JPH0835350A - Two stage type parking device - Google Patents

Abstract

PURPOSE:To prevent possible damage with a motor suspended when a pallet is hit against any obstacle while it is being lowered down by providing a limit switch for the pallet support section of a two stage type parking device employing a screw shaft type elevating means. CONSTITUTION:A nut 30 which is inserted into the center hole of the support plate section 27a of a bracket 27 fixed onto a connection member 26, is engaged with a screw shaft 31 which is rotatably and vertically supported on a machine frame, and a pallet support section, a pallet and the weight of a vehicle are thereby supported on a flange section 36a. Paired bolts 39 are slidably inserted into the support plate section 27a and the flange section 36a, and a lock nut 39a is fixed onto its lower end. Meanwhile, a limit switch 50 is installed onto a mounting plate 53 at the tip end of the support plate section 27a, and the roller 52 of an operating lever is brought into contact with the lower surface of the flange section 36a. A motor is driven, while the pallet is lowered down via a nut 36, if the pallet is blocked in lowering by an obstacle, and when the flange section 36a is lowered down while being separated by a distance more than a specified one from the support plate section 27a, the limit switch 50 is actuated, and the motor drive is thereby suspended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage type having a relatively simple structure which is equipped with a pallet for mounting a vehicle and which can be moved up and down so that another vehicle can be parked in the space below the raised pallet. Regarding parking equipment.

[0002]

2. Description of the Related Art A two-stage parking system of this type is actually used
As disclosed in JP-A-3-186854, nuts fixed to a pallet for mounting a vehicle are screw-engaged with a plurality of screw shafts rotatably supported vertically by a machine frame, and the screw shafts are rotated by a motor. There is one that is driven to raise and lower the pallet. Further, as disclosed in Japanese Patent Laid-Open No. 5-195642, a pallet is cantilever-supported by an elevating part that is vertically guided and supported by a mast of a machine frame via a plurality of guide rollers, and is vertically supported on the machine frame side. There is also one in which a nut on the elevation part side is screw-engaged with one provided screw shaft and the screw shaft is rotationally driven by a motor to elevate the pallet. In either case, when the pallet reaches the highest position or the lowest position, the limit switch is activated to stop the motor.

[0003]

However, on the lower side of the pallet or a member such as a lifting unit that moves together with the pallet,
If you leave an obstacle such as a tool box behind, the pallet will come into contact with such an obstacle before the pallet reaches the lowest position and the motor will stop, preventing the pallet from descending. A force that pushes the screw shaft upward is generated between the screw shaft and the screw shaft. Therefore, an unreasonable force may be generated on the screw shaft, the nut, or a portion supporting them, and these portions may be damaged.

As a means for solving such a problem, for example, as disclosed in Japanese Utility Model Laid-Open No. 5-10656, it is considered to provide a mechanical or photoelectric obstacle sensor below the pallet. Since the obstacle sensor needs to cover the entire lower surface of the pallet, there is a problem that the structure is complicated and expensive. The present invention aims to solve each of these problems.

[0005]

According to the present invention, a nut 36 provided in a portion for supporting a pallet 40 on which a vehicle is mounted is screw-engaged with a screw shaft 31 rotatably supported vertically by a machine frame 10. The motor 36 rotates the screw shaft 31 to raise and lower the pallet 40 via the nut 36. The nut 36 is the pallet 40.
The pallet is structured so as to support rotation of the portion supporting the pallet and abut downwardly so as to be separable from the lower side so as to support the pallet. The downward separation of the nut 36 from the portion supporting the pallet 40 is detected. A detection means 50 is provided, and a control device 55 that stops the operation of the motor 35 when the detection means detects a separation is provided.

[0006]

The motor 35 operates in response to a command signal from the user, and raises and lowers the pallet whose weight is supported by the nut 36 screw-engaged with the ball screw shaft 31 and the vehicle mounted on the pallet. When the pallet 40 descends, the pallet 40 comes into contact with an obstacle while the pallet 40 descends to a predetermined lowermost position, and the motor 3
If the lowering of the pallet 40 is prevented despite the operation of the pallet 5, the nut 36 is freely lowered while being spaced downward from the portion supporting the pallet 40. This separation is detected by the detection means 50, and the control device 55 stops the operation of the motor 35 based on this detection.

[0007]

EXAMPLES The present invention will be described below with reference to examples shown in FIGS. Mainly as shown in FIGS. 1 and 2,
The machine frame 10 of the present embodiment is made of a thick steel plate, and has a base 11 having a notch 11a at the center of one side, and the base 1
It has a pair of side pillars 12 which are vertically erected and fixed in parallel with each other on one other side portion, and the upper ends of both side pillars 12 are connected by a top plate 13. Each side pillar 12 is a channel steel material facing each other inwardly (see FIG. 3), and each side pillar 12 is
At the lower ends of a pair of suspension plates 15 provided parallel to each other on the inside of the upper part and fixed to the top plate 13 at their upper ends, both ends of a horizontal beam 14 made of downward channel steel are fixed. There is.

The central column 16 made of a channel steel with a lip is vertically arranged so that its open side is the notch 11a side of the base 11 (hereinafter simply referred to as the front side), and the central portion of the cross beam 14 and the upper and lower ends of the base 11. Is fixed and both members 14,
11 are connected. The side pillars 12 and the central pillar 16 are connected by horizontal plates 17 at two positions in the vertical direction. The respective members 11 to 17 forming the machine frame 10 are integrally joined by welding or the like, and the joining portion between the base 11 and the side column 12 is reinforced by the stay 12a. Base 11
Are fixed on the installation surface G by anchor bolts (not shown) or the like.

As shown mainly in FIGS. 3 and 4, the elevating part 20 is formed by integrally connecting a pair of left and right arm assemblies 21 by a connecting member 26. Each arm assembly 21
Is a vertically long arm body 22 and an inner plate 2 located at the bottom.
3, front and rear connecting plates 24a, 24b and gusset 25,
It is integrally formed by welding. The lower part of the arm body 22 and the inner side plate 23 are formed in an L shape having a horizontal portion extending to the front side at the lower end.

The elevating part 20 is located between the side columns 12, and is vertically guided and supported by the side columns 12 via a vertical guide roller 28 and a lateral guide roller 29 provided in each arm assembly 21. A pair of upper and lower vertical guide rollers 28 rotatably supported by a support shaft 28a protruding and fixed outward from the upper and lower portions of the arm body 22 have front and rear sides of the side columns 12 each having an outer peripheral surface having a groove-shaped cross section. It comes into contact with the inside of the flange and receives the bending moment of the pallet 40 which is cantilevered by the elevating part 20 and the vehicle mounted thereon as described below. Spindle 2 fixed in upper and lower cutouts 22a of arm body 22
A pair of upper and lower lateral guide rollers 2 rotatably supported by 9a
9, each outer peripheral surface abuts on the bottom surface of the groove of the side column 12, and the lifting portion 2
The horizontal movement and inclination of 0 are regulated.

As shown in FIGS. 1 to 4, the pallet 40
Is provided in correspondence with the distance between the pair of arm assemblies 21.
A frame 42 having a pair of parallel forks 41 and integrally connected by welding, and a floor plate 43 provided thereon. A pallet 40 has a step plate 40a of which the height gradually decreases at one end, and a first wheel stop 45 and a second wheel stop 46 protruding upward from the floor board 43 are provided at the other end of the pallet 40. ing. As shown in FIG. 3 and FIG. 4, a stop plate 41b is provided at the tip of the fork 41 projecting toward the elevating part 20, and a support plate 41 is provided slightly above the top surface.
a is fixed by welding. Pallet 40 is fork 4
(1) The top surface of the tip end portion is brought into contact with the bottom surface of the rear connecting plate 24b, and the bottom surfaces of both end portions of the support plate 41a are brought into contact with the top surfaces of the lower portion of the arm body 22 and the horizontal portion projecting forward of the inner side plate 23. Cantilevered by 20.

As shown in FIGS. 3, 5 and 6, both ends are bolted and fixed to the front connecting plates 24a so that the left and right arm assemblies 21 are integrally connected to each other. A reinforcing plate 26a is welded and fixed to the bracket, and a bracket 27 including a support plate portion 27a and a stay portion 27b is fixed to the rear surface by welding or the like. The ball nut 36 of the lifting device 30 described below is inserted into the hole provided in the center of the support plate portion 27a from below, and the flange portion 36a of the ball nut 36 is brought into contact with the lower surface of the support plate portion 27a so that the arm assembly is assembled. The weight of the three-dimensional body 21, the pallet 40, and the vehicle mounted thereon is supported.

Next, an elevating device 30 for elevating the elevating part 20.
Explain. As shown in FIGS. 1, 3, and 5, a motor base 32 that supports a motor 35 is supported on the cross beam 14 of the machine casing 10. The vertical ball screw shaft 31 located inside the central pillar 16 has an upper end portion 31 a having a horizontal beam 14.
Through the hole 14a provided in the motor base 32, and is suspended and supported by the motor base 32 via a pair of angular ball bearings 33 tightened and fixed by a nut 33a.

The bracket 27 of the elevating part 20 is inserted into the central column 16 from the release side, and the screw shaft 31 is inserted into the support plate part 27a through the notch at the tip and then lowered to be screwed into the screw shaft 31. The nut 36 is supported on the flange portion 36a. In this state, a pair of bolts 39 symmetrically arranged with respect to the central axis of the ball nut 36 are slidably inserted into the support plate portion 27a and the flange portion 36a, and fixed to the lower end portions of the bolts 39. The distance between the pair of lock nuts 39a and the head of the bolt 39 is
It is considerably larger than the sum of the thicknesses of the support plate portion 27a and the flange portion 36a. As a result, the flange portion 36a of the ball nut 36 abuts against the support plate portion 27a of the bracket 27 of the elevating portion 20 that supports the pallet 40 and the vehicle mounted on the pallet 40 from below to support these portions, and the support plate Part 27
The rotation is restrained with respect to a and it can be separated downward.

An upper end portion 31a of the ball screw shaft 31 is connected to an output shaft 35a of a motor 35 with a reduction mechanism attached to a motor base 32 via a flexible interlocking shaft coupling 34 and rotated to form a ball screw shaft. An electromagnetic brake 37 that prevents the ball screw shaft 31 from rotating in a stopped state is provided between the upper end 31 a of the motor 31 and the motor base 32. In this embodiment, the motor base 32 is mounted on the horizontal beam 14 so that the torque reaction force generated by the rotational driving of the screw shaft 31 is vertically fixed to the horizontal beam 14 and is set in the hole 32a of the protruding portion of the motor base 32. It is received by the inserted rod 38.

Mainly as shown in FIGS. 3 and 6 to 8,
The roller 52 at the tip of the operating lever 51 of the limit switch (detection means) 50 attached to the lower side of the support plate 27a via the attachment plate 53 fixed to the tip of the support plate 27a of the bracket 27 is the flange of the ball nut 36. It is in contact with the lower surface of 36a. As shown in FIGS. 6 and 7, the limit switch 50 is inoperative when the flange portion 36a is in contact with the lower surface of the support plate portion 27a, but as shown in FIG. A predetermined distance from the lock nut 39 of the bolt 39
If the operating lever 51 swings downward with a distance of less than (a distance less than the contact with a)), the limit switch 50 is activated and turned off.

As shown in FIG. 9, the control device 55 for controlling the operation of the motor 35 includes a detecting means 50, up and down buttons 56 and 57, and upper and lower limit switches 58 and 58.
59 (all limit switches) are connected. The upper and lower limit switches 58 and 59 are for the pallet 4 respectively.
When 0 reaches the highest position or the lowest position, it is activated and turned off.

Next, the operation of the above embodiment will be described. If the ascending / descending part 20 and the pallet 40 are at the lowest position shown by the solid lines in FIGS. 1 and 2, if the ascending button 56 is pressed, the electromagnetic brake 37 is released, the motor 35 operates in the ascending direction, and the ball screw shaft 31 is released. Is rotated, and the elevating part 20 is raised together with the pallet 40 via the ball nut 36. When the elevating part 20 and the pallet 40 reach the highest position shown by the chain double-dashed line and the upper limit switch 58 operates, the motor 35 stops, the electromagnetic brake 37 operates, and the elevating part 20 and the pallet 40 stop. If the down button 57 is pressed from this state, the electromagnetic brake 37 is released, the motor 35 operates in the down direction, and the ball screw shaft 31 and the ball nut 3 are operated.
The elevating part 20 and the pallet 40 are lowered via 6 and when the lower limit switch 59 is actuated to reach the lowest position, the elevating part 20 and the pallet 40 are similarly stopped.

During the descending operation, the pallet 40 or the elevating part 20 abuts on an obstacle while the motor 35 is operating while the pallet 40 is descending to the lowest position.
If the lowering of the support plate 27 is prevented by the bolt 39.
The flange portion 36a of the ball nut 36, which is prevented from rotating with respect to a, is separated from the lower surface of the support plate portion 27a. Then, when the flange portion 36a is separated downward from the support plate portion 27a by the predetermined distance or more and the limit switch 50 is activated and turned off, the control device 55 stops the operation of the motor 35, and the lifting unit 20 and the pallet. Stop the descent of 40. During this time, the flange portion 36a freely descends without coming into contact with the lock nut 39a of the bolt 39, so that the ball screw shaft 31, the ball nut 36, or a portion supporting them is not forcedly forced. In a normal operating state, the ball nut 36 is in contact with the bracket 27 of the elevating part 20 supporting the pallet 40 from below and supports them, so that they can be moved relatively relative to each other. Since the centering of the ball nut 36 is automatically performed, no twisting occurs between the two members 31, 36, and therefore the durability is improved.

In the above embodiment, the limit switch 50 is used as the detecting means for detecting the separation of the flange portion 36a of the ball nut 36 from the bracket 27, but the present invention is not limited to this, and a photo interrupter or a reflection type photo sensor is used. This separation can be detected by a sensor, a reed switch, a capacitance sensor, or the like. In addition, although the above-described embodiment has described the two-stage parking apparatus of the type in which the pallet 40 is cantilevered by the pair of elevating units 20, the present invention is not limited to this, and column portions are provided on both sides of the pallet.
It can also be applied to a multi-story parking system in which a pallet is supported on both sides by a plurality of sets of lifting units.

[0021]

As described above, according to the present invention, the operation of the motor is stopped when the pallet or the member moving together with the pallet comes into contact with the obstacle while the pallet is descending to the predetermined lowermost position. Therefore, there is no fear that the screw shaft, the nut, or the portion supporting them will be unduly applied to damage these portions. Moreover, the contact of the nut with the obstacle is detected by the downward separation of the nut from the pallet, and the detection means necessary for detecting such a local separation is relatively simple in structure, so that the descending In this case, it is possible to reduce the cost required to prevent the damage of the two-stage parking apparatus due to the contact between the pallet or the member moving together with the pallet and the obstacle.

[Brief description of drawings]

FIG. 1 is an overall front view of a cantilever type two-stage parking device according to the present invention.

FIG. 2 is a right side view of the embodiment shown in FIG.

FIG. 3 is an enlarged cross-sectional view taken along line 3-3 of FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line 4-4 of FIG.

5 is an enlarged cross-sectional view showing the lifting device of the embodiment shown in FIG.

6 is an enlarged cross-sectional view taken along line 6-6 of FIG. 3 except for the central pillar.

FIG. 7 is a right side view of FIG.

FIG. 8 is an enlarged cross-sectional view similar to FIG. 6 in a state where the flange portion of the ball nut is spaced downward from the bracket.

FIG. 9 is a block diagram showing a control system of a motor.

[Explanation of symbols]

10 ... Machine frame, 31 ... Screw shaft (ball screw shaft), 35 ... Motor, 36 ... Nut (ball nut), 40 ... Pallet, 50 ... Detecting means (limit switch), 55 ... Control device.

Claims (1)

[Claims] 1. At least one screw shaft rotatably supported vertically by a machine frame, and at least one nut provided in a portion supporting a pallet on which a vehicle is mounted and screw-engaged with the screw shaft. In a two-stage parking apparatus including a motor that drives the screw shaft to rotate to move the pallet up and down through the nut, the nut is restrained from rotating with respect to a portion that supports the pallet and is moved downward. A detecting means for detecting the downward separation of the nut with respect to a portion supporting the pallet, and the detecting means for detecting the separation. A two-stage parking apparatus comprising a control device for stopping the operation of the motor.