KR102270328B1 - Stacker crane - Google Patents

Abstract

A stacker crane is disclosed. Stacker crane according to an embodiment of the present invention, the elevating carriage (Carriage) provided in the vicinity of the rack post (Rack Post) of the rack (Rack) in which the bucket (Bucket) is stacked in multiple stages in the height direction; And it is mounted on the elevating carriage includes a fork device (Fork Device) for holding the side of the bucket to proceed with the loading and unloading of the bucket.

Description

Stacker Crane {STACKER CRANE}

The present invention relates to a stacker crane, and more particularly, in spite of being able to minimize the height of the rack and the left and right clearances of the positions where the buckets are loaded, the storage amount of the buckets can be significantly increased compared to the prior art, and the size Not only can it be commonly applied to a variety of buckets with different types, but also reliability can be secured because the bucket can be stably transferred and loaded even if an eccentric load occurs on the bucket, and furthermore, the previously applied Home Stand Unit (Home Stand Unit) ), it relates to a stacker crane that can contribute to the cost reduction of equipment by being able to smoothly carry out the loading and unloading of buckets.

Logistics was originally an abbreviation for physical distribution, but its meaning has been expanded to mean all kinds of activities that create temporal and spatial values of cargo.

Recently, with the rapid increase of online distribution, the volume of cargo is increasing, and the need for an efficient logistics system is increasing according to the vitalization of the cargo distribution industry.

In other words, increasing the temporal and spatial value of cargo appears to be the competitive edge of corporate management, and in business management, logistics management is recognized as a differentiated strategic method of enhancing competitiveness through maximizing customer service as well as cost reduction. . Therefore, it is necessary to speed up the logistics processing speed through the efficiency of the logistics system.

On the other hand, the conventional logistics system includes a rack having a storage space for cargo, a stacker crane for elevating and lowering cargo to a rack of a predetermined storage space, and a moving rail on which the stacker crane moves, the logistics system The stacker crane inside plays the role of receiving products and parts from the loading and unloading balance and storing them in the designated rack.

Figure 1 schematically shows an embodiment of a general up / down (up / down) type distribution system, Figure 2 is a partial plan view of the up / down (up / down) type distribution system of Figure 1, Figure 3 is 1 is a partial side view of the up / down (up / down) logistics system.

Referring to these drawings, the conventional up/down type logistics system (2) transports the cargo from the load arm (Load Arm, 6) of the rack (4) when the cargo is released from the rack (rack, 4) in which the cargo is stored. Cargo is released by performing an up/down operation that is spaced apart by a certain height.

And, even when loading the cargo into the rack 4 , the cargo is placed in a state spaced apart from the load arm 6 of the rack 4 by a certain height, and then the cargo is seated on the load arm 6 of the rack 4 . An up/down type stacker crane was used.

As such, the conventional stacker crane loads the buckets in the automatic warehouse through the travelling, hoisting, and forking operations to the load arm 6 of the rack 4 composed of multiple stages and multiple rows. is a device that At this time, the fork device (Fork Device, 3) in charge of the forking operation of the stacker crane is attached to a separate elevating carriage (Carriage) to allow the bucket to be loaded onto the load arm (6) and the conveyor (Conveyor).

On the other hand, although not shown in detail in the drawings, the fork device 3 of the stacker crane applied in the prior art has been applied as a type to lift the bucket from the designated load arm 6, so it prevents interference with the surrounding bucket located at the top of it. An avoidable space, that is, a clearance between the buckets was required, and due to this, there is a problem in that the storage amount is reduced despite the increase in the height of the rack (4).

In addition, since the fork device 3 of the stacker crane applied to the prior art is a type of lifting a bucket, it can be applied only to a specific single type of bucket, and thus there is a problem of poor compatibility.

Due to such a problem, the fork device 3 of the stacker crane applied to the prior art is a home stand unit as shown in FIG. 3 in order to eliminate the interference of the feeding roller or chain in the input/exit conveyor line. Considering that the cost of equipment is inevitably high due to the need to install 5), it is necessary to develop technology to solve this problem.

Registered Patent Publication No. 10-0574266 (2006.04.26. Announcement) Japanese Patent Application Laid-Open No. Hei 05-132111 (published on May 28, 1993) Unexamined Patent Publication No. 10-2015-0116653 (published on October 16, 2015)

Therefore, the technical problem to be achieved by the present invention is that, despite being able to minimize the height of the rack and the left and right clearances of the positions where the buckets are loaded, the storage amount of the buckets can be significantly increased compared to the prior art, and various Not only can it be commonly applied to the bucket, but even if an eccentric load occurs on the bucket, reliability can be secured because the bucket can be reliably transferred. Furthermore, the bucket can be moved without the previously applied Home Stand Unit. It is to provide a stacker crane that can contribute to cost reduction of equipment by enabling smooth rework.

According to an aspect of the present invention, the elevating carriage (Carriage) provided in the vicinity of the rack post (Rack Post) of the rack (Rack) in which the bucket (Bucket) is stacked in multiple stages in the height direction; and a fork device mounted on the elevating carriage and holding the side of the bucket to carry out the transfer and loading of the bucket.

The fork device may be a side belt type fork device that holds the side of the bucket through a rotating side belt and carries out the loading and unloading of the bucket.

The side belt type fork device may include: a side belt unit having the side belt; and a forking unit connected to the side belt unit and configured to perform a forking operation in which the side belt unit moves forward and backward between the rack posts.

The side belt unit is disposed as a pair on both sides with the bucket interposed therebetween, and the bucket can be transferred to the rack and the loading/unloading conveyor based on the rotational driving of the side belt, and the pair of side belt units The configuration of the belt unit may be the same.

The side belt unit, the main frame (Main Frame); a feeding motor mounted on one side of the main frame and generating power for rotating the side belt; a drive pulley connected to the feeding motor to rotate; and an idle pulley that rotatably supports the side belt together with the drive pulley in a closed loop manner, but is provided to be able to enter the rack post.

The idle pulley may be provided as a pair.

The side belt unit may further include at least one tension roller that tensionably supports the drive pulley and the side belt connected to the idle pulley.

a roller bracket connected to the main frame of the side belt unit; and a guide roller provided on the roller bracket and guiding the forking operation of the side belt unit by the forking unit.

The forking unit, the side belt unit is mounted, the side belt unit may include a guide block (Guide Block) moving on the guide frame to proceed forward and backward forking operation to approach or spaced apart from the rack.

The forking unit may include a forking driving unit for forking operation of the side belt unit on the guide block.

The forking driving unit may include a common forking motor that provides power for a forking operation of the pair of side belt units in common.

The forking driving unit may include: a spur gear connected to the common forking motor; a forking drive shaft to which the spur gear is directly connected; a forking driven shaft disposed to be spaced apart from the forking drive shaft with the guide block interposed therebetween; and a forking chain connected to the forking drive shaft, the guide block, and the forking driven shaft.

The side belt type fork device may further include a clamping unit connected to the pair of side belt units and configured to perform a clamping operation in which the side belt unit is clamped to the side of the bucket. can

The clamping unit may include a common clamping motor that provides power for the pair of side belt units to perform a clamping operation in common.

The clamping unit may include a common rotation shaft connected to the common clamping motor to rotate in a forward and reverse direction; and a motion transmission unit connected to both end regions of the common rotation shaft and the pair of side belt units, respectively, and transmitting the rotational motion of the common rotation shaft as a linear motion of the pair of side belt units. .

The motion transmission unit may be provided symmetrically on both end regions of the common rotation shaft.

The motion transmission unit may include a shaft rotation gear unit connected to the common rotation shaft and co-rotating when the common rotation shaft rotates; and a pair of link members rotatably connected to the shaft rotation gear unit and the pair of side belt units, respectively.

According to another aspect of the present invention, a loading tower having a rack (Rack) in which the bucket (Bucket) is stacked in multiple stages in the height direction; and a stacker crane for loading and unloading the bucket while moving along the rack, wherein the stacker crane includes an elevating carriage provided around the rack post of the rack; and a fork device mounted on the elevating carriage and holding the side of the bucket to carry out the transfer and loading of the bucket.

The fork device may be a side belt type fork device that holds the side of the bucket through a rotating side belt and carries out the loading and unloading of the bucket.

The side belt type fork device may include: a side belt unit having the side belt; a forking unit connected to the side belt unit and configured to perform a forking operation in which the side belt unit moves forward and backward between the rack posts; and a clamping unit connected to the side belt unit and configured to perform a clamping operation in which the side belt unit is clamped to the side of the bucket.

According to the present invention, although it is possible to minimize the height of the rack and the left and right clearances at the location where the bucket is loaded, the storage amount of the bucket can be significantly increased compared to the prior art, and it is commonly applied to various buckets of different sizes and types. In addition to this, the bucket can be stably moved and loaded even if an eccentric load occurs on the bucket, so reliability can be secured. Furthermore, bucket loading and unloading can be performed smoothly without the previously applied Home Stand Unit. This can contribute to cost reduction of equipment.

1 is a view schematically showing an embodiment of a general up / down (up / down) type logistics system.
Figure 2 is a partial plan view of the up / down (up / down) type logistics system of Figure 1.
Figure 3 is a partial side view of the up / down (up / down) logistics system of Figure 1;
4 is a schematic structural diagram of a logistics system having a stacker crane according to an embodiment of the present invention.
5 is a view for explaining directions of a forking operation and a clamping operation with respect to the side belt unit.
6 is a schematic side structural view of the fork device.
7 is a view illustrating a clamping operation of the side belt unit in FIG. 6 .
8 is a plan view of the side belt unit.
FIG. 9 is a side structural view of FIG. 8 .
10 is a plan structural view of the forking unit.
11 is a plan view of the clamping unit.
12A to 12D are flow diagrams of an outgoing process for a bucket.
13A-13D are flow diagrams of a warehousing process for a bucket.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

4 is a schematic structural diagram of a logistics system having a stacker crane according to an embodiment of the present invention, and FIG. 5 is a view for explaining the direction of the forking operation and the clamping operation for the side belt unit 6 is a schematic side structural diagram of the fork device, FIG. 7 is a view showing the clamping operation of the side belt unit in FIG. 6, FIG. 8 is a plan structural view of the side belt unit, and FIG. 9 is the side view of FIG. It is a structural diagram, FIG. 10 is a plan structural diagram of a forking unit, FIG. 11 is a plan structural diagram of a clamping unit, FIGS. 12A to 12D are process diagrams of a delivery process for a bucket, and FIGS. 13A to 13D are for a bucket It is a flow chart of the warehousing process (process).

Referring to these drawings, in the case of this embodiment, although the height of the rack and the left and right clearances of the positions where the buckets are loaded can be minimized, the storage amount of the buckets can be significantly increased compared to the prior art, and the sizes and types are different. Not only can it be commonly applied to various buckets, but even if an eccentric load occurs on the bucket, reliability can be secured because the bucket can be stably transferred, and furthermore, the bucket can be installed without the previously applied Home Stand Unit. It enables smooth transfer and loading and contributes to cost reduction of equipment.

The logistics system according to this embodiment that can provide this effect is a loading tower 30 having a rack (Rack) in which the buckets are stacked in multiple stages in the height direction, as schematically shown in FIG. 4, and the loading tower It includes a stacker crane (20, Stacker Crane) for loading the bucket while moving along the rack of (30).

By the logistics system, it is possible to flexibly proceed with the warehouse process (process) for the bucket as shown in FIGS. 12a to 12d, and, as shown in FIGS. 13a to 13d.

12A to 12D, and 13A to 13D, the stacker crane 20 of a different form than before is used to proceed with the shipment or warehousing process. While the conventional stacker crane supports the bucket from the lower part to load the bucket, the stacker crane 20 of the present embodiment loads the bucket by holding the side of the bucket.

Therefore, although the height of the rack and the left and right clearances of the positions at which the buckets are loaded can be minimized, the storage amount of the buckets can be significantly increased compared to the prior art. In addition, since it holds the side of the bucket, it can be commonly applied to a variety of buckets of different sizes and types, and even if an eccentric load occurs on the bucket, the bucket can be stably transferred and loaded, so reliability can be secured. In addition, the transfer and loading of buckets can be smoothly performed without a previously applied home stand unit, thereby contributing to cost reduction of equipment.

Stacker crane 20 is mounted on the elevating carriage (10, Carriage) and the elevating carriage (10) provided around the rack post (Rack Post) of the rack, hold the side of the bucket to carry out the loading and unloading of the bucket and a fork device (100, Fork Device).

The elevating carriage 10 has been shown very schematically, and the elevating carriage 10 may be a kind of elevator for up/down operation of the fork device 100 .

On the other hand, the fork device 100 serves to hold the side of the bucket substantially as shown in FIGS. 12A to 12D and FIGS. 13A to 13D .

In this embodiment, the fork device 100 is a side belt type fork device 100, which carries out the loading and unloading of the bucket by holding the side of the bucket through the rotating side belt 111, that is, by clamping it. Type Fork Device).

Since the side belt type fork device 100 via the belt 111 is applied as in the present embodiment, the various effects described above can be provided.

The side belt type fork device 100 is connected to a side belt unit 110 having a side belt 111 and a side belt unit 110, and the side belt unit 110 is moved back and forth between the rack posts. A forking unit 130 (Forking Unit) that causes the forking operation (see FIG. 5) to proceed, is connected to the side belt unit 110, and the side belt unit 110 is clamped to the side of the bucket. (Clamping) includes a clamping unit (150, Clamping Unit) to proceed (refer to FIG. 5).

First, referring to FIGS. 4 to 9 , the side belt unit 110 is provided with the side belt 111 and is a part that substantially holds the side of the bucket. The side belt unit 110 is provided as a pair in that it is stable when both sides of the bucket are held.

That is, the side belt unit 110 is disposed as a pair on both sides with the bucket interposed therebetween, and the bucket is transferred to and loaded from the rack and the storage conveyor (Conveyor, not shown) based on the rotational driving of the side belt 111 . In this case, the configuration of the pair of side belt units 110 is the same. Therefore, the equipment cost can be reduced.

The side belt unit 110 is mounted on a main frame 113 (Main Frame) and one side of the main frame 113, and a feeding motor 114 for generating power for rotating the side belt 111 (Feeding). Feeding Motor), a drive pulley (115, Drive Pulley) that rotates connected to the feeding motor 114, and the side belt 111 together with the drive pulley 115 are rotatably supported in a closed loop method, but with a rack post. It includes an idle pulley (116, Idle Pulley) provided to be able to enter.

Since the drive pulley 115 and the idle pulley 116 are connected by the side belt 111 , the drive pulley 115 and the idle pulley 116 may rotate together when the feeding motor 114 is operated.

In this embodiment, the idle pulley 116 is provided as a pair, and is disposed at a position protruding from one side of the main frame 113 . In fact, since the entire configuration of the side belt unit 110, in particular, the entire side belt 111 does not need to enter the rack post, and only a part of the idle pulley 116 part enters, the idle pulley 116 is the main frame 113. It is to be disposed in a position protruding to one side of the. 12a to 12d, and 13a to 13d, when the side belt 111 is rotated by the feeding motor 114 in a state where the idle pulley 116 area enters the rack post, the action of the side belt 111 Buckets can be shipped or received.

A tension roller 117 (Tension Roller) is provided on the closed loop line of the side belt 111 . In this embodiment, a plurality of tension rollers 117 are applied. The tension roller 117 serves to support the side belt 111 connected to the drive pulley 115 and the idle pulley 116 in a possible tension. Since the side belt 111 is in a tensioned state by the tension roller 117, the bucket may be stably moved by the side belt 111 to be loaded and unloaded.

A roller bracket 121 is connected to the main frame 113 of the side belt unit 110 . In addition, the roller bracket 121 is provided with a guide roller 122 (Guide Roller) for guiding the forking operation of the side belt unit 110 by the forking unit 130 . The guide roller 122 is a non-motorized free-rotating roller that rotates by the operation of the forking unit 130 .

Next, referring to FIGS. 4 to 7 and FIG. 10 , the forking unit 130 is connected to the side belt unit 110, and the side belt unit 110 moves forward and backward between the rack posts. Forking (Forking) It serves to cause the operation (see Fig. 5) to proceed. Actually, referring to FIG. 5 , the forking operation and the forward/backward operation of the side belt unit 110 are interpreted as the same meaning.

The forking unit 130 has a side belt unit 110 mounted thereon, and a guide block 132 that moves on the guide frame 131 so that the side belt unit 110 performs a forward and backward forking operation in which the side belt unit 110 approaches or separates from the rack. block) is included.

The side belt unit 110 is mounted on the guide block 132 , and the forking driving unit 140 is provided so that the side belt unit 110 is guided by the guide block 132 to perform a forking operation.

The forking driving unit 140 serves to cause the forking operation of the side belt unit 110 on the guide block 132 .

The forking driving unit 140 includes a common forking motor 141 that provides power for the pair of side belt units 110 to perform a forking operation in common. Since the common forking motor 141 is applied, stable control of the forking operation is possible, and the apparatus can be simplified.

The forking drive unit 140 includes a spur gear 142 connected to the common forking motor 141, a forking drive shaft 143 to which the spur gear 142 is directly connected, and a forking drive shaft with the guide block 132 interposed therebetween. It may include a forking driven shaft 144 disposed to be spaced apart from 143 , a forking drive shaft 143 , a guide block 132 , and a forking chain 145 connected to the forking driven shaft 144 .

Accordingly, when the common forking motor 141 is driven and the forking drive shaft 143 rotates, the guide block 132 moves due to the structure of the forking chain 145 connected thereto, and the forking operation of the side belt unit 110 is drawn out. can

Finally, with reference to FIGS. 4 to 7 and FIG. 11 , the clamping unit 150 is connected to the side belt unit 110 , and the side belt unit 110 is clamped to the side of the bucket. Clamping It serves to cause the operation (see Fig. 5) to proceed.

In this embodiment, the side belt unit 110 and the forking unit 130 operate together by the clamping unit 150 . As a result, the forking unit 130 is mounted on the support 155 of the clamping unit 150 , and the side belt unit 110 is connected to the forking unit 130 .

Accordingly, the side belt unit 110 may perform a forking operation as in FIG. 5 by the forking unit 130 , and the side belt unit 110 may perform a clamping operation as in FIG. 5 by the clamping unit 150 .

The clamping unit 150 includes a common clamping motor 151 that provides power for the pair of side belt units 110 to perform a clamping operation in common. Since the common clamping motor 151 is applied, stable control of the clamping operation is possible, and the device can be simplified.

The clamping unit 150 is connected to the common clamping motor 151 and rotates in a forward and reverse direction, a common rotation shaft 152 , both end regions of the common rotation shaft 152 and a pair of side belt units 110 , respectively. It is connected and includes a motion transmission unit 160 that transmits the rotational motion of the common rotation shaft 152 as a linear motion of the pair of side belt units 110 .

In this case, the motion transmission unit 160 may be provided symmetrically on both end regions of the common rotation shaft 152 .

This motion transmission unit 160 is connected to the common rotation shaft 152 and rotates at the same time as the common rotation shaft 152 rotates, the shaft rotation gear unit 161, the shaft rotation gear unit 161 and a pair of side A pair of link members 162 each rotatably connected to the belt unit 110 may be included. Although implementing the motion transmission unit 160 in a link structure as in this embodiment is advantageous for simplification and stable operation of the device, the motion transmission unit 160 may be applied to various structures. Accordingly, the scope of the present invention is not limited to the shape of the drawings.

By driving the side belt type fork device 100 having this configuration, that is, the side belt unit 110, the forking unit 130, and the clamping unit 150, a forking operation (see FIG. 5) and clamping ( Clamping) operation (see Fig. 5) to proceed sequentially, as in Figs. 12a to 12d, it is possible to effectively proceed with the shipping process for the bucket, as well as the warehousing process for the bucket as shown in Figs. 13a to 13d. can proceed effectively.

According to this embodiment, which acts in the structure as described above, although it is possible to minimize the height of the rack stage and the left and right clearances of the position where the bucket is loaded, the storage amount of the bucket can be significantly increased compared to the prior art, and the size Not only can it be commonly applied to a variety of buckets with different types, but also reliability can be secured because the bucket can be stably transferred and loaded even if an eccentric load occurs on the bucket, and furthermore, the previously applied Home Stand Unit (Home Stand Unit) ), the transfer and loading of buckets can be carried out smoothly, contributing to cost reduction of equipment.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations fall within the scope of the claims of the present invention.

10: elevating carriage 20: stacker crane
30: loading tower 100: fork device
110: side belt unit 111: side belt
113: main frame 114: feeding motor
115: drive pulley 116: idle pulley
117: tension roller 121: roller bracket
122: guide roller 130: forking unit
131: guide frame 132: guide block
140: forking driving unit 141: common forking motor
142: spur gear 143: forking drive shaft
144: forking driven shaft 145: forking chain
150: clamping unit 151: common clamping motor
152: common rotation shaft 155: support
160: motion transmission unit 161: shaft rotation gear unit
162: link part

Claims (20)

Elevating carriage (Carriage) provided around the rack post (Rack Post) of the rack (Rack) in which the bucket (Bucket) is stacked in multiple stages in the height direction; and
It is mounted on the elevating carriage and includes a fork device (Fork Device) for holding the side of the bucket to proceed with the loading and unloading of the bucket,
The fork device is a side belt type fork device that holds the side of the bucket through a rotating side belt and carries out the loading and unloading of the bucket, but the side belt type fork device is ,
A side belt unit provided with the side belt but disposed as a pair on both sides with the bucket interposed therebetween and transferring the bucket to the rack and a storage conveyor (Conveyor) based on the rotational driving of the side belt. );
a forking unit connected to the side belt unit and configured to perform a forking operation in which the side belt unit moves forward and backward between the rack posts; and
and a clamping unit connected to the pair of side belt units and configured to perform a clamping operation in which the side belt unit is clamped to the side of the bucket;
The clamping unit is
a common clamping motor that provides power for a pair of side belt units to perform a clamping operation in common;
a common rotation shaft connected to the common clamping motor to rotate in a forward and reverse direction; and
and a motion transmission unit connected to both end regions of the common rotation shaft and the pair of side belt units, respectively, and transmitting the rotational motion of the common rotation shaft as a linear motion of the pair of side belt units,
The motion transmission unit,
a shaft rotation gear unit connected to the common rotation shaft and co-rotating when the common rotation shaft rotates; and
Stacker crane comprising a pair of link members rotatably connected to the shaft rotation gear unit and the pair of side belt units, respectively. delete delete According to claim 1,
A stacker crane, characterized in that the configuration of the pair of side belt units is the same. According to claim 1,
The side belt unit,
Main Frame;
a feeding motor mounted on one side of the main frame and generating power for rotating the side belt;
a drive pulley connected to the feeding motor to rotate; and
Stacker crane comprising an idle pulley that rotatably supports the side belt together with the drive pulley in a closed loop manner, but is provided to be able to enter the rack post. 6. The method of claim 5,
The idle pulley stacker crane, characterized in that provided in a pair. 6. The method of claim 5,
The side belt unit,
Stacker crane further comprising at least one tension roller (Tension Roller) for supporting the side belt connected to the drive pulley and the idle pulley in a possible tension (Tension). According to claim 1,
a roller bracket connected to the main frame of the side belt unit; and
It is provided on the roller bracket, the stacker crane characterized in that it further comprises a guide roller (Guide Roller) for guiding the forking operation of the side belt unit by the forking unit. According to claim 1,
The forking unit,
The side belt unit is mounted, the stacker crane characterized in that it comprises a guide block (Guide Block) moving on the guide frame to proceed forward and backward forking operation of the side belt unit approaching or spaced apart from the rack. 10. The method of claim 9,
The forking unit,
Stacker crane comprising a forking driving unit for forking operation of the side belt unit on the guide block. 11. The method of claim 10,
The forking driving unit,
Stacker crane, characterized in that it comprises a common forking motor (Forking Motor) for providing power for a pair of the side belt unit in common forking operation. 12. The method of claim 11,
The forking driving unit,
a spur gear connected to the common forking motor;
a forking drive shaft to which the spur gear is directly connected;
a forking driven shaft disposed to be spaced apart from the forking drive shaft with the guide block interposed therebetween; and
and a forking chain connected to the forking drive shaft, the guide block, and the forking driven shaft. delete delete delete According to claim 1,
The motion transmission unit is a stacker crane, characterized in that provided symmetrically to both end regions of the common rotation shaft. delete delete delete delete

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