A fixing device for aerospace magnetic field measuring instrument

Abstract

The present invention relates to the field of aerospace technology, and more specifically, to a fixing device for an aerospace magnetic field measuring instrument, comprising a base, a placing mechanism installed on the base, a fixing mechanism connected internally to the placing mechanism, a protective mechanism connected to the placing mechanism, a monitoring mechanism installed on the placing mechanism, and an adjusting mechanism installed internally to the base; the placing mechanism and the fixing mechanism facilitate the storage and fixing of measuring instrument bodies of different sizes, thereby facilitating magnetic field detection; the placing mechanism drives the protective mechanism so that the protective mechanism locks the fixing mechanism, thereby ensuring that the measuring instrument body is stably and firmly installed and not easily loosened; the monitoring mechanism facilitates the detection of the airflow state of an aircraft during flight, thereby ensuring the normal flight of the aircraft; the adjusting mechanism facilitates the adjustment of the orientation of the placing mechanism, thereby achieving better detection of the magnetic field and airflow.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, in particular to a fixing device for an aerospace magnetic field measuring instrument. Background Art

[0002] Airborne magnetic survey, also known as aeromagnetic survey or aeromagnetic exploration, is the oldest, most mature and most widely used magnetic survey method among airborne geophysical prospecting methods. It is a geophysical method that measures the strength or gradient of the Earth's magnetic field over the survey area according to a pre-set survey line and altitude by mounting an airborne magnetometer and its supporting auxiliary equipment on an aircraft.

[0003] However, traditional aerospace magnetic field measuring instruments are fixed to the aircraft by bolts when installed, which makes subsequent replacement and maintenance inconvenient and cumbersome, reducing installation efficiency. It is also inconvenient to install and place different measuring instruments, reducing the measurement range. At the same time, it is inconvenient to fine-tune the installed instruments, thus affecting the measurement quality. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a fixing device for an aerospace magnetic field measuring instrument.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a fixing device for a space magnetic field measuring instrument, comprising a base, a placing mechanism installed on the base, a fixing mechanism connected inside the placing mechanism, a protective mechanism connected to the placing mechanism, a monitoring mechanism installed on the placing mechanism, and an adjusting mechanism installed inside the base.

[0006] Specifically, the placement mechanism includes a connecting block, the base is mounted with the connecting block, a placement box is welded on the connecting block, the placement box is a cylindrical structure with a hollow interior, and one end of the placement box is threadedly connected to a protective cover.

[0007] Specifically, one end of the placement box and the protective cover are both elliptical structures, a sealing ring is installed on the inner side of the placement box, and the inner side of the protective cover contacts the sealing ring.

[0008] Specifically, the base is a "concave" shaped structure, and a plurality of drainage grooves are provided on the base, and the drainage grooves are a "T" shaped structure.

[0009] Specifically, rubber blocks are installed inside the protective cover and the placement box respectively. One end of the two rubber blocks is slidably connected to the protective cover and the placement box respectively through a resistance spring, and the other end of the two rubber blocks respectively resists the two ends of the measuring instrument body.

[0010] Specifically, the fixing mechanism includes two groups of symmetrical clamps, and the inside of the placement box is provided with two groups of symmetrical clamps. One side of the four clamps is slidably connected to the inside of the placement box through multiple compression springs, and the other sides of the four clamps are respectively in contact with the side walls of the measuring instrument body.

[0011] Specifically, a guide rod is vertically fixedly connected to the center of one side of the four splints, four guide grooves are provided inside the side wall of the placement box, the four guide rods respectively pass through the compression springs and extend into the guide grooves, and the guide rods are slidably connected to the guide grooves.

[0012] Specifically, the protective mechanism includes a rubber pad, the four guide rod side walls are respectively fixedly connected to the rubber pad, four push rods and four driving rods are slidably connected to the inside of the placement box side wall, the push rods and the driving rods are connected by a buffer spring, and the push rods are slidably connected to the inside of the placement box through a reset spring, and one end of the four push rods is respectively installed with a push block, the push block extends to the inside of the guide groove and contacts the rubber pad, and one end of the four driving rods extends to the outside of the placement box and contacts the protective cover.

[0013] Specifically, the monitoring mechanism includes a guide groove, and multiple guide grooves are provided on the outside of the protective cover. The guide groove is an arc-shaped structure. The inside of the protective cover is snap-connected with an airflow detector. The side wall of the airflow detector extends into the inside of the guide groove. A nut is rotatably connected to the airflow detector. The nut is connected to the internal thread of one side of the protective cover. A protective pad is installed on the inside of the protective cover, and one end of the airflow detector is in conflict with the protective pad.

[0014] Specifically, the adjusting mechanism includes a rotating shaft, a rotating shaft is welded at the center of the connecting block, the rotating shaft is rotatably connected to the center of the base, the connecting block is rotatably connected to the base through the rotating shaft, a tooth plate with an arc structure is installed on the connecting block, a clamping block is installed on the base, the clamping block is slidably connected to the base through a plurality of extrusion springs, one end of the clamping block is a toothed structure, the clamping block is in conflict with the rack, the clamping block is a "C"-shaped structure, the inner side of the clamping block is rotatably connected to a movable rod, the base is slidably connected to a pressure rod, and one end of the pressure rod is rotatably connected to the movable rod.

[0015] Specifically, a pressure block is installed at one end of the base, the pressure block is slidably connected to the base through a pressure spring, one side of the pressure block is fixedly connected to the pressure rod, and a groove is provided on the outer side of the pressure block.

[0016] Specifically, the base is provided with a plurality of equally spaced fixing holes, both ends of the fixing holes extend to the outside of the base, and the fixing holes are cylindrical "T"-shaped structures.

[0017] The beneficial effects of the present invention are:

[0018] (1) The fixing device for aerospace magnetic field measuring instrument described in the present invention is convenient for storing and fixing measuring instrument bodies of different sizes through the action of the placement mechanism and the fixing mechanism, and is convenient for magnetic field detection work, that is: through the action of the base, the placement box is conveniently connected to the aircraft through the connecting block, the placement box is convenient for placing the measuring instrument body, and the protective cover is used to protect the measuring instrument body inside the placement box, thereby facilitating regional magnetic field measurement work, the elliptical design plays a role in reducing wind resistance, and at the same time, the sealing ring plays a sealing role to prevent dust and moisture from entering the placement box, the connection block is installed through the action of the base, and at the same time, the accumulated moisture is conveniently discharged through the action of the drainage groove, reducing corrosion to the device, and the measurement body placed inside the placement box is stably and firmly installed and not easy to loosen under the action of the rubber block and the resistance spring, which is convenient for better detection work, and the four clamping plates and multiple compression springs are conducive to clamping the measurement body stably and firmly, and conveniently clamping and fixing measurement instrument bodies of different sizes, and the installation of the guide rod makes the clamping plate slide smoothly inside the placement box without causing offset.

[0019] (2) The fixing device for aerospace magnetic field measuring instrument described in the present invention drives the protective mechanism through the placement mechanism, so that the protective mechanism locks the fixing mechanism, so that the measuring instrument body is installed stably and firmly and not easy to loosen, that is: through the closing of the protective cover, the protective cover contacts the four driving rods, the driving rod drives the buffer spring to drive the push rod, and the push rod drives the push block to contact and limit the rubber block and the guide rod, so that the pressure plate is not easy to loosen, which is conducive to the stable and firm installation of the measuring instrument body, and the buffer spring makes the driving rod and the push rod have elasticity, so that the protective cover is closed tightly and is firm and not easy to loosen.

[0020] (3) The fixing device for aerospace magnetic field measuring instrument described in the present invention is conducive to detecting the airflow state of an aircraft during flight through the action of a monitoring mechanism, thereby ensuring the normal flight of the aircraft, that is: the airflow detector is stably installed through the action of nuts and protective pads, and the airflow contacts the outside of the airflow detector when flowing inside the guide groove, thereby detecting the humidity and flow rate in the airflow.

[0021] (4) The fixing device for aerospace magnetic field measuring instrument described in the present invention facilitates the adjustment of the orientation of the placement mechanism under the action of the adjustment mechanism, thereby achieving better detection of the magnetic field and airflow, namely: the connection block and the placement box can be rotated on the base under the action of the rotating shaft, which facilitates the adjustment of the orientation of the measuring instrument body; the card block is limited by the interference of the squeezing spring on the card block, so that the connection block is not easy to rotate; by pressing the pressure rod, the pressure rod drives the movable rod to squeeze the card block, so that the card block is separated from the tooth plate under the action of the squeezing spring, thereby facilitating the swing of the connection block; the pressure rod is conveniently driven and controlled by the action of the pressure block, and at the same time, the groove plays a role of anti-slip and convenient pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of a fixing device for an aerospace magnetic field measuring instrument provided by the present invention;

[0024] Figure 2 This is a schematic diagram of the connection structure between the base and the connecting block of the present invention;

[0025] Figure 3 for Figure 2 An enlarged schematic diagram of the structure of section A is shown;

[0026] Figure 4 This is a schematic diagram of the connection structure between the placement box, the protective cover and the measuring instrument body of the present invention;

[0027] Figure 5 for Figure 4 An enlarged schematic diagram of the structure of part B is shown;

[0028] Figure 6 for Figure 4 The enlarged schematic diagram of the C-section structure is shown;

[0029] Figure 7 for Figure 4 The enlarged schematic diagram of the D part structure is shown.

[0030] In the figure: 1. Base; 2. Placement mechanism; 201. Fixing hole; 202. Connecting block; 203. Placement box; 204. Protective cover; 205. Drainage groove; 206. Rubber block; 207. Resistance spring; 208. Sealing ring; 3. Fixing mechanism; 301. Clamp; 302. Compression spring; 303. Guide groove; 304. Guide rod; 4. Protective mechanism; 401. Ejector rod; 402. Ejector block; 403. Rubber pad; 4 04. Driving rod; 405. Buffer spring; 406. Return spring; 5. Adjusting mechanism; 501. Rotating shaft; 502. Tooth plate; 503. Block; 504. Extrusion spring; 505. Movable rod; 506. Pressure rod; 507. Pressing spring; 508. Pressure block; 509. Groove; 6. Monitoring mechanism; 601. Guide groove; 602. Nut; 603. Airflow detector; 604. Protective pad; 7. Measuring instrument body. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] like Figure 1-Figure 7 As shown, the fixing device for a space magnetic field measuring instrument described in the present invention includes a base 1, a placing mechanism 2 is installed on the base 1, a fixing mechanism 3 is connected inside the placing mechanism 2, a protective mechanism 4 is connected to the placing mechanism 2, a monitoring mechanism 6 is installed on the placing mechanism 2, and an adjusting mechanism 5 is installed inside the base 1.

[0033] Specifically, the placement mechanism 2 includes a connecting block 202, the connecting block 202 is installed on the base 1, and a placement box 203 is welded on the connecting block 202. The placement box 203 is a cylindrical structure with a hollow interior. A protective cover 204 is threadedly connected to one end of the placement box 203. Under the action of the base 1, the placement box 203 is conveniently connected to the aircraft through the connecting block 202. Under the action of the placement box 203, the measuring instrument body 7 is conveniently placed, and the measuring instrument body 7 is protected inside the placement box 203 by the protective cover 204, thereby facilitating regional magnetic field measurement.

[0034] Specifically, the placement box 203 and one end of the protective cover 204 are both elliptical structures. A sealing ring 208 is installed on the inner side of the placement box 203. The inner side of the protective cover 204 contacts the sealing ring 208. The elliptical design reduces wind resistance. At the same time, the sealing ring 208 acts as a seal to prevent dust and moisture from entering the interior of the placement box 203.

[0035] Specifically, the base 1 is a "concave" shaped structure, and a plurality of drainage grooves 205 are provided on the base 1. The drainage grooves 205 are a "T" shaped structure. The connecting block 202 is installed under the action of the base 1. At the same time, the drainage grooves 205 facilitate the discharge of accumulated moisture and reduce corrosion to the device.

[0036] Specifically, rubber blocks 206 are respectively installed inside the protective cover 204 and the placement box 203. One end of the two rubber blocks 206 is slidably connected to the protective cover 204 and the placement box 203 through a resistance spring 207, and the other end of the two rubber blocks 206 is respectively in resistance with the two ends of the measuring instrument body 7. Under the action of the rubber blocks 206 and the resistance springs 207, the measuring instrument body 7 placed inside the placement box 203 is stably and firmly installed and not easy to loosen, which facilitates better detection work.

[0037] Specifically, the fixing mechanism 3 includes a clamping plate 301, and two groups of symmetrical clamping plates 301 are provided inside the placement box 203. One side of the four clamping plates 301 is slidably connected to the inside of the placement box 203 through multiple compression springs 302, and the other sides of the four clamping plates 301 are respectively in contact with the side walls of the measuring instrument body 7. The action of the four clamping plates 301 and the multiple compression springs 302 is conducive to stably and firmly clamping the measuring instrument body 7, and it is convenient to clamp and fix the measuring instrument body 7 of different sizes.

[0038] Specifically, a guide rod 304 is vertically fixedly connected to the center of one side of the four splints 301, and four guide grooves 303 are provided inside the side wall of the placement box 203. The four guide rods 304 respectively pass through the compression springs 302 and extend into the guide grooves 303. The guide rods 304 are slidably connected to the guide grooves 303. Through the installation of the guide rods 304, the splints 301 can slide smoothly inside the placement box 203 without causing deviation.

[0039] Specifically, the protective mechanism 4 includes a rubber pad 403, the side walls of the four guide rods 304 are respectively fixedly connected with the rubber pad 403, the side walls of the placement box 203 are slidably connected with four push rods 401 and four drive rods 404, the push rods 401 and the drive rods 404 are connected by a buffer spring 405, the push rod 401 is slidably connected to the inside of the placement box 203 by a return spring 406, one end of the four push rods 401 is respectively installed with a push block 402, the push block 402 extends to the inside of the guide groove 303 and contacts the rubber pad 403, and one end of the four drive rods 404 extends to the placement box 203 The outer side contacts the protective cover 204. Through the closing of the protective cover 204, the protective cover 204 contacts the four driving rods 404. The driving rod 404 drives the buffer spring 405 to drive the top rod 401. The top rod 401 drives the top block 402 to contact and limit the rubber block 206 and the guide rod 304, so that the pressure plate is not easy to loosen, which is conducive to the stable and firm installation of the measuring instrument body 7. The buffer spring 405 makes the driving rod 404 and the top rod 401 elastic, so that the protective cover 204 is closed tightly and firmly.

[0040] Specifically, the monitoring mechanism 6 includes a guide groove 601, and multiple guide grooves 601 are provided on the outside of the protective cover 204. The guide groove 601 is an arc-shaped structure. The protective cover 204 is internally engaged with an airflow detector 603, and the side wall of the airflow detector 603 extends into the inside of the guide groove 601. A nut 602 is rotatably connected to the airflow detector 603, and the nut 602 is connected to the internal thread of one side of the protective cover 204. A protective pad 604 is installed on the inside of the protective cover 204. One end of the airflow detector 603 is in conflict with the protective pad 604. Under the action of the nut 602 and the protective pad 604, the airflow detector 603 is installed stably. When the airflow flows inside the guide groove 601, it will contact the outside of the airflow detector 603, thereby detecting the humidity and flow rate in the airflow.

[0041] Specifically, the adjustment mechanism 5 includes a rotating shaft 501, a rotating shaft 501 is welded at the center of the connecting block 202, the rotating shaft 501 is rotatably connected to the center of the base 1, the connecting block 202 is rotatably connected to the base 1 through the rotating shaft 501, a tooth plate 502 with an arc structure is installed on the connecting block 202, and a clamping block 503 is installed on the base 1, and the clamping block 503 is slidably connected to the base 1 through a plurality of extrusion springs 504, one end of the clamping block 503 is a toothed structure, the clamping block 503 conflicts with the rack, and the clamping block 503 is a "C"-shaped structure, the inner side of the clamping block 503 is rotatably connected to the movable rod 505, and the base 1 is internally slidably connected to the pressure rod 50 6. One end of the pressure rod 506 is rotatably connected to the movable rod 505. Under the action of the rotating shaft 501, the connecting block 202 and the placement box 203 can be rotated on the base 1, which is convenient for adjusting the position of the measuring instrument body 7. The compression spring 504 resists the block 503, so that the block 503 is restrained against the rack, making it difficult for the connecting block 202 to rotate. By pressing the pressure rod 506, the pressure rod 506 drives the movable rod 505 to squeeze the block 503, so that the block 503 is freed from the action of the compression spring 504 and separated from the tooth plate 502, thereby facilitating the swing of the connecting block 202.

[0042] Specifically, a pressure block 508 is installed at one end of the base 1. The pressure block 508 is slidably connected to the base 1 through a pressing spring 507. One side of the pressure block 508 is fixedly connected to the pressure rod 506. A groove 509 is provided on the outer side of the pressure block 508. The pressure block 508 facilitates the drive control of the pressure rod 506, and the groove 509 plays a role in preventing slipping and facilitating pressing.

[0043] Specifically, the base 1 is provided with a plurality of equally spaced fixing holes 201, both ends of the fixing holes 201 extend to the outside of the base 1, and the fixing holes 201 are cylindrical "T"-shaped structures, which facilitate the detachable installation of the base 1 and the aircraft through the action of the fixing holes 201.

[0044] When the present invention is in use, first, the base 1 is prepared for detachable installation and fixing of the aircraft through the multiple fixing holes 201, and the placement box 203 is conveniently connected to the aircraft through the connecting block 202 under the action of the base 1. The measuring instrument body 7 is conveniently placed under the action of the placement box 203, and the measuring instrument body 7 is protected inside the placement box 203 by the protective cover 204, so as to facilitate the regional magnetic field measurement work. The elliptical design plays a role in reducing wind resistance, and at the same time, the sealing ring 208 plays a sealing role to prevent dust and moisture from entering the placement box 203. The connecting block 202 is connected to the base 1. The installation is convenient, and the accumulated water is discharged conveniently through the action of the drainage groove 205, which reduces the corrosion of the device. The measuring instrument body 7 placed inside the placement box 203 is stably and firmly installed and not easy to loosen under the action of the rubber block 206 and the resistance spring 207, which facilitates better detection work. The four clamping plates 301 and multiple compression springs 302 are conducive to the stable and firm clamping of the measuring instrument body 7, and convenient for clamping and fixing measuring instrument bodies 7 of different sizes. The installation of the guide rod 304 makes the clamping plate 301 slide smoothly inside the placement box 203 without causing deviation. By closing the protective cover 204, the protective cover 204 The four driving rods 404 are in conflict with each other, and the driving rod 404 drives the buffer spring 405 to drive the top rod 401, and the top rod 401 drives the top block 402 to conflict and limit the rubber block 206 and the guide rod 304, so that the pressure plate is not easy to loosen, which is conducive to the stable and firm installation of the measuring instrument body 7. The driving rod 404 and the top rod 401 are elastic under the action of the buffer spring 405, so that the protective cover 204 is tightly closed and not easy to loosen. The airflow detector 603 is stably installed under the action of the nut 602 and the protective pad 604. When the airflow flows inside the guide groove 601, it contacts the outside of the airflow detector 603, thereby detecting the humidity and flow rate in the airflow. The measuring device 202 is convenient for measuring and can be used to measure the position of the measuring instrument body 7 by rotating the connecting block 202 and the placement box 203 on the base 1. ...

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0046] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A fixing device for an aerospace magnetic field measuring instrument, characterized in that: The invention comprises a base (1), a placing mechanism (2) is installed on the base (1), a fixing mechanism (3) is connected to the inside of the placing mechanism (2), a protection mechanism (4) is connected to the placing mechanism (2), a monitoring mechanism (6) is installed on the placing mechanism (2), and an adjusting mechanism (5) is installed inside the base (1); The placement mechanism (2) comprises a connecting block (202), the connecting block (202) is mounted on the base (1), a placement box (203) is welded on the connecting block (202), the placement box (203) is a cylindrical structure with a hollow interior, and a protective cover (204) is threadedly connected to one end of the placement box (203); The fixing mechanism (3) includes a clamping plate (301), and two groups of symmetrical clamping plates (301) are provided inside the placement box (203). One side of the four clamping plates (301) is slidably connected to the inside of the placement box (203) through a plurality of compression springs (302), and the other side of the four clamping plates (301) is in contact with the side wall of the measuring instrument body (7). The base (1) is a "concave"-shaped structure, and a plurality of drainage grooves (205) are provided on the base (1), and the drainage grooves (205) are a "T"-shaped structure; The protective cover (204) and the placement box (203) are respectively installed with rubber blocks (206), one end of the two rubber blocks (206) is slidably connected to the protective cover (204) and the placement box (203) via a resistance spring (207), and the other end of the two rubber blocks (206) is respectively in resistance with two ends of the measuring instrument body (7); A guide rod (304) is vertically fixedly connected to the center of one side of the four clamping plates (301), and four guide grooves (303) are provided inside the side wall of the placement box (203). The four guide rods (304) respectively penetrate the compression springs (302) and extend into the guide grooves (303). The guide rods (304) are slidably connected to the guide grooves (303); The protective mechanism (4) includes a rubber pad (403), the side walls of the four guide rods (304) are respectively fixedly connected with the rubber pad (403), the side walls of the placement box (203) are slidably connected with four push rods (401) and four driving rods (404), the push rods (401) and the driving rods (404) are connected via a buffer spring (405), the push rods (401) are slidably connected to the inside of the placement box (203) via a return spring (406), one end of the four push rods (401) is respectively installed with a push block (402), the push block (402) extends to the inside of the guide groove (303) and contacts the rubber pad (403), and one end of the four driving rods (404) respectively extends to the outside of the placement box (203) and contacts the protective cover (204); The monitoring mechanism (6) includes a guide groove (601), a plurality of guide grooves (601) are provided on the outer side of the protective cover (204), the guide groove (601) is an arc-shaped structure, an airflow detector (603) is engaged and connected inside the protective cover (204), a side wall of the airflow detector (603) extends into the inside of the guide groove (601), a nut (602) is rotatably connected to the airflow detector (603), the nut (602) is connected to the inner thread of one side of the protective cover (204), a protective pad (604) is installed on the inner side of the protective cover (204), and one end of the airflow detector (603) is in contact with the protective pad (604); The adjusting mechanism (5) includes a rotating shaft (501), a rotating shaft (501) is welded at the center of the connecting block (202), the rotating shaft (501) is rotatably connected to the center of the base (1), the connecting block (202) is rotatably connected to the base (1) via the rotating shaft (501), a tooth plate (502) with an arc structure is installed on the connecting block (202), a clamping block (503) is installed on the base (1), the clamping block (503) is slidably connected to the base (1) via a plurality of extrusion springs (504), one end of the clamping block (503) is a tooth structure, the clamping block (503) is in conflict with the rack, the clamping block (503) is a "C"-shaped structure, the inner side of the clamping block (503) is rotatably connected to a movable rod (505), the inner side of the base (1) is slidably connected to a pressure rod (506), and one end of the pressure rod (506) is rotatably connected to the movable rod (505); A pressure block (508) is installed at one end of the base (1), and the pressure block (508) is slidably connected to the base (1) via a pressure spring (507). One side of the pressure block (508) is fixedly connected to the pressure rod (506), and a groove (509) is provided on the outer side of the pressure block (508); The base (1) is provided with a plurality of equally spaced fixing holes (201), both ends of the fixing holes (201) extend to the outside of the base (1), and the fixing holes (201) are cylindrical "T"-shaped structures.

2. The fixing device for an aerospace magnetic field measuring instrument according to claim 1, characterized in that: One end of the placement box (203) and the protective cover (204) are both elliptical structures. A sealing ring (208) is installed on the inner side of the placement box (203), and the inner side of the protective cover (204) is in contact with the sealing ring (208).

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