JPS6314352Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control valve return control device for a chopper or disconnector.

When a pressurized fluid is used to turn on or cut off a shear cutter, an operating valve device is used. This operating valve device is located between a piston connected to the operating rod of the breaker and the pressure fluid source, and controls the opening and closing of the flow path.

The operating valve device needs to close the circuit after a certain period of time after opening, and therefore includes a return valve element.

In order to control the return of the return valve, it is necessary to ensure an accurate operating stroke, and various measures have been taken to achieve this, but all of these require precise adjustment and dimension setting, and as a result, accurate contact surfaces cannot be achieved. It is important that it is always maintained, but it is not necessarily something that should be satisfied.

The present invention has been devised in view of the above points, and its purpose is to provide a simple and novel device that stably and reliably controls the return of the return valve element.

Hereinafter, a description will be given based on the embodiments shown in the drawings.
In FIG. 1, the operating rod 1 is connected to the movable contact part 3 of the armature and the broken part 2, and the closing operation force during the closing operation is applied via the first link 4, the second link 9, and the spring receiver 5. This is provided by the spring force of the closing spring 6 mechanically connected to the rod 1.

The cylinder 7 is connected to a pressure fluid source (not shown) via an operating valve device 8. A shell 20 in the operating mechanism 10 is a movable valve body in the operating valve device 8, in this case a movable cylindrical valve 11 that prevents downward movement and engages the valve seat 13 of the floating valve 12 provided therefor. This prevents pressure fluid from flowing into the cylinder 7. Therefore, the pressure fluid piston 1
4 is blocked, and the contactor movable portion 3 is held in the closed state by the closing spring 6.

A retainer device 15 is provided at the upper end of the operating rod 1.
(Here, it consists of a locking mechanism, a coil, and a movable core), and a long hole 16 mechanically connected to the operating mechanism 10 is provided at the lower end.

Next, the forces acting on the movable cylindrical valve 11 and the operating mechanism 10 will be explained using FIG. 2.

Now, if the downward force acting on the movable cylindrical valve 11 in the drawing is F, then the pressure of the pressure fluid inside the operating valve device at each position of the movable cylindrical valve 11 is _P1 , and the external pressure (atmospheric pressure) is P1. ₂ , the results will be as follows:

() When the cylindrical valve 11 is in contact with the valve seat 13 of the floating valve 12 (when it is stationary and when the movable cylindrical valve 11 and the floating valve 12 are both moving downward) F = (P ₁ - _{P 2} )×π/4(D ₁ ² −D ₂ ² ) () The floating valve 12 hits the stopper 18 provided on the valve body 17 and is prevented from moving downward, and only the movable cylindrical valve 11 moves downward by itself. When the cylindrical valve 11 comes into contact with the valve seat 19 provided on the valve body ₁₇ , F=(P ₁ − _{P 2} ⁾ _{× {} π/ 4(D ₄ ² −D ₁ ² )+π/4D ₃ ^2Next , a pin 20 provided in the operating mechanism 10 is provided with a counterclockwise direction via a pin 21 and a roller 22 provided at the lower end of the cylindrical valve 11. A rotational driving force T is transmitted, and this force T is calculated as T=F× if frictional resistance is ignored.
It becomes l. However, l is the axis center of the cylindrical valve 11 and the core 2
It is the eccentric distance from the rotation center of 0.

Next, the operation will be explained with reference to FIGS. 1 and 2.

Now, the shearing command is given and the shearing electromagnet 2
3 is excited, the movable iron core 24 moves downward and drives the locking pin 25 counterclockwise.

As a result, the hammer 20 is released from the locking pin 25 and rotates counterclockwise around the fifth pin 45 by the driving force T. Therefore, the cylindrical valve 11 is released from the shell 20, moves downward and separates from the valve seat 13, as shown in FIGS.
9 and self-hold in that position. As a result, the pressure fluid reaches the cylinder 7, drives the piston 14 and the operating rod 1 upward in FIG.

At this time, the pressure fluid reaches the auxiliary filling chamber 49 through the communication hole 47 provided in the movable cylindrical valve 11, but the return valve body 30 allows the return The flow into the cylinder chamber 50 is prevented.

When the movement in the cross-section direction approaches the end, as shown in FIG. The second lever 27 and the fourth lever 36 connected to the second lever 27 and the fourth lever 36 are
Move it in the direction of the arrow in the figure.

The fourth lever 36 is configured to rotate around a third pin 43, and one end is pivotally connected to the first lever 26, and the other end is provided with a third roller 38 that is freely rotatable. The second lever 27 has one end pivotally connected to the first lever 26 and the other end pivotally connected to the third lever 28. The third lever 28 rotates around the fourth pin 44, one end of which is pivotally connected to the second lever 27, and the other end of which is provided with a freely rotatable second roller 29. That is, the first lever 26, the second lever 27, and the fourth lever 36 constitute a toggle mechanism TG.

As the second lever 27 moves in the direction of the arrow (upward) in FIG. The valve body 30 is moved to the left in FIG. 4 against the force.

At this time, the upward force of the first lever 26 is increased by the toggle mechanism TG to ensure that the return valve body 30
is pushed in. However, the third lever 28 does not rotate beyond the dead center position where the three supports of the toggle mechanism TG are aligned in a straight line. Therefore, the return valve body 30 is not pushed in too much due to excessive rotation of the third lever 28, and a constant opening degree can be reliably obtained.

As a result, the pressure fluid in the auxiliary air chamber 49 flows into the return cylinder 50, acts on the return piston 32 provided concentrically with the movable cylindrical valve 11, and pushes it upward. The piston 32 is brought into contact with the shoulder 34 (see the reference numeral in FIG. 1) of the movable cylindrical valve 11 by the force of the pressure fluid against the force of the return spring 33, and is immediately moved upward in FIG. Push up until it touches the valve seat 13. First roller 22
both move upward, and the locking pin 20 and locking pin 25
is returned by the force of each return spring to maintain the movable cylindrical valve 11 in this state. At this point, pressure fluid is prevented from flowing into the cylinder 7.

The pressure fluid supplied into the cylinder chamber 7 and the return cylinder chamber 50 is led to the muffler 35 through an exhaust hole 48 provided in the movable cylindrical valve 11, and is promptly discharged to the atmosphere.

The return piston 32 is returned to the position shown in FIG. 5 by the second return spring 33 when the pressure fluid in the return cylinder chamber 50 is discharged.

Further, the operating rod 1 reaches the completely sheared position and is held in this state by the holding link device 15, and the shearing operation is completed and the state shown in FIG. 5 is achieved. Contactor movable part 3
is in a state of interruption as shown in FIG.

Next, the charging operation will be explained. When a closing command is given in the shrunk state shown in FIG. As a result, the contact movable portion 3 of the sheath section 2 moves downward and performs a closing operation.

Near the end of the closing operation, the operating rod 1 in Fig. 5
The upper end of the elongated hole 16 provided in the hole 16 contacts the first lever 26 and drives it downward, and the third lever 28 is rotated clockwise about the fourth pin 44 through the second lever 27 connected thereto. , also the third pin 4
Rotate the fourth lever 36 clockwise around 3.

As the third lever 28 rotates, the second roller 29 is separated from the return valve body 30, and the valve body 30 is returned to the position shown in FIG. The communication with the return cylinder chamber 50 is cut off.

The residual pressure fluid in the return cylinder chamber 50 is discharged to the atmosphere through the discharge path 30' along the return valve body 30. Further, as the fourth lever 36 rotates clockwise, the third roller 38 comes into contact with the fifth lever 39, and by rotating this clockwise around the second pin 42, the fourth roller 40 is rotated. It is separated from the shear car 20 and is allowed to rotate counterclockwise by the third return spring 37 in preparation for the next shear cutting command.

Note that 46 is a sixth lever provided between the first pin 21 and the movable cylindrical valve 11, 51 is a tension spring of the fifth lever 39, and 52 is a stopper of the fifth lever 39.

Although the explanation has been given above using a puffer-shaped cutter as an example, it goes without saying that the present invention can also be applied to other shapes of cutters and cutters.

According to the present invention, since the return piston is returned by pushing the return valve body using the toggle mechanism and opening the flow path, the applied driving force is increased and the previous return valve body In addition to ensuring that the circuit opens,
Since the third lever does not rotate beyond the dead center position where the three fulcrums of the toggle mechanism are aligned, the opening degree of the return valve body remains constant and the return valve body is pushed in due to excessive rotation of the third lever. On the other hand, when the return valve body reaches the closed position, the third lever separates from this return valve body and rotates further, so that the third lever can be rotated further regardless of the closed position of the valve body. It becomes possible to take the stopping position of 3 levers. In other words, the setting of the position of the first lever does not need to be very precise, and the closed position of the return valve body can be achieved reliably and stably, so that the return operation of the return piston is generally stable and reliable. It also has the advantage of being simple in structure.

[Brief explanation of drawings]

The figure shows one embodiment of the present invention, and Figure 1 is a sectional view showing the loaded state, Figure 2 is an enlarged view of the main parts in the loaded state,
Figure 3: Enlarged view of main parts showing the state of the cutting edge being interrupted, Figure 4
The figures further include an enlarged view of the main parts showing the state in which the wire is disconnected after time has elapsed, FIG. 5 an enlarged view of the main part showing the state where the wire has been disconnected, and FIG. FIG. 1: Operating rod, 3: Contactor movable part, 14: Piston, 11: Movable valve body, 26: First lever, 27:
2nd lever, 28: 3rd lever, 30: return valve body, 32: return piston, TG: toggle mechanism.

Claims (1)

[Claims for Utility Model Registration] An operating rod connected to a movable contactor part, a piston connected to the operating rod, a cylinder fitted to the piston, and a charged chamber formed by the piston and cylinder. a movable valve body that opens and closes a flow path between the valve body and a pressure fluid source; an idler valve that the movable valve body abuts near the end of its closing stroke and applies a force in the opening direction to the movable valve body; A shell that is locked and supports the force in the opening direction of the movable valve body, and a return mechanism that slides on the outer periphery of the central shaft portion of the movable valve body and operates the movable valve body in the closing direction when the movable valve body is slid a predetermined distance in one direction. a return cylinder chamber for returning the return piston; a communication hole formed in the center shaft portion of the movable valve body and having one end open toward the floating valve; and a communication hole having the other end open toward the idler valve. a return valve body which opens and closes a flow path between the auxiliary charge chamber and the return cylinder chamber and is normally closed; a first lever to which a driving force is applied at the end of the shear cutting stroke; a second lever having one end connected to the other end of the first lever; a toggle mechanism comprising a fourth lever connected to the other end of the first lever; and a toggle mechanism pivoted in the middle, one end of which is connected to the other end of the second lever, and the other end of which is connected to the return valve body. and a third lever that is opposed to the lever and operates the return valve body in the opening direction at the end of the shear breakage stroke of the operating rod to open the flow path. Control device.