CN103321488A - Plain-secret dual-coded mechanical lock - Google Patents
Plain-secret dual-coded mechanical lock Download PDFInfo
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- CN103321488A CN103321488A CN2013102750328A CN201310275032A CN103321488A CN 103321488 A CN103321488 A CN 103321488A CN 2013102750328 A CN2013102750328 A CN 2013102750328A CN 201310275032 A CN201310275032 A CN 201310275032A CN 103321488 A CN103321488 A CN 103321488A
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Abstract
The invention relates to a plain-secret dual-coded mechanical lock in the technical field of articles of everyday use. The plain-secret dual-coded mechanical lock comprises a cavity, a rotating gear disc, a lock cylinder, a warp plate mechanism and a pressing mechanism, wherein the cavity is formed by an upper base plate mechanism and a lower base plate mechanism, and the rotating gear disc, the lock cylinder, the warp plate mechanism and the pressing mechanism are positioned in the cavity. The lower base plate mechanism comprises three groups of lower positioning mechanisms in central symmetry and uniform distribution, and each group of lower positioning mechanisms comprises a code drive plate positioning cylinder, a warp plate positioning base, a first elastic part positioning convex hole and two retaining plates; in each group of lower positioning mechanism, the two retaining plates are arranged on two sides of the corresponding first elastic part positioning convex hole respectively and disposed between the warp plate positioning bases of two adjacent groups of lower positioning mechanisms; the wrap plate positioning bases, the first elastic part positioning convex holes and the retaining plates of the three groups of lower positioning mechanisms form a triangular structure, and the code drive plate positioning cylinders are disposed outside the triangular structure. An original single-layer code lock structure is abandoned, a second-layer code is introduced, and innovation of the coded lock principle and improvement of safety performance of the coded lock are achieved by means of introducing a logic sequence during code inputting through the second-layer code.
Description
Technical field
What the present invention relates to is the lockset of one way of life articles for use technical field, specifically a kind of light and shade dual coding mechanical lock.
Background technology
Coded lock is easy with it, and the overwhelming majority that small and exquisite characteristics are applicable to daily life and work and study needs the field of application lock.The principle of existing dial type coded lock all is similar: coded lock limits the release of lock core by the password driver plate, namely unblank.The password driver plate is divided into ten five equilibriums, corresponding password 0 to 9, and password driver plate inner ring has a groove, numeral, i.e. a password on corresponding the driver plate.When all passwords all pushed the precalculated position, all grooves were lined up a line, and at this moment, lock core just can be released by the passage that groove forms, and reaches the purpose of unblanking.Yet the deficiency of existing lock and defective also are significant.The first, coded lock reaches the purpose of encryption by password, and is as broad as long between password and the password.That is to say, only the password of each all need to be inputted correctly, lock just can be opened.So in case password is spied upon by others, if Modify password not, others just can open coded lock.And in a single day coded lock is in opening, and its password generally is to be in correct position.At this moment, other people can spy upon password easily, cause password to reveal.The second, the password combination of coded lock is that the figure place by password determines.The coded lock of three common passwords on the market, its password combination number is 10
3Kind, this explanation: (1) each password combination is that the probability of correct combination is
(2) the manufacturer production same is locked, and can produce at most the coded lock of 1000 kinds of different initial passwords.
Although the figure place that increases password can increase the number of combinations of password, reduces the probability that the password cover is opened.But meanwhile, the user must remember more password, and its possibility that forgets Password also increases simultaneously; When unblanking, also need more to operate, bring inconvenience.Because coded locks most on the market all are three-figure, people have formed custom to three-figure password, can make number of combinations increase by ten times even increase a password, but producer generally also can not produce the coded lock of four passwords.This shows, improve coded lock in the principle of existing coded lock and be difficult to carry out.
Find through the retrieval to prior art, Chinese patent literature CN2878608, open day 2007-03-14, a kind of rotary mechanical puzzle lock is disclosed, forming folding between the dead bolt of major part and the lock core cooperates, be characterised in that lock core is to be made of rotating disk, cipher ring group, cylinder, snap close, spring type clamping bead, the cipher ring group is the donut that anchor ring flushes in this mechanism, be enclosed within on the protruding axle of cylinder end face, cipher ring group overcoat has rotating disk, all is milled with recess on rotating disk rim and the annulus anchor ring and is close to the cylinder end face; Equally distributed small cylindrical tank is with turntable rotation angle quantification on spring type clamping bead on the cylinder and the rotating disk rim.The cylinder eccentric position is equipped with through hole, rotating disk drives the annulus rotation by the projection that embeds in the arc chute that has on the annulus, rotating disk whenever turns over certain small cylindrical tank number, begin to finish to rotating disk self from interior annulus, each recess enters successively the groove combination position and is combined into groove at last under through hole, snap close is fallen, disconnect dead bolt.But this technology does not change single layer coding, for the opening ways of understanding this lock and peep surreptitiously and to the people of password, still can open coded lock, based on the consideration to confidentiality and the operability of coded lock, be necessary that the order that will input password is incorporated among the coding, from the unlocking mechanism of principle innovation coded lock.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of light and shade dual coding mechanical lock is proposed, the present invention has abandoned the lock construction of original individual layer password, introduce second layer password, the logical order when introducing Password Input by second layer password realizes the innovation of coded lock principle and the raising of coded lock security performance.
The present invention is achieved by the following technical solutions, the present invention includes: top bottom-disc mechanism, low bottom-disc mechanism, rotation shelves dish, lock core, seesaw mechanism and pressing mechanism, wherein:
Described low bottom-disc mechanism comprises: the lower detent mechanism of the symmetrical and uniform setting of three group switching centres, detent mechanism comprises under every group: a password driver plate positioning cylinder, a seesaw positioning base, a first elastomeric element convex hole and two baffle plates, wherein: two baffle plates in each lower detent mechanism are arranged at respectively the both sides in corresponding first an elastomeric element convex hole and under two adjacent groups between the seesaw positioning base of detent mechanism, the seesaw positioning base of detent mechanism under three groups, a first elastomeric element convex hole and two baffle plates consist of triangular structure, and described password driver plate positioning cylinder is positioned at the triangular structure outside.
Described top bottom-disc mechanism comprises: the upper detent mechanism of the symmetrical and uniform setting of three group switching centres, detent mechanism comprises on every group: a protruding hole of driver plate positioning cylinder, two dark gear guide peg convex hole and rotary knob steric direction grooves that contain small magnet, wherein: rotary knob steric direction groove is corresponding with described the first elastomeric element convex hole site.
Further preferably be provided with five through holes in the described top bottom-disc mechanism, wherein: three through hole Central Symmetries are used for the location of pressing button, and two other through hole is used for fixed lock core.
Described seesaw mechanism comprises: the seesaw clamp mechanism of the symmetrical and uniform setting of three group switching centres, each seesaw clamp mechanism comprises: rotate and to be arranged at the password driver plate in the low bottom-disc mechanism and to lay respectively at its both sides and be meshed with it and be socketed on two dark gears and seesaw on the dark gear guide peg separately, wherein: the middle part of seesaw is rotated and is arranged in the low bottom-disc mechanism, the two ends of the seesaw of each seesaw clamp mechanism respectively with adjacent two seesaw clamp mechanisms in nearest two dark gear bottom connections touch.
Described password driver plate comprises: driver plate, groove and gear.
Described seesaw comprises: be positioned at the locating hole at middle part and two dark gear guide peg positioning cylinders that lay respectively at two ends, wherein: locating hole and described seesaw positioning base are complementary to realize the rotation setting of seesaw, and it is inner that dark gear guide peg positioning cylinder and described dark gear guide peg are complementary to be socketed on dark gear; When seesaw one end lifting, drive the dark gear lifting of one end points, the attraction that the dark gear guide peg of lifting is contained by top bottom-disc mechanism in the dark gear guide peg convex hole of small magnet is fixed, and at this moment, dark gear will hinder or discharge the rotation shelves and coil rotation.The dark gear of another end points descends.But dark gear is meshed with the password driving plate gear all the time.
Described pressing mechanism comprises: the button assembly of three group switching centres symmetry and uniform setting, every group of button assembly comprises: be flexibly set in pressing mechanism base in the low bottom-disc mechanism, with the pressing mechanism base successively coaxial rotary knob that is connected with press button, wherein:
Described pressing mechanism base comprises: the second elastomeric element convex hole and the boss that lays respectively at two ends, be positioned at a pair of guide strip in the outside, elastomeric element convex hole, be positioned at two overhanging cross locking arms in the boss outside and be positioned at two overhanging upper lock arms in the middle of the overhanging cross locking arm, wherein: the second elastomeric element convex hole links to each other by elastomeric element with the first elastomeric element convex hole in the low bottom-disc mechanism, the bottom of boss and described rotary knob is complementary, overhanging cross locking arm contacts with corresponding seesaw respectively, overhanging upper lock arm is used for the rotation of limit for cryptographic driving plate gear, matches with corresponding password driving plate gear.
Described rotary knob comprises: lay respectively at two ends shrinkage pool and protruding hole, be positioned at the guide strip of the rotary knob outside and uniform setting, wherein: shrinkage pool matches with base, protruding hole with press button and match.
When coded lock was in closure state, pressing mechanism was in impaction state, and namely the guide strip of rotary knob is in top bottom-disc mechanism steric direction trench bottom.At this moment, the overhanging upper lock arm of pressing mechanism base has hindered the rotation of password driver plate.When pressing button, under the effect of spring, the guide strip of rotary knob arrives top bottom-disc mechanism gathering sill head and fixing.At this moment, the lifting of pressing mechanism base, overhanging upper lock arm will no longer hinder the rotation of password driver plate, and overhanging cross locking arm drives an end lifting of corresponding seesaw.
Technique effect
Compared with prior art, the present invention has reformed the principle of coded lock, introduced the concept of double-deck password, and the logical order of the double-deck coding mechanism of ingenious utilization when having realized Password Input encoded, when not increasing the password figure place, greatly improved the safety of coded lock, even the numerical value of password is spied upon, the order of its password still can reach the effect of encryption.
Principle of the invention original creation, novel structure, easy to manufacture, small volume can be fit to the use of many conditions of family and factory.The Password Input mechanism of the principle of the double-deck cipher coding that the present invention proposes and adding logical order also provides new approaches and methods for the from now on improvement of coded lock in the security performance that has greatly improved lockset.
Description of drawings
Fig. 1 is light and shade Double-puzzle schematic diagram;
Fig. 2 is overall structure schematic diagram of the present invention;
Wherein: a, b and c are respectively the different angles schematic diagram.
Fig. 3 is the low bottom-disc structural scheme of mechanism;
Fig. 4 is the top bottom-disc structural scheme of mechanism;
Wherein: a, b are respectively the different views schematic diagram
Fig. 5 is password driver plate schematic diagram;
Fig. 6 is the seesaw schematic diagram;
Fig. 7 is dark gear guide peg schematic diagram;
The dark gear schematic diagram of Fig. 8;
Fig. 9 is the part assembly drawing of seesaw mechanism;
Wherein: a, b and c are respectively the different angles schematic diagram;
Figure 10 is pressing mechanism base schematic diagram;
Figure 11 is the rotary knob schematic diagram;
Figure 12 is for pressing the button schematic diagram;
Figure 13 is the pressing mechanism schematic diagram;
Wherein: a, b and c are respectively the different visual angles schematic diagram.
Figure 14 is rotation shelves dish schematic diagram;
Among the figure: 1 top bottom-disc mechanism, 2 low bottom-disc mechanisms, 3 rotation shelves dishes, 4 lock cores, 5 seesaw mechanisms, 6 pressing mechanisms, 7 times detent mechanisms, 8 password driver plate positioning cylinders, 9 seesaw positioning bases, 10 first elastomeric element convex holes, 11 baffle plates, detent mechanism on 12, the protruding hole of 13 driver plate positioning cylinders, 14 small magnets, 15 dark gear guide peg convex holes, 16 rotary knob steric direction grooves, 17 seesaw clamp mechanisms, 18 password driver plates, 19 dark gear guide pegs, 20 dark gears, 21 seesaws, 22 dark gear guide peg locating shafts, 23 grooves, 24 gears, 25 locating holes, 26 elastic bodys, 27 button assemblies, 28 pressing mechanism bases, 29 rotary knobs, 30 press button, 31 boss, 32 second elastomeric element convex holes, 33 pressing mechanism base guide plates, 34 overhanging cross locking arms, 35 overhanging upper lock arms, 36 shrinkage pools, 37 protruding holes, 38 guide strips, P working gear plane, T top bottom-disc mechanism gathering sill head, B top bottom-disc mechanism gathering sill bottom.
The specific embodiment
The below elaborates to embodiments of the invention, and the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, be the present embodiment principles illustrated, wherein: 3 bright passwords of first floor are the same with other coded lock to be the password that can see, is determined by combination disk, inputs password for the user.Second layer password is invisible 3 dark passwords, and the order during by the input password is determined.Each dark password is subjected to two adjacent bright cipher control, and its password value is the password value of rear input in two bright passwords that are attached thereto.For bright password, different input sequences will cause different dark passwords; For dark password, bright password of every input has been realized the assignment that refreshes of two dark passwords being attached thereto, the password value before namely covering.
Based on this mechanism, by double-deck password, the user is inputted the order of password and encode, input three password orders relative to it, export six passwords.Because the permutation and combination of three passwords altogether
Kind, so the combination one of three coded locks after the introducing logical order has 6 * 1000=6000 kind, and does not have repetition.
Suppose A, B, C, three bright passwords corresponding to password driver plate are 1,7,9.Then different input sequence of coden will be exported different light and shade password combination.
Wherein: A﹠amp; B is for being subjected to A, the dark password that B controls simultaneously.A﹠amp; C is for being subjected to A, the dark password that C controls simultaneously.B﹠amp; C is for being subjected to B, the dark password that C controls simultaneously.Input A, B, three bright passwords of C and its logical order, the combination of exporting six passwords after the coding.
Shown in Fig. 9 (a), described seesaw mechanism comprises: seesaw 21 is connected with two dark gear guide pegs 19, fix a dark gear 20 on each dark gear guide peg 19, dark gear 20 all is meshed with password driver plate 18 gears in any position, along with lifting of seesaw 21 1 ends, the dark gear 20 of its correspondence rises, dark also lifting of gear guide peg 19, the dark gear guide peg 19 of lifting is attracted by the small magnet in the dark gear guide peg convex hole 15 of top bottom-disc mechanism 1, and whole seesaw mechanism is fixed.At this moment, the dark gear 20 of lifting arrives working face P, the rotation of restricting rotation shelves dish 3.
Shown in Figure 13 (a), described pressing mechanism comprises: pressing mechanism base 28 and the rotary knob 29 steric direction groove 16 by top bottom-disc mechanism 1 with press button 30 and be assembled.
The cooperation of the guide strip by rotary knob 29 and the steric direction groove of top bottom-disc mechanism 1, guarantee that whole pressing mechanism only has two operating positions, the guide strip that is rotary knob 29 is positioned at top bottom-disc mechanism gathering sill 16 head T, perhaps 16 B at the bottom of the top bottom-disc mechanism gathering sill.By pressing button 30, under elastomeric effect, the guide strip of rotary knob 29 breaks away from the steric direction groove of top bottom-disc mechanism 1, it is rotated, the guide strip of rotary knob 29 changes the operating position under the effect of rotation, namely arrived the gathering sill bottom B of top bottom-disc mechanism or arrived the top bottom-disc gathering sill head T of mechanism by the gathering sill bottom B of top bottom-disc mechanism by the gathering sill head T of top bottom-disc mechanism.When the guide strip of rotary knob 29 was positioned at the gathering sill bottom B of top bottom-disc mechanism, the overhanging upper lock arm 35 of pressing mechanism base 28 was stuck in password driver plate 18 gears, has limited the rotation of gear.When the guide strip of rotary knob 29 was positioned at the gathering sill head T of top bottom-disc mechanism, the overhanging upper lock arm 35 of pressing mechanism base 28 was raised to the not position of limit for cryptographic driver plate 18 gears rotation.Two overhanging cross locking arms 34 of pressing mechanism base 28 also are raised to corresponding position at this moment.
Above-mentioned, seesaw mechanism 5 and pressing mechanism 6 and top bottom-disc mechanism 1, low bottom-disc mechanism 2, rotation shelves dish 3 and lock core form a light and shade dual coding mechanical lock jointly.Such as Fig. 2 (a), when unblanking, press button 30, the pressing mechanism lifting.The overhanging upper lock arm 35 of pressing mechanism base 28 leaves and hinders the position that password driver plate 18 rotates, and two overhanging cross locking arms 34 of pressing mechanism base drive seesaw 21 liftings of the seesaw mechanism of both sides.The lifting of seesaw mechanism is so that two corresponding dark gears 20 arrive working face P.At this moment, rotational password driver plate 18 input passwords, bright gear and two dark gears that are engaged with rotate.
Again press this and press button 30, so that pressing mechanism descends, the overhanging upper lock arm 35 of pressing mechanism base 28 pins password driver plate 18 again.Then press second and press button, input second password.Then input the 3rd password.
Have three dark passwords to be in working face this moment, and they are the same with three bright passwords, and groove part is in and discharges the position that rotation shelves dish 3 rotates.Rotate rotation shelves dish 3, can discharge lock core, open coded lock.At this moment, go back to rotation shelves dish 3, press button 30, discharge password driver plate 18, get final product the rotational password driver plate, password is dialled unrest.
Claims (9)
1. a light and shade dual coding mechanical lock is characterized in that, comprising: the cavity that is formed by top bottom-disc mechanism and low bottom-disc mechanism and rotation shelves dish, lock core, seesaw mechanism and the pressing mechanism that is positioned at cavity, wherein:
Described low bottom-disc mechanism comprises: the lower detent mechanism of the symmetrical and uniform setting of three group switching centres, detent mechanism comprises under every group: a password driver plate positioning cylinder, a seesaw positioning base, a first elastomeric element convex hole and two baffle plates, wherein: two baffle plates in each lower detent mechanism are arranged at respectively the both sides in corresponding first an elastomeric element convex hole and under two adjacent groups between the seesaw positioning base of detent mechanism, the seesaw positioning base of detent mechanism under three groups, a first elastomeric element convex hole and two baffle plates consist of triangular structure, and described password driver plate positioning cylinder is positioned at the triangular structure outside.
2. light and shade dual coding mechanical lock according to claim 1, it is characterized in that, described top bottom-disc mechanism comprises: the upper detent mechanism of the symmetrical and uniform setting of three group switching centres, detent mechanism comprises on every group: a protruding hole of driver plate positioning cylinder, two dark gear guide peg convex hole and rotary knob steric direction grooves that contain small magnet, wherein: rotary knob steric direction groove is corresponding with described the first elastomeric element convex hole site.
3. light and shade dual coding mechanical lock according to claim 1 is characterized in that, three through hole Central Symmetries are for the location of pressing button, and two other through hole is used for fixed lock core.
4. light and shade dual coding mechanical lock according to claim 1, it is characterized in that, described seesaw mechanism comprises: the seesaw clamp mechanism of the symmetrical and uniform setting of three group switching centres, each seesaw clamp mechanism comprises: rotate and to be arranged at the password driver plate in the low bottom-disc mechanism and to lay respectively at its both sides and be meshed with it and be socketed on two dark gears and seesaw on the dark gear guide peg separately, wherein: the middle part of seesaw is rotated and is arranged in the low bottom-disc mechanism, the two ends of the seesaw of each seesaw clamp mechanism respectively with adjacent two seesaw clamp mechanisms in nearest two dark gear bottom connections touch.
5. light and shade dual coding mechanical lock according to claim 1 is characterized in that, described password driver plate comprises: driver plate, groove and gear.
6. light and shade dual coding mechanical lock according to claim 1, it is characterized in that, described seesaw comprises: be positioned at the locating hole at middle part and two dark gear guide peg positioning cylinders that lay respectively at two ends, wherein: locating hole and described seesaw positioning base are complementary to realize the rotation setting of seesaw, and it is inner that dark gear guide peg positioning cylinder and described dark gear guide peg are complementary to be socketed on dark gear; When seesaw one end lifting, drive the dark gear lifting of one end points, the attraction that the dark gear guide peg of lifting is contained by top bottom-disc mechanism in the dark gear guide peg convex hole of small magnet is fixed, and at this moment, dark gear will hinder or discharge the rotation shelves and coil rotation.The dark gear of another end points descends.But dark gear is meshed with the password driving plate gear all the time.
7. light and shade dual coding mechanical lock according to claim 1, it is characterized in that, described pressing mechanism comprises: the button assembly of the symmetrical and uniform setting of three group switching centres, every group of button assembly comprises: be flexibly set in pressing mechanism base in the low bottom-disc mechanism, with the pressing mechanism base successively coaxial rotary knob that is connected with press button.
8. light and shade dual coding mechanical lock according to claim 1, it is characterized in that, described pressing mechanism base comprises: the second elastomeric element convex hole and the boss that lays respectively at two ends, be positioned at a pair of guide strip in the outside, elastomeric element convex hole, be positioned at two overhanging cross locking arms in the boss outside and be positioned at two overhanging upper lock arms in the middle of the overhanging cross locking arm, wherein: the second elastomeric element convex hole links to each other by elastomeric element with the first elastomeric element convex hole in the low bottom-disc mechanism, the bottom of boss and described rotary knob is complementary, overhanging cross locking arm contacts with corresponding seesaw respectively, overhanging upper lock arm is used for the rotation of limit for cryptographic driving plate gear, matches with corresponding password driving plate gear.
9. light and shade dual coding mechanical lock according to claim 1, it is characterized in that, described rotary knob comprises: lay respectively at two ends shrinkage pool and protruding hole, be positioned at the guide strip of the rotary knob outside and uniform setting, wherein: shrinkage pool matches with base, protruding hole with press button and match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310275032.8A CN103321488B (en) | 2013-07-03 | 2013-07-03 | Plain-secret dual-coded mechanical lock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310275032.8A CN103321488B (en) | 2013-07-03 | 2013-07-03 | Plain-secret dual-coded mechanical lock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103321488A true CN103321488A (en) | 2013-09-25 |
| CN103321488B CN103321488B (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310275032.8A Expired - Fee Related CN103321488B (en) | 2013-07-03 | 2013-07-03 | Plain-secret dual-coded mechanical lock |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110604697A (en) * | 2019-09-26 | 2019-12-24 | 中国人民解放军陆军军医大学第一附属医院 | Digestion feeding device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030205069A1 (en) * | 2002-05-06 | 2003-11-06 | Yehonatan Knoll | Combination lock |
| CN2878608Y (en) * | 2006-04-11 | 2007-03-14 | 李明 | Rotary mechanical puzzle lock |
| CN101029545A (en) * | 2007-04-17 | 2007-09-05 | 梁平县科达机械制造有限公司 | Lock master of two-purpose non-lockhole mechanical lock and key |
| CN102834575A (en) * | 2009-12-07 | 2012-12-19 | 总锁有限责任公司 | Mechanical pushbutton locking arrangements |
-
2013
- 2013-07-03 CN CN201310275032.8A patent/CN103321488B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030205069A1 (en) * | 2002-05-06 | 2003-11-06 | Yehonatan Knoll | Combination lock |
| CN2878608Y (en) * | 2006-04-11 | 2007-03-14 | 李明 | Rotary mechanical puzzle lock |
| CN101029545A (en) * | 2007-04-17 | 2007-09-05 | 梁平县科达机械制造有限公司 | Lock master of two-purpose non-lockhole mechanical lock and key |
| CN102834575A (en) * | 2009-12-07 | 2012-12-19 | 总锁有限责任公司 | Mechanical pushbutton locking arrangements |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110604697A (en) * | 2019-09-26 | 2019-12-24 | 中国人民解放军陆军军医大学第一附属医院 | Digestion feeding device |
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| CN103321488B (en) | 2015-04-01 |
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