JP2502444Y2 - Hydraulic processing equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic machining device, and more particularly to a technique for improving workability in machining.

[0002]

2. Description of the Related Art When a piston of a hydraulic cylinder is linearly driven by hydraulic pressure, cutting, crimping and compression are performed between a movable tool provided on the piston and a fixed tool provided on the cylinder body of the hydraulic cylinder. A hydraulic processing device that performs processing such as bending is known. There are two types: a handy type, in which the operator holds the hydraulic cylinder by hand, and a stationary type, in which the hydraulic cylinder is fixed in position. Some are integrally equipped with a pump, and some are connected to a hydraulic pump via a connection hose. Ma
In addition, the cylinder body generally allows the piston to slide.
Cylinder tube that fits well and the fixed tool is provided
It is configured with a cylinder cap that is
Between those cylinder tubes and cylinder caps
Requires a large number of bolts because a large force is applied during processing.
Either integrally connected using, or one of them
Of the external thread on the outer peripheral surface of the
It is connected integrally by being screwed with a female screw
It is normal that Japanese Utility Model Publication No. 60-21126
And the device described in JP-A-2-104498
Is an example of such a hydraulic processing device.

[0003]

[Problems to be solved by the device] However, the above problem
Linda tube and cylinder cap cannot rotate relative to each other
Since it is used in a state where it is connected to the machine, it is not possible to change the posture of the fixed tool or movable tool in the stationary hydraulic machining device, and the posture of the work that can be machined is limited, while the handheld hydraulic machining device is used. In the above, the entire hydraulic cylinder can be rotated around its axis to machine workpieces in various postures, but the workability at the time of machining, such as having to twist the hand holding the hydraulic cylinder, I was not always completely satisfied.
For example, when cutting rebar at a construction site, etc., a handy type bar cutter is preferably used. However, although the direction and cutting angle of the rebar are different, the bar cutter gripped by the hand is used. Since it is necessary to twist the hand or body to adjust the posture of the bar cutter to the direction of the reinforcing bar, the workability is particularly poor in a narrow space.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to easily change the postures of a fixed tool and a movable tool.

[0005]

In order to achieve the above object, the first invention is that a piston of a hydraulic cylinder is linearly driven by hydraulic pressure, so that a movable tool provided on the piston and the hydraulic pressure. In a hydraulic processing device that performs processing with a fixed tool provided on a cylinder body of a cylinder, (a) the cylinder body is provided with a cylinder tube into which the piston is slidably fitted and the fixed tool. those having a cylinder cap, the cylinder tube and the cylinder cap, depending on that the internal thread provided on the external thread and the other of the inner peripheral surface provided on one outer peripheral surface of it, such as screwed communication On the other hand, (b) provided on both the cylinder tube and the cylinder cap, the cylinder tube and the cylinder cap While it allowed to rotate relative to only about the axis 1 rotates less than a predetermined angle along the screwing of the male screw and the female screw, circumferential exceeds the predetermined angle
In the above, there is provided stopper means which are engaged with each other and prevent further relative rotation.

[0006]

In the hydraulic processing apparatus as described above, the cylinder tube and the cylinder cap have a male screw provided on one outer peripheral surface thereof and a female screw provided on the other inner peripheral surface thereof. depending on the be screwed
Together are consolidated, since it is allowed to relatively rotate around the axis along the screwing of one rotation is smaller than a predetermined angle the external thread and the internal thread defined by the stopper means, turning the cylinder cap The posture of the fixed tool can be easily changed by. In that case, if it is necessary to hold the fixed tool and the movable tool in a constant relative posture like a bar cutter, if the movable tool can be integrally rotated with the rotation of the fixed tool, Well, when it is not necessary to hold the movable tool in a fixed relative posture with respect to the fixed tool such as when the movable tool has a cylindrical shape, it is possible to rotate only the fixed tool. Since the posture of the fixed tool can be easily changed in this way, in the stationary hydraulic machining device, by changing the posture of the fixed tool according to the posture of the work, machining can be performed on works of various postures. On the other hand, in the handy type hydraulic machining device, by changing the posture of the fixed tool according to the posture of the work, the operator can perform various operations without twisting his or her hand or body. It becomes possible to process the work in this posture, improving workability especially in narrow spaces. Since the stopper means prevents relative rotation of a predetermined angle smaller than one rotation, there is no risk that the male screw and the female screw will be unthreaded and will be separated from each other.

[0007]

[Second Means for Solving the Problems] The second invention is hydraulic
The piston of the cylinder is driven linearly by hydraulic pressure.
The movable tool installed on the piston and the hydraulic pressure
Between the fixed tool provided on the cylinder body of the cylinder
In a hydraulic processing device for processing, (a) the cylinder
The body is a cylinder into which the piston is slidably fitted.
Cylinder cap with tube and fixing tool
With a cylinder tube and syrin
The da cap is movable in the axial direction and relative to the axis.
While it is rotatably fitted, (b) its cylinder
The mating part of the tube and cylinder cap is
Each of the annular grooves is formed so as to form an annular passage in
And the wire is inserted through the annular passage.
The cylinder tube and cylinder cap
Connected in such a way that they cannot be disengaged in any direction
It is characterized by

[0008]

[Operation and effect of second invention] Such a hydraulic processing device
In, cylinder tube and cylinder cap
Enables relative movement in the axial direction and relative rotation around the axis
Both rings that are fitted and are provided in the fitting part
The wire is inserted through the annular passage formed by the groove
The cylinder tube and cylinder key
Cap cannot be detached in the axial direction and can rotate relative to the shaft
Since it is said that turning the cylinder cap
The posture of the fixed tool can be changed more easily. I
Therefore, also in this case, the same effect as the first invention is obtained.
Is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a view showing the overall structure of a handy type bar cutter 10 to which the present invention is applied. The grip portion 12 and the switch 1 provided on the grip portion 12 are shown.
4 is a pump drive electric motor 16 that is turned on only while the push-in operation is performed, a first housing 20 in which a gear mechanism that transmits the rotational force of the electric motor 16 is housed, and a tank 18 is attached; A second housing 22 containing a pump and valves, and a hydraulic cylinder 24
And a cutting jig 26 are integrally provided. The bar cutter 10 is an example of a hydraulic processing device.

In the first housing 20 and the second housing 22, the rotation of the output shaft 28 of the electric motor 16 is rotated by the gears 30, as shown in FIG.
A rotary shaft 34 transmitted via 32 is rotatably held, and a pump chamber 36 is provided in a direction orthogonal to the rotary shaft 34 so that a plunger 4 of a hydraulic pump 38 is provided.
0 is fitted so as to be movable in the axial direction. Plunger 4
0 is always rotated by the compression coil spring 44 inserted between the plug 42 forming the pump chamber 36 and the rotary shaft 3
The eccentric cam 46 provided on the rotating shaft 34 is urged to the 4 side and abuts against the eccentric cam 46 via a needle bearing 48. When the rotating shaft 34 is rotationally driven by the electric motor 16, it reciprocates in the axial direction. Pump room 3 moved
Increase or decrease the volume of 6. The pump chamber 36 allows the inflow of hydraulic oil into the pump chamber 36, but flows out, as is apparent from FIG. 4 showing the cross section of the second housing 22 and FIG. 5 showing the VV cross section of FIG. Is communicated with the intake oil passage 52 through a check valve 50 that blocks the discharge oil passage 56 through a check valve 54 that allows the hydraulic oil to flow out of the pump chamber 36 but blocks the inflow. Is in communication with
The hydraulic oil is sucked from the suction oil passage 52 and discharged to the discharge oil passage 56 as the volume of the plunger 40 increases and decreases due to the reciprocating movement of the plunger 40.

The suction oil passage 52 is opened to an oil storage chamber 58 shown in FIG. 3, and the oil storage chamber 58 is connected to the tank 18 via an oil passage 60.
The tank 18 has a bottomed cylindrical metal housing 62 whose opening is screwed into the first housing 20, and is accommodated in the housing 62 and the opening is fixed to the inner wall surface of the housing 62 by a seal ring 64. And a bottomed cylindrical rubber tank 66. The oil storage chamber 58 is communicated with the rubber tank 66. The rubber tank 66 is filled with hydraulic oil, and is expanded and contracted according to the amount of the oil. The housing 62 has a ventilation hole 68 for communicating the inside with the atmosphere.

On the other hand, the discharge oil passage 56 is shown in FIG.
It is communicated with the valve chamber 72 of the switching valve 70 shown in FIG. 6 which is a VI-VI cross section. The valve chamber 72 is
The opening of a bottomed circular hole formed in the second housing 22 is closed by a plug 74, and the discharge oil passage 56 is opened at the lower end of the valve chamber 72, that is, the end on the plug 74 side. . A main valve body 76 is fitted in the valve chamber 72 so as to be slidable in the axial direction. The main valve body 76 is constantly urged toward the plug 74 by a compression coil spring 78. A circular hole 80 having a bottom is formed in the main valve body 76 from the end portion on the plug 74 side. The circular hole 80 is fitted to the protruding shaft 82 provided at the tip portion of the plug 74, and at the bottom portion of the circular hole 80. Is formed with a small circular hole, and a needle valve type auxiliary valve body 84 is disposed so as to be movable in the axial direction. The auxiliary valve body 84 is always urged by a compression coil spring 86 inserted between the auxiliary valve body 82 and the plug 74 in a direction opposite to the plug 74, that is, in a direction to protrude from the main valve body 76. The protrusion provided on the bottom of the circular hole 80 is prevented from projecting by a predetermined amount or more. The spring force of the compression coil spring 86 is sufficiently weaker than that of the compression coil spring 78, and the main valve body 76 is actuated via the auxiliary valve body 84.
6 is always moved to the plug 74 side against the urging force of No. 6 and is fitted to the protruding shaft 82. An oil supply / discharge passage 8 communicating with the hydraulic cylinder 24 is provided at an intermediate portion of the valve chamber 72.
8 is opened, and a discharge oil passage 90 communicating with the oil storage chamber 58 is opened at an end opposite to the plug 74, and a plurality of passages are formed in a cylindrical portion of the main valve body 76. An oil hole 92 is provided. The sub-valve 84 is provided with a plug 7
4 is moved in the opposite direction to the discharge oil passage 90.
, And closes the discharge oil passage 90. In addition, FIG.
It is a figure corresponding to a IV cross section.

The switching valve 70 thus constructed is
When the hydraulic pump 38 is operated by the electric motor 16 and hydraulic oil is supplied from the discharge oil passage 56 into the valve chamber 72, the hydraulic pressure causes the main valve body 76 to resist the urging force of the compression coil spring 78. It is moved in a direction away from the plug 74, and as shown in FIG.
4 closes the opening of the discharge oil passage 90 in accordance with the urging force of the compression coil spring 86, and moves the main valve body 76 to a position where the protruding shaft 82 relatively comes out of the circular hole 80. Crevice with circular hole 80 and oil passage hole 9
The discharge oil passage 56 is communicated with the supply / discharge oil passage 88 via the second passage 2. As a result, the hydraulic oil pumped from the hydraulic pump 38 is supplied to the hydraulic cylinder 24. When the electric motor 16 is stopped and hydraulic oil is no longer supplied from the hydraulic pump 38, the main valve body 76 is moved toward the plug 74 according to the urging force of the compression coil spring 78, and is shown in FIG. As described above, the protruding shaft 82 is relatively fitted into the circular hole 80 of the main valve body 76, and the sub-valve body 84 resists the urging force of the compression coil spring 86 with the movement of the main valve body 76. Then, it is separated from the opening of the discharge oil passage 90, and the discharge oil passage 90 and the supply / discharge oil passage 88 are communicated. This allows the working oil in the hydraulic cylinder 24 to return to the oil storage chamber 58 and further to the tank 18 via the supply / discharge oil passage 88 and the discharge oil passage 90. In addition, circular hole 8
A predetermined gap is provided between the inner peripheral surface of the shaft 0 and the outer peripheral surface of the protruding shaft 82, and the main valve body 76 can be returned to a position where the main valve body 76 abuts on the plug 74 by flowing hydraulic oil through the clearance. It has become.

A relief valve 94 is provided in the second housing 22 and is connected to the oil supply / discharge oil passage 88 via a branch oil passage 96. This relief valve 94
Is provided with a relief valve 100 which always closes the opening of the branch oil passage 96 by a compression coil spring 98. When the oil pressure in the supply / discharge oil passage 88 becomes higher than necessary, the relief valve 100 is provided. Is pushed back against the urging force of the compression coil spring 98, thereby opening the opening of the branch oil passage 96 and discharging the hydraulic oil in the supply / discharge oil passage 88 to the discharge oil passage 102.
From the oil storage chamber 58.

On the other hand, the hydraulic cylinder 24 and the cutting jig 26 are shown in FIG. 1 which is a front view thereof, FIG. 8 which is a plan view thereof, and FIG. 9 which is a sectional view taken along line IX-IX and XX in FIG.
As shown in detail in FIG. 10, the hydraulic cylinder 24 has three
A cylinder tube 112 fixed to the end surface of the second housing 22 by a plurality of bolts 110, a cylinder cap portion 116 integrally provided on the body frame 114 of the cutting jig 26, and a cylinder tube 112 that slides into the cylinder tube 112. And a piston 118 that can be fitted therein. The cylinder tube 112 has a bottomed cylindrical shape, is fixed to the second housing 22 on the bottom portion 120 side, and the bottom portion 120 has an additional member formed between the piston 118 and the bottom portion 120. A communication hole 124 for communicating the pressure chamber 122 with the oil supply / discharge passage 88 is provided.
A female screw 125 is provided on the cylinder cap portion 116 and is screwed with a male screw 127 provided on the outer peripheral surface of the cylinder tube 112. The tip end of the cylinder tube 112 is made thin with the external thread 127 portion on the outer peripheral side left, and the engagement pin 180 is driven into the end surface of the stepped portion to be fixed, while the cylinder cap portion 116 has a screw hole. 182 is provided, and in a state where the cylinder tube 112 and the cylinder cap portion 116 are screwed together, a hexagon socket screw 186 having an engaging protrusion 184 at the tip is screwed into the screw hole 182, The engagement of the engagement protrusion 184 and the engagement pin 180 in the circumferential direction prevents the cylinder cap portion 116 from slipping out, and the engagement pin 184 and the engagement pin 180 are prevented from falling out.
0 ° , strictly speaking, the engagement protrusion 184 and the engagement pin 180
Relative rotation is possible within an angle range smaller than 360 ° by the diameter dimension . The screw 186 is designed to be completely screwed into the screw hole 182.
82, the lock screw 188 is screwed in later and the screw 18
The screw 186 is non-rotatably fixed to the cylinder cap 116 by being pressed by the rear end of the screw 6. The internal thread 125, the external thread 127, the engaging pin 180, the screw 186 including the engaging projection 184, and the like are used to connect the cylinder tube 112 and the cylinder cap portion 116 such that they cannot be separated in the axial direction and are rotatable relative to each other about the axis. Connecting means 19
0 is configured. The cylinder cap portion 116 of the main body frame 114 corresponds to a cylinder cap, the cylinder cap portion 116 and the cylinder tube 112 form a cylinder body of the hydraulic cylinder 24, and the engagement pin 180 and the screw 186 correspond to stopper means. . Note that the engagement pin 180 may be directly provided upright on the tip surface of the cylinder tube 112 without thinning the tip portion of the cylinder tube 112. Further, FIG. 2 shows a state in which the main body frame 114 is rotated so as to cut a metal bar material 128 such as a reinforcing bar which is long in the vertical direction in the figure, and FIGS. The frame 114 is in a state of being rotated 90 ° around the axis of the cylinder tube 112.

The cylinder cap portion 116 has an insertion hole 13
2, a piston rod 134 integrally formed with the piston 118 is slidably inserted, and a scraper 136 is attached to the insertion hole 132. An O-ring 138 is attached to the piston 118, and an oil-tight seal is provided between the piston 118 and the inner peripheral surface of the cylinder tube 112. 8 and the direction in which the piston rod 134 is projected, while the hydraulic pump 38 is moved.
Is stopped and the hydraulic pressure of the hydraulic oil is reduced, the piston 118 communicates with the hydraulic oil in the pressurizing chamber 122 in accordance with the urging force of the compression coil spring 140 inserted between the piston 118 and the cylinder cap portion 116. It is moved toward the bottom portion 120 side while being pushed out from 124. When the hydraulic pump 38 stops, the switching valve 70 is switched to connect the oil supply / exhaust oil passage 88 and the oil discharge passage 90, so that the hydraulic oil in the pressurizing chamber 122 can be pushed out. The space between the piston 118 and the cylinder cap portion 116 is in communication with the atmosphere via a vent hole (not shown) provided in the cylinder cap portion 116.
Further, FIG. 11 is a circuit diagram of a hydraulic circuit provided in the rod cutter 10 of the present embodiment.

Even when the piston rod 134 is pulled into the hydraulic cylinder 24, the tip end of the piston rod 134 protrudes from the cylinder cap portion 116 to the outside, and the tip end of the piston rod 134 is parallel to the shaft center. A mounting surface 142 is formed and a receiving surface 144 facing the protruding direction of the piston rod 134 is provided, and a movable blade 146 as a movable tool is provided with the blade mounting surface 14 of these.
2 and the receiving surface 144 are fixed by two bolts in a state of being in surface contact with and closely attached. Movable knife 146
Has a plate-like rectangular parallelepiped shape, and has four cutting edges 148a, 148b, 148c, each having a cutting edge angle of about 90 °.
148d (hereinafter, unless otherwise specified, simply the cutting edge 1
48), and these cutting edges 148 are attached in a posture in which the cutting edges 148 are parallel to the blade mounting surface 142 and are substantially perpendicular to the axial center of the piston rod 134, and The cutting edge 148 at a position separated from the cutting tool mounting surface 142, that is, the cutting edge 148a in the figure, is used for cutting the bar material 128. By inverting the movable blade 146 vertically and horizontally in FIG.
Any one of 48 will be subject to cutting.
In addition, the movable blade 146 in the vertical direction of FIGS.
Is larger than the length of the blade mounting surface 142, and the upper and lower ends of the movable blade 146 extend vertically from the piston rod 134.

The body frame 114 of the cutting jig 26 integrally connected to the hydraulic cylinder 24 via the cylinder cap portion 116 has a tip end side in the axial direction of the hydraulic cylinder 24, that is, a direction in which the piston rod 134 projects. The fixed blade 150 for cutting the rod 128 is fixed between the movable blade 146 and the movable blade 146 when the piston rod 134 is projected. That is, at the tip of the body frame 114, the blade mounting surface 1 is parallel to the axis of the piston rod 134.
52 is formed and a receiving surface 154 facing the protruding direction of the piston rod 134 is provided, and the fixed cutting tool 150 has the cutting tool mounting surface 152 and the receiving surface 154.
It is fixed by two bolts in a state of being in surface contact with and in close contact with. This fixed blade 150 is equivalent to a fixed tool, has a plate-like rectangular parallelepiped shape like the movable blade 146, and has four cutting edges 156a, 156b, 156c, each having a cutting edge angle of about 90 °. 156d (hereinafter, simply referred to as cutting edge 156 unless otherwise specified)
And the cutting edges 156 of these are attached to the blade mounting surface 15
2 is attached in a posture that is parallel to 2 and at a substantially right angle to the axis of the piston rod 134, and is located on the hydraulic cylinder 24 side and away from the blade attachment surface 152.
6, the cutting edge 156a is used for cutting the bar 128. By inverting the fixed blade 150 vertically and horizontally in FIG. 8, any one of the four cutting edges 156 is used for cutting. Also, the main body frame 11
4, a U-shaped cutout 158 is formed in a portion between the portion to which the fixed blade 150 is attached and the tip of the piston rod 134 in a state where the piston rod 134 is drawn into the hydraulic cylinder 24. A bar 128 can be relatively inserted between the objects 146 and 150.

The body frame 114 is also shown in FIG.
In FIG. 10, a pair of backups 160 and 162, which are brought into surface contact with the upper end portion and the lower end portion of the movable blade 146 extending vertically of the piston rod 134, are integrally provided. On the backup 160, 162, flat guide surfaces 164, 166 parallel to the blade mounting surface 152 on which the fixed blade 150 is mounted are formed, and the blade mounting surface 142 of the upper and lower ends of the movable blade 146 is formed. The surface on the side that is in close contact with the guide surface 1
When the movable blade 146 and the piston rod 134 are brought into surface contact with 64 and 166, the cutting edge 148 of the movable blade 146 is parallel to the cutting edge 156 of the fixed blade 150 around the axis of the piston rod 134. While being held in this posture, the piston rod 134 is guided in the axial direction. Since the backups 160 and 162 are in surface contact with the movable blade 146 in this way, when the body frame 114 is relatively rotated around the axis of the cylinder tube 112, the movable blade 146, and further the piston 118. Is also rotated integrally with its body frame 114. The distance between the guide surfaces 164 and 166 and the blade mounting surface 152 in the direction perpendicular to these surfaces is determined by the double blades 146 and 150.
Is approximately the same as or slightly larger than the dimension obtained by adding the plate thickness of.

A backup bolt 168 is screwed into the main body frame 114, and when cutting the rod 128, the portion located on the fixed blade 150 side in the axial direction of the rod 128 is the hydraulic cylinder 24 side, that is, in FIG. Prevents escape to the right. This backup bolt 1
The screwing amount of 68 is changed according to the diameter dimension of the rod member 128, and is positioned by the lock nut 170.

Next, the operation of the bar cutter 10 having the above structure will be described.

First, after adjusting the screw-in amount of the backup bolt 168 according to the diameter of the rod 128 to be cut, the grip 12 of the rod cutter 10 is grasped with one hand, and the posture and work of the rod 128 are performed. While adjusting the posture of the cutting jig 26 around the axis of the cylinder tube 112, in other words, the posture of the cutting jig 26 with respect to the grip portion 12 of the bar cutter 10 with the other hand according to personal preference, The cutting portion of the bar material 128 is positioned in the notch 158 of the cutting jig 26. Then, in that state, the switch 14
When the pressing operation is performed, the electric motor 16 is operated, the hydraulic oil is pumped to the switching valve 70 by the hydraulic pump 38, and the switching valve 70 is driven by the hydraulic pressure of the hydraulic oil.
Is switched so that the discharge oil passage 56 and the oil supply / exhaust oil passage 88 are communicated with each other and the communication between the oil supply / exhaust oil passage 88 and the oil discharge passage 90 is cut off. Flow into the pressurizing chamber 122. This allows
The piston rod 134 of the hydraulic cylinder 24 is projected, and the rod member 128 is cut by the movable blade 146 fixed to the tip of the piston rod 134 and the fixed blade 150 fixed to the main body frame 114. In this case, in this embodiment, since the movable blade 146 is guided by the backups 160 and 162, the piston rod 134 bends in the direction perpendicular to the axial center of the movable blade 146 due to cutting resistance or the like and the movable blade 146 is fixed. Cutlery 15
There is no danger of escaping from 0, and the bar 128 is cut well by the double-edged tools 146 and 150.

When the pushing operation of the switch 14 is released after the cutting of the rod 128, the operation of the electric motor 16 is stopped and the hydraulic oil is no longer supplied from the hydraulic pump 38 to the switching valve 70, the discharge oil passage 90 is formed. Since the supply / discharge oil passage 88 is communicated, the piston 118 of the hydraulic cylinder 24 is pushed back according to the urging force of the compression coil spring 140, and the working oil in the pressurizing chamber 122 is supplied / exhausted.
And the oil storage chamber 58 via the discharge oil passage 90, and further the tank 1
Returned to 8 As a result, the piston rod 134, to which the movable blade 146 is fixedly installed, is pulled back into the hydraulic cylinder 24, and a series of bar material cutting operations is completed. The pullback operation of the piston rod 134 is performed by the switch 14
It is performed at any time by releasing the pushing operation of. Further, when the pushing operation of the switch 14 is continued even after the piston rod 134 reaches the protruding end, the relief valve 94 is opened by the increase of the hydraulic pressure, and the hydraulic oil supplied from the hydraulic pump 38 is the branch oil. It is returned from the passage 96 into the tank 18 via the oil discharge passage 102.

Here, the bar cutter 10 of this embodiment.
The main body frame 114 of the cutting jig 26 is the connecting means 1
Since the cutting jig 26 is connected to the cylinder tube 112 via 90 and can freely rotate about the axis of the cylinder tube 112 within an angle range of about 360 °, it should be cut. By changing the posture of the cutting jig 26 in accordance with the posture of the rod 128,
The worker can cut the rod 128 in various postures without twisting his or her hand or body, which improves workability particularly in a narrow space. The bar cutter 10 includes a grip portion 12,
The electric motor 16, the tank 18, the hydraulic cylinder 24, the cutting jig 26, the hydraulic pump 38 and the like are integrally provided as a handy type, so that work is performed in a place where work conditions are relatively poor, such as a construction site. The cutting jig 26 can be rotated as described above, but the burden on the operator in a place where such conditions are bad can be greatly reduced.

The connecting means 190 is a female screw 125.
And the male screw 127 are screwed together to form the cylinder cap portion 116.
Is connected to the cylinder tube 112 with a screw, the rod cutter 10 is compact and lightweight as compared with the case where both are integrally connected using a bolt. That is, between these cylinder cap portion 116 and cylinder tube 112, a reaction force having substantially the same magnitude as the thrust of the piston 118, specifically, a large force required for cutting the rod 128, is separated from each other. Since it is added in the direction, when connecting with a bolt, the cylinder tube 112
It was necessary to arrange many bolts all around.

Further, the rod cutter 10 of this embodiment.
, The movable blade 146 is backed up by the backups 160 and 162, and is prevented from escaping in the direction away from the fixed blade 150 when the bar 128 is cut. Therefore, the gap between the fixed blade 150 and the movable blade 146 does not open, and the cut surface of the rod 128 is always substantially perpendicular to the axis thereof, even when butt welding such as gas pressure welding is performed thereafter. Since the work of grinding the cut surface with a grinder or the like becomes easy and the bar material 128 can be reasonably cut with a relatively small force, the cutting edges 148, 15
The wear of No. 6 is reduced and the lives of the cutting tools 146, 150 are improved. Further, since no twisting is generated at the fitting sliding portion between the piston rod 134 and the insertion hole 132, the wear life of the hydraulic cylinder 24 is shortened due to local wear, and a double-acting cylinder is used as the hydraulic cylinder 24. There is no risk of oil leaks when adopted.

Further, in this embodiment, a pair of backups 1
Since the upper and lower ends of the movable blade 146 are backed up by 60 and 162, it is easy to secure a large contact area as compared with the case where the piston rod 134 is backed up. Further, since the backups 160 and 162 restrict the rotation of the piston rod 134 around the axis, for example, a rotation-stop key is provided on the outer peripheral surface of the piston rod 134, and a key groove is provided in the insertion hole 132 so that the piston rod 134 is provided. It becomes unnecessary to perform detent of 134.

Further, in the present embodiment, the single-acting hydraulic cylinder 24 is used, and the changeover valve 70 which is switched depending on the supply state of the hydraulic oil from the hydraulic pump 38 is adopted, and the hydraulic cylinder 24 is pushed by pushing the switch 14. While the piston rod 134 is pushed out, the piston rod 134 is pulled in by releasing the pushing operation, so compared with, for example, the one in which the operation stop of the hydraulic pump 38 and the switching of the valve need to be respectively switched by a switch or the like. Thus, the operation becomes easy, and particularly in the handy type bar cutter 10 of this embodiment, the burden on the operator is greatly reduced and the work efficiency is improved. The rod cutter disclosed in Japanese Utility Model Publication No. 53-47269 is designed to automatically return when the piston rod 134 reaches the protruding end.
While the piston rod 134 cannot be returned midway, in the present embodiment, the piston rod 134 can be returned at any time simply by releasing the pressing of the switch 14, so that, for example, the blades 146, 150 bite the rod 128. The piston rod 134 can be easily and quickly retracted even when the piston rod 134 does not move due to being caught or an obstacle is found during the projection of the piston rod 134.

Next, another embodiment of the present invention will be described. In the following embodiments, the same parts as those in the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.

In the connecting means 194 of FIG. 12, instead of providing the engaging pin 180 and the screw 186, the tip end portion of the cylinder cap portion 116 of the main body frame 114 has an arbitrary angular width, for example, an angular width of about 90 °. The engagement pin 174 is provided upright on the outer peripheral surface of the cylinder tube 112 while the notch 172 is provided and the cylinder cap portion 116 is screwed together, and the engagement pin 174 is engaged with both circumferential wall surfaces of the notch 172. Cylinder cap 116
It is possible to perform relative rotation in an arbitrary angle range while preventing the slip-out of the. The notch 172 and the engaging pin 1
74 corresponds to a stopper means, and the connecting means 194 is configured to include the female screw 125, the male screw 127, the notch 172, and the engaging pin 174. Note that the relative rotation is
The allowable angle range is once as shown in FIG.
It is smaller than the rolling speed, and is about 90 ° in this embodiment.

Further, in the embodiment shown in FIGS. 13 to 15, the fitting hole 200 is formed in the cylinder cap portion 116 so as to be fitted to the cylinder tube 112 so as to be relatively movable. On the inner peripheral surface of the hole 200 and the outer peripheral surface of the cylinder tube 112, annular grooves 202 and 204 each having a semicircular cross section are provided so as to form an annular passage having a circular cross section when they are fitted together. There is. Then, a wire 20 such as a piano wire is provided in the annular passage.
By inserting 6 into the cylinder cap portion 11,
6 is connected to the cylinder tube 112 so as not to be detachable in the axial direction and to be rotatable relative to the shaft. A notch 208 that is long in the circumferential direction is formed in the cylinder cap portion 116 so as to open to the annular groove 202. The wire 206 is inserted into the annular passage from the notch 208 and both ends are bent. The notch 208 is locked at both ends in the circumferential direction. In this case, the fitting hole 200, the annular grooves 202 and 204, the wire 20
The connecting means 210 is configured to include 6. Note that FIG. 14 is a plan view showing the notch 208 portion, and FIG.
It is a figure which shows the XV-XV cross section in.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the first embodiment, the cylinder tube 112 is provided with the male screw 127 and the cylinder cap portion 116 is provided with the female screw 125 for screw connection. However, the female screw is formed on the cylinder tube 112 and the cylinder cap is formed. It is also possible to provide a male screw on the portion 116 and screw them together.

In the above embodiment, the pair of backups 160 and 162 are integrally provided on the main body frame 114. However, a backup member formed separately from the main body frame 114 is attached to the main body frame 11 by bolts or welding.
It may be fixed to No. 4. It should be noted that the above backup is not always essential when implementing the present invention.

The backup may be a sliding contact with the piston rod 134, or the piston rod 134 may be backed up via a sliding contact member fixed to the piston rod 134. In that case, it is also possible to use a backup having a curved arc-shaped guide surface corresponding to the outer peripheral surface of the piston rod 134. In that case, the rotation of the piston rod 134 can be stopped by a rotation stop key or the like. Become.

Further, in the above embodiment, the case where the present invention is applied to the handy type bar cutter 10 has been described, but the present invention is similarly applied to the stationary bar cutter and other hydraulic processing devices. obtain.

Further, in the switching valve 70 of the above embodiment, the compression coil spring 86 is interposed between the sub valve body 84 and the plug 74, but it is interposed between the main valve body 76 and the sub valve body 84. It does not matter if you insert it. Other switching valves such as an electromagnetic switching valve that is switched by a switch operation can be used, and a double-acting hydraulic cylinder in which a piston is reciprocally moved by hydraulic pressure can also be used.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a cutting jig and a hydraulic cylinder when the cutting jig is rotated 90 ° in the bar cutter of FIG. 2 which is an embodiment of the present invention. is there.

FIG. 2 is a front view showing the entire bar cutter which is an embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view showing the vicinity of a hydraulic pump of the rod cutter of FIG.

4 is a cross-sectional view of a second housing portion of the bar cutter of FIG. 2 provided with a hydraulic pump, IV in FIG.
It is a figure corresponding to a IV cross section.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 3;

7 is a cross-sectional view showing a state where the oil passage connection state of the switching valve shown in FIG. 6 is switched.

8 is a plan view of the cutting jig and hydraulic cylinder shown in FIG. 1. FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX in FIG.

11 is a hydraulic circuit diagram of the bar cutter of FIG. 2. FIG.

FIG. 12 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 13 is a view showing a main part of still another embodiment of the present invention,
It is a figure corresponding to the said FIG.

FIG. 14 is a plan view showing a cutout portion in the embodiment of FIG.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

10: Bar cutter (hydraulic processing device) 24: Hydraulic cylinder 112: Cylinder tube 116: Cylinder cap part (cylinder cap) 118: Piston 125: Female screw 127: Male screw 146: Movable knife (movable tool) 150: Fixed knife (fixed) Tool) 172: Notch (stopper means) 174: Engagement pin (stopper means) 180: Engagement pin (stopper means) 186: Screw (stopper means) 200: Fitting holes 202, 204: Annular groove 206: Wire

Claims (2)

(57) [Scope of utility model registration request] 1. A hydraulic machining apparatus for linearly driving a piston of a hydraulic cylinder by hydraulic pressure to perform machining between a movable tool provided on the piston and a fixed tool provided on a cylinder body of the hydraulic cylinder. In the above, the cylinder body has a cylinder tube into which the piston is slidably fitted, and a cylinder cap in which the fixing tool is provided, and the cylinder tube and the cylinder cap are the outer peripheral surfaces of one of them. while the internal thread provided on the external thread and the other of the inner peripheral surface provided on are consolidated by to be screwed, it is provided on both of the cylinder tube and the cylinder cap, the cylinder tube and the cylinder The cap is less than one turn along the threaded engagement of the male and female threads.
The hydraulic processing is characterized by having stopper means for permitting relative rotation around the axis by a predetermined angle and engaging with each other in the circumferential direction when the predetermined angle is exceeded to prevent further relative rotation. apparatus. 2. A piston of a hydraulic cylinder is hydraulically operated.
By being driven linearly, the piston mounted on the piston
Provided on the moving tool and the cylinder body of the hydraulic cylinder
In a hydraulic machining device that performs machining with a fixed tool, the piston is slidably fitted in the cylinder body.
Cylinder tube to be installed and the fixed tool
With a cylinder cap,
And the cylinder cap are relatively movable in the axial direction and
The other is relatively rotatably fitted, while it is fitted to the fitting part of the cylinder tube and cylinder cap.
The annular groove so as to form an annular passage in the fitted state.
And a wire is inserted through the annular passage.
The cylinder tube and cylinder
Is not detachable in the axial direction and can rotate relative to the shaft.
A hydraulic processing device characterized by being connected .