CN218867860U - High-precision explosion-proof junction box capable of being externally connected with flexible pipe and used for weighing module - Google Patents

Abstract

The utility model provides a high-precision explosion-proof junction box for a weighing module, which can be externally connected with a flexible pipe, and comprises a shell, at least one joint, an upper cover and a PCB (printed circuit board), wherein the side wall surface of the shell is provided with at least one inner-punched hole flanging with internal threads, and the joint is in threaded connection with the hole flanging and is used for connecting an external cable; the PCB is fixed in the shell, and the upper cover is buckled and connected with the shell up and down. The utility model discloses can connect the explosion-proof terminal box of high accuracy for the weighing module of flexible tube, used joint has the external screw thread nut, can directly link to each other with user's flexible tube, plays the guard action to the cable, guarantees that the terminal box can be used in the occasion higher to the safety requirement, has widened the use place of terminal box.

Description

High-precision explosion-proof junction box capable of being externally connected with flexible pipe and used for weighing module

Technical Field

The utility model relates to a terminal box field, in particular to can external flexible tube's explosion-proof terminal box of high accuracy for weighing module.

Background

The explosion-proof junction box is a connection protection piece with the advantage of sealing performance in explosion-proof electric line laying, a binding post is used inside for connecting various cables and serially connecting a plurality of boxes, and the box body and the upper cover adopt a sealing technology, so that the connection part of the cables and the inner PCB are sealed and protected.

Wherein, the high-precision junction box used by the weighing module is used for connecting a plurality of analog weighing sensors (the signal output is 2mV/V or 3mV/V generally) to a weighing instrument.

Fig. 1 is a schematic structural diagram of a junction box in the prior art. As shown in fig. 1, a conventional terminal box cable is directly connected to a PCB inside a box through a cable lead-in device, and then the cable lead-in device is locked by a nut, and a cable line without any protection is provided.

However, with the initiative of the fourteen-five planning of the country in recent years, the security production of the country and the enterprises is more and more emphasized, and the requirement for equipment used in the dangerous environment is higher and higher. Among them, in section 15 of "GB/T3836.15 explosive Environment: the design, selection and installation of electrical devices teaches that cables with low sheath tensile strength (known as "easy peel" cables) cannot be used in hazardous locations unless installed in a conduit.

However, the common junction boxes in the market are all in the form of straight cables, the outside of the joint is not connected with the guide pipe, the cable is not protected by the joint, and the requirements for use in a severe explosive environment cannot be met. In this case, an additional box is often required to be added for placing the cable, which brings unnecessary trouble.

Meanwhile, the junction box is generally manufactured by sheet metal parts, the wall surfaces of the sheet metal parts are selected to be thinner in order to save cost, and threaded holes cannot be punched. It is common practice, in general, to connect a fitting to a housing: the wall surface of the shell is made into a unthreaded hole, and the shell is locked by the nut, but the junction box is generally made to be compact in order to meet the universality of different occasions, and the nut is used inside to lock the joint, so that the moment is required to be exerted from the inside, and great inconvenience is brought to installation.

In view of the above, the present inventors have devised a high-precision explosion-proof junction box for a weighing module that can be externally connected with a flexible tube, in order to overcome the above technical problems.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that in order to overcome prior art terminal box all is the straight-out cable form, can't play the defect of the effect of protection to the cable, provide a high accuracy explosion-proof terminal box for weighing module that can external flexible pipe.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a high-precision explosion-proof junction box capable of being externally connected with a flexible pipe and used for a weighing module is characterized by comprising a shell, at least one joint, an upper cover and a PCB, wherein the side wall surface of the shell is provided with at least one inner punched hole flanging with internal threads, and the joint is in threaded connection with the hole flanging and is used for connecting an external cable; the PCB is fixed in the shell, and the upper cover is buckled and connected with the shell up and down.

According to the utility model discloses an embodiment, connect including external screw nut, joint body, seal gasket and inner core assembly, external screw nut with joint body interconnect, inner core assembly installs it is internal to connect, seal gasket cover is in connect on the external screw thread of body one end.

According to the utility model discloses an embodiment, the inner core subassembly includes obstruction piece, sealing member and core cover, the sealing member cover is established the upper portion of obstruction piece, the core cover is established the lower part of obstruction piece, just the sealing member with the obstruction piece combines from top to bottom.

According to the utility model discloses an embodiment, connect still to include inside O type circle and outside O type circle, inside O type circle is installed connect the body with between the core cover, outside O type circle is installed on the external screw nut who connects.

According to an embodiment of the present invention, the sealing gasket is made of teflon.

According to the utility model discloses an embodiment, the external screw thread of external screw thread nut is connected with outside flexible pipe for locking the cable.

According to the utility model discloses an embodiment, the upper cover with be provided with sealed the pad between the casing, sealed pad with leave the clearance around the upper cover.

According to an embodiment of the present invention, the sealing gasket is made of neoprene.

According to the utility model discloses an embodiment, two connecting portion are outwards bent out in the both sides of upper cover, a plurality of unthreaded holes have been seted up on the connecting portion, the both sides of casing are provided with a plurality of lugs, each set up threaded hole on the lug, the upper cover passes through the connecting piece the unthreaded hole the screw hole with the casing is connected.

According to the utility model discloses an embodiment, the bottom welding of casing has a plurality of internal thread double-screw bolts, the PCB board pass through the screw with the cooperation of internal thread double-screw bolt is fixed casing bottom.

The utility model discloses an actively advance the effect and lie in:

the utility model discloses explosion-proof terminal box of high accuracy for weighing module that can external flexible tube has following a great deal of advantage:

1. the connector is provided with an external thread nut, and can be directly connected with a flexible pipe of a user, so that the cable is protected, the junction box can be used in occasions with higher safety requirements, and the use places of the junction box are widened.

2. The shell adopts a hole flanging process to process a threaded hole in the wall surface of the shell to replace the traditional scheme of locking by using a nut, so that the problem of inconvenience in installation caused by limited internal space of the junction box is solved, and a feasible scheme is provided for processing the threaded hole in the thin-wall surface.

3. The upper cover of the junction box is made of chloroprene rubber, the joint and the shell are sealed by PTFE gaskets, the performance of the selected materials of the whole sealing scheme is reliable, the sealing performance is good, and the junction box can meet the dustproof and waterproof requirements of IP68 and IP 69K. The high-performance IP can isolate the inside of the junction box and the surrounding environment, so that the whole system of the junction box is more completely reliable.

4. The PCB board that the terminal box used can guarantee that a plurality of weighing module can be connected to the terminal box, can carry out the angular difference and adjust to have and exempt from to mark the function.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which like reference characters refer to like features throughout, and in which:

fig. 1 is a schematic structural diagram of a junction box in the prior art.

Fig. 2 is an explosion diagram of the high-precision explosion-proof junction box for the weighing module of the utility model, which can be externally connected with a flexible pipe.

Fig. 3 is the utility model discloses can connect the cooperation sketch map of joint and casing in the high accuracy explosion-proof terminal box for the weighing module of external flexible pipe.

Fig. 4 is a front view of the high-precision explosion-proof junction box for the weighing module, which can be externally connected with a flexible pipe.

Fig. 5 is a side view of the high-precision explosion-proof junction box for the weighing module of the utility model, which can be externally connected with a flexible pipe.

Fig. 6 is a top view of the high-precision explosion-proof junction box for the weighing module, which can be externally connected with a flexible pipe.

Fig. 7 is the structure diagram of the joint in the high-precision explosion-proof junction box for the weighing module of the utility model which can be externally connected with the flexible pipe.

Fig. 8 is a perspective view of the high-precision explosion-proof junction box middle joint for the weighing module, which can be externally connected with a flexible pipe.

Fig. 9 is the screw hole schematic diagram of the shell adopting the hole flanging process to process in the high-precision explosion-proof junction box for the weighing module capable of externally connecting the flexible pipe.

Fig. 10 is a schematic structural view of the housing in the high-precision explosion-proof junction box for the weighing module, which can be externally connected with the flexible tube.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.

Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

As shown in fig. 2 to 10, the utility model discloses a high-precision explosion-proof junction box for weighing module that can connect flexible pipe externally, which comprises a housing 10, at least one joint 20, an upper cover 30 and a PCB board 40. At least one inner punched hole 11 with internal threads is arranged on the side wall surface of the shell 10, and the connector 20 is screwed in the hole 11 and is used for connecting an external cable. A PCB (printed circuit board) 40 is fixed in the housing 10, and the upper cover 30 is vertically fastened to the housing 10.

Preferably, the coupling 20 may include an externally threaded nut 21, a coupling body 22, a sealing gasket 23, and a core assembly for interconnecting the externally threaded nut 21 and the coupling body 22, the core assembly being installed in the coupling body 22, and the sealing gasket 23 being fitted over the external threads of one end of the coupling body 22.

Here, the core assembly may preferably include a stopper 24, a sealing member 25, and a core sleeve 26. Wherein, the sealing element 25 is sleeved on the upper part of the plugging element 24, the core sleeve 26 is sleeved on the lower part of the plugging element 24, and the sealing element 25 and the plugging element 24 are combined up and down.

Additionally, the fitting 20 may also include an inner O-ring 27 and an outer O-ring 28. Wherein an inner O-ring 27 is mounted between the coupling body 22 and the core sleeve 26 and an outer O-ring 28 is mounted on the externally threaded nut 21 of the coupling 20.

The sealing gasket 23 may preferably be made of polytetrafluoroethylene. The external thread of the externally threaded nut 21 is connected to the outer flexible tube for tightening the cable.

Specifically, the sealing gasket 23 is fitted over the external thread a at one end of the joint body 22, and the wall surface of the housing is provided with an internal thread hole by a hole flanging process, so that the sealing effect is achieved by applying a moment to the joint body using the sealing gasket. The preferred material for the sealing gasket 23 is polytetrafluoroethylene. The external thread B at the other end of the connector body 22 is connected with the external thread nut 21, an O-shaped ring and a sealing piece inside the connector play a role in dustproof and waterproof sealing, the core sleeve 26 is used for clamping a cable, and the blocking piece 24 prevents external foreign matters or dust from entering the inside of the junction box. The external thread nut 21 is used for locking a cable, and external threads outside the external thread nut can be directly connected with the flexible pipe, so that the cable is protected, and the requirement for use in a severe environment can be met.

Further, a gasket 50 is disposed between the upper cover 30 and the housing 10, and a gap is left between the gasket 50 and the periphery of the upper cover 30. The gasket 50 is preferably made of neoprene.

For example, the upper cover 30 and the gasket 50 are bonded together by glue, and a certain gap is left between the gasket 50 and the upper cover 30 to ensure the sealing effect, and the gap is determined according to the compression performance of the gasket material. The preferable material of the gasket 50 may be neoprene, which has excellent sealing properties and physical and mechanical properties, and is commonly used as a sealing material.

Two connecting portions 31 are bent outwards from two sides of the upper cover 30, a plurality of unthreaded holes 32 are formed in the connecting portions 31, a plurality of lifting lugs 12 are arranged on two sides of the shell 10, each lifting lug 12 is provided with a threaded hole 13, and the upper cover 30 passes through the unthreaded holes 32 and the threaded holes 13 through a connecting piece 60 and is connected with the shell 10.

For example, four unthreaded holes 32 are drilled in two plates (i.e., the connecting portions 31) bent by the upper cover 30, screws pass through the four unthreaded holes to be connected with the housing 10, four lifting lugs 12 are welded on the housing 10, and threaded holes are drilled on the lifting lugs of the upper cover. In order to prevent the loss of the screw (i.e. the connecting piece 60) during the disassembly and assembly, the screw is sleeved with an O-shaped ring 61, and the inner diameter of the O-shaped ring 61 is larger than the diameters of the four unthreaded holes.

In addition, a plurality of female screw studs are welded to the bottom of the housing 10, and the PCB 40 is fixed to the bottom of the housing 10 by screws in a manner of being fitted to the female screw studs.

For example, four female screw studs are welded to the bottom of the housing 21, and the PCB board 40 is fixed to the bottom of the housing 10 by screws 41. The PCB 40 can realize calibration-free and angle difference adjustment, supports a plurality of junction box access systems, and is connected with any number of weighing sensors, 2, 3 and 4, and can be connected with 4 weighing sensors at most. The wall of the shell 10 is welded with a bolt 14, and a nut 15 is connected to the bolt 14 and used for grounding the shell of the junction box, so that the junction box is safer and more reliable.

Preferably, in this embodiment, 6 connectors are connected to the housing 10, wherein four connectors are identical at the four sides, mainly as sensor cable lead-in devices, and two connectors are identical at the middle, mainly as lead-in devices of signal cables, for connecting another junction box in series. The wall surface of the shell 10 is provided with an internal thread hole through a hole flanging process, so that the installation is more convenient compared with the direct locking by a nut.

According to the above description, the utility model discloses explosion-proof terminal box of high accuracy is used to weighing module that can external flexible tube when the equipment, embolias seal gasket on the joint body that connects earlier, then twists the internal thread hole of casing wall together, then uses the moment of regulation to lock, inserts the casing with weighing module and instrument cable again, locks with the external screw thread nut at last. The grounding cable is connected to a bolt welded on the shell and is locked by a nut, so that the effect of safe grounding is achieved. Finally, the upper cover is screwed down.

In the use process of the junction box, any interface of four interfaces of the cable of the weighing module is randomly selected to be led into the interior of the junction box and a terminal corresponding to a PCB in the junction box to be connected, a cable of the connecting instrument is connected into the interior of the junction box through a joint port corresponding to the junction box and is connected with the PCB, and the junction box allows another junction box to be connected in series and is connected through a middle joint of the junction box.

In the actual use process, if the number of the connected weighing modules is less than 4, the redundant connectors are plugged by the plugging pieces, so that the dustproof and waterproof effects are achieved.

The utility model discloses the explosion-proof terminal box of high accuracy for weighing module that can external flexible tube can be used to in combustible dust environment and the explosive gas environment, has characteristics such as multi-functional, maintain simple, good reliability.

The cable protection device can be externally connected with a flexible pipe to protect a cable, and meanwhile, a hole flanging process is used, a threaded hole is punched in the wall surface of the shell through a die, so that inconvenience caused by limited installation space can be reduced.

To sum up, the utility model discloses the explosion-proof terminal box of high accuracy for weighing module that can external flexible tube has following a great deal of advantage:

1. the connector is provided with an external thread nut, and can be directly connected with a flexible pipe of a user, so that the cable is protected, the junction box can be used in occasions with higher safety requirements, and the use places of the junction box are widened.

2. The shell adopts a hole flanging process to process a threaded hole in the wall surface of the shell to replace the traditional scheme of locking by using a nut, so that the problem of inconvenience in installation caused by limited internal space of the junction box is solved, and a feasible scheme is provided for processing the threaded hole in the thin-wall surface.

3. The upper cover of the junction box is made of chloroprene rubber, the joint and the shell are sealed by PTFE gaskets, the performance of the selected materials of the whole sealing scheme is reliable, the sealing performance is good, and the junction box can meet the dustproof and waterproof requirements of IP68 and IP 69K. The high-performance IP can isolate the inside of the junction box and the surrounding environment, so that the whole system of the junction box is more complete and reliable.

4. The PCB board that the terminal box used can guarantee that a plurality of weighing module can be connected to the terminal box, can carry out the angular difference and adjust to have and exempt from the function of maring.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are all within the scope of the invention.

Claims (10)

1. A high-precision explosion-proof junction box capable of being externally connected with a flexible pipe and used for a weighing module is characterized by comprising a shell, at least one joint, an upper cover and a PCB, wherein the side wall surface of the shell is provided with at least one inner punched hole with internal threads, and the joint is in threaded connection with the hole in the hole and is used for connecting an external cable; the PCB is fixed in the shell, and the upper cover is buckled and connected with the shell up and down.

2. The high-precision explosion-proof junction box for a weighing module capable of externally connecting a flexible pipe according to claim 1, wherein the joint comprises an external screw nut, a joint body, a sealing gasket and an internal core assembly, the external screw nut and the joint body are connected with each other, the internal core assembly is installed in the joint body, and the sealing gasket is sleeved on the external screw at one end of the joint body.

3. The high-precision explosion-proof junction box for a weighing module externally connectable with a flexible pipe according to claim 2, wherein the core assembly comprises a plugging member, a sealing member and a core sleeve, the sealing member is sleeved on the upper part of the plugging member, the core sleeve is sleeved on the lower part of the plugging member, and the sealing member and the plugging member are combined up and down.

4. A high precision explosion proof junction box for a flexible pipe circumscribed weighing module as in claim 3 wherein said fitting further comprises an inner O-ring mounted between said fitting body and said core housing and an outer O-ring mounted on an externally threaded nut of said fitting.

5. The high-precision explosion-proof junction box for a weighing module capable of externally connecting a flexible pipe according to claim 2, wherein the sealing gasket is made of polytetrafluoroethylene.

6. The high-precision explosion-proof junction box for a weighing module capable of externally connecting a flexible pipe according to claim 2, wherein the external thread of the external thread nut is connected with an external flexible pipe for locking a cable.

7. The high-precision explosion-proof junction box for a weighing module capable of externally connecting a flexible pipe according to claim 1, wherein a sealing gasket is arranged between the upper cover and the shell, and a gap is left between the sealing gasket and the periphery of the upper cover.

8. The high-precision explosion-proof junction box for a weighing module capable of externally connecting a flexible pipe according to claim 7, wherein the sealing gasket is made of neoprene.

9. The high-precision explosion-proof junction box for a weighing module capable of externally connecting a flexible pipe according to claim 1, wherein two connecting parts are bent outwards from two sides of the upper cover, the connecting parts are provided with a plurality of unthreaded holes, a plurality of lifting lugs are arranged on two sides of the housing, each lifting lug is provided with a threaded hole, and the upper cover is connected with the housing by a connecting piece penetrating through the unthreaded holes and the threaded holes.

10. The high-precision explosion-proof junction box for the weighing module capable of externally connecting the flexible pipe as claimed in claim 1, wherein a plurality of internally threaded studs are welded to the bottom of the housing, and the PCB is fixed to the bottom of the housing by being matched with the internally threaded studs through screws.

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