CN113116171B

CN113116171B - Baking oven with liftable baking tray

Info

Publication number: CN113116171B
Application number: CN201911391852.7A
Authority: CN
Inventors: 王黎喆; 杨均; 曹骥
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2022-06-24
Anticipated expiration: 2039-12-30
Also published as: CN113116171A

Abstract

The invention relates to an oven with a liftable baking tray, which comprises an inner container, wherein movable side brackets are respectively arranged on the left inner side surface and the right inner side surface of the inner container, a driving device, a synchronous transmission mechanism and lifting mechanisms respectively corresponding to the movable side brackets are arranged on the outer side of the inner container, each lifting mechanism is respectively linked with the driving device through the synchronous transmission mechanism, each lifting mechanism is respectively connected with the corresponding movable side bracket through a connecting structure, vertical holes for the corresponding connecting structure to move up and down are respectively formed in the left side wall and the right side wall of the inner container, and protective covers are respectively covered at the corresponding positions of the vertical holes on the left outer side surface and the right outer side surface of the inner container. According to the invention, the vertical holes are sealed through the protective cover, so that the inner container can be sealed at the vertical holes, further, the heat in the inner container can be prevented from leaking out through each vertical hole in the baking process, the baking effect is further ensured, meanwhile, the oil stain in the inner container can be prevented from leaking out through the vertical holes in the baking process, and the use experience of a user is further improved.

Description

Baking oven with liftable baking tray

Technical Field

The invention relates to the field of cooking devices, in particular to a liftable oven with an oven body.

Background

The electric heating appliance for baking food by utilizing radiant heat emitted by an electric heating element in an oven is characterized in that a top heating pipe, a back heating pipe and a bottom heating pipe are arranged in a common oven liner, and the food is heated by the cooperation of the heating pipes. In the existing oven liner, because the installation positions of the heating pipes are fixed, the temperature distribution in the oven liner is not uniform, and the food can reach the optimal cooking effect at the optimal baking temperature. In the general baking process, a baking tray, a grill and the like are fixed at a certain position of the inner container, so that the position of the food material in the inner container is not changed in the baking process. Therefore, in the baking process, the food materials are heated unevenly, the best cooking effect cannot be achieved effectively, and the food materials with high requirements on the baking temperature are particularly suitable for the food materials.

In order to solve the above problem, chinese utility model patent that patent number is ZL201710584590.0 (publication number is CN10799761A) discloses a baking tray support elevating system of oven, with set up the left baking tray support and the hookup of right baking tray support that are used for supporting the baking tray in the oven inner bag left and right sides for drive left baking tray support and right baking tray support reciprocate in the oven inner bag, its characterized in that: the gear transmission mechanism comprises a driving motor, a first gear, a second gear, a first worm, a second worm, a left transmission shaft, a third gear, a first left conical tooth, a second left conical tooth, a left crank, a right transmission shaft, a fourth gear, a first right conical tooth, a second right conical tooth and a right crank. The elevating system who realizes through the slider-crank principle in this patent can make oven side support at the oven inner bag not co-altitude to the regulation to the overware height has been realized. However, because the driving device and the transmission mechanism for realizing the up-and-down lifting of the side support are arranged at the outer side of the inner container, the connection with the side support is realized by opening holes on the side wall of the inner container, so that the sealing problem of the inner container and the leakage problem of oil dirt during the baking process are inevitably caused, and the baking effect of the oven is further influenced.

Disclosure of Invention

The invention aims to solve the first technical problem of providing a baking tray liftable oven which has a good liner sealing property and can prevent oil stains from leaking.

The second technical problem to be solved by the invention is to provide a baking oven with a liftable baking tray, which is convenient to use, aiming at the prior art.

The technical scheme adopted by the invention for solving at least one technical problem is as follows: the utility model provides a overware liftable oven, including the inner bag, a serial communication port, be provided with movable side support on the medial surface about the inner bag respectively, the outside of inner bag is provided with drive arrangement, synchronous transmission mechanism and the elevating system who corresponds respectively with each movable side support, each elevating system links with drive arrangement through synchronous transmission mechanism respectively, and each elevating system is connected with the movable side support that corresponds through connection structure respectively, and set up the perpendicular hole that supplies the connection structure that corresponds to reciprocate on the lateral wall about the inner bag respectively, the corresponding department in each perpendicular hole covers respectively on the lateral surface about the inner bag is equipped with the safety cover, the corresponding department of above-mentioned connection structure and elevating system is located this safety cover respectively.

In order to facilitate the disassembly of each movable side bracket, each connecting structure comprises a first connecting block connected with the corresponding lifting mechanism and a second connecting block connected with the corresponding movable side bracket, the first connecting block is detachably connected with the second connecting block, the connecting device also comprises an upper sealing strip and a lower sealing strip, each sealing strip respectively extends vertically, the width of each sealing strip is matched with the width of the corresponding vertical hole, wherein the upper end of the upper sealing strip is provided with an upper tensioning device, the lower end of the upper sealing strip is connected with the upper end of the first connecting block, the lower end of the lower sealing strip is provided with a lower tensioning device, the upper end of the lower sealing strip is connected with the lower end of the first connecting block, under the action of the upper and lower tensioning devices, the inner side surfaces of the upper and lower sealing strips have the tendency of being pressed on the vertical hole, the upper end both ends of above-mentioned safety cover are seted up respectively and are supplied upper and lower via hole that upper and lower sealing strip passed, and the size of each via hole and the cross section size phase-match that corresponds the sealing strip. Can further promote the sealed to each perpendicular hole through the upper and lower sealing strip, thereby further promote the sealed effect to the inner bag, and then can further avoid toasting thermal loss in the in-process inner bag, further guarantee and toast the effect, and, the greasy dirt that toasts the in-process and produce can the enrichment on the medial surface of each sealing strip, during routine maintenance, the user only needs to dismantle mobile side support, it makes each sealing strip reciprocate along with first connecting block to open drive arrangement, the user contradicts the rag gently on the medial surface of each sealing strip, can shift the greasy dirt on each sealing strip to the rag along with the removal of first connecting block with each sealing strip.

Furthermore, the upper sealing strip and the lower sealing strip are both snap springs, the upper tensioning device and the lower tensioning device are both tensioning wheels, the upper end of the upper sealing strip is wound on the upper tensioning device, and the lower end of the lower sealing strip is wound on the lower tensioning device. The clamp spring is made of metal materials, the normal use of the clamp spring cannot be influenced even if grease adheres to the clamp spring for a long time, the sealing strips can move along the vertical hole more stably by the aid of the rotating winding of the tension wheel, the sealing effect of the sealing strips on the vertical hole is further improved, and a user can more conveniently clean grease on the sealing strips by the aid of the rotating of the tension wheel.

In order to enable the connecting structure and each sealing strip to move up and down along the corresponding vertical hole more stably, the sealing device further comprises guide frames respectively arranged on the left outer side surface and the right outer side surface of the inner container, each guide frame is matched with the corresponding vertical hole and covers the outer hole edge of the corresponding vertical hole, a first sealing ring is clamped between each guide frame and the outer hole edge of the corresponding vertical hole, each first connecting block is respectively positioned in the corresponding guide frame, the width of each first connecting block is matched with the width of the frame opening of the corresponding guide frame, each first connecting block can respectively slide up and down along the corresponding guide frame, the upper end and the lower end of each guide frame are respectively provided with an upper through hole and a lower through hole for the corresponding upper sealing strip and the corresponding lower sealing strip to penetrate through, and the upper sealing strip and the lower sealing strip are respectively connected in the guide frames and can respectively slide up and down relative to the guide frames through holes.

Furthermore, the inner side ends of the first connecting blocks extend inwards horizontally to form lock tongues, the outer side ends of the second connecting blocks are provided with lock holes for inserting the corresponding lock tongues, and the lock tongues are locked by vertically extending lock nails when being inserted into the corresponding lock holes. Thereby on the basis that first connecting block and second connecting block firm connection are realized, realize dismantling of both and connect betterly.

For convenience of customers uses, still be provided with fixed collateral branch frame on the medial surface about the inner bag respectively, the equal vertical draw hole of offering the connection structure that supplies to correspond reciprocates in the middle part of each fixed collateral branch frame. The user can select to use fixed side support to place the overware like this, perhaps uses activity side support to place the overware, for example when the food that treats to toast does not have high expectations to the temperature, in order to avoid the efficiency extravagant, can directly place the overware on fixed side support, when the food that treats to toast requires when higher to the temperature, can place the overware on activity side support to make the form of toasting more nimble.

Further, each fixed side support all is including setting up the support montant in front and back both sides, middle part interval between two support montants is provided with two slide bars, be connected with two at least pairs of horizontal pole pairs between each slide bar and the adjacent support montant respectively, each horizontal pole is to all including placing the horizontal pole and being located the spacing horizontal pole of placing the horizontal pole top, and two spacing horizontal poles that are located upper and lower both ends connect as an organic whole and form respectively and support the horizontal pole, above-mentioned slide bar encloses into above-mentioned slide opening with each supports between the horizontal pole, and the slide bar part that is located between each horizontal pole pair is respectively outside crooked and form the recess of stepping down that supplies overware male.

In order to enable each lifting mechanism to stably lift, each lifting mechanism comprises a lead screw and a guide frame which vertically extend, each lead screw vertically penetrates through a corresponding protective cover, each guide frame is arranged in a corresponding protective cover respectively, each guide frame comprises a fixed block and two guide rods, each lead screw penetrates through a rotating hole of the corresponding fixed block, the upper ends of the two guide rods are connected to two ends of the fixed block respectively and vertically extend, the lower ends of the guide rods at the two ends penetrate through corresponding first connecting blocks respectively, screw holes are formed in each first connecting block respectively, and are in threaded connection with the corresponding lead screws through the screw holes to form a rotating transmission pair, and the two corresponding guide rods can move up and down along the two corresponding guide rods.

In order to ensure that each lifting mechanism can lift up and down more stably and synchronously and further ensure that each side bracket can lift up and down stably and synchronously, the driving device is a driving motor, the transmission mechanism comprises a driving gear, a driven gear meshed with the driving gear, a synchronizing shaft, a left transmission shaft, a right transmission shaft, a left turbine and a right turbine, the driving gear is fixed on an output shaft of the driving motor, the driven gear is fixed on the synchronizing shaft, the synchronizing shaft is horizontally arranged along the left-right direction, both ends of the synchronizing shaft are respectively provided with the left turbine and the right turbine, the left transmission shaft and the right transmission shaft are respectively horizontally arranged along the front-back direction, the rear end of the left transmission shaft is fixed with a rear left turbine meshed with the left turbine, the front end of the left transmission shaft is fixed with a front left turbine, the rear end of the right transmission shaft is fixed with a right rear turbine meshed with the right turbine, and the front right turbine is fixed at the front end of the right transmission shaft, and the upper end of each screw rod is respectively fixed with a transmission turbine, and the front left turbine and the front right turbine are respectively meshed with the corresponding transmission turbines.

Compared with the prior art, the invention has the advantages that: in addition, the protective cover is arranged in the baking device, and the vertical holes are sealed through the protective cover, so that the inner container can be sealed at the vertical holes, the heat in the inner container can be prevented from leaking out through the vertical holes in the baking process, the baking effect is ensured, meanwhile, oil stains in the inner container can be prevented from leaking out through the vertical holes in the baking process, and the use experience of a user is improved.

Drawings

FIG. 1 shows an oven with a liftable baking tray according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 in another direction;

FIG. 3 is a schematic view of the structure of FIG. 1 in still another direction;

FIG. 4 is an exploded view of a part of the oven with a liftable baking tray in the embodiment of the present invention;

FIG. 5 is a schematic view of a partial structure of an oven with a liftable baking tray according to an embodiment of the present invention;

FIG. 6 is an exploded view of another part of the oven with a liftable baking tray according to the embodiment of the present invention;

FIG. 7 is a schematic structural view of a movable side stand according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a fixed side bracket according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 8, an oven with a liftable baking tray comprises an inner container 1, an upper mounting plate 11 is arranged above the inner container 1, and a bottom plate 12 is arranged below the inner container 1. Be provided with activity collateral branch frame 4 and fixed collateral branch frame 2 on the medial surface about above-mentioned inner bag 1 respectively, wherein activity collateral branch frame 4 can reciprocate, and when the overware was placed on the activity collateral branch frame 4 of both sides, through the reciprocating of activity collateral branch frame 4, it is more even to enable the food on the overware to be heated to obtain better stoving effect like this. The movable side support 4 and the fixed side support 2 are arranged at the same time, so that a user can select to use the fixed side support 2 to place a baking tray according to needs, or use the movable side support 4 to place the baking tray, for example, when the temperature requirement of food to be baked is not high, the baking tray can be directly placed on the fixed side support 2 to avoid energy efficiency waste, and when the temperature requirement of the food to be baked is high, the baking tray can be placed on the movable side support 4, so that the baking form is more flexible.

Further, for better realizing movable side support 4 and fixed side support 2 and installing in inner bag 1 simultaneously, the equal vertical sliding hole 20 that offers the connection structure 8 that corresponds and reciprocate of middle part of each fixed side support 2. Specifically, each of the fixed side supports 2 includes support vertical rods 21 disposed on the front and rear sides, two sliding rods 22 are disposed at intervals in the middle between the two support vertical rods 21, at least two pairs of transverse rods 23 are respectively connected between each sliding rod 22 and the adjacent support vertical rod 21, each transverse rod pair 23 includes a placement transverse rod 231 and a limit transverse rod 232 located above the placement transverse rod 231, the two limit transverse rods 232 located at the upper and lower ends are connected into a whole to respectively form a support transverse rod 24, the sliding holes 20 are defined between each sliding rod 22 and each support transverse rod 24, and the sliding rod 22 portions located between each transverse rod pair 23 are respectively bent outward to form abdicating grooves 25 for inserting baking trays. Each movable side bracket 4 in the invention is a long strip extending along the front-back direction of the inner container 1, and comprises a placing wall 41 extending horizontally and a limiting wall 42 extending vertically and upwards from the outer edge of the placing wall 41 along the length direction thereof.

Still further, in this embodiment, a driving device 5, a synchronous transmission mechanism 6 and lifting mechanisms 7 corresponding to the movable side supports 4 are disposed outside the inner container 1, each lifting mechanism 7 is linked with the driving device 5 through the synchronous transmission mechanism 6, each lifting mechanism 7 is connected with the corresponding movable side support 4 through a connecting structure 8, and vertical holes 10 for the corresponding connecting structure 8 to move up and down are disposed on the left and right side walls of the inner container 1. In the invention, the lifting mechanisms 7 are driven by the driving device 5 and the synchronous transmission mechanism 6 to synchronously lift up and down, and the lifting mechanisms 7 realize the synchronous lifting of the movable side brackets 4 at two sides through the connecting structure 8, thereby realizing the up-and-down lifting of baking trays placed on the movable side brackets 4 at two sides.

Specifically, the driving device 5 and the synchronous transmission mechanism 6 are both provided on the upper mounting plate 11, the driving device 5 is a driving motor, the synchronous transmission mechanism 6 includes a driving gear 61, a driven gear 62 engaged with the driving gear 61, a synchronizing shaft 63, a left transmission shaft 64, a right transmission shaft 65, a left turbine 631, and a right turbine 632, the driving gear 61 is fixed to an output shaft of the driving motor, the driven gear 62 is fixed to the synchronizing shaft 63, the synchronizing shaft 63 is horizontally provided in the left-right direction, both ends of the synchronizing shaft 63 are respectively provided with the left turbine 631 and the right turbine 632, the left and

right transmission shafts

64, 65 are respectively horizontally provided in the front-rear direction, a rear

left turbine

6,41 engaged with the left turbine 631 is fixed to a rear end of the left transmission shaft 64, a front left turbine 642 is fixed to a front end, a rear turbine 651 engaged with the right turbine 632 is fixed to a rear end of the right transmission shaft 65, a front right turbine 652 is fixed to the front end.

Furthermore, the right and left outer side surfaces of the inner container 1 are covered with the protective covers 3 at the corresponding positions of the vertical holes 10, and the connecting structures 8 and the corresponding positions of the lifting mechanisms 7 are located in the protective covers 3. Realize through safety cover 3 that the sealing to erecting hole 10 to can realize the sealing of inner bag 1 in erecting hole 10 department, and then can avoid toasting the heat in-process inner bag 1 and leak through respectively erecting hole 10, and then guarantee to toast the effect, also can avoid toasting the greasy dirt in-process inner bag 1 simultaneously and leak through erecting hole 10, and then promote user's use and experience.

In order to facilitate the detachment of each movable side bracket 4, each of the connecting structures 8 includes a first connecting block 81 connected to the corresponding lifting mechanism 7 and a second connecting block 82 connected to the corresponding movable side bracket 4, and the first connecting block 81 and the second connecting block 82 are detachably connected. In this embodiment, the inner end of each first connecting block 81 extends inward and horizontally to form a locking tongue 812, the outer end of each second connecting block 82 is formed with a locking hole 821 into which the corresponding locking tongue 812 is inserted, and each locking tongue 812 is locked by a locking nail 83 extending vertically when being inserted into the corresponding locking hole 821. Therefore, the first connecting block 81 and the second connecting block 82 can be detachably connected on the basis of realizing the stable connection of the two.

Further, the oven of the present invention further includes upper and

lower sealing strips

91, 92, each sealing strip vertically extends, and the width of each sealing strip matches with the width of the corresponding vertical hole 10, wherein the upper end of the upper sealing strip 91 is provided with an upward tensioning device 93, the lower end of the upper sealing strip is connected with the upper end of the first connecting block 81, the lower end of the lower sealing strip 92 is provided with a downward tensioning device 94, the upper end of the lower sealing strip is connected with the lower end of the first connecting block, under the action of the upper and

lower tensioning devices

93, 94, the inner side surfaces of the upper and

lower sealing strips

91, 92 have a tendency of pressing against the vertical hole 10, the two ends of the upper end of the protective cover 3 are respectively provided with through holes 31 for the upper and

lower sealing strips

91, 92 to pass through, and the size of each through hole 31 matches with the size of the cross section of the corresponding sealing strip. Through on, the

bottom sealing strip

91, 92 can further promote the sealed to each vertical hole 10, thereby further promote the sealed effect to inner bag 1, and then can further avoid toasting thermal loss in the in-process inner bag 1, further guarantee to toast the effect, and, the greasy dirt that toasts in-process production can the enrichment on the medial surface of each sealing strip, during routine maintenance, the user only needs to dismantle mobile side support 4, open drive arrangement 5 and make each sealing strip reciprocate along with first connecting block 81, the user will contradict the rag gently on the medial surface of each sealing strip, can shift the greasy dirt on each sealing strip to the rag along with the removal of first connecting block 81 along with each sealing strip. Preferably, the upper and

lower seal strips

91, 92 are snap springs, the upper and

lower tensioning devices

93, 94 are tensioning wheels, the upper end of the upper seal strip 91 is wound around the upper tensioning device 93, and the lower end of the lower seal strip 92 is wound around the lower tensioning device 94. The clamp spring is made of metal materials, the normal use of the clamp spring cannot be influenced even if the clamp spring is attached by grease for a long time, the sealing strips can move along the vertical hole 10 more stably through the rotating winding of the tension pulley, the sealing effect of the sealing strips on the vertical hole 10 is further improved, and a user can more conveniently clean oil stains on the sealing strips through the tensioning of the tension pulley. In this embodiment, the lower surface of the upper mounting plate 11 and the upper surface of the bottom plate 12 are respectively provided with a mounting seat 97 corresponding to each tensioning device, and each tensioning wheel is rotatably mounted on the corresponding mounting seat 97.

In this embodiment, in order to make the connecting structure 8 and each sealing strip move up and down along the corresponding vertical hole 10 more stably, the sealing device further comprises guide frames 95 respectively disposed on the left and right outer side surfaces of the inner container 1, each guide frame 95 is matched with the corresponding vertical hole 10 and covers the outer hole edge of the corresponding vertical hole 10, and a first sealing ring 96 is clamped between each guide frame 95 and the outer hole edge of the corresponding vertical hole 10, each first connecting block 81 is respectively positioned in the corresponding guide frame 95, the width of each first connecting block 81 is matched with the width of the frame opening of the corresponding guide frame 95, each first connecting block 81 can respectively slide up and down along the corresponding guide frame 95, the upper end and the lower end of each guide frame 95 are respectively provided with an upper through hole 951 and a lower through hole 952 through which the corresponding upper sealing strip 91 and the corresponding

lower sealing strip

92 and 92 penetrate, the upper sealing strip 91 and the lower sealing strip 92 penetrate in the guide frame 95 and can respectively slide up and down relative to the guide frame 95.

In addition, each of the lifting mechanisms 7 includes a lead screw 71 and a guide frame 72 extending vertically, each lead screw 71 vertically penetrates through the corresponding protective cover 3, each guide frame 72 is disposed in the corresponding protective cover 3, each guide frame 72 includes a fixed block 722 and two guide rods 721, each lead screw 71 penetrates through a rotating hole 7221 of the corresponding fixed block 722, the upper ends of the two guide rods 721 are connected to the two ends of the fixed block 722 respectively and extend vertically, the lower ends of the two guide rods 721 penetrate through the corresponding first connecting block 81 respectively, and each first connecting block 81 is provided with a screw hole 811 respectively and is in threaded connection with the corresponding lead screw 71 through the screw hole 811 to form a rotary transmission pair, and can move up and down along the corresponding two guide rods 721. The lifting mechanisms 7 are arranged to enable the lifting mechanisms 7 to lift up and down more stably, and further enable the movable side brackets 4 to lift up and down more stably. In addition, the upper end of each screw 71 passes through the upper mounting plate 11 and is fixed with a transmission worm gear 711, and the front left worm gear 631 and the front right worm gear 632 are respectively engaged with the corresponding transmission worm gears 711, so that the transmission of the lifting mechanism 7 can be well realized.

Claims

1. A baking oven with a liftable baking tray comprises an inner container (1) and is characterized in that movable side brackets (4) are respectively arranged on the left inner side and the right inner side of the inner container (1), a driving device (5), a synchronous transmission mechanism (6) and lifting mechanisms (7) respectively corresponding to the movable side brackets (4) are arranged on the outer side of the inner container (1), each lifting mechanism (7) is linked with the driving device (5) through the synchronous transmission mechanism (6), each lifting mechanism (7) is respectively connected with the corresponding movable side bracket (4) through a connecting structure (8), vertical holes (10) for the corresponding connecting structure (8) to move up and down are respectively formed in the left side wall and the right side wall of the inner container (1), protective covers (3) are respectively covered at the corresponding positions of the vertical holes (10) on the left outer side and the right outer side of the inner container (1), and the corresponding positions of the connecting structure (8) and the lifting mechanisms (7) are respectively located in the protective covers (3),

each connecting structure (8) comprises a first connecting block (81) connected with the corresponding lifting mechanism (7) and a second connecting block (82) connected with the corresponding movable side bracket (4), the first connecting block (81) and the second connecting block (82) are detachably connected,

still include, lower sealing strip (91, 92), the width of each sealing strip vertical extension respectively and each sealing strip all with the width phase-match that corresponds vertical hole (10), wherein, the upper end of upper sealing strip (91) is provided with tight device (93) that rises and the lower extreme is connected with the upper end of first connecting block (81), the lower extreme of lower sealing strip (92) is provided with tight device (94) that rises down and the upper end is connected with the lower extreme of first connecting block (81), on the aforesaid, under tight device (93, 94) effect that rises down, the above-mentioned upper and lower sealing strip (91, 92) medial surface has the trend of compressing tightly on vertical hole (10), the upper end both ends of above-mentioned safety cover (3) have been seted up respectively and have been supplied upper and lower sealing strip (91, 92) to pass, lower via hole (31, 32), and the size phase-match of the cross section size that corresponds the sealing strip of each via hole (31).

2. The oven as claimed in claim 1, wherein the upper and lower sealing strips (91, 92) are snap springs, the upper and lower tensioning devices (93, 94) are tensioning wheels, the upper end of the upper sealing strip (91) is wound around the upper tensioning device (93), and the lower end of the lower sealing strip (92) is wound around the lower tensioning device (94).

3. The oven with the baking tray capable of lifting and falling as claimed in claim 1 or 2, further comprising guide frames (95) respectively disposed on the left and right outer side surfaces of the inner container (1), each guide frame (95) is matched with the corresponding vertical hole (10) and covers the outer hole edge of the corresponding vertical hole (10), a first sealing ring (96) is interposed between each guide frame (95) and the outer hole edge of the corresponding vertical hole (10), each first connecting block (81) is respectively located in the corresponding guide frame (95) and the width of each first connecting block (81) is matched with the frame opening width of the corresponding guide frame (95), each first connecting block (81) can respectively slide up and down along the corresponding guide frame (95),

the upper end and the lower end of each guide frame (95) are respectively provided with an upper through hole (952) and a lower through hole (952), through which the corresponding upper sealing strip (91) and the corresponding lower sealing strip (92) penetrate, and the upper sealing strip and the lower sealing strip (92) penetrate into the guide frames (95) and can respectively penetrate through the upper through holes (951) and the lower through holes (952) to slide up and down relative to the guide frames (95).

4. The oven capable of lifting the baking tray as claimed in claim 1, wherein the inner end of each first connecting block (81) extends horizontally inwards to form a locking tongue (812), the outer end of each second connecting block (82) is provided with a locking hole (821) for the corresponding locking tongue (812) to insert into, and the locking tongues (812) are locked by vertically extending locking nails (83) when being inserted into the corresponding locking holes (821).

5. The baking tray liftable oven according to claim 1, 2 or 4, characterized in that the left and right inner side surfaces of the inner container (1) are respectively provided with a fixed side support (2), and the middle part of each fixed side support (2) is vertically provided with a slide hole (20) for the corresponding connecting structure (8) to move up and down.

6. The oven with liftable baking tray of claim 5, wherein each fixed side bracket (2) comprises a vertical supporting rod (21) arranged at the front side and the rear side, two sliding rods (22) are arranged at the middle part between the two vertical supporting rods (21) at intervals, at least two pairs of cross rod pairs (23) are respectively connected between each sliding rod (22) and the adjacent vertical supporting rod (21), each cross rod pair (23) comprises a placing cross rod (231) and a limiting cross rod (232) positioned above the placing cross rod (231), and two limit cross bars (232) positioned at the upper end and the lower end are connected into a whole to respectively form a support cross bar (24), the sliding holes (20) are enclosed between the sliding rods (22) and the supporting cross bars (24), and the sliding rod (22) between each cross rod pair (23) is partially bent outwards to form a yielding groove (25) for inserting the baking tray.

7. The oven with liftable baking tray of claim 5, wherein each lifting mechanism (7) comprises a vertically extending screw rod (71) and a guide frame (72), each screw rod (71) vertically penetrates through the corresponding protective cover (3), each guide frame (72) is respectively arranged in the corresponding protective cover (3), each guide frame (72) comprises a fixed block (722) and two guide rods (721), each screw rod (71) penetrates through the rotating hole (7221) of the corresponding fixed block (722), the upper ends of the two guide rods (721) are respectively connected with the two ends of the fixed block (722) and vertically extend, the lower ends of the two guide rods (721) are respectively penetrated through the corresponding first connecting block (81), each first connecting block (81) is respectively provided with a screw hole (811) and is in threaded connection with the corresponding screw rod (71) through the screw hole (811) to form a rotating transmission pair, and can move up and down along the corresponding two guide rods (721).

8. The oven as claimed in claim 7, wherein the driving device (5) is a driving motor, the synchronous transmission mechanism (6) comprises a driving gear (61), a driven gear (62) engaged with the driving gear (61), a synchronizing shaft (63), a left transmission shaft (64), a right transmission shaft (65), a left turbine (631) and a right turbine (632), the driving gear (61) is fixed on an output shaft of the driving motor, the driven gear (62) is fixed on the synchronizing shaft (63), the synchronizing shaft (63) is horizontally arranged along the left-right direction, two ends of the synchronizing shaft (63) are respectively provided with the left turbine (631) and the right turbine (632), the left transmission shaft (64) and the right transmission shaft (65) are respectively horizontally arranged along the front-back direction, and the rear end of the left transmission shaft (64) is fixed with a rear left turbine (641) engaged with the left turbine (631), a front left turbine (642) is fixed at the front end, a right rear turbine (651) meshed with the right turbine (632) is fixed at the rear end of the right transmission shaft (65), a front right turbine (652) is fixed at the front end, a transmission turbine (711) is fixed at the upper end of each screw rod (71), and the front left turbine (642) and the front right turbine (652) are respectively meshed with the corresponding transmission turbines (711).