JPH0220559Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a lubricating oil supply device configured to intermittently supply a predetermined amount of lubricating fluid to a machine tool, etc. A semiconductor pressure sensor is attached to a pump chamber defined in the pump chamber for storing lubricating oil, which is an incompressible fluid, and the lubricating oil is reliably supplied to machine tools, etc. based on the output signal of this pressure sensor. The present invention relates to a lubricating oil supply device with a pressure sensor that makes it possible to detect whether or not the oil is present.

In general, sliding members, etc. incorporated in cutting machines are held in sliding contact with other members and are driven at relatively high speeds, so lubricating fluid is applied to the gap between the sliding member and the member slidingly in contact with it. need to be supplied. Therefore, lubricating devices incorporating a supply mechanism for supplying lubricating fluid have been widely used in machines having members driven at high speed, such as cutting machines.

FIG. 1 shows an example of a lubricating oil supply mechanism according to this type of prior art. That is, this lubricating oil supply mechanism includes a cylindrical main body 2, which has a chamber 4 formed at one end thereof, a passage 6 defined approximately at the center, and the other end thereof. It has a chamber 8. In this case, the chamber 4, the passage 6, and the chamber 8 are a pressure chamber 7 of the same diameter formed approximately in the center of the main body 2.
and the passage 9 communicate with each other.

The chamber 4 communicates with a lubricating oil outlet port 12 via a passage 10, and a check valve 14 is also disposed inside the chamber 4. A flange portion 14 is provided on one end side of the check valve 14.
a is formed, and the end face of the flange portion 14a can come into contact with an annular convex portion 2a that is formed to protrude toward the chamber 4. On the other hand, a valve guide 16 is screwed together so as to close the chamber 4, and this valve guide 16 extends in the axial direction of the through hole 1.
It has 6a. The other end of the check valve 14 fits into this through hole 16a, and its tip is exposed to the outside. A spring accommodating portion 16b is defined in the valve guide 16, and one end of the spring 18 is in pressure contact with the flange portion 14a of the check valve 14, and the other end enters the spring accommodating portion 16b to accommodate the valve guide 16. be seated inside. Therefore, one end surface of the check valve 14 is connected to the spring 18.
is brought into pressure contact with the convex portion 2a under the pressing action of the convex portion 2a, thereby closing the pressure chamber 7. Note that the pressure chamber 7
is in communication via an introduction port 19 and a passage 6 for introducing lubricating oil.

On the other hand, a hole 20 communicating with the atmosphere is bored in the main body 2 defining the circumferential surface of the chamber 8, and the chamber 8 is connected to a pilot chamber 27 via a piston 26.
is defined. Pilot chamber 27 communicates with pilot port 24 via passage 22. That is, a piston 26 is slidably disposed inside the chamber 8, and a flange portion 26a is formed at one end of the piston 26. The outer peripheral surface of the flange portion 26a including the O-ring is in sliding contact with the inner peripheral surface defining the chamber 8.

Next, a recess 28 is defined inside the piston 26, and a spring 30 is housed in the recess 28. One end of the spring 30 is in the chamber 8 and comes into contact with the end surface of an O-ring retainer 31 fitted to the main body 2, and the other end is a spring receiving plate disposed inside the recess 28. 32. A screw hole 32a is formed approximately in the center of the spring receiving plate 32,
One end of an adjustment rod 34 is screwed into the screw hole 32a. The other end of the adjustment rod 34 is connected to the pressure chamber 6.
It extends toward the side and fits into said passage 9. On the other hand, the other end of the piston 26 is bulged to form a ring-shaped protrusion 26b. The protrusion 26b is screwed into a hole of a guide member 36 which is screwed into the pilot chamber 27 so as to close it. One end of the adjustment screw 40 is screwed into the screw hole extending in the axial direction of the protrusion 26b. The other end of the adjustment screw 40 extends outward through a hole formed in the approximate center of the handle 42 that engages with the guide member 36. In this case, the other end of the adjusting screw 40 has a substantially prismatic shape, and therefore the hole formed at the approximate center of the handle 42 also corresponds to the other end of the adjusting screw 40. exhibits a shape.

In the above configuration, pilot pressure fluid is supplied from the pilot port 24 of the lubricant supply mechanism.
For example, when air is supplied, the flange portion 26a of the piston 26 receives the pressure of the air, thereby displacing the piston 26 in the direction of arrow A against the pressing force of the spring 30. Along with this, adjustment rod 3
4 is displaced in the direction of arrow A within the passage 9, passes through the pressure chamber 6, and reaches the inside of the pressure chamber 7. That is, the lubricating oil introduced in advance into the pressure chamber 7 from the introduction port 19 and stored therein is pressurized, and the pressurizing force pushes the check valve 14 disposed in the chamber 4 against the pressing force of the spring 18, as shown by the arrow. Move in direction A. As a result, a predetermined amount of lubricating oil corresponding to the amount of displacement of the adjustment rod 34 is discharged into the chamber 4, and is supplied to a machine tool (not shown) etc. connected to the outlet port 12 via the passage 10. become. Then, when the air for pilot pressure is discharged, the adjustment rod 34 is released from the spring 3.
It moves in the direction of arrow B by a pressing force of 0. Along with this, the piston 26 is also displaced in the direction of arrow B and returns to its original position.

However, in the lubricating oil supply mechanism according to the prior art, when the adjusting rod 34 returns to the original position together with the piston 26 under the pressing action of the spring 30, a temporary vacuum state, so-called cavitation, occurs in the pressure chamber 7. As a result, bubbles may be generated in the lubricating oil stored in the pressure chamber 7 and the passage 6. When the bubbles are generated, when the same operation as described above is performed to supply lubricating oil to the workpiece in the next stage, the bubbles absorb the fluid pressure generated by the displacement of the adjustment rod 34 in the direction of arrow A. Therefore, depending on the size of the bubble particles, the outlet port 1
A difference occurs in the amount of lubricating oil discharged from the outlet port 1, and the discharge amount becomes uneven.
Not only does it become impossible to obtain the desired amount of lubricating oil from the pipe 2, but in some cases, the lubricating oil may not be temporarily supplied to the machine tool or the like. This means, for example, that oil is not supplied to sliding members and the like that constitute the machine tool, and as a result, accidents such as burnout may occur due to mechanical friction. In addition, since the adjustment rod 34 functions to close the retreat path of the lubricating oil that is pressed when it fits into the pressure chamber 7 toward the introduction port 19 side, the clearance between the adjustment rod 34 and the pressure chamber 7 can be minimized. Therefore, if the lubricating oil is contaminated with impurities such as dust, the adjusting rod 34 is blocked by the impurities and becomes inoperable.

The present invention has been made to overcome the above-mentioned disadvantages, and is a lubricating oil supply device for intermittently supplying lubricating oil to machine tools, etc.
A pressure chamber that stores lubricating oil, a pressure detection sensor provided in a passage communicating with the pressure chamber, and a check valve that communicates and closes the pressure chamber and an outlet port;
A piston that presses lubricant oil stored in the pressure chamber and a valve body that blocks an introduction port that introduces the lubricant oil into the pressure chamber are provided, and the valve body presses the lubricant oil stored in the pressure chamber. When the oil is pressed by the piston, the introduction port is closed by the pressure, while the pressure sensor reliably detects whether or not the lubricating oil, which is an incompressible fluid, is being discharged. A lubricating oil supply device with a pressure sensor that monitors whether or not the supplied lubricating oil is accurately and reliably delivered to external equipment to avoid accidents such as burnout in the external equipment. The purpose is to provide.

In order to achieve the above object, the present invention is a supply device for intermittently supplying a predetermined amount of lubricating oil to equipment, etc., wherein the supply device is provided inside the main body and stores the supplied lubricating oil. a first valve body that opens and closes the pressure chamber and the lubricating oil outlet port, a second valve body that opens and closes the pressure chamber and the lubricating oil introduction port, and a second valve body that moves forward and backward with respect to the pressure chamber. It consists of a movably arranged piston that presses lubricating oil stored in the pressure chamber during forward movement, and a semiconductor pressure sensor installed in a passage communicating with the pressure chamber, and the pressing action of the piston At the same time, the second valve body closes the introduction port, and the first valve body opens to supply a predetermined amount of lubricating oil in the pressure chamber to equipment etc. through the outlet port, and the semiconductor pressure sensor is characterized in that it is configured to detect pressure fluctuations of lubricating oil within the pressure chamber.

Next, preferred embodiments of the lubricating oil supply device with a pressure sensor according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, reference numeral 50 indicates a lubricating oil supply device with a pressure sensor according to the present invention, and the supply device 50 includes a main body portion 52. The main body part 52 has a chamber 54 formed at one end thereof, a pressure chamber 56 communicating with the chamber 54 and defined approximately at the center of the main body part 52, and a pressure chamber 56 formed at the other end thereof. It has a chamber 58. A passage 60 is defined between the pressure chamber 56 and the chamber 58.

A lubricating oil outlet port 62 is formed on the circumferential surface defining the chamber 54 . A check valve 64 is disposed in the chamber 54, and a flange portion 64a is formed at one end of the check valve 64. A valve guide 66 is screwed onto the main body portion 52 so as to close the chamber 54 . A hole 66a is formed in the valve guide 66 so as to extend in the axial direction, and the other end of the check valve 64 is fitted into the hole 66a, and its tip is exposed to the outside. Further, a spring 68 is fitted onto the check valve 64. One end of the spring 68 is in contact with the flange portion 64a, and the other end is in contact with the valve guide 64.
Abuts against one end surface of 6. Furthermore, the flange portion 6
A recess 64b is formed in the end surface of 4a, and a sheet member 7 made of an elastic member is inserted into the recess 64b.
0 is installed. The sheet member 70 is the pressure chamber 5
A protrusion 5 annularly protruding from the end of 6 toward the chamber 54 side.
2a, thereby closing the chamber 54 and the pressure chamber 56 under the pressing action of the spring 68.

The pressure chamber 56 communicates with a chamber 76 defined by the base 74 through a hole 72 defined in the main body 52 . A disk-shaped check plate 78 is loosely fitted into the chamber 76, and a lubricating oil introduction port 80 and a passage 81 communicating with the chamber 76 are defined in the base 74. Therefore, it is easily understood that the check plate 78 opens and closes the passage 81 to control the introduction and discharge of lubricating oil from the introduction port 80. In the normal state, it is preferable that the check plate 78 closes the passage 81 by its own weight. Therefore, it is preferable to dispose the check plate 78 vertically below the main body 52.

On the other hand, a piston 82 is slidably disposed in the chamber 58, and one end of the piston 82 has a small diameter to form a rod 83.
3 fits into a passage 60 communicating with the pressure chamber 56 and faces the pressure chamber 56, and the piston 8
A flange portion 82a is formed on the other end side of 2.
A circumferential groove 82b is formed on the outer circumferential surface of the flange portion 82a, and a packing member 84 is formed in this circumferential groove 82b.
is engaged. As a result, in the chamber 58, the pressure chamber 56 and a pilot chamber 87, which will be described later, are airtightly separated. In this case, the chamber 58
The pressure chamber 56 side is communicated with the atmosphere through a hole 86. A pilot chamber 87 is defined between the piston 82 and a bonnet, which will be described later, on the other end surface of the main body 52 of the chamber 58, and the pilot chamber 87 communicates with a pilot port 90 via a passage 88. Further, one end side of a spring 92 that engages with the piston 82 is in contact with the side surface of the pressure chamber 56 of the flange portion 82a, and the other end side of the spring 92 is in contact with an end surface defining the chamber 58. ing.
On the other hand, the other end surface of the flange portion 82a is formed to be inclined, and defines a recess 82c approximately in the center thereof, into which a cushion member 94 made of a ring-shaped elastic body is fitted.

In fact, the pilot chamber 87 is hermetically closed by a bonnet 98 that fits into the main body portion 52. In this case, the other end of the bonnet 98 has a small diameter and protrudes from the main body 52. A handle 100 is fitted onto the other end of the bonnet 98 so as to surround the bonnet 98. In this case, a plurality of recesses 102 are formed on the outer circumferential surface of the bonnet 98 so as to extend in the radial direction, and the recesses 102 have a spring 104 and the handle 100 under the pressing action of the spring 104. A steel ball 106 is provided that contacts the inner peripheral surface. Note that a hole 108 is bored in the bonnet 98 and extends in the axial direction thereof, and a threaded groove 108a is threaded on one end side of the hole 108. A guide member 110 is fitted into the hole 108, and in this case, the threaded groove carved in the guide member 110 corresponds to the threaded groove 108a of the bonnet 98.
It is screwed together. Holes 110a having different diameters are formed in the guide member 110 so as to extend in the axial direction, and a rod-shaped indicator 114 is slidably fitted into the small diameter portion of the hole 110a. Note that one end of the indicator 114 is in contact with the piston 82.

On the other hand, a screw guide 112 is screwed into the large diameter side of the hole 110a. The other end side of the screw guide 112 has a substantially hexagonal column shape, and projects outward through a hole 100a formed in the handle 100 corresponding to the shape of the screw guide 112. . The screw guide 112 is provided with a hole 112a that passes through the screw guide 112 in its axial direction. The indicator 114 fitted in the hole 110a is exposed to the outside of the screw guide 112 through the hole 112a, and one end side of a spring 118 fitted onto the indicator 114 comes into contact with one end surface side of the indicator 114. Further, the other end side of the spring 118 comes into contact with one end surface of the screw guide 112.

Therefore, in the lubricating oil supply device configured as described above, in the present invention, the pressure detection body 120 is made to face the pressure chamber 56 defined in the main body portion 52. In this case, although the figure schematically discloses the structure,
In fact, it is preferable to arrange the pressure detector 120 at a lower position than the horizontal position of the main body 52, since even if air bubbles are generated in the passage 130, which will be described later, the problem can be minimized. . Therefore,
As can be easily understood from FIGS. 2 and 3, the pressure detection body 120 is composed of a diffusion type semiconductor pressure sensor 121 that utilizes a piezoresistance effect. That is, a diffusion strain gauge is essentially formed on a wafer, and the wafer is etched to form a thin film diaphragm. This wafer is surrounded by a housing 122, and a tube body 124 made of a hard elastic member extends downward from the lower surface side of the housing 122. A predetermined number of terminals 126 extend upwardly from the sides of the housing 122 and serve to derive an output signal from the diffusion strain gauge, ie, essentially a bridge circuit.

On the other hand, a passage 128 is formed in the main body portion 52, and this passage 128 is in communication with the pressure chamber 56. Therefore, when the pipe body 124 enters the passage 128, the lubricating oil stored in the pressure chamber 56, which will be described later, reaches the diaphragm constituting the pressure detection body 120 directly from the internal passage 130 of the pipe body 124. It turns out.

In the figure, reference numeral 150 indicates an O-ring provided at each location to prevent leakage of lubricating oil, air, etc.

The lubricating oil supply device with a pressure sensor according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, the amount of lubricating oil discharged from the outlet port 62 is adjusted in advance by rotating the handle 100. In this case, the handle 1
00 is tensilely displaced from the position shown by the solid line to the position shown by the two-dot chain line in FIG. Next, when the handle 100 is rotated, the screw guide 11
The guide member 110 is screwed through 2. The piston 82 is displaced in the direction of the arrow C or the direction of the arrow D under the spiral action of the guide member 110. For example, when the handle 100 is rotated clockwise, the guide member 110 that is threadedly engaged with the screw guide member 112 is rotated, and since this guide member 110 is threadedly engaged with the fixed bonnet 98, Eventually, the tip of the guide member 110 presses the cushion member 94 and displaces the piston 82. By adjusting the amount of displacement of the piston 82 in advance in this manner, the amount of lubricating oil discharged from the outlet port 62 can be adjusted.

After adjusting the amount of displacement of the piston 82 in advance as described above, the handle 100 is returned to the position shown by the solid line in FIG.

Next, a pilot pressure fluid, such as compressed air, is supplied to the pilot chamber 87 from a supply source (not shown) connected to the pilot port 90. The pressure of the compressed air supplied to the pilot chamber 87 generates a load on the piston 82 that tends to move the piston 82 in the direction of arrow D, and this load resists the pressing force of the spring 92 and causes the piston 82 to move in the direction of arrow D. 8
2 in the direction of arrow D. As the piston 82 moves, the rod 83 of the piston 82 projects into the pressure chamber 56. In this case, an incompressible fluid, that is, lubricating oil, is stored in the pressure chamber 56 in advance to be supplied to a machine tool (not shown) by a lubricating oil supply source (not shown) connected to the introduction port 80. , this lubricating oil reaches the semiconductor pressure sensor 121 via the passage 130.

Therefore, as the rod 83 of the piston 82 projects into the pressure chamber 56, the pressure chamber 5
The lubricating oil stored in 6 is pressurized, and the check plate 78 is pressed downward in the figure to close the introduction port 80 and press the semiconductor pressure sensor 121 due to this fluid pressure. On the other hand, a check valve 64 which closes off the pressure chamber 56 by the fluid pressure inside the pressure chamber 56
A load is generated that attempts to move the object in the direction of arrow D. This load displaces the check valve 64 in the direction of the arrow D against the pressing force of a spring 68 disposed in the chamber 54 and pressing the check valve 64 in the direction of the arrow C. Eventually, the pressure chamber 56 and the outlet port 62 are brought into communication, and a predetermined amount of lubricating oil is supplied from the outlet port 62 to the machine tool or the like in accordance with the amount of displacement of the piston 82.

In this case, by monitoring the supply of the pilot pressure and the output of the semiconductor pressure sensor 121, it is possible to determine whether lubricating oil is being reliably supplied to the machine tool or the like. That is, if an output signal from the semiconductor pressure sensor 121 is obtained when pilot pressure is supplied, this means that pressure fluctuation has occurred in the pressure chamber 56 and lubricating oil has been discharged from the outlet port 62. On the other hand, if no output signal from the semiconductor pressure sensor 121 is obtained even when the pilot pressure is applied, there is no pressure fluctuation in the pressure chamber 56 and no lubricating oil is discharged. Note that the operating state of the piston 82 can be confirmed from the outside by the amount of displacement of the indicator 114. That is, when the piston 82 moves in the direction of arrow D, the indicator 114 is displaced in the direction of arrow D by the spring 118, and therefore,
Enter the inside of the screw guide 112. It can be confirmed that the piston 82 is actually operating due to this action.

After a predetermined amount of lubricating oil is supplied to the machine tool from the outlet port 62 as described above, the pilot pressure air is discharged from the chamber 87. As a result, the piston 82 is displaced at a relatively high speed in the direction of arrow C by the pressing force of the spring 92, and the cushion member 9 is fitted onto the other end surface of the piston 82.
4 and the guide member 110 come into contact with each other, and the piston 82 returns to its original position. At the same time, the check valve 64 is displaced in the direction of arrow C under the pressure of the spring 68 to close the pressure chamber 56 again. Further, the check plate 78 is sucked upward when the piston 82 returns to its original position, and thereby the introduction port 80 and the pressure chamber 56 are brought into communication, and new lubricating oil is introduced into the pressure chamber 56 from the introduction port 80. It will be replenished.

As described above, according to this embodiment, the piston 8
2 is moved into the pressure chamber 56 by the displacement operation in the direction of arrow D.
The lubricating oil stored inside is pressed, and this pressing force causes the check plate 78 to open the introduction port 80.
At the same time, the check valve 64 is pressed to communicate the pressure chamber 56 and the outlet port 62, thereby supplying a predetermined amount of lubricating oil to the machine tool. Moreover,
When the lubricating oil, which is an incompressible fluid, is pressed under the action of the piston 82, it is detected by a semiconductor pressure sensor 121 that is sensitive to minute pressure fluctuations.
Therefore, based on this detection signal and the pilot pressure application signal, it is possible to reliably determine whether or not lubricating oil is substantially being supplied to the machine tool or the like. As a result, it becomes possible to avoid burnout accidents and the like caused by running out of lubricating oil in machine tools and the like. Furthermore, when the piston 82 returns to its origin, the check plate 78 is sucked and the introduction port 80 is
The check valve 64 is configured to close the pressure chamber 56 again when new lubricating oil is supplied from the lubricant. Furthermore, even if some impurities are mixed into the lubricating oil stored in the pressure chamber 56, the operation of the piston 82 will not be inhibited, and therefore, a predetermined amount of lubricating oil can always be reliably supplied to machine tools, etc. It becomes possible to do so.

As described above, according to the present invention, in a lubricating oil supply device that intermittently supplies a predetermined amount of lubricating oil to a machine tool, etc., lubricating oil is introduced into a pressure chamber that stores the lubricating oil and the pressure chamber. A valve body for opening and closing the introduction port is disposed between the introduction port and the introduction port. For this reason, cavitation that occurs when the piston moves back is prevented, thereby eliminating the generation of bubbles, and preventing malfunction of the piston due to impurities mixed in the lubricating oil. Furthermore, a semiconductor pressure sensor that is sensitive to minute pressure fluctuations is placed in the passage communicating with the pressure chamber. As a result, by using the lubricating oil supply device with a pressure sensor according to the present invention, it becomes possible to always accurately and reliably supply a predetermined amount of lubricating oil to machine tools, etc. Since the presence or absence of lubricating oil supply can be confirmed by the input signal of the semiconductor pressure sensor arranged, there is an advantage that unexpected accidents and failures of machine tools etc. can be avoided as much as possible.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design are possible without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted vertical sectional view showing a lubricating oil supply device according to the prior art, Fig. 2 is a longitudinal sectional view of a lubricating oil supply device with a pressure sensor according to the present invention, and Fig. 3 is an external appearance of a semiconductor pressure sensor. FIG. 50... Supply device, 56... Pressure chamber, 62...
Outlet port, 64...Check valve, 76...
Chamber, 78...Check plate, 80...Introduction port, 82...Piston, 98...Bonnet,
100...handle, 110...guide member, 1
12...Screw guide, 114...Indicator, 121...Semiconductor pressure sensor.

Claims (1)

[Claims for Utility Model Registration] (1) A supply device for intermittently supplying a predetermined amount of lubricating oil to equipment, etc., where the supply device is provided inside the main body and stores the supplied lubricating oil. A pressure chamber, a first valve body that opens and closes the pressure chamber and the lubricating oil outlet port, a second valve body that opens and closes the pressure chamber and the lubricating oil introduction port, and a second valve body that moves forward and backward with respect to the pressure chamber. It consists of a freely disposed piston that presses lubricating oil stored in the pressure chamber during advancement, and a semiconductor pressure sensor installed in a passage communicating with the pressure chamber, and under the pressing action of the piston. The second valve body closes the introduction port, and the first valve body opens to supply a predetermined amount of lubricating oil in the pressure chamber to equipment etc. through the discharge port, and the semiconductor pressure sensor A lubricating oil supply device with a pressure sensor, characterized in that it is configured to detect pressure fluctuations in lubricating oil within the pressure chamber. (2) Utility Model Registration Scope of Claim 1. The lubricating oil supply device with a pressure sensor, in which the semiconductor pressure sensor is provided horizontally below the main body.