CN114060400A - One-way damping structure and uncovering structure - Google Patents

Abstract

The invention provides a one-way damping structure and a cover opening structure comprising the same, wherein the one-way damping structure comprises a fixed seat, an elastic body and a turnover plate; the turnover plate is rotatably connected to the fixed seat, and a rotating part is arranged between the turnover plate and the fixed seat to realize rotatable connection; the elastic body comprises a fixed part and a damping part connected to the fixed part, the fixed part is fixed on the fixed seat, the damping part faces the turnover plate, and the surface of the turnover plate close to the damping part is provided with a tooth block; in the process that the returning face plate overturns around the rotation portion, when the returning face plate overturns to be the smallest with the included angle of the fixing seat, the tooth block supports on the damping portion, along with the overturning face plate overturning and the included angle of the fixing seat becoming larger, the damping portion overturns the tooth block, and when the returning face plate overturns to be the largest with the included angle of the fixing seat, a gap is generated between the damping portion and the tooth block. The one-way damping structure is simple in structure and low in cost, and the one-way damping structure is reliable and stable in operation.

Description

One-way damping structure and uncovering structure

Technical Field

The invention belongs to the field of damping structures, and particularly relates to a one-way damping structure and a cover opening structure.

Background

The damping structure on the market at present can be divided into 3 kinds, two-way damping structure, spring one-way damping structure and check valve one-way damping structure. The bidirectional damping structure has a relatively simple structure and low cost, but the use performance of the bidirectional damping structure can not meet the special requirements of opening and closing the barrel cover sometimes because the two directions of opening and closing the bidirectional damping structure have damping forces; the spring one-way damping structure realizes the one-way damping function by means of compressing energy storage when the barrel cover falls down and closes and releasing elasticity when the barrel cover is lifted and opened, the structure is simple and low in cost, but the service life of the spring of the structure is limited, and if the spring force required by realizing slow damping descent by only depending on the spring one-way damping structure is larger than gravity, the barrel cover cannot keep a natural closing state, an additional buckle structure is required to lock the position of the barrel cover, and the application range of the spring one-way damping structure is limited; the one-way damping structure of the one-way valve is widely applied, and is widely applied to equipment such as a toilet lid, an automobile trunk and the like due to small volume, light weight, large damping force range and stable and reliable structure, but the cost is high, and the one-way damping structure is not beneficial to products which seek simple and low-cost realization of the one-way damping slow-falling effect.

Therefore, how to realize the one-way damping effect of the product through a simpler structure is a research focus of technicians in the field.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the one-way damping structure and the cover opening structure comprising the one-way damping structure, and the good one-way damping effect can be realized through a simple structure.

In order to achieve the purpose, the invention provides the following technical scheme: a unidirectional damping structure comprises a fixed seat, an elastic body and a turnover plate; the turnover plate is rotatably connected to the fixed seat, and a rotating part is arranged between the turnover plate and the fixed seat to realize the rotatable connection; the elastic body comprises a fixed part and a damping part connected to the fixed part, the fixed part is fixed on the fixed seat, the damping part faces the turnover plate, and a tooth block is arranged on the surface of the turnover plate close to the damping part; the roll-over plate winds the in-process of rotation portion upset, work as the roll-over plate upset with when the fixing base contained angle is minimum, the tooth piece supports on the damping portion, along with the roll-over plate upset with the fixing base contained angle grow, the damping portion has overturned the tooth piece, work as the roll-over plate upset with when the fixing base contained angle is maximum, the damping portion with produce the gap between the tooth piece.

Through above-mentioned technical scheme, work as the returning face plate with the fixing base contained angle is minimum, the tooth piece supports on the damping portion, work as after the certain angle of returning face plate upset, the damping portion by at first with the returning face plate supports to the extrusion deformation, the damping portion is by extrusion deformation big more, and the damping effect is better, realizes steadily opening the effect of returning face plate. And continuing to turn over, and recovering the extrusion deformation until the turning plate is separated from the damping part. Due to the adoption of the surface extrusion mode, the damping effect of the whole structure is more durable, the service life is longer, and the problem that the spring damper is easy to cause spring fatigue is avoided.

The invention is further provided that the fixed seat is provided with a groove, and the damping part is arranged in the groove.

The invention is further arranged in that the groove comprises a lower curved surface and an upper curved surface, when the turnover plate is turned to the minimum included angle with the fixed seat, the damping part is pressed on the lower curved surface, the damping part is pressed on the upper curved surface in the rotation process of the turnover plate, and the damping part is pressed on the lower curved surface again along with the turning of the turnover plate and the increase of the included angle of the fixed seat.

The invention is further configured that the damping part comprises a middle part and a damping head part, one end of the middle part is connected with the fixing part, the other end of the middle part is connected with the damping head part, and one side of the damping head part, which is used for contacting the tooth block, is provided with a contact curved surface.

Further, the damping head is strip-shaped, the middle part and the fixing parts are consistent in number and are more than two, and two ends of the damping head are placed in the grooves.

Through the technical scheme, the middle part and the fixing part form a plurality of long arm structures, so that the elasticity of the elastic body is increased, the frictional damping is smaller when the turnover plate is opened, meanwhile, the elastic body is kept at a working position in a natural state, and the reliability of the one-way damping structure is improved.

Further, the fixing part is detachably fixed on the fixing seat. Preferably, the fixing part is provided with an upper mounting hole, the fixing seat is provided with a lower mounting hole, and the upper mounting hole and the lower mounting hole are fixed together through a screw.

Through the technical scheme, the elastic body is fixed through the screw, so that the position of the damping block is accurate and the damping block can work reliably. For the sake of beauty and convenient operation, the lower mounting hole can adopt a threaded hole, and can be disassembled and assembled for many times.

The invention is further arranged in that the included angle between the middle part and the fixing part is an obtuse angle, and the radius of the contact curved surface is smaller than that of the damping head part.

The invention is further configured such that the intermediate portion and the damping head are made of rubber or polyurethane.

The invention is further arranged in that a plurality of tooth blocks are arranged on the surface of the turnover plate close to the fixed seat to form a tooth surface, the tooth blocks successively turn over the damping head in the turnover process of the turnover plate around the rotating part, and when the turnover plate turns to the maximum included angle with the fixed seat, a gap is formed between the tooth blocks and the damping head.

Through the technical scheme, the face of the turnover plate, which is in contact with the damping head, is an uneven tooth surface, so that the damping head is in contact with the turnover plate more fully and reliably, and the one-way damping structure can work more reliably.

The invention is further arranged such that when the roll-over plate is turned over to different angles, different tooth blocks abut against the damping head to fix the roll-over plate.

Through the technical scheme, the turnover plate and the surface contacted with the damping head are uneven tooth surfaces and convex, friction damping is larger, the compression amount of the elastic body is increased, the elasticity is increased, and therefore the turnover plate can be stopped at a certain angle after being opened when the turnover plate is in a state of not receiving force except gravity, and a product provided with the one-way damping structure is safer and more convenient to install.

The invention is further arranged in that the rotating part is a rotating shaft connected to the fixed seat, the turnover plate is provided with a rotating hole, the two outer side ends of the rotating shaft are inserted into the rotating hole, and the turnover plate performs reciprocating turnover motion around the rotating shaft.

Furthermore, one rotating shaft is arranged, the rotating shaft is fixed on the fixed seat, and two ends of the rotating shaft penetrate out of the fixed seat; or two rotating shafts are coaxially fixed on two sides of the fixed seat respectively.

The invention also provides a cover opening structure, which comprises the unidirectional damping structure, a barrel cover and a barrel body; the barrel body comprises a front side plate, a rear side plate, a left side plate and a right side plate, and the fixed seat is connected to the rear side plate; the barrel cover comprises an upper cover and a lower cover, and the turnover plate is connected with the lower cover; the utility model discloses a reciprocating turnover device, including a fixing base, a roll-over plate, rotation portion, upper cover, lower rotation hole, upper cover, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, lower.

The invention is further arranged that the outer side surface of the lower cover above the front side plate and the rear side plate is provided with a protruding step, the inner side surface of the upper cover is provided with a notch, and the notch of the upper cover is clamped on the step of the lower cover.

Further, the upper cover and the lower cover may be detachably fixed together by screws. Preferably, the upper cover is provided with an upper mounting hole, the lower cover is provided with a lower mounting hole, and the upper mounting hole and the lower mounting hole are fixed together through a screw.

Through the technical scheme, the upper cover and the lower cover can be disassembled and assembled for many times. For aesthetic reasons, the upper mounting holes may be threaded holes.

In conclusion, the invention has the following beneficial effects:

(1) the one-way damping device has the advantages of simple structure and low cost, and can realize the one-way damping effect only by adding the elastic body with a specific shape near the overturning part of the existing product (such as a toilet, an automobile trunk, a garbage can and the like). Aiming at the barrel cover, the unidirectional damping structure of the invention is only needed to be added at the connecting part of the barrel cover and the barrel body;

(2) the contact surface of the turnover plate and the elastic body is an uneven tooth surface, so that the elastic body and the turnover plate are contacted more fully and reliably, and the one-way damping structure works more reliably; the uneven tooth surface can ensure that the turnover plate can be fixed at different angles in the turnover process, and is stable and convenient;

(3) the elastic body is fixed through the screw, and the elasticity of the elastic body is increased by the middle part, so that the position accuracy and the working reliability of the damping block are ensured;

(4) the upper cover and the lower cover are detachably arranged together, so that the upper cover and the lower cover are convenient to disassemble and assemble for many times; the notches and the steps which are matched with each other are arranged, so that the fixing and the limiting can be better realized.

Drawings

FIG. 1 is a schematic structural view of a one-way damping structure (a turnover plate is provided with a toothed block);

FIG. 2 is a schematic structural view of a one-way damping structure (a turnover plate with a tooth block and a fixed seat);

FIG. 3 is a schematic structural view of a one-way damping structure (the turnover plate has a plurality of tooth blocks, and the included angle between the turnover plate and the fixed seat is minimum);

FIG. 4 is a schematic structural view of a one-way damping structure (the turnover plate has a plurality of tooth blocks, and the turnover plate and the fixed seat form a certain included angle);

FIG. 5 is a schematic structural view of a one-way damping structure (the turnover plate has a plurality of tooth blocks, and the included angle between the turnover plate and the fixed seat is the largest);

FIG. 6 is a schematic structural view of a one-way damping structure (the turnover plate is provided with a plurality of tooth blocks, and the turnover plate is fixed on the tooth blocks);

FIG. 7 is a schematic structural view of an elastomer;

FIG. 8 is a front view of the elastomer of FIG. 7;

fig. 9 is a schematic structural view of the lid opening structure (the lid is in a closed state);

fig. 10 is a schematic structural view of the lid opening structure (the lid is in an open state);

fig. 11 is a schematic sectional view of the lid opening structure (lid closed state);

FIG. 12 is an enlarged view of the turning part of the tub cover and the tub body in FIG. 11;

FIG. 13 is an exploded view of the lid release structure;

fig. 14 is a schematic view of a connection structure of a lower cap and an elastic body.

Wherein, 1, fixing the base; 2. a turnover plate; 2-1, a tooth block; 3. an elastomer; 3-1, a fixing part; 3-2, a damping part; 3-2-1, the middle portion; 3-2-2, damping head; 3-2-3, contacting the curved surface; 4. a gap; 5. fixing a column; 6. a groove; 6-1, lower curved surface; 6-2, upper curved surface; 7. a screw; 8. a rotating shaft; 9. a barrel body; 9-1, a front side plate; 9-2, a rear side plate; 9-3, a left side plate; 9-4, a right side plate; 10. an upper cover; 11. a lower cover; 12. an upper rotation hole; 13. a lower rotation hole; 14. a step; 15. a notch; 16. a limiting block; 17. and (4) screws.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As an embodiment of the unidirectional damping structure of the present invention, referring to fig. 1 and 2, the unidirectional damping structure includes a fixing base 1, an elastic body 3 and a flipping board 2. The roll-over plate 2 rotationally connects on the fixing base 1, roll-over plate 2 with be equipped with the rotation part between the fixing base 1 in order to realize rotationally connect, the rotation part can be the pivot among the prior art, and the existence form of pivot is like the hinge etc.. The elastic body 3 comprises a fixed part 3-1 and a damping part 3-2 connected to the fixed part 3-1, the fixed part 3-1 is fixed on the fixed seat 1, the damping part 3-2 faces the turnover plate 2, and a tooth block 2-1 is arranged on the surface of the turnover plate 2 close to the damping part 3-2; in the process that the turnover plate 2 overturns around the rotating part, when the turnover plate 2 overturns to form the smallest included angle with the fixing seat 1, the tooth blocks 2-1 abut against the damping part 3-2, the damping part 3-2 overturns over the tooth blocks 2-1 along with the enlargement of the included angle between the turnover plate 2 and the fixing seat 1, and when the turnover plate 2 overturns to form the largest included angle with the fixing seat 1, gaps are formed between the damping part 3-2 and the tooth blocks 2-1.

Referring to fig. 1, only one tooth block 2-1 is set, when the included angle between the turnover plate 2 and the fixed seat 1 is minimum, the tooth block 2-1 abuts against the damping part 3-2, and when the turnover plate 2 is turned over for a certain angle, the damping part 3-2 initially abuts against the turnover plate 2 to be extruded and deformed. And continuing to turn over, recovering the extrusion deformation until the turnover plate 2 is separated from the damping part 3-2, opening the turnover plate 2, and selecting the bending degree and the contact area of the contact part of the damping part 3-2 and the tooth block 2-1 according to the size of actual use requirements.

Preferably, referring to fig. 2, a groove 6 is formed on the fixed seat 1, and the damping portion 3-2 is disposed in the groove 6.

Further, referring to fig. 2, the groove 6 includes a lower curved surface 6-1 and an upper curved surface 6-2, when the roll-over plate 2 is turned over to have the smallest included angle with the fixing seat 1, the damping portion 3-2 presses on the lower curved surface 6-1, during the rotation of the roll-over plate 2, the damping portion 3-2 presses on the upper curved surface 6-2, and as the roll-over plate 2 is turned over and the included angle of the fixing seat 1 becomes larger, the damping portion 3-2 presses on the lower curved surface 6-1 again. The upper curved surface 6-2 and the lower curved surface 6-1 limit the overturning angle interval of the damping part 3-2, so that the overturning angle can be conveniently controlled.

Preferably, referring to fig. 7 and 8, the damping portion 3-2 includes an intermediate portion 3-2-1 and a damping head portion 3-2-2, one end of the intermediate portion 3-2-1 is connected to the fixing portion 3-1, the other end of the intermediate portion 3-2-1 is connected to the damping head portion 3-2-2, and a contact curved surface 3-2-3 is provided on a side of the damping head portion 3-2-2 for contacting the tooth block 2-1.

Further, referring to fig. 7, the included angle between the middle portion 3-2-1 and the fixing portion 3-1 is an obtuse angle, and the radius of the contact curved surface 3-2-3 is smaller than that of the damping head portion 3-2-2.

Further, referring to fig. 7, the damping head 3-2-2 is strip-shaped, the number of the middle part 3-2-1 and the number of the fixing parts 3-1 are both more than two, and two ends of the damping head 3-2-2 are placed in the grooves 6. The middle part 3-2-1 and the fixing part 3-1 form more than two long arm structures, so that the elasticity of the elastic body 3 is increased, the friction damping is smaller when the turnover plate 2 is opened, meanwhile, the elastic body 3 is kept at a working position in a natural state, and the reliability of the one-way damping structure is improved.

Further, referring to fig. 13, the fixing portion 3-1 is detachably fixed on the fixing base 1. Preferably, the fixing portion 3-1 is provided with an upper mounting hole, and the fixing seat 1 is provided with a lower mounting hole. Specifically, a fixing column 5 can be arranged on the fixing seat 1, a lower mounting hole is formed in the fixing column 5, and the upper mounting hole and the lower mounting hole are fixed together through a screw 7. Specifically, the lower mounting hole can adopt a threaded hole, so that the novel LED lamp is more attractive and can be disassembled and assembled for multiple times.

In order to make the middle part 3-2-1 and the damping head 3-2-2 have a certain elasticity, the material of the middle part 3-2-1 and the damping head 3-2-2 is rubber or polyurethane.

In this embodiment, it is set that the face of the roll-over plate 2 close to the fixed seat 1 is provided with a plurality of tooth blocks 2-1 to form an uneven tooth surface, in the process of turning the roll-over plate 2 around the rotating part, the tooth blocks 2-1 can successively roll over the damping head 3-2-2, the damping head 3-2-2 is more fully and reliably contacted with the roll-over plate 2, when the roll-over plate 2 is turned to the maximum included angle with the fixed seat 1, a gap 4 is generated between the tooth blocks 2-1 and the damping head 3-2-2, and the roll-over plate 2 is opened. Turning process of the turning plate 2 with a plurality of tooth blocks 2-1 is shown in fig. 3-5, and the broken line in fig. 4 is a turning track. Similarly, the turning plate 2 with only one tooth block 2-1 is turned in a similar manner. Fig. 5 is a structural state when the included angle between the turning plate 2 and the fixing seat 1 is the largest, and the fixing seat 1 is connected with a limiting block 16 for limiting the maximum angle of the tooth block 2-1 and the turning plate 2.

Further, referring to fig. 6, since the damping action of each tooth block 2-1 and the damping head 3-2-2 is very reliable, when the roll-over plate 2 is turned over to different angles, different tooth blocks 2-1 abut against the damping head 3-2-2 to fix the roll-over plate 2, or the damping head 3-2-2 abuts against and is fixed between adjacent tooth blocks 2-1, it can be seen that the roll-over angle of the roll-over plate 2 can be flexibly controlled and stably fixed, when fixed, except the contact position of the convex tooth surface and the damping head 3-2-2, the frictional damping is larger, and the compression amount of the elastic body 3 is increased, and the elastic force is increased, thereby further ensuring that the roll-over plate 2 can stop at a certain angle after being opened under the state of not receiving the force other than gravity, thereby the product of this one-way damping structure of messenger's installation is safer convenient.

The invention is further arranged in a way that, referring to fig. 2-6, the rotating part is a rotating shaft 8 connected to the fixed seat 1, the turning plate 2 is provided with a rotating hole, two outer side ends of the rotating shaft 8 are inserted into the rotating hole, and the turning plate 2 performs reciprocating turning motion around the rotating shaft 8.

Furthermore, one rotating shaft 8 is provided, the rotating shaft 8 is fixed on the fixed seat 1, and two ends of the rotating shaft 8 penetrate through the fixed seat 1; or, two rotating shafts 8 are coaxially fixed on two sides of the fixed seat 1 respectively.

Example 2

The present invention provides a door-opening structure, see fig. 9-14, comprising the above-described one-way damping structure. The uncovering structure comprises a barrel cover and a barrel body 9; the barrel body 9 comprises a front side plate 9-1, a rear side plate 9-2, a left side plate 9-3 and a right side plate 9-4, and the fixed seat 1 is connected to the rear side plate 9-2; the barrel cover comprises an upper cover 10 and a lower cover 11, and the turnover plate 2 is connected with the lower cover 11; the rotation portion is connected rotation axis 8 on the fixing base 1, lower rotation hole 13 has been seted up on the returning face plate 2, lower rotation hole 13 is the open hole in upper portion, be equipped with on the upper cover 10 and rotate hole 12, it is the open hole in lower part to rotate hole 12, it is located to rotate hole 12 down on the rotation hole 13, two outside ends of rotation axis 8 are inserted in the space between upper rotation hole 12 and lower rotation hole 13, upper cover 10 with lower cover 11 detachably is fixed together and around rotation axis 8 is reciprocal flip motion.

Further, referring to fig. 11 and 12, the upper cover 10 and the lower cover 11 may be detachably fixed together by screws 17. The circular open holes of the upper rotating hole 12 and the lower rotating hole 13 provide a rotating space for the rotating shaft 8, the arc-shaped holes have a certain limiting effect, and the arc-shaped holes are fixed together through fixing pieces such as screws 17, so that the stability of the structure is guaranteed. Preferably, the upper cover 10 is provided with an upper mounting hole, the lower cover 11 is provided with a lower mounting hole, and the upper mounting hole and the lower mounting hole are fixed together through a screw 17, so that the upper cover and the lower cover can be disassembled and assembled for multiple times. For aesthetic reasons, the upper mounting hole can adopt a threaded hole.

Referring to fig. 12, the present invention is further configured such that a protruding step 14 is disposed on an outer side surface of the lower cover 11 above the front side plate 9-1 and the rear side plate 9-2, a notch 15 is disposed on an inner side surface of the upper cover 10, and the notch 15 of the upper cover 10 is clamped on the step 14 of the lower cover 11. When the device is installed, the lower rotating hole 13 of the lower cover 11 can be firstly sleeved on the lower portion of the rotating shaft 8, then the upper rotating hole 12 of the upper cover 10 is sleeved on the upper portion of the rotating shaft 8, at this time, the front and the rear steps 14 of the outer side surface of the lower cover 11 correspond to the front and the rear notches 15 of the inner side surface of the upper cover 10, the notches 15 are clamped on the steps 14, the whole upper cover 10 is fixed on the lower cover 11, and the notches 15 and the steps 14 play roles of fixing and limiting. Finally, the upper cover 10 and the lower cover 11 are assembled by being fixed together by a fixing member such as a screw 17.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A unidirectional damping structure is characterized by comprising a fixed seat, an elastic body and a turnover plate; the turnover plate is rotatably connected to the fixed seat, and a rotating part is arranged between the turnover plate and the fixed seat to realize the rotatable connection; the elastic body comprises a fixed part and a damping part connected to the fixed part, the fixed part is fixed on the fixed seat, the damping part faces the turnover plate, and a tooth block is arranged on the surface of the turnover plate close to the damping part; the roll-over plate winds the in-process of rotation portion upset, work as the roll-over plate upset with when the fixing base contained angle is minimum, the tooth piece supports on the damping portion, along with the roll-over plate upset with the fixing base contained angle grow, the damping portion has overturned the tooth piece, work as the roll-over plate upset with when the fixing base contained angle is maximum, the damping portion with produce the gap between the tooth piece.

2. The one-way damping structure according to claim 1, wherein the fixing base is provided with a groove, and the damping portion is disposed in the groove.

3. The unidirectional damping structure of claim 2, wherein the groove comprises a lower curved surface and an upper curved surface, when the turnover plate is turned to the minimum included angle with the fixing seat, the damping part is pressed on the lower curved surface, in the rotation process of the turnover plate, the damping part is pressed on the upper curved surface, and when the turnover plate is turned to the maximum included angle with the fixing seat, the damping part is pressed on the lower curved surface again.

4. The unidirectional damping structure of claim 1, wherein the damping portion comprises an intermediate portion and a damping head portion, one end of the intermediate portion is connected to the fixing portion, the other end of the intermediate portion is connected to the damping head portion, and one side of the damping head portion, which is used for contacting the tooth block, is provided with a contact curved surface.

5. The unidirectional damping structure of claim 4, wherein the included angle between the middle portion and the fixing portion is an obtuse angle, and the radius of the curved contact surface is smaller than the radius of the damping head portion.

6. The one-way damping structure of claim 4, wherein the face of the turnover plate close to the fixed seat is provided with a plurality of tooth blocks to form tooth faces, the tooth blocks successively turn over the damping head in the turnover process of the turnover plate around the rotating part, and when the turnover plate turns to the maximum included angle with the fixed seat, a gap is formed between the tooth blocks and the damping head.

7. The unidirectional damping structure of claim 6, wherein different ones of the blocks abut against the damping head to secure the flipping plate when the flipping plate is flipped to different angles.

8. The unidirectional damping structure of claim 1, wherein the rotating portion is a rotating shaft connected to the fixed seat, the flipping plate is provided with a rotating hole, two outer ends of the rotating shaft are inserted into the rotating hole, and the flipping plate performs reciprocating flipping motion around the rotating shaft.

9. An open cover structure, comprising the unidirectional damping structure of any one of claims 1 to 7, and a lid and a tub; the barrel body comprises a front side plate, a rear side plate, a left side plate and a right side plate, and the fixed seat is connected to the rear side plate; the barrel cover comprises an upper cover and a lower cover, and the turnover plate is connected with the lower cover; the utility model discloses a reciprocating turnover device, including a fixing base, a roll-over plate, rotation portion, upper cover, lower rotation hole, upper cover, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, rotating shaft, lower cover, lower.

10. The door opening structure according to claim 9, wherein a protruding step is provided on an outer side surface of the lower cover above the front side plate and the rear side plate, a notch is provided on an inner side surface of the upper cover, and the notch of the upper cover is caught on the step of the lower cover.

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