Reflection-type photoelectric switch with adjustable output characteristics

Abstract

The invention provides a reflective optoelectronic switch with adjustable output characteristics. The reflective optoelectronic switch comprises a circuit module, a shell and a lens support. The circuit module is installed on the inner side of the lens support, a light sheet is installed at the position, corresponding to an emitting device on the circuit module, of the outer side of the lens support, the edge of an opening of the shell is connected with the edge of the lens support, an adjusting circuit board is further installed on one side of the shell, a knob is installed on the adjusting circuit board, and the outer side of the adjusting circuit board is covered with a lampshade. The knob is arranged in a through hole machined in the sealing ring, and a connecting cable is installed on one side of the shell and connected with the circuit module. The detection distance and the output form of the photoelectric switch can be adjusted through the adjusting circuit board, the use range of the photoelectric switch is widened, and the problems of single distance and single output mode of the photoelectric switch are solved.

Description

Technical Field

[0001] The invention relates to a reflective photoelectric switch with adjustable output characteristics. Background Art

[0002] Reflective photoelectric switch is also called photoelectric sensor or contactless position switch. It is a position switch that can be operated without mechanical contact with moving parts. Any object that can reflect light can be detected. The detection object passes through the reflective photoelectric switch, reflecting a sufficient amount of light emitted by the transmitter to the receiver. The photoelectric switch generates a switch signal, which converts the movement information and existence information of the detected object into an electrical signal, thereby realizing signal transmission and control. It has the advantages of small size, high precision, fast response speed, long detection distance and high reliability.

[0003] Since the detection distance of the reflective photoelectric switch is affected by the surface reflectivity of the detection object, the actual measurement distance must be adjusted according to the measurement sample and the sample spacing during installation to reduce the measurement error. If necessary, the switch housing must be opened to adjust the switch sensitivity, which is relatively cumbersome. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a reflective photoelectric switch with adjustable output characteristics.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a reflective photoelectric switch with adjustable output characteristics, comprising a circuit module, a housing, and a lens bracket; the circuit module is installed on the inner side of the lens bracket, an optical sheet is installed on the outer side of the lens bracket at a position corresponding to a transmitting device on the circuit module, an opening edge of the housing is connected to an edge of the lens bracket, an adjustment circuit board is also installed on one side of the housing, a knob is installed on the adjustment circuit board, a lampshade is covered on the outer side of the adjustment circuit board, the knob is arranged in a through hole processed by a sealing ring, and a connecting cable is installed on one side of the housing to connect with the circuit module.

[0007] A speaker hole is processed in the middle of the lens bracket, a supporting foot is arranged on the speaker hole, a light-transmitting hole cocentric with the speaker hole is processed in the center of the supporting foot, the circuit module is fixed on the supporting foot and the emitting device is placed in the light-transmitting hole.

[0008] A cylinder is provided on the top of the supporting foot, and the cylinder passes through a circular hole processed on the circuit module and is fixed by hot riveting.

[0009] The housing and the lens bracket are connected via a slot structure.

[0010] The 1 is provided with a transceiver circuit, a voltage stabilizing circuit, a port protection circuit, an output circuit and a chip U2, and the 9 is provided with an output characteristic adjustment circuit and an indicator light circuit;

[0011] The optical transceiver circuit includes a transmitting tube FS1, a receiving tube JS1, a resistor R8, and a triode Q2. One end of the resistor R8 is connected to the diode D1, and the other end is connected to the collector of the triode Q2; the base of the triode Q2 is connected to the 10th pin of the chip U2, the collector is connected to the resistor R8, and the emitter is connected to the transmitting tube FS1; one end of the transmitting tube FS1 is connected to the emitter of the triode Q2, and the other end is grounded; one end of the receiving tube JS1 is connected to the 15th pin of the chip U2, and the other end is grounded;

[0012] The output characteristic adjustment circuit comprises a potentiometer P1, a potentiometer P2, a resistor R6 and a resistor R7; one end of the potentiometer P1 is connected to the capacitor C4 and the 3rd pin of the chip U1, and the other two ends are connected to the resistor R4 and the resistor R5 respectively; one end of the resistor R4 is connected to the diode D1, and the other end is connected to the potentiometer P1; one end of the resistor R5 is connected to the potentiometer P1, and the other end is grounded;

[0013] The voltage stabilizing circuit includes a three-terminal voltage stabilizer U1 and a first resistor R1; one end of the resistor R1 is connected to the power output port, and the other end is connected to the three-terminal voltage stabilizer U1; one end of the three-terminal voltage stabilizer U1 is grounded, and the other two ends are connected to the resistor R1 and the diode D1 respectively;

[0014] The port protection circuit includes a diode D1, a diode D2, and a diode D3; one end of the diode D1 is connected to the power input port, and the other end is connected to the diode D2, forming a reverse polarity protection circuit; one end of the diode D2 is connected to the diode D1, and the other end is connected to the first resistor R1; one end of the diode D3 is connected to the diode D1, and the other end is connected to the output port, together forming a transient voltage protection circuit;

[0015] The indicator light circuit includes a light emitting diode LED1, a light emitting diode LED2, a resistor R6, and a resistor R7; one end of the LED1 is connected to the diode D1, and the other end is connected to the sixth resistor R6; one end of the resistor R6 is connected to the light emitting diode LED1, and the other end is connected to the 8th pin of the chip U2; one end of the resistor R7 is connected to the 6th pin of the chip U2, and the other end is connected to the light emitting diode LED2; one end of the light emitting diode LED2 is connected to the resistor R7, and the other end is grounded;

[0016] The output circuit includes a transistor Q1, a resistor R2, and a resistor R3; the collector of the transistor Q1 is connected to the output port, the emitter is connected to the resistor R2, and the base is connected to pin 7 of the chip U2 and the resistor R3; one end of the resistor R2 is connected to the diode D1, and the other end is connected to the emitter of the transistor Q1; one end of the resistor R3 is connected to the diode D1, and the other end is connected to the base of the transistor Q1.

[0017] The light sheet is a Fresnel lens.

[0018] The knob is also provided with a sealing ring.

[0019] The beneficial effects of the present invention are as follows: the detection distance and output form of the photoelectric switch can be adjusted by adjusting the circuit board, thereby increasing the application range of the photoelectric switch and changing the problem of the single distance and single output mode of the photoelectric switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a schematic diagram of the working principle of the present invention;

[0022] Figure 3 It is a schematic diagram of the circuit principle of the present invention.

[0023] In the figure: 1-circuit module, 2-housing, 3-lens bracket, 31-support foot, 32-speaker hole, 4-light sheet, 5-lamp cover, 6-knob, 7-sealing ring, 8-connecting cable, 9-adjusting circuit board. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the above. Figure 1-Figure 3 As shown, the invention provides a sealed reflective photoelectric switch with adjustable output characteristics, comprising a circuit module, a housing, a lens bracket, an optical sheet, a lampshade, a knob, a sealing ring, and an insulating cable. The circuit module is mounted on the lens bracket and fixed by heat riveting; the sealing ring is put on the knob and installed in the lampshade, and the lampshade and the lens bracket are fixed by a slot structure, and the light of the indicator light can pass through the lampshade to the outside of the housing; the insulating cable enters the housing from the outside and is connected to the circuit module; the housing and the optical sheet are respectively mounted on the lens bracket by a snap structure, and finally sealed by one-time pressing of glue by the final assembly packaging mold.

[0025] Furthermore, the circuit module is composed of an optical transceiver circuit, an output characteristic adjustment circuit, a voltage stabilization circuit, a port protection circuit, an indicator light circuit, an output circuit and a dedicated integrated chip for a photoelectric switch;

[0026] The 1 is provided with a transceiver circuit, a voltage stabilizing circuit, a port protection circuit, an output circuit and a chip U2, and the 9 is provided with an output characteristic adjustment circuit and an indicator light circuit;

[0027] The optical transceiver circuit includes a transmitting tube FS1, a receiving tube JS1, a resistor R8, and a triode Q2. One end of the resistor R8 is connected to the diode D1, and the other end is connected to the collector of the triode Q2; the base of the triode Q2 is connected to the 10th pin of the chip U2, the collector is connected to the resistor R8, and the emitter is connected to the transmitting tube FS1; one end of the transmitting tube FS1 is connected to the emitter of the triode Q2, and the other end is grounded; one end of the receiving tube JS1 is connected to the 15th pin of the chip U2, and the other end is grounded;

[0028] The output characteristic adjustment circuit comprises a potentiometer P1, a potentiometer P2, a resistor R6 and a resistor R7; one end of the potentiometer P1 is connected to the capacitor C4 and the 3rd pin of the chip U1, and the other two ends are connected to the resistor R4 and the resistor R5 respectively; one end of the resistor R4 is connected to the diode D1, and the other end is connected to the potentiometer P1; one end of the resistor R5 is connected to the potentiometer P1, and the other end is grounded;

[0029] The voltage stabilizing circuit includes a three-terminal voltage stabilizer U1 and a first resistor R1; one end of the resistor R1 is connected to the power output port, and the other end is connected to the three-terminal voltage stabilizer U1; one end of the three-terminal voltage stabilizer U1 is grounded, and the other two ends are connected to the resistor R1 and the diode D1 respectively;

[0030] The port protection circuit includes a diode D1, a diode D2, and a diode D3; one end of the diode D1 is connected to the power input port, and the other end is connected to the diode D2, forming a reverse polarity protection circuit; one end of the diode D2 is connected to the diode D1, and the other end is connected to the first resistor R1; one end of the diode D3 is connected to the diode D1, and the other end is connected to the output port, together forming a transient voltage protection circuit;

[0031] The indicator light circuit includes a light emitting diode LED1, a light emitting diode LED2, a resistor R6, and a resistor R7; one end of the LED1 is connected to the diode D1, and the other end is connected to the sixth resistor R6; one end of the resistor R6 is connected to the light emitting diode LED1, and the other end is connected to the 8th pin of the chip U2; one end of the resistor R7 is connected to the 6th pin of the chip U2, and the other end is connected to the light emitting diode LED2; one end of the light emitting diode LED2 is connected to the resistor R7, and the other end is grounded;

[0032] The output circuit includes a transistor Q1, a resistor R2, and a resistor R3; the collector of the transistor Q1 is connected to the output port, the emitter is connected to the resistor R2, and the base is connected to pin 7 of the chip U2 and the resistor R3; one end of the resistor R2 is connected to the diode D1, and the other end is connected to the emitter of the transistor Q1; one end of the resistor R3 is connected to the diode D1, and the other end is connected to the base of the transistor Q1.

[0033] Furthermore, the shell is installed and fixed with the lens bracket and the lampshade through a buckle and a slot structure, and the shell material is black PBT plastic.

[0034] Furthermore, the protruding small cylinder on the lens bracket passes through the circuit module and is fixed by hot riveting. The lens bracket material is black PBT plastic.

[0035] Furthermore, the optical sheet is fixed to the lens bracket through a buckle structure, and the optical sheet is a Fresnel lens, which is a kind of condenser and can focus light. The optical sheet material is black light-transmitting polymethyl methacrylate plastic.

[0036] Furthermore, the lampshade is used to mount two knobs and can transmit the light of the first light emitting diode LED1 and the second light emitting diode LED2 in the indicator light circuit. The material of the lampshade is black translucent polycarbonate plastic.

[0037] Furthermore, the knob has two knobs to control the first potentiometer P1 and the second potentiometer P2 respectively. The first potentiometer P1 can adjust the switch sensitivity, that is, adjust the switch sensing distance; the second potentiometer can adjust the switch output mode, that is, normally open / normally closed. The knob material is milky white polyoxymethylene plastic.

[0038] Furthermore, the sealing ring has two sealing rings, which are O-rings, which are respectively put on the two knobs for sealing, and the sealing ring material is rubber plastic.

[0039] Furthermore, the insulated cable is a brown, black and blue three-core special transmission cable, which is mainly used for switch power supply and output signal.

[0040] In the present invention, the output characteristics of the photoelectric switch are controlled by installing a knob on the housing, so that the detection distance and output form of the photoelectric switch can be adjusted after the photoelectric switch is sealed and packaged. A dedicated photoelectric switch integrated chip is used, and the chip integrates a sensitivity adjustable function unit and an output mode (normally open / normally closed) adjustable function unit. The sensitivity adjustable function unit defines a range value through the chip pin 3 and is directly connected to the potentiometer. When the potentiometer is adjusted to input different resistance values, it is converted into the chip built-in photoelectric amplifier gain through logical relationship processing, which affects the sensitivity of the switch, and the change of the switch sensitivity will cause the change of the detection distance. The greater the gain of the photoelectric amplifier within the defined range, the higher the switch sensitivity and the greater the detection distance; the output mode (normally open / normally closed) adjustable function unit is defined through the chip pin 9 and is directly connected to the potentiometer. The high and low level conversion formed by adjusting the potentiometer corresponds to the conversion of the normally open and normally closed modes of the photoelectric switch. Through the implementation of the present invention, on the one hand, the actual detection distance of the switch can be adjusted by installing the knob on the switch housing during use, and the detection distance can also be changed as required after installation. On the other hand, the normally open and normally closed signals of the switch can be selected according to the required signals, making the photoelectric switch easy to use and increasing the scope of use of the photoelectric switch, changing the single distance and single output mode of the photoelectric switch. At the same time, the circuit module adopts a domestic photoelectric switch dedicated integrated chip for circuit design, which can meet the miniaturization, integration and reliability requirements of the photoelectric switch. The switch housing parts are molded by mold injection molding, and finally the shell is integrated with injection molding and glue packaging, and no glue filling treatment is required inside. The waterproofness and lightweight index of the switch are greatly improved.

Claims

1. A reflective photoelectric switch with adjustable output characteristics, comprising a circuit module (1), a housing (2), and a lens bracket (3), characterized in that: The circuit module (1) is mounted on the inner side of a lens bracket (3); an optical sheet (4) is mounted on the outer side of the lens bracket (3) at a position corresponding to the emitting device on the circuit module (1); the opening edge of the housing (2) is connected to the edge of the lens bracket (3); an adjusting circuit board (9) is also mounted on one side of the housing (2); a knob (6) is mounted on the adjusting circuit board (9); a lampshade (5) is covered on the outer side of the adjusting circuit board (9); the knob (6) is arranged in a through hole processed by a sealing ring (7); and a connecting cable (8) is mounted on one side of the housing (2) to connect to the circuit module (1).

2. The reflective photoelectric switch with adjustable output characteristics as claimed in claim 1, characterized in that: A speaker hole (32) is machined in the middle of the lens bracket (3), a support foot (31) is provided on the speaker hole (32), a light-transmitting hole co-centric with the speaker hole (32) is machined in the center of the support foot (31), the circuit module (1) is fixed on the support foot (31) and the emitting device is placed in the light-transmitting hole.

3. The reflective photoelectric switch with adjustable output characteristics as claimed in claim 2, characterized in that: A cylinder is provided on the top of the supporting foot (31), and the cylinder passes through a circular hole processed on the circuit module (1) and is fixed by hot riveting.

4. The reflective photoelectric switch with adjustable output characteristics as claimed in claim 1, characterized in that: The housing (2) and the lens bracket (3) are connected via a slot structure.

5. The reflective photoelectric switch with adjustable output characteristics as claimed in claim 1, characterized in that: The 1 is provided with a transceiver circuit, a voltage stabilizing circuit, a port protection circuit, an output circuit and a chip U2, and the 9 is provided with an output characteristic adjustment circuit and an indicator light circuit; The optical transceiver circuit includes a transmitting tube FS1, a receiving tube JS1, a resistor R8, and a triode Q2. One end of the resistor R8 is connected to the diode D1, and the other end is connected to the collector of the triode Q2; the base of the triode Q2 is connected to the 10th pin of the chip U2, the collector is connected to the resistor R8, and the emitter is connected to the transmitting tube FS1; one end of the transmitting tube FS1 is connected to the emitter of the triode Q2, and the other end is grounded; one end of the receiving tube JS1 is connected to the 15th pin of the chip U2, and the other end is grounded; The output characteristic adjustment circuit comprises a potentiometer P1, a potentiometer P2, a resistor R6 and a resistor R7; one end of the potentiometer P1 is connected to the capacitor C4 and the 3rd pin of the chip U1, and the other two ends are connected to the resistor R4 and the resistor R5 respectively; one end of the resistor R4 is connected to the diode D1, and the other end is connected to the potentiometer P1; one end of the resistor R5 is connected to the potentiometer P1, and the other end is grounded; The voltage stabilizing circuit includes a three-terminal voltage stabilizer U1 and a first resistor R1; one end of the resistor R1 is connected to the power output port, and the other end is connected to the three-terminal voltage stabilizer U1; one end of the three-terminal voltage stabilizer U1 is grounded, and the other two ends are connected to the resistor R1 and the diode D1 respectively; The port protection circuit includes a diode D1, a diode D2, and a diode D3; one end of the diode D1 is connected to the power input port, and the other end is connected to the diode D2, forming a reverse polarity protection circuit; one end of the diode D2 is connected to the diode D1, and the other end is connected to the first resistor R1; one end of the diode D3 is connected to the diode D1, and the other end is connected to the output port, together forming a transient voltage protection circuit; The indicator light circuit includes a light emitting diode LED1, a light emitting diode LED2, a resistor R6, and a resistor R7; one end of the LED1 is connected to the diode D1, and the other end is connected to the sixth resistor R6; one end of the resistor R6 is connected to the light emitting diode LED1, and the other end is connected to the 8th pin of the chip U2; one end of the resistor R7 is connected to the 6th pin of the chip U2, and the other end is connected to the light emitting diode LED2; one end of the light emitting diode LED2 is connected to the resistor R7, and the other end is grounded; The output circuit includes a transistor Q1, a resistor R2, and a resistor R3; the collector of the transistor Q1 is connected to the output port, the emitter is connected to the resistor R2, and the base is connected to pin 7 of the chip U2 and the resistor R3; one end of the resistor R2 is connected to the diode D1, and the other end is connected to the emitter of the transistor Q1; one end of the resistor R3 is connected to the diode D1, and the other end is connected to the base of the transistor Q1.

6. The reflective photoelectric switch with adjustable output characteristics as claimed in claim 1, characterized in that: The optical sheet (4) is a Fresnel lens.

7. The reflective photoelectric switch with adjustable output characteristics as claimed in claim 1, characterized in that: The knob (6) is also covered with a sealing ring (7).

Images