Internal thread machining device for PVC pipe joint

Abstract

The invention relates to the technical field of pipe fittings, in particular to a PVC pipe joint internal thread machining device which comprises a base, a vertical plate and a controller, the vertical plate is installed in the middle of the upper surface of the base, a reinforcing rib is further installed between the right side wall of the vertical plate and the upper surface of the base, the stability of the vertical plate is improved, and the controller is installed on the outer wall of the vertical plate. A plurality of transverse rods are installed on the left side of the vertical plate in the circumferential direction at equal intervals, movable bases are slidably connected to the outer walls of the transverse rods, hydraulic oil cylinders electrically connected with the controller are installed on the top of the right side wall of the vertical plate, and the hydraulic oil cylinders drive the movable bases to move left and right. The limitation that traditional equipment can only machine straight-through connectors is thoroughly overcome, the internal thread machining device can be matched with internal thread machining of various PVC connectors such as elbows and special-shaped connectors, the application range of the device is greatly expanded, the tedious manual tool setting step in traditional machining is omitted, manual operation errors are reduced, the remodeling machining time is remarkably shortened, and the machining efficiency is improved. And the production efficiency and the thread machining precision of the PVC joint are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting processing technology, specifically to a device for processing internal threads of PVC pipe joints. Background Technology

[0002] PVC pipe fittings are key components in pipeline systems and are widely used in various fluid transportation scenarios. They mainly undertake the core functions of connecting pipelines and changing pipeline routes. Their connection methods include heat fusion connection, flange connection, and internal and external thread connection. Among them, internal and external thread PVC fittings are particularly widely used in industrial production and civil construction due to their convenient connection and good sealing performance.

[0003] To achieve the threaded connection function of PVC pipe fittings, internal threads need to be machined using specialized thread processing equipment. Existing thread processing equipment mainly consists of a clamping system, a moving system, and a turning system. Its working principle is as follows: the clamping system positions and fixes the PVC fitting, and then the moving system drives the cutting tool to approach the fitting, working in conjunction with the turning system to complete the turning of the internal thread. However, existing processing equipment suffers from numerous technical defects in practical applications, making it difficult to meet diverse processing needs: First, the fixture system and turning system are designed independently. Threading can only be completed when the opening to be processed on the PVC pipe fitting is aligned with the cutting tool in the same direction. This limits the equipment to straight-through fittings. For non-straight-through PVC fittings such as elbows and irregular shapes, precise alignment between the opening and the cutting tool is impossible, hindering effective processing. Second, PVC pipe fittings come in various sizes and specifications. Switching between different outer diameters and models requires manual adjustment of the cutting tool position for tool setting. This process is not only time-consuming and labor-intensive but also prone to errors due to human intervention, significantly reducing production efficiency. Third, different application scenarios require different thread depths for PVC pipe fittings. Existing equipment lacks an effective thread depth adjustment mechanism, making it impossible to flexibly adjust the processing depth according to the actual use of the fitting. This often results in weak pipe connections and poor sealing performance when the thread depth is too shallow, or damage to the fitting body when the thread depth is too deep, severely affecting the overall stability and service life of the pipeline system. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of existing methods that cannot complete the thread processing of various types of PVC joints, the time-consuming and labor-intensive manual tool setting, and the difficulty in adjusting the thread processing depth.

[0005] This invention achieves the above-mentioned objective through the following technical solution: a device for processing internal threads of PVC pipe joints, comprising a base, a vertical plate, and a controller. The vertical plate is installed in the middle of the upper surface of the base, and a reinforcing rib is installed between the right side wall of the vertical plate and the upper surface of the base to improve the stability of the vertical plate. The controller is installed on the outer wall of the vertical plate. Several crossbars are equidistantly installed along the circumferential direction on the left side of the vertical plate. A movable seat is slidably connected to the outer wall of each crossbar. A hydraulic cylinder electrically connected to the controller is installed at the top of the right side wall of the vertical plate, driving the movable seat to move left and right. A lifting device is installed inside the movable seat. A thread depth adjustment mechanism is installed at the moving end of the lifting device. A cutting tool is installed at the bottom end of the thread depth adjustment mechanism, controlling the cutting depth of the cutting tool. A rotating mechanism is installed at the left end of the crossbars, and a positioning mechanism is installed at the left end of the rotating mechanism. An adaptive selection mechanism is installed on the outer wall of the positioning mechanism, driving the positioning mechanism to move. The positioning mechanism centers and clamps the PVC joint, and subsequently, the rotating mechanism drives the positioning mechanism to rotate.

[0006] Specifically, the thread depth adjustment mechanism includes a limiting component that is horizontally installed on the moving end of the lifting device. A first driver that is electrically connected to the controller is installed on the rear side of the limiting component. A first limit switch that is electrically connected to the controller is installed on the left end of the limiting component. The first driver drives the limiting component to move the first limit switch.

[0007] Specifically, the limiting component includes a box that is horizontally installed on the moving end of the lifting device. The lower surface of the box is mounted with a cutting tool. A slide rod is horizontally inserted into the inner cavity of the box. The left end of the slide rod is mounted with a first limit switch. Several teeth that mesh with a first driver are installed on the rear side of the slide rod from left to right. Through the transmission between the first driver and the teeth, the slide rod drives the first limit switch to move left and right. A contact is installed at the front end of the slide rod. An insulator is horizontally installed on the left side of the inner cavity of the box. A resistance wire that is electrically connected to the controller is wound around the outer wall of the insulator, and the contact is in contact with the resistance wire. It can not only drive the first limit switch to move, but also has the function of recognizing the movement distance.

[0008] Specifically, the rotating mechanism includes a dust cover installed on the left end of the crossbar, a second driver electrically connected to the controller is installed on the right side wall of the dust cover, a rotatable support is installed inside the dust cover, and a first external gear ring meshing with the second driver is installed on the outer wall of the support. The support can be rotated by the transmission between the second driver and the first external gear ring. It provides rotational power to the PVC connector, and works with the cutting tool to complete the thread turning operation.

[0009] Specifically, the positioning mechanism includes a base installed on the left side wall of the support. Three sliders are inserted circumferentially on the inner side of the base. A curved clamping plate is installed on the inner side of the slider to increase the contact area between the clamping plate and the PVC joint and avoid excessive pressure during clamping that could damage the PVC joint. An insert rod is installed on the outer side of the left side wall of the slider. A second external toothed ring is installed in the inner cavity of the base through a bearing. Several guide grooves are opened circumferentially on the left side wall of the second external toothed ring, and the insert rod is inserted into the inner cavity of the guide groove. The centripetal motion of the clamping plate is used to center and hold the PVC joint, preventing quality problems during machining.

[0010] Specifically, several of the guide grooves are distributed clockwise on the outer wall of the second outer toothed ring.

[0011] Specifically, the adaptive selection mechanism includes a control box installed on the outer wall of the base, a guide rod vertically installed inside the control box, a lifting seat slidably connected to the outer wall of the guide rod, a cylinder electrically connected to the controller installed on the lower surface of the control box, the cylinder being able to drive the lifting seat to rise and fall, a rack meshing with a second external gear ring installed on the rear side of the lifting seat, and several second limit switches electrically connected to the controller installed from top to bottom on the front side of the inner cavity of the control box. It not only serves as a positioning mechanism drive, but also automatically identifies the outer diameter of the PVC connector, so that the cutting tool can be automatically set.

[0012] Specifically, the upper and lower corners of the front end of the lifting seat are chamfered.

[0013] Specifically, a time-delay relay is provided between the second limit switch and the controller.

[0014] The beneficial effects of this invention are: 1. This invention utilizes a linkage design between an adaptive selection mechanism and a positioning mechanism. When the cylinder drives the lifting seat to rise, the rack and the second external gear ring mesh, causing the second external gear ring to rotate. The guide grooves on its outer wall, which are inclined, generate relative motion with the insert rod on the slider, forcing the clamping plate to move synchronously towards the center, thus achieving centering and clamping of the PVC joint. It can precisely position the opening of the joint to be processed, ensuring it remains horizontally aligned with the cutting tool. This completely solves the limitation of traditional equipment that can only process straight-through joints, and can adapt to the internal thread processing of various PVC joints such as elbows and irregular shapes, significantly expanding the applicability of the equipment.

[0015] 2. During the centering and clamping of the PVC connector by the clamping plate, the rising of the lifting seat triggers the second limit switch at the corresponding height. Combined with the signal filtering function of the time-delay relay, the controller can accurately identify the outer diameter of the connector based on the electrical signal fed back by the second limit switch. Subsequently, the controller automatically controls the lifting device to move the cutting tool to the specified machining height, completing the automatic tool setting operation. This eliminates the tedious manual tool setting steps in traditional machining, not only reducing human error but also significantly shortening changeover time, effectively improving the production efficiency and thread machining accuracy of PVC connectors.

[0016] 3. The thread depth adjustment mechanism is driven by the meshing of the teeth on the slide rod with the first driver, which drives the slide rod to move the first limit switch left and right. At the same time, the contact at the front end of the slide rod keeps in contact with the resistance wire on the insulator. The controller can accurately identify the movement distance of the first limit switch according to the resistance change of the resistance wire. As a control switch for the turning depth, the first limit switch can flexibly adjust the thread processing depth according to the actual use of the PVC joint, avoiding the problems of loose connection or joint damage caused by the non-adjustable depth of traditional equipment. This not only ensures the connection stability of the pipeline system, but also extends the service life of the PVC joint. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a perspective view of the lifting device of the present invention; Figure 4 This is a perspective view of the thread depth adjustment mechanism of the present invention; Figure 5 This is a top view of the limiting component of the present invention; Figure 6 This is a left view of the rotating mechanism of the present invention; Figure 7 This is a left view of the positioning mechanism of the present invention; Figure 8 This is the right view of the adaptive selection mechanism of the present invention.

[0018] In the diagram: 1. Base; 2. Vertical plate; 3. Controller; 4. Crossbar; 5. Moving seat; 6. Hydraulic cylinder; 7. Lifting device; 8. Thread depth adjustment mechanism; 9. Cutting tool; 10. Rotation mechanism; 11. Positioning mechanism; 12. Adaptive selection mechanism; 81. Limiting component; 82. First driver; 83. First limit switch; 811. Housing; 812. Slide rod; 813. Tooth; 814. Contact; 815. Insulator; 816. Resistance wire; 101. Dust cover; 102. Second driver; 103. Support; 104. First external toothed ring; 111. Base; 112. Slider; 113. Clamping plate; 114. Insert rod; 115. Second external toothed ring; 116. Guide groove; 121. Control box; 122. Guide rod; 123. Lifting seat; 124. Cylinder; 125. Rack; 126. Second limit switch. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of the present invention easier to understand, the preferred embodiments of the present invention are further described below in conjunction with specific embodiments and accompanying drawings.

[0020] Please see Figures 1-8 This invention provides a device for processing internal threads of PVC pipe fittings, including a base 1, a vertical plate 2, and a controller 3. The vertical plate 2 is installed in the middle of the upper surface of the base 1, and a reinforcing rib is installed between the right side wall of the vertical plate 2 and the upper surface of the base 1 to improve the stability of the vertical plate 2. The controller 3 is installed on the outer wall of the vertical plate 2. Several crossbars 4 are installed at equal intervals along the circumference on the left side of the vertical plate 2. A movable seat 5 is slidably connected to the outer wall of the crossbars 4. A hydraulic cylinder 6 electrically connected to the controller 3 is installed on the top of the right side wall of the vertical plate 2, and the movable seat 5 is moved left and right by the hydraulic cylinder 6. A lifting device 7 is installed inside the movable seat 5. A thread depth adjustment mechanism 8 is installed at the moving end of the lifting device 7. A cutting tool 9 is installed at the bottom of the thread depth adjustment mechanism 8. The thread depth adjustment mechanism 8 controls the cutting depth of the cutting tool 9. A rotating mechanism 10 is installed at the left end of the crossbar 4. A positioning mechanism 11 is installed at the left end of the rotating mechanism 10. An adaptive selection mechanism 12 is installed on the outer wall of the positioning mechanism 11. The adaptive selection mechanism 12 drives the positioning mechanism 11 to move. The positioning mechanism 11 centers and clamps the PVC joint. Subsequently, the rotating mechanism 10 drives the positioning mechanism 11 to rotate.

[0021] As a preferred embodiment, the thread depth adjustment mechanism 8 further includes a limit component 81 that is horizontally installed on the moving end of the lifting device 7. A first driver 82 that is electrically connected to the controller 3 is installed on the rear side of the limit component 81. A first limit switch 83 that is electrically connected to the controller 3 is installed on the left end of the limit component 81. The first driver 82 drives the limit component 81 to move the first limit switch 83. The first driver 82 consists of a servo motor and gears, and serves as the working power for the limit component 81.

[0022] As a preferred embodiment, the limiting assembly 81 further includes a housing 811 horizontally mounted on the moving end of the lifting device 7. The lower surface of the housing 811 is mounted to the cutting tool 9. A slide rod 812 is horizontally inserted into the inner cavity of the housing 811. The slide rod 812 is rectangular to prevent rotation. The left end of the slide rod 812 is mounted to the first limit switch 83. Several teeth 813 that mesh with the first driver 82 are mounted from left to right on the rear side of the slide rod 812. The first driver 82 and the teeth... The 813 transmission causes the slide bar 812 to move the first limit switch 83 left and right. The front end of the slide bar 812 is equipped with a contact 814. An insulator 815 is horizontally installed on the left side of the inner cavity of the housing 811. A resistance wire 816 electrically connected to the controller 3 is wound around the outer wall of the insulator 815. The contact 814 is in contact with the resistance wire 816. When the contact 814 moves, the length of the resistance wire 816 changes, which in turn changes the resistance. The movement distance of the first limit switch 83 is identified based on the change in resistance.

[0023] As a preferred embodiment, the rotating mechanism 10 further includes a dust cover 101 installed at the left end of the crossbar 4. A second driver 102 electrically connected to the controller 3 is installed on the right side wall of the dust cover 101. A rotatable support 103 is installed inside the dust cover 101. The support 103 gives the positioning mechanism 11 the ability to rotate. A first external gear ring 104 that meshes with the second driver 102 is installed on the outer wall of the support 103. The support 103 can be rotated by the transmission between the second driver 102 and the first external gear ring 104. The second driver 102 consists of a servo motor and gears, which serve as the rotational power for the first external gear ring 104.

[0024] As a preferred embodiment, the positioning mechanism 11 further includes a base 111 mounted on the left side wall of the support 103. Three sliders 112 are circumferentially inserted into the inner side of the base 111, with the extended centerline of each slider 112 pointing towards the center of the base 111. This allows the sliders 112 to drive the clamping plate 113 to move centripetally. The sliders 112 are rectangular in shape, which also improves the stability of the clamping plate 113. A curved clamping plate 113 is mounted on the inner side of the sliders 112, increasing the contact area between the clamping plate 113 and the PVC connector, preventing excessive pressure from damaging the PVC connector during clamping. The outer side of the left side wall of the sliders 112... A rod 114 is mounted on the side. The rod 114 is cylindrical in shape. When the rod 114 slides relative to the guide groove 116, the angle can change. A second external toothed ring 115 is installed in the inner cavity of the base 111 through a bearing. Several guide grooves 116 are opened circumferentially on the left side wall of the second external toothed ring 115, and the rod 114 is inserted into the inner cavity of the guide groove 116. Several guide grooves 116 are distributed clockwise on the outer wall of the second external toothed ring 115. When the second external toothed ring 115 rotates, the guide grooves 116 can press the rod 114 inward or outward, so that the clamping plates 113 move closer or further apart.

[0025] As a preferred embodiment, the adaptive selection mechanism 12 further includes a control box 121 mounted on the outer wall of the base 111. A guide rod 122 is vertically mounted inside the control box 121. A lifting seat 123 is slidably connected to the outer wall of the guide rod 122. The guide rod 122 restricts the movement direction of the lifting seat 123. The upper and lower corners of the front end of the lifting seat 123 are chamfered so that the second limit switch can be triggered when the lifting seat 123 rises and falls. A cylinder 124 electrically connected to the controller 3 is mounted on the lower surface of the control box 121. The cylinder 124 can drive the lifting seat 123 to rise and fall. A rack 125 meshing with the second external gear ring 115 is mounted on the rear side of the lifting seat 123. Several second limit switches 126 electrically connected to the controller 3 are mounted from top to bottom on the front side of the inner cavity of the control box 121. A time delay relay is provided between the second limit switch 126 and the controller 3. When the lifting seat 123 passes the second limit switch 126, the time delay relay will not reach the set time to prevent the feedback electrical signal to the controller 3 from being confused.

[0026] Working principle: Step 1: Place the PVC connector between the clamps 113. Use the controller 3 to make the cylinder 124 drive the lifting seat 123 to rise. Although the lifting seat 123 will trigger the second limit switch 126 during the movement, the time has not reached the time set by the delay relay, so it will not feed the electrical signal back to the controller 3. During the upward movement of the rack 125, the second outer toothed ring 115 rotates, and the guide groove 116 uses its own inclined surface to press the insert rod 114 inward, thereby causing the slider 112 to drive the clamping plate 113 to move along the center of the base 111 to center and clamp the PVC joint. Step 2: When the PVC connector is centered and clamped, the lifting seat 123 triggers the second limit switch 126 at the same height, and the time delay relay sends an electrical signal back to the control machine 3. According to the electrical signal fed back by the second limit switch 126 at different positions, the controller 3 determines the outer diameter of the PVC connector. The controller 3 causes the lifting device 7 to drive the thread depth adjustment mechanism 8 and the cutting tool 9 to rise to the specified height, and automatically aligns the tool according to the outer diameter of the PVC pipe. Step 3: The hydraulic cylinder 6 pushes the moving seat 5 to slide to the left along the crossbar 4, allowing the cutting tool 9 to gradually move towards the PVC connector. At the same time, the second driver 102 drives the first external gear ring 104 to rotate, causing the base 111 to rotate the PVC connector, and the cutting tool 9 cuts out the internal thread of the PVC connector. Step 4: As the cutting tool 9 gradually approaches the PVC connector, the first limit switch 83 will be triggered by the PVC connector. After the controller 3 receives the electrical signal from the first limit switch 83, the lifting device 7 will move the cutting tool 9 away from the PVC connector, and the hydraulic cylinder 6 will pull the cutting tool 9 to the right to retract. At the same time, the second driver 102 will stop working. Cylinder 124 drives rack 125 to descend, second outer gear ring 115 rotates, guide groove 116 presses the insert rod 114 outward at an angle, causing clamp 113 to move outward to loosen PVC joint, thus completing automatic thread processing of PVC joint. Step 5: When it is necessary to adjust the thread processing depth of the PVC connector, the slide bar 812 is moved to the left or right by the transmission of the first driver 82 and the tooth 813. During this process, the contact point 814 and the resistance wire 816 change. According to the change in the resistance of the resistance wire 816, the controller 3 determines the moving distance of the first limit switch 83 to adjust the thread processing depth.

[0027] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A device for processing internal threads of PVC pipe joints, comprising a base (1), a vertical plate (2), and a controller (3), wherein the vertical plate (2) is installed in the middle of the upper surface of the base (1), and a reinforcing rib is installed between the right side wall of the vertical plate (2) and the upper surface of the base (1) to improve the stability of the vertical plate (2), and the controller (3) is installed on the outer wall of the vertical plate (2), characterized in that, Several crossbars (4) are equidistantly installed on the left side of the upright plate (2) along the circumference. A movable seat (5) is slidably connected to the outer wall of the crossbars (4). A hydraulic cylinder (6) electrically connected to the controller (3) is installed on the top of the right side wall of the upright plate (2). The movable seat (5) is driven to move left and right by the hydraulic cylinder (6). A lifting device (7) is installed on the inner side of the movable seat (5). A thread depth adjustment mechanism (8) is installed on the moving end of the lifting device (7). A cutting tool (9) is installed at the bottom end of the thread depth adjustment mechanism (8). The thread depth adjustment mechanism (8) controls the cutting depth of the cutting tool (9). A rotating mechanism (10) is installed on the left end of the crossbar (4). A positioning mechanism (11) is installed on the left end of the rotating mechanism (10). An adaptive selection mechanism (12) is installed on the outer wall of the positioning mechanism (11). The adaptive selection mechanism (12) drives the positioning mechanism (11) to move. The positioning mechanism (11) centers and clamps the PVC joint. Then the rotating mechanism (10) drives the positioning mechanism (11) to rotate.

2. The internal thread processing device for PVC pipe joints according to claim 1, characterized in that, The thread depth adjustment mechanism (8) includes a limiting component (81) that is horizontally installed on the moving end of the lifting device (7). A first driver (82) electrically connected to the controller (3) is installed on the rear side of the limiting component (81). A first limit switch (83) electrically connected to the controller (3) is installed on the left end of the limiting component (81). The first driver (82) drives the limiting component (81) to move the first limit switch (83).

3. The internal thread processing device for PVC pipe joints according to claim 2, characterized in that, The limiting component (81) includes a box (811) horizontally installed on the moving end of the lifting device (7). The lower surface of the box (811) is installed with the cutting tool (9). A slide rod (812) is horizontally inserted into the inner cavity of the box (811). The left end of the slide rod (812) is installed with the first limit switch (83). Several teeth (813) that mesh with the first driver (82) are installed on the rear side of the slide rod (812) from left to right. Through the transmission between the first driver (82) and the teeth (813), the slide rod (812) drives the first limit switch (83) to move left and right. A contact (814) is installed at the front end of the slide rod (812). An insulator (815) is horizontally installed on the left side of the inner cavity of the box (811). A resistance wire (816) that is electrically connected to the controller (3) is wound around the outer wall of the insulator (815), and the contact (814) is in contact with the resistance wire (816).

4. The internal thread processing device for a PVC pipe joint according to claim 3, characterized in that, The rotating mechanism (10) includes a dust cover (101) installed on the left end of the crossbar (4). A second driver (102) electrically connected to the controller (3) is installed on the right side wall of the dust cover (101). A rotatable support (103) is installed inside the dust cover (101). A first external gear ring (104) meshing with the second driver (102) is installed on the outer wall of the support (103). The support (103) can be rotated by the transmission between the second driver (102) and the first external gear ring (104).

5. The internal thread processing device for a PVC pipe joint according to claim 4, characterized in that, The positioning mechanism (11) includes a base (111) installed on the left side wall of the support (103). Three sliders (112) are inserted into the inner side of the base (111) along the circumferential direction. A curved clamping plate (113) is installed on the inner side of the slider (112) to expand the contact area between the clamping plate (113) and the PVC joint and avoid excessive pressure during clamping to prevent damage to the PVC joint. A plug rod (114) is installed on the outer side of the left side wall of the slider (112). A second external toothed ring (115) is installed in the inner cavity of the base (111) through a bearing. Several guide grooves (116) are opened in the circumferential direction on the left side wall of the second external toothed ring (115), and the plug rod (114) is inserted into the inner cavity of the guide groove (116).

6. The internal thread processing device for a PVC pipe joint according to claim 5, characterized in that, Several of the guide grooves (116) are distributed clockwise on the outer wall of the second outer toothed ring (115).

7. The internal thread processing device for a PVC pipe joint according to claim 6, characterized in that, The adaptive selection mechanism (12) includes a control box (121) installed on the outer wall of the base (111). A guide rod (122) is vertically installed in the inner cavity of the control box (121). A lifting seat (123) is slidably connected to the outer wall of the guide rod (122). A cylinder (124) electrically connected to the controller (3) is installed on the lower surface of the control box (121). The cylinder (124) can drive the lifting seat (123) to rise and fall. A rack (125) meshing with the second external gear ring (115) is installed on the rear side of the lifting seat (123). Several second limit switches (126) electrically connected to the controller (3) are installed from top to bottom on the front side of the inner cavity of the control box (121).

8. The internal thread processing device for a PVC pipe joint according to claim 7, characterized in that, The upper and lower corners of the front end of the lifting seat (123) are all chamfered.

9. The internal thread processing device for a PVC pipe joint according to claim 8, characterized in that, A time-delay relay is provided between the second limit switch (126) and the controller (3).

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