Cutting machine

Abstract

To provide a cutting machine which can reduce the influence of heat on a worker during cutting work even if it is an engine-driven type, and can improve workability even in midsummer. [Solution] In an engine-driven cutting machine 1 that cuts the target road surface by moving while rotating the blade 4 at high speed, to which the rotational force of the engine is transmitted via a power transmission unit 6, the cutting machine body 10 is equipped with an engine 2, a fuel tank T, a battery 3, and an exterior cover 12 that covers these onboard equipment on a body 11 that can move on wheels W.A small cooler 30 powered by a battery is installed via an inverter 40 or converter on a platform 20 that is detachably attached to the top surface of the exterior cover.

Description

[Technical Field]

[0001] This invention relates to a cutting machine for cutting road surfaces such as concrete and asphalt, and more particularly to a cutting machine equipped with a small cooler that is powered by power supplied from the cutting machine body. [Background technology]

[0002] When repairing or expanding road or parking lot pavement, or removing it in preparation for laying new pavement, a cutting machine is used to cut the old concrete or asphalt. This cutting machine is a device that inserts a disk-shaped blade downward into the target surface of asphalt or concrete and cuts it using the power of an engine.

[0003] Its basic structure is a carriage-like machine body that can travel, equipped with an engine and a fuel tank that supplies fuel to the engine, and a blade that is rotated at high speed by the rotational driving force from the engine, which cuts concrete or asphalt while the machine travels. A blade that is suitable for the object to be cut is attached (see, for example, Patent Document 1).

[0004] Typically, in such cutting machines, the engine is started and stopped using control levers, and the blade rotation speed is adjusted by operating a throttle. The operator then pushes the cart across the road surface, rotating the blade to cut the road surface. The engine's rotational force is transmitted to the blade's rotating shaft by a power transmission mechanism consisting of a belt and a pulley.

[0005] A battery is mounted inside the cutting machine, and supplies power to electrical components such as an electric hydraulic pump that drives a hydraulic cylinder mechanism to raise and lower the blade, an electric ignition that starts the engine, an electric motor that drives the fuel pump, various sensors, indicator lamps, etc. This battery is usually charged by the power generated by the rotational force of the engine.

[0006] In recent years, such cutting machines have also become increasingly electric, and electric models have been developed that use motor power instead of engines to cut concrete or asphalt.

[0007] However, engine-powered tools still have an advantage over electric tools in that they offer higher power and cutting capabilities for long-term work in locations where it is difficult to secure a power source. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Utility Model Registration No. 3052653 Summary of the Invention [Problem to be solved by the invention]

[0009] However, when a cutting machine is driven, the engine and exhaust pipe become extremely hot.

[0010] Therefore, the aircraft is covered to prevent workers from being burned by contact with hot parts. This cover not only prevents accidents such as getting caught in rotating parts such as belts in the power transmission mechanism, but also protects the onboard equipment from external impacts.

[0011] However, such covers do not completely block heat, and workers are still affected by the heat for long periods of time. This can create a particularly harsh working environment in the summer, which not only reduces work efficiency but also has a negative impact on the health of workers.

[0012] In view of the above problems, the object of this invention is to provide a cutting machine that, even if it is engine-driven, can reduce the impact of heat on the operator during cutting work and improve workability even in midsummer. [Means for solving the problem]

[0013] In order to achieve the above object, the cutting machine according to the invention described in claim 1 is an engine-driven cutting machine that cuts a target road surface by traveling while rotating a disk-shaped blade at high speed, which is detachably attached to the cutting machine body and to which the rotational force from the engine is transmitted via a power transmission unit, as shown in Figures 1 to 4. The cutting machine body is equipped with an engine, a fuel tank that supplies fuel to the engine, a battery that supplies power to peripheral electrical equipment and stores electricity generated by the rotational force of the engine, and an exterior cover that covers these mounted devices. Further, a stand is provided which is detachably attached to an upper surface of the exterior cover, A small cooler driven by the battery as a power source is installed on the stand via an inverter or a converter.

[0014] According to the cutting machine of claim 1 of the present invention, a battery mounted on the cutting machine body is used as a power source to drive a small cooler mounted on a stand on the top of the exterior cover, allowing the operator to cool off with the cool air blown out from the small cooler throughout the cutting operation. This reduces the impact of heat generated by the engine even in midsummer, preventing a decrease in work efficiency due to heat.

[0015] The cutter body of the present invention can be made from an existing cutter. Simply attach a stand to the top of the exterior cover of the existing cutter, place a small cooler on top of it, and connect it to a battery via an inverter or converter with an appropriate power supply circuit to easily create the cutter of the present invention.

[0016] The cutting machine can be either a manual type or a semi-self-propelled type, and the cutting machine body of this invention can be of either type. Normally, in a semi-self-propelled type, the clutch lever is operated to switch from manual to self-propelled, and the rotational force of the engine is transmitted to the wheels of the machine, assisting the movement of the cutting machine body.

[0017] The battery used in this invention can be a standard one commonly used in automobiles, in this case a 12V or 24V direct current (DC) power supply. In this invention, an inverter or converter is installed between the battery and the battery, so the type of small cooler can be selected appropriately without any restrictions.

[0018] That is, if the small cooler to be installed is an alternating current (AC) type, connecting an inverter between the battery and the cooler will allow the direct current from the battery to be converted into a predetermined AC voltage and supplied. For example, connecting an inverter to a 12V battery will allow 100V direct current to be supplied to the small cooler. Also, if the small cooler is a DC type, a DC-DC converter can be connected.

[0019] In reality, instead of connecting only the inverter circuit or DC-DC converter circuit as a converter to a battery and a small cooler, a power supply circuit device with safety measures added to the converter circuit is used. Products known as inverter boxes or DC-DC converter boxes are commercially available as such power supply circuit devices, and using these is convenient.

[0020] For example, an inverter box is a product that integrates not only the inverter circuit and control board inside, but also protection circuits with low-voltage protection functions that automatically cut off power supply when the voltage drops below a certain level to prevent the battery from running out, overload protection functions for the inverter circuit, overcurrent protection functions, and cooling functions such as a cooling fan.By simply connecting the DC input terminal of this inverter box to a battery and connecting the power plug of a small cooler to the AC output outlet of the inverter box, you can operate the small cooler safely and stably.

[0021] Furthermore, since engines are usually started by an electric ignition that uses battery power, a relay is placed between the ignition system circuit, which is supplied with power only when the engine is started, and the inverter box, which is an independent power supply circuit for the small air conditioner, and a signal line triggered by turning the ignition key to start the electric ignition drives the relay, which controls the power supply to the inverter box and small air conditioner, so that the operation of the small air conditioner can be linked to the operation of the engine.

[0022] Specifically, the switch part of the relay is connected to the cable that connects the positive terminal of the battery to the inverter box, and a signal wire branched off from the terminal of the ignition switch through which current flows only when the engine is started is connected to one side of the coil of the relay, and the other terminal of the coil is connected to the negative earth of a metal part of the aircraft or the like.

[0023] In this electrical connection circuit, when an operator turns the ignition key to the "start" position to start the engine, electricity flows from the ignition switch to the relay coil, activating the relay, which connects the battery and inverter box power supply circuit and starts the small air conditioner.

[0024] Normally, the ignition key returns to the "ON" position after the engine starts, but at this time, current continues to be supplied to the "ON" terminal of the ignition switch, so the relay is also in the ON state, which allows the small air conditioner to continue operating while the engine is running.

[0025] When the ignition key is turned from the "ON" position to the "OFF" position to stop the engine, the current supply to the "ON" terminal of the ignition switch is cut off, which also cuts off the power supply to the coil of the relay, turning the relay OFF. This cuts off the power supply from the battery to the inverter box and stops the small air conditioner from operating.

[0026] Also, if the target small cooler is DC-driven, a DC-DC converter box can be used, which changes the conversion circuit of the inverter box to a DC-DC converter circuit.

[0027] The top surface of the exterior cover is not necessarily flat, but by attaching the stand, a flat installation surface for the small cooler can be ensured. The stand can be attached to the exterior cover simply and conveniently by fastening it with bolts near multiple corners. Adjusting the height of these bolts allows for a more level installation of the stand.

[0028] Furthermore, since the cutting machine vibrates during operation, it is advisable to bolt each piece of equipment to the bottom of its housing in order to ensure a more stable mounting of the small cooler and inverter box or DC-DC converter box on the stand.

[0029] As shown in FIG. 5, the cutting machine according to the invention of claim 2 has an exterior cover provided with an openable door on the top surface, and a frame member fixed to the airframe under the exterior cover to support the onboard equipment, a swing stopper is provided for the door to be releasably engaged with a predetermined portion of the frame member facing the door, thereby preventing the door from swinging relative to the frame member; The vibration prevention portion is It is characterized by having a cylindrical member protruding from the predetermined portion of the frame member, and a columnar member protruding from the back surface of the door and inserted into the cylindrical member when the door is closed.

[0030] The cutting machine body of this invention, like conventional cutting machines, has an exterior cover with an openable door on top, allowing access to the various components inside the machine body. In addition, the onboard components are usually supported by a frame member fixed to the machine body under the exterior cover.

[0031] Therefore, this door may vibrate slightly relative to the frame member due to vibrations caused by the cutting machine during operation. In other words, the stand mounted on it may also vibrate at the same time as the door, causing the small cooler and inverter or converter mounted on the stand to sway sideways, which may hinder a stable mounting state.

[0032] In contrast, according to the cutting machine described in claim 2 of the present invention, a vibration prevention part is provided to prevent the door from vibrating relative to the frame member, so that the stand does not vibrate via the door due to vibrations that occur during operation of the cutting machine, and the stability of the installation state of the small cooler on the stand is maintained.

[0033] In addition, since the anti-sway device in this device is mainly composed of a cylindrical member protruding from the predetermined portion of the frame member and a column member protruding from the back surface of the door and inserted into the cylindrical member when the door is closed, it is only necessary to fix the cylindrical member and the column member in their corresponding positions before installing the rack. Moreover, simply by closing the door, the column member is inserted into the cylindrical member and the engagement is completed, making it easy to transition to the anti-sway state. [Effects of the Invention]

[0034] As explained above, this device is a small cooler that is powered by a battery installed in the engine-driven cutting machine body and is placed on a stand attached to the top surface of the exterior cover of the cutting machine body.Therefore, even in the middle of summer, workers can be cooled by the cool air from this small cooler, which reduces the impact of heat generated by the cutting machine during work and prevents a decrease in work efficiency. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a front view showing the schematic configuration of a cutting machine according to an embodiment of the present invention; [Figure 2] FIG. 2 is a side view showing the cutting machine of FIG. 1 in use. [Figure 3] FIG. 2 is a front view illustrating the state before a small cooler is installed in the cutting machine of FIG. 1. [Figure 4] FIG. 2 is a block diagram showing a schematic outline of the configuration of the cutting machine shown in FIG. [Figure 5] 2A and 2B are explanatory diagrams showing the configuration of the anti-vibration section provided in the cutting machine of FIG. 1, in which (a) is a schematic diagram showing a state in which a columnar member is attached to the inside of the door, (b) is a partially enlarged view showing the columnar member of (a), (c) is a partial plan view showing a state in which a cylindrical member is attached to the top surface of a frame member, and (d) is a partial plan view showing a state in which the door of (a) is closed. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0037] <Embodiment> A cutting machine 1 according to one embodiment of the present invention is shown in FIGS.

[0038] In this embodiment, a small cooler 30 is mounted on a cutting machine main body 10. The cutting machine main body 10 may be an existing engine-driven cutting machine such as a concrete cutter or an asphalt cutter.

[0039] Therefore, the cutting machine main body 10 is configured by mainly mounting an engine 2, a fuel tank T that supplies fuel to the engine 2, a generator 5 such as an alternator that generates electricity using the rotational force of the engine 2, and a battery 3 that stores the generated electricity from the generator 5 and supplies power to peripheral electrical equipment on a cart-like body 11 that can be pushed by hand using wheels W, and these mounted devices are covered with an exterior cover 12.

[0040] The cutting machine body 10 is also equipped with a detachable and replaceable disk-shaped blade 4, to which rotational force from the engine 2 is transmitted via a power transmission unit 6. The power transmission unit 6 is composed of a pulley and a belt. The cutting machine body 10 moves while the blade 4 is pressed against the target road surface and rotates at high speed, thereby cutting the target road surface.

[0041] Furthermore, when the cutting machine body 10 is being pushed by hand, the rear side of the cutting machine body 10 that the operator 100 faces is an operating section with various levers and switches, just like a typical engine-driven cutting machine, and is also provided with a meter panel for displaying various meters.

[0042] Although not shown in detail, the main operating parts include a manual travel handle that controls the travel direction of the cutting machine body 10, a throttle lever that adjusts the rotation speed of the engine 2 to adjust the rotation speed of the blade 4, a change lever that switches the cutting machine body 10 between forward and reverse, and an ignition key 7 that starts the engine. In addition, a pair of rods 9 that the operator 100 can grasp are also provided to control the travel of the cutting machine body 10.

[0043] The meter panel is provided with a charge lamp for the battery 3, an oil lamp, an hour meter that records and displays the cumulative engine operating time, a tachometer that displays the engine 2 RPM in real time, etc. In addition, a fuel level gauge that displays the amount of fuel remaining in the fuel tank T, etc. are also provided on the back side.

[0044] The blade 4 is mounted on the cutting machine body 10 before starting the cutting operation, and the type of blade 4 depends on the material to be cut. For example, there are concrete cutter blades for cutting concrete and asphalt cutter blades for cutting asphalt, so the blade is selected as appropriate and used, and then removed from the cutting machine body 10 after use. The upper area of ​​the blade 4 is usually covered by a blade cover 14.

[0045] The cutting machine body 10 also uses a hydraulic cylinder as a lifting means (not shown) for displacing the blade 4 between a lower cutting position where it is pressed against the target road surface and an upper retracted position when not cutting. This is operated by an electric hydraulic pump that is switched and driven by operating a lifting lever provided on the operating section of the cutting machine body 10.

[0046] In this embodiment, a 100V AC-driven compact cooler 30 is installed on the cutting machine main body 10. If the battery 3 mounted on the cutting machine main body 10 is, for example, a 12V DC power supply, DC / AC conversion and voltage boosting by an inverter are required to drive the compact cooler 30. Therefore, in this embodiment, an inverter box 40 is interposed between the battery 3 and the compact cooler 30.

[0047] This inverter box 40 contains an inverter circuit (which is a converter) and its control board, a protection circuit with a low-voltage protection function that automatically cuts off the power supply when the voltage drops below a certain level to prevent the battery from running out, an overload protection function for the inverter circuit, an overcurrent protection function, etc., and a cooling fan, etc.

[0048] Therefore, by connecting the DC input terminal of this inverter box 40 to the battery 3 and connecting the power plug of the compact cooler 30 to the AC output outlet of the inverter box 40, the compact cooler 30 can be safely operated using the battery 3 as a power source.

[0049] In this embodiment, the small cooler 30 is set to be driven in conjunction with the operation of the engine of the cutting machine main body 10. That is, the switch portion of the relay 8 is connected to the middle of the cable connecting the positive terminal of the battery 3 to the inverter box 40, a signal line branching from a terminal of the ignition switch 7 through which current flows only when the engine 2 is started is connected to one side of the coil of the relay 8, and the other terminal of the coil is connected to the negative earth of the metal part of the machine body.

[0050] As a result, when an operator turns the ignition key to the "start" position to start the engine, electricity flows from the ignition switch 7 to the coil of the relay 8, activating the relay 8, which connects the power supply circuit between the battery 3 and the inverter box 40 and starts operating the small air conditioner 30. After the ignition key is returned to the "ON" position after the engine 2 has started, the relay remains energized in the ON state, and the small air conditioner 30 continues to operate while the engine is running.

[0051] When the ignition key is turned from the "ON" position to the "OFF" position to stop the engine 2, the current supply to the "ON" terminal of the ignition switch 7 is cut off, and the power supply to the coil of the relay 8 is also cut off, and the relay is turned off.

[0052] This cuts off the power supply from the battery 3 to the inverter box 40 and stops the operation of the compact cooler 30. With the above configuration, in this embodiment, the operation of the compact cooler 30 is linked to the operation of the engine 2.

[0053] In this embodiment, the small cooler 30 and the inverter box 40 are mounted on the cutting machine body 10 by being placed on a stand 20 that is bolted to the top surface 13 of the exterior cover 12. The top surface 13 of the exterior cover 12 of the cutting machine body 10 is not necessarily flat, but by attaching the stand 20, a flat surface is ensured as an installation surface for the small cooler 30 and the inverter box 40.

[0054] Furthermore, by bolting each housing of the small cooler 30 and the inverter box 40 to the frame 20, there is no risk of them shifting or falling off the cutting machine body 10 due to engine vibrations or rattles while the cutting machine body 10 is running.

[0055] When installing this compact cooler 30, the cool air outlet 31 is adjusted to a position facing the operator 100. Like other common compact coolers, the compact cooler 30 has the hot air outlet 32 ​​provided on the opposite side of the cool air outlet 31, and therefore, by setting the position in this way, the hot air outlet 32 ​​is naturally located on the opposite side of the operator 100, on the front side of the cutting machine body 10, making it less susceptible to the effects of hot air.

[0056] The top surface 13 of the exterior cover 12 to which the stand 20 is attached is provided with a relatively large door 15 that can be opened and closed to allow access to the equipment mounted on the cutting machine body 10.

[0057] Therefore, the stand 20 is essentially attached to this door 15. Normally, the equipment mounted on the cutting machine main body 10 is surrounded and supported by a frame member 16 connected to the machine body 11, and is covered with an exterior cover 12 attached to the outer periphery of this frame member 16.

[0058] The door 15 is supported on the upper surface of the frame member 16 below it. However, since it is not firmly fixed, the door 15 may vibrate and swing slightly relative to the frame member 16 due to vibrations caused by the engine running. Such vibrations of the door 15 may be transmitted to the small cooler 30 and the inverter box 40 via the frame 20 as lateral vibrations.

[0059] Therefore, in this embodiment, a vibration prevention portion is provided to prevent the door 15 from vibrating in order to ensure stable installation of the small cooler 30 and the inverter box 40. This vibration prevention portion is composed of a member that releasably engages between the door 15 and the frame member 16 located below it.

[0060] In this embodiment, as shown in Figure 5, a pillar-shaped member P is provided on the back surface of the door 15, and a cylindrical member C that receives the pillar-shaped member P is provided on the upper surface of the frame member 16, and when the door 15 is closed relative to the cutting machine body 10, the pillar-shaped member P is inserted into the cylindrical member C.

[0061] Specifically, a columnar member P is integrally formed on a plate-shaped base BP and stands vertically on the base BP. The columnar member P is inserted from the front side through a through hole formed at a predetermined position on the door 15, and the surface of the base BP around the columnar member P is abutted against the surface of the door 15 around the through hole and bolted in place.

[0062] Therefore, only the pillar-shaped member P protrudes from the rear surface of the door 15, and only the rear surface of the base BP is exposed from the front surface of the door 15.

[0063] On the other hand, a cylindrical member C is integrally formed on a plate-shaped base BC and stands upright vertically. The base BC is positioned so that the columnar member P can receive the cylindrical member C, and is bolted to the top surface of the frame member 16.

[0064] The insertion path of the columnar member P along the arcuate closing rotation of the door 15 is slightly inclined with respect to the central axis of the cylindrical member C. Therefore, the opening end of the cylindrical member C is inclined with respect to the central axis. This allows the columnar member P to be smoothly inserted into the cylindrical member C when the door 15 is closed.

[0065] With the above configuration, when the door 15 is closed, the columnar member P is inserted into the cylindrical member C and engaged, thereby restricting horizontal movement of the door 15 via the columnar member P. This suppresses lateral vibration of the door 15 caused by vibrations during operation of the cutting machine body 10, and also prevents lateral vibration of the small cooler 30 and inverter box 40 installed on the door 15 via the stand 20, maintaining a stable installation state. [Explanation of symbols]

[0066] 1: Cutting machine 2: Engine T: Fuel tank 3: Battery 4: Blade 5: Generator 6: Power transmission section 7: Ignition switch 8: Relay 9: Rod 10: Cutting machine body 11: Aircraft W:Wheel 12: Exterior cover 13:Top surface 14: Blade cover 15: Door 16: Frame member 20: Stand 30: Small cooler 31: Cold air outlet 32:Hot air outlet 40: Inverter box P: Columnar member BP: Base (of a columnar member) C: Cylindrical member BC: Base (of a cylindrical member) 100: Worker

Claims

1. An engine-driven cutting machine comprising a cutting machine body mounted on a carriage-like machine body that can travel on wheels and that includes an engine, a fuel tank that supplies fuel to the engine, a battery that supplies power to peripheral electrical equipment and stores electricity generated by the rotational force of the engine, and an exterior cover that covers these mounted devices, the cutting machine body being detachably attached to the cutting machine body, and which cuts a target road surface by traveling while rotating a disc-shaped blade to which the rotational force from the engine is transmitted via a power transmission unit at high speed, Further, a stand is provided which is detachably attached to an upper surface of the exterior cover, A cutting machine characterized in that a small cooler driven by the battery as a power source is installed on the stand via an inverter or a converter.

2. the exterior cover has an openable and closable door on the top surface, and a frame member fixed to the airframe below the exterior cover to support the onboard equipment, a swing stopper is provided for the door to be releasably engaged with a predetermined portion of the frame member facing the door, thereby preventing the door from swinging relative to the frame member; The vibration prevention portion is 2. The cutting machine according to claim 1, further comprising: a cylindrical member protruding from the predetermined portion of the frame member; and a columnar member protruding from the rear surface of the door and inserted into the cylindrical member when the door is closed.

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