JP3011599B2 - Removal method of foreign matter inside the pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing foreign matter in a pipe such as a heat radiating pipe or a wire condenser used in a refrigerator.

[0002]

2. Description of the Related Art Recently, it has become necessary to use an alternative fluorocarbon instead of a specific fluorocarbon conventionally used for environmental measures. However, since the alternative Freon is more likely to cause a chemical reaction than the specific Freon, it is necessary to completely remove foreign substances such as chips and chips inside the pipe of the refrigerator through which the alternative Freon flows in order to prevent this chemical reaction.

Conventionally, there has been proposed a pipe end forming apparatus which removes foreign matter from the inside of a pipe by blasting air from a punch when flaring the end of the pipe. -196322). In this method, when one end of a pipe is expanded by a punch, air is injected from the punch into the pipe to blow foreign matter from the other end.

[0004]

However, since the pipe end forming apparatus described above forms only one end of the pipe, when processing both ends of the pipe, one end of the pipe is required. After removal from the device, it is necessary to attach the other end to the device, resulting in a problem that the operation becomes complicated.

[0005] In view of the above problems, the present invention proposes a method for removing foreign matter inside a pipe, which can easily form both ends of the pipe and completely remove foreign matter inside the pipe.

[0006]

According to a first aspect of the present invention, there is provided a method for removing foreign matter inside a pipe, comprising: using two punches for injecting air for removing foreign matter inside the pipe while forming an end of the pipe; Injecting air into the pipe when forming one end of the pipe with the first punch,
The second punch is used to form the other end of the pipe. At this time, air is injected into the pipe and the first
The punch or the second punch.
To form one end of the pipe and blow air into the pipe.
While firing, connect the other end of the pipe with the other punch
It is closed once and then opened.

[0007]

The method for removing foreign matter inside a pipe according to claim 1 will be described.

[0008] One end of the pipe is formed by the first punch. At this time, air is ejected from the first punch to blow off foreign matter inside the pipe from the other end.

Thereafter, the other end of the pipe is formed by the second punch. At this time, air is injected from the second punch into the inside of the pipe, and foreign matter is blown off from the one end.

[0010] Further , while one end of the pipe is formed by one of the first punch and the second punch to inject air into the pipe, the other end of the pipe is connected to the other end. Closed by punch and then released.

Thus, while the other end of the pipe is closed, the pressure inside the pipe increases due to the injection of air from one punch. Then, when the other punch is separated from the other end of the pipe, the foreign matter is blown off from the other end of the pipe at a high speed by the pressure.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a pipe end forming apparatus 1 according to this embodiment.
FIG.

Reference numeral 12 denotes a first punch moving device.

Reference numeral 14 denotes a first fixed base of the first punch moving device. A pair of rails 16 are provided on the upper surface of the first fixed base 14, and the first unit 1
8 are provided. The first unit 18 is movable in the front-rear direction on the rail 16 by the first air cylinder 20, and stops at the initial position and the position where the stopper 21 is provided. Here, the initial position is the first unit 1
Reference numeral 8 denotes the most retreated position on the rail 16. When the first unit 18 stops at the position of the stopper 21, a first stop signal is output from the stopper 21. Stopper 2
The position of 1 is determined by the length of the pipe P to be formed.

Reference numeral 22 denotes a first punch provided on the upper surface of the first unit 18. The first punch 22 is slid in the front-rear direction by a first actuator 24 similarly provided on the upper surface of the first unit 18.

As shown in FIGS. 2 and 3, the first punch 22 includes a body 26 and a molded portion 28 protruding from the front surface thereof, and is fixed by bolts 27a. The body 26 is attached to the first actuator 24 via an attachment 27.

The tip part 28 of the forming part 28 of the first punch 22
a is formed in a hemispherical shape so that the end of the pipe P can be expanded and flared, and the outer diameter 8 of the hemisphere (the tip 2
8a) is slightly smaller than the inner diameter of the pipe P to be formed. Also, the mounting portion 27, the trunk portion 26,
An air flow passage 30 is provided through the molded part 28, and its front end is open at the front end of the molded part 28. The diameter of the air circulation part 30 in the molding part 28 is the
6 is smaller than the diameter. The portion 30a where the diameter of the air circulating portion 30 changes is formed in a tapered shape of 50 ° to 60 ° in the longitudinal direction in order to reduce pressure loss. The ratio of the diameter of the air flow passage 30 in the forming section 28 to the diameter of the tip 28a of the forming section 28 is set to about 45%. This is because the larger the air flow passage 30 is, the larger the air injection amount is, but the strength of the molding portion 28 is weak.
It was about 5%.

Reference numeral 32 denotes a first clamp provided on the upper surface of the first unit 18 in front of the first punch 22. The first clamp 32 fixes the pipe P. When the stopper 39 is provided, the first clamp 32
Stop tightening. Then, the first clamp stop signal is output from the stopper 39.

Reference numeral 34 denotes a second punch moving device.
This device 34 is also provided with a second fixed base 36, a rail 38, and a second unit 40. This second unit 40
Is movable by a second air cylinder 42,
It stops at the initial position and the position where the stopper 41 is provided. When the second unit 40 stops at the position of the stopper 41, a second stop signal is output from the stopper 41. A second punch 44 is provided on the upper surface of the second unit 40 and is movable by a second actuator 46. The structure of the second punch 44 is the same as that of the first punch 22. A second clamp 48 for fixing the pipe P is provided in front of the second punch 44. The second clamp 48 stops the tightening of the pipe P at the position where the stopper 49 is provided. Then, the second clamp stop signal is output from the stopper 49.

An air tank 50 is supplied with air from a compressor via a pressure intensifier 52.

Reference numeral 54 denotes a mist separator for removing dust and oil from the air supplied from the air tank 50 and supplying purified air.

Reference numerals 56 and 58 denote mist separators 54.
A first solenoid valve and a second solenoid valve connected to the first solenoid valve. Then, air sent through the air tank 50 and the mist separator 54 is supplied from the first solenoid valve 56 to the first punch 22 and from the second solenoid valve 58 to the second punch 44, respectively.

Reference numeral 60 denotes a control device of the pipe end forming device 10. As shown in FIG. 4, the control device 60 includes a first air cylinder 20 and a second air cylinder 4.
2, first actuator 24, second actuator 4
6, the first solenoid valve 56, the second solenoid valve 58, the stopper 21,
39, 41, and 49 are connected, and the pipe end forming device 10 can be controlled by an operation unit provided in the control device 60.

A method of forming a pipe P and removing foreign matter therein will be described with reference to a time chart of FIG.

The start button on the operation unit of the control device 60 is turned on.

First unit 18 and second unit 4
0 starts moving forward at the same time. Stopper 2 when both stop
The first and second stop signals are output from the control units 1 and 41 to the control device 60.

Both ends of a pipe P (wire condenser) used in a refrigerator are attached to a first clamp 32 and a second clamp 48, respectively. Both stop after tightening the pipe P. Then, the first and second clamp stop signals are output from the stoppers 39 and 49 to the control device 60.

The first punch 22 is slid to open one end of the pipe P. Then, air is injected from the first punch 22 to remove foreign matter inside the pipe P. At the same time, the second punch 44 is inserted into the other end of the pipe P,
The other end of the pipe P is closed to increase the pressure inside the pipe P. If the second punch 44 is detached from the other end of the pipe P when the pressure inside the pipe P increases, foreign matter is blown off from the other end of the pipe P by the high pressure in the pipe.

Injection of air from the first punch 22 is continued for a certain period of time to remove foreign substances and stop the operation.

The second punch 44 is inserted again into the other end of the pipe P, and is expanded. At that time, the second punch 4
Inject air from 4. In this case, since the first punch 22 is still inserted into one end of the pipe P, the pressure inside the pipe P increases again. At this time, the first punch 22
When the pipe P is removed, foreign matter inside the pipe P is blown off from one end of the pipe P by the increased pressure.

After removing foreign matter by blowing air from the second punch 44 for a certain time, the injection of air is stopped, and the second punch 44 is separated from the other end of the pipe P.

First clamp 32 and second clamp 4
8, the pipe P is removed, and the first unit 18 and the second unit 40 are retracted to the initial positions.

As described above, both ends of the pipe P can be flared without bothering the operator, and foreign matter in the pipe can be completely removed.

[0035]

According to the first aspect of the present invention, both ends of the pipe can be formed at the same time, and foreign matters inside the pipe can be completely removed.

Also, when air is being injected from one punch, the other end of the pipe is closed with the other punch to increase the internal pressure, and then the other punch is removed.
Foreign matter can be completely removed by high pressure.

[Brief description of the drawings]

FIG. 1 is an overall view of a pipe end forming apparatus showing an embodiment of the present invention.

FIG. 2 is a perspective view of a punch.

FIG. 3 is a vertical sectional view of a punch.

FIG. 4 is a block diagram of a pipe end forming apparatus.

FIG. 5 is a time chart showing an operation state of the pipe end forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pipe end forming device 12 1st punch moving device 22 1st punch 28 Forming part 30 Air flow path 34 2nd punch moving device 44 2nd punch 60 Control device

Claims (1)

(57) [Claims] The present invention uses two punches for injecting air for removing foreign matter from the inside of a pipe while forming an end of the pipe, and into the inside of the pipe when forming one end of the pipe by the first punch. injecting air, then the the second punch performs molding of the other end of the pipe, the air injected into the pipe interior At that time, the first punch or either of the second punch
The punch is used to form one end of the pipe and
While injecting air into the section, connect the other end of the pipe to the other port.
A method for removing foreign matter inside a pipe, wherein the foreign matter is once closed by a punch and then opened .