Mechanical interlocking device for dual power supply load switching switch

Abstract

The present invention relates to a medium-voltage electrical switchgear, and discloses a mechanical interlocking device for a dual-power-supply load switch. An interlocking crank arm is pivotally connected to a plate surface of a fixed plate away from an operating box, and a first sensing crank arm and a second sensing crank arm are respectively extended from both ends of the interlocking crank arm; an interlocking baffle is pivotally connected to a plate surface of a mounting plate close to the fixed plate, and a first baffle plate and a second baffle plate are respectively extended from both ends of the interlocking baffle, and the first baffle plate and the second baffle plate correspond to a first operating hole and a second operating hole respectively; a first avoidance groove and a second avoidance groove are respectively arranged below the first baffle plate and the second baffle plate. In addition to having a mechanical interlock between two load switch main shafts, the mechanical interlocking device for the dual-power-supply load switch of the present invention is also provided with an interlock on the operating hole of the operating mechanism. When the operating mechanism of one load switch is in a closed state, the operating hole of the operating mechanism of the other load switch is blocked and the operating rod cannot be inserted, thereby avoiding damage to the operating mechanism due to misoperation.

Description

Technical Field

[0001] The invention relates to a medium voltage electrical switch device, in particular to a mechanical interlocking device for a dual power supply load switching switch. Background Art

[0002] In the power grid, there are many users who have high requirements for power supply reliability, such as coal mines and oil refineries. Once a power outage occurs in these units, it will cause significant economic losses to the units and even cause casualties. Therefore, in the power supply systems of these units, both main power supply and backup power supply are required. When the main power supply fails, the backup power supply must be immediately put into use to restore power supply. In order to achieve the above purpose, it is necessary to switch between the main power supply and the backup power supply through a dual power supply switching mechanism.

[0003] The mechanical interlock of the traditional dual power switching mechanism (i.e. dual power switching load switch) generally adopts the mechanical interlock between the main shafts of the two load switches. When one load switch is in the closed state, the operating rod of the operating mechanism of the other load switch cannot be closed. However, if the operating rod is forcibly inserted into the operating hole for operation, it will cause damage to the operating mechanism, so there is still room for improvement. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a mechanical interlocking device for a dual-power supply load switch. In addition to the mechanical interlocking between the main shafts of the two load switches, an interlocking is also provided on the operating hole of the operating mechanism, that is, when the operating mechanism of one load switch is in a closed state, the operating hole of the operating mechanism of the other load switch is blocked and the operating rod cannot be inserted, thereby avoiding damage to the operating mechanism due to misoperation.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] A mechanical interlocking device for a dual power supply load switch includes an operating box with a first load switch and a second load switch installed, a first operating mechanism and a second operating mechanism for driving the first load switch and the second load switch to operate are installed on the outer side of the operating box, a first operating panel and a second operating panel are installed on the front side of the first operating mechanism and the second operating mechanism, a first operating hole and a second operating hole are opened on the first operating panel and the second operating panel, the first load switch and the second load switch are respectively provided with a first main shaft and a second main shaft, and the first main shaft and the second main shaft are connected to each other. The end of the main shaft is rotatably penetrated through the outer side wall of the operation box; the ends of the first main shaft and the second main shaft beyond the outer side wall of the operation box are respectively connected with the first connecting shaft and the second connecting shaft which are coaxially arranged, and the outer peripheral surfaces of the first connecting shaft and the second connecting shaft are respectively provided with the first switch crank arm and the second switch crank arm; a fixing plate is installed on the outer side wall of the operation box, and the fixing plate is pivotally connected with an interlocking crank arm away from the plate surface of the operation box, and the first sensing crank arm and the second sensing crank arm are respectively extended from both ends of the interlocking crank arm, and the first sensing crank arm and the second sensing crank arm are respectively located above the first switch crank arm and the second switch crank arm;

[0007] A mounting plate is arranged at intervals on one side of the interlocking crank arm away from the operating box, and an interlocking baffle is pivotally connected to the plate surface of the mounting plate close to the fixed plate, and a first baffle and a second baffle are respectively extended at both ends of the interlocking baffle, and the first baffle and the second baffle correspond to the first operating hole and the second operating hole respectively; a first avoidance groove and a second avoidance groove are respectively opened below the first baffle and the second baffle; a synchronous connecting rod is arranged between the interlocking crank arm and the interlocking baffle.

[0008] Preferably, a reset assembly for maintaining the interlocking crank arm in a horizontal state is provided on the plate surface of the fixed plate near the mounting plate, the reset assembly includes a driving rod located at the pivot point of the interlocking crank arm and extending downward, a shift rod extending vertically at the end of the driving rod, and clamping rods that cross and pivotally connect with each other are clamped on both sides of the shift rod, and linkage rods that cross each other are extended to both sides at the tail ends of the two clamping rods, and the lower ends of the two linkage rods extend downward and maintain a gap, and an elastic member is connected between the tail ends of the two linkage rods to make the two linkage rods tend to approach each other.

[0009] Preferably, the elastic member is a tension spring, and both ends of the tension spring are respectively fixed to the tail ends of the two linkage rods.

[0010] Preferably, the first switch crank arm comprises a first driving arm which is arranged on the outer peripheral surface of the first connecting shaft and is arranged opposite to each other, and a gap is maintained between the two first driving arms for the first sensing crank arm to be inserted; a first roller assembly is arranged between the ends of the two first driving arms;

[0011] The second switch crank arm includes a second driving arm arranged on the outer peripheral surface of the second connecting shaft and arranged opposite to each other, and a gap is maintained between the two second driving arms for the second sensing crank arm to be inserted; a second roller assembly is arranged between the ends of the two second driving arms.

[0012] Preferably, the first roller assembly comprises a first roller disposed between the ends of two first driving arms, both end faces of the first roller are provided with first rotating shafts extending vertically outward, and the two first driving arms are provided with first shaft holes respectively provided near the ends for the two first rotating shafts to rotate through;

[0013] The second roller assembly includes a second roller arranged between the ends of two second driving arms, and the two end faces of the second roller both have second rotating shafts extending vertically outward. The two second driving arms are each provided with second shaft holes near the ends for the two second rotating shafts to rotate through.

[0014] Preferably, two synchronous connecting rods are provided and are arranged on both sides of the pivot point of the interlocking crank arm.

[0015] The present invention has significant technical effects due to the adoption of the above technical scheme: when one of the load switches is actuated, the switch crank arm on the main shaft of the load switch can lift the sensing crank arm on the corresponding side, so that the interlocking crank arm can tilt to the other side, thereby causing the sensing crank arm on the other side to be pressed down and abutted against the switch crank arm on the other side, so as to lock the load switch corresponding to the switch crank arm on the other side, so that the other load switch cannot be actuated; at the same time, the interlocking baffle relative to the interlocking crank arm is synchronously tilted under the drive of the synchronous connecting rod, so that the avoidance groove of the raised part of the interlocking baffle plate is facing the corresponding operating hole on the side, so that the operating rod can be inserted into the operating hole for operation; at the same time, the baffle of the pressed part of the interlocking baffle plate blocks the operating hole on the other side, so that the operating rod cannot be inserted into the operating hole, thereby avoiding misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of this embodiment is shown in FIG. Figure 1 ;

[0017] Figure 2 is an exploded view of this embodiment;

[0018] Figure 3 The structure of this embodiment is shown in FIG. Figure 2 ;

[0019] Figure 4 The structure of this embodiment is shown in FIG. Figure 3 ;

[0020] Figure 5 for Figure 4 An enlarged schematic diagram of section A is shown;

[0021] Figure 6 The structure of this embodiment is shown in FIG. Figure 4 ;

[0022] Figure 7 for Figure 6 An enlarged schematic diagram of portion B is shown;

[0023] Figure 8 This is a state diagram of the present embodiment. Figure 1 ;

[0024] Fig. 9 This is a state diagram of the present embodiment. Figure 2 ;

[0025] Fig.10 This is a state diagram of the present embodiment. Figure 3 ;

[0026] Fig.11 This is a state diagram of the present embodiment. Figure 4 ;

[0027] Fig.12 This is a state diagram of the present embodiment. Figure 5 ;

[0028] Fig.13 This is a state diagram of the present embodiment. Figure 6 .

[0029] The parts indicated by the numbers in the above drawings are as follows: 1. operation box; 2. first operation mechanism; 3. second operation mechanism; 4. first operation panel; 5. second operation panel; 6. first operation hole; 7. second operation hole; 8. first connecting shaft; 9. second connecting shaft; 10. first switch arm; 11. second switch arm; 12. fixing plate; 13. interlocking arm; 14. first sensing arm; 15. second sensing arm; 16. mounting plate; 17. Interlocking baffle; 18. First baffle; 19. Second baffle; 22. First avoidance groove; 23. Second avoidance groove; 24. Synchronous connecting rod; 25. Reset assembly; 26. Drive rod; 27. Push rod; 28. Clamp rod; 29. ​​Linkage rod; 30. Elastic member; 31. First drive arm; 32. Second drive arm; 33. First roller; 34. First rotating shaft; 35. First shaft hole; 36. Second roller; 37. Second rotating shaft; 38. Second shaft hole. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figures 1 to 7As shown, the mechanical interlocking device of a dual power supply load switch disclosed in this embodiment includes an operating box 1 on which a first load switch (not shown) and a second load switch (not shown) are installed. The outer side of the operating box 1 is installed with a first operating mechanism 2 and a second operating mechanism 3 for driving the first load switch (not shown) and the second load switch (not shown) to act, respectively. The front sides of the first operating mechanism 2 and the second operating mechanism 3 are respectively installed with a first operating panel 4 and a second operating panel 5. The first operating panel 4 and the second operating panel 5 are respectively provided with a first operating hole 6 and a second operating hole 7 for operation by an operating rod. The first load switch (not shown) and the second load switch (not shown) are respectively provided with a first main shaft (not shown) and a second main shaft (not shown), and the ends of the first main shaft (not shown) and the second main shaft (not shown) are rotatably penetrated through the outer side wall of the operating box 1. The above structure belongs to the common knowledge in the art and will not be described in detail here.

[0032] Furthermore, the ends of the first main shaft (not shown) and the second main shaft (not shown) beyond the outer wall of the operation box 1 are respectively connected with the first connecting shaft 8 and the second connecting shaft 9 which are coaxially arranged, and the outer peripheral surfaces of the first connecting shaft 8 and the second connecting shaft 9 are respectively provided with the first switch arm 10 and the second switch arm 11, so that the first switch arm 10 and the second switch arm 11 can rotate synchronously with the first main shaft (not shown) and the second main shaft (not shown). A fixing plate 12 is installed on the outer wall of the operation box 1, and the fixing plate 12 is installed on the outer wall of the operation box 1 by screws (not shown). The fixing plate 12 is pivotally connected with an interlocking arm 13 away from the plate surface of the operation box 1, and the interlocking arm 13 is preferably arranged horizontally and pivotally connected to the fixing plate 12 by screws, and the first sensing arm 14 and the second sensing arm 15 are respectively extended from the two ends of the interlocking arm 13, and the first sensing arm 14 and the second sensing arm 15 are respectively located above the first switch arm 10 and the second switch arm 11.

[0033] Furthermore, a mounting plate 16 is provided at a distance from one side of the interlocking crank arm 13 away from the operating box 1, and both ends of the mounting plate 16 are fixed to the first operating panel 4 and the second operating panel 5 respectively by screws (not shown). An interlocking baffle 17 is pivotally connected to the plate surface of the mounting plate 16 close to the fixed plate 12, and the interlocking baffle 17 is preferably arranged horizontally and is preferably pivotally connected to the plate surface of the mounting plate 16 by screws. A first baffle 18 and a second baffle 19 are extended from both ends of the interlocking baffle 17, and the first baffle 18 and the second baffle 19 correspond to the first operating hole 6 and the second operating hole 7 respectively; a first avoidance groove 22 and a second avoidance groove 23 are respectively provided below the first baffle 18 and the second baffle 19. A synchronous link 24 is arranged between the interlocking crank arm 13 and the interlocking baffle 17. Two synchronous links 24 are arranged on both sides of the pivot point of the interlocking crank arm 13, so that the interlocking crank arm 13 can drive the interlocking baffle 17 to move more stably, thereby improving the operation efficiency of the equipment.

[0034] In this embodiment, the first switch crank arm 10 includes a first driving arm 31 which is arranged on the outer peripheral surface of the first connecting shaft 8 and is arranged opposite to each other. A gap is maintained between the two first driving arms 31 for the first sensing crank arm 14 to be embedded. A first roller assembly is arranged between the ends of the two first driving arms 31. More specifically, the first roller assembly includes a first roller 33 which is arranged between the ends of the two first driving arms 31. Both end surfaces of the first roller 33 have first rotating shafts 34 extending vertically outward, and the two first rotating shafts 34 are symmetrically arranged. The two first driving arms 31 are provided with first shaft holes 35 respectively for the two first rotating shafts 34 to rotate through at positions close to the ends. The two first shaft holes 35 are arranged opposite to each other, so that the first roller 33 can perform stable circumferential rotation between the two first driving arms 31 with the first rotating shaft 34 as the center, and the outer peripheral surface of the first roller 33 exceeds the end of the first driving arm 31.

[0035] Correspondingly, the second switch arm 11 includes a second driving arm 32 which is arranged on the outer peripheral surface of the second connecting shaft 9 and is arranged opposite to each other, and a gap is maintained between the two second driving arms 32 for the second sensing arm 15 to be embedded; a second roller assembly is arranged between the ends of the two second driving arms 32; more specifically, the second roller assembly includes a second roller 36 which is arranged between the ends of the two second driving arms 32, and the two end surfaces of the second roller 36 are vertically extended outward with a second rotating shaft 37, and the two second rotating shafts 37 are symmetrically arranged; the two second driving arms 32 are provided with second shaft holes 38 respectively for the two second rotating shafts 37 to rotate through at positions close to the ends, and the two second shaft holes 38 are arranged opposite to each other, so that the second roller 36 can stably rotate circumferentially between the two second driving arms 32 with the second rotating shaft 37 as the center, and the outer peripheral surface of the second roller 36 exceeds the end of the second driving arm 32.

[0036] Furthermore, the fixing plate 12 is provided with a reset assembly 25 for the interlocking crank arm 13 to maintain a horizontal state on the plate surface near the mounting plate 16. The reset assembly 25 includes a driving rod 26 located at the pivot point of the interlocking crank arm 13 and extending downward. The end of the driving rod 26 is vertically extended with a lever 27, and the lever 27 is arranged in a direction close to the position of the interlocking baffle 17. The two sides of the lever 27 are clamped with mutually crossed and pivoted clamping rods 28, that is, the two clamping rods 28 are arranged in a cross-overlapping manner, and the two are preferably pivoted by screws, so that the clamping angle between the two clamping rods 28 can be changed. The tail ends of the two clamping rods 28 extend to both sides with mutually crossed linkage rods 29, and the lower ends of the two linkage rods 29 extend downward and maintain a gap. An elastic member 30 is connected between the tail ends of the two linkage rods 29 so that the two linkage rods 29 have a tendency to approach each other. In this embodiment, the elastic member 30 is a tension spring, and the two ends of the tension spring are respectively fixed to the tail ends of the two linkage rods 29.

[0037] The specific working principle of the mechanical interlocking device of the dual power supply load switching switch is as follows:

[0038] like Figure 8 and Fig. 9 As shown, the state position of the interlocking arm 13 and the interlocking baffle 17 when the first operating mechanism 2 and the second operating mechanism 3 are both in the open state. At this time, the interlocking arm 13 remains in a horizontal state, the first sensing arm 14 does not abut against the first switch arm 10, and the second sensing arm 15 does not abut against the second switch arm 11, so that the first load switch (not shown) and the second load switch (not shown) are both in an unlocked state, and the interlocking baffle 17 is also in a horizontal state, so that the first avoidance groove 22 and the second avoidance groove 23 can be respectively opposite to the first operating hole 6 and the second operating hole 7. At this time, the user can insert the operating rod (not shown) into the first operating hole 6 or the second operating hole 7 to operate the first operating mechanism 2 or the second operating mechanism 3, so as to achieve the closing of the first operating mechanism 2 or the second operating mechanism 3.

[0039] like Fig.10 and Fig.11 As shown, the state position of the interlocking crank arm 13 and the interlocking baffle plate 17 when the first operating mechanism 2 is closed and the second operating mechanism 3 is opened. When the first operating mechanism 2 is closed, the first switch crank arm 10 rotates counterclockwise to lift the first sensing crank arm 14 on the interlocking crank arm 13, so that the interlocking crank arm 13 tilts to the other side, thereby driving the second sensing crank arm 15 on the interlocking crank arm 13 to support the second switch crank arm 11, so that the second main shaft of the second load switch is locked, so that the second load switch cannot operate, and the second load switch is prevented from closing. At the same time, driven by the synchronous connecting rod 24, the interlocking baffle plate 17 and the interlocking crank arm 13 are tilted synchronously, so that the first avoidance groove 22 is opposite to the first operating hole 6, and the user can insert the operating rod into the first operating hole 6 to operate the first operating mechanism 2; at the same time, the second baffle plate 19 blocks the second operating hole 7, so that the user cannot insert the operating rod into the second operating hole 7, to avoid misoperation.

[0040] like Fig.12 and Fig.13As shown, the state position of the interlocking crank arm 13 and the interlocking baffle plate 17 when the first operating mechanism 2 is open and the second operating mechanism 3 is closed. When the second operating mechanism 3 is closed, the second switch crank arm 11 rotates counterclockwise to lift the second sensing crank arm 15 on the interlocking crank arm 13, so that the interlocking crank arm 13 tilts to the other side, thereby driving the first sensing crank arm 14 on the interlocking crank arm 13 to support the first switch crank arm 10, so that the first main shaft of the first load switch is locked, so that the first load switch cannot be operated, and the first load switch is prevented from closing. At the same time, driven by the synchronous connecting rod 24, the interlocking baffle plate 17 and the interlocking crank arm 13 are tilted synchronously, so that the second avoidance groove 23 is opposite to the second operating hole 7, and the user can insert the operating rod into the second operating hole 7 to operate the second operating mechanism 3; at the same time, the first baffle plate 18 blocks the first operating hole 6, so that the user cannot insert the operating rod into the first operating hole 6 to avoid misoperation.

[0041] When one of the load switches is in the closed state, the interlocking arm 13 is tilted, so the driving rod 26 on the interlocking arm 13 is also tilted accordingly, causing the lever 27 on the driving rod 26 to shift position, so as to push the clamping rod 28 on one side outward, so that the two linkage rods 29 can expand outward by overcoming the elastic force of the elastic member 30.

[0042] If the load switch is to be switched, the load switch currently in the closed state must be opened first. Insert the operating rod into the operating hole corresponding to the closed load switch and open the load switch. At this time, the switch arm corresponding to the load switch on this side rotates clockwise to move away from the sensing arm on the corresponding side. Under the pulling force of the elastic member 30, the two linkage rods 29 approach each other and drive the two clamping rods 28 to move together to move the lever 27 to the middle position, thereby driving the driving rod 26 to reset, so as to drive the interlocking arm 13 back to the horizontal position, so that the mechanical interlocking device is restored to the state when the first operating mechanism 2 and the second operating mechanism 3 are both in the open state.

Claims

1. A mechanical interlocking device for a dual power supply load switch, comprising an operating box (1) on which a first load switch and a second load switch are installed, a first operating mechanism (2) and a second operating mechanism (3) for driving the first load switch and the second load switch to operate are installed on the outer side of the operating box (1), a first operating panel (4) and a second operating panel (5) are installed on the front side of the first operating mechanism (2) and the second operating mechanism (3), respectively, a first operating hole (6) and a second operating hole (7) are opened on the first operating panel (4) and the second operating panel (5), respectively, characterized in that: The first load switch and the second load switch are respectively provided with a first main shaft and a second main shaft, and the ends of the first main shaft and the second main shaft are rotatably arranged to penetrate the outer wall of the operation box (1); the ends of the first main shaft and the second main shaft beyond the outer wall of the operation box (1) are respectively connected to a first connecting shaft (8) and a second connecting shaft (9) which are coaxially arranged, and the outer peripheral surfaces of the first connecting shaft (8) and the second connecting shaft (9) are respectively provided with a first switch crank arm (10) and a second switch crank arm (11); a fixing plate (12) is installed on the outer wall of the operation box (1), and an interlocking crank arm (13) is pivotally connected to the fixing plate (12) away from the plate surface of the operation box (1), and a first sensing crank arm (14) and a second sensing crank arm (15) are respectively extended from both ends of the interlocking crank arm (13), and the first sensing crank arm (14) and the second sensing crank arm (15) are respectively located above the first switch crank arm (10) and the second switch crank arm (11); A mounting plate (16) is arranged at a distance from one side of the interlocking crank arm (13) away from the operating box (1); an interlocking baffle (17) is pivotally connected to the plate surface of the mounting plate (16) close to the fixed plate (12); a first baffle (18) and a second baffle (19) are respectively extended from both ends of the interlocking baffle (17); the first baffle (18) and the second baffle (19) correspond to the first operating hole (6) and the second operating hole (7) respectively; a first avoidance groove (22) and a second avoidance groove (23) are respectively opened below the first baffle (18) and the second baffle (19); a synchronous connecting rod (24) is arranged between the interlocking crank arm (13) and the interlocking baffle (17); A reset assembly (25) for maintaining the interlocking crank arm (13) in a horizontal state is arranged on the plate surface of the fixing plate (12) near the mounting plate (16), and the reset assembly (25) comprises a driving rod (26) located at the pivot point of the interlocking crank arm (13) and extending downward, a shifting rod (27) extending vertically from the end of the driving rod (26), and clamping rods (28) intersecting and pivotally connected are clamped on both sides of the shifting rod (27), and mutually intersecting linkage rods (29) are extended to both sides at the tail ends of the two clamping rods (28), and the lower ends of the two linkage rods (29) are extended downward and kept at a distance, and an elastic member (30) is connected between the tail ends of the two linkage rods (29) so that the two linkage rods (29) have a tendency to approach each other; The first switch crank arm (10) comprises first drive arms (31) arranged on the outer peripheral surface of the first connecting shaft (8) and arranged opposite to each other, a gap is maintained between the two first drive arms (31) for the first sensing crank arm (14) to be inserted; a first roller assembly is arranged between the ends of the two first drive arms (31); The second switch crank arm (11) comprises a second drive arm (32) which is arranged on the outer peripheral surface of the second connecting shaft (9) and is arranged opposite to each other, and a gap is maintained between the two second drive arms (32) for the second sensing crank arm (15) to be inserted; a second roller assembly is arranged between the ends of the two second drive arms (32); The first roller assembly comprises a first roller (33) arranged between the ends of two first driving arms (31), both end surfaces of the first roller (33) are provided with first rotating shafts (34) extending vertically outward, and the two first driving arms (31) are provided with first shaft holes (35) at positions close to the ends for the two first rotating shafts (34) to rotate through respectively; The second roller assembly comprises a second roller (36) arranged between the ends of two second driving arms (32), and two end surfaces of the second roller (36) are provided with second rotating shafts (37) extending vertically outward, and the two second driving arms (32) are provided with second shaft holes (38) at positions close to the ends for the two second rotating shafts (37) to rotate through.

2. The mechanical interlocking device of the dual power supply load switching switch according to claim 1 is characterized in that: The elastic member (30) is a tension spring, and two ends of the tension spring are respectively fixed to the tail ends of the two linkage rods (29).

3. The mechanical interlocking device of the dual power supply load switching switch according to claim 1 is characterized in that: Two synchronous connecting rods (24) are provided and are respectively arranged on both sides of the pivot point of the interlocking crank arm (13).

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