High-speed light curtain sensor synchronization system

Abstract

The invention relates to the technical field of photoelectricity, in particular to a high-speed light curtain sensor synchronizing system which comprises a transmitting end, a receiving end and a microcontroller, and the transmitting end and the receiving end are jointly connected to the microcontroller. The transmitting end comprises an infrared transmitting tube, a transmitting control circuit and a synchronous circuit, the infrared transmitting tube is connected with the transmitting control circuit, the transmitting control circuit is connected with the synchronous circuit, and the synchronous circuit is connected with the microcontroller; the receiving end comprises a light receiving tube, a receiving control circuit and a receiving amplification circuit, the light receiving tube is respectively connected with the receiving control circuit and the receiving amplification circuit, and the receiving control circuit and the receiving amplification circuit are respectively connected with the microcontroller; and the microcontroller is connected with an output signal circuit. Compared with the prior art, the high-speed light curtain sensor synchronization system greatly improves the detection speed of the light curtain, and can effectively solve the problem that the detection speed of the light curtain sensor in the prior art is low.

Description

[Technical field]

[0001] The invention relates to the field of optoelectronic technology, and in particular to a high-speed light curtain sensor synchronization system. [Background technology]

[0002] Light curtain is a synchronous beam detection device with a row of infrared emitting tubes and light receiving tubes installed from top to bottom. Light curtain sensor devices are widely used in various occasions such as vehicle classification detection and weighing at highway toll stations, elevator door switch control, industrial production safety protection, and rebar production process in the metallurgical industry.

[0003] The light curtain consists of a transmitter, a receiver, and a dedicated synchronous cable connecting the transmitter and receiver. There is an infrared transmitter at a certain interval along the length direction of the transmitter, and the same number of light receiving tubes are arranged at the same interval along the length direction of the receiving end. When working, an infrared transmitter at the transmitter sends out a light pulse, and the light receiving tube at the corresponding position searches for the signal at the same time. After a period of time, the infrared transmitter and the corresponding light receiving tube are turned off to complete the scanning of one channel, and then the scanning of the next channel is carried out until all the infrared transmitters and light receiving tubes are scanned, forming a scanning cycle. After a scanning cycle, the system determines whether a channel is blocked, thereby realizing the detection of objects.

[0004] The dedicated synchronization cable connecting the transmitting and receiving ends of the light curtain is very important. Each infrared transmitting tube emits an instantaneous light signal within a certain time slice, and the corresponding light receiving tube must detect whether the light signal is received within the same time slice. If the time is misplaced, due to the scattering effect of light, the light signal emitted by the adjacent infrared transmitting tube will be received, resulting in wrong judgment.

[0005] The light curtain receiving end transmits the necessary clock signal and start signal to the transmitting end through the synchronization cable, so that the infrared transmitting tubes on the transmitting end can emit infrared light signals in a fixed order and time in turn, thus ensuring the stable operation of the light curtain.

[0006] The light curtain sensor device of the prior art has a microcontroller at the transmitting end and a microcontroller at the receiving end to perform control calculations respectively. There are problems of signal synchronization and delay between the two microcontrollers, and the detection speed is slow, which needs to be improved. [Summary of the invention]

[0007] In order to overcome the above problems, the present invention proposes a high-speed light curtain sensor synchronization system that can effectively solve the above problems.

[0008] A technical solution provided by the present invention to solve the above technical problems is: to provide a high-speed light curtain sensor synchronization system, including a transmitting end, a receiving end and a microcontroller, the transmitting end and the receiving end are commonly connected to the microcontroller; the transmitting end includes an infrared transmitting tube, a transmitting control circuit and a synchronization circuit, the infrared transmitting tube is connected to the transmitting control circuit, the transmitting control circuit is connected to the synchronization circuit, and the synchronization circuit is connected to the microcontroller; the receiving end includes an optical receiving tube, a receiving control circuit and a receiving amplifying circuit, the optical receiving tube is respectively connected to the receiving control circuit and the receiving amplifying circuit, the receiving control circuit and the receiving amplifying circuit are respectively connected to the microcontroller; the microcontroller is connected to an output signal circuit.

[0009] Preferably, the transmitting end and the receiving end are separated from each other and placed opposite to each other, both of which are tubular, coplanar and parallel; the transmitting end is used to transmit light signals, and the receiving end is used to detect light signals and transmit them to a microcontroller for processing.

[0010] Preferably, the microcontroller controls the infrared transmitting tubes to transmit infrared rays in turn through the transmitting control circuit, and controls the optical receiving tubes to receive infrared rays in turn through the receiving control circuit. The microcontroller detects the received light signal through the receiving amplification circuit, and determines whether there is an object blocking the transmitting end and the receiving end by judging the number of light signals.

[0011] Preferably, the transmitting end and the receiving end are connected to the microcontroller via synchronization cables respectively.

[0012] Preferably, the synchronous cable adopts a shielded cable, which includes a connector, a plastic sheath, a metal shielding wire and multiple wires, the metal shielding wire wraps the multiple wires, the plastic sheath wraps the metal shielding wire, and the connector is arranged at the end of the synchronous cable for connecting the transmitting end or the receiving end.

[0013] Preferably, the transmitting end includes a transmitting end housing, and a first end cap and a second end cap are respectively fixed at both ends of the transmitting end housing, and the first end cap and the second end cap are used to seal the two ends of the transmitting end housing; a filter is provided on one side of the transmitting end housing, and the filter is fixed on the light beam emitting side of the transmitting end housing.

[0014] Preferably, the infrared emitting tube is arranged on the inner side of the filter, and the infrared emitting tube includes a plurality of infrared emitting diodes arranged in a row. The infrared emitting diodes are located inside the transmitting end housing, and the light beam emitted by the infrared emitting diode is emitted outward through the filter; the number of the light receiving tubes is the same as the number of the infrared emitting diodes, and the light receiving tubes correspond to the infrared emitting diodes one by one.

[0015] Preferably, a transmitter circuit board is arranged in the transmitter housing, and the infrared emitting diode is connected to the transmitter circuit board; the transmitter housing is made of aluminum profile, and a mounting groove is arranged in the transmitter housing, and the transmitter circuit board is arranged in the mounting groove.

[0016] Preferably, the receiving end includes a receiving end circuit board, the receiving amplifying circuit is arranged on the receiving end circuit board, and the receiving amplifying circuit includes a signal amplifying chip.

[0017] Preferably, the high-speed light curtain sensor synchronization system further comprises a synchronization circuit board, the synchronization circuit is arranged on the synchronization circuit board, the synchronization circuit board is located in the transmitting end, and a synchronization signal chip is arranged on the synchronization circuit board.

[0018] Compared with the prior art, the high-speed light curtain sensor synchronization system of the present invention uses a microcontroller to simultaneously control the transmitting end and the receiving end. Therefore, there is no problem of signal synchronization and delay between the two microcontrollers. The time for transmitting a channel can be greatly shortened. After testing on an actual circuit board, this time is 10 microseconds, which is much faster than the 250 microseconds of the ordinary two microcontroller solution. The detection speed of the light curtain is greatly improved, and the problem of slow detection speed of the light curtain sensor in the prior art can be effectively solved.

Brief Description of the Drawings

[0019] Figure 1 It is a functional block diagram of the high-speed light curtain sensor synchronization system of the present invention;

[0020] Figure 2 It is a structural diagram of the high-speed light curtain sensor synchronization system of the present invention;

[0021] Figure 3 It is a structural diagram of the transmitting end of the high-speed light curtain sensor synchronization system of the present invention;

[0022] Figure 4 This is a structural diagram of the synchronization cable of the high-speed light curtain sensor synchronization system of the present invention. [Specific implementation method]

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0025] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] See also Figures 1 to 4 The high-speed light curtain sensor synchronization system of the present invention comprises a transmitting end 10, a receiving end 20 and a microcontroller, wherein the transmitting end 10 and the receiving end 20 are connected to the microcontroller.

[0027] The transmitting end 10 comprises an infrared transmitting tube, a transmitting control circuit and a synchronization circuit. The infrared transmitting tube is connected to the transmitting control circuit, the transmitting control circuit is connected to the synchronization circuit, and the synchronization circuit is connected to a microcontroller.

[0028] The receiving end 20 includes an optical receiving tube, a receiving control circuit and a receiving amplifying circuit. The optical receiving tube is connected to the receiving control circuit and the receiving amplifying circuit respectively. The receiving control circuit and the receiving amplifying circuit are connected to a microcontroller respectively.

[0029] The position of the infrared emitting tube corresponds to the position of the light receiving tube.

[0030] The microcontroller is connected with an output signal circuit.

[0031] The high-speed light curtain sensor synchronization system of the present invention has multiple signal output modes, including NPN switch signal output and PNP switch signal output, 4-20mA current analog output, 0-10V voltage analog output, RS485 circuit output, etc.

[0032] That is, the output signal circuit can be one of an NPN output circuit, a PNP output circuit, a 4-20mA current analog output circuit, a 0-10V voltage analog output circuit, and an RS485 output circuit.

[0033] The microcontroller controls the infrared transmitting tubes to transmit infrared rays in turn through the transmitting control circuit, and controls the optical receiving tubes to receive infrared rays in turn through the receiving control circuit. The microcontroller detects the received optical signals through the receiving amplification circuit, and determines whether there is an object blocking the transmitting end 10 and the receiving end 20 by judging the number of optical signals, thereby achieving the detection purpose.

[0034] Specifically, the microcontroller controls the transmitting control circuit to control the infrared transmitting tube through the synchronization circuit, so that only one infrared transmitting tube emits light at a certain moment, and the infrared transmitting tube transmits a light signal to the receiving end 20. The microcontroller controls the light receiving tube through the receiving control circuit, so that at the same time, only the receiving signal of the light receiving tube at the corresponding position is connected to the receiving amplifier circuit, and the signal of the light receiving tube is amplified to the amplitude that the microcontroller can recognize through the receiving amplifier circuit. The microcontroller records the current signal state, and this completes the scanning of one channel. Then the scanning of the next channel is carried out, and so on. The microcontroller controls all infrared transmitting tubes to transmit signals once in turn, and at the same time, the microcontroller controls all light receiving tubes to receive signals once in turn, that is, all channels are scanned once, so as to complete a cycle of scanning. Finally, the microcontroller determines whether there is an object blocking between the transmitting end 10 and the receiving end 20 by calculating the number and state of the received light signals, and outputs the corresponding output signal by controlling the output signal circuit, thereby achieving the detection purpose.

[0035] The high-speed light curtain sensor synchronization system of the present invention utilizes a microcontroller to simultaneously control the transmitting end 10 and the receiving end 20, so there is no problem of signal synchronization and delay between the two microcontrollers. The time for transmitting a channel can be greatly shortened. After testing on an actual circuit board, this time is 10 microseconds, which is much faster than the 250 microseconds of the ordinary two microcontroller solution. The speed of light curtain detection is greatly improved, and the problem of slow detection speed of light curtain sensors in the prior art can be effectively solved.

[0036] The transmitting end 10 and the receiving end 20 are separated from each other and placed opposite to each other. The transmitting end 10 and the receiving end 20 are both tubular, coplanar and parallel. The transmitting end 10 is used to transmit optical signals, and the receiving end 20 is used to detect optical signals and transmit them to a microcontroller for processing.

[0037] The high-speed light curtain sensor synchronization system of the present invention further comprises a core circuit board, the microcontroller is arranged on the core circuit board, and the core circuit board is also provided with capacitors, inductors, resistors and a crystal oscillator.

[0038] The transmitting end 10 and the receiving end 20 are respectively connected to the microcontroller via a synchronization cable 30. The transmitting end 10 transmits a light beam signal 40, and the receiving end 20 receives the light beam signal 40.

[0039] The transmitting end 10 comprises a transmitting end shell 104 , and a first end cap 103 and a second end cap 105 are respectively fixed to two ends of the transmitting end shell 104 . The first end cap 103 and the second end cap 105 are used to seal the two ends of the transmitting end shell 104 .

[0040] A filter 101 is disposed on one side of the transmitting end housing 104 , and the filter 101 is fixed to the light beam emitting side of the transmitting end housing 104 .

[0041] The infrared emitting tube is arranged inside the filter 101, and includes a plurality of infrared emitting diodes arranged in a row. The infrared emitting diodes are located inside the transmitting end housing 104, and the light beams emitted by the infrared emitting diodes are emitted outward through the filter 101. The number of the light receiving tubes is the same as the number of the infrared emitting diodes, and the light receiving tubes correspond to the infrared emitting diodes one by one.

[0042] A transmitter circuit board 102 is disposed in the transmitter housing 104 , and the infrared emitting diode is connected to the transmitter circuit board 102 .

[0043] The transmitter housing 104 is made of aluminum profiles. A mounting groove is provided in the transmitter housing 104 , and the transmitter circuit board 102 is provided in the mounting groove.

[0044] One end of the synchronization cable 30 extends from the second end cap 105 into the transmitter housing 104 and is connected to the transmitter circuit board 102 .

[0045] The transmission control circuit is disposed on the transmission end circuit board 102 .

[0046] The structure of the receiving end 20 is similar to that of the transmitting end 10, except that the receiving end 20 includes a receiving end circuit board and an optical receiving tube. The receiving amplifying circuit is arranged on the receiving end circuit board, and the receiving amplifying circuit includes a signal amplifying chip.

[0047] The transmitting end circuit board 102 and the receiving end circuit board both include a control computing hub.

[0048] The transmitting end circuit board 102 and the receiving end circuit board are respectively connected to the core circuit board.

[0049] The high-speed light curtain sensor synchronization system of the present invention further includes a power supply circuit board, which is connected to the core circuit board for supplying power.

[0050] The high-speed light curtain sensor synchronization system of the present invention further includes a synchronization circuit board, which is connected to the core circuit board, and the synchronization circuit is arranged on the synchronization circuit board, which is located in the transmitting end 10. A synchronization signal chip is arranged on the synchronization circuit board.

[0051] The high-speed light curtain sensor synchronization system of the present invention further comprises a signal output circuit board, wherein the signal output circuit board is connected to the core circuit board, and the output signal circuit is arranged on the signal output circuit board.

[0052] The receiving end 20 includes a receiving end housing, a receiving filter is arranged on one side of the receiving end housing, and the receiving filter is fixed on the receiving end housing so that the infrared light emitted by the infrared emitting diode is received by the light receiving tube after passing through the receiving filter. The receiving end housing is arranged opposite to the transmitting end housing 104.

[0053] The synchronization cable 30 adopts a shielded cable, and the synchronization cable 30 includes a connector 301, a plastic sheath 302, a metal shielding wire 303 and a multi-strand electric wire 304, the metal shielding wire 303 wraps the multi-strand electric wire 304, the plastic sheath 302 wraps the metal shielding wire 303, and the connector 301 is arranged at the end of the synchronization cable 30 for connecting the transmitting end 10 or the receiving end 20.

[0054] Compared with the prior art, the high-speed light curtain sensor synchronization system of the present invention uses a microcontroller to simultaneously control the transmitting end 10 and the receiving end 20. Therefore, there is no problem of signal synchronization and delay between the two microcontrollers. The time for transmitting a channel can be greatly shortened. After testing on an actual circuit board, this time is 10 microseconds, which is much faster than the 250 microseconds of the ordinary two microcontroller solution. The speed of light curtain detection is greatly improved, and the problem of slow detection speed of light curtain sensors in the prior art can be effectively solved.

[0055] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any modifications, equivalent substitutions and improvements made within the concept of the present invention should be included in the patent protection scope of the present invention.

Claims

1. High-speed light curtain sensor synchronization system, characterized in that: It includes a transmitting end, a receiving end and a microcontroller, wherein the transmitting end and the receiving end are commonly connected to the microcontroller; The transmitting end comprises an infrared transmitting tube, a transmitting control circuit and a synchronization circuit, wherein the infrared transmitting tube is connected to the transmitting control circuit, the transmitting control circuit is connected to the synchronization circuit, and the synchronization circuit is connected to the microcontroller; The receiving end includes an optical receiving tube, a receiving control circuit and a receiving amplifying circuit, wherein the optical receiving tube is connected to the receiving control circuit and the receiving amplifying circuit respectively, and the receiving control circuit and the receiving amplifying circuit are connected to a microcontroller respectively; The microcontroller is connected with an output signal circuit.

2. The high-speed light curtain sensor synchronization system according to claim 1, characterized in that: The transmitting end and the receiving end are separated from each other and placed opposite to each other. Both the transmitting end and the receiving end are tubular, coplanar and parallel. The transmitting end is used to transmit optical signals, and the receiving end is used to detect optical signals and transmit them to a microcontroller for processing.

3. The high-speed light curtain sensor synchronization system according to claim 2, characterized in that: The microcontroller controls the infrared transmitting tubes to transmit infrared rays in turn through the transmitting control circuit, and controls the optical receiving tubes to receive infrared rays in turn through the receiving control circuit. The microcontroller detects the received optical signals through the receiving amplification circuit, and determines whether there is an object blocking the transmitting end and the receiving end by judging the number of optical signals.

4. The high-speed light curtain sensor synchronization system according to claim 1, characterized in that: The transmitting end and the receiving end are connected to the microcontroller via synchronization cables respectively.

5. The high-speed light curtain sensor synchronization system according to claim 4, characterized in that: The synchronous cable adopts a shielded cable, which includes a connector, a plastic sheath, a metal shielding wire and multiple wires. The metal shielding wire wraps the multiple wires, and the plastic sheath wraps the metal shielding wire. The connector is arranged at the end of the synchronous cable for connecting the transmitting end or the receiving end.

6. The high-speed light curtain sensor synchronization system according to claim 1, characterized in that: The transmitting end includes a transmitting end shell, and the two ends of the transmitting end shell are respectively fixed with a first end cap and a second end cap, and the first end cap and the second end cap are used to seal the two ends of the transmitting end shell; a filter is provided on one side of the transmitting end shell, and the filter is fixed on the light beam emitting side of the transmitting end shell.

7. The high-speed light curtain sensor synchronization system according to claim 6, characterized in that: The infrared emitting tube is arranged on the inner side of the filter, and the infrared emitting tube includes a plurality of infrared emitting diodes arranged in a row. The infrared emitting diodes are located inside the transmitting end housing, and the light beam emitted by the infrared emitting diodes is emitted outward through the filter; the number of the light receiving tubes is the same as the number of the infrared emitting diodes, and the light receiving tubes correspond to the infrared emitting diodes one by one.

8. The high-speed light curtain sensor synchronization system according to claim 7, characterized in that: A transmitter circuit board is arranged in the transmitter shell, and the infrared emitting diode is connected to the transmitter circuit board; the transmitter shell is made of aluminum profile, and a mounting groove is arranged in the transmitter shell, and the transmitter circuit board is arranged in the mounting groove.

9. The high-speed light curtain sensor synchronization system according to claim 1, characterized in that: The receiving end includes a receiving end circuit board, the receiving amplifying circuit is arranged on the receiving end circuit board, and the receiving amplifying circuit includes a signal amplifying chip.

10. The high-speed light curtain sensor synchronization system according to claim 1, characterized in that: The high-speed light curtain sensor synchronization system also includes a synchronization circuit board. The synchronization circuit is arranged on the synchronization circuit board. The synchronization circuit board is located in the transmitting end. A synchronization signal chip is arranged on the synchronization circuit board.

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