Driving wheel lifting mechanism and electric transfer vehicle

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a driving wheel lifting mechanism and an electric transfer vehicle. The driving wheel lifting mechanism comprises a driving wheel, a spring, a guide column, a guide sleeve, a sliding rail, a sliding wedge block, a mounting plate and a pusher; a sliding rail and a pusher are arranged on the bottom surface of the mounting plate, a sliding wedge block is arranged on the sliding rail, and the pusher pushes the sliding wedge block to move along the sliding rail; a guide groove is formed in the sliding wedge block, a sliding column is arranged in the guide groove and connected with a guide column, the guide column is sleeved with a guide sleeve, the lower end of the guide column is connected with a driving wheel installation frame, the driving wheel installation frame is connected with a driving wheel, and a spring is arranged on the guide column between the guide sleeve and the driving wheel installation frame in a sleeved mode. According to the utility model, the pusher drives the sliding wedge block to move horizontally, and the guide post is matched with the guide groove to convert into a vertical movement structure for driving the wheel to lift.

Description

Technical Field

[0001] This utility model belongs to the field of medical equipment technology, specifically a drive wheel lifting mechanism and an electric transfer vehicle. Background Technology

[0002] Electric transfer vehicles (such as electric hospital bed transfer vehicles and patient transfer machines) typically use motor-driven wheel sets for movement. However, in existing technologies, the drive wheels are mostly fixedly installed, making it impossible to adjust their height or remove them from the ground according to the usage scenario. This leads to the following problems:

[0003] (1) Poor adaptability to the ground

[0004] Unable to adapt to uneven floors: Operating room or ward floors may have thresholds, slopes, or slight bumps (such as cable trays), causing the fixed-height drive wheels to easily get stuck or slip. Hard drive wheels damage the floor: Some electric transfer carts use high-friction rubber drive wheels, which may cause scratches or wear when turning on fragile floors (such as PVC or epoxy resin) for extended periods.

[0005] (2) Manual pushing is subject to great resistance.

[0006] Motor reverse drag issue: When the electric transfer cart needs to switch to manual mode (e.g., when the battery is depleted or in an emergency), the fixed drive wheels, due to their direct mechanical connection to the motor, generate significant rolling resistance (test data: ≥50N thrust requirement), increasing the operational burden on medical staff. Inability to completely detach from the ground: Although some models support a "neutral" mode, the drive wheels remain in contact with the ground, resulting in ineffective frictional wear.

[0007] (3) Limited spatial mobility

[0008] Insufficient steering flexibility: In confined spaces (e.g., the gap between the operating table and the wall <80cm), fixed drive wheels may limit the vehicle's small-radius steering, requiring multiple adjustments to achieve positioning. Inability to adapt to varying load conditions: When the load on the transfer cart changes (e.g., differences in patient weight), the fixed-height drive wheels may cause the vehicle to tilt, affecting stability.

[0009] Therefore, it is necessary to develop a mechanism that allows the drive wheels to be freely adjusted and to install this mechanism on an electric transfer vehicle. Utility Model Content

[0010] The purpose of this utility model is to overcome the defects of the existing technology and propose a drive wheel lifting mechanism that can lift the drive wheel in a narrow space and push it from the side to realize the lateral movement of the transfer vehicle. At the same time, when the electric transfer vehicle passes the threshold, the electric drive wheel can be lifted to avoid excessive load and damage to the drive wheel.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A drive wheel lifting mechanism includes a drive wheel, a spring, a guide column, a guide sleeve, a slide rail, a sliding wedge, a mounting plate, and a pusher.

[0013] The bottom surface of the mounting plate is provided with a slide rail and a pusher. A sliding wedge is provided on the slide rail, and the pusher pushes the sliding wedge to move along the slide rail.

[0014] The sliding wedge is provided with a guide groove, and a sliding post is provided in the guide groove. The sliding post is connected to the guide post, and a guide sleeve is fitted on the guide post. The lower end of the guide post is connected to the drive wheel mounting bracket, and the drive wheel mounting bracket is connected to the drive wheel. A spring is fitted on the guide post between the guide sleeve and the drive wheel mounting bracket.

[0015] Preferably, the angle between the guide groove and the slide rail is 45°.

[0016] Preferably, the actuator is an electric push rod, a hydraulic push rod, or a hydraulic cylinder.

[0017] This utility model also provides an electric transfer vehicle, which includes a bottom frame, a top frame, and a push rod. The bottom frame and the top frame are connected by a support column, and the top frame is connected to the push rod. The front end of the bottom frame is connected to two front wheels, and the rear end is connected to two rear wheels.

[0018] The aforementioned drive wheel lifting mechanism is installed on the bottom frame.

[0019] Preferably, the mounting plate is fixed to the bottom frame by a connecting plate, and the guide sleeve is fixed to the bottom frame.

[0020] This utility model uses a pusher to drive the sliding wedge block to move horizontally, and then uses a guide post and guide groove to convert it into a vertical motion structure for the drive wheel to lift.

[0021] This invention enables the electric transfer cart to move laterally, while effectively protecting the drive wheel structure when crossing obstacles such as thresholds. When manually pushing, turning in narrow spaces, or on uneven ground, the drive wheels can be raised to reduce resistance or avoid interference; the ground pressure of the drive wheels is dynamically adjusted according to the patient's weight to ensure stability and balance of driving force. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the drive wheel lifting mechanism of this utility model;

[0023] Figure 2 This is a schematic diagram showing the installation position of the drive wheel lifting mechanism of this utility model on the transfer vehicle;

[0024] Figure 3 This is a structural schematic diagram of the electric transfer vehicle of this utility model;

[0025] Figure 4 This is a schematic diagram of the drive wheels in a lowered state;

[0026] Figure 5 This is a schematic diagram of the drive wheel in the upward state.

[0027] Figure label:

[0028] 1. Drive wheel; 2. Spring; 3. Guide sleeve; 4. Guide column; 5. Slide rail; 6. Sliding wedge; 7. Mounting plate; 8. Pusher; 9. Sliding column; 10. Drive wheel mounting bracket; 11. Guide groove; 12. Connecting plate; 13. Bottom frame; 14. Top frame; 15. Push handle; 16. Support column. Detailed Implementation

[0029] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0030] Example 1

[0031] like Figure 1 As shown, a drive wheel lifting mechanism includes a drive wheel 1, a spring 2, a guide sleeve 3, a guide column 4, a slide rail 5, a sliding wedge 6, a mounting plate 7, and a pusher 8.

[0032] The bottom surface of the mounting plate 7 is provided with a slide rail 5 and a pusher 8. A sliding wedge 6 is provided on the slide rail 5. The pusher 8 pushes the sliding wedge 6 to move along the slide rail 5.

[0033] The sliding wedge 6 is provided with a guide groove 11, and a sliding post 9 is provided in the guide groove 11. The sliding post 9 is connected to the guide post 4. A guide sleeve 3 is fitted on the guide post 4. The lower end of the guide post 4 is connected to the drive wheel mounting bracket 10. The drive wheel mounting bracket 10 is connected to the drive wheel 1. A spring 2 is fitted on the guide post 4 between the guide sleeve 3 and the drive wheel mounting bracket 10.

[0034] The angle between the guide groove 11 and the slide rail 5 is 45°. This angle can also be set to other angles as needed, as long as it can realize the conversion of horizontal movement to vertical up and down movement.

[0035] The actuator 8 is an electric actuator, a hydraulic actuator, or a hydraulic cylinder. Electric actuators, hydraulic actuators, or hydraulic cylinders are all conventionally used components in the field and can be purchased.

[0036] One end of the pusher 8 is fixed to the mounting plate 7, and the other end is connected to the sliding wedge 6. The slide rail 5 is connected to the mounting plate 7, and the sliding wedge 6 is connected to the slide rail 5, allowing it to slide inside the slide rail 5. The drive wheel 1 is connected to the spring 2 and the guide post 4. The spring 2 can extend and retract within a certain range to provide shock absorption. Its top end is connected to the guide sleeve 3, which is fixed to the bottom frame 13. The guide post 4 is connected to the guide groove 11 of the sliding wedge 6. During the lifting and lowering motion, the guide sleeve 3 remains stationary, while the guide post 4 moves up and down within the guide sleeve 3.

[0037] like Figure 4 As shown, drive wheel 1 is in the lowest position; as Figure 5 As shown, drive wheel 1 is in its highest position; by Figure 5 Towards Figure 4 During operation; the guide sleeve 3 and mounting plate 7 are installed onto the base frame 13 of the transfer vehicle. The electric push rod extends, the sliding wedge 6 slides forward in the slide rail 5, the guide sleeve 3 restricts the guide post 4 from sliding forward, the guide post 4 slides downward under pressure, and the drive wheel 1 descends. The reverse process is similar. Figure 4 Towards Figure 5 During movement, the electric push rod retracts, the sliding wedge 6 slides backward within the slide rail 5, the guide sleeve 3 restricts the guide post 4 to slide backward, the guide post 4 slides upward, and the drive wheel 1 rises, the movement path is as follows. Figure 4 As shown by the red arrow in the image.

[0038] Example 2

[0039] like Figure 3 As shown, an electric transfer vehicle includes a bottom frame 13, a top frame 14, and a push rod 15. The bottom frame 13 and the top frame 14 are connected by a support column 16, and the top frame 14 is connected to the push rod 15. The bottom frame 13 is connected to two front wheels at the front end and two rear wheels at the rear end.

[0040] The drive wheel lifting mechanism described in Embodiment 1 is provided on the bottom frame 13, and two drive wheel lifting mechanisms can be arranged opposite each other on both sides of the bottom frame 13.

[0041] The mounting plate 7 of the drive wheel lifting mechanism is fixed to the base frame 13 by the connecting plate 12, and the guide sleeve 3 is fixed to the base frame 13. When the pusher 8 pushes the sliding wedge 6 to move, the guide sleeve 3 remains stationary.

[0042] In this invention, the lateral movement of the transfer vehicle can be achieved by pushing from the side after both drive wheels are raised. When crossing a threshold, the drive wheels can also be raised to protect the drive wheel structure and prevent damage to the drive motor.

[0043] For any content not described in detail in this utility model, conventional technical knowledge in the field can be used.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A drive wheel lifting mechanism, characterized in that, The drive wheel lifting mechanism includes a drive wheel, a spring, a guide column, a guide sleeve, a slide rail, a sliding wedge, a mounting plate, and a pusher; The bottom surface of the mounting plate is provided with a slide rail and a pusher. A sliding wedge is provided on the slide rail, and the pusher pushes the sliding wedge to move along the slide rail. The sliding wedge is provided with a guide groove, and a sliding post is provided in the guide groove. The sliding post is connected to the guide post, and a guide sleeve is fitted on the guide post. The lower end of the guide post is connected to the drive wheel mounting bracket, and the drive wheel mounting bracket is connected to the drive wheel. A spring is fitted on the guide post between the guide sleeve and the drive wheel mounting bracket.

2. The drive wheel lifting mechanism according to claim 1, characterized in that, The angle between the guide groove and the slide rail is 45°.

3. The drive wheel lifting mechanism according to claim 1, characterized in that, The actuator is an electric push rod or a hydraulic push rod.

4. An electric transfer vehicle, characterized in that, The electric transfer vehicle adopts the drive wheel lifting mechanism as described in any one of claims 1-3.

5. The electric transfer vehicle according to claim 4, characterized in that, The mounting plate is fixed to the bottom frame of the electric transfer vehicle via the connecting plate, and the guide sleeve is fixed to the bottom frame.

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