Foldable stretcher trolley

Abstract

The invention belongs to the technical field of ambulance equipment, and provides a foldable stretcher cart which comprises a cart body and a stretcher arranged on the cart body, the cart body comprises a cart body, a walking assembly, a first locking assembly and a handle assembly, and the walking assembly, the first locking assembly and the handle assembly are arranged on the cart body. The first end of the first bearing assembly is hinged to the first end of the second bearing assembly, so that the vehicle body has an unfolded state and a folded state which can be switched mutually. The foldable stretcher trolley provided by the invention is simple in structure, can be folded, saves space and is convenient to store.

Description

Technical Field

[0001] The invention relates to the technical field of rescue equipment, and in particular to a foldable stretcher trolley. Background Art

[0002] As a commonly used rescue tool, stretcher trolleys are widely used in medical and rescue industries due to their advantages of saving manpower and fast transfer speed. However, the current foldable stretcher trolleys have a fixed structure and cannot be folded, which results in them occupying a large space and being inconvenient to store. Summary of the invention

[0003] In view of the defects in the prior art, an object of the present invention is to provide a foldable stretcher trolley to solve or alleviate the above-mentioned technical problems existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a foldable stretcher trolley, comprising a trolley and a stretcher arranged on the trolley, the trolley comprising a trolley body and a walking assembly, a first locking assembly and a handle assembly arranged on the trolley body, the trolley body comprising a first bearing assembly and a second bearing assembly, the first end of the first bearing assembly and the first end of the second bearing assembly being hinged so that the trolley body has an unfolded state and a folded state that can be switched between each other.

[0005] Further, a first hinged portion is provided at the bottom of the first end of the first bearing assembly, a second hinged portion is provided at the bottom of the first end of the second bearing assembly, and an end of the first hinged portion away from the first bearing assembly and an end of the second hinged portion away from the second bearing assembly are hinged, so that the hinge center line is located at the bottom of the vehicle body;

[0006] When unfolding, the end side wall of the first end of the first bearing assembly and the end side wall of the first end of the second bearing assembly can contact each other to limit the unfolding of the first bearing assembly and the second bearing assembly;

[0007] When folded, a storage space can be formed between the first carrying component and the second carrying component.

[0008] Furthermore, the walking assembly comprises:

[0009] A first caster with a smaller diameter, which is a universal wheel, two of which are provided, and the two first casters are respectively provided on both sides of the bottom of the second end of the first bearing assembly;

[0010] A first mounting frame, a first end of which is connected to the first caster and a second end of which is fixedly connected to the first bearing assembly, and the first mounting frame is a retractable structure;

[0011] Two second casters with a larger diameter are provided, and the two second casters are respectively arranged on both sides of the bottom of the second end of the second bearing assembly;

[0012] a second mounting frame, a first end of which is connected to the second caster and a second end of which is hinged to the second bearing assembly, so that the second mounting frame has a folded position and an unfolded position that can be switched between each other, and when the second mounting frame is in the folded position, the second caster is located at both ends of the storage space to protect the internal space of the storage space; and

[0013] A second locking structure is arranged on the second mounting frame and the second supporting assembly. The second locking structure has a locking state and an unlocking state that can be switched to each other. When the second locking structure is in the locking state, the second locking structure can lock the second mounting frame to lock the second mounting frame in the expanded position; when the second locking structure is in the unlocking state, the second locking structure releases the lock on the second mounting frame to allow the second mounting frame to swing back and forth between the folded position and the expanded position.

[0014] Furthermore, the cart further comprises a limiting assembly, and the limiting assembly comprises:

[0015] a screw rod rotatably disposed within the second bearing assembly; and

[0016] a limiting element, which corresponds to the screw rod, the limiting element is slidably connected to the second bearing assembly, the limiting element is sleeved on the screw rod and is threadedly connected to the screw rod;

[0017] In which, the limiting element has a first position and a second position that can be switched with each other, and the first end of the first bearing component is correspondingly provided with a limiting hole that cooperates with the limiting element. When the limiting element is in the first position, the limiting element retracts into the second bearing component, thereby separating the limiting element from the limiting hole; when the limiting element is in the second position, the limiting element can be inserted into the limiting hole.

[0018] Furthermore, two of the limit assemblies are provided, and the two limit assemblies are respectively provided on both sides of the second bearing assembly;

[0019] The handle assembly includes two first handles, the two first handles correspond to the two screw rods respectively, the first handle is movably connected to the second bearing assembly, the first handle is coaxially arranged with the screw rod, and the first end of the first handle is sleeved with the power input end of the screw rod, the first handle is slidably connected with the screw rod, so that the first handle can drive the screw rod to rotate, and at the same time, the first handle can also switch between a folded position and an unfolded position along the axis of the screw rod;

[0020] The cart also includes:

[0021] A third locking assembly, which is arranged on the second bearing assembly or the first bearing assembly, and the third locking assembly has a locked state and an unlocked state that can be switched between each other;

[0022] Wherein, when the third locking assembly is in an unlocked state, the third locking assembly releases the lock on the limiting element, so that the limiting element can reciprocate between the first position and the second position;

[0023] When the third locking assembly is in a locked state, the third locking assembly can lock the limiting element in the second position and lock the first handle so that the first handle cannot rotate; and

[0024] a fourth locking assembly, which is arranged on the second bearing assembly, and the fourth locking assembly has a locked state and an unlocked state that can be switched between each other;

[0025] Wherein, when the fourth locking assembly is in an unlocked state, the fourth locking assembly releases the lock on the first handle, so that the first handle can be switched between a folded position and an unfolded position;

[0026] When the fourth locking assembly is in a locked state, the fourth locking assembly can lock the first handle in a folded position or an unfolded position.

[0027] Further, the third locking assembly comprises:

[0028] a third locking element, which is arranged in the second bearing assembly, the third locking element is slidably connected to the second bearing assembly, the third locking element has a locking position and an unlocking position that can be switched with each other, the third locking element is provided with a third locking portion, the limiting element is correspondingly provided with a third locking socket adapted to the third locking portion, and when the limiting element is in the second position, the third locking socket corresponds to the third locking portion;

[0029] A driving structure is arranged on the second bearing assembly, and is used to move the third locking element from a locking position to an unlocking position or from an unlocking position to a locking position.

[0030] Furthermore, the driving structure comprises:

[0031] A reel, which is disposed in the second bearing assembly and is rotatably connected to the second bearing assembly;

[0032] A pull rope, which is arranged in the second bearing assembly, wherein a first end of the pull rope is fixedly connected to the third locking element, and a second end of the pull rope is connected to the reel;

[0033] a third elastic element, which is disposed in the second bearing assembly, wherein a first end of the third elastic element is connected to the third locking element, and a second end of the third elastic element is connected to the second bearing assembly, and in a natural state, the third elastic element applies elastic force to the third locking element so that the third locking element has a tendency to move from an unlocked position to a locked position; and

[0034] A knob is rotatably connected to the second bearing assembly, and a power output shaft of the knob is drivingly connected to a power input shaft of the reel.

[0035] Furthermore, the driving structure further includes:

[0036] A limiting wheel, which is arranged in the second bearing assembly, the limiting wheel is rotatably connected to the second bearing assembly, and the limiting wheel is transmission-connected to the winding wheel;

[0037] A limiting slider, which is arranged on one side of the limiting wheel, and the limiting slider is slidably connected to the second bearing assembly so that the limiting slider can reciprocate between the third position and the fourth position;

[0038] Wherein, the circumferential side wall of the limiting wheel is provided with ratchet teeth, and the end of the limiting slider facing the limiting wheel is provided with ratchet teeth matching with the ratchet teeth;

[0039] When the limiting slider is in the third position, the ratchet teeth cooperate with the ratchet teeth so that the limiting wheel can only rotate along the first preset direction;

[0040] When the limit slider is in the fourth position, the ratchet teeth are separated from the ratchet teeth, so that the limit wheel can rotate in both the forward direction and the reverse direction;

[0041] A scroll torsion spring, which is arranged at the rotation center of the limiting wheel, the two ends of the scroll torsion spring are respectively connected to the limiting wheel and the second bearing assembly, and in a natural state, the scroll torsion spring applies elastic force to the limiting wheel so that the limiting wheel has a tendency to rotate along the second preset direction;

[0042] a fifth elastic element, a first end of which is connected to the limit slider and a second end of which is connected to the second bearing assembly, and in a natural state, the fifth elastic element applies elastic force to the limit slider so that the limit slider has a tendency to move from the fourth position to the third position;

[0043] A driving slider, which is slidably connected to the limit slider, so that the driving slider can be reciprocated between the fifth position and the sixth position;

[0044] Wherein, a driving part cooperating with the driving slider is correspondingly arranged on the side wall of the limiting element, and when the driving slider is in the fifth position, the driving slider can cooperate with the driving part, so that the limiting element can apply a force to the limiting slider through the driving part and the driving slider, so as to drive the limiting slider to move;

[0045] When the driving slider is in the sixth position, the driving slider cannot cooperate with the driving portion, so that the limiting element cannot apply a force to the limiting slider through the driving slider;

[0046] and driving inclined surfaces are provided on both sides of one end of the driving slider facing the limiting element, so that when the limiting slider is in the third position and the fourth position, the limiting element can apply a force to the driving slider through the driving portion and the driving inclined surface to drive the driving slider from the fifth position to the sixth position; and

[0047] a sixth elastic element, a first end of which is connected to the driving slider, a second end of which is connected to the limiting slider, and in a natural state, the sixth elastic element applies elastic force to the driving slider so that the driving slider has a tendency to move from the sixth position to the fifth position;

[0048] Wherein, the power output shaft of the knob is transmission-connected with the power input shaft of the limiting wheel.

[0049] Beneficial effects of the present invention:

[0050] The foldable stretcher trolley provided by the present invention has a vehicle body that is configured as a first load-bearing component and a second load-bearing component that are hinged to each other, so that the vehicle body has an unfolded state and a folded state that can be switched between each other. When storing, the vehicle body is switched from the unfolded state to the folded state, thereby achieving the purpose of saving space and facilitating storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0052] Figure 1 A three-dimensional exploded view of a foldable stretcher trolley provided by an embodiment of the present invention;

[0053] Figure 2 for Figure 1 An enlarged view of section A is shown;

[0054] Figure 3 for Figure 1 An enlarged view of section B is shown;

[0055] Figure 4 for Figure 1 A front view of the trolley of the stretcher trolley shown;

[0056] Figure 5 for Figure 4 The cross-sectional view in the CC direction is shown;

[0057] Figure 6 for Figure 5 An enlarged view of section E is shown;

[0058] Figure 7 for Figure 6 An enlarged view of section G is shown;

[0059] Figure 8 for Figure 5 An enlarged view of section F is shown;

[0060] Fig. 9 for Figure 4 A cross-sectional view in the DD direction is shown;

[0061] Fig.10 for Fig. 9 An enlarged view of section H is shown;

[0062] Fig.11 for Figure 1 A perspective view of a third locking assembly of the stretcher trolley is shown;

[0063] Fig.12 for Figure 1 A perspective view of a foldable stretcher trolley is shown with the trolley in a folded state.

[0064] Reference numerals:

[0065] 110, first bearing assembly; 111, first frame; 112, first bearing plate; 113, first hinged portion; 114, limiting socket; 120, second bearing assembly; 121, second frame; 122, second bearing plate; 123, second hinged portion; 124, annular locking groove; 101, limiting hole; 210, first caster; 220, first mounting bracket; 230, second caster; 240, second mounting bracket; 241, second locking socket; 251, second locking element; 201, second locking portion; 252, second elastic element; 260, U-shaped clamping member; 310, locking belt; 320, lock buckle; 330, locking structure; 331, first unlocking button; 410, a first handle; 510, a screw rod; 520, a limiting element; 521, a third locking socket; 522, a driving unit; 610, a third locking element; 611, a third locking unit; 621, a reel; 622, a pull rope; 623, a third elastic element; 624, a knob; 625, a limiting wheel; 601, a ratchet; 626, a limiting slider; 602, a ratchet; 627, a fifth elastic element; 628, a driving slider; 603, a driving ramp; 629, a sixth elastic element; 710, a fourth locking element; 720, a second unlocking button; 730, a limiting shaft; 731, a first shaft; 732, a second shaft; 740, a fourth elastic element; 800, a stretcher; 810, a supporting foot. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0067] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the invention belongs.

[0068] In the description of the present application, 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", "axial", "radial", "circumferential" 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, and do not indicate or imply 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.

[0069] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0070] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] like Figure 1-11 As shown, the present invention provides a foldable stretcher trolley, comprising a trolley and a stretcher 800 arranged on the trolley.

[0073] The cart comprises a body, a walking assembly, a first locking assembly and a handle assembly.

[0074] The walking assembly is arranged at the bottom of the vehicle body, and is used to support the vehicle body, and at the same time, enables the vehicle body to stably walk on the ground through the walking assembly.

[0075] The first locking assembly is disposed on the vehicle body, and has a locking state and an unlocking state that can be switched with each other. When the first locking assembly is in the locking state, the first locking assembly can fix the stretcher 800 on the vehicle body. When the first locking assembly is in the unlocking state, the first locking assembly releases the lock on the stretcher 800 so that the stretcher 800 can be separated from the vehicle body.

[0076] The handle assembly is disposed at the second end of the first bearing assembly 110 and / or the second bearing assembly 120 , and the handle assembly is used by medical personnel to apply force to the vehicle body to drive the cart to move.

[0077] The bottom of the stretcher 800 is provided with four supporting legs 810 , and the body of the stretcher 800 is correspondingly provided with four limiting holes 101 .

[0078] When in use, the stretcher 800 is placed on the cart and the four supporting legs 810 of the stretcher 800 are inserted into the four limiting holes 101 on the cart body. At the same time, the first locking assembly is switched from the unlocked state to the locked state to fix the stretcher 800 on the cart. The medical staff / rescuer applies force to the cart body through the handle assembly, thereby driving the cart carrying the stretcher 800 to move, thereby achieving the purpose of quickly transferring the patient.

[0079] After the patient is moved to the target position, the first locking assembly is switched to an unlocked state, thereby achieving the purpose of removing the stretcher 800 from the trolley.

[0080] like Figure 1 , 2 As shown, the first locking assembly includes a locking band 310 and a locking structure 330 .

[0081] The first end of the locking belt 310 is connected to the first side of the vehicle body, and the second end is connected to the buckle 320. The locking structure 330 is arranged on the second side of the vehicle body. When the buckle 320 is inserted into the locking structure 330, the locking structure 330 can fix the buckle 320 on the second side of the vehicle body. By pressing the first unlocking button 331 of the locking structure 330, the locking structure 330 can release the lock of the buckle 320, so that the buckle 320 can be separated from the locking structure 330. The cooperation between the locking structure 330 and the buckle 320 is an existing technology, for example, the buckle 320 and the locking structure 330 of the car seat belt, which will not be described in detail here.

[0082] Preferably, the locking structure 330 installed on the first bearing assembly 110 and the locking structure 330 installed on the second bearing assembly 120 are staggered so that when the cart is in the folded state, it can be locked in the folded state by the first locking assembly.

[0083] like Figure 1 , 4 As shown in Figures 5 and 12, in the present embodiment, the vehicle body includes a first load-bearing component 110 and a second load-bearing component 120, and the first end of the first load-bearing component 110 and the first end of the second load-bearing component 120 are hinged so that the vehicle body has an unfolded state and a folded state that can be switched to each other. When storing, the vehicle body is switched from the unfolded state to the folded state, thereby achieving the purpose of saving space and facilitating storage, and when working, the vehicle body is switched from the folded state to the unfolded state.

[0084] Specifically, Figure 1 , 12As shown, the first bearing assembly 110 includes a first frame 111 and a first bearing plate 112 fixedly mounted on the first frame 111 . The second bearing assembly 120 includes a second frame 121 and a second bearing plate 122 mounted on the second frame 121 .

[0085] The foldable stretcher trolley provided by the present invention has a vehicle body that is configured as a first load-bearing component 110 and a second load-bearing component 120 that are hinged to each other, so that the vehicle body has an unfolded state and a folded state that can be switched between each other. When storing, the vehicle body is switched from the unfolded state to the folded state, thereby achieving the purpose of saving space and facilitating storage.

[0086] like Figure 1 , 4 As shown in FIG. 12 , a first hinged portion 113 is provided at the bottom of the first end of the first supporting component 110, and a second hinged portion 123 is provided at the bottom of the first end of the second supporting component 120. An end of the first hinged portion 113 away from the first supporting component 110 and an end of the second hinged portion 123 away from the second supporting component 120 are hinged so that the hinge center line is located at the bottom of the vehicle body.

[0087] When unfolded, the end side wall of the first end of the first bearing component 110 and the end side wall of the first end of the second bearing component 120 can interfere with each other to limit the unfolding of the first bearing component 110 and the second bearing component 120. There is no need to set an additional limiting structure to limit the unfolding of the first bearing component 110 and the second bearing component 120, thereby achieving the purpose of simplifying the structure and saving costs; when folded, a storage space can be formed between the first bearing component 110 and the second bearing component 120, thereby achieving the purpose of being able to store objects and fully utilize the space. At the same time, the first bearing component 110 and the second bearing component 120 can also protect objects placed in the storage space, reducing the possibility of objects being damaged by external forces.

[0088] like Figure 1 , 4 As shown in , 9, 10, and 12, the walking assembly includes a first caster 210, a first mounting frame 220, a second caster 230, a second mounting frame 240, and a second locking structure.

[0089] The first caster 210 is a universal wheel, and the diameter of the first caster 210 is relatively small. Two first casters 210 are provided, and the two first casters 210 are respectively provided on both sides of the bottom of the second end of the first bearing assembly 110. The first end of the first mounting frame 220 is connected to the first caster 210, and the second end is fixedly connected to the first bearing assembly 110. The first mounting frame 220 is a retractable structure, so that when unfolded, the support height of the first caster 210 and the first mounting frame 220 for the vehicle body can meet the push-pull requirements of medical personnel / rescue personnel, and when folded, the first caster 210 can be folded between the first bearing assembly 110 and the second bearing assembly 120, thereby improving the overall foldability of the cart.

[0090] Specifically, in this embodiment, the first mounting frame 220 is a telescopic rod corresponding to the first caster 210, the first end of the telescopic rod is connected to the first caster 210, and the second end is fixedly connected to the first bearing assembly 110. The first mounting frame 220 in this embodiment has a simple structure.

[0091] The diameter of the second caster 230 is relatively large, and two second casters 230 are provided, and the two second casters 230 are respectively provided on both sides of the bottom of the second end of the second bearing assembly 120. The first end of the second mounting frame 240 is connected to the second caster 230, and the second end is hinged to the second bearing assembly 120, so that the second mounting frame 240 has a folded position and an unfolded position that can be switched to each other, and when the second mounting frame 240 is in the folded position, the second casters 230 are located at both ends of the storage space to protect the internal space of the storage space, thereby achieving the purpose of further reducing the possibility of objects in the storage space being damaged by external forces.

[0092] The second locking structure is disposed on the second mounting frame 240 and the second bearing assembly 120, and the second locking structure has a locked state and an unlocked state that can be switched to each other. When the second locking structure is in the locked state, the second locking structure can lock the second mounting frame 240 to lock the second mounting frame 240 in the unfolded position; when the locking assembly is in the unlocked state, the second locking structure releases the lock on the second mounting frame 240, so that the second mounting frame 240 can swing back and forth between the folded position and the unfolded position.

[0093] The walking assembly in this embodiment has a simple structure and can be folded, thereby improving the overall foldability of the cart. At the same time, the second caster 230 can also protect the internal space of the storage space.

[0094] like Fig. 9 , 10 As shown, the second locking structure includes a second locking element 251 and a second elastic element 252 .

[0095] The second locking element 251 is slidably connected to the second bearing assembly 120, and the second locking element 251 has an unlocking position and a locking position that can be switched with each other. When the second locking element 251 is in the unlocking position, the second locking structure is in an unlocking state, and when the second locking element 251 is in the locking position, the second locking structure is in a locking state. The two ends of the second elastic element 252 are respectively connected to the second locking element 251 and the second bearing assembly 120, and in a natural state, the second elastic element 252 applies elastic force to the second locking element 251, so that the second locking element 251 has a tendency to move from the unlocking position to the locking position.

[0096] The second locking element 251 has a second locking portion 201, and the second mounting frame 240 is correspondingly provided with a second locking socket 241 that matches the second locking portion 201. When the second locking element 251 is in the locking position, the second locking portion 201 is inserted into the second locking socket 241, and the second locking portion 201 and the second locking socket 241 cooperate with each other, thereby achieving the purpose of locking the second mounting frame 240 in the unfolded position. When the second locking element 251 is in the unlocking position, the second locking portion 201 is separated from the second locking socket 241, thereby achieving the purpose of unlocking the second mounting frame 240.

[0097] Specifically, when unfolding, the second mounting frame 240 is first swung from the folded position to the unfolded position; then the second locking pin is moved from the unlocked position to the locked position, so that the second locking portion 201 is inserted into the second locking socket 241. With the mutual cooperation between the second locking portion 201 and the second locking socket 241, the purpose of locking the second mounting frame 240 in the unfolded position can be achieved.

[0098] When folding, first move the second locking pin from the locking position to the unlocking position to separate the second locking portion 201 from the second locking hole 241; then the second mounting frame 240 can be swung from the unfolded position to the folded position.

[0099] The second locking structure in this embodiment has a simple structure, reasonable design and convenient operation.

[0100] like Figure 5 , 6 As shown in , 7 , the cart further includes a limiting assembly, which includes a screw rod 510 and a limiting element 520 .

[0101] The screw rod 510 is rotatably disposed in the second bearing assembly 120. The limiting element 520 corresponds to the screw rod 510, and the limiting element 520 is slidably connected to the second bearing assembly 120. The limiting element 520 has a first position and a second position that can be switched to each other. The limiting element 520 is sleeved on the screw rod 510 and is threadedly connected to the screw rod 510. When the screw rod 510 is rotated, the limiting element 520 can be driven to switch between the first position and the second position.

[0102] Among them, a limiting socket 114 is correspondingly provided at the first end of the first bearing component 110 for cooperating with the limiting element 520. When the limiting element 520 is in the first position, the limiting element 520 retracts into the second bearing component 120, thereby separating the limiting element 520 from the limiting socket 114; when the limiting element 520 is in the second position, the limiting element 520 can be inserted into the limiting socket 114, thereby limiting the first bearing component 110 and the second bearing component 120, which can keep the vehicle body in the unfolded state. At the same time, through the mutual cooperation between the limiting element 520 and the first bearing component 110 and the second bearing component 120, the first support component and the second support component are supported, so as to increase the connection strength at the connection between the first bearing component 110 and the second bearing component 120, so as to achieve the purpose of avoiding damage to the connection between the first bearing component 110 and the second bearing component 120 due to load-bearing during the transportation of patients.

[0103] Specifically, when unfolding, the screw 510 is rotated to move the limiting element 520 from the first position to the second position, so that the limiting element 520 is inserted into the limiting hole 114, thereby achieving the purpose of keeping the first load-bearing component 110 and the second load-bearing component 120 in the unfolded state. At the same time, the limiting element 520 cooperates with the first load-bearing component 110 and the second load-bearing component 120 to support the first support component and the second support component, so as to increase the connection strength at the connection between the first load-bearing component 110 and the second load-bearing component 120, thereby achieving the purpose of avoiding damage to the connection between the first load-bearing component 110 and the second load-bearing component 120 due to load-bearing during the process of transporting patients.

[0104] When folding, the screw rod 510 is rotated to move the limiting element 520 from the second position to the first position, so that the limiting element 520 is separated from the limiting insertion hole 114, thereby achieving the purpose of switching the vehicle body from the unfolded state to the folded state.

[0105] In this embodiment, by setting a limit component, the first supporting component 110 and the second supporting component 120 can be maintained in the expanded state, and at the same time, the first supporting component 110 and the second supporting component 120 can be supported to increase the connection strength at the connection between the first supporting component 110 and the second supporting component 120, thereby avoiding damage to the connection between the first supporting component 110 and the second supporting component 120 due to load-bearing during the process of transporting patients.

[0106] Of course, the screw rod 510 and the limiting element 520 can also be arranged on the first bearing component 110, and the limiting socket 114 is correspondingly arranged on the second bearing component 120. The other structures are the same as above and will not be elaborated here.

[0107] like Figure 5 As shown, in this embodiment, two limit assemblies are provided, and the two limit assemblies are respectively provided on both sides of the second bearing assembly 120 .

[0108] The handle assembly includes two first handles 410, the two first handles 410 correspond to two screw rods 510 respectively, the first handle 410 is movably connected to the second bearing assembly 120, the first handle 410 and the screw rod 510 are coaxially arranged, and the first end of the first handle 410 and the power input end of the screw rod 510 are mutually sleeved, either the first end of the first handle 410 is sleeved on the power input end of the screw rod 510, or the power input end of the screw rod 510 is sleeved on the first end of the first handle 410. The first handle 410 is slidably connected to the screw rod 510, so that the first handle 410 can drive the screw rod 510 to rotate, and at the same time, the first handle 410 can also switch between the folded position and the unfolded position along the axis of the screw rod 510, so as to achieve the purpose of enabling the first handle 410 to be retractable and foldable.

[0109] The cart also includes a third locking assembly and a fourth locking assembly.

[0110] The third locking assembly is arranged on the second bearing assembly 120 or the first bearing assembly 110, and the third locking assembly has a locking state and an unlocking state that can be switched with each other, wherein when the third locking assembly is in the unlocking state, the third locking assembly releases the lock on the limiting element 520 so that the limiting element 520 can reciprocate between the first position and the second position.

[0111] When the third locking assembly is in the locked state, the third locking assembly can lock the limiting element 520 in the second position and lock the first handle 410, so that the first handle 410 cannot be rotated. Specifically, since the limiting element 520 cannot move, the screw rod 510 cannot be rotated, and then the first handle 410 cannot be rotated, thereby achieving the purpose of locking the first handle 410, which can prevent the handle from rotating due to operational errors during the transfer of the patient, thereby driving the limiting element 520 from the second position to the first position, and at the same time, it can also avoid the problem of inconvenience in exerting force caused by the handle being able to rotate.

[0112] The fourth locking component is arranged on the second supporting component 120, and the fourth locking component has a locking state and an unlocking state that can be switched between each other. When the fourth locking component is in the unlocking state, the fourth locking component releases the lock on the first handle 410, thereby achieving the purpose of enabling the first handle 410 to switch between the folded position and the unfolded position.

[0113] When the fourth locking assembly is in a locked state, the fourth locking assembly can lock the first handle 410 in a folded position or an extended position. Specifically, when the first handle 410 is in the folded position, the fourth locking assembly is placed in a locked state, so that the first handle 410 can be locked in the folded position, thereby further improving the foldability of the cart; when the first handle 410 is in the extended position, the fourth locking assembly is placed in a locked state, so that the first handle 410 can be locked in the extended position, thereby achieving the purpose of applying a force to the cart through the first handle 410 to drive the cart to move.

[0114] When unfolding, first move the first handle 410 from the folded position to the unfolded position, and put the fourth locking assembly into a locked state to lock the first handle 410 in the unfolded position; then rotate the first handle 410, the first handle 410 drives the screw rod 510 to rotate, the screw rod 510 drives the limiting element 520 to move, so as to move the limiting element 520 from the first position to the second position, and put the third locking assembly into a locked state to lock the limiting element 520 in the second position. At this time, since the limiting element 520 cannot move, the screw rod 510 cannot rotate, and the first handle 410 cannot rotate either, so that the first handle 410 can neither move along the axis of the screw rod 510 nor rotate around the axis of the screw rod 510, so as to achieve the purpose of applying a force to the cart through the first handle 410 without causing the first handle 410 to rotate or move, thereby achieving the purpose of improving the stability of applying a force to the cart.

[0115] When folding, first put the third locking assembly in the unlocked state to release the lock on the limiting element 520, rotate the first handle 410, the first handle 410 drives the screw 510 to rotate, and the screw 510 drives the limiting element 520 to move, thereby achieving the purpose of driving the limiting element 520 from the second position to the first position; then put the fourth locking assembly in the unlocked state, and at the same time, move the first handle 410 to move the first handle 410 from the unfolded position to the folded position.

[0116] In this embodiment, by connecting the first handle 410 to the screw rod 510, there is no need to additionally provide a driving handle to drive the screw rod 510 to rotate, thereby simplifying the structure. At the same time, when unfolded, the first handle 410 can also be locked so that the first handle 410 cannot be rotated or moved, thereby improving the stability of the force applied to the cart through the first handle 410.

[0117] like Figure 5 , 6 As shown in FIGS. 7 and 11 , in the present embodiment, taking the third locking assembly being arranged on the second bearing assembly 120 as an example, the structure of the third locking assembly being arranged on the first bearing assembly 110 is the same as that of the first bearing assembly 110, and no further details will be given here.

[0118] The third locking assembly includes a third locking element 610 and a driving structure.

[0119] The third locking element 610 is disposed in the second bearing assembly 120, and the third locking element 610 is slidably connected to the second bearing assembly 120. The third locking element 610 has a locking position and an unlocking position that can be switched with each other. The third locking element 610 is provided with a third locking portion 611, and the limiting element 520 is correspondingly provided with a third locking socket 521 adapted to the third locking portion 611. When the limiting element 520 is in the second position, the third locking socket 521 corresponds to the third locking portion 611.

[0120] When the third locking hole 521 corresponds to the third locking portion 611, the third locking element 610 is switched from the unlocked position to the locked position, and the third locking portion 611 is inserted into the third locking hole 521. Under the cooperation between the third locking portion 611 and the third locking hole 521, the purpose of locking the limiting element 520 in the second position is achieved. The third locking element 610 is switched from the locked position to the unlocked position, so that the third locking portion 611 is separated from the third locking hole 521, and the locking of the limiting element 520 can be released, thereby achieving the purpose of enabling the limiting element 520 to switch between the first position and the second position.

[0121] The driving structure is disposed on the second bearing assembly 120 , and is used to move the third locking element 610 from the locking position to the unlocking position or from the unlocking position to the locking position.

[0122] When unfolded, after the limiting element 520 is in the second position, the third locking element 610 is moved to the locking position through the driving structure, and the third locking portion 611 and the third locking socket 521 cooperate with each other to achieve the purpose of locking the limiting element 520 in the second position.

[0123] When folded, the third locking element 610 is moved to the unlocking position by the driving structure, so that the third locking portion 611 is separated from the third locking hole 521, thereby releasing the lock on the limiting element 520, and allowing the limiting element 520 to move back and forth between the first position and the second position.

[0124] The third locking assembly provided in this embodiment has a simple structure and a reasonable design. By driving the third locking element 610 to move by the driving structure, the third locking assembly can be switched back and forth between the locked state and the unlocked state, and the operation is convenient.

[0125] like Figure 5 , 6 As shown in , 7 and 11 , the driving structure includes a reel 621 , a pull rope 622 , a third elastic element 623 and a knob 624 .

[0126] The reel 621 is disposed in the second bearing assembly 120, and the reel 621 is rotatably connected to the second bearing assembly 120. The pull rope 622 is disposed in the second bearing assembly 120, and the first end of the pull rope 622 is fixedly connected to the third locking element 610, and the second end is connected to the reel 621. The third elastic element 623 is disposed in the second bearing assembly 120, and the first end of the third elastic element 623 is connected to the third locking element 610, and the second end is connected to the second bearing assembly 120, and in a natural state, the third elastic element 623 applies elastic force to the third locking element 610, so that the third locking element 610 has a tendency to move from the unlocked position to the locked position.

[0127] The knob 624 is rotatably connected to the second bearing assembly 120, and the power output shaft of the knob 624 is drivingly connected to the power input shaft of the reel 621. It should be noted that the power output shaft of the knob 624 is drivingly connected to the power input shaft of the reel 621, and the knob 624 can be sleeved on the power input shaft of the reel 621, or the power output shaft of the knob 624 can be drivingly connected to the power input shaft of the reel 621 through a transmission structure, and the transmission structure can be a gear structure, a synchronous belt structure, etc., which will not be described in detail here.

[0128] When folding, the knob 624 is turned, and the knob 624 drives the reel 621 to rotate in the positive direction. The reel 621 reels the pull rope 622, thereby driving the third locking element 610 to the unlocking position through the pull rope 622 to release the lock on the limiting element 520, thereby achieving the purpose of moving the limiting element 520.

[0129] When unfolded, the limiting element 520 is moved to the second position so that the third locking portion 611 and the third locking hole 521 correspond to each other. Under the action of the elastic force of the third elastic element 623, the third elastic element 623 drives the third locking element 610 from the unlocking position to the locking position, thereby achieving the purpose of locking the limiting element 520. The structure is simple and easy to operate.

[0130] like Figure 5 , 6 As shown in FIGS. 7 and 11 , the driving structure further includes a limiting wheel 625 , a limiting slider 626 , a scroll torsion spring, a fifth elastic element 627 , a driving slider 628 and a sixth elastic element 629 .

[0131] The limiting wheel 625 is arranged in the second bearing assembly 120, the limiting wheel 625 is rotatably connected with the second bearing assembly 120, and the limiting wheel 625 is transmission-connected with the reel 621, so that the limiting wheel 625 can drive the reel 621 to rotate. It should be noted that the limiting wheel 625 is transmission-connected with the reel 621, and the limiting wheel 625 and the reel 621 can be fixedly connected, or the limiting wheel 625 and the reel 621 can be transmission-connected through a transmission structure, and the transmission structure can be a gear structure, a synchronous belt structure, etc., which is not too limited in the present invention. In the present embodiment, the limiting wheel 625 is coaxially arranged with the reel 621 and is fixedly connected with the reel 621.

[0132] The limiting slider 626 is disposed on one side of the limiting wheel 625 , and the limiting slider 626 is slidably connected to the second bearing assembly 120 , so that the limiting slider 626 can reciprocate between the third position and the fourth position.

[0133] The circumferential side wall of the limiting wheel 625 is provided with ratchet teeth 601, and the end of the limiting slider 626 facing the limiting wheel 625 is provided with ratchet teeth 602 that match with the ratchet teeth 601. When the limiting slider 626 is in the third position, the ratchet teeth 602 match with the ratchet teeth 601, so that the limiting wheel 625 can only rotate in the first preset direction (i.e., the positive direction). At this time, the winding wheel 621 can only be driven by the limiting wheel 625 to rotate in the positive direction to reel in the pull rope 622, so that the third locking element 610 is driven from the locking position to the unlocking position by the pull rope 622. When the limiting slider 626 is in the fourth position, the ratchet teeth 602 are separated from the ratchet teeth 601, so that the limiting wheel 625 can rotate in both the positive direction and the reverse direction.

[0134] The scroll torsion spring is arranged at the rotation center of the limiting wheel 625, and the two ends of the scroll torsion spring are respectively connected to the limiting wheel 625 and the second bearing assembly 120, and in the natural state, the scroll torsion spring applies elastic force to the limiting wheel 625 so that the limiting wheel 625 has a tendency to rotate along the second preset direction (reverse direction).

[0135] The first end of the fifth elastic element 627 is connected to the limit slider 626, and the second end is connected to the second bearing assembly 120. In the natural state, the fifth elastic element 627 applies elastic force to the limit slider 626 so that the limit slider 626 has a tendency to move from the fourth position to the third position.

[0136] The driving slider 628 is slidably connected to the limiting slider 626, so that the driving slider 628 can switch back and forth between the fifth position and the sixth position. The side wall of the limiting element 520 is correspondingly provided with a driving portion 522 that matches the driving slider 628. When the driving slider 628 is in the fifth position, the driving slider 628 can match with the driving portion 522, so that the limiting element 520 can apply a force to the limiting slider 626 through the driving portion 522 and the driving slider 628 to drive the limiting slider 626 to move; when the driving slider 628 is in the sixth position, the driving slider 628 cannot match with the driving portion 522, and the limiting element 520 cannot apply a force to the limiting slider 626 through the driving slider 628, so it cannot drive the limiting slider 626 to move, and at the same time, the driving slider 628 cannot hinder the movement of the limiting element 520.

[0137] Driving slopes 603 are provided on both sides of the end of the driving slider 628 facing the limiting element 520, so that when the limiting slider 626 is in the third position and the fourth position, the limiting element 520 can apply a force to the driving slider 628 through the driving part 522 and the driving slope 603 to drive the driving slider 628 from the fifth position to the sixth position, thereby not affecting the movement of the limiting element 520.

[0138] The first end of the sixth elastic element 629 is connected to the driving slider 628, and the second end is connected to the limiting slider 626. In the natural state, the sixth elastic element 629 applies elastic force to the driving slider 628 so that the driving slider 628 has a tendency to move from the sixth position to the fifth position.

[0139] Among them, the power output shaft of the knob 624 is in transmission connection with the power input shaft of the limiting wheel 625. It should be noted that the power output shaft of the knob 624 is in transmission connection with the power input shaft of the limiting wheel 625, and the power output shaft of the knob 624 can be fixedly connected with the power input shaft of the limiting wheel 625, or the power output shaft of the knob 624 can be in transmission connection with the power input shaft of the limiting wheel 625 through a transmission structure, and the transmission structure can be a gear structure, a synchronous belt structure, etc. In this embodiment, the power output shaft of the knob 624 is in transmission connection with the power input shaft of the limiting wheel 625 through a transmission structure.

[0140] In the natural state, the knob 624 is turned, and the knob 624 drives the limiting wheel 625 to rotate in the positive direction. The limiting wheel 625 drives the reel 621 to rotate in the positive direction. The reel 621 reels the pull rope 622, and the pull rope 622 exerts a time force on the third locking element 610, so that the third locking element 610 overcomes the elastic force of the third elastic element 623 and moves from the locked position to the unlocked position.

[0141] When unfolding, the screw rod 510 is rotated, and the screw rod 510 drives the limiting element 520 to move from the first position to the second position. In this process, first, the driving part 522 interacts with the driving slider 628, so that the limiting slider 626 moves from the third position to the fourth position. Under the action of the scroll torsion spring, the scroll torsion spring drives the limiting wheel 625 to rotate in the opposite direction, and the limiting wheel 625 drives the reel 621 to rotate in the opposite direction to release the pull rope 622. After the limiting element 520 moves to the second position, the third locking hole 521 corresponds to the third locking element 610. Under the action of the elastic force of the third elastic element 623, the third elastic element 623 can drive the third locking element 610 from the unlocking position to the locking position, thereby achieving the purpose of locking the limiting element 520.

[0142] After the limit slider 626 moves to the fourth position, since the limit slider 626 cannot move further, the limit element 520 applies a force to the driving slider 628 through the driving part 522 and the driving inclined surface 603 to drive the driving slider 628 from the fifth position to the sixth position, so that the limit element 520 can smoothly move from the first position to the second position. After the driving slider 628 is driven to the sixth position, the limit slider 626 is driven from the fourth position to the third position under the elastic force of the fifth elastic element 627, thereby making the ratchet 602 cooperate with the ratchet 601, so that when folding, the reel 621 is driven to reel the pull rope 622 by rotating the knob 624. When the external force disappears, due to the cooperation between the ratchet 602 and the ratchet 601, the spiral torsion spring cannot drive the limit wheel 625 to rotate in the opposite direction.

[0143] When folding, the knob 624 is turned, and the knob 624 drives the limiting wheel 625 to rotate in the positive direction, and the limiting wheel 625 drives the winding wheel 621 to rotate in the positive direction. When the external force disappears, the limiting wheel 625 cannot rotate in the reverse direction due to the cooperation between the ratchet teeth 602 and the ratchet teeth 601, so the spiral torsion spring cannot drive the limiting wheel 625 to rotate in the reverse direction. Afterwards, the screw 510 is turned to drive the limiting element 520 to move from the second position to the first position. During this process, when the driving part 522 corresponds to the driving slider 628, since the limiting slider 626 is in the third position and cannot move, the limiting element 520 can apply a force to the driving slider 628 through the driving part 522 and the driving inclined surface 603 to drive the driving slider 628 from the fifth position to the sixth position, so that the limiting element 520 can smoothly move from the second position to the first position.

[0144] The driving structure in this embodiment has a simple structure, and by setting the limiting wheel 625, the limiting slider 626, the scroll torsion spring, the fifth elastic element 627, the driving slider 628 and the sixth elastic element 629, only one person can complete the operation when folding and unfolding, without the need for one person to turn the knob 624 and the other person to turn the screw 510, which saves labor costs and makes the operation more convenient.

[0145] like Figure 3 , 8 As shown, the fourth locking assembly includes a fourth locking element 710 , a second unlocking button 720 , a limiting shaft 730 and a fourth elastic element 740 .

[0146] The fourth locking element 710 is movably disposed in the side wall of the first handle 410 so that the fourth locking element 710 can move radially along the first handle 410. An annular locking groove 124 matching the fourth locking element 710 is correspondingly disposed in the second bearing assembly 120, and two annular locking grooves 124 are provided. When the first handle 410 is in the folded position, one of the annular locking grooves 124 corresponds to the fourth locking element 710, and when the first handle 410 is in the unfolded position, the other annular locking groove 124 corresponds to the fourth locking element 710.

[0147] The fourth locking element 710 has a locking position and an unlocking position that can be switched with each other. Specifically, when the fourth locking element 710 is in the locking position, the fourth locking element 710 is inserted into the annular locking groove 124; when the fourth locking element 710 is in the unlocking position, the fourth locking element 710 is separated from the annular locking groove 124.

[0148] The limiting shaft 730 includes a first shaft body 731 with a smaller outer diameter and a second shaft body 732 with a larger outer diameter. The first shaft body 731 and the second shaft body 732 are coaxially arranged and integrally formed. The limiting shaft 730 is movably arranged in the handle so that the limiting shaft 730 can switch back and forth between the seventh position and the eighth position along the axis of the handle. Specifically, when the limiting shaft 730 is in the seventh position, the second shaft body 732 corresponds to the fourth locking element 710, so that the fourth locking element 710 cannot move from the locked position to the unlocked position; when the limiting shaft 730 is in the eighth position, the first shaft body 731 corresponds to the fourth locking element 710, so that the fourth locking element 710 can move from the locked position to the unlocked position.

[0149] The first end of the fourth elastic element 740 is connected to the limit shaft 730, and the second end is connected to the first handle 410. In the natural state, the fourth elastic element 740 applies elastic force to the limit shaft 730 so that the limit shaft 730 has a tendency to move from the eighth position to the seventh position.

[0150] The second unlocking button 720 is in transmission connection with the limiting shaft 730 . When in operation, the limiting shaft 730 can be driven from the seventh position to the eighth position by pressing the second unlocking button 720 .

[0151] Among them, the first end of the fourth locking element 710 and at least one of the limiting shafts 730 are provided with a first guide surface, and the second end of the fourth locking element 710 and the side wall of the annular locking groove 124 are provided with a second guide surface. The first guide surface and the second guide surface can be arc surfaces or inclined surfaces.

[0152] When unlocking, press the second unlocking button 720, thereby applying a force to the limit shaft 730 through the second unlocking button 720, thereby driving the limit shaft 730 from the seventh position to the eighth position, so that the first shaft body 731 corresponds to the fourth locking element 710, and then move the first handle 410. Under the action of the second guide surface, the fourth locking element 710 can be driven from the locked position to the unlocked position, thereby achieving the purpose of releasing the lock on the first handle 410, and then achieving the purpose of moving the first handle 410.

[0153] When locked, the fourth locking element 710 corresponds to the annular locking groove 124, and under the action of the elastic force of the fourth elastic element 740, the limiting shaft 730 moves from the eighth position to the seventh position. During this process, under the action of the first guide surface, the limiting shaft 730 drives the fourth locking element 710 from the unlocked position to the locked position. When the limiting shaft 730 moves to the seventh position, the second shaft body 732 corresponds to the fourth locking element 710, so that the fourth locking element 710 cannot move from the locked position to the unlocked position, thereby achieving the purpose of locking the handle.

[0154] like Figure 8 As shown, in this embodiment, the fourth locking element 710 is spherical.

[0155] The fourth locking element 710 in this embodiment has a simple structure, is easy to operate, and can lock reliably.

[0156] Preferably, a U-shaped clamping member 260 adapted to the second caster is correspondingly provided on the first bearing assembly 110 and / or the second bearing assembly 120, and when the cart is in the folded state, the U-shaped clamping member 260 can clamp the second caster.

[0157] Preferably, a seventh elastic element 750 is sleeved on the screw rod 510. When the first handle 410 is in the folded position, the seventh elastic element 750 applies elastic force to the first handle 410, so that the first handle 410 has a tendency to move from the folded position to the unfolded position. When the fourth locking assembly releases the lock on the first handle 410, under the action of the elastic force of the seventh elastic element 750, the first handle 410 can move a preset distance from the folded position to the unfolded position, so as to facilitate the unfolding of the first handle 410.

[0158] It should be noted that the second elastic element 252, the third elastic element 623, the fourth elastic element 740, the fifth elastic element 627, the sixth elastic element 629, and the seventh elastic element 750 can be any elastic element that can provide elastic force for the corresponding parts, such as: a spring, a rubber spring, a gas spring, a hydraulic spring, a rubber band, etc. In this embodiment, the second elastic element 252, the third elastic element 623, the fourth elastic element 740, the fifth elastic element 627, the sixth elastic element 629, and the seventh elastic element 750 are springs.

[0159] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A foldable stretcher trolley, comprising a trolley and a stretcher (800) arranged on the trolley, wherein the trolley comprises a body and a walking assembly, a first locking assembly and a handle assembly arranged on the body, characterized in that: The vehicle body comprises a first bearing assembly (110) and a second bearing assembly (120), wherein a first end of the first bearing assembly (110) and a first end of the second bearing assembly (120) are hingedly connected so that the vehicle body has an unfolded state and a folded state that can be switched between each other.

2. The foldable stretcher trolley according to claim 1, characterized in that: A first hinged portion (113) is provided at the bottom of the first end of the first bearing assembly (110), and a second hinged portion (123) is provided at the bottom of the first end of the second bearing assembly (120), and an end of the first hinged portion (113) away from the first bearing assembly (110) and an end of the second hinged portion (123) away from the second bearing assembly (120) are hingedly connected so that a hinge center line is located at the bottom of the vehicle body; When unfolding, the end side wall of the first end of the first bearing component (110) and the end side wall of the first end of the second bearing component (120) can contact each other to limit the unfolding of the first bearing component (110) and the second bearing component (120); When folded, a storage space can be formed between the first carrying component (110) and the second carrying component (120).

3. The foldable stretcher trolley according to claim 2, characterized in that: The walking assembly comprises: A first caster (210) with a smaller diameter, which is a universal wheel, two first casters (210) are provided, and the two first casters (210) are respectively provided on both sides of the bottom of the second end of the first bearing assembly (110); A first mounting frame (220), a first end of which is connected to the first caster (210), and a second end of which is fixedly connected to the first bearing assembly (110), and the first mounting frame (220) is a retractable structure; Two second casters (230) with a larger diameter are provided, and the two second casters (230) are respectively provided on both sides of the bottom of the second end of the second bearing assembly (120); a second mounting frame (240), a first end of which is connected to the second caster (230) and a second end of which is hinged to the second bearing assembly (120), so that the second mounting frame (240) has a folded position and an unfolded position that can be switched to each other, and when the second mounting frame (240) is in the folded position, the second caster (230) is located at both ends of the storage space to protect the internal space of the storage space; and A second locking structure is arranged on the second mounting frame (240) and the second bearing assembly (120), and the second locking structure has a locking state and an unlocking state that can be switched with each other. When the second locking structure is in the locking state, the second locking structure can lock the second mounting frame (240) to lock the second mounting frame (240) in the unfolded position; when the second locking structure is in the unlocking state, the second locking structure releases the lock on the second mounting frame (240) to allow the second mounting frame (240) to swing back and forth between the folded position and the unfolded position.

4. The foldable stretcher trolley according to any one of claims 1 to 3, characterized in that: The cart further includes a position limiting assembly, which includes: a screw rod (510) rotatably disposed in the second bearing assembly (120); and a limiting element (520), which corresponds to the screw rod (510), the limiting element (520) being slidably connected to the second bearing assembly (120), the limiting element (520) being sleeved on the screw rod (510) and being threadedly connected to the screw rod (510); The limiting element (520) has a first position and a second position that can be switched between each other, and a limiting hole (114) that matches the limiting element (520) is correspondingly opened at the first end of the first supporting component (110). When the limiting element (520) is in the first position, the limiting element (520) retracts into the second supporting component (120), thereby separating the limiting element (520) from the limiting hole (114); when the limiting element (520) is in the second position, the limiting element (520) can be inserted into the limiting hole (114).

5. The foldable stretcher trolley according to claim 4, characterized in that: Two of the limit assemblies are provided, and the two limit assemblies are respectively provided on two sides of the second bearing assembly (120); The handle assembly comprises two first handles (410), the two first handles (410) respectively corresponding to the two screw rods (510), the first handle (410) being movably connected to the second bearing assembly (120), the first handle (410) being coaxially arranged with the screw rod (510), and the first end of the first handle (410) being sleeved with the power input end of the screw rod (510), the first handle (410) being slidably connected with the screw rod (510), so that the first handle (410) can drive the screw rod (510) to rotate, and at the same time, the first handle (410) can also switch between a folded position and an unfolded position along the axis of the screw rod (510); The cart also includes: a third locking component, which is arranged on the second bearing component (120) or the first bearing component (110), and the third locking component has a locked state and an unlocked state that can be switched between each other; Wherein, when the third locking assembly is in an unlocked state, the third locking assembly releases the lock on the limiting element (520), so that the limiting element (520) can reciprocate between the first position and the second position; When the third locking assembly is in a locked state, the third locking assembly can lock the limiting element (520) in the second position and lock the first handle (410) so that the first handle (410) cannot rotate; and a fourth locking component, which is arranged on the second bearing component (120), and the fourth locking component has a locked state and an unlocked state that can be switched between each other; Wherein, when the fourth locking assembly is in an unlocked state, the fourth locking assembly releases the lock on the first handle (410), so that the first handle (410) can be switched between a folded position and an unfolded position; When the fourth locking assembly is in a locked state, the fourth locking assembly can lock the first handle (410) in a folded position or an unfolded position.

6. The foldable stretcher trolley according to claim 5, characterized in that: The third locking assembly comprises: A third locking element (610), which is arranged in the second bearing assembly (120), the third locking element (610) is slidably connected to the second bearing assembly (120), the third locking element (610) has a locking position and an unlocking position that can be switched with each other, the third locking element (610) is provided with a third locking portion (611), and the limiting element (520) is correspondingly provided with a third locking socket (521) adapted to the third locking portion (611), when the limiting element (520) is in the second position, the third locking socket (521) corresponds to the third locking portion (611); A driving structure is arranged on the second bearing assembly (120), and is used to move the third locking element (610) from a locking position to an unlocking position or from an unlocking position to a locking position.

7. The foldable stretcher trolley according to claim 6, characterized in that: The driving structure comprises: a reel (621), which is disposed in the second bearing assembly (120), and the reel (621) is rotatably connected to the second bearing assembly (120); a pull rope (622) disposed in the second bearing assembly (120), wherein a first end of the pull rope (622) is fixedly connected to the third locking element (610) and a second end of the pull rope (622) is connected to the reel (621); a third elastic element (623), which is arranged in the second bearing assembly (120), wherein a first end of the third elastic element (623) is connected to the third locking element (610), and a second end is connected to the second bearing assembly (120), and in a natural state, the third elastic element (623) applies elastic force to the third locking element (610), so that the third locking element (610) has a tendency to move from an unlocked position to a locked position; and The knob (624) is rotationally connected to the second bearing assembly (120), and the power output shaft of the knob (624) is drivingly connected to the power input shaft of the reel (621).

8. The foldable stretcher trolley according to claim 7, characterized in that: The driving structure also includes: a limiting wheel (625), which is arranged in the second bearing assembly (120), the limiting wheel (625) being rotationally connected to the second bearing assembly (120), and the limiting wheel (625) being transmission-connected to the winding wheel (621); a limiting slider (626) disposed on one side of the limiting wheel (625), the limiting slider (626) being slidably connected to the second bearing assembly (120) so that the limiting slider (626) can reciprocate between a third position and a fourth position; The circumferential side wall of the limiting wheel (625) is provided with ratchet teeth (601), and the end of the limiting slider (626) facing the limiting wheel (625) is provided with ratchet teeth (602) matching with the ratchet teeth (601); When the limiting slider (626) is in the third position, the ratchet teeth (602) cooperate with the ratchet teeth (601) so that the limiting wheel (625) can only rotate along the first preset direction; When the limiting slider (626) is in the fourth position, the ratchet teeth (602) are separated from the ratchet teeth (601), so that the limiting wheel (625) can rotate in both the forward direction and the reverse direction; a scroll torsion spring, which is arranged at the rotation center of the limiting wheel (625), the two ends of the scroll torsion spring are respectively connected to the limiting wheel (625) and the second bearing assembly (120), and in a natural state, the scroll torsion spring applies elastic force to the limiting wheel (625) so that the limiting wheel (625) has a tendency to rotate along a second preset direction; a fifth elastic element (627), a first end of which is connected to the limit slider (626) and a second end of which is connected to the second bearing assembly (120); and in a natural state, the fifth elastic element (627) applies elastic force to the limit slider (626) so that the limit slider (626) has a tendency to move from the fourth position to the third position; A driving slider (628) slidably connected to the limiting slider (626) so that the driving slider (628) can be reciprocated between a fifth position and a sixth position; The side wall of the limiting element (520) is correspondingly provided with a driving portion (522) that cooperates with the driving slider (628); when the driving slider (628) is in the fifth position, the driving slider (628) can cooperate with the driving portion (522), so that the limiting element (520) can apply a force to the limiting slider (626) through the driving portion (522) and the driving slider (628), so as to drive the limiting slider (626) to move; When the driving slider (628) is in the sixth position, the driving slider (628) cannot cooperate with the driving portion (522), so that the limiting element (520) cannot apply a force to the limiting slider (626) through the driving slider (628); and driving inclined surfaces (603) are provided on both sides of one end of the driving slider (628) facing the limiting element (520), so that when the limiting slider (626) is in the third position and the fourth position, the limiting element (520) can apply a force to the driving slider (628) through the driving portion (522) and the driving inclined surfaces (603), so as to drive the driving slider (628) from the fifth position to the sixth position; and a sixth elastic element (629), a first end of which is connected to the driving slider (628) and a second end of which is connected to the limiting slider (626); and in a natural state, the sixth elastic element (629) applies elastic force to the driving slider (628) so that the driving slider (628) has a tendency to move from the sixth position to the fifth position; Wherein, the power output shaft of the knob (624) is drivingly connected to the power input shaft of the limiting wheel (625).

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