JPH03260268A - Motor controlling circuit for two-storied parking equipment - Google Patents

Abstract

PURPOSE:To simplify a circuit by connecting a first electrical contact and a second electrical contact respectively to the control circuit in series, and by using the intermittent time of the first electrical contact and the second electrical contact, to delay the reverse rotation of a motor. CONSTITUTION:When a pallet 2 is moved upward, then a stop switch ST is pushed and the pallet is stopped and immediately after that, when a descending switch DW is pushed and the pallet is moved down, then a motor M is reversely rotated. After that, a stopper 32 starts moving rotationally from a dropping- proof position A and a limit switch LSZ1(a first electrical contact) is turned OFF and after that, the stopper 32 approaches a pallet descending position B. Then, t1 hours are needed till a limit switch LSZ2(a second electrical contact) is turned ON, and so counter-electromotive current to be generated at the time of the reverse rotation of the motor M is prevented from being generated. As a result, by composing a control circuit mechanically, it can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motor control circuit for preventing troubles caused by back electromotive force generated when a motor for raising and lowering a pallet rotates in reverse in a two-stage parking device.

(Prior art) Conventionally, in a two-tier parking device, a pallet is supported so that it can be raised and lowered along pillars erected on the floor, and the pallet is moved up and down by the rotation of a motor in the forward and reverse directions. It is composed of Then, a lift switch and a drop switch provided on the operation panel rotate the motor in forward and reverse directions to raise the pallet, and a stop switch stops the rotation of the motor to stop the pallet from moving up and down.

Here, when lifting or lowering the pallet, the rotational direction of the motor may be reversed if necessary, such as by incorrect operation of each switch or inspection. In such a case, a back electromotive force is generated in the motor, causing an excessive current to flow in the motor control circuit.
To prevent damage to the motor and circuitry, the motor control circuit is usually equipped with a timer and configured to rotate the motor in reverse after a certain period of time to prevent problems caused by back electromotive force that occurs when the motor rotates in reverse. Ta.

(Problems to be Solved by the Invention) However, in the conventional motor control circuit equipped with a timer, the timer is expensive, and safety measures may be required in the event of timer failure. There was a problem that the circuit was complicated and expensive. This has been an obstacle to the widespread use of two-stage parking systems, especially for private residences.

(Means for Solving the Problems) In the motor control circuit of the two-stage parking device of the present invention, columns are erected on both sides of the pallet, and the pallet is raised and lowered along the columns by rotational drive of the motor in forward and reverse directions. In the freely configured two-stage parking device, at least one stopper is provided at a suitable position in the vertical direction of the support, and the stopper protrudes from the support and locks with a locking member fixed to the pallet. The pallet is provided so as to be rotatable and interlocked with each other so as to take a fall prevention position where the pallet is prevented from falling by doing so, and a lowering position where the pallet is sunk into the support column and is not locked with the locking member. The control circuit for rotating the motor in the pallet upward direction is connected in series with a first electrical contact that becomes connected when it detects that the stopper is in the drop prevention position, and also connects in series to the control circuit for rotating the motor in the pallet downward direction. A second electrical contact that becomes "connected" when it detects that the stopper is in the lowered pallet position is connected in series to the control circuit for rotating the pallet, and a time period for the first electrical contact and the second electrical contact to be connected and disconnected is connected in series. It is configured to utilize this to delay the reverse rotation of the motor.

(Function) For example, when the stopper rotates from the fall prevention position to the pallet lowering position, the stopper starts rotating from the fall prevention position and the first! After the electrical contact becomes "broken", the time required for the second electrical contact to become "contact" when the S-/B approaches the pallet lowering position is used to create a delay circuit when the motor rotates in reverse. Configure.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 3 show a two-stage parking device according to the present invention. In this example, for convenience of explanation, the left and right in Figure 2 are referred to as "front and rear", and the left and right in Figure 3 are referred to as "front and rear".
They are called "left and right."

In the figure, reference numeral 1 denotes a support column that supports the pallet 2 in a vertically movable manner, and a total of four columns 1 are installed on the front, rear, left, and right sides of the pallet 2 near the rear.

These struts l... have a U-shaped cross section, and the left front and rear struts 1.1 and the right front and rear struts 1.1 are parallel to each other so that their respective openings 1a and Ia face each other. It is located in

The lower end portions 1b of each of the pillars 1 are fixed to bases 3, 3 disposed on both the left and right sides, and these bases 3, 3 are attached to the floor by fixing means such as anchor bolts (not shown). It is firmly fixed to plane G.

The pallet 2 is used to place the vehicle C on its upper surface, and is formed in a pattern in which the upper surface of the front end is inclined downward toward the front end, so that the vehicle C can be taken in and out smoothly.

Sliders 5.5 are fixed to the left and right sides of the pallet 2, respectively, so as to be placed between the front and rear columns 1, 1 erected on the left and right sides. Guide rollers 6a, 6b are provided at the front and rear of each slider 5, 5, and the guide rollers 6a, 6b roll along the front and rear pillars 1, 1.
This allows the pallet 2 to be smoothly moved up and down.

Reference numeral 4 denotes a stopper provided at the rear end of the upper surface of the pallet 2, and the rear wheels of the vehicle C come into contact with this stopper 4, thereby preventing the vehicle C from moving backward during parking.

Further, a motor M is provided on the construction member 10 installed between the right columns 1.1, and a sprocket 12 is integrally provided on the output shaft of the motor M. On the other hand, an operating member 20 is provided on the construction member 15 that is constructed between the columns 1 and 1 on the left side. One end 13a of the drive chain 13 is fixed to this operating member 20, and
The other ends 13b of the drive chain 13 are pulleys 16a, 16b, l6 provided on both left and right sides of the pallet 2.
After being wound around the above-mentioned Subrokef 12 via c, it is hung down. As a result, the pallet 2 is raised and lowered by letting out the drive chain 13 to the pallet 2 side or pulling it out from the pallet 2 side by the rotation of the motor M, and by this raising and lowering operation, the pallet 2 assumes two upper and lower positions. . That is, when pallet 2 is at the lower limit position, vehicle C is allowed to enter pallet 2;
When the vehicle C is raised to the upper limit position, the vehicle C can be parked on the floor surface G below. Note that a linear member such as a wire or a lobe may be used instead of the drive chain 13 as long as it is safe in terms of strength.

As shown in FIG. 4, the actuating member 20 is configured such that a fastening member 21 that fastens one end 13a of the drive chain 13 is movable in the vertical direction by a guide rod 22° 22 via a moving member 25. At the same time, the guide rod 22,
The fixing member 2 is fixed by the springs 23 and 23 inserted in the
1 is always biased upward. And this fastening member 2
Since the driving chain 13 is pulled downward by the weight of the pallet 2, it is normally placed in the position shown in FIG. 4 against the urging force of the spring 23, and the pallet 2 is lowered to the lower limit position. When the drive chain 13 becomes loose or breaks, the spring 2
It moves upward due to the urging force of 3.

In the vicinity of the actuating member 20, there is a fastening member 21 as described above.
limit switch L that comes into contact with the moving member 25 and detects this when the pallet 2 moves upward, that is, when the pallet 2 reaches the lower limit position or when the drive chain 13 breaks.
SD is provided.

Further, at the upper end of the left front or right front pillar (in the illustrated example, right front pillar) 1, an abutting member is provided at the front upper end of the slider 5 when the pallet 2 reaches the uppermost position. A limit switch LSU that comes into contact with the pallet 26 to detect the upper limit position of the pallet 2 is provided.

Furthermore, a pallet fall prevention device 30 is disposed in the vertical direction in the opening 1a of the left rear column 1.

As shown in FIG. 5, the pallet fall prevention device 30 includes three stoppers 32 rotatably supported by pins 31 in the opening la of the left rear column 1, and these stoppers 32. The stoppers 32 are fixed to the front portions of the pins 31 via connecting members 33a, respectively.
a locking member 35 that protrudes from the rear side of the slider 5 and contacts the stopper 32 to prevent the pallet 2 from falling; and an upper end 33a of the wire 33.
are connected to each stopper 32... via a wire 33.
It is composed of a solenoid SQL for simultaneously rotating the

The stoppers 32... project forward from the opening 1a of the support 1 around the pin 31 and move to a fall prevention position A where the locking member 35 locks, and a fall prevention position A where the locking member 35 rotates toward the opening la side to lock the locking member. 3
The pallet is rotatably supported so as to take a lowered position fB in which the pallet 5 is not locked. In this example, these stoppers 32 are arranged at the upper part, middle part, and lower part of the support column 1. It is placed in a position where it will not cause serious damage even if it gets caught.

The wire 33 is a movable member 3 whose upper end 33a is slidable up and down by the excitation and demagnetization of the solenoid SOL.
7, and its lower end is fixed to one end of a spring 38. The other end of the spring 38 is fixed to the lower part of the column 1, so that the wire 33 is connected to the spring 3.
It is constantly pulled downward by the urging force of 8.

When the solenoid SQL is energized, it slides the movable member 37 upward, thereby rotating the stopper 32 via the wire 33 to the pallet lowering position B against the urging force of the spring 38.

Also, although not shown, a balance chain is stretched between the left and right supports 1 and 1 and between the pallet 2, and the pallet 2
It is configured to maintain the horizontal state of the pallet 2 when the pallet 2 is raised and lowered.

Furthermore, as shown in FIG. 5, in the vicinity of the solenoid SQL, there is a limit switch (no. Contact) LSZI and
A limit switch (211th contact point) LSZ2 is provided to detect that the stopper 32 is in the pallet lowered position.

These limit switches LSZ 1. and LSZ2 is
Normally it is set to "off" and the stopper 32 is at the fall prevention position 11A.
, and when the pallet lowering position B is reached, the contactor is activated and becomes "closed". These limit switches LSZ1. LSZ2 may be provided near the stopper 32.

FIG. 6 shows an electrical circuit diagram for controlling the motor M.

In Fig. 6, R1, R2, R3, Rx, and Ry are relays rial, rlaz, r2a, r3a, rx
a, , rxat, rxa,, r
Ya, .

r) laz, rya are normally “disconnected” relay contacts, ri
b is a normally "closed" relay contact. UP is an up switch, and DW is a down switch. When these up switch UP and down switch DW are kept pressed, they become "connected" and when released, they become "off." Further, SQL is the aforementioned solenoid, LSU and LSD are normally "closed" limit switches, and LSZI and LSZ2 are normally "disconnected" glue mint switches. ST is a stop switch, M is a motor, T
r is a transformer, B is a brake drive circuit, NFB is an earth leakage breaker, F is a fuse, and SK is a surge killer.

Next, the operation of the two-stage parking device configured as described above will be explained.

First, a case will be described in which the pallet 2 is raised from the lower limit position where the vehicle C can enter.

In this case, the stopper 32 is in the drop prevention position A, so the limit switch LSZ1 is in the "contact" state, and by pressing the rise switch UP, the relay R1 is energized and the relay contacts rla and rla2 are in the "contact" state. become self-maintained. Then, relay Rx is energized and relay contacts rXal, rXa! +rXa3 becomes "contact J", and the motor M rotates in the direction of raising the pallet. As a result, the drive chain 13 is pulled out from the pallet 2 side, and the guide rollers 5a and 5b of the sliders 5 and 5 are attached to the support columns 1... The pallet 2 moves upward while being guided by the support columns 1... When the pallet 2 rises to the upper limit position, the limit switch LSU comes into contact with the contact member 26 and is turned off. Relay R1 is de-energized and motor M
stops. Further, when the stop switch ST is pressed while the pallet 2 is being lifted, the lifting of the pallet 2 is similarly stopped.

When the pallet 2 is raised, the stopper 32 is in the fall prevention position A, so the pallet 2
from below, and passes through this stopper 32 while slightly rotating it toward the pallet lowering position fB. In other words, the pallet 2 passes through the stopper 32 while being pushed away from below.

Next, a case where the pallet 2 descends from the upper limit position will be described.

Next, a case where the pallet 2 descends from the uppermost position will be described.

If you keep pressing down switch DW, relay R3 becomes energized, relay contact r3a becomes "contact", and solenoid SQL
is excited. By energizing the solenoid SQL in this way, the stopper 37 slides upward, and the stopper 32 moves from the fall prevention position A to the pallet lowering position B through the wire 33 against the biasing force of the spring 38. Rotate. When the stopper 32 rotates to the pallet lowering position B, the limit switch LSZI is turned off, the limit switch LSZ2 is turned on, the relay R2 is energized, and the relay contact r2a is turned on.

As a result, relay Ry is energized and relay contact rYa+
, rVaz+ rYas becomes “contact J” and motor M
rotates in the opposite direction to the above-mentioned upward direction of the bullet. As a result, the drive chain 13 is fed out to the pallet 2 side, the guide rollers 6a, 6b of the sliders 5, 5 roll downward along the columns 1..., and the pallet 2 is moved toward the pallet 2.
Descend while being guided by... When the pallet 2 is lowered to the lower limit position, the drive chain 13 is loosened, and the fastening member 21 fixed to one end 13a of the drive chain 13 is moved upward by the spring 23.23. When the fastening member 21 moves upward, the moving member 25 comes into contact with the limit switch LSD, and this limit switch L
SD becomes "off", power to relay R2 is cut off and motor M stops, and at the same time, power to relay R3 is cut off and solenoid SQL is demagnetized. When the solenoid SQL is demagnetized, the retaining member 37 slides downward by the biasing force of the spring 38, thereby rotating the stopper 32 via the wire 33 from the lowered position B to the fall prevention position A. . Also, when the descending switch DW is released during the descent of the pallet 2, or when the stop switch ST is pressed, the descent of the pallet 2 is stopped in the same way, and the stopper 3
2 rotates from the pallet lowering position B to the fall prevention position.

Furthermore, when the drive chain 13 breaks when the pallet is lowered, the limit switch LSD is turned off in the same way as described above, so the motor M stops and the stopper 32 moves from the pallet lowering position B to the fall prevention position A. Rotate to. Therefore, the pallet 2 is prevented from falling because the locking member 35 locks with the stopper 32 located below the position when the drive chain 13 breaks.

Here, when the pallet 2 is raised or lowered by the lift switch UP and the drop switch DW, for example, the pallet 2
When the pallet 2 is raised, if the stop switch ST is pressed to stop the pallet 2, and then the lowering switch DW is immediately pressed to lower the pallet, the motor will rotate in the reverse direction. However, in this case, as shown in FIG. 7, the stopper 32 begins to rotate from the fall prevention position A and the limit switch LS
After Z1 is turned off, it takes t1 time for the stopper 32 to approach the pallet lowering position B and the limit switch LSZ2 to be turned on, thus preventing the back electromotive current that occurs when the motor M rotates in reverse. can do. In other words, a delay circuit corresponding to a conventional timer is constructed by utilizing the time difference when the stopper 32 rotates from the fall prevention position A to the pallet lowering position B.

Also, if the lower switch DW is pressed to lower the pallet 2, then the lower switch DW is released to stop the lowering of the pallet 2, and then the upper switch UP is immediately pressed to raise the pallet 2, the limit switch LSZ2 is Since the time t1 is required until the limit switch LSZI becomes "off" and the limit switch LSZI becomes "closed" as described above, it is possible to prevent the back electromotive current that occurs when the motor M reverses. In other words, the time difference in which the stopper 32 rotates from the pallet lowering position B to the fall prevention position A is utilized.

In addition, in this example, the limit switch LSZI.

Although two limit switches LSZ2 are shown, it is not always necessary to provide two limit switches, and these limit switches LSZ1. L.S.Z.
One limit switch may be sufficient as long as it has two functions.

FIG. 8 shows a schematic electrical circuit diagram of a two-stage parking device using a DC motor.

In FIG. 8, MDC is a DC motor, 50 is a charger,
51 is a battery. Reference numeral 52 denotes a motor control circuit, which is constructed in substantially the same manner as in the previous embodiment.

Here, in the above circuit, assuming that the current flowing through the DC motor MDC is 85 amperes for 30 seconds, and other required currents are considered to be about the same, the power consumption of the battery 51 is: 85X2X4÷120-5.7 (Ah) (4: Coefficient during rapid discharge).

Then, if this is charged in 10 hours and the efficiency of the charger 50 is 0.8, the current of AC100V input is 5.7X
24/10 x 0.8 x 100? 0.2(A)
becomes.

In other words, even a 3.5 m rd electric wire can be wired up to a length of about 2000 m. Here, when turning a 400W single-phase induction motor, it is known that if a 3.5m rrr wire is used, it will be difficult to start if the wiring is longer than 15m.

(Effects of the Invention) As described above, according to the present invention, a motor control circuit that replaces a conventional timer is configured with a mechanical configuration that utilizes the rotation time of the stopper, making the circuit simple and inexpensive. It can be made into Therefore, it can be easily installed for use in private residences.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the overall configuration of the two-stage parking device according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a rear view of the same, and Fig. 4 is a detection of loosening or breakage of the drive chain. Fig. 5 is an enlarged view showing the fall prevention device, Fig. 6 is an electric circuit diagram for controlling the motor, Fig. 7 is an explanatory diagram of the operation of the limit switch, Fig. 8
The figure is a schematic electrical circuit diagram of a two-stage parking device using a DC motor. ■... Strut 2... Bullet 32... Stopper 35... Locking member LSZI... Limit switch (1'! air contact point) L
SZ2... Limit switch (second air contact) A...
・Fall prevention device B...Pallet lowering position M...Motor ACloov Figure 6

Claims (1)

[Scope of Claims] 1) A two-stage parking device in which columns are erected on both sides of a pallet, and the pallet is movable up and down along the columns by rotational drive of a motor in forward and reverse directions, comprising: At least one stopper is provided at a suitable position in the vertical direction, and the stopper has a fall prevention position that prevents the pallet from falling by locking with a locking member that protrudes from the support and is fixed to the pallet; A control circuit for rotating the motor in the pallet lifting direction is provided to be rotatable and interlocked with each other so as to take a lowering position of the pallet which is recessed toward the side and is not locked by the locking member. A first electrical contact that detects that the stopper is in the drop prevention position and becomes "connected" is connected in series, and a control circuit for rotating the motor in the pallet lowering direction includes a control circuit that detects that the stopper is in the pallet lowering position. A second electrical contact that detects a certain condition and becomes "connected" is connected in series, and is configured to delay reverse rotation of the motor by using the time during which the first electrical contact and the second electrical contact are connected/disconnected. A motor control circuit for a two-stage parking device characterized by: