阅读说明：本技术 一种多用途救援车厢 (Multipurpose rescue carriage ) 是由 张宏良 于 2021-08-28 设计创作，主要内容包括：本发明公开了一种多用途救援车厢,包括车厢本体、床组件以及传动组件；所述床组件的数量为多个,其包括固定架以及可相对所述固定架在水平状态以及竖直状态切换的床板；所述传动组件的数量为两组,两组所述传动组件对称设置在所述车厢本体内,其可带动所述床组件在所述车厢本体内移动。本发明的多用途救援车厢可以兼顾伤员以及救援物资的双重运输,其内部床组件可以自动移动、折叠,使用方便,结构稳定,其主体折叠结构采用连杆方式,成本低。(The invention discloses a multipurpose rescue carriage which comprises a carriage body, a bed assembly and a transmission assembly, wherein the bed assembly comprises a bed frame and a bed frame; the bed components are multiple in number and comprise a fixed frame and a bed board which can be switched between a horizontal state and a vertical state relative to the fixed frame; the quantity of transmission subassembly is two sets of, and two sets of transmission subassembly symmetry sets up in the carriage is originally internal, and it can drive the bed subassembly is in the carriage is originally internal to be removed. The multipurpose rescue carriage can give consideration to the dual transportation of wounded persons and rescue goods and materials, the inner bed assembly of the multipurpose rescue carriage can be automatically moved and folded, the multipurpose rescue carriage is convenient to use and stable in structure, the main body folding structure of the multipurpose rescue carriage adopts a connecting rod mode, and the cost is low.)

1. A multipurpose rescue carriage is characterized by comprising a carriage body (1), a bed assembly (2) and a transmission assembly (3);

the bed components (2) are multiple in number and comprise a fixed frame (21) and a bed board (22) which can be switched between a horizontal state and a vertical state relative to the fixed frame (21);

the number of transmission components (3) is two sets of, and two sets of transmission components (3) symmetry sets up in carriage body (1), it can drive bed subassembly (2) are in move in carriage body (1).

2. A multi-purpose rescue carriage as claimed in claim 1, characterized in that the transmission assembly (3) comprises a docking mechanism for docking with the bed assembly (2) and an actuator for moving the bed assembly (2) on the carriage body (1);

the actuating mechanism comprises an X shaft assembly (31) arranged transversely and a Z shaft assembly (32) arranged vertically;

the X-axis assembly (31) is used for driving the bed assembly (2) to move along the transverse direction;

the Z-axis assembly (32) is used for driving the bed assembly (2) to do vertical lifting movement.

3. A multi-purpose rescue carriage as claimed in claim 2, characterized in that the X-axis assembly (31) is a chain transmission structure, which is arranged at the bottom of the carriage body (1), the moving end of the X-axis assembly (31) being provided with a plurality of first docking modules (33) for docking with the bed assembly (2);

the first butt-joint module (33) comprises a fixed seat (331) with a fixed groove, and the fixed frame (21) is provided with a bulge (211) matched with the fixed groove;

clamping blocks (332) are arranged on the periphery of the inner wall of the fixing groove, each clamping block (332) is connected with the fixing seat (331) through a second elastic element (333), and the clamping blocks (332) generate pre-pressure after the protrusions (211) enter the fixing groove to play a role in fixing and clamping the protrusions (211).

4. The multipurpose rescue carriage as claimed in claim 3, wherein the Z-axis assembly (32) is a synchronous belt drive structure, and a plurality of second butt-joint modules (34) are fixedly arranged at the moving end of the Z-axis assembly;

the second docking module (34) comprises:

the rotary fixing seat (341) is fixedly connected with the moving end of the Z shaft assembly (32), and two longitudinally extending rotary shafts are symmetrically arranged on the rotary fixing seat (341);

the number of the limiting strips (342) is two, the limiting strips are symmetrically and rotatably connected to the two rotating shafts, the two limiting strips (342) can perform relative opening and closing movement, and the maximum opening and closing angle is 180 degrees;

a third elastic element (343) is arranged between the limiting strips (342) and the rotating shaft and is used for enabling the two limiting strips (342) to have a relative expansion tendency.

5. A multi-purpose rescue carriage as claimed in claim 4, characterized in that the fixing frame (21) is provided with a longitudinally arranged slot (212) for docking with the second docking module (34), the slot (212) having a rib for blocking the second docking module (34) entering the slot (212) from being detached; an unlocking component (213) which pushes the second butt-joint module (34) out of the clamping groove (212) is further arranged on one side of the clamping groove (212).

6. A multi-purpose rescue carriage as claimed in claim 5, characterized in that the unlocking group (213) comprises:

two first gears (213-1) which are meshed with each other, wherein one first gear (213-1) is fixedly connected with an output shaft of the driving motor (213-2), and the other first gear (213-1) is rotationally connected to the fixed frame (21); the direction of an output shaft of the driving motor (213-2) is parallel to the extending direction of the clamping groove (212);

the unlocking group (213) further comprises two racks (213-3) which are connected with the fixed frame (21) in a sliding manner and are symmetrically arranged on two sides of the two first gears (213-1); the rack (213-3) can push the limiting strip (342) to rotate so as to unlock;

a second gear (213-4) is meshed between each rack (213-3) and the adjacent first gear (213-1), and the second gear (213-4) is rotatably connected with the fixed frame (21).

Technical Field

The invention relates to the field of rescue vehicles, in particular to a multipurpose rescue carriage.

Background

According to actual rescue requirements, a plurality of rescue vehicles are used, including road rescue, automobile accident rescue and the like, and for natural disasters, the material rescue vehicle is used for rescuing the vehicle and the like.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides the multipurpose rescue carriage which can be switched quickly and has high automation degree.

The technical scheme is as follows: in order to achieve the purpose, the multipurpose rescue carriage comprises a carriage body, a bed assembly and a transmission assembly; the bed components are multiple in number and comprise a fixed frame and a bed board which can be switched between a horizontal state and a vertical state relative to the fixed frame; the quantity of transmission subassembly is two sets of, and two sets of transmission subassembly symmetry sets up in the carriage is originally internal, and it can drive the bed subassembly is in the carriage is originally internal to be removed.

Preferably, the transmission assembly comprises a docking mechanism for docking with the bed assembly and an actuating mechanism for driving the bed assembly to move on the carriage body; the executing mechanism comprises an X shaft assembly arranged transversely and a Z shaft assembly arranged in the vertical direction; the X-axis assembly is used for driving the bed assembly to move along the transverse direction; the Z shaft assembly is used for driving the bed assembly to do vertical lifting motion.

Preferably, the X-axis assembly is of a chain transmission structure and is arranged at the bottom of the carriage body, and a plurality of first butt-joint modules which are in butt joint with the bed assembly are arranged at the moving end of the X-axis assembly; the first butt-joint module comprises a fixed seat which is provided with a fixed groove, and the fixed seat is provided with a bulge matched with the fixed groove; clamping blocks are arranged on the periphery of the inner wall of the fixing groove, the clamping blocks are connected with the fixing seat through second elastic elements respectively, and the clamping blocks generate pre-pressure after the protrusions enter the fixing groove to play a role in fixing and clamping the protrusions.

Preferably, the Z-axis assembly is a synchronous belt transmission structure, and a plurality of second butt-joint modules are fixedly arranged at a moving end of the Z-axis assembly; the second docking module includes: the rotary fixing seat is fixedly connected with the moving end of the Z shaft assembly, and two rotating shafts extending longitudinally are symmetrically arranged on the rotary fixing seat; the two limiting strips are symmetrically and rotatably connected to the two rotating shafts, the two limiting strips can perform relative opening and closing movement, and the maximum opening and closing angle of the two limiting strips is 180 degrees; and the third elastic element is arranged between the limiting strips and the rotating shaft and used for enabling the two limiting strips to have a relative expansion trend.

Preferably, the fixing frame is provided with a longitudinally arranged clamping groove which is butted with the second butt joint module, the clamping groove is provided with a retaining edge, and the retaining edge can block the second butt joint module entering the clamping groove so as to prevent the second butt joint module from being separated; and an unlocking assembly for pushing the second butt joint module out of the clamping groove is further arranged on one side of the clamping groove.

Preferably, the unlocking assembly comprises: one first gear is fixedly connected with an output shaft of the driving motor, and the other first gear is rotationally connected to the fixed frame; the direction of an output shaft of the driving motor is parallel to the extending direction of the clamping groove; the unlocking assembly also comprises two racks which are in sliding connection with the fixed frame and symmetrically arranged on two sides of the two first gears; the rack can push the limiting strip to rotate so as to unlock; and a second gear is meshed between each rack and the adjacent first gear, and the second gear is rotationally connected with the fixed frame.

Has the advantages that: the multifunctional rescue carriage can rescue wounded persons and transport rescue materials, has the advantages of being high in automation degree, convenient and fast to use and the like, and is stable in structure and low in cost due to the fact that the main structure is designed through the connecting rod structure.

Drawings

FIG. 1 is an overall appearance view of a multi-purpose rescue carriage;

FIG. 2 is an interior view of the wagon body;

FIG. 3 is a partial view of the interior of the wagon body;

fig. 4 is a first state elevation view of the bed assembly;

FIG. 5 is an oblique view of the bed assembly in a first state;

FIG. 6 is a cross-sectional view of a first docking module;

FIG. 7 is a cross-sectional view of a second docking module;

fig. 8 is a second state elevational view of the bed assembly;

FIG. 9 is a first state view of the second docking module docking;

FIG. 10 is a second state view of the docking module docking;

FIG. 11 is a third state view of the docking module docking;

fig. 12 is a control system connection diagram.

The names of the parts indicated by the reference numerals in the drawings are as follows:

the vehicle body 1, the bed assembly 2, the transmission assembly 3, the clamping groove 12, the fixing frame 21, the bed plate 22, the folding assembly 23, the connecting rod assembly 24, the control system 25, the pressure transmission element 26, the X-axis assembly 31, the Z-axis assembly 32, the first butt module 33, the second butt module 34, the protrusion 211, the clamping groove 212, the unlocking assembly 213, the first folding rod 231, the second folding rod 232, the first driving element 233, the first connecting rod 241, the second connecting rod 242, the second driving element 243, the first elastic element 244, the oil pump 251, the oil tank 252, the first reversing valve 253, the first throttle valve 254, the second throttle valve 255, the fixing seat 331, the clamping block 332, the second elastic element 333, the rotary fixing seat 341, the limiting strip 342, the third elastic element 343, the first gear 213-1, the driving motor 213-2, the rack 213-3, and the second gear 213-4

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The multipurpose rescue carriage as shown in the attached figures 1-3 comprises a carriage body 1, a bed assembly 2 and a transmission assembly 3; the bed components 2 are multiple in number and comprise a fixed frame 21 and a bed board 22 which can be switched between a horizontal state and a vertical state relative to the fixed frame 21; the quantity of transmission assembly 3 is two sets of, and two sets of transmission assembly 3 symmetry sets up in the carriage body 1, it can drive bed subassembly 2 is in the carriage body 1 removes.

In this embodiment, the rotatable bed plate 22 structure can be used for reserving space for transporting materials in the rescue carriage, so that the rescue carriage has multiple purposes of transporting wounded persons and rescuing materials.

Further, the bed assembly 2 further comprises two folding mechanisms, as shown in fig. 4, the two folding mechanisms are symmetrically arranged at two ends of the bed board 22, and comprise a folding assembly 23, a connecting rod assembly 24 and a control system 25, wherein the folding assembly 23 can be switched between an unfolded state and a folded state; when the folding assembly 23 is switched between the unfolding state and the folding state, the folding assembly can drive the bed board 22 to be switched between the horizontal state and the vertical state relative to the fixed frame 21; the linkage assembly 24 can lock the unfolded state of the folding assembly 23; the control system 25 is used to control the folding structure movement.

In this embodiment, the unfolding and folding movements of the bed board 22 are realized through the folding structure, and meanwhile, the connecting rod assembly 24 can lock the folding assembly in the unfolding state, so that the bed board 22 can be stably maintained in the horizontal state, and the folding structure can be controlled by the control system 25, so that the bed board 22 can be automatically unfolded and folded, and is more convenient and labor-saving.

Further, as shown in fig. 4 to 5, the folding assembly 23 includes a first folding bar 231 and a second folding bar 232, wherein one end of the first folding bar 231 and one end of the second folding bar 232 are hinged to each other; the other end of the first folding rod 231 is rotatably connected with the fixed frame 21; the other end of the second folding rod 232 is rotatably connected with the bed plate 22; the first folding rod 231 and the second folding rod 232 are collinear when the bed board 22 is in a horizontal state; the folding assembly 23 further includes a first driving element 233, wherein the first driving element 233 is a hydraulic cylinder, and acts on the second folding rod 232 to drive the folding assembly 23 to switch between the unfolded state and the folded state through the second folding rod 232.

In this embodiment, the bed plate 22 is connected with the fixing frame 21 through the first folding rod 231 and the second folding rod 232, when the bed plate 22 is in a horizontal state, the first folding rod 231 and the second folding rod 232 are collinear and are located at the structure dead point position, and at this time, the first folding rod 231 and the second folding rod 232 form a stable triangle with the bed body 1 and the fixing frame 21, so as to play a role of stably supporting the bed plate 22, the structure is stable, and the processing and assembling costs are low; the telescopic inner rod of the first drive element 233 is now in an extended state.

Further, the link assembly 24 includes a first link 241 and a second link 242; one end of the first connecting rod 241 is rotatably connected with one end of the second connecting rod 242, the two connecting rods can perform relative opening and closing movement, the maximum opening and closing angle is 180 degrees, and when the angle between the two connecting rods is 180 degrees, the two connecting rods touch the limiting device and cannot be opened continuously; the second connecting rod 242 is further connected with the fixing frame 21 in a rotating manner, and meanwhile, the other end of the second connecting rod 242 is connected with a second driving element 243; the second driving element 243 is a hydraulic cylinder capable of driving the second connecting rod 242 to rotate; the other end of the first link 241 is coaxially hinged to the first folding rod 231 and the second folding rod 232; the link assembly 24 further includes a first elastic element 244, and the first elastic element 244 is disposed between the first link 241 and the fixed frame 21; when the angle between the first link 241 and the second link 242 is 180 °, the first elastic element 244 has a tendency to make the first link 241 and the second link 242 continue to open;

in this embodiment, when the bed plate 22 is in the horizontal state, the telescopic inner rod of the second driving element 243 is in the retracted state; the angle between the first link 241 and the second link 242 is 180 °, and at this time, the first link 241 and the second link 242 cannot rotate continuously, and the elastic force exerted by the first elastic element 244 to continuously open the first link 241 and the second link 242 can stabilize the angle between the first link 241 and the second link 242 at 180 °; the folding assembly 23 is then locked in the unfolded state; when the bed plate 22 needs to be switched to the vertical state, only the second driving element 243 needs to be controlled to extend the telescopic inner rod, and the second driving element 243 drives the second connecting rod 242 to rotate, so that the balance state of the first connecting rod 241 and the second connecting rod 242 is broken, and the angle between the first connecting rod 241 and the second connecting rod 242 is smaller than 180 degrees; at this time, since the first link 241 is coaxially hinged to the first folding rod 231 and the second folding rod 232, the first link 241 breaks the structure dead points of the first folding rod 231 and the second folding rod 232 while rotating, and thus the unlocking is completed; after the unlocking is completed, the telescopic inner rod of the first driving element 233 stretches to drive the bed board 22 to be folded, and finally, the vertical state is achieved.

Further, the folding structure further comprises a pressure transfer element 26, the first driving element 233 and the second driving element 243 are all hydraulic cylinders, and when the bed plate 22 is in a horizontal state, a telescopic inner rod of the pressure transfer element 26 is in an extended state; the end of the pressure transfer element 26, the first drive element 233 and the second drive element 243 with the telescopic inner rod is called a rod cavity, and the other end is called a rodless cavity;

the pressure transmission element 26 and the first driving element 233 are connected in parallel to form a first parallel loop, wherein the rod cavity of the pressure transmission element 26 is connected with the rod cavity of the first driving element 233, and the rod-free cavity of the pressure transmission element 26 is connected with the rod-free cavity of the first driving element 233.

Further, as shown in fig. 12, the control system 25 includes an oil pressure power assembly and a control valve assembly; the oil pressure power assembly provides driving force for the bed assembly 2 and comprises an oil pump 251 and an oil tank 252; the control valve assembly comprises a first reversing valve 253, the first parallel circuit and the second driving element 243 are both connected with the oil pressure power assembly through the first reversing valve 253, one end of a rodless cavity of the second driving element 243 and one end of a rod cavity of the pressure transfer element 26 are connected with the same working oil port of the first reversing valve 253, and one end of the rod cavity of the second driving element 243 and one end of the rodless cavity of the pressure transfer element 26 are connected with the other working oil port of the first reversing valve 253 together; the first direction switching valve 253 is used to switch the direction of oil pressure applied to the first parallel circuit and the second drive element 243 circuit.

Further, a first throttle valve 254 is provided on each of two connecting passages of the first parallel circuit and the first direction switching valve 253, and the first throttle valve 254 is used for adjusting the oil pressure of the first parallel circuit; second throttle valves 255 are provided in the two connecting passages between the pressure transmitting member 26 and the first driving member 233, respectively, and the second throttle valves 255 are used to regulate the oil pressure flowing into the first driving member 233.

In this embodiment, in the initial state, the bed board 22 is in the horizontal state, as shown in fig. 4-5, the folding assembly 23 is in the open state, the first folding rod 231 and the second folding rod 232 are collinear, and the telescopic inner rod of the first driving element 233 is in the extended state; the link assembly 24 is in a locked state, the first link 241 is collinear with the second link 242, and the telescopic inner rod of the second driving element 243 is in a retracted state; the telescopic inner rod of the pressure transmitting element 26 is in an extended state; when the bed needs to be adjusted to be in a vertical state, the flow is as follows: starting the oil pump 251 to control the state of the first direction valve 253 so that oil flows in from the rod chamber of the first drive element 233, the rodless chamber of the second drive element 243, and the rod chamber of the pressure transmitting element 26; a first throttle valve 254 which controls one end of the rodless cavity of the pressure transfer element 26 to generate pressure on the first parallel circuit, and the pressure acts on one end of the rodless cavity of the first driving element 233 to keep the telescopic inner rod of the first driving element 233 in an extending state; meanwhile, the oil pressure extends the telescopic inner rod of the second driving element 243, the telescopic inner rod of the second driving element 243 drives the second connecting rod 242 to rotate, and the connecting rod assembly 24 is unlocked; after the unlocking is completed, the telescopic inner rod of the pressure transmission element 26 retracts to the innermost end under the action of oil pressure, the oil pressure on the first parallel loop disappears, namely the oil pressure acting on one end of the rodless cavity of the first driving element 233 disappears, at the moment, the telescopic inner rod of the first driving element 233 contracts and drives the folding assembly 23 to be folded, and then the bed plate 22 is driven to rotate, and finally the bed plate 22 moves to the vertical state.

In the process, the pressure transmission element 26 transmits the pressure to the rodless cavity of the first driving element 233 by controlling the first throttle valve 254, and the pressure plays a role in resisting the retraction of the telescopic inner rod of the first driving element 233, so that the delayed movement of the retraction of the telescopic inner rod of the first driving element 233 is realized; the second driving element 243 completes the unlocking movement first, and after the unlocking is completed, the telescopic inner rod of the first driving element 233 retracts, so as to switch the bed plate 22 from the horizontal state to the vertical state.

The switching process of the bed plate 22 from the vertical state to the horizontal state is as follows: first, the oil pump 251 is started, and the state of the first direction valve 253 is controlled so that oil flows in from the rodless chamber of the first drive element 233, the rod chamber of the second drive element 243, and the rodless chamber of the pressure transmitting element 26; the telescopic inner rod of the first driving element 233 and the telescopic inner rod of the pressure transmitting element 26 extend out simultaneously to drive the folding assembly 23 to unfold, and then drive the bed plate 22 to reach the horizontal state, the telescopic inner rod of the second driving element 243 contracts to drive the first connecting rod 241 and the second connecting rod 242 to open and close to 180 degrees for locking, so that the switching of the bed plate 22 from the vertical state to the horizontal state is realized.

Further, the transmission assembly 3 comprises a docking mechanism for docking with the bed assembly 2 and an actuating mechanism for driving the bed assembly 2 to move on the carriage body 1; the executing mechanism comprises an X shaft assembly 31 arranged transversely and a Z shaft assembly 32 arranged vertically; the X-axis assembly 31 is used for driving the bed assembly 2 to move along the transverse direction; the Z-axis assembly 32 is used for driving the bed assembly 2 to vertically lift, the number of the bed assembly 2 is four, the bed assembly 2 is divided into two groups, and each group comprises two bed assemblies 2.

In this embodiment, each transmission assembly 3 can drive two medical beds to move, when an injured person needs to lift the bed assembly 2, the two bed assemblies 2 need to be placed transversely, the two bed assemblies 2 are respectively butted with the moving end of the X shaft assembly 31, after the person lies, the bed assembly 2 close to the Z shaft assembly 32 is driven by the X shaft assembly 31 to move a small distance to the Z shaft assembly 32 and is butted with the Z shaft assembly 32, and then is driven by the Z shaft assembly 32 to move upwards along the vertical direction; meanwhile, the medical bed far away from the Z-axis assembly 32 is driven by the X-axis assembly 31 to move towards the Z-axis assembly 32, and finally, the two bed assemblies 2 are placed up and down (as shown in FIG. 3). When the injured person needs to get off the vehicle when reaching the target point, the bed component 2 located at the lower side moves in the direction away from the Z-axis component 32 under the driving of the X-axis component 31, so as to leave a downward moving space for the bed component 2 located at the upper side, and then the bed component 2 located at the upper side moves to the lowest end under the driving of the Z-axis component 32.

Further, as shown in fig. 5, the X-axis assembly 31 is a chain transmission structure, and is disposed at the bottom of the car body 1, and a plurality of first docking modules 33 that dock with the bed assembly 2 are disposed at a moving end of the X-axis assembly 31; the first docking module 33 includes a fixing base 331 having a fixing groove, and the fixing frame 21 has a protrusion 211 engaged with the fixing groove; clamping blocks 332 are arranged on the periphery of the inner wall of the fixing groove, each clamping block 332 is connected with the fixing seat 331 through a second elastic element 333, and the clamping blocks 332 generate pre-pressure after the protrusion 211 enters the fixing groove to fix and clamp the protrusion 211.

In this embodiment, the clamping block 332 generates a pre-pressure on the protrusion 211 under the action of the second elastic element 333, the pre-pressure can reduce the shaking of the bed assembly 2 during transportation, and the chamfer of the clamping block 332 can make the protrusion 211 smoothly enter the fixing groove.

Further, the Z-axis assembly 32 is a synchronous belt transmission structure, and a plurality of second docking modules 34 are fixedly arranged at a moving end thereof; as shown in fig. 6, the second docking module 34 includes: a rotary fixed seat 341, a limit strip 342 and a third elastic element 343; the rotating fixed seat 341 is fixedly connected with the moving end of the Z-axis assembly 32, and two rotating shafts extending longitudinally are symmetrically arranged on the rotating fixed seat 341; the number of the limiting strips 342 is two, each rotating shaft is rotatably connected with one limiting strip 342, the two limiting strips 342 can perform relative opening and closing movement, and the maximum opening and closing angle is 180 degrees; the third elastic element 343 is disposed between the limiting bars 342 and the rotating shaft, and is used for making the two limiting bars 342 have a relative expansion tendency.

Further, as shown in fig. 9 to 11, a longitudinally disposed slot 212 is disposed on the fixing frame 21 and is abutted with the second butt module 34, and the slot 212 has a rib that can lock the second butt module 34 entering the slot 212 so as to prevent it from being detached; an unlocking component 213 for pushing the second docking module 34 out of the card slot 212 is further disposed on one side of the fixing frame 21.

In this embodiment, as shown in fig. 9, the bed component 2 close to the Z-axis assembly 32 is driven by the X-axis assembly 31 to approach the Z-axis, during the approach, the two limiting strips 342 contact the flanges of the clamping groove 12, the flanges push the limiting strips 342 to rotate, so that an included angle between the two limiting strips 342 is smaller than 180 °, finally the two limiting strips 342 slide into the clamping groove 12, after sliding into the clamping groove 12, the limiting strips 342 reset under the action of the third elastic element 343 and return to 180 °, at this time, the limiting strips are clamped by the flanges, that is, the bed component 2 completes the butt joint with the Z-axis assembly 32, and the bed component 2 can move up and down under the drive of the Z-axis assembly 32; the bed components 2 far away from the Z shaft assembly 32 are driven by the X shaft assembly to approach the Z shaft assembly 32, and finally the two bed components 2 are switched to be placed up and down.

Further, as shown in fig. 11, the unlocking assembly 213 includes: two first gears 213-1 engaged with each other, wherein one first gear 213-1 is fixedly connected with the output shaft of the driving motor 213-2, and the other first gear 213-1 is rotatably connected to the fixed frame 21; the direction of the output shaft of the driving motor 213-2 is parallel to the extending direction of the card slot 212; the unlocking assembly 213 further comprises two racks 213-3 slidably connected with the fixed frame 21, and the racks 213-3 are symmetrically arranged on two sides of the two first gears 213-1; the rack 213-3 can push the limit strip 342 to rotate, so that the limit strip is unlocked; a second gear 213-4 is engaged between each rack 213-3 and the adjacent first gear 213-1, and the second gear 213-4 is rotatably connected to the fixed frame 21.

In this embodiment, when the injured person needs to remove the bed assembly 2, two bed assemblies 2 need to be adjusted to be placed transversely, and at this time, the bed assembly 2 located below is driven by the X-axis assembly 31 to move in a direction away from the Z-axis assembly 32, so as to leave a space for the bed assembly 2 located above; the bed component 2 positioned above moves to the lowest end under the drive of the Z shaft component 32, and the bulge 211 of the bed component is butted with the fixing groove of the X shaft component 31; the bed component 2 moves a small distance to the Z-axis component 32 under the driving of the X-axis component 31, a rotating space is reserved for the limit strip 342, at this time, the driving motor 213-2 drives the rack 213-3 to move towards the limit strip 342 through the first gear 231-1 and the second gear 213-4, the rack 213-3 contacts the limit strip 342 and drives the limit strip 342 to rotate in the moving process, when the openings of the two limit strips 342 are smaller than the opening of the blocking edge of the blocking groove 212, the X-axis component 31 drives the bed component 2 to move a small distance towards the direction far away from the Z-axis component 32, the limit strip 342 is separated from the blocking groove 12, and at this time, the bed component 2 can be lifted away from the carriage body 1.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.