Injection molding device for PVC pipe fitting production

Abstract

The invention discloses an injection molding device for PVC pipe fitting production, and particularly relates to the technical field of injection molding.The injection molding device comprises a base, raw material treatment equipment is fixedly installed on the front portion of the upper end of the base, an injection molding structure is fixedly connected to the rear portion of the upper end of the base, and a control terminal is fixedly connected to the right end of the injection molding structure; a discharging structure communicating with the upper end and the front end of the inner cavity of the base is arranged in the inner cavity of the base. According to the injection molding device for PVC pipe fitting production, the telescopic rod is used for driving the forming and discharging assembly to be close to the injection assembly under limiting of the guide plate and close to the injection assembly, a molten PVC raw material is conveyed into the injection assembly through the raw material treatment equipment, and the raw material is solidified to form a pipe through the action of the injection assembly; and automatic demolding is achieved through cooperation of the forming and discharging assembly and the guide plate, the forming quality and production efficiency of the pipes are improved, precision control is more precise, manual intervention is reduced, and the consistency and stability of products are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to an injection molding device for producing PVC pipe fittings. Background Art

[0002] Injection molding is one of the important processes in plastic processing. It is a process of rapidly injecting plastic melt into the mold cavity under high temperature and high pressure conditions, and then cooling it to form a product of the desired shape. The injection molding process of PVC pipe fittings includes key steps such as raw material preparation, plasticization and injection, pressure holding and cooling. This process has the advantages of high production efficiency, precise dimensions, and strong adaptability, and is widely used in the production of PVC pipe fittings.

[0003] Chinese patent announcement No. CN212920185U discloses an injection molding device for producing plastic pipe fittings, including a base, a fixed frame is arranged on one side above the base, the top of the fixed frame supports a material pipe arranged vertically therewith, the top of the material pipe is connected to a hopper, a first fixed plate fixedly connected to the base is arranged on one side of the fixed frame, a fixed mold is fixedly arranged on the side of the first fixed plate away from the fixed frame; one end of the material pipe close to the first fixed plate passes through the first fixed plate and is connected to the fixed mold, a sliding rod perpendicular to the first fixed plate is fixedly connected to the first fixed plate at positions above and below the fixed mold on the first fixed plate, the end of the sliding rod away from the first fixed plate is fixedly connected to the second fixed plate, sliders are slidably arranged on the two sliding rods, a movable mold is fixedly arranged between the two sliders, and a demolding mechanism for removing the molded plastic pipe fittings is arranged on the side of the movable mold away from the fixed mold.

[0004] In the use of existing injection molding devices, the following defects exist: low demoulding efficiency and poor product consistency, loose mold closure that can easily lead to leakage of molten material, unbalanced air pressure in the cavity that affects the density and uniformity of the pipe, complex demoulding process that can easily damage the pipe, serious material waste and difficulty in ensuring molding accuracy, etc. Summary of the invention

[0005] The main purpose of the present invention is to provide an injection molding device for producing PVC pipe fittings, which can effectively solve the problems of low demoulding efficiency, poor molding accuracy and serious material waste in the existing pipe injection molding device during use.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] An injection molding device for producing PVC pipe fittings comprises a base, a raw material processing device is fixedly installed at the front of the upper end of the base, an injection molding structure is fixedly connected to the rear of the upper end of the base, a control terminal is fixedly connected to the right end of the injection molding structure, and an inner cavity of the base is provided with a discharge structure connected to its upper end and front end.

[0008] Preferably, the injection molding structure includes a shell fixedly connected to the upper end of the base, a guide plate is fixedly connected to the upper end of the base symmetrically on the left and right, a telescopic rod is fixedly installed on the rear part of the upper end of the base through a bracket, the output end of the telescopic rod is fixedly connected to a molding blanking component that is slidably connected to the upper end of the base and the guide plates on both sides, and an injection component connected to the output end of the raw material processing equipment is fixedly installed in the middle part of the upper end of the base.

[0009] Preferably, the discharge structure includes a discharge trough opened at the front end of the base, the top wall of the inner cavity of the discharge trough is provided with a discharge trough connected to the upper end of the base and located between the molding discharge assembly and the outer shell, and a feed conveyor belt is fixedly installed on the inner surface of the discharge trough.

[0010] Preferably, one end of the guide plates on both sides close to each other is provided with a second slide groove slidably connected to the forming blanking component, and the inner surfaces of the two second slide grooves are symmetrically provided with L-shaped guide grooves.

[0011] Preferably, the forming and blanking assembly includes a sliding box that is slidably connected to the inner surfaces of the two slide grooves on both sides, the inner surface of the sliding box is slidably connected to a movable plate fixedly connected to the piston rod at the output end of the telescopic rod, the front end of the sliding box is provided with a plurality of through holes connected to its inner cavity in an array distribution, the front end of the movable plate is fixedly connected with a plurality of center rods corresponding to the positions of the through holes in an array distribution, the rear end of the movable plate is fixedly connected with limiting rods that pass through the rear part of the inner cavity of the sliding box and extend to the rear end of the sliding box in a rectangular distribution, the front end of the sliding box is fixedly connected with anti-overflow rings corresponding to the positions of the through holes, and the upper inner sides of the plurality of anti-overflow rings corresponding to the front end of the sliding box are provided with exhaust components.

[0012] Preferably, the inner surface of the sliding box is symmetrically provided with three slide grooves, and the left and right ends of the movable plate are symmetrically fixed with linkage blocks that are slidably connected to the inner surfaces of the adjacent three slide grooves. The inner surfaces of the two three slide grooves are both provided with linkage components that are slidably connected to the adjacent L-shaped guide grooves.

[0013] Preferably, the exhaust component includes an exhaust pipe opened at the front end of the sliding box and connected to the inner cavity of the sliding box, a fixing ring is fixedly connected to the front end of the inner surface of the exhaust pipe, a compression spring three is fixedly connected to the front end of the fixing ring, a piston block slidingly connected to the inner surface of the exhaust pipe is fixedly connected to the front end of the compression spring three, and a plurality of connecting grooves connected to the inner cavity of the exhaust pipe are distributed in an annular manner in the part of the inner surface of the exhaust pipe located behind the outer surface of the piston block.

[0014] Preferably, the linkage component includes a block slidingly connected to the front inner surface of the third slide groove, and the side of the block away from the movable plate is fixedly connected to a compression spring 2 fixedly connected to the inner wall of the third slide groove, and the end of the block away from the movable plate is symmetrically fixedly connected to a connecting rod up and down, and the two connecting rods both penetrate the inner surface of the third adjacent slide groove and extend to the inner surface of the second slide groove and are fixedly connected to a guide rod slidingly connected to the inner surface of the adjacent L-shaped guide groove. When the guide rod is located at the front side of the L-shaped guide groove, the front end of the block is in contact with the rear end of the linkage block, and when the guide rod is located at the rear side of the L-shaped guide groove, the block is at the side of the linkage block away from the L-shaped guide groove.

[0015] Preferably, the injection assembly includes a fixed box fixedly connected to the upper end of the base, a front end of the fixed box is provided with a dosing pipe connected to the output end of the raw material processing equipment and to the inner cavity of the fixed box, the output side of the dosing pipe is distributed in an array, the front side of the inner surface of the fixed box is distributed in an array and fixedly connected with a plurality of cooling pipes, the inner surfaces of several cooling pipes are fixedly connected with a shaping pipe connected to the output port of the dosing pipe, the inner surface of the output port of the dosing pipe is provided with a slide groove 1, the inner surfaces of several slide grooves 1 are fixedly connected with connecting pipes, and the inner surfaces of several slide grooves 1 are provided with a material cutting component slidably connected to the connecting pipe.

[0016] Preferably, the material cutting component includes a T-shaped block slidably connected to the inner surface of the slide groove and a feeding pipe arranged in an annular manner on the inner surface of the slide groove and connected to the inner cavity of the shaping tube. A plurality of connecting pipes connected to adjacent feeding pipes are arranged in an annular manner on the outer surface of the T-shaped block. The inner surface of the T-shaped block is slidably connected to the outer surface of the connecting pipe and is connected to each other. A compression spring is fixedly connected to the front end of the T-shaped block and the front part of the inner surface of the slide groove. In the initial state, the T-shaped block is located in the inner cavity of the shaping tube and the connecting pipe is staggered with the feeding pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention utilizes a telescopic rod to drive the molding blanking component to approach the injection component under the limit of the guide plate and to be tightly closed with the injection component. The molten PVC raw material is transported into the injection component through the raw material processing equipment, and the molten PVC raw material is solidified to form a pipe through the action of the injection component. The molding blanking component is driven by the telescopic rod to move backward to take the pipe out of the injection component, and automatic demoulding is achieved through the cooperation of the molding blanking component and the guide plate. The demoulded finished pipe enters the discharging trough through the discharging trough and is finally sent out through the feeding conveyor belt, thereby improving the molding quality and production efficiency of the PVC pipe, making the precision control more accurate, reducing manual intervention, and ensuring the consistency and stability of the product.

[0019] 2. The present invention can prevent the molten PVC raw material from entering the shaping tube when the linkage block is not in place by means of the material cutting component arranged in the slide 1, thereby reducing material waste and preventing the accuracy and effect of subsequent injection molding from being affected by the premature entry of materials. Further, the linkage block arranged at the front end of the movable plate cooperates with the shaping tube to form a mold, and at the same time, the anti-overflow ring and the cooling tube are used to ensure that the mold is tightly closed, thereby preventing the leakage of molten PVC and improving the molding accuracy. At the same time, the exhaust component is used to discharge the excess air in the cavity formed by the shaping tube and the linkage block, thereby ensuring the air pressure balance in the cavity, improving the density and uniformity of the pipe, and reducing the generation of bubbles, thereby further improving the overall quality and service life of the PVC pipe.

[0020] 3. The present invention first extends the center rod from the through hole before the closing process of the sliding box and the fixed box through the cooperation of the slide groove three and the linkage block, and then drives the sliding box to move forward along the slide groove two through the movable plate to make it fit with the rear end of the fixed box to ensure the sealing of the sliding box and the fixed box; and after the injection is completed, the linkage block and the linkage component are used to cooperate to drive the sliding box and the movable plate to retract synchronously, and the center rod is used to drive the PVC pipe to separate from the shaping pipe, and then the L-shaped guide groove and the linkage component are used to cooperate to drive the linkage component to reset and separate it from the linkage block, and the sliding box is stopped by the limit of the slide groove two on the sliding box, and then the telescopic rod is used to drive the movable plate to retract the center rod from the through hole, so that the pipe is separated from the surface of the center rod, and automatic demolding is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the injection molding structure of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the discharging structure of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the forming and blanking assembly of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the dispensing pipe of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the injection assembly of the present invention;

[0027] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the local structure at B in the middle;

[0028] Figure 8 For the present invention Figure 4 A schematic diagram of the enlarged local structure at center A;

[0029] Fig. 9 is a schematic cross-sectional structure diagram of a guide plate of the present invention;

[0030] Fig.10 It is a schematic structural diagram of the linkage component of the present invention.

[0031] In the figure: 1, base; 2, injection molding structure; 21, shell; 22, injection assembly; 221, fixed box; 222, batching pipe; 223, cutting component; 2231, T-shaped block; 2232, connecting pipe; 2233, compression spring 1; 2234, feeding pipe; 224, cooling pipe; 225, shaping pipe; 226, connecting pipe; 227, slide 1; 23, guide plate; 231, slide 2; 232, L-shaped guide groove; 24, molding and unloading assembly; 240, linkage component; 2401, guide rod; 2402, stopper; 240 3. Compression spring two; 2404. Connecting rod; 241. Sliding box; 242. Movable plate; 243. Limit rod; 244. Center rod; 245. Linkage block; 246. Slide slot three; 247. Exhaust component; 2471. Exhaust pipe; 2472. Fixed ring; 2473. Compression spring three; 2474. Connecting groove; 2475. Piston block; 248. Through hole; 249. Anti-overflow ring; 25. Telescopic rod; 3. Control terminal; 4. Raw material processing equipment; 5. Discharging structure; 51. Feed chute; 52. Discharging chute; 53. Feed conveyor belt. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] Embodiment 1, as Figure 1 As shown, an injection molding device for producing PVC pipe fittings includes a base 1, a raw material processing device 4 is fixedly installed at the front upper end of the base 1, an injection molding structure 2 is fixedly connected to the rear upper end of the base 1, a control terminal 3 is fixedly connected to the right end of the injection molding structure 2, and an inner cavity of the base 1 is provided with a discharge structure 5 connected with its upper end and front end.

[0034] It should be noted that the control terminal 3 is a conventional control device used to control the start and stop of each electrical device in the device. This structure has been widely used in the prior art. In the present invention, it is only used to realize the function of controlling the operation of the device, and its internal structure, operating principle, wiring, and control method are not described in detail.

[0035] In addition, the above-mentioned raw material processing equipment 4 is a conventional raw material processing and extrusion equipment in the prior art, which is internally provided with a heater, an extrusion screw, a feeder and a processing barrel. PVC particles are fed into the processing barrel through the feeder and transported backward by the action of the extrusion screw. In this process, the heater is used to heat the PVC so that it is converted into a molten state, and is squeezed into the injection molding structure 2 through the output nozzle for injection molding. This structure has been widely used in the prior art. In the present invention, it is only used to realize the function of processing and extruding PVC raw materials, and its internal structure, operating principle, wiring, and control method are not described in detail.

[0036] Further, to realize injection molding of PVC pipe fittings, refer to Figure 2 and Figure 3 The injection molding structure 2 includes a shell 21 fixedly connected to the upper end of the base 1, a guide plate 23 is fixedly connected to the upper end of the base 1 symmetrically, a telescopic rod 25 is fixedly installed at the rear of the upper end of the base 1 through a bracket, and the output end of the telescopic rod 25 is fixedly connected to a molding blanking component 24 that is slidably connected to the upper end of the base 1 and the guide plates 23 on both sides, and an injection component 22 that is connected to the output end of the raw material processing equipment 4 is fixedly installed in the middle of the upper end of the base 1.

[0037] The housing 21 is used to shield the influence of the external environment on the injection molding process. The telescopic rod 25 installed on the rear side is controlled by the control terminal 3, and can drive the molding blanking component 24 to follow the extension and retraction of its piston rod to produce movement, thereby realizing the closing and separation of the molding blanking component 24 and the guide plate 23. The mold required for injection molding can be formed by the cooperation of the molding blanking component 24 and the guide plate 23. The molten PVC raw material is injected into the injection component 22 through the raw material processing equipment 4 to form a PVC pipe in the injection component 22, and after the molding blanking component 24 is separated from the injection component 22, the finished pipe is sent into the discharge structure 5 by the action of the molding blanking component 24.

[0038] Further, to achieve the delivery of finished products, see Figure 3 The discharge structure 5 includes a discharge chute 52 opened at the front end of the base 1. The top wall of the inner cavity of the discharge chute 52 is provided with a discharge chute 51 which is connected to the upper end of the base 1 and is located between the molding discharge assembly 24 and the outer shell 21. A feed conveyor belt 53 is fixedly installed on the inner surface of the discharge chute 52.

[0039] The feed chute 51 is connected to the discharge chute 52. The finished pipes falling off the forming feed chute assembly 24 will fall into the discharge chute 52 through the feed chute 51. The feed conveyor belt 53 installed on the discharge chute 52 is a commonly used conveying equipment that can transport the finished pipes. It is a conventional feeding design.

[0040] During the operation of this embodiment, the telescopic rod 25 is first used to drive the molding and blanking component 24 to approach the injection component 22 under the limit of the guide plate 23 and close the injection component 22 tightly. The molten PVC raw material is transported into the injection component 22 by the raw material processing equipment 4, and the molten PVC raw material is solidified to form a pipe by the action of the injection component 22. The molding and blanking component 24 is driven by the telescopic rod 25 to move backward to take the pipe out of the injection component 22, and automatic demolding is achieved through the cooperation of the molding and blanking component 24 and the guide plate 23. The demolded finished pipe enters the discharge trough 52 through the discharge trough 51 and is finally sent out through the feed conveyor belt 53, thereby improving the molding quality and production efficiency of the PVC pipe, making the precision control more accurate, reducing manual intervention, and ensuring the consistency and stability of the product.

[0041] Embodiment 2. Based on embodiment 1, this embodiment can prevent the molten PVC raw material from entering the shaping tube 225 when the linkage block 245 is not in place through the material cutting component 223 arranged in the slide groove 227, thereby reducing material waste and preventing the accuracy and effect of subsequent injection molding from being affected by the premature entry of materials. Further, the linkage block 245 arranged at the front end of the movable plate 242 cooperates with the shaping tube 225 to form a mold, and at the same time, the overflow prevention ring 249 and the cooling tube 224 are used to ensure that the mold is tightly closed, prevent the leakage of molten PVC, and improve the molding accuracy; at the same time, the exhaust component 247 is used to discharge the excess air in the cavity formed by the shaping tube 225 and the linkage block 245, ensure the air pressure balance in the cavity, improve the density and uniformity of the pipe, reduce the generation of bubbles, and further improve the overall quality and service life of the PVC pipe.

[0042] Specifically, to achieve injection molding of PVC pipes, refer to Figure 4 The forming and blanking component 24 includes a sliding box 241 that is slidably connected to the inner surfaces of the two slide grooves 231 on both sides, and the inner surface of the sliding box 241 is slidably connected to a movable plate 242 fixedly connected to the piston rod at the output end of the telescopic rod 25. The front end of the sliding box 241 is arranged in an array with a plurality of through holes 248 communicating with its inner cavity, and the front end of the movable plate 242 is arranged in an array with a plurality of center rods 244 corresponding to the positions of the through holes 248. The rear end of the movable plate 242 is rectangularly distributed and fixedly connected with a limit rod 243 that passes through the rear part of the inner cavity of the sliding box 241 and extends to the rear end of the sliding box 241. The front end of the sliding box 241 is fixedly connected to an anti-overflow ring 249 at the position corresponding to the through hole 248, and the front end of the sliding box 241 is provided with an exhaust component 247 on the inner upper part corresponding to the plurality of anti-overflow rings 249. The inner surface of the sliding box 241 is symmetrically provided with slide grooves 246, and the left and right ends of the movable plate 242 are symmetrically fixedly connected with linkage blocks 245 that are slidably connected to the inner surfaces of the adjacent slide grooves 246.

[0043] Further, in order to cooperate with the function of the molding blanking component 24 to provide a mold for injection molding, refer to Figure 5 and Figure 6 The injection assembly 22 includes a fixed box 221 fixedly connected to the upper end of the base 1, a dispensing pipe 222 connected to the output end of the raw material processing equipment 4 and to the inner cavity of the fixed box 221 is provided at the front end of the fixed box 221, the output side of the dispensing pipe 222 is distributed in an array, and a plurality of cooling pipes 224 are fixedly connected to the front side of the inner surface of the fixed box 221 in an array. The inner surfaces of the plurality of cooling pipes 224 are fixedly connected to a shaping pipe 225 connected to the output port of the dispensing pipe 222, a slide groove 227 is provided on the inner surface of the output port of the dispensing pipe 222, a plurality of inner surfaces of the slide grooves 227 are fixedly connected to connecting pipes 226, and a plurality of inner surfaces of the slide grooves 227 are provided with a material breaking component 223 slidably connected to the connecting pipe 226.

[0044] The movable plate 242 is acted upon by the telescopic rod 25, and moves synchronously with the extension and retraction of the piston rod of the telescopic rod 25. When the piston rod of the telescopic rod 25 extends, it will first push the movable plate 242 to slide forward in the sliding box 241. At this time, the center rod 244 extends from the through hole 248 until the linkage block 245 contacts the front side wall of the slide groove 3 246. At this time, the linkage block 245 will push the sliding box 241 to slide forward through the slide groove 3 246 until the front end of the sliding box 241 contacts the rear end of the fixed box 221. At this time, the anti-overflow ring The inner surface of 249 fits with the outer surface of the linkage block 245, the front end of the sliding box 241 fits with the rear end of the shaping tube 225 to form a sealed chamber, the front end of the synchronous center rod 244 contacts the cutting component 223 and presses it into the slide groove 227, the cutting component 223 connects the batching pipe 222 with the shaping tube 225, at this time, the molten PVC raw material can enter the shaping tube 225 through the connecting pipe 226, the slide groove 227 and the cutting component 223, and gradually fill the shaping tube 225 to realize injection molding.

[0045] In addition, a heat exchange tube is installed on the inner side of the cooling tube 224 sleeved on the outer surface of the shaping tube 225, and a cooling medium is introduced into the heat exchange tube and circulates continuously. A cooling medium circulation system and a heat dissipation system are also installed in the fixed box 221, which can cool the molten PVC raw material in the shaping tube 225 to promote its solidification. This method of processing the molten PVC raw material belongs to the conventional technical means in the prior art. In the present invention, conventional process production is followed, and its specific operation method and related equipment and structure are not displayed or elaborated.

[0046] Further, in order to open the material path after the center rod 244 is in place and automatically close the material path after the center rod 244 is separated, refer to Figure 7The material-breaking component 223 includes a T-shaped block 2231 slidably connected to the inner surface of the slide groove 227 and a feeding pipe 2234 arranged in an annular manner on the inner surface of the slide groove 227 and connected to the inner cavity of the shaping tube 225. A plurality of connecting pipes 2232 connected to adjacent feeding pipes 2234 are arranged in an annular manner on the outer surface of the T-shaped block 2231. The inner surface of the T-shaped block 2231 is slidably connected to the outer surface of the connecting pipe 226 and connected to each other. A compression spring 2233 is fixedly connected to the front end of the T-shaped block 2231 and the front part of the inner surface of the slide groove 227.

[0047] In order to avoid material waste and overflow to form waste that affects the accuracy and effect of subsequent injection molding, the T-shaped block 2231 arranged in the chute 227 is located in the inner cavity of the shaping tube 225 in the initial state, and the connecting tube 2232 and the feeding tube 2234 are staggered. At this time, the molten PVC raw material in the batching tube 222 cannot enter the shaping tube 225 through the path of the connecting tube 226, the T-shaped block 2231, the connecting tube 2232, and the feeding tube 2234;

[0048] When the center rod 244 contacts the front side wall of the inner cavity of the fixed box 221, the cooling pipe 224 will press the T-block 2231 into the slide groove 227. At this time, the connecting pipe 2232 is connected with the feeding pipe 2234. The molten PVC raw material in the batching pipe 222 can enter the T-block 2231 through the connecting pipe 226, and is evenly distributed to each feeding pipe 2234 through the connecting pipe 2232, and finally enters the inner cavity of the shaping tube 225 through the feeding pipe 2234, gradually filling the cavity formed by the shaping tube 225 and the center rod 244.

[0049] Furthermore, in order to exhaust during the injection process and avoid gaps in the finished pipe, refer to Figure 8 The exhaust component 247 includes an exhaust pipe 2471 opened at the front end of the sliding box 241 and connected to the inner cavity of the sliding box 241, a fixing ring 2472 is fixedly connected to the front end of the inner surface of the exhaust pipe 2471, a compression spring three 2473 is fixedly connected to the front end of the fixing ring 2472, a piston block 2475 which is slidably connected to the inner surface of the exhaust pipe 2471 is fixedly connected to the front end of the compression spring three 2473, and a plurality of connecting grooves 2474 which are connected to the inner cavity of the exhaust pipe 2471 are distributed in an annular manner in a part of the inner surface of the exhaust pipe 2471 located at the rear of the outer surface of the piston block 2475.

[0050] Since the shaping tube 225 is sealed, when the cutting component 223 transports the molten PVC raw material inward, the internal pressure will increase. If no exhaust is performed, the molten PVC raw material cannot fill the space in the shaping tube 225, which will cause bubbles or defects in the finished pipe fittings. When the internal pressure of the shaping tube 225 is too high and exceeds the critical bearing point of the compression spring three 2473, the piston block 2475 will push the compression spring three 2473 due to the pressure to compress it. The piston block 2475 slides in the exhaust pipe 2471 and connects the exhaust pipes 2471 on the front and rear sides of the piston block 2475 through the connecting groove 2474, and the air is discharged into the inner side of the sliding box 241. The inner cavity of the sliding box 241 is not sealed, and the air can be discharged freely. When the internal pressure of the shaping tube 225 is reduced, the piston block 2475 will reset under the action of the compression spring three 2473, so that the inner cavity of the shaping tube 225 is sealed and the molten PVC raw material is prevented from overflowing.

[0051] Embodiment 3: Based on the embodiment 2, the embodiment further extends the center rod 244 from the through hole 248 before the sliding box 241 and the fixed box 221 are closed by the cooperation of the sliding groove 3 246 and the linkage block 245, and then drives the sliding box 241 to move forward along the sliding groove 231 through the movable plate 242 so that it fits with the rear end of the fixed box 221 to ensure the sealing of the sliding box 241 and the fixed box 221; and after the injection is completed, the sliding box 241 is driven by the cooperation of the linkage block 245 and the linkage component 240. 1 is retracted synchronously with the movable plate 242, and the central rod 244 is used to drive the PVC pipe to separate from the shaping pipe 225, and then the L-shaped guide groove 232 is used to cooperate with the linkage component 240 to drive the linkage component 240 to reset and separate it from the linkage block 245, and the sliding box 241 is limited by the second slide groove 231 to stop the sliding box 241 from moving, and then the telescopic rod 25 drives the movable plate 242 to retract the central rod 244 from the through hole 248, so that the pipe is separated from the surface of the central rod 244, and automatic demoulding is achieved.

[0052] Specifically, to achieve the alternating movement of the sliding box 241 and the movable plate 242, refer to Fig. 9 and Fig.10The inner surfaces of the two slide grooves 246 are both provided with linkage components 240 that are slidably connected to the adjacent L-shaped guide grooves 232; the linkage components 240 include a stopper 2402 that is slidably connected to the front portion of the inner surface of the slide groove 246, and the side of the stopper 2402 away from the movable plate 242 is fixedly connected to a compression spring 2403 that is fixedly connected to the inner wall of the slide groove 246, and the end of the stopper 2402 away from the movable plate 242 is symmetrically fixedly connected to a connecting rod 2404, and the two connecting rods 2404 both penetrate the adjacent slide grooves. The inner surface of the third guide groove 246 extends to the inner surface of the second guide groove 231 and is fixedly connected with a guide rod 2401 that is slidably connected to the inner surface of the adjacent L-shaped guide groove 232. When the guide rod 2401 is located at the front side of the L-shaped guide groove 232, the front end of the stopper 2402 fits with the rear end of the linkage block 245. When the guide rod 2401 is located at the rear side of the L-shaped guide groove 232, the stopper 2402 is located at the side of the linkage block 245 away from the L-shaped guide groove 232. The L-shaped guide groove 232 is divided into a longitudinal part parallel to the front-rear axis and an inclined part.

[0053] In order to realize that the movable plate 242 drives the movable plate 242 to separate the material and send it into the discharge chute 52 through the discharge chute 51, refer to Fig. 9 and Fig.10 The ends of the guide plates 23 on both sides close to each other are each provided with a second slide groove 231 slidably connected to the forming blanking assembly 24, and the inner surfaces of the two second slide grooves 231 are each symmetrically provided with an L-shaped guide groove 232.

[0054] When the guide rod 2401 is in the longitudinal part of the L-shaped guide groove 232, the distance between the guide rod 2401 and the outer surface of the sliding box 241 is the shortest. At this time, the stopper 2402 is located within the range of the linkage block 245. At this time, the linkage block 245 is located in front of the sliding groove 3 246. That is to say, in this state, when the linkage block 245 moves backward with the movable plate 242, it will contact with the stopper 2402 and drive the sliding box 241 to move backward through the stopper 2402.

[0055] When the guide rod 2401 moves to the inclined part of the L-shaped guide groove 232, it will gradually move away from the outer surface of the sliding box 241 following the path change of the L-shaped guide groove 232. At this time, the stopper 2402 gradually slides in the direction away from the movable plate 242 in the slide groove three 246 and finally separates from the linkage block 245. At this time, the linkage block 245 can no longer continue to drive the sliding box 241 to move through the stopper 2402, but slides backward in the slide groove three 246 and the sliding box 241, thereby retracting the center rod 244 into the sliding box 241 through the through hole 248.

[0056] In summary, when the movable plate 242 drives the sliding box 241 to move forward through the linkage block 245, the linkage block 245 is located in front of the slide slot 3 246, and when the guide rod 2401 moves to the longitudinal portion of the L-shaped guide slot 232, the stopper 2402 approaches the movable plate 242, and at this time, the stopper 2402 is located at the rear of the linkage block 245;

[0057] When the telescopic rod 25 drives the movable plate 242 to move backward, the linkage block 245 drives the sliding box 241 to move backward through the stopper 2402. At this time, the guide rod 2401 slides in the longitudinal part of the L-shaped guide groove 232 until the guide rod 2401 enters the inclined part of the L-shaped guide groove 232 and follows the continuous backward movement of the sliding box 241 to enter the end of the inclined part. At this time, the stopper 2402 separates from the linkage block 245, the sliding box 241 stops moving, and the sliding box 241 is limited by the second slide groove 231.

[0058] At this time, the telescopic rod 25 pulls the movable plate 242 to continue to move backward. After losing the limit of the block 2402, the movable plate 242 will slide backward in the sliding box 241. At this time, the center rod 244 will gradually enter the sliding box 241 through the through hole 248. However, due to the obstruction of the sliding box 241, the PVC pipe sleeved on the outer surface of the center rod 244 cannot continue to move with the center rod 244, and finally the pipe and the center rod 244 are completely separated, ensuring the smooth completion of the demolding process.

[0059] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An injection molding device for producing PVC pipe fittings, comprising a base (1), wherein a raw material processing device (4) is fixedly mounted on the front upper end of the base (1), characterized in that: The rear portion of the upper end of the base (1) is fixedly connected to an injection molding structure (2), the right end of the injection molding structure (2) is fixedly connected to a control terminal (3), and the inner cavity of the base (1) is provided with a discharge structure (5) connected to its upper end and front end.

2. The injection molding device for producing PVC pipe fittings according to claim 1, characterized in that: The injection molding structure (2) comprises a housing (21) fixedly connected to the upper end of the base (1); a guide plate (23) is fixedly connected to the upper end of the base (1) in a symmetrical manner; a telescopic rod (25) is fixedly mounted on the rear portion of the upper end of the base (1) via a bracket; the output end of the telescopic rod (25) is fixedly connected to a molding blanking assembly (24) slidably connected to the upper end of the base (1) and the guide plates (23) on both sides; and an injection assembly (22) connected to the output end of a raw material processing device (4) is fixedly mounted in the middle portion of the upper end of the base (1).

3. The injection molding device for producing PVC pipe fittings according to claim 2, characterized in that: The discharge structure (5) comprises a discharge trough (52) opened at the front end of the base (1); the top wall of the inner cavity of the discharge trough (52) is provided with a discharge trough (51) which is connected to the upper end of the base (1) and is located between the molding discharge assembly (24) and the outer shell (21); and a feeding conveyor belt (53) is fixedly installed on the inner surface of the discharge trough (52).

4. The injection molding device for producing PVC pipe fittings according to claim 2, characterized in that: The guide plates (23) on both sides are provided with a second slide groove (231) slidably connected to the forming blanking assembly (24) at one end close to each other, and the inner surfaces of the two second slide grooves (231) are symmetrically provided with L-shaped guide grooves (232) up and down.

5. The injection molding device for producing PVC pipe fittings according to claim 4, characterized in that: The molding blanking component (24) comprises a sliding box (241) slidably connected to the inner surfaces of the two slide grooves (231) on both sides; the inner surface of the sliding box (241) is slidably connected to a movable plate (242) fixedly connected to the piston rod at the output end of the telescopic rod (25); a front end of the sliding box (241) is provided with a plurality of through holes (248) in array distribution and connected to its inner cavity; a front end of the movable plate (242) is fixedly connected to a plurality of center rods (244) corresponding to the positions of the through holes (248); a rear end of the movable plate (242) is fixedly connected to a limiting rod (243) in a rectangular distribution and extending from the rear end of the sliding box (241) through the inner cavity of the sliding box (241); the front end of the sliding box (241) is fixedly connected to an anti-overflow ring (249) at a position corresponding to the through hole (248); and the upper inner side of the plurality of anti-overflow rings (249) corresponding to the front end of the sliding box (241) is provided with an exhaust component (247).

6. The injection molding device for producing PVC pipe fittings according to claim 5, characterized in that: The inner surface of the sliding box (241) is symmetrically provided with sliding grooves (246) on the left and right sides, and the left and right ends of the movable plate (242) are symmetrically fixedly connected with linkage blocks (245) that are slidably connected to the inner surfaces of adjacent sliding grooves (246), and the inner surfaces of the two sliding grooves (246) are both provided with linkage components (240) that are slidably connected to the adjacent L-shaped guide grooves (232).

7. The injection molding device for producing PVC pipe fittings according to claim 5, characterized in that: The exhaust component (247) includes an exhaust pipe (2471) opened at the front end of the sliding box (241) and connected to the inner cavity of the sliding box (241); a fixing ring (2472) is fixedly connected to the front end of the inner surface of the exhaust pipe (2471); a compression spring three (2473) is fixedly connected to the front end of the fixing ring (2472); a piston block (2475) is fixedly connected to the inner surface of the exhaust pipe (2471) at the front end of the compression spring three (2473); a plurality of connecting grooves (2474) connected to the inner cavity of the exhaust pipe (2471) are distributed in an annular manner on the inner surface of the exhaust pipe (2471) located at the rear of the outer surface of the piston block (2475).

8. The injection molding device for producing PVC pipe fittings according to claim 6, characterized in that: The linkage component (240) includes a stopper (2402) slidably connected to the front portion of the inner surface of the third slide groove (246); a compression spring (2403) fixedly connected to the inner wall of the third slide groove (246) is fixedly connected to the side of the stopper (2402) away from the movable plate (242); a connecting rod (2404) is symmetrically fixedly connected to the end of the stopper (2402) away from the movable plate (242) in an upper and lower manner; the two connecting rods (2404) both penetrate the adjacent third slide grooves (246). The inner surface extends to the inner surface of the second slide groove (231) and is fixedly connected to a guide rod (2401) that is slidably connected to the inner surface of the adjacent L-shaped guide groove (232); when the guide rod (2401) is located at the front side of the L-shaped guide groove (232), the front end of the stop block (2402) is in contact with the rear end of the linkage block (245); when the guide rod (2401) is located at the rear side of the L-shaped guide groove (232), the stop block (2402) is located at a side of the linkage block (245) away from the L-shaped guide groove (232).

9. The injection molding device for producing PVC pipe fittings according to claim 2, characterized in that: The injection assembly (22) comprises a fixed box (221) fixedly connected to the upper end of the base (1); a dispensing pipe (222) connected to the output end of the raw material processing equipment (4) and connected to the inner cavity of the fixed box (221) is provided at the front end of the fixed box (221); the dispensing pipe (222) is arranged on the output side in an array; a plurality of cooling pipes (224) are fixedly connected to the front side of the inner surface of the fixed box (221) in an array; the inner surfaces of the plurality of cooling pipes (224) are fixedly connected to a shaping pipe (225) connected to the output port of the dispensing pipe (222); a slide groove (227) is provided on the inner surface of the output port of the dispensing pipe (222); a plurality of connecting pipes (226) are fixedly connected to the inner surfaces of the plurality of connecting pipes (226); and a plurality of material breaking components (223) slidably connected to the connecting pipe (226) are provided on the inner surfaces of the plurality of connecting pipes (226).

10. The injection molding device for producing PVC pipe fittings according to claim 9, characterized in that: The material breaking component (223) comprises a T-shaped block (2231) slidably connected to the inner surface of the slide groove (227) and a feeding pipe (2234) arranged in an annular manner on the inner surface of the slide groove (227) and connected to the inner cavity of the shaping tube (225); a plurality of connecting pipes (2232) connected to adjacent feeding pipes (2234) are arranged in an annular manner on the outer surface of the T-shaped block (2231); the inner surface of the T-shaped block (2231) is slidably connected to the outer surface of the connecting pipe (226) and connected to each other; a compression spring (2233) is fixedly connected to the front end of the T-shaped block (2231) and the front part of the inner surface of the slide groove (227); in an initial state, the T-shaped block (2231) is located in the inner cavity of the shaping tube (225) and the connecting pipe (2232) is staggered from the feeding pipe (2234).

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