JPH0354203Y2 - - Google Patents

Description

[Detailed description of the invention] Currently, a two-pump system is often used in the hydraulic system of hydraulic excavators. In this method, two multiple valves are installed side by side, each multiple valve has a circuit independent from the hydraulic pump, and each distribution valve that makes up the multiple valve has a circuit connected to the actuator. For those that require a particularly large amount of oil, a merging circuit is formed from each of both multiple valves so that they can be supplied with oil by merging from both hydraulic pumps. In other words, both multiple valves have a distribution valve that communicates with the arm and a distribution valve that communicates with the boom, and by operating these distribution valves simultaneously, oil can flow from both pumps to the arm or boom. We are doing everything we can to supply it. When replacing the attachment of a hydraulic excavator with such a hydraulic system and using it for other work, for example, attaching a special attachment such as a hydraulic breaker or hydraulic static crushing machine,
When used for crushing buildings, roads, etc., one of the distribution valves in the distribution valve group is changed to a special attachment. If a large amount of oil is required, use one of the distribution valves in the other distribution valve group, connect the rods of these distribution valves with a link, and operate the central part with a special attachment. connected to the rod of the operating lever, and operates the two distribution valves simultaneously by operating the operating lever,
The oil from both pumps is combined and supplied to a special attachment. Even when a special attachment is attached to a hydraulic excavator and used in this way, the special attachment may be used alone or in combination with a merging circuit, and the special attachment may be replaced and a bucket belt installed, allowing the hydraulic excavator to be used as a backhoe. Multi-functionality is being planned. However, in the past, when the attachments were replaced in this way, the method of connecting the operating lever and the distribution valve was changed depending on the attachment. This method requires the removal of the existing coupling lever and the installation of a new coupling lever, which is a very cumbersome task.

This idea was devised in view of the above points, and when using a hydraulic excavator as a working machine with a backhoe or special attachment, it is extremely easy to connect the rod connecting pin between the operating lever and the distribution valve. The purpose of this invention is to provide a device that solves the problem by fitting and removing the problem.

The configuration of this invention is to divide the rod of the distribution valve, which is added for the merging of the boom and arm, into two parts, the front and the rear, among the distribution valves of the multiple valves arranged in parallel on the hydraulic excavator. The rods can be connected to each other by links, the central part of which can be connected to a lever for operating a special attachment, and one end of the link can be fixed to a fixed part with a pin.

Whether the hydraulic excavator is used as a backhoe or a special attachment is attached to use the distribution valve in a different manner, it is very convenient because it can be easily changed by simply replacing the pin.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 and 2 are multiple valves used in the hydraulic system of hydraulic excavators.Multiple valve 1 on the left is composed of four distribution valves 3, 4, 5, and 6, and multiple valves on the right The valve 2 is composed of four distribution valves 7, 8, 9, and 10. Distribution valves 4 and 7 are distribution valves for arm operation, and distribution valves 3 and 8 are distribution valves for boom operation, but among these distribution valves, distribution valve 3 and distribution valve 7 are for boom operation, This is used when forming a merging circuit to increase the operating speed of the arm, and there is no need to increase the speed, and
When a special attachment is attached and the hydraulic excavator is used for purposes other than a backhoe, these distribution valves 3 and 7 are used. The distribution valve 5 is used for bucket operation, the distribution valve 9 is used for turning, and the distribution valves 6 and 10 are used for traveling. 11 is a boom operation lever, and the rods connecting the operation lever 11 and the rod 12 of the distribution valve 3 are a front rod 13 connected to the rod 12 of the distribution valve 3, and a rear rod 14 connected to the operation lever 11. Both rods 13 and 14 are pivotally supported by a removable pin 15, and the distribution valve 3 can be operated by operating the operating lever 11. Similarly, the rod between the rod 16 of the distribution valve 7 and the arm operating lever 17 consists of a front rod 18 connected to the rod 16 and a rear rod 19 connected to the operating lever 17, and both rods 18 and 19 are detachable. It is pivoted by pin 20 of
The distribution valve 7 can be operated by operating the operating lever 17. Reference numeral 21 denotes a link for connecting the left front rod 13 and the right front rod 18. The left end of the link 21 is pivoted to the middle part of the left front rod 13 by a removable pin 22, and the right end The part is pivoted to a fixed part 30 attached to the fuselage by a detachable pin 28, and is pivoted to the rod 18 by a detachable pin 23 slightly to the left, that is, closer to the center. Note that the pins 23 and 28 are not inserted and used at the same time, but are used either by removing one or both. 24 is a lever for operating a special attachment, and a rod 2 is pivotally supported on the operating lever 24.
The distal end of the link 5 is pivotally supported approximately in the center between the pins 22 and 23 of the link 21 by a detachable pin 26. In addition, 29, 31, 32, 3 shown in FIG.
3, 34, 35, and 36 are all pins.

Although the present invention is constructed as described above, a case in which it actually operates will be explained.

First, the case where it is used as a backhoe will be explained. In this case, link 21 and front rod 1
3, and the pin 23 that connected the link 21 and the front rod 18. In other words, the relationship between the front rods 13, 18 and the link 21 is severed. Operate the operating lever 11 to open the distribution valves 3 and 8.
Also, operate the operating lever 17 to open the distribution valve 7,
4 can be operated individually, and work as a normal backhoe can be performed.

Next, when a special attachment such as a percussion type hydraulic breaker is attached to carry out crushing work, the distribution valve 3 is used for the hydraulic breaker.
When the distribution valve 3 is used as a backhoe,
It is used at the same time as the distribution valve 8 to form a combined sulfur circuit, but if the operating speed of the boom is not required so much, the oil from only one distribution valve 8 can sufficiently perform its function. The distribution valve 3 may be used for other purposes. Therefore,
In this case, the pin 15 is removed to disconnect the front rod 13 and the rear rod 14, and the pin 23 is removed to disconnect the link 21 and the front rod 18. The pins 22, 26, 28, and 29 are kept in the inserted state. When the special attachment operating lever 24 is operated, the link 21 rotates around the pin 28 at the right end and operates the front rod 13 connected to the left end, allowing the distribution valve 3 to be operated. A hydraulic breaker leading to the distribution valve 3 can be activated. Note that when using the hydraulic breaker, the arm is moved, but the arm operating lever 17 is connected to the pin 20.
is inserted and the pin 23 is removed, the control lever 17 can be operated to operate the distribution valve 7, so the arm can operate with the merging circuit formed.

Next, we will discuss the case where a hydrostatic type hydraulic crusher is installed. This type of hydraulic crusher requires a relatively large amount of oil. Therefore, in the case of such a hydraulic crusher, a confluence circuit is formed from the distribution valves in both multiple valves to supply a large amount of oil to the hydraulic crusher. Distribution valve 7 is a distribution valve used to operate the arm when used as a backhoe, and forms a merging circuit with distribution valve 4, but when working with a static pressure hydraulic crusher, operating the arm does not require much speed. If so, it may be used for other purposes as in the case of the distribution valve 3. For this reason, a confluence circuit is formed from the distribution valve 3 and the distribution valve 7 to the static pressure type hydraulic crusher, and these distribution valves 3,
7 at the same time to operate the hydraulic crusher. In this case, pins 15 and 2 connect the left and right front rods 13 and 18 and the rear rods 14 and 19, respectively.
0, and remove the pin 28 connecting the link 21 and the fixed part 30, and remove the link 21 and the front rod 1.
3, 18, and pin 2 connected to rod 25
2, 26, and 23 are kept in the inserted state. In other words, the operating lever 2 keeps the rod 25 and the front rods 13 and 18 connected via the link 21.
4, the front rod 13 and rod 12 on the left side can operate the distribution valve 3 through the rod 25 and link 21, and the right side can simultaneously operate the distribution valve 7 through the front rod 18 and rod 16. It is possible to operate a hydrostatic type hydraulic crusher in which a merging circuit is formed from the distribution valve.

In addition, when replacing a special attachment such as an impact type hydraulic breaker or a static pressure type hydraulic crusher with a backhoe, remove the pins 22 and 23 that connect the link 21 and the front part 13 and 18, and remove the front rod. 13, 18 and rear rod 14, 1
It is only necessary to insert the pins 15 and 20 connecting the parts 9.

As mentioned above, the present invention not only divides the rod of the distribution valve into front and rear parts, but also connects the left and right front rods with a link. When returning, it is extremely convenient to change to another working format by fitting and removing the pins connecting these rods or links, which is very convenient and beneficial as it saves manpower and time. be.

[Brief explanation of the drawing]

The drawings are all explanatory diagrams of embodiments of the present invention, and FIG. 1 shows the case where it is used as a backhoe, and FIGS. 2 and 3 show the case where it is used with other special attachments attached. 1...Multiple valve, 2...Multiple valve, 3...Distribution valve,
7...Distribution valve, 11...Operation lever, 13...Front rod, 14...Rear rod, 15...Pin, 1
8...Front rod, 19...Rear rod, 20...
...Pin, 21...Link, 22...Pin, 23...
...Pin, 24...Operation lever, 25...Rod,
28...pin, 30...fixing part.

Claims (1)

[Scope of utility model registration request] In a hydraulic system in which a plurality of multiple valves are arranged in parallel, one distribution valve in each multiple valve forms a merging circuit, and the distribution valves are operated simultaneously, the distribution valve and its operating lever are The rod connecting the two is composed of a pair of left and right front rods and a rear rear rod that are connected with a removable pin, and the left and right front rods are connected with a link that is attached with a removable pin. One end is connected to a fixed part provided on the machine body with a removable pin, and the link and the lever for operating the special attachment are connected with a rod attached with a removable pin, so that the hydraulic excavator can operate the special attachment. When the hydraulic excavator is not installed, of all the removably inserted pins mentioned above, the pin connecting the left and right front rods and links can be removed and disconnected, and the hydraulic excavator requires a large amount of oil. When operating a special attachment that does not require a special attachment, among all the removably inserted pins, connect the pin that connects the left front rod and rear rod with the right front rod and link. When the hydraulic excavator is equipped with a special attachment that requires a large amount of oil and is to be operated, the left and right front rods and rear rods are removably inserted. An operating lever device for a hydraulic excavator, characterized in that the pins connecting the rods and the pins connecting the links and the fixing part can be removed to disconnect them.