Incomplete tooth transmission gear and transmission structure

Abstract

The present invention discloses an incomplete tooth transmission gear and a transmission structure, and belongs to the technical field of switch cabinets. The present invention provides an incomplete tooth transmission gear, characterized in that the gear teeth on the periphery of the incomplete tooth transmission gear are not completely continuous, so that the periphery of the transmission gear includes a notch, and the side of the notch is provided with a gear limit plate. The present invention also provides an incomplete tooth transmission structure, including an incomplete tooth transmission gear, and a driven rack plate or a driven gear meshing with the incomplete tooth transmission gear. The incomplete tooth transmission structure provided by the present invention can realize intermittent transmission with the notch during forward transmission and reverse transmission, and no axial offset occurs during reverse transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinets, and in particular relates to a novel incomplete tooth transmission gear and a transmission structure. Background Art

[0002] An incomplete gear is an intermittent motion mechanism, and its basic structural forms are divided into two types: external meshing and internal meshing. In a transmission mechanism that uses an incomplete gear as the driving wheel, the teeth on the driving wheel are incomplete, usually with only one or a few teeth, and the rest are locking arcs. According to the requirements of the movement time and the rest time, normal teeth and locking arcs that mesh with the driving wheel are made on the driven wheel. When the toothed part of the driving wheel meshes with the teeth of the driven wheel, the driven wheel is driven to rotate; when the driving wheel rotates continuously, the toothed part of the driving wheel disengages from the driven wheel, and the driven wheel stops. When stopped, the locking arc on the driven wheel is tightly fitted with the locking arc on the driving wheel, ensuring that the driven wheel stops at a certain position without wandering. Therefore, when the driving wheel rotates continuously, the driven wheel obtains intermittent motion that moves and stops.

[0003] The Chinese patent application with application number 201310058847.0 discloses a toothless power switching mechanism for manual and electric automatic switching of electric actuators, which includes: an output gear meshing with an electric input gear for driving the output end of the actuator; a missing angle gear installed in a meshing position with the output gear for connecting a crank or a hand wheel, with a missing angle of its outer circle lacking a number of gear teeth; when the gear teeth of the missing angle gear mesh with the gear teeth of the output gear, it is in a manual output state; when the missing angle of the missing angle gear is close to the gear teeth of the output gear, it is in an electric output state. In the patent application document, the missing tooth gear meshes with another gear.

[0004] The Chinese patent application with application number 90224947.9 discloses a ratchet type automobile brake anti-theft lock, including a housing, a rack, a missing gear, a first torsion spring, a ratchet, a second torsion spring, a control pull rope, a sheath tube, a spring, a slider, a tongue, a lock tongue, a needle spring, a spring, a ratchet, etc. One end of the rack is connected and fixed to the brake pedal push rod by a bolt, and the other end is connected to the piston push rod of the brake hydraulic pump or becomes an integral whole. The missing gear is fixed on the A axis and can rotate around the A axis and mesh with the rack. The ratchet and the second torsion spring are fixed. On the B axis, and can rotate around the B axis, the pawl contacts the cam on the missing gear, the control rope is fixed on the fan of the missing gear, and passes through the sheath tube to be fixedly connected to the slider, the tongue is stuck in the groove of the slider, the needle spring bounces the tongue, the slider can move flexibly in the ignition lock, and compresses the spring, the pawl can go around the C axis and be fixed on the C axis, and contact the cylindrical surface of the missing gear, the A, B, and C axes are fixed in the housing, the rack part, the missing gear, the pawl, etc. are all in the housing, and are linked to the slider in the ignition lock through the drawn control rope. The missing gear in the patent application document is meshed with a rack.

[0005] PCT application No. 200980124960.6 discloses a disk device, which switches a power transmission system from a driving source to transport disks and transport a pickup, and is characterized in that it includes: a rack extending along the moving direction of the pickup and being integrated with the pickup; a first toothless gear having a cam groove and engaging and disengaging with a gear of the power transmission system; a second toothless gear having a hole corresponding to the cam groove, overlappingly arranged on the first toothless gear and being supported by an axis so as to be relatively rotatable relative to the first toothless gear, and engaging and disengaging with a gear of the power transmission system; a rotating rod, at one end of which has a locking portion on the rack abutting against the locking portion and pressing in the moving direction of the pickup. The engaging portion of the rack has a pin at the other end of the rotating rod that penetrates the hole and acts on the cam groove; a trigger member that works when the disk is inserted to rotate the first toothless gear, thereby engaging with a gear of the power transmission system; a working member that works under the rotational force of the first toothless gear to cut off the power transmission system for the roller that transports the disk; and a first force member that is provided between the rotating rod and the rack to move the rack by the engaging portion of the rotating rod that rotates with the rotation of the first toothless gear, thereby engaging the rack with another gear of the power transmission system, and releasing the engagement of the second toothless gear with a gear of the power transmission system by the pin. In the patent application document, two toothless gears are superimposed to engage with the other two gears respectively.

[0006] The incomplete tooth gear disclosed in the above application documents has the following problems:

[0007] Since the driven wheel is not completely at a constant speed during the entire movement process, the angular velocity changes suddenly at the beginning and end of each rotation, resulting in rigid impact. The teeth and locking arc on the driven wheel need to cooperate with the toothed part, toothless part and locking arc on the driving wheel, which makes its processing very complicated; and the driving and driven wheels cannot be interchanged.

[0008] In addition, when it is necessary to mesh with multiple transmission mechanisms at the same time, the structure of the incomplete tooth gear designed in the above manner will be very complicated.

[0009] In addition, when the transmission gear provided with the notch is used for transmission, axial displacement is likely to occur during reverse transmission. Summary of the invention

[0010] The object of the present invention is to provide an incomplete tooth transmission gear and transmission structure, which is suitable for realizing intermittent transmission with gaps during forward transmission and reverse transmission between multiple gears or racks at the same time, and no axial offset occurs during reverse transmission.

[0011] Specifically, the present invention is implemented by adopting the following technical solution: the gear teeth on the periphery of the incomplete tooth transmission gear are not completely continuous, so that the periphery of the transmission gear includes a notch, and a gear limiting plate is arranged on the side of the notch.

[0012] Furthermore, the gear teeth are arranged in one layer, and the notch is limited at both sides along the axial direction by gear limiting plates respectively.

[0013] Furthermore, the gear teeth include several layers, and the notch is limited on both sides along the axial direction by gear teeth and gear limiting plates respectively.

[0014] Furthermore, when the incomplete tooth transmission gear is used in a transmission design, it serves as an active transmission part, a passive transmission part or an intermediate transmission part.

[0015] On the other hand, an incomplete tooth transmission structure is provided, characterized in that it includes an incomplete tooth transmission gear and also includes a driven rack plate or a driven gear meshing with the incomplete tooth transmission gear for transmission, and the tooth layer on the incomplete tooth transmission gear meshing with the driven rack plate or the driven gear is provided with a partial notch, so that when the incomplete tooth transmission structure rotates a first angle, the driven rack plate or the driven gear moves, and when the incomplete tooth transmission structure continues to rotate a second angle, the driven rack plate or the driven gear remains stationary.

[0016] Furthermore, the incomplete tooth transmission gear is provided with more than two tooth layers.

[0017] Furthermore, when the incomplete tooth transmission gear is used as the first driven gear, it includes a tooth layer for meshing with the active rack plate or the active gear and a tooth layer for meshing with the second driven rack plate or the second driven gear. The tooth layer on the first driven gear that meshes with the second driven rack plate or the second driven gear is provided with a partial notch, so that when the active rack plate or the active gear drives the first driven gear to rotate a first angle, the second driven rack plate or the second driven gear moves, and when the active rack plate or the active gear drives the first driven gear to continue to rotate a second angle, the second driven rack plate or the second driven gear remains stationary.

[0018] The beneficial effects of the present invention are as follows: the incomplete gear and transmission structure of the present invention can realize forward transmission and reverse transmission, the first transmission structure matched with the missing teeth of the incomplete gear does not move, and the second transmission structure meshed with the toothed part of the incomplete gear moves. When the incomplete gear continues to rotate until the missing teeth part is matched with the second transmission mechanism, the second transmission structure does not move, and the first transmission mechanism moves; and the technical problem that the transmission gear with a notch is prone to axial displacement during reverse transmission is overcome. Due to the use of a gear limit plate, the transmission gear with a notch can smoothly mesh and transmit during reverse transmission. Due to the use of a multi-layer tooth structure, it can be matched with multiple transmission structures for transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present invention.

[0020] Figure 2 It is an enlarged schematic diagram of the control mechanism of Example 1 of the present invention.

[0021] Figure 3 It is an enlarged schematic diagram of the transmission mechanism A of Example 1 of the present invention.

[0022] Figure 4 It is a front view of the transmission gear of embodiment 1 of the present invention.

[0023] Figure 5 It is a side view of the transmission gear of embodiment 1 of the present invention.

[0024] Figure 6 It is a rear view of the transmission gear of embodiment 1 of the present invention.

[0025] Figure 7 yes Figure 5 Sectional view of the middle transmission gear on plane AA.

[0026] Figure 8 yes Figure 5 Cross-sectional view of the middle transmission gear BB surface.

[0027] Fig. 9 It is a stereoscopic diagram of the transmission gear in Example 1 of the present invention.

[0028] Fig.10 It is a schematic diagram of the overall structure of Example 2 of the present invention viewed from the inside to the outside.

[0029] Fig.11 It is a schematic diagram of the overall structure of Example 2 of the present invention viewed from the outside to the inside.

[0030] Fig.12 It is an enlarged schematic diagram of the left propulsion mechanism of Example 2 of the present invention.

[0031] Fig.13 It is an enlarged schematic diagram of the right propulsion mechanism of Example 2 of the present invention.

[0032] Numbers in the figure: 1-work position indication window, 2-protrusion, 3-working position contact, 4-test position contact, 5-gear limit plate, 6-control mechanism, 61-fixed base, 62-right rack plate, 63-left rack plate, 64-driven bevel gear, 65-driving bevel gear, 66-locking hole panel, 67-gear shaft, 68-marking plate driving wheel, 69-work position marking plate, 7-transmission mechanism A, 71-test position rack plate, 72-transmission gear, 73-working position rack plate, 711-test position push plate, 731-working position push plate, 70-transmission mechanism B, 720-left transmission gear, 721-right transmission gear, 712-test position gear, 713-test position push block. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in combination with embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention.

[0034] The drawers of low-voltage switch cabinets are divided into two types of wiring according to different voltages and functions, one for connecting high-voltage lines and the other for connecting control lines. The drawers have the following three working states:

[0035] State 1 is called the disconnected position, at which time both the primary and secondary incoming lines are not connected.

[0036] State 2 is called the test position, in which the primary incoming line is not connected and the secondary incoming line is connected.

[0037] State 3, called the working position, is when both the primary and secondary incoming lines are connected.

[0038] Embodiment 1:

[0039] One embodiment of the present invention is a drawer alternately advancing mechanism. Figure 1 The drawer alternating advancement mechanism mainly includes a control mechanism 6 and a transmission mechanism A 7.

[0040] Reference Figure 2The control mechanism 6 includes a fixed base 61, a right rack plate 62, a left rack plate 63, a driven bevel gear 64, a driving bevel gear 65, a lock hole panel 66, a gear shaft 67, a marking plate driving wheel 68 and a station marking plate 69. The gear shaft 67 is arranged horizontally, and a driving bevel gear 65 is arranged at the inner end. The driving bevel gear 65 meshes with the upper gear teeth of the driven bevel gear 64 with a vertical central axis. The right rack plate 62 and the left rack plate 63 are distributed on both sides of the driven bevel gear 64, and mesh with the lower gear teeth of the driven bevel gear 64 respectively. When the gear shaft 67 rotates, the right rack plate 62 and the left rack plate 63 can be driven to move to both sides at the same time. In this embodiment, only bevel gears are used as an example, but it is not limited to bevel gears, and other types of gears can also be used. The gear structure used can be used as long as it can achieve the above functions.

[0041] The fixed base 61 is fixed to the bottom plate of the drawer by rivets, and limits the left rack plate 63 and the right rack plate 62. The driven bevel gear 64 is fixed to the fixed base 61.

[0042] The control mechanism 6 is provided with a lock hole, and the insertion of an operating member (such as a key) can drive the active bevel gear 65 to move the left and right rack plates to the left and right sides respectively, and then transmit the movement to the contact through the transmission mechanism A7 to achieve circuit connection and disconnection control.

[0043] The transmission mechanism A7 includes the propulsion structures on the left and right sides of the drawer. Since the propulsion mechanisms on both sides of the drawer have the same structure, the right side is taken as an example for structural description. The left side and the right side mentioned in this embodiment refer to the left side and the right side when looking from the outside to the inside of the drawer. Figure 3 The right propulsion mechanism includes a test position rack plate 71, a working position rack plate 73 and a transmission gear 72. Among them, the right rack plate 62, the test position rack plate 71 and the working position rack plate 73 are all meshed with the transmission gear 72. The structure of the transmission gear 72 is shown in FIG. Figures 4 to 9 , multiple layers of teeth are arranged on the transmission gear 72, including a layer where teeth meshing with the test position rack plate 71 are located, a layer where teeth meshing with the working position rack plate 73 are located, and a layer where teeth meshing with the right rack plate 62 are located. The layer where teeth meshing with the test position rack plate 71 on the transmission gear 72 and the layer where teeth meshing with the working position rack plate 73 on the transmission gear 72 both have partial notches, so that when the operating member rotates a certain angle (for example, 90 degrees), the test position rack plate 71 moves while the working position rack plate 73 does not move; when the operating member continues to rotate a certain angle (for example, 180 degrees), the working position rack plate 73 moves while the test position rack plate 71 does not move. When the transmission gear 72 with notches is used for transmission, the gear is prone to offset during reverse transmission. In this embodiment, a gear limit plate 5 (see Fig. 9) solves this problem. After the gear limit plate 5 is set, the notch on the transmission gear 72 is limited by the gear teeth and the gear limit plate 5 on both sides of the axial direction. The transmission gear 72 that meshes with the test position rack plate 71, the working position rack plate 73, and the right rack plate 62 respectively is not limited to the above-mentioned three-layer structure as exemplified in this embodiment. The transmission gear 72 at least includes three layers of gear teeth that mesh with the test position rack plate 71, the working position rack plate 73, and the right rack plate 62 respectively; the test position rack plate 71, the working position rack plate 73, and the right rack plate 62 are also not limited to forming meshing levels in the above order, as long as it is ensured that the test position rack plate 71, the working position rack plate 73, and the right rack plate 62 are respectively meshed with different levels on the transmission gear 72 However, at this time, the arrangement of the gear teeth on each layer of the transmission gear 72 still needs to ensure that when the operating member rotates a certain angle (for example, 90 degrees) to drive the right rack plate 62 to move a certain distance, the test position rack plate 71 moves while the working position rack plate 73 does not move, and when the operating member continues to rotate a certain angle (for example, 180 degrees) to drive the right rack plate 62 to continue to move a certain distance, the working position rack plate 73 moves while the test position rack plate 71 does not move; the above rotation angle is only an example of this embodiment, and different rotation angles can be set as needed. It can be understood that the incomplete tooth transmission gear designed with the same principle as the transmission gear 72 can also be used as an active transmission part, a driven transmission part or an intermediate transmission part. The parts meshing with the incomplete tooth transmission gear are not limited to gears or racks.

[0044] like Figure 1 As shown, the test position rack plate 71 is fixedly connected to the test position push plate 711, the test position push plate 711 is fixedly connected to the test position contact 4, the working position rack plate 73 is fixedly connected to the working position push plate 731, and the working position push plate 731 is fixedly connected to the working position contact 3. When the test position rack plate 71 moves, the test position push plate 711 is driven to move, thereby pushing the test position contact 4 to move, and an electrical connection is established between the test position contact 4 and the test position socket (not shown in the figure), and the test position is reached. When the working position rack plate 73 moves, the working position push plate 731 moves, thereby pushing the working position contact 3 to move, and an electrical connection is established between the working position contact 3 and the working position socket (not shown in the figure), and the working position is reached.

[0045] When the drawer is in the working position, if the operating member is rotated in the reverse direction by a certain angle (for example, 180 degrees), the working position rack plate 73 moves in the reverse direction while the test position rack plate 71 does not move, the working position push plate 731 pulls the working position contact 3 to move in the reverse direction and leaves the working position socket (not shown in the figure), the working position contact 3 is disconnected from the working position socket (not shown in the figure), and the test position is reached. If the operating member is further rotated in the reverse direction by a certain angle (for example, 90 degrees), the test position rack plate 71 moves in the reverse direction while the working position rack plate 73 does not move, the test position push plate 711 pulls the test position contact 4 to move in the reverse direction and leaves the test position socket (not shown in the figure), the test position contact 4 is disconnected from the test position socket (not shown in the figure), and the disconnected position is reached. Thus, the control between the disconnected position, the test position and the working position is realized by using one operating tool through the rotation of the control mechanism.

[0046] In summary, during the entire operation, the drawer (i.e., the equipment carrier) does not need to move. As long as the gear shaft is rotated through the control mechanism, the movement of the test contact and the working contact can be realized to achieve the purpose of point contact, which is more labor-saving, efficient, and safer.

[0047] The lock hole panel 66 is also provided with a workstation indication window 1 for indicating the current working status of the drawer. Figure 1 and Figure 2 , a marking plate driving wheel 68 is arranged on the gear shaft 67, and the distance between the outer wall of the marking plate driving wheel 68 and the axis of the gear shaft 67 gradually increases. The keyhole panel 66 is also provided with an inner panel shell, and a slide rail is arranged in the inner panel shell, and a station marking plate 69 is slidably arranged in the slide rail. A protrusion 2 is arranged on the side of the station marking plate 69, and the protrusion 2 is overlapped on the outermost outer wall of the marking plate driving wheel 68. Marks indicating different colors and / or different working states are attached to the front of the station marking plate 69 in sequence, and a lamp is installed behind the station marking plate 69 to illuminate and display these marks.

[0048] When the gear shaft 67 drives the marking plate driving wheel 68 to rotate synchronously, the marking plate driving wheel 68 will drive the protrusion 2 on the side of the station marking plate 69 to drive the station marking plate 69 to move up and down. Specifically, insert and turn the key, the station marking plate 69 is pushed upward by the marking plate driving wheel 68, and when the key is turned 90 degrees, the drawer reaches the test position, and the mark on the station marking plate 69 representing the test position is located in the station indication window 1. When the key continues to turn, the station marking plate 69 is pushed upward by the marking plate driving wheel 68, and when the accumulated key rotation angle reaches 270 degrees, the drawer reaches the working position, and the mark on the station marking plate 69 representing the working position is located in the station indication window 1. When the key is turned 180 degrees in the opposite direction, the station marking plate 69 drops due to gravity, and the mark on the station marking plate 69 representing the test position is located in the station indication window 1. When the key continues to turn 90 degrees, the station marking plate 69 drops due to gravity, and the mark on the station marking plate 69 representing the disconnection position is located in the station indication window 1. The rotation angle here is only an example of this embodiment. Different rotation angles can be set according to the above needs and the marking position indicating the working status on the work station marking plate 69 can be set accordingly.

[0049] Due to the use of indicator lights and markings of different colors and / or texts, the various working states of the drawer can be clearly seen in the work station indication window.

[0050] Embodiment 2:

[0051] Another embodiment of the present invention has a working principle that is basically the same as that of embodiment 1 and has a control mechanism that is basically the same as that of embodiment 1, and the main difference is the way the transmission mechanism moves.

[0052] Reference Fig.10 The transmission mechanism B 70 used in this embodiment includes a propulsion structure on the left and right sides of the drawer. In this embodiment, the propulsion mechanism structures on the two sides of the drawer are different. The left side and the right side mentioned in this embodiment refer to the left side and the right side when looking from the outside to the inside of the drawer.

[0053] Structural reference of the left propulsion mechanism Fig.10 (Viewed from the inside of the drawer, excluding the plug), Fig.11 (viewed from the outside of the drawer, including the plug) and Fig.12The left propulsion mechanism mainly includes a left rack plate 63, a working position rack plate 73 and a left transmission gear 720. Among them, the left rack plate 63 and the working position rack plate 73 are both meshed with the left transmission gear 720. Two layers of teeth are arranged on the left transmission gear 720, the working position rack plate 73 is meshed with the lower layer of the left transmission gear 720, and the left rack plate 63 is meshed with the upper layer of the left transmission gear 720. The layer where the teeth of the left transmission gear 720 and the working position rack plate 73 are meshed is partially notched, so that when the operating member rotates a certain angle (for example, 90 degrees), the test position gear 712 moves while the working position rack plate 73 does not move; when the operating member continues to rotate a certain angle (for example, 180 degrees), the working position rack plate 73 moves while the test position gear 712 does not move. The left transmission gear 720 and the right transmission gear 721 in this embodiment are also provided with a gear limiting plate 5. The notched parts on the left transmission gear 720 and the right transmission gear 721 are limited by gear teeth and the gear limiting plate 5 on both sides along the axial direction. It should be noted that the left transmission gear 720 meshing with the left rack plate 63 and the working position rack plate 73 respectively is not limited to the above-mentioned two-layer structure as exemplified in the present embodiment, and the left transmission gear 720 at least includes two layers of gear teeth meshing with the left rack plate 63 and the working position rack plate 73 respectively; the left rack plate 63 and the working position rack plate 73 are also not limited to forming the meshing levels in the above-mentioned order, as long as the left rack plate 63 and the working position rack plate 73 are respectively meshed with the gear teeth of different layers on the left transmission gear 720. However, at this time, the setting of each layer of gear teeth on the left transmission gear 720 still needs to ensure that when the operating member rotates a certain angle (for example, 90 degrees), the test position gear 712 moves while the working position rack plate 73 does not move; when the operating member continues to rotate a certain angle (for example, 180 degrees), the working position rack plate 73 moves while the test position gear 712 does not move.

[0054] Structural reference of the right propulsion mechanism Fig.10 , Fig.11 and Fig.13The right side propulsion mechanism includes a right rack plate 62, a test position gear 712, a working position rack plate 73 and a right transmission gear 721. Among them, the right rack plate 62, the test position gear 712 and the working position rack plate 73 are all meshed with the right transmission gear 721. Two layers of teeth are arranged on the right transmission gear 721, the test position gear 712 and the working position rack plate 73 are respectively meshed with the upper layer of the right transmission gear 721, and the right rack plate 62 is meshed with the lower layer of the right transmission gear 721. The side of the test position propulsion block 713 is provided with latching teeth, and the test position gear 712 includes a lower gear tooth layer meshed with the right transmission gear 721 and an upper gear tooth layer meshed with the latching teeth on the side of the test position propulsion block 713. The layer where the teeth of the right transmission gear 721 meshing with the working position rack plate 73 are located has a partial gap, and the layer where the teeth of the test position gear 712 meshing with the right transmission gear 721 are located has a partial gap, so that when the operating part rotates a certain angle (for example 90 degrees), the test position gear 712 moves while the working position rack plate 73 does not move; when the operating part continues to rotate a certain angle (for example 180 degrees), the working position rack plate 73 moves while the test position gear 712 does not move. It should be noted that the right transmission gear 721 meshing with the right rack plate 62, the test position gear 712 and the working position rack plate 73 respectively is not limited to the above-mentioned two-layer structure exemplified in the present embodiment, and the right transmission gear 721 at least includes two layers of gear teeth meshing with the right rack plate 62, the test position gear 712 and the working position rack plate 73 respectively; the right rack plate 62, the test position gear 712 and the working position rack plate 73 are also not limited to forming the meshing levels in the above-mentioned order, as long as the right rack plate 62, the test position gear 712 and the working position rack plate 73 are respectively meshed with the gear teeth of different layers on the right transmission gear 721. However, at this time, the setting of each layer of gear teeth on the right transmission gear 721 still needs to ensure that when the operating member rotates a certain angle (for example, 90 degrees), the test position gear 712 moves while the working position rack plate 73 does not move, and when the operating member continues to rotate a certain angle (for example, 180 degrees), the working position rack plate 73 moves while the test position gear 712 does not move. The test position gear 712 meshing with the right transmission gear 721 and the test position push block 713 respectively is not limited to the above-mentioned two-layer structure as exemplified in the present embodiment. The test position gear 712 at least includes two layers of gear teeth meshing with the right transmission gear 721 and the test position push block 713 respectively. The right transmission gear 721 and the test position push block 713 are also not limited to forming meshing levels in the above-mentioned order. It is sufficient as long as the right transmission gear 721 and the test position push block 713 are respectively meshed with gear teeth of different layers on the test position gear 712. However, at this time, the setting of each layer of gear teeth on the test position gear 712 still needs to ensure that when the operating member rotates a certain angle (for example, 90 degrees), the test position gear 712 moves while the working position rack plate 73 does not move. When the operating member continues to rotate a certain angle (for example, 180 degrees), the working position rack plate 73 moves while the test position gear 712 does not move.Furthermore, the right transmission gear 721 meshing with the right rack plate 62, the test position gear 712 and the working position rack plate 73 respectively may also adopt the structure of the transmission gear 72 described in Example 1. At this time, the test position gear 712 meshing with the right transmission gear 721 needs to adopt full teeth in the tooth layer meshing with the right transmission gear 721. At this time, it can still be achieved that when the operating member rotates a certain angle (for example, 90 degrees), the test position gear 712 moves while the working position rack plate 73 does not move, and when the operating member continues to rotate a certain angle (for example, 180 degrees), the working position rack plate 73 moves while the test position gear 712 does not move.

[0055] The structure of the test bit push block 713 is shown in FIG. Fig.13 , the test position push block 713 is fixedly connected to the test position contact 4, the working position rack plate 73 is fixedly connected to the working position push plate 731, and the working position push plate is fixedly connected to the working position contact 3. When the test position gear 712 moves, the test position push block 713 is driven to move, thereby pushing the test position contact 4 to move, and an electrical connection is established between the test position contact 4 and the test position socket (not shown in the figure), and the test position is reached. When the working position rack plate 73 moves, the working position push plate 731 pushes the working position contact 3 to move, and an electrical connection is established between the working position contact 3 and the working position socket (not shown in the figure), and the working position is reached.

[0056] When the drawer is in the working position, if the operating member is rotated in the reverse direction by a certain angle (for example, 180 degrees), the working position rack plate 73 moves in the reverse direction while the test position gear 712 does not move, and the working position push plate 731 pulls the working position contact 3 to move in the reverse direction and leaves the working position socket (not shown in the figure), and the electrical connection between the working position contact 3 and the working position socket (not shown in the figure) is disconnected, reaching the test position. If the operating member is further rotated in the reverse direction by a certain angle (for example, 90 degrees), the test position gear 712 moves in the reverse direction to drive the test position push block 713 to move in the reverse direction while the working position rack plate 73 does not move, and the test position push block 713 pulls the test position contact 4 to move in the reverse direction and leaves the test position socket (not shown in the figure), and the electrical connection between the test position contact 4 and the test position socket (not shown in the figure) is disconnected, reaching the disconnected position. Thus, the control between the disconnected position, the test position and the working position is realized by using an operating tool through the rotation of the control mechanism.

[0057] It should be noted that the incomplete tooth transmission gear in the present invention can be provided with any number of layers as required, and the above embodiments are only described with two or three layers. The incomplete tooth transmission gear and transmission mechanism of the present invention and the incomplete tooth transmission gear or transmission mechanism designed with the same principle can be applied to other scenarios as required.

[0058] Although the present invention has been disclosed as above with preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the content defined by the claims of this application.

Claims

1. An incomplete tooth transmission structure, characterized in that: It includes a right rack plate, a test position gear, a working position rack plate and a right transmission gear; the right transmission gear and the test position gear adopt an incomplete tooth transmission gear; the incomplete tooth transmission gear includes two layers of gear teeth, one of which is not completely continuous, so that the periphery of the incomplete tooth transmission gear includes a notch, and the two sides of the notch along the axial direction are respectively limited by the gear teeth of the adjacent gear layers and the gear limiting plate; the gear limiting plate is arranged on the side of the notch along the axial direction; Among them, the right rack plate, the test position gear and the working position rack plate are all meshed with the right transmission gear; the test position gear and the working position rack plate are respectively meshed with the upper gear teeth of the right transmission gear, and the right rack plate is meshed with the lower gear teeth of the right transmission gear; There is a partial gap in the layer where the teeth of the right transmission gear meshing with the working position rack plate are located, and there is a partial gap in the layer where the teeth of the test position gear meshing with the right transmission gear are located, so that when the right rack plate drives the right transmission gear to rotate the first angle, the test position gear moves while the working position rack plate does not move, and when the right transmission gear continues to rotate the second angle, the working position rack plate moves while the test position gear does not move.

2. An incomplete tooth transmission structure, characterized in that: It includes a right rack plate, a test position rack plate, a working position rack plate and a transmission gear; the transmission gear adopts an incomplete tooth transmission gear, and the incomplete tooth transmission gear includes three layers of gear teeth, wherein the gear teeth of two layers are not completely continuous, so that the periphery of the incomplete tooth transmission gear includes a notch, and the two sides of the notch portion of each layer along the axial direction are respectively limited by the gear teeth of the adjacent tooth layer and the gear limiting plate; the gear limiting plate is arranged on the side of the notch portion along the axial direction; Among them, the right rack plate, the test position rack plate and the working position rack plate are all meshed with the transmission gear; one layer of the incompletely continuous gear teeth of the transmission gear is meshed with the test position rack plate for transmission, and another layer of the incompletely continuous gear teeth is meshed with the working position rack plate for transmission, so that when the right rack plate drives the transmission gear to rotate a first angle, the test position rack plate moves while the working position rack plate does not move, and when the transmission gear continues to rotate a second angle, the test position rack plate does not move while the working position rack plate moves.

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