Low-voltage fixed circuit breaker hand operating mechanism

Abstract

The application relates to a hand operating mechanism for a low-voltage fixed circuit breaker, which comprises a mechanism support, a planar double-link positioning mechanism, a switching-on and switching-off sliding plate and a shaft sleeve crank arm mechanism. The switching-on and switching-off sliding plate performs switching-on and switching-off translation movement under the positioning constraint of the planar double-link positioning mechanism. The traction crank arm of the shaft sleeve crank arm mechanism is driven and matched with the switching-on and switching-off sliding plate, and is used for driving the switching-on and switching-off sliding plate to perform translation movement through the swing action of the traction crank arm, operating the plunger of the circuit breaker, having a limiting shaft on the connecting rod, having a mechanism sliding groove on the mechanism support, and embedding the limiting shaft into the mechanism sliding groove. The beneficial effect of the application is that the structure principle of the double-link positioning mechanism is used to constrain the switching-on and switching-off sliding plate to switch on and off the circuit breaker, the 100% reliability of the fault under-voltage tripping and the handle tripping indication of various types of circuit breakers is realized, the switching-on and switching-off operation force is small, the switching-on and switching-off angle is correct, the position of the shaft sleeve on the mechanism support can be flexibly set, the connection distance H of the circuit breaker arranged in the unit is reduced by 25-30 mm.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage complete equipment, in particular to a manual operating mechanism of a low-voltage fixed circuit breaker. Background Art

[0002] In addition to being used for opening and closing the fixed circuit breaker, the manual operating mechanism of a low-voltage fixed circuit breaker must also meet the requirements for correctly indicating the closing operation, undervoltage tripping, and handle tripping status when the user applies the circuit breaker. However, the undervoltage tripping force of circuit breakers of various models and currents varies. In particular, the undervoltage tripping force of circuit breakers between 16A and 250A is too small, which places extremely high demands on the positioning of the manual operating mechanism.

[0003] In the current industry, the domestically produced manual operating mechanisms used in the industry generally fail to indicate the handle status of the unit panel when in the tripped state in about 20-30% of cases. Even for low-current circuit breakers, the handle indication of the unit panel is only in place in 50% of cases. The manual operating mechanism relies on the rotational arc motion of the shaft sleeve to convert it into the linear motion of the opening and closing sliding plate, driving the dial head to perform left and right opening and closing movements. The opening and closing sliding plate and the mechanism bracket have no motion positioning, only position limits. This causes the structural position limit defects to be unbalanced when the rotational arc motion of the shaft sleeve is converted into the linear motion of the opening and closing sliding plate, resulting in squeezing pressure, medium mechanical resistance, large opening and closing force, and undervoltage tripping. The opening and closing slide plate does not move properly. This is the main defect of the manual operating mechanism.

[0004] The structure of the existing manual operating mechanism is as follows: the shaft sleeve is positioned on the mechanism bracket, and the upper and lower ends of the mechanism bracket add limit limits to the opening and closing sliding plate, but the opening and closing sliding plate and the bracket are not positioned for movement. As a result, the opening and closing sliding plate and the limiter are squeezed and blocked, and the manual operating force is also large when opening and closing. If the circuit breaker trips due to a fault, since the impact force of the low-current circuit breaker body is small, the normal tolerance eccentricity between the manual operating mechanism, the opening and closing shaft rod, and the unit door also has resistance, which will cause the circuit breaker tripping action to be blocked and not in place. That is, the rotation angle of the manual operating mechanism is not in place, and the probability that the tripping indication of the panel handle will not reach the correct indication is very high, especially for 63A, 100A, and 250A circuit breakers.

[0005] In addition, the center eccentricity of the opening and closing shaft sleeves of the manual operating mechanisms of circuit breakers currently used in the market is too large or too small, and they are inconsistent. Therefore, the fixed position of the circuit breaker in the unit is uncertain and highly variable, resulting in the fixed position of the circuit breaker in the unit and the front and back of the outgoing line B mutual inductor being unable to be staggered. Figure 16 , the connection distance H can only be increased and the circuit breaker can be fixed, but the connection distance cannot be reduced and the unit depth cannot be shallowed. The amount of copper used in the unit main circuit connectors increases, the workload in the design increases, the degree of standardization is low, and the structural cost increases.

[0006] When various manual operating mechanisms and handles are installed in conjunction with the unit and door, the trip and closing shafts have different lengths of 60mm, 150mm, and 200mm. The manufacturer's tolerance for the fixed position of the circuit breaker and the matching tolerance between the shaft and the handle center of the unit door panel are normally ±2.0mm, which means that the minimum clearance between the shaft and the shaft sleeve fitting hole of the mechanism bracket must be 0.5mm. Due to the large clearance between the shaft sleeve and the mechanism bracket, when the shaft sleeve rotates, because the trip and closing sliding plate and the mechanism bracket are not positioned for movement, the trip and closing sliding plate cannot control the rotation arc of the shaft sleeve within the effective range, resulting in point friction between the shaft sleeve and the shaft sleeve fitting hole of the mechanism bracket. In addition, the trip and closing sliding plate causes unbalanced movement and point friction with the limiter on the mechanism bracket, which is the reason for the excessive operating force. If the circuit breaker tripping action is blocked, the manual operating mechanism will cause small movement, and the handle will not be able to rotate to the effective angle for the trip indication.

[0007] The unit panel handle trip indication, the national power department agency proposed that the manual operation mechanism used in the industry requires domestic technology to solve this application function defect, and high-end user equipment also put forward requirements for this function. Summary of the Invention

[0008] The technical problem to be solved by the present invention is that the existing manual operating mechanism of the circuit breaker has large operating resistance and is prone to jamming. When the circuit breaker trips due to undervoltage, the mechanism does not operate and the trip indication is incorrect.

[0009] Further solution: The existing manual operating mechanism structure has a large eccentricity in the position of the shaft sleeve on the mechanism bracket and cannot be flexibly changed. Therefore, the fixed position of the 630A and 400A circuit breakers in the unit is required to be variable. As a result, the fixed position of the circuit breaker and the B mutual inductor cannot be staggered in front and behind. The circuit breaker connection distance H can only be lengthened, and the unit depth cannot be reduced. In addition, the connector consumes a lot of copper.

[0010] The technical solution adopted by the present invention to solve its technical problems is: a manual operating mechanism for a low-voltage fixed circuit breaker, including a mechanism bracket, a planar double-link positioning mechanism, a switching sliding plate and a sleeve crank arm mechanism, the switching sliding plate is used to cooperate with the switching head of the circuit breaker and operate the switching head of the circuit breaker through translational motion, the planar double-link positioning mechanism includes two connecting rods, the two connecting rods are respectively connected to the mechanism bracket and the switching sliding plate, forming a parallel four-link mechanism, the switching sliding plate performs switching translational motion under the positioning constraints of the two connecting rods, the sleeve crank arm mechanism is rotatably mounted on the mechanism bracket, the sleeve crank arm mechanism includes a sleeve and a traction crank arm, the sleeve is used to cooperate with the rear shaft head of the switching shaft rod, transmit the rotation operation of the switching shaft rod to the traction crank arm, drive the traction crank arm to swing, the traction crank arm is driven and cooperated with the switching sliding plate, and is used to drive the switching sliding plate to perform translational motion through the swinging action of the traction crank arm to operate the switching head of the circuit breaker.

[0011] In order to effectively position and constrain the travel of the opening and closing sliding plate, preferably, a limiting shaft is provided on the connecting rod, a mechanism sliding groove is provided on the mechanism bracket, and the limiting shaft is embedded in the mechanism sliding groove.

[0012] Preferably, the matching structure for driving the traction crank arm and the opening and closing sliding plate is specifically a traction shaft and a traction chute located on the traction crank arm and the opening and closing sliding plate respectively, and the traction shaft is embedded in the traction chute.

[0013] Preferably, the opening and closing sliding plate operates the dial head through the dial head operating structure, which is specifically a dial head operating hole on the opening and closing sliding plate. The dial head operating hole is used to operate the dial head embedded in the dial head operating hole through the side of the dial head operating hole.

[0014] More preferably, the side of the shift head operating hole is provided with an anti-friction lining, and the shift head is operated by the anti-friction lining.

[0015] Preferably, the manual operating mechanism of the low-voltage fixed circuit breaker also includes a circuit breaker fault undervoltage tripping assist mechanism, which interacts with the opening and closing sliding plate during closing and tripping, and is used to elastically store energy during closing, release the stored energy to assist the opening and closing sliding plate during tripping, and disengage from the opening and closing sliding plate during opening.

[0016] More preferably, the circuit breaker fault undervoltage tripping assist mechanism is installed on the mechanism bracket, and the circuit breaker fault undervoltage tripping assist mechanism is specifically a torsion spring mechanism, and the opening and closing sliding plate has a torsion spring force axis, and the torsion spring mechanism interacts with the torsion spring force axis through the torsion arm of the torsion spring for energy storage and assisting.

[0017] Preferably, the connecting rod is hingedly connected to the mechanism bracket and the opening and closing sliding plate respectively through a connecting rod shaft.

[0018] In order to better position and constrain the translational movement of the opening and closing sliding plate, preferably, the limiting shaft is provided with an axial limiting structure for controlling the axial clearance between the connecting rod and the mechanism bracket.

[0019] In order to better position and constrain the translational movement of the opening and closing sliding plate, preferably, the traction shaft is provided with an axial limiting structure for controlling the axial gap between the traction crank arm and the opening and closing sliding plate.

[0020] The beneficial effects of the present invention are: through the structural principle of the double-link positioning and restraining opening and closing sliding plate opening and closing circuit breaker, the undervoltage tripping and handle tripping indication of various types of circuit breakers are 100% reliable, the opening and closing operating force is small, and the opening and closing angles are correct.

[0021] The position of the sleeve on the mechanism bracket can be flexibly set and can be matched with various types of circuit breakers and units. At the same time, by effectively determining the eccentricity value of the sleeve, the fixed position range of the circuit breaker in the unit can be effectively determined, which reduces the circuit breaker connection distance H when the circuit breaker is arranged in the unit by 25~30mm.

[0022] In addition, the cost of applying this manual-operated mechanism structure is low, and the purchase price is basically the same as that of domestic manual-operated mechanisms, and 4 to 6 times lower than that of foreign brand manual-operated mechanisms. The feasibility of market application has broad prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples;

[0024] Figure 1 This is a front structural schematic diagram of the planar double-link positioning mechanism of the hand-operated mechanism of the present invention on the mechanism bracket;

[0025] Figure 2 This is a schematic diagram of the back structure of the planar double-link positioning mechanism of the hand-operated mechanism of the present invention on the mechanism bracket;

[0026] Figure 3 It is a schematic structural diagram of the back side of the opening and closing sliding plate of the manual operating mechanism of the present invention;

[0027] Figure 4 2 is a schematic diagram of the back structure of the hand-operated mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the assembly structure of the centrally-installed manual operating mechanism for various current circuit breakers of the present invention;

[0029] Figure 6 It is a schematic diagram of the assembly structure of the eccentrically arranged hand-operated mechanism for a low-current circuit breaker of the present invention;

[0030] Figure 7 It is a schematic diagram of the assembly structure of the eccentrically arranged hand-operated mechanism for a high-current circuit breaker of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the manual operating mechanism of the present invention in the closing position;

[0032] Figure 9 It is a structural schematic diagram of the hand-operated mechanism of the present invention in the tripping position;

[0033] Figure 10 It is a structural schematic diagram of the hand-operated mechanism of the present invention in the open position;

[0034] Figure 11 It is a structural schematic diagram of the hand-operated mechanism of the present invention in the re-fastening position;

[0035] Figure 12 This is a state diagram of the unit panel handle of the manual operating mechanism of the present invention when opening the switch;

[0036] Figure 13 This is a state diagram of the unit panel handle of the manual operating mechanism of the present invention when closing the circuit breaker;

[0037] Figure 14 This is a state diagram of the unit panel handle of the manual operating mechanism of the present invention when the circuit breaker is tripped;

[0038] Figure 15 Schematic diagram of the structure of a 630A drawer unit using the hand-operated mechanism of the present invention;

[0039] Figure 16 This is a structural diagram of a 630A drawer unit using an existing conventional manual operating mechanism;

[0040] In the figure, 1. Mechanism bracket, 1-1. Mechanism slide, 1-2. Circuit breaker fixing hole, 1-3. Torsion spring base fixing hole, 1-4. Dial head action clearance hole, 2. Bushing, 2-1. Shaft hole, 3. Shaft rod fixing screw, 4. Connecting rod, 5. Limiting shaft, 6. Connecting rod shaft, 7. Connecting rod fixing hole, 8. Traction crank arm, 8-1. Traction shaft mounting hole, 9. Crank arm fixing screw, 10. Opening and closing sliding plate, 10-1. Traction slide, 11. Anti-friction lining, 12. Torsion spring force shaft, 13. Traction shaft, 14. Torsion spring base, 15. Torsion spring, 16. Circuit breaker, 16-1. Dial head, 17. Handle, 18. Opening and closing shaft, 19. B mutual sensor. DETAILED DESCRIPTION

[0041] like Figures 1 to 15 As shown, a manual operating mechanism for a low-voltage fixed circuit breaker includes a mechanism bracket 1, a planar double-link positioning mechanism, an opening and closing sliding plate 10, a shaft sleeve crank arm mechanism and a circuit breaker fault undervoltage tripping assist mechanism.

[0042] The planar double-link positioning mechanism is used to position and constrain the opening and closing sliding plate 10. The opening and closing sliding plate 10 is used to cooperate with the switch head 16-1 of the circuit breaker 16. The switch head 16-1 of the circuit breaker 16 is operated by the translational movement of the opening and closing sliding plate 10. The planar double-link positioning mechanism includes two connecting rods 4. Both connecting rods 4 are connected to the mechanism bracket 1 and the opening and closing sliding plate 10 through the connecting rod shaft 6, forming a parallel four-link mechanism. Figure 4 As shown, L1 = L3, L2 = L4 of the parallel four-bar linkage, and the opening and closing sliding plate 10 performs opening and closing translational motion under the positioning constraints of the two connecting rods 4.

[0043] The connecting rod 4 is provided with a limiting shaft 5, the mechanism bracket 1 is provided with a mechanism sliding groove 1-1, and the limiting shaft 5 is embedded in the mechanism sliding groove 1-1.

[0044] The sleeve-crank mechanism is mounted on the mechanism bracket 1 and includes a sleeve 2 and a traction crank 8. The sleeve 2 is used to cooperate with the rear shaft head of the opening and closing shaft rod 18, transmitting the rotation of the opening and closing shaft rod 18 to the traction crank 8, driving the traction crank 8 to swing. The traction crank 8 cooperates with the opening and closing sliding plate 10. The swinging action of the traction crank 8 drives the opening and closing sliding plate 10 to perform translational motion, operating the dial head 16-1 of the circuit breaker 16 to open and close the circuit breaker.

[0045] The shaft sleeve 2 has a shaft hole 2-1 for inserting the rear end of the tripping / closing shaft rod 18. The shaft sleeve 2 passes through the mechanism bracket 1 and is fixed to the traction crank arm 8. The driving mechanism of the traction crank arm 8 and the tripping / closing sliding plate 10 specifically comprises a traction shaft 13 and a traction chute 10-1 located on the traction crank arm 8 and the tripping / closing sliding plate 10, respectively. The traction shaft 13 is embedded in the traction chute 10-1 and is fixed to the traction crank arm 8 through the traction shaft mounting hole 8-1 on the traction crank arm 8.

[0046] The opening and closing sliding plate 10 operates the dial head 16-1 via a dial head operating structure. The dial head operating structure is specifically a dial head operating hole on the opening and closing sliding plate 10. The dial head operating hole is used to operate the dial head 16-1 inserted into the dial head operating hole through the side of the dial head operating hole. The side of the dial head operating hole is provided with an anti-friction lining 11, which is used to operate the dial head 16-1 to open and close the switch.

[0047] In addition to the double-link positioning and restraining of the opening and closing sliding plate 10 for translational movement to open and close the circuit breaker 16, the manual operating mechanism is also provided with a circuit breaker fault undervoltage tripping assist mechanism.

[0048] The circuit breaker fault undervoltage tripping assist mechanism interacts with the opening and closing sliding plate 10 during closing and tripping, and is used to elastically store energy during closing, and release the stored energy to assist the opening and closing sliding plate 10 when the circuit breaker 16 trips, so that the opening and closing sliding plate 10 effectively moves to the tripping position, and the handle 17 on the unit panel indicates 100% of the tripping status. The circuit breaker fault undervoltage tripping assist mechanism disengages from the opening and closing sliding plate 10 during opening. The circuit breaker fault undervoltage tripping assist mechanism is mounted on the mechanism bracket 1. The circuit breaker fault undervoltage tripping assist mechanism is specifically a torsion spring mechanism. The opening and closing sliding plate 10 has a torsion spring force shaft 12. The torsion spring mechanism interacts with the torsion spring force shaft 12 through the torsion arm of the torsion spring 15, and is used to store energy and provide assistance.

[0049] The circuit breaker fault undervoltage trip assist mechanism ensures that even when the tripping force of circuit breaker 16 is low, the dial head 16-1 and the opening and closing sliding plate 10 can move into position, thereby driving the handle 17 on the unit panel to correctly indicate the status. When circuit breaker 16 is opened, the torsion spring 15 disengages from the torsion spring force shaft 12, preventing the torsion spring 15 from affecting the opening position and the correct angle of the opening and closing shaft rod 18. This ensures that the angle of the handle 17 does not change after the circuit breaker is opened, and the handle 17 correctly cooperates with the front shaft head of the opening and closing shaft rod 18, making the unit door easy and fast to close.

[0050] The manual operating mechanism of the low-voltage fixed circuit breaker of this embodiment is more specifically structured as follows:

[0051] The mechanism bracket 1 has four circuit breaker fixing holes 1 - 2 , which are respectively located at the four corners of the mechanism bracket 1 . The manual operating mechanism is fixed to the circuit breaker 16 through the four circuit breaker fixing holes 1 - 2 and corresponding circuit breaker fixing screws.

[0052] The opening and closing sliding plate 10 is located on the back of the mechanism bracket 1. When the dial head 16-1 of the circuit breaker 16 protrudes from the mechanism bracket 1, the corresponding mechanism bracket 1 has a dial head action clearance hole 1-4 for making way for the dial head 16-1.

[0053] Connecting rod 4 has a connecting rod fixing hole 7 and a stopper shaft fixing hole. Mechanism bracket 1 has a connecting rod transition hole. Connecting rod shaft 6 passes through the connecting rod transition hole and is fixed in connecting rod fixing hole 7. Stopper shaft 5 passes through mechanism guide slot 1-1 and is fixed in the stopper shaft fixing hole. There is clearance between connecting rod shaft 6 and the connecting rod transition hole, and between stopper shaft 5 and mechanism guide slot 1-1, to ensure smooth sliding. The clearance is actually controlled to 0.2mm.

[0054] The connecting rod shaft 6, the limiting shaft 5 and the traction shaft 13 all adopt stud shafts, the head end of the stud shaft has a protruding shaft cap head, and the axis is limited by the shaft cap head of the stud shaft.

[0055] After the opening and closing shaft rod 18 is inserted into the shaft hole 2 - 1 of the shaft sleeve 2 , it is tightened and fixed by the shaft rod fixing screw 3 on the side of the shaft sleeve 2 .

[0056] The mechanism bracket 1 has torsion spring base fixing holes 1-3, and the torsion spring 15 of the circuit breaker fault undervoltage trip assist mechanism is installed on the mechanism bracket 1 through the torsion spring base 14. The torsion spring base 14 is fixed by two torsion spring base fixing screws screwed into the torsion spring base fixing holes 1-3.

[0057] The shaft sleeve 2 is rotatably mounted on the mechanism bracket 1 , and the rear end of the shaft sleeve 2 passing through the mechanism bracket 1 is fixed to the traction crank arm 8 by two crank arm fixing screws 9 .

[0058] The manual operating mechanism of the present invention pulls the opening and closing sliding plate 10 through the shaft sleeve 2, the pulling arm 8, the pulling shaft 13 and the pulling chute 10-1. During the process of the shaft sleeve 2 rotating 90 degrees, the opening and closing sliding plate 10 is pulled to move horizontally, achieving no mechanical blocking resistance, achieving the correct opening and closing angles, and the positioning angle of the opening and closing sliding plate 10 meets the application technical requirements. The specific process of opening and closing operation is as follows:

[0059] like Figure 10 and 12 As shown, when the circuit breaker 16 is in the open state, the handle 17 on the unit panel of the unit door indicates the open state, and the angle of the handle 17 is consistent with the angle of the pin on the front shaft head of the opening and closing shaft rod 18.

[0060] like Figure 8 and 13 As shown, close the unit door, rotate the handle 17 90° to the right, close the circuit breaker 16, and the handle 17 correctly indicates the closing symbol.

[0061] like Figure 9 and 14 As shown, when the circuit breaker 16 trips due to a fault, the torsion spring 15 acts on the torsion spring force-bearing shaft 12 to release the stored energy, thereby assisting the circuit breaker 16 in tripping due to the fault, and the handle 17 rotates and correctly indicates the trip symbol.

[0062] like Figure 11 As shown, when opening and re-opening operations are performed, the torsion spring 15 is disengaged from the torsion spring force axis 12, the handle 17 is turned left to the limit, the circuit breaker 16 is released from the tripping, and then rotated rightward to close the circuit breaker.

[0063] The position of the sleeve 2 on the mechanism bracket 1 can be flexibly set and can be matched with various types of circuit breakers 16 and units. At the same time, by effectively determining the eccentricity value of the sleeve 2, the fixed position range of the circuit breaker 16 in the unit can be effectively determined, which reduces the circuit breaker connection distance H by 25 to 30 mm.

[0064] The details are as follows:

[0065] In the attached Figure 15 In the 630A and 400A circuit breakers 16, the shaft sleeve 2 of the manual operating mechanism is set 31.5mm to the left of the center of the dial head 16-1 in the horizontal direction. Compared with the manual operating mechanism currently used in China, the center offset value is 25mm to 68mm smaller. This allows various types of circuit breakers 16 and the B mutual inductor 19 to be set front and back in the unit, shortening the connection distance H by 25mm to 30mm. Each connecting piece, that is, the connecting copper bar, can save 25mm of copper, achieving the industry's top miniaturized structural application technology with a circuit breaker connection distance H of 80mm. Figure 15 and Figure 16 In contrast, Figure 15In the case of a 300mm unit depth, Figure 16 The depth of the middle unit is 350mm. Figure 15 and Figure 16 In the cabinet, the frame module is 20~25mm.

[0066] At the same time, the shaft sleeve 2 is set 40 mm downward from the center of the dial head 16-1 of the circuit breaker 16, so that the circuit breaker 16 can be installed 20 mm lower to the bottom in the unit, and the height of the 630A unit is 300 mm.

[0067] The manual operating mechanism of the present invention can adapt to the design and development of various types of circuit breakers 16 with different current levels by positioning the opening and closing sliding plate 10 with double connecting rods, such as Figure 5 、 6 As shown in FIG7 , the position of the sleeve 2 can also be flexibly changed. The center of the sleeve 2 can be eccentric or centrally set. It is only necessary to change the length of the traction crank arm 8 and the opening and closing traction angle.

[0068] When the unit is used for currents below 250A, the center setting of the shaft sleeve 2 is the main setting. When the 1 / 2 unit is used for currents of 100A and 63A, both the center and off-center settings are adopted. However, when the unit is used for currents of 400A and 630A, the center setting manual mechanism can also be used, and the height of the mechanism bracket 1 needs to be slightly increased.

[0069] In summary, the technical application performance and economic value of the present invention are:

[0070] The structural principle of the double-link positioning and restraining opening and closing sliding plate 10 for opening and closing the circuit breaker 16 of the present invention is the main innovation of the present invention, specifically: through the multi-point positioning of the planar double-link positioning mechanism and the connecting rod shaft 6, the opening and closing sliding plate 10 is effectively positioned and restrained to perform translational movement relative to the mechanism bracket 1, and the limiting shaft 5 on the connecting rod 4 is embedded and matched with the mechanism slide groove 1-1 on the mechanism bracket 1, so as to effectively position and restrain the movement requirements of the opening and closing sliding plate 10.

[0071] Such major innovations achieve 100% reliable tripping for all current levels of 630A, 400A, 250A, 100A, 63A, 32A and below. The opening and closing operating force is 30% less than that of the manual operating mechanism of domestic and foreign brands. The opening and closing angles are 100% correct. The handle 17 and the front shaft head of the opening and closing shaft rod 18 are correctly matched, which facilitates the closing of the unit door and ensures the consistent appearance requirements of the handle 17 in the 90° closing position. Even for small current circuit breakers 16, it can ensure that the handle 17 indicates correctly when tripping, which is convenient for maintenance personnel to quickly identify and close the circuit breaker in time.

[0072] The 630A and 400A hand operating mechanisms of the application are arranged with the center of the knob 16-1 of the circuit breaker 16 being 31.5 mm to the left of the center, and the height of the support is lowered, so that the connection distance H of the 630A circuit breaker unit is shortened by 25 mm, the 6 copper connecting bars are shortened by 150 mm, the copper amount is saved by 315 g for the 630A and 236 g for the 400A, and the unit depth is reduced by 25 mm.

[0073] The fixed position of the 630A circuit breaker 16 using the hand operating mechanism in the market cannot be determined, and the connection distance H needs to be lengthened by 25 mm compared with the unit using the hand operating mechanism of the application, and the unit depth is Figure 16 .

[0074] The procurement price of the hand operating mechanism of the application is basically the same as that of the domestic hand operating mechanism, the connection distance of the 630A and 400A circuit breakers is shortened by 25 mm, the copper amount is saved, and the unit depth is reduced, the procurement price of the hand operating mechanism of the application is 4-6 times lower than that of the foreign brand hand operating mechanism, and the market application is feasible and has a wide prospect.

[0075] The above is only the preferred embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

[0076] For example, the two connecting rods 4 are connected to the mechanism support 1 and the opening and closing sliding plate 10 through other conventional shaft assembly structures in the mechanical field instead of the connecting rod shaft in the form of the stud shaft.

[0077] For another example, the stud shafts as the connecting rod shaft, the limiting shaft and the traction shaft are replaced by the snap spring clamped on the stud shaft.

Claims

1. A low-voltage fixed circuit breaker with a manual operating mechanism, characterized by: It includes a mechanism bracket (1), a planar double-link positioning mechanism, a switch-on and switch-off sliding plate (10), and a shaft sleeve crank arm mechanism. The opening and closing sliding plate (10) is used to cooperate with the dial head (16-1) of the circuit breaker (16) and operate the dial head (16-1) of the circuit breaker (16) through translational movement. The planar double-link positioning mechanism comprises two links (4), and the two links (4) are respectively connected to the mechanism bracket (1) and the opening and closing sliding plate (10), forming a parallel four-link mechanism. The opening and closing sliding plate (10) performs opening and closing translational motion under the positioning constraints of the two links (4). The shaft sleeve crank mechanism is rotatably mounted on the mechanism bracket (1). The shaft sleeve crank arm mechanism comprises a shaft sleeve (2) and a traction crank arm (8), wherein the shaft sleeve (2) is used to cooperate with the rear shaft head of the opening and closing shaft rod (18), transmit the rotation operation of the opening and closing shaft rod (18) to the traction crank arm (8), and drive the traction crank arm (8) to swing. The traction crank arm (8) cooperates with the opening and closing sliding plate (10) to drive the opening and closing sliding plate (10) to perform translational movement through the swinging action of the traction crank arm (8), thereby operating the dial head (16-1) of the circuit breaker (16); The opening and closing sliding plate (10) operates the dial head (16-1) through the dial head operating structure, the dial head operating structure being a dial head operating hole on the opening and closing sliding plate (10), the dial head operating hole being used to operate the dial head (16-1) embedded in the dial head operating hole through the side of the dial head operating hole; The circuit breaker fault undervoltage tripping assist mechanism also includes a circuit breaker fault undervoltage tripping assist mechanism, which interacts with the opening and closing sliding plate (10) during closing and tripping, and is used to elastically store energy during closing, release the stored energy to assist the opening and closing sliding plate (10) during tripping, and disengage from the opening and closing sliding plate (10) during opening.

2. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 1 is characterized in that: The connecting rod (4) is provided with a limiting shaft (5), the mechanism bracket (1) is provided with a mechanism slide groove (1-1), and the limiting shaft (5) is embedded in the mechanism slide groove (1-1).

3. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 1 is characterized in that: The driving cooperation structure of the traction crank arm (8) and the opening and closing sliding plate (10) is that the traction shaft (13) is embedded in the traction slide groove (10-1), and the traction shaft (13) and the traction slide groove (10-1) are respectively located on the traction crank arm (8) and the opening and closing sliding plate (10).

4. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 1 is characterized by: An anti-friction lining (11) is provided on the side of the dial head operating hole, and the dial head (16-1) is operated via the anti-friction lining (11).

5. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 1 is characterized by: The circuit breaker fault undervoltage tripping assist mechanism is mounted on a mechanism bracket (1). The circuit breaker fault undervoltage tripping assist mechanism is a torsion spring mechanism. A torsion spring force bearing shaft (12) is provided on the opening and closing sliding plate (10). The torsion spring mechanism interacts with the torsion spring force bearing shaft (12) through the torsion arm of the torsion spring (15) to store energy and provide assist.

6. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 1 is characterized by: The connecting rod (4) is hingedly connected to the mechanism bracket (1) and the opening and closing sliding plate (10) respectively through the connecting rod shaft (6).

7. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 2, characterized in that: The limiting shaft (5) is provided with an axial limiting structure for controlling the axial clearance between the connecting rod (4) and the mechanism bracket (1).

8. The manual operating mechanism of the low-voltage fixed circuit breaker according to claim 3 is characterized by: The traction shaft (13) is provided with an axial limiting structure for controlling the axial clearance between the traction crank arm (8) and the opening and closing sliding plate (10).

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