Door locking device for double doors of low-voltage switch cabinet
By designing a low-voltage switch cabinet double-open door lock device combining cylindrical locks and sliding lock plates, the safety hazards and working space problems of the door locking method on the back of the low-voltage switch cabinet are solved, and safe and reliable operation and effective working space are achieved. Avoid the risk of equipment short circuit and electric shock.
Patent Information
- Application Number
- CN202310843354.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-11
- Publication Date
- 2025-01-14
AI Technical Summary
The double-open door locking method on the back of the low-voltage switch cabinet has safety hazards and hinders of operation, including equipment short circuits caused by unreliability of the upper and lower locking levers and accidents of the inability to open the equipment rear door, as well as the reduction in effective working space caused by the separation of neutral columns and the close hand distance. The risk of electric shock caused.
A low-voltage switch cabinet double-open door locking device is designed, using a combination of cylindrical lock, corner plate, self-tapping screw, self-locking nut, step bolt, connecting rod, sliding lock plate and lock hook, through hinging and sliding lock plate Designed to achieve automatic locking and safe and reliable opening process, combined with the rotary locking mechanism of the cylindrical lock to ensure the coherent operation and safety of the door.
It realizes safe and reliable operation of double-opening doors on the back of the low-voltage switch cabinet, avoids equipment short circuits and electric shock accidents, takes into account the effectiveness and safety of the working space, and meets the production, installation and maintenance needs.
Smart Images
Figure CN119308554A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of low-voltage switch cabinets, and in particular to a double-door locking device for low-voltage switch cabinets. The invention also belongs to the technical field of low-voltage distribution boxes. Background Art
[0002] Low-voltage switchgear (also known as low-voltage complete switchgear and control equipment) is a combination of one or more low-voltage switchgear and related control, measurement, signal, protection, regulation and other equipment, as well as all internal electrical and mechanical connections and structural components. It is widely used in low-voltage power distribution systems in power plants, substations, industrial and mining enterprises, civil buildings and other industries.
[0003] Low-voltage switch cabinets usually have maintenance passages at the back. To save floor space, the width of the maintenance passage at the back is required to be as narrow as possible while ensuring the normal safety of relevant national standards. However, due to functional configuration requirements, the common width of low-voltage switch cabinets is between 600mm and 1200mm. When the cabinet width exceeds 600mm, in order to ensure that the back door can be opened normally and that the staff can pass normally behind the cabinet when it is open, the back door of the low-voltage switch cabinet is usually made into a double-door structure that opens left and right. This can reduce the floor space occupied by the door by half, retain as much space as possible for the staff to move around, and reduce unnecessary reserved space.
[0004] The double doors of the low-voltage switch cabinet rear doors are divided into the following three types due to different locking methods: Type a. Single door frame structure at the back of the cabinet, double doors are locked to the upper and lower beams at the back of the cabinet using upper and lower connecting rods; Type b. Double door frame structure at the back of the cabinet, with each double door locked on the center column with a cylindrical lock; Type c. Single door frame structure at the rear of the cabinet, one door is fixed to the upper and lower beams at the rear of the cabinet with a latch lock on the back, and the other door is locked to the door with a cylindrical lock.
[0005] Type A door locking method has a spacious and unobstructed space behind the cabinet, and a large working range for personnel inside the cabinet. It has been widely used. For example, the original designs of domestic GCS, GGD and other low-voltage switch cabinets all adopt this door locking method. However, with the large-scale commissioning of such products, it was found that the hinge (or crimping or pin fixation) between the upper and lower locking rods and the lock body during the opening or locking process was unreliable. After long-term use, the equipment short circuit accidents caused by the upper and lower locking rods falling off and the equipment rear door failure caused by the lower locking rod falling off are increasing. Although some lock suppliers have added a redundant insurance by increasing the number of locking rod fixing points, they cannot fundamentally eliminate such accidents.
[0006] Type B locking method is reliable and has no safety hazards. For example, Schneider BlokSeT low-voltage switchgear adopts this type of locking method. However, due to the installation of a neutral column behind the cabinet, the door frame behind the cabinet is divided into double door frames on the left and right, and the space of a single door frame is reduced, which reduces the effective working space. This hinders the normal operation of the staff during the production in the factory and the on-site installation and maintenance of the product.
[0007] Although the type C locking method takes into account the advantages of types A and B, when there is a live part in the upper rear part of the cabinet, when a person reaches behind the door to lock or open the latch lock, the hand is very close to the live part, which may cause a risk of electric shock. Therefore, it cannot be fully universally used.
[0008] Therefore, for the double doors on the back of the low-voltage switch cabinet, a new door locking device needs to be designed to completely solve the above safety hazards and work obstruction problems. Summary of the invention
[0009] The purpose of the present invention is to provide a double-door locking device for a low-voltage switch cabinet, which completely solves the safety hazards and work obstruction problems of the double-door locking method on the back of the low-voltage switch cabinet in the production, installation and maintenance links.
[0010] To achieve the above purpose, the technical solution of the double-door locking device for low-voltage switch cabinet of the present invention is as follows: Figure 5 As shown, a double-door locking device for a low-voltage switch cabinet includes [the quantity not specified in the subsequent description is 1 piece]: a cylindrical lock, an angle plate, a self-tapping screw [4 pieces], a self-locking nut [4 pieces], a step bolt (I) [3 pieces], a connecting rod, a step bolt (II) [1 piece], a sliding lock plate, and a lock hook.
[0011] Figure 4 , Figure 5 , Figure 7 As shown, the horizontal plane of the angle plate is hinged to the connecting rod through the self-locking nut and the step bolt (I), and the connecting rod is hinged to the sliding lock plate through the self-locking nut and the step bolt (II). The sliding groove of the sliding lock plate also passes through the journal of the two step bolts (I), and the two step bolts (I) are fixed to the rear lower cross beam through the self-locking nut.
[0012] Figure 1 , Figure 4 , Figure 6 As shown, the vertical surface of the angle plate is fixed to the rear door (I) by two self-tapping screws, and the rear door (I) is fixed to the C-shaped column by a hinge. The C-shaped column [two pieces in total, one on each side] together with the rear lower crossbeam and the rear upper crossbeam constitute the rear door frame, and the rear door frame is one of the components of the cabinet.
[0013] Figure 4, Figure 5 , Figure 7 As shown, the lock hook is fixed to the rear door (II) by two self-tapping screws, and the rear door (II) is fixed to the C-shaped column of the rear door frame by a hinge.
[0014] Figure 1 , Figure 5 , Fig.10 As shown, the cylindrical lock is fixed on the rear door (I).
[0015] The double-door locking device for low-voltage switch cabinet of the present invention has the beneficial effect that the cabinet body adopts a single door frame structure at the rear of the cabinet, and after the rear door (II) is closed, the rear door (I) automatically locks the rear door (II) during the closing process, and the cylindrical lock is rotated to lock the rear door (I). The opposite is true for opening the door. The entire closing and opening process of the double-door is continuous, in line with the custom, safe and reliable, and at the same time, the door locking device is simple to manufacture and meets the requirements of mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is the axonometric view of the back of the low-voltage switchgear in this case; Figure 2 This is a three-dimensional cross-sectional view of the lower part of the low-voltage switchgear in this case; Figure 3 For this case, the low voltage switchgear Figure 2 Rotated view of Figure 4 For this case, the low voltage switchgear Figure 3 A partial cross-sectional view at position I in the middle; Figure 5 It is an assembly diagram of the device of the present invention separated from the case application; Figure 6 for Figure 4 A partial enlarged view of position II in the middle; Figure 7 for Figure 4 A partial enlarged view of the part at III in the middle; Figure 8 This is the back view of the cabinet in this case when the rear double doors are open; Fig. 9 This is the back view of the cabinet in this case when only the rear door (II) is closed; Fig.10 This is the back view of the cabinet in this case when both rear doors are closed; Fig.11 for Figure 8 A cross-sectional view of Fig.12 for Fig. 9 A cross-sectional view of Fig.13 for Fig.12 Cross-sectional view of the middle rear door (I) when closed at 45°; Fig.14 for Fig.12 Cross-sectional view of the middle rear door (I) when closed at 30°; Fig.15 for Fig.10 A cross-sectional view of Fig.16 for Fig.12 A partial magnified view of the middle V; Fig.17 for Fig.13 A partial enlarged view of the center VI; Fig.18 for Fig.14 A partial enlarged view at VII in the middle; Fig.19 for Fig.15 A magnified view of the part at position VIII.
[0017] In the figure: 1. cabinet body; 101. rear door (I); 102. rear door (II); 103. rear lower beam; 104. C-shaped column; 105. hinge (I); 106. hinge (II); 107. rear upper beam.
[0018] 2. Door locking device; 201. Angle plate; 202. Connecting rod; 203. Sliding lock plate; 204. Lock hook; 205. Cylindrical lock; 206. Self-locking nut; 207. Step bolt (I); 208. Step bolt (II); 209. Self-tapping screw. Implementation
[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0020] The specific embodiment of the double-door locking device for low-voltage switch cabinet of the present invention is as follows: Figures 1 to 19 As shown (Note: In order to facilitate readers to understand the present invention more intuitively and accurately, Figures 1 to 7 The three-dimensional view expression method is adopted, focusing on explaining the assembly relationship between various parts; Figures 8 to 19 The present invention adopts a plan view expression method, focusing on expressing the dynamic trajectory between various components). The present invention provides a double-door locking device for a low-voltage switch cabinet, which is used to completely solve the safety hazards and work obstruction problems of the double-door locking method on the back of the low-voltage switch cabinet in the production, installation, and maintenance. The embodiment of the present invention has been Figure 1 The prototype shown has been verified and achieved the expected effect. The specific implementation is as follows: Figure 5 As shown, a double-door locking device 2 for a low-voltage switch cabinet includes [the quantity not specified in the subsequent description is 1 piece]: an angle plate 201, a connecting rod 202, a sliding lock plate 203, a lock hook 204, a cylindrical lock 205, a self-locking nut 206 [4 pieces], a step bolt (I) 207 [3 pieces], a step bolt (II) 208, and a self-tapping screw 209 [4 pieces].
[0021] Figure 4 , Figure 5 , Figure 7 As shown, the horizontal plane of the angle plate 201 is hinged to the connecting rod 202 through the self-locking nut 206 and the step bolt (I) 207, and the connecting rod 202 is hinged to the sliding lock plate 203 by passing through the sliding groove of the rear lower cross beam 103 through the self-locking nut 206 and the step bolt (II) 208, and both ends of the connecting rod 202 form a hinge pair; the sliding groove of the sliding lock plate 203 also passes through the journal of the two step bolts (I) 207, and the two step bolts (I) 207 are fixed to the rear lower cross beam 103 through the self-locking nut 206. The two step bolts (I) 207 and the self-locking nut 206 are used here for safety and redundancy to prevent the constraint point of the sliding lock plate 203 from failing at any place, and the sliding lock plate 203 still has reliable guidance to prevent unpredictable movement trajectories from causing equipment and personal safety accidents. The sliding lock plate 203 can slide left and right in the rear lower cross beam 103 under the drive of the connecting rod 202 .
[0022] Figure 1 , Figure 4 , Figure 6 As shown, the vertical surface of the angle plate 201 is fixed to the rear door (I) 101 by two self-tapping screws 209, and the rear door (I) 101 is fixed to the C-shaped column 104 by a hinge 105. The C-shaped column 104 [two pieces on each side] together with the rear lower cross beam 103 and the rear upper cross beam 107 constitute a rear door frame, which is one of the components of the cabinet 1.
[0023] The cabinet 1 is equivalent to the base, the rear door (I) 101 is equivalent to the crank, the connecting rod 202 is equivalent to the connecting rod, and the sliding lock plate 203 is equivalent to the slider. The three constitute a standard crank slider mechanism.
[0024] Figure 4 , Figure 5 , Figure 7As shown, the lock hook 204 is fixed to the rear door (II) 102 by two self-tapping screws 209, and the rear door (II) 102 is fixed to the C-shaped column 104 of the rear door frame by hinges 106. The rear door (II) 102 is locked and unlocked by the sliding lock plate 203 by limiting the movement of the lock hook 204.
[0025] Figure 1 , Figure 4 , Fig.10 As shown, the cylindrical lock 205 is fixed on the rear door (I) 101. When the rear door (II) 102 is closed, the rear door (I) 101 is closed, and the lock tongue attachment behind the cylindrical lock 205 is rotated to hook the back of the door gap baffle of the rear door (II) 102 [the door gap baffle is fixed to the rear door (II) 102 with screws to form a whole], thereby completing the locking function of the double door of the cabinet 1.
[0026] The dynamic trajectory of closing the double door is specifically analyzed as follows: Fig.12 , Fig.16 As shown in the figure, the rear door (I) 101 is in the fully open position, the connecting rod 202 drives the sliding lock plate 203 to the left through the hinge points at both ends, and is completely disengaged from the lock hook 204 that passes through the vertical hole of the rear lower cross beam 103, and the rear door (II) 102 can be closed and opened freely. As shown in the figure, the rear door (II) 102 is in the closed and opened state. In fact, as long as the closing angle of the rear door (I) 101 is greater than 45°, it will not affect the free closing and opening of the rear door (II) 102; Fig.13 , Fig.17 As shown in the figure, the rear door (II) 102 is in the fully closed position, the rear door (I) 101 is in the 45° closed state, and the connecting rod 202 drives the sliding lock plate 203 to move rightward through the hinge points at both ends. At this time, if the rear door (II) 102 is close to but not fully closed [as shown in the double-dotted line position of the rear door (II) 102 in the figure, this situation is very common in actual operation], the sliding lock plate 203 is in contact with the lock hook 204 as the rear door (I) 101 continues to close the door, and the connecting rod 202 drives the sliding lock plate 203 to continue to move rightward through the hinge points at both ends, generating a horizontal thrust Fh [even if the horizontal thrust Fh is large, according to the mechanical properties of the standard crank slider mechanism and the lever, the impact on the closing force of the human hand is not very obvious and can be ignored], which is decomposed into a thrust Fv inward of the cabinet through the hypotenuse of the lock hook 204, pushing the lock hook 204 to move inward of the cabinet, thereby driving the rear door (II) 102 to continue closing.
[0027] Fig.14 , Fig.18As shown in , when the rear door (I) 101 continues to close to 30°, the sliding lock plate 203 has completely passed the bevel of the lock hook 204, and the rear door (II) 102 is just in the critical state of being completely closed. The push force Fv inwardly caused by the bevel of the lock hook 204 disappears, and the rear door (I) 101 continues to close more easily.
[0028] Fig.15 , Fig.19 As shown in the figure, the rear door (I) 101 has been completely closed, the sliding lock plate 203 has been completely and reliably stuck to the straight edge of the lock hook 204 and has a redundant safety, and the rear door (II) 102 has been reliably closed. At this time, the cylindrical lock 205 is rotated and the lock tongue attachment behind it will hook the back of the door gap baffle of the rear door (II) 102 [the door gap baffle is fixed to the rear door (II) 102 with screws to form a whole], and the rear door (I) 101 is completely closed.
[0029] The opening dynamic trajectory of the double door is vice versa and will not be described again.
[0030] In the above-mentioned low-voltage switch cabinet door lock device of the present invention, in the application introduction of this embodiment, only the application example of the bottom of the double door is introduced in detail, but in actual use, a door lock device is also installed above the double door and arranged symmetrically with the door lock device below the double door, and it is not repeated here. It is just that the number of the cylindrical locks 205 will be adjusted according to the height of the door and will not be less than 1, but it will not affect the performance of the present invention.
Claims
1. As shown in FIG5 , the door locking device 2 includes [the quantity not specified in the subsequent description is 1 piece]: an angle plate 201, a connecting rod 202, a sliding lock plate 203, a lock hook 204, a cylindrical lock 205, a self-locking nut 206 [4 pieces], a step bolt (I) 207 [3 pieces], a step bolt (II) 208, and a self-tapping screw 209 [4 pieces].
2. As shown in FIG. 4 and FIG. 6, according to the door locking device of claim 1, the vertical surface of the angle plate 201 is fixed to the rear door (I) 101 by two self-tapping screws 209, and the rear door (I) 101 is fixed to the C-shaped column 104 by a hinge 105. It is characterized by: The rear door (I) 101 is equivalent to the "crank" in a standard crank slider mechanism.
3. The door locking device according to claim 1 further includes as shown in Fig. 4, Fig. 5 and Fig. 7, the horizontal plane of the angle plate 201 is hinged to the connecting rod 202 through the self-locking nut 206 and the step bolt (I) 207, the connecting rod 202 is hinged to the sliding lock plate 203 through the self-locking nut 206 and the step bolt (II) 208 passing through the slide groove of the rear lower cross beam 103, and both ends of the connecting rod 202 form a hinge pair; the slide groove of the sliding lock plate 203 also passes through the journal of the two step bolts (I) 207, and the two step bolts (I) 207 are fixed to the rear lower cross beam 103 through the self-locking nut 206. It is characterized by: Together with the rear door (I) 101, a standard crank slider mechanism is formed, and the principle construction of the door locking device is completed by following its motion trajectory and mechanical characteristics.
4. According to the door locking device of claim 3, the sliding groove of the sliding lock plate 203 also passes through the two step bolts (I) 207 and the self-locking nut 206, and the sliding lock plate 203 can slide left and right in the rear lower cross beam 103 under the drive of the connecting rod 202. It is characterized in that: The two step bolts (I) 207 and the self-locking nuts 206 are redundant backups for safety, to prevent any failure of the constraint points of the sliding lock plate 203. The sliding lock plate 203 still has reliable guidance to prevent unpredictable movement trajectories from causing equipment and personal safety accidents.
5. The door locking device according to claim 1 further comprises, as shown in FIG. 4, FIG. 5 and FIG. 7, the lock hook 204 is fixed to the rear door (II) 102 by two self-tapping screws 209, and the rear door (II) 102 is fixed to the C-shaped column 104 of the rear door frame by a hinge 106. The sliding lock plate 203 restricts the movement of the lock hook 204 to achieve locking and unlocking of the rear door (II) 102. Features: The rear door (II) 102 is locked by the lock hook 204 and the closing and opening of the lock hook 204 are restricted by the left and right movement of the sliding lock plate 203 .
6. The door locking device according to claim 1 further comprises as shown in Fig. 1, Fig. 4 and Fig. 10, the cylindrical lock 205 is fixed on the rear door (I) 101, when the rear door (II) 102 is closed, the rear door (I) 101 is closed, the locking tongue attachment behind the cylindrical lock 205 is rotated, and the back side of the door gap baffle of the rear door (II) 102 [the door gap baffle is fixed to the rear door (II) 102 with screws to form a whole] is hooked, and the locking function of the double door of the cabinet 1 is completed. It is characterized by: After the low-pressure switch, the closing and opening of the double door are ultimately restricted only by the cylindrical lock 205, and other intermediate processes are automatically and continuously completed.