Medium-voltage circuit breaker handcart electric external mechanism execution unit box door locking mechanism

Abstract

The invention relates to the technical field of power equipment, in particular to a medium-voltage circuit breaker handcart electric plug-in mechanism execution unit box door locking mechanism which comprises a box body, the box body is a medium-voltage circuit breaker handcart electric plug-in mechanism execution unit box, and a box door is arranged on the box body; a first locking unit is mounted on the box body, a second locking unit is mounted on the box door, a lock pin is mounted in the first locking unit, and a lock rod is mounted in the second locking unit; in the operation process of the box body, if a locking assembly fails, namely an electromagnetic plate and an electromagnetic block are powered off at the same time, the electromagnetic plate and a protective sleeve rotate downwards to initial positions under the elastic force action of a fourth spring, but a first gear cannot be driven to rotate, namely after the electromagnetic plate loses the locking function on a lock rod, an abutting plate still abuts against the lower portion of the lock rod, and the lock rod is prevented from overturning; and the box door is prevented from being opened by a worker during operation of the box body when the locking assembly is out of order.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly to a door locking mechanism for the unit box of the electric external hanging mechanism of a medium-voltage circuit breaker handcart. Background Art

[0002] A circuit breaker handcart is a mobile equipment unit carrying a circuit breaker. The circuit breaker is an important part of the power system, and its main function is to protect the power system from damage caused by abnormal conditions such as current overload and short circuit.

[0003] In the prior art, the door of the unit box of the electric external hanging mechanism of a medium-voltage circuit breaker handcart is locked by an electromagnetic lock structure to prevent the unit box from being accidentally opened by staff during use, thus avoiding electric shock.

[0004] However, the electromagnetic lock may malfunction after long-term use, that is, the magnetic force of the electromagnetic lock disappears. At this time, the electromagnetic lock cannot lock the unit box, which is likely to cause potential safety hazards. Summary of the Invention

[0005] The purpose of the present invention is to provide a door locking mechanism for the unit box of the electric external hanging mechanism of a medium-voltage circuit breaker handcart to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A door locking mechanism for the unit box of the electric external hanging mechanism of a medium-voltage circuit breaker handcart, comprising:

[0008] A box body, which is the unit box of the electric external hanging mechanism of a medium-voltage circuit breaker handcart, and a door is provided on the box body.

[0009] A first locking unit is installed on the box body, a second locking unit is installed on the door, a locking pin is installed in the first locking unit, and a locking rod is installed in the second locking unit.

[0010] The positioning structure of the locking rod and the locking pin controls the opening and closing of the door on the box body.

[0011] A magnetic plate is provided below the locking rod, and an electromagnetic plate is provided below the magnetic plate. The electromagnetic plate is magnetically connected to the magnetic plate after being powered on to prevent the door from being opened when the box body is powered on.

[0012] Further, a lock pin is slidably connected within the first locking unit. A first telescopic rod is provided on one side of the lock pin facing the side wall of the first locking unit. The lock pin is horizontally slidably connected to the first locking unit through the first telescopic rod. A first spring is further provided between the lock pin and the first locking unit. One end of the first spring is fixedly connected to the lock pin, and the other end of the first spring is fixedly connected to the inner wall of the first locking unit.

[0013] Further, a chute is provided below the side of the lock pin away from the first locking unit. A first positioning pin is vertically slidably connected within the chute. A second spring is provided above the first positioning pin. One end of the second spring is fixedly connected to the first positioning pin, and the other end of the second spring is fixedly connected to the inner wall of the chute.

[0014] Further, a first connecting rope is further provided above the first positioning pin. The first connecting rope completely penetrates through the lock pin, and a roller is rotatably connected within the lock pin. The first connecting rope passes above the roller. One side of the first connecting rope extending out of the lock pin extends below the first locking unit, and the end of this side of the first connecting rope is wound around a winding wheel. The winding wheel is rotatably connected to the first locking unit, and a keyhole is fixedly connected to the central part of the winding wheel.

[0015] Further, the lock rod is provided in an L shape. The middle part of the lock rod is rotatably installed within the second locking unit through a shaft, and one end of the shaft passes through the cabinet door and is connected to a rotating handle. A third spring is provided above the side of the lock rod away from the first locking unit. One end of the third spring is fixedly connected to the inner wall of the second locking unit, and the other end of the third spring is fixedly connected to the lock rod. A lock head is fixedly connected to the side of the lock rod facing the lock pin, and a second positioning pin is fixedly connected above the lock head.

[0016] Further, the lock pin and the lock head have the same shape, and both are provided in a trapezoidal shape. The upper side of the side of the lock pin facing the lock head is provided as an inclined side, and the lower side of the side of the lock head facing the lock pin is provided as an inclined side, and the slopes of both inclined sides are the same. The side of the first positioning pin facing the inclined side of the lock pin and the side of the second positioning pin facing the inclined side of the lock head are also provided with inclined sides having the same slope.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention realizes the locking function of the unit box through the magnetic connection structure between the electromagnetic plate and the magnetic plate, and through the limitation of the sliding distance of the electromagnetic plate, so that the magnetic plate and the locking rod cannot rotate. At the same time, during the upward sliding process of the electromagnetic plate, through the limiting structure of the positioning rod and the spiral groove of the protective sleeve, the protective sleeve rotates during the upward movement, and the first gear drives the second gear to rotate, controlling the pressing plate to abut against the lower side of the other side of the locking rod to prevent the locking rod from rotating, realizing double insurance for locking the unit box;

[0019] 2. During the operation of the box body, if the locking component fails, that is, the electromagnetic plate and the electromagnetic block are powered off at the same time, under the elastic force of the fourth spring, the electromagnetic plate and the protective sleeve rotate downward to the initial position, but cannot drive the first gear to rotate. That is, after the electromagnetic plate loses the locking function of the locking rod, the pressing plate still abuts against the lower part of the locking rod to prevent it from flipping, avoiding the situation where the staff opens the box door during the operation of the box body when the locking component fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0021] Figure 2 is a schematic diagram of the locking structure of the present invention;

[0022] Figure 3 is of the present invention Figure 2 amplified structure schematic diagram at A in;

[0023] Figure 4 is a sectional structure schematic diagram of the locking structure of the present invention;

[0024] Figure 5 is of the present invention Figure 4 amplified structure schematic diagram at B in;

[0025] Figure 6 is of the present invention Figure 5 amplified structure schematic diagram at C in;

[0026] Figure 7 is of the present invention Figure 4 amplified structure schematic diagram at D in;

[0027] Figure 8 is a sectional structure schematic diagram of the protective sleeve of the present invention;

[0028] Figure 9 is of the present invention Figure 8 amplified structure schematic diagram at E in.

[0029] In the figure: 1. Box body; 2. Box door; 21. Rotating handle; 22. Keyhole; 3. First locking unit; 4. Second locking unit; 5. Lock pin; 51. First telescopic rod; 52. First spring; 53. Roller; 6. First positioning pin; 61. Second spring; 62. First connecting rope; 63. Winding wheel; 7. Lock rod; 71. Third spring; 72. Lock head; 73. Second positioning pin; 74. Magnetic plate; 8. Electromagnetic plate; 81. Fixed column; 82. First lifting column; 83. Fourth spring; 84. Protective sleeve; 85. Rotating shaft; 86. Spiral groove; 87. Positioning rod; 88. Second telescopic rod; 89. Electromagnetic block; 810. First gear; 9. Baffle plate; 91. Second lifting column; 92. Lead screw; 93. Second gear. Detailed implementation mode

[0030] To more clearly illustrate the overall concept of the present invention, the following will be further described in detail by way of examples in conjunction with the accompanying drawings of the specification.

[0031] Please refer to Figures 1 to 8 , the present invention provides a technical solution: a door locking mechanism for the execution unit of a medium-voltage circuit breaker handcart electric external hanging mechanism, including a box body 1, the box body 1 is a box for the execution unit of a medium-voltage circuit breaker handcart electric external hanging mechanism, and a box door 2 is provided on the box body 1;

[0032] The opening or closing of the box body 1 is controlled by the box door 2.

[0033] A first locking unit 3 is installed on the box body 1, a second locking unit 4 is installed on the box door 2, a lock pin 5 is installed in the first locking unit 3, and a lock rod 7 is installed in the second locking unit 4;

[0034] The positioning structure of the lock rod 7 and the lock pin 5 controls the opening and closing of the box door 2 on the box body 1;

[0035] The lock rod 7 is positioned with the lock pin 5, so that the first locking unit 3 and the second locking unit 4 are positioned and fixed to each other. Moreover, the first locking unit 3 is installed on the box body 1, and the second locking unit 4 is installed on the box door 2, thereby realizing the fixation between the box door 2 and the box body 1.

[0036] A magnetic plate 74 is provided below the lock rod 7, and an electromagnetic plate 8 is provided below the magnetic plate 74. After the electromagnetic plate 8 is energized, it is magnetically connected to the magnetic plate 74, preventing the box door 2 from being opened when the box body 1 is energized.

[0037] Through the magnetic connection between the electromagnetic plate 8 and the magnetic plate 74, after restricting the position of the electromagnetic plate 8, the rotation of the lock rod 7 is restricted, thereby preventing the box door 2 from being accidentally opened by the staff during the energized operation of the box body 1, causing an electric shock hazard.

[0038] A lock pin 5 is slidably connected inside the first locking unit 3. One side of the lock pin 5 facing the side wall of the first locking unit 3 is provided with a first telescopic rod 51. The lock pin 5 is horizontally slidably connected to the first locking unit 3 through the first telescopic rod 51. A first spring 52 is further provided between the lock pin 5 and the first locking unit 3. One end of the first spring 52 is fixedly connected to the lock pin 5, and the other end of the first spring 52 is fixedly connected to the inner wall of the first locking unit 3.

[0039] Through the structure of the first telescopic rod 51, it is ensured that the lock pin 5 only maintains horizontal sliding and there will be no position change in the vertical direction. Under the elastic force of the first spring 52, the lock pin 5 always has a tendency to move away from the first locking unit 3 without external force.

[0040] A chute is provided below one side of the lock pin 5 away from the first locking unit 3. A first positioning pin 6 is vertically slidably connected inside the chute. A second spring 61 is provided above the first positioning pin 6. One end of the second spring 61 is fixedly connected to the first positioning pin 6, and the other end of the second spring 61 is fixedly connected to the inner wall of the chute.

[0041] Through the structure of the chute, the first positioning pin 6 can slide on the lock pin 5 and can be completely retracted into the lock pin 5. Without external force, the second spring 61 exerts a downward force on the first positioning pin 6, causing the first positioning pin 6 to pop out downward from the lock pin 5.

[0042] A first connecting rope 62 is further provided above the first positioning pin 6. The first connecting rope 62 completely penetrates through the lock pin 5, and a roller 53 is rotatably connected inside the lock pin 5. The first connecting rope 62 passes above the roller 53. One side of the first connecting rope 62 passing out of the lock pin 5 extends to the lower part of the first locking unit 3. The end of this side of the first connecting rope 62 is wound around a winding wheel 63. The winding wheel 63 is rotatably connected to the first locking unit 3, and a keyhole 22 is fixedly connected to the central part of the winding wheel 63.

[0043] Insert the key into the keyhole 22 and rotate it, causing the keyhole 22 to drive the winding wheel 63 to rotate, that is, the first connecting rope 62 is wound around the winding wheel 63, causing the first connecting rope 62 to contract towards the winding wheel 63. First, pull the first positioning pin 6 upward until the first positioning pin 6 is completely retracted into the lock pin 5. At this time, the first connecting rope 62 continues to contract downward, causing the lock pin 5 to slide away from the second locking unit 4;

[0044] Through the structure of the roller 53, the part of the first connecting rope 62 inside the locking pin 5 is supported to prevent it from wearing against the locking pin 5. At the same time, the force applied by the first connecting rope 62 is better decomposed to pull the first positioning pin 6 and the locking pin 5 to move.

[0045] The lock lever 7 is arranged in an L shape. The middle part of the lock lever 7 is rotatably installed in the second locking unit 4 through a shaft, and one end of the shaft passes through the door 2 and is connected to the rotating handle 21. A third spring 71 is arranged above the side of the lock lever 7 away from the first locking unit 3. One end of the third spring 71 is fixedly connected to the inner wall of the second locking unit 4, and the other end of the third spring 71 is fixedly connected to the lock lever 7. A lock head 72 is fixedly connected to the side of the lock lever 7 facing the locking pin 5, and a second positioning pin 73 is fixedly connected above the lock head 72.

[0046] Under the elastic force of the third spring 71, the lock lever 7 rotates counterclockwise without external force and remains in this position to facilitate the opening and closing of the door 2 on the box body 1.

[0047] The locking pin 5 and the lock head 72 have the same shape, and both are trapezoidal. The upper side of the locking pin 5 facing the lock head 72 is set as an inclined side, and the lower side of the lock head 72 facing the locking pin 5 is set as an inclined side, and the slopes of the two inclined sides are the same. The inclined side of the first positioning pin 6 facing the inclined side of the locking pin 5 and the inclined side of the second positioning pin 73 facing the inclined side of the lock head 72 are also provided with inclined sides with the same slope.

[0048] Through the corresponding inclined side structure of the locking pin 5 and the lock head 72, when the lock head 72 rotates towards the locking pin 5, the locking pin 5 is squeezed, causing the locking pin 5 to slide in a direction away from the lock head 72 until the lock head 72 can rotate to the lower side of the locking pin 5. After the lock head 72 rotates to the lower side of the locking pin 5, under the elastic force of the first spring 52, the locking pin 5 slides to the upper side of the lock head 72. Since the first positioning pin 6 can retract into the locking pin 5, and the corresponding inclined sides are also provided on the sides where the first positioning pin 6 and the second positioning pin 73 move towards each other, the second positioning pin 73 squeezes the first positioning pin 6 to contract. After the second positioning pin 73 passes through the first positioning pin 6, the first positioning pin 6 pops downwards and is engaged with the second positioning pin 73.

[0049] A first lifting column 82 is fixedly connected below the electromagnetic plate 8. The first lifting column 82 is arranged inside a fixed column 81 and is vertically slidably connected to the fixed column 81. Wires electrically connected to the electromagnetic plate 8 are arranged inside the first lifting column 82. A fourth spring 83 is arranged below the first lifting column 82. The upper part of the fourth spring 83 is fixedly connected to the first lifting column 82, and the lower part of the fourth spring 83 is fixedly connected to the inner wall of the fixed column 81.

[0050] During the operation of the box body 1, electricity is conducted into the electromagnetic plate 8, causing the electromagnetic plate 8 to move towards the magnetic plate 74. When the box body 1 and the box door 2 are closed, the lock rod 7 remains horizontal, causing the electromagnetic plate 8 to drive the first lifting column 82 to slide upwards. When the box body 1 is closed, the electromagnetic plate 8 loses its magnetic force, and under the elastic force of the fourth spring 83, the first lifting column 82 drives the electromagnetic plate 8 to slide downwards to the initial position.

[0051] A rotating shaft 85 is arranged on the outer wall above the first lifting column 82. The first lifting column 82 is rotationally connected to a protective sleeve 84 through the rotating shaft 85. The inner side of the protective sleeve 84 is made of insulating material. The inner diameter of the protective sleeve 84 is larger than the outer diameter of the fixed column 81. A spiral groove 86 is arranged on the outer wall of the protective sleeve 84. A positioning rod 87 is fixedly connected to the inner wall of the second locking unit 4. The end of the positioning rod 87 is engaged in the spiral groove 86. During the up and down movement of the first lifting column 82, the positioning rod 87 drives the protective sleeve 84 to rotate.

[0052] During the up and down sliding of the first lifting column 82, the protective sleeve 84 slides up and down with it. Since the positioning rod 87 slides in the spiral groove 86, the protective sleeve 84 rotates during the up and down sliding process.

[0053] A number of second telescopic rods 88 are fixedly connected below the protective sleeve 84. The movable ends of the second telescopic rods 88 are fixedly connected with an electromagnetic block 89. A first gear 810 is rotatably installed on the outer side below the fixed column 81. A magnet is arranged on the upper surface of the first gear 810. The electromagnetic block 89 is magnetically connected to the magnet on the upper surface of the first gear 810.

[0054] After the electromagnetic plate 8 is electrified, the electromagnetic block 89 is also electrified synchronously. When the protective sleeve 84 rotates, it drives the first gear 810 to rotate following the rotation of the protective sleeve 84. Due to the structure of the second telescopic rods 88, when the protective sleeve 84 rises to the high position, the electromagnetic block 89 can still be magnetically connected to the magnet on the first gear 810.

[0055] On one side of the first gear 810, a second gear 93 is provided. The second gear 93 is in meshing transmission with the first gear 810. The second gear 93 is arranged below the lock rod 7. A lead screw 92 is fixedly connected to the upper center of the second gear 93. A second lifting column 91 is sleeved above the lead screw 92. The inner wall of the second lifting column 91 is in threaded connection with the lead screw 92. And a limiting component for the sliding of the second lifting column 91 is arranged in the second locking unit 4. The upper end of the second lifting column 91 is fixedly connected with a pressing plate 9. The pressing plate 9 abuts against the lower side of the side of the lock rod 7 close to the inner wall of the second locking unit 4.

[0056] When the first lifting column 82 rises, the rotation of the first gear 810 drives the second gear 93 to rotate synchronously, so that the lead screw 92 rotates. And due to the limiting component of the second locking unit 4 for the second lifting column 91, the lead screw 92 and the second lifting column 91 rotate relative to each other, that is, the second lifting column 91 rises, and the pressing plate 9 abuts against the lower part of the lock rod 7 to prevent the lock rod 7 from flipping. When the first lifting column 82 descends, the pressing plate 9 slides downward, enabling the lock rod 7 to flip.

[0057] During the operation of the box body 1, if the locking component fails, that is, the electromagnetic plate 8 and the electromagnetic block 89 are both powered off, under the elastic force of the fourth spring 83, the electromagnetic plate 8 and the protective sleeve 84 rotate downward to the initial position, but cannot drive the first gear 810 to rotate, that is, the pressing plate 9 still abuts against the lower part of the lock rod 7 to prevent it from flipping, avoiding that when the locking component fails, the staff opens the box door 2 during the operation of the box body 1.

[0058] The present invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A door locking mechanism for the execution unit of the electric external hanging mechanism of a medium-voltage circuit breaker handcart, characterized in that, include: A box body (1), the box body (1) being an execution unit box of an electric external mechanism of a medium-voltage circuit breaker trolley, and a box door (2) is arranged on the box body (1); A first locking unit (3) is installed on the box body (1), a second locking unit (4) is installed on the box door (2), a locking pin (5) is installed in the first locking unit (3), and a locking rod (7) is installed in the second locking unit (4); The positioning structure of the locking rod (7) and the locking pin (5) controls the opening and closing of the box door (2) on the box body (1); A magnetic plate (74) is arranged below the locking rod (7), and an electromagnetic plate (8) is arranged below the magnetic plate (74). The electromagnetic plate (8) is magnetically connected to the magnetic plate (74) after power is turned on, so as to prevent the box door (2) from still being able to be opened after the box body (1) is powered on.

2. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 1, characterized in that, The locking pin (5) is slidably connected inside the first locking unit (3), a first telescopic rod (51) is provided on one side of the locking pin (5) facing the side wall of the first locking unit (3), and the locking pin (5) is horizontally slidably connected to the first locking unit (3) via the first telescopic rod (51).

3. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 2, characterized in that, A first spring (52) is also provided between the locking pin (5) and the first locking unit (3); one end of the first spring (52) is fixedly connected to the locking pin (5), and the other end of the first spring (52) is fixedly connected to the inner wall of the first locking unit (3).

4. The door locking mechanism of the medium-voltage circuit breaker handcart electric external execution unit box according to claim 3, characterized in that A slide groove is arranged below the side of the lock pin (5) away from the first locking unit (3), and a first positioning pin (6) is vertically slidably connected in the slide groove. A second spring (61) is arranged above the first positioning pin (6), one end of the second spring (61) is fixedly connected to the first positioning pin (6), and the other end of the second spring (61) is fixedly connected to the inner wall of the slide groove.

5. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 4, characterized in that A first connecting rope (62) is also provided above the first positioning pin (6), and the first connecting rope (62) completely penetrates the locking pin (5). A roller (53) is rotatably connected inside the locking pin (5), and the first connecting rope (62) passes above the roller (53).

6. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 5, characterized in that, The first connecting rope (62) passes through one side of the locking pin (5) and extends to the bottom of the first locking unit (3). The end of the first connecting rope (62) is wound on a winding wheel (63). The winding wheel (63) is rotatably connected to the first locking unit (3). The axial part of the winding wheel (63) is fixedly connected to the keyhole (22).

7. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 6, characterized in that, The locking rod (7) is configured to be L-shaped, the middle portion of the locking rod (7) is rotatably mounted in the second locking unit (4) via an axis, one end of the axis passes through the door (2) and is connected to a rotating handle (21), and a third spring (71) is provided above a side of the locking rod (7) away from the first locking unit (3).

8. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 7, characterized in that, One end of the third spring (71) is fixedly connected to the inner wall of the second locking unit (4), and the other end of the third spring (71) is fixedly connected to the locking rod (7). A lock head (72) is fixedly connected to one side of the locking rod (7) facing the locking pin (5), and a second positioning pin (73) is fixedly connected above the lock head (72).

9. The door locking mechanism of the medium-voltage circuit breaker trolley electric external hanging mechanism execution unit according to claim 8, characterized in that, The locking pin (5) and the lock head (72) have the same shape, and both are trapezoidal. The upper side of the locking pin (5) facing the lock head (72) is set as an inclined side.

10. The door locking mechanism of the medium-voltage circuit breaker handcart electric external hanging mechanism execution unit according to claim 9, characterized in that, The lower side of the lock head (72) facing the locking pin (5) is set as an inclined side, and the slopes of the inclined sides of both are the same. The inclined side of the first positioning pin (6) facing the inclined side of the locking pin (5) and the inclined side of the second positioning pin (73) facing the inclined side of the lock head (72) are also provided with inclined sides having the same slope.

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