JPS60252589A - Multistage expanding boom - 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 (Field of Industrial Application) The present invention relates to a multi-stage telescopic boom used for cranes and the like.

(Prior Art) Hydraulic cylinder devices are widely used as boom extension and retraction devices for hydraulic cranes. In recent years, booms have become longer in order to improve work efficiency, and therefore there is a trend toward multi-stage booms. Therefore, a single cylinder device (hereinafter referred to as a two-stage cylinder device) must be installed in a multi-stage boom for the number of boom stages, but the boom of a small crane has a small cross section and the installation space is limited. There was a problem that it was impossible to incorporate it because it was small. Therefore, this problem is solved by combining multiple two-stage cylinder devices into a multi-stage cylinder device and incorporating this into the boom, but the multi-stage cylinder device is also similar to a three-stage cylinder device. 1 is easy to manufacture, but a multi-stage cylinder device with four or five stages becomes quite complicated in its construction. On the other hand, there is a legal regulation that when extending and retracting the boom, the boom must extend sequentially from the proximal end, and conversely, when retracting, it must retract sequentially from the distal end. The problem is that it must be added. Therefore, it has been extremely difficult to manufacture a multi-stage cylinder device having four or more stages that has a sequential expansion and contraction function.

(Problems to be Solved by the Invention) In a three-stage boom, a conventionally known three-stage cylinder device having a sequential expansion and contraction function (for example, Japanese Patent Laid-Open No. 57-12710
If No. 8) is used as it is, it will become a three-stage sequential telescopic boom, but for a multi-stage boom with four or more stages, a multi-stage cylinder device with four or more stages with a sequential telescopic function must be manufactured.

As mentioned above, this is extremely difficult.

Therefore, the present invention aims to provide a multi-stage boom which has a simple structure regardless of the number of boom stages, and which has a sequential expansion and contraction function.

(Means for Solving the Problem) +d In the present invention, at least one commonly used three-stage cylinder device (hereinafter referred to as a three-stage sequential cylinder device) having a sequential expansion and contraction function is used, and a four-stage boom is used. In some cases, the 3-stage sequential cylinder system and the 2-stage cylinder system are used, a 5-stage boom is equipped with two 3-stage sequential cylinder systems, and a 6-stage boom is equipped with two 3-stage sequential cylinder systems and one 2-stage sequential cylinder system. A multi-stage telescopic boom is constructed in the same way below by using the stage cylinder device. That is, three-stage cylinder devices or two-stage cylinder devices are sequentially arranged in series in an inverted position in the boom from the boom base end side.

Therefore, in the case of a four-stage boom, there are three booms between the first and third booms.
Cylinder devices are installed in stages sequentially, and two cylinders are installed between the third and fourth booms.
A stage cylinder device is installed. Alternatively, a two-stage cylinder device is disposed between the first and second booms, and a three-stage sequential cylinder device is disposed between the second and fourth booms.

In the case of a five-stage boom, three-stage cylinder devices are sequentially arranged between the first to third and third to fifth booms, respectively. In the case of a 6-stage boom, there are 3
A stage cylinder device is arranged respectively, and a two-stage cylinder device is arranged between the fifth and sixth booms. Alternatively, a two-stage cylinder device is disposed between the first and second booms, and a three-stage sequential cylinder device is disposed between the second to fourth and fourth to sixth booms, respectively. In the case of a seven-stage boom, three-stage cylinder devices are sequentially arranged between the first to third, third to fifth, and fifth to seventh booms. Similarly, in the case of a 0-stage boom (however, n≧
4) If n is an even number, use a three-stage sequential cylinder device (n
-2)/Two cylinders are installed, and one two-stage cylinder device is installed. If n is an odd number, a three-stage sequential cylinder device (n-1
)/2 pieces will be installed.

Note that these adjacent cylinder devices are connected by piping. That is, if the adjacent cylinder devices are three-stage sequential cylinder devices, the two-stage cylinder device on the distal end side and the three-stage cylinder device on the distal end side constitute a part of the three-stage sequential cylinder device on the proximal end side. The expansion side oil chamber and the contraction side oil chamber of the two-stage cylinder device on the proximal end side, which constitute a part of the stage sequential cylinder device, are communicated with each other through piping. If the adjacent 7 cylinder devices are a 3-stage sequential cylinder device and a 2-stage cylinder device, the 2-stage cylinder device and the 2-stage cylinder device on the distal or proximal end side and constitute a part of the 3-stage sequential cylinder device. The oil chamber on the extension side and the oil chamber on the contraction side are connected through piping.

The sequential expansion and contraction function of the multi-stage boom configured in this way is as follows:
The boom portions connected to the stage-sequential cylinder devices are sequentially expanded and contracted by the cylinder devices, but the boom portions that connect the cylinder devices do not have a sequential expansion and contraction function.

Therefore, for the sequential extension function of the boom at the connecting part of each cylinder device, the pressure receiving area of the extension side oil chamber of the cylinder device on the base end side is configured to be larger than the pressure receiving area of the extension side oil chamber of the cylinder device on the tip side. Provide that function.

This is because if cylinder devices are arranged in series from the proximal end to the distal end in the boom, the cylinder device on the proximal end will normally be larger than the cylinder device on the distal end due to thrust. The pressure receiving area of the extension side oil chamber of the cylinder device on the side is inevitably larger than the pressure receiving area of the extension side oil chamber of the cylinder device on the tip side. Therefore, without providing a special mechanism, the multi-stage boom can be sequentially extended by extending the cylinder device on the distal end side after the cylinder device on the proximal end side has expanded due to the pressure receiving area difference.

Next, regarding the function of sequentially retracting the booms at the connecting portions of each cylinder device, a function for sequentially retracting the booms at the connecting portions is provided. This function is applied to the boom at the connecting part.
A locking device that locks this boom and a boom on the immediate proximal end side adjacent to this boom at the extension end position of the boom,
This locking device is in a locked state when the boom on the end side of the garden adjacent to the boom provided with this locking device starts to extend.
It is configured to be in an unlocked state at the end of reduction.

(Operation) During extension, each boom connected to the three-stage sequential cylinder device is I) sequentially extended by the sequential extension function of the three-stage sequential cylinder device itself. Cylinder device on the proximal end side (if this cylinder device is a three-stage sequential cylinder device,
The two on the tip side that constitute a part of this three-stage sequential cylinder device
When the next cylinder device (stage cylinder device) is extended, the next cylinder device on the distal side (if this cylinder device is a 3-stage sequential cylinder device, the proximal side that forms part of this 3-stage sequential cylinder device) The two-stage cylinder device) is also in an extendable state, but due to the difference in pressure receiving area, after the cylinder device on the proximal end side is completely extended, the next cylinder device on the distal end side is extended. In this way, the multi-stage boom device is extended sequentially from the proximal end to the distal end.

Conversely, when retracting, each boom connected to the three-stage sequential cylinder device is sequentially retracted by the sequential retraction function of the three-stage sequential cylinder device itself. When the cylinder device on the distal end side (if this cylinder device is a 3-stage sequential/cylinder device, the 2-stage cylinder device on the proximal end that constitutes a part of this 3-stage sequential cylinder device) is contracted, The next proximal cylinder device (if this cylinder device is a three-stage sequential cylinder device, the two-stage cylinder device on the distal side that constitutes a part of this three-stage sequential cylinder device) is also in the retractable state. However, the boom connected to the distal end member of the proximal cylinder device is locked by the aforementioned locking device, so the proximal cylinder device does not retract. When the cylinder device on the tip side is completely retracted, the cylinder device on the tip side (if this cylinder device is a three-stage sequential cylinder device, the base that forms part of this three-stage sequential cylinder device) The boom retracted by the two-stage cylinder device on the end side unlocks the locking device, and the cylinder device on the base RM side begins to retract.

This causes the boom connected to the proximal cylinder device to retract. In this way, the multistage boom is sequentially contracted from the distal end side to the proximal end side.

(Example) Fig. 1 shows a second boom 2 inside the first boom 1, a third boom 3 inside the second boom, and a fourth boom 4 inside the third boom 3.
, which shows a five-stage boom formed by slidingly inserting a fifth boom 5 into a fourth boom 4, in which three stages 71 of nongap devices 6 are arranged upside down in sequence between the first to third booms. Set up If the cylinders are reloaded in this three-stage sequence, the first part 6a and the second part 6
b constitutes one two-stage 7-cylinder device, the second part 6b and the third member 6C constitute one two-stage cylinder device, and the second member 61'1 is connected to the first member 6a. is extended, the third member 6C is extended with respect to the second member 6b, and the second member 6C is extended with respect to the second member 6b.
This cylinder device has a conventionally known sequential expansion/contraction function, and is configured such that the second member 6b contracts with respect to the first member 6a after the third member 6C contracts with respect to the first member 6b.

In this example, the end of the first member 6a of the three-stage sequential cylinder device 6 is pivotally supported 7 on the first boom 1, the end of the second member 6b is pivotally supported 8 on the second boom 2, and the third boom 3, third member 6C
Pivot the end of 9. Therefore, by this three-stage sequential cylinder device 6, the second boom 2 and the third boom 3 are retracted 111 times relative to the first boom 1.

Further, 10 is a three-stage sequential cylinder device having exactly the same structure and function as the three-stage sequential cylinder device 6 described above,
The end of the first member 10a is connected to the cylinder device 6 in the previous three stages.
Connecting 1 to the base of the third member 6C via the bracket 11
2, the first part 1'lOa may be directly connected to the third boom 3. Next, attach the end of the second member 101) to the fourth
A pivot 131-, a third member 10 is attached to the base end of the boom 4.
The tip of C is pivoted to the tip of the fifth boom 5, QH opening'<[6. Therefore, the fourth boom 4 and the fifth boom 5 are sequentially expanded and contracted with respect to the third boom 3 by this three-stage sequential cylinder device 10.

Next, the three-stage sequential cylinder device 6 is composed of the second part 6b and the third member 6C of the three-stage sequential cylinder device 6.
This three-stage sequential cylinder device 10 is composed of a two-stage cylinder device on the distal end side, and a first member 1.0a and a second part 10b of the three-stage sequential cylinder device 10. The oil chamber on the extension side and the oil chamber on the contraction side with the ring device are connected by piping 2, so the two on the tip side of the cylinder device 6 are sequentially connected in three stages.
The stage cylinder device and the two-stage cylinder device 6 on the base end side of the three-stage sequential cylinder device 10, that is, the first part 6a with respect to the second member 6b and the second member 10b with respect to the first member 10a are simultaneously in an expandable and retractable state. .

Further, the second and third members 6b of the three-stage sequential cylinder device 6,
The pressure receiving area of the oil chamber on the extension side of the two-stage cylinder device on the distal end side consisting of the cylinder device 1-1 of the three-stage cylinder device 10 is
The second member io is made larger than the pressure receiving area of the oil chamber on the extension side of the two-stage cylinder device on the base end side, which is composed of the second member io a and iob. As a result, during extension, 3, stage sequential cylinder devices 6
After the third member 6c of the third member 6c extends relative to the second member 61), the second part 6b of the three-stage cylinder device 1° is sequentially moved. Ob
The first member 10 a K Td will expand.

Next, 15 is a locking device provided at the base end of the third boom 3, and this locking device locks the third boom 3 to the second boom 2 when the third boom 3 is at the end of extension. When the fourth boom 4 starts to extend, it becomes locked, and when the fourth boom reaches its end of contraction, it becomes unlocked. This locking device 15 is rotatable via a rocker arm 17 rotatably supported via a bracket 16 provided at the lower part of the base end of the third boom 30 and a bracket 19 provided at the upper part of the base end of the third boom 3. Freely movable pivot support 2OL link 2
1, a spring member 22 which is interposed between the bracket 19 and the link 21 and biases the link 2] counterclockwise against the bracket 19;
= The other end is attached to the link 21.0 in the appropriate place,
A chain 23 that prevents the counterclockwise rotation of the link 21 from reaching a predetermined rotation position;
The rocker arm 17 is composed of a link 26 that pivotally connects the proper position of the rocker arm 17 with a proper position of the rocker arm 17, respectively. 27.2
g are holes drilled at the base of the i3 boom 3 and the tip of the second boom 2, and the rocker arm 17 is inserted into these holes 27.2.
8 to lock the third boom 3 and the second boom 2. In addition, 29 is a pivot support 30 rotatably attached to this link 21 in order to smoothly move this link 21 when the base end of the fourth branch 4 comes into contact with the link 21.
This is Laura. Therefore, in this locking device 15, when the fourth boom 4 is stored in the third boom 3 as shown in FIG. is located inside the boom. When the fourth boom 4 is extended, the link 21 biased by the spring lever 22 rotates counterclockwise around the pivot point 2o, causing the rocker arm 17 to rotate.
rotates clockwise around pivot point 18, (L27.2
8 and locks the second boom 2 and third boom 3.

Next, the operation of the five-stage boom shown in FIG. 1 will be explained.

° When pressure oil is sent to the extension side oil passage of the A-stage sequential cylinder device 6, the second member 6b and third member 6c of the three-stage sequential cylinder device 6 are cut into the first member 6a and sequentially extended. First to do
The second boom 2 and the third boom 3 extend sequentially with respect to the boom 1. When the two-stage cylinder device on the distal end side of the three-stage sequential cylinder device 6, and therefore the third member 6C, is extended, the two-stage cylinder device on the base end side of the three-stage sequential cylinder device 100, and therefore the second member 10b, also extends. However, the pressure receiving area of the extension side oil chamber of the two-stage cylinder device on the distal end side of the three-stage sequential cylinder device 6 is smaller than that of the extension-side oil chamber of the two-stage cylinder device on the base end side of the three-stage sequential cylinder device 10. Since it is larger than the pressure receiving area, the two-stage cylinder device on the distal end side of the three-stage sequential cylinder device 6, therefore the third member 6c, expands first, and then the two-stage cylinder device on the base end side of the three-stage sequential cylinder device 10, Therefore, the second member 101) will expand. That is, the fourth boom 4 is extended after the third boom A3 is extended. Fourth
When the boom 4 begins to extend, the rocker arm 17 rotates clockwise around the pivot point 18 as described above.
Enter holes 27 and 28 (see diagram). After the second member 10b of the three-stage sequential cylinder device 10 that extends the fourth boom 4 is extended, the third member 10C will be extended by the function of the three-stage sequential cylinder device 10 itself. After the boom 4 is extended, the fifth boom 5 is extended. In this way, each boom will be extended sequentially.

Conversely, when pressure oil is sent to the contraction side oil passage of the three-stage cylinder device 10, the third member 10C1 and the second member 10b are sequentially reduced, so that the fifth boom 5 and the fourth boom 4 are sequentially reduced. do.

When the second member 101) is contracted, the two-stage cylinder device on the tip side of the three-stage cylinder device 6, that is, the third member 6C
is also in a retractable state, but the third frame 3 connected to the third member 6C is not retracted because it is locked to the second boom 2 by the locking device 15. 3 members 6C
does not shrink.

At this time, the locking device 15 is configured so that the pivot point 24 is located on the right side of the line connecting the pivot points 20 and 25, as shown in FIG. Even if the rocker arm 17 acts, the rocker arm 17 will not rotate.

When the fourth boom 4 reaches the end of its retraction, the base end of the fourth boom 4 begins to contact the link 21, and as shown in FIG. When the link 21 is pushed in the direction, the rocker arm 17
rotates counterclockwise around the pivot point 18, and the hole 27.2
It will pass from 8. As a result, the third member 6C of the three-stage cylinder device 6 starts to contract, and then the second member 6C of the cylinder device 6 starts to contract.
b will be reduced, so the third boom 3 will be reduced,
The second boom 2 will then be retracted. In this way, each boom is sequentially retracted.

(Effects of the Invention) (1) By using a conventionally known three-stage sequential cylinder device having a sequential extension and contraction function, it is possible to realize a boom device that sequentially extends and contracts no matter how many stages the boom has.

(2) Compared to the method of providing two-stage cylinder devices for the number of boom stages, since three-stage cylinder devices are used in sequence, the installation space can be made as small as possible, and this method is suitable for boom devices such as small cranes. This makes it possible to further increase the number of boom stages in large cranes.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a five-stage telescopic boom device showing an example of the present invention, and FIGS. 2 and 3 are explanatory diagrams of main parts. 6.103-stage sequential cylinder device, 15 Locking device, 17
Rocker arm, 21 Link, 22 Spring material, 23
・Chain, 26 links. Patent applicant Uninoku Co., Ltd.

Claims (1)

[Claims] 1. A plurality of three-stage sequential cylinder devices or at least one three-stage sequential cylinder device and one two-stage sequential cylinder device in a multi-stage boom.
In a multi-stage telescopic boom in which stage cylinder devices are arranged upside down and sequentially in series, the cylinder device on the proximal end side of each adjacent cylinder device (if this cylinder device is a three-stage sequential cylinder device, this three-stage sequential cylinder device) the two-stage cylinder device on the tip side that forms part of the cylinder device) and the cylinder device on the tip side (if this cylinder device is a three-stage sequential cylinder device, the base that forms part of the three-stage sequential cylinder device). The extension side oil chamber and the contraction side oil chamber are communicated together with the two-stage cylinder device on the end side (two-stage cylinder device on the end side), and the cylinder device on the base end side (if this cylinder device is a three-stage sequential cylinder device, these three The pressure-receiving area of the extension side oil chamber of the two-stage cylinder device on the tip side that constitutes a part of the stage-sequential cylinder device (if this cylinder device is a three-stage sequential cylinder device, the three-stage cylinder device) The pressure receiving area is larger than the pressure receiving area of the oil chamber on the extension side of the two-stage cylinder device on the proximal end side that sequentially constitutes a part of the cylinder device, and the tip of each cylinder device except for the cylinder device located at the most distal position. A locking device is provided at the base portion of the boom connected to the side member to lock this boom and the directly loaded end side boom adjacent to this boom at the extension end position of this boom. A multi-stage telescopic boom characterized in that it is configured to be in a locked state when the boom on the direct light end side adjacent to the boom provided with the locking device begins to extend, and to be in the unlocked state when the boom ends in contraction. 2. The locking device is configured such that the rocker arm rotatably supported at the base end of the boom is locked by being inserted into a hole drilled in the boom at the directly mounted end adjacent to the boom. A multistage telescopic boom according to claim 1.