Servo power line with overcurrent protection function

Abstract

The utility model provides a servo power line with an overcurrent protection function, which comprises a cable body, a plurality of PTC (Positive Temperature Coefficient) elements and a plurality of wiring terminals, the cable body comprises a plurality of core wires, and the plurality of core wires, the plurality of PTC elements and the plurality of wiring terminals are in one-to-one correspondence; each core wire is electrically connected with the corresponding wiring terminal through the corresponding PTC element, and each core wire is not in contact with the corresponding wiring terminal. The servo power line with the overcurrent protection function can reduce or avoid the risk that the servo power line overheats or even is on fire in the using process, and the using safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable structure technical field especially is related to a kind of servo power line with overcurrent protection function. BACKGROUND

[0002] Servo power line is used to transmit electric energy to drive servo motor. In three-phase alternating current servo system, servo power line usually includes UVW three phase lines (some also have ground protection line). These cables are connected from power supply to servo driver, and then from driver to servo motor, to ensure that motor can obtain appropriate electric energy to achieve precise motion control. Servo power line is mainly used in industrial electrical appliances, motors, welding machines, machine tools, industrial fans, etc.

[0003] However, in actual work process, servo motor may be overloaded, at this time, the current through servo power line increases, and servo power line may overheat. Not only will it affect the service life of servo power line, but also it will have the risk of fire, which increases the safety risk of equipment use. SUMMARY

[0004] The utility model aims at providing a kind of servo power line with overcurrent protection function, it has the function of overcurrent protection, to reduce or avoid the risk of excessive heating or even fire of servo power line in use process, improve the security of use.

[0005] The utility model provides a kind of servo power line with overcurrent protection function, including cable body, multiple PTC elements and multiple terminals, the cable body includes multiple core wires, multiple the core wire, multiple the PTC element and multiple the terminal one-to-one correspondence;Each the core wire is respectively connected with corresponding terminal by corresponding PTC element, and each core wire and corresponding terminal do not contact each other.

[0006] In an implementable manner, the cable body further includes an insulating protective layer, which wraps the outside of the multiple core wires;The end of each core wire extends to the outside of the insulating protective layer and is connected to the corresponding PTC element.

[0007] In an implementable manner, each core wire includes a conductor and an insulating skin wrapped outside the conductor;The end of the conductor extends to the outside of the insulating skin and is connected to the corresponding PTC element.

[0008] In an implementable manner, the PTC element is a cylindrical structure, and a through hole is provided on the PTC element along its axial direction, and the conductor is inserted into the through hole from one side of the PTC element and electrically connected with the inner wall of the through hole.

[0009] In an implementable manner, a first conductive adhesive is arranged between the outer wall of the wire and the inner wall of the through hole.

[0010] In an implementable manner, the terminal is in a cylindrical structure, the terminal is inserted into the through hole from the other side of the PTC element and is electrically connected with the inner wall of the through hole, and the terminal does not contact the wire.

[0011] In an implementable manner, a second conductive adhesive is arranged between the outer wall of the terminal and the inner wall of the through hole.

[0012] In an implementable manner, the terminal comprises a hoop part and a tongue plate part which are integrally connected, and the hoop part is fixed on the outer wall of the PTC element.

[0013] In an implementable manner, an insulating sleeve is further arranged, and the insulating sleeve is arranged at the connection position of the core wire and the PTC element and the connection position of the terminal and the PTC element.

[0014] In an implementable manner, the insulating sleeve is a heat shrinkable sleeve.

[0015] The servo power line with the overcurrent protection function provided by the utility model has the advantages that the PTC element is arranged between the core wire and the terminal, the current must flow through the PTC element because the core wire and the terminal do not contact each other, when the current flowing through the PTC element exceeds the set range, the temperature of the PTC element rises, the resistance increases, the current flowing through the core wire is reduced, the overcurrent protection function is realized, and the risk of excessive heating or even fire of the servo power line in the use process is reduced or avoided, and the safety in use is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a structural schematic view of the servo power line with the overcurrent protection function in the embodiment of the utility model.

[0017] Figure 2 Fig. 2 is a sectional view along the position A-A. Figure 1

[0018] Figure 3 Fig. 3 is a connection relationship schematic view of the core wire, the terminal and the PTC element in the embodiment of the utility model.

[0019] Figure 4 Fig. 4 is a sectional view along the position A-A. Figure 3

[0020] Figure 5 Fig. 5 is a connection relationship sectional view of the core wire, the terminal and the PTC element in another embodiment of the utility model.​​

[0021] Figure 6 This is a schematic diagram of the terminal block structure in another embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram showing the connection relationship between the core wire and the terminal block and the PTC element in another embodiment of the present invention. Detailed Implementation

[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0024] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0025] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed by this utility model.

[0026] like Figures 1 to 4 As shown, this embodiment of the utility model provides a servo power cable with overcurrent protection, including a cable body 1 (i.e., cable), multiple PTC (Positive Temperature Coefficient) thermistors 2, and multiple terminals 3. The cable body 1 includes multiple core wires 12, with each core wire 12, PTC element 2, and terminal 3 corresponding to the others. Each core wire 12 is electrically connected to its corresponding terminal 3 via a corresponding PTC element 2; that is, each PTC element 2 is connected to its corresponding core wire 12 and its corresponding terminal 3. Each core wire 12 and its corresponding terminal 3 do not contact each other, meaning each core wire 12 is not directly connected to its corresponding terminal 3. The terminal 3 is made of metal and is used for electrical connection to electrical equipment (e.g., a servo motor). In this embodiment, the number of core wires 12 is shown as three, and the number of PTC elements 2 and terminal 3 is three each; in other embodiments, the number of core wires 12 can also be four, five, etc.

[0027] Specifically, the PTC element 2 is generally a polymer PTC, which is generally a mixture of a polymer and conductive particles (or a semiconductor ceramic material, etc.); the resistance of the PTC element 2 increases with the increase of temperature. The material and working principle of the PTC element 2 can refer to the prior art, which will not be described here.

[0028] In this embodiment, the PTC element 2 is arranged between the core wire 12 and the terminal 3, and the current must flow through the PTC element 2 because the core wire 12 and the terminal 3 are not in contact with each other; when the current flowing through the PTC element 2 exceeds the set range, the temperature of the PTC element 2 increases (the greater the current flowing through the PTC element 2, the greater the heat generated by the PTC element 2, and the temperature of the PTC element 2 increases), the resistance increases, and the current flowing through the core wire 12 decreases, thereby playing a safety protection (overcurrent protection) role, reducing or avoiding the risk of excessive heating or even fire of the servo power line during use, and improving the safety of use.

[0029] As shown in Figures 1 to 4 As an embodiment, the cable body 1 further includes an insulating protective layer 11 (i.e., an armor layer), which wraps the outside of the plurality of core wires 12; the end of each core wire 12 extends out of the insulating protective layer 11 and is connected to the corresponding PTC element 2. The insulating protective layer 11 is used to protect the plurality of core wires 12, and the insulating protective layer 11 is generally made of rubber. When assembling and connecting the core wire 12 and the PTC element 2, the end of the cable body 1 generally needs to be stripped, that is, the insulating protective layer 11 at the end of the cable body 1 is removed, so that the end of the core wire 12 is exposed, and then the core wire 12 is connected to the PTC element 2.

[0030] As shown in Figures 1 to 4 As an embodiment, each core wire 12 includes a wire 121 and an insulating skin 122 wrapping the outside of the wire 121; the end of the wire 121 extends out of the insulating skin 122 and is connected to the corresponding PTC element 2, and the wire 121 and the corresponding terminal 3 are not in contact with each other. The wire 121 is generally a copper wire, an aluminum wire, etc.; the insulating skin 122 is used to insulate and protect the wire 121, and the insulating skin 122 is generally made of polyurethane, polyester, polyester imine, polyamide imide, etc. When assembling and connecting the wire 121 and the PTC element 2, the end of the core wire 12 generally needs to be stripped, that is, the insulating skin 122 at the end of the core wire 12 is removed, so that the end of the wire 121 is exposed, and then the wire 121 is connected to the PTC element 2.

[0031] As shown in Figures 1 to 4As shown, in one embodiment, the PTC element 2 has a cylindrical structure. A through hole 21 is provided on the PTC element 2 along its axial direction, penetrating the PTC element 2. One end of the wire 121 is inserted into the through hole 21 from one side of the PTC element 2 and electrically connected to the inner wall of the through hole 21. The terminal block 3 is located on the side of the PTC element 2 away from the cable body 1. The terminal block 3 has a cylindrical structure. One end of the terminal block 3 is inserted into the through hole 21 from the other side of the PTC element 2 and electrically connected to the inner wall of the through hole 21. The terminal block 3 and the wire 121 do not contact each other (i.e., the end of the terminal block 3 and the end of the wire 121 are spaced apart within the through hole 21). The other end of the terminal block 3 is used for electrical connection to electrical equipment.

[0032] In one embodiment, a first conductive adhesive (not shown) is provided between the outer wall of the wire 121 and the inner wall of the through hole 21, and a second conductive adhesive (not shown) is provided between the outer wall of the terminal 3 and the inner wall of the through hole 21. The first and second conductive adhesives not only improve the electrical connection performance between the wire 121 and the PTC element 2, and between the terminal 3 and the PTC element 2, but also bond and fix the wire 121 and the PTC element 2, and the terminal 3 and the PTC element 2, preventing the wire 121 and the terminal 3 from detaching from the PTC element 2. Of course, in other embodiments, the wire 121 can also directly contact the inner wall of the through hole 21 for electrical connection, and the terminal 3 can also directly contact the inner wall of the through hole 21 for electrical connection.

[0033] like Figure 5 As shown, in another embodiment, the servo power line with overcurrent protection also includes an insulating sleeve 4. The insulating sleeve 4 is fitted and fixed at the connection points between the core wire 12 and the PTC element 2, and at the connection points between the terminal 3 and the PTC element 2. That is, the insulating sleeve 4 wraps around the end of the core wire 12, the outside of the PTC element 2, and the end of the terminal 3. The insulating sleeve 4 not only provides insulation protection for the connection points between the core wire 12 and the PTC element 2, and the connection points between the terminal 3 and the PTC element 2, but also provides auxiliary fixation for the wire 121 and the PTC element 2, as well as the terminal 3 and the PTC element 2, preventing the wire 121 and the terminal 3 from detaching from the PTC element 2. In one embodiment, the insulating sleeve 4 is a heat-shrink tubing. During assembly, the heat-shrink tubing is simply placed on the connection points between the core wire 12 and the PTC element 2, and between the terminal 3 and the PTC element 2. Then, the heat-shrink tubing is heated and baked, causing it to shrink and tightly wrap around the end of the core wire 12, the exterior of the PTC element 2, and the end of the terminal 3. Of course, in other embodiments, the insulating sleeve 4 can also have other structures. For example, the insulating sleeve 4 can be formed by wrapping insulating tape around the connection points between the core wire 12 and the PTC element 2, and between the terminal 3 and the PTC element 2.

[0034] As Figure 6 and Figure 7 As shown in FIG. 1, as an embodiment, the wiring terminal 3 comprises a clamping portion 31 and a tongue plate portion 32 which are integrally connected, the clamping portion 31 is in a ring structure (specifically, it can be a circular ring structure, a semi-circular ring structure, etc.), and the clamping portion 31 is clamped and fixed on the outer wall of the PTC element 2; the tongue plate portion 32 is located on the side of the clamping portion 31 away from the core wire 12, and the tongue plate portion 32 is in a flat plate structure, and the tongue plate portion 32 is used for electrical connection with the electrical equipment (specifically, the tongue plate portion 32 is provided with a mounting hole 321, and the tongue plate portion 32 can be screwed with the electrical equipment through the mounting hole 321). As an embodiment, the clamping portion 31 comprises a plurality of fixed claws 311 which are arranged at intervals, and when assembled, only the PTC element 2 needs to be placed between the plurality of fixed claws 311, and then the plurality of fixed claws 311 are extruded to deform and clamp the PTC element 2. Of course, in other embodiments, the clamping portion 31 can also be in a circular ring structure, etc. For such a structure of the wiring terminal 3, please refer to the prior art, and details are not described herein. As an embodiment, a third conductive glue (not shown in the figure) is arranged between the inner wall of the clamping portion 31 and the outer wall of the PTC element 2, so as to increase the conductivity and assist in fixing.

[0035] Of course, in other embodiments, the wiring terminal 3 can also be in other structural forms, and the connection mode between the wiring terminal 3 and the PTC element 2 can also be adjusted and changed according to actual needs.

[0036] The servo power line with the overcurrent protection function provided by the embodiment of the utility model, by setting the PTC element 2 between the core wire 12 and the wiring terminal 3, because the core wire 12 and the wiring terminal 3 do not contact each other, therefore the current must flow through the PTC element 2; when the current flowing through the PTC element 2 exceeds the set range, the temperature of the PTC element 2 rises, the resistance increases, and the current flowing through the core wire 12 decreases, so as to play a safety protection (overcurrent protection) role, thereby reducing or avoiding the risk of excessive heating or even fire of the servo power line in the use process, and improving the safety of use.

[0037] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A servo power line having an overcurrent protection function, characterized by comprising: The cable body (1) comprises a plurality of core wires (12), and the plurality of core wires (12), the plurality of PTC elements (2) and the plurality of wiring terminals (3) are in one-to-one correspondence; each core wire (12) is electrically connected to the corresponding PTC element (2) and the corresponding wiring terminal (3) respectively, and each core wire (12) and the corresponding wiring terminal (3) are not in contact with each other.

2. The servo power line having an overcurrent protection function according to claim 1, wherein, The cable body (1) further comprises an insulating protective layer (11) wrapped outside the plurality of core wires (12); the end of each core wire (12) extends out of the insulating protective layer (11) and is connected to the corresponding PTC element (2).

3. The servo power line having an overcurrent protection function according to claim 1, wherein Each core wire (12) comprises a wire (121) and an insulating skin (122) wrapped outside the wire (121); the end of the wire (121) extends out of the insulating skin (122) and is connected to the corresponding PTC element (2).

4. The servo power line having an overcurrent protection function according to claim 3, wherein, The PTC element (2) is in a cylindrical structure, and a through hole (21) is arranged on the PTC element (2) in the axial direction; the wire (121) is inserted into the through hole (21) from one side of the PTC element (2) and is electrically connected to the inner wall of the through hole (21).

5. The servo power line having an overcurrent protection function according to claim 4, wherein, A first conductive adhesive is arranged between the outer wall of the wire (121) and the inner wall of the through hole (21).

6. The servo power line having an overcurrent protection function according to claim 4, wherein, The wiring terminal (3) is in a cylindrical structure, and the wiring terminal (3) is inserted into the through hole (21) from the other side of the PTC element (2) and is electrically connected to the inner wall of the through hole (21), and the wiring terminal (3) is not in contact with the wire (121).

7. The servo power line having an overcurrent protection function according to claim 6, wherein A second conductive adhesive is arranged between the outer wall of the wiring terminal (3) and the inner wall of the through hole (21).

8. The servo power line having an overcurrent protection function according to claim 4, wherein The wiring terminal (3) comprises a hoop part (31) and a tongue plate part (32) connected integrally, and the hoop part (31) is hoop-fixed on the outer wall of the PTC element (2).

9. The servo power line having an overcurrent protection function according to any one of claims 1 to 8, wherein Further comprising an insulating sleeve (4) fixedly sleeved at the connection position of the core wire (12) and the PTC element (2) and the connection position of the wiring terminal (3) and the PTC element (2).

10. The servo power line having an overcurrent protection function according to claim 9, wherein, The insulating sleeve (4) is a heat-shrinkable sleeve.

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