KR102101501B1 - Nut auto press and check device - Google Patents

Abstract

The present invention relates to an apparatus for automatically indenting and inspecting a nut, which is implemented to test whether the nut is pressed into ten workpieces in a single operation or whether ten nuts are normally pressed into the workpieces. The apparatus for automatically indenting and inspecting the nut of the present invention comprises a nut indenting unit which presses the nut into each workpiece if one row of ten workpieces at once is sequentially transferred and seated from a tray, in which ten workpieces form one row and are seated in a plurality of rows.

Description

Nut automatic press and inspection device {NUT AUTO PRESS AND CHECK DEVICE}

The present invention relates to a device for automatically indenting and inspecting a nut, and more specifically, to implement indentation of a nut into 10 workpieces in a single operation or to inspect whether or not the 10 nuts are press-fitted into a nut. One nut is related to an automatic press-fitting and inspection device.

In general, a bus bar made of copper is used as a medium for supplying and distributing power, distribution panels, and control panels installed for the supply and control of electrical energy. The bus bar has the disadvantage that it is difficult to process because it is not flexible, but it has the advantage of being able to transmit a larger amount of electrical energy than a cable and has a very high mechanical strength.

Securing electrical and mechanical safety as the number of units for power supply and the size of switchboard equipment increases due to the increase in unit capacity of power facilities and the rapid increase in power consumption due to the increase in power use due to social development and the dramatic development of power technology. Has emerged as an essential element. For this reason, various power facilities and various places such as factories, buildings, apartments, large discount marts, officetels, research complexes, department stores, golf courses, tunnel semiconductors, LCD factories, chemicals, oil refineries, steel, ultra high-rise buildings, ultra-high voltage substations, LNG take-off bases , Bus bars of various specifications are installed and operated to supply power to various fields such as new airports and ports.

The use of a power supply bus bar has been expanded and the allowable current capacity has been increased to cover the power supply according to the increase in load, but the busbar pressurizing part, that is, the connection part of the busbar connected to the water, switchboard, etc., the busbar and the busbar Since the connecting part, the head of the bolt and the nut installed on the connecting part of the busbar and the cable terminal protrude from the connecting part, the installation of insulating material is impossible, and the risk of safety accidents increases as it is exposed in the air.

On the other hand, the above-mentioned background technology is the technical information acquired by the inventor for the derivation of the present invention or acquired in the derivation process of the present invention, and is not necessarily a known technology disclosed to the general public before filing the present invention. .

Korean Registered Patent No. 10-0306458 Korean Registered Patent No. 10-0594346

In one aspect of the present invention, when a tray on which a workpiece is settled is transferred, 10 workpieces are transferred to a worktable installed for press-fitting a nut in one operation, and then supplied to a work-piece by receiving a nut for press-fitting the workpiece. Provided is an automatic nut press-fitting and inspection device that is pressed into the workpiece to be processed, and when the nut is press-fitted, the nut is press-fitted and then placed on the newly prepared tray in order.

In addition, 10 “products” are individually inspected using “touch-type” LVDT by the inspection department, and measurement data is also displayed on the display panel every time measurement data is measured on the equipment OP panel. Provided is a nut indentation and inspection device that is implemented so that the equipment can be stopped at the same time that it is marked in red.

In addition, an automatic indentation and inspection device for nuts is provided so that the user can sequentially lift and lift the workpieces seated in each row from the first row so that the user can easily grip the workpiece.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In the nut automatic indentation and inspection device according to an embodiment of the present invention, ten rows of workpieces are sequentially transferred and seated at a time from a tray in which ten workpieces form one row and are seated in multiple rows. It includes; a nut press-fitting portion for press-fitting the nut to the workpiece.

In one embodiment, the nut automatic indentation and inspection device according to an embodiment of the present invention, a nut supply unit for supplying 10 nuts at a time to be pressed in the nut indentation; A press-fitting test unit that checks whether the nut is press-fit into each work-piece when ten work-pieces in which the nut is press-fitted are transferred from the nut press-fitting part; 10 workpieces are transferred from the tray on which the workpiece is seated at a time to the nut press-in section, and 10 nuts at a time are transferred to the nut press-in section at a time, and the nut press-in section of the nut A first transfer unit that transfers ten indented workpieces to the indentation inspection unit; A second conveying unit which transfers the workpiece, which has been inspected for nut indentation, in the indentation inspection unit to an empty tray; And reading whether the workpiece is good or bad through whether or not the nut inspected by the indentation inspecting unit is normal, and whether or not the workpiece is good or bad, outputs individually for each workpiece using a display device, and presses when a defective product occurs. It may further include; a failure alarm unit for stopping the process and the inspection process and notifying it.

In one embodiment, the nut press-fitting portion, a seating shelf in which ten workpieces transferred by the first transfer portion are spaced apart from each other; 10 support frames installed between the 10 work pieces seated on the seating shelf; 10 indentation bars that are connected to the inside of each of the 10 support frames and are exposed from the support frame when the nut is transferred from the nut supplying part and seated in the press position, thereby pressing the nut into close contact with the workpiece; A driving frame installed at the front end of the seating shelf and slidingly moved in the front-rear direction; And at the rear end of the drive frame, spaced apart from each other in correspondence with the positions of the ten press bars, so that the drive frame is retracted in the direction of the workpiece so that it can be accurately pressed into the workpiece during the press of the nut. It may include; 10 center pins inserted into the through-hole to support the nut.

In one embodiment, the nut supply unit, a hopper containing a nut to be supplied to the nut press-fitting portion; A transmission line extending from the hopper and sequentially transmitting nuts supplied from the hopper; And 10 seating grooves are formed along the upper side for the nut to be seated from the transfer line, the seating tray for sliding the nut transmitted from the transfer line to the 10 seating grooves in sequence while sliding in the left and right directions; It can contain.

In one embodiment, the first transfer unit, a robot arm formed of a multi-joint robot to transfer the nut or the workpiece according to the press-in or inspection process of the nut; A seating plate installed under the robot arm; 10 pairs of workpiece adsorbing plates which are installed spaced apart from each other along the lower side of the seating plate and fasten the workpiece through an air adsorption direction; And it is installed spaced apart from each other along the lower front end of the seating plate, 10 nut adsorbing plate for fastening the nut through the air adsorption direction; may include.

In one embodiment, the indentation inspection unit, the inspection shelf is seated ten workpieces in which the indentation of the nut transferred from the nut indentation by the first transfer unit is completed; And 10 probes installed between the 10 workpieces mounted on the inspection shelf, and performing individual height inspection of each nut using a touch-type Linear Variable Differential Transformer (LVDT).

In one embodiment, in the indentation inspection unit, 10 pieces of workpieces that have been inspected for nut indentation are transferred, and 10 pieces are sequentially seated in a row, so that the user can easily grasp the workpieces in one row in a row. It may further include; improved trays that are sequentially lifted from and exposed to the upper side.

In one embodiment, the improved tray, the base plate; A plurality of seating spaces forming a plurality of partitioned spaces for seating a workpiece along the upper side of the base plate; A sliding plate slidingly moved in the left and right directions in the inner space of the base plate; A plurality of rack gears facing each of the plurality of seating spaces and extending in left and right directions along an upper side of the sliding plate; A plurality of lifting plates installed on each of the bottom surfaces of the plurality of seating spaces and lifting upwards to lift a workpiece seated in the seating space; And is formed of a plurality of pinion gears that are installed in engagement with each other in the vertical direction, the pinion gear located at the lowermost side is installed in engagement with the rack gear, rotates as the rack gear moves, and is best installed in engagement with the lifting plate. It may include; a plurality of pinion gear group for lifting the lifting plate as the pinion gear located on the side rotates.

In one embodiment, the plurality of rack gears, each of which is formed in the same width as a predetermined width in the left and right direction, the rack gear positioned at the rear end from the rack gear positioned at the front end facing the seating space where the workpiece is firstly seated As it goes to, it can be arranged to form a step-shaped step, being spaced apart at a predetermined distance in one direction.

In one embodiment, the lifting plate, horizontal frame is formed extending in the horizontal direction left and right to be seated on the bottom surface of the seating space; A first vertical frame extending from a lower side of the horizontal frame in a right angle direction to the lower side, and a gear mount formed in an up and down direction along an outer surface to engage a pinion gear positioned at the top of the pinion gear group; And a gear extending in a vertical direction along an inner surface facing the first vertical frame so as to be engaged with a pinion gear positioned at the uppermost side of the pinion gear group, extending from the other lower side of the horizontal frame to a lower right angle direction. And a second vertical frame on which the acid is formed.

According to one aspect of the present invention described above, the transfer or press-fitting of a nut or a workpiece is performed 10 at a time with one drive to perform press-fitting and inspection, and all of Tray, Busbar, and Nut feeds are driven by an air adsorption method. In addition, by using the robot in the process of indentation and inspection, it is possible to provide an effect of improving the efficiency by more than twice the working time standard compared to a semi-automatic indenter in which a current person is continuously input and working.

In addition, it is possible to improve the user's work convenience by elevating the workpieces seated in each row in order from the first row and exposing them upward so that the user can easily grip the workpiece.

The effects of the present invention are not limited to the above-mentioned effects, and various effects may be included within a range obvious to those skilled in the art from the following description.

1 is a view showing a schematic configuration of a nut automatic indentation and inspection device according to an embodiment of the present invention.
FIG. 2 is a view showing a nut supply unit of FIG. 1.
3 is a view showing a nut indentation of FIG. 1.
4 and 5 are views showing the first transfer unit of FIG. 1.
FIG. 6 is a view showing the indentation inspection unit of FIG. 1.
7 is a view comparing a workpiece before and after the nut is pressed according to the present invention.
8 is a view showing a tray in which a workpiece to which a nut is pressed is seated according to the present invention.
9 is a view showing an improved tray according to the present invention.
10 to 13 are views showing the lift plate of FIG. 9.

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the present invention may be practiced. These examples are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and properties described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it should be understood that the location or placement of individual components within each disclosed embodiment can be changed without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed. In the drawings, similar reference numerals refer to the same or similar functions across various aspects.

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

1 is a view showing a schematic configuration of a nut automatic indentation and inspection device according to an embodiment of the present invention.

Referring to FIG. 1, an automatic nut indentation and inspection device 10 according to an embodiment of the present invention includes a nut indentation unit 100.

The nut press-fitting part 100 includes 10 rows of 10 workpieces (B) at a time from the tray (T1), which is seated in a plurality of rows while 10 workpieces (B) form one row. When delivered in turn and seated, the nut (N) is pressed into each work piece (B).

Nut automatic indentation and inspection device 10 according to an embodiment of the present invention having the configuration as described above, the nut supply unit 200, the indentation inspection unit 300, the first transfer unit 400, the second transfer unit 500 ) And a bad alarm unit.

The nut supply unit 200 supplies the nuts N to be press-fitted from the nut press-fitting part 100 to the nut press-fitting part 100 by the first transfer part 400 one at a time.

The press-fitting inspection unit 300, when the 10 work pieces (B) in which the nut (N) is press-fitted from the nut press-fitting part (100) is transferred to and seated by the first transfer part (400), to each work piece (B) Inspect whether the nut (N) is press-fit normally.

The first transfer unit 400 transfers ten workpieces (B) at a time from the tray on which the workpieces (B) are seated to the nut press-fitting unit (100), and the nuts (N) supplied from the nut supply unit (200) ) Is transmitted to the nut press-fitting unit 100 one at a time, and 10 workpieces B which have been pressed into the nut N at the nut press-fitting unit 100 are transferred to the press-fitting inspection unit 300.

The second transfer unit 500 transfers the workpiece B, which has been inspected for the indentation of the nut N, by the indentation inspection unit 300 to the empty tray.

The defective alarm unit (not shown in the drawing for convenience of description) reads whether the workpiece B is good or not through normal press-fitting of the nut N inspected by the press-fit inspection unit 300, and the workpiece B Whether the product is good or bad is output individually for each work piece (B) using a display device, and when a defective product is generated, the press-in process and the inspection process are stopped and notified.

The nut automatic indentation and inspection apparatus 10 according to an embodiment of the present invention having the configuration as described above is carried out by pressing or inspecting 10 at a time when feeding or indentation of a nut or a work piece is performed in one operation. In addition, all the tray, busbar, and nut feeds are driven by the air adsorption method, and the process of press-fitting and inspection is improved by more than 2 times the working time standard compared to the semi-automatic press-fitting machine in which the current person is continuously input and working. I can do it.

FIG. 2 is a view showing a nut supply unit of FIG. 1.

Referring to FIG. 2, the nut supply unit 200 includes a hopper 210, a transmission line 220 and a seating tray 230.

The hopper 210 stores the nut N to be supplied to the nut press-fitting part 100, and the stored nut N is discharged through the transfer line 220.

The transmission line 220 extends from the hopper 210 and sequentially transmits the nut N supplied from the hopper 210 to the seating tray 230.

In the seating tray 230, 10 seating grooves for the nut N transferred from the transfer line 220 to be seated are formed along the upper side, and while sliding in the left and right directions, the transfer line 220 is transferred to the 10 seating grooves. The nut (N) transmitted from is seated in turn.

3 is a view showing a nut indentation of FIG. 1.

Referring to FIG. 3, the nut press-fitting part 100 includes a seating shelf 110, 10 support frames 120, 10 press-fitting bars 130, a driving frame 140 and 10 center pins 150. Includes.

In the seating shelf 110, ten workpieces B transferred by the first transfer unit 400 are spaced apart from each other and seated.

The support frame 120 is provided between (S) between each of the ten workpieces (B) seated on the seating shelf (110).

The press-fit bar 130 is connected to the inside of each of the ten support frames 120, and when the nut N is transmitted from the nut supply unit 200 and seated in the press-fit position, the nut is exposed while being exposed from the support frame 120. N) is pressed in close contact with the workpiece (B).

The driving frame 140 is installed at the front end of the seating shelf 110 and slides in the front-rear direction, and ten center pins 150 are installed along the rear end.

The center pin 150 is installed spaced apart from each other in correspondence with the positions of ten press bars 130 at the rear end of the drive frame 140, and can be accurately pressed into the workpiece B during the press of the nut N. So that the drive frame 140 is reversed in the direction of the workpiece (B), it is retracted together and inserted into the through hole of the nut (N) to support the nut (N).

The nut press-in portion 100 having the above-described configuration can improve the efficiency of the press-in process by accurately pressing the nut N into each of the ten workpieces B in one drive.

4 and 5 are views showing the first transfer unit of FIG. 1.

4 and 5, the first transfer unit 400 includes a robot arm 410, a seating plate 420, 10 pairs of workpiece adsorbing plates 430, and 10 nut adsorbing plates 440.

The robot arm 410 is formed of a multi-joint robot and transfers the nut N or the workpiece B according to the indentation or inspection process of the nut N (see FIG. 1).

The seating plate 420 is installed on the lower side of the robot arm 410, and the workpiece adsorbing plate 430 is installed in a row along the lower side.

A plurality of workpiece adsorbing plates 430 are installed spaced apart from each other along the lower side of the seating plate 420 and fastens the workpiece B through the air adsorption direction.

The nut adsorption plate 440 forms a lower space 441 for the nut N to be seated and is spaced apart from each other along the lower front end of the seat plate 420, and the nut N is provided through the air adsorption direction. To conclude.

The first transfer unit 400 having the configuration as described above, by moving 10 workpieces (B) or nuts (N) by only one drive, the workpiece (B) or the nut (N) according to the press-in process The transfer efficiency can be improved.

FIG. 6 is a view showing the indentation inspection unit of FIG. 1.

Referring to FIG. 6, the indentation inspection unit 300 includes an inspection shelf 310 and a probe 320.

In the inspection shelf 310, ten workpieces B in which the press of the nut N transferred from the nut presser 100 is completed by the first transfer unit 400 is seated.

The probe 320 is installed between each of the ten workpieces B mounted on the inspection shelf, and performs a separate height inspection of each nut N by using a touch-type Linear Variable Differential Transformer (LVDT).

The indentation inspection unit 300 having the above-described configuration can improve inspection efficiency by inspecting whether or not the nut N is normally indented in 10 workpieces B with only one driving.

The nut automatic indentation and inspection apparatus 10 according to an embodiment of the present invention having the configuration as described above may further include an improved tray 700.

In the improved tray 700, 10 pieces of workpieces B which have been inspected for indentation of the nut N in the indentation inspection unit 300 are transferred to each of the 10 pieces, and 10 pieces are seated in a row one by one, so that the user can easily attach the object B In order to be able to grip, the workpiece B seated in each row is sequentially lifted from the first row and exposed upward.

9 is a view showing an improved tray according to the present invention.

Referring to FIG. 9, the improved tray 700 includes a base plate 710, a plurality of seating spaces 720, a sliding plate 730, a plurality of rack gears 740, a plurality of lifting plates 750 and a plurality of And pinion gear groups 760.

The base plate 710 is formed in a flat plate shape.

The seating spaces 720a, 720b, 720c, and 720d form a plurality of partitioned spaces for the workpiece B to be seated along the upper side of the base plate 710, and 10 nuts are pressed into each space ( N) the workpiece (B) is seated in a row.

The sliding plate 730 slides in the left-right direction in the inner space of the base plate 710.

In one embodiment, the sliding plate 730 is exposed to the outside through an open hole 711 in which one side 731 is formed along one side of the base plate 710 to allow the user to press and move.

The rack gear 740 is formed to face each of the plurality of seating spaces 720a, 720b, 720c, and 720d and extend in the left and right directions along the upper side of the sliding plate 730.

The lifting plate 750 is installed on each of the bottom surfaces of the plurality of seating spaces 720 and lifts the workpiece B seated in the seating space 720 by being lifted upward.

The pinion gear group 760 is formed of a plurality of pinion gears 761a, 761b, and 761c that are installed to be engaged with each other in the vertical direction, and the pinion gear 761c positioned at the bottom is engaged with the rack gear 740. The pin gear which is installed and rotates as the rack gear 740 moves and engages with the threads of the lifting plate 750, that is, the first vertical frame 752 and the second vertical frame 753, and is located on the uppermost side of the connected installation. As the 761a rotates, the lifting plate 750 is elevated.

In one embodiment, the plurality of rack gears 740a, 740b, 740c, and 740d are formed to have the same width (eg, 5 cm to 15 cm, etc.), each of which is preset in the left and right directions, as shown in FIG. 12, The first distance from the seating space 720a on which the workpiece B is seated and the rack gear 740a located at the front end facing the rack gear 740d located at the rear end toward a predetermined distance in one direction (for example) , 5cm to 15cm, etc.) to form a stepped step.

Accordingly, the first vertical frame 752 and the second vertical frame 753, as shown in FIGS. 12 and 13, of the rack gears 740a, 740b, 740c, 740d on the lower side of the horizontal frame 751. The installation location is determined corresponding to the location.

10 to 13 are views showing the lift plate of FIG. 9.

10 and 13, the lifting plate 750 includes a horizontal frame 751, a first vertical frame 752, and a second vertical frame 753.

The horizontal frame 751 is formed to extend in the horizontal direction from the left and right to be seated on the bottom surface of the seating space 720, and the first vertical frame 752 and the second vertical frame 753 are formed on the lower side.

The first vertical frame 752 is formed to extend from the lower one side of the horizontal frame 751 in a lower right angle direction, and the outer surface so as to engage the pinion gear 761a located on the uppermost side of the pinion gear group 760. A gear acid 7521 is formed in the vertical direction along the direction.

The second vertical frame 753 is formed to extend from the other lower side of the horizontal frame 751 in a lower right angle direction, and is made to be engaged with the pinion gear 761a located at the uppermost side of the pinion gear group 760. 1 A gear mount 7531 is formed in the vertical direction along the inner surface facing the vertical frame 752.

The lifting plate 750 having the configuration as described above, by lifting the workpiece (B) seated in a plurality of seating spaces (720a, 720b, 720c, 720d) sequentially from the front end, the user can easily avoid It can be assisted to hold the workpiece (B).

The above-described embodiments are for illustration only, and those skilled in the art to which the above-described embodiments belong can easily be modified into other specific forms without changing the technical idea or essential characteristics of the above-described embodiments. You will understand. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope to be protected through the present specification is indicated by the claims, which will be described later, rather than the detailed description, and should be interpreted to include all modified or modified forms derived from the meaning and scope of the claims and the equivalent concept. .

10: Nut automatic indentation and inspection device
100: nut press
200: nut supply
300: indentation inspection unit
400: first transfer unit
500: second transfer unit
700: improved tray

Claims (2)

Includes a nut indentation unit for press-fitting a nut into each work piece when ten work pieces are sequentially transferred and seated at a time from a tray seated in a plurality of rows while ten work pieces form one row.
A nut supply unit supplying 10 nuts to be pressed at the nut press-in unit at a time; A press-fitting test unit that checks whether a nut is press-fit into each work-piece when ten work-pieces in which the nut is pressed are transferred and seated in the nut press-fitting part; 10 workpieces are transferred from the tray on which the workpiece is seated at a time to the nut press-in section, and 10 nuts at a time are transferred to the nut press-in section at a time, and the nut press-in section of the nut A first transfer unit that transfers ten indented workpieces to the indentation inspection unit; A second conveying unit which transfers the workpiece, which has been inspected for nut indentation, in the indentation inspection unit to an empty tray; And reading whether the workpiece is good or bad through whether or not the nut inspected by the indentation inspecting unit is normal, and whether or not the workpiece is good or bad, outputs individually for each workpiece using a display device, and presses when a defective product occurs. A failure alarm unit for stopping the process and the inspection process and notifying it;
The nut press-fitting portion, a seating shelf in which ten workpieces transferred by the first transfer portion are spaced apart from each other; 10 support frames installed between the 10 work pieces seated on the seating shelf; 10 indentation bars which are connected to the inside of each of the 10 support frames and are exposed from the support frame when the nut is transmitted from the nut supplying part and seated in the press position, thereby pressing the nut into close contact with the workpiece; A driving frame installed at the front end of the seating shelf and slidingly moved in the front-rear direction; And at the rear end of the drive frame, spaced apart from each other in correspondence with the positions of the ten press bars, so that the drive frame is retracted in the direction of the workpiece so that it can be accurately pressed into the workpiece during the press of the nut. Includes; 10 center pins inserted into the through-hole to support the nut,
The nut supply unit, a hopper containing a nut to be supplied to the nut press-fitting portion; A transmission line extending from the hopper and sequentially transmitting nuts supplied from the hopper; And 10 seating grooves are formed along the upper side for the nut to be seated from the transfer line, the seating tray for sliding the nut transmitted from the transfer line to the 10 seating grooves in sequence while sliding in the left and right directions; Includes,
The first transfer unit is formed of a multi-joint robot, a robot arm that transfers a nut or a workpiece according to a press-fitting or inspection process of a nut; A seating plate installed under the robot arm; 10 pairs of workpiece adsorbing plates which are installed spaced apart from each other along the lower side of the seating plate and fasten the workpiece through an air adsorption direction; And 10 nut adsorption plates which are installed spaced apart from each other along the lower front end of the seating plate and fasten the nut through the air adsorption direction.
The indentation inspection unit includes: an inspection shelf in which ten workpieces in which indentation of a nut transferred from the nut indentation is completed by the first transfer unit is seated; And 10 probes installed between the 10 workpieces mounted on the inspection shelf and performing individual height inspection of each nut using a touch-type linear variable differential transformer (LVDT).
In the indentation inspection unit, 10 pieces of workpieces that have been inspected for nut indentation are transferred, and 10 pieces are sequentially seated one by one, and the workpieces seated in each column are elevated sequentially from the first row so that the user can easily grip the workpiece. Improved tray for exposing to; further comprises,
The improved tray includes: a base plate; A plurality of seating spaces forming a plurality of partitioned spaces for seating a workpiece along the upper side of the base plate; A sliding plate slidingly moved in the left and right directions in the inner space of the base plate; A plurality of rack gears facing each of the plurality of seating spaces and extending in left and right directions along an upper side of the sliding plate; A plurality of lifting plates installed on each bottom surface of the plurality of seating spaces, lifting upwards and lifting a workpiece seated in the seating space; And is formed of a plurality of pinion gears that are installed in engagement with each other in the vertical direction, the pinion gear located at the lowermost side is installed in engagement with the rack gear, rotates as the rack gear moves, and is best installed in engagement with the lifting plate. Containing; a plurality of pinion gear group for raising and lowering the lifting plate as the pinion gear located on the side rotates.
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