High gain dual-polarized wideband horn antenna

Abstract

The application discloses a high-gain dual-polarized wideband horn antenna and relates to the technical field of horn antennas for communication. The horn antenna comprises an antenna body, a radiation aperture extension cylinder is fixed at a horn opening of the antenna body, a first conical cavity is formed in an inner cavity of the antenna body, a second conical cavity is formed in an inner cavity of the radiation aperture extension cylinder, a right end opening of the first conical cavity is matched with a left end opening of the second conical cavity, and an opening angle of the first conical cavity is consistent with an opening angle of the second conical cavity. The horn antenna has high radiation efficiency and can realize wideband and high gain in the smallest size.

Description

Technical Field

[0001] This invention relates to the field of horn antenna technology for communication, and more particularly to a high-gain dual-polarized broadband horn antenna. Background Technology

[0002] Horn antennas are widely used in microwave measurement, radar, and detection systems due to their versatility, simplicity, and good radiation performance. Recently, with the development of electromagnetic wave theory and antenna technology, the demand for broadband horn antennas in various electronic systems such as electronic countermeasures and electronic reconnaissance is increasing. The most direct way to broaden the operating bandwidth of horn antennas is to add a ridge structure to the waveguide and the open / slit portion at the top of the horn antenna. This ridged horn antenna has advantages such as high gain, low impedance, small size, and easy connection to transmission lines, making it very suitable for radar, electronic countermeasures equipment, and microwave electronic devices. Existing dual-polarized high-gain horn antennas have low radiation efficiency, resulting in a relatively large required size. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to provide a dual-polarized broadband horn antenna with high radiation efficiency and achieving broadband and high gain in a minimal size.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a high-gain dual-polarized broadband horn antenna, including an antenna body, a radiating aperture extension tube fixed at the horn opening of the antenna body, a first conical cavity formed in the inner cavity of the antenna body, and a second conical cavity formed in the inner cavity of the radiating aperture extension tube, wherein the right end opening of the first conical cavity is adapted to the left end opening of the second conical cavity, and the opening angle of the first conical cavity is consistent with the opening angle of the second conical cavity.

[0005] A further technical solution is as follows: the antenna body includes an upper plate, a lower plate, a front plate, a rear plate, and a cover plate. The cover plate is located at the rear end of the antenna body. The upper plate and the lower plate are located between the front plate and the rear plate. The upper plate, the lower plate, the front plate, and the rear plate enclose a cylindrical structure with a first conical cavity inside and openings at both ends. The left opening of the cylindrical structure is closed by the cover plate. A curved ridge is formed on the upper plate, the lower plate, the front plate, and the rear plate on the inner wall of the cylindrical structure. The angle between the curved ridges is 90°. The left end of the ridge is fixed to the cover plate, and the right end of the curved ridge extends to the middle of the cylindrical structure. A connector is provided on the upper plate and the front plate respectively. A central post is provided on the lower plate and the rear plate corresponding to the connector respectively. The outer end of the central post is located outside the antenna body, and the inner end of the central post is located inside the corresponding connector.

[0006] A further technical solution is that a snap-fit ​​protrusion is formed on the right end face of the cylindrical structure, and the snap-fit ​​protrusion is inserted into the slot on the left end face of the radiating port extension cylinder.

[0007] A further technical solution is that: the cover plate includes a cover plate body, and a right-extending snap-fit ​​protrusion is formed on the right end face of the cover plate body. A snap-fit ​​groove that matches the curved ridge is formed on the upper, lower, front and rear sides of the snap-fit ​​protrusion. The left end of the curved ridge is snapped into the snap-fit ​​groove.

[0008] A further technical solution is as follows: the front plate and the rear plate are symmetrically arranged. The front plate includes a first horizontal portion, and a first inclined portion is connected to the right side of the first horizontal portion. The right end of the first inclined portion is inclined outward. A first central hole is formed in the middle of the first horizontal portion, penetrating its front and rear sides. The first central hole is adapted to the central column. A curved ridge is arranged along the central axis of the front plate, and a snap-fit ​​boss is formed at the left end of the curved ridge. The snap-fit ​​boss is inserted into the corresponding snap-fit ​​groove. The curved ridge extends to the right end of the front plate to the middle of the first inclined portion. A first connecting portion extending upward and a first protrusion extending to the right are formed at the right end of the first inclined portion. Mounting holes are formed on the first horizontal portion, the first inclined portion, and the first connecting portion.

[0009] A further technical solution is as follows: the upper plate and the lower plate are symmetrically arranged. The upper plate includes a second horizontal part, and a second inclined part is connected to the right side of the second horizontal part. The right end of the second inclined part is inclined outward. A second central hole is formed in the middle of the second horizontal part, penetrating its upper and lower sides. The second central hole is adapted to the central column. A curved ridge is arranged along the central axis of the upper plate, and a snap-fit ​​boss is formed at the left end of the curved ridge. The snap-fit ​​boss is inserted into the corresponding snap-fit ​​groove. The curved ridge extends to the right end of the upper plate to the middle of the second inclined part. A second connecting part extending upward and a second protrusion extending to the right are formed at the right end of the second inclined part. Mounting holes are formed on the second horizontal part, the second inclined part, and the second connecting part.

[0010] A further technical solution is as follows: a third center hole, a fifth center hole, and a seventh center hole are respectively formed on the front curved ridge, the rear curved ridge, and the rear plate opposite to the first center hole. The front end of the first center post passes through the seventh center hole on the rear plate, the fifth center hole on the rear curved ridge, and the third center hole on the front curved ridge in sequence before entering the first center hole. The first center post does not contact the inner wall of the first center hole, the third center hole, the fifth center hole, and the seventh center hole. A connector is fixed on the outside of the first center hole.

[0011] A further technical solution is as follows: a fourth center hole, a sixth center hole, and an eighth center hole are respectively formed on the upper curved ridge, the lower curved ridge, and the lower plate opposite to the second center hole. The front end of the second center post passes through the eighth center hole on the lower plate, the sixth center hole on the lower curved ridge, and the fourth center hole on the upper curved ridge in sequence before entering the second center hole. The second center post does not contact the inner walls of the second center hole, the fourth center hole, the sixth center hole, and the eighth center hole. A connector is fixed on the outside of the first center hole.

[0012] The beneficial effects of adopting the above technical solution are as follows: The horn antenna described in this application includes two parts: the antenna body and the radiating aperture extension tube. The angle of the second conical cavity inside the radiating aperture extension tube is consistent with the angle of the first conical cavity inside the antenna body, maintaining the continuity of its inner cavity. The radiating aperture extension tube is used to improve the gain, and the four-ridge structure plays the main role of impedance matching. Moreover, the right end of the curved ridge extends to the middle of the horn antenna. Through the above structure, the radiation efficiency can be effectively improved, that is, impedance matching is completed and the aperture radiation efficiency is improved, achieving broadband and high gain within a minimum size. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a three-dimensional structural diagram of the antenna described in an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the antenna structure described in an embodiment of the present invention;

[0016] Figure 3 This is a cross-sectional view of the antenna described in an embodiment of the present invention;

[0017] Figure 4 yes Figure 3 Enlarged structural diagram at point A;

[0018] Figure 5 This is a schematic diagram of the antenna body in the antenna described in the embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the structure of the cover plate in the antenna body according to an embodiment of the present invention;

[0020] Figure 7 This is a schematic diagram of the front panel structure described in an embodiment of the present invention;

[0021] Figure 8 This is a schematic diagram of the structure of the upper plate described in an embodiment of the present invention;

[0022] Figure 9This is a schematic diagram of the structure of the rear plate described in an embodiment of the present invention;

[0023] Figure 10 This is a schematic diagram of the structure of the lower plate described in an embodiment of the present invention;

[0024] Figure 11 This is an exploded structural diagram of the antenna body described in an embodiment of the present invention;

[0025] Figure 12 This is a schematic diagram of the structure of the radiation port extension cylinder in an embodiment of the present invention;

[0026] Figure 13 This is a schematic diagram of the structure of the central column described in an embodiment of the present invention;

[0027] Wherein: 1. Antenna body; 1-1. First conical cavity; 1-2. Upper plate; 1-2-1. Second horizontal part; 1-2-2. Second inclined part; 1-2-3. Second central hole; 1-2-4. Second connecting part; 1-2-5. Second protrusion;

[0028] 1-3, Lower board;

[0029] 1-4, Front panel; 1-4-1, First horizontal part; 1-4-2, First inclined part; 1-4-3, First center hole; 1-4-4, First connecting part; 1-4-5, First protrusion;

[0030] 1-5, Back panel;

[0031] 1-6, Cover plate; 1-6-1, Cover plate body; 1-6-2, Snap-fit ​​boss; 1-6-3, Snap-fit ​​groove;

[0032] 1-7, Curved ridge; 1-8, Connector; 1-9, Center post; 1-10, Snap-fit ​​protrusion;

[0033] 2. Radial opening extension tube; 2-1. Second conical cavity; 2-2. Slot;

[0034] 3. Locating pin; 4. Installing screw; 5. Installing nut. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0037] like Figures 1-3 As shown in the figure, this invention discloses a high-gain dual-polarized broadband horn antenna, comprising an antenna body 1 and a radiating aperture extension tube 2, the radiating aperture extension tube 2 being fixed at the horn opening of the antenna body 1. The inner cavity of the antenna body 1 forms a first conical cavity 1-1, and the inner cavity of the radiating aperture extension tube 2 forms a second conical cavity 2-1. The right end opening of the first conical cavity 1-1 is adapted to the left end opening of the second conical cavity 2-1, and the angle of the first conical cavity 1-1 is consistent with the angle of the second conical cavity 2-1. The first conical cavity 1-1 and the second conical cavity 2-1 are interconnected, forming an electromagnetic wave propagation channel.

[0038] Furthermore, such as Figure 5 and Figure 11 As shown, the antenna body is made of metal and includes an upper plate 1-2, a lower plate 1-3, a front plate 1-4, a rear plate 1-5, and a cover plate 1-6. The cover plate 1-6 is located at the rear end of the antenna body 1. The upper plate 1-2 and the lower plate 1-3 are located between the front plate 1-4 and the rear plate 1-5. The upper plate 1-2, the lower plate 1-3, the front plate 1-4, and the rear plate 1-5 together form a cylindrical structure with a first conical cavity 1-1 inside and openings at both ends. The left opening of the cylindrical structure is closed by the cover plate 1-6. A curved ridge 1-7 is formed on the upper plate 1-2, lower plate 1-3, front plate 1-4, and rear plate 1-5 of the inner wall of the cylindrical structure, with an included angle of 90° between the curved ridges 1-7. The left end of the curved ridge 1-7 is fixed to the cover plate 1-6, and the right end of the curved ridge 1-7 extends to the middle of the cylindrical structure. A connector 1-8 is respectively provided on the upper plate 1-2 and the front plate 1-4, and a central post 1-9 is respectively provided on the lower plate 1-3 and the rear plate 1-5 corresponding to the connector 1-8. The outer end of the central post 1-9 is located outside the antenna body 1, and the inner end of the central post 1-9 is located inside the corresponding connector 1-8. Further... Figure 3 and Figure 5 As shown, a snap-fit ​​protrusion 1-10 is formed on the right end face of the cylindrical structure. The snap-fit ​​protrusion 1-10 is inserted into the slot 2-2 on the left end face of the radiating port extension tube 2, which facilitates the positioning and connection between the antenna body 1 and the radiating port extension tube 2.

[0039] Furthermore, such as Figure 6 As shown, the cover plate 1-6 includes a cover plate body 1-6-1, which is a cuboid structure. A right-extending snap-fit ​​boss 1-6-2 is formed on the right end face of the cover plate body 1-6-1. A groove is formed in the middle of the snap-fit ​​boss 1-6-2, so that the groove forms a side wall structure at the front, back, top, and bottom. Each side wall structure has a snap-fit ​​groove 1-6-3 that is adapted to the curved ridge 1-7. The left end of the curved ridge 1-7 is snapped into the snap-fit ​​groove 1-6-3. By setting the snap-fit ​​groove 1-6-3 to cooperate with the curved ridge 1-7, it is convenient to fix and position the curved ridge 1-7.

[0040] Furthermore, such as Figure 7 As shown, the front plate 1-4 includes a first horizontal portion 1-4-1, a first inclined portion 1-4-2 connected to the right side of the first horizontal portion 1-4-1, the right end of the first inclined portion 1-4-2 inclined outward, a first central hole 1-4-3 formed in the middle of the first horizontal portion 1-4-1 penetrating its front and rear sides, the first central hole 1-4-3 being adapted to the central post 1-9, and a curved ridge 1-7 arranged along the central axis of the front plate 1-4, and the curved ridge 1-7... A snap-fit ​​boss is formed at the left end of the front plate 1-4, which is inserted into the corresponding snap-fit ​​groove 1-6-3. The curved ridge 1-7 extends towards the right end of the front plate 1-4 to the middle of the first inclined portion 1-4-2. The right end of the first inclined portion 1-4-2 forms an upwardly extending first connecting portion 1-4-4 and a rightward extending first protrusion 1-4-5. Mounting holes are formed on the first horizontal portion 1-4-1, the first inclined portion 1-4-2, and the first connecting portion 1-4-4. The front plate 1-4 and the rear plate 1-5 are symmetrically arranged, and their structures are similar. The specific structure of the rear plate 1-5 is as follows: Figure 9 As shown, it will not be elaborated upon here.

[0041] Furthermore, such as Figure 8As shown, the upper plate 1-2 includes a second horizontal portion 1-2-1, and a second inclined portion 1-2-2 is connected to the right side of the second horizontal portion 1-2-1. The right end of the second inclined portion 1-2-2 is inclined outward. A second central hole 1-2-3 is formed in the middle of the second horizontal portion 1-2-1, penetrating its upper and lower sides. The second central hole 1-2-3 is adapted to the central column 1-9. A curved ridge 1-7 is arranged along the central axis of the upper plate 1-2, and the curved ridge 1-7... A snap-fit ​​boss is formed at the left end of the upper plate 1-2, which is inserted into the corresponding snap-fit ​​groove 1-6-3. The curved ridge 1-7 extends to the right end of the upper plate 1-2 to the middle of the second inclined portion 1-2-2. The right end of the second inclined portion 1-2-2 forms an upwardly extending second connecting portion 1-2-4 and a rightward extending second protrusion 1-2-5. Mounting holes are formed on the second horizontal portion 1-2-1, the second inclined portion 1-2-2, and the second connecting portion 1-2-4. The upper plate 1-2 and the lower plate 1-3 are symmetrically arranged, and their structures are similar. The specific structure of the lower plate 1-3 is as follows: Figure 10 As shown, it will not be elaborated upon here.

[0042] Furthermore, in this embodiment, the curve equations of the ridge curves of curves 1-7 can be: Where y represents the height of the ridge, x represents the length of the ridge, x = 0.86215442~26, and a, b, c are constants. It should be noted that the curve equation can also be other forms of curve equation.

[0043] Furthermore, a third center hole, a fifth center hole, and a seventh center hole are formed on the front curved ridge, the rear curved ridge, and the rear plate, respectively, opposite to the first center hole 1-4-3. The front end of the first center post passes through the seventh center hole on the rear plate, the fifth center hole on the rear curved ridge, and the third center hole on the front curved ridge in sequence before entering the first center hole. The first center post does not contact the inner walls of the first center hole, the third center hole, the fifth center hole, and the seventh center hole. A connector 1-8 is fixed on the outer side of the first center hole.

[0044] The upper curved ridge, lower curved ridge, and lower plate, opposite to the second central hole 1-2-3, respectively form a fourth central hole, a sixth central hole, and an eighth central hole. The front end of the second central post passes sequentially through the eighth central hole on the lower plate, the sixth central hole on the lower curved ridge, and the fourth central hole on the upper curved ridge before entering the second central hole. The second central post does not contact the inner walls of the second, fourth, sixth, and eighth central holes. A connector 1-8 is fixed to the outside of the first central hole. Figure 4As shown, in this application, the first central post and the second central post do not contact each other, and the distance between them is 0.5mm. The structure of the first central post is the same as that of the second central post. The outer end of the central post is connected to the antenna body by a mounting nut 5. Its specific structure is as follows. Figure 13 As shown.

[0045] like Figure 12 The diagram shows the specific structure of the radiating aperture extension tube 2, which is effectively connected to the antenna body through corresponding connecting holes and slots 2-2. The antenna body 1 and the radiating aperture extension tube 2 are fixedly connected by positioning pins and mounting screws. The upper plate 1-2, lower plate 1-3, front plate 1-4 and rear plate 1-5 are fixedly connected by mounting screws. The cover plate 1-6 is fixedly connected to the upper plate 1-2, lower plate 1-3, front plate 1-4 and rear plate 1-5 by positioning pins and mounting screws.

[0046] In this application, the angle of the second conical cavity inside the radiating aperture extension tube is consistent with the angle of the first conical cavity inside the antenna body, maintaining the continuity of its internal cavity. The radiating aperture extension tube is used to improve the gain, and the four-ridge structure plays the main role of impedance matching. The right end of the curved ridge extends to the middle of the horn antenna. Through the above structure, the radiation efficiency can be effectively improved, that is, impedance matching is completed and the aperture radiation efficiency is improved, achieving broadband and high gain in a minimal size.

Claims

1. A high-gain dual-polarized broadband horn antenna, characterized in that: The antenna body (1) includes a radiating aperture extension tube (2) fixed at the horn opening of the antenna body (1). The inner cavity of the antenna body (1) forms a first conical cavity (1-1), and the inner cavity of the radiating aperture extension tube (2) forms a second conical cavity (2-1). The right end opening of the first conical cavity (1-1) is adapted to the left end opening of the second conical cavity (2-1), and the angle of the first conical cavity (1-1) is consistent with the angle of the second conical cavity (2-1). The antenna body includes an upper plate (1-2), a lower plate (1-3), a front plate (1-4), a rear plate (1-5), and a cover plate (1-6). The cover plate (1-6) is located at the rear end of the antenna body (1). The upper plate (1-2) and the lower plate (1-3) are located between the front plate (1-4) and the rear plate (1-5). The upper plate (1-2), the lower plate (1-3), the front plate (1-4), and the rear plate (1-5) together form a cylindrical structure with a first conical cavity (1-1) inside and openings at both ends. The left opening of the cylindrical structure is closed by the cover plate (1-6). The upper plate (1-2), the lower plate (1-3), the front plate (1-5), and the rear plate (1-6) of the inner wall of the cylindrical structure are connected by the cover plate (1-6). 4) A curved ridge (1-7) is formed on both the front and rear plates (1-5), and the included angle between adjacent curved ridges (1-7) is 90°; the left end of the curved ridge (1-7) is fixed to the cover plate (1-6), and the right end of the curved ridge (1-7) extends to the middle of the cylindrical structure; a connector (1-8) is provided on the upper plate (1-2) and the front plate (1-4), and a central post (1-9) is provided on the lower plate (1-3) and the rear plate (1-5) corresponding to the connector (1-8), the outer end of the central post (1-9) is located outside the antenna body (1), and the inner end of the central post (1-9) is located inside the corresponding connector (1-8).

2. The high-gain dual-polarized wideband horn antenna of claim 1, wherein: A snap-fit ​​protrusion (1-10) is formed on the right end face of the cylindrical structure, and the snap-fit ​​protrusion (1-10) is inserted into the slot (2-2) on the left end face of the radial port extension cylinder (2).

3. The high-gain dual-polarized wideband horn antenna of claim 1, wherein: The cover plate (1-6) includes a cover plate body (1-6-1). A right-extending snap-fit ​​boss (1-6-2) is formed on the right end face of the cover plate body (1-6-1). A snap-fit ​​groove (1-6-3) that is adapted to the curved ridge (1-7) is formed on the upper, lower, front, rear and side surfaces of the snap-fit ​​boss (1-6-2). The left end of the curved ridge (1-7) is snapped into the snap-fit ​​groove (1-6-3).

4. The high-gain dual-polarized wideband horn antenna of claim 3, wherein: The front plate (1-4) and the rear plate (1-5) are symmetrically arranged. The front plate (1-4) includes a first horizontal part (1-4-1). A first inclined part (1-4-2) is connected to the right side of the first horizontal part (1-4-1). The right end of the first inclined part (1-4-2) is inclined outward. A first central hole (1-4-3) is formed in the middle of the first horizontal part (1-4-1) and extends through its front and rear sides. The first central hole (1-4-3) is adapted to the central column (1-9). A curved ridge (1-7) is set along the central axis of the front plate (1-4). The curved ridge (1-7) is provided with a snap-fit ​​boss at its left end, which is inserted into the corresponding snap-fit ​​groove (1-6-3). The curved ridge (1-7) extends to the right end of the front plate (1-4) to the middle of the first inclined portion (1-4-2). The right end of the first inclined portion (1-4-2) is provided with an upwardly extending first connecting portion (1-4-4) and a rightward extending first protrusion (1-4-5). Mounting holes are formed on the first horizontal portion (1-4-1), the first inclined portion (1-4-2), and the first connecting portion (1-4-4).

5. The high-gain dual-polarized broadband horn antenna as described in claim 3, characterized in that: The upper plate (1-2) and the lower plate (1-3) are symmetrically arranged. The upper plate (1-2) includes a second horizontal part (1-2-1). A second inclined part (1-2-2) is connected to the right side of the second horizontal part (1-2-1). The right end of the second inclined part (1-2-2) is inclined outward. A second central hole (1-2-3) is formed in the middle of the second horizontal part (1-2-1) and penetrates its upper and lower sides. The second central hole (1-2-3) is adapted to the central column (1-9). The curved ridge (1-7) is set along the central axis of the upper plate (1-2). The curved ridge (1-7) is provided with a snap-fit ​​boss at its left end, which is inserted into the corresponding snap-fit ​​groove (1-6-3). The curved ridge (1-7) extends to the right end of the upper plate (1-2) to the middle of the second inclined portion (1-2-2). The right end of the second inclined portion (1-2-2) is provided with an upwardly extending second connecting portion (1-2-4) and a rightward extending second protrusion (1-2-5). Mounting holes are formed on the second horizontal portion (1-2-1), the second inclined portion (1-2-2), and the second connecting portion (1-2-4).

6. The high-gain dual-polarized wideband horn antenna of claim 1, wherein: The ridge curves of the curves (1-7) conform to the curve equation: , where y represents the height of the ridge, x represents the length of the ridge, x = 0.86215442~26, and a, b, c are constants.

7. The high-gain dual-polarized wideband horn antenna of claim 4, wherein: The front curved ridge, the rear curved ridge, and the rear plate opposite to the first central hole (1-4-3) are respectively formed with a third central hole, a fifth central hole, and a seventh central hole. The front end of the first central post passes through the seventh central hole on the rear plate, the fifth central hole on the rear curved ridge, and the third central hole on the front curved ridge in sequence before entering the first central hole. The first central post does not contact the inner wall of the first central hole, the third central hole, the fifth central hole, and the seventh central hole. A connector (1-8) is fixed on the outside of the first central hole.

8. The high-gain dual-polarized wideband horn antenna of claim 5, wherein: The upper curved ridge, the lower curved ridge, and the lower plate opposite to the second central hole (1-2-3) are respectively formed with a fourth central hole, a sixth central hole, and an eighth central hole. The front end of the second central post passes through the eighth central hole on the lower plate, the sixth central hole on the lower curved ridge, and the fourth central hole on the upper curved ridge in sequence before entering the second central hole. The second central post does not contact the inner walls of the second central hole, the fourth central hole, the sixth central hole, and the eighth central hole. A connector (1-8) is fixed on the outside of the second central hole.

9. The high-gain dual-polarized wideband horn antenna of claim 1, wherein: The antenna body (1) and the radiating port extension tube (2) are fixedly connected by positioning pins (3) and mounting screws (4). The upper plate (1-2), lower plate (1-3), front plate (1-4) and rear plate (1-5) are fixedly connected by mounting screws. The cover plate (1-6) is fixedly connected to the upper plate (1-2), lower plate (1-3), front plate (1-4) and rear plate (1-5) by positioning pins (3) and mounting screws (4).

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