movable drawer unit

Abstract

This utility model relates to the field of low-voltage switchgear technology, specifically a movable drawer unit, comprising a fixed part and a movable part. The fixed and movable parts are connected by a slidable connection structure, allowing them to be slidably connected back and forth. The bottom of the movable part has a T-shaped sliding column, which engages with the guide rail inside the unit chamber for guiding and limiting the movement. The advantages of this utility model are: the T-shaped sliding column of the movable part engages with the guide rail inside the unit chamber for guiding and limiting the movement, solving the problem of movement failure and controlling the upward tilting of the rear of the movable part; furthermore, the clearance between the movable connection structure of the fixed and movable parts is no longer related to the movement limit, eliminating stress and the need to control the clearance, simplifying the unit structure, reducing the precision requirements for sheet metal parts processing, lowering costs, and reducing steel plate usage; and also increasing the internal width of the unit.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage switchgear technology, and in particular to a movable drawer unit. Background Technology

[0002] MS, GCS, and GCK drawer units (hereinafter collectively referred to as economic drawer units) are the mainstream terminal power supply equipment in low-voltage switchgear. When the economic drawer unit is in three-position operation, the entire drawer unit moves within the unit compartment in three positions. When the drawer unit is in the separated or test position, there is a certain gap between the unit door and the cabinet. Only when the drawer unit is in the connected position is the unit door tightly against the cabinet, and only then can the unit's operational protection rating reach IP40. The position interlocking mechanism of the economic drawer unit works in conjunction with the position positioning components within the unit compartment to position the drawer unit.

[0003] The difference between a movable drawer unit and an economy drawer unit lies in the fact that a movable drawer unit consists of two parts: a fixed part and a movable part, as seen in the applicant's Chinese patent applications 200410064770.9 and 200920037161.2. The fixed part includes a lead screw and a position interlocking mechanism, a position display mechanism, a closing interlocking mechanism, and a unit locking mechanism. The movable part is equipped with a nut that mates with the lead screw. The fixed and movable parts are connected together and can move back and forth. The lead screw on the fixed part, in conjunction with the nut, pushes the movable part to move back and forth relative to the fixed part. The position interlocking mechanism locks the lead screw by inserting the head end of a position locking plate into the splined bushing of the lead screw.

[0004] However, existing movable drawer units have the following technical drawbacks:

[0005] 1. The movable drawer unit has a push-in failure, and the push-in screw and nut have a short mechanical life.

[0006] The reason is as follows: The fixed part of the movable drawer unit has outer beams on both sides, which are L-shaped and have grooves. The movable part has a screw plate and an L-shaped inner beam. The movable part is slidably connected to the outer beam via a sliding post on the inner beam and a groove on the outer beam. The movable part is manually propelled by a push screw and screw nut installed on both the fixed and movable parts. The movable drawer unit is guided and limited by rollers or steel shafts on the side of the outer beam of the fixed part and guide rails on both sides of the unit compartment.

[0007] The clearance between the lead screw and the nut is only 0.3mm, and there is also a corresponding clearance between the sliding column of the movable part and the outer beam of the fixed part. Theoretically, the vertical clearance between the two can be designed to be 0.3mm. However, in actual production, it is difficult to achieve the front and rear flatness of the outer beam due to sheet metal bending. Even with special mold processing, the vertical clearance between the sliding column of the movable part and the groove of the outer beam is often greater than 0.5mm. When the lead screw is manually cranked to push the movable part to the connection position, the insertion resistance caused by the main circuit connector is generated. In particular, the insertion pressure of the 630A main circuit connector is 1500N~1800N. The insertion resistance is generated instantaneously, causing the rear of the movable part to tilt upward by more than 0.5mm. This causes the clearance between the rollers on both sides of the unit and the guide rail to disappear, resulting in compression. The clearance between the lead screw and the nut is only 0.3mm, but the overall upward tilt of the rear of the movable part is greater than 0.3mm. This will cause the lead screw and nut to be damaged due to compression, resulting in a mechanical life of less than 500 cycles, which is not up to standard.

[0008] 2. The maximum internal width of a 500mm cabinet unit is only 414mm. If the movable drawer unit is still pushed and guided by the rollers or steel shafts on the side of the outer beam of the fixed part and the guide rails on both sides of the unit interior, the internal width of the unit will be even smaller, and it will be impossible to achieve an internal width of 414mm. If the internal width of the unit is less than 414mm, the feasibility of arranging the main and auxiliary circuit connectors at the rear of the movable part cannot be met. Utility Model Content

[0009] The technical problem to be solved by this utility model is that the existing movable drawer unit has a propulsion failure, resulting in a short mechanical life of the propulsion mechanism.

[0010] The technical solution adopted by this utility model to solve its technical problem is: a movable drawer unit, including a fixed part and a movable part, with a slidable connection structure between the fixed part and the movable part for connecting the fixed part and the movable part together in a slidable manner. The bottom of the movable part has a T-shaped sliding column for engaging with the guide rail inside the unit for pushing, guiding and limiting.

[0011] In some embodiments, optionally, a slidable connection structure between the fixed portion and the movable portion is located on the left and right sides of the movable drawer unit.

[0012] In some embodiments, the fixed portion may optionally include a push interlock base plate and slide brackets on both sides of the push interlock base plate. A push screw is mounted on the fixed portion. The push interlock base plate is used for mounting the push screw and the position interlock mechanism. The slide brackets on both sides also extend to the left and right sides of the movable portion, respectively. The slidable connection structure between the fixed portion and the movable portion is located on the slide brackets and the movable portion, respectively.

[0013] In some embodiments, optionally, the slidable connection structure between the fixed part and the movable part is a groove-type connection structure. The groove-type connection structure specifically includes a groove and a groove screw that passes through the groove for connection and installation. The groove is located on the side of the groove bracket, and the groove screw passes through the groove to connect the groove bracket and the movable part together in a slidable manner.

[0014] Alternatively, the slide is located on the side of the movable part, and the slide screw passes through the slide to connect the slide bracket and the movable part together in a way that allows them to slide back and forth.

[0015] In some embodiments, optionally, there are at least two grooved screws on each side of the translational connection structure between the fixed portion and the movable portion.

[0016] In some embodiments, optionally, there are four T-shaped sliding columns, two of which are located on the left side of the bottom of the movable part and are arranged front to back for engaging with the guide rail on the left side of the unit interior, and the other two T-shaped sliding columns are located on the right side of the bottom of the movable part and are arranged front to back for engaging with the guide rail on the right side of the unit interior.

[0017] In some embodiments, optionally, the lead screw is mounted on the lead screw interlocking base plate via a lead screw mounting seat, and the movable portion has a nut that cooperates with the lead screw to push the movable portion to move back and forth. The nut is mounted on the movable portion via a nut mounting seat.

[0018] In some embodiments, optionally, the movable part includes a base plate, which is divided into front and rear parts, namely a front threaded nut plate and a rear base plate. The threaded nut plate is used for mounting the threaded nut, and the movable part is connected to the fixed part in a way that allows it to slide back and forth through the threaded nut plate.

[0019] The beneficial effects of this utility model are: In the prior art, the unit is pushed forward and guided by the guide rail and roller, as well as the sliding column of the movable part and the sliding groove on the outer beam of the fixed part. However, this utility model adopts the T-shaped sliding column of the movable part and the guide rail of the unit chamber to cooperate for pushing forward and guiding. The unit is pushed forward and backward and left and right in a balanced manner. The structure without squeezing effectively controls the failure of unit pushing.

[0020] In addition, the fit clearance between the movable connection structure between the fixed part and the movable part is no longer related to the push limit, no longer subject to force, and no longer requires control of the fit clearance, which simplifies the unit structure, reduces the processing accuracy requirements of sheet metal parts, reduces costs, and reduces the amount of steel plate used.

[0021] Meanwhile, this utility model adopts a T-shaped sliding column of movable part to cooperate with the guide rail of unit chamber for pushing, guiding and limiting, which can expand the inner width of the unit, so that the inner width of the movable drawer unit with a cabinet width of 500mm can reach a maximum of 414mm. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Figure 1 This is a structural diagram of the fixed part;

[0024] Figure 2 A schematic diagram of the wire mother plate for the fixed part and the movable part;

[0025] Figure 3 In order to be in Figure 2 A structural diagram showing the addition of a nut mounting base and a balance pressure plate to the existing structure;

[0026] Figure 4 In order to be in Figure 3 A structural diagram showing the addition of a cover plate and a limit switch to the existing structure.

[0027] Figure 5 In order to be in Figure 4 A structural diagram showing the addition of a rear base plate to the existing structure;

[0028] Figure 6 In order to be in Figure 4 A schematic diagram of the structure with the addition of a closing coupling mechanism on the basis;

[0029] Figure 7 This is a schematic diagram of the door opening structure of the unit room;

[0030] Figure 8 This is a schematic diagram of the door closing structure of a unit room;

[0031] Figure 9 This is a schematic diagram of the overall structure of the movable drawer unit;

[0032] Figure 10 This is a structural schematic diagram of the movable drawer unit assembly in the separated position;

[0033] Figure 11 This is a schematic diagram of the movable drawer unit assembly at the test location;

[0034] Figure 12 This is a structural schematic diagram of the movable drawer unit assembly at the connection position;

[0035] In the diagram, 1. Slide groove, 2. Slide groove screw, 3. Lead screw, 4. T-shaped slide column, 5. Unit chamber, 6. Unit chamber rear plate, 7. Guide rail, 8. Lead interlock base plate, 9. Slide groove bracket, 10. Lead screw mounting seat, 11. Lead screw nut, 12. Lead screw nut mounting seat, 13. Balance pressure plate, 14. Top cover plate, 15. Side plate, 16. Unit rear plate, 17. Lead screw nut plate, 18. Rear bottom plate, 19. Main circuit connector, 20. Auxiliary circuit connector, 21. Operating bushing, 22. Hook plate. Detailed Implementation

[0036] like Figures 1-12 As shown, a movable drawer unit includes a fixed part and a movable part. A sliding connection structure connects the fixed and movable parts, allowing them to slide forward and backward together. The bottom of the movable part has a T-shaped slide post 4, which engages with a guide rail 7 within the unit chamber 5 for guiding and limiting the unit's movement. The sliding connection structure between the fixed and movable parts is located on the left and right sides of the movable drawer unit.

[0037] The fixed part includes a push-locking base plate 8 and slide brackets 9 on both sides of the push-locking base plate 8. A push screw 3 is installed on the fixed part. The push-locking base plate 8 is used for the installation of the push screw 3 and the position interlocking mechanism. The slide brackets 9 on both sides also extend to both sides of the movable part. The movable connection structure between the fixed part and the movable part is located between the slide brackets 9 and the movable part. The movable connection structure between the fixed part and the movable part is specifically a slide-type connection structure. The slide-type connection structure specifically includes a slide 1 and a slide screw 2 that passes through the slide 1 for connection and installation. The slide 1 is located on the side of the slide bracket 9. The slide screw 2 passes through the slide 1 and is screwed onto the movable part to connect the slide bracket 9 and the movable part in a way that allows them to slide back and forth. Preferably, there are at least two slide screws 2 in the movable connection structure on each side.

[0038] Of course, it is also possible that the slide 1 is located on the side of the movable part, and the slide screw 2 passes through the slide 1 and is screwed onto the slide bracket 9 to connect the slide bracket 9 and the movable part in a way that allows them to slide back and forth.

[0039] The lead screw 3 is mounted on the push interlock base plate 8 via the lead screw mounting seat 10. The movable part has a nut 11 that cooperates with the lead screw 3 to push the movable part to move back and forth. The nut 11 is mounted on the movable part via the nut mounting seat 12. The lead screw mounting seat 10 and the nut mounting seat 12 have a balance pressure plate 13 for pushing, guiding and limiting the lead screw 3. One end of the balance pressure plate 13 is fixedly connected to the nut mounting seat 12, and the other end of the balance pressure plate 13 is movably connected to the lead screw mounting seat 10 via a movable connection structure. The movable connection structure between the balance pressure plate 13 and the lead screw mounting seat 10 is specifically a groove-type connection structure. The groove-type connection structure specifically includes a groove 1 and a groove screw 2 that passes through the groove 1 for connection and installation.

[0040] Of course, it is also possible that one end of the balance plate 13 is fixedly connected to the lead screw mounting base 10, and the other end of the balance plate 13 is connected to the lead screw mounting base 12 through a movable connection structure that can move back and forth.

[0041] The propulsion interlocking base plate 8 is also equipped with a position display mechanism and a unit locking mechanism. An upper cover plate 14 is installed on the propulsion interlocking base plate 8, which covers the position interlocking mechanism, the position display mechanism and the unit locking mechanism. A closing interlocking mechanism is installed on the upper cover plate 14.

[0042] The movable part includes a base plate, side plates 15 fixed to both sides of the base plate, and a unit rear plate 16 fixed to the rear end of the base plate. The base plate is divided into two parts: a front threaded nut plate 17 and a rear base plate 18. The threaded nut plate 17 is used for mounting the threaded nut 11, and the unit rear plate 16 is used for mounting the main circuit connector 19 and the auxiliary circuit connector 20. The movable part is connected to the fixed part in a horizontally movable manner via the threaded nut plate 17.

[0043] like Figures 1-12 As shown, a movable drawer unit assembly includes the aforementioned movable drawer unit and unit compartment 5.

[0044] The following is a more detailed description of the structure of each part of the movable drawer unit and the movable drawer unit assembly in this embodiment.

[0045] like Figure 1 As shown, the front end of the lead screw 3 has an operating sleeve 21, and the front end of the operating sleeve 21 is a hand crank operation hole that matches the crank handle.

[0046] The movable drawer unit and movable drawer unit assembly of this embodiment have three positions: a separated position, a test position, and a connected position. Therefore, the position interlocking mechanism is also a three-position interlocking mechanism. Of course, the movable drawer unit can also be a two-position movable drawer unit, namely a separated position and a connected position.

[0047] like Figures 1-3 As shown, the lead screw 3 includes a front smooth section and a rear lead screw section. The lead screw 3 is inserted into the lead screw mounting base 10 through the smooth section. The lead screw mounting base 10 has copper sleeves at both ends for mounting the smooth section. The operating bushing 21 is fitted onto the end of the smooth section extending from the lead screw mounting base 10 and fixed by a fixing pin. The balance pressure plate 13 is connected to the lead screw mounting base 10 through two sliding groove connection structures on the left and right sides. The balance pressure plate 13 ensures a higher degree of balance in the left-right and up-down directions of the drive engagement between the lead screw 3 and the nut 11, reaching ±0.3mm. This reduces friction during engagement, thus minimizing damage to both the lead screw 3 and the nut 11.

[0048] like Figure 5 As shown, the base plate of the movable part has a total of four T-shaped sliding pillars 4. Two of the T-shaped sliding pillars 4 are located on the left side of the bottom of the movable part and are arranged front to back, for engaging with the guide rail 7 on the left side inside the unit chamber 5. The other two T-shaped sliding pillars 4 are located on the right side of the bottom of the movable part and are arranged front to back, for engaging with the guide rail 7 on the right side inside the unit chamber 5. Specifically, two are fixed to the threaded mother plate 17 and two are fixed to the rear base plate 18. The threaded mother plate 17 and the rear base plate 18 are fixed to each other with self-tapping screws at the end bends.

[0049] like Figure 7 As shown, the unit chamber 5, which is used with the movable drawer unit, has two left and right guide rails 7, two left and right locking slots on the bottom plate for locking the unit in conjunction with the unit locking mechanism, and two left and right hook plates 22. The two left and right hook plates 22 are used to hook and engage with the hook plates 22 on the left and right sides of the bottom plate of the push-lock base plate 8. The T-shaped sliding column 4 of the bottom plate of the movable drawer unit is in a hooked state with the guide rails 7 in both the test position and the connection position. After the movable drawer unit is in the separated position, the movable drawer unit can be pulled out of the unit chamber 5 by lifting the handle of the unit locking mechanism to unlock the movable drawer unit. The rear of the unit chamber 5 is the unit chamber rear plate 6.

[0050] When the movable drawer unit is pulled out of the unit chamber 5, the T-shaped slide column 4 is blocked by the front end of the guide rail 7 to prevent it from falling. The movable drawer unit is slightly lifted, and the T-shaped slide column 4 exits the guide rail groove of the guide rail 7 through the slide column inlet at the front end of the guide rail 7, and then crosses the front end of the guide rail 7, so the movable drawer unit can be pulled out.

[0051] The advantages of this embodiment are:

[0052] The fixed part of this utility model eliminates the outer beam. The movable drawer unit uses a T-shaped sliding column 4 and a guide rail 7 in the unit chamber 5 for push-in guidance. The fit gap between the movable connection structure between the fixed part and the movable part is no longer related to the push-in limit, no longer subject to force, and no longer requires control of the fit gap. This simplifies the unit structure, reduces the processing accuracy requirements of sheet metal parts, reduces costs, and reduces the amount of steel plate used.

[0053] Meanwhile, this design solves the problem of propulsion failure. The upward tilting of the rear of the movable part is controlled. After the movable drawer unit is locked in the unit chamber 5, the T-shaped sliding column 4 on the movable part hooks with the guide rail 7, making the propulsion limit gap of the movable part smaller. The propulsion balance is completely determined within 0.25mm to 0.4mm without change. This eliminates the defect of damage to the propulsion screw 3 and screw nut 11 due to compression. Even for a 630A movable drawer unit with a main circuit connector 19 insertion pressure of 2500N, when the movable part is pushed to the connection position, the connection surface of the main circuit connector 19 can meet the standard 100%, the propulsion mechanism will not be damaged, the reliability is greatly improved, the mechanical life reaches more than 1000 times, and the temperature rise of the main circuit connector 19 is guaranteed to be within 5K.

[0054] Based on the hook-and-loop engagement between the T-shaped slide column 4 and the guide rail 7 in the unit chamber 5, the reliability of the propulsion mechanism is further improved by adding a balance pressure plate 13 to the propulsion screw 3 and screw nut 11.

[0055] After eliminating the outer beam in the fixed section, the only components of the movable drawer unit requiring specialized mold sheet metal processing to ensure machining accuracy are the sheet metal parts of the fixed section and the threaded mother plate 17 of the movable section. After dividing the base plate of the movable section into the threaded mother plate 17 and the rear base plate 18, the applicant, as the supplier to the switchgear equipment manufacturer, only needs to provide the switchgear equipment manufacturer with components including the interlocking mechanism, etc. Figure 4 The unit assembly shown can be assembled separately. The switchgear equipment manufacturer can purchase and process other components on its own, which reduces the cost for users to purchase switchgear equipment from the switchgear equipment manufacturer.

[0056] In this invention, the bottom of the movable part is connected to the bottom plate of the unit chamber 5 via a T-shaped sliding column 4 and a guide rail 7 for pushing and guiding, which changes the existing technology where the movable drawer unit uses outer rollers to cooperate with the guide rails 7 on both sides of the unit chamber 5 for pushing and guiding. This increases the inner width of the unit, meeting the space requirements for arranging 32 secondary plug-in points in a movable drawer unit with a cabinet width of 600mm and a unit height of 150mm when used for control circuits, and meeting the space requirements for arranging secondary plug-in points and RJ45 communication plug-in points in a movable unit switch cabinet with a cabinet width of 500mm when used for power distribution circuits and control circuits.

Claims

1. A movable drawer unit, characterized in that: It includes a fixed part and a movable part. The fixed part and the movable part have a translatable connection structure for connecting the fixed part and the movable part together in a translatable manner. The bottom of the movable part has a T-shaped sliding column (4) for hooking and cooperating with the guide rail (7) in the unit chamber (5) for propulsion guidance and limiting.

2. The movable drawer unit according to claim 1, characterized in that: The movable connection structure between the fixed part and the movable part is located on the left and right sides of the movable drawer unit.

3. The movable drawer unit according to claim 1, characterized in that: The fixed part includes a push interlock base plate (8) and slide brackets (9) on both sides of the push interlock base plate (8). A push screw (3) is installed on the fixed part. The push interlock base plate (8) is used for the installation of the push screw (3) and the position interlocking mechanism. The slide brackets (9) on both sides also extend to the left and right sides of the movable part respectively. The translatable connection structure between the fixed part and the movable part is located on the slide brackets (9) and the movable part respectively.

4. The movable drawer unit according to claim 3, characterized in that: The movable connection structure between the fixed part and the movable part is specifically a sliding groove connection structure. The sliding groove connection structure specifically includes a sliding groove (1) and a sliding groove screw (2) that passes through the sliding groove (1) for connection and installation. The sliding groove (1) is located on the side of the sliding groove bracket (9). The sliding groove screw (2) passes through the sliding groove (1) to connect the sliding groove bracket (9) and the movable part together in a way that allows them to move back and forth. Alternatively, the slide (1) is located on the side of the movable part, and the slide screw (2) passes through the slide (1) to connect the slide bracket (9) and the movable part together in a way that allows them to slide back and forth.

5. The movable drawer unit according to claim 4, characterized in that: There are at least two grooved screws (2) on each side of the translatable connection structure between the fixed part and the movable part.

6. The movable drawer unit according to claim 1, characterized in that: There are four T-shaped sliding columns (4), two of which are located on the left side of the bottom of the movable part and are arranged front to back, for hooking and cooperating with the guide rail (7) on the left side of the unit chamber (5). The other two T-shaped sliding columns (4) are located on the right side of the bottom of the movable part and are arranged front to back, for hooking and cooperating with the guide rail (7) on the right side of the unit chamber (5).

7. The movable drawer unit according to claim 3, 4, or 5, characterized in that: The push screw (3) is mounted on the push interlock base plate (8) via the screw mounting seat (10). The movable part has a screw nut (11) that cooperates with the push screw (3) to push the movable part to move back and forth. The screw nut (11) is mounted on the movable part via the screw nut mounting seat (12).

8. The movable drawer unit according to claim 1 or 3, characterized in that: The movable part includes a base plate, which is divided into front and rear parts, namely a front thread mother plate (17) and a rear base plate (18). The thread mother plate (17) is used for the installation of the thread mother (11). The movable part is connected to the fixed part in a forward and backward manner through the thread mother plate (17).

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