Functional unit of low-voltage complete equipment positioned and guided through a chute

Abstract

The present invention relates to a functional unit of a low-voltage complete set of equipment guided and positioned through a sliding groove, including a unit chamber and a unit assembly within the unit chamber. There is a guide rail device on each of the left and right sides of the unit assembly. The guide rail device includes a sliding groove and at least two sliding members arranged front and rear and embedded in the sliding groove. The sliding members and the sliding groove are respectively located at the bottom of the unit assembly and on the unit chamber floor plate of the unit chamber. The sliding groove includes a forward movement stroke segment and a rear connection stroke segment distributed front and rear. The rear connection stroke segment is used to cooperate with the rear sliding member to guide the unit assembly in the connection stroke. The fitting clearance between the forward movement stroke segment and the sliding member > the fitting clearance between the rear connection stroke segment and the sliding member. The beneficial effects are as follows: The sliding groove type guide rail device can effectively ensure the correct alignment and insertion of the main and auxiliary circuit connectors during the displacement operation of the functional unit, and ensure more reliable main circuit connection performance; at the same time, the structure is simple, with few parts and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage complete sets of equipment, and particularly to a functional unit of a low-voltage complete set of equipment guided and positioned through a chute. Background Art

[0002] The functional unit of the low-voltage draw-out switchgear has been introduced from foreign BFC and MS cabinet types since the 1990s and has reached 34 years. The large knife plate push-open unit of Tianchuan Institute was applied in the market in 1994 for 10 years and has been basically phased out. The displacement deviation of the large knife plate propulsion mechanism in the one-way torsion propulsion of the drawer reaches 3 - 5 mm, and the mechanical jamming failure is relatively serious. In 1998, a drawer unit with a GCS worm propulsion mechanism applying a hanging guide rail appeared. The clearance between the drawer and the guide rail is 1.0 - 1.2 mm, and the jamming failure rate is also relatively serious when pushing the drawer. Currently, it is also completely phased out.

[0003] MS guide rail structure: The clearance between the rollers installed on both sides of the drawer and the upper and lower parts of the guide rail is 1.0 mm, and the clearance between the drawer and both sides of the guide rail is 1.5 mm on one side. There is no propulsion mechanism for the large interlock hand-pushed drawer. It is difficult to push and pull out a 630A current, but the MS guide rail structure is still used in the industry, and the usage of the large interlock mechanism is decreasing.

[0004] The potential deviation direction of the drawer unit operation is the outgoing line side. The position of the incoming line busbar arrangement and the position of the outgoing line static socket arrangement are offset from the center of the unit by 25 - 30 mm. The secondary plug-in needs to be arranged on the outgoing line side, and there are at most 36 plug-in points for the secondary. The propulsion mechanism is arranged in the center of the unit. Therefore, the connection resistance on the outgoing line side of the unit is relatively large. But why is the potential deviation direction the outgoing line side to the right? The reason is that the spiral hand-crank mechanism (worm) has an inclination of 2.5 - 3.0 mm for the inclined thread, and the deviation of the small-current hand-pulled linear propulsion is relatively small. When the drawer is hand-cranked and pushed to the connection stroke, the maximum deviation of the 630A drawer reaches more than 3.0 mm. It is necessary to install a guiding and limiting mechanical device at the bottom of the unit room and the drawer to control the deviation within 1.0 mm. For example, in the publicly disclosed patent document CN211790382U, a main circuit body commutating plug, a main circuit connection structure, a movable assembly and a functional unit, a guiding bar and an operating stroke limiting groove block cooperating with it are added between the unit assembly and the unit room to effectively position the unit assembly left and right. The clearance between the guiding bar and the operating stroke limiting groove block cooperating with it is 0.5 mm on one side, and the guiding bar and the operating stroke limiting groove block cooperating with it can also limit the end point of the unit assembly entering the connection position at the same time.

[0005] Through the actual test of the main circuit contact resistance, it is found that when the offset of the center of the plug of the main circuit from the bus or socket is within 1.0 mm, the contact resistance measured by the instrument flickers between 50 and 80 μΩ, and stabilizes at 70 μΩ after flickering 5 to 6 times. When the offset of the center of the plug of the main circuit from the bus or socket is greater than 1.0 mm and within 2.0 mm, the contact resistance measured by the instrument flickers unstably between 50 and 200 μΩ. Thus, it can be concluded that in the actual operation state of the equipment, if the offset of the center of the plug of the main circuit from the bus or socket is greater than 1.0 mm, such as in the motor circuit, the temperature rise of the plug is unstable. After a long operation time, the plug of the main circuit will have an overheating fault. Figure 9 The situation where there is an offset L1 between the center of the plug of the main circuit and the bus is shown.

[0006] In the optimal state, the offset control through the drawer displacement operation within 1.0 mm can ensure that the offset of the center of the plug of the main circuit from the bus or socket is controlled within 1.0 mm. However, in the mass production of equipment manufacturers, due to the large tolerance of the sheet metal parts of the functional unit, there is a certain proportion of cases where there are deviations in the center of the plug of the main circuit from the bus or socket itself. The overheating fault of the plug cannot be eliminated, which will reduce the service life of the equipment. Therefore, the smaller the offset of the drawer displacement operation, the higher the reliability of the plug insertion, and the relatively stable the temperature rise of the plug during operation.

[0007] In the prior art, there are also a cooperating upper hook plate and lower hook plate between the unit chamber and the functional unit assembly in the unit chamber to control the upward movement of the functional unit during displacement operation. Summary of the Invention

[0008] The technical problem to be solved by the present invention is that the cooperation between the existing MS guide rail and the rollers on both sides of the drawer unit cannot effectively control the offset of the displacement operation of the unit assembly left and right, and auxiliary guiding parts must be used to solve the problem, increasing the parts.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a functional unit of a low-voltage complete set of equipment guided and positioned through a chute, including a unit chamber and a unit assembly in the unit chamber. There is a guide rail device on each of the left and right sides of the unit assembly for guiding the movement of the unit assembly in the unit chamber. The guide rail device includes a chute and at least two sliding parts arranged front and back vertically embedded in the chute. The sliding parts are located on the bottom plane of the unit assembly, and the chute is located on the upper plane of the unit chamber floor of the unit chamber. The chute includes a forward travel segment and a rear connection travel segment distributed front and back. The forward travel segment is used to cooperate with all the sliding parts to guide the unit assembly before the connection travel, and the rear connection travel segment is used to cooperate with the rear sliding parts to guide the unit assembly in the connection travel. The center line of the rear connection travel segment is on the same straight line as the center line of the forward travel segment, and the clearance between the forward travel segment and the sliding parts > the clearance between the rear connection travel segment and the sliding parts.

[0010] Further limit that the clearance between the post-connection stroke section and the slider is 0.8 - 1.2 mm, and the clearance between the propulsion stroke section and the slider is 1.8 - 2.2 mm.

[0011] Preferably, the clearance between the connection stroke section and the slider is 1.0 mm, and the clearance between the propulsion stroke section and the slider is 2.0 mm.

[0012] Further limit that the number of sliders of the guide rail device is two. The right groove surface of the propulsion stroke section has a section of inward protrusion, forming a section of pre-connection stroke section for cooperating with the front slider to guide the unit assembly in the connection stroke. The clearance between the propulsion stroke section and the slider > the clearance between the pre-connection stroke section and the slider > the clearance between the post-connection stroke section and the slider.

[0013] Further limit that the clearance between the pre-connection stroke section and the slider is 1.5 - 1.8 mm.

[0014] Preferably, the clearance between the pre-connection stroke section and the slider is 1.7 mm.

[0015] Further limit that the bottom plane of the unit assembly and the unit chamber floor have an upper hook plate and a lower hook plate that are in a vertically interlocking fit. When the unit assembly enters the connection stroke, the upper hook plate and the lower hook plate are in a vertically interlocked combined state. When the unit assembly moves to the front end point of the moving stroke, the upper hook plate and the lower hook plate are in a state of mutual detachment.

[0016] Further limit that the chute is specifically provided by the guide rail, and the slider is specifically a cylindrical sliding column.

[0017] Further limit that the guide rail has a protruding upper plane. The chute is opened on the upper plane of the guide rail. There is also a protruding rib extending along the moving direction of the unit assembly on the upper plane. The guide rail supports the movement of the unit assembly through the rib.

[0018] Further limit that both ends of the chute are closed for respectively cooperating with the front and rear sliders to limit the moving stroke of the unit assembly.

[0019] A functional unit of a low-voltage complete set of equipment guided and positioned by a chute, comprising a unit chamber and a unit assembly inside the unit chamber. There is a guide rail device on each of the left and right sides of the unit assembly for guiding the movement of the unit assembly inside the unit chamber. The guide rail device includes a chute and at least two sliding members arranged front and back and embedded in the chute. The sliding members and the chute are respectively located at the bottom of the unit frame of the unit assembly and on the unit chamber floor of the unit chamber. There are an upper hook plate and a lower hook plate on the bottom of the unit frame and the unit chamber floor that are in a vertically hooked and mated state. During the process of the unit assembly entering the connection position, the upper hook plate and the lower hook plate are in a vertically hooked and combined state.

[0020] The beneficial effects of the present invention are as follows: The chute-type guide rail device of the present invention can effectively ensure the correct alignment and insertion of the main and auxiliary circuit connectors during the displacement operation of the functional unit, and ensure that the main circuit connection performance is more reliable;

[0021] Compared with the existing roller-type guide rail device, the chute-type guide rail device of the present invention has a simple structure, fewer parts, and a lower cost. It uses aluminum alloy material, reducing the installation labor cost;

[0022] Furthermore, the design of the push stroke segmentation and the connection stroke segmentation completely dissects the operation process of the draw-out and removable units. When the design of the clearance between the connection stroke segmentation and the sliding member is 1 mm, it can dynamically correct the potential offset within 0.5 mm when entering the connection stroke, ensure that the displacement of the main circuit plug-in center is within 0.5 mm, achieve reliable contact of the R contact points of the plug pieces of the main circuit plug, reduce the damage to the electroplated layers of the plug pieces and the busbars during plugging, be flexible without mechanical jamming during operation, have a stable operation, ensure that the insertion depth of the main circuit plug is consistent, ensure that the error between the unit door and the column edge is within 0.5 mm, meet the standard requirement that the door gap is less than 1.0 mm, and have a neat appearance;

[0023] Both the draw-out and removable units are functional units that use the main circuit plug for main circuit plug-in connection. The chute-type guide rail device of the present invention can be applied to the draw-out and removable units, solving one by one the structural technical problems of the displacement operation of the draw-out and removable units, achieving an improvement in the reliability of the main circuit plug-in connection, an improvement in the stability of the plug's bearing capacity for the motor starting overload peak value, ensuring an extension of the equipment operation life, and a very significant improvement in the social and economic benefits in equipment applications. Description of the Drawings

[0024] The present invention will be further described below in conjunction with the drawings and embodiments;

[0025] Figure 1 It is a schematic structural diagram of the guide rail of Embodiment 1 of the present invention;

[0026] Figure 2 It is a combined state diagram of the guide rail and the sliding column of Embodiment 1 of the present invention at the connection position;

[0027] Figure 3 Schematic structural diagram of the unit chamber of Embodiment 1 of the present invention;

[0028] Figure 4 Schematic structural diagram of the drawer of Embodiment 1 of the present invention;

[0029] Figure 5 Schematic structural diagram of the drawer unit of Embodiment 1 of the present invention in the connected position;

[0030] Figure 6 Schematic structural diagram of the unit chamber of Embodiment 2 of the present invention;

[0031] Figure 7 Schematic structural diagram of the removable plug-in unit assembly of Embodiment 2 of the present invention;

[0032] Figure 8 Schematic structural diagram of the removable plug-in unit of Embodiment 2 of the present invention in the connected position;

[0033] Figure 9 Schematic structural diagram of the connection between the main circuit moving plug and the busbar;

[0034] Figure 10 Schematic structural diagram of the guide rail of Embodiment 2 of the present invention;

[0035] In the figure, 1. Unit assembly, 2. Guide rail, 2-1. Slide groove, 2-2. Rib, 3. Slide post, 4. Unit chamber floor, 5-1. Upper hook plate, 5-2. Lower hook plate, 8. Main circuit plug, 9. Busbar, 10. Static socket for outgoing line, 11. Front end closed section, 12. Pushing stroke section, 13. Rear connection stroke section, 14. Front connection stroke section, 15. Inward protruding part. Detailed implementation manners

[0036] Embodiment 1, as Figures 1 to 5 shown, a functional unit of a low-voltage complete set of equipment guided and positioned through a slide groove, the functional unit is specifically a drawer unit, including a unit chamber and a unit assembly 1 inside the unit chamber. The unit assembly 1 is specifically a drawer. There is a guide rail device on each of the left and right sides of the unit assembly 1 for guiding the movement of the unit assembly 1 in the unit chamber. The guide rail device includes a slide groove 2-1 and at least two sliding members arranged front and back and embedded in the vertical slide groove 2-1. The slide groove 2-1 is specifically provided by the guide rail 2, and the sliding member is specifically a cylindrical slide post 3. The slide post 3 is installed on the bottom plane of the unit assembly 1, and the guide rail 2 is installed on the upper plane of the unit chamber floor 4 of the unit chamber. The upper hook plate 5-1 and the lower hook plate 5-2 that are in hook-fit with each other up and down are provided on the bottom plane of the unit assembly 1 and the unit chamber floor 4. During the process of the unit assembly 1 entering the connected position, the upper hook plate 5-1 and the lower hook plate 5-2 are in the combined state of being hooked up and down.

[0037] As Figure 1 shown, the guide rail 2 has a protruding upper plane, and the chute 2-1 is opened on the upper plane of the guide rail 2. There is also a protruding rib 2-2 extending along the moving direction of the unit assembly 1 on the upper plane. There are two ribs 2-2 on each guide rail 2, located on the left and right sides of the chute 2-1 respectively. The guide rail 2 supports the movement of the unit assembly 1 through the ribs 2-2. The rib 2-2 is used to reduce the frictional resistance of the unit assembly 1 moving in the unit chamber, reduce the unit operating force, and basically does not friction the unit frame of the unit assembly 1, resulting in the peeling off of the steel plate plating layer of the unit frame. The rib 2-2 is not shown in the attached Figures 3 to 9 drawing.

[0038] The chute 2-1 of the guide rail 2 includes a forward stroke segment 12 and a rear connection stroke segment 13 distributed front and rear. The forward stroke segment 12 is used to cooperate with all the sliding columns 3 to guide the unit assembly 1 before the connection stroke, and the rear connection stroke segment 13 is used to cooperate with the sliding columns 3 at the rear to guide the unit assembly 1 in the connection stroke. The center line of the rear connection stroke segment 13 is on the same straight line as the center line of the forward stroke segment 12. The clearance between the forward stroke segment 12 and the sliding column 3 > the clearance between the rear connection stroke segment 13 and the sliding column 3.

[0039] Both ends of the chute 2-1 are closed, which is used to cooperate with the sliding column 3 to limit the moving stroke of the unit assembly 1. The front closed end of the chute 2-1 is the front termination point of the moving stroke, and the rear closed end of the chute 2-1 is the rear termination point of the moving stroke. The front termination point of the moving stroke can play an anti-falling effect. When the unit assembly 1 moves to the front termination point of the moving stroke, the upper hook plate 5-1 and the lower hook plate 5-2 are in a separated state. The rear termination point of the moving stroke can define the end point of the unit assembly 1 entering the connection position.

[0040] There is also a front closed end segment 11 in front of the forward stroke segment 12. The chute 2-1 of the guide rail 2 is specifically divided into three segments from front to back, namely the front closed end segment 11, the forward stroke segment 12, and the rear connection stroke segment 13. The clearance between the front closed end segment 11 and the sliding column 3 is greater than the clearance between the forward stroke segment 12 and the sliding column 3. The enlarged front closed end segment 11 is used to facilitate the insertion of the sliding column 3 into the chute 2-1. The front end of the front closed end segment 11 is the closed front end of the chute 2-1, and the rear end of the rear connection stroke segment 13 is the closed front end of the chute 2-1.

[0041] The bottom of the unit assembly 1 has three upper hook plates 5-1. Two of the upper hook plates 5-1 are located at the rear of the unit assembly 1 and are arranged left and right, and the other upper hook plate 5-1 is located at the front middle or near the middle position of the unit assembly 1.

[0042] The functions of the upper hook plate 5-1 and the lower hook plate 5-2 are as follows: when the unit assembly 1 enters the unit chamber, the slide post 3 on the unit assembly 1 is embedded in the slide groove 2-1 of the unit chamber, and the unit assembly 1 is effectively positioned left and right relative to the unit chamber, and the main circuit plug 8 is correctly aligned with the busbar 9 and the outlet static socket 10. Since the matching structure of the guide rail 2 and the slide post 3 is only for left and right positioning, the unit assembly 1 needs to be positioned up and down when plugging and unplugging. Therefore, the upper hook plate 5-1 and the lower hook plate 5-2 need to be arranged between the unit assembly 1 and the unit chamber. When the unit assembly 1 moves backward for connection operation, the upper hook plate 5-1 and the lower hook plate 5-2 can cooperate with each other to effectively position the unit assembly 1 up and down, ensuring that during the connection operation of inserting the unit assembly 1, the main circuit plug 8 is correctly aligned and plugged in within ±0.5mm.

[0043] The fitting clearance between the rear connecting stroke segment 13 and the sliding column 3 is 0.8-1.2mm, and the fitting clearance between the propulsion stroke segment 12 and the sliding column 3 is 1.8-2.2mm. In actual applications, the fitting clearance between the propulsion stroke segment 12 and the sliding column 3 is 2mm, that is, the fitting clearance is 1mm on one side. The fitting clearance between the rear connecting stroke segment 13 and the sliding column 3 is 1mm, that is, the fitting clearance is 0.5mm on one side. The fitting clearances of the upper hook plate 5-1 and the lower hook plate 5-2 are both 0.5mm, and the offset range of the unit assembly 1 is completely fixed within 0.5mm. There will be no extrusion or mechanical friction between the upper hook plate 5-1 and the lower hook plate 5-2. Therefore, the guide strip and the operating stroke limit slot block matched therewith in the prior art can be eliminated, saving 5 yuan per unit.

[0044] The specific displacement operation of this embodiment 1 is as follows: in the process of the drawer entering the unit room, the two slide posts 3 at the rear of the drawer and the two slide posts 3 in front of the drawer are successively embedded in the guide rail 2 through the front end closed opening section 11 in front of the guide rail 2, and the two slide posts 3 in the front are against the front end closed opening of the guide rail 2. At this time, the drawer is in a separated position, and the upper hook plate 5-1 and the lower hook plate 5-2 are in an up and down disengaged state; in the process of pushing the drawer into the test position, the four slide posts 3 at the bottom of the drawer are all in the pushing stroke segment 12 of the guide rail 2, and the upper hook plate 5-1 and the lower hook plate 5-2 begin to enter the hooking state, and the secondary power supply is turned on when the drawer reaches the test position; continue to push the drawer, the drawer enters the connection stroke, the two slide posts 3 in front of the drawer are still in the pushing stroke segment 12, and the two slide posts 3 at the back of the drawer enter the connection stroke segment 13, the left and right offset of the drawer is controlled to be within 0.5mm, the upper hook plate 5-1 and the lower hook plate 5-2 are all hooked, and the drawer is controlled to lift up, ensuring that the main circuit plug 8 is normally plugged and connected during the plugging process.

[0045] The 630A sample cabinet adopting the structural principle of Embodiment 1 is tested. The incoming and outgoing line sides of the sample cabinet are three-pole main circuit plugs. The contact pressure of the main circuit plug 8 is 1620N, and there are 12 contact points on the secondary plug with a contact pressure of 100N. The gap between the drawer plug mounting plate and the rear plate of the cabinet is designed to be 15mm. The actual detection shows that the gap on the incoming line side is 14.2mm, the gap on the outgoing line side is 14.5mm, and the left-right deviation of the drawer is 0.3mm.

[0046] When the connection between the active circuit plug 8 on the incoming line side and the busbar 9 is in a static state, the insertion depth deviation of the three-stage of the single-phase main circuit plug 8 can be controlled within ±0.5mm, and the insertion depth deviation of the three-phase main circuit plug 8 can be controlled within ±0.5mm. The insertion depth deviation between the three-phase on the incoming line side and the three-phase on the outgoing line side of the main circuit plug 8 can be controlled within ±0.3mm. The above test data is the basis for ensuring the plugging reliability of the active circuit plug. The contact piece of the main circuit plug 8 is detected with a 0.015 feeler gauge, and the effective contact area reaches more than 90%. Generally, the detection requirement in the industry is that the effective contact area is more than 70% with a 0.3 feeler gauge. The detection results show that Embodiment 3 achieves the goal of controlling the operation displacement deviation within 0.5mm. In the actual working condition of the drawer unit during the operation of the present invention technology, during the detection of the overload delay impact current of 30×7.2 times of the main circuit plug 8, all the temperature rises are qualified. The resistance in the temperature rise is 220 μΩ (detected by the Electric Power Research Institute in Suzhou, Jiangsu), while the standard allows 1000 μΩ.

[0047] Embodiment 2, as Figures 6 to 8 shown, is basically the same as Embodiment 1, except that: the functional unit of this Embodiment 2 is specifically a removable plug-in unit, including a unit chamber and a unit assembly 1 inside the unit chamber. The unit assembly 1 is specifically a removable plug-in unit assembly. The removable plug-in unit assembly and the unit chamber are also guided and positioned for movement through the guide rail device and the upper hook plate 5-1 and the lower hook plate 5-2 in Embodiment 1.

[0048] Embodiment 3, compared with Embodiment 1, is different in that: the right side groove surface of the stroke segmentation 12 of the sliding groove 2-1 of the guide rail 2 in this Embodiment 3 has a section of inward convex part (15), forming a section of front connection stroke segmentation 14 for guiding the unit assembly 1 in the connection stroke in cooperation with the front sliding member. The clearance between the stroke segmentation 12 and the sliding column 3 > the clearance between the front connection stroke segmentation 14 and the sliding column 3 > the clearance between the rear connection stroke segmentation 13 and the sliding column 3.

[0049] The clearance between the advancing stroke segment 12 and the slide post 3 is 1.8 - 2.2 mm, the clearance between the front connection stroke segment 14 and the slide post 3 is 1.5 - 1.8 mm, and the clearance between the rear connection stroke segment 13 and the slide post 3 is 0.8 - 1.2 mm. In actual application, the clearance between the advancing stroke segment 12 and the slide post 3 is 2 mm, the clearance between the front connection stroke segment 14 and the slide post 3 is 1.7 mm, and the clearance between the rear connection stroke segment 13 and the slide post 3 is 1 mm.

[0050] The guide rail devices guided by the chute 2-1 of Embodiments 1, 2, and 3 of the present invention have fully met the application requirements during trial production. The cost is 15% lower than that of the existing roller guide rail devices. In addition, by canceling the guide strip and the operation stroke limit groove block cooperating with it, the cost saved for 1 unit is 5 yuan, and 8 - 10 yuan can be saved for 1 unit.

[0051] There is a diagonal error in the cabinet column frame of the low-voltage complete equipment, and the unit chamber floor 4 fixed on the column also has an error synchronously. The guide rail 2 is fixed on both sides of the unit chamber floor 4, and the straightness of the front and rear ends of the guide rail 2 cannot reach 100% correctness. There is a situation where the centers of the front and rear ends of the two guide rails 2 in each unit chamber of 1 equipment have different errors, which is collectively referred to as the manufacturing cumulative assembly error in the industry. The drawer sheet metal assembly also has manufacturing cumulative errors. The drawers of the drawer unit have different depths. For every 100 mm increase in the drawer depth, the deviation of the centers of the front and rear ends of the guide rail 2 will be a little larger. Therefore, the clearance between the chute 2-1 of the guide rail 2 and the slide post 3 of the drawer should fully consider the manufacturing cumulative tolerances of the drawer and the unit chamber. The groove width of the connection stroke segment 13 can not only ensure the swing amount of the front and rear R contact points of the plug when the main circuit plug 8 is inserted into the bus bar 9, ensuring the contact reliability of the plug, but also ensure the reduction of the displacement amount at the front end of the drawer. However, considering that the clearance between the chute 2-1 of the guide rail 2 and the slide post 3 of the drawer during the movement of the drawer should not be too small, the key consideration is the manufacturing cumulative error. The groove width of the connection stroke segment 13 is small, and the groove width of the advancing stroke segment 12 is large, which is a feasible conclusion drawn from practice, that is, it can ensure the connection reliability of the plug and ensure that there is no mechanical jamming during propulsion.

[0052] In addition, the connection stroke of the drawer unit is between 13 - 15 mm. When the main circuit plug 8 and the bus bar 9 are inserted, the difference in the insertion force on the incoming and outgoing line sides will cause a slight slope between the rear end and the front end of the drawer, and the drawer door will shift towards the outgoing line end, resulting in uneven clearance between the drawer door and the column. The deeper the drawer depth, especially when the drawer depth is 400 mm, the more obvious the offset between the rear end and the front end of the drawer will be. Therefore, the single-sided inward protrusion of the front connection stroke segment 14 can control the drawer door, reduce the offset amount, effectively ensure the even clearance between the drawer door and the column, and improve the appearance.

[0053] The fit of the clearance between the drawer and the guide rail 2 is not a single mathematical formula. Instead, in practice, it is necessary to master the feasibility of the dynamic displacement requirements in the design of the principle of dynamic measurement during the drawer operation process. This technology is regarded as a research topic in the industry. The technical solution of the present invention has outstanding technical progress compared with the solution disclosed in the company's patent document CN211790382U. The invention of the correct positioning principle of the drawer slide column positioning drawer structure with a guide rail chute type solves the potential tolerance structural problems of the cabinet unit, ensures the reliability of the center connection of the main circuit plug within ±0.5 mm, and at the same time ensures the appearance technical requirements of the overlap between the drawer door and the cabinet column within ±0.5 mm.

Claims

1. A functional unit of a low-voltage complete set of equipment guided and positioned by a sliding groove, comprising a unit chamber and a unit assembly (1) inside the unit chamber, characterized in that: On each of the left and right sides of the unit assembly (1), there is a guide rail device for guiding the movement of the unit assembly (1) in the unit chamber. The guide rail device includes a chute (2-1) and at least two sliding members vertically inserted into the chute (2-1) and arranged front and back. The sliding members are located on the bottom plane of the unit assembly (1), and the chute (2-1) is located on the upper plane of the unit chamber floor (4) of the unit chamber. The chute (2-1) includes a forward travel segment (12) and a rear connection travel segment (13) distributed front and back. The forward travel segment (12) is used to cooperate with all the sliding members to guide the unit assembly (1) before the connection travel. The rear connection travel segment (13) is used to cooperate with the rear sliding members to guide the unit assembly (1) in the connection travel. The center line of the rear connection travel segment (13) is on the same straight line as the center line of the forward travel segment (12). The fitting clearance between the forward travel segment (12) and the sliding member > the fitting clearance between the rear connection travel segment (13) and the sliding member.

2. The functional unit of the low-voltage complete equipment guided and positioned by the chute according to claim 1, characterized in that: The fitting clearance between the rear connection travel segment (13) and the sliding member is 0.8 - 1.2 mm, and the fitting clearance between the forward travel segment (12) and the sliding member is 1.8 - 2.2 mm.

3. The functional unit of the low-voltage complete set of equipment guided and positioned through the sliding groove according to claim 2, characterized in that: The fitting clearance between the connection travel segment and the sliding member is 1.0 mm, and the fitting clearance between the forward travel segment (12) and the sliding member is 2.0 mm.

4. The functional unit of the low-voltage complete set of equipment guided and positioned through the chute according to claim 1 or 2 or 3, characterized in that: The number of sliding members of the guide rail device is two. The right side groove surface of the forward travel segment (12) has a section of inward protrusion (15), forming a front connection travel segment (14) for cooperating with the front sliding member to guide the unit assembly (1) in the connection travel. The fitting clearance between the forward travel segment (12) and the sliding member > the fitting clearance between the front connection travel segment (14) and the sliding member > the fitting clearance between the rear connection travel segment (13) and the sliding member.

5. The functional unit of the low-voltage complete set of equipment guided and positioned through the chute according to claim 4, characterized in that: The fitting clearance between the front connection travel segment (14) and the sliding member is 1.5 - 1.8 mm.

6. The functional unit of the low-voltage complete set of equipment guided and positioned through the sliding groove according to claim 5, characterized in that: The fitting clearance between the front connection travel segment (14) and the sliding member is 1.7 mm.

7. The functional unit of the low-voltage complete set of equipment guided and positioned through the sliding groove according to claim 1, characterized in that: On the bottom plane of the unit assembly (1) and the unit chamber floor (4), there are an upper hook plate (5-1) and a lower hook plate (5-2) that are hooked and matched with each other up and down. When the unit assembly (1) enters the connection travel, the upper hook plate (5-1) and the lower hook plate (5-2) are in the combined state of being hooked and matched up and down. When the unit assembly (1) moves to the front end point of the movement travel, the upper hook plate (5-1) and the lower hook plate (5-2) are in the separated state.

8. The functional unit of the low-voltage complete equipment guided and positioned through the chute according to claim 1, characterized in that: The chute (2-1) is specifically provided by the guide rail (2), and the sliding member is specifically a cylindrical sliding column (3).

9. The functional unit of the low-voltage complete set of equipment guided and positioned through the sliding groove according to claim 8, characterized in that: The guide rail (2) has a protruding upper plane. The chute (2-1) is opened on the upper plane of the guide rail (2). On the upper plane, there is also a protruding rib (2-2) extending along the movement direction of the unit assembly (1). The guide rail (2) supports the movement of the unit assembly (1) through the rib (2-2).

10. The functional unit of the low-voltage complete set of equipment guided and positioned through the sliding groove according to claim 1, characterized in that: Both ends of the described sliding groove (2-1) are closed and are used to cooperate with the front and rear two sliding members respectively to limit the moving stroke of the unit assembly (1).

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