CN210556761U - Food detection sample save set - Google Patents

Food detection sample save set Download PDF

Info

Publication number
CN210556761U
CN210556761U CN201921492885.6U CN201921492885U CN210556761U CN 210556761 U CN210556761 U CN 210556761U CN 201921492885 U CN201921492885 U CN 201921492885U CN 210556761 U CN210556761 U CN 210556761U
Authority
CN
China
Prior art keywords
box body
food
transverse plate
sliding
fixedly connected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201921492885.6U
Other languages
Chinese (zh)
Inventor
黄海丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201921492885.6U priority Critical patent/CN210556761U/en
Application granted granted Critical
Publication of CN210556761U publication Critical patent/CN210556761U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

The utility model discloses a food detection sample storage device in the technical field of food detection, which comprises a box body, a box door hinged at the front side of the box body and a door handle arranged at the right end of the front side of the box door, wherein the inner cavity of the box body is transversely and fixedly connected with a transverse plate, the top of the transverse plate is provided with a vent hole, the middle part of the left side of the box body is embedded with a semiconductor refrigeration sheet, the left side of the semiconductor refrigeration sheet is fixedly provided with a cooling fan, the bottom of the left side of the box body is fixedly provided with a lithium battery, the output end of the lithium battery is electrically connected with the input ends of the semiconductor refrigeration sheet and the cooling fan, the food detection sample storage device can discharge the air in a liquid storage device when storing liquid food, the storage time of the liquid food is prolonged, the storage space of a, the operation of the user is facilitated, and the practicability of the food detection sample storage device is improved.

Description

Food detection sample save set
Technical Field
The utility model relates to a food detection technology field specifically is a food detection sample save set.
Background
The broad food inspection refers to a subject for studying and evaluating food quality and its changes, which inspects the quality of food raw materials, auxiliary materials, semi-finished products, finished products and by-products according to some basic theories of physics, chemistry, biochemistry and various technologies and established technical standards, such as international and national food sanitation/safety standards, to ensure the quality of the products to be qualified. The food inspection contents comprise sensory detection of food, detection of nutrient components, additives and harmful substances in the food and the like.
Need use save set to preserve food sample when food detects, but traditional sample save set can not be equipped with the air escape in the liquid food container to can not adjust solid food's the space of placing, make the user need cut solid food into the fritter sample with solid food and preserve, be unfavorable for food sample's preservation, reduced food and detected sample save set's practicality.
Based on this, the utility model designs a specifically be a food detection sample save set to solve above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a food detection sample save set to solve the air escape in the liquid food container that traditional sample save set who proposes in the above-mentioned background art can not be equipped with, and can not adjust the space of placing of solid state food, make the user need cut into the problem that the fritter sample was preserved with solid state food.
In order to achieve the above object, the utility model provides a following technical scheme: a food detection sample storage device comprises a box body, a box door hinged on the front side of the box body and a door handle arranged at the right end of the front side of the box door, wherein a transverse plate is transversely and fixedly connected with an inner cavity of the box body, air holes are formed in the top of the transverse plate, a semiconductor refrigeration sheet is embedded in the middle of the left side of the box body, a cooling fan is fixedly installed on the left side of the semiconductor refrigeration sheet, a lithium battery is fixedly installed at the bottom of the left side of the box body, the output end of the lithium battery is electrically connected with the input ends of the semiconductor refrigeration sheet and the cooling fan, a base is fixedly connected with the bottom of the inner cavity of the box body, a plurality of arc-shaped grooves are transversely arranged at equal intervals on the top of the base, a lower pressing block with a bottom semicircular groove is arranged right above the arc-shaped grooves, two sides of the top of the, the top of the transverse plate is connected with a plurality of partition plates in a sliding mode, the front side and the rear side of the top of the transverse plate are respectively provided with a sliding groove a, the front side and the rear side of the top of the inner cavity of the box body are respectively provided with a sliding groove b, the two sides of the bottom of each partition plate are respectively fixedly connected with a sliding block a in sliding connection with the sliding grooves a, the two sides of the top of each partition plate are respectively fixedly connected with a sliding block b in sliding connection with the sliding grooves b, the front side of the transverse plate is provided with a communicating groove communicated with the sliding groove a in the front side of the transverse plate, the sliding block a in the sliding groove a in the front side of the transverse plate is provided with a;
the liquid storage device comprises a barrel body, a thread groove is formed in the inner wall of the barrel body, a round convex block is connected to the inner cavity of the thread groove in a threaded mode, a through hole is formed in the central axis of the round convex block, and an upper cover is connected to the top end of the round convex block in a threaded mode.
Preferably, the number of the arc-shaped grooves is four, the arc-shaped grooves, the inner wall and the inner wall of the lower pressing block are fixedly connected with protection pads, and the protection pads are rubber pads.
Preferably, the elastic part comprises a shell with the top fixed with the transverse plate, the bottom of the inner cavity of the shell is slidably connected with a round block, the top of the round block is provided with a spring and a bottom fixedly connected with connecting rod, and the bottom end of the connecting rod penetrates through the bottom of the shell and is fixedly connected with the lower pressing block.
Preferably, the number of the door handles is three.
Preferably, a handle is fixedly installed at the center of the top of the box body.
Preferably, four corners of the bottom of the box body are fixedly connected with supporting blocks.
Preferably, the depth of the thread groove is four fifths of the depth of the inner cavity of the barrel body.
Preferably, the length of the communication groove is the same as the length of the sliding groove a.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model can refrigerate the box body through the matching of the semiconductor refrigerating sheet, the cooling fan and the lithium battery, thereby enabling the device to refrigerate food; through the arrangement of the liquid storage device, the liquid food sample can be stored, and air in the liquid food sample is discharged during storage, so that the storage time of the liquid food sample is prolonged; the base, the elastic piece and the lower pressing block are matched for use, so that the position of the liquid storage device can be fixed, the liquid storage device is more stable during storage, and the liquid storage device is transversely arranged, so that the occupied space of the box body is greatly reduced; through the matched use of the transverse plate, the partition plates, the sliding grooves b, the sliding blocks a, the sliding blocks b and the fastening bolts, the plurality of partition plates can be moved on the transverse plate, and the positions of the partition plates are fixed by the fastening bolts, so that the storage space of the solid food sample is adjustable; this food detection sample save set can be when preserving liquid food with the air escape among the stock solution device, the save time of extension liquid food to the storage space of solid state food sample is adjustable, and the person of facilitating the use preserves the solid state food of equidimension not, and the person of facilitating the use operates, has improved food detection sample save set's practicality.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the utility model with the door removed;
FIG. 3 is a front sectional view of the present invention;
FIG. 4 is a schematic sectional view of the liquid storage device of the present invention;
FIG. 5 is a schematic sectional view of the elastic member of the present invention;
FIG. 6 is a schematic perspective view of the structure of the horizontal plate and the partition plate of the present invention;
fig. 7 is a schematic perspective view of another view angle of the horizontal plate and the partition plate structure of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. a box body; 2. a box door; 3. a door handle; 4. a transverse plate; 41. air holes are formed; 42. a chute a; 43. a communicating groove; 5. a semiconductor refrigeration sheet; 6. a heat radiation fan; 7. a lithium battery; 8. a protection pad; 9. a base; 91. an arc-shaped slot; 10. an elastic member; 101. a housing; 102. a spring; 103. a round block; 104. a connecting rod; 11. pressing the block; 12. a liquid storage device; 121. a barrel body; 122. a round bump; 123. a through hole; 124. an upper cover; 13. a partition plate; 14. a chute b; 15. a slide block a; 16. a slide block b; 17. fastening a bolt; 18. a handle; 19. and (7) a supporting block.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a food detection sample storage device comprises a box body 1, a box door 2 hinged on the front side of the box body 1 and a door handle 3 arranged at the right end of the front side of the box door 2, wherein the locking mode and the sealing mode of the box body 1 and the box door 2 are the prior art in the field, so that the locking mode and the sealing mode are not described, a handle 18 is fixedly arranged at the center of the top of the box body 1, a user can conveniently lift the box body 1 by arranging the handle 18, supporting blocks 19 are fixedly connected to four corners of the bottom of the box body 1, the supporting effect on the box body 1 is achieved by arranging the supporting blocks 19, the bottom of the box body 1 is prevented from directly contacting with the supports, the bottom surface of the box body 1 is protected, a transverse plate 4 is transversely and fixedly connected to the inner cavity of the box body 1, air holes 41 are formed in the top of the transverse plate 4, a semiconductor refrigeration piece 5 is, the bottom of the left side of the box body 1 is fixedly provided with a lithium battery 7, the output end of the lithium battery 7 is electrically connected with the input ends of the semiconductor refrigerating sheet 5 and the radiating fan 6, the lithium battery 7 is used for electrifying the semiconductor refrigerating sheet 5 and the radiating fan 6, the semiconductor refrigerating sheet 5 is used for refrigerating air in the inner cavity of the box body 1, and the fan of the radiating fan 6 rotates to conduct heat on the semiconductor refrigerating sheet 5 to the outside of the box body 1;
the bottom of the inner cavity of the box body 1 is fixedly connected with a base 9, the top of the base 9 is transversely provided with four arc-shaped grooves 91 at equal intervals, a lower pressing block 11 with a bottom semicircular groove is arranged right above the arc-shaped grooves 91, two sides of the top of the lower pressing block 11 are fixedly connected with the bottom of the transverse plate 4 through elastic pieces 10, the inner cavities of the arc-shaped grooves 91 and the lower pressing block 11 are provided with liquid storage devices 12, specifically, each elastic piece 10 comprises a shell 101, the top of the inner cavity of the shell 101 is fixedly connected with a round block 103, the top of the round block 103 is provided with a spring 102, the bottom is fixedly connected with a connecting rod 104, the bottom end of the connecting rod 104 penetrates through the bottom of the shell 101 and is fixedly connected with the lower pressing block 11, through the arrangement of the elastic pieces 10, when the liquid storage devices 12 are placed between the arc-shaped grooves 91 and the lower pressing block 11, a user upwards moves the lower pressing block 11, the lower pressing block 11 drives, the round block 103 drives the spring 102 to compress, then the liquid storage device 12 is placed in the arc-shaped groove 91, the lower pressing block 11 is loosened, the round block 103, the connecting rod 104 and the lower pressing block 11 are driven to move downwards by the elasticity of the spring 102, the lower pressing block 11 is further enabled to press the liquid storage device 12 downwards to fix the position of the liquid storage device, the arc-shaped groove 91, the inner wall of the lower pressing block 11 and the inner wall of the lower pressing block are fixedly connected with a protective pad 8, the protective pad 8 is a rubber pad, the liquid storage device 12 is protected by the arrangement of the rubber pad, meanwhile, the friction force between the base 9 and the inner wall of the lower pressing block 11 and the liquid storage device 12 is increased, and the phenomenon that the liquid storage device 12 deviates when;
three partition plates 13 are slidably connected to the top of the transverse plate 4, sliding grooves a42 are respectively formed in the front side and the rear side of the top of the transverse plate 4, sliding grooves b14 are respectively formed in the front side and the rear side of the top of the inner cavity of the box body 1, sliding blocks a15 slidably connected with the sliding grooves a42 are respectively fixedly connected to the two sides of the bottom of the partition plate 13, sliding blocks b16 slidably connected with the sliding grooves b14 are respectively fixedly connected to the two sides of the top of the partition plate 13, a communicating groove 43 communicated with the sliding grooves a42 in the front side of the transverse plate 4 is formed in the front side of the transverse plate 4, the length of the communicating groove 43 is the same as that of the sliding grooves a42, threaded holes are formed in the sliding blocks a15 in the sliding grooves a42 in the front side of the transverse plate 4, fastening bolts 17 are threadedly connected to the inner cavities of the threaded holes, the fastening bolts 17 penetrate through the, the fastening bolt 17 is enabled to move outwards, then the partition plate 13 is pushed to move left and right on the transverse plate 4, the partition plate 13 drives the sliding block a15 and the sliding block b16 to respectively slide left and right in the sliding groove a42 and the sliding groove b14, and then the fastening bolt 17 is rotated reversely, so that the fastening bolt 17 moves inwards and is in close contact with the transverse plate 4, and the effect of fixing the position of the partition plate 13 is achieved;
the liquid storage device 12 comprises a barrel body 121, a threaded groove is formed in the inner wall of the barrel body 121, the depth of the threaded groove is four fifths of the depth of the inner cavity of the barrel body 121, a round bump 122 is in threaded connection with the inner cavity of the threaded groove, a through hole 123 is formed in the central axis of the round bump 122, an upper cover 124 is in threaded connection with the top end of the round bump 122, through the arrangement of the liquid storage device 12, when a user stores a liquid food sample, the round bump 122 is firstly screwed out of the threaded groove of the barrel body 121, then the liquid food sample is poured into the barrel body 121, the round bump 122 is screwed into the threaded groove of the barrel body 121, the round bump 122 moves downwards to be in contact with the liquid food, air between the round bump 122 and the food is squeezed out from the through hole 123, the round bump 122 continues to move downwards, the liquid level of the liquid food is moved to the top opening of the through hole 123, and finally the upper cover 124 is, thereby reducing the contact between the liquid food in the liquid storage device 12 and the air and prolonging the preservation time of the liquid food.
One specific application of this embodiment is: the semiconductor refrigerating sheet 5 and the cooling fan 6 are electrified through the lithium battery 7, the semiconductor refrigerating sheet 5 refrigerates air in the inner cavity of the box body 1, and the fan of the cooling fan 6 rotates to conduct heat on the semiconductor refrigerating sheet 5 to the outside of the box body 1, so that the effect of refrigerating the box body 1 is achieved, and food in the box body 1 is refrigerated and stored;
when the liquid food is stored, the round bump 122 is firstly screwed out of the threaded groove of the barrel body 121, then the liquid food sample is poured into the barrel body 121, then the round bump 122 is screwed into the threaded groove of the barrel body 121, so that the round bump 122 moves downwards to be contacted with the liquid food, air between the round bump 122 and the food is extruded out of the through hole 123, the round bump 122 continues to move downwards, the liquid level of the liquid food moves to the top opening of the through hole 123, and finally the upper cover 124 is screwed at the top end of the round bump 122 to seal the liquid storage device 12, so that the contact between the liquid food in the liquid storage device 12 and the air is reduced, and the storage time of the liquid food is prolonged; then the lower pressing block 11 is lifted upwards, the lower pressing block 11 drives the round block 103 to slide upwards in the inner cavity of the shell 101 through the connecting rod 104, the round block 103 drives the spring 102 to compress, then the liquid storage device 12 is placed in the arc-shaped groove 91, the lower pressing block 11 is loosened, the round block 103, the connecting rod 104 and the lower pressing block 11 are driven to move downwards by the elasticity of the spring 102, and then the lower pressing block 11 presses the liquid storage device 12 downwards to fix the position of the liquid storage device, so that the liquid food sample can be stored;
when the solid food is preserved, the user rotates the fastening bolt 17, and uses the threaded fit of the fastening bolt 17 and the threaded hole of the slide block a15, so that the fastening bolt 17 moves outwards, then pushes the three separation plates 13 to move rightwards on the transverse plate 4, the separation plate 13 drives the slide block a15 and the slide block b16 to slide rightwards in the slide slot a42 and the slide slot b14 respectively, so that the three separation plates 13 are all positioned at the right end of the transverse plate 4, then the first solid food sample is placed at the left side of the top of the transverse plate 4, then the separation plate 13 positioned at the leftmost side moves leftwards until the separation plate 13 is contacted with the first solid food, and then the fastening bolt 17 is rotated reversely, so that the fastening bolt 17 moves inwards and is tightly contacted with the transverse plate 4, and the effect of fixing the position of the leftmost separation plate 13 is achieved, and thus, the second solid food can be placed between the leftmost separation, the third solid food is placed between the middle separation plate 13 and the rightmost separation plate 13, and the fourth solid food is placed on the right side of the rightmost separation plate 13, so that the effect of adjusting the storage space of the solid food can be achieved, and convenience is brought to a user to adjust the storage space according to the size difference of the solid food.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (8)

1. The utility model provides a food detection sample save set, includes box (1), articulates chamber door (2) and door handle (3) of setting at chamber door (2) front side right-hand member in box (1) front side, its characterized in that: the inner cavity of the box body (1) is transversely and fixedly connected with a transverse plate (4), the top of the transverse plate (4) is provided with air holes (41), the left middle part of the box body (1) is embedded with a semiconductor refrigerating sheet (5), the left side of the semiconductor refrigerating sheet (5) is fixedly provided with a cooling fan (6), the left bottom of the box body (1) is fixedly provided with a lithium battery (7), the output end of the lithium battery (7) is electrically connected with the input ends of the semiconductor refrigerating sheet (5) and the cooling fan (6), the bottom of the inner cavity of the box body (1) is fixedly connected with a base (9), the top of the base (9) is transversely provided with a plurality of arc-shaped grooves (91) at the same intervals, a lower pressing block (11) with a bottom semicircular groove is arranged right above the arc-shaped grooves (91), and both sides of the top of the lower pressing block (11) are fixedly connected with the bottom of the, the inner cavities of the arc-shaped groove (91) and the lower pressing block (11) are provided with a liquid storage device (12), the top of the transverse plate (4) is connected with a plurality of partition plates (13) in a sliding manner, sliding grooves a (42) are formed in the front side and the rear side of the top of the transverse plate (4), sliding grooves b (14) are formed in the front side and the rear side of the top of the inner cavity of the box body (1), sliding blocks a (15) in sliding connection with the sliding grooves a (42) are fixedly connected to the two sides of the bottom of the partition plates (13), sliding blocks b (16) in sliding connection with the sliding grooves b (14) are fixedly connected to the two sides of the top of the partition plates (13), a communicating groove (43) communicated with the sliding grooves a (42) in the front side of the transverse plate (4) is formed in the front side of the transverse plate (4), a threaded hole is formed in the sliding block a (15) in the sliding, the fastening bolt (17) penetrates through the communication groove (43) and extends to the outer side of the transverse plate (4);
the liquid storage device (12) comprises a barrel body (121), a thread groove is formed in the inner wall of the barrel body (121), a round convex block (122) is connected to the inner cavity of the thread groove in a threaded mode, a through hole (123) is formed in the central axis of the round convex block (122), and an upper cover (124) is connected to the top end of the round convex block (122) in a threaded mode.
2. The food testing sample holding device of claim 1, wherein: the quantity of arc wall (91) is four, and the inner wall fixedly connected with protection pad (8) of arc wall (91) and inner wall and lower briquetting (11), protection pad (8) are the rubber pad.
3. The food testing sample holding device of claim 2, wherein: elastic component (10) include top and fixed casing (101) of diaphragm (4), the bottom sliding connection of casing (101) inner chamber has circle piece (103), the top of circle piece (103) is provided with spring (102), bottom fixedly connected with connecting rod (104), the bottom of connecting rod (104) run through to the bottom of casing (101) and with lower briquetting (11) fixed connection.
4. The food testing sample holding device of claim 3, wherein: the number of the door handles (3) is three.
5. The food testing sample holding device of claim 4, wherein: a handle (18) is fixedly arranged at the center of the top of the box body (1).
6. The food testing sample holding device of claim 5, wherein: supporting blocks (19) are fixedly connected to four corners of the bottom of the box body (1).
7. The food testing sample holding device of claim 6, wherein: the depth of the thread groove is four fifths of the depth of the inner cavity of the barrel body (121).
8. The food testing sample holding device of claim 7, wherein: the length of the communication groove (43) is the same as that of the chute a (42).
CN201921492885.6U 2019-09-09 2019-09-09 Food detection sample save set Expired - Fee Related CN210556761U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921492885.6U CN210556761U (en) 2019-09-09 2019-09-09 Food detection sample save set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921492885.6U CN210556761U (en) 2019-09-09 2019-09-09 Food detection sample save set

Publications (1)

Publication Number Publication Date
CN210556761U true CN210556761U (en) 2020-05-19

Family

ID=70631122

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921492885.6U Expired - Fee Related CN210556761U (en) 2019-09-09 2019-09-09 Food detection sample save set

Country Status (1)

Country Link
CN (1) CN210556761U (en)

Similar Documents

Publication Publication Date Title
WO2003025479A3 (en) All purpose portable ice chest
CN210556761U (en) Food detection sample save set
CN211919607U (en) Poultry animal doctor is with classifiable bacterin strorage device
CN210734835U (en) Glutamine transaminase storage tank
CN211120202U (en) Fridge that influenza vaccine experiments were used
CN214148494U (en) A freezer for agricultural product sampling censorship
CN101063574B (en) Cooler box
CN110065715B (en) Polystyrene fresh-keeping box
CN210168876U (en) Dough kneading bowl and dough kneading device
CN210213326U (en) Polystyrene preservation box
CN218915500U (en) Refrigerating box
CN217261488U (en) Reagent placing box for environmental monitoring
CN207936570U (en) A kind of stem cell medicine refrigerated transport case of high intensity
CN213621360U (en) Multi-temperature cold storage box with flexible space
CN214494024U (en) Moisture-proof cake box
CN210883514U (en) Agricultural product preservation sample box
CN218559888U (en) Cell storage refrigeration tank with good sealing performance
CN211091800U (en) Dryer for dehydrated fruits and vegetables
CN219474040U (en) Stem cell exosome freezing mechanism
CN212057881U (en) Plastic fruit and vegetable box of multi-section refrigerator
CN209192585U (en) It is a kind of for extracting the low temperature the storage box of tissue
CN216375493U (en) Medicine storage box with classification function
CN213789021U (en) Disinfection tray that medical science inspection was used
CN221139417U (en) Procalcitonin detection kit
CN214453019U (en) Food detection sample save set

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200519