JPH081815Y2 - Portable hydraulic processing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] This invention supplies pressurized oil to move a piston,
The present invention relates to a portable hydraulic machine that performs desired machining such as punching with a machining jig such as a punch at the tip of a piston.

[Conventional technology]

For example, in construction work sites, civil engineering work sites, etc., it is necessary to perform machining such as cutting and bending of reinforcing bars and pipes, punching of steel plates and shaped steels, and are called reinforcing bar cutters, reinforcing bar benders, electric punchers, etc. Various portable hydraulic processing machines are used.

In this type of portable hydraulic processing machine, a piston is reciprocally disposed in a cylinder forming a part of a main body, and a pair of chambers are formed by a piston head.
It is defined on the left and right of the piston head in the cylinder. A reservoir (oil tank) is formed in the housing adjacent to the cylinder, and the pair of chambers are in communication with the reservoir.
Then, in one of the chambers (second chamber), a return spring made of, for example, a compression coil spring is arranged. The main body usually consists of a housing, a cylinder, a pump case, and a motor housing.One processing jig is attached to the piston tip and the other processing jig is attached to the housing tip, and the motor and pump are the pump case and motor. Each is built into the housing.

When the start switch is operated to operate the motor and pump, the oil in the reservoir is sent to the pump chamber through the flow path on the side wall of the cylinder and is pressurized to be pumped from the pump chamber to the other chamber (first chamber). Is supplied to. Then, the piston moves forward against the biasing force of the return spring, and the machining jig on the tip of the piston and the machining jig on the housing perform desired machining on the reinforcing bar, steel plate, and the like.

When the rebar, the steel plate, etc. are subjected to desired machining, the pressurized oil in the first chamber flows into the second chamber and is drained to the reservoir via the second chamber. Also, the first
The pressurized oil in the chamber can also be directly returned to the pump chamber. With the outflow of the pressurized oil, the biasing force of the return spring causes the piston to move in the return path and return to the initial position.

Regardless of whether the piston moves in the forward or return path,
As the piston moves, the volume of the second chamber changes, and unless the volume change of the chamber is sufficiently compensated, a negative pressure is generated in the chamber, which makes it difficult to smoothly move the piston.

Therefore, in a known portable hydraulic processing machine, a flexible airbag that prevents negative pressure from being generated is arranged in a reservoir that is directly or indirectly opened to the second chamber. The airbag is arranged so that the inside thereof is open to the atmosphere and expands or contracts to prevent a negative pressure from being generated in the chamber.

[Problems to be solved by the device]

A mounting hole for accommodating the airbag is formed in the housing in communication with the reservoir. The mounting hole is a through hole for opening the inside of the airbag to the atmosphere.
As illustrated in JP-A-55-018568, it is formed in the housing in parallel with the axis.

By the way, a processing jig such as a (fixed) cutter, a die, and a fixed block is fixed to the front end of the housing while facing a processing jig such as a cutter, a punch, and a bending shoe at the tip of the piston. Then, in order to secure a space for inserting and arranging a workpiece such as a reinforcing bar and a steel plate, the center of the upper surface of the housing is cut out, and the processing jig fixing portion at the tip of the housing is inevitably cantilevered.

The pressure of the pressurized oil transmitted to the piston is applied to the workpiece through a machining jig at the tip of the piston during machining. Since the processing jig fixing portion at the housing tip supports the workpiece behind, a large pressure acts on the processing jig fixing portion at the housing tip, and the processing jig fixing portion has a cantilever shape. A large bending moment is generated in the fixed part of the processing jig.

Since the distance from the base of the part where the processing jig is fixed at the tip of the housing to the bottom of the housing (minimum height of the housing) is restricted, the airbag mounting hole should be located close to the base of the part where the processing jig is fixed. I have no choice. Therefore, a sufficient thickness cannot be secured between the root of the processing jig fixed portion and the mounting hole, and the strength near the root of the processing jig fixed portion is insufficient. Therefore, due to the bending moment, the housing may bend and break near the base of the processing jig fixing portion, so that the diameter of the machinable rebar, the thickness of the steel plate, the hole diameter, etc. are limited. .

If the height of the housing is increased to secure a sufficient thickness between the base of the processing jig fixing portion and the mounting hole, a wide range of machining can be performed. However, if the height of the housing is increased, the size of the housing is increased and the cylinder adjacent to the housing is inevitably increased in size, which is not preferable because the weight of the portable hydraulic processing machine is increased.

Further, if the stroke of the piston is lengthened, the workable range is expanded (for example, the thickness that can be drilled and the bendable angle that can be processed are increased), so it is desirable to lengthen the stroke of the piston. If the stroke of the piston is long, the volume variation of the chamber becomes large, and an air bag having a large volume is required.

Here, if the diameter of the airbag is increased and the length thereof is increased, a large volume is secured. However, if an air bag with a large diameter is used, the distance between the mounting jig fixing part of the housing and the mounting holes will be smaller (thinner thickness will be smaller), and sufficient strength will be obtained at the processing jig fixing part. I can't. Also, since the left and right ends of the housing are rounded with some parts missing, it is not possible to separate the mounting hole from the root so that it is difficult to use an air bag with a large diameter, that is, an air bag with a large volume. I can't use the bag,
The stroke of the piston cannot be taken long.

The purpose of this invention is to provide a portable hydraulic processing machine that can use an airbag with a large volume without increasing the height of the housing and without compromising the strength of the root of the processing jig fixing part of the housing. There is.

[Problems to be solved by the device]

In order to achieve this object, according to the present invention, the attachment hole of the airbag is provided so as to be inclined in a direction away from the axis as it approaches the front end of the housing.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a portable hydraulic machine 10 according to the present invention comprises a substantially cylindrical main body 12 formed from a casting alloy, the main body being a housing 13, a cylinder 14, a pump case.
The motor housing 16 is bolted to each other with a seal packing interposed. And the piston
A cylinder 17 is reciprocally arranged in the cylinder 14, and a machining jig 22 is bolted to the tip of the piston rod 18.
In the embodiment, the processing machine 10 is embodied as an electric puncher, and the punch is detachably fixed to the tip of the piston.

The cylinder 14 is divided into a pair of chambers 14a and 14b by a piston head 23, and a return spring 24 such as a compression coil spring serves as a chamber (second chamber) 14 of the cylinder.
It is located in b. A return valve 26 for allowing the pressurized oil in the other chamber (first chamber) 14a to flow into the chamber 14b is attached to the piston head 23. This return valve is opened when the piston 17 advances a predetermined distance, and prevents the piston from excessively advancing.
A seal ring 27 is wound around the piston head 23. The position stopper lever 28 is rotatably attached to the upper surface of the cylinder 14, and when the position stopper lever is rotated, the flow path 29 is partially opened to connect the chamber 14a and the pump chamber. When the position stopper lever 28 is operated and the piston 17 is moved forward with the flow path 29 partially opened, the punch 22 at the piston tip is lightly pressed by the workpiece to check whether it is properly centered. it can.

The pump and motor are the pump case 15 on the right side of the cylinder.
It is housed in the motor housing 16, and a die 30 which is another processing jig is arranged at the tip of the housing 13 on the left side of the cylinder. The pump chamber of the pump case is communicated with the chamber 14a by the flow path 31 on the side wall of the cylinder.

A notch 32 is formed in the center of the upper surface of the housing 13 to secure a space for inserting and arranging a workpiece such as a steel plate. Therefore, the processing jig fixing part 13a at the tip of the housing
Has a cantilever shape.

A reservoir 34 is formed in the housing 13, and the reservoir and the chamber 14b are in communication with each other via a connection path 36. And
A mounting hole 40 communicating with the reservoir 34 is formed in the housing 13. Here, the reservoir 34 may be opened to the chamber 14b so that the reservoir and the chamber 14b are directly communicated with each other.

In the known configuration, the mounting hole is formed in parallel with the axis line, whereas in the present invention, the mounting hole 40 is formed in the axis line 11.
It is not parallel to and is inclined in a direction away from the axis as it approaches the housing tip. That is, in this invention, the mounting hole 40 is formed so as to open in the housing front end surface 13c and be inclined toward the axis 11 as it moves away from the housing front end. Therefore, the mounting hole 40 with a large diameter can be set apart from the root 13b of the machining jig fixing part, and the necessary wall thickness can be obtained between the root of the machining jig fixing part and the mounting hole 40, and the strength of the root can be improved. Reinforced,
Required strength can be secured near the root. Therefore, during the drilling process, the pressure of the pressurized oil is applied to the steel plate (workpiece) via the punch 22 at the tip of the piston, and a large bending moment is generated in the cantilevered machining jig fixing portion 13a. In addition, the root 13b withstands a bending moment and prevents the bending of the processing jig fixed portion, and damage to the housing 13 at the root of the processing jig fixed portion is suppressed. Therefore, the range of steel plates that can be drilled is expanded without increasing the height of the housing 13.

Further, by inclining, the length of the usable airbag 41 is reduced as compared with the case where the airbag 41 is parallel to the axis 11, but the diameter of the airbag can be increased to increase its volume. That is, since the airbag 41 having a large volume capable of coping with a large volume variation of the chamber can be adopted, it is possible to lengthen the stroke of the piston 17.

Thus, in this invention, the housing 13 and the cylinder 14 are
The strength of the root 13b of the processing jig fixing portion is reinforced without increasing the size of the.

Further, while the mounting hole 40 separates from the root 13b, the mounting hole 40 approaches the axis 11 as it approaches the cylinder 14. Therefore, the housing flange 53 and the cylinder flange 54
However, the thickness of the outer edge can be omitted at the portion indicated by the alternate long and short dash line, and the cylinder 14 and the housing 13 can be made compact and lightweight.

The airbag 41 is housed in the mounting hole 40 as follows, for example.

First, the nut 42 is inserted into the airbag 41. Then, the bolt 48 is inserted through the washer 46, and the bolt 41 is screwed into the nut 42 in the airbag, so that the airbag 41 is mounted in the mounting hole 40. The bolt 48 has a center hole 48a penetrating therethrough, and the inside of the airbag is opened to the atmosphere by this through hole. Install filter 50 on the outside of bolt 48 to prevent dust from entering.
It is good to attach to.

Although the mounting hole 40 is formed to have the step portion 40a in the embodiment, it may have another shape.

Generally, a portable hydraulic processing machine has a considerable weight even though it is portable, so that the housing has a flat end.
During the machining process, it is often the case that the flat portion is erected on the ground or the like and temporarily held. In the known configuration,
The mounting hole opens in this flat portion. Therefore, dirt and dust are easily attached to and mixed with the opening of the mounting hole, and there is a risk that the filter in the mounting hole will be blocked and communication between the air bag and the atmosphere will be blocked. If the communication between the air bag and the atmosphere is hindered, it becomes difficult for the air bag to quickly inflate and contract, which hinders the smooth reciprocation of the piston. Moreover, if dirt or dust is mixed in the airbag, the airbag is easily damaged.

On the other hand, in this invention, since the mounting hole 40 is provided so as to be inclined, the opening 40 of the mounting hole is
a can be set so as to avoid the flat portion 13c at the tip of the housing.
With this configuration, even if the flat portion is erected on the ground or the like and temporarily held, the opening 40a of the mounting hole does not directly contact the ground or the like, so that adhesion and mixing of dirt and dust is prevented. Therefore, communication between the air bag 41 and the atmosphere is ensured, and there is no fear of making the piston immovable. In addition, damage to the airbag 41 is prevented.

The embodiments described above are intended to explain the present invention, and do not limit the present invention in any way, and all modifications and alterations within the technical scope of the present invention are included in the present invention. Needless to say.

In the embodiment, the portable hydraulic processing machine 10 is embodied as an electric puncher using the punch 22 and the die 30 as a processing jig, but is not limited to the electric puncher and may be embodied as a cutter, a bender, or the like. .

[Effect of device]

As described above, in the portable hydraulic processing machine according to the present invention, the mounting hole of the airbag is formed in the housing by opening in the front end surface of the housing and being inclined toward the axis as it separates from the front end of the housing. There is. Therefore, the mounting hole can be set apart from the root of the machining jig fixed part, the required thickness can be obtained between the root of the machining jig fixed part and the mounting hole, and the strength of the root can be reinforced, The required strength can be secured. And, without increasing the height of the housing, the root withstands the bending moment at the time of machining and prevents the bending of the machining jig fixing part,
Damage to the housing near the root is suppressed.

Inclining reduces the usable length of the airbag compared to when parallel to the axis, but allows the airbag to have a larger diameter and a larger volume. That is, since a large volume airbag capable of coping with a large volume variation of the chamber can be adopted, the stroke of the piston can be lengthened.

Further, since the mounting hole is separated from the root, the mounting hole is closer to the center as it gets closer to the cylinder, so that the flanges of the housing and the outer edge of the flange of the cylinder can be omitted, respectively, and the cylinder and the housing can be reduced in size and weight.

Further, since the mounting hole is provided so as to be inclined, the opening of the mounting hole can be set so as to avoid the flat portion at the tip of the housing. In this configuration, even if the flat portion is erected on the ground or the like and temporarily held, the opening of the mounting hole does not directly contact the ground,
Prevents dirt and dust from adhering and mixing. Therefore, communication between the air bag and the atmosphere is ensured, there is no risk of immobilizing the piston, and damage to the air bag is prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a portable hydraulic processing machine according to the present invention. 10: Portable hydraulic machine, 11: Axis, 12: Main body, 13: Housing, 14: Cylinder, 14a, 14b: Cylinder chamber, 15:
Pump case, 16: Motor housing, 17: Piston, 2
2: Punch (processing jig), 23: Piston head, 24: Return spring, 26: Return valve, 29: Relief valve, 30:
Dice (processing jig), 31: flow path, 32: notch, 34: reservoir, 36: connecting path, 40: airbag mounting hole, 41: airbag, 42: nut, 48: bolt, 50: filter , 53: Housing flange, 54: Cylinder flange.

Claims (2)

[Scope of utility model registration request] 1. A machining jig at the tip of the piston and another machining jig at the tip of the housing by pressurizing oil in a reservoir provided in a housing adjacent to the cylinder and supplying the pressurized oil to advance the piston in the cylinder. In a portable hydraulic processing machine that performs the desired machining with and compensates for the volume fluctuation of the cylinder chamber due to the reciprocating movement of the piston by the expansion and contraction of the flexible airbag inside the housing, the air that communicates with the reservoir A portable hydraulic processing machine, wherein a mounting hole of the bag is formed in the housing so as to open at a front end surface of the housing and be inclined in a direction approaching an axis as it separates from the front end of the housing. 2. A processing jig at the tip of the piston and another processing jig at the tip of the housing by pressurizing oil in a reservoir provided in a housing adjacent to the cylinder and supplying the pressurized oil to advance the piston in the cylinder. In the portable hydraulic processing machine, which performs desired machining by means of and compensates for the volume change of the chamber of the cylinder due to the reciprocating movement of the piston by the expansion and contraction of the flexible airbag in the housing, communicates with the reservoir. The mounting hole of the airbag is opened in the housing front end surface at a position avoiding the flat portion of the housing front end surface, and is formed in the housing so as to incline toward the axis as it separates from the housing front end. Portable hydraulic processing machine.