Light curtain control device

Abstract

The utility model relates to the technical field of light curtains, in particular to a light curtain control device which comprises a channel auxiliary control board. The light curtain emission main control board is electrically connected with the channel auxiliary control board; the light curtain emission expansion board is cascaded with the light curtain emission main control board and is provided with an infrared emission tube; a channel main control board; the light curtain receiving main control board is electrically connected with the channel main control board; and the light curtain receiving expansion board is cascaded with the light curtain receiving main control board and is provided with an infrared receiving tube matched with the infrared transmitting tube. According to the scheme, when multiple light curtains are used in one device, the occupied interface resources of the channel auxiliary control board and the channel main control board are reduced, wires are effectively saved, and wiring is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of light curtains, in particular to a light curtain control device. Background Art

[0002] With the continuous development of light curtain technology, light curtains are applied to some dangerous equipment, induction doors, security, elevators, gate passages, etc. where human-machine collaboration is required. In the application scenario where multiple light curtains are used in one device, a container system is disclosed in the Chinese invention application with publication number CN109767557A (hereinafter referred to as Document 1), in which a light curtain transmitter 281 and a light curtain receiver 282 are respectively arranged on the top of the box 21, multiple shelves 25 and / or the bottom of the box 21 for dividing each storage layer of the container, that is, a set of light curtain transmitters 281 and light curtain receivers 282 are installed on the storage layer between two adjacent layers, and are configured to detect whether there is an object entering the shelf 25 of the layer. If an object enters, the light curtain receiver 282 sends a detection signal, and the main control module 13 controls the camera 26 on the top of the storage layer to capture an image.

[0003] However, the solution of document 1 still has the following problems: in the application of using multiple light curtains in one device, many light curtain wires will be connected to the main control module, which will cause the main control module to have more interfaces and more wiring, which is not simple enough. Utility Model Content

[0004] The utility model aims to provide a light curtain control device to address the deficiencies of the prior art, aiming to reduce wire materials, simplify wiring, and avoid occupying too many main control interfaces.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions: a light curtain control device, comprising:

[0006] Channel sub-control panel;

[0007] A light curtain emission main control board is electrically connected to the channel sub-control board;

[0008] A light curtain emission expansion board is cascaded with the light curtain emission main control board and has an infrared emission tube;

[0009] Channel main control board;

[0010] A light curtain receiving main control board, electrically connected to the channel main control board; and

[0011] The light curtain receiving expansion board is cascaded with the light curtain receiving main control board and has an infrared receiving tube matching the infrared transmitting tube.

[0012] As a further solution of the utility model: the light curtain receiving main control board is electrically connected to the light curtain transmitting main control board.

[0013] As a further solution of the utility model: the light curtain emission extension board has at least two, including a first emission extension board cascaded with the light curtain emission main control board and a second emission extension board cascaded with the first emission extension board;

[0014] The light curtain receiving extension board has at least two, including a first receiving extension board matched with the first transmitting extension board and cascaded to the light curtain receiving main control board, and a second receiving extension board matched with the second transmitting extension board and cascaded to the first receiving extension board.

[0015] As a further solution of the utility model: the light curtain transmitting main control board or the light curtain transmitting extension board or the light curtain receiving main control board or the light curtain receiving extension board has an extended output port for cascading and connected in parallel with a filter capacitor.

[0016] As a further solution of the utility model: the filter capacitor is not greater than 100NF.

[0017] As a further solution of the utility model: the light curtain transmitting main control board and / or the light curtain receiving main control board has an MCU with a clock frequency of 1KHz to 1.5KHz.

[0018] As a further solution of the utility model: the MCU has a grounded clock signal port and a grounded DATA data signal port.

[0019] As a further solution of the utility model: a shielded line cascade is used between the light curtain transmitting main control board and the light curtain transmitting extension board; a shielded line cascade is used between the light curtain receiving main control board and the light curtain receiving extension board.

[0020] As a further solution of the utility model: the first transmitting extension board and the second transmitting extension board are cascaded by shielded wires; the first receiving extension board and the second receiving extension board are cascaded by shielded wires.

[0021] As a further solution of the utility model: the shielding wire is grounded.

[0022] Beneficial effects of the utility model:

[0023] In this solution, a light curtain transmitting main control board is cascaded with multiple light curtain transmitting extension boards to realize the transmission of multiple light curtains at the transmitting end, and a light curtain receiving main control board is cascaded with multiple light curtain receiving extension boards to realize the reception of multiple light curtains at the receiving end, and finally the data is processed by the channel sub-control board and the channel main control board respectively, so as to realize the use of multiple safety light curtains in the light curtain control device. Among them, the main control end responsible for data processing, that is, the channel sub-control board and the channel main control board only communicate with the light curtain transmitting main control board and the light curtain receiving main control board respectively, without directly corresponding to multiple light curtain transmitting extension boards and multiple light curtain receiving extension boards, so as to reduce the interface resources occupied by the channel sub-control board and the channel main control board when multiple light curtains are used, effectively save wires, and simplify wiring. In addition, since in the prior art, multiple light curtain wires are directly connected to the main controller, and the distances from different light curtains to the main controller are different, the wires are too long and complicated, causing high-speed signals to form radiation interference after passing through the wires. This solution simplifies the wiring, shortens the wire connection, and effectively reduces radiation interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an existing light curtain gate.

[0025] Figure 2 The utility model is a schematic structural diagram of an embodiment.

[0026] Figure 3 It is a circuit flow chart of the utility model.

[0027] Figure 4 The present invention is a schematic block diagram of the circuit structure of the light curtain emission main control board.

[0028] Figure 5 It is a partial circuit diagram of the light curtain emission main control board of the utility model.

[0029] Figure 6 The present invention is a schematic block diagram of a circuit structure of the light curtain emission expansion board.

[0030] Figure 7 for Figure 6 A partial circuit diagram.

[0031] Figure 8 This is another schematic block diagram of the circuit structure of the light curtain emission expansion board of the utility model.

[0032] Fig. 9 for Figure 8 A partial circuit diagram.

[0033] Fig.10 The present invention is a schematic block diagram of the circuit structure of the light curtain receiving main control board.

[0034] Fig.11 This is a partial circuit diagram of the light curtain receiving main control board of the utility model.

[0035] Fig.12 The present invention is a schematic block diagram of a circuit structure of the light curtain receiving expansion board.

[0036] Fig.13 for Fig.12 A partial circuit diagram.

[0037] Fig.14 This is another schematic block diagram of the circuit structure of the light curtain receiving expansion board of the utility model.

[0038] Fig.15 for Fig.14 A partial circuit diagram.

[0039] Reference numerals include:

[0040] 10-channel auxiliary control board, T8A-light curtain transmission main control board,

[0041] 11—Light curtain transmission expansion board;

[0042] 20—channel main control board, R8A—light curtain receiving main control board,

[0043] 21—Light curtain receiving expansion board;

[0044] 3—Shielded wire. DETAILED DESCRIPTION

[0045] The utility model is described in detail below with reference to the accompanying drawings.

[0046] like Figure 1 to Figure 15 As shown, in an embodiment of the utility model, a light curtain control device is provided, including: a channel sub-control board 10, a light curtain transmitting main control board T8A, a light curtain transmitting extension board 11, a channel main control board 20, a light curtain receiving main control board R8A and a light curtain receiving extension board 21; wherein:

[0047] The light curtain transmitting main control board T8A is electrically connected to the channel sub-control board 10;

[0048] The light curtain emission expansion board 11 is cascaded with the light curtain emission main control board T8A and has an infrared emission tube;

[0049] The light curtain receiving main control board R8A is electrically connected to the channel main control board 20;

[0050] The light curtain receiving expansion board 21 is cascaded with the light curtain receiving main control board R8A and has an infrared receiving tube that matches the infrared transmitting tube. Specifically, Figure 2 and Figure 3As shown, there are at least two light curtain transmission expansion boards 11 and they are cascaded step by step, and the light curtain receiving expansion boards 21 match the light curtain transmission expansion boards 11 and they are also cascaded step by step; thus, the interface resources occupied by the channel sub-control board 10 and the channel main control board 20 are reduced to save wires and reduce signal interference. The light curtain transmission main control board T8A and the light curtain transmission expansion board 11 each have at least one infrared transmitting tube, such as Figure 5 The infrared emitting diode D5 in the transmitting circuit 1, Figure 7 and Fig. 9 The infrared emitting diode D1 in the transmitting circuit 1 is shown.

[0051] In this solution, a light curtain transmitting main control board T8A is used to cascade multiple light curtain transmitting extension boards 11 to achieve the transmission of multiple light curtains at the transmitting end, and a light curtain receiving main control board R8A is used to cascade multiple light curtain receiving extension boards 21 to achieve the reception of multiple light curtains at the receiving end, and finally the data is processed through the channel sub-control board 10 and the channel main control board 20 respectively, so as to realize the use of multiple safety light curtains in the light curtain control device. Among them, the main control end responsible for data processing, that is, the channel sub-control board 10 and the channel main control board 20 only communicate with the light curtain transmitting main control board T8A and the light curtain receiving main control board R8A respectively, without directly corresponding to the multiple light curtain transmitting extension boards 11 and the multiple light curtain receiving extension boards 21, so as to reduce the occupation of the interface resources of the channel sub-control board 10 and the channel main control board 20 when multiple light curtains are used, effectively save wires, and simplify wiring. In addition, since in the prior art, multiple light curtain wires are directly connected to the main controller, and the distances from different light curtains to the main controller are different, the wires are too long and complicated, causing high-speed signals to form radiation interference after passing through the wires. This solution simplifies the wiring, shortens the wire connection, and effectively reduces radiation interference.

[0052] In one embodiment, Figure 3 , Figure 4 and Fig.10 As shown, the light curtain receiving main control board R8A is electrically connected to the light curtain transmitting main control board T8A. Specifically, the 485 port of the light curtain transmitting main control board T8A is connected to the 485 port of the light curtain receiving main control board R8A through a 485 synchronization circuit. Then, when emitting infrared light, the transmitting end will send a synchronization signal to the receiving end through the 485 synchronization circuit. Each time an infrared beam is emitted, a synchronization signal will be sent, thereby ensuring that the clocks of the transmitting end and the receiving end are consistent.

[0053] In another embodiment, Figure 2 and Figure 3 As shown, the light curtain transmitting extension board 11 has at least two, including a first transmitting extension board and a second transmitting extension board, the first transmitting extension board is cascaded with the light curtain transmitting main control board T8A, and the second transmitting extension board is cascaded with the first transmitting extension board;

[0054] The light curtain receiving expansion board 21 has at least two, including a first receiving expansion board and a second receiving expansion board, the first receiving expansion board matches the first transmitting expansion board and is cascaded to the light curtain receiving main control board R8A, and the second receiving expansion board matches the second transmitting expansion board and is cascaded to the first receiving expansion board. Specifically, due to the prior art, such as Figure 1 The figure shows the connection of a multi-light curtain gate in the prior art, wherein the transmitting end includes a first transmitting light curtain 101, a second transmitting light curtain 102, a third transmitting light curtain 103 and a fourth transmitting light curtain 104, and the receiving end includes a first receiving light curtain 201, a second receiving light curtain 202, a third receiving light curtain 203 and a fourth receiving light curtain 204. It can be seen that multiple light curtain lines 301 are directly connected to the transmitting main control end 10 or the receiving main control end 20, and the distances from different light curtains to the main control end are different, resulting in the light curtain line 301 connecting the light curtains being too long, causing high-speed signals to form radiation interference after passing through the wires, which often causes some IC chips with poor anti-interference capabilities to work abnormally, and the MCU cannot detect the END end signal. The MCU cannot perform the next round of patrol scanning, resulting in the light curtain being unable to be used normally. This solution uses a light curtain transmitting main control board T8A to cascade multiple light curtain transmitting expansion boards 11, reducing the interface resources occupied by the channel sub-control board 10; and uses a light curtain receiving main control board R8A to cascade multiple light curtain receiving expansion boards 21, reducing the interface resources occupied by the channel main control board 20. In addition, the wiring is simplified, the wire connection between multiple light curtains is shortened, and the radiation interference is effectively reduced. Figure 2 and Figure 3 As shown, the light curtain control device is a light curtain gate, T8A is the light curtain transmitting main control board T8A, and the light curtain transmitting extension board 11 includes a transmitting extension board T8B and a transmitting extension board T6B; R8A is the light curtain receiving main control board R8A, and the light curtain receiving extension board 21 includes a receiving extension board R8B and a receiving extension board R6B; wherein, the transmitting extension board T8B and the transmitting extension board T6B are both transmitting extension boards, the difference is that the transmitting extension board T8B has 8 transmitting circuits, and the transmitting extension board T6B has 6 transmitting circuits, that is, the PCB size is different, and the transmitting extension board T6B is shorter. According to the length of the actual application, different lengths of extension boards are selected for cascading, and the receiving extension board R8B and the receiving extension board R6B are the same. Each transmitting circuit corresponds to a transmitting tube, and the infrared light signal is transmitted in rotation from the first point to the last point of the light curtain transmitting main control board T8A, and only one infrared light transmitting tube is lit each time.

[0055] In yet another embodiment, Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 and Fig.15As shown, the light curtain transmitting main control board T8A or the light curtain transmitting extension board 11 or the light curtain receiving main control board R8A or the light curtain receiving extension board 21 has an extended output port for cascading and connected in parallel with a filter capacitor. Specifically, referring to the filter capacitor of the capacitor filter circuit and the extended output port of the extended interface output circuit in each figure, the port cascaded between the light curtain and the light curtain is connected in parallel with a filter capacitor of less than 100NF to GND, thereby filtering out clutter signals and reducing the frequency. Furthermore, when the CLK or DATA signal flows through the capacitor, the capacitor will be charged. Since the capacitance is very small, the filter capacitor is quickly filled, and a certain amount of clutter signals can be filtered out after passing through the filter capacitor.

[0056] In yet another embodiment, Figure 5 , Figure 7 , Fig. 9 , Fig.11 , Fig.13 and Fig.15 As shown, the filter capacitor in the capacitor filter circuit is not greater than 100NF. Specifically, the port cascaded between the light curtain and the light curtain is connected in parallel with a filter capacitor of less than 100NF to GND, thereby filtering out clutter signals and reducing the frequency. Furthermore, when the CLK or DATA signal flows through the capacitor, the capacitor will be charged. Since the capacitance is very small, the filter capacitor is quickly filled, and a certain amount of clutter signals can be filtered out after passing through the filter capacitor.

[0057] In another embodiment, if Figure 4 and Fig.10 As shown, the light curtain transmitting main control board T8A and / or the light curtain receiving main control board R8A have an MCU with a clock frequency of 1KHz to 1.5KHz. Specifically, the clock frequency of the MCU is preferably 1.16KHz. The program is modified to control the MCU to reduce the frequency of the CLK clock signal, thereby reducing the frequency to reduce radiation interference. The inventors have found that since the CLK clock signal frequency is very fast, the higher the frequency, the greater the radiation interference, and the greater the impact caused, so the CLK clock signal frequency is reduced by modifying the program, thereby reducing the frequency to reduce radiation interference.

[0058] In another embodiment, if Figure 4 and Fig.10 As shown, the MCU has a grounded clock signal port and a grounded DATA data signal port. Specifically, the PCB routing is optimized, and the routing of the CLK clock signal and the DATA data signal is grounded (GND), thereby reducing the radiation interference of CLK and DATA to other signals.

[0059] In another embodiment, if Figure 2 and Figure 3As shown, the light curtain transmitting main control board T8A and the light curtain transmitting extension board 11 are cascaded by a shielded wire 3; the light curtain receiving main control board R8A and the light curtain receiving extension board 21 are cascaded by a shielded wire 3. Specifically, the wires between the light curtains need to be connected by a shielded wire 3, and the shielded wire 3 needs to be grounded, thereby further reducing radiation interference.

[0060] In another embodiment, if Figure 2 and Figure 3 As shown, the first transmitting extension board and the second transmitting extension board are cascaded by a shielded wire 3; the first receiving extension board and the second receiving extension board are both cascaded by a shielded wire 3. Specifically, the wires between the light curtains need to be connected by a shielded wire 3, and the shielded wire 3 needs to be grounded, thereby further reducing radiation interference.

[0061] Another embodiment, such as Figure 2 and Figure 3 As shown, the shielding wire 3 is grounded. Specifically, the wires between the light curtains need to be connected by the shielding wire 3, and the shielding wire 3 needs to be grounded, thereby further reducing radiation interference.

[0062] Working principle of light curtain:

[0063] First, place the transmitter and the receiver in parallel at a distance of about 1 to 2 meters. The first infrared emitting diode of the transmitter faces the first infrared receiving diode of the receiving end to form the first infrared beam, and so on to form a row.

[0064] like Figure 4 and Figure 5 As shown, the MCU microcontroller at the transmitting end outputs a low level and converts the level to 5V through the HC04 NOT gate so that CLR enables the HC164 shift register to work. Then the MCU microcontroller at the transmitting end outputs a low level and converts the AB initial signal level to 5V through the HC04 NOT gate and sends it to the A and B pins of HC164; at this time, the MCU at the transmitting end can output a square wave CLK clock signal and convert the level through the HC04 NOT gate, and then pass through a NOT gate to control the shift register HC164 to shift the AB initial signal to T1, driving the NMOS tube Q1 of the transmitting circuit 1 to turn on, the infrared emitting diode D5 loop generates current, and the infrared emitting diode D5 emits an infrared beam. Its transmitting circuit is as shown in Figure 5 As shown in the figure; when NMOS tube Q1 is turned on (sending infrared light), current flows through resistor R25, and when NMOS tube Q1 is turned off (not sending infrared light), transistor Q3 is also turned off, returning the status of whether the transmission is completed to the MCU. When emitting infrared light, the transmitter will send a synchronization signal to the receiver through the 485 synchronization circuit;

[0065] like Fig.10 and Fig.11 As shown, the receiving end single-chip microcomputer MCU outputs a low level and converts the level to 5V through the HC04 non-gate to enable the CLR enable shift register HC164 to work. Then the receiving end single-chip microcomputer MCU outputs a low level and converts the AB initial signal level to 5V through the HC04 non-gate and sends it to the A and B pins of the shift register HC164; the receiving end MCU can output a square wave CLK clock signal and convert the level through the non-gate HC04, and then through a non-gate control shift register HC164 to shift the AB initial signal to drive the enable pin of the analog switch HC4066, so that the infrared beam signal R1 amplified and processed by the receiving circuit 1 is merged to the COM terminal through the analog switch HC4066, and then the beam point data signal is fed back to the receiving end single-chip microcomputer MCU for processing through the comparison circuit 393. For example, as long as one of the beams at one point is blocked, the receiving end single-chip microcomputer MCU will drive the optocoupler isolation circuit to change the output signal to realize the use of the safety light curtain. Or the state data of the light curtain blocking is output through the 485 circuit to realize the use of the measurement light curtain. This is only the working principle of the first beam. The working principles of the other beams are the same as the first beam. The MCU shifts and scans one by one through the CKL clock signal until it shifts to the infrared receiving tube of the last receiving circuit. The QH pin of the shift register HC164 returns the END end signal to the MCU through the terminal resistor of the tail board. After the MCU detects the END end signal, it continues to perform the next round of patrol scanning. Every time an infrared beam is emitted, a synchronization signal is sent to ensure that the clocks of the transmitter and the receiver are consistent.

[0066] In this solution, since a light curtain main board is cascaded with multiple light curtain expansion boards, the cascaded signal between the light curtains is a 5V TTL level signal, so the anti-interference ability is poor. The CLK clock signal and DATA data signal responsible for controlling the shift have neither high nor low frequencies, and the interference of burrs causes the frequency to reach as high as 735KHz. When the cascade wire between the light curtains is too long, the high-speed signal will cause radiation interference after passing through the wire, which often causes some IC chips with poor anti-interference ability to work abnormally, and the MCU cannot detect the END end signal. The MCU cannot perform the next round of patrol scanning, resulting in the light curtain being unable to be used normally. In order to solve these problems, this solution connects a filter capacitor of less than 100NF to GND in parallel at the port cascaded between the light curtains to filter out the clutter signal and reduce the frequency; modify the program to control the MCU to reduce the frequency of the CLK clock signal, reduce the frequency and reduce the radiation interference; optimize the routing of the PCB, and wrap the routing of the CLK clock signal and the DATA data signal with ground (GND). At the same time, the wires between the light curtains are connected with shielded wire 3, and shielded wire 3 needs to be grounded.

[0067] In summary, it can be seen that the utility model has the above-mentioned excellent characteristics, which can enhance the performance unprecedented in the prior art and become a product with great practical value.

[0068] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A light curtain control device, characterized in that: include: Channel sub-control panel (10); A light curtain emission main control board (T8A) is electrically connected to the channel auxiliary control board (10); A light curtain emission expansion board (11), cascaded with the light curtain emission main control board (T8A), has an infrared emission tube; Channel main control board (20); A light curtain receiving main control board (R8A) is electrically connected to the channel main control board (20); as well as The light curtain receiving expansion board (21) is cascaded with the light curtain receiving main control board (R8A) and has an infrared receiving tube matching the infrared transmitting tube.

2. The light curtain control device according to claim 1, characterized in that: The light curtain receiving main control board (R8A) is electrically connected to the light curtain transmitting main control board (T8A).

3. The light curtain control device according to claim 1, characterized in that: The light curtain emission extension board (11) has at least two, including a first emission extension board cascaded with the light curtain emission main control board (T8A) and a second emission extension board cascaded with the first emission extension board; The light curtain receiving extension board (21) has at least two, including a first receiving extension board matched with the first transmitting extension board and cascaded to the light curtain receiving main control board (R8A) and a second receiving extension board matched with the second transmitting extension board and cascaded to the first receiving extension board.

4. The light curtain control device according to any one of claims 1 to 3, characterized in that: The light curtain transmitting main control board (T8A) or the light curtain transmitting extension board (11) or the light curtain receiving main control board (R8A) or the light curtain receiving extension board (21) has an extended output port for cascading and connected in parallel with a filter capacitor.

5. The light curtain control device according to claim 4, characterized in that: The filter capacitor is no greater than 100NF.

6. The light curtain control device according to any one of claims 1 to 3, characterized in that: The light curtain transmitting main control board (T8A) and / or the light curtain receiving main control board (R8A) have an MCU with a clock frequency of 1KHz to 1.5KHz.

7. The light curtain control device according to claim 6, characterized in that: The MCU has a grounded clock signal port and a grounded DATA signal port.

8. The light curtain control device according to claim 1, characterized in that: The light curtain transmitting main control board (T8A) and the light curtain transmitting extension board (11) are cascaded using a shielded line (3); the light curtain receiving main control board (R8A) and the light curtain receiving extension board (21) are cascaded using a shielded line (3).

9. The light curtain control device according to claim 3, characterized in that: The first transmitting extension board and the second transmitting extension board are cascaded using a shielded wire (3); the first receiving extension board and the second receiving extension board are cascaded using a shielded wire (3).

10. The light curtain control device according to claim 8 or 9, characterized in that: The shielding wire (3) is grounded.

Images