KR20210138398A - Pallet transport apparatus equipped with linear motor - Google Patents

Abstract

The present invention relates to a pallet transport apparatus capable of changing the direction of a traveling pallet by using a linear motor, which can move a pallet with the force of the magnetic field generated between a stationary magnet (a coiled electromagnet) and a moving magnet (a permanent magnet), can easily change the transport direction of the pallet to a 90-degree direction in a simplified structure, and can simplify the structure of a rail unit and the pallet, improve assemblability, and can be made lightweight while ensuring safety during traveling. The pallet transport apparatus is installed on a rail unit including a first straight traveling rail and a second straight traveling rail cross-connected in different directions, and a direction changing rail coupled to the straight traveling rails to be laterally rotatable at the intersection therebetween, to change the direction of a traveling pallet by using a linear motor. The pallet includes: profiles each having a hollow portion and a mounting groove formed on the bottom surface thereof in a longitudinal direction to mount an electromagnet for a linear motor; a corner connector coupled to both ends of the profile to connect the profiles in a quadrangular shape, and having a rotational space portion with an open bottom; and a traveling unit axially installed in the rotational space portion to laterally rotate, and having a moving wheel supported by the upper surfaces of the straight traveling rails and the direction changing rail and traveling, and a guide roller slidably coupled to the inside of the straight traveling rails and the direction changing rail to prevent lateral separation.

Description

Pallet transport device that increases the rigidity of pallets and enables lighter weight

The present invention moves the pallet by the force of the magnetic field generated between the stationary magnet (coil-type electromagnet) and the moving magnet (permanent magnet), and through a simplified structure, the transport direction of the pallet can be easily switched to the 90 degree direction, It relates to a pallet transfer device capable of changing the direction of a moving pallet using a linear motor that enables the simplification of the structure of rail units and pallets, improvement of assembly and installation convenience, and weight reduction while ensuring safety while driving.

Conventionally, in various production processes such as semiconductor production facilities or LCD panel production facilities, a Free Flow Conveyor type transfer device has been used. Problems were pointed out that the transfer target article, that is, the substrate or LCD panel, is damaged or the alignment of the article is misaligned due to deterioration of quality due to attachment and vibration generated during transfer.

Accordingly, a transfer device using a linear motor (LM) mechanism has begun to be applied to various production processes. A linear motor (LM) type transport device drives a cart (carrier or pallet) mounted reciprocally along a guide rail based on the principle of a linear motor to move an article loaded on the cart to an arbitrary position. It has the advantage of being able to move the substrate from the to the target position without damaging the substrate or misaligning the alignment.

A linear motor (LM) transport device includes a guide rail disposed along a transport path, and a cart (carrier or pallet) disposed reciprocally along the guide rail, the cart (carrier, or pallet), a plurality of permanent magnets are arranged with alternating polarities, and a coil part (electromagnet) is disposed to face the permanent magnets on the guide rail, and a plurality of sensors are installed on the guide rail to detect the position and speed of the bogie. It is structured as listed.

Furthermore, by applying such a linear motor transfer method, technologies related to an improved linear motor (LM) transfer device that can change the traveling path of the transfer cart have been developed.

Korean Patent Registration No. 10-1686053 (hereinafter referred to as 'Prior Art 1'), Korean Patent Registration No. 10-1912360 (hereinafter referred to as 'Prior Art 2'), and Korean Registered Patent No. 10-1997053 (hereinafter referred to as 'Prior Art 2') Technique 3'), etc., discloses a pallet transport system using a linear motor that can change the transport direction of the pallet to be transported by 90 degrees.

As a pallet transport system using a linear motor, the pallet transport system disclosed in the prior art 1 to 3 capable of changing the direction, as shown in FIGS. 1a to 1c,

A pallet 10 that is moved to each process along a traveling path, a pair of horizontal traveling rails 22H and a pair of vertical traveling rails 22V, the horizontal traveling rail 22H serving as the traveling path of the pallet A rotation connecting rail 12 that is rotatably installed at a position where the vertical running rails 22V intersect, is spaced apart from the horizontal running rail 22H at regular intervals and installed along the direction of the horizontal running rail 22V. A direction coil driving part 30H, a longitudinal coil driving part 30V spaced apart from the vertical running rail 22V at a predetermined interval and installed along the direction of the vertical running rail 22V, and the lower part of the pallet 10 It is provided in the horizontal direction to the horizontal direction magnet module (20H) corresponding to the horizontal direction coil driving unit (30H), and is provided in the vertical direction at the lower portion of the pallet (10) to correspond to the longitudinal coil driving unit (30H) It is composed of a vertical magnet module (20V).

However, the prior arts 1 to 3 have the following problems.

First, as shown in FIGS. 1A to 1C (hereinafter, reference numerals in FIGS. 1A to 1D describing the prior art and FIGS. 2A to 8 describing the present invention are independent of each other.), Techniques are in a form in which the coil driving unit 30H (electromagnet) is disposed at a position spaced apart by a predetermined width (Dh, Dv) on one side of each running rail (22H) (22V), so that the pallet 10 is more than the width of the running rails After widening, as the coil driving part (30H) (30V) and corresponding permanent magnets (20H) (20V) are provided at one end of the protruding pallet, left and right imbalance of pallet weight occurs, and the strong As the action of manpower is added, the pallet 10 is lifted from one wheel part as the starting point and the other wheel part is lifted, causing vibration or noise, as well as misalignment of the loaded boards, including the risk of overturning while driving. Demand for driving safety is increasing.

In particular, as shown in Fig. 1c, in the conventional linear motor transfer structure, the gap is changed by the strong attractive force generated between the coil driving unit 30H (30V) and the permanent magnet (20H) (20V). The other wheel part is lifted, and such a change in the gap causes non-uniform driving performance, thereby deteriorating driving safety.

In addition, as the attractive force of the linear motor repeatedly acts on only a part of the protruding end of the pallet for a long period of time, deformation of the pallet such as sagging or distortion of the relevant part is easy to occur, so the conventional pallet has high strength and rigidity to prevent deformation. There is a disadvantage in that it is manufactured with a composite material or structure that can have, and in proportion to this, a linear motor with high output to be able to run is required.

On the other hand, although not shown in the drawing, in order to prevent the above problems, a linear motor structure may be adopted on both sides of each running rail. There is a problem that still contains the risk that both side ends of the pallet may sag from the wheels on both sides due to the attractive action of the pallet and may be deformed.

As another alternative, as shown in Figure 1d, after arranging the permanent magnets (20H) (20V) in a '+' shape in the center of the bottom surface of the pallet 10, the coil driving part 30H (30V) in the center between each running rail ), since normal driving is impossible under the influence of a magnetic field when the coil driving parts cross each other, there is a disadvantage that each coil driving part 30H and 30V must be divided into at least two and arranged.

Accordingly, the present invention has been devised to solve the above problems,

By installing the electromagnets and permanent magnets constituting the linear motor with the traveling unit of the pallet and the straight traveling rail, it is possible to increase driving safety by preventing lifting, sagging, or distortion of the pallet due to the attractive force of the linear motor.

Because the traveling unit supported on the rail offsets the attraction action of the linear motor, it is possible to reinforce the strength while reducing the weight of the pallet with a more simplified structure without using high-strength structures or materials.

The goal is to provide a pallet transfer device that can lower the center of gravity of the pallet and prevent the moving wheels from disengaging, enabling faster and more accurate transfer, improving the assembly of each rail and pallet, and improving safety by reinforcing structural rigidity. The purpose.

In order to achieve the above object, the pallet transport device according to the present invention,

Including a pallet installed on a rail unit having a first straight running rail and a second straight running rail that are cross-connected in different directions, and a direction changer rail rotatably coupled to the left and right at the intersection of the straight running rails, a linear motor In a pallet transfer device that can change the direction of a moving pallet using

The palette is

a profile having a hollow portion and a mounting groove formed on the bottom surface in the longitudinal direction to mount an electromagnet for a linear motor;

a corner connector coupled to both ends of the profile to connect the profiles in a rectangular shape, and having a rotational space with an open bottom;

A moving wheel mounted to rotate left and right in the rotational space and supported on the upper surfaces of the straight traveling rails and the direction changing rail and slidingly coupled to the inside of the straight traveling rails and the direction changing rail to prevent left and right deviation It characterized in that it includes; a traveling unit having a guide roller.

And in the pallet transport device according to the present invention,

The profile is characterized in that it includes a rib partitioning the hollow part into a plurality of empty spaces.

Furthermore, in the pallet transport device according to the present invention,

The profile and corner connectors are provided with first and second coupling grooves corresponding to each other on the respective inner and outer surfaces,

The pallet is fitted into the first coupling groove on the outer surface of the profile and the corner coupler to connect the profile and the corner coupler to a '-'-shaped first connecting plate, and the profile and the corner coupler are fitted into the second coupling groove on the inner surface of the profile and a 'L'-shaped second connecting plate for connecting the corner connector.

In addition, in the pallet transport device according to the present invention,

The corner connector includes a shaft hole that is provided on the upper surface of the rotation space part and the second rotation shaft of the traveling unit is axially installed,

The traveling unit may include a second bearing fitted to the second rotation shaft and supported on the inner circumferential surface of the shaft hole, and a second bearing fitted to the second rotation shaft and supported on a bottom surface around the shaft hole.

Pallet transport device according to the present invention,

Electromagnets and permanent magnets constituting the linear motor are arranged in a top-down overlapping structure between the traveling unit and the traveling rail. It is possible to prevent lifting and deformation such as sagging or warping, and because of this, it is unnecessary to reinforce the rigidity of the pallet, so it can be manufactured by reducing the weight with a more simplified structure,

By lowering the center of gravity of the pallet as much as possible and guiding the path with the guide roller, the pallet can be transported more quickly and accurately without departing from the running rail while driving.

There is no need for additional parts such as a housing for mounting the direction changer rail, so it is easy and convenient to assemble and install the rail.

1a to 1d is a view for explaining a conventional pallet transfer device.
Figures 2a to 2c is a perspective view for each driving position of the pallet according to the present invention.
3 is a front view of the driving unit according to the present invention.
4 and 5 are a front view and a side view of the main part of the pallet and rail unit of the present invention.
Figure 6 is an exploded perspective view of the main part of the rail unit according to the present invention.
7 is a sectional view of a main part of a rail unit according to the present invention.
Figure 8 is an abstract perspective view of the main part for explaining the interlocking of the direction change rail according to the present invention.

The present invention is intended to be described in detail in the text of the embodiment (態樣, aspect) (or embodiments) can be applied to various changes and can have various forms. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In each drawing, the same reference numerals, particularly the tens digit and the one digit, or the tens digit, the one digit, and the same alphabetic reference numerals indicate members having the same or similar functions, and, unless otherwise stated, each The member indicated by the reference sign may be understood as a member conforming to these standards.

In addition, in each drawing, components are expressed in exaggeratedly large (or thick) or small (or thin) in size or thickness in consideration of convenience of understanding, or simplified, but the protection scope of the present invention is limited by this. it shouldn't be

The terminology used herein is only used to describe a specific embodiment (aspect, aspect, aspect) (or embodiment), and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as comprises or consists of are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification is present, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

~1~, ~2~, etc. described in the present specification will be referred to only to distinguish that they are different components, and are not limited to the order of manufacture, and their names in the detailed description and claims of the invention are may not match.

For convenience in describing the pallet transport device according to the present invention, if an approximate direction standard that is not strict is specified with reference to FIG. 1A, the direction in which gravity acts is set to the lower side as it is in the visible direction, up, down, left and right, and other drawings and In the detailed description and claims of the related invention, directions are specified and described in accordance with this standard unless otherwise specified.

Hereinafter, a pallet transfer device capable of changing the direction of a pallet traveling using a linear motor according to the present invention will be described with reference to the accompanying drawings.

The present invention relates to a pallet transfer device, and largely includes a rail unit (R), a pallet (P), and a linear motor (LM).

The rail unit (R) is installed on the upper part of the base frame (B) to form a transport path of the pallet (P), and the electromagnet (EM) of the linear motor (LM) is installed.

Specifically, the rail unit (R) can be rotated left and right at the intersection of the first straight running rail 10 and the second straight running rail 20 cross-connected in different directions, and the straight running rails 10 and 20 It includes a direction changing rail 30 coupled to each other.

The first straight running rail 10 and the second straight running rail 20 are made of a pair spaced apart from each other by a predetermined distance to the left and right,

The first straight running rail 10 includes a first powder 10A having a mounting portion 10S on which the direction changing rail 30 is mounted on one end or both ends, and the length of the first powder 10A. On the other hand, it is composed of a second powder 10B extending in the direction

The second straight running rail 20 is coupled to and connected to both sides of the mounting part 10S in a cross direction,

There is only a difference in that the installation directions of the first and second straight running rails 10 and 20 are different (orthogonal directions).

Since the specific internal structures of the first and second straight running rails 10 and 20 are the same, hereinafter, the second straight running rail 20 will be described together by representing the reference numerals of the first straight running rail 10. .

First, the first straight running rail 10 and the second straight running rail 20 include both first supporting parts 12 forming the receiving part 11 to which the electromagnet EM is coupled.

That is, the straight traveling rails 10 and 20 have a cross section of a 'C' shape with an open upper surface.

In addition, a fitting groove (12a) formed in the longitudinal direction is provided on the inner surface of the first support part (12), and the guide bar (13) is fitted to the fitting groove (12a) to provide a guide roller (62) to be described later. support and guide

The reason why the inner surface of the first support part 12 was formed by additionally installing the guide bar 13 is that when abrasion occurs due to long-term friction with the guide roller 62, only the guide bar 13 is replaced and manufactured. 1 This is to easily maintain the flatness of the inner surface of the support part 12 .

Meanwhile, the first powder 10A includes cut-out grooves 14 formed by cutting a portion of the first supporting parts 12 on both sides of the mounting part 10S.

The cut-out groove 14 opens the inner and outer sides of the first supporting part 12 so that the receiving part 11 of the second straight running rail 20 is connected, and the direction changing rail 30 is When the second straight running rail 20 rotates 90 degrees to coincide with the longitudinal direction, the passage groove 32 of the direction changing rail 30 is aligned with the receiving part 11 of the second straight running rail 20 and the pallet (P) of the traveling unit (60, more strictly, the guide roller 62) to pass through to secure a space to travel.

The cut-out groove 14 has an arc shape whose cut surface corresponds to the outer circumferential surface of the direction changing rail 30 .

In addition, the first powder 10A, including a mounting hole 15 provided on the bottom surface of the mounting portion 10S, the first rotation shaft 33 of the direction change rail 30 is axially installed.

The reason for introducing the first powder 10A having the mounting portion 10S (the incision groove 14), the second powder 10B without the mounting portion 10S and the second straight running rail 20 in this way is, This is to improve productivity by modularizing the running rail into a single, dual component, and at the same time to change the size of the overall shape, length or width of the rail unit (R) to fit the site structure so that it can be installed easily.

And the direction changing rail 30 is mounted on the mounting part 10S and rotates 90 degrees left and right, and has a left and right straight surface having the same width as that of the first straight running rail 10, and the front and rear ends are semicircular. As a protruding form, the outermost imaginary line forms a circle during rotation.

Specifically, the direction changing rail 30 includes a second support part 31 extending and connected to the upper surface of the first support part 12 in the longitudinal direction, and the second support part 31 inside the second support part 31 . 1 It includes a passage groove (32) extending and connected to the inner surface of the support portion (12) in the longitudinal direction.

The passage groove 32 is formed concavely so as to have a width equal to the outer diameter of the guide roller 62 at a position spaced apart from the left and right straight surfaces of the direction changing rail 30 by the first support portion 12 inward. to form a second support part 31,

When the direction changing rail 30 rotates 90 degrees to the left and right, the second support part 31 and the passage groove 32 are aligned with the first straight running rail 10 or the second straight running rail 20 Depending on the,

The moving wheels of the pallet (P) travel along the upper surfaces of the first and second supports (12) and the second support (31) on both sides, and the guide rollers (62) of the pallet (P) are the first support on both sides. It is guided to the inner surface of the part 12 and the passage groove 32 .

In addition, the direction change rail 30 is fitted and coupled to the mounting hole 15, a support member 35 having a rotation hole 35a, and a first rotation shaft 33 fitted into the rotation hole 35a and axially installed. ) and a first bearing 36 fitted to the first rotating shaft 33 and supported on the inner circumferential surface of the rotating hole 35a.

The first straight running rail 10 has a plurality of hollows and grooves formed in the longitudinal direction for light weight and bolting coupling with installation parts such as the base frame (B). The member 35 is inserted into the mounting hole 15 to stably support the first rotation shaft 33 .

The first bearing 36 is a known bearing that reduces friction between the first rotation shaft 33 and the support member 35 and may be replaced with a friction reducing bushing.

In addition, the upper end of the first rotating shaft 33 is bolted to the direction changing rail 30 and fitted into the rotating hole 35a, in this case, the lower end of the first rotating shaft 33 is the lower portion of the first powder 10A. The pulley 34 exposed by the fitting is fitted, and the direction changing rails 30 provided at each corner of the intersection of the rail unit R are connected by one timing belt 37 and operate simultaneously.

The timing belt 37 rotates left and right by a driving means provided on the bottom surface of the first powder 10A or the second straight running rail 20 to simultaneously rotate the direction changing rails 30 left and right at the same angle, At this time, as a driving means for driving stability and control precision, it is more preferable that a cylinder 38 for reciprocating by moving the timing belt 37 forward and backward is used.

These rail units (R) are spaced apart from each other by a predetermined interval along the receiving portions 11 of the first and second straight running rails 10 and 20 located on one side, and the electromagnets EM are installed,

The electromagnet (EM) is composed of a driving coil part whose polarity is changed through application of power, and functions as a linear motor (LM) generating thrust of the pallet (P).

Next, the pallet (P) includes a loading unit, a traveling unit (60) which is provided rotatably from side to side on the bottom surface of the loading unit and coupled to be driven along the rail unit (R).

Such a pallet (P) may be composed of a plate of a general square flat plate shape like the conventional bogie, and the conventional bogie prevents deformation such as lifting and sagging or twisting due to the action of manpower while driving as described above. In order to prevent this, a high load and high strength of the bogie were achieved by stacking a high-weight flat plate.

On the other hand, the present invention does not cause the above problems by matching the electromagnet (EM) and the permanent magnet (PM) of the linear motor (LM) in the same line up and down with each straight running rail. Introduced a pallet (P) consisting of an assembly of profiles and corner connectors that can improve the performance.

Specifically, the pallet (P),

A profile 40 having a hollow part 41 and a mounting groove 43 formed on the bottom surface in the longitudinal direction to mount an electromagnet EM for a linear motor LM,

A corner connector 50 coupled to both ends of the profile 40 to connect the profiles 40 in a square shape, and having a rotational space 51 having an open bottom surface;

A moving wheel 61 axially installed on the corner connector 50 to rotate left and right in the rotation space 51 and supported by the upper surfaces of the straight running rails 10 and 20 and the direction changing rail 30 to run ) and a traveling unit 60 having a guide roller 62 slidingly coupled to the inside of the straight traveling rails 10 and 20 and the direction changing rail 30 to prevent left and right deviation.

The profile 40 and the corner connector 50 are assembled to become a pallet P in the form of a square ring without a bottom surface, and the transported goods are directly loaded on the upper surfaces of the profiles 40 and the corner connectors 50 and loaded. It may be utilized as a part, or a separate loading plate may be additionally coupled to the upper surface of the pallet P to be utilized as a loading part.

And the profile 40 includes a rib 42 for partitioning the hollow part 41 into a plurality of empty spaces.

The rib 42 forms a plurality of empty spaces divided into left and right or up, down, left and right in the hollow part 41 to reduce the weight of the pallet P, and at this time, the ribs 42 are formed on the inside of the slopes of the profiles 40 . support and reinforce the rigidity.

In addition, the profile 40 is provided with a mounting groove 43 formed along the longitudinal direction on the bottom surface, the mounting groove 43 is provided with a permanent magnet (PM) constituting the linear motor (LM).

The permanent magnet (PM) is that the magnets of the N pole and the S pole are cross-arranged in the longitudinal direction, and the attractive and repulsive force of each magnet crosses according to the change in the polarity of the electromagnet (EM), and the pallet (P) travels get thrust.

At this time, when the left and right widths of the pallet (P) match the left and right widths of the first and second straight running rails 10 and 20, the action point of the magnetic force (especially attractive force) generated by the linear motor (LM) is the pallet (P) is generated at the left and right end edges, and thus the profile 40 is supported by each of the straight traveling rails 10 and 20 while offsetting the attractive force generated in the linear motor LM, as in the prior art, the electromagnet ( Unlike EM) and permanent magnets (PM) that are separately provided inside and outside of each rail, it is possible to prevent lifting, deflection, or distortion of the pallet (P) occurring during driving, and through this, as described above It is possible to easily manufacture the pallet (P) at a low cost using the lightweight profile (40).

And the corner connector 50 is to form the corner of the pallet (P) by connecting the profiles 40 in a 'L' shape, the bottom surface of the corner connector 50 is opened and the circular rotational space (51) A shaft hole 52 is provided in the center of the upper surface of the rotational space 51 , in which the second rotation shaft 63 of the traveling unit 60 is axially installed.

In addition, a receiving groove 53 in which a portion of the upper end of the moving wheel 61 of the traveling unit 60 is accommodated is provided around the bottom surface of the shaft hole 52 .

The reason for introducing the receiving groove 53 is to lower the center of gravity of the pallet P with respect to the moving wheel 61 as much as possible to further increase the running stability of the pallet P.

On the other hand, the profile 40 and the corner connector 50 are provided with first and second coupling grooves 44, 45, 54 and 55 corresponding to each other on the inner and outer surfaces of each,

The pallet (P) is inserted into the first coupling grooves 44 and 54 of the outer surface of the profile 40 and the corner connector 50 to connect the profile 40 and the corner connector 50 in a '-' shape. The first connecting plate 56, the profile 40 and the inner surface of the corner coupler 50 are fitted into the second coupling grooves 45 and 55 to connect the profile 40 and the corner coupler 50. It includes a 'shaped second connecting plate (57).

The coupling grooves 44 , 45 , 54 , 55 and the connecting plates 56 and 57 are to be connected to each other by matching the heights of the profile 40 and the corner connector 50 , and each connecting plate can be coupled to the coupling groove by bolts or bonding methods.

When the assembly of the pallet P is made with the modular profile 40 and the corner connector 50, the pallet P can be easily assembled and produced in various sizes according to the number of use of the profile 40, and the straight line Through the linear motor (LM) structure arranged in the same line up and down with the running rails 10 and 20, it is possible to use a lightweight pallet P without reinforcement of additional rigidity.

Then, the traveling unit 60 receives the thrust from the linear motor (LM) and moves along the rail unit (R) to transport the pallet (P), each corner of the square pallet (P), that is, the corner It is mounted on the connector 50 .

The traveling unit 60 includes a moving wheel 61 traveling along the upper surfaces of the first and second supporting units 12 and 31 on both sides, and inner surfaces of the first supporting units 12 on both sides. and a guide roller 62 guided in the passage groove 32 .

At least one moving wheel 61 is provided on the left and right outer surfaces of the body 60M, and is axially rotatable in the vertical direction to move forward and backward.

At least one guide roller 62 is provided on each corner of the bottom surface of the body 60M, and is axially rotatable back and forth in the horizontal direction.

At this time, the guide roller 62 does not rotate so that the pallet P directly travels, but as a guide member that catches the left and right deviations of the pallet P, and functions to guide the straight line travel of the pallet P and prevent separation .

In addition, the traveling unit 60 is coupled to the second rotation shaft 63, which is installed on the shaft hole 52, protrudingly from the center of the upper surface of the body 60M, and is inserted into the second rotation shaft 63 and the shaft hole It includes a second bearing 64 supported on the inner circumferential surface of 52 , and a third bearing 65 fitted to the second rotation shaft 63 and supported on the bottom surface around the shaft hole 52 .

The second bearing 64 reduces friction between the second rotation shaft 63 and the shaft hole 52 , and the third bearing 65 is the bottom surface (rotation) of the body 60M and the corner connector 50 . The friction between the ceiling surfaces of the space portion 51) is reduced.

In addition, the body 60M has a rib structure similar to that of the profile 40 and is formed through in one direction to reduce weight and reinforce rigidity, which is due to the characteristic arrangement structure of the linear motor LM. It's like a bar.

In the state in which the moving wheel 61 rotates to coincide with the longitudinal direction of the first straight running rail 10 or the second straight running rail 20, the driving unit 60 is driven by the thrust of the linear motor LM. The pallet (P) is driven in a straight line by moving along each running rail by

After the moving wheel 61 stops in the passage groove 32 of the direction changing rail 30, when the direction changing rail 30 rotates 90 degrees by the operation of the cylinder 38, the traveling unit 60 is Rotating together, the direction of the pallet P running direction is switched.

In the above description of the present invention, the present invention has been mainly described with reference to the accompanying drawings, but the present invention is capable of various modifications, changes and substitutions by those skilled in the art, and these modifications, changes and substitutions are within the protection scope of the present invention. should be construed as belonging to

B : Base frame R : Rail unit
P : Pallet LM : Linear Motor
EM : Electromagnet PM : Permanent Magnet
10: first straight running rail 20: second straight running rail
30: direction change rail 40: profile
50: corner connector 60: driving unit

Claims (4)

A rail unit (R) having a first straight running rail 10 and a second straight running rail 20 cross-connected in different directions, and a direction changing rail 30 rotatably coupled to the left and right at the intersection of the straight running rails ), including the pallet (P) installed in the linear motor (LM) in the pallet transfer device that can change the direction while driving,
The palette (P) is,
a profile 40 having a hollow portion 41 and a mounting groove 43 formed on the bottom surface in the longitudinal direction to mount an electromagnet for a linear motor;
a corner connector 50 coupled to both ends of the profile 40 to connect the profiles in a rectangular shape, and having a rotational space 51 having an open bottom surface;
A moving wheel 61 that is rotated left and right in the rotational space 51 and supported on the upper surfaces of the straight running rails 10 and 20 and the direction changing rail 30 to run, and the straight running rails (10.20) and the traveling unit (60) having a guide roller (62) slidingly coupled to the inside of the direction changing rail (30) to prevent left and right deviation;
The method of claim 1,
The profile (40) is a pallet transport device, characterized in that it comprises a rib (42) for partitioning the hollow portion (41) into a plurality of empty spaces.
The method of claim 1,
The profile 40 and the corner connector 50 are provided with first and second coupling grooves 44, 45, 54, and 55 corresponding to each other on the respective inner and outer surfaces,
The pallet (P) is inserted into the first coupling grooves 44 and 54 on the outer surface of the profile 40 and the corner connector 50 to connect the profile 40 and the corner connector 50 in a '-' shape. The first connecting plate 56, the profile 40 and the inner surface of the corner coupler 50 are fitted into the second coupling grooves 45 and 55 to connect the profile 40 and the corner coupler 50. '-Shaped second connecting plate (57), characterized in that it comprises a pallet transfer device.
4. The method according to any one of claims 1 to 3,
The corner connector 50 is provided on the upper surface of the rotation space 51 and includes a shaft hole 52 in which the second rotation shaft 63 of the traveling unit 60 is axially installed,
The traveling unit 60 includes a second bearing 64 fitted to the second rotation shaft 63 and supported on the inner circumferential surface of the shaft hole 52 , and a second bearing 64 fitted in the second rotation shaft 63 to the circumference of the shaft hole 52 . Pallet conveying device comprising a third bearing (65) supported on the bottom surface of the.

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