CN111703537A - Retractable connecting bridge and working method - Google Patents

Abstract

The invention relates to a retractable connecting bridge. A first electromagnet is provided on each side of the oblique root of a single-shell torsion-resistant box body; a plurality of second electromagnets are arranged inside the single-shell torsion-resistant box body, each A first sleeve is set directly above the electromagnet, and each inner surface of the straight part is provided with a sliding rail along the length direction, which forms a rolling pair with the universal ball chain in the double-shell anti-torsion box; There is a second sleeve; the telescopic unit includes a first electro-hydraulic push rod, and the end of the first electro-hydraulic push rod is provided with a third electromagnet aligned with the first electromagnet; the locking unit includes a double-shell anti-torsion box body The second electro-hydraulic push rod on the outer surface corresponding to the position of the second sleeve, the fourth electromagnet located at the end of the second electro-hydraulic push rod, and the plug located in the first sleeve. The invention makes up for the problem of weakened torsion resistance caused by the hollow inside; eliminates various forces transmitted from the sheet body to the telescopic rod through the single-shell torsion box body, and reduces the probability of deformation and failure of the moving parts.

Description

Retractable connecting bridge and working method

technical field

The present invention relates to a connecting bridge, in particular, to a telescopic connecting bridge for a multihull ship and a working method thereof.

Background technique

The relative position between the hull and the main hull of the multihull has a great influence on the stability, rapidity and resistance of the multihull. When the relative position of the hull and the main hull is suitable, it can produce favorable interference and reduce the resistance of the ship. .

Therefore, there are some designs related to adjusting the distance between the main hull and the sheet body in the prior art, and the related patent applications include:

The publication date is November 21, 2012, the publication number is CN102785757A, and the Chinese patent document titled "Moveable Side Body Structure of Trimaran", after the sheet body is moved in place by a screw or a hydraulic cylinder, the propulsion mechanism is not the same as the sheet body. Disengagement; the publication number is CN102941905A, the publication date is February 27, 2013, and the Chinese patent document entitled "Trimaran with Floating Side Hull" is used. The lead screw of the propulsion mechanism is not out of contact with the mobile sliding table connected to the same body; the publication number is CN110667770A, the publication date is January 10, 2020, and the Chinese name is "a trimaran that can be used for multi-sea navigation". Patent application, the hydraulic cylinder that pushes the sheet body to change the lateral spacing is not out of contact with the truss structure connected to the sheet body after the sheet body is moved in place; the publication number is CN108275242A, the publication date is July 13, 2018, and the name is "One The Chinese patent document of "Modular Trimaran with Moveable Seed Body", the lateral sliding mechanism is not out of contact with the sheet body after the sheet body is moved in place.

The above application has the following shortcomings: 1. It can be seen from the ship theory that multihull ships including trimarans will bear bending moments and torques in all directions, and the connecting bridge needs to have sufficient bending and torsional resistance. The torsion-resistant structure of the connecting bridge is not mentioned in the aforementioned applications. The commonly used telescopic mechanism, especially the multi-section telescopic mechanism, mostly adopts a structure similar to that of the telescopic boom. The cross-section of this type of boom is closed, but due to the need to slide and expand, except for the last boom, the rest of the boom is internally There is no or very small skeleton, so the torsion resistance is poor.

2. In the aforementioned application, after the moving mechanism of the driving side hull or the connecting bridge connected to it moves in place, after the target component is moved in place, because it is not in contact with the sheet body or with the structure connected to the sheet body, then the sheet body is not in contact with the sheet body during the voyage. External loads such as wave force will also be transmitted to the above-mentioned propulsion mechanism, and such propulsion mechanisms are mainly rods subject to axial force, such as screw rods, screws, and piston rods of hydraulic cylinders, which are difficult to withstand the transmission of the sheet. The bending moment and torque will easily lead to the deformation and failure of the above-mentioned rods.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a telescopic connecting bridge to solve the problem of insufficient torsional resistance of the connecting bridge between the main body and the sheet body of the multihull ship. The structure of electro-hydraulic push rod, electromagnet, bushing and pin is matched with each other, and the reliability is very high.

The present invention adopts following technical scheme:

A retractable connection bridge, comprising a double-shell torsion box 200, a single-shell torsion box 210, a telescopic unit, and a locking unit; The cross-section is two concentric and concentric figures, and the outer surface 201 of the shell and the inner surface 202 of the shell are connected together by structural parts; The cross section of the inner and outer surfaces of the shell 200 is the same shape, and there are also structural parts inside; the double-shell torsion box 200 and the single-shell torsion box 210 each have an oblique root and a straight part; the single-shell torsion box 210 has an oblique root. A baffle plate 214 is installed on each side of the baffle plate, and a first electromagnet 215 is installed on the baffle plate; a plurality of second electromagnets 217 are arranged inside the single-shell torsion box body 210, and a second electromagnet 217 is arranged directly above each second electromagnet. A sleeve 218, each inner surface of the straight part is provided with a sliding rail 219 along the length direction, and forms a rolling pair with the universal ball chain 209 in the double-shell anti-torsion box 200, and the straight part of the single-shell anti-torsion box In the straight part of the double-shell torsion box body; the double-shell torsion box body 200 is provided with a second sleeve 208; the telescopic unit includes a first electro-hydraulic push rod 221, the first electric The end of the hydraulic push rod 221 is provided with a third electromagnet 222, and the third electromagnet 222 is aligned with the first electromagnet 215; the telescopic unit is used to drive the single-shell anti-torsion box 210 to resist torsion relative to the double-shell The box 200 moves; when the straight portion of the single-shell torsion box 210 is completely inserted into the straight portion of the double-shell torsion box 200, the first electromagnet 215 and the third electromagnet 222 on the telescopic unit remain set The distance between the outermost first sleeve 218 and the second sleeve 208 is aligned; the locking unit includes a second sleeve that is perpendicular to the outer surface of the double-shell torsion box 200 and corresponds to the position of the second sleeve 208 The electro-hydraulic push rod 231 , the fourth electromagnet 232 located at the end of the second electro-hydraulic push rod 231 , and the plug 233 located in the first sleeve 218 .

Preferably, the double-shell anti-torsion box 200 is provided with a third sleeve 205 near one end of its inner oblique root portion. The upper and lower ends of the third sleeve 205 are provided with rolling bearings 206. The inner upper end of the oblique root portion A rotating handle 207 is provided, the third sleeve 205 and its rolling bearing 206 are used to connect the telescopic connecting bridge to the main hull, and the shaft 216 on the single-shell torsion box 210 is used to connect the telescopic connecting bridge to the sheet body. connect.

Preferably, the first electromagnet, the second electromagnet, the third electromagnet and the fourth electromagnet are electric permanent magnet chucks.

Preferably, the height of the oblique root portion of the double-shell torsion box 200 is not less than 1.5 times the height of the straight portion, and the horizontal length of the oblique root portion is not less than 1.5 times the height of the straight portion; The spacing is not more than 500mm.

Preferably, the height of the top of the oblique root part of the single-shell torsion box 210 is not less than 1.5 times the height of the straight part, the horizontal length of the oblique root part is not less than 1.5 times the height of the straight part, and each transverse structural member 213 The spacing between them is not more than 500mm.

A working method of a retractable connection bridge, using the above-mentioned retractable connection bridge;

In the working state: the first electro-hydraulic push rod 221 of the telescopic unit is activated to make the telescopic rod extend outward. It is magnetized with the first electromagnet 215 so that opposites attract each other, and the first electro-hydraulic push rod 221 is locked; Demagnetize, extend the second electro-hydraulic push rod 231, insert it into the second sleeve 208, contact with the plug 233, magnetize the fourth electromagnet 232, firmly suck the plug 233, and then push the second electro-hydraulic push rod 231 upward Retract, take all the pins 233 away from the sleeve 218, and bring them all into the second sleeve 208, then lock the second electro-hydraulic push rod 231, and keep the fourth electromagnet 232 to continue sucking the pins 233; then unlock the first The electro-hydraulic push rod 221 continues to stretch out. As the telescopic rod of the first electro-hydraulic push rod 221 continues to stretch out, the straight part of the single-shell torsion-resistant box 210 is continuously removed from the double-shell torsion-proof box. When pushed to the set position, the second sleeve 208 is aligned with the other first sleeve 218, unlocking the second electro-hydraulic push rod 231, making it protrude downward, and driving the latch 233 Insert downward until the bottom of the plug 233 is in contact with the second electromagnet 217 here. At this time, the plug 233 is still partially located in the second sleeve 208; then the fourth electromagnet 232 is demagnetized, and the second hydraulic push rod 231 Retract, magnetize the second electromagnet 217 here, and firmly suck the latch 233; finally, demagnetize both the third electromagnet 222 and the first electromagnet 215, and retract the first electro-hydraulic push rod 221; The extension and locking of the shell torsion box 210;

In the non-working state: extend the retracted first electro-hydraulic push rod 221 again and make contact with the first electromagnet 215, and then magnetize the third electromagnet 222 and the first electromagnet 215 and make them in opposite sex phases. and lock the first electro-hydraulic push rod 221; then demagnetize the second electromagnet 217 below the latch 233, and extend the second electro-hydraulic push rod 231 downward, so that the fourth electromagnet 232 on it and the latch 233 contact, then the fourth electromagnet 232 is magnetized, the second electro-hydraulic push rod 231 is retracted, the plug 233 is completely brought into the second sleeve 208, and the fourth electromagnet 232 is kept firmly sucking the plug 233; Then, the first electro-hydraulic push rod 221 is unlocked and retracted, which drives the single-shell anti-torsion box 210 to retract accordingly. After retracting in place, the second electro-hydraulic push rod 231 is activated to drive the latch 233 to be inserted downward until The bottom of the latch 233 is in contact with the second electromagnet 217 at the outermost end of the single-shell anti-torsion box 210, then the fourth electromagnet 232 is demagnetized, and the second electro-hydraulic push rod 231 is retracted in place, and the second electromagnet 231 here is demagnetized. The iron 217 is magnetized, the latch 233 is firmly sucked, both the third electromagnet 222 and the first electromagnet 215 are demagnetized, and the first electro-hydraulic push rod 221 is retracted and locked.

The beneficial effects of the present invention are:

1) Both connecting bridges adopt torsion box structure, especially the double-shell torsion box structure, which makes up for the problem of weakened torsion resistance caused by its hollow interior;

2) The use of magnetic force makes the electro-hydraulic push rod of the telescopic unit separate from the single-shell torsion box after the push-pull is completed, eliminating the various forces transmitted from the sheet to the telescopic rod through the single-shell torsion box, reducing the Probability of deformation failure of moving parts.

3) In the design of the telescopic unit and the locking unit, the structure of the electro-hydraulic push rod, electromagnet, sleeve, and latch is used to cooperate with each other, and the reliability is very high.

Description of drawings

Figure 1 is a schematic view of the retractable connecting bridge partially pulled out.

Figure 2 is a schematic cross-sectional view at the non-sleeve of the flat section.

Figure 3 is a schematic cross-sectional view of the sleeve at the flat portion.

In the figure, 200. Double shell torsion box, 210. Single shell torsion box, 201. Double shell torsion box outer surface, 202. Double shell torsion box inner surface, 203. Double shell torsion box Longitudinal Structural Parts, 204. Transverse Structural Parts of Double Shell Torsion Box, 205. Third Sleeve, 206. Rolling Bearing, 207. Turning Shank, 208. Second Sleeve, 209. Universal Ball Chain, 211. Single Shell Surface of torsion box body, 212. Longitudinal structure of single-shell torsion box, 213. Transverse structure of single-shell torsion box, 214. Baffle plate, 215. First electromagnet, 216. Shaft, 217. Second electromagnet, 218. first casing, 219. slide rail, 221. first electro-hydraulic push rod, 222. third electro-hydraulic push rod, 231. second electro-hydraulic push rod, 232. fourth electro-hydraulic push rod, 233. latch .

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

1 to 3 , the cross-sections of the outer surface 201 of the casing and the inner surface 202 of the casing of the double-shell torsion box 200 of the telescopic connecting bridge are two concentric shapes, and the outer surface 201 of the casing and the inner surface 202 of the casing pass through The longitudinal structural member 203 is connected with the transverse structural member 204 as a whole, the height of the oblique root portion of the double-shell torsion box 200 is not less than 1.5 times the height of the straight portion, and the horizontal length of the oblique root portion is not less than 1.5 times the height of the straight portion. The distance between the transverse structural members 204 is not more than 500mm, the inner part of the oblique root part is fixedly installed with a sleeve 205, the upper and lower ends of the sleeve 205 are provided with rolling bearings 206, and the outer upper end of the oblique root part is provided with a rotating handle 207. There is a sleeve 208 running through the inner and outer surfaces of the shell torsion box body 200, and each inner surface of the straight portion has a longitudinally arranged universal ball chain 209.

The cross-section of the shell surface 211 is the same shape as the cross-section of the inner and outer surfaces of the shell of the double-shell torsion box 200, which together with the longitudinal structural members 212 and the transverse structural members 213 form the single-shell torsion box 210. For the twisted box body 210, the height of the top of the oblique root part is not less than 1.5 times the height of the straight part, the horizontal length of the oblique root part is not less than 1.5 times the height of the straight part, and the spacing between the transverse structural parts 213 is not more than 500mm. Each side of the oblique root is provided with a baffle 214, an electromagnet 215 is installed on the baffle 214, a shaft 216 is arranged on the upper part of the oblique root, and a plurality of electromagnets 217 are arranged inside the single-shell torsion box 210, each of which is A sleeve 218 is arranged directly above the electromagnet 217, and each inner surface of the straight portion has a longitudinally arranged slide rail 219, which forms a rolling pair with the universal ball chain 209 in the double-shell anti-torsion box 200, and the single-shell anti-torsion The straight portion of the box body 210 is located in the straight portion of the double-shell torsion-resistant box body 200 . When the straight portion of the single-shell torsion-resistant box body 210 is completely inserted into the straight portion of the double-shell torsion-resistant box body 200 The iron 215 maintains a proper distance from the electromagnet 222 on the telescopic unit, and the outermost sleeve 218 of the single-shell torsion box 210 is aligned with the sleeve 208 of the double-shell torsion box 200;

The end of the split electro-hydraulic push rod 221 is provided with an electromagnet 222. The electromagnet 222 is aligned with the electro-magnet 215 installed on the baffle plate 214 of the single-shell anti-torsion box 210. The electro-hydraulic push rod 221 and the electromagnet 222 are composed of telescopic unit;

The end of the split electro-hydraulic push rod 231 is provided with an electromagnet 232. The electro-hydraulic push rod 231, the electromagnet 232 and the latch 233 constitute a locking unit. The electro-hydraulic push rod 231 and the electromagnet 232 are facing the casing 208 .

The sleeve 205 and its bearing 206 in the double-shell torsion box 200 are used to connect the telescopic connecting bridge with the main hull, and the shaft 216 on the single-shell torsion box 210 is used to connect the telescopic connecting bridge to the sheet body connected.

The electromagnets can also preferably use electric permanent magnet chucks.

When the scalable connection bridge of this embodiment works specifically, it is divided into two situations: a working state and a non-working state:

Working status: start the electro-hydraulic push rod 221 of the telescopic unit, so that the telescopic rod extends outward, when the electromagnet 222 at the end of the telescopic unit contacts the electromagnet 215 at the baffle 214 of the single-shell anti-torsion box 210, Magnetize the electromagnet 222 and the electromagnet 215 to make the opposites attract each other, and lock the electro-hydraulic push rod 221; The electro-hydraulic push rod 231 of the unit extends out, and is inserted into the sleeve 208 on the double-shell anti-torsion box 200, and contacts with the plug 233, magnetizes the electromagnet 232 on the locking unit, and firmly absorbs the plug 233, and then the electro-hydraulic The push rod 231 is retracted upward, and all the pins 233 are taken away from the casing 218 and brought into the casing 208, and then the electro-hydraulic push rod 231 is locked, and the electro-hydraulic push rod 231 is locked, and the electro-hydraulic push rod 233 is kept firmly sucked by the electromagnet 232; then the electro-hydraulic push rod is unlocked 221, so that it continues to extend. As the telescopic rod of the electro-hydraulic push rod 221 continues to extend, the straight portion of the single-shell torsion box 210 is continuously removed from the straight portion of the double-shell torsion box 200. Push out; when pushed to the proper position, the sleeve 208 of the double-shell torsion box 200 is aligned with the other sleeve 218 of the single-shell torsion box 210, unlocking the electro-hydraulic push rod 231 and making it protrude downward, The plug 233 is driven to be inserted downward until the bottom of the plug 233 contacts the electromagnet 217 here. At this time, a part of the plug 233 is still located in the sleeve 208; then the electromagnet 232 is demagnetized, and the hydraulic push rod 231 is retracted. The electromagnet 217 of the telescopic unit is magnetized, and the latch 233 is firmly sucked; finally, both the electromagnet 222 and the electromagnet 215 of the telescopic unit are demagnetized, and the electro-hydraulic push rod 221 of the telescopic unit is retracted, thus completing the single-shell anti-torsion box. 210 extension and locking.

Inactive state: Re-extend the retracted electro-hydraulic push rod 221 and contact the electromagnet 215 on the single-shell anti-torsion box 210, then magnetize the electromagnet 222 and the electromagnet 215, and make them in opposite sex phases. Then, demagnetize the electromagnet 217 under the latch 233, and extend the electro-hydraulic push rod 231 of the locking unit downward, so that the electromagnet 232 on it is in contact with the latch 233, and then the The electromagnet 232 is magnetized, the electro-hydraulic push rod 231 is retracted, the plug 233 is completely brought into the sleeve 208, and the electro-hydraulic push rod 233 is kept firmly sucked by the electromagnet 232; then the electro-hydraulic push rod 221 of the telescopic unit is unlocked and retracted , due to the attraction of opposites, the single-shell anti-torsion box 210 is driven to retract accordingly. After retracting in place, the electro-hydraulic push rod 231 of the locking unit is activated to drive the latch 233 to be inserted downward until the bottom of the latch 233 is in contact with the single-shell. The electromagnet 217 at the outermost end of the anti-torsion box 210 is in contact, then the electromagnet 232 is demagnetized, and the electro-hydraulic push rod 231 is retracted in place. Both the electromagnet 215 and the electromagnet 215 are demagnetized, and the electro-hydraulic push rod 221 is retracted in place and locked.

The above are the preferred embodiments of the present invention, and those of ordinary skill in the art can also carry out various transformations or improvements on this basis. Without departing from the general concept of the present invention, these transformations or improvements should belong to the claimed protection of the present invention. within the range.

Claims (6)

1. A retractable connecting bridge, characterized in that: It includes a double-shell torsion box (200), a single-shell torsion box (210), a telescopic unit, and a locking unit; The cross-sections of the outer surface (201) of the casing and the inner surface (202) of the casing of the double-shell torsion box body (200) are two concentric shapes, and the outer surface (201) and the inner surface (202) of the casing pass through Structural parts are connected as a whole; The cross-section of the shell surface (211) of the single-shell torsion box (210) is the same shape as the cross-section of the inner and outer surfaces of the double-shell torsion box (200), and the interior also has structural components; The double-shell anti-torsion box (200) and the single-shell anti-torsion box (210) each have an oblique root portion and a straight portion; A baffle plate (214) is provided on each side of the oblique root of the single-shell torsion box body (210), and a first electromagnet (215) is installed on the baffle plate; a plurality of baffle plates (215) are arranged inside the single-shell torsion box body (210). Second electromagnets (217), a first sleeve (218) is provided just above each second electromagnet, and slide rails (219) are provided on each inner surface of the straight portion along the length direction, which are connected with the double-shell torsion box. The universal ball chain (209) in the body (200) forms a rolling pair, and the straight part of the single-shell torsion-resistant box body is located in the straight part of the double-shell torsion-resistant box body; the double-shell torsion-resistant box body ( 200) is provided with a second sleeve (208); The telescopic unit comprises a first electro-hydraulic push rod (221), an end of the first electro-hydraulic push rod (221) is provided with a third electromagnet (222), and the third electromagnet (222) is connected to the first electro-hydraulic push rod (221). The iron (215) is aligned; the telescopic unit is used to drive the single-shell anti-torsion box (210) to move relative to the double-shell anti-torsion box (200); When the straight part of the single-shell torsion box (210) is completely inserted into the straight part of the double-shell torsion box (200), the first electromagnet (215) and the third electromagnet (222) on the telescopic unit Keeping the set spacing, the outermost first sleeve (218) is aligned with the second sleeve (208); The locking unit includes a second electro-hydraulic push rod (231) perpendicular to the outer surface of the double-shell torsion-resistant box (200) and corresponding to the position of the second sleeve (208), and a second electro-hydraulic push rod (231) located on the second electro-hydraulic push rod (231) The fourth electromagnet (232) at the end of the first sleeve (233) is located in the first sleeve (218). 2. The telescopic connecting bridge according to claim 1, wherein the double-shell anti-torsion box (200) is provided with a third sleeve (205) at one end of the double-shell torsion-resistant box body (200) close to the inclined root portion of the inner side thereof. The upper and lower ends of the sleeve (205) are provided with rolling bearings (206), the upper end of the inner side of the inclined root is provided with a rotating handle (207), and the third sleeve (205) and its rolling bearing (206) are used to connect the telescopic connection The bridge is connected with the main hull, and the shaft (216) on the single-shell torsion box (210) is used to connect the telescopic connecting bridge with the sheet body. 3 . The retractable connecting bridge according to claim 1 , wherein the first electromagnet, the second electromagnet, the third electromagnet and the fourth electromagnet are electric permanent magnet suction cups. 4 . 4. The telescopic connecting bridge according to claim 1, characterized in that: the height of the oblique root of the double-shell torsion box (200) is not less than 1.5 times the height of the straight part, and the horizontal length of the oblique root is not less than 1.5 times the height of the straight part. 1.5 times the height of the straight part; the spacing between the transverse structural parts (204) in its structural parts is not more than 500mm. 5. The telescopic connecting bridge according to claim 1, characterized in that: the height of the top of the oblique root of the single-shell torsion box (210) is not less than 1.5 times the height of the straight part, and the horizontal length of the oblique root is not less than 1.5 times. It is less than 1.5 times the height of the straight part, and the spacing between the transverse structural parts (213) in the component is not more than 500mm. 6. A working method of a retractable connecting bridge, characterized in that: adopting the retractable connecting bridge described in any one of claims 1-4; In the working state: start the first electro-hydraulic push rod (221) of the telescopic unit, so that the telescopic rod extends outward, when the third electromagnet (222) at its end contacts the first electromagnet (215), Magnetize the third electromagnet (222) and the first electromagnet (215) so that opposites attract each other, and lock the first electro-hydraulic push rod (221); The second electromagnet (217) directly under the first sleeve (218) at the end is demagnetized, the second electro-hydraulic push rod (231) is stretched out, and inserted into the second sleeve (208) to make contact with the plug (233), Magnetize the fourth electromagnet (232), hold the latch (233) firmly, then retract the second electro-hydraulic push rod (231) upwards, take all the latches (233) away from the sleeve (218), and put all the Insert the second sleeve (208), then lock the second electro-hydraulic push rod (231), and keep the fourth electromagnet (232) to continue to hold the latch (233) firmly; then unlock the first electro-hydraulic push rod (221), Make it continue to extend, and as the telescopic rod of the first electro-hydraulic push rod (221) continues to extend, the straight part of the single-shell torsion box (210) is continuously removed from the double-shell torsion box (200). ) and push it out from the straight part of the Extend, and drive the plug (233) to be inserted downward until the bottom of the plug (233) is in contact with the second electromagnet (217) here. Then the fourth electromagnet (232) is demagnetized, the second hydraulic push rod (231) is retracted, the second electromagnet (217) here is magnetized, and the latch (233) is firmly sucked; finally the third electromagnet (222) Both demagnetize the first electromagnet (215), and retract the first electro-hydraulic push rod (221); complete the extension and locking of the single-shell anti-torsion box (210); In the non-working state: extend the retracted first electro-hydraulic push rod (221) again and make contact with the first electromagnet (215), then connect the third electromagnet (222) and the first electromagnet (215) Magnetize, make opposites attract, and lock the first electro-hydraulic push rod (221); then demagnetize the second electro-hydraulic push rod (217) under the latch (233), and demagnetize the second electro-hydraulic push rod (231) Extend downwards so that the fourth electromagnet (232) on it is in contact with the plug (233), then the fourth electromagnet (232) is magnetized, and the second electro-hydraulic push rod (231) is retracted, The latch (233) is completely brought into the second sleeve (208), and the fourth electromagnet (232) is kept firmly sucking the latch (233); then the first electro-hydraulic push rod (221) is unlocked and retracted to drive the single shell The anti-torsion box (210) is retracted accordingly, and after retracting in place, the second electro-hydraulic push rod (231) is activated to drive the latch (233) to be inserted downward until the bottom of the latch (233) is torsion-resistant against the single shell. The second electromagnet (217) at the outermost end of the box body (210) is in contact, then the fourth electromagnet (232) is demagnetized, and the second electro-hydraulic push rod (231) is retracted in place, and the second electromagnet The iron (217) is magnetized, the latch (233) is firmly sucked, the third electromagnet (222) and the first electromagnet (215) are demagnetized, and the first electro-hydraulic push rod (221) is retracted and locked.

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