Mobile cutting machine and power device replacement method for mobile cutting machine

Abstract

To provide a mobile cutting machine in which replacement of a power device can be completed in a short period, and a power device replacement method for the mobile cutting machine.SOLUTION: A mobile cutting machine comprises: a supply box 1 into which an object α to be cut is inputted; a presser 4 which presses the object α to be cut inputted into the supply box 1; a cutting board 5 which cuts the object α to be cut pressed by the presser 4; a hydraulic cylinder which operates the presser 4 and the cutting board 5; a hydraulic pump 12 which is used as a hydraulic generation source for the hydraulic cylinder; and a power device 11 which is used as power for the hydraulic pump 12. The machine has: a main base 7 on which the hydraulic cylinder is installed; a sub base 8 on which the hydraulic pump 12 and the power device 11 are installed; and connection means 9 which connects the sub base 8 to the main base 7. The sub base 8 can be detached from the main base 7 by releasing the connection by the connection means 9.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a mobile cutting machine for cutting and processing construction waste materials and the like, and a method for replacing the power unit of the mobile cutting machine. [Background technology]

[0002] There are cutting machines intended to compress and cut construction waste, discarded pipes, etc. For example, Patent Document 1 discloses a scrap metal press for producing compressed scrap blocks, which has an inclined feeder box, at least one compression device at the bottom of the feeder box that acts in a direction substantially transverse to the forward direction of the scrap metal, and a guillotine shearing device that separates the compressed scrap blocks, and the bottom of the feeder box is provided with a plate that moves back and forth at least temporarily in the vertical direction of the feeder box. There are two types of cut-off machines: stationary cut-off machines, which are primarily intended for long-term cutting processing at the same location, and mobile cut-off machines, which are easier to move than stationary cut-off machines and are primarily intended for cutting processing at temporary locations.Mobile cut-off machines are used, for example, for processing in places where it is difficult to install a stationary cut-off machine, such as places where foundation work is difficult, for supplementary processing when a large amount of waste is temporarily generated due to a major earthquake or other event and the processing capacity of a stationary cut-off machine is insufficient, and for stopgap processing when a stationary cut-off machine is replaced. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 12299 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0004] Cutting machines generally use hydraulic cylinders to operate various devices, such as shearing devices (cutting boards), and are equipped with a hydraulic pump as a hydraulic pressure source. In the case of stationary cutters, the power unit (power source) for the hydraulic pump is almost always an electric motor, but in the case of mobile cutters, an engine is often used, assuming use in places where it is difficult to secure a power source. When a mobile cutting machine is relocated, if maintenance of the power unit is required, it may be out of service for an extended period of time. Also, the power unit can be a bottleneck when relocating a mobile cutting machine, as it may be difficult to relocate a machine equipped with an electric motor to a location where it is difficult to secure a power source. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mobile cutting machine that allows the replacement of a power unit to be completed in a short period of time, and a method for replacing a power unit of a mobile cutting machine. [Means for solving the problem]

[0005] The mobile cutting machine of the present invention described in claim 1 is a mobile cutting machine comprising a supply box 1 into which the workpiece α is fed, a pressure device 4 that holds down the workpiece α fed into the supply box 1, a cutting board 5 that cuts the workpiece α held down by the pressure device 4, a hydraulic cylinder that operates the pressure device 4 and the cutting board 5, a hydraulic pump 12 used as a hydraulic pressure generating source for the hydraulic cylinder, and a power unit 11 used as power for the hydraulic pump 12, and is characterized in that it has a main base 7 on which the hydraulic cylinder is installed, a sub-base 8 on which the hydraulic pump 12 and the power unit 11 are installed, and a connection means 9 that connects the sub-base 8 to the main base 7, and the sub-base 8 can be detached from the main base 7 by releasing the connection made by the connection means 9. The present invention described in claim 2 is characterized in that, in the mobile cutting machine described in claim 1, the connection means 9 comprises a plate material 91 attached across the main base 7 and the sub-base 8, and bolts and nuts 92 that fix the plate material 91 to the main base 7 and the sub-base 8. The present invention described in claim 3 is characterized in that, in the mobile cutting machine described in claim 1, the power unit 11 is an electric motor 11A or an engine 11B, and the connection point between the main base 7 and the sub-base 8 is the same whether the power unit 11 is an electric motor 11A or an engine 11B. The present invention described in claim 4 is characterized in that, in the mobile cutting machine described in claim 3, when the power unit 11 is an electric motor 11A, the sub-base 8 is equipped with a hydraulic pump 12A and electric motor 11A together with equipment and piping that is not shared when the power unit 11 is an engine 11B, and when the power unit 11 is an engine 11B, the sub-base 8 is equipped with a hydraulic pump 12B and engine 11B together with equipment and piping that is not shared when the power unit 11 is an electric motor 11A. The method for replacing the power unit of a mobile cutting machine of the present invention described in claim 5 is a method for replacing the power unit 11 using a mobile cutting machine described in any one of claims 1 to 4, characterized in that the connection between the main base 7 and the secondary base 8 by the connection means 9 is released to separate the secondary base 8 from the main base 7, the main base 7 on which the hydraulic cylinder is installed is lifted or raised, the hydraulic pump 12 and power unit 11 that were previously used are replaced with the newly used hydraulic pump 12 and power unit 11 together with the secondary base 8, and the secondary base 8 on which the newly used hydraulic pump 12 and power unit 11 are installed is connected to the main base 7 by the connection means 9. The present invention described in claim 6 is characterized in that, in the method for replacing the power unit of a mobile cutting machine described in claim 5, the newly used hydraulic pump 12 and power unit 11 are installed on another sub-base 8 before starting the replacement work. [Effects of the Invention]

[0006] According to the present invention, it is possible to complete replacement of the power unit of a mobile cutting machine in a short period of time. [Brief explanation of the drawings]

[0007] [Figure 1] Schematic diagram of a mobile cutting machine according to an embodiment of the present invention. [Figure 2] FIG. 10 is a diagram showing an outline of the processing flow of the mobile cutting machine. [Figure 3] A photograph showing part of the connection between the main base and the sub-base [Figure 4] Schematic diagram showing the equipment to be installed on the sub-base [Figure 5] Schematic diagram showing another example of equipment arranged on the sub-base DETAILED DESCRIPTION OF THE INVENTION

[0008] The mobile cutting machine according to the first embodiment of the present invention is a mobile cutting machine comprising a supply box into which the workpiece is fed, a pressure device that holds down the workpiece fed into the supply box, a cutting board that cuts the workpiece held down by the pressure device, a hydraulic cylinder that operates the pressure device and the cutting board, a hydraulic pump used as a hydraulic pressure generating source for the hydraulic cylinder, and a power unit that is used as a power source for the hydraulic pump.The mobile cutting machine has a main base on which the hydraulic cylinder is installed, an auxiliary base on which the hydraulic pump and power unit are installed, and a connection means that connects the auxiliary base to the main base, and the auxiliary base can be detached from the main base by releasing the connection made by the connection means. According to this embodiment, the hydraulic cylinders and other components installed on the main base can be reused, and the hydraulic pump and power unit installed on the sub-base can be replaced, making it possible to complete the replacement of the power unit of the mobile cutting machine in a short period of time. The main base also includes frames on which machine bodies such as supply boxes and cutting machines are installed. In other words, the main base is basically made up of frames used to install devices, equipment, and piping that are not intended to be replaced, while the sub-base is made up of frames used to install devices, equipment, and piping that are intended to be replaced.

[0009] In the second embodiment of the present invention, in the mobile cutting machine of the first embodiment, the connection means comprises a plate material attached across the main base and the sub-base, and bolts and nuts for fixing the plate material to the main base and the sub-base. According to this embodiment, the sub-base can be firmly connected to and disconnected from the main base using simply configured connecting means.

[0010] The third embodiment of the present invention is a mobile cutting machine according to the first embodiment, in which the power unit is an electric motor or an engine, and the connection point between the main base and the sub-base is the same whether the power unit is an electric motor or an engine. According to this embodiment, even when the replacement of the power unit involves replacing an electric motor with an engine, or replacing an engine with an electric motor, the work can be completed in a short period of time.

[0011] The fourth embodiment of the present invention is a mobile cutting machine according to the third embodiment, in which, when the power unit is an electric motor, the sub-base is equipped with a hydraulic pump and electric motor together with equipment and piping that is not shared when the power unit is an engine, and when the power unit is an engine, the sub-base is equipped with a hydraulic pump and engine together with equipment and piping that is not shared when the power unit is an electric motor. According to this embodiment, the power unit replacement period can be shortened by integrating non-shared equipment and piping into the sub-base, and the power unit replacement cost can be reduced by reusing shareable equipment and piping.

[0012] A method for replacing a power unit of a mobile cutting machine according to the fifth embodiment of the present invention is a method for replacing a power unit in a mobile cutting machine according to any one of the first to fourth embodiments, which involves releasing the connection between the main base and the auxiliary base by the connecting means, separating the auxiliary base from the main base, lifting or raising the main base on which the hydraulic cylinder is installed, replacing the hydraulic pump and power unit that have been in use with the hydraulic pump and power unit to be newly used together with the auxiliary base, and connecting the auxiliary base on which the newly used hydraulic pump and power unit are installed to the main base by the connecting means. According to this embodiment, the hydraulic cylinders and other components installed on the main base can be reused, and the hydraulic pump and power unit installed on the sub-base can be replaced, making it possible to complete the replacement of the power unit of the mobile cutting machine in a short period of time.

[0013] The sixth embodiment of the present invention is a method for replacing the power unit of a mobile cutting machine according to the fifth embodiment, in which the newly used hydraulic pump and power unit are installed on a separate sub-base before the replacement work begins. According to this embodiment, by preparing a new hydraulic pump and power unit in advance on another sub-base, the time required for replacing the power unit can be further shortened. [Example]

[0014] Hereinafter, a mobile cutting machine according to an embodiment of the present invention will be described. Figure 1 is a schematic diagram of a mobile cutting machine, where Figure 1(a) is a side view of the machine installed at the location of use, Figure 1(b) is a side view of the machine loaded onto a trailer for relocation, Figure 1(c) is a top view of (a), and Figure 1(d) is a view taken along the arrow AA of (a). Mobile cutters (scrap processing machines) are used to compress and cut materials such as construction waste, pipes, and mixtures of these. The mobile cutting machine comprises a supply box 1 into which the material to be cut is fed from above, a feed slide device 2 that moves the bottom of the supply box 1 back and forth, a width-shifting device 3 that shifts the material to be cut that has been sent to the front of the supply box 1 to the center in the width direction, a pressure device 4 that presses down from above the material to be cut that has been shifted to the center in the width direction to prevent it from moving, a cutting board 5 that cuts the material to be cut while it is pressed down by the pressure device 4, a front cover 6 that prevents the material to be cut from flying out of the opening of the cutting board 5 before cutting, prevents pieces of the material to be cut from scattering during cutting, and adjusts the cutting length, a hydraulic cylinder that operates each device, a hydraulic pump 12 as the hydraulic pressure generation source for the hydraulic cylinder, and a power unit 11 for the hydraulic pump 12.

[0015] The dimensions of the supply box 1 are, for example, 2,000 (W) x 4,700 (L) x 1,700 (H). The bottom of the supply box 1 is an inclined surface that gradually decreases in angle from the rear to the front at an angle of approximately 20° so that the inserted material slides forward under its own weight. The bottom of the supply box 1 is configured to be reciprocable in the front-to-rear direction by a feed slide device 2 provided on the back side. A width-shifting device 3 is provided on the front side of the supply box 1. The width-shifting device 3 has a pair of width-shifting movable boards that protrude from the left and right sides onto the bottom surface of the supply box 1. A pressing device 4 that moves back and forth vertically relative to the bottom surface (inclined surface) of the supply box 1 is provided adjacent to the front of the width-shifting device 3. In order to shorten the stroke, the pressing device 4 has a three-stage configuration in which the amount of downward protrusion varies depending on the position, with the central portion protruding more than the rear portion, and the front portion protruding more than the central portion. The cutting board 5 has a moving blade 51 that is provided above the opening and moves back and forth in a substantially vertical direction, and a stationary blade 52 that is provided below the opening and does not move. The front cover 6 is provided in front of the cutting plate 5 and moves forward or backward in conjunction with the operation of the cutting plate 5 during cutting.

[0016] The feed slide device 2, the width adjustment device 3, the presser device 4, the cutting board 5, and the front cover 6 are operated by hydraulic cylinders connected to them, respectively. The hydraulic pump 12 is driven by the power unit 11 and supplies pressurized oil to each hydraulic cylinder. With the mobile cutting machine of this embodiment, for example, a user who uses the mobile cutting machine in a location where it is difficult to install a power supply or generator may select the engine 11B as the power unit, while a user who uses the mobile cutting machine in a location where a power supply or generator is installed may select the electric motor 11A. In other words, the power unit 11 to be installed can be selected to be either the electric motor 11A or the engine 11B, and regardless of which is selected, the capabilities and arrangement of the feed slide device 2, width adjustment device 3, presser device 4, cutting plate 5, front cover 6, and each hydraulic cylinder are the same.

[0017] The mobile cutting machine is equipped with four support legs 10, each at the front, back, left and right, which are extendable by hydraulic cylinders. When the mobile cutting machine is not being used for cutting processing or during transportation, each support leg 10 is extended downward and placed on the floor surface such as a surface plate, so that the main base 7 and sub-base 8 are separated from the floor surface (see Figure 1(a)). To further improve stability, a stand or the like may be used to support the main base 7 and sub-base 8 from below. On the other hand, during transportation, the support legs 10 are retracted upward and folded inward, so that the main base 7 and sub-base 8, on which the various devices and piping are installed, are in contact with the upper surface of the trailer bed (see Figure 1(b)). Note that the mobile cutting machine is generally transported assembled, rather than transporting each device individually and assembling it on-site. The cutting cylinder section 53, which has a hydraulic cylinder that operates the moving blade 51 of the cutting board 5, protrudes above the supply box 1 during use to ensure the stroke of the moving blade 51 (see Figure 1(a)). However, since a protruding state may violate road height restrictions, the height is lowered during transportation so that it is below the top surface of the supply box 1 (see Figure 1(b)).

[0018] FIG. 2 is a diagram showing an outline of the processing flow of the mobile cutting machine. Figure 2(a): With the front cover 6 in close proximity to the opening of the cutting board 5, the material α is fed continuously or discontinuously from above the supply box 1. The degree to which the front cover 6 is brought close to the opening of the cutting board 5 depends on the desired cutting length of the material α. The fed material α slides down the inclined surface under its own weight toward the opening of the cutting board 5 installed in front of the supply box 1, and stops when it hits the front cover 6. Figure 2(b): The bottom of the supply box 1 moves back and forth two or three times. As the bottom swings, the workpiece α that had not slipped down and remained at the rear of the supply box also slides down to the front. Figure 2(c): A pair of width-shifting movable plates of the width-shifting device 3, which had been retracted to the left and right sides of the supply box 1, gradually protrude above the bottom surface of the supply box, and as a result, the workpiece α is pushed from the left and right by the width-shifting movable plates and moves toward the center of the width of the supply box 1. Figure 2(d): The pressing device 4 descends to press down the object α, thereby fixing the object α in place. Figure 2(e): The front cover 6 moves backward away from the opening of the cutting board 5 and stops at the standby position. This standby position is a position where the front cover 6 does not interfere with the reciprocating motion of the moving blade 51 and can block fragments of the workpiece α from scattering around during cutting. FIG. 2(f): The moving blade 51 of the cutting board 5 descends to cut the object α. After cutting, a pressure release operation (an operation to release residual pressure in the hydraulic cylinder) is performed to prevent hydraulic shock, then the movable blade 51 rises, the width adjustment device 3 moves back to the left and right, the front cover 6 moves forward and approaches the opening of the cutting board 5, the pressing device 4 rises, and then the process returns to the stage where the workpiece α is inserted or the bottom surface of the supply box 1 moves back and forth, and each step is then repeated in the same manner.

[0019] The supply box 1, feed slide device 2, width adjustment device 3, presser device 4, cutting board 5, front cover 6, and hydraulic cylinder are installed on a main base 7. On the other hand, the hydraulic pump 12 and power unit 11 are installed on a sub-base 8 separate from the main base 7. The main base 7 and the sub-base 8 are connected by a connecting means 9, and can be separated by releasing the connection by the connecting means 9.

[0020] FIG. 3 is a photograph showing a part of the connection portion between the main base 7 and the sub-base 8. The main base 7 and the sub-base 8 are constructed in a framework shape, mainly made of steel members arranged in the width, length, and height directions. The connection points between the main base 7 and the sub-base 8 are, for example, the points where the ends of the steel members arranged in the length and height directions of the main base 7 and the sub-base 8 face each other. The connection means 9 in this embodiment is made up of a plate 91 that is attached across the steel material of the main base 7 and the steel material of the sub-base 8, and bolts and nuts 92 that secure the plate 91 to the steel material. A plurality of bolt holes are formed in the connection points between the plate 91 and the steel material, and the plate 91 that spans the main base 7 and the sub-base 8 is secured to the steel material by tightening the bolts and nuts 92. In this way, the simply configured connection means 9 can be used to firmly connect and disconnect the sub-base 8 to the main base 7.

[0021] The secondary base 8, on which the hydraulic pump 12, power unit 11, etc. are installed, is detachably connected to the main base 7, on which the cutting plate 5 and hydraulic cylinder are installed, so that the cutting plate 5, hydraulic cylinder, etc. can be reused, and the hydraulic pump 12 and power unit 11 that apply pressure to the hydraulic oil, as well as the equipment and piping for them (hereinafter referred to as the "power unit") can be replaced with new ones. Therefore, for example, when relocating a mobile cutting machine or when a malfunction occurs in the hydraulic pump 12 or power unit 11, by replacing the power unit, it is possible to start using the machine early without waiting for the completion of overhaul or repair of the hydraulic pump 12, power unit 11, etc. that had been in use until then.

[0022] Figure 4 is a schematic diagram from above showing the equipment placed on the sub-base 8, where Figure 4(a) shows the case where the power unit 11 is an electric motor 11A, and Figure 4(b) shows the case where the power unit 11 is an engine 11B. When an electric motor 11A is used as the power unit 11, the sub-base 8 is equipped with two electric motors 11A, two hydraulic pumps 12A connected to each electric motor 11A, a hydraulic oil tank 13A, an oil cooler 14A, and a control panel 15A for controlling the hydraulic pump 12A and the electric motor 11A. When an engine 11B is used as the power unit 11, the sub-base 8 is equipped with one engine 11B, three hydraulic pumps 12B connected in series to the engine 11B, a hydraulic oil tank 13B, an oil cooler 14B, a control panel 15B for the hydraulic pumps 12B and the engine 11B, and a fuel oil tank 16. The number and arrangement of each device are not limited to the example shown in FIG. 4, but are designed appropriately depending on the size, capacity, etc. of the mobile cutting machine.

[0023] 4, when an electric motor 11A is mounted as the power unit 11, the sub-base 8 is provided with a hydraulic pump 12A and control panel 15A for the electric motor 11A, as well as other equipment and piping that is not shared with the power unit 11 when the power unit 11 is an engine 11B. When an engine 11B is mounted as the power unit 11, the sub-base 8 is provided with a hydraulic pump 12B and control panel 15B for the engine 11B, as well as other equipment and piping that is not shared with the power unit 11 when the power unit 11 is an electric motor 11A. Note that some of the equipment and piping that can be shared, such as tank hydraulic oil filters provided in the hydraulic oil tanks 13A and 13B, may be installed on the sub-base 8. On the other hand, among the equipment and piping from the hydraulic pump 12 to the hydraulic cylinder, such as the hydraulic oil filter 17 and the hydraulic oil switching valve (solenoid valve) 18, those that can be used in common whether the power unit 11 is an electric motor 11A or an engine 11B are installed on the main base 7.

[0024] In this way, the time required for replacing the power unit can be shortened by collectively installing the equipment and piping that are not shared on the sub-base 8. In addition, by reusing the equipment and piping that can be shared, the cost required for replacing the power unit can be reduced. When consolidating the power units into the sub-base 8, the sub-base 8 is positioned below the supply box 1, which has a sloping bottom, and taller devices are placed at the rear of the sub-base 8, where the distance to the bottom of the supply box 1 is greater, and the arrangement of each device and equipment is devised.

[0025] FIG. 5 is a schematic diagram seen from above showing another example of equipment arranged on the sub-base 8 when the power unit is an engine. As shown in Figure 5, it is also possible to increase the size of the sub-base 8 and install on it the sharable equipment and piping from the hydraulic pump 12 to the hydraulic cylinder. In this case, these will also be replaced together with the power unit, eliminating the need to transfer the sharable equipment and piping to the new power unit and shortening the work period. Although FIG. 5 shows a case where the power unit 11 is an engine 11B, the same applies when the power unit 11 is an electric motor 11A.

[0026] Furthermore, the sub-base 8 is connected to the main base 7 at exactly the same point whether the power unit 11 is the electric motor 11A or the engine 11B. The connection means 9 used is also the same. This allows the sub-base 8 on which the power unit with the electric motor 11A is installed to be replaced with the sub-base 8 on which the power unit with the engine 11B is installed, and vice versa, so the replacement work can be completed in a short period of time. Therefore, for example, it becomes possible to respond flexibly to situations such as when a mobile cutting machine equipped with an electric motor 11A needs to be moved to a location where it is difficult to prepare a power supply and used, or when a mobile cutting machine equipped with an engine 11B needs to be moved to a location where a power supply and other facilities are available and used.

[0027] The main steps for replacing a power unit are as follows: (1) Drain fuel oil and hydraulic oil from the piping. (2) Disconnect the piping on the main base 7 from the piping on the sub-base 8. (3) The connecting means 9 connecting the main base 7 and the sub-base 8 is removed. (4) The supply box 1, cutting board 5, hydraulic cylinder, etc. are lifted or raised together with the main base 7. (5) Replace the power unit for each sub-base 8. (6) The supply box 1, cutting board 5, and hydraulic cylinder that were lifted along with the main base 7 are lowered to the new position of the sub-base 8. (7) Connect the main base 7 and the sub-base 8. (8) Connect the piping on the main base 7 to the piping on the sub-base 8.

[0028] It is desirable to replace the power unit of a mobile cutting machine in a factory with the necessary equipment, but it can also be done on-site (at the place of use). In addition, as a preliminary preparation for the replacement work, it is preferable to install a new hydraulic pump 12, power unit 11, etc. in advance on another sub-base 8. This can further shorten the work period for replacing the power unit. [Explanation of symbols]

[0029] 1 supply box 4 Presser foot device 5 Cutting board 7 Main Base 8 Sub-bass 9. Connection Methods 91 Board material 92 Bolts and Nuts 11 Power plant 11A electric motor 11B engine 12 Hydraulic pump α Object to be cut

Claims

1. a supply box into which the workpiece is fed; a pressing device that presses down the workpieces that have been put into the supply box; a cutting machine that cuts the workpiece held by the holding device; a hydraulic cylinder for actuating the presser device and the cutting board; a hydraulic pump used as a hydraulic pressure generating source for the hydraulic cylinder; A mobile cutting machine comprising: a power unit used as power for the hydraulic pump; a main base on which the hydraulic cylinder is installed; a sub-base on which the hydraulic pump and the power unit are installed; and a connecting means for connecting the secondary base to the primary base, The mobile cutting machine is characterized in that the sub-base can be separated from the main base by releasing the connection by the connecting means.

2. 2. The mobile cutting machine according to claim 1, wherein the connecting means comprises a plate attached across the main base and the sub-base, and bolts and nuts for fixing the plate to the main base and the sub-base.

3. the power unit is an electric motor or an engine; 2. The mobile cutting machine according to claim 1, wherein the connection point between the main base and the sub-base is the same whether the power unit is the electric motor or the engine.

4. The mobile cutting machine described in claim 3, characterized in that, when the power unit is the electric motor, the sub-base is equipped with the hydraulic pump and the electric motor, as well as equipment and piping that are not shared when the power unit is the engine, and when the power unit is the engine, the sub-base is equipped with the hydraulic pump and the engine, as well as equipment and piping that are not shared when the power unit is the electric motor.

5. A method for replacing a power unit in a mobile cutting machine according to any one of claims 1 to 4, disconnecting the main base from the sub-base by the connecting means; Lifting or raising the main base on which the hydraulic cylinder is installed; The hydraulic pump and the power unit that have been used until then are replaced with the hydraulic pump and the power unit that will be newly used, along with the sub-base; A method for replacing a power unit of a mobile cutting machine, characterized in that the sub-base on which the newly used hydraulic pump and power unit are installed and the main base are connected by the connecting means.

6. 6. The method for replacing a power unit of a mobile cutting machine according to claim 5, wherein the hydraulic pump and the power unit to be newly used are installed on another sub-base before starting the replacement work.

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