Electric bone cement stirrer

Abstract

The utility model provides an electric bone cement stirrer. The electric bone cement stirrer comprises a bottom container, a top upper cover, a supporting inner cover, a rotating bracket, stirring blades, a rotating wheel and a driving structure, the supporting inner cover is installed at the bottom of the top upper cover, the middle protrudes inwards to form an installation space, and an inner gear ring is formed on the bottom face of the installation space. The rotating support is rotatably mounted in the mounting space, the bottom of the rotating support is provided with a rotating shaft mounting cavity, and the rotating axis of the rotating shaft mounting cavity does not coincide with the rotating axis of the rotating support; the stirring blade is rotatably mounted in the rotating shaft mounting cavity through a blade rotating shaft, the rotating wheel is fixedly arranged on the blade rotating shaft, and outer teeth are matched and meshed with inner teeth of the inner gear ring; an output shaft of the driving structure is connected with the rotating support and used for driving the rotating support to rotate. When the electric bone cement stirrer disclosed by the utility model works, the driving structure drives the stirring blade to rotate, and the stirring blade simultaneously rotates around the axis of the stirring blade, so that the stirring efficiency and the stirring uniformity are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary instruments, and particularly relates to an electric bone cement mixer capable of continuously mixing bone cement. Background Art

[0002] Bone cement mixing devices are very commonly used in orthopedic surgeries. In orthopedic surgeries, bone cement is often filled into the gaps between artificial joints or bone tissues to play a role in stabilizing joint prostheses, reducing wear, and dispersing stress. Before filling, the bone cement needs to be fully stirred evenly inside the mixing device.

[0003] The bone cement raw material consists of two parts: a white powder and a colorless liquid preparation with a pungent odor. When in use, they need to be poured together and stirred in a certain proportion, and then a polymerization reaction can occur at room temperature. After the bone cement reacts to the dough stage and becomes a kneadable dough texture, it can be used for filling the affected area.

[0004] Currently, the common bone cement mixing devices on the market are a combination of a mixing bowl and a mixing spoon. The combination of the mixing bowl and the mixing spoon is manually stirred, with low stirring efficiency, poor uniformity, and the volatile gases generated after the reaction will be directly inhaled by the operator, but it has good convenience.

[0005] Therefore, how to design a mixer that can improve the stirring efficiency and uniformity and reduce the inhalation of volatile gases generated by stirring by the human body is a technical problem that has not been solved in the prior art. Summary of the Utility Model

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the technical defects that the combination of a mixing bowl and a mixing spoon in the prior art has low stirring efficiency, poor uniformity, and the volatile gases generated after the reaction are easily inhaled by the human body and are harmful to health when mixing bone cement, so as to provide an electric bone cement mixer that can improve the stirring efficiency and uniformity and reduce the inhalation of volatile gases generated by stirring by the human body.

[0007] To this end, the utility model provides an electric bone cement mixer, comprising:

[0008] A bottom container having an accommodation space with an upper opening;

[0009] A top cover that can be opened and closed and is covered at the upper opening position of the bottom container;

[0010] A support inner cover detachably connected to the bottom of the top cover, with a middle part protruding inward to form an installation space, and an internal gear ring formed on the bottom surface around the installation space;

[0011] A rotating bracket is rotatably installed in the installation space and has a rotating shaft installation cavity at the bottom. The rotation axis of the rotating shaft installation cavity does not coincide with the rotation axis of the rotating bracket.

[0012] A stirring blade has a blade rotating shaft, and the blade rotating shaft can be rotatably installed inside the rotating shaft installation cavity.

[0013] A runner is fixedly arranged on the blade rotating shaft, and the external teeth can be meshed with the internal teeth of the internal gear ring.

[0014] A driving structure is arranged inside the top cover and installed at the top of the installation space. The output shaft is connected to the rotating bracket and is used to drive the rotating bracket to rotate.

[0015] As a preferred technical solution, the middle part of the stirring blade is hollow.

[0016] As a preferred technical solution, the vertical side, bottom side of the stirring blade, and the arc side connecting the vertical side and the bottom side are consistent with the side wall, bottom wall of the bottom container, and the arc wall connecting the inner wall and the bottom wall.

[0017] As a preferred technical solution, the distance between the blade rotating shaft and the side wall of the bottom container is basically the same as half of the transverse length of the stirring blade.

[0018] As a preferred technical solution, the rotating bracket is rotatably installed with the inner wall of the installation space through a ball structure.

[0019] As a preferred technical solution, the upper opening position of the bottom container has a top outer flange, and the outer periphery of the support inner cover has a fastening outer ring that can be engaged with the top outer flange; the support inner cover is snap-connected to the top cover.

[0020] As a preferred technical solution, it further includes an internal support frame for supporting and fixing the driving structure, so that only the driving end of the driving structure is connected to the rotating bracket.

[0021] As a preferred technical solution, a battery installation opening is provided on the top cover.

[0022] The driving structure includes:

[0023] A battery is installed inside the battery installation opening.

[0024] A battery cover is detachably covered on the battery installation opening.

[0025] The motor is installed on the inner support frame and is connected to the battery through a wire. The output shaft is connected to the rotating bracket and is used to drive the rotating bracket to rotate.

[0026] The control board is arranged above the motor.

[0027] The push switch is installed on the top upper cover located above the motor.

[0028] The elastic member is installed between the push switch and the control board.

[0029] In the initial state, the push switch is in a convex state under the elastic force of the elastic member, and the circuit for supplying power to the motor is not connected, so the motor does not start working. When the push switch is pressed downward, the push switch moves downward after overcoming the elastic force of the elastic member to connect the circuit for supplying power to the motor, and the motor starts working.

[0030] As a preferred technical solution, the support inner cover is provided with a ventilation cylinder, and the top upper cover is provided with an exhaust nozzle. When the support inner cover and the top upper cover are docked and installed, the ventilation cylinder is matched and docked with the exhaust nozzle.

[0031] As a preferred technical solution, the support inner cover is provided with at least one positioning installation cylinder, and the top upper cover is provided with at least one positioning installation post. When the support inner cover and the top upper cover are docked and installed, the positioning installation post is inserted into the inside of the positioning installation cylinder to achieve positioning installation.

[0032] The technical solution provided by the present utility model has the following advantages:

[0033] 1. The electric bone cement mixer of the present utility model includes a bottom container, a top upper cover, a support inner cover, a rotating bracket, a mixing blade, a runner and a driving structure. The bottom container has an accommodating space, and the top upper cover is covered on the upper opening position of the bottom container. The support inner cover is detachably installed at the bottom of the top upper cover. The middle part of the support inner cover protrudes inwardly from the top upper cover to form an installation space, and an internal gear ring is formed on the bottom surface around the installation space. The rotating bracket is rotatably installed in the installation space, and has a shaft installation cavity at the bottom, and the rotation axis of the shaft installation cavity does not coincide with the rotation axis of the rotating bracket. The mixing blade is rotatably installed inside the shaft installation cavity through a blade shaft, the runner is fixedly arranged on the blade shaft, and the external teeth can be meshed with the internal teeth of the internal gear ring. The driving structure is arranged inside the top upper cover, installed at the top of the installation space, and the output shaft is connected to the rotating bracket and is used to drive the rotating bracket to rotate.

[0034] When using the electric bone cement mixer of the present utility model to mix bone cement, the raw materials are placed inside the bottom container. After covering the upper cover on the top, the driving structure is started. The driving structure drives the rotating bracket to rotate. The rotating bracket drives the mixing blades to rotate through the rotating shaft installation cavity and the blade rotating shaft. When the mixing blades rotate, the runner fixedly arranged on the blade rotating shaft meshes and drives with the internal gear ring. Since the internal gear ring is fixedly arranged, it will drive the mixing blades to rotate around the blade rotating shaft. In this way, when the driving structure drives the mixing blades to rotate, the mixing blades will also rotate around their own axes, thus greatly improving the mixing efficiency and the uniformity of mixing. Since the raw materials are mixed inside the internal space of the bottom container, the gas will not easily leak out.

[0035] 2. In the electric bone cement mixer of the present utility model, the middle part of the mixing blade is hollowed out, which is more likely to form the tumbling of the raw materials when mixing the bone cement, is more likely to mix the bone cement evenly, and can reduce the residue of the bone cement on the mixing blade.

[0036] 3. In the electric bone cement mixer of the present utility model, the vertical sides, bottom sides of the mixing blades, and the arc sides connecting the vertical sides and the bottom sides are consistent with the trends of the side walls, bottom walls of the bottom container, and the arc walls connecting the side walls and the bottom walls. When mixing, the mixing blades can stir up the raw materials from the bottom of the bottom container, avoiding the problem that the raw materials remain in the corners of the bottom container without being stirred up, resulting in poor mixing uniformity.

[0037] 4. In the electric bone cement mixer of the present utility model, the distance between the blade rotating shaft and the side wall of the bottom container is basically the same as half of the transverse length of the mixing blade. Such a setting can enable the mixing blades to stir up the raw materials falling on the bottom or side walls of the bottom container to the greatest extent, and the mixing is more thorough and uniform.

[0038] 5. The electric bone cement mixer of the present utility model further includes an internal support frame for supporting the driving structure, so that only the driving end of the driving structure is connected to the rotating bracket. Such a structural design can simplify the structural design of the installation space of the supporting inner cover and the position of the rotating bracket.

[0039] 6. The driving structure of the electric bone cement mixer of the present utility model includes a motor, a battery, a push switch, and an elastic member; in the initial state, the push switch protrudes outward under the elastic force of the elastic member, and the circuit for supplying power to the motor is not connected, and the motor does not work; when the above push switch is pressed downward by an external force, the push switch moves downward after overcoming the elastic force of the elastic member, connects the circuit for supplying power to the motor, and the motor starts to work. It drives the mixing blades to rotate through the rotating bracket to mix the bone cement; when the pressing of the push switch stops, the mixing will stop, which is very convenient.

[0040] 7. The electric bone cement mixer of the present utility model is provided with an air vent cylinder on the supporting inner cover and an exhaust nozzle on the top upper cover. When the supporting inner cover and the top upper cover are butt-jointed and installed, the air vent cylinder is matched and butted with the exhaust nozzle, and the gas generated by mixing the bone cement is discharged outward through the air vent cylinder and the exhaust nozzle. An exhaust gas collection device can be connected at the position of the exhaust nozzle to avoid inhalation by the human body; at least one positioning installation cylinder is provided on the supporting inner cover, and at least one positioning installation post is provided on the top upper cover. When the supporting inner cover and the top upper cover are butt-jointed and installed, the positioning installation post is inserted into the positioning installation cylinder to achieve positioning installation, thereby facilitating the positioning butt-joint of the air vent cylinder and the exhaust nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the prior art or the specific embodiments of the present utility model, the following briefly introduces the drawings used in the description of the prior art or the specific embodiments.

[0042] Figure 1 It is a schematic diagram of the overall structure of the electric bone cement mixer of the present utility model.

[0043] Figure 2 is Figure 1 sectional view of.

[0044] Figure 3 is Figure 1 another sectional view of.

[0045] Figure 4 is Figure 1 partial sectional view of.

[0046] Figure 5 is Figure 1 exploded structure diagram of.

[0047] Reference numerals in the drawings: 1, bottom container; 11, side wall, 12, bottom wall; 13, arc wall; 14, outer flange; 2, top upper cover; 3, supporting inner cover; 30, installation space; 31, snap-in outer ring; 4, internal gear ring; 5, rotating bracket; 51, rotating shaft installation cavity; 52, ball structure; 6, mixing blade; 61, blade rotating shaft; 62, vertical edge; 63, bottom edge; 64, arc edge; 65, runner; 7, internal support frame; 71, motor; 72, output shaft; 73, battery; 74, push switch; 81, installation positioning cylinder; 82, installation positioning post; 91, air vent cylinder; 92, exhaust nozzle; 93, battery installation port; 94, battery cover; 95, control board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] To enable those skilled in the art to better understand this solution, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of this application.

[0049] It should be noted that the terms "first", "second", etc. in the claims and the specification of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units clearly listed, but may also include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0050] In this application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. And, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this application can be understood according to specific circumstances. In addition, the meaning of the term "a plurality" should be two or more. It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0051] The following will detail this application with reference to the accompanying drawings and in conjunction with the embodiments. Embodiment

[0052] This embodiment provides an electric bone cement mixer, as Figure 1-4As shown, it includes a bottom container 1, a top cover 2, a supporting inner cover 3, a rotating bracket 5, stirring blades 6, a runner 65 and a driving structure. Among them, the bottom container 1 has an accommodating space with an upper opening. The top cover 2 is coverably arranged at the upper opening position of the bottom container 1. The supporting inner cover 3 is detachably connected to the bottom of the top cover 2, and a middle part bulges towards the inside of the top cover 2 to form an installation space 30, and an internal gear ring 4 is formed on the bottom surface around the installation space 30. The rotating bracket 5 is rotatably installed in the installation space 30, and has a rotating shaft installation cavity 51 at the bottom. The rotation axis of the rotating shaft installation cavity 51 does not coincide with the rotation axis of the rotating bracket 5. The stirring blade 6 has a blade rotating shaft 61, and the blade rotating shaft 61 can be rotatably installed inside the rotating shaft installation cavity 51. The runner 65 is fixedly arranged on the blade rotating shaft 61, and the external teeth can be meshed with the internal teeth of the internal gear ring 4. The driving structure is arranged inside the top cover 2, installed at the top of the installation space 30, and the output shaft is connected to the rotating bracket 5 for driving the rotating bracket 5 to rotate.

[0053] When using the electric bone cement mixer of this embodiment to mix bone cement, place the raw materials inside the bottom container 1. After covering the top cover 2, start the driving structure. The driving structure drives the rotating bracket 5 to rotate. The rotating bracket 5 drives the stirring blade 6 to rotate through the rotating shaft installation cavity 51 and the blade rotating shaft 61. When the stirring blade 6 rotates, the runner 65 fixedly arranged on the blade rotating shaft 61 meshes and drives with the internal gear ring 4. Since the internal gear ring 4 is fixedly arranged, it will drive the stirring blade 6 to rotate around the blade rotating shaft 61. In this way, when the driving structure drives the stirring blade 6 to rotate, the stirring blade 6 will also rotate around its own axis, thus greatly improving the mixing efficiency and the uniformity of mixing. Since the raw materials are mixed inside the internal space of the bottom container 1, the gas will not easily leak out.

[0054] In this embodiment, the middle part of the stirring blade 6 is hollowed out. When mixing bone cement, the hollowed-out stirring blade 6 is prone to form the tumbling of the raw materials, making it easier to mix the bone cement evenly and reducing the residue of the bone cement on the stirring blade 6.

[0055] Furthermore, the vertical sides 62, bottom sides 63 of the stirring blade 6 and the arc sides 64 connecting the vertical sides 62 and the bottom sides 63 are in the same direction as the side wall 11, bottom wall 12 of the bottom container 1 and the arc wall 13 connecting the inner wall 11 and the bottom wall 12. When mixing, the stirring blade 6 can stir up the raw materials from the bottom of the bottom container 1, avoiding the problem that the raw materials remain in the corners of the bottom container 1 without being stirred up, resulting in poor mixing uniformity.

[0056] In this embodiment, the distance between the blade shaft 61 and the side wall 11 of the bottom container 1 is substantially the same as half of the transverse length of the stirring blade 6. This arrangement enables the stirring blade 6 to stir up the raw materials that fall on the bottom or side wall of the bottom container 1 to the greatest extent, making the stirring more thorough and uniform.

[0057] The rotating bracket 5 is rotatably installed with the inner wall of the installation space 30 through a ball structure 52; the upper opening position of the bottom container 1 has a top outer flange 14, and the outer periphery of the supporting inner cover 3 has a snap-fitting outer ring 31 that can cooperate with the top outer flange 14; the supporting inner cover 3 is snap-fitted and connected with the top upper cover 2.

[0058] The internal support frame 7 is used to support the fixed driving structure, so that only the driving end of the driving structure is connected to the rotating bracket 5. Such a structural design can simplify the structural design of the installation space 330 supporting the inner cover 3 and the position of the rotating bracket 5.

[0059] In this embodiment, a battery installation port 93 is provided on the top cover 2; the driving structure includes: a battery 73, a battery cover 94, a motor 71, a control board 95, a push switch 74 and an elastic member (not shown in the figure); wherein the battery 73 is installed inside the battery installation port 93; the battery cover 94 is detachably covered on the battery installation port 93; the motor 71 is installed on the internal support frame 7, connected to the battery 73 through a wire, and the output shaft 72 is connected to the rotating bracket 5 for driving the rotating bracket 5 to rotate; the control board 95 is arranged above the motor 71, and the push switch 74 is installed on the top cover 1 located above the motor 71; the elastic member is installed between the push switch 74 and the control board 95.

[0060] In the initial state, the push switch 74 is in a convex state under the elastic force of the elastic member, and the circuit for powering the motor 71 is not connected, and the motor 71 does not start to work; when the push switch 74 is pressed downward, the push switch 74 overcomes the elastic force of the elastic member and moves downward to connect the circuit for powering the motor 71, and the motor 71 starts to work. The motor 71 drives the stirring blade 6 to rotate by rotating the bracket 5, and the stirring speed is controllable, which can solve the problems of low stirring efficiency, time-consuming and labor-intensive, and poor stirring uniformity of the manual bone cement stirrer in the prior art.

[0061] Preferably, the support inner cover 3 is provided with a vent 91, and the top upper cover 2 is provided with an exhaust nozzle 92. When the support inner cover 3 is docked with the top upper cover 2, the vent 91 is docked with the exhaust nozzle 92. The volatile irritating gas generated by the bone cement during mixing can be connected to the negative pressure device through the exhaust hole to be evacuated at any time. It is highly safe, compact and easy to move at any time.

[0062] In addition, at least one positioning and installation cylinder 81 is provided on the supporting inner cover 3, and at least one positioning and installation post 82 is provided on the top upper cover 2. When the supporting inner cover 3 is docked and installed with the top upper cover 2, the positioning and installation post 82 is inserted into the positioning and installation cylinder 81 to achieve positioning and installation, thereby facilitating the positioning and docking of the ventilation cylinder and the exhaust nozzle.

[0063] The working process of the electric bone cement mixer in this embodiment is as follows: Place the raw materials inside the bottom container 1. After covering the top upper cover 2, press down the above-mentioned push button switch 74. The battery 73 powers the motor 71, and the motor 71 starts to drive the rotating bracket 5 to rotate. The rotating bracket 5 drives the stirring blade 6 to rotate through the rotating shaft installation cavity 51 and the blade rotating shaft 61. When the stirring blade 6 rotates, the runner 65 fixedly arranged on the blade rotating shaft 61 meshes with the internal gear ring 4 for transmission. Since the internal gear ring 4 is fixedly arranged, it will drive the stirring blade 6 to rotate around the blade rotating shaft 61 in the reverse direction. The rotating stirring blade 6 stirs the bone cement raw materials placed in the bottom container 1 evenly; the irritating gas generated during the stirring process is discharged outward through the ventilation cylinder 91 and the exhaust nozzle 92 to the waste gas collection device to prevent the human body from inhaling.

[0064] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of this innovative technical solution.

Claims

1. An electric bone cement mixer, characterized in that, Comprising: A bottom container (1) having an accommodation space with an upper opening; A top cover (2) that can be opened and closed and is provided at the upper opening position of the bottom container (1); A support inner cover (3) detachably connected to the bottom of the top cover (2), with a middle part protruding inwardly into the interior of the top cover (2) to form an installation space (30), and an internal gear ring (4) formed on the bottom surface around the installation space (30); A rotating bracket (5) rotatably installed in the installation space (30), having a rotating shaft installation cavity (51) at the bottom, and the rotation axis of the rotating shaft installation cavity (51) does not coincide with the rotation axis of the rotating bracket (5); A stirring blade (6) having a blade rotating shaft (61), and the blade rotating shaft (61) can be rotatably installed inside the rotating shaft installation cavity (51); A runner (65) fixedly provided on the blade rotating shaft (61), and the external teeth can be meshed with the internal teeth of the internal gear ring (4); A driving structure provided inside the top cover (2), installed at the top of the installation space (30), with an output shaft connected to the rotating bracket (5) for driving the rotating bracket (5) to rotate.

2. The electric bone cement mixer according to claim 1, characterized in that: The middle part of the stirring blade (6) is hollow.

3. The electric bone cement mixer according to claim 2, characterized in that: The vertical side (62), bottom side (63) of the stirring blade (6), and the arc side (64) connecting the vertical side (62) and the bottom side (63) are in the same direction as the side wall (11), bottom wall (12) of the bottom container (1), and the arc wall (13) connecting the side wall (11) and the bottom wall (12).

4. The electric bone cement mixer according to claim 3, characterized in that: The distance between the blade rotating shaft (61) and the side wall (11) of the bottom container (1) is basically the same as half of the transverse length of the stirring blade (6).

5. The electric bone cement mixer according to claim 1, characterized in that: The rotating bracket (5) is rotatably installed on the inner wall of the installation space (30) through a ball structure (52).

6. The electric bone cement mixer according to claim 1, wherein: The upper opening position of the bottom container (1) has a top outer flange (14), and the outer periphery of the support inner cover (3) has a snap - fit outer ring (31) that can cooperate and be snap - connected with the top outer flange (14); the support inner cover (3) is snap - connected to the top cover (2).

7. The electric bone cement mixer according to claim 1, wherein: It further includes an internal support frame (7) for supporting and fixing the driving structure, such that only the driving end of the driving structure is connected to the rotating bracket (5).

8. The electric bone cement mixer according to claim 7, characterized in that: The top cover (2) is provided with a battery installation opening (93); The driving structure includes: A battery (73) installed inside the battery installation opening (93); A battery cover (94) detachably covering the battery installation opening (93); A motor (71) installed on the internal support frame (7), connected to the battery (73) through a wire, and the output shaft (72) is connected to the rotating bracket (5) for driving the rotating bracket (5) to rotate; A control board (95) provided above the motor (71); A push - button switch (74) installed on the top cover (2) above the motor (71); An elastic member is installed between the push switch (74) and the control board (95); In the initial state, the push switch (74) is in a convex state under the elastic force of the elastic member, and the circuit for supplying power to the motor (71) is not connected, so the motor (71) does not start working; when the push switch (74) is pressed downwards, the push switch (74) moves downwards after overcoming the elastic force of the elastic member to connect the circuit for supplying power to the motor (71), and the motor (71) starts working.

9. The electric bone cement mixer according to claim 1, characterized in that: An air vent cylinder (91) is provided on the support inner cover (3), and an exhaust nozzle (92) is provided on the top upper cover (2). When the support inner cover (3) is docked and installed with the top upper cover (2), the air vent cylinder (91) is matched and docked with the exhaust nozzle (92).

10. The electric bone cement mixer according to claim 9, characterized in that, At least one positioning installation cylinder (81) is provided on the support inner cover (3), and at least one positioning installation post (82) is provided on the top upper cover (2). When the support inner cover (3) is docked and installed with the top upper cover (2), the positioning installation post (82) is inserted into the positioning installation cylinder (81) to achieve positioning installation.

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