Multi-turn photoelectric angular displacement sensor capable of realizing zero reset in power-off state

Abstract

The utility model discloses a multi-turn photoelectric angular displacement sensor capable of realizing zero reset in a power-off state, which comprises a shell, a rotating shaft, a movable sleeve, a photosensitive element plate, a photosensitive element, a light source plate, a light source, an adjusting piece, an elastic reset assembly and a telescopic rod, the elastic reset assemblies are installed between the light source plate and the corresponding inner wall of the shell, the adjusting pieces penetrate through corresponding through holes of the shell and are connected with the light source plate, one end of each telescopic rod is installed on the light source plate, a plurality of reset holes are formed in the photosensitive element plate, and the other ends of the telescopic rods can be arranged in the reset holes respectively. The whole adjusting process can be completed in a power-off state, zero reset in the power-off state can be completed only by pressing and rotating the adjusting piece when needed, application requirements can be better met, and the calculated amount of a detection chip cannot be increased.

Description

Technical Field

[0001] The utility model relates to a multi-turn photoelectric angular displacement sensor, in particular to a multi-turn photoelectric angular displacement sensor capable of realizing zero position reset in a power-off state. Background Art

[0002] An angular displacement sensor (potentiometer) is a sensor that can detect the rotation angle of a shaft. It can convert the angular displacement of a machine (in some cases, it can also detect linear displacement, such as converting linear motion into rotational motion through a transmission device) into a resistance or voltage output that has a certain functional relationship with it. In addition to being used for angular displacement detection, it is also widely used to measure physical quantities such as pressure, acceleration, and liquid level.

[0003] A multi-turn angular displacement sensor is an angular displacement sensor that can detect continuous multi-turn angular displacement. Its detection principles mainly include magnetoelectric encoding and photoelectric encoding. The former realizes angular displacement detection based on the principle that the rotating magnetic steel generates a changing electromagnetic field which is detected by the magnetic induction element. The latter realizes angular displacement detection based on the relative rotation between the light source and the photosensitive element (such as photosensitive diodes, transistors, etc.). The latter is generally called a multi-turn photoelectric angular displacement sensor.

[0004] During the application process, the multi-turn photoelectric angular displacement sensor needs to detect the actual angle of the shaft in the current circle and the number of rotations, and the zero position needs to be confirmed before each use. Traditional multi-turn photoelectric angular displacement sensors usually use detection chips to memorize the angle after the last use and use it as the zero angle. This method can successfully realize angular displacement detection when the detection chip is not replaced, the detection chip does not fail, the sensor is not replaced, and the sensor shaft position remains unchanged. However, in actual use, the shaft is likely to change position before the next use. In this case, the detection chip needs to be re-calibrated for zero position. In order to ensure the correct zero position, it is often necessary to re-calibrate the zero position or redefine the zero position before use. This requires recalculating or redefining the zero position of the shaft when the power is on before it can be used normally. This will not only increase the calculation amount of the detection chip, but also fail to complete the zero position calibration or redefine the zero position when the power is off, which limits its application. Utility Model Content

[0005] The purpose of the utility model is to provide a multi-turn photoelectric angular displacement sensor which does not increase the calculation amount of the detection chip and can achieve zero position reset in the power-off state in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state comprises a housing, a rotating shaft, a movable sleeve, a photosensitive element board, a photosensitive element, a light source board and a light source, wherein the rotating shaft passes through a corresponding through hole on the housing and its inner end is connected to the movable sleeve, the movable sleeve is installed in the housing and can freely rotate relative to the housing following the rotating shaft, the first side surface of the opposite side surfaces of the photosensitive element board is installed on the movable sleeve, a plurality of the photosensitive elements are installed on the second side surface of the opposite side surfaces of the photosensitive element board, the light source board is installed in the housing, a plurality of the light sources corresponding to the plurality of the photosensitive elements one by one and close to each other are installed on the first side surface of the opposite side surfaces of the light source board, the multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state further comprises an adjusting member, an elastic reset assembly and a telescopic rod, a position of the circumferential inner wall of the housing corresponding to the outer circumference of the light source board An annular limiting groove is provided, the circumferential edge of the light source board is located in the annular limiting groove and can rotate freely and can move in the axial limiting position of the rotating shaft, a plurality of elastic reset components are installed between the second side surface of the opposite side surfaces of the light source board and the corresponding inner wall of the shell and make the light source board have an elastic force away from the photosensitive element board and the light source board can rotate freely relative to the elastic reset component, the adjusting member passes through the corresponding through hole of the shell, one end of the adjusting member is connected to the second side surface of the light source board, and the other end of the adjusting member is provided with a rotation driving structure, one end of the plurality of telescopic rods which are normally in an extended state and can automatically shorten when under pressure are installed on the first side surface of the light source board and correspond one-to-one to the plurality of light sources, a plurality of reset holes corresponding one-to-one to the plurality of photosensitive elements are provided on the second side surface of the photosensitive element board, and the other ends of the plurality of telescopic rods can be respectively placed in the plurality of reset holes.

[0008] Preferably, in order to realize reliable reset elasticity of the light source board while ensuring that the light source board is not disturbed by circumferential external force during and after the reset process to affect the detection accuracy, a circular groove is provided on the second side surface of the light source board, and the elastic reset assembly includes an outer tube, an inner rod, a reset spring, a first slider, a connecting rod and a second slider. The corresponding inner wall of the shell is provided with a plurality of linear slide grooves evenly arranged in the circumferential direction, and the length direction of the linear slide groove is the same as the radial direction of the circular groove. One end of the outer tube is connected to an end of the linear slide groove away from the circular groove, one end of the inner rod is placed in the outer tube and can slide relative to the axial direction, the reset spring is sleeved on the outer tube and the outside of the inner rod, and the other end of the inner rod is connected to the first slider. The outer tube, the inner rod, the reset spring and the first slider are all placed in the linear slide groove and the first slider can slide in the linear slide groove. The first slider is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the second slider. The second slider is placed in the circular groove and can slide in the circular direction and cannot be separated from the circular groove.

[0009] Preferably, in order to reliably realize the function that the second slider can slide in the circular direction and cannot separate from the circular groove, the circular groove is a "T"-shaped groove, the second slider is a "T"-shaped block, and the two side surfaces of the second slider placed in the circular groove are arc surfaces.

[0010] Preferably, in order to facilitate processing and assembly, a circular groove is provided in the middle of the second side surface of the light source panel, and an inwardly concave annular groove is provided on the circumferential groove wall near the bottom of the circular groove, and a circular pressure plate is installed above the middle of the bottom of the circular groove, and a circular boss protruding toward the bottom of the circular groove is provided in the middle of the circular pressure plate, and the circular groove, the annular groove, the circular pressure plate and the circular boss together form the circular ring slide groove.

[0011] Preferably, in order to prevent the light source board from moving too fast during the pressure movement and reset process, thereby causing swinging to affect the position of the light source (this influence may reduce the detection accuracy), the elastic reset assembly also includes a deceleration rod, the inner rod is provided with a coaxial inner rod blind hole, and the open end of the inner rod blind hole is located in the outer tube, the circumferential hole wall of the inner rod blind hole is provided with a spiral groove, the circumferential outer wall of the deceleration rod is provided with one or more outwardly protruding protrusions, the deceleration rod is placed in the inner rod blind hole, and the protrusion is placed in the spiral groove.

[0012] Preferably, in order to further improve the deceleration effect of the deceleration rod, the bottom of the spiral groove is provided with a plurality of ridges, the surface of the raised portion is spherical and is provided with a cross-shaped notch, and the plurality of ridges and the plurality of raised portions are respectively arranged in sequence on the spiral path of the spiral groove.

[0013] Preferably, in order to improve the resetting reliability of the light source board, the number of the elastic resetting components is four and they are evenly distributed in the circumferential direction.

[0014] Preferably, in order to achieve a more reliable zero-position reset adjustment function and facilitate processing and assembly, the adjusting part includes a pressing plate and a pressing column connected to each other, the pressing plate and the pressing column are perpendicular to each other, the circumferential outer wall of the pressing column is evenly provided with a plurality of convex positioning ridges, the length direction of the positioning ridges is the same as the axial direction of the pressing column, the rotating driving structure is a knife-changing groove arranged on the surface of the pressing plate, and a circular through hole on the outer shell for the adjusting part to pass through is provided with a circular positioning ring, and the hole wall of the central through hole of the positioning ring is evenly provided with a plurality of concave positioning grooves, and the plurality of positioning ridges are respectively placed in the plurality of positioning grooves, and one end of the pressing column is connected to the second side surface of the light source panel.

[0015] Preferably, in order to realize the reliable telescopic function of the telescopic rod and improve the reliability of zero-position reset and angular displacement detection of the sensor, the telescopic rod includes a sleeve, a push rod and a reset compression spring, one end of the sleeve is open and installed on the first side surface of the light source board, one end of the push rod is placed in the sleeve, and the other end of the push rod is placed outside the sleeve and located in the corresponding reset hole, the reset compression spring is placed in the sleeve and its two ends are respectively in contact with one end of the push rod and the first side surface of the light source board, the four telescopic rods are respectively close to the four light sources evenly distributed in the circumferential direction, and the four reset holes are respectively close to the four photosensitive elements evenly distributed in the circumferential direction.

[0016] Preferably, in order to avoid excessive friction between the push rod and the sleeve during extension and retraction and thus reduce operational reliability, a circular sliding plate is provided at one end of the push rod located inside the sleeve and the outer peripheral edge of the circular sliding plate contacts the circumferential inner wall of the sleeve, the circular sliding plate contacts the corresponding end of the reset compression spring, the outer diameter of the circular sliding plate is larger than the outer diameter of the push rod, the corresponding through hole wall on the sleeve for the push rod to pass through is provided with one or more limit grooves, the circumferential outer wall of the push rod is provided with one or more raised limit strips, the limit strips are placed in the corresponding limit grooves, and the end surface of the push rod located outside the sleeve is an arc surface.

[0017] The beneficial effects of the utility model are:

[0018] The utility model arranges an adjusting piece, an elastic reset component and a telescopic rod in a shell. When in use, the adjusting piece is pressed to drive the light source board to move in a direction close to the photosensitive element board. At this time, the telescopic rod is compressed to generate elastic force. Then the adjusting piece is rotated, and the telescopic rod rotates accordingly. When the telescopic rod corresponds to the reset hole, one end of the telescopic rod automatically enters the reset hole under the action of the elastic force. Neither the light source board nor the adjusting piece can continue to rotate. At this time, it indicates that the zero position is reset in place. Then the adjusting piece is released, and the light source board moves away from the photosensitive element board under the action of the elastic reset component until it is reset. The zero position reset adjustment is completed. The entire adjustment process can be completed in a power-off state, and it is only necessary to determine the corresponding position information between the light source and the photosensitive element in the zero position reset state as the zero position information in the sensor detection chip. There is no need to determine the zero position through the detection chip in the future. The zero position can be reset in the power-off state by pressing and rotating the adjusting piece when needed. This can better meet application requirements and will not increase the calculation amount of the detection chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of the multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to the utility model;

[0020] Figure 2 It is a partially cutaway stereoscopic view of the multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state according to the utility model, wherein the housing in the figure is a half-cutaway structure;

[0021] Figure 3 It is a stereoscopic view of the adjusting part of the multi-turn photoelectric angular displacement sensor capable of realizing zero position reset in the power-off state before being assembled;

[0022] Figure 4 It is a stereoscopic diagram of the light source board, light source and telescopic rod of the multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to the utility model;

[0023] Figure 5 It is a stereoscopic diagram of the elastic reset component of the multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to the utility model;

[0024] Figure 6 It is a partially cutaway stereoscopic view of the outer tube, inner rod and deceleration rod of the elastic reset assembly of the multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in the power-off state of the utility model, wherein the outer tube and the inner rod are half-cutaway structures;

[0025] Figure 7 It is a partially cutaway stereoscopic view of a telescopic rod of a multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state according to the utility model, wherein the sleeve is a half-cutaway structure. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] like Figure 1-Figure 7 As shown, the multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state of the utility model comprises a housing 1, a rotating shaft 4, a movable sleeve 17, a photosensitive element board 11, a photosensitive element 15, a light source board 5, a light source 12, an adjusting member (refer to the specific structure of the adjusting member described below), an elastic reset component 6 and a telescopic rod (refer to the specific structure of the telescopic rod described below), the rotating shaft 4 passes through a corresponding through hole on the housing 1 and its inner end is connected to the movable sleeve 17, the movable sleeve 17 is installed in the housing 1 and can rotate freely relative to the housing 1 following the rotating shaft 4, the first side surface of the opposite side surfaces of the photosensitive element board 11 is installed on the movable sleeve 17, a plurality of photosensitive elements 15 are installed on the second side surface of the opposite side surfaces of the photosensitive element board 11, the light source board 5 is installed in the housing 1, a plurality of light sources 12 corresponding to the plurality of photosensitive elements 15 and close to each other are installed on the first side surface of the opposite side surfaces of the light source board 5, and the circumferential inner wall of the housing 1 that is opposite to the outer circumference of the light source board 5 An annular limiting groove (not marked in the figure) is provided at the corresponding position, the circumferential edge of the light source board 5 is located in the annular limiting groove and can rotate freely and can move in the axial limit of the rotating shaft 4, a plurality of elastic reset components 6 are installed between the second side surface of the opposite side surfaces of the light source board 5 and the corresponding inner wall of the shell 1, and the light source board 5 has an elastic force away from the photosensitive element board 11 and the light source board 5 can rotate freely relative to the elastic reset component 11, the adjusting member passes through the corresponding through hole of the shell 1, one end of the adjusting member is connected to the second side surface of the light source board 5, and the other end of the adjusting member is provided with a rotation driving structure, one end of the plurality of telescopic rods which are normally in an extended state and can automatically shorten when under pressure are installed on the first side surface of the light source board 5 and correspond one-to-one with the plurality of light sources 12, a plurality of reset holes 16 corresponding one-to-one to the plurality of photosensitive elements 15 are provided on the second side surface of the photosensitive element board 11, and the other ends of the plurality of telescopic rods can be respectively placed in the plurality of reset holes 16.

[0028] like Figure 1-Figure 7 As shown, the utility model also discloses the following more optimized specific structures:

[0029] In order to ensure that the light source board 5 has reliable reset elasticity while ensuring that the light source board 5 is not disturbed by circumferential external forces during and after the reset process, thereby affecting the detection accuracy, a circular ring slide groove 8 is provided on the second side surface of the light source board 5, and the elastic reset component 6 includes an outer tube 65, an inner rod 63, a reset tension spring 64, a first slider 62, a connecting rod 61 and a second slider 60. The corresponding inner wall of the outer shell 1 is provided with a plurality of linear slide grooves 7 evenly arranged in the circumferential direction. The length direction of the linear slide groove 7 is the same as the radial direction of the circular ring slide groove 8, and one end of the outer tube 65 is aligned with the end of the linear slide groove 7 away from the circular ring slide groove 8. The inner rod 63 is connected, one end of the inner rod 63 is placed in the outer tube 65 and can slide relative to the axial direction, the return spring 64 is sleeved on the outer tube 65 and the inner rod 63, the other end of the inner rod 63 is connected to the first slider 62, the outer tube 65, the inner rod 63, the return spring 64 and the first slider 62 are all placed in the linear slide groove 7 and the first slider 62 can slide in the linear slide groove 7, the first slider 62 is rotationally connected to one end of the connecting rod 61, the other end of the connecting rod 61 is rotationally connected to the second slider 60, the second slider 60 is placed in the circular slide groove 8 and can slide in the circular direction and cannot be separated from the circular slide groove 8.

[0030] In order to reliably realize the function that the second slider 60 can slide in the circular direction and cannot separate from the circular groove 8, the circular groove 8 is a "T"-shaped groove, the second slider 60 is a "T"-shaped block, and the two side surfaces of the second slider 60 placed in the circular groove 8 are arc surfaces.

[0031] To facilitate processing and assembly, a circular groove (not marked in the figure) is provided in the middle of the second side surface of the light source panel 5, and an inwardly concave annular groove (not marked in the figure) is provided on the circumferential groove wall near the bottom of the circular groove. A circular pressure plate 10 is installed above the middle of the bottom of the circular groove, and a circular boss (not visible in the figure) is provided in the middle of the circular pressure plate 10, which protrudes toward the bottom of the circular groove. The circular groove, the annular groove, the circular pressure plate 10 and the circular boss together form a circular ring slide groove 8.

[0032] In order to prevent the light source board 5 from moving too fast during the pressure movement and reset process, causing the swing to affect the position of the light source 12 (this influence may reduce the detection accuracy), the elastic reset assembly 6 also includes a deceleration rod 68, the inner rod 63 is provided with a coaxial inner rod blind hole (not marked in the figure) and the open end of the inner rod blind hole is located in the outer tube 65, the circumferential hole wall of the inner rod blind hole is provided with a spiral groove 66, the circumferential outer wall of the deceleration rod 68 is provided with multiple (or one) outwardly protruding protrusions 69, the deceleration rod 68 is placed in the inner rod blind hole, and the protrusion 69 is placed in the spiral groove 66.

[0033] In order to further improve the deceleration effect of the deceleration rod 68, a plurality of ridges 67 are provided at the bottom of the spiral groove 66, and the surface of the raised portion 69 is spherical and is provided with a cross-shaped notch. The plurality of ridges 67 and the plurality of raised portions 69 are arranged in sequence on the spiral path of the spiral groove 66.

[0034] In order to improve the resetting reliability of the light source board 5 , there are four elastic resetting components 6 which are evenly distributed in the circumferential direction.

[0035] In order to achieve a more reliable zero-position reset adjustment function and facilitate processing and assembly, the adjusting part includes a pressing plate 2 and a pressing column 19 that are connected to each other. The pressing plate 2 and the pressing column 19 are perpendicular to each other. The circumferential outer wall of the pressing column 19 is evenly provided with a plurality of convex positioning ridges 20. The length direction of the positioning ridges 20 is the same as the axial direction of the pressing column 19. The rotating driving structure is a knife groove 3 (a cross groove in the figure) provided on the surface of the pressing plate 2. A circular positioning ring 9 is provided in the circular through hole on the outer shell 1 for the adjusting part to pass through. The hole wall of the central through hole 21 of the positioning ring 9 is evenly provided with a plurality of concave positioning grooves 22. The plurality of positioning ridges 20 are respectively placed in the plurality of positioning grooves 22. One end of the pressing column 19 is connected to the second side surface of the light source panel 5.

[0036] In order to realize the reliable telescopic function of the telescopic rod and improve the reliability of the zero position reset and angular displacement detection of the sensor, the telescopic rod includes a sleeve 13, a push rod 14 and a reset spring 23. One end of the sleeve 13 is open and installed on the first side surface of the light source board 5, one end of the push rod 14 is placed in the sleeve 13, and the other end of the push rod 14 is placed outside the sleeve 13 and located in the corresponding reset hole 16. The reset spring 23 is placed in the sleeve 13 and its two ends are respectively in contact with one end of the push rod 14 and the first side surface of the light source board 5. The four telescopic rods are respectively close to four light sources 12 evenly distributed in the circumferential direction, and the four reset holes 16 are respectively close to four photosensitive elements 15 evenly distributed in the circumferential direction.

[0037] In order to avoid excessive friction between the push rod 14 and the sleeve 13 during the extension and retraction process, thereby reducing the operational reliability, a circular sliding plate 24 is provided at one end of the push rod 14 located inside the sleeve 13, and the outer peripheral edge of the circular sliding plate 24 contacts the circumferential inner wall of the sleeve 13, and the circular sliding plate 24 contacts the corresponding end of the reset compression spring 23. The outer diameter of the circular sliding plate 24 is larger than the outer diameter of the push rod 14. The corresponding through hole wall on the sleeve 13 for the push rod 14 to pass through is provided with one or more limit grooves (not marked in the figure), and the circumferential outer wall of the push rod 14 is provided with one or more raised limit strips 25, which are placed in the corresponding limit grooves, and the end surface of the push rod 14 located outside the sleeve 13 is an arc surface.

[0038] Figure 2Also shown are a plurality of balls 18 disposed on the circumferential edge of the movable sleeve 17 to achieve relative rotation of the movable sleeve 17 relative to the housing 1, which is a conventional structure.

[0039] like Figure 1-Figure 7 As shown, when used, first perform zero-position reset adjustment in the power-off state, connect the change cutter (not shown in the figure) to the change cutter slot 3 on the pressing plate 2 of the adjusting member and apply pressure, so that the pressing column 19 drives the light source board 5 to move in the direction close to the photosensitive element board 11. After moving into place, the rotating change cutter drives the pressing plate 2 to rotate. If rotation cannot be achieved, it means that the sensor is already in zero position. Release the change cutter. Under the elastic tension of the reset tension spring 64, the first slider 62 moves in the direction close to the outer tube 65, and the inner rod 63 moves adaptively into the outer tube 65. The first slider 62 drives the light source board 5 and the adjusting member. The joint moves in the direction away from the photosensitive element board 11 until the reset is completed; if rotation can be achieved, the knife is rotated continuously until one end of the top rod 14 of the four telescopic rods enters the four reset holes 16 respectively and can no longer rotate. At this time, the sensor is in zero position, and then the knife is released. Under the elastic tension of the reset spring 64, the first slider 62 moves in the direction close to the outer tube 65, and the inner rod 63 adaptively moves into the outer tube 65. The first slider 62 drives the light source board 5 and the adjustment member to move in the direction away from the photosensitive element board 11 until the reset is completed, completing the zero position reset adjustment process.

[0040] After the zero-position reset adjustment is completed, the rotating shaft 4 is connected to the rotating drive member of the device to be detected, and the rotating shaft 4 is driven to rotate by the rotating drive member. The rotating shaft 4 drives the movable sleeve 17, the photosensitive element board 11 and the photosensitive element 15 to rotate synchronously. The photosensitive element 15 sends the detected information of the relative position change between the light source 12 to the detection chip (not shown in the figure, it can be placed in the housing 1 or in other processors), and the detection chip calculates the change signal to obtain the rotation angle change data to realize the angular displacement detection function.

[0041] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state, comprising a housing, a rotating shaft, a movable sleeve, a photosensitive element board, a photosensitive element, a light source board and a light source, wherein the rotating shaft passes through a corresponding through hole on the housing and its inner end is connected to the movable sleeve, the movable sleeve is installed in the housing and can rotate freely relative to the housing following the rotating shaft, a first side surface of the opposite side surfaces of the photosensitive element board is installed on the movable sleeve, a plurality of the photosensitive elements are installed on a second side surface of the opposite side surfaces of the photosensitive element board, the light source board is installed in the housing, and a plurality of the light sources corresponding to the plurality of the photosensitive elements one by one and close to each other are installed on the first side surface of the opposite side surfaces of the light source board, Features: The multi-turn photoelectric angular displacement sensor capable of achieving zero-position reset in a power-off state further comprises an adjusting member, an elastic reset assembly and a telescopic rod. An annular limiting groove is provided in the circumferential inner wall of the housing at a position corresponding to the outer circumference of the light source board. The circumferential edge of the light source board is located in the annular limiting groove and can rotate freely and can move in the axial limit of the rotating shaft. A plurality of the elastic reset assemblies are installed between the second side surface of the opposite side surfaces of the light source board and the corresponding inner wall of the housing so that the light source board has an elastic force away from the photosensitive element board and the light source board can rotate freely relative to the elastic reset assembly. The adjusting member passes through the corresponding through hole of the housing. One end of the adjusting member is connected to the second side surface of the light source board. The other end of the adjusting member is provided with a rotation driving structure. One end of the plurality of telescopic rods which are normally in an extended state and can automatically shorten when under pressure is installed on the first side surface of the light source board and correspond to the plurality of light sources one by one. A plurality of reset holes corresponding to the plurality of photosensitive elements are provided on the second side surface of the photosensitive element board. The other ends of the plurality of telescopic rods can be placed in the plurality of reset holes respectively.

2. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to claim 1, Features: The first sliding groove is connected with the first sliding groove by the first and second sliding grooves, and the first sliding groove is connected with the first and second sliding grooves by the first and second sliding grooves respectively.

3. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to claim 2, Features: The annular slide groove is a "T"-shaped groove, the second sliding block is a "T"-shaped block, and the two side surfaces of the part of the second sliding block placed in the annular slide groove are arc surfaces.

4. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to claim 3, Features: A circular groove is provided in the middle of the second side surface of the light source plate, and an inwardly concave annular groove is provided on the circumferential groove wall near the bottom of the circular groove. A circular pressure plate is installed above the middle of the bottom of the circular groove, and a circular boss protruding toward the bottom of the circular groove is provided in the middle of the circular pressure plate. The circular groove, the annular groove, the circular pressure plate and the circular boss together form the circular ring slide groove.

5. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to any one of claims 2 to 4, Features: The elastic reset assembly also includes a deceleration rod, the inner rod is provided with a coaxial inner rod blind hole and the open end of the inner rod blind hole is located in the outer tube, the circumferential hole wall of the inner rod blind hole is provided with a spiral groove, the circumferential outer wall of the deceleration rod is provided with one or more outwardly protruding protrusions, the deceleration rod is placed in the inner rod blind hole, and the protrusion is placed in the spiral groove.

6. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to claim 5, Features: The bottom of the spiral groove is provided with a plurality of ridges, the surface of the raised portion is a spherical surface and is provided with a cross-shaped notch, and the plurality of ridges and the plurality of raised portions are arranged in sequence on the spiral path of the spiral groove.

7. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to any one of claims 1 to 4, Features: There are four elastic reset components which are evenly distributed in the circumferential direction.

8. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to any one of claims 1 to 4, Features: The adjusting member includes a pressing plate and a pressing column connected to each other, the pressing plate and the pressing column are perpendicular to each other, the circumferential outer wall of the pressing column is evenly provided with a plurality of convex positioning ridges, the length direction of the positioning ridges is the same as the axial direction of the pressing column, the rotating driving structure is a knife-changing groove arranged on the surface of the pressing plate, a circular through hole on the outer shell for the adjusting member to pass through is provided with a circular positioning ring, the hole wall of the central through hole of the positioning ring is evenly provided with a plurality of concave positioning grooves, the plurality of positioning ridges are respectively placed in the plurality of positioning grooves, and one end of the pressing column is connected to the second side surface of the light source panel.

9. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to any one of claims 1 to 4, Features: The telescopic rod includes a sleeve, a push rod and a reset spring, one end of the sleeve is open and installed on the first side surface of the light source board, one end of the push rod is placed in the sleeve, and the other end of the push rod is placed outside the sleeve and located in the corresponding reset hole, the reset spring is placed in the sleeve and its two ends are respectively in contact with one end of the push rod and the first side surface of the light source board, the four telescopic rods are respectively close to the four light sources evenly distributed in the circumferential direction, and the four reset holes are respectively close to the four photosensitive elements evenly distributed in the circumferential direction.

10. The multi-turn photoelectric angular displacement sensor capable of achieving zero position reset in a power-off state according to claim 9, Features: A circular sliding plate is provided at one end of the push rod located in the sleeve, and the outer peripheral edge of the circular sliding plate contacts the circumferential inner wall of the sleeve, the circular sliding plate contacts the corresponding end of the reset compression spring, the outer diameter of the circular sliding plate is larger than the outer diameter of the push rod, and one or more limiting grooves are provided on the corresponding through hole wall of the sleeve for the push rod to pass through, and one or more raised limiting strips are provided on the circumferential outer wall of the push rod, and the limiting strips are placed in the corresponding limiting grooves, and the end surface of the push rod located outside the sleeve is an arc surface.

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