Numerical control pipe thread lathe pipe feeding center positioning device

Abstract

The application relates to a pipe center positioning device for a numerical control pipe thread lathe, and relates to the technical field of lathe machining. The pipe center positioning device comprises a machine body, a machine head arranged on the machine body, the machine head sliding along the length direction of the machine body, a clamping disc rotationally arranged on the machine head, a clamping jaw installed on the clamping disc, a plurality of support assemblies evenly arranged on the machine body along the length direction, the support assembly comprising a support table, a support ring and a plurality of support blocks, the support table being installed on the machine body, the support ring being installed on the support table, the plurality of support blocks being synchronously slidably arranged in the support ring, and one end of each support block being embedded with a support ball towards the center direction of the support ring, so that the pipe production error is reduced.

Description

Technical Field

[0001] This application relates to the field of lathe machining, and in particular to a tube inlet center positioning device for a CNC pipe threading lathe. Background Technology

[0002] CNC lathes are large production equipment used for turning. When machining long pipes, due to the limited travel of the cutting tools on CNC lathes, a fixed tool is used to drive the pipe feed. For example, when machining external threads with a drill collar, the thread cutting tool is fixed and the drill collar is fed to machine the external thread. However, because the pipe is long, it is difficult to ensure a straight feed, which can easily lead to production errors in the machined pipe. Summary of the Invention

[0003] To reduce production errors in pipes, this application provides a pipe inlet center positioning device for a CNC pipe threading lathe.

[0004] The technical solution provided in this application for a CNC pipe threading lathe inlet center positioning device is as follows:

[0005] A CNC pipe threading lathe inlet center positioning device includes a machine body, on which a machine head is mounted. The machine head slides along the length of the machine body, and a clamping disc is rotatably mounted on the machine head. The clamping disc is equipped with grippers. A plurality of support components are evenly arranged along the length of the machine body. Each support component includes a support platform, a support ring, and support blocks. The support platform is mounted on the machine body, the support ring is mounted on the support platform, and there are a plurality of support blocks. The plurality of support blocks slide synchronously within the support ring, and a support ball is embedded at one end of the support block facing the center of the support ring.

[0006] By adopting the above technical solution, the pipe is supported by the support components, reducing the probability that the pipe at the end away from the machine head will be subjected to greater gravity, causing the pipe to tilt as a whole. This makes the pipe conveying straighter and reduces the production error of the pipe.

[0007] Optionally, an adjustment mechanism is provided between the support ring and the support block. The adjustment mechanism includes an adjustment rod, an adjustment spring, and an adjustment ring. Several adjustment rods are provided corresponding to the support blocks, and several adjustment rods are respectively fixed to the ends of several support blocks facing the adjustment ring. The adjustment rods slide through the support ring, and the ends of the adjustment rods extending out of the support ring have chamfers. The adjustment springs are sleeved on the adjustment rods, with one end abutting against the inner wall of the support ring and the other end abutting against the support block. The adjustment springs drive the support blocks to slide away from the center of the support ring through elastic force. The adjustment rings are threaded to the outer wall of the support ring, and the adjustment rings drive the adjustment rods to slide closer to the center of the support ring by rotating and abutting against the chamfer.

[0008] Optionally, the clamping disk has a groove at its center, and a positioning component is provided in the groove. The positioning component includes a positioning ring, a positioning block, and a positioning spring. The positioning ring is installed on the clamping disk in the groove. There are several positioning blocks, and the several positioning blocks are synchronously slidably disposed in the positioning ring. Several positioning springs are provided corresponding to the positioning blocks and are disposed between the positioning ring and the positioning blocks. The elastic force of the positioning springs drives the positioning blocks to slide towards the center of the positioning ring.

[0009] Optionally, a driving mechanism is provided between the gripper and the positioning block. When the gripper slides toward the center of the gripping disk, the gripper drives the positioning block to slide away from the center of the positioning ring through the driving mechanism.

[0010] Optionally, the positioning ring is detachably mounted on the gripper disc, and the support ring is detachably mounted on the support platform.

[0011] Optionally, a slide groove is provided on the machine body along the length direction of the machine body, a drive block is fixedly provided on the machine head, the drive block slides in the slide groove by means of a cylinder, and a slider is fixedly provided on the support platform, the slider slides in the slide groove.

[0012] Optionally, the slider is provided with a reinforcing mechanism, which includes an abutment block and a reinforcing spring. The abutment block is slidably disposed on the side wall of the slider, and the reinforcing spring is disposed between the abutment block and the slider. The reinforcing spring drives the abutment block to abut against the side wall of the slide groove.

[0013] Optionally, the slider is provided with a linkage block. When the driving block slides and hits the linkage block, the linkage block slides on the slider. The sliding of the linkage block causes the abutment block to slide away from the side wall of the slide groove.

[0014] Optionally, the support ring includes a lower half ring and an upper half ring. The lower half ring is detachably installed on the support platform, and the upper half ring is detachably installed on the lower half ring. The upper half ring is installed on the lower half ring via an adjusting ring.

[0015] Optionally, the machine body includes a head and a tail, which are respectively located at both ends of the CNC lathe along its length.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. By supporting the pipe with the support components, the probability of the pipe tilting as a whole due to the greater gravity on the end of the pipe away from the machine head is reduced, thereby making the pipe conveying straighter and reducing the production error of the pipe. The ball bearings can reduce the friction when the pipe slides and feeds in the support ring.

[0018] 2. The adjustment mechanism can synchronously adjust the support block so that the balls on the support block can abut against the pipe, thereby positioning the pipe in the center of the support ring and reducing the probability of pipe deviation.

[0019] 3. The positioning component temporarily positions the pipe, ensuring that the pipe groove is centered on the clamping plate before the gripper clamps it in place, thus facilitating the installation and positioning of the support mechanism. The drive block slides along the gripper, causing the drive rod to slide. The sliding of the drive rod causes the hinge rod to rotate, and the rotation of the hinge rod causes the positioning block to detach from the pipe, thereby reducing the impact of the positioning mechanism on the pipe after the gripper clamps it in place.

[0020] 4. By making the positioning ring and support ring detachable, the support ring and positioning ring can be installed on the pipe before the pipe is installed, and the support block and positioning block can be adjusted, which facilitates the subsequent installation of the pipe.

[0021] 5. By driving the abutting block to disengage from the side wall of the slide, the machine head can drive the abutting support platform to slide. When the support platform does not affect the sliding of the machine head, the probability of the pipe feed driving the support platform is reduced. When the support platform affects the machine head, it can be carried by the machine head to slide, reducing the probability of the support platform restricting the movement of the machine head.

[0022] 6. By removing the upper ring plate, the support ring can be used as a support component to support the pipe, thereby facilitating the guidance of the pipe during subsequent tail conveying. The support assembly can also be installed in a CNC lathe. By removing the upper half ring, the impact on the cutting tool is reduced. The adjusting ring can be used to adjust the position of the support block and also to fix the upper and lower half rings. The lower half ring is equipped with fixing bolts. Tightening the fixing bolts can fix the position of the support block. Before removing the upper half ring, the support block on the lower half ring is fixed by tightening the fixing bolts to reduce the probability of the support block slipping under force. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the structure of the head section in an embodiment of this application.

[0025] Figure 3 This is a structural schematic diagram of the support component in an embodiment of this application.

[0026] Figure 4 yes Figure 3 A magnified view of section A in the middle.

[0027] Figure 5 yes Figure 2 A magnified view of section B in the middle.

[0028] Figure 6 yes Figure 3 A magnified view of section C.

[0029] Figure 7 This is a structural diagram showing the connection between the CNC lathe and the machine body.

[0030] Figure 8 This is a cross-sectional schematic diagram of the baffle at the CNC lathe.

[0031] In the diagram, 0 is the CNC lathe; 1 is the machine body; 101 is the head; 102 is the tail; 2 is the machine head; 3 is the clamping plate; 4 is the gripper; 5 is the support assembly; 51 is the support table; 52 is the support ring; 521 is the lower half ring; 522 is the upper half ring; 53 is the support block; 6 is the ball bearing; 7 is the adjusting mechanism; 71 is the adjusting rod; 72 is the adjusting spring; 73 is the adjusting ring; 8 is the chamfer; 9 is the groove; 10 is the positioning assembly; 1001 is the positioning ring; 1002 is the positioning block; 1003 is the positioning spring; 11 is the positioning ring; 12 is the positioning ring; 13 is the positioning ring; 14 is the positioning ring; 15 is the positioning ring; 16 is the positioning ring; 17 is the positioning ring; 18 is the positioning ring; 19 is the positioning ring; 1002 is the positioning ring; 1003 is the positioning ring; 1004 is the positioning ring; 1005 is the positioning ring; 1006 is the positioning ring; 1007 is the positioning ring; 1008 is the positioning ring; 1009 is the positioning ring; 10 ... Drive mechanism; 111, drive slider; 112, drive rod; 113, hinge rod; 12, positioning block; 13, positioning slot; 14, slide groove; 15, drive block; 16, slider; 17, reinforcing mechanism; 171, abutment block; 172, reinforcing spring; 18, linkage block; 19, mounting device; 191, mounting hole; 192, mounting block; 1921, connecting plate; 1922, insertion plate; 20, baffle; 21, torsion spring; 22, ratchet; 23, pawl; 24, mounting hole. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 The present application will be further described with reference to specific embodiments:

[0033] First, it should be noted that in the description of this application, the use of directional terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for descriptive purposes and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of numerical quantifiers such as "first," "second," and "third" is for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, interference fits, transition fits, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Therefore, those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] This application discloses a pipe inlet center positioning device for a CNC pipe threading lathe, referring to... Figure 1 , Figure 2 and Figure 3 The system includes a machine body 1 mounted on the ground, comprising a head 101 and a tail 102, which are respectively mounted on the ground at both ends of the CNC lathe 0 along its length. A machine head 2 is mounted on the head 101 of the machine body 1. The machine head 2 is driven by a rodless cylinder to slide along the length of the machine body 1. A clamping disc 3 is rotatably mounted on the machine head 2, and a motor is installed on the machine head 2. The clamping disc 3 is driven by the motor to rotate on the machine head 2. Grippers 4 are mounted on the clamping disc 3. In this embodiment, the clamping disc 3 and grippers 4 are the chuck and grippers of a three-jaw chuck, and three grippers 4 are provided. A plurality of support components 5 are evenly arranged along the length of the machine body 1. Both the head 101 and the tail 102 are provided with a support component 5, which includes a support platform 51 installed on the machine body 1, a support ring 52 installed on the support platform 51, and several support blocks 53 that are synchronously slidably disposed in the support ring 52. In this embodiment, three support blocks 53 are provided, and the three support blocks 53 are evenly distributed in the support ring 52. Support balls 6 are embedded at the end of the support block 53 facing the center of the support ring 52. The support component 5 supports the pipe, reducing the probability that the pipe at the end away from the machine head 2 will be subjected to greater gravity and thus tilting the pipe as a whole. This makes the pipe conveying straighter and reduces the production error of the pipe. The setting of the balls 6 can reduce the friction of the pipe when it slides and feeds in the support ring 52.

[0035] Reference Figure 3 and Figure 4An adjustment mechanism 7 is provided between the support ring 52 and the support block 53. The adjustment mechanism 7 includes several adjustment rods 71 ​​corresponding to the support blocks 53, adjustment springs 72 sleeved on the adjustment rods 71, and an adjustment ring 73 threaded to the outer wall of the support ring 52. The adjustment rods 71 ​​are respectively fixed to the ends of the support blocks 53 facing the adjustment ring 73. The adjustment rods 71 ​​slide through the support ring 52. The end of the adjustment rod 71 extending out of the support ring 52 has a chamfer 8. One end of the adjustment spring 72 abuts against the inner wall of the support ring 52 and the other end abuts against the support block 53. The adjustment spring 72 drives the support block 53 to slide away from the center of the support ring 52 through its elastic force. The adjusting ring 73 slides on the support ring 52 towards or away from the adjusting rod 71 by rotating. When the adjusting ring 73 slides towards the adjusting rod 71 by rotating, it abuts against the chamfer 8 and drives the adjusting rod 71 to slide towards the center of the support ring 52. When the adjusting ring 73 slides away from the adjusting rod 71 by rotating, the adjusting rod 71 slides away from the center of the support ring 52 under the action of elastic force. The adjusting mechanism 7 can synchronously adjust the support block 53 so that the ball 6 on the support block 53 can abut against the pipe, thereby placing the pipe at the center of the support ring 52, thus centering the pipe and reducing the probability of pipe deviation.

[0036] Reference Figure 1 , Figure 2 and Figure 5The clamping disk 3 has a groove 9 at its center, and a positioning component 10 is disposed within the groove 9. The positioning component 10 includes a positioning ring 1001, a positioning block 1002, and a positioning spring 1003. The positioning ring 1001 is installed on the clamping disk 3 within the groove 9. There are several positioning blocks 1002; in this embodiment, three positioning blocks 1002 are provided. All positioning blocks 1002 are synchronously slidably disposed within the positioning ring 1001. Several positioning springs 1003 are provided corresponding to the positioning blocks 1002 and are disposed between the positioning ring 1001 and the positioning blocks 1002. The elastic force of the positioning springs 1003 drives the positioning blocks 1002 to slide towards the center of the positioning ring 1001. The positioning component 10 temporarily positions the pipe, ensuring that the pipe groove is at the center of the clamping disk 3 before the gripper 4 clamps and fixes it, thereby facilitating the installation and positioning of the support mechanism. A positioning mechanism is provided between the gripper 4 and the positioning blocks 1002. The drive mechanism 11, when the gripper 4 slides towards the center of the clamping disk 3, drives the positioning block 1002 to slide away from the center of the positioning ring 1001 via the drive mechanism 11. The drive mechanism 11 includes a drive slider 111 mounted on the gripper 4, a drive rod 112 slidably disposed on the positioning ring 1001, and a hinge rod 113 connecting the drive rod 112 and the positioning block 1002. The middle part of the hinge rod 113 is hinged to the top positioning ring 1001, and one end of the hinge rod 113 is hinged to the drive rod 112 in the length direction and the other end is hinged to the positioning block 1002. When the gripper 4 slides to clamp the pipe, the drive slider 111 slides against the drive rod 112 through the sliding of the gripper 4. The sliding of the drive rod 112 drives the hinge rod 113 to rotate. The rotation of the hinge rod 113 drives the positioning block 1002 to disengage from the pipe, thereby reducing the impact of the positioning mechanism on the pipe after the gripper 4 clamps and fixes it.

[0037] Reference Figure 1 , Figure 2 and Figure 5 The positioning ring 1001 is detachably mounted on the clamping jaw 4. A positioning insert 12 is fixed on the positioning ring 1001. A positioning slot 13 is opened at the bottom of the groove 9 corresponding to the positioning insert 12. The positioning insert 12 and the positioning slot 13 are used to make the positioning ring 1001 and the clamping disc 3 coaxially aligned. Both the positioning insert 12 and the positioning slot 13 are irregular shapes. The positioning insert 12 can only be inserted into the positioning slot 13 when the positioning block 1002 on the positioning ring 1001 is aligned with the clamping jaw 4. The support ring 52 is detachably mounted on the support platform 51. The support ring 52 is detachably mounted on the support platform 51 by bolts. With the detachability of the positioning ring 1001 and the support ring 52, the support ring 52 and the positioning ring 1001 are installed on the pipe before the pipe is installed, and the support block 53 and the positioning block 1002 are adjusted, which facilitates the subsequent installation of the pipe.

[0038] Reference Figure 1 , Figure 2and Figure 6 A slide groove 14 is formed along the length of the machine body 1. A drive block 15 is fixed on the machine head 2. The drive block 15 slides within the slide groove 14 via a rodless cylinder. A slider 16 is fixed on the support platform 51 and slides within the slide groove 14. A reinforcing mechanism 17 is provided on the slider 16. The reinforcing mechanism 17 includes an abutment block 171 and a reinforcing spring 172. The abutment block 171 is slidably disposed on the side wall of the slider 16. The reinforcing spring 172 is disposed between the abutment block 171 and the slider 16. The reinforcing spring 172 drives the abutment block 171 to abut against the side wall of the slide groove 14. A linkage block 18 is provided on the slider 16. The linkage block 18 is slidably disposed on the slider 16. A wedge-shaped surface is formed on the abutment block 171. The linkage block 18 abuts against... When the drive block 15 slides and impacts the linkage block 18 on the wedge surface, the linkage block 18 slides on the slider 16. The sliding of the linkage block 18 drives the abutment block 171 to slide away from the side wall of the slide groove 14 by abutting the wedge surface. The reinforcement mechanism 17 can reduce the probability of the support table 51 sliding when the pipe is fed. At the same time, when the machine head 2 slides close to the support table 51, it can drive the abutment block 171 to detach from the side wall of the slide groove 14 by abutting the linkage block 18, so that the machine head 2 can drive the abutment support table 51 to slide. When the support table 51 does not affect the sliding of the machine head 2, it reduces the probability of the pipe feeding driving the support table 51. When the support table 51 affects the machine head 2, it can be carried by the machine head 2 to slide, reducing the probability of the support table 51 restricting the movement of the machine head 2.

[0039] Reference Figure 1 , Figure 7 and Figure 8The CNC lathe 0 also has a slide groove 14. The machine body 1 is installed on the CNC lathe 0 so that the slide groove 14 on the machine body 1 is aligned with the slide groove 14 on the CNC lathe 0. A mounting device 19 is provided at the connection between the machine body 1 and the CNC lathe 0. The mounting device 19 includes mounting holes 191 and mounting blocks 192. The mounting holes 191 are located at both ends of the length direction of the CNC lathe 0, and the mounting blocks 192 are located at both ends of the length direction of the machine body 1. When the machine body 1 is connected to the CNC lathe 0, the mounting blocks 192 on the machine body 1 are inserted into the mounting holes 191 on the CNC lathe 0. At this time, the slide groove 14 on the machine body 1 and the slide groove 14 on the CNC lathe 0 are aligned. The slide groove 14 on the CNC lathe 0 is aligned; the mounting block 192 includes a connecting plate 1921 and an insertion plate 1922. The connecting plate 1921 is horizontally set on the machine body 1, and the insertion plate 1922 is integrally formed on the horizontal plate perpendicular to it. The size of the mounting hole 191 is the same as the size of the horizontal plate. A baffle 20 is provided at the opening of the positioning rod insertion hole. The baffle 20 is hinged on the CNC lathe 0. A torsion spring 21 is provided between the baffle 20 and the CNC lathe 0. The elastic force of the torsion spring 21 drives the baffle 20 to be vertically set at the opening of the mounting hole 191. A ratchet 22 is provided on the baffle 20. A pawl 23 engages with ratchet 22. The ratchet 22 and pawl 23 work together to restrict the baffle 20 from rotating away from the mounting hole 191. When the insertion plate 1922 enters the mounting hole 191, the insertion plate 1922 abuts against the baffle 20, driving the baffle 20 to rotate. After the baffle 20 rotates, the insertion plate 1922 enters the mounting hole 191. Then, the baffle 20 is reset by the elastic force of the torsion spring 21, thus preventing the insertion plate 1922 from disengaging from the mounting hole 191. The pawl 23 is slidably mounted on the CNC lathe 0 via an electric cylinder. The pawl 23 moves away from the ratchet 22, at which point the pawl 23 engages with the baffle. The restriction on the rotation of plate 20 is lifted, allowing plate 20 to rotate normally in the direction away from mounting hole 191. Insert plate 1922 can also be driven by abutting against plate 20 to rotate and disengage from mounting hole 191. At this time, machine body 1 can detach from CNC lathe 0. In this embodiment, when plate 20 rotates to a horizontal position, it is flush with the bottom of mounting hole 191, thereby reducing the impact of plate 20 on the disassembly and assembly of insert plate 1922. Mounting block 192 is slidably disposed on machine body 1 and is embedded in machine body 1 by sliding. Mounting hole 24 is provided on the insert plate 1922 of mounting block 192. Mounting hole 24 is a stepped hole used for countersunk bolts to fix mounting block 192 on machine body 1, and can also be used to grip and pull mounting block 192 to slide on machine body 1.

[0040] Reference Figure 3 and Figure 4The support ring 52 includes a lower half-ring 521 and an upper half-ring 522. The lower half-ring 521 is detachably installed on the support platform 51 by bolts, and the upper half-ring 522 is detachably installed on the lower half-ring 521. The upper half-ring 522 is installed on the lower half-ring 521 by an adjusting ring 73. In this embodiment, one support block 53 is provided on the upper half-ring 522, and two support blocks 53 are provided on the lower half-ring 521. By removing the upper plate ring, the support ring 52 can be used as a support to support the pipe, thereby facilitating the subsequent conveying of the pipe at the tail 102. The material guide and support component 5 can also be installed inside the CNC lathe 0. By removing the upper half ring 522, the impact on the tool can be reduced. The adjusting ring 73 can be used to adjust the position of the support block 53 and also to fix the upper half ring 522 and the lower half ring 521. The lower half ring 521 is equipped with fixing bolts. Tightening the fixing bolts can fix the position of the support block 53. Before removing the upper half ring 522, the support block 53 on the lower half ring 521 is fixed by tightening the fixing bolts to reduce the probability of the support block 53 slipping under force.

[0041] The implementation principle of this application embodiment is as follows: Support platforms 51 are evenly installed inside the machine body 1 and the CNC lathe 0. Support rings 52, which need to be installed inside the CNC lathe 0 and on the support platforms 51 at the tail 102, are fitted onto the pipe and adjusted according to the pipe's diameter. After adjustment, the upper half of the support ring 52, which needs to be installed inside the CNC lathe 0 and on the support platforms 51 at the tail 102, is disassembled and installed onto the support platforms 51 at the CNC lathe 0 and tail 102. The support rings 52 installed on the head 101 are then fitted onto the pipe. The support block 53 is placed on the pipe and its position is adjusted. At the same time, the positioning ring 1001 is installed on the pipe. Then, the positioning ring 1001 with the pipe is inserted into the groove 9, and the support ring 52 is aligned with the support table 51. After the support ring 52 is installed on the support table 51 with bolts, the pipe is clamped by the jaw 4. The thread cutter in the CNC lathe 0 is moved to a position close to the head 101 of the machine body 1. The clamping plate 3 is rotated by the motor and the machine head 2 is driven to slide by the rodless cylinder to process the external thread on the outer surface of the pipe.

[0042] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A pipe inlet center positioning device for a CNC pipe threading lathe, characterized in that: The system includes a body (1), on which a machine head (2) is provided. The machine head (2) slides along the length of the body (1). A clamping disc (3) is rotatably provided on the machine head (2). A gripper (4) is installed on the clamping disc (3). Several support components (5) are evenly arranged along the length of the body (1). Each support component (5) includes a support platform (51), a support ring (52), and support blocks (53). The support platform (51) is installed on the body (1). The support ring (52) is installed on the support platform (51). There are several support blocks (53). Several support blocks (53) slide synchronously within the support ring (52). The support blocks (53) face the center of the support ring (52). A support ball (6) is embedded at one end; a groove (9) is provided in the center of the clamping disk (3), and a positioning component (10) is provided in the groove (9). The positioning component (10) includes a positioning ring (1001), a positioning block (1002), and a positioning spring (1003). The positioning ring (1001) is installed on the clamping disk (3) in the groove (9). There are several positioning blocks (1002), and several positioning blocks (1002) are synchronously slidably disposed in the positioning ring (1001). Several positioning springs (1003) are provided corresponding to the positioning blocks (1002). The positioning springs (1003) are disposed between the positioning ring (1001) and the positioning blocks (1002). The elastic drive positioning block (1002) of 1003 slides toward the center of the positioning ring (1001); a drive mechanism (11) is provided between the gripper (4) and the positioning block (1002). The drive mechanism (11) includes a drive slider (111) mounted on the gripper (4), a drive rod (112) slidably disposed on the positioning ring (1001), and a hinge rod (113) connecting the drive rod (112) and the positioning block (1002). The middle part of the hinge rod (113) is hinged to the positioning ring (1001), and one end of the hinge rod (113) in the length direction is hinged to the drive rod (112) and the other end is hinged to the positioning block (1002). When the gripper (4) slides to clamp the pipe, the drive mechanism (111) moves to the center of the positioning ring (1001). The slider (111) slides through the gripper (4) to drive the abutment drive rod (112) to slide. The drive rod (112) slides to drive the hinge rod (113) to rotate. The hinge rod (113) rotates to drive the positioning block (1002) to detach from the pipe. The positioning ring (1001) is detachably mounted on the gripper (4) disk. The support ring (52) is detachably mounted on the support platform (51). The machine body (1) has a slide groove (14) along the length direction of the machine body (1). The machine head (2) is fixedly mounted with a drive block (15). The drive block (15) slides in the slide groove (14) through a cylinder. The support platform (51) is fixedly mounted with a slider (16). The slider (16) slides in the slide groove (14).

2. The CNC pipe threading lathe inlet center positioning device according to claim 1, characterized in that: An adjustment mechanism (7) is provided between the support ring (52) and the support block (53). The adjustment mechanism (7) includes an adjustment rod (71), an adjustment spring (72), and an adjustment ring (73). Several adjustment rods (71) are provided corresponding to the support blocks (53). Several adjustment rods (71) are respectively fixed on one end of several support blocks (53) facing the adjustment ring (73). The adjustment rods (71) slide through the support ring (52). The end of the adjustment rod (71) extending out of the support ring (52) has a chamfer. 8) The adjusting spring (72) is sleeved on the adjusting rod (71). One end of the adjusting spring (72) abuts against the inner wall of the support ring (52) and the other end abuts against the support block (53). The adjusting spring (72) drives the support block (53) to slide away from the center of the support ring (52) by elastic force. The adjusting ring (73) is threaded to the outer wall of the support ring (52). The adjusting ring (73) drives the adjusting rod (71) to slide closer to the center of the support ring (52) by rotating and abutting against the chamfer (8).

3. The CNC pipe threading lathe inlet center positioning device according to claim 2, characterized in that: The slider (16) is provided with a reinforcing mechanism (17), which includes an abutment block (171) and a reinforcing spring (172). The abutment block (171) is slidably disposed on the side wall of the slider (16), and the reinforcing spring (172) is disposed between the abutment block (171) and the slider (16). The reinforcing spring (172) drives the abutment block (171) to abut against the side wall of the groove (14).

4. The CNC pipe threading lathe inlet center positioning device according to claim 3, characterized in that: A linkage block (18) is provided on the slider (16). When the driving block (15) slides and hits the linkage block (18), the linkage block (18) slides on the slider (16). The sliding of the linkage block (18) causes the abutment block (171) to slide away from the side wall of the groove (14).

5. The CNC pipe threading lathe inlet center positioning device according to claim 4, characterized in that: The support ring (52) includes a lower half ring (521) and an upper half ring (522). The lower half ring (521) is detachably installed on the support platform (51), and the upper half ring (522) is detachably installed on the lower half ring (521). The upper half ring (522) is installed on the lower half ring (521) through an adjusting ring (73).

6. The CNC pipe threading lathe inlet center positioning device according to claim 5, characterized in that: The machine body (1) includes a head (101) and a tail (102), which are respectively located at both ends of the length direction of the CNC lathe (0).

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