Light curtain sensor

Abstract

The utility model relates to a light curtain sensor and relates to the technical field of sensors, the light curtain sensor comprises a shell, a circuit assembly arranged in the shell and used for emitting light or receiving light, and a lens assembly arranged in the shell and located on the circuit assembly, and the lens assembly comprises a frame body arranged on the circuit assembly; the multiple sets of lens pieces are arranged on the frame body at intervals; and the first self-locking piece is arranged on the lens piece and is used for detachably locking the lens piece on the frame body. According to the invention, the frame body is arranged on the circuit assembly, then the plurality of lens pieces are clamped and mounted on the fixing frame in sequence, and the lens pieces are detachably mounted on the frame body through the first self-locking pieces, so that the circuit assembly and the lens assembly form a whole and are mounted in the shell in a sealed manner; and the installation or maintenance flexibility of the light curtain sensor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sensors, and in particular to light curtain sensors. Background Art

[0002] With the rapid development of industrial automation, light curtain sensors are widely used in the machining industry as an important safety protection device. They can effectively prevent safety accidents caused by workers accidentally entering dangerous areas.

[0003] A Chinese patent currently published with the publication number CN221784487U discloses a light curtain sensor, in which a circuit assembly is installed in a grating tube, a lens assembly is installed on the circuit assembly, the grating tube is sealed tightly against the grating tube window to facilitate light transmission, and end caps are installed at both ends of the grating tube to seal the two ends of the grating tube, ultimately achieving good waterproofness of the light curtain sensor.

[0004] The lens assembly is an integrated structure consisting of a bracket and a lens, so that the position of the lens is fixed. In order to ensure that each group of light emitters or light receivers has good anti-interference ability, the position of each group of lenses needs to be adjusted during installation. At the same time, when a single lens position needs to be repaired or replaced, the entire lens can only be replaced, thereby reducing the flexibility of the light curtain sensor. Utility Model Content

[0005] In order to improve the installation or maintenance flexibility of a light curtain sensor, the present application provides a light curtain sensor.

[0006] The light curtain sensor provided in this application adopts the following technical solutions:

[0007] A light curtain sensor includes a housing, a circuit assembly disposed in the housing and configured to emit or receive light, and a lens assembly disposed in the housing and positioned on the circuit assembly, the lens assembly comprising:

[0008] a frame, the frame being disposed on the circuit assembly;

[0009] Lens components, with multiple groups of lens components spaced apart and arranged on the frame;

[0010] A first self-locking member is provided on the lens member and is used to detachably lock the lens member on the frame.

[0011] By adopting the above technical solution, the frame is set on the circuit assembly, and then multiple lens components are snap-fitted and installed on the fixed frame in turn. The lens components are detachably installed on the frame through the first self-locking component, so that the circuit assembly and the lens assembly are formed into a whole and sealed in the shell, thereby improving the installation or maintenance flexibility of the light curtain sensor.

[0012] Furthermore, the lens element includes:

[0013] A mounting plate, the mounting plate being clamped and mounted on the frame;

[0014] A lens body, the lens body being disposed on the mounting plate and used to process light from the circuit assembly;

[0015] A positioning rod is arranged on the mounting plate and is engaged with the frame body for positioning.

[0016] By adopting the above technical solution, the lens body is fixedly mounted on the mounting plate, and the mounting plate is positioned by the positioning rod when it is clamped and mounted on the frame. The multiple groups of mounting plates are independent of each other, which facilitates fine-tuning the position of a single group of lens bodies and facilitates subsequent maintenance or replacement of the single group of lens bodies.

[0017] Furthermore, a locking hole is provided on the frame, and the first self-locking member includes:

[0018] A deformation block, which is arranged on the mounting plate and can be elastically bent and deformed;

[0019] The limit block is arranged on the side wall of the deformation block away from the mounting plate. When the limit block is pressed against the side wall of the locking hole, the deformation block is pushed to bend and deform. After the limit block passes through the locking hole, the deformation block recovers its deformation and presses against the side of the frame away from the mounting plate.

[0020] By adopting the above technical solution, when the deformation block is inserted into the locking hole, the side wall of the locking hole is pressed against the limit block, thereby causing the deformation block to deform. When the limit block completely passes through the locking hole, the deformation block recovers and the limit block prevents the mounting plate from moving back.

[0021] Furthermore, the side of the limit block away from the mounting plate and away from the deformation block is set on an inclined surface, and the locking hole is provided with a guide surface that cooperates with the inclined surface. When the limit block enters the locking hole, the inclined surface and the guide surface slide and abut against each other and push the deformation block to deform.

[0022] By adopting the above technical solution, when the limit block just enters the locking hole, the inclined surface and the guide surface slide and abut against each other, causing the deformation block to gradually deform, thereby improving the installation convenience of the mounting plate.

[0023] Furthermore, the frame includes:

[0024] A fixing frame, which is arranged on the circuit assembly and is used to support and fix the lens component;

[0025] A support rod, the support rod being arranged on the fixing frame and pressed against the circuit assembly;

[0026] Second self-locking parts, multiple groups of second self-locking parts are spaced apart and arranged on opposite ends of the fixing frame, and the second self-locking parts cooperate with the support rods to lock the fixing frame on the circuit assembly.

[0027] By adopting the above technical solution, when the fixing plate is installed on the circuit assembly, the second self-locking member and the support rod respectively press and fix the opposite ends of the circuit assembly, thereby fixing the fixing plate on the circuit assembly.

[0028] Furthermore, multiple groups of frames are arranged at intervals on the circuit component, a dovetail groove is provided on one end of the fixing frame, and a dovetail block is provided on the other end of the fixing frame to engage with the dovetail groove on the adjacent fixing frame, and the length direction of the dovetail groove is the same as the axis direction of the support rod.

[0029] By adopting the above technical solution, the dovetail block on the fixing frame is inserted into the dovetail groove of the adjacent fixing frame, thereby improving the connection strength of the adjacent fixing frames.

[0030] Furthermore, a plurality of groups of apertures for concentrating light are arranged at intervals on one side of the fixing frame close to the circuit assembly. The apertures are trumpet-shaped and their diameters decrease as they get closer to the circuit assembly.

[0031] By adopting the above technical solution, the aperture concentrates the light, thereby improving the anti-interference ability of the light curtain sensor.

[0032] Furthermore, the housing includes:

[0033] A grating tube, which is hollow inside and is used to fix the circuit assembly and the lens assembly. A window is opened at one end of the grating tube near the lens body to facilitate the passage of light;

[0034] A window piece, the window piece is sealed on the window and allows light to pass through;

[0035] End caps, wherein two sets of end caps are provided and are respectively located at opposite ends of the grating tube;

[0036] A waterproof strip is provided between the end cover and the grating tube and is used to improve the waterproof sealing between the grating tube and the end cover.

[0037] By adopting the above technical solution, the circuit component and lens component assembled into an integral whole are fixedly installed in the grating tube, and the window piece seals the window, thereby ensuring that light passes through while preventing debris from entering the grating tube. At the same time, the waterproof strip is fixedly installed between the end cover and the grating tube and the end cover is fixed on the grating tube, thereby improving the waterproof sealing performance of the shell.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] The fixing frame is placed on the circuit assembly through the joint action of the support rod and the second self-locking part, and then multiple mounting plates are positioned in turn by the positioning rod and then clamped and installed on the fixing frame. The lens component is detachably installed on the fixing frame through the first self-locking part, so that the circuit assembly and the lens assembly are formed into a whole and sealed in the shell, thereby improving the installation or maintenance flexibility of the light curtain sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the light curtain sensor of this application;

[0041] Figure 2 This is a schematic diagram of the explosion structure of the light curtain sensor of this application;

[0042] Figure 3 This is a schematic structural diagram of the perspective mirror and the first self-locking member of the present application;

[0043] Figure 4 It is a schematic diagram of the frame structure of this application.

[0044] Figure numerals: 1. Shell; 11. Grating tube; 12. Window piece; 13. End cover; 14. Waterproof strip; 2. Circuit assembly; 3. Lens assembly; 4. Frame; 41. Fixing frame; 411. Locking hole; 412. Guide surface; 413. Dovetail groove; 414. Dovetail block; 42. Support rod; 43. Second self-locking part; 5. Lens part; 51. Mounting plate; 52. Lens body; 53. Positioning rod; 6. First self-locking part; 61. Deformation block; 62. Limit block; 621. Inclined surface; 7. Aperture. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-4 This application is described in further detail.

[0046] The embodiments of the present application disclose a light curtain sensor.

[0047] Reference Figure 1 and Figure 2 The light curtain sensor includes a housing 1, a circuit component 2 arranged in the housing 1 and used for emitting or receiving light, and a lens component 3 arranged in the housing 1 and located on the circuit component 2.

[0048] Reference Figure 2Since the light curtain sensor is composed of a group of light-emitting ends and receiving ends, wherein the structures of the light-emitting ends and the receiving ends are the same, and only the light emitters and receivers in the circuit component 2 are different, the following embodiments are explained using the light curtain sensor of the light-emitting end; the circuit component 2 includes a circuit board and a light emitter, wherein the circuit board is a long strip structure, and multiple groups of light emitters are provided, and the multiple groups of light emitters are installed on the circuit board at intervals, and the circuit board is used to power the multiple groups of light emitters and control the light emission of the light emitters to output light for detection.

[0049] Reference Figure 2 and Figure 3 The lens assembly 3 includes a frame 4, a lens component 5 and a first self-locking component 6. The frame 4 is arranged on the circuit assembly 2. The lens component 5 is provided in multiple groups. The multiple groups of lens components 5 are arranged at intervals on the frame 4. The first self-locking component 6 is arranged on the lens component 5. The first self-locking component 6 is used to lock the lens component 5 on the frame 4.

[0050] Reference Figure 2 and Figure 3 The lens component 5 includes a mounting plate 51, a lens body 52 and a positioning rod 53. The mounting plate 51 is snap-fitted to the frame 4, and the lens body 52 is fixedly mounted on the mounting plate 51, so that the light generated by the circuit component 2 enters the lens body 52, and the direction of the light is adjusted by the lens body 52, thereby reducing the interference of the external environment on the light; the positioning rod 53 is fixedly mounted on one end of the mounting plate 51 close to the frame 4, and the mounting plate 51 is snap-fitted and positioned with the frame 4 when installed, thereby improving the installation accuracy of the lens body 52; the multiple groups of mounting plates 51 are independent of each other, which is convenient for fine-tuning the position of a single group of lens bodies 52, and at the same time convenient for subsequent repair or replacement of the single group of lens bodies 52.

[0051] Reference Figure 3 and Figure 4A locking hole 411 is provided on the frame 4, and the first self-locking member 6 includes a deformation block 61 and a limit block 62. The deformation block 61 is a long strip structure, and the deformation block 61 is fixedly mounted on the lower surface of the mounting plate 51. The deformation block 61 can be elastically bent to make the deformation block 61 bend at a certain angle; the limit block 62 is fixedly mounted on the side wall of the deformation block 61 away from the mounting plate 51. When the limit block 62 passes through the locking hole 411, the limit block 62 and the side wall of the locking hole 411 are pressed against each other, thereby pushing the deformation Block 61 bends and deforms; after the limit block 62 passes through the locking hole 411, the side wall of the locking hole 411 no longer presses against the limit block 62, so that the deformation block 61 recovers its deformation, and at the same time, the end face of the limit block 62 close to the mounting plate 51 presses against the frame 4, thereby preventing the limit block 62 from moving toward the end away from the frame 4; when the lens body 52 needs to be replaced, it is only necessary to apply external force to the deformation block 61 to deform the deformation block 61, and the first self-locking member 6 can be removed from the locking hole 411.

[0052] Reference Figure 3 and Figure 4 When the locking plate 411 is unlocked, the locking plate 411 is unlocked, and the locking plate 411 is unlocked, so that the locking plate 411 is unlocked.

[0053] Reference Figure 2 、 Figure 3 and Figure 4The frame 4 includes a fixing frame 41, a support rod 42 and a second self-locking member 43. The fixing frame 41 is fixedly arranged on the circuit assembly 2, and the fixing frame 41 is used to support and fix the lens member 5. The support rod 42 is fixedly mounted on the lower surface of the fixing frame 41, and the support rod 42 is pressed against the circuit assembly 2 to prevent the fixing frame 41 from continuing to slide toward the direction of the circuit assembly 2; the second self-locking member 43 is fixedly mounted on the lower surface of the fixing frame 41, and the second self-locking member 43 is provided with multiple groups, and multiple groups of second self-locking members 43 are installed at intervals on the lower surface of the fixing frame 41. A fixing groove that cooperates with the second self-locking member 43 is fixed on the circuit assembly 2. The structural principle of the second self-locking member 43 is the same as that of the first self-locking member 6. The second self-locking member 43 and the support rod 42 cooperate with each other to tightly fix the opposite ends of the circuit assembly 2, and finally the fixing frame 41 is fixedly mounted on the circuit assembly 2.

[0054] Reference Figure 2 and Figure 4 , multiple groups of frames 4 are arranged at intervals on the circuit component 2, and a dovetail groove 413 is provided on one end of the fixing frame 41 in the length direction, and a dovetail block 414 is fixedly installed at the other end of the fixing frame 41 in the length direction, which is engaged with the dovetail groove 413 on the adjacent fixing frame 41, and the length direction of the dovetail groove 413 is the same as the axial direction of the support rod 42; when installed, it moves in the direction close to the circuit component 2, so that the dovetail block 414 enters the dovetail groove 413, and at the same time the second self-locking part 43 enters the fixing groove, and finally the support rod 42 is pressed against the circuit component 2, and the dovetail block 414 cooperates with the adjacent dovetail groove 413 to fix the adjacent frames 4 to each other, so that the circuit component 2 and the multiple groups of lens components 3 are connected into a whole.

[0055] Reference Figure 2 and Figure 4 On the side of the fixing frame 41 close to the circuit component 2, multiple groups of apertures 7 are fixedly installed at intervals. The apertures 7 are trumpet-shaped and the diameter becomes smaller as they are closer to the circuit component 2. The apertures 7 are used to concentrate the light emitted by the light emitter, thereby improving the anti-interference ability of the light curtain sensor.

[0056] Reference Figure 1 and Figure 2The housing 1 includes a grating tube 11, a window piece 12, an end cover 13 and a waterproof strip 14. The grating tube 11 is made of aluminum alloy and is hollow inside. The grating tube 11 is used to fix the circuit assembly 2 and the lens assembly 3. A window for light to pass through is opened on one end of the grating tube 11 close to the lens body 52; the window piece 12 is sealed and fixedly installed at the window of the grating tube 11, and the window piece 12 allows light to pass through; two groups of end covers 13 are provided, and the two groups of end covers 13 are symmetrical to each other and are respectively fixedly installed on the opposite ends of the grating tube 11; the waterproof strip 14 is fixedly installed between the end cover 13 and the grating tube 11, and the waterproof sealing between the grating tube 11 and the end cover 13 is improved by the waterproof strip 14; finally, through the sealing protection of the housing 1, the waterproof performance of the light curtain sensor is improved.

[0057] The working principle of the embodiment of this application is as follows:

[0058] The fixing frame 41 is placed on the circuit assembly 2 through the joint action of the support rod 42 and the second self-locking part 43, and then multiple mounting plates 51 are positioned in turn by the positioning rod 53 and then clamped and installed on the fixing frame 41. The lens component 5 is detachably installed on the fixing frame 41 through the first self-locking part 6, so that the circuit assembly 2 and the lens assembly 3 are formed into a whole and sealed in the housing 1, thereby improving the installation or maintenance flexibility of the light curtain sensor.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. Light curtain sensor, characterized by: The invention comprises a housing (1), a circuit assembly (2) arranged in the housing (1) and used for emitting or receiving light, and a lens assembly (3) arranged in the housing (1) and located on the circuit assembly (2), wherein the lens assembly (3) comprises: A frame (4), the frame (4) being arranged on the circuit assembly (2); Lens components (5), with multiple groups of lens components (5) being arranged at intervals on the frame (4); A first self-locking member (6) is provided on the lens member (5) and is used to detachably lock the lens member (5) on the frame (4).

2. The light curtain sensor according to claim 1, wherein: The lens element (5) comprises: A mounting plate (51), the mounting plate (51) being snap-fitted and mounted on the frame (4); a lens body (52), the lens body (52) being arranged on the mounting plate (51) and being used to process light from the circuit assembly (2); A positioning rod (53) is provided on the mounting plate (51) and is engaged with the frame (4) for positioning.

3. The light curtain sensor according to claim 2, wherein: The frame (4) is provided with a locking hole (411), and the first self-locking member (6) comprises: A deformation block (61), wherein the deformation block (61) is arranged on the mounting plate (51) and can be elastically bent and deformed; A limit block (62) is provided on a side wall of the deformation block (61) away from the mounting plate (51); when the limit block (62) is pressed against the side wall of the locking hole (411), the deformation block (61) is pushed to bend and deform; after the limit block (62) passes through the locking hole (411), the deformation block (61) recovers its deformation and the limit block (62) is pressed against the side of the frame (4) away from the mounting plate (51).

4. The light curtain sensor according to claim 3, wherein: The side of the limit block (62) away from the mounting plate (51) and away from the deformation block (61) is provided on an inclined surface (621), and the locking hole (411) is provided with a guide surface (412) that cooperates with the inclined surface (621). When the limit block (62) enters the locking hole (411), the inclined surface (621) and the guide surface (412) slide and abut against each other and push the deformation block (61) to deform.

5. The light curtain sensor according to claim 2, wherein: The frame (4) comprises: A fixing frame (41), the fixing frame (41) being arranged on the circuit assembly (2) and used for supporting and fixing the lens component (5); A support rod (42), the support rod (42) being arranged on the fixing frame (41) and pressed against the circuit assembly (2); Second self-locking members (43), multiple groups of the second self-locking members (43) are spaced apart and arranged on opposite ends of the fixing frame (41), and the second self-locking members (43) cooperate with the support rod (42) to lock the fixing frame (41) on the circuit assembly (2).

6. The light curtain sensor according to claim 5, characterized in that: A plurality of frames (4) are arranged at intervals on the circuit assembly (2), a dovetail groove (413) is provided on one end of the fixing frame (41), and a dovetail block (414) is provided on the other end of the fixing frame (41) for engaging with the dovetail groove (413) on the adjacent fixing frame (41), wherein the length direction of the dovetail groove (413) is the same as the axial direction of the support rod (42).

7. The light curtain sensor according to claim 5, wherein: Multiple groups of apertures (7) for concentrating light are arranged at intervals on one side of the fixing frame (41) close to the circuit assembly (2). The apertures (7) are horn-shaped and have a smaller diameter the closer they are to the circuit assembly (2).

8. The light curtain sensor according to claim 1, wherein: The housing (1) comprises: A grating tube (11), the interior of the grating tube (11) being hollow and used to fix the circuit assembly (2) and the lens assembly (3), and a window for facilitating the passage of light is provided at one end of the grating tube (11) close to the lens body (52); A window piece (12), the window piece (12) is sealed on the window and allows light to pass through; End covers (13), wherein two sets of end covers (13) are provided and are respectively located at opposite ends of the grating tube (11); A waterproof strip (14) is provided between the end cover (13) and the grating tube (11) and is used to improve the waterproof sealing performance between the grating tube (11) and the end cover (13).

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