Encoder and assembling method thereof

Abstract

The invention relates to the technical field of encoders, in particular to an encoder and an assembling method thereof, and the encoder comprises a shell, a core assembly, a control circuit board, a shielding wire, a signal wire and a metal guide wire. The shell sleeves the outer side of the core assembly, and the core assembly comprises a main body part. The control circuit board is arranged above the core assembly and located in the shell. The first end of the shielding wire and the first end of the signal wire are both connected to the control circuit board, and the second end of the shielding wire and the second end of the signal wire form a wire harness and extend outwards. The first end of the metal guide wire is connected to the control circuit board and electrically connected with the first end of the shielding wire through a wire in the control circuit board. And the second end of the metal guide wire is clamped between the shell and the main body part in an interference fit manner, so that the shell is connected to the shielding wire through the metal guide wire. Therefore, effective conduction of the shielding wire can be ensured without setting a fixing screw, and the structure is simpler.

Description

Technical Field

[0001] The present invention belongs to the technical field of encoders, and in particular relates to an encoder and an assembling method thereof. Background Art

[0002] In the field of modern electronic technology, encoders are widely used in various automatic control systems as a sensor that converts rotational displacement into digital pulse signals. The effective connection of the encoder's shielded wire can ensure that the signal is not interfered by the outside world.

[0003] The traditional encoder shielding wire uses fixing screws to ensure the effective conduction of the shielding wire. However, in practical applications, it is often encountered that the encoder has no fixing screws or the fixing screws are lost. In this way, the effective connection of the encoder shielding wire cannot be achieved, making the signal transmission process susceptible to external electromagnetic interference, affecting the performance of the encoder and the stability of the system. Some existing alternatives may be able to achieve a certain degree of conduction in the short term, but due to small contact area, insufficient contact pressure and other reasons, it is impossible to achieve a stable and reliable conduction effect. Moreover, as the use time increases, due to the influence of environmental factors, the connection parts are prone to loosening, oxidation and other problems, which will lead to a decrease in conduction performance. Some alternatives require major changes to the structure of the encoder, which increases the manufacturing cost and process complexity. Therefore, in the case where the encoder does not have fixing screws, how to achieve effective conduction of the shielding wire has always been a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of this, the invention aims to provide an encoder and an assembly method thereof, which can ensure effective conduction of the shielding wire without setting fixing screws and has a simpler structure.

[0005] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0006] An encoder comprising:

[0007] case;

[0008] The core component is sleeved on the outer side of the shell body, and the core component includes a main body;

[0009] A control circuit board is arranged above the core component and located inside the housing;

[0010] A shielding wire and a signal wire, wherein a first end of the shielding wire and a first end of the signal wire are both connected to the control circuit board, and a second end of the shielding wire and a second end of the signal wire form a wire harness and extend outward; and

[0011] A metal guide wire, the first end of which is connected to the control circuit board and is electrically connected to the first end of the shielding wire through a wire in the control circuit board; the second end of the metal guide wire is clamped between the shell and the main body by interference fit, so that the shell is connected to the shielding wire through the metal guide wire.

[0012] Furthermore, the core component also includes a main shaft and a bearing; the main body includes a mounting cavity, the bearing is sleeved on the main shaft and fixed to the inner wall of the mounting cavity, and the bearing is used to enable the main shaft to rotate relative to the main body.

[0013] Furthermore, the core component also includes a light source and a grating, the grating is sleeved on the main shaft and is located between the light source and the control circuit board; the light source is arranged in the main body and is arranged toward the grating.

[0014] Furthermore, the first end of the metal guide wire is connected to a side surface of the control circuit board away from the grating, and extends downward to between the shell and the main body after being bent.

[0015] Furthermore, the main body is provided with a groove portion, which is formed by being recessed downward from the upper surface of the main body; the second end of the metal guide wire and the shell are located in the groove portion, and the second end of the metal guide wire is clamped between the shell and the inner wall of the groove portion by interference fit.

[0016] Furthermore, the groove portion is located at the outer edge of the main body portion.

[0017] Furthermore, the diameter of the metal guide wire is 0.5 mm to 1 mm; and / or

[0018] The length of the metal guide wire is 10 mm to 20 mm.

[0019] Furthermore, the length of the contact point between the second end of the metal guide wire and the main body is greater than or equal to 2 mm; and / or

[0020] The distance between the first end of the metal guide wire and the first end of the shielding wire is less than or equal to 10 mm.

[0021] An encoder assembly method is applied to the encoder as described above, and the assembly method comprises:

[0022] Welding the first end of the metal guide wire to the control circuit board;

[0023] Assemble the control circuit board above the core component, and bend the metal guide wire so that the metal guide wire extends downward;

[0024] Sleeve the shell onto the outside of the main body and adjust the position of the metal guide wire;

[0025] The main body and the shell are pressed together by a pressing device so that the second end of the metal guide wire is clamped between the shell and the main body by interference fit.

[0026] Furthermore, the control circuit board is provided with a soldering pad hole; the first end of the metal guide wire is soldered to the control circuit board, comprising:

[0027] Pass the first end of the metal guide wire through the pad hole; wherein the length of the metal guide wire passing through the pad hole is less than 0.8 mm;

[0028] At a set time, the solder wire introduced into the pad hole is melted by a soldering device with a set temperature of 280° C. to 320° C., so as to solder the first end of the metal guide wire to the control circuit board.

[0029] Compared with the prior art, the invention can achieve the following beneficial effects: the encoder of the invention includes a metal guide wire, the first end of which is connected to the control circuit board and is electrically connected to the first end of the shielding wire through the wire in the control circuit board. The second end of the metal guide wire is clamped between the shell and the main body by interference fit. The shielding wire is connected to the first end of the metal guide wire through the wire of the control circuit board, and the second end of the metal guide wire clamped between the shell and the main body by interference fit is connected to the main body and the shell, thereby completing the conduction of the shielding wire signal. In this way, the effective conduction of the shielding wire can be ensured without setting a fixing screw, and the structure is simpler. Thereby effectively solving the conduction problem of the shielding wire when the encoder does not have a fixing screw, ensuring the stability and accuracy of signal transmission, greatly reducing errors and faults caused by signal interference, and improving the working reliability of the encoder. And by using the second end of the metal guide wire to be clamped between the shell and the main body by interference fit, there is no need to make large-scale changes to the original structure of the encoder, reducing the manufacturing cost and process complexity, which is conducive to improving production efficiency and reducing production costs. At the same time, the above connection method has good stability and durability, so that it can maintain stable contact pressure during long-term use, and is not prone to loosening or poor contact due to environmental factors such as temperature changes and vibrations, thus extending the service life of the encoder. This innovative connection method has high versatility and scalability, and can be applied to encoders of various types and specifications, providing more flexibility and choice for the design and manufacture of encoders. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0031] Figure 1 A schematic diagram of an encoder according to an embodiment of the present invention;

[0032] Figure 2 A partial cross-sectional view of an encoder according to an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of a control circuit board of an encoder according to an embodiment of the present invention;

[0034] Figure 4 A flowchart of an encoder assembly method according to an embodiment of the present invention;

[0035] Figure 5 A sub-flow chart of the method for assembling an encoder described in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] Encoder 10; housing 11; core component 12; control circuit board 13; shielding wire 14, signal wire 15; metal guide wire 16; main body 17; main shaft 18; bearing 19; installation cavity 20; wiring harness 21; conductor 22; light source 23; grating 24; groove part 25. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the invention clearer, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and do not constitute a limitation to the invention. Similar components in different embodiments use associated similar component numbers. In the following embodiments, many detailed descriptions are to enable the invention to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other components, materials, and methods. In some cases, some operations related to the invention are not shown or described in the specification, in order to avoid the core part of the invention being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0040] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0041] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] See also Figure 1 , Figure 2 and Figure 3 As shown, the encoder 10 includes a housing 11 , a core component 12 , a control circuit board 13 , a shielding wire 14 , a signal wire 15 and a metal guide wire 16 .

[0044] The shell 11 is sleeved on the outside of the core component 12, which can protect the core component 12. The core component 12 includes a main body 17. The materials of the shell 11 and the main body 17 can be metal. In one embodiment, the core component 12 also includes a main shaft 18 and a bearing 19. The main shaft 18 is used to connect with an external rotating structure, and the external rotating structure can refer to the output shaft of the motor. The bearing 19 can be a ball bearing. The main body 17 includes a mounting cavity 20, and the bearing 19 is sleeved on the main shaft 18 and fixed to the inner wall of the mounting cavity 20 so that the main shaft 18 can be rotatably arranged in the mounting cavity 20. The bearing 19 is used to realize that the main shaft 18 can rotate relative to the main body 17. The control circuit board 13 is arranged above the core component 12 and is located in the shell 11. The control circuit board 13 can realize the control of the encoder 10.

[0045] The first end of the shielding wire 14 and the first end of the signal wire 15 are both connected to the control circuit board 13, and the first end of the shielding wire 14 and the first end of the signal wire 15 can be connected to the control circuit board 13 by welding. The second end of the shielding wire 14 and the second end of the signal wire 15 form a wire harness 21 and extend outward.

[0046] The material of the metal guide wire 16 can be copper, which has good electrical conductivity and flexibility. In one embodiment, the diameter of the metal guide wire 16 is 0.5 mm to 1 mm. The length of the metal guide wire 16 is 10 mm to 20 mm, which can ensure that the metal guide wire 16 can maintain stable performance during long-term use. The first end of the metal guide wire 16 is connected to the control circuit board 13 and is connected to the first end of the shielding wire 14 through the wire 22 (such as Figure 314). In one embodiment, the distance between the first end of the metal guide wire 16 and the first end of the shielding wire 14 is less than or equal to 10 mm. Among them, the first end of the metal guide wire 16 can be connected to the control circuit board 13 by welding, so that the first end of the metal guide wire 16 can be closely connected to the internal circuit of the control circuit board 13, the stability and reliability of signal transmission are improved, and the performance of the encoder 10 is enhanced. The second end of the metal guide wire 16 is clamped between the shell 11 and the main body 17 by interference fit, so that the shell 11 is connected to the shielding wire 14 through the metal guide wire 16. Among them, there can be a gap between the shell 11 and the main body 17, and the second end of the metal guide wire 16 can be interference fit in the gap, so that the metal guide wire 16 is clamped between the shell 11 and the main body 17 by interference fit. The interference fit can continuously provide contact pressure, and will not be loose or poorly contacted due to the extension of use time or changes in environmental factors, so that the connection between the metal guide wire 16 and the shell 11 and the metal guide wire 16 and the main body 17 is more stable and reliable, extending the service life of the encoder 10. And such a setting does not require large-scale changes to the original structure of the encoder 10, which reduces the manufacturing cost and process complexity, and is conducive to improving production efficiency and reducing production costs. The shielding wire 14 is connected to the first end of the metal guide wire 16 through the wire 22 of the control circuit board 13, and the second end of the metal guide wire 16 clamped between the shell 11 and the main body 17 by interference fit is connected to the main body 17 and the shell 11, thereby completing the conduction of the shielding wire 14 signal. In this way, the effective conduction of the shielding wire 14 can be ensured without setting a fixing screw, and the structure is simpler. Therefore, the shielding wire 14 can be used to prevent the signal line 15 from being subjected to external electromagnetic interference, greatly reducing the errors and faults caused by signal interference of the encoder 10, and improving the working reliability of the encoder 10. At the same time, the good electrical conductivity of the metal guide wire 16 can more effectively shield the external electromagnetic interference, ensure the stable transmission of the encoder 10 signal, and can be applied to encoders 10 of different types and specifications, providing more flexibility and selection space for the design and manufacture of the encoder 10.

[0047] In one embodiment, the length of the contact point between the second end of the metal guide wire 16 and the main body 17 is greater than or equal to 2 mm, so that the shielding wire 14 has a good conduction effect and the encoder 10 has high reliability. Figure 1 In the illustrated embodiment, the metal guide wire 16 is first bent and then extended in the vertical direction from the first end of the metal guide wire 16 to the second end of the metal guide wire 16 , so that the contact point between the second end of the metal guide wire 16 and the main body 17 is a straight line, and its length H is ≥ 2 mm.

[0048] In one embodiment, the core component 12 further includes a light source 23 and a grating 24. The grating 24 is sleeved on the main shaft 18 and is located between the light source 23 and the control circuit board 13. The grating 24 can rotate synchronously with the main shaft 18. The light source 23 is disposed in the main body 17 and is disposed toward the grating 24. The light beam emitted by the light source 23 can be irradiated on the grating 24. When the grating 24 rotates synchronously with the main shaft 18, the light shielding or light transmitting state of the grating 24 can be changed, thereby generating different light signals.

[0049] In one embodiment, the first end of the metal guide wire 16 is connected to a side of the control circuit board 13 away from the grating 24, and extends downward to between the shell 11 and the main body 17 after being bent. In this way, the contact area between the metal guide wire 16 and the shell 11 is large, making the arrangement of the metal guide wire 16 more compact and reasonable.

[0050] In one embodiment, the main body 17 is provided with a groove 25, which is formed by being recessed downward from the upper surface of the main body 17. The second end of the metal guide wire 16 and the housing 11 are located in the groove 25, and the second end of the metal guide wire 16 is clamped between the housing 11 and the inner wall of the groove 25 by interference fit, so that the second end of the metal guide wire 16 is better fixed. Figure 1 In the embodiment shown in FIG. 2 , the groove portion 25 is located at the outer edge of the main body portion 17 .

[0051] See also Figure 4 As shown, the present invention also provides an assembly method of an encoder 10, which is applied to the encoder 10 provided in the above-mentioned embodiment, and the assembly method includes the following steps:

[0052] S100 : welding the first end of the metal guide wire 16 to the control circuit board 13 .

[0053] S200: Assemble the control circuit board 13 above the core assembly 12 and bend the metal guide wire 16 to extend downward so that the metal guide wire 16 can be pressed against the surface of the main body 17 to ensure full contact between the metal guide wire 16 and the main body 17.

[0054] S300: The housing 11 is sleeved on the outside of the main body 17, and the position of the metal guide wire 16 is adjusted. The position of the metal guide wire 16 can be adjusted until the length of the contact point between the second end of the metal guide wire 16 and the main body 17 is greater than or equal to 2 mm.

[0055] S400: The main body 17 and the shell 11 are pressed together by a pressing device, so that the second end of the metal guide wire 16 is clamped between the shell 11 and the main body 17 by interference fit. The pressing device may be a clamp or a pressing device. In this way, the interference fit between the second end of the metal guide wire 16 and the gap can be further enhanced to ensure the connection stability of the second end of the metal guide wire 16. In this way, it can be ensured that the interference fit between the metal guide wire 16 and the gap is appropriate, neither too loose to cause poor contact, nor too tight to cause installation difficulties or damage the encoder components. During the entire installation process, the operating environment needs to be strictly controlled to prevent dust, moisture, etc. from having an adverse effect on the connection effect.

[0056] See also Figure 5 As shown, in one embodiment, the control circuit board 13 is provided with a solder pad hole.

[0057] Step S100 includes:

[0058] S101: Pass the first end of the metal guide wire 16 through the pad hole, wherein the length of the metal guide wire 16 passing through the pad hole is less than 0.8 mm.

[0059] S102: Under the set time, the solder wire introduced into the pad hole is melted by a welding device with a set temperature of 280°C to 320°C to weld the first end of the metal guide wire 16 to the control circuit board 13. The welding device may refer to an electric soldering iron. The set time is less than 3s. In this embodiment, the wire diameter of the solder wire is 0.5mm, and the use length of the solder wire is less than 3mm. In this way, damage to the control circuit board 13 can be prevented during the welding process, and a good electrical connection can be ensured between the first end of the metal guide wire 16 and the control circuit board 13.

[0060] In one embodiment, before step S200, the assembly method further includes: cleaning and treating the inner side of the shell 11 and the main body 17 to remove impurities and oxides on the surfaces of both, thereby improving the tightness and conductivity of the contact between the metal guide wire 16 and the shell 11 and between the metal guide wire 16 and the main body 17.

[0061] In one embodiment, after step S400, the assembly method further includes: measuring the resistance between the shielding wire 14 and the main body 17. If the measured resistance is less than 10Ω, the quality requirement is met. The resistance between the shielding wire 14 and the main body 17 can be measured by a multimeter. In this way, the resistance between the shielding wire 14 and the main body 17 can be measured to ensure that the connection quality of the metal guide wire 16 meets the quality requirement.

[0062] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the disclosure of the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0063] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An encoder, characterized in that: include: case; A core component, wherein the shell is sleeved on the outer side of the core component, and the core component includes a main body; A control circuit board is arranged above the core component and located inside the housing; A shielding wire and a signal wire, wherein a first end of the shielding wire and a first end of the signal wire are both connected to the control circuit board, and a second end of the shielding wire and a second end of the signal wire form a wire harness and extend outward; and A metal guide wire, wherein the first end of the metal guide wire is connected to the control circuit board and is electrically connected to the first end of the shielding wire through a wire in the control circuit board; the second end of the metal guide wire is clamped between the shell and the main body by interference fit, so that the shell is connected to the shielding wire through the metal guide wire.

2. The encoder according to claim 1, characterized in that The core component also includes a main shaft and a bearing; the main body includes a mounting cavity, the bearing is sleeved on the main shaft and fixed to the inner wall of the mounting cavity, and the bearing is used to enable the main shaft to rotate relative to the main body.

3. The encoder according to claim 2, characterized in that The core component also includes a light source and a grating. The grating is sleeved on the main shaft and located between the light source and the control circuit board. The light source is arranged on the main body and is arranged toward the grating.

4. The encoder according to claim 3, characterized in that The first end of the metal guide wire is connected to a side surface of the control circuit board away from the grating, and extends downward to between the shell and the main body after being bent.

5. The encoder according to claim 1, characterized in that The main body is provided with a groove portion, which is formed by being recessed downward from the upper surface of the main body; the second end of the metal guide wire and the shell are located in the groove portion, and the second end of the metal guide wire is clamped between the shell and the inner wall of the groove portion by interference fit.

6. The encoder according to claim 5, characterized in that The groove portion is located at an outer edge of the main body portion.

7. The encoder according to claim 1, characterized in that The diameter of the metal guide wire is 0.5 mm to 1 mm; and / or The length of the metal guide wire is 10 mm to 20 mm.

8. The encoder according to claim 1, characterized in that The length of the contact point between the second end of the metal guide wire and the main body is greater than or equal to 2 mm; and / or The distance between the first end of the metal guide wire and the first end of the shielding wire is less than or equal to 10 mm.

9. A method for assembling an encoder, characterized in that: Applied to an encoder as claimed in any one of claims 1 to 8, the assembly method comprises: Welding the first end of the metal guide wire to the control circuit board; Assembling the control circuit board above the core component, and bending the metal guide wire so that the metal guide wire extends downward; Sleeve the shell onto the outside of the main body, and adjust the position of the metal guide wire; The main body and the shell are pressed together by a pressing device so that the second end of the metal guide wire is clamped between the shell and the main body by interference fit.

10. The encoder assembly method according to claim 9, characterized in that: The control circuit board is provided with a pad hole; the first end of the metal guide wire is welded to the control circuit board, comprising: Pass the first end of the metal guide wire through the pad hole; wherein the length of the metal guide wire passing through the pad hole is less than 0.8 mm; At a set time, the solder wire introduced into the pad hole is melted by a soldering device with a set temperature of 280° C. to 320° C., so as to solder the first end of the metal guide wire to the control circuit board.

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