JP4517977B2 - Safety mechanism for compressed air supply equipment - Google Patents

Description

  The present invention provides a compressed air having a pressure corresponding to each plug when both the low-pressure plug and the second high-pressure plug or the low-pressure plug, the first high-pressure plug, and the second high-pressure plug are connected. In the compressed air supply apparatus that can supply the low pressure plug, the high pressure compressed air is prevented from being supplied from the primary pressure side to the low pressure plug on the secondary pressure side when the low pressure plug is connected.

  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. Therefore, in addition to the conventional low pressure of less than 0.98 MPa and the first high pressure of 2.94 MPa or less, the maximum operating pressure is a hose that has a second working pressure of 4 to 4.2 MPa or less. There is also a connected device attached to the tip of the device. 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 coupler and a high pressure coupler are attached to a common air compressor which is provided with a pressure reducing valve and can supply both normal pressure (low pressure) and high pressure compressed air, and the low pressure coupler has a low pressure plug. The nailer is configured to connect a nailing machine having a high-pressure plug to the high-pressure coupler. On the other hand, it is also known that a normal pressure (low pressure) and high pressure plug can be connected to the same coupler.
JP 2003-90480 A

  However, if a compressed air supply device is equipped with a single coupler and plugs with multiple pressure bands can be connected to it, the coil spring constituting the pressure adjustment mechanism (pressure reduction mechanism) in the device will break due to some cause. Or when the seal ring is damaged, when the low pressure plug is connected without noticing this, the high pressure primary pressure is supplied to the low pressure plug as it is, and the connecting equipment such as the nailing machine is damaged, There is a possibility of being out of hand because of unexpected high output.

  The present invention solves the above problems, and when a high pressure outside the standard exceeding the specified pressure is supplied to the low pressure plug due to damage to the internal parts, it is promptly released to the atmosphere to avoid danger. It is an object of the present invention to provide a safety mechanism for a compressed air supply device that can ensure safety.

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a compressed air supply device main body having a primary pressure side opening that leads to a compressed air supply source on the other side and a secondary pressure side opening that leads to a coupler for a connected device on the other side. A compressed air conduction space is formed between the openings, a pressure adjusting mechanism is provided on the primary pressure side of the compressed air supply device body, and a low pressure plug and a first high pressure are provided on the secondary pressure side opening. A coupler that connects the plug for use with the second high-pressure plug is provided, and a valve body that opens and shuts off the compressed air that has been regulated by the pressure regulating mechanism to the secondary pressure side is provided in the middle to operate the pressure regulating mechanism in the compressed air supply apparatus that supplies the compressed air is allowed to air pressure corresponding to the respective plug, the compressed air in excess of a predetermined pressure is arranged a safety valve that opens to the atmosphere freely opened and closed with respect to said flow space, said Equipped with safety valve The housing forms a small hole communicating with the flow space, the small holes with closed by a movable sleeve provided on the introducing space side, the movable sleeve forming the small hole communicating with possible side holes, the low-pressure The side hole and the small hole communicate with each other only when the plug is connected . When the air pressure of the compressed air in the conduction space exceeds the predetermined pressure, the air pressure is released to the atmosphere by opening the safety valve. characterized in that way the.

According to a second aspect of the present invention, in the first aspect, when the plugs are connected, the valve body is moved by a different amount of movement to open the primary pressure side and the secondary pressure side, and according to the amount of movement of the valve body. in the compressed air supply apparatus that by operating the pressure adjustment mechanism supplying compressed air pressure corresponding to the respective plug, said only when moving extruding the valve body with the connection of the low-pressure plug The lateral hole and the small hole communicate with each other.

The invention according to claim 3, in claim 1, in the flow space side of the coupler, instead of the movable sleeve is provided with a tubular actuating member which operates only when connected to the low-pressure plug, the safety valve, while disposed in the secondary pressure side of the valve body, the small holes with closed by the actuating member, the said actuating member to form the small hole communicating with possible side holes, said actuating member is the low-pressure The side hole communicates with the small hole only when operated so as to be pushed in with the connection of the plug, and when the air pressure of the compressed air in the conduction space exceeds the predetermined pressure, the air pressure is reduced to the safety valve. It is characterized in that it is opened to the atmosphere .

  According to the first aspect of the present invention, when the low pressure plug is connected to the secondary pressure side opening, the compressed air in the conduction space formed between both the primary pressure side and secondary pressure side openings is supplied to the safety valve. The Therefore, when the compressed air exceeding a predetermined pressure is supplied to the conduction space due to damage or wear of the parts constituting the pressure adjusting mechanism for some reason, the safety valve opens and the compressed air is quickly Released into the atmosphere. Therefore, it is possible to avoid danger and ensure safety.

  According to the second aspect of the present invention, when the low pressure plug is connected to the secondary pressure side opening, the compressed air in the conduction space is supplied to the safety valve simultaneously with the movement of the valve body. As in the case of the invention, when compressed air exceeding a predetermined pressure is supplied to the conduction space due to damage or wear of parts constituting the pressure adjustment mechanism for some reason, the safety valve opens and the above-mentioned The compressed air is quickly released into the atmosphere. Therefore, it is possible to avoid danger and ensure safety.

  According to the third aspect of the invention, the compressed air in the conduction space is supplied to the safety valve only when the operating member that operates only when the low-pressure plug is inserted is operated. As in the case, when the compressed air exceeding a predetermined pressure is supplied to the conduction space due to damage or wear of the components constituting the pressure adjusting mechanism for some reason, the safety valve opens and the compressed air is opened. Is promptly released to the atmosphere. Therefore, it is possible to avoid danger and ensure safety.

  Hereinafter, embodiments of the present invention will be described. For convenience, the “first high pressure” in the high pressure zone is set to “intermediate pressure”, and the “second high pressure” in the higher pressure zone <ultra-high pressure zone> is set higher. It will be described as “high pressure”.

  FIG. 1 shows an example of an embodiment in which a low-pressure plug, an intermediate-pressure plug, and a high-pressure plug can be connected to each other, and predetermined compressed air can be supplied to each of them. The housing provided in the compressed air supply device main body 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 connection 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.

  A pressure adjustment mechanism is provided between the first valve body 6 and the second valve body 7. That is, the 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.

  Furthermore, a second adjustment cylinder 21 is provided on the second cylinder 7 side of the adjustment cylinder 4. A second adjustment piston 22 is slidably accommodated in the second adjustment cylinder 21. Further, the second adjustment piston 22 and the adjustment piston 11 are connected via a connecting rod 23.

  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 center through hole 14 of the adjustment piston 11 and the second adjustment cylinder 21, and a flange portion 18 is formed between them, and a presser spring 20 is interposed between the flange portion 18 and the adjustment piston 11. Is provided. The operating rod 16 and the through hole at the bottom of the adjustment cylinder 4 are sealed by a seal ring. The operating rod 16 is provided with seal rings 27 and 28 for sealing a through hole 25 formed in the bottom 24 of the second adjustment cylinder 21 and a through hole 26 at the center of the second adjustment piston 22. The seal ring 28 of the second adjustment piston 22 is not sealed with the through hole 26 of the second adjustment piston 22 in the initial state. When the second valve body 7 moves the operating rod 16 to the extent that the seal ring 27 is removed, the seal is removed and the compressed air in the conduction space S passes through the through-hole 25 to the second adjustment cylinder 21. It is set to be introduced between the bottom 24 and the second adjustment piston 22.

  The adjustment piston 11, the second adjustment piston 22, 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. The opening 2 is opened.

  Next, the safety valve 30 is arranged facing the conduction space S between the pressure adjusting mechanism and the second valve body 7. That is, as shown in detail in FIG. 2, a safety valve body 34 is slidably disposed in a valve housing 33 opened in a small hole 32 formed through the side wall 31 of the housing 1b. The small hole 32 is biased by the spring 35. O-rings 36 are disposed on both ends of the small hole 32. The spring force of the spring 35 is set to correspond to a predetermined pressure, that is, a low pressure to be supplied to a low pressure plug (53) described later, and a pressure exceeding the predetermined pressure is supplied to the small hole 32. In some cases, the safety valve body 34 is retracted to open the small hole 32 to the atmosphere through the exhaust slit 37.

  Further, the tip opening of the small hole 32 is closed by a movable sleeve 38. A protrusion 40 is formed on the inner side of the movable sleeve 38, and this protrusion 40 is engaged with the shoulder on the side surface of the second valve body 7. Further, the movable sleeve 38 is biased to the secondary pressure side by the spring 41. Thereby, the movable sleeve 38 is configured to always work with the second valve body 7. Further, a lateral hole 42 is formed in the movable sleeve 38. The lateral hole 42 is configured to communicate with the small hole 32 when the second valve body 7 is connected to a low-pressure plug 53 to be described later and pushed and moved.

  In this case, the pressure in the conduction space S of the compressed air supply device is set so that the spring force of the pressure adjusting spring 15 is reduced to a low pressure.

  Next, a coupler 9 is provided in the secondary pressure side opening 3. The coupler 9 is provided with a cylindrical portion 45 having a hole into which the cylindrical operating member 43 and the locking ball 44 can be dropped, and a cylindrical body 46 that locks or unlocks the locking ball 44. . The actuating member 43 is movable along the axial direction, and has a protrusion 52 that can engage with a protrusion 51 formed on the outer surface of the cylindrical stem 10 on the inner surface. Reference numerals 47, 48, and 49 denote springs that urge the respective members in the protruding direction.

  An operation mode when the low pressure plug 53, the intermediate pressure plug 54, and the high pressure plug 55 are connected to the coupler 9 of the compressed air supply device will be described.

  In the initial state of FIG. 1 (the state where the plug is not attached and the second valve body 7 is blocking the primary side from the secondary side), the adjustment piston 11 is pressed by the pressure adjusting spring 15. Since the pressing portion 12 pushes the first valve body 6, compressed air is supplied from the primary pressure side opening 2 into the conduction space S, acts on the pressure receiving surface 13 of the adjustment piston 11, and causes the adjustment piston 11 to move to the pressure adjustment spring 15. Push back against. 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 regulating spring 15 is set to correspond to a predetermined low pressure. The pressure in the conduction space S is displayed on the pressure display unit.

  First, when the low-pressure plug 53 is connected as shown in FIG. 3, the tip of the plug pushes the operating member 43 to engage the protrusions 51, 52 to push the stem 10, and the second valve body 7 is moved. In addition to the opening operation, the operating rod 16 is also moved. The amount of movement of the operating rod 16 at this time is set such that the seal ring 27 of the operating rod 16 does not come off from the through hole 25 of the bottom 24 of the second adjustment cylinder 21. Therefore, the low-pressure compressed air in the conduction space S is supplied.

  Next, when the intermediate pressure plug 54 is connected, as shown in FIG. 4, the stem 10 is directly pushed out at its tip to open the second valve body 7. Since the amount of movement of the second valve body 7 at this time is larger than that when the low-pressure plug 53 is connected, the seal ring 27 of the operating rod 16 that moves together with the second valve body 7 is provided on the bottom 24 of the second adjustment cylinder 21. It is set to such an extent that it is removed from the through hole 25 (at this time, another seal ring 28 seals the through hole 26 of the second adjustment piston 22). The compressed air in the conduction space S enters from the through hole 25 in the bottom 24 of the second adjustment cylinder 21. For this reason, the pressure of the compressed air acts on the surface (pressure receiving surface 50) of the second adjustment piston 22, and the adjustment piston 11 is pressed and moved together with the pressure adjusting spring 15 to move the first valve body. 6 is opened, and compressed air of intermediate pressure 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 adjusting piston 22, and when the predetermined intermediate pressure is exceeded, the pressure receiving surface of the adjusting piston 11 The force acting on 13 becomes stronger and the first valve body 6 closes. In this way, compressed air having an intermediate pressure corresponding to the sum of the spring force of the pressure adjusting spring 15 and the force acting on the second adjusting piston 22 is supplied from the conduction space S to the intermediate pressure plug 54.

  Further, as shown in FIG. 5, when the high-pressure plug 55 is connected, the stem 10 is directly pushed out at the tip thereof to open the second valve body 7, and the second valve body 7 and the operating rod at this time are operated. Since the movement amount of 16 is the largest, the operating rod 16 directly pushes in the first valve body 6. For this reason, high-pressure primary compressed air is directly supplied to the plug.

  Therefore, according to the configuration of the compressed air supply device, when the low pressure plug 53, the intermediate pressure plug 54, and the high pressure plug 55 are attached to the same coupler 9, compressed air having a predetermined pressure is supplied to each. Can do.

  As described above, the movement amount of the second valve body 7 and the operating rod 16 when the three types of plugs are attached is the smallest when the low pressure plug 53 is attached (the seal ring 27 does not come off). Next, the amount of movement when the intermediate pressure plug 54 is mounted is large (the degree to which the seal ring 27 is detached), the largest when the high pressure plug 55 is mounted, and the operating rod 16 exceeds the certain amount of movement. Is set so as to push the first valve body 6.

  When the low pressure plug 53 is connected, as shown in FIG. 6, the movable sleeve 38 operates together with the second valve body 7, and the conduction space S communicates with the lateral hole 42 and the small hole 32 of the movable sleeve 38. . For this reason, the compressed air in the conduction space S presses the tip of the safety valve element 34, but the safety valve element 34 does not operate if the compressed air is within a predetermined pressure. When the intermediate pressure plug 54 and the high pressure plug 55 are connected, the lateral hole 42 of the movable sleeve 38 exceeds the O-ring 36 of the small hole 32 as shown in FIGS. Is closed.

  By the way, if the spring of the pressure adjusting mechanism is broken or the O-ring 36 is broken, the compressed air of the primary pressure flows into the secondary pressure side due to some unforeseen cause. It is possible to know that the internal pressure is abnormal. However, there is a possibility that the low voltage plug 53 may be connected by overlooking this.

  However, even in such a case, when the low-pressure plug 53 is connected, the conduction space S, the lateral hole 42 of the movable sleeve 38 and the small hole 32 communicate with each other, and the high-pressure compressed air in the conduction space S is the safety valve 30. The safety valve body 34 is moved backward by pressing the tip of the safety valve body 34. Thereby, the compressed air in the conduction space S is released from the exhaust slit 37 to the atmosphere, and the conduction space S is depressurized. For this reason, it is possible to effectively prevent the primary pressure from being directly supplied to the low-pressure plug 53, and it is possible to avoid danger and ensure safety.

  Next, only when the low pressure plug 53 is connected, the second valve body 7 is configured to open and operate by pushing the operating member 43 and engaging the protrusions 51 and 52 to push the stem 10. Has been.

  Therefore, the safety mechanism may be configured as follows using the operating member 43. In the following drawings, the operation of the pressure adjustment mechanism on the primary pressure side is the same as that shown in FIGS. Moreover, since the structure of a safety valve is also the same, the description is also abbreviate | omitted. That is, as shown in FIG. 7, the safety valve 30 is disposed on the secondary pressure side of the second valve body 7. A safety valve element 34 is slidably disposed in a valve housing 33 opened in a small hole 32 penetratingly formed in the side wall 31 of the housing, and urged to close the small hole 32 by a spring 35 from the back. . O-rings 36 are disposed on both ends of the small hole 32. The spring force of the spring 35 is set so as to correspond to a predetermined pressure, that is, a low pressure to be supplied to a low pressure plug 53 described later, and when a pressure exceeding the predetermined pressure is supplied to the small hole 32. The safety valve body 34 is retracted to open the small hole 32 to the atmosphere through the exhaust slit 37.

  Further, the tip opening of the small hole 32 is closed by a cylindrical actuating member 43. A lateral hole 42 is formed in the operating member 43. The lateral hole 42 is configured to communicate with the small hole 32 when the second valve body is pushed out and moved when a low-pressure plug 53 described later is connected.

  Also in this case, when the low-pressure plug 53 is connected, as shown in FIG. 8, the operating member 43 operates, and the conduction space S communicates with the lateral hole 42 and the small hole 32 of the operating member 43. For this reason, the compressed air in the conduction space S presses the tip of the safety valve element 34, but the safety valve element 34 does not operate if the compressed air is within a predetermined pressure. When the intermediate pressure plug 54 and the high pressure plug 55 are connected, the lateral hole 42 of the movable sleeve 38 does not move, so that the small hole 32 is closed.

  On the other hand, when the pressure adjustment mechanism spring breaks or the O-ring breaks, the primary pressure compressed air flows into the secondary pressure side due to some unforeseen cause. When 53 is connected, the conduction space S communicates with the lateral hole 42 and the small hole 32 of the actuating member 43 as shown in FIG. 8, and high-pressure compressed air in the conduction space S is supplied to the safety valve 30, And the safety valve element 34 is retracted against the spring 35. Thereby, the compressed air in the conduction space S is released from the exhaust slit 37 to the atmosphere, and the conduction space S is depressurized. For this reason, it is possible to effectively prevent the primary pressure from being directly supplied to the low pressure plug 53. Therefore, it is possible to avoid danger and ensure safety.

  As shown in FIG. 9, when the intermediate pressure plug 54 is connected and when the high pressure plug 55 is connected as shown in FIG. 10, the lateral hole 42 and the small hole 32 do not communicate with each other.

  As mentioned above, when a part inside the safety mechanism of the compressed air supply device is damaged and a high pressure outside the standard exceeding the specified pressure is supplied to the low pressure plug, it is quickly released to the atmosphere to avoid danger. To ensure safety.

  The safety mechanism according to the present invention is not limited to the above-described embodiment as long as it is configured to supply the compressed air in the conduction space to the safety valve only when the low-pressure plug is activated.

  Also, the number of plugs that can be connected to one coupler is not limited to three. Two types or four or more types may be used.

It is sectional drawing which shows one Embodiment of the compressed air supply apparatus which concerns on this invention. It is an enlarged view of the safety valve part of FIG. It is sectional drawing which shows one Embodiment at the time of attaching the low pressure plug to the said compressed air supply apparatus. It is sectional drawing which shows one Embodiment at the time of attaching the plug for intermediate pressures 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 an enlarged view of a safety valve portion when a low pressure plug is attached to the compressed air supply device. It is sectional drawing of a part of compressed air supply apparatus provided with the other safety valve. It is sectional drawing which shows one Embodiment at the time of attaching the low pressure plug to the said compressed air supply apparatus. It is sectional drawing which shows one Embodiment at the time of attaching the plug for intermediate pressures 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.

Explanation of symbols

2 Primary pressure side opening 3 Secondary pressure side opening 4 Adjustment cylinder 6 First valve body 7 Second valve body 9 Coupler 10 Stem 15 Pressure regulating spring 32 Small hole 34 Safety valve body 37 Exhaust slit 38 Movable sleeve 43 Actuating member 53 Low pressure Plug 54 Intermediate pressure plug 55 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 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. In addition, a pressure adjusting mechanism is provided on the primary pressure side of the compressed air supply device body, and a coupler that connects the low pressure plug, the first high pressure plug, and the second high pressure plug to the secondary pressure side opening. Provided in the middle is a valve body that opens and shuts down the compressed air adjusted by the pressure adjusting mechanism to the secondary pressure side, and operates the pressure adjusting mechanism to supply compressed air of pneumatic pressure corresponding to each plug. In the compressed air supply device as described above,
A safety valve that opens compressed air that exceeds a predetermined pressure to the atmosphere is disposed so as to be openable and closable with respect to the conduction space, and a small hole that communicates with the conduction space is formed in a housing that includes the safety valve. It is closed with a movable sleeve provided on the space side, and the movable sleeve is formed with a lateral hole that can communicate with the small hole, and only when the movable sleeve is operated to be pushed in with the connection of the low-pressure plug . The lateral hole communicates with the small hole, and when the air pressure of the compressed air in the conduction space exceeds the predetermined pressure, the air pressure is opened to the atmosphere by opening the safety valve. A safety mechanism for a compressed air supply device. When the plugs are connected, the valve body is moved by a different amount of movement to open the primary pressure side and the secondary pressure side, and the pressure adjusting mechanism is operated according to the amount of movement of the valve body to correspond to each plug. In the compressed air supply device that supplies compressed air of high air pressure, the lateral hole and the small hole communicate with each other only when the valve body is pushed and moved in connection with the connection of the low pressure plug. The safety mechanism of the compressed air supply device according to claim 1, wherein the safety mechanism is a feature. Instead of the movable sleeve, a cylindrical actuating member that operates only when the low pressure plug is connected is provided on the conducting space side of the coupler, and the safety valve is disposed on the secondary pressure side of the valve body. In addition, the small hole is closed with the operating member, and a horizontal hole that can communicate with the small hole is formed in the operating member , and the operating member is operated to be pushed in with the connection of the low pressure plug. Only when the lateral hole and the small hole communicate with each other, and the air pressure of the compressed air in the conduction space exceeds the predetermined pressure, the air pressure is opened to the atmosphere by opening the safety valve. The safety mechanism of the compressed air supply device according to claim 1, wherein the safety mechanism is a feature.

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