JPH07314236A - Portable shearing machine tool - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Various types of work such as cutting or drilling large diameter steel bars and thick plate materials, forming special shapes such as V notches, or bending steel materials. The present invention provides a portable machine tool that can be applied to a low cost and is lightweight with a compact structure. [Configuration] A portable shearing machine tool 1 includes a machine frame 2 and a machine frame 2
A hydraulic pump device which is supported by and is connected to a drive device, a hydraulic cylinder device 5, a movable tool 10 which is removably attached to its piston rod, and a fixed tool 11 which is detachably attached to a predetermined position of the machine frame. Have.
The drive device and the hydraulic pump device are arranged in line on the first axis XX of the machine frame 2 extending in the vertical direction, and the rotary drive shaft of the drive device rotates about the first axis. The hydraulic cylinder device 5 and the piston rod are aligned and arranged on the second axis Y-Y of the machine frame extending in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable shearing machine tool, and more particularly, to a machine tool having a novel construction which combines the advantages of a conventional portable shearing machine and a conventional large machine tool. It is a thing.

[0002]

2. Description of the Related Art A hydraulically operated shearing machine such as a hydraulically operated cutter for cutting a rod-shaped material such as a reinforcing bar or a hydraulically operated puncher for punching a plate-shaped material such as an iron plate is known. For example, Japanese Utility Model Publication No. 1-15464,
Japanese Utility Model Publication No. 57-13118, Japanese Patent Application No. 4-20408.
(See No. 2, etc.). Generally, such a shearing machine is provided with a main body supported by an operator with fingers, a tool such as a cutting blade or a punch attached to a piston rod, and a hydraulically actuated cylinder device for reciprocating the piston rod. There is. The shearing machine further has a pump mechanism and an electric motor that are arranged on the same axis as the hydraulic cylinder device, the electric motor drives the pump mechanism, and the pump mechanism supplies hydraulic oil to the hydraulic chamber, so that the cylinder device operates. Activate.
The pump mechanism includes a plurality of pump elements or pump units radially arranged around the rotation axis of the electric motor, and each pump element reciprocates by the rotation of the output shaft (eccentric shaft) of the electric motor. The hydraulic oil in the oil tank is fed to the hydraulic chamber of the cylinder device. Generally, workers carry this type of portable shears at a work site such as a construction site to cut rebars and all screw bolts, or to drill bolt holes in a strip or angle steel. Used for processing.

On the other hand, there are known large press machines or large shear machines for cutting and processing shaped steel such as strips and angle shaped steel. This type of large machine tool is permanently installed in a factory or the like and used for producing or manufacturing a large amount of processed products.

[0004]

However, in the above-mentioned portable shearing machine, the applicable range or size applicable range of the work or the workpiece is extremely limited. For example, the portable cutter can cut steel bars such as rebars having a predetermined diameter or less, but can cut large-diameter steel bars, shaped steel materials such as angle-shaped steel materials or strips, and such shaped steel materials. Part of V
Notches such as notches cannot be molded. Also,
The portable puncher can perform drilling on a relatively thin plate material having a predetermined thickness or less, but cannot perform drilling on a thick plate material having a predetermined thickness or more. Further, since the portable shearing machine of the above-mentioned type is designed to have a structure according to the purpose of use, the user has a shearing machine suitable for various processes such as cutting, punching, notch forming, and bending. I have to prepare. On the other hand, the large machine tool
By exchanging tools and the like, various types of processing can be performed on workpieces of various shapes and sizes. However, since this type of machine tool is expensive and requires a large installation space, it is difficult to install it in a work site such as a construction site or a small factory.

The present invention has been made in view of such circumstances, and an object of the present invention is to cut or punch a large-diameter steel bar or a thick plate material, form a special shape such as a V notch, or the like. It is an object of the present invention to provide a low-cost and lightweight portable machine tool capable of performing various processing such as bending of steel material on a work and having a downsized structure.

[0006]

In order to achieve the above object, the present invention provides a portable shearing machine tool having the following configuration. That is, the portable shearing machine tool of the present invention comprises a machine frame that defines a work area, a drive device supported by the machine frame, and a hydraulic pump device supported by the machine frame and connected to the drive device. A hydraulic cylinder device supported by the machine frame and supplied with hydraulic oil by the hydraulic pump device; a movable tool attached to a piston rod of the hydraulic cylinder device; and a fixing device attached to a predetermined position of the machine frame. With tools. The drive device and the hydraulic pump device are arranged in line on a first axis of the machine frame extending in the vertical direction, and a rotary drive shaft of the drive device rotates about the first axis, and the hydraulic cylinder device. Are aligned on the second axis of the machine frame extending in the vertical direction, and the piston rod moves up and down on the second axis. The movable tool is detachably fixed to the lower end portion of the piston rod in the working area, and moves up and down by expansion and contraction of the piston rod, and the fixed tool cooperates with the movable tool to process a work. Thus, it is detachably fixed to the tool support portion of the machine frame facing the movable tool.

According to the above configuration of the present invention, there is provided an inexpensive shearing machine tool having a simple configuration in which the drive device and the hydraulic pump device, the hydraulic cylinder device and the work area are arranged in parallel. The drive device of the shearing machine tool can be configured by a 100V single-phase AC commutator motor, and the hydraulic pump device is a hydraulic pump device of the type used in the portable shearing machine, that is, a plurality of pumps arranged in a radial pattern. It can be configured by a hydraulic pump device including a unit. Therefore,
The shearing machine tool has a light weight that can be carried by a worker, a degree of freedom in using a power source, and a compact size that can be easily installed on a table or a floor. Moreover, the shearing machine tool is
Despite such a lightweight and compact structure, high output, for example, a shearing force of about 30 tons can be generated, and by appropriately replacing the movable tool and the fixed tool,
It is possible to perform various processing such as cutting or punching of large diameter steel bar or thick plate material, forming of special shape such as V notch, or bending of steel material. Thus, according to the above-mentioned portable shearing machine tool, a machine tool having a novel structure having the advantages of the conventional portable shearing machine and the conventional large-sized machine tool is provided, and its practical effect is extremely large. Preferably, the frame includes a base portion having a tool supporting portion, an intermediate stage arranged above the base portion, and a wall portion arranged between the base portion and the intermediate stage and supporting the intermediate stage. And the working area is defined by the base, the intermediate stage and the wall.

More preferably, the first and second axes are vertically oriented, the tool support has a horizontal tool support surface, and the hydraulic cylinder device is supported by the intermediate stage. The piston rod hangs from the intermediate stage. Further, the hydraulic pump device and the drive device are suspended from an intermediate stage, a rotary drive shaft of the drive device extends vertically upward, and a cam shaft for driving the hydraulic pump device is provided at an upper end portion of the rotary drive shaft. . In a preferred embodiment of the present invention, an oil pressure release device and an oil storage device are arranged in an upper region of the intermediate stage, and the hydraulic pump device and the hydraulic cylinder device are provided with a pressure oil supply pipe line and a pressure oil recirculation line. Interconnected via a conduit. These conduits consist of flexible tubes or include flexible tube sections. The hydraulic pressure release device includes an electromagnetic solenoid valve device. Further, the oil storage device includes a so-called airbag and has an oil storage chamber and an air chamber that communicate with the pressure oil recirculation pipe line. In a further preferred embodiment of the present invention, an expansion head is provided at the lower end of the piston rod, and a locking device having a clutch pin is arranged on the expansion head. The clutch pin holds the base of the movable tool within the lower surface release recess of the expansion head. Further, a piston / stroke adjusting rotary shaft that moves up and down integrally with the expansion head is arranged in parallel with the piston rod.
The rotating shaft has a lead screw, and an elevating member having an indicator needle is screwed to the lead screw. The elevating member moves up and down on the lead screw by the rotation of the rotating shaft, and the indicator needle moves along the scale to indicate the piston stroke of the hydraulic cylinder device. When the elevating member descends by the piston stroke set amount instructed by the indicating needle, the elevating member comes into contact with the elevating / lowering regulating switch arranged at a predetermined position, and the elevating / lowering regulating switch actuates the hydraulic pressure releasing device.

Preferably, the clutch pin is biased inwardly of the recess of the expanding head by the biasing means and projects into the recess, and the base of the movable tool has a locking hole into which the clutch pin is inserted and a locking hole. And an inclined surface arranged above. When inserting the base into the recess, the sloped surface abuts the tip of the clutch pin and displaces the clutch pin outward. The clutch pin aligns with the locking hole when the base is fully inserted into the recess and is inserted into the locking hole to lock the base to the enlarged head.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a portable shearing machine tool according to the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 are a perspective view and a side view of a portable shearing machine tool according to an embodiment of the present invention. A portable shearing machine tool 1 (hereinafter referred to as a machine tool 1) includes a frame body or a machine frame 2, and the machine frame 2 includes a carrying handle 21 that a user holds with a finger, a tabletop or a floor surface, and the like. The base 22 is supported by the support surface of the base 22 and the intermediate stage 23 arranged above the base 22. The intermediate stage 23 is supported by the wall body 24. The base 22 is provided with a plurality of brackets or legs 26 that can be fixed on the support surface with locking tools such as bolts or fasteners. The legs 26 are respectively arranged at the corners of the base 22, and the lower surfaces of the legs 26 are located on the same horizontal plane, and the first abutment plane of the machine frame 2 that comes into contact with the support surface is the same. Form. A plurality of second leg portions 27 are arranged on the rear surface or the rear surface of the machine casing 2. The pair of second leg portions 27 are symmetrically arranged on the rear surface of the lower end portion of the base 22, and the pair of second leg portions 27 are provided.
, But protrudes rearward from the rear surface of the intermediate stage 23. Second
The tip surfaces of the legs 27 are located on the same vertical plane and form the second contact plane of the machine casing 2. The tip surface of each leg 27 is
When the machine tool 1 is tilted backward by an angle of 90 degrees, it comes into contact with the support surface.

Between the base 22 and the intermediate stage 23,
A work area that is open to the side and front is formed, and the work area is defined by the tool support portion 25 on the base 22, the intermediate stage 23 of the machine frame 2 and the wall 24. In each drawing, the machine tool 1 is arranged in a general vertical use position,
The work area is open to the front. The machine tool 1 is normally used in this vertical position. However, in certain applications or conditions, the machine tool 1
It is used in a horizontal use position tilted backward by an angle of 90 degrees, and in this horizontal use position, the work area opens upward. For example, when the machine tool 1 is used as a bending machine or a bender and the central portion of a workpiece having an extremely long overall length is bent, both ends of the workpiece can be displaced upward to contact or collide with a ceiling or the like. There is a nature. In such a case, the machine tool 1 is arranged so that both ends of the workpiece are horizontally displaced.
Used in horizontal use position. The machine tool 1 shown in FIGS. 1 and 2 is mainly used as a cutter or a shearing machine for cutting a steel material.
A movable blade assembly 10 and a fixed blade assembly 11 are arranged.
The movable blade assembly 10 is moved up and down within the work area, and the fixed blade assembly 11 is fixed to the horizontal upper surface of the tool support 25.
The machine tool 1 of this example has a depth of about 40 to 45 cm and a total height of about 65 to 70 cm.
Is about 100 to 110 kg (the main body weight excluding the movable blade assembly 10 and the fixed blade assembly 11 is about 90 k).
g) It is set to about.

The machine tool 1 is provided with a pair of vertical axis lines X-X and Y-Y which are horizontally separated from each other. Vertical axis XX
An electric motor 3 that constitutes a drive source and a pump unit 4 that is connected to the output shaft of the electric motor 3 are arranged on the upper side, and a hydraulic cylinder device 5 is arranged on the vertical axis YY.
The hydraulic cylinder device 5 cooperates with the pump portion 4 to form a hydraulic operating mechanism of the machine tool 1. The hydraulic pressure release device 6 including the electromagnetic solenoid 60 is arranged in the upper region of the intermediate stage 23 between the vertical axes XX and YY. An oil storage device 7 having a so-called airbag is arranged above the pump unit 4. Also, the locking device 8 is arranged in the work area. The locking device 8 is for removably locking or fixing the movable blade assembly 10 to the reciprocating member (piston rod) of the hydraulic cylinder device 5. Further, an elevating / lowering restricting device 9 for restricting an elevating / lowering stroke of the movable blade assembly 10 is arranged at the front edge of the intermediate stage 23. 3 and 4
FIG. 3 is a partial vertical sectional view of the machine tool 1 shown in FIGS. 1 and 2. The pump unit 4 is supported on the lower surface of the intermediate stage 23, and the electric motor 3 is connected to the lower end of the pump unit 4,
The pump unit 4 and the electric motor 3 are suspended from the intermediate stage 23.

The electric motor 3 has a vertical rotary drive shaft, that is, an output shaft 30, which is arranged concentrically with the vertical axis X-X, and the output shaft 30 extends upward and extends into the pump portion 4. . The output shaft 30 is rotatably supported by bearings in the pump unit 4. At the upper end of the output shaft 30, the cam shaft 3
1 is formed. The central axis of the camshaft 31 is the vertical axis X.
-X, that is, eccentric by a predetermined horizontal distance with respect to the rotation axis of the output shaft 30. A needle bearing 32 is arranged on the outer periphery of the cam shaft 31 concentrically with the cam shaft 31. The housing 40 of the pump unit 4 is connected to the upper end of the electric motor 3, and the oil tank 42 containing the hydraulic oil is
It is formed within the pump housing 40. The oil tank 42 communicates with a supply port (not shown) having a plug screwed therein, and hydraulic oil is supplied to the oil tank 42 via the supply port as required. The pump unit 4 has a plurality of pump units 4a,
Each pump unit 4a is radially arranged around the vertical axis XX. In this example, four sets of pump units 4a arranged on the same horizontal plane are arranged around the cam shaft 31 with an angular interval of 90 degrees. Each pump unit 4a is provided with a pump piston or pump plunger 41 which is in sliding contact with the outer peripheral surface of the needle bearing 32. The plunger 41 is constantly urged by the spring 44 toward the center, that is, toward the needle bearing 32. An oil passage 43 communicating with the oil tank 42 is arranged adjacent to the outer end portion of the plunger 41, and an opening / closing valve 45 composed of a check valve is arranged at the upstream end portion of the hydraulic oil supply passage 47. The on-off valve 45 is urged toward the plunger 41 by the spring 46, and is normally in the feeding path 4
7 is closed. The feeding path 47 extends upward from the on-off valve 45, penetrates the intermediate stage 23, is connected to the flexible tube 48, and communicates with the hydraulic cylinder device 5 via the flexible tube 48. Further, the feeding path 47 has a branch path 49, and the branch path 4
9 communicates with a pressure regulating valve or a pressure regulating valve (not shown) that functions as a safety valve.

The hydraulic cylinder device 5 includes upper and lower cylinder cases 50 and 55, a piston 51 reciprocally arranged in the cylinder case 50, and upper and lower hydraulic chambers defined on both sides of the piston 51, respectively. 52 and 53 are provided. In the lower hydraulic chamber 53, a return spring 57 for urging the piston 51 upward and a piston 51
And a piston rod 56 that extends downwardly from.
The return spring 57 always holds the piston 51 at the uppermost position, that is, at the most retracted initial position. The upper hydraulic chamber 52 is provided with a feed passage 47 via a flexible tube 48.
And the release valve device 61 of the hydraulic pressure release device 6 via the hydraulic pressure release passage 54. The hydraulic pressure release passage 54 is used when the release valve 61 is opened.
5 communicating with the lower hydraulic chamber 53 and also communicating with the oil tank 42 via the release oil passage 66, whereby the hydraulic oil in the upper hydraulic chamber 52 is transferred to the lower hydraulic chamber 53 and returned to the oil tank 42. Let The release valve device 61 of the hydraulic release device 6 includes a spool valve 62 capable of closing the hydraulic release passage 54.
The spool valve 62 is connected to the vertical drive shaft 64 of the electromagnetic solenoid 60. The spool valve 62 is normally
It is biased upward by the compression coil spring 63. The electromagnetic solenoid 60 is connected to a control device attached to the machine casing 2 and selectively excited or demagnetized. The electromagnetic solenoid 60 keeps the spool valve 6 in a non-energized state (when demagnetized).
2, the hydraulic pressure release passage 54 is communicated with the bypass oil passage 65 and the release oil passage 66. On the other hand, at the time of energization (during excitation), the drive shaft 64 is lowered against the coil spring 63 to cause the spool valve 62 to move. To close the hydraulic pressure release passage 54.

The oil storage device 7 includes a hydraulic chamber 52 and a hydraulic chamber 53.
Of the release valve device 61 and the oil tank 42 via the oil passage 66. The oil storage chamber 71 that communicates with the oil storage chamber 7, a flexible film 72 generally called an airbag, and the oil storage chamber 7 formed by the flexible film 72.
The air chamber 73 is isolated from the air conditioner 1. Air chamber 7
3 is open to the atmosphere by an upper vent hole 74.
A pipe material made of a flexible material, for example, a rubber pipe 67 is inserted between the hydraulic pressure release device 6 and the oil storage device 7. The rubber tube 67 and the flexible tube 48 allow relative displacement between a member or portion on the vertical axis XX and a member or portion on the vertical axis Y-Y, or a mounting error of these members or portions. To compensate. The piston rod 56 of the hydraulic cylinder device 5 is arranged concentrically with the vertical axis Y-Y and extends downward through the lower hydraulic chamber 53 and the lower casing 55. The expansion head 58 is fixed to the lower end of the piston rod 56, and the base 17 of the movable blade assembly 10 is attached to the lower surface of the expansion head 58.
Is formed with a lower surface opening recessed portion 58a into which is inserted.

The clutch pin 80 of the locking device 8 has a recess 58.
project into a. The locking device 8 includes a holder 82 fixed to the expansion head 58 and a compression spring 83 arranged in the holder 82. The holder 82 supports the clutch pin 80 so as to be horizontally movable, and the compression spring 83
The clutch pin 80 is biased inward so that the clutch pin 80 projects into the recess 58a. Clutch pin 8 with fingers
When the head portion 81 of 0 is pulled outward, the clutch pin 80
Of the expansion head 5 against the compression spring 83.
Pull it into the wall of No. 8. When the head portion 81 is released, the clutch pin 80 is displaced inward by the repulsive force of the compression spring 83, and the tip end portion of the clutch pin 80 is recessed 58a.
Project inside. The clutch pin 80 is used for the movable blade assembly 10.
It is inserted into the locking hole 19 formed in the base portion 17 of the. The base 17 includes an inclined surface 18 above the locking hole 19. When the base 17 is inserted into the recess 58a, the inclined surface 18 abuts against the tip of the clutch pin 80 and displaces the clutch pin 80 outward against the compression spring 83. Base 1
7 is completely inserted into the recess 58a, the clutch pin 8
0 is aligned with the locking hole 19, and the tip of the clutch pin 80 is locked by the repulsive force of the compression spring 83.
It is inserted therein and locks the base 17 to the expansion head 58.
With such a structure, the movable blade assembly 10 can be replaced with a movable tool of another structure or type in a one-touch manner.

As shown in FIGS. 2 and 4, the movable blade assembly 1
Reference numeral 0 includes a tool holder 15 integrally connected to the lower end of the base 17, and a movable blade 10a connected to the tool holder 15 via a support shaft 16. The movable blade 10a has a vertical axis Y.
-Cutting blade 1 that extends symmetrically diagonally upward from the tip on Y
0b and faces the fixed blade assembly 11. As shown in FIG. 1, the fixed blade assembly 11 includes a pair of parallel fixed blades 12, and a slit 13 capable of accommodating the movable blade 10 a is formed between the fixed blades 12. The slit 13 has substantially the same width as the movable blade 10a. Each fixed blade 12 is vertically fixed to the substrate 14, and the substrate 12 is detachably fixed to the horizontal upper surface of the tool supporting portion 25. Referring to FIG. 2 and FIG. 4, each fixed blade 12 has a cutting blade 12a extending obliquely upward and symmetrically from the bottom end on the vertical axis YY, and the left and right cutting blades 12a are, for example, bottom ends. With 90 degree angle intervals. The work or the steel material W is placed on the fixed blade 12. 2 and 4, L-75 × 75 × 6 (mm)
The angle-shaped steel material is illustrated as the work W. When the movable blade assembly 10 descends due to the extension of the piston rod 56, the fixed blade 12 cooperates with the movable blade 10a,
Work W inserted between the movable blade 10a and the fixed blade 12
And the work W is cut vertically.

The enlarged head 58 of the piston rod 56 is
A horizontal connecting rod 59 is provided. The horizontal connecting rod 59 is operatively connected to the up-and-down regulating device 9 for regulating the up-and-down stroke of the piston 51 (piston rod 56). That is,
One end of the horizontal connecting rod 59 is integrally connected to the enlargement head 58, and the other end thereof is connected to the rotating shaft 90 of the up-and-down regulating device 9 so as to be relatively rotatable. An enlarged head 94 provided with a knurl is integrally attached to the lower end of the rotary shaft 90. The stoppers 95 are arranged above the enlarged head portion 94 with a predetermined space therebetween, and the horizontal connecting rod 59 is held between the enlarged head portion 94 and the stopper 95. The rotating shaft 90 penetrates the bearing hole of the intermediate stage 23 and extends vertically upward. A lead screw 91 is formed on the rotating shaft 90. The elevating member 92 forming the LS dog is screwed into the lead screw 91, and the projection 93 protruding laterally is attached to the outer surface of the elevating member 92 by a screw or the like. The protrusion 93 is a scale plate 9.
6 through the slot 97, is guided in the vertical direction by the slot 97, engages with the edge portion of the slot 97, and is prohibited from rotating around the rotary shaft 90. The scale plate 96 has an L-shaped cross section as a whole, an upper end thereof is fixed to the cylinder case 50, and a lower end thereof is fixed to the intermediate stage 23. As shown in FIG. 1, scales 99 are provided on the side surfaces of the scale plate 96, and the scales 99 are arranged along the edges of the slots 97 extending in the vertical direction. Protrusion 9
An indicator needle 98 provided at the outer end of 3 moves up and down along the scale 99 to indicate the height position of the elevating member 92.

As shown in FIG. 4, a lower limit setting limit switch LS is arranged below the elevating member 92, and the detector of the limit switch LS is positioned at a position where it can contact the lower inclined surface of the elevating member 92. . Limit switch LS
Is attached to the intermediate stage 23 or the cylinder case 50 so that its height can be adjusted, and is electrically connected to the electromagnetic solenoid 60 via a control device (not shown) of the machine tool 1. When the LS dog 92 comes into contact with the detector of the limit switch LS (when the limit switch LS is turned ON), the electromagnetic solenoid 60 is demagnetized for a predetermined time to release the hydraulic pressure release path 54, while the LS dog 92 is released. When it is separated from the detector of the limit switch LS (when the limit switch LS is turned off), the electromagnetic solenoid 60
Are excited (energized) to close the hydraulic pressure release passage 54. The rotary shaft 90 rotates integrally with the enlarged head 94. The lifting member 92 engaged with the slot 97 moves up and down on the lead screw 91 by the rotation of the rotating shaft 90. Scale 99
(FIG. 1) indicates the height of the lifting member 92, more specifically, the vertical distance from the detector of the limit switch LS to the lifting member 92. This vertical distance corresponds to the lift stroke setting amount of the piston 51 (piston rod 56).
Therefore, the enlarged head 94 is provided with the scale 9 indicated by the indicating needle 98.
The finger 9 is rotated so that the numerical value on 9 corresponds to the desired lift stroke setting amount, whereby the lift stroke of the piston 51 is adjusted.

Next, the operation of the shearing machine 1 will be described. The machine tool 1 is started by turning on the operation switch or the remote control switch of the control device attached to the machine casing 2. The electric motor 3 is operated and the output shaft 30 and the cam shaft 31 are rotated. Also, the electromagnetic solenoid 60
Are excited (energized) to close the hydraulic pressure release passage 54. The needle bearing 32 located on the outer periphery of the cam shaft 31 is
Due to the eccentric rotation of the cam shaft 31, the cam shaft 31 is periodically displaced in the radial direction,
Plunger 4 slidingly contacting the outer circumference of needle bearing 32
1 reciprocates. The plunger 41 sucks the hydraulic oil in the oil tank 42 in the suction step of moving toward the center of the pump unit 4. The open / close valve 45 is closed in the suction process. On the other hand, the plunger 41 pressurizes the sucked hydraulic oil in the discharge step of moving outward in the radial direction of the pump unit 4, opens the on-off valve 45 against the spring 46, and transfers the hydraulic oil to the feed passage 47. Send by pressure. The hydraulic oil pressure-fed to the feeding path 47 is fed to the hydraulic cylinder device 5 via the flexible tube 48. Each pump unit 4a operates at an angle of 90 degrees and repeats the suction process and the discharge process, and the pump unit 4 supplies the hydraulic oil of the predetermined pressure to the hydraulic chamber 52 of the hydraulic cylinder device 5. Then, the hydraulic pressure in the upper hydraulic chamber 52 of the hydraulic cylinder device 5 is increased.

The piston 51 descends against the elastic force of the return spring 57 due to the pressure increase in the upper hydraulic chamber 52. As a result, the piston rod 58 and the movable blade assembly 10 descend, and the movable blade 10a cooperates with the fixed blade assembly 11 to shear (cut) the work W. Rotating shaft 90
Descend with the piston rod 58. Piston 5
When 1 descends by a predetermined lifting stroke, the rotating shaft 90
The upper LS dog 92 contacts the detector of the limit switch LS. The electromagnetic solenoid 60 is demagnetized for a predetermined time,
The coil spring 63 pulls up the spool valve 62. As a result, the hydraulic chamber 52 communicates with the oil tank 42 via the hydraulic pressure release passage 54 and the release oil passage 66, and
The hydraulic oil in the hydraulic chamber 52 communicates with the lower hydraulic chamber 53 via the hydraulic pressure release passage 54 and the bypass hydraulic passage 65, and the working oil flows back or flows into the oil tank 42 and the lower hydraulic chamber 53. Thus, the pressure oil in the upper hydraulic chamber 52 is released, which results in the piston 51
Is raised by the return spring 57 to the initial position shown in FIG. Thus, the piston rod 56 is retracted into the hydraulic cylinder device 5, the movable blade assembly 10 returns to the initial position, and is separated from the fixed blade assembly 11.

In the above embodiment, the movable blade assembly 10 is used.
Although the fixed blade assembly 11 is attached to the machine tool 1, a punch or a punch assembly, a tool for bending, a tool for forming a special shape such as a V notch, and a tool for cutting a screw bolt, etc. The tool can be replaced with the movable blade assembly 10 and the fixed blade assembly 11 to be mounted on the machine tool 1. Further, in the above embodiment, the pump unit 4 is
Pump units 4 arranged radially on the same horizontal plane
As another configuration, a crankshaft eccentrically offset in opposite directions is provided at the upper end of the output shaft 30, and the crankshaft is connected in series in the vertical axis XX direction and is opposite to the above. A pair of upper and lower eccentric cam portions that are eccentric to the side may be formed. In this case, a pair of upper and lower pump units are provided, and each pump unit is provided with a reciprocating plunger facing the eccentric cam portion, and a biasing means for biasing the plunger toward the cam portion. It reciprocates in synchronization with the rotation of the eccentric cam portion, and repeats the discharge process and the suction process. In the eccentric cam portion, the discharge process of the lower pump unit and the suction process of the upper pump unit occur substantially at the same time, and the suction process of the lower pump unit and the discharge process of the upper pump unit substantially occur. It is arranged at a predetermined angular position around the crankshaft so as to occur simultaneously. Preferably, the ridges of the eccentric cam portion are arranged at positions separated by a phase of 180 degrees around the rotation center axis of the rotary drive shaft, the needle bearings are arranged on the outer periphery of the eccentric cam portion, and the pump unit is , Arranged in parallel vertically on the side of the crankshaft.

[0023]

As described above, according to the present invention,
Various types of processing such as cutting or punching of large diameter steel bars and thick plate materials, forming of special shapes such as V notches, bending of steel materials, etc. can be applied to the work, and a compact construction A low-cost and lightweight portable machine tool is provided. The portable shearing machine tool of the present invention is a machine tool having a novel configuration that has the advantages of both the conventional portable shearing machine and the conventional large-sized machine tool, and its practical effect is extremely large.

[Brief description of drawings]

FIG. 1 is a perspective view of a machine tool according to an embodiment of the present invention.

FIG. 2 is a side view of the machine tool shown in FIG.

FIG. 3 is a partial vertical cross-sectional view of the machine tool shown in FIGS. 1 and 2.

FIG. 4 is a partial vertical cross-sectional view of the machine tool shown in FIGS. 1 and 2.

[Explanation of symbols]

 1 Portable Shearing Machine Tool 2 Machine Frame 3 Electric Motor 4 Pump Section 4a Pump Unit 5 Hydraulic Cylinder Device 6 Hydraulic Release Device 7 Oil Storage Device 8 Locking Device 9 Lifting Regulator 10 Movable Blade Assembly 11 Fixed Blade Assembly 21 Transport Handle 22 Base 23 Intermediate stage 24 Wall 25 Tool support 30 Output shaft 31 Cam shaft 40 Housing 41 Pump plunger 42 Oil layer 48 Flexible tube 50, 55 Cylinder case 51 Piston 52, 53 Hydraulic chamber 54 Pressure oil release path 56 Piston rod 57 Return spring 58 Enlargement head 60 Electromagnetic solenoid 61 Release valve device 65 Bypass oil passage 66 Release oil passage 80 Clutch pin 90 Rotating shaft 91 Lead screw 92 Elevating member (LS dog) 93 Protrusion 96 Scale plate 97 Slot 98 Indicator needle 99 Scale LS limit Switch X-X, Y-Y vertical axis

Claims (1)

[Claims] 1. A machine frame defining a work area, a drive device supported by the machine frame, a hydraulic pump device supported by the machine frame and connected to the drive device, and supported by the machine frame. A hydraulic cylinder device that supplies and discharges hydraulic oil by the hydraulic pump device, a movable tool that is attached to a piston rod of the hydraulic cylinder device, and a fixed tool that is attached to a predetermined position of the machine frame, The drive device and the hydraulic pump device are arranged in alignment on a first axis of the machine frame extending in the vertical direction, a rotary drive shaft of the drive device rotates about the first axis, and the hydraulic cylinder device is , Aligned on a second axis of the machine frame extending in the vertical direction, the piston rod moves up and down on the second axis, and the movable tool is at a lower end portion of the piston rod in the working area. Removable Is fixed to the tool support part of the machine frame facing the movable tool so that the fixed tool cooperates with the movable tool to process a work, and is lifted up and down by expansion and contraction of the piston rod. A portable shearing machine tool characterized by being fixed to.