JPS60258092A - Lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevating device capable of lifting personnel, needle materials, etc. to a high place by moving an elevating platform upward and downward above a vehicle body. The present invention relates to an elevating device that can move an elevating platform up and down in a direction perpendicular to a vehicle body by adjusting the angle.

Assembly at imperial places such as highways and pill buildings.

For painting and repair work, a lifting device that raises and lowers a lifting platform is often used.
The aircraft was lowered for work. In this conventional lifting device, a pair of arms are pivoted at the center to form a set.
Move multiple sets of arms up and down.

A pantograph-like extension mechanism is used that is connected in both directions (so-called scissor type), and in order to avoid the maximum lifting height of the lifting device, the length of each arm must be lengthened or the length of the connected arms must be increased. This required a large number of groups.

For this reason, if you design a lifting device that can control the lifting height, you will have to use multiple sets of pantographs.
The height of the elevating device when the structure is folded is high, making it cumbersome for workers to get on and off the elevating platform and to load and unload materials. For this reason, an elevating mechanism has been devised in which a plurality of booms are telescopically inserted into the inside of the arm so that one arm can extend in its length direction (for example, No. 134487,
(Special Application No. 191065 of 1982, etc.) In this newly proposed lifting mechanism, two sets of booms are combined in a KX shape that can rotate freely at the center, two sets of boom bodies are arranged in parallel, and four upper and lower arms are used to lift and lower the vehicle body. The tables were connected. For this reason, the number of booms required increases, the number of component parts is extremely large, the manufacturing and assembly becomes complicated, and the price becomes high. In addition, the number of sliding parts between the boom and arm is extremely large, and since sliding parts such as MC nylon are usually attached to these sliding points, the number of parts that must be replaced regularly increases.

Inspection and maintenance were expensive and the work was troublesome. For this reason, a single telescopic boom body is interposed between the vehicle body and the lifting platform, and the vehicle body, the lifting platform, and the telescopic boom body form a two-shape structure. An elevating device has also been proposed in which a correcting means is interposed between the two, and the elevating platform can be corrected to be horizontal by the correcting means. However, with this configuration, if the actuating means for extending and retracting the telescopic boom body and the correcting means operate separately, the amount of movement of both will not be synchronized, and the lifting platform will not necessarily be able to move up and down in the vertical direction with respect to the vehicle body. First, it was difficult to move the lifting platform to the target position.

In view of the above-mentioned drawbacks, the present invention provides a method in which a linear reference body is stretched between the lifting platform and the vehicle body, and the inclination angle of this reference body is detected to control the operation of the actuation means and the correction means. To provide an elevating device that can constantly move an elevating platform vertically up and down with respect to a vehicle body. 1) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

A front wheel 2 and a rear wheel 3 are pivotally supported on the front, rear, left and right sides of the vehicle body 1, so that the vehicle body 1 can move freely.
A power supply box 4 containing an engine, a hydraulic pump, etc. is attached to the lower part of the vehicle body 1. A pair of shaft support pieces 5 are fixed to one end of the upper surface of the vehicle body 1 at intervals, and the shaft support pieces 5
A hollow lower row boom 6 with a rectangular cross section is inserted between them, and the shaft support piece 5 and the lower row boom 6 are rotatably connected by a pin 7. A pair of pins 8 are fixed to the left and right sides of the upper surface of the vehicle body 1 at positions opposite to the shaft support pieces 5, and between these pins 8 and the outside of the lower row boom 6, there is a A hydraulic cylinder 9 is interposed. The tip of the lower row boom 6 has a rectangular opening, and an internal hollow poom 1o having a square cross section is slidably inserted into this opening, and a hollow poom 1o having a square cross section is inserted from the tip opening of the middle boom 1o. The hollow end poom 11 is slidably inserted therethrough. The tip of the tip boom 11 is inserted into an internally hollow lifting boom 12 having a rectangular cross section. Equally spaced gaps are formed between the outer booms 12. This upper and lower row boom 6.
12 are each set to have a length about half of the length of the car body 1, and the middle boom 10 and the front boom 11 are each set to have a length of about half the length of the car body 1.
It is set to approximately the same length as the length of the lower row pool 6,
Medium pool 10. Ahead boom 11. A telescopic boom body 13 is formed by the rising boom 12 . The code 16 is the vehicle body 1 and t-z)! It is a flat platform with the same floor area,
A pair of shaft support pieces 14 are fixed to one end of the lower surface of this lifting platform 16 at intervals, and a lifting boom 12 is inserted between both shaft support pieces 14. are rotatably connected to each other by a pin 15. In addition, on both sides of the lower surface of the lifting platform 16 at a position opposite to the shaft support piece 14.

A pair of pins 17 are fixed to each, and a hydraulic cylinder 18 is interposed between each pin 17 and both sides of the upper pool 12. A handrail 19 is installed around the top of the platform 16. It is set up.

In addition, a three-dimensional detection body 40 is fixed on one side of the upper surface of the vehicle body 1 opposite to the shaft support piece 5, and a hook 41 is provided at a position corresponding to the detection body 40 on the lower surface of the elevator platform 16. is fixed. One end of a wire 42 that serves as a vertical reference is connected to this hook 41. The other end of this wire 42 is wound inside the detection body 40 and is always pulled with a constant tension so that it becomes vertical. Retained.

FIG. 5 is a sectional view showing the inside of the telescopic boom body 13. Both the lower row of pools 6 and the rising pool 12 have a rectangular cross section and a pipe shape with one end closed. A pipe-shaped inner boom 10 with a rectangular cross section and an outer circumference slightly smaller than the inner circumference of each outer boom 6.12 is slidably inserted into the inner boom lO.
Inside, a pipe-shaped tip poom 11 whose outer circumference is slightly smaller than the inner circumference of the middle boom 10 is slidably inserted into the middle boom 10.
2 is connected and fixed with a screw 20VC at its upper end. The inside of the tip boom 11 is hollow over its entire length, and a hydraulic cylinder 21 is housed inside the tip boom 11 parallel to its length, and the base of the hydraulic cylinder 21 is fixed to the lower outer boom 6. An adapter 23 is fixed perpendicularly to the cylinder rod 22 of the hydraulic cylinder 21, and a rod 24 is fixed to the adapter 23&C so as to be parallel to the hydraulic cylinder 21. The lower end of the middle pool 10 is connected. Further, a hydraulic cylinder 26 is housed inside the front boom 11, and the base of this hydraulic cylinder 26 is fixed to a block 27 fixed to the lower end of the middle boom 10. pulley 29
A wire 30 is wound around this pulley 29, one end of which is connected to the hydraulic cylinder 26 and the other end connected to the lower end of the tip boom 11. Next, the destination pool 1
A rectangular frame-shaped spacer 31 whose outer diameter is approximately the same shape as the inner periphery of the ascending boom 12 and whose inner periphery is approximately the same shape as the outer periphery of the tip boom 11 is slidably inserted into the outer periphery of the boom 1. Yes, this S・L, Pacer-31 has a middle boom 10
Always keep in contact with the tip of the B Next, FIGS. 6 and 7 show the mutual relationship between the tip of the lifting boom 12 of the intermediate pool 10 and the spacer 31.
A frame-shaped slider 32 whose shape is almost the same as the inner circumference of the slider 32 is fixed thereto, and concave notches 33 are machined in the center of each of the four outer circumferences of the slider 32. A locking pin 34 is protruded from the center of each side of the inner circumference near the lower end of the lifting boom 12 at a height that does not contact the intermediate pool 10.

Next, FIG. 8 shows the internal configuration of the detection body 40 f,
A support shaft 43 is horizontally supported inside, and this support shaft 43
A drum 44 is fixed to the drum 44, the wire 42 is wound around the drum 44, and a tensioner 45 is installed at the end of the support shaft 43, storing a spring or the like to always bias the support shaft 43 in the X direction.
is connected.

This wire 42 is drawn upward from the outer periphery of the drum 44, and push switches 46 and 47 are arranged at intervals on the left and right sides of the wire 42, respectively.
1. The rollers 50 and 51, which are pivotally supported by the levers 48 and 49 of each limit switch 46 and 47, are opposed to the wire 42 with a slight spacing therebetween.

FIG. 9 shows the hydraulic system of this embodiment, in which the engine 60
The suction side of the pump 61 driven by the pump 61 is connected to a tank 62, and the discharge side thereof is connected to a switching valve 63. Hydraulic cylinders 9 and 18 and hydraulic cylinders 21 and 26 are connected to this switching valve 63 via electromagnetic valves 64 and 65, respectively, and a limit switch 46 is connected to the electromagnetic valve 64 via a controller 67. The limit switch 47 is connected via the controller 68 to the lightning magnetic valve 65VC.

Next, the operation of this embodiment will be explained.

Figures 2 and 3 show the state in which the telescopic boom body 13 is reduced and the lifting platform 16 is lowered to the lowest position.

In this state, a worker gets on the lifting platform 16, materials are placed thereon, and the lifting platform 16 is raised. To raise the lifting platform 16, the engine 60 in the power source box 4 is operated to generate zero oil pressure from the pump 61, and each hydraulic cylinder 9,
This is done by supplying hydraulic pressure to 1g and 21.26, respectively. When hydraulic pressure is supplied to the hydraulic cylinders 21.26, the cylinder rods 22.28 extend and slide the middle pool 10 out of the lower boom 6, and also slide the tip pool 11 out of the middle boom 10. Move and pull out to increase the spacing between pins 7.15. Furthermore, the extension of the hydraulic cylinder 9 rotates the lower row poom 6 about the pin 7, and lifts the telescopic boom body 13 so as to tilt it with respect to the vehicle body IVc.

Further, due to the extension force of the hydraulic cylinder 18, the lifting platform 16 rotates around the pin 15, and the upper wide pool 12 and the lifting platform 1G are rotated.
hydraulic cylinders 9 and 18.
By synchronizing the amount of extension of the vehicle body 1, the lifting platform 16 becomes parallel to the vehicle body 1. Telescopic boom body 13. The lifting platform 16 is formed into a two-letter shape when viewed from the side. Once the lifting platform 16 has risen to a predetermined height position, the operator stops the operation of each hydraulic cylinder 9, 18, 21, and 26, and the lifting platform 16 is held at that height position 4. assembly.

Osamu 9. Effects such as painting can be performed. When the telescopic boom body 13 is extended by the aforementioned hydraulic cylinders 21 and 26, the middle boom 10 is not pulled out from the tip poom 11 and the rising poom 12 by the hydraulic cylinder 26, and at the same time, the spacer 31 also slides on the outer periphery of the tip poom 11. Medium boom 10
It is pulled out while following the tip pressure. During this movement of the middle boom 10 and the spacer 31, when the tip of the middle boom 10 reaches near the lower end of the rising boom 12, the locking pin 34 passes through the notch 33 of the slider 32, and the tip of the middle boom 10 reaches the bottom of the rising boom 12. Still moving downward from the bottom edge of . However, the spacer 31 is attached to the locking pin 12, and the spacer 31 remains held inside the lower part of the lifting boom 12. For this reason, the spacer 31
is located between the lifting boom 12 and the front boom 11, and fills the space after the middle boom 10 has been pulled out. Prevents the space from being compressed by 1 degree due to stress.

The aforementioned hydraulic cylinders 9.1g, 21.26 are actuated by the switching valve 63, and when the switching valve 63 is set to the normal or reverse position, the hydraulic pressure passes through the electromagnetic valve 64.65 and flows into the hydraulic cylinders 9.18. 21.26, but
This state is limited to when the wire 42 is perpendicular to the vehicle body 1.

Group of hydraulic cylinders 9.18 and hydraulic cylinders 21.
If the hydraulic pressure supply amounts in the groups 26 and 26 are not proportional, and the amount of extension of the telescopic boom body 13 and the angle of the vehicle body 1 in the telescopic boom body 13 are not appropriate, the lifting platform 16 will be deviated in the horizontal direction with respect to the vehicle body 1. It will rise. When the lifting platform 16 is deflected, the wire 42 is inclined with respect to the vehicle body 1, and when it comes into contact with one of the rollers 50.51, the corresponding switch 46.47 is actuated, and the controller 67. Operate one of the solenoid valves 64.65 to temporarily cut off the circuit and press the hydraulic cylinder 9.18 or 21.26.
stop the extension operation. When one of these operations is stopped, the telescopic boom body 13 extends its entire length or expands its angle with respect to the vehicle body 1, corrects the operational error due to insufficient oil pressure supply, and the wire 42 moves vertically to the vehicle body IK. One hydraulic cylinder 9.18.21.26 is stopped until . When the wire 42 becomes perpendicular to the vehicle body 1 and none of the limit switches 46, 47 operate, the initial state returns and each hydraulic cylinder 9, 18, 21
．． 26 is operated by being supplied with hydraulic pressure.

Further, in order to lower the elevator platform 16, the switching valve 63 is operated in the opposite direction, and each hydraulic cylinder 9, 18,
When 21.26 is reduced, contrary to the above, the length of the telescopic boom body 13 is reduced, the angle of inclination between the vehicle body and the telescopic boom body 13 becomes gentler, and the elevator platform 16 becomes parallel to and perpendicular to the vehicle body 1. and descend.

Since the present invention is configured as described above, the lifting platform can be moved up and down using only one telescopic boom body for lifting and lowering, and the deviation of the lifting platform can be detected and corrected using the reference body. Therefore, the platform can always rise perpendicularly to the vehicle body.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a side view showing the elevating platform lowered to the lowest position, Fig. 3 is a front view of the same, and Fig. 4 is the elevating platform shown in the lowermost position. FIG. 5 is a side sectional view of the telescopic boom body; FIG. 6 is a partial perspective view showing the vicinity of the lower end of the upper row boom; FIG. 7 is a partially enlarged view of the same as above; FIG. The figure is an exploded perspective view showing the internal structure of the detection body, and FIG. 9 is a circuit diagram showing piping of the hydraulic system. 1... Vehicle body, 6... Lower row boom, 10... Middle boom, 11... Front boom, 12... Rising boom, 1
6... Lifting platform, 40... Sensing object, 42... Wire, 46.47... Limit switch. Patent Applicant Hikoma Seisakusho Co., Ltd. Patent Attorney Tsuneaki Hibi Figure 2 19 Figure 3

Claims (1)

[Claims] A movable vehicle body, a flat lifting platform placed above the vehicle body, a telescoping boom body placed between the vehicle body and the lifting platform, which is extendable and retractable by inserting multiple booms in its length direction, and Hydraulic actuating means that is housed in the boom body and performs telescoping operations; Hydraulic correction means that is interposed between the vehicle body and the telescoping boom body and between the telescoping boom body and the elevating platform to maintain the elevating platform horizontal at all times; , consists of a linear reference body that is constantly stretched between the vehicle body and the lifting platform, and a displacement detection means that is fixed on the vehicle body and detects the inclination direction of the reference body. At the same time as the boom is extended and retracted, the vehicle body, the telescopic boom body, and the lifting platform are corrected so that they form a double-shape, and the lifting platform is raised horizontally.The displacement detection means detects the inclination angle of the reference body, and the hydraulic work means or An elevating device that can correct any of the hydraulic correction means so that the elevating platform rises in a direction perpendicular to the vehicle body.