An exit position sensor switch for a wheelchair lift

Abstract

This utility model relates to the field of vehicle parts technology, specifically a wheelchair lift exit position sensing switch device. It includes a contact block on the platform and a limit switch on the main arm. Exit is controlled via a hand controller. Upon receiving an exit signal, when the hydraulic cylinder pressurizes at a normal speed, the contact block rises and contacts the limit switch, sending contact information back to the control unit. Upon receiving this information, the control unit controls the hydraulic cylinder to depressurize until the contact block descends and disengages from the limit switch. The control unit then determines that the platform has reached the exit position. If the hydraulic cylinder pressurizes too quickly, the platform rises too high, the contact block rises above the limit switch and disengages, and the control unit continues to control the hydraulic cylinder to depressurize. The contact block descends and contacts the limit switch again before disengaging, and the control unit can still determine that the platform has reached the exit position. This solves the technical problem in existing wheelchair lift devices where the exit switch is too sensitive, inconvenient to adjust, and unable to ensure the platform is in the exit position.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, specifically to an exit position sensing switch device for a wheelchair lift. Background Technology

[0002] Existing wheelchair lifting devices include a frame installed inside the vehicle body (such as in the space below the floor panel at the vehicle door), a drive unit and a platform driven by the drive unit are installed inside the frame, the drive unit includes a guide frame disposed at one end of the platform and moving horizontally within the frame along with the platform, a hydraulic cylinder is disposed inside the guide frame, a rotating component is connected to the piston rod of the hydraulic cylinder, the rotating component is disposed at the end of the guide frame near the platform, a main arm is connected to the rotating component, the force-bearing end of the main arm is connected to the rotating component and driven by the hydraulic cylinder, and the action end of the main arm is hinged to the platform, the platform needs to first move horizontally to extend out of the frame, and then move up and down after extending out of the frame, the extended platform can be laid between the vehicle floor and the external ground to form a ramp, so that people with disabilities can enter the vehicle body in wheelchairs by crossing the ramp.

[0003] However, existing wheelchair lifting devices are inconvenient to adjust because their exit switches are too sensitive. Specifically, in the initial state, the platform is sunk against the bottom plate of the frame. The hydraulic cylinder needs to drive the platform to rise inside the frame first so that the platform is no longer sunk against the bottom plate of the frame. At the same time, the platform cannot rise too high and touch the top plate of the frame. Only when the platform is in the exit position within the appropriate height range can the platform be moved out of the frame. Summary of the Invention

[0004] To address the technical problem in existing wheelchair lifts where the exit switch is too sensitive and difficult to adjust, thus failing to ensure the platform is in the exit position, this application proposes an exit position sensing switch device for wheelchair lifts, which solves the aforementioned technical problem.

[0005] The technical solution adopted by this utility model to solve its technical problem is: This utility model provides an exit position sensing switch device for a wheelchair lift. The wheelchair lift includes a fixed compartment, a drive unit and a platform driven by the drive unit are arranged inside the fixed compartment. The drive unit includes a guide frame arranged at one end of the platform and moving horizontally within the fixed compartment along with the platform. A hydraulic cylinder for driving the platform to rise and fall is arranged inside the guide frame. A rotating component is connected to the piston rod of the hydraulic cylinder. The rotating component is arranged at the end of the guide frame near the platform and a main arm is connected to the rotating component. The force-bearing end of the main arm is connected to the rotating component and driven by the hydraulic cylinder. The working end of the main arm is hinged to the platform. A clearance space is provided at the intersection of the vertical outer edge of the platform and the movable part of the main arm to accommodate the exit position sensing switch device. The exit position sensing switch device includes: a contact stop block, which is assembled on the vertical outer edge of the platform; and a limit switch, which is assembled on the main arm at the position facing the vertical outer edge of the platform and located at the force-bearing end of the main arm. Between the control unit and the actuator; the control unit receives signals and controls the drive device. In the initial position, the contact stop is located below the limit switch. After receiving the exit signal, the control unit controls the hydraulic cylinder to pressurize so that the platform is raised within the frame. When the hydraulic cylinder pressurization speed is normal, the contact stop rises and contacts the limit switch, and feeds back the contact information to the control unit. After receiving the contact information, the control unit controls the hydraulic cylinder to depressurize until the contact stop descends and disengages from the limit switch. At this time, the control unit determines that the platform has reached the exit position, and the platform is moved out of the fixed cabin. If the hydraulic cylinder pressurization speed is too fast, the platform is raised too high, the contact stop rises above the limit switch and disengages. The control unit still controls the hydraulic cylinder to depressurize, and the contact stop descends and contacts the limit switch before disengaging again. At this time, the control unit can still determine that the platform has reached the exit position, and the platform is moved out of the fixed cabin.

[0006] Furthermore, the contact of the limit switch is a roller, and the part of the contact block that contacts the roller includes the vertical surface of the contact block facing the roller, and two guide surfaces formed at the transition between the vertical surface and the top and bottom surfaces of the contact block.

[0007] Furthermore, the contact stop is arranged at the tail end of the platform near the guide frame. At the same time, the platform is also connected to the rotating component through an adjustable-length auxiliary arm to adjust the height of the tail end of the platform, thereby adjusting the vertical distance between the contact stop and the limit switch.

[0008] Furthermore, the auxiliary arm is disposed below the main arm and extends in the same direction. The auxiliary arm includes: a fixing member, the first end of which is connected to a rotating member, and the second end of which is connected to a length adjustment assembly; a length adjustment assembly, the length adjustment assembly including a screw, the first end of which is connected to the fixing member via a positive thread, and the second end of which is connected to the auxiliary rod body via a negative thread; and an auxiliary rod body, the first end of which is connected to the length adjustment assembly, and the second end of which is connected to the platform.

[0009] Furthermore, the contact block is connected to the platform via a first connector, on which a first oblong hole extending horizontally is formed, and the first connector is screwed to the platform through the first oblong hole.

[0010] Furthermore, the limit switch is fixedly connected to the main arm via a second connector.

[0011] Furthermore, the drive device also includes a translation module, which includes a rack arranged along the translation direction of the platform and a drive gear meshing on the rack. The rack is fixed to the fixed compartment, and the drive gear is arranged on the guide frame.

[0012] Furthermore, a drive motor is fixed inside the guide frame, and the drive motor is used to drive the drive gear.

[0013] Furthermore, the guide frame is also equipped with a guide wheel that engages with the smooth portion on the back of the rack.

[0014] Based on the above technical solution, the technical effects that this utility model can achieve are as follows: This utility model discloses an exit position sensing switch device for a wheelchair lift. Based on the working principle of the wheelchair lift, when the platform exits the cabin, a large angle can be generated between the main arm and the platform through a small displacement, which can meet the triggering conditions of the limit switch. Therefore, a clearance space is left at the intersection of the vertical outer edge of the platform and the moving part of the main arm to install the exit position sensing switch device, including a stop block mounted on the platform and a limit switch on the main arm. This ensures that the platform moves to the exit position, and can ensure that the movement to the exit position is achieved under both normal and excessively fast cylinder pressurization speeds, thereby ensuring the stability of the platform's exit action and improving the fault tolerance rate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the wheelchair lift of this utility model; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3This is a schematic diagram of the initial position of the exit position sensing switch device for a wheelchair lift according to the present invention inside the cabin. Figure 4 for Figure 3 A partial enlarged view of the induction switch device for the middle exit compartment; Figure 5 This is a schematic diagram showing the contact stop rising and contacting the limit switch when the hydraulic cylinder of the wheelchair lift of this utility model is operating at a normal pressurization speed. Figure 6 for Figure 5 A partial enlarged view of the induction switch device for the middle exit compartment; Figure 7 This is a schematic diagram showing the process where, when the hydraulic cylinder of the wheelchair lift of this utility model is pressurized at a normal speed, the contact stop rises and contacts the limit switch, and feeds the contact information back to the control unit. After receiving the contact information, the control unit controls the hydraulic cylinder to depressurize until the contact stop falls and disengages from the limit switch. Figure 8 for Figure 7 A partial enlarged view of the induction switch device for the middle exit compartment; Figure 9 This is a schematic diagram of the platform of the wheelchair lift of this utility model being raised outside the fixed cabin; Figure 10 for Figure 9 A partial enlarged view of the induction switch device for the middle exit compartment; Figure 11 This is a schematic diagram of the cabin exit induction switch device of this utility model.

[0016] In this utility model: 1-fixed compartment; 2-drive device, 21-guide frame, 22-cylinder, 23-rotating component, 24-translation module, 241-rack, 242-drive gear, 243-drive motor, 244-guide wheel; 3-platform, 31-vertical outer side; 4-main arm, 41-sub-arm, 411-fixed component, 412-length adjustment component, 4121-screw, 4122-positive thread, 4123-negative thread, 413-sub-rod body; 5-contact stop, 51-vertical surface, 52-guide surface, 53-first connecting component; 6-limit switch, 61-roller, 62-second connecting component. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] like Figure 1-11 As shown (where Figure 9 and 10(The main arm 4 is already hidden in the middle). This utility model provides an exit position induction switch device for a wheelchair lift. The wheelchair lift includes a fixed compartment 1, a drive unit 2 and a platform 3 driven by the drive unit 2 are arranged in the fixed compartment 1. The drive unit 2 includes a guide frame 21 arranged at one end of the platform 3 and moving horizontally with the platform 3 in the fixed compartment 1. The guide frame 21 is arranged at one end of the platform 3 near the vehicle body. A hydraulic cylinder 22 is arranged in the guide frame 21 to drive the platform 3 to rise and fall. A rotating part 23 is connected to the piston rod of the hydraulic cylinder 22. The rotating component 23 is located at one end of the guide frame 21 near the platform 3. The main boom 4 is connected to the rotating component 23. The force-bearing end of the main boom 4 is connected to the rotating component 23 and driven by the hydraulic cylinder 22. The working end of the main boom 4 is hinged to the platform 3. A clearance space is provided at the intersection of the vertical outer edge 31 of the platform 3 and the movable part of the main boom 4 to accommodate the cabin position sensor switch device. The cabin position sensor switch device includes a contact stop 5, a limit switch 6, and a control unit. The contact stop 5 is mounted on the vertical outer edge 31 of the platform 3, and the limit switch 6 is mounted on... The main arm 4 is positioned on the outer vertical side 31 of the platform 3, between the force-bearing end and the action end of the main arm 4. The control unit receives the signal and controls the drive device 2. In the initial position, the contact stop 5 is located below the limit switch 6. The wheelchair lift is operated via the hand controller to exit the cabin. After receiving the exit signal, the control unit controls the hydraulic cylinder 22 to press down, causing the platform 3 to rise within the frame. When the hydraulic cylinder 22 presses down at a normal speed, the contact stop 5 rises and contacts the limit switch 6, and feeds back the contact information to the control unit. Upon receiving the contact information, the control unit controls the hydraulic cylinder 22 to depressurize until the contact stop 5 descends and disengages from the limit switch 6. At this point, the control unit determines that the platform 3 has reached the exit position, and the platform 3 is moved horizontally out of the fixed compartment 1. If the hydraulic cylinder 22 pressurizes too quickly, the platform 3 rises too high, and the contact stop 5 rises above the limit switch 6 and disengages. The control unit continues to control the hydraulic cylinder 22 to depressurize, and the contact stop 5 descends and contacts the limit switch 6 before disengaging again. At this point, the control unit can still determine that the platform 3 has reached the exit position, and the platform 3 is moved horizontally out of the fixed compartment 1. After the platform 3 is out of the fixed compartment 1, the hydraulic cylinder 22 pressurizes, and the platform 3 rises and falls outside the fixed compartment 1. During retraction, the exit position sensing switch device is used to ensure that the platform 3 is at the same height as the exit position outside the fixed compartment 1 before the platform 3 is retracted into the fixed compartment 1.

[0019] In a specific embodiment of this utility model, the contact of the limit switch 6 is a roller 61. The part of the contact block 5 that contacts the roller 61 includes the vertical surface 51 of the contact block 5 facing the roller 61, and two guide surfaces 52 formed at the transition between the vertical surface 51 and the top and bottom surfaces of the contact block 5. The guide surfaces 52 can be straight chamfered surfaces or rounded chamfered surfaces, so that the contact of the limit switch 6 can move smoothly between the vertical surface 51 and the two guide surfaces 52 without damage, thereby improving the service life of the equipment.

[0020] In a preferred embodiment of the present invention, the contact stop 5 is arranged at the tail end of the platform 3 near the guide frame 21. At the same time, the platform 3 is also connected to the rotating member 23 through an adjustable length auxiliary arm 41 to adjust the height of the tail end of the platform 3, thereby adjusting the distance between the contact stop 5 and the limit switch 6 in the vertical direction.

[0021] Specifically, the auxiliary arm 41 is positioned below the main arm 4 and extends in the same direction. The auxiliary arm 41 includes a fixing member 411. The first end of the fixing member 411 is connected to the rotating member 23, and the second end of the fixing member 411 is connected to the length adjustment assembly 412. The length adjustment assembly 412 includes a screw 4121. The first end of the screw 4121 is connected to the fixing member 411 via a straight thread 4122, and the second end of the screw 4121 is connected to the auxiliary rod body 413 via a reverse thread 4123. The first end of the auxiliary rod body 413 is connected to the length adjustment assembly 412, and the second end of the auxiliary rod body 413 is connected to the platform 3. The overall length of the auxiliary arm 41 is adjusted by adjusting the screw 4121.

[0022] Furthermore, the contact block 5 is connected to the platform 3 via the first connector 53. The first connector 53 has a first waist-shaped hole extending horizontally. The first connector 53 is screwed onto the platform 3 through the first waist-shaped hole, thereby enabling the contact block 5 to be adjusted in the horizontal direction during the debugging phase.

[0023] Furthermore, the distance between the contact stop 5 and the limit switch 6 in the vertical and horizontal directions can be adjusted by means of the adjustable length auxiliary arm 41 and the first connector 53.

[0024] In one specific embodiment of this utility model, the limit switch 6 is fixedly connected to the main arm 4 through the second connector 62. If a fixing through hole is opened on the second connector 62, the second connector 62 is screwed to the main arm 4 through the fixing through hole.

[0025] In a specific embodiment of this utility model, the drive device 2 of the wheelchair lift further includes a translation module 24. The translation module 24 includes a rack 241 arranged along the translation direction of the platform 3 and a drive gear 242 engaged on the rack 241. The rack 241 is fixed on the fixed compartment 1, and the drive gear 242 is arranged on the guide frame 21. The drive gear 242 meshes with the rack 241. After the drive gear 242 rotates, the guide frame 21, together with the platform 3, translates within the fixed compartment 1.

[0026] In one specific embodiment of this utility model, a drive motor 243 is fixed inside the guide frame 21, and the drive motor 243 is used to drive the drive gear 242.

[0027] In one specific embodiment of this utility model, a guide wheel 244 that cooperates with the smooth part on the back of the rack 241 is also provided inside the guide frame 21.

[0028] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention.

Claims

1. An exit position sensing switch device for a wheelchair lift, the wheelchair lift including a fixed compartment, a drive unit (2) and a platform (3) driven by the drive unit (2) are arranged in the fixed compartment (1), the drive unit (2) includes a guide frame (21) arranged at one end of the platform (3) and moving in translation with the platform (3) in the fixed compartment (1), a hydraulic cylinder (22) for driving the platform (3) to rise and fall is arranged in the guide frame (21), a rotating part (23) is connected to the piston rod of the hydraulic cylinder (22), the rotating part (23) is arranged at one end of the guide frame (21) near the platform (3), a main arm (4) is connected to the rotating part (23), the force-bearing end of the main arm (4) is connected to the rotating part (23) and driven by the hydraulic cylinder (22), and the working end of the main arm (4) is hinged to the platform (3), characterized in that, A clearance space is provided at the intersection of the vertical outer side (31) of the platform (3) and the movable part of the main arm (4) to accommodate the exit position sensor switch device, which includes: Contact block (5), the contact block (5) is mounted on the vertical outer side (31) of the platform (3); Limit switch (6), the limit switch (6) is mounted on the arm body of the main arm (4) facing the vertical outer side (31) of the platform (3), and is located between the force-receiving end and the action end of the arm body of the main arm (4); The control unit receives signals and controls the drive device (2). In the initial position, the contact block (5) is located below the limit switch (6). After receiving the exit signal, the control unit controls the hydraulic cylinder (22) to pressurize so that the platform (3) is raised within the frame. When the hydraulic cylinder (22) pressurizes at a normal speed, the contact block (5) rises and contacts the limit switch (6), and feeds back the contact information to the control unit. After receiving the contact information, the control unit controls the hydraulic cylinder (22) to depressurize until the contact block (5) descends and contacts the limit switch (6). When the limit switch (6) is disengaged, the control unit determines that the platform (3) has reached the exit position and the platform (3) is moved out of the fixed compartment (1). When the hydraulic cylinder (22) pressurizes too fast, the platform (3) is raised too high. The contact block (5) rises above the limit switch (6) and disengages. The control unit still controls the hydraulic cylinder (22) to depressurize. The contact block (5) descends and contacts the limit switch (6) and disengages again. At this time, the control unit can still determine that the platform (3) has reached the exit position and the platform (3) is moved out of the fixed compartment (1).

2. The exit position sensing switch device for a wheelchair lift according to claim 1, characterized in that, The contact of the limit switch (6) is a roller (61). The part of the contact block (5) that contacts the roller (61) includes the vertical surface (51) of the contact block (5) facing the roller (61), and two guide surfaces (52) formed at the transition between the vertical surface (51) and the top and bottom surfaces of the contact block (5).

3. The exit position sensing switch device for a wheelchair lift according to claim 1, characterized in that, The contact block (5) is arranged at the tail end of the platform (3) near the guide frame (21). At the same time, the platform (3) is also connected to the rotating part (23) through an adjustable length auxiliary arm (41) to adjust the height of the tail end of the platform (3), thereby adjusting the distance between the contact block (5) and the limit switch (6) in the vertical direction.

4. The exit position sensing switch device for a wheelchair lift according to claim 3, characterized in that, The auxiliary arm (41) is positioned below the main arm (4) and extends in the same direction. The auxiliary arm (41) includes: A fixing member (411) has its first end connected to a rotating member (23) and its second end connected to a length adjusting assembly (412). The length component (412) includes a screw (4121), the first end of which is connected to the fixing member (411) via a positive thread (4122), and the second end of which is connected to the auxiliary rod body (413) via a reverse thread (4123). The secondary rod (413) has its first end connected to the length adjustment assembly (412) and its second end connected to the platform (3).

5. The exit position sensing switch device for a wheelchair lift according to claim 4, characterized in that, The contact block (5) is connected to the platform (3) through the first connector (53), and a first waist-shaped hole extending horizontally is formed on the first connector (53). The first connector (53) is screwed to the platform (3) through the first waist-shaped hole.

6. The exit position sensing switch device for a wheelchair lift according to claim 1, characterized in that, The limit switch (6) is fixedly connected to the main arm (4) via the second connector (62).

7. The exit position sensing switch device for a wheelchair lift according to claim 1, characterized in that, The drive unit (2) also includes a translation module (24), which includes a rack (241) arranged along the translation direction of the platform (3) and a drive gear (242) meshing on the rack (241). The rack (241) is fixed on the fixed compartment (1), and the drive gear (242) is arranged on the guide frame (21).

8. The exit position sensing switch device for a wheelchair lift according to claim 7, characterized in that, A drive motor (243) is fixed inside the guide frame (21), and the drive motor (243) is used to drive the drive gear (242).

9. The exit position sensing switch device for a wheelchair lift according to claim 7, characterized in that, The guide frame (21) is also equipped with a guide wheel (244) that cooperates with the smooth part on the back of the rack (241).

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