Preparation process and equipment of acid and alkali resistant CPVC pipe joint

Abstract

The application relates to the technical field of high-molecular polymer forming, in particular to a preparation process and equipment of an acid- and alkali-resistant CPVC pipeline joint, the preparation equipment of the application comprises a rack and an extruder fixedly installed on the top of the rack, the rack is composed of a top plate, a bottom plate and a stand column, and an injection molding part is arranged between the top plate and the bottom plate; a mold opening and closing control mechanism for driving a U-shaped frame to lift to complete mold opening and closing is arranged between the top plate and the bottom plate, a guide mechanism is arranged between the two sides of the inner cavity of the U-shaped frame and corresponding outer mold shells, a discharging control mechanism is arranged at the tail end of the head of the extruder, and a discharging mechanism for assisting in discharging the formed joint is arranged at one end of the top middle part of the bottom plate; the preparation process of the application comprises raw material plasticization, mold closing, injection molding, thread tapping and discharging; the mold closing, injection, mold opening, thread tapping and discharging can be automatically completed in the lifting process of the U-shaped frame, and the structure design is ingenious.

Description

Technical Field

[0001] This invention relates to the field of polymer molding technology, specifically to a process and equipment for preparing acid and alkali resistant CPVC pipe joints. Background Technology

[0002] Chlorinated polyvinyl chloride (CPVC), also known as perchlorinated vinyl, is a product of further chlorination modification of polyvinyl chloride (PVC). Because CPVC has a higher chlorine content than PVC, its physical and mechanical properties, especially weather resistance, aging resistance, corrosion resistance, high-temperature resistance, deformability, solubility, and flame retardancy and self-extinguishing properties, are significantly improved. It is a rapidly developing new type of plastic material in recent years and is widely used in construction, chemical, metallurgical, shipbuilding, electrical appliances, and textile industries.

[0003] The prior art discloses Chinese Patent No. CN 111716630 A: an injection molding device for a plastic pipe clamp, which discloses a filling mechanism fixedly installed on the top of the base, a lower injection mold, an upper injection mold fixedly installed on the end of the oil cylinder, and a demolding mechanism installed on the upper and lower injection molds. The filling mechanism controls the injection process, and at the same time, the rotation of the rotating part drives the gears to rotate synchronously. Then, the rotating rod and the striking rod drive the striking block to strike the outer end face of the lower injection mold, thereby accelerating demolding.

[0004] However, the aforementioned existing technologies still have certain drawbacks. In use, they still employ the traditional moving mold and fixed mold design, and manual control is required for injection after mold closing. After injection molding, a complex structure is needed to facilitate demolding, resulting in a long time interval between adjacent injection molded products and affecting production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a process and equipment for preparing acid and alkali resistant CPVC pipe joints to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] An acid and alkali resistant CPVC pipe joint preparation equipment includes a frame and an extruder fixedly installed on the top of the frame. The frame consists of a top plate, a bottom plate, and a column that is fixedly connected to the top plate and the bottom plate. The extruder head moves through the top plate, and an injection molding section is provided between the top plate and the bottom plate.

[0008] The injection molding part includes a U-shaped frame, two outer mold shells and two mold core pillars. The two mold core pillars are threaded to one end of their opposite ends and have external threads on their outer sides. The two mold core pillars are respectively installed at both ends of the U-shaped frame with through threads. The two outer mold shells are respectively movably sleeved on the outer side of the corresponding mold core pillars. The top of the opposite ends of the two outer mold shells are respectively provided with semi-circular holes.

[0009] A mold opening and closing control mechanism is installed between the top plate and the bottom plate to drive the U-shaped frame to lift and lower to complete the mold opening and closing. A guide mechanism is provided between the two sides of the inner cavity of the U-shaped frame and the corresponding outer mold shell to guide and limit the outer mold shell.

[0010] In a preferred embodiment, the guiding mechanism includes a plurality of crossbars fixedly installed in a ring on the inner side of the U-shaped frame. One end of the crossbar movably passes through the corresponding outer mold shell, and the end of the crossbar extending into the interior of the corresponding outer mold shell is fixedly connected to a ring frame. The ring frame is movably sleeved on the outside of the corresponding mold core column, and the outer mold shell is movably sleeved on the outside of the corresponding ring frame. A spring is sleeved on the outside of the crossbar to fix the outer mold shell and the inner wall of the U-shaped frame.

[0011] In a preferred embodiment, the mold opening and closing control mechanism includes horizontal plates fixed at both ends of the outer side of the U-shaped frame and cylinders fixed at the top of the base plate corresponding to the horizontal plates, with the telescopic ends of the two cylinders fixedly connected to the corresponding horizontal plates.

[0012] The mold opening and closing control mechanism also includes a gear 1 fixedly sleeved on the outer side of one of the opposite ends of the two mold core columns and two toothed plates 1 fixed on the top of the base plate. The two toothed plates 1 are centrally symmetrical about the vertical center line of the U-shaped frame, and the two toothed plates 1 respectively mesh with the corresponding gear 1.

[0013] Two L-shaped plates are fixedly provided on the outer sides of both outer mold shells. A trapezoidal plate is fixedly provided at the bottom of the top plate corresponding to the position of each L-shaped plate. The top surface of each L-shaped plate is set as an inclined surface parallel to the inclined surface on the corresponding trapezoidal plate.

[0014] In a preferred embodiment, both of the mold cores are provided with a threading mechanism for tapping the inner wall of the forming joint. The threading mechanism includes a seat block and a slide block fixed inside the mold core. A cylinder is fixedly installed on one side of the seat block, and a push block is slidably installed on the top of the slide block. The telescopic end of the cylinder is fixedly connected to one end of the push block.

[0015] The tapping mechanism also includes a horizontal bar fixed inside the mold core column. An I-beam is movably inserted through the middle of the horizontal bar. An upper pad and a lower pad are fixed at the top and bottom of the I-beam column, respectively. A trapezoidal block that fits against the corresponding end of the push block is fixed at the bottom of the lower pad. A tool holder is detachably installed on the top of the upper pad by a locking bolt. A tool head is fixedly installed on the top of the tool holder.

[0016] In a preferred embodiment, a tensioning assembly is provided inside each of the two mold core pillars at the corresponding cutter head position. The tensioning assembly includes a slot opened at the top of the mold core pillar and facing the corresponding cutter head, and two supporting inclined plates fixed to the top of the crossbar. A square frame is fixed between the top ends of the two supporting inclined plates.

[0017] The two sides of the frame are both rotatably mounted with rotating shafts. Gear 2 is fixedly sleeved on the outer side of one end of the two rotating shafts outside the frame. Two toothed plates 2 are fixedly mounted on the top of the upper pad, which mesh with the corresponding gear 2. The two toothed plates 2 are centrally symmetrical about the vertical center line of the frame.

[0018] Both of the two rotating shafts are fixedly connected to L-shaped strips on the outer side of one end of the frame, and both L-shaped strips are fixedly connected to one end of an arc plate. Both arc plates have through slots on opposite ends.

[0019] In a preferred embodiment, a reset assembly is provided between the lower pad and the crossbar. The reset assembly includes a through hole that is vertically opened through the top of the crossbar. A second vertical rod is fixedly provided on the top of the lower pad. The top end of the second vertical rod is movably inserted into the corresponding through hole. A fourth spring is sleeved on the outside of the second vertical rod to fix and connect the crossbar and the lower pad.

[0020] In a preferred embodiment, the extruder is equipped with a discharge control mechanism at the end of the extruder head for controlling the discharge on and off. The discharge control mechanism includes an annular cylinder fixed inside the extruder head and a stop arc strip fixed inside two semi-circular holes. A sleeve is movably sleeved inside the annular cylinder, and a material outlet is opened through the outer side of the sleeve.

[0021] Two grooves are formed on the inner side of the ring cylinder, and two ear plates are fixedly provided on the outer side of the sleeve. The two ear plates are slidably connected to the corresponding grooves. A spring is fixedly connected between the bottom of the ear plate and the bottom end face of the inner cavity of the corresponding groove.

[0022] In a preferred embodiment, a feeding mechanism for assisting unloading of the forming joint is installed at one end of the top center of the base plate. The feeding mechanism includes two supports fixed to the top of the base plate, and a swing frame is rotatably installed between the two supports. A through groove is opened at the center of one end of the swing frame.

[0023] The swing frame has a through slot at the end away from the through slot 1. A vertical rod 1, which is fixedly connected to the base plate, is movably inserted through the through slot 1. An annular arc block is movably sleeved on the outside of the vertical rod 1, and a spring 1, which is fixedly connected to the base plate and the annular arc block, is sleeved on the outside of the vertical rod 1.

[0024] In a preferred embodiment, the inner bottom surface of the U-shaped frame is inclined, and a rear baffle and a front baffle are fixedly provided at both ends of the inner side of the U-shaped frame, respectively. A notch is provided in the middle of the rear baffle, which is directly opposite to the front baffle, and an arc protrusion is fixedly provided in the middle of the inner bottom surface of the U-shaped frame.

[0025] This invention also provides a method for producing acid and alkali resistant CPVC pipe joints using the aforementioned acid and alkali resistant CPVC pipe joint preparation equipment, specifically including the following operating steps:

[0026] S1. Raw material plasticization: The raw material for producing pipe fittings is placed inside the extruder for plasticization and extrusion;

[0027] S2. Mold closing: The cylinder pushes the U-shaped frame to rise, allowing the two mold core pillars to approach each other under the meshing action of the corresponding gear and toothed plate. At the same time, the trapezoidal plate guides and limits the L-shaped plate, allowing the two outer mold shells to approach each other, thus completing the mold closing.

[0028] S3, Injection Molding: After the mold is closed, the cylinder continues to push the U-shaped frame upward, and during the upward process, the closed mold is used to open the material discharge control mechanism, allowing the plasticized molten material to enter the mold cavity for molding.

[0029] S4. Tapping: After the material is injected, the cylinder one drives the U-shaped frame to move downward, blocking the machine head from continuing to discharge material and allowing the material in the mold to cool and solidify. Then, the tapping mechanism is controlled to push out the cutter head and continue to drive the U-shaped frame downward, allowing the two outer mold shells to separate under the action of the corresponding spring two. At the same time, the tapping process on the inner side of the forming joint is completed.

[0030] S5. Unloading: After tapping is completed, gear one and the corresponding toothed plate one just disengage from the meshing state, and cylinder one continues to drive the U-shaped frame downward, so that the downward U-shaped frame squeezes the lower end of the swing frame, so that the lower end of the swing frame that follows the swing pushes the finished joint away from the area between the two ring frames.

[0031] The beneficial effects of this invention are:

[0032] 1. This invention controls the U-shaped frame to move upward to automatically close the mold core and outer mold shell in sequence. After the mold is closed, the sleeve is pushed upward to connect the material outlet with the extruder head discharge end, allowing the molten material to be injected into the mold cavity to complete the automatic material injection. Then, the U-shaped frame is controlled to move downward to block the material supply and complete the automatic mold separation of the outer mold shell and mold core in sequence.

[0033] 2. This invention, by setting a thread-tapping mechanism inside both mold core pillars, can simultaneously control the U-shaped frame to move downwards and separate the two mold core pillars, and complete the thread-tapping action on the inner sides of both ends of the finished joint. The structure design is ingenious.

[0034] 3. The present invention uses a feeding mechanism installed on the frame to assist in unloading the formed joint. The downward-moving U-shaped frame can press down on one end of the swing frame with the through slot, so that the end of the swing frame with the through slot swings synchronously and moves the target joint away from the area between the two ring frames, thus completing the unloading. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention from a first-view perspective;

[0037] Figure 2 This is a schematic diagram of the overall structure of the invention from a second perspective;

[0038] Figure 3 This is a partial cross-sectional schematic diagram of the extruder of the present invention;

[0039] Figure 4 This is the present invention. Figure 3 Enlarged schematic diagram of a local part of the structure;

[0040] Figure 5 This is a partial structural schematic diagram of the present invention;

[0041] Figure 6 This is the present invention. Figure 5 A top-view diagram of a partial structure within the image;

[0042] Figure 7 This is the present invention. Figure 6 Schematic diagram of the cross-sectional structure along the AA direction;

[0043] Figure 8 This is the present invention. Figure 6 Schematic diagram of the cross-sectional structure along the BB direction;

[0044] Figure 9 This is a schematic diagram of the thread-tapping mechanism of the present invention;

[0045] Figure 10 This is the present invention. Figure 9 Enlarged schematic diagram of part A' in the middle;

[0046] Figure 11 This is a schematic diagram of the feeding mechanism of the present invention;

[0047] Figure 12 This is a schematic diagram of the structure of the finished product processed according to the present invention.

[0048] The attached diagram is labeled as follows: 1. Frame; 2. Extruder; 3. U-shaped frame; 4. Feeding mechanism; 41. Support; 42. Swing frame; 43. Through slot one; 44. Through slot; 45. Vertical rod one; 46. Annular arc block; 47. Spring one; 5. Mold opening and closing control mechanism; 51. Tooth plate one; 52. Cylinder one; 53. Horizontal plate; 54. Gear one; 55. L-shaped plate; 56. Trapezoidal plate; 6. Guide mechanism; 61. Horizontal rod; 62. Spring two; 63. Ring frame; 7. Discharge control mechanism; 71. Ring cylinder; 72. Sleeve; 73. Feed port; 74. Settling trough; 75. Ear plate; 76. Spring three 77. Stop arc strip; 8. Tapping mechanism; 81. Seat block; 82. Cylinder II; 83. Slide block; 84. Push block; 85. Horizontal bar; 86. I-beam column; 87. Trapezoidal block; 88. Tool holder; 89. Support inclined plate; 810. Square frame; 811. Rotating shaft; 812. Gear II; 813. Tool head; 814. L-shaped strip; 815. Tooth plate II; 816. Arc plate; 817. Through slot II; 818. Through hole; 819. Vertical rod II; 820. Spring IV; 9. Outer mold shell; 10. Mold core column; 11. End cap; 12. Rear baffle; 13. Front baffle; 14. Arc protrusion; 15. Groove. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The CPVC of this invention belongs to the chemical materials industry. Chemical pipe joints made from it are generally used to connect pipelines that transport media in the chemical industry. They have excellent acid and alkali resistance. The molding equipment is one of the equipment used to produce CPVC chemical pipe joints, realizing injection molding and thread tapping of the target chemical pipe joints.

[0051] Example 1: Refer to the appendix of the instruction manual. Figures 1-3 and Figure 5 The present invention provides an acid and alkali resistant CPVC pipe joint preparation equipment, including a frame 1 and an extruder 2 fixedly installed on the top of the frame 1. The frame 1 is composed of a top plate, a bottom plate and a column fixedly connecting the top plate and the bottom plate. The die head of the extruder 2 moves through the top plate, and an injection molding part is provided between the top plate and the bottom plate.

[0052] The injection molding section includes a U-shaped frame 3, two outer mold shells 9, and two mold cores 10. Each of the two mold cores 10 has an end cap 11 threaded to one end opposite to it. The outer sides of the opposite ends of the two mold cores 10 are threaded. The two mold cores 10 are respectively installed at both ends of the U-shaped frame 3 with through threads. The two outer mold shells 9 are respectively movably sleeved on the outer side of the corresponding mold cores 10. The top of the opposite ends of the two outer mold shells 9 are respectively provided with semi-circular holes. The two sets of outer mold shells 9 and mold cores 10 that are sleeved together form two movable molds that can be opened and closed. After the two movable molds are closed, the mold cavity inlet port formed by the two semi-circular holes is exactly matched with the discharge end of the extruder head 2.

[0053] A mold opening and closing control mechanism 5 is installed between the top plate and the bottom plate to drive the U-shaped frame 3 to lift and lower to complete the mold opening and closing. A guide mechanism 6 is provided between the two sides of the inner cavity of the U-shaped frame 3 and the corresponding outer mold shell 9 to guide and limit the outer mold shell 9. A discharge control mechanism 7 is installed at the end of the extruder head to control the discharge on and off.

[0054] It should be noted that the present invention controls the two moving dies to open and close automatically under the guidance of the guide mechanism 6 by driving the U-shaped frame 3 to lift and lower. After the two moving dies are closed, the material discharge control mechanism 7 automatically releases the blocking state of the extruder 2's die head discharge end. Then, during the die opening process, the blocking of the extruder 2's die head discharge end is restored.

[0055] Specifically, such as Figures 3-4 As shown, the discharge control mechanism 7 includes an annular cylinder 71 fixed inside the die head and stop arc strips 77 fixed inside two semi-circular holes. A sleeve 72 is movably sleeved inside the annular cylinder 71, and a material port 73 is opened through the outer side of the sleeve 72. The material port 73 is inclined downward, which can effectively reduce the residue of molten material at the material port 73. The outer diameter of the sleeve 72 is equal to the inner diameter of the mold cavity inlet port formed by the two semi-circular holes. At the same time, the minimum inner radius of the annular arc strip formed by the two stop arc strips 77 is smaller than the radius of the semi-circular holes. After the sleeve 72 is inserted into the mold cavity inlet port formed by the two semi-circular holes, the annular arc strip formed by the two stop arc strips 77 blocks the sleeve 72, so that the material port 73 is connected to the discharge end of the die head of the extruder 2 under the lifting action of the moving die after the die is closed, so as to inject molten material into the mold cavity.

[0056] Two recesses 74 are formed on the inner side of the ring cylinder 71. Two lugs 75 are fixedly provided on the outer side of the sleeve 72. The two lugs 75 are slidably connected to the inside of the corresponding recesses 74. A spring 76 is fixedly connected between the bottom of the lug 75 and the bottom end face of the inner cavity of the corresponding recess 74. When the spring 76 is in its natural state, the sleeve 72 is in the following position: Figure 4As shown, after the sleeve 72 is raised to its maximum extent, the feed port 73 is just connected to the discharge end of the extruder 2. When the sleeve 72 is retracted to be just blocked, the settling tank 74 is still completely separated from the feed port 73. This can effectively prevent the molten material from flowing into the settling tank 74.

[0057] It should be noted that during the process of injecting molten material into the mold cavity formed by the mold closing mechanism, after the two moving molds are closed by the mold opening and closing control mechanism 5, the U-shaped frame 3 is pushed to drive the mold closing mold to continue to rise, so that the sleeve 72 is inserted directly into the mold cavity inlet port formed by the semi-circular holes on the two outer mold shells 9. Under the obstruction of the annular arc formed by the two stop arc strips 77, the rising mold pushes the sleeve 72 to rise, and simultaneously drives the ear plate 75 to rise to pull the corresponding spring three 76 to stretch, so that the material outlet 73 is connected to the discharge end of the extruder 2, so that the molten material is injected into the mold cavity. After the injection is completed, the U-shaped frame 3 is controlled to retract, so that the sleeve 72 is automatically reset under the restoring force of the spring three 76, and the molten material is blocked from continuing to be discharged.

[0058] Specifically, such as Figure 2 and Figure 5 As shown, the mold opening and closing control mechanism 5 includes a horizontal plate 53 fixed at both ends of the outer side of the U-shaped frame 3 and a cylinder 52 fixed on the top of the base plate corresponding to the horizontal plate 53. The extension and retraction ends of the two cylinders 52 are fixedly connected to the corresponding horizontal plate 53.

[0059] The mold opening and closing control mechanism 5 also includes a gear 54 fixedly sleeved on the outer side of the opposite end of the two mold core pillars 10 and two toothed plates 51 fixed on the top of the base plate. The width of the toothed plate 51 is greater than the thickness of the corresponding gear 54, so that while the gear 54 drives the corresponding mold core pillar 10 to rotate, the mold core pillar 10 will also drive the gear 54 to translate along the rack on the corresponding toothed plate 51 under the action of the threaded connection. The two toothed plates 51 are centrally symmetrical about the vertical center line of the U-shaped frame 3, and the two toothed plates 51 mesh with the corresponding gear 54 respectively.

[0060] Two L-shaped plates 55 are fixedly provided on the outer sides of the two outer mold shells 9. A trapezoidal plate 56 is fixedly provided at the bottom of the top plate corresponding to the position of each L-shaped plate 55. The top surface of each L-shaped plate 55 is set as an inclined surface parallel to the inclined surface on the corresponding trapezoidal plate 56.

[0061] It should be noted that during the process of controlling the two moving molds to close, the U-shaped frame 3 is pushed up by the cylinder 52. During this process, due to the meshing between the toothed plate 51 and the gear 54, the gear 54 will drive the corresponding mold core column 10 to rotate synchronously during the upward movement of the U-shaped frame 3. Since the threaded section on the mold core column 10 is threadedly installed on the corresponding end of the U-shaped frame 3, the two mold core columns 10 will move towards each other to close the mold under the rotation of the corresponding gear 54. At the same time, the two gears 54 will rotate and move towards each other along the rack on the toothed plate 51. After the two mold core columns 10 have closed the mold, the gear 54 and the corresponding toothed plate 51 will also disengage from the meshing state.

[0062] Then, the U-shaped frame 3 continues to rise through cylinder 52. During this process, as the U-shaped frame 3 continues to rise, the L-shaped plate 55 on the outer side of the outer mold shell 9 will gradually come into contact with the corresponding trapezoidal plate 56, causing the L-shaped plate 55 to move upward along the inclined surface on the trapezoidal plate 56 as the U-shaped frame 3 rises. This causes the two outer mold shells 9 to move towards each other under the constraint of the trapezoidal plate 56. When the L-shaped plate 55 separates from the corresponding trapezoidal plate 56 during the rising process, the two outer mold shells 9 just complete the mold closing. At this time, the trapezoidal plate 56 will abut against one end of the corresponding L-shaped plate 55 to prevent the outer mold shells 9 that have completed the mold closing from separating.

[0063] After the mold core 10 and the outer mold shell 9 are both closed, the U-shaped frame 3 is still pushed up by the cylinder 52, so that the sleeve 72 is inserted directly into the mold cavity inlet port formed by the semi-circular holes on the two outer mold shells 9, and then the above-mentioned process of injecting molten material occurs.

[0064] Once the mold cavity is filled with molten material, cylinder 52 drives the U-shaped frame 3 to move downwards. During this process, as the U-shaped frame 3 gradually moves downwards, the sleeve 72, which is disengaged from the mold pusher, will reset first, thereby blocking the extruder 2's die head from continuing to discharge material. When the U-shaped frame 3 descends to the point where the L-shaped plate 55 on the outer mold shell 9 disengages from the trapezoidal plate 56, the two outer mold shells 9 will open under the action of the guide mechanism 6. After the spring 62 returns to its initial state, gear 54 will mesh with the corresponding toothed plate 51. Then, as the U-shaped frame 3 continues to descend, gear 54 will rotate in the opposite direction under the action of the corresponding toothed plate 51, thereby completing the opening of the two mold core pillars 10.

[0065] Specifically, such as Figures 5-7As shown, the guide mechanism 6 includes multiple crossbars 61 fixedly installed in a ring shape inside the U-shaped frame 3. One end of each crossbar 61 movably passes through the corresponding outer mold shell 9, and the end of the crossbar 61 extending into the corresponding outer mold shell 9 is fixedly connected to a ring frame 63. The ring frame 63 is movably sleeved on the outside of the corresponding mold core 10, which can prevent the mold core 10 from affecting the stability of the ring frame 63 during rotation. The outer mold shell 9 is movably sleeved on the outside of the corresponding ring frame 63. A spring 62 is fixedly sleeved on the outside of the crossbar 61, which connects the outer mold shell 9 and the inner wall of the U-shaped frame 3. When the spring 62 is in its natural state, the relative positional relationship between the ring frame 63, the mold core 10, and the outer mold shell 9 is as follows: Figure 7 As shown, at this time, the side where the semi-circular hole of the outer mold shell 9 is located is exactly flush with the corresponding end face of the ring frame 63.

[0066] It should be noted that during the above-mentioned mold closing action, since the ring frame 63 is movably sleeved on the outside of the mold core column 10, it can ensure that the rotation of the mold core column 10 is not obstructed during the mold closing process. Also, since there are multiple crossbars 61, the corresponding outer mold shell 9 can only translate along the axial direction of the crossbar 61 without rotating, thus ensuring that the semi-circular holes on the two outer mold shells 9 are always aligned. When the mold shells 9 are closed, the corresponding spring 62 will be gradually stretched and stored energy. After the injection and cooling to form the target joint, as the U-shaped frame 3 descends, the tensile restoring force of the spring 62 will be used to drive the two outer mold shells 9 to separate.

[0067] Specifically, such as Figures 6-10 As shown, both mold core pillars 10 are equipped with a tapping mechanism 8 for tapping the inner wall of the forming joint. The tapping mechanism 8 includes a seat block 81 and a slide block 83 fixed inside the mold core pillar 10. A cylinder 82 is fixedly installed on one side of the seat block 81, and a push block 84 is slidably installed on the top of the slide block 83. The telescopic end of the cylinder 82 is fixedly connected to one end of the push block 84.

[0068] The tapping mechanism 8 also includes a horizontal bar 85 fixed inside the mold core column 10. An I-beam 86 is movably inserted through the middle of the horizontal bar 85. An upper pad and a lower pad are fixed at the top and bottom of the I-beam 86, respectively. A trapezoidal block 87 that fits against the corresponding end of the push block 84 is fixed at the bottom of the lower pad. A tool holder 88 is detachably installed on the top of the upper pad by a locking bolt. A tool head 813 is fixedly installed on the top of the tool holder 88. The detachable tool holder 88 cooperates with the end cap 11 threaded to the end of the mold core column 10, which allows for easy replacement of the tool head 813.

[0069] Both mold core pillars 10 have tensioning assemblies at positions corresponding to the cutter heads 813. Each tensioning assembly includes a slot 15 at the top of the mold core pillar 10, directly opposite the cutter head 813, and two supporting inclined plates 89 fixed to the top of the crossbar 85. The slot 15 is configured as follows: Figure 8 As shown in the state of the through-core column 10, a square frame 810 is fixed between the tops of the two supporting inclined plates 89, which is directly opposite the slot 15.

[0070] A rotating shaft 811 is rotatably mounted through the middle of both sides of the frame 810. Two limiting rings are fixedly sleeved on the outside of the rotating shaft 811, respectively fitting against the inner and outer sides of the frame 810, to prevent the rotating shaft 811 from shifting left and right during rotation. Gear 2 812 is fixedly sleeved on the outer side of the two rotating shafts 811 located outside the frame 810. Two toothed plates 2 815 are fixedly mounted on the top of the upper pad, respectively meshing with the corresponding gear 2 812. The two toothed plates 2 815 are centrally symmetrical about the vertical center line of the frame 810.

[0071] Two rotating shafts 811 are fixedly connected to L-shaped strips 814 on the outer side of one end of the frame 810. One end of each L-shaped strip 814 is fixedly connected to an arc plate 816. The opposite ends of the two arc plates 816 are provided with through slots 817. The width of the through slots 817 is greater than the width of the supporting inclined plate 89, which can prevent the supporting inclined plate 89 from obstructing the swing of the corresponding arc plate 816. The arrangement of the toothed plate 815 can ensure that the toothed plate 815 can drive the corresponding gear 812 to rotate during the upward process, thereby causing the two L-shaped strips 814 to rotate in opposite directions with the corresponding rotating shafts 811, so as to control the two arc plates 816 to release the blocking state of the slot 15.

[0072] A reset assembly is provided between the lower pad and the crossbar 85. The reset assembly includes a through hole 818 vertically penetrating the top of the crossbar 85. A second vertical rod 819 is fixedly provided on the top of the lower pad. The top end of the second vertical rod 819 is movably inserted into the corresponding through hole 818. A fourth spring 820 is sleeved on the outside of the second vertical rod 819 to fix and connect the crossbar 85 and the lower pad. When the fourth spring 820 is in its natural state, the tensioning assembly is in the following position: Figure 8 As shown in the diagram, the reset assembly ensures that after tapping is completed, as cylinder 2 82 gradually pulls push block 84 to reset, I-beam 86 moves downward under the restoring force of spring 4 820, thereby driving the cutter head 813 that ejects from the slot 15 to automatically reset, and driving the two open arc plates 816 to reset and seal the slot 15.

[0073] It should be noted that in the target connector (such as...) Figure 12(As shown) After cooling and shaping, and after the outer mold shell 9 is separated, the push block 84 will be controlled by the cylinder 82 to move along the corresponding slide 83 towards the trapezoidal block 87. During this process, when the moving push block 84 contacts the inclined surface on the corresponding trapezoidal block 87, as the push block 84 continues to move, it will gradually push the trapezoidal block 87 to move upward synchronously with the I-beam 86. During this process, the upward-moving I-beam 86 will drive the vertical rod 819 to move upward along the through hole 818, and compress the spring 820 at the corresponding position.

[0074] At the same time, during the vertical upward movement of the I-beam 86, the toothed plate 815 will be pushed upward. Since the position of the square frame 810 is fixed, the toothed plate 815 will drive the corresponding gear 812 to rotate the shaft 811 during the upward movement. Since the L-shaped strip 814 is fixed on the outside of the rotating shaft 811 and fixedly connected to the corresponding arc plate 816, the L-shaped strip 814 will rotate synchronously with the rotating shaft 811, thereby causing the corresponding arc plate 816 to swing around the axis of the rotating shaft 811, causing the two arc plates 816 to move in opposite directions, thereby releasing the blocking state of the slot 15. After the two arc plates 816 separate, the cutter head 813 will move upward with the I-beam 86, pass through the corresponding slot 15, and insert into the inside of the finished connector. Then, the control cylinder 82 will maintain this state.

[0075] Next, the U-shaped frame 3 is controlled by cylinder 52 to continue moving downward. After the two outer mold shells 9 are separated, gear 54 will resume meshing with the corresponding toothed plate 51. At this time, as the U-shaped frame 3 moves downward, it will synchronously drive gear 54 to move downward along the corresponding toothed plate 51, so that the rotating gear 54 drives the corresponding mold core 10 to rotate. At the same time, the threaded connection structure between the mold core 10 and the U-shaped frame 3 is used to make the two mold core 10 move in opposite directions, so as to complete the tapping action on the inner wall of the finished joint while separating the two mold core 10. The structure design is ingenious.

[0076] Example 2: Refer to the appendix of the instruction manual. Figure 1-2 and Figure 11 The present invention also provides an acid and alkali resistant CPVC pipe joint preparation equipment. A feeding mechanism 4 for auxiliary unloading of the molded joint is installed at one end of the top middle part of the bottom plate. The feeding mechanism 4 includes two supports 41 fixed on the top of the bottom plate. A swing frame 42 is rotatably installed between the two supports 41. A through groove 43 is opened in the middle of one end of the swing frame 42.

[0077] A through slot 44 is provided at the end of the swing frame 42 away from the through slot 43. A vertical rod 45, which is fixedly connected to the base plate, is movably inserted through the through slot 44. An annular arc block 46 is movably fitted on the outside of the vertical rod 45. The maximum diameter of the annular arc block 46 is larger than the width of the through slot 44. The annular arc block 46 can be used to prevent the swing frame 42 from deflecting under the action of the spring 47. The length of the through slot 44 is much larger than the diameter of the vertical rod 45, which ensures that the presence of the vertical rod 45 will not affect the deflection of the swing frame 42. The spring 47, which is fixedly connected to the base plate and the annular arc block 46, is fitted on the outside of the vertical rod 45. When the spring 47 is in its natural state, the state of the swing frame 42 is as follows: Figure 2 In the state shown, the vertical plane of the upper end facing the mold core column 10 is not coplanar with the vertical plane of the corresponding position of the inner side of the outer mold shell 9, so that the U-shaped frame 3 will not be obstructed when it drives the finished product joint downward.

[0078] Furthermore, the inner bottom surface of the U-shaped frame 3 is inclined, and the two inner ends of the U-shaped frame 3 are respectively fixed with a rear baffle 12 and a front baffle 13. The middle of the rear baffle 12 has a notch facing the front baffle 13. The middle of the inner bottom surface of the U-shaped frame 3 is fixed with an arc protrusion 14. The height of the rear baffle 12 is lower than the height of the front baffle 13, so that the front baffle 13 can block the finished joint that swings and falls from the swing frame 42, so that the finished joint that is pushed down can fall smoothly into the area between the rear baffle 12 and the front baffle 13, and slide towards one side of the arc protrusion 14 under the action of the arc protrusion 14, and then automatically roll away from the U-shaped frame 3 along the inclined surface of the inner side of the U-shaped frame 3.

[0079] It should be noted that during the unloading process of the injection-molded target joint, when the two mold core pillars 10 separate under the rotation of gear 54 until they are completely detached from the inner cavity of the joint (i.e., the end face of the corresponding end cap 11 is vertically coplanar with the side where the semi-circular hole of the outer mold shell 9 is located and the corresponding end face of the ring frame 63), gear 54 and the corresponding toothed plate 51 are just disengaged. At this time, one end of the swing frame 42 with the through groove 44 is just in contact with the bottom end face of the U-shaped frame 3, and moves along with the U-shaped frame. 3. Continuing to move downwards, it will press down on the swing frame 42, causing the swing frame 42 to swing about the connection point with the bracket 41 as the central axis. The swing frame 42 will then press down on the annular block 46, compressing the spring 47. The end of the swing frame 42 with the through slot 43 will move towards the target connector during the swing and contact the connector surface. Then, the target connector will be dislodged from the area between the two ring frames 63 and fall into the inner side of the U-shaped frame 3, and finally be discharged.

[0080] In the above technical solution, the cylinder 52 mentioned is a multi-section telescopic cylinder of the DSTA-3S series, and the specific model can be selected according to the actual production; the cylinder 82 mentioned is a single-acting cylinder of model DSA25N200; the extruder 2 mentioned is an existing mature technology, and the selected model can be selected according to the actual production needs.

[0081] A process for manufacturing acid and alkali resistant CPVC pipe fittings, specifically including the following steps:

[0082] S1. Raw material plasticization: The raw material for producing pipe fittings is placed inside the extruder 2 for plasticization and extrusion;

[0083] S2, Mold closing: The cylinder 52 pushes the U-shaped frame 3 to rise, so that the two mold core pillars 10 approach each other under the meshing action of the corresponding gear 54 and toothed plate 51. At the same time, the trapezoidal plate 56 guides and limits the L-shaped plate 55, so that the two outer mold shells 9 approach each other, and the mold closing is completed.

[0084] S3, Injection Molding: After the mold is closed, cylinder 52 continues to push the U-shaped frame 3 upward, and during the upward process, the closed mold is used to push open the discharge control mechanism 7, so that the plasticized molten material enters the cavity of the mold for molding.

[0085] S4. Tapping: After the material is injected, the cylinder 52 drives the U-shaped frame 3 to move downward, blocking the machine head from continuing to discharge material and allowing the material in the mold to cool and solidify. Then, the tapping mechanism 8 is controlled to push out the cutter head 813 and continue to drive the U-shaped frame 3 downward, allowing the two outer mold shells 9 to separate under the action of the corresponding spring 62. At the same time, the tapping process on the inner side of the forming joint is completed.

[0086] S5. Unloading: After tapping is completed, gear 54 and the corresponding toothed plate 51 are just disengaged. The cylinder 52 continues to drive the U-shaped frame 3 downward, so that the downward U-shaped frame 3 squeezes the lower end of the swing frame 42, so that the lower end of the swing frame 42 pushes the finished joint away from the area between the two ring frames 63.

[0087] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An acid and alkali resistant CPVC pipe joint preparation equipment, comprising a rack (1) and an extruder (2) fixedly installed on the top of the rack (1), characterized in that, The rack (1) is composed of a top plate, a bottom plate and a column fixedly connecting the top plate and the bottom plate, the head of the extruder (2) is movably penetrated through the top plate, and an injection molding part is arranged between the top plate and the bottom plate; The injection molding part comprises a U-shaped frame (3), two outer mold shells (9) and two mold core columns (10), the opposite ends of the two mold core columns (10) are threadedly connected with end covers (11), the outer sides of the opposite ends of the two mold core columns (10) are tapped with external threads, and the two mold core columns (10) are respectively arranged at the two ends of the U-shaped frame (3) in a penetrating threaded manner, and the two outer mold shells (9) are movably sleeved on the outer sides of the corresponding mold core columns (10), and the top parts of the opposite ends of the two outer mold shells (9) are respectively penetrated with semicircular holes; A mold opening and closing control mechanism (5) for driving the U-shaped frame (3) to ascend and descend to complete mold opening and closing is arranged between the top plate and the bottom plate, and a guide mechanism (6) for guiding and limiting the outer mold shell (9) is arranged between the inner cavities of the two sides of the U-shaped frame (3) and the corresponding outer mold shells (9); The mold opening and closing control mechanism (5) comprises horizontal plates (53) fixed at the two ends of the outer side of the U-shaped frame (3) and air cylinders (52) fixed on the top of the bottom plate and corresponding to the horizontal plates (53), and the telescopic ends of the two air cylinders (52) are fixedly connected with the corresponding horizontal plates (53); The mold opening and closing control mechanism (5) further comprises gear wheels (54) fixedly sleeved on the outer sides of the opposite ends of the two mold core columns (10) and two toothed plates (51) fixed on the top of the bottom plate, the two toothed plates (51) are centrally symmetrically arranged about the vertical center line of the U-shaped frame (3), and the two toothed plates (51) are respectively engaged with the corresponding gear wheels (54); The outer sides of the two outer mold shells (9) are fixedly provided with two L-shaped plates (55), the bottom of the top plate is fixedly provided with a trapezoidal plate (56) corresponding to the position of each L-shaped plate (55), and the top end surface of each L-shaped plate (55) is arranged as an inclined surface parallel to the inclined surface on the corresponding trapezoidal plate (56); The inner parts of the two mold core columns (10) are respectively provided with tapping thread mechanisms (8) for tapping threads on the inner walls of the molded joints, the tapping thread mechanism (8) comprises a seat block (81) and a sliding seat (83) fixed on the inner side of the mold core column (10), one side of the seat block (81) is fixedly provided with an air cylinder (82), the top of the sliding seat (83) is slidably provided with a push block (84), and the telescopic end of the air cylinder (82) is fixedly connected with one end of the push block (84); The tapping thread mechanism (8) further comprises a horizontal strip (85) fixed on the inner side of the mold core column (10), a H-shaped column (86) movably penetrated through the middle part of the horizontal strip (85), an upper pad seat and a lower pad seat fixedly arranged at the top end and the bottom end of the H-shaped column (86) respectively, a trapezoidal block (87) fixedly arranged on the bottom of the lower pad seat and abutting against the corresponding end of the push block (84), a tool seat (88) detachably arranged on the top of the upper pad seat through locking bolts, and a tool bit (813) fixedly arranged on the top end of the tool seat (88).

2. The acid and alkali resistant CPVC pipe joint preparation equipment according to claim 1, characterized in that, The guide mechanism (6) comprises a plurality of horizontal rods (61) fixedly installed in the inside of the U-shaped frame (3) in a ring shape, one end of the horizontal rod (61) is movably penetrated through the corresponding outer shell (9), and the end of the horizontal rod (61) extending to the inside of the corresponding outer shell (9) is fixedly connected with a ring frame (63), the ring frame (63) is movably sleeved on the outside of the corresponding mold core column (10), the outer shell (9) is movably sleeved on the outside of the corresponding ring frame (63), and the outside of the horizontal rod (61) is sleeved with the spring two (62) fixedly connecting the outer shell (9) and the inner wall of the U-shaped frame (3).

3. The acid and alkali resistant CPVC pipe joint preparation equipment according to claim 1, characterized in that, Two said mold core columns (10) are provided with opening and closing assemblies at positions corresponding to the tool bit (813) inside, the opening and closing assembly comprises a notch (15) opened in the top of the mold core column (10) and opposite to the corresponding tool bit (813), and two support inclined plates (89) fixed on the top of the horizontal bar (85), two support inclined plates (89) are fixedly provided between the top ends of the two support inclined plates (89) and are provided with a square frame (810). The square frame (810) is rotatably installed with a rotating shaft (811) penetrating through the middle of the two sides, the two rotating shafts (811) are fixedly sleeved with gear two (812) outside one end of the square frame (810), the top of the upper pad is fixedly provided with two toothed plates two (815) respectively engaged with the corresponding gear two (812), and the two toothed plates two (815) are centrally symmetric about the vertical center line of the square frame (810). The two rotating shafts (811) are fixedly connected with L-shaped bars (814) outside one end of the square frame (810), and the one end of the two L-shaped bars (814) is fixedly connected with arc plates (816), and the opposite end of the two arc plates (816) is provided with a through slot two (817).

4. The acid and alkali resistant CPVC pipe joint preparation equipment according to claim 3, characterized in that, The reset assembly is provided between the lower pad and the horizontal bar (85), and the reset assembly comprises a through hole (818) vertically penetrating the top of the horizontal bar (85), a vertical rod two (819) fixedly provided on the top of the lower pad, the top end of the vertical rod two (819) movably inserted into the corresponding through hole (818), and a spring four (820) fixedly connecting the horizontal bar (85) and the lower pad sleeved on the outside of the vertical rod two (819).

5. The acid and alkali resistant CPVC pipe joint preparation apparatus according to claim 1, characterized in that, The end of the extruder (2) is provided with a discharging control mechanism (7) for controlling the discharging on-off, the discharging control mechanism (7) comprises a ring cylinder (71) fixedly arranged on the inside of the head and a stop arc bar (77) fixedly arranged in the two semicircular holes, the inside of the ring cylinder (71) is movably sleeved with a sleeve (72), and the outside of the sleeve (72) is provided with a discharge port (73) penetratingly arranged. The inside of the ring cylinder (71) is provided with two grooves (74), the outside of the sleeve (72) is fixedly provided with two ear plates (75), the two ear plates (75) are respectively slidably connected in the corresponding grooves (74), and the spring three (76) is fixedly connected between the bottom of the ear plate (75) and the bottom end face of the inner cavity of the corresponding groove (74).

6. The acid and alkali resistant CPVC pipe joint preparation apparatus according to claim 1, characterized in that, The lower end of the bottom plate is provided with a discharging mechanism (4) for assisting the discharging of the formed joint, the discharging mechanism (4) comprises two supports (41) fixed on the top of the bottom plate, a swing frame (42) is rotatably arranged between the two supports (41), a through slot (43) is formed in the middle of one end of the swing frame (42); The end of the swing frame (42) away from the through slot (43) is provided with a through groove (44), a vertical rod (45) is movably arranged in the through groove (44) and fixedly connected with the bottom plate, an annular arc block (46) is movably arranged on the outer side of the vertical rod (45), and a spring (47) is fixedly connected between the bottom plate and the annular arc block (46).

7. The acid and alkali resistant CPVC pipe joint preparation apparatus according to claim 1, characterized in that, The inner bottom end surface of the U-shaped frame (3) is inclined, and the inner bottom end surface of the U-shaped frame (3) is provided with a rear baffle (12) and a front baffle (13) at both ends, respectively, a notch opposite to the front baffle (13) is formed in the middle of the rear baffle (12), and an arc convex (14) is fixedly arranged in the middle of the inner bottom end surface of the U-shaped frame (3).

8. A process for producing acid and alkali resistant CPVC pipe joint by using the acid and alkali resistant CPVC pipe joint production apparatus according to any one of claims 1 to 7, characterized in that, Specifically includes the following operation steps: S1, raw material plasticization: the raw material for producing pipe joint is placed in the extruder (2) for plasticizing extrusion; S2, mold closing: the U-shaped frame (3) is pushed up by the cylinder (52), so that the two mold core columns (10) are close to each other under the meshing action of the corresponding gear (54) and the toothed plate (51), at the same time, the L-shaped plate (55) is guided and limited by the trapezoidal plate (56), so that the two outer mold shells (9) are close to each other, and the mold closing is completed; S3, injection molding: after the mold closing is completed, the cylinder (52) continues to push the U-shaped frame (3) upwards, and the closed mold is used to open the discharge control mechanism (7) in the process of rising, so that the plasticized molten material enters the cavity of the mold for molding; S4, tapping thread: after the injection is completed, the U-shaped frame (3) is driven downward by the cylinder (52), the nozzle continues to discharge, and the material in the mold is cooled and shaped, then the tapping thread mechanism (8) is controlled to push out the tool bit (813), and the U-shaped frame (3) is continuously driven downward, so that the two outer mold shells (9) are separated under the action of the corresponding spring (62), and the tapping thread processing of the inside of the formed joint is completed; S5, discharging: after the tapping thread is completed, the gear (54) and the corresponding toothed plate (51) are just out of engagement, and the U-shaped frame (3) is continuously driven downward by the cylinder (52), so that the lower end of the swing frame (42) is pressed by the downward U-shaped frame (3), and the lower end of the swing frame (42) is driven to deviate to make the product joint be pushed away from the area between the two ring frames (63).

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