CN105057714A - Automatic-feeding lathe tailstock mechanism - Google Patents

Abstract

The invention relates to an automatic feed lathe tailstock mechanism, comprising: a frame body, a drive mechanism and a toggle mechanism installed on the frame body, the drive mechanism and the toggle mechanism are connected by a fork lever, and the drive mechanism is controlled by a power device Drive, the drive mechanism drives the drill bit to move, and the drive mechanism can drive the drive gear to rotate forward and reverse; the toggle mechanism includes a sliding lever, and the two fork levers are respectively located outside the two ends of the drive gear; one end of the drive shaft is provided with a screw rod, The screw sleeve connecting the bent rod is sleeved on the screw rod; the swing rod is connected to the driving rod through the first rotating shaft, the swing rod is connected to the chain rod through the second rotating shaft, and the swing rod is rotated through the third rotating shaft; the two ends of the chain are respectively connected to the free end of the chain rod and the The free end of the curved rod, the free end of the chain rod and the free end of the curved rod can be pushed together; one end of the first spring is fixedly connected to the swing rod at the second rotating shaft, and the other end of the first spring is fixedly connected to the fixed block superior. A bump is also arranged on the driving lever, and the bump is connected with the stop mechanism.

Description

An Automatic Feeding Lathe Tailstock Mechanism

technical field

The invention relates to a lathe tailstock, in particular to an automatic feeding lathe tailstock mechanism.

Background technique

Drilling on an ordinary lathe, the general method is to install the tapered shank of the drill in the tapered hole of the tailstock, fix the tailstock on the lathe guide rail, and then manually operate the hand wheel at the rear end of the tailstock to make the tailstock The seat cylinder advances along the axial direction of the drill bit to realize the translational feed of the drill bit; otherwise, the handwheel is reversed to make the tailstock cylinder retreat along the axial direction of the drill bit to realize the translational retraction of the drill bit. This method has high labor intensity and low labor efficiency for mass production of shaft holes, especially through holes.

Therefore, for general drilling processing, especially large-scale through-hole processing, it is necessary to design a set of mechanical transmission mechanism to realize automatic operation, reversing, and stop of hand wheel rotation, instead of manual hand cranking.

This type of mechanism is generally composed of a drive mechanism for power output and a toggle mechanism for controlling reversing. After the drilling of a workpiece is completed, the drill needs to be paused so that the workpiece can be replaced after it moves back. In order to temporarily cut off the power output without stopping the operation of the driving mechanism, a set of auxiliary devices is also needed to control the toggle mechanism.

Contents of the invention

The invention overcomes the disadvantages of the prior art, and provides a lathe tailstock with an automatic feed lathe tailstock mechanism driven by a spring swing bar and assisted by a chain.

In order to achieve the above object, the technical solution adopted by the present invention is: a kind of automatic feed lathe tailstock mechanism, comprising: frame body, and the drive mechanism and toggle mechanism installed on the frame body, the drive mechanism and toggle mechanism pass through The shift fork rods are connected, the drive mechanism is driven by the power device, and the drive mechanism drives the drill bit to move, and it is characterized in that,

- the drive mechanism can drive the drive gear to rotate forward and reverse;

- the toggling mechanism includes a sliding lever, on which two fork levers are arranged, and the two fork levers are respectively located outside the two ends of the driving gear;

One end of the drive shaft is provided with a screw rod, and the screw sleeve connecting the bent rod is threaded on the screw rod;

The first rotating shaft, the second rotating shaft and the third rotating shaft are arranged in turn on the swing rod, the swing rod is connected to the lever through the first rotating shaft, the swing rod is connected to the chain rod through the second rotating shaft, and the swing rod is rotated through the third rotating shaft; the two ends of the chain are respectively connected The free end of the chain rod and the free end of the curved rod, the free end of the chain rod and the free end of the curved rod can be pushed together; one end of the first spring is fixedly connected to the swing rod at the second rotating shaft The other end of the first spring is fixedly connected to the fixed block.

A bump is also provided on the shift lever, and the bump is engaged with the stop mechanism.

In a preferred embodiment of the present invention,

- when the driving gear meshes with the first gear, the swing bar is biased towards the first gear, and the first spring is located on one side of the swing bar's offset direction;

- When the driving gear meshes with the second gear, the swing bar is biased toward the second gear, and the first spring is located at one side of the swing bar's biasing direction.

In a preferred embodiment of the present invention, the first spring is in a stretched state.

In a preferred embodiment of the present invention,

- when the driving gear meshes with the first gear, the screw drives the screw sleeve away from the driving gear, and the chain is in a tight state;

- When the driving gear meshes with the second gear, the screw drives the screw sleeve close to the driving gear, the chain is in a relaxed state, and the free end of the chain rod and the free end of the curved rod are pushed together .

In a preferred embodiment of the present invention, the distance between the two shift fork rods is greater than the axial length of the driving gear.

In a preferred embodiment of the present invention, a stopper is provided on both sides of the free end of the swing rod.

In a preferred embodiment of the present invention, the two ends of the driving rod are respectively slidably socketed on the respective sleeve blocks.

In a preferred embodiment of the present invention, the driving gear sliding key is arranged on the driving shaft, and the moving distance of the driving gear on the sliding key of the driving shaft is the axis of the first gear and the second gear to the distance.

In a preferred embodiment of the present invention, the drive mechanism includes a first gear and a second gear that can respectively mesh with the drive gear, the drive gear is slidably arranged on the drive shaft, the first gear and the second gear The gears rotate in the opposite direction;

The first gear is coaxially connected with a transmission gear, and the transmission gear meshes with the second gear.

In a preferred embodiment of the present invention, the stop mechanism includes a stop lever with a wedge-shaped head at one end and a fixing plate, the wedge-shaped head of the stop lever protrudes outside one surface of the fix plate, and the other end of the stop lever The second and first springs are sheathed outside the other surface of the fixing plate, and the two ends of the second and first springs are respectively fixed on the fixing plate and the stop bar; the wedge-shaped head includes a wedge-shaped surface and a rectangular face.

In a preferred embodiment of the present invention, a handle is provided at the end of the stop rod on the stop mechanism.

In a preferred embodiment of the present invention, the first gear and the transmission gear are coaxially arranged on the first transmission shaft, the second gear is arranged on the second transmission shaft, and the first transmission shaft and the The second transmission shaft is arranged in parallel, and the second gear meshes with the transmission gear.

In a preferred embodiment of the present invention, the power device is a motor, and one end of the drill bit is coaxially provided with a hand wheel pulley.

In a preferred embodiment of the present invention, the first transmission shaft is connected to the motor by a belt, and the drive shaft is connected to the pulley of the hand wheel by a belt.

The hand wheel shaft at the other end of the lathe position where the drill bit is located is provided with a hand wheel belt pulley.

The present invention solves the defect existing in the background technology, and the present invention has the following beneficial effects:

(1) Through the action of the toggle mechanism, the position of the driving gear can be changed between the first gear and the second gear, which plays the role of changing the meshing object of the driving gear. At the same time, because the first gear and the second gear rotate in opposite directions, Ensure that the drive shaft changes direction of rotation each time the drive gear changes meshing objects.

(2) The rotation direction of the drive shaft and the toggle direction of the toggle mechanism just form a linkage structure. When the drive gear meshes with the first gear, the toggle mechanism is driven by the drive shaft so that the toggle mechanism has the ability to turn the drive gear to the second gear. The tendency and power of the gear, and finally the driving gear is separated from the first gear, and driven by the elastic potential energy of the first spring on the swing rod to mesh with the second gear; otherwise, when the driving gear meshes with the second gear, the toggle mechanism will make the driving gear reverse movement.

(3) On the one hand, the structure of the feather key can ensure that there is a clamp limit between the drive gear and the drive shaft along the circumference of the drive shaft, so that the drive gear will not move relative to the drive shaft along the circumference; on the other hand, the drive gear can Sliding along the axial direction of the drive shaft ensures that the drive gear moves between the first gear and the second gear.

(4) The two fork levers are respectively located on both sides of the drive gear, and the drive gear can move axially along the drive shaft under the drive of the lever.

(5) The set block can limit the movement posture of the lever, and at the same time, the stopper can limit the swing lever driven by the first spring within a certain swing range, and then the movement range of the lever is also limited to ensure that the lever will not be excessive The left and right offsets only ensure the distance between the first gear and the second gear for the drive gear to change mesh.

(6) When the driving gear meshes with the first gear, the pendulum shifts toward the side of the first gear. At this time, the first spring tightens the pendulum, and the screw sleeve is driven away from the first gear by the screw rod, and then the chain is tightened, and then Pull the swing bar to rotate towards the second gear side, and when the swing bar crosses the vertical state, the driving gear will disengage from the first gear, at this time, the pulling force of the first spring will pull the swing bar towards the second gear side, and Swing the pendulum toward the second gear, and finally press the drive gear to mesh with the second gear.

(7) During the left and right movement of the fork lever, the two fork levers continuously push the drive gear to move left and right along the drive shaft to change the meshing objects.

(8) The first rotating shaft, the second rotating shaft and the third rotating shaft cooperate with each other, so that the pendulum can rotate with the third rotating shaft as the center of a circle, drive the shift lever to move left and right, and then drive the fork lever to follow the shift lever to move left and right.

(9) The structure of the chain can ensure that when the screw sleeve is far away from the first gear, the chain is tightened, and the chain increases the total length of the chain rod and the bent rod; when the screw sleeve is close to the first gear, the chain is loose, and the end of the bent rod and the chain rod The ends are topped together, and the total length does not include the length of the chain at this time.

(10) Through the set soft connection, it is ensured that during the reciprocating movement of the screw sleeve, when the swing rod is pushed, the distance between the screw sleeve and the swing rod will change due to the change of the chain, so that for the auxiliary lever Push the position change of the driving gear and the meshing object transformation.

(11) The setting of the stopper ensures that the lower end of the swing rod will not deviate beyond the range, that is, the swing rod will not make the moving range of the lever too large.

(12) The structure of the screw driving the screw sleeve, and then the screw sleeve provides the power source for the toggle mechanism. Since the rotation direction of the screw is related to the meshing object of the drive gear, the movement direction of the screw sleeve is related to the rotation direction of the drive shaft, and The direction of rotation of the drive shaft is controlled by the toggle mechanism; thus, the above-mentioned process forms a cyclic motion process that influences each other, and the toggle mechanism and the drive mechanism continuously affect the continuous cycle control.

(13) The distance between the two shift fork rods is greater than the axial length of the drive gear, which can provide inertial buffering for the reverse movement of the drive gear.

(14) The distance between the two shift fork rods is greater than the axial length of the drive gear, and the length longer than the gear is the margin of the distance between the two shift fork rods relative to the length of the drive gear. Due to the existence of the above margin, the swing rod is in the When in the vertical state, the two shift fork rods will not be blocked by the drive gear, and the swing rod only needs to rely on inertia when it crosses its vertical state.

(15) The transmission gear is coaxial with the first gear, and the second gear meshes with the transmission gear to realize the reverse rotation of the first gear and the second gear.

(16) The handle can pull up the stop lever on the stop mechanism, so that the bump blocked by the right-angled surface on the stop mechanism can be released from the restraint, and the lever can continue to move left and right. As long as the mechanism is not pulled up, it can only do single Periodic movement.

(17) The position of the stop mechanism can block the projection at the position where the drive gear is just between the first gear and the second gear, and the drive gear is disengaged at this time.

(18) Through the transmission function of the driving mechanism, the purpose of transmitting the power of the motor to the drill bit is realized; at the same time, through the function of the toggle mechanism, the meshing object of the driving gear can be changed, and then the drill bit can move forward and backward along its axial direction and Stop after backtracking is complete.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a three-dimensional structure diagram one of a preferred embodiment of the present invention;

Fig. 2 is a three-dimensional structure diagram two of a preferred embodiment of the present invention;

Fig. 3 is a three-dimensional structure diagram 1 of a toggle mechanism and a drive mechanism in a preferred embodiment of the present invention;

Fig. 4 is a three-dimensional structure diagram 2 of a toggle mechanism and a drive mechanism in a preferred embodiment of the present invention;

Fig. 5 is the three-dimensional structural diagram of stop mechanism of the present invention;

In the figure: 1, the first gear, 2, the second gear, 3, the driving gear, 4, the driving shaft, 5, the feather key, 6, the transmission gear, 7, the driving lever, 8, the fork lever, 9, the cover block , 10, screw rod, 11, screw sleeve, 12, bent rod, 13, chain, 14, chain rod, 15, swing rod, 16, first rotating shaft, 17, second rotating shaft, 18, third rotating shaft, 19, the first One spring, 20, block, 21, fixed block, 22, stop mechanism, 23, stop lever, 24, second spring, 25, wedge-shaped head, 26, wedge-shaped surface, 27, right-angled surface, 28, bump, 29 , handle, 30, fixed plate, 31, bolt locking device, 32, frame body, 33, first transmission shaft, 34, second transmission shaft, 35, motor, 36, drill bit, 37, belt, 38, hand wheel, 39, handle, 40, hand wheel pulley, 41, lathe tailstock.

Detailed ways

The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so it only shows the composition related to the present invention.

As shown in Figures 1-5, an automatic feed lathe tailstock mechanism includes: a frame body 32, and a drive mechanism and a toggle mechanism installed on the frame body 32, the drive mechanism and the toggle mechanism pass through the fork lever 8 connection, the driving mechanism is driven by the power unit, and the driving mechanism drives the drill bit 36 to move,

The drive mechanism includes a drive gear 3 that can mesh with the first gear 1 and the second gear 2 respectively, the drive gear 3 is slidably arranged on the drive shaft 4, and the rotation direction of the first gear 1 and the second gear 2 is opposite; the toggle mechanism includes a slide The shift lever 7 provided, two shift fork levers 8 are arranged on the shift lever 7, and the two shift fork levers 8 are respectively located at the outer sides of the two ends of the driving gear 3; Driven by the driving rod 7, it moves axially along the drive shaft 4.

One end of the drive shaft 4 is provided with a screw rod 10, and the screw sleeve 11 connected to the bent rod 12 is threaded on the screw rod 10; the screw rod 10 drives the structure of the screw sleeve 11, and then the screw sleeve 11 provides a power source for the toggle mechanism. The direction of rotation is related to the meshing object of the drive gear 3, so the direction of motion of the screw sleeve 11 is related to the direction of rotation of the drive shaft 4, and the direction of rotation of the drive shaft 4 is controlled by the toggle mechanism; During the cycle movement process, the toggle mechanism and the drive mechanism continuously affect the continuous cycle control.

The first gear 1 and the transmission gear 3 are coaxially arranged on the first transmission shaft 33, the second gear 2 is arranged on the second transmission shaft 34, the first transmission shaft 33 is arranged in parallel with the second transmission shaft 34, and the second gear 2 Mesh together with transmission gear 3, power unit is motor 35, and drill bit 36 one end coaxially is provided with hand wheel belt pulley 40. Through the transmission effect of the driving mechanism, the purpose of delivering the power of the motor 35 to the drill bit 36 is achieved; at the same time, through the action of the toggle mechanism, the meshing object of the driving gear 3 can be changed, thereby realizing the advancement and retreat of the drill bit 36 along its axial direction .

The first transmission shaft 33 is connected to the motor 35 by a belt 37 , and the belt 37 of the drive shaft 4 is connected to the hand wheel pulley 40 . The belt pulley on the motor 35, the belt pulley on the first transmission shaft 33, the belt pulley on the drive shaft 4 and the hand wheel pulley 40 play the role of the motor 35 speed deceleration through the transmission effect of the two belts 37, the hand wheel belt pulley 40 The speed is reduced. The motor 35 that the present invention adopts is also a low-speed motor.

Handwheel belt pulley 40 ends are provided with handwheel 38, and handwheel 38 is provided with handle 39, and the setting of handwheel 38 and handle 39 can realize that human operation drives drill bit 36 to advance and retreat along its axial direction.

The first rotating shaft 16, the second rotating shaft 17 and the third rotating shaft 18 are successively arranged on the swing rod 15, the swing rod 15 is connected to the shift lever 7 through the first rotating shaft 16, the swing rod 15 is connected to the chain rod 14 through the second rotating shaft 17, and the swing rod 15 Rotate through the third shaft 18; the two ends of the chain 13 are respectively connected to the free end of the chain bar 14 and the free end of the bent bar 12, and the free end of the chain bar 14 and the free end of the bent bar 12 can be pushed together; the first spring 19 One end of the first spring 19 is fixedly connected to the swing rod 15 at the second rotating shaft 17 , and the other end of the first spring 19 is fixedly connected to the fixed block 21 . The first rotating shaft 16, the second rotating shaft 17 and the third rotating shaft 18 cooperate with each other, so that the swing rod 15 can rotate with the third rotating shaft 18 as the center of a circle, and drive the shift lever 7 to move left and right, and then drive the shift fork rod 8 to follow the shift rod 7 to move left and right .

Through the action of the toggle mechanism, the position of the driving gear 3 can be changed between the first gear 1 and the second gear 2, which plays the role of changing the meshing object of the driving gear 3. At the same time, due to the rotation of the first gear 1 and the second gear 2 The direction is opposite to ensure that the drive shaft 4 changes the direction of rotation each time the drive gear 3 changes the meshing object.

The rotation direction of the drive shaft 4 and the toggle direction of the toggle mechanism just form a linkage structure. When the drive gear 3 meshes with the first gear 1, the toggle mechanism is driven by the drive shaft 4 so that the toggle mechanism has the ability to turn the drive gear 3 to The inclination and power of the second gear 2, and finally the drive gear 3 breaks away from the first gear 1, and is driven by the elastic potential energy of the first spring 19 on the fork 15 to mesh with the second gear 2; otherwise the drive gear 3 and the second gear 2 When engaged, the toggle mechanism will cause the drive gear 3 to move in reverse.

During the left and right movement of the shift lever 7, the shift fork lever 8 continuously pushes the drive gear 3 to move left and right along the drive shaft 4 through the two shift fork levers 8 to change the meshing object.

The structure of the chain 13 can ensure that when the screw sleeve 11 is away from the first gear 1, the chain 13 is tightened, and the chain 13 increases the total length of the chain bar 14 and the bent bar 12; when the screw sleeve 11 is close to the first gear 1, the chain 13 is loose, The ends of the bent bar 12 and the chain bar 14 are butted together, and the total length does not include the length of the chain 13 at this time.

Through the flexible connection provided, it is ensured that during the reciprocating movement of the screw sleeve 11, when the swing rod 15 is pushed, the distance between the screw sleeve 11 and the swing rod 15 will change the length of a chain 13 due to the change of the chain 13, so for The auxiliary lever 7 promotes the position change of the driving gear 3 and the transformation of the meshing object.

- When the driving gear 3 meshes with the first gear 1, the swing lever 15 is biased towards the direction of the first gear 1, and the first spring 19 is located on one side of the swing lever 15 in the direction of deviation;

- When the driving gear 3 meshes with the second gear 2 , the pendulum 15 is biased toward the second gear 2 , and the first spring 19 is located on one side of the pendulum 15 in the direction of deviation.

The first spring 19 is in tension.

When the driving gear 3 meshes with the first gear 1, the screw 10 drives the nut 11 away from the driving gear 3, and the chain 13 is in a tight state; when the driving gear 3 meshes with the second gear 2, the screw 10 drives the nut 11 to approach the driving gear 3 , the chain 13 is in a relaxed state, and the free end of the chain bar 14 and the free end of the bent bar 12 are abutted against each other. When the driving gear 3 is meshed with the first gear 1, the swing bar 15 is shifted towards the first gear 1 side, at this moment, the first spring 19 tightens the swing bar 15, and the screw sleeve 11 is driven away from the first gear 1 by the screw rod 10, and then The chain 13 is tightened, and then the swing lever 15 is pulled to rotate toward the second gear 2. When the swing lever 15 crosses the vertical state, the drive gear 3 is disengaged from the first gear 1, and the pulling force of the first spring 19 will be Pull the swing lever 15 toward the second gear 2 , and swing the swing lever 15 toward the second gear 2 , and finally press the drive gear 3 to mesh with the second gear 2 .

The distance between the two shift fork rods 8 is greater than the axial length of the drive gear 3 , which can provide inertial buffering for the reverse movement of the drive gear 3 . The distance between the two shift fork rods 8 is greater than the axial length of the drive gear 3, and the length longer than the drive gear 3 is the margin of the distance between the two shift fork rods 8 relative to the length of the drive gear 3. Due to the existence of the above margin, the pendulum When the bar 15 was in the vertical state, the two shift fork rods 8 would not be blocked by the drive gear 3, and the fork 15 only needed to rely on inertia when it crossed its vertical state.

Fork 15 free ends both sides are respectively provided with a stopper 20, and the setting of stopper 20 guarantees that the lower end of fork 15 can not deviate beyond the range, that is fork 15 can not make driving lever 7 move too much.

The two ends of the driving rod 7 are respectively slidably socketed on the respective corresponding sets of blocks 9, the sets of blocks 9 can limit the movement posture of the driving rod 7, and the stopper 20 can limit the swing rod 15 driven by the first spring 19 to a certain swing. Within the range, and then the range of movement of the driving rod 7 is also limited, so as to ensure that the driving rod 7 will not deviate excessively left and right, and only ensure that the driving gear 3 changes the meshing distance between the first gear 1 and the second gear 2.

The sliding key 5 of the driving gear 3 is arranged on the driving shaft 4 , and the moving distance of the driving gear 3 on the sliding key 5 of the driving shaft 4 is the axial distance between the first gear 1 and the second gear 2 . On the one hand, the structure of the feather key 5 can ensure that there is a clamp limit between the drive gear 3 and the drive shaft 4 along the circumference of the drive shaft 4, so that the drive gear 3 will not move relative to the drive shaft 4 along the circumference; The driving gear 3 can slide along the axial direction of the driving shaft 4 to ensure that the driving gear 3 moves between the first gear 1 and the second gear 2 .

The first gear 1 is coaxially connected to the transmission gear 6, the transmission gear 6 meshes with the second gear 2, the transmission gear 6 is coaxial with the first gear 1, and the second gear 2 meshes with the transmission gear 6, realizing the first gear 1 and the second gear The reverse rotation of the second gear 2.

The end of stop bar 23 on stop mechanism 22 is provided with handle, and handle 30 can pull up stop bar 23 on stop mechanism 22, and the projection 28 that is blocked by right-angled surface 27 on stop mechanism 22 can break away from restraint like this, driving lever 7 just can continue to move left and right, as long as do not pull up this mechanism just can only do single cycle motion. The position of the stop mechanism 22 can block the protrusion 28 at the position where the driving gear 3 is just located between the first gear 1 and the second gear 2 , and the driving gear 3 is disengaged at this time.

Stop mechanism 22 comprises a stop bar 23 and a fixed plate 30 that one end has wedge-shaped head 25, and fixed plate 30 is connected with a sleeve block 9, and the wedge-shaped head 25 of stop bar 23 stretches out fixed plate 30 one face outsides, and stop bar 23 other One end of the second spring 24 protrudes from the outside of the other surface of the fixing plate 30 . The two ends of the second spring 24 are respectively fixed on the fixing plate 30 and the stop bar 23 .

As shown in Figure 1, the projection 28 can only cross the wedge-shaped surface 26 on the stop mechanism 22 from the left side of the stop mechanism 22 to the right side of the stop mechanism 22, but the projection 28 cannot cross the stop mechanism from the right side of the stop mechanism 22. Right-angled surface 27 on 22 reaches the left side of stop mechanism 22.

The curved rod 12 is provided with a bolt locking device 31 at its corner, and the part of the curved rod 12 parallel to the drive shaft 4 can be inserted into the inner hole of the bolt locking device 31 and slide in the inner hole. The bolt locking device 31 The bolts on the top are screwed in and screwed out to control the tightness; by adjusting the relative position of the bent rod 12 and the bolt locking device 31, the position adjustment of the bent rod 12 to the shift fork rod 8 can be realized, so as to adjust the shifting of the shift fork rod 8 to the driving gear. timing.

The driving rod 7 can only move along the axial direction of the driving rod 7 itself under the restriction of the cover block 9, but the driving rod 7 cannot rotate along the axial direction of the driving rod itself in the cover block 9, so that the movement on the driving rod 7 is ensured. The shift fork lever 8 can not turn to, and it has also ensured that the shift fork lever 8 can be moved to the drive gear 3 on its motion track.

The above is inspired by the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the description, and must be determined according to the scope of the claims.

Claims (10)

1. A lathe tailstock mechanism of automatic feeding, comprising: a frame body, and a drive mechanism and a toggle mechanism installed on the frame body, the drive mechanism and the toggle mechanism are connected by a shift fork lever, and the drive mechanism is powered by a power The device is driven, and the driving mechanism drives the drill bit to move, and it is characterized in that, - the drive mechanism can drive the drive gear to rotate forward and reverse; - the toggling mechanism includes a sliding lever, on which two fork levers are arranged, and the two fork levers are respectively located outside the two ends of the driving gear; One end of the drive shaft is provided with a screw rod, and the screw sleeve connecting the bent rod is threaded on the screw rod; The first rotating shaft, the second rotating shaft and the third rotating shaft are arranged in turn on the swing rod, the swing rod is connected to the lever through the first rotating shaft, the swing rod is connected to the chain rod through the second rotating shaft, and the swing rod is rotated through the third rotating shaft; the two ends of the chain are respectively connected The free end of the chain rod and the free end of the curved rod, the free end of the chain rod and the free end of the curved rod can be pushed together; one end of the first spring is fixedly connected to the swing rod at the second rotating shaft , the other end of the first spring is fixedly connected to the fixed block, A bump is also provided on the shift lever, and the bump is engaged with the stop mechanism. 2. A kind of automatic feed lathe tail stock mechanism according to claim 1, it is characterized in that: described drive mechanism comprises the first gear and the second gear that can mesh with drive gear respectively, and described drive gear is slidingly arranged On the drive shaft, the first gear and the second gear rotate in opposite directions; The first gear is coaxially connected with a transmission gear, and the transmission gear meshes with the second gear. 3. A kind of automatic feed lathe tailstock mechanism according to claim 2, is characterized in that: - when the driving gear meshes with the first gear, the swing bar is biased towards the first gear, and the first spring is located on one side of the swing bar's offset direction; - When the driving gear meshes with the second gear, the swing bar is biased toward the second gear, and the first spring is located at one side of the swing bar's biasing direction. 4. The tailstock mechanism of an automatic feeding lathe according to claim 3, wherein the first spring is in a stretched state. 5. A kind of automatic feed lathe tailstock mechanism according to claim 2, is characterized in that: - when the driving gear meshes with the first gear, the screw drives the screw sleeve away from the driving gear, and the chain is in a tight state; - When the driving gear meshes with the second gear, the screw drives the screw sleeve close to the driving gear, the chain is in a relaxed state, and the free end of the chain rod and the free end of the curved rod are pushed together . 6. The tailstock mechanism of an automatic-feed lathe according to claim 1, characterized in that: the distance between the two shift fork rods is greater than the axial length of the driving gear. 7. The tailstock mechanism of an automatic-feed lathe according to claim 1, wherein a stopper is provided on both sides of the free end of the swing rod. 8 . The tailstock mechanism of an automatic-feed lathe according to claim 1 , characterized in that: the two ends of the driving rod are respectively slidably socketed on the corresponding sleeves. 9 . 9. The tailstock mechanism of a kind of automatic feeding lathe according to claim 2, characterized in that: the drive gear feather key is arranged on the drive shaft, and the drive gear moves on the drive shaft feather key The distance is the axial distance between the first gear and the second gear. 10. A kind of automatic feed lathe tail stock mechanism according to claim 1, it is characterized in that: said stop mechanism comprises a stop bar with a wedge-shaped head at one end and a fixing plate, and the wedge-shaped head of said stop bar extends out of one surface of the fixed plate, the other end of the stop rod is sleeved with the second first spring protruding out of the other surface of the fixed plate, and the two ends of the second first spring are respectively fixed on the fixed plate and stop bar; said wedge-shaped head includes a wedge-shaped face and a right-angled face.