Unit suspension device, overhead lift conveyor and overhead lift conveyor installation

Abstract

The invention provides a unit suspension device, an overhead hoist conveyor and an overhead hoist conveyor facility. A unit suspension device according to an embodiment of the present disclosure includes: a through hole formed in a lifting body of a lifting unit; and a suspension unit formed in a hand unit suspended on a lifting belt of the lifting unit and having a suspension pin passing through the through hole and suspended on the lifting body such that the hand unit is suspended on the lifting unit.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0153393 filed in the Korean Intellectual Property Office on November 8, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure relates to a unit suspension device, an overhead lift conveyor, and an overhead lift conveyor facility for use in a facility for manufacturing semiconductors. Background Art

[0004] In facilities for manufacturing semiconductors, substrates stored in storage containers can typically be loaded into closed carrier boxes, such as front opening unified pods (FOUPs), front opening shipping boxes (FOSBs), storage boxes, etc., or loaded into open carrier boxes, such as cassettes, etc.

[0005] The cassettes can be transported by an Overhead Hoist Transporter (OHT) that travels along tracks mounted on the ceiling.

[0006] However, in order for the overhead lifting conveyor to carry the hand unit while traveling, a stall torque may be generated in which the load of the hand unit and the load of the carrier box are supported by the lifting belt.

[0007] In order to support the stall torque, the requirements for the motor may be high in some cases, but when supporting a high load for a long time, degradation may occur due to the high load factor.

[0008] Specifically, when the overhead lift transporter is traveling, the hand unit may be in a lifted state, and the load of the hand unit and the load of the carrying box may be supported by the lifting belt during the traveling. At this time, a stall torque may be generated in the lifting motor of the lifting unit, and when the overhead lift transporter is traveling for a long time while carrying the carrying box, it may be degraded due to the load. Summary of the invention

[0009] One aspect of the present disclosure provides a unit suspension device configured to suspend a hand unit on a lifting unit, an overhead lifting transporter, and an overhead lifting transporter facility.

[0010] According to one aspect of the present disclosure, the unit suspension device includes: a through hole formed in a lifting body of the lifting unit; and a hanging unit formed in a hand unit suspended on a lifting belt of the lifting unit and having a hanging pin, the hanging pin passing through the through hole and being hung on the lifting body, so that the hand unit is hung on the lifting unit.

[0011] The through hole can be vertically arranged, and the hanging unit may include: the hanging pin, which is vertically arranged on the upper side of the hand unit; and a driving member, which is mounted on the hand unit and connected to the hanging pin to rotate the hanging pin, and when the hanging pin rotates and descends after passing through the through hole, the hanging pin is hung on the upper edge of the through hole.

[0012] The suspension pin may include: a pin body formed in a cylindrical shape; and a pin head formed on an upper end portion of the pin body and formed to extend more laterally than the pin body.

[0013] The through hole may have a cross-sectional shape that allows the pin head to pass through but prevents the pin head from passing through in the opposite direction after passing through and rotating.

[0014] The pin head may be formed to taper in an upward direction.

[0015] The suspension unit may further include a guide member installed in a lower portion of the through hole in the lifting body and having a guide hole guiding the suspension pin to the through hole.

[0016] An inner space of a lower opening of the guide hole may be formed to expand in a downward direction to guide the introduction of the suspension pin.

[0017] The suspension unit may further include a stopper formed on the lifting body to restrict rotation of the suspension pin.

[0018] The suspension unit may also include a connecting bracket connecting the suspension pin and the hand unit, wherein the connecting bracket includes: a bracket body installed in the hand unit and having a bracket hole formed for the suspension pin to pass through; and a bearing installed in the bracket hole and the suspension pin can be rotatably connected to the bearing.

[0019] The through holes may be provided as a plurality of through holes which may be provided at predetermined intervals from each other in the lifting body, and the suspension units may be provided as a plurality of suspension units which may be provided at predetermined intervals from each other on the hand unit to correspond to the plurality of through holes.

[0020] According to another aspect of the present disclosure, an overhead lifting transporter includes: a traveling unit; a lifting unit mounted on the traveling unit and having a lifting belt; a hand unit suspended on the lifting belt; and a unit suspension device formed in the lifting unit and the hand unit so that the hand unit is suspended on the lifting unit, wherein the unit suspension device includes: a through hole formed in a lifting body of the lifting unit; and a suspension unit having a suspension pin, which is formed in the hand unit, passes through the through hole and is suspended on the lifting body.

[0021] According to another aspect of the present disclosure, an overhead lifting transport facility includes: a track installed on a ceiling; and an overhead lifting transport arranged on the track, wherein the overhead lifting transport includes: a traveling unit traveling along the track; a lifting unit installed on the traveling unit and having a lifting belt; a hand unit suspended on the lifting belt; and a unit hanging device formed in the lifting unit and the hand unit so that the hand unit is suspended on the lifting unit, wherein the unit hanging device includes: a through hole formed in a lifting body of the lifting unit; and a hanging unit having a hanging pin, the hanging pin being formed in the hand unit, passing through the through hole and hanging on the lifting body, wherein the hanging unit includes: the hanging pin being vertically arranged on the upper side of the hand unit; a driving member installed on the hand unit and connected to the hanging pin to rotate the hanging pin, and a connecting bracket connecting the hanging pin and the hand unit, and wherein when the hanging pin rotates and descends after passing through the through hole, the hanging pin is hung on the upper edge of the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other aspects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a diagram illustrating an overhead lift conveyor facility according to an embodiment of the present disclosure.

[0024] Figure 2 and Figure 3 yes Figure 1 Magnified view of the unit suspension device during the lowering and raising of the hand unit in the overhead lift transport facility.

[0025] Figures 4 to 6 It is shown Figure 2 and Figure 3 Cross-sectional view of the rotation, lowering and suspension of the suspension pin in the unit suspension device.

[0026] Figure 7 It is shown Figure 2 FIG. 4 is a diagram of a process in which a hand unit is raised and then hung on a lifting unit.

[0027] Figure 8 It is shown Figure 3 FIG. 4 is a diagram of a process in which a hand unit is released from a lifting unit and then descends. DETAILED DESCRIPTION

[0028] Hereinafter, the preferred embodiments will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. However, when describing the preferred embodiments of the present disclosure in detail, when it is determined that the detailed description of the relevant known functions or configurations may unnecessarily confuse the subject matter of the present disclosure, the detailed description will be omitted. In addition, throughout the drawings, the same figure marks may be used for parts with similar functions and effects. In addition, in this specification, terms such as "on...", "upper part", "upper surface", "below", "lower part", "lower surface", "side surface" and the like may be based on the drawings, and depending on the direction in which the components are set, the components may actually change.

[0029] In addition, throughout the specification, when a part is "connected" to other parts, it can be "directly connected" to other parts, and can also be "indirectly connected" to other components between them. In addition, unless otherwise specified, "comprising" a specific component means that other components can also be included without excluding other components.

[0030] Figure 1 is a diagram showing an overhead lifting transport facility according to an embodiment of the present disclosure, Figure 2 and Figure 3 yes Figure 1 an enlarged view of the unit suspension device when the hand unit is lowered and raised in the overhead lift transport facility, and Figures 4 to 6 It is shown Figure 2 and Figure 3 Cross-sectional view of the rotation, lowering and suspension of the suspension pin in the unit suspension device.

[0031] 1. Referring to the drawings, an overhead lifting conveyor facility according to an embodiment of the present disclosure may include a track R and an overhead lifting conveyor 1000.

[0032] The track R may be installed on the ceiling of a semiconductor manufacturing line. In order to manufacture semiconductors, many substrate processing processes need to be performed. In order to perform these many substrate processing processes, many movements of the substrate may be required between each process, and therefore, the track R may be installed for this purpose. The track R may provide a travel path for the overhead lifting transport 1000, and, in this case, the travel path may include a straight path and a curved path.

[0033] The overhead lifting transporter 1000 may be disposed on a track R and may move along the track R. As shown in FIG.

[0034] Specifically, the overhead lift transporter 1000 may include a travel unit 100 , a lift unit 200 , a hand unit 300 , and a unit suspension device 400 .

[0035] The travel unit 100 may be configured to travel along a track R, and may travel on the track R by rotation of driving wheels 101 attached to both side portions of the track R, respectively.

[0036] In addition, the lifting unit 200 may be installed below the traveling unit 100, and may have a lifting belt 220. For example, in the lifting unit 200, the lifting belt 220 may be wound, and when the lifting unit 200 is in operation, the lifting belt 220 may be unwound or wound.

[0037] In addition, the hand unit 300 may be configured to clamp the carrier 1 such as a FOUP on which the substrate is loaded. The hand unit 300 may be provided to be suspended on the lifting belt 220 of the lifting unit 200. Since the lifting belt 220 of the lifting unit 200 may be wound and unwound, the hand unit 300 may be raised and lowered.

[0038] The unit suspension device 400 may be formed in the lifting unit 200 and the hand unit 300 .

[0039] In this case, the unit hanging device 400 may be configured to hang the hand unit 300 on the lifting unit 200 .

[0040] The unit suspension device 400 may include a through hole 410 and a suspension unit 420 .

[0041] The through hole 410 may be formed in the lifting body 210 of the lifting unit 200. The through hole 410 may be configured to be formed in the lifting body 210 vertically.

[0042] In addition, the hanging unit 420 may be formed on the hand unit 300 , and may include a hanging pin 421 .

[0043] The hanging pin 421 may be configured to pass through the through hole 410 to be hung on the lifting body 210 , so that the hand unit 300 is hung by the lifting unit 200 .

[0044] Specifically, the suspension unit 420 may include the above-mentioned suspension pin 421 and the driving member 422 .

[0045] The hanging pin 421 may be vertically disposed at the upper side of the hand unit 300. For example, the hanging pin 421 may be configured to be vertically disposed to correspond to the through hole 410 vertically formed in the lifting body 210.

[0046] In addition, the driving member 422 may be mounted on the hand unit 300, and may be configured to be connected to the suspension pin 421 and rotate the suspension pin 421. For example, the driving member 422 may be connected to the lower end portion of the suspension pin 421, and the suspension pin 421 may be rotated when the driving member 422 operates. In this case, in the driving member 422, the driving shaft 422a may be connected to the lower end portion of the suspension pin 421 through the connector C. Furthermore, the driving member 422 may use a driving motor, but is not limited thereto, and any conventional configuration may be used as long as it may be a driving source capable of rotating the suspension pin 421.

[0047] The hanging pin 421 passes through the through hole 410 , rotates, and then descends while being hung on the upper edge of the through hole 410 .

[0048] Specifically, the suspension pin 421 may include a pin body 421 a and a pin head 421 b .

[0049] The pin body 421 a may be formed in a cylindrical shape.

[0050] In addition, the pin head 421 b may be formed on an upper end portion of the pin body 421 a , and may be configured to be formed to extend more laterally than the pin body 421 a .

[0051] In addition, the through hole 410 may have a cross-sectional area through which the pin head 421b passes, and have a cross-sectional area corresponding to the cross-sectional area of ​​the pin head 421b, so that when the pin head 421b passes through the through hole 410 and rotates and then descends, the pin head 421b cannot pass through the through hole 410. That is, the through hole 410 has a cross-sectional shape that allows the pin head 421b to pass through but prevents the pin head 421b from passing in the opposite direction after passing through and rotating.

[0052] For example, the through hole 410 may be formed in a shape corresponding to the cross section of the pin head 421 b , and may be formed to be relatively long in one direction horizontally and relatively short in another direction perpendicular to the one direction.

[0053] As a result, the pin head 421b of the suspension pin 421 can pass through the through hole 410, so that the suspension pin 421 can smoothly rise and fall through the through hole 410. In addition, due to the structure of the through hole 410 described above, when the pin head 421b passes through the through hole 410, rotates, and then falls, the pin head 421b may not pass through the through hole 410 and may be suspended on the upper edge of the through hole 410.

[0054] In this case, the insertion of the suspension pin 421 into the through hole 410 can be achieved by winding the lifting belt 220 of the lifting unit 200 to lift the hand unit 300. In addition, the rotation of the suspension pin 421 can be achieved by operating the driving member 422. Furthermore, the lowering of the suspension pin 421 can be achieved by loosening the lifting belt 220 of the lifting unit 200 to lower the hand unit 300.

[0055] In addition, the pin head 421b may be configured to be formed to taper in an upward direction. As an example, as shown in the figure, the pin head 421b may have an upwardly curved shape, that is, an upwardly convex shape.

[0056] Thus, when the pin head 421 b is inserted into the through hole 410 to pass through the through hole 410 , the pin head 421 b may be easily inserted into the through hole 410 due to the above-described structure.

[0057] In addition, the suspension unit 420 may further include a guide member 425 .

[0058] The guide member 425 may be installed in the lower portion of the through hole 410 in the lifting body 210, and may have a guide hole 425a that guides the suspension pin 421 to the through hole 410. In a state where the suspension pin 421 is located spaced apart from the lower side of the through hole 410, when the suspension pin 421 is inserted into the through hole 410, the suspension pin 421 may be guided by the guide member 425 located between the suspension pin 421 and the through hole 410 to reach the through hole 410.

[0059] In addition, the inner space of the lower opening 425b of the guide hole 425a may be formed to expand in the downward direction to guide the introduction of the suspension pin 421. As a result, when the suspension pin 421 is inserted into the through hole 410 to pass through the through hole 410, the suspension pin 421 can be easily inserted into the through hole 410 due to the above-described structure.

[0060] The suspension unit 420 may further include a stopper 423 .

[0061] The stopper 423 may be formed on the lifting body 210 to limit the rotation of the hanging pin 421. The stopper 423 may be formed at a specific position of the rotation path of the hanging pin 421 in the lifting body 210, so that the hanging pin 421 can rotate at a specific angle, and the rotation of the hanging pin 421 can be stopped by the stopper 423. For example, the stopper 423 may be located at a position where the rotation of the hanging pin 421 is stopped after the hanging pin 421 rotates at an angle of 90 degrees, so that the rotation can be stopped at a position where the hanging pin 421 is hung on the upper edge of the through hole 410.

[0062] In addition, the suspension unit 420 may further include a connection bracket 424 .

[0063] The connection bracket 424 may be configured to connect the suspension pin 421 and the hand unit 300 .

[0064] The suspension pin 421 may receive the load of the hand unit 300, and the load may be transferred through the connection bracket 424 instead of being transferred through the driving member 422. For example, since the load of the hand unit 300 may be transferred to the suspension pin 421 through the connection bracket 424, the load transfer of the hand unit 300 may be achieved through a strong structure.

[0065] In this case, the connection bracket 424 may include a bracket body 424a and a bearing 424b.

[0066] The bracket body 424a may be installed in the hand unit 300, and may form a bracket hole through which the suspension pin 421 passes. In addition, a bearing 424b may be installed in the bracket hole, and the suspension pin 421 may be rotatably connected to the connection bracket 424.

[0067] In this manner, the suspension pin 421 may be connected to the bracket body 424 a through the bearing 424 b to be rotatable while being firmly connected to the connection bracket 424 .

[0068] In addition, in the structure as described above, the through hole 410 can be set as a plurality of through holes, and the plurality of through holes can be arranged at predetermined intervals from each other in the lifting body 210, and the suspension unit 420 can be set as a plurality of suspension units, and the plurality of suspension units can be arranged at predetermined intervals from each other on the hand unit 300 to correspond to the plurality of through holes 410.

[0069] Due to the plurality of through holes 410 and the plurality of hanging units 420 , the hand unit 300 has a relatively large size compared to the hanging units 420 , and thus may be stably and firmly hung on the lifting unit 200 .

[0070] Figure 7 It is shown Figure 2 A diagram of the process in which the hand unit is raised and then hung on the lifting unit, and Figure 8 It is shown Figure 3 FIG. 4 is a diagram of a process in which a hand unit is released from a lifting unit and then descends.

[0071] Below, we will refer to Figure 7 The process of hanging the hand unit 300 on the lifting unit 200 after the hand unit 300 clamps the carrying box 1 and before the carrying box 1 is transported is described.

[0072] First, as shown in the first and second figures from the left, when the lifting belt 220 of the lifting unit 200 is wound to lift the hand unit 300, the hanging pin 421 may be inserted into the through hole 410.

[0073] Thereafter, as shown in the third figure from the left, the suspension pin 421 may continue to rise so that the pin head 421 b rises to be slightly higher than the upper edge of the through hole 410 located at the suspension height.

[0074] Next, as shown in the fourth figure from the left, the hanging pin 421 may be rotated counterclockwise by the driving member 422 , so that the hanging pin 421 rotates to a position where the pin head 421 b can be hung on the upper edge of the through hole 410 .

[0075] Finally, as shown in the fifth drawing from the left, when the lifting belt 220 of the lifting unit 200 is loosened to lower the hand unit 300, the hanging pin 421 may be hung on the upper edge of the through hole 410 located at the hanging height.

[0076] Below, we will refer to Figure 8 A process of releasing the hand unit 300 from the lifting unit 200 after the hand unit 300 transports the carrier box 1 and before putting down the carrier box 1 is described.

[0077] First, as shown in the first and second figures from the left, when the lifting belt 220 of the lifting unit 200 is wound to slightly raise the hand unit 300, the hanging pin 421 may be slightly lifted from the upper edge of the through hole 410 to enter a released state.

[0078] Then, as shown in the third figure from the left, the suspension pin 421 may be rotated clockwise by the driving member 422 so that the pin head 421 b moves to a position corresponding to the through hole 410 .

[0079] Finally, as shown in the fourth and fifth figures from the left, when the lifting belt 220 of the lifting unit 200 is loosened to allow the hand unit 300 to descend, the hanging pin 421 may be withdrawn from the through hole 410 .

[0080] As a result, the present disclosure may include a suspension unit 420 having a suspension pin 421 suspended on the lifting body 210, thereby suspending the hand unit 300 through the lifting unit 200 to prevent the lifting motor of the lifting unit 200 from being driven, thereby eliminating the load of the stall torque of the lifting motor. In turn, the deterioration of the lifting motor can be prevented, and the requirements of the lifting motor can be reduced to reduce costs.

[0081] Furthermore, since the suspension pin 421 of the suspension unit 420 of the present disclosure can be replaced with a conventional alignment pin for aligning the hand unit 300 relative to the lifting unit 200 , the suspension pin 421 can play a role in aligning the hand unit 300 as well as suspending the hand unit 300 .

[0082] The present invention may include a suspension unit having a suspension pin suspended on the lifting body, so that the hand unit is suspended by the lifting unit to prevent the lifting motor of the lifting unit from being driven, thereby eliminating the load of the stall torque of the lifting motor. In turn, the deterioration of the lifting motor can be prevented, and the requirements of the lifting motor can be reduced to reduce costs.

[0083] Furthermore, since the suspension pin of the suspension unit of the present disclosure can be replaced with a conventional alignment pin for aligning the hand unit relative to the lifting unit, the suspension pin can play the role of aligning the hand unit as well as the role of suspending the hand unit.

[0084] While exemplary embodiments have been illustrated and described above, it will be apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A unit suspension device, comprising: a through hole formed in a lifting body of the lifting unit; as well as A hanging unit is formed in the hand unit hung on the lifting belt of the lifting unit and has a hanging pin which passes through the through hole and is hung on the lifting body so that the hand unit is hung on the lifting unit.

2. The unit suspension device according to claim 1, wherein: The through hole is arranged vertically, The suspension unit comprises: the suspension pin being vertically disposed on an upper side of the hand unit; and a driving member mounted on the hand unit and connected to the suspension pin to rotate the suspension pin, and When the suspension pin rotates and descends after passing through the through hole, the suspension pin is suspended on the upper edge of the through hole.

3. The unit suspension device according to claim 2, wherein: The suspension pin comprises: a pin body formed in a cylindrical shape; and A pin head is formed on an upper end portion of the pin body and is formed to extend laterally more than the pin body.

4. The unit suspension device according to claim 3, wherein: The through hole has a cross-sectional shape that allows the pin head to pass through but prevents the pin head from passing through in the opposite direction after passing through and rotating.

5. The unit suspension device according to claim 3, wherein: The pin head is formed to be gradually tapered in an upward direction.

6. The unit suspension device according to claim 2, wherein: The suspension unit further includes a guide member installed in a lower portion of the through hole in the lifting body and having a guide hole guiding the suspension pin to the through hole.

7. The unit suspension device according to claim 6, wherein: An inner space of a lower opening of the guide hole is formed to expand in a downward direction to guide the introduction of the suspension pin.

8. The unit suspension device according to claim 2, wherein: The suspension unit further includes a stopper formed on the lifting body to restrict rotation of the suspension pin.

9. The unit suspension device according to claim 2, wherein: The suspension unit further includes a connecting bracket, the connecting bracket connecting the suspension pin and the hand unit, Wherein, the connecting bracket comprises: a bracket body installed in the hand unit and having a bracket hole formed so that the suspension pin passes therethrough; and A bearing is mounted in the bracket hole, and the suspension pin is rotatably connected to the bearing.

10. The unit suspension device according to claim 2, wherein: The through hole is provided as a plurality of through holes, and the plurality of through holes are provided in the lifting body at predetermined intervals from each other, and The hanging unit is provided as a plurality of hanging units, and the plurality of hanging units are disposed on the hand unit at predetermined intervals from each other to correspond to the plurality of through holes.

11. An overhead lifting transporter comprising: Travel unit; A lifting unit, mounted on the travel unit and having a lifting belt; a hand unit suspended on the lifting belt; as well as a unit suspension device formed in the lifting unit and the hand unit so that the hand unit is suspended on the lifting unit, Wherein, the unit suspension device comprises: a through hole formed in a lifting body of the lifting unit; and A hanging unit has a hanging pin formed in the hand unit, passing through the through hole and hung on the lifting body.

12. The overhead lifting transport of claim 11, wherein: The suspension unit comprises: the suspension pin being vertically disposed on an upper side of the hand unit; and a driving member mounted on the hand unit and connected to the suspension pin to rotate the suspension pin, and When the suspension pin rotates and descends after passing through the through hole, the suspension pin is suspended on the upper edge of the through hole.

13. The overhead lifting transport of claim 12, wherein: The suspension pin comprises: a pin body formed in a cylindrical shape; and a pin head formed on an upper end portion of the pin body and formed to extend more laterally than the pin body.

14. The overhead lifting transport of claim 13, wherein: The through hole has a cross-sectional shape that allows the pin head to pass through but prevents the pin head from passing through in the opposite direction after passing through and rotating.

15. The overhead lifting transport of claim 13, wherein: The pin head is formed to be gradually tapered in an upward direction.

16. The overhead lift transport of claim 12, wherein: The suspension unit also includes a guide member installed in a lower portion of the through hole in the lifting body and having a guide hole for guiding the suspension pin to the through hole, and an inner space of a lower opening of the guide hole is formed to expand in a downward direction to guide the introduction of the suspension pin.

17. The overhead lift transport of claim 12, wherein: The suspension unit further includes a stopper formed on the lifting body to restrict rotation of the suspension pin.

18. An overhead lifting transport facility comprising: Track, mounted on the ceiling; as well as an overhead lifting transport, disposed on said track, Wherein, the overhead lifting transporter comprises: A traveling unit, traveling along the track; A lifting unit, mounted on the travel unit and having a lifting belt; a hand unit suspended from the lifting belt; and a unit suspension device formed in the lifting unit and the hand unit so that the hand unit is suspended on the lifting unit, Wherein, the unit suspension device comprises: a through hole formed in a lifting body of the lifting unit; and a hanging unit having a hanging pin formed in the hand unit, passing through the through hole and hanging on the lifting body, Wherein, the suspension unit comprises: The suspension pin is vertically disposed on the upper side of the hand unit; a driving member mounted on the hand unit and connected to the suspension pin to rotate the suspension pin, and a connecting bracket connecting the suspension pin and the hand unit, and Wherein, when the suspension pin rotates and descends after passing through the through hole, the suspension pin is suspended on the upper edge of the through hole.

19. The overhead lift conveyor facility of claim 18, wherein: The suspension pin comprises: a pin body formed in a cylindrical shape; and a pin head formed on an upper end portion of the pin body and formed to extend laterally further than the pin body, The through hole has a cross-sectional shape that allows the pin head to pass through, but prevents the pin head from passing through in the opposite direction after passing through and rotating.

20. The overhead lift conveyor facility of claim 19, wherein: The pin head is formed to taper gradually in an upward direction, wherein the suspension unit further comprises a guide member installed in a lower portion of the through hole in the lifting body and having a guide hole for guiding the suspension pin to the through hole, wherein the inner space of the lower opening of the guide hole is formed to expand in a downward direction to guide the introduction of the suspension pin, and Wherein, the suspension unit further includes a blocking member formed on the lifting body to limit the rotation of the suspension pin.

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