CN212401961U - Storage device - Google Patents

Abstract

The utility model discloses a storage device, including the storage rack, the storage rack includes crossbeam and longeron, and is a plurality of the crossbeam sets up along the first direction interval, and is a plurality of the crossbeam is through following the first direction extends the longeron fastening is in the same place in order to constitute frame construction, adjacent two inject the spacing groove that is used for placing rail locomotive's driving gear between the crossbeam. Through set up the spacing groove on storage rack for rail locomotive's driving gear can inject in the spacing groove at the in-process of transporting or depositing, has avoided colliding each other between the in-process driving gear of transporting, leads to the driving gear harm.

Description

Storage device

Technical Field

The utility model relates to a technical field is deposited to the material, especially relates to a strorage device.

Background

The locomotive is a self-propelled vehicle which pulls or pushes a railway vehicle to run and does not load business load per se, and is commonly called a locomotive.

A locomotive drive device (locomtive drive device) is a device for transmitting torque between an output shaft of a traction motor and wheels, wherein a driving gear is a core component of the drive device and needs to be frequently repaired and maintained. After the driving gear is overhauled, the driving gear needs to be transported to a driving device assembling table of an assembling workshop through a turnover box for assembling.

However, the driving gear is easy to collide in the transportation process, so that the driving gear is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model provides a storage device to overcome the technical problem that the driving gear takes place to collide with easily in the transportation.

In order to achieve the above object, the utility model provides a storage device, including the storage rack, the storage rack includes crossbeam and longeron, and is a plurality of the crossbeam sets up along the first direction interval, and is a plurality of the crossbeam is through following the first direction is extended the longeron fastening is in the same place in order to constitute frame construction, adjacent two inject the spacing groove that is used for placing rail locomotive's driving gear between the crossbeam.

The utility model discloses a strorage device through set up the spacing groove on the storage rack, has realized that rail locomotive's driving gear can inject at the in-process of transporting or depositing at the spacing inslot, has solved the driving gear and has collided each other between the driving gear in the transportation, leads to the problem of driving gear harm.

In a possible implementation, the surfaces of two adjacent beams facing each other are configured as slopes or arcs.

The surfaces of the adjacent cross beams, which are opposite to each other, are arranged to be inclined planes or arc surfaces, so that the driving gear can be directly clamped into the limiting groove, and the problem that the driving gear does not shake in the limiting groove is solved.

In a possible implementation manner, the bottom surface of the part of the longitudinal beam between two adjacent cross beams is provided with a supporting block.

The supporting block is arranged on the weak section, which is not supported, of the longitudinal beam, so that the weak section of the longitudinal beam is reinforced, the strength of the longitudinal beam is improved, and the maintenance and replacement cost is reduced.

In a possible implementation manner, the cross beam is fixedly connected with the longitudinal beam through a mortise and tenon structure.

Through adopting the tenon fourth of twelve earthly branches structure fastening with crossbeam and longeron, realized the quick firm connection of crossbeam with the longeron to improved hookup location's structural strength, the assembly of crossbeam and longeron is still convenient for to the tenon fourth of twelve earthly branches structure simultaneously.

A storage device, further comprising: a support frame;

the support frame is provided with at least two support legs and a frame body which is arranged at the tops of the two support legs and is used for supporting the storage rack.

The utility model discloses a strorage device supports the storage rack through the support frame, makes placing and transporting of storage rack more convenient, has solved the storage rack and has deposited and transport inconvenient problem.

In one possible implementation, the storage device is a plurality of storage devices, and the storage devices are stacked on top of each other.

A plurality of storage devices are stacked up and down to be stored, so that the stacking space of the driving gears is reduced, and the space utilization rate in a workshop is improved.

In one possible implementation, the frame body is provided with vertical beams at the edges thereof; and lifting lugs for lifting are arranged on the vertical beams.

Through set up the lug on erecting the roof beam, the overhead traveling crane in the workshop of being convenient for carries out the handling to strorage device to realize strorage device's transportation, solved the problem of how quick handling of strorage device in the workshop.

In a possible implementation manner, the storage device is provided in plurality, a plurality of the storage devices are stacked up and down, and the vertical beam of the lower storage device and at least one support leg of the upper storage device can be sleeved together.

The support legs and the vertical beams of the storage device are stacked in a sleeved mode, so that the storage device is stable and reliable when stacked, and the operation safety of the storage device is improved.

In a possible implementation manner, the edge of the frame body is provided with vertical beams with the same number as the support legs, and each vertical beam corresponds to one support leg.

Through erecting roof beam and stabilizer blade one-to-one setting for strorage device when piling up, erect the roof beam and can cup joint one by one with the stabilizer blade, thereby improve strorage device's stability of structure.

In one possible implementation, the legs are formed as a hollow structure or a semi-enclosed structure, and the vertical beams of the lower storage unit are nested within the legs of the upper storage unit; or

The vertical beam is formed into a hollow or semi-surrounding structure, and the support legs of the upper-layer storage device are sleeved in the vertical beam of the lower-layer storage device.

The construction of the present invention and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a top view of a storage device according to an embodiment of the present invention;

fig. 2 is a front view of the storage device in an embodiment of the present invention;

fig. 3 is a side view of the storage device in an embodiment of the present invention;

FIG. 4 is a front view of the storage unit in another embodiment of the present invention;

FIG. 5 is a top view of another embodiment of the storage unit of the present invention;

FIG. 6 is a side view of a storage unit according to another embodiment of the present invention;

fig. 7 is a front view of a rack according to another embodiment of the present invention;

fig. 8 is a top view of a rack according to another embodiment of the present invention;

figure 9 is a side view of a rack in another embodiment of the invention;

figure 10 is a front view of the storage device of figure 4 in a stacked configuration in accordance with the present invention.

Reference numerals:

a storage rack-1;

a limiting groove-10;

a cross beam-11;

-a stringer-12;

a support block-13;

bevel or camber-111;

placing a rack-2;

a frame body-21;

a bottom frame plate-211;

a coaming-212;

a vertical beam-22;

a leg-23;

a lifting lug-24;

a driving gear-3.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Unless explicitly stated or limited otherwise, the terms "first," "second," and the like, as used herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or an implicit indication of a number of technical features.

The locomotive driving device needs to be overhauled after running for a certain time, wherein the overhaul comprises overhaul of a driving gear. The driving gear needs to be deposited or transported to a driving device assembly workshop through a tool after the completion of maintenance to be assembled, the commonly used tool for transferring or depositing is a turnover box, when a plurality of driving gears are placed in the turnover box simultaneously, in the transferring process, the driving gears do not fixedly move in the turnover box, so that the driving gears collide with one another at will, and the driving gears are damaged.

The utility model provides a strorage device based on above-mentioned problem, through placing every driving gear at a spacing inslot alone, this spacing groove can also restrict the removal of driving gear to the collision between each other has been avoided to the driving gear.

The first embodiment is as follows:

fig. 1 is a top view of a storage device according to the present embodiment; FIG. 2 is a front view of a storage device according to the present embodiment; fig. 3 is a side view of a storage device according to the present embodiment. Referring to fig. 1, 2 and 3, the storage device provided by the present embodiment includes a storage rack 1, where the storage rack 1 includes cross beams 11 and longitudinal beams 12, where a plurality of the cross beams 11 are arranged at intervals along a first direction (X direction in fig. 1), the plurality of the cross beams 11 are fastened together by the longitudinal beams 12 extending along the first direction to form a frame structure, and a limiting groove 10 for placing a driving gear 3 of a rail locomotive is defined between two adjacent cross beams 11.

In an alternative embodiment, the cross beam 11 and the longitudinal beam 12 may be configured as a cylindrical structure or a prismatic structure or other structural shapes for supporting, the cross beam 11 may be configured as a hollow or solid structure, and the strength of the cross beam 11 is based on the weight of the driving gear 3 capable of bearing the rail vehicle. Optionally, the cross beam 11 and the longitudinal beam 12 are both solid quadrangular prism structures, so as to facilitate processing and assembly.

Wherein, the cross beam 11 and the longitudinal beam 12 are made of low-hardness materials. For example, the material of the cross beam 11 and the material of the longitudinal beam 12 may be wood. The wooden material is easy to obtain and process, and can reduce the damage caused by friction in the contact process of the driving gear 3 and the limiting groove 10.

In some possible embodiments, when the longitudinal beams 12 are connected to the cross beam 11, the longitudinal beams 12 extend along a first direction, wherein the number of the longitudinal beams 12 can be two, and the longitudinal beams 12 can be connected to two end portions or a middle portion of the cross beam 11 to form a frame structure. Of course, the arrangement of the longitudinal beams 12 on the transverse beams 11 is not limited to the first direction, but may be other directions which are arranged at an angle smaller than 90 ° with respect to the first direction, specifically, the arrangement is subject to the condition that a plurality of transverse beams 11 arranged at intervals can be fastened to form a frame structure. Alternatively, the longitudinal beams 12 may also be a plurality of short beams disposed between two adjacent cross beams 11 in the first direction. Two adjacent crossbeams 11 are connected through the short beam, and then are connected with another crossbeam 11 through another short beam after the connection, and a plurality of short beams and crossbeam 11 interconnect constitution frame construction.

In the embodiment, a limiting groove 10 for placing the driving gear 3 of the railway locomotive is defined between two adjacent cross beams 11. The limiting groove 10 can separate two adjacent driving gears 3, so that the two adjacent driving gears 3 can keep a certain safety distance to prevent the driving gears 3 from colliding with each other. Alternatively, the retaining groove 10 may be configured as a recess that receives all or a portion of the drive gear 3.

In concrete implementation, if the driving gear 3 of the rail locomotive driving device is qualified after being overhauled from a production workshop, the driving gear needs to be transported from the production workshop to an assembly workshop to be assembled in the driving device. During the transport of the driving gears 3, a plurality of driving gears 3 can be arranged in different limiting grooves 10 on the storage rack 1 at the same time. The driving gear 3 includes gear portion and the connection axial region of setting on the gear portion axis, through placing driving gear 3 in spacing groove 10, can prevent that driving gear 3 from taking place to remove or roll at the in-process of transporting to the damage of driving gear 3 has been avoided.

In an alternative embodiment, the limiting groove 10 is a square groove formed by two adjacent cross beams 11 and partial longitudinal beams 12 arranged at the front and rear ends of the two cross beams 11, and the width of the limiting groove 10 can be set according to the size of the driving gear 3. For example, when the diameter of the addendum circle of the stored driving gear 3 is large, the stopper groove 10 satisfies a condition that the notch width is larger than the radius of the addendum circle of the gear portion and smaller than the diameter of the addendum circle of the gear portion, and at this time, the position limitation of the driving gear 3 is achieved by engaging the gear portion of the driving gear 3 in the stopper groove 10.

In order to avoid interference when two driving gears 3 with the same size are placed in two adjacent limiting grooves 10, the distance between the central lines of the two adjacent limiting grooves 10 is larger than the diameter of the largest gear, and the mutual interference can be avoided by placing the gear parts of the driving gears 3 in a manner of mutually staggering the first direction in the case that the transverse space of the limiting grooves 10 in the direction of the beam 11 is enough.

When the addendum circle diameter of the driving gear 3 of depositing is less, the addendum circle diameter of the gear portion of the driving gear 3 is less than the minimum opening width of the limiting groove 10, the gear portion of the driving gear 3 is suspended in the limiting groove 10, the driving gear 3 is supported on the longitudinal beam 12 arranged in front of and behind the limiting groove 10 through the connecting shaft portions at two ends of the driving gear 3, and in the transferring process, the blocking of the driving gear 3 is limited through two side walls of the limiting groove 10. Through the configuration, the reserved gap between the driving gear 3 and the limiting groove 10 on the two opposite surfaces is relatively small, and the driving gear 3 can be prevented from shaking in the limiting groove 10.

Referring to fig. 2, the surfaces of two adjacent beams 11 facing each other may be configured as an inclined plane or an arc surface, so that the limiting groove 10 forms an opening-shaped structure with a large top and a small bottom, since the opening angle of the limiting groove 10 gradually decreases from top to bottom, when the diameter of the tooth top circle of the gear portion of the driving gear 3 is large, the driving gear 3 may be clamped in the limiting groove 10, and the arrangement of the inclined plane or the arc surface facilitates the gear portion of the driving gear 3 to be arranged in the limiting groove 10, thereby realizing the position limitation of the driving gear 3. When the diameter of the addendum circle of the gear part of the driving gear 3 is smaller, the arrangement of the inclined surface or the cambered surface is convenient for the gear part of the driving gear 3 to be placed into the limiting groove 10, so that the contact between the connecting shaft part and the longitudinal beam 12 is realized, and the longitudinal beam 12 supports the driving gear 3.

Referring to fig. 1 and 2, alternatively, the bottom surface of the portion of the longitudinal beam 12 between two adjacent cross beams 11 is provided with a supporting block 13, the supporting block 13 may be, for example, a square block, the top of which is in contact with the bottom of the longitudinal beam 12, and the bottom of which is flush with the bottom of the cross beam 11, and the supporting block 13 is disposed between two adjacent cross beams 11, for example, in the middle of the portion of the longitudinal beam 12 between two adjacent cross beams 11. The support blocks 13 are used for providing additional support for the longitudinal beams 12, so that the driving gear 3 can be prevented from fracturing the longitudinal beams 12, in other words, the support blocks 13 are used for supporting the parts of the longitudinal beams 12 supporting the connecting shaft parts, and the structural reinforcement of the longitudinal beams 12 is realized.

Alternatively, the supporting blocks 13 may be provided as two oppositely arranged triangular reinforcing rib structures, which are respectively arranged in the right-angle openings at the joints of the longitudinal beams 12 and the cross beams 11, or in other supporting forms capable of reinforcing the longitudinal beams 12.

Referring to fig. 2 and 3, the cross beam 11 and the longitudinal beam 12 may be fastened and connected through a mortise and tenon structure. An optional realization mode of this tenon fourth of twelve earthly branches structure does, set up the recess that extends towards the first direction at crossbeam 11 top surface, set up at longeron 12 with recess shape assorted protruding structure, when connecting, longeron 12 is injectd in this recess through this protruding structure. Optionally, additional fastening connection can be made at the mortise structure by a fastening member such as a screw.

Another optional implementation manner of the mortise and tenon structure is that a groove is formed in the longitudinal beam 12, and a protruding structure matched with the groove in shape is formed in the cross beam 11. Optionally, additional fastening connection can be made at the mortise structure by a fastening member such as a screw.

In another possible implementation manner of the mortise and tenon structure, a groove is formed in a part of a connection position of the cross beam 11 and the longitudinal beam 12, a protruding structure is formed in a corresponding connection position of the longitudinal beam 12 and the cross beam 11, and the groove in the cross beam 11 is matched with the protruding structure in the longitudinal beam 12. Optionally, additional fastening connection can be made at the mortise structure by a fastening member such as a screw.

The mortise and tenon structure in this embodiment can be further configured to other forms capable of fastening the longitudinal beam 12 and the cross beam 11, which are not described in detail in this embodiment.

Example two:

FIG. 4 is a front view of the storage device according to the present embodiment; FIG. 5 is a top view of the storage device according to the present embodiment; FIG. 6 is a side view of a storage unit according to this embodiment; fig. 7 is a front view of the placement frame provided in this embodiment; fig. 8 is a top view of the placement frame provided in this embodiment; figure 9 is a side view of a placement frame according to the present embodiment; fig. 10 is a front view of the storage unit of fig. 4 in a stacked condition. Referring to fig. 4 to 10, the embodiment provides a storage device, which comprises a rack 2 and a storage rack 1 in the first embodiment, wherein the rack 2 is provided with a support leg 23, and a frame 21 for supporting the storage rack 1 is arranged on the support leg 23.

Referring to fig. 7 to 9, the frame body 21 may be provided as a frame-like structure for supporting the storage rack 1, wherein the frame body 21 includes a bottom frame plate 211 and a surrounding plate 212 surrounding the outer edge of the bottom frame plate, and the bottom of the storage rack 1 is disposed in a space defined by the surrounding plate 212. The storage rack 1 is supported by a bottom frame plate 211, and is surrounded by a surrounding plate 212 around the storage rack 1 to restrict the movement of the storage rack 1.

With continued reference to fig. 7-9, in an alternative embodiment, the legs 23 can be disposed on the bottom or side of the frame 21, and the legs 23 can be connected to the frame 21 by welding or fastening with fasteners such as screws. Alternatively, the number of the legs 23 may be four, respectively provided at four supporting positions of the frame body 21. Optionally, the shape of the supporting leg 23 may be a cylindrical structure, a cylindrical structure or a semi-surrounding structure, and may also be other structural forms that can be used for supporting, and therefore, the description is omitted here.

With continued reference to fig. 7-9, the rack 2 is configured to facilitate the hoisting of the storage device by the overhead travelling crane, wherein the frame 21 may further be provided with four vertical beams 22, and the vertical beams 22 may be provided on the top surface or the side surface of the frame 21. In the present embodiment, the lifting lugs 24 are connected to the side walls of all the vertical beams 22 or a part of the vertical beams 22, and the lifting lugs 24 may be configured as a closed loop structure or a downward-opening hook structure. When the storage device needs to be transported, a lifting hook or a lifting rope arranged on the crown block is connected with the lifting lug 24 and lifted, so that the storage device is moved.

In a possible implementation manner, the shape of the vertical beam 22 may be configured as a column structure, a cylindrical structure or a semi-surrounding structure, and may also be configured as other structural forms capable of being provided with lifting lugs. In order to prevent the vertical beam 22 from deforming during the hoisting process, the vertical beam has to have certain structural strength.

Referring to fig. 10, the rack 2 may be configured in a structure facilitating stacking of the storage devices one above another in the present embodiment. The storage device is stacked up and down, so that the accumulation of the storage device is reduced, and the space utilization rate in a workshop is increased.

One possible stacking form of the storage device is that the rack 2 comprises a frame body 21 and support legs 23 arranged on the frame body 21, the storage rack 1 is arranged on the frame body 21, the upper storage device and the lower storage device are stacked layer by layer through the support of the support legs 23, and in the above configuration, the height of the support legs 23 is higher than that of the bottom of the upper frame body 21 and the driving gear arranged on the storage rack 1 are not interfered. The legs 23 of the upper tier storage unit are disposed on the frame 21 of the lower tier storage unit when the storage units are stacked.

Another possible stacking configuration of the storage device is that the rack 2 comprises a frame 21, legs 23 arranged on the frame 21, and vertical beams 22 arranged on the frame 21, the number of the vertical beams 22 and the number of the legs 23 being the same, and each vertical beam 22 corresponds to one leg 23. In an alternative embodiment, the legs 23 of the upper storage unit are nested with the corresponding vertical beams 22 of the lower storage unit when the storage units are stacked. The stack structure can improve the stability and reliability of the stack, and the multilayer storage device can not topple over due to dislocation of the stack when in transfer.

In particular, in one possible implementation, the feet 23 at the bottom of the rack 2 are provided as hollow structures, such as cylindrical structures, and the vertical beams 22 on the top of the rack 2 are provided as cylindrical structures. When the storage units are stacked, the vertical beams 22 of the lower storage unit can be sleeved in the support legs 23 of the upper storage unit, and the columnar structure of the vertical beams 22 is matched with the hollow structure of the support legs 23.

In another possible implementation, the vertical beams 22 at the top of the rack 2 are provided as hollow structures, such as cylindrical structures, and the legs 23 at the bottom of the rack 2 are provided as cylindrical structures. When the storage units are stacked, the vertical beams 22 of the lower storage unit are sleeved in the support legs 23 of the upper storage unit, and the columnar structures of the support legs 23 are matched with the hollow structures of the vertical beams 22.

In yet another possible realisation the legs 23 at the bottom of the rack 2 are arranged in a semi-enclosed configuration, for example a configuration with a substantially L-shaped or C-shaped cross-section, and the vertical beams 22 at the top of the rack 2 are also arranged in a substantially L-shaped or C-shaped configuration. When the storage units are stacked, the enclosing structure of the vertical beams 22 of the lower storage unit is inserted into the semi-enclosed receptacle of the support 23 of the upper storage unit, wherein the outer contour of the semi-enclosing structure of the vertical beams 22 is in contact with the inner contour provided on the vertical beams 22.

In yet another possible realisation the vertical beams 22 at the top of the rack 2 are arranged in a semi-enclosed configuration, for example a configuration with a substantially L-shaped or C-shaped cross-section, and the legs 23 on the bottom of the rack 2 are also arranged in a substantially L-shaped or C-shaped configuration. When the storage units are stacked, the half-enclosed structure of the legs 23 of the upper storage unit is inserted into the half-enclosed receptacle of the vertical beams 23 of the lower storage unit, wherein the outer contour surfaces of the legs 23 of the upper storage unit are arranged in contact with the inner contour surfaces of the vertical beams 22 of the lower storage unit.

Schematically, if an operator places the driving gear 3 in the limiting groove 10 of the storage rack 1 after the driving gear 3 is overhauled in a production workshop, the storage rack 1 is arranged on the placing rack 2 at the moment, and after all the limiting grooves 10 on the storage rack 1 are filled, the lifting hook of the crown block is used for connecting the lifting lug 24 on the placing rack 2, so that the storage device is stably lifted to the driving device assembling area for assembling; when mass production, there are a large amount of accessories in the drive arrangement equipment district, for not taking up the production area, can range upon range of the strorage device from top to bottom, preferentially use the driving gear 3 in the highest department strorage device.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. The storage device is characterized by comprising a storage rack, wherein the storage rack comprises cross beams and longitudinal beams, the cross beams are arranged at intervals along a first direction and are fastened together through the longitudinal beams extending along the first direction to form a frame structure, and a limiting groove for placing a driving gear of a railway locomotive is defined between every two adjacent cross beams.

2. The storage device as claimed in claim 1, wherein surfaces of adjacent two of the cross members facing each other are configured as slopes or arcs.

3. The storage device as claimed in claim 1, wherein a support block is provided on a bottom surface of a portion of the longitudinal beam between adjacent two of the lateral beams.

4. The storage device as claimed in claim 1, wherein the cross member is fixedly connected to the longitudinal member by a mortise and tenon joint structure.

5. The storage device of any one of claims 1 to 4, comprising: a support frame;

the support frame is provided with at least two support legs and a frame body which is arranged at the tops of the two support legs and is used for supporting the storage rack.

6. The storage unit of claim 5, wherein the storage unit is a plurality of storage units stacked one above the other.

7. The storage device of claim 5, wherein the frame is provided with vertical beams at its edges; and lifting lugs for lifting are arranged on the vertical beams.

8. The storage unit of claim 7, wherein the storage unit is a plurality of storage units stacked one above the other, and the vertical beams of the lower storage unit and the at least one leg of the upper storage unit are nestable together.

9. The storage device of claim 8, wherein the frame is provided at its edges with the same number of vertical beams as the number of legs, each vertical beam corresponding to one of the legs.

10. The storage unit of claim 8 wherein the legs are formed as a hollow structure or a semi-enclosed structure and the vertical beams of a lower storage unit are nested within the legs of an upper storage unit; or

The vertical beam is formed into a hollow or semi-surrounding structure, and the support legs of the upper-layer storage device are sleeved in the vertical beam of the lower-layer storage device.

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