Three-station operating mechanism

Abstract

The invention discloses a three-station operating mechanism, which relates to the technical field of high-voltage switch cabinets and comprises a three-station panel, a connecting frame, a first mounting plate, a second mounting plate and a third mounting plate which are sequentially connected through internal threaded columns. A three-station gear unit is movably mounted between interlayers of the first mounting plate and the second mounting plate; a self-locking unit is mounted in an interlayer between the second mounting plate and the third mounting plate; the three-station gear unit abuts against the self-locking unit. And a three-station lock control unit is mounted in an interlayer between the three-station panel and the third mounting plate. According to the three-station operating mechanism, self-locking can be conducted when the three stations are in different states, unlocking can be achieved only when the three-station rotary knob is slid to the correct position by a worker, the safety of the operation process is enhanced, and potential safety hazards caused by operation errors are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switch cabinets, and in particular to a three-position operating mechanism. Background Art

[0002] The three-position operating mechanism is widely used in high-voltage ring network cabinets, and cooperates with circuit breakers to connect and disconnect the main circuit. The positioning self-locking mechanism keeps the three-position operating mechanism in the closed, open and grounded states, thereby ensuring the safe and stable operation of high-voltage power distribution. It is particularly important. When operating the three-position mechanism to open, close and ground, the operating mechanism is limited by the cooperation of the main pressure spring for opening and closing and the limit pillars on both sides to ensure the closed and open positions of the three-position disconnector and the grounding switch.

[0003] The current three-station mechanism does not have a self-locking device, or requires manual locking, which poses a risk of safety issues in actual applications.

[0004] How to develop a three-position operating mechanism that needs to be unlocked first when changing the state of the three-position mechanism, and the operating mechanism self-locks after the state of the three-position mechanism is changed, to provide safety and standardization of operation, has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a three-station operating mechanism to solve the problems listed in the background technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a three-station operating mechanism, comprising a three-station panel, a connecting frame, a first mounting plate, a second mounting plate and a third mounting plate, wherein the three-station panel, the connecting frame, the first mounting plate, the second mounting plate and the third mounting plate are sequentially connected by internal threaded columns, and a three-station gear unit is movably installed between the first mounting plate and the second mounting plate;

[0008] A self-locking unit is installed between the second mounting plate and the third mounting plate; the three-station gear unit abuts against the self-locking unit;

[0009] A three-station lock control unit is installed between the interlayer of the three-station panel and the third mounting plate.

[0010] Preferably, the three-position gear unit comprises an indicator disc gear, a grounding gear and a closing gear, wherein the indicator disc gear, the grounding gear and the closing gear are arranged in a herringbone shape, and the indicator disc gear, the grounding gear and the closing gear are meshed with each other, and a grounding shaft is fixedly mounted on the grounding gear, and a free end of the grounding shaft passes through the second mounting plate;

[0011] A closing shaft is fixedly mounted on the closing gear;

[0012] The indicating disc gear passes through the second mounting plate and the third mounting plate in sequence through the indicating disc rotating shaft, and an indicating disc limiting block is fixedly mounted on the indicating disc rotating shaft.

[0013] Preferably, the self-locking unit comprises a three-position lock operating plate, a three-position lock disk and a limit frame, a through hole is opened on the side of the limit frame close to the three-position lock disk, a guide column is installed on the inner side wall of the limit frame, a three-position lock core is installed on the free end of the guide column, a three-position lock core spring is sleeved on the outer circumferential surface of the guide column, one end of the three-position lock core spring abuts against the three-position lock core, and the other end of the three-position lock core spring abuts against the inner side wall of the limit frame; and the three-position lock core passes through the through hole and abuts against the three-position lock disk; the three-position lock disk is fixedly installed on the grounding shaft;

[0014] One end of the three-station lock operating plate is hinged to the three-station lock core, and the middle part of the three-station lock operating plate is hinged to the limit frame through a connecting ear.

[0015] Preferably, the self-locking unit further comprises a three-position lock core limit plate spring and a three-position lock core limit plate, the three-position lock core limit plate is fixedly mounted on the outer surface of one end away from the limit frame, and a three-position lock core limit plate spring guide threaded column is fixedly mounted on the outer surface of one end close to the limit frame, the three-position lock core limit plate spring guide threaded column passes through the three-position lock core limit plate, the three-position lock core limit plate spring guide threaded column is sleeved with the three-position lock core limit plate spring, and a nut is mounted on the three-position lock core limit plate spring guide threaded column;

[0016] One end of the three-position lock core limit plate spring is in contact with the three-position lock core limit plate, and one end of the three-position lock core limit plate spring is in contact with the nut.

[0017] Preferably, the three-position lock core limit plate is in a "X" shape, the protruding portion of the three-position lock core limit plate blocks the through hole, and the free end of the three-position lock core limit plate abuts against the three-position lock disk.

[0018] Preferably, the three-station lock disk is provided with tooth grooves, and an upper pan head screw and a lower pan head screw are respectively fixedly installed on the three-station lock disk.

[0019] Preferably, the three-station lock control unit comprises a three-station knob limit plate 2 and a three-station knob limit plate 1, both of which are provided with a slide groove, and a positioning pin is fixedly installed on the third mounting plate, and the positioning pin is slidably matched with the slide groove;

[0020] A grounding and closing two-in-one hole is provided in the middle of the three-position knob limit plate 2 and the three-position knob limit plate 1;

[0021] A three-position knob is fixedly mounted on the lower end of the three-position knob limiting plate 1.

[0022] Preferably, the indicator disk limit block abuts against the second three-position knob limit plate.

[0023] Preferably, a grounding hole and a closing hole are respectively provided on the three-station panel.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are:

[0025] The present invention provides a three-station operating mechanism, which realizes the release and blocking of the three-station lock core by abutting the upper pan head screw and the lower pan head screw on the three-station lock disk with the three-station lock core limit plate, so as to facilitate the cooperation between the three-station lock core and the three-station lock disk, so that the three-station will be self-locking when in different states, and manual unlocking must be performed when the working state of the three-station is to be changed. The three-station can be unlocked only when the staff slides the three-station knob to the correct position, so that the staff's operation is more standardized, and further, the safety of the operating process is enhanced to avoid safety hazards caused by operating errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 A three-position operating mechanism of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 2 A three-position operating mechanism of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 3 A three-position operating mechanism of the present invention is shown in FIG. Figure 3 ;

[0030] Figure 4 A three-position operating mechanism of the present invention is shown in FIG. Figure 4 .

[0031] Description of the drawings: 1. Three-position panel; 2. Three-position lock operating panel; 3. Grounding hole; 4. Closing hole; 5. Three-position knob; 6. Connecting frame; 7. First mounting plate; 8. Second mounting plate; 9. Third mounting plate; 10. Indicator disk limit block; 11. Three-position knob limit plate 2; 12. Three-position knob limit plate 1; 13. Indicator disk rotating shaft; 14. Three-position lock core limit plate spring; 15. Three-position lock core limit plate; 16. Upper pan head screw; 17. Lower pan head screw; 18. Grounding shaft; 19. Three-position lock disk; 20. Closing shaft; 21. Indicator disk gear; 22. Three-position lock core; 23. Three-position lock core spring; 24. Grounding gear; 25. Closing gear; 26. Limit frame. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] like Figure 1-4 As shown, a three-station operating mechanism comprises a three-station panel 1, a connecting frame 6, a first mounting plate 7, a second mounting plate 8 and a third mounting plate 9, wherein the three-station panel 1, the connecting frame 6, the first mounting plate 7, the second mounting plate 8 and the third mounting plate 9 are sequentially connected by internal threaded columns, and a three-station gear unit is movably installed between the interlayer of the first mounting plate 7 and the second mounting plate 8;

[0034] A self-locking unit is installed between the second mounting plate 8 and the third mounting plate 9; the three-station gear unit abuts against the self-locking unit;

[0035] A three-station lock control unit is installed between the three-station panel 1 and the third mounting plate 9 .

[0036] Specifically, the three-position gear unit includes an indicator disc gear 21, a grounding gear 24 and a closing gear 25, wherein the indicator disc gear 21, the grounding gear 24 and the closing gear 25 are arranged in a herringbone shape, and the indicator disc gear 21, the grounding gear 24 and the closing gear 25 are meshed with each other, and a grounding shaft 18 is fixedly mounted on the grounding gear 24, and the free end of the grounding shaft 18 passes through the second mounting plate 8;

[0037] The closing gear 25 is fixedly mounted with a closing shaft 20;

[0038] The indicating disc gear 21 passes through the second mounting plate 8 and the third mounting plate 9 in sequence through the indicating disc rotating shaft 13 , and an indicating disc limiting block 10 is fixedly mounted on the indicating disc rotating shaft 13 .

[0039] Specifically, the self-locking unit includes a three-position lock operating plate 2, a three-position lock disk 19 and a limit frame 26, wherein the limit frame 26 is provided with a through hole on one side close to the three-position lock disk 19, a guide column is installed on the inner side wall of the limit frame 26, and a three-position lock core 22 is installed on the free end of the guide column, and a three-position lock core spring 23 is sleeved on the outer peripheral surface of the guide column, one end of the three-position lock core spring 23 abuts against the three-position lock core 22, and the other end of the three-position lock core spring 23 abuts against the inner side wall of the limit frame 26, so that the three-position lock core can slide along the guide column under the elastic force of the three-position lock core spring; and the three-position lock core 22 passes through the through hole and abuts against the three-position lock disk 19 to realize the locking operation of the three-position lock disk; the three-position lock disk 19 is fixedly installed on the grounding shaft 18;

[0040] One end of the three-position lock operating plate 2 is hinged to the three-position lock core 22, and the middle part of the three-position lock operating plate 2 is hinged to the limit frame 26 through a connecting ear. The three-position lock core is driven to move by turning the three-position lock operating plate, and further, the three-position lock core is disengaged from the three-position lock disk, thereby releasing the limit of the three-position lock core on the three-position lock disk.

[0041] Specifically, the self-locking unit further comprises a three-position lock core limit plate spring 14 and a three-position lock core limit plate 15. The three-position lock core limit plate 15 is fixedly mounted on the outer surface of one end away from the limit frame 26, and a three-position lock core limit plate spring guide threaded column is fixedly mounted on the outer surface of one end close to the limit frame 26. The three-position lock core limit plate spring guide threaded column penetrates the three-position lock core limit plate 15, and the three-position lock core limit plate spring guide threaded column is sleeved with the three-position lock core limit plate spring 14, and a nut is mounted on the three-position lock core limit plate spring guide threaded column;

[0042] One end of the three-position lock core limit plate spring 14 abuts against the three-position lock core limit plate 15, and one end of the three-position lock core limit plate spring 14 abuts against the nut, so that the three-position lock core limit plate spring presses the three-position lock core limit plate onto the limit frame to limit the three-position lock core.

[0043] Specifically, the three-position lock core limit plate 15 is in a "X" shape, the protruding portion of the three-position lock core limit plate 15 blocks the through hole, and the free end of the three-position lock core limit plate 15 abuts against the three-position lock disk 19 .

[0044] Specifically, the three-station lock disk 19 is provided with tooth grooves, and an upper pan head screw 16 and a lower pan head screw 17 are respectively fixedly installed on the three-station lock disk 19, and the upper pan head screw and the lower pan head screw are abutted against the three-station lock core limit plate, so that the three-station lock core limit plate can seal and disengage the through hole on the limit frame, which facilitates the abutment of the three-station lock core and the three-station lock disk to realize the locking operation.

[0045] Specifically, the three-station lock control unit includes a three-station knob limit plate 2 11 and a three-station knob limit plate 1 12, and the three-station knob limit plate 2 11 and the three-station knob limit plate 1 12 are both provided with a slide groove, and a positioning pin is fixedly installed on the third mounting plate 9, and the positioning pin is slidably matched with the slide groove;

[0046] The middle of the three-position knob limit plate 2 11 and the three-position knob limit plate 1 12 is provided with a grounding and closing two-in-one hole;

[0047] A three-position knob 5 is fixedly mounted on the lower end of the three-position knob limiting plate 12;

[0048] The indicator plate limit block 10 is in contact with the three-position knob limit plate 2 11. The three-position panel 1 is respectively provided with a grounding hole 3 and a closing hole 4. By adjusting the position of the three-position knob, the grounding and closing two-in-one hole is overlapped with the grounding hole or the closing hole to realize the change of the three-position working state, which is convenient for standardizing the working process of the operator and avoiding safety hazards caused by operating errors.

[0049] A method for using a three-station operating mechanism:

[0050] 1) Isolation → Closing

[0051] When the three-station position is in the isolation position, the limit block of the indicator disk is in an unrestricted state on both the left and right sides; at this time, the three-station knob limit plate 2 can slide to the left or to the right. After sliding to the left, the closing operation can be continued, and after sliding to the right, the grounding operation can be continued; at this time, the closing operation is performed, so the three-station knob is slid to the left, the three-station knob limit plate 1 and the three-station knob limit plate 2 are fixed together with the three-station knob, and slide to the left at the same time, and the operating holes on the three-station knob limit plate 1 and the three-station knob limit plate 2 are aligned with the closing axis;

[0052] At this time, the three-position lock is still in the locked state, and it needs to be unlocked if you want to continue the closing operation; pushing the three-position lock operating plate to the left will cause the three-position lock core to move to the right, compressing the three-position lock core spring. At the same time, due to the pressure of the three-position lock core limit plate spring, the three-position lock core limit plate is pressed down in the direction close to the three-position lock core, so that the three-position lock core is stuck on the right side of the three-position lock core limit plate, and the three-position lock disk will not be stuck. At this time, the three-position lock is in the unlocked state;

[0053] Use the operating handle to insert it into the closing hole and rotate it counterclockwise to perform the three-position closing operation. At this time, the closing gear also rotates counterclockwise, and the grounding gear meshing with it rotates clockwise. At the same time, the grounding shaft also rotates clockwise, and the three-position locking disk also rotates clockwise at the same time; when the three-position locking disk rotates clockwise to the closing position, the upper pan head screw of the three-position locking disk will lift the three-position lock core limit plate and slightly move away from the three-position lock core, so that its limiting function on the three-position lock core disappears, and the three-position lock core pops out. At this time, the upper notch of the three-position locking disk also rotates to the position aligned with the three-position lock core, and the three-position lock core pops out and is stuck in the upper notch of the three-position locking disk for locking; at this time, the three-position has reached the closing position, and the three-position lock has been re-locked, so that it is automatically locked according to the state, making the entire three-position mechanism safer;

[0054] When performing the closing operation, the closing gear rotates counterclockwise, and the indicator disc gear meshing with it rotates clockwise, driving the indicator disc rotating shaft to rotate clockwise. At the same time, the indicator disc limit block also rotates clockwise, which will make the right limit of the indicator disc limit block work, so that the three-position knob limit plate 2 cannot slide to the right; this is safer. When the three-position mechanism is in the closed state, the three-position knob limit plate 2 can only slide to the right by rotating the closing shaft to the isolation position again to continue the grounding operation, avoiding direct grounding in the closed position due to operational errors;

[0055] 2) Close → Isolate

[0056] When the three-station position is in the closing position, the indicator disk limit block is in the right limit state; at this time, the three-station knob limit plate 2 can only slide to the left, and the isolation operation can continue after sliding to the left; at this time, the isolation operation is performed, so the three-station knob is slid to the left, the three-station knob limit plate 1 and the three-station knob limit plate 2 are fixed together with the three-station knob, and slide to the left at the same time, and the operating holes on the three-station knob limit plate 1 and the three-station knob limit plate 2 are aligned with the closing axis;

[0057] At this time, the three-position lock is still in the locked state, and it needs to be unlocked if you want to continue the isolation operation; pushing the three-position lock operating plate to the left will cause the three-position lock core to move to the right, compressing the three-position lock core spring. At the same time, due to the pressure of the three-position lock core limit plate spring, the three-position lock core limit plate is pressed down in the direction close to the three-position lock core, so that the three-position lock core is stuck on the right side of the three-position lock core limit plate, and the three-position lock disk will not be stuck. At this time, the three-position lock is in the unlocked state;

[0058] Use the operating handle to insert it into the closing hole and rotate it clockwise to isolate the three-station operation. At this time, the closing gear also rotates clockwise, and the grounding gear meshing with it rotates counterclockwise. At the same time, the grounding shaft also rotates counterclockwise, and the three-station lock disk also rotates counterclockwise at the same time; when the three-station lock disk rotates counterclockwise to the isolation position, the upper pan head screw of the three-station lock disk will lift the three-station lock core limit plate and slightly move it away from the three-station lock core, so that its limiting function on the three-station lock core disappears, and the three-station lock core pops out. At this time, the middle notch of the three-station lock disk also rotates to the position aligned with the three-station lock core, and the three-station lock core pops out and is stuck in the middle notch of the three-station lock disk for locking; at this time, the three-station has reached the isolation position, and the three-station lock has been re-locked, so that it is automatically locked according to the state, making the entire three-station mechanism safer;

[0059] When performing the isolation operation, the closing gear rotates clockwise, and the indicator disc gear meshing with it rotates counterclockwise, driving the indicator disc rotating shaft to rotate counterclockwise. At the same time, the indicator disc limit block also rotates counterclockwise, which will make the left and right side limits of the indicator disc limit block ineffective, allowing the three-position knob limit plate 2 to slide to the left or to the right, thus returning to the initial isolation state;

[0060] 3) Isolation → Grounding

[0061] When the three-station position is in the isolation position, the limit block of the indicator disk is in an unrestricted state on both the left and right sides; at this time, the three-station knob limit plate 2 can slide to the left or to the right. After sliding to the left, the closing operation can be continued, and after sliding to the right, the grounding operation can be continued; at this time, the grounding operation is performed, so the three-station knob is slid to the right, the three-station knob limit plate 1 and the three-station knob limit plate 2 are fixed together with the three-station knob, and slide to the right at the same time, and the operating holes on the three-station knob limit plate 1 and the three-station knob limit plate 2 are aligned with the grounding axis;

[0062] At this time, the three-position lock is still in the locked state, and it needs to be unlocked if you want to continue the grounding operation; pushing the three-position lock operating plate to the left will cause the three-position lock core to move to the right, compressing the three-position lock core spring. At the same time, due to the pressure of the three-position lock core limit plate spring, the three-position lock core limit plate is pressed down in the direction close to the three-position lock core, so that the three-position lock core is stuck on the right side of the three-position lock core limit plate, and the three-position lock disk will not be stuck. At this time, the three-position lock is in the unlocked state;

[0063] Use the operating handle to insert it into the grounding hole and rotate it counterclockwise to perform the grounding operation on the three-station. At this time, the grounding gear also rotates counterclockwise, and the grounding shaft also rotates counterclockwise, and the three-station lock disk also rotates counterclockwise at the same time; when the three-station lock disk rotates counterclockwise to the grounding position, the lower pan head screw of the three-station lock disk will lift the three-station lock core limit plate and slightly move away from the three-station lock core, so that its limit function on the three-station lock core disappears, and the three-station lock core pops out. At this time, the lower notch of the three-station lock disk also rotates to the position aligned with the three-station lock core, and the three-station lock core pops out and is stuck in the lower notch of the three-station lock disk for locking; at this time, the three-station has reached the grounding position, and the three-station lock has also been re-locked, so that automatic locking according to the state makes the entire three-station mechanism safer;

[0064] When performing the grounding operation, the grounding gear rotates counterclockwise, and the closing gear meshing with it rotates clockwise. At the same time, the indicator disc gear meshing with the closing gear rotates counterclockwise, driving the indicator disc rotating shaft to rotate counterclockwise. At the same time, the indicator disc limit block also rotates counterclockwise, which will make the left limit of the indicator disc limit block work, so that the three-position knob limit plate 2 cannot slide to the left; this is safer. When the three-position mechanism is in the grounded state, the three-position knob limit plate 2 can only slide to the left by rotating the grounding shaft to the isolation position again to continue the closing operation, avoiding direct closing in the grounding position due to operating errors;

[0065] 4) Grounding → Isolation

[0066] When the third station is in the grounding position, the indicator disk limit block is in the left limit state; at this time, the third station knob limit plate 2 can only slide to the right, and the isolation operation can continue after sliding to the right; at this time, the isolation operation is performed, so the third station knob is slid to the right, the third station knob limit plate 1 and the third station knob limit plate 2 are fixed together with the third station knob, and slide to the right at the same time, and the operating holes on the third station knob limit plate 1 and the third station knob limit plate 2 are aligned with the grounding axis;

[0067] At this time, the three-position lock is still in the locked state, and it needs to be unlocked if you want to continue the isolation operation; pushing the three-position lock operating plate to the left will cause the three-position lock core to move to the right, compressing the three-position lock core spring. At the same time, due to the pressure of the three-position lock core limit plate spring, the three-position lock core limit plate is pressed down in the direction close to the three-position lock core, so that the three-position lock core is stuck on the right side of the three-position lock core limit plate, and the three-position lock disk will not be stuck. At this time, the three-position lock is in the unlocked state;

[0068] Use the operating handle to insert it into the grounding hole and rotate it clockwise to isolate the three-station operation. At this time, the grounding gear also rotates clockwise, and the grounding shaft also rotates clockwise, and the three-station lock disk also rotates clockwise at the same time; when the three-station lock disk rotates clockwise to the isolation position, the lower pan head screw of the three-station lock disk will lift the three-station lock core limit plate and slightly move away from the three-station lock core, so that its limit function on the three-station lock core disappears, and the three-station lock core pops out. At this time, the middle notch of the three-station lock disk also rotates to the position aligned with the three-station lock core, and the three-station lock core pops out and is stuck in the middle notch of the three-station lock disk for locking; at this time, the three-station has reached the isolation position, and the three-station lock has been re-locked, so that it is automatically locked according to the state, making the entire three-station mechanism safer;

[0069] When performing the isolation operation, the grounding gear rotates clockwise, the closing gear meshing with it rotates counterclockwise, and the indicator disc gear meshing with the closing gear rotates clockwise, driving the indicator disc rotating shaft to rotate clockwise. At the same time, the indicator disc limit block also rotates clockwise, which will make the left and right side limits of the indicator disc limit block ineffective, allowing the three-position knob limit plate two to slide to the left or to the right, thus returning to the original isolation state.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or seal including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or seal.

[0071] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A three-station operating mechanism, comprising a three-station panel (1), a connecting frame (6), a first mounting plate (7), a second mounting plate (8) and a third mounting plate (9), wherein the three-station panel (1), the connecting frame (6), the first mounting plate (7), the second mounting plate (8) and the third mounting plate (9) are sequentially connected by internal threaded columns, characterized in that: A three-station gear unit is movably installed between the interlayer of the first mounting plate (7) and the second mounting plate (8); A self-locking unit is installed between the second mounting plate (8) and the third mounting plate (9); the three-station gear unit is in contact with the self-locking unit; A three-station lock control unit is installed between the interlayer of the three-station panel (1) and the third mounting plate (9).

2. A three-station operating mechanism according to claim 1, characterized in that: The three-position gear unit comprises an indicator disc gear (21), a grounding gear (24) and a closing gear (25); the indicator disc gear (21), the grounding gear (24) and the closing gear (25) are arranged in a herringbone shape, and the indicator disc gear (21), the grounding gear (24) and the closing gear (25) are meshed with each other; a grounding shaft (18) is fixedly mounted on the grounding gear (24), and a free end of the grounding shaft (18) passes through the second mounting plate (8); A closing shaft (20) is fixedly mounted on the closing gear (25); The indicating disc gear (21) passes through the second mounting plate (8) and the third mounting plate (9) in sequence via an indicating disc rotating shaft (13), and an indicating disc limiting block (10) is fixedly mounted on the indicating disc rotating shaft (13).

3. A three-station operating mechanism according to claim 2, characterized in that: The self-locking unit comprises a three-position lock operating plate (2), a three-position lock disk (19) and a limiting frame (26); a through hole is provided on a side of the limiting frame (26) close to the three-position lock disk (19); a guide column is installed on the inner side wall of the limiting frame (26); a three-position lock core (22) is installed on the free end of the guide column; a three-position lock core spring (23) is sleeved on the outer peripheral surface of the guide column; one end of the three-position lock core spring (23) abuts against the three-position lock core (22), and the other end of the three-position lock core spring (23) abuts against the inner side wall of the limiting frame (26); and the three-position lock core (22) passes through the through hole and abuts against the three-position lock disk (19); the three-position lock disk (19) is fixedly installed on the grounding shaft (18); One end of the three-position lock operating plate (2) is hinged to the three-position lock core (22), and the middle part of the three-position lock operating plate (2) is hinged to the limit frame (26) via a connecting ear.

4. A three-station operating mechanism according to claim 3, characterized in that: The self-locking unit further comprises a three-position lock core limit plate spring (14) and a three-position lock core limit plate (15); the three-position lock core limit plate (15) is fixedly mounted on the outer surface of one end away from the limit frame (26); a three-position lock core limit plate spring guide thread column is fixedly mounted on the outer surface of one end close to the limit frame (26); the three-position lock core limit plate spring guide thread column passes through the three-position lock core limit plate (15); the three-position lock core limit plate spring guide thread column is sleeved with the three-position lock core limit plate spring (14); a nut is mounted on the three-position lock core limit plate spring guide thread column; One end of the three-position lock core limit plate spring (14) abuts against the three-position lock core limit plate (15), and one end of the three-position lock core limit plate spring (14) abuts against the nut.

5. A three-station operating mechanism according to claim 4, characterized in that: The three-position lock core limit plate (15) is in a "+" shape, the protruding portion of the three-position lock core limit plate (15) blocks the through hole, and the free end of the three-position lock core limit plate (15) abuts against the three-position lock disk (19).

6. A three-station operating mechanism according to claim 5, characterized in that: The three-station lock disk (19) is provided with tooth grooves, and an upper pan head screw (16) and a lower pan head screw (17) are respectively fixedly mounted on the three-station lock disk (19).

7. A three-station operating mechanism according to claim 6, characterized in that: The three-station lock control unit comprises a three-station knob limit plate 2 (11) and a three-station knob limit plate 1 (12), wherein the three-station knob limit plate 2 (11) and the three-station knob limit plate 1 (12) are both provided with a slide groove, and a positioning pin is fixedly installed on the third mounting plate (9), and the positioning pin is slidably matched with the slide groove; A two-in-one grounding and closing hole is provided in the middle of the three-position knob limit plate 2 (11) and the three-position knob limit plate 1 (12); A three-position knob (5) is fixedly mounted on the lower end of the three-position knob limiting plate (12).

8. A three-station operating mechanism according to claim 7, characterized in that: The indicating disk limit block (10) is in contact with the second three-position knob limit plate (11).

9. A three-station operating mechanism according to claim 1, characterized in that: The three-station panel (1) is respectively provided with a grounding hole (3) and a closing hole (4).

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