JPS636866Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a compression head of a hydraulic compression device used for connecting electric wires in distribution line construction and the like. The hydraulic compression device has ground equipment such as an electric hydraulic pump device and a portable generator, and a compression head that is carried to a work location such as on a pole. The compression head is connected to the compressor by a hydraulic hose, and is connected to the hydraulic pump device by a lead wire so that a switch for controlling the electric motor and solenoid valve in the hydraulic pump device can be carried along with the compression head and remotely controlled. In the conventional compression head of such a device, a piston that operates a movable die facing a fixed die moves forward by oil supplied from a hydraulic pump device, and moves back by the repulsive force of a spring provided in the piston portion. The compression head is operated based on the operation of a switch.

In other words, by operating a switch, an electric motor powered by a portable generator is operated to operate a hydraulic pump device, and a solenoid valve of the hydraulic pump device is actuated to form an oil feed path, and the oil is sent from the hydraulic pump device via a hydraulic hose. It sends oil to the compression head and operates its piston. In this case, compression due to piston operation progresses, and when the hydraulic pressure at the time of compression crimping reaches a predetermined pressure, the pressure switch provided in the hydraulic pump device operates to stop the electric motor, and the piston stops due to the accompanying stoppage of oil supply. It's getting old. After that, operate the switch again to activate the solenoid valve, this time to form an oil return path, and the repulsive force of the spring in the piston will return the piston to its original position, and the oil in the cylinder will flow through the hydraulic hose. It is designed to be returned to the hydraulic pump device via the pump.

Therefore, in conventional compression heads, the forward and backward movements of the piston are performed based on the oil feed path and oil return path that are formed by controlling a solenoid valve by operating a switch. In order to stop the movable die midway through the crimping work for connecting electric wires, the electric motor of the hydraulic pump device must be stopped by operating a switch. To connect wires to each other by crimping, each wire is inserted from both ends into a short cylindrical inclusion with a C-shaped cross section, that is, a C-shaped connector, and the wires are overlapped within the C-shaped connector. In this case, from the viewpoint of workability, a method is adopted in which the C-type connector is clamped and fixed to both dies of the compression head, that is, temporarily fixed, and then each wire is inserted and crimped. ing. However, in the conventional compression head, in order to clamp and fix the C-type connector to both dies in advance, the running electric motor must be temporarily stopped midway through the process, resulting in poor workability and inefficiency. Furthermore, the electric motor stops when the power is turned off by operating a switch. There is oil delivery to the compression head due to rotation, which creates a situation where the piston does not stop immediately. As a result, during the temporary fixing work, the piston moves beyond the stroke required to clamp and fix the C-type connector between the two dies, causing problems such as abnormal deformation of the C-type connector or pushing and immersion.
The temporary fixing work could not be carried out smoothly.

In view of the above-mentioned problem, the object of this invention is to provide a compression head that can smoothly perform temporary fixing work.

This invention will be explained below based on drawings showing one embodiment of the invention.

1 is a cylindrical body, 2 is a cylinder integrally and continuously formed with the body 1 and has one end open, 3 is a piston, 4 is a piston rod, and 5 is a frame, the base of which fits into the open end of cylinder 2. A fixed part 5a, a cylinder 2 in which the piston rod 4 fits and forms a piston stop.
It has a portion 5b with a smaller inner diameter, and an exit opening 6 for the piston rod 4 is provided in the portion 5b. Reference numeral 7 denotes a piston return spring that is fitted onto the piston rod 4.

The body 1 is formed with a feed path 9 extending in the axial direction from an oil feed port 8 at the end of the body and communicating into the cylinder 2, and the oil feed port 8 has an oil feed hose 10 connected to a hydraulic pump device. They are connected by a joint 11.

A small-diameter return path 13 is formed in the body 1 by the feed path 9 that branches from the middle part of the feed path 9 and reaches a return port 12 at the end of the body.
There is a return hose 14 connected to the hydraulic pump device.
are connected by a joint 15.

The return path 13 is a portion 13a orthogonal to the feed path 9.
It has a 〓-shaped part 13b which is parallel to , and a part of the orthogonal part 13a is a small diameter part 13c with a reduced diameter.

Reference numeral 16 indicates a piston-type valve that opens and closes the return passage 13. The valve 16 is slidably fitted into a cylinder hole 17 formed in the body 1, and its lower end is connected to the return passage 1.
Piston part 1 facing parallel part 13b of 3
6a, orthogonal portion 13a of the return path 13 on the feed path 9 side
A ball-shaped valve body 16b, which is larger in diameter than the small diameter portion 13c, is loosely fitted into the small diameter portion 13c of the return path 13, and is arranged between the lower end of the piston portion 16a and the valve body 16b.
It consists of a connecting rod 16c and a pin portion 16d. This piston-type valve 16 is always connected to the return path 13 by the spring 18.
The small diameter portion 13b of the pin portion 16d is closed and protrudes outward from the body.

Reference numeral 19 denotes a lever disposed on the pin portion 16d of the valve 16, which is pivotally supported by a support piece 20 provided on the outer surface of the body, and when the lever 19 is operated against the spring 18 toward the body shown by the arrow, the lever side presses the pin portion 16d and the valve 16 is pushed. As a result, the small diameter portion 13 of the return path 13 due to the valve body 16
c is unblocked, and the feed path 9 and return path 13 communicate with each other. 21 is a spring for returning the lever. 2
2 is a cylindrical grip portion that fits and secures to the end of the body; 23;
is a switch provided on the gripping portion 22, and this switch 23 communicates with the electric motor of the hydraulic pump device through a cord 24 to control (operate, stop) the electric motor.

25 is a protection tube, a is a movable die, and b is a fixed die.

In the compression head of this invention, an electric motor in a hydraulic pump device is operated by operating a switch 23, and oil is sent from the hydraulic pump device through an oil feed hose 10 and into a cylinder 2 through a feed path 9 of a body 1. During the operation of the piston 3, if the lever 19 is operated against the spring 18 toward the body shown by the arrow, the side surface of the lever presses the pin portion 16d of the valve 16, and the valve 16 is pressed. The small-diameter portion 13c of the return path 13 is unblocked by the valve body 16b, and the feed path 13 is opened to communication, and part of the oil flowing through the feed path 10 flows into the return path 13 and is used for return. Since it is returned to the hydraulic pump device via the hose 14, it will stop.

When the lever 19 is released, the valve 16 returns to its original state due to the repulsive force of the spring 18, and the valve body 16b closes the small-diameter portion 13c of the return path 13, causing the hydraulic pump device to send water from the hydraulic pump device to the feed path 9. The oil contained in the cylinder 2 enters the cylinder 2, and the operation of the piston 3 is restarted.

Therefore, according to this compression head, when the C-shaped connector is clamped and fixed to the movable die and the fixed die during the temporary fixing operation, the movable die will immediately stop if the piston type valve installed in the body is pushed. Therefore, it is possible to easily temporarily fasten the C-type connector without causing damage such as deformation or crushing.

This temporary fixing work can be carried out while the electric motor of the hydraulic pump device is running without stopping and oil is being continuously supplied to the compression head, so it is very easy to work and efficient.

[Brief explanation of drawings]

The attached drawings show one embodiment of this invention, and the first
The figure is a plan view, the second figure is a partially cutaway sectional view, and the third figure is a partially cutaway sectional view.
The figure is a partially enlarged sectional view of a piston-type valve device portion. 1...Body, 2...Cylinder, 3...Piston, 4...Piston rod, 5...Frame, 7
... Spring for piston return, 8 ... Oil supply port, 9 ... Feeding path, 12 ... Return port, 13 ... Return path, 16 ... Piston type valve, 16a ... Piston part of piston type valve, 16b...Ball type valve body of piston type valve, 18...Spring, 19...
lever.

Claims (1)

[Scope of utility model registration request] The cylinder 2 is passed through the feed path 9 provided in the body 1.
A movable die a is detachably attached to a piston rod 4 of a piston 3, which is moved forward by the hydraulic pressure based on the oil supply and returned by the repulsive force of a spring 7 disposed in the cylinder 2. This is a compression head in which a fixed die b facing a movable die a is removably attached to a frame 5, and a return path 13 branching from a feed path 9 is formed in the body 1, and a return path 13 is always connected to the return path 13. A piston type in which a valve body 16b that is in contact with a spring 18 and closes a return passage 13 is provided so as to be freely pushable, and the return passage 13 is opened by pushing the valve body 16b against the spring 18. A compression head in a hydraulic compression device for electrical wire connection, characterized in that it is equipped with a valve 16.