JPS637755Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a dispensing greasing system having a plurality of greasing spools, which are sequentially driven by the greasing pressure from the pump, between a greasing pump and a large number of parts to be lubricated. A device is provided in which a greasing chamber pressurized by the greasing spool is connected to each of the parts to be lubricated, and a predetermined amount of lubricating oil is supplied to each of the parts to be lubricated as the greasing spool is sequentially operated. The present invention relates to a centralized lubrication device that sequentially distributes and supplies oil.

Conventionally, in the above-mentioned centralized greasing system, when clogging occurs in one of the many distribution lines, abnormal noise is generated due to pump overload operation caused by sequential stoppage of operation of the greasing spools. Although the clogging itself can be recognized, since it is not possible to confirm from the outside whether each greasing spool has stopped operating, it is not possible to determine in which distribution system line the clogging has occurred. There were problems in that inspections and repairs required a great deal of time and effort, such as having to check the continuity of each distribution line one by one.

In view of the above-mentioned circumstances, the purpose of the present invention is to make it possible to easily determine which distribution system path has become clogged by rationally improving the original operating structure of the distribution system. It is in.

The characteristic configuration of the present invention is that in the above-mentioned greasing device, two operation confirmation sensors are attached to each of the greasing spools, which act on both stroke ends of the greasing spool, and based on information from these sensors, the greasing spool is adjusted. A device is provided to indicate which one is causing trouble, and its functions and effects are as follows.

In other words, the greasing spools originally operate sequentially, and if a clog occurs, only the spool corresponding to the clogging path will stop in a neutral state, so the operation of each greasing spool is controlled. By detecting each spool separately using sensors that operate at both stroke ends and displaying which spool is in trouble, it is possible to determine which distribution line has become clogged and to identify any operational problems with that spool. It can be easily distinguished by display, and as a result, inspection and repair can be greatly facilitated by omitting the conventional conduction inspection of each distribution line one by one.

Furthermore, the occurrence of clogging itself can be recognized early on when the spool stops operating due to it, so unlike conventional methods, it can be recognized as soon as the pump is overloaded and an abnormal noise is generated. Compared to conventional methods, we have achieved advantages in terms of protection of the pump.

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

As shown in FIG. 1, a swivel base 2 is attached to a machine base equipped with a pair of left and right crawler traveling devices 1 so as to be freely driven and swiveling by a hydraulic motor 3.
The excavation work device 8 is equipped with a boarding operation section 4 and a driving section 5, and is constructed by attaching a swingable bucket 7 to the tip of a working arm 6 that can swing up and down and bend and extend. 2 is attached so as to be able to swing left and right, and a dozer device 9 that is swingable up and down is attached to the front end of the machine base, thereby forming an excavation work vehicle capable of earth removal work.

Each pivot part of the excavation work device 8, a swing race part that rotatably supports the swing base 2 on the machine base, and a dozer device 9.
As shown in FIG. 2, the structure for automatically supplying lubricating oil to various parts, such as the pivot for the machine base and the axle bearing of the crawler traveling device 1, is constructed by storing the lubricating oil in the removable and replaceable lubricating oil supply cartridge 10. A main greasing device 13 is connected to a piston-driven greasing pump 12 equipped with a case portion 11, and
At the plurality of distribution and discharge portions of the main distribution fat distribution device 13,
A plurality of sub-distribution lubricating devices 14 are connected to each oil line separately,
Furthermore, the distribution and discharge portions of these sub-distribution greasing devices 14 are connected to the aforementioned lubricated portions through separate oil passages.

Then, the greasing piston 16 of the pump 12, which is biased toward the shortening side by the spring 15, is extended toward the greasing side by the hydraulic pressure diverted from one of the oil supply passages 17 that connects the swing motor 3 and the working hydraulic pump P. The turning operation valve 1 is configured so as to
When the swivel base 2 is operated by the operation 8, a predetermined amount of lubricating oil is automatically and forcibly supplied to all the parts to be lubricated via the respective greasing devices 13 and 14.

In the figure, 20 is for returning surplus oil in the cylinder part 21 to the lubricating oil receiving part 22 which communicates the cartridge 10 and the cylinder part 21 as the piston 16 extends into the greasing cylinder part 21. 23 is a relief valve mechanism, and 23 is a pump discharge port 24
This is an oil passage with a relief valve 26 for returning excess oil among the lubricating oil sent out to the main distribution greasing device 13 side from the pump return port 25 to the receiving part 22.

As shown in FIGS. 3 and 4, the distribution fat distribution devices 13 and 14 are composed of three sliding valve bodies 27a, 27b, and 27c arranged in parallel in the axial direction, and these valve body parts. 2 between 27a, 27b, 27c
Three sliding spools 29a, 29b, 29c forming two annular oil passages 28a, 28b are housed in a casing 30, and a central greasing passage 31 connected to the greasing pump 12 is connected to each spool 29a, 29b, 29c.
Each spool 29a, 29b, 29c is configured to selectively communicate with the two annular oil passages 28a, 28b of the spool 29a, 29b, 29c by the displacement of the central valve body portion 27b accompanying the sliding movement of c. Furthermore, each spool 29a, 29
greasing chambers 32a formed at both ends of b, 29c;
32b is the spool 29c, 29 located adjacent to one side of each spool 29a, 29b, 29c.
a, 29b (that is, the third spool 29c is connected to the second spool 29c, and the second spool 29b is connected to the first spool 29).
(with respect to a, the first spool 29a is reversed to the left and right with respect to the third spool 29c) via the internal oil passages 33a and 33b, and the left and right are reversed only from the first spool 29a to the third spool 29c. A total of six distribution pipes 34 are connected to the external pipes _{1 to} 6 at all times, and a total of six annular oil passages 28a, 2 are connected to the external pipes 1 to 6, respectively.
8b is in communication with the central lubrication passage 31, the corresponding distribution passage 34 is closed by one of the valve bodies 27a, 27c on both ends, and the annular oil passages 28a, 28b are in communication with the central lubrication passage 31. A corresponding distribution passage 34 is provided so as to communicate with the annular oil passages 28a, 28b when the oil passage 31 is out of communication with the annular oil passage 28a, 28b.

In other words, as shown in Figure 4A, each spool 2
When lubrication pressure from the pump 12 acts on the central lubrication oil passage 31 with 9a, 29b, and 29c located at the stroke ends on the right side in the figure, the third spool 2
The first spool 2
Lubricating oil is supplied under pressure to the right greasing chamber 32b of 9a, and as a result, the first spool 29a slides to the left stroke end, as shown in FIG. greasing room 3
An internal oil passage 33a through which lubricating oil in 2a communicates with the greasing chamber 32a, and a third spool 29c.
It is pressurized and supplied to the first external partial pipe _l1 via the other annular oil passage 28b and the distribution passage 34 corresponding thereto.

Then, with the greasing pressure from the pump 12 after the first spool 29a reaches the left stroke end,
As shown in FIG. 4 B to C, the second spool 29b
moves to the left stroke end, and the lubricating oil in the left greasing chamber 32a of the second spool 29b is supplied under pressure to the second external partial pipe _l2 , and subsequently, the lubricating oil is supplied from the pump 12. As the third spool 29c moves to the left stroke end under pressure, lubricating oil is supplied under pressure to the third external pipe _l3 , and then, in a reverse operation to the above, the lubricating oil from the pump 12 moves each spool 29a, By sequentially moving 29b and 29c to the right stroke end, lubricating oil is sequentially supplied under pressure to the fourth, fifth, and sixth external partial pipes _l4 , _l5 , and _l6 to return to the initial state. return.

A pair of self-returning limit switch type sensors 35a, 35b are installed on each of the greasing spools 29a, 29b, 29c to detect when the greasing spools 29a, 29b, 29c reach the left and right stroke ends by contact with them. The sensors 35a and 35b are provided so that they light up when the sensors 35a and 35b are pressed.
The lamps R _{1 to} R 6, which are separately connected to the spools 29 a, 35 b, are arranged in a line so that they light up sequentially from one end in accordance with the operating order of the spools 29 a, 29 b, 29 c, and displayed in the display box 36 of the operating section 4. established,
As a result, when the greasing pump 12 is in the operating state during the swing operation, the lighting states of the lamps R _{1 to R 6} shift sequentially along the lamp row, so that the dispensing greasing devices 13 and 1
In order to confirm that the greasing spools 29a, 29b, 4 are operating normally, even though the greasing pump 12 is in operation, due to clogging in any of the distribution channels, the greasing spools 29a, 29b, When 29c becomes inoperable, the next lamp R o ₊ 3 of the three successive lit lamps R _o , R _o+1 , R _o+2
The structure is such that it is possible to easily determine which distribution line is clogged by checking the number (n+3) of the block.

The two operation confirmation sensors 35a, 35b that act on the greasing spools 29a, 29b, 29c at their stroke ends on both sides are as follows:
Instead of using a contact type limit switch, it is possible to use various types of sensors, such as a pressure switch that detects the lubricating oil pressure in the greasing chambers 32a, 32b pressurized by the spools 29a, 29b, 29c. be.

Also, based on the information from these sensors 35a, 35b, the greasing spools 29a, 29b, 29c
The device 36 for displaying which one is in trouble has its specific circuit configuration and display form, such as digitally displaying the arrangement number of the distribution system in trouble, instead of displaying the lamp R as described above. Various improvements are possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the central lubrication system according to the present invention, in which Fig. 1 is an overall side view of an excavating work vehicle, Fig. 2 is a lubrication circuit diagram, and Fig. 3 is an internal structural diagram of a distributed lubrication system. , FIGS. 4A, 4B, and 4C are diagrams showing the operating state of the greasing spool. 12... Greasing pump, 13, 14... Distribution greasing device, 29a, 29b, 29c... Greasing spool, 32a, 32b... Greasing chamber, 35a, 35b
...Operation confirmation sensor.

Claims (1)

[Scope of utility model registration request] Distributing greasing devices 13 and 14 have a plurality of greasing spools 29a, 29b, and 29c, which are sequentially driven by the greasing pressure from the pump 12, between the greasing pump 12 and a large number of parts to be lubricated. The central greasing device is provided with greasing chambers 32a, 32b pressurized by the greasing spools 29a, 29b, 29c and separately connected to the parts to be lubricated, wherein the greasing spools 29a, 29b , 29c are provided with two operation confirmation sensors 35a and 35b that act at both stroke ends, and these sensors 3
This centralized greasing device is provided with a device 36 that displays which of the greasing spools 29a, 29b, and 29c is causing trouble based on information from 5a and 35b.