Screen adsorption type protective shell

Abstract

The utility model relates to the technical field of protective shells, and discloses a screen adsorption type protective shell, which comprises a bottom shell, a screen plate shell, a soft layer and an adsorption module, two ends of the soft layer are respectively butted with the bottom shell and the screen plate shell, the soft layer is used for folding or unfolding the bottom shell and the screen plate shell, and the screen plate shell is used for covering a screen of electronic equipment; the adsorption module comprises two outer shell blocks and two outer plate blocks, the outer plate blocks are installed on the screen plate shell, the outer shell blocks are installed on the bottom shell, and the two outer shell blocks and the two outer plate blocks are in one-to-one correspondence and are arranged in an adsorption mode. Under the action of the soft layer, folding and unfolding of the bottom shell and the screen plate shell are realized, and meanwhile, a screen of the electronic equipment is protected through the screen plate shell; in the folding state, under the adsorption matching action of the two outer shell blocks and the two outer plate blocks, the adsorption force on the screen plate shell is improved, so that it is guaranteed that the screen plate shell is in the covering state, the screen plate shell is prevented from being opened by mistake, and then the covering effect of the screen plate shell and the folding effect of the protective shell are guaranteed.

Description

Technical Field

[0001] The utility model patent relates to the technical field of protective shells, and specifically, to a screen adsorption type protective shell. Background Art

[0002] With the development of science and technology, electronic devices tend to develop in the direction of folding, such as folding mobile phones and folding tablets. Therefore, by using folding screen protective cases to flip and wrap electronic devices, effective protection can be achieved against drops, bumps and collisions.

[0003] For example, a prior patent with publication number CN216252879U discloses a rotating shaft magnetic full-cover hinge folding screen protective shell, including a front protective shell, a rear protective shell and a hinge protective shell, one side of the hinge protective shell is connected to the rear protective shell through a hinge, and a magnetic positioning mechanism is provided between the other side of the hinge protective shell and the front protective shell; the magnetic positioning mechanism includes a hinge magnet and a front cover magnet, the hinge magnet is fixed on the hinge protective shell, the front cover magnet is fixed on the side of the front protective shell, and the hinge magnet and the front cover magnet are attracted to each other.

[0004] In the prior art, the front protective shell and the hinge protective shell are adsorbed by a magnetic positioning mechanism. During actual use, the adsorption and covering effect of the front protective shell (screen panel shell) is poor, and it is easy to be opened by mistake, which affects the protection of the electronic device by the protective shell and is inconvenient to carry. Utility Model Content

[0005] The utility model aims to provide a screen adsorption type protective shell, aiming to solve the problem of poor screen plate shell adsorption covering effect in the prior art.

[0006] The utility model is implemented as follows: a screen adsorption type protective shell comprises a bottom shell, a screen plate shell, a soft layer and an adsorption module, the two ends of the soft layer are respectively arranged to be docked with the bottom shell and the screen plate shell, the soft layer is used for the bottom shell and the screen plate shell to be folded or unfolded, and the screen plate shell is used to cover the screen of the electronic device; the adsorption module comprises two outer shell blocks and two outer plate blocks, along the length direction of the screen plate shell, the two outer plate blocks are arranged correspondingly at both ends, and the outer plate blocks are installed on the screen plate shell, and the outer shell block is installed on the bottom shell, the two outer shell blocks and the two outer plate blocks are in one-to-one correspondence and adsorption arrangement.

[0007] Furthermore, along the width direction, the screen plate shell has a plate outer edge, the plate outer edge is arranged close to the outside, the outer plate block is arranged on the plate outer edge, the bottom shell has a shell outer edge, and the outer shell block is arranged on the shell outer edge.

[0008] Furthermore, the outer edge of the shell is concave downward in an arc shape, the outer shell block is concave downward in an arc shape, the outer edge of the plate is arched downward in an arc shape, the outer plate block is arched downward in an arc shape, and the outer plate and the outer shell block are flatly arranged in adsorption.

[0009] Furthermore, the bottom shell has a shell frame edge and a shell outer edge, the shell frame edge is horizontally arranged, the shell frame edge and the shell outer edge are butt-arranged, and along the direction away from the shell frame edge, the shell outer edge is gradually arranged in an arc shape downward, and the outer shell block is arranged on the shell frame edge or the shell outer edge, or, the outer shell block is synchronously arranged on the shell frame edge and the shell outer edge; the shell outer edge is concave downward in an arc shape, and the outer shell block is concave downward in an arc shape, and the outer shell block and the outer plate are arranged in a flat and adsorbed manner.

[0010] Furthermore, the bottom shell has a shell frame edge, which is arranged to extend horizontally; the screen panel shell has a screen frame edge, which is arranged to extend horizontally; the outer shell block is embedded in the shell frame edge, and the outer surface of the outer shell block is flush with the outer surface of the shell frame edge; the outer plate block is embedded in the screen frame edge, and the outer surface of the outer plate block is flush with the outer surface of the screen frame edge; the outer plate block and the outer shell block are arranged to overlap and be adsorbed up and down.

[0011] Furthermore, the adsorption module includes two inner shell blocks and two inner plate blocks; the screen panel shell has an inner edge of the plate, the bottom shell has an inner edge of the shell, along the width direction, the inner edge of the plate and the outer edge of the plate are arranged correspondingly at both ends, the inner plate blocks are installed on the inner edge of the plate, the inner edge of the shell and the outer edge of the shell are arranged correspondingly at both ends, the inner shell block is installed on the inner edge of the shell, and the inner shell block and the inner plate blocks are arranged for adsorption.

[0012] Furthermore, the inner edge of the plate is arranged outwardly in an arched arc shape, the inner plate block is arranged outwardly in an arched arc shape, the inner edge of the shell is arranged outwardly in an arched arc shape, and the inner shell block is arranged outwardly in an arched arc shape; the inner plate block and the inner shell block are arranged to be flatly laid up and adsorbed.

[0013] Furthermore, the outer shell block and the outer plate are both magnetic blocks, and both have magnetic force; or, the outer shell block is a magnetic block and the outer plate is a metal block; or, the outer shell block is a metal block and the outer plate is a magnetic block.

[0014] Furthermore, the bottom shell has a bottom frame body, the bottom frame body has a bottom frame surface facing the screen panel shell, the bottom frame body is provided with a plurality of buffer columns, the buffer columns extend to be arranged above the bottom frame surface, the buffer columns are elastically arranged, and the buffer columns are compressed and contracted; the buffer force of the buffer columns is smaller than the adsorption force between the outer shell block and the outer plate block.

[0015] Furthermore, the soft layer includes a connecting piece, an inner baffle piece and an outer baffle piece, one end of the connecting piece is butt-jointed with the inner baffle piece and arranged as an integral unit, the other end of the connecting piece is butt-jointed with the bottom shell, the inner baffle piece is flatly laid on the inner end surface of the screen plate shell, the outer baffle piece is synchronously laid on the outer end surface of the screen plate shell and the outer end surface of the bottom shell, and the outer baffle piece and the connecting piece are arranged in an overlapping manner.

[0016] Compared with the prior art, the screen adsorption type protective case provided by the utility model can realize the folding and unfolding of the bottom shell and the screen panel shell under the action of the soft layer, and at the same time, the screen of the electronic device is protected by the screen panel shell; when in the folded state, the adsorption force on the screen panel shell is improved under the adsorption cooperation of the two outer shell blocks and the two outer plate blocks, thereby ensuring that the screen panel shell is in a covered state, avoiding the screen panel shell from being opened accidentally, and then ensuring the covering effect of the screen panel shell and the folding effect of the protective case. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an exploded schematic diagram of the screen adsorption type protective case provided by the utility model;

[0018] Figure 2 It is a plan view of the second embodiment of the screen adsorption type protective shell provided by the utility model;

[0019] Figure 3 It is a plan view of the third embodiment of the screen adsorption type protective shell provided by the utility model;

[0020] Figure 4 It is a schematic diagram of the exploded view of the third embodiment of the screen adsorption type protective shell provided by the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0023] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] Reference Figure 1-4 As shown, it is a preferred embodiment provided by the utility model.

[0025] A screen-adsorption protective case comprises a bottom shell 1, a screen plate shell 2, a soft layer 3 and an adsorption module 4, wherein two ends of the soft layer 3 are respectively arranged to be docked with the bottom shell 1 and the screen plate shell 2, the soft layer 3 is used for the bottom shell 1 and the screen plate shell 2 to be folded or unfolded, and the screen plate shell 2 is used to cover the screen of the electronic device; the adsorption module 4 comprises two outer shell blocks 41 and two outer plates 42, along the length direction of the screen plate shell 2, the two outer plates 42 are arranged correspondingly at both ends, and the outer plates 42 are installed on the screen plate shell 2, the outer shell block 41 is installed on the bottom shell 1, the two outer shell blocks 41 and the two outer plates 42 are in one-to-one correspondence and adsorption arrangement.

[0026] The above-mentioned screen adsorption type protective shell, under the action of the soft layer 3, realizes the folding and unfolding of the bottom shell 1 and the screen panel shell 2, and at the same time, protects the screen of the electronic device through the screen panel shell 2; when in the folded state, under the adsorption and cooperation of the two outer shell blocks 41 and the two outer plates 42, the adsorption force on the screen panel shell 2 is improved, thereby ensuring that the screen panel shell 2 is in a covered state, avoiding the screen panel shell 2 from being opened accidentally, and then ensuring the covering effect of the screen panel shell 2 and the folding effect of the protective shell.

[0027] The outer shell block 41 and the outer plate 42 are both magnetic blocks, and both the outer shell block 41 and the outer plate 42 have magnetic force, so as to achieve adsorption between the outer shell block 41 and the outer plate 42.

[0028] Alternatively, the outer shell block 41 is a magnetic block, and the outer plate 42 is a metal block, so as to achieve adsorption between the outer shell block 41 and the outer plate 42 .

[0029] Alternatively, the outer shell block 41 is a metal block, and the outer plate 42 is a magnetic block, so as to achieve adsorption between the outer shell block 41 and the outer plate 42 .

[0030] The bottom shell 1 has a bottom frame body, which has a bottom frame surface facing the screen panel shell 2. The bottom frame body is equipped with a plurality of buffer columns, which extend to the top of the bottom frame surface. The buffer columns are elastically arranged and contracted under pressure. The buffer force of the buffer columns is smaller than the adsorption force between the outer shell block 41 and the outer plate block 42.

[0031] In this way, when the screen panel shell 2 is unfolded and switched to folded, it first contacts the buffer column, and under the application of the adsorption force, overcomes the buffer force until the outer shell block 41 and the outer plate 42 are arranged in an adsorption manner; in this way, the adsorption force between the outer shell block 41 and the outer plate 42 is prevented from being too large, which causes the screen panel shell 2 to collide with the screen, thereby protecting the electronic device. At the same time, the covering of the screen panel shell 2 is gentler and reduces noise.

[0032] The buffer column includes a column shell and a spring. The lower part of the spring is fixed, and the upper part of the spring is connected to the column shell. The column shell is movably embedded in the bottom frame. In this way, the column shell is subjected to the downward pressure of the screen plate shell 2, compressing the spring, and playing a buffering role through the spring.

[0033] The soft layer 3 includes a connecting piece, an inner baffle piece and an outer baffle piece. One end of the connecting piece is connected to the inner baffle piece and is arranged as an integral unit. The other end of the connecting piece is connected to the bottom shell 1. The inner baffle piece is laid flat on the inner end surface of the screen plate shell 2. The outer baffle piece is synchronously laid on the outer end surface of the screen plate shell 2 and the outer end surface of the bottom shell 1. The outer baffle piece and the connecting piece are arranged in an overlapping manner.

[0034] In this way, with the cooperation of the outer baffle plate and the connecting plate, the bottom shell 1 and the screen panel shell 2 can be folded and unfolded; at the same time, with the cooperation of the connecting plate, the inner baffle plate and the outer baffle plate, the adsorption module 4 is shielded to prevent the adsorption module 4 from being exposed, thereby improving the user experience of the protective shell.

[0035] Embodiment 1:

[0036] Along the width direction, the screen panel shell 2 has a plate outer edge, which is arranged close to the outside, and the outer plate block 42 is installed on the plate outer edge. The bottom shell 1 has a shell outer edge, and the outer shell block 41 is installed on the shell outer edge. In this way, the adsorption force exerted by the outer plate 42 and the outer shell block 41 is close to the outside, thereby improving the adsorption stability of the screen panel shell 2, avoiding the screen panel shell 2 from being opened accidentally, and then ensuring the covering effect of the screen panel shell 2 and the folding effect of the protective shell.

[0037] The outer edge of the shell is concave downward in an arc shape, the outer shell block 41 is concave downward in an arc shape, the outer edge of the plate is arched downward in an arc shape, the outer plate 42 is arched downward in an arc shape, and the outer plate 42 and the outer shell block 41 are flatly arranged in adsorption.

[0038] In this way, due to the arc-shaped arrangement, the coverage of the outer shell block 41 and the outer plate block 42 is increased, so that adsorption force is applied to the corners of the protective shell, thereby ensuring the covering effect of the screen plate shell 2 and the folding effect of the protective shell.

[0039] The adsorption module 4 includes two inner shell blocks 43 and two inner plate blocks 44; the screen plate shell 2 has an inner edge of the plate, and the bottom shell 1 has an inner edge of the shell. Along the width direction, the inner edge of the plate and the outer edge of the plate are arranged correspondingly at both ends. The inner plate blocks 44 are installed on the inner edge of the plate, and the inner edge of the shell and the outer edge of the shell are arranged correspondingly at both ends. The inner shell block 43 is installed on the inner edge of the shell, and the inner shell block 43 and the inner plate blocks 44 are arranged for adsorption.

[0040] In this way, the inner shell block 43 and the inner plate 44 are adsorbed, and at the same time, the outer shell block 41 and the outer plate 42 are adsorbed to achieve four-corner adsorption, improve the adsorption stability of the screen plate shell 2, and effectively avoid the screen plate shell 2 from being opened by mistake.

[0041] The inner edge of the plate is arranged outward in an arched arc shape, the inner plate 44 is arranged outward in an arched arc shape, the inner edge of the shell is arranged outward in an arched arc shape, and the inner shell block 43 is arranged outward in an arched arc shape; the inner plate 44 and the inner shell block 43 are arranged to be flatly laid up and down and adsorbed.

[0042] In this way, the setting range of the inner shell block 43 and the setting range of the inner plate 44 are increased, thereby improving the adsorption stability of the inner plate 44 and the inner shell block 43.

[0043] Embodiment 2:

[0044] The bottom shell 1 has a shell frame edge and a shell outer edge. The shell frame edge is arranged horizontally, and the shell frame edge and the shell outer edge are butt-jointed. Along the direction away from the shell frame edge, the shell outer edge is gradually arranged in an arc shape downward, and the outer shell block 41 is arranged on the shell frame edge or the shell outer edge. In this way, the outer shell block 41 can be assembled at different positions, and the outer plate 42 can be installed accordingly to meet different adsorption requirements.

[0045] Alternatively, the outer shell block 41 is installed simultaneously on the edge of the shell frame and the outer edge of the shell; the setting range of the outer shell block 41 is increased, and the setting range of the outer plate block 42 is increased to improve the adsorption stability.

[0046] The outer edge of the shell is recessed downward in an arc shape, the outer shell block 41 is recessed downward in an arc shape, and the outer shell block 41 and the outer plate 42 are arranged flatly for adsorption; the setting range of the outer shell block 41 is increased, and the outer shell block 41 is set at the corner to ensure the adsorption effect on the screen plate shell 2.

[0047] The adsorption module 4 includes two inner shell blocks 43 and two inner plate blocks 44; the screen plate shell 2 has an inner edge of the plate, and the bottom shell 1 has an inner edge of the shell. Along the width direction, the inner edge of the plate and the outer edge of the plate are arranged correspondingly at both ends. The inner plate blocks 44 are installed on the inner edge of the plate, and the inner edge of the shell and the outer edge of the shell are arranged correspondingly at both ends. The inner shell block 43 is installed on the inner edge of the shell, and the inner shell block 43 and the inner plate blocks 44 are arranged for adsorption.

[0048] In this way, the inner shell block 43 and the inner plate 44 are adsorbed, and at the same time, the outer shell block 41 and the outer plate 42 are adsorbed to achieve four-corner adsorption, improve the adsorption stability of the screen plate shell 2, and effectively avoid the screen plate shell 2 from being opened by mistake.

[0049] The inner edge of the plate is arranged outward in an arched arc shape, the inner plate 44 is arranged outward in an arched arc shape, the inner edge of the shell is arranged outward in an arched arc shape, and the inner shell block 43 is arranged outward in an arched arc shape; the inner plate 44 and the inner shell block 43 are arranged to be flatly laid up and down and adsorbed.

[0050] In this way, the setting range of the inner shell block 43 and the setting range of the inner plate 44 are increased, thereby improving the adsorption stability of the inner plate 44 and the inner shell block 43.

[0051] Embodiment three:

[0052] The bottom shell 1 has a shell frame edge, which is arranged to extend horizontally; the screen plate shell 2 has a screen frame edge, which is arranged to extend horizontally; the outer shell block 41 is embedded in the shell frame edge, and the outer surface of the outer shell block 41 is arranged flush with the outer surface of the shell frame edge; the outer plate 42 is embedded in the screen frame edge, and the outer surface of the outer plate 42 is arranged flush with the outer surface of the screen frame edge; the outer plate 42 and the outer shell block 41 are arranged to overlap and be adsorbed.

[0053] In this way, the outer shell block 41 is set up through the edge of the shell frame, and the outer shell block 41 is embedded in the arrangement without protruding, and the outer shell block 42 is set up through the edge of the screen frame without protruding; in this way, when the outer plate 42 and the outer shell block 41 are adsorbed and arranged, it will not cause too large a gap when the bottom shell 1 and the screen plate shell 2 are folded, which is convenient for the adsorption of the bottom shell 1 and the screen plate shell 2.

[0054] The adsorption module 4 includes two inner shell blocks 43 and two inner plate blocks 44; the screen plate shell 2 has an inner edge of the plate, and the bottom shell 1 has an inner edge of the shell. Along the width direction, the inner edge of the plate and the outer edge of the plate are arranged correspondingly at both ends. The inner plate blocks 44 are installed on the inner edge of the plate, and the inner edge of the shell and the outer edge of the shell are arranged correspondingly at both ends. The inner shell block 43 is installed on the inner edge of the shell, and the inner shell block 43 and the inner plate blocks 44 are arranged for adsorption.

[0055] In this way, the inner shell block 43 and the inner plate 44 are adsorbed, and at the same time, the outer shell block 41 and the outer plate 42 are adsorbed to achieve four-corner adsorption, improve the adsorption stability of the screen plate shell 2, and effectively avoid the screen plate shell 2 from being opened by mistake.

[0056] The inner edge of the plate is arranged outward in an arched arc shape, the inner plate 44 is arranged outward in an arched arc shape, the inner edge of the shell is arranged outward in an arched arc shape, and the inner shell block 43 is arranged outward in an arched arc shape; the inner plate 44 and the inner shell block 43 are arranged to be flatly laid up and down and adsorbed.

[0057] In this way, the setting range of the inner shell block 43 and the setting range of the inner plate 44 are increased, thereby improving the adsorption stability of the inner plate 44 and the inner shell block 43.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Screen adsorption protective case, characterized in that: It includes a bottom shell, a screen shell, a soft layer and an adsorption module, the two ends of the soft layer are respectively connected to the bottom shell and the screen shell, the soft layer is used for the bottom shell and the screen shell to be folded or unfolded, and the screen shell is used to cover the screen of the electronic device; the adsorption module includes two outer shell blocks and two outer plate blocks, along the length direction of the screen shell, the two outer plate blocks are arranged correspondingly at both ends, and the outer plate blocks are installed on the screen shell, and the outer shell block is installed on the bottom shell, the two outer shell blocks and the two outer plate blocks are in one-to-one correspondence and adsorption arrangement.

2. The screen adsorption protective case according to claim 1, characterized in that: Along the width direction, the screen plate shell has a plate outer edge, the plate outer edge is arranged close to the outside, the outer plate block is arranged on the plate outer edge, the bottom shell has a shell outer edge, and the outer shell block is arranged on the shell outer edge.

3. The screen adsorption type protective case according to claim 2, characterized in that: The outer edge of the shell is concave downward in an arc shape, the outer shell block is concave downward in an arc shape, the outer edge of the plate is arched downward in an arc shape, the outer plate block is arched downward in an arc shape, and the outer plate block and the outer shell block are flatly arranged in adsorption.

4. The screen adsorption type protective case according to claim 1, characterized in that: The bottom shell has a shell frame edge and a shell outer edge, the shell frame edge is horizontally arranged, the shell frame edge and the shell outer edge are butt-arranged, and along the direction away from the shell frame edge, the shell outer edge is gradually arranged in an arc shape downward, the outer shell block is arranged on the shell frame edge or the shell outer edge, or, the outer shell block is synchronously arranged on the shell frame edge and the shell outer edge; the shell outer edge is concave downward in an arc shape, the outer shell block is concave downward in an arc shape, and the outer shell block and the outer plate are arranged in a flat and adsorbed manner.

5. The screen adsorption type protective case according to claim 1, characterized in that: The bottom shell has a shell frame edge, which is arranged to extend horizontally; the screen panel shell has a screen frame edge, which is arranged to extend horizontally; the outer shell block is embedded in the shell frame edge, and the outer surface of the outer shell block is flush with the outer surface of the shell frame edge; the outer plate block is embedded in the screen frame edge, and the outer surface of the outer plate block is flush with the outer surface of the screen frame edge; the outer plate block and the outer shell block are arranged to overlap and be adsorbed up and down.

6. The screen adsorption type protective case according to claim 2 or 3, characterized in that: The adsorption module includes two inner shell blocks and two inner plate blocks; the screen plate shell has an inner edge of the plate, the bottom shell has an inner edge of the shell, along the width direction, the inner edge of the plate and the outer edge of the plate are arranged correspondingly at both ends, the inner plate blocks are arranged on the inner edge of the plate, the inner edge of the shell and the outer edge of the shell are arranged correspondingly at both ends, the inner shell block is arranged on the inner edge of the shell, and the inner shell block and the inner plate blocks are arranged for adsorption.

7. The screen adsorption type protective case according to claim 6, characterized in that: The inner edge of the plate is arranged outwardly in an arched arc shape, the inner plate block is arranged outwardly in an arched arc shape, the inner edge of the shell is arranged outwardly in an arched arc shape, and the inner shell block is arranged outwardly in an arched arc shape; the inner plate block and the inner shell block are arranged to be flatly laid up and down and adsorbed.

8. The screen adsorption type protective case according to any one of claims 1 to 5, characterized in that: The outer shell block and the outer plate are both magnetic blocks, and both have magnetic force; or, the outer shell block is a magnetic block and the outer plate is a metal block; or, the outer shell block is a metal block and the outer plate is a magnetic block.

9. The screen adsorption type protective case according to any one of claims 1 to 5, characterized in that: The bottom shell has a bottom frame body, and the bottom frame body has a bottom frame surface facing the screen plate shell. The bottom frame body is equipped with a plurality of buffer columns, and the buffer columns are extended to the top of the bottom frame surface. The buffer columns are elastically arranged and are compressed and contracted; the buffer force of the buffer columns is smaller than the adsorption force between the outer shell block and the outer plate block.

10. The screen adsorption type protective case according to any one of claims 1 to 5, characterized in that: The soft layer includes a connecting piece, an inner baffle piece and an outer baffle piece. One end of the connecting piece is butted against the inner baffle piece and is arranged as an integral unit. The other end of the connecting piece is butted against the bottom shell. The inner baffle piece is laid flat on the inner end surface of the screen plate shell. The outer baffle piece is synchronously laid on the outer end surfaces of the screen plate shell and the bottom shell. The outer baffle piece and the connecting piece are arranged in an overlapping manner.

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