Three-position isolating switch mechanism

Abstract

The utility model relates to the technical field of circuit change-over switches, in particular to a three-station isolating switch mechanism. The utility model discloses a three-station disconnecting switch mechanism, which comprises a rack, a transmission assembly and a motor driving assembly, the transmission assembly and the motor driving assembly are arranged in the rack, the transmission assembly is matched with a hand rocker used for manually controlling the transmission assembly to start and stop, the transmission assembly comprises a worm gear, a stop block is fixedly arranged at one axial end of the worm gear, and a motor is arranged at the other axial end of the worm gear. The transmission assembly further comprises a first gear and a second gear, the first gear is in power connection with the hand rocker and the power end of the motor driving assembly at the same time, the second gear and the first gear are coaxially arranged, and an overload protection assembly is arranged between the first gear and the second gear. The overload protection assembly can enable the power of the first gear to be separated from the power of the second gear after the second gear is in place. The utility model has the advantage that the durability and the reliability of the three-position isolating switch mechanism can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit switching switches, in particular to a three-position isolating switch mechanism. Background Art

[0002] The Chinese patent application with application number 202311310651.6 discloses a three-station equipment with dual manual operation ports and multi-turn output, including an output linkage assembly for synchronously linking the output main shaft and the output secondary shaft, a motor drive mechanism for driving the output linkage assembly, a hand crank, an isolation drive gear and a grounding drive gear. The hand crank is detachably connected to the isolation drive gear and the grounding drive gear. The isolation drive gear and the grounding drive gear are rotatably connected to the frame. The isolation drive gear and the grounding drive gear are engaged with each other and are both used to drive the output linkage assembly. The hand crank is used to drive the isolation drive gear or the grounding drive gear to rotate. A pair of manual upper through-holes are formed on the panel for the hand crank to pass vertically; the pair of manual upper through-holes are respectively located directly above the grounding drive gear and the manual driven gear.

[0003] In the above technical solution, a hand crank is provided as a control component to control the disconnector and the earthing switch to be closed and opened when the motor drive mechanism fails. However, after the hand crank is assembled with the disconnect drive gear and the earthing drive gear, the existing three-position disconnector still needs to use a number of transmission components (such as gears, worm wheels, and worms) to close and open the disconnector and the earthing switch. Since the mechanical transmission cannot provide feedback on the operator's operation results, the operation results are only fed back to the operator by the indicator sign in the indicator window. When the three-position disconnector is used for a long time, the indicator sign in the indicator window deviates or fails, making it impossible for the operator to accurately control the number of turns of the hand crank. Continuing to rotate the hand crank causes the transmission component to rotate too far. Over time, the transmission component inside the three-position disconnector is damaged, affecting its use.

[0004] Therefore, overload protection of transmission parts is a technical problem that still needs to be solved in the prior art. Utility Model Content

[0005] The purpose of the utility model is to provide a three-position isolating switch mechanism which can protect transmission parts from overload.

[0006] To achieve the above-mentioned objectives, the utility model discloses a three-position isolating switch mechanism, comprising a frame, a transmission assembly and a motor drive assembly arranged in the frame, the transmission assembly being equipped with a hand crank for manually controlling the start and stop of the transmission assembly, the transmission assembly comprising a worm gear, a block being fixedly provided at one axial end of the worm gear, the block being capable of abutting against the axial end of the hand crank, the transmission assembly further comprising a first gear which is simultaneously power-connected to the hand crank and the power end of the motor drive assembly, and a second gear which is coaxially arranged with the first gear, an overload protection assembly being provided between the first gear and the second gear, the overload protection assembly being capable of disconnecting the power of the first gear from the power of the second gear after the second gear is in place.

[0007] When the operator drives the transmission assembly to rotate through the hand crank, the stopper rotates to the position where it abuts against the axial end of the hand crank. At this time, if the indicator in the indicator window appears and the operator continues to rotate the hand crank according to the indicator, the first gear rotates and activates the overload protection assembly between the first gear and the second gear. The overload protection assembly disconnects the power connection between the first gear and the second gear, causing the second gear to stop rotating in this state.

[0008] The utility model introduces an overload protection component between the first gear serving as a power input transmission member and the second gear serving as a power transmission member. When the operator excessively rotates the hand crank due to deviation or failure of the indicator sign, the overload protection component can respond and disconnect the power connection between the first gear and the second gear, thereby avoiding over-positioning of the transmission member due to operation and effectively preventing damage to the transmission member due to excessive rotation. The utility model has the advantage of improving the durability and reliability of the three-position isolating switch mechanism.

[0009] Preferably, the motor drive assembly includes a motor controller fixed on the frame, a power motor and a travel switch cooperating with the transmission assembly, and a power output end of the power motor is provided with a power gear, which is engaged with the first gear.

[0010] By setting up a motor controller and coordinating it with a power motor, the transmission component can be driven without human intervention, reducing the cost of manual operation.

[0011] Preferably, the overload protection assembly includes a first central shaft located at the axis center position of the first gear and a second central shaft located at the axis center position of the second gear, the first central shaft is provided with an expanded diameter portion for sleeved on the outer cylindrical surface of the second central shaft, a sleeve is provided between the second central shaft and the expanded diameter portion, the sleeve is rotatably connected to the second central shaft, a telescopic part surrounding the second central shaft is provided in the sleeve, the expanded diameter portion is provided with a protrusion near one end of the telescopic part, and a concave-convex fit is formed between the protrusion and the telescopic part.

[0012] Among them, the first central axis drives the protruding part to rotate, and the protruding part applies torque to the telescopic part through the concave-convex inclined surface between the protruding part and the telescopic part, thereby driving the second central axis to rotate synchronously through the telescopic part. When the reaction force of the second central axis is greater than the thrust of the telescopic part, the protruding part shortens the telescopic part, so that the protruding part cannot drive the telescopic part to rotate synchronously.

[0013] Preferably, the telescopic member includes a spring seat, a spring, a pressure plate and a ball. The spring is fixed on the spring seat and can rotate relative to the second central axis. The pressure plate is fixed at the elastic force output end of the spring. The pressure plate is provided with a rotating disk at one end close to the expanded diameter portion. The rotating disk is fixedly connected to the second central axis. A ball groove is provided in the rotating disk. The ball is provided in the ball groove. The inner diameter of the ball groove is larger than the diameter of the ball.

[0014] The balls rotate in a circular direction to drive the rotating disk to rotate, thereby driving the second central axis to rotate, thereby completing the transmission. Among them, the setting of the balls can return to its position more quickly and revolve around the second central axis compared to the transmission method of rollers or wheels, and thus can maintain transmission no matter at what angle it falls back into the ball groove.

[0015] Preferably, the protrusion includes a roller embedded in the expanded diameter portion near one end of the ball, the roller axis is arranged in a circular array along the expanded diameter portion, and the roller can rotate relative to the expanded diameter portion.

[0016] The balls are moved by the inclined surface contacting between the roller and the balls, so that the balls revolve around the second central axis, thereby causing the rotating disk to drive the second central axis to rotate, thus completing the transmission.

[0017] Preferably, the sleeve includes a cylindrical body and a cylindrical cover, the cylindrical cover and the cylindrical body are threadedly connected, the cylindrical cover and the cylindrical body are fixed by gluing and fitting threads, the cylindrical cover and the second central axis are rotationally connected, and the cylindrical body and the outer cylindrical surface of the expanded diameter portion are fixed by gluing and fitting threads.

[0018] By setting the sleeve as a split design, the elastic force applied by the spring to the pressure plate is controlled by the assembly position between the cylinder cover and the cylinder body. When the assembly position of the cylinder cover and the cylinder body is deeper, the thrust of the spring increases. When the assembly position of the cylinder cover and the cylinder body is shallower, the thrust of the spring decreases, thereby realizing a customized design of the pressure between the ball and the roller.

[0019] Preferably, the spring seat and the cylinder cover portion are supported against each other by a pressure bearing.

[0020] Both axial ends of the spring along the second central axis are designed to be loose, thereby reducing the friction between the ball and the pressure plate when the spring rotates with the cylinder cover; or reducing the friction between the spring seat and the cylinder cover when the spring and the pressure plate rotate with the ball.

[0021] Preferably, a stopper is provided on the inner side of the cylindrical portion, and the stopper is located on the upper side of the rotating disk, thereby limiting the axial position of the rotating disk.

[0022] Preferably, a limiting portion is provided on the diameter-enlarging portion, and the limiting portion cooperates with the axial end surface of the cylindrical portion, thereby limiting the axial position of the cylindrical portion.

[0023] The utility model can disconnect the power connection between the first gear and the second gear, avoid over-positioning of the transmission part due to operation, effectively prevent the transmission part from being damaged due to excessive rotation, and has the advantage of improving the durability and reliability of the three-position isolating switch mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the present utility model.

[0025] Figure 2 This is a schematic diagram of the structure of the utility model without a frame.

[0026] Figure 3 This is a schematic cross-sectional view of the transmission assembly when the stopper and the hand crank are in contact with each other.

[0027] Figure 4 This is a schematic structural diagram of the first gear, the second gear and the overload protection assembly of the present invention.

[0028] Figure 5 This is an exploded diagram of the overload protection component of the utility model.

[0029] Figure 6 It is a three-dimensional cross-sectional structural diagram of the overload protection component of the utility model.

[0030] In the figure: 11, frame; 12, operating hole; 13, operating gear; 14, motor controller; 15, power motor; 16, first gear; 17, second gear; 18, sleeve; 181, cylinder cover; 182, cylinder body; 1821, stopper; 19, worm gear; 20, stopper; 21, hand crank; 22, first limiting rod; 23, second limiting rod; 26, first central axis; 261, diameter expansion portion; 2611, limiting portion; 27, second central axis; 30, pressure bearing; 31, spring seat; 32, spring; 33, pressure plate; 34, ball; 35, roller. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] Depend on Figure 1 As shown, this embodiment discloses a three-position isolating switch mechanism, including a frame 11, a transmission assembly and a motor drive assembly arranged in the frame 11, two operating holes 12 are provided on the frame 11, and the transmission assembly is equipped with a hand crank 21 for manually controlling the start and stop of the transmission assembly. Figure 2 As shown, the transmission assembly includes two operating gears 13, a worm gear 19 and a transmission gear set for transmitting the operating gears 13 and the worm gear 19. The two operating holes 12 correspond to the two operating gears 13 respectively. The hand crank 21 cooperates with the operating gear 13 through the operating hole 12, so that when the hand crank 21 rotates, the operating gear 13 is driven to rotate, thereby driving the transmission gear set and the worm gear 19 to rotate. A stopper 20 is fixed at one axial end of the worm gear 19. Figure 3 As shown, the casing is provided with two first limit rods 22 and second limit rods 23 symmetrically arranged with the axis of the worm gear 19 as the center position, and the stop block 20 can respectively abut against the axial end of the hand crank 21, the first limit rod 22, and the second limit rod 23. The transmission assembly also includes a first gear 16 that is simultaneously power-connected to the hand crank 21 and the power end of the motor drive assembly, and a second gear 17 coaxially arranged with the first gear 16.

[0033] Depend on Figure 4 As shown, an overload protection component is provided between the first gear 16 and the second gear 17. The overload protection component can make the first gear 16 idle after the second gear 17 is in place. The overload protection component includes a first central shaft 26 located at the axial center position of the first gear 16 and a second central shaft 27 located at the axial center position of the second gear 17. The first central shaft 26 is provided with an expanded diameter portion 261 for sleeved on the outer circumferential surface of the second central shaft 27. A sleeve 18 is provided between the second central shaft 27 and the expanded diameter portion 261. The sleeve 18 is rotatably connected to the second central shaft 27.

[0034] Depend on Figure 5 、 Figure 6As shown, the sleeve 18 includes a barrel portion 182 and a barrel cover portion 181, the barrel cover portion 181 and the barrel portion 182 are threadedly connected, the barrel cover portion 181 and the barrel portion 182 are fixed by gluing and matching threads, the barrel cover portion 181 is rotatably connected to the second central axis 27, and the barrel portion 182 and the outer circumferential surface of the expanded diameter portion 261 are fixed by gluing and matching threads. A telescopic member surrounding the second central axis 27 is provided in the barrel portion 182, and the telescopic member includes a spring seat 31, a spring 32, a pressure plate 33 and a ball 34. The spring seat 31 and the barrel cover portion 181 are offset by a pressure bearing 30, and the spring 32 is fixed on the spring seat 31 and can be relative to the second central axis 2 7 rotates, the pressure plate 33 is fixedly arranged at the elastic force output end of the spring 32, and a rotating disk is provided at one end of the pressure plate 33 near the expanded diameter portion 261. The rotating disk is fixedly connected to the second central axis 27. A stopper 1821 is provided on the inner side of the cylindrical portion 182, and the stopper 1821 is located on the upper side of the rotating disk. A ball 34 groove is provided in the rotating disk, and the ball 34 is provided in the ball 34 groove. The inner diameter of the ball 34 groove is larger than the diameter of the ball 34. A roller 35 is provided at one end of the expanded diameter portion 261 near the ball 34. A tooth-type fit is formed between the roller 35 and the ball 34. The roller 35 is embedded in the expanded diameter portion 261 and arranged in an array along the circumference of the expanded diameter portion 261. The roller 35 can rotate relative to the expanded diameter portion 261.

[0035] Depend on Figure 6 As shown, a limiting portion 2611 is provided on the expanded diameter portion 261 , and the limiting portion 2611 cooperates with the axial end surface of the cylindrical portion 182 .

[0036] Depend on Figure 4 As shown, both the barrel portion 182 and the barrel cover portion 181 are provided with holes for easy assembly and connection with existing workpieces, thereby facilitating the operator to make detachable connections between the barrel portion 182 and the barrel cover portion 181 through the existing workpiece, thereby driving the barrel portion 182 and the barrel cover portion 181 to rotate during assembly.

[0037] The motor drive assembly includes a motor controller 14 fixed on the frame 11 , a power motor 15 and a travel switch coordinated with the transmission assembly. A power output end of the power motor 15 is provided with a power gear which meshes with the first gear 16 .

[0038] When the hand crank 21 passes through the operating hole 12 and is assembled with the operating gear 13, the operator rotates the hand crank 21, and the hand crank 21 drives the operating gear 13 to rotate. The operating gear 13 drives the first gear 16 to rotate through the gear teeth meshing, and the first gear 16 drives the first central shaft 26 to rotate, thereby rotating the roller 35 in the expanded diameter portion 261. The inclined surface of the contact between the roller 35 and the ball 34 drives the ball 34 to make the ball 34 revolve around the second central shaft 27, thereby causing the rotating disk to drive the second central shaft 27 to rotate, completing the transmission of the second central shaft 27, thereby driving the second gear 17 to rotate, and the second gear 17 is transmitted through the transmission gear set. When the transmission gear in the transmission gear set drives the worm gear 19 to rotate, the straight block 20 is in contact with the hand When the axial end of the rocker 21, the first limit rod 22, and the second limit rod 23 are against each other, the three-position disconnector mechanism completes the power transformation. At this time, if the operator continues to rotate the hand crank 21, the hand crank 21 continues to drive the first gear 16 to rotate, but at this time the block 20 cannot rotate and the reaction force of the transmission gear set is transmitted to the second gear 17. The second gear 17 keeps the second central shaft 27 stationary, and the roller 35 and the ball 34 are against each other and cause the ball 34 to jump along the axial direction of the second central shaft 27. The ball 34 passes through the ball 34 groove in the rotating disk and pushes the pressure plate 33 to compress the spring 32, converting the torque and torque transmission between the first central shaft 26 and the second central shaft 27 into torque and elastic force conversion, thereby overload protection of the transmission parts.

Claims

1. A three-position disconnect switch mechanism, comprising a frame, a transmission assembly disposed within the frame, and a motor drive assembly, wherein the transmission assembly is equipped with a hand crank for manually controlling the start and stop of the transmission assembly, the transmission assembly including a worm gear, and characterized in that: A stopper is fixedly provided at one axial end of the worm gear, and the stopper can abut against the axial end of the hand crank. The transmission assembly also includes a first gear that is simultaneously power-connected to the hand crank and the power end of the motor drive assembly, and a second gear that is coaxially arranged with the first gear. An overload protection assembly is provided between the first gear and the second gear, and the overload protection assembly can disconnect the power of the first gear from the power of the second gear after the second gear is in place.

2. A three-position isolating switch mechanism according to claim 1, characterized in that: The motor drive assembly includes a motor controller fixed on the frame, a power motor and a travel switch matched with the transmission assembly. The power output end of the power motor is provided with a power gear, and the power gear is meshed with the first gear.

3. A three-position isolating switch mechanism according to claim 1 or 2, characterized in that: The overload protection assembly includes a first central shaft located at the axis center position of the first gear and a second central shaft located at the axis center position of the second gear. The first central shaft is provided with an expanded diameter portion for sleeved on the outer cylindrical surface of the second central shaft. A sleeve is provided between the second central shaft and the expanded diameter portion. The sleeve is rotatably connected to the second central shaft. A telescopic part surrounding the second central shaft is provided in the sleeve. A protruding part is provided on the expanded diameter portion near one end of the telescopic part, and a concave-convex fit is formed between the protruding part and the telescopic part.

4. A three-position isolating switch mechanism according to claim 3, characterized in that: The telescopic member includes a spring seat, a spring, a pressure plate and a ball. The spring is fixed on the spring seat and can rotate relative to the second central axis. The pressure plate is fixed on the elastic force output end of the spring. The pressure plate is provided with a rotating disk at one end close to the expanded diameter portion. The rotating disk is fixedly connected to the second central axis. A ball groove is provided in the rotating disk. The ball is provided in the ball groove. The inner diameter of the ball groove is larger than the diameter of the ball.

5. A three-position isolating switch mechanism according to claim 4, characterized in that: The protruding member includes a roller embedded in the expanded diameter portion close to one end of the ball, the roller axis is arranged in an array along the circumference of the expanded diameter portion, and the roller can rotate relative to the expanded diameter portion.

6. A three-position isolating switch mechanism according to claim 4, characterized in that: The sleeve includes a cylindrical body and a cylindrical cover. The cylindrical cover is threadedly connected to the cylindrical body, and the cylindrical cover is fixed to the cylindrical body by gluing and fitting threads. The cylindrical cover is rotationally connected to the second central axis, and the cylindrical body is fixed to the outer cylindrical surface of the expanded diameter portion by gluing and fitting threads.

7. A three-position isolating switch mechanism according to claim 6, characterized in that: The spring seat and the cylinder cover portion are in contact with each other via a pressure bearing.

8. The three-position isolating switch mechanism according to claim 6, characterized in that: A stopper is provided on the inner side of the cylindrical body, and the stopper is located on the upper side of the rotating disk.

9. The three-position isolating switch mechanism according to claim 6, characterized in that: The diameter-enlarging portion is provided with a limiting portion, and the limiting portion matches the axial end surface of the cylindrical portion.

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