CN110815536B

CN110815536B - Automatic processing device for insulator

Info

Publication number: CN110815536B
Application number: CN201911160840.3A
Authority: CN
Inventors: 崔亮
Original assignee: Shandong Laiwu Porcelain Insulators Co ltd
Current assignee: SHANDONG LAIWU PORCELAIN INSULATORS Co.,Ltd.
Priority date: 2019-11-23
Filing date: 2019-11-23
Publication date: 2021-07-09
Anticipated expiration: 2039-11-23
Also published as: CN110815536A

Abstract

The invention discloses an automatic insulator processing device, and relates to the field of insulator processing equipment. Including processing platform, transport mechanism, transmission mounting, moulding device, drying device and grinding device, transport mechanism sets up at the processing bench, the transmission mounting is equipped with four, four the transmission mounting evenly sets up on transport mechanism, the middle part of processing platform is equipped with the installation piece, moulding device, drying device and grinding device set gradually on the installation piece, the top of installation piece still is equipped with the install bin, be equipped with down the air cylinder in the install bin, the transmission connection pushes down the fixed plate on pushing down the air cylinder, be equipped with three rotatory servo motor on the fixed plate of pushing down, it is three directly over rotatory servo motor's the moulding device in position, drying device and grinding device, it is three rotatory servo motor is connected with a lower gland respectively the transmission. The invention can improve the production efficiency of the insulator and reduce the labor cost.

Description

Automatic processing device for insulator

Technical Field

The invention relates to the field of insulator processing equipment, in particular to an automatic processing device for insulators.

Background

The insulator is a special insulating control part and can play an important role in an overhead transmission line, the insulator is mostly used for a telegraph pole in the early years, one end of a high-voltage wire connecting tower which is slowly developed is hung with a plurality of disc-shaped insulators, the insulators are made of glass or ceramics in order to increase creepage distance, the insulators are called insulators, the insulators cannot fail due to various electromechanical stresses caused by changes of environment and electric load conditions, otherwise, the insulators cannot play a great role, and the use and the service life of the whole line can be damaged.

The porcelain insulator is an insulator made of electrical ceramics, the electrical ceramics are formed by baking quartz, feldspar and clay serving as raw materials, the surface of a porcelain insulator is usually covered by porcelain glaze so as to improve the mechanical strength, prevent water infiltration and increase the surface smoothness, the porcelain insulator is most commonly used in various insulators, the porcelain insulator in the prior art is usually produced manually, and the insulator is manually molded, dried, polished and the like.

Disclosure of Invention

The invention aims to provide an automatic processing device of an insulator, which aims to solve the technical problems that a large amount of manpower is required to be consumed and the production efficiency is low in the production process of the insulator in the prior art.

The utility model provides an automatic processing device of insulator, includes processing platform, transport mechanism, transmission mounting, moulding device, drying device and grinding device, transport mechanism sets up at the processing bench, the transmission mounting is equipped with four, four the transmission mounting evenly sets up on transport mechanism, the middle part of processing platform is equipped with the installation piece, moulding device, drying device and grinding device set gradually on the installation piece, the top of installation piece still is equipped with the install bin, be equipped with down the air cylinder in the install bin, the transmission connection pushes down the fixed plate on pushing down the air cylinder, be equipped with three rotatory servo motor on the fixed plate of pushing down, it is three rotatory servo motor is located moulding device, drying device and grinding device directly over, it is three rotatory servo motor transmission is connected with a lower gland respectively.

Further, transport mechanism comprises conveying board, conveying motor and leading wheel, the conveying board is ring shape setting, four the transmission mounting is installed on the conveying board, the inside wall of conveying board is equipped with the round tooth's socket, conveying motor is equipped with four, four conveying motor is the annular and fixes processing bench, four gear on the conveying motor and the tooth's socket intermeshing on the conveying board, the leading wheel is equipped with four, four the leading wheel is the annular setting and is in the bottom of conveying board, be equipped with the round guide way in the up end of processing bench, four the leading wheel is located the guide way.

Further, the transmission fixing part consists of a plane bearing and a plug board, and the plane bearing is arranged between the plug board and the conveying mechanism.

Further, moulding device comprises moulding connecting plate, moulding mould and moulding motor, moulding mould with moulding connecting plate fixed connection, moulding motor sets up in the install bin, moulding motor with moulding connecting plate conveying is connected.

Further, drying device comprises first drying module, second drying module and stoving telescopic cylinder, first drying module is the same with second drying module's structure, be equipped with the half slot in the first drying module, be equipped with the heating piece in the half slot, telescopic cylinder is equipped with two sets ofly, first drying module is connected to the installation piece through a set of telescopic cylinder, the vertical mounting panel that sets up on the processing bench, second drying module is connected to the mounting panel through a set of telescopic cylinder, two half slots in first drying module and the second drying module correspond each other.

Further, grinding device comprises the piece of polishing, the fixed plate of polishing and grinding motor, polish the piece with fixed plate fixed connection polishes, grinding motor installs in the install bin, grinding motor with the fixed plate transmission of polishing is connected.

Furthermore, a guide piece is arranged in the installation box, a guide sleeve is arranged on the downward pressing fixing plate, and the position of the guide sleeve corresponds to that of the guide piece.

Further, the install bin is the chamber that holds of D style of calligraphy.

Compared with the prior art, the invention has the beneficial effects that: firstly, the invention is provided with a shaping device, a drying device and a polishing device, only one worker is needed to place the pug on a transmission fixing piece in the working process, the pug is sequentially conveyed to the shaping device, the drying device and the polishing device through a conveying mechanism, the pug is processed into a designated shape through the shaping mechanism, the molded pug is pre-dried through the drying device, the moisture in the pug is reduced, the pug cannot be easily deformed, finally, the pug is polished through the polishing device to treat rough edges on the pug, the surface of the pug is smoother, when the pug is processed, the pug is conveyed back through the conveying device, the worker collects and places the processed pug and places the unprocessed pug in the transmission fixing piece again, the invention can simultaneously process three pugs, and improves the working efficiency of the equipment, when the device is operated, only one worker is needed to perform feeding and discharging, so that the labor cost is reduced, and the technical problems that a large amount of labor is consumed and the production efficiency is low in the production process of the insulator in the prior art are effectively solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a first angular configuration of the present invention;

FIG. 2 is a second angular configuration of the present invention;

FIG. 3 is a schematic view of the internal structure of the mounting box of the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic sectional view of the transfer mechanism of the present invention;

FIG. 6 is a schematic sectional view of the transmission fixing member of the present invention;

FIG. 7 is a side view of the present invention;

FIG. 8 is a schematic view of the shaping device of the present invention;

FIG. 9 is a schematic view of the polishing device according to the present invention;

FIG. 10 is a top view of the present invention;

reference numerals: the device comprises a processing table 1, a mounting block 11, a mounting box 12, a pressing cylinder 13, a pressing fixing plate 14, a rotary servo motor 15, a pressing cover 16, a guide member 17, a guide sleeve 18, a conveying mechanism 2, a conveying plate 21, a conveying motor 22, a guide wheel 23, a guide groove 24, a transmission fixing member 3, a plane bearing 31, an insertion plate 32, a shaping device 4, a shaping connecting plate 41, a shaping die 42, a shaping motor 43, a drying device 5, a first drying module 51, a second drying module 52, a drying telescopic cylinder 53, a heating block 54, a mounting plate 55, a grinding device 6, a grinding member 61, a grinding fixing plate 62 and a grinding motor 63.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to fig. 1 to 10, and it is obvious that the described embodiments are some, not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 10, an automatic processing device for insulators comprises a processing table 1, a conveying mechanism 2, four transmission fixing pieces 3, a shaping device 4, a drying device 5 and a polishing device 6, wherein the conveying mechanism 2 is arranged on the processing table 1, the four transmission fixing pieces 3 are arranged on the conveying mechanism 2, the transmission fixing pieces 3 are evenly arranged on the conveying mechanism 2, when the automatic processing device is used, pug is fixed through the transmission fixing pieces 3, an installation block 11 is arranged in the middle of the processing table 1, the shaping device 4, the drying device 5 and the polishing device 6 are sequentially arranged on the installation block 11, the conveying mechanism 2 drives the pug to sequentially pass through the shaping device 4, the drying device 5 and the polishing device 6, the pug is shaped through the shaping device 4, the pug is pre-dried through the drying device 5, moisture in the pug is reduced, and the pug after shaping is not easy to deform, The woollen after drying is polished through grinding device 6, makes the mud material whole more mellow and smooth, the top of installation piece 11 still is equipped with install bin 12, be equipped with down air cylinder 13 in the install bin 12, the transmission connection pushes down fixed plate 14 on pushing down air cylinder 13, it is equipped with three rotatory servo motor 15, three to push down on the fixed plate 14 rotatory servo motor 15 is located moulding device 4, drying device 5 and grinding device 6 directly over, three rotatory servo motor 15 transmission respectively is connected with one gland 16 down.

When the invention is operated, firstly, a first pug is manually arranged on a transmission fixing piece 3, the first pug is conveyed to a shaping device 4 through a conveying mechanism 2, a pressing-down fixing plate 14 is driven to press down through a pressing-down cylinder 13, three rotary servo motors 15 fixed on the pressing-down fixing plate 14 synchronously press down, a pressing-down cover 16 is in close contact with the first pug, meanwhile, a second pug is manually arranged on the transmission fixing piece 3 conveyed through the conveying mechanism 2, the first pug is driven to rotate through the rotary servo motors 15, the shaping device 4 shapes the first pug, after the shaping is completed, the pressing-down cylinder 13 extends upwards, the pressing-down cover 16 and the pug are separated from each other, the first pug is conveyed to a drying device 5 through the conveying mechanism 2, the second pug is conveyed to the shaping device 4, the pressing-down cylinder 13 presses down, two lower pressing covers 16 are respectively in close contact with a first pug and a second pug, the first pug and the second pug are driven to rotate by two rotary servo motors 15, the first pug is dried by a drying device 5, the second pug is shaped by a shaping device 4, a third pug is manually placed on a transmission fixing part 3 transmitted by a transmission mechanism 2, a lower pressing cylinder 13 drives a lower pressing fixing plate 14 to rise, the two lower pressing covers 16 are simultaneously separated from the first pug and the second pug, the transmission mechanism 2 transmits the first pug to a polishing device 6, transmits the second pug to the drying device 5 and transmits the third pug to the shaping device 4, and the lower pressing cylinder 13 drives the lower pressing fixing plate 14 to descend so that the three lower pressing covers 16 are respectively in close contact with the first pug, the second pug and the third pug, the first pug, the second pug and the third pug are respectively driven to rotate by three rotary servo motors 15, the first pug is polished by a polishing device 6, the second pug is dried by a drying device 5, the third pug is shaped by a shaping device 4, meanwhile, the fourth pug is manually placed on a transmission fixing piece 3 which is transmitted by a transmission mechanism 2, the first pug is transmitted to a manual position by the transmission mechanism 2 again, the second pug is transmitted to the polishing device 6, the third pug is transmitted to the drying device 5, the second pug, the third pug and the fourth pug are respectively processed by the polishing device 6, the drying device 5 and the shaping device 4, meanwhile, the first pug which is processed is manually taken down from the transmission fixing piece 3 and the unprocessed pug is placed on the transmission fixing piece 3, by analogy, the insulator mud shaping, drying and polishing process can be quickly carried out by only one worker during operation, so that the production efficiency of the insulator is greatly improved, and the labor cost is reduced.

The conveying mechanism 2 is composed of a conveying plate 21, conveying motors 22 and guide wheels 23, the conveying plate 21 is arranged in a circular ring shape, four transmission fixing pieces 3 are installed on the conveying plate 21, the inner side wall of the conveying plate 21 is provided with a circle of tooth grooves, the number of the conveying motors 22 is four, the four conveying motors 22 are annularly fixed on the processing table 1, gears on the four conveying motors 22 are meshed with the tooth grooves on the conveying plate 21, the four conveying motors 22 drive the conveying plate 21 to rotate, the four transmission fixing pieces 3 arranged on the conveying plate 21 rotate by taking the axis of the conveying plate 21 as the center of a circle, the number of the guide wheels 23 is four, the four guide wheels 23 are annularly arranged at the bottom end of the conveying plate 21, a circle of guide grooves 24 are arranged in the upper end face of the processing table 1, and the four guide wheels 23 are positioned in the guide grooves 24, the four guide wheels 23 on the conveying plate 21 are matched with the guide grooves 24, so that the position of the conveying plate 21 cannot deviate in the rotation process, and meanwhile, the four guide wheels 23 provide enough supporting force for the conveying plate 21, so that the conveying plate 21 can support the weight of four pugs at the same time.

Transmission mounting 3 comprises flat bearing 31 and cartridge board 32, flat bearing 31 sets up between cartridge board 32 and transport mechanism 2, during the use the mud material is installed on cartridge board 32, supports fixedly through cartridge board 32 to the mud material, sets up flat bearing 31 between cartridge board 32 and transport mechanism 2 and can make cartridge board 32 and mud material rotatory on flat bearing 31, and the rotary servo motor 15 of being convenient for drives the mud material and rotates.

The shaping device 4 is composed of a shaping connecting plate 41, a shaping mold 42 and a shaping motor 43, the shaping mold 42 is fixedly connected with the shaping connecting plate 41, the shaping motor 43 is arranged in the installation box 12, the shaping motor 43 is in transmission connection with the shaping connecting plate 41, when the conveying mechanism 2 conveys the pug, the shaping motor 43 drives the shaping connecting plate 41 to tighten up at the side end of the installation block 11, when the pressing cover 16 is in close contact with the pug and the pug is driven by the rotary servo motor 15 to rotate, the shaping motor 43 drives the shaping connecting plate 41 to rotate slowly, so that the shaping mold is gradually close to the rotating pug, and meanwhile, the redundant part of the pug is removed in the rotating process of the pug, and thus, the shaping is completed.

The drying device 5 comprises a first drying module 51, a second drying module 52 and drying telescopic cylinders 53, the first drying module 51 and the second drying module 52 have the same structure, a semicircular groove is arranged on the first drying module 51, a heating block 54 is arranged in the semicircular groove, two groups of drying telescopic cylinders 53 are arranged, the first drying module 51 is connected to the mounting block 11 through a group of drying telescopic cylinders 53, a mounting plate 55 is vertically arranged on the processing table 1, the second drying module 52 is connected to the mounting plate 55 through a group of drying telescopic cylinders 53, the two semicircular grooves in the first drying module 51 and the second drying module 52 correspond to each other, and when the conveying mechanism 2 conveys the pug, push rods of the two groups of drying telescopic cylinders 53 are in a retraction state, so that the first drying module 51 and the second drying module 52 are in a separation state, the effect of the drying device is that the conveying mechanism 2 is convenient to convey pug between the first drying module 51 and the second drying module 52, when the pug is between the first drying module 51 and the second drying module 52, the lower pressing cylinder 13 drives the lower pressing cover 16 to fix the pug, the two groups of drying telescopic cylinders 53 simultaneously push out the first drying module 51 and the second drying module 52, so that the semicircular grooves on the first drying module 51 and the second drying module 52 form a complete circular groove, the pug is in the circular groove, the pug in the circular groove is heated and dried by the arranged heating block 54, moisture in the pug is removed, the pug is not easy to deform in the subsequent processing process, and drying is completed.

The polishing device 6 comprises a polishing piece 61, a polishing fixing plate 62 and a polishing motor 63, wherein the polishing piece 61 is fixedly connected with the polishing fixing plate 62, the polishing motor 63 is installed in the installation box 12, the polishing motor 63 is in transmission connection with the polishing fixing plate 62, when the conveying mechanism 2 conveys the pugs, the polishing motor 63 drives the polishing fixing plate 62 to be tightened at the side end of the installation block 11, when the lower pressing cover 16 is in close contact with the pugs and drives the pugs to rotate through the rotary servo motor 15, the polishing motor 63 drives the polishing fixing plate 62 to move towards the pugs and pushes the polishing piece 61 to the pugs, and the polishing piece 61 polishes and removes redundant burrs in the pugs through rotation of the pugs, so that polishing is completed.

The installation box 12 is internally provided with a guide member 17, the downward pressing fixing plate 14 is provided with a guide sleeve 18, the position of the guide sleeve 18 corresponds to the guide member 17, when the downward pressing fixing plate 14 moves up and down, the guide sleeve 18 vertically moves in the guide member 17, and the installation box has the effects that the downward pressing fixing plate 14 is in a vertical state in the moving process through the mutual matching of the guide sleeve 18 and the guide member 17, and the moving direction of the downward pressing fixing plate 14 is prevented from being deviated to damage the rotary servo motor 15 arranged on the downward pressing fixing plate 14 after being pressed.

Install bin 12 is the chamber that holds of D style of calligraphy, the plane direction department of install bin 12 is artifical material loading department, sets up install bin 12 into the D style of calligraphy and can increase the working space of artifical material loading department, and the staff of being convenient for installs or takes off the mud material on transmission mounting 3.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an automatic processing device of insulator, includes processing platform (1), transport mechanism (2), transmission mounting (3), moulding device (4), drying device (5) and grinding device (6), transport mechanism (2) set up on processing platform (1), transmission mounting (3) are equipped with four, four transmission mounting (3) evenly set up on transport mechanism (2), the middle part of processing platform (1) is equipped with installation piece (11), moulding device (4), drying device (5) and grinding device (6) set gradually on installation piece (11):

the method is characterized in that:

an installation box (12) is further arranged above the installation block (11), a pressing cylinder (13) is arranged in the installation box (12), a pressing fixing plate (14) is connected to the pressing cylinder (13) in a transmission mode, three rotary servo motors (15) are arranged on the pressing fixing plate (14), the three rotary servo motors (15) are located right above the shaping device (4), the drying device (5) and the polishing device (6), and the three rotary servo motors (15) are respectively connected with a lower pressing cover (16) in a transmission mode;

the transmission fixing piece (3) consists of a plane bearing (31) and an insertion plate (32), and the plane bearing (31) is arranged between the insertion plate (32) and the transmission mechanism (2);

the conveying mechanism (2) is composed of a conveying plate (21), conveying motors (22) and guide wheels (23), the conveying plate (21) is arranged in a circular ring shape, four transmission fixing pieces (3) are installed on the conveying plate (21), the inner side wall of the conveying plate (21) is provided with a circle of tooth grooves, the number of the conveying motors (22) is four, the four conveying motors (22) are annularly fixed on the machining table (1), gears on the four conveying motors (22) are meshed with the tooth grooves on the conveying plate (21), the number of the guide wheels (23) is four, the four guide wheels (23) are annularly arranged at the bottom end of the conveying plate (21), a circle of guide grooves (24) are formed in the upper end face of the machining table (1), and the four guide wheels (23) are located in the guide grooves (24);

the shaping device (4) is composed of a shaping connecting plate (41), a shaping die (42) and a shaping motor (43), the shaping die (42) is fixedly connected with the shaping connecting plate (41), the shaping motor (43) is arranged in the installation box (12), and the shaping motor (43) is in transmission connection with the shaping connecting plate (41);

the drying device (5) comprises a first drying module (51), a second drying module (52) and drying telescopic cylinders (53), the first drying module (51) and the second drying module (52) are identical in structure, semicircular grooves are formed in the first drying module (51), heating blocks (54) are arranged in the semicircular grooves, two groups of telescopic cylinders are arranged, the first drying module (51) is connected to the mounting block (11) through one group of telescopic cylinders, a mounting plate (55) is vertically arranged on the processing table (1), the second drying module (52) is connected to the mounting plate (55) through one group of telescopic cylinders, and two semicircular grooves in the first drying module (51) and the second drying module (52) correspond to each other;

the polishing device (6) is composed of a polishing piece (61), a polishing fixing plate (62) and a polishing motor (63), the polishing piece (61) is fixedly connected with the polishing fixing plate (62), the polishing motor (63) is installed in the installation box (12), and the polishing motor (63) is in transmission connection with the polishing fixing plate (62);

during operation, a first pug is manually installed on an inserting plate (32) of a transmission fixing part (3), the first pug is conveyed to a shaping device (4) through a conveying mechanism (2), a pressing cylinder (13) drives a pressing fixing plate (14) to press downwards, three rotary servo motors (15) fixed on the pressing fixing plate (14) are synchronously pressed downwards, a pressing cover (16) is in close contact with the first pug, a second pug is manually placed on the transmission fixing part (3) conveyed through the conveying mechanism (2), the first pug is shaped through the shaping device (4) while the rotary servo motors (15) drive the first pug to rotate, the pressing cylinder (13) stretches upwards after shaping is completed, the pressing cover (16) is separated from the first pug, and the first pug is conveyed to a drying device (5) through the conveying mechanism (2), The second pug is conveyed to a shaping device (4), a pushing cylinder (13) is pushed down, two pushing covers (16) are respectively in close contact with the first pug and the second pug, the first pug and the second pug are driven to rotate through two rotary servo motors (15), the first pug is dried through a drying device (5), the second pug is shaped through the shaping device (4), a third pug is manually placed on a transmission fixing part (3) transmitted through a conveying mechanism (2), the pushing cylinder (13) drives a pushing fixing plate (14) to rise, the two pushing covers (16) are separated from the first pug and the second pug, the conveying mechanism (2) is used for conveying the first pug to the device (6), the second pug to the drying device (5), and the third pug to the drying device (5), A third pug is conveyed to a shaping device (4), a pressing cylinder (13) drives a pressing fixing plate (14) to descend to enable three pressing covers (16) to respectively and closely contact with the first pug, the second pug and the third pug, three rotary servo motors (15) respectively drive the first pug, the second pug and the third pug to rotate, a grinding device (6) grinds the first pug, a drying device (5) dries the second pug, the shaping device (4) shapes the third pug, a fourth pug is manually placed on a transmission fixing piece (3) transmitted by a conveying mechanism (2), the first pug is conveyed by the conveying mechanism (2) again, the second pug is conveyed to the grinding device (6), the third pug is conveyed to the drying device (5), The fourth pug is conveyed to a shaping device (4), the second pug, the third pug and the fourth pug are processed respectively through a grinding device (6), a drying device (5) and the shaping device (4), and meanwhile, the first pug after the processing is finished is taken down from the transmission fixing piece (3) manually and the unprocessed pug is placed on the transmission fixing piece (3).

2. An automatic insulator machining device according to claim 1, characterized in that a guide member (17) is provided in the mounting box (12), a guide sleeve (18) is provided on the hold-down plate (14), and the position of the guide sleeve (18) corresponds to the position of the guide member (17).

3. An automatic insulator machining device according to claim 1, characterized in that the installation box (12) is a D-shaped accommodating cavity.