JP2008214056A - Portal lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portal lifter using one sensor for synchronizing the lift-up/-down positions of a pair of right and left telescopic supporting columns with each other. <P>SOLUTION: The portal lifter 1 is provided for carrying an object H to be carried which is hung down from a lateral beam part 4 mutually joining a pair of telescopic supporting columns 3 erected on a pair of right and left carriages 2. It comprises two drive units 10A, 10B for giving individual telescopic motion to each of the telescopic supporting columns 3, and a level 5 (an inclination detecting means) for detecting the inclination of one telescopic supporting column 3B out of the pair of telescopic supporting columns 3. The drive unit 10B corresponding to one telescopic supporting column 3B lifts one telescopic supporting column 3B up and down in accordance with an inclination detection signal from the level 5 so that the inclination is smaller. The drive unit 10A corresponding to the other telescopic supporting column 3A lifts the other telescopic supporting column 3A up and down in response to an operation signal from an operator. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gate-type lifter that can suspend an object to be conveyed and convey it, and in particular, a pair of carriages that are spaced apart from each other on the left and right sides, and a pair of legs that are vertically extendable on each carriage. The present invention relates to a gate-type lifter that includes a telescopic strut and a lateral beam portion that connects the pair of telescopic struts, and is suitable for synchronizing the ascending / descending positions of the pair of telescopic struts.

For example, a technique described in Patent Document 1 is known as a portal lifter that can suspend a conveyed object and convey it.
This type of portal lifter has a pair of carts 2 and 2 that are spaced apart from each other, for example, like a portal lifter 100 shown in FIG. On each carriage 2, 2, a pair of telescopic columns 3, 3 that can be expanded and contracted up and down are erected. Further, a cross beam portion 4 is stretched over the pair of telescopic columns 3 and 3. Further, the pair of carriages 2 and 2 are equipped with drive units 110 and 110, respectively.

  These two drive units 110 and 110 have, as a power unit, a motor 12 and a hydraulic pump 13 driven by the motor, for example, as illustrated in FIG. An electromagnetic valve 11 is interposed between the hydraulic cylinder 8 and the hydraulic pump 13 for expanding and contracting the telescopic column 3, and each of the drive units 110 and 110 includes control units 114 and 114, respectively. The control units 114 and 114 are connected to the electromagnetic valve 11 and the motor 12 via signal lines 16 and 17, respectively. Further, each of the control units 114 and 114 is connected to the wired controller 7A via the signal line 18, and each of the control units 114 and 114 is connected to the receiver via the signal line 19. 15, the necessary signal can be exchanged with the wireless operation device 7B. As a result, when an operation signal from the operator is input to the control unit 114 from the wired operation unit 7A or the wireless operation unit 7B, the control units 114 and 114 are configured according to the input operation signal. The telescopic struts 3 and 3 can be individually expanded and contracted by controlling the motors 12 and 12 and appropriately opening and closing the electromagnetic valves 11 and 11 and individually expanding and contracting the hydraulic cylinders 8 and 8. . Then, by lifting and lowering the pair of left and right telescopic struts 3 and 3 respectively, the article to be transported H can be suspended and transported to the horizontal beam portion 4 connecting the left and right telescopic struts 3 and 3.

By the way, in this type of portal lifter, when a pair of left and right telescopic support columns are vertically expanded and contracted, if there is a difference in the left and right elevating positions, an unintended inclination is generated in the cross beam portion connecting the two. Accordingly, various techniques for preventing the unintended inclination of the cross beam portion by synchronizing the left and right expansion / contraction amounts have been proposed (see, for example, Patent Document 2).
For example, the technique described in Patent Document 2 is not applied to the portal lifter described above, but is based on stroke sensors provided in a plurality of hydraulic cylinders for extending and contracting vertically and detection signals from the respective stroke sensors. Thus, by providing a controller that individually controls the strokes of the plurality of hydraulic cylinders, the expansion and contraction amounts of the plurality of hydraulic cylinders are synchronized.
JP 2004-307136 A JP 2004-35138 A

  However, in the technique described in Patent Document 2, for example, a plurality of hydraulic cylinders are provided with stroke sensors. Therefore, when this is applied to the technique described in Patent Document 1, for example, each of the pair of left and right telescopic struts, That is, two stroke sensors are required. Further, a controller for controlling the amount of expansion / contraction of the mutual expansion / contraction struts based on the detection signals from these two stroke sensors is required. For this reason, a plurality of sensors are required, and a controller and a program for tuning control corresponding to the plurality of sensors are also required. Therefore, there is a problem that the configuration of the apparatus is complicated and the cost is increased accordingly.

  Therefore, the present invention has been made paying attention to such problems, and an object of the present invention is to provide a portal lifter that can synchronize the ascending / descending positions of a pair of left and right telescopic struts with a single sensor.

  In order to solve the above-described problems, the present invention provides a pair of carts that are spaced apart from each other on the left and right, a pair of telescopic columns that are provided on each cart and can be expanded and contracted vertically, and the pair of telescopic columns. A horizontal beam section that is stretched over the top of each of the two carriages, and two drive units that are provided on each of the pair of carts and individually extend and contract each of the telescopic struts. A gate type lifter capable of transporting the same, further comprising an inclination detecting means for detecting an inclination of one of the pair of telescopic struts, the one telescopic strut of the two drive units. Based on the tilt detection signal of the tilt detecting means, the drive unit corresponding to 1 moves up and down the one telescopic column so that the tilt becomes small, and the drive unit corresponding to the other telescopic column supports the operator's operation signal. It is characterized by being configured to raise and lower the other telescopic strut in accordance with the.

  According to the portal type lifter according to the present invention, since it has the inclination detecting means for detecting the inclination of one of the pair of telescopic struts, the inclination of the telescopic strut on the side having the inclination detecting means can be detected. Can do. The other telescopic strut of the pair of telescopic struts is configured to move up and down in response to an operator operation signal. At this time, one telescopic strut is based on the tilt detection signal of the tilt detecting means. Then, the drive unit corresponding to one of the telescopic struts is operated so that the inclination becomes small, and the one telescopic strut is moved up and down. The elevating position of the telescopic strut can be positioned so that the inclination becomes small. That is, it is possible to synchronize the ascending / descending positions of the pair of left and right telescopic struts with one sensor.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. 1A and 1B are diagrams for explaining an embodiment of a gate type lifter according to the present invention. FIG. 1A is a front view thereof, and FIG. 1B is a left side view thereof. FIG. 2 is a view for explaining a drive unit of the portal lifter shown in FIG. In addition, the same code | symbol is attached | subjected about the structure similar to the conventional portal lifter illustrated above.

The portal lifter 1 shown in FIG. 1 lifts and lowers a pair of left and right telescopic columns 3A and 3B, and hangs a transported object H with a hanging tool 6 on a horizontal beam portion 4 connecting the left and right telescopic columns 3A and 3B. This can be conveyed.
Specifically, the portal lifter 1 has a pair of carts 2 and 2 that are spaced apart from each other as shown in FIG. Two wheels 9 having large casters are provided in front and behind the lower portions of the carriages 2 and 2, respectively, so that they can move in a desired direction in accordance with pushing and pulling by the operator. A pair of telescopic columns 3A and 3B are erected on each carriage 2 and 2, respectively. The pair of telescopic struts 3A and 3B includes a plurality of cylindrical pillars that fit in a telescope shape, and a hydraulic cylinder (described later) provided therein, and the hydraulic cylinder is expanded and contracted. It is possible to expand and contract vertically.

  Further, a horizontal beam portion 4 is stretched over the pair of telescopic columns 3A and 3B, and the left and right elastic columns 3A and 3B are connected to each other by the horizontal beam unit 4. Furthermore, drive units 10A and 10B are mounted on the pair of carriages 2 and 2, respectively. These two drive units 10A and 10B are provided corresponding to the respective telescopic struts 3A and 3B so that the left and right telescopic struts 3A and 3B and the lateral beam portion 4 can be easily disassembled and assembled on site. The telescopic struts 3A and 3B are individually expanded and contracted. That is, in order to improve disassembly and assembling on site, there is no hydraulic piping or electrical wiring between the left and right telescopic columns 3A, 3B. Each of the carts 2 and 2 is provided with a detachable auxiliary wheel 9a extending to the left and right. When the car is disassembled or assembled on the site, the carts 2 and 2 are overturned. Is prevented (see FIG. 5A).

  Here, of the drive units 10A and 10B, the level unit 5 is provided in the left drive unit 10B in FIG. This level 5 is an inclination detecting means for detecting the inclination of one of the pair of telescopic struts 3A, 3B (left side in FIG. 5A). An inclination detection signal proportional to the amount of inclination of the telescopic column 3B can be output. The detected inclination detection signal is input to a control unit in the drive unit 10B corresponding to the one telescopic column 3B (hereinafter also referred to as “left telescopic column”). Note that the level 5 is not provided on the other telescopic column 3A (hereinafter also referred to as “right telescopic column”).

  Specifically, as shown in FIG. 2, the two drive units 10A and 10B include a motor 12 and a hydraulic pump 13 driven by the motor as a power unit. The discharge side of the hydraulic pump 13 is connected to the hydraulic cylinder 8 via the electromagnetic valve 11. The hydraulic cylinder 8 is a hydraulic cylinder for expanding and contracting each of the telescopic columns 3A and 3B. Furthermore, each drive unit 10A, 10B is provided with the control part 14A and the control part 14B, respectively. The control units 14A and 14B are connected to the electromagnetic valve 11 and the motor 12 via signal lines 16 and 17, respectively. Further, a power source (AC 100V) is connected to these control units 14A and 14B, and necessary power can be supplied to each unit.

  Here, among these control units 14A and 14B, the control unit 14A in the drive unit 10A is connected to the wired controller 7A and the receiver 15 via the signal lines 18 and 19, respectively. 15 can exchange necessary signals with the wireless operation device 7B. As a result, when an operation signal from the operator is input from the operating device 7A to the operating device 7B, the control unit 14A drives the motor 12 in the power unit according to the input operation signal, and the electromagnetic valve 11 The right telescopic support column 3A is expanded and contracted by appropriately opening and closing the oil passage and expanding and contracting the hydraulic cylinder 8.

  On the other hand, an operation signal from the operator is not input to the control unit 14B in the drive unit 10B. The tilt detection signal detected by the level 5 is input to the control unit 14B. When the tilt detection signal is input, the control unit 14B drives the motor 12 in the power unit and, based on the tilt detection signal input from the level 5, the electromagnetic wave is reduced so that the tilt is reduced. The valve 11 is appropriately opened and closed to expand and contract the hydraulic cylinder 8 to expand and contract the left telescopic column 3B. Here, a predetermined threshold is set for the absolute value of the tilt detection signal in the control unit 14B, and when the input tilt detection signal is within the threshold, the expansion / contraction operation of the hydraulic cylinder 8 is stopped. When the value of the tilt detection signal exceeds the threshold value and is negative, the hydraulic cylinder 8 is expanded, and when the value of the tilt detection signal exceeds the threshold value and is positive, the hydraulic cylinder 8 is shortened. Yes.

Next, functions and effects of the portal lifter 1 will be described.
As described above, the portal lifter 1 lifts and lowers the pair of left and right telescopic support columns 3A and 3B, respectively, so that the object to be transported H is attached to the horizontal beam part 4 connecting the left and right telescopic support columns 3A and 3B by the lifting tool 6. The transported object H can be transported by hanging and moving the carts 2 and 2 in a desired direction in response to the operator pushing and pulling the pair of carts 2 and 2.

  Here, when the portal lifter 1 raises the pair of left and right telescopic struts 3A and 3B, respectively, as shown in FIG. 3A, for example, the operator first sends an operation signal in the upward direction to the drive unit 10A. Entered. As a result, the right telescopic strut 3A extends in accordance with the operation signal (reference numeral U1 in the figure), and the right side of the horizontal beam part 4 becomes higher. Therefore, the horizontal beam portion 4 is inclined leftward by the symbol θ1 in FIG. At this time, the level 5 on the left telescopic column 3B side detects a negative inclination corresponding to the inclination θ1, and outputs the inclination detection signal to the control unit 14B. The controller 14B in the drive unit 10B drives the motor 12 in the power unit when a negative inclination detection signal is input that exceeds the threshold value, and the inclination based on the input inclination detection signal. As shown in FIG. 3B, the hydraulic cylinder 8 of the left telescopic column 3B is extended until the tilt detection signal is within the threshold value (see FIG. 3B). Symbol U2). Thereby, as shown in the figure, the inclination of the cross beam portion 4 is corrected and corrected to the horizontal state.

  Further, according to the portal lifter 1, when the pair of left and right telescopic columns 3A and 3B are lowered, for example, as shown in FIG. Is input. Thereby, the right telescopic support 3A is shortened according to the operation signal (reference numeral D1 in the figure), and the left side of the horizontal beam part 4 becomes higher. For this reason, the horizontal beam portion 4 is inclined to the right by the symbol θ2 in FIG. At this time, the level 5 on the left telescopic column 3B side detects a positive inclination corresponding to the inclination θ2, and outputs the inclination detection signal to the control unit 14B. Then, when the control unit 14B in the drive unit 10B exceeds the threshold and a positive inclination detection signal is input, the control unit 14B drives the motor 12 in the power unit, and the inclination based on the input inclination detection signal. As shown in FIG. 4B, the hydraulic cylinder 8 of the left telescopic strut 3B is shortened until the tilt detection signal is within the threshold value (see FIG. 4B). Symbol D2). Thereby, as shown in the figure, the inclination of the cross beam portion 4 is corrected and corrected to the horizontal state.

  That is, according to the portal lifter 1, the drive unit 10 </ b> A corresponding to the right telescopic column 3 </ b> A of the pair of telescopic columns 3 </ b> A and 3 </ b> B is moved up and down only in response to an operator operation signal. In this case, the portal lifter 1 has a level 5 for detecting the inclination of the left telescopic support column 3B. Therefore, the inclination of the left telescopic support column 3B can be detected. Then, the drive unit 10B corresponding to the left telescopic column 3B raises and lowers the left telescopic column 3B so that the inclination becomes small based on the tilt detection signal of the level 5, so that the right telescopic column 3A moves up and down. When the left telescopic strut 3B is tilted, the lift positions of the left and right telescopic struts 3A and 3B can be positioned so that the tilt of the cross beam portion 4 becomes small. That is, the raising / lowering positions of the pair of left and right telescopic columns 3A and 3B can be synchronized with one sensor (level 5).

  Further, according to the portal lifter 1, the drive unit 10B is configured to move the left telescopic column 3B up and down based on the tilt detection signal of one level 5, so that for example, for tuning control corresponding to a plurality of sensors Compared to a configuration including a controller, a program, and the like, the configuration of the apparatus is relatively simple, and the cost can be reduced accordingly. Further, since the drive unit 10B operates following the operation of the drive unit 10A according to the operation signal of the operator, the circuit and the receiver 15 for dealing with the operation devices 7A and 7B are unnecessary, and the device correspondingly Can be simplified and configured at a lower cost.

  Further, for example, in the technique described in Patent Document 2 described above, since the lifting amount is synchronized using a stroke sensor, when this is applied to the left and right telescopic struts of this type of portal lifter, the horizontal beam portion is actually used. Does not stay level. That is, if the ground is an inclined surface, the horizontal beam portion is also inclined according to the inclination. Therefore, in a portal lifter that hangs the object to be conveyed and conveys it, the object to be conveyed is suspended in the direction of gravity even if the lifting amounts of the left and right columns are synchronized using the stroke sensor. The to-be-conveyed object inclines according to the inclination of the ground. Therefore, if the amount of inclination is large, for example, there is a risk of contact with either the left or right struts, or the hanging tool slips sideways, causing load displacement.

  On the other hand, according to the portal lifter 1 according to the present invention, the drive unit 10B corresponding to the one telescopic support column 3B is operated based on the inclination detection signal of the level 5 so that the inclination becomes small. Thus, the one telescopic column 3B moves up and down, so that the relative lifting position of the left and right telescopic columns 3A and 3B can be synchronized with the inclination of the cross beam portion 4 itself. Therefore, there is also an effect that the inclination of the horizontal beam portion 4 itself can be configured to be kept horizontal according to the state on the ground. With such a configuration, even when the transported object H is suspended and transported, the suspended transported object H is suspended almost directly below regardless of the inclination on the ground. Can do. Therefore, for example, there is no concern that the left and right telescopic support columns 3A and 3B may come into contact with each other, or that the hanging tool 6 slides sideways and a load shift occurs.

It should be noted that the portal lifter according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, an example in which a level is used as the inclination detection means for detecting the inclination of one of the pair of expansion / contraction struts 3A and 3B has been described. Any means can be used as long as the means can detect the inclination of one of the telescopic columns.

It is a figure explaining one embodiment of the portal type lifter concerning the present invention, the figure (a) is the front view, and the figure (b) is the left view. It is a figure explaining the drive unit of the portal lifter shown in FIG. It is a figure explaining the operation | movement of the portal lifter shown in FIG. It is a figure explaining the operation | movement of the portal lifter shown in FIG. It is a figure explaining an example of the conventional portal lifter, The figure (a) is the front view, The figure (b) is the left view. It is a figure explaining an example of the drive unit of the conventional portal lifter shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gate type lifter 2 Carriage 3A, 3B Telescopic support | pillar 4 Cross beam part 5 Level (tilt detection means)
6 Lifting tool 7A, 7B Controller 8 Elevating cylinder 9 Wheel 10A, 10B Drive unit 11 Solenoid valve 12 Motor 13 Pump 14A, 14B Control unit 15 Receiver 16, 17, 18, 19 Signal line H Transported object

Claims (1)

A pair of carts that are spaced apart from each other on the left and right, a pair of telescopic columns that are erected on each cart and can be expanded vertically, and a horizontal beam section that is stretched over the pair of telescopic columns and connects each other And a pair of drive units provided on each of the pair of carriages for individually extending and retracting each of the telescopic struts. ,
Of the pair of telescopic struts, further comprising a tilt detecting means for detecting the tilt of one telescopic strut,
Of the two drive units, the drive unit corresponding to the one telescopic strut raises or lowers the one telescopic strut so that the tilt becomes small based on the tilt detection signal of the tilt detecting means, The gate type lifter characterized in that the drive unit corresponding to the telescopic column is configured to move the other telescopic column up and down in response to an operation signal from the operator.

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