KR101494648B1 - Pipe expanding device - Google Patents

Abstract

The present invention relates to a pipe expanding apparatus capable of minimizing deformation of a workpiece while reducing processing errors.
The pipe expanding apparatus of the present invention includes: a fixing unit for fixing a pipe to be expanded; Expanding means for expanding the inner diameter of the pipe to a predetermined diameter and length by linearly moving toward the pipe front end portion fixed to the fixing portion; An oil supply unit for supplying oil to the inside of the pipe to reduce thermal deformation of the pipe that is expanded when the expansion means is driven; And a control unit for controlling the driving of the expansion means and the oil supply unit.

Description

PIPE EXPANDING DEVICE

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pipe expansion pipe system, and more particularly, to a pipe expansion pipe system capable of minimizing deformation of a pipe while reducing machining errors.

Generally, household appliances such as refrigerators, air conditioners and water purifiers are provided with refrigeration cycles for cooling. In a refrigerating cycle of a conventional household appliance, the compressor and the condenser are connected to each other through a connecting pipe, the condenser and the evaporator are connected to the capillary through the refrigerant supply pipe, and the evaporator and the compressor are connected to the suction pipe.

The refrigeration cycle includes a compressor for compressing gaseous refrigerant at a high temperature and a high pressure, a condenser for condensing high-temperature and high-pressure refrigerant gas discharged from the compressor, and a low-temperature and low-pressure liquid refrigerant passing through the condenser through the capillary And an evaporator that absorbs the latent heat of evaporation and performs a cooling function.

In this refrigeration cycle, the refrigerant is circulated from the evaporator to the evaporator through the condenser and the capillary tube by driving the compressor.

The connection pipe, the refrigerant supply pipe, the capillary pipe, the suction pipe, and the like provided in the refrigeration cycle are made of a copper pipe or the like. In order to facilitate connection, one end of the pipe is inserted into another pipe Welded to each other.

At this time, the inner diameter of the coolant supply pipe is made larger than the outer diameter of the connection pipe, and the outer diameter of the capillary is made smaller than the inner diameter of the connection pipe.

As a prior art for expanding the pipe in this way, there is known a pipe pipe expansion device of the patent document 10-2009-0012574.

In the prior art, when the copper pipe is seated on the first fixing part provided with the magnet sensor, the second fixing part is driven to come into contact with the first fixing part. At this time, the magnet sensor operates to move the conveying part forward by a certain distance, The diameter of the pipe is to be determined.

Then, when the front contact rod installed on one side of the transfer part comes into contact with the front contact sensor, the movement of the transfer part stops and then moves backward, and the rear contact bar contacts the rear contact sensor The second fixing portion is separated from the first fixing portion, and one copper pipe expanding operation is completed.

However, in this prior art, when the conveying unit moves forward due to the signal of the magnet sensor, the pipe is started to be expanded, and when the contact rod of the conveying unit contacts the contact sensor, the pipe is stopped and the conveying unit is retracted. If the pipe length is determined by the sensing of the sensor, there is a disadvantage that the pipe length of the pipe is not formed to an accurate length.

That is, the sensor may be incorrectly sensed due to the noise and vibration generated when the expansion pipe is driven, and various pollutants such as dust and oil stick to the sensor, Since the precise control is not possible, the pipe length of the pipe can be changed without being constant.

In the case of anterior cusps, the pipe may be torn or deformed due to the friction of the pipe when the pipe is inserted inside the pipe.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a pipe expanding apparatus which can prevent a workpiece from being deformed while reducing machining errors.

The pipe expansion system proposed by the present invention includes a fixing unit for fixing a pipe to be expanded; Expanding means for expanding the inner diameter of the pipe to a predetermined diameter and length by linearly moving toward the pipe front end portion fixed to the fixing portion; An oil supply unit for supplying oil to the inside of the pipe to prevent thermal deformation of the pipe that is expanded when the expansion unit is driven; And a control unit for controlling the driving of the expansion means and the oil supply unit.

The fixed portion is composed of a fixed clamp and a movable clamp, and the movable clamp is provided with a cylinder for moving the movable clamp toward the fixed clamp to fix the pipe.

A stopper is provided between the fixing unit and the expanding means so as to position the distal end of the pipe to be expanded at a predetermined position.

The sprinkler of claim 1, wherein the expanding means comprises a cylinder, a slider which linearly moves along the conveying guide by driving the cylinder, a spindle which is installed on the casing and rotates by receiving the rotational force of the motor, And an expanding shaft which enters the inside of the pipe to expand the inside diameter of the pipe.

The expansion shaft is configured to expand the pipe while rotating together with the spindle, and the oil pipe is installed in the spindle and the expansion shaft so that the oil of the oil supply unit can be supplied into the expanded pipe.

A stopper is provided for restricting the movement of the cylinder so as to prevent the expansion shaft from advancing beyond a predetermined length.

The oil supply unit includes an oil storage tank, an oil supply valve for discharging the oil in the oil storage tank to a predetermined pressure, a conduit for guiding the oil supplied from the oil supply valve to the expansion means, And an oil control valve for controlling the amount of oil.

The expanding means is advanced by a predetermined time in the direction in which the pipe is fixed by the control unit to retract the pipe after enlarging the pipe.

The pipe expansion system is configured to expand one or more pipes at a time, and the pipe expansion system is operated by operation of a movable switch.

The pipe extension system is further provided with an emergency stop switch that can be used to stop the equipment during operation.

According to the present invention, since the stopper installed in the control and expansion means of the control unit interlocks with each other and performs the expansion work, the pipe can be always expanded to the correct length.

In addition, since the oil is injected into the pipe through the oil injector when the pipe is expanded, the coefficient of friction of the pipe to be expanded is minimized, so that breakage and thermal deformation of the pipe can be prevented.

1 is a front view of a pipe-expanding apparatus according to the present invention.
2 is a plan view of a pipe-expanding apparatus according to the present invention.
3 is a side view of a pipe-expanding system according to the present invention.
FIG. 4 is a view for explaining a fixing part provided in a pipe expansion pipe according to the present invention. FIG.
FIG. 5 is a view for explaining an expanding means provided in the pipe expanding apparatus according to the present invention. FIG.
6 is a view for explaining that oil is injected into a pipe when the pipe is expanded using the pipe expansion pipe according to the present invention.

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

FIGS. 1 to 3 are views showing the pipe expanding apparatus according to the present invention in a front view, a plan view, and a side view, FIGS. 4 and 5 are views for explaining a fixing unit and an expanding means provided in the pipe expanding apparatus of the present invention, 6 is a view for explaining that oil is injected into the pipe when the pipe is expanded.

As shown in the drawings, the pipe expanding apparatus according to the present invention includes a fixing unit 2 for fixing a pipe P to be expanded, a pipe 2 for linearly moving toward the front end of the pipe P fixed to the fixing unit 2, And an oil supply part (4) for supplying oil to the inside of the pipe to reduce the thermal deformation of the pipe (P) which is expanded when the expansion means (4) is driven 6 and a control unit 8 for controlling the driving of the expansion means 4 and the oil supply unit 6. [

The fixing portion 2, the expansion means 4, the oil supply portion 6 and the control portion 8 are fixed to the frame 10 or are drivably installed.

The frame 10 is provided with a movable switch SW1 for actuating the expansion pipe and an emergency stop switch SW2 for emergency stop when the expansion pipe is in operation.

The fixing part 2 includes a fixed clamp 2a fixed to the frame 10 by a fixing member made of a bolt and a nut and the movable clamp 2b positioned in a direction parallel to the fixed clamp 2a, And a cylinder not shown is connected to the movable clamp 2b so that the movable clamp 2b can be moved or retracted toward the fixed clamp 2a to fix or unlock the pipe P therebetween .

In this embodiment, the fixing part 2 is provided with two movable clamps 2b on both sides of the fixed clamp 2a so that two pipes P can be fixed at one time to perform the expansion work. However, the fixing part 2 And the expanding means 4 can be constructed so that one or two or more pipes can be simultaneously fixed and expanded.

The stationary clamp 2a may further include a guide portion for allowing the pipe P to be stably installed.

A stopper 12 is provided between the fixing portion 2 and the expanding means 4 so that the front end of the pipe P to be expanded can always be positioned at a predetermined position.

The stopper 12 is linearly reciprocated in a vertical direction by the driving force of the driving unit 14.

That is, the stopper 12 is positioned in an elevated state by the driving force of the driving unit 14 in the initial state. In this state, when the pipe P is pushed to the fixing part 2 and forward, The movable clamp 2b moves toward the stationary clamp 2a and fixes the pipe P. When the movable clamp SW1 is pressed at this time,

At the same time, the stopper 12 is lowered by the driving force of the driving unit 14 so that the expansion pipe 4 moves toward the pipe P and can perform the expansion work.

The expanding means 4 includes a cylinder 16 for generating a driving force, a slider 20 for linearly reciprocating along the conveying guide 18 by the driving force of the cylinder 16, A spindle 26 which is rotated by receiving the rotational force of the motor 24 and is fixed to the distal end of the spindle 26 and inserted into the distal end of the pipe P while being advanced by driving the cylinder 16, And an expanding shaft 28 which expands.

The cylinder 16 may generate a driving force by hydraulic pressure or pneumatic pressure. Such a cylinder may be of a type commonly used in a mechanical device or the like, and thus a detailed description thereof will be omitted.

In addition, the cylinder 16 is provided with a stopper 30 so that the moving distance of the cylinder can be kept constant. The movement distance of the expanding means 4 is kept constant by the stopper 30. The stopper 30 restricts the moving distance of the expanding means 4 by sensing a sensing sensor (not shown) provided on the frame 10 or the like.

Accordingly, the expanding means 4 including the expanding shaft 28 advances by a predetermined distance to expand the pipe P, so that the expanded length of the pipe P can be made constant.

The element for determining the expansion length of the pipe P in this way is determined to move the expansion means 4 for a predetermined time by the control of the control unit 8, which will be described later in detail along with the movement distance of the expansion means 4. [

A pair of sensing sensors 32 are installed around the cylinder 16 so as to sense the forward and backward movement of the cylinder 16. A signal sensed by the sensing sensor 32 is transmitted to the controller 8 And controls the oil supply unit 6 under the control of the control unit to supply or stop the supply of oil to the inside of the pipe P to be expanded.

That is, when the advance of the cylinder 16 is detected by the detection sensor 32, the signal is transmitted to the control unit 8 to drive the oil supply unit 6 to supply oil into the pipe P, The control unit 8 stops the operation of the oil supply unit 6 and stops the supply of the oil.

Therefore, when the expanding means 4 advances by the detection of the detection sensor 32 and the expanding operation proceeds, the oil supplying portion 6 supplies the oil. When the expanding operation of the expanding means 4 is completed, Thereby stopping the supply of oil from the oil supply unit 6.

Both ends of the conveying guide 18 are fixed to a fixing bracket 34 fixed to the frame 10. To the slider 20 assembled to the conveying guide 18, Can be provided.

The spindle 26 is rotatably mounted in the center of the casing 22 and a pulley is provided on one side of the spindle 26 and on the rotary shaft of the motor 24 and a belt 36 is wound around the pulley, So that the spindle 26 can rotate.

The widening shaft 28 is fixed to the spindle 26 and the fixing chuck 38 so that when the spindle 26 rotates, the widening shaft 28 also rotates. It is preferable that the distal end portion of the widening shaft 28 be sharp.

In addition, the spindle 26 and the expansion shaft 28 are formed so that the oil passages 40 pass through the inside of the spindle 26, and the oil of the oil supply unit 6 can be supplied into the pipe P through which the oil is expanded.

The frictional resistance between the expansion shaft 28 and the pipe P is minimized when the pipe P is expanded to prevent the pipe P from being torn or deformed due to heat.

The oil supply portion 6 for supplying the oil to the inside of the pipe when the pipe is extended as described above includes an oil storage tank 42 and an oil supply valve 44 for discharging the oil of the oil storage tank 42 to a predetermined pressure. A conduit 46 for guiding the oil discharged from the oil supply valve 44 to the expansion means 4 and an oil control valve 48 for regulating the amount of oil discharged to the conduit 46 .

The oil stored in the oil storage tank (42) is an oil capable of sufficiently reducing frictional resistance and capable of cooling.

The channel (46) can be made flexible in the length of the expanding means (4).

The conduit 46 and the spindle 26 are connected to the rotary valve 50 mounted on the spindle so that the conduit 46 does not rotate even if the spindle 26 rotates, ). ≪ / RTI >

The oil supply valve 44 can supply compressed air having a predetermined pressure to the oil by an unillustrated apparatus to supply the oil to the expanding means 4.

The oil supply valve 44 may be a solenoid valve or the like that automatically opens and closes the valve by the electromagnetic force of the electromagnetic coil. The oil supply valve 44 is electrically connected to the control unit 8, As shown in Fig.

The control unit 8 includes a power switch for turning on / off the entire power source of the expansion pipe system and a time control unit for advancing the pipe P toward the pipe P fixed to the fixing unit 2 in order to expand the pipe P. [ And a control panel for controlling the driving of the oil supply unit 6 are provided.

The length of the pipe P can be adjusted by adjusting the time for the expanding means 4 to expand the pipe P by operating the control panel of the control unit 8.

If the expansion process is performed by setting the expansion processing time of the pipe P in the control unit 8 as described above, no error due to the sensor or the like is generated as in the conventional case, so that the expanded length of the pipe P can be always kept constant.

The driving force of the cylinder 16 for moving the expansion means 4 may vary depending on the temperature condition and the like when the expansion time is determined by the control of the control unit 8. In this case, The length of the pipe P to be expanded is not constant, so that a deviation may occur.

If the movement of the expanding means 4 does not reach the position where the stopper 30 is sensed when the cylinder 16 is driven for a predetermined period of time to prevent this, the cylinder 16 continues to operate under the control of the control unit 8 The expanding means 4 advances and retracts until the stopper 30 is sensed by the sensing sensor.

When the stopper 30 is detected by the detection sensor due to the movement of the expansion means 4 before the predetermined time, the cylinder 16 is driven in the reverse direction under the control of the control unit 8 to retract the expansion means 4.

The pipe extension length of the pipe P is determined by the advance operation time of the cylinder 16 or the stopper 30 under the control of the control unit 8. [

In order to expand the pipe by using the pipe expanding apparatus of the present invention as described above, the control unit 8 first turns on the power switch and inputs the advance time of the cylinder 16, that is, the expansion time, by operating the control panel. At this time, the stopper 30 also calculates and adjusts the length of the pipe P to expand.

Then, the pipe P to be expanded is placed on the stationary clamp 2a, and is pushed forward and brought into close contact with the stopper 12. [

When the movable switch SW1 is turned on in this state, the movable clamp 2b moves toward the stationary clamp 2a by driving the cylinder to fix the pipe P. At the same time, the motor 24 of the expanding means 4, The spindle 26 and the expansion shaft 28 are rotated while the motor 24 is driven and the motor 24, the spindle 26 and the expansion shaft 28 integrally move toward the pipe P And the expansion shaft 28 enters the tip of the pipe P, and the pipe P begins to expand.

When the operation of the cylinder 16 is detected by the detection sensor 32, the oil supply valve 44 is operated under the control of the control unit 8 so that the oil in the oil storage tank 42 is supplied to the oil supply valve 44 to the pipe 46, and is then injected into the pipe P through the oil pipe 40. [

As a result, the expansion of the pipe progresses while suppressing frictional resistance and frictional heat due to friction between the expansion shaft 28 and the pipe P.

When the pipe is expanded by a predetermined length while the expansion shaft 28 is inserted into the pipe P for a predetermined time under the control of the control unit 8, the control unit 8 controls the cylinder 16 in the reverse direction And the expanding means 4 is retracted and returns to the home position.

The cylinder 16 continues to operate under the control of the control unit 8 so that the expanding means 4 can stop the stopper 30 when the expanding means 4 does not reach the position where the stopper 30 is operated for a predetermined time, The cylinder 16 is driven in the reverse direction under the control of the control unit 8 and the cylinder 16 is driven in the reverse direction so that the cylinder 16 is opened, The means 4 is retracted.

When the retraction of the cylinder 16 is completed after the expansion of the pipe P is completed, the detection sensor 32 senses it and the movable clamp 2b moves backward by the driving of the cylinder, Releasing it.

Once the pipe is completed, the pipe is taken out of the fixing part (2), and one expansion process is completed. At this time, the movable switch is turned off by the control of the control unit 8. [

When another pipe is fixed to the fixing part 2 in the same manner as described above and the movable switch SW1 is turned on, the enlargement operation is carried out while the long key is driven in the same manner as described above.

While the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

2: fixed part 4: expansion means
6: Oil supply part 8: Control part
10: Frame 12, 30: Stopper
14: driving part 16: cylinder
18: transport guide 20: slider
22: casing 24: motor
26: Spindle 28: Expansion shaft
32: Detection sensor 34: Fixing bracket (34)
36: Belt 38: Fixing chuck
40: Oil pipeline 42: Oil storage tank
44: Oil supply valve 46:
48: Oil control valve 50: Rotary valve

Claims (12)

A fixing part for fixing the pipe to be expanded;
Expanding means for expanding the inner diameter of the pipe to a predetermined diameter and length by linearly moving toward the pipe front end portion fixed to the fixing portion;
An oil supply unit for supplying oil to the inside of the pipe to reduce thermal deformation of the pipe that is expanded when the expansion means is driven;
A control unit for controlling driving of the expansion means and the oil supply unit;
Lt; / RTI >
The sprinkler of claim 1, wherein the expanding means comprises a cylinder, a slider that linearly moves along the conveying guide by driving the cylinder, a spindle which is installed on the casing and rotates by receiving the rotational force of the motor, And a pipe extending from the inside of the pipe to expand the inside diameter of the pipe. The method according to claim 1,
Wherein the fixed portion comprises a fixed clamp and a movable clamp, and the movable clamp is provided with a cylinder for moving the movable clamp toward the fixed clamp to fix the pipe. The method according to claim 1,
Wherein a stopper is provided between the fixing part and the expanding part so that the tip of the pipe to be expanded can be positioned at a predetermined position. delete The method according to claim 1,
And the expansion shaft is configured to expand the pipe while rotating together with the spindle. The method according to claim 1,
Wherein the spindle and the shroud shaft are provided with oil pipes therein so as to supply oil of the oil supply unit to the inside of the pipe to be expanded. The method according to claim 1,
Wherein the cylinder is provided with a stopper for restricting the movement of the cylinder so as to prevent the expansion shaft from advancing beyond a predetermined length. The method according to claim 1,
The oil supply unit includes an oil storage tank, an oil supply valve for discharging the oil in the oil storage tank to a predetermined pressure, a conduit for guiding the oil supplied from the oil supply valve to the expansion means, And an oil control valve for controlling the volume of the pipe. The method according to claim 1,
Wherein the expansion means is advanced by a predetermined time in a direction in which the pipe is fixed by the control of the control unit, so that the pipe is retracted after the pipe is enlarged. The method according to claim 1,
Wherein the pipe expansion pipe is configured to expand one or more pipes at a time. The method according to claim 1,
And the pipe expansion pipe system is operated by operation of a movable switch. The method according to claim 1,
Further comprising an emergency stop switch which is capable of emergency stopping the expansion pipe system while the pipe expansion pipe system is in operation.

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