Double locking cable fixing head

Abstract

The utility model discloses a double locking cable fixing head relates to electrical equipment technical field, including main part and the installation nut and the galling nut of threaded cover in the both ends of main part, the waterproof ring of inside cover is equipped with in main part still includes at least two clamping blocks, and the galling nut includes the threaded part for with main part threaded connection and connecting portion, and the connecting portion is connected with the threaded part through at least two guide supports, so that the adjacent two guide supports enclose locking hole, the clamping block is connected with the guide support and is connected in place, so that the clamping block can slide relative to locking hole, and the inner peripheral portion of clamping block is equipped with arc hole, and the adjacent two clamping blocks are detachably connected through connecting piece, and the connecting piece has the extension of the radial direction of galling nut, when clamping block and guide support are connected in place and clamping block are locked through connecting piece, arc hole is pressed to the outer peripheral surface of cable. Its utilize clamping block and the mechanical interlock of connecting piece formed the second layer locking structure, strengthened the structural strength, avoided the deformation problem of high load working condition.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, to a double-locking cable fixing head. Background Technology

[0002] Cable clamps are widely used in electrical equipment such as control boxes, distribution boxes, and junction boxes to prevent water and contaminants from entering the enclosure, thus ensuring the safe operation of the equipment.

[0003] Non-metallic cable clamps, such as those made of nylon, are gradually replacing metal cable clamps due to their superior insulation, lightweight design, and lower cost. However, non-metallic cable clamps lack sufficient mechanical strength, which can easily lead to plastic deformation in critical parts of the cable clamp under high load conditions. This can cause a chain reaction of failures under high load conditions, such as when the cable is bent, resulting in sealing failure and reduced waterproof performance.

[0004] In summary, how to avoid the deformation of cable fixing heads under high load conditions is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a double-locking cable fixing head, which forms a second locking structure by mechanically interlocking the clamping block and the connecting parts. The double-locking structure enhances the structural strength of the cable fixing head and prevents it from deforming under high load conditions.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A double-locking cable fixing head includes a main body and mounting nuts and clamping nuts threaded onto both ends of the main body. A waterproof ring is provided inside the main body, and it also includes at least two clamping blocks. The clamping nut includes a connecting part and a threaded part for threaded connection with the main body. The connecting part is connected to the threaded part through at least two guide pillars, so that two adjacent guide pillars form a locking hole.

[0008] The clamping block is engaged with the guide post so that the clamping block can slide relative to the locking hole. The inner circumference of the clamping block is provided with an arc-shaped hole. Two adjacent clamping blocks are detachably connected by a connector. The connector has a radial extension of the tightening nut. When the clamping block is engaged with the guide post and the clamping block is locked by the connector, the arc-shaped hole presses against the outer circumferential surface of the cable.

[0009] Preferably, a limiting support is further provided between the connecting portion and the threaded portion. The limiting support is used to abut against the clamping block to limit the sliding stroke of the clamping block. The limiting support has a normal extension of the guide support.

[0010] Preferably, the limiting post is disposed between two adjacent guide posts, and the guide post is disposed between two adjacent limiting posts.

[0011] Preferably, the angle α between the limiting post and the adjacent guide post is 180° / n, where n is the number of guide posts.

[0012] Preferably, two guide pillars and two limiting pillars are provided between the threaded portion and the connecting portion. The clamping block is a rectangular clamping block. The inner circumference of the rectangular clamping block is provided with the arc-shaped hole, and the vertical symmetry plane of the arc-shaped hole is provided with a snap-fit ​​groove for engaging with the guide pillar.

[0013] Preferably, the guide post is arranged radially along the clamping nut, and the axis of the connector is parallel to the extension direction of the guide post.

[0014] Preferably, the connector includes a fastening bolt and a fastening nut. The bolt head of the fastening bolt abuts against the clamping block. The fastening bolt passes sequentially through the connecting hole of the clamping block, the through hole of the limiting support, and the connecting hole of the adjacent clamping block before connecting to the fastening nut.

[0015] Preferably, the arc-shaped hole of the clamping block is provided with an internal thread, which is used to increase the contact area between the arc-shaped hole and the cable.

[0016] Preferably, the inner diameter of the arc-shaped hole gradually decreases along the axial direction of the clamping nut, from the end relatively closer to the mounting end to the end relatively closer to the cable inlet end.

[0017] Preferably, the cone angle between the generatrix of the arc-shaped hole and the axis is the same as the cone angle of the inner cone surface of the tightening nut.

[0018] When in use, the tightening nut is threaded onto the cable inlet end of the main body. The inner conical surface of the tightening nut is used to squeeze the waterproof ring, causing it to radially contract and tighten the cable, forming the first layer of locking structure.

[0019] After the tightening nut is tightened into place, the clamping block is slidably installed in the locking hole, so that the clamping block is engaged with the guide support. The two adjacent clamping blocks are connected by the connector, so that the clamping block is tightened radially under the action of the connector. The arc-shaped hole is pressed against the outer circumference of the cable to form a second locking structure.

[0020] Compared to traditional cable clamps that rely solely on a single-layer locking structure where a tightening nut compresses the waterproof ring, the aforementioned double-locking cable clamp utilizes the mechanical interlocking of clamping blocks and connectors to form a second locking structure. This second locking structure not only enhances the structural strength of the cable clamp, resolving the deformation issue caused by insufficient strength during cable bending, but also improves tensile strength.

[0021] Simultaneously, the clamping block and locking hole are slidably connected, effectively compensating for the reserved gap between the clamping block and the locking nut caused by the machining tolerance of the clamping nut. Under the locking force of the connector, it can adaptively fill the tolerance, ensuring the applicability and reliability of the double-locking cable fixing head. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A schematic diagram of a specific embodiment of the double-locking cable fixing head provided by this utility model;

[0024] Figure 2 for Figure 1 An explosion diagram;

[0025] Figure 3 This is a schematic diagram of the tightening nut structure;

[0026] Figure 4 This is a front view diagram of the tightening nut;

[0027] Figure 5 This is a cross-sectional view of the tightening nut in the main view direction;

[0028] Figure 6 This is a side view of the tightening nut;

[0029] Figure 7 This is a cross-sectional view of the tightening nut from the side view direction;

[0030] Figure 8 This is a top view of the clamping block;

[0031] Figure 9 This is a schematic cross-sectional view of the first clamping block from a top-view perspective.

[0032] Figure 10 This is a side view of the first clamping block;

[0033] Figure 11 This is a schematic cross-sectional view of the second clamping block from a top view.

[0034] Figure 12 This is a side view of the second clamping block.

[0035] Figures 1-12 middle:

[0036] 1-Installation nut; 2-Sealing gasket; 3-Main body; 4-Waterproof ring; 5-Tightening nut; 51-Threaded part; 52-Guide support; 53-Limiting support; 54-Connecting part; 6-Clamping block; 61-Arc-shaped hole; 62-Snap-fit ​​groove; 7-Fastening bolt; 8-Fastening nut. Detailed Implementation

[0037] 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.

[0038] The core of this utility model is to provide a double-locking cable fixing head, which uses the mechanical interlocking of clamping blocks and connectors to form a second locking structure. The double-locking structure enhances the structural strength of the cable fixing head and prevents it from deforming under high load conditions.

[0039] The double-locking cable fixing head provided by this utility model includes a main body 3 and a mounting nut 1 and a clamping nut 5 threadedly sleeved at both ends of the main body. A waterproof ring 4 is provided inside the main body 3, and it also includes at least two clamping blocks 6. The clamping nut 5 includes a connecting part 54 and a threaded part 51 for threaded connection with the main body 3. The connecting part 54 is connected to the threaded part 51 through at least two guide pillars 52, so that two adjacent guide pillars 52 form a locking hole.

[0040] The clamping block 6 is snapped into the guide post 52 so that the clamping block 6 can slide relative to the locking hole. The inner circumference of the clamping block 6 is provided with an arc-shaped hole 61. Two adjacent clamping blocks 6 are detachably connected by a connector. The connector has a radial extension of the clamping nut 5. When the clamping block 6 is snapped into the guide post 52 and the clamping block 6 is locked by the connector, the arc-shaped hole 61 is pressed against the outer circumference of the cable.

[0041] Please refer to Figure 1 and Figure 2One end of the main body 3 of the cable fixing head is the installation end. The installation end of the main body 3 is threadedly connected to the installation nut 1 so that the cable fixing head can be installed on the equipment. In order to ensure the sealing performance of the installation end, a sealing gasket 2 is usually provided between the installation nut 1 and the main body 3.

[0042] The other end of the main body 3 is the cable inlet end. The cable inlet end of the main body 3 is threadedly connected to the clamping nut 5. When the clamping nut 5 is tightened, the inner conical surface of the clamping nut 5 presses against the waterproof ring 4 inside the main body 3, causing the waterproof ring 4 to contract radially inward and tighten the cable, thus forming the first layer of locking structure of the cable fixing head, which is also the locking structure of the traditional cable fixing head.

[0043] To prevent the first layer of locking structure from loosening and failing when the cable is bent, a clamping block 6 is slidably installed in the locking hole of the clamping nut 5. There are at least two clamping blocks 6. Two adjacent clamping blocks 6 can be detachably connected by a connector, which can be a fastening bolt 7 or a connecting pin, etc.

[0044] Since the connector has a radial extension of the clamping nut 5, the locking force of the connector has a radial component of the clamping nut 5. Therefore, when the connector connects two adjacent clamping blocks 6, the clamping blocks 6 slide inward relative to the locking hole along the radial direction of the clamping nut 5 until the clamping blocks 6 are engaged with the guide post 52. At this time, the two adjacent clamping blocks 6 are locked by the connector, and the arc-shaped hole 61 of the clamping block 6 is pressed against the outer circumferential surface of the cable to form a second locking structure.

[0045] It is understandable that when the extension direction of the guide post 52 is the same as the locking direction of the connector, the component of the locking force of the connector in the extension direction of the guide post 52 is the largest. At this time, the locking force of the connector can be used to push the guide post 52 to slide in the locking hole and make the clamping block 6 and the guide post 52 snap into place, making the assembly more convenient.

[0046] When the extension direction of the guide post 52 forms a certain angle with the locking direction of the connector, it is usually necessary to first push the clamping block 6 to make the clamping block 6 and the guide post 52 lock into place, and then use the connector to connect the two adjacent clamping blocks 6 to avoid interference between the locking of the connector and the sliding engagement of the clamping block 6.

[0047] Preferably, in order to facilitate the production and assembly of the cable fixing head, the guide post 52 can be set along the radial direction of the clamping nut 5, and the axis of the connector is parallel to the extension direction of the guide post 52; this facilitates the processing of the clamping nut 5 and the processing of the clamping block 6's snap-fit ​​groove 62 and connecting hole, and also facilitates the connection and fixing of the clamping block 6 and the connector.

[0048] It should be noted that adjacent clamping blocks 6 are not limited to two clamping blocks 6 abutting each other. As long as one clamping block 6 is closest to another clamping block 6 in the circumferential direction of the clamping nut 5, the two clamping blocks 6 can be regarded as adjacent.

[0049] When in use, the clamping nut 5 is threaded onto the cable inlet end of the main body 3. The inner conical surface of the clamping nut 5 is used to squeeze the waterproof ring 4, causing it to radially contract and tighten the cable, forming the first layer of locking structure.

[0050] After the tightening nut 5 is tightened into place, the clamping block 6 is slidably installed in the locking hole, so that the clamping block 6 is engaged with the guide support 52. The two adjacent clamping blocks 6 are connected by the connector, so that the clamping block 6 is tightened radially under the action of the connector, and the arc-shaped hole 61 is pressed against the outer circumference of the cable to form a second locking structure.

[0051] When the cable is bent, the clamping block 6 can transfer the stress to the guide pillar 52 through the connector, and then transfer the stress to the main body 3 through the threaded pair of the tightening nut 5 and the main body 3, so as to prevent the waterproof ring 4 from failing and deforming.

[0052] Please refer to Figure 8 and Figure 9 The clamping block 6 is provided with a through connecting hole for installing the connector. The connecting hole can be set as a smooth hole or a threaded hole. The inner circumference of the clamping block 6 is provided with an arc-shaped hole 61 and a snap-fit ​​groove 62 for engaging with the guide post 52. The shape of the snap-fit ​​groove 62 is adapted to the shape of the guide post 52.

[0053] Preferably, the arc-shaped hole 61 of the clamping block 6 may be provided with an internal thread. The internal thread is used to increase the contact area between the arc-shaped hole 61 and the cable, enhance the clamping ability of the clamping block 6 to lock the cable, and enable the arc-shaped hole 61 to better engage the surface of the cable.

[0054] The number of clamping blocks 6 is at least two, and can be specifically set to two, such as... Figure 2 As shown, it can also be set to three or more; considering that the more clamping blocks 6 there are, the more connecting parts there are and the more complicated the assembly process becomes, the number of clamping blocks 6 is usually set to two.

[0055] The dimensions of each clamping block 6 can be the same or different; in order to facilitate the processing of the clamping blocks 6, it is preferable to set the dimensions of each clamping block 6 to be the same, and the connecting holes on the clamping blocks 6 for installing the connecting parts are set perpendicular to the outer surface of the clamping blocks 6 to facilitate the processing of the connecting holes.

[0056] In this embodiment, the double-locking cable fixing head utilizes the mechanical interlocking of the clamping block 6 and the connector to form a second locking structure. Compared with the traditional cable fixing head that only uses the tightening nut 5 to compress the waterproof ring 4 as a single-layer locking structure, the double-layer locking structure can not only enhance the structural strength of the cable fixing head and solve the deformation problem caused by insufficient strength of the cable fixing head when the cable is bent, but also improve the tensile strength.

[0057] Meanwhile, the clamping block 6 and the locking hole are slidably connected, which effectively compensates for the reserved gap problem between the clamping block 6 and the locking nut 5 caused by the machining tolerance of the clamping nut 5. Under the locking force of the connector, it can adaptively fill the tolerance, ensuring the applicability and reliability of the double locking cable fixing head.

[0058] Preferably, the inner diameter of the arc-shaped hole 61 of the clamping block 6 can be set to gradually decrease along the axial direction of the clamping nut 5 from the end relatively closer to the installation end to the end relatively closer to the cable inlet end. The arc-shaped hole 61 of the clamping block 6 is a conical hole. Compared with ordinary cylindrical holes, the inner conical surface of the arc-shaped hole 61 can better engage and grip the cable surface, resulting in higher tensile strength at the clamping part and less deformation due to cable bending.

[0059] The cone angle between the generatrix of the arc-shaped hole 61 and the axis is preferably set to be the same as the cone angle of the inner cone surface of the clamping nut 5; of course, the cone angle of the arc-shaped hole 61 can also be adjusted according to actual tests in order to obtain the best tensile strength and deformation resistance.

[0060] It should be noted that when the arc-shaped hole 61 of the clamping block 6 is set as a conical hole, there are requirements for the installation direction of the clamping block 6 during assembly. In order to avoid the clamping block 6 being installed backwards, a foolproof mark can be set on the end face and / or outer side of the clamping block 6. The foolproof mark can be set as a graphic or text mark such as an arrow.

[0061] Based on the above embodiment, a limiting support 53 is also provided between the connecting part 54 and the threaded part 51 of the clamping nut 5. The limiting support 53 is used to abut against the clamping block 6 to limit the sliding distance of the clamping block 6. The limiting support 53 has a normal extension of the guide support 52.

[0062] Please refer to Figure 2 Two guide pillars 52 are provided between the connecting part 54 and the threaded part 51 of the clamping nut 5. The two guide pillars 52 can form two locking holes. Since the clamping block 6 can slide relative to the locking hole and the clamping block 6 is engaged with the guide pillars 52, the limiting pillar 53 is provided in the locking hole to limit the sliding stroke of the clamping block 6.

[0063] It is understandable that two adjacent clamping blocks 6 can be limited by the same limiting support 53, such as... Figure 2As shown, different limiting pillars 53 can also be used for limiting, as long as the extension direction of the through hole of the limiting pillar 53 used to install the connector is consistent with the locking direction of the connector.

[0064] Preferably, in order to simplify the structure of the clamping nut 5, a limiting support 53 can be provided between two adjacent guide supports 52, and the guide support 52 can be provided between two adjacent limiting supports 53.

[0065] The guide pillar 52 and the limiting pillar 53 are spaced apart in the circumferential direction of the clamping nut 5. The limiting pillar 53 can simultaneously slide and limit two adjacent clamping blocks 6, which not only simplifies the structure of the clamping nut 5 and facilitates the processing of the pillar structure between the connecting part 54 and the threaded part 51, but also facilitates the sliding installation of the clamping block 6 and the clamping nut 5, and the assembly of the clamping block 6 and the connecting parts.

[0066] Preferably, the included angle α between the limiting support 53 and the adjacent guide support 52 can be set to 180° / n, where n is the number of guide supports 52.

[0067] The limiting support 53 is located on the angle bisector of two adjacent guide supports 52. The limiting support 53 can cooperate with the adjacent guide supports 52 to form a stable and reliable support for the connecting part 54 and the threaded part 51 at both ends of the axial direction. Compared with the eccentric setting of the limiting support 53, the tightening nut 5 has stronger structural strength and stability.

[0068] Please refer to Figure 2 Two guide pillars 52 and two limiting pillars 53 are provided between the threaded part 51 and the connecting part 54 of the clamping nut 5. The guide pillars 52 and the limiting pillars 53 are evenly distributed in the circumferential direction of the clamping nut 5.

[0069] The clamping block 6 is a rectangular clamping block. The inner periphery of the rectangular clamping block is provided with an arc-shaped hole 61, and the vertical symmetrical plane of the arc-shaped hole 61 is provided with a snap-fit ​​groove 62 for engaging with the guide column 52.

[0070] Based on the above embodiments, the connector includes a fastening bolt 7 and a fastening nut 8. The bolt head of the fastening bolt 7 abuts against the clamping block 6. The fastening bolt 7 passes through the connecting hole of the clamping block 6, the through hole of the limiting support column 53, and the connecting hole of the adjacent clamping block 6 in sequence before connecting with the fastening nut 8.

[0071] To facilitate the processing of clamping blocks 6, each clamping block 6 is usually designed to have the same structure and size. Of course, to prevent the fastening bolts 7 and fastening nuts 8 from protruding from the outer surface of the clamping blocks 6, the connecting holes of the clamping blocks 6 can be designed as stepped holes.

[0072] Considering that the outer diameter of the bolt head of the fastening bolt 7 and the outer diameter of the corresponding fastening nut 8 may be different, the clamping block 6 can be divided into a first clamping block for installing the fastening bolt 7 and a second clamping block for installing the fastening nut 8. In order to avoid using two first clamping blocks as two adjacent clamping blocks 6 during assembly, the first clamping block and the second dummy block are usually designed to prevent mistakes.

[0073] It should be noted that the first and second clamping blocks mentioned in this application are only used to distinguish the different positions and do not limit the order.

[0074] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0075] The double-locking cable fixing head provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A double-locking cable fixing head, comprising a main body (3) and mounting nuts (1) and clamping nuts (5) threaded onto both ends of the main body (3), wherein a waterproof ring (4) is provided inside the main body (3), characterized in that, It also includes at least two clamping blocks (6), the clamping nut (5) includes a connecting part (54) and a threaded part (51) for threaded connection with the body (3), the connecting part (54) is connected to the threaded part (51) by at least two guide pillars (52) so that two adjacent guide pillars (52) form a locking hole; The clamping block (6) is snapped into the guide post (52) so that the clamping block (6) can slide relative to the locking hole. The inner circumference of the clamping block (6) is provided with an arc-shaped hole (61). Two adjacent clamping blocks (6) are detachably connected by a connector. The connector has a radial extension of the clamping nut (5). When the clamping block (6) is snapped into the guide post (52) and the clamping block (6) is locked by the connector, the arc-shaped hole (61) presses against the outer circumferential surface of the cable.

2. The double-locking cable fixing head according to claim 1, characterized in that, A limiting support (53) is also provided between the connecting part (54) and the threaded part (51). The limiting support (53) is used to abut against the clamping block (6) to limit the sliding stroke of the clamping block (6). The limiting support (53) has a normal extension of the guide support (52).

3. The double-locking cable fixing head according to claim 2, characterized in that, The limiting pillar (53) is located between two adjacent guide pillars (52), and the guide pillar (52) is located between two adjacent limiting pillars (53).

4. The double-locking cable fixing head according to claim 3, characterized in that, The angle α between the limiting support (53) and the adjacent guide support (52) is 180° / n, where n is the number of guide supports (52).

5. The double-locking cable fixing head according to claim 4, characterized in that, Two guide pillars (52) and two limiting pillars (53) are provided between the threaded part (51) and the connecting part (54). The clamping block (6) is a rectangular clamping block. The inner circumference of the rectangular clamping block is provided with the arc-shaped hole (61), and the vertical symmetry plane of the arc-shaped hole (61) is provided with a snap-fit ​​groove (62) for engaging with the guide pillar (52).

6. The double-locking cable fixing head according to claim 2, characterized in that, The guide post (52) is arranged radially along the clamping nut (5), and the axis of the connector is parallel to the extension direction of the guide post (52).

7. The double-locking cable clamp according to any one of claims 2-6, characterized in that, The connector includes a fastening bolt (7) and a fastening nut (8). The bolt head of the fastening bolt (7) abuts against the clamping block (6). The fastening bolt (7) passes through the connecting hole of the clamping block (6), the through hole of the limiting support (53), and the connecting hole of the adjacent clamping block (6) in sequence before connecting to the fastening nut (8).

8. The double-locking cable clamp according to any one of claims 1-6, characterized in that, The arc-shaped hole (61) of the clamping block (6) is provided with an internal thread, which is used to increase the contact area between the arc-shaped hole (61) and the cable.

9. The double-locking cable clamp according to any one of claims 1-6, characterized in that, The inner diameter of the arc-shaped hole (61) gradually decreases along the axial direction of the clamping nut (5) from the end relatively closer to the mounting end to the end relatively closer to the cable inlet end.

10. The double-locking cable fixing head according to claim 9, characterized in that, The cone angle between the generatrix of the arc-shaped hole (61) and the axis is the same as the cone angle of the inner cone surface of the clamping nut (5).

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