A crank arm of a spring operating mechanism and a spring operating mechanism

Abstract

The present invention relates to the field of operating mechanisms of protective switches, and in particular to a crank arm of a spring operating mechanism and a spring operating mechanism. The crank arm of the spring operating mechanism of the present invention includes a closing retaining latch, and a connecting plate for installing the closing retaining latch is provided at one end of the crank arm. The closing retaining latch is rotatably connected to the connecting plate, and a mounting hole is provided on the crank arm. The mounting hole is provided with an opening at one end facing the closing retaining latch, and a push rod for cooperating with the closing retaining latch is provided in the mounting hole. A closing retaining latch reset spring is installed between the push rod and the crank arm, and the closing retaining latch includes a matching section for cooperating with a push column on the closing buckle plate. The crank arm of the spring operating mechanism of the present invention has a compact structure, and the reset spring of the closing retaining latch on the crank arm is not affected by external factors, thereby extending the service life of the reset spring.

Description

Technical Field

[0001] The invention relates to the field of operating mechanisms of protection switches, and in particular to a crank arm of a spring operating mechanism and a spring operating mechanism. Background Art

[0002] In order to enable the spring operating mechanism of the circuit breaker to stably and reliably drive the circuit breaker to complete the closing operation, a closing holding system needs to be set on the spring operating mechanism. The closing holding system of the existing spring operating mechanism of the circuit breaker is usually a two-level holding system, including a main crank arm, a closing holding latch, an opening holding latch and an opening trip plate. To ensure reliable closing, the torsional force of the reset spring of the opening trip plate must be large enough. Therefore, when opening is required, the torsional force of the reset spring of the opening trip plate needs to be overcome, which makes opening very difficult.

[0003] A Chinese utility model patent with the authorization announcement number CN202434406U and the authorization announcement date September 12, 2012 discloses a closing holding device, which includes a crank arm, a closing holding latch and an opening latch. The closing holding latch is installed on the crank arm through a pin shaft, and a reset spring of the closing holding latch is installed on the crank arm. A closing buckle plate is provided between the crank arm and the opening latch. A closing half-shaft is provided on the side of the opening latch away from the closing buckle plate, a torsion spring is connected to the outer sleeve of the opening half-shaft, and a closing release plate is fixedly connected to the side thereof, and a closing release plate is provided on the opening release plate facing away from the opening latch. A tripping coil is provided on one side of the switch, and a first roller and a second roller are provided on the closing plate to cooperate with the closing holding latch and the opening holding latch respectively. When the switch is closed, the crank arm drives the closing holding latch to rotate, and the closing holding latch is supported by the first roller. At the same time, one end of the opening latch is supported on the second roller, and the other end is supported on the opening half shaft, and the mechanism keeps the switch closed; when the mechanism is opened, the opening coil acts to push the opening trip plate to offset the torsion of the torsion spring, and the notch position of the opening half shaft rotates through the contact surface between the opening latch and the opening half shaft. At this time, the closing constraint is released, and the crank arm rotates clockwise to complete the opening. The closing holding device uses spring energy storage, the opening force is small, and it can achieve rapid opening, but the reset spring of the closing holding latch of the closing holding device is installed on the outside of the crank arm, and the structure is not compact. At the same time, there is also the problem that the reset spring is easily affected by external factors, which affects the service life. Summary of the invention

[0004] The object of the present invention is to provide a crank arm of a spring operating mechanism to solve the problems that the crank arm structure of the existing closing holding device is not compact and the reset spring of the closing holding latch is easily affected by external factors, thereby affecting the service life; the object of the present invention is also to provide a spring operating mechanism using the crank arm.

[0005] To achieve the above object, the crank arm of the spring operating mechanism of the present invention adopts the following technical solution: The crank arm of the spring operating mechanism includes a closing retaining latch, a connecting plate for installing the closing retaining latch is provided at one end of the crank arm, the closing retaining latch is rotatably connected to the connecting plate, a mounting hole is opened on the crank arm, the mounting hole is provided with an opening at one end facing the closing retaining latch, a push rod for cooperating with the closing retaining latch is provided in the mounting hole, a closing retaining latch reset spring is top-installed between the push rod and the crank arm, and the closing retaining latch includes a mating section for cooperating with the push column on the closing buckle plate.

[0006] Furthermore, a stopper is provided at one end of the mounting hole away from the closing retaining latch, and a reset spring of the closing retaining latch is mounted between the stopper and the push rod.

[0007] Furthermore, the closing holding latch is connected to the connecting plate via a pin shaft.

[0008] Furthermore, the closing retaining latch is provided with an inclined surface cooperating with the push rod.

[0009] Furthermore, the connecting plate and the crank arm are an integrated structure.

[0010] Beneficial effects: The crank arm of the spring operating mechanism of the present invention is an improved invention. A mounting hole is provided on the crank arm of the spring operating mechanism of the present invention, and a closing and holding latch reset spring is arranged in the mounting hole, so that the closing and holding latch reset spring will not be affected by external factors, and the service life of the closing and holding latch reset spring can be extended. At the same time, a push rod is arranged in the mounting hole, and the push rod can drive the closing and holding latch to move under the action of the closing and holding latch reset spring. The push rod is arranged inside the crank arm to make the overall structure of the crank arm more compact.

[0011] The spring operating mechanism of the present invention adopts the following technical solutions: A spring operating mechanism comprises a closing holding device, the closing holding device comprises a crank arm, the crank arm comprises a closing holding latch, a connecting plate for mounting the closing holding latch is provided at one end of the crank arm, the closing holding latch is rotatably connected to the connecting plate, a mounting hole is provided on the crank arm, the mounting hole is provided with an opening at one end facing the closing holding latch, a push rod for cooperating with the closing holding latch is provided in the mounting hole, a closing holding latch reset spring is top-mounted between the push rod and the crank arm, and the closing holding latch comprises a cooperating section for cooperating with a push column on a closing buckle plate.

[0012] Furthermore, a stopper is provided at one end of the mounting hole away from the closing retaining latch, and a reset spring of the closing retaining latch is mounted between the stopper and the push rod.

[0013] Furthermore, the closing holding latch is connected to the connecting plate via a pin shaft.

[0014] Furthermore, the closing retaining latch is provided with an inclined surface cooperating with the push rod.

[0015] Furthermore, the connecting plate and the crank arm are an integrated structure.

[0016] Beneficial effects: The spring operating mechanism of the present invention is an improved invention. The spring operating mechanism of the present invention comprises a crank arm, a mounting hole is formed on the crank arm, a closing and holding latch reset spring is arranged in the mounting hole, so that the closing and holding latch reset spring will not be affected by external factors, and the service life of the closing and holding latch reset spring can be extended. At the same time, a push rod is arranged in the mounting hole, and the push rod can drive the closing and holding latch to move under the action of the closing and holding latch reset spring. The push rod is arranged inside the crank arm to make the overall structure of the crank arm more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a closing holding system of a spring operating mechanism of the present invention; Figure 2 The closing holding system of the spring operating mechanism of the present invention Figure 1 A schematic diagram of the closing position of the embodiment; Figure 3 The closing holding system of the spring operating mechanism of the present invention Figure 1 Schematic diagram of the opening position of the embodiment.

[0018] In the figure: 1. Main crank arm; 2. Opening holding latch; 3. Closing holding latch; 4. Push rod; 5. Closing holding latch reset spring; 6. Closing buckle plate; 7. Push column; 8. Roller; 9. Opening latch; 10. Torsion spring; 11. Gear lever. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The crank arm of the spring operating mechanism of the present invention arranges the reset spring of the closing holding latch inside the crank arm, so that the reset spring is not affected by external factors and its service life is extended. At the same time, the closing holding latch is driven by a push rod, and the push rod is also arranged inside the crank arm, so that the overall structure of the crank arm is more compact.

[0021] In a basic embodiment, Figure 1As shown, a connecting plate is provided on the left side of the main crank arm 1, and a closing holding latch 3 is rotatably connected to the connecting plate. A mounting hole obliquely facing the lower left is opened on the main crank arm 1, and a push rod 4 is installed in the mounting hole. A closing holding latch reset spring 5 is top-mounted between the mounting hole and the push rod 4. During the movement, the push rod 4 is always in contact with the closing holding latch 3. A closing buckle plate 6 is provided between the closing holding latch 3 and the opening holding latch 2. A push column 7 and a roller 8 are provided on the closing buckle plate 6. The closing holding latch 3 has a matching section that matches with the push column 7 on the closing buckle plate 6. The push column 7 matches with the closing holding latch 3, and the roller 8 matches with the opening holding latch 2. A closing latch latch 9 is provided on the left side of the opening holding latch 2, and one end of the closing latch latch 9 is pressed on the opening holding latch 2, as shown in FIG. Figure 2 As shown, when the spring operating mechanism is closed, the main crank arm 1 rotates clockwise for a certain angle, and the closing holding latch 3 is lifted up under the action of the push rod 4. When the main crank arm 1 rotates clockwise and falls back, the closing holding latch 3 presses down the push column 7 on the closing buckle plate 6, providing a counterclockwise rotation torque for the closing buckle plate 6, causing the closing buckle plate 6 to rotate counterclockwise until it contacts the right end of the opening holding latch 2, achieving torque balance, thereby achieving the closing holding state.

[0022] The push column 7 is arranged at the middle of the closing plate 6, near the closing holding latch 3, the roller 8 is arranged at the upper part of the closing plate 6, and a rotating shaft is arranged below the closing plate 6. The closing plate 6 can rotate around the rotating shaft, which can facilitate the realization of torque balance when the system is closed and realize reliable closing and holding. A torsion spring 10 is arranged on the rotating shaft of the closing plate 6, and the closing plate 6 can be reset after the operating mechanism completes the opening under the action of the torsion spring 10; in other embodiments, a tension spring can be arranged on the closing plate 6, one end of which is connected to the closing plate, and the tension of the tension spring provides the closing plate 6 with the reset force required for resetting, so that the closing plate 6 can be reset after the opening operation is completed. A shift lever 11 is provided below the side of the opening holding latch 2 close to the closing plate 6, and the shift lever 11 can limit the rotation angle of the opening holding latch 2 to prevent the opening holding latch 2 from rotating too much and affecting the closing holding ability of the spring operating mechanism, thereby ensuring that the position of the opening holding latch 2 remains unchanged when the closing holding is achieved, thereby ensuring the stable closing holding ability of the system; in other embodiments, a limit block can be provided below the side of the opening holding latch 2 close to the closing plate 6, and the limit block can be used to limit the rotation angle of the opening holding latch 2 to ensure the stable closing holding ability of the system.

[0023] In a preferred embodiment, a stopper is provided at one end of the mounting hole of the main crank arm 1 away from the closing retaining latch 3, and the closing retaining latch reset spring 5 is mounted between the top rod 4 and the stopper in the mounting hole, so that the top rod 4 can move in the mounting hole under the action of the closing retaining latch reset spring 5, thereby driving the closing retaining latch 3 to rotate; in other embodiments, a stopper may also be provided on the top rod 4, and the closing retaining latch reset spring 5 is sleeved on the outside of the top rod 4, and the closing retaining latch reset spring 5 is respectively engaged with the stopper of the top rod 4 and the stopper on the mounting hole. In other embodiments, a retaining ring may be fixedly installed in the mounting hole, and the closing retaining latch reset spring 5 may be installed between the retaining ring and the push rod 4, so that the push rod 4 may push the closing retaining latch 3 under the action of the closing retaining latch reset spring 5 to rotate the closing retaining latch 3; in other embodiments, the mounting hole may also be a through hole, and a stop portion may be provided in the mounting hole, and the closing retaining latch reset spring 5 may be installed between the stop portion of the mounting hole and the push rod 4.

[0024] In a preferred embodiment, the closing retaining latch 3 is rotatably connected to the connecting plate via a pin shaft, so that the closing retaining latch 3 can rotate relative to the main crank arm 1, ensuring that the closing retaining latch 3 can support the push column 7 on the closing buckle plate 6 when closing the switch, so that the closing retaining system as a whole can achieve torque balance; in other embodiments, a connecting column can be provided on the connecting plate, and a rotating bearing can be sleeved on the connecting column, and the closing retaining latch 3 is sleeved on the rotating bearing, which can reduce the friction of the closing retaining latch 3 during rotation.

[0025] In a preferred embodiment, a slope cooperating with the push rod 4 is provided on the side of the closing holding latch 3 close to the main crank arm 1, so that the closing holding latch 3 can stably rotate under the action of the push rod 4 and the closing holding latch reset spring 5, and at the same time, the friction between the push rod 4 and the closing holding latch 3 can be reduced, the service life can be extended, and the spring operating mechanism can be ensured to achieve stable closing retention; in other embodiments, a circular arc surface cooperating with the push rod 4 can be provided on the closing holding latch 3 to further reduce the friction between the closing holding latch and the push rod 4 and extend the service life of the closing holding latch 3 and the push rod 4.

[0026] In a preferred embodiment, the connecting plate and the main crank arm 1 are an integrated structure, so that when the closing holding latch 3 is installed on the connecting plate, the structure of the main crank arm 1 is more stable, and the closing holding ability of the spring operating mechanism will not be affected by deformation of the connecting plate; in other embodiments, the connecting plate can be welded to the main crank arm 1, which can improve the overall strength of the main crank arm 1 and prevent the connecting plate from falling off, thereby affecting the closing holding performance of the spring operating mechanism.

[0027] The main crank arm 1 of the spring operating mechanism of the present invention cooperates with the closing holding system of the spring operating mechanism, such as Figure 1 As shown, before the mechanism is closed, the opening latch 9 and the opening holding catch 2 are both kept in their own stable state under the action of their respective reset springs, and the closing catch plate 6 is kept in contact with the closing holding catch 3 under the action of its own reset spring; Figure 2 As shown, with the closing operation of the spring operating mechanism, the main crank arm 1 rotates clockwise. When the main crank arm 1 rotates to a certain angle, the closing holding latch 3 is separated from the closing buckle plate 6. The closing holding latch 3 rotates clockwise under the action of the push rod 4 and the closing holding latch reset spring 5. When the main crank arm 1 falls back, the closing holding latch 3 presses down the closing buckle plate 6, presses against the push column 7 on the closing buckle plate 6 and gives the closing buckle plate 6 a counterclockwise rotation force. The closing buckle plate 6 rotates counterclockwise under the action of the closing holding latch 3, so that the roller 8 contacts and presses the right end of the opening holding latch 2, realizing torque balance and reaching the closing holding state; as shown in FIG. Figure 3 As shown, when the spring operating mechanism receives the opening command, the opening electromagnet pushes the opening latch 9 to rotate clockwise, and the opening latch 9 presses down the opening holding latch 2 to make the opening holding latch 2 rotate counterclockwise, so that the opening holding latch 2 is separated from the closing buckle plate 6, and the closing buckle plate 6 continues to rotate counterclockwise under the action of the counterclockwise torque provided by the closing holding latch 3, thereby releasing the closing holding latch 3, allowing the main crank arm 1 to complete the counterclockwise rotation and complete the opening operation.

[0028] The specific implementation of the spring operating mechanism of the present invention is: The main crank arm is installed in the spring operating mechanism and used together with the closing holding system of the spring operating mechanism. The specific implementation of the main crank arm 1 cooperating with the closing holding system is as described above and will not be repeated here.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A spring operating mechanism crank arm, including a closing holding latch, characterized in that: A connecting plate for mounting a closing retaining latch is provided at one end of the crank arm, and the closing retaining latch is rotatably connected to the connecting plate. A mounting hole is provided on the crank arm, and an opening is provided at one end of the mounting hole facing the closing retaining latch. A push rod for cooperating with the closing retaining latch is provided in the mounting hole, and a closing retaining latch reset spring is installed between the push rod and the crank arm. The closing retaining latch includes a cooperating section for cooperating with a push column on the closing buckle plate.

2. The crank arm of the spring operating mechanism according to claim 1, characterized in that: A stopper is provided at one end of the mounting hole away from the closing retaining latch, and a reset spring of the closing retaining latch is mounted between the stopper and the push rod.

3. The crank arm of the spring operating mechanism according to claim 1 or 2, characterized in that: The closing holding latch is connected to the connecting plate through a pin shaft.

4. The crank arm of the spring operating mechanism according to claim 1 or 2, characterized in that: The closing and holding latch is provided with an inclined surface which cooperates with the ejector rod.

5. The crank arm of the spring operating mechanism according to claim 1 or 2, characterized in that: The connecting plate and the crank arm are an integrated structure.

6. A spring operating mechanism, comprising a closing holding device, the closing holding device comprising a crank arm, the crank arm comprising a closing holding latch, characterized in that: A connecting plate for mounting a closing retaining latch is provided at one end of the crank arm, and the closing retaining latch is rotatably connected to the connecting plate. A mounting hole is provided on the crank arm, and an opening is provided at one end of the mounting hole facing the closing retaining latch. A push rod for cooperating with the closing retaining latch is provided in the mounting hole, and a closing retaining latch reset spring is installed between the push rod and the crank arm. The closing retaining latch includes a cooperating section for cooperating with a push column on the closing buckle plate.

7. The spring operating mechanism according to claim 6, characterized in that: A stopper is provided at one end of the mounting hole away from the closing retaining latch, and a reset spring of the closing retaining latch is mounted between the stopper and the push rod.

8. The spring operating mechanism according to claim 6 or 7, characterized in that: The closing holding latch is connected to the connecting plate through a pin shaft.

9. The spring operating mechanism according to claim 6 or 7, characterized in that: The closing and holding latch is provided with an inclined surface which cooperates with the ejector rod.

10. The spring operating mechanism according to claim 6 or 7, characterized in that: The connecting plate and the crank arm are an integrated structure.

Images