CN117672761A - Accurate positioning mechanism of direct-acting type three-station switch - Google Patents
Accurate positioning mechanism of direct-acting type three-station switch Download PDFInfo
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- CN117672761A CN117672761A CN202410146408.3A CN202410146408A CN117672761A CN 117672761 A CN117672761 A CN 117672761A CN 202410146408 A CN202410146408 A CN 202410146408A CN 117672761 A CN117672761 A CN 117672761A
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Abstract
The accurate positioning mechanism of the direct-acting three-station switch comprises a frame, wherein an output shaft and a main operation shaft are installed on the frame, the main operation shaft is fixedly connected with a gear and an interlocking wheel, and a first notch and a second notch are formed in the edge of the interlocking wheel; the frame is also provided with a first interlocking shaft and a second interlocking shaft, the front end of the first interlocking shaft is fixedly connected with a first pawl, and the front end of the second interlocking shaft is fixedly connected with a second pawl; the first pawl and the second pawl are positioned above the gear; the rear end fixedly connected with first pendulum block of first interlocking axle, the rear end fixedly connected with second pendulum block of second interlocking axle, first bayonet lock of first pendulum block fixedly connected with, second bayonet lock of second pendulum block fixedly connected with, first pendulum block, first bayonet lock and first pawl swing in step around the central axis of first interlocking axle. The invention can ensure the close contact between the moving contact and the fixed contact, and can avoid the axial collision between the moving contact and the fixed contact driven by the screw rod and avoid damaging the fixed contact or the moving contact.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a precise positioning mechanism of a direct-acting three-position switch.
Background
A switching device in an electric power system is provided with an isolating switch and a grounding switch. The disconnecting switch is closed for the next step of power transmission operation, and the grounding switch is closed for the next step of safety maintenance operation. Thus, the disconnector and the earthing switch must form the following latching relationship: the earthing switch cannot be closed when the isolating switch is closed, and the isolating switch cannot be closed when the earthing switch is closed. The disconnecting switch and the grounding switch of the traditional switch equipment are respectively and independently arranged, and in order to realize the locking relation, the electric interlocking is generally required to be used for control, but the electric interlocking has the problem of low reliability.
Later, direct-acting three-position switches were designed. The direct-acting three-position switch is provided with three fixed contacts and one movable contact 30, wherein the three fixed contacts are a grounding contact 31, a middle fixed contact 32 and an isolating contact 33 in sequence, as shown in fig. 1, 2, 3 and 4, the three fixed contacts are arranged on the same straight line and are all in a cylinder structure, the movable contact 30 is in a round bar shape, and the movable contact is driven by a screw rod mechanism to linearly move in a cylinder cavity of the three fixed contacts to switch the switch state. The direct-acting three-station switch can be manually operated, and the manual operation is realized by using the rotation of the operating handle to drive the operating shaft to rotate, and the operating shaft drives the screw rod to rotate through the gear set.
The movable contact of the direct-acting three-position switch is provided with three working positions, namely a grounding position, a switching-off position and a switching-on position, which are sequentially arranged at two ends, and the switching-off position is arranged in the middle. The movable contact is in a grounding position as shown in fig. 2, the movable contact 30 connects the grounding contact 31 with the middle fixed contact 32, which is equivalent to the closing of a grounding switch, and the disconnecting switch is opened, so that the safety of an maintainer can be ensured; the movable contact is in the opening position as shown in fig. 3, and the movable contact 30 only contacts the middle fixed contact 32 and does not contact the grounding contact 31 or the isolating contact 33, which is equivalent to that the isolating switch and the grounding switch are in the opening state; as shown in fig. 4 and 1, when the movable contact is in the closing position, the movable contact 30 connects the isolation contact 33 and the intermediate fixed contact 32, which corresponds to closing of the isolation switch, and the grounding switch is opened, and this position can reliably pass the working current. The direct-acting three-position switch really integrates the functions of the isolating switch and the grounding switch, and the position of the moving contact is unique at a certain moment, so that the simultaneous closing state of the grounding switch and the isolating switch is absolutely impossible, and the internal locking relation that the grounding switch cannot be closed when the isolating switch is closed and the grounding switch cannot be closed when the isolating switch is closed is completely ensured.
However, the conventional direct-acting three-position switch operating mechanism has the following defects: since the actual moving position of the moving contact cannot be observed from the outside, the moving position of the moving contact cannot be controlled accurately easily. Particularly, when the movable contact is required to move to a grounding position or a switching-off position, if the movable contact is not moved in place, incomplete switch contact can be caused; on the contrary, if the movable contact is moved to the grounding position or the opening position, force is needed to drive the movable contact to move through the screw rod until the movable contact and the fixed contact collide axially, and the movable contact can not be sensed to be in place at the moment through the resistance of the handle, but due to the characteristic of the screw rod, even a small torque can generate a large axial thrust (for example, a common screw rod jack utilizes the characteristic), the fixed contact or the movable contact is easily damaged by the large axial thrust, and the movable contact or the fixed contact is deformed and shifted over time.
Disclosure of Invention
The invention aims to overcome the defects and provide the accurate positioning mechanism of the direct-acting three-position switch, which not only can ensure that a moving contact is in close contact with a fixed contact, but also can prevent a screw rod from driving the moving contact to axially collide with the fixed contact and avoid damaging the fixed contact or the moving contact.
The aim can be achieved according to the following scheme: the three fixed contacts are sequentially a grounding contact, a middle fixed contact and an isolating contact, the three fixed contacts are arranged on the same straight line and are all in a cylindrical structure, and the moving contact is in a round bar shape and is driven by a screw rod mechanism to move linearly between cylinder cavities of the three fixed contacts so as to switch the state; the movable contact is provided with three working positions, namely a grounding position, a switching-off position and a switching-on position in sequence; the movement of the moving contact from the closing position to the opening position and the movement from the opening position to the grounding position are called as forward movement of the moving contact, and the movement of the moving contact from the grounding position to the opening position and the movement from the opening position to the closing position are called as reverse movement of the moving contact;
the positioning mechanism comprises a frame, wherein the frame is provided with an output shaft and a main operation shaft, and the main operation shaft and the output shaft are positioned on the same straight line and fixedly connected to synchronously rotate; the output shaft drives the screw rod mechanism through a speed change gear set; the clockwise rotation of the main operation shaft drives the movable contact to move forward;
the device is characterized in that a gear and an interlocking wheel are fixedly connected with a main operation shaft, two notches are arranged at the edge of the interlocking wheel, and the two notches are a first notch and a second notch respectively; the frame is also provided with a first interlocking shaft and a second interlocking shaft, the second interlocking shaft is loosely sleeved outside the first interlocking shaft, and the first interlocking shaft and the second interlocking shaft can rotate relatively; the first interlocking shaft and the second interlocking shaft are positioned above the main operation shaft; the front end of the first interlocking shaft is fixedly connected with a first pawl, and the front end of the second interlocking shaft is fixedly connected with a second pawl; the first pawl and the second pawl are positioned above the gear;
the rear end of the first interlocking shaft is fixedly connected with a first swinging block, the rear end of the second interlocking shaft is fixedly connected with a second swinging block, the first swinging block is fixedly connected with a first bayonet lock, the second swinging block is fixedly connected with a second bayonet lock, the first bayonet lock is positioned on the left side of the first interlocking shaft, and the second bayonet lock is positioned on the right side of the second interlocking shaft; the first torsion spring is used for applying anticlockwise torque to the first interlocking shaft, and the second torsion spring is used for applying clockwise torque to the second interlocking shaft;
the first swing block, the first bayonet lock and the first pawl swing synchronously around the central axis of the first interlocking shaft; when the main operation shaft drives the movable contact to move to the grounding position, the first notch of the interlocking wheel rotates to a position aligned with the first bayonet, the torsion of the first torsion spring enables the first bayonet to be embedded into the first notch of the interlocking wheel, and the first pawl is embedded into the tooth slot of the gear to limit the gear to rotate clockwise;
the second swing block, the second bayonet lock and the second pawl swing synchronously around the central axis of the second interlocking shaft; when the main operation shaft drives the moving contact to move to the closing position, the second notch of the interlocking wheel rotates to a position aligned with the second bayonet, the torsion force of the second torsion spring enables the second bayonet to be embedded into the second notch of the interlocking wheel, and the second pawl is embedded into the tooth slot of the gear to limit the gear to rotate anticlockwise.
The structures of the first notch and the second notch are symmetrical and identical; each notch of the interlocking wheel is provided with a notch bottom and two notch side walls, the two notch side walls are respectively called a radial wall and an inclined wall, the extending direction of the radial wall is the radial direction of the interlocking wheel, and the extending direction of the inclined wall and the radial direction of the interlocking wheel form an oblique intersection; the inclined wall is divided into two sections, the first section of inclined wall is close to the edge of the interlocking wheel, and the second section of inclined wall is close to the bottom of the notch;
each notch is correspondingly provided with a swinging piece, a swinging shaft of the swinging piece is arranged in the edge area of the interlocking wheel, and the swinging piece comprises an arc-shaped splicing part and a swinging main body which are fixedly connected into a whole; the longitudinal position of the arc-shaped splicing part is overlapped with the longitudinal position of the interlocking wheel, and the longitudinal position of the swinging main body is staggered with the longitudinal position of the interlocking wheel; the arc splicing part is provided with an outer side surface with an arc shape on one surface and two inner side surfaces; the swing piece is provided with a first torsion spring which is used for applying torsion to the swing piece, and the torsion direction of the first torsion spring is that the arc-shaped splicing part of the swing piece is pushed to the direction of the inclined wall close to the notch of the interlocking wheel; when the swinging piece is in a normal position under the torsion action of the third torsion spring, the outer side face of the arc-shaped splicing part is spliced with the outer peripheral edge of the interlocking wheel to form a continuous smooth arc shape, the inner side face of the first face of the arc-shaped splicing part is pressed on the first section inclined wall of the notch, and an acute angle is formed between the inner side face of the second face of the arc-shaped splicing part and the second section inclined wall of the notch.
In this application, the extending direction of the main operation shaft is taken as the longitudinal direction.
The invention has the following advantages and effects:
1. when the main operation shaft rotates clockwise to drive the moving contact to move to the grounding position, the first notch of the interlocking wheel rotates to a position aligned with the first bayonet lock, the first bayonet lock is embedded into the first notch of the interlocking wheel, and the first pawl is embedded into the tooth slot of the gear to limit the gear to rotate clockwise continuously, so that the main operation shaft can be prevented from continuously pushing the moving contact to strongly press the end face of the grounding contact; when the main operation shaft rotates anticlockwise to drive the moving contact to move to the closing position, the second notch of the interlocking wheel rotates to a position aligned with the second bayonet lock, the second bayonet lock is embedded into the second notch of the interlocking wheel, the second pawl is embedded into the tooth slot of the gear to limit the gear to rotate anticlockwise continuously, and therefore the main operation shaft can be prevented from continuously pushing the moving contact to forcefully press the end face of the isolation contact. Therefore, the moving contact can be accurately positioned in the operation process, the moving contact can be ensured to be accurately positioned at the grounding position or the closing position, the moving contact fixed contact (the isolating contact or the grounding contact) can be ensured to be in close contact, the moving contact and the fixed contact driven by the screw rod can be prevented from being subjected to axial strong compression and collision, and the fixed contact and the moving contact are prevented from being damaged.
2. When the moving contact is about to reach the grounding position (but not really and completely reach the grounding position), and the first bayonet lock is about to fall into the first notch of the edge of the interlocking wheel under the action of the first torsion spring, although the direction of the inclined wall of the first notch is aligned with the first bayonet lock, because the outer side surface of the arc splicing part is spliced with the outer peripheral edge of the interlocking wheel to form a continuous smooth arc shape, the first bayonet lock slides along the outer side surface of the arc splicing part (the first bayonet lock slides relative to the arc splicing part, and actually the first bayonet lock does not move but the arc splicing part rotates), and after the moving contact really and completely reaches the grounding position, the first bayonet lock suddenly falls into the first notch instead of slowly falling into the first notch along the inclined wall, which is equivalent to the width reduction of the opening of the first notch, so that the time of the first bayonet lock falling into the first notch is more accurate, namely the time of the first pawl is limited by the tooth groove of the first embedded gear to continue clockwise rotation, and the time of the gear is more accurate, and the positioning precision of the first bayonet lock is higher. On the other hand, when the moving contact leaves the grounding position and the first bayonet lock needs to leave the first notch at the edge of the interlocking wheel, the arc-shaped splicing part of the swinging piece can be jacked up to slowly climb out along the inclined wall of the first notch, so that the first bayonet lock is prevented from being blocked due to the fact that the side wall of the first notch is too steep. In a word, the invention can avoid the low positioning precision caused by the too large opening width of the first notch, and can smoothly climb out of the first notch by utilizing the inclined wall of the first notch. The same reason is that the inclined wall of the second notch enables the second bayonet lock to climb out of the second notch smoothly, and the corresponding arc-shaped splicing part can avoid the problem that the positioning accuracy is low due to the fact that the opening width of the second notch is too large.
Drawings
Fig. 1 is a schematic perspective view of a direct-acting three-position switch.
Fig. 2 is a schematic cross-sectional view of a moving contact of a direct-acting three-position switch in a grounded position.
Fig. 3 is a schematic cross-sectional view of a moving contact of the direct-acting three-position switch in a breaking position.
Fig. 4 is a schematic cross-sectional view of a moving contact of a direct-acting three-position switch in a closed position.
Fig. 5 is a schematic perspective view of an embodiment of the present invention.
Fig. 6 is a schematic top view of an embodiment of the present invention.
Fig. 7 is a schematic diagram of an interlocking structure between a gear and an interlocking wheel according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of the structure of fig. 7 from another angle.
Fig. 9 is a schematic cross-sectional view of the structure shown in fig. 7.
Fig. 10 is a schematic elevational view of the first pendulum mass, the second pendulum mass, and the interlocking wheel of the configuration shown in fig. 7.
Fig. 11 is a schematic rear view of the first pendulum mass, second pendulum mass, and interlocking wheel of fig. 10.
Fig. 12 is an exploded perspective view of the structure shown in fig. 10.
Fig. 13 is a schematic diagram of the positional matching relationship between the interlocking wheel and the first and second bayonet locks when the moving contact is in the opening position.
Fig. 14 is a schematic diagram showing the mating relationship between the interlocking wheel and the first and second bayonet, when the moving contact is about to reach the grounding position.
Fig. 15 is an enlarged partial schematic view of fig. 14.
Fig. 16 is an exploded view of the structure shown in fig. 15.
Fig. 17 is a schematic diagram of the mating relationship between the interlocking wheel and the first and second bayonet locks when the moving contact is in the ground position.
Fig. 18 is an enlarged partial schematic view of fig. 17.
Fig. 19 is a schematic view showing the mating relationship between the interlocking wheel and the first and second bayonet just before the moving contact leaves the ground position.
Fig. 20 is an enlarged partial schematic view of fig. 19.
Fig. 21 is a schematic diagram of the cooperation relationship between the interlocking wheel and the first and second bayonet locks when the moving contact is in the closing position.
Fig. 22 is a schematic diagram of the mating relationship between the gear and the first and second pawls when the moving contact is in other positions between the grounded and closed positions.
Fig. 23 is a schematic diagram showing the mating relationship between the gear and the first and second pawls when the movable contact is in the grounded position.
Fig. 24 is a schematic diagram showing the matching relationship between the gear and the first and second pawls when the moving contact is in the closing position.
Detailed Description
The embodiment is a precise positioning mechanism of a direct-acting three-station switch; the direct-acting three-station switch is provided with three fixed contacts and one movable contact 30, as shown in fig. 1, 2, 3 and 4, the three fixed contacts are a grounding contact 31, a middle fixed contact 32 and an isolating contact 33 in sequence, the three fixed contacts are arranged on the same straight line and are all in a cylindrical structure, the movable contact is in a round bar shape, and the movable contact 30 is driven by a screw rod mechanism to linearly move between cylinder cavities of the three fixed contacts so as to switch the switch state; the moving contact is provided with three working positions, namely a grounding position, a switching-off position and a switching-on position, which are sequentially arranged at two ends, and the switching-off position is arranged in the middle. The movement of the moving contact 30 from the closing position to the opening position and the movement from the opening position to the grounding position are referred to as moving contact forward movement, and the movement of the moving contact from the grounding position to the opening position and the movement from the opening position to the closing position are referred to as moving contact reverse movement; as shown in fig. 5, 6, 7 and 8, the accurate positioning mechanism of the direct-acting three-position switch comprises a frame 4, wherein the frame 4 is provided with an output shaft 43 and a main operation shaft 41, and the main operation shaft 41 and the output shaft 43 are positioned on the same straight line and fixedly connected to synchronously rotate; the output shaft 43 drives the screw rod mechanism through a speed change gear set, and is also matched with an operation handle 40 matched with the main operation shaft, the rear end of the operation handle 40 can be movably spliced with the front end of the main operation shaft 41, and the operation handle 40 can rotate to drive the main operation shaft 41 to rotate after the rear end of the operation handle 40 is spliced with the front end of the main operation shaft 41; clockwise rotation of the main operation shaft 41 drives the moving contact to move forward, and counterclockwise rotation of the main operation shaft 41 drives the moving contact to move reversely.
As shown in fig. 7, 8, 9, 10, 11, 12, 13 and 22, the main operation shaft 41 is fixedly connected with the gear 5 and the interlocking wheel 6, and rotation of the main operation shaft 41 drives the gear 5 and the interlocking wheel 6 to synchronously rotate. The edge of the interlocking wheel 6 is provided with two notches, namely a first notch 10 and a second notch 20; the frame 4 is also provided with a first interlocking shaft 14 and a second interlocking shaft 24, the second interlocking shaft 24 is loosely sleeved outside the first interlocking shaft 14, and the first interlocking shaft and the second interlocking shaft can rotate relatively; the first interlock shaft 14 and the second interlock shaft 24 are located above the main operation shaft 41; the front end of the first interlocking shaft 14 is fixedly connected with a first pawl 15, and the front end of the second interlocking shaft 24 is fixedly connected with a second pawl 25; the first pawl 15 and the second pawl 25 are located above the gear 5; the rear end of the first interlocking shaft 14 is fixedly connected with a first swing block 1, the rear end of the second interlocking shaft 24 is fixedly connected with a second swing block 2, the first swing block 1 is fixedly connected with a first bayonet lock 11, the second swing block 2 is fixedly connected with a second bayonet lock 21, the first bayonet lock 11 is positioned on the left side of the first interlocking shaft 14, and the second bayonet lock 21 is positioned on the right side of the second interlocking shaft 24; a first torsion spring 13 for applying a counterclockwise torque to the first interlocking shaft 14, and a second torsion spring 23 for applying a clockwise torque to the second interlocking shaft 24 are also provided;
the first pendulum mass 1, the first bayonet 11 and the first pawl 15 swing synchronously around the central axis of the first interlocking shaft 14; when the main operation shaft 41 drives the movable contact 30 to move to the grounding position, the first notch 10 of the interlocking wheel 6 rotates to a position aligned with the first bayonet 11 of the first pendulum block 1, the torsion force of the first torsion spring 13 enables the first bayonet 11 to be embedded into the first notch 10 of the interlocking wheel 6, as shown in fig. 17 and 18, the first pawl 15 is embedded into the tooth slot of the gear 5 to limit the gear 5 to rotate clockwise, as shown in fig. 23;
the second swinging block 2, the second bayonet lock 21 and the second pawl 25 swing synchronously around the central axis of the second interlock shaft 24; when the main operation shaft 41 drives the moving contact 30 to move to the closing position, the second notch 20 of the interlocking wheel rotates to a position aligned with the second bayonet 21 of the second swinging block 2, the torsion force of the second torsion spring 23 makes the second bayonet 21 insert into the second notch 20 of the interlocking wheel 6, as shown in fig. 21, the second pawl 25 inserts into the tooth slot of the gear 5 to limit the gear 5 to rotate anticlockwise, as shown in fig. 24.
As shown in fig. 12, 14 and 15, the first notch 10 and the second notch 20 are symmetrical and identical in structure; each notch (referring to the first notch 10 and the second notch 20) of the interlocking wheel 6 has a notch bottom (shown as a BC part in fig. 16) and two notch side walls, which are respectively called a radial wall (shown as an AB side wall in fig. 15 and 16) and an inclined wall (shown as a CE side wall in fig. 15 and 16), wherein the radial wall extends in a radial direction of the interlocking wheel 6, and the extending direction of the inclined wall is oblique to the radial direction of the interlocking wheel 6; the inclined wall (e.g., CE side wall in fig. 15, 16) is divided into two sections, the first section of inclined wall (e.g., ED side wall section in fig. 15, 16) is near the edge of the interlocking wheel, and the second section of inclined wall (e.g., CD side wall section in fig. 15, 16) is near the bottom of the notch (e.g., BC section in fig. 15, 16);
as shown in fig. 7, 9, 11, 12, 14, 15 and 16, each notch (first notch 10\second notch 20) of the interlocking wheel 6 is correspondingly provided with a swinging piece 7, a swinging shaft 70 of the swinging piece 7 is installed at the edge area of the interlocking wheel 6, the swinging piece 7 comprises an arc-shaped splicing part 72 and a swinging main body 71, and the swinging end of the swinging main body 71 is fixedly connected with the arc-shaped splicing part 72 into a whole; the longitudinal (longitudinal direction is also the axial direction of the interlocking wheel 6) position of the arc splice 72 overlaps with the longitudinal position of the interlocking wheel 6, and the longitudinal position of the swing body 71 is staggered with the longitudinal position of the interlocking wheel 6; the arc splicing part 72 has an outer side surface (such as MH arc surface in fig. 15, 16 and 20) with an arc shape and two inner side surfaces (such as NG surface and HG surface in fig. 15, 16 and 20); a third torsion spring for applying torsion to the swinging member 7 is further arranged, and the torque direction of the third torsion spring is to push the arc-shaped splicing part 72 of the swinging member 7 to a direction close to the inclined wall of the notch of the interlocking wheel 6; when the swinging member 7 is in the normal position under the torsion of the third torsion spring, the outer side surface (such as MH cambered surface in fig. 15 and 16) of the arc-shaped splicing part 72 is spliced with the outer peripheral edge (such as EF edge in fig. 15 and 16) of the interlocking wheel to form a continuous smooth arc segment (such as MHEF arc segment in fig. 15), the first side inner side surface (such as HG surface in fig. 16) of the arc-shaped splicing part 72 presses on the first inclined wall (such as ED side wall segment in fig. 15 and 16) of the notch, and an acute angle is formed between the second side inner side surface (such as NG surface in fig. 15) of the arc-shaped splicing part 72 and the second inclined wall (such as CD side wall segment in fig. 15), and the acute angle is shown as NDC in fig. 15.
The use process and principle of the above embodiment are as follows:
1. when the main operation shaft 41 rotates clockwise to drive the moving contact 30 to move to the grounding position, the first notch 10 of the interlocking wheel 6 rotates to a position aligned with the first bayonet 11 of the first swinging block, the torsion force of the first torsion spring 13 enables the first bayonet 11 to be embedded into the first notch 10 of the interlocking wheel, as shown in fig. 17 and 18, the first pawl 15 is embedded into the tooth slot of the gear 5 to limit the gear to rotate clockwise continuously, as shown in fig. 23, so that the main operation shaft can be prevented from continuously pushing the moving contact 30 to strongly press and collide with the grounding contact 31; similarly, when the main operation shaft 41 rotates anticlockwise to drive the moving contact 30 to move to the closing position, the second notch 20 of the interlocking wheel 6 rotates to a position aligned with the second bayonet 21 of the second swinging block 2, the torsion force of the second torsion spring 23 makes the second bayonet 21 insert into the second notch 20 of the interlocking wheel, the second pawl 25 inserts into the tooth slot of the gear 5 to limit the gear 5 to rotate anticlockwise, as shown in fig. 24, so that the main operation shaft 41 can be prevented from continuously pushing the moving contact 30 to strongly press and collide with the isolation contact 33.
2. When the moving contact 30 is about to reach the grounding position, the first notch 10 of the interlocking wheel 6 is gradually aligned with the first bayonet 11, the first bayonet 11 slides along the outer side HM of the arc-shaped splicing part 72 for a certain radian (here, the first bayonet 11 is actually fixed, the interlocking wheel 6 and the arc-shaped splicing part 72 rotate), then the first bayonet 10 suddenly falls into the first notch instead of slowly falling into the notch along the inclined wall EC, so that the opening width of the first notch 10 is equivalent to the reduction of EA in fig. 15 into MA, the first bayonet 11 falls into the first notch 10 more accurately, that is, the first pawl 15 is embedded into the tooth slot of the gear 5 to limit the gear to continuously rotate clockwise. On the other hand, when the moving contact 30 just leaves the grounding position and the first bayonet 11 needs to leave the first notch 10 at the edge of the interlocking wheel, the first bayonet 11 can push up the arc-shaped splicing part 72 of the swinging member and slowly climb out along the inclined wall CE of the first notch 10, as shown in fig. 19 and 20. The process of the second bayonet 21 reaching the second notch 20 or leaving the second notch 20 is similar to the process of the first bayonet 11 reaching the first notch 10 or leaving the first notch 10.
Claims (2)
1. The three fixed contacts are sequentially a grounding contact, a middle fixed contact and an isolating contact, the three fixed contacts are arranged on the same straight line and are all in a cylindrical structure, and the moving contact is in a round bar shape and is driven by a screw rod mechanism to move linearly between cylinder cavities of the three fixed contacts so as to switch the state; the movable contact is provided with three working positions, namely a grounding position, a switching-off position and a switching-on position in sequence; the movement of the moving contact from the closing position to the opening position and the movement from the opening position to the grounding position are called as forward movement of the moving contact, and the movement of the moving contact from the grounding position to the opening position and the movement from the opening position to the closing position are called as reverse movement of the moving contact;
the positioning mechanism comprises a frame, wherein the frame is provided with an output shaft and a main operation shaft, and the main operation shaft and the output shaft are positioned on the same straight line and fixedly connected to synchronously rotate; the output shaft drives the screw rod mechanism through a speed change gear set; the clockwise rotation of the main operation shaft drives the movable contact to move forward;
the method is characterized in that: the main operation shaft is fixedly connected with a gear and an interlocking wheel, two notches are formed in the edge of the interlocking wheel, and the two notches are a first notch and a second notch respectively; the frame is also provided with a first interlocking shaft and a second interlocking shaft, the second interlocking shaft is loosely sleeved outside the first interlocking shaft, and the first interlocking shaft and the second interlocking shaft can rotate relatively; the first interlocking shaft and the second interlocking shaft are positioned above the main operation shaft; the front end of the first interlocking shaft is fixedly connected with a first pawl, and the front end of the second interlocking shaft is fixedly connected with a second pawl; the first pawl and the second pawl are positioned above the gear;
the rear end of the first interlocking shaft is fixedly connected with a first swinging block, the rear end of the second interlocking shaft is fixedly connected with a second swinging block, the first swinging block is fixedly connected with a first bayonet lock, the second swinging block is fixedly connected with a second bayonet lock, the first bayonet lock is positioned on the left side of the first interlocking shaft, and the second bayonet lock is positioned on the right side of the second interlocking shaft; the first torsion spring is used for applying anticlockwise torque to the first interlocking shaft, and the second torsion spring is used for applying clockwise torque to the second interlocking shaft;
the first swing block, the first bayonet lock and the first pawl swing synchronously around the central axis of the first interlocking shaft; when the main operation shaft drives the movable contact to move to the grounding position, the first notch of the interlocking wheel rotates to a position aligned with the first bayonet, the torsion of the first torsion spring enables the first bayonet to be embedded into the first notch of the interlocking wheel, and the first pawl is embedded into the tooth slot of the gear to limit the gear to rotate clockwise;
the second swing block, the second bayonet lock and the second pawl swing synchronously around the central axis of the second interlocking shaft; when the main operation shaft drives the moving contact to move to the closing position, the second notch of the interlocking wheel rotates to a position aligned with the second bayonet, the torsion force of the second torsion spring enables the second bayonet to be embedded into the second notch of the interlocking wheel, and the second pawl is embedded into the tooth slot of the gear to limit the gear to rotate anticlockwise.
2. The precise positioning mechanism of a direct-acting three-position switch of claim 1, wherein: the structures of the first notch and the second notch are symmetrical and identical; each notch of the interlocking wheel is provided with a notch bottom and two notch side walls, the two notch side walls are respectively called a radial wall and an inclined wall, the extending direction of the radial wall is the radial direction of the interlocking wheel, and the extending direction of the inclined wall and the radial direction of the interlocking wheel form an oblique intersection; the inclined wall is divided into two sections, the first section of inclined wall is close to the edge of the interlocking wheel, and the second section of inclined wall is close to the bottom of the notch;
each notch is correspondingly provided with a swinging piece, a swinging shaft of the swinging piece is arranged in the edge area of the interlocking wheel, and the swinging piece comprises an arc-shaped splicing part and a swinging main body which are fixedly connected into a whole; the longitudinal position of the arc-shaped splicing part is overlapped with the longitudinal position of the interlocking wheel, and the longitudinal position of the swinging main body is staggered with the longitudinal position of the interlocking wheel; the arc splicing part is provided with an outer side surface with an arc shape on one surface and two inner side surfaces; the swing piece is provided with a first torsion spring which is used for applying torsion to the swing piece, and the torsion direction of the first torsion spring is that the arc-shaped splicing part of the swing piece is pushed to the direction of the inclined wall close to the notch of the interlocking wheel; when the swinging piece is in a normal position under the torsion action of the third torsion spring, the outer side face of the arc-shaped splicing part is spliced with the outer peripheral edge of the interlocking wheel to form a continuous smooth arc shape, the inner side face of the first face of the arc-shaped splicing part is pressed on the first section inclined wall of the notch, and an acute angle is formed between the inner side face of the second face of the arc-shaped splicing part and the second section inclined wall of the notch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410146408.3A CN117672761B (en) | 2024-02-02 | 2024-02-02 | Accurate positioning mechanism of direct-acting type three-station switch |
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| CN202410146408.3A CN117672761B (en) | 2024-02-02 | 2024-02-02 | Accurate positioning mechanism of direct-acting type three-station switch |
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| CN117672761B CN117672761B (en) | 2024-04-09 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101395685A (en) * | 2006-03-03 | 2009-03-25 | 溯高美股份有限公司 | Automated control module for electrical cut-off apparatus and electrical cut-off apparatus equipped with such a control module |
| CN101656163A (en) * | 2008-08-22 | 2010-02-24 | 东莞安联电器元件有限公司 | Ratchet mechanism and rotary switch with same |
| WO2023217210A1 (en) * | 2022-05-11 | 2023-11-16 | 上海良信电器股份有限公司 | Operation mechanism capable of being operated at multiple sides, isolation switch and switch appliance |
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2024
- 2024-02-02 CN CN202410146408.3A patent/CN117672761B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101395685A (en) * | 2006-03-03 | 2009-03-25 | 溯高美股份有限公司 | Automated control module for electrical cut-off apparatus and electrical cut-off apparatus equipped with such a control module |
| CN101656163A (en) * | 2008-08-22 | 2010-02-24 | 东莞安联电器元件有限公司 | Ratchet mechanism and rotary switch with same |
| WO2023217210A1 (en) * | 2022-05-11 | 2023-11-16 | 上海良信电器股份有限公司 | Operation mechanism capable of being operated at multiple sides, isolation switch and switch appliance |
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| CN117672761B (en) | 2024-04-09 |
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