CN210339069U

CN210339069U - Tank container and protection box thereof

Info

Publication number: CN210339069U
Application number: CN201921085749.5U
Authority: CN
Inventors: 傅卫星; 蒋凯峰; 陈晓春; 张金珠; 傅钱陈; 沈轶
Original assignee: China International Marine Containers Group Co Ltd; Nantong CIMC Tank Equipment Co Ltd; CIMC Enric Investment Holdings Shenzhen Co Ltd
Current assignee: Zhongji An Ruihuan Technology Co ltd
Priority date: 2019-07-11
Filing date: 2019-07-11
Publication date: 2020-04-17
Anticipated expiration: 2029-07-11

Abstract

The utility model provides a tank container and protection box thereof. The protection box comprises a fixed box body, an extension box body and a box cover. The fixed box body is fixedly positioned at the bottom of the tank body and corresponds to the outer wall of the bottom of the tank body, is welded with the tank body and the frame and is provided with an opening facing to the end frame of the close frame; the bottom of the opening of the fixed box body is not higher than the upper surface of the end lower beam of the end frame and is connected with the end frame, and the top and the side part of the opening of the fixed box body have height difference with the end lower beam; the extension box body is connected to the opening of the fixed box body and is detachably connected with the fixed box body; the top of the extension box body is connected with the fixed box body, and the bottom of the extension box body extends to the lower end beam of the frame and is lapped on the lower end beam; the two ends of the extension box body are both opened, one end of the extension box body is connected with the fixed box body, and the other end of the extension box body faces the end frame; the box cover is hinged to the top end of the extension box body and is covered at the opening of the extension box body facing the end frame to be opened or closed relative to the extension box body.

Description

Tank container and protection box thereof

Technical Field

The utility model relates to a container field, in particular to tank container and protection box thereof.

Background

The tank container mainly includes a tank body and a frame supporting the tank body. The bottom of jar body one end is provided with the valve member, is provided with the protection box of user protection valve member in the outside of valve member, and the protection box can also increase security and operability in the transportation.

The current protective box generally extends from the bottom of the tank body to the end frame and extends to the upper part of the end lower beam, and forms a larger space together with the end upper beam to accommodate the valve.

The protection box is mainly assembled with the tank body and the frame in a welding mode, and processes such as derusting, paint spraying and the like are required after welding so as to avoid the protection box from being corroded. Generally, the protection box, the tank body and the frame are welded and connected into a whole and then are subjected to a paint spraying process in a unified manner so as to protect the tank container. The whole paint spraying leads to the difficult part that spouts to protection box and end underbeam contact of paint, for avoiding above-mentioned part corruption, generally will protect box and end underbeam welded connection. But this method increases the welding time and painting time in the tank container production line, so that the tank container production efficiency is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a higher tank container of production efficiency and protection box thereof to solve the problem among the prior art.

In order to solve the technical problem, the utility model provides a protection box for protect tank container's valve member, tank container is including a jar body and support the frame of the jar body includes: the fixed box body is positioned at the bottom of the tank body and corresponds to the outer wall of the bottom of the tank body, and the fixed box body is welded with the tank body and the frame and is provided with an opening facing to the end frame of the frame which is close to the tank body; the bottom of the opening of the fixed box body is not higher than the upper surface of the end lower beam of the end frame and is connected with the end frame, and the top and the side part of the opening of the fixed box body have height difference with the end lower beam; the extension box body is connected to the opening of the fixed box body and is detachably connected with the fixed box body; the top of the extension box body is connected with the fixed box body, and the bottom of the extension box body extends to the end lower beam of the frame and is lapped on the end lower beam; the two ends of the extension box body are both opened, one end of the extension box body is connected with the fixed box body, and the other end of the extension box body faces the end frame; the box cover is hinged to the top end of the extension box body and is arranged at the opening of the extension box body facing the end frame in a covering mode and is opened or closed relative to the extension box body.

In one embodiment, the fixing case includes: the fixing plate is positioned at the bottom of the tank body and corresponds to the outer wall of the bottom of the tank body; the fixing plate is connected with the tank body in a welding manner or connected with the frame in a welding manner or simultaneously connected with the tank body and the frame in a welding manner; the fixed plate is provided with an opening through which the valve element passes; the end plate is connected to the top end of the fixing plate and extends towards the end frame; two side plates respectively arranged at two sides of the end plate; the top end of each side plate is connected with the end plate in a welding mode, the bottom end of each side plate is connected with the frame in a welding mode, one side of each side plate is connected with the fixing plate in a welding mode, and the other side of each side plate extends towards the end frame; the bottom end of the side plate and the end lower beam have a height difference; the mounting plate is positioned below the fixing plate; one side of the mounting plate is connected with the frame in a welding mode, and the other side of the mounting plate is connected with the lower end beam in a welding mode.

In one embodiment, the fixing plate is inclined downward along the inclination direction of the tank, and the bottom of the fixing plate is welded to the frame and the tank.

In one embodiment, the extension box includes: one end of the top plate is lapped and detachably connected with the end plate, and the other end of the top plate is hinged with the box cover; the two connecting plates are arranged in one-to-one correspondence with the two side plates, and the connecting plates are lapped with the side plates and are detachably connected with the side plates; the bottom end of the connecting plate extends to the lower end beam and is lapped on the lower end beam; and the bottom plate is lapped on the mounting plate and is detachably connected with the mounting plate.

In one embodiment, a first mounting hole is formed in the end plate, a first connecting hole corresponding to the first mounting hole is formed in the top plate, and a fastener penetrates through the first mounting hole and the first connecting hole; the side plate is provided with a second mounting hole, the connecting plate is provided with a second connecting hole, and the fastener penetrates through the second mounting hole and the second connecting hole.

In one embodiment, the two connecting plates are fixedly connected with the top plate.

In one embodiment, at least two mounting plates are arranged at intervals along the width direction of the frame; a third mounting hole is formed in the mounting plate; at least two groups of third connecting holes are formed in the bottom plate, and the at least two groups of connecting holes are arranged in one-to-one correspondence with the at least two mounting plates; the bottom plate is lapped on the mounting plate, and a fastener penetrates through the third mounting hole and the third connecting hole.

In one embodiment, the box cover includes a body portion and a protruding portion, the protruding portion is coplanar with the body portion and protrudes from a bottom end of the body portion, two sides of the body portion exceed two sides of the protruding portion, the body portion is adapted to the opening, and a top end of the body portion is hinged to the top plate.

The utility model also provides a tank container, including a jar body, support the frame of the jar body and as above the protection box, jar body bottom is equipped with the valve member, the protection box is located the bottom of the jar body is located the outside of valve member.

In one embodiment, the frame comprises a bottom support plate and two side reinforcing plates, the bottom support plate and the two side reinforcing plates are arranged at the bottom of the tank body, the two side reinforcing plates are arranged at intervals along the width direction of the tank body, one end of each side reinforcing plate is fixedly connected with the bottom support plate, and the other end of each side reinforcing plate is welded with an end frame of the frame; the bottom of the fixing plate is connected with the bottom supporting plate and the tank body in a welding mode; the two side plates and the two side reinforcing plates are arranged in a one-to-one correspondence manner, the side plates are positioned above the side reinforcing plates, and the side plates are lapped and welded with the side reinforcing plates; the mounting plate is connected with the bottom support plate in a welding mode.

According to the above technical scheme, the utility model discloses an advantage lies in with positive effect:

the utility model discloses a protection box is including fixed box body, extend box body and lid, fixed box body sets up in the bottom of the jar body and corresponding with the outer wall of jar body bottom, fixed box body has the opening of the end frame that the orientation is close, the bottom of the opening part of fixed box body is not higher than the upper surface of the end underbeam of end frame and is connected with this end frame, the top and the lateral part of the opening part of fixed box body all have the difference in height with the end underbeam, and make fixed box body and jar body and frame assemble the completion back, fixed box body does not cover the end underbeam, make the end underbeam can expose and conveniently accept the rust cleaning and the process of spraying paint. Extend the box body and can dismantle with fixed box body and be connected, divide into fixed box body with the box body and extend the box body, reduced welding work volume, and extend the box body and can finish going on anytime and anywhere at fixed box body and jar body and frame mount, the flexibility is stronger, has improved tank container's production efficiency.

Drawings

FIG. 1 is a first directional view of one embodiment of a mesotank container according to the present invention;

FIG. 2 is a second directional view of one embodiment of the middle tank container of the present invention;

wherein the reference numerals are as follows: 1. a protection box; 111. a fixing plate; 112. an end plate; 113. a side plate; 114. mounting a plate; 121. a top plate; 122. a connecting plate; 123. a base plate; 13. a box cover; 131. a body portion; 132. a projection; 133. a handle; 21. an end frame; 22. a bottom support plate; 23. a side reinforcing plate; 31. a tank body; 32. and mounting the flange.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.

The utility model provides a tank container, including jar body 31, the frame and the protection box 1 of the support jar body 31. For convenience of description, the direction toward the inside of the frame is defined as the inside, and the direction toward the outside of the frame is defined as the outside.

The frame mainly comprises two end frames 21, two bottom side beams, a bottom support plate 22 and a side reinforcing plate 23. The two end frames 21 are arranged in parallel at intervals, the two bottom side beams are connected between the two end frames 21, and the two bottom side beams are arranged in parallel at intervals.

The two end frames 21 are a front end frame 21 and a rear end frame 21, respectively. The use state of the tank container is taken as a reference, one end close to the traction mechanism is a front end, and the other end is a rear end. At the front end is a front end frame 21, and at the rear end is a rear end frame 21. Unless otherwise specified, the following descriptions of the front end and the back end are consistent with this description.

The end frame 21 includes an upper end beam, a lower end beam, two parallel corner posts, two top corner pieces and two bottom corner pieces, and the upper end beam, the lower end beam and the two corner posts form a square frame structure by the two top corner pieces and the two bottoms. Wherein, the end upper beam is connected between the two top corner pieces, and the end lower beam is connected between the two bottom corner pieces.

The middle area of the end lower beam of the rear end frame 21 is provided with a notch, which is convenient for the installation, observation and operation of the valve.

The bottom support plate 22 is connected between the bottom side beams for supporting the tank 31. In this embodiment, a plurality of bottom support plates 22 may be provided at intervals along the length direction of the can 31.

Specifically, the upper edge of the bottom support plate 22 is generally concavely curved to match the shape of the circumferential profile of the bottom of the can 31 for supporting the can 31. The side reinforcing plate 23 is connected between the rear end frame 21 and the bottom support plate 22 adjacent to the rear end frame 21. In this embodiment, the number of the side reinforcing plates 23 is two, and the two side reinforcing plates 23 are provided at intervals in the width direction of the can body 31.

The side reinforcing plate 23 is perpendicular to the bottom support plate 22 and the end sill, and one end of the side reinforcing plate 23 is welded to the bottom support plate 22 and the other end is welded to the end sill for reinforcing the strength of the frame. The top end of the side reinforcing plate 23 is higher than the top of the end sill and the bottom end is higher than the bottom of the bottom corner piece along the height direction of the tank body 31. In the present embodiment, the side reinforcing plate 23 has a square shape.

The tank 31 is disposed in the frame for loading the material. Specifically, the tank 31 includes a cylinder, and end caps and a valve connected to both ends of the cylinder.

The bottom of the can 31 is provided with an opening. In this embodiment, the opening is disposed at the rear end of the can 31. A mounting flange 32 for mounting the valve member is attached to the opening, and the bottom of the mounting flange 32 extends beyond the lower surface of the can 31.

The valve comprises a loading and unloading valve for unloading the materials in the tank 31 outwards or adding the materials into the tank 31, a functional valve for detecting various data of the tank 31 and the like. Each valve member is mounted to the bottom of the can 31 by a mounting flange 32 and communicates with the interior of the can 31.

The protective case 1 is disposed at the bottom of the can 31 and outside the valve member for protecting the valve member.

The protection box 1 comprises a fixed box body, an extension box body and a box cover 13. The fixed box body is positioned at the bottom of the tank body 31 and corresponds to the outer wall of the bottom of the tank body 31, the extension box body is detachably connected with the fixed box body, and the box cover 13 is hinged with the extension box body.

The fixed box body comprises a fixed plate 111, an end plate 112, two side plates 113 and two mounting plates 114.

The fixing plate 111 is located at the bottom of the can 31 and corresponds to the outer wall of the bottom of the can 31. Specifically, the fixing plate 111 is inclined downward from the top end to the bottom end, and the inclined direction is matched with the tank 31, i.e., inclined downward in a direction away from the end plate 112. The top end of the fixing plate 111 is higher than the lower end beam, and the bottom end extends to the bottom support plate 22 and is welded with the bottom support plate 22.

The fixing plate 111 is further provided with an opening for the valve member to pass through. In this embodiment, the aperture is sized to fit the mounting flange 32. And the inner peripheral wall of the opening on the fixing plate 111 is welded and connected with the outer peripheral wall of the mounting flange 32, so that the connection strength of the fixing plate 111 is further increased.

Further, the portion of the fixing plate 111 located below the mounting flange 32 is matched in shape with the bottom contour of the can 31 and is welded to the outer wall of the can 31.

In other embodiments, the fixing plate 111 and the side plate 113 may be only welded to the can 31. For example, the fixing plate 111 has a curvature that matches the contour of the outer wall of the bottom of the can 31, the fixing plate 111 is welded to the can 31 only,

the end plate 112 is connected to the tip of the fixing plate 111 and extends toward the rear end frame 21. In this embodiment, the fixing plate 111 and the end plate 112 are integrally formed by bending. In other embodiments, the fixing plate 111 may be welded to the end plate 112.

In this embodiment, the end plate 112 extends toward the rear end frame 21 and does not extend beyond the inner side surface of the rear end frame 21 to the rear end frame 21. The end plate 112 is connected to the top end of the fixing plate 111, and thus there is a height difference between the end plate 112 and the end under beam.

The end plate 112 has a plurality of first mounting holes at an end thereof opposite to the fixing plate 111. The plurality of first mounting holes are provided at intervals in the width direction of the can 31.

Two side plates 113 are respectively disposed on both sides of the end plate 112. The top end of each side plate 113 is welded with the end plate 112, the bottom end is welded with the side reinforcing plate 23, one side of each side plate 113 is welded with the fixing plate 111, the other side extends towards the end frame 21, and a height difference is formed between the bottom end of each side plate 113 and the lower end beam;

in this embodiment, the side plate 113 has an inclined surface, which is inclined from the top to the bottom in the direction from the outside to the inside, and the inclined direction is the same as the inclined direction of the end socket of the can 31. In this embodiment, the side plate 113 has a right trapezoid shape.

The side plate 113 overlaps the side reinforcing plate 23, that is, the side plate 113 and the side reinforcing plate 23 have an overlapping portion in the height direction of the can body 31, and the overlapping portion is welded to fixedly connect the side plate 113 and the side reinforcing plate 23. In the present embodiment, the side reinforcing plate 23 is located outside the side plate 113.

The outer end of the side plate 113 is provided with a second mounting hole, that is, one end of the side plate 113 close to the rear end frame 21 is provided with a second mounting hole. In this embodiment, two second mounting holes are formed on the side plate 113 along the height direction of the can 31. In other embodiments, the number of the second mounting holes may also be set according to requirements, for example, three. The arrangement of the second mounting holes can also be set according to the requirement, for example, four second mounting holes in two rows and two columns are arranged.

The mounting plate 114 extends to the rear end frame 21 and is welded to the end underbeam. And the upper surface of mounting plate 114 is lower than the upper surface of the end sill. In this embodiment, the number of the mounting plates 114 is two, and the two mounting plates 114 are arranged at intervals in the width direction of the can 31. And the two mounting plates 114 are spaced apart from the two side reinforcing plates 23. Specifically, the two mounting plates 114 are respectively located inside the two side reinforcing plates 23. In other embodiments, the mounting plates 114 may be located on the outer sides of the two side reinforcing plates 23. In other embodiments, the number of mounting plates 114 may also be three or another number.

Each mounting plate 114 is provided with a third mounting hole. In this embodiment, two third mounting holes are provided at intervals along the length direction of the tank 31. In other embodiments, the number of the third mounting holes may be other, and may be set as required.

The fixing plate 111, the end plate 112, the two side plates 113 and the mounting plate 114 of the fixing box body enclose with the bottom support plate 22, the side reinforcing plate 23 and the rear end frame 21 to form a containing space for containing the valve, and the fixing box body has an opening facing the rear end frame 21. After the fixed box body is installed, the end lower beam is not covered by the fixed box body, so that the fixed box body and the end lower beam are exposed, and both the fixed box body and the end lower beam can be better derusted and sprayed with paint.

The extension box body is connected to the opening of the fixed box body and is detachably connected with the fixed box body. The two ends of the extension box body are both opened, one end of the extension box body is connected with the fixed box body, and the other end of the extension box body faces the end frame 21.

Specifically, the extension case includes a top plate 121, two side plates 113, and a bottom plate 123.

The top plate 121 is disposed horizontally below the end plate 112. One end of the top plate 121 is provided with a first connection hole. The first connecting hole and the first mounting hole are correspondingly arranged.

In this embodiment, when the top plate 121 is connected to the end plate 112, the top plate 121 is placed below the end plate 112, the first mounting hole corresponds to the first connecting hole, and the fastening member is inserted to detachably connect the top plate 121 and the end plate 112. Specifically, the fastener comprises a bolt and a nut, and when the fastener needs to be assembled, the bolt is inserted into the first connecting hole and the first mounting hole, and the nut is screwed up; when the bolt needs to be disassembled, the nut is unscrewed and the bolt is taken out. In other embodiments, the top plate 121 may be located above the end plate 112. The two connecting plates 122 are located on two sides of the top plate 121 and are arranged corresponding to the two side plates 113 one by one. Two connecting plates 122 are connected to both sides of the top plate 121 so that both ends of the extension case have openings.

Specifically, the connecting plate 122 extends downwardly beyond the side plate 113 and overlaps the end sill to the point where the end sill extends. In this embodiment, the connecting plate 122 is square.

One end of the connecting plate 122 is provided with a second connecting hole corresponding to the second mounting hole. When the connecting plate 122 is connected with the side plate 113, the connecting plate 122 is overlapped with the side plate 113, the two connecting plates 122 are respectively positioned at the inner sides of the two side plates 113, the second mounting holes correspond to the second connecting holes, and the fastener is inserted to realize the detachable connection of the side edge and the connecting plate 122. In other embodiments, the two connecting plates 122 may be located outside the two side plates 113.

In this embodiment, the two connecting plates 122 are fixedly connected with the top plate 121 to form a whole. In other embodiments, the connecting plate 122 and the top plate 121 may be separate components.

The bottom plate 123 is attached to the mounting plate 114 and is detachably connected to the mounting plate 114. Specifically, one end of the bottom plate 123 abuts against the bottom support plate 22, and the other end extends to the rear end frame 21.

Two sets of third connecting holes are formed in the bottom plate 123, and each set of third connecting holes is disposed corresponding to the third mounting holes of the mounting plates 114. When the bottom plate 123 is connected with the mounting plate 114, the bottom plate 123 is lapped on the mounting plate 114, and the fastener penetrates through the third mounting hole and the third connecting hole.

The box cover 13 is hinged to the top end of the extension box body, is covered on the extension box body and faces to the opening of the rear end frame 21, and is opened or closed relative to the extension box body. When the box cover 13 is opened, an operator can observe or operate the material loading and unloading valve in the protection box 1. When the box cover 13 is closed, the cover is arranged at the opening of the extension box body, so that the protection box 1 is in a closed state, and the valve in the protection box 1 is protected.

The cover 13 includes a body portion 131 and a protrusion portion 132. The body portion 131 is hingedly connected to the top plate 121. Specifically, the main body 131 is square, and has a top connected to the top plate 121, a bottom extending to the end lower beam, and two sides connected to the connecting plates 122 respectively to be matched with the opening of the box body.

The protrusion 132 is coplanar with the body 131 and protrudes toward the bottom end of the body 131. Specifically, the protrusion 132 is adapted to the shape of the notch at the end sill to seal the notch.

Both sides of the box cover 13 are connected with handles 133, which facilitates opening the box cover 13. In other embodiments, the handle 133 may be disposed on only one side of the box cover 13.

The utility model discloses a protection box 1 when the installation, will fix the box body and install on jar body 31 and frame, be about to fixed plate 111 and bottom sprag board 22 and mounting flange 32 welded connection, curb plate 113 and fixed plate 111, end plate 112 and lateral part reinforcing plate 23 welded connection, mounting panel 114 and bottom sprag board 22 welded connection. And processes such as rust removal and paint spraying are performed on the can 31, the frame, and the fixing plate 111, the side plate 113, and the mounting plate 114 of the protective case 1.

Meanwhile, the top plate 121 and the connecting plate 122 are welded and connected, the top plate 121, the bottom plate 123 and the box cover 13 are subjected to processes of derusting, painting and the like to form an extension box body, and the box cover 13 is hinged to the top of the top plate 121 to form a whole.

Then, the top plate 121 is detachably connected to the end plate 112, the connecting plate 122 is detachably connected to the side plate 113, and the bottom plate 123 is detachably connected to the mounting plate 114, thereby completing the mounting of the protection box 1.

Therefore, the installation of this protection box 1 is divided into fixed part installation and detachable part installation, wherein, the installation of fixed part fixed box body promptly and jar body 31 and frame are gone on together, and detachable part extends the installation that box body and lid 13 promptly and can finish the back anytime and anywhere going on at fixed box body and jar body 31 and frame installation promptly, and the flexibility is stronger, makes things convenient for the installation of protection box 1, and then has improved tank container's production efficiency.

In other embodiments, the detachable connection between the end plate 112 and the top plate 121, the detachable connection between the side plate 113 and the connecting plate 122, and the detachable connection between the bottom plate 123 and the mounting plate 114 may also be a snap connection, for example, a positioning hole is provided on one of the end plate 112 and the top plate 121, and a snap body is provided on the other, and the snap body is adapted to the positioning hole to detachably connect the end plate 112 and the top plate 121. The detachable connection of the end plate 112 to the top plate 121, the side plate 113 to the connecting plate 122, and the bottom plate 123 to the mounting plate 114 may also be a pop rivet, a self rivet, a snap connection, or an adhesive connection.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A protective cassette for protecting a valve member of a tank container including a tank body and a frame supporting the tank body, comprising:

the fixed box body is positioned at the bottom of the tank body and corresponds to the outer wall of the bottom of the tank body, and the fixed box body is welded with the tank body and the frame and is provided with an opening facing to the end frame of the frame which is close to the tank body; the bottom of the opening of the fixed box body is not higher than the upper surface of the end lower beam of the end frame and is connected with the end frame, and the top and the side part of the opening of the fixed box body have height difference with the end lower beam;

the extension box body is connected to the opening of the fixed box body and is detachably connected with the fixed box body; the top of the extension box body is connected with the fixed box body, and the bottom of the extension box body extends to the end lower beam of the frame and is lapped on the end lower beam; the two ends of the extension box body are both opened, one end of the extension box body is connected with the fixed box body, and the other end of the extension box body faces the end frame;

the box cover is hinged to the top end of the extension box body and is arranged at the opening of the extension box body facing the end frame in a covering mode and is opened or closed relative to the extension box body.

2. The protective case of claim 1, wherein the stationary case comprises:

the fixing plate is positioned at the bottom of the tank body and corresponds to the outer wall of the bottom of the tank body; the fixing plate is connected with the tank body in a welding manner or connected with the frame in a welding manner or simultaneously connected with the tank body and the frame in a welding manner; the fixed plate is provided with an opening through which the valve element passes;

the end plate is connected to the top end of the fixing plate and extends towards the end frame;

two side plates respectively arranged at two sides of the end plate; the top end of each side plate is connected with the end plate in a welding mode, the bottom end of each side plate is connected with the frame in a welding mode, one side of each side plate is connected with the fixing plate in a welding mode, and the other side of each side plate extends towards the end frame; the bottom end of the side plate and the end lower beam have a height difference;

the mounting plate is positioned below the fixing plate; one side of the mounting plate is connected with the frame in a welding mode, and the other side of the mounting plate is connected with the lower end beam in a welding mode.

3. The protective case according to claim 2, wherein the fixing plate is inclined downward in an inclined direction of the can, and a bottom of the fixing plate is welded to both the frame and the can.

4. The protective case of claim 2, wherein the extension case comprises:

one end of the top plate is lapped and detachably connected with the end plate, and the other end of the top plate is hinged with the box cover;

the two connecting plates are arranged in one-to-one correspondence with the two side plates, and the connecting plates are lapped with the side plates and are detachably connected with the side plates; the bottom end of the connecting plate extends to the lower end beam and is lapped on the lower end beam;

and the bottom plate is lapped on the mounting plate and is detachably connected with the mounting plate.

5. The protective box according to claim 4, wherein a first mounting hole is formed in the end plate, a first connecting hole corresponding to the first mounting hole is formed in the top plate, and a fastener is inserted through the first mounting hole and the first connecting hole;

the side plate is provided with a second mounting hole, the connecting plate is provided with a second connecting hole, and the fastener penetrates through the second mounting hole and the second connecting hole.

6. The protective case of claim 4, wherein the two connecting plates are fixedly connected to the top plate.

7. The protective case according to claim 4, wherein the mounting plates are provided at intervals of at least two in a width direction of the frame; a third mounting hole is formed in the mounting plate;

at least two groups of third connecting holes are formed in the bottom plate, and the at least two groups of connecting holes are arranged in one-to-one correspondence with the at least two mounting plates;

the bottom plate is lapped on the mounting plate, and a fastener penetrates through the third mounting hole and the third connecting hole.

8. The protective case according to claim 4, wherein the case cover comprises a body portion and a protruding portion, the protruding portion is coplanar with the body portion and protrudes from a bottom end of the body portion, two sides of the body portion extend beyond two sides of the protruding portion, the body portion fits into the opening, and a top end of the body portion is hinged to the top plate.

9. A tank container comprising a tank body provided with a valve member at the bottom thereof, a frame supporting the tank body, and a protective case according to any one of claims 2 to 8 located at the bottom of the tank body and outside the valve member.

10. The tank container according to claim 9, wherein the frame includes a bottom support plate and two side reinforcing plates provided at the bottom of the tank body, the two side reinforcing plates being provided at intervals in a width direction of the tank body, one ends of the side reinforcing plates being fixedly connected to the bottom support plate, and the other ends thereof being welded to an end frame of the frame;

the bottom of the fixing plate is connected with the bottom supporting plate and the tank body in a welding mode;

the two side plates and the two side reinforcing plates are arranged in a one-to-one correspondence manner, the side plates are positioned above the side reinforcing plates, and the side plates are lapped and welded with the side reinforcing plates;

the mounting plate is connected with the bottom support plate in a welding mode.