Safety grating based on TOF distance measurement

Abstract

The utility model provides a safety grating based on TOF distance measurement. The safety grating comprises a frame and a plurality of distance measurement units arranged in the frame. Wherein the distance measuring unit internally comprises a receiver and an emitter, the emitter in the distance measuring unit emits laser pulses, the laser pulses make contact with the surface of an object and are reflected into the receiver, the distance between the object and the distance measuring unit is measured according to the time difference of emitting and receiving, and whether the object is an abnormal invading object or not is judged according to the distance value; relates to the technical field of photoelectric detection, and is characterized in that a transmitter and a receiver are integrated in the same unit based on the TOF ranging principle, the detection distance can be accurately set, the installation is convenient, the setting is simple, the detection distance is large, and the setting is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric detection, in particular to a safety grating based on TOF distance measurement. Background Art

[0002] Safety gratings are photoelectric safety protection devices, also known as safety protectors, punch protectors, infrared safety protection devices, etc. Generally speaking, safety gratings exist in pairs, divided into transmitting and receiving ends, including reflected safety gratings and diffuse reflection safety gratings.

[0003] The through-beam safety light grid is a photoelectric device consisting of a transmitter and a receiver. They are installed on both sides of the hazardous area. The transmitter emits a beam of light to the receiver to form a ray. When an object or a person enters between the rays, the beam is blocked, triggering an alarm or stopping the equipment. The disadvantage is that the installation requires alignment.

[0004] The diffuse reflection safety grating integrates the transmitter and receiver in the same unit. The transmitter emits a light beam to the area to be monitored, and the receiver receives the returned light beam. When the light beam is blocked by an object or a person, the receiver will trigger an alarm. The diffuse reflection grating determines the blockage based on detecting the intensity of the reflected light to determine whether there is an object in its detection area. If the intensity of the reflected light received by the receiver is sufficient, the sensor will generate a switch signal, indicating that there is an object; if the received light intensity is not enough to exceed the set threshold, the sensor will not generate a signal, indicating that there is no object in the detection area.

[0005] The advantages of diffuse reflection safety gratings are: easy installation, suitable for places with space constraints, and independent of precise alignment of the opposing beam position. However, diffuse reflection cannot accurately set the distance range, and the detection distance is short. There is an urgent need to set up a safety grating that includes all the advantages of diffuse reflection safety gratings and opposing beam safety gratings. Utility Model Content

[0006] In order to overcome the existing problems, the embodiment of the present application provides a safety grating based on TOF ranging. Based on the TOF ranging principle, the transmitter and receiver are integrated into the same unit, and the detection distance can be accurately set. It is easy to install and simple to set up. The detection distance is large and the setting is more accurate.

[0007] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0008] A safety grating based on TOF ranging includes a frame and a plurality of ranging units arranged inside the frame;

[0009] The ranging unit includes a receiver and a transmitter. The transmitter inside the ranging unit emits a laser pulse, which contacts the surface of the object and is reflected into the receiver. The distance between the object and the ranging unit is measured according to the time difference between emission and reception. According to the distance value, it is judged whether the object is an abnormal intrusion. Based on the TOF ranging principle, the transmitter and receiver are integrated into the same unit to form a ranging unit, and the detection distance can be accurately set. The installation is convenient, the setting is simple, and the detection range and detection distance are set more accurately.

[0010] Preferably, the frame is provided with a card slot at a position corresponding to the distance measuring unit, a light-transmitting plate is provided on a surface wall of the card slot, and a card plate is provided at a position corresponding to the card slot and the light-transmitting plate;

[0011] The light-transmitting plate is snap-connected with the card slot to protect the ranging unit inside the frame. The light-transmitting plate is placed inside the card slot, and one side of the light-transmitting plate is in contact with the card plate inside the card slot. The light-transmitting plate is limited by the card plate so that the light-transmitting plate can be stably installed inside the card slot.

[0012] Preferably, a connecting seat is provided at one end of the frame, and a base is provided at the other end of the frame;

[0013] Among them, the connecting seat and the surface wall of the base are both provided with a limit plate, and the limit plate is connected to the connecting seat and the base through connecting screws. The limit plate is a rotatable structure, and the limit plate is connected to the connecting seat and the base through screws, and the limit plate can rotate around the screw as the axis. When the light-transmitting plate is clamped in the slot, the limit plate is rotated, and the limit plate rotates around the screw as the axis, so that one end of the limit plate can be rotated to the surface wall of the light-transmitting plate, which is used to limit the light-transmitting plate.

[0014] Preferably, the connection socket and the base are connected to the frame by screws. A wiring socket is provided on the top of the connection socket for an external display screen. The connection socket, the base and the frame are fixed stably by screws, and the frame can be tightly installed through the base. Then, the wiring socket on the top of the connection socket is connected to the external display screen. On the one hand, the ranging unit inside the frame can be powered on, and on the other hand, the detection range and the detection threshold can be displayed on the display screen.

[0015] The advantages of the embodiments of the present application are:

[0016] 1. Based on the TOF ranging principle, the transmitter and receiver are integrated into the same unit, and the detection distance can be accurately set. It is easy to install, simple to set up, with a large detection distance and more accurate setting.

[0017] 2. A slot is provided at the intersection of the frame and the light-transmitting plate. The light-transmitting plate is placed in the slot, and the limit plate provided on the base and the surface wall of the connecting seat is rotated to clamp the limit plate on the surface wall of the light-transmitting plate to limit the position of the light-transmitting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the safety grating based on TOF ranging of the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the utility model based on TOF ranging safety grating without the light-transmitting plate;

[0021] Figure 3 This is a schematic diagram of the front view structure of the utility model based on TOF ranging safety grating without the light-transmitting plate;

[0022] Figure 4 This is a schematic diagram of the overall structure of the connecting seat in the safety grating based on TOF ranging of the utility model;

[0023] Figure 5 This is a schematic structural diagram of the first embodiment of the TOF ranging-based safety grating of the utility model;

[0024] Figure 6 It is a schematic structural diagram of the second embodiment of the safety grating based on TOF ranging of the utility model.

[0025] Description of main reference numerals:

[0026] 1. Frame; 2. Connecting seat; 3. Base; 4. Light-transmitting plate; 5. Card slot; 6. Distance measuring unit; 7. Limit plate; 8. Wiring seat; 9. Transmitter; 10. Receiver. DETAILED DESCRIPTION

[0027] The embodiment of the present application solves the problems in the prior art by providing a safety grating based on TOF ranging. Based on the TOF ranging principle, the transmitter and the receiver are integrated into the same unit, and the detection distance can be accurately set. The installation is convenient and the setting is simple. The detection range and the detection distance are set more accurately. A card slot is provided at the intersection of the frame and the light-transmitting plate. The light-transmitting plate is placed in the card slot. The limit plate is arranged on the surface wall of the light-transmitting plate through the base and the connecting seat, and the limit plate is connected to the surface wall of the light-transmitting plate to limit the light-transmitting plate.

[0028] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows:

[0029] Embodiment 1:

[0030] This embodiment provides a specific structure of a safety grating based on TOF ranging, such as Figure 1-6 As shown, it includes a frame 1 and a plurality of distance measuring units 6 arranged inside the frame 1, and the distance measuring units 6 and the frame 1 are detachably installed;

[0031] Among them, the ranging unit 6 includes a receiver 10 and a transmitter 9. The transmitter 9 inside the ranging unit 6 emits a laser pulse, which contacts the surface of the object and is reflected into the receiver 10. According to the time difference between transmission and reception, the distance between the object and the ranging unit 6 is measured. According to the distance value, it is determined whether the object is an abnormal intrusion. The distance between nodes is mainly measured by the flight time of the signal between the transmitter 9 and the receiver 10. Based on the TOF ranging principle, the transmitter 9 and the receiver 10 are integrated into the same unit to form the ranging unit 6, and the detection distance can be accurately set. The installation is convenient, the setting is simple, the detection distance is large and the setting is more accurate.

[0032] The frame 1 is provided with a card slot 5 at a position corresponding to the distance measuring unit 6, a light-transmitting plate 4 is provided on the surface wall of the card slot 5, and a card plate is provided at a position corresponding to the card slot 5 and the light-transmitting plate 4;

[0033] Among them, the light-transmitting plate 4 is snap-connected with the card slot 5 to protect the ranging unit 6 inside the frame 1. The light-transmitting plate 4 is placed inside the card slot 5, and one side of the light-transmitting plate 4 is in contact with the card plate inside the card slot 5. The light-transmitting plate 4 is limited by the card plate, so that the light-transmitting plate 4 can be stably installed inside the card slot 5.

[0034] A connecting seat 2 is provided at one end of the frame 1, and a base 3 is provided at the other end of the frame 1;

[0035] Among them, the surface walls of the connecting seat 2 and the base 3 are both provided with a limit plate 7, the limit plate 7 is connected to the connecting seat 2 and the base 3 by connecting screws, the limit plate 7 is a rotatable structure, the limit plate 7 is connected to the connecting seat 2 and the base 3 by screws, and the limit plate 7 can rotate around the screw as the axis, when the light-transmitting plate 4 is clamped in the slot 5, the limit plate 7 is rotated, and the limit plate 7 rotates around the screw as the axis, so that one end of the limit plate 7 can be rotated to the surface wall of the light-transmitting plate 4, which is used to limit the light-transmitting plate 4.

[0036] The connection between the connecting seat 2 and the base 3 and the frame 1 is achieved by screw connection. A terminal block 8 is provided at the top of the connecting seat 2 for an external display screen, which is not shown in the figure. The connecting seat 2, the base 3 and the frame 1 are fixed and stabilized by screws, and the frame 1 can be installed tightly through the base 3. Then, the terminal block 8 at the top of the connecting seat 2 is connected to the external display screen. On the one hand, the ranging unit 6 inside the frame 1 can be powered on, and on the other hand, the detection range and the detection threshold can be displayed on the display screen.

[0037] By adopting the above technical solution:

[0038] The safety grating is composed of several distance measuring units 6. According to the viewing angle of the receiver and the distance between the transmitter and the receiver, when the distance measuring unit 6 is composed of a transmitter 9 and a receiver 10, Figure 5 As shown, the protection range distance threshold can be manually set as the judgment threshold according to the on-site conditions; or, while ensuring that there are no obstructions within the protection range, an obstruction can be set at the edge of the protection range. The terminal controls the transmitter 9 in the distance measuring unit 6 to emit a laser. After the receiver 10 receives the reflected signal, the terminal records the flight time and distance as the judgment threshold corresponding to each transmitting unit. The terminal controls the transmitter 9 to cyclically emit laser pulses. When there is no foreign object invading the protection range, the time when the receiver 10 receives the reflected signal and the measured distance value are greater than or equal to the threshold corresponding to the transmitter 9. When there is an object blocking the detection range, the time interval and distance value measured by the receiver 10 will be less than the detection threshold, thereby judging that there is foreign object intrusion and outputting an abnormal signal.

[0039] Embodiment 2:

[0040] This embodiment provides a specific structure of a safety grating based on TOF ranging, such as Figure 1-6 As shown, it includes a frame 1 and a plurality of distance measuring units 6 arranged inside the frame 1, and the distance measuring units 6 and the frame 1 are detachably installed;

[0041] Among them, the ranging unit 6 includes a receiver 10 and a transmitter 9. The transmitter 9 inside the ranging unit 6 emits a laser pulse, which contacts an obstacle and is reflected into the receiver 10 to detect whether there is an obstacle. The TOF ranging method belongs to a two-way ranging technology, which mainly uses the flight time of the signal between the transmitter 9 and the receiver 10 to measure the distance between nodes. Based on the TOF ranging principle, the transmitter 9 and the receiver 10 are integrated into the same unit to form a ranging unit 6, and the detection distance can be accurately set. The safety grating combines the advantages of reflective and beam gratings, is easy to install, simple to set up, has a large detection distance and is more accurate in setting.

[0042] The frame 1 is provided with a card slot 5 at a position corresponding to the distance measuring unit 6, a light-transmitting plate 4 is provided on the surface wall of the card slot 5, and a card plate is provided at a position corresponding to the card slot 5 and the light-transmitting plate 4;

[0043] Among them, the light-transmitting plate 4 is snap-connected with the card slot 5 to protect the ranging unit 6 inside the frame 1. The light-transmitting plate 4 is placed inside the card slot 5, and one side of the light-transmitting plate 4 is in contact with the card plate inside the card slot 5. The light-transmitting plate 4 is limited by the card plate, so that the light-transmitting plate 4 can be stably installed inside the card slot 5.

[0044] A connecting seat 2 is provided at one end of the frame 1, and a base 3 is provided at the other end of the frame 1;

[0045] Among them, the surface walls of the connecting seat 2 and the base 3 are both provided with a limit plate 7, the limit plate 7 is connected to the connecting seat 2 and the base 3 by connecting screws, the limit plate 7 is a rotatable structure, the limit plate 7 is connected to the connecting seat 2 and the base 3 by screws, and the limit plate 7 can rotate around the screw as the axis, when the light-transmitting plate 4 is clamped in the slot 5, the limit plate 7 is rotated, and the limit plate 7 rotates around the screw as the axis, so that one end of the limit plate 7 can be rotated to the surface wall of the light-transmitting plate 4, which is used to limit the light-transmitting plate 4.

[0046] The connection between the connecting seat 2 and the base 3 and the frame 1 is achieved by screw connection. A terminal block 8 is provided at the top of the connecting seat 2 for an external display screen, which is not shown in the figure. The connecting seat 2, the base 3 and the frame 1 are fixed and stabilized by screws, and the frame 1 can be installed tightly through the base 3. Then, the terminal block 8 at the top of the connecting seat 2 is connected to the external display screen. On the one hand, the ranging unit 6 inside the frame 1 can be powered on, and on the other hand, the detection range and the detection threshold can be displayed on the display screen.

[0047] By adopting the above technical solution:

[0048] The safety grating is composed of several distance measuring units 6. According to the viewing angle of the receiver and the distance between the transmitter and the receiver, when the distance measuring unit 6 is composed of multiple transmitters 9 and one receiver 10, Figure 6 As shown, the protection range distance threshold can be manually set as the judgment threshold according to the on-site conditions; or, while ensuring that there are no obstructions within the protection range, an obstruction can be set at the edge of the protection range. The terminal controls the transmitter 9 in the distance measuring unit 6 to emit a laser. After the receiver 10 receives the reflected signal, the terminal records the flight time and distance as the judgment threshold corresponding to each transmitting unit. The terminal controls the transmitter 9 to cyclically emit laser pulses. When there is no foreign object invading the protection range, the time when the receiver 10 receives the reflected signal and the measured distance value are greater than or equal to the threshold corresponding to the transmitter 9. When there is an object blocking the detection range, the time interval and distance value measured by the receiver 10 will be less than the detection threshold, thereby judging that there is foreign object intrusion and outputting an abnormal signal.

[0049] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. Safety grating based on TOF ranging, characterized by: It comprises a frame (1) and a plurality of distance measuring units (6) arranged inside the frame (1); The distance measuring unit (6) comprises a receiver (10) and a transmitter (9) inside. The transmitter (9) inside the distance measuring unit (6) emits a laser pulse, which contacts the surface of an object and is reflected into the receiver (10). The distance between the object and the distance measuring unit (6) is measured based on the time difference between the emission and reception. Based on the distance value, it is determined whether the object is an abnormal intrusion.

2. The safety grating based on TOF ranging as claimed in claim 1, characterized in that: The frame (1) is provided with a slot (5) at a position corresponding to the distance measuring unit (6), and a light-transmitting plate (4) is provided on a surface wall of the slot (5); The light-transmitting plate (4) is snap-fitted to the snap-fit ​​slot (5) to protect the distance-measuring unit (6) inside the frame (1).

3. The safety grating based on TOF ranging as claimed in claim 1, characterized in that: A connecting seat (2) is provided at one end of the frame (1), and a base (3) is provided at the other end of the frame (1); Wherein, the surface walls of the connecting seat (2) and the base (3) are both provided with limiting plates (7).

4. The safety grating based on TOF ranging as claimed in claim 3, characterized in that: The top of the connection seat (2) is provided with a wiring seat (8) for connecting to an external display screen.

5. The safety grating based on TOF ranging as claimed in claim 2, characterized in that: A card plate is provided at a position corresponding to the card slot (5) and the light-transmitting plate (4).

6. The safety grating based on TOF ranging as claimed in claim 3, characterized in that: The limiting plate (7) is connected to the connecting seat (2) and the base (3) via connecting screws, and the limiting plate (7) is a rotatable structure.

7. The safety grating based on TOF ranging as claimed in claim 3, characterized in that: The connection seat (2) and the base (3) are both connected to the frame (1) by screw connection.

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