JPH09300123A - Hydraulic operating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause oil to be easily supplemented and also easily replaced with new one in a hydraulic operating machine in which a supplying means for supplying oil into a cylinder chamber so as to prevent occurrence of negative pressure within a hydraulic circuit for a tool when a movable tool is moved is installed in a head frame. SOLUTION: A hydraulic operating machine is comprised of a main body A of the operating machine provided with a head frame 5 and a cylinder chamber 13 to which a fixed machining tool 35 is fixed, and a piston B which is slidably arranged within the cylinder chamber 13 and to which a movable machining tool 33 is fixed, and a supplying means 46 for supplying oil into the cylinder chamber 13 when the movable machining tool 33 is moved. The supplying means 46 is comprised of a bag body 47 which is inserted into a storing hole part 45 of the head frame 5 and having its opening communicated with the cylinder chamber 13 through a hydraulic pump 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic actuator that uses hydraulic pressure to perform punching and cutting of a workpiece such as a steel material between a movable processing tool and a fixed processing tool, More specifically, the present invention relates to a hydraulic actuator in which a head frame is provided with a supply means for supplying oil into a cylinder chamber in order to prevent a negative pressure from being generated in a hydraulic circuit of a tool when a movable processing tool is moved. .

[0002]

2. Description of the Related Art Heretofore, as a hydraulic actuator of this type, as described in Japanese Utility Model Laid-Open No. 4-122494, Japanese Utility Model Laid-Open No. 3-19621, Japanese Utility Model Publication No. 5-36568, etc. A hole communicating with the hydraulic pump is formed in the head frame, and a flexible air bag whose inside is opened to the atmosphere is attached to the hole, and the outer peripheral portion of the air bag and the inside of the hole are attached. It is known that the supply means is composed of a peripheral surface.

In the hydraulic actuator described in the above publication, when the movable processing tool moves to the fixed processing tool side, the air bag expands so that the oil in the accommodation hole is sent into the cylinder chamber via the hydraulic pump to The movable processing tool is moved while preventing the generation of negative pressure in the circuit.

Further, as described in Japanese Utility Model Laid-Open No. 315018/1993, a hole portion communicating with a cylinder chamber via a hydraulic pump is formed in a head frame, and oil replenishment for sliding on the inner peripheral surface of the hole portion is provided. A hydraulic actuator provided with a working piston is also known.

In the hydraulic actuator described in the publication, when the movable processing tool moves to the fixed processing tool side, the oil replenishment piston slides on the inner peripheral surface of the hole so that the oil in the hole works through the hydraulic pump. It was sent to the cylinder chamber and moved the movable processing tool while preventing the generation of negative pressure in the hydraulic circuit.

[0006]

However, in the hydraulic actuator equipped with the air bag described above, when a hydraulic circuit is filled with oil to replenish or replace the oil, a certain amount of oil is first supplied. After injecting, it is necessary to move the movable processing tool to the fixed processing tool side and further inject oil in this state,
The work was complicated. In other words, the hydraulic actuator requires that the air bag is contracted when the hydraulic pump is not driven, that is, when the movable processing tool is separated from the fixed processing tool. The air bag is not sufficiently contracted only by injecting the oil in a state where it is separated from the fixed processing tool, so that it is necessary to re-inject the oil after moving the movable processing tool to the fixed processing tool side. Moreover, in a hydraulic actuator including a hydraulic circuit provided with a return valve or the like for returning the oil in the cylinder chamber when the movable processing tool moves by a certain amount or more, a work piece such as a reinforcing bar is fixed to the movable processing tool and the fixed processing tool. It was necessary to perform the above-mentioned oil injection work in a state of being sandwiched between and, and this work was particularly complicated.

Further, in the hydraulic actuator, the air bag is always in a contracted state because the movable processing tool is always separated from the fixed processing tool, and there is a possibility that the inner surfaces of the air bags are closely attached to each other. However, there is also a problem that the air bag deteriorates quickly.

On the other hand, in the hydraulic actuator equipped with the oil replenishing piston, the hole and the atmosphere are communicated with each other through the communication hole or the like in order to slide the oil replenishing piston when the movable processing tool is moved. However, there is a problem in that the oil replenishment piston cannot slide properly due to dust and the like entering the hole through the communication hole. Further, the hydraulic actuator has a problem in that the hole portion of the head frame needs to be formed on a smooth surface so that the oil supply piston can slide, and the manufacturing cost increases.

In a hydraulic actuator having an air bag as described above, a stopper provided at the opening edge of the air bag is a hole in the head frame as described in, for example, Japanese Utility Model Laid-Open No. 4-122494. Since the opening edge of the air bag is attached in close contact with the inner surface of the hole by screwing, there is a problem that the opening edge of the air bag is easily damaged by the rotation of the stopper during the screwing. In addition, the actual Kaihei 3-19621
Although the opening edge of the air bag of the hydraulic actuator described in Japanese Utility Model Publication No. 5-36568 is not in close contact with the inner surface of the hole, the air bag also has a bolt screwed to the nut inside the bag.
Since it is pressed against the mounting member, there is a problem in that the screw is screwed into the air bag to exert a force in opposite directions on the outer surface and the inner surface of the opening edge of the air bag, which tends to damage the opening edge of the air bag. Met. Moreover, the hydraulic actuator of this publication has a large number of parts in attaching the air bag, so that it is not possible to reduce the manufacturing cost, and there is a problem that the work for attaching and detaching the air bag is complicated. Was.

Therefore, the present invention has been made to solve the above-mentioned problems, and the first object of the present invention is to provide a hydraulic actuator in which replenishment and replacement work of oil is extremely easy. It is in.

A second object of the present invention is to provide a hydraulic actuator in which the bag body adopted for solving the above-mentioned first object can be attached and detached very easily and can be easily maintained. .

[0012]

[Means for Solving the Problems] In order to solve the above problems,
The hydraulic actuator according to the present invention includes an actuator main body A having a head frame 5 to which a fixed processing tool 35 is attached and a cylinder chamber 13, and a movable processing tool 33 slidably provided in the cylinder chamber 13. Is a hydraulic actuator having a supply means 46 for supplying oil into the cylinder chamber 13 when the movable processing tool 33 is moved, the supply means 46 comprising: The head frame 5 has a structure in which it is inserted into the accommodation hole 45 and the opening 55 is formed of a bag body 47 which is communicated with the cylinder chamber 13 via the hydraulic pump 17.

The hydraulic actuator according to the present invention having the above structure has a bag body when the movable processing tool 33 moves to the fixed processing tool 35 side.
When 47 is contracted, the oil inside the bag body 47 that is the supply means 46 is opened.
Since it is sent from the 55 into the cylinder chamber 13 via the hydraulic pump 17, it is possible to operate while preventing the generation of negative pressure generated in the hydraulic circuit.

In addition, in the hydraulic actuator according to the present invention, when the oil is injected into the hydraulic circuit at the time of replenishing and exchanging the oil, the bag 47 with the movable processing tool 33 and the fixed processing tool 35 separated from each other.
Since it expands, in this state, it is possible to store the oil necessary for moving the movable processing tool 33 inside the bag 47.

Further, in the hydraulic actuator according to the present invention, as described in claim 2, the accommodating hole portion 45 has an opening surface 45a for inserting and removing the bag body 47 on the outer surface of the head frame 5. ,
Further, the bag body 47 is composed of a retractable bag member 51 and an attachment member 53 fixed to the opening edge of the bag member 51 and having a communication hole 55 for communicating the bag member 51 and the cylinder chamber 13. Moreover, it is also possible to adopt a configuration in which the bag member 51 is provided with a perforation 73 at a position substantially opposite to the mounting member 53, and the perforation 73 is closed by a detachable closing member 77.
In the hydraulic actuator according to claim 2, the mounting member 53
The communication hole 55 corresponds to the opening 55 of the bag 47 according to the first aspect. When the mounting member 53 is inserted, the hydraulic actuator according to claim 2 having the above-mentioned structure releases the blocking member 77 to open the perforation 73 of the mounting member 53 and insert a rod-shaped member or the like into the perforation 73. The bag body 47 can be inserted into the accommodation hole portion 45 by pressing the mounting member 53 facing the perforation 73.

Further, in the hydraulic actuator according to claim 2, as described in claim 3, an oil chamber 9b filled with oil is provided on the other end side of the cylinder chamber 13 of the piston B, and the mounting member 53 is provided. It is also possible to adopt a configuration in which a communication hole 57 for communicating the oil chamber 9b and the bag body 47 is formed. In the hydraulic actuator according to claim 3 having the above configuration, when the movable processing tool 33 moves to the fixed processing tool 35 side, the oil in the oil chamber 9b passes through the bag body 47 and the hydraulic pump 17. Since it is sent into the cylinder chamber 13,
Not only 47, but also the oil chamber 9b can hold oil for supplying into the cylinder chamber 13.

Further, in the hydraulic actuator according to claim 2 or 3, the mounting member as described in claim 4 is provided.
The locked portion 59 is formed on the outer peripheral surface of the 53, and the locking member 61, into which the tip portion 61a can be engaged and disengaged, is attached to the locked portion 59.
And the locking member 61 is attached to the head frame.
5 It is also possible to employ a configuration in which the tip portion 61a is provided from the outer surface so that it can be engaged and disengaged. In the hydraulic actuator according to claim 4 having the above structure, when fixing the bag body 47 inserted into the accommodation hole portion 45, the locking member 61 is operated from the outer surface of the head frame 5 so that the tip end portion is operated. The mounting member 53 can be fixed by engaging the 61a with the locked portion 59 of the mounting member 53.

According to a fourth aspect of the hydraulic actuator, as described in the fifth aspect, the locked portion 59 is attached to the tip of the locking member 61.
It is also possible to employ a configuration in which a screw hole that can be screwed with 61a is provided and the locking member 61 is provided so as to be rotatable from the outer surface of the head frame 5. According to the hydraulic actuator having the above structure, the locking member 61 is rotated from the outer surface of the head frame 5 so that the tip portion 61a is screwed into the screw hole 59 of the mounting member 53, and the mounting member 53 is mounted. The 53 can be fixed in the accommodation hole 45.

Further, in the hydraulic actuator according to claim 4, as described in claim 6, the locking member 61 is screwed to the head frame 5 and is rotatably operated from the outer surface of the head frame 5. You can also do it. In the hydraulic actuator having the above structure, the locking member 61 is rotated from the outer surface of the head frame 5 so that the distal end portion 61a of the locking member 61 is inserted into the accommodation hole portion 45, and the distal end portion is formed. 61a is engaged with the locked portion 59 of the mounting member 53, and the mounting member 53 is inserted into the accommodation hole portion.
Can be fixed within 45.

Further, in the hydraulic actuator according to claims 4 to 6, as described in claim 7, the head frame 5 has a hole 65 through which the shaft portion 61b of the locking member 61 can be inserted. A sealing member capable of sealing the inner peripheral surface of the hole 65 and the outer peripheral surface of the locking member 61 when the tip end portion 61a of the locking member 61 is disengaged from the locked portion 59 of the mounting member 53. It is also possible to adopt a configuration in which 67 is interposed. In the hydraulic actuator according to claim 7 configured as described above, when the distal end portion 61a of the locking member 61 is disengaged from the mounting member 53 and the bag body 47 is pulled out from the accommodation hole portion 45, a hole is formed. Since the inner peripheral surface of 65 and the outer peripheral surface of the locking member 61 are sealed by the seal member 67, the oil flowing out into the accommodation hole portion 45 does not leak out of the head frame 5 through the hole 65. .

Further, in the hydraulic actuator according to the present invention, as described in claim 8, the accommodating hole portion 45 has an opening surface 45a for inserting and removing the bag body 47, and the bag body 47 has an outer peripheral surface. It is also possible to adopt a configuration in which the pipe member 83 is externally fitted, and the bag body 47 is formed with a projecting portion 47a capable of contacting the pipe member 83 when the bag body 47 is inserted. In the hydraulic actuator having the above structure, when the bag body 47 is inserted into the accommodation hole portion 45, the bag member 47 is pushed by the pipe member 83 to press the projecting portion 47a of the bag body 47. Can be inserted into the accommodation hole 45.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as one embodiment of the present invention, as shown in FIG. 1, an actuator main body A having a cylinder chamber 13 inside and a head frame 5 fixed to a front portion by a fixing bolt 6 is provided. , A piston B is slidably interposed in a cylinder chamber 13 of the actuator body A, a movable cutter 33 is attached to the piston B, and a fixed blade is opposed to the movable cutter 33.
A hydraulic actuator in which 35 is attached to the head frame 5 will be described below.

In the present embodiment, the actuator body A is
First housing 1 with an electric motor inside,
It is composed of a second housing 2 fixed to the front part of the first housing 1 and having a cylinder chamber 13 inside, a grip part 3 fixed to the upper part of each housing 1, 2 and the head frame 5. The head frame 5 is fixed to the front part of the second housing 2. The grip part
At the bottom of 3 is a switch that activates and deactivates the electric motor.
7 are provided.

The first housing 1 and the second housing 2
A space is provided between and, and a first oil chamber 9a for storing oil to be supplied to the cylinder chamber 13 is formed.

Further, a plurality of feed passages 11 are formed in the peripheral portion of the second housing 2, and the feed passage 11 is slidable by the ram 25 from the first oil chamber 9a to the cylinder. The following structure is provided for causing the flow of oil to the chamber 13.

A drive shaft 19 of an electric motor (not shown) provided inside the first housing 1 is provided so as to project from the first housing 1 to the inside of the second housing 2.
An eccentric cam 21 is fixed to the tip of the drive shaft 19.
A plurality of rams 25 are radially arranged inside the second housing 2 so that one end abuts on the eccentric cam 21 and the other end abuts on the valve body 15. It is openable and closable. In other words, the rotation of the drive shaft 19 causes the ram 25 that comes into contact with the eccentric cam 21 to slide, and the sliding of the ram 25 causes the valve body 15 to open and close the feed passage 11, and the ram 25
The oil in the first oil chamber 9a is fed to the cylinder chamber 13 via the feed passage 11 by sliding and the opening and closing of the valve body 15. In addition, in the present embodiment, the valve body 15, the eccentric cam 21, and the ram 25 constitute a hydraulic pump 17 in the present invention.

Further, the second housing 2 is formed with a return passage 41 which is opened and closed by a return valve 43 at the center thereof, and when the return valve 43 is opened, the return passage 41 opens the cylinder chamber 13 to the oil chamber. It is configured to send oil back to 9a.

The return valve 43 has a piston B
It is slidably attached to a tubular body 31 fixed to the rear side of the recessed portion 29 inside, and at both ends of the return valve 43, collar portions 43a, 43b that come into contact with the tubular body 31 are provided. Has been formed. As a result, the piston B moves forward and the front surface of the tubular body 31 comes into contact with the front flange portion 43a of the return valve 43 and moves forward, thereby opening the return passage 41, while moving the piston B backward. The rear surface of the cylindrical body 31 is a return valve
The return valve 43 is configured to be closed by contacting the rear flange portion 43b of 43 with the return valve 43 moving rearward and contacting the front surface of the second housing 2.

Further, the piston B is composed of a flange portion 37 slidable in the cylinder chamber 13 and a rod 39 protruding forward from the flange portion 37, and the front surface of the flange portion 37 and the head frame 5 are formed. A second oil chamber 9b is formed between the inner surface and the inner surface.

The head frame 5 is the rod.
39 has a slidable hole, through which the rod 39
A tip portion 39a of the movable cutter 33 is attached to the tip portion 39a.

Further, the head frame 5 has a pillar portion 5a extending forwardly below the movable cutter 33, and the pillar portion 5a.
It is formed in a substantially U shape in a side view by rising upwards and by the bent portion 5b for fixing the fixed blade 35 by facing the movable cutter 33.

An accommodating hole portion 45 is formed in the pillar portion 5a of the head frame 5 from the front outer surface portion to the second housing 2 and the accommodating hole portion 45 is formed in the accommodating hole portion 45. Bag 47 capable of storing the oil supplied to the first oil chamber 9a
Has been inserted. The front opening surface of the accommodation hole 45
A female screw is formed on the inner peripheral surface of 45a, a lid 49 having a hole in the center is attached to the female screw, and the accommodation hole 45 is closed while communicating with the atmosphere.

Further, the accommodating hole portion 45 is formed in a substantially columnar shape, and the diameter thereof is narrowed at the rear portion thereof.
b is formed.

The bag 47 is a shrinkable bag member 51.
And a mounting member 53 fixed to the opening edge of the bag member 51. Here, a bag member is provided inside the mounting member 53.
It has a first continuous hole 55 for communicating the 51 with the first oil chamber 9a and the cylinder chamber 13. In the present embodiment, the first through hole 55 of the mounting member 53 corresponds to the opening 55 of the bag 47 of the present invention.

Further, inside the mounting member 53, a second communication hole 57 for communicating the bag member 51 and the second oil chamber 9b is formed in addition to the first communication hole 55. In the present embodiment, the second communication hole 57 corresponds to the communication hole 57 described in claim 3.

In FIG. 1, 56 is the second housing 2
Reference numeral 58 denotes a communication passage formed in the head frame 5 for communicating the first communication hole 55 with the first oil chamber 9a, and 58 is formed in the head frame 5 with the second communication hole 57 and the second oil chamber 9b. Shows a communication path for communicating with each other.

A screw hole 59 is formed on the outer peripheral surface of the mounting member 53, into which a tip 61a of a bolt 61 (locking member) protruding inward from the small diameter portion 45b of the accommodation hole 45 is screwed. Has been done. In addition, the shaft of the bolt 61 is
A hole 65 is formed through which the hole 61b can be inserted.
The outer surface of the head frame 5 is formed with a recess having a diameter larger than that of the head portion 61c of the bolt 61 and having a depth capable of accommodating so that the head portion 61c does not protrude from the outer surface. By rotating the head 61c, the tip 61
a projects from the inner surface of the accommodation hole 45 and is screwed into the screw hole 59.

Further, the inner peripheral surface of the hole 65 is a seal member capable of sealing the inner peripheral surface and the outer peripheral surface of the shaft portion 61b of the bolt 61.
67 is attached, and the seal member 67 is attached at a position where a sealing effect is exhibited even when the tip end 61a of the bolt 61 is unscrewed from the screw hole 59.

An O-ring 71 is externally fitted to the outer peripheral surface of the mounting member 53 as shown in FIG.
The small-diameter portion 45b of 45 is hermetically sealed.

Further, the opening edge of the bag member 51 is fitted into the circumferential groove 69 formed on the front surface side of the mounting member 53, and the O-ring 72 is fitted from the outer circumference of the circumferential groove 69, It is attached to the attachment member 53. The outer peripheral surface of the O-ring 72 is in contact with the small diameter portion 45b of the accommodation hole portion 45, so that the bag member 51 and the mounting member 53 are more reliably sealed.

Further, as shown in FIG. 1, the bag member 51 is provided with a perforation 73 at the front, that is, at a position opposed to the mounting member 53, and a closing member 77 is fitted into the perforation 73.
The closing member 77 has a male screw 75 screwed therein to expand its diameter, whereby the perforation 73 is closed by the closing member 77. Here, an O-ring is also interposed between the male screw 75 and the closing member 77.

Reference numeral 79 in the figure denotes a spring which constantly presses the piston B rearward.

Since the hydraulic actuator of the present embodiment has the above-mentioned structure, the work piece such as the reinforcing bar is cut by the following steps.

First, when the electric motor is driven, the oil in the first oil chamber 9a is sent to the cylinder chamber 13 by the hydraulic pump 17,
Cylinder chamber 13 becomes high pressure, piston B spring 79
It moves to the front side against the pressing force of. Due to the movement of the piston B, the oil in the second oil chamber 9b passes through the second communication passage 58, the second communication hole 57, the bag member 51, the first communication hole 55, and the first communication passage 56, and the first oil chamber. Sent to 9a. At this time, since the volume increase in the cylinder chamber 13 due to the movement of the piston B to the front side is larger than the volume decrease in the second oil chamber 9b due to the existence of the rod 39 of the piston B, a negative pressure is applied to the first oil chamber 9a side. As a result of this negative pressure, the bag member 51 contracts, and the oil inside the bag member 51 is transferred to the first oil chamber 9a.
Is supplied to.

Then, the piston B moves forward to move the cylindrical body.
The front surface of 31 comes into contact with the front flange portion 43a of the return valve 43 and moves forward to open the return passage 41, the oil flows from the cylinder chamber 13 into the first oil chamber 9a, and the piston B causes the spring 79 to move. It moves backward due to the pressing force of.

Thereafter, the piston B retracts, the collar portion 43b behind the return valve 43 contacts the rear surface of the tubular body 31, the return valve 43 retracts, and the collar portion 43b behind the return valve 43 moves to the first position. When the two housings 2 are brought into contact with each other, the return passage 41 is closed, the rearward movement of the piston B is blocked, and the piston B is stopped. By the movement of the piston B toward the rear side, oil flows into the bag member 51 and the bag member 51 expands.

When the bag 47 of the hydraulic actuator of this embodiment is removed for maintenance, a lid 49 is used.
Is released to open the opening surface 45a of the accommodation hole portion 45, the tip end portion 61a of the bolt 61 is further unscrewed from the screw hole 59 of the mounting member 53, and the bag body 47 is pulled out from the opening surface 45a. . At this time, since the opening surface 45a is formed on the front surface of the head frame 5, it is possible to perform the pulling-out operation with the rear portion of the hydraulic actuator standing down, which allows the hydraulic circuit to operate in the hydraulic circuit. It has the advantage that the withdrawal operation can be performed without emptying the oil. Moreover, when the bag body 47 is pulled out from the accommodation hole portion 45 in this way, the seal member 67 seals between the shaft portion 61b of the bolt 61 and the drilled hole 65. This has an advantage that the oil that flows out does not leak to the outside of the head frame 5 through the hole 65.

Further, when the bag body 47 is inserted into the accommodation hole portion 45, first, the closing member 77 is removed to open the perforation 73, and a rod-shaped member is inserted into the opened perforation 73 to move the mounting member 53 rearward. This is done by pressing the mounting member 53 to the small diameter portion 45b by pushing it to the side and fixing the mounting member 53 by screwing the tip end portion 61a of the bolt 61 into the screw hole 59. in this way,
The bag body 47 can be easily inserted and attached using the perforations 73,
In particular, the bag body 47 of this embodiment accommodates the O-rings 71 and 72 in the hole portion.
Although it is necessary to abut and mount the contact hole 45, only the rear portion of the accommodation hole portion 45 is formed as the small-diameter portion 45b, which has an advantage that the pushing operation is easy.

Further, since the bag body 47 is fixed by screwing the front end portion 61a of the mounting member 53 into the screw hole 59 of the mounting member 53, the mounting member 53 is securely screwed into the accommodation hole portion.
Can be fixed within 45.

Further, when the hydraulic circuit is filled with oil when replenishing or exchanging the oil, when the movable processing tool 33 and the fixed processing tool 35 are separated from each other, a lubrication port (not shown) is provided. By injecting oil, it is possible to store the oil necessary for moving the movable processing tool 33 inside the bag body 47, which has the advantage that the oil injection work can be performed very easily.
Note that the injection work can be performed through the perforations 73 of the bag member 51 of the bag body 47 inserted into the accommodation hole portion 45 in some cases.

Further, since the hydraulic actuator of this embodiment has the accommodation hole 45 formed in the head frame 5, it has an advantage that the entire apparatus can be downsized and the weight can be reduced.

Although the present embodiment has the above-mentioned advantages because it has the above-mentioned configuration, the present invention is not limited to this, and the design can be changed appropriately within the scope intended by the present invention. That is, in the present invention, the movable processing tool 33, the fixed processing tool
Reference numeral 35 is not limited to the movable cutter 33 and the fixed blade 35, and other movable punches, fixed dies, and the like can be appropriately modified in design.

Further, the specific structure of the hydraulic pump 17 is not limited to that of the above-mentioned embodiment, and the design can be changed as appropriate. Further, in the above-mentioned embodiment, two oil chambers 9a and 9b are provided. Although described, the present invention is not limited to this. However, if the front of the piston B is also formed as the oil chamber 9 as in the above embodiment, the bag body 47 is
It has the advantage that even a small amount of oil is stored in.

When two oil chambers 9a and 9b are provided as in the above embodiment, the valve cylinder chamber 13 to the oil chamber
It is possible to provide a return valve for returning the oil from the oil chamber 9b to the oil chamber 9a, like the return valve 43 for returning the oil to 9a. Further, even when the bag body 47 has the mounting member 53 and two oil chambers 9a, 9b are provided, the mounting member 53 has the communication hole 5 communicating with the two oil chambers 9a, 9b as in the above embodiment.
It is not necessary to form 5,57 respectively, for example, two oil chambers 9a,
It is also possible to form a communication hole for connecting the second oil chamber 9b and the bag body 47 by connecting one communication hole 55 to the communication passage that communicates 9b, and as shown in FIG. It is also possible to connect the one communication hole 55, 57 as one hole on the bag member 51 side.

Further, the shapes of the actuator main body A, the piston B, etc. can be appropriately changed in design within the scope intended by the present invention.
The cylinder chamber 13 is not limited to the one formed in the second housing 2, but may be formed in the head frame 5.

Further, the specific structure of the bag body 47 is not limited to that of the above-mentioned embodiment, and the bag body 47 is inserted into the accommodation hole portion 45 of the head frame 5 and the opening portion 55 is inserted through the hydraulic pump 17 into the cylinder. Anything in communication with chamber 13 is within the contemplation of the invention.

The means for inserting the bag body 47 is not limited to the one in which the mounting member 53 is fixed by the bolts 61 as in the above embodiment, and for example, as shown in FIG. The pipe member 83 is externally fitted, and the protruding portion 47a is formed in the bag body 47 so that the bag body 47 is pressed rearward by the rear end portion of the pipe member 83 when the bag body 47 is inserted. May be. In the hydraulic actuator shown in FIG. 3, the pipe member 83 has the front surface thereof at the opening surface 45 of the head frame 5.
The bag body 47 is fixed by being pushed rearward by the lid body 49 screwed into the female screw portion of a. However, it is preferable to provide the perforation hole 65 as in the above-described embodiment and to insert the bag body 47 by utilizing the perforation hole 65, whereby the bag body 47 can be surely inserted and attached, and the pipe There is also an advantage that parts such as the member 83 are not required and the number of parts can be reduced.

On the other hand, as shown in FIG. 3, a pipe member 83 is fitted on the outer peripheral surface of the bag body 47, and the pipe member 83 is inserted into the bag body 47 at the time of insertion.
When the projecting portion 47a with which the 83 can abut is formed, the drilling hole 65 is formed.
Although it has an advantage that it is not necessary to provide the hole, the hole 65 is provided, and the pipe member 83 is fixed by the locking member 61 that is inserted into the hole 65. Can also be formed. As described above, the pipe member 83, not the mounting member 53, is fixed by the locking member 61, and the configuration according to claims 4 to 7 is employed, that is, the locked state of the mounting member 53 according to claims 4 to 7. By replacing the structure of the portion 59 with the locked portion of the pipe member 83, the same effects as those of claims 4 to 7 can be obtained.

Further, even when the locking member 61 such as a bolt is engaged with the locked portion of the mounting member 53 to fix the bag body 47 as described in claim 4, the locked portion 59 is used as the locked portion 59. The present invention is not limited to the one using the screw hole 59, and for example, as shown in FIG. 4, a fixing concave portion 59 in which a screw is not formed may be provided on the outer peripheral surface of the mounting member 53 as a locked portion. In the hydraulic actuator shown in FIG. 4, a female screw is formed on the inner surface of the hole 65 of the head frame 5, and the head frame 5 has a tip portion 61a screwed into a fixing recess 59 and detachable bolt 61. The head 61c of the bolt 61 is formed so as to be rotatable from the outer surface of the head frame 5. When the fixing recess 59 is formed in the mounting member 53 in this manner, the fixing recess 59 is formed.
It is also possible to configure a groove formed in the mounting member 53 in the circumferential direction. If the fixing recess 59 is formed of a groove in this manner, the bag body 47 rotates when the bag body 47 is inserted. Also, there is an advantage that the tip end portion 61a of the locking means 61 can be easily and accurately engaged with the fixing recess 59.

Furthermore, in order to prevent the locking member 61 from being accidentally detached from the locked portion 59, the locked portion 59 (screw hole) and the locking member 61 as in the above embodiment are screwed. Or screwing the head frame 5 and the locking member 61 as shown in FIG.
For example, as shown in FIG. 6, a step 89 is provided in the hole 65, and a washer 91 that can be expanded and contracted is attached to the head 61c of the locking member 61.
By fitting the washer 91 into the stepped portion 89, the locking member 61 can be attached so that the distal end portion 61a can be engaged and disengaged from the outer surface of the head frame 5. However, if the locking member 61 is prevented from being unintentionally disengaged by screwing the locking member 61, there is an advantage that the attaching / detaching work is easier than in the case of using the washer 91 as described above.

Further, when the tip portion 61a of the locking member 61 is detached from the mounting member 53 as in the above embodiment, the hole 65 is formed.
The above-described advantage is obtained by interposing the seal member 67 capable of sealing the inner peripheral surface of the bolt and the outer peripheral surface of the locking member 61. For example, as shown in FIG. It is also possible to interpose the packing 87 between the recessed portion on the outer surface.

[0062]

As described above, in the hydraulic actuator according to the present invention, the supply means for supplying oil into the cylinder chamber is inserted into the accommodation hole of the head frame and the opening is provided via the hydraulic pump. Since the bag is communicated with the cylinder chamber, it is possible to replenish and replace the oil by injecting the oil while the movable processing tool and the fixed processing tool are separated from each other, which is extremely easy. Has the effect.

Further, in the hydraulic actuator according to the second aspect of the present invention, the closing member of the bag member is detached to open the perforation of the mounting member, and a rod member or the like is inserted into the perforation to press the mounting member facing the perforation. By doing so, the bag body can be extremely easily inserted into the accommodation hole portion, whereby the bag body can be easily inserted and attached through the opening of the head frame, and the maintenance work of the bag body can be performed extremely easily. Has the effect.

Further, in the hydraulic actuator according to the third aspect, an oil chamber filled with oil is provided on the other end side of the cylinder chamber of the piston, and the mounting member connects the oil chamber and the bag body. Since the communication hole is formed, the oil for supplying into the cylinder chamber can be retained not only in the bag body but also in the oil chamber on the other end side of the cylinder of the piston. It has the effect that even a small amount is sufficient.

Further, in the hydraulic actuator according to the fourth aspect, by operating the locking member from the outer surface of the head frame,
This has an effect that the mounting member can be fixed and maintenance work can be easily performed.

Further, in the hydraulic actuator according to the fifth aspect, the bag member can be easily fixed by rotating the locking member from the outer surface of the head frame, which facilitates maintenance work and locks the bag member. Since the member is screwed, it is possible to prevent the locking member from being accidentally detached.

Further, in the hydraulic actuator according to the sixth aspect, by rotating the locking member from the outer surface of the head frame and screwing the locking member, the tip portion is engaged with the locked portion and the bag body is inserted. Since the head frame and the locking member can be fixed and the maintenance work is easy, the locking member can be prevented from being accidentally detached.

Further, in the hydraulic actuator according to the seventh aspect, when the distal end portion of the locking member is disengaged from the mounting member and the bag body is pulled out from the accommodation hole portion, the hydraulic actuator is locked to the inner peripheral surface of the hole. Since the outer peripheral surface of the member is sealed by the seal member, the oil flowing out into the accommodation hole does not leak out of the head frame through the perforation hole, and the maintenance work of the bag body is extremely easy.

In the hydraulic actuator according to the present invention, the bag member can be inserted into the accommodation hole very easily by pressing the protruding portion of the bag member with the pipe member. It is possible to easily insert the bag into the opening of the head frame, and it is possible to perform the maintenance work of the bag extremely easily.

[Brief description of drawings]

FIG. 1 is a side view including a partial cross section of a hydraulic actuator according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional side view of an essential part of the hydraulic actuator according to the embodiment.

FIG. 3 is an enlarged sectional side view of a main part of a hydraulic actuator according to another embodiment.

FIG. 4 is an enlarged cross-sectional side view of essential parts of a hydraulic actuator according to another embodiment.

FIG. 5 is an enlarged cross-sectional side view of essential parts of a hydraulic actuator according to another embodiment.

FIG. 6 is an enlarged cross-sectional side view of essential parts of a hydraulic actuator according to another embodiment.

[Explanation of symbols]

A ... actuator body, B ... piston, 5 ... head frame,
9a, 9b ... Oil chamber, 13 ... Cylinder chamber, 17 ... Hydraulic pump, 33 ...
Movable processing tool (movable cutter), 35 ... Fixed processing tool (fixed blade), 45 ... Housing hole portion, 45a ... Opening surface, 46 ... Supplying means, 47
... Bag, 47a ... Banded portion, 51 ... Bag member, 53 ... Mounting member, 55
... Opening (communication hole), 59 ... Locked part (screw hole, fixing recess), 61 ... Locking member, 61a ... Tip part, 61b ... Shaft part, 65 ...
Perforation hole, 67 ... Seal member, 73 ... Perforation, 77 ... Closure member, 83
... Pipe members

Claims (8)

[Claims] 1. A main body of an actuator comprising a head frame (5) to which a fixed processing tool (35) is attached and a cylinder chamber (13).
(A) and a piston (B) slidably provided in the cylinder chamber (13) and having a movable processing tool (33) attached thereto, and the head frame (5) has a movable processing tool (33). ) Is a hydraulic actuator having a supply means (46) for supplying oil into the cylinder chamber (13), the supply means (46) being provided in the accommodation hole (45) of the head frame (5). Inserted and opening (55)
Is formed of a bag body (47) communicating with the cylinder chamber (13) via a hydraulic pump (17). 2. The accommodation hole portion (45) has an opening surface (45a) for inserting and removing the bag body (47), and the bag body (47).
Is a shrinkable bag member (51) and a mounting member fixed to the opening edge of the bag member (51) and having a communication hole (55) for communicating the bag member (51) and the cylinder chamber (13). (53) and the bag member (51) is provided with a perforation (73) at a position substantially opposite to the mounting member (53), and the perforation (73) is removable. The hydraulic actuator according to claim 1, wherein the hydraulic actuator is closed by (77). 3. An oil chamber (9b) filled with oil is provided at the other end of the cylinder chamber (13) of the piston (B), and the mounting member (53) is provided with the oil chamber (9b). 3. The hydraulic actuator according to claim 2, further comprising a communication hole (57) for communicating the bag (47) and the bag body (47). 4. The outer peripheral surface of the mounting member (53) has a locked portion.
(59) is formed, and a tip portion (61a) is formed on the locked portion (59).
A locking member (61) that can be engaged and disengaged with is attached to the head frame (5), and the locking member (61) is the head frame.
(5) The hydraulic actuator according to claim 2 or 3, wherein the tip portion (61a) is provided so as to be engageable with and disengageable from the outer surface. 5. The locking member (59) comprises a screw hole which can be screwed into the tip end portion (61a) of the locking member (61), and the locking member (61).
The hydraulic actuator according to claim 4, wherein is provided so as to be rotatable from the outer surface of the head frame (5). 6. The locking member (61) is a head frame (5)
5. The hydraulic actuator according to claim 4, wherein the hydraulic member is screwed to the shaft, and the locking member (61) is rotatably operated from the outer surface of the head frame (5). 7. The head frame (5) is the locking member.
It has a hole (65) through which the shaft portion (61b) of (61) can be inserted, and the tip portion (61a) of the locking member (61) is attached to the mounting member (5).
A seal member (67) is interposed which can seal the inner peripheral surface of the hole (65) and the outer peripheral surface of the locking member (61) when the lock member (59) is detached from the locked portion (59). The hydraulic actuator according to any one of claims 4 to 6, wherein: 8. The accommodation hole (45) has an opening surface (45a) for inserting and removing the bag body (47), and a pipe member (45a) is provided on an outer peripheral surface of the bag body (47). 83) is externally fitted, and the bag body (47)
2. The hydraulic actuator according to claim 1, wherein a projecting portion (47a) is formed in the bag body (47) so as to come into contact with the pipe member (83) when the bag body (47) is inserted.