An extended square cabin dead point folding bottom plate and an extended square cabin

Abstract

The utility model belongs to the technical field of extension square cabin, specifically provides a kind of extension square cabin dead point folding bottom plate and extension square cabin;Extension square cabin dead point folding bottom plate includes first folding plate, second folding plate and first row hinge;First row hinge includes double joint hinge;The double joint hinge includes first connecting leaf piece and first rotating leaf piece and second rotating leaf piece respectively hinged in the two side edges of first connecting leaf piece by first pivot and second pivot;First pivot and second pivot are respectively equipped with first torsional spring and second torsional spring;The two ends of first torsional spring are respectively abutted with first connecting leaf piece and first rotating leaf piece;The two ends of second torsional spring are respectively abutted with first connecting leaf piece and second rotating leaf piece;First folding plate one end is provided with downward protrusion;First connecting leaf piece is fixed in the end face of first folding plate one end with protrusion, and second pivot is located above first pivot;First folding plate is away from first row hinge one end and is hinged with second folding plate by second row hinge.

Description

Technical Field

[0001] This utility model belongs to the field of extended cabin technology, specifically relating to an extended cabin with a folding bottom plate without dead spots and an extended cabin. Background Technology

[0002] An expandable modular container is a type of container that has the same transport dimensions as a standard container when folded up, but significantly increases its usable area when unfolded. It can adapt to various modes of transport, offers good mobility, provides a comfortable internal working environment even in harsh conditions, and possesses multiple protective capabilities. The container itself is a self-supporting independent box and can be used to transport command systems, communications, medical equipment, and logistical support systems.

[0003] Based on the method of expanding the base plate, modular shelters can be divided into two types: pull-out and folding. Existing folding-type expandable shelters have the following main drawbacks: the folding base plates are connected by a long row of hinges, located on the outer sides of the two plates, with the hinge pivots installed near the top, creating a dead point. To ensure the base plate can smoothly arch upwards when the expansion mechanism retracts, an upward pushing device is required. Furthermore, the expansion mechanism needs a free-stroke design to allow the pushing device to act first, lifting the folding plate so that the driving force is positioned below the hinge rotation center, avoiding the dead point. However, the pushing mechanism uses a spring-loaded return lever, which is prone to failure after long-term use. Utility Model Content

[0004] The purpose of this invention is to overcome the problem in the prior art that the folding bottom plate easily forms a hinge dead point, requiring a pushing device, which affects the long-term use effect.

[0005] To address this, the present invention provides an extended modular shelter with a folding bottom plate without dead spots, comprising a first folding plate, a second folding plate, and a first row of hinges; the first row of hinges includes double-jointed hinges; the double-jointed hinges include a first connecting leaf and a first rotating leaf and a second rotating leaf respectively hinged to the two sides of the first connecting leaf via a first rotating shaft and a second rotating shaft; a first torsion spring and a second torsion spring are respectively sleeved on the first rotating shaft and the second rotating shaft; the two ends of the first torsion spring abut against the first connecting leaf and the first rotating leaf respectively; the two ends of the second torsion spring abut against the first connecting leaf and the second rotating leaf respectively; one end of the first folding plate has a downward protrusion; the first connecting leaf is fixed to the end face of the first folding plate with the protrusion, and the second rotating shaft is located above the first rotating shaft; the end of the first folding plate away from the first row of hinges is hinged to the second folding plate via the second row of hinges.

[0006] Specifically, the angle between the line connecting the hinge point of the first rotating blade and the first connecting blade and the hinge point of the first folding plate and the second row of hinges and the plane is not less than 3°.

[0007] Specifically, the first row of hinges includes multiple double-jointed hinges arranged at intervals; adjacent double-jointed hinges are connected by double-jointed hinges; the double-jointed hinge includes a second connecting leaf and a third rotating leaf and a fourth rotating leaf respectively hinged to the two sides of the second connecting leaf via a third rotating shaft and a fourth rotating shaft; the third rotating shaft and the fourth rotating shaft are respectively connected to the first rotating shaft and the second rotating shaft of the adjacent double-jointed hinge.

[0008] Specifically, the second folding plate has an inclined surface at one end; the second row of hinges includes a third connecting plate, a fifth rotating plate, and a sixth rotating plate; one side of the third connecting plate is hinged to the fifth rotating plate via a fifth pivot, and the other side is hinged to the sixth rotating plate via a sixth pivot; the sixth rotating plate is installed in the opposite direction; the sixth rotating plate is fixed to the inclined surface of the second folding plate, and the sixth pivot is in contact with the top edge of the inclined surface; the fifth rotating plate is fixed to the end face of the first folding plate, and the fifth pivot is in contact with the top edge of the end face of the first folding plate.

[0009] Specifically, the slope angle of the second folding plate is 23°-24°.

[0010] Specifically, the width of the third connecting leaf is greater than the thickness of the first folding plate.

[0011] This utility model also provides an expandable cabin, including an expandable cabin, a main cabin, and a foldable bottom plate of the expandable cabin without dead spots; the end of the second foldable plate away from the first foldable plate is hinged to the first fixed bottom plate of the main cabin; a stepped boss is provided at one end of the second fixed bottom plate of the expandable cabin; a first rotating blade is fixed to the top surface of the stepped boss; and a second rotating blade overlaps the edge of the second fixed bottom plate of the expandable cabin.

[0012] Specifically, the width of the second rotating blade is greater than the horizontal distance between the first rotating shaft and the edge of the second fixed base plate of the expansion compartment.

[0013] Specifically, the second folding plate is hinged to the first fixed base plate of the main cabin via a third row of hinges; the third row of hinges includes a seventh rotating blade and an eighth rotating blade; the side of the seventh rotating blade is hinged to the side of the eighth rotating blade via a seventh pivot; the seventh rotating blade is fixed to the end face of the second folding plate; the eighth rotating blade is fixed to one end face of the first fixed base plate of the main cabin; the seventh pivot is in contact with the top edge of the end face of the second folding plate and the top edge of the end face of the first fixed base plate of the main cabin.

[0014] Specifically, the aforementioned extended cabin also includes an extension mechanism; the extension mechanism is fixed to the bottom of the main cabin; the telescopic end of the extension mechanism is connected to the extended cabin. The extension mechanism is used to extend or retract the extended cabin.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The extended modular cabin's dead-point-free folding bottom plate provided by this utility model optimizes the design of the extended modular cabin's bottom plate, adjusts the hinge connection between the extended plate and the fixed bottom plate, and changes the bottom plate connection structure. Through the downward protrusion of the side beam, the driving force direction of the extended cabin can form an angle with the horizontal plane. With the help of the double-section hinge structure, the dead-point problem that usually occurs when the folding bottom plate of the extended modular cabin is extended is solved. The bottom plate can be flipped upward without the use of a jacking device, which simplifies the structure and improves the reliability of the folding bottom plate.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the extended modular cabin's bottom plate in an extended state with no dead spots, as implemented in one embodiment.

[0019] Figure 2 yes Figure 1 Enlarged view of area A in the middle.

[0020] Figure 3 yes Figure 1 Enlarged view of area B in the middle.

[0021] Figure 4 This is a schematic diagram of the structure of an extended modular cabin in a retracted state with a folded bottom plate without dead spots, according to one implementation method.

[0022] Figure 5 This is a schematic diagram of the connection between the first folding plate and the expansion compartment in one embodiment.

[0023] Figure 6 This is a schematic diagram showing the comparison of two turning points on the bottom plate of the extended modular container in the extended state without dead spots, in one implementation method.

[0024] Figure 7 This is a top view of the extended modular container's folding bottom plate in one implementation method.

[0025] Figure 8 This is a side view of the first row of hinges in one implementation method.

[0026] Figure 9 This is a second-row hinged side view in one implementation method.

[0027] Figure 10 This is a schematic diagram of the front of the extended modular cabin in one implementation method.

[0028] Figure 11 This is a schematic diagram of the side of an extended modular container in one implementation method.

[0029] Figure 12 This is a schematic diagram illustrating the single-sided expansion and single-sided contraction state of an expanded modular cabin in one implementation method.

[0030] Figure 13 This is a schematic diagram of the connection structure between the extended modular cabin's folding bottom plate and the main cabin's first fixed bottom plate in one implementation method.

[0031] Explanation of reference numerals in the attached drawings: 100, First folding plate; 101, Protrusion; 200, First row of hinges; 210, Double-jointed hinge; 211, First rotating leaf; 212, First pivot; 213, First connecting leaf; 214, Second pivot; 215, Second rotating leaf; 220, Double-jointed hinge; 300, Second folding plate; 301, Inclined surface; 400, Second row of hinges; 401, Fifth rotating leaf; 402, Fifth pivot; 403, Third connecting leaf; 404, Sixth pivot; 405, Sixth rotating leaf; 500, Extension compartment; 501, Second fixed base plate; 502, Stepped boss; 600, Main compartment; 601, First fixed base plate; 700, Third row of hinges; 701, Seventh rotating leaf; 702, Seventh pivot; 703, Eighth rotating leaf; 800, Extension mechanism. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] Reference Figure 1-6This utility model provides an extended container with a folding bottom plate without dead spots, including a first folding plate 100, a second folding plate 300, and a first row of hinges 200; the first row of hinges 200 includes a double-jointed hinge 210; the double-jointed hinge 210 includes a first connecting leaf 213 and a first rotating leaf 211 and a second rotating leaf 215 respectively hinged to the two sides of the first connecting leaf 213 via a first rotating shaft 212 and a second rotating shaft 214; a first torsion spring and a second torsion spring are respectively sleeved on the first rotating shaft 212 and the second rotating shaft 214; The two ends of a torsion spring abut against the first connecting plate 213 and the first rotating plate 211, respectively; the two ends of a second torsion spring abut against the first connecting plate 213 and the second rotating plate 215, respectively; one end of the first folding plate 100 is provided with a downward protrusion 101; the first connecting plate 213 is fixed to the end face of the first folding plate 100 at the end with the protrusion 101, and the second rotating shaft 214 is located above the first rotating shaft 212; the end of the first folding plate 100 away from the first row of hinges 200 is hinged to the second folding plate 300 through the second row of hinges 400.

[0036] In use, a stepped boss 502 is provided at one end of the second fixed base plate 501 of the expansion cabin 500, making its cross-section L-shaped. The first rotating blade 211 is fixed to the top surface of the stepped boss 502, allowing the first folding plate 100 to rotate relative to the stepped boss 502 via the first rotating shaft 212. The second rotating blade 215 overlaps the edge of the second fixed base plate 501 of the expansion cabin 500. When the dead-spot-free folding base plate of the expansion cabin is in the extended state, the two turning points of the dead-spot-free folding base plate are respectively as follows: Figure 2-3 As shown, the first folding plate 100 protrusion 101 is attached to the top surface of the stepped boss 502, and the second rotating blade 215 is horizontally overlapped on the top surface of the second fixed base plate 501 of the expansion compartment 500, obscuring the stepped boss 502. Figure 6 As shown, because the first folding plate 100 has a downward protrusion 101, its left and right rotating shafts form an angle with the horizontal plane, allowing the driving force direction of the extension cabin 500 to form an angle of elevation with the horizontal plane. This solves the dead point problem that usually occurs when the folding bottom plate of the extension cabin is extended, and the bottom plate can be flipped upward without the use of a jacking device, simplifying the structure and improving the reliability of the folding bottom plate. When the dead-point-free folding bottom plate of the extension cabin is retracted, as... Figure 4-5 As shown, the left side of the first folding plate 100 rotates around the first rotating shaft 212 located below, and the second rotating blade 215 rotates close to the edge of the fixed base plate under the tightening force of the second torsion spring, which serves to shield the stepped boss 502 and at the same time ensure that the blade does not shake during transportation.

[0037] The first connecting plate 213, the first rotating plate 211, and the second rotating plate 215 are determined according to the thickness of the first folding plate 100 and the protrusion 101, the horizontal distance between the end of the first folding plate 100 and the edge of the second fixed base plate 501 of the expansion compartment 500, and the height difference between the edge of the second fixed base plate 501 of the expansion compartment 500 and the stepped protrusion 502 during actual manufacturing.

[0038] Specifically, the angle between the line connecting the hinge point of the first rotating blade 211 and the first connecting blade 213 and the hinge point of the first folding plate and the second row of hinges 400 and the plane is not less than 3°. This ensures smooth force transmission during the retraction process.

[0039] In one optimized embodiment, the first row of hinges 200 includes multiple spaced-apart double-jointed hinges 210; adjacent double-jointed hinges 210 are connected by double-jointed hinges 220; each double-jointed hinge 220 includes a second connecting leaf and a third rotating leaf and a fourth rotating leaf respectively hinged to the two sides of the second connecting leaf via a third pivot and a fourth pivot; the third pivot and the fourth pivot are respectively connected to a first pivot 212 and a second pivot 214 of the adjacent double-jointed hinges 210. (Refer to...) Figure 7-8 The double-jointed hinge 210 and double-jointed hinge 220 are connected sequentially at intervals along the length of the first row of hinges 200. To ensure rotational stability, the only difference between the double-jointed hinge 220 and the double-jointed hinge 210 is that a torsion spring is not used. That is, the second connecting leaf is the same size as the first connecting leaf 213, the third rotating leaf is the same size as the first rotating leaf 211, and the fourth rotating leaf is the same size as the second connecting leaf. The third pivot and the first pivot 212 can be an integral pivot, and the fourth pivot and the second pivot 214 can be an integral pivot, so that the first row of hinges 200 has a rectangular structure in the extended state.

[0040] In a detailed embodiment, the second folding plate 300 has an inclined surface 301 at one end; see reference Figure 9 The second row of hinges 400 includes a third connecting plate 403, a fifth rotating plate 401, and a sixth rotating plate 405. One side of the third connecting plate 403 is hinged to the fifth rotating plate 401 via a fifth pivot 402, and the other side is hinged to the sixth rotating plate 405 via a sixth pivot 404. The sixth rotating plate 405 is installed in the opposite direction. The sixth rotating plate 405 is fixed to the inclined surface 301 of the second folding plate 300, and the sixth pivot 404 is in contact with the top edge of the inclined surface 301. The fifth rotating plate 401 is fixed to the end face of the first folding plate 100, and the fifth pivot 402 is in contact with the top edge of the end face of the first folding plate 100. Figure 3-4 As shown, when the plates are closed, the third connecting plate 403 and the fifth rotating plate 401 gradually approach each other, and the sixth rotating plate 405 gradually approaches the bottom surface of the first folding plate 100, causing the first folding plate 100 and the second folding plate 300 to fold together.

[0041] Preferably, the inclined surface 301 of the second folding plate 300 has an inclination angle of 23°-24°, so as to ensure that the angle formed by the first folding plate 100 and the second folding plate 300 after folding is about 20°.

[0042] Furthermore, the width of the third connecting leaf 403 is greater than the thickness of the first folding plate 100 to prevent the lower edge of the first folding plate 100 from interfering with the contact between the sixth rotating leaf 405 and the bottom surface of the first folding plate 100 when the leaf is closed.

[0043] Specifically, the first row of hinges 200 can be connected to the first folding plate 100 and the stepped boss 502 by screws or other feasible methods; the second row of hinges 400 can be connected to the first folding plate 100 and the second folding plate 300 by screws or other feasible methods.

[0044] Reference Figure 10-13 This utility model also provides an expandable cabin, including an expandable cabin 500, a main cabin 600, and the aforementioned expandable cabin's dead-spot-free folding base plate; the second folding plate 300, at the end away from the first folding plate 100, is hinged to the first fixed base plate 601 of the main cabin 600; one end of the second fixed base plate 501 of the expandable cabin 500 is provided with a stepped boss 502; a first rotating blade 211 is fixed to the top surface of the stepped boss 502, allowing the first folding plate 100 to rotate relative to the stepped boss 502 via a first rotating shaft 212; a second rotating blade 215 overlaps the edge of the second fixed base plate 501 of the expandable cabin 500. The first fixed base plate 601 of the main cabin 600 is mounted on the cabin's fixed base frame and does not move during expansion. Before expansion, the expandable cabin's dead-spot-free folding base plate is in a position... Figure 4 As shown in the folded state, to use the extended cabin, push the extended cabin to extend its bottom plate without any dead spots, and then push out the extended cabin 500. The top of the extended cabin 500 can be a pull-out flat panel, such as... Figure 12 As shown, the extended cabin 500 can be directly and horizontally retracted into the main cabin 600. Alternatively, a folding base plate without dead spots can be used, with the folding direction opposite to that of the bottom extended cabin folding base plate, allowing it to fold downwards. The number of extended cabins 500 can be set on the corresponding side of the main cabin 600 as needed. The first fixed base plate 601 is installed on the fixed base frame of the cabin and does not move during expansion.

[0045] Specifically, the width of the second rotating blade 215 is greater than the horizontal distance between the first rotating shaft 212 and the edge of the second fixed base plate 501 of the expansion compartment 500, ensuring that the second rotating blade 215 can overlap the upper surface of the second fixed base plate 501 of the expansion compartment 500 during both extension and retraction. When folded, the second rotating blade 215 can be tightly attached to the edge of the second fixed base plate 501 of the expansion compartment 500 to bear the force.

[0046] In a detailed embodiment, the second folding plate 300 is hinged to the first fixed base plate 601 of the main cabin 600 via a third row of hinges 700. The third row of hinges 700 includes a seventh rotating blade 701 and an eighth rotating blade 703. The side of the seventh rotating blade 701 is hinged to the side of the eighth rotating blade 703 via a seventh pivot 702. The seventh rotating blade 701 is fixed to the end face of the second folding plate 300, and the eighth rotating blade 703 is fixed to one end face of the first fixed base plate 601 of the main cabin 600. The seventh pivot 702 is in contact with the top edge of the end face of the second folding plate 300 and the top edge of the end face of the first fixed base plate 601 of the main cabin 600. When retracted, the second folding plate 300 rotates around the seventh pivot 702, and the angle between the seventh rotating blade 701 and the eighth rotating blade 703 gradually increases.

[0047] Furthermore, it also includes an extension mechanism 800; the extension mechanism 800 is fixed to the bottom of the main cabin 600; the telescopic end of the extension mechanism 800 is connected to the extension cabin 500. The extension mechanism 800 pushes the extension cabin 500 to extend or retract.

[0048] Example 1:

[0049] This embodiment provides an extended modular shelter with a folding bottom plate without dead spots, including a first folding plate 100, a second folding plate 300, a first row of hinges 200, and a second row of hinges 400;

[0050] The first folding plate 100 and the second folding plate 300 are general-purpose modular panels, which are composed of a rectangular metal frame, a polyurethane foam core, and inner and outer aluminum skin. The rectangular metal frame can be made of steel pipe, aluminum pipe or fiberglass pipe.

[0051] The first row of hinges 200 is composed of three sections of double-joint hinges 210 and two sections of double-joint hinges 220, which are alternately welded together. Both the double-joint hinges 210 and the double-joint hinges 220 are made of stainless steel.

[0052] The double-joint hinge 210 includes a first connecting leaf 213 and a first rotating leaf 211 and a second rotating leaf 215, which are respectively hinged to the two sides of the first connecting leaf 213 via a first rotating shaft 212 and a second rotating shaft 214. A first torsion spring and a second torsion spring are respectively sleeved on the first rotating shaft 212 and the second rotating shaft 214. The two ends of the first torsion spring abut against the first connecting leaf 213 and the first rotating leaf 211, respectively. The two ends of the second torsion spring abut against the first connecting leaf 213 and the second rotating leaf 215, respectively. The width of the first rotating leaf 211 is 36mm, the width of the first connecting leaf 213 is 42mm, and the width of the second rotating leaf 215 is 76mm.

[0053] The double-joint hinge 220 includes a second connecting leaf and a third rotating leaf and a fourth rotating leaf, which are respectively hinged to the two sides of the second connecting leaf via a third rotating shaft and a fourth rotating shaft. The two ends of the third rotating shaft are respectively connected to the first rotating shaft 212 of the adjacent double-joint hinge 210, and the two ends of the fourth rotating shaft are respectively connected to the second rotating shaft 214 of the adjacent double-joint hinge 210. The only difference between the double-joint hinge 220 and the double-joint hinge 210 is that it does not use a torsion spring. The second connecting leaf and the first connecting leaf 213, the third rotating leaf and the first rotating leaf 211, and the fourth rotating leaf and the second connecting leaf are the same size. The first rotating leaf 211, the second rotating leaf 215, the third rotating leaf, and the fourth rotating leaf are all provided with multiple countersunk holes.

[0054] The left side beam of the first folding plate 100 has a protrusion 101 extending downward by 10mm; the first connecting plate 213 is fixed to the end face (left side) of the first folding plate 100 with the protrusion 101 by screws and corresponding countersunk holes, and the second rotating shaft 214 is located above the first rotating shaft 212.

[0055] The left side of the second folding plate 300 is a 24° inclined plane 301; the second row of hinges 400 includes a third connecting plate 403, a fifth rotating plate 401, and a sixth rotating plate 405; the fifth rotating plate 401 has a width of 36mm, the third connecting plate 403 has a width of 42mm, and the sixth rotating plate 405 has a width of 36mm; one side of the third connecting plate 403 is hinged to the fifth rotating plate 401 via a fifth pivot 402, and the other side is hinged to the sixth rotating plate 405 via a sixth pivot 404; the sixth rotating plate 405 is installed in the opposite direction; multiple countersunk holes are provided on both the fifth rotating plate 401 and the sixth rotating plate 405;

[0056] The sixth rotating blade 405 is fixed to the inclined surface 301 of the second folding plate 300 by screws and corresponding countersunk holes, and the sixth rotating shaft 404 is in contact with the top edge of the inclined surface 301; the fifth rotating blade 401 is fixed to the right side of the first folding plate 100 by screws and corresponding countersunk holes, and the fifth rotating shaft 402 is in contact with the top edge of the right side of the first folding plate 100; the width of the third connecting blade 403 is greater than the thickness of the first folding plate 100;

[0057] This utility model also provides an expandable cabin, including an expandable cabin 500, a main cabin 600, an expandable mechanism 800, and the aforementioned expandable cabin's dead-point folding bottom plate;

[0058] The second fixed base plate 501 of the expansion compartment 500 is composed of a rectangular steel tube frame, polyurethane foam, and inner and outer aluminum skin. A stepped boss 502 is provided at one end of the second fixed base plate 501 of the expansion compartment 500, so that its cross section is L-shaped, with a step length of 80mm and a height of 50mm, for fixing the first folding plate 100.

[0059] The first rotating blade 211 is fixed to the top surface of the stepped boss 502 by screws and corresponding countersunk holes, so that the first folding plate 100 can rotate relative to the stepped boss 502 through the first rotating shaft 212; the second rotating blade 215 overlaps the edge of the second fixed base plate 501 of the expansion compartment 500; the width of the second rotating blade 215 is greater than the horizontal distance between the first rotating shaft 212 and the edge of the second fixed base plate 501 of the expansion compartment 500.

[0060] The first fixed base plate 601 of the main cabin 600 is a general-purpose container large plate, which is composed of a rectangular metal frame, a polyurethane foam core, and inner and outer aluminum skin. The rectangular metal frame can be made of steel pipe, aluminum pipe or fiberglass pipe.

[0061] The right end of the second folding plate 300 is hinged to the first fixed bottom plate 601 of the main cabin 600 via the third row of hinges 700.

[0062] The third row of hinges 700 includes a seventh rotating blade 701 and an eighth rotating blade 703; the right side of the seventh rotating blade 701 is hinged to the left side of the eighth rotating blade 703 via a seventh pivot 702; both the seventh rotating blade 701 and the eighth rotating blade 703 have multiple countersunk holes.

[0063] The seventh rotating blade 701 is fixed to the right side of the second folding plate 300 by screws and corresponding countersunk holes, and the eighth rotating blade 703 is fixed to the left side of the first fixed base plate 601 of the main cabin 600. The seventh rotating shaft 702 is in contact with the top edge of the right side of the second folding plate 300 and the top edge of the left side of the first fixed base plate 601 of the main cabin 600.

[0064] The thickness of each sheet shall not be less than 2mm;

[0065] The extension mechanism 800 is fixed to the bottom of the main cabin 600; the telescopic end of the extension mechanism 800 is connected to the extension cabin 500.

[0066] When the extension compartment 500 extends beyond the main compartment 600, the dead-point-free folding bottom plate of the extension compartment is in an extended state. The protrusion 101 of the first folding plate 100 is in contact with the top surface of the stepped boss 502, and the second rotating blade 215 is horizontally overlapped on the top surface of the second fixed bottom plate 501 of the extension compartment 500, blocking the stepped boss 502. Because the first folding plate 100 has a downward protrusion 101, its left and right rotating shafts form an angle with the horizontal plane, so that the driving force direction of the extension compartment 500 can form an angle of elevation with the horizontal plane. This solves the dead-point problem that usually occurs when the folding bottom plate of the extension compartment is extended. The upward flipping of the bottom plate can be achieved without the use of a jacking device, which simplifies the structure and improves the reliability of the folding bottom plate. When the extended compartment 500 is retracted into the main compartment 600, the folding bottom plate of the extended compartment is in a retracted state. The left side of the first folding plate 100 rotates around the first pivot 212 located below. The second rotating blade 215 rotates tightly against the edge of the fixed bottom plate under the tension of the second torsion spring, which serves to shield the stepped protrusion 502 and ensure that the blade does not shake during transportation. The third connecting blade 403 and the fifth rotating blade 401 gradually approach each other, the sixth rotating blade 405 gradually approaches the bottom surface of the first folding plate 100, and the angle between the seventh rotating blade 701 and the eighth rotating blade 703 gradually increases, causing the first folding plate 100 and the second folding plate 300 to fold.

[0067] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A folding bottom plate for an extended modular shelter without dead spots, characterized in that: It includes a first folding plate (100), a second folding plate (300), and a first row of hinges (200); the first row of hinges (200) includes a double-jointed hinge (210); the double-jointed hinge (210) includes a first connecting leaf (213) and a first rotating leaf (211) and a second rotating leaf (215) respectively hinged to the two sides of the first connecting leaf (213) via a first rotating shaft (212) and a second rotating shaft (214); a first torsion spring and a second torsion spring are respectively sleeved on the first rotating shaft (212) and the second rotating shaft (214); the two ends of the first torsion spring are respectively connected to the first The connecting plate (213) and the first rotating plate (211) abut against each other; the two ends of the second torsion spring abut against the first connecting plate (213) and the second rotating plate (215) respectively; one end of the first folding plate (100) is provided with a downward protrusion (101); the first connecting plate (213) is fixed to the end face of the first folding plate (100) with the protrusion (101), and the second rotating shaft (214) is located above the first rotating shaft (212); the end of the first folding plate (100) away from the first row of hinges (200) is hinged to the second folding plate (300) through the second row of hinges (400).

2. The extended modular container with a folding bottom plate without dead spots as described in claim 1, characterized in that: The angle between the line connecting the hinge point of the first rotating blade (211) and the hinge point of the first folding plate and the second row of hinges (400) and the plane is not less than 3°.

3. The extended modular container with a folding bottom plate without dead spots as described in claim 1, characterized in that: The first row of hinges (200) includes multiple double-joint hinges (210) arranged at intervals; adjacent double-joint hinges (210) are connected by double-joint hinges (220); the double-joint hinges (220) include a second connecting leaf and a third rotating leaf and a fourth rotating leaf respectively hinged to the two sides of the second connecting leaf via a third rotating shaft and a fourth rotating shaft; the third rotating shaft and the fourth rotating shaft are respectively connected to the first rotating shaft (212) and the second rotating shaft (214) of the adjacent double-joint hinges (210).

4. The extended modular container with a folding bottom plate without dead spots as described in claim 1, characterized in that: The second folding plate (300) has an inclined surface (301) at one end; the second row of hinges (400) includes a third connecting plate (403), a fifth rotating plate (401) and a sixth rotating plate (405); one side of the third connecting plate (403) is hinged to the fifth rotating plate (401) through a fifth pivot (402), and the other side is hinged to the sixth rotating plate (405) through a sixth pivot (404); the sixth rotating plate (405) is installed in the opposite direction; the sixth rotating plate (405) is fixed to the inclined surface (301) of the second folding plate (300), and the sixth pivot (404) is in contact with the top edge of the inclined surface (301); the fifth rotating plate (401) is fixed to the end face of the first folding plate (100), and the fifth pivot (402) is in contact with the top edge of the end face of the first folding plate (100).

5. The extended modular container with a folding bottom plate without dead spots as described in claim 4, characterized in that: The angle of the inclined surface (301) of the second folding plate (300) is 23°-24°.

6. The extended modular container with a folding bottom plate without dead spots as described in claim 4, characterized in that: The width of the third connecting leaf (403) is greater than the thickness of the first folding plate (100).

7. An expandable modular shelter, characterized in that: It includes an extension compartment (500), a main compartment (600), and a folding bottom plate without dead spots as described in any one of claims 1-6; the second folding plate (300) is hinged to the first fixed bottom plate (601) of the main compartment (600) at the end away from the first folding plate (100); a stepped boss (502) is provided at one end of the second fixed bottom plate (501) of the extension compartment (500); a first rotating blade (211) is fixed on the top surface of the stepped boss (502); and a second rotating blade (215) overlaps the edge of the second fixed bottom plate (501) of the extension compartment (500).

8. The extended modular housing as described in claim 7, characterized in that: The width of the second rotating blade (215) is greater than the horizontal distance between the first rotating shaft (212) and the edge of the second fixed base plate (501) of the expansion compartment (500).

9. The extended modular container as described in claim 7, characterized in that: The second folding plate (300) is hinged to the first fixed base plate (601) of the main cabin (600) via a third row of hinges (700); the third row of hinges (700) includes a seventh rotating blade (701) and an eighth rotating blade (703); the side of the seventh rotating blade (701) is hinged to the side of the eighth rotating blade (703) via a seventh pivot (702); the seventh rotating blade (701) is fixed to the end face of the second folding plate (300); the eighth rotating blade (703) is fixed to one end face of the first fixed base plate (601) of the main cabin (600); the seventh pivot (702) is in contact with the top edge of the end face of the second folding plate (300) and the top edge of the end face of the first fixed base plate (601) of the main cabin (600).

10. The extended modular container as described in claim 7, characterized in that: It also includes an extension mechanism (800); the extension mechanism (800) is fixed to the bottom of the main cabin (600); the telescopic end of the extension mechanism (800) is connected to the extension cabin (500), and the extension cabin (500) is pushed to extend or retract through the extension mechanism (800).

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