Expandable large multifunctional motor home

Abstract

The invention discloses an expandable large multifunctional motor home, and relates to the technical field of motor homes, a carriage comprises a working area, a control area and a functional area which are arranged in sequence, the working area is provided with an expansion mechanism, and the expansion mechanism is used for widening the carriage and increasing the internal space of the carriage; the expanding mechanism comprises a lifting terrace, expanding boxes, a sliding top beam and a sliding bottom beam, the sliding top beam and the sliding bottom beam are arranged at the top and the bottom of the compartment respectively, and the two expanding boxes are symmetrically arranged and oppositely arranged on the two sides of the compartment; the expanding mechanism mainly acts on a working area, the use area of the working area can be increased, the number of people contained in the working area is increased, the expanding box is in sliding connection with the carriage, stretching and retracting can be achieved through the rack and the track, the use area of the working area is increased when the expanding box stretches out, and lifting of the lifting terrace is used for being matched with the use state of the expanding box; and the solar photovoltaic panel and the diesel generator are used as power generation sources, so that the power supply stability of the motor home is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of recreational vehicles, and in particular to an expandable large-scale multifunctional recreational vehicle. Background Art

[0002] An RV combines the functions of both "house" and "car", but its attribute is still a car. It is a movable type of vehicle with the basic facilities necessary for a home. Generally, an RV is equipped with a variety of home facilities, such as a kitchen, lounge, bathroom, air conditioning, television, etc., realizing the fashionable product of "traveling in life and living in travel".

[0003] With the development of science and technology and market demand, RVs have also developed models based on application scenarios such as meetings, camping vacations, and temporary sites; however, whether it is a small or medium-sized RV for home travel or a large RV based on the needs of a conference room, its internal space is relatively small, and the number of people is greatly restricted, and it cannot completely meet the needs of conference space. Based on this, it is necessary to expand the space of the RV, such as the public (announcement) number: CN115959025A, an expandable box RV, which discloses an expansion plan for a large RV, which achieves folding and expansion through multiple movable plates and several hinged movable rods. The expansion plan uses a large number of parts, and the unfolding and resetting steps are cumbersome and time-consuming. Moreover, the structures used for expansion are all retracted into the car when not in use, occupying a large amount of car space, which is not convenient for the normal use of the RV. It is necessary to propose a RV that is easy to expand and does not affect the use. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an expandable large-scale multifunctional RV, which realizes convenient telescopic expansion through the cooperation of an expansion box with a sliding top beam and a sliding bottom beam. The extension and retraction of the expansion box does not affect the normal use of the RV, thereby increasing the use area of ​​the RV.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: an expandable large-scale multifunctional RV, comprising a chassis, a carriage installed on the chassis, and a front of a vehicle equipped with an engine, the carriage comprising a working area, a control area and a functional area arranged in sequence, the working area being provided with an expansion mechanism, the expansion mechanism being used to widen the carriage and increase the internal space of the carriage, the expansion mechanism comprising a lifting floor, an expansion box, a sliding top beam and a sliding bottom beam respectively arranged on the top and bottom of the carriage, the expansion box being placed between the sliding top beam and the sliding bottom beam, the sliding top beam being provided with multiple ones, a driving device being provided on the sliding top beam, the sliding bottom beam corresponding to the sliding top beam one by one and being arranged perpendicular to each other, two expansion boxes being symmetrically arranged, and the two expansion boxes being relatively arranged on both sides of the carriage.

[0006] The present invention is further configured as follows: a plurality of the sliding top beams are spaced apart in pairs, and the spacing between two adjacent sliding top beams is set to 1500-1536mm; each of the sliding top beams includes two parallel limiting beams, and at least one limiting beam is embedded with a driving device, and two of the driving devices are spaced apart; each of the driving devices includes a servo motor, and a gear is connected to the output shaft of the servo motor, and the gear is arranged in the interval between the two limiting beams; a rack is provided on the top of the expansion box, and the rack is meshed with the gear. When the rack is meshed with the gear, the side of the rack facing away from the gear is horizontal with the lower end surface of the limiting beam, and the rack corresponds one-to-one to the sliding top beams. The two driving devices arranged on each of the sliding top beams are respectively used to drive the two expansion boxes to move toward or away from each other.

[0007] The present invention is further configured as follows: the sliding bottom beams are provided with two groups, each group of sliding bottom beams includes six sliding bottom beams arranged in parallel and at intervals, the two groups of sliding bottom beams are respectively arranged on opposite sides of the carriage, each of the sliding bottom beams includes a positioning track laid in the carriage, a bearing member is provided on the positioning track, two parallel sliding rails are provided on the top of the bearing member, a sliding groove is opened in the sliding rail, the sliding rail is "C" shaped, each of the sliding rails is slidably connected with a rolling member, at least a portion of the rolling member extends into the sliding groove, and the bottom of the expansion box is placed on the rolling member.

[0008] The present invention is further configured as follows: the openings of the slide grooves on two adjacent sliding bottom beams are arranged opposite to each other and back to back, the rolling element includes a first rolling element and a second rolling element, the first rolling element includes a first roller, a first bearing block and a second roller, the second rolling element includes a third roller and a second bearing block, the first roller and the third roller respectively extend into the slide grooves of the corresponding slide rails, the second roller is fixed on the first bearing block, the second roller is arranged horizontally and abuts against the back side of one of the slide rails, and support piers are provided below the first bearing block and the second bearing block, and the bottom of the support pier is fixedly arranged at the bottom of the car body.

[0009] The present invention is further configured as follows: the lifting floor includes a floor platform and multiple hydraulic lifting devices, the hydraulic lifting devices are arranged between the floor platform and the bottom surface of the car, the hydraulic lifting devices include a hydraulic cylinder and a lifting plate, one side of the lifting plate is fixed to the top end of the hydraulic cylinder lifting shaft, and the other side of the lifting plate is against the lower end surface of the floor platform, a detachable conference table and adjustable seats are installed on the floor platform, a paperless conference system is provided on the detachable conference table, a plurality of wall-mounted folding chairs and a plurality of Murphy beds are installed on the inner side of the expansion box, and a hydraulic support foot is also provided in the expansion box, the hydraulic support foot is used to extend and support the expansion box on the ground when in use, and a plurality of windows are arranged in parallel on the expansion box.

[0010] The present invention is further configured as follows: a single-track sliding door is provided between the working area and the control area; a motorhome weak-current system cabinet, a rock slab table, a feces extraction port assembly, and a vehicle control console are arranged in parallel on one side of the control area; and a vehicle door is provided on the other side; a folding door is provided on the vehicle door, and an electric suspension ladder is also provided at the lower part of the vehicle door; the vehicle door is used to enter and exit the vehicle; the bottom of the electric suspension ladder is supported on the ground; a feces box is provided below the control area, and the feces box is connected to the feces extraction port assembly.

[0011] The present invention is further configured as follows: a sliding door is provided between the control area and the functional area; the functional area has parallel solar energy storage batteries and electrical control cabinets, a water heater and a shower room are provided on the same side, a washing machine and a toilet are provided, and a kitchen is provided near the door; a semi-enclosed generator cavity and an air-conditioning outdoor unit cavity are provided at the end of the control area, and a diesel generator and an air-conditioning outdoor unit are respectively installed inside the cavity; a solar photovoltaic panel can also be provided on the top of the carriage, the solar photovoltaic panel is electrically connected to the solar energy storage battery, and the toilet is connected to the feces box.

[0012] The present invention is further configured as follows: a ladder is also provided at the tail of the outer side of the carriage, the ladder is fixedly connected to the outer wall of the carriage, a liftable emergency lighting is also provided on the top of the carriage, the liftable emergency lighting is electrically connected to the electrical control cabinet, and the inside of the walls of each surface of the carriage are sprayed with foam insulation material.

[0013] The present invention is further configured as follows: a liquid crystal display screen and a sound column are also provided in the working area, the liquid crystal display screen is electrically connected to a paperless conference system, an embedded printer is also provided on one side of the liquid crystal display screen, and the paperless conference system is electrically connected to a weak current system cabinet of a motorhome.

[0014] The present invention is further configured as follows: the length of each sliding top beam is set to 2700-2740mm, the interval between the two limiting beams is 150-152mm, the width of each limiting beam is 50-60mm, at least six sliding top beams are provided, and the width of the extended part of the expansion box is 1100-1200mm.

[0015] In summary, the present invention has the following beneficial effects: 1. Set up three areas that do not interfere with each other, each with different uses and functions. The expansion mechanism mainly acts on the work area, which can increase the usable area of ​​the work area and increase the number of people accommodated in the work area; 2. The expansion box is slidably connected to the carriage and can be extended and retracted through racks and rails. When the expansion box is extended, the usable area of ​​the work area is increased, and multiple vertical hydraulic support feet can be extended after the expansion box is extended, which improves the stability and safety of the expansion box. When the expansion box is retracted, it will not affect the normal use of the carriage and is used based on the actual area in the carriage; 3. The lifting floor rises and falls with the use of the expansion box. When the expansion box is extended, the lifting floor rises under the action of the hydraulic lifting device, so that the upper surface of the lifting floor is level with the bottom surface of the expansion box, ensuring the flatness of the car when in use. The detachable conference table and adjustable seats are convenient for adjusting the space in the car. The paperless conference system, LCD screen and sound column improve the application scenarios of the RV; 4. The electric ladder makes it easy to get on and off the RV. The solar photovoltaic panels installed on the roof are conducive to improving the comprehensive utilization of energy. The use of clean energy is safe and environmentally friendly. A variety of living facilities are set up in the functional area, which is conducive to improving the comfort of the RV. The installed diesel generator can be used for emergency power generation and temporary energy supply for high-power consumption equipment. The lifting emergency lighting on the top of the car can provide convenient lighting around the RV, which is conducive to rescue, construction, and night lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the internal structure of the carriage of the present invention; Figure 2 It is a schematic diagram of the carriage expansion state of the present invention; Figure 3 It is a schematic diagram of the expansion box structure of the present invention; Figure 4 It is a schematic diagram of the expansion mechanism of the present invention; Figure 5 It is a schematic diagram of the lifting floor structure of the present invention; Figure 6 It is a schematic diagram of the sliding top beam structure of the present invention; Figure 7 It is a schematic diagram of the limit beam structure of the present invention; Figure 8 It is a side view of a carriage of the present invention; Fig. 9 It is a schematic diagram of the structure of the sliding device of the present invention; Fig.10 It is an enlarged view of part A of the present invention; Fig.11 It is a schematic diagram of the structure of the electric suspension ladder of the present invention.

[0017] In the figure: 1. Chassis; 2. Carriage; 3. Work area; 31. LCD screen; 32. Sound column; 33. Embedded printer; 4. Control area; 41. RV weak current system; 42. Rock slab countertop; 43. Vehicle control console; 44. Electric ladder; 45. Folding door; 46. Manure extraction port assembly; 47. Manure box; 5. Functional area; 51. Solar energy storage battery; 52. Electrical control cabinet; 53. Shower room; 54. Washing machine; 55. Generator cavity; 56. Air conditioner external unit cavity; 57. Toilet; 58. Kitchen; 6. Lift Floor; 61. Hydraulic lifting device; 7. Expansion box; 71. Hydraulic support feet; 72. Murphy bed; 73. Wall-mounted folding chair; 74. Window; 8. Removable conference table; 81. Paperless conference system; 9. Sliding top beam; 91. Limiting beam; 92. Servo motor; 93. Gear; 94. Rack; 10. Sliding device; 101. Positioning track; 102. Bearing member; 103. Slide rail; 104. First roller; 105. Second roller; 106. Third roller; 107. First bearing block; 108. Second bearing block. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2 , Fig.11 As shown, the present invention is an expandable large-scale multifunctional RV, including a chassis 1, a carriage 2 installed on the chassis 1 and a front of a vehicle equipped with an engine, wherein a working area 3, a control area 4 and a functional area 5 are sequentially arranged in the carriage 2, wherein the working area 3 is used as a conference room, a command room and an activity and entertainment room, the control area 4 has a door for entering and exiting the carriage 2, and the door is provided with a folding door 45 and an electric ladder 44, and a RV weak current system cabinet 41, a rock slab table 42, a feces extraction port assembly 46 and a vehicle control console 43 are also arranged on the side away from the door in the control area 4, and the vehicle control console 43 is used to control the expansion of the working area 3 and the paperless conference system 81, and a variety of living facilities and energy storage control devices are arranged in the functional area 5, a solar energy storage battery 51 is electrically connected to a solar photovoltaic panel arranged on the roof, an electrical control cabinet 52 is used to control and distribute the electric energy of the vehicle, and a diesel generator is arranged for emergency power generation, thereby increasing the response measures of the RV in the face of emergencies.

[0020] Specifically, Figure 1-Figure 6As shown, the work area 3 is provided with an expansion mechanism, which is used to expand additional space and increase the usable area in the carriage 2. The expansion mechanism includes a lifting floor 6, an expansion box 7, a sliding top beam 9 and a sliding bottom beam respectively arranged on the top and bottom of the carriage 2. The lifting floor 6 is arranged in the middle of the work area 3 and occupies at least four-fifths of the area of ​​the work area 3. A plurality of hydraulic lifting devices 61 are arranged between the lifting floor 6 and the bottom surface of the carriage 2. The hydraulic lifting devices 61 are distributed in the four corners and the middle area of ​​the lifting floor 6. The hydraulic lifting devices 61 drive the lifting top plate through the hydraulic cylinder to achieve lifting. The overall lifting of the lowering floor 6, the lifting state of the lifting floor 6 is based on the use state of the expansion box 7; when in use, multiple sliding top beams 9 are arranged in parallel and at intervals on the inner top surface of the car 2, and the sliding bottom beams and the sliding top beams 9 are installed on the inner bottom surface of the car 2 in a one-to-one manner. The expansion box 7 is placed between the sliding top beam 9 and the sliding bottom beam, and is slidably connected to the sliding top beam 9 and the sliding bottom beam respectively. Two expansion boxes 7 are symmetrically arranged, and the two expansion boxes 7 are relatively arranged on both sides of the width direction of the car 2. The length of the sliding top beam 9 and the sliding bottom beam is greater than the width of the expansion box 7. When in use, the two expansion boxes 7 move synchronously.

[0021] like Figure 6 , Figure 7 As shown, each sliding top beam 9 is composed of two parallel limit beams 91 and a driving device. The interval between the two limit beams 91 is set to 152mm, and the width of each limit beam 91 is set to 60mm. The driving device includes a servo motor 92 and a gear 93. The gear 93 is installed on the end of the output shaft of the servo motor 92 through a coupling. The interval between the two limit beams 91 forms a movable groove. The servo motor 92 is embedded in one of the limit beams 91, and the output shaft of the servo motor 92 extends into the movable groove, that is, the gear 93 is located in the movable groove. The height of the gear 93 is less than the height of the limit beam 91. The upper end surface of the expansion box 7 is arranged in parallel and at intervals. A plurality of racks 94 are arranged The rack 94 corresponds to the sliding top beam 9 one by one. When in use, at least a portion of the rack 94 extends into the movable groove and meshes with the gear 93. When the rack 94 extends into the movable groove, the lower end surface of the rack 94 is horizontal with the lower end surface of the limiting beam 91. Each rack 94 extends into a corresponding movable groove to achieve smooth movement of the expansion box 7; two expansion boxes 7 are arranged opposite to each other, and the sliding top beam 9 longitudinally spans the width direction of the carriage 2. A driving device is respectively provided at both ends of each sliding top beam 9. The two expansion boxes 7 are respectively connected to the two ends of the sliding top beam 9. When in use, the two expansion boxes 7 move toward or away from each other. When the expansion box 7 is extended, the width of the extended part is 1100-1200mm.

[0022] like Figure 6-Figure 10As shown, the length of each sliding top beam 9 is set to 2700-2740mm, the distance between two adjacent sliding top beams 9 is set to 1500-1536mm, and the width between two adjacent sliding bottom beams arranged perpendicularly thereto is also 1500-1536mm. The sliding bottom beams have two groups that are symmetrically and relatively arranged. The two groups of sliding bottom beams are respectively arranged on both sides of the width direction of the carriage 2. The setting position of each group of sliding bottom beams corresponds to the expansion box 7. The bottoms of the two expansion boxes 7 are respectively located on a corresponding group of sliding bottom beams. Each group of sliding bottom beams includes a plurality of symmetrical and spaced sliding devices 10. Each sliding device 10 includes a positioning rail 101 laid on the bottom surface of the carriage 2 and a bearing member 102 arranged on the positioning rail 101. Two parallel sliding rails 103 are provided on the top of the bearing member 102. One side surface of the sliding rail 103 is recessed inward to form a slide groove. The sliding rail 103 is "C" shaped. Each sliding rail 103 is slidably connected with a rolling member, and a part of the rolling member extends into the slide groove. The same sliding device The opening directions of the slide grooves on the two adjacent sliding devices 10 are consistent, and the slide groove openings on the two adjacent sliding devices 10 are arranged in sequence in a relative and opposite order; the rolling elements on each slide rail 103 include a first rolling element and a second rolling element, the first rolling element includes a first roller 104, a first bearing block 107 and a second roller 105, and the second rolling element includes a third roller 106 and a second bearing block 108, the first roller 104 and the third roller 106 are respectively extended into the slide grooves of the corresponding slide rail 103, and the second roller 105 is fixed on the first roller 104. On the supporting block 107, the second roller 105 is arranged horizontally and abuts against the back of one of the slide rails 103. Support piers are provided below the first supporting block 107 and the second supporting block 108. The bottom of the support pier is fixedly arranged at the bottom of the carriage 2. The first supporting block 107 and the second supporting block 108 are both connected to the bottom of the expansion box 7, that is, the expansion box 7 is fixed on the first supporting block 107 and the second supporting block 108 when in use, and the movement of the expansion box 7 is realized by the first roller 104 and the third roller 106 moving along the slide groove.

[0023] like Figure 4 , Figure 5As shown, the lifting floor 6 is rectangular, which includes a floor platform and multiple hydraulic lifting devices 61. The multiple hydraulic lifting devices 61 are distributed on the bottom surface of the carriage 2. Each hydraulic lifting device 61 is composed of a hydraulic cylinder and a lifting plate. The lifting shaft of the hydraulic cylinder moves vertically, and the lifting plate is fixedly installed on the top of the lifting shaft. The lifting plate is used to synchronously drive the floor platform to move up and down. The hydraulic lifting devices 61 distributed in multiple places improve the stability of the floor platform during movement and provide sufficient lifting force. A detachable conference table 8 and adjustable seats are installed on the floor platform. A paperless conference system 81 is installed on the detachable conference table 8, and multiple ones are provided. The inner side of the expansion box 7 is equipped with a number of wall-mounted folding chairs 73 and a number of Murphy beds 72. A hydraulic support foot 71 is also provided in the expansion box 7. The hydraulic support foot 71 is used to automatically extend and support the expansion box 7 on the ground when it is extended to the outside of the carriage 2, so as to provide sufficient supporting force for the expansion box 7. Multiple windows 74 are arranged in parallel on the expansion box 7.

[0024] In summary, if Figure 1-Figure 10As shown, the working principle of the expansion mechanism is as follows: a plurality of sliding top beams 9 arranged in parallel and at intervals are fixedly installed on the top surface of the inner side of the carriage 2, the length of each sliding top beam 9 corresponds to the width of the carriage 2, and both ends of each sliding top beam 9 are provided with a driving device for synchronously driving the movement of the two expansion boxes 7, and the sliding bottom beams arranged perpendicular to the sliding top beam 9 are arranged on the bottom surface of the inner side of the carriage 2, and the sliding bottom beams are divided into two groups, and the two groups of sliding bottom beams are relatively arranged at the two ends of the width direction of the carriage 2, and the two groups of sliding bottom beams are symmetrically arranged, and each group of sliding bottom beams is used to carry an expansion box 7, and the two groups of sliding bottom beams make the two expansion boxes 7 move synchronously in opposite or opposite directions; when in use, Lift one of the expansion boxes 7 and install it on multiple first bearing blocks 107 and second bearing blocks 108 on the sliding bottom beam, so that the rack 94 set on the top of the expansion box 7 extends into the movable groove, and the rack 94 is meshed with the gear 93, and the driving device at one end is started. The servo motor 92 drives the gear 93 to rotate. The servo motor 92 can rotate forward and reverse. When rotating forward, the gear 93 rotates clockwise, and the rack 94 meshed with it moves out of the carriage 2, driving the expansion box 7 to extend out of the carriage 2. At this time, the first bearing block 107 rolls in the slide groove through the first roller 104, and the second bearing block 108 rolls in another slide groove through the third roller 106. The second roller 105 realizes the synchronous movement of the two bearing blocks. Based on this, when the gear 93 drives the expansion box 7 to move, the expansion box 7 moves along the slide rail 103 through the action of the rolling element. This mechanism makes the expansion box 7 convenient to extend and retract, and convenient to expand and reset, and has high use efficiency. At the same time, when the expansion box 7 extends out of the carriage 2 for expansion, the hydraulic support foot 71 set in the expansion box 7 automatically extends downward. When the expansion box 7 extends to the limit of the carriage 2, the hydraulic support foot 71 contacts the ground to provide support for the expansion box 7. At least two hydraulic support feet 71 are provided on each expansion box 7. At this time, the height of the lifting floor 6 drops, so that the upper end surface of the lifting floor 6 and the end surface of the bottom of the expansion box 7 are aligned. Flush; when the expansion box 7 needs to be extended into the carriage 2, the servo motor 92 reverses, driving the gear 93 to rotate counterclockwise, driving the rack 94 to move in the direction facing the carriage 2, and the expansion box 7 moves along the sliding device 10, and the synchronous lifting floor 6 begins to rise, reserving space for the expansion box 7, and the hydraulic support foot 71 resets upward, and the expansion box 7 moves until the sliding bottom beam has completed the stroke. At this time, the outer wall of the expansion box 7 is level with the outer wall of the carriage 2, and the bottom of the expansion box 7 extends to the bottom of the lifting floor 6, reducing the space occupied in the carriage 2, so that the carriage 2 can still maintain a large usable area, and the two expansion boxes 7 move synchronously to realize the synchronous expansion of the carriage 2 to both sides.

[0025] like Figure 1 , Fig.11As shown, other areas in the carriage 2 are also provided with a number of facilities. A liquid crystal display screen 31, an embedded printer 33 and a plurality of sound columns 32 are also provided on one side wall of the detachable conference table 8 in the work area 3. The above devices are all electrically connected to the paperless conference system 81 and are used for image and sound playback of the paperless conference system 81. The control area 4 is located between the work area 3 and the functional area 5. The RV weak current system 41 in the control area 4 is electrically connected to the paperless conference system 81. The door for entering and exiting the carriage 2 is arranged in the control area 4. The door is connected to the ground through an electric ladder 44, and a folding door 45 is provided on the door. The functional area 5 is mainly used for living facilities. The functional area 5 has parallel solar energy storage batteries 51 and an electrical control cabinet 52, a water heater and a shower room 53 arranged on the same side, a washing machine 54 and a toilet 57. , a kitchen 58 is arranged near the door, a semi-enclosed generator cavity 55 and an air-conditioning outdoor unit cavity 56 are also provided at the end of the control area 4, and a diesel generator and an air-conditioning outdoor unit are installed inside them respectively. A solar photovoltaic panel can also be arranged on the top of the carriage 2, and the solar photovoltaic panel is electrically connected to the solar energy storage battery 51, a toilet 57 is connected to a feces box 47, the feces box 47 is arranged below the control area 4, and the feces box 47 is connected to the feces extraction port assembly 46, and a lifting emergency lighting lamp is also provided on the top of the carriage 2, which can be used for night lighting, and the lifting emergency lighting lamp is electrically connected to the electrical control cabinet 52, and the interior of the walls of each surface of the carriage 2 is sprayed with foam insulation material to improve the insulation effect of the carriage 2. The multifunctional RV can be used in various scenes such as meetings, on-site command and dispatch, outdoor live broadcasts, camping and vacations, which improves the application scope of the RV.

[0026] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An expandable large multifunctional RV, comprising a chassis (1), a carriage (2) mounted on the chassis (1), and a front portion equipped with an engine, characterized in that: The carriage (2) comprises a working area (3), a control area (4) and a functional area (5) which are arranged in sequence. The working area (3) is provided with an expansion mechanism, which is used to widen the carriage (2) and increase the internal space of the carriage (2). The expansion mechanism comprises a lifting floor (6), an expansion box (7), a sliding top beam (9) and a sliding bottom beam which are respectively arranged at the top of the carriage (2) and the bottom of the carriage (2). The expansion box (7) is placed between the sliding top beam (9) and the sliding bottom beam. There are multiple sliding top beams (9). A driving device is arranged on the sliding top beam (9). The sliding bottom beam corresponds to the sliding top beam (9) one by one and is arranged perpendicular to each other. Two expansion boxes (7) are symmetrically arranged, and the two expansion boxes (7) are arranged on both sides of the carriage (2) relative to each other.

2. The expandable large multifunctional RV according to claim 1, characterized in that: The plurality of sliding top beams (9) are arranged in pairs, and the spacing between two adjacent sliding top beams (9) is set to 1500-1536 mm. Each of the sliding top beams (9) comprises two parallel limit beams (91), at least one limit beam (91) is embedded with a driving device, two of the driving devices are arranged at intervals, each of the driving devices comprises a servo motor (92), an output shaft of the servo motor (92) is connected to a gear (93), and the gear (93) is arranged between the two limit beams (91). In the interval between the limiting beams (91), a rack (94) is provided on the top of the expansion box (7), and the rack (94) is meshed with the gear (93). When the rack (94) is meshed with the gear (93), the side of the rack (94) facing away from the gear (93) is level with the lower end surface of the limiting beam (91), and the rack (94) corresponds to the sliding top beam (9) one by one. The two driving devices provided on each of the sliding top beams (9) are respectively used to drive the two expansion boxes (7) to move toward or away from each other.

3. The expandable large multifunctional RV according to claim 2, characterized in that: The sliding bottom beams are provided with two groups, each group of sliding bottom beams includes six sliding bottom beams arranged in parallel and at intervals, and the two groups of sliding bottom beams are respectively arranged on opposite sides of the carriage (2), each of the sliding bottom beams includes a positioning track (101) laid in the carriage (2), a bearing member (102) is provided on the positioning track (101), and two parallel sliding rails (103) are provided on the top of the bearing member (102), and a sliding groove is opened in the sliding rail (103), and the sliding rail (103) is "C" shaped. Each of the sliding rails (103) is slidably connected to a rolling member, and at least a part of the rolling member extends into the sliding groove, and the bottom of the expansion box (7) is placed on the rolling member.

4. The expandable large multifunctional RV according to claim 3, characterized in that: The openings of the slide grooves on two adjacent sliding bottom beams are arranged opposite to each other and spaced apart from each other. The rolling element comprises a first rolling element and a second rolling element. The first rolling element comprises a first roller (104), a first bearing block (107) and a second roller (105). The second rolling element comprises a third roller (106) and a second bearing block (108). The first roller (104) and the third roller (106) respectively extend into the slide grooves of the corresponding slide rails (103). The second roller (105) is fixed on the first bearing block (107). The second roller (105) is arranged horizontally and abuts against the back side of one of the slide rails (103). Support piers are arranged below the first bearing block (107) and the second bearing block (108). The bottom of the support pier is fixedly arranged at the bottom of the carriage (2).

5. The expandable large multifunctional RV according to claim 4, characterized in that: The lifting floor (6) comprises a floor platform and a plurality of hydraulic lifting devices (61), wherein the hydraulic lifting devices (61) are arranged between the floor platform and the bottom surface of the carriage (2), wherein the hydraulic lifting devices (61) comprise a hydraulic cylinder and a lifting plate, wherein one side of the lifting plate is fixed to the top end of the hydraulic cylinder lifting shaft, and the other side of the lifting plate is against the lower end surface of the floor platform, wherein a detachable conference table (8) and an adjustable seat are installed on the floor platform, wherein the detachable conference table (8) is provided with a paperless conference system (81), wherein the inner side surface of the expansion box (7) is provided with a plurality of wall-mounted folding chairs (73) and a plurality of Murphy beds (72), wherein the expansion box (7) is further provided with a hydraulic support foot (71), wherein the hydraulic support foot (71) is used to extend the expansion box (7) and support it on the ground when it is in use, and wherein a plurality of windows (74) are arranged in parallel on the expansion box (7).

6. The expandable large multifunctional RV according to claim 1, characterized in that: A single-track sliding door is provided between the working area (3) and the control area (4); a motorhome weak current system cabinet (41), a rock slab table (42), a feces extraction port assembly (46), and a vehicle control console (43) are arranged in parallel on one side of the control area (4); and a vehicle door is provided on the other side. A folding door (45) is provided on the vehicle door, and an electric suspension ladder (44) is also provided at the bottom of the vehicle door. The vehicle door is used for entering and exiting the vehicle compartment (2), and the bottom of the electric suspension ladder (44) is supported on the ground. A feces box (47) is provided below the control area (4), and the feces box (47) is connected to the feces extraction port assembly (46).

7. The expandable large multifunctional RV according to claim 1, characterized in that: A sliding door is provided between the control area (4) and the functional area (5). The functional area (5) has a solar energy storage battery (51) and an electrical control cabinet (52) arranged in parallel, a water heater and a shower room (53) arranged on the same side, a washing machine (54) and a toilet (57), and a kitchen (58) arranged near the door. A semi-enclosed generator cavity (55) and an air-conditioning external machine cavity (56) are also provided at the end of the control area (4), and a diesel generator and an air-conditioning external machine are respectively installed therein. A solar photovoltaic panel can also be provided on the top of the carriage (2), and the solar photovoltaic panel is electrically connected to the solar energy storage battery (51). The toilet (57) is connected to the feces box (47).

8. The expandable large multifunctional RV according to claim 7, characterized in that: A ladder is also provided at the rear of the outer side of the carriage (2), and the ladder is fixedly connected to the outer wall of the carriage (2). A liftable emergency lighting lamp is also provided on the top of the carriage (2), and the liftable emergency lighting lamp is electrically connected to the electrical control cabinet (52). The interior of the walls of each surface of the carriage (2) is sprayed with foam insulation material.

9. The expandable large multifunctional RV according to claim 1, characterized in that: A liquid crystal display screen (31) and a sound column (32) are also provided in the working area (3); the liquid crystal display screen (31) is electrically connected to a paperless conference system (81); an embedded printer (33) is also provided on one side of the liquid crystal display screen (31); and the paperless conference system (81) is electrically connected to a cabinet of a weak current system (41) of a motorhome.

10. The expandable large multifunctional RV according to claim 2, characterized in that: The length of each sliding top beam (9) is set to 2700-2740 mm, the interval between the two limiting beams (91) is 150-152 mm, the width of each limiting beam (91) is 50-60 mm, at least six sliding top beams (9) are provided, and the width of the extended part of the expansion box (7) is 1100-1200 mm.

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