JP2011208760A - High-pressure gas drive unit using high-pressure gas as driving source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve stable driving while using high-pressure gas as a driving source.SOLUTION: A gas pressure control mechanism 55 is provided for performing control to reduce pressure of carbon dioxide injected from a gas storage vessel 1 filled with liquefied carbon dioxide supplied to a hammering tool as a high-pressure gas drive unit driven by using pressure of high-pressure gas. The gas pressure control mechanism includes: a needle valve 24 arranged to be moved forward and backward in a vessel body 21 filled with the liquefied carbon dioxide in the gas storage vessel 2, biased by a valve pressing spring 28, and biased in a direction closing a gas injection hole 26; and a piston pressing spring 42 applying biasing force pressing the needle valve 24 in a direction of retreating from the gas injection hole 26 to a piston 39 pressing the needle valve 24 by receiving the biasing force of the piston pressing spring 42. By controlling the biasing force of the piston pressing spring, the pressure of the carbon dioxide emitted from the injection hole 26 is controlled to be reduced.

Description

  The present invention relates to a high-pressure gas drive apparatus that uses a high-pressure gas such as compressed high-pressure carbon dioxide gas as a drive source.

  Conventionally, a high-pressure gas driving device using a high-pressure gas such as compressed air, compressed carbon dioxide gas, or compressed nitrogen gas as a driving source has been used. As this type of high-pressure gas drive device, for example, a nail driving device for driving a fastening tool such as a staple formed with a U-shaped nail or a wire rod by moving the striking tool using the pressure of compressed air. There are driving devices such as machines. This type of driving device is connected to an air compressor that compresses air and generates compressed air via an air hose, and is configured to operate using compressed air supplied from the air compressor as a drive source.

  By the way, a driving device such as a nail driver is used in a construction site of a house and the like, and a fastening tool such as a nail is driven while moving to an appropriate driving position. In the case of using the driving position while moving the driving position as described above, the driving range using the air compressor is restricted by the moving range. The air compressor has a large weight and is large compared to the driving device, and thus cannot be easily moved. For this reason, the movement range of the driving device is restricted by the installation position of the air compressor and the length of the air hose connected to the air compressor, and moves freely to a desired driving position to perform the driving operation of the fastening device. I can't.

  Therefore, a driving device such as a nailing machine has been proposed in which a pressurizing medium such as high-pressure gas is supplied to the driving device without using an air compressor, and a fastening tool can be driven. As this type of driving device, there is one in which high pressure gas is supplied from a high pressure gas container detachably attached to a nail driving portion to drive the nail (Patent Document 1). .

  In addition, a gas storage unit filled with liquid carbon dioxide gas is provided inside the driving device, and the liquid carbon gas charged in the gas storage unit is phase-changed to high-density carbon dioxide and supplied to the driving unit. Has been proposed (Patent Document 2).

Japanese Patent Publication No. 48-29906 JP 2005-510369 A

  By the way, the driving device described in Patent Document 1 is configured so that the high-pressure liquefied gas filled in the high-pressure gas container is vaporized by the vaporization promoting member and supplied to the driving unit, but the high-pressure gas container is filled. The high-pressure liquefied gas is vaporized by the vaporization promoting member without being subjected to pressure control and directly supplied to the driving portion. As described above, since the pressure of the high pressure gas supplied to the driving portion is not controlled, the pressure of the high pressure gas supplied to the driving portion cannot be kept constant, and stable nail driving can be performed. I can't do it. Further, extremely high pressure gas is supplied to the driving portion, and there is a possibility that it is impossible to drive a safe nail.

  Moreover, the apparatus described in Patent Document 2 is also supplied to the driving unit only by changing the phase of the liquid carbon dioxide filled in the gas storage unit into high-density carbon dioxide and supplying it to the driving unit. The pressure of carbon dioxide is not controlled at all. Therefore, similarly to the apparatus described in Patent Document 1, the pressure of the high-pressure gas supplied to the driving unit cannot be kept constant, and stable nail driving cannot be performed. In addition, extremely high pressure gas is supplied to the driving portion, and there is a possibility that safe nailing cannot be performed. In particular, there is a risk of high pressure gas bursting.

  Therefore, an object of the present invention is to provide a high-pressure gas drive device that can realize stable driving while using a high-pressure gas filled in a gas storage container as a drive source.

  Another object of the present invention is to provide a high-pressure gas drive device that can realize stable driving of the high-pressure gas drive tool by supplying high-pressure gas with a constant pressure control to the high-pressure gas drive tool.

  Furthermore, it is an object of the present invention to provide a high-pressure gas drive device that can realize pressure control of high-pressure gas supplied from a gas storage container with a simple and small-sized mechanism.

  A high-pressure gas drive device using a high-pressure gas as a drive source according to the present invention proposed to achieve the above-described problems includes a high-pressure gas drive tool driven using the pressure of the high-pressure gas, and the high-pressure gas. A high-pressure gas injected from the gas storage container, comprising: a gas storage container filled with high-pressure gas supplied to the driving tool; and a pressure control mechanism that controls the pressure of the high-pressure gas injected from the gas storage container under reduced pressure. The pressure is controlled by the pressure control mechanism and supplied to the high-pressure gas drive tool.

  In the high-pressure gas drive device according to the present invention, the pressure control mechanism is provided integrally with the gas storage container.

  The gas storage container is connected to a high-pressure gas drive tool through a conduit.

  The pressure control mechanism used in the high-pressure gas driving device according to the present invention is disposed in a container main body filled with high-pressure gas in a gas storage container so as to be able to advance and retreat, and is urged by a first urging member to A needle valve urged in a direction to close a gas injection hole provided in the main body, a piston that presses the needle valve in response to an urging force of a second urging member, and the needle valve is injecting the gas A second biasing member that presses and biases the piston in the direction of retreating from the hole, and controls the biasing force of the second biasing member that presses and biases the piston, so that The pressure of the high-pressure gas radiated to the outside is controlled to be reduced.

  More specifically, the pressure control mechanism is disposed so as to be able to advance and retreat in a container body filled with high-pressure gas in a gas storage container, and opens and closes a gas injection hole provided in the container body; A first urging member that moves and urges the needle valve in a direction to close the gas injection hole, and a cylinder unit that is connected to the container body and that is supplied with high-pressure gas injected from the gas injection hole. A piston that presses the tip end side of the needle valve protruding from the injection hole toward the cylinder part, a second biasing member that presses and biases the piston toward the needle valve, and Urging member displacing means for variably controlling the displacement amount of the second urging member to control the pressing urging force of the piston, and operating the urging member displacing means to reduce the pressing urging force of the piston. System By, for controlling the pressure of the high pressure gas emitted into the cylinder portion.

  The cylinder part constituting the pressure control mechanism is provided in a piston housing connected to the container body, the cylinder part is provided with a gas outflow hole, and the pressure is controlled through the gas outflow hole. Gas is spilled.

  The piston housing is provided with a piston opening portion continuous with the cylinder portion, and when the pressure of the cylinder portion is excessive, the piston is resisted against the biasing force of the second biasing member. Then, it moves to the piston opening part to open the cylinder part to the atmosphere, and discharges the high-pressure gas in the cylinder part to the atmosphere.

  The high-pressure gas drive device according to the present invention controls the high-pressure gas injected from the gas container filled with the high-pressure gas that drives the high-pressure gas drive tool by the pressure control mechanism to reduce the pressure and supplies the high-pressure gas drive tool to the high-pressure gas drive tool. Therefore, the high-pressure gas drive tool is driven by the high-pressure gas whose pressure is controlled to be constant, and can perform stable and safe driving by preventing an explosion and the like.

  In addition, since the pressure control mechanism for controlling the pressure of the high-pressure gas to be injected is integrally provided in the gas storage container, the gas supply source can be miniaturized and the entire apparatus can be made portable.

  Furthermore, in the present invention, the gas storage container is connected to the high-pressure gas drive tool via the conduit, so that the high-pressure gas radiated from the gas storage container can be completely vaporized while flowing through the conduit. Stable driving of the gas driven tool can be realized. This is particularly effective when liquefied carbon dioxide is used as the high-pressure gas. The liquefied carbon dioxide gas may become a solid phase when radiated in a rapidly depressurized environment, but can be reliably vaporized while flowing through the conduit.

  Furthermore, the pressure control mechanism that controls the pressure of the high-pressure gas injected from the gas storage container is a biasing member that controls the pressure of the piston that presses and operates the needle valve that opens and closes the gas injection hole provided in the gas storage container. By variably controlling the urging force, the pressure of the high pressure gas injected from the gas storage container can be controlled, so that the mechanism can be simplified and the size can be reduced.

  And the high pressure gas injected from the gas storage container is discharged to the cylinder part where the piston constituting the pressure control mechanism advances and retreats, and flows out to the outside from the gas outflow hole provided in this cylinder part. Simplification of the mechanism for releasing high-pressure gas can be realized.

  Furthermore, the piston housing where the pressure control mechanism is provided is provided with a piston opening part, so that when the inside of the cylinder part becomes excessive pressure, the cylinder part is opened to the atmosphere. Safety.

FIG. 1 is a perspective view showing the overall configuration of an example in which the present invention is applied to a fastening device driving apparatus. FIG. 2 is a cross-sectional view showing the internal structure of the impact tool used in the present invention. FIG. 3 is a perspective view showing the appearance of the gas storage container used in the present invention. FIG. 4 is a cross-sectional view showing the internal structure of the gas storage container used in the present invention, and shows a state where the gas injection hole is closed by the needle valve. FIG. 5 is a cross-sectional view of the gas storage container showing a state in which the needle valve is pressed by the piston and the gas injection hole is opened. FIG. 6 is a cross-sectional view of the gas injection control mechanism showing a state in which the gas injection hole closed by the needle valve is opened. FIG. 7 shows a gas storage container in which the piston is moved in a direction to compress the piston pressing spring under the pressure of the gas in the cylinder portion, the needle valve is fitted in the gas injection hole, and the gas injection hole is closed. It is sectional drawing. FIG. 8 is a cross-sectional view of the gas injection control mechanism showing a state in which the carbon dioxide gas supplied to the gas storage chamber of the impact tool is released and the gas injection hole is closed by the needle valve.

  Embodiments of a high-pressure gas driving device according to the present invention that is driven using a high-pressure gas as a driving source will be described below with reference to the drawings.

  The present invention can be widely applied to a high-pressure gas driving device using a high-pressure gas such as liquefied carbon dioxide gas or compressed nitrogen gas as a driving source. For example, a nail driving device such as a nailing machine or a tucker for driving a fastener such as a staple formed of a nail or a wire in a U-shape, or a high pressure gas pressure is used to eject or inject various materials. Applied to the device.

  Hereinafter, the present invention will be described with reference to an example in which the present invention is applied to a high-pressure gas driving device using a striking tool for driving a fastener such as a nail or a staple as a high-pressure gas driving tool.

  As shown in FIG. 1, the high-pressure gas drive device according to the present invention includes an impact tool 1, a gas storage container 2 that stores high-pressure gas that drives the impact tool 1, and an impact tool 1 and a gas storage container 2. And a conduit 3 connecting the two.

  In the present embodiment, an example in which liquefied carbon dioxide gas compressed and liquefied is used as the high-pressure gas will be described. Carbon dioxide gas is liquefied when compressed to 70 atm at normal temperature (25 ° C.).

  The striking tool 1 used in the present embodiment is for striking a staple 4 in which a thin linear member is bent in a U-shape. As shown in FIG. A striking drive unit 6 provided with a mechanism 5, a handle unit 8 having a gas storage chamber 7 in which vaporized high-pressure carbon dioxide gas supplied from the gas storage container 2 is stored, and the striking tool 1 And a staple storage unit 9 in which the staples 4 to be driven are stored.

  The impact driving unit 6 constituting the impact tool 1 is provided so as to incorporate an impact cylinder 10 constituting the impact mechanism 5. A striking piston 11 that constitutes a striking mechanism 5 together with the striking cylinder 10 is disposed inside the striking cylinder 10 so as to be able to advance and retreat. A striking tool 12 for performing a driving operation of the staple 4 delivered from the staple storage unit 9 is attached to the striking piston 11. The striking tool 12 is formed by a long shaft-like member, and has a base end connected to the center of the striking piston 11 so that it can move integrally with the striking piston 11. The striking tool 12 is connected to the striking piston 11, and the tip portion is made to enter a nose portion 13 provided at the tip portion of the striking drive unit 6.

  The nose portion 13 is configured such that the tip of the staple storage portion 9 is opened and the staple 4 stored in the staple storage portion 9 is supplied.

  The striking drive unit 6 supplies and exhausts high-pressure carbon dioxide gas supplied from the gas storage container 2 to the gas storage chamber 7 to the striking cylinder 10, and controls the advance and retreat of the striking piston 11 disposed in the striking cylinder 10. A head valve 14 is provided.

  The handle portion 8 is a portion that grips the striking tool 1 when the staple 4 is driven, and a trigger valve 15 that controls the head valve 14 is operated at the base portion on the connection side to the striking drive portion 6. A trigger valve operating lever 16 is provided. The trigger valve operating lever 16 is attached so as to be rotatable about a support shaft 16a provided on the handle portion 8, and is provided inside the handle portion 8 by rotating with a finger gripping the handle portion 8. The trigger valve 15 is operated to control the head valve 14.

  A conduit 3 for introducing high-pressure carbon dioxide gas supplied from the gas storage container 2 into the impact tool 1 is provided on the base end side opposite to the connection portion side of the handle portion 8 to the impact drive unit 6. A connection plug 17 to be connected is provided. The connection plug 17 communicates with the gas storage chamber 7 configured in the handle portion 8. The conduit 3 connected to the gas storage container 2 is connected to the striking tool 1 by fitting a connection socket 18 attached to one end to the connection plug 17, and carbon dioxide gas supplied from the gas storage container 2. Is introduced into the gas storage chamber 7 in the impact tool 1.

  Then, as shown in FIG. 3, the gas storage container 2 filled with the liquefied carbon dioxide serving as the drive source for the impact tool 1 has a strength sufficient to withstand the pressure of the filled liquefied carbon dioxide. And a container body 21 formed in a bottomed cylindrical shape using a metal such as stainless steel. As shown in FIG. 4, the container main body 21 has a cylindrical reduced diameter portion 22 formed on the upper end side. The reduced diameter portion 22 is formed by drawing the upper end side of the container body 21. The reduced diameter portion 22 is provided with a gas injection control mechanism 23. The gas injection control mechanism 23 controls injection of the liquefied carbon dioxide gas filled in the container main body 21.

  As shown in FIGS. 4 and 6, the gas injection control mechanism 23 includes a valve housing 25 in which a needle valve 24 having a tapered tip end is disposed so as to be able to advance and retract. This valve housing 25 has a housing body 25a formed in a cylindrical shape to be inserted into the reduced diameter portion 22, and a needle valve 24 is disposed in the housing body 25a so as to be able to advance and retract. A gas injection hole 26 is formed at the upper end of the housing body 25a. The gas injection hole 26 is sealed by fitting a sealing portion 24a formed in a tapered shape on the distal end side of the needle valve 24 disposed in the housing body 25a so as to be able to advance and retreat.

  The needle valve 24 is housed in a housing body 25a, supported by a moving body 27 whose movement direction is guided by the housing body 25a, and moves integrally with the moving body 27 to open and close the gas ejection holes 26. In the needle valve 24, the movable body 27 supporting the needle valve 24 is pressed and urged by a valve urging spring 28 constituted by a compression coil spring, so that the sealing portion 24a is fitted in the gas ejection hole 26. The gas ejection hole 26 is sealed by being moved and urged in the direction of the movement. The valve urging spring 28 serves as a first urging member of a pressure control mechanism that controls the pressure of carbon dioxide gas injected from the gas storage container 2. In the present embodiment, the valve urging spring 28 is constituted by a compression coil spring, but may be constituted by any spring member as long as it can press and urge the needle valve 24.

A valve urging spring 28 for urging the movable body 27 is disposed between the movable body 27 and a spring support member 29 attached to the lower end side of the housing body 25a. _A pressing force is applied toward the gas ejection hole 26 in _one direction. The spring support member 29 has a through hole 30 for gas circulation.

  Further, as shown in FIG. 6, a gas distribution groove 27 a is formed on the outer peripheral surface of the moving body 27 to distribute the liquefied carbon dioxide filled in the container main body 21 toward the injection hole 26.

  By the way, the needle valve 24 is formed in such a length that the front end side of the sealing portion 24a protrudes from the gas ejection hole 26 when disposed in the housing body 25a. The tip end side of the needle valve 24 protruding from the gas ejection hole 26 is operated to move the needle valve 24 against the urging force of the valve urging spring 28 to open the gas ejection hole 26 as will be described later. It is used as a pressing operation unit 32 operated by the pressing operation mechanism 31.

  Further, the pressing operation portion 32 enters the upper end side of the housing 25 from which the pressing operation portion 32 of the needle valve 24 protrudes, and the pressing operation element 33 of the pressing operation mechanism 31 for pressing the pressing operation portion 32 enters. A cylindrical operation element insertion portion 34 is formed. The pressing operator insertion portion 34 also functions as a gas flow path for the vaporized carbon dioxide gas injected from the gas injection hole 26.

  As described above, the valve housing 25 disposed so as to accommodate the needle valve 24 is fitted so that the housing main body 25a is inserted into the reduced diameter portion 22 of the container main body 21, and the upper end side of the housing main body 25a is fitted. The flange portion 36 integrally formed on the outer periphery is disposed on the container body 21 so as to abut on the upper end surface of the reduced diameter portion 22. As shown in FIG. 4, the valve housing 25 disposed in the container body 21 is supported by a support cap 37 attached so that the flange portion 36 is fitted to the outer peripheral side of the reduced diameter portion 22. 21 is attached integrally. At this time, the container main body 21 is sealed by the flange portion 36 of the valve housing 25 and the support cap 37 that supports the flange portion 36 so that no gas leakage occurs.

  A through hole 38 for projecting the operation element insertion portion 34 is formed in the center portion of the support cap 37. The operation element insertion portion 34 protrudes from the support cap 37 through the through hole 38 when the valve housing 25 is fixed to the container body 21 by the support cap 37.

  The support cap 37 that fixes the valve housing 25 to the container body 21 is provided with a pressing operation mechanism 31 that presses the needle valve 24 and opens and closes the injection hole 26. As shown in FIG. 4, the pressing operation mechanism 31 includes a piston 39 provided with a pressing operator 33 for pressing the pressing operation portion 32 of the needle valve 24, and a cylinder disposed so that the piston 39 advances and retreats. A piston housing 41 in which the portion 40 is formed, a piston pressing spring 42 that presses the piston 39 in a direction to press the needle valve 24 against the biasing force of the valve biasing spring 28, and the piston pressing spring 42 is pressed And an injection hole opening / closing knob 43 for applying an urging force in a direction of pressing the needle valve 24 to the piston 39.

  Here, the piston pressing spring 42 constitutes a second urging member of a pressure control mechanism that controls the pressure of the carbon dioxide gas injected from the gas storage container 2.

  The piston housing 41 constituting the pressing operation mechanism 31 has a fitting mounting portion in which a fitting recess 44 that fits on the outer peripheral side of the support cap 37 is formed on the base end side of the cylinder portion 40 in which the piston 39 advances and retreats. 45 is provided. A cylinder portion 40 in which the piston 39 advances and retreats is integrally formed above the fitting attachment portion 45. Further, on the upper side of the cylinder part 40, a movement guide part 47 in which a movement guide body 46 formed integrally with the piston 39 advances and retreats is integrally provided. The piston housing 41 is attached to the container body 21 by fitting the fitting recess 44 to the outer peripheral side of the support cap 37.

  The piston housing 41 is attached in a state where the space between the piston housing 41 and the support cap 37 is sealed so that no gas leaks from the support cap 37.

  As shown in FIG. 4, the piston 39 disposed in the cylinder portion 40 is integrally formed so that the pressing operation element 33 protrudes from the central portion on one end side, and the piston 39 on the other end side. A moving guide body 46 having a larger diameter is integrally provided. The piston 39 is disposed so as to advance and retract to the cylinder portion 40 by inserting the pressing operator 33 formed on one end side through the operator insertion portion 34. A piston ring 48 is fitted around the outer periphery of the piston 39 on the front end side, and moves forward and backward in the cylinder portion 40 with the cylinder portion 40 sealed.

  Further, when the piston 39 is disposed so as to be located in the cylinder part 40, the movement guide body 46 is located in the movement guide part 47.

  An injection hole opening / closing knob 43 formed in a cylindrical shape is attached to the distal end side of the piston housing 41 where the piston 39 is provided, where the movement guide portion 47 is provided. The injection hole opening / closing knob 43 is rotated on the outer peripheral side of the piston housing 41, and is rotated and moved forward and backward with respect to the piston housing 41.

  Between the top plate 50 of the injection hole opening / closing knob 43 movably attached to the piston housing 41 and the moving guide body 46 provided on the other end side of the piston 39 movably disposed in the piston housing 41, A piston pressing spring 42 constituted by a compression coil spring is interposed.

The piston pressing spring 42 is interposed between the injection hole opening / closing knob 43 and the piston 39 so that the needle valve 24 is pressed against the piston 39 against the urging force of the valve urging spring 28. imparting a biasing force of the arrow Y ₂ direction 4.

  By the way, when the injection hole opening / closing knob 43 is in the initial position shown in FIG. 4 where the injection hole opening / closing knob 43 is lifted with respect to the piston housing 41, the piston pressing spring 42 is in a free length state in which no load is applied to the piston 39, or While being pressed by the hole opening / closing knob 43, the needle valve 24 that is fitted to the injection hole 26 and is closed is opened against the urging force of the valve urging spring 28. A spring having a spring constant that does not move in the direction of movement is selected.

The piston push spring 42, the injection hole closing knob 43 relative to the piston housing 41 is operated to rotate the direction of arrow R ₁ in FIG. 3, to move so as to enter the piston housing 41 from the initial position, the injection hole opening knob undergo pressed in the direction 4 of which is compressed an arrow Y ₂ direction force by 43. Additionally here, the injection hole closing knob 43 when it is rotated in Fig. 3 in the direction of arrow R ₁ direction entering the piston housing 41, a compression load (Kgf) is applied compression piston pressure spring 42. When the compression load (Kgf) of the piston pressing spring 42 becomes larger than the biasing force of the valve biasing spring 28 that presses and biases the needle valve 24, the needle valve 24 resists the biasing force of the valve biasing spring 28 and the injection hole 26. Is moved in the opening direction, and the injection hole 26 is opened as shown in FIG. By opening the injection hole 26, the carbon dioxide filled in the container body 2 is injected through the injection hole 26.

  By the way, in the gas storage container 2 of the present embodiment, the liquefied carbon dioxide gas filled in the container main body 21 is injected from the injection hole 26 into the cylinder portion 40 of the piston housing 41 while being vaporized. The carbon dioxide gas injected into the cylinder part 40 flows out of the gas storage container 2 through a gas outflow hole 51 formed in the fitting attachment part 45 so as to communicate with the cylinder part 40. A connection plug 52 for connecting the conduit 3 is attached to the gas outflow hole 51. The conduit 3 is connected to the gas storage container 2 by fitting a connection socket 49 attached to the other end to the connection plug 52.

As described above, the gas storage container 2 used in the present embodiment receives the urging force of the piston pressing spring 42 that is expanded and contracted by the compression load (Kgf), via the piston 39 that moves in the cylinder portion 40. The injection valve 26 is opened and closed by pressing the needle valve 24 that advances and retracts in the valve housing 25 under the urging force of the valve urging spring 28. Therefore, when the piston pressing spring 42 is compressed and the urging force that presses the piston 39 becomes larger than the force that urges the needle valve 24 in the direction of closing the injection hole 26, the needle valve 24 comes out of the gas injection hole 26. 4 is moved in the direction of the arrow Y _{2 in} FIG. 4 to open the gas injection hole 26 as shown in FIG. That is, the tapered sealing portion 24a of the needle valve 24 moves to the container body 21 side to open the gas injection hole 26 as shown in FIG. And if the gas injection hole 26 is open | released, the liquefied carbon dioxide with which the container main body 21 was filled will be injected into the cylinder part 40, vaporizing.

When carbon dioxide gas is supplied to the cylinder portion 40 and the internal pressure of the cylinder portion 40 becomes larger than the urging force of the piston pressing spring 42 that presses the piston 39, the piston 39 is pressed so as to compress the piston pressing spring 42. When the piston 39 is pressed to compress the piston push spring 42, the piston 39 is moved in FIG. 5 in an arrow Y ₁ direction in a direction away from the needle valve 24. When the piston 39 moves in the direction of the arrow Y _{1 in} FIG. 5 and the pressure of the needle valve 24 is released, the needle valve 24 receives the biasing force of the valve biasing spring 28 and closes the injection hole 26 in FIG. It moves in the direction of the arrow Y ₁ and fits into the injection hole 26 to seal the injection hole 26 as shown in FIG. That is, as shown in FIG. 8, the sealing portion 24 a formed in a tapered shape of the needle valve 24 moves so as to fit into the gas injection hole 26 and closes the gas injection hole 26. And the supply of the carbon dioxide gas from the container main body 21 stops by sealing the injection hole 26. FIG.

  At this time, as shown in FIG. 7, the injection hole opening / closing knob 43 is placed in a state of being rotated to a lowered position that compresses the piston pressing spring 42 by a predetermined amount.

The carbon dioxide gas injected to the cylinder portion 40 side is used to operate the impact tool 1 described above and is released to the atmosphere, and the pressure in the cylinder portion 40 presses the piston 39. becomes smaller than the biasing force, the piston 39 receives a biasing force of the piston pressing spring 42 again, the needle valve 24 moves to the FIG. 5 arrow Y ₂ direction direction exiting from the gas injection holes 26 opens the gas injection holes 26 The liquefied carbon dioxide gas filled in the container body 21 is injected into the cylinder portion 40 while vaporizing.

When the injection hole opening / closing knob 43 is in the initial position shown in FIG. 4, the rotation in the direction of arrow R _{2 in} FIG.

As described above, in the gas storage container 2 used in the present embodiment, the opening and closing of the injection hole 26 is controlled when the pressure in the cylinder portion 40 changes. Therefore, when the pressure in the cylinder portion 40 exceeds a predetermined pressure, the piston pressing spring 42 that applies a biasing force that presses the needle valve 24 in the direction to open the injection hole 26 is compressed, and the piston 39 becomes the needle. by moving in Figure 7 arrow Y ₁ direction away from the valve 24, it can be radiated by controlling the carbon dioxide ejected from the container body 21 at a predetermined pressure.

In the gas storage container 2 of the present embodiment, the size of the surface receiving the pressure of the piston 39 that presses the needle valve 24 and the piston pressing spring 42 that presses and urges the piston 39 are appropriately selected to open and close the injection hole. By selecting a compression load corresponding to a change in the compression amount by the knob 43, it is possible to set an urging force for pressing the needle valve 24 in a direction in which the injection hole 26 is opened. The pressure to move the piston 39 to compress the piston pressing spring 42 in FIG. 7 in the arrow Y ₁ direction away from the needle valve 24, which piston 39 corresponds to the pressure in the cylinder 40 for advancing and retracting the cylinder unit This corresponds to the pressure of carbon dioxide radiated from 40 to the outside. Therefore, the pressure of the carbon dioxide gas radiated from the gas storage container 2 into the cylinder portion 40 can be controlled by controlling the biasing force that presses and biases the piston 39.

  Thus, in the gas storage container 2 of the present embodiment, the piston 39 that presses the needle valve 24 that controls the opening and closing of the carbon dioxide injection hole 26, the cylinder portion 40 that the piston 39 advances and retreats, and the piston 39 are A gas pressure control mechanism 55 that is a pressure control mechanism that radiates by controlling the carbon dioxide gas injected from the injection hole 26 to a certain range of pressure is constituted by the piston pressing spring 42 that presses and urges. By providing such a gas pressure control mechanism 55, in the gas storage container 2 of the present embodiment, the carbon dioxide gas filled in the container main body 21 is controlled to be decompressed to a predetermined pressure and the outside of the storage container 2. Can be emitted. In the present embodiment, the piston 39 and the piston pressing spring 42 are set so that the carbon dioxide gas is vaporized while being reduced from about 70 atmospheres of liquid carbon dioxide to a pressure of about 6 to 10 atmospheres. Yes.

  By the way, in the gas storage container 2 of the present embodiment, a piston opening portion 53 having a larger diameter is formed on the upper side of the cylinder portion 40 at a portion where the piston 39 normally advances and retreats. When the pressure of the cylinder portion 40 suddenly increases and becomes excessive pressure, the piston 39 is moved to the piston opening portion 53 against the urging force of the piston pressing spring 42, and the cylinder portion 40 is quickly opened. The high-pressure carbon dioxide gas injected into the cylinder part 40 is opened to the atmosphere to prevent matters such as the destruction of the gas storage container 2.

  A gas vent hole 54 is provided in the top plate 50 of the injection hole opening / closing knob 43 in order to quickly release the carbon dioxide gas released from the cylinder part 40 to the atmosphere.

  Furthermore, the gas storage container 2 of the present embodiment is provided with a body mounting tool for mounting the gas storage container 2 on the body of an operator who operates the high-pressure gas drive tool 1. This body wearing tool is, for example, a body wearing belt 56 that is inserted and attached to an insertion ring 57 provided on the outer peripheral surface of the container body 21. The belt 56 is wound around the body and fixed to the worker's body by fastening one end to a fastener 58 provided on the other end side, and the gas storage container 2 is attached to the body.

  A state in which staples are driven using the high-pressure gas driving device according to the present invention having the above-described configuration will be described.

  First, in order to drive the staple, the gas storage container 22 filled with the liquefied carbon dioxide gas and the conduit 3 are connected to the impact tool 1. In the conduit 3, the connection socket 18 provided on one end side is connected to the connection plug 17 of the impact tool 1, and the connection socket 49 on the other end side is connected to the connection plug 52 provided on the gas storage container 2. The gas storage container 2 and the impact tool 1 are connected to each other so that the carbon dioxide gas that is vaporized and injected from the gas storage container 2 can be supplied to the impact tool 1.

  Next, the body wearing belt 56 that supports the gas storage container 2 is worn on the worker's body to be worn on the worker's body.

  The conduit 3 may be connected to the impact tool 1 or the gas storage container 2 after the gas storage container 2 is attached to the body.

  By attaching the gas storage container 2 to the body, the operator holds the striking tool 1 and hits a desired staple without being restricted by the conduit 3 for supplying carbon dioxide gas to the striking tool 1. It can be moved freely to the insertion position.

Connecting the gas container 2 in the impact tool 1, where mounted on the body, rotating the injection hole closing knob 43 provided in the gas container 2 in FIG. 3 in the direction of arrow R _1. When the injection hole opening / closing knob 43 rotates from the initial position shown in FIG. 4 in the direction of the arrow R _{1 in} FIG. 3, the piston pressing spring 42 is compressed. Then, the injection hole opening / closing knob 43 is rotated by a predetermined amount in the direction of the arrow R ₁ , the piston pressing spring 42 is compressed, and the compression load (Kgf) of the piston pressing spring 42 presses and urges the needle valve 24. becomes greater than the biasing force of the spring 28, the needle valve 24 opens the injection hole 26 is shown in FIG. 4 in the direction indicated by the arrow Y ₂ direction to open the injection hole 26 against the urging force of the valve biasing spring 28.

  The piston pressing spring 42 is compressed by providing an index indicating the amount of rotation of the injection hole opening / closing knob 43 between the injection hole opening / closing knob 43 and the piston housing 41 to which the injection hole opening / closing knob 43 is rotatably mounted. The amount can be indicated. And the pressure of the carbon dioxide gas injected from the gas storage container 2 and supplied to the cylinder part 40 can be variably controlled within a certain range by appropriately setting the compression amount of the piston pressing spring 42.

  As described above, when the injection hole opening / closing knob 43 is rotated, the injection hole 26 is opened and the liquefied carbon dioxide filled in the container body 21 is vaporized from the injection hole 26 as shown in FIG. It is injected into the cylinder part 40. The carbon dioxide gas injected into the cylinder part 40 flows out into the conduit 3 through the gas outflow hole 51 and is stored in the gas storage chamber 7 of the impact tool 1 through the conduit 3. At this time, the gas storage chamber 7 has the same pressure as the cylinder portion 40. That is, the gas storage chamber 7 from the cylinder portion 40 is in a state of being filled with carbon dioxide gas reduced to a constant pressure.

  By the way, the conduit | pipe 3 used in order to guide | lead the carbon dioxide gas with which the gas storage container 2 was filled to the impact tool 1 has predetermined length. That is, according to the present invention, in order to operate the impact tool 1 in a state where the gas storage container 2 is mounted on the operator's body, the conduit 3 is operated by hand from the gas storage container 2 mounted on the body. It has a length necessary for connecting the striking tool 1, and the apparatus of the present embodiment has a length of about 1 to 2 m. And the conduit | pipe 3 is the state exposed to air | atmosphere in the use condition of the impact tool 1, and is made into the temperature close | similar to the temperature of the environment where this apparatus is used. Therefore, the liquefied carbon dioxide filled in the container body 21 is heated in the process of passing through the conduit 3 even if it is brought into a solid phase state by being abruptly injected while being decompressed from the injection hole 26. Is supplied to the impact tool 1 as carbon dioxide gas that has been vaporized and completely vaporized. In particular, the conduit 3 used in the present embodiment has a length of about 1 to 2 m in order to connect the gas storage container 2 and the impact tool 1 and is exposed to the atmosphere. Therefore, the carbon dioxide gas passing through the conduit 3 can be surely vaporized. Therefore, the conduit | pipe 3 comprises the vaporization promotion means.

  The conduit 3 is preferably made of a material having flexibility while having durability against high pressure.

When the carbon dioxide gas supplied from the gas storage container 2 is filled in the cylinder portion 40 from the gas storage chamber 7 of the impact tool 1 and the pressure in the cylinder portion 40 becomes equal to or higher than the set pressure, the piston 39 is moved to the cylinder portion 40. under pressure of filling carbonated gas to move the piston push spring 42 in Fig. 5 arrow Y ₁ direction to compress. When the piston 39 moves in the direction of the arrow Y _{1 in} FIG. 5 and the pressure of the needle valve 24 is released, the needle valve 24 moves in the direction of the arrow Y _{1 in} FIG. 5, and as shown in FIG. The urging force is received and fitted into the injection hole 26, and as shown in FIG. 8, the injection hole 26 is sealed, and the supply of carbon dioxide from the container body 21 is stopped.

  When the trigger valve operating lever 16 of the striking tool 1 is turned in a state where the gas storage chamber 7 is filled with carbon dioxide, the trigger valve 15 is actuated, and the head valve 14 is actuated in conjunction with this, and the striking cylinder 10 is operated. It is controlled to open the upper side of. When the upper side of the striking cylinder 10 is opened, the high-pressure carbon dioxide gas stored in the gas storage chamber 7 is supplied into the striking cylinder 10 and drives the striking tool 12 together with the striking piston 11, and the nose from the staple storage unit 9. The staple 4 fed to the section 13 is struck and driven into the material to be driven. Thereafter, when the trigger valve operating lever 16 is released, the trigger valve 15 is actuated again, and the head valve 14 is operated to close the upper side of the striking cylinder 10. At the same time, the striking cylinder 10 is connected to the atmosphere, and the striking piston. 11 returns to the initial position. When the striking cylinder 10 is connected to the atmosphere, the carbon dioxide supplied to the striking cylinder 10 is released to the atmosphere. When the striking cylinder 10 is connected to the atmosphere, the gas storage chamber 7 is also connected to the atmosphere, and the carbon dioxide gas stored in the gas storage chamber 7 is also released to the atmosphere.

  As described above, when the carbon dioxide gas stored in the gas storage chamber 7 is supplied to the striking cylinder 10 and the striking piston 11 is operated to complete a single staple 4 driving operation, the carbon storage gas is stored in the gas storage chamber 7. The carbon dioxide gas that has been discharged is released to the atmosphere, and the gas storage chamber 7 is at atmospheric pressure.

When the carbon dioxide gas stored in the gas storage chamber 7 is released into the atmosphere, the carbon dioxide gas in the cylinder portion 40 on the gas storage container 22 side connected to the gas storage chamber 7 through the conduit 3 is also released. The cylinder part 40 is at atmospheric pressure. When the cylinder unit 40 is reduced to atmospheric pressure, the piston 39 receives a biasing force of the piston pressing spring 42 moves to the FIG. 5 arrow Y ₂ direction, anti needle valve 24 to the biasing force of the valve biasing spring 28 Then, it moves in the direction of arrow Y ₂ in FIG. When the needle valve 24 is moved in the arrow Y ₂ direction in FIG. 5, as shown in FIG. 6, the injection hole 26 is opened, the cylinder portion 40 while vaporizing liquefied carbon dioxide filled in the gas container 2 In addition, the gas is supplied to the gas storage chamber 7 of the striking tool 1 through the conduit 3, and the striking tool 1 is placed in a driving standby state in which the staple 4 can be driven. At this time, the cylinder portion 40 on the gas storage container 2 side becomes equal to or higher than the pressure set by being filled with carbon dioxide gas, moving the piston 39 in the direction of the arrow Y _{1 in} FIG. 7 while compressing the piston pressing spring 42, The pressure of the needle valve 24 is released, the needle valve 24 is engaged with the injection hole 26 under the urging force of the valve urging spring 28, and the injection hole 26 is sealed as shown in FIGS. The supply of carbon dioxide from the container body 21 is stopped.

  By repeatedly supplying the carbon dioxide gas to the striking tool 1 as described above, exhausting the carbon dioxide gas by the striking operation of the staple 4 by the striking tool 1, and supplying the carbon dioxide gas to the striking tool 1, the staple 4 is sequentially driven. Executed.

  Then, when the carbon dioxide gas filled in the gas storage container 2 is exhausted by performing the driving operation many times, the staple storage operation is immediately continued by replacing the gas storage container 2 filled with carbon dioxide gas. can do. The exchange of the gas storage container 2 is performed by removing the connection socket 49 of the conduit 3 from the connection plug 52 and connecting it to the connection plug 52 of a new gas storage container 2. As described above, the replacement of the gas storage container 2 can be performed simply by replacing the connection socket 49 of the conduit 3, so that it can be performed easily in a short time. Can be performed without interruption, and a continuous driving operation can be realized.

  When the conduit is connected to the gas storage container 2 to be replaced, the connection socket 17 on the side connected to the impact tool 1 is replaced so that the conduit 3 connected to the impact tool 1 is also replaced. It may be.

  As described above, the high-pressure gas driving device using the striking tool 1 of the present embodiment uses carbon dioxide gas injected from the gas storage container 2 filled with liquefied carbon dioxide, which is a high-pressure gas that drives the striking tool 1. Since the gas pressure control mechanism 55 performs pressure reduction control and supplies the impact tool 1 to the impact tool 1, the impact tool 1 can be driven by the carbon dioxide gas whose pressure is controlled to a constant pressure, preventing overburden and the like to be stable and safe. Drive can be performed.

  Further, in the high-pressure gas drive device of the present embodiment described above, the conduit 3 can be deformed according to the posture in which the impact tool 1 is gripped by forming the conduit 3 from a material that can be bent and deformed. The driving operation in a stable posture can be performed without hindering the driving operation 4.

  In the above-described embodiment, the example in which the gas storage container 2 is filled with liquefied carbon dioxide has been described as the driving source. However, the high-pressure gas to be used is not limited to carbon dioxide, but high-pressure gas such as nitrogen gas. May be used.

  The present invention is not limited to the impact tool as described above, but is widely applied to a high-pressure gas drive tool using high-pressure gas as a drive source, and has the same advantages as those applied to the impact tool 1 described above. realizable.

DESCRIPTION OF SYMBOLS 1 Impact tool 2 Gas storage container 3 Conduit 4 Staple 7 Gas storage chamber 10 Impact cylinder 11 Impact piston 17 Connection plug 18 Connection socket 21 Gas storage container container main body 24 Needle valve 26 Gas injection hole 28 Valve biasing spring 39 Piston 40 Cylinder unit 41 Piston housing 42 Piston pressing spring 43 Injection hole opening / closing knob 51 Gas outflow hole 55 Gas pressure control mechanism

Claims (7)

A high-pressure gas drive tool driven using the pressure of the high-pressure gas;
A gas storage container filled with a high-pressure gas supplied to the high-pressure gas drive tool;
A pressure control mechanism for reducing the pressure of the high-pressure gas injected from the gas storage container,
A high-pressure gas drive apparatus using high-pressure gas as a drive source, wherein the high-pressure gas injected from the gas storage container is decompressed by the pressure control mechanism and supplied to the high-pressure gas drive tool.   2. The high-pressure gas drive device according to claim 1, wherein the pressure control mechanism is provided integrally with the gas storage container.   2. The high-pressure gas drive device according to claim 1, wherein the gas storage container is connected to the high-pressure gas drive tool through a conduit. The pressure control mechanism is
The gas container is movably disposed in a container main body filled with high-pressure gas, and is urged by a first urging member to urge the gas injection hole provided in the container main body. A needle valve
A second biasing member that presses and biases the piston that presses the needle valve in response to the biasing force of the second biasing member in a direction in which the needle valve is retracted from the gas injection hole;
The pressure of the high-pressure gas radiated from the injection hole to the outside of the container main body is controlled to be reduced by controlling a biasing force of a second biasing member that presses and biases the piston. The high-pressure gas drive device according to 1. The pressure control mechanism is
A needle valve that is movably disposed in a container main body filled with high-pressure gas in the gas storage container, and that opens and closes a gas injection hole provided in the container main body;
A first urging member that urges the needle valve to move in a direction to close the gas injection hole;
Connected to the container body and movably disposed in a cylinder portion to which high pressure gas injected from the gas injection hole is supplied, and presses the tip end side of the needle valve protruding from the injection hole to the cylinder portion side A piston to be operated;
A second biasing member that presses and biases the piston toward the needle valve side;
Urging member displacing means for variably controlling the displacement amount of the second urging member and controlling the pressing urging force of the piston;
2. The high pressure gas driving apparatus according to claim 1, wherein the pressure of the high pressure gas radiated to the cylinder portion is controlled by operating the biasing member displacing means to control the pressing biasing force of the piston. .   The cylinder part is provided in a piston housing connected to the container body, and the cylinder part is provided with a gas outflow hole so that a pressure-controlled high-pressure gas flows out through the gas outflow hole. 6. The high-pressure gas drive device according to claim 5,   The piston housing is provided with a piston opening portion continuous with the cylinder portion. When the pressure of the cylinder portion is excessive, the piston is resisted against the biasing force of the second biasing member. 7. The high-pressure gas drive device according to claim 6, wherein the cylinder portion is opened to the atmosphere by moving to the piston opening portion, and the high-pressure gas in the cylinder portion is released to the atmosphere.

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