Back transfer mechanism, transfer wheelchair and transfer method

Abstract

The invention belongs to the technical field of transfer wheelchairs, and particularly relates to a back transfer mechanism, a transfer wheelchair and a transfer method. The transfer wheelchair comprises a rack and a hip transfer mechanism installed on the rack. The back transfer mechanism and the leg mechanism are rotationally mounted with the hip transfer mechanism; the foot mechanism is rotationally connected with the leg mechanism; the back transferring mechanism comprises a back support and a back driving mechanism installed at the upper end of the back support. The back driving roller and the back driven roller are mounted on two sides of the back bracket; the back driven roller and the back driving roller are in transmission connection through a back annular transfer belt; and at least one first anti-jamming device. The first belt clamping prevention device is arranged on the back transfer mechanism with the largest stress when the human body lies flat, the first belt clamping prevention device without a power source passively rotates along with the back annular transfer belt, and the belt clamping problem caused by large friction force due to direct contact between the transfer belt and the support under the gravity effect of the human body is completely avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of transfer wheelchairs, and in particular relates to a back transfer mechanism, a transfer wheelchair and a transfer method. Background Art

[0002] In most hospital wards, when transferring disabled patients, post-operative patients, patients with bedsores or burns, at least 1-2 family members or nurses are required to assist the doctor. This not only wastes medical resources, but also is dangerous and can cause secondary injuries to patients during the transfer process. For example, for patients with extensive burns, fractures, etc., the hands of family members or nurses must come into contact with the patients during the transfer process, which can easily cause skin or bone damage to the patients.

[0003] Existing transfer wheelchairs mostly use a power source to drive a conveyor belt for direct transfer. When a patient lies on the transfer wheelchair, the friction between the conveyor belt and the wheelchair frame increases under the action of the patient's own gravity, resulting in low transfer efficiency and even a stuck belt, making it impossible to rotate the patient normally. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art that the belt can get stuck and the patient cannot be transported, and to provide a back transport mechanism, a transport wheelchair and a transport method that can completely avoid the phenomenon of the belt getting stuck.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] In a first aspect, a back transport mechanism comprises:

[0007] Back support;

[0008] a back driving mechanism mounted on the upper end of the back support;

[0009] A back active roller and a back driven roller are installed on both sides of the back bracket; the back active roller is connected to the output end of the back driving mechanism through a first transmission mechanism; the back driven roller is connected to the back active roller through a back annular transfer belt;

[0010] And at least one first anti-stuck device is arranged in the annular cavity of the back circular conveyor belt, the first anti-stuck device includes two first anti-stuck rollers arranged on both sides of the back bracket and a first anti-stuck annular belt wound on the two first anti-stuck rollers; a plurality of first transmission teeth are arranged on the inner side surface of the back circular conveyor belt along the Z-axis direction; a plurality of second transmission teeth that cooperate with the first transmission teeth are arranged on the outer side surface of the first anti-stuck annular belt, and the back bracket is arranged in the annular cavity of the first anti-stuck annular belt.

[0011] Specifically, the back driving mechanism includes a first mounting frame installed at the end of the back bracket, a back transfer motor installed on the first mounting frame, a back driving gear coaxially arranged with the output shaft of the back transfer motor, and a back driven gear meshed and connected with the back driving gear;

[0012] The first transmission mechanism includes a first transmission pulley installed at the upper end of the back bracket and a second transmission pulley coaxially arranged with the upper end of the back driving roller; the first transmission pulley is coaxially arranged with the back driven gear, and the first transmission pulley and the second transmission pulley are connected by a first transmission belt.

[0013] Specifically, three first anti - jamming belt devices are provided, and the three first anti - jamming belt devices are arranged side by side in the Z - axis direction.

[0014] At least two back toothed pulleys are arranged on both the back driving roller and the back driven roller, and the back toothed pulleys are in transmission cooperation with the first transmission teeth on the outer side of the back annular transfer belt.

[0015] Specifically, the back bracket includes a frame body, a plurality of cross beams and a plurality of longitudinal beams fixedly arranged inside the frame body; the inner side surface of the first anti - jamming annular belt is a smooth surface and is in clearance fit with the cross beams and the longitudinal beams.

[0016] In a second aspect, a transfer wheelchair with high transfer stability includes a frame, a hip transfer mechanism installed on the frame, a leg mechanism rotatably installed with the hip transfer mechanism, a foot mechanism rotatably connected with the leg mechanism, and a back transfer mechanism as described above rotatably connected with the hip transfer mechanism.

[0017] Specifically, the hip transfer mechanism includes a hip bracket installed on the frame, a hip driving mechanism installed on the hip bracket, a first hip transfer assembly whose output end is in transmission connection with the hip driving mechanism through a second transmission mechanism, and a second hip transfer assembly in transmission connection with the first hip transfer assembly through a third transmission mechanism;

[0018] Second anti - jamming belt devices are arranged in both the first hip transfer assembly and the second hip transfer assembly.

[0019] Specifically, the leg mechanism includes:

[0020] A leg bracket rotatably connected with the hip bracket;

[0021] A leg driving mechanism installed at the lower end of the leg bracket;

[0022] The leg driving roller and the leg driven roller; the leg driving roller is in transmission connection with the leg driving mechanism through a fifth transmission assembly, and the leg driving roller and the leg driven roller are in transmission connection through a leg transfer annular belt;

[0023] The third anti-jamming belt device is arranged in the annular cavity of the leg transfer annular belt.

[0024] Specifically, the foot mechanism includes:

[0025] A foot support rotatably connected to the leg mechanism;

[0026] A footrest arranged on the foot support.

[0027] Specifically, it further includes an attitude transformation device for transforming the transfer wheelchair into a sitting attitude, a semi-reclining attitude, and a reclining attitude; the attitude transformation device includes a back transformation mechanism, a leg transformation mechanism, and a foot-leg linkage assembly.

[0028] Specifically, the foot-leg linkage assembly includes:

[0029] An L-shaped connecting rod fixedly installed at the upper end of the foot support and an S-shaped connecting rod rotatably connected to the L-shaped connecting rod; one end of the S-shaped connecting rod away from the L-shaped connecting rod is rotatably installed at the upper end of the leg support.

[0030] In a third aspect, according to the transfer method of the transfer wheelchair with high transfer stability described above, it includes the following:

[0031] The patient sits on the transfer wheelchair;

[0032] Control the attitude transformation device to transform the transfer wheelchair into a reclining attitude;

[0033] Determine the transfer direction according to actual needs; the transfer direction includes left-side transfer and right-side transfer;

[0034] According to the transfer direction, simultaneously start the hip transfer mechanism, the back transfer mechanism, and the leg mechanism in the same direction;

[0035] The hip transfer mechanism, the back transfer mechanism, and the leg mechanism drive the patient to transfer in the specified transfer direction until the patient completely moves out of the transfer wheelchair.

[0036] The beneficial effects of the back transfer mechanism, the transfer wheelchair, and the transfer method of the present invention are:

[0037] The back transfer mechanism of the present invention uses a back driving roller, a back driven roller and a back annular transfer belt to realize the transfer of the left and right sides of the human body. A first anti-strap device is provided on the back transfer mechanism where the force is the greatest when the human body lies flat. The first anti-strap device is arranged in the annular cavity of the back annular transfer belt and covers the outside of the back bracket. Through the cooperation of the first transmission gear and the second transmission gear, the first anti-strap device without a power source follows the passive rotation of the back annular transfer belt, increasing the contact area between the support member and the transfer belt, reducing the wear degree and playing a role in strengthening the support force. It avoids the problem of belt jamming caused by large friction when the transfer belt directly contacts the bracket under the action of the human body gravity. The back annular transfer belt of the present invention does not directly contact the back bracket, and uses the passive rotation of the first anti-strap device to change the point contact between the transfer belt and the bracket under the action of the human body gravity to surface contact, completely solving the problem of large friction between the transfer belt and the bracket, avoiding the belt jamming phenomenon during the transfer process, and ensuring the stability and efficiency of the transfer.

[0038] Moreover, the present invention also provides corresponding anti-strap devices in the hip transfer mechanism and the leg mechanism to assist the back transfer mechanism in more stable transfer of the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0040] Figure 1 It is the first perspective three-dimensional view of the transfer wheelchair in the embodiment of the present invention.

[0041] Figure 2 It is the second perspective three-dimensional view of the transfer wheelchair in the embodiment of the present invention.

[0042] Figure 3 It is the partial structural schematic diagram of the transfer wheelchair in the embodiment of the present invention.

[0043] Figure 4 It is the internal structural schematic diagram of the back transfer mechanism in the embodiment of the present invention.

[0044] Figure 5 It is the partial structural schematic diagram of the back transfer mechanism in the embodiment of the present invention.

[0045] Figure 6 It is the structural schematic diagram of the hip transfer mechanism in the embodiment of the present invention.

[0046] Figure 7 It is the internal structural schematic diagram of the hip transfer mechanism in the embodiment of the present invention.

[0047] Figure 8 It is the mechanism schematic diagram of the leg transfer mechanism in the embodiment of the present invention.

[0048] Figure 9 It is a schematic structural diagram of the leg transformation mechanism according to an embodiment of the present invention.

[0049] Figure 10 It is a schematic structural diagram of the moving mechanism according to an embodiment of the present invention.

[0050] Figure 11 It is a flowchart of the transfer method of the transfer wheelchair according to an embodiment of the present invention.

[0051] In the figure: 1, frame; 2, hip transfer mechanism, 21, hip frame, 22, hip drive mechanism, 23, second transmission mechanism, 24, first hip transfer component, 25, third transmission mechanism, 26, second hip transfer component, 261, first hip transfer roller, 262, second hip transfer roller, 263, hip transfer endless belt, 27, partition device, 28, second anti-jamming belt device, 281, hip support, 282, second anti-jamming roller, 283, third transmission gear, 284, fourth transmission gear, 285, second anti-jamming endless belt; 3, back transfer mechanism, 31, back bracket, 32, back drive mechanism, 321, first mounting bracket, 322, back transfer motor, 323, back driving gear, 324, back driven gear, 33, back driving roller, 34, back driven roller, 35, first transmission mechanism, 351, first belt pulley, 352, second belt pulley, 353, first transmission belt, 36, back endless transfer belt, 37, first anti-jamming belt device, 371, first anti-jamming roller, 372, first anti-jamming endless belt, 373, first transmission gear, 375, second transmission gear, 38, back toothed belt pulley; 4, leg mechanism, 41, leg bracket, 42, leg drive mechanism, 43, leg driving roller, 45, leg transfer endless belt, 46, third anti-jamming belt device; 5, foot mechanism, 51, foot bracket, 52, footrest; 6, attitude transformation device, 61, back transformation mechanism, 611, U-shaped bracket, 612, armrest tube, 613, back transformation push rod, 614, back air spring, 62, leg transformation mechanism, 621, second bracket, 622, lower shaft bracket, 623, leg transformation push rod, 624, leg transformation plate, 625, support frame, 63, foot-leg linkage component, 631, L-shaped connecting rod, 632, S-shaped connecting rod; 7, moving mechanism, 71, front universal wheel, 72, "∫"-shaped connecting frame, 73, power conversion component, 731, conversion stepped cross beam, 732, fine-tuning connecting frame, 733, fine-tuning long hole, 734, power conversion push rod, 74, rear universal wheel, 75, power wheel; 8, armrest; 9, sponge. Detailed implementation manners

[0052] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0053] like Figures 1 - 10 The specific embodiment of a transport wheelchair with high transport stability of the present invention shown in the figure includes a frame 1, a hip transport mechanism 2 installed on the frame 1; a back transport mechanism 3 rotatably installed with the hip transport mechanism 2, and a leg mechanism 4; and a foot mechanism 5 rotatably connected with the leg mechanism 4; the back transport mechanism 3 includes: a back support 31, a back driving mechanism 32 installed at the upper end of the back support 31, a back active roller 33 and a back driven roller 34 installed on both sides of the back support 31, and at least one first anti-stuck device 37, wherein the back active roller 33 is connected to the output end of the back driving mechanism 32 through a first transmission mechanism 35; the back driven roller 34 is connected to the back active roller 33 through a back circular transport belt 36.

[0054] The first anti-stuck device 37 is arranged in the annular cavity of the back annular conveyor belt 36. The first anti-stuck device 37 includes two first anti-stuck rollers 371 arranged on both sides of the back support 31 and a first anti-stuck annular belt 372 rolled on the two first anti-stuck rollers 371; a plurality of first transmission teeth 373 are arranged on the inner side surface of the back annular conveyor belt 36 along the Z-axis direction; a plurality of second transmission teeth 375 that cooperate with the first transmission teeth 373 are arranged on the outer side surface of the first anti-stuck annular belt 372, and the back support 31 is arranged in the annular cavity of the first anti-stuck annular belt 372. In this embodiment, Figure 1 The coordinate system marked in is the reference coordinate system.

[0055] like Figure 4 and Figure 5 As shown, the back transfer mechanism 3 of this embodiment utilizes the back active roller 33, the back driven roller 34 and the back annular transfer belt 36 to realize the transfer of the left and right sides of the human body. The first anti-stuck device 37 is arranged on the back transfer mechanism 3 where the force is the greatest when the human body lies flat. The first anti-stuck device 37 is arranged in the annular cavity of the back annular transfer belt 36 and is covered on the outer side of the back bracket 31. Through the cooperation of the first transmission tooth 373 and the second transmission tooth 375, the first anti-stuck device 37 without a power source follows the passive rotation of the back annular transfer belt 36, which completely avoids the problem of jamming caused by the large friction force caused by the direct contact between the transfer belt and the bracket under the action of human body gravity. The back annular transfer belt 36 of the present invention does not directly contact the back bracket 31, and utilizes the passive rotation of the first anti-stuck device 37 to completely solve the problem of large friction between the transfer belt and the bracket, completely avoids the jamming phenomenon during the transfer process, and ensures the stability and efficiency of the transfer.

[0056] like Figure 4As shown in the figure, the back driving mechanism 32 in this embodiment includes a first mounting bracket 321 mounted at the end of the back bracket 31, a back transfer motor 322 mounted on the first mounting bracket 321, a back driving gear 323 coaxially arranged with the output shaft of the back transfer motor 322, and a back driven gear 324 meshed with the back driving gear 323. The first transmission mechanism 35 includes a first belt pulley 351 mounted at the upper end of the back bracket 31 and a second belt pulley 352 coaxially arranged with the upper end of the back driving roller 33; the first belt pulley 351 is coaxially arranged with the back driven gear 324, and the first belt pulley 351 and the second belt pulley 352 are drivingly connected by a first transmission belt 353.

[0057] During use, start the back transfer motor 322 to drive the back driving gear 323 to rotate, and then drive the back driven gear 324, the first belt pulley 351, and the second belt pulley 352 to rotate. The second belt pulley 352 drives the back driving roller 33 to rotate. Under the action of the back annular transfer belt 36, the rotation of the back driven roller 34 is driven, thereby realizing the transfer of the patient's back.

[0058] To achieve the transfer stability of the back annular transfer belt 36, at least two back toothed belt pulleys 38 are provided on both the back driving roller 33 and the back driven roller 34 of this embodiment. The back toothed belt pulleys 38 are in driving cooperation with the first transmission teeth 373 on the outer side surface of the back annular transfer belt 36 to prevent the back annular transfer belt 36 from slipping during rotation.

[0059] As we know, when the human body is lying flat, the center of gravity of the whole human body is distributed on the back. A first anti-jamming belt device 37 is provided on the back, which effectively improves the transfer stability of the transfer chair. Specifically, when the back annular transfer belt 36 rotates on the back driving roller 33 and the back driven roller 34, the first anti-jamming belt device 37 is arranged in the annular cavity of the back annular transfer belt 36, and the back bracket 31 is arranged in the annular cavity of the first anti-jamming annular belt 372. The three form a three-layer covering structure. Through the cooperation of the first transmission teeth 373 and the second transmission teeth 375, the first anti-jamming belt device 37 without a power source follows the back annular transfer belt 36 to rotate passively, changing the point contact between the transfer belt and the bracket under the action of human gravity to surface contact, and avoiding the jamming problem caused by the large friction when the transfer belt and the bracket directly contact under the action of human gravity. It should be further noted that the back bracket 31 in this embodiment includes a frame body, a plurality of cross beams and a plurality of longitudinal beams fixedly arranged inside the frame body; the inner side surface of the first anti-jamming annular belt 372 is a smooth surface and has a clearance fit with the cross beams and longitudinal beams. The back bracket 31 can not only play a supporting role for the human body, but also avoid the problem of large friction with the transfer annular belt.

[0060] As a preferred implementation, three first anti-jamming devices 37 are provided in this embodiment, and the three first anti-jamming devices 37 are arranged side by side along the Z-axis direction. The back annular transfer belt 36 is made of one or more spliced belts, and the design is optimized according to the requirements of the back size. No absolute limitation is made here.

[0061] like Figure 6 and Figure 7 As shown, the hip transfer mechanism 2 in this embodiment includes a hip frame 21 installed on the frame 1, a hip driving mechanism 22 installed on the hip frame 21, a first hip transfer component 24 that is transmission-connected to the output end of the hip driving mechanism 22 via a second transmission mechanism 23, and a second hip transfer component 26 that is transmission-connected to the first hip transfer component 24 via a third transmission mechanism 25. A second anti-stuck device 28 is provided in both the first hip transfer component 24 and the second hip transfer component 26.

[0062] Specifically, the first buttocks transport assembly 24 and the second buttocks transport assembly 26 both include: a first buttocks transport roller 261 and a second buttocks transport roller 262 symmetrically arranged on the buttocks frame 21 along the Y-axis direction; and a buttocks transport annular belt 263 wound on the first buttocks transport roller 261 and the second buttocks transport roller 262. The second anti-stuck device 28 is arranged in the annular cavity of the corresponding buttocks transport annular belt 263, and the second anti-stuck device 28 includes: a buttocks support 281 arranged inside the first transport assembly or the second transport assembly, two second anti-stuck rollers 282, a second anti-stuck annular belt 285, and a plurality of third transmission teeth 283. Specifically, the two second anti-stuck rollers 282 are rotatably mounted on both sides of the leg support, the second anti-stuck annular belt 285 is wound between the two second anti-stuck rollers 282, and a plurality of third transmission teeth 283 are arranged on the inner side of the buttocks transport annular belt 263 along the Y-axis direction, and the outer side of the second anti-stuck annular belt 285 is provided with a fourth transmission tooth 284 that cooperates with the third transmission tooth 283. Its working process is consistent with the first anti-stuck device 37 described above, and will not be elaborated here.

[0063] It should be further explained that, in this embodiment, a toilet cavity for facilitating the patient's toileting is provided between the first buttocks transport assembly 24 and the second buttocks transport assembly 26, and a blocking device 27 for blocking the toilet cavity is installed on the frame 1. The blocking swing device comprises: a support frame fixedly mounted on the frame 1, a first bracket fixedly mounted on the support frame, a first swinging small frame rotatably mounted on the first bracket, and a blocking swing push rod, one end of the blocking swing push rod is rotatably mounted on the first bracket, and the other end of the blocking swing push rod is rotatably mounted with a blocking assembly; the lower end of the blocking assembly is rotatably connected to the buttocks frame 21.

[0064] In detail, the barrier assembly includes a seat plate swing frame rotatably mounted with the buttock frame 21, at least two passive rotating rollers, a passive transfer belt, and a swing support plate. As a preferred embodiment, four passive rotating rollers are arranged on the seat plate swing frame along the Y-axis direction, and the passive transfer belt is sleeved on the passive rotating rollers; the swing support plate is fixedly mounted on the lower end surface of the seat plate swing frame, and a gap for the passive transfer belt to pass through is arranged between the swing support plate and the seat plate swing frame.

[0065] When the transfer action is performed, the barrier swing push rod is in an extended state, so that the barrier assembly is filled in the toilet cavity, and the passive transfer belt in the barrier assembly is flush with the hip transfer annular belt 263 in the first hip transfer assembly 24 and the second hip transfer assembly 26 on the horizontal plane. When the side action is performed, the barrier swing push rod is in a retracted state, and the barrier swing push rod pulls the barrier assembly to rotate downward relative to the lower end of the hip frame 21 until the barrier assembly is completely rotated out of the space corresponding to the toilet cavity. The setting of the barrier device 27 not only meets the transfer action, but also facilitates the patient's toilet action for the rotation of the human body. And the barrier assembly is rotated forward and pulled open, which is convenient for the transfer chair to enter the toilet from the back, with a reasonable design and simple structure.

[0066] It should be further explained that the partition swing push rod in this embodiment is rotatably installed with the first swing frame and the first bracket below, and the first bracket is installed on the support frame, so that the partition swing push rod has a smaller fine-tuning displacement when converting the transport action and the toilet action, so that the transport action and the toilet action can be converted. The contraction of the partition swing push rod has a certain buffer space, and the action conversion is relatively smooth, giving the patient time to adapt.

[0067] like Figure 8 As shown, the leg mechanism 4 in this embodiment includes a leg bracket 41 rotatably connected to the hip frame 21, a leg driving mechanism 42, a leg active roller 43 and a leg driven roller, and a third anti-stuck device 46. Specifically, the leg driving mechanism 42 is installed at the lower end of the leg bracket 41, the leg active roller 43 is transmission-connected to the leg driving mechanism 42 through the fifth transmission assembly, and the leg active roller 43 and the leg driven roller are transmission-connected through the leg transfer annular belt 45, and the third anti-stuck device 46 is arranged in the annular cavity of the leg transfer annular belt 45.

[0068] The leg drive mechanism 42 is installed at the lower end of the leg bracket 41. The leg drive mechanism 42 has the same structure as the back drive mechanism 32, and its specific structure will not be elaborated here in detail. The structure and operating principle of the third anti - jam belt device 46 are the same as those of the first anti - jam belt device 37, and will not be elaborated here either. It should be understood that those skilled in the art should be able to adaptively install the leg drive mechanism 42 and the anti - jam belt device according to specific requirements. The present invention also has corresponding anti - jam belt devices provided in the hip transfer mechanism 2 and the leg mechanism 4 to assist the back transfer mechanism 3 in more stable transfer of the human body.

[0069] It should be further noted that sponge bodies 9 are pasted on the outer layers of the back transfer mechanism, hip transfer mechanism, and leg transfer mechanism in this embodiment. On the one hand, it divides the patient's weight, and on the other hand, it improves the comfort of the patient.

[0070] As Figure 9 shown, the foot mechanism 5 in this embodiment includes a foot bracket 51 rotatably connected to the leg mechanism 4 and a footrest 52 provided on the foot bracket 51. It should be further noted that considering that when the human body lies flat, the force on the feet is very small, the foot mechanism 5 in this embodiment does not have a transfer function, and when the wheelchair function is performed, it ensures the stability of the patient's feet.

[0071] It should be understood that the transfer wheelchair in this embodiment further includes an attitude transformation device 6 for transforming the transfer wheelchair between a sitting attitude, a semi - lying attitude, and a lying attitude. The attitude transformation device 6 includes a back transformation mechanism 61, a leg transformation mechanism 62, and a foot - leg linkage component 63.

[0072] Among them, the back transformation mechanism 61 includes U - shaped brackets 611 installed on both sides of the back transfer mechanism 3 and an armrest tube 612 installed between the two U - shaped brackets 611; a back transformation push rod 613 is rotatably installed between a U - shaped bracket 611 and the corresponding frame 1 below it, and a back air spring 614 is rotatably installed between the other U - shaped bracket 611 and the corresponding frame 1 below it. The back air spring 614 makes an extension / compression movement following the telescopic movement of the back transformation push rod 613. To ensure that the angle of back transformation is sufficient, one end of the back transformation push rod 613 in this embodiment is rotatably installed on the frame 1, and the other end is rotatably installed on the upper end of the U - shaped bracket 611 through a connecting piece. An armrest for ensuring the safety of the patient is installed on the U - shaped bracket 611. The armrest can adopt an armrest structure that is easily obtained in the prior art, and will not be elaborated here in detail.

[0073] See Figure 9, the leg transformation mechanism 62 includes a second bracket 621 fixedly installed on the support frame, a lower shaft frame 622 rotatably installed on the second bracket 621, and a leg transformation push rod 623 rotatably installed on the lower shaft frame 622. The fixed end of the leg transformation push rod 623 is rotatably connected to the lower shaft frame 622, and a leg transformation plate 624 is rotatably installed at the telescopic end of the leg transformation push rod 623. The leg transformation plate 624 is fixedly connected to both ends of the leg bracket 41. The foot-leg linkage assembly 63 is installed between the foot bracket 51 and the leg bracket 41. The foot-leg linkage assembly 63 includes an L-shaped connecting rod 631 fixedly installed at the upper end of the foot bracket 51 and an S-shaped connecting rod 632 rotatably connected to the L-shaped connecting rod 631. The end of the S-shaped connecting rod 632 away from the L-shaped connecting rod 631 is rotatably installed at the upper end of the leg bracket 41.

[0074] When converting the transfer wheelchair from the sitting posture to the lying posture, the back transformation push rod 613 and the leg transformation push rod 623 are activated, causing the back transformation push rod 613 and the leg transformation push rod 623 to perform an extension movement. Under the action of the back transformation push rod 613 and the back air spring 614, the back realizes the relative angle change between the back transfer mechanism 3 and the hip transfer mechanism 2 until the included angle between the two is 180 degrees. The leg transformation push rod 623 extends, driving the leg mechanism 4 to rotate relative to the hip transfer mechanism 2. At this time, under the action of the foot-leg linkage assembly 63, the foot mechanism 5 realizes the relative rotation between the foot mechanism 5 and the leg mechanism 4. When the included angle between the leg mechanism 4 and the hip transfer mechanism 2 is 180 degrees, the included angle between the foot mechanism 5 and the leg mechanism 4 is also 180 degrees. The transfer wheelchair is converted from the sitting posture to the lying posture.

[0075] When converting the transfer wheelchair from the lying posture to the sitting posture, the back transformation push rod 613 and the leg transformation push rod 623 are activated, causing the back transformation push rod 613 and the leg transformation push rod 623 to perform a contraction movement, realizing the conversion of the transfer wheelchair from the lying posture to the sitting posture.

[0076] Such as Figure 10As shown in the figure, the wheelchair in the first embodiment further includes a moving mechanism 7 installed at the lower end of the frame 1. The moving mechanism 7 includes a front universal wheel 71 installed at the front end of the frame 1, a "∫"-shaped connecting frame 72, a power conversion component 73, a rear universal wheel 74, and a power wheel 75. The "∫"-shaped connecting frame 72 is symmetrically and fixedly installed on both sides of the rear end of the frame 1, and the upper end of the "∫"-shaped connecting frame 72 extends towards the rear side of the frame 1. The power conversion component 73 is installed on the "∫"-shaped connecting frame 72. The rear universal wheel 74 and the power wheel 75 are both installed on the power conversion component 73, and the rear universal wheel 74 and the power wheel 75 do not contact the ground simultaneously. Specifically, the power conversion component 73 includes a conversion stepped crossbeam 731 rotatably installed on the frame 1, a fine-tuning connecting frame 732, a fine-tuning long hole 733, and a power conversion push rod 734. Among them, the fine-tuning connecting frame 732 is fixedly installed on the conversion stepped crossbeam 731. The fine-tuning long hole 733 is opened in the fine-tuning connecting frame 732 in the vertical direction. The fixed end of the power conversion push rod 734 is rotatably connected to the "∫"-shaped connecting frame 72, and the telescopic end of the power conversion push rod 734 is slidably arranged in the fine-tuning long hole 733 through a pin shaft. The power wheel 75 is installed at the front end of the conversion stepped crossbeam 731, and the rear universal wheel 74 is installed at the rear end of the conversion stepped crossbeam 731.

[0077] The conversion stepped crossbeam 731 in this embodiment includes a low stepped portion and a high stepped portion. During installation, the rear universal wheel 74 is installed on the high stepped portion, the power wheel 75 is installed on the low stepped portion, and at the same time, the rotational connection between the conversion stepped crossbeam 731 and the frame 1 is located on the high stepped portion. In this embodiment, the conversion stepped crossbeam 731, the "∫"-shaped connecting frame 72, the power conversion push rod 734, the fine-tuning connecting frame 732, and the connection relationships of various components are ingeniously adopted, so that when the power conversion push rod 734 is in a contracted state, the rear universal wheel 74 contacts the ground, and when the power conversion push rod 734 is in an extended state, the power wheel 75 contacts the ground, realizing the non-interference switching between the power wheel 75 and the rear universal wheel 74, and ensuring that the power wheel 75 and the rear universal wheel 74 do not touch the ground simultaneously.

[0078] It should be further noted that, in order to maintain the stability of the wheelchair in various postures, anti-tipping mechanisms are installed on both "∫"-shaped connecting frames 72. As a preferred implementation manner, the anti-tipping mechanism includes an anti-tipping frame fixedly installed behind the "∫"-shaped connecting frame 72 and anti-tipping wheels installed on the anti-tipping frame. The anti-tipping wheels are always in contact with the ground to provide stable support for the wheelchair.

[0079] As Figure 11 shown, based on the above-mentioned transfer method of the transfer wheelchair, it includes the following contents:

[0080] Step 1: The patient sits on the transfer wheelchair;

[0081] Step 2: Control the posture transformation device 6 to transform the transfer wheelchair into a lying posture;

[0082] Step 3: Determine the transfer direction according to actual needs; the transfer direction includes left-side transfer and right-side transfer;

[0083] Step 4: According to the transfer direction, simultaneously start the hip transfer mechanism 2, the back transfer mechanism 3, and the leg mechanism 4 in the same direction;

[0084] Step 5: The hip transfer mechanism 2, the back transfer mechanism 3, and the leg mechanism 4 drive the patient to transfer in the specified transfer direction until the patient is completely removed from the transfer wheelchair.

[0085] It should be understood that the specific embodiments described above are only used to explain the present invention and are not used to limit the present invention. Obvious changes or variations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A back transfer mechanism, characterized in that, include: Back support; a back driving mechanism mounted on the upper end of the back support; A back active roller and a back driven roller are installed on both sides of the back bracket; the back active roller is connected to the output end of the back driving mechanism through a first transmission mechanism; the back driven roller is connected to the back active roller through a back annular transfer belt; And at least one first anti-stuck device is arranged in the annular cavity of the back circular conveyor belt, the first anti-stuck device includes two first anti-stuck rollers arranged on both sides of the back bracket and a first anti-stuck annular belt wound on the two first anti-stuck rollers; a plurality of first transmission teeth are arranged on the inner side surface of the back circular conveyor belt along the Z-axis direction; a plurality of second transmission teeth that cooperate with the first transmission teeth are arranged on the outer side surface of the first anti-stuck annular belt, and the back bracket is arranged in the annular cavity of the first anti-stuck annular belt.

2. The back transfer mechanism according to claim 1, characterized in that The back driving mechanism comprises a first mounting frame mounted on the end of the back support, a back transfer motor mounted on the first mounting frame, a back driving gear coaxially arranged with the output shaft of the back transfer motor, and a back driven gear meshingly connected with the back driving gear; The first transmission mechanism includes a first transmission pulley installed at the upper end of the back support and a second transmission pulley coaxially arranged with the upper end of the back active roller; the first transmission pulley is coaxially arranged with the back driven gear, and the first transmission pulley and the second transmission pulley are connected by a first transmission belt.

3. The back transfer mechanism according to claim 1, characterized in that, Three of the first anti-stuck devices are provided, and the three first anti-stuck devices are arranged side by side along the Z-axis direction.

4. A back transfer mechanism according to claim 1, characterized in that At least two back toothed belt wheels are arranged on the back active roller and the back driven roller, and the back toothed belt wheels are in transmission cooperation with the first transmission teeth on the outer side of the back endless conveyor belt.

5. A back transfer mechanism according to claim 1, characterized in that, The back support comprises a frame body, a plurality of cross beams and a plurality of longitudinal beams fixedly arranged inside the frame body; the inner side surface of the first anti-stuck ring belt is a smooth surface and is gap-matched with the cross beams and the longitudinal beams.

6. A transfer wheelchair with high transfer stability, characterized in that, It includes a frame, a hip transfer mechanism installed on the frame, a leg mechanism rotatably mounted to the hip transfer mechanism, a foot mechanism rotatably connected to the leg mechanism, and a back transfer mechanism as described in any one of claims 1 to 5 rotatably connected to the hip transfer mechanism.

7. A transfer wheelchair with high transfer stability according to claim 6, characterized in that, The buttocks transfer mechanism comprises a buttocks frame mounted on the frame, a buttocks driving mechanism mounted on the buttocks frame, a first buttocks transfer component connected to the output end of the buttocks driving mechanism via a second transmission mechanism, and a second buttocks transfer component connected to the first buttocks transfer component via a third transmission mechanism; A second anti-stuck device is provided in both the first buttocks transfer assembly and the second buttocks transfer assembly.

8. The transfer wheelchair with high transfer stability according to claim 7, characterized in that, The leg mechanism comprises: a leg support rotatably connected to the hip frame; A leg driving mechanism, mounted on the lower end of the leg support; The leg driving roller and the leg driven roller; the leg driving roller is connected to the leg driving mechanism through the fifth transmission assembly, and the leg driving roller and the leg driven roller are connected through the leg transfer ring belt; The third anti-jamming device is arranged in the annular cavity of the leg transfer annular belt.

9. The transfer wheelchair with high transfer stability according to claim 6, wherein, It further includes an attitude transformation device for transforming the transfer wheelchair into a sitting attitude, a semi-reclining attitude, and a reclining attitude; the attitude transformation device includes a back transformation mechanism, a leg transformation mechanism, and a foot-leg linkage assembly.

10. The transfer method of a transfer wheelchair with high transfer stability according to claim 9, characterized in that, It includes the following: The patient sits on the transfer wheelchair. Control the attitude transformation device to transform the transfer wheelchair into a reclining attitude. Determine the transfer direction according to actual needs; the transfer direction includes left-side transfer and right-side transfer. According to the transfer direction, simultaneously start the hip transfer mechanism, the back transfer mechanism, and the leg mechanism in the same direction. The hip transfer mechanism, the back transfer mechanism, and the leg mechanism drive the patient to transfer in the specified transfer direction until the patient is completely removed from the transfer wheelchair.

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