Workpiece clamping device for vertical lathe

Abstract

The workpiece clamping device for the vertical lathe comprises an electric chuck and a servo motor, the electric chuck comprises a chuck body, a plurality of clamping jaws and a fluted disc, plane threads are arranged on the fluted disc, tooth grooves are formed in the clamping jaws, and a sliding way is arranged on the chuck body; the servo motor is connected with the fluted disc through a transmission shaft, the transmission shaft is arranged in a main shaft of the lathe, the clutch mechanism is arranged on the transmission shaft and used for connecting or cutting off power transmission, and the brake mechanism is arranged between the transmission shaft and the main shaft. The clamping device is simple in structure, convenient to operate, low in cost and low in energy consumption, long-stroke clamping can be achieved, zero setting is not needed, the size of the clamping position can be adjusted according to the size of a remodeling product, clamping jaw clamping can be automatically adjusted, the clutch mechanism can be connected with or cut off power transmission of the servo motor according to the workpiece clamping and machining requirements, and the machining efficiency is improved. And the brake mechanism keeps a workpiece clamping state, so that the clamping device is suitable for clamping various and small-batch workpieces.

Description

Technical Field

[0001] The utility model relates to a workpiece clamping device for a vertical lathe, belonging to the technical field of vertical lathe workpiece clamping. Background Art

[0002] At present, the devices used for workpiece clamping on CNC vertical lathes mostly use hydraulic chucks. The hydraulic chuck includes a chuck body, claws, a hydraulic cylinder, an oil circuit system, etc. The hydraulic oil enters the hydraulic cylinder to make the piston of the hydraulic cylinder move forward, and the piston drives the claws to move outward. The claws are opened to place the workpiece in the claws. The hydraulic oil enters the hydraulic cylinder to make the piston move backward, and the piston drives the claws to move inward, and the claws clamp the workpiece. The hydraulic chuck uses hydraulic pressure to transfer the clamping force of the claws to the workpiece, thereby achieving the purpose of clamping the workpiece. Although the hydraulic chuck can clamp the workpiece, the structure of the hydraulic chuck used on the vertical lathe is complex, the oil circuit and other configurations are many, and the cost is high. The clamping stroke of the workpiece that the hydraulic chuck can clamp is small, generally 12mm, and the clamping range is limited. It is not suitable for clamping small batches and multiple varieties of workpieces. Summary of the invention

[0003] The utility model aims at the deficiencies in the prior art and provides a workpiece clamping device for a vertical lathe.

[0004] The utility model solves the above technical problems with the following technical solutions: A workpiece clamping device for a vertical lathe, comprising an electric chuck arranged on the lathe and a servo motor for driving the clamping jaws of the electric chuck to clamp or release the workpiece, the electric chuck comprising a chuck body, a plurality of clamping jaws arranged on the chuck body and capable of radial feeding, and a toothed disc rotatably arranged in the chuck body, the toothed disc being provided with a plane thread, the clamping jaws being provided with tooth grooves adapted to the plane thread, and the chuck body being provided with a slideway for radial feeding of the clamping jaws;

[0005] The servo motor is connected to the gear plate of the electric chuck through a transmission shaft. The transmission shaft is arranged in the main shaft of the lathe. The main shaft is provided with a cavity for the transmission shaft to pass through. It also includes a clutch mechanism arranged on the transmission shaft for engaging or cutting off the power transmission of the servo motor and a brake mechanism arranged between the transmission shaft and the main shaft.

[0006] The beneficial effects of the utility model are as follows: when the claw is released, the clutch mechanism is actuated, the brake mechanism is actuated, the brake is released, the transmission shaft is disengaged from the main shaft, the transmission shaft engages the power of the servo motor to transmit it to the toothed disc, the toothed disc rotates under the action of the servo motor so that the claw moves radially outward to reach the position of releasing the claw, after the workpiece is clamped, the toothed disc rotates in the opposite direction under the action of the servo motor so that the claw moves radially inward along the slideway to clamp the workpiece, after the workpiece is clamped in place, the servo motor stops, the clutch mechanism is reset, the power transmission of the servo motor is cut off, and the brake mechanism is executed to maintain the clamping state of the claw workpiece, and the clamped workpiece can be processed. The utility model adopts a servo motor to drive the electric chuck to clamp the workpiece, can realize long-stroke clamping, does not need to be zeroed, can adjust the clamping position size according to the size of the product to be replaced, and automatically adjusts the clamping of the claw, the clutch mechanism can engage or cut off the power transmission of the servo motor according to the workpiece clamping and processing requirements, the brake mechanism can maintain the clamping state of the claw on the workpiece, has a simple structure, is easy to operate, has low cost, and low energy consumption, and can be applied to the clamping of multiple varieties and small batches of workpieces.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the transmission shaft includes a motor pull rod connected to the servo motor, a chuck pull rod connected to the gear disk, and an intermediate pull rod arranged between the motor pull rod and the chuck pull rod.

[0009] The beneficial effect of adopting the above further solution is that the transmission shaft not only transmits the power of the servo motor to the gear plate when power transmission is required, but also prepares for the installation and positioning of the components involved in the clutch mechanism and the brake mechanism.

[0010] Furthermore, the clutch mechanism includes upper teeth arranged on the motor pull rod, lower teeth arranged on the intermediate pull rod and capable of meshing with the upper teeth, and a clutch drive cylinder for driving the upper teeth to engage or disconnect with the lower teeth. The clutch drive cylinder is arranged on the lathe, and the servo motor is connected to the piston rod of the clutch drive cylinder.

[0011] The beneficial effect of adopting the above-mentioned further scheme is that when the power of the servo motor needs to be transmitted to the gear disk, the piston rod of the clutch drive cylinder is lifted up, the motor pull rod moves up, the upper teeth of the motor pull rod engage with the lower teeth of the middle pull rod, and the middle pull rod also moves up. At this time, the brake mechanism does not work, and the power of the servo motor can be transmitted to the gear disk through the transmission shaft; when the power transmission between the servo motor and the gear disk needs to be cut off, the piston rod of the clutch drive cylinder retracts, the motor pull rod moves down, the motor pull rod and the middle pull rod disengage their teeth to cut off the power transmission, and the brake mechanism can maintain the clamping state of the workpiece. If the clamped workpiece needs to be rotated for processing, the clutch mechanism can be used to cut off the power transmission of the servo motor, and the clamping state of the workpiece is maintained by the brake mechanism. The rotation of the workpiece will not transmit the rotational force to the servo motor, the output shaft of the servo motor will not rotate passively, and energy consumption can be reduced.

[0012] Furthermore, the brake mechanism includes a brake shoulder, a pull rod brake and a brake spring. The pull rod brake can act on the brake shoulder under the action of the brake spring. The brake shoulder is arranged on the inner wall of the main shaft. The pull rod brake is arranged on the middle pull rod. The upper end of the middle pull rod is connected to the chuck pull rod through the brake spring.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that the piston rod of the clutch drive cylinder is extended, the motor pull rod moves up and engages with the middle pull rod through the upper and lower teeth, the middle pull rod is lifted, the brake spring is compressed, the middle pull rod moves up and leaves the brake shoulder, the brake is released, and the servo motor drives the gear disk to rotate, thereby realizing radial feed of the claws and avoiding the brake mechanism interfering with the movement of the claws; after the claws clamp the workpiece, the servo motor stops moving, the piston rod of the clutch drive cylinder is reset, the motor pull rod moves down and disengages from the middle pull rod, the middle pull rod moves down under the action of the brake spring, and the pull rod brake on the middle pull rod acts on the brake shoulder on the main shaft, and the pull rod brake contacts the shoulder to execute the brake, thereby ensuring the stability of the clamped workpiece.

[0014] Furthermore, a guide sleeve is provided at the upper portion of the intermediate pull rod, the guide sleeve is sleeved on the outer side of the lower portion of the chuck pull rod, and the brake spring is arranged in the guide sleeve.

[0015] The beneficial effect of adopting the above further solution is that the brake spring between the intermediate pull rod and the chuck pull rod cooperates with the position guide sleeve to constrain and guide, further ensuring the accuracy and stability of the axial movement between the intermediate pull rod and the chuck pull rod.

[0016] Furthermore, the intermediate pull rod is provided with a positioning protrusion for positioning the brake spring.

[0017] The beneficial effect of adopting the above further solution is that the lower end of the brake spring is positioned by the positioning protrusion, thereby improving the positioning stability of the brake spring and the middle pull rod.

[0018] Furthermore, the electric chuck is arranged on the lathe through the main shaft, and the main shaft can rotate under the power of the lathe.

[0019] The beneficial effect of adopting the above further scheme is that the spindle can protect the transmission shaft passing through it on the one hand, and on the other hand, the lathe spindle can be used to meet the rotation requirements of the clamped workpiece during processing. For example, if the workpiece clamped on the vertical lathe needs to be rotated, the lathe spindle can be used to rotate the electric chuck as a whole. Specifically, the spindle can be provided with a transmission wheel that can transmit the power of the lathe to the spindle. The transmission wheel is used to transmit the power of the lathe motor to the spindle. For example, the transmission wheel can be a pulley, and the lathe motor transmits the power to the lathe spindle through the belt, thereby meeting the rotation requirements of the workpiece.

[0020] Furthermore, the servo motor is connected to the piston rod of the clutch drive cylinder via a motor bracket.

[0021] The beneficial effect of adopting the above further solution is that the connection between the servo motor and the clutch drive cylinder is achieved through the motor bracket.

[0022] Furthermore, the clutch drive cylinder is arranged on the lathe through a cylinder mounting plate.

[0023] The beneficial effect of adopting the above further solution is to achieve installation and positioning of the clutch drive cylinder on the lathe.

[0024] Furthermore, a leveling plate is provided between the cylinder mounting plate and the lathe.

[0025] The beneficial effect of adopting the above further solution is that, in order to ensure that the clutch drive cylinder is positioned flat on the lathe, a leveling plate can be additionally provided between the cylinder mounting plate and the lathe.

[0026] Furthermore, a guide rod is provided between the motor bracket and the cylinder mounting plate.

[0027] The beneficial effect of adopting the above further solution is that the servo motor of the clutch drive cylinder is guided and limited when it moves up and down, ensuring that it moves along the axial direction of the piston rod of the clutch drive cylinder.

[0028] Furthermore, a speed reduction mechanism is provided between the transmission shaft and the gear disc.

[0029] The beneficial effect of adopting the above further solution is to reduce the rotation speed of the servo motor, realize the rotational drive of the gear disc, and further ensure the clamping force and clamping accuracy of the workpiece.

[0030] Furthermore, the reduction mechanism includes a fixed external gear and an eccentric gear arranged inside the external gear, the eccentric gear is provided with an eccentric sleeve which is transmission-connected to the transmission shaft, the eccentric gear is provided with an external gear ring, the external gear is provided with an internal gear ring which can mesh with the external gear ring, the eccentric gear is provided with a plurality of transmission holes, the toothed disc is provided with a transmission pin, the lower end of the transmission pin extends into the transmission hole, and the eccentric gear transmits power to the toothed disc through the transmission pin to drive the toothed disc to rotate.

[0031] The beneficial effect of adopting the above further scheme is that the external gear is fixedly arranged, the chuck pull rod and the gear plate of the transmission shaft are coaxial with the external gear, and the chuck pull rod and the gear plate of the transmission shaft rotate relative to the external gear; the structure is simple and compact, the weight is light, and the transmission power is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the utility model;

[0033] Figure 2 It is a partial enlarged view of the electric chuck of the utility model;

[0034] In the figure, 1, chuck body; 2, claw; 21, tooth groove; 3, toothed disc; 31, flat thread; 4, chuck pull rod; 5, middle pull rod; 51, pull rod brake; 52, guide sleeve; 53, lower tooth; 6, brake spring; 7, guide rod; 8, servo motor; 9, motor pull rod; 91, upper tooth; 10, motor bracket; 11, clutch drive cylinder; 12, cylinder mounting plate; 13, main shaft; 131, brake shoulder; 14, transmission wheel; 15, external gear; 16, eccentric gear; 161, eccentric sleeve; 17, transmission pin; 18, leveling plate; 19, lathe. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] like Figure 1 and Figure 2 As shown, a workpiece clamping device for a vertical lathe comprises an electric chuck arranged on a lathe 19 and a servo motor 8 for driving the clamping jaws 2 of the electric chuck to clamp or release the workpiece, the electric chuck comprises a chuck body 1, a plurality of clamping jaws 2 arranged on the chuck body 1 and capable of radial feeding, and a toothed disc 3 rotatably arranged in the chuck body 1, the toothed disc 3 is provided with a plane thread 31, the clamping jaws 2 are provided with tooth grooves 21 adapted to the plane thread 31, and the chuck body 1 is provided with a slideway for radial feeding of the clamping jaws 2;

[0037] The servo motor 8 is connected to the gear plate 3 of the electric chuck through a transmission shaft. The transmission shaft is arranged in the main shaft 13 of the lathe 19. The main shaft 13 is provided with a cavity for the transmission shaft to pass through. It also includes a clutch mechanism arranged on the transmission shaft for engaging or cutting off the power transmission of the servo motor 8 and a brake mechanism arranged between the transmission shaft and the main shaft 13.

[0038] The transmission shaft includes a motor pull rod 9 connected to the servo motor 8, a chuck pull rod 4 connected to the gear plate 3, and an intermediate pull rod 5 arranged between the motor pull rod 9 and the chuck pull rod 4. The transmission shaft not only transmits the power of the servo motor 8 to the gear plate 3 when power needs to be transmitted, but also prepares for the installation and positioning of the components involved in the clutch mechanism and the brake mechanism.

[0039] The clutch mechanism includes an upper tooth 91 arranged on the motor pull rod 9, a lower tooth 53 arranged on the intermediate pull rod 5 and capable of meshing with the upper tooth 91, and a clutch drive cylinder 11 for driving the upper tooth 91 to engage or disconnect with the lower tooth 53. The clutch drive cylinder 11 is arranged on the lathe 19, and the servo motor 8 is connected to the piston rod of the clutch drive cylinder 11. When it is necessary to transmit the power of the servo motor 8 to the gear disk 3, the piston rod of the clutch drive cylinder 11 is lifted, the motor pull rod 9 moves up, the upper teeth 91 of the motor pull rod 9 mesh with the lower teeth 53 of the intermediate pull rod 5, and the intermediate pull rod 5 also moves up. At this time, the brake mechanism does not work, and the power of the servo motor 8 can be transmitted to the gear disk 3 through the transmission shaft; when it is necessary to cut off the power transmission between the servo motor 8 and the gear disk 3, the piston rod of the clutch drive cylinder 11 retracts, the motor pull rod 9 moves down, the motor pull rod 9 and the intermediate pull rod 5 disengage the teeth to cut off the power transmission, and the brake mechanism can maintain the clamping state of the workpiece. If the clamped workpiece needs to be rotated for processing, the clutch mechanism can be used to cut off the power transmission of the servo motor 8, and the clamping state of the workpiece is maintained by the brake mechanism. The rotation of the workpiece will not transmit the rotational force to the servo motor 8, and the output shaft of the servo motor 8 will not be passively rotated, which can also reduce energy consumption.

[0040] The upper teeth 91 and the lower teeth 53 are both straight teeth.

[0041] The brake mechanism includes a brake shoulder 131, a pull rod brake 51 and a brake spring 6. The pull rod brake 51 can act on the brake shoulder 131 under the action of the brake spring 6. The brake shoulder 131 is arranged on the inner wall of the main shaft 13. The pull rod brake 51 is arranged on the intermediate pull rod 5. The upper end of the intermediate pull rod 5 is connected to the chuck pull rod 4 through the brake spring 6. The piston rod of the clutch drive cylinder 11 is extended, the motor pull rod 9 moves up and meshes with the middle pull rod 5 through the upper and lower teeth 53, the middle pull rod 5 is lifted up, the brake spring 6 is compressed, the middle pull rod 5 moves up and leaves the brake shoulder 131, the brake is released, and the servo motor 8 drives the gear disk 3 to rotate, thereby realizing radial feeding of the claw 2 and preventing the brake mechanism from interfering with the movement of the claw 2; after the claw 2 clamps the workpiece, the servo motor 8 stops moving, the piston rod of the clutch drive cylinder 11 is reset, the motor pull rod 9 moves down and disengages from the middle pull rod 5, and the middle pull rod 5 moves down under the action of the brake spring 6, and the pull rod brake 51 on the middle pull rod 5 acts on the brake shoulder 131 on the spindle 13, and the pull rod brake 51 contacts the shoulder to brake, thereby ensuring the stability of the clamped workpiece.

[0042] A guide sleeve 52 is provided on the upper part of the intermediate rod 5, and the guide sleeve 52 is sleeved on the outer side of the lower part of the chuck rod 4, and the brake spring 6 is arranged in the guide sleeve 52. The brake spring 6 cooperates with the guide sleeve 52 between the intermediate rod 5 and the chuck rod 4 to constrain and guide, further ensuring the accuracy and stability of the axial movement between the intermediate rod 5 and the chuck rod 4.

[0043] The intermediate pull rod 5 is provided with a positioning protrusion for positioning the brake spring 6. The lower end of the brake spring 6 is positioned by the positioning protrusion, thereby improving the positioning stability of the brake spring 6 and the intermediate pull rod 5.

[0044] The electric chuck is arranged on the lathe 19 through the spindle 13, and the spindle 13 can rotate under the power of the lathe 19. The spindle 13 can protect the transmission shaft passing through it on the one hand, and on the other hand, the spindle 13 of the lathe 19 can be used to meet the rotation requirements of the clamped workpiece during processing. For example, if the workpiece clamped on the vertical lathe 19 needs to be rotated, the spindle 13 of the lathe 19 can be rotated to realize the rotation drive of the electric chuck as a whole. Specifically, the spindle 13 can be provided with a transmission wheel 14 that can transmit the power of the lathe 19 to the spindle 13. The transmission wheel 14 is used to transmit the power of the lathe 19 motor to the spindle 13. For example, the transmission wheel 14 can be a pulley, and the lathe 19 motor transmits the power to the spindle 13 of the lathe 19 through a belt, thereby meeting the rotation requirements of the workpiece.

[0045] The servo motor 8 is connected to the piston rod of the clutch drive cylinder 11 through the motor bracket 10. The connection between the servo motor 8 and the clutch drive cylinder 11 is achieved through the motor bracket 10.

[0046] The clutch drive cylinder 11 is arranged on the lathe 19 through the cylinder mounting plate 12, so as to realize the installation and positioning of the clutch drive cylinder 11 on the lathe 19.

[0047] A leveling plate 18 is also provided between the cylinder mounting plate 12 and the lathe 19. In order to ensure that the clutch drive cylinder 11 is positioned flat on the lathe 19, a leveling plate 18 can also be provided between the cylinder mounting plate 12 and the lathe 19.

[0048] A guide rod 7 is provided between the motor bracket 10 and the cylinder mounting plate 12. The servo motor 8 is guided and limited when the clutch drive cylinder 11 moves up and down to ensure that it moves in the axial direction of the piston rod of the clutch drive cylinder 11.

[0049] A speed reduction mechanism is also provided between the transmission shaft and the toothed disc 3 to reduce the rotation speed of the servo motor 8, thereby realizing the rotational drive of the toothed disc 3 and further ensuring the clamping force and clamping accuracy of the workpiece.

[0050] The deceleration mechanism includes a fixed external gear 15 and an eccentric gear 16 arranged in the external gear 15, the eccentric gear 16 is provided with an eccentric sleeve 161 connected to the transmission shaft, the eccentric gear 16 is provided with an external gear ring, the external gear 15 is provided with an internal gear ring that can mesh with the external gear ring, the eccentric gear 16 is provided with a plurality of transmission holes, the toothed disc 3 is provided with a transmission pin 17, the lower end of the transmission pin 17 extends into the transmission hole, and the eccentric gear 16 transmits power to the toothed disc 3 through the transmission pin 17 to drive the toothed disc 3 to rotate. The external gear 15 is fixedly arranged, the chuck rod 4 and the toothed disc 3 of the transmission shaft are coaxial with the external gear 15, and the chuck rod 4 and the toothed disc 3 of the transmission shaft rotate relative to the external gear 15; the structure is simple and compact, the weight is light, and the transmission power is large. The chuck rod 4 is connected to the eccentric sleeve 161 through a fastener.

[0051] During the working process, the chuck is released: the piston rod of the clutch drive cylinder 11 is lifted, and the servo motor 8 and the motor pull rod 9 move up accordingly, and the upper teeth 91 of the motor pull rod 9 are engaged with the lower teeth 53 of the intermediate pull rod 5, and the intermediate pull rod 5 moves up to compress the brake spring 6, and the pull rod brake 51 moves up with the intermediate pull rod 5 to disengage from the brake shoulder 131, and the brake is released. The control system such as PLC control reserves a certain space according to the diameter of the workpiece to be clamped, and sends the movement data to the servo motor 8. The servo motor 8 rotates the motor pull rod 9, the intermediate pull rod 5 and the chuck pull rod 4 rotate accordingly and transmit the power to the gear plate 3 through the reduction mechanism. The gear plate 3 rotates, and the tooth groove 21 on the claw 2 moves radially outward along the slideway in cooperation with the flat thread 31 of the gear plate 3, so that the claw 2 is released and waits for the workpiece to be clamped; chuck clamping: wait for the workpiece to be clamped After the clamped workpiece is placed between the clamping jaws 2, the servo motor 8 is actuated to execute torque to clamp the workpiece, that is, the clamping jaws 2 move radially inward along the slideway to clamp the workpiece. After the workpiece is clamped in place, the servo motor 8 stops moving, the piston rod of the clutch drive cylinder 11 is reset, the servo motor 8 and the motor pull rod 9 move down, the motor pull rod 9 and the intermediate pull rod 5 are disengaged, and the intermediate pull rod 5 moves down under the action of the brake spring 6, and the pull rod brake 51 acts on the brake shoulder 131 to brake, and the clamping jaws 2 remain in the state of clamping the workpiece, and the workpiece can be processed; if the workpiece needs to be rotated during processing, the lathe 19 can use its own power to drive the spindle 13 to rotate, that is, the lathe 19 motor transmits power to the spindle 13 through a belt, a transmission wheel 14, etc., and drives the electric chuck to rotate through the spindle 13, thereby meeting the needs of rotation processing of the clamped workpiece.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A workpiece clamping device for a vertical lathe, characterized in that: The invention comprises an electric chuck arranged on a lathe (19) and a servo motor (8) for driving a clamping jaw (2) of the electric chuck to clamp or release a workpiece, the electric chuck comprising a chuck body (1), a plurality of clamping jaws (2) arranged on the chuck body (1) and capable of radial feeding, and a toothed disc (3) rotatably arranged in the chuck body (1), the toothed disc (3) being provided with a planar thread (31), the clamping jaws (2) being provided with tooth grooves (21) matching the planar thread (31), and the chuck body (1) being provided with a slideway for radial feeding of the clamping jaws (2); The servo motor (8) is connected to the gear plate (3) of the electric chuck via a transmission shaft, the transmission shaft is arranged in the main shaft (13) of the lathe (19), and also includes a clutch mechanism arranged on the transmission shaft for engaging or cutting off power transmission and a brake mechanism arranged between the transmission shaft and the main shaft (13).

2. The workpiece clamping device for a vertical lathe according to claim 1, characterized in that: The transmission shaft comprises a motor pull rod (9) connected to the servo motor (8), a chuck pull rod (4) connected to the gear disk (3), and an intermediate pull rod (5) arranged between the motor pull rod (9) and the chuck pull rod (4).

3. The workpiece clamping device for a vertical lathe according to claim 2, characterized in that: The clutch mechanism comprises an upper tooth (91) arranged on the motor pull rod (9), a lower tooth (53) arranged on the intermediate pull rod (5) and capable of meshing with the upper tooth (91), and a clutch drive cylinder (11) for driving the upper tooth (91) to engage or disengage with the lower tooth (53); the clutch drive cylinder (11) is arranged on the lathe (19), and the servo motor (8) is connected to a piston rod of the clutch drive cylinder (11).

4. The workpiece clamping device for a vertical lathe according to claim 2, characterized in that: The brake mechanism comprises a brake shoulder (131), a pull rod brake (51) and a brake spring (6); the pull rod brake (51) can act on the brake shoulder (131) under the action of the brake spring (6); the brake shoulder (131) is arranged on the inner wall of the main shaft (13); the pull rod brake (51) is arranged on the intermediate pull rod (5); and the upper end of the intermediate pull rod (5) is connected to the chuck pull rod (4) through the brake spring (6).

5. The workpiece clamping device for a vertical lathe according to claim 4, characterized in that: A guide sleeve (52) is provided on the upper portion of the intermediate pull rod (5), the guide sleeve (52) is sleeved on the outer side of the lower portion of the chuck pull rod (4), and the brake spring (6) is arranged in the guide sleeve (52); and / or a positioning protrusion for positioning the brake spring (6) is provided on the intermediate pull rod (5).

6. The workpiece clamping device for a vertical lathe according to any one of claims 1 to 5, characterized in that: The electric chuck is arranged on the lathe (19) via the main shaft (13), and the main shaft (13) is rotatable under the power of the lathe (19).

7. The workpiece clamping device for a vertical lathe according to claim 3, characterized in that: The servo motor (8) is connected to the piston rod of the clutch drive cylinder (11) via a motor bracket (10); and / or the clutch drive cylinder (11) is arranged on the lathe (19) via a cylinder mounting plate (12).

8. The workpiece clamping device for a vertical lathe according to claim 7, characterized in that: A leveling plate (18) is further provided between the cylinder mounting plate (12) and the lathe (19); and / or a guide rod (7) is provided between the motor bracket (10) and the cylinder mounting plate (12).

9. The workpiece clamping device for a vertical lathe according to any one of claims 1 to 5, characterized in that: A speed reduction mechanism is also provided between the transmission shaft and the gear disc (3).

10. The workpiece clamping device for a vertical lathe according to claim 9, characterized in that: The speed reduction mechanism comprises a fixedly arranged external gear (15) and an eccentric gear (16) arranged inside the external gear (15); the eccentric gear (16) is provided with an eccentric sleeve (161) which is transmission-connected to the transmission shaft; the eccentric gear (16) is provided with an external gear ring; the external gear (15) is provided with an internal gear ring capable of meshing with the external gear ring; the eccentric gear (16) is provided with a plurality of transmission holes; the toothed disc (3) is provided with a transmission pin (17); the lower end of the transmission pin (17) extends into the transmission hole; the eccentric gear (16) transmits power to the toothed disc (3) through the transmission pin (17) to drive the toothed disc (3) to rotate.

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