JP2007016911A - Compressed air supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressed air supply device capable of supplying predetermined compressed air to plugs when attaching plugs for a normal pressure and a first high pressure, or either one of the plugs, and a plug for a second high pressure. <P>SOLUTION: A conductive space S is formed between a primary pressure side opening 2 and a secondary pressure opening 3. A pressing part 12 capable of pressing in a first valve element 6 and a pressure receiving face receiving pressure of compressed air in the conductive space S are provided in one side of an adjustment piston 11 slidably arranged in an adjustment cylinder 4. Another side of the adjustment piston 11 constantly biases the pressing part 12 by a pressure regulating spring 15 in a pressing direction. When a second valve element 7 is operated over a certain amount of movement, an operating rod 16 can press the first valve element 6. The plug 33 for a constant pressure or a high pressure, and the plug 34 for a super high pressure can be attached to a coupler 9. When the plug 33 for a constant pressure or a high pressure is attached, the second valve element 7 is pressed in within a range not exceeding the certain amount of movement. When the plug 34 for a super high pressure is attached, the second valve element 7 can be pressed in over the certain amount of movement. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is suitable for each plug when both the normal pressure type plug and the second high pressure type plug higher than the high pressure zone or the first high pressure type and the second high pressure type plug of the normal pressure type and the high pressure zone are attached. The present invention relates to a compressed air supply device capable of supplying compressed air having a high pressure.

  As the use of high-pressure gas has been approved due to the revision of the High-Pressure Gas Control Law, the equipment used has gradually shifted to the high-pressure side. The reason is that if high-pressure compressed air can be used, high energy can be obtained even if the tool itself is compact, so that it is light and easy to handle, and it is necessary to fasten hard materials such as laminated SVL and LVL. This is because high energy is required. For this reason, the maximum operating pressure is specified as the maximum operating pressure of the second high pressure of 4 to 4.2 MPa in addition to the conventional normal pressure of less than 0.98 MPa and the first high pressure of 2.94 MPa or less. There is a hose and connected equipment attached to its tip. And from the convenience of the above-mentioned high pressure, it is predicted that such a tendency will further shift to less than 5 MPa in the future.

  On the other hand, in the past, dedicated connection devices have been used for each pressure zone. For example, a low pressure and high pressure coupler is attached to a common air compressor that is provided with a pressure reducing valve and can supply both normal pressure and high pressure compressed air, and the low pressure coupler has a low pressure plug. The nail driving machine having a high pressure plug is connected to the high pressure coupler. On the other hand, it is also known that a normal pressure plug and a high pressure plug can be connected to the same coupler.

Therefore, at present, the second high-pressure building compressor and the connecting device have not been realized. However, when this is realized, the second high-pressure compressor and the second high-pressure dedicated connecting device have not been realized. At the same time, it is necessary to be offered to the market. Then, in addition to the low pressure and the first high pressure, the second high pressure compressor and the connecting device are simultaneously put on the market.
JP 2003-90480 A

  However, if the second high-pressure compressor and the second high-pressure connection device are replaced at once for the second high-pressure, not only the manufacturer's manufacturing cost and the purchaser's expense will increase. Since those for normal pressure and the first high pressure are discarded all at once, it is not preferable in terms of environmental protection.

  The present inventors can use the conventional normal pressure and the first high-pressure plug by supplying two or three types of pressure to the second high-pressure compressed air supply device. Focused on.

  Therefore, the present invention solves the above problems and supplies predetermined compressed air to each of the normal pressure, the first high pressure plug, or any one of them and the second high pressure plug. It is an object of the present invention to provide a compressed air supply device that can perform the above.

  In order to solve the above-mentioned problem, the invention according to claim 1 is such that a primary pressure side opening communicating with a compressed air supply source is provided on one side of a housing provided in the compressed air supply device main body, and a coupler for a connecting device is provided on the other side. A secondary pressure side opening is formed, a conduction space for compressed air is formed between both openings, and the adjustment cylinder is arranged to open to the primary pressure side opening, and is slidably disposed in the adjustment cylinder. One side of the adjustment piston has a pressing part that can push the first valve body provided in the primary pressure side opening and a pressure receiving surface that receives the compressed air in the conduction space, and the other side is a pressure regulating spring. The pressing portion is constantly urged in the pressing direction, and an operating rod is disposed between the second valve body provided in the secondary pressure side opening and the first valve body, and the second valve body is fixed. The above operating rod pushes the first valve body when operating beyond the travel distance. The normal pressure or first high pressure plug and the second high pressure plug can be attached to the coupler, and when the normal pressure or the first high pressure plug is attached, the second valve body is moved. When the second high pressure plug is attached, the second valve body can be pushed beyond the movement amount when the second high pressure plug is attached.

  According to a second aspect of the present invention, a second adjustment cylinder is provided on the second valve body side of the adjustment cylinder, and a second adjustment piston slidably provided on the second adjustment cylinder and the adjustment piston are connected to each other. And connecting the operating rod through the second adjusting cylinder, and attaching a seal member for sealing the inner surface of the through hole at the bottom of the second adjusting cylinder to the operating rod, When the operating rod is operated to the extent that the seal member is removed, compressed air in the conduction space is introduced between the second adjustment piston and the bottom through the through hole, and the normal pressure is applied to the coupler. When the plug, the first high-pressure plug, and the second high-pressure plug can be attached, and the first high-pressure plug is attached, the second valve body can remove the operating rod from the seal member. , One above And characterized in that a pushable to the extent that does not exceed the amount of movement.

  According to a third aspect of the invention, instead of the connecting rod, a projecting shaft is provided on the second adjustment piston, the projecting shaft is projected into the adjusting cylinder, and a spring receiver is formed at the tip of the projecting shaft. The pressing portion is constantly urged in the pressing direction by a pressure adjusting spring disposed between the receiver and the adjusting piston.

  According to the first aspect of the present invention, when the normal pressure or the first high pressure plug is attached, the second valve body is pushed in within a range not exceeding a certain amount of movement, so that the operating rod presses the first valve body. However, since the second valve body is opened, the compressed air in the conduction space is supplied from the plug, and the pressure in the conduction space is reduced. For this reason, since the force on the pressure receiving surface of the adjustment piston becomes relatively small with respect to the pressure adjustment spring, the adjustment piston moves to the primary pressure side by the spring force, and the pressing portion pushes in and opens the first valve body, and in the conduction space. When the primary pressure is supplied to the cylinder and the pressure is increased and exceeds a predetermined normal pressure or the first high pressure, the pressure on the adjustment piston prevails and the first valve body is closed again. In this way, compressed air at normal pressure or first high pressure is supplied.

  On the other hand, when the second high pressure plug is attached, the second valve body operates over a certain amount of movement, so that the operating rod directly pushes the first valve body, and the primary pressure passes through the conduction space. Supplied to the second high-pressure plug.

  According to the inventions according to claim 2 and claim 3, when the first high-pressure plug is mounted, the second valve body is such that the seal member is removed from the operating rod and does not exceed a certain amount of movement. Therefore, the compressed air in the conduction space is introduced between the second adjustment piston and the bottom portion through the through hole in the bottom portion of the second adjustment cylinder. For this reason, since the pressure of the compressed air in the conduction space acts on the second adjustment piston, the second adjustment piston moves to the primary pressure side and presses the adjustment piston via the connecting rod. For this reason, since the pressure from the second adjustment piston and the spring force of the pressure adjusting spring act on the adjustment piston on the side opposite to the pressure receiving surface, when the first valve body is opened, this corresponds to this in the conduction space. The first high-pressure compressed air flows in and is supplied to the first high-pressure plug.

  When the normal-pressure and second high-pressure plugs are mounted, this is the same as in the case of claim 1.

  Therefore, when the normal pressure plug, the first high pressure plug, and the second high pressure plug are attached to the same coupler, the normal pressure, the first high pressure, and the second high pressure compressed air can be supplied to each. it can.

  According to the third aspect of the present invention, when the first high-pressure plug is attached, the pressure of the compressed air in the conduction space acts on the second adjustment piston, so that the projecting shaft moves to the primary pressure side together with the second adjustment piston. Since the pressure adjusting spring that moves and bends on the side opposite to the pressure receiving surface of the adjustment piston is bent, the spring force increases, and the first high-pressure compressed air corresponding to this increased spring force is supplied to the first high-pressure plug. can do. When the normal pressure plug and the second high pressure plug are mounted, the configuration is the same as that of the second aspect.

  Here, for convenience, the first high pressure in the high pressure zone will be described as high pressure, and the second high pressure in the higher pressure zone will be described as ultra high pressure.

  FIG. 1 shows a compressed air supply device that can be connected to a high-pressure plug and an ultrahigh-pressure plug and can supply compressed air corresponding to each plug. In FIG. The housing provided in is shown. The housing 1 includes a housing 1a provided directly on the apparatus main body and a coupler housing 1b coupled to the housing 1a. A primary pressure side opening 2 is formed on one side of the housing 1, and a secondary pressure side opening 3 leading to a coupler for connecting to a connecting device is formed on the other side.

  An adjustment cylinder 4 is disposed between the openings 2 and 3, and a compressed air conduction space S is formed around the adjustment cylinder 4. The adjusting cylinder 4 has a bottomed cylindrical shape, and one end opens to the primary pressure side opening 2, and the opposite side is closed by the bottom 5.

  Next, a first valve body 6 is disposed in the primary pressure side opening 2 of the housing 1, and a second valve body 7 is disposed in the secondary pressure side opening 3. The first valve body 6 is biased by a spring 8 so as to close the primary pressure side opening 2. A cylindrical stem 10 is slidably disposed in the secondary pressure side opening 3 and is engaged with the second valve body 7.

  An adjustment piston 11 is slidably disposed in the adjustment cylinder 4. One side of the adjustment piston 11 is formed in a conical shape, and a pressing portion 12 capable of pressing the first valve body 6 provided in the primary pressure side opening 2 is provided at the tip thereof. The one side surface 13 is a pressure receiving surface that receives the compressed air in the conduction space S. A through hole 14 is formed in the center of the adjustment piston 11.

  A pressure adjustment spring 15 is disposed between the other side of the adjustment piston 11 and the bottom 5 of the adjustment cylinder 4, and the adjustment piston 11 is always pressed by the pressure portion 12 by the pressure adjustment spring 15. It is biased in the pressing direction.

  Next, an operating rod 16 is provided between the first valve body 6 and the second valve body 7. The operating rod 16 passes through the central through hole 14 of the adjustment piston 11, a flange portion 18 is formed in the middle, and a pressing spring 20 is provided between the flange portion 18 and the adjustment piston 11. The operating rod 16 and the through hole 21 at the bottom of the adjustment cylinder 4 are sealed by a seal ring 22.

  The adjustment piston 11, the first valve body 6, the second valve body 7, the cylindrical stem 10, and the operating rod 16 are arranged coaxially. The operating rod 16 is urged by the presser spring 20 so that the second valve body 7 closes the secondary pressure side opening 3. When the second valve body 7 is operated over a certain amount of movement against the presser spring 20, the tip of the operating rod 16 is engaged with the first valve body 6, and further, the first valve body 6 is pushed out to the primary pressure side. Open the opening 2.

  In the above configuration, in the initial state (the state in which the plug is not attached), the adjustment piston 11 is pressed by the pressure adjusting spring 15 and the pressing portion 12 pushes the first valve body 6, so that the conduction space from the primary pressure side opening 2. Compressed air is supplied into S, acts on the pressure receiving surface 13 of the adjustment piston 11, and pushes back the adjustment piston 11 against the pressure adjustment spring 15. In this way, the adjustment piston 11 stops at a position where the pressure adjusting spring 15 force of the pressure adjusting spring 15 and the force (product of pressure receiving area and pressure) on the pressure receiving surface 13 are balanced. For this reason, the spring constant of the pressure adjusting spring 15 is set to correspond to a predetermined high pressure.

  Next, a coupler 9 is provided in the secondary pressure side opening. The coupler 9 includes a short cylinder portion 24 having a seal ring 23, a movable sleeve 26 having a protrusion 25 on the inner surface, a cylinder portion 30 having a hole 28 into which a lock ball 27 can be dropped, and a lock ball 27. A cylindrical body 31 that is locked or unlocked is provided.

  The coupler 9 can be fitted with a high-pressure plug 33 and an ultrahigh-pressure plug 34. The high-pressure plug 33 and the ultra-high-pressure plug 34 are different in that the length from the receiving groove 35 that receives the ball 27 to the tip is longer in the latter length than the former length.

  Therefore, an operation mode when the high-pressure plug 33 and the ultrahigh-pressure plug 34 are attached to the coupler 9 of the compressed air supply device will be described.

  First, as shown in FIG. 1, when the high-pressure plug 33 is inserted into the coupler 9, the annular projecting surface 37 at the tip of the large-diameter portion 36 of the plug 33 is first engaged with the projecting portion 25 of the movable sleeve 26. , The hole 28 of the cylindrical portion 30 is opened, the ball 27 is dropped into the hole 28 of the cylindrical portion by the movable sleeve 26, the plug 33 is further pressed, and the ball 27 is inserted into the receiving groove 35 of the large diameter portion 36. When engaged, the plug 33 cannot be pushed any further. At the same time, the cylindrical body 31 is pushed out by the spring 38 and covers the ball 27, so that the engaged state by the ball 27 is locked. At this time, the seal ring 23 of the coupler 9 comes into contact with the outer peripheral surface of the short cylinder portion 24 of the plug 33 to be sealed, and the tip of the plug 33 pushes the stem 10 of the coupler 9 against the presser spring 20 to The two-valve body 7 is opened and operated.

  When the plug 3 is removed from the coupler 9, the tubular body 31 is moved to the primary pressure side against the spring 38 and the plug 33 is extracted.

  Thus, the second valve body 7 opens and the operating rod 16 moves accordingly, but the amount of movement is not sufficient to push out the first valve body 6. At this time, the compressed air in the conduction space S is supplied to the high-pressure plug 33 through the cylindrical stem 10. When supplied, the pressure in the conduction space S is reduced, so that the force acting on the pressure receiving surface 13 of the adjustment piston 11 is reduced, the spring force of the pressure adjustment spring 15 is relatively increased, and the adjustment piston 11 is 1 The valve body 6 is pushed out and opened. As a result, compressed air having a primary pressure is supplied into the conduction space S. When the pressure in the conduction space S increases, the working pressure of the adjustment piston 11 against the pressure receiving surface 13 increases and moves against the spring force of the pressure adjusting spring 15, so the first valve body 6 is closed. In this way, high-pressure compressed air set by the spring force of the pressure adjusting spring 15 is supplied from the primary pressure side opening 2 to the conduction space S and discharged from the secondary pressure side opening 3.

  Next, when the ultrahigh-pressure plug 34 is inserted into the coupler 9, as shown in FIG. 2, the plug 34 is locked in the same manner as described above. In this case, the length of the tip of the plug 34 is longer than that of the high-pressure plug 33. Because of this, the pushing amount of the second valve body 7 is also large. For this reason, the amount of movement of the operating rod 16 also exceeds a certain amount of movement necessary to push in the first valve body 6. Therefore, the tip of the operating rod 16 directly pushes out the first valve body 6 to open the primary pressure side opening 2, and the ultra high pressure primary pressure is directly supplied to the ultra high pressure plug 34 through the conduction space S.

  As described above, when the high-pressure plug 33 and the ultrahigh-pressure plug are attached, predetermined compressed air can be supplied to each.

  3 (a) and 3 (b) show a coupler configuration in which a normal pressure plug and an ultrahigh pressure plug can be mounted. The coupler 9 has the same basic configuration as the coupler 9 of FIG. The cylindrical portion 24 is movable along the axial direction, is urged in the protruding direction by a spring 41, and the short cylindrical portion 24 is engageable with a protruding portion 42 formed on the outer surface of the cylindrical stem 10 on the inner surface. The difference is that the protrusion 43 formed on the outer surface is provided and the cylindrical stem 10 is long. Of course, the pressure in the conduction space S of the compressed air supply device in this case is set to be a normal pressure by reducing the spring force of the pressure adjusting spring 15. The coupler 9 may be coupled to the housing 1a provided in the apparatus main body in the same manner as in FIG.

  In the above configuration, when the normal pressure plug 32 is mounted as shown in FIG. 5A, the tip of the plug 32 pushes the short cylindrical portion 24 and engages the protrusions to push the stem 10, and the second While opening the valve body 7, the operating rod 16 is also moved. The amount of movement of the operating rod 16 at this time is the same as the amount of movement when the high-pressure plug 33 shown in FIG. 1 is attached. 3B, when the ultra-high pressure plug 34 is mounted, the stem 10 is pushed directly at the tip of the plug as described above, and the operating rod 16 together with the second valve body 7 as described above. Move. This amount of movement is also set so as to exceed a certain amount of movement necessary to push in the first valve body 6.

  Therefore, according to the above configuration, when the normal pressure plug 32 and the ultrahigh pressure plug 34 are attached to the same coupler 9, compressed air of a predetermined pressure can be supplied to each.

  Next, FIG. 4 shows an example of an embodiment in which a normal pressure plug, a high pressure plug, and an ultrahigh pressure plug are attached and predetermined compressed air can be supplied to each of them. The same members as those in the form are denoted by the same reference numerals.

  In this embodiment, further, a second adjustment cylinder 44 is provided on the second valve body 7 side of the adjustment cylinder 4. A second adjustment piston 45 is slidably accommodated in the second adjustment cylinder 44. The second adjustment piston 45 and the adjustment piston 11 are connected via a connecting rod 46.

  The operating rod 16 penetrates the second adjusting cylinder 44, and the operating rod 16 has a through hole 48 formed in the bottom 47 of the second adjusting cylinder 44 and a through hole 49 at the center of the second adjusting piston 45. Seal rings 50 and 51 are attached as seal members for sealing. The seal ring 51 of the second adjustment piston 45 is not sealed with the through hole 49 of the second adjustment piston 45 in the initial state. When the second valve body 7 moves the operating rod 16 to such an extent that the seal ring 50 is removed, the seal is removed and the compressed air in the conduction space S passes from the through hole 48 to the second adjustment cylinder 44. It is set to be introduced between the bottom 47 and the second adjustment piston 45.

  In this case, since the air pressure equal to the pressure in the conduction space S acts on the surface of the second adjustment piston 45, the second adjustment piston 45 moves to the primary pressure side, and at the same time, the adjustment piston 11 via the connecting rod 46. Is also moved in the same direction. The adjustment piston 11 is subjected to the spring force of the pressure adjustment spring 15 in the adjustment cylinder 4 and the force applied to the second adjustment piston 45. Accordingly, the first valve body 6 is opened, and high-pressure compressed air is supplied from the primary pressure side opening 2. The second valve body 7 continues to open until the supply pressure becomes high enough to correspond to the sum of the force of the pressure adjusting spring 15 and the force from the second adjustment piston 45. When the supply pressure exceeds a predetermined high pressure, the pressure receiving surface 13 of the adjustment piston 11 is reached. The force acting on the first valve body 6 closes.

  Thus, the pressure in the conduction space S can be set to a high pressure by the sum of the spring force of the pressure adjusting spring 15 and the force acting on the second adjustment piston 45, and the first valve body 6 is opened. Can be set to ultra-high pressure.

  Corresponding to the configuration of the compressed air supply device, the coupler 9 can also be fitted with a normal pressure plug 32, a high pressure plug 33, and an ultrahigh pressure plug 34. Such a coupler 9 has the same configuration as that shown in FIGS. The amount of movement of the second valve element 7 and the operating rod 16 when the above three types of plugs are attached is the smallest when the normal pressure plug is attached (to the extent that the seal ring 50 does not come off). When the plug 33 is attached, the amount of movement is large (to the extent that the seal ring 50 is detached), and the amount of movement is the largest when the ultra-high pressure plug 34 is attached. 6 is set to be pushed in.

  Therefore, an operation mode when the plugs are mounted on the compressed air supply device will be described.

  First, as shown in FIG. 5, when the normal pressure plug 32 is attached, the second valve body 7 opens, but the seal ring 50 cannot be removed. Normal pressure compressed air corresponding to the spring force of the spring 15 is supplied.

  Next, when the high-pressure plug 33 is attached, as shown in FIG. 6, the seal ring 50 of the operating rod 16 that moves together with the second valve body 7 is detached from the through hole 48 of the bottom 47 of the second adjustment cylinder 44 ( At this time, another seal ring 51 seals the through hole 49 of the second adjustment piston 45), so that the compressed air in the conduction space S enters from the through hole 48 of the bottom 47 of the second adjustment cylinder 44. For this reason, the pressure of the compressed air acts on the surface (pressure receiving surface 52) of the second adjustment piston 45 and presses and moves the adjustment piston 11 together with the pressure adjustment spring 15 to the primary pressure side. High pressure compressed air corresponding to the sum of the spring force and the force acting on the second adjustment piston 45 is supplied from the conduction space S to the high pressure plug 33.

  Further, as shown in FIG. 7, when the ultra-high pressure plug 34 is attached, the movement amount of the second valve body 7 and the operating rod 16 is large, so that the operating rod 16 directly pushes the first valve body 6. For this reason, the compressed air of the primary pressure is directly supplied to the plug 34.

  Therefore, according to the configuration of the compressed air supply device, when the normal-pressure plug, the high-pressure plug 33, and the ultrahigh-pressure plug 34 are mounted on the same coupler 9, compressed air having a predetermined pressure is supplied to each. Can do.

  In the above-described embodiment, the second adjustment piston 45 and the adjustment piston 11 are directly connected via the connection rod 46. However, instead of this configuration, as shown in FIG. The projecting shaft 53 is provided integrally with the adjustment piston 45, the projecting shaft 53 is projected into the adjustment cylinder 4, and a spring receiver 54 is formed at the tip of the projecting shaft 53, and between the spring receiver 54 and the adjustment piston 11. Alternatively, the pressure adjusting spring 15 may be arranged.

  Further, the second adjustment piston 45 and the projecting shaft 53 may be configured separately.

  In this case, when the high pressure plug (33) is attached, the seal ring 50 is detached as shown in the figure, and the compressed air enters the second adjustment cylinder 44 from the conduction space S, and the pressure receiving surface of the second adjustment piston 45 is shown. By acting on 52 and moving the second adjustment piston 45 to the primary pressure side, the pressure adjusting spring 15 is bent, so that the force of the pressure adjusting spring 15 is also increased. For this reason, since the spring force with respect to the adjustment piston 11 also increases, the pressure of the compressed air supplied into the conduction space S when the first valve body 6 is opened increases, and can be set to a required high pressure.

  As shown in FIG. 9, the pressure adjusting spring 15 is a double spring consisting of a strong pressure adjusting spring 15a and a weak pressure adjusting spring 15b so that the total spring force is the same as that of the pressure adjusting spring 15 shown in FIG. It is preferable that the spring constant of the strong pressure adjusting spring 15a is made low and the weak pressure adjusting spring 15b is in an unloaded state in the initial state. The reason is that the opening / closing sensitivity of the first valve body 6 is improved and the accuracy of pressure adjustment is improved. This is because if the spring constant is high, the sensitivity of the first valve body 6 is poor and the flow rate of the compressed air from the primary pressure side opening 2 tends to be reduced.

It is sectional drawing which shows one Embodiment at the time of mounting | wearing the compressed air supply apparatus which concerns on this invention with the high voltage | pressure plug. It is sectional drawing which shows one Embodiment at the time of mounting | wearing with the plug for ultra high pressures in the said compressed air supply apparatus. (A) (b) is sectional drawing which shows the form of the coupler which can mount | wear with the plug for normal pressures, and the plug for ultra high pressures. It is sectional drawing which shows embodiment of the compressed air supply apparatus which can mount | wear with the plug for normal pressure, a high pressure, and an ultrahigh pressure. It is sectional drawing which shows one Embodiment at the time of mounting | wearing with the plug for normal pressure to the said compressed air supply apparatus. It is sectional drawing which shows one Embodiment at the time of attaching the high pressure plug to the said compressed air supply apparatus. It is sectional drawing which shows one Embodiment at the time of mounting | wearing with the plug for ultra high pressures in the said compressed air supply apparatus. It is sectional drawing of the principal part of other embodiment of the said compressed air supply apparatus. It is sectional drawing of the principal part of other embodiment of the said compressed air supply apparatus.

Explanation of symbols

2 Primary pressure side opening 3 Secondary pressure side opening 4 Adjustment cylinder 6 First valve body 7 Second valve body 15 Pressure adjusting spring 16 Actuating rod 11 Adjustment piston 10 Stem 9 Coupler 32 Normal pressure plug 33 High pressure plug 34 Super high pressure plug

Claims (3)

A primary pressure side opening that leads to the compressed air supply source is formed on one side of the housing provided in the compressed air supply device body, and a secondary pressure side opening that leads to the coupler for the connected device is formed on the other side. An air conduction space is formed, and the adjustment cylinder is disposed to open to the primary pressure side opening, and one side of the adjustment piston that is slidably disposed in the adjustment cylinder is provided in the primary pressure side opening. The first valve body and a pressure receiving surface that receives the compressed air in the conduction space, and the other side constantly urges the pressing portion in the pressing direction by a pressure adjusting spring,
An operating rod is disposed between the second valve body provided in the secondary pressure side opening and the first valve body, and when the second valve body is operated over a certain amount of movement, the operating rod is The first valve body can be pressed,
When the normal pressure or the first high pressure plug and the second high pressure plug can be attached to the coupler, and the normal pressure or the first high pressure plug is attached, the second valve body exceeds the movement amount. The compressed air supply device, wherein the second valve body can be pushed in excess of the moving amount when the second high-pressure plug is attached and the second high-pressure plug is attached. A second adjusting cylinder is provided on the second valve body side of the adjusting cylinder, a second adjusting piston slidably provided on the second adjusting cylinder and the adjusting piston are connected via a connecting rod, and the operating rod And a seal member that seals the inner surface of the through hole at the bottom of the second adjustment cylinder is attached to the operating rod.
When the second valve body operates the operating rod to such an extent that the seal member is removed, compressed air in the conduction space is introduced from the through hole between the second adjustment piston and the bottom. ,
The coupler can be fitted with a normal pressure plug, a first high pressure plug, and a second high pressure plug, and when the first high pressure plug is fitted, the second valve body seals the operating rod with the seal. 2. The compressed air supply device according to claim 1, wherein the compressed air supply device can be pushed in such a degree that the member is detached and does not exceed the fixed movement amount. Instead of the connecting rod, a projecting shaft is provided on the second adjusting piston, the projecting shaft is projected into the adjusting cylinder, and a spring receiver is formed at the tip of the projecting shaft. Between the spring receiver and the adjusting piston, The compressed air supply device according to claim 2, wherein the pressing portion is constantly urged in the pressing direction by a pressure adjusting spring disposed in the pressure chamber.

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