Servo motor encoder wire harness resistant to bending breakage

Abstract

The utility model belongs to servo motor accessories technical field, especially is a kind of servo motor encoder wire harness of bending fracture resistance, including cable body and connector, cable body includes flexible collet, metal wire core, inner protective sleeve, buffer sleeve and outer protective sleeve;Flexible collet is internally provided with the installation bin extending along its length direction, metal wire core is arranged in the installation bin;Metal wire core is made by multiple wire unit stranding;The "multiple tinned copper wire stranding+flexible silica gel tube inner support" structure of metal wire core, flexible stranding of flexible collet axle and the cooperation of conical transition sleeve and nylon bellows, from wire core to the all-around enhancement bending resistance of connecting end;The stress absorption of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance and impact resistance of the wear resistance of the wear resistance of the wear resistance of the wear resistance of the wear resistance of the wire harness service life;Multiple metal wire core is isolated independently by installation bin, avoid interference between wire core.

Description

Technical Field

[0001] This utility model belongs to the field of servo motor accessories technology, specifically relating to a servo motor encoder harness that is resistant to bending and breakage. Background Technology

[0002] The servo motor encoder harness is the core component connecting the encoder and the controller, and it needs to be bent frequently during motor operation or installation and debugging.

[0003] Existing wiring harnesses mostly use a single-strand copper conductor + single-layer PVC protective sheath structure, which has two major drawbacks: First, the single-strand conductor has poor flexibility and is prone to copper wire breakage after repeated bending, resulting in signal interruption; second, the single-layer protective sheath lacks buffering, and stress concentration between the conductor and the protective sheath during bending accelerates conductor wear and breakage.

[0004] To address the aforementioned issues, this application proposes a servo motor encoder harness that is resistant to bending and breakage. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides a servo motor encoder harness that is resistant to bending and breakage, and features convenient use and long service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a servo motor encoder harness resistant to bending and breakage, comprising a cable body and connectors connected to both ends of the cable body, wherein the cable body comprises a flexible sleeve, a metal wire core, an inner protective sleeve, a buffer sleeve, and an outer protective sleeve; The flexible jacket has an installation compartment extending along its length, and the metal wire core is disposed in the installation compartment. The metal wire core is made of multiple strands of conductor units twisted together, and each conductor unit is made of multiple strands of tin-plated copper wire twisted together. A flexible silicone tube is inserted inside the metal wire core. The inner protective sleeve is coaxially fitted onto the outside of the flexible jacket, the buffer sleeve is coaxially fitted onto the outside of the inner protective sleeve, and the outer protective sleeve is coaxially fitted onto the outside of the buffer sleeve.

[0007] Preferably, the flexible sleeve is made of silicone, and the flexible sleeve has a plurality of mounting chambers evenly distributed along the circumferential direction, with the plurality of metal wire cores respectively disposed in the mounting chambers.

[0008] Preferably, the inner protective sleeve is made of silicone with a wall thickness of 0.3mm-0.5mm, and tightly wraps around the flexible jacket.

[0009] Preferably, the buffer sleeve is made of foamed EVA with a wall thickness of 0.2mm-0.3mm, and tightly wraps around the inner protective sleeve.

[0010] Preferably, the outer protective sleeve is made of nylon with a wall thickness of 0.4mm-0.6mm, and tightly wraps around the buffer sleeve.

[0011] Preferably, the flexible jacket has a buffer cavity extending along its length at its axis, and a flexible stranded wire is provided in the buffer cavity, wherein the flexible stranded wire is made of multiple strands of silicone strips twisted together.

[0012] Preferably, a flexible transition sleeve is provided at the connection between the cable body and the connector. The flexible transition sleeve is a conical soft PVC component, and the large end of the flexible transition sleeve is fixed to the connector using hot melt adhesive.

[0013] Preferably, a flexible corrugated tube is coaxially sleeved at one end of the flexible transition sleeve away from the connector. The flexible corrugated tube is a nylon corrugated tube, and one end of the flexible corrugated tube is fixed to the flexible transition sleeve with hot melt adhesive, while the other end is fixed to the cable body with hot melt adhesive.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. The structure of "multi-strand tinned copper wire stranded + flexible silicone tube internal support" of the metal wire core, the flexible stranded wire of the flexible jacket shaft, and the combination of tapered transition sleeve and nylon corrugated tube enhance the bending resistance in all aspects from the wire core to the connection end. 2. The inner protective sleeve provides insulation and abrasion resistance, the buffer sleeve absorbs stress, and the outer protective sleeve provides abrasion and impact resistance, forming a three-layer protection system that effectively resists damage from the external environment and internal stress, extending the service life of the wire harness. 3. The multi-metal wire cores are independently isolated through the mounting compartment to avoid interference between the wire cores. The low resistance characteristics of the tinned copper wire ensure low signal transmission loss, which can meet the signal requirements of high-precision control of servo motors.

[0015] Other additional advantages and benefits of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial cross-sectional structural diagram of the cable body in this utility model; Figure 3 This is a schematic diagram of the isometric structure of the metal wire core in this utility model; Figure 4This is a schematic diagram of the isometric structure of the conductor unit in this utility model; Figure 5 This is a schematic diagram of the isometric structure of the flexible stranded wire in this utility model; Figure 6 This utility model Figure 1 A magnified structural diagram at point A in the diagram.

[0017] In the diagram: 1. Cable body; 11. Flexible sleeve; 111. Installation compartment; 112. Buffer chamber; 12. Metal wire core; 121. Conductor unit; 1211. Tinned copper wire; 122. Flexible silicone tube; 13. Inner protective sleeve; 14. Buffer sleeve; 15. Outer protective sleeve; 16. Flexible stranded wire; 161. Silicone strip; 2. Connector; 3. Flexible transition sleeve; 4. Flexible corrugated tube. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-6 The present invention provides the following technical solution: a servo motor encoder harness resistant to bending and breakage, comprising a cable body 1 and connectors 2 connected to both ends of the cable body 1. The cable body 1 includes a flexible sleeve 11, a metal wire core 12, an inner protective sleeve 13, a buffer sleeve 14, and an outer protective sleeve 15.

[0020] Furthermore, by Figures 1-4 As shown, in this embodiment, the flexible sleeve 11 has an installation chamber 111 extending along its length, and the metal wire core 12 is disposed in the installation chamber 111. The metal wire core 12 is made of multiple strands of conductor units 121 twisted together, and each conductor unit 121 is made of multiple strands of tin-plated copper wire 1211 twisted together. A flexible silicone tube 122 is inserted into the metal wire core 12. The inner protective sleeve 13 is coaxially sleeved on the outside of the flexible sleeve 11, the buffer sleeve 14 is coaxially sleeved on the outside of the inner protective sleeve 13, and the outer protective sleeve 15 is coaxially sleeved on the outside of the buffer sleeve 14.

[0021] In this embodiment, the flexible sleeve 11 is made of silicone material, and multiple mounting chambers 111 are provided in the flexible sleeve 11 at equal intervals along the circumferential direction. Multiple metal wire cores 12 are respectively disposed in the mounting chambers 111. After adopting the above scheme, the metal wire cores 12 adopt a "multi-strand conductor unit 121 twisted" structure, and each conductor unit 121 is further made of multiple strands of tin-plated copper wire 1211 twisted together. The tin-plated copper wire 1211 has both excellent conductivity and oxidation resistance, which can reduce resistance loss and contact corrosion during signal transmission. Compared with single-strand hard wire, the "multi-strand twisted" form can significantly improve the flexibility of the metal wire core 12, avoid wire breakage caused by local stress concentration when bending, and ensure that the current / signal is evenly distributed in the multi-strand conductor unit 121, reducing signal attenuation.

[0022] The flexible silicone tube 122 inserted inside the metal core 12 can, on the one hand, fill the gaps after the metal core 12 is twisted together by its own elasticity, preventing the conductor unit 121 from becoming loose or misaligned during bending and vibration, and maintaining the overall structural integrity of the metal core 12; on the other hand, it can absorb the small deformation stress inside the metal core 12, avoid fatigue fracture of the tinned copper wire 1211 due to long-term repeated bending, and further extend the service life of the metal core 12.

[0023] The flexible jacket 11 is made of silicone, which has high elasticity and low creep properties. It can quickly recover its original shape after bending, reducing structural fatigue caused by long-term deformation. At the same time, multiple installation compartments 111 evenly distributed along the circumference inside the flexible jacket 11 independently separate multiple metal wire cores 12. This can avoid insulation layer damage or wire wear caused by mutual squeezing and friction between the metal wire cores 12 during bending. It also ensures that the bending stress of each metal wire core 12 is evenly distributed to the flexible jacket 11, preventing a single metal wire core 12 from breaking due to excessive local stress.

[0024] Furthermore, in this embodiment, the inner protective sleeve 13 is made of silicone with a wall thickness of 0.3mm-0.5mm, tightly wrapping the flexible sleeve 11 without any gaps between them. On the one hand, this can effectively limit the radial offset and axial movement of the flexible sleeve 11 (the servo motor has high-frequency vibration during operation, which can easily lead to the displacement of loose structures), ensuring that the mounting chambers 111 inside the flexible sleeve 11 are always evenly distributed around the circumference, avoiding deformation of the mounting chambers 111 and compression of the internal metal wire core 12 due to the offset of the flexible sleeve 11. On the other hand, the micro-elasticity of the silicone material allows the inner protective sleeve 13 to deform synchronously with the bending of the flexible sleeve 11, forming a "flexible bond". This does not hinder the elastic recovery of the flexible sleeve 11, and also prevents the silicone wear caused by relative friction between the flexible sleeve 11 and the inner protective sleeve 13, thus extending the life of the inner structure.

[0025] Furthermore, in this embodiment, the buffer sleeve 14 is made of foamed EVA with a wall thickness of 0.2mm-0.3mm, tightly wrapping the inner protective sleeve 13. The foamed EVA has a closed-cell micro-foamed morphology inside, and its core advantage lies in its high deformation energy absorption efficiency. When the wire harness is subjected to the impact stress generated by the high-frequency vibration or bending transmitted by the servo motor, the buffer sleeve 14 can convert the concentrated stress into bubble deformation energy through the "compression-rebound" deformation of the internal micro-bubbles, thus achieving "step-by-step attenuation".

[0026] For high-frequency vibration, microbubbles can absorb vibration energy through high-frequency reciprocating deformation, avoiding direct transmission of vibration to the inner protective sleeve 13 and flexible jacket 11, and reducing the loosening or fatigue of the tinned copper wire 1211 caused by long-term vibration of the metal wire core 12. To address bending stress, the outer side of the buffer sleeve 14 is under tension and the inner side is under compression during bending. The micro-foamed structure can disperse localized concentrated stress (such as stress at the bending inflection point) through asymmetric deformation of unilateral bubble stretching and unilateral bubble compression, preventing stress from penetrating to the inner structure and reducing the deformation load of the inner protective sleeve 13 and the flexible jacket 11.

[0027] Furthermore, in this embodiment, the outer protective sleeve 15 is made of nylon with a wall thickness of 0.4mm-0.6mm, tightly wrapping the buffer sleeve 14. Servo motors are mostly used in industrial scenarios such as machine tools and automated equipment. The wiring harness is easily exposed to metal shavings, oil, coolant, and frequent friction. Nylon has better surface hardness and wear resistance than inner layer materials such as silicone and foamed EVA. The 0.4mm-0.6mm wall thickness can form a stable "wear-resistant barrier" to avoid damage to the outer layer caused by scratches from metal shavings and friction from pipelines, and to prevent the inner buffer sleeve 14 and inner protective sleeve 13 from being exposed and damaged.

[0028] Nylon can withstand common industrial mineral oils, coolants, and certain temperature fluctuations. It can prevent oil from penetrating into the buffer sleeve 14, avoid elastic failure of foamed EVA due to oil corrosion, and prevent the outer layer from becoming brittle or softened due to high or low temperatures, thus maintaining long-term protective performance.

[0029] When the wiring harness is subjected to a minor impact (such as an accidental collision during equipment debugging), the rigidity of the nylon can directly resist the impact, prevent the impact force from penetrating to the buffer sleeve 14, reduce the deformation load of the buffer sleeve 14, and indirectly protect the inner structure.

[0030] Preferably, by Figure 1 , Figure 2 and Figure 5As shown in this embodiment, a buffer cavity 112 extending along its length is provided at the axis of the flexible jacket 11. A flexible stranded wire 16 is provided in the buffer cavity 112, and the flexible stranded wire 16 is made of multiple strands of silicone strips 161 twisted together. With the above solution, when the wire harness is bent, a stress distribution of "external stretching, internal compression, and central neutral layer" will be formed. Although the neutral layer is theoretically not significantly stretched or compressed, in actual bending, due to the deformation transmission of each layer structure, "stress superposition" is likely to occur (such as the wire core stress in the circumferential mounting chamber 111 being transmitted to the axis), which can easily lead to cracking at the axis of the flexible jacket 11 in the long term.

[0031] The design of the buffer cavity 112 provides a "deformation release space" for the shaft center area. When bending stress is transmitted to the shaft center, the buffer cavity 112 can absorb part of the shaft center stress by slightly contracting (when bending inward) or expanding (when bending outward), thus avoiding stress concentration at the shaft center of the flexible jacket 11. At the same time, the buffer cavity 112 can balance the force on the circumferential mounting chamber 111. When multiple metal wire cores 12 generate radial pressure due to bending, the buffer cavity 112 can offset part of the pressure through spatial deformation, preventing the flexible jacket 11 from deforming as a whole due to excessive circumferential pressure, ensuring the stability of the mounting chamber 111, and avoiding damage to the metal wire cores 12 due to compression.

[0032] The flexible stranded wire 16, through the elastic support of its own stranded structure, can maintain the cross-sectional shape of the buffer cavity 112, and deform synchronously with the bending of the flexible jacket 11 (such as the slight twisting of the flexible stranded wire 16 when bending), which not only does not hinder the deformation of the flexible jacket 11, but also prevents the structure of the axial region from becoming loose.

[0033] When bending, the deformation of the flexible sleeve 11 can be transmitted to the flexible stranded wire 16 through the inner wall of the buffer cavity 112. The flexible stranded wire 16 bends synchronously with the flexible sleeve 11, avoiding relative friction caused by the material difference that results in "the flexible sleeve 11 deforms while the flexible stranded wire 16 does not move", thus reducing the wear of the inner wall of the buffer cavity 112.

[0034] When the deformation is restored, the flexible sleeve 11 and the flexible stranded wire 16 rebound together, ensuring that the flexible sleeve 11 quickly returns to its original shape, avoiding permanent deformation of the flexible stranded wire 16 due to the lag in the rebound of the core stranded wire, and extending the service life of the flexible stranded wire 16.

[0035] Preferably, by Figure 1 and Figure 6As shown in this embodiment, a flexible transition sleeve 3 is fitted at the connection between the cable body 1 and the connector 2. The flexible transition sleeve 3 is a conical soft PVC component, and the large end of the flexible transition sleeve 3 is fixed to the connector 2 with hot melt adhesive. A flexible corrugated tube 4 is coaxially fitted at the end of the flexible transition sleeve 3 away from the connector 2. The flexible corrugated tube 4 is a nylon corrugated tube, and one end of the flexible corrugated tube 4 is fixed to the flexible transition sleeve 3 with hot melt adhesive, and the other end is fixed to the cable body 1 with hot melt adhesive. With the above solution, the flexible transition sleeve 3 uses the micro-elasticity of PVC material to fit the outer wall of the connector 2, avoiding sudden changes in local stress caused by the excessive rigidity of the connector 2. At the same time, the conical flared shape can disperse the concentrated stress transmitted by the connector 2 in the circumferential direction, avoiding the stress from acting directly on the cable connection point.

[0036] When bent, the flexible transition sleeve 3 can bend synchronously with the cable body 1. Its conical sidewall absorbs some of the stress at the joint through slight stretching or compression deformation, preventing stress from being transmitted to the internal metal core 12. At the same time, the fatigue resistance of PVC material can withstand the frequent bending of the servo motor, solving the problem of easy cracking of traditional rigid connection sleeves.

[0037] In addition, when bending, the crests and troughs of the corrugations can absorb residual stress at the joint by deforming "towards each other (inner side) or away from each other (outer side)," thus preventing stress from being directly transmitted to the outer protective sleeve 15 of the cable body 1. At the same time, the corrugated structure can increase the bending angle tolerance at the joint, so that even small-radius bends will not result in "hard bends," making it suitable for complex bending scenarios during servo motor debugging.

[0038] Components not described in detail in this article are existing technologies.

[0039] The working principle and usage process of this utility model: When using the servo motor encoder harness of this utility model, the signal transmission interface of the servo motor encoder and the servo driver is connected through the connectors 2 at both ends of the cable body 1. The metal core 12 adopts a "multi-strand conductor unit 121 twisted" structure, and each conductor unit 121 is further made of multiple strands of tin-plated copper wire 1211 twisted together. The tin-plated copper wire 1211 has both excellent conductivity and oxidation resistance, which can reduce resistance loss and contact corrosion during signal transmission. Compared with single-strand solid wire, the "multi-strand twisted" form can significantly improve the flexibility of the metal core 12, avoid conductor breakage caused by local stress concentration when bending, and ensure that the current / signal is evenly distributed in the multi-strand conductor unit 121, reducing signal attenuation. The outer protective sleeve 15 first resists friction, impact and oil stains, and transfers the residual impact stress to the buffer sleeve 14. The buffer sleeve 14 absorbs vibration and bending stress through micro-foaming deformation, and the remaining stress is transferred to the inner protective sleeve 13 along the tightly wrapped surface. The inner protective sleeve 13 evenly distributes the stress to the flexible sleeve 11 and fixes the position of the flexible sleeve 11 and the metal wire core 12. The flexible sleeve 11 separates the metal wire core 12 through the installation chamber 111. The shaft buffer cavity 112 absorbs the stress transmitted to the shaft. The flexible stranded wire 16 supports the shaft structure and attenuates high-frequency vibration, thus preventing the flexible sleeve 11 from cracking or the metal wire core 12 from being squeezed. When stress is transmitted to the junction of the cable body 1 and the connector 2, the flexible transition sleeve 3 disperses the concentrated stress through the rigid gradient, the flexible corrugated tube 4 absorbs the residual stress through corrugated deformation, and the hot melt adhesive fixation ensures no displacement friction and ensures safety. Ultimately, under multi-layer protection, the metal core 12 maintains the structural integrity and conductivity of the tinned copper wire 1211, stably transmitting the encoder's speed and position signals to the controller without attenuation or interruption.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A servo motor encoder harness resistant to bending and breakage, comprising a cable body (1) and connectors (2) connected to both ends of the cable body (1), characterized in that: The cable body (1) includes a flexible jacket (11), a metal wire core (12), an inner protective sleeve (13), a buffer sleeve (14), and an outer protective sleeve (15). The flexible jacket (11) has an installation compartment (111) extending along its length, and the metal wire core (12) is disposed in the installation compartment (111); The metal core (12) is made of multiple strands of conductor units (121) twisted together. Each conductor unit (121) is made of multiple strands of tin-plated copper wire (1211) twisted together. A flexible silicone tube (122) is inserted inside the metal core (12). The inner protective sleeve (13) is coaxially sleeved on the outside of the flexible jacket (11), the buffer sleeve (14) is coaxially sleeved on the outside of the inner protective sleeve (13), and the outer protective sleeve (15) is coaxially sleeved on the outside of the buffer sleeve (14).

2. The servo motor encoder harness resistant to bending and breakage according to claim 1, characterized in that: The flexible sleeve (11) is made of silicone. The flexible sleeve (11) has multiple installation chambers (111) that are equally spaced along the circumferential direction. The multiple metal wire cores (12) are respectively disposed in the installation chambers (111).

3. The servo motor encoder harness resistant to bending and breakage according to claim 1, characterized in that: The inner protective sleeve (13) is made of silicone with a wall thickness of 0.3mm-0.5mm, and tightly wraps the flexible jacket (11).

4. The servo motor encoder harness resistant to bending and breakage according to claim 1, characterized in that: The buffer sleeve (14) is made of foamed EVA with a wall thickness of 0.2mm-0.3mm, and tightly wraps the inner protective sleeve (13).

5. A servo motor encoder harness resistant to bending and breakage according to claim 1, characterized in that: The outer protective sleeve (15) is made of nylon with a wall thickness of 0.4mm-0.6mm, and tightly wraps the buffer sleeve (14).

6. The servo motor encoder harness resistant to bending and breakage according to claim 1, characterized in that: The flexible jacket (11) has a buffer cavity (112) extending along its length at its axis. A flexible stranded wire (16) is provided in the buffer cavity (112), and the flexible stranded wire (16) is made of multiple strands of silicone strips (161) twisted together.

7. A servo motor encoder harness resistant to bending and breakage according to claim 1, characterized in that: A flexible transition sleeve (3) is provided at the connection between the cable body (1) and the connector (2). The flexible transition sleeve (3) is a conical soft PVC component, and the large end of the flexible transition sleeve (3) is fixed to the connector (2) with hot melt adhesive.

8. A servo motor encoder harness resistant to bending and breakage according to claim 7, characterized in that: The flexible transition sleeve (3) is coaxially fitted with a flexible corrugated tube (4) at one end away from the connector (2). The flexible corrugated tube (4) is a nylon corrugated tube, and one end of the flexible corrugated tube (4) is fixed to the flexible transition sleeve (3) with hot melt adhesive, and the other end is fixed to the cable body (1) with hot melt adhesive.

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