Plug valve grinding device

Abstract

The invention discloses a plug valve grinding machining device which comprises a rack, a linear motor, a grinding mechanism, a driving assembly, a driven mechanism, a pushing mechanism and a fixing piece. The linear motor is arranged at the top of the rack, a grinding mechanism is arranged on an output shaft of the linear motor, and the linear motor can drive the grinding mechanism to ascend and descend. The driving assembly is connected to the rack in a liftable and sliding mode and connected with an output shaft of the linear motor. The driven mechanism is rotatably arranged on the rack, and lifting of the driving assembly can drive the driven mechanism to rotate in a one-way mode; the pushing mechanism is arranged on the rack in a sliding mode, and rotation of the driven mechanism can drive the pushing mechanism to do linear reciprocating motion. The fixing part is arranged on the machine frame in a sliding mode, two fixing stations are arranged on the fixing part, the fixing part is connected with the pushing mechanism, and the pushing mechanism can drive the two fixing stations of the fixing part to be switched under the grinding mechanism. According to the plug valve grinding machining device, the next plug valve can be automatically replaced to the grinding station after grinding is completed, and manpower is saved.

Description

Technical Field

[0001] This invention belongs to the field of plug valve processing technology, specifically, it relates to a plug valve grinding processing device. Background Technology

[0002] As a key fluid control component widely used in petroleum, chemical, and metallurgical industries, the sealing performance and service life of plug valves are closely related to the grinding precision of the valve core and seat. To ensure reliable operation of plug valves, high-precision grinding of their sealing surfaces is an essential process. Currently, various plug valve grinding devices have emerged in the industry, such as the plug valve grinding device disclosed in the utility model patent with patent number CN220348012U. This type of device grinds the plug valve to be ground by setting up a grinding mechanism, which to a certain extent meets the basic grinding requirements. However, in actual production, the aforementioned plug valve grinding device has significant operational limitations. Specifically, after each grinding operation of a plug valve, the operator must manually replace the old and new plug valves. This method of relying on manual movement of the grinding station to replace the plug valves not only increases the labor intensity of the operators but also results in poor continuity of the grinding process due to the intermittent nature of manual operation, severely restricting the improvement of production efficiency and making it difficult to meet the demands of modern industrial production for automated and efficient processing. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a rotary valve grinding processing device to solve the technical problem mentioned in the background art that the operator needs to manually replace the old and new rotary valves after grinding.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this invention includes: A rotary valve grinding and processing apparatus includes a frame, a linear motor, a grinding mechanism, a drive assembly, a driven mechanism, a pushing mechanism, and a fixing component; The linear motor is located on the top of the frame, and the grinding mechanism is provided on the output shaft of the linear motor. The linear motor can drive the grinding mechanism to rise and fall. The drive assembly is slidably connected to the frame and connected to the output shaft of the linear motor; the driven mechanism is rotatably mounted on the frame, and the lifting of the drive assembly can drive the driven mechanism to rotate in one direction. The pushing mechanism is slidably mounted on the frame, and the rotation of the driven mechanism can drive the pushing mechanism to perform linear reciprocating motion; the fixing member is slidably mounted on the frame, and the fixing member has two fixed positions. The fixing member is connected to the pushing mechanism, and the pushing mechanism can drive the two fixed positions of the fixing member to switch under the grinding mechanism.

[0005] Furthermore, the driving mechanism includes a worm, a worm gear assembly, and a moving component; the worm and the worm gear assembly are rotatably connected to the frame, the driven mechanism can drive the worm to rotate, and the worm can drive the worm gear assembly to rotate in one direction; the moving component is slidably connected to the frame and connected to the fixed component, and the rotation of the worm gear assembly can drive the moving component to reciprocate linearly.

[0006] Furthermore, the worm gear assembly includes a drive shaft, a worm gear body, and an incomplete gear; the drive shaft is rotatably connected to the frame, the worm gear body and the incomplete gear are coaxially fixed on the drive shaft, the worm can drive the worm gear body to rotate in one direction, and the incomplete gear can drive the moving component to move linearly back and forth.

[0007] Furthermore, the moving component includes a sliding internal gear ring and a push link; the sliding internal gear ring is an elongated gear ring with teeth on two opposing inner planes, which mesh with the incomplete gear; the sliding internal gear ring is slidably connected to the frame and connected to the fixing member through the push link.

[0008] Furthermore, the drive assembly includes a drive rack and a drive link; the drive rack is slidably connected to the frame and connected to the output shaft of the linear motor through the drive link, and the lifting of the drive rack can drive the driven mechanism to rotate in one direction.

[0009] Furthermore, the driven mechanism includes a driven gear ring, a one-way component, a pawl assembly, and a transmission belt; the driven gear ring is rotatably connected to the frame and can mesh with the rack, and the inner side of the driven gear ring is provided with a plurality of ratchet teeth; the one-way component is rotatably connected to the frame and coaxial with the driven gear ring, and is located inside the driven gear ring; the pawl assembly is rotatably disposed on the one-way component, and the lifting of the rack can unidirectionally drive the pawl assembly and the one-way component to rotate together through the ratchet teeth of the driven gear ring; the rotation of the one-way component can drive the pushing mechanism to slide through the transmission belt.

[0010] Furthermore, the one-way component includes a turntable and a one-way rotating shaft; the turntable is rotatably connected to the frame and coaxial with the driven gear ring, and located inside the driven gear ring; the pawl assembly is eccentrically rotatably connected to the turntable; the one-way rotating shaft is coaxially fixed to the turntable and drives the pushing mechanism to move through the transmission belt.

[0011] Furthermore, the pawl assembly includes a pawl body and a spring; the pawl body is eccentrically rotatably connected to the turntable and is connected to the turntable via the spring.

[0012] Furthermore, a limiting component is provided, which can limit the position of the fixing member by sliding. The limiting component includes a limiting seat, a limiting rod, a limiting connecting plate, a limiting spring, and a fixing plate. The limiting seat is fixed on the frame, and the limiting rod is slidably connected to the limiting seat. The fixing member is provided with a limiting groove, and the limiting rod can be inserted into the limiting groove to limit the sliding of the fixing member. The limiting connecting plate is fixed on the limiting rod and connected to the fixing plate through the limiting spring. The fixing plate is fixed on the frame. A cam is also provided on the pushing shaft near the end of the limiting rod. The limiting rod is provided with an inclined surface near the end of the cam. The rotation of the cam can squeeze the inclined surface of the limiting rod, so that the limiting rod is inserted into the limiting groove. When the incomplete gear rotates, it can simultaneously disengage from the meshing of the upper and lower sides of the sliding internal gear ring.

[0013] Compared with the prior art, the advantages of the present invention include: In this application, each lifting of the drive component drives the driven mechanism to rotate in one direction. The rotation of the driven mechanism drives the fixed part to slide back and forth through the push mechanism, so that the fixed station under the grinding mechanism switches back and forth. This realizes the automatic removal of the ground plug valve and the removal of the plug valve to be ground after each grinding, thus realizing the automation of loading and unloading. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an overall schematic diagram of a rotary valve grinding and processing device according to the present invention; Figure 2 This is a schematic diagram from another angle of the rotary valve grinding and processing device in this invention; Figure 3This is an enlarged schematic diagram of A in this invention.

[0016] Figure label: Frame 1, Linear Motor 2, Grinding Mechanism 3, Drive Assembly 4, Drive Rack 41, Drive Link 42, Driven Mechanism 5, Driven Gear Ring 51, One-Way Assembly 52, Turntable 521, One-Way Rotating Shaft 522, Pawl Assembly 53, Pawl Body 531, Spring 532, Transmission Belt 54, Push Mechanism 6, Worm 61, Worm Gear Assembly 62, Pushing Shaft 621, Worm Gear Body 622, Incomplete Gear 623, Cam 624, Moving Assembly 63, Sliding Internal Gear Ring 631, Push Link 632, Fixing Part 7, Limiting Groove 71, Limiting Assembly 8, Limiting Seat 81, Limiting Rod 82, Limiting Connecting Plate 83, Limiting Spring 84, Fixing Plate 85. Detailed Implementation

[0017] In view of the shortcomings of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. The technical solution, its implementation process, and principles will be further explained below with reference to the accompanying drawings and specific implementation examples in the embodiments of this application.

[0018] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made on the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this application, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0020] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0021] In the description of this application, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person with ordinary skills in the art to which this application pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, mating connection, or integral connection. For a person skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0022] The present invention aims to introduce and explain the structural composition of a plug valve grinding and processing device and the matching relationship between the various components. Unless otherwise specified, the dimensions, materials and manufacturing processes of the various components in the plug valve grinding and processing device of the present invention can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0023] Furthermore, to provide the public with a better understanding of the present invention, certain specific details are described in detail in the following description of the invention. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0024] Please refer to the following: Figures 1-3 This embodiment provides a rotary valve grinding processing device, including a frame 1, a linear motor 2, a grinding mechanism 3, a drive assembly 4, a driven mechanism 5, a pushing mechanism 6, and a fixing component 7; Linear motor 2 is located on the top of frame 1. A grinding mechanism 3 is provided on the output shaft of linear motor 2. Linear motor 2 can drive grinding mechanism 3 to rise and fall. It should be understood that grinding mechanism 3 can grind the stop valve and insert grinding mechanism 3 into stop valve by lowering linear motor 2.

[0025] The drive assembly 4 is slidably connected to the frame 1 and connected to the output shaft of the linear motor 2; the driven mechanism 5 is rotatably mounted on the frame 1, and the lifting of the drive assembly 4 can drive the driven mechanism 5 to rotate in one direction; that is to say, the drive mechanism only drives the driven mechanism 5 to rotate when it is lifted, and will not drive the driven mechanism 5 to rotate when it is lowered.

[0026] The pushing mechanism 6 is slidably mounted on the frame 1. The rotation of the driven mechanism 5 drives the pushing mechanism 6 to perform linear reciprocating motion. The fixing member 7 is slidably mounted on the frame 1 and has two fixed positions. The fixing member 7 is connected to the pushing mechanism 6, and the pushing mechanism 6 can drive the two fixed positions of the fixing member 7 to switch under the grinding mechanism 3. That is, the reciprocating motion of the pushing mechanism 6 causes the fixed positions under the grinding mechanism 3 to switch back and forth. It should be noted that when the plug valve is being ground, the operator can remove the ground plug valve and put in a new plug valve to be ground. The specific fixing method is described extensively in the prior art, and the applicant will not elaborate on it here.

[0027] It should also be noted that the grinding mechanism 3 has been extensively described in the prior art, as shown in CN220348012U, and the applicant will not repeat it here.

[0028] In this application, each lifting of the drive component 4 drives the driven mechanism 5 to rotate in one direction. The rotation of the driven mechanism 5 drives the fixed part 7 to slide back and forth through the push mechanism 6, so that the fixed station under the grinding mechanism 3 switches back and forth. This realizes that after each grinding is completed, the ground plug valve is automatically moved out and the plug valve to be ground is moved in, thus realizing the automation of loading and unloading.

[0029] In other embodiments, the driving mechanism 6 includes a worm gear 61, a worm wheel assembly 62, and a moving assembly 63. The worm gear 61 and the worm wheel assembly 62 are rotatably connected to the frame 1. The driven mechanism 5 can drive the worm gear 61 to rotate, and the worm gear 61 can drive the worm wheel assembly 62 to rotate in one direction; that is, the worm wheel assembly 62 only rotates when the worm gear 61 rotates. The moving assembly 63 is slidably connected to the frame 1 and connected to the fixed member 7. The rotation of the worm wheel assembly 62 can drive the moving assembly 63 to reciprocate linearly. It should be understood that with each lifting of the driving assembly 4, the single displacement length of the moving assembly 63 is the distance between two workstations, and it moves in the opposite direction on the next movement. Through this structure, the position of the fixed member 7 can be fixed after each movement, thereby avoiding accidental deviation of the fixed member 7's position, which would prevent the grinding mechanism 3 from grinding the required position.

[0030] In other embodiments, the worm gear assembly 62 includes a drive shaft 621, a worm gear body 622, and an incomplete gear 623. The drive shaft 621 is rotatably connected to the frame 1. The worm gear body 622 and the incomplete gear 623 are coaxially fixed on the drive shaft 621. The worm 61 can drive the worm gear body 622 to rotate in one direction, and the incomplete gear 623 can drive the moving component 63 to move linearly back and forth.

[0031] In other embodiments, the moving component 63 includes a sliding internal gear ring 631 and a push rod 632; the sliding internal gear ring is an elongated gear ring with teeth on two opposing inner planes, meshing with an incomplete gear 623; the sliding internal gear ring 631 is slidably connected to the frame 1 and connected to the fixing member 7 via the push rod 632. Preferably, the frame 1 is provided with a linear groove, and the sliding internal gear ring 631 is slidably connected within this groove.

[0032] In other embodiments, the drive assembly 4 includes a drive rack 41 and a drive link 42; the drive rack 41 is slidably connected to the frame 1 and connected to the output shaft of the linear motor 2 through the drive link 42; the lifting of the drive rack 41 can drive the driven mechanism 5 to rotate in one direction.

[0033] In other embodiments, the driven mechanism 5 includes a driven gear ring 51, a one-way component 52, a pawl assembly 53, and a transmission belt 54. The driven gear ring 51 is rotatably connected to the frame 1 and can mesh with the rack. The inner side of the driven gear ring 51 is provided with a plurality of ratchet teeth. The one-way component 52 is rotatably connected to the frame 1 and is coaxial with the driven gear ring 51 and located inside the driven gear ring 51. The pawl assembly 53 is rotatably mounted on the one-way component 52. The lifting of the rack can drive the pawl assembly 53 and the one-way component 52 to rotate together in one direction through the ratchet teeth of the driven gear ring 51. The rotation of the one-way component 52 can drive the push mechanism 6 to slide through the transmission belt 54. Specifically, the transmission belt 54 tightly wraps around the one-way component 52 and the worm gear 61, so that the rotation of the one-way component 52 drives the worm gear 61 to rotate. When the rack is raised, the rack drives the driven gear ring 51 to rotate forward, the pawl component 53 does not rotate, and thus drives the one-way component 52 connected to it to rotate together at the same angular velocity. When the rack is lowered, the rack drives the driven gear ring 51 to rotate in reverse, and the pawl component 53 rotates repeatedly, thus keeping the one-way component 52 stationary. It should also be understood that the driven gear ring 51 and the one-way component 52 can remain stationary when the rack is not retracted, due to the friction between themselves and the frame 1.

[0034] In other embodiments, the one-way assembly 52 includes a turntable 521 and a one-way rotating shaft 522; the turntable 521 is rotatably connected to the frame 1 and coaxial with the driven gear ring 51, and located inside the driven gear ring 51; the pawl assembly 53 is eccentrically rotatably connected to the turntable 521; the one-way rotating shaft 522 is coaxially fixed to the turntable 521 and drives the push mechanism 6 to move via a transmission belt 54. Specifically, the transmission belt 54 tightly wraps around the one-way rotating shaft 522 and the worm gear 61.

[0035] In other embodiments, the pawl assembly 53 includes a pawl body 531 and a spring 532; the pawl body 531 is eccentrically rotatably connected to the turntable 521 and is connected to the turntable 521 via the spring 532. It should be understood that the inner ratchet teeth of the driven toothed ring 51 and the pawl assembly 53 form a pawl mechanism, the specific movement process of which is extensively described in the prior art and will not be repeated here.

[0036] In other solutions, a limiting component is also provided. This limiting component can limit the position of the fixing member by sliding. The limiting component includes a limiting seat, a limiting rod, a limiting connecting plate, a limiting spring, and a fixing plate. The limiting seat is fixed to the frame, and the limiting rod is slidably connected to the limiting seat. The fixing member has a limiting groove, and the limiting rod can be inserted into the limiting groove to limit the sliding of the fixing member. The limiting connecting plate is fixed to the limiting rod and connected to the fixing plate through the limiting spring. The fixing plate is fixed to the frame. A cam is also provided on the push shaft near the end of the limiting rod. The limiting rod has an inclined surface near the end of the cam. The rotation of the cam can compress the inclined surface of the limiting rod, causing the limiting rod to insert into the limiting groove. When the incomplete gear rotates, it can simultaneously disengage from the meshing of the upper and lower sides of the sliding internal gear ring. Specifically, the cam is a symmetrical rhomboid plate, and the fixing member has corresponding limiting grooves on two fixed positions.

[0037] In other words, during the rotation of the incomplete gear, there is a period of idling without moving the sliding internal gear ring. Specifically, one rotation of the incomplete gear causes the sliding internal gear ring to slide left and right once each. After moving to the right, the incomplete gear idles; after moving to the left, it idles again. When the incomplete gear enters the idling phase, the fixed part moves to the grinding position. This cycle repeats. When the drive rack completes one lifting and lowering cycle, the incomplete gear moves from one idling state to another. Specifically, in this application, when the drive rack lifts, the movement process of the incomplete gear and related parts is as follows: the drive rack drives the incomplete gear to complete a period of idling, at which point the cam leaves the limit rod, and the limit rod moves away from the limit groove under the action of the limit spring. The incomplete gear and the sliding internal gear ring mesh, causing the sliding internal gear ring to slide. The fixed part moves to another position, and the incomplete gear enters another idling phase. The incomplete gear continues to idle, the cam rotates, pressing the limit rod into the limit groove, and the drive rack moves to the end of its stroke, causing the incomplete gear to stop rotating. With the support of this structure, the drive gear can always be engaged with the driven gear ring and the position of the fixed part can be fixed. This allows the fixed part to move only after the grinding mechanism leaves, so that the raising and lowering of the grinding structure will not interfere with the grinding part. It also prevents the driven gear ring from rotating unexpectedly after the drive rack leaves the driven gear ring, which would cause the fixed part to move.

[0038] The aforementioned plug valve grinding device can automatically replace the next plug valve at the grinding station after grinding is completed, saving manpower.

[0039] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It should not be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A grinding and processing apparatus for a plug valve, characterized in that: Includes frame, linear motor, grinding mechanism, drive assembly, driven mechanism, push mechanism and fixing components; The linear motor is located on the top of the frame, and the grinding mechanism is provided on the output shaft of the linear motor. The linear motor can drive the grinding mechanism to rise and fall. The drive assembly is slidably connected to the frame and connected to the output shaft of the linear motor; the driven mechanism is rotatably mounted on the frame, and the lifting of the drive assembly can drive the driven mechanism to rotate in one direction. The pushing mechanism is slidably mounted on the frame, and the rotation of the driven mechanism can drive the pushing mechanism to perform linear reciprocating motion; the fixing member is slidably mounted on the frame, and the fixing member has two fixed positions. The fixing member is connected to the pushing mechanism, and the pushing mechanism can drive the two fixed positions of the fixing member to switch under the grinding mechanism.

2. The rotary valve grinding and processing apparatus according to claim 1, characterized in that: The driving mechanism includes a worm, a worm gear assembly, and a moving component; the worm and the worm gear assembly are rotatably connected to the frame, the driven mechanism can drive the worm to rotate, and the worm can drive the worm gear assembly to rotate in one direction; the moving component is slidably connected to the frame and connected to the fixed component, and the rotation of the worm gear assembly can drive the moving component to reciprocate linearly.

3. The rotary valve grinding and processing apparatus according to claim 2, characterized in that: The worm gear assembly includes a drive shaft, a worm gear body, and an incomplete gear; the drive shaft is rotatably connected to the frame, the worm gear body and the incomplete gear are coaxially fixed on the drive shaft, the worm can drive the worm gear body to rotate in one direction, and the incomplete gear can drive the moving component to move linearly back and forth.

4. The rotary valve grinding and processing apparatus according to claim 3, characterized in that: The moving component includes a sliding internal gear ring and a push link; the sliding internal gear ring is an elongated gear ring with teeth on two opposing inner planes, which mesh with the incomplete gear; the sliding internal gear ring is slidably connected to the frame and connected to the fixing component through the push link.

5. The rotary valve grinding and processing apparatus according to claim 4, characterized in that: The drive assembly includes a drive rack and a drive link; the drive rack is slidably connected to the frame and connected to the output shaft of the linear motor through the drive link; the lifting of the drive rack can drive the driven mechanism to rotate in one direction.

6. The rotary valve grinding and processing apparatus according to claim 5, characterized in that: The driven mechanism includes a driven gear ring, a one-way component, a pawl assembly, and a transmission belt. The driven gear ring is rotatably connected to the frame and can mesh with the rack. The inner side of the driven gear ring is provided with a plurality of ratchet teeth. The one-way component is rotatably connected to the frame and is coaxial with the driven gear ring, and is located inside the driven gear ring. The pawl assembly is rotatably mounted on the one-way component. The lifting of the rack can unidirectionally drive the pawl assembly and the one-way component to rotate together through the ratchet teeth of the driven gear ring. The rotation of the one-way component can drive the pushing mechanism to slide through the transmission belt.

7. The rotary valve grinding and processing apparatus according to claim 6, characterized in that: The one-way component includes a turntable and a one-way rotating shaft; the turntable is rotatably connected to the frame and coaxial with the driven gear ring, and located inside the driven gear ring; the pawl assembly is eccentrically rotatably connected to the turntable; the one-way rotating shaft is coaxially fixed to the turntable and drives the pushing mechanism to move through the transmission belt.

8. The rotary valve grinding and processing apparatus according to claim 7, characterized in that: The pawl assembly includes a pawl body and a spring; the pawl body is eccentrically rotatably connected to the turntable and is connected to the turntable via the spring.

9. The rotary valve grinding and processing apparatus according to claim 8, characterized in that: A limiting component is also provided, which can limit the position of the fixing member by sliding. The limiting component includes a limiting seat, a limiting rod, a limiting connecting plate, a limiting spring, and a fixing plate. The limiting seat is fixed on the frame, and the limiting rod is slidably connected to the limiting seat. The fixing member is provided with a limiting groove, and the limiting rod can be inserted into the limiting groove to limit the sliding of the fixing member. The limiting connecting plate is fixed on the limiting rod and connected to the fixing plate through the limiting spring. The fixing plate is fixed on the frame. A cam is also provided on the push shaft near the end of the limiting rod. The limiting rod is provided with an inclined surface near the end of the cam. The rotation of the cam can squeeze the inclined surface of the limiting rod, so that the limiting rod is inserted into the limiting groove. When the incomplete gear rotates, it can simultaneously disengage from the meshing of the upper and lower sides of the sliding internal gear ring.

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