A thread processing device and method for a tee joint

Abstract

This invention provides a device and method for machining internal threads of a tee pipe fitting, relating to the technical field of internal thread machining equipment. The invention includes a bottom support frame, with a fixing plate mounted on the upper end of the bottom support frame. A first mounting seat is fixedly mounted on the upper end of the fixing plate, and a second mounting seat, adjustable horizontally in the XY axis direction by a servo motor, is provided on the upper end of the fixing plate. A milling cutter is mounted on the second mounting seat. A limiting part is rotatably mounted on the side of the first mounting seat near the second mounting seat, wherein the limiting part can clamp and fix the tee to be machined. This invention adopts a double clamping and positioning structure of inner support and outer clamping. The inner support expands outward from the inside of the workpiece port to form an inner wall support, and the radial clamping arm, in conjunction with the clamping strip, clamps synchronously from the outer wall, ensuring that the tee to be machined and the turntable remain precisely coaxial, avoiding radial movement and eccentric rotation of the workpiece during machining.

Description

Technical Field

[0001] This invention relates to the field of internal thread processing equipment technology, and in particular to an internal thread processing equipment and method for a tee pipe joint. Background Technology

[0002] T-joints are core connectors used for branching and conversion in water supply, drainage, HVAC, and industrial piping systems. The internal thread at the port is a key structure for achieving a sealed connection. The coaxiality, tooth profile accuracy, and surface quality of the internal thread directly determine the joint's sealing performance, pressure resistance, and service life. Internal thread machining equipment is specialized equipment for cutting the internal threads of pipe fittings. It mainly consists of a workpiece clamping mechanism, a rotary drive mechanism, and a tool feed mechanism. During operation, the pipe fitting is fixed by the clamping mechanism, the workpiece is driven to rotate, and the cutting tool is fed according to a set lead to cut a continuous internal thread on the inner wall of the port. Currently, internal thread machining of tee joints often uses a simple external clamping structure, relying on jaws to clamp the pipe fitting from the outer wall for fixation. Because tees are multi-port irregular structures, a simple external clamp cannot guarantee the coaxiality of the port to be machined and the rotating spindle. Eccentricity and deflection easily occur during clamping, leading to quality defects such as internal thread coaxiality deviation, uneven tooth depth, and tooth profile misalignment after machining, directly affecting the connection and fit accuracy of the thread. Some equipment uses a single internal support positioning structure, which only supports the inner wall of the pipe from the inside of the port outward. Although it can ensure the roundness of the port to a certain extent, the clamping and anti-torsion ability is limited. During the thread cutting process, the workpiece is prone to circumferential slippage and radial movement under the action of tangential cutting force. This will not only reduce the forming accuracy of the thread, but also easily cause tool breakage. At the same time, the lack of external wall constraint makes it difficult to suppress cutting vibration, which easily forms vibration marks on the thread surface, reducing the surface finish and the quality of the finished product. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a device and method for machining the internal threads of a tee pipe joint.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a device for machining the internal thread of a tee pipe joint, comprising a bottom support frame, a fixing plate mounted on the upper end of the bottom support frame, a first mounting base fixedly mounted on the upper end of the fixing plate, and a second mounting base that can be adjusted horizontally in the XY axis direction by a servo motor. A milling cutter is mounted on the second mounting base, and a limiting part is rotatably mounted on the side of the first mounting base near the second mounting base. The limiting part can clamp and fix the tee to be machined, and the milling cutter can extend into the port of the tee to be machined. The feed amount is adjusted by rotating the tee to be machined in conjunction with the milling cutter to machine the internal thread.

[0005] Preferably, the limiting part includes a turntable and a radial clamping unit. The drive motor inside the first mounting base can drive the turntable to rotate. The radial clamping unit can be installed on the turntable. The radial clamping unit can clamp the surface of the tee to be processed to fix the tee to be processed and ensure stability when processing the internal thread. The turntable, driven by the drive motor, rotates in conjunction with the radial clamping unit to clamp the tee to be processed and make it rotate.

[0006] Preferably, the radial clamping unit includes a sliding seat fixed on the turntable, a track rod slidably connected inside the sliding seat, a radial clamping arm fixedly connected to one end of the track rod, and a synchronous drive unit provided on the turntable, wherein the synchronous drive unit can drive the two radial clamping arms to move closer to each other to clamp the tee to be processed.

[0007] Preferably, a positioning rod is fixedly connected to the surface of the turntable, wherein a track groove is formed on the surface of the adjusting rod, and the adjusting rod can slide on the surface of the positioning rod by means of the track groove to limit the sliding direction of the adjusting rod. A wedge is fixedly connected to one side of the adjusting rod, and a push plate is fixedly connected to the end of the track rod. A roller is rotatably installed on one side of the push plate, which can pull the adjusting rod so that the wedge on its surface squeezes the roller, thereby synchronously squeezing the roller to drive two radial clamping arms. The two radial clamping arms can be used to clamp and fix the tee to be processed. A clamping strip is fixedly connected inside the radial clamping arms, wherein the flexible radial clamping arms can be adapted to tees of different sizes to be processed, and the rigid clamping strip can abut against the surface of the tee to be processed to clamp it.

[0008] Preferably, the surface of the track rod is provided with a square groove, and a sliding column is fixedly connected inside the sliding seat. The track rod can slide along the sliding seat by passing through the sliding column via the square groove. A round rod is fixedly connected inside the square groove. The round rod slides through the sliding column to limit the sliding path of the track rod. A return spring is provided inside the square groove. The return spring is sleeved on the surface of the round rod. The two ends of the return spring are fixed to the sliding column and the square groove respectively. The elastic force of the return spring can be used to ensure that the track rod is reset.

[0009] Preferably, one end of the adjusting rod is fixedly connected to a driving arm, the internal thread of the driving arm passes through the adjusting screw, one end of the adjusting screw is rotatably mounted with a limiting plate, the limiting plate is fixedly mounted on the turntable, the adjustable screw can be rotated to drive the adjusting rod to synchronously drive two radial clamping arms, and two pressure plates are mounted on the surface of the positioning rod, which can be used to clamp the surface of the adjusting rod.

[0010] Preferably, the surface of the turntable is provided with a detachable inner support, wherein the inner support can be supported on the surface of the tee to be processed to fix and limit the tee to be processed.

[0011] Preferably, the inner support includes a fixed cylinder, which is detachably mounted on the turntable. The surface of the fixed cylinder is provided with a slidable and extendable support plate, wherein the support plate can be fixed inside the tee to be processed when it extends out of the fixed cylinder. The surface of the support plate is uniformly provided with anti-slip rubber pads to avoid rigid contact with the tee to be processed and to increase friction.

[0012] Preferably, the limiting plate has a buckle groove, and a limiting buckle is engaged inside the buckle groove. The limiting buckle and the fixed cylinder are fixed together. A spreading screw is rotatably installed inside the fixed cylinder. The spreading screw and the limiting buckle are rotatably installed. The threads at both ends of the spreading screw are in opposite directions. Drive blocks are mounted on the surfaces at both ends of the spreading screw. Rotating the spreading screw can drive the drive blocks to move synchronously in opposite directions inside the fixed cylinder. The two drive blocks are hinged together by a hinge arm and a spreading plate. When the two drive blocks move synchronously closer, the hinge arm can allow the spreading plate to extend out of the fixed cylinder and press against the inside of the tee to be processed. When the drive block moves synchronously away, the hinged arm allows the expansion plate to retract into the fixed cylinder. A vertical arm is fixedly connected to the surface of the turntable, and a fixing ring is locked inside the vertical arm. The fixing ring is fixed to the surface of the fixed cylinder. An assembly groove is opened inside the vertical arm, and a locking block is slidably connected inside the assembly groove. A clamping spring is fixedly connected between the locking block and the assembly groove. The elastic force of the clamping spring can drive the locking block to lock into the groove on the surface of the fixing ring. A pull rod is fixedly connected to the surface of the locking block. The pull rod slides through the assembly groove and extends out of the vertical arm. Pulling the pull rod can cause the locking block to squeeze the clamping spring to disengage from the groove and assemble with the locking block.

[0013] Preferably, a method for machining the internal thread of a tee pipe fitting is characterized by using the internal thread machining equipment for the tee pipe fitting as described in claim 9, and comprising the following steps: S1. Workpiece clamping: Place one end of the tee to be processed on the outside of the inner support. Rotate the expansion screw to drive the two drive blocks to move synchronously towards each other. The hinge arm pushes the expansion plate outward so that the anti-slip rubber pad presses against the inner wall of the tee to complete the inner support positioning. Then rotate the adjusting screw to drive the adjusting rod to move along the positioning rod. The wedge block squeezes the rollers on both sides to push the track rod to feed radially along the sliding seat, which drives the radial clamping arm and clamping bar to clamp the outer wall of the tee from the outside, thus completing the double fixation of the workpiece inside and outside. S2. Tool setting and calibration: The servo system drives the second mounting base to move in the XY axis plane, which in turn moves the milling cutter to the port of the tee to be machined. The radial depth of cut and the axial starting position of the milling cutter are adjusted so that the cutting edge of the milling cutter is aligned with the area to be machined on the inner wall of the port. S3. Cutting process: Start the drive motor inside the first assembly seat to drive the turntable and the tee to be processed to rotate at a constant speed. At the same time, the servo system controls the second assembly seat to feed axially at a constant speed along the thread lead. Through the relative rotational motion of the milling cutter and the tee, a continuous internal thread is formed on the inner wall of the port by cutting. S4. Retract cutter and stop rotation: After machining the internal thread of the single port to the set depth, the servo system drives the second mounting base to move the milling cutter axially backward and disengage it from the three-way port. The drive motor stops running, causing the turntable to stop rotating the workpiece. S5. Switch workstations, release the radial clamping arm and the inner support in sequence, turn the tee to be processed so that the remaining ports to be processed face the milling cutter side, repeat the clamping, tool setting, and cutting steps to complete the internal thread processing of the remaining ports of the tee; S6. Unloading and chip removal: After all ports are processed, rotate the adjusting screw and the spreading screw in the opposite direction to make the radial clamping arm and the spreading plate release the workpiece synchronously, remove the finished tee connector, and clean the processing debris inside the equipment and on the surface of the workpiece.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: 1. In this invention, a dual clamping and positioning structure with inner support and outer clamping is adopted. The inner support expands outward from the inside of the workpiece port to form an inner wall support. The radial clamping arm, together with the clamping bar, clamps synchronously from the outer wall, which can keep the tee to be processed and the turntable precisely coaxial, avoid radial movement and eccentric deflection of the workpiece during processing, improve the coaxiality and tooth profile accuracy of the internal thread. The anti-slip rubber pad on the inner support surface can avoid the workpiece inner wall crush caused by rigid support, while increasing the friction coefficient to improve clamping stability. The clamping bar can provide a stable rigid clamping force, suppress cutting vibration during processing, and reduce surface vibration marks on the thread.

[0015] 2. In this invention, a wedge-type synchronous drive clamping structure is adopted. A single adjusting screw can drive the adjusting rod to move axially. The inclined surface of the wedge blocks synchronously squeezes the rollers on both sides, driving the two sets of radial clamping arms to feed radially synchronously. It has good centering and uniform clamping force, which can avoid workpiece skewing caused by unilateral clamping and is suitable for tee workpieces with different outer diameter specifications.

[0016] 3. In this invention, a quick-release replaceable inner support module structure is adopted. The inner support part is engaged with the upright arm through a fixing ring. The locking is achieved by the clamping spring driving the card block to enter the card slot. Pulling the pull rod can quickly unlock and disassemble the module. When changing workpieces of different diameters, the corresponding size inner support module can be quickly replaced. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of an internal thread processing device and method for a tee pipe joint proposed in this invention; Figure 2This is a schematic diagram from another angle of the internal thread processing equipment and method for a tee pipe joint proposed in this invention; Figure 3 This is a partial schematic diagram of the limiting part in the internal thread processing equipment and method for a tee pipe joint proposed in this invention; Figure 4 This invention proposes a device and method for machining internal threads on a tee pipe joint. Figure 3 Partial schematic diagram; Figure 5 This is a partial schematic diagram of the adjusting rod in the internal thread processing equipment and method for a tee pipe joint proposed in this invention; Figure 6 This invention provides a schematic diagram of the internal structure of the fixed cylinder in a three-way pipe joint internal thread processing device and method. Figure 7 This invention proposes a device and method for machining internal threads on a tee pipe joint. Figure 3 Enlarged view of point A; Figure 8 This invention proposes a device and method for machining internal threads on a tee pipe joint. Figure 4 Enlarged view of point B.

[0018] Legend: 1. Bottom support frame; 2. Fixing plate; 3. First assembly seat; 4. Second assembly seat; 5. Milling cutter; 6. Limiting part; 61. Turntable; 62. Sliding seat; 63. Radial clamping arm; 64. Clamping bar; 65. Track rod; 66. Push plate; 67. Roller; 68. Adjusting rod; 69. Drive arm; 610. Adjusting screw; 611. Limiting plate; 612. Track groove; 613. Positioning rod; 614. Pressure plate; 61 5. Sliding column; 616. Round rod; 617. Return spring; 618. Square groove; 619. Wedge block; 7. Tee to be processed; 8. Inner support part; 81. Vertical arm; 82. Assembly groove; 83. Pull rod; 84. Anti-locking spring; 85. Locking block; 86. Locking groove; 87. Fixing ring; 88. Fixing cylinder; 89. Limit buckle; 810. Buckle groove; 811. Spreading screw; 812. Drive block; 813. Spreading plate; 814. Hinge arm. Detailed Implementation

[0019] Example 1, as Figure 1-8As shown, a device and method for machining the internal thread of a tee pipe joint includes a bottom support frame 1. A fixing plate 2 is horizontally fixedly installed on the upper end of the bottom support frame 1. A first mounting seat 3 is fixedly installed on one side of the upper end of the fixing plate 2, and a second mounting seat 4 is provided on the other side of the upper end of the fixing plate 2. The second mounting seat 4 is driven by a servo system and can move and adjust its position in the horizontal plane along the XY axis. A milling cutter 5 is installed on the side of the second mounting seat 4 facing the first mounting seat 3. A limiting part 6 is rotatably installed on the side of the first mounting seat 3 near the second mounting seat 4. The limiting part 6 can clamp and fix the tee 7 to be machined. During machining, the milling cutter 5 can extend into the port of the tee 7 to be machined. By relying on the rotational movement of the tee 7 to be machined and the feed amount of the milling cutter 5 is adjusted, the internal thread is cut and machined on the inner wall of the port. The limiting part 6 includes a turntable 61 and a radial clamping unit. A drive motor is installed inside the first mounting base 3. The output end of the drive motor is connected to the turntable 61 and can drive the turntable 61 to rotate at a constant speed around the axis. The radial clamping unit is installed on the end face of the turntable 61 and rotates together with the turntable 61. The radial clamping unit can clamp the surface of the tee 7 to be processed from the outside, firmly fixing the workpiece and ensuring the stability of the internal thread processing process. When the turntable 61 rotates under the drive motor, the tee 7 to be processed can be clamped by the radial clamping unit to complete the rotational movement synchronously. The radial clamping unit includes a sliding seat 62 fixedly installed on the end face of the turntable 61. A track rod 65 is slidably installed inside the sliding seat 62. A radial clamping arm 63 is fixedly connected to the end of the track rod 65 facing the center of the turntable. A synchronous drive unit is provided on the turntable 61. The synchronous drive unit can simultaneously drive the radial clamping arms 63 on both sides to move closer to each other radially, clamping the outer wall of the tee 7 to be processed from the outside. A positioning rod 613 is fixedly connected to the end face of the turntable 61. A track groove 612 is formed on the surface of the adjusting rod 68 along its length. The adjusting rod 68 can slide on the surface of the positioning rod 613 through the track groove 612, thereby limiting the sliding direction of the adjusting rod 68 to keep it straight. A wedge block 619 is fixedly connected to the side of the adjusting rod 68 facing the track rod 65. A push plate 66 is fixedly connected to the end of the track rod 65 away from the radial clamping arm 63. A roller 67 is rotatably installed on the side of the push plate 66 facing the wedge block 619, which pulls the adjusting rod axially. When 68 moves, the wedge 619 on the surface of the adjusting rod 68 can simultaneously squeeze the rollers 67 on both sides, and push the track rod 65 radially through the push plate 66, simultaneously driving the two radial clamping arms 63 to move towards each other and clamp on the outer wall surface of the tee to be processed to fix the workpiece on the outside. The inner side of the radial clamping arm 63 is fixedly connected with a clamping bar 64. The flexible radial clamping arm 63 can deform slightly to adapt to the tee to be processed with different outer diameters. The rigid clamping bar 64 can closely abut against the surface of the tee to be processed to provide a stable clamping force.A square groove 618 is provided on the upper surface of the track rod 65. A sliding column 615 is fixedly connected inside the sliding seat 62. The track rod 65 can slide smoothly along the sliding seat 62 through the square groove 618 and the sliding column 615. A round rod 616 is fixedly connected inside the square groove 618. The round rod 616 slides through the sliding column 615 to further limit the sliding path of the track rod 65 and avoid deflection and shaking. A return spring 617 is provided inside the square groove 618. The return spring 617 is sleeved on the surface of the round rod 616. The two ends of the return spring 617 are fixedly connected to the sliding column 615 and the inner wall of the square groove 618, respectively. The return spring 617 can drive the track rod 65 to slide outward and reset by means of the elastic force of the return spring 617, thereby driving the radial clamping arm 63 to automatically release the workpiece. One end of the adjusting rod 68 is fixedly connected to a drive arm 69. An adjusting screw 610 is threaded through the inside of the drive arm 69. A limit plate 611 is rotatably mounted on one end of the adjusting screw 610. The limit plate 611 is fixedly mounted on the end face of the turntable 61. Rotating the adjusting screw 610 can drive the adjusting rod 68 to move axially through the drive arm 69, synchronously driving the radial clamping arms 63 on both sides to complete the clamping and releasing actions. Two pressure plates 614 are mounted on the surface of the positioning rod 613. The two pressure plates 614 can clamp the surface of the adjusting rod 68, limiting the axial movement of the adjusting rod 68 and ensuring smooth sliding. A detachable inner support part 8 is provided at the center of the end face of the turntable 61. The inner support part 8 can extend into the port of the tee 7 to be processed and expand outward, supporting the workpiece from the inner wall side to form an auxiliary fixed limit. The inner support part 8 includes a fixed cylinder 88, which is detachably installed at the center of the end face of the turntable 61. The circumferential surface of the fixed cylinder 88 is provided with multiple expansion plates 813 that can slide out radially. When the expansion plates 813 extend outward from the fixed cylinder 88, they can abut against the inner wall of the tee 7 to be processed, thus supporting and fixing the workpiece from the inside. The outer surface of the expansion plates 813 is uniformly provided with anti-slip rubber pads, which can not only avoid rigid contact with the inner wall of the workpiece and cause damage to the pipe wall, but also increase the contact friction and improve the stability of the inner support fixation.A retaining groove 810 is provided at the center of the limiting plate 611. A retaining buckle 89 is fitted inside the retaining groove 810. The retaining buckle 89 is fixedly connected to the end of the fixed cylinder 88. A spreading screw 811 is rotatably installed inside the fixed cylinder 88 along the axis. The outer end of the spreading screw 811 is rotatably assembled with the retaining buckle 89. The threads at both ends of the spreading screw 811 are opposite in direction. A driving block 812 is respectively mounted on the surface of the rod at both ends of the spreading screw 811. When the spreading screw 811 is rotated, the two driving blocks 812 can be driven to move synchronously in opposite directions along the axis inside the fixed cylinder 88. The two driving blocks 812 are hinged to the corresponding spreading plates 813 through a hinge arm 814. When the two driving blocks 812 move synchronously towards each other, the hinge arm 814 can push the spreading plate 813 out of the fixed cylinder 88 to press against the inner wall of the tee 7 to be processed. When the two driving blocks 812 move synchronously away from each other, they can also move synchronously away from each other. When in motion, the hinged arm 814 can pull the expansion plate 813 to retract the fixed cylinder 88 and release the inner support limit. The end face of the turntable 61 is fixedly connected to the vertical arm 81. The vertical arm 81 is fitted with a fixing ring 87 inside. The fixing ring 87 is fixedly fitted on the outer surface of the fixed cylinder 88. The vertical arm 81 has an assembly groove 82 inside. The assembly groove 82 is slidably connected to the locking block 85 inside. The locking block 85 and the inner wall of the assembly groove 82 are fixedly connected to the clamping spring 84. The elastic force of the clamping spring 84 can drive the locking block 85 to be locked into the groove 86 on the surface of the fixing ring 87, so as to realize the quick locking and fixing of the fixed cylinder 88. The surface of the locking block 85 is fixedly connected to the pull rod 83. The pull rod 83 slides through the assembly groove 82 and extends outward from the vertical arm 81. Pulling the pull rod 83 outward can drive the locking block 85 to squeeze the clamping spring 84 to disengage from the groove 86, so that the inner support part 8 can be quickly removed for replacement and maintenance.

[0020] Working principle: When machining the internal thread of the tee pipe joint, first align one of the ports to be machined in the tee 7 with the inner support part 8 and insert it. Rotate the spreading screw 811 to drive the driving blocks 812 at both ends to move synchronously in opposite directions. Through the hinge arm 814, push each spreading plate 813 to extend radially outward, so that the anti-slip rubber pads on the surface of the spreading plate 813 are tightly pressed against the inner wall of the tee to complete the inner support positioning. Then, rotate the adjusting screw 610 to drive the driving arm 69 and the adjusting rod 68 to translate axially along the positioning rod 613. The wedge block 619 on the adjusting rod 68 simultaneously squeezes the rollers 67 on both sides, pushing the track rod 65 to feed radially inward along the sliding seat 62, driving the radial clamping arms 63 and the clamping bars 64 on both sides to clamp the outer wall of the tee from the outside. Through double fixing inside and outside, the workpiece is firmly clamped and there will be no deviation or loosening during the machining process. After clamping, the servo system drives the second mounting base 4 to move in the XY-axis plane, moving the milling cutter 5 to the position of the tee 7 to be machined. The radial depth of cut and axial starting position of the milling cutter 5 are finely adjusted to ensure the cutting edge of the milling cutter 5 is accurately aligned with the area to be machined on the inner wall of the port, completing the tool setting calibration. The drive motor inside the first mounting base 3 is then started, causing the turntable 61 and the clamped tee 7 to rotate uniformly around the axis. Simultaneously, the servo system controls the second mounting base 4 to feed axially at a uniform speed according to the thread lead. Through the relative movement of the milling cutter 5 and the rotating workpiece, continuous cutting is performed on the inner wall of the port to form an internal thread conforming to specifications. After the single-port internal thread is machined to the set depth, the servo system drives the second mounting base 4 to move the milling cutter 5 axially backward and disengage it from the tee port. The drive motor stops running, causing the turntable 61 to stop rotating the workpiece. Then, the adjusting screw 610 and the spreading screw 811 are rotated in the opposite direction. Under the elastic force of the return spring 617, the track rod 65 drives the radial clamping arm 63 to loosen outward. The spreading plate 813 retracts synchronously, and the fixed cylinder 88 releases the inner support limit. The tee 7 to be machined is turned so that the remaining ports to be machined face the milling cutter 5. The steps of clamping, tool setting, and cutting are repeated to complete the internal thread machining of the remaining ports of the tee in sequence. After all ports are processed, completely loosen the radial clamping arm 63 and the inner support part 8, remove the processed tee connector, and clean the remaining processing debris inside the equipment and on the surface of the workpiece to complete the entire processing process. When it is necessary to replace or maintain the inner support part 8, pull the pull rod 83 outward to drive the locking block 85 to compress the clamping spring 84 and disengage it from the slot 86. Then, the fixed cylinder 88 together with the fixed ring 87 can be pulled out from the vertical arm 81 to complete the disassembly. When installing, insert the fixed ring 87 into the vertical arm 81, loosen the pull rod 83, clamp the spring 84, and push the locking block 85 into the slot 86 to complete the quick locking.

[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may utilize the disclosed technical content to make changes or modifications to create equivalent embodiments applicable to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, still fall within the protection scope of the present invention. In the description of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood through specific circumstances.

Claims

1. A device for machining the internal thread of a tee pipe joint, comprising a bottom support frame (1), characterized in that: A fixing plate (2) is installed on the upper end of the bottom support frame (1). A first mounting seat (3) is fixedly installed on the upper end of the fixing plate (2). A second mounting seat (4) is provided on the upper end of the fixing plate (2) and can be adjusted in the horizontal direction by a servo in the XY axis direction. A milling cutter (5) is installed on the second mounting seat (4). A limiting part (6) is rotatably installed on the side of the first mounting seat (3) close to the second mounting seat (4). The limiting part (6) can clamp and fix the tee (7) to be processed. The milling cutter (5) can be inserted into the port of the tee (7) to be processed. The feed amount is adjusted by rotating the tee (7) to be processed in conjunction with the milling cutter (5) to process the internal thread.

2. The internal thread processing equipment for the tee pipe joint according to claim 1, characterized in that: The limiting part (6) includes a turntable (61) and a radial clamping unit. The drive motor inside the first mounting base (3) can drive the turntable (61) to rotate. The radial clamping unit can be installed on the turntable (61). The radial clamping unit can clamp the surface of the tee to be processed (7) to fix the tee to be processed (7) to ensure stability when processing the internal thread. The turntable (61) rotates under the drive of the drive motor and cooperates with the radial clamping unit to clamp the tee to be processed (7) to make it rotate.

3. The internal thread processing equipment for the tee pipe joint according to claim 2, characterized in that: The radial clamping unit includes a sliding seat (62) fixed on a turntable (61). A track rod (65) is slidably connected inside the sliding seat (62). A radial clamping arm (63) is fixedly connected to one end of the track rod (65). A synchronous drive unit is provided on the turntable (61), wherein the synchronous drive unit can drive two radial clamping arms (63) to move closer to each other to clamp the tee (7) to be processed.

4. The internal thread processing equipment for the tee pipe joint according to claim 3, characterized in that: A positioning rod (613) is fixedly connected to the surface of the turntable (61). A track groove (612) is provided on the surface of the adjusting rod (68). The adjusting rod (68) can slide on the surface of the positioning rod (613) by means of the track groove (612) to limit the sliding direction of the adjusting rod (68). A wedge (619) is fixedly connected to one side of the adjusting rod (68). A push plate (66) is fixedly connected to the end of the track rod (65). A roller (67) is rotatably installed on one side of the push plate (66) and can pull... Pull the adjusting rod (68) so that the wedge (619) on its surface squeezes the roller (67) and then simultaneously squeezes the roller (67) to drive the two radial clamping arms (63). The two radial clamping arms (63) can be used to clamp and fix the tee (7) to be processed. The radial clamping arms (63) are fixedly connected to the inside of the clamping bars (64). The flexible radial clamping arms (63) can be adapted to different sizes of tees (7) to be processed. The rigid clamping bars (64) can be pressed against the surface of the tee (7) to be processed and clamp it.

5. The internal thread processing equipment for the tee pipe joint according to claim 4, characterized in that: The track rod (65) has a square groove (618) on its surface. A sliding column (615) is fixedly connected inside the sliding seat (62). The track rod (65) can slide along the sliding seat (62) by passing through the sliding column (615) through the square groove (618). A round rod (616) is fixedly connected inside the square groove (618). The round rod (616) slides through the sliding column (615) to limit the sliding path of the track rod (65). A return spring (617) is provided inside the square groove (618). The return spring (617) is sleeved on the surface of the round rod (616). The two ends of the return spring (617) are fixed to the sliding column (615) and the square groove (618) respectively. The return spring (617) can be used to ensure that the track rod (65) is reset.

6. The internal thread processing equipment for a tee pipe joint according to claim 5, characterized in that: One end of the adjusting rod (68) is fixedly connected to a driving arm (69). The internal thread of the driving arm (69) passes through the adjusting screw (610). One end of the adjusting screw (610) is rotatably mounted with a limiting plate (611). The limiting plate (611) is fixedly mounted on the turntable (61). The adjustable screw (610) can be rotated to drive the adjusting rod (68) to drive two radial clamping arms (63) synchronously. Two pressure plates (614) are mounted on the surface of the positioning rod (613). The two pressure plates (614) can be used to clamp the surface of the adjusting rod (68).

7. The internal thread processing equipment for a tee pipe joint according to claim 6, characterized in that: The surface of the turntable (61) is provided with a detachable inner support (8), wherein the inner support (8) can be supported on the surface of the tee to be processed (7) to fix and limit the tee to be processed (7).

8. The internal thread processing equipment for a tee pipe joint according to claim 7, characterized in that: The inner support (8) includes a fixed cylinder (88), which is detachably mounted on the turntable (61). The surface of the fixed cylinder (88) is provided with a slidingly extendable support plate (813). When the support plate (813) extends out of the fixed cylinder (88), it can be pressed against the inside of the tee to be processed (7) to fix it. The surface of the support plate (813) is uniformly provided with anti-slip rubber pads to avoid rigid contact with the tee to be processed (7) and to increase friction.

9. The internal thread processing equipment for a tee pipe joint according to claim 8, characterized in that: The limiting plate (611) has a buckle groove (810), and a limiting buckle (89) is locked inside the buckle groove (810). The limiting buckle (89) is fixed to the fixing cylinder (88). A spreading screw (811) is rotatably installed inside the fixing cylinder (88). The spreading screw (811) and the limiting buckle (89) are rotatably installed. The threads at both ends of the spreading screw (811) are opposite in direction. The surfaces at both ends of the spreading screw (811) are fitted with driving devices. The drive block (812) can be driven to move synchronously in opposite directions inside the fixed cylinder (88) while rotating the screw (811). The two drive blocks (812) are hinged together by a hinge arm (814) and a support plate (813). When the two drive blocks (812) move closer together, the support plate (813) can be pushed out of the fixed cylinder (88) and pressed against the inside of the tee (7) to be processed by the hinge arm (814). When moving synchronously away from the target, the hinged arm (814) can be used to retract the expansion plate (813) into the fixed cylinder (88). The surface of the turntable (61) is fixedly connected to the vertical arm (81). The vertical arm (81) has a fixing ring (87) inside, which is fixed to the surface of the fixed cylinder (88). The vertical arm (81) has an assembly groove (82) inside, and a locking block (85) is slidably connected inside the assembly groove (82). A retaining spring (84) is fixedly connected between the mounting groove (82) and the mounting slot (82). The elastic force of the retaining spring (84) can drive the locking block (85) to engage in the slot (86) on the surface of the fixing ring (87). A pull rod (83) is fixedly connected to the surface of the locking block (85). The pull rod (83) slides through the mounting groove (82) and extends out into the upright arm (81). The pull rod (83) can be pulled to make the locking block (85) squeeze the retaining spring (84) to disengage from the mounting slot (86).

10. A method for machining the internal thread of a tee pipe fitting, characterized in that: The internal thread processing equipment for the tee pipe fitting as described in claim 9 includes the following steps: S1. Workpiece clamping: Place one end of the tee (7) to be processed on the outside of the inner support (8), rotate the opening screw (811) to drive the two end drive blocks (812) to move synchronously towards each other, push the opening plate (813) outward through the hinge arm (814) so ​​that the anti-slip rubber pad presses against the inner wall of the tee to complete the inner support positioning, then rotate the adjusting screw (610) to drive the adjusting rod (68) to move along the positioning rod (613), the wedge block (619) squeezes the rollers (67) on both sides to push the track rod (65) to feed radially along the sliding seat (62), and drive the radial clamping arm (63) and clamping bar (64) to clamp the outer wall of the tee from the outside to complete the double fixation of the workpiece inside and outside; S2. Tool calibration: The servo system drives the second mounting base (4) to move in the XY axis plane, which in turn moves the milling cutter (5) to the port of the tee (7) to be machined. The radial cutting depth and axial starting position of the milling cutter (5) are adjusted so that the cutting edge of the milling cutter (5) is aligned with the area to be machined on the inner wall of the port. S3. Cutting process: Start the drive motor inside the first assembly seat (3) to drive the turntable (61) and the clamped tee (7) to rotate at a constant speed. At the same time, the servo system controls the second assembly seat (4) to feed axially at a constant speed along the thread lead. Through the relative rotational motion of the milling cutter (5) and the tee, a continuous internal thread is formed on the inner wall of the port. S4. Retract the cutter and stop rotating. After machining the single-port internal thread to the set depth, the servo system drives the second mounting base (4) to drive the milling cutter (5) to retract axially and disengage from the three-way port. The drive motor stops running, causing the turntable (61) to stop rotating the workpiece. S5. Switch workstations, release the radial clamp (63) and the inner support (8) in sequence, turn the tee to be processed (7) so that the remaining ports to be processed face the milling cutter (5), repeat the clamping, tool setting and cutting steps to complete the internal thread processing of the remaining ports of the tee; S6. Unloading and chip removal: After all ports are processed, rotate the adjusting screw (610) and the spreading screw (811) in the opposite direction so that the radial clamping arm (63) and the spreading plate (813) can release the workpiece synchronously, remove the finished tee connector, and clean the processing debris inside the equipment and on the surface of the workpiece.

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