JP3077782B2 - Pallet fall prevention device for lifting parking system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a pallet from dropping in a lift type parking device.
In particular, the present invention relates to an apparatus capable of preventing malfunction of a stopper caused by freezing in a cold region.

[0002]

2. Description of the Related Art In a lift type parking apparatus, a pallet is raised and lowered to prevent the pallet from dropping when a chain or a wire for lifting the pallet is cut or a hydraulic cylinder for raising and lowering leaks oil. At times, the plunger is retracted by exciting the solenoid to retract the stopper from the pallet up / down passage.When the pallet is stopped, the solenoid is released and the plunger is moved forward by the spring force of the spring to project the stopper into the pallet up / down passage. A pallet fall prevention device is provided.

[0003]

However, since the lift type parking device is often installed outdoors, the stopper freezes on its guide in winter and does not operate even when the solenoid is excited, so that the pallet is raised and lowered. In some cases, it could not be done.

[0004]

According to the present invention, as a means for solving the above-mentioned problems, an AC voltage applying coil is provided on a support portion of a stopper as described in claims 1 to 5, and the AC voltage is applied to the coil. By applying an AC voltage to the application coil, heat due to resistance loss generated in the AC voltage application coil itself, heat due to resistance loss generated in a heating element provided on the outer periphery of the stopper of the stopper, or AC voltage application heat due to the resistance loss or iron loss occurs Sutotsupagaido provided between the supporting portion outer periphery of the inner and a stop of a coil of a stop
The configuration is such that heat is transmitted to the support portion or heat is generated by the iron loss in the support portion itself of the stopper.

[0005] In the above configuration, it is also possible to switch between energization of the AC voltage application coil and release thereof in accordance with the temperature of the stopper.

[0006]

According to the present invention, when an AC voltage is applied to the AC voltage applying coil, the heat generated in the AC voltage applying coil itself, the heating element or the stopper guide is transmitted to the stopper, or the heat is transferred to the stopper itself. By this, the stopper is heated and the temperature rises.If the stopper is not frozen, the stopper is prevented from freezing and the operable state is maintained.If the stopper is already frozen, The frozen portion is melted and the stopper becomes operable.

When the solenoid is excited in a state where the stopper is operable, the plunger is retracted, the stopper is retracted from the pallet up-and-down passage, and the pallet can be raised and lowered.

[0008] In the case of switching between energization of the coil for applying an AC voltage and release of the coil in accordance with the temperature of the stopper, when the stopper is continuously heated in order to prevent the stopper from freezing, It is possible to maintain the temperature of the stopper at a temperature higher than the freezing occurrence temperature while maintaining the temperature of the AC voltage application coil at or below the allowable temperature limit of heat resistance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In two long side frames 3a, 3a of a rectangular frame 3 whose four corners are supported by columns 2, two chains 4 looped around a sprocket, not shown, driven by a motor 7 are provided. The books are arranged one by one. These four chains 4 hang down below the frame 3 by the same length, and the lower ends of the four chains 4 have both ends of both long sides of a rectangular pallet 5 for mounting a car (not shown). Is attached to the hanging metal fitting 6.

When the button of the operation box 9 attached to the column 2 is operated, the four chains 4 are moved by the same length by the driving of the motor 7 in the liftable parking apparatus 1 having the above structure. The pallet 5 has a lowered position indicated by a chain line in FIG. 1 in which vehicles can be loaded on the pallet 5 on the road surface, and a solid line in FIG. 1 in which a space is provided below the pallet 5 so that other vehicles can park. It is configured to be driven up and down with the horizontal posture between the ascending positions shown.

Next, means for preventing the pallet 5 from dropping when the pallet 5 is at the raised position shown by the solid line in FIG. 1 will be described. Four brackets 8 are fixed to the frame 3 so that the hanging brackets 6 are adjacent to each other when the pallet 5 is in the raised position, and each bracket 8 does not interfere with the hanging bracket 6. And the solenoid 10 is fixed.

The solenoid 10 is composed of a core 12 and a coil 14 for stopping the operation wound around a coil bobbin 13 and is fixed in a housing 15. And a plunger 16 which is fitted freely. Housing 15 of solenoid 10
A cylindrical mounting body 17 having a flange 18 on its outer periphery is fixed to the opening at the tip of the solenoid, and the solenoid 10 is mounted by fitting the mounting body 17 into a mounting hole 19 of the bracket 8. ing.

At the tip of the plunger 16, a rod-shaped stopper 22 made of a magnetic metal material having excellent thermal conductivity such as steel is provided.
Are fixed by a connecting pin 21 so as to be horizontally moved together. A compression coil spring (corresponding to a spring which is a component of the present invention) 24 is mounted between the rear surface of the mounting plate 23 sandwiched between the plunger 16 and the stopper 22 and the front end surface of the solenoid body 11. Further, the plunger 16 and the stopper 22 are urged by the elastic force of the compression coil spring 24 in a direction in which the tip of the stopper 22 projects into the lifting passage of the hanging fitting 6 of the pallet 5.

A cylindrical heat insulating material 25 is fixed to the hollow inner periphery of the mounting member 17, and a specific electric resistance value of copper, copper alloy, aluminum or the like is provided on the inner periphery of the heat insulating material 25. A cylindrical stopper guide 26 made of a low metal material is fixed, and the stopper 22 is slidably fitted in the stopper guide 26.

[0015] The pallet fall prevention device having the above structure is
Normally, no DC voltage is applied to the stop operation coil 14 of the solenoid 16, and the stop 22 is caused to protrude into the lifting passage of the suspension fitting 6 of the pallet 5 by the bias of the compression coil spring 24. It is being held. As a result, when the pallet 5 is in the raised position shown by the solid line in FIG. 1, the tip of the stopper 22 enters the notch 28 opening below the hanging fitting 6, and the pallet 5 is supported by cutting the chain 4. In the case where the pallet 5 is lost, the pallet 5 is prevented from falling by the upper back surface of the notch 28 being hooked on the upper surface of the stopper 22.

In this state, when a DC voltage is applied to the stop operation coil 14 to excite the solenoid 10, the plunger 16 is attracted to the core 12 by magnetic attraction against the bias of the compression coil spring 24. As shown by a chain line in FIG. 3, the stopper 29 is held at a retracted position where the flange 29 is brought into contact with the distal end surface of the solenoid body 11, and
Of the pallet 5 is retracted out of the elevating passage of the hanging fitting 6, so that the pallet 5 can be raised and lowered without interfering with the stopper 22.

The pallet fall prevention device is provided with means for preventing the stopper 22 from freezing on the stopper 26 or for melting the already frozen portion. Hereinafter, the configuration will be described.

An accommodating portion 30 is formed at the rear end of the hollow portion of the mounting body 17 by expanding the inner circumference. In the accommodating portion 30, an AC voltage applying coil 32 is provided with a stop guide 26. It is provided so as to surround the stopper 22 while being wound around the outer periphery.

When an AC voltage is applied to the AC voltage applying coil 32, heat is generated in the AC voltage applying coil 32 due to a resistance loss based on an electric resistance at the time of energization. An electric current flows due to the magnetic flux of the AC voltage applying coil 32, and heat is generated due to a resistance loss based on its electric resistance. Further, an eddy current loss and a hysteresis loss ( Hereafter, heat is generated by iron loss).

The coil bobbin 13 of the solenoid 10
A switch 36 for applying a DC voltage to the coil 14 for stopping the operation, a switch 37 for applying an AC voltage to the coil 32 for applying an AC voltage, and a switch 37 for applying an AC voltage to the coil 32 for applying an AC voltage. A control circuit 35 including a thermostat 38 connected in the middle of a current supply path to the voltage application coil 32 and switching between energization to the AC voltage application coil 32 and release thereof according to the temperature of the stopper 22.
Is provided.

The control circuit 35 of each solenoid 10 is connected to the operation box 9 and an AC power supply 39. When the power switch (not shown) is closed by pressing the power button of the operation box 9, the stop operation of the operation box 9 is performed. When the stop button is pressed, the stop operation switch 36 closes to apply a DC voltage to the stop operation coil 14, and when the freeze prevention / cancellation button of the operation box 9 is pressed, the AC The voltage application switch 37 is closed, and the application of the AC voltage to the AC voltage application coil 32 and the release thereof are performed by the operation of the thermostat 38.

Next, the operation of the first embodiment will be described. If the stopper 22 is likely to freeze on the stopper guide 26 in a state where the tip of the stopper 22 protrudes into the elevating passage of the hanging fitting 6 of the pallet 5, the freeze prevention / release button of the operation box 9 is pressed. The AC voltage application switch 37 is closed to maintain a state in which the AC voltage can be applied to the AC voltage application coil 32.

During this time, when the temperature of the stopper 22 decreases to a temperature that may cause freezing, the thermostat 38
Is closed, and the AC voltage is applied to the AC voltage applying coil 32. As a result, heat due to resistance loss is generated in the AC voltage applying coil 32 and the stopper guide 26, and heat due to iron loss is generated in the stopper 22, and the heat is exposed to the outside air of the stopper 22 and the stopper guide 26, and the temperature is reduced. The temperature at which the temperature tends to decrease is heated to a temperature at which freezing does not occur.

Here, the stopper 22 is made of a material having excellent thermal conductivity, and a metal having a low specific electric resistance, which is a material of the stopper guide 26, is generally excellent in thermal conductivity. Heat is efficiently transferred to a portion where the temperature is significantly reduced and freezing is likely to occur.

When the temperature of the stopper 22 rises to a sufficiently high predetermined temperature at which there is no risk of freezing, the switch of the thermostat 38 is opened, and the application of the AC voltage to the AC voltage applying coil 32 is cut off. Thereby, the AC voltage applying coil 32, the stop guide 26, and the stop 2
2 stops generating heat, and the stopper 22 and the stopper guide 26 are no longer heated.

When the stopper 22 and the stopper guide 26 are no longer heated, the temperature of the stopper 22 gradually decreases, and the switch of the thermostat 38 closes when the temperature approaches a temperature at which freezing occurs. Thus, the AC voltage is applied to the AC voltage applying coil 32, and the stopper 22 and the stopper guide 26 are heated again.

The above operation is alternately repeated with a change in the temperature of the stopper 22, so that the stopper 22
Then, the stopper guide 26 is always maintained at a certain temperature or higher without fear of freezing, and the stopper 22 is maintained in an operable state.

Therefore, when the pallet 5 is to be raised and lowered, if the stop operation button of the operation box 9 is pressed, the stop 22 is immediately retreated to the outside of the lifting passage of the hanging fitting 6 of the pallet 5, and the pallet 5 is moved. It can be moved up and down without interference with the stopper 22.

Next, another example of use will be described. If the stop 22 is frozen on the stop guide 26 because the switch 37 for applying the AC voltage is kept open, the switch 37 for preventing the AC voltage from being applied is closed by pressing the anti-freeze / release button of the operation box 9. To achieve. At this time,
Since the temperature of the stopper 22 is lower than the freezing temperature and the switch of the thermostat 38 is closed, the application of the AC voltage to the AC voltage applying coil 32 starts at the same time when the freeze prevention / cancellation button is pressed.

As a result, heat due to resistance loss is generated in the AC voltage applying coil 32 and the stopper guide 26, and heat due to iron loss is generated in the stopper 22, and the heat is transmitted through the stopper 22 and the stopper guide 26. As a result, the frozen portion of the stopper 22 and the stopper guide 26 is heated and melted, and the stopper 22 becomes operable.

Thereafter, the pressing operation of the freeze prevention / release button is released to interrupt the application of the AC voltage to the AC voltage application coil 32, and the stop operation button 14 is pressed to apply a direct current to the stop operation coil 14. Apply voltage to solenoid 10
When the stopper 22 is excited, the stopper 22 is
To the outside of the elevating passage.

When the pallet 5 is used only by melting the frozen portion every time the pallet 5 is moved up and down as described above, a switch for applying an AC voltage is provided by using a control circuit from which a thermostat is removed. The AC voltage may be continuously applied to the AC voltage application coil 32 during the closing.

In this case, it is desirable that the time during which the AC voltage is applied be within a range such that the temperature of the coil 32 for applying the AC voltage does not exceed its allowable heat-resistant temperature.

In the first embodiment, the heat is generated not only by the AC voltage applying coil 32 but also by the stop 22 and the stop guide 26, but the heat is generated only by the AC voltage applying coil 32. Alternatively, the AC voltage applying coil 32 and the stopper 2 may be used.
2, or by using the AC voltage applying coil 32 and the stopper guide 26.

Similarly, in the first embodiment, heat generation in the stop guide 26 is caused by resistance loss by using a metal having a low specific electric resistance value as a material of the stop guide 26. By using a magnetic metal as the material of the stopper guide, heat generation in the stopper guide may be caused by iron loss.

In the first embodiment, the mounting member 17 is used.
Using a magnetic metal as a material for the AC voltage applying coil 3
2, heat may be generated by iron loss as in the case of the stopper 22. In this case, the heat generated by the AC voltage applying coil 32 is
Is prevented from being transmitted, and the heating efficiency of the stopper 22 and the stopper guide 26 can be improved.

Next, a second embodiment of the present invention will be described with reference to FIG. The apparatus of the second embodiment differs from the pallet fall prevention apparatus of the first embodiment in that the material of the stopper 22a is non-magnetic and has excellent heat conductivity, and the material of the stopper 26a is simply made of heat conductive material. The configuration is excellent.

In the outer periphery of the stopper 22a, a portion corresponding to the AC voltage applying coil 32 is reduced in diameter in a circumferential direction in a state in which a tip of the stopper protrudes into the lifting passage of the hanging bracket 6 of the pallet 5. An attachment recess 40 is formed, and an annular heating element 41 made of a metal material having a low specific electric resistance such as copper, a copper alloy, or aluminum is fitted in the attachment recess 40.

In the apparatus of the second embodiment having such a configuration, when an AC voltage is applied to the AC voltage applying coil 32, heat is generated in the AC voltage applying coil 32 due to resistance loss. At the same time, a current flows through the heating element 41 due to the magnetic flux of the AC voltage applying coil 32, and heat is generated due to resistance loss based on the electric resistance.

The heat generated in the AC voltage applying coil 32 and the heating element 41 heats the stopper 22a and the stopper guide 26a, so that the stopper 22a is prevented from freezing on the stopper guide 26a and the stopper 22a is prevented. Remains operational, or
The portion that has already been frozen is thawed, and the stopper 22a becomes operable.

In the second embodiment, the heat is generated only in the AC voltage applying coil 32 and the heating element 41. However, the material of the stopper guide 26a is made of a metal having a low specific electric resistance. Stopper guide 26a
Alternatively, heat may be generated due to resistance loss, or the stop guide 26a may be made of magnetic metal to generate heat due to iron loss in the stop guide 26a.

In the above embodiment, the case where the invention is applied to the lift type parking apparatus 1 using the chain 4 as the means for supporting the pallet 5 has been described. However, the present invention uses other means such as a wire and a hydraulic cylinder. The present invention can also be applied to an elevating parking device that uses a pallet to support the pallet.

[0043]

As has been made clear from the above description, the present invention is intended to freeze the stopper by heating the stopper by the heat generated in the coil for applying an AC voltage, the heating element, the stopper guide or the stopper itself. And prevent the malfunction of the stopper due to freezing, and maintain reliable operation even in cold climates. There is an effect that can be done.

Further, since the AC voltage applying coil is provided so as to surround the stop, the heat generated in the AC voltage applying coil can be efficiently transmitted to the stop.
There is an effect that the power consumption cost can be kept low.

[Brief description of the drawings]

FIG. 1 is a perspective view of an elevating parking device.

FIG. 2 is a partially enlarged perspective view showing a pallet falling prevention means.

FIG. 3 is a partially cut-away enlarged side view of the first embodiment.

FIG. 4 is a configuration diagram of a control circuit according to the first embodiment.

FIG. 5 is a partially cutaway enlarged side view of the second embodiment.

[Explanation of symbols]

1: Elevating parking device 5: Pallet 10: Solenoid 16: Plunger 22, 22a: Stopper 24: Compression coil spring (spring) 32: AC voltage application coil

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04H 6/06

Claims (6)

(57) [Claims] 1. A during lifting of the palette with a stop retracting the plunger is retracted from the lifting path of the palette by energizing the solenoid, the pre Symbol a stop releases the excitation of the solenoid during stop of the pallet palette In the pallet fall prevention device of a lift type parking device which is projected to the lift passage of the vehicle, an AC voltage applying coil is provided on a support portion of the stopper , and the AC voltage is generated by applying an AC voltage to the AC voltage applying coil. The magnetic flux is passed through the support portion of the stopper made of a magnetic material to generate an iron loss, and the support of the stopper is generated.
A pallet fall prevention device for a lift-type parking device, wherein the portion is heated. Wherein at the time of lifting of the palette with a stop retracting the plunger is retracted from the lifting path of the palette by energizing the solenoid, the pre Symbol a stop releases the excitation of the solenoid during stop of the pallet palette In a pallet fall prevention device of a lift type parking device which is made to protrude into a lifting passage, a coil for applying a voltage is provided on a support portion of the stopper, and
Wherein the outer periphery of the supporting portion is provided a heating element annulus consisting of metal material having low electrical resistivity values, generated by connexion the heating element to the application of the prior SL conductive coining Kayo electrostatic <br/> pressure to the coil resistance A pallet fall prevention device for a liftable parking device, wherein heat due to loss is transmitted to the support portion of the stopper. Wherein at the time of lifting of the palette by removing all a stop to retract the plunger by energizing the solenoid from the lifting path of the pallet, said pallet stopping <br/> sometimes said to advance the pre-Symbol plunger a stop In a pallet fall prevention device of a liftable parking device in which the stop is projected into a lift passage of the pallet ,
An AC voltage applying coil is provided on the supporting portion , and a tubular stopper guide made of a metal material having a low specific electric resistance is provided between an inner periphery of the AC voltage applying coil and an outer periphery of the supporting portion of the stopper. A pallet fall prevention device for a lift-type parking device, wherein heat caused by resistance loss generated in the stop guide by application of an AC voltage to the AC voltage application coil is transmitted to a support portion of the lift type parking device. . Wherein during lifting of the palette with a stop retracting the plunger is retracted from the lifting path of the palette by energizing the solenoid, the pre Symbol a stop releases the excitation of the solenoid during stop of the pallet palette In a pallet fall prevention device of a lift type parking device which is made to protrude into a lift passage, an AC voltage application coil is provided so as to surround a support portion of the stopper.
The inner circumference of the AC voltage applying coil and the support of the stopper
A tubular stopper guide made of a magnetic material is provided between the holder and the outer periphery of the holder, and heat generated by iron loss generated in the stopper guide by application of an AC voltage to the AC voltage applying coil is applied to the support portion of the stopper. A pallet fall prevention device for a lift type parking device, wherein the pallet is transmitted. Wherein at the time of lifting of the palette with a stop retracting the plunger is retracted from the lifting path of the palette by energizing the solenoid, said pallet stopping <br/> sometimes be advanced pre Symbol plunger a stop In a pallet fall prevention device of a liftable parking device in which the stop is projected into a lift passage of the pallet ,
An AC voltage applying coil is provided so as to surround the supporting portion, and heat due to resistance loss generated in the AC voltage applying coil due to application of the AC voltage to the AC voltage applying coil is applied to the supporting portion of the stopper. A pallet fall prevention device for a lift type parking device, wherein the pallet is transmitted. 6. The system according to claim 1, wherein switching between energization of said AC voltage application coil and release thereof is performed in accordance with the temperature of said stopper.
A pallet fall prevention device for a liftable parking device according to claim 1.