Reverse operation limiting structure for slow-acting double-shaft three-station mechanism

Abstract

The invention discloses a reverse operation limiting structure for a slow-acting double-shaft three-station mechanism, which relates to the technical field of accessories of medium-voltage gas insulated metal-enclosed switchgear and comprises a mechanism bracket, a locking part and a limiting part. The mechanism support is rotatably connected with an indication shaft, a grounding operation shaft and an isolation operation shaft, and linkage is realized through a gear set. The locking part is matched with the elastic pin assembly through the locking disc, and locking of the indicating shaft is achieved. The limiting part is of an elastic locking structure, is arranged at the ends, penetrating out of the mechanism front plate, of the grounding operation shaft and the isolation operation shaft, is in an unlocking state when no external force is applied to the operation handle, and can limit the rotation angle of the operation shaft after the external force is applied. The limiting part is arranged at the foremost end of the operation shaft, so that timely and reliable mechanical limiting of reverse misoperation is realized, damage to a mechanism transmission part and a switch body is effectively prevented, and operation safety is guaranteed. The structure is ingenious, the number of parts is small, the occupied space is small, the reliability is remarkably improved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medium voltage gas insulated metal enclosed switchgear accessories, and more particularly to a reverse operation limiting structure for a slow-motion double-shaft three-position mechanism. BACKGROUND

[0002] In the domestic field of medium voltage gas insulated ring network metal enclosed switchgear (referred to as ring network cabinet), in order to ensure the safety and reliability of the operation of the equipment, the switch is usually designed with five anti-interlock functions to prevent misoperation of the operation and maintenance personnel. At present, the double-shaft three-position mechanism widely used in ring network cabinets is mostly a fast-motion structure, which is suitable for a three-position switch of a swing knife type. However, the fast-motion mechanism has a large wear on the swing knife or the conductive rod during operation, especially after withstanding a closing test, which is likely to affect the current-carrying performance and temperature rise characteristics at the contact, and thus adversely affect the mechanical life and electrical life of the switch.

[0003] In recent years, some domestic manufacturers have developed a conductive rod type slow-motion three-position switch based on a gear and rack transmission mode, and a slow-motion double-shaft three-position mechanism is used in conjunction. Compared with the fast-motion mechanism, the slow-motion mechanism has advantages in operation stability and life, but it also brings new technical challenges: the direction of the operation shaft must be accurately and reliably mechanically limited and locked to ensure that the three-position mechanism operates correctly and reliably during operation, to avoid damage to the mechanism transmission parts or the switch body due to reverse misoperation, and to protect the safety of the operation and maintenance personnel.

[0004] In the prior art, the limiting structure design for the slow-motion three-position mechanism is not perfect, and there are problems such as complex structure, large space occupation, many parts, difficult assembly and debugging, etc. Therefore, there is an urgent need for a reverse operation limiting scheme with simple structure, timely and reliable limiting, easy assembly and low cost to meet the high reliability requirements of the slow-motion double-shaft three-position mechanism in actual application. SUMMARY

[0005] Therefore, the present application provides a reverse operation limiting structure for a slow-motion double-shaft three-position mechanism to solve the above technical problems.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0007] A reverse operation limiting structure for a slow-motion double-shaft three-position mechanism, comprising:

[0008] The mechanism support is provided with an indicating shaft, a grounding operation shaft and an isolation operation shaft which are rotationally connected to the mechanism support, the grounding operation shaft and the isolation operation shaft are located on two sides of the indicating shaft, an indicating shaft transmission gear is fixedly sleeved on the indicating shaft, a grounding shaft transmission gear and an isolation shaft transmission gear which are engaged with the indicating shaft transmission gear are respectively sleeved on the grounding operation shaft and the isolation operation shaft, and one end of the indicating shaft, the grounding operation shaft and the isolation operation shaft penetrates through a mechanism front plate of the mechanism support.

[0009] A locking part is provided with a locking disc and an elastic pin assembly, the locking disc is fixedly sleeved on the indicating shaft, the locking disc is located on the outside of the mechanism front plate, the edge of the locking disc is provided with a locking notch, the elastic pin assembly is connected to the outer plate surface of the mechanism front plate, the locking rod of the elastic pin assembly can be inserted into the locking notch, and the locking rod can lock the indicating shaft.

[0010] A limiting part is connected to the end of the grounding operation shaft and the isolation operation shaft which penetrates through the mechanism front plate, the limiting part is an elastic locking structure, when the limiting part is in an unlocking state under no external force, the rotation of the grounding operation shaft and the isolation operation shaft is not limited by the limiting part, and when the limiting part is under external force, the rotation angle of the grounding operation shaft and the isolation operation shaft can be limited.

[0011] When the grounding operation shaft or the isolation operation shaft needs to be rotationally adjusted, the locking rod is first pulled out of the locking notch, external force is applied to the limiting part at the end of the grounding operation shaft or the isolation operation shaft, and then the grounding operation shaft or the isolation operation shaft is rotationally adjusted.

[0012] Through the above technical scheme, the elastic locking limiting part is directly arranged at the front end of the operation shaft, and cooperates with the indicating shaft locking part to realize accurate and timely mechanical limiting of the rotation direction of the operation shaft, effectively prevents damage of reverse misoperation to the mechanism transmission member and the switch body, the structure ingeniously uses the space at the end of the operation shaft to realize reliable locking with few parts and simple assembly, significantly improves the operation safety and the mechanism reliability, and reduces the production and maintenance costs.

[0013] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-station mechanism, the limiting part comprises a grounding operation shaft limiting block, a grounding operation shaft limiting sleeve and a grounding operation shaft return spring; the grounding operation shaft limiting block is an arc-shaped block fixed on the outer side of the front plate of the mechanism, and is concentrically arranged outside the grounding operation shaft; the grounding operation shaft limiting sleeve is axially slidably connected to the end of the grounding operation shaft, and the axial sliding displacement distance of the grounding operation shaft limiting sleeve is limited by a grounding limiting sleeve limiting screw; the grounding operation shaft limiting sleeve has a grounding operation shaft limiting protrusion extending towards the grounding operation shaft limiting block; and the grounding operation shaft return spring is sleeved on the grounding operation shaft and used to separate and unlock the grounding operation shaft limiting protrusion on the grounding operation shaft limiting sleeve from the grounding operation shaft limiting block.

[0014] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-station mechanism, the limiting part further comprises an isolation operation shaft limiting block, an isolation operation shaft limiting sleeve and an isolation operation shaft return spring; the isolation operation shaft limiting block is an arc-shaped block fixed on the outer side of the front plate of the mechanism, and is concentrically arranged outside the isolation operation shaft; the isolation operation shaft limiting sleeve is axially slidably connected to the end of the isolation operation shaft, and the axial sliding displacement distance of the isolation operation shaft limiting sleeve is limited by an isolation limiting sleeve limiting screw; the isolation operation shaft limiting sleeve has an isolation operation shaft limiting protrusion extending towards the isolation operation shaft limiting block; and the isolation operation shaft return spring is sleeved on the isolation operation shaft and used to separate and unlock the isolation operation shaft limiting protrusion on the isolation operation shaft limiting sleeve from the isolation operation shaft limiting block.

[0015] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-station mechanism, when the grounding operation shaft limiting sleeve presses the grounding operation shaft return spring to move close to the grounding operation shaft limiting block under external force, the side wall of the grounding operation shaft limiting protrusion abuts against the side wall of the grounding operation shaft limiting block, so that the grounding operation shaft can only rotate counterclockwise; and when the isolation operation shaft limiting sleeve presses the isolation operation shaft return spring to move close to the isolation operation shaft limiting block under external force, the side wall of the isolation operation shaft limiting protrusion abuts against the side wall of the isolation operation shaft limiting block, so that the isolation operation shaft can only rotate clockwise.

[0016] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-station mechanism, the operation handle has a hexagonal hole at the end for inserting into the end of the grounding operation shaft or the isolation operation shaft, and the other end of the operation handle has a grip rod arranged perpendicularly thereto.

[0017] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-position mechanism, the end of the indicating shaft is connected with an indicating shaft baffle, and the edge of the indicating shaft baffle has a notch for avoiding the insertion of the operation handle.

[0018] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-position mechanism, the locking part further comprises a locking rod support fixed on the outer plate surface of the mechanism front plate, the locking rod is slidingly connected on the locking rod support, a locking rod return spring is sleeved on the locking rod, the locking rod is inserted into the locking notch under the action of the locking rod return spring, the side wall of the locking rod is radially fixed with a locking lever, the locking lever penetrates through the locking rod support, and the locking rod and the locking notch can be unlocked by pulling the locking lever.

[0019] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-position mechanism, a sliding groove is formed in the locking rod support for slidingly limiting the locking lever.

[0020] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-position mechanism, the number of the locking notches on the locking disc is three, and each is used for locking and positioning in the isolated state, the grounded state and the isolated and connected state.

[0021] Preferably, in the reverse operation limiting structure for the slow-moving double-shaft three-position mechanism, the locking disc is a disc structure with different diameters, the diameter of the disc between the grounded state and the isolated and connected state is greater than the diameter of the disc on the other side, so that the locking disc is abutted and limited by the locking rod after being rotated in place.

[0022] According to the above technical solution, compared with the prior art, the reverse operation limiting structure for the slow-moving double-shaft three-position mechanism is provided, which ingeniously uses the local structure of the existing operation shaft end, cooperates with the form of the sliding block structure and the spiral spring, realizes the flexible intervention or withdrawal of the limiting sleeve with the least parts and the smallest space occupation, meets the reverse limiting function requirement during operation, and has the advantages that the limiting structure is designed at the most front end of the operation input shaft, the limiting is more timely and reliable, the reverse operation limiting principles of the isolated operation shaft and the grounded operation shaft are the same, the limiting parts are the same, the mechanism parts are unified to the greatest extent, the assembly is simple, no debugging is needed, the production efficiency is high, the production cost is low, the market competitiveness is strong, the structure can be applied to the three-position mechanism limiting operation of similar related products, has good popularization and application, and can bring great economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to explain the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0024] Figure 1 The accompanying drawings are structural schematic diagrams of the left side angle of the reverse operation limiting structure provided by the present application;

[0025] Figure 2 The accompanying drawings are structural schematic diagrams of the right side angle of the reverse operation limiting structure provided by the present application;

[0026] Figure 3 The accompanying drawings are front views of the reverse operation limiting structure provided by the present application;

[0027] Figure 4 The accompanying drawings are top views of the reverse operation limiting structure provided by the present application;

[0028] Figure 5 The accompanying drawings are structural schematic diagrams of the left side angle of the grounding operation shaft part of the reverse operation limiting structure provided by the present application;

[0029] Figure 6 The accompanying drawings are structural schematic diagrams of the right side angle of the grounding operation shaft part of the reverse operation limiting structure provided by the present application;

[0030] Figure 7 The accompanying drawings are structural schematic diagrams of the left side angle of the isolation operation shaft connecting operation handle provided by the present application;

[0031] Figure 8 The accompanying drawings are structural schematic diagrams of the left side angle of the isolation operation shaft connecting operation handle provided by the present application; Figure 7 The accompanying drawings are enlarged views of the grounding operation shaft part of the reverse operation limiting structure provided by the present application;

[0032] Figure 9 The accompanying drawings are structural schematic diagrams of the left side angle of the isolation operation shaft connecting operation handle provided by the present application;

[0033] Figure 10 The accompanying drawings are structural schematic diagrams of the left side angle of the isolation operation shaft connecting operation handle provided by the present application; Figure 9 The accompanying drawings are enlarged views of the isolation operation shaft part of the reverse operation limiting structure provided by the present application;

[0034] Figure 11 The accompanying drawings are structural schematic diagrams of the left side angle of the isolation operation shaft connecting operation handle provided by the present application;

[0035] Figure 12 The accompanying drawings are structural schematic diagrams of the left side angle of the isolation operation shaft connecting operation handle provided by the present application; Figure 11 The accompanying drawings are enlarged views of the grounding operation shaft part of the reverse operation limiting structure provided by the present application;

[0036] Figure 13 The drawing is a structural schematic diagram of the right side angle of the ground operation shaft connecting the operation handle and applying force to compress the state provided by the present application.

[0037] Figure 14 The drawing is a structural schematic diagram of the ground operation shaft provided by the present application. Figure 13 An enlarged view of the partitioned operation shaft part;

[0038] Figure 15 The drawing is a structural schematic diagram of the indicating shaft provided by the present application.

[0039] Wherein:

[0040] 011-ground operation shaft limiting sleeve; 012-ground operation shaft reset spring; 013-ground operation shaft limiting block; 014-ground limiting sleeve limiting screw; 015-ground shaft transmission gear; 016-ground operation shaft; 017-ground operation shaft limiting protrusion;

[0041] 021-isolation operation shaft limiting sleeve; 022-isolation operation shaft reset spring; 023-isolation operation shaft limiting block; 024-isolation limiting sleeve limiting screw; 025-isolation shaft transmission gear; 026-isolation operation shaft; 027-isolation operation shaft limiting protrusion;

[0042] 03-mechanism front plate;

[0043] 041-locking disc; 042-indicating shaft; 043-indicating shaft transmission gear; 044-indicating shaft baffle; 045-locking notch; 046-avoidance notch;

[0044] 051-locking lever; 052-locking rod; 053-locking rod support; 054-locking rod reset spring; 055-sliding groove;

[0045] 06-operation handle; 061-grip lever. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0047] Referring to the drawings Figure 1 to the drawings Figure 6 and the drawings Figure 15 The embodiments of the present application disclose a reverse operation limiting structure for a slow-motion double-shaft three-station mechanism, which comprises:

[0048] The mechanism support is provided with an indicating shaft 042, a grounding operation shaft 016 and an isolation operation shaft 026 rotatably connected to the mechanism support, the grounding operation shaft 016 and the isolation operation shaft 026 are located on both sides of the indicating shaft 042, the indicating shaft 042 is fixedly sleeved with an indicating shaft transmission gear 043, the grounding operation shaft 016 and the isolation operation shaft 026 are respectively sleeved with a grounding shaft transmission gear 015 and an isolation shaft transmission gear 025 which are engaged with the indicating shaft transmission gear 043; one end of the indicating shaft 042, the grounding operation shaft 016 and the isolation operation shaft 026 penetrates through the mechanism front plate 03 of the mechanism support;

[0049] The locking part comprises a locking disc 041 and an elastic pin assembly; the locking disc 041 is fixedly sleeved on the indicating shaft 042, the locking disc 041 is located on the outer side of the mechanism front plate 03, and the edge of the locking disc 041 is provided with a locking notch 045, the elastic pin assembly is connected to the outer side surface of the mechanism front plate 03, and the locking rod 052 of the elastic pin assembly can be inserted into the locking notch 045 and realize the locking of the indicating shaft 042;

[0050] The limiting part is connected to the end of the grounding operation shaft 016 and the isolation operation shaft 026 which penetrates through the mechanism front plate 03, and the limiting part is an elastic locking structure: when the limiting part is in an unlocking state under no external force, the rotation of the grounding operation shaft 016 and the isolation operation shaft 026 is not limited by the limiting part, and when the limiting part is under external force, the rotation angle of the grounding operation shaft 016 and the isolation operation shaft 026 can be limited;

[0051] When it is needed to rotate and adjust the grounding operation shaft 016 or the isolation operation shaft 026, the locking rod 052 is first pulled out of the locking notch 045, and external force is applied to the limiting part at the end of the grounding operation shaft 016 or the isolation operation shaft 026, so as to rotate and adjust the grounding operation shaft 016 or the isolation operation shaft 026.

[0052] Referring to the accompanying drawings Figure 5 , the accompanying drawings Figure 6 , the accompanying drawings Figure 8 , the accompanying drawings Figure 10 , the accompanying drawings Figure 13 , the accompanying drawings Figure 14The limiting part comprises a grounding operation shaft limiting block 013, a grounding operation shaft limiting sleeve 011 and a grounding operation shaft reset spring 012. The grounding operation shaft limiting block 013 is an arc-shaped block and is fixed on the outer side surface of the mechanism front plate 03, and is concentrically arranged on the outer side of the grounding operation shaft 016. The grounding operation shaft limiting sleeve 011 is axially slidably connected to the end of the grounding operation shaft 016, and the axial sliding displacement distance thereof is limited by the grounding limiting sleeve limiting screw 014. The grounding operation shaft limiting sleeve 011 has a grounding operation shaft limiting protrusion 017 extending towards the grounding operation shaft limiting block 013. The grounding operation shaft reset spring 012 is sleeved on the grounding operation shaft 016 and is used to separate and unlock the grounding operation shaft limiting protrusion 017 on the grounding operation shaft limiting sleeve 011 from the grounding operation shaft limiting block 013.

[0053] In order to further optimize the above technical scheme, when the grounding operation shaft limiting sleeve 011 is pressed to approach the grounding operation shaft limiting block 013 under the action of external force, the side wall of the grounding operation shaft limiting protrusion 017 abuts against the side wall of the grounding operation shaft limiting block 013, so that the grounding operation shaft 016 can only rotate counterclockwise. When the isolation operation shaft limiting sleeve 021 is pressed to approach the isolation operation shaft limiting block 023 under the action of external force, the side wall of the isolation operation shaft limiting protrusion 027 abuts against the side wall of the isolation operation shaft limiting block 023, so that the isolation operation shaft 026 can only rotate clockwise.

[0054] Referring to the accompanying drawings Figure 7 , the accompanying drawings Figure 9 and the accompanying drawings Figure 11 , the operation handle 06 has a hexagonal hole at the end for inserting into the end of the grounding operation shaft 016 or the isolation operation shaft 026, and the other end of the operation handle 06 has a grip rod 061 arranged perpendicularly thereto.

[0055] Referring to the accompanying drawings Figure 7 , the end of the indicating shaft 042 is connected with an indicating shaft baffle 044, and the edge of the indicating shaft baffle 044 has a avoiding slot 046 for avoiding the insertion of the operation handle 06.

[0056] Referring to the accompanying drawings Figure 2 to the accompanying drawings Figure 4The locking part further comprises a locking rod support 053 fixed on the outer side plate surface of the mechanism front plate 03, the locking rod 052 is slidingly connected to the locking rod support 053, and the locking rod 052 is sleeved with a locking rod return spring 054, the locking rod 052 is inserted into the locking slot 045 under the action of the locking rod return spring 054, the side wall of the locking rod 052 is fixed with a locking lever 051 in the radial direction, the locking lever 051 penetrates through the locking rod support 053, and the locking rod 052 and the locking slot 045 can be unlocked by pulling the locking lever 051.

[0057] In order to further optimize the above technical scheme, the locking rod support 053 is provided with a sliding groove 055 for sliding limiting the locking lever 051.

[0058] In the embodiment, the number of the locking slots 045 on the locking disc 041 is three, and the locking slots 045 are respectively used for locking and positioning in the isolated split state, the grounding state and the isolated connection state.

[0059] In order to further optimize the above technical scheme, the locking disc 041 is a disc structure with different diameters, the diameter of the disc between the grounding state and the isolated connection state is greater than the diameter of the disc on the other side, so that the locking disc 041 is abutted and limited after being rotated to the position.

[0060] The specific use method of the reverse operation limiting function provided by the embodiment is as follows:

[0061] 1) When the three-position mechanism is in the isolated split state, the locking rod 052 is inserted into the locking slot 045 of the locking disc 041 to the left under the action of the locking rod return spring 054, the indicating shaft 042 of the three-position mechanism is in the locked state, and at this time, the isolation operation shaft 026 and the grounding operation shaft 016 cannot be rotated.

[0062] 2) When the three-position mechanism is switched from the isolated split state to the grounding state, first, the locking lever 051 is pulled to the right to slide, so that the locking rod 052 is separated from the locking slot 045 of the locking disc 041, and the indicating shaft 042 is restored to the unlocked state, as shown in Figure 2 Then, the operation handle 06 is inserted into the grounding operation shaft 016, the operation handle 06 presses the grounding operation shaft limiting sleeve 011, so that the grounding operation shaft limiting sleeve 011 is guided by the outer hex surface at the front end of the grounding operation shaft 016, overcomes the grounding operation shaft return spring 012, and reaches the intervention position, at this time, the right side surface of the grounding operation shaft limiting protrusion 017 of the grounding operation shaft limiting sleeve 011 is in contact with the left side surface of the grounding operation shaft limiting block 013, as shown in Figure 11 to Figure 14The ground operation shaft 016 is not allowed to rotate in the clockwise direction at this time, and the ground operation shaft 016 can only rotate in the counterclockwise direction to the ground closing direction. With the counterclockwise rotation of the ground operation shaft 016, the ground shaft transmission gear 015 also rotates counterclockwise, and the indication shaft transmission gear 043 rotates clockwise in cooperation with it. When rotated to the specified angle, the locking groove 045 on the locking disc 041 is aligned with the locking rod 052, the locking rod 052 is inserted into the locking disc 041 under the action of the locking rod return spring 054, the ground closing action is completed, the operating handle 06 is withdrawn, and the ground operation shaft limiting sleeve 011 is withdrawn along the outer six aspects of the front end of the ground operation shaft 016 under the action of the ground operation shaft return spring 012. When the ground limiting sleeve limiting screw 014 contacts the waist round groove semicircular surface on the ground operation shaft 016, the ground operation shaft limiting sleeve 011 is withdrawn and stopped. When the three-position mechanism is in the grounding state to the isolation state process, the locking rod 052 is unlocked first, and then the operating handle 06 is inserted into the ground operation shaft 016. Rotate in the reverse direction as described above to the right side of the ground operation shaft limiting protrusion 017 of the ground operation shaft limiting sleeve 011 and the left side of the ground shaft limiting block 013. The locking rod 052 is inserted into the locking disc 041, so that the mechanism enters the isolation state, and the indicating shaft 042 enters the locked state. The operating handle 06 is withdrawn, and the action is completed.

[0063] 3) When the three-position mechanism is in the isolation state to the isolation state, first slide the locking lever 051 to the right to make the locking rod 052 out of the locking groove 045 of the locking disc 041, and restore the indicating shaft 042 to the unlocked state; Then insert the operating handle 06 into the isolation operation shaft 026, and press the isolation operation shaft limiting sleeve 021 with the operating handle 06 to guide it with the outer six aspects of the front end of the isolation operation shaft 026. Overcome the isolation operation shaft return spring 022 to reach the intervention position. At this time, the left side of the isolation operation shaft limiting protrusion 27 of the isolation operation shaft limiting sleeve 021 is in contact with the right side of the isolation shaft limiting block 023. See the attached Figure 7 to the attached Figure 10The isolation operation shaft 026 is not allowed to rotate in the counterclockwise direction in this state, so that the isolation operation shaft 026 can only rotate in the clockwise direction to the isolation closing direction. With the clockwise rotation of the isolation operation shaft 026, the isolation shaft transmission gear 025 also rotates clockwise, and the indication shaft gear 043 rotates counterclockwise in cooperation. When the specified angle is reached, the locking groove 045 on the locking disc 041 is aligned with the locking rod 052, and the locking rod 052 is inserted into the locking disc 041 under the action of the locking rod return spring 054. The isolation closing action is completed, the operating handle 06 is withdrawn, and the isolation operation shaft limiting sleeve 021 is withdrawn along the outer hexagonal surface of the front end of the isolation operation shaft 026 under the action of the isolation operation shaft return spring 022. When the isolation limiting sleeve limiting screw 024 contacts the waist round groove semicircular surface on the isolation operation shaft 026, the isolation operation shaft limiting sleeve 021 is withdrawn and stopped. During the process of the three-position mechanism from the isolation closing state to the isolation opening state, the locking rod 052 is unlocked first, and then the operating handle 06 is still inserted into the isolation operation shaft 026 and operated in the reverse direction as described above. When the left side of the isolation operation shaft limiting protrusion 27 of the isolation operation shaft limiting sleeve 021 is in contact with the right side of the isolation shaft limiting block 023, the locking rod 052 is inserted into the locking disc 041, so that the mechanism enters the isolation opening state, and the indication shaft 042 enters the locking state. The operating handle 06 is withdrawn, and the action is completed.

[0064] 4) When the operating handle 06 is inserted into one of the operation shafts and rotated, the limiting sleeve on the other operation shaft is in the withdrawn state and can rotate 360° without contacting the limiting block on the front plate.

[0065] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0066] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reverse operation limiting structure for a slow motion two-shaft three-station mechanism, characterized by, The utility model relates to a kind of ground isolation operation mechanism, including: Mechanism support, indicating shaft (042), ground operation shaft (016) and isolation operation shaft (026) are rotatably connected on the mechanism support, ground operation shaft (016) and isolation operation shaft (026) are located at the two sides of indicating shaft (042), indicating shaft (042) is fixedly sleeved with indicating shaft transmission gear (043) on it, ground shaft transmission gear (015) and isolation shaft transmission gear (025) are respectively sleeved with ground operation shaft (016) and isolation operation shaft (026) on it, and ground shaft transmission gear (015) and isolation shaft transmission gear (025) are engaged with indicating shaft transmission gear (043);The head of indicating shaft (042), ground operation shaft (016) and isolation operation shaft (026) is all out of the mechanism front plate (03) of the mechanism support; Locking portion, locking disc (041) and elastic pin assembly are included;Locking disc (041) is fixedly sleeved on indicating shaft (042), locking disc (041) is located at the outside of mechanism front plate (03), and the edge of locking disc (041) has locking notch (045), elastic pin assembly is connected on the outside panel of mechanism front plate (03), and the locking rod (052) of elastic pin assembly can be inserted into locking notch (045), and the locking of indicating shaft (042) is realized; Limiting portion is connected at the end of ground operation shaft (016) and isolation operation shaft (026) out of mechanism front plate (03), and the limiting portion is elastic locking structure: when the limiting portion is in unlocking state under no external force, the rotation of ground operation shaft (016) and isolation operation shaft (026) is not limited by the limiting portion, when the limiting portion can limit the rotation angle of ground operation shaft (016) and isolation operation shaft (026) under external force; When ground operation shaft (016) or isolation operation shaft (026) needs to be rotated and adjusted, first, locking rod (052) is extracted from locking notch (045), and external force is applied to the limiting portion of the end of ground operation shaft (016) or isolation operation shaft (026), so as to rotate and adjust ground operation shaft (016) or isolation operation shaft (026).

2. The reverse operation limiting structure for a slow-moving biaxial three-station mechanism according to claim 1, characterized in that, The limiting part comprises a grounding operation shaft limiting block (013), a grounding operation shaft limiting sleeve (011) and a grounding operation shaft reset spring (012); the grounding operation shaft limiting block (013) is an arc-shaped block and is fixed on the outer side surface of the mechanism front plate (03), and is concentrically arranged outside the grounding operation shaft (016); the grounding operation shaft limiting sleeve (011) is axially slidably connected to the end of the grounding operation shaft (016), and the axial sliding displacement distance thereof is limited by a grounding limiting sleeve limiting screw (014); the grounding operation shaft limiting sleeve (011) has a grounding operation shaft limiting protrusion (017) extending towards the grounding operation shaft limiting block (013); and the grounding operation shaft reset spring (012) is sleeved on the grounding operation shaft (016) and is used for separating and unlocking the grounding operation shaft limiting protrusion (017) on the grounding operation shaft limiting sleeve (011) from the grounding operation shaft limiting block (013).

3. The reverse operation limiting structure for a slow-moving biaxial three-station mechanism according to claim 2, characterized in that, The limiting part further comprises an isolation operation shaft limiting block (023), an isolation operation shaft limiting sleeve (021) and an isolation operation shaft reset spring (022); the isolation operation shaft limiting block (023) is an arc-shaped block and is fixed on the outer side surface of the mechanism front plate (03), and is concentrically arranged outside the isolation operation shaft (026); the isolation operation shaft limiting sleeve (021) is axially slidably connected to the end of the isolation operation shaft (026), and the axial sliding displacement distance thereof is limited by an isolation limiting sleeve limiting screw (024); the isolation operation shaft limiting sleeve (021) has an isolation operation shaft limiting protrusion (027) extending towards the isolation operation shaft limiting block (023); and the isolation operation shaft reset spring (022) is sleeved on the isolation operation shaft (026) and is used for separating and unlocking the isolation operation shaft limiting protrusion (027) on the isolation operation shaft limiting sleeve (021) from the isolation operation shaft limiting block (023).

4. The reverse operation limiting structure for a slow-moving biaxial three-station mechanism according to claim 3, characterized in that, When the grounding operation shaft limiting sleeve (011) is pressed to approach the grounding operation shaft limiting block (013) under the action of an external force and compresses the grounding operation shaft reset spring (012), the side wall of the grounding operation shaft limiting protrusion (017) abuts against the side wall of the grounding operation shaft limiting block (013), so that the grounding operation shaft (016) can only rotate counterclockwise; when the isolation operation shaft limiting sleeve (021) is pressed to approach the isolation operation shaft limiting block (023) under the action of an external force and compresses the isolation operation shaft reset spring (022), the side wall of the isolation operation shaft limiting protrusion (027) abuts against the side wall of the isolation operation shaft limiting block (023), so that the isolation operation shaft (026) can only rotate clockwise.

5. A reverse operation limiting structure for a slow-moving biaxial three-station mechanism according to claim 4, characterized in that, Also included is an operating handle (06), the end of which is provided with a hexagonal hole for plugging with the end of the grounding operating shaft (016) or the isolation operating shaft (026), and the other end of the operating handle (06) is provided with a grip (061) arranged perpendicularly thereto.

6. A reverse operation limiting structure for a slow-moving biaxial three-station mechanism according to claim 5, wherein The end of the indicating shaft (042) is connected with an indicating shaft baffle (044), the edge of the indicating shaft baffle (044) is provided with a notch (046) for avoiding the insertion of the operating handle (06).

7. A reverse operation limiting structure for a slow-moving biaxial three-station mechanism according to any one of claims 1 to 6, characterized in that, The locking portion further includes a locking rod support (053) fixed on the outer plate surface of the mechanism front plate (03), the locking rod (052) is slidingly connected on the locking rod support (053), and the locking rod (052) is sleeved with a locking rod return spring (054), the locking rod (052) is inserted into the locking notch (045) under the action of the locking rod return spring (054), the side wall of the locking rod (052) is radially fixed with a locking lever (051), the locking lever (051) penetrates through the locking rod support (053), and the locking lever (051) can be used to unlock the locking rod (052) and the locking notch (045) by being pulled.

8. A reverse operation limiting structure for a slow-moving biaxial three- station mechanism according to claim 7, characterized in that, The locking rod support (053) is provided with a sliding groove (055) for slidingly limiting the locking lever (051).

9. A reverse operation limiting structure for a slow-moving biaxial three- station mechanism according to claim 8, characterized in that, The number of the locking notches (045) on the locking disc (041) is three, and each is used for locking and positioning in the isolation split state, the grounding state and the isolation combined state.

10. A reverse operation limiting structure for a slow-moving biaxial three- station mechanism according to claim 9, wherein The locking disc (041) is a disc structure with different diameters, the disc diameter between the grounding state and the isolation combined state is greater than the disc diameter on the other side, so that the locking disc (041) is abutted and limited by the locking rod (052) after being rotated in place.

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