High strength optoelectronic encoder housing

Abstract

The utility model discloses a kind of high-strength photoelectric encoder shell, belong to photoelectric encoder technical field, its technical scheme main points include photoelectric encoder shell structure, the photoelectric encoder shell structure includes alloy shell layer, the inside of alloy shell layer is provided with reinforcing layer, and the inside of reinforcing layer is provided with electromagnetic shield layer, buffer layer is arranged between the alloy shell layer and reinforcing layer, viscous elastic damping layer is arranged between reinforcing layer and electromagnetic shield layer, provide basic strength by alloy shell layer, honeycomb buffer layer is absorbed impact energy by cell collapse, reinforcing layer improves overall rigidity, three synergies resist external mechanical load, avoid internal code disc eccentricity caused by shell deformation, and form composite shielding structure by nanocrystalline soft magnetic alloy and graphene coating, block high-frequency electromagnetic interference, viscous elastic damping layer consumes vibration energy, reduce signal fluctuation caused by vibration.

Description

Technical Field

[0001] This utility model relates to the field of photoelectric encoder technology, and in particular to a high-strength photoelectric encoder housing. Background Technology

[0002] An optical encoder is a sensor that converts the mechanical geometric displacement on the output shaft into pulses or digital signals through photoelectric conversion. It is the most widely used sensor. An optical encoder consists of a light source, a code disk, and a photosensitive element. The code disk is a circular plate of a certain diameter with several rectangular holes evenly spaced. Since the code disk is coaxial with the motor, the code disk rotates at the same speed as the motor when it rotates. The detection device composed of light-emitting diodes and other electronic components detects and outputs several pulse signals. By calculating the number of pulses output by the optical encoder per second, the current speed of the motor can be reflected.

[0003] Existing encoders are used by pressing buttons directly, and the encoders are directly exposed to the outside, which makes them prone to bending when subjected to impact. The casing cannot protect them, thus affecting normal use by the user.

[0004] An existing patent (publication number: CN219776767U) discloses a protective structure for the encoder housing. This utility model uses a transmission mechanism to insert a locking rod into the upper and lower protective sleeves for connection. The upper and lower protective sleeves then protect the encoder housing. The encoder will not bend when subjected to impact force, thus protecting the housing and ensuring normal use by the user.

[0005] To address the aforementioned issues, existing patents offer solutions that can protect the encoder housing. However, encoder housings are often made of traditional aluminum alloy, which is prone to deformation when subjected to radial impacts (such as mechanical collisions), leading to internal code disk eccentricity and reduced measurement accuracy. Furthermore, the electromagnetic shielding effectiveness of aluminum alloy housings is limited and cannot meet the protection requirements for high-frequency electromagnetic interference (such as inverter interference) in servo systems.

[0006] To address this, a high-strength photoelectric encoder housing is proposed. Utility Model Content

[0007] The purpose of this utility model is to provide a high-strength photoelectric encoder housing, which can solve the problem that most existing photoelectric encoder housings are made of traditional aluminum alloy housings. Traditional aluminum alloy housings are prone to deformation when subjected to radial impact (such as mechanical collision), resulting in internal code disk eccentricity and reduced measurement accuracy. Furthermore, the electromagnetic shielding effectiveness of aluminum alloy housings is limited, which cannot meet the protection requirements of high-frequency electromagnetic interference (such as frequency converter interference) in servo systems.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-strength photoelectric encoder housing, comprising a photoelectric encoder housing structure, wherein the photoelectric encoder housing structure comprises an alloy housing layer, wherein a reinforcing layer is disposed inside the alloy housing layer, and an electromagnetic shielding layer is disposed inside the reinforcing layer, wherein a buffer layer is disposed between the alloy housing layer and the reinforcing layer, and wherein a viscoelastic damping layer is disposed between the reinforcing layer and the electromagnetic shielding layer.

[0009] Preferably, the electromagnetic shielding layer is a nanocrystalline soft magnetic alloy, and the surface of the electromagnetic shielding layer is provided with a graphene coating.

[0010] Preferably, the buffer layer has an overall honeycomb structure, and the honeycomb structure is made of aluminum alloy.

[0011] Preferably, the buffer layer is bonded between the alloy outer shell layer and the reinforcing layer using epoxy resin adhesive.

[0012] Preferably, the reinforcing layer is composed of a carbon fiber ceramic matrix composite layer.

[0013] Preferably, the viscoelastic damping layer is made of butyl rubber and has a thickness of 0.2-0.3 mm.

[0014] Preferably, a protective cover is provided on the top of the photoelectric encoder housing structure, and the protective cover is bolted to the photoelectric encoder housing structure.

[0015] Preferably, the protective cover has four mounting holes evenly distributed axially inside, and each hole has a coaxially arranged annular stress relief groove around its periphery.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This application provides basic strength through an alloy outer shell layer, absorbs impact energy through cell collapse of the honeycomb buffer layer, and enhances overall stiffness through a reinforcing layer. The three work together to resist external mechanical loads and avoid internal code disk eccentricity caused by outer shell deformation.

[0018] 2. This application uses a composite shielding structure formed by nanocrystalline soft magnetic alloy and graphene coating to block high-frequency electromagnetic interference, and the viscoelastic damping layer consumes vibration energy and reduces signal fluctuations caused by vibration. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of the high-strength photoelectric encoder housing of this utility model;

[0020] Figure 2 This is an exploded view of the housing structure of the photoelectric encoder of this utility model;

[0021] Figure 3This is a schematic diagram showing the connection between the buffer layer, the alloy shell layer, and the reinforcing layer of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the protective cover plate of this utility model.

[0023] In the figure, 1 is the photoelectric encoder housing structure; 2 is the alloy housing layer; 3 is the reinforcing layer; 4 is the electromagnetic shielding layer; 5 is the buffer layer; 6 is the viscoelastic damping layer; 7 is the protective cover plate; 8 is the mounting hole; and 9 is the annular stress relief groove. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-4 The present invention provides the following technical solution:

[0026] A high-strength photoelectric encoder housing includes a photoelectric encoder housing structure 1, which includes an alloy housing layer 2, a reinforcing layer 3 inside the alloy housing layer 2, an electromagnetic shielding layer 4 inside the reinforcing layer 3, a buffer layer 5 between the alloy housing layer 2 and the reinforcing layer 3, and a viscoelastic damping layer 6 between the reinforcing layer 3 and the electromagnetic shielding layer 4.

[0027] In this embodiment: the alloy outer shell layer 2 provides basic strength, the honeycomb buffer layer 5 absorbs impact energy through cell collapse, and the reinforcing layer 3 improves the overall stiffness. The three work together to resist external mechanical loads and avoid internal code disk eccentricity caused by shell deformation. The composite shielding structure formed by the nanocrystalline soft magnetic alloy and graphene coating blocks high-frequency electromagnetic interference, and the viscoelastic damping layer 6 consumes vibration energy and reduces signal fluctuations caused by vibration.

[0028] Specifically, such as Figure 2 As shown, the electromagnetic shielding layer 4 is a nanocrystalline soft magnetic alloy, and the surface of the electromagnetic shielding layer 4 is coated with graphene.

[0029] Specifically, such as Figure 2 , Figure 3 As shown, the buffer layer 5 has a honeycomb structure, and the honeycomb structure is made of aluminum alloy.

[0030] Specifically, such as Figure 3 As shown, the buffer layer 5 is bonded between the alloy outer shell layer 2 and the reinforcing layer 3 with epoxy resin adhesive.

[0031] In this embodiment: by depositing a graphene coating on the surface of a nanocrystalline soft magnetic alloy substrate, a composite structure of magnetic shielding and electrical shielding can be formed. The high magnetic permeability of the nanocrystalline alloy absorbs low-frequency magnetic field interference, and the conductive network of the graphene coating reflects high-frequency electromagnetic waves. The combination of the two covers the electromagnetic shielding requirements of the entire frequency band, ensuring the stability of the internal signal of the encoder. The honeycomb structure of the porous buffer layer 5 allows it to collapse in a specific order when subjected to impact, converting the concentrated impact force into a distributed load and avoiding excessive local stress.

[0032] Specifically, such as Figure 2 As shown, the reinforcing layer 3 is composed of a carbon fiber ceramic matrix composite layer.

[0033] Specifically, such as Figure 2 As shown, the viscoelastic damping layer 6 is made of butyl rubber and has a thickness of 0.2-0.3 mm.

[0034] In this embodiment: the reinforcing layer 3 is composed of a carbon fiber ceramic matrix composite layer. The carbon fiber reinforcing phase provides high tensile strength and fatigue resistance, while the ceramic matrix imparts high stiffness and wear resistance. The combination of the two makes the reinforcing layer 3 have both the toughness of metal and the rigidity of ceramic, resisting the permanent deformation of the shell after impact. The viscoelastic damping layer 6 is made of butyl rubber. The high loss factor of butyl rubber causes it to undergo shear deformation under vibration, converting mechanical energy into heat energy and reducing the vibration amplitude of the shell.

[0035] Specifically, such as Figure 1 As shown, a protective cover plate 7 is provided on the top of the photoelectric encoder housing structure 1, and the protective cover plate 7 is bolted to the photoelectric encoder housing structure 1.

[0036] Specifically, such as Figure 4 As shown, the protective cover plate 7 has four mounting holes 8 evenly distributed axially inside, and each hole is provided with a coaxially arranged annular stress relief groove 9 around its periphery.

[0037] In this embodiment: by setting a bolted protective cover plate 7 on the top of the photoelectric encoder housing structure 1, the housing and the housing body form a sealed cavity. The bolted structure facilitates disassembly and maintenance. A sealing strip (such as silicone rubber) can be set between the cover plate and the housing to improve the protection level and prevent dust and liquid from entering. The protective cover plate 7 itself has the same strength as the housing and can jointly bear the external load, avoiding the top from becoming a weak point in the structure. The annular stress relief groove 9 changes the stress distribution path through the geometric structure, dispersing the concentrated stress generated by the mounting bolts (such as tensile stress caused by tightening torque) to the surrounding area, thus preventing the initiation of cracks at the edge of the hole.

[0038] Working principle: During installation of the photoelectric encoder housing structure 1, the protective cover plate 7 is connected to the photoelectric encoder housing structure 1 by bolts. During the tightening process, the annular stress relief groove 9 changes the stress distribution path through its geometric structure, dispersing the concentrated stress generated by the installation bolts to the surrounding area and preventing the initiation of cracks at the hole edge. When the photoelectric encoder housing structure 1 is in use, the alloy housing layer 2 provides basic strength, the honeycomb buffer layer 5 absorbs impact energy through cell collapse, and the reinforcing layer 3 improves the overall rigidity. The three work together to resist external mechanical loads and prevent the internal code disk from being eccentric due to housing deformation. A composite shielding structure is formed by nanocrystalline soft magnetic alloy and graphene coating to block high-frequency electromagnetic interference, and the viscoelastic damping layer 6 consumes vibration energy and reduces signal fluctuations caused by vibration.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-strength photoelectric encoder housing, comprising a photoelectric encoder housing structure (1), characterized in that: The photoelectric encoder housing structure (1) includes an alloy housing layer (2), a reinforcing layer (3) is provided inside the alloy housing layer (2), and an electromagnetic shielding layer (4) is provided inside the reinforcing layer (3). A buffer layer (5) is provided between the alloy housing layer (2) and the reinforcing layer (3), and a viscoelastic damping layer (6) is provided between the reinforcing layer (3) and the electromagnetic shielding layer (4).

2. The high-strength photoelectric encoder housing according to claim 1, characterized in that: The electromagnetic shielding layer (4) is a nanocrystalline soft magnetic alloy, and the surface of the electromagnetic shielding layer (4) is coated with graphene.

3. The high-strength photoelectric encoder housing according to claim 1, characterized in that: The buffer layer (5) has a honeycomb structure as a whole, and the honeycomb structure is made of aluminum alloy.

4. The high-strength photoelectric encoder housing according to claim 1, characterized in that: The buffer layer (5) is bonded between the alloy shell layer (2) and the reinforcing layer (3) with epoxy resin adhesive.

5. The high-strength photoelectric encoder housing according to claim 1, characterized in that: The reinforcing layer (3) is composed of a carbon fiber ceramic matrix composite layer.

6. The high-strength photoelectric encoder housing according to claim 1, characterized in that: The viscoelastic damping layer (6) is made of butyl rubber and has a thickness of 0.2-0.3 mm.

7. The high-strength photoelectric encoder housing according to claim 1, characterized in that: The top of the photoelectric encoder housing structure (1) is provided with a protective cover plate (7), and the protective cover plate (7) is bolted to the photoelectric encoder housing structure (1).

8. The high-strength photoelectric encoder housing according to claim 7, characterized in that: The protective cover plate (7) has four mounting holes (8) evenly distributed axially inside, and each hole is provided with a coaxially arranged annular stress relief groove (9).

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