Two-stage expansion square cabin with large expansion space

Abstract

The invention discloses a two-stage expansion square cabin with a large expansion space, belongs to the field of special vehicle-mounted square cabins, and relates to a manually expandable two-stage expansion square cabin which comprises a fixed cabin and expansion cabins symmetrically mounted on two sides of the fixed cabin. The expansion cabin is of a two-stage expansion structure and comprises a first-stage expansion cabin body, a transition frame, a second-stage expansion cabin body, an expansion mechanism and a telescopic transmission mechanism. The first-stage expansion cabin body and the second-stage expansion cabin body are sequentially and coaxially installed through the transition frame, can be expanded and folded, and form a two-stage expansion cabin when being unfolded together. And the first expansion mechanism and the second expansion mechanism are respectively used for manually expanding and folding the first-stage expansion cabin body and the second-stage expansion cabin body. The telescopic transmission mechanism is installed at the bottom of the expansion cabin and supports telescopic translation of the transition frame and the second-stage expansion cabin body. The two-stage expansion structure effectively increases the expansion area of the square cabin, the manual expansion driving structure is simple, operation is convenient, the failure rate is low, expansion and folding of the square cabin can be rapidly achieved, and the environment applicability is high.

Description

Technical Field

[0001] The invention belongs to the field of special vehicle-mounted shelters, and in particular relates to a double-stage expansion shelter with a large expansion space. Background Art

[0002] The vehicle-mounted shelter is installed on a special vehicle to provide mobile living, office, transportation and other functional spaces. Existing vehicle-mounted shelters are divided into conventional shelters and extended shelters. Conventional shelters are hexahedral box-type structures with a single form and poor mobility. The use space of the shelter is fixed and limited, which limits the size of the equipment installed in the shelter and the number of passengers. Therefore, it can no longer meet the requirements of personnel equipment, equipment transportation and space operations, and extended shelters came into being.

[0003] The expansion cabin has the characteristic of expandable space, and generally has a fixed cabin part and an expansion cabin part. The expansion cabin can be divided into a pull-out expansion cabin and a flip-type expansion cabin according to different expansion methods. The pull-out expansion cabin consists of a fixed main cabin, an expansion cabin and a drive system. Its expansion cabin is a fixed pentahedral structure, and the expansion and contraction are achieved through the drive system at the bottom. The expansion part of the flip-type expansion cabin is achieved through multi-plate linkage, which is completed by the expansion top plate, the expansion bottom plate, the upper side plate and the lower side plate, and the expansion end plate, and is driven by the drive system. Both expansion methods require an electric drive system to achieve expansion. On the one hand, the drive system has a complex structure and high production and manufacturing costs; on the other hand, the maneuverability is poor in complex and changeable field working environments. For example, when the drive system fails or the drive system is out of power in extreme environments, the expansion operation cannot be carried out. At the same time, the existing expansion cabins are basically one-level expansions, and the expansion space is limited. Summary of the invention

[0004] Technical issues to be solved:

[0005] In order to avoid the shortcomings of the prior art, the present invention provides a double-stage expandable cabin with a large expansion space, which is a manually expandable double-stage expandable cabin. The double-stage expansion can increase the expansion area of ​​the cabin, and the manual expansion drive method avoids the complex structure and poor maneuverability caused by the use of a drive system, and the problem of being unable to unfold in extreme outdoor environments.

[0006] The technical solution of the present invention is: a double-stage expansion cabin with a large expansion space, comprising a fixed cabin and expansion cabins symmetrically installed on both sides of the fixed cabin, the expansion cabin is a double-stage expansion structure, including a primary expansion cabin body, a transition frame, a secondary expansion cabin body, an expansion mechanism and a telescopic transmission mechanism;

[0007] The first-stage expansion cabin, transition frame and second-stage expansion cabin are sequentially coaxially mounted and connected, and one end of the first-stage expansion cabin away from the transition frame is mounted and connected to the fixed cabin; the first-stage expansion cabin and the second-stage expansion cabin are expandable and retractable along the installation axis, and form a double-stage expansion cabin when they are deployed together; the transition frame is used to connect the first-stage expansion cabin and the second-stage expansion cabin;

[0008] The expansion mechanism includes a first expansion mechanism and a second expansion mechanism, which are respectively used for manual expansion and retraction of the primary expansion cabin and the secondary expansion cabin; the telescopic transmission mechanism is installed at the bottom of the expansion cabin, and is used to support the telescopic translation of the transition frame and the secondary expansion cabin.

[0009] A further technical solution of the present invention is: the transition frame is a rectangular frame plate structure, the rectangular frame formed by it is parallel to the fixed cabin, and includes two vertical plates, an upper frame plate and a lower frame plate; the two vertical plates are vertically and parallelly arranged; the upper frame plate connects the tops of the two vertical plates; the lower frame plate connects the bottoms of the two vertical plates; the lower end surface of the lower frame plate is fixedly connected to the telescopic rod of the telescopic transmission mechanism.

[0010] A further technical solution of the present invention is: the first-level expansion cabin includes a first top plate, a first bottom plate and a first end plate; one end of the first top plate is horizontally hinged to the upper end of the fixed cabin, and is used to flip upward to form the cabin top plate of the first-level expansion cabin in the expanded state; one end of the first bottom plate is horizontally hinged to the side of the lower frame plate facing the fixed cabin, and is used to flip downward to form the cabin bottom plate of the first-level expansion cabin in the expanded state; two of the first end plates are symmetrically or parallelly staggeredly installed at the front and rear ends of the side of the fixed cabin, and are vertically hinged to the fixed cabin respectively, and are used to flip 90° to the outside of the fixed cabin to form the front end plate and rear end plate of the first-level expansion cabin in the expanded state.

[0011] A further technical solution of the present invention is: there are two groups of the first expansion mechanism, which are symmetrically installed at both ends of the first-level expansion cabin; each group of the first expansion mechanism includes a first connecting rod, a second connecting rod, a first pulley, a second pulley and a first steel wire rope; one end of the first connecting rod is hinged to the upper frame plate, and the other end is hinged to the middle part of the side wall of the first top plate; one end of the second connecting rod is hinged to the bottom end of the fixed cabin, and the other end is hinged to the middle part of the side wall of the first bottom plate; the first pulley is fixedly installed on the top of the fixed cabin, and the second pulley is fixedly installed on the end of the side wall of the first top plate away from its hinged end; one end of the first steel wire rope is fixed to the upper frame plate, and the other end thereof is successively wrapped around the second pulley and the first pulley and fixedly connected to the end of the first bottom plate away from its hinged end; the first connecting rod and the second connecting rod are coplanar, and the first pulley, the second pulley and the first steel wire rope are coplanar.

[0012] A further technical solution of the present invention is: the first steel wire rope is arranged in an S shape and is wound around the lower side of the second pulley and the upper side of the first pulley.

[0013] A further technical solution of the present invention is: the secondary expansion cabin body includes a second top plate, a second bottom plate, a second end plate and an outer plate; one end of the second top plate is horizontally hinged to the side of the upper frame plate facing away from the fixed cabin, and is used to flip upward to form the cabin top plate of the secondary expansion cabin body in the expanded state; one end of the second bottom plate is horizontally hinged to the bottom of the outer plate, and is used to flip downward to form the cabin bottom plate of the secondary expansion cabin body in the expanded state; two of the second end plates are symmetrically installed in the frame of the transition frame, and are vertically hinged to the inner side walls of the two vertical plates respectively, and are used to flip 90° to the outside of the transition frame to form the front end plate and the rear end plate of the secondary expansion cabin body in the expanded state; the outer plate is arranged parallel to the transition frame.

[0014] A further technical solution of the present invention is: the second expansion mechanism has the same structure as the first expansion mechanism, and there are two groups of second expansion mechanisms, which are symmetrically installed at both ends of the secondary expansion cabin; each group of second expansion mechanisms includes a third connecting rod, a fourth connecting rod, a third pulley, a fourth pulley and a second steel wire rope; one end of the third connecting rod is hinged to the upper end of the outer plate, and the other end is hinged to the middle part of the side wall of the second top plate; one end of the fourth connecting rod is hinged to the lower frame plate, and the other end is hinged to the middle part of the side wall of the second bottom plate; the third pulley is fixedly installed on the upper frame plate, and the fourth pulley is fixedly installed on the end of the side wall of the second top plate away from its hinged end; one end of the second steel wire rope is fixed to the upper end of the outer plate, and the other end thereof is successively wrapped around the fourth pulley and the third pulley and fixedly connected to the end of the second bottom plate away from its hinged end; the third connecting rod and the fourth connecting rod are coplanar, and the third pulley, the fourth pulley and the second steel wire rope are coplanar.

[0015] A further technical solution of the present invention is: the second steel wire rope is arranged in an S shape and is wound around the lower side of the fourth pulley and the upper side of the third pulley.

[0016] A further technical solution of the present invention is: the telescopic transmission mechanism includes a fixed end, a first-stage telescopic rod and a second-stage telescopic rod; the fixed end is installed on the bottom plate of the fixed cabin, and the first-stage telescopic rod is coaxially and telescopically embedded in the inner cavity of the fixed end; the second-stage telescopic rod is coaxially and telescopically embedded in the first-stage telescopic rod; the extended end of the first-stage telescopic rod is fixedly connected to the lower end surface of the lower frame plate, and the extended end of the second-stage telescopic rod is fixedly connected to the bottom surface of the outer plate.

[0017] A further technical solution of the present invention is that a buckle is installed on the outer side wall of the vertical plate for locking the secondary expansion cabin when it is in a retracted state, and locking tongues cooperating with the buckle are provided on both sides of the outer side plate.

[0018] Beneficial Effects

[0019] The beneficial effects of the present invention are as follows: the present invention provides a double-stage expansion cabin with a large expansion space, and the first top plate and the first bottom plate of the first-stage expansion cabin body are flipped and unfolded by pulling the transition frame along the expansion direction of the expansion cabin. The second top plate and the second bottom plate of the second-stage expansion cabin body are flipped and unfolded by pulling the outer plate along the expansion direction of the expansion cabin. The unfolding of the top plate and the bottom plate of the first-stage expansion cabin body and the second-stage expansion cabin body is completed by the cooperation of the expansion mechanism and the telescopic transmission mechanism, and can be realized by manual operation. At the same time, the front and rear end plates of the first-stage expansion cabin body and the fixed cabin, and the front and rear end plates of the second-stage expansion cabin body and the two vertical plates of the transition frame are hinged in a door-type opening and closing manner. By manually pushing and pulling outward and flipping 90°, the front and rear end plates of the first-stage expansion cabin body and the second-stage expansion cabin body can be unfolded. The double-stage expansion cabin of the present invention is manually expanded, and the operation is simple, and the expansion and folding functions of the cabin can be quickly realized.

[0020] Compared with the existing expansion cabin that is expanded through a drive system, the present invention has stronger maneuverability, a low failure rate of a purely mechanical expansion structure, and can achieve expansion even in extreme environments such as without electricity, and can adapt to complex and changeable field working environments.

[0021] The double-stage expansion cabin of the present invention has a larger expansion space than the traditional single-stage expansion cabin. At the same time, the double-stage expansion structure of the present invention can continue to be stacked and expanded into three-stage or even more-stage expansion cabins. Taking the three-stage expansion as an example, the outer plate of the second-stage expansion cabin body is replaced with a transition frame, and then a third-stage expansion cabin body with the same structure as the second-stage expansion cabin body is installed on the outside of the replaced transition frame. At the same time, the telescopic rod of the telescopic transmission mechanism is set to three-stage telescopic, so that a three-stage expansion cabin structure can be constructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the double-stage expansion cabin in the folded state in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the deployment process of the first-stage expansion cabin in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a first-level expansion cabin fully deployed in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the deployment process of the secondary expansion cabin in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the fully expanded state of the first-stage expansion cabin and the second-stage expansion cabin in an embodiment of the present invention;

[0027] Figure 6 The isometric view of the double-stage expansion cabin in the embodiment of the present invention in the unfolded state Figure 1 (the first end plate and the second end plate are not unfolded);

[0028] Figure 7 The isometric view of the double-stage expansion cabin in the embodiment of the present invention in the unfolded state Figure 2 (the first end plate and the second end plate are not unfolded);

[0029] Figure 8 It is a schematic structural diagram of the telescopic transmission mechanism in the extended state in an embodiment of the present invention;

[0030] Fig. 9 This is a schematic diagram of the installation of the first end plate and the second end plate in an embodiment of the present invention;

[0031] Fig.10 Schematic diagram of the installation of the first steel wire rope and the second steel wire rope in the embodiment of the present invention Figure 1 ;

[0032] Fig.11 Schematic diagram of the installation of the first steel wire rope and the second steel wire rope in the embodiment of the present invention Figure 2 .

[0033] Description of reference numerals: 1. first-stage expansion cabin, 11. first top plate, 12. first bottom plate, 13. first end plate, 2. transition frame, 21. vertical plate, 22. upper frame plate, 23. lower frame plate, 3. second-stage expansion cabin, 31. second top plate, 32. second bottom plate, 33. second end plate, 34. outer plate, 4. telescopic transmission mechanism, 41. first-stage telescopic rod, 42. second-stage telescopic rod, 5. first expansion mechanism, 51. first connecting rod, 52 .The second connecting rod, 53. The first pulley, 54. The second pulley, 55. The first steel wire rope, 6. The second expansion mechanism, 61. The third connecting rod, 62. The fourth connecting rod, 63. The third pulley, 64. The fourth pulley, 65. The second steel wire rope, 7. The buckle, 8. The locking tongue, 9. The fixed cabin, 91. The fixed cabin top plate, 92. The fixed cabin bottom plate, 93. The mounting boss of the fixed cabin top plate, 94. The mounting platform of the fixed cabin bottom plate, 95. The column, 10. The hinge. DETAILED DESCRIPTION

[0034] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] See also Figure 6 This embodiment provides a double-stage expansion cabin with a large expansion space, which is installed on a special vehicle. The double-stage expansion cabin includes a fixed cabin 9 and expansion cabins symmetrically installed on both sides of the fixed cabin 9. The fixed cabin 9 is the fixed part of the expansion cabin, and its overall appearance is a rectangular parallelepiped structure. With the vehicle's travel direction as the front, the fixed cabin 9 includes a fixed cabin top plate 91 at the top, a fixed cabin bottom plate 92 at the bottom, a fixed cabin front end plate at the front end, and a fixed cabin rear end plate at the rear end. The expansion cabins are symmetrically installed on both sides of the fixed cabin 9. The present invention mainly improves the design of the expansion cabin part. The following is a detailed description of the expansion cabin in which the fixed cabin front end plate faces the front of the vehicle and is installed on the right side of the fixed cabin 9 as an example.

[0037] See also Figure 1 , 4 , 5, 8, the expansion cabin of the present invention is a double-stage expansion structure, including a primary expansion cabin 1, a transition frame 2, a secondary expansion cabin 3, an expansion mechanism and a telescopic transmission mechanism 4. The primary expansion cabin 1, the transition frame 2 and the secondary expansion cabin 3 are sequentially coaxially mounted and connected, and the end of the primary expansion cabin 1 away from the transition frame 2 is mounted and connected to the fixed cabin 9. The primary expansion cabin 1 and the secondary expansion cabin 3 can be expanded and retracted along the installation axis direction, such as Figure 5 As shown, when the primary expansion cabin 1 and the secondary expansion cabin 3 are deployed together, a double-stage expansion cabin is formed on the right side of the fixed cabin 9. The transition frame 2 is used to connect the primary expansion cabin 1 and the secondary expansion cabin 3. The expansion mechanism and the telescopic transmission mechanism 4 cooperate to realize the expansion and folding of the double-stage expansion cabin. The expansion mechanism includes a first expansion mechanism 5 and a second expansion mechanism 6. The first expansion mechanism 5 is used for the expansion and folding of the primary expansion cabin 1, and the second expansion mechanism 6 is used for the expansion and folding of the secondary expansion cabin 3.

[0038] See also Figure 2 , 3 6. A mounting boss 93 for the fixed cabin top plate is provided below the right edge of the fixed cabin top plate 91, and a mounting platform 94 for the fixed cabin bottom plate is provided above the right edge of the corresponding fixed cabin bottom plate 92. The mounting boss 93 for the fixed cabin top plate and the mounting platform 94 for the fixed cabin bottom plate are used to install the expansion cabin. Figure 1 When the expansion cabin is in the folded state, the expansion cabin as a whole constitutes the right side plate of the fixed cabin 9. When the space needs to be expanded, the expansion cabin is unfolded to the right, and can be unfolded in one stage or two stages according to the needs. Figure 5 shown.

[0039] For details, see Figure 6 The transition frame 2 is a connecting component of the primary expansion cabin 1 and the secondary expansion cabin 3. The transition frame 2 is a rectangular frame plate structure and is arranged parallel to the right expansion cabin installation end face of the fixed cabin 9. The transition frame 2 includes two vertical plates 21, an upper frame plate 22 and a lower frame plate 23. The two vertical plates 21 are arranged vertically and in parallel, the two ends of the upper frame plate 22 connect the tops of the two vertical plates 21, the two ends of the lower frame plate 23 connect the bottoms of the two vertical plates 21, and the upper frame plate 22 is parallel to the lower frame plate 23.

[0040] See also Figure 2 , 6 7. The first-stage expansion cabin 1 includes a first top plate 11, a first bottom plate 12 and a first end plate 13. The left end of the first top plate 11 is horizontally hinged to the mounting boss 93 of the fixed cabin top plate through a plurality of hinges 10, so that the first top plate 11 can be flipped up and down along its left end hinge. When the first top plate 11 is flipped upward to a horizontal state, the cabin top plate of the first-stage expansion cabin 1 is formed. The right end of the first bottom plate 12 is hinged to the side of the lower frame plate 23 facing the fixed cabin 9 through a plurality of hinges 10, so that the first bottom plate 12 can be flipped up and down along its right end hinge. When the first bottom plate 12 is flipped downward to a horizontal state, the cabin bottom plate of the first-stage expansion cabin 1 is formed. Also refer to Fig. 9 , two first end plates 13 are symmetrically or parallelly staggeredly installed at the front and rear ends of the right side of the fixed cabin 9. Further, between the mounting boss 93 of the fixed cabin top plate and the mounting platform 94 of the fixed cabin bottom plate, columns 95 are vertically installed at the front and rear ends respectively for installing the first end plates 13. One end of one of the first end plates 13 is vertically hinged to the column 95 at the rear end of the fixed cabin through two hinges 10, and one end of the other first end plate 13 away from the column 95 at the rear end of the fixed cabin is vertically hinged to the column 95 at the front end of the fixed cabin through two hinges 10. The two first end plates 13 can be flipped outwards 90° along their respective hinged ends to form the front end plate and the rear end plate of the first-stage expansion cabin body 1 in the unfolded state. It should be noted that the parallel staggered installation method of the first end plates 13 is suitable for the first-stage expansion cabin body 1 with a wider extension width, and is used when the symmetrical installation of the first end plates 13 within the length range of the fixed cabin 9 cannot meet the extension width requirement of the first-stage expansion cabin body 1. Figure 2 What is shown is the parallel offset installation method.

[0041] See also Figure 4 , 67. The secondary expansion cabin 3 includes a second top plate 31, a second bottom plate 32, a second end plate 33 and an outer plate 34. The left end of the second top plate 31 is horizontally hinged to the side of the upper frame plate 22 facing away from the fixed cabin 9 through a plurality of hinges 10, so that the second top plate 31 can be flipped up and down along its left end hinge. When the second top plate 31 is flipped upward to a horizontal state, the cabin top plate of the secondary expansion cabin 3 is formed in the expanded state. The right end of the second bottom plate 32 is horizontally hinged to the bottom of the outer plate 34 through a plurality of hinges 10, so that the second bottom plate 32 can be flipped up and down along its right end hinge. When the second bottom plate 32 is flipped downward to a horizontal state, the cabin bottom plate of the secondary expansion cabin 3 is formed in the expanded state. See also Fig. 9 The two second end plates 33 are symmetrically installed in the frame of the transition frame 2, and are respectively vertically hinged to the inner side walls of the front and rear vertical plates 21 through two hinges 10. The two second end plates 33 can be turned outward 90 degrees along their respective hinged ends to form the front end plate and the rear end plate of the secondary expansion cabin 3 in the unfolded state. The outer plate 34 is arranged parallel to the overall structure of the transition frame 2. When the secondary expansion cabin 3 is folded, the outer plate 34 is locked with the transition frame 2. For details, refer to Figure 4 A buckle 7 is installed on the outer side wall of the vertical plate 21, and locking tongues 8 cooperating with the buckle 7 are provided on both sides of the outer side plate 34. The locking ring of the buckle 7 can be turned over and put on the locking tongue 8 to achieve locking of the two.

[0042] See also Figure 2-6, 9-11, the first expansion mechanism 5 is provided with two groups, which are symmetrically installed at the front and rear ends of the first-stage expansion cabin 1. Each group of the first expansion mechanism 5 includes a first connecting rod 51, a second connecting rod 52, a first pulley 53, a second pulley 54 and a first steel wire rope 55. Take a group of the first expansion mechanism 5 installed at the rear end of the first-stage expansion cabin 1 as an example: one end of the first connecting rod 51 is hinged to the rear end of the upper frame plate 22 facing the fixed cabin 9, and the other end of the first connecting rod 51 is hinged to the middle of the rear side wall of the first top plate 11. One end of the second connecting rod 52 is hinged to the rear end of the mounting platform 94 of the fixed cabin bottom plate, and the other end of the second connecting rod 52 is hinged to the middle of the rear side wall of the first bottom plate 12. The first pulley 53 is fixedly installed at the rear end of the mounting boss 93 of the fixed cabin top plate, and the second pulley 54 is fixedly installed at the rear side wall end of the first top plate 11 away from its hinged end. One end of the first steel wire rope 55 is fixed to the rear end of the upper frame plate 22, and the other end is wound around the second pulley 54 and the first pulley 53 in sequence and then fixedly connected to the end of the rear side wall of the first bottom plate 12 away from its hinged end. The first steel wire rope 55 is arranged in an S shape, wound around the lower side of the second pulley 54 and the upper side of the first pulley 53. When the transition frame 2 is pulled outward horizontally, the first connecting rod 51, the second connecting rod 52, the first top plate 11, the first bottom plate 12 and the first steel wire rope 55 are linked to achieve expansion under the rolling support of the first pulley 53 and the second pulley 54. The first connecting rod 51 and the second connecting rod 52 are coplanar, and the sliding working surfaces of the first pulley 53, the second pulley 54 and the first steel wire rope 55 are coplanar. During the expansion or retraction process of the first expansion mechanism 5, the two groups of first expansion mechanisms 5 located at the front and rear ends of the first-stage expansion cabin 1 work together to ensure the stability of the expansion or retraction process.

[0043] See also Figure 2-6, 9-11, the second expansion mechanism 6 has the same structure as the first expansion mechanism 5, and the second expansion mechanism 6 is also provided with two groups, which are symmetrically installed at the front and rear ends of the secondary expansion cabin 3. Each group of the second expansion mechanism 6 includes a third connecting rod 61, a fourth connecting rod 62, a third pulley 63, a fourth pulley 64 and a second steel wire rope 65. Take a group of second expansion mechanisms 6 installed at the rear end of the secondary expansion cabin 3 as an example: one end of the third connecting rod 61 is hinged to the rear side of the upper end of the outer plate 34, and the other end is hinged to the middle of the rear side wall of the second top plate 31. One end of the fourth connecting rod 62 is hinged to the rear end of the lower frame plate 23 facing the outer plate 34, and the other end is hinged to the middle of the rear side wall of the second bottom plate 32. The third pulley 63 is fixedly installed at the rear end of the upper frame plate 22, and the fourth pulley 64 is fixedly installed at the rear side wall end of the second top plate 31 away from its hinged end. One end of the second steel wire rope 65 is fixed to the upper end of the outer plate 34, and the other end is wound around the fourth pulley 64 and the third pulley 63 in sequence and then fixedly connected to the end of the rear side wall of the second bottom plate 32 away from its hinged end. The second steel wire rope 65 is arranged in an S shape and wound around the lower side of the fourth pulley 64 and the upper side of the third pulley 63. When the outer plate 34 is pulled outward horizontally, the third connecting rod 61, the fourth connecting rod 62, the second top plate 31, the second bottom plate 32 and the second steel wire rope 65 are linked to achieve expansion under the rolling support of the third pulley 63 and the fourth pulley 64. The third connecting rod 61 and the fourth connecting rod 62 are coplanar, and the sliding working surfaces of the third pulley 63, the fourth pulley 64 and the second steel wire rope 65 are coplanar. During the expansion or retraction process of the second expansion mechanism 6, the two groups of first expansion mechanisms 5 located at the front and rear ends of the secondary expansion cabin 3 work together to ensure the stability of the expansion or retraction process.

[0044] See also Figure 8 The telescopic transmission mechanism 4 is installed at the bottom of the expansion cabin to support the telescopic translation of the transition frame 2 and the outer plate 34. The telescopic transmission mechanism 4 includes a fixed end, a first-stage telescopic rod 41 and a second-stage telescopic rod 42. The fixed end is installed in the fixed cabin bottom plate 92, the first-stage telescopic rod 41 is coaxially telescopically embedded in the inner cavity of the fixed end, the second-stage telescopic rod 42 is coaxially telescopically embedded in the first-stage telescopic rod 41, the extended end of the first-stage telescopic rod 41 is fixedly connected to the lower end surface of the lower frame plate 23, and the extended end of the second-stage telescopic rod 42 is fixedly connected to the bottom surface of the outer plate 34. In order to ensure the stability of the telescopic support, two telescopic transmission mechanisms 4 are arranged side by side at the bottom of the expansion cabin on one side in this embodiment.

[0045] See also Figure 6 , 8In this embodiment, when the first stage of the expansion cabin is unfolded, the transition frame 2 is pulled horizontally to the right. Under the cooperation of the first expansion mechanism 5 and the telescopic transmission mechanism 4, the first top plate 11 is driven by the two connecting rods of the first expansion mechanism 5 and the first steel wire rope 55 to flip upward to a horizontal state, forming the cabin top plate of the first stage expansion cabin 1 in the unfolded state, and the first bottom plate 12 is flipped downward to a horizontal state, forming the cabin bottom plate of the first stage expansion cabin 1 in the unfolded state. At this time, the first stage telescopic rod 41 extends out to support the transition frame 2. Then, the two first end plates 13 are flipped outward by 90° to form the front end plate and the rear end plate of the first stage expansion cabin 1 in the unfolded state. The unfolded first end plates 13 simultaneously form internal support for the first top plate 11 and the first bottom plate 12. When the second stage is unfolded, unlock the buckle 7, pull the outer side plate 34 to the right horizontally, and under the cooperation of the second expansion mechanism 6 and the telescopic transmission mechanism 4, the second top plate 31 is driven by the two connecting rods of the second expansion mechanism 6 and the second steel wire rope 65, and flips upward to a horizontal state to form the cabin top plate of the second stage expansion cabin 3 in the unfolded state, and the second bottom plate 32 flips downward to a horizontal state to form the cabin bottom plate of the second stage expansion cabin 3 in the unfolded state. At this time, the second stage telescopic rod 42 extends out to support the outer side plate 34. Then flip the two second end plates 33 outward by 90 degrees to form the front end plate and the rear end plate of the second stage expansion cabin 3 in the unfolded state. The unfolded second end plates 33 simultaneously form internal support for the second top plate 31 and the second bottom plate 32.

[0046] When folding, the operation is reversed, first flipping inwards to retract the second end plate 33, then pushing the outer plate 34 to the left, the second expansion mechanism 6 and the telescopic transmission mechanism 4 move in the opposite direction, the second top plate 31 flips downwards, and the second bottom plate 32 flips upwards, until the secondary expansion cabin 3 is folded and the buckle 7 is locked. Then, the first end plate 13 is flipped inwards to retract, and then the transition frame 2 is pushed to the left, the first expansion mechanism 5 and the telescopic transmission mechanism 4 move in the opposite direction, the first top plate 11 flips downwards, and the first bottom plate 12 flips upwards, until the primary expansion cabin 1 is folded.

[0047] In other embodiments of the present invention, the two-stage expansion structure can be further stacked and expanded into three or more stages. Taking the three-stage expansion as an example, the outer plate 34 located at the second-stage expansion cabin is replaced with a transition frame, and then a third-stage expansion cabin with the same structure as the second-stage expansion cabin is installed on the outside of the replaced transition frame. At the same time, the telescopic rod of the telescopic transmission mechanism is set to three-stage telescopic, so that a three-stage expansion cabin structure can be constructed.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A double-stage expansion cabin with a large expansion space, comprising a fixed cabin and expansion cabins symmetrically installed on both sides of the fixed cabin; characterized in that: The expansion cabin is a double-stage expansion structure, including a primary expansion cabin body, a transition frame, a secondary expansion cabin body, an expansion mechanism and a telescopic transmission mechanism; The first-stage expansion cabin, transition frame and second-stage expansion cabin are sequentially coaxially mounted and connected, and one end of the first-stage expansion cabin away from the transition frame is mounted and connected to the fixed cabin; the first-stage expansion cabin and the second-stage expansion cabin are expandable and retractable along the installation axis, and form a double-stage expansion cabin when they are deployed together; the transition frame is used to connect the first-stage expansion cabin and the second-stage expansion cabin; The expansion mechanism includes a first expansion mechanism and a second expansion mechanism, which are respectively used for manual expansion and retraction of the primary expansion cabin and the secondary expansion cabin; the telescopic transmission mechanism is installed at the bottom of the expansion cabin, and is used to support the telescopic translation of the transition frame and the secondary expansion cabin.

2. The double-stage expansion cabin with large expansion space according to claim 1, characterized in that: The transition frame is a rectangular frame plate structure, and its rectangular frame is parallel to the fixed cabin, including two vertical plates, an upper frame plate and a lower frame plate; the two vertical plates are vertically and parallelly arranged; the upper frame plate connects the tops of the two vertical plates; the lower frame plate connects the bottoms of the two vertical plates; the lower end surface of the lower frame plate is fixedly connected to the telescopic rod of the telescopic transmission mechanism.

3. The double-stage expansion cabin with large expansion space according to claim 2, characterized in that: The first-level expansion cabin body includes a first top plate, a first bottom plate and a first end plate; one end of the first top plate is horizontally hinged to the upper end of the fixed cabin, and is used to flip upward to form the cabin top plate of the first-level expansion cabin body in the expanded state; one end of the first bottom plate is horizontally hinged to the side of the lower frame plate facing the fixed cabin, and is used to flip downward to form the cabin bottom plate of the first-level expansion cabin body in the expanded state; two of the first end plates are symmetrically or parallelly installed at the front and rear ends of the side of the fixed cabin, and are vertically hinged to the fixed cabin respectively, and are used to flip 90° to the outside of the fixed cabin to form the front end plate and rear end plate of the first-level expansion cabin body in the expanded state.

4. The double-stage expansion shelter with large expansion space according to claim 3, characterized in that: There are two groups of the first expansion mechanism, which are symmetrically installed at both ends of the first-level expansion cabin; each group of the first expansion mechanism includes a first connecting rod, a second connecting rod, a first pulley, a second pulley and a first steel wire rope; one end of the first connecting rod is hinged to the upper frame plate, and the other end is hinged to the middle part of the side wall of the first top plate; one end of the second connecting rod is hinged to the bottom end of the fixed cabin, and the other end is hinged to the middle part of the side wall of the first bottom plate; the first pulley is fixedly installed on the top of the fixed cabin, and the second pulley is fixedly installed on the end of the side wall of the first top plate away from its hinged end; one end of the first steel wire rope is fixed to the upper frame plate, and the other end thereof is successively wrapped around the second pulley and the first pulley and fixedly connected to the end of the first bottom plate away from its hinged end; the first connecting rod and the second connecting rod are coplanar, and the first pulley, the second pulley and the first steel wire rope are coplanar.

5. The double-stage expansion cabin with large expansion space according to claim 4, characterized in that: The first steel wire rope is arranged in an S shape and is wound around the lower side of the second pulley and the upper side of the first pulley.

6. The double-stage expansion cabin with large expansion space according to claim 2, characterized in that: The secondary expansion cabin body includes a second top plate, a second bottom plate, a second end plate and an outer side plate; one end of the second top plate is horizontally hinged to the side of the upper frame plate facing away from the fixed cabin, and is used to flip upward to form the cabin top plate of the secondary expansion cabin body in the expanded state; one end of the second bottom plate is horizontally hinged to the bottom of the outer side plate, and is used to flip downward to form the cabin bottom plate of the secondary expansion cabin body in the expanded state; two second end plates are symmetrically installed in the frame of the transition frame, and are vertically hinged to the inner side walls of the two vertical plates respectively, and are used to flip 90° to the outside of the transition frame to form the front end plate and the rear end plate of the secondary expansion cabin body in the expanded state; the outer side plate is arranged parallel to the transition frame.

7. The double-stage expansion shelter with large expansion space according to claim 6, characterized in that: The second expansion mechanism has the same structure as the first expansion mechanism. There are two groups of second expansion mechanisms, which are symmetrically installed at both ends of the secondary expansion cabin; each group of second expansion mechanisms includes a third connecting rod, a fourth connecting rod, a third pulley, a fourth pulley and a second steel wire rope; one end of the third connecting rod is hinged to the upper end of the outer plate, and the other end is hinged to the middle part of the side wall of the second top plate; one end of the fourth connecting rod is hinged to the lower frame plate, and the other end is hinged to the middle part of the side wall of the second bottom plate; the third pulley is fixedly installed on the upper frame plate, and the fourth pulley is fixedly installed on the end of the side wall of the second top plate away from its hinged end; one end of the second steel wire rope is fixed to the upper end of the outer plate, and the other end thereof is successively wrapped around the fourth pulley and the third pulley and fixedly connected to the end of the second bottom plate away from its hinged end; the third connecting rod and the fourth connecting rod are coplanar, and the third pulley, the fourth pulley and the second steel wire rope are coplanar.

8. The double-stage expansion shelter with large expansion space according to claim 7, characterized in that: The second steel wire rope is arranged in an S shape and is wound around the lower side of the fourth pulley and the upper side of the third pulley.

9. The double-stage expansion shelter with large expansion space according to claim 6, characterized in that: The telescopic transmission mechanism includes a fixed end, a first-stage telescopic rod and a second-stage telescopic rod; the fixed end is installed on the fixed cabin bottom plate, the first-stage telescopic rod is coaxially and telescopically embedded in the inner cavity of the fixed end; the second-stage telescopic rod is coaxially and telescopically embedded in the first-stage telescopic rod; the extended end of the first-stage telescopic rod is fixedly connected to the lower end surface of the lower frame plate, and the extended end of the second-stage telescopic rod is fixedly connected to the bottom surface of the outer plate.

10. The double-stage expansion shelter with large expansion space according to claim 2, characterized in that: The outer side wall of the vertical plate is provided with a buckle for locking the secondary expansion cabin when it is in a retracted state. Both sides of the outer side plate are provided with locking tongues that cooperate with the buckle.

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