An industrial super flexible servo cable

Abstract

The application discloses an industrial super-soft servo cable and relates to the technical field of cables.The cable comprises a sheath, further comprises a composite shielding layer, and the composite shielding layer is arranged on the inner wall of the sheath and comprises an aluminum foil shielding layer and a braided shielding layer; a plurality of conductive cable cores and one control cable core are arranged in the composite shielding layer in a ring array.The application cooperates with the buffer and the limiting piece arranged in the cable and other devices, effectively avoids the problem that the sheath is damaged at the bending position due to the additional force applied by the internal components when the sheath is bent, the conductive cable core and the control cable core are in flexible contact with the composite shielding layer through the buffer, the cable is easier to bend, the bending angle is much larger than that of an ordinary cable, and the flexibility of the cable is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to an industrial super-soft servo cable. BACKGROUND

[0002] At present, the degree of industrial automation and intelligence in China is increasing, and the performance requirements for motors are also increasing. Not only is the stability high, but the regulation is also very accurate. Servo motors increase the encoder, controller and other components that ordinary motors do not have, which can accurately control position, speed and acceleration, and the output precision is very high, which makes the servo motor become the ideal choice for occasions that require high-precision position control. As the perfect combination of servo cable and servo motor, it greatly improves the working efficiency of servo motor. Industrial servo cable needs to have a series of unique characteristics such as high flexibility, wear resistance, oil resistance, bending resistance and anti-interference because of its use occasion.

[0003] A servo motor dynamic cable is disclosed in Chinese Patent No. 201910859872.6, which comprises a cable core and an outer sheath extruded outside the cable core. The cable core comprises a signal line unit, a conductive unit and a cable core shielding layer, and the cable core shielding layer envelopes the signal line unit and the conductive unit. The signal line unit comprises a pair of signal transmission lines and an inner shielding sleeve, and the pair of signal transmission lines are located in the inner shielding sleeve. The cable has ideal softness, improves the anti-pulling ability, and embodies good anti-rolling and improves the construction efficiency.

[0004] A servo cable is disclosed in Chinese Patent No. 201910687000.6, which comprises a cable body, a sheath layer provided on the outer circumferential surface of the cable body, and a plurality of aramid filaments provided on the sheath layer. Each aramid filament extends along the axial direction of the sheath layer, and the plurality of aramid filaments are arranged in the circumferential direction of the sheath layer. The servo cable extrudes aramid filaments in the sheath to enhance the tensile strength of the sheath, avoiding safety hazards caused by sheath rupture during repeated movement of the servo cable.

[0005] Similar to the servo cable in the prior art described above, due to the limitation of the working site, the cable needs to be bent to change the laying path of the cable to avoid equipment during cable wiring. However, the fatigue strength of the sheath at the bending part of the cable will be damaged under the action of repeated stress concentration changes, losing the protection effect on the internal cable.

[0006] In addition, when the above-mentioned servo cable catches fire due to internal factors such as short circuit during use, the above-mentioned cable cannot achieve rapid fire extinguishing and effective isolation of the cable core in the fire area.

[0007] Therefore, it is necessary to provide an industrial super-soft servo cable to solve the above problems. SUMMARY

[0008] The present application aims to provide an industrial super-soft servo cable to solve the problems in the background art.

[0009] To achieve the above object, the present application provides the following technical scheme: an industrial super-soft servo cable comprising a sheath, the cable further comprising:

[0010] A composite shielding layer is arranged on the inner wall of the sheath, and the composite shielding layer comprises an aluminum foil shielding layer and a braided shielding layer.

[0011] A plurality of conductive cable cores and one control cable core are arranged in a ring array in the composite shielding layer.

[0012] A filling part is arranged in the central region of the inner cavity of the sheath, and the filling part comprises a plurality of limiting members arranged between adjacent two conductive cable cores and between the control cable core and the conductive cable core, and each limiting member is provided with a buffer member at one end close to the composite shielding layer, which can deform when the cable is bent and cooperate with the limiting member to reduce the internal force generated when the cable is bent.

[0013] Preferably, the filling part further comprises a plurality of communication members arranged in a ring array in the central region of the sheath, and adjacent two communication members form a communication groove, and a plurality of connecting members are fixedly connected in the communication groove, and adjacent two communication members are connected through a plurality of connecting members.

[0014] Preferably, each communication member is fixedly connected with a partition plate at one end close to the center of the sheath, and adjacent two partition plates are connected through a diaphragm, and a plurality of diaphragms divide the communication member into a communication cavity close to the center of the sheath and a plurality of adjusting cavities separated by a plurality of partition plates away from the center of the sheath.

[0015] Preferably, two expansion members are symmetrically arranged on each communication member, and the conductive cable core and the control cable core are fixedly connected with the communication member through the expansion members, and each expansion member penetrates the communication member at one end close to the communication member and communicates with different adjusting cavities.

[0016] Preferably, each communication member is fixedly connected with a partition plate at one end close to the center of the sheath, and adjacent two partition plates are connected through a diaphragm, and a plurality of diaphragms divide the communication member into a communication cavity close to the center of the sheath and a plurality of adjusting cavities separated by a plurality of partition plates away from the center of the sheath.

[0017] Preferably, the buffer is a hollow structure, and an extension is arranged at one end of the inner cavity of the buffer close to the limiting member, one end of the extension is in communication with the inside of the buffer, the other end of the extension penetrates through the limiting member and is fixedly connected with the side wall of the communication member, and the extension can be elongated and shortened according to the change of the air pressure in the adjusting cavity.

[0018] Preferably, the buffer and the adjusting cavity are filled with a gas with fire extinguishing ability and capable of thermal expansion.

[0019] Preferably, the braided shielding layer is attached to the inner wall of the sheath, and the braided shielding layer is composed of fine tinned copper wires with a braiding angle of 40-50° and a braiding density of 80-90%, and the aluminum foil shielding layer is attached to the inner wall of the braided shielding layer.

[0020] Preferably, the conductive cable core comprises conductive wires, and a first insulating sleeve is jointly sleeved outside the conductive wires in the same conductive cable core which are connected together by composite twisting, the control cable core comprises control wires and two second insulating sleeves, and the conductive wires and the control wires are made of tinned oxygen-free copper.

[0021] Preferably, the two second insulating sleeves are symmetrically arranged, and each of the second insulating sleeves is filled with a plurality of control wires connected together by composite twisting, the outer sides of the two second insulating sleeves are provided with a shielding layer with the same structure as the composite shielding layer, and the two second insulating sleeves are arranged in the shielding layer.

[0022] Technical effects and advantages of the present application:

[0023] 1. By cooperating the buffer and the limiting member and other devices arranged inside the cable, the present application effectively avoids the problem that the sheath is damaged at the bending part due to the additional force exerted by the internal components when the sheath is bent, and since the conductive cable core and the control cable core are in flexible contact with the composite shielding layer through the buffer, the cable is more easily bent, and the bending angle is much larger than that of ordinary cables, further improving the flexibility of the cable.

[0024] 2. By cooperating the buffer and the telescopic member, the present application changes the positions of the conductive cable core and the control cable core, avoids heat concentration, and further improves the heat dissipation effect through the contact with the aluminum foil shielding layer, and the fire-extinguishing gas arranged in the adjusting cavity is ejected outwardly through the buffer under the action of air pressure to quickly extinguish the burning area. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0026] Figure 2It is a schematic diagram of the composite shielding layer structure of the present application.

[0027] Figure 3 It is a schematic diagram of the conductive cable core structure of the present application.

[0028] Figure 4 It is a schematic diagram of the control cable core structure of the present application.

[0029] Figure 5 It is a schematic diagram of the filling part structure of the present application.

[0030] Figure 6 It is a schematic diagram of the communication part structure of the present application.

[0031] Figure 7 It is a schematic diagram of the connection structure of the communication part and the limiting part of the present application.

[0032] In the figure: 1, sheath; 2, composite shielding layer; 21, aluminum foil shielding layer; 22, braided shielding layer; 3, conductive cable core; 31, conductive wire; 4, control cable core; 41, control wire; 5, filling part; 51, limiting part; 52, communication part; 53, buffer part; 54, connecting part; 55, partition; 56, diaphragm; 57, telescopic part; 58, expansion part; 59, extension part; 6, first insulating sleeve; 7, second insulating sleeve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In order to improve the anti-interference and bending ability of the servo cable, as shown in the first embodiment of the present application, an ultra-soft servo cable for industrial use is provided, which comprises a sheath 1. The sheath 1 is made of a special modified oil-proof flame-retardant PVC sheath which can pass the VW-1 flame retardant test. The sheath 1 made of this material is suitable for working in an environment with frequent movement and friction, thereby avoiding the problem of damage of the cable during dragging. Figure 1 Figure 4

[0035] ​​In this embodiment, the cable further includes a composite shielding layer 2, which is disposed on the inner wall of the sheath 1. The composite shielding layer 2 includes an aluminum foil shielding layer 21 and a braided shielding layer 22. The braided shielding layer 22 is attached to the inner wall of the sheath 1 and is composed of fine tin-plated copper wires braided at an angle of 40° to 50° and a braiding density of 80% to 90%. The aluminum foil shielding layer 21 is attached to the inner wall of the braided shielding layer 22. The composite shielding layer 2 can effectively avoid external interference and ensure the stability and accuracy of signal transmission.

[0036] In this embodiment, the cable also includes a conductor core 3 and a control core 4. Multiple conductor cores 3 and one control core 4 are arranged in a ring array within the composite shielding layer 2. The conductor core 3 includes a conductive wire 31. Multiple strands of conductive wire 31 within the same conductor core 3 are connected together by composite twisting and are collectively sleeved with a first insulating sleeve 6. The control core 4 includes a control wire 41 and two second insulating sleeves 7. Both the conductive wire 31 and the control wire 41 are made of tin-plated oxygen-free copper.

[0037] By bundling multiple sets of conductive wires 31 and control wires 41 separately and then performing composite stranding, while ensuring that the stranding direction of the bundled strands and the composite stranding is the same, the flexibility of the cable is effectively improved and the bending radius of the cable is reduced. This structure not only has good conductivity but also enhances the corrosion resistance of the cable.

[0038] In this embodiment, two second insulating sleeves 7 are arranged symmetrically, and each second insulating sleeve 7 is filled with multiple strands of control wires 41 connected together by a composite hinge. The outer side of the two second insulating sleeves 7 is provided with a shielding layer with the same structure as the composite shielding layer 2, and the two second insulating sleeves 7 are disposed inside the shielding layer. The double shielding of the control cable core 4 is achieved by the shielding layer sleeved on the outer side of the second insulating sleeves 7 and the composite shielding layer 2 connected to the sheath 1, which further improves the anti-interference ability of the cable and allows the cable to continue to work in complex environments.

[0039] like Figure 5 As shown, to prevent the sheath 1 from being damaged after the cable is bent, in another embodiment of the present invention, the cable further includes a filling part 5. The filling part 5 is disposed in the central region of the inner cavity of the sheath 1. The filling part 5 includes a limiting member 51. Multiple limiting members 51 are disposed between two adjacent conductor cores 3 and between the control core 4 and the conductor core 3. Each limiting member 51 has a buffer member 53 at one end near the composite shielding layer 2. The buffer member 53 can deform when the cable is bent and cooperate with the limiting member 51 to reduce the internal force generated when the cable is bent.

[0040] In the embodiment, the buffer 53 is a hollow structure, and an inner cavity of the buffer 53 is provided with an extension piece 59 close to one end of the limiting piece 51, one end of the extension piece 59 is in communication with the inside of the buffer 53, the other end of the extension piece 59 penetrates through the limiting piece 51 and is fixedly connected with the side wall of the communication piece 52, and the extension piece 59 can be elongated and shortened according to the change of the air pressure in the adjusting cavity.

[0041] When it is necessary to bend the cable at a certain position, at this time, the buffer 53 inside the cable at the region will be affected by external force and move towards the composite shielding layer 2, in this state, the gas in the buffer 53 moves to the inside of the communication piece 52 through the extension piece 59, and diffuses the gas at this position to the region which is not bent through the communication piece 52, so as to slow down the force applied to the sheath 1 by the internal components of the cable when being bent, effectively avoiding the problem that the sheath 1 is damaged at the bent position due to the additional force applied by the internal components when being bent, and at the same time, the buffer 53 and the limiting piece 51 are arranged to fix the conductive cable core 3 and the control cable core 4 on one hand, preventing the conductive cable core 3 and the control cable core 4 from being self-wound and deviated after being bent and pulled for many times, and on the other hand, since the conductive cable core 3 and the control cable core 4 are in flexible contact with the composite shielding layer 2 through the buffer 53, the cable is more easily bent, and the bending angle is much larger than that of the ordinary cable, further improving the flexibility of the cable.

[0042] As shown in Figure 6 Figure 7 In order to improve the heat dissipation effect of the cable and quickly extinguish the fire of the cable, in another embodiment of the present application, the filling part 5 further comprises a communication piece 52, a plurality of communication pieces 52 are arranged in an annular array in the central region of the sheath 1, two adjacent communication pieces 52 form a communication groove therebetween, and a plurality of connecting pieces 54 are fixedly connected in the communication groove, the two adjacent communication pieces 52 are connected through the plurality of connecting pieces 54, and the end of the extension piece 59 connected with the communication piece 52 is provided with a mounting groove matched with the connecting piece 54, so that the end of the extension piece 59 is fixedly connected with the communication piece 52 through the connecting piece 54.

[0043] In the embodiment, one baffle 55 is fixedly connected to each communication piece 52 close to the center of the sheath 1, two adjacent baffles 55 are connected through a diaphragm 56, and the communication piece 52 is divided into a communication cavity close to the center of the sheath 1 and a plurality of adjusting cavities far away from the center of the sheath 1 and divided by the plurality of baffles 55.

[0044] Two extension pieces 57 are symmetrically arranged on each communication piece 52, the conductive cable core 3 and the control cable core 4 are fixedly connected with the communication piece 52 through the extension pieces 57, and one end of each extension piece 57 penetrates through the communication piece 52 and communicates with different adjusting cavities.​

[0045] The two ends of the two adjacent communicating members 52 are fixedly connected with an expansion member 58 respectively, the expansion member 58 can expand and elongate according to the temperature rise, the ends of the two adjacent expansion members 58 away from the communicating member 52 are fixedly connected with the same limiting member 51, and the buffer member 53 and the adjusting cavity are filled with gas with fire extinguishing ability and capable of thermal expansion.

[0046] In use, when the cable is powered for a long time and starts to heat up, the temperature of the conductive cable core 3 and the control cable core 4 will gradually rise. Since the conductive cable core 3 and the control cable core 4 are connected to the communicating member 52 through multiple expansion members 57, under the action of heat conduction, the gas in the adjusting cavity can expand and push the expansion member 57 to elongate. At the same time, since the expansion member 58 is also filled with a thermal expansion gas, and the thermal expansion coefficient of the gas in the expansion member 58 is higher than that of the gas in the adjusting cavity, when the conductive cable core 3 and the control cable core 4 start to heat up, the expansion member 58 will first expand and elongate, pushing the limiting member 51 to move towards the sheath 1, thereby releasing the limiting of the conductive cable core 3 and the control cable core 4 and providing space for the displacement of the conductive cable core 3 and the control cable core 4. At the same time, since the buffer member 53 is in contact with the composite shielding layer 2 arranged inside the sheath 1 in the initial state, when the limiting member 51 moves the buffer member 53 towards the sheath 1, the gas in the buffer member 53 will move into the adjusting cavity, and under the action of heat conduction, part of the gas will push the diaphragm 56 to move towards the middle of the sheath 1, and the other part of the gas will elongate the expansion member 57, thereby moving the multiple conductive cable cores 3 and control cable cores 4 away from each other, effectively solving the problem of heat concentration caused by the close proximity of the conductive cable core 3 and the control cable core 4, and poor heat dissipation.

[0047] At the same time, as the conductive cable core 3 and the control cable core 4 continue to heat up, the elongation of the expansion member 57 will gradually increase, thereby pushing the conductive cable core 3 and the control cable core 4 into contact with the aluminum foil shielding layer 21 arranged in the sheath 1. At this time, the aluminum foil shielding layer 21 is in contact with the conductive cable core 3 and the control cable core 4, thereby conducting the second-order heat dissipation of the conductive cable core 3 and the control cable core 4, and further improving the heat dissipation effect of the cable by changing the heat dissipation conductor.

[0048] Moreover, since the heat generation of each conductive cable core 3 and control cable core 4 is different, and the multiple adjusting cavities are sealed from each other, the device can control the movement and heat dissipation of the conductive cable core 3 and the control cable core 4 to different degrees according to the heat generation of each conductive cable core 3 and control cable core 4.

[0049] When the conductive cable core 3 or the control cable core 4 is internally on fire due to short circuit or other factors at somewhere of the cable, since the conductive cable core 3 and the control cable core 4 are arranged in the aluminum foil shielding layer 21, and the aluminum foil shielding layer 21 has good fire resistance, the fire will spread to the buffer 53 and burn the buffer 53, when the buffer 53 is burnt, the fire extinguishing gas arranged in the adjusting cavity is sprayed outwards through the buffer 53 under the action of air pressure, and the burning area is quickly extinguished.

[0050] It should be particularly pointed out that, by controlling the cooperation of the buffer 53 and the limiting piece 51 and other devices arranged in the cable, the problem that the sheath 1 is damaged at the bending position due to the additional force applied by the internal components when the sheath 1 is bent is effectively avoided, and since the conductive cable core 3 and the control cable core 4 are in flexible contact with the composite shielding layer 2 through the buffer 53, the cable is more easily bent, and the bending angle is much larger than that of the ordinary cable, the flexibility of the cable is further improved, and by the cooperation of the buffer 53 and the telescopic piece 57 and other devices, the positions of the conductive cable core 3 and the control cable core 4 are changed, the heat is avoided from being concentrated, the heat dissipation effect is further improved by the contact with the aluminum foil shielding layer 21, and the fire extinguishing gas arranged in the adjusting cavity is sprayed outwards through the buffer 53 under the action of air pressure, the burning area is quickly extinguished.

[0051] Finally, it should be pointed out that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An industrial ultra-flexible servo cable, comprising a sheath (1), characterized in that, The cable also includes: A composite shielding layer (2) is disposed on the inner wall of the sheath (1). The composite shielding layer (2) includes an aluminum foil shielding layer (21) and a braided shielding layer (22). The conductor core (3) and the control core (4) are arranged in a ring array within the composite shielding layer (2); The filling part (5) is located in the central area of ​​the inner cavity of the sheath (1). The filling part (5) includes a limiting member (51). Multiple limiting members (51) are located between two adjacent conductor cores (3) and between the control core (4) and the conductor core (3). Each limiting member (51) has a buffer member (53) at one end near the composite shielding layer (2). The buffer member (53) can deform when the cable is bent and cooperate with the limiting member (51) to reduce the internal force generated when the cable is bent. The filling part (5) also includes a connecting member (52). A plurality of the connecting members (52) are arranged in a ring array in the central area of ​​the sheath (1). A connecting groove is formed between two adjacent connecting members (52), and a plurality of connecting members (54) are fixedly connected in the connecting groove. Two adjacent connecting members (52) are connected by a plurality of connecting members (54). Each of the connecting parts (52) has a partition (55) fixedly connected to one end near the center of the sheath (1). Two adjacent partitions (55) are connected by a diaphragm (56). The multiple diaphragms (56) divide the interior of the connecting part (52) into a connecting cavity near the center of the sheath (1) and multiple adjustment cavities away from the center of the sheath (1) and separated by multiple partitions (55). Two telescopic members (57) are symmetrically arranged on each of the connecting members (52). The conductor cable core (3) and the control cable core (4) are fixedly connected to the connecting member (52) through the telescopic members (57). The end of each telescopic member (57) close to the connecting member (52) passes through the connecting member (52) and is connected to different adjustment chambers.

2. The servo cable according to claim 1, characterized in that: An expansion member (58) is fixedly connected to each end of two adjacent connecting members (52) that are close to each other. The expansion member (58) can expand and elongate according to the increase of temperature. The ends of the two adjacent expansion members (58) that are away from the connecting member (52) are fixedly connected to the same limiting member (51).

3. The servo cable according to claim 1, characterized in that: The buffer (53) is a hollow structure, and an extension (59) is provided at one end of the inner cavity of the buffer (53) near the limiting member (51). One end of the extension (59) is connected to the inside of the buffer (53), and the other end of the extension (59) passes through the limiting member (51) and is fixedly connected to the side wall of the connecting member (52). The extension (59) can be extended and shortened according to the change of air pressure in the regulating cavity.

4. The servo cable according to claim 1, characterized in that: Both the buffer (53) and the regulating cavity are filled with a gas that has fire extinguishing capabilities and can undergo thermal expansion.

5. The servo cable according to claim 1, characterized in that: The braided shielding layer (22) is attached to the inner wall of the sheath (1), and the braided shielding layer (22) is made of fine tin-plated copper wire, with a braiding angle of 40° to 50° and a braiding density of 80% to 90%. The aluminum foil shielding layer (21) is attached to the inner wall of the braided shielding layer (22).

6. The servo cable according to claim 1, characterized in that: The conductor core (3) includes a conductive wire (31). Multiple strands of conductive wire (31) in the same conductor core (3) are connected together by composite twisting and are collectively sleeved with a first insulating sleeve (6). The control cable core (4) includes a control wire (41) and two second insulating sleeves (7). Both the conductive wire (31) and the control wire (41) are made of tin-plated oxygen-free copper.

7. The servo cable according to claim 6, characterized in that: The two second insulating sleeves (7) are arranged symmetrically, and each second insulating sleeve (7) is filled with multiple strands of control wire (41) connected together by composite twisting. The outer side of the two second insulating sleeves (7) is provided with a shielding layer with the same structure as the composite shielding layer (2), and the two second insulating sleeves (7) are arranged inside the shielding layer.

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