Power-assisted positioning device for cab side door and control method of power-assisted positioning device

Abstract

The invention discloses a cab side door power-assisted positioning device which comprises an adjustable resistor, an electromagnet, a permanent magnet, buffer rubber, a cab side door, a door closing reminder, a door closing control relay, a limiting switch, a vehicle control unit, a pilot valve, a safety handle switch, a return switch, a power source and an instrument. Assistance is provided for the driver to close the door, and the operation convenience is improved when the driver closes the door; meanwhile, through the intelligent integrated design, the opening and closing state of the cab side door is associated with whether the working device is started or not, the operation safety of a driver is improved, and the intelligent design of the cab side door is of great significance.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a driver's cab side door power-assisted positioning device and a control method thereof. Background Art

[0002] The cab side door power-assist positioning device and its control method belong to the cab system and are installed on the cab side door, frame and its vicinity. Their function is to position the cab side door when opening it and to assist it when closing it. Moreover, their control method can prevent the pilot valve from working when the cab side door is not closed, thus ensuring the safety of the driver.

[0003] The traditional technology uses a positioning lock installed on the side of the cab frame. When the driver in the cab needs to close the door, he opens the positioning lock handle, but the cab side door has no power and still maintains a 180° angle with the frame, which cannot form a certain force angle, making it difficult and laborious for the driver to close the door. In addition, whether the pilot valve of the traditional technology is open or not has nothing to do with the switch status of the cab side door. When the cab side door is open, the working device can still work, which poses certain safety hazards.

[0004] At present, the common cab side door positioning mechanism is composed of a mechanical positioning lock and a handle switch. The mechanical positioning lock is composed of a lock tongue and a lock bump. The lock tongue is installed on the cab side door, the lock bump is installed on the side of the cab frame, and the handle switch is installed in the cab. When opening the door, the driver pushes the side door to the fully open position. At this time, the lock tongue of the mechanical positioning lock is embedded in the lock bump and is completely locked; when closing the door, the driver needs to pull the handle switch. At this time, the lock tongue and lock bump of the mechanical positioning lock are separated, but the side door is still in the fully open position. It is more difficult for the driver to close the door in the cab. The disadvantages are: first, when the driver in the cab needs to close the door, open the positioning lock handle, the cab side door has no power assistance, and still maintains a 180° angle with the frame, and cannot form a certain force angle, which makes it difficult and laborious for the driver to close the door.

[0005] In addition, whether the pilot valve of traditional technology is open or not has no correlation with the switch status of the cab side door. When the cab side door is open, the working device can still work, which poses certain safety hazards. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, in order to solve the problem that the driver has difficulty in closing the door, the present invention provides a driver's cab side door power-assisted positioning device and a control method thereof, which combines a permanent magnet and an electromagnet. When the power is on, the two magnets repel each other, which assists in closing the door. When the power is off, the permanent magnet and the electromagnet core attract each other, which plays a positioning role on the side door. At the same time, the switch state of the side door is associated with the working device, thereby improving the driver's operating safety. Specifically, when the driver inside the cab opens the side door, the cab side door is positioned in a fully open position; when closing the side door, power is provided to the side door, and a mechanism is formed so that the side door and the frame form an angle less than 180°, which is convenient for the driver to close the door; when the cab side door is not closed, the pilot valve can be prevented from working, thereby improving operational safety.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a cab side door power-assisted positioning device, comprising: an adjustable resistor, an electromagnet, a permanent magnet, a buffer rubber, a cab side door, a door closing reminder, a door closing control relay, a limit switch, a vehicle controller, a pilot valve, a safety handle switch, a return switch, a power supply, and an instrument. The switch interfaces of the power supply, the adjustable resistor, the electromagnet, the door closing reminder, and the door closing control relay are connected together through wires to form a loop; The vehicle controller is connected with the limit switch, the pilot valve, the safety handle switch, the instrument, and the coil of the door closing control relay.

[0008] Furthermore, the limit switch and the permanent magnet are arranged on the cab side door, and the electromagnet is installed on the cab frame. When the cab side door is fully opened, the permanent magnet and the electromagnet are arranged opposite to each other.

[0009] Furthermore, it also includes a return switch, which is arranged in a loop composed of a power supply, an adjustable resistor, an electromagnet, a door closing reminder, and a switch interface of a door closing control relay. The return switch is connected in parallel with the switch interface of the door closing reminder and the door closing control relay in the loop.

[0010] Furthermore, a buffer rubber is provided on the permanent magnet.

[0011] A control method for a cab side door power-assisted positioning device, comprising the following method: When the cab side door is opened, when the cab side door is pushed open to the fully open position, the permanent magnet installed on it will touch the electromagnet installed on the cab frame. Since the electromagnet is not charged at this time, the permanent magnet can be attracted to the iron core of the electromagnet; When closing the cab side door, just press the return switch installed in the cab. At this time, the electromagnet is energized and the direction of the magnetic pole is the same as that of the permanent magnet. According to the principle of like poles repel, the cab side door is automatically popped open, allowing the driver to easily close the door in the cab.

[0012] Furthermore, the fully open position of the cab side door is when the cab side door is opened to 180°.

[0013] Furthermore, the cab side door is automatically opened to 80-120 degrees.

[0014] Furthermore, when the cab side door is open, if the driver opens the safety handle switch in violation of regulations, the vehicle controller does not receive the door closing state signal from the limit switch. On the one hand, it will not control the pilot valve to open, and on the other hand, it will control the door closing control relay to close. At this time, the door closing reminder alarms to remind the driver to close the door; the instrument will also remind the driver to close the door; the electromagnet is energized, and the cab side door pops open; when the driver closes the side door, the door closing relay is disconnected and the alarm is lifted; at the same time, the pilot valve starts to work; When the cab side door is closed, if the driver turns on the safety handle switch, the vehicle controller receives the door closing status signal from the limit switch. On the one hand, it will control the pilot valve to open, and on the other hand, it will not control the door closing control relay to close. The door closing reminder will not alarm, and the instrument will not remind you to close the door.

[0015] Furthermore, the repulsive force between the electromagnet and the permanent magnet is controlled by adjusting the adjustable resistor or the gap between the two; the suction force between the permanent magnet and the iron core of the electromagnet can be adjusted by replacing the material or volume of the permanent magnet, or changing the gap between the two; under special working conditions, if it is necessary to open the cab side door for operation, the cab side door associated pilot valve function can be released through the instrument.

[0016] The beneficial effects of the present invention are: it provides assistance to the driver when closing the door at a relatively low cost, thereby improving the convenience of operation for the driver when closing the door; at the same time, through the intelligent integrated design, the opening and closing state of the cab side door is associated with whether the working device is turned on, thereby improving the driver's operational safety, which is of great significance to the intelligent design of the cab side door. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the circuit structure of the present invention; Figure 2 It is a schematic diagram of the process of the present invention; Figure 3 It is a schematic diagram of the installation structure of some components of the present invention; Figure 4 Schematic diagram of magnetic field distribution and structure; In the figure: 1. Adjustable resistor; 2. Electromagnet; 3. Permanent magnet; 4. Buffer rubber; 5. Cab side door; 6. Door closing reminder; 7. Door closing control relay; 8. Limit switch; 9. Vehicle controller; 10. Pilot valve; 11. Safety handle switch; 12. Return switch; 13. Power supply; 14. Instrument. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] like Figure 1 As shown, a cab side door power-assisted positioning device comprises: an adjustable resistor 1, an electromagnet 2, a permanent magnet 3, a buffer rubber 4, a cab side door 5, a door closing reminder 6, a door closing control relay 7, a limit switch 8, a vehicle controller 9, a pilot valve 10, a safety handle switch 11, a return switch 12, a power supply 13, and a meter 14. The switch interfaces of the power supply 13, the adjustable resistor 1, the electromagnet 2, the door closing reminder 6, and the door closing control relay 7 are connected together through wires to form a loop; The vehicle controller 9 is connected to the limit switch 8 , the pilot valve 10 , the safety handle switch 11 , the instrument 14 , and the coil of the door closing control relay 7 .

[0021] like Figure 3 As shown, the limit switch 8 and the permanent magnet 3 are arranged on the cab side door 5, and the electromagnet 2 is installed on the cab frame. When the cab side door 5 is fully opened, the permanent magnet 3 and the electromagnet 2 are arranged opposite to each other.

[0022] A power-assisted positioning device for a cab side door 5 also includes a return switch 12, which is arranged inside the cab. The return switch 12 is arranged in a loop composed of a power supply 13, an adjustable resistor 1, an electromagnet 2, a door closing reminder 6, and a switch interface of a door closing control relay 7. The return switch 12 is connected in parallel with the switch interface of the door closing reminder 6 and the door closing control relay 7 in the loop.

[0023] Furthermore, a buffer rubber 4 is provided on the permanent magnet 3 .

[0024] like Figure 2 As shown, a control method of the power-assisted positioning device of the cab side door 5 includes the following methods: When the cab side door 5 is opened, when the cab side door 5 is pushed open to the fully opened position, the permanent magnet 3 installed thereon will hit the electromagnet 2 installed on the cab frame. Since the electromagnet 2 is not charged at this time, the permanent magnet 3 can be attracted to the iron core of the electromagnet 2. When closing the cab side door 5, just press the return switch 12 installed in the cab. At this time, the electromagnet 2 is energized, and the magnetic pole direction is the same as that of the permanent magnet 3. According to the principle of like poles repelling, the cab side door 5 is automatically opened, so that the driver can easily close the door in the cab.

[0025] The fully open position of the cab side door 5 is when the cab side door 5 is opened to 180°, and the cab side door 5 is automatically opened to 80-120°.

[0026] When the cab side door 5 is open, if the driver opens the safety handle switch 11 in violation of regulations, the vehicle controller 9 does not receive the door closing state signal from the limit switch 8. On the one hand, it will not control the pilot valve 10 to open, and on the other hand, it will control the door closing control relay 7 to be attracted. At this time, the door closing reminder 6 alarms to remind the driver to close the door; the instrument 14 also reminds the driver to close the door; the electromagnet 2 is energized, and the cab side door 5 pops open; when the driver closes the side door, the door closing relay is disconnected and the alarm is released; at the same time, the pilot valve 10 starts to work; When the cab side door 5 is closed, if the driver turns on the safety handle switch 11, the vehicle controller 9 receives the door closing state signal from the limit switch 8. On the one hand, it will control the pilot valve 10 to open, and on the other hand, it will not control the door closing control relay 7 to be energized, the door closing reminder 6 will not alarm, and the instrument 14 will not remind to close the door.

[0027] The magnitude of the repulsive force between the electromagnet 2 and the permanent magnet 3 is controlled by adjusting the adjustable resistor 1 or the gap between the two; the magnitude of the suction force between the permanent magnet 3 and the iron core of the electromagnet 2 can be adjusted by replacing the material or volume of the permanent magnet 3, or changing the gap between the two; under special working conditions, if it is necessary to open the cab side door 5 for operation, the function of the pilot valve 10 associated with the cab side door 5 can be released through the instrument 14.

[0028] Calculation of magnet repulsion and attraction: When the electromagnet 2 is energized, it generates magnetism and repel the permanent magnet 3. When performing repulsive force analysis, the force model between the electromagnet 2 and the permanent magnet 3 can be equivalent to the force model between the permanent magnet 3 and the permanent magnet 3, such as Figure 4 As shown, the equivalent magnetic field (a) and the structural diagram (b) show the repulsive force between the two cylindrical magnets: F Z = 2 L1R2 2 L2 (1) Where: F Z is the axial force between the two magnets, N; μ0 is the magnetic permeability of vacuum, N / A 2;M is the magnetization intensity of the magnet, A / mm; R1 and R2 are the radii of the two cylindrical magnets, mm; L1 and L2 are the lengths of the two cylindrical magnets, mm; x is the distance between the two magnets, mm. Vacuum magnetic permeability μ0=4π×10 -7 N / A 2 The magnetization intensity can be calculated according to the magnetic susceptibility χ of the permanent magnet 3. m and residual magnetic intensity B r The calculation formula is: M= (2) The selected permanent magnet 3 is a neodymium iron boron magnet, which produces a residual magnetic intensity Br = 1.16T. The magnetization intensity of the permanent magnet 3 is much greater than 1. Substituting the data into formula (2) we can get M = 0.092 × 10 7 A / m.

[0029] As shown in Figure 1, R1=r1, R2=r2, L1=h1, L2=h2, x=d. Set r1=8 mm, h1=30 mm, r2=10 mm, h2=30 mm, d=5 mm. Substitute the data into equation (1) to obtain Fz=421.2 N.

[0030] The attraction between the permanent magnet 3 and the core of the electromagnet 2 is: F a = (3) In the formula, F a Indicates the magnetic attraction, B r represents the magnetic field strength of the magnet, A represents the surface area of ​​the magnet, represents the vacuum magnetic permeability, and d represents the distance between the magnet and the object. From the above, we can see that A=2πr2 2 +2πr2h2, r2=10 mm, h2=30 mm, Br= 1.16T, μ0=4π×10 -7 N / A 2 , d=5, substitute the data into formula (3) to obtain F a =53.8N.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cab side door power-assisted positioning device, characterized in that: include: The adjustable resistor (1), the electromagnet (2), the permanent magnet (3), the buffer rubber (4), the cab side door (5), the door closing reminder (6), the door closing control relay (7), the limit switch (8), the vehicle controller (9), the pilot valve (10), the safety handle switch (11), the return switch (12), the power supply (13), and the instrument (14). The switch interfaces of the power supply (13), the adjustable resistor (1), the electromagnet (2), the door closing reminder (6), and the door closing control relay (7) are connected together through wires to form a circuit. The vehicle controller (9) is connected to the limit switch (8), the pilot valve (10), the safety handle switch (11), the instrument (14), and the coil of the door closing control relay (7).

2. The driver's cab side door power-assisted positioning device according to claim 1, characterized in that: The limit switch (8) and the permanent magnet (3) are arranged on the cab side door (5), and the electromagnet (2) is installed on the cab frame. When the cab side door (5) is fully opened, the permanent magnet (3) and the electromagnet (2) are arranged opposite to each other.

3. The driver's cab side door power-assisted positioning device according to claim 2, characterized in that: The invention also comprises a return switch (12), wherein the return switch (12) is arranged in a circuit composed of a power supply (13), an adjustable resistor (1), an electromagnet (2), a door closing reminder (6), and a switch interface of a door closing control relay (7), and the return switch (12) is connected in parallel with the switch interfaces of the door closing reminder (6) and the door closing control relay (7) in the circuit.

4. The driver's cab side door power-assisted positioning device according to claim 1, characterized in that: A buffer rubber is provided on the permanent magnet (3).

5. The control method of the cab side door power-assisted positioning device according to claim 3, characterized in that: The following methods are included: When the cab side door (5) is opened, when the cab side door (5) is pushed open to the fully opened position, the permanent magnet (3) mounted thereon will contact the electromagnet (2) mounted on the cab frame. Since the electromagnet (2) is not charged at this time, the permanent magnet (3) can be attracted to the iron core of the electromagnet (2); When closing the cab side door (5), it is only necessary to press the return switch (12) installed in the cab. At this time, the electromagnet (2) is energized, and the magnetic pole direction is the same as that of the permanent magnet (3). According to the principle of like poles repelling each other, the cab side door (5) is automatically opened, so that the driver can easily close the door in the cab.

6. A control method for a cab side door power-assisted positioning device according to claim 5, characterized in that: The fully open position of the cab side door (5) is when the cab side door (5) is opened to 180°.

7. The control method of the cab side door power-assisted positioning device according to claim 5, characterized in that: The cab side door (5) is automatically opened to 80-120 degrees.

8. The control method of the cab side door power-assisted positioning device according to claim 5, characterized in that: When the cab side door (5) is open, if the driver opens the safety handle switch (11) in violation of regulations, the vehicle controller (9) does not receive the door closing state signal from the limit switch (8), and on the one hand, it will not control the pilot valve (10) to open, and on the other hand, it will control the door closing control relay (7) to be attracted. At this time, the door closing reminder (6) will alarm to remind the driver to close the door; the instrument will also remind the driver to close the door; the electromagnet (2) will be energized, and the cab side door (5) will pop open; when the driver closes the side door, the door closing relay will be disconnected and the alarm will be released; at the same time, the pilot valve will start to work; When the cab side door (5) is closed, if the driver turns on the safety handle switch (11), the vehicle controller (9) receives the door closing state signal from the limit switch (8), and on the one hand, controls the pilot valve (10) to open, and on the other hand, does not control the door closing control relay (7) to close, so that the door closing reminder does not sound an alarm, and the instrument does not remind the user to close the door.

9. The control method of the cab side door power-assisted positioning device according to claim 8, characterized in that: The magnitude of the repulsive force between the electromagnet (2) and the permanent magnet (3) is controlled by adjusting the adjustable resistor (1) or the gap between the two. The magnitude of the attractive force between the permanent magnet (3) and the iron core of the electromagnet (2) can be adjusted by replacing the material or volume of the permanent magnet (3) or changing the gap between the two. Under special working conditions, if it is necessary to open the cab side door for operation, the cab side door associated pilot valve function can be released through the instrument.

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