Cover plate mechanism and power electronics

Abstract

The utility model relates to a kind of cover plate mechanism and power electronics equipment, wherein the cover plate mechanism includes bottom plate, the cylindrical shaft being set on the bottom plate, the cover plate being rotatably connected with the cylindrical shaft, the cover plate is switched between the position of sticking bottom plate and the position of moving away from bottom plate. The cylindrical shaft one end is equipped with limit slot and the arc-shaped slot being communicated with the limit slot. The connecting place of the limit slot and the arc-shaped slot is equipped with obstruction. The limit block is equipped on the cover plate, and the limit block slides in the limit slot and the arc-shaped slot. The limit block slides in the arc-shaped slot towards the limit slot direction, the limit block passes the obstruction and is clamped into the limit slot, and the cover plate is rotated to the position of moving away from bottom plate by rotating the cover plate towards the position of moving away from bottom plate. The utility model is equipped with the limit slot and the arc-shaped slot being communicated, reduces the probability of limit block damage, and the volume of entire cover plate mechanism can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of electromechanical engineering, and in particular to a cover plate mechanism and a power electronic device. Background Technology

[0002] In the current industrial control field, control panels on power electronic devices are usually required to be covered to prevent foreign objects from entering the control panel area and to protect the keyboard and circuits from damage.

[0003] In existing cover plate mechanisms, there is usually a rotating shaft and a cover plate that rotates along the rotating shaft. For example, Chinese utility model patent CN208521556U "A mechanism for driving the flip cover rotation of an LED display screen" includes a first stop groove and a second stop groove set on the side wall of the rotating shaft column. The depth of the second stop groove is greater than that of the first stop groove. The rotating cavity of the flip cover is provided with a stop post. The flip cover can be locked at different angles by switching between stop grooves of different depths through the stop post.

[0004] However, the axis of rotation of the flip cover around the pivot column in CN208521556U is not in the same straight line as the axis of the pivot column itself. This results in two defects in CN208521556U: First, when the stop post is not in the stop groove, it is exposed and easily damaged. Once the stop post is damaged, the flip cover rotation mechanism of CN208521556U has no locking function. Second, because the axis of rotation of the flip cover around the pivot column is not in the same straight line as the axis of the pivot column itself, the overall size of the flip cover rotation mechanism of CN208521556U is relatively large. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model discloses a cover plate mechanism and a power electronic device, which has a compact structure and the limiting block is not easily damaged.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A cover plate mechanism includes a base plate, a columnar shaft disposed on the base plate, and a cover plate rotatably connected to the columnar shaft. Rotating the cover plate allows it to switch between a position close to the base plate and a position away from the base plate. One end of the columnar shaft is provided with a limiting groove and an arc-shaped groove communicating with the limiting groove. An obstruction is provided at the connection between the limiting groove and the arc-shaped groove. A limiting block is provided on the cover plate, sliding within the limiting groove and the arc-shaped groove. Rotating the cover plate towards the position away from the base plate causes the limiting block to slide within the arc-shaped groove towards the limiting groove. The limiting block then passes the obstruction and engages in the limiting groove, at which point the cover plate rotates to the position away from the base plate.

[0008] Furthermore, both the arc-shaped groove and the limiting groove are located at the edge of one end of the cylindrical shaft.

[0009] Furthermore, the cover plate includes a plate body and a rotating block connected to the plate body, the rotating block being located at the end of the columnar shaft; the end of the columnar shaft is provided with a protrusion, the rotating block is provided with a groove that mates with the protrusion and an opening groove that communicates with the groove, the limiting block, the opening of the groove and the opening groove are all located on the first surface of the rotating block, the surface of the rotating block adjacent to the first surface is the second surface, and the opening groove extends to the second surface; the protrusion enters the groove through the opening groove.

[0010] Furthermore, the protrusion is columnar, the radial cross-section of the protrusion is racetrack-shaped, the length of the long side of the protrusion is greater than the width of the opening groove, and the length of the short side of the protrusion is less than the width of the opening groove; the short side of the protrusion is oriented towards the opening groove, driving the protrusion to enter the groove through the opening groove.

[0011] Furthermore, as the protrusion enters the groove through the opening slot, the limiting block simultaneously enters the limiting groove.

[0012] Furthermore, the base plate is provided with a connecting block located away from the columnar axis, the connecting block is provided with a flange, and the cover plate is provided with a fixing groove that mates with the flange, the flange being oriented towards the columnar axis; when the cover plate is located at the position of fitting the base plate, the flange enters the fixing groove.

[0013] Furthermore, the cover plate is provided with a recessed portion for accommodating the connecting block, and the fixing groove is disposed in the recessed portion; when the cover plate is located in the position of fitting the bottom plate, the connecting block enters the recessed portion.

[0014] Furthermore, the plate is provided with a gripping part that extends beyond the edge of the plate.

[0015] Furthermore, the cover plate is provided with a guide slope; the cover plate rotates toward the position of the mating base plate, the cover plate undergoes elastic deformation and the flange abuts against the cover plate, the flange slides on the guide slope until the flange enters the fixing groove.

[0016] A power electronic device includes a control panel and any of the cover mechanisms described above; when the cover is located in the position of adhering to the base plate, the cover shields the control panel; when the cover is located in the position away from the base plate, the cover is away from the control panel.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting interconnected limiting grooves and arc-shaped grooves, the limiting block always slides within the grooves, greatly reducing the possibility of damage to the limiting block. Furthermore, since both the limiting grooves and arc-shaped grooves are located at the ends of the columnar shaft, the cover plate can be designed as a structure that rotates around the columnar shaft, reducing the overall volume of the cover plate mechanism. Attached Figure Description

[0018] Figure 1 This is a first structural schematic diagram of an electronic power device using a cover plate mechanism in this utility model;

[0019] Figure 2 This is a second structural schematic diagram of the electronic power equipment using the cover plate mechanism in this utility model;

[0020] Figure 3 yes Figure 2 Enlarged diagram of section A in the middle;

[0021] Figure 4 This is a schematic diagram of the third structure of the electronic power equipment using the cover plate mechanism in this utility model;

[0022] Figure 5 yes Figure 4 Enlarged diagram of section B;

[0023] Figure 6 This is a top view of the electronic power equipment using the cover plate mechanism in this utility model;

[0024] Figure 7 yes Figure 6 A sectional view of section C-C;

[0025] Figure 8 yes Figure 7 Enlarged schematic diagram of section D in the middle;

[0026] Figure 9 This is a schematic diagram of the fourth structure of the electronic power equipment using the cover plate mechanism in this utility model;

[0027] Figure 10 yes Figure 9 Enlarged schematic diagram of section E in the middle;

[0028] Figure 11 This is a schematic diagram of the structure of the cover plate of this utility model;

[0029] Figure 12 yes Figure 11 Enlarged schematic diagram of section F in the middle;

[0030] Figure 13 yes Figure 6 A sectional view of section G-G;

[0031] Figure 14 yes Figure 13 Enlarged schematic diagram of section H in the middle.

[0032] In the picture:

[0033] 1 – Base plate; 2 – Columnar shaft; 3 – Cover plate; 3a – Plate body; 3b – Rotating block; 4 – Limiting groove; 5 – Arc groove; 6 – Limiting block; 7 – Protrusion; 8 – Groove; 9 – Opening groove; 10 – Connecting block; 11 – Flange; 12 – Fixing groove; 13 – Guide slope; 14 – Grip part; 15 – Control panel. Detailed Implementation

[0034] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] This utility model discloses a cover plate mechanism, such as Figures 1 to 8As shown. The cover plate mechanism consists of a base plate 1, a columnar shaft 2 mounted on the base plate 1, and a cover plate 3 rotatably connected to the columnar shaft 2. Rotating the cover plate 3 allows it to switch between a position flush with the base plate and a position away from the base plate. One end of the columnar shaft 2 has a limiting groove 4 and an arc-shaped groove 5 communicating with the limiting groove 4. An obstruction is provided at the connection between the limiting groove 4 and the arc-shaped groove 5. The cover plate 3 has a limiting block 6, which slides within the limiting groove 4 and the arc-shaped groove 5.

[0038] The purpose of the obstruction is to prevent the limiting block 6 from sliding freely between the limiting groove 4 and the arc-shaped groove 5. When the limiting block 6 needs to slide from the limiting groove 4 into the arc-shaped groove 5, a greater external force than that required for the limiting block 6 to slide in the limiting groove 4 is needed to allow the limiting block 6 to pass over the obstruction and enter the limiting groove 4. During this process, the limiting block 6 and / or the obstruction undergo elastic deformation. The shape of the obstruction can be various; in some embodiments, such as... Figure 8 As shown, the obstruction can be a protrusion of the limiting block 6 in the movement path along the arc-shaped groove 5 to the limiting groove 4. In other embodiments, a stepped surface can also be provided between the limiting groove 4 and the arc-shaped groove 5, and the obstruction is the step between the limiting groove 4 and the arc-shaped groove 5.

[0039] like Figures 6 to 8 As shown, at this time, the cover plate 3 is in the position of fitting against the bottom plate, while the limiting block 6 is located at the end of the arc-shaped groove 5 away from the limiting groove 4. Rotating the cover plate 3 towards the position away from the bottom plate causes the limiting block 6 to slide within the arc-shaped groove 5 towards the limiting groove 4. When the limiting block 6 moves to the connection point between the limiting groove 4 and the arc-shaped groove 5, due to the obstruction, a force greater than that required to drive the limiting block 6 to slide within the arc-shaped groove 5 is needed for the limiting block 6 to pass over the obstruction and engage in the limiting groove 4. During the process of the limiting block 6 passing over the obstruction, the obstruction and / or the limiting block 6 undergo elastic deformation. When the limiting block 6 engages in the limiting groove 4, due to the presence of the obstruction, the limiting block 6 is not easily dislodged from the limiting groove 4, and at this time, the cover plate 3 is located away from the bottom plate.

[0040] The cover plate mechanism of this utility model can exist in two states. In the first state, the cover plate 3 rotates around the axis of the cylindrical shaft 2. In this state, both the arc-shaped groove 5 and the limiting groove 4 are arranged around the axis of the cylindrical shaft 2. In this structure, the cover plate 3 and the cylindrical shaft 2 fit tightly together, resulting in a compact structure and small volume. In the second state, the cover plate 3 does not rotate around the axis of the cylindrical shaft 2; that is, the axis of rotation of the cover plate 3 is not on the same straight line as the axis of the cylindrical shaft 2. In this state, the arc-shaped groove 5 and the limiting groove 4 are not arranged around the axis of the cylindrical shaft 2. In this structure, when the cover plate 3 is in the position of fitting the base plate, the gap between it and the cylindrical shaft 2 is larger, resulting in a larger overall volume of the cover plate mechanism.

[0041] This invention, by setting interconnected limiting grooves 4 and arc-shaped grooves 5, ensures that the limiting block 6 always slides within the grooves, preventing the limiting block 6 from being exposed and greatly reducing the possibility of damage to the limiting block 6. Furthermore, since both the limiting groove 4 and the arc-shaped groove 5 are located at the end of the columnar shaft 2, the cover plate 3 can be designed to rotate around the columnar shaft, reducing the overall volume of the cover plate mechanism.

[0042] In the cover plate mechanism of this utility model, many technical features, such as the position of the limiting groove 4 and the position of the arc-shaped groove 5, have multiple implementations. Below, for each of these technical features, including the position of the limiting groove 4, one implementation will be selected for detailed description. The embodiment in which this implementation is located is referred to as this embodiment. Other implementations of the limiting groove 4 and other features are referred to as other embodiments, which will be briefly described below.

[0043] In this embodiment, as Figure 4 and Figure 5 As shown, both the limiting groove 4 and the arc-shaped groove 5 are located at the edge of one end of the cylindrical shaft 2. This invention, by placing the limiting groove 4 and the arc-shaped groove 5 at the edge of one end of the cylindrical shaft 2, means that both extend from one end of the cylindrical shaft 2 to the side wall of the cylindrical shaft 2, effectively creating a notch between the end face and the side wall of the cylindrical shaft 2. When the cover plate 3 needs to be assembled onto the cylindrical shaft 2, the limiting block 6 can easily enter the limiting groove 4 or the arc-shaped groove 5 because the limiting groove 4 and the arc-shaped groove 5 extend to the side wall of the cylindrical shaft 2. This facilitates the assembly between the cylindrical shaft 2 and the cover plate 3. In other embodiments, the limiting groove 4 and the arc-shaped groove 5 may not extend to the side wall of the cylindrical shaft 2, but in this case, the limiting block 6 needs to be elastic to be able to engage with the limiting groove 4 or the arc-shaped groove 5 during the assembly between the cylindrical shaft 2 and the cover plate 3.

[0044] In this embodiment, as Figures 2 to 5As shown, the cover plate 3 includes a plate 3a and a rotating block 3b connected to the plate 3a. The plate 3a and the rotating block 3b are integrally formed. Two rotating blocks 3b are cylindrical, located at opposite ends of the cylindrical shaft 2. A protrusion 7 is provided at the end of the cylindrical shaft 2. The rotating block 3b has a groove 8 that mates with the protrusion 7 and an opening groove 9 that communicates with the groove 8. The openings of the limiting block 6, the groove 8, and the opening groove 9 are all located on the first surface of the rotating block 3b, which is the cylindrical end face of the rotating block 3b. The surface of the rotating block 3b adjacent to the first surface is the second surface, i.e., the surface where the cylindrical rotating block 3b's sidewall is located. The opening groove 9 extends to the second surface, and the protrusion 7 enters the groove 8 through the opening groove 9. Therefore, during the assembly of the rotating block 3b to both ends of the cylindrical shaft 2, the protrusion 7 can enter the groove 8 through the opening groove 9. This invention, through the design of the opening slot 9, facilitates the assembly of the rotating block 3b and the cylindrical shaft 2. In other embodiments, the rotating block 3b can be spliced ​​to the plate 3a. During the assembly of the rotating block 3b to both ends of the cylindrical shaft 2, the rotating block 3b can be installed separately to both ends of the cylindrical shaft 2 before the plate 3a is spliced ​​to the rotating block 3b. Therefore, the opening slot 9 is unnecessary, and the rotating block 3b will not deform during installation. In other embodiments, the protrusion 7 can also be provided on the rotating block 3b, while the groove 8 is provided at the end of the cylindrical shaft 2.

[0045] In this embodiment, as Figures 2 to 5 As shown, the protrusion 7 is cylindrical, and its radial cross-section is racetrack-shaped. The protrusion 7 has a long side and a short side, as shown... Figure 5 As shown, in the racetrack-shaped cross-section of protrusion 7, the distance between the bottoms of the two arc-shaped openings on the two arc-shaped sides is defined as the long side of protrusion 7. In the racetrack-shaped cross-section of protrusion 7, the distance between two parallel straight lines at the edge of the cross-section is defined as the short side of protrusion 7. The length of the long side of protrusion 7 is set to be greater than the width of the opening groove 9, that is, the length of protrusion 7 in the longitudinal direction is greater than the width of the opening groove 9. The length of the short side of protrusion 7 is less than the width of the opening groove 9, that is, the length of protrusion 7 in the angular direction is less than the width of the opening groove 9. Therefore, when protrusion 7 needs to be assembled into groove 8, the operator faces the short side of protrusion 7 toward opening groove 9, driving protrusion 7 to enter groove 8 through opening groove 9. By limiting the dimensions of protrusion 7 and opening groove 9, this utility model makes it difficult for protrusion 7 to fall out of groove 8 through opening groove 9 during the rotation of groove 8, and facilitates the assembly of rotating block 3b with columnar shaft 2. During the assembly of cover plate 3 to columnar shaft 2, rotating block 3b does not deform. In other embodiments, the protrusion 7 may be cylindrical, and the width of the opening groove 9 may be smaller than the diameter of the radial cross-section of the protrusion 7. Therefore, when the protrusion 7 enters the groove 8, after the rotating block 3b undergoes elastic deformation, the protrusion 7 is engaged in the groove 8 through the opening groove 9.

[0046] In this embodiment, as Figures 2 to 5 As shown, during the process of the protrusion 7 entering the groove 8 through the opening groove 9, the limiting block 6 simultaneously enters the limiting groove 4. That is, when the protrusion 7 enters the groove 8, the limiting block 6 also enters the limiting groove 4. Therefore, when the cover plate 3 is installed on the columnar shaft 2, the cover plate 3 is in a position away from the bottom plate, and at this time the limiting block 6 is stuck in the limiting groove 4. Therefore, even if the short side of the protrusion 7 faces the opening groove 9, the cover plate 3 is not easily separated from the columnar shaft 2. When it is necessary to remove the cover plate 3 from the columnar shaft 2, rotate the cover plate 3 to a position away from the bottom plate, and use a little force to remove the limiting block 6 from the limiting groove 4. In other embodiments, when the protrusion 7 is cylindrical, the limiting block 6 can also simultaneously enter the arc-shaped groove 5 during the process of the protrusion 7 entering the groove 8 through the opening groove 9. At this time, the cover plate 3 and the columnar shaft 2 are also not easily separated, but the installation difficulty between the cover plate 3 and the columnar shaft 2 is greater than in this embodiment.

[0047] In this embodiment, as Figure 6 , Figures 9 to 14 As shown, the base plate 1 has a connecting block 10 positioned away from the columnar axis 2, and the connecting block 10 has a flange 11. The cover plate 3 has a fixing groove 12 that mates with the flange 11. Specifically, the fixing groove 12 is located on the plate body 3a. The flange 11 faces the columnar axis 2. When the cover plate 3 is rotated to a position that fits against the base plate, i.e., during the closing process of the cover plate 3, the cover plate 3 undergoes a slight elastic deformation, and the flange 11 engages in the fixing groove 12. Figure 6 As shown, the cover plate 3 is currently in the position of being flush with the base plate. If it is necessary to rotate the cover plate 3 from the position flush with the base plate to a position away from the base plate, i.e., to open the cover plate 3, the operator needs to apply slight force to disengage the flange 11 from the fixing groove 12. This invention, through the arrangement of the flange 11 and the fixing groove 12, makes it difficult for the cover plate 3 to be accidentally opened. In other embodiments, magnetic blocks can also be provided on both the base plate 1 and the cover plate 3; the attraction force of the magnetic blocks will further prevent the cover plate 3 from being accidentally opened.

[0048] In this embodiment, as Figure 1 , Figure 11 and Figure 12 As shown, the cover plate 3 has a recessed portion for accommodating the connecting block 10, that is, the plate body 3a has a recessed portion for accommodating the connecting block 10, and the fixing groove 12 is disposed in the recessed portion. When the cover plate 3 is in the position of fitting the bottom plate, the connecting block 10 enters the recessed portion. This utility model improves the overall aesthetics of the cover plate mechanism by setting the recessed portion, while avoiding the operator accidentally touching the connecting block 10 during the opening of the cover plate 3, thus preventing inconvenience in opening. In other embodiments, the flange 11 can also be disposed on the side of the connecting block 10 away from the columnar shaft 2. Therefore, when the cover plate 3 is in the position of fitting the bottom plate, the cover plate 3 completely covers the connecting block 10, which can also improve the aesthetics of the cover plate mechanism and facilitate the opening of the cover plate 3.

[0049] In this embodiment, as Figures 11 to 14 As shown, the cover plate 3 is provided with a guide slope 13, that is, the plate body 3a is provided with a guide slope 13. When the cover plate 3 rotates toward the position to be in contact with the bottom plate, the cover plate 3 undergoes elastic deformation and the flange 11 abuts against the cover plate 3. The flange 11 slides on the guide slope 13 until the flange 11 enters the fixing groove 12. Since the cover plate 3 undergoes elastic deformation during the process of the flange 11 entering the fixing groove 12, the present invention facilitates the entry of the flange 11 into the fixing groove 12 by setting the guide slope 13. In other embodiments, the flange 11 can be set as a rubber part. During the process of the cover plate 3 rotating toward the position to be in contact with the bottom plate, since the flange 11 has good elasticity, the guide slope 13 may not be provided.

[0050] In this embodiment, as Figure 2 , Figure 11 and Figure 13 As shown, the plate 3a is provided with a gripping part 14, which extends beyond the edge of the plate 3a. When it is necessary to open the cover plate 3, that is, to rotate the cover plate 3 from the position attached to the bottom plate to the position away from the bottom plate, the operator can rotate the plate 3a by using the gripping part 14. The same applies when it is necessary to close the cover plate 3. This utility model facilitates the operator to rotate the cover plate 3 by providing the gripping part 14. In other embodiments, a handle for easy gripping can be provided on the cover plate plane of the cover plate 3.

[0051] This utility model also discloses an electronic power device, which can be a frequency converter. For example... Figure 2 , Figure 4 and Figure 9 As shown. The electronic power equipment of this utility model includes a control panel 15 and a cover plate mechanism of this utility model. The base plate 1 has an opening area for fixing the control panel 15, and the cover plate 3 is made of a semi-transparent material. When the cover plate 3 is in the position of being in contact with the base plate, the cover plate 3 covers the control panel 15. When the cover plate 3 is in the position away from the base plate, the cover plate 3 is away from the control panel 15. Therefore, when the cover plate mechanism of this utility model is used in electronic power equipment, the cover plate 3 can protect the control panel 15, and when it is necessary to operate the control panel 15, the cover plate 3 can be quickly opened.

[0052] In summary, the cover plate mechanism of this utility model, through the limiting groove 4 and the arc-shaped groove 5, greatly reduces the possibility of damage to the limiting block 6 and reduces the overall volume of the cover plate mechanism. Furthermore, by positioning both the limiting groove 4 and the arc-shaped groove 5 at the edge of one end of the columnar shaft 2, the assembly between the columnar shaft 2 and the cover plate 3 is facilitated. The opening groove 9 further simplifies the assembly between the rotating block 3b and the columnar shaft 2. By limiting the dimensions of the protrusion 7 and the opening groove 9, the protrusion 7 is less likely to detach from the groove 8 through the opening groove 9. And by ensuring that the limiting block 6 simultaneously enters the limiting groove 4 as the protrusion 7 enters the groove 8 through the opening groove 9, the connection between the cover plate 3 and the columnar shaft 2 is stable. The arc-shaped block facilitates the entry and exit of the limiting block 6 into and out of the limiting groove 4. The flange 11 and the fixing groove 12 prevent the cover plate 3 from being accidentally opened. Finally, the recessed portion enhances the aesthetics of the cover plate mechanism and facilitates the opening of the cover plate 3. The guide ramp 13 facilitates the entry of the flange 11 into the fixing groove 12. The gripping part 14 facilitates the operator's rotation of the cover plate 3. When the cover plate mechanism of this utility model is used in power electronic equipment, it can protect the control panel 15 and allow the control panel 15 to be opened quickly.

[0053] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A cover plate mechanism, characterized in that, Includes a base plate (1), a columnar shaft (2) disposed on the base plate (1), and a cover plate (3) rotatably connected to the columnar shaft (2). When the cover plate (3) is rotated, the cover plate (3) switches between a position close to the base plate and a position away from the base plate. One end of the columnar shaft (2) is provided with a limiting groove (4) and an arc-shaped groove (5) connected to the limiting groove (4); an obstruction part is provided at the connection between the limiting groove (4) and the arc-shaped groove (5); The cover plate (3) is provided with a limiting block (6), which slides in the limiting groove (4) and the arc-shaped groove (5); Rotate the cover plate (3) to move toward the position away from the bottom plate, the limiting block (6) slides in the arc groove (5) toward the limiting groove (4), the limiting block (6) passes over the obstruction and gets stuck in the limiting groove (4), and the cover plate (3) rotates to the position away from the bottom plate.

2. The cover plate mechanism according to claim 1, characterized in that, Both the arc-shaped groove (5) and the limiting groove (4) are located at the edge of one end of the columnar shaft (2).

3. The cover plate mechanism according to claim 2, characterized in that, The cover plate (3) includes a plate body (3a) and a rotating block (3b) connected to the plate body (3a). The rotating block (3b) is located at the end of the columnar shaft (2). The end of the columnar shaft (2) is provided with a protrusion (7). The rotating block (3b) is provided with a groove (8) that cooperates with the protrusion (7) and an opening groove (9) that communicates with the groove (8). The openings of the limiting block (6), the groove (8), and the opening groove (9) are all located on the first surface of the rotating block (3b). The surface of the rotating block (3b) adjacent to the first surface is the second surface. The opening groove (9) extends to the second surface. The protrusion (7) enters the groove (8) through the opening groove (9).

4. The cover plate mechanism according to claim 3, characterized in that, The protrusion (7) is columnar, and the radial cross section of the protrusion (7) is racetrack-shaped. The length of the long side of the protrusion (7) is greater than the width of the opening groove (9), and the length of the short side of the protrusion (7) is less than the width of the opening groove (9). The short side of the protrusion (7) is oriented toward the opening groove (9), and the protrusion (7) is driven to enter the groove (8) through the opening groove (9).

5. The cover plate mechanism according to claim 4, characterized in that, As the protrusion (7) enters the groove (8) through the opening groove (9), the limiting block (6) simultaneously enters the limiting groove (4).

6. The cover plate mechanism according to claim 1, characterized in that, The base plate (1) is provided with a connecting block (10) located away from the columnar shaft (2). The connecting block (10) is provided with a flange (11). The cover plate (3) is provided with a fixing groove (12) that mates with the flange (11). The flange (11) is positioned towards the columnar shaft (2). When the cover plate (3) is located at the position of fitting the base plate, the flange (11) enters the fixing groove (12).

7. The cover plate mechanism according to claim 6, characterized in that, The cover plate (3) is provided with a recessed portion for accommodating the connecting block (10), and the fixing groove (12) is disposed in the recessed portion; when the cover plate (3) is located in the position of the bottom plate, the connecting block (10) enters the recessed portion.

8. The cover plate mechanism according to claim 6, characterized in that, The cover plate (3) is provided with a guide slope (13); the cover plate (3) rotates toward the position of the bottom plate, the cover plate (3) undergoes elastic deformation and the flange (11) abuts against the cover plate (3), the flange (11) slides on the guide slope (13) until the flange (11) enters the fixing groove (12).

9. The cover plate mechanism according to claim 3, characterized in that, The plate (3a) is provided with a gripping part (14) that extends out of the edge of the plate (3a).

10. A power electronic device, characterized in that, Includes a control panel (15) and a cover plate mechanism as described in any one of claims 1 to 9; when the cover plate (3) is located in the position of adhering to the base plate, the cover plate (3) covers the control panel (15); when the cover plate (3) is located in the position away from the base plate, the cover plate (3) is away from the control panel (15).

Images