Wire outlet structure of photoelectric encoder

Abstract

The utility model relates to the technical field of photoelectric encoders, in particular to a wire outlet structure of a photoelectric encoder, which mainly comprises a wire outlet cavity arranged in a shell, a plug, a prepressing spring, a limit spring and an O-shaped ring arranged in the wire outlet cavity, an end cover mounted at an opening at the front end of the wire outlet cavity, a wiring hole arranged at the rear end of the wire outlet cavity, and a wire outlet arranged in the wiring hole. An internal cable of the photoelectric encoder penetrates through the wiring hole to be connected to the rear end of the plug, and the internal cable is sleeved with the pre-pressing spring; a plurality of limiting springs are arranged on the side face of the plug for elastic supporting, an external cable of the photoelectric encoder is connected with a socket matched with the plug, and electric conduction between the external cable and the internal cable is achieved through the plug and the socket. The wire outlet structure has the advantages of being good in sealing performance, high in shock resistance, easy to disassemble and the like, and the waterproof and dustproof performance of the encoder is improved when the wire outlet structure is applied to the encoder.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric encoders, and specifically provides an output line structure of a photoelectric encoder. Background Art

[0002] In recent years, with the rapid development of science and technology, encoders have been widely used in various fields. Encoders are devices that compile and convert signals or data into signal forms that can be used for communication, transmission and storage. Encoders convert angular displacement or linear displacement into electrical signals. The former is called a code disk, and the latter is called a yardstick. According to the readout method, encoders can be divided into contact and non-contact types; according to the working principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, and then convert this electrical signal into counting pulses, and the number of pulses is used to represent the size of the displacement. Each position of an absolute encoder corresponds to a certain digital code, so its indication is only related to the starting and ending positions of the measurement, but not to the intermediate process of the measurement.

[0003] The wire outlet structure of the existing encoder housing usually uses glue to seal the wire outlet gap, but this method makes it difficult to disassemble the encoder housing. The disassembly process can easily tear off the internal wires of the encoder, and reinstallation requires re-gluing and re-testing the sealing performance. In addition, there is a method of fastening with screws, which solves the problem of the housing being difficult to disassemble, but the gap where the screws are screwed in is difficult to completely eliminate, and it is difficult to perform dustproof and waterproof treatment, resulting in poor sealing. The above two methods have certain limitations in the design and use process, and problems such as poor sealing and poor shock resistance will occur, which will lead to a lower protection level for the entire product and complicated installation. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a lead-out knot of a photoelectric encoder and an encoder, optimizes the lead-out method and structure of the existing photoelectric encoder, supports the plug by a spring, enhances the anti-vibration performance of the lead-out part, and avoids the problem of increased contact gap due to wear of parts.

[0005] The wire outlet structure of the photoelectric encoder provided by the utility model comprises: a wire outlet cavity is arranged in the housing of the photoelectric encoder, and a plug, a pre-compression spring, a limit spring and an O-ring are arranged in the wire outlet cavity;

[0006] The front end of the outlet cavity is an open end, an end cover is installed on the outside of the open end, and a through hole is opened in the middle of the end cover; a wiring hole is opened at the rear end of the outlet cavity, and the internal cable of the photoelectric encoder passes through the wiring hole and is connected to the rear end of the plug; a preload spring is sleeved on the internal cable, one end of the preload spring abuts against the rear end of the outlet cavity, and the other end abuts against the rear end of the plug; a plurality of limit springs are arranged on the side of the plug, one end of the limit spring abuts against the side wall of the outlet cavity, and the other end abuts against the side wall of the plug;

[0007] An O-ring fixing structure is provided at the front end of the plug, and the O-ring is fixed between the plug and the end cover through the O-ring fixing structure;

[0008] The external cable of the photoelectric encoder is connected with a socket matched with the plug, and electrical conduction between the external cable and the internal cable is achieved through the plug and the socket.

[0009] Preferably, a plurality of limit spring fixing grooves are opened on the side wall of the outlet cavity, one end of the limit spring is arranged in the limit spring fixing groove, and the other end is connected to a flexible gasket, which abuts against the side of the plug through the flexible gasket.

[0010] Preferably, the O-ring is made of rubber material.

[0011] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0012] The utility model changes the traditional shell outlet to a shell socket outlet, thereby improving the integration of the encoder, making the internal cable and the external cable independent of each other, and the user can customize the cable length without affecting the production and assembly of the whole machine; the plug is supported and limited by the pre-stressed spring and the limit spring, which effectively improves the seismic performance of the outlet structure, avoids problems such as debonding or enlarged contact gaps between parts due to vibration; and when the O-ring or gasket is worn and a gap is generated at the connection, the pre-stressed spring and the limit spring can reduce the wear gap by squeezing the pre-stressed elastic force, thereby greatly improving the sealing.

[0013] The utility model connects the external cable line with the internal cable line through a plug and a socket, and under the conditions of pulling and vibration, the reliability is significantly improved compared with the traditional silicone seal; and in the production process, it is easy to assemble and store.

[0014] The cable outlet structure of the utility model can directly pull out the cable inside the encoder by loosening the end cover screws when problems such as poor plug material or the encoder needs to be repaired, thereby reducing maintenance costs and the risks of cable damage, circuit board damage and shell scrapping; and when installing again, there is no need to carry out processes such as gluing and testing airtightness, which reduces the complexity of disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the output line structure of the photoelectric encoder provided according to an embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of a scheme for changing the output line structure of a photoelectric encoder provided in an embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of an encoder provided according to an embodiment of the utility model.

[0018] Reference numerals include:

[0019] Outlet cavity 1, plug 2, end cover 3, screw 4, preload spring 5, limit spring 6, O-ring 7, quick-release head 8, adhesive 9, limit sleeve 10, integrated cable 11, housing 12, oil seal 13, retaining ring 14, sealing cover 15, flange base 16, main shaft 17, rubber ring 18, spring 19, ceramic ring 20, O-ring 21. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present utility model will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and do not constitute a limitation of the utility model.

[0022] like Figure 1 As shown, an embodiment of the utility model provides a wiring structure of a photoelectric encoder, which uses a socket wiring method to replace the traditional wiring method of punching holes in the shell. An outlet cavity 1 is provided in the shell of the photoelectric encoder, and a plug 2, a preload spring 5, a limit spring 6 and an O-ring 7 are provided in the outlet cavity 1. The outlet cavity 1 is a semi-closed structure, and its front end is an open end, that is, the side facing the shell is an open end. A smaller wiring hole is provided at the rear end of the outlet cavity 1, and a groove concentric with the wiring hole is also provided on the outer edge of the wiring hole. The preload spring 5 is sleeved on the internal cable of the photoelectric encoder, one end of the internal cable is connected to the rear end of the plug 2, and the other end is connected to the signal circuit of the encoder through a quick-release head 8.

[0023] The outer diameter of the preload spring 5 is larger than the diameter of the wiring hole at the rear end of the outlet cavity 1 and smaller than the diameter of the groove at the outer edge of the wiring hole. One end of the preload spring 5 is fixed or abutted in the groove, and the other end of the preload spring 5 abuts against the rear end of the plug 2.

[0024] The plug 2 as a whole is an embedded groove structure, and a plurality of relatively positioned limit spring fixing grooves are opened on the inner wall of the outlet cavity 1 on the side of the plug 2. A limit spring 6 is installed in the limit spring fixing groove, and the limit spring 6 is mainly used to elastically support the side of the plug 2. In addition, a flexible gasket can be connected to the end of the limit spring 6 that contacts the plug 2, and the flexible gasket abuts against the side of the plug to prevent external vibration from affecting the outlet structure. When installed at the factory, the limit spring 6 is in a compressed state and has an elastic preload. After the encoder is used for a long time, the flexible gasket will be worn, and the side of the plug 2 may also be deformed. The limit spring 6 will press the flexible gasket to the side of the plug 2 to avoid the outlet gap at the abutment position, causing the plug 2 to shake.

[0025] The front end of the plug 2 is provided with an O-ring fixing structure, that is, the front end face of the plug 2 is stepped, and this position is used to install the O-ring 7, which is made of rubber material and has certain deformation characteristics. After the O-ring 7 is put on the front end of the plug 2, the end cover 3 is installed at the open end of the outlet cavity 1. The end cover 3 is a flange-like structure with a through hole in the middle. The through hole is used to ensure that the socket of the external cable can be connected to the plug 2. The diameter of the through hole needs to be smaller than the outer diameter of the front end face of the plug 2. The outer edge of the end cover 3 is provided with a threaded through hole, and the end cover 3 is fixed to the open end of the outlet cavity 1 by a screw 4. During the screwing process of the screw 4, the pre-stress spring 5 and the O-ring 7 will be continuously squeezed. After the screw 4 is fully screwed in, the pre-stress spring 5 will press the plug 2 to the inner surface of the end cover 3, and the O-ring 7 will be squeezed and deformed, which will reduce the gap between the plug 2 and the end cover 3. After the encoder is used for a long time, the O-ring 7 and the like will be worn, and the preload spring 5 will continue to press the plug 2 to the inner surface of the end cover 3 to avoid gaps at the contact point, which will lead to problems such as reduced sealing performance.

[0026] Due to the outlet structure of the photoelectric encoder proposed in the embodiment of the utility model, the traditional encoder cable is directly led out through the opening on the shell, and the outlet mode connected to the outside is improved to the outlet mode of the shell plug 2. The core of this improvement is to introduce a standard plug 2, which is integrated on the shell of the encoder, and the original integrated cable is divided into two parts, namely the external cable and the internal cable. The internal cable of the encoder is connected to the socket of the external cable through the plug 2, rather than by hard wiring. In this way, the integration of the encoder can be improved, the external cable and the internal cable are completely independent, the internal cable is fixed inside the encoder, and the external cable can be selected and connected according to the specific needs of the user, which greatly reduces unnecessary waste and potential wrong connection caused by inappropriate cable length. For manufacturers, the encoder with a plug 2 can be pre-assembled without cutting and processing the cable on site, which simplifies the production process and improves production efficiency; when the external cable of the encoder needs to be replaced or maintained, the user can easily disassemble and replace the external cable without opening the shell of the encoder, which helps to solve the problem quickly.

[0027] As a preferred embodiment, in order to ensure the connection reliability between the plug 2 and the socket on the external cable line, an internal thread can be tapped on the inner diameter of the through hole of the end cover 3 or the opening of the plug, and a rotatable locking ring is connected to the front end of the socket on the external cable line. The outer diameter of the locking ring is tapped with an external thread matching the internal thread, and the socket and the plug 2 are locked by manually twisting the locking ring.

[0028] like Figure 2 As shown, the utility model also designs a change scheme for the existing integrated cable 11, which is different from the output structure of the aforementioned photoelectric encoder in that: the plug 2 is replaced by a limit sleeve 10, a through hole is opened in the middle of the limit sleeve 10, and the integrated cable 11 passes through the through hole from the inside of the encoder, and an adhesive 9 is injected between the gap between the integrated cable 11 and the through hole, and the limit sleeve 10 is pressed to the end cover 3 by the pre-stressed spring 5, and the dustproof and waterproof performance is improved by the elastic deformation of the O-ring 7; the limit sleeve 10 is longitudinally fixed by the limit spring 6, and the change scheme can ensure the same level of sealing and vibration-proof effects as the original scheme.

[0029] like Figure 3 As shown, the embodiment of the utility model also proposes an encoder, Figure 1The output line structure of the photoelectric encoder shown is applied in the traditional photoelectric encoder, and further includes a housing 12, a light-emitting component, a grating disk, a reading head, a main shaft 17 and a flange base 16. In order to improve the overall sealing of the encoder, an oil seal 13 is arranged between the main shaft 17 and the housing 12, a retaining ring 14 is arranged below the oil seal 13, and a sealing cover 15 is arranged below the retaining ring 14. The sealing cover 15 covers the light-emitting component, the grating disk, the reading head and other structures inside the encoder, and a structure connected to the quick-release head 8 of the internal cable is arranged on the sealing cover 15. The quick-release head 8 is connected to the end away from the plug 2, and the internal cable is segmented again, which is convenient for the disassembly and assembly of the encoder. An annular groove is arranged at the position where the flange base 16 is fixedly connected to the housing 12, and an O-ring 21 is installed in the annular groove, and its elastic deformation improves the dustproof and waterproof performance. Friction seal is adopted between flange base 16 and main shaft 17. An annular groove is arranged near flange base 16 and main shaft 17. A spring is arranged in the annular groove. A rubber ring 18 is connected to the upper end of the spring. A ceramic ring 20 is connected to the main shaft 17 at a position opposite to the annular groove (or rubber ring 18). Rubber ring 18 abuts against ceramic ring 20. In order to reduce the friction between rubber ring 18 and ceramic ring 20 while ensuring the sealing performance, multiple concentric grooves are opened on the upper surface of rubber ring 18, and grease is filled in the groove. At the same time, the grease can effectively isolate water droplets and gas, further improving the sealing performance of the encoder.

[0030] The encoder of the utility model adopts friction seal between the main shaft and the flange base, and the combined use of ceramic and rubber sealing rings can effectively prevent dust, impurities, etc. from entering the interior of the encoder, and reduce rubber wear and contamination of the interior of the encoder. This has high practical significance for encoders used in harsh environments. The improvement of dustproof performance helps to extend the service life of the encoder and improve its working stability. The combined use of ceramic and rubber sealing rings can also have high barrier performance against water droplets and moisture. In humid and rainy environments, ordinary encoders are prone to moisture and water ingress, causing malfunctions, while the closed encoder housing can effectively prevent moisture intrusion and ensure the normal operation of the encoder.

[0031] In order to verify the effectiveness of the utility model, an air tightness test was carried out on the above-mentioned encoder, and air was inflated into the interior of the encoder through a specific air inlet hole (air pressure 0.3Mpa). The test results showed that the air pressure inside the encoder was constant, and there was no gas exposure. After continuous pressurization (air pressure 0.5Mpa), gas began to overflow from the oil seal 13, and the sealing of the wire outlet structure was good. At the same time, after the dustproof and waterproof tests, the protection level can reach IP64.

[0032] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0033] The above specific implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A line output structure of a photoelectric encoder, characterized in that: The housing of the photoelectric encoder is provided with a wire outlet cavity, and the wire outlet cavity is provided with a plug, a preload spring, a limit spring and an O-ring; The front end of the outlet cavity is an open end, an end cover is installed on the outside of the open end, and a through hole is opened in the middle of the end cover; a wiring hole is opened at the rear end of the outlet cavity, and the internal cable of the photoelectric encoder passes through the wiring hole and is connected to the rear end of the plug; the pre-stress spring is sleeved on the internal cable, one end of the pre-stress spring abuts on the rear end of the outlet cavity, and the other end abuts on the rear end of the plug; a plurality of limit springs are arranged on the side of the plug, one end of the limit spring abuts on the side wall of the outlet cavity, and the other end abuts on the side wall of the plug; An O-ring fixing structure is provided at the front end of the plug, and the O-ring is fixed between the plug and the end cover through the O-ring fixing structure; The external cable of the photoelectric encoder is connected to a socket matched with the plug, and electrical conduction between the external cable and the internal cable is achieved through the plug and the socket.

2. The output line structure of the photoelectric encoder according to claim 1, characterized in that: A plurality of limit spring fixing grooves are formed on the side wall of the outlet cavity, one end of the limit spring is arranged in the limit spring fixing groove, and the other end is connected with a flexible gasket, which abuts against the side surface of the plug through the flexible gasket.

3. The output line structure of the photoelectric encoder according to claim 1, characterized in that: The O-ring is made of rubber material.

4. The output line structure of the photoelectric encoder according to claim 1, characterized in that: The inner diameter of the through hole of the end cover or the opening of the plug is tapped with an internal thread, the front end of the socket is connected to a rotatable locking ring, the outer diameter of the locking ring is tapped with an external thread matching the internal thread, and the socket and the plug are locked by screwing the locking ring.

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