Opposite emission type photoelectric switch

Abstract

The utility model belongs to the technical field of photoelectric switches, and discloses a correlation type photoelectric switch, which comprises a fixed base block and a shell cover, a photoelectric receiving plate and a receiving door are mounted in the shell cover, a structural sleeve is mounted in the fixed base block, an output door is mounted in the structural sleeve, and a detection rotating shaft is arranged at one end, deviating from the shell cover, of the output door. The structural sleeve comprises a hollow circular pipe, a fixing plate and a fixing ring, multiple sets of light sources are installed on the side, close to the receiving door, of the fixing plate, an output door and the detection rotating shaft are installed in the hollow circular pipe, and the receiving door is provided with a light door in the diameter direction of the section of the hollow circular pipe; according to the utility model, the structural design is compact and reasonable, the rotation condition can be counted and monitored by utilizing the rotation of the structure to shield or allow light to pass through, the rotation mechanism is convenient to control, and the unique receiving door and the output door are arranged, so that the precision can be greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photoelectric switch technical field, concretely is a kind of against the photoelectric switch of type. BACKGROUND

[0002] Photoelectric switch is the abbreviation of photoelectric proximity switch, it is by synchronous loop circuit by the blocking or reflection of light beam of the detected object, to detect the presence or absence of object.The object is not limited to metal, all objects that can reflect light can be detected.Photoelectric switch is usually composed of light source and photoelectric detector such as photoresistor, photodiode or phototransistor.The working principle of photoelectric switch is as follows: when the object enters the path of light beam, it will block the light, so that the photoelectric detector cannot receive the light signal.The system will detect the change and switch the output state, so as to realize the function of switch, and some photoelectric switches are made by photoelectric effect.

[0003] Common photoelectric switch is used for industrial production counting, position determination, etc., which can determine the position of product on transmission mechanism, facilitate automatic production, and also can be used for counting, and the running condition of product or device can be obtained according to the number of blocking.The counting type photoelectric switch is often used for rotating wheel, which can record the number of rotating disc rotation, and can be used in automatic control, robot, displacement monitoring control and other fields.

[0004] The existing counting photoelectric switch generally adopts strip type, the strip is sleeved on the rotating wheel, and holes are punched on the strip, the light source is arranged on one side of the strip, and the receiving device is arranged on the other side, the light is used to pass through the holes to realize counting, the displacement or the rotating amount of rotating disc can be calculated, the precision is very high by using the strip, but the mechanical property of the strip is very poor, if the rotating speed of rotating wheel is uneven or frequently brakes, starts and stops, the strip is extremely easy to break or deform.The traditional rotating disc type is used, the light source or receiver is arranged to rotate with the rotating wheel, which can avoid the damage of strip, but this method leads to low precision or high cost, if a single set of against structure is arranged, the error is close to 360°, if double sets of against structure are arranged, the error is close to 180°, a plurality of circumferentially symmetrical light doors are processed on the rotating disc to improve the precision, but when the required precision is too high, the processing difficulty of device is very large. UTILITY MODEL CONTENTS

[0005] (I) technical problem solved

[0006] In view of the defects of prior art, the utility model provides a kind of against the photoelectric switch of type, to solve the low precision of rotating disc type problem in the above background technology.

[0007] (II) technical scheme

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a through-beam photoelectric switch, comprising a fixed base block and a housing cover, wherein a photoelectric receiving plate and a receiving door are installed inside the housing cover, a structural sleeve is installed inside the fixed base block, an output door is installed inside the structural sleeve, and a detection shaft is provided at the end of the output door away from the housing cover, the detection shaft extending to the outside of the fixed base block.

[0009] Preferably, the fixing base block has a circular hole corresponding to the structural sleeve, and the side wall of the fixing base block has four sets of fixing holes.

[0010] Preferably, the structural sleeve includes a hollow round tube, a fixing plate, and a fixing ring. The hollow round tube is inserted into the round hole. A fixing ring is provided on the side of the hollow round tube near the receiving door. The fixing ring is fixedly connected to the receiving door by bolts. A fixing plate is provided on the side of the hollow round tube away from the receiving door. A pivot hole is opened in the center of the fixing plate. Multiple sets of light sources are installed on the side of the fixing plate near the receiving door.

[0011] Preferably, an output door and a detection shaft are installed inside the hollow cylindrical tube. The detection shaft passes through a shaft hole and is coaxially connected to the output door at one end, while the other end extends outward.

[0012] Preferably, the receiving gate has a light gate along the diameter direction of the hollow circular tube cross-section.

[0013] Preferably, the light gate is a set of strip-shaped notches or multiple sets of circumferentially symmetrical strip-shaped notches.

[0014] Preferably, the output gate has a detection gate corresponding to a set of optical gates.

[0015] Preferably, the output gate is further provided with a correction gate, and the angle between the detection gate and the correction gate is half of the angle between the two adjacent optical gates plus a positive integer multiple.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a through-beam photoelectric switch, which has the following advantages:

[0018] 1. This through-beam photoelectric switch is equipped with a light source and a photoelectric receiving board. By rotating the structure to block or allow light to pass through, it can count and monitor the rotation, which facilitates the control of the rotation mechanism. It also features a unique receiving gate and output gate, which can greatly improve accuracy.

[0019] 2. Equipped with a light source and a photoelectric receiving board, the rotation causes the photoelectric receiving board to receive light signals. The number of rotations of the required rotating wheel can be calculated using intermittent signal counting, which facilitates better control of the rotating mechanism.

[0020] 3. It is equipped with a receiving gate and an output gate. The detection gate allows light to pass through and triggers counting detection. The correction gate, which is at a specific angle to the detection gate, can improve the detection accuracy by 100%, which greatly reduces the precision processing requirements compared to traditional single-light gates. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is an exploded view of the overall structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the structural sleeve, receiving door, and output door of this utility model;

[0024] Figure 4 This is a schematic diagram of the receiving door and output door structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the receiving door and output door structure of this utility model.

[0026] In the diagram: 1. Fixed base block; 2. Shell cover; 3. Photoelectric receiving plate; 4. Receiving door; 5. Output door; 6. Detection shaft; 7. Structural sleeve; 8. Circular hole; 9. Fixing hole; 10. Hollow circular tube; 11. Fixing plate; 12. Fixing ring; 13. Shaft hole; 14. Light source; 15. Positioning hole; 16. Light gate; 17. Detection door; 18. Correction door. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-5 This utility model provides a technical solution:

[0029] A through-beam photoelectric switch includes a fixed base 1 and a housing 2. A photoelectric receiving plate 3 and a receiving door 4 are installed inside the housing 2. A structural sleeve 7 is installed inside the fixed base 1, and an output door 5 is installed inside the structural sleeve 7. A detection shaft 6 is provided at the end of the output door 5 facing away from the housing 2, extending to the outside of the fixed base 1. The outer end of the detection shaft 6 can be coaxially connected to a rotating mechanism. If space permits, a gear set or other mechanism can be used to change the angular velocity. The higher the multiple of the angular velocity of the detection shaft 6, the higher the accuracy. This device can detect and count the number of rotations of the rotating mechanism through the connection of 6, and can be used in fields such as rotation monitoring, robot displacement monitoring, and vehicle displacement monitoring.

[0030] Furthermore, the fixing base block 1 has a circular hole 8 corresponding to the structural sleeve 7, and four sets of fixing holes 9 are provided on the side wall of the fixing base block 1. The fixing holes 9 and the positioning holes 15 work together to firmly fix the structural sleeve 7 to the fixing base block 1 and its interior, and prevent it from loosening and moving coaxially.

[0031] Furthermore, the structural sleeve 7 includes a hollow circular tube 10, a fixing plate 11, and a fixing ring 12. The hollow circular tube 10 is inserted into the circular hole 8. A fixing ring 12 is provided on the side of the hollow circular tube 10 near the receiving door 4, and the fixing ring 12 is fixedly connected to the receiving door 4 by bolts. A fixing plate 11 is provided on the side of the hollow circular tube 10 away from the receiving door 4. A pivot hole 13 is opened in the center of the fixing plate 11. Multiple sets of light sources 14 are installed on the side of the fixing plate 11 near the receiving door 4. The light sources 14 can be LED light sources. The output door 5 rotates inside the hollow circular tube 10, and a limit mechanism can be set to prevent the output door 5 from shifting when rotating.

[0032] Furthermore, an output door 5 and a detection shaft 6 are installed inside the hollow cylindrical tube 10. The detection shaft 6 passes through the shaft hole 13, with one end coaxially connected to the output door 5, and the other end extending outward. If space is limited, the detection shaft 6 can be directly connected to the rotating mechanism, in which case the detection shaft 6 will drive the output door 5 to rotate together, achieving the effect of light source rotation. If space is large, gear sets or similar devices can be used to change the rotational angular velocity of the detection shaft 6. If the rotational angular velocity of the detection shaft 6 is N times that of the original mechanism, the accuracy is improved by N times compared to a device with the same angular velocity.

[0033] Furthermore, the receiving gate 4 is provided with an optical gate 16 along the diameter direction of the hollow circular tube 10. Compared with a traditional optical gate, the optical gate 16 has a similar function, but the optical gate 16 is a fixed structure and does not rotate with the rotating mechanism. In the traditional method, the optical gate rotates to achieve the on / off of the optical signal. The optical gate 16 on the receiving gate 4 only receives the optical signal at a fixed point. The number of optical gates 16 determines the number of signals in each signal group. That is, when the number of optical signals received is the same as the number of optical gates 16, the number of signals increases by one for each rotation of the detection shaft 6.

[0034] Furthermore, the light gate 16 can be a set of strip-shaped notches or multiple sets of circumferentially symmetrical strip-shaped notches. If multiple sets of light gates 16 are provided, they must be circumferentially symmetrical, that is, the included angle between two connected sets of light gates 16 must be equal, and the entire circle is evenly divided by the light gates 16.

[0035] Furthermore, the output gate 5 is provided with a detection gate 17 corresponding to a set of light gates 16. The detection gate 17 rotates together with the output gate 5. When the detection gate 17 rotates to the light gate 16, the light path is opened, and the photoelectric receiving board 3 receives the light signal and starts counting.

[0036] Furthermore, a correction gate 18 is also provided on the output gate 5, and the included angle between the detection gate 17 and the correction gate 18 is half the included angle of the two adjacent light gates 16 plus a positive integer multiple. Taking the included angle of the two sets of light gates as A, and the included angle of the detection gate 17 and the correction gate 18 as B, then B = A(2n+1) / 2, where n is a positive integer. With this setting, when the detection gate 17 rotates to the light gate 16, the correction gate 18 will be placed in the middle of the two sets of light gates 16. If the rotation speed is uneven or there is an emergency stop, the included angle of the contact window between the detection gate 17 and the correction gate 18 and 16 will only be A / 2, which can improve the monitoring accuracy by 100%. If a traditional three-light gate is used, the detection accuracy error of the device is about 120°. Adding 18 as a correction, the accuracy error is about 60°. Similarly, the accuracy of the four-light gate is improved from the original 90° to 45°.

[0037] Working principle: When using this device, the detection shaft 6 can be connected to the rotating mechanism to be detected, so that the detection shaft 6 can rotate to detect its rotation and count it. The displacement can be calculated based on the number of rotations. When the detection shaft 6 rotates, the output gate 5 rotates together with the detection shaft 6. When the detection gate 17 on the output gate 5 rotates to coincide with a set of optical gates 16 on the receiving gate 4, the light passes through the gap and hits the photoelectric receiving plate 3 located behind the receiving gate 4. The photoelectric receiving plate 3 receives the light signal and increments the count by one. At the same time, the rotation of the correction gate 18 also causes the light signal count to increment by one. If this is repeated, the number of rotations is the number of signals received by the photoelectric receiving plate 3 divided by twice the number of optical gates 16. When the rotation speed is uneven or there is an emergency stop, the rotation points of the detection gate 17 and the correction gate 18 are all placed between the optical gates 16. Because the angle between the detection gate 17 and the correction gate 18 results in the window angle being half the angle between the two optical gates 16, the accuracy is doubled.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A through-beam photoelectric switch, comprising a fixed base (1) and a housing (2), characterized in that: The cover (2) is equipped with a photoelectric receiving plate (3) and a receiving door (4). The fixed base (1) is equipped with a structural sleeve (7). The structural sleeve (7) is equipped with an output door (5). The output door (5) is provided with a detection shaft (6) at one end away from the cover (2). The detection shaft (6) extends to the outside of the fixed base (1).

2. The through-beam photoelectric switch according to claim 1, characterized in that: The fixed base block (1) has a circular hole (8) corresponding to the structural sleeve (7) inside, and four sets of fixing holes (9) are opened on the side wall of the fixed base block (1).

3. A through-beam photoelectric switch according to claim 2, characterized in that: The structural sleeve (7) includes a hollow round tube (10), a fixing plate (11) and a fixing ring (12). The hollow round tube (10) is inserted into the round hole (8). The hollow round tube (10) is provided with a fixing ring (12) on the side near the receiving door (4). The fixing ring (12) is fixedly connected to the receiving door (4) by bolts. The hollow round tube (10) is provided with a fixing plate (11) on the side away from the receiving door (4). The fixing plate (11) has a rotating shaft hole (13) in the center. Multiple light sources (14) are installed on the side of the fixing plate (11) near the receiving door (4).

4. A through-beam photoelectric switch according to claim 3, characterized in that: The hollow tube (10) is equipped with an output door (5) and a detection shaft (6). The detection shaft (6) passes through the shaft hole (13) and is coaxially connected to the output door (5) at one end, while the other end extends outward.

5. A through-beam photoelectric switch according to claim 3, characterized in that: The receiving door (4) is provided with a light gate (16) along the diameter direction of the cross section of the hollow circular tube (10).

6. A through-beam photoelectric switch according to claim 5, characterized in that: The light gate (16) is a set of strip-shaped notches or multiple sets of circumferentially symmetrical strip-shaped notches.

7. A through-beam photoelectric switch according to claim 5, characterized in that: The output gate (5) is provided with a detection gate (17) corresponding to a set of optical gates (16).

8. A through-beam photoelectric switch according to claim 7, characterized in that: The output gate (5) is also provided with a correction gate (18), and the angle between the detection gate (17) and the correction gate (18) is half of the angle between the two adjacent light gates (16) plus a positive integer multiple.

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