JPS5863696A - Hoist with load change following device - 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 a hoist equipped with a load change follower tube that raises and lowers a load using pressure from a liquid or gaseous fluid.

Hoist Co., Ltd. according to a separate application filed by the applicant (same inventor) K;
The pressure change in the detection cylinder caused by the load or the force applied to the device body is detected by the detection pulp, and the pressure change is sent from the detection pulp as a pressure signal to the main valve, and the main valve sends a signal to the main valve. A fluid having a pressure corresponding to the pressure signal is sent into or out of the drive cylinder to lift the load by the drive cylinder and to raise and lower the load. However, this device has the inconvenience of having to hold the device body or the detection cylinder and move the device body or detection cylinder up and down when raising or lowering the load. . With the above device, if you apply force upwards with a line load, the pressure inside the detection cylinder will decrease, and if you apply force downwards, the pressure in the detection cylinder will increase, and as a result, the pressure will increase upwards. This is because when force is applied, the load descends, and when force is applied downward, it becomes difficult to move the load up and down.The present invention solves the problems of the hoist explained above. The purpose of this invention is to provide a hoist equipped with a load change tracking device that allows the load to be moved down one level easily and quickly while holding the load. There is K.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to FIG.

The drawing is a sectional view of an embodiment of a hoist equipped with a load change following device 1t according to the present invention. be. 4 is a piston fitted into the drive cylinder 2, and a piston rod fixed to the sFi piston 4, the tip of which is connected to a connecting part 7 of the ceiling part 6. Thereby, the main body l of the device is supported. In this case, a truck or the like may be attached to the tip of the piston rod 5 to press it so that it runs on a rail provided on the ceiling 6. Next, the load change follower provided in the detection cylinder 3, which is the main part of the present invention, will be explained. 8 is a piston fitted in the detection cylinder 3, and the central part Kd hole 8' is have 9
is a small-diameter piston rod inserted into the hole 8' of the piston 8; a spring 11 is fixed to the lower part of the upper end 10 of the rod; Therefore, the small diameter piston rod 9 is the piston 8
It will slide up and down against the spring lit. Reference numeral 12 denotes a large-diameter piston rod having a sufficiently larger cross-sectional area than the small-diameter piston rod 9 which is connected to the small-diameter piston rod 9, and extends outward from the inner lower part of the detection cylinder/stop 3, and has an engaging member at its lower end. A stop portion 13 is provided. 14 is a sedge ring fixed at both ends between the detection cylinder 30 case and the locking part 13, and the urging force of this sedge ring 14 causes the detection cylinder 2 to
Preload is always applied inside. Further, the locking portion 13 is provided with a suitable connecting member 15 such as a hook, and a load 16 is applied thereto. In addition, reference number 17 detects the pressure inside the detection cylinder 3 and sends the pressure signal, 1.
8 receives a pressure signal from the detection pulp 17 and sends a liquid or gaseous fluid pipe into the driving cylinder 2 at a pressure corresponding to the difference between the pressure signal and the pressure inside the driving cylinder 2 or from inside the driving cylinder 2. Main valve for drive cylinder for pumping,
19 expansion force source.

Now, the operation of the hoist configured as above will be explained.

First, the connector 15 is applied to the load 16. Next, hold the outer case part of the device main body 10 by hand or apply some arbitrary i (W) upward using a mechanical lever or the like. At this time, the relationship between the load 160 (w) and the force (w) is W>w
If this is the case, even if force (W) t- is applied, the load 16a will not be lifted, but a pressure corresponding to one force (W) will be applied inside the detection cylinder 3. At the same time, the pressure is detected by the detection pulp 17, and the detection pulp 17 further sends the detected pressure signal to the main valve 18 for the drive cylinder. Then, the main valve 18 sends fluid at a pressure corresponding to the pressure signal from the pressure source 19 into the drive cylinder 2. As a result, a pressure corresponding to the force CW'') is applied to the drive cylinder 2. Therefore, an upward force (W) is applied to the load 16. Also, at this time, a force (W) in the upward direction acts on the load 16. It goes without saying that the pressure corresponding to the downward force (W) K from the load 16 is maintained. Therefore, if you repeatedly apply an upward force (W) to the device main body IK, the number of repetitions (N) will increase. This means that a proportional force Nw acts upward, and if the operation is performed until the above operation tW-Nf is reached, the load 16 and the pressure inside the drive cylinder 2 can be balanced t.

Next, the operation for raising and lowering the load 16 after the load 16 and the pressure of the drive cylinder 2 are brought into equilibrium as described above will be described. Now with load 16, load 1
When a downward force tube is applied to 6, the small-diameter piston rod 9 and the large-diameter piston rod 12 each move in the downward direction due to the deflection of the suge ring 11. At this time, the volume within the detection cylinder 3 increases by the difference in cross-sectional area between the small-diameter piston rod 9 and the large-diameter piston rod 12 x the above-mentioned movement amount, so the pressure within the detection cylinder 3 decreases. At the same time, since the change in pressure is detected by the detection pulp 17, the fluid with the pressure corresponding to the change (decrease) flows out from the drive cylinder 2. Therefore,
The balance is broken and the load 16 falls until the pressure within the drive cylinder 2 is again in equilibrium with the load 16. In addition, in the above operation, the downward force against the load 16 is applied to the outer case portion of the device main body l via the spring 14).
The outer case of the device main body 1 is pulled downward, and this action also reduces the pressure inside the detection cylinder 3, making it possible to move the load 16 downward more quickly and easily.

Furthermore, when a force is applied upward with the load 16, the small diameter piston rod 9 and the large diameter piston rod 12 move upward due to the tension of the Suge ring 11, so the detection cylinder 3
The volume of the interior 3' of is reduced by the difference in cross-sectional area between the small-diameter piston rod 9 and the large-diameter piston rod 12 times the amount of movement. Therefore, the pressure within the detection cylinder 3 increases, and fluid corresponding to the increased pressure flows into the drive cylinder 2 via the main valve 18tl. As a result, the pressure inside the drive cylinder 2 increases and the equilibrium with the load 16 is lost, so the pressure inside the drive cylinder 2 2' increases by the amount of inflow of the fluid, and that pressure becomes the load 16. It is lifted upward until it reaches equilibrium again. Also, in this case, the upward force against the load 16 pushes up the outer case portion of the device main body 1 through the spring 14, but this action also increases the pressure inside the detection cylinder 3, so the load 16 Upward movement is much faster and easier. In the above explanation, it goes without saying that the amount of rise and fall of the load 16 can be freely adjusted depending on the magnitude of the force applied to the load 16.In addition, in the above description, the present invention is applied to a cylinder hoist as an example. For example, in a device that converts the thrust of a drive cylinder into rotational force and moves a load up and down by winding and unwinding a wire, a main body is attached to the tip of the wire. If only the detection cylinder of the invention is installed and the pressure change in the second detection cylinder is transmitted to the drive cylinder via the detection pulp and the main valve, it is possible to obtain a device that operates in the same manner as described above. . Furthermore, even if a pendulum type load balance hoist is used, the device using the pressure of the present invention can be installed in the conventional cylinder part.

Since the present invention is constructed and operates as described above, it provides excellent effects as described below.

Compared to the previous operation in which the load was moved up and down by holding the hoist body or the detection cylinder and moving it up and down, it is now possible to move the load up and down while holding the hoist and moving it up and down quickly and easily. This makes it possible to make significant improvements in work.

[Brief explanation of the drawing]

The figure is a diagram showing one embodiment of the present invention. Here 1,
DESCRIPTION OF SYMBOLS 1... Device main body, 2... Drive cylinder, 3... Detection cylinder, 4.8... Piston, 5... Piston rod, 9... Small diameter piston rod, 11.14... Spring, 12... Large diameter piston rod, 16... Load, 1
7...Detection pulp, 18-Main valve for drive cylinder.

Claims (1)

[Claims] α) The detection pulp detects the pressure caused by the load or external force applied to the detection cylinder having the piston y1e connected to the load, and sends the cough pressure as pressure *-e to the main valve, and A valve is used to send a pressure relief signal, lift the load, and move it in the vertical direction. (9 chairs) The front delivery iris is lifted and moved vertically every time it is fed from the inside.
With this in mind, the screw F of the screw A in the detection cylinder is
A first piston rod is attached to the piston so as to be slidable via a splinter;
A second piston rod is formed that is continuous with the first piston rod and has a sufficiently larger cross section and area than the first piston rod, and is connected to the lower end of the piston rod of the iris 2 and Furthermore, when a force is applied in the downward direction, the first and second piston rods are moved upward or downward by the deflection of the Sgelinda, respectively, and the volume inside the detection cylinder I is increased. The pressure inside the detection cylinder is changed by decreasing or increasing the difference in cross-sectional area between the piston rod and the second piston rod x the amount of movement, so as to move the load in the vertical direction. What we did 1 - Nine hoists equipped with a characteristic load change tracking device. Q) By supporting the lower part of the second piston rod outwardly of the sensing cylinder via a spring, the lower part of the second piston rod is supported by the sensing cylinder when the first and second piston rods move upward or downward. A patent claim characterized in that the spring applies an upward or downward force to increase or decrease the pressure within the detection cylinder so that the load can be moved in the vertical direction more quickly and easily. A hoist equipped with the load change tracking device according to item 1.