Three-position linear operating mechanism

Abstract

The present invention discloses a three-station linear operating mechanism, which includes a rear assembly plate, a middle mounting plate, a front mounting plate, an operating shaft assembly, a transmission assembly, a positioning shaft, a sensor assembly and a limit assembly. The operating shaft assembly and the positioning shaft pass through the front mounting plate, the middle mounting plate and the rear assembly plate in sequence from front to back. The rear end of the operating shaft assembly is connected to the power input end of the transmission assembly, and the power output end of the transmission assembly is connected to the positioning shaft. The sensor assembly is arranged on the front mounting plate and is located near the front end of the positioning shaft. The limit assembly is arranged between the front mounting plate and the middle mounting plate, and the limit assembly cooperates with the operating shaft assembly and the positioning shaft respectively. The three-station linear operating mechanism of the present invention has a greatly simplified structure, avoids the use of large torque torsion springs, and is easier to assemble and manufacture. There is only one operating shaft, so misoperation will not occur, the failure rate is greatly reduced, and the safety is high.

Description

Technical Field

[0001] The invention relates to the field of circuit breaker switches, and in particular to a three-position linear operating mechanism. Background Art

[0002] A three-position switch is a circuit breaker switch assembly with a closing position, an opening position, and a grounding position. A three-position linear operating mechanism is an operating mechanism that realizes switching operations between the three positions. A three-position linear switch refers to a three-position switch that realizes closing, opening, and grounding operations through linear motion. A three-position linear operating mechanism is an operating mechanism for a three-position switch. When the existing three-position linear operating mechanism performs closing, opening, and grounding operations, it usually needs to store energy through an energy storage mechanism before closing, opening, or grounding operations can be performed. Because an energy storage mechanism needs to be set up, the structure of the limit assembly of the three-position linear operating mechanism is very complicated, and a complicated torsion spring limit mechanism needs to be designed, such as the three-position vacuum circuit breaker spring operating mechanism disclosed in the patent document with publication number CN110648879A, and a solid insulation cabinet operating mechanism disclosed in the patent document with publication number CN105070550A. The three-position linear operating mechanism therein stores energy through a torsion spring. When the operating shaft rotates, one arm of the torsion spring is driven to rotate, causing the spring to deform to store energy. When the torsion spring rotates, a complicated limit structure is required to maintain the energy storage state. The limit structure needs to withstand a large force, and thus has high requirements on the structure of the limit mechanism. Therefore, it is necessary to improve the existing three-position linear operating mechanism. Moreover, the existing three-position switch usually needs to be provided with a gear and a sector gear, with the rotating shaft of the gear and the sector gear as the operating shaft, and the rotating shaft of the gear as the output shaft, and the power is transmitted through the meshing of the sector gear and the gear. Because there are two operating positions, when performing manual operation, it is necessary to select the corresponding operating position for operation according to the operation requirements, which is easy to operate incorrectly. Therefore, a complex interlocking mechanism is usually designed on the housing of the three-position switch, and it is usually necessary to design a five-protection interlocking or more interlocking mechanism, which makes the structure of the three-position switch very complicated, and thus the failure rate will increase accordingly. Summary of the invention

[0003] The purpose of the present invention is to provide a three-station linear operating mechanism in view of the problems that the existing three-station linear operating mechanism described in the background technology requires the design of complex spring energy storage components, requires the design of complex interlocking mechanisms, has complex structures, and has a high failure rate.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a three-station linear operating mechanism, which includes a rear assembly plate, a middle mounting plate, a front mounting plate, an operating shaft assembly, a transmission assembly, an output shaft, a sensor assembly and a limit assembly. The operating shaft assembly and the positioning shaft pass through the front mounting plate, the middle mounting plate and the rear assembly plate from front to back in sequence. The rear end of the operating shaft assembly is connected to the power input end of the transmission assembly, and the power output end of the transmission assembly is connected to the positioning shaft. The sensor assembly is arranged on the front mounting plate and is located near the front end of the positioning shaft. The limit assembly is arranged between the front mounting plate and the middle mounting plate, and the limit assembly is respectively matched with the operating shaft assembly and the positioning shaft.

[0005] As a further improvement of the above scheme, the operating shaft assembly includes an operating handle and an operating shaft, the operating shaft is rotatably connected to the front mounting plate, the middle mounting plate and the rear mounting plate through bearings, and the operating handle is connected to the front end of the operating shaft. By setting the operating handle, after being connected to the operating shaft, the closing, opening or grounding operations can be performed manually.

[0006] As a further improvement of the above scheme, it also includes an electric drive assembly and a clutch assembly, the electric drive assembly includes a motor and a gear set, the output shaft of the motor is fixedly connected to the driving gear, the driving gear is meshed with the driven gear, the driven gear is arranged on the operating shaft, and the driven gear and the operating shaft are rotationally matched, and a spacer sleeve for axially limiting the driven gear is provided on the operating shaft, the clutch assembly includes a first clutch wheel and a second clutch wheel, the first clutch wheel is arranged on the operating shaft and located at the front side of the driven gear, the first clutch wheel is rotationally matched with the operating shaft, the second clutch wheel is arranged on the operating shaft and located at the front side of the first clutch wheel, the second clutch wheel is fixedly connected to the operating shaft, and a plurality of spherical grooves are provided on a side surface of the driven gear facing the first clutch wheel A steel ball is provided in each spherical groove, a spherical groove corresponding to the steel ball is provided on one side of the first clutch wheel facing the driven gear, a convex tooth is provided on one side of the first clutch wheel facing the second clutch wheel, and a groove is provided on one side of the second clutch wheel facing the first clutch wheel, the convex tooth on the first clutch wheel matches the shape and position of the groove on the second clutch wheel, the first clutch wheel can slide axially on the operating shaft, slide toward the front side, so that the convex tooth on the first clutch wheel is engaged with the groove on the second clutch wheel, or slide toward the rear side, so that the convex tooth on the first clutch wheel is separated from the groove on the second clutch wheel, when the convex tooth on the first clutch wheel is engaged with the groove on the second clutch wheel, the steel ball is still partially located in the spherical groove on the first clutch wheel. By setting up an electric drive assembly and a clutch assembly, manual operation and electric operation can be achieved. When manual operation is performed, the first clutch wheel of the clutch assembly is separated from the second clutch wheel, disconnecting the power transmission with the motor, so that manual operation can be carried out smoothly. When electric operation is performed, the first clutch wheel is combined with the second clutch wheel, so that the power of the motor is transmitted to the operating shaft through the gear transmission mechanism and the first clutch wheel and the second clutch wheel, so as to realize the electric operation of the three-station linear operating mechanism. The clutch mechanism has a simple structure, is easy to operate, and can realize automatic clutch.

[0007] As a further improvement of the above scheme, the operating handle comprises an inner connecting sleeve, a connecting rod shaft and a handle, the rear side portion of the inner connecting sleeve is sleeved with the front end of the operating shaft, a rotation limit portion cooperating with the operating shaft is provided on the rear side portion of the inner connecting sleeve, the front side portion of the inner connecting sleeve is sleeved with the connecting rod shaft, and a rotation limit portion cooperating with the connecting rod shaft is provided on the front side portion of the inner connecting sleeve. The handle is fixedly connected to the front end portion of the connecting rod shaft, and a limit sleeve is also sleeved on the inner connecting sleeve, the limit sleeve is fixedly connected to the inner connecting sleeve, the rear side end of the connecting rod shaft passes through the limit sleeve and extends into the inner connecting sleeve, a limit pin is provided on the connecting rod shaft, the limit pin is arranged along the radial direction of the connecting rod shaft, a limit groove is provided on the limit sleeve, two ends of the limit pin extend into the limit grooves on the limit sleeve, a compression spring is provided on the connecting rod shaft, the rear side end of the compression spring is pressed against the front side end face of the limit sleeve, and the front side end face of the compression spring is pressed against the limit ring on the handle. Through this arrangement, the inner connecting sleeve of the operating handle can be quickly connected or disconnected with the operating shaft, thereby improving operating efficiency; the limit sleeve is fixedly connected to the inner connecting sleeve, and the connecting rod shaft is plugged into the inner connecting sleeve. The connecting rod shaft can be limited axially and circumferentially through the cooperation of the limit pin and the limit sleeve. Under the action of the compression spring, the front end of the connecting rod shaft can be separated from the inner connecting sleeve. When in use, the connecting rod shaft can be entered into the inner connecting sleeve by pushing the handle backward, thereby realizing the connection between the connecting rod shaft and the inner connecting sleeve.

[0008] As a further improvement of the above scheme, the transmission assembly includes a bevel gear transmission mechanism and a worm gear transmission mechanism, a bearing seat is provided between the middle mounting plate and the rear assembly plate, a bearing is provided on the bearing seat, the worm gear mechanism includes a meshing worm wheel and a worm, the worm is provided on the bearing seat, the worm wheel is fixedly connected to the positioning shaft, the driving bevel gear of the bevel gear transmission mechanism is provided at the rear side of the operating shaft, and the driven bevel gear is provided at the end of the worm. The power transmission of the operating shaft toward the positioning shaft can be realized through the bevel gear transmission mechanism and the worm gear transmission mechanism.

[0009] As a further improvement of the above scheme, the sensor assembly includes a turntable, a micro-pressure block and a micro-switch. The turntable is fixedly connected to the positioning shaft and is located on the front side of the front mounting plate. The micro-pressure blocks include three and are fixedly arranged on the turntable with a certain circumferential spacing. The micro-switches include three and are arranged on the front mounting plate with a circumferential spacing corresponding to the micro-pressure blocks. The three micro-switches correspond to the three micro-pressure blocks one by one. By setting the sensor assembly, the rotation angle of the positioning shaft can be judged. When the micro-pressure block rotates to the corresponding micro-switch position, the micro-switch is triggered, and at this time it is in the state of closing, opening or grounding. The micro-switch can send a corresponding signal to the control device of the three-position switch to feedback the current state of the three-position switch. When the three-position switch is operated electrically, the motor can be controlled to stop rotating.

[0010] As a further improvement of the above scheme, the limit assembly includes a limit plate, a first connecting rod, a second connecting rod, a third connecting rod, a limit column and a tension spring, the limit plate is fixedly connected to the positioning shaft and is located between the front mounting plate and the middle mounting plate, an arc-shaped limit groove is provided on the limit plate, a limit rod is provided on the middle mounting plate, the front side end of the limit rod is located in the arc-shaped limit groove, the limit rod can limit the rotation angle of the limit plate, and thus limit the rotation angle of the positioning shaft. Three limit grooves are provided on the outer circumferential surface of the limit plate, the right end of the first connecting rod is connected to the middle mounting plate through a connecting column, the first connecting rod is rotatably matched with the connecting column, the first connecting rod is arranged below the limit plate, and a convex tooth is provided on the first connecting rod, the shape of the convex tooth matches the shape of the limit groove on the limit plate, when the limit groove on the limit plate rotates to the convex tooth, the first connecting rod rotates upward, and the convex tooth can be combined with the limit groove on the limit plate; the limit column is arranged The left end portion of the first connecting rod and the limit column are connected to the front side of the first connecting rod, the limit column passes through the front mounting plate and extends to the side of the operating handle, and a limit portion corresponding to the limit column is provided on the limit sleeve. When the first connecting rod is rotated upward and the convex tooth is combined with the limit groove on the limit plate, the limit column rises to the side of the limit portion to block the rotation of the operating handle. The middle part of the first connecting rod is provided with a connecting column, the rear end of the connecting column is fixedly connected to the first connecting rod, and the front end of the connecting column extends to the front side of the front mounting plate. The lower end of the second connecting rod is movably connected to the front end of the connecting column, the upper end of the second connecting rod is movably connected to the middle part of the third connecting rod, and the right end of the third connecting rod is movably connected to the front mounting plate through the connecting column, and the left end of the third connecting rod extends to the side of the limit sleeve, and a limit step surface is provided on the limit sleeve at the rear side of the third connecting rod, the middle part of the first connecting rod is connected to the lower end of the tension spring, and the upper end of the tension spring is fixedly connected to the middle mounting plate through a pin rod.By setting a limit assembly, the operation process of the three-position linear operating mechanism can be limited to protect. When the three-position linear operating mechanism is operated, the limit plate rotates with the positioning shaft. When a limit groove on the limit plate is opposite to the convex tooth on the first connecting rod, the first connecting rod will rotate upward under the action of the tension spring, and the convex tooth on the first connecting rod will combine with the limit groove on the limit plate. The three-position switch is in any one of the closing, opening or grounding states. In this way, one of the closing, opening or grounding operations of the three-position switch is completed. At this time, due to the rise of the first connecting rod, the limit column at the left end of the first connecting rod will rise accordingly, blocking the limit part on the limit sleeve, thereby blocking the continued rotation of the operating handle. At the same time, the second connecting rod and the third connecting rod are The third connecting rod will rise, and when the third connecting rod rises, the left end of the third connecting rod will be away from the limiting step surface on the limiting sleeve on the operating handle. At this time, the operating handle can be pulled forward to take out the operating handle. When starting manual operation next time, the operating handle needs to be plugged into the operating shaft. When plugging, the limiting column can be pressed down to the lower limit portion below the limiting sleeve on the operating handle. The operating handle can continue to be rotated. As the operating handle drives the operating shaft to rotate, the convex teeth on the first connecting rod are separated from the limiting grooves on the limiting wheel. Under the thrust of the limiting wheel, the first connecting rod drops below the limiting sleeve. At the same time, the second connecting rod and the third connecting rod drop accordingly. The left end of the third connecting rod drops to the front side of the limiting step surface on the limiting sleeve, which can block the pulling out of the operating handle. Through the above-mentioned setting, the operator can judge whether the rotation of the operating shaft is in place when performing manual operation, and can also prevent the operating handle from being pulled out midway, so that the three-position switch can only be in one of the three states of closing, opening or grounding.

[0011] As a further improvement of the above scheme, the middle mounting plate is provided with a first micro switch, which is arranged below the first connecting rod. When the protruding teeth on the first connecting rod are separated from the limiting groove on the limiting plate, the lower end surface of the first connecting rod pushes on the first micro switch. When the protruding teeth on the first connecting rod are combined with the limiting groove on the limiting plate, the lower end surface of the first connecting rod is separated from the micro switch. By setting the first micro switch, the state of the three-position switch can be detected. When the protruding teeth on the first connecting rod are opposite to the limiting groove on the limiting plate, the first connecting rod will rise under the action of the tension spring, so that the lower end surface of the first connecting rod is separated from the first micro switch. The first micro switch is triggered, and a signal can be sent to the control device of the three-position switch. Like the signal triggered by the micro pressure block and the micro switch, the current state of the three-position switch can be fed back. When the three-position switch is operated electrically, the motor can be controlled to stop rotating.

[0012] As a further improvement of the above scheme, the middle mounting plate is provided with a first limit seat, the first limit seat is provided with a limit hole, the left end of the first connecting rod passes through the limit hole, the front mounting plate is provided with a second limit seat, the second limit seat is arranged on the left side of the third connecting rod, the second limit seat is provided with a limit hole, the third connecting rod passes through the limit hole and extends to the side of the limit sleeve. By providing the first limit seat and the second limit seat, the up and down range of movement of the first connecting rod and the third connecting rod can be limited to prevent the movement distance from being too large and causing a malfunction.

[0013] As a further improvement of the above scheme, a front protective cover is also provided on the front mounting plate, which is fixedly connected to the front mounting plate, an operating door is provided at a position of the front protective cover corresponding to the operating axis, the operating door is movably connected to the front protective cover, an operating door mounting seat is provided on the front mounting plate, a second micro switch is provided on the operating door mounting seat, the upper end of the operating door is movably connected to the operating door mounting seat through an upper connecting plate, when the operating door is opened, the upper connecting plate is pressed against the second micro switch, a lower connecting plate is provided at the lower end of the operating door, a guide connecting plate is provided on the front mounting plate, a mounting hole is provided on the front mounting plate, the rear end of the guide connecting plate passes through the mounting hole, and a limiting portion is provided at the rear end of the mounting hole, a compression spring is provided on the guide connecting plate, and the lower connecting plate is movably connected to the front end of the guide connecting plate. By setting up a front protective cover, the front side components of the three-position linear operating mechanism can be protected. By setting up an operating door, it is convenient to open the operating door and plug in the operating handle to perform manual operation. When the operating door is opened, the upper connecting plate at the upper end of the operating door presses on the second micro switch, triggering the second micro switch. The second micro switch can send a corresponding signal to the control device of the three-position switch to feedback the current status.

[0014] It should be noted that the front-to-back direction is the direction from the front assembly plate to the rear assembly plate.

[0015] The present invention has positive effects: 1) Compared with the existing three-position linear operating mechanism using energy storage springs, the three-position linear operating mechanism of the present invention has a greatly simplified structure, the number of parts of the three-position linear operating mechanism is greatly reduced, and the use of large-torque torsion springs is avoided, and assembly and manufacturing are simpler; 2) The three-position linear operating mechanism of the present invention is easier to operate, and has only one operating shaft. During operation, it is only necessary to rotate the operating shaft to perform corresponding operations on the three-position switch, and no misoperation will occur, and the failure rate is greatly reduced; 3) The three-position linear operating mechanism of the present invention does not need to design a complex interlocking mechanism, and the structure is greatly simplified, the failure rate is very low, and the safety is high; 4) The three-position linear operating mechanism of the present invention can design an electric drive component on the operating shaft to realize the automatic operation of the three-position linear operating mechanism, improve the accuracy and efficiency of the operation, and save labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Instruction Manual

[0017] Figure 1 It is a structural schematic diagram of a three-position linear operating mechanism.

[0018] Figure 2 It is a structural diagram of the three-station linear operating mechanism (operating door is open).

[0019] Figure 3 This is a schematic diagram of the structure of the three-position linear operating mechanism (removing the front protective cover).

[0020] Figure 4 This is a schematic diagram of the structure of the three-position linear operating mechanism (excluding the front protective cover and operating door).

[0021] Figure 5 This is a schematic diagram of the structure of the three-station linear operating mechanism (excluding the front protective cover, operating door and front mounting plate).

[0022] Figure 6 It is a structural schematic diagram of the three-station linear operating mechanism (excluding the front protective cover and operating door and the front mounting plate, middle mounting plate and rear mounting plate).

[0023] Figure 7 It is a schematic diagram of the structure of the limit component.

[0024] Figure 8 It is a schematic diagram of the connection structure between the operating shaft and the operating handle.

[0025] Fig. 9 for Figure 8 AA section view in.

[0026] Fig.10 It is a schematic diagram of the structure of the electric drive component and the clutch component.

[0027] Fig.11 Schematic diagram of the structure of the electric drive component.

[0028] Fig.12 It is a schematic diagram of the assembly structure of the driven gear and the steel ball.

[0029] Fig.13 It is a schematic diagram of the rear side structure of the first clutch wheel.

[0030] Fig.14 It is a schematic diagram of the front side structure of the first clutch wheel.

[0031] Fig.15 It is a schematic diagram of the structure of the second clutch wheel.

[0032] In the figure, the assembly skeleton 1, the rear assembly plate 11, the middle mounting plate 12, the limit rod 121, the first limit seat 122, the first micro switch 123, the front mounting plate 13, the second limit seat 131, the operating door mounting seat 132, the second micro switch 133, the guide connecting plate 134, the compression spring 135, the connecting column 14, the front protective cover 15, the operating door 151, the upper connecting plate 152, the lower connecting plate 153, the operating shaft assembly 2, the operating handle 21, the inner connecting sleeve 211, the connecting rod shaft 212, the limit pin 2121, the handle 213, the limit sleeve 214, the limit groove 2141, the limit step surface 2142, the limit portion 2143, the compression spring 215, the limit ring 216, the operating shaft 22, the transmission assembly 3, Bevel gear transmission mechanism 31, worm gear transmission mechanism 32, bearing seat 33, positioning shaft 4, sensor assembly 5, turntable 51, micro-motion pressure block 52, micro-switch 53, limit assembly 6, limit plate 61, limit groove 611, arc-shaped limit groove 612, first connecting rod 62, convex tooth 621, second connecting rod 63, third connecting rod 64, limit column 65, tension spring 66, sensor assembly 7, turntable 71, micro-motion pressure block 72, micro-switch 73, electric drive assembly 8, motor 81, gear set 82, driven gear 821, spherical groove 8211, clutch assembly 9, first clutch wheel 91, spherical groove 911, convex tooth 912, second clutch wheel 92, groove 921, steel ball 93, retaining ring 94, limit column 95. DETAILED DESCRIPTION

[0033] The technical scheme of the present invention is clearly and completely described below through embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1-Figure 15 As shown, the three-station linear operating mechanism of the present invention includes a rear assembly plate 11, a middle mounting plate 12, a front mounting plate 13, an operating shaft assembly 2, a transmission assembly 3, a positioning shaft 4, a sensor assembly 7 and a limit assembly 6.

[0035] The rear assembly plate 11 is arranged at the rear side of the three-position linear operating mechanism, and can usually be fixedly connected to the switch cabinet of the three-position switch. The middle mounting plate 12 is arranged at the front side of the rear assembly plate 11, and the front mounting plate 13 is arranged at the front side of the middle mounting plate 12. Connecting columns 14 are arranged between the middle mounting plate 12 and the rear assembly plate 11, and between the middle mounting plate 12 and the front mounting plate 13. The front mounting plate 13, the middle mounting plate 12 and the rear assembly plate 11 are fixedly connected by the connecting columns 14, forming the assembly skeleton of the three-position linear operating mechanism.

[0036] The positioning shaft 4 passes through the front mounting plate 13, the middle mounting plate 12 and the rear assembly plate 11 from front to rear, and the front mounting plate 13, the middle mounting plate 12 and the rear assembly plate 11 are respectively provided with bearings that match the positioning shaft 4. In order to facilitate the assembly of the bearings, the bearings can preferably adopt flange bearings. The front end of the positioning shaft 4 extends to the front side of the front mounting plate, and the front end of the positioning shaft 4 is connected to the limit plate 61, the status display plate and other components.

[0037] The operating shaft assembly 2 includes an operating handle 21 and an operating shaft 22. The operating shaft 22 passes through the front mounting plate 13, the middle mounting plate 12 and the rear assembly plate 11 from front to rear in sequence. Bearings that match the operating shaft 22 are respectively provided on the front mounting plate 13, the middle mounting plate 12 and the rear assembly plate 11. In order to facilitate the assembly of the bearings, flange bearings can be preferably used for the bearings. The rear end of the operating shaft 22 extends to the rear side of the rear assembly plate 11, and can be connected to the knife assembly for the closing, opening and grounding operations of the three-position switch. The closing, opening or grounding operations of the three-position switch are realized by the rotation of the operating shaft 22. The specific structure of the knife assembly is common knowledge and will not be described here.

[0038] The operating handle 21 includes an inner connecting sleeve 211, a connecting rod shaft 212 and a handle 213. The operating handle 21 is connected to the front end of the operating shaft 22. The rear side of the inner connecting sleeve 211 is sleeved with the front end of the operating shaft 22, and a rotation limiting portion cooperating with the operating shaft 22 is provided at the rear side of the inner connecting sleeve 211. The front side of the inner connecting sleeve 211 is sleeved with the connecting rod shaft 212, and a rotation limiting portion cooperating with the connecting rod shaft 212 is provided at the front side of the inner connecting sleeve 211. The handle 213 is fixedly connected to the front end of the connecting rod shaft 212. In order to facilitate the rotational limitation of the inner connecting sleeve 211 and the operating shaft 22, corresponding limiting structures can be designed at the front ends of the inner connecting sleeve 211 and the operating shaft 22, such as a tooth groove structure. As shown in the accompanying drawings, a notch can be set at the front end of the operating shaft 22, and a hole of the same shape as the operating shaft can be designed in the inner hole of the inner connecting sleeve 211 to achieve the purpose of rotational limitation, so that after the inner connecting sleeve 211 is plugged into the operating shaft 22, the operating shaft can be driven to rotate by turning the operating handle.

[0039] For limiting the position, a limiting sleeve 214 is also sleeved on the inner connecting sleeve 211, and the limiting sleeve 214 is fixedly connected to the inner connecting sleeve 211. The rear end of the connecting rod shaft 212 passes through the limiting sleeve 214 and extends into the inner connecting sleeve 211. A limiting pin 2121 is provided on the connecting rod shaft 212. The limiting pin 2121 is arranged along the radial direction of the connecting rod shaft 212. A limiting groove 2141 is provided on the limiting sleeve 214. Both ends of the limiting pin 2121 extend into the limiting groove 2141 on the limiting sleeve 214. A compression spring 215 is provided on the connecting rod shaft 212. The rear end of the compression spring 215 is pressed against the front end face of the limiting sleeve 214, and the front end face of the compression spring 215 is pressed against the limiting ring 216 on the handle 213. The limiting groove 2141 can be designed as a long hole so that the limiting pin 2121 can slide axially in the limiting groove 2141, and the front end of the limiting groove 2141 is designed as a tapered hole to limit the limiting pin 2121 circumferentially so that it can rotate with the connecting rod shaft 212. Through this arrangement, the inner connecting sleeve 211 of the operating handle 21 can be quickly connected or disconnected with the operating shaft 22, thereby improving operating efficiency. The limiting sleeve 214 is fixedly connected to the inner connecting sleeve 211, and the connecting rod shaft 212 is plugged into the inner connecting sleeve 211. The connecting rod shaft 212 can be limited axially and circumferentially through the cooperation of the limiting pin 2121 and the limiting sleeve 214. Under the action of the compression spring 215, the front end of the connecting rod shaft 212 can be disengaged from the inner connecting sleeve 211. When in use, the connecting rod shaft 212 can be made to enter the inner connecting sleeve 211 by pushing the handle 213 backward, thereby realizing the connection between the connecting rod shaft 212 and the inner connecting sleeve 211.

[0040] In order to electrically drive the operation of the three-position linear operating mechanism, an electric drive assembly 8 and a clutch assembly 9 may also be provided.

[0041] The electric drive assembly 8 includes a motor 81 and a gear set 82. The output shaft of the motor 81 is fixedly connected to the driving gear, which meshes with the driven gear 821. The driven gear 821 is arranged on the operating shaft 22, and the driven gear 821 rotates with the operating shaft 22. A spacer is provided on the operating shaft 22 to limit the axial position of the driven gear 821. The clutch assembly 9 includes a first clutch wheel 91 and a second clutch wheel 92. The first clutch wheel 91 is arranged on the operating shaft 22 and is located at the front side of the driven gear 821. The first clutch wheel 91 rotates with the operating shaft 22. The second clutch wheel 92 is arranged on the operating shaft 22 and is located at the front side of the first clutch wheel 91. The second clutch wheel 92 is fixedly connected to the operating shaft 22. A plurality of spherical grooves 8211 are provided on one side of the driven gear 821 facing the first clutch wheel 91. A steel ball 93 is provided in each spherical groove 8211. The first clutch A spherical groove 911 corresponding to the steel ball 93 is provided on one side of the wheel 91 facing the driven gear 821, a convex tooth 912 is provided on one side of the first clutch wheel 91 facing the second clutch wheel 92, and a groove 921 is provided on one side of the second clutch wheel 92 facing the first clutch wheel 91. The convex tooth 912 on the first clutch wheel 91 matches the groove 921 on the second clutch wheel 92 in shape and position. The first clutch wheel 91 can slide axially on the operating shaft 22, slide toward the front side so that the convex tooth 912 on the first clutch wheel 91 is combined with the groove 921 on the second clutch wheel 92, or slide toward the rear side so that the convex tooth 912 on the first clutch wheel 91 is separated from the groove 921 on the second clutch wheel 92. When the convex tooth 912 on the first clutch wheel 91 is combined with the groove 921 on the second clutch wheel 92, the steel ball 93 is still partially located in the spherical groove 911 on the first clutch wheel 91. A slot is provided on the circumference of the first clutch wheel 91, through which the first clutch wheel is connected to the spring 94, and the two side arms of the spring 94 are clamped in the slot on the circumference of the first clutch wheel 91. A limit portion is provided in the middle of the spring 94, and a limit column 95 is provided on the middle mounting plate 12 of the three-station operating mechanism. The limit column 95 is combined with the limit portion to limit the rotation of the spring 94. By setting the electric drive assembly 8 and the clutch assembly 9, the manual operation and the electric operation can be realized. When the manual operation is performed, the first clutch wheel 91 of the clutch assembly 9 is separated from the second clutch wheel 92, and the power transmission with the motor 81 is disconnected, so that the manual operation can be carried out smoothly. When the electric operation is performed, the first clutch wheel 91 is combined with the second clutch wheel 92, so that the power of the motor 81 is transmitted to the operating shaft 22 through the gear transmission mechanism 82 and the first clutch wheel 91 and the second clutch wheel 92, so as to realize the electric operation of the three-station linear operating mechanism. The clutch mechanism has a simple structure, is easy to operate, and can achieve automatic clutching.

[0042] The rear end of the operating shaft 22 is connected to the power input end of the transmission assembly 3, and the power output end of the transmission assembly 3 is connected to the positioning shaft 4. The transmission assembly 3 includes a bevel gear transmission mechanism 31 and a worm gear transmission mechanism 32. A bearing seat 33 is provided between the middle mounting plate 12 and the rear assembly plate 11. A bearing is provided on the bearing seat 33. The worm gear mechanism 32 includes a meshing worm wheel and a worm. The worm is arranged on the bearing seat 33. The worm wheel is fixedly connected to the positioning shaft 4. The active bevel gear of the bevel gear transmission mechanism 31 is arranged on the rear side of the operating shaft 22, and the driven bevel gear is arranged at the end of the worm. In order to make the assembly of the worm more stable, two groups of bearing seats 33 can be provided, and the bearings in the two groups of bearing seats 33 are respectively connected to the two ends of the worm. Through the bevel gear transmission mechanism 31 and the worm gear transmission mechanism 32, the power transmission of the positioning shaft of the operating shaft can be realized, and then the limit plate and the turntable on the positioning shaft are driven to rotate, showing the state of the three-position switch.

[0043] The limit assembly 6 includes a limit plate 61, a first connecting rod 62, a second connecting rod 63, a third connecting rod 64, a limit column 65 and a tension spring 66. The limit plate 61 is fixedly connected to the positioning shaft 4 and is located between the front mounting plate 13 and the middle mounting plate 12. In order to limit the rotation angle of the positioning shaft 4 and avoid operational errors, an arc-shaped limit groove 612 is provided on the limit plate 61, and a limit rod 121 is provided on the middle mounting plate 12. The front side end of the limit rod 121 is located in the arc-shaped limit groove 612. The limit rod 121 can limit the rotation angle of the limit plate 61, thereby limiting the rotation angle of the positioning shaft 22. Three limiting grooves 611 are provided on the outer circumference of the limiting plate 61. The right end of the first connecting rod 62 is connected to the middle mounting plate 12 through a connecting column. The first connecting rod 62 is rotatably matched with the connecting column. The first connecting rod 62 is arranged below the limiting plate 61. A convex tooth 621 is provided on the first connecting rod 62. The shape of the convex tooth 621 matches the shape of the limiting groove 611 on the limiting plate 61. When the limiting groove 611 on the limiting plate 61 rotates to the convex tooth 621, the tension spring 66 is engaged. Under the action of pulling force, the first connecting rod 62 rotates upward, and the convex tooth 621 can be combined with the limiting groove 611 on the limiting plate 61; the limiting column 65 is arranged at the left end of the first connecting rod 62, and the limiting column 65 is connected to the front side of the first connecting rod 62, and the limiting column 65 passes through the front mounting plate 13 and extends to the side of the operating handle 21, and a limiting sleeve 214 is provided on the operating handle 21, and the limiting sleeve 214 is sleeved on the inner connecting sleeve 211, and the limiting sleeve 214 is fixed to the inner connecting sleeve 211 The limiting sleeve 214 is provided with a limiting portion 2143 corresponding to the limiting column 65. When the first connecting rod 62 rotates upward, the protruding tooth 621 is combined with the limiting groove 611 on the limiting plate 61, and the limiting column 65 rises to the side of the limiting portion 2143 to block the rotation of the operating handle 21. The middle part of the first connecting rod 62 is provided with a connecting column, the rear end of the connecting column is fixedly connected to the first connecting rod 62, and the front end of the connecting column extends to the front side of the front mounting plate 13. The lower end of the second connecting rod 63 is movable. The second connecting rod 63 is movably connected to the front end of the connecting column, the upper end of the second connecting rod 63 is movably connected to the middle part of the third connecting rod 64, the right end of the third connecting rod 64 is movably connected to the front mounting plate 13 through the connecting column, the left end of the third connecting rod 64 extends to the side of the limiting sleeve 214, and a limiting step surface 2142 is provided on the limiting sleeve 214 at the rear side of the third connecting rod 64, the middle part of the first connecting rod 62 is connected to the lower end of the tension spring 66, and the upper end of the tension spring 66 is fixedly connected to the middle mounting plate 12 through a pin.By setting the limit assembly 6, the operation process of the three-position linear operating mechanism can be limited and protected. When the three-position linear operating mechanism is operated, the limit plate 61 rotates with the positioning shaft 4. When a certain limit groove 611 on the limit plate 61 is opposite to the convex tooth 621 on the first connecting rod 62, the first connecting rod 62 will rotate upward under the action of the tension spring 66, and the convex tooth 621 on the first connecting rod 62 will combine with the limit groove 611 on the limit plate 61. The three-position switch is just in any one of the closing, opening or grounding states. In this way, one of the closing, opening or grounding operations of the three-position switch is completed. At this time, due to the rise of the first connecting rod, the limit column 65 at the left end of the first connecting rod 62 will rise accordingly, blocking the limit part 2143 on the limit sleeve 214, thereby blocking the continued rotation of the operating handle. At the same time, the second connecting rod and the third connecting rod will rise, and when the third connecting rod 64 rises, the third connecting rod The left end of the rod 64 will be away from the limiting step surface 2142 on the limiting sleeve 214 on the operating handle 21. At this time, the operating handle 21 can be pulled forward to remove the operating handle 21. When starting manual operation next time, the inner connecting sleeve 211 of the operating handle 21 needs to be plugged into the operating shaft 22. During the plugging, the limiting column 65 can be pressed down to below the limiting portion 2143 below the limiting sleeve 214 on the operating handle 21, and the operating handle 21 can be continued to be rotated. As the operating handle 21 drives the operating shaft 22 to rotate, the convex tooth 621 on the first connecting rod 62 is separated from the limiting groove 611 on the limiting wheel 61. Under the thrust of the limiting wheel 61, the first connecting rod 62 drops to below the limiting sleeve 214. At the same time, the second connecting rod 63 and the third connecting rod 64 drop accordingly. The left end of the third connecting rod 64 drops to the front side of the limiting step surface 2142 on the limiting sleeve 214, which can prevent the operating handle from being pulled out. Through the above arrangement, the operator can judge whether the operating shaft is rotated in place during manual operation, and can also prevent the operating handle from being pulled out midway, so that the three-position switch can only be in one of the three states: closed, open or grounded.

[0044] The middle mounting plate 12 is also provided with a first limiting seat 122, and a limiting hole is provided on the first limiting seat 122, and the left end of the first connecting rod 62 passes through the limiting hole. The front mounting plate 13 is provided with a second limiting seat 131, and the second limiting seat 131 is arranged on the left side of the third connecting rod 64. A limiting hole is provided on the second limiting seat 131, and the third connecting rod 64 passes through the limiting hole and extends to the side of the limiting sleeve 214. By providing the first limiting seat 122 and the second limiting seat 131, the up and down movable ranges of the first connecting rod 62 and the third connecting rod 64 can be limited to prevent the movable distance from being too large and causing a malfunction.

[0045] A first micro switch 123 is also provided on the middle mounting plate 12. The first micro switch 123 is arranged below the first connecting rod 62. When the convex tooth 621 on the first connecting rod 62 is separated from the limiting groove 611 on the limiting plate 61, the lower end surface of the first connecting rod 62 pushes onto the first micro switch 123. When the convex tooth 621 on the first connecting rod 62 is combined with the limiting groove 611 on the limiting plate 61, the lower end surface of the first connecting rod 62 is separated from the first micro switch 123. By setting the first micro switch 123, the state of the three-position switch can be detected. When the three-position switch is in any of the three states of closing, opening or grounding, the convex tooth 621 on the first connecting rod 62 is opposite to the limiting groove 611 on the limiting plate 61, and the first connecting rod 62 will rise under the action of the tension spring 66, so that the lower end surface of the first connecting rod 62 is separated from the first micro switch 123, triggering the first micro switch, and sending a signal to the control device of the three-position switch. When the three-position switch is operated electrically, the motor can be controlled to stop rotating.

[0046] The sensor assembly 5 includes a turntable 51, a micro-pressing block 52 and a micro-switch 53. The turntable 51 is fixedly connected to the positioning shaft 4 and is located at the front side of the front mounting plate 13. The micro-pressing block 52 includes three micro-pressing blocks 52 and is fixedly arranged on the turntable 51 at a certain circumferential spacing. The micro-switch 53 includes three micro-pressing blocks 52 and is arranged on the front mounting plate 13 at a circumferential spacing corresponding to the micro-pressing blocks 52. The three micro-switches 53 correspond to the three micro-pressing blocks 52 one by one. By setting the sensor assembly, the rotation angle of the positioning shaft can be determined. When the micro-pressing block 52 rotates to the corresponding position of the micro-switch 53, the micro-switch is triggered, and at this time, it is in the state of closing, opening or grounding. The micro-switch can send a corresponding signal to the control device of the three-position switch to feedback the current state of the three-position switch. When the three-position switch is operated electrically, the motor can be controlled to stop rotating.

[0047] A front protective cover 15 is also provided on the front mounting plate 13, and the front protective cover 15 is fixedly connected to the front mounting plate 13. An operating door 151 is provided at a position corresponding to the operating shaft 22 on the front protective cover 15, and the operating door 151 is movably connected to the front protective cover 15. An operating door mounting seat 132 is provided on the front mounting plate 13, and a second micro switch 133 is provided on the operating door mounting seat 132. The upper end of the operating door 151 is movably connected to the operating door mounting seat 132 through an upper connecting plate 152. When the operating door 151 is opened, the upper connecting plate 152 presses on the second micro switch 132, and a lower connecting plate 153 is provided at the lower end of the operating door 151. A guide connecting plate 134 is provided on the front mounting plate 13, and a mounting hole is provided on the front mounting plate 13. The rear end of the guide connecting plate 134 passes through the mounting hole, and a limiting portion is provided at the rear end of the mounting hole. A compression spring 135 is provided on the guide connecting plate 134, and the lower connecting plate 153 is movably connected to the front end of the guide connecting plate 134. By setting the front protective cover 15, the front side components of the three-position linear operating mechanism can be protected. By setting the operating door 151, it is convenient to open the operating door 151 and plug the operating handle 21 to perform manual operation. When the operating door 151 is opened, the upper connecting plate 152 at the upper end of the operating door 151 presses on the second micro switch 133, triggering the second micro switch 133. The second micro switch 133 can send a corresponding signal to the control device of the three-position switch to feedback the current status.

[0048] The three-position linear operating mechanism of the present invention can be used to operate the three-position switch manually or electrically. When manually operated, the operating door on the front protective cover is first opened. When the upper connecting plate on the operating door rotates, it hits the second micro switch, triggers the second micro switch, and sends a corresponding signal to prompt the control device of the three-position switch that the operating door has been opened and manual operation can be performed. Then, the operating handle is plugged into the front end of the operating shaft. When plugging, the inner hole of the inner connecting sleeve is aligned with the operating shaft, and pushed backward to plug the operating handle with the operating shaft. When plugging, the limit sleeve can be rotated to the right side of the limit column on the first connecting rod. After the plugging is completed, the operating shaft can be driven to rotate by rotating the operating handle. When the operating shaft rotates, the clutch assembly is in a separated state, and the power will not be transmitted to the motor, so the power can be directly transmitted to the transmission assembly at the rear end of the operating shaft. The power is transmitted to the worm of the worm gear mechanism through the bevel gear set, and then the worm gear is driven to rotate by the worm, and the worm gear is fixedly connected to the positioning shaft, so that the positioning shaft can be driven to rotate. When the positioning shaft rotates, the limit plate fixedly connected to the positioning shaft rotates accordingly. As the limit plate rotates, the limit groove on the limit plate separates from the convex tooth on the first connecting rod of the limit assembly, and the limit plate presses the first connecting rod downward to make the first connecting rod rotate downward, and the limit column drops to the bottom of the limit sleeve. At the same time, the second connecting rod and the third connecting rod move downward synchronously, and the left end of the third connecting rod drops to the front side of the limit step surface on the limit sleeve, forming a limit on the limit sleeve, thereby limiting the operating handle from being pulled out midway. When it is rotated to close, open or connect the switch When the lever is in one of the three working positions, the convex tooth on the first connecting rod is just opposite to the limiting groove on the limiting plate. Under the action of the tension spring, the first connecting rod rotates upward to combine the convex tooth with the limiting groove. At the same time, the limiting column on the first connecting rod rises to the right side of the limiting portion of the limiting sleeve, forming a limit on the operating handle and blocking the continued rotation of the operating handle. The second connecting rod and the third connecting rod rise, and the left end of the third connecting rod is away from the limiting sleeve, releasing the limit on the limiting sleeve. At this time, the operating handle can be pulled out to complete one operation of the three-position linear operating mechanism. When the three-position linear operating mechanism needs to be operated electrically, it is only necessary to turn on the motor switch, and the motor starts to rotate. The motor drives the driven gear to rotate through the gear transmission mechanism. When the driven gear rotates, the steel ball is pushed out, pushing the first clutch wheel forward for axial movement. The convex teeth on the first clutch wheel are combined with the grooves on the second clutch wheel, so that the first clutch wheel can transmit power to the second clutch wheel, driving the second clutch wheel to rotate, and then driving the operating shaft to rotate. As the operating shaft rotates, the operation of the three-position linear operating mechanism can be completed in the same way as the above process. In the above process, when the convex teeth on the first connecting rod are combined with the limiting grooves on the limiting disk, the micro-motion pressure block on the rotating disk set on the positioning shaft just combines with the micro-motion switch, triggering the micro-motion switch. The micro-motion switch sends a corresponding feedback signal to the control device of the three-position switch, which can control the motor to stop rotating.At the same time, as the first connecting rod rises, the lower end surface of the first connecting rod separates from the second micro switch, and the second micro switch also sends a corresponding feedback signal to indicate the current state of the three-position switch, and can also control the motor to stop rotating. The two signals can also be used together as a trigger signal for the motor to stop rotating. Compared with the existing three-position linear operating mechanism using energy storage springs, the three-position linear operating mechanism of the present invention has a greatly simplified structure, a greatly reduced number of parts of the three-position linear operating mechanism, and avoids the use of large torque torsion springs, making assembly and manufacturing easier; the three-position linear operating mechanism of the present invention is easier to operate, with only one operating shaft. During operation, it is only necessary to rotate the operating shaft to perform corresponding operations on the three-position switch, and no misoperation will occur, and the failure rate is greatly reduced; the three-position linear operating mechanism of the present invention does not need to design a complex interlocking mechanism, the structure is greatly simplified, the failure rate is very low, and the safety is high; the three-position linear operating mechanism of the present invention can design an electric drive assembly on the operating shaft to realize the automatic operation of the three-position linear operating mechanism, improve the accuracy and efficiency of the operation, and save labor.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-station linear operating mechanism, characterized in that: It includes a rear assembly plate, a middle installation plate, a front installation plate, an operating shaft assembly, a transmission assembly, a positioning shaft, a sensor assembly and a limit assembly. The operating shaft assembly and the positioning shaft pass through the front installation plate, the middle installation plate and the rear assembly plate in sequence from front to back. The rear end of the operating shaft assembly is connected to the power input end of the transmission assembly, and the power output end of the transmission assembly is connected to the positioning shaft. The sensor assembly is arranged on the front installation plate and is located near the front end of the positioning shaft. The limit assembly is arranged between the front installation plate and the middle installation plate, and the limit assembly is respectively matched with the operating shaft assembly and the positioning shaft. The operating shaft assembly comprises an operating handle and an operating shaft, wherein the operating shaft is rotatably connected to the front mounting plate, the middle mounting plate and the rear mounting plate through bearings, and the operating handle is connected to the front end of the operating shaft; The operating handle comprises an inner connecting sleeve, a connecting rod shaft and a handle, the rear side portion of the inner connecting sleeve is sleeved with the front end of the operating shaft, a rotation limiting portion cooperating with the operating shaft is provided on the rear side portion of the inner connecting sleeve, the front side portion of the inner connecting sleeve is sleeved with the connecting rod shaft, and a rotation limiting portion cooperating with the connecting rod shaft is provided on the front side portion of the inner connecting sleeve, the handle is fixedly connected to the front end portion of the connecting rod shaft; a limiting sleeve is also sleeved on the inner connecting sleeve, the limiting sleeve is fixedly connected to the inner connecting sleeve, the rear side end of the connecting rod shaft passes through the limiting sleeve and extends into the inner connecting sleeve, a limiting pin is provided on the connecting rod shaft, the limiting pin is arranged along the radial direction of the connecting rod shaft, a limiting groove is provided on the limiting sleeve, two ends of the limiting pin extend into the limiting grooves on the limiting sleeve, a compression spring is provided on the connecting rod shaft, the rear side end of the compression spring is pressed against the front side end face of the limiting sleeve, and the front side end face of the compression spring is pressed against the limiting ring on the handle; The sensor assembly includes a rotating disk, a micro-pressure block and a micro-switch. The rotating disk is fixedly connected to the positioning shaft and is located on the front side of the front mounting plate. The micro-pressure blocks include three and are fixedly arranged on the rotating disk with a certain circumferential spacing. The micro-switches include three and are arranged on the front mounting plate with a circumferential spacing corresponding to the micro-pressure blocks. The three micro-switches correspond to the three micro-pressure blocks one by one. The limit assembly comprises a limit plate, a first connecting rod, a second connecting rod, a third connecting rod, a limit column and a tension spring, the limit plate is fixedly connected to the positioning shaft and is located between the front mounting plate and the middle mounting plate, an arc-shaped limit groove is provided on the limit plate, a limit rod is provided on the middle mounting plate, the front side end of the limit rod is located in the arc-shaped limit groove, and the rotation angle of the limit plate can be limited by the limit rod, thereby limiting the rotation angle of the positioning shaft; three limit grooves are provided on the outer circumferential surface of the limit plate, the right end of the first connecting rod is connected to the middle mounting plate through a connecting column, the first connecting rod and the connecting column are rotatably matched, the first connecting rod is arranged below the limit plate, a convex tooth is provided on the first connecting rod, the shape of the convex tooth matches the shape of the limit groove on the limit plate, when the limit groove on the limit plate rotates to the convex tooth, the first connecting rod rotates upward, and the convex tooth can be combined with the limit groove on the limit plate; the limit column is arranged on the left side of the first connecting rod The locking plate is connected to the locking plate by the locking cam, and the locking cam is connected to the locking plate by the locking cam, so that the locking cam can be locked to the locking plate when the locking cam is locked.

2. The three-position linear operating mechanism according to claim 1, characterized in that: The invention also includes an electric drive assembly and a clutch assembly. The electric drive assembly includes a motor and a gear set. The output shaft of the motor is fixedly connected to the driving gear, the driving gear is meshed with the driven gear, the driven gear is arranged on the operating shaft, and the driven gear rotates with the operating shaft. A spacer sleeve for axially limiting the driven gear is provided on the operating shaft. The clutch assembly includes a first clutch wheel and a second clutch wheel. The first clutch wheel is arranged on the operating shaft and located at the front side of the driven gear. The first clutch wheel rotates with the operating shaft. The second clutch wheel is arranged on the operating shaft and located at the front side of the first clutch wheel. The second clutch wheel is fixedly connected to the operating shaft. A plurality of spherical grooves are provided on one side of the driven gear facing the first clutch wheel. Steel balls are arranged in the grooves, a spherical groove corresponding to the steel ball is arranged on the side surface of the first clutch wheel facing the driven gear, a convex tooth is arranged on the side surface of the first clutch wheel facing the second clutch wheel, and a groove is arranged on the side surface of the second clutch wheel facing the first clutch wheel, the convex teeth on the first clutch wheel match the shape and position of the groove on the second clutch wheel, the first clutch wheel can slide axially on the operating shaft, slide toward the front side so that the convex teeth on the first clutch wheel are combined with the groove on the second clutch wheel, or slide toward the rear side so that the convex teeth on the first clutch wheel are separated from the groove on the second clutch wheel, when the convex teeth on the first clutch wheel are combined with the groove on the second clutch wheel, the steel ball is still partially located in the spherical groove on the first clutch wheel.

3. The three-station linear operating mechanism according to claim 1, characterized in that: The transmission assembly includes a bevel gear transmission mechanism and a worm gear transmission mechanism. A bearing seat is provided between the middle mounting plate and the rear assembly plate, and a bearing is provided on the bearing seat. The worm gear mechanism includes a meshing worm wheel and a worm. The worm is arranged on the bearing seat, and the worm wheel is fixedly connected to the positioning shaft. The driving bevel gear of the bevel gear transmission mechanism is arranged on the rear side of the operating shaft, and the driven bevel gear is arranged at the end of the worm.

4. The three-position linear operating mechanism according to claim 1, characterized in that: A first micro switch is provided on the middle mounting plate, and the first micro switch is arranged below the first connecting rod. When the convex tooth on the first connecting rod is separated from the limiting groove on the limiting plate, the lower end surface of the first connecting rod pushes against the first micro switch. When the convex tooth on the first connecting rod is combined with the limiting groove on the limiting plate, the lower end surface of the first connecting rod is separated from the micro switch.

5. The three-station linear operating mechanism according to claim 1, characterized in that: The middle mounting plate is provided with a first limit seat, the first limit seat is provided with a limit hole, the left end of the first connecting rod passes through the limit hole, the front mounting plate is provided with a second limit seat, the second limit seat is arranged on the left side of the third connecting rod, the second limit seat is provided with a limit hole, the third connecting rod passes through the limit hole and extends to the side of the limit sleeve.

6. The three-station linear operating mechanism according to claim 1, characterized in that: The front mounting plate is also provided with a front protective cover, which is fixedly connected to the front mounting plate, an operating door is provided at a position of the front protective cover corresponding to the operating shaft, the operating door is movably connected to the front protective cover, an operating door mounting seat is provided on the front mounting plate, a second micro switch is provided on the operating door mounting seat, the upper end of the operating door is movably connected to the operating door mounting seat through an upper connecting plate, when the operating door is opened, the upper connecting plate is pressed against the second micro switch, a lower connecting plate is provided at the lower end of the operating door, a guide connecting plate is provided on the front mounting plate, a mounting hole is provided on the front mounting plate, the rear end of the guide connecting plate passes through the mounting hole, and a limiting portion is provided at the rear end of the mounting hole, a compression spring is provided on the guide connecting plate, and the lower connecting plate is movably connected to the front end of the guide connecting plate.

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