JPH0676554U - Lower limit pallet position detection device for multilevel parking system - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pallet lower limit position detection device which stably and reliably lowers four pallet suspension chains to the lower limit position to land the pallet in a stable state. [Structure] The electric motor 5 is driven by a pallet suspension chain 3
Drive chain 1 wound between a drive sprocket 7 and a sprocket 8 to be transmitted to a drive shaft 9 for moving up and down
1, a chain tensioner Q consisting of a pair of swing arms 18a and 18b and a limit switch 17 are attached,
The lower limit position of the pallet is detected by switching ON and OFF in synchronization with the operation of the chain tensioner Q.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pallet lower limit position detecting device for safely and reliably performing a pallet that is loaded with a vehicle and moves up and down in a multi-level parking device having a two-stage type or a multi-stage type.

[0002]

[Prior art]

 A multi-tiered multi-level parking device that transports a vehicle loaded on a pallet upward and stores the vehicle in two or more tiers is a standing pillar, and a side of each tier mounted on the pillar. The structural frame composed of the girders is provided with the vehicle conveying devices at the respective stages. The vehicle transporting device at each of these stages is mainly composed of a pallet for loading vehicles, an electric motor, a chain for suspending the pallet so that the pallet can be moved up and down, wires, and the like. It is designed to be raised while keeping it horizontal, and to be lowered by reverse rotation drive.A detection device for stopping these pallets at the upper and lower limit positions is provided, as well as a pallet fall prevention device and an emergency stop. A safety device such as a device is provided.

As a pallet lower limit position detecting means for stopping at the descending end of the pallet in such a multi-level parking apparatus, conventionally, a limit switch is attached to the lower surface of the pallet and a direct detection method of turning off when the pallet lands is used. However, since this detection means requires wiring on a pallet that moves up and down, there is a risk that a malfunction of the switch may occur due to damage to the wiring and a serious accident may occur, and the wiring cost increases. It was Of course, as a detection means for eliminating this drawback, for example, in the proposal by Japanese Patent Laid-Open No. 3-260269, there is a method in which a limit switch is attached to the fixed end of the pallet to detect the looseness of the hanging chain to detect the pallet lower limit position. The proposal of Japanese Patent Publication No. 53-17102 shows a method of detecting the lower limit position of the pallet by detecting the looseness of the chain at the intermediate portion between the pallet suspension chain and the lifting drive sprocket.

However, the former detection method of attaching a limit switch to the fixed end of the pallet suspension chain has a structure in which the fixed end of the suspension chain is not tied to the structure frame side even if it can be used in a specific pallet lifting drive system. It has the drawback that it cannot be used in the drive system, and in the latter method of detecting chain looseness in the middle between the pallet suspension chain and the drive sprocket, the limit switch that detects the looseness of the suspension chain has four suspension chains. It is usually attached to one of the lower chains, but if the limit switch is attached to one of the four chains, there is an unbalance in the length of the four chains, especially the switch. If the mounting chain is longer than the other chains, the pallet will float as a result of the other chains landing earlier and operating OFF before fully landing. There is a possibility that it will be in the state where it was. Of course, in order to avoid this problem, it is possible to solve the problem by mounting limit switches on all four chains, but this is uneconomical.

[0005]

[Problems to be solved by the device]

 The present invention has been made in order to improve the above-mentioned conventional drawbacks, and it is possible to inexpensively and surely lower the four pallet suspension chains to the lower limit position and land the pallets in a stable state. Another object of the present invention is to provide a pallet lower limit position detection device for a multi-level parking device that realizes a high level of safety that stops lowering when foreign matter is present on the ground or when an abnormality occurs in the lifting drive mechanism.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention includes a sprocket in which a vehicle-mounted pallet suspended from a parking structure frame is attached to an output shaft of an electric motor with a reduction gear, a drive chain wound around the sprocket, and the chain. In a multi-story parking apparatus having a driven sprocket to be driven and a pallet elevating / lowering mechanism configured to move up and down by a drive shaft rotated by the driven sprocket, both sides of a drive chain wound between the two sprockets. A chain tensioner consisting of a pair of swing arms attached to the tips of the rollers is attached so that it is biased by a spring. Is attached, and ON / OFF switching is performed in conjunction with the operation of the tensioner. It is those that have achieved the purpose of the.

[0007]

[Action]

 A pallet suspended by a chain is a drive chain wound between a sprocket that is attached to the output shaft of an electric motor with a speed reducer of a lifting drive mechanism and the end driven sprocket of the drive shaft that carries the pallet suspension chain. On the tension side of the pallet, tension is applied even when it is in the upper limit position during the ascending / descending movement other than the pallet lower limit position.Therefore, the limit switch attached close to the chain tensioner installed on this tension side is It is pushed by this tensioner to maintain the ON operation state. Then, when the pallet drops to the lower limit position, the tension that had been acting on the drive chain until then is released and the tension swings, so both swing arms of the tensioner also move inward due to the biasing of the springs and hit the limit switch until then. The contact state is released, the switch is switched to OFF, and the lower limit position of the pallet is detected by the OFF operation of this switch. The detection stops the electric motor and completely stops the descent of the pallet.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are a side view and a rear view of a two-stage parking apparatus having a pallet lower limit position detecting device according to the present invention. In the figure, a structure frame 1 of a parking device is provided with four columns 1a to 1d standing upright in the front-rear and left-right directions that support a pallet 2 loaded on a vehicle so that the pallet 2 can be moved up and down, and the columns 1a to 1d are mounted in the front-rear direction. It is composed of horizontal beams 1e and 1f that are hung.

The pallet 2 is suspended at its four corners by four chains 3 attached so as to hang down along the guide grooves of the above-mentioned four columns 1a to 1d having a U-shaped cross section. The pallet raising / lowering drive mechanism S installed at a position on one side of the upper end of the No. 1 allows the four hanging chains 3 to be wound and unwound so as to be lifted and lowered.

A schematic structure of the pallet lifting drive mechanism S will be described with reference to FIGS. 3 and 4. An electric motor 5 with a speed reducer is installed on a pedestal 4 fixed on the structural frame 1, and the motor output shaft A drive shaft 9 having a driven sprocket 8 pivotally supported at its end is inserted into a hollow horizontal beam 1e at the lower part of a sprocket 7 pivotally mounted on a shaft 6, and both ends thereof are rotatably supported by bearings 10a and 10b, respectively. ing. A drive chain 11 is wound between the two sprockets 7 and 8, and the rotational drive of the motor 5 is transmitted to the drive shaft 9 via the sprocket 5, the drive chain 11, and the driven sprocket 8, and The hanging chain 3 which is engaged with chain sprockets 12a and 12b pivotally supported on both ends of the shaft 9 is movable in the vertical direction. A cover 13 covers the pallet lifting drive mechanism S to prevent rainwater from entering. Reference numeral 14 denotes a balance chain, which extends from one support column 1b through the pallet 2 to the other support column 1d in order to balance the palette 2 as the pallet 2 moves up and down, and follows the vertical movement. Is adjusted. Further, 15 is a pallet drop prevention device for holding the pallet 2 at the upper limit position, and when the pallet 2 reaches the upper limit position, the hook 15a automatically engages with the safety holding shaft 15b by the operation of a limit switch or the like. When descending, the hanging state is automatically released at the same time when the descending switch is turned on. The pallet raising / lowering operation and the emergency stop operation are performed by the button switch of the operation panel 23 shown in FIG.

The two-tiered parking system configured as described above is provided with a pallet lower-tier position detection device Q. As shown in FIG. 3, the detection device Q is composed of a chain tensioner tightly attached to the drive chain 11 of the pallet lifting drive mechanism S and a limit switch 17 provided near the tensioner 16.

First, the chain tensioner 16 is composed of a pair of swingable swing arms 18a and 18b which are installed so as to sandwich the drive chain 11 from both sides. The swing arms 18a and 18b are provided with tip ends respectively. A rotatable roller 19 is rotatably supported, and a base end portion thereof is attached to a bracket 21 by a shaft pin 20. The pair of swing arms 18a and 18b, which are thus swingable, are connected by springs 22 and are urged to press the drive chain 11 from both sides. The roller 19 rolls on the chain 11 when movable. Further, a limit switch 17 is provided in proximity to one swing arm 18a side installed on the tension side of the drive chain 11, and a roller 17b attached to the tip of the switch lever 17a is near the tip of the swing arm 18a. It is located in the center.

Next, the operation of the pallet lower limit position detecting device Q including the chain tensioner 16 and the limit switch 17 will be described with reference to FIG. When the pallet 2 is moved up and down, tension is applied to the drive chain 11 due to the weight of the pallet, so that the pair of left and right swing arms 18a and 18b are located outside by the chain 11 regardless of the bias of the spring 22. Each roller 19 rolls on the tensioned chain 11, while the roller 17a of the limit switch 17 is pushed outward by the swing arm roller 19 so that the switch ON operation is maintained. It has become. Then, as shown in FIG. 5 (a), the pallet 2 reaches the upper limit position and one of the drive chains 11 is loosened. Even if the swing arm 18b on the loose side moves inward, the tension on the opposite tension side is increased. However, since the detector Q is dedicated to detecting the pallet lower limit position, the upper limit position is not mistakenly detected as the lower limit position.

When the pallet 2 descends from the upper limit position and reaches the lower limit position, the drive chain 11 completely loses tension and relaxes, as shown in FIG. 5B, so that both swing arms 18 a and 18 b are provided with springs 22. The force wins and leans inward, transforming the chain 11 into a cocoon shape. As a result, since the swing arm 18a on the tension side, which has been pushing the roller 17b of the switch lever 17a, moves inward, the switch lever 17a is released from the pushing state and moved inward to be turned off.

Although the present embodiment has been described with respect to the two-stage parking system as described above, the present invention is not limited to the two-stage parking system and can be implemented in a multi-stage multi-storey parking system having more than two stages. It is sufficient to attach a pallet lower limit position detection device consisting of a chain tensioner and a limit switch of the same structure to the drive chains of each stage, and there is no difference from the case of a two-stage parking device.

[0016]

[Effect of device]

 The present invention is as described above, and the pallet lower limit position detection device according to the present invention is made by paying attention to the tension acting on the drive chains, so that the tension of the drive chains can be maintained until the four suspension chains are completely loosened. Since it is working, the four corners of the pallet are completely landed, and it is the most effective and reliable detection means, especially when there is something foreign on the ground or there is a failure in the safety hook, etc. When is stopped, tension is not applied to the drive chain and it stops, which is also beneficial from a safety point of view. Furthermore, since this detection device has a simple structure, it is inexpensive, easy to wire and maintain, and can be easily attached to an existing multilevel parking device.

[Brief description of drawings]

FIG. 1 is a side view of a three-dimensional device including a pallet lower limit position detection device according to the present invention.

FIG. 2 is a rear view of a three-dimensional device including a pallet lower limit position detecting device according to the present invention.

FIG. 3 is a partially cutaway side view showing a pallet lifting drive mechanism.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is an operation explanatory view of the pallet lower limit position detection device, and FIG. 5A is an operation explanatory view at the pallet upper limit position;
(B) is an explanatory operation diagram at the pallet lower limit position.

[Explanation of symbols]

 1 Structural Frame 2 Pallet 3 Suspending Chain S Pallet Elevating Drive Mechanism 5 Electric Motor with Reducer 7 Drive Sprocket 8 Driven Sprocket 9 Drive Shaft 11 Drive Chain 12a, 12b Suspended Chain Sprocket 14 Balance Chain 15 Pallet Drop Prevention Device Q Pallet Lower limit position detector 16 Chain tensioner 17 Limit switch 18a, 18b Swing arm 19 Roller 22 Spring 23 Operation panel

Claims (4)

[Scope of utility model registration request] 1. A sprocket in which a vehicle-mounted pallet suspended from a parking structure frame is attached to an output shaft of an electric motor with a speed reducer, a drive chain wound around the sprocket, and a driven sprocket driven by the chain. And, in a multi-story parking apparatus having a pallet elevating and lowering drive mechanism which is moved up and down by a drive shaft rotated by the driven sprocket, a chain tensioner is tightly attached to a drive chain wound between the two sprockets, Further, a pallet lower limit position detection device in a multi-story parking apparatus, characterized in that a limit switch for switching ON and OFF in conjunction with the operation of the tensioner is attached in proximity to the tensioner. 2. The chain tensioner is installed so that a pair of swingable swing arms, each having a roller attached to the tip end thereof, are sandwiched on both sides of the drive chain, and the tip end rollers of both swing arms are attached to the drive chain. The pallet lower limit position detecting device in the multi-level parking device according to claim 1, wherein both arms are urged inward by springs so as to always contact the chain in accordance with the looseness of the pallet. 3. The pallet lower limit position detecting device in a multi-level parking device according to claim 1, wherein the limit switch is attached in close proximity to the tension side of the drive chain. 4. The pallet lower limit position detecting device in a multi-level parking device according to claim 1, wherein the pallet lower limit position detecting device is attached to each pallet drive chain of each stage of the multi-stage parking device.