Lifting mechanism for wheelchair, and wheelchair

Abstract

A lifting mechanism (10) for a wheelchair, the lifting mechanism comprising: a first base body (11) and a second base body (12), which are nested together, one of the first base body (11) and the second base body (12) being provided with a plurality of first sliding grooves (121) arranged at intervals, the other one being provided with a plurality of first sliding members (111) arranged at intervals, and the first sliding members (111) being slidable along the first sliding grooves (121); and a first transmission mechanism (13) and a second transmission mechanism (14), wherein the first transmission mechanism (13) can drive the second transmission mechanism (14), so that the second transmission mechanism (14) drives the second base body (12) to slide relative to the first base body (11). Further provided is a wheelchair (100).

Description

Lifting mechanism of wheelchair and wheelchair TECHNICAL FIELD

[0001] The present application relates to the technical field of wheelchairs, in particular to a lifting mechanism of a wheelchair and a wheelchair. BACKGROUND

[0002] A wheelchair is a chair with wheels that can help replace walking. It can be divided into electric folding wheelchairs and manual folding wheelchairs. Wheelchairs are important mobile tools for home rehabilitation, turnover transportation, medical treatment, and outdoor activities for special groups such as wounded, sick, and disabled people. Wheelchairs not only meet the needs of people with mobility difficulties, but also make it easier for family members to move and care for patients, allowing patients to exercise and participate in social activities with the help of wheelchairs.

[0003] Currently, existing wheelchairs on the market solve the problem of travel, but their functions are relatively simple, and few existing wheelchairs can achieve the leveling and lifting function of the seat.

[0004] To solve the above problems, some existing technologies have improved the structure of the wheelchair lifting function, such as:

[0005] Prior art 1: Chinese patent with publication number CN111388219A discloses a lifting structure suitable for a wheelchair. The lifting structure includes a wheelchair body, which includes a chair back frame, a chair seat frame, and a footrest assembly connected in sequence. The chair seat frame is connected to the chair back frame at one end and to the footrest assembly at the other end. The chair seat frame is connected to a sliding wheel assembly, and a lifting device and a sliding support device for supporting the wheelchair are provided between the chair seat frame and the sliding wheel assembly. When the lifting device pushes the wheelchair upwards, the chair seat frame rises, and at this time the first support rod slides along the sliding wheel assembly, slowly straightening up to support the chair seat frame, making the wheelchair more stable and increasing the safety during use.

[0006] Prior art 1 uses a scissor-type lifting mechanism to achieve the lifting of the seat. However, its structure is complex, the transmission efficiency is low, the space occupied is large, the flexibility is limited, the energy consumption and noise are large, and the center of the wheelchair moves when working, without self-locking function, poor stability.

[0007] Prior Art 2: US20150202102A1 discloses a wheelchair with an automatic seat lifting mechanism. The wheelchair includes a seat connected to a lifting mechanism. The lifting mechanism is connected to a pump driven by a motor, which is an electric pump or a hydraulic pump. In one embodiment, the motor is driven by a hand-held controller having a joystick thereon. The joystick can be used to change the height and position of the seat to facilitate the process of getting on and off the wheelchair. When the seat is in the raised position, the armrests of the wheelchair can be pivoted upward so that they do not interfere with the movement of the seat. The seat can be positioned close to a bed or another support surface so that the wheelchair user can slide onto or off the seat without being lifted.

[0008] Prior Art 2 uses a hydraulic drive lifting mechanism to realize the lifting of the seat. However, the hydraulic drive has the problem of hydraulic oil leakage, and the hydraulic oil is sensitive to temperature, which affects the transmission efficiency, and it is difficult to diagnose faults and has high maintenance cost.

[0009] SUMMARY

[0010] The embodiments of the present application provide a lifting mechanism of a wheelchair and a wheelchair, which can realize the lifting function of the seat, the lifting process of the seat is stable, and the seat has a self-locking function, which can ensure the stability and safety during the lifting process of the seat.

[0011] In a first aspect, the embodiments of the present application provide a lifting mechanism of a wheelchair, comprising:

[0012] A first seat body and a second seat body are sleeved with each other, one of the first seat body and the second seat body is provided with a plurality of first sliding grooves at intervals, and the other is provided with a plurality of first sliding members at intervals, each first sliding member is opposite to a first sliding groove, and the first sliding member can slide along the first sliding groove;

[0013] A first transmission mechanism is connected with the first seat body;

[0014] A second transmission mechanism is connected with the second seat body, and the second transmission mechanism is coupled with the first transmission mechanism;

[0015] The first transmission mechanism can drive the second transmission mechanism, so that the second transmission mechanism drives the second seat body to slide relative to the first seat body.

[0016] In a second aspect, the embodiments of the present application also provide a wheelchair, comprising:

[0017] A main body, a lifting mechanism and a seat, the bottom of the lifting mechanism is connected to the main body, the top of the lifting mechanism is connected to the seat, and the lifting mechanism can drive the seat to be raised or lowered;

[0018] The lifting mechanism comprises:

[0019] A first seat and a second seat are nested together. The first seat is connected to the main body, and the second seat is connected to the seat. One of the first seat and the second seat is provided with a plurality of first sliding grooves at intervals, and the other is provided with a plurality of first sliding members at intervals. Each first sliding member is opposite to a first sliding groove, and the first sliding member can slide along the first sliding groove.

[0020] The first transmission mechanism is connected to the first base body;

[0021] The second transmission mechanism is connected to the second base body, and the second transmission mechanism is coupled to the first transmission mechanism;

[0022] The first transmission mechanism can drive the second transmission mechanism, causing the second transmission mechanism to slide the second seat relative to the first seat, thereby driving the seat to rise or fall.

[0023] Thirdly, embodiments of this application also provide a wheelchair lifting mechanism, comprising:

[0024] The second seat body has multiple first sliding grooves spaced apart on its outer wall.

[0025] A first seat body is sleeved on the outside of the second seat body. A plurality of first sliding members are provided at intervals on the inner wall of the first seat body. Each first sliding member is opposite to a first sliding groove, and the first sliding member can slide along the first sliding groove.

[0026] The first transmission mechanism is connected to the first base body;

[0027] The second transmission mechanism is connected to the second base body, and the second transmission mechanism is coupled to the first transmission mechanism;

[0028] The first transmission mechanism can drive the second transmission mechanism, causing the second transmission mechanism to slide the second seat relative to the first seat. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the structure of the wheelchair provided in an embodiment of this application.

[0031] Figure 2 is a structural schematic diagram of the lifting mechanism provided in the embodiment of this application.

[0032] Figure 3 is a partially enlarged schematic diagram of the first slide groove and the first sliding member of the lifting mechanism provided in the embodiment of this application.

[0033] Figure 4 is a longitudinal sectional view of the lifting mechanism provided in the embodiment of this application.

[0034] Figure 5 is a cross-sectional view of the lifting mechanism provided in the embodiment of this application.

[0035] Figure 6 is a partially enlarged schematic diagram of the location of the second ball head of the lifting mechanism provided in the embodiment of this application.

[0036] Figure 7 is a schematic diagram of the structure of the lifting mechanism provided in the embodiment of this application, in which a photoelectric sensor is installed. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0038] This application provides a wheelchair with a seat that can be raised and lowered to adjust the seat height and meet the needs of different users or the same user in different situations.

[0039] Referring to Figure 1, which is a structural schematic diagram of a wheelchair 100 provided in an embodiment of this application, the wheelchair 100 includes a lifting mechanism 10, a main body 20, and a seat 30.

[0040] The main body 20 serves as the support structure for the bottom of the wheelchair 100, the seat 30 is for the user to sit on, and the lifting mechanism 10 connects the main body 20 and the seat 30. The bottom of the lifting mechanism 10 is connected to the main body 20, and the top of the lifting mechanism 10 is connected to the seat 30. The lifting mechanism 10 can drive the seat 30 to rise or fall to adjust the height of the seat 30.

[0041] Referring to Figure 2, which is a structural schematic diagram of the lifting mechanism 10 provided in an embodiment of this application.

[0042] The lifting mechanism 10 includes a first seat 11 and a second seat 12 that are nested together. In practical applications, the first seat 11 can be positioned outside the second seat 12, or the second seat 12 can be positioned outside the first seat 11. In one example, as shown in Figure 2, the first seat 11 is nested outside the second seat 12. In one application example, the first seat 11 is located below the lifting mechanism 10, with its bottom connected to the wheelchair body 20; the second seat 12 is located above the lifting mechanism 10, with its top connected to the wheelchair seat 30.

[0043] In this configuration, one of the first seat 11 and the second seat 12 is provided with a plurality of first sliding grooves at intervals, and the other is provided with a plurality of first sliding members at intervals. Each first sliding member is opposite to a first sliding groove, and the first sliding member can slide along the first sliding groove, thereby enabling relative sliding between the first seat 11 and the second seat 12. In one example, as shown in Figure 2, the first seat 11 is sleeved on the outside of the second seat 12. In this case, the outer wall of the second seat 12 is provided with a plurality of first sliding grooves 121 at intervals, and the inner wall of the first seat 11 is provided with a plurality of first sliding members 111 at intervals.

[0044] In another example, when the first seat 11 is sleeved on the outside of the second seat 12, multiple first sliding members can be provided at intervals on the outer wall of the second seat 12, and multiple first sliding grooves can be provided at intervals on the inner wall of the first seat 11.

[0045] In another example, when the second seat 12 is sleeved on the outside of the first seat 11, a plurality of first sliding grooves can be provided at intervals on the outer wall of the first seat 11, and a plurality of first sliding members can be provided at intervals on the inner wall of the second seat 12; or, a plurality of first sliding members can be provided at intervals on the outer wall of the first seat 11, and a plurality of first sliding grooves can be provided at intervals on the inner wall of the second seat 12.

[0046] The following describes the technical solution of this application embodiment using the structure of the lifting mechanism 10 shown in Figure 2 as an example. The first seat 11 is sleeved on the outside of the second seat 12, a plurality of first sliding grooves 121 are spaced apart on the outer wall of the second seat 12, and a plurality of first sliding members 111 are spaced apart on the inner wall of the first seat 11.

[0047] In some embodiments, a plurality of first sliding grooves 121 are evenly distributed along the outer wall of the second seat 12, and a plurality of first sliding members 111 are evenly distributed along the inner wall of the first seat 11. For example, the plurality of first sliding grooves 121 may be evenly distributed along the longitudinal direction of the lifting mechanism 10 on the outer wall of the second seat 12, and the plurality of first sliding members 111 may be evenly distributed along the longitudinal direction of the lifting mechanism 10 on the inner wall of the first seat 11.

[0048] In another example, a first seat 11 is fitted onto the outside of a second seat 12, with multiple first sliding members spaced apart on the outer wall of the second seat 12 and multiple first sliding grooves spaced apart on the inner wall of the first seat 11. In this case, the multiple first sliding members can be evenly distributed along the outer wall of the second seat 12, and the multiple first sliding grooves can be evenly distributed along the inner wall of the first seat 11. For example, the multiple first sliding members can be evenly distributed along the longitudinal direction of the lifting mechanism 10 on the outer wall of the second seat 12, and the multiple first sliding grooves can be evenly distributed along the longitudinal direction of the lifting mechanism 10 on the inner wall of the first seat 11.

[0049] In some embodiments, as shown in FIG2, the outer wall of the second seat 12 includes a first flat portion 122a, a first curved portion 122b, a second flat portion 122c, and a second curved portion 122d connected in sequence. The inner wall of the first seat 11 includes a third flat portion 112a, a third curved portion 112b, a fourth flat portion 112c, and a fourth curved portion 112d connected in sequence.

[0050] The plurality of first sliding grooves 121 are evenly distributed on the first planar portion 122a and the second planar portion 122c. The plurality of first sliding members 111 are evenly distributed on the third planar portion 112a and the fourth planar portion 112c. For example, the plurality of first sliding grooves 121 may be evenly distributed on the first planar portion 122a and the second planar portion 122c along the longitudinal direction of the lifting mechanism 10, and the plurality of first sliding members 111 may be evenly distributed on the third planar portion 112a and the fourth planar portion 112c along the longitudinal direction of the lifting mechanism 10.

[0051] In another example, the first seat 11 is sleeved on the outside of the second seat 12, a plurality of first sliding members are spaced apart on the outer wall of the second seat 12, and a plurality of first sliding grooves are spaced apart on the inner wall of the first seat 11. In this case, the plurality of first sliding members can be evenly distributed on the first plane portion 122a and the second plane portion 122c of the second seat 12, and the plurality of first sliding grooves can be evenly distributed on the third plane portion 112a and the fourth plane portion 112c of the first seat 11.

[0052] In some embodiments, the first seat 11 and the second seat 12, which are provided with a plurality of first sliding members, each includes a plurality of protrusions that protrude from the surface and are spaced apart from each other.

[0053] For example, referring to FIG3, FIG3 is a partially enlarged schematic diagram of the first sliding groove and the first sliding member of the lifting mechanism 10 provided in the embodiment of this application. The description takes as an example that multiple first sliding grooves 121 are disposed on the second base 12 and multiple first sliding members 111 are disposed on the first base 11. The first base 11 includes multiple protrusions 113 protruding from its surface, and the multiple protrusions 113 are spaced apart from each other. In some embodiments, the end of the protrusion 113 is provided with a groove 113a, so that the end of the protrusion 113 forms a hollow shape, thereby allowing the end of the protrusion 113 to deform when compressed. In practical applications, the groove 113a can be arranged along the longitudinal direction of the lifting mechanism 10.

[0054] As can be understood, as shown in Figure 3, since the first seat 11 is sleeved on the outside of the second seat 12 and the first sliding member 111 is disposed on the first seat 11, the protrusion 113 protrudes from the inner wall of the first seat 11.

[0055] In some embodiments, when the first seat 11 is sleeved on the outside of the second seat 12 and the first slider is disposed on the second seat 12, the protrusion is configured to protrude from the outer wall of the second seat 12.

[0056] In some embodiments, when the second seat 12 is sleeved on the outside of the first seat 11, if the first slider 111 is provided on the first seat 11, then the protrusion 113 is configured to protrude from the outer wall of the first seat 11; if the first slider is provided on the second seat 12, then the protrusion is configured to protrude from the inner wall of the second seat 12.

[0057] In some embodiments, taking the structure shown in FIG3 as an example, the first slider 111 includes one or more plastic parts and one or more spring pieces, the one or more plastic parts are disposed around the periphery of the protrusion 113, and the one or more spring pieces are disposed between the plastic parts and the protrusion 113.

[0058] For example, the first sliding member 111 includes multiple plastic parts and multiple spring pieces, such as multiple plastic parts 1111, 1112, and 1113, and multiple spring pieces 1114, 1115, and 1116. It is understood that, depending on actual needs, the shapes and sizes of the multiple plastic parts 1111, 1112, and 1113 can be the same or different from each other; the shapes and sizes of the multiple spring pieces 1114, 1115, and 1116 can also be the same or different from each other. Specifically, the plastic parts 1111, 1112, and 1113 surround the periphery of the protrusion 113, the spring piece 1114 is disposed between the plastic part 1111 and the protrusion 113, the spring piece 1115 is disposed between the plastic part 1112 and the protrusion 113, and the spring piece 1116 is disposed between the plastic part 1113 and the protrusion 113.

[0059] Understandably, the spring can provide elasticity between the plastic part and the protrusion 113, causing the plastic part to abut against the first groove, thereby allowing the plastic part to slide along the first groove. Furthermore, in some embodiments, the end of the protrusion 113 is formed with a hollow shape, and the end of the protrusion 113 can deform when compressed. Therefore, the end of the protrusion 113 can also provide elasticity, ensuring good contact between the plastic part and the first groove, and improving the stability of the plastic part when sliding relative to the first groove.

[0060] Referring to Figure 4, which is a longitudinal sectional view of the lifting mechanism 10 provided in an embodiment of this application, the lifting mechanism 10 further includes a first transmission mechanism 13 and a second transmission mechanism 14.

[0061] The first transmission mechanism 13 is connected to the first seat 11. The second transmission mechanism 14 is connected to the second seat 12. The second transmission mechanism 14 is coupled to the first transmission mechanism 13, and the first transmission mechanism 13 can drive the second transmission mechanism 14, causing the second transmission mechanism 14 to slide the second seat 12 relative to the first seat 11. It is understood that since the first seat 11 is connected to the wheelchair body 20 and the second seat 12 is connected to the wheelchair seat 30, when the second seat 12 slides relative to the first seat 11, it can drive the seat 30 to rise or fall, thus enabling height adjustment of the seat 30.

[0062] Referring also to Figure 5, which is a cross-sectional view of the lifting mechanism 10 provided in the embodiment of this application.

[0063] In some embodiments, the first transmission mechanism 13 includes a drive member 131, a worm 132, and a worm gear assembly 133. One end of the worm 132 is connected to the drive member 131, and the worm gear assembly 133 meshes with the worm 132. The worm gear assembly 133 has threads on its inner side. The drive member 131 is configured to drive the worm 132 to rotate, causing the worm 132 to drive the worm gear assembly 133 to rotate.

[0064] In some embodiments, the drive element 131 includes a motor having an output shaft 1311. The output shaft 1311 of the motor is fixedly connected to one end of the worm gear 132. Therefore, the motor can drive the worm gear 132 to rotate.

[0065] In some embodiments, the second transmission mechanism 14 includes a lead screw. The lead screw passes through and engages with the threads of the worm gear assembly 133. When the worm gear assembly 133 rotates, it drives the lead screw to move in a straight line, so that the lead screw causes the second seat 12 to slide relative to the first seat 11.

[0066] In some embodiments, as shown in FIG5, the worm gear assembly 133 includes a worm gear 1331 and a nut 1332. The worm gear 1331 meshes with the worm 132, so when the driving member 131 drives the worm 132 to rotate, the worm 132 can drive the worm gear 1331 to rotate. The nut 1332 is disposed inside the worm gear 1331 and is fixedly connected to the worm gear 1331; when the worm gear 1331 rotates, it can drive the nut 1332 to rotate synchronously. The lead screw 14 passes through the nut 1332 and meshes with it, so when the nut 1332 rotates, it can drive the lead screw 14 to move linearly. Therefore, under the drive of the driving member 131, power is transmitted sequentially through the worm 132, worm gear 1331, and nut 1332, enabling the lead screw 14 to move linearly, causing the lead screw 14 to drive the second seat 12 to slide relative to the first seat 11.

[0067] In some embodiments, the worm gear assembly 133 may include a worm gear, but not the nut as described in the above embodiments. In this case, the worm gear meshes with the worm 132. The worm gear has threads on its inner side, which can be formed by machining methods such as turning, milling, or tapping. The lead screw 14 passes through the worm gear and meshes with the threads on its inner side. Therefore, when the drive member 131 drives the worm 132 to rotate, the worm 132 can drive the worm gear to rotate, and the worm gear transmits power to the lead screw 14 through its inner threads, causing the lead screw 14 to move linearly. Therefore, under the drive of the drive member 131, power is transmitted sequentially through the worm 132 and the worm gear, enabling the lead screw 14 to move linearly, causing the lead screw 14 to drive the second seat 12 to slide relative to the first seat 11.

[0068] In practical applications, when the drive unit 131 drives the worm gear 132 to rotate, the worm wheel assembly 133 also begins to rotate because it meshes with the worm gear 132. The nut 1332 of the worm wheel assembly 133 meshes with the lead screw 14, or the worm wheel of the worm wheel assembly 133 directly meshes with the lead screw 14 through the thread on the inner side of the worm wheel. Therefore, when the worm wheel assembly 133 rotates, it drives the lead screw 14 to move linearly along the axial direction. Specifically, when the worm gear 132 rotates clockwise or counterclockwise, that is, when the output shaft of the drive unit 131 (e.g., the motor) rotates forward or reverse, the worm wheel assembly 133 will rotate clockwise or counterclockwise accordingly, thereby driving the lead screw 14 to rise or fall, and further driving the wheelchair seat 30 to rise or fall.

[0069] Understandably, due to the structural characteristics of the lead screw and nut, the lead screw and nut transmission has a self-locking characteristic. That is, the meshing between the nut 1332 and the lead screw 14 has a self-locking characteristic, or the meshing between the worm gear (through the thread on the inner side of the worm gear) and the lead screw 14 has a self-locking characteristic. Therefore, when the power source (i.e., the drive component 131) stops working, the load (i.e., the seat 30, or the seat 30 and the user sitting on it) will not move downwards due to its own weight. Therefore, the structural stability and safety of the lifting mechanism 10 can be guaranteed, thereby ensuring the stability and safety of the seat 30 during the lifting process. In addition, the smoothness of the worm gear and worm wheel and the lead screw and nut (or the thread on the inner side of the worm wheel and the lead screw) transmission is good, which can realize the smooth lifting of heavy objects. Therefore, the smoothness of the movement process can be guaranteed during the adjustment of the height of the seat 30.

[0070] In some embodiments, continuing to refer to FIG4, the second seat 12 includes opposing top wall 123a and bottom wall 123b. Top wall 123a is located at the top end of the second seat 12, and bottom wall 123b is located at the bottom end of the second seat 12. One end (e.g., the top end) of the second transmission mechanism 14 is connected to the top wall 123a of the second seat 12 via a first ball joint 124a. The other end (e.g., the bottom end) of the second transmission mechanism 14 is connected to the bottom wall 123b of the second seat 12 via a second ball joint 124b.

[0071] In some embodiments, referring to FIG6, FIG6 is a partially enlarged schematic diagram of the portion of the lifting mechanism 10 provided in this application where the second ball head 124b is located. The lifting mechanism 10 further includes a fixing member 125 and a connecting member 126. The fixing member 125 is disposed between the second ball head 124b and the bottom wall 123b of the second base 12. The connecting member 126 surrounds the periphery of the second ball head 124b and connects to the bottom wall 123b of the second base 12. A through hole may be provided in the middle of the connecting member 126.

[0072] Understandably, in practical applications, there are assembly gaps between the fixing part 125 and the second seat 12, and between the connecting part 126 and the second seat 12. Therefore, the second ball head 124b can eliminate the translation or deflection error caused by the relative sliding of the second seat 12 and the first seat 11, thereby improving the overall structural stability and smoothness of the lifting mechanism 10.

[0073] In some embodiments, continuing to refer to FIG4, the second base 12 includes an outer cylinder 12a and an inner cylinder 12b. Both the outer cylinder 12a and the inner cylinder 12b can be closed or semi-closed shells, or shells with openings or notches. The outer cylinder 12a forms the outer shell of the second base 12, and is sleeved with the first base 11. The top wall 123a is located at the top of the outer cylinder 12a, and the bottom wall 123b is located at the bottom of the outer cylinder 12a. The inner cylinder 12b is disposed inside the outer cylinder 12a. The second transmission mechanism 14 passes through the inner cylinder 12b, and the top and bottom ends of the inner cylinder 12b may be provided with through holes. The top of the inner cylinder 12b is engaged between one end (e.g., the top end) of the second transmission mechanism 12 and the first ball head 124a. The bottom of the inner cylinder 12b is engaged between the other end (e.g., the bottom end) of the second transmission mechanism 14 and the second ball head 124b.

[0074] Understandably, the outer cylinder 12a and the inner cylinder 12b are fixedly connected by the second transmission mechanism 14, the first ball head 124a, the second ball head 124b, the fixing member 125, and the connecting member 126. Therefore, when the second transmission mechanism 14 moves in a straight line, for example, when it rises or falls, it can drive the outer cylinder 12a and the inner cylinder 12b to rise or fall together, that is, drive the second seat body 12 to slide upward or downward relative to the first seat body 11, so as to drive the seat 30 to rise or fall.

[0075] In some embodiments, continuing to refer to FIG4, the lifting mechanism 10 further includes a mounting base 151. The mounting base 151 is disposed inside the outer cylinder 12a. The mounting base 151 is fixedly connected to the first seat body 11 via a connecting structure 152. A first transmission mechanism 13 is disposed on the mounting base 151. The inner cylinder 12b has an opening 12b1 on one side and a sidewall 12b2 on the other side. The mounting base 151 abuts against the sidewall 12b2 of the inner cylinder 12b and is capable of sliding relative to the sidewall 12b2.

[0076] Understandably, during the process of the first transmission mechanism 13 driving the second transmission mechanism 14, the mounting base 151 and the first transmission mechanism 13 mounted on the mounting base 151 remain stationary. The second transmission mechanism 14 moves linearly relative to the first transmission mechanism 13, and the second transmission mechanism 14 drives the second seat 12 to slide relative to the first seat 11. The mounting base 151 slides relative to the side wall 12b2 of the inner cylinder 12b. Therefore, the relative sliding between the second seat 12 and the first seat 11 can be made smoother, ensuring the smoothness of the movement process.

[0077] In some embodiments, continuing to refer to FIG4, a second sliding member 1511 is provided on the mounting base 151. For example, the second sliding member 1511 can be a sliding plate. A second sliding groove 12b3 is provided on the side wall 12b2 of the inner cylinder 12b. The second sliding member 1511 is opposite to the second sliding groove 12b3. When the second seat 12 slides relative to the first seat 11, the second sliding member 1511 slides along the second sliding groove 12b3. It can be understood that by providing the second sliding member 1511 and the second sliding groove 12b3, relative sliding between the mounting base 151 and the side wall 12b2 of the second seat 12 can be achieved.

[0078] In some embodiments, the lifting mechanism 10 further includes a photoelectric sensor. The photoelectric sensor includes a separately disposed signal transmitter and signal receiver.

[0079] In one example, referring to Figure 7, which is a schematic diagram of the structure of a lifting mechanism with a photoelectric sensor provided in an embodiment of this application, the photoelectric sensor includes a separately disposed signal transmitter 161 and a signal receiver 162. There can be one or more signal transmitters 161, and one or more signal receivers 162. It should be noted that the signal transmitter can also be called a photoelectric slot, and the signal receiver can also be called a photoelectric switch. Specifically, the signal transmitter 161 is disposed in the inner cylinder 12b of the second base 12, and the signal receiver 162 is disposed in the mounting base 151.

[0080] In another example, the photoelectric sensor includes a separately disposed signal transmitter and a signal receiver. The signal transmitter (photoelectric slot) can be disposed in the mounting base 151, while the signal receiver (photoelectric switch) can be disposed in the inner cylinder 12b of the second base 12.

[0081] In the above examples, when the signal transmitter and the signal receiver are facing each other, the signal receiver can receive the signal emitted by the signal transmitter. Therefore, the relative position of the mounting base 151 and the inner cylinder 12b can be determined based on the received signal, that is, the relative position of the first base 11 and the second base 12.

[0082] Understandably, when the mounting base 151 is in its initial position, the signal receiver may not be able to directly detect the signal (e.g., when the initial position of the signal transmitter is below the mounting base 151), or the signal receiver may be able to detect a stable signal (e.g., the signal transmitter is always opposite the signal receiver, but the signal receiver can determine this by the detected signal strength). As the relative position of the mounting base 151 and the inner cylinder 12b changes (i.e., when the second seat 12 slides relative to the first seat 11), the signal receiver gradually approaches or moves away from the signal transmitter, or the signal strength received by the signal receiver continuously changes. When the mounting base 151 and the inner cylinder 12b are in a specific relative position (i.e., when the second seat 12 is in a specific relative position relative to the first seat 11), the signal receiver is able to receive the signal emitted by the signal transmitter, or the signal receiver is able to receive a signal of a specific strength.

[0083] When the signal receiver receives a signal transmitted by the signal transmitter, or receives a signal of a specific strength, it converts the received signal into an electrical signal and sends it to the control system. This electrical signal can be an analog signal (such as a voltage or current change signal) or a digital signal (such as a switch state change signal). After receiving this electrical signal, the control system analyzes and processes it. By comparing the currently received electrical signal with a preset signal, the control system can determine whether the second seat 12 has moved to the preset position. If the control system determines that the second seat 12 has moved to the preset position, it can take corresponding actions according to application requirements, such as controlling the second seat 12 to stop moving, triggering other equipment actions, or sending a feedback signal to the operator. If the control system determines that the second seat 12 has not yet reached the preset position, it can control the second seat 12 to continue moving until it receives a signal corresponding to the preset position.

[0084] Understandably, using the photoelectric sensor setups in the examples above has the following advantages:

[0085] First: High-precision positioning

[0086] Accuracy: The photoelectric sensor can accurately detect changes in signals (such as light). By comparing the preset signals, it can accurately determine whether the second seat 12 has moved to the preset position, thereby achieving high-precision positioning.

[0087] Repeatability: Due to the stability and reliability of photoelectric sensors, the positioning process is highly repeatable, and the positioning results remain consistent each time.

[0088] Second: Real-time feedback and monitoring

[0089] Real-time performance: Photoelectric sensors can detect changes in signals (such as light) in real time and immediately transmit the signals to the control system, enabling real-time position feedback.

[0090] Monitoring capability: By continuously monitoring the signals of the photoelectric sensor, the position of the second seat 12 can be monitored in real time, and any deviation can be detected and corrected in a timely manner.

[0091] Third: Improve production efficiency and safety

[0092] Automation: This solution can be integrated with an automated control system to achieve automatic positioning and movement control of the second seat 12, thereby improving production efficiency.

[0093] Safety: Precise positioning control can prevent equipment collisions, damage, or personal injury caused by positional deviations, thereby improving workplace safety.

[0094] Fourth: Simplify installation and maintenance

[0095] Easy to install: The design of the signal receiver and signal transmitter (or photoelectric slot) of the photoelectric sensor is relatively simple, making it easy to install and debug.

[0096] Easy to maintain: Since photoelectric sensors usually have high reliability and stability, they have low maintenance requirements and are easy to diagnose and repair once a fault occurs.

[0097] Fifth: Flexibility and scalability

[0098] Flexibility: This solution can be adjusted and optimized according to different application requirements, such as changing the spacing of the photoelectric slots or adjusting the sensitivity of the photoelectric sensor.

[0099] Scalability: This solution can be integrated with other sensors, actuators and control systems to achieve more complex automated control and positioning functions.

[0100] In some embodiments, the lifting mechanism 10 may include a light-shielding member disposed on the mounting base 151. During the sliding process of the second base 12 relative to the first base 11, the position of the mounting base 151 relative to the inner cylinder 12b changes, and the position of the light-shielding member relative to the inner cylinder 12b also changes synchronously. The path of the relative position change can be understood as the movement path of the mounting base 151.

[0101] The photoelectric sensor includes a separately disposed signal transmitter and a signal receiver. There can be one or more photoelectric sensors. The signal receiver is configured to receive the signal emitted by the opposing signal transmitter. Both the signal transmitter and the signal receiver are disposed within the inner cylinder 12b of the second housing 12. The signal transmitter and the signal receiver are opposite each other and located on opposite sides of the movement path of the light-shielding member. When the light-shielding member moves between the signal transmitter and the signal receiver, it blocks the signal emitted by the signal transmitter, at which point the signal receiver cannot receive the signal.

[0102] Understandably, when the mounting base 151 is in its initial position, the light-shielding component may not block any signal transmitters, or it may block a specific signal transmitter. During the change in the relative position of the mounting base 151 and the inner cylinder 12b (i.e., during the sliding of the second base 12 relative to the first base 11), the light-shielding component will sequentially block different signal transmitters (if there are multiple photoelectric sensors), or block a signal transmitter at a specific position (if there is only one photoelectric sensor). When the light-shielding component blocks a signal transmitter, the signal received by the signal receiver will change. The signal receiver converts this change into a corresponding electrical signal and sends the electrical signal to the control system. After receiving this electrical signal, the control system analyzes and processes it. By comparing the currently received electrical signal with a preset signal, the control system can determine whether the second base 12 has moved to the preset position. If the control system determines that the second base 12 has moved to the preset position, it can take corresponding actions according to application requirements, such as controlling the second base 12 to stop moving, triggering other equipment actions, or sending a feedback signal to the operator. If the control system determines that the second seat 12 has not yet reached the preset position, it can control the second seat 12 to continue moving until it receives a signal corresponding to the preset position.

[0103] Understandably, the solution combining a light-shielding element with a photoelectric sensor has the following advantages:

[0104] First: Precise positioning

[0105] High precision: High-precision positioning can be achieved by rationally designing the spacing of the signal transmitters (or photoelectric slots) and the width of the light-shielding components. The denser the photoelectric slots, the higher the positioning accuracy, meeting the application scenarios with strict position control requirements.

[0106] Real-time feedback: The photoelectric sensor can detect the status of the light-blocking component in real time. Once the light-blocking component blocks a specific photoelectric slot, it immediately sends a signal to the control system to ensure that the lifting height of the second seat 12 can be accurately stopped at the preset position.

[0107] Second: High reliability

[0108] Stability: The light-shielding component and photoelectric slot are designed inside the first body 11. Taking into account the influence of environmental factors (such as vibration, dust, etc.), it is ensured that misjudgment or failure is not likely to occur during long-term use.

[0109] Strong anti-interference capability: Photoelectric sensors typically have high anti-interference capability, enabling them to work stably in complex working environments and improving the overall reliability of the system.

[0110] Third: Simple and easy to implement

[0111] Simple structure: Compared with other complex positioning mechanisms, the combination structure of the light-shielding component and the photoelectric slot is relatively simple, and easy to manufacture, install and maintain.

[0112] Easy to operate: The control system can determine the position of the second seat 12 based on the signal from the photoelectric sensor, without the need for additional complex calculations or calibration processes, making it easy to operate.

[0113] In the description of this application, it should be understood that terms such as “first” and “second” are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0114] The lifting mechanism and wheelchair provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application; at the same time, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A lifting mechanism of a wheelchair, comprising: a first seat body and a second seat body sleeved with each other, one of the first seat body and the second seat body is provided with a plurality of first sliding grooves at intervals, and the other is provided with a plurality of first sliding members at intervals, each of the first sliding members is opposite to one of the first sliding grooves, and the first sliding member is capable of sliding along the first sliding groove; a first transmission mechanism connected with the first seat body; a second transmission mechanism connected with the second seat body, the second transmission mechanism is coupled with the first transmission mechanism; the first transmission mechanism is capable of driving the second transmission mechanism to drive the second seat body to slide relative to the first seat body. 2.The lifting mechanism according to claim 1, wherein: the first seat body is sleeved outside the second seat body; the plurality of first sliding grooves are provided at intervals on an outer wall of the second seat body, and the plurality of first sliding members are provided at intervals on an inner wall of the first seat body; or the plurality of first sliding members are provided at intervals on an outer wall of the second seat body, and the plurality of first grooves are provided at intervals on an inner wall of the first seat body. 3.The lifting mechanism according to claim 2, wherein: the plurality of first sliding grooves are uniformly distributed along the outer wall of the second seat body, and the plurality of first sliding members are uniformly distributed along the inner wall of the first seat body; or the plurality of first sliding members are uniformly distributed along the outer wall of the second seat body, and the plurality of first sliding grooves are uniformly distributed along the inner wall of the first seat body. 4.The lifting mechanism according to claim 2, wherein: the outer wall of the second seat body comprises a first planar portion, a first curved portion, a second planar portion and a second curved portion connected in sequence, and the inner wall of the first seat body comprises a third planar portion, a third curved portion, a fourth planar portion and a fourth curved portion connected in sequence; the plurality of first sliding grooves are uniformly distributed on the first planar portion and the second planar portion, and the plurality of first sliding members are uniformly distributed on the third planar portion and the fourth planar portion; or the plurality of first sliding members are uniformly distributed on the first planar portion and the second planar portion, and the plurality plurality of first sliding grooves are uniformly distributed on the third planar portion and the fourth planar portion. 5.The lifting mechanism according to claim 1, wherein: the other of the first seat body and the second seat body comprises a plurality of protruding portions protruding from a surface, the plurality of protruding portions are spaced apart from each other; the first sliding member comprises one or more plastic members and one or more elastic pieces, the one or more plastic members surround peripheries of the protruding portions, and the one or more elastic pieces are arranged between the plastic members and the protruding portions. 6.The lifting mechanism according to claim 1, wherein: the first transmission mechanism comprises a driving member, a worm and a worm gear assembly, one end of the worm is connected with the driving member, the worm gear assembly is engaged with the worm, and an inner side of the worm gear assembly is provided with threads, and the driving member is configured to drive the worm to rotate, so that the worm drives the worm gear assembly to rotate. The second transmission mechanism comprises a screw rod, the screw rod is arranged in the worm gear assembly and is engaged with the screw thread, the worm gear assembly drives the screw rod to move linearly when the worm gear assembly rotates, and the screw rod drives the second seat body to slide relative to the first seat body.

7. The lifting mechanism according to claim 6, wherein: The worm gear assembly comprises a worm gear and a nut, the worm gear is engaged with the worm, the nut is arranged inside the worm gear and is fixedly connected with the worm gear, and the screw rod is arranged in the nut and is engaged with the nut.

8. The lifting mechanism according to claim 6, wherein: The worm gear assembly comprises a worm gear, the worm gear is engaged with the worm, and the inside of the worm gear is provided with a screw thread, the screw rod is arranged in the worm gear and is engaged with the screw thread inside the worm gear.

9. The lifting mechanism according to claim 6, wherein: The driving member comprises a motor, and an output shaft of the motor is fixedly connected with one end of the worm.

10. The lifting mechanism according to claim 1, wherein: The second seat body comprises opposite top and bottom walls; One end of the second transmission mechanism is connected to the top wall through a first ball head, and the other end is connected to the bottom wall through a second ball head.

11. The lifting mechanism of claim 10, wherein, Further comprising: A fixing member is arranged between the second ball head and the bottom wall; A connecting member is arranged around the periphery of the second ball head and is connected with the bottom wall.

12. The lifting mechanism according to claim 10, wherein: The second seat body comprises an outer cylinder and an inner cylinder, the outer cylinder is sleeved with the first seat body, the top wall is located at the top of the outer cylinder, and the bottom wall is located at the bottom of the outer cylinder; The inner cylinder is arranged inside the outer cylinder, the second transmission mechanism is arranged in the inner cylinder, the top of the inner cylinder is clamped between one end of the second transmission mechanism and the first ball head, and the bottom of the inner cylinder is clamped between the other end of the second transmission mechanism and the second ball head.

13. The lifting mechanism according to claim 12, wherein: One side of the inner cylinder is provided with an opening, and the other side is provided with a side wall; The lifting mechanism further comprises a mounting seat, the mounting seat is arranged inside the outer cylinder, the mounting seat is fixedly connected with the first seat body through a connecting structure, the mounting seat abuts against the side wall and can slide relative to the side wall, and the first transmission mechanism is arranged in the mounting seat.

14. The lifting mechanism according to claim 13, wherein: A second sliding member is arranged on the mounting seat, the side wall of the inner cylinder is provided with a second sliding groove, the second sliding member is opposite to the second sliding groove; and When the second seat body slides relative to the first seat body, the second sliding member slides along the second sliding groove.

15. The lifting mechanism of claim 14, wherein, Further comprising: A photoelectric sensor, the photoelectric sensor comprises a signal transmitter and a signal receiver which are separately arranged; The signal transmitter is arranged on the mounting seat, and the signal receiver is arranged on the inner cylinder; or, the signal transmitter is arranged on the inner cylinder, and the signal receiver is arranged on the mounting seat; When the signal transmitter is opposite to the signal receiver, the signal receiver receives the signal emitted by the signal transmitter.

16. The lifting mechanism of claim 14, wherein, Further comprising: A light shielding member is arranged in the mounting seat; The photoelectric sensor comprises a signal emitter and a signal receiver arranged separately, both of which are arranged in the inner cylinder, and the signal emitter and the signal receiver are opposite and located on both sides of the moving path of the light shielding member, and the signal receiver is configured to receive the signal emitted by the signal emitter; When the light shielding member moves between the signal emitter and the signal receiver, the light shielding member blocks the signal emitted by the signal emitter.

17. A wheelchair comprising: a main body, a lifting mechanism, and a seat, a bottom of the lifting mechanism is connected to the main body, a top of the lifting mechanism is connected to the seat, and the lifting mechanism can drive the seat to be raised or lowered; the lifting mechanism comprises: a first seat body and a second seat body that are sleeved with each other, the first seat body is connected to the main body, and the second seat body is connected to the seat, one of the first seat body and the second seat body is provided with a plurality of first sliding grooves at intervals, and the other is provided with a plurality of first sliding members at intervals, each first sliding member is opposite to one first sliding groove, and the first sliding member can slide along the first sliding groove; a first transmission mechanism connected to the first seat body; a second transmission mechanism connected to the second seat body, and the second transmission mechanism is coupled with the first transmission mechanism; the first transmission mechanism can drive the second transmission mechanism, so that the second transmission mechanism drives the second seat body to slide relative to the first seat body, to drive the seat to be raised or lowered.

18. The wheelchair according to claim 17, wherein: the first seat body is sleeved outside the second seat body; the plurality of first sliding grooves are arranged at intervals on the outer wall of the second seat body, and the plurality of first sliding members are arranged at intervals on the inner wall of the first seat body; or the plurality of first sliding members are arranged at intervals on the outer wall of the second seat body, and the plurality of first grooves are arranged at intervals on the inner wall of the first seat body.

19. The wheelchair according to claim 18, wherein: the plurality of first sliding grooves are uniformly distributed along the outer wall of the second seat body, and the plurality of first sliding members are uniformly distributed along the inner wall of the first seat body; or the plurality of first sliding members are uniformly distributed along the outer wall of the second seat body, and the plurality of first sliding grooves are uniformly distributed along the inner wall of the first seat body.

20. The wheelchair according to claim 18, wherein: the outer wall of the second seat body comprises a first planar part, a first curved part, a second planar part, and a second curved part connected in sequence, and the inner wall of the first seat body comprises a third planar part, a third curved part, a fourth planar part, and a fourth curved part connected in sequence; the plurality of first sliding grooves are uniformly distributed on the first planar part and the second planar part, and the plurality of first sliding members are uniformly distributed on the third planar part and the fourth planar part; or the plurality of first sliding members are uniformly distributed on the first planar part and the second planar part, and the plurality first sliding grooves are uniformly distributed on the third planar part and the fourth planar part.

21. The wheelchair according to claim 17, wherein: The first transmission mechanism comprises a driving member, a worm and a worm gear assembly, one end of the worm is connected with the driving member, the worm gear assembly is engaged with the worm, the worm gear assembly is internally provided with a screw thread, and the driving member is configured to drive the worm to rotate, so that the worm drives the worm gear assembly to rotate. The second transmission mechanism comprises a screw rod, the screw rod is arranged in the worm gear assembly and engaged with the screw thread, the worm gear assembly drives the screw rod to move linearly when the worm gear assembly rotates, and the screw rod drives the second seat body to slide relative to the first seat body.

22. The wheelchair according to claim 21, wherein: The worm gear assembly comprises a worm gear and a nut, the worm gear is engaged with the worm, the nut is arranged in the worm gear and fixedly connected with the worm gear, and the screw rod is arranged in the nut and engaged with the nut.

23. The wheelchair according to claim 21, wherein: The worm gear assembly comprises a worm gear, the worm gear is engaged with the worm, the worm gear is internally provided with a screw thread, and the screw rod is arranged in the worm gear and engaged with the screw thread in the worm gear.

24. The wheelchair according to claim 17, wherein: The second seat body comprises opposite top and bottom walls; One end of the second transmission mechanism is connected to the top wall through a first ball head, and the other end is connected to the bottom wall through a second ball head.

25. The wheelchair according to claim 24, wherein: The second seat body comprises an outer cylinder and an inner cylinder, the outer cylinder is sleeved with the first seat body, the top wall is located at the top of the outer cylinder, and the bottom wall is located at the bottom of the outer cylinder; The inner cylinder is arranged in the outer cylinder, the second transmission mechanism is arranged in the inner cylinder, the top of the inner cylinder is clamped between one end of the second transmission mechanism and the first ball head, and the bottom of the inner cylinder is clamped between the other end of the second transmission mechanism and the second ball head.

26. The wheelchair according to claim 25, wherein: One side of the inner cylinder is provided with an opening, and the other side is provided with a side wall; The lifting mechanism further comprises a mounting seat, the mounting seat is arranged in the outer cylinder, the mounting seat is fixedly connected with the first seat body through a connecting structure, the mounting seat abuts against the side wall and can slide relative to the side wall, and the first transmission mechanism is arranged in the mounting seat.

27. The wheelchair according to claim 26, wherein: A second sliding member is arranged on the mounting seat, the side wall of the inner cylinder is provided with a second sliding groove, and the second sliding member is opposite to the second sliding groove; When the second seat body slides relative to the first seat body, the second sliding member slides along the second sliding groove. Further comprising:

28. The wheelchair of claim 27, wherein, A photoelectric sensor, the photoelectric sensor comprises a signal transmitter and a signal receiver which are separately arranged; The signal transmitter is arranged in the mounting seat, and the signal receiver is arranged in the inner cylinder; or, the signal transmitter is arranged in the inner cylinder, and the signal receiver is arranged in the mounting seat; When the signal transmitter is opposite to the signal receiver, the signal receiver receives the signal emitted by the signal transmitter. Further comprising:

29. The wheelchair of claim 27, wherein, A light shielding member arranged in the mounting seat; ​ The photoelectric sensor comprises a signal transmitter and a signal receiver which are arranged separately, and the signal transmitter and the signal receiver are arranged on the inner cylinder and located oppositely on both sides of the moving path of the light shielding member, and the signal receiver is configured to receive the signal transmitted by the signal transmitter. When the light shielding member moves to between the signal transmitter and the signal receiver, the light shielding member blocks the signal transmitted by the signal transmitter.

30. A lifting mechanism of a wheelchair, comprising: a second seat body, an outer wall of the second seat body being spaced apart with a plurality of first sliding grooves; a first seat body, the first seat body being sleeved on an outer side of the second seat body, an inner wall of the first seat body being spaced apart with a plurality of first sliding members, each of the first sliding members being opposite to one of the first sliding grooves, and each of the first sliding members being capable of sliding along the first sliding groove; a first transmission mechanism, the first transmission mechanism being connected with the first seat body; a second transmission mechanism, the second transmission mechanism being connected with the second seat body, and the second transmission mechanism being coupled with the first transmission mechanism; the first transmission mechanism being capable of driving the second transmission mechanism, so that the second transmission mechanism drives the second seat body to slide relative to the first seat body.

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