Junction box for intrinsically safe circuit

Abstract

The utility model provides a junction box for an intrinsically safe circuit. The junction box for the intrinsically safe circuit comprises a box body which is provided with a wire passing hole and a containing cavity which are communicated with each other, and the wire passing hole is used for a wire harness to pass through; the circuit assembly is located in the containing cavity, the circuit assembly comprises a circuit board and a wiring terminal arranged on the circuit board, and the wiring terminal is electrically connected with the circuit board; wherein the wiring terminal comprises a body and a wire locking structure, the wire locking structure is movably arranged on the body, the body is provided with a threading hole, and one end of the wire harness penetrates through the threading hole and then is connected with the circuit board; and after the wire harness extends into the threading hole, the wire locking structure is used for pressing the wire harness. According to the utility model, the problem of poor wiring reliability in the junction box in the prior art is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mining technical field, specifically, it relates to a junction box for intrinsic safety circuit. BACKGROUND

[0002] At present, with the popularization of intelligent coal mining, the underground engineering circuit wiring is an important component link of realizing intelligent coal mining construction, and the junction box is the core of the wire and cable connection. In the prior art, the wiring terminal in the junction box is mostly fence type copper bar wiring terminal or PCB direct welding type threaded frame type wire clamping wiring terminal, which has problems of complicated wiring, unreliable wiring, misconnection, rework time-consuming and the like. UTILITY MODEL CONTENTS

[0003] The utility model discloses a junction box for intrinsic safety circuit, which solves the problem of poor wiring reliability in the prior art.

[0004] In order to achieve the above purpose, the utility model provides a junction box for intrinsic safety circuit, which comprises: a box body having a wire passing hole and a receiving cavity in communication with each other, the wire passing hole being used for the wire harness to pass through; a circuit assembly located in the receiving cavity, the circuit assembly comprising a circuit board and a wiring terminal provided on the circuit board, the wiring terminal being electrically connected with the circuit board; wherein the wiring terminal comprises a body and a wire locking structure, the wire locking structure being movably arranged on the body, the body having a wire passing hole, one end of the wire harness passing through the wire passing hole and being connected with the circuit board; after the wire harness extends into the wire passing hole, the wire locking structure is used for compressing the wire harness.

[0005] Further, the wire passing hole is a plurality of groups, the plurality of groups of wire passing holes are arranged at intervals along a first direction of the circuit board, and each group of wire passing holes comprises at least two sub-wire passing holes arranged at intervals along a second direction; the wire locking structure is a plurality of, and the plurality of wire locking structures are arranged one-to-one corresponding to the plurality of sub-wire passing holes.

[0006] Further, the wiring terminal has a test hole, the test hole is a plurality of, and the plurality of test holes are arranged one-to-one corresponding to the plurality of groups of wire passing holes.

[0007] Further, the wire passing hole is a tapered hole, and the inner diameter of the wire passing hole gradually increases in the direction from the inside to the outside of the receiving cavity.

[0008] Further, the wire locking structure comprises: a pressing rod; an operating rod connected with the pressing rod and arranged at an angle with the pressing rod; and an elastic structure, both ends of the elastic structure abutting against the pressing rod and the wire harness, so as to apply an elastic compression force to the wire harness; wherein the pressing rod is driven to rotate relative to the body by the operating rod, so that the pressing rod compresses the elastic structure.

[0009] Furthermore, the main body also has a mounting hole, which is connected to the wire threading hole; wherein, when the pressure rod compresses the wiring harness, at least a part of the operating rod is located in the mounting hole, and at least another part is limited to the main body; there are multiple mounting holes, and the multiple mounting holes are arranged in a one-to-one correspondence with the multiple wire locking structures.

[0010] Furthermore, the main body includes a plurality of plates arranged at intervals along the second direction, each plate having a group of wire threading holes, at least one electrical measuring hole and at least two mounting holes, each group of wire threading holes includes two sub-wire threading holes, at least one electrical measuring hole is located between the two sub-wire threading holes, and at least one mounting hole is located between a wire threading hole and at least one electrical measuring hole.

[0011] Furthermore, the box body includes: a bottom plate; a surrounding plate, which is arranged on and connected to the bottom plate, and has a wire hole; and a cover plate, which is detachably covered on the surrounding plate to form a accommodating cavity between the surrounding plate and the bottom plate.

[0012] Furthermore, anti-slip grooves are provided on the outer surface of the operating rod.

[0013] Furthermore, a conductive copper sheet is provided in the threading hole, and the wiring harness inserted into the threading hole is electrically connected to the circuit board through the conductive copper sheet.

[0014] Applying the technical solution of the present utility model, a junction box for an intrinsically safe circuit includes: a box body having interconnected wire holes and a receiving cavity, the wire holes being used to allow the wire harness to pass through; a circuit assembly located within the receiving cavity, the circuit assembly including a circuit board and wiring terminals disposed on the circuit board, the wiring terminals being electrically connected to the circuit board. The wiring terminals include a main body and a wire locking structure, the wire locking structure being movably disposed on the main body, the main body having a wire threading hole, one end of the wire harness being passed through the wire threading hole and connected to the circuit board. Thus, after the wire harness is inserted into the wire threading hole, the wire locking structure compresses the wire harness to prevent it from escaping from the threading hole and affecting the wiring stability. This solves the problem of poor wiring reliability within the junction box in the prior art and improves the wiring stability of the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a junction box for an intrinsically safe circuit according to the present utility model is shown;

[0017] Figure 2 Shown Figure 1 Exploded view of the junction box for intrinsically safe circuits;

[0018] Figure 3 Fig. 3 shows a perspective view of the assembled wiring terminal and circuit board of the junction box for intrinsic safety circuit in Fig. 1. Figure 2 Fig. 3 shows a perspective view of the assembled wiring terminal and circuit board of the junction box for intrinsic safety circuit in Fig. 1.

[0019] Wherein, the above figures include the following reference signs:

[0020] 10, box body; 11, wire hole; 12, accommodating cavity; 13, bottom plate; 14, surrounding plate; 15, cover plate;

[0021] 20, circuit board;

[0022] 30, wiring terminal; 31, body; 311, wire hole; 3111, sub wire hole; 312, mounting hole; 313, plate body; 32, wire locking structure; 33, electricity testing hole;

[0023] 40, joint. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as that generally understood by those skilled in the art to which the present application belongs.

[0026] In the present application, unless otherwise specified, the orientation words such as "up, down" are generally directed to the direction shown in the drawings, or are directed to the vertical, perpendicular or gravity direction; similarly, for the convenience of understanding and description, "left, right" are generally directed to the left and right shown in the drawings; "inner, outer" refer to the inner and outer relative to the contour of each component, but the above orientation words are not used to limit the present application.

[0027] In order to solve the problem of poor wiring reliability in the junction box in the prior art, the present application provides a junction box for intrinsic safety circuit.

[0028] As Figures 1 to 3As shown, the intrinsically safe circuit terminal box comprises a box body 10 and a circuit assembly. The box body 10 has a wire hole 11 and a receiving cavity 12 in communication with each other, and the wire hole 11 is used for the wire harness to pass through. The circuit assembly is located in the receiving cavity 12, and the circuit assembly comprises a circuit board 20 and a terminal 30 arranged on the circuit board 20, and the terminal 30 is electrically connected with the circuit board 20. The terminal 30 comprises a body 31 and a wire locking structure 32 movably arranged on the body 31, and the body 31 has a wire hole 311, and one end of the wire harness passes through the wire hole 311 and is connected with the circuit board 20; after the wire harness extends into the wire hole 311, the wire locking structure 32 is used for pressing the wire harness.

[0029] According to the technical scheme of the embodiment, after the wire harness extends into the wire hole 311, the wire locking structure 32 presses the wire harness to prevent the wire harness from being pulled out of the wire hole 311 and affecting the wiring stability, thereby solving the problem of poor wiring reliability in the terminal box in the prior art and improving the wiring stability of the terminal box.

[0030] Optionally, the wire hole 311 is in multiple groups, the multiple groups of wire holes 311 are arranged at intervals along a first direction of the circuit board 20, each group of wire holes 311 comprises at least two sub-wire holes 3111 arranged at intervals along a second direction, and the wire locking structure 32 is in multiple groups, and the multiple groups of wire locking structures 32 are arranged one-to-one corresponding to the multiple sub-wire holes 3111. In this way, the above arrangement of the number of wire holes 311 and the arrangement mode is more flexible to meet different use requirements and working conditions, and also improves the processing flexibility of the workers.

[0031] In the embodiment, the first direction is the length direction of the circuit board 20, and the second direction is the width direction of the circuit board 20. Each group of wire holes 311 comprises two sub-wire holes 3111. In this way, the above arrangement of the multiple groups of wire holes 311 and the wire locking structure 32 improves the wiring density and flexibility of the terminal box, and is suitable for complex circuit systems that require a large number of wire harness connections.

[0032] Specifically, the above arrangement of the wire hole 311 and the wire locking structure 32 enables the terminal box to realize more wire harness connections in a limited space, not only reduces the occupied space of the terminal box, but also improves the control accuracy and operation efficiency of the automatic production line.

[0033] As shown in the figure, Figure 3 The terminal 30 has a plurality of measurement holes 33, and the plurality of measurement holes 33 are arranged one-to-one corresponding to the multiple groups of wire holes 311. In this way, the above arrangement of the measurement holes 33 facilitates circuit detection without damaging the circuit connection, improves the convenience and safety of circuit maintenance. At the same time, the above arrangement makes the number of measurement holes 33 more flexible to meet different use requirements and working conditions, and also improves the processing flexibility of the workers.

[0034] In this embodiment, wire hole 11 is a tapered hole, with its inner diameter gradually increasing from the inside to the outside of accommodating cavity 12. This tapered hole provides a better seal when the wiring harness passes through, preventing dust and moisture from entering the junction box. This effectively improves the junction box's protection level and ensures stable operation of the circuit outdoors or in harsh environments.

[0035] In this embodiment, the wire locking structure 32 includes a pressure rod, an operating rod, and an elastic structure. The operating rod is connected to the pressure rod and is arranged at an angle to the pressure rod. The ends of the elastic structure respectively abut the pressure rod and the wiring harness to apply an elastic compressive force to the wiring harness. The operating rod drives the pressure rod to rotate relative to the body 31, so that the pressure rod compresses the elastic structure. This arrangement makes the structure of the wire locking structure 32 simpler, easier to process and implement, and reduces the processing cost and difficulty of the wire locking structure 32.

[0036] Specifically, the above arrangement of the wire locking structure not only ensures the fastening of the wire harness, but also provides additional stability through the elastic pressing force of the elastic structure.

[0037] Optionally, the elastic structure is a spring.

[0038] like Figure 3 As shown, the main body 31 also has a mounting hole 312, which communicates with the threading hole 311. When the pressure lever compresses the wiring harness, at least a portion of the operating lever is located within the mounting hole 312, while at least another portion of the operating lever is positioned within the mounting hole 312 and a stop is formed between the main body 31. Multiple mounting holes 312 are provided, each corresponding to a plurality of wire locking structures 32. This arrangement of mounting holes 312 not only provides space for the operating lever to move, but also ensures the stability and accuracy of the wire locking structures 32 through the stop.

[0039] like Figure 3 As shown, the main body 31 includes a plurality of plates 313 spaced apart along the second direction. Each plate 313 has a set of wire holes 311, at least one current measurement hole 33, and at least two mounting holes 312. Each set of wire holes 311 includes two sub-wire holes 3111, with at least one current measurement hole 33 located between the two sub-wire holes 3111. At least one mounting hole 312 is located between a wire hole 311 and at least one current measurement hole 33. This arrangement simplifies the structure of the main body 31, making it easier to manufacture and implement, thereby reducing the manufacturing cost of the junction box. Furthermore, the use of the plates 313 effectively improves the space utilization of the junction box, while facilitating circuit layout and maintenance.

[0040] In this embodiment, the plate body 313 has a group of wire threading holes 311, an electrical measuring hole 33 and two mounting holes 312. Each group of wire threading holes 311 includes two sub-wire threading holes 3111, an electrical measuring hole 33 is located between the two sub-wire threading holes 3111, and an mounting hole 312 is located between a wire threading hole 311 and an electrical measuring hole 33.

[0041] like Figure 2 As shown, the box body 10 includes a base plate 13, a surrounding plate 14, and a cover plate 15. The surrounding plate 14 is disposed on and connected to the base plate 13 and has a wire hole 11. The cover plate 15 is removably mounted on the surrounding plate 14 to form a receiving cavity 12 between the surrounding plate 14 and the base plate 13. The removable design of the cover plate 15 not only facilitates the installation and removal of the junction box, but also facilitates the replacement and maintenance of circuit components. Furthermore, the above arrangement simplifies the structure of the box body 10, making it easier to process and implement, thereby reducing the processing cost and difficulty of the box body 10.

[0042] In this embodiment, the enclosure 14 is a quadrilateral enclosure, and the cover 15 is connected to the enclosure 14 via fasteners.

[0043] Optionally, the fastener is a screw or a bolt.

[0044] Optionally, the outer surface of the operating lever is provided with anti-slip grooves. Such anti-slip grooves can increase the friction between the operating lever and the fingers, ensuring stable and accurate operation even with wet hands or wearing gloves, making it suitable for various operating environments and improving the convenience of using the junction box.

[0045] In this embodiment, a conductive copper sheet is disposed within the wire hole 311, and the wire harness inserted into the wire hole 311 is electrically connected to the circuit board 20 via the conductive copper sheet. This arrangement not only improves electrical conductivity between the wire harness and the circuit board 20 but also prevents wear of the wire harness to a certain extent, thereby extending the service life of the junction box.

[0046] Specifically, the use of conductive copper sheets improves the conductivity and connection stability between the wiring harness and the circuit board 20, and is suitable for various occasions requiring long-term stable operation, effectively reducing the circuit failure rate, extending the service life of the junction box, and improving the system's operating safety and stability.

[0047] Optionally, the box body 10 is made of a flame retardant material. In this way, the above configuration improves the flame retardant performance of the junction box and avoids safety accidents.

[0048] Optionally, reinforcing ribs are provided at the connection between the bottom plate 13 and the surrounding plate 14 to improve the overall structural strength of the box body 10 through the reinforcing ribs.

[0049] Optionally, there are multiple reinforcing ribs, which are arranged at intervals around the circumference of the enclosure 14.

[0050] like Figure 1 As shown, the intrinsically safe circuit junction box further includes a connector 40 , which is passed through the wire hole 11 .

[0051] Optionally, there are multiple connectors 40 , and the multiple connectors 40 are arranged in a one-to-one correspondence with the multiple wire holes 11 .

[0052] In this embodiment, there are four connectors 40 , two connectors 40 are located on one side, and the other two connectors 40 are located on the other side.

[0053] It should be noted that the number of connectors 40 is not limited to this and can be adjusted according to working conditions and usage requirements. Optionally, there are two, three, five, or more connectors 40.

[0054] Specifically, when using terminal block 30, peel the wire harness approximately 10 mm, rotate the operating lever, and then insert the wires into the threading holes 311 one by one. Press the operating lever to lock the harness. After wiring is complete, use the electrical test hole 33 to test the wiring harness for correctness. If the connection is incorrect, repeat the above wiring steps.

[0055] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0056] A junction box for intrinsically safe circuits includes a box body with interconnected wire holes and a receiving cavity. The wire holes are for passing a wiring harness through; a circuit assembly located within the receiving cavity. The circuit assembly includes a circuit board and wiring terminals disposed on the circuit board, the wiring terminals being electrically connected to the circuit board. The wiring terminals include a main body and a wire locking structure movably disposed on the main body. The main body has a wire hole through which one end of the wiring harness passes and connects to the circuit board. Once the wiring harness is inserted into the hole, the locking structure compresses the wiring harness to prevent it from escaping and affecting wiring stability. This solves the problem of poor wiring reliability within junction boxes in the prior art and improves wiring stability.

[0057] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0058] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an either chronological or spatial relation to each other, but are used merely to distinguish a different single implementation from another unless specifically indicated otherwise. It should be understood that the use of the term "or" in the context of describing example embodiments is used to mean a selection of one or more of the alternatives. For example, the phrase "A / B or C" is satisfied by any one of the following alternatives: [A and B] or [C].

[0060] The preferred embodiments of the present application have been described above with the specific embodiments. The present application is not limited to the above embodiments. It will be appreciated by those skilled in the art that any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A junction box for an intrinsically safe circuit, characterized in that: include: The box body (10) has a wire hole (11) and a receiving cavity (12) that are communicated with each other, wherein the wire hole (11) is used for allowing the wire harness to pass through; A circuit assembly is located in the accommodating cavity (12), the circuit assembly comprising a circuit board (20) and a connection terminal (30) disposed on the circuit board (20), the connection terminal (30) being electrically connected to the circuit board (20); The wiring terminal (30) comprises a body (31) and a wire locking structure (32), wherein the wire locking structure (32) is movably arranged on the body (31), and the body (31) has a wire threading hole (311), and one end of the wiring harness passes through the wire threading hole (311) and is connected to the circuit board (20); after the wiring harness extends into the wire threading hole (311), the wire locking structure (32) is used to press the wiring harness.

2. The intrinsically safe circuit junction box according to claim 1, characterized in that: The threading holes (311) are in a plurality of groups, and the plurality of groups of threading holes (311) are spaced apart along a first direction of the circuit board (20), and each group of threading holes (311) includes at least two sub-threading holes (3111) spaced apart along a second direction; and the plurality of wire locking structures (32) are in a plurality, and the plurality of wire locking structures (32) are arranged in a one-to-one correspondence with the plurality of sub-threading holes (3111).

3. The intrinsically safe circuit junction box according to claim 1, characterized in that: The wiring terminal (30) has a plurality of electricity measuring holes (33), and the plurality of electricity measuring holes (33) are arranged in a one-to-one correspondence with the plurality of groups of wire threading holes (311).

4. The intrinsically safe circuit junction box according to claim 1, characterized in that: The wire-passing hole (11) is a tapered hole, and the inner diameter of the wire-passing hole (11) gradually increases in a direction from the inner side to the outer side of the accommodating cavity (12).

5. The intrinsically safe circuit junction box according to claim 1, characterized in that: The locking structure (32) comprises: pressure rod; An operating rod connected to the pressure rod and arranged at an angle to the pressure rod; an elastic structure, wherein two ends of the elastic structure respectively abut against the pressure rod and the wiring harness to apply an elastic pressing force to the wiring harness; The operating rod drives the pressure rod to rotate relative to the body (31), so that the pressure rod compresses the elastic structure.

6. The intrinsically safe circuit junction box according to claim 5, characterized in that: The body (31) further comprises a mounting hole (312), wherein the mounting hole (312) is communicated with the threading hole (311); wherein, when the pressure rod compresses the wiring harness, at least a portion of the operating rod is located in the mounting hole (312), and at least another portion is in a position-limiting stop with the body (31); and the mounting holes (312) are multiple, and the multiple mounting holes (312) are arranged in a one-to-one correspondence with the multiple wire locking structures (32).

7. The junction box for an intrinsically safe circuit according to claim 3, characterized in that: The body (31) comprises a plurality of plates (313) spaced apart along a second direction, each plate (313) having a group of wire threading holes (311), at least one electrical measurement hole (33) and at least two mounting holes (312), each group of wire threading holes (311) comprising two sub-wire threading holes (3111), at least one electrical measurement hole (33) being located between the two sub-wire threading holes (3111), and at least one mounting hole (312) being located between one wire threading hole (311) and at least one electrical measurement hole (33).

8. The intrinsically safe circuit junction box according to claim 1, characterized in that: The box body (10) comprises: bottom plate (13); A panel (14) is provided on the bottom plate (13) and connected to the bottom plate (13), and the panel (14) has the wire hole (11); A cover plate (15) is detachably mounted on the enclosure plate (14) to surround the enclosure plate (14) and the bottom plate (13) to form the accommodating cavity (12).

9. The intrinsically safe circuit junction box according to claim 5, characterized in that: Anti-slip grooves are arranged on the outer surface of the operating rod.

10. The intrinsically safe circuit junction box according to claim 1, characterized in that: A conductive copper sheet is provided in the threading hole (311), and the wiring harness inserted into the threading hole (311) is electrically connected to the circuit board (20) through the conductive copper sheet.

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