Pulse synchronization light curtain

Abstract

The utility model relates to the field of safety light curtains, and provides a pulse synchronization light curtain which comprises a transmitting device and a receiving device, the transmitting device comprises a first MCU module, a first timer, a first selection switch and a plurality of transmitting lamps, and the receiving device comprises a second MCU module, a second timer, a second selection switch and a plurality of receiving lamps. The number of the transmitting lamps is the same as that of the receiving lamps, the multiple transmitting lamps and the multiple receiving lamps correspond in sequence, and the corresponding transmitting lamps and the corresponding receiving lamps are located at the same height; without a lead, the pulse synchronization is realized, the installation is simple, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the field of safety light curtains, in particular to a pulse synchronous light curtain. Background Art

[0002] With the development of science and technology, light curtains are widely used in security inspection and other fields. Since the transmitting end and the receiving end of the light curtain are separated by the detected object, when the space requirement of the detected range is large, the transmitting end and the receiving end are separated by several meters and become independent individuals, such as Figure 1 As shown, it is divided into a transmitting end, a detected area, and a receiving end.

[0003] Light curtain synchronization means that the light emitted by the transmitting optical axis at the same height can only be received by the receiving optical axis at the same height (when there is no obstruction between the transmitting end and the receiving end). Figure 1 Taking the 16 optical axis light curtain detection device shown as an example, there are 16 light-emitting axes at the transmitting end and 16 receiving axes at the receiving end, and the first receiving axis only receives light emitted by the first light-emitting axis, the second receiving axis only receives light emitted by the second light-emitting axis...the 16th receiving axis only receives light emitted by the 16th light-emitting axis.

[0004] When no object passes between the transmitting end and the receiving end, the 16 receiving optical axes can receive the light of the 16 transmitting optical axes, and the output of the receiving end is 0; when an object passes between the transmitting end and the receiving end, the light received by one or more of the 16 receiving optical axes is weakened, and the output of the receiving end is 1; the timing starts from the time when the receiving channel switches to the first channel and the first channel starts receiving, until the receiving switch switches to the 16th channel and the 16th channel completes receiving, the received light intensity of all 16 channels is recorded, and the timing is completed when a switch signal of 0 or 1 is output according to the light intensity. The time from the start of timing to the end of timing is an output cycle of the light curtain; the next cycle starts from the first channel and ends at the 16th channel, and a new output cycle begins.

[0005] However, the existing light curtain synchronization generally adopts the line synchronization method, connecting the transmitter and the receiver with a wire, and the transmitter transmits the synchronization signal to the receiver through the wire. For example, when the first light-emitting axis emits light, the transmitter transmits the synchronization signal to the receiver through the wire, and confirms that it is received by the first receiving axis, and so on, synchronization is achieved. This method requires additional cable installation, which is costly and troublesome to install, and is inconvenient to use at a long distance. Utility Model Content

[0006] The problem solved by the utility model is how to provide a light curtain which does not need wires and is synchronized by pulses.

[0007] In order to solve the above problems, the utility model provides a pulse synchronous light curtain, comprising: a transmitting device and a receiving device;

[0008] The transmitting device includes a first MCU module, a first timer, a first selection switch and a plurality of transmitting lights, and the receiving device includes a second MCU module, a second timer, a second selection switch, and a plurality of receiving lights. The number of the transmitting lights and the receiving lights is the same, and the plurality of transmitting lights and the receiving lights correspond to each other in sequence, and the corresponding transmitting lights and the receiving lights are at the same height;

[0009] The first timer is connected to the first MCU module, the input end of the first selection switch is connected to the pulse signal, the controlled end is connected to the first MCU module, and the multiple selection output ends are respectively connected to one of the emission lights. The first MCU module sends a selection signal to the first selection switch according to the switching duration, switches the emission lights in turn, and sends a pulse signal to the emission lights, and the emission lights light up according to the pulse signal;

[0010] The second timer is connected to the second MCU module, the multiple selection input ends of the second selection switch are respectively connected to one of the receiving lights, the controlled end is connected to the output end of the second MCU module, and the output end is connected to the signal receiving end of the second MCU module. The second MCU module sends a selection signal to the second selection switch according to the switching duration to switch the corresponding receiving light. After receiving the light signal, the receiving light sends a level signal to the second MCU module.

[0011] Furthermore, there are multiple first selection switches and multiple second selection switches, and the multiple first selection switches are respectively connected to the first MCU module, and the multiple second selection switches are respectively connected to the second MCU module.

[0012] Furthermore, the receiving device also includes a filter amplifier circuit, which is connected in series between the output end of the second selection switch and the signal receiving end of the second MCU module.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] When in use, the two timers give time signals to the MCUs at the transmitting and receiving ends respectively. The first MCU module can switch to different transmitting light pulse signals through the first selection switch, and the second MCU module can choose to receive the corresponding receiving light signal through the second selection switch. When the first receiving light receives the signal, the first MCU module and the second MCU module control the switching in turn at the same time interval, so that the corresponding transmitting light transmits the signal, and the receiving light transmits the receiving signal, thereby realizing signal synchronization. There is no need to set up an additional synchronization signal cable to connect the receiving device and the transmitting device, thus avoiding cable costs and installation, and achieving convenience, cost savings, and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the light curtain principle structure of the background technology of the utility model;

[0016] Figure 2 This is a schematic diagram of the principle structure of the launch device of the embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of the principle structure of the receiving device of an embodiment of the utility model. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0021] like Figure 2 and 3 As shown, the utility model provides a pulse synchronous light curtain, comprising: a transmitting device and a receiving device;

[0022] The transmitting device includes a first MCU module, a first timer, a first selection switch and a plurality of transmitting lights, and the receiving device includes a second MCU module, a second timer, a second selection switch, and a plurality of receiving lights. The number of the transmitting lights and the receiving lights is the same, and the plurality of transmitting lights and the receiving lights correspond to each other in sequence, and the corresponding transmitting lights and the receiving lights are at the same height;

[0023] The first timer is connected to the first MCU module, the input end of the first selection switch is connected to the pulse signal, the controlled end is connected to the first MCU module, and the multiple selection output ends are respectively connected to one of the emission lights. The first MCU module sends a selection signal to the first selection switch according to the switching duration, switches the emission lights in turn, and sends a pulse signal to the emission lights, and the emission lights light up according to the pulse signal;

[0024] The second timer is connected to the second MCU module, the multiple selection input ends of the second selection switch are respectively connected to one of the receiving lights, the controlled end is connected to the output end of the second MCU module, and the output end is connected to the signal receiving end of the second MCU module. The second MCU module sends a selection signal to the second selection switch according to the switching duration to switch the corresponding receiving light. After receiving the light signal, the receiving light sends a level signal to the second MCU module.

[0025] It should be noted that when in use, the two timers give time signals to the MCUs at the transmitting and receiving ends respectively. The first MCU module can switch to different transmitting light pulse signals through the first selection switch, and the second MCU module can choose to receive the corresponding receiving light signal through the second selection switch. When the first receiving light receives the signal, the first MCU module and the second MCU module control the switching in turn at the same time interval, so that the corresponding transmitting light transmits the signal, and the receiving light transmits the receiving signal, thereby realizing signal synchronization. There is no need to set up an additional synchronization signal cable to connect the receiving device and the transmitting device, thus avoiding cable costs and installation.

[0026] Specifically, Figure 2 and 3 As shown, taking the example that the transmitting device and the receiving device are respectively provided with 16 transmitting lights and receiving lights, the receiving light S1 at the receiving end and the transmitting light D1 at the transmitting end are at the same horizontal height, the receiving light S2 at the receiving end and the transmitting light D2 at the transmitting end are at the same horizontal height... The receiving light S16 at the receiving end and the transmitting light D16 at the transmitting end are at the same horizontal height, and an 8-to-1 selection switch is adopted, so 2 first selection switches and 2 second selection switches are respectively set, and other types of switches can also be used. When the number of transmitting lights and receiving lights changes, the corresponding number of selection switches can be selected according to the number, and multiple first selection switches are respectively connected to the first MCU module, and multiple second selection switches are respectively connected to the second MCU module, so as to control the selection channel.

[0027] In this embodiment, the transmitting device is as follows Figure 2As shown, taking the switching interval of 300 microseconds as an example, the width of the high level of the pulse signal is 30 microseconds, and the interval is 270 microseconds. By selecting the switch, the channel of the selection switch is changed once every 300 microseconds, so that the transmitting lights D1 to D16 are connected to the first MCU module at intervals of 300 microseconds in sequence, and the received pulse signal lights up. The next cycle starts from D1 and ends at D16, and cycles in sequence. The transmitting signal of the first transmitting light D1 is used as the synchronous light signal. Each time the power is turned on or the light curtain is changed from standby to working state, the first transmitting light D1 lights up first. Furthermore, at this time, the initial first transmitting light D1 can emit two 30 microsecond pulses at intervals, and the subsequent pulses are single 30 microseconds in sequence. This can ensure the accuracy of the detection of the initial signal.

[0028] The receiving device is Figure 3 As shown, each channel of the receiving device takes 300 microseconds, and the switching time is the same as that of the transmitting device. In the initial standby state, the second selection switch is in the first on-off state, that is, when the first receiving lamp S1 receives the signal of the first transmitting lamp D1, the switching cycle of 300 microseconds for each receiving channel starts. If the first transmitting lamp D1 uses two 30 microsecond pulses with intervals (lighting up for 30 microseconds and then turning off for 120, then lighting up for 30 microseconds and then turning off for 120 microseconds, a total of 300 microseconds), then when the first receiving lamp S1 receives the signal, the second MCU module receives two pulse signals from the first receiving lamp S1 (that is, the second 30 microsecond signal ends, and after the timing is 120 microseconds, the 300-microsecond switching of each channel starts in turn), and the cycle starts, which can effectively prevent misjudgment.

[0029] When there is no obstruction, the receiving light will send a high level to the second MCU module. Starting from the first receiving light S1, the second MCU module counts and cycles 16 times. When the signal is received and recorded 16 times, it is considered that there is no object blocking the detection area, and the second MCU module outputs 0. From 1 to 16, if one or more channels do not receive the signal, it is considered that there is an object blocking the detection area. The second MCU module 1 outputs a 0 or 1 signal at the receiving end, and both the transmitting end and the receiving end switch to the first channel and continue to start from the first receiving light S1 to enter the next cycle.

[0030] In one embodiment of the utility model, the receiving device also includes a filtering and amplifying circuit, which is connected in series between the output end of the second selection switch and the signal receiving end of the second MCU module, and is used to filter and amplify the received signal to improve anti-interference performance and facilitate reception by the second MCU module.

[0031] Although the disclosure is as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A pulse synchronous light curtain, characterized in that: include: Transmitting device and receiving device; The transmitting device includes a first MCU module, a first timer, a first selection switch and a plurality of transmitting lights, and the receiving device includes a second MCU module, a second timer, a second selection switch, and a plurality of receiving lights. The number of the transmitting lights and the receiving lights is the same, and the plurality of transmitting lights and the receiving lights correspond to each other in sequence, and the corresponding transmitting lights and the receiving lights are at the same height; The first timer is connected to the first MCU module, the input end of the first selection switch is connected to the pulse signal, the controlled end is connected to the first MCU module, and the multiple selection output ends are respectively connected to one of the emission lights. The first MCU module sends a selection signal to the first selection switch according to the switching duration, switches the emission lights in turn, and sends a pulse signal to the emission lights, and the emission lights light up according to the pulse signal; The second timer is connected to the second MCU module, the multiple selection input ends of the second selection switch are respectively connected to one of the receiving lights, the controlled end is connected to the output end of the second MCU module, and the output end is connected to the signal receiving end of the second MCU module. The second MCU module sends a selection signal to the second selection switch according to the switching duration to switch the corresponding receiving light. After receiving the light signal, the receiving light sends a level signal to the second MCU module.

2. The pulse synchronous light curtain according to claim 1, characterized in that: There are multiple first selection switches and multiple second selection switches, and the multiple first selection switches are respectively connected to the first MCU module, and the multiple second selection switches are respectively connected to the second MCU module.

3. The pulse synchronous light curtain according to claim 1, characterized in that: The receiving device further includes a filter amplifier circuit, which is connected in series between the output end of the second selection switch and the signal receiving end of the second MCU module.

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