KR102281585B1 - grease discharge pump using self-pressure directional valve - Google Patents

Abstract

The posted content relates to a continuous automatic grease discharge pump using a magnetic pressure directional selector valve to automatically and repeatedly supply grease to the lubrication part of construction machinery (hydraulic breaker, etc.)
A continuous automatic grease discharge pump using a magnetic pressure directional switching valve according to an embodiment of the present specification is
It is applied to a continuous automatic grease discharge pump using a magnetic pressure directional switching valve to transfer the grease contained in the grease cartridge to the lubricating part of the construction machine.
a driving piston in which a piston is reciprocated by hydraulic oil supplied from a hydraulic pump, and divided into first and second driving chambers by the piston;
It is installed in the flow path between the hydraulic pump and the driving piston, and when the hydraulic oil pressure supplied to any one of the first and second driving chambers reaches the set pressure and is applied as a signal pressure, it is switched to change the driving direction of the piston control valve;
A time adjustment valve installed in a first flow path between the control valve and the first driving chamber and a second flow path between the control valve and the second driving chamber, for adjusting a time for which grease is supplied to the lubricating part ;
It is driven by the hydraulic oil supplied from any one of the first and second driving chambers and the hydraulic oil supplied from any one of the first and second flow passages, and the lubrication unit sucks the grease from the grease cartridge during operation and passes through a discharge pipe. grease suction and discharge pumps for transferring to
A first variable relief valve installed in the parallel flow path connecting the supply side flow path and the return side flow path of the control valve, the first variable relief valve for maintaining the hydraulic oil supplied to the driving piston at a set pressure; A continuous automatic grease discharge pump using a valve is provided.

Description

Continuous automatic grease discharge pump using self-pressure directional valve

This specification relates to a grease discharge pump, and more specifically, to a continuous automatic grease discharge pump using a magnetic pressure directional switching valve for repeatedly and automatically supplying grease to a lubricating part of a construction machine (hydraulic breaker, etc.) .

Unless otherwise indicated herein, the material described in this section is not prior art to the claims of this application, and inclusion in this section is not an admission that it is prior art.

In general, the hydraulic breaker is used so that the piston inside the breaker drives the chisel to crush the rock or the like when hydraulic pressure is supplied. At this time, the chisel and the chisel guide surface of the hydraulic breaker are subjected to severe friction and thus lubrication is required.

Most hydraulic breakers have nipples for filling lubricating oil (referring to grease) at each location requiring lubrication, and the user fills the lubricating oil periodically or as needed. In this case, time is wasted for the breaker user, and if the lubricant is not filled in a timely manner, the breaker may be damaged, and eventually the life of the breaker will be shortened.

Although not shown in the drawings, an automatic lubrication pump is installed in the hydraulic breaker of the prior art to automatically discharge grease to a necessary location, but a part of the hydraulic oil (hydraulic) supplied to drive the hydraulic breaker is drawn out to discharge the grease. is composed Due to this, the grease pumping structure is complicated and the size is large, and since the grease storage container is disposable, there is a problem in that the maintenance cost is increased.

A self-lubricating pump having a double-acting driving piston, a self-lubricating pump having a magnetic pressure directional valve in Korean Patent Publication No. 10-0687793 and a double-acting driving piston in Registration No. 10-0687793, a hydraulic striking tool having the same and a lubrication method thereof there is.

The embodiment of the present specification relates to a continuous automatic grease discharging pump using a magnetic pressure directional selector valve, which can protect the lubricating part by repeatedly automatically supplying grease to the lubricating part during long-time operation of a hydraulic breaker or the like.

According to an embodiment of the present specification to achieve the above and other purposes of the present specification,

It is applied to a continuous automatic grease discharge pump using a magnetic pressure directional switching valve to transfer the grease contained in the grease cartridge to the lubricating part of the construction machine.

a driving piston in which a piston is reciprocated by hydraulic oil supplied from a hydraulic pump, and divided into first and second driving chambers by the piston;

It is installed in the flow path between the hydraulic pump and the driving piston, and when the hydraulic oil pressure supplied to any one of the first and second driving chambers reaches the set pressure and is applied as a signal pressure, it is switched to change the driving direction of the piston control valve;

A time adjustment valve installed in a first flow path between the control valve and the first driving chamber and a second flow path between the control valve and the second driving chamber, for adjusting a time for which grease is supplied to the lubricating part ;

It is driven by the hydraulic oil supplied from any one of the first and second driving chambers and the hydraulic oil supplied from any one of the first and second flow passages, and the lubrication unit sucks the grease from the grease cartridge during operation and passes through a discharge pipe. grease suction and discharge pumps for transferring to

A first variable relief valve installed in the parallel flow path connecting the supply side flow path and the return side flow path of the control valve, the first variable relief valve for maintaining the hydraulic oil supplied to the driving piston at a set pressure; A continuous automatic grease discharge pump using a valve is provided.

The continuous automatic grease discharge pump using the magnetic pressure directional switching valve according to the embodiment of the present specification having the above configuration has the following advantages.

When a hydraulic breaker, etc. is operated for a long time, the grease discharged by the grease discharge pump driven by the pressure formed in the hydraulic system is repeatedly automatically supplied to the lubrication unit to protect the lubricating unit and extend the service life. do.

1 is a schematic hydraulic circuit diagram of a continuous automatic grease discharge pump using a magnetic pressure directional switching valve according to a preferred embodiment of the present specification;
2 is a view of a grease suction mode in the grease discharge pump shown in FIG. 1;
3 is a view of a grease discharging mode in the grease discharging pump shown in FIG. 1;
4 is an enlarged view of part "C" shown in FIG. 2;
5 is an enlarged view of part "D" shown in FIG. 3;
6 is a schematic side view and a plan view of the grease discharge pump shown in FIG. 1 .

Hereinafter, a continuous automatic grease discharge pump using a magnetic pressure directional switching valve according to a preferred embodiment of the present specification will be described in detail with reference to the accompanying drawings.

1 to 6 , a continuous automatic grease discharge pump using a magnetic pressure directional switching valve according to an embodiment of the present specification is provided.

Magnetic pressure for transferring grease accommodated in a grease cartridge 10 detachably mounted to the pump block 31 to a lubricating part (not shown) of a construction machine (for example, a hydraulic breaker, etc.) Applied to continuous automatic grease discharge pump using directional valve (A),

The piston 12 is reciprocated by hydraulic oil supplied from a hydraulic pump (not shown), and the driving piston 15 is partitioned into the first and second driving chambers 13 and 14 by the piston 12;

It is installed in the flow path between the hydraulic pump and the driving piston 15 , and the hydraulic oil pressure supplied to any one of the first and second driving chambers 13 and 14 moves to the stroke end of the piston 12 . When the set pressure is reached and applied to the input port as a signal pressure, the control valve 16 for changing the driving direction of the piston 12 as it is switched to the first switching position 37 or the second switching position 38;

Installed in the first flow path 17 between the control valve 16 and the first driving chamber 13 and the second flow path 18 between the control valve 16 and the second driving chamber 14, the lubrication part first and second time adjustment valves (19, 20) for adjusting the time when the grease is supplied;

It is driven by the hydraulic oil supplied from any one of the first and second driving chambers 13 and 14 through the flow path 36 and the hydraulic oil supplied from any one of the first and second flow paths 17 and 18, and is operated with grease a grease suction and discharge pump 22 for sucking the grease of the cartridge 10 and transferring it to the lubrication part through the discharge pipe 21;

The first variable relief provided in the parallel flow path 25 connecting the supply side flow path 23 and the return side flow path 24 of the control valve 16 and for maintaining the hydraulic oil supplied to the driving piston 15 at a set pressure. A valve (26); characterized in that it is provided.

According to a more preferred embodiment, the above-described first time adjustment valve 19 is

A poppet-type first body (27) installed to be opened and closed in the first flow path (17), a first orifice (28) penetrating through one end of the first body (27), and a first orifice (28) A second orifice 29 that is formed through the first body 27 in a radial direction so as to communicate with the second orifice 29, and the first body 27 by pressing the first body 27 to close the first flow path 17 is elastically biased to the initial state. 1 elastic member 30 (compression coil spring is used); and

The above-described second time adjustment valve 20 is

A poppet-type second body 32 installed in the second flow path 18 to be opened and closed, a third orifice 33 penetrating through one end of the second body 32 , and the third orifice 33 are communicated with each other. A second elastic member for elastically biasing the fourth orifice 34 formed through the second body 32 in the radial direction and closing the second flow path 18 by pressing the second body 32 to the initial state. (35) (a compression coil spring is used);

When the piston 12 is moved to the stroke end position as the hydraulic oil of the first flow path 17 is supplied to the first driving chamber 13 through the first orifice 28 (as shown in the drawing in FIG. 1 ) moving in the right direction), as the pressure in the first driving chamber 13, which rises to the set pressure, is applied as a signal pressure to the input port of the control valve 16 (the left port in the drawing in FIG. 1), the control valve 16 switch the spool of the first switching position (37),

As the spool of the control valve 16 is switched to the first switching position 37, the hydraulic oil of the second flow passage 18 passes through the third orifice 33 and is supplied to the second driving chamber 14, the piston 12 ) is moved to the stroke end position (moving in the left direction in the drawing in FIG. 1), the pressure in the second driving chamber 14 that is raised to the set pressure is the input port of the control valve 16 (in the drawing in FIG. 1). The spool of the control valve 16 is switched to the second switching position 38 as a signal pressure is applied to the right port).

Therefore, when the hydraulic pump is driven, as the spool of the control valve 16 is repeatedly switched to the first switching position 37 or the second switching position 38 by the pressure formed in the hydraulic circuit itself, the driving piston ( The piston 12 of 15) repeats the reciprocating motion within the stroke.

a first check valve 39 for preventing backflow installed in the discharge pipe 21 described above and allowing the grease to be transferred from the grease cartridge 10 to the lubrication unit in one direction only by driving the grease suction and discharge pump 22; It is characterized in that it further comprises.

For this reason, as the grease in the discharge pipe 21 is prevented from flowing back to the grease suction and discharge pump 22 by the first check valve 39 for preventing backflow, the grease contained in the grease inside the discharge pipe 21 is prevented. It is possible to prevent foreign substances such as dust from penetrating into the sliding part of the pump piston 54 of the grease suction and discharge pump 22 .

Grease for manually injecting grease into the discharge pipe 21 by using a grease gun not shown through a grease injection nipple 48 that is branched and connected to the discharge pipe 21 described above and is formed at the inlet. Manual injection pipe 40; characterized in that it further comprises.

For this reason, when a predetermined grease is not smoothly supplied to a lubricating part of a construction machine or the like due to the inoperability of the grease suction and discharge pump 22 , the operator uses the grease formed at the inlet of the manual grease injection pipe 40 . Grease may be supplied to the discharge pipe 21 through a grease injection gun (not shown) detachably coupled to the injection nipple 48 .

A second check valve 41 for preventing backflow installed in the above-described manual grease injection pipe 40 and allowing the grease to move from the grease injection nipple 48 to the discharge pipe 21 side in only one direction; characterized in that it further comprises do it with

For this reason, when the grease of the grease cartridge 10 is transferred to the lubrication unit by passing the discharge pipe 21 by driving the grease suction and discharge pump 22, the grease in the discharge pipe 21 transferred to the lubrication unit It is possible to prevent a part from leaking to the outside through the grease injection port 48 formed at the inlet of the manual grease injection pipe 40 by the second check valve 41 for preventing backflow.

Reference numeral 31 in the drawing denotes a pump block to which the driving piston 15 is reciprocally coupled, the grease suction and discharge pump 22 is coupled, and the grease cartridge 10 is detachably mounted. .

Hereinafter, an example of use of a continuous automatic grease discharge pump using a magnetic pressure directional switching valve according to an embodiment of the present specification will be described with reference to the accompanying drawings.

1 to 6, the hydraulic oil discharged by the driving of the above-described hydraulic pump (not shown) passes through the "P" port to the control valve 16 (second switching position 38). After passing through the internal spool of the switched state), it passes through the first orifice 28 of the first time adjustment valve 19 along the first flow path 17 to the first drive chamber of the drive piston 15 ( 13) is supplied.

At this time, the hydraulic oil discharged from the second driving chamber 14 of the driving piston 15 is the flow path 36, the second time adjustment valve 20, the second flow path 18 and the spool of the control valve 16, " It is drained to a hydraulic tank (not shown) via the T" port in turn.

When the piston 12 of the above-described driving piston 15 moves in the right direction in the drawing of FIG. 1 and moves to the stroke end, the pressure inside the first driving chamber 13 is increased. As the poppet 42a of the first pressure control unit 42 is pressurized by the increased pressure and switched to an open state, the hydraulic oil in the first flow path 17 passes through the first pressure control unit 42 and the control valve 16 ) is supplied as a signal pressure to the input port (the left port in the drawing in FIG. 1). As a result, the spool of the control valve (16) is switched to the first switching position (37).

At this time, the control valve 16 is configured such that two spools of the pilot spool 49 and the direction switching spool 50 are switched on the same axis, respectively. When the pressure passing through the first pressure control unit 42 on the "A" side is applied as a signal pressure to the input port of the control valve 16, the pilot spool 49 is switched first (refer to FIG. 2). .

For this reason, the pressure passing through the port (P) acts between the direction change spool 50 and the body inner wall 51 via the switched pilot spool 49, and due to the reaction, the direction change spool 50 This will move toward the "A" part. In this process, the hydraulic oil on the right side of the pilot spool 49 passes through the "B" side second check valve 45 and is drained to a hydraulic tank (not shown).

That is, as the flow path is switched as shown in FIG. 3, the hydraulic oil discharged from the hydraulic pump moves to the second driving chamber 14 of the driving piston 15 through the “B” port. 12) is moved in the left direction in the drawing of FIG. 1 .

At this time, when the piston 12 is moved to the end of the stroke, the spool of the control valve 16 is opened as the poppet 43a of the second pressure control unit 43 on the “B” side is opened in the drawing of FIG. 1 , It is switched to the second switching position 38 in the left direction (refer to FIGS. 1 and 2).

Therefore, as the spool of the control valve 16 is repeatedly switched to the first switching position 37 or the second switching position 38 by the pressure formed in the hydraulic circuit itself while the hydraulic pump is driven, the driving piston 15 ) of the piston 12 repeatedly reciprocates within the stroke.

The first and second check valves 44 and 45 described above serve to discharge hydraulic oil when the control valve 16 is switched in the first and second pressure control units 42 and 43 . That is, when the pressure in the driving piston 15 rises and pressurizes the poppets 44a and 45a of the first and second check valves 44 and 45, the pressure must be higher than the pressure that can be switched to the open state through the return flow path 52 . Drained hydraulic fluid can be passed through.

On the other hand, as some of the hydraulic oil supplied along the second flow path 18 from the above-described hydraulic pump (not shown) passes through the flow path 36 and is supplied to the driving piston 15, the piston of the driving piston 15 ( 12) is driven to the stroke end in the left direction in the drawing of FIG. 1, and at the same time, a part of the hydraulic oil of the second flow path 18 passes through the second time adjustment valve 20 to the grease suction and discharge pump 22. supply

As described above, when the pump piston 54 of the grease suction and discharge pump 22 is moved backward (moved in the left direction in the drawing of FIG. 2 ), by the vacuum pressure formed in the grease pump chamber 56 , the grease Grease suction and discharge grease from the discharge port 10a through the grease suction pipe line 22a formed in the pump block 31 so as to communicate with the discharge port 10a of the cartridge 10 and the grease pump chamber 56 formed inside the pump 22 can be inhaled with

When the pump piston 54 of the aforementioned grease suction and discharge pump 22 is moved forward by the elastic restoring force of the elastic member 55 (moved in the right direction in the drawing of FIG. 3 ), the grease pump chamber 56 Since the grease is pressurized, the check valve 57 formed at the outlet of the grease pump chamber 56 is opened by the grease pressure discharged from the grease pump chamber 56 .

Accordingly, the grease accommodated in the grease pump chamber 56 of the grease suction and discharge pump 22 can be transferred to the discharge pipe line 21 through the grease discharge port 53 formed in the pump block 31 .

Meanwhile, when the piston 12 of the driving piston 15 is moved to the stroke end by hydraulic oil supplied from a hydraulic pump (not shown), “A” shown in FIG. 1 denotes the first ,2 The rising pressure inside the driving chambers 13 and 14 is applied as a signal pressure to the control valve 16 to switch the spool, thereby repeatedly changing the driving direction of the piston 12, and thereby The technical contents of repeatedly driving the piston 12 within the stroke by switching the spool of the control valve 16 by pressure, the technical contents of the magnetic pressure directional switching valve published in Korean Patent Publication No. 10-0687793 and Since they are substantially the same, further detailed description will be omitted.

In addition, "B" shown in FIG. 1 indicates that when hydraulic oil is supplied from a hydraulic pump (not shown), the pump piston 54 is repeatedly linearly reciprocated to the grease cartridge 10 by the grease suction and discharge pump 10 . The technical content of sucking the contained grease and transferring it to the lubricating part of the construction machine (hydraulic breaker, etc.) is substantially the same as the hydraulic grease pump published in Patent Application No. 10-2019-0038058 (2019.04.01), so it is no longer detailed. A description is omitted.

Here, although the foregoing specification has been described with reference to preferred embodiments, those skilled in the art can variously modify and modify the present specification without departing from the spirit and scope of the present specification as set forth in the following claims. You will understand that you can change it.

10; grease cartridge
11; Magnetic pressure directional valve
12; piston
13; 1st drive chamber
14; 2nd drive chamber
15; drive piston
16; control valve
17; 1st Euro
18; 2nd euro
19; 1st time adjustment valve
20; 2nd time adjustment valve
21; discharge pipe
22; Grease suction and discharge pump
23; supply side flow
24; return euro
25; parallel side flow path
26; 1st Variable Relief Valve
27; Poppet type first body
28; first orifice
29; 2nd orifice
30; first elastic member
31; pump block
32; Poppet type 2nd body
33; 3rd Orifice
34; 4th orifice
35; second elastic member
36; Euro
37; 1st switching position
38; 2nd switching position
39; 1st check valve for backflow prevention
40; Grease Manual Filling Pipe
41; 2nd check valve for backflow prevention
42; first pressure control unit
43; 2nd pressure control unit
44; 1st check valve
45; 2nd check valve
46; poppet
47; elastic member
48; grease injection nipple

Claims (5)

It is applied to a continuous automatic grease discharge pump using a magnetic pressure directional switching valve to transfer the grease contained in the grease cartridge to the lubricating part of the construction machine.
a driving piston in which a piston is reciprocated by hydraulic oil supplied from a hydraulic pump, and divided into first and second driving chambers by the piston;
It is installed in the flow path between the hydraulic pump and the driving piston, and when the hydraulic oil pressure supplied to any one of the first and second driving chambers reaches the set pressure and is applied as a signal pressure, it is switched to change the driving direction of the piston control valve;
A first time adjustment valve installed in a first flow path between the control valve and the first driving chamber includes a poppet-type first body installed in the first flow path to be opened and closed, and a first body penetratingly formed at one end of the first body. A first orifice, a second orifice that is formed through the first body in a radial direction so as to communicate with the first orifice, and a first elastic bias of the first body closed by pressing the first body to an initial state having an elastic member;
A second time adjustment valve installed in a second flow path between the control valve and the second driving chamber includes a second poppet-type body that is operably installed in the second flow path to open and close, and a second body penetratingly formed at one end of the second body. A third orifice, a fourth orifice that is formed through the second body in a radial direction so as to communicate with the third orifice, and a second elastic bias biasing the closing of the second flow path by pressing the second body to an initial state having an elastic member;
It is driven by the hydraulic oil supplied through any one of the first and second driving chambers and the hydraulic oil supplied from any one of the first and second passages, and when driving, the grease of the grease cartridge is sucked through the discharge pipe. a grease suction and discharge pump for transferring the lubricant;
Continuous using a magnetic pressure directional switching valve having; a first variable relief valve installed in a parallel flow path connecting the supply side flow path and the return side flow path of the control valve, and for maintaining the hydraulic oil supplied to the driving piston at a set pressure For automatic grease discharge pumps:
a first check valve for preventing backflow installed in the discharge pipe and allowing the grease to move from the grease suction and discharge pump to the lubrication unit in only one direction;
Continuous automatic grease using a magnetic pressure directional selector valve, characterized in that it is installed in the manual grease injection pipe, and includes a second check valve for preventing backflow that allows the grease to move from the grease injection nipple toward the discharge pipe in only one direction. discharge pump. delete delete delete delete

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