JP5184184B2 - Load transfer device between upper and lower conveyors - Google Patents

Description

  The present invention relates to a load transfer device between upper and lower conveyors that transfers a transfer object between an overhead conveyor and a floor conveyor.

Deliver the object to be conveyed between the overhead conveyor that hangs the object to be conveyed by a hanger and conveys it along a predetermined path, and the floor conveyor that places the object to be conveyed on the carriage and conveys it along the predetermined path. As the load transfer device between the upper and lower conveyors, the lifting frame is extended from the state where the transported object is supported by the transported object supporting member connected to the lifting frame of the lifting apparatus by feeding the hanging chain with the lifting drive unit. There is one that lowers, opens the transported object support member, and places the transported object on a floor conveyor (see, for example, Patent Document 1).
In the load transfer device between the upper and lower conveyors configured as in Patent Document 1, since only the object to be conveyed is moved up and down, there is an advantage that the capacity of the lifting drive device can be made relatively small, but the object to be conveyed is supported. A drive device that rotates or expands and contracts the member is required, and the transfer of the transferred object from the overhead conveyor to the lifting frame and the transfer of the transferred object from the lifting frame to the floor conveyor are performed twice. Because of the configuration, there is a disadvantage that misalignment is likely to occur during transfer.

In order to eliminate the disadvantages of the load transfer device between the upper and lower conveyors, the rail on the floor conveyor side or the overhead conveyor side is divided into elevator guide rails (divided rails), and the object to be conveyed is raised and lowered together with these rails. (For example, refer to Patent Documents 2 and 3.) According to such a configuration, since the number of times of transfer is one, the occurrence of misalignment during transfer is prevented. Can be suppressed.
In the structure which divides and raises the middle of a rail like patent document 2 and 3, when connecting a raising / lowering guide rail (moving side rail) to a fixed side rail, it is necessary to perform alignment of these rails reliably. A configuration including a lock device (position restriction mechanism) that forcibly restricts the position of the elevating guide rail in the vertical and horizontal directions with respect to the fixed rail is common (see, for example, Patent Document 4).

JP 59-143899 A (Fig. 1-2) Japanese Examined Patent Publication No. 62-38255 (Fig. 1-2) Japanese Patent No. 2639696 (Fig. 1-2) JP 2004-345417 A (FIGS. 1 and 4-7)

In the conventional load transfer device between the upper and lower conveyors as described above, those having a structure that divides and raises the middle of the rail as in Patent Documents 2 and 3 reduce the number of times of transfer and position at the time of transfer Although there is a feature that it is possible to suppress the occurrence of deviation, the cost increases because it is necessary to provide the locking device.
In particular, when the difference in height between the upper and lower conveyors is large (see, for example, FIG. 1 of Patent Document 3), the positional displacement of the rail connecting portion is kept small so as to fall within the range in which the locking device operates. Since it is necessary, four struts of the lifting device are installed to support the lifting platform to which the lifting guide rail is attached (see, for example, FIG. 2 of Patent Document 3), or the rigidity is increased. Therefore, since it is necessary to reduce the deflection, the cost of the lifting device increases.

  Therefore, in view of the above-described situation, the present invention intends to solve the problem that the number of times of transfer can be reduced to suppress the occurrence of misalignment at the time of transfer, and there is no need to provide a lock device at the rail connecting portion. The object of the present invention is to provide a load transfer device between upper and lower conveyors that can simplify the configuration of the lifting device and can reduce costs.

  In order to solve the above-described problem, the load transfer device between the upper and lower conveyors according to the present invention includes an overhead conveyor that suspends and conveys an object to be conveyed by a carrier hanger that moves along the conveyance guide rail, and a conveyance guide rail. The object to be conveyed through a lifting platform that is supported by a column and driven by a lifting drive device at a predetermined transfer position between the floor conveyor that loads and conveys the object to be conveyed on a carriage that moves along A load transfer device between the upper and lower conveyors, wherein the lifting platform is positioned above and below the lower lifting platform supported by the support column, and is capable of traveling the carriage The upper and lower elevators with the guide rails mounted on the upper side, and the lower elevator and the upper elevator are at least two elevators projecting from one of them to the other The positioning pins for connection are fitted into the positioning holes for connecting the lifting platform formed on the other side, and the lifting platform coupling contact surface is formed on the upper surface of the lower lifting platform and the lower surface of the upper lifting platform. A positioning table for rail connection is installed on the floor conveyor side below the transfer location, and at the lowered position of the lifting platform, the positioning table for rail connection and the upper lifting table are projected from one of them toward the other at least 2 The rail connecting positioning pins are inserted into and connected to the rail connecting positioning holes formed on the other side, and the lower lifting platform is lowered with respect to the upper lifting platform so that the lifting platform connecting contact surfaces are connected to each other. The rail connection contact surfaces formed on the upper surface of the rail connection positioning table and the lower surface of the upper lifting table are in contact with each other, and the floor conveyor is carried in this state. In which the guide rail and the upper lifting table of the lifting guide rail is positioned in the vertical and horizontal directions.

According to the load transfer device between the upper and lower conveyors according to the present invention, an overhead conveyor that hangs and conveys an object to be conveyed by a hanger of a carrier that moves along a conveyance guide rail, and a carriage that moves along the conveyance guide rail At a predetermined transfer position between the floor conveyor on which the object to be conveyed is placed and conveyed, the object to be conveyed is delivered via a lifting platform that is supported by a support column and driven by a lifting driving device. A load transfer device between upper and lower conveyors, wherein the elevator is supported by a lower elevator supported by the support column, and an elevator guide rail on which the carriage can run is located above the lower elevator. And positioning for connecting at least two lifting platforms that project from one of the lower lifting platform and the upper lifting platform to the other. Is inserted into a positioning hole for connecting a lifting platform formed on the other side and connected, and a contact surface for coupling a lifting platform is formed on the upper surface of the lower lifting platform and the lower surface of the upper lifting platform, the predetermined transfer location A rail connection positioning table is installed on the lower floor conveyor side, and at the lowered position of the elevator table, the rail connection positioning table and the upper elevator table protrude from one of them toward the other at least two rails The connection positioning pin is inserted and connected to the rail connection positioning hole formed on the other side, and the lower lifting platform is lowered with respect to the upper lifting platform to separate the lifting platform connection contact surfaces, The rail connection contact surfaces formed on the upper surface of the rail connection positioning table and the lower surface of the upper lift table are in contact with each other, and in this state, the conveyance guide rail of the floor conveyor Since the lifting guide rails of the upper lifting platform are positioned vertically and horizontally, the conveying guide rails of the floor conveyor and the lifting guide rails of the upper lifting platform are positioned and connected along these rails. Since the carriage can be transported, a driving device that rotates or expands / contracts the support member of the transported object of the lifting platform becomes unnecessary as compared with a configuration in which only the transported object is lifted without using the lifting guide rail. Therefore, the cost can be reduced.
In addition, since the carriage is transported along the connected rails on the floor conveyor side, the number of times the transferred object is transferred when the transferred object is transferred between the overhead conveyor and the floor conveyor is the overhead conveyor. As compared with the configuration in which only the object to be transported is moved up and down without using the lifting guide rail, it is possible to suppress the occurrence of misalignment during the transfer. it can.

Furthermore, at the lowered position of the lifting platform, the rail connection positioning pins are inserted into the rail connection positioning holes and the rail connection contact surfaces are brought into contact with each other, so that the conveyance guide rail and the upper lifting platform of the floor conveyor are brought into contact with each other. Since the lift guide rails are connected in a state where they are positioned, it is not necessary to provide a locking device at the rail connecting portion, so that the cost can be reduced.
In addition, since the upper lifting platform is supported by the rail connection positioning table installed below the predetermined transfer location, the rigidity of the lifting device structure composed of the support column, the lifting platform, the lifting drive device, etc. is relatively high. While being able to make it small, it can be set as the simple structure which cantilever-supports a lifting stand with a support | pillar, Therefore The cost of a lifting apparatus can be reduced.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and all the embodiments that satisfy the requirements described in the claims are described. Is included. In the present specification, the transport direction (see arrow F in the figure) is the front, and the left and right are frontward. Moreover, let the figure seen from the left be a front view.

  1 to 7 are schematic views showing a configuration of a load transfer device between upper and lower conveyors according to an embodiment of the present invention, FIG. 1 is a front view showing the entire configuration, and FIG. 2 is an overhead conveyor to a lifting platform FIG. 3 is an enlarged front view of the main part showing a state in which the lifting platform is being lowered, FIG. 4 is an enlarged view of the main part, similarly viewed from the rear, and FIG. Fig. 6 is an enlarged front view of the main part showing a state where the elevator is lowered and the upper elevator is positioned by the rail connection positioning table, and Fig. 6 shows a connecting structure of the upper elevator, the lower elevator and the rail connection positioning table. A perspective view and FIG. 7 are explanatory drawings of a bogie lock device.

The load transfer device between the upper and lower conveyors according to the embodiment of the present invention shown in FIG. 1 uses the lifting device 3 to move the article W to be transferred at a predetermined transfer location between the overhead conveyor 1 and the floor conveyor 2. It is transferred between the upper and lower conveyors 1 and 2, and a rail connection positioning table 10 described later is provided on the floor conveyor side below the predetermined transfer location.
Here, the overhead conveyor 1 is a power chain driving device (not shown) in which the carrier 13 is supported by the hanger 14 of the carrier 13 suspended from the trolley 12 guided by the conveyance guide rail 11. The hanger 14 is opened and closed to the left and right by a conveyance drive device such as a friction roller drive device or a self-propelled travel drive device.

  The floor conveyor 2 is a power chain type (not shown) in which the carriage 23 is placed on the receiving member 24 of the carriage 23 guided by the upstream conveyance guide rail 21 or the downstream conveyance guide rail 22. It is transported by a transport drive device such as a drive device, a friction roller drive device or a self-propelled travel drive device, and the upstream transport guide rail 21 and the downstream transport guide rail 22 are separated in the front-rear direction, Between these conveyance guide rails 21 and 22, a lifting guide rail 9 attached on the upper side of an upper lifting platform 8 described later is connected.

As shown in FIG.1 and FIG.4, the raising / lowering apparatus 3 makes this this by making guide roller 5A, 5B, ... etc. follow the rail body extended in the up-down direction of the two support | pillars 4 and 4 right and left on the conveyance path | route. With such a cantilever structure, the lower lifting platform 7 is supported so as to be movable up and down, and the lifting chains 31, 31, 32, 32 having lower terminals attached to the front, rear, left and right of the lower lifting platform 7 are connected via sprockets (not shown). And a lifting / lowering drive device that winds or unwinds, a counterweight 33 for gravity compensation, and the like.
As shown in FIGS. 2 and 6, the lifting platform 6 is provided with a lower lifting platform 7 and a lifting guide rail 9 that is located above the lower lifting platform 7 and on which the carriage 23 can travel in the front-rear direction. On the left side of the rear frame of the lower lifting platform 7 and the right side of the front frame, there are mounted lifting platform connecting positioning pins 15 and 16 projecting upward. On the rear side of the lower surface of the left frame of the upper elevator table 8 and the front surface of the lower surface of the right frame, the intermediate parts of the left and right frames extending in the front-rear direction are connected to the left and right frames. Positioning holes 17 and 18 for connecting the lifting platform are formed.
Further, contact surfaces 19A, 19A for connecting the lift base are provided on the left side of the front frame and the right side of the rear frame of the lower lift base 7, and the lift base connection contact is provided around the lift base connection positioning pins 15, 16. The contact surfaces 19B, 19B are on the lower front side of the left frame of the upper elevator platform 8 and on the lower rear side of the right frame, and the elevator platform connection contact surfaces 20A, 20A are around the elevator platform connection positioning holes 17, 18 respectively. Are formed so that the upper and lower contact surfaces 19A, 20A and 19B, 20B are in contact with each other.

Therefore, the positioning pins 15 and 16 for connecting the lifting platform of the lower lifting platform 7 are fitted into the positioning holes 17 and 18 for coupling the lifting platform of the upper lifting platform 8, and the upper and lower lifting platform connection contact surfaces 19A, 20A and 19B, In a state where 20B are in contact with each other (see, for example, FIG. 2), the lower lifting platform 7 and the upper lifting platform 8 are connected in a state where they are positioned in the horizontal plane and in the vertical direction.
Here, the lower lifting platform 7 and the upper lifting platform 8 are connected only by fitting the lifting platform connection positioning pins 15, 16 and the lifting platform connection positioning holes 17, 18. As shown, the chains 34 and 34 attached to the upper lifting platform 8 are gently wound around the front and rear frames of the lower lifting platform 7, so that the lower lifting platform 7 and the upper lifting platform 8 do not come off.
It should be noted that a positioning pin for connecting a lifting base that protrudes downward may be attached to the upper lifting platform 8 so as to be fitted into a positioning hole for lifting platform connection formed on the upper surface of the lower lifting platform 7. The number of pedestal connecting positioning pins is not limited to two, and may be two or more.

Next, with reference to FIG.5 and FIG.6, the positioning of the upper raising / lowering stand 8 (elevation guide rail 9) by the rail connection positioning stand 10 is demonstrated.
For example, rail connection positioning pins 25 and 26 projecting upward are attached to the left side of the rear frame and the right side of the front frame of the rail connection positioning base 10 having a substantially box-shaped frame. Rail connection positioning pins 25 and 26 are fitted further to the rear side of the frame lower-side rear lifting platform connection positioning hole 17 and further to the front side of the lower-right front surface of the right frame. Rail connection positioning holes 27 and 28 are formed.
Further, rail connection contact surfaces 29A and 29A are provided on the left side of the front frame and the right side of the rear frame of the rail connection positioning base 10, and rail connection contact is provided around the rail connection positioning pins 25 and 26. The surfaces 29B and 29B are further on the front side of the lower frame front contact surface 20A on the lower surface of the upper lifting platform 8 and on the rear side of the lower frame rear surface of the right frame and further on the rear surface of the right frame. Rail connection contact surfaces 30A and 30A, and rail connection contact surfaces 30B and 30B around the rail connection positioning holes 27 and 28, and upper and lower contact surfaces 29A, 30A and 29B, 30B. Are formed so as to contact each other.

Therefore, the rail connection positioning pins 25 and 26 of the rail connection positioning base 10 are fitted into the rail connection positioning holes 27 and 28 of the upper elevating base 8, and the upper and lower rail connection contact surfaces 29A, 30A and 29B, 30B are inserted. In the state in which they are in contact with each other (see FIG. 5), the upper lifting platform 8 is positioned in the horizontal plane and in the vertical direction by the rail connection positioning platform 10, and in this positioning state, the lifting platform attached to the upper lifting platform 8 is moved up and down. The guide rail 9 is connected to the upstream side conveyance guide rail 21 and the downstream side conveyance guide rail 22 of the floor conveyor 2 shown in FIG.
Note that a rail connection positioning pin that protrudes downward may be attached to the upper lift 8 and may be configured to fit into a rail connection positioning hole formed on the upper surface of the rail connection positioning base 10. The number of connection positioning pins is not limited to two, and may be two or more.

When performing positioning using such a rail connection positioning table 10, the lower lifting platform 7 is lowered with respect to the upper lifting platform 8 as shown in FIG. Since 19B and 20B are separated from each other, the upper and lower rail connection contact surfaces 29A and 30A and 29B and 30B can be reliably brought into contact with each other to perform vertical positioning.
Further, as shown in FIG. 5, even if the lifting pins coupling positioning pins 15 and 16 of the lower lifting platform 7 are still fitted in the lifting platform coupling positioning holes 17 and 18 of the upper lifting platform 8, Is supported by the support columns 4 and 4 via the guide rollers 5A, 5B,..., Etc., with respect to the rail connection positioning table 10 which can be firmly fixed to the rails and can easily secure the necessary and sufficient rigidity. Since the horizontal rigidity at the position of the base 7 is sufficiently low, the rail connection positioning pins 25 and 26 of the rail connection positioning base 10 are fitted in the rail connection positioning holes 27 and 28 of the upper lift base 8. Since the horizontal force acting on the upper lifting platform 8 from the lower lifting platform 7 and the columns 4 and 4 is very small, the upper lifting platform 8 and the lifting guide rail 9 on the upper side thereof are leveled by the rail connection positioning platform 10. It is reliably positioned within.

Next, the cart locking device 36 for fixing the cart 23 delivered on the lifting guide rail 9 of the upper lifting platform 8 will be described.
As shown in FIGS. 2 and 7, a fixing vertical piece 35 projects downward from the center lower surface of the base of the carriage 23, and a carriage lock device 36 is attached to the upper elevator 8.
The front and rear holding members 37 and 38 of the carriage locking device 36 rotate around the left and right support shafts 39 and 40, and the spur gears 41 and 40 attached to the holding members 37 and 38 coaxially with the support shafts 39 and 40. The tip of the piston rod 46 of a cylinder 45 that is, for example, an air cylinder or an electric cylinder is connected to an arm portion 43 engaged with 42 and extending downward of one of the clamping members 37 through a connecting shaft 44.

Therefore, by extending the piston rod 46 of the cylinder 45 (see the arrow A in FIG. 7) in a state where the carriage 23 is delivered on the lifting guide rail 9 of the upper lifting platform 8, the clamping members 37, 38 are Since the rollers 37A and 38A at the leading ends can be closed so as to sandwich the front and rear surfaces of the fixing vertical piece 35 (see arrows B and C in FIG. 7), the carriage 23 is fixed on the lifting guide rail 9. be able to.
Further, by retracting the piston rod 46 of the cylinder 45, the sandwiching members 37, 38 can be opened so that the rollers 37A, 38A at the leading ends thereof are separated from the front and rear surfaces of the fixing vertical piece 35. The state where 23 is fixed on the lifting guide rail 9 can be released, and the carriage can be transferred from the lifting guide rail 9 to the downstream conveyance guide rail 22.

Next, with respect to a series of operations when delivering the conveyed object W between the overhead conveyor 1 and the floor conveyor 2, an example of a case where the conveyed object W is delivered from the overhead conveyor 1 side to the floor conveyor 2 side. I will explain to you.
First, at a predetermined transfer location between the overhead conveyor 1 and the floor conveyor 2 shown in FIG. 1, the elevator 6 is lowered by the elevator drive device, and the positioning using the rail connection positioning table 10 is performed, as shown in FIG. The lift guide rail 9 as shown is positioned with the upstream side conveyance guide rail 21 and the downstream side conveyance guide rail 22 of the floor conveyor 2, and these rails 21, 9, and 22 are connected. Note that FIG. 5 does not show the upstream conveyance guide rail 21 and the downstream conveyance guide rail 22.
Next, the front and rear clamping pieces 37 and 38 (see FIG. 7) of the carriage locking device 36 are opened, and the transported object W is not placed on the lift guide rail 9 from the upstream transport guide rail 21. After the carriage 23 is carried in by the transport driving device, the holding pieces 37 and 38 are closed, the empty carriage 23 is fixed on the lifting guide rail 9, and the lifting platform 6 is raised by the lifting drive device in this state.

In addition, the carrier 13 that has been transported by the transport driving device of the overhead conveyor 1 stops at the predetermined transfer location and stands by.
Therefore, the transported object W supported by the hanger 14 is received by the receiving members 24 of the empty carriage 23 that has been lifted while being positioned and fixed to the upper lift 8 (lift guide rail 9) as described above. By being pushed up in the state, the conveyed object W is placed on the carriage 23.
Next, the hanger 14 is opened in the left-right direction, the lifting platform 6 is lowered by the lifting drive device, and the lifting guide rail 9 as shown in FIG. The upstream conveyance guide rail 21 and the downstream conveyance guide rail 22 are positioned, and the rails 21, 9, and 22 are connected.
In this state, the front and rear clamping pieces 37 and 38 (see FIG. 7) of the carriage lock device 36 are opened, and the carriage 23 is received from the lift guide rail 9 onto the downstream conveyance guide rail 22 by the conveyance drive device. hand over.
Similarly to the operation of delivering the object to be conveyed W from the overhead conveyor 1 side to the floor conveyor 2 side, the operation of delivering the object to be conveyed W from the floor conveyor 2 side to the overhead conveyor 1 side can be easily performed. .

According to the load transfer device between the upper and lower conveyors as described above, the transport guide rails 21 and 22 of the floor conveyor 2 and the lift guide rail 9 of the upper lift platform 8 are positioned and connected to each other. Since the carriage 23 can be conveyed by the conveyance drive device along the lines 21, 9, and 22, compared to the configuration in which only the article W is moved up and down without using the lifting guide rail 9, the carriage is transported to the lifting platform 6. Since it is not necessary to provide a drive device that rotates or expands / contracts the support member of the object W, the cost can be reduced.
Further, since the carriage 23 is transported along the connected rails 21, 9 or 9, 22 on the floor conveyor 2 side, when the article W is transferred between the overhead conveyor 1 and the floor conveyor 2. Since the number of times of transfer of the transported object W is only one transfer between the overhead conveyor 1 and the lifting platform 6 (empty carriage 23), only the transported object W is used without using the lifting guide rail 9. As compared with the configuration for raising and lowering, it is possible to suppress the occurrence of misalignment during transfer.

Further, the rail connection positioning pins 25 and 26 are fitted into the rail connection positioning holes 27 and 28 so that the rail connection contact surfaces 29A, 30A and 29B, 30B are brought into contact with each other at the lowered position of the lifting platform 6. Since the transport guide rails 21 and 22 of the floor conveyor 2 and the lifting guide rail 9 of the upper lifting platform 8 are connected in a positioned state, there is no need to provide a locking device at the rail connecting portion, thereby reducing the cost. Can be reduced.
Furthermore, since the upper lifting platform 8 is supported by the rail connection positioning table 10 installed below the predetermined transfer location, the lifting device 3 composed of the columns 4, 4 and the lifting platform 6, the lifting drive device, etc. The rigidity of the structure can be made relatively small, and since the elevating platform 6 (lower elevating platform 7) cantilevered by the support columns 4 and 4, the cost of the elevating device 3 can be reduced. can do.

It is a front view which shows the whole structure of the load transfer apparatus between the upper and lower conveyors concerning embodiment of this invention. It is a principal part enlarged front view which shows the state which transferred the to-be-conveyed object on the lifting platform from the overhead conveyor. It is a principal part enlarged front view which shows the state in the middle of the descent | fall of a lifting platform. It is the principal part enlarged view similarly seen from back. It is a principal part enlarged front view which shows the state which lowered the elevator and positioned the upper elevator with the positioning table for rail connection. It is a perspective view which shows the connection structure of an upper raising / lowering stand, a lower raising / lowering stand, and a positioning table for rail connection. It is explanatory drawing of a trolley | bogie lock apparatus.

Explanation of symbols

F Transport direction W Conveyed object 1 Overhead conveyor 2 Floor conveyor 3 Lifting device 4 Post 6 Lifting platform 7 Lower lifting platform 8 Upper lifting platform 9 Lifting guide rail 10 Rail connection positioning table 11 Transporting guide rail 13 Carrier 14 Hangers 15 and 16 Lifting table connecting positioning pins 17, 18 Lifting table connecting positioning holes 19A, 19B, 20A, 20B Lifting table connecting contact surface 21 Upstream conveying guide rail 22 Downstream conveying guide rail 23 Carriage 24 Receiving member 25, 26 Rail Connection positioning pins 27, 28 Rail connection positioning holes 29A, 29B, 30A, 30B Rail connection contact surfaces 31, 32 Lifting chain

Claims (1)

An overhead conveyor that hangs and conveys the object to be conveyed by a carrier hanger that moves along the conveyance guide rail, and a floor conveyor that conveys the object to be conveyed on a carriage that moves along the conveyance guide rail. A load transfer device between the upper and lower conveyors that delivers the object to be conveyed through a lifting platform that is supported by a support column and driven by a lifting drive device to move up and down at a predetermined transfer location between,
The lifting platform is constituted by a lower lifting platform supported by the support column, and an upper lifting platform that is positioned on the upper side of the lower lifting platform and on which a lifting guide rail on which the carriage can travel is attached. The lower lifting platform and the upper lifting platform are connected by inserting into at least two lifting platform connecting positioning pins formed on the other, and connecting at least two lifting platform connecting positioning pins projecting from one to the other. A contact surface for connecting the lifting platform is formed on the upper surface of the lower lifting platform and the lower surface of the upper lifting platform,
A rail connection positioning stand is installed on the floor conveyor side below the predetermined transfer location,
In the lowered position of the lifting platform, the rail connection positioning table and the upper lifting platform are formed in a rail connection positioning hole in which at least two rail connection positioning pins projecting from one to the other are formed on the other. Inserting and connecting, lowering the lower lifting platform with respect to the upper lifting platform to separate the contact surfaces for connecting the lifting platform, the upper surface of the rail connection positioning table and the lower surface of the upper lifting platform The rail connection contact surfaces formed on the upper and lower conveyors are positioned in the vertical and horizontal directions in this state. Load transfer device.

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