JPS58124807A - Double-acting cylinder - Google Patents

Abstract

PURPOSE:To provide a double-acting cylinder which can shorten the interval of switching from a going motion to a returning motion by dividing a circular space disposed in a cylinder cover with a flexible film. CONSTITUTION:When a piston 106 comes to a stroke end, and the pressure in a S-chamber increases, the piston 106 and a piston rod 104 decelerate. At this time, a flexible film 126b is opened to keep the pressure in the S-chamber. Meanwhile, the piston 106 and the piston rod 104 come to the stroke end to be stopped. Subsequently, an electromagnet 116 is excited to lower an adsorption piece 114 and a brake shoe 113, thereby to fix the rod 104. After that, pilot valves 130a, 130b are opened to the atmosphere, so that residual air in the rooms R and S is discharged to the air. The pilot valves 130a, 130b are closed to fill a constant- volume air reservoir 119 with compressed air, so taht the piston 106 and the rod 104 are moved to the left.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-acting cylinder used to open and close a high-speed shutter, etc. of a neutral particle injection device for nuclear fusion.

As shown in Figure 1, the current double-acting cylinder used for the above-mentioned purposes consists of a casing (1), a cylinder lid (2g) (2A), a piston rod (4), and a screw.
(61, Locking device [1, Air supply C1 (17a) (17h
), pressure air reservoir α on-off valve (19α) (19j &
), exhaust port (20α) (fiOj), exhaust pipe C21
G) C214), on-off valves (22A), relief valves (23α) (237), etc. are main g!
k closed, open only the left opening/closing valve (l1g), and supply a fixed amount of air into the left pressure chamber (of the pressurized casing (1) in II), and the piston rod ( 4) to the right and connect the piston rod (
5) Operate the shutters connected to K and lock the locking device QIK.
to stop the movement of the piston rod (4), and open both on-off valves (
22g) (22A) and both exhaust pipes (21α) (21
A) The pressure chambers (R) on both sides of the piston (β) are communicated with the atmosphere through It is a double-acting type that moves the rod back to the left and returns the shutter to its original state.

In order to quickly bring the pressure chamber (C) (Sl) to atmospheric pressure and reduce the resistance when switching the stroke of the piston, the exhaust path (21ri (21j) from both pressure chambers to the on-off valve (22aS22A) K
) should be made as large in diameter as possible, and the on-off valve <226)C22
k) has also been increased.

However, in the conventional double-acting cylinder as described above, the exhaust path from the pressure chamber to the on-off valve is long and its large diameter is limited, and the response time of the valve itself (time to open and close) is long. Therefore, it is not effective in spite of the increased cross-sectional area of the exhaust passage, it becomes difficult to shorten the switching time interval between the forward and backward movements of the piston, and the piping system becomes larger and a relief valve is required. There are drawbacks such as the inability to make the device more compact.

The present invention solves the above-mentioned difficulties in conventional double-acting cylinders, and includes a cylindrical casing, a piston that is slidably inserted into the casing and partitions the inside of the skeleton casing into two pressure chambers. , a cylinder lid provided at both ends of the casing and provided with an air supply port to the pressure chamber; and a slidable piston rod that is installed through the piston and passes through the cylinder lid in an airtight manner; An annular space provided in the cylinder lid is divided by a flexible membrane into an annular e-pilot pressure chamber and a valve chamber, and communicates with the pilot pressure supply path of both the pilot pressure chambers. The feature is that the pressure chamber and the exhaust port are communicated through a radial passage provided in the cylinder lid, and its purpose is to shorten the switching time interval between forward and backward operations. In addition, the piping and valves are made more compact or omitted, thereby providing a double-acting cylinder that is compact as a whole.

The present invention has the above-described configuration, in which the annular space provided in both cylinder lids is divided into an annular pilot pressure valve and a valve chamber by a flexible membrane, and one pilot pressure chamber is connected to a pilot pressure supply path. Both valve chambers communicate with the pressure chamber and the exhaust port through radial passages provided on the cylinder lid, so the valve on the atmosphere opening side is formed inside the cylinder 1 and its passage cross-sectional area is extremely large. and the part is close to the pressure chamber, and the flexible chain immediately opens and closes the valve chamber with pilot pressure, so that the pressure chamber is opened to the atmosphere and the valve opening and closing operations are suppressed, and the movement of the piston is The switching time interval for the return operation is greatly shortened, and the cylinder performance is significantly improved.

Further, in the present invention, the valve on the atmosphere opening side is composed of an annular valve chamber provided in the cylinder ring and a flexible chain body disposed so as to cover the annular valve chamber and operated by the pilot pressure. Therefore, the size of the valve chamber can be easily changed by the annular diameter of the annular valve chamber. This valve has a short response time, and also functions as a relief valve.

Saratrap, the real deal! In No. 1, an atmosphere-release valve is provided in the cylinder lid, and a relief valve in the armpit is not required, and the piping system is simple, making installation extremely compact.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In addition, in the explanation, the symbol <6) is attached to the left a
The symbol s (h> indicates the structure on the right side.

An embodiment of the present invention is shown in FIGS. 2 and 3, and (10
1) is a double-acting cylindrical casing, (102α) (10
27) is a cylinder lid that is disposed at both ends of the casing (10) and has a built-in pressurized air supply port (118a8118j) and a valve on the atmosphere release side (described later); (106) is a cylinder lid that is disposed at both ends of the casing (10
The piston (104) is slidably inserted into the casing (101) and divided into two pressure chambers (R) f3) (hereinafter referred to as R chamber and S chamber).
06) and the cylinder lid (102α) (102
A slidable piston rod (1
03E) (1034) is the cylinder lid (102α) (1
02b) A support member that is attached to K and slidably supports the piston rod (104), (105) is a connection part to a driven body (for example, a shutter) not shown, provided at the right end of the piston rod (104), (106') is the piston (1
06) Piston ring (107) provided on the outer periphery of
(108) is a star-shaped washer, (109)
is the round nut that fixed the piston (106) to the piston rod (104), and (110) is the cylinder lid (102g).
) is a nuclear locking device (1
10) is a support member portion (111) (112) that supports the piston rod (104) in a slidable manner, an annular brake shoe (113), and a brake shoe (113) that is always pushed up to the solid line position to maintain the piston rod. (104) 2 to avoid contact with K (115), adsorption piece (1)
14) and an electromagnet (116), the electromagnet (11
6), the suction piece (114) and brake shoe (
The piston rod (113) is lowered against the spring (115) K, and the piston rod (104) is fixed.

Also, (117g) (117h) is the cylinder lid (102
g) (102 letters) Pressurized air supply port attached to K (118g)
(118A) is an air supply member, (119) is a constant volume air reservoir that stores a certain amount of pressurized air, (1208) (120j
) is a constant volume of air? 1 (119) Air supply port (118
g) A solenoid valve installed in the conduit between
) (118b) K supply.

Next, to explain both cylinder lids (102eL) (1027) and the valve structure on the atmosphere opening side provided inside them, the cylinder lid (102α) (102A) has a valve seat (121α) (12]j) and a valve structure. Lid (127s) (12
1), and the left cylinder cover (102α) has a valve seat (121) fixed to the cylinder (101) side.
1) has an annular circumferential valve seat (as shown in Figure 3).
123g) and a number of radial valve seats (122-14) extending radially on either side of the circumferential valve seat (1234).
) , (122-2g) are formed, and the circumferential valve seat (1
23, radial valve seat (122-1g) and same (122-1g)
2-21) As a result of K, a transverse V-shaped annular space (■α) as shown in Fig. 2 is formed, and a cough annular space (V
a) has a number of radial valve seats (122-1
4) Radial passageway (120) that communicated with the R room of the dextroversion from the gap.
and a large number of radial valve seats (122
A radial passageway (125 radial passages) is connected from the 24 radial space to the exhaust port.

Further, on the valve cover (127g) side, an annular space (V'g) is provided opposite to the annular space (Va) of the same shape and position as the annular space (Va) provided on the valve seat (121g) side. As shown in the figure, a rubber flexible chain body (126α) is arranged between the annular space (■α) and (v'a), and the annular space (V'g) is used as a pilot pressure chamber. (Va) is divided into a valve chamber (hereinafter referred to as the pilot pressure chamber 'G' and the valve chamber as Va).
, an atmosphere release valve is provided in the left cylinder lid (10B).

In the description, the left cylinder cover (102g) is attached.
As mentioned above, the cylinder lid (1024) on the right side has a similar valve on the atmosphere opening side, and the structure of the valve will be explained using the symbol <b>.

Furthermore, the above-mentioned cylinder lid (102g) (102A)
The pilot pressure chamber (v'su(V'A)K) is connected to pilot valves (130g) (130b)K via pilot pressure supply paths (128a) (128A), and pilot valves (1301K) (1307 ) and the fixed volume air reservoir (119) are connected to each other via a conduit K to a compressor (129) which is driven by an electric motor (131) and serves as a pressurized air supply source.

The illustrated embodiment has the structure described above,
Next, to explain its function, the solenoid valve (120α) (
1207) is closed, a constant volume air reservoir (119) K is filled with air at a predetermined pressure from, for example, a compressor (129).

When moving the piston (106) to the right, the pilot valves (130α) (130A) are opened and the atmosphere release valve provided on the cylinder lid (102) (1024) is closed.

Now, when the solenoid valve (120) is quickly opened, the pressure in the constant volume air reservoir (119) is sent to the R chamber through the air supply port (118α) and filled up.The pressure in the R chamber is , 8 Because it is higher than the interior, the piston (
106) K acts and both the piston (106) and piston rod (104) begin to move to the right.

Next, in the KR chamber, the pressure decreases as the volume increases, and in the other S chamber, the sealed air is compressed and the pressure begins to rise.Finally, the pressures in the R chamber and R chamber become equal, and the piston ( 106) and the piston rod (104) are pushed by the pressure difference, and then the pressure in the 6cs chamber becomes higher than the R chamber.
) and the driven body connected thereto (for example, the shutter), their inertial energy is absorbed by the compression work on the S chamber side, and they begin to decelerate. Furthermore, as the piston (106) approaches the strike end, the pressure in the S chamber further increases, and the piston (106) and piston rod (104) further decelerate.At this time, the flexible membrane (
126) opens (flexible membrane body (126h). When the pressure in the S chamber becomes higher than the constant pilot pressure applied to K), the pressure in the S chamber becomes higher than that. During this period, the piston (106) and the piston rod (104) reach the fourth end and stop.

Excite the electromagnet (116) with the ashes and attach the adsorption piece (114).
and the brake shoe (113) are lowered against the spring (1153K) to fix the piston rod (104).Then, the pilot valve (130, 6) is switched to open to the atmosphere, and the Exhaust residual air to atmosphere.

Next, the pilot valve (130h) is closed and pressurized air is filled into the constant volume air reservoir (119), and the next operation, that is, piston rod (106) and piston rod (104)
move to the left.

Figure 4 shows the relationship between the pressures in the R and S chambers and the amount of movement of the piston (106).
The pressure in the chamber rises to 4 kf/cm'', the piston (106) moves to the right with this pressure, and the pressure in the R chamber increases to 6 kf/cm.
The pressure in the S chamber decreases from point to point b, and on the other hand, the pressure in the S chamber increases as the piston (1
06) increases from point 0 to point d.

Further, from point d, the flexible membrane body (1264) functions as a relief valve, and the pressure shifts to one point with a constant pressure. b point and 0
Since the pilot valve (1304) is switched to the atmosphere open state 11 at the point, the pressure in the R chamber and the S chamber decreases to one point.・The pressure acting on the piston (106) K is the pressure in the R chamber until the point ! is higher and the piston (106) is accelerated, but after passing the ! point, the reverse occurs and the S chamber becomes higher and the piston (106) is decelerated.Also, the piston ring (
107) and supporting member C1o3tt) (1034) and ignoring air leakage, a, h%
f% c, area surrounded by a (starting energy) and c,
Area surrounded by d, g, f,' (brake energy)
become equal.

The piston rod (104) stops at b or gd.

In addition, the chain iron device (110) is equipped with a piston rod (1 (+4)
is stopped and then fixed as above. Therefore, the locking device (110) (brake shoe 113) is not subjected to sliding and does not wear out. Incidentally, excess or deficiency of the driving force and braking force due to friction or air leakage K can be adjusted by changing the set pressure of the constant volume air reservoir (119) and the set pressure of the pilot pressure. Further, the piston ring (117) and the support members (113g) (113h) K are made of a resin material or a metal material having solid lubricating properties.

The member and cylinder (101) or piston rod U
O4), there is some I! Although there is some air leakage, the amount is so small that it can be ignored compared to the amount of air sent from the constant volume air reservoir (119).

Furthermore, the volume of the atmosphere release valve provided in the cylinder lid (1024) (1027) is the annular valve chamber (Vt) (v
The diameter of b) (can be easily changed and enlarged by changing DJ, while the diameter of
By changing the cross-sectional shape, the volume hardly increases, and the time required for opening and closing the valve does not increase.

In the above description, the forward movement of moving to the right side was described, but since this embodiment has a substantially symmetrical structure, the backward movement can be performed by reverse operation. (Description omitted) Therefore, in the illustrated embodiment, the atmosphere release valve provided in both cylinder lids has an annular valve chamber, and the valve chamber communicates with the pressure chamber in the cylinder and the exhaust port through a radial passage. Because of the tight structure, the opening path and valve to the atmosphere are significantly large, the wrinkle expansion is close to the pressure chamber, and the wrinkle expansion is directly controlled by the flexible membrane body operated by pilot pressure. The pressure chambers (R, S) are opened and closed, the pressure chambers (R, S) are opened to the atmosphere, the valve operation becomes extremely fast, the piston and piston rod move,
The return operation switching time interval can be significantly shortened.

In addition, the atmosphere release valve can be changed in size to a wider width by changing the diameter, and also functions as a relief valve.
Furthermore, a valve is provided in the cylinder lid, eliminating the need for a relief valve and simplifying the piping system, making the entire device significantly more compact.

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such embodiments, but various modifications to the design can be made without departing from the spirit of the present invention. It is something.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional high-speed double-acting piston, FIG. 2 is a vertical cross-sectional view showing an embodiment of the present invention, and FIG.
-A sectional view of the line position device, FIG. 4 is a pressure relationship diagram of this embodiment. 101: Cylindrical casing 102'e102b Niji cylinder ti 104: Piston rod 106: Piston 118@, 118J: Air supply port 124g, 124A, 1
25g, 125A: Radial passage V' e V'':
Valve chamber (annular space) V2C-v'b: Pilot pressure chamber. Sub-agent Bentographer Shige Sekimoto 2 other people -0 (color 11)
Σ) Continuation of dct sword page 1 0 Author: Kenji Muta, Mitsubishi Heavy Industries, Ltd. Kobe Shipyard & Machinery Works, 1-1 Wadazaki-cho, Hyogo-ku, Kobe City @ Author: Hiroaki Morita, Wadazaki-cho, Hyogo-ku, Kobe City - Chome 1-1 Mitsubishi Heavy Industries, Ltd. Kobe Shipyard & Machinery Works 0 Inventor: Junzo Amano Wadazakicho, Hyogo-ku, Kobe City - Chome 1-1 Mitsubishi Heavy Industries, Ltd. Kobe Shipyard & Machinery Works

Claims (1)

[Claims] a cylindrical casing, a piston that is slidably inserted into a casing cylinder and partitions the inside of the casing into two pressure chambers;
a cylinder lid disposed at both ends of the casing and provided with an air supply port to the pressure chamber; and a slidable piston rod penetrating the piston and airtightly penetrating the cylinder lid; An annular space extending in the lid is divided into an annular pilot pressure chamber and a valve chamber by a flexible chain body, and both of the two pressure chambers are connected to a pressure supply path for the pilot foot. A double-acting cylinder 0 characterized in that the pressure chamber and the exhaust port are communicated through a dispersion-like passage provided in the cylinder lid, which is a valve chamber.