Three-station mechanism self-resetting locking device and three-station mechanism

Abstract

The application provides a three-position mechanism self-reset locking device and a three-position mechanism, and belongs to the technical field of switch operating mechanisms. The self-reset locking device comprises a locking disc, a locking rod, a lever, a first reset elastic member and a clamping support structure. The locking disc is provided with a closing locking groove, an opening locking groove and a grounding locking groove. One end of the clamping support structure is hingedly connected to the lever. The locking disc is further provided with a closing support structure, an opening support structure and a grounding support structure. When the lever is moved to unlock the locking rod, the corresponding support structure can support the clamping support structure, and the counterforce of the first reset elastic member can keep the clamping support structure in a balanced state, so that the locking rod is kept in an unlocked state. Therefore, the operator does not need to apply force to the lever, the labor intensity is reduced, and the input shaft can be conveniently operated through the operating handle subsequently.

Description

Technical Field

[0001] This invention relates to a self-resetting locking device for a three-position mechanism and a three-position mechanism, belonging to the technical field of switch operation mechanisms. Background Technology

[0002] Currently, most gas-insulated switchgear uses a bus-side direct-acting three-position switch. This three-position switch must reliably lock in the open, closed, and grounded positions. The three-position switch itself does not have a locking function; it requires a locking device within the three-position mechanism. When manually controlling the three-position mechanism to operate the switch for opening or closing, the locking device must first be unlocked. Then, the mechanism is operated. When the switch is closed, opened, or grounded, the locking device resets, locking the three-position switch.

[0003] Existing three-position mechanisms typically include a frame, a closing / opening limit shaft mounted on the frame, and a locking disc fixed on the closing / opening limit shaft. The locking disc is provided with locking grooves corresponding to the closing position, the opening position, and the grounding position, respectively. The three-position mechanism also includes a locking rod for extending into the corresponding locking groove in the closing position, the opening position, or the grounding position. A return spring is provided between the locking rod and the frame.

[0004] Because the end of the locking rod extends into the corresponding locking groove, the three-position mechanism needs to be unlocked each time it performs closing, opening, or grounding. The existing unlocking method involves connecting a lever to the locking rod. This lever moves the locking rod and simultaneously compresses the return spring, causing the end of the locking rod to disengage from the locking groove, releasing the locking disc. Then, the input shaft can be rotated via a handle to switch between closing, opening, and grounding. The locking disc and input shaft are connected by a gear pair. Therefore, when the input shaft rotates to the closing, opening, or grounding position, the locking groove on the locking disc also rotates to a specific position, causing the locking rod to re-enter the corresponding locking groove under the action of the return spring, thus locking the closing, opening, or grounding state.

[0005] Therefore, the existing unlocking method requires first moving the lever. For a manually controlled three-position mechanism, the operator needs to continuously apply force to the lever until the input shaft is rotated by the handle, that is, until the locking disc is rotated. Only then can the operator release the lever, and the locking rod can be temporarily pressed against the outer circumference of the locking disc under the action of the return spring until the next locking groove moves to the position corresponding to the locking rod. Under the action of the return spring, the end of the locking rod will automatically extend into the locking groove to lock the closed, open or grounded state at this time.

[0006] Since moving the lever requires overcoming the spring force of the return spring, maintaining a constant force means constantly overcoming the spring force, which increases the operator's workload and makes operation very strenuous. To reduce this strenuous effort, the operator must quickly pick up the handle and engage it with the input shaft, then quickly rotate the input shaft to release the lever. The entire operation is very inconvenient and cannot be performed with ease; problems can easily occur in a panic. Summary of the Invention

[0007] The purpose of this invention is to provide a self-resetting locking device for a three-station mechanism to solve the problem in the prior art where the operator must constantly overcome the spring force of the reset spring to maintain force on the lever when unlocking the locking lever, resulting in high labor intensity and inconvenience in operation; the purpose of this invention is also to provide a three-station mechanism to solve the above problems.

[0008] To achieve the above objectives, the self-resetting locking device of the three-station mechanism in this invention adopts the following technical solution: A self-resetting locking device for a three-position mechanism includes: a locking disc for mounting on the opening and closing limit shaft of the three-position mechanism; a locking rod for mounting on the frame of the three-position mechanism; the locking disc is provided with grooves corresponding to the closing position, the opening position and the grounding position respectively, and for the locking rod to be movably inserted; a lever is connected to the locking rod for driving the locking rod to move away from the groove; a first reset elastic element is provided between the locking rod and the frame. The three-position mechanism self-resetting locking device also includes a locking structure. One end of the locking structure is hinged to the lever. The locking disc is also provided with support structures corresponding to the closing position, opening position and grounding position respectively. The other end of the locking structure is movably connected to the support structure. The other end of the locking structure is used to engage with the support structure when the locking rod is separated from the groove. The first reset elastic element is used to drive the lever to move towards the groove when the other end of the locking structure is separated from the support structure, so that the locking rod is inserted into the groove.

[0009] The beneficial effects of the above technical solution are as follows: This invention provides an improved three-position mechanism self-resetting locking device, which includes a locking structure. One end of the locking structure is hinged to a lever. When the lever moves, the locking structure can move accordingly and can rotate relative to the lever. The other end of the locking structure is movably connected to a support structure on the locking disc. When the lever causes the locking rod to separate from the groove, the locking structure engages with the support structure, keeping the locking rod in the unlocked state. During this process, the first reset elastic element is deformed by force. Therefore, when the other end of the locking structure separates from the support structure, the first reset elastic element can drive the lever to move towards the groove, so that the locking rod is inserted into the groove and locked again.

[0010] With the above solution, operators no longer need to apply force to the lever. That is, when moving the lever, it is only necessary to overcome the elastic force of the first reset elastic element in a short time. As long as the locking structure moves with the lever until it can be supported on the corresponding support structure, the lever can be released. There is no need to constantly overcome the elastic force of the first reset elastic element, which reduces the labor intensity of the operator. Furthermore, since the locking lever is already in the unlocked state, the operator can calmly and easily pick up the handle and cooperate with the input shaft to switch between closing, opening, or grounding by rotating the input shaft. The operation is very convenient.

[0011] It should be noted that the rotation of the input shaft means the rotation of the locking disc. The torque on the input shaft is transmitted to the locking disc. As long as the support structure disengages the retaining structure, the locking disc can rotate smoothly. At this time, the balance of the retaining structure is broken. The locking rod is pressed against the outer circumference of the locking disc under the reaction force of the first reset elastic element until the next locking groove rotates to the corresponding position. The locking rod is then inserted into the locking groove again. The subsequent process is the same as that in the prior art.

[0012] Furthermore, the support structure includes a closing support groove, a opening support groove, and a grounding support groove.

[0013] The advantages of the above technical solution are: the groove structure is relatively simple, easy to process and manufacture, and can also provide relatively stable support for the clamping structure.

[0014] Furthermore, the locking disc is provided with an annular groove coaxial with its own rotation axis. The annular groove has an inner circumferential groove sidewall. The closing support groove, the opening support groove, and the grounding support groove are all provided on the inner circumferential groove sidewall of the annular groove. The locking structure includes a support rod and a locking pin. One end of the support rod is hinged to one end of the lever, and the locking pin is installed on the other end of the support rod. The locking pin is used to extend into the annular groove and engage with any one of the closing support groove, the opening support groove, and the grounding support groove.

[0015] The beneficial effects of the above technical solution are as follows: setting the support grooves on the inner circumferential groove sidewall of the annular groove can reduce the axial dimension of the locking disc and make the structure more compact; the clamping structure includes a support rod and a clamping pin, which facilitates the manufacturing of the clamping structure, and the clamping pin can extend into the annular groove, thereby facilitating the support and cooperation with the corresponding support groove. Of course, the clamping pin can also be easily removed from the support groove, which facilitates the smooth rotation of the input shaft and the locking disc and avoids jamming.

[0016] Furthermore, the closing support groove, the opening support groove, and the grounding support groove are all inferior arc-shaped grooves.

[0017] The beneficial effect of the above technical solution is that the inferior arc-shaped groove can not only provide stable support, but also facilitate the disengagement of the locking pin.

[0018] Furthermore, the locking pin is hinged to the support rod.

[0019] The beneficial effects of the above technical solution are as follows: the locking pin can rotate relative to the support rod. When the locking pin is in the annular groove and is not engaged with any support groove, it facilitates the rotation of the locking pin and reduces wear between the inner and outer circumferential groove sidewalls of the locking disc.

[0020] Furthermore, the lever passes through the locking rod and is fixedly connected to the locking rod. The first reset elastic element is a reset spring sleeved on the locking rod, with one end of the reset spring abutting against the lever and the other end abutting against the frame.

[0021] The beneficial effects of the above technical solution are as follows: the first reset elastic element is a reset spring, and the reset spring is sleeved on the locking rod, with one end abutting against the lever, which facilitates the configuration and installation of the first reset elastic element.

[0022] Furthermore, the three-station mechanism self-resetting locking device also includes a support shaft for fixing on the frame and a rotating plate rotatably mounted on the support shaft. The rotating plate is provided with a slot, and the lever engages with the slot to push the rotating plate to rotate when the lever moves. The three-station mechanism self-resetting locking device also includes a baffle rotatably mounted on the support shaft or the rotating plate and rotating synchronously with the rotating plate. The baffle is used to block the input shaft of the three-station mechanism when the locking lever is inserted into the corresponding locking groove, so that the input shaft cannot be connected to the operating handle. The baffle is also used to allow the input shaft to move away with the rotation of the rotating plate when the lever drives the locking lever to unlock, so that the input shaft can be connected to the operating handle. A second reset elastic element is connected between the baffle and the rotating plate.

[0023] The beneficial effects of the above technical solution are as follows: the lever engages with the slot, and when the lever moves, it can push the rotating plate to rotate; the self-resetting locking device of the three-position mechanism also includes a baffle, which is rotatably mounted on the support shaft or the rotating plate and can rotate synchronously with the rotating plate; when the locking rod is inserted into the corresponding locking groove, it indicates that the three-position switch is in the open, closed, or grounded position. At this time, the baffle blocks the input shaft of the three-position mechanism, preventing the input shaft from connecting to the operating handle and preventing the switching of positions, thereby preventing damage to the three-position mechanism due to misoperation; when the lever drives the locking rod to unlock, the locking rod pushes the rotating plate to rotate through the slot, and then the baffle moves with the rotation of the rotating plate to allow the input shaft to connect to the operating handle, thereby enabling the switching of positions, ensuring both operational safety and the normal function of the three-position mechanism. In addition, a second reset elastic element is connected between the baffle and the rotating plate. This is because once the input shaft rotates, which means that the locking disc rotates, the locking rod will automatically insert into the corresponding locking groove under the reaction force of the first reset elastic element when the next locking groove of the locking disc rotates to the corresponding position, thus returning to the locked state. During this process, the lever resets and drives the rotating plate to rotate, while the handle remains connected to the input shaft. Therefore, the baffle cannot reset with the rotating plate, but instead presses against the handle, causing the second reset elastic element to deform under force. In this way, once the handle is removed, the baffle can reset under the reaction force of the second reset elastic element, so that it can continue to rotate with the rotating plate to allow the input shaft to pass next time.

[0024] Furthermore, the baffle and the rotating plate are rotatably mounted on the support shaft. A limiting plate is connected to the side of the baffle on the rotating plate. The limiting plate is used to abut against the baffle so that when the lever drives the locking lever to unlock and the rotating plate rotates, the limiting plate pushes the baffle to rotate synchronously.

[0025] The advantages of the above technical solution are as follows: the baffle is also rotatably mounted on the support shaft, and the installation method is simple; a limit plate is connected to the side of the baffle on the rotating plate. When the lever drives the locking lever to unlock and the rotating plate rotates, the limit plate can push the baffle to rotate synchronously, thereby opening the input shaft, which is convenient and simple, and facilitates the processing and manufacturing of the rotating plate.

[0026] Furthermore, the end of the limiting plate is vertically connected to an extension plate extending in a direction away from the support shaft, and the second reset elastic element is a tension spring, with its two ends connected to the extension plate and the baffle respectively.

[0027] The beneficial effects of the above technical solution are as follows: the second reset elastic element is a tension spring, which is convenient to configure. At the same time, the end of the limiting plate is vertically connected to an extension plate, and the two ends of the tension spring are respectively connected to the extension plate and the baffle, which facilitates the installation of the tension spring.

[0028] To achieve the above objectives, the three-station mechanism of this invention adopts the following technical solution: A three-position mechanism includes: a frame, an input shaft mounted on the frame, a closing / opening limit shaft, and a self-resetting locking device. The self-resetting locking device includes a locking disc mounted on the closing / opening limit shaft and a locking rod mounted on the frame. The locking disc is provided with grooves corresponding to the closing position, the opening position, and the grounding position, respectively, and for the locking rod to be movably inserted. A lever is connected to the locking rod for moving the locking rod away from the groove. A first reset elastic element is provided between the locking rod and the frame. The three-position mechanism self-resetting locking device also includes a locking structure. One end of the locking structure is hinged to the lever. The locking disc is also provided with support structures corresponding to the closing position, opening position and grounding position respectively. The other end of the locking structure is movably connected to the support structure. The other end of the locking structure is used to engage with the support structure when the locking rod is separated from the groove. The first reset elastic element is used to drive the lever to move towards the groove when the other end of the locking structure is separated from the support structure, so that the locking rod is inserted into the groove.

[0029] The beneficial effects of the above technical solution are as follows: This invention provides an improved three-station mechanism, whose self-resetting locking device includes a locking structure. One end of the locking structure is hinged to a lever. When the lever moves, the locking structure can move accordingly and can rotate relative to the lever. The other end of the locking structure is movably connected to a support structure on the locking disc. When the lever causes the locking rod to separate from the groove, the locking structure engages with the support structure, keeping the locking rod in the unlocked state. During this process, the first reset elastic element is deformed by force. Therefore, when the other end of the locking structure separates from the support structure, the first reset elastic element can drive the lever to move towards the groove, so that the locking rod is inserted into the groove and locked again.

[0030] With the above solution, operators no longer need to apply force to the lever. That is, when moving the lever, it is only necessary to overcome the elastic force of the first reset elastic element in a short time. As long as the locking structure moves with the lever until it can be supported on the corresponding support structure, the lever can be released. There is no need to constantly overcome the elastic force of the first reset elastic element, which reduces the labor intensity of the operator. Furthermore, since the locking lever is already in the unlocked state, the operator can calmly and easily pick up the handle and cooperate with the input shaft to switch between closing, opening, or grounding by rotating the input shaft. The operation is very convenient.

[0031] It should be noted that the rotation of the input shaft means the rotation of the locking disc. The torque on the input shaft is transmitted to the locking disc. As long as the support structure disengages the retaining structure, the locking disc can rotate smoothly. At this time, the balance of the retaining structure is broken. The locking rod is pressed against the outer circumference of the locking disc under the reaction force of the first reset elastic element until the next locking groove rotates to the corresponding position. The locking rod is then inserted into the locking groove again. The subsequent process is the same as that in the prior art.

[0032] Furthermore, the support structure includes a closing support groove, a opening support groove, and a grounding support groove.

[0033] The advantages of the above technical solution are: the groove structure is relatively simple, easy to process and manufacture, and can also provide relatively stable support for the clamping structure.

[0034] Furthermore, the locking disc is provided with an annular groove coaxial with its own rotation axis. The annular groove has an inner circumferential groove sidewall. The closing support groove, the opening support groove, and the grounding support groove are all provided on the inner circumferential groove sidewall of the annular groove. The locking structure includes a support rod and a locking pin. One end of the support rod is hinged to one end of the lever, and the locking pin is installed on the other end of the support rod. The locking pin is used to extend into the annular groove and engage with any one of the closing support groove, the opening support groove, and the grounding support groove.

[0035] The beneficial effects of the above technical solution are as follows: setting the support grooves on the inner circumferential groove sidewall of the annular groove can reduce the axial dimension of the locking disc and make the structure more compact; the clamping structure includes a support rod and a clamping pin, which facilitates the manufacturing of the clamping structure, and the clamping pin can extend into the annular groove, thereby facilitating the support and cooperation with the corresponding support groove. Of course, the clamping pin can also be easily removed from the support groove, which facilitates the smooth rotation of the input shaft and the locking disc and avoids jamming.

[0036] Furthermore, the closing support groove, the opening support groove, and the grounding support groove are all inferior arc-shaped grooves.

[0037] The beneficial effect of the above technical solution is that the inferior arc-shaped groove can not only provide stable support, but also facilitate the disengagement of the locking pin.

[0038] Furthermore, the locking pin is hinged to the support rod.

[0039] The beneficial effects of the above technical solution are as follows: the locking pin can rotate relative to the support rod. When the locking pin is in the annular groove and is not engaged with any support groove, it facilitates the rotation of the locking pin and reduces wear between the inner and outer circumferential groove sidewalls of the locking disc.

[0040] Furthermore, the lever passes through the locking rod and is fixedly connected to the locking rod. The first reset elastic element is a reset spring sleeved on the locking rod, with one end of the reset spring abutting against the lever and the other end abutting against the frame.

[0041] The beneficial effects of the above technical solution are as follows: the first reset elastic element is a reset spring, and the reset spring is sleeved on the locking rod, with one end abutting against the lever, which facilitates the configuration and installation of the first reset elastic element.

[0042] Furthermore, the self-resetting locking device also includes a support shaft fixed on the frame and a rotating plate rotatably mounted on the support shaft. The rotating plate is provided with a slot, and the lever engages with the slot to push the rotating plate to rotate when the lever moves. The self-resetting locking device also includes a baffle rotatably mounted on the support shaft or the rotating plate and rotating synchronously with the rotating plate. The baffle is used to block the input shaft of the three-position mechanism when the locking lever is inserted into the corresponding locking groove, so that the input shaft cannot be connected to the operating handle. The baffle is also used to allow the input shaft to move aside as the rotating plate rotates when the lever drives the locking lever to unlock, so that the input shaft can be connected to the operating handle. A second reset elastic element is connected between the baffle and the rotating plate.

[0043] The beneficial effects of the above technical solution are as follows: the lever engages with the slot, and when the lever moves, it can push the rotating plate to rotate; the self-resetting locking device also includes a baffle, which is rotatably mounted on the support shaft or the rotating plate and can rotate synchronously with the rotating plate; when the locking rod is inserted into the corresponding locking groove, it indicates that the three-position switch is in the open, closed, or grounded position. At this time, the baffle blocks the input shaft of the three-position mechanism, preventing the input shaft from connecting to the operating handle and preventing position switching, thereby preventing damage to the three-position mechanism due to misoperation; when the lever drives the locking rod to unlock, the locking rod pushes the rotating plate to rotate through the slot, and the baffle moves with the rotation of the rotating plate to allow the input shaft to connect to the operating handle, thereby enabling position switching, ensuring both operational safety and the normal function of the three-position mechanism. In addition, a second reset elastic element is connected between the baffle and the rotating plate. This is because once the input shaft rotates, which means that the locking disc rotates, the locking rod will automatically insert into the corresponding locking groove under the reaction force of the first reset elastic element when the next locking groove of the locking disc rotates to the corresponding position, thus returning to the locked state. During this process, the lever resets and drives the rotating plate to rotate, while the handle remains connected to the input shaft. Therefore, the baffle cannot reset with the rotating plate, but instead presses against the handle, causing the second reset elastic element to deform under force. In this way, once the handle is removed, the baffle can reset under the reaction force of the second reset elastic element, so that it can continue to rotate with the rotating plate to allow the input shaft to pass next time.

[0044] Furthermore, the baffle and the rotating plate are rotatably mounted on the support shaft. A limiting plate is connected to the side of the baffle on the rotating plate. The limiting plate is used to abut against the baffle so that when the lever drives the locking lever to unlock and the rotating plate rotates, the limiting plate pushes the baffle to rotate synchronously.

[0045] The advantages of the above technical solution are as follows: the baffle is also rotatably mounted on the support shaft, and the installation method is simple; a limit plate is connected to the side of the baffle on the rotating plate. When the lever drives the locking lever to unlock and the rotating plate rotates, the limit plate can push the baffle to rotate synchronously, thereby opening the input shaft, which is convenient and simple, and facilitates the processing and manufacturing of the rotating plate.

[0046] Furthermore, the end of the limiting plate is vertically connected to an extension plate extending in a direction away from the support shaft, and the second reset elastic element is a tension spring, with its two ends connected to the extension plate and the baffle respectively.

[0047] The beneficial effects of the above technical solution are as follows: the second reset elastic element is a tension spring, which is convenient to configure. At the same time, the end of the limiting plate is vertically connected to an extension plate, and the two ends of the tension spring are respectively connected to the extension plate and the baffle, which facilitates the installation of the tension spring. Attached Figure Description

[0048] Figure 1 This is a perspective view of Embodiment 1 of the three-station mechanism of the present invention (the three-station mechanism is in the closed position). Figure 2 This is a front view of Embodiment 1 of the three-station mechanism of the present invention (the three-station mechanism is in the closed position). Figure 3 This is a front view of Embodiment 1 of the three-station mechanism of the present invention (the three-station mechanism is in the unlocked state before the circuit breaker is opened). Figure 4 This is a front view of Embodiment 1 of the three-station mechanism of the present invention (the three-station mechanism is in the open position and the handle is not disengaged from the input shaft). Figure 5 This is a front view of Embodiment 1 of the three-station mechanism of the present invention (the three-station mechanism is in the open position and the handle is disengaged from the input shaft). Figure 6 for Figures 1-5 Structural diagram of the central locking disc; Figure 7 for Figures 1-5 Structural diagram of the transfer plate.

[0049] In the diagram: 1. Locking rod; 2. Bracket; 3. Return spring; 4. Rotating plate; 401. Flat plate; 402. Slot; 403. Through hole; 404. Limiting plate; 405. Extension plate; 406. Connecting plate; 5. Support shaft; 6. Tension spring; 7. Baffle; 8. Toggle lever; 9. Input shaft; 10. Support rod; 11. Locking disc; 111. Closing locking groove; 112. Opening locking groove; 113. Grounding locking groove; 114. Annular groove; 1141. Inner circumferential groove sidewall; 1142. Outer circumferential groove sidewall; 1143. Groove bottom wall; 115. Closing support groove; 116. Opening support groove; 117. Grounding support groove; 12. Closing / opening limit shaft; 13. Locking pin; 14. Nut. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0052] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0054] Embodiment 1 of the three-station mechanism in this invention: This embodiment improves the original locking device of the three-station mechanism by adding a support structure to the locking plate and a locking structure to the lever. When the lever is moved to unlock the locking rod, the support structure on the locking plate engages with the locking structure, and the reaction force of the reset elastic element keeps the locking structure in a balanced state, thus keeping the locking rod in the unlocked state. This eliminates the need for the operator to constantly apply force to the lever, reducing labor intensity and facilitating subsequent operation of the input shaft via the handle.

[0055] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the three-position mechanism is a manually controlled operating mechanism, including a frame, an input shaft 9 mounted on the frame, and a closing / opening limit shaft 12. The input shaft 9 is used to cooperate with the operating handle to switch the mechanism between the closed position, the open position, and the grounding position. The input shaft 9 and the closing / opening limit shaft 12 are connected by a gear pair. When the input shaft 9 rotates, the closing / opening limit shaft 12 rotates synchronously, which is the same as in the prior art.

[0056] The three-station mechanism also includes a self-resetting locking device, such as... Figures 1-4 As shown, the self-resetting locking device includes a locking disc 11 mounted on the opening / closing limit shaft 12, a locking rod 1 mounted on the frame, a lever 8 connected to the locking rod 1 for moving the locking rod 1 to unlock, and a first reset elastic element disposed between the locking rod 1 and the frame for deformation under force when the locking rod 1 is unlocked. Specifically, the frame includes a bracket 2, which includes upper and lower side plates and a vertical plate connected between the two side plates. The locking rod 1 passes through the upper and lower side plates of the bracket 2. The lever 8 passes through the vertical plate of the bracket 2 and the locking rod 1 and is fixedly connected to the locking rod 1. The vertical plate of the bracket 2 is provided with an elongated hole for the lever 8 to pass through and extend in the vertical direction, which can guide the vertical movement of the lever 8. The lever 8 has an external thread section, which passes through the locking rod 1 and is connected to a nut 14 to fix the lever 8 and the locking rod 1. The first reset elastic element is a reset spring 3 sleeved outside the locking rod 1. The lower end of the reset spring 3 abuts against the lever 8, and the upper end abuts against the upper side plate of the bracket 2. When the lever 8 drives the locking rod 1 to move upward, the reset spring 3 is compressed and deformed.

[0057] The locking disc 11 rotates synchronously with the opening and closing limit shaft 12, such as Figures 1-4 as well as Figure 6As shown, the locking disc 11 is provided with a closing locking groove 111, a closing locking groove 112, and a grounding locking groove 113, which correspond to the closing position, the opening position, and the grounding position, respectively, and into which the lower end of the locking rod 1 is inserted. When the three-position mechanism moves to the closing position, the opening position, or the grounding position, the corresponding locking groove moves to the position corresponding to the locking rod 1. Under the action of the return spring 3, the lower end of the locking rod 1 is inserted into the locking groove, thereby locking the closing, opening, or grounding state.

[0058] In addition, the locking disc 11 is also provided with an annular groove 114 coaxial with its own rotation axis, such as Figure 6 As shown, the annular groove 114 has an inner circumferential groove sidewall 1141, an outer circumferential groove sidewall 1142, and a groove bottom wall 1143 connecting the inner circumferential groove sidewall 1141 and the outer circumferential groove sidewall 1142. The inner circumferential groove sidewall 1141 is provided with a closing support groove 115, a closing support groove 116, and a grounding support groove 117 corresponding to the closing position, the opening position, and the grounding position, respectively. At the same time, the closing support groove 115, the opening support groove 116, and the grounding support groove 117 are all inferior arc-shaped grooves, and their orientations correspond to the closing locking groove 111, the opening locking groove 112, and the grounding locking groove 113, respectively.

[0059] The self-resetting locking device also includes a locking structure, such as... Figures 1-4 As shown, the locking structure includes a support rod 10 and a locking pin 13. One end of the support rod 10 is hinged to the lever 8, and the locking pin 13 is hinged to the other end of the support rod 10. The locking pin 13 extends into the annular groove 114 and is used to lock into the corresponding support groove, thereby engaging with the support groove. Therefore, the closing support groove 115, the opening support groove 116, and the grounding support groove 117 constitute the closing support structure, the opening support structure, and the grounding support structure, respectively.

[0060] In addition, such as Figures 1-4 As shown, the self-resetting locking device also includes a support shaft 5 fixed on the frame and a rotating plate 4 rotatably mounted on the support shaft 5, combined with... Figure 7As shown, the rotating plate 4 includes a flat plate 401 and an L-shaped connecting plate 406 connected to the flat plate 401. The flat plate 401 and the connecting plate 406 are respectively provided with through holes 403 for the support shaft 5 to pass through, allowing the rotating plate 4 to rotate around the support shaft 5. One end of the flat plate 401 is provided with a slot 402, through which the rotating plate 4 is secured to the outside of the lever 8, so that the rotating plate 4 can be pushed to rotate when the lever 8 moves. The self-resetting locking device also includes a baffle 7 rotatably mounted on the support shaft 5 and rotating synchronously with the rotating plate 4. The baffle 7 is also provided with through holes for the support shaft 5 to pass through. A limiting plate 404 is vertically connected to the side of the baffle 7 on the rotating plate 4. The limiting plate 404 is used to abut against the baffle 7. When the rotating plate 4 rotates clockwise, the limiting plate 404 can push the baffle 7 to rotate synchronously. Meanwhile, the end of the limiting plate 404 is vertically connected to an extension plate 405 that extends away from the support shaft 5. A second reset elastic element is connected between the baffle 7 and the rotating plate 4. The second reset elastic element is a tension spring 6. The extension plate 405 and the baffle 7 are respectively provided with hanging holes for installing the tension spring 6.

[0061] The working principle of the three-station mechanism in this embodiment is as follows: like Figure 2 As shown, when the three-position mechanism is in the closed position, the lower end of the locking rod 1 is inserted into the closing locking groove 111 to lock the closed state. At this time, the locking disc 11 cannot rotate, and the baffle 7 blocks the input shaft 9 of the three-position mechanism, so that the input shaft 9 cannot be connected to the operating handle for operation, that is, the position cannot be switched, thereby preventing damage to the three-position mechanism due to misoperation.

[0062] When the three-position mechanism needs to open the circuit breaker, the locking rod 1 should first be unlocked. This is done by moving the lever 8, which in turn moves the locking rod 1 upwards. During this process, the return spring 3 is compressed and deformed. Simultaneously, the support rod 10 moves with the lever 8, and the locking pin 13 moves within the annular groove 114. When the lower end of the locking rod 1 disengages from the closing locking groove 111, the support rod 10 moves to a vertical position, and the locking pin 13 moves to the position corresponding to the closing support groove 115. Figure 3 As shown, the locking pin 13 is engaged in the closing support groove 115, and the reaction force of the return spring 3 keeps the support rod 10 in a balanced state, thereby keeping the locking rod 1 in the unlocked state. At this time, the operator no longer needs to apply force to the lever 8. That is to say, when the lever 8 is moved, it is only necessary to overcome the elastic force of the return spring 3 for a short time. As long as the support rod 10 moves with the lever 8 until the locking pin 13 can be supported on the closing support groove 115, the lever 8 can be released. It is not necessary to continuously overcome the elastic force of the return spring 3, thus reducing the labor intensity of the operator.

[0063] Furthermore, as the lever 8 moves upward, it can push the rotating plate 4 to rotate clockwise, causing the limiting plate 404 to push the baffle 7 to rotate synchronously, thereby opening the input shaft 9. Figure 3 As shown, the operating handle can then be used in conjunction with the input shaft 9 to perform the circuit breaker opening operation, ensuring both operational safety and the normal functioning of the three-position mechanism. Furthermore, during the docking of the handle with the input shaft 9, since the locking lever 1 remains in the unlocked state, the operator can calmly and easily pick up the handle and engage the input shaft 9, opening the circuit breaker by rotating the input shaft 9, making the operation very convenient.

[0064] It should be noted that the rotation of the input shaft 9 means the rotation of the locking disc 11. The torque on the input shaft 9 is transmitted to the locking disc 11. As long as the closing support groove 115 disengages the locking pin 13, the locking disc 11 can rotate smoothly. At this time, the balance of the support rod 10 is broken, and the locking rod 1 is temporarily pressed against the outer circumference of the locking disc 11 under the reaction force of the return spring 3. Figure 4 As shown, until the tripping locking groove 112 rotates to its corresponding position, the locking rod 1, under the action of the reset spring 3, inserts into the tripping locking groove 112, at which point the tripping is complete, and the locking rod 1 achieves self-resetting locking. During this process, the locking pin 13 still moves within the annular groove 114. Simultaneously, because the lever 8 automatically moves down to reset, it drives the rotating plate 4 to rotate counterclockwise. Since the handle is still connected to the input shaft 9, the baffle 7 cannot reset with the rotating plate 4, but instead presses against the handle, causing the tension spring 6 to deform. Thus, once the handle is removed, the baffle 7 can reset under the reaction force of the tension spring 6. Figure 5 As shown, the input shaft 9 is returned to the blocked state to avoid accidental operation of the input shaft 9 in the open state. Only when the locking lever 1 is unlocked next time can the baffle 7 rotate with the rotating plate 4 to allow the input shaft 9 to open again.

[0065] The above process describes the operation from closing to opening. The operation from opening to grounding is basically similar. Of course, before grounding, the locking rod 1 needs to be unlocked first. After unlocking, the locking pin 13 is engaged in the opening support groove 116. When the three-position mechanism is grounded, the locking rod 1 is inserted into the grounding locking groove 113. The processes from grounding to opening and from opening to closing are reversed, but the principle is the same, and will not be described in detail in this invention.

[0066] In summary, this invention, by connecting a locking structure to the lever 8 and providing a supporting groove on the locking disc 11, allows the corresponding supporting groove to support the locking pin 13 when the lever 8 is moved to unlock the locking rod 1. Combined with the reaction force of the return spring 3, this keeps the support rod 10 in a balanced state, thus keeping the locking rod 1 in the unlocked state. This eliminates the need for the operator to continuously apply force to the lever 8, reducing labor intensity and facilitating subsequent operation of the input shaft 9 via the handle. Furthermore, only by unlocking the locking rod 1 can the rotating plate 4 rotate, thereby driving the baffle 7 to rotate and clear the input shaft 9, before it can engage with the handle. This effectively solves the problem of misoperation caused by the locking device of the three-position mechanism not being unlocked.

[0067] Embodiment 2 of the three-station mechanism in this invention: This embodiment provides a second reset elastic element in a different form. Unlike Embodiment 1, the second reset elastic element in this embodiment is a rubber band. At this time, there is no need to set a hanging hole. The rubber band can be directly tied or glued to the extension plate and the baffle.

[0068] Embodiment 3 of the three-station mechanism in this invention: This embodiment provides a second reset elastic element in a different form. Unlike Embodiment 1, the second reset elastic element in this embodiment is a compression spring. The compression spring is set on the side of the baffle near the lever. When the rotating plate resets with the lever, the baffle presses against the handle, causing the compression spring to be compressed, thereby providing reset power for the baffle to reset after the handle is moved out.

[0069] Embodiment 4 of the three-station mechanism in this invention: This embodiment provides a different installation method for the baffle. Unlike Embodiment 1, the baffle is not installed on the support shaft, but is installed on the rotating plate separately through the rotating shaft. It also rotates synchronously with the rotating plate under the action of the limiting plate, and can rotate relative to the rotating plate using the second reset elastic element.

[0070] Embodiment 5 of the three-station mechanism in this invention: This embodiment provides different limiting methods for the baffle. Unlike Embodiment 1, the limiting plate is not vertically connected to the rotating plate. Instead, the limiting post is directly fixed on the rotating plate, and the baffle is pushed to rotate synchronously by the limiting post.

[0071] Embodiment 6 of the three-station mechanism in this invention: This embodiment provides a self-resetting locking device with different structural compositions. Unlike Embodiment 1, the self-resetting locking device in this embodiment does not include a support shaft, a rotating plate, or a baffle, and does not have the function of covering the input shaft.

[0072] Embodiment 7 of the three-station mechanism in this invention: This embodiment provides a different fixed connection method between the lever and the locking lever. Unlike Embodiment 1, the lever passes through the locking lever and is directly welded to the locking lever. That is, the lever does not have an external thread section and does not need to use a nut.

[0073] Embodiment 8 of the three-station mechanism in this invention: This embodiment provides a different installation method for the reset spring. Unlike Embodiment 1, one end of the reset spring does not abut against the lever, but an annular boss is provided on the outer circumferential surface of the locking lever, and one end of the reset spring abuts against the annular boss.

[0074] Embodiment 9 of the three-station mechanism in this invention: This embodiment provides different installation methods for the locking pin. Unlike Embodiment 1, the locking pin is fixed on the support rod and cannot rotate around the support rod.

[0075] Embodiment 10 of the three-station mechanism in this invention: This embodiment provides different shapes of support grooves. Unlike Embodiment 1, the closing support groove, the opening support groove, and the grounding support groove are all semi-circular arc-shaped grooves.

[0076] Embodiment 11 of the three-station mechanism in this invention: This embodiment provides different composition forms of the clamping structure and different structural forms of the locking disc. Unlike Embodiment 1, the clamping structure in this embodiment does not include a clamping pin, but only a support rod. In this embodiment, the locking disc is stepped, including a large disc section and a small shaft section. The closing locking groove, the opening locking groove, and the grounding locking groove are all provided on the large disc section. The closing support groove, the opening support groove, and the grounding support groove are all provided on the outer peripheral surface of the small shaft section. At this time, each support groove can directly support and cooperate with the end of the support rod, and the support rod directly constitutes the clamping structure.

[0077] Embodiment 12 of the three-station mechanism in this invention: This embodiment provides different forms of closing support structure, opening support structure and grounding support structure. Unlike Embodiment 1, the closing support structure, opening support structure and grounding support structure in this embodiment are closing support protrusion, opening support protrusion and grounding support protrusion, respectively, and the clamping structure is a clamping groove. At this time, the clamping groove cooperates with the support protrusion and can play the same role as in Embodiment 1.

[0078] Embodiment 13 of the three-station mechanism in this invention: This embodiment provides a first reset elastic element in a different form. Unlike Embodiment 1, the first reset elastic element is an elastic rubber sleeve.

[0079] The embodiment of the self-resetting locking device of the three-station mechanism in this invention is as follows: The specific structure of the self-resetting locking device of the three-station mechanism is the same as that of the self-resetting locking device in the above embodiment of the three-station mechanism, and will not be repeated here.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A self-resetting locking device for a three-station mechanism, characterized in that, include: A locking disc is used to be installed on the opening and closing limit shaft of the three-position mechanism, and a locking rod is used to be installed on the frame of the three-position mechanism. The locking disc is provided with locking grooves that correspond to the closing position, opening position and grounding position respectively and allow the locking rod to be movably inserted. A lever is connected to the locking rod to drive the locking rod to move away from the locking groove. A first reset elastic element is provided between the locking rod and the frame. The three-position mechanism self-resetting locking device also includes a locking structure, which includes a support rod and a locking pin. One end of the support rod is hinged to the lever, and the locking pin is installed at the other end of the support rod. The locking disc has an annular groove coaxial with its own rotation axis. The annular groove has an inner circumferential groove sidewall. The inner circumferential groove sidewall has a closing support groove, a closing support groove, and a grounding support groove corresponding to the closing position, the opening position, and the grounding position, respectively. The locking pin extends into the annular groove to engage with the corresponding support groove when the locking rod is separated from the locking groove. The first reset elastic element is used to drive the lever to move towards the locking groove when the locking pin is separated from the support groove, so that the locking rod is inserted into the locking groove.

2. The self-resetting locking device for a three-station mechanism according to claim 1, characterized in that: The frame includes a support, which includes upper and lower side plates and a vertical plate connected between the two side plates. A locking rod passes through the upper and lower side plates of the support, and a lever passes through the vertical plate of the support and the locking rod and is fixedly connected to the locking rod. The vertical plate of the support is provided with an elongated hole for the lever to pass through and extending in the vertical direction. The elongated hole can guide the vertical movement of the lever.

3. The self-resetting locking device for a three-station mechanism according to claim 2, characterized in that: The lever has an external thread section, which passes through the locking rod and connects to the nut to fix the lever and the locking rod.

4. The self-resetting locking device for a three-station mechanism according to claim 1, characterized in that: The closing support groove, opening support groove, and grounding support groove are all inferior arc-shaped grooves.

5. The self-resetting locking device for a three-station mechanism according to claim 1, characterized in that: The pin is hinged to the support rod.

6. The self-resetting locking device for a three-station mechanism according to claim 2 or 3, characterized in that: The first reset elastic element is a reset spring sleeved on the locking rod, with one end of the reset spring abutting against the lever and the other end abutting against the frame.

7. The self-resetting locking device for a three-station mechanism according to any one of claims 1 to 5, characterized in that: The three-station mechanism self-resetting locking device also includes a support shaft for fixing on the frame and a rotating plate rotatably mounted on the support shaft. The rotating plate is provided with a slot, and the lever engages with the slot to push the rotating plate to rotate when the lever moves. The three-station mechanism self-resetting locking device also includes a baffle rotatably mounted on the support shaft or the rotating plate and rotating synchronously with the rotating plate. The baffle is used to block the input shaft of the three-station mechanism when the locking lever is inserted into the corresponding locking groove, so that the input shaft cannot be connected to the operating handle. The baffle is also used to allow the input shaft to move away from the locking groove as the lever moves the locking lever away from the locking groove, so that the input shaft can be connected to the operating handle. A second reset elastic element is connected between the baffle and the rotating plate.

8. The self-resetting locking device for a three-station mechanism according to claim 7, characterized in that: The baffle and the rotating plate are rotatably mounted on the support shaft. A limiting plate is connected to the side of the baffle on the rotating plate. The limiting plate is used to abut against the baffle so that when the lever drives the locking lever to unlock and the rotating plate rotates, the limiting plate pushes the baffle to rotate synchronously.

9. The self-resetting locking device for a three-station mechanism according to claim 8, characterized in that: The end of the limiting plate is vertically connected to an extension plate that extends away from the support shaft. The second reset elastic element is a tension spring, and the two ends of the tension spring are connected to the extension plate and the baffle, respectively.

10. A three-station mechanism, characterized in that, include: The device includes a frame, an input shaft mounted on the frame, a closing / opening limit shaft, and a self-resetting locking device for a three-position mechanism. The self-resetting locking device for the three-position mechanism includes a locking disc mounted on the closing / opening limit shaft of the three-position mechanism and a locking rod mounted on the frame of the three-position mechanism. The locking disc has locking grooves corresponding to the closing, opening, and grounding positions, respectively, allowing the locking rod to be movably inserted. A lever is connected to the locking rod to move it away from the locking grooves. A first reset elastic element is provided between the locking rod and the frame. The self-resetting locking device for the three-position mechanism also includes a locking support structure. The support structure includes a support rod and a locking pin. One end of the support rod is hinged to the lever, and the locking pin is installed at the other end of the support rod. The locking disc has an annular groove coaxial with its own rotation axis. The annular groove has an inner circumferential groove sidewall. The inner circumferential groove sidewall has a closing support groove, a closing support groove, and a grounding support groove corresponding to the closing position, the opening position, and the grounding position, respectively. The locking pin extends into the annular groove to engage with the corresponding support groove when the locking rod is separated from the locking groove. The first reset elastic element is used to drive the lever to move towards the locking groove when the locking pin is separated from the support groove, so that the locking rod is inserted into the locking groove.

11. The three-station mechanism according to claim 10, characterized in that, The frame includes a support, which includes upper and lower side plates and a vertical plate connected between the two side plates. A locking rod passes through the upper and lower side plates of the support, and a lever passes through the vertical plate of the support and the locking rod and is fixedly connected to the locking rod. The vertical plate of the support is provided with an elongated hole for the lever to pass through and extending in the vertical direction. The elongated hole can guide the vertical movement of the lever.

12. The three-station mechanism according to claim 11, characterized in that, The lever has an external thread section, which passes through the locking rod and connects to the nut to fix the lever and the locking rod.

13. The three-station mechanism according to claim 10, characterized in that, The closing support groove, opening support groove, and grounding support groove are all inferior arc-shaped grooves.

14. The three-station mechanism according to claim 10, characterized in that, The pin is hinged to the support rod.

15. The three-station mechanism according to claim 11 or 12, characterized in that, The first reset elastic element is a reset spring sleeved on the locking rod, with one end of the reset spring abutting against the lever and the other end abutting against the frame.

16. The three-station mechanism according to any one of claims 10 to 14, characterized in that, The three-station mechanism self-resetting locking device also includes a support shaft for fixing on the frame and a rotating plate rotatably mounted on the support shaft. The rotating plate is provided with a slot, and the lever engages with the slot to push the rotating plate to rotate when the lever moves. The three-station mechanism self-resetting locking device also includes a baffle rotatably mounted on the support shaft or the rotating plate and rotating synchronously with the rotating plate. The baffle is used to block the input shaft of the three-station mechanism when the locking lever is inserted into the corresponding locking groove, so that the input shaft cannot be connected to the operating handle. The baffle is also used to allow the input shaft to move away from the locking groove as the lever moves the locking lever away from the locking groove, so that the input shaft can be connected to the operating handle. A second reset elastic element is connected between the baffle and the rotating plate.

17. The three-station mechanism according to claim 16, characterized in that, The baffle and the rotating plate are rotatably mounted on the support shaft. A limiting plate is connected to the side of the baffle on the rotating plate. The limiting plate is used to abut against the baffle so that when the lever drives the locking lever to unlock and the rotating plate rotates, the limiting plate pushes the baffle to rotate synchronously.

18. The three-station mechanism according to claim 17, characterized in that, The end of the limiting plate is vertically connected to an extension plate that extends away from the support shaft. The second reset elastic element is a tension spring, and the two ends of the tension spring are connected to the extension plate and the baffle, respectively.

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