drawings

Fig. 1 is a schematic diagram of the explosion structure of the present invention.

Fig. 2 is a schematic diagram of module connection of a PCB board.

In the figure: 1. a unitary lens; 2. a housing; 3. adjusting a knob; 4. a frame; 5. an adjustable potentiometer; 6. a PCB board; 7. a rear cover; 8. a light guide pillar.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in the figure, the utility model comprises a shell 2, a lens frame 4 and a PCB 6 which are arranged in the shell 2, and an integrated lens 1 and a rear cover 7 which are respectively embedded on two sides of the shell 2, and is characterized in that the lens frame 4 and the shell 2, and the lens frame 4 and the PCB 6 are clamped by buckles, so that the shell 2, the integrated lens 1, the lens frame 4 and the PCB 6 are relatively fixed to form an optical system, the PCB 6 comprises a power circuit, a microcontroller, a TOF ranging chip, an adjustable potentiometer 5, a high/low side switch and an output indicator light, external power is reduced by the power circuit and then provides power supply voltage for the microcontroller and the TOF ranging chip, and provides reference voltage for the adjustable potentiometer, the TOF ranging chip is electrically connected with a transmitting component and a receiving component of light, the input end and the output end of the TOF ranging chip perform data interaction with the microcontroller through an IIC bus, an adjusting knob 3 matched with the input end of an adjustable potentiometer 5 is installed on the side wall of one side of the shell 2, the adjusting knob 3 is coupled to the adjustable potentiometer 5, two fixed ends of the adjustable potentiometer 5 are respectively and electrically connected to the anode and the cathode of the output end of the power circuit, the sliding end of the adjustable potentiometer 5 is electrically connected to an AD sampling port of the microcontroller, the microcontroller samples the voltage of the point and converts the voltage into a set threshold distance through a calibration formula, and because the adjusting angle and the resistance value of the adjustable potentiometer 5 are in a linear relation, the sliding end voltage and the sliding end resistance value of the adjustable potentiometer 5 are in a linear relation, the rotating angle of the adjusting knob 3 and the set threshold distance are in a linear relation, compared with the mainstream scheme, the technical scheme is more visual and convenient in adjustment of the set threshold distance, and the input ends of the high/low side switch and the output indicator lamp are both electrically connected to the microcontroller, the microcontroller compares the measured distance of the TOF ranging chip with a set threshold distance, and when the measured distance is smaller than the set threshold distance, the microcontroller drives the high/low-side switch to output external PNP/NPN and simultaneously drives the output indicator lamp to output indication; when the measured distance is greater than the set threshold distance, the microcontroller does not carry out output drive, so that the function of background suppression is realized, the sensor judges and outputs after calculating the time of light flight, the blind area and the black-white error cannot increase along with the increase of the set threshold distance, even at a 1000mm background, the detection effect that the object detection blind area with the reflectivity of 1 percent is less than 5mm and the black-white error is less than 5 percent can be achieved, the black-white error and the blind area of the sensor are greatly reduced, correspondingly, the mechanical adjustment of a triangular method is replaced by the electrically adjustable adjusting knob 3, the adjusting mode of the mainstream in the market is compatible, and the adjusting precision and the convenience are improved.

The middle part of the mirror holder 4 is provided with a limit bead, the inner wall of the shell 2 is provided with a limit groove matched with the limit bead, and the relative stability of the mirror holder 4 and the shell 2 is further improved.

The integrated lens 1 is welded with the shell 2, so that the function of an optical lens is achieved, and the protection function is achieved.

And an encapsulation is arranged between the periphery of the rear cover 7 and the shell 2, so that the protection level of the sensor can reach IP 67.

The adjustable potentiometer 5 is a single-turn adjustable potentiometer and is used for adjustment, the adjustable range of the adjusting knob 3 is smaller than 360 degrees, compared with the traditional technical scheme that a multi-turn knob needs to be rotated when setting a background, the technical scheme can simplify the adjusting process.

Rear cover 7 injection moulding has leaded light post 8, leaded light post 8 the inner is just to output pilot lamp, and 8 outer ends of leaded light post are located rear cover 7 lateral surfaces, and the staff of being convenient for observes the current behavior of sensor.

The utility model discloses an operating principle is, microcontroller control emission subassembly sends a light and begins the timing, when there being the detection object in the sensor range, light flies to the detection object on the back just can reflect and fly back, the time that stops after receiving light by the receiving module, light from transmitting to reflecting to receive the time record of light flight time t, alright calculate the distance s that detects the object apart from the sensor from this, s =1/2 c t (c is the light speed). The utility model discloses simple structure, the turned angle of adjust knob and settlement threshold distance are the linear relation, compare with mainstream scheme, this technical scheme adjusts settlement threshold distance more directly perceived convenience, and blind area and black and white error can not increase along with the increase of settlement threshold distance, has reduced sensor's black and white error and blind area; the adjusting knob is compatible with the adjusting form of the mainstream in the market, and the adjusting precision and convenience are improved; the relative stability of the spectacle frame and the shell is further improved by the limiting convex edges and the limiting grooves; the integrated lens has the functions of an optical lens and a protection function; the encapsulation can enable the sensor to reach the protection level of IP 67; the single-turn adjustable potentiometer can simplify the adjustment process; the light guide column is convenient for workers to observe the current working condition of the sensor.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. The utility model provides a convenient background suppression type photoelectric sensor who adjusts, includes the shell, installs mirror holder and PCB board to the shell in and inlays integrative lens and the hou gai of locating the shell both sides respectively, its characterized in that, between mirror holder and shell, all through buckle looks joint between mirror holder and the PCB board, the PCB board includes power supply circuit, microcontroller, TOF range finding chip, adjustable potentiometer, high/low side switch and output indicator, the adjust knob with adjustable potentiometer input end looks adaptation is installed to the lateral wall of shell one side, and TOF range finding chip's input and output, adjustable potentiometer's sliding end, high/low side switch's input, output indicator's input all are connected electrically to microcontroller.

2. A background suppression type photoelectric sensor convenient for adjustment according to claim 1, wherein the middle of the frame is provided with a limiting rib, and the inner wall of the housing is provided with a limiting groove matched with the limiting rib.

3. An adjustable background rejection photosensor according to claim 1 wherein said unitary lens is welded to the housing.

4. A background suppression type photoelectric sensor convenient to adjust as claimed in claim 3, wherein an encapsulation is provided between the periphery of the back cover and the housing.

5. An adjustable background suppression type photoelectric sensor according to claim 1, wherein the adjustable potentiometer is a single turn adjustable potentiometer.

6. The background suppression type photoelectric sensor convenient to adjust as claimed in claim 1, wherein the back cover is injection molded with a light guide pillar, an inner end of the light guide pillar faces the output indicator light, and an outer end of the light guide pillar is located on an outer side surface of the back cover.

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