Acid and alkali resistant CPVC (chlorinated polyvinyl chloride) pipeline joint preparation process and equipment thereof

Abstract

The invention relates to the technical field of high-molecular polymer forming, in particular to an acid and alkali resistant CPVC pipeline connector preparation technology and equipment thereof.The preparation equipment comprises a rack and an extruder fixedly installed at the top of the rack, the rack is composed of a top plate, a bottom plate and stand columns, and an injection molding part is arranged between the top plate and the bottom plate; a mold opening and closing control mechanism used for driving the U-shaped frame to ascend and descend to complete mold opening and closing is installed between the top plate and the bottom plate, guide mechanisms are arranged between the two sides of an inner cavity of the U-shaped frame and the corresponding outer mold shells, and a discharging control mechanism is installed at the tail end of a machine head of the extruder. A discharging mechanism used for conducting auxiliary discharging on the formed connector is installed at one end of the middle of the top of the bottom plate. The preparation technology comprises the steps that raw materials are plasticized; closing the mold; performing injection molding; tapping threads; in the lifting process of the U-shaped frame, mold closing, material injection, mold splitting, tapping and discharging can be automatically completed, and the structural design is ingenious.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer molding, and specifically to a preparation process and equipment for acid and alkali resistant CPVC pipe joints. Background Art

[0002] Chlorinated polyvinyl chloride (CPVC), also known as perchlorinated polyvinyl chloride, is a product obtained by further chlorination modification of polyvinyl chloride (PVC). Since the chlorine content of chlorinated polyvinyl chloride is higher than that of polyvinyl chloride, the physical and mechanical properties of chlorinated polyvinyl chloride, especially weather resistance, aging resistance, corrosion resistance, high temperature resistance, deformability, solubility and flame retardant self-extinguishing properties, have been greatly improved. It is a new type of plastic material with a relatively fast development speed in recent years and is widely used in fields such as construction, chemical industry, metallurgy, shipbuilding, electrical appliances, and textiles.

[0003] The prior art discloses a Chinese patent with publication number CN 111716630 A: an injection molding device for plastic pipe clamps, and discloses a filling mechanism fixedly installed on the top of the base, an injection molding lower mold, an injection molding upper mold fixedly installed at the end of the oil cylinder, and a demolding mechanism installed on the injection molding upper mold and the injection molding lower mold. The injection molding process is controlled by the filling mechanism. At the same time, the rotation of the rotating part drives the synchronous rotation of gear three, and then the striker is driven by the rotating rod and the striking rod to strike the outer end face of the injection molding lower mold to accelerate demolding.

[0004] However, the above prior art still has certain defects. That is, in the use process, the traditional moving mold and fixed mold design is still adopted, and the injection material is manually controlled after the mold closing is completed. After injection molding, a complex structure is required to cooperate with demolding, resulting in a long time interval between adjacent injection products and affecting production efficiency. Summary of the Invention

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

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An acid and alkali resistant CPVC pipe joint preparation equipment, including a frame and an extruder fixedly installed on the top of the frame. The frame is composed of a top plate, a bottom plate, and columns fixedly connecting the top plate and the bottom plate. The head of the extruder movably penetrates the top plate, and an injection molding part is arranged 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 columns. End caps are threadedly connected to the opposite ends of the two mold core columns. External threads are tapped on the outer sides of the opposite ends of the two mold core columns, and the two mold core columns are respectively installed through threads at both ends of the U-shaped frame. The two outer mold shells are respectively movably sleeved on the outer sides of the corresponding mold core columns. Semi-circular holes are respectively formed through the tops of the opposite ends of the two outer mold shells;

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

[0010] In a preferred embodiment, the guiding mechanism includes a plurality of cross bars fixedly installed in a ring shape on the inner side of the U-shaped frame. One end of the cross bar movably penetrates through the corresponding outer mold shell, and a ring frame is fixedly connected to the end of the cross bar extending into the corresponding outer mold shell. The ring frame is movably sleeved on the outer side of the corresponding mold core column, and the outer mold shell is movably sleeved on the outer side of the corresponding ring frame. A second spring for fixedly connecting the outer mold shell and the inner wall of the U-shaped frame is sleeved on the outer side of the cross bar.

[0011] In a preferred embodiment, the mold opening and closing control mechanism includes cross plates fixed at both ends on the outer side of the U-shaped frame and a first cylinder fixed on the top of the bottom plate corresponding to the cross plates. The telescopic ends of the two first cylinders are fixedly connected to the corresponding cross plates;

[0012] The mold opening and closing control mechanism further includes a first gear fixedly sleeved on the outer sides of the opposite ends of the two mold core columns and two first toothed plates fixed on the top of the bottom plate. The two first toothed plates are symmetrically arranged about the vertical center line of the U-shaped frame, and the two first toothed plates are respectively meshed with the corresponding first gears;

[0013] Two L-shaped plates are respectively fixed on the outer sides of the two outer mold shells. Trapezoidal plates are respectively fixed at the positions corresponding to each L-shaped plate on the bottom of the top plate. The top end surfaces of each L-shaped plate are set as inclined surfaces parallel to the inclined surfaces on the corresponding trapezoidal plates.

[0014] In a preferred embodiment, a thread tapping mechanism for tapping the inner wall of the formed joint is provided inside both of the two mold core columns. The thread tapping mechanism includes a seat block and a sliding seat fixed on the inner side of the mold core column. A second cylinder is fixedly installed on one side of the seat block. A pushing block is slidably installed on the top of the sliding seat. The telescopic end of the second cylinder is fixedly connected to one end of the pushing block;

[0015] The thread tapping mechanism further includes a cross bar fixed on the inner side of the mold core column. An I-shaped column is movably penetrated through the middle of the cross bar. An upper cushion seat and a lower cushion seat are respectively fixed at the top end and the bottom end of the I-shaped column. A trapezoidal block is fixedly installed at the bottom of the lower cushion seat and is in fit with the corresponding end of the pushing block. A tool holder is detachably installed on the top of the upper cushion seat through a locking bolt, and a tool bit is fixedly installed at the top end of the tool holder.

[0016] In a preferred embodiment, opening and closing components are provided at positions corresponding to the cutter heads inside the two core columns. The opening and closing components include notches opened at the tops of the core columns and facing the corresponding cutter heads, and two support inclined plates fixed to the top of the cross bar. A square frame is fixedly provided between the tops of the two support inclined plates;

[0017] Rotating shafts are installed through the middle parts on both sides of the square frame in a penetrating manner. Fixed sleeves of gears II are provided on the outer sides of one ends of the two rotating shafts located outside the square frame. Two rack bars II meshing with the corresponding gears II are fixedly provided on the top of the upper cushion seat, and the two rack bars II are symmetrically arranged about the vertical center line of the square frame;

[0018] Fixed connections of L-shaped bars are provided on the outer sides of one ends of the two rotating shafts located outside the square frame. One ends of the two L-shaped bars are fixedly connected with arc plates, and through slots II are opened at the opposite ends of the two arc plates.

[0019] In a preferred embodiment, a reset component is provided between the lower cushion seat and the cross bar. The reset component includes a through hole vertically penetrating and opened at the top of the cross bar. A second vertical rod is fixedly provided on the top of the lower cushion seat, and the top end of the second vertical rod is movably inserted into the corresponding through hole. A spring IV fixedly connecting the cross bar and the lower cushion seat is sleeved on the outer side of the second vertical rod.

[0020] In a preferred embodiment, a discharge control mechanism for controlling the on-off of the discharge is installed at the end of the head of the extruder. The discharge control mechanism includes an annular cylinder fixed to the inner side of the head and stop arc bars fixed in two semi-circular holes. A sleeve is movably sleeved inside the annular cylinder, and a material port is penetrated and opened on the outer side of the sleeve;

[0021] Two sunken grooves are opened on the inner side of the annular cylinder. Two ear plates are fixedly provided on the outer side of the sleeve, and the two ear plates are respectively slidably connected inside the corresponding sunken grooves. A spring III fixedly connecting the ear plate and the inner cavity bottom end face of the corresponding sunken groove is provided at the bottom of the ear plate.

[0022] In a preferred embodiment, a blanking mechanism for assisting in blanking the formed joint is installed at one end in the middle of the top of the bottom plate. The blanking mechanism includes two brackets fixed to the top of the bottom plate. A swing frame is rotatably installed between the two brackets, and a through slot I is opened in the middle of one end of the swing frame;

[0023] A through slot is opened at one end of the swing frame away from the through slot I. A first vertical rod fixedly connected with the bottom plate is movably penetrated inside the through slot. An annular arc block is movably sleeved on the outer side of the first vertical rod, and a spring I fixedly connecting the bottom plate and the annular arc block is sleeved on the outer side of the first vertical rod.

[0024] In a preferred embodiment, the inner bottom end surface of the U-shaped frame is inclined, and a rear baffle and a front baffle are respectively fixed at both inner ends of the U-shaped frame. A notch facing the front baffle is formed in the middle of the rear baffle, and an arc convex is fixed in the middle of the inner bottom end surface of the U-shaped frame.

[0025] The present invention also provides a method for producing an acid and alkali resistant CPVC pipe joint by using the above-mentioned acid and alkali resistant CPVC pipe joint manufacturing equipment, which specifically includes the following operation steps:

[0026] S1. Raw material plasticization: Place the raw materials for producing the pipe joint into the extruder for plasticizing and extruding.

[0027] S2. Mold closing: Use the first cylinder to push the U-shaped frame upward, so that the two mold core columns approach each other under the meshing action of the corresponding first gear and first toothed plate. At the same time, use the trapezoidal plate to guide and limit the L-shaped plate, so that the two outer mold shells approach each other to complete mold closing.

[0028] S3. Injection molding: After mold closing is completed, the first cylinder continues to push the U-shaped frame upward, and during the upward movement, use the closed mold to push out the feeding control mechanism, so that the plasticized molten material enters the cavity of the mold for molding.

[0029] S4. Thread tapping: After the injection is completed, use the first cylinder to drive the U-shaped frame downward to block the head from continuing to discharge material, and let the material in the mold cool and solidify. Then control the thread tapping mechanism to push out the tool head, and continue to drive the U-shaped frame downward, so that the two outer mold shells are separated under the action of the corresponding second springs. At the same time, complete the thread tapping treatment on the inner side of the formed joint.

[0030] S5. Unloading: After thread tapping is completed, the first gear and the corresponding first toothed plate are just disengaged from the meshing state, and use the first cylinder to continue to drive the U-shaped frame downward, so that the downward moving U-shaped frame squeezes the lower end of the swing frame, so that the lower end of the swing frame that follows and swings deflects to push the finished joint out of the area between the two ring frames.

[0031] The beneficial effects of the present invention:

[0032] 1. The present invention controls the upward movement of the U-shaped frame to sequentially complete the automatic mold closing of the mold core columns and the outer mold shells, and after the mold closing is completed, it pushes the sleeve upward to conduct the material port with the discharge end of the head of the extruder, so that the molten material is injected into the mold cavity to complete automatic feeding. Then, it controls the downward movement of the U-shaped frame to block the material supply and sequentially complete the automatic mold opening of the outer mold shell and the mold core column.

[0033] 2. The present invention is provided with a thread tapping mechanism inside both mold core columns, and can complete the thread tapping action on the inner sides of both ends of the finished joint while controlling the downward movement of the U-shaped frame to separate the two mold core columns. The structural design is ingenious.

[0034] 3. In the present invention, a blanking mechanism for assisting in blanking the formed joint is installed on the frame. The downward movement of the U-shaped frame can be used to squeeze the end of the swing frame where the first through groove is opened downward, so that while the end of the swing frame where the first through groove is opened swings synchronously, the target joint is toggled out of the area between the two ring frames to complete blanking. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0036] Figure 1 is the overall structural schematic diagram of the first perspective of the present invention;

[0037] Figure 2 is the overall structural schematic diagram of the second perspective of the present invention;

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

[0039] Figure 4 is the present invention Figure 3 partial structural enlarged schematic diagram;

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

[0041] Figure 6 is the present invention Figure 5 partial structural top view schematic diagram;

[0042] Figure 7 is the present invention Figure 6 A-A cross-sectional structural schematic diagram;

[0043] Figure 8 is the present invention Figure 6 B-B cross-sectional structural schematic diagram;

[0044] Figure 9 is the structural schematic diagram of the tapping mechanism of the present invention;

[0045] Figure 10 is the present invention Figure 9 partial structural enlarged schematic diagram of part A';

[0046] Figure 11 is the structural schematic diagram of the blanking mechanism of the present invention;

[0047] Figure 12 is the structural schematic diagram of the processed finished product of the present invention.

[0048] The reference numerals in the figure are as follows: 1, frame; 2, extruder; 3, U-shaped frame; 4, blanking mechanism; 41, support; 42, swing frame; 43, first through groove; 44, through slot; 45, first vertical rod; 46, annular arc block; 47, first spring; 5, mold opening and closing control mechanism; 51, first toothed plate; 52, first cylinder; 53, cross plate; 54, first gear; 55, L-shaped plate; 56, trapezoidal plate; 6, guiding mechanism; 61, cross bar; 62, second spring; 63, ring frame; 7, discharge control mechanism; 71, ring cylinder; 72, sleeve; 73, material outlet; 74, sunk groove; 75, ear plate; 76, third spring; 77, stop arc strip; 8, thread tapping mechanism; 81, seat block; 82, second cylinder; 83, sliding seat; 84, pushing block; 85, cross strip; 86, I-shaped column; 87, trapezoidal block; 88, tool holder; 89, supporting inclined plate; 810, square frame; 811, rotating shaft; 812, second gear; 813, tool bit; 814, L-shaped strip; 815, second toothed plate; 816, arc plate; 817, second through groove; 818, through hole; 819, second vertical rod; 820, fourth spring; 9, outer mold shell; 10, mold core column; 11, end cover; 12, rear baffle; 13, front baffle; 14, arc convex; 15, notch. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] CPVC of the present invention belongs to a kind of chemical material industry. The chemical pipe joints made of it are generally used to connect the pipes for transporting media in the chemical industry and have excellent acid and alkali resistance. And this molding equipment is one of the equipment used for producing CPVC chemical pipe joints, realizing injection molding and thread tapping treatment of the target chemical pipe joints.

[0051] Embodiment 1: Referring to the attached drawings of the specification 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 columns fixedly connecting the top plate and the bottom plate. The head of the extruder 2 movably penetrates through the top plate, and an injection molding part is arranged between the top plate and the bottom plate;

[0052] The injection molding part includes a U-shaped frame 3, two outer mold shells 9 and two mold core columns 10, the two mold core columns 10 are threadedly connected to the end caps 11 at the opposite ends, the outer sides of the two mold core columns 10 at the opposite ends are tapped with external threads, and the two mold core columns 10 are respectively installed at the two ends of the U-shaped frame 3 with through threads, and the two outer mold shells 9 are respectively movably sleeved on the outer sides of the corresponding mold core columns 10, and the tops of the opposite ends of the two outer mold shells 9 are penetrated with semicircular holes, wherein the two sets of outer mold shells 9 and mold core columns 10 that are sleeved together just constitute two movable molds that can be opened and closed, and after the two movable molds are closed, the mold cavity feed port formed by the two semicircular holes is just compatible with the die head discharge end of the extruder 2;

[0053] A mold opening and closing control mechanism 5 is installed between the top plate and the bottom plate for driving the U-shaped frame 3 to rise and fall to complete the opening and closing of the mold. A guide mechanism 6 for guiding and limiting the outer mold shell 9 is provided between the two sides of the inner cavity of the U-shaped frame 3 and the corresponding outer mold shell 9. A discharge control mechanism 7 for controlling the discharge on and off is installed at the end of the head of the extruder 2.

[0054] It should be noted that the present invention controls the two movable molds to automatically open and close under the guidance of the guide mechanism 6 by driving the U-shaped frame 3 to rise and fall, and after controlling the two movable molds to complete the mold closing, the discharge control mechanism 7 automatically releases the blocking state of the head discharge end of the extruder 2, and then restores the blocking of the head discharge end of the extruder 2 during the mold opening process.

[0055] Specifically, Figures 3 - 4 As shown, the discharge control mechanism 7 includes an annular tube 71 fixed on the inner side of the die head and a stop arc strip 77 fixed inside the two semicircular holes, a sleeve 72 is movably sleeved on the inner side of the annular tube 71, and a material port 73 is penetrated and opened on the outer side of the sleeve 72, wherein the material port 73 is arranged to be inclined downward, which can effectively reduce the residual molten material at the material port 73, and the outer diameter of the sleeve 72 is equal to the inner diameter of the die cavity feed port formed by the two semicircular holes, and 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 semicircular holes, so that after the sleeve 72 is inserted into the die cavity feed port formed by the two semicircular holes, the annular arc strip formed by the two stop arc strips 77 is used to block the sleeve 72, so that the material port 73 is connected to the die head discharge end of the extruder 2 under the lifting action of the movable mold after the mold is closed to inject the molten material into the die cavity;

[0056] Two recesses 74 are provided inside the ring tube 71, and two ear plates 75 are fixedly provided outside the sleeve 72. The two ear plates 75 are respectively slidably connected to the inside of the corresponding recesses 74. A spring 3 76 is fixedly connected between the bottom of the ear plate 75 and the bottom end surface of the inner cavity of the corresponding recess 74. When the spring 3 76 is in a natural state, the sleeve 72 is in a state as shown in FIG. Figure 4In the shown state, after the sleeve 72 is lifted to the maximum extent, the material inlet 73 is exactly communicated with the discharge end of the head of the extruder 2. When the sleeve 72 retracts to just be blocked, the sink 74 and the material inlet 73 are in a completely staggered state, so that the molten material can be effectively prevented from flowing into the interior of the sink 74.

[0057] It should be noted that during the process of injecting molten material into the cavity formed by mold clamping, after using the mold opening and closing control mechanism 5 to control the two moving molds to complete mold clamping, continue to push the U-shaped frame 3 to drive the clamped mold to rise further, so that the sleeve 72 directly inserts into the material inlet port of the cavity formed by the semi-circular holes on the two outer mold shells 9. Under the blocking of the annular arc formed by the two stop arc strips 77, let the rising mold push the sleeve 72 to rise, and simultaneously drive the ear plate 75 to rise to pull the corresponding spring three 76 to stretch, so that the material inlet 73 is communicated with the discharge end of the head of the extruder 2, and the molten material is injected into the cavity. After the injection is completed, control the U-shaped frame 3 to retract, so that the sleeve 72 automatically resets under the restoring force of the spring three 76 and blocks the continuous discharge of the molten material.

[0058] Specifically, as Figure 2 and Figure 5 shown, the mold opening and closing control mechanism 5 includes cross plates 53 fixed at both outer ends of the U-shaped frame 3 and cylinder one 52 fixed at the top of the bottom plate corresponding to the cross plates 53. The telescopic ends of the two cylinder one 52 are fixedly connected to the corresponding cross plates 53;

[0059] The mold opening and closing control mechanism 5 further includes a gear one 54 fixedly sleeved on the outer sides of the opposite ends of the two mold core columns 10 and two toothed plates one 51 fixed at the top of the bottom plate. Among them, the width of the toothed plate one 51 is greater than the thickness of the corresponding gear one 54, so that while the gear one 54 drives the corresponding mold core column 10 to rotate, the mold core column 10 will also drive the gear one 54 to perform translational motion along the rack on the corresponding toothed plate one 51 under the action of screw connection. The two toothed plates one 51 are centrosymmetrically arranged about the vertical center line of the U-shaped frame 3, and the two toothed plates one 51 are respectively meshed with the corresponding gear one 54;

[0060] Two L-shaped plates 55 are fixedly provided on the outer sides of the two outer mold shells 9. Trapezoidal plates 56 are fixedly provided at the bottom of the top plate corresponding to each L-shaped plate 55. The top end surfaces of each L-shaped plate 55 are arranged as inclined surfaces parallel to the inclined surfaces on the corresponding trapezoidal plates 56.

[0061] It should be noted that, in the process of controlling the two movable molds to close the mold, the U-shaped frame 3 is pushed up by the cylinder 52. In this process, due to the meshing between the tooth plate 51 and the gear 54, the gear 54 will drive the corresponding mold core column 10 to rotate synchronously during the rising process of the U-shaped frame 3. Because 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 under the rotation of the corresponding gear 54 to close the mold, and the two gears 54 will rotate and move towards each other along the rack on the tooth plate 51. After the two mold core columns 10 complete the mold closing, the gear 54 and the corresponding tooth plate 51 are just out of meshing state;

[0062] Then, the U-shaped frame 3 is pushed upward by the cylinder 1 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 contact the corresponding trapezoidal plate 56, so that the L-shaped plate 55 will move upward along the inclined surface on the trapezoidal plate 56 as the U-shaped frame 3 rises, so that the two outer mold shells 9 move toward each other under the restriction 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 press against one end of the corresponding L-shaped plate 55 to prevent the outer mold shell 9 that has completed the mold closing from separating;

[0063] When the mold core column 10 and the outer mold shell 9 are both molded, the U-shaped frame 3 is still pushed up by the cylinder 1 52 to allow the sleeve 72 to be directly inserted into the mold cavity feed port formed by the semicircular holes on the two outer mold shells 9, and then the above-mentioned process of injecting the molten material occurs;

[0064] When the mold cavity is filled with molten material, the U-shaped frame 3 will be driven to move downward by the cylinder 1 52. During this process, as the U-shaped frame 3 gradually moves downward, the sleeve 72 that is separated from the mold push will be reset first, thereby blocking the head of the extruder 2 from continuing to discharge material. When the U-shaped frame 3 descends to the state where the L-shaped plate 55 on the outer mold shell 9 is separated from the abutment state of the trapezoidal plate 56, the two outer mold shells 9 will be opened under the action of the guide mechanism 6. After the spring 2 62 returns to its initial state, the gear 1 54 will mesh with the corresponding tooth plate 1 51. Then, as the U-shaped frame 3 continues to descend, the gear 1 54 will rotate in the opposite direction under the action of the corresponding tooth plate 1 51, thereby completing the opening of the two mold core columns 10.

[0065] Specifically, Figures 5 - 7As shown, the guiding mechanism 6 includes a plurality of cross bars 61 fixedly installed in a ring shape on the inner side of the U-shaped frame 3. One end of the cross bar 61 movably penetrates through the corresponding outer mold shell 9, and a ring frame 63 is fixedly connected to the end of the cross bar 61 extending into the corresponding outer mold shell 9. The ring frame 63 is movably sleeved on the outer side of the corresponding mold core column 10, which can prevent the mold core column 10 from affecting the stability of the ring frame 63 during rotation. The outer mold shell 9 is movably sleeved on the outer side of the corresponding ring frame 63. A second spring 62 for fixedly connecting the outer mold shell 9 and the inner wall of the U-shaped frame 3 is sleeved on the outer side of the cross bar 61. Among them, when the second spring 62 is in a natural state, the relative positional relationship among the ring frame 63, the mold core column 10, and the outer mold shell 9 is as Figure 7 shown. At this time, the side where the semi-circular hole of the outer mold shell 9 is located is exactly flush with the end face of the corresponding end of the ring frame 63.

[0066] It should be noted that during the above-mentioned mold closing operation, since the ring frame 63 is movably sleeved on the outer side of the mold core column 10, it can ensure that the rotational mold closing process of the mold core column 10 is unobstructed. Also, because there are multiple cross bars 61, the corresponding outer mold shell 9 can only translate along the axial direction of the cross bar 61 and will not rotate, so as to ensure that the semi-circular holes on the two outer mold shells 9 are always in a facing state. Among them, when the outer mold shell 9 is closed, the corresponding second spring 62 will be gradually stretched and store energy. After the injection molding is completed and cooled to form the target joint, as the U-shaped frame 3 descends, the stretching and restoring force of the second spring 62 will be used to drive the two outer mold shells 9 to separate.

[0067] Specifically, as Figures 6 - 10 shown, a tapping mechanism 8 for tapping the inner wall of the formed joint is provided inside both mold core columns 10. The tapping mechanism 8 includes a seat block 81 and a sliding seat 83 fixed inside the mold core column 10. A second cylinder 82 is fixedly installed on one side of the seat block 81. A pushing block 84 is slidably installed on the top of the sliding seat 83. The telescopic end of the second cylinder 82 is fixedly connected to one end of the pushing block 84;

[0068] The tapping mechanism 8 further includes a cross bar 85 fixed inside the mold core column 10. An I-shaped column 86 is movably penetrated through the middle of the cross bar 85. Upper and lower cushion seats are respectively fixed at the top and bottom of the I-shaped column 86. A trapezoidal block 87 that fits the corresponding end of the pushing block 84 is fixedly installed at the bottom of the lower cushion seat. A tool holder 88 is detachably installed at the top of the upper cushion seat through a locking bolt. A tool bit 813 is fixedly installed at the top of the tool holder 88. Among them, the detachably installed tool holder 88 cooperates with an end cap 11 threadedly connected to the end of the mold core column 10, which can facilitate the replacement of the tool bit 813.

[0069] The opening and closing components are arranged at the positions of the cutter heads 813 in the two core columns 10, and the opening and closing components include a notch 15 opened at the top of the core column 10 and facing the corresponding cutter heads 813, and two supporting inclined plates 89 fixed at the top of the horizontal bar 85, wherein the notch 15 is arranged as follows: Figure 8 In the state of the through-mold core column 10 shown, a square frame 810 facing the notch 15 is fixedly provided between the top ends of the two supporting inclined plates 89;

[0070] A rotating shaft 811 is installed in the middle of both sides of the square frame 810 in a through-type rotational manner, wherein two limiting rings are fixedly sleeved on the outer side of the rotating shaft 811 and respectively fit with the inner side and the outer side of the square frame 810 to prevent the rotating shaft 811 from deviating left and right during the rotation process, and a gear 2 812 is fixedly sleeved on the outer side of one end of the two rotating shafts 811 located outside the square frame 810, and two tooth plates 2 815 meshing with the corresponding gear 2 812 are fixedly installed on the top of the upper cushion seat, and the two tooth plates 2 815 are centrally symmetrically arranged about the vertical center line of the square frame 810;

[0071] The outer sides of the ends of the two rotating shafts 811 located outside the square frame 810 are fixedly connected with L-shaped bars 814, and one end of the two L-shaped bars 814 is fixedly connected with arc plates 816, and the ends of the two arc plates 816 facing away from each other are provided with through grooves 817, wherein the width of the through grooves 817 is greater than the width of the supporting inclined plate 89, so as to prevent the supporting inclined plate 89 from hindering the swing of the corresponding arc plates 816, and the arrangement of the tooth plate 815 can ensure that the tooth plate 815 can drive the corresponding gear 812 to rotate during the rising process, thereby driving the two L-shaped bars 814 to rotate away from each other with the corresponding rotating shafts 811, so as to control the two arc plates 816 to release the blocking state of the notch 15;

[0072] A reset assembly is provided between the lower cushion and the horizontal bar 85, and the reset assembly includes a through hole 818 vertically penetrating through the top of the horizontal bar 85, a second vertical rod 819 is fixedly provided on the top of the lower cushion, and the top of the second vertical rod 819 is movably inserted into the corresponding through hole 818, and a spring fourth 820 is sleeved on the outer side of the second vertical rod 819 for fixing the horizontal bar 85 and the lower cushion, wherein when the spring fourth 820 is in a natural state, the opening and closing assembly is in a state as shown in FIG. Figure 8 The state shown in the figure, and the setting of the reset assembly can ensure that after the tapping is completed, as the cylinder 2 82 gradually pulls the push block 84 to reset, the I-beam 86 moves downward under the restoring force of the spring 4 820, thereby driving the cutter head 813 that pushes out the notch 15 to automatically reset, and driving the two arc plates 816 in the open state to reset and block the notch 15.

[0073] It should be noted that at the target joint (such as Figure 12As shown in the figure, after the outer mold shell 9 is cooled and shaped, and the mold separation of the outer mold shell 9 is completed, the push block 84 will be controlled by the cylinder 82 to move along the corresponding slide seat 83 toward the direction of 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 column 86. During this process, the upwardly moving I-beam column 86 will drive the vertical rod 819 to move upward along the direction of the through hole 818, and compress the spring 4 820 at the corresponding position;

[0074] At the same time, during the vertical upward movement of the I-beam 86, the tooth plate 815 will be synchronously pushed to move upward. Since the position of the frame 810 is fixed, the tooth plate 815 will drive the corresponding gear 812 to drive the shaft 811 to rotate during the upward movement. Since the L-shaped bar 814 is fixed to the outer side of the rotating shaft 811 and is fixedly connected to the arc plate 816 at the corresponding position, the L-shaped bar 814 will rotate synchronously with the rotating shaft 811, thereby driving the corresponding arc plate 816 to deflect with the axis of the rotating shaft 811 as the central axis, so that the two arc plates 816 move in opposite directions, thereby releasing the blocking state of the notch 15. After the two arc plates 816 are separated, the cutter head 813 will move upward with the I-beam 86, pass through the corresponding notch 15, and be inserted into the inner side of the finished joint, and then control the cylinder 82 to maintain this state.

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

[0076] Example 2: Refer to the attached specification Figures 1 - 2 and Figure 11 The present invention also provides an acid- and alkali-resistant CPVC pipe joint preparation device, wherein a feeding mechanism 4 for assisting the unloading of the formed joint is installed at one end of the middle portion of the top of the bottom plate, and the feeding mechanism 4 comprises two brackets 41 fixed to the top of the bottom plate, and a swing frame 42 is rotatably installed between the two brackets 41, and a through groove 43 is opened in the middle portion of one end of the swing frame 42;

[0077] One end of the swing frame 42 away from the through slot 43 is provided with a through groove 44. A first vertical rod 45 fixedly connected to the bottom plate is movably inserted through the inside of the through groove 44. An annular arc block 46 is movably sleeved outside the first vertical rod 45. The maximum diameter of the annular arc block 46 is greater than the width of the through groove 44. The annular arc block 46 can be used to prevent the swing frame 42 from yawing under the action of the first spring 47. The length of the through groove 44 is much greater than the diameter of the first vertical rod 45, which can ensure that the existence of the first vertical rod 45 will not affect the yaw of the swing frame 42. A first spring 47 fixedly connecting the bottom plate and the annular arc block 46 is sleeved outside the first vertical rod 45. When the first spring 47 is in a natural state, the state of the swing frame 42 is as Figure 2 shown in the figure. The vertical plane on the side of the upper end face facing the mold core column 10 and the vertical plane at the corresponding position on the inner side of the outer mold shell 9 are arranged non-coplanarly, so that when the U-shaped frame 3 drives the finished joint to move downward, it will not be blocked;

[0078] Furthermore, the inner bottom end face of the U-shaped frame 3 is inclined. Rear baffles 12 and front baffles 13 are respectively fixedly arranged at both ends of the inner side of the U-shaped frame 3. A notch facing the front baffle 13 is provided in the middle of the rear baffle 12. An arc convex 14 is fixedly arranged in the middle of the inner bottom end face of the U-shaped frame 3. The height of the rear baffle 12 is lower than that of the front baffle 13. The front baffle 13 is used to block the finished joint that yaws and falls from the swing frame 42, so that the dialed and fallen finished joint can smoothly fall into the area between the rear baffle 12 and the front baffle 13. Under the action of the arc convex 14, it slides to one side of the arc convex 14, and then automatically rolls away from the U-shaped frame 3 along the inclined plane on the inner side of the U-shaped frame 3.

[0079] It should be noted that during the process of discharging the injection-molded target joint, when the two mold core columns 10 are separated by the rotation of the first gear 54 until they are exactly completely separated from the inner cavity of the joint (that is, the end face of the corresponding end cover 11, 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 are vertically coplanar), the first gear 54 and the corresponding first toothed plate 51 are exactly disengaged from the meshing state. At this time, the end of the swing frame 42 provided with the through groove 44 just contacts the bottom end face of the U-shaped frame 3. As the U-shaped frame 3 continues to move downward, it will press down the swing frame 42, causing the swing frame 42 to yaw with the connection fulcrum with the bracket 41 as the central axis, and using the yawed swing frame 42 to squeeze the annular arc block 46 downward, so that the first spring 47 is compressed. The end of the swing frame 42 provided with the first through slot 43 will approach the target joint during the yawing process of the swing frame 42, contact the surface of the joint, and then dial the target joint out of the area between the two ring frames 63, fall into the inner side of the U-shaped frame 3, and finally be discharged.

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

[0081] A preparation process for acid and alkali resistant CPVC pipe joints, which is used to produce acid and alkali resistant CPVC pipe joints, specifically includes the following operation steps:

[0082] S1. Raw material plasticization: Place the raw materials for producing pipe joints inside the extruder 2 for plasticizing and extrusion.

[0083] S2. Mold closing: Use the first cylinder 52 to push the U-shaped frame 3 upward, so that the two mold core columns 10 approach each other under the meshing action of the corresponding first gear 54 and the first toothed plate 51. At the same time, use the trapezoidal plate 56 to guide and limit the L-shaped plate 55, so that the two outer mold shells 9 approach each other to complete mold closing.

[0084] S3. Injection molding: After completing mold closing, the first cylinder 52 continues to push the U-shaped frame 3 upward, and during the upward movement, use the closed mold to push out the feeding control mechanism 7, so that the plasticized molten material enters the cavity of the mold for molding.

[0085] S4. Thread tapping: After the injection is completed, use the first cylinder 52 to drive the U-shaped frame 3 downward, block the head from continuing to discharge material, and let the material in the mold cool and solidify. Then control the thread tapping mechanism 8 to push out the tool head 813, and continue to drive the U-shaped frame 3 downward, so that the two outer mold shells 9 separate under the action of the corresponding second springs 62. At the same time, complete the thread tapping treatment on the inner side of the formed joint.

[0086] S5. Unloading: After completing thread tapping, the first gear 54 and the corresponding first toothed plate 51 just get out of the meshing state, and use the first cylinder 52 to continue to drive the U-shaped frame 3 downward, so that the downward moving U-shaped frame 3 squeezes the lower end of the swing frame 42, so that the lower end of the swing frame 42 that follows and swings pushes the finished joint out of the area between the two ring frames 63.

[0087] The above shows and describes 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 by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. An acid and alkali resistant CPVC pipe joint preparation device, comprising a frame (1) and an extruder (2) fixedly installed on the top of the frame (1), characterized in that, The frame (1) is composed of a top plate, a bottom plate, and columns fixedly connecting the top plate and the bottom plate. The head of the extruder (2) movably penetrates through the top plate, and an injection molding part is arranged between the top plate and the bottom plate. The injection molding part includes a U-shaped frame (3), two outer mold shells (9), and two mold core columns (10). End caps (11) are threadedly connected to opposite ends of the two mold core columns (10). External threads are tapped on the outer sides of the opposite ends of the two mold core columns (10), and the two mold core columns (10) are respectively installed through threads at both ends of the U-shaped frame (3). The two outer mold shells (9) are respectively movably sleeved on the outer sides of the corresponding mold core columns (10). Semi-circular holes are respectively penetrated and opened at the tops of the opposite ends of the two outer mold shells (9). A mold opening and closing control mechanism (5) for driving the U-shaped frame (3) to lift to complete mold opening and closing is installed between the top plate and the bottom plate. A guiding mechanism (6) for guiding and limiting the outer mold shell (9) is arranged between both sides of the inner cavity of the U-shaped frame (3) and the corresponding outer mold shell (9).

2. The preparation equipment for an acid and alkali resistant CPVC pipe joint according to claim 1, characterized in that, The guiding mechanism (6) includes a plurality of cross bars (61) fixedly installed in a ring shape on the inner side of the U-shaped frame (3). One end of the cross bar (61) movably penetrates through the corresponding outer mold shell (9), and a ring frame (63) is fixedly connected to the end of the cross bar (61) extending into the corresponding outer mold shell (9). The ring frame (63) is movably sleeved on the outer side of the corresponding mold core column (10). The outer mold shell (9) is movably sleeved on the outer side of the corresponding ring frame (63). A second spring (62) fixedly connecting the outer mold shell (9) and the inner wall of the U-shaped frame (3) is sleeved on the outer side of the cross bar (61).

3. A preparation device for an acid and alkali resistant CPVC pipe joint according to claim 1, characterized in that, The mold opening and closing control mechanism (5) includes cross plates (53) fixed at both ends on the outer side of the U-shaped frame (3) and a first cylinder (52) fixed on the top of the bottom plate corresponding to the cross plates (53). The telescopic ends of the two first cylinders (52) are fixedly connected to the corresponding cross plates (53). The mold opening and closing control mechanism (5) further includes a first gear (54) fixedly sleeved on the outer sides of the opposite ends of the two mold core columns (10) and two first toothed plates (51) fixed on the top of the bottom plate. The two first toothed plates (51) are symmetrically arranged about the vertical center line of the U-shaped frame (3), and the two first toothed plates (51) are respectively meshed with the corresponding first gears (54). Two L-shaped plates (55) are respectively fixed on the outer sides of the two outer mold shells (9). Trapezoidal plates (56) are respectively fixed at the positions corresponding to each L-shaped plate (55) at the bottom of the top plate. The top surfaces of each L-shaped plate (55) are set as inclined surfaces parallel to the inclined surfaces on the corresponding trapezoidal plates (56).

4. The preparation equipment for an acid and alkali resistant CPVC pipe joint according to claim 1, characterized in that, Thread tapping mechanisms (8) for tapping the inner walls of the formed joints are arranged inside the two mold core columns (10). The thread tapping mechanism (8) includes a seat block (81) and a sliding seat (83) fixed on the inner side of the mold core column (10). A second cylinder (82) is fixedly installed on one side of the seat block (81). A pushing block (84) is slidably installed on the top of the sliding seat (83). The telescopic end of the second cylinder (82) is fixedly connected to one end of the pushing block (84). The tapping mechanism (8) also includes a horizontal bar (85) fixed on the inner side of the mold core column (10), an I-shaped column (86) movably penetrates the middle part of the horizontal bar (85), an upper cushion seat and a lower cushion seat are fixedly provided at the top and bottom ends of the I-shaped column (86), a trapezoidal block (87) that fits with the corresponding end of the push block (84) is fixedly provided at the bottom of the lower cushion seat, a knife seat (88) is detachably mounted on the top of the upper cushion seat by means of a locking bolt, and a knife head (813) is fixedly mounted on the top of the knife seat (88).

5. The preparation equipment for an acid and alkali resistant CPVC pipe joint according to claim 4, characterized in that, An opening and closing assembly is provided at the position of the corresponding cutter head (813) inside the two mold core columns (10), and the opening and closing assembly includes a notch (15) opened at the top of the mold core column (10) and directly opposite to the corresponding cutter head (813) and two supporting inclined plates (89) fixed at the top of the horizontal bar (85), and a square frame (810) is fixed between the top ends of the two supporting inclined plates (89); The middle of both sides of the square frame (810) are both rotatably installed with a rotating shaft (811), and the outer sides of the two rotating shafts (811) located outside the square frame (810) are fixedly sleeved with a second gear (812), and the top of the upper cushion seat is fixed with two second tooth plates (815) respectively meshing with the corresponding second gear (812), and the two second tooth plates (815) are centrally symmetrically arranged with respect to the vertical center line of the square frame (810); The outer sides of the ends of the two rotating shafts (811) located outside the square frame (810) are fixedly connected with L-shaped bars (814), one ends of the two L-shaped bars (814) are fixedly connected with arc plates (816), and the ends of the two arc plates (816) facing away from each other are provided with two through grooves (817).

6. The preparation equipment for an acid and alkali resistant CPVC pipe joint according to claim 5, characterized in that, A reset assembly is provided between the lower cushion seat and the horizontal bar (85), and the reset assembly includes a through hole (818) vertically penetrating through the top of the horizontal bar (85), a second vertical rod (819) is fixedly provided on the top of the lower cushion seat, the top of the second vertical rod (819) is movably inserted into the corresponding through hole (818), and a fourth spring (820) is sleeved on the outer side of the second vertical rod (819) for fixedly connecting the horizontal bar (85) and the lower cushion seat.

7. A preparation device for an acid and alkali resistant CPVC pipe joint according to claim 1, characterized in that, A discharge control mechanism (7) for controlling the discharge of materials is installed at the end of the die head of the extruder (2), the discharge control mechanism (7) comprising an annular tube (71) fixed inside the die head and a stop arc strip (77) fixed inside the two semicircular holes, a sleeve (72) is movably sleeved inside the annular tube (71), and a material port (73) is penetrated and opened on the outside of the sleeve (72); Two sink grooves (74) are provided on the inner side of the annular tube (71), and two ear plates (75) are fixedly provided on the outer side of the sleeve (72). The two ear plates (75) are respectively slidably connected to the inside of the corresponding sink grooves (74), and a spring three (76) is fixedly connected between the bottom of the ear plate (75) and the bottom end surface of the inner cavity of the corresponding sink groove (74).

8. A preparation device for an acid and alkali resistant CPVC pipe joint according to claim 1, characterized in that, A material unloading mechanism (4) for assisting unloading of the formed joint is installed at one end of the middle portion of the top of the bottom plate, the material unloading mechanism (4) comprises two brackets (41) fixed to the top of the bottom plate, a swing frame (42) is rotatably installed between the two brackets (41), and a through groove (43) is opened in the middle portion of one end of the swing frame (42); One end of the swinging frame (42) far from the first through groove (43) is provided with a through groove (44). A first vertical rod (45) fixedly connected to the bottom plate is movably inserted into the through groove (44). An annular arc block (46) is movably sleeved on the outer side of the first vertical rod (45). A first spring (47) fixedly connecting the bottom plate and the annular arc block (46) is sleeved on the outer side of the first vertical rod (45).

9. The preparation equipment for an acid and alkali resistant CPVC pipe joint according to claim 1, characterized in that, The inner bottom end surface of the U-shaped frame (3) is inclined. Rear baffles (12) and front baffles (13) are respectively fixedly arranged at both ends of the inner side of the U-shaped frame (3). A notch facing the front baffle (13) is formed in the middle of the rear baffle (12). An arc convex (14) is fixedly arranged in the middle of the inner bottom end surface of the U-shaped frame (3).

10. A preparation process for an acid and alkali resistant CPVC pipe joint, which uses the acid and alkali resistant CPVC pipe joint preparation equipment described in any one of claims 1-9 to produce an acid and alkali resistant CPVC pipe joint, characterized in that, Specifically, it includes the following operation steps: S1. Raw material plasticization: The raw materials for producing the pipeline joint are placed inside the extruder (2) for plasticizing and extruding. S2. Mold closing: Use the first air cylinder (52) to push the U-shaped frame (3) upward, so that the two mold core columns (10) approach each other under the meshing action of the corresponding first gear (54) and the first toothed plate (51). At the same time, use the trapezoidal plate (56) to guide and limit the L-shaped plate (55), so that the two outer mold shells (9) approach each other to complete mold closing. S3. Injection molding: After mold closing, the first air cylinder (52) continues to push the U-shaped frame (3) upward, and in the process of rising, use the closed mold to push out the discharge control mechanism (7), so that the plasticized molten material enters the cavity of the mold for molding. S4. Thread tapping: After the injection is completed, use the first air cylinder (52) to drive the U-shaped frame (3) downward, block the head from continuing to discharge, and let the material in the mold cool and solidify. Then control the thread tapping mechanism (8) to push out the tool head (813), and continue to drive the U-shaped frame (3) downward, so that the two outer mold shells (9) are separated under the action of the corresponding second springs (62). At the same time, complete the thread tapping treatment on the inner side of the formed joint. S5. Unloading: After thread tapping, the first gear (54) and the corresponding first toothed plate (51) are just disengaged from the meshing state, and use the first air cylinder (52) to continue to drive the U-shaped frame (3) downward, so that the downward U-shaped frame (3) squeezes the lower end of the swinging frame (42), so that the lower end of the swinging frame (42) with follow-up deflection pushes the finished joint out of the area between the two ring frames (63).

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