JP5237508B1 - Power driven cutter - Google Patents

Abstract

  A cutting object can be easily cut using the combustion energy of LP gas filled in a commercially available cassette cylinder (LP gas cylinder). A combustion chamber 2 that explosively burns fuel gas, an actuator 3 that converts the expansion force of the combustion gas into linear kinetic energy, a cutting tool 4 a attached to an output rod 19 of the actuator 3, and a fuel gas in the combustion chamber 2 And a fuel gas supply pump 5 for supplying air at a constant rate, and a reaction force canceling means 6 for canceling the reaction force of the cutting tool 4a.

Description

  The present invention relates to a power-driven cutter for easily cutting an object to be cut, such as a branching operation for cutting off a tree branch or an oil palm harvesting operation.

  The manual cutting pruning scissors that cut off the branches at the height of the tree are designed to reduce the burden of human power by using a booster mechanism. However, there is a limit in manpower and the range of use is limited.

  On the other hand, as a device for harvesting oil palm, a cutting tool is attached to the distal end of a rod-like elongated connecting member, an engine is attached to the proximal end of the connecting member, and the power generated by the engine is used. There has been proposed a working machine for high places in which the cutting work tool is vibrated back and forth (see, for example, Patent Document 1).

  The above working equipment for high places reduces the cutting resistance of the cutting tool by vibrating the cutting tool back and forth, but the shaft and leaves of the oil insulator are cut by the manpower of the worker. It requires labor and requires advanced cutting skills.

  In addition, since the work implement for high places uses an engine (reciprocating internal combustion engine), the work implement for high places increases in weight and places a heavy burden on workers. Further, since a crank or an engine is used as means for vibrating the cutting tool back and forth, vibration and noise are large.

Japanese Unexamined Patent Publication No. 11-151684

  The present invention has been conceived under such circumstances, and as a problem, the object to be cut can be easily obtained by using the combustion energy of LP gas filled in a commercially available cassette cylinder (LP gas cylinder). It is to enable cutting, to shorten the cutting time for cutting the object to be cut, to reduce the fuel cost of the engine, to simplify the structure, and to improve the reliability.

  A power-driven cutter according to the present invention includes a combustion chamber that explosively burns fuel gas, an actuator that converts an expansion force of the combustion gas into kinetic energy in a linear direction, a cutting tool attached to an output rod of the actuator, and the combustion chamber Are provided with a fuel gas supply pump for supplying fuel gas and air at a constant ratio, and a reaction force canceling means for canceling the reaction force of the cutting tool.

  The reaction force canceling means includes a support bar attached to the body of the actuator and a reaction force receiving part provided in an L shape at the front end of the support bar.

  The reaction force receiving portion is provided with a cutter blade.

  The fuel gas supply pump comprises two pumps, a scavenging pump and a gas pump. The scavenging pump has a large diameter cylinder, a large diameter piston inscribed in the large diameter cylinder, and a large diameter piston mounted at the front end. A hollow medium-diameter rod, an end plate that seals both front and rear ends of the large-diameter cylinder, a sealing member that is attached to the rear end of the medium-diameter rod, and a handle that is attached to the sealing member. A medium-diameter rod, a small-diameter piston inscribed in the medium-diameter rod and positioned at the rear end of the medium-diameter rod, and a front end are attached to the back surface of the front end plate of the scavenging pump, and a rear end is the small diameter The scavenging pump has a front end plate including a gas inlet / outlet communicating with the air inlet / outlet and the small diameter rod, and the rear end plate includes the medium diameter rod. It has a through hole for sliding.

  A power-driven cutter according to the present invention has a combustion chamber that explosively burns fuel gas, an actuator that converts the expansion force of the combustion gas into kinetic energy in a linear direction, and a cutting tool that is mounted on the output rod of the actuator. In the driven cutter, an actuator is provided at the rear end portion of the combustion chamber, a relief valve is provided at the rear end portion of the actuator, a cylinder in which the relief valve is connected to the actuator, a piston provided in the cylinder, An exhaust port provided on a side surface of the actuator, a back pressure relief valve that is attached to the piston via a spring and opens and closes the exhaust port, and a bypass pipe that communicates the actuator and the cylinder. It is characterized by.

According to the present invention, the following effects can be obtained. That is,
(1) Since the object to be cut can be cut with one blow, the cutting time can be shortened.
(2) Since human power is not used for cutting the object to be cut, labor saving can be achieved.
(3) Since human power is not used to cut the object to be cut, advanced skills are not required for harvesting.
(4) The structure of the power driven cutter is simplified and the durability is increased.
(5) The structure of the power-driven cutter is simplified and maintenance is easy.
(6) The structure of the power driven cutter is simplified and the reliability is increased.
(7) Since LP gas filled in a commercially available 250 g cassette cylinder (LP gas cylinder) is used as fuel, there are few harmful exhaust gases and the environmental load is small.
(8) Low fuel costs and low maintenance costs.
(9) Noise is lower than that of a conventional reciprocating internal combustion engine.
(10) Lighter than conventional reciprocating internal combustion engines.

FIG. 1 is a plan view showing an example of a power-driven cutter according to the present invention. FIG. 2 is a plan view including a partial cross section of the power take-out means. FIG. 3 is a plan view including a partial cross section showing a cutting reaction force canceling means. FIG. 4 is a cross-sectional view of a fuel gas-air supply pump that supplies fuel gas and air at a constant ratio. FIG. 5 is a piping diagram of the power-driven cutter according to the present invention. FIG. 6 is an explanatory view of the cutting operation of the cutting object. FIG. 7 is a plan view showing another example of the power-driven cutter according to the present invention. FIG. 8 is a plan view showing another example of the power-driven cutter according to the present invention. 9A is a diagram showing an explosion combustion process, B is a diagram showing a stroke process, C is a diagram showing a return and exhaust gas replacement process, and D is a diagram showing a standby state. FIG. 10 is a plan view showing another example of the power-driven cutter according to the present invention.

2 Combustion chamber 3 Actuator 4a Cutting tool 5 Fuel gas supply pump 6 Reaction force canceling means 19 Output rod

  A power-driven cutter 1a according to the present invention includes a combustion chamber (gas explosion chamber) 2, an actuator 3, a cutting tool 4a, a fuel gas-air supply pump 5, and a cutting reaction force canceling means 6, as shown in FIG. It is configured.

  The combustion chamber 2 and the actuator 3 constitute a power take-out means 9a for pressing. The combustion chamber 2 is provided with a cassette cylinder (LP gas cylinder) 7 and an ignition igniter 8 in its body.

  The combustion chamber 2 is a device that instantaneously explosively burns a mixed gas in which combustion gas (LP gas) and air are mixed at a constant rate, and as shown in FIG. And two end plates 12 and 13 that seal both front and rear ends thereof.

  The front end plate 12 has an operating piston 14 of the actuator 3 inserted in a through hole provided at the center thereof, and is provided with a combustion gas discharge port 15 at a location deviated from the center. On the other hand, the rear end plate 13 includes a mixed gas supply port 16 and an ignition plug 17.

  The actuator 3 is a device that converts the expansion force of the combustion gas into a linear kinetic energy. As shown in FIG. It is comprised from the trunk | drum 18 and the output rod 19 provided in the front-end part of the said action | operation piston 14. As shown in FIG. The front end portion of the body portion 18 is closed by the end plate 20, but the front end portion of the output rod 19 protrudes from a through hole provided in the end plate 20. Reference numeral S <b> 1 indicates the stroke of the working piston 14.

  As shown in FIG. 3, the output rod 19 is connected to a cutting force transmission rod 21 having a predetermined length at its front end portion, and a cutting tool (cutting blade) 4 a is attached to the front end portion of the cutting force transmission rod 21. ing. The cutting tool 4a has a spatula-shaped blade body 24a having a wider width at the front end portion than at the root portion, and the front end portion is a sharp cutting edge 25 suitable for cutting the cutting object X. ing. Further, the front end portion of the output rod 19 and the cutting force transmission rod 21 are accommodated in the outer cylinder 22.

  The fuel gas-air supply pump 5 is a device for metering and supplying fuel gas and air to the combustion chamber 2 and includes a scavenging pump 31 and a gas pump 32 as shown in FIG.

  The scavenging pump 31 has a large-diameter cylinder 33, a large-diameter piston 34 inscribed in the large-diameter cylinder 33, a hollow medium-diameter rod 35 with the large-diameter piston 34 attached to the front end, and both front and rear ends of the large-diameter cylinder 33. A handle 39 is attached to a sealing member 38 that is composed of end plates 36 and 37 that are attached to the rear end of the medium diameter rod 35.

  The gas pump 32 is a pump having the medium diameter rod 35 as a cylinder, and a small diameter piston 40 is disposed in the medium diameter rod 35 at a position in contact with the medium diameter rod 35 and close to the sealing member 38. ing. A hollow small-diameter rod 41 attached to the center of the back surface of the front end plate 36 penetrates the small-diameter piston 40 and is fixed to the small-diameter piston 40.

  The front end plate 36 includes a gas inlet / outlet 43 communicating with the air inlet / outlet 42 and the small diameter rod 41. Further, the rear end plate 37 has a through hole for sliding the medium diameter rod 35. Reference numeral S <b> 2 indicates the stroke of the handle 39 or the large-diameter piston 34.

  The cutting reaction force canceling means 6 is a device that cancels the cutting reaction force of the cutting tool 4a, and as shown in FIG. 3, a rod-like support attached to the side surface of the outer cylinder 22 covering the cutting force transmission rod 21. It comprises a member 26 and a reaction force receiving portion 27 attached to the front end of the support member 26 in an L shape.

  FIG. 5 is a piping system diagram of a power-driven cutter according to the present invention, and the power-driven cutter 1 a includes a gas switching valve 51 and an exhaust gas switching valve 52. These switching valves 51 and 52 are simultaneously operated by a common manual handle 53.

  The gas switching valve 51 is a 2-port 2-position switching valve, and the A port is connected to the opening / closing valve 55 of the 250-g cassette cylinder 7 via a gas pipe 54. The gas pipe 54 includes a pressure reducing valve 56 at an intermediate portion thereof. On the other hand, the B port of the gas switching valve 51 communicates with the check valve 43 a at the gas inlet of the gas pump 32 via the gas pipe 57.

  The exhaust gas switching valve 52 is a 2-port 2-position switching valve, and the C port is connected to the combustion gas discharge port 15 of the combustion chamber 2 via the combustion gas discharge pipe 58. On the other hand, the D port of the exhaust gas switching valve 52 is connected to the exhaust gas discharge pipe 59.

  An ignition switch 60 provided in the vicinity of the exhaust gas switching valve 52 is electrically connected to the ignition igniter 8 via a wiring 61. The ignition igniter 8 is connected to the ignition plug 17 through one wiring 62 and connected to the combustion chamber 2 through the other wiring 63.

  The check valve 42 a at the air outlet of the scavenging pump 31 communicates with the check valve 16 a at the mixed gas supply port of the combustion chamber 2 via the gas pipe 64. The gas pipe 64 includes a gas mixer 65 at an intermediate portion thereof.

  The check valve 43 b at the gas delivery port of the gas pump 32 is connected to the gas pipe 64 on the upstream side of the gas mixer 65 via the gas pipe 66. In the figure, reference numeral 42b denotes an air inlet check valve.

  When harvesting the oil palm, the switch valve handle 53 shown in FIG. 5 is pushed to connect the A port and the B port of the gas switch valve 51 and the C port and the D port of the exhaust gas switch valve 52 are connected. By this operation, the residual gas in the combustion chamber 2 is discharged into the atmosphere, and the operating piston 14 of the actuator 3 is moved back into the combustion chamber 2 by its own weight as indicated by a solid line.

  Next, as shown in FIG. 6, while holding the power-driven cutter 1a with both hands, the L-shaped reaction force receiving portion 27 is inserted behind the shaft of the oil insulator x that is the object to be cut (n1).

  Next, the handle 39 of the pump 5 is pulled to introduce fuel LP gas into the gas pump 32, and at the same time, air is introduced into the scavenging pump 31, and the capacity of both is measured (n2).

  Next, the handle 39 of the pump 5 is pushed to supply the LP gas in the gas pump 32 and the air in the scavenging pump 31 to the combustion chamber 2 through the gas supply pipe 64 (n3). The LP gas and air are mixed while passing through the gas supply pipe 64, but are further uniformly mixed due to the presence of the gas mixer 65.

  Next, when the ignition switch 60 is operated to ignite the ignition plug 17, the mixed gas in which LP gas and air are mixed instantaneously explosively burns, and the working piston 14 of the actuator 3 is pushed forward. As shown in FIG. 3, the cutting tool 4a attached to the front end of the cutting force transmission rod 21 is pushed forward, and the axis of the oil insulator x, which is the cutting object, is instantaneously cut (n4).

  The reaction force resulting from the explosive combustion of the mixed gas is offset by the reaction force receiving portion 27.

  Thereafter, the steps (n1) to (n4) are repeated to harvest the oil palm.

  At that time, the palm leaves are also appropriately cut and removed. After the harvesting operation is completed, the selector valve handle 53 is pulled back to the initial position.

  A cutter blade is attached to the reaction force receiving portion 27, and the reaction force is used as cutting energy. As a result, the power can be reduced, the cylinder size can be reduced, and the weight can be reduced.

  Hereinafter, other embodiments will be described. In addition, the same code | symbol is attached | subjected to the same member as the member of 1st Embodiment, and detailed description is abbreviate | omitted.

  First, a second embodiment of the present invention will be described. As shown in FIG. 7, the power-driven cutter 1 b has a push rod 28 mounted in a T shape on the front end of the cutting force transmission rod 21, and a sickle-shaped cutting tool 4 b on the front end of the support member 26. It is attached to the shape.

  Next, a third embodiment of the present invention will be described. As shown in FIG. 8, the power-driven cutter 1 c forms a power take-out means 9 c for cutting by providing an actuator 3 at the rear end of the combustion chamber 2.

  The output rod 19 which is one of the components of the actuator 3 passes through the combustion chamber 2 and is provided with a hook-shaped cutting tool 4c at the front end thereof. The blade 24c of the hook-shaped cutting tool 4c has a sharp cutting edge 25 on the output rod 19 side.

  The combustion chamber 2 includes a gas supply port 16 and an ignition plug 17 at the center of the trunk. The gas supply port 16 is connected to the opening / closing valve 55 of the cassette cylinder 7 via a gas supply pipe 71, and the ignition plug 17 is connected to an ignition device 68 via a wiring 67. The on-off valve 55 and the ignition device 68 of the cassette cylinder 7 are operated by a trigger 72.

  The combustion chamber 2 is provided with an exhaust piston 73 having an exhaust check valve therein. The exhaust piston 73 is disposed so as to be positioned at the front end portion of the combustion chamber 2 when the operating piston 14 of the actuator is positioned at the front end portion of the cylindrical body 18 of the actuator.

  The actuator 3 is provided with a relief valve 74 at its rear end. The relief valve 74 includes a cylinder 75 connected to the cylindrical body 18 of the actuator 3, a piston 76 provided in the cylinder 75, an exhaust port 77 provided on the side of the actuator 3, and the piston 76 via a spring. And a pressure relief valve 78 that opens and closes the exhaust port 77, a bypass pipe 79 that communicates the actuator 3 and the cylinder 75, and a trigger 80 that operates the relief valve 74.

  Further, the combustion chamber 2 is provided with an exhaust valve 69 and a trigger 81 for operating the exhaust valve 69 at a front end portion thereof, and an outside air intake valve 82 is provided at a rear end portion thereof.

  A trigger 72 for operating the opening / closing valve 55 and the ignition device 68 of the cassette cylinder 7, a trigger 80 for operating the relief valve 74, and a trigger 81 for operating the exhaust valve 69 are linked by an operation cord 70.

  Here, FIG. 8 also serves as a diagram showing the gas filling and ignition process. When the combustion gas supplied into the combustion chamber 2 is instantaneously explosively burned by ignition, as shown in the explosion process of FIG. 9A. The operating piston 14 moves backward in the direction of the rear end portion of the actuator 3, and the cutting object (not shown) is instantaneously cut by the pulling operation of the cutting tool 4c. At this time, the gas in the actuator 3 is released into the atmosphere from an exhaust port 77 provided in the actuator 3.

  As shown in FIG. 9B, when the working piston 14 reaches the rear end (stroke end) of the actuator 3, high-pressure combustion gas in the actuator 3 is introduced into the cylinder 75 of the relief valve 74 through the bypass pipe 79, The exhaust port 77 provided on the side surface of the actuator 3 is sealed by the exhaust pressure relief valve 78.

  Next, as shown in the return and exhaust gas replacement step in FIG. 9C, when the trigger 80 of the relief valve 74 is tilted to the combustion chamber 2 side, the trigger 81 provided at the front end of the combustion chamber 2 causes the front end of the combustion chamber 2 to The provided exhaust valve 69 is opened, and the combustion gas in the combustion chamber 2 is discharged into the atmosphere. At the same time, the combustion gas in the relief valve 74 provided at the rear end of the actuator 3 flows back to the actuator 3 through the bypass pipe 79. Then, as shown in FIG. 9D, the operating piston 14 of the actuator 3 returns to the initial position (standby step).

  Next, a fourth embodiment of the present invention will be described. As shown in FIG. 10, in the power driven cutter 1 d, the cutting tool 4 d includes a fixed blade 91 and a movable blade 92.

  The fixed blade 91 is fixed to a support member 94 mounted on the upper end portion of the support bar 93 so as to protrude obliquely upward, and the movable blade 92 is rotatable to the support member 94 by two long and short rings 95 and 6. It is attached.

  One end of the short ring 96 is pivotally attached to the support member 94, and the other end is pivotally attached to the central portion of the movable blade 92. On the other hand, the center part of the long ring 95 is pivotally attached to the support member 94. Further, one end thereof is pivotally attached to the rear end portion of the movable blade 92, and the upper end of the connecting rod 97 is pivotally attached to the other end. Here, symbol α indicates the rotation angle of the short ring 96, and β indicates the rotation angle of the long ring 95.

  The support bar 93 is provided with a lever 98 at an intermediate portion thereof. The lever 98 is pivotally attached to the lower end of the connecting rod 97.

  The lever 98 has a cutting force transmission rod 21 pivotally attached to the end thereof. Reference numeral 14 denotes an operating piston provided on the power transmission rod 21, and this operating piston 14 is an actuator provided at the rear end of a combustion chamber (not shown), like the operating piston 14 of the third embodiment. (Not shown).

Claims (5)

  A combustion chamber that explosively burns fuel gas, an actuator that converts the expansion force of combustion gas into linear kinetic energy, a cutting tool attached to the output rod of the actuator, and a fixed ratio of fuel gas and air in the combustion chamber A power-driven cutter comprising: a fuel gas supply pump that is supplied in step 1; and a reaction force canceling means that cancels a reaction force of the cutting tool.   2. The power drive type according to claim 1, wherein the reaction force canceling means comprises a support rod attached to the body of the actuator and a reaction force receiving portion provided in an L shape at the front end of the support rod. cutter.   The power driven cutter according to claim 2, wherein a cutter blade is provided in the reaction force receiving portion. The fuel gas supply pump includes two pumps, a scavenging pump and a gas pump,
The scavenging pump includes a large-diameter cylinder, a large-diameter piston inscribed in the large-diameter cylinder, a hollow medium-diameter rod having the large-diameter piston attached to a front end, an end plate that seals both front and rear ends of the large-diameter cylinder, A sealing member attached to the rear end of the medium-diameter rod, and a handle attached to the sealing member;
The gas pump is mounted on the back surface of the front end plate of the scavenging pump, with the medium diameter rod, a small diameter piston inscribed in the medium diameter rod and positioned at the rear end of the medium diameter rod, and a front end. The end consists of a hollow small-diameter rod that penetrates the small-diameter piston,
The front end plate of the scavenging pump includes a gas inlet / outlet communicating with an air inlet / outlet and the small-diameter rod, and the rear end plate has a through hole for inserting the medium-diameter rod. 1 A power-driven cutter.   A power-driven cutter having a combustion chamber for explosively burning fuel gas, an actuator for converting an expansion force of the combustion gas into linear kinetic energy, and a cutting tool attached to an output rod of the actuator. An actuator is provided at the rear end portion, and a relief valve is provided at the rear end portion of the actuator. The cylinder to which the relief valve is connected to the actuator, a piston provided in the cylinder, and an exhaust port provided in the side surface of the actuator A power-driven cutter, comprising a back pressure relief valve attached to the piston via a spring and opening / closing the exhaust port, a bypass pipe communicating the actuator and the cylinder.

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