JPS60129410A - Limit valve device for cylinder - Google Patents

Abstract

PURPOSE:To make the external shape of a cylinder small and prevent the malfunction of a limit valve by providing an operating rod connected to the limit valve body and able to freely come out and go in, on the inner wall surface of the cylinder main body. CONSTITUTION:A valve chest 12 for accommodating a valve body 11 of a limit valve 2 is formed in a cylinder body 8, and an operating rod 13 connected to the valve body 11 and able to freely come out and go in is provided on the inner wall surface of the cylinder body 8. When a piston 7 contacts to or parts from the operating rod 13 the limit valve 2 is changed over through the operating rod 13. Since the limit valve 2 is incorporated in the cylinder body 8 the limit valve 2 does not cause malfunction due to sticking of foreign materials to it and the overall external shape of the cylinder can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder limit pulp device used for detecting the operation of a clamp cylinder and other cylinders provided in a welding jig.

Conventionally, it is known that a limit valve connected to a dock attached to the piston point extending from the cylinder is installed outside the cylinder to detect the operation of the cylinder. The external size of the entire cylinder including the valve becomes large, and the weld span ★, dust □, etc. adhere to the limit valve, which is likely to cause malfunction.

SUMMARY OF THE INVENTION In order to eliminate this inconvenience, the present invention aims to provide a device in which a cylinder with limit pulp is built in. A valve chamber is formed to accommodate the valve body, and an operating column is provided on the inner wall surface of the cylinder body that can freely move in and out of the valve element, and when the piston approaches and leaves the operating rod, the limit is moved through the operating rod. It is characterized in that the valve can be switched.

Next, the present invention will be explained with reference to the illustrated embodiments.

Referring to FIGS. 1 to 3, (1) shows a clamp cylinder that operates a clamp part (not shown), (2) shows a limit pulp that detects the operation of this cylinder (1), and shows the limit pulp. The valve (2) is connected to a switching cylinder (4) for a signal switch (4) provided in the control section (3) as shown in Fig. 3.
5), the switch (4) is turned on and off via the switching cylinder (5) by the switching operation of the 1J valve (2), and an electrical signal for sequence control is provided. was made to occur.

The cylinder (1) has a piston (7) as shown in FIG.
The cylinder body (8) containing the piston (7) is equipped with a first fluid boat (9) connected to the chamber in front of the piston (7) and a second fluid boat α connected to the chamber behind the piston (7). Beau) ＋
According to the introduction of fluid pressure from the piston (the force advances and the clamping action and the first fluid bow) (9), the piston (7) is moved back to provide an unclamping action.

According to the present invention, a valve chamber aa for accommodating the valve body αυ of the limit pulp (2) is formed in the cylinder body (8), and the valve chamber aa is connected to the valve body αυ on the inner wall surface of the body (8). The limit pulp (2) is provided with an operating rod α3t which can freely come out and retract, and when the piston (7) approaches and separates from the operating rod (13), the limit pulp (2) is fully switched via the nuclear operating rod Q3. The rear end wall (8a) of the main body (8) has a valve chamber having a first bow (14) on the peripheral side, a second bow (051) on the other side, and a third bow (1119) at the rear end in the axial direction. (121 is formed, and the first boat A4 is a signal pressure inlet port,
2nd boat a 4th outlet boat, 3rd boat)
Qf9 is configured as an exhaust port, and a valve body aυ that opens and closes a communication portion between the first boat I and the second boat Is (Is) is biased toward the front closing side by a spring 0D. At the same time, an operating rod α3) extending forward coaxially with the valve body 0υ is made to protrude forward from the inner wall surface of the rear end m (8a), and it is moved backward against the spring (18). According to the movement lever (retraction of r3), the stepped part (13m) on the movement lever Q3 comes into contact with the front surface of the valve body αD, and the valve body aυ is moved to the rear opening side. so that it is pushed by
Furthermore, the rear end of the operating rod is passed through the valve body aυ, and a communication hole αIt- is formed in the rear end to communicate the second boat a9 and the third boat 061, and the operating rod (In the protruding position of 13, the two ports QHI are communicated through the communicating hole Q9t), but in the retracted position, the opening of the communicating hole (lIO front is inserted into the valve body aυ and closed, Both ports a
! Communication with 9αe was cut off.

Next, to explain its operation, cylinder (1,,) glue? During shive operation, the operating rod is in the protruding position as shown in Figure 1, and the limit pulp (2) is cut off from communication with the first boat I and the second boat A. The signal switch (4) is held in the OFF state, but according to the unclamping operation of the cylinder (1), the operation lever is in the lower closed position in FIG. A3 is pushed by the piston (7) and immersed as shown in the second port 5, and the limit pulp (2) is connected to the second port 09 and the fifth port) (
11) and the second boat α field are switched to the upper open position in Fig. 3, and signal pressure is supplied to the switching cylinder (5). The signal switch (4) is turned on and an unclamp signal indicating completion of the unclamp operation is generated.

FIGS. 4 to 7 show an embodiment in which a clamp signal indicating the completion of the clamp operation can be obtained in addition to the above-mentioned embodiment, and the unclamping signal is sent to the control section 1 (3) as shown in FIG. In addition to the switch (4), a clamping signal switch (4) is provided, and the signal pressure circuit (6) is equipped with a limit pulp (2) similar to that of the above embodiment and a second limit pulp (I) on the upstream side thereof. ) was interposed and incorporated into the front end wall (8b) of the 2It cylinder 1 main body (8).

To explain this in more detail, the limit, pulp 01,
In the valve 11 (21) formed in the front end wall (8b), there is a valve body t24 that opens and closes the communication portion between the inlet port (2) and the outlet port (c), which is opened in the axial direction of the valve 11 (21).
is biased toward the rear closing side by a spring (c), and an operating rod (2) connected integrally to the valve body (to) is attached to the front end wall (a).
b) so as to protrude freely from the inner wall surface of the operating rod (to);
When the valve is retracted, the valve body (to) is pushed toward the front opening side against the spring (2ω) (27J, as shown in No. 6FA) (1) the second fluid baud that provides a clamping action) (II
A limit pulp (8a) is installed on the rear end wall (8a) of the cylinder body (8) through the passage (C) as shown in FIG. 2) connected to the third boat (161).
In this case, the first port (I) of the limit pulp (2) on the rear end wall (B&) is an exhaust boat, and the second port 09 is an outlet boat connected to the switching cylinder (5). ) indicates the outer surface of the valve chamber (2I) 〇 Next, to explain its operation, the second fluid bow of the cylinder (1)) (fluid pressure is introduced from 11 and clamped by the movement of the piston (7) When the operation is applied, upon completion of the clamping operation, the piston comes into contact with the operating rod of the limit pulp on the front end wall (8b), opening the limit pulp and opening the second fluid. The fluid pressure from the key α is supplied to the fifth port (field) of the limit pulp (2) of the rear end wall (8&) through the limit pulp (a), and at this time, the limit pulp (2) 6 boat 0! and 2nd boat a
9, this fluid pressure is supplied to the switching cylinder (5) via the limit pulp (2), and the forward movement of the cylinder (5) causes the clamping signal switch (4) to be activated. It is turned on and a clamp signal is generated.

Also, according to the unclamping operation of the cylinder (1), the piston (7) first releases the limit pulp el on the front end wall (8b).
At the same time, the histone valve (1J) is closed by moving away from the operating rod, and the histone (7) is closed upon completion of the unclamping operation.
) is the operating rod Q of the limit pulp (2) on the rear end wall (8 &)
3), the limit pulp (2) cuts off the communication between the second and third ports (15) αe and the first and second ports) (
141 (1!9 Th) is switched to the closed position where it communicates, the fluid pressure sealed in the switching cylinder (5) is released from the first boat (14) which is the exhaust boat, and the switching cylinder (5) returns to its old position. The unclamp phase signal switch (4) is turned on and an unclamp signal is generated.

Figures 8 to 10 show an intermediate partition wall (8a) t' sandwiched between the cylinder body (8) and pistons (7)' mounted on both sides.
All embodiments are shown in which a limit pulp wire is installed in the partition wall (80) to detect the operation of the double cylinders (1) provided in pairs, and an unclamp provided in the cylinder body (8) in the partition wall (80). A valve chamber c13) having an inlet port on the axial side connected to the first fluid mate (9) for operation, an intermediate outlet port connected to the switching cylinder (5), and an exhaust port on the other side. 'tl-form and close the inlet boat (to) inside it.
A first valve body (goods) on the side, a second valve body (end) on the other side having a valve hole (35a) connected to the exhaust boat 0'z, and an intermediate valve body facing the second valve body In addition to accommodating the three valve bodies of the partition wall (8a')', on the inner surface of one side of the partition wall (8a')' there is a first operating rod C (first operating rod 0D behind 41) and an inner wall surface of the other side. A second operating lever connected to the second valve body is protruded so as to be freely retractable, and springs C1l on both sides of the third valve body 06) are connected to the third valve body 06).
(4 (by I, the first valve body 04) and the second valve body 0j and 0
Next, to explain its operation, a pair of pistons (71 (7) are supported elastically between the cylinder bodies (8) and
When fluid pressure is introduced into each first fluid port (9) on both sides of the piston (9), the piston (7) is moved backward toward the partition fl (80) and an unclamping operation is applied.
) come into contact with the first operating lever and the second operating lever, and each operating lever 0D (to) contacts the partition wall (8c) as shown in FIG.
At the same time, the second valve body (351) and the third valve body (G) are joined, and the valve hole (35a) leading to the exhaust boat C13 is opened. Blocked, inlet boat and outlet port) C3
11, the limit pulp ■ is switched from the T closed position shown by A in FIG. 10 to the open position shown by B, and the limit pulp □
・The fluid pressure from the 1 fluid boat (9) is transferred to the switching cylinder (5
), and an unclamp signal is generated from the signal switch (4).

In this case, if both pistons (71(7)) are not retreated to the unclamping completion position, the second valve body (351 and third
The valve body (36) is not joined to the valve body (36), and the first valve body C (41) is pushed toward the opening side and the valve chamber (
Even if fluid pressure is introduced into the valve hole (35a)
In other words, the limit pulp rod is in the switching state shown by a in FIG. 10, no fluid pressure is supplied to the switching cylinder (5), and no unclamping signal is generated.

As described above, according to the present invention, a valve chamber for accommodating a limit pulp valve element is formed in the cylinder body, and a retractable operating rod connected to the valve element is provided on the inner wall surface of the cylinder body, so that the piston can be moved. The limit pulp is switched via the operating rod by approaching and separating from the operating rod, and the limit pulp is built into the cylinder, preventing valve malfunction due to adhesion of foreign matter such as welding spatter and dust. is prevented,
Moreover, it has the effect of reducing the size of the entire device.

[Brief explanation of drawings]

Fig. 1 is a cut side view of one example of the device of the present invention, Fig. 2 is a cut side view of the main part of the device in its operating state, Fig. 3 is its circuit diagram, and Fig. 4 is an end face of a cylinder of another embodiment. Figures 5 and 6
The figures are V-V line and W-1441 in Figure 4, respectively. FIG. 7 is a cut-away side view, FIG. 7 is a cut-out side view of another embodiment, FIG. 9 is a cut-away side view of the main part in its operating state, and FIG. 10 is a circuit diagram thereof. Yes (1)...Cylinder (7)...Piston (8)
...Cylinder body 12) (2113@...Limit pulp aua4c<ea51m-+ Body (13(2)) (Arrogant...Valve chamber<II tm f37) (18...2nd person outside the operating rod Figure 4 Figure 6 Figure 0 Figure 5

Claims (1)

[Claims] In a cylinder equipped with a limit pulp that detects its operation, a cylinder body containing a piston forms a valve chamber for accommodating a valve body of the limit pulp, and the valve body 5 is connected to the inner wall surface of the cylinder body so that it can freely protrude and retract. 1. A mitt pulp equipment tray for a cylinder, characterized in that an operating rod is provided, and the valve is switched via the operating rod by moving the piston toward and away from the operating rod.