KR101442131B1

KR101442131B1 - Automatic works change device for machining center

Info

Publication number: KR101442131B1
Application number: KR1020140030837A
Authority: KR
Inventors: 정현오; 김재우
Original assignee: 주식회사 정우기술
Priority date: 2014-03-17
Filing date: 2014-03-17
Publication date: 2014-09-25

Abstract

The present invention provides an elevating unit of a workpiece automatic exchanger which vertically piles and stores workpieces provided in the front of a machining center, and lifts and lowers a workpiece automatic exchanger which automatically supplies and discharges the workpiece to the machining center, to a position where the workpiece is stored. Accordingly, the space needed to store workpieces is used at maximum and the stored workpiece is smoothly supplied and discharged to the machining center.

Description

TECHNICAL FIELD [0001] The present invention relates to an automatic lifting / lowering unit for an automatic workpiece changing apparatus for a machining center,

The present invention relates to an elevating unit of a machining center workpiece changer, and more particularly, to an elevator unit for vertically stacking workpieces arranged in front of a machining center and vertically stacking the workpieces, and automatically feeding and unloading the workpieces to a machining center The automatic workpiece exchange apparatus is configured to be moved up and down according to the storage position of the workpiece so that the workpiece can be smoothly supplied to and taken out of the machining center while maximally utilizing the space for storing the workpiece, .

As is well known, a machining center is a type of complex machine tool that integrates a boring machine, a milling machine and a drilling machine into one. It is divided into a vertical machine, a horizontal machine, and a vertical / horizontal machine according to the direction of the main axis. , And machining centers are operated in three ways: linear motion, rotary motion, and spindle rotation. The positioning and spindle speed are controlled by numerical control (NC) servo and NC spindle.

On the other hand, the machining center is equipped with a workpiece changing device for automatically supplying and withdrawing a workpiece for machining to the machining center.

The workpiece exchange apparatus automatically feeds the workpiece onto a machining tool in a machining center, and after the machined workpiece is taken out, the machined workpiece is transferred to a set position, and then a new workpiece is clamped and supplied to the machining center. The drawing is continuously performed.

However, in the conventional workpiece exchanging apparatus, a supply unit, which is a means for supplying and withdrawing a workpiece to and from a machining center, is generally installed for a single period, which causes the following problems in the supply and withdrawal of the workpiece.

That is, when the workpiece is supplied into the machining center, the supply unit is waiting in front of the machining center during the machining time of the workpiece. When the machining is completed, the workpiece is taken out of the machining center, Since the other workpieces before machining are taken out and supplied to the machining center, not only the supply and retrieval of the workpiece is inefficient, but also the working time is unnecessarily delayed, thereby causing many problems in workability and productivity.

In addition, it is common that the supply unit supplies and withdraws the workpiece to and from the machining center by rotation of the table in a turntable manner, and thus interferes with various components provided in the machining center in the course of work.

[Prior Art Literature]

Document 1: Korean Patent Registration No. 10-0816637

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a machining center capable of automatically stacking workpieces vertically stacked vertically and vertically, The apparatus is configured to be moved up and down according to the storage position of the workpiece so that the stored workpiece can be smoothly supplied to and taken out of the machining center while maximally utilizing the space for storing the workpiece, have.

It is another object of the present invention to provide an automatic workpiece changer for a machining center that can move and stop the first and second pellets sequentially out of position without any clearance.

According to another aspect of the present invention, there is provided a machining center, comprising: a supply unit for supplying and discharging a workpiece into and from a machining center; And a center automatic workpiece changer.

In order to achieve the above-described objects, the present invention provides a railway car, comprising: a base for reciprocating left and right on a rail; an elevation unit installed on the base; a motor for driving the elevation unit; And a supply unit for supplying and discharging the workpiece to and from the machining center in accordance with the positions of the stacked workpieces, wherein the elevation unit includes a lift frame for supporting the supply unit, A post which is installed vertically along the outer edge surface of the lifting frame and supports the lifting frame movably in an upward and downward direction, a support plate which is installed between the lifting frame and supports the lifting frame, A guide rail installed to guide the upward and downward movement of the lift frame, A ratchet gear provided at one side of at least one of the guide rails for rotating the lifting frame in a state of being connected to the lifting frame by an attachement, A tension adjusting means for adjusting a tension of the chain belt by a belt and a pressing pin which comes into pressure contact with the chain belt and a control means for controlling the pulling operation of the pressing pin when the chain belt is broken, A cylinder connected to the rod of the cylinder and being pulled out forward by driving the cylinder, the ratchet gear being engaged with the ratchet gear, And a locating pin engaged with the gear of the elevating frame to stop falling of the elevating frame And means for controlling the operation of the apparatus.

The present invention can store a larger amount of workpiece in a narrow space by stacking workpieces arranged in front of a machining center vertically and vertically so as to automatically store and supply workpieces to a machining center, Up and down according to the storage position of the workpiece so as to smoothly supply and withdraw the workpiece stored in the upper and lower layers to the machining center.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an automatic workpiece changer installed in a machining center according to the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
Fig. 3 is a side view of Fig. 2; Fig.
Fig. 4 is a three-dimensional view showing the configuration of the supply unit shown in Fig. 3; Fig.
5 is a front sectional view of Fig.
6 is a side cross-sectional view of Fig.
7 is an operational state diagram of the supply unit shown in Fig.
8 is a three-dimensional view showing the configuration of an elevation unit in the automatic workpiece changing device according to the present invention.
9 is a side view of Fig. 8; Fig.
Fig. 10 is a plan view showing the main structure of the elevating unit shown in Fig. 8; Fig.
11 is a front view of Fig. 10; Fig.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following detailed description, exemplary embodiments of the present invention will be described in order to accomplish the above-mentioned technical problems. And other embodiments which may be presented by the present invention are replaced by descriptions in the constitution of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is a schematic view of a machining center 300 and a workpiece automatic changing device for automatically feeding and unloading a workpiece to and from the machining center 300. Referring to the drawings, The exchange apparatus 100 automatically performs the operation of supplying the workpiece 1 into the machining center 300 according to the operation of the supply unit 42 and drawing the finished workpiece 1 to move it to a separate storage die In particular, according to the present invention, a workpiece placed in front of a machining center 300 is stacked up and down, and the workpiece automatic changer 100 is lifted up and down according to the height of the workpiece stacked up and down. So that a larger amount of workpieces can be stored and supplied to the machining center 300 in a narrow space.
The detailed structure of the above-described automatic workpiece exchange apparatus 100 will be easily understood by referring to FIGS. 2 to 7 described later.
Referring to FIGS. 2 to 7, the automatic workpiece changer 100 is formed in a rectangular shape with a base 10 placed on a plurality of rails 20, and the base 10 is provided with a lift unit 200, Unit 42 is installed.
The lifting unit 200 vertically moves the workpiece 1 vertically so that the workpiece 1 can be easily supplied and drawn without interfering with the components in the machining center 200. In addition, The structure of the elevating unit is provided for the purpose of raising and lowering the automatic workpiece changer in accordance with the height of the workpiece placed in front of the worker while being stacked up and down in front of the center. Will be described in more detail.
The supply unit 42 is provided on a lifting frame of the lifting unit 200 and moves in the forward and backward directions with the power of the respective motors 44 to move the work 1 to the machining center 200 And the machining center 200. The detailed structure of the supply unit 42 will be described with reference to FIGS. 5 to 7 attached hereto.
The supply unit 42 is largely divided into a fixed rail 35 and first and second pellets 60 and 90.
The fixed rails 35 are fixedly mounted on the lifting frame 34 of the above-described lifting unit 24, and a plurality of first rollers 48 are installed on both sides of the lifting frame 34 at a predetermined interval. The first roller 48 is moved in the forward and backward directions of the first pellet 60 in a state where the first roller 48 is fitted in the first guide groove 66 of the guide 64 provided on both sides of the first pellet 60 So that it is guided to be stable.
A motor 44 is installed below the fixed rail 35 and a pinion 46 is coupled with the axis of the motor 44 through the fixed rail 35. The pinion 46 The rack 61 provided on the first pellet 60 is engaged.
A fixed sprocket (50) is provided at the center of the upper surface of the fixed rail (35). The fixed sprocket (50) has a rod shape and a tooth (52) for engaging the chain (80) is formed on the upper surface.
The first pellet 60 is moved forward and backward by receiving the power of the driving motor 44. The first pellet 60 has a plate type plate 62 at the center and a guide 64 at both sides of the plate 62 And is movably positioned on the upper surface of the fixed rail.
A rack 61 is provided at a lower end of the first pellet 60 of the plate 62. The rack 61 includes a pinion 46 coupled to the shaft of the motor 44 to rotate in the forward and reverse directions, So that the first pellet 60 is moved in the forward and backward directions while being linearly moved by the rotational force of the pinion 46.
The first and second shafts 70 and 72 are coupled to the first pellet 60 before and after the plate 62. The first and second shafts 70 and 72 are provided with first and second idle pulleys 70 and 72, And a chain 80 is wound around the first and second idle pulleys 74 and 76. The chain 80 is again engaged with a fixed sprocket 35 provided on the fixed rail 35, Is engaged with the teeth (94) formed on the moving sprocket (92) provided in the first pellet (50) and the second pellet (90). The chain 80 rotates in the state of being engaged with the teeth 52 formed on the fixed sprocket 50 of the fixed rail 35 in accordance with the movement of the first pellet 60, The moving sprocket 92 is engaged with the teeth 94 formed on the moving sprocket 92 of the first and second moving sprockets 90 and 90 so that the second pellet 90, So that it is moved.
That is, according to the present invention, since the first and second pellets 60 and 90 are moved by the power of the motor 44 and the second pellet 90 is moved again through the chain 70 separately, The pellet 90 does not move at the same speed with the movement of the first pellet 60 but is added to the rotational movement of the chain 80 so as to move forward and backward at a speed higher than the moving speed of the first pellet 60 It becomes possible to move. Particularly, when the second pellet 90 is moved, when the power is transmitted through the gear engagement structure as in the prior art, the clearance of the second pellet 90 is large due to the gear backlash. On the other hand, 80 so that the second pellet 90 can be moved and stopped at an accurate position without clearance.
The second pellet 90 moves or moves according to the movement of the first pellet 60. The first pellet 60 is connected to the first pellet 60, So that the workpiece 10 can be quickly supplied to and drawn from the machining center 200. The chain 80 is connected to the chain 80 and moves forward and backward at a speed higher than the moving speed of the first pellet 60.
A moving sprocket 92 having a bar shape and a bottom surface formed with teeth 94 is mounted on the lower end of the second pellet 90 and the tooth 94 of the moving sprocket 92 When the chain 80 rotates while the chain 80 is wound around the first and second idle rollers 74 and 76 of the first pellet 60 described above, The second pellet 90 is moved at a constant speed together with the first pellet 60 by the power of the motor 44 and then moved again through the chain 80 So that it is possible to move forward and backward at a speed higher than the moving speed of the first pellet 60.
A plurality of second rollers 96 are provided on both sides of the second pellet 90 while being separated from each other by a predetermined distance and the second rollers 96 are installed on both sides of the first pellet 60 64 of the second pellet 90 in a state of being fitted in the second guide groove 68 of the second pellet 90. [
As described above, the elevating unit 200 is configured to raise and lower the supply unit 42, which is an automatic workpiece changer, in accordance with the height of the workpiece being stored in the state of being stacked up and down in front of the machining center 100 To be used for the purpose.
FIG. 8 is a three-dimensional view of the configuration of the elevating unit in the automatic workpiece changer according to the present invention. FIG. 9 is a side view of FIG. 8, and FIG. 10 is a cross- Fig. 11 is a view showing a front view of Fig. 10. Fig.
8 to 11, the lifting unit 200 includes a lifting frame 210 for supporting the supply unit 42 described above and a lifting frame 210 vertically installed along the outer edge surface of the lifting frame 210 And a support plate 230 installed between the posts 220 and supporting the posts 220. The post 220 supports the lifting and lowering of the lifting frame 210, .
The supporting plate 230 of the supporting plate 230 is provided with driving means 240 for moving the lifting frame 210 upward and downward.
The driving unit 240 includes a pulley 244 that is driven by the power of a motor 242 driven by an external power source and is driven by an external power source, 244) and a driven plate pulley (246) axially coupled to the support plate (230), and a driven pulley (244) and a driven pulley (246) And a chain belt 248 which is rotated and moved by the chain belt 248 while being attached to the lifting frame 210 which supports the supply unit 42, An attattement 250 for lifting and lowering the lifting frame 210 and a lifting unit 250 supported by the supporting plate 230 and pressing the chain belt 248 in one direction to adjust the tension of the chain belt 248 And tension adjusting means 252.
The tension adjusting means 252 is constituted by a pressing pin 256 which is in one end contacted with the chain belt 248 and whose other end elastically pushes the chain belt 248 by the power of the cylinder 254.
The tension adjusting means 252 further includes a sensing sensor 258. The detection sensor 258 detects that the chain belt 248 is broken due to the load of the lifting frame 210 during the lifting operation of the lifting frame 210 by the chain belt 248 The control unit detects a momentary drawing operation of the pressing pin 256 due to a break of the chain belt 248 and outputs a signal to the control unit. The braking means 280 installed on the lifting frame 210 is driven to prevent the lifting frame 210 from falling due to the breakage of the chain belt 248. In this case, The structure will be described in more detail below.
A guide rail 260 is provided on a post 220 supporting the lifting frame 210 and guide grooves 262 formed on the front surface of the guide rail 260 are provided in front of and behind the lifting frame 210 The roller 264 connected to the bracket 266 is inserted to guide the vertical movement of the lifting frame 210.
On one side of two guide rails 260 arranged in a diagonal direction among at least one or more of the guide rails 260, preferably, the guide rails 260 provided on the posts 220, And a locating pin 286 which is a braking means 280 installed on the lifting frame 210 is installed on the gear teeth 272 of the ratchet gear 270, .
The braking unit 280 is automatically driven by the detection signal of the detection sensor 258 when the chain belt 248 is broken without supporting the load of the supply unit 42 supported by the lifting frame 210, The pin 286 is advanced so that the tip of the locating pin 286 is connected to one of the gear teeth 272 of the gear teeth 272 formed in the ratchet gear 270 provided on one side of the guide rail 260 So that the lifting frame 210 is stopped to fall. The braking means 280 is constructed by arranging a plurality of braking means 280 in front of and behind the lifting frame 210 with the same structure in accordance with the position of the ratchet gears 270 provided in the two guide rails 260 In the following, one braking means structure will be described with reference to Figs. 10 and 11 attached hereto.
10 and 11, the braking means 280 includes a cylinder 282 driven by a signal from the detection sensor 258 and fixed to the lift frame 210 by a bracket 281, The ratchet gear 270 is engaged with the rod 284 of the cylinder 282 and moves forward according to the drawing operation of the rod 284 according to the driving of the cylinder 282, And a locating pin 286 which is engaged with any of the gears 272 of the gear 272.
The braking means 280 of the above configuration can not support the load of the supply unit 42 supported by the lifting frame 210 and adjusts the tension of the chain belt 258 when the chain belt 258 is broken The pressing pin 256 of the tension adjusting means 252 is instantaneously pulled out forwards and the sensing sensor 258 senses the pulling of the pressing pin 256 and outputs a signal to the control unit. The locating pin 286 is moved forward by the pulling operation of the rod 284 in accordance with the driving of the cylinder 282 and the locating pin 286 is moved to the guide rail 260 The braking force is generated so that the lift frame 210 is prevented from falling by being caught by the gear teeth 272 of the ratchet gear 270 installed.
Hereinafter, the operation of the workpiece changer of the machining center according to the present invention will be described with reference to FIGS. 1 to 11. FIG.
First, when the workpiece before machining is placed on a supply unit 42 provided in the automatic workpiece exchange apparatus, the automatic workpiece exchange apparatus moves on the rail 20 to the front of the machining center 200.
Thereafter, the elevating unit 200 installed in the automatic workpiece changer is operated to raise and lower the supplying unit 42 in accordance with the position of the workpiece being stored in the state of being stacked up and down in front of the machining center 100 do.
9 and 10, when power is supplied to the motor 242, which is the driving source of the elevation unit 200, the pulley 244, which is a drive, is rotated by the power of the motor 242, The chain belt 248 wound around the chain pulley 244 and the driven chain pulley 246 is rotated by the rotational force of the drive chain pulley 244 so that the lifting frame 210 of the lifting unit 200 is rotated, The attachment 250 installed on the chain belt 248 moves up and down the lifting frame 210 in accordance with the rotation of the chain belt 248, 210 are moved up and down in accordance with the position of the workpiece being stored in a state of being stacked up and down in front of the machining center 100 to draw out the workpiece and supply the workpiece to the machining center do.
At this time, if the chain belt 248 can not support the load of the supply unit 42 in the process of raising and lowering the supply unit 42, the supply unit 42 may fall and cause a serious accident. At this time, the braking means 280 of the present invention operates to generate the braking force so that the supply unit 42 does not fall.
10, when the chain belt 248 is cut off, the pressing pin 256 of the tension adjusting means 252 for adjusting the tension of the chain belt 248 is instantaneously pulled out forwards, When the pressing pin 256 is instantaneously drawn out, the sensing sensor 258 installed on the tension adjusting means 252 senses it and outputs a signal to the control unit. (282).
At the same time, the rod 284 of the cylinder 282 is pulled out and moves the locating pin 286 forward, so that the locating pin 286 rotates the ratchet gear 270 And the braking force is generated so that the lift frame 210 does not fall.
When the supply unit 42 ascends and descends through the above process, the motor 44 as the driving source of the supply unit 42 operates to supply the workpiece 1 to the machining center 200. [
8, when the power of the motor 44 is applied, the pinion 46 coupled to the shaft of the motor 44 is rotated, and at the same time, one side of the first pellet 60 And the rack 61 engaged with the pinion 46 moves linearly to move the first pellet 60 toward the machining center 200. [
When the first pellet 60 moves, the second pellet 90, which is placed on the first pellet 60 and on which the workpiece 1 is mounted, moves in conjunction with the first pellet 60 and moves the workpiece 1 to the machining center 200 . At this time, the second pellet 90 performs the forward and backward movement at a speed higher than the moving speed of the first pellet 60 through the chain 80. The chain 80 wound around the idle rollers 74 and 76 of the first pellet 60 is rotated by the first pellet 60 and the second pellet 60, At the same time, engaged with the teeth 94 formed on the moving sprocket 92 of the second pellet 90 to move the moving sprocket 92, The second pellet 90 is moved by the chain 80 in addition to the moving speed of the first pellet 60 through the movement of the second pellet 90, So that it is possible to move forward and backward at a speed higher than the moving speed of the first pellet 60. Particularly, when moving the second pellet 90, since the gap of the second pellet 90 is large due to the gear backlash when the power is transmitted through the gear engagement structure as in the conventional case, It is possible to move and stop the second pellet 90 to a precise position without a clearance, so that a more precise and stable operation can be performed.
The first and second pellets 50 and 54 serving as the supply unit 42 are machined by the reverse rotation of the motor 44 when the workpiece is supplied to the machining tool in the machining center 200 according to the operation of the supply unit. After the machining center 200 is quickly disengaged from the center 200, the machined workpiece is drawn out of the machining center 200 by the power of the motor 44 after waiting for the completion of the machining of the workpiece.

delete

20: Rail
24: lift unit 32: lift shaft
34: lift frame 35: fixed rail
42: supply unit 44: motor
50: Fixed sprocket 60: First pellet
80: chain 90: second pellet
92: Feed sprocket 100: Automatic work piece replacement device
200: Machining center

Claims

A lifting unit 200 installed on the base 10 and a lifting unit 200 mounted on the lifting unit 200 and driven by the power of the lifting and lowering unit, And a supply unit (42) for raising and lowering the workpiece in accordance with the position of the workpiece stacked up and down in front of the workpiece center (300) and supplying and withdrawing the workpiece to and from the machining center (300) As a result,
The elevating unit (200) includes:
A lift frame (210) for supporting the supply unit (42);
A post 220 vertically installed along the outer edge surface of the lifting frame 210 and supporting the lifting frame 210 so as to be movable upward and downward;
A support plate 230 installed between the posts 220 and supporting the posts 220;
A guide rail 260 installed on the post 220 to guide upward and downward movement of the lifting frame 210;
A ratchet gear 270 installed at one side of at least one of the guide rails 260;
A chain belt 220 mounted on the support plate 230 and rotated by the power of the motor 242 in a state where the lifting frame 210 is connected to the lifting frame 210 by the attachments 250, (248);
A tension adjusting means 252 composed of a pressing pin 256 pressingly contacting the chain belt 248 to adjust the tension of the chain belt 248;
A sensing sensor 258 installed in the tension adjusting means 252 for sensing a pulling operation of the pressing pin 256 when the chain belt 248 is broken and outputting a signal to the control unit;
A cylinder (282) installed in the lifting frame (210) and driven according to a signal of the detection sensor (258);
And a locating pin 286 coupled to the rod 284 of the cylinder 282 and pulled forward by driving the cylinder 282 to be engaged with the gear 272 of the ratchet gear 270, And braking means (280) for stopping the falling of the lifting frame (210).