A positioning device for a logistics supply chain

Abstract

The present invention belongs to the technical field of logistics equipment, and discloses a positioning device for a logistics supply chain. The technical key points are as follows: It includes a workbench, on the surface of the workbench, two groups of vertical plates are fixedly installed. On the opposite side walls of the two groups of vertical plates, multiple groups of bearing rollers distributed side by side are respectively rotatably installed. A conveyor belt is commonly sleeved on the surfaces of the multiple groups of bearing rollers. On the surface of the conveyor belt, multiple groups of cross columns are fixedly installed at equal intervals. A positioning mechanism is arranged on the surface of the cross columns. The positioning mechanism includes a positioning plate, a support assembly and a telescopic assembly. When the conveyor belt conveys an item, by setting the support assembly and the telescopic assembly to cooperate with each other, the two groups of positioning plates on both sides of the item can be controlled to move relatively, and thus the item can be automatically pushed to the middle position of the conveyor belt. The information entry mechanism can accurately scan and enter the information of the item directly below.

Description

Technical Field

[0001] The present invention relates to the technical field of logistics equipment, and in particular to a positioning device for a logistics supply chain. Background Art

[0002] The logistics supply chain includes enterprise logistics, non-profit organization logistics, and household logistics, etc. From the steps, the supply chain materials can be divided into procurement, production, and marketing. With the rapid development of the e-commerce industry, logistics companies need to classify and convey a large number of express goods. During production and conveyance, people need to use a positioning device to assist in classifying and processing express items.

[0003] When conveying express items, an information entry device is required to scan and enter information such as the order number on the surface of the item into the system. The information entry device is usually directly fixed above the conveyor belt. The information entry device can only scan and process the area directly below. When the existing logistics conveying equipment conveys items, the items are scattered on the surface of the conveyor belt and cannot be automatically placed in the middle of the conveyor belt. When the items are near the two sides of the conveyor belt, the information entry device cannot accurately scan the information such as the order number on the surface of the item, and the use effect is poor. Summary of the Invention

[0004] The purpose of the present invention is to provide a positioning device for a logistics supply chain to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A positioning device for a logistics supply chain includes a workbench. Support legs are respectively arranged around the bottom wall of the workbench. Two groups of oppositely distributed vertical plates are fixedly installed on the surface of the workbench. A plurality of groups of juxtaposed load-bearing rollers are rotatably installed on the opposite side walls of the two groups of vertical plates. There is a gap between the load-bearing rollers distributed relatively on the surfaces of the two groups of vertical plates. A conveyor belt is commonly sleeved on the surfaces of the plurality of groups of load-bearing rollers. A plurality of groups of equally spaced cross columns are fixedly installed on the surface of the conveyor belt. An information entry mechanism located above the conveyor belt is fixedly installed between the two groups of vertical plates. A driving component that cooperates with the load-bearing rollers is arranged between the two groups of vertical plates. The driving component is used to control the rotation of the load-bearing rollers and thereby control the rotation of the conveyor belt between the two groups of vertical plates. A positioning mechanism is arranged on the surface of the cross column. The positioning mechanism includes a positioning plate, a support component, and a telescopic component. There are two groups of positioning plates. The support component is located inside the cross column and is connected to the positioning plate. The support component is used to control the two groups of positioning plates to be respectively located at both ends of the cross column. The telescopic component is connected to the support component. When the conveyor belt drives the cross column to move between the two groups of vertical plates, the telescopic component controls the two groups of positioning plates to move relatively outside the cross column by cooperating with the support component.

[0007] As a further solution of the present invention: The driving assembly includes a rotating shaft rotatably installed by two sets of vertical plates. Tooth rings are respectively and fixedly installed on the surfaces of the bearing rollers of the two sets of vertical plates close to the rotating shaft. A transmission gear disc meshed with the tooth rings is fixedly installed on the surface of the rotating shaft. One end of the rotating shaft extends outside the vertical plate and is connected to a motor.

[0008] As a further solution of the present invention: The support assembly includes a telescopic cavity opened inside a cross-column. Two sets of oppositely distributed sliding blocks are slidably installed in the telescopic cavity. Two sets of oppositely distributed baffles are fixedly installed in the middle of the telescopic cavity. An extrusion spring is fixedly installed on the side wall of the baffle facing the sliding block. The telescopic end of the extrusion spring is connected to the sliding block. Two sets of oppositely distributed connection grooves communicating with the telescopic cavity are inwardly opened on the surface of the cross-column. A support rod is fixedly installed on the surface of the sliding block. One end of the support rod away from the sliding block passes through the connection groove and extends outside the cross-column and is fixedly connected to a positioning plate.

[0009] As a further solution of the present invention: The telescopic assembly includes a bottom hole opened upward at the central position of the bottom of the cross-column and communicating with the telescopic cavity. A pulling rope is fixedly installed on the side wall of the sliding block facing the baffle. One end of the pulling rope away from the sliding block passes through the bottom hole and the conveyor belt and is fixedly installed with a control block. The control block is made of a magnetic material. First brackets are respectively and fixedly installed on the opposite side walls of the two sets of vertical plates. The two sets of first brackets extend into the inner cavity of the conveyor belt and are jointly and fixedly installed with magnetic positioning blocks cooperating with the control block.

[0010] As a further solution of the present invention: An auxiliary positioning portion is provided on the side wall of the control block. When the control block is separated from the magnetic positioning block, the auxiliary positioning portion is used to limit the movement trajectory of the control block.

[0011] As a further solution of the present invention: The auxiliary positioning portion includes auxiliary positioning blocks respectively and fixedly installed on the opposite side walls of the control block. A guiding groove is opened on the surface of the auxiliary positioning block. Second brackets are respectively and fixedly installed on the opposite side walls of the two sets of vertical plates. The second brackets extend into the inner cavity of the conveyor belt and are fixedly installed with guiding rods cooperating with the guiding groove.

[0012] As a further solution of the present invention: A protection wheel cooperating with the pulling rope is rotatably installed in the telescopic cavity.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: When the conveyor belt conveys an article, by arranging the support assembly and the telescopic assembly to cooperate with each other, the relative movement of the two groups of positioning plates on both sides of the article can be controlled, and then the article can be automatically pushed to the middle position of the conveyor belt. The information entry mechanism can accurately scan and enter the information of the article directly below. This solves the problem that currently the articles are scattered on the surface of the conveyor belt, and when the articles are near the two sides of the conveyor belt, the information entry device cannot accurately scan the information such as the order number on the surface of the article, resulting in poor use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. 6 is a schematic perspective view of a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0015] Figure 2 FIG. 10 is a schematic front view of a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0016] Figure 3 FIG. 14 is a schematic diagram of a carrier roller and its connection structure in a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0017] Figure 4 FIG. Figure 2 is an enlarged schematic view of A in FIG.

[0018] Figure 5 FIG. Figure 3 is an enlarged schematic view of B in FIG.

[0019] Figure 6 FIG. 30 is a schematic diagram of a cross column and its connection structure in a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0020] Figure 7 FIG. 34 is a schematic diagram of a control block and its connection structure in a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0021] Wherein: 1 - workbench, 2 - vertical plate, 3 - carrier roller, 4 - conveyor belt, 5 - drive assembly, 51 - toothed ring, 52 - rotating shaft, 53 - transmission gear disk, 54 - motor, 6 - cross column, 7 - positioning mechanism, 71 - positioning plate, 72 - support assembly, 721 - telescopic cavity, 722 - baffle, 723 - connection groove, 724 - sliding block, 725 - support rod, 726 - compression spring, 73 - telescopic assembly, 731 - bottom hole, 732 - pulling rope, 733 - control block, 734 - first bracket, 735 - magnetic positioning block, 8 - information entry mechanism, 9 - auxiliary positioning part, 91 - auxiliary positioning block, 92 - guiding groove, 93 - second bracket, 94 - guiding rod, 10 - protection wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0023] The following will describe in detail the specific implementation of the present invention in combination with specific embodiments.

[0024] As Figure 1 、 Figure 2 、 Figure 3 shown, it is a structural diagram of a positioning device for a logistics supply chain provided by an embodiment of the present invention, including a workbench 1. Support legs are respectively arranged around the bottom wall of the workbench 1. Two groups of oppositely distributed vertical plates 2 are fixedly installed on the surface of the workbench 1. A plurality of groups of juxtaposed carrying rollers 3 are rotatably installed on the opposite side walls of the two groups of vertical plates 2. There is a gap between the carrying rollers 3 on the opposite surfaces of the two groups of vertical plates 2. A conveyor belt 4 is sleeved on the surfaces of the plurality of groups of carrying rollers 3. A plurality of equally spaced cross columns 6 are fixedly installed on the surface of the conveyor belt 4. An information input mechanism 8 located above the conveyor belt 4 is fixedly installed jointly in the middle of the two groups of vertical plates 2. A driving assembly 5 that cooperates with the carrying rollers 3 is arranged between the two groups of vertical plates 2. The driving assembly 5 is used to control the rotation of the carrying rollers 3 so as to control the rotation of the conveyor belt 4 between the two groups of vertical plates 2. A positioning mechanism 7 is arranged on the surface of the cross column 6. The positioning mechanism 7 includes a positioning plate 71, a support assembly 72 and a telescopic assembly 73. There are two groups of positioning plates 71. The support assembly 72 is located inside the cross column 6 and is connected to the positioning plate 71. The support assembly 72 is used to control the two groups of positioning plates 71 to be respectively located at both ends of the cross column 6. The telescopic assembly 73 is connected to the support assembly 72. When the conveyor belt 4 drives the cross column 6 to move between the two groups of vertical plates 2, the telescopic assembly 73 controls the two groups of positioning plates 71 to move relatively outside the cross column 6 by cooperating with the support assembly 72.

[0025] During use, the driving component 5 drives a set of carrier rollers 3 on the surfaces of two sets of vertical plates 2 to rotate synchronously. The multiple sets of carrier rollers 3 cooperate with each other to drive the conveyor belt 4 to rotate between the two sets of vertical plates 2. Items are placed on the surface of the conveyor belt 4 in sequence, and the conveyor belt 4 drives the items to move synchronously. When the item on the surface of the conveyor belt 4 moves below the information input mechanism 8, the information input mechanism 8 can scan and input information such as the order number on the surface of the item into the system. Initially, the support component 72 controls the positions of the two positioning plates 71. The two positioning plates 71 are respectively located at both ends of the cross-column 6. When conveying an item, the item is placed on the surface of the conveyor belt 4 and between the two positioning plates 71. The conveyor belt 4 drives the cross-column 6 and the item to move synchronously. When the cross-column 6 and the item move, the telescopic component 73 and the support component 72 cooperate with each other to control the two positioning plates 71 to move relatively on the outside of the cross-column 6. The two positioning plates 71 can automatically push the item on the surface of the conveyor belt 4 to the middle position of the conveyor belt 4. The conveyor belt 4 drives the item to continue moving, and the item passes through directly below the information input mechanism 8 in sequence. The information input mechanism 8 can accurately input information such as the order number on the surface of the item. After pushing the item to the middle position of the conveyor belt 4, the conveyor belt 4 drives the item to continue moving, and the support component 72 controls the two positioning plates 71 to move reversely to both ends of the cross-column 6.

[0026] As Figure 1 , Figure 2 , Figure 3 shown, as a preferred embodiment of the present invention, the driving component 5 includes a rotating shaft 52 rotatably installed by two sets of vertical plates 2. Tooth rings 51 are respectively fixedly installed on the surfaces of the carrier rollers 3 on the two sets of vertical plates 2 close to the rotating shaft 52. A transmission gear disc 53 meshingly connected with the tooth ring 51 is fixedly installed on the surface of the rotating shaft 52. One end of the rotating shaft 52 extends outside the vertical plate 2 and is connected with a motor 54.

[0027] During use, the motor 54 drives the rotating shaft 52 to rotate, thereby driving the transmission gear disc 53 to rotate. The transmission gear disc 53 meshes and drives with the tooth ring 51, and thus can drive a set of carrier rollers 3 on the surfaces of the two sets of vertical plates 2 to rotate synchronously. The multiple sets of carrier rollers 3 cooperate with each other to drive the conveyor belt 4 to rotate between the vertical plates 2.

[0028] As Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7As shown, as a preferred embodiment of the present invention, the support assembly 72 includes a telescopic cavity 721 formed inside the cross-column 6. Two sets of oppositely distributed sliding blocks 724 are slidably installed in the telescopic cavity 721. Two sets of oppositely distributed baffles 722 are fixedly installed in the middle of the telescopic cavity 721. An extrusion spring 726 is fixedly installed on the side wall of the baffle 722 facing the sliding block 724. The telescopic end of the extrusion spring 726 is connected to the sliding block 724. Two sets of oppositely distributed connection grooves 723 that communicate with the telescopic cavity are inwardly formed on the surface of the cross-column 6. A support rod 725 is fixedly installed on the surface of the sliding block 724. The end of the support rod 725 away from the sliding block 724 passes through the connection groove 723 and extends to the outside of the cross-column 6 and is fixedly connected to the positioning plate 71.

[0029] During use, the extrusion spring 726 exerts a thrust on the sliding block 724. The two sliding blocks 724 are respectively located at both ends of the telescopic cavity 721. The sliding block 724 and the support rod 725 cooperate with each other to support and fix the positioning plate 71. When an article is between the two positioning plates 71 and moves, the telescopic assembly 73 controls the relative movement of the two sliding blocks 724 in the telescopic cavity 721. The sliding block 724 and the support rod 725 cooperate with each other, thereby driving the two positioning plates 71 to move synchronously and relatively outside the cross-column 6. The two positioning plates 71 can automatically push the article on the surface of the conveyor belt 4 to the middle position of the conveyor belt 4. After the article is pushed to the middle position of the conveyor belt 4, the conveyor belt 4 drives the article to continue to move. The telescopic assembly 73 releases the pulling force on the sliding block 724. The extrusion spring 726 pushes the two sliding blocks 724 to move reversely to both ends of the telescopic cavity 721 again. At this time, the two positioning plates 71 synchronously move to both ends of the cross-column 6.

[0030] As Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, as a preferred embodiment of the present invention, the telescopic assembly 73 includes a bottom hole 731 formed upward at the central position of the bottom of the cross-column 6 and communicating with the telescopic cavity 721. A pulling rope 732 is fixedly installed on the side wall of the sliding block 724 facing the baffle 722. The end of the pulling rope 732 away from the sliding block 724 passes through the bottom hole 731 and the conveyor belt 4 and is fixedly installed with a control block 733. The control block 733 is made of a magnetic material. First brackets 734 are respectively fixedly installed on the opposite side walls of the two vertical plates 2. The two first brackets 734 extend into the inner cavity of the conveyor belt 4 and are jointly fixedly installed with a magnetic positioning block 735 that cooperates with the control block 733.

[0031] When the conveyor belt 4 drives the cross column 6 to move, the cross column 6 drives the control block 733 to move synchronously. When the control block 733 moves above the magnetic positioning block 735, the magnetic positioning block 735 is connected to the control block 733 as a whole through magnetic attraction. The conveyor belt 4 drives the cross column 6 to continue moving. At this time, the control block 733 remains fixed on the surface of the magnetic positioning block 735. The control block 733 cooperates with the pulling rope 732 to pull the two sliding blocks 724 to move relatively in the telescopic cavity 721. At this time, the two positioning plates 71 can push the article to the middle position of the conveyor belt 4. The cross column 6 continues to move. When the sliding block 724 moves to the limit position in the telescopic cavity 721, the control block 733 is separated from the magnetic positioning block 735, and the control block 733 moves below the bottom hole 731.

[0032] As Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 shown, as a preferred embodiment of the present invention, an auxiliary positioning portion 9 is provided on the side wall of the control block 733. When the control block 733 is separated from the magnetic positioning block 735, the auxiliary positioning portion 9 is used to limit the movement track of the control block 733.

[0033] After the control block 733 is separated from the magnetic positioning block 735, when the control block 733 moves in the direction of the bottom hole 731, the auxiliary positioning portion 9 can limit the movement track of the control block 733 to prevent the control block 733 from moving randomly in the inner cavity of the conveyor belt 4.

[0034] As Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 shown, as a preferred embodiment of the present invention, the auxiliary positioning portion 9 includes auxiliary positioning blocks 91 fixedly installed on the opposite side walls of the control block 733 respectively. A guiding groove 92 is formed on the surface of the auxiliary positioning block 91. Second brackets 93 are fixedly installed on the opposite side walls of the two vertical plates 2 respectively. The second brackets 93 extend into the inner cavity of the conveyor belt 4 and are fixedly installed with guiding rods 94 that cooperate with the guiding groove 92.

[0035] The conveyor belt 4 drives the cross column 6 and the control block 733 to move. When the control block 733 moves above the magnetic positioning block 735, the magnetic positioning block 735 is connected to the control block 733 as a whole through magnetic attraction. At this time, the auxiliary positioning blocks 91 on both sides of the control block 733 are inserted outside the guiding rods 94 through the guiding grooves 92. When the sliding block 724 moves to the limit position in the telescopic cavity 721, the control block 733 is separated from the magnetic positioning block 735, and the control block 733 can move along the surface of the guiding rod 94, which can effectively improve the stability of the control block 733.

[0036] As Figure 6 shown, as a preferred embodiment of the present invention, a protection wheel 10 cooperating with the pulling rope 732 is rotatably installed in the telescopic cavity 721. The protection wheel 10 can effectively reduce the wear of the pulling rope 732.

[0037] The working principle of the present invention is as follows: When in use, the motor 54 drives the rotating shaft 52 to rotate, thereby driving the transmission gear disk 53 to rotate. The transmission gear disk 53 is engaged with the gear ring 51 for transmission, and thus can drive a group of carrying rollers 3 on the surfaces of the two vertical plates 2 to rotate synchronously. The multiple groups of carrying rollers 3 cooperate with each other to drive the conveyor belt 4 to rotate between the vertical plates 2. Items are sequentially placed on the surface of the conveyor belt 4, and the conveyor belt 4 drives the items to move synchronously. When the item on the surface of the conveyor belt 4 moves below the information input mechanism 8, the information input mechanism 8 can scan and input information such as the order number on the surface of the item into the system. Initially, the two positioning plates 71 are respectively located at both ends of the cross column 6.

[0038] When conveying an item, the item is placed on the surface of the conveyor belt 4 and between the two positioning plates 71. The conveyor belt 4 drives the cross column 6 and the item to move synchronously. The cross column 6 drives the control block 733 to move synchronously. When the control block 733 moves above the magnetic positioning block 735, the magnetic positioning block 735 is connected to the control block 733 as a whole through magnetic attraction. The conveyor belt 4 drives the cross column 6 to continue moving. At this time, the control block 733 remains fixed on the surface of the magnetic positioning block 735. The control block 733 cooperates with the pulling rope 732 to pull the two sliding blocks 724 to move relatively in the telescopic cavity 721. The sliding blocks 724 cooperate with the support rods 725, and thus drive the two positioning plates 71 to move relatively synchronously outside the cross column 6. The two positioning plates 71 can automatically push the item on the surface of the conveyor belt 4 to the middle position of the conveyor belt 4. After pushing the item to the middle position of the conveyor belt 4, the conveyor belt 4 drives the item to continue moving. The item sequentially passes through directly below the information input mechanism 8, and the information input mechanism 8 can accurately input information such as the order number on the surface of the item. The cross column 6 continues to move. When the sliding block 724 moves to the limit position in the telescopic cavity 721, the control block 733 is separated from the magnetic positioning block 735. The compression spring 726 pushes the two sliding blocks 724 to move reversely to both ends of the telescopic cavity 721 again. At this time, the two positioning plates 71 move to both ends of the cross column 6 synchronously.

[0039] The above has described the preferred embodiments of the present invention in detail, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A positioning device for a logistics supply chain, comprising a workbench, the bottom wall of which is respectively provided with supporting legs, and the surface of which is fixedly provided with two sets of vertical plates which are relatively distributed, characterized in that: Multiple groups of parallel distributed bearing rollers are rotatably installed on the two opposite side walls of the two groups of vertical plates, and there are gaps between the bearing rollers that are relatively distributed on the surfaces of the two groups of vertical plates. Conveyor belts are commonly sleeved on the surfaces of the multiple groups of bearing rollers, and multiple groups of horizontal columns with equal spacing are fixedly installed on the surface of the conveyor belt. An information input mechanism located above the conveyor belt is commonly fixedly installed in the middle of the two groups of vertical plates; A driving assembly that cooperates with the bearing roller is arranged between the two sets of vertical plates, and the driving assembly is used to control the bearing roller to rotate and thus control the conveyor belt to rotate between the two sets of vertical plates; The cam face is provided with a positioning mechanism, and the positioning mechanism includes a positioning plate, a support assembly and a telescopic assembly, and the positioning plate is provided with two groups, and the support assembly is located in the cross column and connected to the positioning plate, and the support assembly is used to control the two groups of positioning plates to be respectively located at two ends of the cross column, and the support assembly includes a telescopic cavity opened in the cross column, and two groups of relatively distributed sliding blocks are slidably installed in the telescopic cavity, and two groups of relatively distributed baffles are fixedly installed in the middle of the telescopic cavity, and an extrusion spring is fixedly installed on a side wall of the baffle facing the sliding block, and the telescopic end of the extrusion spring is connected to the sliding block, and two groups of relatively distributed connecting grooves are opened inwardly on the surface of the cross column and communicated with the telescopic cavity, and a support rod is fixedly installed on the surface of the sliding block, and one end of the support rod away from the sliding block passes through the connecting groove to extend to the outside of the cross column and is fixedly connected to the positioning plate; The telescopic assembly is connected to the supporting assembly. When the conveyor belt drives the horizontal column to move between the two groups of vertical plates, the telescopic assembly controls the two groups of positioning plates to move relative to each other on the outside of the horizontal column by cooperating with the supporting assembly. The telescopic assembly includes a bottom hole that is opened upward from the center position of the bottom of the horizontal column and is connected to the telescopic cavity. A pulling rope is fixedly installed on one side wall of the sliding block facing the baffle. The end of the pulling rope away from the sliding block passes through the bottom hole and the conveyor belt and is fixedly installed with a control block. The control block is made of magnetic material. The opposite side walls of the two groups of vertical plates are respectively fixedly installed with first brackets. The two groups of first brackets extend to the inner cavity of the conveyor belt and are jointly fixed with magnetic positioning blocks that cooperate with the control block.

2. A positioning device for logistics supply chain according to claim 1, characterized in that: The driving assembly includes a rotating shaft that is mounted to rotate together with two sets of vertical plates. The surfaces of the two sets of vertical plates and the bearing rollers close to the rotating shaft are respectively fixedly mounted with gear rings. The surface of the rotating shaft is fixedly mounted with a transmission gear plate that is meshed with the gear rings. One end of the rotating shaft extends to the outside of the vertical plate and is connected to a motor.

3. A positioning device for logistics supply chain according to claim 1, characterized in that: The side wall of the control block is provided with an auxiliary positioning part, and when the control block is separated from the magnetic positioning block, the auxiliary positioning part is used to limit the moving track of the control block.

4. A positioning device for logistics supply chain according to claim 3, characterized in that: The auxiliary positioning part includes auxiliary positioning blocks fixedly installed on two side walls opposite to the control block, and guide grooves are opened on the surface of the auxiliary positioning blocks. Second brackets are fixedly installed on the two side walls opposite to each other of the two groups of vertical plates, and the second brackets extend into the inner cavity of the conveyor belt and are fixedly installed with guide rods that cooperate with the guide grooves.

5. A positioning device for logistics supply chain according to claim 1, characterized in that: A protection wheel that cooperates with the pulling rope is rotatably installed in the telescopic cavity.

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