CN220272879U - Explosion-proof charging gun for civil and mining - Google Patents

Abstract

The application relates to the field of charging guns and discloses a civil and mining general explosion-proof charging gun which comprises a plug and a socket, wherein an insulating tube is arranged in the socket in a split mode, and a mining standard gap is met between the outer wall of the insulating tube and the inner wall of the plug; the plug is characterized by further comprising a locking mechanism, wherein the locking mechanism comprises a first locking part, a second locking part and a third locking part, a guide block is detachably arranged on the plug, the first locking part locks the guide block, the second locking part locks the first locking part, and the third locking part is arranged on the plug and locks the plug seat. The utility model has the form that can peg graft fixedly through adopting insulating tube and socket components of a whole that can function independently, make insulating tube outer wall and plug inner wall's clearance can satisfy mining standard clearance, use triple locking part to lock plug and socket, satisfy the requirement of mining flame proof rifle that charges, dismantle the guide block on the plug and take off, can make the rifle that charges be applicable to civilian to make the rifle that charges can be applicable to civilian charging, can be applicable to mining flame proof again.

Description

Explosion-proof charging gun for civil and mining

Technical Field

The application relates to the field of charging guns, in particular to a civil and mining general explosion-proof charging gun.

Background

The civil charging gun is mostly used for charging new energy automobiles, and the mining charging gun is mostly used for charging flameproof new energy automobiles for coal mines, other charging equipment for coal mines and the like.

Currently, a charging gun comprises a socket and a plug, and the charging gun can be used by inserting the plug into the socket. In the civil charging gun, an insulating tube is integrally injection-molded in the socket, when the plug is inserted into the socket, the insulating tube is inserted into the plug, and in the use standard of the civil charging gun, the gap range between the outer wall of the insulating tube and the inner wall of the plug is 2-3 mm. Because the mining charging gun is mainly used for coal mine sites, explosive gas mixtures such as coal dust, methane and the like are arranged around the mining charging gun, and the mining charging gun is required to have an explosion-proof function. In order to enable the mining charging gun to have an explosion-proof function, in the use standard of the mining charging gun, the gap between the outer wall of the insulating tube and the inner wall of the plug is required to be smaller than or equal to 0.4mm (the gap range is called a mining standard gap), and meanwhile, the plug and the socket are required to be firmly locked before each other.

Because the insulating tube is integrally injection molded in the socket, the gap between the outer wall of the insulating tube and the inner wall of the plug is difficult to meet the standard gap for mining, and meanwhile, the plug and the socket of the civil charging gun are difficult to form stable locking, so that the civil charging gun and the mining charging gun cannot be used universally.

Disclosure of Invention

In order to solve the problem that civil charging guns and mining charging guns cannot be used universally, the application provides a civil and mining explosion-proof charging gun.

The application provides a general flame proof rifle that charges in civil and mining adopts following technical scheme:

the explosion-proof charging gun for civil and mining use comprises a plug and a socket, wherein an insulating tube is arranged in the socket in an inserted manner, and a standard gap for mining is met between the outer wall of the insulating tube and the inner wall of the plug; the socket is characterized by further comprising a locking mechanism, the locking mechanism comprises a first locking part, a second locking part and a third locking part, a guide block is detachably arranged on the plug, the guide block is slidably inserted into the socket, the first locking part is arranged on the socket and locks the guide block, the second locking part is arranged on the plug and locks the first locking part, and the third locking part is arranged on the plug and locks the socket.

Through adopting above-mentioned technical scheme, insulating tube and socket adopt the fixed form of components of a whole that can function independently grafting to make the clearance between insulating tube outer wall and the plug inner wall can satisfy mining standard clearance, after the plug inserts the socket, the plug drives the guide block and inserts the socket, uses first locking part on the socket to lock the guide block earlier, uses second locking part to lock first locking part at first earlier, uses third locking part to lock plug and socket at last, makes and forms firm locking between plug and the socket, thereby satisfies the requirement of mining flame proof rifle that charges. The guide block on the plug is detached and taken down, so that the charging gun is suitable for civil use. By the arrangement, the charging gun can be suitable for civil charging and mining explosion-proof charging, and the applicability of the charging gun is improved.

Preferably, the first locking part comprises a locking shell and a first bolt, the locking shell is arranged on the socket, the first bolt is arranged on the locking shell in a sliding manner, a locking groove is formed in the side wall, close to the first bolt, of the guide block, and the first bolt is arranged in the locking groove in a sliding insertion manner.

Through adopting above-mentioned technical scheme, when the plug drove the guide block and inserts in the socket, slide first bolt in the locking shell, first bolt moves towards being close to the guide block direction, and when first bolt moved and pegged graft and fix in the locked groove, first bolt locked the guide block to form first level locking to plug and socket.

Preferably, the second locking part comprises a driving piece and a second bolt, the driving piece is arranged in the plug, the second bolt is arranged in the plug in a sliding manner along the direction perpendicular to the sliding direction of the first bolt and is in transmission connection with the driving piece, a locking ring groove is formed in the outer side wall of the first bolt, and the second bolt is arranged in the locking ring groove in a sliding manner.

Through adopting above-mentioned technical scheme, after the first bolt locks the guide block, the driving piece drive second bolt removes towards being close to first bolt direction, and when the second bolt removed and peg graft and fix in the locking annular, the second bolt locks first bolt to form the second grade locking to plug and socket.

Preferably, the third locking portion includes a locking bolt slidably disposed within the plug and the locking bolt is threadedly secured within the socket.

By adopting the technical scheme, after the plug is inserted into the socket, the locking bolt in the plug is rotated, and the locking bolt is fixed in the socket in a threaded manner, so that third-stage locking is formed on the plug and the socket.

Preferably, the locking shell is rotationally provided with a rotating shaft, the rotating shaft is provided with driving teeth, a strip-shaped tooth slot is formed on the side wall, close to the driving teeth, of the guide block, and the teeth of the driving teeth are meshed with the strip-shaped tooth slot.

Through adopting above-mentioned technical scheme, when the plug drove the guide block and get into in the socket, rotate the pivot, the pivot drives the driving tooth and rotates, the driving tooth moves through the bar tooth's socket drive guide block with self meshing to in the plug inserts the socket of being convenient for.

Preferably, the locking shell is provided with an unlocking hole, and the unlocking hole is communicated with the locking ring groove.

Through adopting above-mentioned technical scheme, when the driving piece of second locking portion breaks down, insert the locking shell with the shaft-like piece from the unlocking hole in, the shaft-like piece inserts in the locking annular, can promote second bolt roll-off locking annular to when making the driving piece break down, still can unlock plug and socket.

Preferably, the plug is provided with a limiting sliding groove, the guide block is provided with a limiting sliding block, the limiting sliding block is arranged in the limiting sliding groove in a sliding manner in a matching manner, the guide block is provided with a fixing bolt, and the fixing bolt penetrates through the guide block and is fixed in the plug through the bolt.

Through adopting above-mentioned technical scheme, rotate fixing bolt and can carry out the dismouting to the guide block, simultaneously, spacing slider on the guide block cooperates with spacing spout in the plug for the guide block is more stable on the plug installation.

Preferably, the guide block is provided with an inserting block, the plug is provided with a slot, the inserting block is in sliding connection with the slot in an adapting manner, the plug is provided with a jack communicated with the slot along the direction vertical to the slot, the jack is internally provided with a limiting pin in a sliding manner, and the limiting pin penetrates through the inserting block.

Through adopting above-mentioned technical scheme, insert the plug on the wire piece in inserting the slot of plug, insert the plug from the jack in again, the spacer pin inserts the plug and runs through the spacer pin to fix the spliced eye, and then fix the guide block, when the guide block needs to be dismantled, slide and pull out the spacer pin and can slide and dismantle the guide block. So set up for the dismouting of guide block is convenient and fast more.

Preferably, one end of the limiting pin is rotatably provided with a blocking pin, the middle part of the blocking pin is rotatably connected with the limiting pin, the blocking pin is abutted against the outer side wall of the plug, the end part of the limiting pin, which is far away from the blocking pin, is provided with a baffle, one end of the limiting pin, which is far away from the blocking pin, is detachably sleeved with a limiting sleeve, and two ends of the limiting sleeve are respectively abutted against the baffle and the outer side wall of the plug

Through adopting above-mentioned technical scheme, after the spacer pin runs through the plug of inserting, rotate the spacer pin of spacer pin tip for spacer pin perpendicular to spacer pin, reverse pulling spacer pin again makes the spacer pin support tightly on an lateral wall of plug, establishes the stop collar cover in the spacer pin other end of keeping away from the spacer pin, and the baffle of spacer collar's one end butt spacer pin tip, another lateral wall of other end butt plug, thereby carry out spacing fixed to the spacer pin, make the difficult condition that takes place the slippage of spacer pin when using, charge the rifle.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the adoption of the form that the insulating tube and the socket are fixed in a split plugging manner enables the gap between the outer wall of the insulating tube and the inner wall of the plug to meet the standard gap for mining, and the triple locking part is used for locking the plug and the socket, so that stable locking is formed between the plug and the socket, the requirement of a mining explosion-proof charging gun is met, and the guide block on the plug is detached and taken down, so that the charging gun is suitable for civilian use, and therefore, the charging gun is suitable for civilian charging and also suitable for mining explosion-proof charging;

2. the guide block is driven to move by adopting the rotating shaft and the driving teeth, so that the plug is convenient to insert into the socket;

3. by adopting the unlocking hole, when the driving piece of the second locking part fails, the plug and the socket can still be unlocked.

Drawings

Fig. 1 is a schematic view of the overall structure of a charging gun in embodiment 1 of the present application;

FIG. 2 is an exploded view showing the overall structure of the charging gun according to example 1 of the present application;

FIG. 3 is an enlarged schematic view of FIG. 2A of the present application;

fig. 4 is a cross-sectional view showing the overall structure of the charging gun in embodiment 1 of the present application;

FIG. 5 is an enlarged schematic view of FIG. 4B of the present application;

fig. 6 is an exploded schematic view of a part of the structure of the charging gun in embodiment 2 of the present application.

Reference numerals illustrate: 1. a plug; 2. a socket; 3. an insulating tube; 4. a first locking portion; 41. a locking housing; 42. a first latch; 5. a second locking portion; 51. a driving member; 511. an electromagnetic coil; 512. an electromagnet; 52. a second latch; 6. a third locking portion; 61. a locking bolt; 7. a guide block; 8. a locking groove; 9. a locking ring groove; 10. a rotating shaft; 11. a drive tooth; 12. a strip-shaped tooth slot; 13. opening a lock hole; 14. limiting sliding grooves; 15. a limit sliding block; 16. a fixing bolt; 17. inserting blocks; 18. a slot; 19. a jack; 20. a limiting pin; 21. a stop pin; 22. a baffle; 23. a limit sleeve; 24. a spring; 25. an end cap; 26. a pressing plate; 27. a bump; 28. avoiding the groove.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-6.

The embodiment of the application discloses a general flame-proof rifle that charges in civil and mining.

Example 1:

referring to fig. 1 and 2, a civil and mining general explosion-proof charging gun comprises a plug 1 and a socket 2 which are in plug-in fit, and a locking mechanism arranged on the plug 1 and the socket 2, wherein the plug 1 is connected with a charging pile, and the socket 2 is arranged on a carrier. A plurality of insulating pipes 3 are fixedly installed in the socket 2 in a split inserting mode, when the plug 1 is inserted into the socket 2, the insulating pipes 3 are inserted into the plug 1, and as the insulating pipes 3 and the socket 2 are manufactured and installed in a split assembling mode, when the insulating pipes 3 are inserted into the plug 1, gaps between the outer walls of the insulating pipes 3 and the inner walls of the plug 1 meet mining standard gaps. The locking mechanism comprises a first locking part 4, a second locking part 5 and a third locking part 6, and the three locking parts lock the plug 1 and the socket 2, so that when the plug 1 is inserted into the socket 2, stable locking is formed between the plug 1 and the socket 2.

Referring to fig. 2 and 3, a T-shaped guide block 7 is fixedly installed at one side of the top of the plug 1, which is close to the socket 2, by two fixing bolts 16, and a first locking part 4 is installed at the top of the socket 2. The first locking part 4 comprises a locking shell 41 and a first bolt 42, the locking shell 41 is fixedly arranged at the top of the socket 2 through bolts and is covered on the guide block 7, the first bolt 42 is slidably arranged in the locking shell 41 along the vertical direction, the top wall of the guide block 7 is provided with a locking groove 8, and the bottom end of the first bolt 42 is slidably inserted in the locking groove 8. When the plug 1 is inserted into the socket 2, the plug 1 drives the guide block 7 to be slidably inserted into the lock housing 41.

The plug 1 is close to and has offered spacing spout 14 on the lateral wall of guide block 7, is formed with spacing slider 15 on the lateral wall that guide block 7 is close to spacing spout 14, and spacing slider 15 looks slidable mounting is in spacing spout 14 along the horizontal direction, and spacing slider 15 cooperates with spacing spout 14 for guide block 7 installs more stably on plug 1.

The pull ring is installed on the top of guide block 7, and the diameter of guide block 7 bottom is greater than the diameter on top, and the cover is equipped with spring 24 on the guide block 7, and spring 24's one end and the inner chamber roof butt of locking shell 41, the bottom butt of the great diameter of the other end and first bolt 42. When the guide block 7 is inserted into the locking housing 41, the first latch 42 is pulled up by the pull ring, the first latch 42 moves up and presses the spring 24 to contract, and when the guide block 7 is fully inserted into the socket 2, the pull ring is released, and the spring 24 releases elastic potential energy and pushes the first latch 42 into the locking groove 8 of the guide block 7. The mechanical locking is formed in this way, the guide block 7 can be limited, and then the plug 1 is limited, so that the mechanical locking between the plug 1 and the socket 2 is realized.

Referring to fig. 2 and 5, a rotation shaft 10 is rotatably installed in a horizontal direction through a bearing in a locking housing 41, a protrusion 27 is embedded on the rotation shaft 10, a driving tooth 11 is installed on the rotation shaft 10, and the driving tooth 11 is matched with the protrusion 27 on the rotation shaft 10. The top wall of the guide block 7 is provided with a bar-shaped tooth slot 12 along the sliding direction of the second bolt 52, and the gear teeth of the driving gear 11 are meshed with the bar-shaped tooth slot 12. In this application, the rotary shaft 10 may be a socket head cap screw, and an end of the rotary shaft 10 is located outside the locking housing 41. When the plug 1 drives the guide block 7 to enter the locking shell 41, the rotating shaft 10 is rotated, the rotating shaft 10 drives the driving teeth 11 to rotate through the convex blocks 27, and the driving teeth 11 drive the guide block 7 to move through the strip-shaped tooth grooves 12 meshed with the driving teeth 11, so that the plug 1 is convenient to insert into the socket 2.

Referring to fig. 2, the top opening of the plug 1 is provided, the second locking portion 5 is installed in the open end of the plug 1, the end cover 25 is detachably and fixedly installed at the open end of the plug 1 by bolts, and the pressing plate 26 is placed under the end cover 25. When the end cover 25 is installed, the end cover 25 presses down the second locking portion 5 through the pressing plate 26, so that the second locking portion 5 is installed in the plug 1 more stably.

Referring to fig. 4 and 5, the second locking portion 5 includes a driving member 51 fixedly installed in the open end of the plug 1, and a second latch 52 slidably installed in the plug 1 in a direction perpendicular to the first latch 42, the second latch 52 being installed at the driving end of the driving member 51, and an end of the second latch 52 remote from the driving member 51 being slidably inserted into the locking housing 41. The outer side wall of the bottom end of the first bolt 42 is provided with a locking chute, and the end part of the second bolt 52 close to the first bolt 42 is slidably inserted into the locking ring groove 9.

The driving member 51 includes an electromagnetic coil 511 and an electromagnet 512, the electromagnet 512 is in a rod shape, the electromagnetic coil 511 is wrapped on the electromagnet 512, and an end portion of the electromagnet 512 is connected with the second bolt 52. After the mechanical locking of the charging gun is completed, the electromagnetic coil 511 is connected with currents in different directions, and the telescopic state of the electromagnet 512 is switched, that is, the telescopic state of the electromagnet 512 is switched by controlling the current flow direction, so that the second bolt 52 is driven to slide reciprocally. When the second bolt 52 is inserted into the locking ring groove 9, the first bolt 42 can be limited, so that an electric lock is formed, and the charging gun is locked secondarily, so that the plug 1 and the socket 2 are locked more firmly.

Referring to fig. 4, a micro switch is fixedly installed in the opening end of the plug 1, the micro switch is located at one side of the electromagnet 512 away from the second bolt 52 and is abutted against the electromagnet 512, when the driving piece 51 is electrified to perform electric locking, the charging gun is locked after receiving a locking signal of the micro switch, and the charging device can be electrified.

Referring to fig. 2 and 5, an unlocking hole 13 is opened on a sidewall of the locking housing 41, and the unlocking hole 13 communicates with the locking ring groove 9 of the first latch 42. When the driving member 51 of the second locking portion 5 fails, the rod-shaped member is inserted into the locking housing 41 from the unlocking hole 13, and the rod-shaped member is inserted into the locking ring groove 9, so that the second bolt 52 can be pushed to slide out of the locking ring groove 9, and the plug 1 and the socket 2 can still be unlocked when the driving member 51 fails.

Referring to fig. 1 and 4, the third locking portion 6 includes a locking bolt 61, the locking bolt 61 is slidably mounted at the bottom end of the plug 1, and the end of the locking bolt 61 is screw-mounted at the bottom end of the socket 2. After the plug 1 and the socket 2 are locked in the second stage, the locking bolt 61 is used for locking the plug 1 and the socket 2 in the third stage, so that the upper end and the lower end of the plug 1 and the socket 2 are locked, and the locking firmness between the plug 1 and the socket 2 is further improved.

Referring to fig. 1 and 2, the plug 1 and the socket 2 are locked in three stages by using the first locking part 4, the second locking part 5 and the third locking part 6, so that stable locking is formed between the plug 1 and the socket 2, and meanwhile, the gap between the outer wall of the insulating tube 3 and the inner wall of the plug 1 can meet the standard gap for mines, so that the requirement of the explosion-proof charging gun for mines is met. The guide block 7 on the plug 1 is detached and taken down, so that the charging gun is applicable to civilian use. Therefore, the charging gun can be suitable for civil charging and mining explosion-proof charging, and the applicability of the charging gun is improved.

Example 2:

referring to fig. 6, the difference between this embodiment and embodiment 1 is that the side wall of the guide block 7, which is close to the plug 1, is integrally formed with a rectangular insert block 17, the side wall of the plug 1, which is close to the guide block 7, is provided with a rectangular slot 18, and the insert block 17 is adapted to be slidingly inserted into the slot 18. The plug 1 is internally provided with a jack 19 communicated with the bolt, meanwhile, the jack 19 is also arranged in the plug block 17, and a rod-shaped limiting pin 20 is slidably arranged in the jack 19. When the insertion hole 19 is inserted into the insertion groove 18, the limiting pin 20 is inserted into the insertion hole 19, so that the insertion hole 19 is fixed, and the guide block 7 is further fixed; when the guide block 7 needs to be disassembled, the guide block 7 can be disassembled and taken down by sliding and pulling out the limiting pin 20, so that the guide block 7 is more convenient and quick to disassemble and assemble.

The stop pin 21 is rotatably mounted at one end of the stop pin 20, the middle part of the stop pin 21 is rotatably connected with the stop pin 20, and an avoidance groove 28 for the stop pin 21 to rotate is formed in the end part of the stop pin 20. When the limiting pin 20 is required to be inserted, the limiting pin 21 is rotated into the avoidance groove 28, so that the limiting pin 21 and the limiting pin 20 are located on the same axis, the limiting pin 20 drives the limiting pin 21 to penetrate through the plug 1, the limiting pin 21 is rotated again, the limiting pin 21 is perpendicular to the limiting pin 20, and finally the limiting pin 20 is pulled reversely, so that the limiting pin 21 abuts against the outer side wall of the plug 1.

The other end integrated into one piece of spacer 20 has circular baffle 22, and the diameter of circular baffle 22 is greater than the diameter of spacer 20, and the cover is equipped with stop collar 23 to the one end detachable cover that the spacer 20 is close to circular baffle 22, and in this application, stop collar 23 optional rubber sleeve, and stop collar 23's cross-section is the C type. When the stop pin 21 is abutted against the outer side wall of the plug 1, the stop sleeve 23 is sleeved on the stop sleeve 23, one end of the stop sleeve 23 is abutted against the baffle 22, and the other end is abutted against the outer side wall of the plug 1, so that the stop pin 20 is limited and fixed by being matched with the stop pin 21, and the situation that the stop pin 20 is not easy to slip when the charging gun is used is caused.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (9)

1. The utility model provides a general flame proof rifle that charges in civil ore deposit, includes plug (1) and socket (2), its characterized in that: an insulating tube (3) is arranged in the socket (2) in an inserted manner, and a mining standard gap is met between the outer wall of the insulating tube (3) and the inner wall of the plug (1); still include locking mechanical system, locking mechanical system includes first locking part (4), second locking part (5) and third locking part (6), can dismantle on plug (1) and be provided with guide block (7), guide block (7) slip grafting is in socket (2), first locking part (4) set up on socket (2) and lock guide block (7), second locking part (5) set up on plug (1) and lock first locking part (4), third locking part (6) set up on plug (1) and lock socket (2).

2. The civil and mining general flameproof charging gun according to claim 1, wherein: the first locking part (4) comprises a locking shell (41) and a first bolt (42), the locking shell (41) is arranged on the socket (2), the first bolt (42) is arranged on the locking shell (41) in a sliding mode, a locking groove (8) is formed in the side wall, close to the first bolt (42), of the guide block (7), and the first bolt (42) is arranged in the locking groove (8) in a sliding inserting mode.

3. The civil and mining general flameproof charging gun according to claim 2, characterized in that: the second locking part (5) comprises a driving piece (51) and a second bolt (52), the driving piece (51) is arranged in the plug (1), the second bolt (52) is arranged in the plug (1) in a sliding mode along the direction perpendicular to the sliding direction of the first bolt (42) and is in transmission connection with the driving piece (51), a locking ring groove (9) is formed in the outer side wall of the first bolt (42), and the second bolt (52) is arranged in the locking ring groove (9) in a sliding inserting mode.

4. The civil and mining general flameproof charging gun according to claim 1, wherein: the third locking part (6) comprises a locking bolt (61), the locking bolt (61) is arranged in the plug (1) in a sliding mode, and the locking bolt (61) is fixed in the socket (2) in a threaded mode.

5. The civil and mining general flameproof charging gun according to claim 2, characterized in that: the locking shell (41) is rotationally provided with a rotating shaft (10), driving teeth (11) are arranged on the rotating shaft (10), strip-shaped tooth grooves (12) are formed in the side wall, close to the driving teeth (11), of the guide block (7), and the gear teeth of the driving teeth (11) are meshed with the strip-shaped tooth grooves (12).

6. A civil and mining general purpose flameproof charging gun according to claim 3, characterized in that: an unlocking hole (13) is formed in the locking shell (41), and the unlocking hole (13) is communicated with the locking ring groove (9).

7. The civil and mining general flameproof charging gun according to claim 1, wherein: the plug is characterized in that a limiting sliding groove (14) is formed in the plug (1), a limiting sliding block (15) is arranged on the guide block (7), the limiting sliding block (15) is arranged in the limiting sliding groove (14) in a sliding fit manner, a fixing bolt (16) is arranged on the guide block (7), and the fixing bolt (16) penetrates through the guide block (7) and is fixed in the plug (1) through the bolt.

8. The civil and mining general flameproof charging gun according to claim 1, wherein: the plug is characterized in that an inserting block (17) is arranged on the guide block (7), a slot (18) is formed in the plug (1), the inserting block (17) is in adaptive sliding insertion connection with the slot (18), a jack (19) communicated with the slot (18) is formed in the plug (1) along the direction perpendicular to the slot (18), a limiting pin (20) is arranged in the jack (19) in a sliding manner, and the limiting pin (20) penetrates through the inserting block (17).

9. The civil and mining general flameproof charging gun according to claim 8, wherein: the utility model discloses a stop pin, including stop pin (21), stop pin (20), stop pin (21) and stop pin (20) rotate to be connected, just stop pin (21) butt plug (1) lateral wall, stop pin (20) keep away from the tip of stop pin (21) and are formed with baffle (22), stop pin (20) are kept away from stop pin (21) one end and can be dismantled the cover and be equipped with stop collar (23), just the both ends of stop collar (23) respectively with baffle (22) and plug (1) lateral wall butt.