A stretcher bed getting on and off device and a stretcher bed with automatic getting on and off

Abstract

The present invention patent discloses a stretcher bed getting on and off device and an automatic getting on and off stretcher bed, comprising: a fixed frame, having a slide rail; a power mechanism, comprising a connected motor and a synchronous belt; a sliding frame; a transmission mechanism, comprising a connected fixed seat, a transmission shaft and a locking structure; the fixed frame has a trigger structure at one end in the extension direction of the slide rail, and in a first state, the synchronous belt can drive the transmission mechanism to move along the direction of the slide rail, and in a second state, the synchronous belt can drive the transmission shaft to rotate; and a conveying mechanism; the stretcher bed getting on and off device of the present patent has a compact structure and can automatically realize the switching of the motor output function without manual intervention. The getting on and off device will automatically complete the entire getting on and off action. The user only needs to disassemble or install the stretcher bed on the conveyor belt, which saves the time required for getting on and off the stretcher bed and simplifies the operation.

Description

Technical Field

[0001] The invention relates to the field of a stretcher and a stretcher conveying device, in particular to a stretcher getting on and off device and an automatic getting on and off stretcher. Background Art

[0002] At present, most ambulances need to be equipped with stretchers to realize the transfer of patients and temporary treatment in the ambulance. It is easy to cause injuries to the patient due to improper force when directly lifting the stretcher carrying the patient onto and off the ambulance. In the prior art, automatic up and down pulling devices are used to realize automatic loading and unloading of stretchers, but these loading and unloading devices often have too short a stroke and poor auxiliary effect. Therefore, whether there is a stretcher loading and unloading device with a large stroke that can realize automatic loading and unloading from the ground to the ambulance is a technical problem that technicians in this field are looking forward to solving. Summary of the invention

[0003] The purpose of the present invention is to provide a stretcher bed getting on and off device and an automatic getting on and off stretcher bed, which only needs to use one motor to provide power. By setting a matching locking structure and trigger structure, the output function of the motor is adjusted to achieve the switching of two power outputs of the sliding frame and the stretcher bed.

[0004] The technical solution provided by the present invention is as follows:

[0005] A stretcher bed getting on and off device, comprising:

[0006] A fixed frame having a slide rail;

[0007] A power mechanism, comprising a motor and a synchronous belt connected to each other, wherein the motor is fixed on the fixing frame, the motor is used to drive the synchronous belt, and the setting direction of the synchronous belt is the same as the direction of the slide rail;

[0008] A sliding frame, which can slide on the slide rail;

[0009] The transmission mechanism comprises a fixed seat, a transmission shaft and a locking structure connected to each other; the fixed seat is fixed on the sliding frame, and the synchronous belt is connected to the transmission shaft; one end of the fixed frame in the extension direction of the slide rail has a trigger structure, and the trigger structure is adapted to the locking structure.

[0010] In the first state, the trigger structure does not contact the locking structure, the transmission shaft is fixed to the fixing seat, and the synchronous belt can drive the transmission mechanism to move along the direction of the slide rail.

[0011] In the second state, the trigger structure interacts with the locking structure, the transmission shaft is rotatably connected to the fixing seat, and the synchronous belt can drive the transmission shaft to rotate; and,

[0012] The conveying mechanism comprises a conveying belt, wherein the conveying belt is connected to the transmission shaft, and the transmission shaft can drive the conveying belt.

[0013] In the first state, the relative positions of the transmission mechanism, the sliding frame, and the conveying mechanism are fixed, and the whole can slide on the slide rail relative to the fixed frame. When the sliding frame does not slide to the end close to the trigger structure, and the trigger structure fails to trigger the locking structure, the transmission mechanism is fixed to the synchronous belt. At this time, the motor moves, and the synchronous belt will move the sliding frame and other structures along the slide rail. The stretcher bed can be fixed on the conveyor belt. In this stage, the stretcher bed moves relative to the fixed frame.

[0014] In the first state, when the sliding frame moves to one end of the slide rail, the trigger structure triggers the locking structure, so that the transmission shaft can rotate with the synchronous belt. At this time, the positions of the transmission mechanism, the sliding frame and the conveying mechanism relative to the fixed frame remain unchanged, and only the conveying belt in the conveying mechanism rotates with the transmission shaft. In this stage, the stretcher bed moves relative to the sliding frame.

[0015] After setting up the matching trigger structure and locking structure, the same motor can be used to realize the movement of the two ends of the stretcher bed relative to the fixed frame and the stretcher bed relative to the sliding frame, so as to realize the automation of getting on and off the stretcher bed. The fixed frame can be fixed on the ambulance.

[0016] Further preferably, the locking structure comprises a first meshing member, a second meshing member, a limiting member and a reset member, the first meshing member is coaxially fixed with the transmission shaft; the second meshing member is sleeved on the transmission shaft and can slide on the transmission shaft, the first meshing member and the second meshing member can be meshed with teeth arranged in the circumferential direction of the transmission shaft, the limiting member provides the second meshing member with a limit in the circumferential direction of the transmission shaft, and the reset member provides the second meshing member with a limit in the axial direction of the transmission shaft;

[0017] The second engagement member has an inclined surface, and in the extension direction of the slide rail, the distance between the inclined surface and the radial cross section of the transmission shaft gradually increases;

[0018] The trigger structure is a guide post, and the guide post is adapted to the inclined surface;

[0019] In the first state, the first engagement member is engaged and fixed with the second engagement member;

[0020] In the second state, the guide post abuts against the inclined surface, so that the first engaging member and the second engaging member are moved away from each other.

[0021] In the first state, the first meshing member is meshed with the second meshing member. Since the second meshing member is limited by the limiting member, the second meshing member cannot rotate around the axis of the transmission shaft, so the transmission shaft is fixed by the first meshing member. In the second stage, the guide post abuts against the inclined surface, and part of the pressure of the guide post on the inclined surface along the slide rail direction is converted by the inclined surface into pressure on the second meshing member along the axial direction of the transmission shaft, so that the first meshing member and the second meshing member are disengaged from each other. At this time, the transmission shaft can rotate freely, and the transmission shaft will drive the conveying mechanism to operate.

[0022] Further preferably, the limiting member is a guide shaft, the guide shaft is fixed on a fixing seat in parallel with the transmission shaft, and the second engaging member is provided with a through hole matched with the guide shaft.

[0023] The second meshing member can slide on the guide shaft through the through hole, and the guide shaft plays an effective role in limiting the second meshing member. When the first meshing member and the second meshing member are fixed, the synchronous belt drives other structures such as the sliding frame through the friction between the synchronous belt and the transmission shaft, so there will be a large stress between the first meshing member and the second meshing member. The guide shaft can provide a large supporting force for the second meshing member, thereby improving the stability of the equipment.

[0024] Further preferably, the number of the guide shafts is two, and the two guide shafts are respectively located on both sides of the transmission shaft, so as to evenly disperse the stress on the second engaging member and improve the strength of the second engaging member.

[0025] Further preferably, the guide shaft has a third guide wheel, and the third guide wheel is used to press the synchronous belt onto the transmission shaft. The third guide wheel is used to increase the wrap angle between the synchronous belt and the transmission shaft, increase the friction between the synchronous belt and the transmission shaft, and avoid the synchronous belt slipping in the first state, resulting in the motor being unable to drive the sliding seat to move.

[0026] Further preferably, the transmission shaft has a first guide wheel and a second guide wheel, the first guide wheel is connected to the synchronous belt, the second guide wheel is connected to the conveyor belt, and the second guide wheel, the first guide wheel, the first meshing member and the second meshing member are arranged in sequence.

[0027] The first guide wheel outputs power to the transmission shaft. In the first state, the portion of the transmission shaft located between the first guide wheel and the first meshing member is subjected to greater stress. In the second state, the portion of the transmission shaft located between the first guide wheel and the second guide wheel is subjected to greater stress. The first guide wheel is located in the middle of the transmission shaft, which can make the stress conditions on both sides of the transmission shaft basically symmetrical during operation, avoid stress concentration at a certain point on the transmission shaft that may cause easy damage, and extend the life of the device.

[0028] Further preferably, both ends of the transmission shaft and a portion of the transmission shaft between the first guide wheel and the second guide wheel are respectively connected to the fixing seat via bearings.

[0029] The three guide wheels and the second meshing member can respectively support one end of the transmission shaft, between the second guide wheel and the first guide wheel, between the first guide wheel and the first meshing member, between the first meshing member and the other end of the transmission shaft, and the other end of the transmission shaft, thereby improving the overall strength of the transmission shaft, avoiding breakage of the transmission shaft, and extending the life of the transmission shaft.

[0030] Further preferably, the fixing seat is provided with a groove for the guide column to enter, so that the overall structure of the transmission mechanism is further integrated, its volume is reduced, and its weight is lightened.

[0031] Further preferably, the reset member is a spring, and when the guide column abuts against the inclined surface, the guide column provides pressure on the second engaging member to overcome the elastic force of the spring and move the second engaging member away from the first engaging member; when the guide column leaves the inclined surface, the elastic force of the spring causes the second engaging member to engage and fix with the first engaging member.

[0032] The limiting member will limit the second engaging member in directions other than the axial direction of the transmission shaft, so the spring only needs to provide limiting for the limiting member along the axial direction of the transmission shaft. The structure is simple and can achieve automatic resetting of the second engaging member.

[0033] A stretcher bed with automatic on-and-off function comprises a stretcher bed and a stretcher bed on-and-off device with the above-mentioned characteristics. The stretcher bed is detachably fixed to the conveyor belt.

[0034] This patent creatively arranges a matching synchronous belt and transmission mechanism on the stretcher bed getting on and off the device, and only uses one motor to realize two actions of the stretcher bed relative to the fixed frame and the stretcher bed relative to the sliding frame, and the structure is more compact; a matching locking structure and a trigger structure are arranged to realize automatic switching of the motor output function, and no human intervention is required. The getting on and off device will automatically complete the entire getting on and off action. The user only needs to disassemble or install the stretcher bed on the conveyor belt, which saves the time required for getting on and off the stretcher bed and simplifies the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0036] Figure 1 The device structure of a specific embodiment of the present invention is shown in FIG. Figure 1 ;

[0037] Figure 2 The device structure of a specific embodiment of the present invention is shown in FIG. Figure 2 ;

[0038] Figure 3It is a schematic diagram of the structure of the device when the trigger mechanism and the locking mechanism are in contact with each other according to a specific embodiment of the present invention;

[0039] Figure 4 It is a schematic diagram of the device structure of a specific embodiment of the present invention in which part of the sliding frame is omitted;

[0040] Figure 5 It is a schematic diagram of the structure of a device when the first engaging member and the second engaging member are engaged and fixed in a specific embodiment of the present invention;

[0041] Figure 6 It is a schematic diagram of the device structure when the first engaging member and the second engaging member are disengaged in a specific embodiment of the present invention.

[0042] Description of Figure Numbers:

[0043] 100-fixed frame; 110-slide rail; 120-trigger structure; 121-guide column; 200-power mechanism; 210-motor; 220-synchronous belt; 300-sliding frame; 400-transmission mechanism; 410-fixed seat; 411-groove; 420-transmission shaft; 421-first guide wheel; 422-second guide wheel; 430-locking structure; 431-first engaging member; 432-second engaging member; 433-limiting member; 434-resetting member; 435-tooth; 436-inclined surface; 437-third guide wheel; 500-conveying mechanism; 510-conveying belt; 600-stretcher bed; 610-connecting member. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] As a specific example, Figure 1-4 As shown, a stretcher bed getting on and off device includes a fixed frame 100, which can be fixed on an ambulance or other equipment; a power mechanism 200 arranged on the fixed frame 100, which is used to provide power for the getting on and off device; a sliding frame 300, on which a transmission mechanism 400 and a conveying mechanism 500 are installed. Under the drive of the power mechanism 200, the sliding frame 300 can drive the transmission mechanism 400 and the conveying mechanism 500 to move relative to the fixed frame 100, and the transmission mechanism 400 can also transmit power to the conveying mechanism 500.

[0046] like Figure 2 and Figure 3 As shown, a slide rail 110 is provided on the fixed frame 100, and the sliding frame 300 can slide on the slide rail 110 with other devices. In this patent, a plurality of pulleys are provided on the slide rail 110 to reduce the friction between the slide rail 110 and the sliding frame 300.

[0047] The power mechanism 200 includes a motor 210 and a synchronous belt 220 connected to each other. Figure 2-4 As shown, the motor 210 is fixed on the fixing frame 100 and remains stationary with the fixing frame 100. Figure 2 and Figure 4 As shown, the synchronous belt 220 is arranged along the extension direction of the slide rail 110. The synchronous belt 220 can drive the sliding frame 300 to run along the direction of the synchronous belt 220 through the transmission mechanism 400. Figure 2 This is a schematic diagram of the stretcher bed 600 when it is folded up. Figure 4 is a schematic diagram of the structure when the sliding frame 300 moves to one end of the fixed frame 100, Figure 2 and Figure 4 The changes between the device forms shown are the first state in which the motor 210 drives the transmission mechanism 400 , the sliding frame 300 and the stretcher bed 600 to slide along the direction of the slide rail 110 through the synchronous belt 220 .

[0048] like Figure 4 As shown, the transmission mechanism 400 is connected to the conveying mechanism 500, and the transmission mechanism 400 can drive the conveying belt 510 in the conveying mechanism 500 to operate. The conveying belt 510 is fixed with a connecting piece 610, and the connecting piece 610 is used to be detachably fixed to the stretcher bed 600. Figure 3 In the state shown, the power output by the power mechanism 200 is distributed by the transmission mechanism 400 to the conveyor belt 510 of the conveying mechanism 500, and the conveyor belt 510 drives the connecting member 610 and the stretcher bed 600 on the connecting member 610 to continue to expand outward. The motion state described at this time is the second state.

[0049] The switching between the first state and the second state is achieved by the trigger structure 120 on the fixing frame 100 and the locking structure 430 on the transmission mechanism 400 .

[0050] Figure 5 The figure shows a schematic diagram of the structure of the transmission mechanism 400 in the first state. The transmission mechanism 400 includes a fixed seat 410, a transmission shaft 420 and a locking structure 430. The fixed seat 410 is fixed on the sliding frame 300 to transmit the force along the slide rail 110 received by the transmission shaft 420 in the first state to the sliding frame 300, so as to drive the sliding frame 300. The fixed frame 100 is provided with a plurality of baffles. The transmission shaft 420 is rotatably connected with a plurality of baffles through bearings. The transmission shaft 420 has a first guide wheel 421 and a second guide wheel 422 fixed coaxially. Figure 4 It can be seen that the first guide wheel 421 is connected to the synchronous belt 220, and the second guide wheel 422 is connected to the conveyor belt 510. The limiting structure includes a first meshing member 431 and a second meshing member 432. The first meshing member 431 and the second meshing member 432 have teeth 435 in the circumferential direction of the transmission shaft 420, and can mesh with each other through the teeth 435. The first meshing member 431 is coaxially fixed with the transmission shaft 420, and a limiting member 433, i.e., two guide shafts, is arranged between the two baffles. The second meshing member 432 is sleeved on the transmission shaft 420, and the two guide shafts pass through the second meshing member 432. One end of the second meshing member 432 is connected to a reset member 434, i.e., a spring, and the other end of the reset member 434 is fixed to a baffle.

[0051] Figure 5 The second engagement member 432 is shown in the state of being engaged with the first engagement member 431. Figure 5 It can be seen that since the second engagement member 432 is limited by the limiting member 433 and cannot rotate, when the first engagement member 431 is engaged with the second engagement member 432, the second engagement member 432 fixes the transmission shaft 420 through the first engagement member 431, thereby limiting the transmission shaft 420. The synchronous wheel passes through the first guide wheel 421 and is pressed against the surface of the first guide wheel 421 by the third guide wheel 437 on the guide shaft. The synchronous belt 220 and the transmission shaft 420 have a large wrap angle, so that the synchronous belt 220 will not slip with the transmission shaft 420. At this time, when the synchronous belt 220 is in operation, the entire transmission mechanism 400 can only run with the synchronous belt 220 because the transmission shaft 420 cannot rotate, and the fixed seat 410 is fixed to the sliding frame 300. Therefore, at this time, the output power of the motor 210 is used to drive the sliding frame 300 and the structure fixed thereto to move along the direction of the slide rail 110.

[0052] like Figure 3 As shown, in the first state, when the sliding frame 300 moves to one end close to the trigger structure 120, the trigger structure 120 contacts the locking structure 430, and the structural schematic diagram of the trigger structure 120 and the locking structure 430 is as follows: Figure 6 .according to Figure 6It can be seen that the trigger structure 120 has a guide post 121, and at this time the guide post 121 extends into the groove 411 of the fixing seat 410, and one side of the guide post 121 abuts against the inclined surface 436 of the second engagement member 432. The inclined surface 436 converts part of the pressure of the guide post 121 on the inclined surface 436 into a force along the axial direction of the transmission shaft 420, so that the second engagement member 432 overcomes the elastic force of the spring and moves in a direction away from the first engagement member 431. This state is the second state, and the second engagement member 432 will not limit the first engagement member 431, and the transmission shaft 420 can be freely transmitted. In the second state, the motor 210 drives the synchronous belt 220 to continue rotating, and the synchronous belt 220 will transmit the transmission shaft 420 through the first guide wheel 421. The transmission shaft 420 drives the conveyor belt 510 of the conveying mechanism 500 through the second guide wheel 422 to start working. The conveyor belt 510 is fixed to the stretcher bed 600 through the connecting piece 610, and the stretcher bed 600 continues to be transported outward until it is transported to a detachable area such as the bottom surface.

[0053] At this point, a person skilled in the art can understand that the transmission mechanism 400 and the trigger structure 120 in this patent are actually the key invention points of this patent. In this specific embodiment, the third guide wheel 437 is set on the guide shaft through a bearing, which is conducive to reducing the space occupied by the entire device. In actual production, the guide wheel and the limit member 433 can be set separately. The trigger structure 120 and the locking structure 430 interact with each other to realize the conversion of the output function of the motor 210. When only the same motor 210 is used, the movement of the stretcher 600 relative to the fixed frame 100 and the stretcher 600 relative to the sliding frame 300 are realized. Two stages of movement of the stretcher 600 are set. The user only needs to disassemble or install the stretcher 600 and the connecting member 610, and the boarding and disembarking device will automatically complete the entire lifting and lowering of the stretcher. Compared with manual handling, the motor 210 drive can keep the stretcher 600 stable during the boarding and disembarking process, improving the user's comfort.

[0054] The position-limiting member 433 includes two guide shafts, which support the second meshing member 432 from both sides. In the first state, there is a large stress between the first meshing member 431 and the second meshing member 432. The two guide shafts can effectively disperse the stress on the second meshing member 432, improve the strength of the device, and extend the life of the device. The second meshing member 432 is provided with a through hole for the guide shaft to pass through. In actual production, the position-limiting member 433 can adopt other commonly used structures, and the through hole can be kept or eliminated on the second meshing member 432 accordingly. When the position-limiting member 433 adopts a guide shaft, the number of guide shafts can also be increased or decreased according to the output power of the motor 210. A proximity switch can be provided on the slide rail 110 to prompt the control device of the operating status of the boarding and disembarking device. The control device can select a suitable output power according to the status of the boarding and disembarking device to improve the comfort of the patient.

[0055] After the stopper 433 is provided, the second engagement member 432 only has the degree of freedom of movement along the direction of the transmission shaft 420, and will not rotate or deflect. Therefore, the reset member 434 can use a spring with relatively low strength, and the overall structure of the device is simple, which is conducive to reducing the volume of the transmission mechanism 400. In actual production, the reset member 434 can use other common structures such as telescopic rods. The fixed seat 410 is provided with a groove 411 for the guide column 121 to enter, so that the inclined surface 436 of the second engagement member 432 can be provided on the fixed seat 410 without protruding outside the fixed seat 410, reducing the size of the transmission mechanism 400 in the direction of the slide rail 110, and increasing the sliding range of the sliding frame 300.

[0056] like Figure 2 As shown, in this specific embodiment, the motor 210 is connected to the synchronous belt 220 through a belt drive structure, which can reduce the size of the device in the lateral direction of the guide rail. In actual production, the output end of the motor 210 can be directly connected to the synchronous belt 220 through a guide wheel.

[0057] like Figure 5 and Figure 6 As shown, in the extension direction of the transmission shaft 420, the second guide wheel 422, the first guide wheel 421, the first engaging member 431, the second engaging member 432 and the reset member 434 are arranged in sequence, and the end of the transmission shaft 420 close to the second guide wheel 422, the end of the transmission shaft 420 between the second guide wheel 422 and the first guide wheel 421, and the end of the transmission shaft 420 away from the second guide wheel 422 are respectively fixed to the three baffles through bearings, and cooperate with the limiting member 433 with a limiting function. The transmission mechanism 400 has a higher strength as a whole, and the transmission shaft 420 is supported by multiple sections and is not easy to break.

[0058] In the first state, the first guide wheel 421 is subjected to a large friction force, which forms a large stress between the first meshing member 431 and the second meshing member 432. At this time, the stress of the end of the transmission shaft 420 close to the first meshing member 431 is concentrated. In the second state, the first guide wheel 421 is still subjected to a large friction force, and the work output by the motor 210 is transmitted to the conveyor belt 510 through the second guide wheel 422. At this time, the second guide wheel 422 is subjected to a large friction force, and the stress of the end of the transmission shaft 420 close to the second guide wheel 422 is concentrated. That is, after the first state and the second state are switched, the stress distribution on the transmission shaft 420 is basically symmetrical. In the first state, the stress of the end of the transmission shaft 420 close to the second guide wheel 422 is small, and in the second state, the stress of the end of the transmission shaft 420 close to the first meshing member 431 is small, which can prevent a part of the transmission shaft 420 from being easily damaged due to the constant concentration of gravity. In actual production, the arrangement order of the first guide wheel 421, the second guide wheel 422, the first engaging member 431, the second engaging member 432 and the reset member 434 can be adjusted, and the adjusted schemes are all within the protection scope of this patent.

[0059] The present invention provides a specific implementation of an automatic loading and unloading stretcher bed, such as Figure 1-4 As shown, it includes a stretcher 600 and a stretcher getting on and off device having the aforementioned features.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A stretcher bed getting on and off device, characterized in that: include: A fixed frame having a slide rail; A power mechanism, comprising a motor and a synchronous belt connected to each other, wherein the motor is fixed on the fixing frame, the motor is used to drive the synchronous belt, and the setting direction of the synchronous belt is the same as the direction of the slide rail; A sliding frame, which can slide on the slide rail; The transmission mechanism comprises a fixed seat, a transmission shaft and a locking structure connected to each other; the fixed seat is fixed on the sliding frame, and the synchronous belt is connected to the transmission shaft; The fixing frame has a trigger structure at one end in the extension direction of the slide rail, and the trigger structure is adapted to the locking structure. In the first state, the trigger structure does not contact the locking structure, the transmission shaft is fixed to the fixing seat, and the synchronous belt can drive the transmission mechanism to move along the direction of the slide rail. In the second state, the trigger structure interacts with the locking structure, the transmission shaft is rotationally connected to the fixing seat, and the synchronous belt can drive the transmission shaft to rotate; as well as, The conveying mechanism comprises a conveying belt, wherein the conveying belt is connected to the transmission shaft, and the transmission shaft can drive the conveying belt.

2. The stretcher bed getting on and off device according to claim 1, characterized in that: The locking structure includes a first meshing member, a second meshing member, a limiting member and a reset member, wherein the first meshing member is coaxially fixed with the transmission shaft; the second meshing member is sleeved on the transmission shaft and can slide on the transmission shaft, the first meshing member and the second meshing member can be meshed with teeth arranged in the circumferential direction of the transmission shaft, the limiting member provides the second meshing member with a limit in the circumferential direction of the transmission shaft, and the reset member provides the second meshing member with a limit in the axial direction of the transmission shaft; The second engagement member has an inclined surface, and in the extension direction of the slide rail, the distance between the inclined surface and the radial cross section of the transmission shaft gradually increases; The trigger structure is a guide post, and the guide post is adapted to the inclined surface; In the first state, the first engagement member is engaged and fixed with the second engagement member; In the second state, the guide post abuts against the inclined surface, so that the first engaging member and the second engaging member are moved away from each other.

3. The stretcher bed getting on and off device according to claim 2, characterized in that: The limiting member is a guide shaft, and the guide shaft is fixed on a fixing seat in parallel with the transmission shaft. The second engaging member is provided with a through hole matched with the guide shaft.

4. The stretcher bed getting on and off device according to claim 3, characterized in that: The number of the guide shafts is two, and the two guide shafts are respectively located on both sides of the transmission shaft.

5. The stretcher bed getting on and off device according to claim 3, characterized in that: The guide shaft is provided with a third guide wheel, and the third guide wheel is used to press the synchronous belt onto the transmission shaft.

6. The stretcher bed getting on and off device according to claim 2, characterized in that: The transmission shaft is provided with a first guide wheel and a second guide wheel, the first guide wheel is connected to the synchronous belt, the second guide wheel is connected to the conveyor belt, and the second guide wheel, the first guide wheel, the first meshing member and the second meshing member are arranged in sequence.

7. The stretcher bed getting on and off device according to claim 6, characterized in that: Both ends of the transmission shaft and a portion of the transmission shaft between the first guide wheel and the second guide wheel are respectively connected to the fixing seat through bearings.

8. The stretcher bed getting on and off device according to claim 2, characterized in that: The fixing seat is provided with a groove for the guide column to enter.

9. The stretcher bed getting on and off device according to claim 2, characterized in that: The reset member is a spring. When the guide post abuts against the inclined surface, the guide post provides pressure on the second engaging member to overcome the elastic force of the spring and move the second engaging member away from the first engaging member; when the guide post leaves the inclined surface, the elastic force of the spring causes the second engaging member to engage and fix with the first engaging member.

10. An automatic on-and-off stretcher bed, characterized in that: It comprises a stretcher and a stretcher getting on and off device according to any one of claims 1 to 9, and the stretcher is detachably fixed to the conveyor belt.

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