Photoelectric sensor

Abstract

The photoelectric sensor comprises a fixing plate, an upper circuit board and a lower circuit board, the upper end and the lower end of the fixing plate are connected with an upper mounting plate and a lower mounting plate respectively, an upper shell and a lower shell are screwed in the upper mounting plate and the lower mounting plate respectively, and the upper circuit board and the lower circuit board are installed in the upper shell and the lower shell respectively; a light-emitting element and a plurality of first receiving elements are mounted in the upper shell and are electrically connected with the upper circuit board; a plurality of second receiving elements are installed in the lower shell, and the second receiving elements are electrically connected with the lower circuit board. According to the photoelectric sensor, the structure that one transmitting end corresponds to one receiving end of a traditional photoelectric sensor is designed into the structure that one transmitting end corresponds to two receiving ends; wherein one receiving end is used for normal photoelectric induction of the photoelectric sensor, and the other receiving end is used for detecting and calibrating the state of the whole photoelectric sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of photoelectric sensors, and in particular to a photoelectric sensor. Background Art

[0002] A photoelectric sensor uses a photoelectric element as its detection element. It first converts changes in the measured quantity into changes in a light signal, which is then converted into an electrical signal using the photoelectric element. The principle is that when light is irradiated on an object, it is bombarded by a series of energetic photons. Electrons in the material absorb the photon energy, resulting in corresponding electrical effects such as changes in conductivity, electron emission, or the generation of an electromotive force.

[0003] Photoelectric sensors are widely used and have advantages such as fast response speed, high precision, high resolution, good reliability, small size, light weight, low power consumption, easy integration, and non-contact measurement. With the development of technology, photoelectric sensor technology has reached a very mature stage, and there are no obvious defects in its use. However, since photoelectric sensors are very sensitive components, when they are affected by external factors for a long time during use, their light paths will undergo slight changes, resulting in a decrease in the accuracy and resolution of the photoelectric sensors, affecting their use. However, because these changes are very small, conventional alarm systems sometimes cannot detect them and cannot determine the current changes of the photoelectric sensors, resulting in false alarms during use. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a photoelectric sensor, which solves the problem that the accuracy and resolution of the existing photoelectric sensor decrease after being affected by external factors, but the alarm system cannot detect the sensor failure.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a photoelectric sensor, comprising a fixing plate, an upper circuit board, and a lower circuit board, wherein the upper and lower ends of the fixing plate are connected to an upper mounting plate and a lower mounting plate, respectively, an upper housing and a lower housing are screwed into the upper mounting plate and the lower mounting plate, respectively, and the upper circuit board and the lower circuit board are mounted in the upper housing and the lower housing, respectively;

[0006] A light-emitting element and a plurality of first receiving elements are installed in the upper housing, and the light-emitting element and the plurality of first receiving elements are electrically connected to the upper circuit board;

[0007] A plurality of second receiving elements are installed in the lower housing, and the plurality of second receiving elements are electrically connected to the lower circuit board;

[0008] A refracting mirror is installed in the fixing plate and between the upper shell and the lower shell. An upper convex mirror and a lower convex mirror are respectively provided at the upper and lower ends of the refracting mirror.

[0009] Preferably, the upper circuit board and the lower circuit board are respectively connected with transmission wires and upper power lines and lower power lines.

[0010] Preferably, a plurality of the first receiving elements are distributed in a ring shape outside the light emitting element with the light emitting element as the center.

[0011] Preferably, protective glasses are provided on the upper shell and the lower shell respectively.

[0012] Preferably, a plurality of bolts are provided on the fixing plate.

[0013] Beneficial effects

[0014] The present invention provides a photoelectric sensor having the following beneficial effects:

[0015] 1. The traditional photoelectric sensor has only one transmitter and one receiver, and is designed to have one transmitter and two receivers. One receiver is used for normal photoelectric sensing, and the other receiver is used to detect and calibrate the status of the entire photoelectric sensor.

[0016] 2. The light-emitting element emits light to the center of the lower folding mirror. The upper convex mirror above the folding mirror reflects some of the light into the first receiving element, transmitting a feedback signal through the upper circuit board. Some of the light passes through the center of the upper and lower convex mirrors, refracted by the lower convex mirror, and then reaches the second receiving element, transmitting a feedback signal through the lower circuit board. If the photoelectric sensor is affected by external factors and the light emitted by the light-emitting element cannot align with the center of the upper and lower convex mirrors, the refracted light from the lower convex mirror will be significantly offset, causing the second receiving element to be unable to properly receive the light signal. At this time, the lower circuit board will feedback an abnormal signal, which can detect that the sensor is abnormal and needs to be replaced or repaired. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0018] Figure 2 It is a cross-sectional view of the upper housing of the present invention.

[0019] Figure 3 A cross-sectional view of the lower housing of the present invention

[0020] Figure 4 Schematic diagram of the distribution of the first receiving element and the light-emitting element of the present invention.

[0021] Figure 5 Schematic diagram of the distribution of the second receiving element of the present invention.

[0022] In the figure: 1. Upper mounting plate; 2. Fixing plate; 3. Bolt; 4. Refractive mirror; 5. Upper housing; 6. Lower mounting plate; 7. Protective mirror; 8. Upper circuit board; 9. First receiving element; 10. Light-emitting element; 11. Upper power cord; 12. Lower housing; 13. Second receiving element; 14. Lower circuit board; 15. Lower power cord; 16. Transmission wire; 17. Upper convex mirror; 18. Lower convex mirror. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-5 The present invention provides a technical solution: a photoelectric sensor, comprising a fixing plate 2, an upper circuit board 8 and a lower circuit board 14, wherein the upper and lower ends of the fixing plate 2 are respectively connected to an upper mounting plate 1 and a lower mounting plate 6, wherein an upper housing 5 and a lower housing 12 are respectively screwed into the upper mounting plate 1 and the lower mounting plate 6, and the upper circuit board 8 and the lower circuit board 14 are respectively installed in the upper housing 5 and the lower housing 12;

[0025] A light emitting element 10 and a plurality of first receiving elements 9 are installed in the upper housing 5 , and the light emitting element 10 and the plurality of first receiving elements 9 are electrically connected to the upper circuit board 8 ;

[0026] A plurality of second receiving elements 13 are installed in the lower housing 12 , and the plurality of second receiving elements 13 are electrically connected to the lower circuit board 14 ;

[0027] A folding mirror 4 is installed in the fixing plate 2 and between the upper shell 5 and the lower shell 12. An upper convex mirror 17 and a lower convex mirror 18 are respectively provided at the upper and lower ends of the folding mirror 4.

[0028] The refraction mirror 4 is a semi-transparent prism. When the light emitted by the light-emitting element 10 hits the refraction mirror 4, part of the light is reflected upward, while the other part passes through the bottom of the refraction mirror 4. The upper and lower surfaces of the refraction mirror 4 are designed to be convex structures. Only when the light emitted by the light-emitting element 10 hits the center line of the refraction mirror 4 and the upper convex mirror 17, the lower convex mirror 18 can refract the light downward normally.

[0029] The upper circuit board 8 and the lower circuit board 14 both use existing circuit board components, and their structures and functions belong to existing mature technologies, so there is no need to introduce their usage methods in detail.

[0030] Furthermore, the upper circuit board 8 and the lower circuit board 14 are connected to a transmission wire 16 and an upper power line 11 and a lower power line 15 respectively.

[0031] Furthermore, a plurality of the first receiving elements 9 are distributed in a ring shape outside the light emitting element 10 with the light emitting element 10 as the center.

[0032] Furthermore, protective glasses 7 are provided on the upper shell 5 and the lower shell 12 respectively.

[0033] Furthermore, a plurality of bolts 3 are provided on the fixing plate 2 .

[0034] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.

[0035] Example: During operation, light emitted by the light-emitting element 10 is reflected by the upper convex mirror 17 below. Part of the light is received by the first receiving element 9, and the upper circuit board 8 returns an output signal, allowing normal operation. Meanwhile, another portion of the light emitted downward passes through the center of the upper convex mirror 17 and the diopter 4, is refracted by the lower convex mirror 18, and is projected onto the second receiving element 13. The feedback signal is then transmitted through the lower circuit board 14. If the photoelectric sensor is affected by external factors and the light emitted by the light-emitting element 10 cannot align with the center of the upper convex mirror 17 and the diopter 4, the refracted light from the lower convex mirror 18 will be significantly offset, causing the second receiving element 13 to be unable to properly receive the light signal. At this time, the lower circuit board 14 will feedback an abnormal signal, thereby detecting the sensor abnormality.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A photoelectric sensor comprising a fixing plate (2), an upper circuit board (8) and a lower circuit board (14), characterized in that: The upper and lower ends of the fixing plate (2) are respectively connected to an upper mounting plate (1) and a lower mounting plate (6); an upper housing (5) and a lower housing (12) are respectively screwed into the upper mounting plate (1) and the lower mounting plate (6); and the upper circuit board (8) and the lower circuit board (14) are respectively mounted in the upper housing (5) and the lower housing (12); A light-emitting element (10) and a plurality of first receiving elements (9) are installed in the upper housing (5), and the light-emitting element (10) and the plurality of first receiving elements (9) are electrically connected to the upper circuit board (8); A plurality of second receiving elements (13) are installed in the lower housing (12), and the plurality of second receiving elements (13) are electrically connected to the lower circuit board (14); A folding mirror (4) is installed in the fixed plate (2) and between the upper shell (5) and the lower shell (12). An upper convex mirror (17) and a lower convex mirror (18) are respectively provided at the upper and lower ends of the folding mirror (4).

2. A photoelectric sensor according to claim 1, characterized in that: The upper circuit board (8) and the lower circuit board (14) are respectively connected with a transmission conductor (16), an upper power line (11), and a lower power line (15).

3. The photoelectric sensor according to claim 1, wherein: A plurality of the first receiving elements (9) are distributed in a ring shape outside the light-emitting element (10) with the light-emitting element (10) as the center.

4. The photoelectric sensor according to claim 1, wherein: The upper shell (5) and the lower shell (12) are respectively provided with protective mirrors (7).

5. The photoelectric sensor according to claim 1, wherein: A plurality of bolts (3) are provided on the fixing plate (2).

Images