Patent Publication Number: US-9899763-B2

Title: Industrial plug used for marine container

Description:
TECHNICAL FIELD 
     The present invention relates to an industrial plug, and more specifically, to an industrial plug for a marine container. 
     BACKGROUND OF THE INVENTION 
     On marine containers, an industrial plug serves as a common power receiving interface in a transportation process of the containers. General requirements and dimensional interchangeability requirements of the industrial plug need to meet a standard IEC60309. As shown in  FIG. 1 , different colors are used for displaying different rated voltages of products in the standard IEC60309. For example, a plug or a socket with a rated voltage of 380-480V AC is red. In addition, as specified in the international standard IEC60309, an industrial red plug or socket which has a rated voltage of 380V AC, 50Hz and 3P+E (3P+earthed) and has an earthing contact in a 3 h position (a 3 o&#39;clock direction, referring to a front view of the plug for a clock position) is only used for a power receiving interface apparatus of an ISO standardized refrigerated vessel (that is, a refrigerated container). However, an industrial plug or socket product which has a rated voltage of 380-415V AC, a 50/60 Hz and 3P+E (3P +earthed) and has an earthing contact in a 6 h position (a 6 o&#39;clock direction) is internationally applied widest and most universally. 
     In an international logistics transportation industry, many containers need to be under live work in the transportation process to control temperatures in the containers. Now an actual condition is that: when the containers are positioned in a place A, a power transmission interface of an industrial red socket which has a rated voltage of 380V AC, 50 Hz and 3P+E (3P+earthed) and has an earthing contact in a 3 h position (a 3 o&#39;clock direction) is arranged in the place A, but when the containers are positioned in a place B, such a power transmission interface is not arranged in the place B, and only a power transmission interface of an industrial red socket which has a rated voltage of 380-415V AC, 50/60 Hz and 3P+E (3P+earthed) and has an earthing contact in a 6 h position (a 6 o&#39;clock direction) is arranged. At this moment, a user has to replace the power receiving plug interface of the containers, that is, use the 6 h plug to replace the 3 h plug, thereby guaranteeing normal power supply of the containers. Great inconvenience is brought to users due to a problem of poor universality in an existing industrial plug. 
     SUMMARY OF THE INVENTION 
     A technical problem to be solved in the present invention is that an existing industrial plug is poor in universality and brings great inconvenience to customer use. 
     In order to solve the technical problem above, a technical solution adopted in the present invention is as follows: an industrial plug for a marine container is provided, comprising a plug base, wherein a plug sealing sheath component is screwed to an upper end of the plug base; an insertion core fixing plate is sleeved on the plug base, wherein a plurality of wiring insertion core components are arranged on the insertion core fixing plate in a surrounding manner in sequence; a plug pressing plate matched with the wiring insertion core components is sleeved at upper ends of the wiring insertion core components; a through hole is formed in a center of the insertion core fixing plate; a rotary braking pin penetrates through the through hole from bottom to top; the rotary braking pin comprises a braking pin base and a rotary base extending out of one side of the braking pin base; an outer end of the rotary base is provided with a rotary clamping block; a lower end of the braking pin base protrudes downwards to form a braking stopping block matched with the through hole; an upper end of the braking pin base protrudes upwards to form a rotary shaft; a braking compression spring is sleeved on the rotary shaft; an upper end of the rotary shaft is abutted against the plug pressing plate; a first clamping groove and a second clamping groove are respectively formed at an interval in an inner side of the plug base; a slide rail is arranged between the first clamping groove and the second clamping groove; the rotary clamping block is arranged in the first clamping groove or the second clamping groove; and the braking stopping block is lifted upwards and rotated to drive the rotary clamping block to rotate from the first clamping groove or the second clamping groove to enter the second clamping groove or the first clamping groove and further drive the wiring insertion core components to make adaptive position switching. 
     In the solution above, the wiring insertion core components comprise an earthing insertion core component and a plurality of live wire insertion core components, and the rotary braking pin is arranged between the earthing insertion core component and one adjacent live wire insertion core component. 
     In the solution above, the rotary clamping block drives the insertion core fixing plate and the plug pressing plate to rotate and further drives the earthing insertion core component to rotate; when the rotary clamping block is positioned in the first clamping groove, the earthing insertion core component is in a first position; and when the rotary clamping block is positioned in the second clamping groove, the earthing insertion core component is in a second position. 
     In the solution above, the first position is in a 3 o&#39;clock direction, and the second position is in a 6 o&#39;clock direction. 
     In the solution above, a threaded hole is formed in the rotary base, and a fastening bolt penetrates through the threaded hole to fix the rotary braking pin to the insertion core fixing plate. 
     In the solution above, the plug sealing sheath component comprises a sealing sheath body, and a locking nut and a locking ring positioned on two sides of the sealing sheath body. A wire tightening and sealing plug is sleeved in the locking nut. An O-shaped sealing ring is arranged in the locking ring. A lower end of the sealing sheath body is screwed and sleeved on the plug base. 
     In the solution above, an annular rib is arranged on an upper part of the plug base, and a waterproof plug sealing washer is fixedly bonded to a lower part of the annular rib through a sealant. 
     In the solution above, a rotary shaft sleeve is arranged on the plug pressing plate in a position corresponding to the rotary shaft; and when a lower surface of the braking stopping block is flush with a lower surface of the insertion core fixing plate, a section of gap is formed between the rotary shaft and an inner upper end surface of the rotary shaft sleeve. 
     According to the present invention, the rotary braking pin penetrates through the central through hole of the insertion core fixing plate from bottom to top, the first clamping groove and the second clamping groove are respectively formed at an interval in the inner side of the plug base, the slide rail is arranged between the two clamping grooves, and the rotary braking pin is lifted upwards and rotated to drive the wiring insertion core components to switch moment directions, thereby realizing multiple purposes by one object, simple and flexible switching and strong universality and bringing great convenience to customer use. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a classification diagram of voltages and colors of an industrial plug or socket in IEC60309. 
         FIG. 2  is an exploded diagram of the present invention. 
         FIG. 3  is a structural schematic diagram of the present invention. 
         FIG. 4  is a front view of the present invention. 
         FIG. 5  is a structural schematic diagram of a plug base in the present invention. 
         FIG. 6  is a structural schematic diagram of a rotary braking pin in the present invention. 
         FIG. 7  is an assembly diagram of a plug base, an insertion core fixing plate and a rotary braking pin in the present invention. 
         FIG. 8  is a structural schematic diagram of the present invention after disassembly of a plug sealing sheath component. 
         FIG. 9  is a rear view of  FIG. 7 . 
         FIG. 10  is a sectional view of  FIG. 3  along A-A direction. 
         FIG. 11  is an exploded diagram of a plug sealing sheath component in the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention is described below in detail in combination with drawings of the specification. 
     As shown in  FIG. 1 ,  FIG. 5  and  FIG. 11 , the present invention provides an industrial plug for a marine container. The industrial plug comprises a plug base  10 , a plug pressing plate  20 , an insertion core fixing plate  40  and a plug sealing sheath component. The plug sealing sheath component is screwed to an upper end of the plug base  10  and is used for sealing and protecting the plug base  10 . The plug sealing sheath component comprises a sealing sheath body  30 , a locking nut  32  and a locking ring  31 . The locking nut  32  and the locking ring  31  are respectively positioned on an upper part and a lower part of the sealing sheath body  30  and screwed and connected to an outer side of the sealing sheath body  30 . A wire tightening and sealing plug  34  is sleeved in the locking nut  32 . A sealing groove is formed in the locking ring  31  on the lower part of the sealing sheath body  30 . An O-shaped sealing ring is arranged in the sealing groove. The sealing sheath body  30  and an upper end of the plug base  10  form a sealing structure through the O-shaped sealing ring. The sealing structure can achieve a sealing effect when the plug is connected with a socket. A lower end of the sealing sheath body  30  is screwed and sleeved on the plug base  10 . 
     A plurality of first screwing ribs  17  are arranged on the plug base  10  at intervals. A plurality of second screwing ribs which can be adaptively clamped are arranged at corresponding positions on an inner side of the sealing sheath body  30 . The second screwing ribs can push the first screwing ribs  17  to rotate so as to drive the plug base  10  to rotate when the sealing sheath body  30  is screwed each time. An annular rib  16  is arranged on an upper part of the plug base  10 . A waterproof plug sealing washer  15  is fixedly bonded to a lower part of the annular rib  16  through a sealant. 
     In combination with  FIG. 2 ,  FIG. 3  and  FIG. 4 , an anti-misplug convex block  14  is arranged at a lower end on an outer side of the plug base  10 , and when a user inserts the industrial plug into a pin, the user can be helped to rapidly find an accurate direction by referring to a position corresponding to the anti-misplug convex block  14 , thereby saving time. An insertion core fixing plate  40  is sleeved on the plug base  10 . A plurality of wiring insertion core components are arranged on the insertion core fixing plate  40  in a surrounding manner in sequence. The wiring insertion core components comprise an earthing insertion core component  41  and a plurality of live wire insertion core components  42 , wherein the earthing insertion core component  41  is used for connecting an earth wire, and the live wire insertion core components  42  are used for connecting a live wire. In the present invention, the quantity of the live wire insertion core components  42  is three, and a position of the earthing insertion core component  41  determines whether the industrial plug is in a 3 h position (a 3 o&#39;clock direction) or a 6 h position (a 6 o&#39;clock direction). An annular protection plate  43  is arranged on the insertion core fixing plate  40  in a position corresponding to each of the wiring insertion core components. A slotted hole is formed in a side surface on an upper part of each annular protection plate  43 . The wiring insertion core components penetrate through the slotted holes and are fixed to the insertion core fixing plate  40  through screws. 
     In combination with  FIG. 5 ,  FIG. 6 ,  FIG. 7 ,  FIG. 8  and  FIG. 9 , a plug pressing plate  20  matched with the wiring insertion core components is sleeved at an upper end of the wiring insertion core components. A matched notch  21  is formed in the plug pressing plate  20  in a position corresponding to the slotted hole in each annular protection plate  43 , so as to facilitate assembly and disassembly of the screw. A matched round hole  22  is formed in the plug pressing plate  20  in a position corresponding to an upper end of each of the wiring insertion core components, so as to facilitate wiring. A through hole is formed in the center of the insertion core fixing plate  40 . A rotary braking pin  50  penetrates through the through hole from bottom to top. The rotary braking pin  50  is arranged between the earthing insertion core component  41  and one adjacent live wire insertion core component  42 . 
     The rotary braking pin  50  comprises a braking pin base  52  and a rotary base  53  extending out of one side of the braking pin base  52 . An outer end of the rotary base  53  is provided with a rotary clamping block  54 . A lower end of the braking pin base  52  protrudes downwards to form a braking stopping block  56  matched with the through hole in the center of the insertion core fixing plate  40 . The braking stopping block  56  can slide up and down in the through hole in the center of the insertion core fixing plate  40 . A threaded hole  57  is formed in the rotary base  53 , and a fastening bolt penetrates through the threaded hole  57  to fix the rotary braking pin  50  to the insertion core fixing plate  40 . Therefore, when the rotary braking pin  50  rotates, the plug pressing plate  20  and the insertion core fixing plate  40  can be simultaneously driven to rotate. 
     In combination with  FIG. 10 , an upper end of the braking pin base  52  protrudes upwards to form a rotary shaft  55 . A braking compression spring  51  is sleeved on the rotary shaft  55 . An upper end of the rotary shaft  55  is abutted against the plug pressing plate  20 . A rotary shaft sleeve  23  is arranged on the plug pressing plate  20  in a position corresponding to the rotary shaft  55 . When a lower surface of the braking stopping block  56  is flush with a lower surface of the insertion core fixing plate  10 , a section of gap is formed between the rotary shaft  55  and an inner upper end surface of the rotary shaft sleeve  23 , and the rotary shaft  55  can move up and down in the gap. 
     A first clamping groove  11  and a second clamping groove  12  are respectively formed at an interval in an inner side of the plug base  10 . A slide rail  13  is arranged between the first clamping groove  11  and the second clamping groove  12 . The rotary clamping block  54  slides on the slide rail  13  and can enter the second clamping groove  12  from the first clamping groove  11  or enter the first clamping groove  11  from the second clamping groove  12 . When the rotary clamping block  54  is arranged in the first clamping groove  11 , a position of the earthing insertion core component  41  is in a first position, that is a 3 o&#39;clock direction (or a 6 o&#39;clock direction); and when the rotary clamping block  54  slides into the second clamping groove  12 , the earthing insertion core component  41  is rotated to a second position. According to the present invention, the first position is preferably the 3 o&#39;clock direction, and the second position is preferably the 6 o&#39;clock direction. By switching the positions of the rotary clamping block  54 , the earthing insertion core component  41  can be flexibly switched between the 3 o&#39;clock direction and the 6 o&#39;clock direction. 
     In combination with  FIG. 3  and  FIG. 9 , when the rotary clamping block  54  is switched, the braking stopping block  56  only needs to be slightly lifted upwards by a certain distance by virtue of a screwdriver or other external force, the braking stopping block  56  is simultaneously rotated to drive the rotary braking pin  50  to rotate, and the rotary clamping block  54  is further driven to rotate to enter the second clamping groove  12  (or the first clamping groove  11 ) from the first clamping groove  11  (or the second clamping groove  12 ), thereby completing switching of the positions of the rotary clamping block  54 . Because gaps exist among the plug pressing plate  20 , the insertion core fixing plate  40  and inner walls of the plug base  10 , the rotary braking pin  50  is rotated to simultaneously drive the plug pressing plate  20  and the insertion core fixing plate  40  to rotate, and also drive the earthing insertion core component  41  to switch from the 3 o&#39;clock direction (or the 6 o&#39;clock direction) to the 6 o&#39;clock direction (or the 3 o&#39;clock direction). After switching is ended, the screwdriver is loosened and the braking stopping block  56  is returned to an original position under an effect of a restoring force of the compression spring  51 . The industrial plug is simple and convenient in operation and has very high practical value. 
     According to the present invention, the rotary braking pin penetrates through the central through hole of the insertion core fixing plate from bottom to top, the first clamping groove and the second clamping groove are respectively formed at an interval in the inner side of the plug base, the slide rail is arranged between the two clamping grooves, and the rotary braking pin is lifted upwards and rotated to drive the wiring insertion core components to switch moment directions, thereby realizing multiple purposes by one object, simple and flexible switching and strong universality and bringing great convenience to customer use. 
     The present invention is not limited to the optimal embodiments above. Any person should know structural changes made under an inspiration of the present invention and all technical solutions which are the same as or close to those in the present invention should be included in the protection scope of the present invention.