CN114150979B

CN114150979B - Door structure for warehouse

Info

Publication number: CN114150979B
Application number: CN202111236427.8A
Authority: CN
Inventors: 林峰
Original assignee: Taizhou Zhongsui Technology Co ltd
Current assignee: Taizhou Zhongsui Technology Co ltd
Priority date: 2021-10-23
Filing date: 2021-10-23
Publication date: 2023-06-27
Anticipated expiration: 2041-10-23
Also published as: CN114150979A

Abstract

The utility model relates to a door structure for storage relates to granary equipment technical field, including the portal, articulate in the interior door of both sides in the portal, articulate in the outer door of both sides in the portal, offered the discharge gate on the interior door, slide along vertical direction in the interior door and have the closure plate with the discharge gate shutoff, interior door extends and mutual butt towards the direction of keeping away from outer door, interior door is located the inside setting of court of portal. The utility model provides a through setting up discharge gate and closure plate, the size of the high regulation discharge gate of utilizing the closure plate to slide on, and then adjust the flow that grain flows out in from the granary to have the advantage of the grain volume of getting out in the granary of being convenient for control.

Description

Door structure for warehouse

Technical Field

The application relates to the technical field of granary equipment, in particular to a door structure for storage.

Background

At present, grain bins are generally adopted on grain storage equipment so as to store grains, prevent external water vapor and insect ants from entering the grain bins, and install bin gates on the grain bins so as to take out grains in time.

Related art is like the open door dismantlement structure in granary of publication No. CN212478944U, including two at least door plant, wherein at least one door plant is the door plant of opening, and other door plant are the cooperation door plant, are equipped with the butt position of mutually supporting between the adjacent door plant and are used for sealedly, and all door plant all demountable installation is on same slide, the slide includes slide and glide slope, and the opening of slide is relative with the opening of glide slope, the bottom of intermediate door is placed on the lower bottom of glide slope, and the top of intermediate door is settled in last slide and has the interval with the upper bottom of last slide.

For the above related art, the inventors consider that: when the grain is required to be discharged, the opening door is required to be opened, then the middle door plate is required to be opened, at the moment of opening, as more grains are in the granary, the middle door plate is required to be fully opened, the grain rushing out from the middle door is faster, the flow is larger, and the control of the rushing out grain amount is more difficult.

Disclosure of Invention

In order to be convenient for control grain in the granary take-out volume, the purpose of this application is to provide a door structure for storage.

The application provides a door structure for warehouse adopts following technical scheme:

the utility model provides a door structure for storage, includes the portal, articulate in the interior door of both sides in the portal, articulate in the outer door of both sides in the portal, the discharge gate has been seted up on the interior door, slide along vertical direction in the interior door have will the closure plate of discharge gate shutoff, interior door is kept away from the direction of outer door extends and mutual butt, interior door is located towards the inside setting of granary in the portal.

Through adopting above-mentioned technical scheme, when putting into the granary with grain, interior door is with granary mouth shutoff to outside the outer door orientation granary, make interior door slope and mutual butt in orientation granary, in order that the inside grain extrusion interior door of granary makes the interior door close under the extrusion of grain tighter. When the flow of grains flowing out of the discharge hole needs to be controlled, the blocking plate slides upwards along the vertical direction so as to open the discharge hole for discharging grains. And the size of the discharge hole is adjusted along with the sliding height of the blocking plate, so that the flow of grains flowing out of the granary is adjusted, and the grain taking-out amount in the granary is conveniently controlled.

Optionally, the inner door comprises an upper door hinged at the upper end of the door frame and a lower door hinged at the lower end of the door frame, and the discharge port is positioned at the upper door.

Through adopting above-mentioned technical scheme, when the grain height in the granary is less than the discharge gate, rotate the upper door towards the direction of keeping away from outer door to open the upper door and look over the grain surplus in the granary. Then, after the lower door rotates towards the interior of the granary, the unilateral lower door rotates towards the direction close to the outer door, so that the two lower doors are staggered, and the lower door is opened, thereby being convenient for taking out less grains in the granary.

Optionally, the lower door includes articulated section, articulated in the articulated section of two relative inner walls on the portal keep away from the butt section of portal one end, butt section towards the direction of keeping away from outer door butt each other and restriction articulated section and butt section are towards outer door rotation.

Through adopting above-mentioned technical scheme, when opening lower door, will hinge section and butt section together rotate in the granary earlier for after the butt section breaks away from each other, rotate the butt section towards the direction that is close to outer door, with the space between two hinge sections of increase, and be convenient for open hinge section, the butt section of both sides in the portal. Therefore, the abutting section and the hinging section are arranged in a hinging manner, the angle required to rotate when the lower door is opened is shortened by utilizing the hinging of the abutting section, and the distance between the hinging sections is increased by the rotation of the abutting section, so that a worker can push the abutting section towards the granary and open the door after rotating towards the outer door.

Optionally, the butt section is towards one side of outer door articulates and is provided with the push rod, the push rod is kept away from the one end rotation of butt section is connected with the snap ring, outer door orientation one side of butt section is equipped with the pothook that links to each other with the snap ring, the push rod is used for receiving the promotion of outer door and drives butt section and articulated section and rotate towards the direction of keeping away from outer door.

Through adopting above-mentioned technical scheme, when pushing the butt section with articulated section towards the granary in, open outer door, then rotate the push rod towards outer door to make snap ring and pothook hook mutually. At this time, the outer door is in an open state outside the door frame, and then the outer door is pushed towards the granary so as to drive the hinge section to rotate towards the granary through the abutting section abutted by the push rod, so that the abutting sections are staggered, and the hinge section is opened after the abutting section rotates towards the outer door. Therefore, through setting up the push rod, utilize the hook connection of snap ring, pothook for the butt section is connected with outer door, makes the staff promote outer door casing and drives the butt section and rotate, staggers each other after being convenient for promote the butt section to push against the grain in the granary, thereby saves the required manpower of promotion butt section.

Optionally, rotate on the butt section and be connected with the spliced pole, the one end that the outer door was kept away from to the push rod articulate in on the spliced pole, fixedly connected with butt pole on the spliced pole lateral wall, when pothook and snap ring hook mutually, butt pole is located the articulated department of butt section and articulated section.

Through adopting above-mentioned technical scheme, when pushing the butt section towards the granary in, rotate the push rod, drive the pivoted post and rotate, and then drive the butt pole and rotate for the butt pole rotates to the level and is located the articulated department of butt section and articulated section. At this time, the clamping ring on the push rod is in a vertical state and is convenient to be hooked with the clamping hook. Then the outer door is pushed towards the interior of the granary, so that the push rod acts on the abutting rod to drive the abutting section and the hinging section to synchronously rotate towards the interior of the granary, the angle required by mutual staggering of the abutting section is further reduced, and the hinging section and the abutting section are conveniently driven to synchronously rotate.

Optionally, the upper door is rotatably connected with a latch hook, and the latch hook is used for being hooked with a snap ring on the push rod which is rotated to a vertical state.

Through adopting above-mentioned technical scheme, when needs are opened the internal door entirely, rotate push rod round with the articulated axis of pivoted post for after pothook and snap ring hook link release. Then, the push rod is rotated to drive the rotating column to rotate, the abutting rod is driven to rotate away from the hinging position of the abutting section and the hinging section until the abutting rod rotates to a vertical state, and at the moment, the clamping ring rotates to a horizontal state along with the push rod, and the abutting rod is simultaneously abutted against the upper door and the abutting section. Then the push rod is rotated towards the upper door until the clamping ring is rotated to the lower side of the locking hook, and then the locking hook is rotated to enable the locking hook to be hooked with the clamping ring, so that the upper door is connected with the abutting section through the push rod, and the upper door and the abutting section can be driven to synchronously rotate by pulling and pushing under the abutting of the abutting rod, and the inner door can be opened at one time conveniently.

Optionally, the latch hook coaxial coupling has the pivot, the pivot rotate connect in the upper door, the pivot is located the one end cover outside the upper door is equipped with the knob, be equipped with the locking piece that locks the closure plate that will slide in the upper door, be equipped with the driving medium that control locking piece locked on the knob.

Through adopting above-mentioned technical scheme, when locking the closure plate after the slip, rotate the knob, the knob passes through driving medium control locking piece and starts to lock the closure plate after the slip, with the closure plate after the slip in with the discharge gate locks, make the slip of closure plate fixable, so that the staff slides the closure plate after fixing, need not staff or extra instrument and fixes the closure plate, thereby be convenient for be fixed in the discharge gate with the closure plate.

Optionally, the locking piece includes locking lever and the slide bar that slides in the upper door, the slip direction of locking lever is mutually perpendicular with the closure plate, the slip direction of slide bar with the locking lever is mutually perpendicular, the inclined guide surface has been seted up to the one end that the closure plate was kept away from to the locking lever, the slide bar gliding acts on the guide surface and drives locking lever slip discharge gate and closure plate lateral wall looks butt, the upper end of slide bar is located one side of pivot.

Through adopting above-mentioned technical scheme, when locking the closure plate that will slide in the discharge gate, rotate the knob, the knob drives driving piece transmission slide bar gliding for the slide bar butt is supported behind the guide surface and is moved the locking lever towards the discharge gate internal slip, with the locking lever support tightly in the lateral wall of closure plate, locks the closure plate in the discharge gate, thereby is convenient for support tightly the closure plate in the discharge gate.

Optionally, the driving medium includes the cover locate on the pivot and with knob coaxial coupling's gear, set up in on the slide bar with gear engaged with rack, knob threaded connection in the upper door, when the knob was screwed up in the upper door, the slide bar downslide is supported and is moved locking lever and closure plate lateral wall and is supported tightly.

Through adopting above-mentioned technical scheme, when locking the slide that slides, rotatory knob drives the gear and rotates, and the gear drives rack and slide bar gliding again, and the butt is on the guide surface after the slide bar gliding for the locking lever slides in the feed inlet, until the locking lever supports tightly in the lateral wall of closure plate, in order to lock the closure plate after the slip in the discharge gate, and make the knob screw up in upper door lateral wall. When the locking of the blocking plate is required to be released, the knob is reversely rotated to drive the gear to reversely rotate, so that the rack and the slide rod slide upwards, the locking rod is separated from the butt joint of the slide rod, and then the blocking plate slides downwards by gravity to extrude the butt joint of the locking rod and the slide rod, so that the blocking plate can block the discharge hole, and the blocking plate can be locked and unlocked conveniently.

In summary, the present application includes at least one of the following beneficial technical effects:

the size of the discharge hole is adjusted by the aid of the sliding height of the blocking plate through the discharge hole and the blocking plate, so that the flow of grains flowing out of the grain bin is adjusted, and the grain taking out of the grain bin is conveniently controlled;

the abutting sections and the hinging sections are arranged in a hinging manner, the angle required to rotate when the lower door is opened is shortened by utilizing the hinging of the abutting sections, and the distance between the hinging sections is increased by the rotation of the abutting sections, so that a worker can push the abutting sections to the granary and open the granary after rotating the abutting sections to the outer door;

the push rod is arranged, and the abutting section is connected with the outer door by utilizing the hooking of the clamping ring and the clamping hook, so that a worker pushes the outer door shell to drive the abutting section to rotate, so that grains in the grain bin are pushed by the abutting section to be mutually staggered, and the labor force required for pushing the abutting section is saved;

by arranging the rotating column and the abutting rod, the abutting section and the hinging section are driven to synchronously rotate towards the grain bin after the pushing rod acts on the abutting rod, so that the angle of rotation required by mutual staggering of the abutting section is further reduced, and the hinging section and the abutting section are conveniently driven to synchronously rotate;

through setting up knob, locking lever, gear, utilize the rotation of knob to drive gear rotation, the gear drives rack, slide bar slip, and the slide bar slip drives the locking lever and supports the closure plate that slides tightly to the staff slides closure plate postfix, need not staff or extra instrument and fixes the closure plate, thereby is convenient for be fixed in the discharge gate with the closure plate.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present application.

Fig. 2 is an exploded view of an embodiment of the present application for illustrating a push rod.

Fig. 3 is an exploded schematic view of an embodiment of the present application for showing a locking member and a driving member.

Reference numerals illustrate: 1. a door frame; 2. an inner door; 21. an upper door; 211. a discharge port; 212. a closure plate; 213. a cross plate; 22. a lower door; 221. a hinge section; 222. an abutment section; 23. rotating the column; 231. a butt joint rod; 24. a push rod; 241. a clasp; 25. a rotating shaft; 251. a latch hook; 26. a knob; 27. a gear; 271. a rack; 28. a slide bar; 29. a locking lever; 291. a guide surface; 3. an outer door; 31. and (5) clamping hooks.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-3.

The embodiment of the application discloses a door structure for storage.

Referring to fig. 1, the door structure comprises a door frame 1 fixed with a granary, wherein two sides of the inside of the door frame 1 are hinged with an inner door 2 close to the granary, meanwhile, two sides of the inside of the door frame 1 are also hinged with an outer door 3 far away from the granary, the inner door 2 plugs the outlet of the granary, and the outer door 3 plugs the inner door 2 in the door frame 1.

Referring to fig. 1, the inner door 2 extends in a direction away from the outer door 3 and is inclined, and one ends of the inner door 2 away from the outer door 3 are abutted against each other, so that the inner door 2 forms a triangle protruding from the door frame 1, so that the pressure of grains in the granary is impacted on the inner door 2, and the inner door 2 in the triangle is abutted more tightly, so that the inner door 2 is closed more tightly.

Referring to fig. 1 and 2, the inner door 2 includes an upper door 21 hinged to an upper end of the door frame 1, and a lower door 22 hinged to a lower end of the door frame 1, the upper door 21 having a larger volume than the lower door 22. The upper door 21 is provided with a discharge hole 211, a blocking plate 212 slides in the upper door 21 along the vertical direction, the blocking plate 212 slides in the discharge hole 211 to block the discharge hole 211, the lower end of the blocking plate 212 is fixedly connected with a transverse plate 213, the transverse plate 213 is positioned on one side of the blocking plate 212 facing the outer door 3, so that a worker can lift the transverse plate 213 to drive the blocking plate 212 to slide, and the size of the discharge hole 211 is adjusted.

Referring to fig. 2, the lower door 22 includes a hinge section 221 hinged to both sides inside the door frame 1, an abutment section 222 hinged to an end of the hinge section 221 remote from the door frame 1, and hinge axes of the hinge section 221 and the abutment section 222 each extend in a vertical direction. The end of the abutting section 222 away from the hinge section 221 is inclined so that the inclined surfaces of the abutting section 222 abut against each other to form the lower door 22 protruding outwards of the door frame 1, so that the lower door 22 is triangular, and the abutting section 222 and the hinge section 221 are limited to rotate towards the outer door 3.

Referring to fig. 2, a rotation post 23 is rotatably connected to one side of the abutment section 222 facing the outer door 3, and an abutment rod 231 is fixedly connected to a side wall of the rotation post 23, and a rotation axis of the rotation post 23 is perpendicular to a hinge axis of the abutment section 222. The end of the abutting rod 231 far away from the rotating post 23 extends to one side of the hinged section 221, so that the abutting rod 231 can be in sliding abutting contact with the side wall of the abutting section 222 and can also be in sliding abutting contact with the side wall of the hinged section 221, and the abutting rod 231 can be in abutting contact with the abutting section 222 and the side wall of the upper door 21 when rotating to the vertical state.

Referring to fig. 2, a push rod 24 is hinged to an end of the rotating post 23 away from the abutting rod 231, and a snap ring 241 is rotatably connected to an end of the push rod 24 away from the rotating post 23. When the abutting rod 231 abuts against the abutting section 222 and the hinge section 221 at the same time, the hinge axes of the push rod 24 and the rotation column 23 extend in the vertical direction, so that the annular hole in the middle of the snap ring 241 penetrates in the horizontal direction. When the abutting rod 231 abuts against the upper door 21 and the abutting section 222 at the same time, the hinge axes of the push rod 24 and the rotation column 23 extend in the horizontal direction, and the snap ring 241 is rotated so that the annular hole in the middle of the snap ring 241 penetrates in the vertical direction.

Referring to fig. 1 and 2, a hook 31 hooked with a clasp 241 is rotatably connected to a sidewall of the outer door 3 facing the abutment section 222, so that after the outer door 3 is opened, the clasp 241 and the hook 31 on the push rod 24 are hooked, so that the outer door 3 is connected to the abutment section 222 through the push rod 24, and the outer door 3 is in a state of being opened outside the door frame 1. So as to push the outer door 3 inwards, and the push rod 24 drives the abutting section 222 and the hinge section 221 to rotate together in a direction away from the outer door 3 until the abutting sections 222 on two sides in the door frame 1 are staggered with each other. Then, the hooking between the clamping ring 241 and the clamping hook 31 is released, the push rod 24 is rotated to drive the abutting rod 231 to rotate to a vertical state, and then the abutting sections 222 are rotated towards the direction of the outer door 3, so that the distance between the abutting sections 222 at two sides in the door frame 1 is increased, the abutting sections 222 are conveniently rotated into the door frame 1, the lower door 22 is conveniently opened, and a small amount of grains in the granary can be taken out from the gap between the opened abutting sections 222.

Referring to fig. 3, a rotating shaft 25 is rotatably connected to the upper door 21, one end of the rotating shaft 25 penetrates through the inner door 2 and is fixedly connected with a latch hook 251, the latch hook 251 is located above a push rod 24 which rotates to a vertical state, a snap ring 241 on the push rod 24 which rotates to the vertical state can be hooked with the latch hook 251, and a supporting rod 231 at the moment is simultaneously abutted to the upper door 21 and the abutting section 222 so as to facilitate pulling the push rod 24, and the upper door 21, the abutting section 222 and the hinging section 221 can be simultaneously driven to rotate together, so that the upper door 21, the abutting section 222 and the hinging section 221 can be conveniently opened simultaneously.

Referring to fig. 3, one end of the rotating shaft 25 away from the latch hook 251 is rotatably connected to the upper door 21, one end of the rotating shaft 25 located outside the upper door 21 is sleeved with a knob 26, the rotating shaft 25 is rotated in the knob 26, and the knob 26 is in threaded connection with the upper door 21. A locking member for locking the sliding closure plate 212 is installed in the upper door 21, so that the height of the closure plate 212 at each position in the discharge port 211 is locked. The knob 26 is provided with a transmission member for controlling the locking member to lock, so that the rotation of the knob 26 drives the transmission member to act, and the locking member locks the blocking plate 212.

Referring to fig. 3, the locking member includes a locking lever 29 sliding in the upper door 21 in the horizontal direction and a slide bar 28 sliding in the vertical direction in the upper door 21, one end of the locking lever 29 away from the slide bar 28 slides into the discharge port 211 and abuts against the side wall of the closure plate 212, one end of the locking lever 29 close to the slide bar 28 is an inclined guide surface 291, and the guide surface 291 is located at the lower end of the slide bar 28 and abuts against the lower end of the slide bar 28. The sliding rod 28 slides down and then abuts against the guide surface 291 so as to abut against the locking rod 29 to slide in a direction away from the sliding rod 28 until the locking rod 29 slides into the discharge hole 211 and abuts against the side wall of the closure plate 212 so as to lock the closure plate 212 in the discharge hole 211.

Referring to fig. 3, the upper end of the slide bar 28 extends to one side of the rotation shaft 25, and the driving member includes a gear 27 coaxially coupled to the knob 26 and a rack 271 fixedly coupled to a side wall of the slide bar 28 and engaged with the gear 27. The rotating shaft 25 rotates in the gear 27 to be screwed on the side wall of the upper door 21 through the knob 26, so as to drive the gear 27 to rotate, further drive the rack 271 and the slide bar 28 to slide downwards, and abut against the locking rod 29 to tightly abut against the side wall of the closure plate 212. After the knob 26 is unscrewed, the gear 27 drives the rack 271 and the slide bar 28 to slide upwards, so that the slide bar 28 is separated from the contact with the locking bar 29, the blocking plate 212 slides downwards under the gravity to block the discharge hole 211, and the locking bar 29 is extruded to slide away from the discharge hole 211.

The implementation principle of the door structure for storage in the embodiment of the application is as follows: when grains in the granary are placed, the lifting transverse plate 213 drives the blocking plate 212 to slide upwards to expose the discharge hole 211, then the knob 26 is screwed down, so that the sliding rod 28 slides downwards to prop the locking rod 29 into the discharge hole 211, and the locking rod 29 props against the side wall of the blocking plate 212 to lock the blocking plate 212. Until the grain corresponding to the height of the upper door 21 is placed, the push rod 24 is rotated toward the outer door 3, and the abutting rod 231 is rotated to the hinge of the abutting section 222 and the hinge section 221. Then link up snap ring 241 and pothook 31 mutually, promote outer door 3 towards the granary in to drive butt section 222 through push rod 24 and rotate towards the granary in, make each other break away from behind the butt section 222 extrusion grain, then rotate unilateral butt section 222 towards outer door 3, with the distance between the butt section 222 of increase portal 1 both sides, open lower door 22, be convenient for take out a small amount of grain of granary inner bottom. The flow of grain flowing out of the grain bin is regulated through the sliding of the blocking plate 212 and the opening of the upper door 21 and the lower door 22, so that the grain taking out of the grain bin is conveniently controlled.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. A door structure for storage, its characterized in that: the automatic grain bin discharging device comprises a door frame (1), inner doors (2) hinged to the inner sides of the door frame (1) and outer doors (3) hinged to the inner sides of the door frame (1), wherein a discharging hole (211) is formed in the inner doors (2), a blocking plate (212) for blocking the discharging hole (211) is slipped in the inner doors (2) along the vertical direction, the inner doors (2) extend towards the direction away from the outer doors (3) and are mutually abutted, and the inner doors (2) are arranged in the door frame (1) towards the interior of the grain bin;

the inner door (2) comprises an upper door (21) hinged to the upper end of the door frame (1) and a lower door (22) hinged to the lower end of the door frame (1), and the discharge port (211) is positioned on the upper door (21);

the lower door (22) comprises hinge sections (221) hinged on two opposite inner walls of the door frame (1), and an abutting section (222) hinged on one end, far away from the door frame (1), of the hinge sections (221), wherein the abutting sections (222) mutually abut against each other in a direction far away from the outer door (3) and limit the hinge sections (221) and the abutting sections (222) to rotate towards the outer door (3);

one side of the abutting section (222) facing the outer door (3) is hinged with a push rod (24), one end, far away from the abutting section (222), of the push rod (24) is rotationally connected with a clamping ring (241), one side, facing the abutting section (222), of the outer door (3) is provided with a clamping hook (31) hooked with the clamping ring (241), and the push rod (24) is used for being pushed by the outer door (3) to drive the abutting section (222) and the hinging section (221) to rotate in a direction far away from the outer door (3);

the abutting section (222) is rotatably connected with a rotating column (23), one end, far away from the outer door (3), of the push rod (24) is hinged to the rotating column (23), the side wall of the rotating column (23) is fixedly connected with an abutting rod (231), and when the clamping hook (31) is hooked with the clamping ring (241), the abutting rod (231) is located at the hinge position of the abutting section (222) and the hinge section (221);

the upper door (21) is rotatably connected with a lock hook (251), and the lock hook (251) is used for being hooked with a clamping ring (241) on a push rod (24) which is rotated to a vertical state;

the lock hook (251) is coaxially connected with a rotating shaft (25), the rotating shaft (25) is rotationally connected in the upper door (21), one end of the rotating shaft (25) positioned outside the upper door (21) is sleeved with a knob (26), a locking piece for locking a sliding blocking plate (212) is arranged in the upper door (21), and a transmission piece for controlling the locking piece to lock is arranged on the knob (26).

2. A warehouse door structure as claimed in claim 1, wherein: the locking piece comprises a locking rod (29) and a sliding rod (28) which slide in an upper door (21), the sliding direction of the locking rod (29) is perpendicular to a blocking plate (212), the sliding direction of the sliding rod (28) is perpendicular to the locking rod (29), an inclined guide surface (291) is arranged at one end, far away from the blocking plate (212), of the locking rod (29), the sliding rod (28) slides downwards to act on the guide surface (291) to drive the locking rod (29) to slide into a discharge hole (211) and the side wall of the blocking plate (212) to abut, and the upper end of the sliding rod (28) is located at one side of the rotating shaft (25).

3. A warehouse door structure as claimed in claim 2, wherein: the transmission piece comprises a gear (27) which is sleeved on the rotating shaft (25) and is coaxially connected with the knob (26), and a rack (271) which is arranged on the sliding rod (28) and is meshed with the gear (27), the knob (26) is in threaded connection with the upper door (21), and when the knob (26) is screwed on the upper door (21), the sliding rod (28) slides downwards to abut against the side wall of the locking rod (29) and the side wall of the blocking plate (212) to abut against.