Electromagnetic damping automatic brake device for baby carriage

Abstract

The utility model relates to the technical field of baby carriages, and provides a baby carriage electromagnetic damping automatic brake device which comprises a carriage frame, the carriage frame is connected with a first wheel and a second wheel, and magnets are arranged on the carriage frame and around the first wheel; a hub of the first wheel is provided with a first conductor, and the first conductor is connected with the input end of the controller through a wire; a fixing frame is further arranged at the position, at the joint of the second wheel and the frame, of the frame, a solenoid is wound on the fixing frame in a non-uniform mode, and the solenoid is electrically connected with the output end of the controller to generate a non-uniform magnetic field. A hub of the second wheel is provided with a second conductor capable of moving relative to the non-uniform magnetic field. According to the utility model, electromagnetic braking is realized, the braking force can be automatically adjusted according to the actual speed, and the safety of the baby carriage in various speed states is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of baby carriages, in particular to an electromagnetic damping automatic brake device for a baby carriage. Background Art

[0002] As a means of transportation designed specifically for infants, strollers are directly related to their health and comfort. With technological advancements, many smart strollers have emerged on the market. These products incorporate intelligent technology and add features such as lighting and music playback, further enhancing their convenience and entertainment. However, while these intelligent designs offer enhanced functionality, they still lack sufficient consideration for safety. In actual use, the safety protection mechanisms for emergencies still have loopholes and cannot fully guarantee the safety of infants.

[0003] While many smart strollers currently incorporate automated driving and remote control features, their speed control and braking systems are often imprecise. If parents lose control of the stroller, or encounter unexpected situations such as excessive speed, uneven terrain, or collisions with obstacles, the stroller's deceleration or emergency braking often won't take effect in time, potentially resulting in injury to the baby or even more serious accidents. Furthermore, existing smart strollers often rely on manual braking or limited automated control, making them unable to brake in time when encountering obstacles or emergencies, increasing the risk of accidents. Utility Model Content

[0004] In order to overcome the defect of the prior art that the baby carriage cannot brake automatically when the speed is out of control, the utility model provides an electromagnetic damping automatic braking device for the baby carriage.

[0005] In order to solve the above technical problems, the technical solutions of the present utility model are as follows:

[0006] An electromagnetic damping automatic brake device for a baby stroller includes a frame, a first wheel and a second wheel connected to the frame, a magnet disposed on the frame and around the first wheel; a first conductor disposed on the hub of the first wheel, the first conductor being connected to an input terminal of a controller via a wire;

[0007] The frame is further provided with a fixed frame at the connection between the second wheel and the frame, and a solenoid is unevenly wound on the fixed frame, and the solenoid is electrically connected to the output end of the controller to generate an uneven magnetic field;

[0008] A second conductor capable of moving relative to the non-uniform magnetic field is provided on the hub of the second wheel.

[0009] As a preferred solution, the magnet is a U-shaped magnet, and the opening of the U-shaped magnet is arranged toward the first wheel.

[0010] As a preferred solution, the frame is provided with a connecting rod, the hub of the second wheel is connected to the bearing on the connecting rod, the fixed frame is fixedly connected to the connecting rod, and the hub of the second wheel is located on the periphery of the fixed frame.

[0011] As a preferred solution, the controller 6 includes a speed measuring module and a braking module, the input end of the speed measuring module is connected to the first conductor, the output end of the speed measuring module is connected to the input end of the braking module, and the output end of the braking module is connected to the second conductor.

[0012] As a preferred solution, a diode is provided inside the speed measurement module, an input end of the diode is connected to the first conductor, and an output end of the diode is connected to the brake module.

[0013] As a preferred solution, the handle of the frame is provided with a pressure sensing device, and the controller is also provided with a pressure detection module. The output end of the pressure sensing device is connected to the input end of the pressure detection module, the output end of the pressure detection module and the output end of the speed measurement module are respectively connected to the input end of the discriminator, and the output end of the discriminator is connected to the brake module.

[0014] As a preferred solution, the speed measurement module is further provided with a knob resistor, one end of the knob resistor is connected to the input end of the diode, and the other end is connected to the first conductor.

[0015] As a preferred solution, the brake module is provided with a transistor, the base of the transistor is connected to the output end of the speed measurement module, the collector of the transistor is connected to the amplifying power supply, and the emitter of the transistor is connected to the second conductor.

[0016] As a preferred solution, the pressure sensing device includes a force-sensitive resistor.

[0017] As a preferred solution, the controller is fixed to the vehicle frame via a fixing device.

[0018] Compared to existing technologies, this new solution offers the following benefits: When the first wheel rolls, electromagnetic induction generates a current within the conductor, which flows into the controller, increasing with increasing vehicle speed. The controller then outputs this current to the solenoid, generating eddy currents within the circular conductor due to Lenz's law. This eddy current impedes the tire's rolling motion, slowing the stroller and ultimately braking it. This new solution offers contactless operation, rapid response, and precise control. It automatically adjusts braking force based on actual vehicle speed, significantly improving stroller safety at all speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the electromagnetic damping automatic brake device for a baby carriage of the present invention.

[0020] Figure 2 This is an axonometric view of the second wheel structure of Example 1.

[0021] Figure 3 This is a top view of the second wheel structure of Example 1.

[0022] Figure 4 This is the circuit diagram of the speed measurement module of Example 2.

[0023] Figure 5 This is the circuit diagram of the brake module of Example 2.

[0024] Figure 6 This is the circuit diagram of the pressure detection module of Example 3.

[0025] Figure 7 This is a structural diagram of the fixing device of Example 4.

[0026] Among them, 1-frame, 101-connecting rod, 102-bearing, 2-first wheel, 3-second wheel, 301-hub of the second wheel, 4-magnet, 5-first conductor, 6-controller, 601-fixing device, 7-second conductor, 8-fixing frame, 801-solenoid, 9-pressure sensing device. DETAILED DESCRIPTION

[0027] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting this patent;

[0028] In order to better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size;

[0029] It is understandable to those skilled in the art that some well-known structures and descriptions thereof may be omitted in the drawings.

[0030] The technical solution of the present utility model is further described below with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] This embodiment provides an electromagnetic damping automatic brake device for a baby carriage. Figure 1 FIG. 1 is a schematic diagram of the structure of the electromagnetic damping automatic brake device for a baby carriage according to the present invention; Figure 2 FIG. 1 is a schematic structural diagram of the second wheel of the present invention.

[0033] The electromagnetic damping automatic brake device for a baby stroller proposed in this embodiment includes a frame 1, to which a first wheel 2 and a second wheel 3 are connected. A magnet 4 is provided on the frame 1 and around the first wheel 2. A first conductor 5 is provided on the hub of the first wheel 2, and the first conductor 5 is connected to the input end of a controller 6 via a wire.

[0034] The frame 1 is further provided with a fixed frame 8 at the connection between the second wheel 3 and the frame 1 , and a solenoid 801 is unevenly wound on the fixed frame 8 , and the solenoid 801 is electrically connected to the output end of the controller 6 to generate an uneven magnetic field;

[0035] The hub 301 of the second wheel 3 is provided with a second conductor 7 capable of relative movement with the non-uniform magnetic field.

[0036] As an exemplary illustration, both the first conductor 2 and the second conductor 3 include a ferrous metal structure.

[0037] In this embodiment, two second wheels 3 are connected to one side of the handlebar of the frame 1, and two first wheels 2 are connected to the other side. When the stroller moves, the first wheels 2 roll, driving the conductor to cut magnetic flux lines in the magnetic field generated by the magnet and generate current, which flows into a controller. The controller outputs current to a solenoid. The solenoid, unevenly wound around the fixed frame 8, generates a magnetic field of uneven strength in the space where the second wheels 3 are located, thereby causing eddy currents to be generated within the rolling second conductors 7, hindering the rolling of the tire and achieving automatic braking. This embodiment automatically senses the speed of the stroller by the movement of the wheels. When the speed increases, the current generated by the first conductors 5 increases, and the current output by the controller 6 to the solenoids increases accordingly, resulting in a corresponding increase in the magnetic field strength, thereby generating a stronger eddy current braking force within the second conductors 7. This enables the stroller to quickly and effectively decelerate at high speeds when encountering downhill or other situations that may cause unintended acceleration. Secondly, traditional mechanical braking methods rely on physical friction between the wheels and the brakes. However, the present invention uses electromagnetic braking to reduce direct contact and wear of mechanical components, thereby extending the service life of the brake system and reducing maintenance costs. In addition, an iron metal structure is used as the first conductor 5 and the second conductor 7. Iron metal has good electrical conductivity and magnetic permeability. During the movement of the wheel, the first conductor of the iron metal structure can generate a strong induced current when cutting the magnetic field, thereby improving the acquisition accuracy and current intensity of the vehicle speed signal. The high magnetic permeability of the iron metal enables the second conductor to more effectively generate eddy currents when rolling in the solenoid magnetic field, forming a stronger reaction force, increasing the resistance to wheel rolling, and significantly improving the braking force and braking effect. Furthermore, the iron metal structure has good mechanical strength and durability, and can maintain a stable structural form under high-intensity electromagnetic forces, avoiding system failure problems caused by material deformation or damage.

[0038] In an optional embodiment, the magnet 4 is a U-shaped magnet, and the opening of the U-shaped magnet is arranged toward the first wheel 2 .

[0039] Further optionally, the first conductor 5 provided on the first wheel 2 is located inside the opening of the U-shaped magnet.

[0040] In this embodiment, a U-shaped magnet is used to generate a magnetic field in the space where the first wheel 2 is located. The U-shaped magnet has a stronger magnetic field concentration effect than an ordinary bar magnet. Its opening facing the first wheel can form a strong and stable magnetic field distribution at the opening, and make the magnetic lines of force pass through the conductor on the first wheel more concentratedly, ensuring that when the first wheel rotates, the first conductor is always subjected to a stable and strong magnetic field, thereby improving the generation efficiency and stability of the induced current.

[0041] In an optional embodiment, the vehicle frame 1 is provided with a connecting rod 101 , the hub 301 of the second wheel 3 is connected to the bearing 102 on the connecting rod 101 , and the hub 301 of the second wheel is located on the periphery of the fixed frame 8 .

[0042] like Figure 2 As shown, it is an axonometric view of the second wheel structure in this embodiment; Figure 3 , which is a top view of the second wheel structure in this embodiment.

[0043] In this embodiment, the hub 301 of the second wheel is fixed to the connecting rod 101 by a bearing, the outer surface of the hub 301 of the second wheel is covered with a tire, and the hub 301 of the second wheel is set to a hollow cylindrical structure. The fixed frame 8 with the solenoid 801 is fixedly connected to the connecting rod 101 and is located in the hub 301 of the second wheel, ensuring that the fixed frame does not rotate when the hub of the second wheel rotates; placing the fixed frame 8 and the solenoid 801 in the internal space of the hub 301 can make the magnetic field generated by the solenoid act more concentratedly on the second conductor 7 set on the hub 301 of the second wheel. Since the space inside the hub is relatively closed, the loss of the magnetic field will be significantly reduced, thereby greatly improving the strength and utilization efficiency of the magnetic field and enhancing the electromagnetic induction effect.

[0044] Example 2

[0045] This embodiment makes improvements based on the electromagnetic damping automatic brake device for the baby carriage proposed in Embodiment 1.

[0046] The electromagnetic damping automatic brake device for a baby stroller proposed in this embodiment includes a frame 1, to which a first wheel 2 and a second wheel 3 are connected. A magnet 4 is provided on the frame 1 and around the first wheel 2. A first conductor 5 is provided on the hub of the first wheel 2, and the first conductor 5 is connected to the input end of a controller 6 via a wire.

[0047] The frame 1 is further provided with a fixed frame 8 at the connection between the second wheel 3 and the frame 1 , and a solenoid 801 is unevenly wound on the fixed frame 8 , and the solenoid 801 is electrically connected to the output end of the controller 6 to generate an uneven magnetic field;

[0048] The hub 301 of the second wheel 3 is provided with a second conductor 7 capable of relative movement with the non-uniform magnetic field.

[0049] In an optional embodiment, the controller 6 includes a speed measuring module and a braking module, the input end of the speed measuring module is connected to the first conductor 5, the output end of the speed measuring module is connected to the input end of the braking module, and the output end of the braking module is connected to the second conductor 7.

[0050] Further optionally, a diode is provided inside the speed measurement module, an input end of the diode is connected to the first conductor 5, and an output end of the diode is connected to the brake module.

[0051] like Figure 4 FIG. 1 is a circuit diagram of a speed measurement module according to an embodiment of the present invention.

[0052] In this embodiment, the speed measurement module is equipped with a diode connected in series with a protective resistor R, and a capacitor C connected in parallel with the diode and protective resistor R. The speed measurement module is connected to the first conductor, and the induced current signal generated by the module monitors the rotational speed of the wheel in real time. The speed signal is then transmitted to the brake module, which then outputs current to the second conductor, achieving real-time monitoring and braking of the vehicle speed. Furthermore, the conduction current of the diode sets a minimum speed threshold for brake intervention, ensuring that the stroller is not interfered with by the brake system when traveling at low speeds. The brake system only activates when the induced current exceeds the threshold, thereby improving driving stability at low speeds.

[0053] In an optional embodiment, the speed measurement module is further provided with a knob resistor, one end of the knob resistor is connected to the input end of the diode, and the other end of the knob resistor is connected to the first conductor 5 .

[0054] In this embodiment, a knob resistor is added between the diode and the input of the speed measurement module. This resistor is connected in series with the speed measurement module to divide the voltage. Increasing the resistance of the knob resistor increases the voltage divided, requiring a higher voltage to turn on the diode, thereby changing the minimum speed threshold. By flexibly adjusting the knob resistor, and thus the diode's turn-on voltage, users can flexibly set the speed threshold for brake activation based on actual needs, adapting to different usage environments and safety requirements, and improving the adaptability of the device.

[0055] In an optional embodiment, the brake module is provided with a transistor, the base of the transistor is connected to the output end of the speed measurement module, the collector of the transistor is connected to the amplifying power supply, and the emitter of the transistor is connected to the second conductor 7.

[0056] like Figure 5 Shown is the circuit diagram of the brake module of this embodiment.

[0057] Specifically, a switch S is provided between the emitter of the transistor and the solenoid in the brake module for directly controlling whether the brake function is enabled.

[0058] In this embodiment, when the base of the transistor receives a current signal from the speed measurement module, the current is amplified by the amplifier, so that a higher current flows into the second conductor, thereby generating a stronger braking force during the eddy current braking process, thereby improving the efficiency and effectiveness of the braking system and ensuring that the stroller can quickly and effectively slow down or stop when needed.

[0059] Example 3

[0060] This embodiment makes improvements based on the electromagnetic damping automatic brake device for baby carriages proposed in Embodiments 1 and 2.

[0061] The electromagnetic damping automatic brake device for a baby stroller proposed in this embodiment includes a frame 1, to which a first wheel 2 and a second wheel 3 are connected. A magnet 4 is provided on the frame 1 and around the first wheel 2. A first conductor 5 is provided on the hub of the first wheel 2, and the first conductor 5 is connected to the input end of a controller 6 via a wire.

[0062] The frame 1 is further provided with a fixed frame 8 at the connection between the second wheel 3 and the frame 1 , and a solenoid 801 is unevenly wound on the fixed frame 8 , and the solenoid 801 is electrically connected to the output end of the controller 6 to generate an uneven magnetic field;

[0063] The hub 301 of the second wheel 3 is provided with a second conductor 7 capable of relative movement with the non-uniform magnetic field.

[0064] In an optional embodiment, the controller is further provided with a pressure detection module, which includes a pressure sensing device 9 and a discriminator, and the pressure sensing device 9 is provided on the handle of the frame 1; the output end of the pressure detection module and the output end of the speed measurement module are respectively connected to the input end of the discriminator, and the output end of the discriminator is connected to the brake module.

[0065] As an exemplary explanation, the discriminator includes an OR gate or an AND gate.

[0066] like Figure 6 FIG. 1 is a circuit diagram of the pressure detection module of this embodiment.

[0067] Further optionally, the pressure sensing device 9 includes a force-sensitive resistor.

[0068] Specifically, the pressure sensing device is provided with two force-sensitive resistors, which are respectively connected to the input ends of the NOR gate, and the output of the NOR gate serves as the output of the pressure detection module; the pressure detection module is also provided with a button-type power supply which is respectively connected to the two force-sensitive resistors to provide power to the pressure detection module.

[0069] In this embodiment, the pressure-sensing device can detect whether the driver is holding the handlebars. Through the discriminator logic, when the discriminator is an AND gate, the driver operates the stroller normally, and the pressure-sensing device senses a valid pressure signal to inhibit the activation of the brake system. Even if the vehicle speed reaches the threshold, the braking function will not be activated due to misjudgment, ensuring that the stroller will not brake suddenly when someone is driving, avoiding safety problems caused by misoperation during driving. When the discriminator is an OR gate, even if the driver operates the stroller normally, the braking function will be activated when the vehicle speed reaches the threshold to prevent danger to the baby and the driver, such as excessive speed when going downhill. The logic of the discriminator can be flexibly selected according to the usage scenario.

[0070] Example 4

[0071] This embodiment makes improvements based on the electromagnetic damping automatic brake device for baby carriages proposed in Embodiments 1 to 3.

[0072] The electromagnetic damping automatic brake device for a baby stroller proposed in this embodiment includes a frame 1, to which a first wheel 2 and a second wheel 3 are connected. A magnet 4 is provided on the frame 1 and around the first wheel 2. A first conductor 5 is provided on the hub of the first wheel 2, and the first conductor 5 is connected to the input end of a controller 6 via a wire.

[0073] The frame 1 is further provided with a fixed frame 8 at the connection between the second wheel 3 and the frame 1 , and a solenoid 801 is unevenly wound on the fixed frame 8 , and the solenoid 801 is electrically connected to the output end of the controller 6 to generate an uneven magnetic field;

[0074] The hub 301 of the second wheel 3 is provided with a second conductor 7 capable of relative movement with the non-uniform magnetic field.

[0075] In an optional embodiment, the controller 6 is fixed to the vehicle frame 1 via a fixing device 601 .

[0076] As an exemplary illustration, the fixing device 601 is a mechanical gripper.

[0077] like Figure 7 FIG. 1 is a structural diagram of the fixing device of this embodiment.

[0078] In this embodiment, the controller is fixed to the frame by a fixing device to ensure stability during movement and ensure that the user does not need to wear or fix the controller additionally. By using a mechanical gripper as the fixing device, the installation process becomes simpler and more convenient, without the need to manually adjust the position of components or use additional tools for fixing, and the design of the mechanical gripper also takes into account the convenience of disassembly.

[0079] Embodiment 5

[0080] This embodiment is specifically implemented on the electromagnetic damping automatic braking device for baby strollers proposed in Embodiments 1 to 4.

[0081] In this embodiment, when the baby stroller moves, the first wheel 2 rolls, driving the conductor to cut the magnetic induction line in the magnetic field generated by the magnet and generating an electric current. Let the intensity of the magnet at the first conductor be denoted as B (A / m), and the length of the first conductor be L (m). At this time, the calculation formula for the electric current generated per unit time is:

[0082] E = BLVsina

[0083] Where, a is the angle between the magnetic field direction and the cutting direction, and sina is approximately 0.4 - 0.6.

[0084] The electric current generated by the first conductor flows into the speed measurement module; the diode in the speed measurement module is a diode with a conduction voltage of 2V and is connected in series with a resistor with a resistance value of 900 ohms. The diode with a conduction voltage of 2V can be equivalent to a resistor of 600 ohms. When E is greater than 5V, that is, when 12 < BL < 17.9 at this time, the diode is turned on, and the voltage output to the braking module is approximately 3.4V at this time, and the braking module starts to work.

[0085] In the braking module, the input current is amplified by a triode with an amplification factor of 5 - 10 times. The current amplified by the triode is output to the solenoid, so that the solenoid wound unevenly on the fixed frame 8 can generate a magnetic field with uneven intensity in the space where the second wheel 3 is located. Denote the uneven magnetic field intensity generated at a distance of 0.2 mm from the solenoid as B2. At this time, the magnitude of the eddy current damping force generated per unit length of the second conductor is KB2IV, where I is the conductor length and K is a proportionality constant; the rolling of the tire is hindered by the generated eddy current damping force to achieve automatic braking.

[0086] The same or similar reference numerals correspond to the same or similar components;

[0087] The terms used to describe the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent;

[0088] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An electromagnetic damping automatic brake device for a baby carriage, comprising a frame (1), wherein the frame (1) is connected to a first wheel (2) and a second wheel (3), and characterized in that: A magnet (4) is provided on the vehicle frame (1) and around the first wheel (2); a first conductor (5) capable of cutting the magnetic field generated by the magnet (4) is provided on the hub of the first wheel (2); the first conductor (5) is connected to an input end of a controller (6) via a wire; The vehicle frame (1) is further provided with a fixed frame (8) at the connection between the second wheel (3) and the vehicle frame (1), a solenoid (801) is unevenly wound on the fixed frame (8), and the solenoid (801) is electrically connected to the output end of the controller (6) to generate an uneven magnetic field; The hub (301) of the second wheel (3) is provided with a second conductor (7) capable of relative movement with the non-uniform magnetic field.

2. The electromagnetic damping automatic brake device for a baby carriage according to claim 1, characterized in that: The magnet (4) is a U-shaped magnet, and the opening of the U-shaped magnet is arranged toward the first wheel (2).

3. The electromagnetic damping automatic brake device for a baby carriage according to claim 1, characterized in that: The vehicle frame (1) is provided with a connecting rod (101), the wheel hub (301) of the second wheel (3) is connected to the bearing (102) on the connecting rod (101), the fixed frame (8) is fixedly connected to the connecting rod (101), and the wheel hub (301) of the second wheel is located on the periphery of the fixed frame (8).

4. The electromagnetic damping automatic brake device for a baby carriage according to claim 1, characterized in that: The controller (6) includes a speed measuring module and a brake module, wherein the input end of the speed measuring module is connected to the first conductor (5), the output end of the speed measuring module is connected to the input end of the brake module, and the output end of the brake module is connected to the second conductor (7).

5. The electromagnetic damping automatic brake device for a baby carriage according to claim 4, characterized in that: A diode is provided inside the speed measurement module, the input end of the diode is connected to the first conductor (5), and the output end of the diode is connected to the brake module.

6. The electromagnetic damping automatic brake device for a baby carriage according to claim 4, characterized in that: The controller is further provided with a pressure detection module, the pressure detection module comprising a pressure sensing device (9) and a discriminator, the pressure sensing device (9) being provided on the handle of the vehicle frame (1); the output end of the pressure detection module and the output end of the speed measurement module being respectively connected to the input end of the discriminator, and the output end of the discriminator being connected to the brake module.

7. The electromagnetic damping automatic brake device for a baby carriage according to claim 5, characterized in that: The speed measurement module is further provided with a knob resistor, one end of which is connected to the input end of the diode, and the other end of which is connected to the first conductor (5).

8. The electromagnetic damping automatic brake device for a baby carriage according to claim 5, characterized in that: The brake module is provided with a transistor, the base of the transistor is connected to the output end of the speed measurement module, the collector of the transistor is connected to the amplifying power supply, and the emitter of the transistor is connected to the second conductor (7).

9. The electromagnetic damping automatic brake device for a baby carriage according to claim 6, characterized in that: The pressure sensing device (9) comprises a force-sensitive resistor.

10. The electromagnetic damping automatic brake device for a baby carriage according to any one of claims 1 to 9, characterized in that: The controller (6) is fixed on the vehicle frame (1) via a fixing device (601).

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