CN115816009A - A CV joint automatic steel ball loading device - Google Patents

Abstract

The invention discloses an automatic steel ball loading device for a CV joint.A lifting mechanism I drives swing rods I and II and servo motors I and II to lift, the servo motors I and II respectively drive the swing rods I and II to rotate, when the swing rods I and II descend to the lowest positions, the swing rods I are pressed on a retainer of the CV joint, the swing rods II are inserted into inner annular holes of the CV joint, and the swing rods I and II are used for swinging the retainer of the CV joint and the inner ring to a certain angle, so that steel balls can be conveniently loaded; the CV joint indexing mechanism comprises a servo motor III and a CV joint tool fixed on an output shaft of the servo motor III and used for rotating the CV joint to a specified angle; the ball supply mechanism comprises a steel ball bin, a steel ball storage, a steel ball feeder fixed in an inclined mode and a lifting mechanism II, and is used for supplying steel balls to convey the steel balls to a specified position. The invention has the advantages of accurate alignment of the steel balls assembled on the CV joint, no neglected loading, improved assembly quality and qualification rate of products, greatly reduced labor intensity of workers and improved production efficiency.

Description

A CV joint automatic steel ball loading device

technical field

The invention belongs to the technical field of manufacturing CV joints for automobiles, and relates to a CV joint automatic steel ball loading device.

Background technique

During the operation of the vehicle, the wheel is a high-speed rotating part, and the CV joint is connected to the wheel hub to transmit power and torque, and is a key component of the drive shaft. At present, the steel balls of the CV section are assembled by traditional pure manual methods, and the quality and efficiency of the assembly depend entirely on the proficiency of the operator, which has the defects of low efficiency, difficult assembly, high labor intensity and easy wrong assembly. In addition, with the continuous improvement of people's requirements for vehicle safety factors and the gradual increase in the output of half shafts, the CV joints produced by manually assembling steel balls are far from meeting the needs of the market.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, and to provide a device for automatically installing steel balls in CV joints, which can be used to assemble steel balls in CV joints in a stable installation position, accurate alignment, and no missing installation, which improves the The assembly quality and pass rate of the product require low operating experience for workers, which greatly reduces the labor intensity of workers and improves production efficiency.

To achieve the above object, the technical solution of the present invention is: a CV joint automatic steel ball loading device, including a fixed connection plate, a workbench, a ball loading mechanism, a ball supply mechanism, and a CV joint rotatably connected to the workbench Indexing mechanism and controller; the ball loading mechanism includes pendulum Ⅰ, pendulum Ⅱ, servo motor Ⅰ, servo motor Ⅱ and lifting mechanism Ⅰ; the fixed part of lifting mechanism Ⅰ is fixed on the fixed connecting plate, and the lifting connector Ⅰ drives the pendulum Ⅰ. Swing rod Ⅱ, servo motor Ⅰ and servo motor Ⅱ go up and down. Servo motor Ⅰ and servo motor Ⅱ respectively drive the swing rod Ⅰ and swing rod Ⅱ to rotate. When the swing rod Ⅰ and swing rod Ⅱ drop to the lowest position, the swing rod Ⅰ presses Connected to the cage of the CV section, the swing rod II is inserted into the inner ring hole of the CV section; the indexing mechanism of the CV section includes the servo motor III and the CV section tooling fixed on the output shaft of the servo motor III, and the handle end of the CV section is clamped It is connected and fixed on the CV section tooling; the ball feeding mechanism includes a steel ball silo fixed on the workbench through a bracket, a steel ball storage with a steel ball downflow channel inside, a tilted and fixed steel ball pusher and a lifting mechanism II; The steel ball silo is connected to the material receiving port on the upper end of the steel ball storage through a connecting pipe. The steel ball storage has a steel ball outlet facing the steel ball inlet of the steel ball pusher, and a valve is installed at the steel ball outlet of the steel ball storage. And the counter, the counter controls the valve to open through the controller and only one steel ball flows out; the steel ball outlet of the steel ball pusher is facing the CV joint, and the stroke of the servo motor Ⅰ and servo motor Ⅱ is set, when the swing rod Ⅰ and the swing rod Ⅱ After the swing is tilted in place, a steel ball pushed out by the steel ball pusher is facing one of the steel ball windows of the cage. When the swing rod Ⅰ and swing rod Ⅱ swing to the vertical position, the servo motor Ⅲ drives the CV joint to rotate an angle, so that The steel ball outlet of the steel ball pusher corresponds to another steel ball window adjacent to the cage; the fixed part of the lifting mechanism II is fixed on the fixed connecting plate, and its lifting joint II drives the steel ball storage and the steel ball pusher up and down ; The controller controls the actions of the lifting mechanism Ⅰ, the lifting mechanism Ⅱ, the servo motor Ⅰ, the servo motor Ⅱ and the servo motor Ⅲ.

Further preferably, the lifting mechanism I of the ball loading mechanism includes a cylinder I, a cylinder support plate I, a vertical plate, a connecting head, a connecting block, a sliding plate, a transition plate, a limit screw, a fixing block, a supporting plate, a guide rail I and a slide Seat I; cylinder I is fixed on the cylinder support plate I, cylinder support plate I is fixed on the vertical plate, and the edge of the vertical plate is fixed with guide rail I; the vertical plate is directly fixed on the fixed connecting plate or the vertical plate is fixed on the support plate , the support plate is fixed on the fixed connecting plate; the two sliding seats I used in conjunction with the guide rail I are fixed with a sliding plate; the piston rod of the cylinder I is also fixed on the lifting joint I. A connecting block, the connecting block It is fixed on the top of the slide plate; there is a fixed block fixed on the lower end of the vertical plate directly below the slide plate, and a limit screw is fixed on the fixed block, which limits the lowest position of the slide plate to move down; a transition plate is fixed on the slide plate; the casing is fixed on the transition plate The servo motor I and the servo motor II are respectively fixed on the slide plate; the shaft I is rotatably fixed in the upper hole of the transition plate, and the other end of the shaft I is rotatably fixed in the casing; the shaft I passes through the The through hole is fixed on the output shaft of the servo motor I through the coupling I; the shaft II is rotatably fixed in the lower hole of the transition plate, and the shaft II passes through another through hole on the slide plate and is fixed on the servo motor through the coupling II. On the output shaft of II; the other end of the rotating shaft II is equipped with a gear shaft and a bearing V is installed between the other end and the gear shaft; the outer circle of the gear shaft is rotatably fixed on the casing; the left end of the gear shaft is fixed with a gear II, the gear I meshing with the gear II is fixed on the relative position of the rotating shaft I; the swing rod I is fixed on the right end of the gear shaft, and the swing rod II is fixed on the right end of the rotating shaft II. The extension and retraction of the lifting connector of the cylinder Ⅰ drives the slide plate to move down and up along the guide rail Ⅰ, thereby driving the transition plate and the casing installed on the transition plate, the shaft I, the shaft II, the gear I, the gear II, the gear shaft, The pendulum Ⅰ, pendulum Ⅱ, servo motor Ⅰ and servo motor Ⅱ and other components descend and rise as a whole, and the limit screw limits the lowest position where the slide plate descends. At this time, the pendulum Ⅰ is crimped on the cage of the CV section, and the pendulum Ⅱ Insert it into the inner ring hole of the CV section, and the whole machine handles the working state of loading steel balls. The lifting mechanism facilitates the replacement of the CV section where steel balls are to be installed. Servo motor Ⅰ and servo motor Ⅱ drive the swing rod Ⅰ and swing rod Ⅱ to rotate and tilt, so that the inner ring of the CV joint and the cage are inclined to be in the state of loading steel balls, and drive the swing rod Ⅰ and swing rod Ⅱ to rotate vertically, so that the CV Rotate the joint by an angle until the other adjacent window of the cage of the CV joint is in the position of receiving the steel ball.

Further preferably, the lifting mechanism II of the ball supply mechanism includes a cylinder II, a cylinder support plate II, a vertical plate, a guide rail II, a sliding seat II and a sliding plate; the cylinder II is fixed on the cylinder support plate II, and the cylinder support plate II is fixed On the vertical plate, the guide rail II is fixed on the vertical plate, and the sliding seat II used in conjunction with the guide rail II is fixed on the sliding plate; the piston rod of the cylinder II is also the lifting connector II mentioned above. It is fixed on the sliding plate through the connecting block II. The vertical plate is fixed on the fixed connecting plate; there is a limit block fixed on the lower end of the vertical plate directly below the sliding plate, and a limit screw Ⅰ is fixed on the limit block, and the limit screw Ⅰ limits the lowest position of the sliding plate to move down; The steel ball storage and the steel ball pusher are fixed on the sliding plate; the steel ball storage bin is higher than the steel ball storage, and the upper end of the steel ball downflow channel in the steel ball storage has an inclined surface, and the steel balls are filled with steel balls. Downstream channel, one steel ball silo flows one less; the lower end of the steel ball storage is fixed on the upper end of the steel ball pusher, and the inclined bottom plate of the steel ball pusher is fixed with the cylinder III, and the piston rod end of the cylinder III An inclined pusher plate parallel to the inclined bottom plate is fixed on the upper part. When not in action, the lower end of the pusher plate is located at the upper end of the steel ball inlet of the steel ball pusher, and the cylinder III is controlled by the controller. The extension and retraction of the lifting connector of the cylinder II drives the sliding plate to move down and up along the guide rail II, thereby driving the steel ball storage and the steel ball pusher to move down and up, which facilitates the replacement of the CV joint to be loaded with steel balls; Cylinder III pushes the steel ball into the window of the CV section cage.

Further preferably, the CV section tooling includes a positioning seat and a base; the center of the positioning seat has a central mounting hole matching the handle end of the CV section, and there is a positioning step on the outer circle of the bottom; the base has a central hole, and the positioning seat The positioning step penetrates into the center hole of the base and is fixed by a plug; the lower end of the base is fixed on the fixing plate located in the mounting hole of the workbench step, the fixing plate is fixed on the upper end of the main shaft, and the main shaft is fixed on the workbench step through the bearing. In the installation hole, the lower end of the main shaft is fixed on the output shaft of the servo motor III through a coupling. Servo motor III drives the CV joint tooling to rotate, thereby driving the CV joint to rotate by an angle.

The invention can accurately and conveniently assemble the steel ball into the CV joint, improves the assembly quality of the product, and further makes the vehicle run safer and more durable. The invention has accurate alignment, no missing assembly, high qualified rate of products, low requirements for workers' operating experience, greatly reduces labor intensity of workers, improves production efficiency, and has stable and reliable assembly quality. Moreover, the invention has the advantages of simple structure, convenient use and strong generalization.

Description of drawings

Fig. 1 is the front view of the present invention;

FIG. 2 is an AA sectional view of FIG. 1 .

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

As shown in Figures 1 and 2, this embodiment includes a fixed connecting plate 27, a workbench 13, a ball loading mechanism 01, a ball feeding mechanism 02, a CV joint indexing mechanism 03 rotatably connected to the workbench 13, and a control device. The ball loading mechanism 01 includes a swing rod I9, a swing rod II10, a servo motor I28, a servo motor II32 and a lifting mechanism I. The fixed part of the lifting mechanism I is fixed on the fixed connecting plate 27. The lifting connection head I5 drives the swing rod I9, the swing rod II10, the servo motor I28 and the servo motor II32 to lift up and down, and the servo motor I28 and servo motor II32 respectively drive the swing rod I9 and the swing rod II10 rotates, and when the swing rod I9 and the swing rod II10 descend to the lowest position, the swing rod I9 is crimped on the cage 49-2 of the CV section 49, and the swing rod II10 is inserted into the inner ring hole 49-1 of the CV section 49. Preferably, the lifting mechanism I of the ball loading mechanism 01 includes a cylinder I1, a cylinder support plate I2, a vertical plate 3, a connecting head 5, a connecting block 6, a sliding plate 7, a transition plate 8, a limit screw 11, a fixing block 12, Support plate 24, guide rail I25 and sliding seat I26. The cylinder I1 is fixed on the cylinder support plate I2 by screws, and the cylinder support plate I2 is fixed on the vertical plate 3 by screws. The edge of the vertical plate 3 is fixed with a guide rail I25; the vertical plate 3 is fixed on the support plate 24 by screws, and the support plate 24 is fixed on the fixed connecting plate 27 by screws (the vertical plate 3 can also be directly fixed on the fixed connecting plate 27). The two sliding seats I26 used in conjunction with the guide rail I25 are fixed with slide plates 7 by screws. A connecting block 6 is fixed on the piston rod of the cylinder I1, that is, the lifting connector I5, and the connecting block 6 is fixed on the upper end of the slide plate 7 by screws. Sliding plate 7 just below has the fixing block 12 that is fixed on vertical plate 3 lower ends by screw, and fixing limit screw 11 is fixed on the fixing block 12, and limiting screw 11 limits the lowest position that slide plate 7 moves down. The transition plate 8 is fixed on the slide plate 7 by screws; A rotating shaft I30 is rotatably fixed in the upper hole of the transition plate 8 through a bearing I31, and the other end of the rotating shaft I30 is rotatably fixed in the casing through a bearing II43. The rotating shaft I30 passes through the through hole on the slide plate 7 and is fixed on the output shaft of the servo motor I28 through the shaft coupling I29. The shaft II 34 is rotatably fixed in the lower hole of the transition plate 8 through the bearing III 35 , and the shaft II 34 passes through another hole on the slide plate 7 and is fixed on the output shaft of the servo motor II 32 through the coupling II 33 . The other end of the rotating shaft II34 is gap-fitted with the gear shaft 44 and a bearing V56 is fitted between the other end and the gear shaft 44 . The outer circle of the gear shaft 44 is rotatably fixed on the casing through the bearing IV 37 and the pressure block I 39. A gear II36 is fixed on the left end of the gear shaft 44, and a gear I42 meshing with the gear II36 is fixed on the relative position of the rotating shaft I30. The swing rod I9 is fixed on the right end of the gear shaft 44 through the key I38 and the pressure block II40, and the swing rod II10 is fixed on the right end of the rotating shaft II34 through the key II45, the pressure block III41 and the end screw 46. The CV joint indexing mechanism 03 includes the servo motor III 55 and the CV joint tooling fixed on the output shaft of the servo motor III 55, and the handle end of the CV joint 49 is clipped and fixed on the CV joint tooling. Preferably, the CV section tooling includes a positioning seat 50 and a base 52; the center of the positioning seat 50 is provided with a central mounting hole matching the handle end of the CV section 49, and there is a positioning step on the outer circumference of the bottom. The base 52 has a central hole, and the positioning step of the positioning seat 50 penetrates into the central hole of the base 52, and is fixed by a latch 51; , the fixed plate 53 is fixed on the upper end surface of the main shaft, the main shaft is fixed in the step mounting hole of the workbench 13 through the bearing 57, and the lower end of the main shaft is fixed on the output shaft of the servo motor III 55 through the coupling 54. The ball feeding mechanism 02 includes a steel ball bin 21 fixed on the workbench 13 by a bracket 14, a steel ball storage 16 with a steel ball downflow channel 4 inside, an obliquely fixed steel ball pusher 15 and a lifting mechanism II. The steel ball silo 21 is connected to the material receiving port 18 on the upper end of the steel ball storage 16 through the connecting pipe 20, and the steel ball storage 16 has a steel ball outlet facing the steel ball inlet of the steel ball pusher 15, and the steel ball storage 16 A valve and a counter are installed at the outlet of the steel ball, and the counter is controlled by the controller to open the valve and only one steel ball flows out. The steel ball outlet of the steel ball pusher 15 is facing the CV joint 49, and the strokes of the servo motor I28 and the servo motor II32 are set. The steel ball is facing one of the steel ball windows of the cage. When the swing rod I9 and the swing rod II10 swing to the vertical position, the servo motor III drives the CV joint 49 to rotate an angle, so that the steel ball outlet of the steel ball pusher 15 is kept correspondingly. Another steel ball window adjacent to the frame; the lifting mechanism II fixed part is fixed on the fixed connecting plate 27, and its lifting joint II 19 drives the steel ball storage 16 and the steel ball pusher 15 to lift. The controller controls the actions of the lifting mechanism I, the lifting mechanism II, the servo motor I28, the servo motor II32 and the servo motor III55. Preferably, the lifting mechanism II of the ball feeding mechanism 02 includes a cylinder II 23 , a cylinder supporting plate II 22 , a vertical plate 47 , a guide rail II, a sliding seat II and a sliding plate 48 . The cylinder II 23 is fixed on the cylinder support plate II 22 by screws, the cylinder support plate II 22 is fixed on the vertical plate 47 by screws, the vertical plate 47 is fixed with a guide rail II by screws, and the sliding seat II used in conjunction with the guide rail II is fixed with a slide plate 48 . The piston rod of the cylinder II23, that is, the lifting connector II19 is fixed on the sliding plate 48 through the connecting block II, and the vertical plate 47 is fixed on the fixed connecting plate 27 by screws. Just below the sliding plate 48 there is a stop block 60 fixed on the lower end of the vertical plate 47, and the stop screw I is fixed on the stop block 60, and the stop screw I limits the lowest position where the slide plate 48 moves down. The steel ball storage 16 and the steel ball pusher 15 are fixed on the sliding plate 48 by screws. The steel ball silo 21 is higher than the steel ball storage 16, and the upper end of the steel ball downflow passage 4 in the steel ball storage 16 has an inclined surface. One comes over; the lower end of the steel ball reservoir 16 is fixed on the upper end of the steel ball pusher 15, the inclined bottom plate 58 of the steel ball pusher 15 is fixed with the cylinder III 17, and the end of the piston rod of the cylinder III 17 is fixed with an inclined Base plate 58 parallel inclined pusher plate 59, when not moving, the lower end of pusher plate 59 is positioned at the upper end of the steel ball inlet of steel ball pusher 15, and cylinder III 17 is controlled action by controller.

The above-described embodiments are only preferred and exemplary, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention within.

Claims (5)

1. The utility model provides a CV festival automatic dress steel ball device which characterized in that: comprises a fixed connecting plate, a workbench, a ball loading mechanism, a ball supply mechanism, a CV joint indexing mechanism which is rotatably connected on the workbench and a controller; the ball loading mechanism comprises a swing rod I, a swing rod II, a servo motor I, a servo motor II and a lifting mechanism I; the fixed part of a lifting mechanism I is fixed on a fixed connecting plate, a lifting connector I drives a swing rod I, a swing rod II, a servo motor I and a servo motor II to lift, the servo motor I and the servo motor II respectively drive the swing rod I and the swing rod II to rotate, when the swing rod I and the swing rod II descend to the lowest positions, the swing rod I is pressed on a retainer of a CV joint, and the swing rod II is inserted into an inner annular hole of the CV joint; the CV joint indexing mechanism comprises a servo motor III and a CV joint tool fixed on an output shaft of the servo motor III, and a handle end of the CV joint is clamped and fixed on the CV joint tool; the ball supply mechanism comprises a steel ball bin fixed on the workbench through a bracket, a steel ball storage with a steel ball down-flow channel inside, a steel ball pusher fixed in an inclined manner and a lifting mechanism II; the steel ball bin is connected with a material receiving port at the upper end of the steel ball storage through a connecting pipe, a steel ball outlet of the steel ball storage is opposite to a steel ball inlet of the steel ball feeder, a valve and a counter are mounted at the steel ball outlet of the steel ball storage, and the counter controls the valve to be opened through a controller so that only one steel ball flows out; the steel ball outlet of the steel ball feeder is over against the CV joint, the stroke of the servo motor I and the servo motor II is set, when the swing rod I and the swing rod II swing and incline to the right position, one steel ball pushed out by the steel ball feeder is over against one of the steel ball windows of the retainer, and when the swing rod I and the swing rod II swing to the vertical position, the servo motor III drives the CV joint to rotate by an angle, so that the steel ball outlet of the steel ball feeder corresponds to the other steel ball window adjacent to the retainer; the fixed part of the lifting mechanism II is fixed on the fixed connecting plate, and the lifting connector II drives the steel ball storage and the steel ball pusher to lift; the controller controls the actions of the lifting mechanism I, the lifting mechanism II, the servo motor I, the servo motor II and the servo motor III.

2. The automatic steel ball loading device for the CV joint as recited in claim 1, wherein: the lifting mechanism I of the ball loading mechanism comprises a cylinder I, a cylinder support plate I, a vertical plate, a connector, a connecting block, a sliding plate, a transition plate, a limit screw, a fixed block, a support plate, a guide rail I and a sliding seat I; the air cylinder I is fixed on an air cylinder support plate I, the air cylinder support plate I is fixed on a vertical plate, and a guide rail I is fixed at the edge of the vertical plate; the vertical plate is directly fixed on the fixed connecting plate or the vertical plate is fixed on the support plate, and the support plate is fixed on the fixed connecting plate; sliding plates are fixed on the two sliding seats I which are matched with the guide rail I; a connecting block is fixed on a piston rod of the air cylinder I, namely the lifting connector I, and the connecting block is fixed at the upper end of the sliding plate; a fixed block fixed at the lower end of the vertical plate is arranged right below the sliding plate, a limit screw is fixed on the fixed block, and the limit screw limits the lowest position of the sliding plate moving downwards; a transition plate is fixed on the sliding plate; the shell is fixed on the transition plate, and the servo motor I and the servo motor II are respectively fixed on the sliding plate; a rotating shaft I is rotatably fixed in an upper hole of the transition plate, and the other end of the rotating shaft I is rotatably fixed in the shell; the rotating shaft I penetrates through a through hole in the sliding plate and is fixed on an output shaft of the servo motor I through a coupler I; a rotating shaft II is rotatably fixed in a lower hole of the transition plate, penetrates through another through hole in the sliding plate and is fixed on an output shaft of a servo motor II through a coupler II; a gear shaft is assembled at the other end of the rotating shaft II in a clearance mode, and a bearing V is assembled between the other end of the rotating shaft II and the gear shaft; the outer circle of the gear shaft is rotatably fixed on the shell; a gear II is fixed at the left end of the gear shaft, and a gear I meshed with the gear II is fixed at the opposite position of the rotating shaft I; the swing rod I is fixed at the right end of the gear shaft, and the swing rod II is fixed at the right end of the rotating shaft II.

3. The CV joint automatic steel ball loading device according to claim 1 or 2, wherein: the lifting mechanism II of the ball supply mechanism comprises an air cylinder II, an air cylinder support plate II, a vertical plate, a guide rail II, a sliding seat II and a sliding plate; the air cylinder II is fixed on an air cylinder support plate II, the air cylinder support plate II is fixed on a vertical plate, a guide rail II is fixed on the vertical plate, and a sliding plate is fixed on a sliding seat II matched with the guide rail II; a piston rod of the air cylinder II, namely the lifting connector II is fixed on the sliding plate through a connecting block II, and the vertical plate is fixed on the fixed connecting plate; a limiting block fixed at the lower end of the vertical plate is arranged right below the sliding plate, a limiting screw I is fixed on the limiting block, and the limiting screw I limits the lowest position of the sliding plate in the downward movement; the steel ball storage and the steel ball feeder are fixed on the sliding plate; the steel ball bin is higher than the steel ball storage, the upper end of a steel ball down-flow channel in the steel ball storage is provided with an inclined plane, the steel ball down-flow channel is filled with steel balls, and one steel ball bin flows in each steel ball bin; the lower end of the steel ball storage is fixed at the upper end of the steel ball feeder, an air cylinder III is fixed on an inclined bottom plate of the steel ball feeder, an inclined material pushing plate parallel to the inclined bottom plate is fixed at the end part of a piston rod of the air cylinder III, when the steel ball storage does not act, the lower end of the material pushing plate is located at the upper end of a steel ball inlet of the steel ball feeder, and the air cylinder III is controlled to act by a controller.

4. The automatic steel ball loading device for the CV joint as recited in claim 3, wherein: the CV joint tool comprises a positioning seat and a base; the center of the positioning seat is provided with a center mounting hole matched with the handle end of the CV joint, and the outer circle at the bottom of the positioning seat is provided with a positioning step; the base is provided with a central hole, and the positioning step of the positioning seat penetrates through the central hole of the base and is inserted and fixed by a plug pin; the lower end of the base is fixed on a fixing plate in the workbench step mounting hole, the fixing plate is fixed on the upper end face of the main shaft, the main shaft is fixed in the workbench step mounting hole through a bearing, and the lower end of the main shaft is fixed on an output shaft of the servo motor III through a coupler.

5. The automatic steel ball loading device for the CV joint as recited in claim 1 or 2, wherein: the CV joint tool comprises a positioning seat and a base; the center of the positioning seat is provided with a center mounting hole matched with the handle end of the CV joint, and the outer circle at the bottom of the positioning seat is provided with a positioning step; the base is provided with a central hole, and the positioning step of the positioning seat penetrates through the central hole of the base and is inserted and fixed by a plug pin; the lower end of the base is fixed on a fixing plate in the workbench step mounting hole, the fixing plate is fixed on the upper end face of the main shaft, the main shaft is fixed in the workbench step mounting hole through a bearing, and the lower end of the main shaft is fixed on an output shaft of the servo motor III through a coupler.

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