CN217262318U

CN217262318U - Rear door locking structure of sanitation vehicle

Info

Publication number: CN217262318U
Application number: CN202220184268.5U
Authority: CN
Inventors: 彭稳; 邱东升; 徐浩
Original assignee: Shanghai Xire Energy Automobile Co ltd
Current assignee: Shanghai Xire Energy Automobile Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-08-23
Anticipated expiration: 2032-01-24

Abstract

The utility model provides a rear door locking structure of a sanitation vehicle, which comprises a dustbin, a rear door, a lock device and a gas spring, wherein the lock device comprises a pushing mechanism and a latch hook mechanism, the outer side of a door plate is provided with a latch hook rotating point, and the latch hook mechanism is rotatably arranged on the latch hook rotating point; the outer side of the door plate is also provided with an upper rotating point which is positioned above the rotating point of the lock hook, the lock hook mechanism is provided with a lower rotating point, and the gas spring is rotatably arranged on the upper rotating point and the lower rotating point. The air spring provides a pulling force to be overcome in the locking and rotating process of the locking hook mechanism, so that the locking hook mechanism is prevented from rotating too early and cannot rotate and be locked at a locking position in the process of overcoming the compression bounce of the sealing strip by the rear door, and the locking hook mechanism is prevented from being automatically disengaged due to failure of the hydraulic cylinder and the like, and the reliability is effectively improved.

Description

Rear door locking structure of sanitation vehicle

Technical Field

The utility model relates to an engineering vehicle field especially relates to a back door locking structure of sanitation car.

Background

The sanitation vehicle is a novel efficient cleaning device integrating road surface cleaning, garbage recycling and transportation, and is a special vehicle suitable for all-dimensional cleaning work of roads such as factories, highways, parks, squares and the like. The sanitation vehicle adopts a power device to drive a fan and a sweeper and cleans road surface garbage in modes of sweeper collection, water cleaning and negative pressure suction so as to clean the road surface. Meanwhile, the sanitation truck takes the pavement garbage into the garbage can of the upper loader, and transports the collected garbage to a garbage unloading site to dump the garbage so as to realize full-automatic operation.

The dustbin of sanitation car still has the back door structure that can open, and the dustbin of opening the back door is tumbled, can make the inside rubbish of dustbin pour out, and later sanitation personnel wash the dustbin and reset to close the back door, the sanitation car can get back to the place again at this moment and clean the operation.

In addition, the sealing between the garbage can and the rear door needs to be ensured, and the sewage in the garbage can is prevented from being exposed to cause environmental pollution. The sealing strip structure is usually arranged on the rear door, the sealing strip has a certain compression amount after the rear door is closed, the compression amount and the manufacturing precision of the sealing surface between the rear door and the garbage can are controlled, and the sealing between the garbage can and the rear door can be ensured. The compression amount of the sealing strip influences the pressing force of the rear door, namely the compression amount of the sealing strip is larger, the pressing force required by the rear door is also larger, the compression amount of the sealing strip also influences whether the locking structure on the rear door can lock the vehicle door or not, and the locking condition of the locking structure directly influences whether the rear door can be closed or not.

In the process that the back door is closed, the back door falls by self dead weight, and along with the sealing strip compression, also lean on the dead weight of back door to overcome the compression bounce of sealing strip and continue to fall, when the back door falls to the effectual operating position of locking mechanism, the back door side can lock. Because locking structure generally only when back door and dustbin box laminating a certain position, locking structure could lock the back door, in case the compression bounce of sealing strip can not be overcome to the dead weight of back door, then the back door will not fall smoothly, and locking structure then can not play a role, causes the unable phenomenon of closing of back door, has influenced sanitation car's use.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a suitability is strong, and promotes the tight structure of back door of sanitation car of locking ability, can overcome the compression bounce of sealing strip, prevents the unable condition of locking operation of locking structure.

The utility model provides a back door locking structure of sanitation car, include:

the garbage can comprises a sealing surface and a locking shaft, wherein an opening is formed in the sealing surface, and the locking shaft is fixed below the opening;

the rear door comprises a door plate and a sealing strip, the door plate is hinged above the opening in a mode of being capable of closing the opening, and the sealing strip is arranged on the inner side of the door plate facing the sealing surface;

the locking device comprises a pushing mechanism and a locking hook mechanism, the pushing mechanism is pulled and connected outside the door plate, the upper end of the pushing mechanism is hinged above the door plate, the lower end of the pushing mechanism is hinged with the locking hook mechanism, the locking hook mechanism can be arranged below the door plate relative to the locking shaft, the outer side of the door plate is provided with a locking hook rotating point, and the locking hook mechanism is rotatably arranged on the locking hook rotating point;

the outer side of the door plate is also provided with an upper rotating point, the upper rotating point is positioned above the locking hook rotating point, the locking hook mechanism is provided with a lower rotating point, and the gas spring is rotatably arranged on the upper rotating point and the lower rotating point.

As a preferred embodiment, when the latch hook mechanism hooks the latch shaft, the upper rotation point, the lower rotation point, and the latch hook rotation point can be formed on three vertices of a triangle, and the lower rotation point located at the outer side bypasses the latch hook rotation point.

As a preferred embodiment, the latch hook mechanism includes a connecting rod and at least one hook, the hook is connected to the connecting rod, and the connecting rod provides the lower rotation point for hinging the gas spring.

As a preferred embodiment, the hook has a base portion, a hook portion and a branch portion, the upper end of the base portion is hinged to the pushing mechanism, the lower end of the base portion is bent toward the locking shaft to form the hook portion for hooking the locking shaft, the base portion extends toward one side of the door panel to form a branch portion for hinging the rotation point of the hook, and the lower rotation point is located on the base portion corresponding to the branch portion.

The air spring seat is used for providing an upper rotating point for hinging the air spring, and the air spring seat can be fixed on the outer side of the door plate in an up-and-down adjustable mode.

As a preferred embodiment, the pushing mechanism includes a hydraulic cylinder, a sliding pin and a link assembly, the outer side of the door panel has a sliding slot hole, the sliding pin is slidably disposed in the sliding slot hole, the hydraulic cylinder is hinged above the door panel, an output shaft of the hydraulic cylinder is hinged to the sliding pin, and the link assembly is respectively hinged between the sliding pin and the latch hook mechanism.

In a preferred embodiment, the distance between the connecting rod assembly and the sliding pin shaft is adjustable according to the hinged position of the locking hook mechanism.

As a preferred embodiment, the connecting rod assembly includes an upper joint, a lower joint and a connecting rod body, so that the upper joint and the lower joint are respectively screwed to two ends of the connecting rod body in opposite directions, wherein the upper joint is hinged to the sliding pin shaft, and the lower joint is hinged to the latch hook mechanism.

As a preferred embodiment, the rear door further includes a sliding seat, the sliding seat includes two sliding plates, each of the sliding plates is provided with a sliding slot hole, the two sliding plates are fixed on the outer side of the door panel in a manner that the sliding slot holes are opposite to each other, the sliding pin shaft is located between the two sliding plates, two ends of the sliding pin shaft are respectively located in the sliding slot holes of the sliding plates on two sides, and the output shaft of the hydraulic cylinder and the upper joint are respectively hinged to the sliding pin shaft located between the two sliding plates.

The lock device is characterized by further comprising two hinged seats, wherein the two hinged seats are connected between the door panel and the sealing surface, and the lock device is located between the two hinged seats and is located in the center of the door panel.

Compared with the prior art, the technical scheme has the following advantages:

the air spring provides a pulling force to be overcome for the locking and rotating process of the lock hook mechanism, so that the lock hook mechanism is prevented from rotating too early and cannot rotate and lock at a locking position when the compression bounce force of the sealing strip is overcome by the rear door. In addition, the upper rotating point, the lower rotating point and the locking hook rotating point can be formed on three vertexes of a triangle, and in a locking state, the lower rotating point bypasses the locking hook rotating point and is positioned on the inner side of the locking hook rotating point, so that the locking hook mechanism is prevented from being automatically disengaged due to failure of the hydraulic cylinder and the like, and the reliability is effectively improved. The adaptability of the rear door locking device is improved by adjusting the air spring seat up and down and adjusting the connecting rod assembly, the structure is simple, and the feasibility of the rear door locking device is realized.

The present invention will be further described with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic structural view of a rear door locking structure of the sanitation truck of the present invention;

fig. 2 is a schematic view of a locking state of a rear door locking structure of the sanitation vehicle of the present invention;

fig. 3 is the open state schematic diagram of the back door locking structure of the sanitation vehicle.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

As shown in fig. 1 to 3, the rear door locking structure of the sanitation vehicle includes:

the garbage can 100 comprises a sealing surface 110 and a locking shaft 120, wherein an opening 111 is formed in the sealing surface 110, and the locking shaft 120 is fixed below the opening 111;

a rear door 200, wherein the rear door 200 comprises a door panel 210 and a sealing strip 220, the door panel 210 is hinged above the opening 111 in a manner of being capable of closing the opening 111, and the sealing strip 220 is arranged on the inner side of the door panel 210 facing the sealing surface 110;

a locking device 300, wherein the locking device 300 comprises a pushing mechanism 310 and a locking hook mechanism 320, the pushing mechanism 310 is pulled and tied outside the door panel 210, the upper end of the pushing mechanism 310 is hinged above the door panel 210, the lower end of the pushing mechanism 310 is hinged with the locking hook mechanism 320, the locking hook mechanism 320 can be arranged below the door panel 210 relative to the locking shaft 120, the outside of the door panel 210 has a locking hook rotating point D, and the locking hook mechanism 320 is rotatably arranged on the locking hook rotating point D;

and the outer side of the door panel 210 further has an upper rotation point C located above the latch hook rotation point D, the latch hook mechanism 320 has a lower rotation point E, and the gas spring 400 is rotatably disposed at the upper rotation point C and the lower rotation point E.

When the rear door 200 closes the opening 111 on the sealing surface 110, the rear door 200 falls under the action of its own weight, and the sealing strip 220 on the inner side of the door panel 210 is attached to the sealing surface 110, at this time, the sealing strip 220 is gradually compressed, that is, when the door panel 210 closes the opening 111 under the action of its own weight, the pushing mechanism 310 needs to overcome the increasingly larger compression resilience of the sealing strip 220, when the weight of the rear door 200 and the compression resilience of the sealing strip 220 are balanced and the rear door 200 is no longer moving, the pushing mechanism 310 gives a downward force to the latch hook mechanism 320, so that the latch hook mechanism 320 rotates clockwise around the latch hook rotation point D, and since the gas spring 400 is connected to the door panel 210 and the latch hook mechanism 320, the pulling force of the gas spring 400 needs to be overcome during the rotation of the latch hook mechanism 320, preventing the locking hook mechanism 320 from rotating too early to allow rotational locking in the locked position. Thereafter, the rear door 200 continues to close clockwise until the latch hook mechanism 320 is in the latched position, and the pushing mechanism 310 continues to apply a downward force to the latch hook mechanism 320 against the gas spring 400, so as to drive the latch hook mechanism 320 to rotate clockwise about the latch hook rotation point D until the latch shaft 120 is hooked to achieve latching.

As shown in fig. 3, when the rear door 200 is in the open state, the upper rotation point C, the lower rotation point E, and the latch hook rotation point D can be formed at three vertexes of a triangle, where the upper rotation point C is located at an upper side of the lower rotation point E and the latch hook rotation point D, respectively, and the lower rotation point E is located at an outer side of the latch hook rotation point D. When the rear door 200 is in a locking state, that is, the locking hook mechanism 320 hooks the locking shaft 120, and similarly, the upper rotation point C, the lower rotation point E, and the locking hook rotation point D can be formed on three vertices of a triangle, as shown in fig. 2, but the lower rotation point E bypasses the locking hook rotation point D and is located inside the locking hook rotation point D, and due to the effect of the gas spring 400, when the locking hook mechanism 320 is disengaged by itself due to failure of the hydraulic cylinder 311 and the like, the lower rotation point E can be rotated bypassing the locking hook rotation point D by overcoming the tensile force of the gas spring 400, that is, the gas spring 400 plays a role in preventing looseness, thereby effectively improving reliability.

As shown in fig. 1, the latch hook mechanism 320 includes a connecting rod 321 and at least one hook 322, the hook 322 is connected to the connecting rod 321, and the connecting rod 321 provides the lower rotation point E for hinging the gas spring 400.

Specifically, the connecting rod 321 is arranged along the width direction of the door panel 210, a plurality of hooks 322 are connected to the connecting rod 321 at equal intervals along the width direction of the door panel 210, and each hook 322 is independently hinged on the outer side of the door panel 210 to integrally rotate under the action of the pushing mechanism 310.

More specifically, referring to fig. 3, the hook 322 has a base portion 3221, a hook portion 3222 and a branch portion 3223, an upper end of the base portion 3221 is hinged to the pushing mechanism 310, a lower end of the base portion 3221 is bent toward the locking shaft 120 to form the hook portion 3222 for hooking the locking shaft 120, one side of the base portion 3221 facing the door panel 210 extends to form the branch portion 3223 for hinging the hook rotation point D, and the lower rotation point E is located on the base portion 3221 corresponding to the branch portion 3223. It can be seen that when the pushing mechanism 310 pushes the hook 322 to rotate clockwise, the lower rotation point E can rotate around the hook rotation point D, so that the lower rotation point E bypasses the hook rotation point D, so that the lower rotation point E moves past the dead point, and the hook locking mechanism 320 is prevented from disengaging itself, referring to fig. 2.

As shown in fig. 1, the rear door locking structure of the sanitation vehicle further includes a gas spring seat 500, the gas spring seat 500 providing the upper rotation point C for hinging the gas spring 400, and the gas spring seat 500 being adjustably fixed on the outer side of the door panel 210 up and down.

The upper and lower heights of the gas spring seat 500 are adjusted to adjust the position of the upper rotation point C, so that the gas spring 400 can obtain different pulling forces, the locking mechanism 320 can be ensured to hook the locking shaft 120, sanitation vehicles with different adaptability can be ensured, and the adaptability can be further improved. Wherein the up-and-down movement adjustment can be achieved by moving the gas spring housing 500 up and down and by the bolt and slot engagement, but is not limited thereto.

As shown in fig. 2 and 3, the pushing mechanism 310 includes a hydraulic cylinder 311, a sliding pin 312 and a link assembly 313, the outer side of the door panel 210 has a sliding slot 611, the sliding pin 312 is slidably disposed in the sliding slot 611, the hydraulic cylinder 311 is hinged above the door panel 210, an output shaft of the hydraulic cylinder 311 is hinged to the sliding pin 312, and the link assembly 313 is hinged between the sliding pin 312 and the latch hook mechanism 320.

The hydraulic cylinder 311 pushes and pulls, and drives the latch hook mechanism 320 to rotate through the connecting rod assembly 313. The hydraulic cylinder 311 is fixed above the door panel 210 through a cylinder hinge base 800, the cylinder hinge base 800 provides a cylinder rotation point a for the hydraulic cylinder 311, so that the hydraulic cylinder 311 can rotate around the cylinder rotation point a, an output shaft of the hydraulic cylinder 311 is hinged to the sliding pin 312 to drive the sliding pin 312 to move in the sliding slot hole 611, the sliding pin 312 drives the connecting rod assembly 313 to move, and the connecting rod assembly 313 drives the latch hook mechanism 320 to rotate. The sliding slot hole 611 is disposed along a length direction of the door panel 210.

Further, when the hydraulic cylinder 311 drives the sliding pin 312 to move down in the sliding slot 611, the latch hook mechanism 320 rotates clockwise to lock the door panel, referring to fig. 2. When the hydraulic cylinder 311 drives the sliding pin 312 to move up in the sliding slot 611, the latch hook mechanism 320 rotates counterclockwise to open the door panel, referring to fig. 3.

The distance between the link assembly 313 and the latch hook mechanism 320 is adjustable. Specifically, referring to fig. 1, the link assembly 313 includes an upper joint 3131, a lower joint 3132 and a link body 3133, so that the upper joint 3131 and the lower joint 3132 are respectively screwed to both ends of the link body 3133 in opposite directions, wherein the upper joint 3131 is hinged to the sliding pin 312 and the lower joint 3132 is hinged to the latch hook mechanism 320.

Wherein the connecting rod body 3133 is in forward-rotation threaded connection with the upper joint 3131, the connecting rod body 3133 is in reverse-rotation threaded connection with the lower joint 3132 to adjust the installation distance between F and G, thereby achieving different locking effects, where F is the hinge position of the latch hook mechanism 320 and the lower joint 3132, and G is the position of the sliding pin shaft 312. And then locked by a nut 3134, which is located at a position where the connecting rod body 3133 is screwed with the upper joint 3131.

As shown in fig. 1, the rear door 200 further includes a sliding base 600, the sliding base 600 includes two sliding plates 610, each of the sliding plates 610 is provided with a sliding slot hole 611, the two sliding plates 610 are fixed on the outer side of the door panel 210 in a manner that the sliding slot holes 611 are opposite to each other, the sliding pin 312 is located between the two sliding plates 610, two ends of the sliding pin 312 are respectively located in the sliding slot holes 611 of the sliding plates on two sides, and the output shaft of the hydraulic cylinder 311 and the upper joint 3131 are respectively hinged to the sliding pin 312 located between the two sliding plates 610. By adopting the structure, the up-and-down movement of the sliding pin shaft 312 is more stable, and the transmission reliability of the pushing mechanism 310 is ensured.

As shown in fig. 1, the rear door locking structure of the sanitation vehicle further includes two hinges 700, the two hinges 700 are connected between the door panel 210 and the sealing surface 110, and the lock device 300 is located between the two hinges 700 and at the center of the door panel 210. The hinge mount 700 provides a door rotation point B for the door 210 to rotate, so that the door 210 rotates around the door rotation point B, and the door 210 opens and closes the opening 111. And the lock device 300 is located at the center of the door panel 210, so that the opening and closing processes of the door panel 210 are smooth.

Referring to fig. 1 and 2, the panel 210 has an area larger than that of the opening 111, and the sealing strip 220 is disposed at the periphery of the inner side of the panel 210 such that when the panel 210 contacts the sealing surface 110, the sealing strip 220 is positioned between the panel 210 and the sealing surface 110, and the sealing strip 220 surrounds the periphery of the opening 111 to seal the opening 111.

In summary, the gas spring 400 is utilized to provide a pulling force to be overcome during the locking and rotating process of the latch hook mechanism 320, so as to prevent the latch hook mechanism 320 from rotating too early to perform the rotational locking at the locking position during the process of overcoming the compression and resilience of the sealing strip during the process of the rear door. In addition, the upper rotation point C, the lower rotation point E, and the latch hook rotation point D may be formed at three vertexes of a triangle, and in a locked state, the lower rotation point E bypasses the latch hook rotation point D and is located inside the latch hook rotation point D, thereby preventing the latch hook mechanism 320 from being disengaged by itself due to failure of the hydraulic cylinder 311, etc., and further effectively improving reliability. The installation distance between F and G is adjusted through the up-and-down adjustment of the air spring seat 500 and the connecting rod assembly 313, and the adaptability of the rear door locking device is improved, so that the rear door of most sanitation sweeper can be applied to the rear door structure, and the structure is simple and can be realized.

The above-mentioned embodiments are only used for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to limit the scope of the present invention in terms of implementation, which is not limited by the present embodiment, i.e. all equivalent changes or modifications made in accordance with the spirit disclosed by the present invention still fall within the scope of the present invention.

Claims

1. The utility model provides a back door locking structure of sanitation car which characterized in that includes:

the garbage can (100) comprises a sealing surface (110) and a locking shaft (120), wherein an opening (111) is formed in the sealing surface (110), and the locking shaft (120) is fixed below the opening (111);

a rear door (200), the rear door (200) comprising a door panel (210) and a sealing strip (220), the door panel (210) being hinged above the opening (111) in such a way as to be able to close the opening (111), the sealing strip (220) being arranged on the inner side of the door panel (210) facing the sealing surface (110);

a locking device (300), wherein the locking device (300) comprises a pushing mechanism (310) and a locking hook mechanism (320), the pushing mechanism (310) is pulled and connected to the outer side of the door panel (210), the upper end of the pushing mechanism (310) is hinged above the door panel (210), the lower end of the pushing mechanism (310) is hinged with the locking hook mechanism (320), the locking hook mechanism (320) can be arranged below the door panel (210) relative to the locking shaft (120), the outer side of the door panel (210) is provided with a locking hook rotating point (D), and the locking hook mechanism (320) is rotatably arranged on the locking hook rotating point (D);

the outer side of the door panel (210) is also provided with an upper rotating point (C), the upper rotating point (C) is positioned above the latch hook rotating point (D), the latch hook mechanism (320) is provided with a lower rotating point (E), and the gas spring (400) is rotatably arranged on the upper rotating point (C) and the lower rotating point (E).

2. The rear door locking structure of a sanitary vehicle according to claim 1, wherein the upper rotation point (C), the lower rotation point (E) and a hook rotation point (D) can be formed on three vertices of a triangle when the hook mechanism (320) hooks the locking shaft (120), and the lower rotation point (E) located at the outer side bypasses the hook rotation point (D).

3. The rear door locking structure of a sanitary car according to claim 1, wherein said locking hook mechanism (320) comprises a connecting rod (321) and at least one hook (322), said hook (322) being connected to said connecting rod (321), said connecting rod (321) providing said lower rotation point (E) for hinging said gas spring (400).

4. The rear door locking structure of a sanitation vehicle as claimed in claim 3, wherein the hook (322) has a base portion (3221), a hook portion (3222) and a branch portion (3223), the upper end of the base portion (3221) is hinged to the pushing mechanism (310), the lower end of the base portion (3221) is bent toward the locking shaft (120) to form the hook portion (3222) for hooking the locked shaft (120), the side of the base portion (3221) facing the door panel (210) extends to form the branch portion (3223) for hinging the hook rotation point (D), and the lower rotation point (E) is located on the base portion (3221) corresponding to the branch portion (3223).

5. The rear door locking structure of a sanitation vehicle as claimed in claim 1, comprising a gas spring seat (500), wherein the gas spring seat (500) provides the upper rotation point (C) for hinging the gas spring (400), and the gas spring seat (500) is fixed to an outer side of the door panel (210) to be adjustable up and down.

6. The rear door locking structure of the sanitation vehicle as claimed in claim 1, wherein the pushing mechanism (310) comprises a hydraulic cylinder (311), a sliding pin (312) and a link assembly (313), the outer side of the door panel (210) has a sliding slot hole (611), the sliding pin (312) is slidably disposed in the sliding slot hole (611), the hydraulic cylinder (311) is hinged above the door panel (210), an output shaft of the hydraulic cylinder (311) is hinged to the sliding pin (312), and the link assembly (313) is hinged between the sliding pin (312) and the locking hook mechanism (320), respectively.

7. The rear door locking structure of a sanitation vehicle as claimed in claim 6, wherein a position where the link assembly (313) and the locking hook mechanism (320) are hinged is adjustable in a distance from the sliding pin (312).

8. The rear door locking structure of a sanitation vehicle as claimed in claim 7, wherein the link assembly (313) includes an upper joint (3131), a lower joint (3132) and a link body (3133), so that the upper joint (3131) and the lower joint (3132) are respectively screwed to both ends of the link body (3133) in opposite directions, wherein the upper joint (3131) is hinged to the sliding pin (312) and the lower joint (3132) is hinged to the locking hook mechanism (320).

9. The rear door locking structure of a sanitation vehicle as claimed in claim 8, wherein the rear door (200) further comprises a sliding base (600), the sliding base (600) comprises two sliding plates (610), each sliding plate (610) is provided with a sliding slot hole (611), the two sliding plates (610) are fixed on the outer side of the door panel (210) in a manner that the sliding slot holes (611) are opposite, the sliding pin shaft (312) is located between the two sliding plates (610), and both ends of the sliding pin shaft (312) are respectively located in the sliding slot holes (611) of the two sliding plates, the output shaft of the hydraulic cylinder (311) and the upper joint (3131) are respectively hinged on the sliding pin shaft (312) located between the two sliding plates (610).

10. The rear door locking structure of a sanitary car according to claim 1, further comprising two hinge stands (700), wherein the two hinge stands (700) are connected between the door panel (210) and the sealing surface (110), and the locking device (300) is located between the two hinge stands (700) and at a central position of the door panel (210).