KR101754113B1

KR101754113B1 - Retapping apparatus

Info

Publication number: KR101754113B1
Application number: KR1020150076474A
Authority: KR
Inventors: 서준혁
Original assignee: 주식회사화신
Priority date: 2015-05-29
Filing date: 2015-05-29
Publication date: 2017-07-06
Also published as: KR20160140180A

Abstract

An invention directed to a re-tapping apparatus is disclosed. A re-tapping apparatus of the present invention comprises: a base plate movably installed on a base; A support table movably installed on the base plate; A motor unit installed on the support; A drive chuck provided on the support and having a drive shaft rotatably coupled to the motor; And a drive shaft which is movably provided along the longitudinal direction of the drive shaft and is engaged with the machining tab, and when the machining tab is rotated with the machining tap engaged with the nut of the chassis frame, And a coupler which is moved from the shaft to the nut side.

Description

[0001] RETAPPING APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a re-tapping device, and more particularly, to a re-tapping device capable of preventing a nut of a chassis frame from being damaged.

Generally, a plurality of nuts are provided in a chassis frame for a vehicle or the like. When paint is applied to the chassis frame, foreign substances such as paint may penetrate the threaded portion of the nut. The re-tapping device includes an air tool driven by air pressure, and a processing tap rotatably coupled to the air tool to remove foreign matter or paint adhering to the nut. The re-tapping device cleans the foreign material attached to the nut while the processing tab is rotated by the air tool.

However, in the related art, the worker approaches the machining tab to the nut of the chassis frame by holding the re-tapping device and re-tapping (cleaning) the nut, so that the threaded portion of the nut may be damaged as the machining tap is shaken by the vibration of the re- have. If the threads of the nut are damaged, the assembly process of the chassis frame may become impossible.

Further, since the worker carries out the re-tapping process while holding the re-tapping device, an injury may occur on the wrist or the waist of the worker. In addition, since the operator manually cleans the nut, the productivity may be lowered when the operator's skill level is low.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Japanese Laid-Open Patent Publication No. 2011-179611 (published on September 15, 2011, entitled "Coating removal bolt and its manufacturing method").

SUMMARY OF THE INVENTION It is an object of the present invention to provide a re-tapping device capable of preventing a nut of a chassis frame from being damaged.

A re-tapping apparatus according to the present invention comprises: a base plate movably installed on a base; A support table movably installed on the base plate; A motor unit installed on the support base; A drive chuck provided on the support and having a drive shaft rotatably coupled to the motor unit; And a machining tap provided on the drive shaft so as to be movable along a longitudinal direction of the drive shaft. When the machining tap is rotated with the machining tap engaged with the nut of the chassis frame, And a coupler which is moved toward the nut side from the drive shaft according to the pulling.

The coupler including: a coupler body coupled to the drive shaft; A moving member coupled to the machining tab and movably coupled to the coupler body along an axial direction of the drive shaft; And an elastic member disposed between the moving member and the coupler body and acting to apply an elastic force to the moving member to move the moving member toward the drive shaft.

A stepped portion is formed in the coupler body, a stepped groove is formed in the movable member so as to be coupled to the stepped portion of the coupler body, one side of the elastic member is supported by the coupler body, And can exert an elastic force to push the moving member toward the drive shaft.

A coupling end is formed on one side of the coupler body to support one side of the elastic member, and a restraining end portion may be formed on the moving member to support the other side of the elastic member.

The movement of the drive shaft can be controlled to be stopped when the machining tab is engaged with the nut.

The motor unit may rotate the drive shaft in a reverse direction when a predetermined time has elapsed after the machining tap is engaged with the nut.

According to the present invention, as the coupler is moved from the drive shaft when the machining tab is rotated while being engaged with the nut, a clearance is generated between the coupler and the drive shaft. Therefore, even if the machining tap is rotated in a state slightly shifted from the rotation axis of the drive shaft It is possible to prevent the nut from being damaged by the machining tap. Furthermore, it is possible to prevent the nut of the chassis frame from being damaged, thereby preventing the assembly process of the chassis frame from being interrupted.

Further, according to the present invention, since the first driving portion, the second driving portion, and the third driving portion re-taps the nut after moving the machining tab, the possibility of injury of the operator is solved and the productivity of the vehicle can be prevented from being lowered .

1 is a side view showing a re-tapping apparatus according to an embodiment of the present invention.
2 is a plan view showing a re-tapping apparatus according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a coupler of a re-tapping apparatus according to an embodiment of the present invention.
4 is a cross-sectional view showing a state in which a machining tab is opposed to a nut in a re-tapping apparatus according to an embodiment of the present invention.
5 is a cross-sectional view showing a state in which a machining tab is engaged with a threaded portion of a nut in a re-tapping apparatus according to an embodiment of the present invention.
6 is a cross-sectional view illustrating a state in which a machining tab is moved along a threaded portion of a nut in a re-tapping apparatus according to an embodiment of the present invention.
7 is a cross-sectional view showing a state in which a machining tab is missing from a threaded portion of a nut in a re-tapping apparatus according to an embodiment of the present invention.

Hereinafter, an embodiment of a re-tapping apparatus according to the present invention will be described with reference to the accompanying drawings. In the course of describing the re-tapping apparatus, the thicknesses of the lines and the sizes of the constituent elements shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a side view showing a re-tapping apparatus according to an embodiment of the present invention. FIG. 2 is a plan view showing a re-tapping apparatus according to an embodiment of the present invention. Sectional view showing a coupler of the re-tapping apparatus according to the present invention.

1 to 3, a re-tapping apparatus according to an embodiment of the present invention includes a base plate 120, a support 130, a motor 140, a driving chuck 150, and a coupler 160 do.

The base plate 120 is installed on the base 110 so as to be movable in the first direction. The base 110 is formed with a rail portion (not shown) such that the base plate 120 is parallel to the first direction.

The first driving unit 123 is installed on the base 110 to move the base plate 120 in a first direction (up and down direction in FIG. 1). The first driving part 123 is a first piston driven by hydraulic pressure. When the fluid is supplied to the first driving part 123, the first driving part 123 advances the base plate 120 in the first direction. When the fluid is discharged from the first driving unit 123, the first driving unit 123 moves the base plate 120 backward in the first direction. Since the first driving unit 123 moves the base plate 120 by the hydraulic pressure, noise can be reduced when the base plate 120 is transported.

The second driving unit 125 is installed to move the base plate 120 in the second direction (front-rear direction in FIG. 1). The second driving portion 125 is a second piston driven by the hydraulic pressure. When fluid is supplied to the second driving part 125, the second driving part 125 advances the base plate 120 in the second direction. When the fluid is discharged from the second driving part 125, the second driving part 125 moves the base plate 120 backward in the second direction. Since the second driving part 125 moves the base plate 120 by the hydraulic pressure, the noise can be reduced when the base plate 120 is transported.

The support base 130 is installed on the base plate 120 so as to be movable in the second direction. The second direction is perpendicular to the first direction. The support base 130 reciprocates in a second direction perpendicular to the direction in which the base plate 120 is moved. A rail portion is formed on the base plate 120 so as to be parallel to the second direction.

The motor unit 140 is installed on one side of the supporter 130. The rotation axis of the motor unit 140 is formed parallel to the conveying direction (second direction) of the support base 130.

The third driving unit 127 is installed on the base plate 120 to move the support base 130 in the third direction (left and right direction in FIG. 1). The third drive 127 is rotated together with the base plate 120. The third drive 127 is a third piston driven by hydraulic pressure. When the fluid is supplied to the third driving unit 127, the support base 130 is advanced along a rail (not shown) of the base plate 120. When the fluid is discharged from the third driving unit 127, the support base 130 is moved backward along the rail portion of the base plate 120. Since the third driving unit 127 moves the support base 130 by the hydraulic pressure, the noise can be reduced when the support base 130 is transported.

The driving chuck 150 is installed on the support base 130 and is coupled to the motor unit 140. The driving chuck 150 includes a fixed housing 151 fixed to the support base 130 and a driving shaft 153 disposed inside the fixed housing 151 and connected to the rotating shaft of the motor unit 140 do. As the motor unit 140 is driven, the drive shaft 153 is rotated. The driving shaft is installed in parallel with the third direction so as to be coaxial with the rotation axis of the motor unit 140. Since the driving shaft 153 of the driving chuck 150 is rotated by the motor unit 140, the noise generated when the driving shaft 153 is rotated can be reduced.

The coupler 160 is movably installed on the drive shaft 153 along the longitudinal direction of the drive shaft 153, and the machining tap 101 is detachably coupled. The coupler 160 is moved from the drive shaft 153 to the nut 13 as the machining tab 101 is pulled by the threaded portion of the nut 13 when the machining tap 101 is rotated with the tool 13 engaged with the nut 13, . The clearance between the coupler 160 and the drive shaft 153 is generated due to the movement of the coupler 160 to the drive shaft 153 so that the rotation axis of the machining tap 101 is slightly twisted with the rotation axis of the drive shaft 153 The machining tap 101 can be rotated in a slightly distorted state. Therefore, it is possible to prevent the machining tab 101 from damaging the threaded portion of the nut 13.

One end of the machining tap 101 is coupled to the drive shaft 153 and the other end of the machining tap 101 is formed with a tab portion 102 to mate with the threaded portion of the nut 13. As the tab portion 102 is moved along the threaded portion of the nut 13, the foreign matter attached to the threaded portion is removed.

The coupler 160 includes a coupler body 161, a moving member 163, and an elastic member 165.

The coupler body 161 is coupled to the drive shaft 153. The coupler body 161 is rotated together with the drive shaft 153. [

The moving member 163 is coupled with the machining tap 101. The shifting member 163 is movably coupled to the coupler body 161 along the axial direction of the drive shaft 153.

The elastic member 165 is disposed between the moving member 163 and the coupler body 161 and exerts an elastic force on the moving member 163 to move the moving member 163 toward the driving shaft 153 side.

The moving member 163 is movably coupled to the coupler body 161 and the elastic member 165 applies an elastic force to the moving member 163 so as to move the moving member 163 toward the driving shaft 153, After the machining tab 101 is engaged with the nut 13, the machining tap 101 is pulled by the threaded portion of the nut 13. Even if the driving chuck 150 is stopped after the machining tab 101 is engaged with the nut 13, the machining tap 101 is pulled by the nut 13 as it is rotated, To the nut (13) side. Therefore, even if the machining tap 101 is rotated in a state slightly shifted from the rotation axis of the drive shaft 153, the threaded portion of the nut 13 is pressed against the machining tap (not shown) 101 can be prevented from being damaged.

A stepped portion 161a is formed in the coupler body 161 and a stepped groove 163a is formed in the moving member 163 so as to be coupled to the stepped portion 161a of the coupler body 161. One end of the elastic member 165 is supported by the coupler body 161 and the other end of the elastic member 165 is supported by the moving member 163 to exert an elastic force to push the moving member 163 toward the driving shaft 153. The moving member 163 is not pulled by the machining tab 101 before the machining tap 101 is engaged with the nut 13 so that the moving member 163 is moved by the resilient force of the elastic member 165 161). When the machining tap 101 is rotated after being engaged with the nut 13, the moving member 163 is pulled by the machining tap 101 as the machining tap 101 is moved along the screw portion, The coupler body 161 is spaced apart from the coupler body 161 as the coupler body 163 is slightly detached from the coupler body 161. Therefore, even if the machining tab 101 rotates slightly twisted with the rotation shaft of the drive shaft 153, it is possible to prevent the machining tap 101 from exerting an excessive pressure (frictional force) on the threaded portion of the nut 13. [ Furthermore, since the machining tab 101 prevents the threaded portion of the nut 13 from being damaged, it is possible to prevent the assembling process of the chassis frame 10 from being interrupted.

A locking end 161b is formed on one side of the coupler body 161 to support one side of the elastic member 165 and a restraining end 163b is formed on the moving member 163 such that the other side of the elastic member 165 is supported. do. The engaging end 161b of the coupler body 161 and the restraining end 163b of the shifting member 163 are resiliently mounted via the elastic member 165 so that the shifting member 163 is elastically biased against the elastic force of the elastic member 165 And can be brought into close contact with the coupler body 161. Further, the moving member 163 can be smoothly returned to the original position by the elastic force of the elastic member 165. [

The third driving unit 127 can be controlled to stop the movement of the driving chuck 150 when the machining tab 101 is engaged with the nut 13. [ At this time, it is possible to determine whether the machining tap 101 is engaged with the nut 13 by measuring the moving distance of the drive shaft 153 by the distance measuring unit 171. The drive chuck 150 is stopped in a state where the machining tab 101 is engaged with the nut 13 so that the drive shaft can be prevented from moving to the nut 13 side. The machining tab 101 is rotated by the motor portion 140 in a state where the machining tap 101 is engaged with the nut 13 so that the machining tap 101 is moved along the thread portion of the nut 13. [ At this time, the shifting member 163 is pulled by the machining tab 101 and moved in the direction of withdrawing from the coupler body 161. As the shifting member 163 is moved toward the nut 13, Contracted. Therefore, a clearance is generated between the coupler body 161 and the movable member 163, so that the machining tab 101 can be rotated in a state eccentric to the rotation shaft of the drive shaft 153 due to the clearance. Therefore, it is possible to prevent the threaded portion of the nut 13 from being damaged by the machining tap 101.

The motor unit 140 is controlled to rotate the drive shaft 153 in the reverse direction after a predetermined time elapses after the machining tab 101 is engaged with the nut 13. [ At this time, the preset time means a time at which the machining tap 101 is moved by a distance (the height of the nut 13) sufficient to re-tap the nut 13. The machining tab 101 is moved in the direction of being pulled out of the nut 13 by the threaded portion of the nut 13 when the motor portion 140 is rotated in the opposite direction to the drive shaft 153. [ When the machining tab 101 is disengaged from the nut 13, the movable member 163 is brought into close contact with the coupler body 161 as the elastic member 165 is expanded to the original position.

The distance measuring unit 171 is installed on the driving chuck 150 to measure the moving distance of the driving shaft 153 in the longitudinal direction. A nut sensing unit 175 is installed on the driving chuck 150 to sense the position of the nut 13 of the chassis frame 10. Various types of sensors may be applied to the distance measuring unit 171 and the nut sensing unit 175.

The operation of the re-piping apparatus according to an embodiment of the present invention will be described.

4 is a cross-sectional view showing a state in which a machining tab is opposed to a nut in a re-tapping apparatus according to an embodiment of the present invention.

Referring to FIG. 4, as the first driving unit 123 and the second driving unit 125 are driven, the base plate 120 and the support base 130 are moved. When the machining tab 101 is positioned to face the nut 13 of the chassis frame 10, the first driving part 123 and the second driving part 125 are stopped. Since the machining tab 101 is moved by the first drive part 123 and the second drive part 125 which are operated by hydraulic pressure, the noise generated when the machining tap 101 is moved can be reduced.

FIG. 5 is a sectional view showing a state in which a machining tab is engaged with a threaded portion of a nut in a re-tapping apparatus according to an embodiment of the present invention, and FIG. 6 is a cross- And Fig.

5 and 6, when it is determined that the machining tap 101 is opposed to the nut 13 by the signal sensed by the nut sensing unit 175, the third drive unit 127 is driven. When the third driving unit 127 is driven, the driving chuck 150 and the driving shaft 153 are moved toward the nut 13.

As the drive shaft 153 is rotated by the motor unit 140, the machining tab 101 enters the nut 13. When the machining tab 101 is engaged with the threaded portion of the nut 13, the third driving portion 127 stops the movement of the driving chuck 150 and the driving shaft 153. The movement of the drive shaft 153 is stopped with the machining tab 101 engaged with the threaded portion of the nut 13 so that the machining tap 101 is engaged with the threaded portion of the nut 13 and moved.

The machining tap 101 is moved to the inside of the nut 13 while the drive shaft 153 is stopped and the machining tap 101 pulls the moveable member 163. The shifting member 163 is pulled by the working tab 101 so that the shifting member 163 is slightly spaced from the coupler body 161 and spaced apart from the coupler body 161. [ Since the moving member 163 is moved from the coupler body 161 to form a clearance when the machining tab 101 is re-tapping the threaded portion of the nut 13, the machining tap 101 is moved to the rotational axis of the drive shaft 153 It is possible to prevent the threaded portion of the nut 13 from being damaged by the machining tab 101 even if it is rotated in a slightly twisted state. Therefore, the assembling process can be smoothly performed after the re-tapping process of the chassis frame 10.

7 is a cross-sectional view showing a state in which a machining tab is missing from a threaded portion of a nut in a re-tapping apparatus according to an embodiment of the present invention.

Referring to FIG. 7, when the predetermined time has elapsed after the machining tab 101 is engaged with the nut 13, the motor unit 140 rotates the drive shaft 153 in the opposite direction. As the drive shaft 153 is rotated in the opposite direction, the machining tab 101 is disengaged from the nut 13. The moving member 163 is brought into close contact with the coupler body 161 as the elastic member 165 is extended to the original position.

The motor part 140 and the third driving part 127 are stopped and the first driving part 123 and the second driving part 125 are driven to move the machining tap 101 to face the other nut 13. As the motor 140 and the third drive 127 are driven, the other nut 13 is re-tapped as described above.

As described above, when the machining tab 101 is rotated with the nut 13 engaged, the coupler 160 is moved from the drive shaft 153 to the gap between the coupler 160 and the drive shaft 153, It is possible to prevent the nut 13 from being damaged by the machining tap 101 even if the machining tap 101 is rotated in a state slightly shifted from the rotation axis of the drive shaft 153. [ Furthermore, it is possible to prevent the nut 13 of the chassis frame 10 from being damaged, thereby preventing the assembly process of the chassis frame from being interrupted.

Since the first driving part 123, the second driving part 125 and the third driving part 127 move the machining tap 101 by the action of hydraulic pressure and then re-tap the nut 13, And the productivity of the vehicle can be prevented from being lowered. Further, it is possible to reduce the noise generated when driving the re-tapping device.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

10: chassis frame 13: nut
101: machining tab 102: tab portion
110: base 120: base plate
123: first driving part 125: second driving part
127: third driving part 130:
140: motor unit 150: drive chuck
151: fixed housing 153: drive shaft
160: coupler 161: coupler body
161a: stepped portion 161b:
163: moving member 163a: stepped groove
163b: restraining end 165: elastic member
171: Distance measuring unit 175: Nut sensing unit

Claims

A base plate movably installed on the base;
A support table movably installed on the base plate;
A motor unit installed on the support base;
A drive chuck provided on the support and having a drive shaft rotatably coupled to the motor unit; And
Wherein the machining tab is movably provided along the longitudinal direction of the drive shaft to the drive shaft, and when the machining tap is rotated with the machining tap engaged with the nut of the chassis frame, And a coupler which is moved from the drive shaft to the nut side according to the pulling,
The coupler
A coupler body coupled to the drive shaft;
A moving member coupled to the machining tab and movably coupled to the coupler body along an axial direction of the drive shaft; And
And an elastic member disposed between the moving member and the coupler body and applying an elastic force to the moving member to move the moving member toward the drive shaft,
A stepped portion is formed on the coupler body,
A stepped groove is formed in the movable member so as to be coupled to the stepped portion of the coupler body,
Wherein the elastic member is supported on one side of the coupler body and the other side is supported on the moving member to exert an elastic force to push the moving member toward the driving shaft,
The movement of the drive shaft is controlled to be stopped when the machining tab is engaged with the nut,
When the machining tab is rotated after being engaged with the nut, the moving member is moved in a direction of being withdrawn from the coupler body as it is pulled by the machining tab, and the elastic member is contracted as it is pressed by the moving member And a second electrode.

delete

The method according to claim 1,
A coupling end is formed at one side of the coupler body so as to support one side of the elastic member,
Wherein the moving member is formed with a restraining end portion so that the other side of the elastic member is supported.

delete

The method according to claim 1,
Wherein the motor unit rotates the drive shaft in reverse when a predetermined time elapses after the machining tap is engaged with the nut.