JPS5822456Y2 - flow regulating valve - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement of a flow rate regulating valve.

Conventionally, for example, in a grinding machine where the table speed is adjusted using a back pressure throttle, flow rate adjustment valves are installed in each of the right and left rows, and these flow rate adjustment valves are operated individually during work. Because the left and right speeds were set at the same speed, it took time to operate.

Therefore, this invention aims to improve the operability of the machine by proposing a flow rate regulating valve that can simultaneously perform the above-mentioned regulating operations in a short time.

In other words, two flow rate regulating valves are arranged on the corner shafts, one valve shaft is provided with a straight inclined surface and a curved inclined surface, and the curved inclined surface is arranged in such a manner that the ratio of the flow rates flowing through both valves is equal to the ratio of the working area of the piston. It was formed.

Next, embodiments of this invention will be described based on the drawings.

Reference numeral 1 denotes a hydraulic cylinder, into which a piston 2 is fitted, and the other end of the piston rod 3 is connected to a driven member, such as a table.

4 is a flow rate adjustment valve, 5 is an oil passage switching valve, 6 is a pump, 9, 1
1, 12 and 14 are oil passages, 10 and 13 are bypass oil passages for flow rate adjustment valves, and 7 and 8 are one-way valves provided in bypass oil passages 10 and 13, respectively, to block the discharge side. .

20 is a valve body of the flow rate adjustment valve 4; 21 is a first throttle chamber formed in the valve body 20 so as to communicate the oil passages 9 and 11; 22 is a first throttle edge in the first throttle chamber 21; 23 is oil passage 12.1
The second throttle chamber 23 and the first throttle chamber 21 are formed on the same axis.

24 is a second throttle edge in the second throttle chamber 23, 25 is a valve shaft inserted into the valve body 20 in a tight fit state and movable in the axial direction, and 25a is a knob thereof.

Reference numerals 26 and 27 denote first and second inclined surfaces formed on the outer periphery of the valve shaft 25, which form a restriction for the oil passage in correspondence with the first and second restricting edges 22.24. 26 and 27 are formed into cylindrical surfaces having the same axis, one of which is straight and the other is curved.

The curve is formed into a shape according to the following equation, but if a certain degree of error is allowed in the case of a full range of motion, it may be practically possible to use a straight line as an approximate substitute.

In the figure, the action area of the piston 2 is Sl, S2, the area of the corresponding first throttle is A1, the area of the second throttle is A2, and the diameter when the area of the first inclined surface 26 is A1 is dl. The diameter when the area of the second inclined surface 27 is A2 is d2, the diameter of the second drawing edge 22 is Dl, and the diameter of the second drawing edge 24 is D.
2. Then, in order for the speed of the piston to move to the right and to the left to be equal, the speed of the piston rod should be ■, the flow rate through the first restriction QI, the flow rate through the second restriction Q2, and the flow speed υ. There is a need for this.

In addition, the curve of the first inclined surface 26 is represented by f (X), and the second
The inclination angle of the straight line of the inclined surface 27 is θ, the diameter of the valve stem at the distance X from the valve stem position of A1=O is dl, A2=
The diameter of the valve stem at the distance X from the valve stem position at 0 is d
2, a1=I):L −2f (X)・・・・・・・・・
・■d2 = D2-2 X tanθ, ,,,, --
--@A1=Si(Dl -dl)・・・・・・・・・
■Mu2 =”/ (D2-d2)・・・・・・・・・
■8, 2222 From formula 0 and formula ■, ■ 1” (Dl d l)/(
D2-62)・・・■ Obtain the formula from ■, ■, and ■.

In the embodiment of this invention, the first inclined surface 26 of the valve shaft 25 is a curved line and the second inclined surface 27 is a straight line, but if this is reversed, the symbol corresponding to the linear inclined surface is S2. A2.
D2. d2, and the code corresponding to the curved slope surface is S, , A
,,D,,d, the formulas are the same.

Next, the effect will be explained.

Now, when the pump 6 is activated and pressure fluid flows into the left chamber of the cylinder 1 via the oil passage switching valve 5, oil passage 10, one-way valve 7, and oil passage 9, the piston 2 moves to the right. The fluid on the right chamber side of the cylinder 1 flows through the oil passage 12, the second throttle, and the second throttle chamber 23.
, the oil passage 14 and the switching valve 5.

Next, when the switching valve 5 is switched to the right side, the pressure fluid from the pump 8 flows into the right chamber of the cylinder 1 via the switching valve 5, the oil passage 13, the one-way valve 8, and the oil passage 12.

As a result, the piston 2 moves to the left, and the fluid on the left chamber side flows through the oil passage 9, the first throttle, the first throttle chamber 21. Oil road 11. It is discharged via the switching valve 5.

Then, Therefore, the speeds of the pistons 2 are equal.

Also, by adjusting the valve shaft 25 forward or backward with its knob 25a, the areas A and A2 of the first and second throttles change, but the above curve forming the throttles satisfies equation (2). This condition is always satisfied and the speed of the piston is always the same.

As described above, in this invention, the moving speed in both directions of the movable member driven by the fluid cylinder can be adjusted to the same speed at the same time in a short time using one fluid regulating valve, so that the operation of the machine can be improved. It has the ability to improve sexual performance.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, and FIG. 1 is an explanatory diagram showing a cross section, FIG. 2 is an enlarged sectional view showing the first constriction part, and FIG. 3 is an enlarged sectional view showing the second constriction part. It is. 4...Flow rate adjustment valve, 20...Valve body, 2
5... Valve stem, 26... Curved inclined surface,
27... Linear inclined surface.

Claims (1)

[Claims for Utility Model Registration] In order to equalize the moving speed in both directions of a piston of a fluid pressure drive device in which the pistons have different action areas, a flow rate regulating valve is interposed in a flow path leading to each chamber,
Two flow rate regulating valves are integrally formed on the same axis, one of which has an inclined surface that is involved in the throttling action is a straight line, and the other is a curved line. S2, the diameter of the throttle edge for this is Dl, D2, the diameter of the slope facing the throttle edge when the valve body moves X in the opening direction from the zero flow rate position is dl, d2, the inclination angle of the straight line is θ, and S2°D2 on the aperture side of the straight inclined surface. A flow rate regulating valve characterized in that d2 is compatible.