JP2001150362A - Charge-type crimping tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge-type crimping tool having two kinds of pumping devices of high pressure and low pressure, and capable of executing the compression without applying the excess load to a motor even in main compression after the contact of a rapidly traversed ram for pressure with an article, whereby minimizing the motor and elongating the service life of a battery. SOLUTION: A switching valve V is mounted on an oil feed path 10a to an oil chamber 6a of a low pressure pump, and the oil feeding to the path 10a is released by switching the switching valve by high pressure of a communication path 14 communicated with the oil chamber when high pressure is applied to a back oil chamber of a pressure ram. That is, the low-pressure pump is paused, and only a high-pressure pump is operated, which reduces the power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable compression tool having a built-in battery, and an object thereof is to minimize power consumption during a compression operation.

[0002]

2. Description of the Related Art A battery-operated compression tool is preferably used for wire connection work on a steel tower, and the battery must be replaced with a recharged battery in a timely manner. It is necessary to extend the life of the battery and reduce the frequency of replacement to improve work efficiency, and there is a need for a compression tool that avoids overload to meet this purpose.

[0003] Japanese Patent Application Laid-Open No.
176553 is known. The gist and problems of the present invention will be described with reference to FIG. 3 (circuit diagram) in the present invention. According to the present invention, two ram cylinders 21 and 22 which discharge oil at the same pressure are used. When the dies abut the goods, the hydraulic pressure increases. Predetermined pressure (230kgf / c
When the pressure reaches m2), the valve 16 is switched, and oil supply to the entire rear surface of the piston 12 starts, so that the main compression is performed.

[Problems to be solved by the invention]

[0004] This compression requires great power,
Since only oil discharge of the same pressure can be obtained from both cylinders 21 and 22, it is necessary to incorporate a large-capacity motor in order to enable effective main compression. From this point, the above cited reference has an insufficient power saving effect.

[0005]

In the above-mentioned prior art, two oil pumps are illustrated. However, the oil is discharged at the same pressure, and there is no distinction between high pressure and low pressure. As a result, a large-capacity motor is required.

In contrast, the present invention utilizes two types of pumps, one for low pressure and one for high pressure. The former has a large diameter plunger for extruding oil, and the latter has a small diameter.

In operation, the ram is first fast-forwarded by the operation of both pumps. When the dice (not shown) on the ram comes into contact with the product and the hydraulic pressure starts to rise, a switching valve capable of automatically releasing the suction of oil into the low-pressure pump is provided on the suction side. After the operation of the valve, the oil gradually increases in pressure only by the operation of the small-diameter plunger, so that the motor for driving the plunger may be of a relatively small and small horsepower. As a result, the battery lasts longer.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings will be described with reference to an example in which the above-described two types of low-pressure high-pressure oil pumps are arranged in series. The main body 1 of this compression tool comprises a ram actuating part and a drive part pump device. The ram actuating portion has a ram 2 slidably provided in the main body cylindrical portion, and forms a sealed oil chamber 3 on the back of the ram.

The drive unit drives a pump device described below. The drive unit includes a battery B, a motor M, and a transmission T in this order, and the cam shaft 4 projects from the transmission T. An eccentric disk cam C is fixed to the camshaft and has a ball bearing (not shown) on the outer periphery.

The pump device has a built-in plunger 5.
The plunger 5 includes a large diameter portion 5a and a small diameter portion 5b. It is slidably inserted into the stepped cylinder in the main body with the large diameter part facing upward. An oil chamber 6a is formed on the lower surface of the large diameter portion, and an oil chamber 6b is provided on the lower surface of the small diameter portion. The upper end of the plunger 5 contacts the cam C, and the lower end is supported by a spring S in the small-diameter oil chamber 6b.

The large-diameter oil chamber 6a is connected to the passage 10 as shown in FIG.
a connects to the suction valve 7a in the oil tank O, and flows to the oil chamber 3 via the discharge valve 8a via the passage 10b as shown in FIG. At the lower end of the small diameter oil chamber 6b, as shown in FIG.
The oil sucked from here is pushed into the passage 9a from the other side of the oil chamber 6b, and flows to the oil chamber 3 of the ram via the discharge valve 8b and the passage 9b.

The above-described suction valves 7a, 7b and discharge valve 8
Each of a and 8b is a well-known device which has a valve seat, a ball, and a spring and has a check function. Large-diameter oil chamber 6a is small-diameter oil chamber 6b
The storage space for the oil sucked and discharged by the lifting and lowering of the plunger 5 is larger than that of the plunger 5, so that a low-pressure pump action is performed around the large-diameter oil chamber and a high-pressure pump action is performed around the small-diameter oil chamber.

In the present invention, in addition to the above, a switching valve device V is provided in a passage 10a communicating with the large-diameter oil chamber 6a as shown in FIG. In this device, as shown in FIG. 3, a cylinder perpendicular to the passage 10a is provided in the main body 1, and a piston valve 11 is slidably inserted therein. On one side of the piston valve 11, the pressing valve 12 is pressed by a spring 13, and on the other side, the high-pressure oil flowing in can push the piston valve 11 back by the communication passage 14 from the high-pressure passage 9 b.

Therefore, at the time of rapid traverse, the low-pressure oil flows from the passages 10a to 10b without hindrance. However, when the ram comes into contact with the product and the passage 9b becomes high pressure, the piston valve 1
1 moves, closes the passage from the passage 10a to the passage 10a, stops the oil supply in the oil chamber 6a, and replaces the passage 10b with the passage 1
5 to release and release the low pressure oil. As a result, the oil suction action of the low-pressure pump action is killed, and no load is applied, and only the high-pressure pump action works effectively. As a result, the main compression can be performed by a motor having relatively small horsepower.

The high-pressure safety valve H attached to FIG. 4 operates when the high-pressure compression of the article is completed, and prevents the device from being literally broken due to abnormally high pressure. In this embodiment, the pressure is set to 700 kgf / cm 2. I have. The high-pressure oil is discharged to the passage 16. Also, as shown by the phantom line in FIG. 4, a manual return valve R is provided to release the residual pressure in the cylinder after compression, or to stop the compression work urgently during compression, and press the push button to release the internal pressure. Oil may be returned to the cylinder.

[0016]

Since the main compression can be performed by a small motor, the power consumption is small and the battery can be used continuously for a long time.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a sectional end view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 2;

FIG. 4 is a hydraulic circuit diagram of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Ram 3 Back oil chamber 4 Cam shaft 5 Plunger 5a, 5b Large diameter section Small diameter section 6a, 6b Oil chamber 7a, 7b Suction valve 8a, 8b Discharge valve 9a, 9b Passage 10a, 10b Passage 11 Piston valve 12 Press valve 13 Spring 14 Communication path 15, 16 Path B Battery M Motor T Reduction gear C Disk cam O Oil tank V Switching valve device H High-pressure safety valve R Manual return valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02G 1/14 H02G 1/14 C

Claims (1)

[Claims] A ram slidable ram having a slidable ram inside a cylindrical portion of a part of a main body, a ram operating part having a back surface of the ram as a sealed oil chamber, and a rotary cam from a motor with a battery attached to the main body via a reduction gear. A pair of large and small plungers with different diameters reciprocating in the main body in the same stroke by engaging the cam of the camshaft with the protruding drive shaft allows oil to be sent from the oil tank to the ram back oil chamber via the suction valve. High and low pressure pump device,
A rechargeable compression tool, characterized in that a switching valve device is releasably provided so that a suction valve of a low-pressure pump device is placed in a no-load state on a pump side when an oil chamber on a ram rear reaches a predetermined high pressure.