Wheelchair folding control circuit

Abstract

The utility model discloses a wheelchair folding control circuit. The device comprises a control circuit board used for controlling folding of the wheelchair, and is characterized by further comprising a pressure sensor installed in a seat cushion of the wheelchair, and the pressure sensor is connected to the control circuit board through a voltage follower and can provide pressure signals for the control circuit board. The control circuit board is connected with a push rod motor control circuit used for driving the push rod motor to act and further provided with a switch button used for inputting control signals to the control circuit board. And when receiving a control signal of the switch button, the control circuit board can judge according to a pressure signal of the pressure sensor to enable the push rod motor control circuit to work and further output a corresponding signal to the push rod motor. The electric wheelchair has the advantages that the folding of the electric wheelchair can be realized, and the folding operation cannot be finished even if the button switch is triggered under the condition that the electric wheelchair is not triggered, so that the safety of a user is effectively ensured, and potential safety hazards are eliminated.

Description

Technical Field

[0001] The utility model relates to an electric wheelchair, in particular to a folding control circuit for a wheelchair. Background Art

[0002] As a medical care product, electric wheelchairs are widely used. For foldable electric wheelchairs, at present in the market, some electric wheelchairs have an electric folding function. The folding method of this kind of wheelchair is to directly control the folding of the electric wheelchair through a button, which only realizes the functions of folding and unfolding, but cannot guarantee the safety performance. For example, when the user accidentally presses the folding button or a single fault occurs in the system, and at this time the person is still sitting on the wheelchair, this will pose a potential risk to the user and there will be a great potential safety hazard problem. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a folding control circuit for a wheelchair that can not only realize automatic folding but also ensure the safety of the user.

[0004] To solve the above technical problem, the folding control circuit for a wheelchair of the utility model includes a control circuit board for controlling the folding of the wheelchair, and is characterized in that: it further includes a pressure sensor installed in the seat cushion of the wheelchair. The pressure sensor is connected to the control circuit board through a voltage follower and can provide a pressure signal to the control circuit board. The control circuit board is connected with a push rod motor control circuit for driving the push rod motor to act. A switch button for inputting a control signal to the control circuit board is also arranged on the control circuit board. When the control circuit board receives the control signal of the switch button, it can combine the pressure signal of the pressure sensor to judge to make the push rod motor control circuit work and then output a corresponding signal to the push rod motor.

[0005] The switch button includes a folding control button K1 and an unfolding control button K2.

[0006] The push rod motor control circuit includes a forward rotation control circuit for folding the wheelchair and a reverse rotation control circuit for unfolding the wheelchair.

[0007] The forward rotation control circuit includes a resistor R2, a triode Q4, a triode Q1, a triode Q2, a triode Q3, and a resistor R4 connected to the control circuit board. The resistor R2 is connected to the base of the triode Q4. The collector of the triode Q4 is respectively connected to the bases of the triode Q1 and the triode Q3. The collector of the triode Q4 is also connected to the control circuit board through the resistor R4. The collectors of the triode Q1 and the triode Q2 are directly connected to the control circuit board. The emitter of the triode Q1 is connected to the base of the triode Q2. The emitter of the triode Q2 is connected to the emitter of the triode Q3. The collectors of the triode Q3 and the emitter of the triode Q4 are both grounded.

[0008] The reverse rotation control circuit includes a resistor R3, a triode Q8, a triode Q5, a triode Q6, a triode Q7, and a resistor R5 connected to the control circuit board. The resistor R3 is connected to the base of the triode Q8. The collector of the triode Q8 is respectively connected to the bases of the triode Q5 and the triode Q7. The collector of the triode Q4 is also connected to the control circuit board through the resistor R5. The collectors of the triode Q5 and the triode Q6 are directly connected to the control circuit board. The emitter of the triode Q5 is connected to the base of the triode Q6. The emitter of the triode Q6 is connected to the emitter of the triode Q7. The emitters of the triode Q7 and the triode Q8 are both grounded.

[0009] One end of the push rod motor is connected between the triode Q2 and the triode Q3, and the other end of the push rod motor is connected between the triode Q6 and the triode Q7.

[0010] The triode Q4, the triode Q1, the triode Q2, the triode Q8, the triode Q5, and the triode Q6 are all NPN type triodes, and the triode Q3 and the triode Q7 are both PNP type triodes.

[0011] The advantages of the present invention are as follows:

[0012] By connecting a pressure sensor to the control circuit and designing the circuit structure, it is possible to monitor whether there is a user or corresponding items on the wheelchair through the pressure sensor. If the system detects pressure, the wheelchair cannot be folded; on the contrary, if the system does not detect pressure from the pressure sensor, the folding operation can be successfully completed. Thus, not only can the electric wheelchair be folded, but also when not triggered, even if the button switch is triggered, the folding operation cannot be completed, effectively ensuring the safety of the user and eliminating potential safety hazards. Description of the Drawings

[0013] Figure 1 It is a circuit diagram of the folding control circuit of the wheelchair of the present invention. Detailed implementation mode

[0014] The following further elaborates on the folding control circuit of the wheelchair of the present utility model in conjunction with the accompanying drawings and specific implementation modes.

[0015] As shown in the figure, the folding control circuit of the wheelchair of the present utility model includes a control circuit board for controlling the folding of the wheelchair, and also includes a pressure sensor installed in the seat cushion of the wheelchair. The pressure sensor is connected to the control circuit board through a voltage follower and can provide a pressure signal to the control circuit board. During installation, the pressure sensor is fixed inside the seat cushion, so as to accurately detect the weight of the rider; the pressure sensor is connected to the control circuit board through a voltage follower; and the controller of the control circuit board is installed on the frame; the control circuit board is connected with a push rod motor control circuit for driving the push rod motor to act. There are also two switch buttons for inputting control signals to the control circuit board on the control circuit board. One of the switch buttons is the folding control button K1, and the other switch button is the unfolding control button K2. The push rod motor control circuit includes a forward rotation control circuit for folding the wheelchair and a reverse rotation control circuit for unfolding the wheelchair. When the control circuit board receives the control signal of the switch button (that is, one of the folding control button K1 or the unfolding control button K2), it can combine the pressure signal of the pressure sensor to judge and make the push rod motor control circuit work, and then output a corresponding signal to the push rod motor, so that the push rod motor performs a folding or unfolding action.

[0016] Further, for a specific control circuit, the forward rotation control circuit includes a resistor R2, a triode Q4, a triode Q1, a triode Q2, a triode Q3, and a resistor R4 connected to a control circuit board. The resistor R2 is connected to the base of the triode Q4. The collector of the triode Q4 is respectively connected to the bases of the triode Q1 and the triode Q3. The collector of the triode Q4 is also connected to the control circuit board through the resistor R4. The collectors of the triode Q1 and the triode Q2 are directly connected to the control circuit board. The emitter of the triode Q1 is connected to the base of the triode Q2. The emitter of the triode Q2 is connected to the emitter of the triode Q3. The collectors of the triode Q3 and the emitter of the triode Q4 are both grounded. The reverse rotation control circuit includes a resistor R3, a triode Q8, a triode Q5, a triode Q6, a triode Q7, and a resistor R5 connected to the control circuit board. The resistor R3 is connected to the base of the triode Q8. The collector of the triode Q8 is respectively connected to the bases of the triode Q5 and the triode Q7. The collector of the triode Q4 is also connected to the control circuit board through the resistor R5. The collectors of the triode Q5 and the triode Q6 are directly connected to the control circuit board. The emitter of the triode Q5 is connected to the base of the triode Q6. The emitter of the triode Q6 is connected to the emitter of the triode Q7. The emitters of the triode Q7 and the triode Q8 are both grounded. One end of the push rod motor is connected between the triode Q2 and the triode Q3, and the other end of the push rod motor is connected between the triode Q6 and the triode Q7. The triode Q4, the triode Q1, the triode Q2, the triode Q8, the triode Q5, and the triode Q6 are all NPN-type triodes, and the triode Q3 and the triode Q7 are both PNP-type triodes.

[0017] Its working principle is as follows:

[0018] When the user rides in the wheelchair, the pressure sensor can be triggered. After the pressure sensor acts, it will amplify the pressure signal through a voltage follower and then send it to the control circuit board. When there is an output voltage signal at the resistor R2 terminal, the triode Q4 conducts. At this time, the triode Q1 and the triode Q2 cannot conduct. Then the voltage on the right side of the push rod motor is 24 volts, driving the push rod motor to rotate forward. When there is an output voltage signal at the resistor R3 terminal, the triode Q8 conducts. At this time, the triode Q5 and the triode Q6 cannot conduct. Then the voltage on the right side of the push rod motor is 24 volts, driving the push rod motor to rotate in reverse. That is, if the closing signals are received at the same time and both signals meet the conditions, a straight-line closing instruction is issued.

[0019] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. A folding control circuit for a wheelchair, comprising a control circuit board for controlling the folding of the wheelchair, characterized in that: It further includes a pressure sensor installed in the seat cushion of the wheelchair. The pressure sensor is connected to the control circuit board through a voltage follower and can provide a pressure signal to the control circuit board. The control circuit board is connected with a push rod motor control circuit for driving the push rod motor to act. A switch button for inputting a control signal to the control circuit board is also arranged on the control circuit board. When the control circuit board receives the control signal of the switch button, it can judge by combining the pressure signal of the pressure sensor to make the push rod motor control circuit work and then output a corresponding signal to the push rod motor.

2. The folding control circuit of the wheelchair according to claim 1, characterized in that: The switch button includes a folding control button K1 and an unfolding control button K2.

3. The folding control circuit of the wheelchair according to claim 1 or 2, characterized in that: The push rod motor control circuit includes a forward rotation control circuit for folding the wheelchair and a reverse rotation control circuit for unfolding the wheelchair.

4. The folding control circuit of the wheelchair according to claim 3, wherein: The forward rotation control circuit includes a resistor R2, a triode Q4, a triode Q1, a triode Q2, a triode Q3 and a resistor R4 connected to the control circuit board. The resistor R2 is connected to the base of the triode Q4. The collector of the triode Q4 is respectively connected to the bases of the triodes Q1 and Q3. The collector of the triode Q4 is also connected to the control circuit board through the resistor R4. The collectors of the triodes Q1 and Q2 are directly connected to the control circuit board. The emitter of the triode Q1 is connected to the base of the triode Q2. The emitter of the triode Q2 is connected to the emitter of the triode Q3. The collectors of the triodes Q3 and Q4 are grounded.

5. The folding control circuit of the wheelchair according to claim 4, wherein: The reverse rotation control circuit includes a resistor R3, a triode Q8, a triode Q5, a triode Q6, a triode Q7 and a resistor R5 connected to the control circuit board. The resistor R3 is connected to the base of the triode Q8. The collector of the triode Q8 is respectively connected to the bases of the triodes Q5 and Q7. The collector of the triode Q4 is also connected to the control circuit board through the resistor R5. The collectors of the triodes Q5 and Q6 are directly connected to the control circuit board. The emitter of the triode Q5 is connected to the base of the triode Q6. The emitter of the triode Q6 is connected to the emitter of the triode Q7. The emitters of the triodes Q7 and Q8 are grounded.

6. The folding control circuit of the wheelchair according to claim 5, characterized in that: One end of the push rod motor is connected between the triodes Q2 and Q3, and the other end of the push rod motor is connected between the triodes Q6 and Q7.

7. The folding control circuit of the wheelchair according to claim 6, wherein: The triodes Q4, Q1, Q2 and the triodes Q8, Q5, Q6 are all NPN-type triodes, and the triodes Q3 and Q7 are both PNP-type triodes.

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