JPS6037211Y2 - hydraulic regulator - Google Patents

Description

[Detailed description of the invention] In order to control the propulsion speed of the reciprocating body of an automatic drill unit to a desired value, the present invention provides a hydraulic system that is attached to such a reciprocating body and adjusts its feed rate. Regarding improvements to regulators.

A throttle valve is installed at the oil outlet of the hydraulic cylinder as a feed speed governor when operating a reciprocating body with a constant propulsion force.
A so-called hydraulic regulator is generally used, which controls the forward speed of the piston by adjusting the flow rate of oil on the side pressurized by the pressing force of the piston, and adjusts the feed speed by bringing the piston rond into collision with the reciprocating body. Commonly used.

By the way, as a throttle valve of such a hydraulic regulator, a needle valve or a rotary valve as shown in FIGS. 1a and 1b is generally used.

In the case of a needle valve, as shown in FIG.
By moving the needle valve 2, the gap between the needle valve 42 and the valve seat 43 is opened and closed, and the amount of oil passing therethrough is adjusted.

However, when this needle valve is used, the flow rate, that is, the piston speed increases or decreases in proportion to the cube of the lift amount of the needle valve 42, especially in a low speed range where fine adjustment is required in a drill unit, etc. In many cases, this method is not usable, resulting in damage to the tool due to incompatibility with the cutting speed, or excessive effort and time being spent on setting the cutting speed.

Therefore, in recent years, in order to compensate for the drawbacks of the needle-shaped valve, a rotary valve 5 having a groove 10 having a square cross section formed on its outer periphery, as shown in FIG. 1, has come into widespread use.

However, even in this rotary valve type, the shape of the V-groove 1G is as shown in the enlarged sectional view of FIG.
A groove 10 is continuously carved around the entire circumference.

The setting range was limited to a central angle of 1800 or less, and there was a limit to how finely the setting values could be determined.

In addition, if you try to set the piston speed in a predetermined range between the center angle 0 and 180°, the characteristic curve will be as shown by S□ in Figure 5, and the range where fine adjustment is required, shown by the diagonal line, will be very delicate. This will require significant adjustments.

This idea was created in view of the current situation as described above.
It is an object of the present invention to provide a valve manufacturing and ancillary structure that allows fine setting of feed speed to be performed more easily and accurately than in the past.

The feature of this invention is that regarding the groove provided on the outer periphery of the rotary valve, it can be set only up to a rotation angle of 180° in the past.
By allowing the rotation angle to be set within the range of 2000 to 300 degrees, it is possible to subdivide the setting values, by providing a stopcock on the rotary valve, it is easy to replenish oil, and the filter can be easily refilled. The hollow conical shape increases the filtration area and reduces filter resistance, improving performance and simplifying maintenance.

The invention will be explained by means of illustrated embodiments.

Figure 2 is an external view showing an example of the use of a hydraulic regulator.
is a drill unit, and B is a hydraulic regulator.

This hydraulic regulator B is separated from the main components of the main cylinder 1, sub-cylinder 2, main piston 3, differential piston 4 and rotary valve 5, as shown in FIG.

Now, when the drill unit A operates and the ram 101 moves forward, the bar 102 and the plate member 103 are integrally moved with the ram 101.
A collision member 104 fixed to the forward waist plate member 103 collides with the piston rod 6 protruding from the rear end of the hydraulic regulator B.

Even so, the ram 101 still tries to move forward and presses the piston rod 6 forward.

When the piston rod 6 is pushed forward, the main piston 3, which is integrated with the piston rod 6, moves forward against the spring 27, as shown in FIG.
In order to press the oil filled in the pressure oil chamber 7 and increase the filtration area, a filter 8 formed in the shape of a hollow cone is used.
The fluid passes through the inlet 9, the groove 10, the communication hole 11, the fluid passage 12, and the through hole 13, and is pushed into the oil storage chamber 14.

Here, when oil flows from the inlet 9 to the communication hole 11 via the V-groove 10, the corresponding position of the communication hole 11 and the V-groove 10 differs depending on the rotational position of the rotary valve 5. is V
The communication hole 1 passes through a passage gradually narrowed by the groove 10.
Flows to 1.

In other words, in the path through which the oil in the pressure oil chamber 7 reaches the oil storage chamber 14, the minimum flow area portion that regulates the flow rate of oil is located at a position corresponding to the V groove 1G and the communication hole 11.
The oil flow rate can be adjusted by rotating the rotary valve 5 and changing the corresponding position between the V-groove 10 and the communication hole 11.

As a result, the forward speed of the main piston 3 can be adjusted.
, the feed speed of the ram 101 can be adjusted via the bar 102.

When the pressing force of the piston rod 6 is released, that is, when the ram 101 stops and starts moving backward, the main piston 3
Since the pressing force applied to is released, the pressure in the pressure oil chamber 7 decreases.

Therefore, the spring 17 and the spring 27 press the main piston 3 and the differential piston 4 in a direction that reduces the volumes of the oil storage chamber 14 and the differential cylinder 16.

As a result, the ball valve 19, which had been pressed against the main piston 3 by the pressure in the pressure oil chamber 7, is pushed forward against the spring 20 by the pressure in the oil storage chamber 14 applied via the return passage 18, and and differential cylinder chamber 1
6 is quickly sent to the pressure oil chamber 7.

At this time, the differential piston 4 is pressed by the spring 17, and the main piston 3 is pressed by the spring 27, and oil is sent into the pressure oil chamber 7 until the pressure oil chamber 7 reaches its maximum volume.
The main piston 3 stops at the backward end position and completes one cycle.

As described above, the forward speed of the main piston 3 and the piston rod 6 is regulated by restricting the flow rate by restricting the oil in the pressure oil chamber 7 when it flows from the inlet port 9 to the communication hole 11 by VilO. However, as shown in FIG. 1C, the conventional V-groove 10 is machined by rotating eccentrically by a predetermined amount with respect to the center of the rotary valve 5. The maximum rotation angle is 180° to a certain position, and when adjusting the forward speed by rotating the grip 21, that is, the rotary valve 5, the rotation angle is 0 to 180°.
Must be set within the range.

In the present invention, as shown in FIG.
Since the rotation angle is 200° to 3000°, conventional O
The same adjustment that was set between ~1800 and 0~200
Since the value can be set between 0 and 3000, it is possible to subdivide the set value, making fine adjustment easier.

In addition, with the development of processing technology and processing machines in recent years, processing has become easier, and the cutting depth of the V-groove 10 at each position corresponding to the rotation angle can be freely designed and manufactured.
It is possible to subdivide the setting values in areas that require fine adjustment, such as the shaded area shown in Figure 5, and furthermore, it is processed to have characteristics such as S2 and S3 to make adjustment easier. It is also extremely easy to do so.

Furthermore, the rotary valve 5 is formed into a hollow cylindrical shape, and a stopper 2 is provided at the front end.
2, if there is a shortage of oil due to oil leaking outside during long-term operation, you can easily replenish the oil by simply removing the stopcock 22. There is no need to protrude to the outside or disassemble the entire valve to lubricate it.

Further, the engagement surfaces of the cylindrical body 23 and the sub-cylinder 2 are formed into a conical shape and a mortar shape, and by pressing and engaging them, the sealing on the engagement surfaces can be easily performed by a distant relative, and a separate sealing member can be attached. There is no need to provide a holder, and processing is easy.

In the above description, a case has been described in which a V-shaped groove is provided on the outer periphery of the rotary valve, but the shape of the groove is not limited to this, and may be an inverted trapezoid shape, a rectangular shape, or other shapes.

Furthermore, although the filter fitted to the rear end of the rotary valve has been described as having a hollow conical shape, it is not limited to this, and any shape may be used as long as it has a large filtration area.

As detailed above, according to the present invention, the feed rate can be easily and accurately finely adjusted, oil can be easily replenished, and processing costs can be reduced at low cost. Useful.

[Brief explanation of the drawing]

Figures 1a and 1b are vertical cross-sectional views showing the conventional valve structure, and Figure 1 is b.
Fig. 2 is an external view showing an example of the use of a hydraulic regulator, Fig. 3 is a longitudinal sectional view of an embodiment of the invention, Fig. 4 is a sectional view of the ■-■ portion, FIG. 5 is a diagram for comparing the conventional device and the device according to the present invention. 1: Main cylinder, 2: Sub cylinder, 3: Main piston, 4
: Differential piston, 5: Rotary valve, 8: Filter, 9: Inlet, 10: V groove, 11: Communication hole, 12: Fluid passage, 14
: Oil storage chamber, 16: Differential cylinder chamber, 19: Ball valve, 2
1: Nigiri.

Claims (3)

[Scope of utility model registration request] (1) By pressing the piston rod, the oil in the hydraulic chamber in front of the piston, which reciprocates integrally with the piston rod, is transferred to the rear of the piston through a throttle valve provided at the front end of the cylinder and an oil passage communicating with the throttle valve. In a hydraulic regulator having a structure in which oil is pushed out into a storage chamber provided in A fluid passage is formed and the inner diameter is expanded to form a valve body housing hole, and a communication hole is bored that communicates from the valve body housing hole to the narrow diameter portion, thereby forming a stepped valve body formed in a cylindrical shape. A groove whose cut depth gradually changes over 2000 to 300 degrees of the outer circumferential surface is formed at a position corresponding to the communication hole on the outer circumferential surface of the enlarged diameter part, and the deepest part of the groove is formed from the inner surface of the valve body. An inflow port communicating with the outer periphery is bored, and a hollow conical filter S' is fitted to the rear end of the valve body, and the step-shaped enlarged diameter portion of the valve body is connected to the valve body of the cylindrical body. A hydraulic regulator which is rotatably housed in a housing hole and has a front end portion of the valve body protruding from a front end portion of a cylindrical body. (2) The hydraulic regulator according to item 1, wherein a stopcock is screwed and fixed to the front end of the cylindrical body. (3) The hydraulic regulator according to item 1, wherein the abutment surfaces of the cylindrical body and the sub-cylinder fitted into the cylinder with a fluid passage carved therein are formed into conical shapes.